Display device for setting tolerance voltage and working method thereof

Abstract

The invention provides a display device for providing set tolerance voltage and a working method thereof. The display device includes: a display section including pixels of a first color, a second color, and a third color; a data driving unit that supplies a plurality of test voltages to the pixels of the display unit through the data lines, thereby displaying a test image through the display unit; and a tolerance voltage setting unit that determines a dominant color on the basis of the test image displayed on the display unit, and individually sets tolerance voltages corresponding to the first to third colors on the basis of the dominant color.

Description

Technical Field

[0001] The invention relates to a display device for setting a margin voltage and a working method thereof. Background Art

[0002] Normally, the same black data is set in display devices manufactured through the same process, and the black data is set based on the sample with the worst characteristics and driving conditions.

[0003] In order to prevent the power supply voltage of the display device from changing with temperature and thus failing to display a black image, a margin voltage may be added to the voltage for setting black data. However, adding a margin voltage may increase the power consumption of the display device. Summary of the invention

[0004] The technical problem to be solved is to provide a display device and an operating method thereof that can reduce power consumption by setting a margin voltage applicable when setting black data for each color.

[0005] A display device involved in one embodiment of the present invention includes: a display unit, including pixels of a first color, a second color and a third color; a data driving unit, supplying a plurality of test voltages to the pixels of the display unit through data lines, thereby displaying a test image through the display unit; and a tolerance voltage setting unit, determining a dominant color based on the test image displayed in the display unit, and individually setting tolerance voltages corresponding to the first color to the third color based on the dominant color.

[0006] If the dominant color is the first color, the tolerance voltage setting unit only sets the size of the tolerance voltage of the first color; if the dominant color is the second color, the tolerance voltage setting unit only sets the size of the tolerance voltage of the second color; if the dominant color is the third color, the tolerance voltage setting unit only sets the size of the tolerance voltage of the third color.

[0007] The tolerance voltage setting unit determines color areas corresponding to the multiple test voltages among multiple color areas, generates multiple judgment values ​​corresponding to the multiple color areas based on the determined color areas, and determines the dominant color based on the color area with the maximum value among the multiple judgment values.

[0008] The margin voltage setting unit sets weight values ​​for the plurality of test voltages, respectively, and adds the weight values ​​of the test voltages respectively located in the plurality of color regions to generate the plurality of determination values.

[0009] The margin voltage setting unit sets different weight values ​​for the plurality of test voltages, respectively, and sets a maximum weight value for a reference voltage among the plurality of test voltages.

[0010] The margin voltage setting unit sets a larger weight value as the difference between the magnitude of each of the plurality of test voltages and the magnitude of the reference voltage is smaller.

[0011] The margin voltage setting section sets, as the reference voltage, a test voltage corresponding to a luminance value having a smallest difference from a reference luminance among a plurality of luminance values ​​respectively corresponding to the plurality of test images.

[0012] The margin voltage setting unit sets the same weight value for each of the plurality of test voltages.

[0013] The plurality of color regions are distinguished in the CIE 1931 color coordinate system.

[0014] The plurality of test voltages are voltages set to display a black image in the display device.

[0015] In a working method of a display device involved in one embodiment of the present invention, the display device includes pixels of a first color, a second color, and a third color, and the working method of the display device includes: a step of supplying multiple test voltages to the pixels to display a test image through the pixels; a step of determining color areas corresponding to the multiple test voltages respectively among multiple color areas based on the test image; a step of generating multiple judgment values ​​corresponding to the multiple color areas respectively based on the determined color areas; a step of determining a dominant color based on a color area with a maximum judgment value among the multiple judgment values; and a step of setting a tolerance voltage based on the dominant color.

[0016] The step of setting the margin voltage based on the dominant color includes the step of respectively setting the magnitude of the margin voltage of the first color, the magnitude of the margin voltage of the second color, and the magnitude of the margin voltage of the third color based on the dominant color.

[0017] If the dominant color is the first color, only the size of the tolerance voltage of the first color is set; if the dominant color is the second color, only the size of the tolerance voltage of the second color is set; if the dominant color is the third color, only the size of the tolerance voltage of the third color is set.

