JP2018194567A - Light-emitting device, display device and method for controlling light-emitting device - Google Patents

Abstract

To provide such technology that can vary an emission state of a light-emitting device by suppressing unintentional color change, generation of color unevenness or the like in a light-emitting surface with a small amount of computation.SOLUTION: A light-emitting device of the present invention includes: a plurality of light source parts respectively corresponding to a plurality of light-emitting regions on a light-emitting surface and each including a plurality of light-emitting elements having different emission colors from one another; first determination means for determining a plurality of first emission states respectively corresponding to the plurality of light source parts, as a first emission state corresponding to a common emission level among the plurality of light-emitting elements by a predetermined method; second determination means for determining a plurality of second emission states respectively corresponding the plurality of light source parts, based on the plurality of first emission states, as a second emission state corresponding to a combination of the plurality of emission levels corresponding to the plurality of light-emitting elements; and control means for controlling each emission state of the plurality of light source parts depending on the plurality of second emission states.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a light emitting device, a display device, and a method for controlling the light emitting device.

  As a backlight unit of a liquid crystal display device, there is a light emitting device including a plurality of light source units that can individually control the light emission state. The plurality of light source units respectively correspond to a plurality of regions (partial light emitting regions) on the light emitting surface of the light emitting device, and correspond to a plurality of regions (partial screen regions) on the screen of the display device. As a technique related to such a light emitting device, for each of a plurality of partial screen areas, the light emission state (light emission level) of the light source unit corresponding to the partial screen area according to the luminance of the input image data of the part corresponding to the partial screen area. There is a technology for controlling the emission luminance). Such control is called “local dimming”. According to local dimming, the contrast of an image (display image) displayed on the screen of the display device can be improved.

  In the light-emitting device described above, each light source unit may include a plurality of light-emitting elements having different emission colors. For example, each light source unit may include three LEDs (light emitting diodes) of a red LED, a green LED, and a blue LED as a plurality of light emitting elements. In this case, unintended color change, unintended color unevenness, and the like may occur on the light emitting surface and the display image due to local dimming. In local dimming, the light emission pattern (light emission state of each light source unit) of the light emitting device changes depending on the image pattern of input image data (distribution of pixel values in the screen). As a result, for example, depending on the change in the light emission pattern, the light emitting surface color (light emitting surface color; from the light emitting device) with respect to the display position of the pixel corresponding to white (pixel whose input image data pixel value is a white pixel value). The color of the emitted light) changes. Thereby, the display color (screen color) of the pixel corresponding to white changes. Specifically, there is a difference in light emitting surface color with respect to the portion corresponding to white between the case where the entire screen corresponds to white and the case where the central portion of the screen corresponds to white and the other portions correspond to black. Arise. As a result, a difference in the display color of the portion corresponding to white occurs between the above two cases.

  In general, the light diffusion characteristics of the light emitting elements are different among the plurality of light emitting elements included in the light source unit. The light diffusion characteristic is a characteristic indicating a correspondence relationship between a diffusion distance from the light emitting element (a distance in a direction parallel to the light emitting surface and the screen) and intensity (luminance) of light emitted from the light emitting element. Therefore, depending on the diffusion distance, the color component ratio (the ratio of the intensity of light emitted from the light emitting elements among the plurality of light emitting elements) changes. For example, the ratio of the intensity of red light emitted from a red LED, the intensity of green light emitted from a green LED, and the intensity of blue light emitted from a blue LED varies depending on the diffusion distance.

  The above-described phenomenon (unintentional color change, unintentional color unevenness, etc.) occurs when the color component ratio changes depending on the diffusion distance. For example, when the entire screen corresponds to white, all the light sources are turned on, and thus the light emitting surface color and display color are determined by the combined light obtained by combining the light emitted from the plurality of light sources. On the other hand, when the center portion of the screen corresponds to white and the other portions correspond to black, only the light source portion corresponding to the center portion of the screen is lit, so the light source portion corresponding to the center portion of the screen The light emitting surface color and the display color are determined by the emitted light. The color component ratio changes depending on the diffusion distance. Therefore, between the two cases described above, a light emitting surface color difference occurs with respect to a portion corresponding to white, and a display color difference between portions corresponding to white occurs.

In order to achieve both the improvement of contrast by local dimming and high-precision color reproduction, it is necessary to suppress the occurrence of the above-described phenomena (unintended color change, unintended color unevenness, etc.). Methods for suppressing the occurrence of the above-described phenomenon are disclosed in Patent Documents 1 and 2, for example.

  Patent Document 1 describes a method of correcting image data so that unintended color change, unintended color unevenness, and the like are suppressed. However, this method requires a large amount of computation because each pixel needs to be corrected. The amount of calculation increases due to the increase in the resolution of the image data. In particular, when correcting high-resolution image data called “4K”, “8K”, etc., the amount of calculation becomes enormous. In order to complete a process with a large amount of calculation in a short time, a large-scale arithmetic circuit is required. In addition, a long processing time is required in order to perform processing with a large amount of calculation with a small-scale arithmetic circuit.

  Further, Patent Document 2 discloses a light emission color of a light source unit corresponding to a target partial light emission region so that occurrence of unintended color change, unintended color unevenness, and the like is suppressed in the target partial light emission region. A method of determining is described. However, in this method, unintended color change, unintended color unevenness, and the like occur in the peripheral partial light-emitting area due to light emitted from the light source unit corresponding to the target partial light-emitting area. In all the partial light emitting regions, in order to suppress the occurrence of unintended color change, unintended color unevenness, etc. with high accuracy, convergence calculation is required, and the amount of calculation may be enormous.

JP-A-2006-133640 JP 2014-71407 A

  An object of the present invention is to provide a technique capable of changing the light emission state of a light emitting device by suppressing the occurrence of unintended color change, color unevenness, etc. on the light emitting surface with a small amount of calculation. And

The first aspect of the present invention is:
A plurality of light source units respectively corresponding to a plurality of light emitting areas of the light emitting surface and each including a plurality of light emitting elements having different emission colors;
First determining means for determining, by a predetermined method, a plurality of first light emitting states respectively corresponding to the plurality of light source units as a first light emitting state corresponding to a common light emitting level among the plurality of light emitting elements. When,
As a second light emitting state corresponding to a combination of a plurality of light emitting levels respectively corresponding to the plurality of light emitting elements, a plurality of second light emitting states respectively corresponding to the plurality of light source units are used as the plurality of first light emitting units. Second determining means for determining based on the state;
Control means for controlling the respective light emission states of the plurality of light source units according to the plurality of second light emission states;
With
The second determining means controls the color of the light emitting area corresponding to the lighting light source unit, which is the light source unit in which the first light emitting state is in the lighting state, so that each light emitting state of the plurality of light source units is in a predetermined lighting state. The light emission level of each of the plurality of light emitting elements of each of the two or more light source units including the lighting light source unit corresponds to the first light emission state so as to be substantially equal to the color in the case where the light is emitted. The light emitting device is characterized in that the plurality of second light emission states are determined by changing from a light emission level.

