Display device

Abstract

The present application relates to a display device. The display device includes a pixel portion. The pixel portion includes an object pixel and surrounding pixels located within a unit region set based on the object pixel. A conversion portion adjusts a voltage level of a data voltage for the object pixel based on a light emission state of the surrounding pixels, and determines a voltage level of a black voltage for at least one of the surrounding pixels that does not emit light based on the light emission state of the surrounding pixels. A data drive portion applies the data voltage to the object pixel and applies the black voltage to the at least one of the surrounding pixels that does not emit light.

Description

TECHNICAL FIELD

[0001] The present application relates to a display device and a driving method of the display device. BACKGROUND

[0002] An organic light emitting display device can include a plurality of pixels, and the organic light emitting diodes of the plurality of pixels are respectively caused to emit light based on a gray voltage corresponding to a gray value within image data, thereby displaying an image frame (or an image).

[0003] Generally, in a case where pixels of different colors from each other emit light in response to the same gray, white color light is emitted from the organic light emitting display device, and a gray voltage for the pixels is set so that the white color light has a luminance according to a preferred gamma curve.

[0004] In a case where the organic light emitting display device emits single color light or mixed color light other than white color light using a gray voltage, the luminance of the single color light or the mixed color light can not be completely consistent with the gamma curve. Also, in a case where the organic light emitting display device emits single color light, lateral leakage can occur, according to which the organic light emitting display device cannot emit light at a target luminance, wherein the lateral leakage indicates that holes of a driving current flowing through a corresponding pixel are leaked to surrounding pixels having small resistance through a P-doped Hole Injection Layer (PHIL layer) which is a layer shared as an organic light emitting diode. SUMMARY

[0005] An object of the present application is to provide a display device capable of emitting a target luminance not only when white color light is emitted but also when single color light and mixed color light are emitted, and a driving method of the display device.

[0006] A display device according to the present application includes a pixel portion including an object pixel and surrounding pixels located within a unit area set based on the object pixel, a conversion portion adjusting a voltage level of a data voltage for the object pixel based on an emission state of the surrounding pixels, determining a voltage level of a black voltage for at least one of the surrounding pixels which does not emit light based on the emission state of the surrounding pixels, and a data driving portion applying the data voltage to the object pixel and applying the black voltage to the at least one of the surrounding pixels which does not emit light.

[0007] In an embodiment, the object pixel can be a first color pixel emitting light in a first color, and the surrounding pixels include a second color pixel emitting light in a second color and a third color pixel emitting light in a third color.

[0008] In one embodiment, the first color can be one of red and green, the second color can be the other of red and green, and the third color can be blue, the conversion section changes a voltage level of a black voltage for the second color pixel based on the light emission state, and keeps a voltage level of a black voltage for the third color pixel constant, under a condition that luminance of the unit area is constant.

[0009] In one embodiment, the unit area can be an area within a first radius with the object pixel as a reference, the first radius corresponding to a distance between the object pixel and a first color pixel closest to the object pixel.

[0010] In one embodiment, the conversion section sets a second black voltage for the second color pixel to have a first voltage level in a case where it is determined that at least one of the second color pixels emits light, and sets the second black voltage to have a second voltage level in a case where it is determined that none of the second color pixels emits light.

[0011] In one embodiment, each of the object pixel and the surrounding pixels can include a light emitting element and a drive transistor that controls an amount of drive current flowing in the light emitting element in response to the data voltage, the drive transistor is implemented with a P-type transistor, and the second voltage level is higher than the first voltage level.

[0012] In one embodiment, the conversion section can include a grayscale conversion section that determines the light emission state of the surrounding pixels based on a reference grayscale value for the surrounding pixels, generates a corrected grayscale value by correcting an input grayscale value for the object pixel based on the light emission state of the surrounding pixels, and a black voltage conversion section that sets a black grayscale value representing a voltage level of the black voltage based on the light emission state of the surrounding pixels.

[0013] In one embodiment, the display device can further include a voltage generation section that generates reference gamma voltages and reference black voltages, wherein the data drive section selects one of the reference gamma voltages based on the corrected grayscale value, outputs the selected one of the reference gamma voltages as the data voltage, and selects one of the reference black voltages based on the black grayscale value, outputs the selected one of the reference black voltages as the black voltage.

[0014] In one embodiment, the gray scale conversion section can determine a color displayed in the unit area to be one of a single color, double mixed color, and triple mixed color based on the light emission state of the surrounding pixels, determine a black offset value for the at least one surrounding pixel that does not emit light in a case where the color displayed in the unit area is a single color or double mixed color, and calculate the black gray scale value based on the black offset value.

[0015] In one embodiment, the black voltage conversion section can include a black voltage offset setting section that determines the black offset value corresponding to the light emission state using a first lookup table, a black voltage leveling section that generates black gray scale values each corresponding to the reference black voltage, and a black voltage matching section that selects the black gray scale value corresponding to the black offset value from the black gray scale values.

[0016] In one embodiment, the black voltage conversion section can change the black offset value according to the brightness of the unit area.

[0017] In one embodiment, the object pixel can emit light in red, the surrounding pixels include a green pixel that emits light in green and a blue pixel that emits light in blue, and the black voltage offset setting section sets a black offset value of the green pixel to be greater than 0 in a case where the green pixel does not emit light.

[0018] In one embodiment, the black voltage offset setting section can set a black offset value of the blue pixel to be 0.

[0019] In one embodiment, the object pixel can emit light in blue, the surrounding pixels include a red pixel that emits light in red and a blue pixel that emits light in blue, and the black voltage offset setting section sets a black offset value of the red pixel to be greater than 0 in a case where the red pixel does not emit light.

[0020] In one embodiment, the pixel section can include a first unit area and a second unit area, the at least one surrounding pixel is located within the first unit area and the second unit area, and the black voltage conversion section further includes a repetition processing section that selects one of a first black voltage set for the at least one surrounding pixel with the first unit area as a reference and a second black voltage set for the at least one surrounding pixel with the second unit area as a reference, or averages the first black voltage and the second black voltage in a case where the first black voltage and the second black voltage are different.

[0021] In one embodiment, the gray scale converting section can calculate a number of the surrounding pixels that emit light among the surrounding pixels, determine an offset value based on the color and the number of the pixels, and calculate the corrected gray scale value by adding the offset value to the input gray scale value.

[0022] A display device according to an embodiment of the present invention includes: a pixel section including first color pixels that emit light in a first color and second color pixels that emit light in a second color within a unit area set based on the first color pixels; a converting section that adjusts a voltage level of a data voltage for the first color pixels based on an emission state of the second color pixels, sets a black voltage for the second color pixels to have a first voltage level in a case where at least one of the second color pixels emits light, and sets the black voltage to have a second voltage level in a case where none of the second color pixels emits light; and a data driving section that applies the black voltage to the second color pixels.

[0023] In one embodiment, the first color can be one of red and green, and the second color can be the other of red and green.

[0024] In one embodiment, each of the first color pixels and the second color pixels can include a light emitting element and a drive transistor that controls an amount of drive current flowing in the light emitting element in response to the data voltage, the drive transistor being implemented with a P-type transistor, and the second voltage level can be higher than the first voltage level.

[0025] A driving method of a display device according to an embodiment of the present invention is performed in a display device including an object pixel and surrounding pixels within a unit area set based on the object pixel. The driving method of the display device includes the steps of receiving an input gray scale value corresponding to the object pixel and observation gray scale values corresponding to the surrounding pixels, counting a number of the observation gray scale values that exceed a reference gray scale value to calculate a number of light emitting pixels of the surrounding pixels, determining a black voltage for the surrounding pixels based on the number of the light emitting pixels, and applying the black voltage to a non-light emitting surrounding pixel of the surrounding pixels, wherein the observation gray scale value of the non-light emitting surrounding pixel corresponds to a minimum gray scale within a gray scale range of the input gray scale value.

[0026] In one embodiment, the object pixel can be a first color pixel that emits light in a first color, the surrounding pixels can include second color pixels that emit light in a second color and third color pixels that emit light in a third color, and the step of calculating the number of the light emitting pixels can include the steps of calculating a first number of the light emitting pixels of the second color pixels, and calculating a second number of the light emitting pixels of the third color pixels.

[0027] In one embodiment, the first color may be one of red and green, the second color may be the other of red and green, and the third color may be blue. The step of determining the black voltage includes the following steps: under the condition that the brightness of the unit area is constant, variably setting the voltage level of the black voltage for the second color pixel based on the number of the first light-emitting pixels.

[0028] In one embodiment, the step of determining the black voltage may include the following steps: setting a black grayscale value for the surrounding pixels based on the number of luminous pixels, and the step of applying the black voltage includes the following steps: selecting one of the preset black voltages based on the black grayscale value and applying it to the non-luminous surrounding pixels.

[0029] In one embodiment, the display device may include a first unit area and a second unit area, and the non-luminous surrounding pixels are all located in the first unit area and the second unit area. The step of determining the black voltage includes the following steps: setting the first black voltage of the non-luminous surrounding pixels based on the first unit area; setting the second black voltage of the non-luminous surrounding pixels based on the second unit area; and when the first black voltage is different from the second black voltage, selecting one of the first black voltage and the second black voltage, or averaging the first black voltage and the second black voltage.

[0030] According to one embodiment of the present invention, a display device and a driving method thereof can correct the input grayscale value of a target pixel and change the black voltage (i.e., the data voltage supplied to non-luminous pixels) of the surrounding pixels based on the light-emitting state of surrounding pixels within a unit area set with respect to the target pixel. Consequently, side leakage can be prevented, and desired brightness can be achieved even when the unit area (or pixel) emits monochromatic light or mixed-color light.

[0031] The effects according to an embodiment of the present invention are not limited to the above examples, and more diverse effects are included in this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a block diagram illustrating a display device according to an embodiment of the present invention.

[0033] Figure 2 It shows Figure 1 A plan view of an example of a pixel portion included in a display device.

[0034] Figure 3 It shows Figure 1 A circuit diagram of an example of a pixel included in a display device.

[0035] Figure 4 is a waveform chart showing the operation of the pixel of Figure 3 .

[0036] Figure 5 is a block diagram showing an example of the display device of Figure 1 .

[0037] Figure 6 is a circuit diagram showing an example of the pixel included in the display device of Figure 5 .

[0038] Figure 7 is a waveform chart showing the operation of the pixel of Figure 6 .

[0039] Figure 8 is a diagram showing an example of the voltage generation section included in the display device of Figure 1 .

[0040] Figure 9 is a circuit diagram showing an example of the first voltage generation section included in the voltage generation section of Figure 8 .

[0041] Figure 10 is a diagram showing a luminance curve of white light according to a maximum luminance value.

[0042] Figure 11 is a diagram showing luminance curves of white light and monochromatic light.

[0043] Figure 12 is a block diagram showing an example of the conversion section included in the display device of Figure 1 .

[0044] Figure 13 is a diagram showing a plurality of examples of the light emission state of the pixel with reference to a first unit area.

[0045] Figure 14 is a diagram showing a plurality of examples of the light emission state of the pixel with reference to a second unit area.

[0046] Figure 15 is a diagram showing a plurality of examples of the light emission state of the pixel with reference to a third unit area.

[0047] Figure 16 is a block diagram showing an example of the offset setting section included in the conversion section of Figure 12 .

[0048] Figure 17 and Figure 18 are diagrams for explaining the monochromatic offset provision section included in the offset setting section of Figure 16 .

[0049] Figure 19 is a lookup table showing a normal black voltage of a pixel included in a display device according to Figure 1

[0050] Figure 20 is a lookup table showing a black offset of a pixel displaying a color in a unit area included in a display device according to Figure 1

[0051] Figure 21 is a diagram showing an example of a lookup table generated by a black voltage leveling section included in a conversion section of Figure 12

[0052] Figure 22 is a diagram for explaining an operation of a repetition processing section included in a conversion section of Figure 12

[0053] Figure 23 is a lookup table showing a black voltage finally set by a conversion section of Figure 12

[0054] Figure 24 is a flowchart showing a driving method of a display device according to an embodiment of the present application. DETAILED DESCRIPTION

[0055] Hereinafter, a plurality of embodiments of the present application will be explained in detail with reference to the accompanying drawings so that those having ordinary knowledge in the technical field to which the present application pertains can easily embody the present application. The present application can be implemented in various different forms and is not limited to the embodiments described herein.

[0056] For the sake of clear explanation of the present application, parts irrelevant to the explanation are omitted, and throughout the specification, the same or similar components are given the same reference numerals. Therefore, the reference numerals described above can be used for different drawings.

[0057] Also, for the sake of easy explanation, the sizes and thicknesses of the respective components shown in the drawings are arbitrarily shown, and therefore the present application is not limited to the contents shown in the drawings. In the drawings, the thicknesses are exaggerated for the sake of clear expression of a plurality of layers and regions.

[0058] Figure 1 is a block diagram showing a display device according to an embodiment of the present application.

[0059] Referring to Figure 1 ​​​​​The display device 10 can be connected to the processor 9 and includes a timing control unit 11, a data driving unit (or a source driver) 12, a scanning driving unit (or a gate driver) 13, a pixel unit (or a display panel) 14, a voltage generating unit 15 and a conversion unit (or a correction unit) 16.

[0060] The processor 9 may provide input image data and control signals for an image frame. The input image data may include grayscale values, and the control signals may include a vertical synchronization signal, a horizontal synchronization signal, and a clock signal. The processor 9 may include an application processor, a central processing unit (CPU), a graphics processing unit (GPU), and the like. The processor 9 may provide the display device 10 with grayscale values ​​that match the structure of the pixel portion 14 (e.g., an arrangement of pixels PX_T, PX_ADJ1, and PX_ADJ2, a pentile structure, or an RGB stripe structure). For example, the processor 9 may provide the display device 10 with grayscale values ​​that correspond one-to-one to the pixels PX_T, PX_ADJ1, and PX_ADJ2 included in the pixel portion 14. Alternatively, the processor 9 may provide the display device 10 with the grayscale values ​​of the pixel portion 14 regardless of the structure of the pixel portion 14. For example, the processor 9 may provide a red grayscale value, a green grayscale value, and a blue grayscale value for one dot, which is a basic unit for displaying full color. In this case, the number of grayscale values ​​provided by the processor 9 may be different from the number of pixels PX_T, PX_ADJ1, and PX_ADJ2 included in the pixel unit 14.

[0061] The timing control section 11 may receive input image data and control signals from the processor 9. When the input image data includes grayscale values ​​that match the structure of the pixel section 14, the timing control section 11 may transmit the grayscale values ​​to the conversion section 16. When the input image data includes grayscale values ​​that are unrelated to the structure of the pixel section 14, the timing control section 11 may render the grayscale values ​​to generate rendered grayscale values ​​that correspond one-to-one to the pixels included in the pixel section 14, and provide the rendered grayscale values ​​to the conversion section 16.

