Display device

Abstract

A display device is disclosed. The display device includes a processor and a display panel for receiving a viewing gray value from the processor. The display panel includes a data driver for applying a data voltage to the data lines, a target pixel coupled to at least one of the data lines, and observation pixels each coupled to at least one of the data lines and positioned adjacent to the target pixel. When all of the observation gradation values of the observation pixels exceed a reference value, the display panel applies a first data voltage to the target pixel. When at least one of the observation gradation values of the observation pixel does not exceed the reference value, the display panel applies a second data voltage to the target pixel. The first data voltage and the second data voltage are different from each other.

Description

[0001] Cross - reference to related applications

[0002] This patent application claims the priority of Korean Patent Application No. 10 - 2019 - 0024131, filed with the Korean Intellectual Property Office on February 28, 2019, the disclosure of which is incorporated herein by reference in its entirety. Technical field

[0003] Exemplary embodiments of the inventive concept relate to a display device and a driving method thereof. Background art

[0004] With the development of information technology, the importance of display devices as a connection medium between users and information has increased. Accordingly, display devices such as liquid crystal display devices, organic light - emitting display devices, and plasma display devices are increasingly used.

[0005] An organic light - emitting display device includes a plurality of pixels and allows organic light - emitting diodes of the plurality of pixels to emit light corresponding to a plurality of gray - scale values constituting an image frame, thereby displaying the image frame.

[0006] Generally, in an organic light - emitting display device, a gray - scale voltage is set to exhibit a brightness according to a gamma curve preferred for white light emitted when pixels of different colors emit light with the same brightness.

[0007] Therefore, when using the set gray - scale voltage to emit mixed - color light or monochromatic light instead of white light, the brightness of the mixed - color light or monochromatic light does not precisely correspond to the above - mentioned gamma curve. In addition, when emitting monochromatic light, holes of a driving current flowing through a corresponding pixel leak into adjacent pixels having a small resistance through a P - doped hole injection layer (PHIL) which is a layer shared by the organic light - emitting diodes, thereby lateral leakage may occur. Therefore, light may not be emitted with a desired brightness. Summary of the invention

[0008] According to an exemplary embodiment of the inventive concept, a display device may include a processor and a display panel configured to receive an observed gray - scale value from the processor. The display panel includes a data driver configured to apply a data voltage to a data line, a target pixel coupled to at least one of the data lines, and observation pixels each coupled to at least one of the data lines and positioned adjacent to the target pixel. When all of the observed gray - scale values of the observation pixels exceed a reference value, the display panel applies a first data voltage to the target pixel, and when at least one of the observed gray - scale values of the observation pixels does not exceed the reference value, the display panel applies a second data voltage to the target pixel, and the first data voltage and the second data voltage are different from each other.

[0009] There may be no other pixels between the target pixel and the observation pixel.

[0010] The target pixel may emit light of a first color. Some of the observation pixels may emit light of a second color different from the first color, and the other observation pixels may emit light of a third color different from the first color and the second color.

[0011] When the driving transistor of the target pixel is a P-type transistor, the first data voltage may be greater than the second data voltage.

[0012] When the driving transistor of the target pixel is an N-type transistor, the first data voltage may be less than the second data voltage.

[0013] According to an exemplary embodiment of the inventive concept, a display device may include a target pixel that emits light of a first color, a second-color observation pixel positioned adjacent to the target pixel and emitting light of a second color different from the first color, a third-color observation pixel positioned adjacent to the target pixel and emitting light of a third color different from the first color and the second color, and a gray-scale corrector configured to convert an input gray-scale value corresponding to the target pixel with reference to a second-color observation gray-scale value corresponding to the second-color observation pixel and a third-color observation gray-scale value corresponding to the third-color observation pixel. The gray-scale corrector includes a light-emitting pixel counter and a gray-scale converter. The light-emitting pixel counter is configured to provide a second-color light-emitting pixel count by counting the number of second-color observation gray-scale values exceeding a reference value and provide a third-color light-emitting pixel count by counting the number of third-color observation gray-scale values exceeding the reference value. The gray-scale converter is configured to provide a converted gray-scale value obtained by converting the input gray-scale value based on the second-color light-emitting pixel count and the third-color light-emitting pixel count.

[0014] The gray-scale corrector may further include a monochromatic offset provider configured to provide a monochromatic offset value. When the second-color light-emitting pixel count is 0 and the third-color light-emitting pixel count is 0, the gray-scale converter may generate a converted gray-scale value by adding a corresponding offset value among the monochromatic offset values to the input gray-scale value.

[0015] The gray-scale corrector may further include a dual-color mixing offset provider configured to provide a dual-color mixing offset value. When the second-color light-emitting pixel count is greater than 0 and the third-color light-emitting pixel count is 0, the gray-scale converter may generate a converted gray-scale value by adding a corresponding offset value among the dual-color mixing offset values to the input gray-scale value.

[0016] The grayscale corrector may further include a triple color mixing offset provider configured to provide a triple color mixing offset value. When the number of light-emitting pixels of the second color is greater than 0, the number of light-emitting pixels of the third color is greater than 0, and the number of light-emitting pixels of the second color and the number of light-emitting pixels of the third color are not equal to the number of observed pixels of the second color and the number of observed pixels of the third color respectively, the grayscale converter may generate a converted grayscale value by adding the corresponding offset value among the triple color mixing offset values to the input grayscale value.

[0017] When the number of light-emitting pixels of the second color is equal to the number of observed pixels of the second color and the number of light-emitting pixels of the third color is equal to the number of observed pixels of the third color, the grayscale converter may determine the input grayscale value as the converted grayscale value.

[0018] The monochromatic offset provider may include a monochromatic reference offset provider and a monochromatic total offset generator. The monochromatic reference offset provider is configured to receive an input maximum brightness value and provide a reference offset value corresponding to the input maximum brightness value, and the monochromatic total offset generator is configured to generate a monochromatic offset value by interpolating the reference offset value.

[0019] The monochromatic reference offset provider may include a monochromatic preset determiner. The monochromatic preset determiner is configured to pre-store preset offset values corresponding to preset maximum brightness values and determine whether the input maximum brightness value corresponds to any of the preset maximum brightness values. When the input maximum brightness value corresponds to any of the preset maximum brightness values, the monochromatic preset determiner may provide the corresponding preset offset value as the reference offset value.

[0020] When the input maximum brightness value does not correspond to any of the preset maximum brightness values, the monochromatic preset determiner may provide preset offset values corresponding to at least two preset maximum brightness values, and the monochromatic reference offset provider may further include a monochromatic reference offset generator configured to generate a reference offset value by interpolating the preset offset values corresponding to at least two preset maximum brightness values.

[0021] The preset maximum brightness values may include the maximum value and the minimum value of the acceptable input maximum brightness values.

[0022] The preset maximum brightness values may further include a first intermediate maximum brightness value. When the input maximum brightness value is a value between the maximum value and the first intermediate maximum brightness value, the grayscale voltage corresponding to the converted grayscale value may be adjusted corresponding to the input maximum brightness value.

[0023] When the input maximum brightness value is a value between the minimum value and the first intermediate maximum brightness value, the emission period of the target pixel may be adjusted corresponding to the input maximum brightness value.

[0024] The preset maximum brightness values may further include a second intermediate maximum brightness value which is a value between the first intermediate maximum brightness value and the minimum value.

[0025] According to an exemplary embodiment of the present invention concept, for a driving method of a display device, the display device may include a target pixel configured to emit light of a first color, a second color viewing pixel positioned adjacent to the target pixel and configured to emit light of a second color different from the first color, and a third color viewing pixel positioned adjacent to the target pixel and configured to emit light of a third color different from the first and second colors. The driving method may include: receiving an input gray value corresponding to the target pixel, a second color viewing gray value corresponding to the second color viewing pixel, and a third color viewing gray value corresponding to the third color viewing pixel; determining the number of second color emitting pixels by counting the number of second color viewing gray values exceeding a reference value; determining the number of third color emitting pixels by counting the number of third color viewing gray values exceeding the reference value, and generating a converted gray value by converting the input gray value based on the number of second color emitting pixels and the number of third color emitting pixels.

[0026] When generating the converted gray value, when the number of second color emitting pixels is 0 and the number of third color emitting pixels is 0, the converted gray value may be generated by adding a monochromatic offset value to the input gray value.

[0027] When generating the converted gray value, when the number of second color emitting pixels is greater than 0 and the number of third color emitting pixels is 0, the converted gray value may be generated by adding a double color mixing offset value to the input gray value.

[0028] When generating the converted gray value, when the number of second color emitting pixels is greater than 0, the number of third color emitting pixels is greater than 0, and the number of second color emitting pixels and the number of third color emitting pixels are not equal to the number of second color viewing pixels and the number of third color viewing pixels respectively, the converted gray value may be generated by adding a triple color mixing offset value to the input gray value.

[0029] When generating the converted gray value, when the number of second color emitting pixels is equal to the number of second color viewing pixels and the number of third color emitting pixels is equal to the number of the third color viewing pixels, the input gray value may be determined as the converted gray value.

[0030] The display panel may also be configured to receive an input gray value from a processor, and when the input gray value of the target pixel exceeds a reference value, the display panel may apply a first data voltage and a second data voltage.

[0031] According to an exemplary embodiment of the inventive concept, a display panel may include a target pixel, a second color observation pixel, a third color observation pixel, and a gray-scale corrector. The target pixel is connected to a first scan line and a first data line and is configured to emit light of a first color. The second color observation pixel is positioned adjacent to the target pixel, is connected to a scan line adjacent to the first scan line, and is configured to emit light of a second color different from the first color. The third color observation pixel is positioned adjacent to the target pixel, is connected to the first scan line or the first data line, and is configured to emit light of a third color different from the first color and the second color. The gray-scale corrector is configured to convert an input gray-scale value corresponding to the target pixel into a converted gray-scale value based on whether the second color observation pixel and the third color observation pixel are in an emission state. When the corresponding gray-scale value exceeds a reference value, the pixel is in the emission state.

[0032] There may be no other pixels between the target pixel and the second color observation pixel and between the target pixel and the third color observation pixel.

[0033] The number of second color light-emitting pixels may be the number of second color observation pixels in the emission state, the number of third color light-emitting pixels may be the number of third color observation pixels in the emission state, and the converted gray-scale value may be generated based on the number of second color light-emitting pixels and the number of third color light-emitting pixels.

[0034] When the number of second color light-emitting pixels is equal to the total number of second color observation pixels and the number of third color light-emitting pixels is equal to the total number of third color observation pixels, the input gray-scale value may be determined as the converted gray-scale value.

[0035] When the number of second color light-emitting pixels is not equal to the total number of second color observation pixels or the number of third color light-emitting pixels is not equal to the total number of third color observation pixels, the input gray-scale value added with an offset value may be determined as the converted gray-scale value. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and other features of the inventive concept will be more clearly understood by referring to the following detailed description of the exemplary embodiments of the inventive concept with reference to the accompanying drawings.

[0037] Figure 1 is a diagram showing a display device according to an exemplary embodiment of the inventive concept.

[0038] Figure 2 is a diagram showing an exemplary embodiment of the inventive concept Figure 1 of the pixels of the display device shown in.

[0039] Figure 3 is a diagram showing an exemplary embodiment of the inventive concept Figure 2A diagram of a method for driving pixels shown therein.

[0040] Figure 4 A diagram showing a display device according to an exemplary embodiment of the inventive concept.

[0041] Figure 5 A diagram showing an exemplary embodiment of the inventive concept Figure 4 A diagram of pixels of the display device shown therein.

[0042] Figure 6 A diagram showing an exemplary embodiment of the inventive concept Figure 5 A diagram of a method for driving pixels shown therein.

[0043] Figure 7 A diagram showing a grayscale voltage generator according to an exemplary embodiment of the inventive concept.

[0044] Figure 8 A diagram showing an exemplary embodiment of the inventive concept Figure 7 A diagram of a part of the grayscale voltage generator shown therein.

[0045] Figure 9 and Figure 10 A diagram showing a case where a pixel emits white light according to a maximum brightness value according to an exemplary embodiment of the inventive concept.

[0046] Figure 11 A diagram showing white light curves and monochromatic light curves at an arbitrary maximum brightness value according to an exemplary embodiment of the inventive concept.

[0047] Figures 12 to 26 A diagram showing an observation pixel, unit area, monochromatic, double color mixing, triple color mixing, and white according to the color of a target pixel according to an exemplary embodiment of the inventive concept.

[0048] Figure 27 A diagram showing a grayscale corrector according to an exemplary embodiment of the inventive concept.

[0049] Figures 28 to 30 A diagram showing a monochromatic offset provider according to an exemplary embodiment of the inventive concept.

[0050] Figure 31 A diagram showing a configuration of an offset value according to an exemplary embodiment of the inventive concept.

[0051] Figure 32 A diagram showing an effect obtained by applying a monochromatic offset value according to an exemplary embodiment of the inventive concept.

[0052] Figure 33 andFigure 34 FIG. is a diagram showing a monochromatic reference offset provider according to an exemplary embodiment of the inventive concept.

[0053] Figures 35 to 38 FIG. is a diagram showing a first dual-color mixing offset provider and a first triple-color mixing offset provider according to an exemplary embodiment of the inventive concept.

[0054] Figures 39 to 42 FIG. is a diagram showing a second dual-color mixing offset provider and a second triple-color mixing offset provider according to an exemplary embodiment of the inventive concept.

[0055] Figures 43 to 46 FIG. is a diagram showing a third dual-color mixing offset provider and a third triple-color mixing offset provider according to an exemplary embodiment of the inventive concept. DETAILED DESCRIPTION

[0056] Exemplary embodiments of the inventive concept provide a display device and a driving method thereof that can present a desired brightness even when emitting monochromatic light and mixed-color light in addition to white light.