[0018] The step of generating the plurality of determination values ​​respectively corresponding to the plurality of color regions includes: the step of setting weight values ​​for the plurality of test voltages respectively; and the step of adding the weight values ​​of the test voltages respectively located in the plurality of color regions.

[0019] The step of respectively setting weight values ​​for the plurality of test voltages includes: the step of respectively setting different weight values ​​for the plurality of test voltages.

[0020] The step of setting different weight values ​​for the plurality of test voltages includes the step of setting a larger weight value as the difference between the magnitude of each of the plurality of test voltages and the magnitude of the reference voltage is smaller.

[0021] The operating method of the display device further includes: receiving a plurality of brightness values ​​respectively corresponding to the plurality of test voltages; and setting the test voltage corresponding to the brightness value having the smallest difference with the reference brightness among the plurality of brightness values ​​as the reference voltage.

[0022] The step of respectively setting weight values ​​for the plurality of test voltages includes: the step of respectively setting the same weight value for the plurality of test voltages.

[0023] The plurality of color regions are distinguished in the CIE 1931 color coordinate system.

[0024] The plurality of test voltages are voltages set to display a black image in the display device.

[0025] (Effects of the Invention)

[0026] According to the display device and the operating method thereof of the present invention, the display device can set a margin voltage applicable when setting black data according to color, thereby reducing power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a diagram showing a display device according to an embodiment of the present invention.

[0028] Figure 2 This is a diagram schematically showing the configuration of a system for setting a margin voltage according to an embodiment of the present invention.

[0029] Figure 3 This is a block diagram showing a margin voltage setting unit according to an embodiment of the present invention.

[0030] Figure 4 This is a table showing, as an example, factors determined by a dominant color determination unit according to an embodiment of the present invention.

[0031] Figure 5 FIG. 4 is a diagram showing the color coordinates of the test voltage according to an embodiment of the present invention in a color region.

[0032] Figure 6 It is a sequence diagram showing the operation of the margin voltage setting unit according to one embodiment of the present invention. DETAILED DESCRIPTION

[0033] Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. The present invention can be implemented in various forms and is not limited to the embodiments described below.

[0034] In the drawings, in order to clearly illustrate the present invention, parts not related to the present invention are omitted, and the same symbols are used for similar parts throughout the specification.

[0035] In addition, the terms "unit", "module" and the like used below or the functional modules shown in the drawings may be implemented by software, hardware or a combination thereof. In order to clearly explain the technical concept of the present disclosure, detailed descriptions of repeated components are omitted.

[0036] Figure 1 It is a diagram showing a display device according to an embodiment of the present invention.

[0037] Reference Figure 1 The display device 10 according to the embodiment of the present invention may include a display unit 100 , a timing control unit 210 , a scan driving unit 220 , a data driving unit 230 , a light emitting driving unit 240 , a margin voltage setting unit 300 , and a storage medium 400 .

[0038] The timing control unit 210 may generate a scan drive control signal SCS, a data drive control signal DCS, and a light emitting drive control signal ECS based on a signal input from the outside. The timing control unit 210 may provide the scan drive control signal SCS to the scan drive unit 220, provide the data drive control signal DCS to the data drive unit 230, and provide the light emitting drive control signal ECS to the light emitting drive unit 240.

[0039] The scanning driving unit 220 can generate scanning signals to be provided to the scanning lines S1, S2, ..., Sn based on the scanning driving control signal SCS. For example, the scanning driving unit 220 can be configured as a shift register, and can generate scanning signals by sequentially transmitting a scanning start signal in the form of a pulse as a conduction level to the next driving stage circuit according to the control of the scanning driving control signal SCS. n can be an integer greater than 0.

[0040] If scanning signals are sequentially supplied to the scanning lines S1 to Sn, the pixels PXL can be selected in units of horizontal lines. To this end, the scanning signals can be set to a gate-on voltage (eg, a low-level voltage) so that the transistors included in the pixels PXL can be turned on.

[0041] The data driving part 230 may generate data voltages to be supplied to the data lines D1, D2, ..., Dm based on the data driving control signal DCS. m may be an integer greater than 0. The data voltages supplied to the data lines D1 to Dm may be supplied to the pixels PXL selected according to the scan signal.