[0062] The conversion unit 16 can correct the grayscale value to generate a converted grayscale value. The conversion unit 16 will be described after the pixel unit 14.

[0063] The timing control section 11 can supply the conversion gradation value and a data control signal (for example, a data enable signal corresponding to a vertical start signal) to the data drive section 12. Also, the timing control section 11 can supply a scan control signal (for example, a clock signal, a scan start signal corresponding to a vertical start signal) to the scan drive section 13.

[0064] The data drive section 12 can generate a data voltage based on the conversion gradation value and the data control signal, and supply the data voltage to the data lines DL1, DL2, DL3, DLn (where n is a positive integer). For example, the data drive section 12 can sample the conversion gradation value with a clock signal, and supply a data voltage corresponding to the conversion gradation value to the data lines DL1, DL2, DL3, DLn in units of a pixel row. For example, the data drive section 12 can select one of the reference voltages RV1 to RV255, RV0_1 to RV0_256, GV1 to GV255, GV0_1 to GV0_256, BV1 to BV255, BV0_1 to BV0_256 supplied from the voltage generation section 15 based on one of the conversion gradation values, and output the selected one of the reference voltages RV1 to RV255, RV0_1 to RV0_256, GV1 to GV255, GV0_1 to GV0_256, BV1 to BV255, BV0_1 to BV0_256 as the data voltage.

[0065] The scan drive section 13 can generate a scan signal in accordance with the scan control signal, and supply the scan signal to the scan lines SL1, SL2, SL3, SLm (where m is a positive integer). For example, the scan drive section 13 can supply a scan signal having a pulse of an on level to the scan lines SL1, SL2, SL3, SLm in order. Here, the on level can be a voltage level that turns on a transistor. For example, the scan drive section 13 can be configured in a shift register form including a plurality of stage circuits, and generate a scan signal in a manner that a scan start signal having a pulse of an on level is sequentially transferred from a current stage circuit to a next stage circuit in response to a clock signal.

[0066] The pixel section 14 can include the pixels PX_T, PX_ADJ1, PX_ADJ2. Each of the pixels PX_T, PX_ADJ1, PX_ADJ2 can be connected to a corresponding data line and a scan line.

[0067] The pixel section 14 can include a first color pixel that emits light in a first color, a second color pixel that emits light in a second color, and a third color pixel that emits light in a third color. The first color, the second color, and the third color can be colors different from each other. For example, the first color can be one of red, green, and blue, the second color can be another of red, green, and blue, and the third color can be still another of red, green, and blue. Also, instead of red, green, and blue, magenta, cyan, and yellow can be used as the first color to the third color. However, for convenience of explanation, red, green, and blue are used as the first color to the third color, magenta is expressed in a combination of red and blue, cyan is expressed in a combination of green and blue, and yellow is expressed in a combination of red and green.

[0068] In the embodiment, the pixel section 14 can include a target pixel PX_T and surrounding pixels PX_ADJ1, PX_ADJ2. Here, the target pixel PX_T can be a pixel that serves as a reference when the conversion section 16 generates a conversion gray scale value, the surrounding pixels PX_ADJ1, PX_ADJ2 are pixels located within a unit region OA set with the target pixel PX_T as a reference, and the surrounding pixels PX_ADJ1, PX_ADJ2 are adjacent to the target pixel PX_T. No other pixel can be arranged between the target pixel PX_T and the surrounding pixels PX_ADJ1, PX_ADJ2, and the target pixel PX_T and the surrounding pixels PX_ADJ1, PX_ADJ2 are affected by mutual side leakage. For example, a drive current can leak from the light emitting diode of the target pixel PX_T to the surrounding pixels PX_ADJ1, PX_ADJ2, or a drive current can flow from the surrounding pixels PX_ADJ1, PX_ADJ2.

[0069] Hereinafter, the position of each of the pixels PX_T, PX_ADJ1, PX_ADJ2 is described with reference to the position of the light emitting diode (particularly, the light emitting layer). The position of the pixel circuit connected to each light emitting diode can not correspond to the position of the light emitting diode, and for space efficiency, can be appropriately arranged within the pixel section 14.

[0070] Hereinafter, the position of each of the pixels PX_T, PX_ADJ1, PX_ADJ2 is described with reference to the position of the light emitting diode (particularly, the light emitting layer). The position of the pixel circuit connected to each light emitting diode can not correspond to the position of the light emitting diode, and for space efficiency, can be appropriately arranged within the pixel section 14. Figure 2 The unit region OA, the target pixel PX_T, and the surrounding pixels PX_ADJ1, PX_ADJ2 are described.

[0071] The voltage generation section 15 can receive the input maximum luminance value DBV and provide the first reference voltages RV1 to RV255, RV0_1 to RV0_256 (or, first grayscale voltages, first gamma voltages) for the pixels of the first color, the second reference voltages GV1 to GV255, GV0_1 to GV0_256 for the pixels of the second color, and the third reference voltages BV1 to BV255, BV0_1 to BV0_256 for the pixels of the third color, which correspond to the input maximum luminance value DBV. Here, the first reference voltages RV1 to RV255, RV0_1 to RV0_256 can include first reference gamma voltages RV1 to RV255 and first reference black voltages RV0_1 to RV0_256, the first reference gamma voltages RV1 to RV255 correspond to the grayscale in the range of 1 to 255 among the grayscales in the range of 0 to 255, and one selected from the first reference black voltages RV0_1 to RV0_256 corresponds to the grayscale of 0. Similarly, the second reference voltages GV1 to GV255, GV0_1 to GV0_256 can include second reference gamma voltages GV1 to GV255 and second reference black voltages GV0_1 to GV0_256, and the third reference voltages BV1 to BV255, BV0_1 to BV0_256 can include third reference gamma voltages BV1 to BV255 and third reference black voltages BV0_1 to BV0_256.

[0072] For ease of explanation, it is explained that the grayscale values include a total of 256 grayscales from the grayscale of 0 (i.e., the minimum grayscale) to the grayscale of 255 (i.e., the maximum grayscale value), but is not limited thereto. For example, in a case where each of the grayscales is represented with 8 bits or more, there can be more grayscales. The minimum grayscale can be the darkest grayscale (e.g., black grayscale), and the maximum grayscale can be the brightest grayscale.

[0073] The maximum luminance value can be a luminance value of light emitted from the pixel section 14 (or, the unit area OA, the pixels PX_T, PX_ADJ1, PX_ADJ2) corresponding to the maximum grayscale. For example, in a case where the pixels of the first color constituting one dot emit light corresponding to the grayscale of 255, the pixels of the second color emit light corresponding to the grayscale of 255, and the pixels of the third color emit light corresponding to the grayscale of 255, the luminance value of light (i.e., white light) based on the combination of the first color to the third color can be the maximum luminance value. The unit of the luminance value can be nit.

[0074] Therefore, although the pixel section 14 can display an image frame that is locally (or, spatially) dark or bright, the maximum luminance of the image frame is limited to the maximum luminance value. The maximum luminance value can be manually set by a user's operation on the display device 10, or automatically set by an algorithm related to an illuminance sensor or the like. The maximum luminance value set in such a manner is denoted as an input maximum luminance value.

[0075] For example, the maximum value of the luminance can be 1200 nits, and the minimum value can be 4 nits. Even if the gray scale values are the same, if the input maximum luminance value DBV is different, the reference voltages RV1 to RV255, RV0_1 to RV0_256, GV1 to GV255, GV0_1 to GV0_256, BV1 to BV255, BV0_1 to BV0_256 generated by the voltage generation section 15 change, and in accordance therewith, the luminance of the pixel section 14 (or, the pixels PX_T, PX_ADJ1, PX_ADJ2) also changes.

[0076] The conversion section 16 can determine the emission state of the surrounding pixels PX_ADJ1, PX_ADJ2 based on the gray scale values of the surrounding pixels PX_ADJ1, PX_ADJ2 within the unit area OA, and generate a corrected gray scale value based on the emission state and the gray scale value for the target pixel PX_T. Hereinafter, for convenience of explanation, the gray scale value for the target pixel PX_T is referred to as an input gray scale value, and the gray scale value for the surrounding pixels PX_ADJ1, PX_ADJ2 is referred to as an observation gray scale value.

[0077] Further, the conversion section 16 can determine a black gray scale value (or, a black voltage) for at least one of the surrounding pixels PX_ADJ1, PX_ADJ2 that does not emit light, based on the emission state of the surrounding pixels PX_ADJ1, PX_ADJ2. Here, in the case where the surrounding pixels PX_ADJ1, PX_ADJ2 do not emit light, the black gray scale value is a gray scale value that indicates a voltage level of a data voltage (for example, a data voltage corresponding to the minimum gray scale) supplied to the surrounding pixels PX_ADJ1, PX_ADJ2 that do not emit light. Based on the black gray scale value, one of the black voltages RV0_1 to RV0_256, GV0_1 to GV0_256, BV0_1 to BV0_256 generated by the voltage generation section 15 can be selected, and the selected one of the black voltages is supplied as the data voltage to the corresponding pixel that does not emit light. The corrected gray scale value and the black gray scale value can be included in the conversion gray scale value. For example, the 8-bit corrected gray scale value and the 8-bit black gray scale value can be expressed as a 9-bit conversion gray scale value.

[0078] In the embodiment, the conversion section 16 can include a gray scale conversion section (or, a gray scale correction section) 161 and a black voltage conversion section (or, a black voltage correction section) 162.

[0079] The gray scale conversion section 161 can determine the light emission state (or the number of light-emitting pixels of each color) of the surrounding pixels PX ADJ1, PX ADJ2 within the unit region OA, respectively, and correct the input gray scale value for the target pixel PX_T based on the light emission state. Here, the light emission state respectively indicates whether the surrounding pixels PX ADJ1, PX ADJ2 emit light or not, and based on the light emission state, it is determined whether the unit region OA emits single color light, double mixed color light, triple mixed color light, or white color light.

[0080] The black voltage conversion section 162 can set the black gray scale value (or the voltage level of the black voltage) of the surrounding pixels PX ADJ1, PX ADJ2 based on the light emission state of the surrounding pixels PX ADJ1, PX ADJ2 within the unit region OA.

[0081] For example, in a case where the unit region OA includes first color pixels (e.g., red color pixels) and second color pixels (e.g., green color pixels), and at least one of the first color pixels emits light and all of the second color pixels do not emit light, the black voltage conversion section 162 can set the black gray scale value so that the black voltage for the second color pixels is relatively increased (i.e., higher than the black voltage when at least one of the second color pixels emits light). As another example, in a case where at least one of the second color pixels emits light and all of the first color pixels do not emit light within the unit region OA, the black voltage conversion section 162 can set the black gray scale value so that the black voltage for the first pixels is relatively increased (i.e., higher than the black voltage when at least one of the first color pixels emits light).

[0082] In addition, in a case where the unit region OA includes third color pixels (e.g., blue color pixels), the black voltage conversion section 162 can also set the black gray scale value so that the black voltage of the third color pixels remains constant under the same brightness condition regardless of the light emission state of the first color pixels and the second color pixels.

[0083] More specific configurations and operations of the conversion section 16 will be described later with reference to Figure 12 .

[0084] In addition, in a case where the unit region OA includes third color pixels (e.g., blue color pixels), the black voltage conversion section 162 can also set the black gray scale value so that the black voltage of the third color pixels remains constant under the same brightness condition regardless of the light emission state of the first color pixels and the second color pixels. Figure 1In the present embodiment, the conversion section 16 is illustrated as a configuration separate from the timing control section 11. However, according to the embodiment, at least a part of the conversion section 16 can be configured integrally with the timing control section 11. For example, at least a part of the conversion section 16 can also be configured in an integrated circuit form together with the timing control section 11. According to the embodiment, at least a part of the conversion section 16 can also be realized in a software form in the timing control section 11.

[0085] In another embodiment, at least a part of the conversion section 16 can also be configured in an integrated circuit form together with the data drive section 12. According to the embodiment, at least a part of the conversion section 16 can also be realized in a software form in the data drive section 12.

[0086] In yet another embodiment, at least a part of the conversion section 16 can also be configured in an integrated circuit form together with the processor 9.

[0087] As described with reference to Figure 1 , the display device 10 can correct the input gradation value of the object pixel PX_T based on the emission state of the surrounding pixels PX_ADJ1, PX_ADJ2 within the unit region OA set with the object pixel PX_T as a reference, and change the black voltage of the surrounding pixels PX_ADJ1, PX_ADJ2. Thereby, it is possible to prevent side leakage and emit a target luminance even in a case where the pixel section 14 displays an image of a single color light and a mixed color light.

[0088] Figure 2 is a plan view showing an example of a pixel section included in the display device of Figure 1 . Figure 2 A part of the pixel section 14 is exemplarily illustrated in

[0089] With reference to Figure 2 , the pixels RP22, RP26, RP44, RP62, RP66, RP84, GP11, GP13, GP15, GP17, GP31, GP33, GP35, GP37, GP51, GP53, GP55, GP57, GP71, GP73, GP75, GP77, BP24, BP42, BP46, BP64, BP82, BP86 are illustrated with positions of light emitting diodes as a reference, and the scan lines SL1 to SL8 and the data lines DL1 to DL7 are simplified for the purpose of illustrating an electrical connection relationship of the pixel section 14.

[0090] The pixels RP22, RP26, RP44, RP62, RP66, RP84, GP11, GP13, GP15, GP17, GP31, GP33, GP35, GP37, GP51, GP53, GP55, GP57, GP71, GP73, GP75, GP77, BP24, BP42, BP46, BP64, BP82, BP86 can include first color pixels RP22, RP26, RP44, RP62, RP66, RP84, second color pixels GP11, GP13, GP15, GP17, GP31, GP33, GP35, GP37, GP51, GP53, GP55, GP57, GP71, GP73, GP75, GP77, and third color pixels BP24, BP42, BP46, BP64, BP82, BP86.

[0091] The first color pixels RP22, RP26, RP44, RP62, RP66, RP84 emit light in a first color, for example, the first color can be red. The second color pixels GP11, GP13, GP15, GP17, GP31, GP33, GP35, GP37, GP51, GP53, GP55, GP57, GP71, GP73, GP75, GP77 emit light in a second color, for example, the second color can be green. The third color pixels BP24, BP42, BP46, BP64, BP82, BP86 emit light in a third color, for example, the third color can be blue.

[0092] In an embodiment, the first color pixels RP22, RP26, RP44, RP62, RP66, RP84, the second color pixels GP11, GP13, GP15, GP17, GP31, GP33, GP35, GP37, GP51, GP53, GP55, GP57, GP71, GP73, GP75, GP77, and the third color pixels BP24, BP42, BP46, BP64, BP82, BP86 can be arranged in an RGBG diamond pentile structure.