The second aspect of the present invention is:
A plurality of light source units respectively corresponding to a plurality of light emitting areas of the light emitting surface and each including a plurality of light emitting elements having different emission colors;
First determining means for determining, by a predetermined method, a plurality of first light emitting states respectively corresponding to the plurality of light source units as a first light emitting state corresponding to a common light emitting level among the plurality of light emitting elements. When,
As a second light emitting state corresponding to a combination of a plurality of light emitting levels respectively corresponding to the plurality of light emitting elements, a plurality of second light emitting states respectively corresponding to the plurality of light source units are used as the plurality of first light emitting units. Second determining means for determining based on the state;
Control means for controlling the respective light emission states of the plurality of light source units according to the plurality of second light emission states;
With
The second determination means controls the light emission state of each of the plurality of light source units to the first light emission state in a light emission region corresponding to a lighting light source unit whose first light emission state is a light source unit in a lighting state. The light emission level of each of the plurality of light emitting elements of each of the two or more light source units including the lighting light source unit is set to the first light emitting state so that color unevenness that occurs when the light source is generated is reduced. The light emitting device is characterized in that the plurality of second light emission states are determined by changing from a corresponding light emission level.

The third aspect of the present invention is:
A light emitting device as described above;
Display means for displaying an image by transmitting light emitted from the light emitting device based on input image data;
It is provided with the following.

The fourth aspect of the present invention is:
A method for controlling a light emitting device, comprising: a plurality of light source portions each corresponding to a plurality of light emitting areas of a light emitting surface and each having a plurality of light emitting elements having different emission colors,
Determining a plurality of first light emission states respectively corresponding to the plurality of light source units as a first light emission state corresponding to a light emission level common to the plurality of light emitting elements by a predetermined method;
As a second light emitting state corresponding to a combination of a plurality of light emitting levels respectively corresponding to the plurality of light emitting elements, a plurality of second light emitting states respectively corresponding to the plurality of light source units are used as the plurality of first light emitting units. Determining based on the state;
Controlling the respective light emission states of the plurality of light source units according to the plurality of second light emission states;
Have
The color of the light emitting region corresponding to the lighting light source unit that is the light source unit in which the first light emitting state is in the lighting state is substantially the same as the color when the respective light emitting states of the plurality of light source units are controlled to a predetermined lighting state. By changing the light emission level of each of the plurality of light emitting elements of each of the two or more light source units including the lighting light source unit from the light emission level corresponding to the first light emission state so as to be equal to each other. A method for controlling a light emitting device, wherein the plurality of second light emission states are determined.

According to a fifth aspect of the present invention,
A method for controlling a light emitting device, comprising: a plurality of light source portions each corresponding to a plurality of light emitting areas of a light emitting surface and each having a plurality of light emitting elements having different emission colors,
Determining a plurality of first light emission states respectively corresponding to the plurality of light source units as a first light emission state corresponding to a light emission level common to the plurality of light emitting elements by a predetermined method;
A second corresponding to a combination of a plurality of light emission levels respectively corresponding to the plurality of light emitting elements
Determining a plurality of second light emission states respectively corresponding to the plurality of light source units based on the plurality of first light emission states;
Controlling the respective light emission states of the plurality of light source units according to the plurality of second light emission states;
Have
Color unevenness that occurs when the respective light emission states of the plurality of light source units are controlled to the first light emission state in a light emission region corresponding to a lighting light source unit that is a light source unit in which the first light emission state is a lighting state. The light emission level of at least one of the plurality of light emitting elements of each of the two or more light source units including the lighting light source unit is changed from the light emission level corresponding to the first light emission state. Thus, the light emitting device control method is characterized in that the plurality of second light emission states are determined.

  A sixth aspect of the present invention is a program for causing a computer to execute each step of the above-described light emitting device control method.

  According to the present invention, it is possible to change the light emission state of the light emitting device while suppressing the occurrence of unintended color change, color unevenness, and the like on the light emitting surface with a small amount of calculation.

1 is a block diagram illustrating an example of a functional configuration of a liquid crystal display device according to an embodiment. The schematic diagram which shows an example of the partial screen area | region and light source part which concern on this embodiment Schematic diagram showing an example of intensity distribution according to the present embodiment Schematic diagram showing an example of a conversion coefficient according to the present embodiment Schematic diagram for explaining an example of processing according to the present embodiment Schematic diagram for explaining an example of processing according to the present embodiment Schematic diagram for explaining an example of processing according to the present embodiment

  Hereinafter, embodiments of the present invention will be described. The light emitting device according to this embodiment can be used in a display device including a display panel that displays an image by transmitting light emitted from the light emitting device based on input image data. For example, the light emitting device according to this embodiment can be used as a backlight unit of a liquid crystal display device in which the display panel is a liquid crystal panel. The light-emitting device according to the present embodiment can also be used in a MEMS shutter type display device including a MEMS (Micro Electro Mechanical System) shutter instead of a liquid crystal element. The light emitting device according to the present embodiment can also be used in a display device such as an advertisement sign device or a sign display device. The light emitting device according to the present embodiment can also be used as a lighting device such as a street lamp, indoor lighting, and microscope lighting.

  FIG. 1 is a block diagram showing a functional configuration of the liquid crystal display device according to the present embodiment. The liquid crystal display device according to the present embodiment includes a storage medium 101, a backlight unit 102, a liquid crystal panel unit 103, an image acquisition unit 104, a light emission level determination unit 105, a light emission level conversion unit 106, a backlight control unit 107, and a luminance estimation unit. 108 and an image correction unit 109.

  The storage medium 101 stores image data, various information used in the liquid crystal display device, and the like. As the storage medium 101, a semiconductor memory, a magnetic disk, an optical disk, or the like can be used. The storage medium 101 may be built in the liquid crystal display device or may be detachable from the liquid crystal display device.

The backlight unit 102 includes a plurality of light source units capable of individually controlling light emission states (emission luminance, emission color, etc.), and a diffusion plate that diffuses light emitted from the plurality of light source units and emits light from the light emitting surface. With. The light emitted from the backlight unit 102 (the light emitting surface of the backlight unit 102) is applied to the back surface of the liquid crystal panel unit 103 (liquid crystal panel).

  Each light source unit includes a plurality of light emitting elements having different emission colors. In the present embodiment, the plurality of light emitting elements are three LEDs (light emitting diodes) of a red LED, a green LED, and a blue LED. The backlight unit 102 drives each LED according to the control signal output from the backlight control unit 107.

  In addition, a light emitting element is not restricted to LED. For example, the light emitting element may be a light emitting diode (LED), an organic EL (Electro Luminescence) element, a laser light source, a cold cathode tube, or the like. Further, the light emission color of the light emitting element is not limited to red, green, and blue. The light source unit may not include at least one of a light emitting element whose emission color is red, a light emitting element whose emission color is green, and a light emitting element whose emission color is blue. The light source unit may include a light emitting element whose emission color is different from red, green, and blue. For example, the light source unit may include a light emitting element whose emission color is yellow.