[0042] The data voltage may include a gray voltage for a pixel of a first color, a gray voltage for a pixel of a second color, and a gray voltage for a pixel of a third color. For example, the first color may be red, the second color may be green, and the third color may be blue.

[0043] The light driving unit 240 may generate a light control signal to be provided to the light control lines E1, E2, ..., En based on the light driving control signal ECS. In one embodiment, the light driving unit 240 may sequentially supply the light control signal to the light control lines E1 to En.

[0044] If the emission control signals are sequentially supplied to the emission control lines E1 to En, the pixels PXL may not emit light in units of horizontal lines. To this end, the emission control signals may be set to a gate-off voltage (eg, a high-level voltage) so that the transistors included in the pixels PXL can be turned off.

[0045] On the other hand, Figure 1 2 shows a case where the scanning driving unit 220 and the light emitting driving unit 240 are configured separately, but the present invention is not limited thereto. For example, the scanning driving unit 220 and the light emitting driving unit 240 may be formed as one driving unit.

[0046] In addition, the scanning driving unit 220 and / or the light emitting driving unit 240 may be mounted on the substrate through a thin film process. In addition, the scanning driving unit 220 and the light emitting driving unit 240 may be located on both sides with the display unit 100 therebetween.

[0047] The display unit 100 may include a plurality of pixels PXL connected to the data lines D1Dm, the scan lines S1Sn, and the emission control lines E1En. The pixels PXL may receive an initialization power Vint, a first power ELVDD, and a second power ELVSS from the outside.

[0048] The display unit 100 may include pixels that emit light of a first color, pixels that emit light of a second color, and pixels that emit light of a third color. For example, the first color may be red, the second color may be green, and the third color may be blue. Magenta, cyan, and yellow may be used as the first to third colors instead of red, green, and blue. However, in the embodiments of the present invention, for ease of explanation, red, green, and blue are used as the first to third colors, magenta is expressed as a combination of red and blue, cyan is expressed as a combination of green and blue, and yellow is expressed as a combination of red and green.

[0049] The pixel PXL may receive a data voltage from the data lines D1 to Dm each time a scan signal is supplied to the scan lines S1 to Sn. The pixel PXL receiving the data voltage may control the amount of current flowing from the first power source ELVDD to the second power source ELVSS via an organic light emitting diode (not shown) corresponding to the data voltage. The first power source ELVDD may be set to a voltage higher than the second power source ELVSS.

[0050] exist Figure 1 , the pixel PXL is connected to one scanning line Si, one data line Dj, and one emission control line Ei, but the present invention is not limited thereto. For example, a plurality of scanning lines and a plurality of emission control lines may be connected to the pixel PXL corresponding to the circuit structure of the pixel PXL.

[0051] The margin voltage setting unit 300 can analyze the dominant color of the black image displayed by the display device 10 to set the size of the margin voltage. The margin voltage can be a voltage added to the data voltage in order to stably display the black image even if the display device 10 is affected by the surrounding environment. The dominant color can be the dominant color constituting the black image.

[0052] The margin voltage setting unit 300 may determine the dominant color based on the brightness value Ti_L and the color coordinate CC of the image displayed by the display device 10 .

[0053] The margin voltage may correspond to a margin voltage for a pixel of the first color, a margin voltage for a pixel of the second color, and a margin voltage for a pixel of the third color. The margin voltage setting unit 300 may separately set the magnitude of the margin voltage for the pixel of the first color, the pixel of the second color, and the pixel of the third color, respectively, according to the color of the dominant color of the black image.

[0054] The margin voltage setting section 300 may supply data V_mg regarding the size of the margin voltage to the timing control section 210. Figure 1As shown, the margin voltage setting section 300 may be arranged in the preceding stage of the timing control section 210. In this case, the margin voltage setting section 300 may be included in a main system (not shown) that generates a plurality of clock signals and outputs them to the timing control section 210. However, the present invention is not limited thereto, and the margin voltage setting section 300 may be formed as a structure separate from the main system.

[0055] Alternatively, the margin voltage setting section 300 may be disposed between the timing control section 210 and the data driving section 230 , or may be included inside the timing control section 210 .