[0093] Each of the first color pixels RP22, RP26, RP44, RP62, RP66, RP84, the second color pixels GP11, GP13, GP15, GP17, GP31, GP33, GP35, GP37, GP51, GP53, GP55, GP57, GP71, GP73, GP75, GP77, and the third color pixels BP24, BP42, BP46, BP64, BP82, BP86 can be connected to a corresponding one of the scan lines SL1 to SL8 and a corresponding one of the data lines DL1 to DL7.

[0094] In addition, although Figure 2 In the drawing, the first odd-numbered scan lines SL1, SL3, SL5, SL7 are connected to the second color pixels GP11, GP13, GP15, GP17, GP31, GP33, GP35, GP37, GP51, GP53, GP55, GP57, GP71, GP73, GP75, GP77, and the second even-numbered scan lines SL2, SL4, SL6, SL8 are connected to the first color pixels RP22, RP26, RP44, RP62, RP66, RP84 and the third color pixels BP24, BP42, BP46, BP64, BP82, BP86, but the present application is not limited thereto. For example, the second scan line SL2 can be connected to the first scan line SL1, or the first scan line SL1 and the second scan line SL2 can be constituted by one scan line, and the same scan signal can be supplied to the first scan line SL1 and the second scan line SL2.

[0095] In the case where the forty-fourth pixel RP44 (i.e., the first color pixel disposed in the fourth row and the fourth column) is the object pixel PX_T described with reference to Figure 1 The first unit region ORA can be set as a region within a first radius with the forty-fourth pixel RP44 as a reference, and the surrounding pixels of the forty-fourth pixel RP44 include the twenty-fourth pixel BP24, the thirty-third pixel GP33, the thirty-fifth pixel GP35, the forty-second pixel BP42, the forty-sixth pixel BP46, the fifty-third pixel GP53, the fifty-fifth pixel GP55, and the sixty-fourth pixel BP64 within the first unit region ORA. For example, the first radius can correspond to a distance (e.g., a distance between pixel centers) from the forty-fourth pixel RP44 to the twenty-second pixel RP22 (or the twenty-sixth pixel RP26, the sixty-second pixel RP62, and the sixty-sixth pixel RP66) that emits light in the same color as the forty-fourth pixel RP44 and is adjacent to the forty-fourth pixel RP44.

[0096] In a case where the fifty-fifth pixel GP55 (i.e., the second color pixel arranged at the fifth row and the fifth column) is the target pixel PX_T, the second unit region OGA can be set as a region within a second radius from the fifty-fifth pixel GP55. For example, the second radius can correspond to a distance from the fifty-fifth pixel GP55 to the thirty-fifth pixel GP35 (or the fifty-third pixel GP53, the fifty-seventh pixel GP57, and the seventy-fifth pixel GP75) that emits light in the same color as the fifty-fifth pixel GP55 and is adjacent to the fifty-fifth pixel GP55. In this case, the surrounding pixels of the fifty-fifth pixel GP55 can include the forty-fourth pixel RP44, the forty-sixth pixel BP46, the sixty-fourth pixel BP64, and the sixty-sixth pixel RP66 within the second unit region OGA.

[0097] Similarly, in a case where the sixty-fourth pixel BP64 (i.e., the third color pixel arranged at the sixth row and the fourth column) is the target pixel PX_T, the third unit region OBA can be set as a region within a third radius from the sixty-fourth pixel BP64. For example, the third radius can correspond to a distance from the sixty-fourth pixel BP64 to the forty-second pixel BP42. In this case, the surrounding pixels of the sixty-fourth pixel BP64 can include the forty-fourth pixel RP44, the fifty-third pixel GP53, the fifty-fifth pixel GP55, the sixty-second pixel RP62, the sixty-sixth pixel RP66, the seventy-third pixel GP73, the seventy-fifth pixel GP75, and the eighty-fourth pixel RP84 within the third unit region OBA.

[0098] In addition, although Figure 2 The first color pixels RP22, RP26, RP44, RP62, RP66, RP84, the second color pixels GP11, GP13, GP15, GP17, GP31, GP33, GP35, GP37, GP51, GP53, GP55, GP57, GP71, GP73, GP75, GP77, and the third color pixels BP24, BP42, BP46, BP64, BP82, BP86 are illustrated in the RGBG diamond pentile structure, the present embodiment is not limited thereto. For example, the pixels can be arranged in other structures, such as an RGB-Stripe, an S-stripe, a Real RGB, a normal pentile, or the like. In this case, each of the unit regions ORA, OGA, OBA can be appropriately set to include the surrounding pixels that are arranged adjacent to the target pixel PX_T and emit light in a different color from the target pixel PX_T.

[0099] Figure 3It shows Figure 1 A circuit diagram of an example of a pixel included in a display device. Figure 4 It shows Figure 3 The waveform diagram of the pixel operation. Figure 1 The pixels PX_T, PX_ADJ1, and PX_ADJ2 shown are substantially the same or similar to each other, so the description will be made of the pixel PXij located in the i-th pixel row and the j-th pixel column, including the pixels PX_T, PX_ADJ1, and PX_ADJ2.

[0100] Reference Figure 3 and Figure 4 , the pixel PXij may include a first transistor T1, a second transistor T2, a storage capacitor Cst1 and a light emitting diode LD1.

[0101] The transistors may be P-type transistors, such as PMOS transistors, but are not limited thereto. For example, at least one of the transistors may also be an N-type transistor (eg, an NMOS transistor).

[0102] A first electrode of the first transistor T1 may be connected to a first power line ELVDD, a second electrode of the first transistor T1 may be connected to an anode electrode of a light emitting diode LD1 (or a light emitting element), and a gate electrode of the first transistor T1 may be connected to a second electrode of a second transistor T2. The first transistor T1 may be referred to as a driving transistor.

[0103] The first electrode of the second transistor T2 is connected to the data line DLj, the second electrode of the second transistor T2 is connected to the gate electrode of the first transistor T1, and the gate electrode of the second transistor T2 is connected to the scan line SLi. The second transistor T2 can be named a scan transistor, a switching transistor, etc.

[0104] The storage capacitor Cst1 may be connected or formed between the first electrode (or, the first power line ELVDD) and the gate electrode of the first transistor T1 .

[0105] The anode electrode of the light-emitting diode LD1 can be connected to the second electrode of the first transistor T1, and the cathode electrode of the light-emitting diode LD1 can be connected to the second power line ELVSS. The light-emitting diode LD1 can be an organic light-emitting diode (OLED) or an inorganic light-emitting diode (ILD) such as a micro-LED or a quantum dot light-emitting diode (QD). Furthermore, the light-emitting diode LD1 can also be a light-emitting element composed of a combination of organic and inorganic materials.Figure 3 The pixel PXij is illustrated as including a single light emitting diode LD1, but in another embodiment, the pixel PXij can also include a plurality of light emitting diodes. The plurality of light emitting diodes can be connected in parallel with each other, or connected in series.

[0106] If a scan signal of an on level (e.g., a low level) is supplied to the gate electrode of the second transistor T2 through the scan line SLi, the second transistor T2 can connect the data line DLj with one electrode of the storage capacitor Cst1. In this case, a voltage value according to a difference between the data voltage DATAij applied through the data line DLj and the first power voltage can be written to the storage capacitor Cst1. The data voltage DATAij can correspond to a reference voltage of the reference voltages RV1 to RV255, RV0_1 to RV0_256, GV1 to GV255, GV0_1 to GV0_256, BV1 to BV255, and BV0_1 to BV0_256. Figure 1 one of the illustrated reference voltages RV1 to RV255, RV0_1 to RV0_256, GV1 to GV255, GV0_1 to GV0_256, BV1 to BV255, and BV0_1 to BV0_256.

[0107] The first transistor T1 can flow a driving current corresponding to the voltage written to the storage capacitor Cst1 from the first power line ELVDD to the second power line ELVSS. In this case, the light emitting diode LD1 can emit light with a luminance according to the amount of the driving current.

[0108] Figure 5 is a block diagram illustrating an example of a display device of Figure 1

[0109] Referring to Figure 1 and Figure 5 , Figure 5 The display device 10' of Figure 1 The display device 10' of Figure 1 The display device 10' of

[0110] ​The light emission drive section 17 can receive a light emission control signal (e.g., a clock signal, a light emission stop signal) from the time series control section 11, generate a light emission signal based on the light emission control signal, and supply the light emission signal to the light emission lines EL1, EL2, EL3, ELo (where o is a positive integer). For example, the light emission drive section 17 can supply the light emission signal, which is a pulse having a cutoff level, to the light emission lines EL1, EL2, EL3, ELo in turn. For example, the light emission drive section 17 can be configured in the form of a shift register including a plurality of stages of circuits, and generate the light emission signal in a manner that the light emission stop signal in the form of a pulse having a cutoff level is sequentially transferred from a current stage of circuit to a next stage of circuit in response to a clock signal.

[0111] The pixel section 14' can include pixels PX_T', PX_ADJ1', PX_ADJ2'. Each of the pixels PX_T', PX_ADJ1', PX_ADJ2' can be connected to a corresponding data line, scan line, and light emission line.

[0112] Figure 6 is a circuit diagram illustrating an example of a pixel included in the display device of Figure 5 Figure 5 The pixels PX_T', PX_ADJ1', PX_ADJ2' illustrated in Figure 6 The pixels PX_T', PX_ADJ1', PX_ADJ2' are substantially the same as or similar to each other, and thus

[0113] Referring to Figure 6 The pixel PXij' can include thin film transistors M1, M2, M3, M4, M5, M6, M7, a storage capacitor Cst2, and a light emitting diode LD2.

[0114] The storage capacitor Cst2 can be connected or formed between the first power supply line ELVDD and a gate electrode of the first thin film transistor M1.

[0115] A first electrode of the first thin film transistor M1 can be connected to a second electrode of the fifth thin film transistor M5, a second electrode of the first thin film transistor M1 can be connected to a first electrode of the sixth thin film transistor M6, and a gate electrode of the first thin film transistor M1 can be connected to a second electrode of the storage capacitor Cst2. The first thin film transistor M1 can be named as a drive transistor. The first thin film transistor M1 can control an amount of drive current flowing between the first power supply line ELVDD and the second power supply line ELVSS according to a potential difference between the gate electrode and the first electrode (or, a source electrode).

[0116] ​The first electrode of the second thin film transistor M2 can be connected to the data line DLj, the second electrode of the second thin film transistor M2 can be connected to the first electrode of the first thin film transistor Ml, and the gate electrode of the second thin film transistor M2 can be connected to the current scan line SLi. The second thin film transistor M2 can input the data voltage of the data line DLj to the pixel PXij' if the scan signal of the on level is applied to the current scan line SLi.

[0117] The first electrode of the third thin film transistor M3 can be connected to the second electrode of the first thin film transistor Ml, the second electrode of the third thin film transistor M3 can be connected to the gate electrode of the first thin film transistor Ml, and the gate electrode of the third thin film transistor M3 can be connected to the current scan line SLi. The third thin film transistor M3 can connect the first thin film transistor Ml in a diode form if the scan signal of the on level is applied to the current scan line SLi.

[0118] The first electrode of the fourth thin film transistor M4 can be connected to the gate electrode of the first thin film transistor Ml, the second electrode of the fourth thin film transistor M4 can be connected to the initialization voltage line VINT, and the gate electrode of the fourth thin film transistor M4 can be connected to the previous scan line SL(i-1). The fourth thin film transistor M4 can transfer the initialization voltage to the gate electrode of the first thin film transistor Ml to initialize the amount of charge of the gate electrode of the first thin film transistor Ml if the scan signal of the on level is applied to the previous scan line SL(i-1). In another embodiment, the gate electrode of the fourth thin film transistor M4 can also be connected to a scan line different from the previous scan line SL(i-1).

[0119] The first electrode of the fifth thin film transistor M5 can be connected to the first power line ELVDD, the second electrode of the fifth thin film transistor M5 can be connected to the first electrode of the first thin film transistor Ml, and the gate electrode of the fifth thin film transistor M5 can be connected to the emission line ELi. The first electrode of the sixth thin film transistor M6 can be connected to the second electrode of the first thin film transistor Ml, the second electrode of the sixth thin film transistor M6 can be connected to the anode electrode of the light emitting diode LD2, and the gate electrode of the sixth thin film transistor M6 can be connected to the emission line ELi. The fifth thin film transistor M5 and the sixth thin film transistor M6 can be named as emission transistors. The fifth thin film transistor M5 and the sixth thin film transistor M6 can form a movement path of a driving current between the first power line ELVDD and the second power line ELVSS if the emission signal of the on level is applied to the emission line ELi. Accordingly, the light emitting diode LD2 can emit light in correspondence with the driving current.

[0120] The first electrode of the seventh thin film transistor M7 can be connected to the anode electrode of the light emitting diode LD2, the second electrode of the seventh thin film transistor M7 is connected to the initialization voltage line VINT, and the gate electrode of the seventh thin film transistor M7 is connected to the current scan line SLi. If the on-level scan signal is applied to the current scan line SLi, the seventh thin film transistor M7 can transfer the initialization voltage to the anode electrode of the light emitting diode LD2 to initialize the amount of charge accumulated in the light emitting diode LD2. In another embodiment, the gate electrode of the seventh thin film transistor M7 can also be connected to a scan line different from the current scan line SLi. For example, the gate electrode of the seventh thin film transistor M7 can also be connected to the previous scan line SL(i-1) or the previous previous scan line, the next scan line (the i+1 scan line) or the next next scan line.

[0121] The anode electrode of the light emitting diode LD2 can be connected to the second electrode of the sixth thin film transistor M6, and the cathode electrode of the light emitting diode LD2 can be connected to the second power supply line ELVSS.

[0122] For the explanation of the operation of the pixel PXij, reference can be made to Figure 7 .

[0123] Figure 7 is a waveform diagram showing the operation of the pixel of Figure 6 .

[0124] Referring to Figure 6 and Figure 7 , the on-level (for example, low level) scan signal can be applied to the previous scan line SL(i-1). In this case, the fourth thin film transistor M4 can be turned on, the initialization voltage is applied to the gate electrode of the first thin film transistor Ml, and the amount of charge of the gate electrode of the first thin film transistor Ml is initialized.

[0125] Since the emission line ELi is applied with the off-level emission signal, the fifth thin film transistor M5 and the sixth thin film transistor M6 are in the off state, and the light emitting diode LD2 can not emit light during the application of the initialization voltage.

[0126] Next, the data voltage DATAij for the current pixel row can be applied to the data line DLj, and the on-level scan signal is applied to the current scan line SLi. In this case, the second thin film transistor M2, the first thin film transistor Ml, and the third thin film transistor M3 can be in the on state, and the data line DLj is electrically connected with the gate electrode of the first thin film transistor Ml. Therefore, if the data voltage DATAij is applied to the second electrode of the storage capacitor Cst2, the amount of charge corresponding to the data voltage DATAij and the threshold voltage of the first thin film transistor Ml can be accumulated in the storage capacitor Cst2.