  The plurality of light source units respectively correspond to a plurality of regions (partial light emitting regions) on the light emitting surface of the backlight unit 102 and correspond to a plurality of regions (partial screen regions) on the screen of the liquid crystal display device (liquid crystal panel unit 103). To do. The partial light emitting region corresponding to the light source unit is, for example, a region where light from the light source unit is emitted on the light emitting surface. It can be said that the partial light emitting region corresponding to the light source unit is “a region where light emitted from the light source unit is irradiated on the back surface of the liquid crystal panel unit 103”. And a part of partial light emission area | region overlaps between a light source part and the light source part adjacent to the said light source part. The partial screen area is a partial area of the screen.

  FIG. 2A is a schematic diagram showing a partial screen area according to the present embodiment. As shown in FIG. 2A, in the present embodiment, the plurality of partial screen areas are a plurality of divided areas constituting the entire area of the screen. The plurality of partial screen areas are arranged in a matrix. Specifically, the plurality of partial screen areas are a total of 40 partial screen areas of 8 in the horizontal direction and 5 in the vertical direction. The shape of the partial screen area is a quadrangle.

  FIG. 2B is a schematic diagram illustrating a light source unit according to the present embodiment. As shown in FIG. 2B, in the present embodiment, the plurality of light source units are arranged in a matrix. Specifically, the plurality of light source units are a total of 40 light source units of 8 in the horizontal direction and 5 in the vertical direction. There is a one-to-one correspondence between the partial screen area and the light source unit.

  The partial screen area is not limited to the divided area. The partial screen area may be separated from all other partial screen areas, or at least a part of the partial screen area may overlap at least a part of the other partial screen area. The correspondence between the partial screen area and the light source unit may not be a one-to-one correspondence. For example, two or more light source units may be associated with one partial screen area. The shape of the partial screen area is not limited to a quadrangle. For example, the shape of the partial screen area may be a circle, a triangle, a pentagon, a hexagon, or the like. The number of partial screen areas, the arrangement of partial screen areas, and the like are not particularly limited. For example, more than 40 partial screen areas may be set, or fewer than 40 partial screen areas may be set. A plurality of partial screen areas may be arranged in a staggered pattern. Similarly, the number of light source units, the arrangement of the light source units, and the like are not particularly limited.

3A and 3B are schematic views showing the intensity distribution of light emitted from the backlight unit 102. FIG. The vertical axis in FIGS. 3A and 3B indicates the intensity (luminance) of light emitted from the backlight unit 102. 3A and 3B, the horizontal axis indicates the horizontal position of the light source unit (
Horizontal position). Specifically, the horizontal axis of FIGS. 3A and 3B indicates the horizontal number (column number) of the light source unit. 3A and 3B show the intensity distribution of red light emitted from the red LED, the intensity distribution of green light emitted from the green LED, and the intensity distribution of blue light emitted from the blue LED. ing.

  FIG. 3A shows an intensity distribution when only one light source unit is turned on. Specifically, FIG. 3A shows that only a red LED, a green LED, and a blue LED that are included in one light source unit are turned on at the same (common) light emission level, and the other LEDs are turned off. The intensity distribution is shown. The light emission level corresponds to the light emission luminance (light emission amount) of the LED, and the LED emits light with higher luminance as the light emission level is higher.

  Generally, the light diffusion characteristics of LEDs are different among a plurality of LEDs provided in a light source unit. The light diffusion characteristic is a characteristic indicating a correspondence relationship between a diffusion distance from the LED (a distance in a direction parallel to the light emitting surface and the screen) and the intensity of light emitted from the LED. That is, the diffusion of light emitted from the LEDs is different among the plurality of LEDs provided in the light source unit. Such differences in diffusion (light diffusion characteristics) are caused by differences in the characteristics of the diffusion plate, the characteristics of the LEDs, and the like. Then, due to the diffusion described above, the color component ratio (the ratio of the intensity of light emitted from the LEDs among the plurality of LEDs) changes depending on the diffusion distance.

  In this embodiment, as shown in FIG. 3A, the light diffusion characteristic of the red LED is equal to the light diffusion characteristic of the green LED, and the light diffusion characteristic of the blue LED (light emitting element whose emission color is a predetermined color) Different. Specifically, the diffusion of light emitted from a blue LED is smaller than the diffusion of light emitted from a red LED or a green LED. Therefore, as the diffusion distance increases, the ratio of the intensity of blue light to the intensity of red light or green light decreases. In addition, the light diffusion characteristic of red LED, the light diffusion characteristic of green LED, and the light diffusion characteristic of blue LED are not specifically limited. An LED with low light diffusion need not be a blue LED.

  FIG. 3B shows an intensity distribution when all the light source units are turned on. Specifically, FIG. 3B shows an intensity distribution when all LEDs are lit at the same light emission level (for example, the maximum light emission level). Since the light source unit provided at the end of the backlight unit 102 is less affected by light leaked from the adjacent light source unit, the light source unit emits light with higher luminance than the other light source units. In FIG. 3B, the intensity distribution of light emitted from the backlight unit 102 is the sum of the intensity distributions of light emitted from the respective light source units.

  As described above, the partial light emitting region corresponding to the light source unit is a region where light from the light source unit is emitted on the light emitting surface, and is partially between the light source unit and the light source unit adjacent to the light source unit. Part of the light emitting area overlaps. And the diffusion of the light emitted from the blue LED is different from the diffusion of the light emitted from the red LED or the green LED. Therefore, there is a difference between the color of the partial light emitting area where the light source unit is lit (the color of light emitted from the partial light emitting area) between FIG. 3A and FIG. Specifically, in FIG. 3A, the intensity of blue light is higher than the intensity of red light or green light at the central portion of the partial light emitting area corresponding to the light source unit to be lit, and the other part of the partial light emitting area. The intensity of blue light is lower than that of red light or green light, and color unevenness occurs in the partial light emitting region. On the other hand, in FIG. 3B, color unevenness does not occur in the light emitting surface, and the intensity (total) of red light and green light is higher than the intensity (total) of blue light.

The liquid crystal panel unit 103 includes a liquid crystal panel and a control driver. The liquid crystal panel includes a plurality of liquid crystal elements arranged in a matrix. The control driver controls the transmittance of each liquid crystal element by driving each liquid crystal element. For example, the liquid crystal panel displays an image by transmitting light emitted from the backlight unit 102 based on input image data. Specifically, a control driver controls the transmittance of each liquid crystal element by driving each liquid crystal element based on input image data. As a result, light emitted from the backlight unit 102 is transmitted through the liquid crystal panel with a transmittance based on the input image data. In the present embodiment, the liquid crystal panel transmits light emitted from the backlight unit 102 according to display image data output from the image correction unit 109. Specifically, the control driver drives each liquid crystal element according to display image data (each gradation value of display image data). As a result, light emitted from the backlight unit 102 is transmitted through the liquid crystal panel with a transmittance corresponding to the display image data.