[0057] Hereinafter, exemplary embodiments of the inventive concept will be described more fully with reference to the accompanying drawings. Throughout this application, like reference numerals indicate like elements.

[0058] Figure 1 FIG. is a diagram showing a display device according to an exemplary embodiment of the inventive concept.

[0059] Referring to Figure 1 , a display device according to an exemplary embodiment of the inventive concept may include a processor 9 and a display panel 10. For example, the display panel 10 may include a timing controller 11, a data driver 12, a scan driver 13, a pixel unit 14, a grayscale voltage generator 15, and a grayscale corrector 16.

[0060] The processor 9 may provide grayscale values and control signals regarding an image frame. The processor 9 may be an application processor, a central processing unit (CPU), a graphics processing unit (GPU), etc. The processor 9 may provide grayscale values to match the structure of the pixel unit 14 (e.g., a pentile structure or an RGB stripe structure). For example, the processor 9 may provide grayscale values to correspond one-to-one with the pixels RPij included in the pixel unit 14. The processor 9 may also provide grayscale values regardless of the structure of the pixel unit 14. The processor 9 may provide a red grayscale value, a green grayscale value, and a blue grayscale value with respect to one point. The number of grayscale values may be different from the number of grayscale values of the pixels RPij included in the pixel unit 14.

[0061] The timing controller 11 can receive the grayscale values and control signals of an image frame from the processor 9. When the processor 9 provides the grayscale values to be matched with the structure of the pixel unit 14, the timing controller 11 can provide the received grayscale values to the grayscale corrector 16. When the processor 9 provides the grayscale values regardless of the structure of the pixel unit 14, the timing controller 11 can generate the grayscale values rendered to be in one-to-one correspondence with the pixels included in the pixel unit 14 by rendering the received grayscale values, and provide the rendered grayscale values to the grayscale corrector 16.

[0062] The grayscale corrector 16 can provide the converted grayscale values by correcting the grayscale values.

[0063] The timing controller 11 can provide such converted grayscale values and control signals to the data driver 12. Additionally, the timing controller 11 can provide a clock signal, a scan start signal, etc. to the scan driver 13.

[0064] The data driver 12 can generate the data voltages to be provided to the data lines DL1, DL2, DL3, ... and DLn by using the converted grayscale values and control signals received from the timing controller 11. For example, the data driver 12 can sample the converted grayscale values by using the clock signal, and apply the data voltages corresponding to the converted grayscale values to the data lines DL1 to DLn in units of pixel rows. Here, n can be an integer greater than 0. The data voltages can correspond to the grayscale voltages RV0 to RV255, GV0 to GV255, and BV0 to BV255 provided by the grayscale voltage generator 15.

[0065] In other words, different data voltages can be generated based on the converted grayscale values. The grayscale value of a pixel can be compared with a reference value to determine the emission state of the pixel. Different grayscale values result in different converted grayscale values. Thus, for example, when the input grayscale value for a target pixel exceeds the reference value and the grayscale value for an observation pixel adjacent to the target pixel exceeds the reference value, a first data voltage can be generated and applied to the target pixel. When the input grayscale value exceeds the reference value and at least one of the grayscale values for the observation pixels does not exceed the reference value, a second data voltage different from the first data voltage can be generated and applied to the target pixel. A more detailed description will be provided below with reference to Figures 12 to 46 This will be described in more detail.

[0066] The scan driver 13 can generate scan signals to be provided to the scan lines SL1, SL2, SL3, ... and SLm by receiving a clock signal, a scan start signal, etc. from the timing controller 11. For example, the scan driver 13 can sequentially provide scan signals having pulses of an on level to the scan lines SL1 to SLm. For example, the scan driver 13 can be configured in the form of a shift register and generate scan signals in such a manner that a scan start signal in the form of a pulse of an on level is sequentially transmitted to the next scan stage circuit in response to the clock signal. Here, m can be an integer greater than 0.

[0067] The pixel unit 14 includes pixels. Each pixel RPij can be coupled to a corresponding data line and a corresponding scan line. Here, i and j can be integers greater than 0. The pixel RPij can indicate a pixel coupled to the i-th scan line and the j-th data line.

[0068] The pixel unit 14 can include pixels that emit light of a first color, pixels that emit light of a second color, and pixels that emit light of a third color. The first color, the second color, and the third color can be different from each other. For example, the first color can be one of red, green, and blue, the second color can be another color different from the first color among red, green, and blue, and the third color can be another color different from the first color and the second color among red, green, and blue. Additionally, magenta, cyan, and yellow can be used instead of red, green, and blue as the first to third colors. However, for the convenience of description, the case where red, green, and blue are used as the first to third colors is described, magenta is represented as a combination of red and blue, cyan is represented as a combination of green and blue, and yellow is represented as a combination of red and green.

[0069] Hereinafter, the case where the pixel unit 14 is arranged in a diamond pentile structure is assumed and described. However, even if the pixel unit 14 is arranged in another structure, for example, an RGB stripe structure, an S stripe structure, a true RGB structure, a normal pentile structure, etc., those skilled in the art can implement the inventive concept by appropriately setting the target pixel and the observation pixel to be described later.

[0070] Hereinafter, the position of the pixel RPij is described with respect to the position of each light-emitting diode (especially the emission layer). The position of the pixel circuit coupled to each light-emitting diode may not correspond to the position of the light-emitting diode, and the pixel circuit and the light-emitting diode can be appropriately arranged to achieve spatial efficiency.

[0071] The grayscale voltage generator 15 can receive an input maximum brightness value DBVI, and provide grayscale voltages RV0 to RV255 for pixels of a first color corresponding to the input maximum brightness value DBVI, grayscale voltages GV0 to GV255 for pixels of a second color corresponding to the input maximum brightness value DBVI, and grayscale voltages BV0 to BV255 for pixels of a third color corresponding to the input maximum brightness value DBVI. Hereinafter, for convenience of description, a case where there are a total of 256 grayscales from grayscale 0 (minimum grayscale) to grayscale 255 (maximum grayscale) is described. However, when the grayscale value is represented by eight or more bits, there may be a larger number of grayscales.

[0072] The maximum brightness value may be the brightness value of the light emitted from the pixels corresponding to the maximum grayscale. For example, the maximum brightness value may be the brightness value of the white light generated when the pixels of the first color emit light corresponding to grayscale 255, the pixels of the second color emit light corresponding to grayscale 255, and the pixels of the third color emit light corresponding to grayscale 255. The pixels of the first color, the second color, and the third color constitute one point. The unit of the brightness value may be nits.

[0073] Therefore, the pixel unit 14 can display an image frame that is (spatially) dark or bright, but the maximum brightness of the image frame is limited to the maximum brightness value. This maximum brightness value can be set manually by the user's operation with respect to the display panel 10, or automatically set by an algorithm associated with an illumination sensor or the like. The set maximum brightness value is represented as the input maximum brightness value.

[0074] The maximum brightness value may vary according to the product. However, for example, the maximum value of the maximum brightness value may be 1200 nits, and the minimum value of the maximum brightness value may be 4 nits. When the input maximum brightness value DBVI changes with respect to the same grayscale value, the grayscale voltage generator 15 provides other grayscale values RV0 to RV255, GV0 to GV255, and BV0 to BV255, and thus, the emission brightness of the pixels changes.

[0075] The grayscale corrector 16 can correct the input grayscale value to the converted grayscale value as described above. A detailed description of the grayscale corrector 16 will be made with reference to Figure 15 will be described in detail.

[0076] In the above exemplary embodiment, a case where the gray scale corrector 16 is a component separate from the timing controller 11 is shown. However, in an exemplary embodiment of the inventive concept, part or all of the gray scale corrector 16 may be configured integrally with the timing controller 11. For example, part or all of the gray scale corrector 16 may be configured in the form of an integrated circuit together with the timing controller 11. In an exemplary embodiment of the inventive concept, part or all of the gray scale corrector 16 may be implemented in software in the timing controller 11.

[0077] In an exemplary embodiment of the inventive concept, part or all of the gray scale corrector 16 may be configured in the form of an integrated circuit together with the data driver 12. In an exemplary embodiment of the inventive concept, part or all of the gray scale corrector 16 may be implemented in software in the data driver 12. Accordingly, the timing controller 11 may provide an input gray scale value to the data driver 12, and the gray scale corrector 16 or the data driver 12 may automatically correct the input gray scale value to a converted gray scale value.

[0078] In an exemplary embodiment of the inventive concept, part or all of the gray scale corrector 16 may be configured in the form of an integrated circuit together with the processor 9. In an exemplary embodiment of the inventive concept, part or all of the gray scale corrector 16 may be implemented in software in the processor 9. Accordingly, the timing controller 11 may directly receive the converted gray scale value from the processor 9.

[0079] Figure 2 is a diagram showing Figure 1 the pixels of the display device shown in an exemplary embodiment according to the inventive concept. Figure 3 is a diagram showing Figure 2 the driving method of the pixels shown in an exemplary embodiment according to the inventive concept.

[0080] The pixel RPij may be a pixel that emits light of a first color. Except for the light emitting diode R_LD1, pixels that emit light of a second color or a third color include components substantially the same as the pixel RPij, and thus, repeated descriptions will be omitted.

[0081] The pixel RPij may include a plurality of transistors T1 and T2, a storage capacitor Cst1, and a light emitting diode R_LD1.

[0082] Although a case where the transistors are implemented with P-type transistors (e.g., PMOS transistors) is shown in the present exemplary embodiment, those skilled in the art may use NMOS transistors to implement a pixel circuit that performs substantially the same function.

[0083] The gate electrode of transistor T2 is coupled to scan line SLi, one electrode of transistor T2 is coupled to data line DLj, and the other electrode of transistor T2 is coupled to the gate electrode of transistor T1. Transistor T2 may be referred to as a scan transistor, a switching transistor, etc.

[0084] The gate electrode of transistor T1 is coupled to the other electrode of transistor T2, one electrode of transistor T1 is coupled to first power supply line ELVDD, and the other electrode of transistor T1 is coupled to the anode of light-emitting diode R_LD1. Transistor T1 may be referred to as a driving transistor.

[0085] Storage capacitor Cst1 couples one electrode and the gate electrode of transistor T1 to each other.

[0086] The anode of light-emitting diode R_LD1 is coupled to the other electrode of transistor T1, and the cathode of light-emitting diode R_LD1 is coupled to second power supply line ELVSS. Light-emitting diode R_LD1 may be a device that emits light having a wavelength corresponding to a first color. Light-emitting diode R_LD1 may be implemented by an organic light-emitting diode, an inorganic light-emitting diode, a quantum dot light-emitting diode, etc. Figure 2 The pixel RPij shown includes a single light-emitting diode R_LD1. However, in an exemplary embodiment of the inventive concept, pixel RPij may include a plurality of light-emitting diodes. The plurality of light-emitting diodes may be coupled in parallel with the same polarity, or coupled in parallel with different polarities.

[0087] When a scan signal having a conductive level (low level) is supplied to the gate electrode of transistor T2 through scan line SLi, transistor T2 couples data line DLj and one electrode of storage capacitor Cst1 to each other. Accordingly, a voltage value according to the difference between the data voltage DATAij applied through data line DLj and the first power supply voltage is stored in storage capacitor Cst1. Data voltage DATAij may correspond to one of gray scale voltages RV0 to RV255.

[0088] Transistor T1 allows a driving current determined according to the voltage stored in storage capacitor Cst1 to flow from first power supply line ELVDD to second power supply line ELVSS. Light-emitting diode R_LD1 emits light having a brightness corresponding to the amount of driving current.

[0089] Figure 4 is a diagram showing a display device according to an exemplary embodiment of the inventive concept.

[0090] Except for emission driver 17 and pixel unit 14', Figure 4 the display panel 10' shown in may include a configuration substantially the same as that of display panel 10 shown in Figure 1 Accordingly, repeated descriptions will be omitted.

[0091] The emission driver 17 can generate emission signals to be provided to the emission lines EL1, EL2, EL3, ... and ELo by receiving a clock signal, an emission stop signal, etc. from the timing controller 11. For example, the emission driver 17 can sequentially provide emission signals of pulses having an off level to the emission lines EL1 to ELo. For example, the emission driver 17 can be configured in the form of a shift register and generate emission signals in such a way that an emission stop signal is sequentially transmitted to the next scan stage circuit in the form of a pulse of an off level in response to the clock signal. Here, o can be a natural number.

[0092] The pixel unit 14' can include pixels. Each pixel RPij' can be coupled to a corresponding data line, a corresponding scan line, and a corresponding emission line.

[0093] Figure 5 is a diagram showing the pixels of the display device shown in Figure 4 an exemplary embodiment according to the inventive concept.

[0094] Referring to Figure 5 , the pixel RPij' can include transistors M1, M2, M3, M4, M5, M6, and M7, a storage capacitor Cst2, and a light emitting diode R_LD2.

[0095] One electrode of the storage capacitor Cst2 is coupled to the first power supply line ELVDD, and the other electrode of the storage capacitor Cst2 is coupled to the gate electrode of the transistor M1.

[0096] One electrode of the transistor M1 is coupled to the other electrode of the transistor M5, the other electrode of the transistor M1 is coupled to one electrode of the transistor M6, and the gate electrode of the transistor M1 is coupled to the other electrode of the storage capacitor Cst2. The transistor M1 can be referred to as a driving transistor. The transistor M1 determines the amount of driving current flowing between the first power supply line ELVDD and the second power supply line ELVSS according to the potential difference between its gate electrode and source electrode.

