JP2010072103A - Image display, image display method, image display processing program, and computer readable recording medium with image display processing program recorded thereon - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display that detects temperature of each display region, calculates a conversion amount of each display region with respect to an image databased on the detection result, and displays the image using the conversion amount, even when temperature variation occurs on each display region of a display panel according to the displayed image. <P>SOLUTION: The image display 100 controls each brightness of illumination light emitted from each illumination region 221 of a back light 22, and an image is displayed by irradiating each display region 211 of a corresponding display panel 21. A detection section 13 detects the temperature of each display region 211 of the display panel 21 based on the detection result. A setting section 12 sets a conversion parameter according to the temperature of each display region 211 of the display panel 21 based on the detection result. A calculating section 11 calculates the conversion amount of a current frame with respect to the image data for each display region 211 of the display panel 21 by using the conversion parameter which is set for each display region 211 of the display panel 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image display device, an image display method, an image display processing program, and an image display that display an image by irradiating a display panel with illumination light emitted from each region of a backlight divided into a plurality of regions. The present invention relates to a computer-readable recording medium on which a processing program is recorded.

  As personal computers and television receivers are becoming lighter and thinner, display devices used in personal computers and the like are also required to be lighter and thinner. As such a display device, for example, a flat panel display device such as a liquid crystal display device is widely used.

  Recently, liquid crystal display devices have been widely used as display devices for television receivers. However, since the response speed of the liquid crystal display device is generally slower than that of a display device such as a CRT, it has a disadvantage that it is difficult to display a moving image with high accuracy.

  Considering such a situation, the grayscale voltage for the current frame image signal is higher or lower than the predetermined voltage according to the change between the past image signal and the current frame image signal. A so-called overshoot drive in which a voltage, that is, an overshoot drive voltage is applied to a liquid crystal layer of a display panel has been proposed.

  Specifically, for example, in Patent Document 1, when there is a change in the image data between the screen of the past frame and the screen of the current frame, the overshoot amount of the drive voltage is set so that the change becomes larger. A liquid crystal display device that sets and emphasizes data is disclosed.

  In the liquid crystal display device disclosed in Patent Document 1, image data is excessively emphasized, overshoot driving is performed to reach a display exceeding the target within one frame period, and the original image data is restored within one frame period. The corresponding display can be made.

Further, in the liquid crystal display device disclosed in Patent Document 1, the illumination device is divided into a plurality of regions, and a plurality of light sources corresponding to the respective regions are provided. The lighting time and lighting timing of each area of the lighting device are controlled for each area, and lighting can be turned on and off independently for each area. And the lighting timing and lighting time of the area | region of a corresponding illuminating device are controlled according to the writing timing of each area | region of the display panel in 1 frame.
JP 2005-122121 A (published on May 12, 2005)

  In the conventional liquid crystal display device disclosed in Patent Document 1, the illumination of each area of the illumination device is switched between on and off according to the image displayed on the display panel. A difference in lighting time inevitably occurs between the areas.

  As a result, in the display area of the display panel, when there are areas where the illumination light from the illumination device is irradiated for a long time and areas where the illumination light is irradiated for only a short time, there is a large temperature between these areas. A difference occurs.

  For example, when a bright image continues in some areas of the display panel and a dark image continues in other areas, the former temperature rises rapidly while the latter temperature changes only slightly. . For this reason, the temperature distribution in the display panel is not constant and changes according to the image displayed on the display panel.

  On the other hand, it is known that the response speed of the liquid crystal layer of the display panel is very temperature dependent. For this reason, when a temperature distribution occurs in the display panel as described above, an overshoot amount is set for each region based on the temperature for each region of the display panel, and overshoot drive is controlled for each region. There is a need.

  However, in the conventional liquid crystal display device, the temperature of each area of the display panel is not detected, and overshoot driving of each area is not controlled based on these temperatures. However, there is a problem that overshoot driving cannot be performed stably.

  In particular, in recent years, as a lighting device used in a display device or the like, a plurality of regions for emitting illumination light are provided, and the brightness (luminance) of the illumination is controlled for each of the regions according to an image displayed on the display panel. Area active backlights are attracting attention. Since this area active backlight does not illuminate the entire surface uniformly, the lighting timing and lighting time of the illumination light is controlled in accordance with the display image image for each area, so the temperature variation of each area of the display panel may increase. Many. Therefore, the above problem is a very serious problem for the area active backlight.

  In view of the above problems, an object of the present invention is to individually control the luminance of illumination light emitted from each region of a backlight divided into a plurality of regions and display the image by irradiating the display panel. In the image display device, even when temperature variation occurs between the display areas of the display panel according to the image to be displayed, the temperature of each display area is detected, and conversion to the image data of each display area is performed based on the detection result An object is to provide an image display device, an image display method, an image display processing program, and a computer-readable recording medium on which an image display processing program is recorded. .