  The image acquisition unit 104 acquires input image data and outputs the input image data to the light emission level determination unit 105 and the image correction unit 109. The image acquisition unit 104 acquires input image data from outside the liquid crystal display device or acquires input image data from the storage medium 101.

  The light emission level determination unit 105 determines a plurality of first light emission states respectively corresponding to the plurality of light source units by a predetermined method, and notifies the light emission level conversion unit 106 of the plurality of first light emission states. The 1st light emission state of a light source part respond | corresponds to the light emission level common among the red LED, green LED, and blue LED with which the said light source part is provided. In the present embodiment, the light emission level determination unit 105 determines the light emission level common among the red LED, the green LED, and the blue LED as the first light emission state. In the present embodiment, the light emission level determination unit 105 is configured so that 1.0 corresponds to the maximum light emission luminance of the LED and 0.0 corresponds to the minimum light emission luminance (light-off state) of the LED. The converted value is determined as the light emission level which is the first light emission state.

  In the present embodiment, the light emission level determination unit 105 determines a plurality of first light emission states based on input image data. Specifically, the light emission level determining unit 105 performs the first light emission for each of the plurality of light source units according to the luminance (luminance feature amount) of the input image data of the portion corresponding to the partial screen area of the light source unit. Determine the state. In the present embodiment, the light emission level determination unit 105 uses the maximum luminance value of the input image data as the luminance feature amount. Further, in the present embodiment, the light emission level determination unit 105 increases the value between the first light emission state (red LED, green LED, and blue LED) as the luminance (luminance feature amount) of the input image data increases. Common light emission level). Specifically, the light emission level determination unit 105 determines a value proportional to the luminance of the input image data as the first light emission state according to the gamma setting (gradation characteristics) of the input image data. For example, the gamma setting of the input image data is ITU BT. In the case of the gamma setting defined in 709, the light emission level determination unit 105 determines a value proportional to a value obtained by multiplying the gradation value of the input image data to the power of 2.2 as the first light emission state.

  Note that the method of determining the first light emission state is not limited to the above method. For example, the light emission level determination unit 105 may use other representative values (average value, minimum value, intermediate value, mode value, etc.) of the luminance of the input image data, a luminance histogram of the input image data, etc. as the luminance feature amount. May be used. The light emission level determination unit 105 may use a representative value of the gradation value of the input image data, a histogram of the gradation value of the input image data, and the like as the luminance feature amount. In addition, the light emission level determination unit 105 uses the liquid crystal display device usage environment (temperature, ambient brightness, etc.), the type of input image data (photograph, illustration, text, video, still image, etc.), user operation, etc. Depending on, the first light emission state of each light source unit may be determined.

The light emission level conversion unit 106 determines a plurality of second light emission states respectively corresponding to the plurality of light source units based on the plurality of first light emission states determined by the light emission level determination unit 105. Then, the light emission level conversion unit 106 notifies the backlight control unit 107 and the luminance estimation unit 108 of the plurality of second light emission states. Notify the light emission level converter 106. The second light emission state of the light source unit corresponds to a combination of three light emission levels respectively corresponding to the red LED, the green LED, and the blue LED included in the light source unit. If the light emission level of the second light emission state is common between the red LED, the green LED, and the blue LED included in the light source unit, it may not be common. In the present embodiment, the light emission level determination unit 105 determines the combination of the three light emission levels as the second light emission state.

In the present embodiment, the light emission level conversion unit 106 sets the light emission levels of the blue LEDs of the two or more light source units including the lighting light source unit so that at least one of the following conditions 1 and 2 is satisfied. It changes from the light emission level corresponding to 1 light emission state. Thereby, a plurality of second light emission states are determined. Note that the light emission level conversion unit 106 changes the light emission level corresponding to the first light emission state to the light emission level corresponding to the second light emission state for the LED whose light emission level is not changed from the light emission level corresponding to the first light emission state. Determine as.

Condition 1: The color of the partial light emitting region corresponding to the lighting light source unit is substantially equal to the color when the light emitting states of the plurality of light source units are controlled to a predetermined lighting state (“abbreviation” includes “complete”). ).
Condition 2: In the partial light emission region corresponding to the lighting light source unit, color unevenness that occurs when the light emission states of the plurality of light source units are controlled to the first light emission state is reduced.

  The lighting light source unit is a light source unit whose first light emission state is in a lighting state, and is a light source unit whose light emission level in the first light emission state is larger than 0.0. The two or more light source units include, for example, a light source unit in which a part of the partial light emitting region overlaps a part of the partial light emitting region of the lighting light source unit in addition to the lighting light source unit. The light source unit in which a part of the partial light emission region overlaps with a part of the partial light emission region of the lighting light source unit is, for example, a light source unit around the lighting light source unit. Hereinafter, in the two or more light emitting units, a light source unit other than the lighting light source unit is referred to as a “peripheral light source unit”. Although the predetermined lighting state in Condition 1 is not particularly limited, in the present embodiment, the predetermined lighting state is the lighting state of FIG.

Condition 1 described above is, for example, one of the following conditions 1-1 to 1-3. In the condition 1-2, the position corresponding to the light emission center of the lighting light source unit in the partial light emission region corresponding to the lighting light source unit is, for example, the center position of the partial light emitting region corresponding to the lighting light source unit. In the condition 1-3, the position where the intensity of light emitted from the lighting light source unit in the partial light emitting region corresponding to the lighting light source unit is the maximum is, for example, the center position of the partial light emitting region corresponding to the lighting light source unit.

Condition 1-1: The color distribution of the partial light emitting region corresponding to the lighting light source unit is substantially equal to the color distribution when the light emitting states of the plurality of light source units are controlled to a predetermined lighting state.
Condition 1-2: When the color of the position corresponding to the light emission center of the lighting light source unit in the partial light emission region corresponding to the lighting light source unit is controlled so that each light emission state of the plurality of light source units is a predetermined lighting state It is almost equal to the color.
Condition 1-3: In the partial light emission region corresponding to the lighting light source unit, the color at the position where the intensity of light emitted from the lighting light source unit is the maximum is controlled so that the respective light emission states of the plurality of light source units are in a predetermined lighting state. The color is almost the same as

In the present embodiment, the light emission level conversion unit 106 changes the light emission level of each blue LED of the lighting light source unit and the peripheral light source unit from the light emission level corresponding to the first light emission state using a predetermined conversion coefficient. . In the present embodiment, 40 numbers of 1 to 40 are assigned to the 40 light source units, respectively. And the light emission level conversion part 106 determines (calculates) the light emission level corresponding to a 2nd light emission state using the following formulas 1-3.

