KR100897652B1 - Output Controller of the Light Source and Method thereof - Google Patents

Abstract

The present invention relates to a light source output control device and method that can adjust the brightness of the image by a percentage with respect to the maximum brightness of the image while maintaining the initially set white balance.

White balance, percent light index, diffractive light modulator, percent brightness

Description

Output controller of the light source and method

1 is a view showing a light source output control apparatus according to an embodiment of the present invention.

2 is a graph for detecting a maximum light output amount and a minimum light output amount.

3 is a graph for detecting light output by dividing N between the minimum and maximum indices.

4 is a block diagram of a display system using a diffractive optical modulator having a light source output adjusting device shown in FIG.

FIG. 5 is a block diagram illustrating a projection control unit and a peripheral device shown in FIG. 4. FIG.

<Description of the symbols for the main parts of the drawings>

100: input unit 102: memory

104: light source output control unit 106: light source driver

108: light source 110: mobile device controller

140: projection control unit 202: video signal input unit

204: Image correction unit 206: Upper electrode voltage range adjustment unit

208: lower electrode voltage adjusting unit 210: video data / synchronization signal output unit

214: Scanner output control

The present invention relates to a light source output control device and method, and more particularly to a light source output control device and method that can adjust the brightness of the image by the percentage of the maximum brightness of the image while maintaining the first set white balance.

Recently, display devices such as personal computers and televisions have been reduced in weight and thickness, and flat panel displays such as liquid crystal displays (LCDs) and projectors have been developed instead of cathode ray tubes (CRTs). have.

In such a flat panel display, a color image is formed using a color filter composed of three primary colors of red (R), green (G), and blue (B), or red (R), green (G), and blue (B). A color image is displayed using an independent light source.

Among the color image representation methods, a color filter requires a unit pixel corresponding to each of the red (R), green (G), and blue (B) regions, so that three times as many pixels as the black and white image are displayed. In order to obtain a high resolution image, a sophisticated manufacturing technique is required.

In addition, if a color image is displayed using a color filter, the color filters of red (R), green (G), and blue (B) must be formed on the flat panel, respectively, which is cumbersome in manufacturing and the light transmittance of the color filter itself. There is a problem that needs to be improved.

For this reason, in the flat panel type display, the method of displaying a color image using individual light sources of red (R), green (G), and blue (B) is mainly used.

At this time, the red (R), green (G) and blue (B) light sources adjust the brightness of the image by the light source output adjusting device.

However, the conventional light source output control device has a problem that when the brightness of the entire image is changed according to the needs of the user or the system, not only the brightness of the image does not show the desired brightness of the user or the system, but also the white balance characteristic initially set does not appear.

In other words, when the same amount of current is applied to each of the red (R), green (G), and blue (B) light sources, the light source ratios of the red (R), green (G), and blue (B) light sources vary from those originally set. Therefore, if the user or the system wants the brightness of about 50% of the maximum brightness, the conventional display device does not display the brightness of the desired image, but also the red (R), green (G), and blue (B) light sources. Since the light source ratio changes, there is a problem in that the initially set white balance characteristic cannot be maintained.

Accordingly, an object of the present invention is to provide an apparatus and method for adjusting a light source output capable of adjusting the brightness of an image by a percentage with respect to the maximum brightness of the image while maintaining the initially set white balance.

In order to achieve the above object, the light source output control apparatus according to an embodiment of the present invention includes an RGB light source for emitting red, green and blue light; A memory in which a percentage light quantity index for each light source for adjusting the overall brightness of the image by percentage with respect to the maximum brightness is stored in the form of a lookup table for each of the red, green, and blue light sources according to the overall brightness variation of the image; A light source output control unit receiving a percentage light quantity index for each light source from the memory and supplying a current amount according to the percentage brightness of the image to a light source driver; And a light source driver for driving each of the RGB light sources with the amount of current supplied from the light source output controller.

In addition, the light source output control method according to an embodiment of the present invention (a) red, green and blue light source to the percentage light amount index for each light source for adjusting the overall brightness of the image by the percentage of the maximum brightness according to the overall change in brightness of the image Storing the memory in the form of a lookup table for each; And (b) adjusting the brightness of the image by receiving a percentage light quantity index for each light source from the memory and supplying a current amount according to the percentage brightness of the image to the light source.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a light source output control device according to an embodiment of the present invention.