  In order to achieve the above object, an image display device according to the present invention individually controls the luminance of illumination light emitted from each region of a backlight divided into a plurality of regions, and the corresponding display panel An image display device that irradiates each area and displays an image, the detecting means for detecting the temperature of each area of the display panel, and a conversion parameter corresponding to the temperature of each area of the display panel. Setting means for setting each display panel area based on a detection result, and a conversion parameter set for each display panel area by the setting means, the conversion amount for image data for each display panel area. Calculating means for calculating.

  For example, the calculation unit calculates a conversion amount for the image data of the current frame using a conversion parameter corresponding to a combination of the image data of the current frame and the image data of the frame before the current frame.

  In the above image display device, when the illumination light emitted from each region of the backlight divided into a plurality of regions is irradiated to each region of the corresponding display panel and the image is displayed, the detection unit includes The temperature of each area of the display panel is detected, and the setting means sets a conversion parameter corresponding to the temperature of each area of the display panel. For this reason, even if temperature variations occur in each area of the display panel, the calculation means calculates the conversion amount for the image data of the current frame using, for example, a conversion parameter set according to the temperature of each area of the display panel. Since it can be calculated for each area of the display panel, an image can be displayed on the display panel with high accuracy.

  The setting means classifies each area of the display panel according to a predetermined temperature for each predetermined temperature range, and sets the same conversion parameter in the calculation means for the areas of the display panel belonging to the same temperature range. It is preferable to do.

  In this case, since the number of conversion parameters to be set by the setting unit can be reduced, the setting process by the setting unit can be performed more efficiently.

  The image processing apparatus further includes a storage unit that temporarily stores a conversion parameter corresponding to the temperature of each area of the display panel, and the setting unit displays the display each time the detection unit detects the temperature of each area of the display panel. It is preferable to obtain a conversion parameter corresponding to the temperature of each region of the panel and update the conversion parameter stored in the storage unit.

  In this case, since the number of conversion parameters stored in the temporary storage unit can be minimized, the capacity and cost of the temporary storage unit can be reduced.

  The detection means acquires light source information representing a lighting state including a lighting time and a lighting timing for a light source arranged in each region of the backlight from a drive circuit that drives the backlight, and the acquired light source It is preferable to detect the temperature of each area of the display panel based on the information.

  In this case, the temperature of each region can be detected without directly measuring the temperature of each region of the display panel. For this reason, the detection means can be realized with a simple configuration, and the cost of the apparatus itself can be reduced.

  A reference area to be used as a reference when detecting the temperature of each area of the display panel among the areas of the display panel is determined in advance, and the setting means includes a reference temperature to which the reference area of the display panel belongs. Each region of the display panel is preferably classified into any one of a range, an upper limit temperature range exceeding the upper limit of the reference temperature range, and a lower limit temperature range lower than the lower limit of the reference temperature range.

  In this case, since the temperature range in which each area of the display panel should be classified is set around the reference area that should be used as a temperature detection reference, each area of the display panel can be efficiently classified into each temperature range. .

  In the image display method according to the present invention, the brightness of each illumination light emitted from each region of the backlight divided into a plurality of regions is individually controlled, and each region of the corresponding display panel is irradiated with an image. An image display method for displaying, comprising: a detection step of detecting a temperature of each region of the display panel; and a conversion parameter corresponding to the temperature of each region of the display panel based on a detection result in the detection step. A setting step for setting each region of the display panel, and a calculation step for calculating a conversion amount for the image data for each region of the display panel using the conversion parameter set for each region of the display panel in the setting step. ing.

  In the calculation step, for example, the conversion amount for the image data of the current frame is calculated using a conversion parameter corresponding to the combination of the image data of the current frame and the image data of the frame before the current frame.

  In the above image display method, in the case where an image is displayed by irradiating each area of the corresponding display panel with each of the illumination light emitted from each area of the backlight divided into a plurality of areas, The temperature of each area is detected, and a conversion parameter is set according to the temperature of each area of the display panel. For this reason, even if a temperature variation occurs in each area of the display panel, for example, the conversion amount for the image data of the current frame is converted using the conversion parameter set according to the temperature of each area of the display panel. Therefore, it is possible to display an image on the display panel with high accuracy.

  The image display device may be realized by a computer. In this case, an image display processing program for causing the image display device to be realized by the computer by causing the computer to operate as the respective means, and recording the program. Such computer-readable recording media also fall within the scope of the present invention.

  As described above, the image display device of the present invention individually controls the luminance of the illumination light emitted from each area of the backlight divided into a plurality of areas, and irradiates each area of the corresponding display panel. An image display device for displaying an image, and detecting means for detecting the temperature of each area of the display panel, and a conversion parameter corresponding to the temperature of each area of the display panel based on the detection result of the detecting means Setting means for setting for each area of the display panel, and calculating means for calculating a conversion amount for the image data for each area of the display panel using a conversion parameter set for each area of the display panel by the setting means. And.