[0056] The storage medium 400 may include a tolerance voltage table TB and region data RD. The tolerance voltage table TB may include the size of the tolerance voltages respectively set for pixels of the first color to the third color according to the dominant color. The region data RD may include color coordinates defining each color region for determining the dominant color. For example, the region data RD may be color coordinates respectively defining regions distinguished in the CIE1931 color coordinate system.

[0057] The margin voltage setting part 300 may set the margin voltages for the pixels of the first to third colors based on the margin voltage table TB and the dominant color stored in the storage medium 400 .

[0058] Figure 2 This is a diagram schematically showing the configuration of a system for setting a margin voltage according to an embodiment of the present invention.

[0059] Reference Figure 1 and Figure 2 , a system for setting the size of a tolerance voltage may include a display section 100 , a display driving section 200 , a tolerance voltage setting section 300 , a storage medium 400 , and a measuring device 500 .

[0060] Here, the display unit 100, the display driving unit 200, the margin voltage setting unit 300, and the storage medium 400 may constitute Figure 1 In addition, the display driving unit 200 may include Figure 1 The timing control unit 210, the scan driving unit 220, the data driving unit 230 and the light emitting driving unit 240 are shown.

[0061] When the test voltage V_Test is applied to the display unit 100 and a test image is displayed, the measuring device 500 can measure the brightness value Ti_L for the test image. Figure 1 The timing control unit 210 of the embodiment of the present invention transmits a voltage control signal V_CTRL. For example, the voltage control signal V_CTRL can represent the magnitude of the test voltage V_Test.

[0062] The display driving unit 200 may apply a test voltage V_Test to the display unit 100 in response to the voltage control signal V_CTRL. For example, the display driving unit 200 may apply the test voltage V_Test through the data lines D1 to Dm while supplying scan signals to the scan lines S1 to Sn, so that the display unit 100 may display a test image.

[0063] The measuring device 500 may determine the brightness value Ti_L based on the displayed test image, and transmit the determined brightness value Ti_L to the margin voltage setting section 300. In addition, the measuring device 500 may calculate the color coordinates CC from the displayed test image, and transmit the calculated color coordinates CC to the margin voltage setting section 300. The color coordinates CC may be coordinates that match the test image displayed based on the test voltage V_Test in the CIE1931 color coordinate system.

[0064] The tolerance voltage setting unit 300 may be connected to the measuring device 500, so as to obtain the brightness value Ti_L and the color coordinate CC of the test image from the measuring device 500. For example, the tolerance voltage setting unit 300 may be temporarily connected to the measuring device 500 during the manufacturing of the display device 10, or may be temporarily connected to the measuring device 500 after the manufacturing of the display device 10 is completed. If the tolerance voltage setting unit 300 sets the size of the tolerance voltage, the display device 10 may be separated from the measuring device 500.

[0065] The tolerance voltage setting unit 300, the storage medium 400 and the measuring device 500 are shown as being separately configured, but the present invention is not limited thereto. For example, the tolerance voltage setting unit 300, the storage medium 400 and the measuring device 500 may be configured as one driving unit or one device.

[0066] Figure 3 This is a block diagram showing a margin voltage setting unit according to an embodiment of the present invention.

[0067] Reference Figure 2 and Figure 3 , the margin voltage setting section 300 may include a reference voltage setting section 310 and a dominant color determining section 320 .

[0068] The reference voltage setting unit 310 may set the reference voltage based on the luminance value Ti_L of the image displayed on the display unit 100. The reference voltage may be a voltage applied to the display unit 100 when the display unit 100 displays a black image.

[0069] The reference voltage setting unit 310 may transmit a voltage control signal V_CTRL to the display driving unit 200 so that the test voltage V_Test is applied to the display unit 100. The magnitude of the test voltage V_Test may be set in consideration of the case of displaying a black image. For example, the minimum value of the test voltage V_Test may be 5.1V and the maximum value may be 6.3V.

[0070] The reference voltage setting section 310 may receive a luminance value Ti_L of a test image displayed based on the test voltage V_Test from the measuring device 500 .

[0071] In one embodiment, the reference voltage setting unit 310 may set the test voltage V_Test corresponding to the brightness value having the smallest difference with the reference brightness among the received plurality of brightness values ​​as the reference voltage. The reference brightness may be the brightness value of a black image displayed on the display unit 100. For example, the reference brightness may be 0.001 Nits.