[0097] One electrode of the transistor M2 is coupled to the data line DLj, the other electrode of the transistor M2 is coupled to one electrode of the transistor M1, and the gate electrode of the transistor M2 is coupled to the current scan line SLi. The transistor M2 can be referred to as a switching transistor, a scan transistor, etc. When a scan signal of an on level is applied to the current scan line SLi, the transistor M2 allows the data voltage of the data line DLj to be input to the pixel RPij'.

[0098] One electrode of transistor M3 is coupled to another electrode of transistor M1, another electrode of transistor M3 is coupled to the gate electrode of transistor M1, and the gate electrode of transistor M3 is coupled to the current scan line SLi. When a scan signal of conduction level is applied to the current scan line SLi, transistor M3 allows transistor M1 to be diode-coupled.

[0099] One electrode of transistor M4 is coupled to the gate electrode of transistor M1, another electrode of transistor M4 is coupled to the initialization voltage line VINT, and the gate electrode of transistor M4 is coupled to the previous scan line SL(i - 1). In an exemplary embodiment of the inventive concept, the gate electrode of transistor M4 may be coupled to another scan line. When a scan signal of conduction level is applied to the previous scan line SL(i - 1), transistor M4 initializes the charge amount of the gate electrode of transistor M1 by transmitting the initialization voltage to the gate electrode of transistor M1.

[0100] One electrode of transistor M5 is coupled to the first power supply line ELVDD, another electrode of transistor M5 is coupled to one electrode of transistor M1, and the gate electrode of transistor M5 is coupled to the emission line ELi. One electrode of transistor M6 is coupled to another electrode of transistor M1, another electrode of transistor M6 is coupled to the anode of the light-emitting diode R_LD2, and the gate electrode of transistor M6 is coupled to the emission line ELi. Transistors M5 and M6 may be referred to as emission transistors. When an emission signal of conduction level is applied to the emission line ELi, transistors M5 and M6 allow the light-emitting diode R_LD2 to emit light by forming a drive current path between the first power supply line ELVDD and the second power supply line ELVSS.

[0101] One electrode of transistor M7 is coupled to the anode of the light-emitting diode R_LD2, another electrode of transistor M7 is coupled to the initialization voltage line VINT, and the gate electrode of transistor M7 is coupled to the current scan line SLi. In an exemplary embodiment of the inventive concept, the gate electrode of transistor M7 may be coupled to another scan line. For example, the gate electrode of transistor M7 may be coupled to the previous scan line SL(i - 1) or the previous scan line before the previous scan line SL(i - 1), or the next scan line SL(i + 1) or the next scan line after the next scan line SL(i + 1). When a scan signal of conduction level is applied to the current scan line SLi, transistor M7 initializes the charge amount accumulated in the light-emitting diode R_LD2 by transmitting the initialization voltage to the anode of the light-emitting diode R_LD2.

[0102] The anode of the light-emitting diode R_LD2 is coupled to the other electrode of the transistor M6, and the cathode of the light-emitting diode R_LD2 is coupled to the second power supply line ELVSS. The light-emitting diode R_LD2 can be implemented by an organic light-emitting diode, an inorganic light-emitting diode, a quantum dot light-emitting diode, etc. Figure 5 The pixel RPij' shown in Figure 5 includes a single light-emitting diode R_LD2. However, in an exemplary embodiment of the inventive concept, the pixel RPij' may include a plurality of light-emitting diodes. The plurality of light-emitting diodes may be coupled in parallel with the same polarity or in parallel with different polarities.

[0103] Figure 6 is a diagram showing Figure 5 a driving method of the pixel shown in an exemplary embodiment according to the inventive concept.

[0104] First, a scan signal at a conductive level (low level) is applied to the previous scan line SL(i - 1). Since the transistor M4 is in the conductive state, an initialization voltage is applied to the gate electrode of the transistor M1, thereby initializing the charge amount. Since a turn-off level emission signal is applied to the emission line ELi, the transistors M5 and M6 are in the off state, and unnecessary emission of the light-emitting diode R_LD2 during the application of the initialization voltage is prevented.

[0105] Next, the data voltage DATAij for the current pixel row is applied to the data line DLj, and a scan signal at a conductive level is applied to the current scan line SLi. Accordingly, the transistors M2, M1, and M3 are in the conductive state, and the data line DLj and the gate electrode of the transistor M1 are electrically coupled to each other. Therefore, the data voltage DATAij is applied to the other electrode of the storage capacitor Cst2, and the storage capacitor Cst2 accumulates a charge amount corresponding to the difference between the voltage of the first power supply line ELVDD and the data voltage DATAij.

[0106] Since the transistor M7 is in the conductive state, the anode of the light-emitting diode R_LD2 and the initialization voltage line VINT are coupled to each other, and a charge amount corresponding to the difference between the initialization voltage of the light-emitting diode R_LD2 and the voltage of the second power supply line ELVSS is pre-charged or initialized.

[0107] Subsequently, when a turn-on level emission signal is applied to the emission line ELi, the transistors M5 and M6 are in the conductive state, and the drive current flowing through the transistor M1 is controlled according to the charge amount accumulated in the storage capacitor Cst2, whereby a drive current flows through the light-emitting diode R_LD2. The light-emitting diode R_LD2 emits light until a turn-off level emission signal is applied to the emission line ELi.

[0108] Figure 7It is a diagram showing a grayscale voltage generator according to an exemplary embodiment of the present invention concept.

[0109] Referring to Figure 7 , the grayscale voltage generator 15 may include a first grayscale voltage generator 151, a second grayscale voltage generator 152, and a third grayscale voltage generator 153.

[0110] The first grayscale voltage generator 151 may receive an input maximum brightness value DBVI and provide grayscale voltages RV0 to RV255 for pixels of a first color corresponding to the input maximum brightness value DBVI.

[0111] The second grayscale voltage generator 152 may receive an input maximum brightness value DBVI and provide grayscale voltages GV0 to GV255 for pixels of a second color corresponding to the input maximum brightness value DBV1.

[0112] The third grayscale voltage generator 153 may receive an input maximum brightness value DBVI and provide grayscale voltages BV0 to BV255 for pixels of a third color corresponding to the input maximum brightness value DBVI.

[0113] Figure 8 It is a diagram showing a part of the grayscale voltage generator according to an exemplary embodiment of the present invention concept Figure 7 as shown in

[0114] Referring to Figure 8 , the first grayscale voltage generator 151 may include a selection value provider 1511, a grayscale voltage output unit 1512, resistor strings RS1 to RS11, multiplexers MX1 to MX12, and resistors R1 to R10.

[0115] Each of the second grayscale voltage generator 152 and the third grayscale voltage generator 153 may include a configuration substantially the same as that of the first grayscale voltage generator 151, and thus, repeated descriptions will be omitted.

[0116] The selection value provider 1511 may provide selection values for the multiplexers MX1 to MX12 according to the input maximum brightness value DBVI. The selection values according to the input maximum brightness value DBVI may be pre-stored in a storage device (such as a register device).

[0117] The resistor string RS1 may generate an intermediate voltage between a first reference voltage VH and a second reference voltage VL. The multiplexer MX1 may output a third reference voltage VT by selecting one of the intermediate voltages provided from the resistor string RS1 according to the selection value. The multiplexer MX2 may output a 255 - grayscale voltage RV255 by selecting one of the intermediate voltages provided from the resistor string RS1 according to the selection value.

[0118] The resistor string RS11 can generate an intermediate voltage between the third reference voltage VT and the 255-gray-scale voltage RV255. The multiplexer MX12 can output the 203-gray-scale voltage RV203 by selecting one of the intermediate voltages provided by the resistor string RS11 according to the selection value.

[0119] The resistor string RS10 can generate an intermediate voltage between the third reference voltage VT and the 203-gray-scale voltage RV203. The multiplexer MX11 can output the 151-gray-scale voltage RV151 by selecting one of the intermediate voltages provided by the resistor string RS10 according to the selection value.

[0120] The resistor string RS9 can generate an intermediate voltage between the third reference voltage VT and the 151-gray-scale voltage RV151. The multiplexer MX10 can output the 87-gray-scale voltage RV87 by selecting one of the intermediate voltages provided by the resistor string RS9 according to the selection value.

[0121] The resistor string RS8 can generate an intermediate voltage between the third reference voltage VT and the 87-gray-scale voltage RV87. The multiplexer MX9 can output the 51-gray-scale voltage RV51 by selecting one of the intermediate voltages provided by the resistor string RS8 according to the selection value.

[0122] The resistor string RS7 can generate an intermediate voltage between the third reference voltage VT and the 51-gray-scale voltage RV51. The multiplexer MX8 can output the 35-gray-scale voltage RV35 by selecting one of the intermediate voltages provided by the resistor string RS7 according to the selection value.

[0123] The resistor string RS6 can generate an intermediate voltage between the third reference voltage VT and the 35-gray-scale voltage RV35. The multiplexer MX7 can output the 23-gray-scale voltage RV23 by selecting one of the intermediate voltages provided by the resistor string RS6 according to the selection value.

[0124] The resistor string RS5 can generate an intermediate voltage between the third reference voltage VT and the 23-gray-scale voltage RV23. The multiplexer MX6 can output the 11-gray-scale voltage RV11 by selecting one of the intermediate voltages provided by the resistor string RS5 according to the selection value.

[0125] The resistor string RS4 can generate an intermediate voltage between the first reference voltage VH and the 11-gray-scale voltage RV11. The multiplexer MX5 can output the 7-gray-scale voltage RV7 by selecting one of the intermediate voltages provided by the resistor string RS4 according to the selection value.

[0126] The resistor string RS3 can generate an intermediate voltage between the first reference voltage VH and the 7-gray scale voltage RV7. The multiplexer MX4 can output the 1-gray scale voltage RV1 by selecting one of the intermediate voltages provided from the resistor string RS3 according to a selection value.

[0127] The resistor string RS2 can generate an intermediate voltage between the first reference voltage VH and the 1-gray scale voltage RV1. The multiplexer MX3 can output the 0 gray scale voltage RV0 by selecting one of the intermediate voltages provided from the resistor string RS2 according to a selection value.

[0128] The above gray scales 0, 1, 7, 11, 23, 35, 51, 87, 151, 203, and 255 can be referred to as reference gray scales. Additionally, the gray scale voltages RV0, RV1, RV7, RV11, RV23, RV35, RV51, RV87, RV151, RV203, and RV255 generated from the multiplexers MX2 to MX12 can be referred to as reference gray scale voltages. Depending on the product, multiple reference gray scale levels and the number of gray scales corresponding to the reference gray scale levels can be set differently. Hereinafter, for the convenience of description, the gray scales 0, 1, 7, 11, 23, 35, 51, 87, 151, 203, and 255 are described as reference gray scales.

[0129] The gray scale voltage output unit 1512 can generate all gray scale voltages RV0 to RV255 by dividing the reference gray scale voltages RV0, RV1, RV7, RV11, RV23, RV35, RV51, RV87, RV151, RV203, and RV255. For example, the gray scale voltage output unit 1512 can generate the gray scale voltages RV2 to RV6 by dividing the reference gray scale voltages RV1 and RV7.

[0130] Figure 9 and Figure 10 are diagrams showing a case where a pixel emits white light according to a maximum luminance value in an exemplary embodiment according to the concept of the present invention.

[0131] Referring to Figure 9 , an arrangement example of the pixel unit 14 is partially shown. As described above, in Figure 9 , the pixels are shown based on the positions of the light-emitting diodes of the pixel unit 14, and the scan lines SL1 to SL7 and the data lines DL1 to DL7 are shown to describe the electrical coupling relationship of the pixel unit 14.

[0132] Pixels RP22, RP26, RP44, RP62, and RP66 may be pixels that emit light of a first color. Pixels GP11, GP13, GP15, GP17, GP31, GP33, GP35, GP37, GP51, GP53, GP55, GP57, GP71, GP73, GP75, and GP77 may be pixels that emit light of a second color. Pixels BP24, BP42, BP46, and BP64 may be pixels that emit light of a third color.

[0133] In an exemplary embodiment of the inventive concept, data voltages corresponding to grayscale voltages may be alternately applied to first group of data lines DL1, DL3, DL5, and DL7 and a second group of data lines DL2, DL4, and DL6.

[0134] For example, data voltages corresponding to the first color may be applied to the first group of data lines DL1, DL3, DL5, and DL7. When a scan signal of an active level is applied to scan line SL1, the corresponding data voltage is written into pixels GP11, GP13, GP15, and GP17. When a scan signal of an active level is applied to scan line SL3, the corresponding data voltage is written into pixels GP31, GP33, GP35, and GP37. When a scan signal of an active level is applied to scan line SL5, the corresponding data voltage is written into pixels GP51, GP53, GP55, and GP57. When a scan signal of an active level is applied to scan line SL7, the corresponding data voltage is written into pixels GP71, GP73, GP75, and GP77.

[0135] In addition, data voltages corresponding to the second color or the third color are applied to the second group of data lines DL2, DL4, and DL6. When a scan signal of an active level is applied to scan line SL2, the corresponding data voltage is written into pixels RP22, BP24, and RP26. When a scan signal of an active level is applied to scan line SL4, the corresponding data voltage is written into pixels BP42, RP44, and BP46. When a scan signal of an active level is applied to scan line SL6, the corresponding data voltage is written into pixels RP62, BP64, and RP66.

[0136] Figure 10 White light curves WC1, WC2, ..., WC(k - 1), and WCk showing output luminance with respect to an input grayscale value are shown. Here, k may be an integer greater than 0.