  Therefore, even when temperature variation occurs between the display areas of the display panel depending on the image to be displayed, the temperature of each display area of the display panel is detected, and the amount of conversion for each display area based on the detection result There is an effect that can be calculated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same part, and what attached the same code | symbol in drawing may abbreviate | omit description.

  An image display apparatus according to an embodiment of the present invention displays an image composed of a plurality of consecutive frames on a display panel according to a change between an image signal of a past frame and an image signal of a current frame. Display the drive voltage higher than the predetermined voltage (overshoot drive voltage) or the drive voltage lower than the predetermined voltage (undershoot drive voltage) for the current frame image signal. A liquid crystal driving method applied to the liquid crystal layer of the panel is performed. Hereinafter, this liquid crystal driving method is referred to as overshoot driving.

  In addition, the image display device according to the present embodiment divides the backlight that irradiates the display panel with illumination light into a plurality of areas, and controls the light emission of the light source corresponding to each area while controlling the illumination light from each area. Each is irradiated onto the display panel. Hereinafter, this backlight is referred to as an area active backlight. Each area of the area active backlight (hereinafter referred to as “illumination area”) and each area of the display panel (hereinafter referred to as “display area”) have a one-to-one correspondence with each illumination area of the backlight. Each of the illumination lights emitted from the light is irradiated to each display area of the display panel corresponding to each illumination area.

  Furthermore, the image display apparatus according to the present embodiment detects the temperature of each display area of the display panel that changes according to the image displayed on the display panel, and overshoots for each display area based on the detection result. By setting (conversion amount) and overshoot driving for each display area, a high-quality image can be displayed on the display panel.

  FIG. 1 is a block diagram showing a configuration of an image display apparatus according to an embodiment of the present invention. As shown in FIG. 1, an image display device 100 according to an embodiment of the present invention includes a control device 10, a display panel 21, a backlight 22, a panel drive circuit 23, a light drive circuit 24, and a conversion parameter storage unit. 25.

  The display panel 21 has a configuration in which a liquid crystal layer is provided between an active matrix substrate and a counter substrate. Here, the display panel 21 is divided into five parts in the vertical direction and five parts in the horizontal direction, and 25 display areas 211 are arranged. Of course, the number of vertical and horizontal divisions is set according to the size of the display panel 21.

  The display panel 21 has a plurality of scanning lines (not shown) arranged substantially parallel to each other, and a plurality of data lines (not shown) arranged so as to be substantially orthogonal to the respective scanning lines. A pixel is provided at each intersection of the scanning line and the data line.

  Similar to the display panel 21, the backlight 22 is divided into five in the vertical direction and five in the horizontal direction, and 25 illumination areas 221 are arranged. A light source such as an LED is disposed in each illumination area 221, and each illumination area 221 emits illumination light emitted from the light source in each illumination area 221 toward the display area 211 of the display panel 21 corresponding to each illumination area 221. Irradiate.

  The backlight 22 is an area active backlight that can individually control the light emission of the light source in each illumination area 221. Each light source may be composed of, for example, one or more red LEDs, one or more green LEDs, and one or more blue LEDs. The number of vertical and horizontal divisions of the backlight 22 is set according to the number of vertical and horizontal divisions of the display panel 21.

  The panel drive circuit 23 generates a panel drive signal S10 for driving the display panel 21 based on the image signal S1, and outputs it to the display panel 21. The panel drive circuit 23 includes a data driver (not shown) connected to each of the data lines of the display panel 21 and a source driver (not shown) connected to each of the scanning lines of the display panel 21. The gate driver is controlled to display an image corresponding to the image signal S1 on the display panel 21.

  Further, when the panel drive circuit 23 displays an image corresponding to the image signal S 1 on the display panel 21, overshoot drive for each display region 211 of the display panel 21 based on the image conversion signal S 4 output from the control device 10. I do. This image conversion signal S4 represents the amount of overshoot for each display area 211 of the display panel 21, and the panel drive circuit 23 uses each display area 211 of the display panel 21 based on the image signal S1 and the image conversion signal S4. A driving voltage for driving is determined.

  The light drive circuit 24 generates a light drive signal S11 for controlling the light emission of each light source arranged in each illumination area 221 of the backlight 22 based on the image signal S1, and outputs the light drive signal S11 to the backlight 22. The write drive circuit 24 includes a column driver (not shown) and a row driver (not shown), and controls the column driver and the row driver to display illumination light for displaying an image on the display panel 21. 21 is irradiated.

  The control device 10 includes a calculation unit (calculation unit) 11, a setting unit (setting unit) 12, a detection unit (detection unit) 13, a temporary storage unit (storage unit) 14, and a frame storage unit 15. is doing.

  The calculation unit 11 acquires an image signal S1 representing an image of the current frame and an image signal S2 representing an image one frame before, and performs an overshoot calculation using the image signals S1 and S2. Here, this overshoot calculation compares the image signal S1 and the image signal S2, calculates the gradation change amount of the image data between the image signal S1 and the image signal S2, and the gradation change amount is more This is for setting the overshoot amount (conversion amount) of the drive voltage so as to increase. Then, the calculation unit 11 performs this overshoot calculation for each display area 211 of the display panel 21.