[0127] Also, the seventh thin film transistor M7 can be turned on in response to the scan signal of the on level, the anode electrode of the light emitting diode LD2 is connected to the initialization voltage line VINT, and the light emitting diode LD2 is precharged or initialized with the amount of charge corresponding to the voltage difference between the initialization voltage and the second power voltage.

[0128] Thereafter, the light emitting signal of the on level can be applied to the light emitting line ELi, so that the fifth thin film transistor M5 and the sixth thin film transistor M6 are turned on, the first thin film transistor M1 supplies the driving current corresponding to the amount of charge accumulated in the storage capacitor Cst2 to the light emitting diode LD2, and the light emitting diode LD2 emits light with the brightness corresponding to the driving current. The light emitting diode LD2 can emit light until the light emitting signal of the off level is applied to the light emitting line ELi.

[0129] As described with reference to Figure 5 to Figure 7 , the pixel PXij' can include, in addition to the first transistor M1 (i.e., the driving transistor) and the second transistor M2 (i.e., the switching transistor), the thin film transistors M3, M4, M5, M6, M7 that initialize the anode electrode of the light emitting diode LD2 or compensate for the data voltage DATAij or control the light emitting time (or, the light emitting duty ratio) of the light emitting diode LD2.

[0130] Figure 8 is a diagram showing an example of a voltage generation part included in the display apparatus of Figure 1 .

[0131] Referring to Figure 8 , the voltage generation part 15 can include a first voltage generation part (or, a first reference voltage generation part) 151, a second voltage generation part (or, a second reference voltage generation part) 152, and a third voltage generation part (or, a third reference voltage generation part) 153.

[0132] The first voltage generation part 151 can receive the input maximum luminance value DBV and generate the reference voltages RV1-RV255, RV0_1-RV0_256 for the first color pixels (e.g., the first color pixels RP22, RP26, RP44, RP62, RP66, RP84, refer to Figure 2 ) corresponding to the input maximum luminance value DBV.

[0133] Similarly, the second voltage generation section 152 can receive the input maximum luminance value DBV, and generate reference voltages GV1 to GV255, GV0_1 to GV0_256 for the second color pixels (for example, the second color pixels GP11, GP13, GP15, GP17, GP31, GP33, GP35, GP37, GP51, GP53, GP55, GP57, GP71, GP73, GP75, GP77, refer to FIG. 2) corresponding to the input maximum luminance value DBV. Figure 2 ) corresponding to the input maximum luminance value DBV.

[0134] The third voltage generation section 153 can receive the input maximum luminance value DBV, and generate reference voltages BV1 to BV255, BV0_1 to BV0_256 for the third color pixels (for example, the third color pixels BP24, BP42, BP46, BP64, BP82, BP86, refer to FIG. 2) corresponding to the input maximum luminance value DBV. Figure 2 ) corresponding to the input maximum luminance value DBV.

[0135] Figure 9 is a circuit diagram showing an example of the first voltage generation section included in the voltage generation section of Figure 8 Since the first voltage generation section 151, the second voltage generation section 152, and the third voltage generation section 153 shown in FIG. 15 are substantially the same or similar to each other, the first voltage generation section 151, the second voltage generation section 152, and the third voltage generation section 153 are collectively described, and the first voltage generation section 151 is described. Figure 8 Referring to

[0136] , the first voltage generation section 151 can include a selection value providing section 1511, a reference voltage output section 1512, resistor strings RS1 to RS11, multiplexers MX1 to MX12, and resistors R1 to R10. Figure 9 The selection value providing section 1511 can provide selection values for the multiplexers MX1 to MX12 according to the input maximum luminance value DBV. The selection values according to the input maximum luminance value DBV can be stored in advance in a memory element, for example, a register or the like. For example, the selection values (or, a lookup table including the selection values according to the input maximum luminance value DBV) can also be provided from the timing control section 11 together with the input maximum luminance value DBV.

[0137]

[0138] ​The first resistor string RS1 can generate intermediate voltages between the first reference voltage VH and the second reference voltage VL. The first multiplexer MX1 can output a third reference voltage VT by selecting one of the intermediate voltages provided from the first resistor string RS1 according to a selection value. The second multiplexer MX2 can output a second two hundred fifty-fifth reference gamma voltage RV255 by selecting one of the intermediate voltages provided from the first resistor string RS1 according to a selection value.

[0139] The eleventh resistor string RS11 can generate intermediate voltages between the third reference voltage VT and the second two hundred fifty-fifth reference gamma voltage RV255. The twelfth multiplexer MX12 can output a second two hundred third reference gamma voltage RV203 by selecting one of the intermediate voltages provided from the eleventh resistor string RS11 according to a selection value.

[0140] The tenth resistor string RS10 can generate intermediate voltages between the third reference voltage VT and the second two hundred third reference gamma voltage RV203. The eleventh multiplexer MX11 can output a first two hundred fifty-first reference gamma voltage RV151 by selecting one of the intermediate voltages provided from the tenth resistor string RS10 according to a selection value.

[0141] The ninth resistor string RS9 can generate intermediate voltages between the third reference voltage VT and the first two hundred fifty-first reference gamma voltage RV151. The tenth multiplexer MX10 can output an eighty-seventh reference gamma voltage RV87 by selecting one of the intermediate voltages provided from the ninth resistor string RS9 according to a selection value.

[0142] The eighth resistor string RS8 can generate intermediate voltages between the third reference voltage VT and the eighty-seventh reference gamma voltage RV87. The ninth multiplexer MX9 can output a fifty-first reference gamma voltage RV51 by selecting one of the intermediate voltages provided from the eighth resistor string RS8 according to a selection value.

[0143] The seventh resistor string RS7 can generate intermediate voltages between the third reference voltage VT and the fifty-first reference gamma voltage RV51. The eighth multiplexer MX8 can output a thirty-fifth reference gamma voltage RV35 by selecting one of the intermediate voltages provided from the seventh resistor string RS7 according to a selection value.

[0144] The sixth resistor string RS6 can generate intermediate voltages between the third reference voltage VT and the thirty-fifth reference gamma voltage RV35. The seventh multiplexer MX7 can output a twenty-third reference gamma voltage RV23 by selecting one of the intermediate voltages provided from the sixth resistor string RS6 according to a selection value.

[0145] The fifth resistor string RS5 can generate intermediate voltages between the third reference voltage VT and the twenty-third reference gamma voltage RV23. The sixth multiplexer MX6 can output an eleventh reference gamma voltage RV11 by selecting one of the intermediate voltages provided from the fifth resistor string RS5 according to a selection value.

[0146] The fourth resistor string RS4 can generate intermediate voltages between the first reference voltage VH and the eleventh reference gamma voltage RV11. The fifth multiplexer MX5 can output a seventh reference gamma voltage RV7 by selecting one of the intermediate voltages provided from the fourth resistor string RS4 according to a selection value.

[0147] The third resistor string RS3 can generate intermediate voltages between the first reference voltage VH and the seventh reference gamma voltage RV7. The fourth multiplexer MX4 can output a first reference gamma voltage RV1 by selecting one of the intermediate voltages provided from the third resistor string RS3 according to a selection value.

[0148] The second resistor string RS2 can generate intermediate voltages between the first reference voltage VH and the first reference gamma voltage RV1. The third multiplexer MX3 can output a zeroth reference gamma voltage RV0 (or, a reference black voltage) by selecting one of the intermediate voltages provided from the second resistor string RS2 according to a selection value.

[0149] The gray scales corresponding to the above-described zeroth reference gamma voltage RV0, the first reference gamma voltage RV1, the seventh reference gamma voltage RV7, the eleventh reference gamma voltage RV11, the twenty-third reference gamma voltage RV23, the thirty-fifth reference gamma voltage RV35, the fifty-first reference gamma voltage RV51, the eighty-seventh reference gamma voltage RV87, the one hundred fifty-first reference gamma voltage RV151, the two hundred third reference gamma voltage RV203, and the two hundred fifty-fifth reference gamma voltage RV255 can be named representative gray scales. Also, the reference gamma voltages RV0, RV1, RV7, RV11, RV23, RV35, RV51, RV87, RV151, RV203, and RV255 output from the multiplexers MX2 to MX12 can be named representative gamma voltages. The number of representative gray scales and the gray scale numbers corresponding to the representative gray scales can be set differently according to the display device 10 (refer to FIG. 1). Figure 1

[0150] ​The reference voltage output section 1512 can divide the first reference voltage VH and the zeroth reference gamma voltage RV0, the first reference gamma voltage RV1, the seventh reference gamma voltage RV7, the eleventh reference gamma voltage RV11, the twenty-third reference gamma voltage RV23, the thirty-fifth reference gamma voltage RV35, the fifty-first reference gamma voltage RV51, the eighty-seventh reference gamma voltage RV87, the one hundred fifty-first reference gamma voltage RV151, the two hundred third reference gamma voltage RV203, and the two hundred fifty-fifth reference gamma voltage RV255 to generate the reference gamma voltages RV1 to RV255 and the reference black voltages RV0_1 to RV0_256. For example, the reference voltage output section 1512 can divide the first reference gamma voltage RV1 and the seventh reference gamma voltage RV7 to generate the second reference gamma voltage RV2 to the sixth reference gamma voltage RV6. For example, the reference voltage output section 1512 can divide the first reference voltage VH and the zeroth reference gamma voltage RV0 to generate the first reference black voltage RV0_1 to the two hundred fifty-sixth reference black voltage RV0_256.

[0151] As described with reference to Figure 9 , the first voltage generation section 151 can generate not only the reference gamma voltages RV1 to RV255 but also the plurality of reference black voltages RV0_1 to RV0_256.

[0152] Figure 10 is a graph showing a luminance curve of white light according to a maximum luminance value.

[0153] With reference to Figure 10 , each of the luminance curves WC1, WC2, WC(k-1), WCk (where k is a positive integer) (or, reference luminance curves) represents a luminance according to an input gray value.

[0154] The maximum luminance values of the luminance curves WC1, WC2, WC(k-1), WCk can be different from each other. For example, the maximum luminance value of the first luminance curve WC1 (e.g., 4 nits) can be the lowest, and the maximum luminance value of the kth luminance curve WCk (e.g., 1200 nits) can be the highest.

[0155] In addition, in order to generate white light, it is assumed that a data voltage for the same gray is supplied to the pixels of the pixel section 14 (refer to Figure 1 ).

[0156] The imaginary dots on the luminance curves WC1, WC2, WC(k-1), WCk can correspond to the data voltages for the same gray with reference to Figure 9The selection values of the reference gamma voltages explained above can be pre-stored and used, and the remaining reference voltages can be generated by dividing the pre-stored reference gamma voltages. Also, for the same reason, the selection values of a part of the maximum luminance values (e.g., reference maximum luminance values) between 4 nit and 1200 nit can be pre-stored and used, and the remaining maximum luminance values can be generated by interpolating the pre-stored selection values. Figure 9 The selection values of a part of the reference gamma voltages (i.e., for the reference gamma voltages representing the gray scale) explained above can be pre-stored and used, and the remaining reference voltages can be generated by dividing the pre-stored reference gamma voltages. Also, for the same reason, the selection values of a part of the maximum luminance values (e.g., reference maximum luminance values) between 4 nit and 1200 nit can be pre-stored and used, and the remaining maximum luminance values can be generated by interpolating the pre-stored selection values.

[0157] The pre-stored selection values can be set for each display device 10 by multi-time programming (MTP). That is, the selection values can be repeatedly measured and stored in the display device 10 so that the white light of the target luminance can be emitted for the gray scale values.

[0158] As described above, the pre-stored selection values can be values set based on the white light. In the case where the mixed color light or the monochromatic light other than the white light is emitted using the set reference gamma voltages, the luminance thereof can not be completely identical to the desired luminance curve (or, gamma curve). Also, since an error occurs in the luminance curve of the monochromatic light, the color coordinates of the mixed color light or the monochromatic light can not be identical to the desired color coordinates.

[0159] To explain the error of the luminance curve of the monochromatic light based on the luminance curve of the white light, the luminance curve of the white light can be referred to as Figure 11 .

[0160] Figure 11 is a graph showing the luminance curves of the white light and the monochromatic light.

[0161] Referring to Figure 11 , the first color luminance curve RWC is a luminance curve of light for a first color (e.g., red), the second color luminance curve GWC is a luminance curve of light for a second color (e.g., green), and the third color luminance curve BWC represents a luminance curve of light for a third color (e.g., blue).

[0162] For reference, the luminance curve can be generally expressed as the following mathematical formula 1.

[0163] [mathematical formula 1]

[0164] y = ax GM +b

[0165] Here, x is an input grayscale value, y is a luminance value, a and b are constants, and GM is a gamma value.

[0166] Hereinafter, for convenience of explanation, the constants a and b are ignored, and the shape of the luminance curve is explained using the gamma value GM. In the case where the gamma value is 1, the luminance curve can have a straight line shape, not a curve shape, and the greater the gamma value is than 1, the more the luminance curve has a convex shape close to the horizontal axis.

[0167] The gamma value of the first color luminance curve RWC can be greater than the gamma value of the luminance curve WC (i.e., the luminance curve of white light). Also, the gamma value of the second color luminance curve GWC can be greater than the gamma value of the luminance curve WC and less than the gamma value of the first color luminance curve RWC. Also, the gamma value of the third color luminance curve BWC can be less than or similar to the gamma value of the luminance curve WC.

[0168] Accordingly, the display device 10 (refer to Figure 1 ) according to an embodiment of the present application can compensate for an input grayscale value so that a pixel emits light at the same luminance in the case where single color light is emitted and in the case where white light is emitted. Also, in order to prevent luminance variation (or, color coordinate variation) due to side leakage, the display device 10 can change a data voltage (i.e., a black voltage) corresponding to a minimum grayscale.

[0169] For example, the display device 10 can confirm whether a unit area emits single color light, double mixed color light, triple mixed color light, or white color light, correct an input grayscale value according to the case, and adjust a black voltage provided to a non-emitting pixel.

[0170] Referring to Figure 11 , for example, the display device 10 can reduce the gamma value of the first color luminance curve RWC by correcting an input grayscale value, according to which the first color luminance curve RWC is corrected to be similar to the luminance curve WC.

[0171] Similarly, the display device 10 can reduce the gamma value of the second color luminance curve GWC by correcting an input grayscale value, according to which the second color luminance curve GWC is adjusted to be similar to the luminance curve WC. Here, the amount of reduction in the gamma value of the second color luminance curve GWC can be less than the amount of reduction in the gamma value of the first color luminance curve RWC.

[0172] The display device 10 can increase the gamma value of the third color luminance curve BWC by correcting the input gray value, and the third color luminance curve BWC can be adjusted to be similar to the luminance curve WC.