[0137] The maximum luminance values of the white light curves WC1 to WCk may be different from each other. For example, the maximum luminance (e.g., 4 nits) of the white light curve WC1 may be the lowest, and the maximum luminance value (e.g., 1200 nits) of the white light curve WCk may be the highest.

[0138] To generate white light, it is assumed that the pixels of pixel unit 14 receive data voltages corresponding to the same gray scale.

[0139] In Figure 10 The virtual points shown on the white light curves WC1 to WCk shown in may correspond to the selection values pre-stored in the above-mentioned selection value provider 1511. As the number of selection values increases, a more precise white light curve can be directly represented. However, physical devices (such as multiplexers, registers, etc.) corresponding to the increasing number of selection values may be further required, and thus there are limitations. Accordingly, the selection values with respect to the above-mentioned reference gray scale voltage can be pre-stored and used, and other gray scale voltages can be generated by dividing the reference gray scale voltage. Additionally, for the same reason, the selection values with respect to some maximum luminance values (e.g., reference maximum luminance value) between 4 nits and 1200 nits can be pre-stored and used, and other maximum luminance values can be generated by interpolating the selection values.

[0140] The pre-stored selection values can be set for each individual product through multiple-time programming (MTP). In other words, the selection values can be set by repeated measurement to be stored in the product, whereby white light with a desired luminance can be emitted with respect to the gray scale values.

[0141] In other words, the pre-stored selection values can be values set with respect to white light. As described above, when using the set gray scale voltage to emit mixed-color light or monochromatic light instead of white light, the luminance of the mixed-color light or monochromatic light does not precisely correspond to the desired gamma curve. The gamma curve can correspond to the white light curve.

[0142] Figure 11 is a diagram showing the white light curve and the monochromatic light curve at an arbitrary maximum luminance value according to an exemplary embodiment of the inventive concept.

[0143] As described above, when emitting monochromatic light instead of white light using the set gray scale voltage, the luminance of the monochromatic light does not precisely correspond to the desired gamma curve. The gamma curve can correspond to the white light curve WC. Additionally, due to the insufficient luminance difference between low gray scales, the low gray scales appear insufficient.

[0144] The gamma curve generally can follow the following mathematical formula 1.

[0145] Mathematical formula 1

[0146] y = ax GM + b

[0147] Here, x can be the gray scale value, y can be the luminance value, a and b can be arbitrary constants, and GM can be the gamma value.

[0148] In the following, for the convenience of description, constants a and b are ignored, and the shape of the curve is described using the gamma value GM. When the gamma value is equal to 1, a straight line is drawn instead of a curve, and as the gamma value is greater than 1, the x-axis becomes convex near the curve.

[0149] Therefore, the gamma value of the first monochromatic light curve RWC can be greater than the gamma value of the white light curve WC. Additionally, the gamma value of the second monochromatic light curve GWC can be greater than the gamma value of the white monochromatic light curve WC and less than the gamma value of the first monochromatic light curve RWC. Additionally, the gamma value of the third monochromatic light curve BWC can be less than the gamma value of the white light curve WC. For example, the first color can be red, the second color can be green, and the third color can be blue.

[0150] Therefore, although the same input gray value is exhibited when emitting monochromatic light and white light, the selection values of the selection value provider 1511 are preferably different from each other. However, as described above, when directly increasing the selection value of the selection value provider 1511, a physical device such as a multiplexer is also required, which is not preferred.

[0151] Accordingly, in the present exemplary embodiment, the following method is provided, that is, the method is used to check whether a unit area emits monochromatic light, dual mixed light, triple mixed light, or white light, and if necessary, correct the input gray value to a converted gray value. When using this method, it is not necessary to modify the existing gray voltage generator 15, and thus, the product configuration of the display device can be easily achieved.

[0152] Take Figure 11 the case shown as an example for illustration. The gamma value of the first monochromatic light curve RWC is reduced by correcting the input gray value, thereby enabling the first monochromatic light curve RWC to be adjusted to become similar to the white light curve WC.

[0153] Similarly, the gamma value of the second monochromatic light curve GWC is reduced by correcting the input gray value, thereby enabling the second monochromatic light curve GWC to be adjusted to become similar to the white light curve WC. The reduction of the gamma value of the second monochromatic curve GWC can be less than the reduction of the gamma value of the first monochromatic light curve RWC.

[0154] Similarly, the gamma value of the third monochromatic light curve BWC is reduced by correcting the input gray value, thereby enabling the third monochromatic light curve BWC to be adjusted to become similar to the white light curve WC.

[0155] According to the above exemplary embodiment, the brightness of monochromatic light can be accurately represented according to the desired gamma curve. Additionally, the low gray performance can be further clarified.

[0156] The above can be equivalently applied to the cases of dual mixed light and triple mixed light. Thus, the input gray values are corrected, whereby the dual mixed light curve can be adjusted to become similar to the white light curve WC. Additionally, the input gray values are corrected, whereby the triple mixed light curve can be adjusted to become similar to the white light curve WC.

[0157] However, in the case of white light, the selection value has been set to be suitable for white light and thus there is no need to separately perform gray correction.

[0158] Figures 12 to 26 FIG. is a diagram showing an observation pixel, unit area, monochromatic, dual mixed, triple mixed, and white according to the color of a target pixel in an exemplary embodiment according to the concept of the present invention.

[0159] Referring to Figures 12 to 16 FIG., a case is shown where the target pixel GP33 is a pixel of a second color.

[0160] The target pixel GP33 can emit light of a second color. The first color observation pixels RP22 and RP44 are positioned adjacent to the target pixel GP33 and can emit light of a first color. The third color observation pixels BP24 and BP42 are positioned adjacent to the target pixel GP33 and can emit light of a third color.

[0161] The unit area OGA can be an area including the target pixel GP33 and the observation pixels RP22, BP24, BP42, and RP44. The observation pixels RP22, BP24, BP42, and RP44 can be set as the pixels positioned at the closest distance from the target pixel GP33. Thus, there are no other pixels between the target pixel GP33 and the observation pixels RP22, BP24, BP42, and RP44. The closest distance can indicate the distance between pixel centers.

[0162] According to their uses, the gray values constituting an image frame can be differently referred to as input gray values and observation gray values. For example, the gray value of the image frame corresponding to the target pixel GP33 can be referred to as an input gray value. The gray values of the image frames corresponding to the first color observation pixels RP22 and RP44 can be referred to as first color observation gray values. Additionally, the gray values of the image frames corresponding to the third color observation pixels BP24 and BP42 can be referred to as third color observation gray values.

[0163] Referring to Figure 12 FIG., in the unit area OGA, the target pixel GP33 is in an emission state, and the observation pixels RP22, BP24, BP42, and RP44 are in a non - emission state. The unit area OGA can emit monochromatic light of a second color.

[0164] Emission and non-emission can be classified according to the gray value. In other words, pixels that receive a gray value exceeding a reference value can be classified as emission pixels (emission state), and pixels that receive a gray value equal to or less than the reference value can be classified as non-emission pixels (non-emission state). For example, the reference value can be gray level 0 or a specific low gray level. The reference value can be appropriately set according to the product.

[0165] Referring to Figure 13 , in the unit area OGA, the target pixel GP33 is in the emission state, the first color observation pixel RP22 is in the emission state, and the other observation pixels BP24, BP42, and RP44 are in the non-emission state. The unit area OGA can emit dual mixed-color light. When the first color is red and the second color is green, Figure 13 the dual mixed-color light in

[0166] Although not shown in the figure, in the unit area OGA, the target pixel GP33 can be in the emission state, the first color observation pixels RP22 and RP44 can be in the emission state, and the other observation pixels BP24 and BP42 can be in the non-emission state. The unit area OGA can emit yellow dual mixed-color light. However, the dual mixed-color light curve in this case can be different from the Figure 13 dual mixed-color light curve in the case shown in

[0167] Referring to Figure 14 , in the unit area OGA, the target pixel GP33 is in the emission state, the third color observation pixel BP24 is in the emission state, and the other observation pixels RP22, BP42, and RP44 are in the non-emission state. The unit area OGA can emit dual mixed-color light. When the second color is green and the third color is blue, Figure 14 the dual mixed-color light in

[0168] Although not shown in the figure, in the unit area OGA, the target pixel GP33 can be in the emission state, the third color observation pixels BP24 and BP42 can be in the emission state, and the other observation pixels RP22 and RP44 can be in the non-emission state. The unit area OGA can emit cyan dual mixed-color light. However, the dual mixed-color light curve in this case can be different from the Figure 14 dual mixed-color light curve in the case shown in

[0169] Referring to Figure 15, in the unit area OGA, the target pixel GP33 is in the emission state, the first color observation pixel RP22 is in the emission state, the third color observation pixel BP24 is in the emission state, and the other observation pixels BP42 and RP44 are in the non-emission state. The unit area OGA can emit triple mixed-color light. However, in the present exemplary embodiment, when all the pixels RP22, BP24, GP33, BP42, and RP44 of the unit area OGA are in the emission state, the light emitted from the unit area OGA is not determined as triple mixed-color light. According to the emission combination of the observation pixels, the triple mixed-color light curves can be different from each other.

[0170] Refer to Figure 16 , which shows the case where all the pixels RP22, BP24, GP33, BP42, and RP44 of the unit area OGA are in the emission state. The unit area OGA can emit white light. White light refers to the light emitted when all the pixels RP22, BP24, GP33, BP42, and RP44 of the unit area OGA are in the emission state, and the input gray value and the observed gray value are not considered. In other words, when all the input gray values and observed gray values of the unit area OGA exceed the reference value, it is determined that the unit area OGA emits white light. As described above, it is not necessary to correct the white light curve separately.

[0171] Refer to Figures 17 to 21 , which shows the case where the target pixel RP44 is a pixel of the first color.

[0172] The target pixel RP44 can emit light of the first color. The second color observation pixels GP33, GP35, GP53, and GP55 are positioned adjacent to the target pixel RP44 and can emit light of the second color. The third color observation pixels BP24, BP42, BP46, and BP64 are located adjacent to the target pixel RP44 and can emit light of the third color.

[0173] In this example, the target pixel RP44 is connected to the scan line SL4 and the data line DL4. The second color observation pixels GP33, GP35, GP53, and GP55 are connected to the scan lines SL3 and SL5 adjacent to the scan line SL4. The third color observation pixels BP24, BP42, BP46, and BP64 are connected to the same scan line or the same data line as the target pixel RP44. For example, the third color observation pixels BP24 and BP64 are connected to the data line DL4. The third color observation pixels BP42 and BP46 are connected to the scan line SL4.

[0174] The unit area ORA can be an area including the target pixel RP44 and the observation pixels BP24, GP33, GP35, BP42, BP46, GP53, GP55, and BP64. The second-color observation pixels GP33, GP35, GP53, and GP55 can be set as the second-color pixels positioned at the closest distance from the target pixel RP44. The third-color observation pixels BP24, BP42, BP46, and BP64 can be set as the third-color pixels positioned at the closest distance from the target pixel RP44. Therefore, there are no other pixels between the target pixel RP44 and the observation pixels BP24, GP33, GP35, BP42, BP46, GP53, GP55, and BP64.

[0175] Refer to Figure 17 , in the unit area ORA, the target pixel RP44 is in the emission state, and the observation pixels BP24, GP33, GP35, BP42, BP46, GP53, GP55, and BP64 are in the non-emission state. The unit area ORA can emit monochromatic light of the first color.

[0176] Refer to Figure 18 , in the unit area ORA, the target pixel RP44 is in the emission state, the second-color observation pixel GP33 is in the emission state, and the other observation pixels BP24, GP35, BP42, BP46, GP53, GP55, and BP64 are in the non-emission state. The unit area ORA can emit dual mixed-color light. When the first color is red and the second color is green, Figure 18 the dual mixed-color light in

[0177] Although not shown in the figure, in the unit area ORA, the target pixel RP44 can be in the emission state, two or more second-color observation pixels can be in the emission state, and the other observation pixels can be in the non-emission state. The unit area ORA can emit dual mixed-color light of yellow. However, the dual mixed-color light curve in this case can be different from the dual mixed-color light curve in the case shown in Figure 18 .

[0178] Refer to Figure 19 , in the unit area ORA, the target pixel RP44 is in the emission state, the third-color observation pixel BP24 is in the emission state, and the other observation pixels GP33, GP35, BP42, BP46, GP53, GP55, and BP64 are in the non-emission state. The unit area ORA can emit dual mixed-color light. When the first color is red and the third color is blue, Figure 19 the dual mixed-color light in

[0179] Although not shown in the figure, in the unit area ORA, the target pixel RP44 may be in the emission state, two or more third color observation pixels may be in the emission state, and other observation pixels may be in the non-emission state. The unit area ORA may emit double mixed-color light of magenta. However, the double mixed-color light curve in this case may be different from the double mixed-color light curve in the case shown in Figure 19 The double mixed-color light curves in the cases shown in

[0180] Referring to Figure 20 , in the unit area ORA, the target pixel RP44 is in the emission state, the second color observation pixel GP33 is in the emission state, the third color observation pixel BP24 is in the emission state, and other observation pixels GP35, BP42, BP46, GP53, GP55, and BP64 are in the non-emission state. The unit area ORA may emit triple mixed-color light. However, in the present exemplary embodiment, when all pixels BP24, GP33, GP35, BP42, RP44, BP46, GP53, GP55, and BP64 of the unit area ORA are in the emission state, the light emitted from the unit area ORA is not determined to be triple mixed-color light. Depending on the emission combination of the observation pixels, the triple mixed-color light curves may be different from each other.