  In addition, the calculation unit 11 acquires a conversion parameter S <b> 3 necessary for setting the overshoot amount of each display region 211 in order to perform the overshoot calculation for each display region 211 of the display panel 21. Here, a plurality of conversion parameters corresponding to the liquid crystal temperature are prepared as the conversion parameter S3 in consideration of the temperature dependence of the response speed of the liquid crystal layer so that the optimum overshoot calculation is performed depending on the temperature of the liquid crystal layer. Yes.

  The setting unit 12 acquires an appropriate image signal conversion table S7 from the plurality of image signal conversion tables stored in the conversion parameter storage unit 25, based on the temperature information S5 output from the detection unit 13. Then, the image signal conversion table S6 as the acquisition result is temporarily stored in the temporary storage unit 14. Here, the temperature information S5 is information representing the temperature of each display region 211 of the display panel 21. The setting unit 12 acquires the temperature of each display area 211 of the display panel 21 from the temperature information S5, and stores an image signal conversion table S7 including a conversion parameter corresponding to the temperature of each display area 211 from the acquisition result. Obtained from the unit 25.

  The detection unit 13 detects the temperature of each display area 211 of the display panel 21, generates temperature information S 5 based on the detection result, and outputs the temperature information S 5 to the setting unit 12. The detection unit 13 includes a temperature sensor 26 for measuring the temperature of the display area 211 for temperature measurement selected in advance among the display areas 211 of the display panel 21.

  The temperature sensor 26 measures the surface of the temperature measurement display area 211 of the display panel 21 and outputs the measured temperature S8 to the detection unit 13. The temperature sensor 26 may be installed on the surface of the display panel 21 so that the temperature of the panel surface of the display panel 21 can be directly measured, or the display panel 21 so that the temperature of the panel surface can be indirectly measured. The surface temperature of the display panel 21 may be measured based on the temperature measured at the installation location.

  Here, as the temperature measurement display area 211 of the display panel 21, for example, the display area 211 arranged near the center of the display panel 21 may be used. In general, an image displayed in the display area 211 near the center of the display panel 21 often has a standard brightness. Therefore, the temperature of the display area 211 near the center is equal to the average temperature in the display panel 21. Because it is expected to be. Therefore, in this case, the temperature of the temperature measurement display area 211 has a standard temperature in the display panel 21 and is regarded as a reference temperature for detecting the temperature of each display area 211 of the display panel 21. Can do. Of course, the temperature measurement display area 211 that is actually measured by the temperature sensor 26 does not necessarily have a standard temperature in the display panel 21.

  In addition, the detection unit 13 acquires, from time to time, light source information S9 representing the lighting status of each light source including the lighting timing and lighting time of each light source arranged in each illumination area 221 of the backlight 22 from the light driving circuit 24. . And the detection part 13 detects the temperature of each display area 211 of the display panel 21 using the measurement result of the temperature sensor 26, and light source information S9. For example, the detection unit 13 acquires the lighting state of the illumination area 221 of the backlight 22 corresponding to the temperature measurement display area 211, and calculates the temperature of the other display area 211 from the correlation between the acquisition result and the temperature sensor 26. What is necessary is just to detect.

  The temporary storage unit 14 temporarily stores the image signal conversion table S6 acquired by the setting unit 12, and outputs the stored image signal conversion table S6 to the setting unit 12 again. Then, when a new image signal conversion table S7 is acquired by the setting unit 12, the temporary storage unit 14 deletes the previously stored image signal conversion table S6, and an image signal that is a new acquisition result. The conversion table S6 is stored. Therefore, for example, as long as the power is turned on, the temporary storage unit 14 can be an SRAM or DRAM that is a semiconductor memory in which data is held. By using such a semiconductor memory, the setting unit 12 can access the temporary storage unit 14 at high speed, and the temporary storage unit 14 is realized at low cost.

  The frame storage unit 15 stores the image signal S1, and outputs the stored image signal S1 to the calculation unit 11 as an image signal S2 representing an image one frame before. Then, when a new image signal S1 is input, the frame storage unit 15 erases the previously stored image signal S1 and stores the new image signal S1. For this reason, as with the temporary storage unit 14, the frame storage unit 15 can be, for example, an SRAM or DRAM, which is a semiconductor memory that holds data, as long as the power is on. By using such a semiconductor memory, the calculation unit 11 can access the frame storage unit 15 at high speed, and the frame storage unit 15 is realized at low cost.

  The conversion parameter storage unit 25 stores a plurality of image signal conversion tables in advance. Since the conversion parameter storage unit 25 needs to store a plurality of image signal conversion tables, a magnetic disk device such as an HDD or an EEPROM that is a semiconductor memory that can keep data even when the power is turned off may be used.