[0173] Therefore, the luminance of the single color light can be accurately represented according to the desired gamma curve. Also, in the low gray region, as the luminance variation amount according to the input gray value increases, the low gray representation can become clearer.

[0174] This correction of the input gray value can also be applied to the case of the double mixed color light and the triple mixed color light. Therefore, the display device 10 can adjust the luminance curve for the double mixed color light to be similar to the luminance curve WC by correcting the input gray value. Also, the display device 10 can adjust the luminance curve for the triple mixed color light to be similar to the luminance curve WC by correcting the input gray value.

[0175] However, in the case of the white light, since the selection value has been set according to the white light, there is no need to separately perform the gray correction.

[0176] Figure 12 is a block diagram showing an example of a conversion section included in the display device Figure 1 .

[0177] Referring to Figure 1 and Figure 12 , the conversion section 16 can include a gray conversion section 161 and a black voltage conversion section 162.

[0178] The gray conversion section 161 can include a data input section 1611, a surrounding pixel state observation section 1612, an offset setting section 1613, and a data output section 1614.

[0179] The data input section 1611 can receive the gray value GRAY (or, input image data), and extract the gray values for the surrounding pixels PX_ADJ1, PX_ADJ2 within the unit area OA, i.e., the observation gray values GRAY_ADJ.

[0180] The data input section 1611 can sequentially extract and output the observation gray values GRAY_ADJ corresponding to the unit areas ORA, OGA, OBA described with reference to Figure 2 .

[0181] The surrounding pixel state observation section 1612 can determine the light emission states of the surrounding pixels PX_ADJ1, PX_ADJ2 based on the observation gray values GRAY_ADJ, respectively. Also, the surrounding pixel state observation section 1612 can determine whether the color displayed by the unit area OA is a single color, a double mixed color, or a triple mixed color based on the light emission states of the surrounding pixels PX_ADJ1, PX_ADJ2.

[0182] For example, the surrounding pixel state observation section 1612 can determine whether the first observation gray value is greater than the reference gray value (for example, a gray value of 0) in the observation gray value GRAY ADJ, determine that the corresponding surrounding pixel emits light (or is in a light-emitting state) in a case where the first observation gray value is greater than the reference gray value, and determine that the corresponding surrounding pixel does not emit light (or is in a non-light-emitting state) in a case where the first observation gray value is less than or equal to the reference gray value. For example, the surrounding pixel state observation section 1612 can calculate the number of light-emitting pixels for each color.

[0183] Accordingly, the surrounding pixel state observation section 1612 can divide the light-emitting state of the first unit area ORA (or the surrounding pixels in the first unit area ORA) described above into 25 cases, divide the light-emitting state of the second unit area OGA into 9 cases, and divide the light-emitting state of the third unit area OBA into 25 cases. Figure 2 The surrounding pixel state observation section 1612 can output state information STATUS indicating the corresponding case for each of the unit areas ORA, OGA, and OBA.

[0184] To explain the light-emitting state of the unit areas ORA, OGA, and OBA, reference can be made to FIG. 12. Figure 13 to Figure 15 After explaining the light-emitting state of the unit areas ORA, OGA, and OBA, the offset setting section 1613, the data output section 1614, and the black voltage conversion section 162 will be described. Figure 13 to Figure 15 After explaining the light-emitting state of the unit areas ORA, OGA, and OBA, the offset setting section 1613, the data output section 1614, and the black voltage conversion section 162 will be described.

[0185] Figure 13 FIG. 12 is a diagram showing various examples of the light-emitting state of a pixel with reference to the first unit area. Figure 13 FIG. 13 shows the light-emitting state of the unit areas ORA, OGA, and OBA with reference to the second unit area. Figure 2The 25 cases of the emission state of the surrounding pixels (i.e., the twenty-fourth pixel BP24, the thirty-third pixel GP33, the thirty-fifth pixel GP35, the forty-second pixel BP42, the forty-sixth pixel BP46, the fifty-third pixel GP53, the fifty-fifth pixel GP55, and the sixty-fourth pixel BP64) in the illustrated first unit region ORA (i.e., the first unit region ORA set with the forty-fourth pixel RP44 as a reference) are shown. The pixels (i.e., the twenty-fourth pixel BP24, the thirty-third pixel GP33, the thirty-fifth pixel GP35, the forty-second pixel BP42, the forty-sixth pixel BP46, the fifty-third pixel GP53, the fifty-fifth pixel GP55, and the sixty-fourth pixel BP64) that emit light in the surrounding pixels (i.e., the twenty-fourth pixel BP24, the thirty-third pixel GP33, the thirty-fifth pixel GP35, the forty-second pixel BP42, the forty-sixth pixel BP46, the fifty-third pixel GP53, the fifty-fifth pixel GP55, and the sixty-fourth pixel BP64) are illustrated as including a pattern, and the pixels (i.e., the twenty-fourth pixel BP24, the thirty-third pixel GP33, the thirty-fifth pixel GP35, the forty-second pixel BP42, the forty-sixth pixel BP46, the fifty-third pixel GP53, the fifty-fifth pixel GP55, and the sixty-fourth pixel BP64) that do not emit light in the surrounding pixels (i.e., the twenty-fourth pixel BP24, the thirty-third pixel GP33, the thirty-fifth pixel GP35, the forty-second pixel BP42, the forty-sixth pixel BP46, the fifty-third pixel GP53, the fifty-fifth pixel GP55, and the sixty-fourth pixel BP64) are illustrated as not including a pattern.

[0186] Referring to Figure 12 and Figure 13 In the eleventh case R1_G0B4, the second color pixels (i.e., the thirty-third pixel GP33, the thirty-fifth pixel GP35, the fifty-third pixel GP53, and the fifty-fifth pixel GP55) can all be in a non-emission state, and the third color pixels (i.e., the twenty-fourth pixel BP24, the forty-second pixel BP42, the forty-sixth pixel BP46, and the sixty-fourth pixel BP64) all be in an emission state. That is, the number of emissions of the second color pixels can be 0, and the number of emissions of the third color pixels is 4.

[0187] In the twelfth case R1_G1B4, only one (for example, the thirty-third pixel GP33) of the second color pixels (i.e., the thirty-third pixel GP33, the thirty-fifth pixel GP35, the fifty-third pixel GP53, and the fifty-fifth pixel GP55) can be in an emission state, and the third color pixels all be in an emission state. That is, the number of emissions (i.e., the number of pixels that emit light) of the second color pixels can be 1, and the number of emissions of the third color pixels is 4.

[0188] In the thirteenth case R1_G2B4, only two (for example, the thirty-third pixel GP33 and the thirty-fifth pixel GP35) of the second color pixels (i.e., the thirty-third pixel GP33, the thirty-fifth pixel GP35, the fifty-third pixel GP53, and the fifty-fifth pixel GP55) can be in an emission state, and the third color pixels all be in an emission state. That is, the number of emissions of the second color pixels can be 2, and the number of emissions of the third color pixels is 4.

[0189] In the fourteenth case R1_G3B4, the number of light emissions of the second color pixel can be 3, and the number of light emissions of the third color pixel is 4.

[0190] In the fifteenth case R1_G4B4, the number of light emissions of the second color pixel can be 4, and the number of light emissions of the third color pixel is 4.

[0191] Similarly, in the twenty-first case R1_G0B3, the twenty-second case R1_G1B3, the twenty-third case R1_G2B3, the twenty-fourth case R1_G3B3, and the twenty-fifth case R1_G4B3 located in the second row, the number of light emissions of the third color pixel can be 3, and the number of light emissions of the second color pixel is 0, 1, 2, 3, 4, respectively.

[0192] In the thirty-first case R1_G0B2, the thirty-second case R1_G1B2, the thirty-third case R1_G2B2, the thirty-fourth case R1_G3B2, and the thirty-fifth case R1_G4B2 located in the third row, the number of light emissions of the third color pixel can be 2, and the number of light emissions of the second color pixel is 0, 1, 2, 3, 4, respectively.

[0193] In the forty-first case R1_G0B1, the forty-second case R1_G1B1, the forty-third case R1_G2B1, the forty-fourth case R1_G3B1, and the forty-fifth case R1_G4B1 located in the fourth row, the number of light emissions of the third color pixel can be 1, and the number of light emissions of the second color pixel is 0, 1, 2, 3, 4, respectively.

[0194] In the fifty-first case R1_G0B0, the fifty-second case R1_G1B0, the fifty-third case R1_G2B0, the fifty-fourth case R1_G3B0, and the fifty-fifth case R1_G4B0 located in the fifth row, the number of light emissions of the third color pixel can be 0, and the number of light emissions of the second color pixel is 0, 1, 2, 3, 4, respectively.

[0195] In the fifty-first case R1_G0B0 located in the first column and the fifth row, a single color can be displayed in the first unit area ORA, for example, red color can be displayed in the first unit area ORA.

[0196] In the eleventh case R1_G0B4, the twenty-first case R1_G0B3, the thirty-first case R1_G0B2, and the forty-first case R1_G0B1 included in the first column, a double mixed color (i.e., a mixed color of the first color and the third color) can be displayed in the first unit area ORA, for example, a magenta color can be displayed in the first unit area ORA.

[0197] In the fifty-second case R1_G1B0, the fifty-third case R1_G2B0, the fifty-fourth case R1_G3B0, and the fifty-fifth case R1_G4B0 included in the fifth row, dual mixed color (ie, a mixed color of the first color and the second color) may be displayed in the first unit area ORA. For example, yellow may be displayed in the first unit area ORA.

[0198] In the case where a portion where the first to fourth rows intersect the second to fifth columns is included, triple mixed color or white may be displayed in the first unit area ORA.

[0199] Figure 14 1 and 2 are diagrams showing various examples of light-emitting states of pixels based on the second unit region. Figure 14 Shows about Figure 2 The shown figures show 9 situations of the luminous states of the surrounding pixels (i.e., the 44th pixel RP44, the 46th pixel BP46, the 64th pixel BP64 and the 66th pixel RP66) in the second unit area OGA (i.e., the second unit area OGA set based on the 55th pixel GP55).

[0200] Reference Figure 12 and Figure 14 In the eleventh situation G1_B2R0, all the third color pixels (i.e., the 46th pixel BP46 and the 64th pixel BP64) can be in a light-emitting state, and all the first color pixels (i.e., the 44th pixel RP44 and the 66th pixel RP66) can be in a non-light-emitting state. That is, the number of third color pixels that emit light can be 2, and the number of first color pixels that emit light can be 0.

[0201] In the twelfth situation G1_B2R1, all the third color pixels may be in a light-emitting state, and only one of the first color pixels (i.e., the 44th pixel RP44 and the 66th pixel RP66) (e.g., the 44th pixel RP44) may be in a light-emitting state. That is, the number of third color pixels that emit light may be 2, and the number of first color pixels that emit light may be 1.

[0202] In the thirteenth situation G1_B2R2, all the third color pixels may be in the light-emitting state, and all the first color pixels may be in the light-emitting state. That is, the number of light-emitting third color pixels may be 2, and the number of light-emitting first color pixels may be 2.

[0203] Similarly, in the twenty-first case G1_B1R0 , the twenty-second case G1_B1R1 , and the twenty-third case G1_B1R2 located in the second row, the number of the third color pixel emitting light may be 1, and the number of the first color pixel emitting light may be 0, 1, and 2, respectively.

[0204] In the thirty-first case G1_B0R0, the thirty-second case G1_B0R1, and the thirty-third case G1_B0R2 located in the third row, the number of light emissions of the third color pixels can be 0, and the number of light emissions of the first color pixels is 0, 1, and 2, respectively.

[0205] In the thirty-first case G1_B0R0 located in the first column and the third row, a single color can be displayed in the second unit region OGA, for example, green is displayed in the second unit region OGA.

[0206] In the eleventh case G1_B2R0 and the twenty-first case G1_B1R0 included in the first column, a double mixed color (i.e., a mixed color of the second color and the third color) can be displayed in the second unit region OGA, for example, cyan is displayed.

[0207] In the thirty-second case G1_B0R1 and the thirty-third case G1_B0R2 included in the third row, a double mixed color (i.e., a mixed color of the second color and the first color) can be displayed in the second unit region OGA, for example, yellow is displayed.

[0208] In addition, in the cases included in the portions where the first row and the second row intersect with the second column and the third column, a triple mixed color or white can be displayed in the first unit region ORA.

[0209] Figure 15 is a diagram showing various examples of the light emission state of the pixels with the third unit region as a reference. Figure 15 is shown in FIG. 6. Figure 2 The 25 cases of the light emission state of the surrounding pixels (i.e., the forty-fourth pixel RP44, the fifty-third pixel GP53, the fifty-fifth pixel GP55, the sixty-second pixel RP62, the sixty-sixth pixel RP66, the seventy-third pixel GP73, the seventy-fifth pixel GP75, and the eighty-fourth pixel RP84) within the third unit region OBA (i.e., the third unit region OBA set with the sixty-fourth pixel BP64 as a reference) are shown.

[0210] Referring to FIG. 6, Figure 12 and Figure 15 In the eleventh case B1_R0G4, the first color pixels (i.e., the forty-fourth pixel RP44, the sixty-second pixel RP62, the sixty-sixth pixel RP66, and the eighty-fourth pixel RP84) can all be in a non-light emission state, and the second color pixels (i.e., the fifty-third pixel GP53, the fifty-fifth pixel GP55, the seventy-third pixel GP73, and the seventy-fifth pixel GP75) are all in a light emission state. That is, the number of light emissions of the first color pixels can be 0, and the number of light emissions of the second color pixels is 4.

[0211] In a twelfth case B1_R1G4, only one of the first color pixels (e.g., the forty-fourth pixel RP44) can be in the light emitting state, and all of the second color pixels are in the light emitting state. That is, the number of light emitting of the first color pixels can be 1, and the number of light emitting of the second color pixels is 4.

[0212] In a thirteenth case B1_R2G4, only two of the first color pixels (e.g., the forty-fourth pixel RP44 and the sixty-sixth pixel RP66) can be in the light emitting state, and all of the second color pixels are in the light emitting state. That is, the number of light emitting of the first color pixels can be 2, and the number of light emitting of the second color pixels is 4.

[0213] In a fourteenth case B1_R3G4, the number of light emitting of the first color pixels can be 3, and the number of light emitting of the second color pixels is 4.

[0214] In a fifteenth case B1_R4G4, the number of light emitting of the first color pixels can be 4, and the number of light emitting of the second color pixels is 4.

[0215] Similarly, in the twenty-first case B1_R0G3, the twenty-second case B1_R1G3, the twenty-third case B1_R2G3, the twenty-fourth case B1_R3G3, and the twenty-fifth case B1_R4G3 located in the second row, the number of light emitting of the second color pixels can be 3, and the number of light emitting of the first color pixels is 0, 1, 2, 3, 4, respectively.