[0181] Referring to Figure 21 , in the unit area ORA, a case where all pixels BP24, GP33, GP35, BP42, RP44, BP46, GP53, GP55, and BP64 are in the emission state is shown. The unit area ORA may emit white light. White light means the light emitted when all pixels BP24, GP33, GP35, BP42, RP44, BP46, GP53, GP55, and BP64 are in the emission state, and the input gray value and the observed gray value are not considered. In other words, when all input gray values and observed gray values of the unit area ORA exceed the reference value, it is determined that the unit area ORA emits white light. As described above, it is not necessary to correct the white light curve separately.

[0182] Referring to Figures 22 to 26 , a case where the target pixel BP64 is a pixel of the third color is shown.

[0183] The target pixel BP64 may emit light of the third color. The first color observation pixels RP44, RP62, RP66, and RP84 are positioned adjacent to the target pixel BP64 and may emit light of the first color. The second color observation pixels GP53, GP55, GP73, and GP75 are positioned adjacent to the target pixel BP64 and may emit light of the second color.

[0184] The unit area OBA may be an area including the target pixel BP64 and the observation pixels RP44, GP53, GP55, RP62, RP66, GP73, GP75, and RP84. The first-color observation pixels RP44, RP62, RP66, and RP84 may be set as the first-color pixels positioned at the closest distance from the target pixel BP64. The second-color observation pixels GP53, GP55, GP73, and GP75 may be set as the second-color pixels positioned at the closest distance from the target pixel BP64. Therefore, there are no other pixels between the target pixel BP64 and the observation pixels RP44, GP53, GP55, RP62, RP66, GP73, GP75, and RP84.

[0185] Referring to Figure 22 , in the unit area OBA, the target pixel BP64 is in the emission state, and the observation pixels RP44, GP53, GP55, RP62, RP66, GP73, GP75, and RP84 are in the non-emission state. The unit area OBA may emit monochromatic light of a third color.

[0186] Referring to Figure 23 , in the unit area OBA, the target pixel BP64 is in the emission state, the first-color observation pixel RP44 is in the emission state, and the other observation pixels GP53, GP55, RP62, RP66, GP73, GP75, and RP84 are in the non-emission state. The unit area OBA may emit double mixed-color light. When the first color is red and the third color is blue, Figure 23 the double mixed-color light in

[0187] Although not shown in the figure, in the unit area OBA, the target pixel BP64 may be in the emission state, two or more first-color observation pixels may be in the emission state, and the other observation pixels may be in the non-emission state. The unit area OBA may emit magenta double mixed-color light. However, the double mixed-color light curve in this case may be different from the double mixed-color light curve in the case shown in Figure 23 .

[0188] Referring to Figure 24 , in the unit area OBA, the target pixel BP64 is in the emission state, the second-color observation pixel GP53 is in the emission state, and the other observation pixels RP44, GP55, RP62, RP66, GP73, GP75, and RP84 are in the non-emission state. The unit area OBA may emit double mixed-color light. When the second color is green and the third color is blue, Figure 24 the double mixed-color light in

[0189] Although not shown in the figures, in the unit area OBA, the target pixel BP64 may be in the emission state, two or more second color observation pixels may be in the emission state, and the other observation pixels may be in the non-emission state. The unit area OBA may emit double mixed-color light of cyan. However, the double mixed-color light curve in this case may be different from the double mixed-color light curve in the case shown in Figure 24 The double mixed-color light curve in the case shown in

[0190] Referring to Figure 25 , in the unit area OBA, the target pixel BP64 is in the emission state, the first color observation pixel RP44 is in the emission state, the second color observation pixel GP53 is in the emission state, and the other observation pixels GP55, RP62, RP66, GP73, GP75, and RP84 are in the non-emission state. The unit area OBA may emit triple mixed-color light. However, in the present exemplary embodiment, when all the pixels RP44, GP53, GP55, RP62, BP64, RP66, GP73, GP75, and RP84 of the unit area OBA are in the emission state, the light emitted from the unit area OBA is not determined as triple mixed-color light. Depending on the emission combination of the observation pixels, the triple mixed-color light curves may be different from each other.

[0191] Referring to Figure 26 , a case where all the pixels RP44, GP53, GP55, RP62, BP64, RP66, GP73, GP75, and RP84 of the unit area OBA are in the emission state is shown. The unit area OBA may emit white light. White light means the light emitted when all the pixels RP44, GP53, GP55, RP62, BP64, RP66, GP73, GP75, and RP84 of the unit area OBA are in the emission state, and the input gray value and the observed gray value are not considered. In other words, when all the input gray values and the observed gray values of the unit area OBA exceed the reference value, it is determined that the unit area OBA emits white light. As described above, it is not necessary to correct the white light curve separately.

[0192] Figure 27 FIG. is a diagram showing a gray corrector according to an exemplary embodiment of the inventive concept.

[0193] Referring to Figure 27 , the gray corrector 16 may include a light-emitting pixel counter 164, a gray converter 165, monochromatic offset providers 1611, 1621, and 1631, double mixed-color offset providers 1612, 1622, and 1632, and triple mixed-color offset providers 1613, 1623, and 1632.

[0194] Hereinafter, for convenience of description, it is assumed that the target pixel emits light of the first color. The gray corrector 16 can convert the input gray value TIG corresponding to the target pixel with reference to the second color observation gray value C2OG corresponding to the second color observation pixel and the third color observation gray value C3OG corresponding to the third color observation pixel.

[0195] In the driving method of the display device, the gray converter 165 can receive the input gray value TIG corresponding to the target pixel, and the light-emitting pixel counter 164 can receive the second color observation gray value C2OG and the third color observation gray value C3OG.

[0196] The light-emitting pixel counter 164 can determine and provide the second color light-emitting pixel number C2EN by counting the number of second color observation gray values C2OG exceeding a reference value, and determine and provide the third color light-emitting pixel number C3EN by counting the number of third color observation gray values C3OG exceeding the reference value. As described above, the pixels receiving gray values exceeding the reference value can be classified as light-emitting pixels (the pixels are in the light-emitting state). Therefore, in other words, the second color light-emitting pixel number is the number of second color observation pixels in the light-emitting state, and the third color light-emitting pixel number is the number of third color observation pixels in the light-emitting state. The gray corrector 16 converts the input gray value TIG based on whether the second color observation pixel and the third color observation pixel are in the light-emitting state.

[0197] For example, in Figure 17 the case shown, the light-emitting pixel counter 164 can determine the second color light-emitting pixel number C2EN as 0 and the third color light-emitting pixel number C3EN as 0. In Figure 18 the case shown, the light-emitting pixel counter 164 can determine the second color light-emitting pixel number C2EN as 1 and the third color light-emitting pixel number C3EN as 0. In Figure 19 the case shown, the light-emitting pixel counter 164 can determine the second color light-emitting pixel number C2EN as 0 and the third color light-emitting pixel number C3EN as 1. In Figure 20 the case shown, the light-emitting pixel counter 164 can determine the second color light-emitting pixel number C2EN as 1 and the third color light-emitting pixel number C3EN as 1. In Figure 21 the case shown, the light-emitting pixel counter 164 can determine the second color light-emitting pixel number C2EN as 4 and the third color light-emitting pixel number C3EN as 4.

[0198] The grayscale converter 165 may generate and provide a converted grayscale value TCG obtained by converting an input grayscale value TIG based on the number of second-color light-emitting pixels C2EN and the number of third-color light-emitting pixels C3EN. For example, the grayscale converter 165 may generate the converted grayscale value TCG by adding an offset value to the input grayscale value TIG.

[0199] For example, when the number of second-color light-emitting pixels C2EN is 0 and the number of third-color light-emitting pixels C3EN is 0, the grayscale converter 165 may generate the converted grayscale value TCG by adding the corresponding offset value among the monochromatic offset values to the input grayscale value TIG (see Figure 17 ).

[0200] In addition, when the number of second-color light-emitting pixels C2EN is greater than 0 and the number of third-color light-emitting pixels C3EN is 0, the grayscale converter 165 may generate the converted grayscale value TCG by adding the corresponding offset value among the double-color mixing offset values to the input grayscale value TIG (see Figure 18 ).

[0201] In addition, when the number of second-color light-emitting pixels C2EN is greater than 0, the number of third-color light-emitting pixels C3EN is greater than 0, and the number of second-color light-emitting pixels C2EN and the number of third-color light-emitting pixels C3EN are not equal to the number of second-color viewing pixels and the number of third-color viewing pixels, respectively, the grayscale converter 165 may generate the converted grayscale value TCG by adding the corresponding offset value among the triple-color mixing offset values to the input grayscale value TIG (see Figure 20 ).

[0202] In addition, when the number of second-color light-emitting pixels C2EN is equal to the number of second-color viewing pixels and the number of third-color light-emitting pixels C3EN is equal to the number of third-color viewing pixels, the grayscale converter 165 may determine the input grayscale value TIG as the converted grayscale value TCG. In other words, in this case, the offset value may be 0 (see Figure 21 ). Therefore, in all other cases, for example, when the number of second-color light-emitting pixels C2EN is not equal to the total number of second-color viewing pixels, or the number of third-color light-emitting pixels C3EN is not equal to the total number of third-color viewing pixels, the converted grayscale value TCG is not equal to the input grayscale value TIG. As described above, the input grayscale value TIG added with the offset value is determined as the converted grayscale value TCG.

[0203] The first monochromatic offset provider 1611 may provide a first monochromatic offset value. The first monochromatic offset value may be a monochromatic offset value of the first color and varies according to the input maximum luminance value DBVI.

[0204] The second monochromatic offset provider 1621 can provide a second monochromatic offset value. The second monochromatic offset value can be the monochromatic offset value of a second color and varies according to the input maximum brightness value DBVI.

[0205] The third monochromatic offset provider 1631 can provide a third monochromatic offset value. The third monochromatic offset value can be the monochromatic offset value of a third color and varies according to the input maximum brightness value DBVI.

[0206] The first dual color mixing offset provider 1612 can provide a first dual color mixing offset value. The first dual color mixing offset value can be the dual color mixing offset value for the mixing of the first color and the second color (e.g., yellow) or the mixing of the first color and the third color (e.g., magenta) with respect to the target pixel of the first color.

[0207] The second dual color mixing offset provider 1622 can provide a second dual color mixing offset value. The second dual color mixing offset value can be the dual color mixing offset value for the mixing of the second color and the first color (e.g., yellow) or the mixing of the second color and the third color (e.g., cyan) with respect to the target pixel of the second color.

[0208] The third dual color mixing offset provider 1632 can provide a third dual color mixing offset value. The third dual color mixing offset value can be the dual color mixing offset value for the mixing of the third color and the first color (e.g., magenta) or the mixing of the third color and the second color (e.g., cyan) with respect to the target pixel of the third color.

[0209] The first triple color mixing offset provider 1613 can provide a first triple color mixing offset value. The first triple color mixing offset value can be the triple color mixing offset value for the mixing of the first color, the second color, and the third color with respect to the target pixel of the first color.

[0210] The second triple color mixing offset provider 1623 can provide a second triple color mixing offset value. The second triple color mixing offset value can be the triple color mixing offset value for the mixing of the first color, the second color, and the third color with respect to the target pixel of the second color.

[0211] The third triple color mixing offset provider 1633 can provide a third triple color mixing offset value. The third triple color mixing offset value can be the triple color mixing offset value for the mixing of the first color, the second color, and the third color with respect to the target pixel of the third color.

[0212] Figures 28 to 30 It is a diagram showing a monochromatic offset provider according to an exemplary embodiment of the inventive concept.

[0213] In an exemplary embodiment of the inventive concept, the first monochromatic offset provider 1611 may include a first monochromatic reference offset provider 16111 and a first monochromatic total offset generator 16112. The same description may be substantially applied to the second monochromatic offset provider 1621 and the third monochromatic offset provider 1631, and thus, repeated descriptions will be omitted.

[0214] The first monochromatic reference offset provider 16111 may receive an input maximum luminance value DBVI and provide first monochromatic reference offset values RRO1, RRO2, RRO3, RRO4, RRO5, RRO6, RRO7, RRO8, and RRO9 corresponding to the input maximum luminance value DBVI.

[0215] As described above, when the number of second-color light-emitting pixels is equal to the number of second-color viewing pixels and the number of third-color light-emitting pixels is equal to the number of third-color viewing pixels, the gray-scale converter 165 may output a converted gray-scale value equal to the input gray-scale value. The relationship of the converted gray-scale value with respect to the input gray-scale value may follow the white gray-scale line RWL.

[0216] As described above, when the number of second-color light-emitting pixels is 0 and the number of third-color light-emitting pixels is 0, the gray-scale converter 165 may output a converted gray-scale value different from the input gray-scale value. In other words, the converted gray-scale value may be generated by adding a corresponding offset value among the first monochromatic offset values RSO0 to RSO255 to the input gray-scale value. The relationship of the converted gray-scale value with respect to the input gray-scale value may follow the first monochromatic gray-scale line RSL.

[0217] For example, when the input gray value is 1, the converted gray value can become 1 by adding the first monochromatic offset value RSO1, which is 0, to the input gray value. When the input gray value is 7, the converted gray value can become 24 by adding the first monochromatic offset value RSO7, which is 17, to the input gray value. When the input gray value is 11, the converted gray value can become 64 by adding the first single offset value RSO11, which is 53, to the input gray value. When the input gray value is 23, the converted gray value can become 70 by adding the first monochromatic offset value RSO23, which is 47, to the input gray value. When the input gray value is 35, the converted gray value can become 75 by adding the first monochromatic offset value RSO35, which is 40, to the input gray value. When the input gray value is 51, the converted gray value can become 83 by adding the first monochromatic offset value RSO51, which is 32, to the input gray value. When the input gray value is 87, the converted gray value can become 107 by adding the first monochromatic offset value RSO87, which is 20, to the input gray value. When the input gray value is 151, the converted gray value can become 156 by adding the first monochromatic offset value RSO151, which is 5, to the input gray value. When the input gray value is 203, the converted gray value can become 206 by adding the first monochromatic offset value RSO203, which is 3, to the input gray value. When the input gray value is 255, the converted gray value can be 255. When the input gray value is 0, the converted gray value can be 0.