  In Expressions 1 to 3, “I (i)” is the light emission level corresponding to the first light emission state of the light source unit i (the light source unit of number i), and “I (j)” is the light source unit j. The light emission level corresponding to the first light emission state. “Or (j)” is a light emission level corresponding to the second light emission state of the red LED included in the light source unit j. “Og (j)” is a light emission level corresponding to the second light emission state of the green LED included in the light source unit j. “Ob (j)” is a light emission level corresponding to the second light emission state of the blue LED included in the light source unit j. “Kb (j, i)” is a conversion coefficient for converting the light emission level I (i) to the light emission level Ob (j), and corresponds to the numbers i and j.

Note that the light emission level conversion unit 106 may change the variable i in Expression 3 so that all the light source units are selected. The light emission level conversion unit 106 may change the variable i so that only the lighting light source unit and the peripheral light source unit are selected. That is, the light emission level conversion unit 106 may change the variable i so that a light source unit having a conversion coefficient of zero is not selected. Moreover, the determination method of a 2nd light emission state is not restricted to the said method. For example, the light emission level conversion unit 106 may change the light emission level of the red LED and the green LED from the light emission level corresponding to the first light emission state, or change the light emission level of the blue LED to the first light emission state. It is not necessary to change from the corresponding light emission level. Specifically, the light emission level conversion unit 106 may use the following expressions 4 and 5 instead of the expressions 1 and 2. “Kr (j, i)” in Expression 4 is a conversion coefficient for converting the light emission level I (i) to the light emission level Or (j), and corresponds to the numbers i and j. “Kg (j, i)” in Expression 5 is a conversion coefficient for converting the light emission level I (i) to the light emission level Og (j), and corresponds to the numbers i and j. The conversion coefficients kr (j, i) and kg (j, i) are different from the conversion coefficients kb (j, i).

  The backlight control unit 107 controls the light emission states of the plurality of light source units according to the plurality of second light emission states determined by the light emission level conversion unit 106. Specifically, the backlight control unit 107 generates a control signal for each of the plurality of LEDs according to the light emission level corresponding to the second light emission state of the LED. Then, the backlight control unit 107 outputs a control signal for each LED to the backlight unit 102. Thereby, each LED is driven according to the control signal output from the backlight control unit 107. As a result, each LED emits light with a luminance corresponding to the light emission level corresponding to the second light emission state. As control of the light emission luminance of the LED, there are PWM control for controlling the pulse width of the drive signal supplied to the LED, PAM control for controlling the peak value of the drive signal, a combination thereof, and the like. The control signal is a signal indicating, for example, the pulse width of the drive signal, the peak value of the drive signal, and the like.

The luminance estimation unit 108 estimates an irradiation luminance distribution (irradiation luminance distribution) based on the plurality of second light emission states determined by the light emission level conversion unit 106 and notifies the image correction unit 109 of the irradiation luminance distribution. The irradiation luminance is the luminance of light emitted from the backlight unit 102 and irradiated on the back surface of the liquid crystal panel unit 103. The luminance estimation unit 108 estimates an irradiation luminance distribution when the light emission states of the plurality of light source units are controlled to the second light emission state.

  In the present embodiment, the luminance estimation unit 108 reads distribution information regarding the irradiation luminance distribution when each LED is lit alone from the storage medium 101. When an LED is lit alone, only the LED is lit and the other LEDs are turned off. Then, the luminance estimation unit 108 estimates the irradiation luminance distribution when the light emission states of the plurality of light source units are controlled to the second light emission state based on the distribution information and the plurality of second light emission states. To do. Specifically, the LED distribution information indicates the irradiation luminance for each liquid crystal element of the liquid crystal panel unit 103 (liquid crystal element corresponding to the emission color of the LED). For each LED, the luminance estimation unit 108 multiplies each irradiation luminance of the distribution information by the light emission level corresponding to the second light emission state. Thereby, for each LED, an irradiation luminance distribution (partial distribution) when the LED is lit alone at a light emission level corresponding to the second light emission state is estimated. And the brightness | luminance estimation part 108 estimates the sum total of several partial distribution as irradiation brightness distribution in case each light emission state of a several light source part is controlled to a 2nd light emission state.

  In addition, the estimation method of irradiation luminance distribution is not restricted to the said method. For example, the distribution information may be information indicating irradiation luminance for some liquid crystal elements. In this case, for example, the luminance estimation unit 108 estimates the irradiation luminance of other liquid crystal elements by interpolation processing using the irradiation luminance of some liquid crystal elements.

The image correction unit 109 generates display image data by correcting the input image data based on the plurality of second light emission states determined by the light emission level conversion unit 106. Then, the image correction unit 109 outputs the display image data to the liquid crystal panel unit 103. In the present embodiment, the light emission state of each light source unit is individually controlled. Therefore, even with the same gradation value, the display luminance (screen luminance) changes depending on the light emission state of each light source unit. The image correction unit 109 corrects the input image data so that such a change in display luminance is suppressed. In the present embodiment, the image correction unit 109 is based on the irradiation luminance distribution estimated by the luminance estimation unit 108 (irradiation luminance distribution when the respective light emission states of the plurality of light source units are controlled to the second light emission state). The input image data is corrected. Specifically, the image correction unit 109 calculates the gradation value G of the display image data using the following Expression 6. In Equation 6, “F” is the gradation value of the input image data. “L” is the irradiation luminance determined by the light emission level conversion unit 106. “Lp” is the irradiation luminance when the light emission states of the plurality of light source units are controlled to a predetermined lighting state (the lighting state in FIG. 3B). Note that the correction method of the input image data is not particularly limited as long as the above-described change in display luminance is suppressed.

G = F × Lp / L (Expression 6)

  The processing of the light emission level conversion unit 106 will be described in detail. FIG. 4 is a schematic diagram showing the conversion coefficient kb (j, i). In the present embodiment, table data indicating the conversion coefficient kb (j, i) in FIG. 4 is prepared in advance. Instead of the table data, a function indicating the conversion coefficient kb (j, i) may be prepared in advance. In the table data of FIG. 4, the horizontal position (column number) of the light source unit is used as the numbers i and j.

In FIG. 4, the conversion coefficient kb (j, i) corresponding to the number i = j−1, j, j + 1 is larger than zero, and the conversion coefficient kb (j, i) corresponding to another number i is zero. . Therefore, when the light source part j is a lighting light source part, the light source part i arrange | positioned next to the lighting light source part j is used as a peripheral light source part. Specifically, the light source part i arranged next to the lighting light source part j in the horizontal direction is used as the peripheral light source part. The peripheral light source unit is not limited to the light source unit arranged next to the lighting light source unit. For example, a plurality of light source units from the lighting light source unit to n (n is an integer of 2 or more) ahead may be used as the peripheral light source unit.