[0216] In the thirty-first case B1_R0G2, the thirty-second case B1_R1G2, the thirty-third case B1_R2G2, the thirty-fourth case B1_R3G2, and the thirty-fifth case B1_R4G2 located in the third row, the number of light emitting of the second color pixels can be 2, and the number of light emitting of the first color pixels is 0, 1, 2, 3, 4, respectively.

[0217] In the forty-first case B1_R0G1, the forty-second case B1_R1G1, the forty-third case B1_R2G1, the forty-fourth case B1_R3G1, and the forty-fifth case B1_R4G1 located in the fourth row, the number of light emitting of the second color pixels can be 1, and the number of light emitting of the first color pixels is 0, 1, 2, 3, 4, respectively.

[0218] In the fifty-first case B1_R0G0, the fifty-second case B1_R1G0, the fifty-third case B1_R2G0, the fifty-fourth case B1_R3G0, and the fifty-fifth case B1_R4G0 located in the fifth row, the number of light emitting of the second color pixels can be 0, and the number of light emitting of the first color pixels is 0, 1, 2, 3, 4, respectively.

[0219] In a fifty-first case B1_R0G0 located at the first column and the fifth row, a single color can be displayed in the third unit region OBA, for example, blue can be displayed in the third unit region OBA.

[0220] In the eleventh case B1_R0G4, the twenty-first case B1_R0G3, the thirty-first case B1_R0G2, and the forty-first case B1_R0G1 included in the first column, a double mixed color (i.e., a mixed color of the second color and the third color) can be displayed in the third unit region OBA, for example, cyan can be displayed in the third unit region OBA.

[0221] In the fifty-second case B1_R1G0, the fifty-third case B1_R2G0, the fifty-fourth case B1_R3G0, and the fifty-fifth case B1_R4G0 included in the fifth row, a double mixed color (i.e., a mixed color of the first color and the third color) can be displayed in the third unit region OBA, for example, magenta can be displayed in the third unit region OBA.

[0222] In the cases included in the portions where the first to fourth rows intersect with the second to fifth columns, a triple mixed color or white can be displayed in the third unit region OBA.

[0223] As described with reference to Figure 13 to Figure 15 , the surrounding pixel state observation section 1612 can count the number of light-emitting pixels by color within each of the unit regions ORA, OGA, and OBA described with reference to Figure 2 , and divide the light-emitting states of the unit regions ORA, OGA, and OBA into 25 or 9 cases (i.e., a total of 59 cases). Also, the surrounding pixel state observation section 1612 can determine the color displayed in the corresponding unit region as one of a single color, a double mixed color, and a triple mixed color.

[0224] Referring again to Figure 1 and Figure 12 , the offset setting section 1613 can generate a corrected gray value based on the state information STATUS (i.e., the light-emitting states of the surrounding pixels PX_ADJ1 and PX_ADJ2) correcting the input gray value for the target pixel PX_T.

[0225] To illustrate the offset setting section 1613, reference can be made to Figure 16 to Figure 18 .

[0226] Figure 16 is a block diagram illustrating an example of the offset setting section included in the conversion section of Figure 12 . Figure 17 and Figure 18 are diagrams for illustrating a single color offset providing section included in the offset setting section of Figure 16 .

[0227] First, referring to Figure 1 , Figure 12 and Figure 16 , the offset setting section 1613 can include an offset providing section 1613-1 and a calculation section 1613-2, the offset providing section 1613-1 including a single-color offset providing section MCOP1, MCOP2, MCOP3, a double mixed-color offset providing section BCOP1, BCOP2, BCOP3, and a triple mixed-color offset providing section TCOP1, TCOP2, TCOP3.

[0228] The offset providing section 1613-1 can provide the calculation section 1613-2 with offset values corresponding to various cases described with reference to Figure 13 to Figure 15 The calculation section 1613-2 selects one of the offset values based on the state information STATUS, and generates a corrected gray value GRAY_C by correcting the input gray value GRAY_T of the target pixel PX_T using the selected one of the offset values.

[0229] The first single-color offset providing section MCOP1 can provide a first single-color offset value. The first single-color offset value can be a single-color offset value for the first color, and is different according to the input maximum luminance value DBV.

[0230] As shown in Figure 17 and Figure 18 , the first single-color offset providing section MCOP1 can receive the input maximum luminance value DBV, and select a first single-color reference offset value RRO1, RRO2, RRO3, RRO4, RRO5, RRO6, RRO7, RRO8, RRO9 corresponding to the input maximum luminance value DBV. A first single-color gray line RSL can represent a relationship between the corrected gray value and the input gray value.

[0231] The first single-color offset providing section MCOP1 can interpolate the first single-color reference offset values RRO1, RRO2, RRO3, RRO4, RRO5, RRO6, RRO7, RRO8, RRO9 to generate a first single-color offset value for the entire gray range. The interpolation method can include an existing linear interpolation, a polynomial interpolation, an exponential interpolation, or the like.

[0232] For example, as shown in Figure 18As shown, the first monochrome offset providing section MCOP1 can interpolate the first monochrome reference offset value RRO2 corresponding to 7 gradations and the first monochrome reference offset value RRO3 corresponding to 11 gradations to generate the first monochrome offset value RS08 corresponding to 8 gradations, the first monochrome offset value RS09 corresponding to 9 gradations, and the first monochrome offset value RS010 corresponding to 10 gradations, respectively. Since the first monochrome offset providing section MCOP1 does not need to store all the first monochrome offset values, the configuration cost for the storage elements can be saved.

[0233] Referring again to Figure 16 , the second monochrome offset providing section MCOP2 can provide second monochrome offset values. The second monochrome offset values can be monochrome offset values for the second color and differ according to the input maximum luminance value DBV.

[0234] The third monochrome offset providing section MCOP3 can provide third monochrome offset values. The third monochrome offset values can be monochrome offset values for the third color and differ according to the input maximum luminance value DBV.

[0235] The first double mixed color offset providing section BCOP1 can provide first double mixed color offset values. The first double mixed color offset values can be double mixed color offset values for the mixed color of the first color and the second color (e.g., yellow) or the mixed color of the first color and the third color (e.g., magenta) for the object pixel PX_T of the first color.

[0236] The second double mixed color offset providing section BCOP2 can provide second double mixed color offset values. The second double mixed color offset values can be double mixed color offset values for the mixed color of the second color and the first color (e.g., yellow) or the mixed color of the second color and the third color (e.g., cyan) for the object pixel PX_T of the second color.

[0237] The third double mixed color offset providing section BCOP3 can provide third double mixed color offset values. The third double mixed color offset values can be double mixed color offset values for the mixed color of the third color and the first color (e.g., magenta) or the mixed color of the third color and the second color (e.g., cyan) for the object pixel PX_T of the third color.

[0238] The first triple mixed color offset providing section TCOP1 can provide first triple mixed color offset values. The first triple mixed color offset values can be triple mixed color offset values for the mixed color of the first color, the second color, and the third color for the object pixel PX_T of the first color.

[0239] The second tri-mixing color offset providing section TCOP2 can provide a second tri-mixing color offset value. The second tri-mixing color offset value can be a tri-mixing color offset value for mixing of the first color, the second color, and the third color for the object pixel PX_T of the second color.

[0240] The third tri-mixing color offset providing section TCOP3 can provide a third tri-mixing color offset value. The third tri-mixing color offset value can be a tri-mixing color offset value for mixing of the first color, the second color, and the third color for the object pixel PX_T of the third color.

[0241] Hereinafter, for convenience of explanation, it is assumed that the object pixel PX_T emits light in the first color. In this case, the offset setting section 1613 can correct the input gray value GRAY_T of the object pixel PX_T based on the state information STATUS of the surrounding pixels PX_ADJ1, PX_ADJ2 that emit light in the second color and the third color.

[0242] In a case where the state information STATUS includes the number of light emissions of the second color pixel and the number of light emissions of the third color pixel, the calculation section 1613-2 can generate the corrected gray value GRAY_C by correcting the input gray value GRAY_T based on the number of light emissions of the second color pixel and the number of light emissions of the third color pixel. For example, the calculation section 1613-2 can select one of the first single-color offset value, the first double-mixing color offset value, and the first tri-mixing color offset value, and generate the corrected gray value GRAY_C by adding the selected offset value to the input gray value GRAY_T.

[0243] For example, when the number of light emissions of the second color pixel and the number of light emissions of the third color pixel in the surrounding pixels PX_ADJ1, PX_ADJ2 are 0, the calculation section 1613-2 can select the corresponding single-color offset value from the first single-color offset value, and generate the corrected gray value GRAY_C by adding the selected single-color offset value to the input gray value GRAY_T.

[0244] Reference Signs Figure 17For example, when the input gray scale value is 1, the first single-color offset value RS01 of 0 can be added to generate a corrected gray scale value of 1. Also, when the input gray scale value is 7, the first single-color offset value RS07 of 17 can be added to generate a corrected gray scale value of 24. Also, when the input gray scale value is 11, the first single-color offset value RS011 of 53 can be added to generate a corrected gray scale value of 64. Also, when the input gray scale value is 23, the first single-color offset value RS023 of 47 can be added to generate a corrected gray scale value of 70. Also, when the input gray scale value is 35, the first single-color offset value RS035 of 40 can be added to generate a corrected gray scale value of 75. Also, when the input gray scale value is 51, the first single-color offset value RS051 of 32 can be added to generate a corrected gray scale value of 83. Also, when the input gray scale value is 87, the first single-color offset value RS087 of 20 can be added to generate a corrected gray scale value of 107. Also, when the input gray scale value is 151, the first single-color offset value RS0151 of 5 can be added to generate a corrected gray scale value of 156. Also, when the input gray scale value is 203, the first single-color offset value RS0203 of 3 can be added to generate a corrected gray scale value of 206. When the input gray scale value is 255, the corrected gray scale value can be 255. When the input gray scale value is 0, the corrected gray scale value can be 0.

[0245] As another example, when the number of light emissions of the second color pixel in the surrounding pixels PX_ADJ1, PX_ADJ2 is greater than 0 and the number of light emissions of the third color pixel is 0, the calculation section 1613-2 can select a corresponding double-mixing color offset value from the first double-mixing color offset values and add the selected double-mixing color offset value to the input gray scale value GRAY_T to generate a corrected gray scale value GRAY_C.

[0246] As still another example, in a case where the number of light emissions of the second color pixel in the surrounding pixels PX_ADJ1, PX_ADJ2 is greater than 0, the number of light emissions of the third color pixel is greater than 0, and the number of light emissions of the second color pixel is not equal to the number of light emissions of the third color pixel, the calculation section 1613-2 can select a corresponding triple-mixing color offset value from the first triple-mixing color offset values and add the selected triple-mixing color offset value to the input gray scale value GRAY_T to generate a corrected gray scale value GRAY_C.

[0247] As still another example, in a case where the number of light emissions of the second color pixel is greater than 0, the number of light emissions of the third color pixel is greater than 0, and the number of light emissions of the second color pixel is equal to the number of light emissions of the third color pixel in the surrounding pixels PX_ADJ1, PX_ADJ2, the calculation section 1613-2 can determine the input gray value GRAY_T as the corrected gray value GRAY_C. In this case, the offset value can be 0.

[0248] Referring again to Figure 1 and Figure 12 , the data output section 1614 can sequentially output the corrected gray value GRAY_C according to the pixel arrangement.

[0249] The black voltage conversion section 162 can set the black gray value (or the voltage level of the black voltage) of the surrounding pixels PX_ADJ1, PX_ADJ2 based on the state information STATUS (i.e., the light emission state of the surrounding pixels PX_ADJ1, PX_ADJ2).

[0250] The black voltage conversion section 162 can include a black voltage offset setting section 1621, a black voltage leveling section 1622, a black voltage matching section 1623, a repeated processing section 1624, and a black voltage output section (or a black gray value output section) 1625.

[0251] The black voltage offset setting section 1621 can determine the black offset value OFFSET_B based on the input maximum luminance value DBV and the state information STATUS. Here, the black offset value OFFSET_B indicates a voltage value required to correct the normal black voltage as the black voltage V_BLACK, and the normal black voltage can be preset based on a case where the unit area OA emits white light and is a data voltage corresponding to the minimum gray value. According to an embodiment, the black voltage offset setting section 1621 can also determine the voltage level of the black voltage V_BLACK based on the black offset value OFFSET_B.

[0252] Hereinafter, referring to Figure 19 , a normal black voltage is described, referring to Figure 20 , a black offset value OFFSET_B is described, and then the black voltage leveling section 1622 to the black voltage output section 1625 are described.

[0253] Figure 19 is a look-up table showing the normal black voltage according to the luminance of the pixel included in the display device of Figure 1 .

[0254] Referring to Figure 19The first lookup table B_LUT1 may include information about a first color normal black voltage R_Black for a first color pixel, a second color normal black voltage G_Black for a second color pixel, and a third color normal black voltage B_Black for a third color pixel according to an input maximum brightness value DBV.

[0255] For reference, under driving conditions where the input maximum brightness value DBV is above 100 nits, Figure 5 The display device 10' can be controlled by referring to Figure 6 The amount of current flowing through the first thin-film transistor M1 is described to change the brightness of the pixel. Accordingly, when the input maximum brightness value DBV is greater than or equal to 100 nits (for example, at 100 nits, 200 nits, 300 nits, 650 nits, 1000 nits, and 1200 nits, respectively), the first color normally black voltage R_Black, the second color normally black voltage G_Black, and the third color normally black voltage B_Black can be set to be constant. For example, each of the first color normally black voltage R_Black, the second color normally black voltage G_Black, and the third color normally black voltage B_Black can have a voltage level of 6.1 volts.

[0256] Moreover, under the driving condition that the input maximum brightness value DBV is less than 100 nits, Figure 5 The display device 10' can be maintained by referring to Figure 6 The amount of current flowing through the first thin-film transistor M1 is described as being constant and controlling the pulse width (or cut-off duty cycle, luminous duty cycle) of the cut-off level of the light-emitting signal (i.e., the light-emitting signal applied to the gate electrode of each of the fifth thin-film transistor M5 and the sixth thin-film transistor M6) to change the brightness of the pixel. For example, as the cut-off duty cycle of the light-emitting signal increases, the brightness of the pixel may decrease. That is, the display device 10' may use a dimming driving method to change the brightness of the pixel under the driving condition that the input maximum brightness value DBV is less than 100 nits. Accordingly, the actual use range of the data voltage may be smaller than the range of the data voltage under the driving condition that the input maximum brightness value DBV is greater than 100 nits. Furthermore, under the driving condition that the input maximum brightness value DBV is less than 100 nits, in order to reduce the power consumption of the display device 10' corresponding to the reduction in the range of the data voltage, the display device 10' may change the data voltage applied to the gate electrode according to the input maximum brightness value DBV. Figure 6at least one of the power supply voltages of the first power supply line ELVDD and the second power supply line ELVSS, and the display device 10' can change the first color normal black voltage R_Black, the second color normal black voltage G_Black, and the third color normal black voltage B_Black according to the input maximum luminance value DBV in correspondence with a variation in at least one of the power supply voltages. For example, under a driving condition in which the input maximum luminance value DBV is less than 100 nits, as the input maximum luminance value DBV decreases, the second color normal black voltage G_Black and the third color normal black voltage B_Black can have a lower voltage level.