[0072] In one embodiment, the reference voltage setting unit 310 can determine whether the brightness value Ti_L of the test image is below the reference brightness. If the brightness value Ti_L is below the reference brightness, the reference voltage setting unit 310 can set the test voltage V_Test corresponding to the brightness value Ti_L as the reference voltage. If the brightness value Ti_L is greater than the reference brightness, the reference voltage setting unit 310 can change the size of the test voltage V_Test. For example, the size of the test voltage V_Test can be reduced by the reference value. The reference value can be changed according to the user's setting.

[0073] The reference voltage setting section 310 may receive the color coordinates CC of the test image displayed according to the test voltage V_Test from the measuring device 500 .

[0074] The reference voltage setting section 310 may output data indicating the magnitudes of the reference voltage and the test voltage V_Test and the color coordinate CC corresponding to the test voltage V_Test to the dominant color determination section 320 .

[0075] The dominant color determination unit 320 may determine the color region corresponding to the test voltage V_Test based on the color coordinates CC received from the reference voltage setting unit 310 and the region data RD stored in the storage medium 400. For example, the dominant color determination unit 320 may determine the color region where the test voltage V_Test is located in the CIE1931 color coordinate system based on the color coordinates CC corresponding to the test voltage V_Test.

[0076] The dominant color determination unit 320 may set a weight value for the test voltage V_Test according to the magnitudes of the reference voltage and the test voltage V_Test received from the reference voltage setting unit 310. The smaller the difference between the reference voltage and the test voltage V_Test is, the higher the weight value may be set.

[0077] The dominant color decision section 320 may generate a determination value for each color region based on a weight value set for the test voltage V_Test. The dominant color decision section 320 may determine a dominant color based on a color region having a maximum determination value.

[0078] The dominant color determination unit 320 may set the margin voltage based on the determined dominant color and the margin voltage table TB stored in the storage medium 400. In one embodiment, the dominant color determination unit 320 may determine the magnitude of the margin voltage of the first color, the magnitude of the margin voltage of the second color, and the magnitude of the margin voltage of the third color based on the determined dominant color.

[0079] For example, if the dominant color is the first color, the dominant color determination unit 320 can only set the size of the tolerance voltage of the first color; if the dominant color is the second color, the dominant color determination unit 320 can only set the size of the tolerance voltage of the second color; if the dominant color is the third color, the dominant color determination unit 320 can only set the size of the tolerance voltage of the third color.

[0080] In other words, the dominant color determination unit 320 may set a margin voltage for a color corresponding to the dominant color among the first to third colors, and may not set a margin voltage for other colors. Figure 4 and Figure 5 Together later.

[0081] The dominant color decision unit 320 may output data V_mg for the set margin voltage to the display driving unit 200. The display driving unit 200 may add the margin voltage to a voltage for displaying a black image and output the result to the display unit 100.

[0082] Figure 4 This is a table showing, as an example, factors determined by a dominant color determination unit according to an embodiment of the present invention. Figure 5 FIG. 4 is a diagram showing the color coordinates of the test voltage according to an embodiment of the present invention in a color region.

[0083] Reference Figures 3 to 5 , the dominant color determination unit 320 can determine the color area where each test voltage is located, which illustrates the operation of determining the dominant color.

[0084] The following description will be given by taking the case where the reference brightness is set to 0.001 nits as an example.

[0085] The dominant color determination section 320 may receive the reference voltage, the magnitude of each of the first to fifth test voltages V1 to V5, and the color coordinates CC respectively corresponding to the first to fifth test voltages V1 to V5 from the reference voltage setting section 310. The magnitude of the first test voltage V1 may be 5.9 V, the magnitude of the second test voltage V2 may be 5.8 V, the magnitude of the third test voltage V3 may be 5.7 V, the magnitude of the fourth test voltage V4 may be 5.6 V, and the magnitude of the fifth test voltage V5 may be 5.5 V. At this time, the fourth test voltage V4 having the smallest difference from the reference brightness may be set as the reference voltage.

[0086] The dominant color determination unit 320 may determine the color region for the first test voltage V1 to the fifth test voltage V5 based on the region data RD stored in the storage medium 400. Figure 5 , showing the CIE1931 color coordinate system including the first region A to the seventh region G. In one embodiment, the region data RD stored in the storage medium 400 may be respectively defined Figure 5 The color coordinates of the area of ​​the CIE1931 color coordinate system are shown.