  As shown in FIG. 2, the conversion parameter storage unit 25 stores a plurality of temperature ranges 252 and a plurality of image signal conversion tables 251 corresponding to the respective temperature ranges 252. Each image signal conversion table 251 is used when overshoot driving is performed on the display area 211 of the display panel 21 having a temperature included in the corresponding temperature range 252.

  Here, FIG. 3 shows an example of the image signal conversion table. In the image signal conversion table 251a, the previous frame image signal Gi is represented as a table row, and the current frame image signal Gj is represented as a gradation of 256 levels as a table column. A conversion parameter α (Gi, Gj) to be used when the gray levels of the previous frame image signal Gi and the current frame image signal Gj are the gray levels of each row and each column is arranged at the intersection of each row and each column. Has been. Further, as in the image conversion signal table 251b shown in FIG. 4, a gradation range for each of the 17 gradations is set for each row and column, and the previous frame image signal Gi and the current frame image signal Gj are set at the intersection of each row and each column. The conversion parameter β (Gi, Gj) to be used when the gray level is included in the gray level range of each row and each column may be arranged.

  Next, the setting unit 12 will be further described with reference to FIG. FIG. 5 is a block diagram illustrating a configuration example of the setting unit 12. As illustrated in FIG. 5, the setting unit 12 includes a classification unit 121, a classification reference storage unit 122, a matching unit 123, and a selection unit 124.

  The classification unit 121 acquires the temperature information S5 output from the detection unit 13, and classifies each display area 211 of the display panel 21 according to the classification standard S12 stored in advance in the classification standard storage unit 122. Specifically, the classification unit 121 classifies each display area 211 of the display panel 21 into a plurality of temperature ranges based on the temperature of each display area 211 of the display panel 21. The plurality of temperature ranges are defined in the classification standard S12, and usually correspond to the temperature range 252 stored in the conversion parameter storage unit 25. Then, the classification unit 121 generates classification information S13 representing the temperature range to which the temperature of each display area 211 of the display panel 21 belongs, and outputs the classification information S13 to the collation unit 123.

  Further, the classification unit 121 classifies each display area 211 of the display panel 21 into a plurality of temperature ranges, a temperature range to which the temperature of the temperature measurement display area 211 belongs (hereinafter referred to as “reference temperature range”), One of a temperature range exceeding the upper limit of the reference temperature range (hereinafter referred to as “upper limit temperature range”) and a temperature range lower than the lower limit of the reference temperature range (hereinafter referred to as “lower limit temperature range”). Alternatively, the display areas 211 of the display panel 21 may be classified. For example, in the case of FIG. 2, if the reference temperature range to which the temperature of the temperature measurement display area 211 belongs is “25 ° C. to 30 ° C.”, the upper limit temperature range is set to “30 ° C. to 40 ° C.” May be “20 ° C. to 25 ° C.”. In this case, the display area 211 of the display panel 21 having a temperature exceeding “40 ° C.” belongs to the upper limit side temperature range, and the display area 211 having a temperature lower than “20 ° C.” belongs to the lower limit side temperature range. To do.

  In this way, the classification unit 121 can reduce the number of temperature ranges to which the temperatures of the display areas 211 of the display panel 21 belong. For this reason, the number of image signal conversion tables to be acquired by the collation unit 123 described later can be reduced. As a result, the number of image signal conversion tables to be stored in the temporary storage unit 14 is reduced. Therefore, the capacity and cost of the temporary storage unit 14 can be further reduced.

  The matching unit 123 acquires the temperature range to which the temperature of each display region 211 of the display panel 21 belongs from the classification information S13 output from the classification unit 121. And the collation part 123 collates the temperature range memorize | stored in the conversion parameter memory | storage part 25, and the temperature range to which the temperature of each display area 211 of the display panel 21 belongs, and the conversion parameter memory | storage part 25 based on the collation result. The image signal conversion table S6 corresponding to the temperature range to which the temperature of each display area 211 of the display panel 21 belongs is acquired from the image signal conversion table S7 stored in the storage panel 14, and stored in the temporary storage unit 14.

  When the calculation unit 11 performs overshoot calculation for each display area 211 of the display panel 21, the selection unit 124 displays the display area in which overshoot calculation is performed from the image signal conversion table stored in the temporary storage unit 14. The image signal conversion table S6 corresponding to the temperature range to which the temperature 211 belongs is selected, and the selected image signal conversion table S6 is output as the conversion parameter S3.

  Next, the detection unit 13 will be further described with reference to FIG. FIG. 6 is a block diagram illustrating a configuration example of the detection unit 13. As illustrated in FIG. 6, the detection unit 13 includes a determination unit 131 and a light source information storage unit 132.

  The determination unit 131 acquires the measured temperature S8 of the temperature measurement display area 211, which is the measurement result of the temperature sensor 26. And the determination part 131 determines the temperature of each display area 211 of the display panel 21 using the acquired measurement temperature S8 and the light source information S14 memorize | stored in the light source information storage part 132, and uses the result of the determination. Based on this, temperature information S5 is generated.