1, a light source output adjusting apparatus according to an exemplary embodiment of the present invention includes an RGB light source 108, a light source driver 106, a memory 102, and a light source output controller 104.

The RGB light source 108 emits red (R), green (G) and blue (B) light while maintaining the white balance according to the amount of current supplied from the light source output control unit 104 through the light source driver 106.

The light source driver 106 drives the RGB light source 108 in accordance with the amount of current supplied from the light source output control unit 104.

The memory 102 includes a percentage for adjusting the brightness of the entire image by a percentage with respect to the maximum brightness according to data such as image data, control commands for controlling each part of the mobile or video device, and the overall brightness change amount (%) of the image. (%) The light intensity index is stored in the form of a look-up table (LUT) for each of the red (R), green (G), and blue (B) light sources.

At this time, the percentage (%) light quantity index for each of the red (R), green (G), and blue (B) light sources is stored in the memory 102 before the display device is shipped from the factory by an off line test.

The percentage light amount index for each of the red (R), green (G), and blue (B) light sources is set by the following method and stored in the memory.

First, in order to set the white balance, an arbitrary target color temperature (for example, 10000K) is set, i.e., a target position is determined on the color coordinates so that red (R), green (G) and blue ( B) The light quantity ratio of each light source (for example, R: G: B = α: β: δ) is determined.

Thereafter, as shown in FIG. 2, the minimum index Index_min, which outputs the minimum and maximum light output amounts of the red, green, and blue light sources, respectively, while increasing the index, and The maximum index Index_max is detected.

Here, the index means a current supplied to each of the red (R), green (G), and blue (B) light sources.

In other words, FIG. 2 increases the current supplied to each of the red (R), green (G), and blue (B) light sources, and each of the red (R), green (G), and blue (B) light sources has a minimum light output. The minimum current for outputting and the red (R), green (G) and blue (B) light sources respectively detect the maximum current for outputting the maximum light output.

Subsequently, after dividing the minimum index (Index_min) and the maximum index (Index_max) of each of the red (R), green (G), and blue (B) light sources by N, the index is increased and the light output amount is detected for each N divided indexes. do.

Accordingly, the light output amounts of the red (R), green (G), and blue (B) light sources are detected for each N equal indexes.

The percentage (%) brightness at each index is then calculated using the N light outputs detected by the red (R), green (G) and blue (B) light sources. In this case, the percentage (%) brightness can be obtained by dividing the brightness at the current index by the maximum brightness.

For example, when 128 brightnesses are obtained from 30 to 157 indices, the percentage (%) brightness for each index is calculated as shown in Table 1.

Index brightness Percent Brightness 30 One 0.78 31 2 1.56 32 3 2.34 33 4 3.13 34 5 3.91 ... ... ... 153 124 96.88 154 125 97.66 155 126 98.44 156 127 99.22 157 128 100.00

Table 2 shows the percentage (%) brightness according to N indices for each of the red (R), green (G), and blue (B) light sources.

At this time, r_Index, g_Index, b_Index means the amount of current supplied to the red (R), green (G) and blue (B) light source according to the percent (%) brightness.

N R G B Percent Brightness One r_index_1 g_index_1 b_index_1 1 / n 2 r_index_2 g_index_2 b_index_2 2 / n 3 r_index_3 g_index_3 b_index_3 3 / n 4 r_index_4 g_index_4 b_index_4 4 / n 5 r_index_5 g_index_5 b_index_5 5 / n ... ... ... ... ... n-4 r_index_n-4 g_index_n-4 b_index_n-4 n-4 / n n-3 r_index_n-3 g_index_n-3 b_index_n-3 n-3 / n n-2 r_index_n-2 g_index_n-2 b_index_n-2 n-2 / n n-1 r_index_n-1 g_index_n-1 b_index_n-1 n-1 / n n r_index_n g_index_n b_index_n One

As described above, the light amount index values for each light source shown in Table 2 are stored in the form of a lookup table (LUT).

The light source output controller 104 adjusts the brightness of the user or the system while maintaining the white balance at which the image implemented in the display device is initially set according to the percentage (%) light quantity index values r_Index, g_Index, and b_Index supplied from the memory 102. The amount of current according to the percentage brightness required by the user or the system is supplied from the memory 102 to the light source driver 106 so that the brightness of the image is adjusted in the form of a percentage of the maximum brightness as required.