[0218] The first monochromatic offset values RSO1, RSO7, RSO11, RSO23, RSO35, RSO51, RSO87, RSO151, and RSO203 can correspond to the first monochromatic reference offset values RRO1, RRO2, RRO3, RRO4, RRO5, RRO6, RRO7, RRO8, and RRO9.

[0219] The first monochromatic total offset generator 16112 can generate the first monochromatic offset values RSO1 to RSO255 by interpolating the first monochromatic reference offset values RRO1 to RRO9. The interpolation method can use conventional methods such as linear interpolation, polynomial interpolation, or exponential interpolation.

[0220] For example, referring to Figure 29 and Figure 30 , the first monochromatic total offset generator 16112 can generate the first monochromatic offset value RSO8 corresponding to gray level 8, the first monochromatic offset value RSO9 corresponding to gray level 9, and the first monochromatic offset value RSO10 corresponding to gray level 10 by interpolating the first reference offset value RRO2 corresponding to gray level 7 and the first reference offset value RRO3 corresponding to gray level 11.

[0221] Therefore, according to the present exemplary embodiment, it is not necessary to store all the first monochromatic offset values RSO0 to RSO255, and accordingly, the configuration cost of the storage device and the like can be reduced.

[0222] Figure 31 FIG. is a diagram showing a configuration of offset values according to an exemplary embodiment of the inventive concept.

[0223] Referring to Figure 31 , the offset value RSO may include a sign bit SBT, an offset integer bit OIBT, and an offset decimal bit ODBT.

[0224] The sign bit SBT may indicate whether the offset value RSO is positive or negative. For example, referring to Figure 11 , it may be necessary to reduce the gamma values of the first monochromatic light curve RWC and the second monochromatic light curve GWC, and accordingly, the offset value RSO may be positive. On the other hand, it may be necessary to increase the gamma value of the third monochromatic light curve BWC, and accordingly, the offset value RSO may be negative. For example, the offset value RSO may indicate a positive number when the sign bit SBT is 0, and a negative number when the sign bit SBT is 1. Conversely, the offset value RSO may indicate a positive number when the sign bit SBT is 1, and a negative number when the sign bit SBT is 0.

[0225] As in the case shown in Figure 30 , the interpolated and converted gray values 24, 44, 54, and 64 may be represented only by integers, but in some cases, the interpolated and converted gray values must be represented by integers and decimals. For example, referring to Figure 29 , when correcting 63 input gray values corresponding between 87 and 151 to converted gray values between 107 and 156, the corrected converted gray values may be represented by integers and decimals. Since the integer between 107 and 156 is 48, at least 15 converted gray values must be represented by integers and decimals. Therefore, the offset value RSO includes an offset integer bit OIBT and an offset decimal bit ODBT.

[0226] When the offset value RSO has a decimal value, the corrected converted gray value cannot represent the corresponding luminance using only one of the gray voltages RV0 to RV255 (see Figure 8 ). The display panel 10 spatially dithers the target pixel and adjacent pixels to exhibit a luminance corresponding to the converted gray value having a decimal value.

[0227] Figure 32 FIG. is a diagram showing an effect obtained by applying a monochromatic offset value according to an exemplary embodiment of the inventive concept.

[0228] The first monochromatic light curve RWC represents the luminance when a pixel emits the first monochromatic light according to the input gray value.

[0229] The first monochromatic light correction curve RSC represents the luminance when a pixel emits the first monochromatic light according to the converted gray value obtained by correcting the input gray value.

[0230] For example, according to an exemplary embodiment of the inventive concept, the display panel 10 may include a first pixel that emits light of a first color, a second pixel that emits light of a second color different from the first color, and a third pixel that emits light of a third color different from the first color and the second color.

[0231] The first luminance of the first pixel in the first case where the first pixel, the second pixel, and the third pixel emit light may be different from the second luminance of the first pixel in the second case where only the first pixel emits light and the second pixel and the third pixel do not emit light.

[0232] The input gray values provided corresponding to the first pixel in the first case and the second case may be equal to each other.

[0233] In other words, the first luminance with respect to the input gray value in the first case may follow the first monochromatic light curve RWC, and the second luminance with respect to the input gray value in the second case may follow the first monochromatic light correction curve RSC.

[0234] The gamma value of the first monochromatic light correction curve RSC may be less than the gamma value of the first monochromatic light curve RWC. Accordingly, the luminance of the first monochromatic light can be accurately represented according to a desired gamma curve. In addition, the low gray performance can be further clarified.

[0235] The above exemplary embodiment can be basically applied to the second monochromatic light and the third monochromatic light, and thus, the repeated description will be omitted.

[0236] Figure 33 and Figure 34 is a diagram showing a monochromatic offset provider according to an exemplary embodiment of the inventive concept.

[0237] In an exemplary embodiment of the inventive concept, the first monochromatic reference offset provider 16111 may include a first monochromatic preset determiner 161111 and a first monochromatic reference offset generator 161112.

[0238] The first monochromatic preset determiner 161111 may pre-store a first preset offset value corresponding to a preset maximum luminance value, and determine whether the input maximum luminance value DBVI corresponds to any of the preset maximum luminance values.

[0239] For example, the preset maximum luminance values may include a maximum value (e.g., 1200 nits) and a minimum value (e.g., 4 nits) of the receivable input maximum luminance value DBVI.

[0240] Additionally, the preset maximum brightness value may further include a first intermediate maximum brightness value (e.g., 100 nits). When the input maximum brightness value is a value between the maximum value and the first intermediate maximum brightness value, the gray-scale voltage corresponding to the converted gray-scale value is adjusted corresponding to the input maximum brightness value DBVI, whereby the brightness of the target pixel can be controlled. For example, the brightness of the target pixel in the portion between 1200 nits and 100 nits may depend on the gray-scale voltage control method. Additionally, when the input maximum brightness value DBVI is a value between the minimum value and the first intermediate maximum brightness value, the emission period of the target pixel is adjusted corresponding to the input maximum brightness value DBVI, whereby the brightness of the target pixel can be controlled. For example, the brightness of the target pixel in the portion between 100 nits and 4 nits may depend on the duty ratio control method.

[0241] Additionally, the preset maximum brightness value may further include a second intermediate maximum brightness value (e.g., 30 nits) that is a value between the first intermediate maximum brightness value and the minimum value.

[0242] The above four preset maximum brightness values (e.g., 1200 nits, 100 nits, 30 nits, and 4 nits) are only examples, and other preset maximum brightness values may be set according to the product.

[0243] When the input maximum brightness value DBVI corresponds to any one of the preset maximum brightness values, the first monochromatic preset determiner 161111 may provide the corresponding first preset offset value DBVP1 as the first monochromatic reference offset values RRO1 to RRO9. For example, the first preset offset values DBVP1 for 1200 nits, 100 nits, 30 nits, and 4 nits may be stored in advance. Therefore, when the input maximum brightness value DBVI corresponds to one of 1200 nits, 100 nits, 30 nits, and 4 nits, the first monochromatic reference offset values RRO1 to RRO9 can be provided without passing through the first monochromatic reference offset generator 161112.

[0244] When the input maximum brightness value DBVI does not correspond to any one of the preset maximum brightness values, the first monochromatic preset determiner 161111 may provide the first preset offset values corresponding to at least two preset maximum brightness values.

[0245] For example, when the input maximum brightness value DBVI is 17 nits, the first monochromatic preset determiner 161111 may provide the first preset offset value DBVP1 corresponding to 4 nits and the second preset offset value DBVP2 corresponding to 30 nits.

[0246] The first single-color reference offset generator 161112 can generate first single-color reference offset values RRO1 to RRO9 by interpolating a first preset offset value DBVP1 and a second preset offset value DBVP2 corresponding to at least two preset maximum luminance values.

[0247] Refer to Figure 34 , and a process of determining the magnitude of a first reference offset value DBVG corresponding to 17 nits by interpolating a first preset offset value DBVP1 corresponding to 4 nits and a second preset offset value DBVP2 corresponding to 30 nits is represented by a graph.

[0248] Therefore, according to this exemplary embodiment, it is not necessary to store all offset values with respect to the receivable input maximum luminance value DBVI, and accordingly, the configuration cost of the storage device and the like can be reduced.

[0249] Figures 35 to 38 FIG. is a diagram showing a first dual-color mixing offset provider and a first triple-color mixing offset provider according to an exemplary embodiment of the inventive concept.

[0250] Refer to Figure 35 , the first dual-color mixing offset provider 1612 may include first dual-color mixing offset sub-units 1612X1, 1612X2, 1612X3, 1612X4, 1612Y1, 1612Y2, 1612Y3, and 1612Y4.

[0251] The first X2 dual-color mixing offset sub-unit 1612X2 can provide first X2 dual-color mixing offset values RX20 to RX2255 corresponding to when the number of light-emitting pixels of the second color is 2 and the number of light-emitting pixels of the third color is 0 with respect to the target pixel of the first color.

[0252] The first X4 dual-color mixing offset sub-unit 1612X4 can provide first X4 dual-color mixing offset values RX40 to RX4255 corresponding to when the number of light-emitting pixels of the second color is 4 and the number of light-emitting pixels of the third color is 0 with respect to the target pixel of the first color.

[0253] The first Y2 dual-color mixing offset sub-unit 1612Y2 can provide first Y2 dual-color mixing offset values RY20 to RY2255 corresponding to when the number of light-emitting pixels of the second color is 0 and the number of light-emitting pixels of the third color is 2 with respect to the target pixel of the first color.

[0254] The first Y4 dual-color mixing offset sub-unit 1612Y4 can provide first Y4 dual-color mixing offset values RY40 to RY4255 corresponding to when the number of light-emitting pixels of the second color is 0 and the number of light-emitting pixels of the third color is 4 with respect to the target pixel of the first color.

[0255] Refer to Figure 36, the first X4 dual-color mixing offset subunit 1612X4 may include a first X4 dual-color mixing reference offset provider 16121X4 and a first X4 dual-color mixing total offset generator 16122X4.

[0256] The first X4 dual-color mixing reference offset provider 16121X4 may provide first X4 dual-color mixing reference offset values RX4R0 to RX4R255 corresponding to the input maximum brightness value DBVI.

[0257] The first X4 dual-color mixing total offset generator 16122X4 may generate first X4 dual-color mixing offset values RX40 to RX4255 by interpolating the first X4 dual-color mixing reference offset values RX4R1 to RX4R9.

[0258] The configuration and operation of the first X4 dual-color mixing offset subunit 1612X4 are substantially the same as those of the first monochromatic offset provider 1611 shown in Figure 28 , and thus, the repeated description will be omitted. Similarly, the first X2 dual-color mixing offset subunit 1612X2, the first Y2 dual-color mixing offset subunit 1612Y2, and the first Y4 dual-color mixing offset subunit 1612Y4 may be configured similarly, and thus, the repeated description will be omitted.

[0259] The first X1 dual-color mixing offset subunit 1612X1 may provide first X1 dual-color mixing offset values RX10 to RX1255 corresponding to when the number of light-emitting pixels of the second color is 1 and the number of light-emitting pixels of the third color is 0 with respect to the target pixel of the first color.

[0260] For example, the first X1 dual-color mixing offset subunit 1612X1 may generate first X1 dual-color mixing offset values RX10 to RX1255 by interpolating the first monochromatic offset values RSO0 to RSO255 and the first X2 dual-color mixing offset values RX20 to RX2255.

[0261] Additionally, for example, the first X1 dual-color mixing offset subunit 1612X1 may output the first X2 dual-color mixing offset values RX20 to RX2255 as the first X1 dual-color mixing offset values RX10 to RX1255.

[0262] The first X3 dual-color mixing offset subunit 1612X3 may provide first X3 dual-color mixing offset values RX30 to RX3255 corresponding to when the number of light-emitting pixels of the second color is 3 and the number of light-emitting pixels of the third color is 0 with respect to the target pixel of the first color.

[0263] For example, the first X3 dual-color mixing offset subunit 1612X3 can generate first X3 dual-color mixing offset values RX30 to RX3255 by interpolating first X2 dual-color mixing offset values RX20 to RX2255 and first X4 dual-color mixing offset values RX40 to RX4255.

[0264] The first Y1 dual-color mixing offset subunit 1612Y1 can provide first Y1 dual-color mixing offset values RY10 to RY1255 corresponding to when the number of light-emitting pixels of the second color is 0 and the number of light-emitting pixels of the third color is 1 with respect to the target pixel of the first color.

[0265] For example, the first Y1 dual-color mixing offset subunit 1612Y1 can generate first Y1 dual-color mixing offset values RY10 to RY1255 by interpolating first single-color offset values RSO0 to RSO255 and first Y2 dual-color mixing offset values RY20 to RY2255.

[0266] In addition, for example, the first Y1 dual-color mixing offset subunit 1612Y1 can output first Y2 dual-color mixing offset values RY20 to RY2255 as first Y1 dual-color mixing offset values RY10 to RY1255.

[0267] The first Y3 dual-color mixing offset subunit 1612Y3 can provide first Y3 dual-color mixing offset values RY30 to RY3255 corresponding to when the number of light-emitting pixels of the second color is 0 and the number of light-emitting pixels of the third color is 3 with respect to the target pixel of the first color.