  In the table data of FIG. 4, the conversion coefficient kb (j, i) is determined so that the total sum of the eight conversion coefficients kb (j, i) corresponding to one number j is 1. Therefore, the light emission of each blue LED of the lighting light source unit and the peripheral light source unit so that the lighting light source unit and the peripheral light source unit compensate for the change in the light emission level of the blue LED by the calculation of Equation 3 using the table data of FIG. The level is changed from the light emission level corresponding to the first light emission state.

  Specifically, since the conversion coefficient kb (j, i) corresponding to the number j and the number i = j is smaller than 1, the light emission level of the blue LED of the lighting light source unit corresponds to the first light emission state. Reduced from emission level. Then, the light emission level of the blue LED of the peripheral light source unit is increased from the light emission level corresponding to the first light emission state so as to compensate for the decrease in the light emission level of the blue LED of the lighting light source unit. That is, the filter process (predetermined filter process) for adjusting the intensity distribution of the light emitted from the blue LED among the plurality of light source units is realized by the calculation of Expression 3 using the table data of FIG.

  As described above, in this embodiment, the diffusion of light emitted from the blue LED is smaller than the diffusion of light emitted from the red LED and the green LED. When only one light source unit is lit, as shown in FIG. 3A, the intensity of blue light is higher than the intensity of red light or green light at the central portion of the partial light emitting region corresponding to the light source unit to be lit. The intensity of blue light is lower than that of red light or green light in other parts of the partial light emitting region. And when all the light source parts light, as shown to FIG. 3 (B), the intensity | strength (total) of red light and green light is higher than the intensity | strength (total) of blue light.

  Therefore, Condition 1 and Condition 2 can be satisfied by the above method of reducing the light emission level of the blue LED of the lighting light source unit and increasing the light emission level of the blue LED of the peripheral light source unit. Specifically, by reducing the light emission level of the blue LED of the lighting light source unit, the color of the central portion of the partial light emitting region corresponding to the lighting light source unit can be brought close to the color of FIG. However, with this alone, the color of the other part of the partial light emitting region corresponding to the lighting light source unit will be away from the color of FIG. In the present embodiment, by increasing the light emission level of the blue LED of the peripheral light source unit, the color of the other part of the partial light emitting region corresponding to the lighting light source unit can be brought close to the color of FIG. As a result, Condition 1 and Condition 2 can be satisfied, and the occurrence of unintended color change, unintended color unevenness, etc. on the light emitting surface and the display image (image displayed on the screen) can be suppressed. . The same effect can be expected by increasing the light emission levels of the red LED and the green LED of the lighting light source unit and reducing the light emission levels of the red LED and the green LED of the peripheral light source unit.

  When the table data in FIG. 4 is used, the second light emission states of the plurality of light source units are determined in consideration of the plurality of light source units arranged in the horizontal direction. Therefore, it is possible to suppress the occurrence of unintended color unevenness in the horizontal direction. In consideration of the plurality of light source units arranged in the vertical direction, the second light emission state of each of the plurality of light source units may be determined. Thereby, the occurrence of unintended color unevenness in the vertical direction can be suppressed. The second light emission state of each light source unit may be determined in consideration of both the plurality of light source units arranged in the horizontal direction and the plurality of light source units arranged in the vertical direction. Thereby, it is possible to suppress both occurrence of unintended color unevenness in the horizontal direction and occurrence of unintended color unevenness in the vertical direction.

A specific example of processing of the light emission level conversion unit 106 will be described with reference to FIGS. 5 (A) to 5 (D), 6 (A) to 6 (D), and 7 (A) to 7 (D). 5 (A), 6 (A), 7 (A)
The light emission level corresponding to the first light emission state is shown. 5B, 6B, and 7B show intensity distributions of light emitted from the backlight unit 102 when the light emission states of the plurality of light source units are controlled to the first light emission state. Indicates. 5C, 6C, and 7C show the light emission levels corresponding to the second light emission state. 5D, 6D, and 7D show intensity distributions of light emitted from the backlight unit 102 when the light emission states of the plurality of light source units are controlled to the second light emission state. Indicates. 5 (B), 6 (B), 7 (B), 5 (D), 6 (D), 7 (D), the blue ratio is the blue light relative to the sum of the intensity of red light and the intensity of green light. Is the ratio of strength. When the blue ratio is uniform within the light emitting surface, it means that color unevenness does not substantially occur within the light emitting surface.

  In FIG. 5A, the light emission level corresponding to the first light emission state is 1.0 in all the light source units. A lighting state in which all light emission levels of the red LED, the green LED, and the blue LED included in the light source unit are 1.0 corresponds to a predetermined lighting state (the lighting state in FIG. 3B). Therefore, when the respective light emission states of the plurality of light source units are controlled to the first light emission state in FIG. 5A, the intensity distribution of the light emitted from the backlight unit 102 is the intensity in FIG. 5B. Distribution.

  In this case, the light emission level of FIG. 5C is obtained as the light emission level corresponding to the second light emission state by the calculations of Equations 1 to 3. Also in FIG. 5C, the light emission level corresponding to the first light emission state is 1.0 in all the LEDs. That is, for all the LEDs, the same light emission level as that of FIG. 5A is obtained as the light emission level corresponding to the second light emission state. Therefore, when the light emission states of the plurality of light source units are controlled to the second light emission state in FIG. 5C, the intensity distribution of the light emitted from the backlight unit 102 is as shown in FIG. The intensity distribution shown in FIG. 5D is equal to the intensity distribution. In FIGS. 5B and 5D, the blue ratio is uniform within the light emitting surface and is about 0.5. Therefore, the blue ratio being about 0.5 means that the color of the light emitting surface is substantially equal to the color corresponding to a predetermined lighting state (lighting state in FIG. 3B).

  In FIG. 6A, the light emission level corresponding to the first light emission state is 1.0 in the light source unit of number 4, and in the light source units of numbers 1, 2, 3, 5, 6, 7, and 8, The light emission level corresponding to the first light emission state is 0.0. Therefore, the light source part number 4 is a lighting light source part. And when each light emission state of a some light source part is controlled to the 1st light emission state of FIG. 6 (A), the intensity distribution of the light emitted from the backlight unit 102 is shown in FIG. 6 (B). Intensity distribution. From FIG. 6B, it can be seen that in the partial light emission region corresponding to the lighting light source unit of No. 4, there is a position where the blue ratio is not uniform and the blue ratio is not about 0.5.

  In this case, the light emission level of FIG. 6C is obtained as the light emission level corresponding to the second light emission state by the calculations of Equations 1 to 3. It can be seen from FIG. 6C that the light emission level of the blue LED included in the number 4 lighting light source unit is reduced from 1.0. Specifically, since the conversion coefficient kb (4, 4) of the table data in FIG. 4 is 0.86, the light emission level of the blue LED provided in the number 4 lighting light source unit is reduced to 0.86. From FIG. 6C, it can also be seen that the light emission level of the blue LED included in the light source portions of Nos. 3 and 5 (the peripheral light source portion of the lighting light source portion of No. 4) is increased from 0.0. Specifically, since the conversion coefficients kb (4, 3) and kb (4, 5) are 0.07, the light emission level of the blue LED included in the peripheral light source units 3 and 5 is increased to 0.07. ing.