Accordingly, the light source driver 106 drives the RGB light source 108 to implement the overall brightness of the image in percent brightness while maintaining the white balance initially set according to the user's or system's request.

As described above, the light source output control apparatus according to the embodiment of the present invention sets the initial white balance and then generates a minimum light output and a maximum light output of each of the red (R), green (G), and blue (B) light sources. By dividing the index and the maximum index by N and detecting the light output amount of each of the red (R), green (G), and blue (B) light sources for each N equal indexes, and using the detected N light outputs, the percentage at each index is used. (%) Calculates the brightness and supplies the amount of current according to the percentage (%) brightness to the red (R), green (G), and blue (B) light sources, respectively, according to the user's or system's needs Brightness can be achieved as a percentage of maximum brightness while maintaining the initial white balance.

FIG. 4 is a block diagram of a display system using a diffractive optical modulator including the light source output adjusting device shown in FIG. 1.

Referring to FIG. 4, a display system using a diffractive optical modulator includes an input unit 100, a memory 102, a wireless communication unit 112, a baseband processor 116, an image module processor 118, and a display unit 120. , A multimedia processor 122, and an optical modulator projector 130.

The input unit 100 includes at least one of a button, a keypad, a touch screen, and a remote controller, and inputs information input from an external device, that is, a user command.

The memory 102 is a percentage for adjusting the brightness of the entire image by a percentage with respect to the maximum brightness according to data such as image data and setting values of each part of the mobile device controller, that is, a control command and the overall brightness change amount (%) of the image. (%) The light quantity index value is stored in the form of a look-up table (LUT) for each of the red (R), green (G), and blue (B) light sources.

Since the memory 102 is the same as the memory 102 of the light source output control apparatus according to the exemplary embodiment of the present invention illustrated in FIG. 1, the detailed description will be replaced with the above description.

The wireless communication unit 112 performs wireless communication with an external system.

The baseband processor 116 controls the wireless communication unit 112 to perform wireless communication with an external system, and controls the image sensor module processor 118 to receive an image image from a provided camera or the like, and controls the image image. The multimedia processor 122 is controlled to display on the display 120. In addition, the baseband processor 116 controls the projection control unit 140 of the optical modulator projector 130, which is a display system using a diffractive light modulator, so that the image image is projected on the screen 160.

In this case, the baseband processor 116 is a projection control unit 140 of the optical modulator projector 130 which is a display system using a wireless communication unit 112, an image sensor module processor 118, a multimedia processor 122, and a diffractive optical modulator. To control. The baseband processor 116 may be referred to as a mobile device controller, ie, a portable terminal control system, for controlling mobile devices such as HHP, PDA, PMP, Note PC, and the like.

The image sensor module processor 118 processes the input image when the image is input from a camera or the like provided according to a control command from the baseband processor 116 to process the processed image image data into the multimedia processor 122 and / or Transmit to baseband processor 116.

The display unit 120 displays the video image data supplied from the multimedia processor 122 on the screen.

The multimedia processor 122 adapts the image image data supplied from the image sensor module processor 118 and the image data stored in the memory 102 to the screen of the display unit 120 according to a control command from the baseband processor 116. The image is processed and supplied to the display unit 120.

The optical modulator projector 130 generates a video image according to the image image data received from the multimedia processor 122 and / or the baseband processor 116 by using a diffractive optical modulator under the control of the baseband processor 116. Afterwards, the generated video image is enlarged and projected on the screen 160. At this time, the baseband processor 116 supplies the image data stored in the memory 102 to the optical modulator projector 130. The light modulator projector 130 includes a projection control unit 140 and a light modulation optical system 150.

The projection control unit 140 allows the light modulation optical system 150 to generate an image according to the image image data received from the multimedia processor 122 and the baseband processor 116 according to a control signal received from the baseband processor 116. The light modulation optical system 150 is controlled. As illustrated in FIG. 7, the projection control unit 140 includes an image signal input unit 202, an image correction unit 204, an upper electrode voltage range adjusting unit 206, a lower electrode voltage adjusting unit 208, and image data / synchronization. The signal output unit 210, the light source output control unit 104 and the scanner output control unit 214. Detailed description thereof will be described later.

The light modulation optical system 150 generates an image image according to a control signal input from the projection control unit 140 and enlarges the generated image image and projects the generated image image on the screen 160. The light modulation optical system 150 includes a light source system 151, an illumination optical unit 152, a diffractive light modulator 153, a schlieren optical unit 154, and a projection and scanning optical unit 155.