  When the light drive circuit 24 controls the light emission of each light source arranged in each illumination area 221 of the backlight 22, the light source information storage unit 132 receives light source information S 9 representing the lighting state of each light source from the light drive circuit 24. Acquire and store as appropriate. Then, when the determination unit 131 determines the temperature of each display area 211 of the display panel 21, the light source information storage unit 132 outputs the light source information S14 stored therein to the determination unit 131.

  Next, operation | movement of the control apparatus 10 of the image display apparatus 100 concerning this Embodiment is demonstrated using FIG. FIG. 7 is a flowchart for explaining the operation of the control device 10. Here, as shown in FIG. 8, each display area 211 of the display panel 21 includes display areas (1, 1), (1, 2), (1, 3),... (5, 3). , (5, 4), (5, 5), and the light sources corresponding to the illumination regions 221 of the backlight 22 are light sources (1, 1), (1, 2), ( 1,3),... (5,3), (5,4), (5,5). Further, the temperature measurement display area 211 of the display panel 21 is the display area (3, 3) of FIG.

  In FIG. 7, the control apparatus 10 detects the temperature of each display area of the display panel 21 (step S101).

  In this step S101, when the measurement temperature S8 measured by the temperature sensor 26 is input, the determination unit 131 of the detection unit 13 receives the input measurement temperature S8 and the light source stored in the light source information storage unit 132. Using the information S14, the temperature of each display region 211 of the display panel 21 is determined.

  Here, the light source information storage unit 132 acquires and stores the light source information S9 from the light driving circuit 24 as needed. Therefore, the determination unit 131 includes the light sources (1, 1), (1, 2), (1, 3) in FIG. 9 (5, 3), (5, 4), (5, 5). The temperature of each display area other than the temperature measurement display area 211 is determined from the lighting timing, lighting time, etc. up to the present. Then, the determination unit 131 generates temperature information S5 based on the determination result and outputs the temperature information S5 to the setting unit 12.

  Next, the classification unit 121 of the setting unit 12 acquires the temperature information S5 from the detection unit 13, and classifies each display region 211 of the display panel 21 based on the temperature information S5 (step S102).

  In step S102, the classification unit 121 acquires the temperature information S5 output from the detection unit 13, and recognizes the temperature of each display area 211 of the display panel 21 from the temperature information S5. Then, the classification unit 121 classifies each display area 211 of the display panel 21 according to each temperature, for each temperature range defined by the classification standard S12 stored in the classification standard storage unit 122.

  Here, if the classification standard S12 defines the above-described reference temperature range, upper limit temperature range, and lower limit temperature range, the classification unit 121 sets each display region 211 of the display panel 21 to the reference temperature range, It is classified into either an upper limit temperature range or a lower limit temperature range.

  In this way, the classification unit 121 generates the classification information S13 representing the temperature range to which the temperature of each display area 211 of the display panel 21 belongs, and outputs the classification information S13 to the matching unit 123.

  Next, the collation unit 123 of the setting unit 12 acquires the classification information S13 from the classification unit 121, and based on the classification information S13, among the image signal conversion table S7 stored in the conversion parameter storage unit 25, The image signal conversion table S6 to be stored in the temporary storage unit 14 is determined (step S103).

  In this step S103, the collation unit 123 acquires the classification information S13 from the classification unit 121, and recognizes the temperature range to which the temperature of each display region 211 of the display panel 21 belongs from the classification information S13. That is, the temperature of each display area 211 of the display panel 21 belongs to one of the recognized temperature ranges, and the collation unit 123 receives the table for image signal conversion corresponding to this temperature range from the conversion parameter storage unit 25. It should be acquired.

  Therefore, the collation unit 123 collates the temperature range stored in the conversion parameter storage unit 25 with the temperature range to which the temperature of each display area 211 of the display panel 21 belongs, and the conversion parameter storage unit 25 based on the collation result. The image signal conversion table S6 corresponding to the temperature range to which the temperature of each display area 211 of the display panel 21 belongs is acquired from the image signal conversion table S7 stored in the table.

  Next, the collation unit 123 stores the acquired image signal conversion table S6 in the temporary storage unit 14 (step S104).

  In step S104, the collation unit 123 deletes the image signal conversion table S6 previously described in the temporary storage unit 14 and stores the newly acquired image signal conversion table S6 in the temporary storage unit 14. Remember. That is, the collation unit 123 updates the image signal conversion table S6 stored in the temporary storage unit 14.

  Here, if the classification standard S12 defines the reference temperature range, the upper limit temperature range, and the lower limit temperature range, the collation unit 123 stores the image signal conversion table S6 stored in the temporary storage unit 14. The number is three. For example, in the case of FIG. 2, when the reference temperature range is “25 ° C. to 30 ° C.”, the upper temperature range is “30 ° C. to 40 ° C.”, and the lower temperature range is “20 ° C. to 25 ° C.” The unit 123 acquires the tables B, C, and D of FIG. 2 corresponding to each temperature range as the image signal conversion table S6 stored in the temporary storage unit 14.