When the light emission states of the plurality of light source units are controlled to the second light emission state in FIG. 6C, the intensity distribution of the light emitted from the backlight unit 102 is as shown in FIG. Intensity distribution. FIG. 6D shows that the blue ratio is substantially uniform and the blue ratio is about 0.5 in the partial light emitting region corresponding to the lighting light source unit of No. 4. That is, conditions 1 and 2
It can be seen that is satisfied.

  In FIG. 7 (A), the light emission levels corresponding to the first light emission state are 1.0 in the light source units of numbers 5, 6, 7, and 8, and in the light source units of numbers 1, 2, 3, and 4, The light emission level corresponding to the first light emission state is 0.0. For this reason, the light source portions with numbers 5, 6, 7, and 8 are lighting light source portions. And when each light emission state of a some light source part is controlled to the 1st light emission state of FIG. 7 (A), the intensity distribution of the light emitted from the backlight unit 102 is shown in FIG. 7 (B). Intensity distribution. From FIG. 7B, it can be seen that in the partial light emitting region corresponding to the lighting light source unit of No. 5, there is a position where the blue ratio is not uniform and the blue ratio is not about 0.5.

  In this case, the light emission level of FIG. 7C is obtained as the light emission level corresponding to the second light emission state by the calculation of Expressions 1 to 3. It can be seen from FIG. 7C that the light emission level of the blue LED included in the number 5 lighting light source unit is reduced from 1.0. Specifically, since the conversion coefficient kb (5, 5) of the table data in FIG. 4 is 0.86, the light emission level of the blue LED included in the number 5 lighting light source unit is reduced to 0.86. 7C shows that the light emission level of the blue LED provided in the light source part No. 4 (the peripheral light source part of the lighting light source part No. 5) is increased from 0.0. Specifically, since the conversion coefficient kb (5, 4) is 0.07, the light emission level of the blue LED included in the peripheral light source unit of No. 4 is increased to 0.07. In addition, the light source part of No. 6 is also a peripheral light source part of the lighting light source part of No. 5. The conversion coefficient kb (5, 6) is 0.07. However, since the light emission level of the blue LED included in the peripheral light source unit of No. 6 is 1.0 (upper limit), the light emission level of the blue LED included in the peripheral light source unit of No. 6 cannot be increased from 1.0.

  When the light emission states of the plurality of light source units are controlled to the second light emission state in FIG. 7C, the intensity distribution of the light emitted from the backlight unit 102 is as shown in FIG. Intensity distribution. FIG. 7D shows that the blue ratio is substantially uniform and the blue ratio is about 0.5 in the partial light emission region corresponding to the lighting light source unit of No. 5. That is, it can be seen that the conditions 1 and 2 are satisfied.

  As a specific example, three typical patterns are shown. However, the calculation is the same for any pattern as described above, and the same effect can be obtained by the same calculation for the other patterns. When the light emission level after the change exceeds the upper limit of the light emission level, the light emission level is limited to the upper limit, and when the light emission level after the change is below the lower limit of the light emission level, the light emission level is limited to the lower limit.

As described above, according to the present embodiment, it is possible to change the light emission state of the light emitting device while suppressing the occurrence of unintended color change, unintended color unevenness, and the like. In addition, according to the present embodiment, since the light emission levels of two or more light source units are adjusted at a time, the above-described effects can be obtained with a smaller amount of computation than when the light emission levels are adjusted individually for each light source unit. be able to. Furthermore, according to the present embodiment, since the conversion coefficient between the light source units greatly separated from each other is fixed to zero, when the number N of light source units (N is an integer of 2 or more) increases, the amount of computation O is , Increase in proportion to the number N, not the number N ² . Therefore, it is possible to suppress an increase in calculation amount due to an increase in the number of light source units.

Each functional unit of the above-described embodiment may or may not be individual hardware. The functions of two or more functional units may be realized by common hardware. Each of a plurality of functions of one functional unit may be realized by individual hardware. Two or more functions of one functional unit may be realized by common hardware. Each functional unit may be realized by hardware or not. For example, the apparatus may include a processor and a memory in which a control program is stored. The functions of at least some of the functional units included in the apparatus may be realized by the processor reading and executing the control program from the memory.

  The above-described embodiment is merely an example, and a configuration obtained by appropriately modifying or changing the configuration of the embodiment within the scope of the present invention is also included in the present invention.

<Other embodiments>
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in the computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

102: Backlight unit 103: Liquid crystal panel unit 105: Light emission level determination unit 106: Light emission level conversion unit 107: Backlight control unit

Claims (21)