The light source system 151 generates and emits red (R), green (G), and blue (B) light according to the light source switching control signal supplied from the projection control unit 140, and the illumination optical unit 152 emits light. The light emitted from 151 is incident on the diffractive light modulator 153.

The diffractive light modulator 153 diffracts the light incident from the illumination optical unit 152 according to the image data signal, the reference voltage, the lower electrode voltage, the vertical synchronization signal, and the horizontal synchronization signal supplied from the projection control unit 140 ( That is, the illumination optical unit 152 diffracts the incident light to form diffracted light having a plurality of diffraction orders. In this case, any one or multiple orders of diffraction light among the plurality of diffraction orders are desired. Create an image) Create a video image.

The schlieren optical unit 154 passes the diffracted light of the desired order in the plurality of orders of the diffracted light generated by the diffractive light modulator 153.

The projection and scanning optics 155 project an image of the diffraction light that has passed through the schlieren optics 154 onto the screen 160.

FIG. 5 is a block diagram illustrating a projection control unit and a peripheral device shown in FIG. 4.

Referring to FIG. 5, the projection control unit 140 includes an image signal input unit 202, an image correction unit 204, an upper electrode voltage range adjusting unit 206, a lower electrode voltage adjusting unit 208, and an image data / synchronous signal output unit. 210, a light source output controller 104, and a scanner output controller 214, and perform an interface function with the mobile device controller 110 and the memory 102. Here, the mobile device controller 110 represents the baseband processor 116 shown in FIG.

The image signal input unit 202 receives the image data signal RGB, the vertical sync signal Vsync, and the horizontal sync signal Hsync from the baseband processor 116, and receives the input image data signal RGB and the vertical sync signal ( Vsync) and horizontal sync signal (Hsync).

In addition, the image signal input unit 202 receives an image data signal from the multimedia processor 122 and outputs the image data signal to the image correction unit 204.

The image correction unit 204 converts the horizontally aligned image data signals supplied from the image signal input unit 202 into a vertical image data signal by performing data transpose, and supplies the image data signals from the image signal input unit 202. The vertical synchronization signal Vsync and the horizontal synchronization signal Hsync are buffered.

In the case of the optical modulation optical system 150 using the diffractive optical modulator 153, the image correction unit 204 scans and displays a horizontal direction in contrast to a plurality of pixels arranged vertically. Pose.

In addition, the image corrector 204 sets N gamma reference voltages of red (R), green (G), and blue (B) light sources, respectively (N is determined by gradation), and red (R), green ( G) and blue (B) light sources, and transpose according to the pixel-specific correction data for each light source by the number of pixels (the number of vertical resolutions, i.e., the number of mirrors) * n (n depends on the correction method). The corrected video data signal.

The upper electrode voltage range adjusting unit 206 adjusts the range of voltage to be supplied to the upper electrode of the optical modulator according to the image data signal input from the image correcting unit 204 to drive the optical modulator panel 304. Supplies). In this case, the optical modulator panel 304 and the panel driver 302 are components constituting the diffractive optical modulator 153.

The lower electrode voltage adjusting unit 208 adjusts the voltage to be supplied to the lower electrode of the optical modulator according to the image data signal input from the image correcting unit 204 and supplies it to the optical modulator panel 304.

The image data / synchronization signal output unit 210 outputs the image data signal RGB, the vertical synchronization signal Vsync, and the horizontal synchronization signal Hsync input from the image correction unit 204 to the panel driver 302 and the light source output controller. It supplies to the 104 and the scanner output control part 214.

The memory 102 adjusts the brightness of the entire image by a percentage with respect to the maximum brightness according to data such as image data and the setting value of each part of the mobile device controller 110, that is, a control command and the overall brightness change amount (%) of the image. Percentage (%) light index value is stored in the form of a look-up table (LUT) for each of the red (R), green (G), and blue (B) light sources.

Since the memory 102 is the same as the memory 102 of the light source output control apparatus according to the exemplary embodiment of the present invention illustrated in FIG. 1, the detailed description will be replaced with the above description.

The light source output control unit 104 maintains the white balance of the image implemented through the display unit 120 according to the percentage (%) light amount index values r_Index, g_Index, and b_Index supplied from the memory 102. The memory 102 receives a current amount according to the percentage brightness required by the user or the system so that the brightness of the image is adjusted in the form of a percentage of the maximum brightness according to a user command or a brightness control request of the system supplied through 100). Supply to the light source driver 106.