[0087] The dominant color of the first region A may be green. The dominant color of the second region B may be cyan. The third region C may have no dominant color. The dominant color of the fourth region D may be yellow. The dominant color of the fifth region E may be blue. The dominant color of the sixth region F may be magenta. The dominant color of the seventh region G may be red.

[0088] The color region of the present invention is not limited to Figure 5 , the color coordinates defining each color region can be different according to the user's settings. Figure 5 Although seven color regions are shown in FIG. 1 , the present invention is not limited thereto and may be divided into more than seven color regions according to user settings.

[0089] The dominant color determination unit 320 may determine the color regions where the first test voltage V1 to the fifth test voltage V5 are located based on the color coordinates CC of each of the first test voltage V1 to the fifth test voltage V5. The color coordinates CC may include an x ​​coordinate and a y coordinate. Figure 4 and Figure 5Since the x coordinate of the first test voltage V1 on the CIE1931 color coordinate system is 0.5110 and the y coordinate is 0.4674, the first test voltage V1 may be located in the fourth region D. Since the x coordinate of the second test voltage V2 on the CIE1931 color coordinate system is 0.5999 and the y coordinate is 0.3839, the second test voltage V2 may be located in the seventh region G.

[0090] The dominant color determination unit 320 may set weight values ​​for the first test voltage V1 to the fifth test voltage V5, respectively. In one embodiment, the dominant color determination unit 320 may set the same weight value for the first test voltage V1 to the fifth test voltage V5, respectively. For example, the dominant color determination unit 320 may set a weight value of 0.2 for the first test voltage V1 to the fifth test voltage V5, respectively.

[0091] In one embodiment, the dominant color determination unit 320 may set different weight values ​​for the first test voltage V1 to the fifth test voltage V5. The smaller the difference between the test voltage and the reference voltage, the larger the weight value may be set by the dominant color determination unit 320. Figure 4 , the dominant color determination unit 320 may set a weight value of 0.2 for the second test voltage V2 having a difference of 0.2 V from the fourth test voltage V4 as the reference voltage, and set a weight value of 0.1 for the first test voltage V1 having a difference of 0.3 V from the fourth test voltage V4. In addition, the dominant color determination unit 320 sets the largest weight value for the reference voltage V4 among the plurality of test voltages V1 to V5.

[0092] In addition, the dominant color determination unit 320 may set a larger weight value for a test voltage having a magnitude greater than the reference voltage than for a test voltage having a magnitude less than the reference voltage. Figure 4 Although the third test voltage V3 and the fifth test voltage V5 have the same difference (i.e., 0.1V) with the fourth test voltage V4 serving as the reference voltage, the dominant color determination unit 320 may set a weight value of 0.3 for the third test voltage V3 and a weight value of 0.1 for the fifth test voltage V5.

[0093] The dominant color determination unit 320 may generate a determination value by adding weight values ​​of the test voltages respectively located in each color region. For example, if the second test voltage V2 to the fifth test voltage V5 are located in the seventh region G, the dominant color determination unit 320 may generate a determination value of the seventh region G by adding weight values ​​set for the second test voltage V2 to the fifth test voltage V5. The determination value of the seventh region G may be 0.9. As described above, the dominant color determination unit 320 may determine the determination value corresponding to each color region based on the color region corresponding to the first test voltage V1 to the fifth test voltage V5.

[0094] If the first test voltage V1 is located in the fourth region D, the dominant color determination unit 320 may generate a determination value of the fourth region D based on the weight value set for the first test voltage V1. The determination value of the fourth region D may be 0.1.

[0095] The dominant color decision unit 320 may set a margin voltage for a portion of the first to third colors based on the margin voltage table TB stored in the storage medium 400 and the dominant color of the color region having the largest determination value among the first to seventh regions A to G.

[0096] The following Table 1 may be a tolerance voltage table TB stored in the storage medium 400. Table 1 shows the magnitude of the tolerance voltage for the first color, the magnitude of the tolerance voltage for the second color, and the magnitude of the tolerance voltage for the third color set according to the dominant color of the area with the largest determination value. In Table 1, the first color may be red, the second color may be green, and the third color may be blue.