A plurality of light source units respectively corresponding to a plurality of light emitting areas of the light emitting surface and each including a plurality of light emitting elements having different emission colors;
First determining means for determining, by a predetermined method, a plurality of first light emitting states respectively corresponding to the plurality of light source units as a first light emitting state corresponding to a common light emitting level among the plurality of light emitting elements. When,
As a second light emitting state corresponding to a combination of a plurality of light emitting levels respectively corresponding to the plurality of light emitting elements, a plurality of second light emitting states respectively corresponding to the plurality of light source units are used as the plurality of first light emitting units. Second determining means for determining based on the state;
Control means for controlling the respective light emission states of the plurality of light source units according to the plurality of second light emission states;
With
The second determining means controls the color of the light emitting area corresponding to the lighting light source unit, which is the light source unit in which the first light emitting state is in the lighting state, so that each light emitting state of the plurality of light source units is in a predetermined lighting state. The light emission level of each of the plurality of light emitting elements of each of the two or more light source units including the lighting light source unit corresponds to the first light emission state so as to be substantially equal to the color in the case where the light is emitted. The light emitting device characterized by determining the plurality of second light emission states by changing from a light emission level. The second determining means is configured such that the color distribution of the light emitting region corresponding to the lighting light source unit is substantially equal to the color distribution when the respective light emitting states of the plurality of light source units are controlled to the predetermined lighting state. The light emitting device according to claim 1, wherein the light emitting level of at least one of the plurality of light emitting elements of each of the two or more light source units is changed. The second determining unit is configured such that a color at a position corresponding to a light emission center of the lighting light source unit in the light emitting region corresponding to the lighting light source unit is set so that a light emission state of each of the plurality of light source units is the predetermined lighting state. The light emission level of at least one of the plurality of light emitting elements of each of the two or more light source units is changed so as to be substantially equal to a color when controlled by the light source. 2. The light emitting device according to 2. The second determining means is configured such that a color at a position where the intensity of light emitted from the lighting light source unit is maximum in the light emitting region corresponding to the lighting light source unit is set, and each light emitting state of the plurality of light source units is the predetermined light source. 2. The light emission level of at least one of the plurality of light emitting elements of each of the two or more light source units is changed so as to be substantially equal to a color when controlled to the lighting state. The light emitting device according to any one of claims 3 to 3. The predetermined lighting state corresponds to a light emission level common to the plurality of light emitting elements, and corresponds to a light emission level common to the plurality of light source units. Item 5. The light-emitting device according to any one of Items 4 above. The light-emitting device according to claim 5, wherein the predetermined lighting state corresponds to a maximum light emission level. A plurality of light source units respectively corresponding to a plurality of light emitting areas of the light emitting surface and each including a plurality of light emitting elements having different emission colors;
First determining means for determining, by a predetermined method, a plurality of first light emitting states respectively corresponding to the plurality of light source units as a first light emitting state corresponding to a common light emitting level among the plurality of light emitting elements. When,
As a second light emitting state corresponding to a combination of a plurality of light emitting levels respectively corresponding to the plurality of light emitting elements, a plurality of second light emitting states respectively corresponding to the plurality of light source units are used as the plurality of first light emitting units. Second determining means for determining based on the state;
Control means for controlling the respective light emission states of the plurality of light source units according to the plurality of second light emission states;
With
The second determination means controls the light emission state of each of the plurality of light source units to the first light emission state in a light emission region corresponding to a lighting light source unit whose first light emission state is a light source unit in a lighting state. The light emission level of each of the plurality of light emitting elements of each of the two or more light source units including the lighting light source unit is set to the first light emitting state so that color unevenness that occurs when the light source is generated is reduced. The light emitting device characterized by determining the plurality of second light emission states by changing from a corresponding light emission level. The second determining means determines a light emission level of at least one of the plurality of light emitting elements of each of the two or more light source units from a light emission level corresponding to the first light emission state using a predetermined coefficient. The light-emitting device according to claim 1, wherein the light-emitting device is changed. Each of the two or more light source units may be configured such that the lighting light source unit and the remaining lighting light source unit of the two or more light source units compensate for the change in the light emission level. 9. The light emission according to claim 1, wherein a light emission level of at least one of the plurality of light emitting elements is changed from a light emission level corresponding to the first light emission state. apparatus. In the plurality of light emitting elements, the diffusion of light emitted from a light emitting element whose emission color is a predetermined color is different from the diffusion of light emitted from a light emitting element whose emission color is another color,
The said 2nd determination means changes the light emission level of the light emitting element whose light emission color of each of the said 2 or more light source parts is the said predetermined color, The any one of Claim 1 thru | or 9 characterized by the above-mentioned. The light emitting device according to item. The diffusion of light emitted from the light emitting element whose emission color is the predetermined color is smaller than the diffusion of light emitted from the light emitting element whose emission color is the other color,
The second determining means includes
Reducing the light emission level of the light emitting element whose emission color is the predetermined color of the lighting light source unit from the light emission level corresponding to the first light emission state;
The light emission level of the light emitting element whose emission color is the predetermined color of the remaining lighting light source units of the two or more light source units is increased from the light emission level corresponding to the first light emission state. The light emitting device according to claim 10. The second determining means includes
With respect to the light emitting element having the predetermined color, the predetermined light emission level corresponding to each of the plurality of first light emission states is subjected to predetermined filter processing, thereby corresponding to each of the plurality of second light emission states. Determine multiple light levels,
With respect to the light emitting elements whose emission colors are the other colors, the plurality of second light emitting states are respectively applied to the plurality of light emitting levels corresponding to the plurality of first light emitting states without performing the predetermined filtering process. 12. The light emitting device according to claim 10, wherein a plurality of corresponding light emission levels are determined. The said two or more light source parts are the said lighting light source part and one or more light source parts adjacent to the said lighting light source part, The any one of Claim 1 thru | or 12 characterized by the above-mentioned. Light-emitting device. The light emitting device according to any one of claims 1 to 13, wherein the light emitting region corresponding to the light source unit is a region on the light emitting surface where light from the light source unit is emitted. . The light emitting device according to claim 14, wherein a part of the light emitting region overlaps between the light source unit and a light source unit adjacent to the light source unit. The light emitting device according to any one of claims 1 to 15,
Display means for displaying an image by transmitting light emitted from the light emitting device based on input image data;
A display device comprising: The display device according to claim 16, wherein the first determination unit determines the plurality of first light emission states based on the input image data. Correction means for generating display image data by correcting the input image data based on the plurality of second light emission states;
The display device according to claim 16 or 17, wherein the display means displays the image by transmitting light emitted from the light emitting device according to the display image data. A method for controlling a light emitting device, comprising: a plurality of light source portions each corresponding to a plurality of light emitting areas of a light emitting surface and each having a plurality of light emitting elements having different emission colors,
Determining a plurality of first light emission states respectively corresponding to the plurality of light source units as a first light emission state corresponding to a light emission level common to the plurality of light emitting elements by a predetermined method;
As a second light emitting state corresponding to a combination of a plurality of light emitting levels respectively corresponding to the plurality of light emitting elements, a plurality of second light emitting states respectively corresponding to the plurality of light source units are used as the plurality of first light emitting units. Determining based on the state;
Controlling the respective light emission states of the plurality of light source units according to the plurality of second light emission states;
Have
The color of the light emitting region corresponding to the lighting light source unit that is the light source unit in which the first light emitting state is in the lighting state is substantially the same as the color when the respective light emitting states of the plurality of light source units are controlled to a predetermined lighting state. By changing the light emission level of each of the plurality of light emitting elements of each of the two or more light source units including the lighting light source unit from the light emission level corresponding to the first light emission state so as to be equal to each other. The method for controlling a light emitting device, wherein the plurality of second light emission states are determined. A method for controlling a light emitting device, comprising: a plurality of light source portions each corresponding to a plurality of light emitting areas of a light emitting surface and each having a plurality of light emitting elements having different emission colors,
Determining a plurality of first light emission states respectively corresponding to the plurality of light source units as a first light emission state corresponding to a light emission level common to the plurality of light emitting elements by a predetermined method;
As a second light emitting state corresponding to a combination of a plurality of light emitting levels respectively corresponding to the plurality of light emitting elements, a plurality of second light emitting states respectively corresponding to the plurality of light source units are used as the plurality of first light emitting units. Determining based on the state;
Controlling the respective light emission states of the plurality of light source units according to the plurality of second light emission states;
Have
Color unevenness that occurs when the respective light emission states of the plurality of light source units are controlled to the first light emission state in a light emission region corresponding to a lighting light source unit that is a light source unit in which the first light emission state is a lighting state. The light emission level of at least one of the plurality of light emitting elements of each of the two or more light source units including the lighting light source unit is changed from the light emission level corresponding to the first light emission state. Thus, the control method for the light emitting device, wherein the plurality of second light emission states are determined.   A program for causing a computer to execute each step of the method for controlling a light emitting device according to claim 19 or 20.

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