At this time, the light source output control unit 104 synchronizes the vertical synchronization signal Vsync and the horizontal synchronization signal Hsync supplied from the image data / synchronization signal output unit 210 with the amount of current supplied from the memory 102. 106).

Accordingly, the light source driver 106 drives the RGB light source 108 in accordance with the amount of current supplied from the light source output control unit 104. As a result, the red (R), green (G), and blue (B) light sources emit light to maintain the white balance.

Here, the light source 108 and the light source driver 106 are components constituting the light source system 151.

The scanner output control unit 214 drives the scanning device 308 with the image data signal RGB supplied from the image data / synchronization signal output unit 210 according to the vertical synchronization signal Vsync and the horizontal synchronization signal Hsync. Supply to scanner driver 306.

Here, the scanning device 308 and scanner driver 306 are the components that make up the projection and scanning optics 155.

In the display system using the diffractive optical modulator according to the embodiment of the present invention having such a configuration, after setting the initial white balance, the minimum light output and the maximum light output of each of the red (R), green (G), and blue (B) light sources are obtained. The minimum index and the maximum index for generating the light output amount are divided into N equal parts, and the light output amounts of the red (R), green (G), and blue (B) light sources are detected for each N equal indexes, and then the detected N light output amounts are determined. Calculate the percent (%) brightness at each index and supply the amount of current according to the percent (%) brightness to each of the red (R), green (G), and blue (B) light sources, if required by the user or system. According to the requirements of the overall brightness of the image can be realized as the percentage of the maximum brightness while maintaining the initial white balance.

As described above, according to the present invention, after setting the initial white balance, the minimum and maximum indices for generating the minimum and maximum light outputs of each of the red, green, and blue light sources are divided into N equal portions, and the red, green, After detecting the light output of each of the green and blue light sources, calculate the percentage (%) brightness at each index using the detected N light outputs. And by supplying to the blue light sources, the overall brightness of the image may be realized as a percentage brightness of the maximum brightness while maintaining the initially set white balance according to a user or system's request.

Claims (5)

delete An RGB light source for emitting red, green and blue light; A memory in which a percentage light quantity index for each light source for adjusting the overall brightness of the image by percentage with respect to the maximum brightness is stored in the form of a lookup table for each of the red, green, and blue light sources according to the overall brightness variation of the image; A light source output control unit receiving a percentage light quantity index for each light source from the memory and supplying a current amount according to the percentage brightness of the image to a light source driver; And A light source driver for driving each of the RGB light sources with an amount of current supplied from the light source output control unit, The percentage light quantity index for each light source is the RGB detected for every N equalized indexes when N is divided between a minimum index for outputting the minimum light output amount of each of the RGB light sources and a maximum index for outputting the maximum light output amount for each of the RGB light sources. The brightness of each of the RGB light sources according to the light output of each light source is divided by the maximum brightness of each of the RGB light sources, and is calculated as a percentage brightness at which the brightness of the image can be adjusted from 1 / N percent to 100 percent. And a current amount supplied to each of the RGB light sources such that the brightness is adjusted to the percentage brightness of any one of the 1 / N percent to 100 percent. The method of claim 2, And the percentage light quantity index for each light source is set by the light quantity ratio of the RGB light source according to an arbitrary target color temperature. delete (a) storing, in the form of a look-up table for each of red, green, and blue light sources, a percentage light quantity index for each light source for adjusting the overall brightness of the image by percentage with respect to the maximum brightness according to the overall brightness variation of the image; And (b) receiving a percentage light quantity index for each light source from the memory and supplying a current amount according to the percentage brightness of the image to a light source to adjust the brightness of the image, Step (a) is (a-1) setting a light quantity ratio of an RGB light source according to an arbitrary target color temperature; (a-2) detecting a minimum light output and a maximum light output of each of the red, green, and blue light sources by supplying current to each of the red, green, and blue light sources; (a-3) N-dividing between the minimum current outputting the minimum light output amount and the maximum current outputting the maximum light output amount and detecting the light output amount of each of the red, green, and blue light sources according to the N equalized current value Making; And (a-4) dividing the light output amount at the current index by the maximum light output amount for each of the red, green, and blue light sources.

Images