[0097] [Table 1]

[0098]

[0099] Referring to Table 1, it can be seen that the magnitude of the margin voltage of the first color, the magnitude of the margin voltage of the second color, and the magnitude of the margin voltage of the third color are different according to the color region.

[0100] For example, refer to Figure 4 , the dominant color determination unit 320 may set the margin voltage for red based on the fact that the dominant color of the seventh region G having the largest determination value is red.

[0101] In more detail, if the region with the largest determination value is the seventh region G, the dominant color is red. The dominant color determination unit 320 sets a margin voltage of 0.3 V for the first color with reference to the seventh region G of Table 1. The dominant color determination unit 320 does not set a margin voltage for the second color and the third color or sets the margin voltage to 0 V.

[0102] If the region with the largest determination value is the fourth region D, the dominant color is yellow. The dominant color determination unit 320 sets a margin voltage of 0.3 V for the first color and the second color with reference to the fourth region D of Table 1. The dominant color determination unit 320 does not set a margin voltage for the third color or sets the margin voltage to 0 V.

[0103] The dominant color of the black image can be determined as described above, and the margin voltage can be selectively set for only a portion of the first to third colors based on the determined dominant color. For colors that do not require margin setting, the margin voltage can be set to zero or not. In this case, compared with the case where the same margin voltage is uniformly set for the first to third colors, the power consumed when representing the black image can be reduced.

[0104] Figure 6 It is a sequence diagram showing the operation of the margin voltage setting unit according to one embodiment of the present invention.

[0105] Reference Figure 3 and Figure 6 , shows a method for setting the margin voltage by the margin voltage setting unit 300. The margin voltage setting unit 300 may correspond to Figure 3 The margin voltage setting unit 300 is provided.

[0106] In step S110, the tolerance voltage setting section 300 may control the display driving section 200 to apply a test voltage to the display section 100, and set the reference voltage based on the brightness value measured by the measuring device 500. In one embodiment, the tolerance voltage setting section 300 may control the display driving section 200 to apply a plurality of test voltages to the display section 100, respectively, and set the test voltage corresponding to the brightness value most similar to the reference brightness among the plurality of brightness values ​​measured as the reference voltage.

[0107] In step S120, the margin voltage setting unit 300 may determine the color region for each test voltage. The margin voltage setting unit 300 may calculate the color coordinates of each test voltage in the CIE1931 color coordinate system and determine in which region each test voltage is located in the first region A to the seventh region G of the CIE1931 color coordinate system.

[0108] In step S130, the tolerance voltage setting unit 300 may set a weight value for each test voltage. In one embodiment, the tolerance voltage setting unit 300 may set the same weight value for each test voltage. In one embodiment, the tolerance voltage setting unit 300 may set different weight values ​​for each test voltage. For example, the smaller the difference between the test voltage and the reference voltage, the larger the weight value may be set for the test voltage.

[0109] In step S140 , the margin voltage setting section 300 may add weight values ​​of the test voltages located in the respective color regions to generate a determination value.

[0110] In step S150, the margin voltage setting unit 300 may set the margin voltage based on the dominant color of the region having the largest determination value. The margin voltage setting unit 300 may separately set the magnitude of the margin voltage for the first color, the magnitude of the margin voltage for the second color, and the magnitude of the margin voltage for the third color based on the dominant color.

[0111] The scope of the present invention is not limited to the contents described in the detailed description of the specification, but should be determined only by the claims. It should be interpreted that all changes or modifications derived from the meaning, scope and equivalent concepts of the claims are included in the scope of the present invention.

Claims

1. A display device, comprising: A display unit including pixels of a first color, a second color, and a third color; a data driving unit, supplying a plurality of test voltages to the pixels of the display unit through data lines, so that a test image is displayed through the display unit; as well as The margin voltage setting unit determines a dominant color based on the test image displayed on the display unit, and individually sets margin voltages corresponding to the first color to the third color based on the dominant color.

2. The display device according to claim 1, wherein: If the dominant color is the first color, the tolerance voltage setting unit only sets the size of the tolerance voltage of the first color; if the dominant color is the second color, the tolerance voltage setting unit only sets the size of the tolerance voltage of the second color; if the dominant color is the third color, the tolerance voltage setting unit only sets the size of the tolerance voltage of the third color.