[0257] Referring to the first lookup table B_LUT1, under a driving condition in which the input maximum luminance value DBV is 60 nits, the second color normal black voltage G_Black and the third color normal black voltage B_Black can have a voltage level of 5.99 volts, which is 0.11 volts lower than 6.1 volts. Under a driving condition in which the input maximum luminance value DBV is 30 nits, the second color normal black voltage G_Black and the third color normal black voltage B_Black can have a voltage level of 5.84 volts, which is 0.26 volts lower than 6.1 volts under a driving condition of 100 nits. Under a driving condition in which the input maximum luminance value DBV is less than 30 nits, the voltage levels of the second color normal black voltage G_Black and the third color normal black voltage B_Black are as shown in the first lookup table B_LUT1, and thus a description thereof is omitted.

[0258] However, in order to prevent a phenomenon in which an image is displayed reddish due to a driving current leaking (i.e., side leakage) to a light emitting layer of a first color pixel (e.g., a red pixel) through a PHIL layer, which is a layer shared by organic light emitting diodes as pixels, even if the input maximum luminance value DBV decreases, the first color normal black voltage R_Black can have a constant value.

[0259] However, it is not limited thereto. For example, referring to the second lookup table B_LUT2, under a driving condition in which the input maximum luminance value DBV is less than 100 nits, as the input maximum luminance value DBV decreases, the first color normal black voltage R_Black can also have a lower voltage level, and the first color normal black voltage R_Black has a voltage level equal to that of the second color normal black voltage G_Black or the third color normal black voltage B_Black.

[0260] In particular, the black voltage conversion section 162 can set the black voltage of the surrounding pixels PX_ADJ1, PX_ADJ2 based on the emission state (i.e., the state information STATUS) of the surrounding pixels PX_ADJ1, PX_ADJ2, whereby the side leakage is reduced. Thus, the black voltage offset setting section 1621 can use the first color normal black voltage R_Black, the second color normal black voltage G_Black, and the third color normal black voltage B_Black of the second lookup table B_LUT2.

[0261] In addition, in a case where the black voltage offset setting section 1621 sets the black voltage of the surrounding pixels PX_ADJ1, PX_ADJ2 using the second lookup table B_LUT2, the set black voltage can have a relatively low voltage level (i.e., an optimized voltage level) than the black voltage within the first lookup table B_LUT1, whereby the characteristic variation of the in-pixel drive transistor (the threshold voltage of the drive transistor is more shifted in a case where a relatively high black voltage is applied as a hysteresis characteristic), the temporal afterimage caused by the characteristic variation, and the like can also be reduced.

[0262] Figure 20 is a lookup table showing the black offset of the pixel displaying the color within the unit area included in the display device according to Figure 1

[0263] Referring to Figure 1 and Figure 20 , the third lookup table LUT3 can include the black offset value for the surrounding pixels PX_ADJ1, PX_ADJ2 according to the input maximum luminance value DBV in a case where the unit area OA displays a single color (or, a primary color) and a double mixed color (or, a secondary color). The black offset value can be set in advance by multi-time programming (MTP) and stored in advance in a memory device or the like. Also, similarly to the offset value described with reference to Figure 16 , the black offset value for only a part of the maximum luminance values (e.g., a reference maximum luminance value) can be stored in advance, and the black offset value for the remaining maximum luminance values can be generated by interpolating the black offset value stored in advance.

[0264] First, it is assumed that the unit area OA displays a first color. For example, it is assumed that the fifty-first case R1_G0B0 described with reference to Figure 13

[0265] In this case, the black offset value for the second color black voltage G_Black of the second color pixel can be set to have a value greater than 0. ​​

[0266] For example, in a case where the input maximum luminance value DBV is 100 nits, the black offset value for the second color black voltage G_Black can be 0.06 volts. The greater the input maximum luminance value DBV is than 100 nits, the greater the black offset value for the second color black voltage G_Black can be, for example, in a case where the input maximum luminance value DBV is 1200 nits, the black offset value for the second color black voltage G_Black is 0.08 volts. The smaller the input maximum luminance value DBV is than 100 nits, the greater the black offset value for the second color black voltage G_Black can be, for example, in a case where the input maximum luminance value DBV is 4 nits, the black offset value for the second color black voltage G_Black is 0.35 volts.

[0267] In addition, the black offset value for the third color black voltage B_Black of the third color pixel can be about 0 volts. As described with reference to Figure 11 the third color luminance curve BWC for the light of the third color can have a similar shape to the desired gamma curve, and has little influence on the side leakage in a case where the third color pixel does not emit light. Therefore, the black offset value for the third color black voltage B_Black can be about 0 volts.

[0268] Next, a case where the unit area OA displays the second color is assumed. For example, a thirty-first case G1_B0R0 described with reference to Figure 14 is assumed.

[0269] In this case, the black offset value for the first color black voltage R_Black of the first color pixel can be set to have a value greater than 0.

[0270] For example, in a case where the input maximum luminance value DBV is 100 nits, the black offset value for the first color black voltage R_Black can be 0.11 volts. The greater the input maximum luminance value DBV is than 100 nits, the greater the black offset value for the first color black voltage R_Black can be, for example, in a case where the input maximum luminance value DBV is 1200 nits, the black offset value for the first color black voltage R_Black is 0.15 volts. The smaller the input maximum luminance value DBV is than 100 nits, the greater the black offset value for the first color black voltage R_Black can be, for example, in a case where the input maximum luminance value DBV is 4 nits, the black offset value for the first color black voltage R_Black is 0.70 volts.

[0271] Figure 11 ​The first color luminance curve RWC for the first color of light can have a larger gamma value than the second color luminance curve GWC, and the influence of side leakage for the first color pixel is greater than the influence of side leakage for the second color pixel. Accordingly, under the condition that the input maximum luminance value DBV is the same, the black offset value of the first color black voltage R_Black can be set to be greater than the black offset value of the second color black voltage G_Black.

[0272] In addition, the black offset value of the third color black voltage B_Black for the third color pixel can be about 0 volts.

[0273] Next, a case in which the unit area OA displays the third color is assumed. For example, it is assumed that reference is made to Figure 15 A fifty-first case B1_R0G0 is described.

[0274] In this case, the black offset value of the first color black voltage R_Black for the first color pixel and the black offset value of the second color black voltage G_Black for the second color pixel can be about 0 volts. The reason for this is that side leakage hardly occurs between the third color pixel and the first color pixel and the second color pixel.

[0275] Next, a case in which the unit area OA displays the first double mixed color (for example, cyan) is assumed. For example, it is assumed that reference is made to Figure 14 A eleventh case G1_B2R0 and a twenty-first case G1_B1R0 are described, and reference is made to Figure 15 A eleventh case B1_R0G4, a twenty-first case B1_R0G3, a thirty-first case B1_R0G2, and a forty-first case B1_R0G1 are described.

[0276] In this case, only the first color pixel among the surrounding pixels PX_ADJ1, PX_ADJ2 does not emit light, and the black offset value of the first color black voltage R_Black for the first color pixel can be set to have a value greater than 0.

[0277] For example, the black offset value of the first color black voltage R_Black for the first color pixel can be the same as the black offset value of the first color black voltage R_Black in the case in which the unit area OA displays the second color. However, it is not limited thereto, and the black offset value of the first color black voltage R_Black for the first color pixel can also be set to be different from the black offset value of the first color black voltage R_Black in the case in which the unit area OA displays the second color in the case in which the unit area OA displays the first double mixed color (for example, cyan).

[0278] Next, a case where the unit area OA displays a second double mixed color (for example, magenta) is assumed. For example, it is assumed that the second double mixed color (for example, magenta) is displayed in the unit area OA with reference to one of the 51st case R1_G0B4, the 52nd case R1_G0B3, the 53rd case R1_G0B2, and the 54th case R1_G0B1 described above. Figure 13 Next, a case where the unit area OA displays a second double mixed color (for example, magenta) is assumed. For example, it is assumed that the second double mixed color (for example, magenta) is displayed in the unit area OA with reference to one of the 51st case R1_G0B4, the 52nd case R1_G0B3, the 53rd case R1_G0B2, and the 54th case R1_G0B1 described above. Figure 15 Next, a case where the unit area OA displays a second double mixed color (for example, magenta) is assumed. For example, it is assumed that the second double mixed color (for example, magenta) is displayed in the unit area OA with reference to one of the 51st case R1_G0B4, the 52nd case R1_G0B3, the 53rd case R1_G0B2, and the 54th case R1_G0B1 described above.

[0279] In this case, only the second color pixel among the surrounding pixels PX_ADJ1, PX_ADJ2 does not emit light, and the black offset value of the second color black voltage G_Black for the second color pixel can be set to have a value larger than 0.

[0280] For example, the black offset value of the second color black voltage G_Black for the second color pixel can be the same as the black offset value of the second color black voltage G_Black in a case where the unit area OA displays the first color. However, it is not limited thereto, and in a case where the unit area OA displays the second double mixed color (for example, magenta), the black offset value of the second color black voltage G_Black for the second color pixel can also be set to be different from the black offset value of the second color black voltage G_Black in a case where the unit area OA displays the first color.

[0281] Next, a case where the unit area OA displays a third double mixed color (for example, yellow) is assumed. For example, it is assumed that the third double mixed color (for example, yellow) is displayed in the unit area OA with reference to one of the 52nd case R1_G1B0, the 53rd case R1_G2B0, the 54th case R1_G3B0, and the 55th case R1_G4B0 described above. Figure 13 Next, a case where the unit area OA displays a third double mixed color (for example, yellow) is assumed. For example, it is assumed that the third double mixed color (for example, yellow) is displayed in the unit area OA with reference to one of the 52nd case R1_G1B0, the 53rd case R1_G2B0, the 54th case R1_G3B0, and the 55th case R1_G4B0 described above. Figure 14 Next, a case where the unit area OA displays a third double mixed color (for example, yellow) is assumed. For example, it is assumed that the third double mixed color (for example, yellow) is displayed in the unit area OA with reference to one of the 52nd case R1_G1B0, the 53rd case R1_G2B0, the 54th case R1_G3B0, and the 55th case R1_G4B0 described above.

[0282] In this case, only the third color pixel among the surrounding pixels PX_ADJ1, PX_ADJ2 does not emit light, and the black offset value of the third color black voltage B_Black for the third color pixel can be approximately 0.

[0283] In addition, a case where the unit area OA displays a triple mixed color or white is assumed.

[0284] In this case, the black offset value of the first color black voltage R_Black for the first color pixel, the black offset value of the second color black voltage G_Black for the second color pixel, and the black offset value of the third color black voltage B_Black for the third color pixel can be 0.

[0285] As described with reference to Figure 19 and Figure 20 , the black offset value can be determined in accordance with the emission state of the surrounding pixels PX_ADJ1, PX_ADJ2.

[0286] In addition, the configuration for adding the black offset value OFFSET_B (refer to Figure 12 ) of each pixel individually to the normal black voltage to generate the black voltage V_BLACK after the normal black voltage (i.e., a general data voltage corresponding to the minimum gradation) is generated can be very complicated.

[0287] Therefore, the black voltage conversion section 162 can generate a black gradation value corresponding to the black offset value OFFSET_B (or the black voltage V_BLACK), and the data drive section 12 selects one of the reference black voltages RV0_1 to RV0_256, GV0_1 to GV0_256, BV0_1 to BV0_256 (refer to Figure 1 ) based on the black gradation value to generate the black voltage V_BLACK.

[0288] Referring again to Figure 12 , the black voltage offset setting section 1621 can determine the black offset value OFFSET_B (or the voltage level of the black voltage V_BLACK, refer to Figure 23 ) using the second lookup table B_LUT2 and the third lookup table B_LUT3 described with reference to Figure 19 and Figure 20 .

[0289] The black voltage leveling section 1622 can generate black gradation values corresponding to the reference black voltages RV0_1 to RV0_256, GV0_1 to GV0_256, BV0_1 to BV0_256 (refer to Figure 1 ), and the black voltage matching section 1623 selects one of the black gradation values based on the black offset value OFFSET_B (or the black voltage V_BLACK) set in the black voltage offset setting section 1621.

[0290] In one embodiment, the black voltage leveling section 1622 can determine the voltage levels of the first reference black voltages RV0_1 to RV0_256 based on the first reference voltage VH (refer to Figure 1 ) and the zeroth reference gamma voltage RV0 (refer to Figure 9 ) used in the voltage generation section 15 (refer to Figure 9 ). For example, the black voltage leveling section 1622 can multiply the first reference voltage VH (refer to Figure 9 ) and the zeroth reference gamma voltage RV0 (refer to Figure 9) to determine voltage levels of the first reference black voltages RV0_1 to RV0_256. Also, the black voltage leveling section 1622 can generate a lookup table indicating a relationship between the voltage levels of the first reference black voltages RV0_1 to RV0_256 and the black gray scale value BV.

[0291] By a similar manner, the black voltage leveling section 1622 can determine voltage levels of the second reference black voltages GV0_1 to GV0_256 and the third reference black voltages BV0_1 to BV0_256, respectively, and generate a lookup table including a relationship between the voltage levels of the second reference black voltages GV0_1 to GV0_256 and the black gray scale value BV and a relationship between the voltage levels of the third reference black voltages BV0_1 to BV0_256 and the black gray scale value BV.

[0292] In another embodiment, the black voltage leveling section 1622 can receive information on the first reference black voltages RV0_1 to RV0_256 from the voltage generation section 15 (refer to Figure 1 ) and generate the black gray scale value BV (or a lookup table including the black gray scale value) based on the information on the first reference black voltages RV0_1 to RV0_256.

[0293] For the sake of description of the black gray scale value BV, reference can be made to Figure 21 .

[0294] Figure 21 is a diagram showing an example of a lookup table generated by the black voltage leveling section included in the conversion section of Figure 12 .

[0295] Referring to Figure 12 and Figure 21 , the fourth lookup table B_LUT4 can include a voltage level value for each of the first reference black voltages RV0_1 to RV0_256. The voltage level of the first reference black voltage RV0_1 can be equal to the first reference voltage VH, and the voltage level of the two hundred fifty-sixth reference black voltage RV0_256 can be equal to the zeroth reference gamma voltage RV0. The voltage level of the second reference black voltage RV0_2 can be equal to a value obtained by subtracting 1 / 255 of a difference between the first reference voltage VH and the zeroth reference gamma voltage RV0 from the first reference voltage VH. Similarly, the voltage level of the third reference black voltage RV0_3 can be equal to a value obtained by subtracting 2 / 255 of the difference between the first reference voltage VH and the zeroth reference gamma voltage RV0 from the first reference voltage VH.