[0268] For example, the first Y3 dual-color mixing offset subunit 1612Y3 can provide first Y3 dual-color mixing offset values RY30 to RY3255 by interpolating first Y2 dual-color mixing offset values RY20 to RY2255 and first Y4 dual-color mixing offset values RY40 to RY4255.

[0269] According to this exemplary embodiment, when the unit area ORA displays dual-color mixing (e.g., magenta and yellow), the light curve of the dual-color mixing can be adjusted to become similar to the white light curve.

[0270] Referring to Figure 37 , the first triple-color mixing offset provider 1613 can include first triple-color mixing offset subunits 1613X1Y1, 1613X1Y2, 1613X1Y3, 1613X1Y4, 1613X2Y1, 1613X2Y2, 1613X2Y3, 1613X2Y4, 1613X3Y1, 1613X3Y2, 1613X3Y3, 1613X3Y4, 1613X4Y1, 1613X4Y2, and 1613X4Y3.

[0271] The first X1Y1 triple-color mixing offset subunit 1613X1Y1 can provide, with respect to the target pixel of the first color, the first X1Y1 triple-color mixing offset values RX1Y10 to RX1Y1255 corresponding to the case where the number of light-emitting pixels of the second color is 1 and the number of light-emitting pixels of the third color is 1.

[0272] For example, the first X1Y1 triple-color mixing offset subunit 1613X1Y1 can generate the first X1Y1 triple-color mixing offset values RX1Y10 to RX1Y1255 by using the double-color mixing offset values corresponding to the sum of the number of light-emitting pixels (here 2).

[0273] For example, the first X1Y1 triple-color mixing offset subunit 1613X1Y1 can generate the first X1Y1 triple-color mixing offset values RX1Y10 to RX1Y1255 by using the first X2 double-color mixing offset values RX20 to RX2255 and the first Y2 double-color mixing offset values RY20 to RY2255.

[0274] For example, the first X1Y1 triple-color mixing offset values RX1Y10 to RX1Y1255 can be determined using the following mathematical formula 2.

[0275] Mathematical formula 2

[0276]

[0277] Here, RX1Y1 can be the first X1Y1 triple-color mixing offset value corresponding to the input grayscale value, W_RX1Y1 can be the weighting value, X_RX1Y1 can be 1 as the number of light-emitting pixels of the second color, Y_RX1Y1 can be 1 as the number of light-emitting pixels of the third color, RX2 can be the first X2 double-color mixing offset value corresponding to the input grayscale value, and RY2 can be the first Y2 double-color mixing offset value corresponding to the input grayscale value. The weighting value W_RX1Y1 can increase as the input grayscale value increases. The weighting value W_RX1Y1 can be a real number that is 0 or greater and 1 or less. The weighting value W_RX1Y1 can vary according to the input maximum luminance value DBVI.

[0278] The first X1Y2 triple-color mixing offset subunit 1613X1Y2 can provide, with respect to the target pixel of the first color, the first X1Y2 triple-color mixing offset values RX1Y20 to RX1Y2255 corresponding to the case where the number of light-emitting pixels of the second color is 1 and the number of light-emitting pixels of the third color is 2.

[0279] For example, the first X1Y2 triple-color mixing offset subunit 1613X1Y2 can generate the first X1Y2 triple-color mixing offset values RX1Y20 to RX1Y2255 by using the double-color mixing offset values corresponding to the sum of the number of light-emitting pixels (here 3).

[0280] For example, the first X1Y2 triple color mixing offset subunit 1613X1Y2 can generate the first X1Y2 triple color mixing offset values RX1Y20 to RX1Y2255 by using the first X3 double color mixing offset values RX30 to RX3255 and the first Y3 double color mixing offset values RY30 to RY3255.

[0281] For example, the first X1Y2 triple color mixing offset values RX1Y20 to RX1Y2255 can be determined using the following Mathematical Formula 3.

[0282] Mathematical Formula 3

[0283]

[0284] Here, RX1Y2 can be the first X1Y2 triple color mixing offset value corresponding to the input grayscale value, W_RX1Y2 can be the weighting value, X_RX1Y2 can be 1 as the number of second color light emitting pixels, Y_RX1Y2 can be 2 as the number of third color light emitting pixels, RX3 can be the first X3 double color mixing offset value corresponding to the input grayscale value, and RY3 can be the first Y3 double color mixing offset value corresponding to the input grayscale value. The weighting value W_RX1Y2 can increase as the input grayscale value increases. The weighting value W_RX1Y2 can be a real number that is 0 or greater and 1 or less. The weighting value W_RX1Y2 can vary according to the input maximum luminance value DBVI.

[0285] The first X2Y1 triple color mixing offset subunit 1613X2Y1 can provide the first X2Y1 triple color mixing offset values RX2Y10 to RX2Y1255 corresponding to when the number of second color light emitting pixels is 2 and the number of third color light emitting pixels is 1 with respect to the target pixel of the first color. For example, the first X2Y1 triple color mixing offset subunit 1613X2Y1 can generate the first X2Y1 triple color mixing offset values RX2Y10 to RX2Y1255 by using the first X3 double color mixing offset values RX30 to RX3255 and the first Y3 double color mixing offset values RY30 to RY3255. Therefore, its repeated description will be omitted.

[0286] The first X3Y1 triple color mixing offset subunit 1613X3Y1 can provide the first X3Y1 triple color mixing offset values RX3Y10 to RX3Y1255 corresponding to when the number of second color light emitting pixels is 3 and the number of third color light emitting pixels is 1 with respect to the target pixel of the first color. For example, the first X3Y1 triple color mixing offset subunit 1613X3Y1 can generate the first X3Y1 triple color mixing offset values RX3Y10 to RX3Y1255 by using the first X4 double color mixing offset values RX40 to RX4255 and the first Y4 double color mixing offset values RY40 to RY4255. Therefore, its repeated description will be omitted.

[0287] The first X2Y2 triple-color mixing offset subunit 1613X2Y2 can provide, with respect to the target pixel of the first color, first X2Y2 triple-color mixing offset values RX2Y20 to RX2Y2255 corresponding to the case where the number of light-emitting pixels of the second color is 2 and the number of light-emitting pixels of the third color is 2. For example, the first X2Y2 triple-color mixing offset subunit 1613X2Y2 can generate the first X2Y2 triple-color mixing offset values RX2Y20 to RX2Y2255 by using the first X4 double-color mixing offset values RX40 to RX4255 and the first Y4 double-color mixing offset values RY40 to RY4255. Therefore, its repeated description will be omitted.

[0288] The first X1Y3 triple-color mixing offset subunit 1613X1Y3 can provide, with respect to the target pixel of the first color, first X1Y3 triple-color mixing offset values RX1Y30 to RX1Y3255 corresponding to the case where the number of light-emitting pixels of the second color is 1 and the number of light-emitting pixels of the third color is 3. For example, the first X1Y3 triple-color mixing offset subunit 1613X1Y3 can generate the first X1Y3 triple-color mixing offset values RX1Y30 to RX1Y3255 by using the first X4 double-color mixing offset values RX40 to RX4255 and the first Y4 double-color mixing offset values RY40 to RY4255. Therefore, its repeated description will be omitted.

[0289] The first X3Y3 triple-color mixing offset subunit 1613X3Y3 can provide, with respect to the target pixel of the first color, first X3Y3 triple-color mixing offset values RX3Y30 to RX3Y3255 corresponding to the case where the number of light-emitting pixels of the second color is 3 and the number of light-emitting pixels of the third color is 3. For example, the first X3Y3 triple-color mixing offset values RX3Y30 to RX3Y3255 can be determined using the following mathematical formula 4.

[0290] Mathematical formula 4

[0291]

[0292] Here, RX3Y3 can be the first X3Y3 triple-color mixing offset value corresponding to the input gray value, W_RX3Y3 can be the weighting value, RX4Y4 can be the white offset value corresponding to the input gray value, and RX2Y2 can be the first X2Y2 triple-color mixing offset value corresponding to the input gray value. The weighting value W_RX3Y3 can increase as the input gray value increases. The weighting value W_RX3Y3 can be a real number that is 0 or greater and 1 or less. The weighting value W_RX3Y3 can vary according to the input maximum brightness value DBVI. RX4Y4 can be 0.

[0293] The first X3Y2 triple-color mixing offset subunit 1613X3Y2 can provide the first X3Y2 triple-color mixing offset values RX3Y20 to RX3Y2255 corresponding to the case where the number of light-emitting pixels of the second color is 3 and the number of light-emitting pixels of the third color is 2 with respect to the target pixel of the first color. For example, the first X3Y2 triple-color mixing offset values RX3Y20 to RX3Y2255 can be determined using the following mathematical formula 5.

[0294] Mathematical formula 5

[0295]

[0296] Here, RX3Y2 can be the first X3Y2 triple-color mixing offset value corresponding to the input grayscale value, RX3Y3 can be the first X3Y3 triple-color mixing offset value corresponding to the input grayscale value, and RX3Y1 can be the first X3Y1 triple-color mixing offset value corresponding to the input grayscale value.

[0297] The first X2Y3 triple-color mixing offset subunit 1613X2Y3 can provide the first X2Y3 triple-color mixing offset values RX2Y30 to RX2Y3255 corresponding to the case where the number of light-emitting pixels of the second color is 2 and the number of light-emitting pixels of the third color is 3 with respect to the target pixel of the first color. For example, the first X2Y3 triple-color mixing offset values RX2Y30 to RX2Y3255 can be determined using the following mathematical formula 6.

[0298] Mathematical formula 6

[0299]

[0300] Here, RX2Y3 can be the first X2Y3 triple-color mixing offset value corresponding to the input grayscale value, RX3Y3 can be the first X3Y3 triple-color mixing offset value corresponding to the input grayscale value, and RX1Y3 can be the first X1Y3 triple-color mixing offset value corresponding to the input grayscale value.

[0301] The first X4Y3 triple-color mixing offset subunit 1613X4Y3 can provide the first X4Y3 triple-color mixing offset values RX4Y30 to RX4Y3255 corresponding to the case where the number of light-emitting pixels of the second color is 4 and the number of light-emitting pixels of the third color is 3 with respect to the target pixel of the first color. For example, the first X4Y3 triple-color mixing offset values RX4Y30 to RX4Y3255 can be determined using the following mathematical formula 7.

[0302] Mathematical formula 7

[0303] RX4Y3 = RX3Y3 + (RX3Y3 - RX2Y3)

[0304] Here, RX4Y3 can be the first X4Y3 triple color mixing offset value corresponding to the input gray value, RX3Y3 can be the first X3Y3 triple color mixing offset value corresponding to the input gray value, and RX2Y3 can be the first X2Y3 triple color mixing offset value corresponding to the input gray value.

[0305] The first X3Y4 triple color mixing offset sub-unit 1613X3Y4 can provide the first X3Y4 triple color mixing offset values RX3Y40 to RX3Y4255 corresponding to when the number of light-emitting pixels of the second color is 3 and the number of light-emitting pixels of the third color is 4 with respect to the target pixel of the first color. For example, the first X3Y4 triple color mixing offset values RX3Y40 to RX3Y4255 can be determined using the following mathematical formula 8.

[0306] Mathematical formula 8

[0307] RX3Y4 = RX3Y3 + (RX3Y3 - RX3Y2)

[0308] Here, RX3Y4 can be the first X3Y4 triple color mixing offset value corresponding to the input gray value, RX3Y3 can be the first X3Y3 triple color mixing offset value corresponding to the input gray value, and RX3Y2 can be the first X3Y2 triple color mixing offset value corresponding to the input gray value.

[0309] The first X2Y4 triple color mixing offset sub-unit 1613X2Y4 can provide the first X2Y4 triple color mixing offset values RX2Y40 to RX2Y4255 corresponding to when the number of light-emitting pixels of the second color is 2 and the number of light-emitting pixels of the third color is 4 with respect to the target pixel of the first color. For example, the first X2Y4 triple color mixing offset values RX2Y40 to RX2Y4255 can be determined using the following mathematical formula 9.

[0310] Mathematical formula 9

[0311] RX2Y4 = RX3Y4 + (RX3Y4 - RX4Y4)

[0312] Here, RX2Y4 can be the first X2Y4 triple color mixing offset value corresponding to the input gray value, RX3Y4 can be the first X3Y4 triple color mixing offset value corresponding to the input gray value, and RX4Y4 can be the white offset value corresponding to the input gray value. RX4Y4 can be 0.

[0313] The first X4Y2 triple color mixing offset sub-unit 1613X4Y2 can provide the first X4Y2 triple color mixing offset values RX4Y20 to RX4Y2255 corresponding to when the number of light-emitting pixels of the second color is 4 and the number of light-emitting pixels of the third color is 2 with respect to the target pixel of the first color. For example, the first X4Y2 triple color mixing offset values RX4Y20 to RX4Y2255 can be determined using the following mathematical formula 10.

[0314] Mathematical formula 10

[0315] RX4Y2 = RX4Y3 + (RX4Y3 - RX4Y4)

[0316] Here, RX4Y2 can be the first X4Y2 triple color mixing offset value corresponding to the input gray value, RX4Y3 can be the first X4Y3 triple color mixing offset value corresponding to the input gray value, and RX4Y4 can be the first X4Y4 triple color mixing offset value corresponding to the input gray value.

[0317] The first X1Y4 triple color mixing offset sub - unit 1613X1Y4 can provide the first X1Y4 triple color mixing offset values RX1Y40 to RX1Y4255 corresponding to the case where the number of light - emitting pixels of the second color is 1 and the number of light - emitting pixels of the third color is 4 with respect to the target pixel of the first color. For example, the first X1Y4 triple color mixing offset values RX1Y40 to RX1Y4255 can be determined using the following Mathematical formula 11.