3. The display device according to claim 1, wherein: The margin voltage setting unit determines color regions corresponding to the plurality of test voltages, respectively, among the plurality of color regions. generating a plurality of determination values ​​corresponding to the plurality of color areas respectively based on the determined color area, The dominant color is determined based on a color region having a maximum value among the plurality of determination values.

4. The display device according to claim 3, wherein: The tolerance voltage setting unit sets weight values ​​for the plurality of test voltages respectively. The margin voltage setting section generates the plurality of determination values ​​by adding weight values ​​of the test voltages respectively located in the plurality of color regions.

5. The display device according to claim 3, wherein: The tolerance voltage setting unit sets different weight values ​​for the plurality of test voltages respectively. The margin voltage setting unit sets a maximum weight value for a reference voltage among the plurality of test voltages.

6. The display device according to claim 5, wherein: The margin voltage setting unit sets a larger weight value as the difference between the magnitude of each of the plurality of test voltages and the magnitude of the reference voltage is smaller.

7. The display device according to claim 5, wherein: The margin voltage setting section sets, as the reference voltage, a test voltage corresponding to a luminance value having the smallest difference from a reference luminance among a plurality of luminance values ​​corresponding to the plurality of test images.

8. The display device according to claim 3, wherein: The margin voltage setting unit sets the same weight value for each of the plurality of test voltages.

9. The display device according to claim 3, wherein: The plurality of color regions are distinguished in the CIE 1931 color coordinate system.

10. The display device according to claim 1, wherein: The plurality of test voltages are voltages set to display a black image in the display device.

11. A method for operating a display device, the display device comprising pixels of a first color, a second color, and a third color, the method for operating the display device comprising: supplying a plurality of test voltages to the pixels to display a test image through the pixels; A step of determining color regions corresponding to the plurality of test voltages respectively among a plurality of color regions according to the test image; A step of generating a plurality of determination values ​​corresponding to the plurality of color areas, respectively, based on the determined color area; a step of determining a dominant color based on a color region having a maximum determination value among the plurality of determination values; as well as The step of setting a margin voltage based on the dominant color.

12. The operating method of the display device according to claim 11, wherein: The step of setting the margin voltage based on the dominant color includes the step of respectively setting the magnitude of the margin voltage of the first color, the magnitude of the margin voltage of the second color, and the magnitude of the margin voltage of the third color based on the dominant color.

13. The operating method of the display device according to claim 12, wherein: If the dominant color is the first color, only the size of the tolerance voltage of the first color is set; if the dominant color is the second color, only the size of the tolerance voltage of the second color is set; if the dominant color is the third color, only the size of the tolerance voltage of the third color is set.

14. The operating method of the display device according to claim 11, wherein: The step of generating the plurality of determination values ​​respectively corresponding to the plurality of color areas comprises: The step of respectively setting weight values ​​for the plurality of test voltages; and The step of adding weight values ​​of the test voltages respectively located in the plurality of color areas.

15. The operating method of the display device according to claim 14, wherein: The step of respectively setting weight values ​​for the plurality of test voltages includes: the step of respectively setting different weight values ​​for the plurality of test voltages.

16. The operating method of the display device according to claim 15, wherein: The step of setting different weight values ​​for the plurality of test voltages includes the step of setting a larger weight value as the difference between the magnitude of each of the plurality of test voltages and the magnitude of the reference voltage is smaller.

17. The operating method of the display device according to claim 16, further comprising: A step of receiving a plurality of brightness values ​​respectively corresponding to the plurality of test voltages; as well as The step of setting a test voltage corresponding to a brightness value having the smallest difference from a reference brightness among the plurality of brightness values ​​as the reference voltage.

18. The operating method of the display device according to claim 11, wherein: The step of respectively setting weight values ​​for the plurality of test voltages includes: the step of respectively setting the same weight value for the plurality of test voltages.

19. The operating method of the display device according to claim 11, wherein: The plurality of color regions are distinguished in the CIE 1931 color coordinate system.

20. The operating method of the display device according to claim 11, wherein: The plurality of test voltages are voltages set to display a black image in the display device.

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