  In this case, for example, as shown in FIG. 10, the temperature measurement display area (3, 3) belonging to the reference temperature range, the display areas (1, 3) to (1, 5), (2, 1) to (2, 4), (3, 1), (3, 2), (3, 5), (4, 1), (4, 2), (5, 1) to (5, 3), (5, 5) Table C corresponds to the display areas (3, 4), (4, 3) to (4, 5), (5, 4) belonging to the upper temperature range, and Table B corresponds to the lower temperature limit. The table D corresponds to the display areas (1, 1) and (1, 2) belonging to the range.

  Next, the selection unit 124 of the setting unit 12 selects a conversion parameter to be output to the calculation unit 11 (step S105).

  In step S <b> 105, when the calculation unit 11 performs the overshoot calculation for each display area 211 of the display panel 21, the selection unit 124 selects an overshoot from the image signal conversion table stored in the temporary storage unit 14. The image signal conversion table S6 corresponding to the temperature range to which the temperature of the display area 211 to be shoot calculated belongs is selected. Then, the selection unit 124 outputs the selected image signal conversion table S6 to the calculation unit 11 as the conversion parameter S3.

  Here, for example, as shown in FIG. 10, if any of the tables B, C, and D corresponds to each display area 211 of the display panel 21, the selection unit 124 causes the calculation unit 11 to display the display area. (1,3) to (1,5), (2,1) to (2,4), (3,1) to (3,3), (3,5), (4,1), (4 , 2), (5, 1) to (5, 3), (5, 5), the table C is read from the temporary storage unit 14 and output to the calculation unit 11 when the overshoot calculation is executed. . Further, when the calculation unit 11 performs an overshoot operation on the display areas (3, 4), (4, 3) to (4, 5), (5, 4), the table B is temporarily stored. 14 and output to the calculation unit 11. Further, when the calculation unit 11 performs an overshoot calculation on the display areas (1, 1) and (1, 2), the table D is read from the temporary storage unit 14 and output to the calculation unit 11.

  Next, the calculation unit 11 performs an overshoot calculation on each display region 211 of the display panel 21 using the conversion parameter S3 acquired from the setting unit 12. Then, the calculation unit 11 generates an image conversion signal S4 for each display area 211 and outputs it to the panel drive circuit 23 (step S106).

  In step S106, the calculation unit 11 acquires an image signal S1 representing an image of the current frame and an image signal S2 representing an image one frame before, and performs an overshoot calculation using the image signals S1 and S2. To do. When executing the overshoot calculation, the calculation unit 11 performs the overshoot calculation for each display area 211 of the display panel 21, and the conversion parameter S3 necessary for setting the overshoot amount of each display area 211 is calculated. Is acquired from the setting unit 12.

  Here, for example, as shown in FIG. 10, if any of the tables B, C, and D corresponds to each display area 211 of the display panel 21, the calculation unit 11 displays the display area (1, 3 ) To (1,5), (2,1) to (2,4), (3,1) to (3,3), (3,5), (4,1), (4,2), When overshoot calculation is performed on (5, 1) to (5, 3), (5, 5), the gradation of the image data of the current frame in the display area and the level of the image data of the previous frame are displayed. A conversion parameter is acquired from the table C based on the key. Then, the calculation unit 11 outputs the acquired conversion parameter as an image conversion signal S4.

  In addition, when the calculation unit 11 performs overshoot calculation on the display areas (3, 4), (4, 3) to (4, 5), (5, 4), the current frame in the display area is displayed. Conversion parameters are acquired from the table B based on the gradation of the image data and the gradation of the image data one frame before. Then, the calculation unit 11 outputs the acquired conversion parameter as an image conversion signal S4.

  Furthermore, when the calculation unit 11 performs the overshoot operation on the display areas (1, 1) and (1, 2), the gradation of the image data of the current frame in the display area and the image one frame before A conversion parameter is acquired from the table D based on the gradation of the data. Then, the calculation unit 11 outputs the acquired conversion parameter as an image conversion signal S4.

  In this way, the control device 10 repeats the above steps S101 to S106 (NO in step S107) until the display of the image is completed (YES in step S107).

  As described above, according to the embodiment of the present invention, the image display device displays an image by irradiating the display panel with each of the illumination lights emitted from the respective regions of the backlight divided into a plurality of regions. In this case, even when temperature variation occurs between the display areas of the display panel according to the image to be displayed, the temperature of each display area is detected, and overshoot driving of each display area is performed based on the detection result. Therefore, the moving image can be displayed with high accuracy without depending on the display image.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible in the range shown to the claim. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

  Finally, each block of the image display device 100, in particular, the control device 10 may be configured by hardware logic, or may be realized by software using a CPU as follows.