[0318] Mathematical formula 11

[0319] RX1Y4 = RX2Y4 + (RX2Y4 - RX3Y4)

[0320] Here, RX1Y4 can be the first X1Y4 triple color mixing offset value corresponding to the input gray value, RX2Y4 can be the first X2Y4 triple color mixing offset value corresponding to the input gray value, and RX3Y4 can be the first X3Y4 triple color mixing offset value corresponding to the input gray value.

[0321] The first X4Y1 triple color mixing offset sub - unit 1613X4Y1 can provide the first X4Y1 triple color mixing offset values RX4Y10 to RX4Y1255 corresponding to the case where the number of light - emitting pixels of the second color is 4 and the number of light - emitting pixels of the third color is 1 with respect to the target pixel of the first color. For example, the first X4Y1 triple color mixing offset values RX4Y10 to RX4Y1255 can be determined using the following Mathematical formula 12.

[0322] Mathematical formula 12

[0323] RX4Y1 = RX4Y2 + (RX4Y2 - RX4Y3)

[0324] Here, RX4Y1 can be the first X4Y1 triple color mixing offset value corresponding to the input gray value, RX4Y2 can be the first X4Y2 triple color mixing offset value corresponding to the input gray value, and RX4Y3 can be the first X4Y3 triple color mixing offset value corresponding to the input gray value.

[0325] Figure 38shows the relationship between the dual-color mixing offset values and the triple-color mixing offset values organized with respect to the target pixels of the first color. According to Figures 35 to 37 In the exemplary embodiment shown in

[0326] Figures 39 to 42 is a diagram showing a second dual-color mixing offset provider and a second triple-color mixing offset provider according to an exemplary embodiment of the inventive concept.

[0327] Referring to Figure 39 , the second dual-color mixing offset provider 1622 may include second dual-color mixing offset sub-units 1622X1, 1622X2, 1622Y1, and 1622Y2.

[0328] The second X1 dual-color mixing offset sub-unit 1622X1 may provide second X1 dual-color mixing offset values GX10 to GX1255 corresponding to when the number of light-emitting pixels of the first color is 1 and the number of light-emitting pixels of the third color is 0 with respect to the target pixels of the second color.

[0329] The second X2 dual-color mixing offset sub-unit 1622X2 may provide second X2 dual-color mixing offset values GX20 to GX2255 corresponding to when the number of light-emitting pixels of the first color is 2 and the number of light-emitting pixels of the third color is 0 with respect to the target pixels of the second color.

[0330] The second Y1 dual-color mixing offset sub-unit 1622Y1 may provide second Y1 dual-color mixing offset values GY10 to GY1255 corresponding to when the number of light-emitting pixels of the first color is 0 and the number of light-emitting pixels of the third color is 1 with respect to the target pixels of the second color.

[0331] The second Y2 dual-color mixing offset sub-unit 1622Y2 may provide second Y2 dual-color mixing offset values GY20 to GY2255 corresponding to when the number of light-emitting pixels of the first color is 0 and the number of light-emitting pixels of the third color is 2 with respect to the target pixels of the second color.

[0332] Referring to Figure 40 , the second X2 dual-color mixing offset sub-unit 1622X2 may include a second X2 dual-color mixing reference offset provider 16221X2 and a second X2 dual-color mixing total offset generator 16222X2.

[0333] The second X2 dual-color mixing reference offset provider 16221X2 can provide second X2 dual-color mixing reference offset values GX2R1 to GX2R9 corresponding to the input maximum luminance value DBVI.

[0334] The second X2 dual-color mixing total offset generator 16222X2 can generate second X2 dual-color mixing offset values GX20 to GX2255 by interpolating the second X2 dual-color mixing reference offset values GX2R1 to GX2R9.

[0335] The configuration and operation of the second X2 dual-color mixing offset subunit 1622X2 are substantially the same as those of the first monochromatic offset provider 1611 shown in Figure 28 and thus, the repeated description will be omitted. Similarly, the second X1 dual-color mixing offset subunit 1622X1, the second Y1 dual-color mixing offset subunit 1622Y1, and the second Y2 dual-color mixing offset subunit 1622Y2 can be configured similarly and thus, the repeated description will be omitted.

[0336] Referring to Figure 41 , the second triple-color mixing offset provider 1623 can include second triple-color mixing offset subunits 1623X1Y1, 1623X1Y2, and 1623X2Y1.

[0337] The second X1Y1 triple-color mixing offset subunit 1623X1Y1 can provide second X1Y1 triple-color mixing offset values GX1Y10 to GX1Y1255 corresponding to when the number of light-emitting pixels of the first color is 1 and the number of light-emitting pixels of the third color is 1 with respect to the target pixel of the second color. For example, the second X1Y1 triple-color mixing offset values GX1Y10 to GX1Y1255 can be determined using the following mathematical formula 13.

[0338] Mathematical formula 13

[0339]

[0340] Here, GX1Y1 can be the second X1Y1 triple-color mixing offset value corresponding to the input gray value, W_GX1Y1 can be the weighting value, GSO can be the second monochromatic offset value corresponding to the input gray value, and GX2Y2 can be the white offset value corresponding to the input gray value. The weighting value W_GX1Y1 can increase as the input gray value increases. The weighting value W_GX1Y1 can be a real number that is 0 or greater and 1 or less. The weighting value W_GX1Y1 can vary according to the input maximum luminance value DBVI. GX2Y2 can be 0.

[0341] The second X1Y2 triple-color mixing offset subunit 1623X1Y2 can provide second X1Y2 triple-color mixing offset values GX1Y20 to GX1Y2255 corresponding to the case where the number of light-emitting pixels of the first color is 1 and the number of light-emitting pixels of the third color is 2 with respect to the target pixel of the second color. For example, the second X1Y2 triple-color mixing offset values GX1Y20 to GX1Y2255 can be determined using the following mathematical formula 14.

[0342] Mathematical formula 14

[0343]

[0344] Here, GX1Y2 can be the second X1Y2 triple-color mixing offset value corresponding to the input gray value, W_GX1Y2 can be the weighting value, GY2 can be the second Y2 double-color mixing offset value corresponding to the input gray value, and GX2Y2 can be the white offset value corresponding to the input gray value. The weighting value W_GX1Y2 can increase as the input gray value increases. The weighting value W_GX1Y2 can be a real number that is 0 or greater and 1 or less. The weighting value W_GX1Y2 can vary according to the input maximum luminance value DBVI. GX2Y2 can be 0.

[0345] The second X2Y1 triple-color mixing offset subunit 1623X2Y1 can provide second X2Y1 triple-color mixing offset values GX2Y10 to GX2Y1255 corresponding to the case where the number of light-emitting pixels of the first color is 2 and the number of light-emitting pixels of the third color is 1 with respect to the target pixel of the second color. For example, the second X2Y1 triple-color mixing offset values GX2Y10 to GX2Y1255 can be determined using the following mathematical formula 15.

[0346] Mathematical formula 15

[0347]

[0348] Here, GX2Y1 can be the second X2Y1 triple-color mixing offset value corresponding to the input gray value, W_GX2Y1 can be the weighting value, GX2 can be the second X2 double-color mixing offset value corresponding to the input gray value, and GX2Y2 can be the white offset value corresponding to the input gray value. The weighting value W_GX2Y1 can increase as the input gray value increases. The weighting value W_GX2Y1 can be a real number that is 0 or greater and 1 or less. The weighting value W_GX2Y1 can vary according to the input maximum luminance value DBVI. GX2Y2 can be 0.

[0349] Figure 42 Shows the relationship between the double-color mixing offset value and the triple-color mixing offset value organized with respect to the target pixel of the second color. According to Figures 39 to 41In the exemplary embodiments shown, the storage device is used only when generating the second monochromatic offset values GSO0 to GSO255 and the second double color mixing offset values GX10 to GX1255, GX20 to GX2255, GY10 to GY1255, and GY20 to GY2255, and the second triple color mixing offset values GX1Y10 to GX1Y1255, GX2Y10 to GX2Y1255, GX1Y20 to GX1Y2255, and GX2Y20 to GX2Y2255 are generated by calculation, whereby the configuration cost of the storage device can be reduced.

[0350] Figures 43 to 46 FIG. is a diagram showing a third double color mixing offset provider and a third triple color mixing offset provider according to an exemplary embodiment of the inventive concept.

[0351] Except for the pixel that emits light of the third color as the target pixel, the third double color mixing offset provider 1632 corresponds to Figure 35 the first double color mixing offset provider 1612 shown in, and the third triple color mixing offset provider 1633 corresponds to Figure 37 the third triple color mixing offset provider 1613 shown in. Accordingly, repetitive descriptions will be omitted.

[0352] In a display device and a driving method thereof according to an exemplary embodiment of the inventive concept, even when monochromatic light and mixed color light are emitted in addition to white light, the display device can present a desired luminance.

[0353] Although the inventive concept has been shown and described with reference to exemplary embodiments of the inventive concept, those of ordinary skill in the art will understand that various changes in form and detail can be made without departing from the scope and spirit of the inventive concept as recited in the appended claims.

Claims

1. A display device, comprising: a processor; and a display panel configured to receive an observed gray value from the processor, wherein the display panel includes: a data driver configured to apply a data voltage to a data line; a target pixel coupled to at least one of the data lines and configured to emit light of a first color; second color observation pixels, each second color observation pixel coupled to at least one of the data lines and configured to emit light of a second color different from the first color; and third color observation pixels, each third color observation pixel coupled to at least one of the data lines and configured to emit light of a third color different from the first color and the second color, wherein the target pixel is in a first direction from a first one of the second color observation pixels, a second one of the second color observation pixels is in the first direction from the target pixel, and no other pixel is between the target pixel and each second observation pixel of the second color observation pixels, wherein the target pixel is in a second direction from a first one of the third color observation pixels, a second one of the third color observation pixels is in the second direction from the target pixel, and no other pixel is between the target pixel and each third observation pixel of the third color observation pixels, wherein when the observed gray value of the second color observation pixel exceeds a first reference value or the observed gray value of the third color observation pixel exceeds a second reference value, the display panel applies a first data voltage to the target pixel, wherein when at least one of the observed gray values when the observed gray values of the second color observation pixel and the third color observation pixel do not exceed the first reference value and the second reference value respectively do not exceed the first reference value and the second reference value respectively, the display panel applies a second data voltage to the target pixel, and wherein the first data voltage and the second data voltage are different from each other.

2. The display device according to claim 1, Among them, the emission area of the target pixel is smaller than the emission area of each second color observation pixel of the second color observation pixels.

3. The display device according to claim 2, Among them, the emission area of the target pixel is smaller than the emission area of each third color observation pixel of the third color observation pixels.

4. The display device according to claim 3, Among them, the emission area of each second color observation pixel of the second color observation pixels is the same as the emission area of each third color observation pixel of the third color observation pixels.

5. The display device according to claim 1, Among them, the first one of the second color observation pixels and the first one of the third color observation pixels are connected to the same scan line, but are connected to different data lines.

6. The display device according to claim 5, Among them, The second one of the second color observation pixels and the second one of the third color observation pixels are connected to the same scan line, but are connected to different data lines.

7. The display device according to claim 6, Among them, The first one of the second color observation pixels and the second one of the third color observation pixels are connected to the same data line.

8. The display device according to claim 7, Among them, The first one of the third color observation pixels and the second one of the second color observation pixels are connected to the same data line.

9. The display device according to claim 8, Among them, The target pixel is connected to a scan line and a data line, and neither the scan line nor the data line is connected to any one of the second color observation pixel and the third color observation pixel.

10. The display device according to claim 1, Among them, The first direction and the second direction are perpendicular to each other.

11. A method for driving a display device, Among them, The display device includes: A target pixel configured to emit light of a first color; A second color observation pixel located near the target pixel and configured to emit light of a second color different from the first color; and A third color observation pixel located near the target pixel and configured to emit light of a third color different from the first color and the second color, wherein the driving method includes: Receiving an input gray value corresponding to the target pixel, a second color observation gray value corresponding to the second color observation pixel, and a third color observation gray value corresponding to the third color observation pixel; Determining the number of second color-emitting pixels by counting the number of the second color observation gray values exceeding a first reference value; Determining the number of third color-emitting pixels by counting the number of the third color observation gray values exceeding a second reference value; and Generating a converted gray value by converting the input gray value based on the number of the second color-emitting pixels and the number of the third color-emitting pixels.

12. The method according to claim 11, wherein When generating the converted gray value, when the number of the second color-emitting pixels is 0 and the number of the third color-emitting pixels is 0, generating the converted gray value by adding a single color offset value to the input gray value.

13. The method according to claim 12, wherein, When generating the converted gray value, when the number of the second color-emitting pixels is greater than 0 and the number of the third color-emitting pixels is 0, generating the converted gray value by adding a double mixed color offset value to the input gray value.

14. The method according to claim 13, wherein, When generating the converted gray value, when the number of the second color-emitting pixels is greater than 0, the number of the third color-emitting pixels is greater than 0, and the number of the second color-emitting pixels and the number of the third color light-emitting pixels are respectively not equal to the number of the second color observation pixels and the number of the third color observation pixels, generating the converted gray value by adding a triple mixed color offset value to the input gray value.

15. The method according to claim 14, wherein, When generating the converted gray value, when the number of the second-color light-emitting pixels is equal to the number of the second-color observing pixels and the number of the third-color light-emitting pixels is equal to the number of the third-color observing pixels, the input gray value is determined as the converted gray value.

Images