[0296] That is, the first reference black voltage RV0_1 to the two hundred fifty-sixth reference black voltage RV0_256 can be represented by the following mathematical expression 2.

[0297] [Mathematical formula 2]

[0298] RV0_i=VH-(VH-RV0)×(i-1) / 255

[0299] Here, RV0_i is the i-th reference black voltage, VH is the first reference voltage VH, and RV0 is the zeroth reference gamma voltage RV0.

[0300] The black voltage matching unit 1623 may select a black grayscale value GRAY_B that matches the black offset value OFFSET_B (or the black voltage V_BLACK) set in the black voltage offset setting unit 1621 .

[0301] When different black grayscale values ​​(or black voltages) are set for surrounding pixels within a plurality of unit areas, the repetitive processing unit 1624 may select one of the different black grayscale values ​​or average the black grayscale values ​​to generate a corrected black grayscale value GRAY_B_C.

[0302] To explain the operation of the repetitive processing unit 1624, please refer to Figure 22 .

[0303] Figure 22 Is used to illustrate Figure 12 FIG. 1 is a diagram illustrating the operation of the repetitive processing unit included in the conversion unit. Figure 22 The diagram exemplarily shows Figure 2 The corresponding pixel portion 14.

[0304] The fourth unit area OGA1 can be set based on the 33rd pixel GP33 and include the 44th pixel RP44 as a surrounding pixel. The fifth unit area OGA2 can be set based on the 55th pixel GP55 and include the 44th pixel RP44 as a surrounding pixel. It is assumed below that in the fourth unit area OGA1 and the fifth unit area OGA2, only the 22nd pixel RP22, the 33rd pixel GP33, and the 55th pixel GP55 emit light.

[0305] The fourth unit area OGA1 may correspond to the reference Figure 14 The thirty-second case G1_B0R1 is described, and the fourth unit area OGA1 can display a double mixed color of yellow. In this case, the black voltage offset setting unit 1621 may not be based on Figure 20 The third lookup table B_LUT3 separately sets the first black offset value of the forty-fourth pixel RP44 (ie, the forty-fourth pixel RP44 that does not emit light). For example, the first black offset value of the forty-fourth pixel RP44 may be 0.

[0306] Further, the fifth unit region OGA2 can correspond to the reference Figure 14 The thirty-first case G1_B0R0 is illustrated, and the fifth unit region OGA5 can display a single color (i.e., green). In this case, the black voltage offset setting section 1621 can set the first black offset value of the forty-fourth pixel RP44 (i.e., the forty-fourth pixel RP44 that does not emit light) to be greater than 0 based on the third lookup table B_LUT3. Figure 20

[0307] Accordingly, the first black offset value of the forty-fourth pixel RP44 (i.e., the value 0) set based on the fourth unit region OGA1 and the first black grayscale value (and the black voltage) corresponding thereto can be different from the first black offset value of the forty-fourth pixel RP44 (i.e., the value greater than 0) set based on the fifth unit region OGA2 and the second black grayscale value (and the black voltage) corresponding thereto.

[0308] In this case, the repetition processing section 1624 can select one of the first black grayscale value and the second black grayscale value or average the first black grayscale value and the second black grayscale value to generate the corrected black grayscale value GRAY_B_C.

[0309] For example, the repetition processing section 1624 can select the maximum value of the first black grayscale value and the second black grayscale value to generate the corrected black grayscale value GRAY_B_C. As another example, the repetition processing section 1624 can select the minimum value of the first black grayscale value and the second black grayscale value to generate the corrected black grayscale value GRAY_B_C. As still another example, the repetition processing section 1624 can average the first black grayscale value and the second black grayscale value to generate the corrected black grayscale value GRAY_B_C.

[0310] Referring again to Figure 12 , the black voltage output section 1625 can sequentially output the corrected black grayscale value GRAY_B_C according to the pixel arrangement.

[0311] In one embodiment, the black voltage output section 1625 can simultaneously output the black grayscale value GRAY_B_C of the specific pixel in correspondence with the corrected grayscale value GRAY_C of the specific pixel. That is, since the corrected grayscale value GRAY_C for the specific pixel generated at the time point selected as the object pixel and the black grayscale value GRAY_B_C for the specific pixel generated at the plurality of time points selected as the surrounding pixels are generated at different time points from each other, the data output section 1614 and the black voltage output section 1625 can also output the corrected grayscale value GRAY_C and the black grayscale value GRAY_B_C for the specific pixel at the same time point.

[0312] ​According to an embodiment, the black voltage output section 1625 (or, the timing control section 11) can generate one conversion gradation value including the corrected gradation value GRAY_C and the black gradation value GRAY_B_C. The conversion gradation value can be provided to the data driving section 12.

[0313] For example, in a case where each of the corrected gradation value GRAY_C and the black gradation value GRAY_B_C is represented by 8 bits, the conversion gradation value can be represented by 9 bits, in a case where the most significant bit of the conversion gradation value is 1, the conversion gradation value represents the corrected gradation value GRAY_C, and in a case where the most significant bit of the conversion gradation value is 0, the conversion gradation value represents the black gradation value GRAY_B_C.

[0314] As described with reference to Figure 12 to Figure 20 , the conversion section 16 can generate the corrected gradation value (i.e., the corrected gradation value for the corrected data voltage) based on the emission state of the surrounding pixels to correct the input gradation value of the object pixel, and generate the black gradation value (i.e., the black gradation value for adjusting the black voltage corresponding to the minimum gradation) for the surrounding pixels (especially, the surrounding pixels not emitting light) based on the emission state of the surrounding pixels. Thereby, in a case where white light and monochromatic light, mixed color light are emitted from the pixels, an image having a desired luminance and color coordinates can be displayed.

[0315] Figure 23 is a lookup table showing the black voltage finally set by the conversion section of Figure 12 .

[0316] With reference to Figure 1 , Figure 12 , Figure 19 , Figure 20 and Figure 23 , the fifth lookup table B_LUT5 can include the black voltage for the surrounding pixels PX_ADJ1, PX_ADJ2 according to the input maximum luminance value DBV in a case where a unit area OA displays monochromatic (or, primary colors), double mixed color (or, secondary colors), and colors other than these (for example, triple mixed color, white) (or, general black).

[0317] The black voltages R_Black, G_Black, B_Black included in the fifth lookup table B_LUT5 can be equal to the black voltages R_Black, G_Black, B_Black of the second lookup table LUT2 described with reference to Figure 19 . Figure 20The results of the black offset values are described. Therefore, the description for each of the black voltages R_Black, G_Black, and B_Black is omitted.

[0318] Figure 24 is a flowchart showing a driving method of a display device according to an embodiment of the present application.

[0319] Referring to Figure 1 , Figure 5 , Figure 12 and Figure 24 , Figure 24 The method of Figure 1 may be executed in the display device 10 of Figure 5 and / or the display device 10' of

[0320] In the method of Figure 24 , the input gray value corresponding to the target pixel PX_T and the observation gray values corresponding to the surrounding pixels PX_ADJ1 and PX_ADJ2 can be received (S2410).

[0321] As described with reference to Figure 12 , the data input unit 1611 can receive the gray value GRAY (or, input image data) and extract the gray values for the surrounding pixels PX_ADJ1 and PX_ADJ2 within the unit area OA, i.e., the observation gray values GRAY_ADJ.

[0322] After that, Figure 24 The method of may determine the light emission states of the surrounding pixels PX_ADJ1 and PX_ADJ2 based on the observation gray values.

[0323] Figure 24 In an embodiment, in the method of , the number of observation gray values greater than the reference gray value can be counted to calculate the number of light emission pixels of the surrounding pixels PX_ADJ1 and PX_ADJ2 (S2420).

[0324] Figure 12 to Figure 15 As described with reference to , the surrounding pixel state observation unit 1612 can calculate the first number of light emission pixels of the first color pixels, the second number of light emission pixels of the second color pixels, and the third number of light emission pixels of the third color pixels, respectively, per unit area.

[0325] Figure 24 After that, in the method of , the input gray value for the target pixel PX_T can be corrected based on the number of light emission pixels (S2430).

[0326] Figure 12 As described with reference to Figure 16 to Figure 18The offset setting section 1613 can select one of the preset offset values based on the number of light-emitting pixels, and generate the corrected gray scale value GRAY C by adding the selected offset value to the input gray scale value GRAY T.

[0327] Also, in the method of Figure 24 , the black gray scale value (or, black offset value, black voltage) for the surrounding pixels PX ADJ1, PX ADJ2 can be determined based on the number of light-emitting pixels (S2440).

[0328] As described with reference to Figure 12 and Figure 19 to Figure 21 , the black voltage offset setting section 1621 can determine the black offset value OFFSET B based on the input maximum luminance value DBV and the number of light-emitting pixels (i.e., the status information STATUS), the black voltage leveling section 1622 generates the black gray scale values corresponding to the reference black voltages RV0 1 ~ RV0 256, GV0 1 ~ GV0 256, BV0 1 ~ BV0 256, and the black voltage matching section 1623 selects one of the black gray scale values matching the black offset value OFFSET B set at the black voltage offset setting section 1621.

[0329] In an embodiment, in the method of Figure 24 , one of the different black gray scale values or an average of the black gray scale values can be selected and generated as the corrected black gray scale value GRAY B C in a case where different black gray scale values (or, black voltages) are set for one surrounding pixel located in a plurality of unit regions.

[0330] As described with reference to Figure 22 , the pixel section 14 can include a fourth unit region OGA1 and a fifth unit region OGA2, and the forty-fourth pixel RP44 that does not emit light is located within the fourth unit region OGA1 and the fifth unit region OGA2. In this case, in the method of Figure 24 , a first black voltage (or, a first black gray scale value) for the forty-fourth pixel RP44 can be set based on the fourth unit region OGA1, and a second black voltage (or, a second black gray scale value) for the forty-fourth pixel RP44 can be set based on the fifth unit region OGA2. In a case where the first black voltage and the second black voltage are different from each other, in the method of Figure 24 , one of the first black voltage and the second black voltage or an average of the first black voltage and the second black voltage can be selected and output as the corrected black voltage (or, the corrected black gray scale value).

[0331] After that, in the method of Figure 24In the method, the data voltage corresponding to the corrected input gray value can be supplied to the object pixel PX_T, and the black voltage corresponding to the black gray value (or the corrected black gray value) is applied to the non-light-emitting surrounding pixels among the surrounding pixels PX_ADJ1, PX_ADJ2 (S2450).

[0332] As described with reference to Figure 24 The driving method of the display device can correct the input gray value of the object pixel PX_T based on the light-emitting state of the surrounding pixels PX_ADJ1, PX_ADJ2, and variably set the black voltage of the surrounding pixels PX_ADJ1, PX_ADJ2. Thereby, the side leakage can be prevented, and the desired luminance can be displayed even in the case where the display device 10 displays the image of the monochromatic light and the mixed color light.

[0333] The above, although described with reference to the preferred embodiments of the present application, as long as the skilled person in the art or the person having ordinary knowledge in the art can understand that the present application can be modified and changed in various ways within the scope of the idea and technical field of the present application recited in the claims.

[0334] Therefore, the technical scope of the present application should not be limited to the contents recited in the detailed description of the specification, but should be determined by the scope of the claims.

Claims

1. A display device comprising: a pixel portion including a target pixel and surrounding pixels located within a unit area set based on the target pixel; a conversion unit configured to adjust a voltage level of a data voltage for the target pixel based on a light emitting state of the surrounding pixels, and to determine a voltage level of a black voltage calculated using a value of 0 or a black offset value greater than 0 for at least one of the surrounding pixels that does not emit light, based on the light emitting state of the surrounding pixels; as well as The data driving unit applies the data voltage to the target pixel and applies the black voltage to the at least one surrounding pixel that does not emit light.

2. The display device according to claim 1, wherein The target pixel is a first color pixel that emits light in a first color. The surrounding pixels include second color pixels emitting light in a second color and third color pixels emitting light in a third color.

3. The display device according to claim 2, wherein: The first color is one of red and green, the second color is the other of red and green, and the third color is blue. The conversion section changes a voltage level of the black voltage for the second color pixel based on the light emission state and maintains a voltage level of the black voltage for the third color pixel constant under a condition that the luminance of the unit area is constant.

4. The display device according to claim 2, wherein The unit area is an area within a first radius based on the target pixel. The first radius corresponds to a distance between the object pixel and a first color pixel that is most adjacent to the object pixel.

5. The display device according to claim 2, wherein When it is determined that at least one of the second color pixels emits light, the conversion unit sets the second black voltage for the second color pixel to have a first voltage level. When it is determined that all the second color pixels are not emitting light, the conversion unit sets the second black voltage to have a second voltage level. The display device according to claim 5 , wherein: Each of the target pixel and the surrounding pixels includes a light emitting element and a driving transistor that controls an amount of driving current flowing in the light emitting element in response to the data voltage. The driving transistor is implemented using a P-type transistor. The second voltage level is higher than the first voltage level.

7. The display device according to claim 1, wherein The conversion unit includes: a grayscale conversion unit that determines the light emission state of the surrounding pixels based on a reference grayscale value for the surrounding pixels, and corrects an input grayscale value for the target pixel based on the light emission state of the surrounding pixels to generate a corrected grayscale value; and The black voltage conversion unit sets a black grayscale value indicating a voltage level of the black voltage based on the light emission state of the surrounding pixels.

8. The display device according to claim 7, wherein: Also includes: The voltage generating unit generates a reference gamma voltage and a reference black voltage. The data driving unit selects one of the reference gamma voltages based on the corrected grayscale value and outputs the selected one of the reference gamma voltages as the data voltage, and selects one of the reference black voltages based on the black grayscale value and outputs the selected one of the reference black voltages as the black voltage.

9. The display device according to claim 8, wherein The grayscale conversion unit determines the color displayed in the unit area to be one of a single color, a double color mixture, and a triple color mixture based on the light emission state of the surrounding pixels. When the color displayed in the unit area is a single color or a two-color mixture, the black voltage conversion unit determines the black offset value for the at least one surrounding pixel that does not emit light, and calculates the black grayscale value based on the black offset value.

10. The display device according to claim 9, wherein The black voltage conversion unit includes: a black voltage offset setting unit, which uses a first lookup table to determine the black offset value corresponding to the light emitting state; A black voltage leveling unit generates black grayscale values ​​corresponding to the reference black voltages; and The black voltage matching unit selects the black grayscale value corresponding to the black offset value from the black grayscale values.

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