  That is, the control device 10 includes a CPU (central processing unit) that executes instructions of a control program for realizing each function, a ROM (read only memory) that stores the program, a RAM (random access memory) that expands the program, A storage device (recording medium) such as a memory for storing the program and various data is provided. An object of the present invention is to provide a recording medium in which a program code (execution format program, intermediate code program, source program) of a control program of the control device 10 which is software that realizes the above-described functions is recorded so as to be readable by a computer. This can also be achieved by supplying the control device 10 and reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU).

  Examples of the recording medium include a tape system such as a magnetic tape and a cassette tape, a magnetic disk such as a floppy (registered trademark) disk / hard disk, and a compact disk-ROM / MO / MD / digital video disk / compact disk-R. A disk system including an optical disk, a card system such as an IC card (including a memory card) / optical card, or a semiconductor memory system such as a mask ROM / EPROM / EEPROM / flash ROM can be used.

  Further, the control device 10 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited. For example, the Internet, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available. Also, the transmission medium constituting the communication network is not particularly limited. For example, even in the case of wired such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL line, etc., infrared rays such as IrDA and remote control, Bluetooth ( (Registered trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

  The present invention can be applied to, for example, a liquid crystal television having an image display device that displays an image by irradiating a display panel with illumination light emitted from each region of a backlight divided into a plurality of regions. As the backlight, a light emitting element such as a light emitting diode (LED), an organic EL light emitting element, or an inorganic EL light emitting element can be used.

It is a block diagram which shows the structure of the image display apparatus concerning embodiment of this invention. It is a figure for demonstrating the conversion parameter memory | storage part. It is a figure which shows the specific example of the table for image signal conversion. It is a figure which shows the other specific example of the table for image signal conversion. It is a block diagram which shows the structure of a setting part. It is a block diagram which shows the structure of a detection part. It is a flowchart explaining operation | movement of a control apparatus. It is a figure for demonstrating a display panel. It is a figure for demonstrating a backlight. It is a figure for demonstrating a display panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Control apparatus 11 Calculation part (calculation means)
12 Setting part (setting means)
13 Detection unit (detection means)
14 Temporary storage unit (storage unit)
15 Frame storage unit 21 Display panel 22 Backlight 23 Panel drive circuit 24 Light drive circuit (drive circuit)
25 conversion parameter storage unit 26 temperature sensor 100 image display device 121 classification unit 122 classification reference storage unit 123 collation unit 124 selection unit 131 determination unit 132 light source information storage unit

Claims (9)

An image display device that individually controls the luminance of each illumination light emitted from each region of the backlight divided into a plurality of regions and displays an image by irradiating each region of the corresponding display panel,
Detecting means for detecting the temperature of each region of the display panel;
Setting means for setting a conversion parameter corresponding to the temperature of each area of the display panel for each area of the display panel based on a detection result of the detection means;
An image display apparatus comprising: a calculation unit that calculates a conversion amount for image data for each area of the display panel using a conversion parameter set for each area of the display panel by the setting unit.   The calculation means calculates a conversion amount for image data of a current frame using a conversion parameter corresponding to a combination of image data of a current frame and image data of a frame before the current frame. Item 4. The image display device according to Item 1.   The setting means classifies each area of the display panel according to a predetermined temperature for each predetermined temperature range, and sets the same conversion parameter in the calculation means for the areas of the display panel belonging to the same temperature range. The image display device according to claim 1, wherein: A storage unit that temporarily stores conversion parameters according to the temperature of each area of the display panel;
The setting means obtains a conversion parameter corresponding to the temperature of each area of the display panel each time the detecting means detects the temperature of each area of the display panel, and converts the conversion parameter stored in the storage unit. The image display device according to claim 1, wherein the image display device is updated.   The detection means acquires light source information representing a lighting state including a lighting time and a lighting timing for a light source arranged in each region of the backlight from a drive circuit that drives the backlight, and the acquired light source The image display device according to claim 1, wherein the temperature of each region of the display panel is detected based on information. A reference area to be used as a reference when detecting the temperature of each area of the display panel among the areas of the display panel is predetermined,
The setting means is any one of a reference temperature range to which a reference region of the display panel belongs, an upper temperature range exceeding an upper limit of the reference temperature range, and a lower temperature range lower than a lower limit of the reference temperature range. The image display device according to claim 3, wherein each region of the display panel is classified.   The image display processing program for operating a computer as each means in the image display apparatus of any one of Claims 1-6.   A computer-readable recording medium on which the image display processing program according to claim 7 is recorded. An image display method for individually controlling the brightness of each illumination light emitted from each area of a backlight divided into a plurality of areas and irradiating each area of a corresponding display panel to display an image,
A detection step of detecting the temperature of each area of the display panel;
A setting step for setting a conversion parameter according to the temperature of each region of the display panel for each region of the display panel based on a detection result in the detection step;
And a calculation step of calculating a conversion amount for image data for each area of the display panel using the conversion parameter set for each area of the display panel in the setting step. .

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