Abstract: An apparatus and a method for automatically controlling a screen brightness of an AVN system are provided to automatically change screen brightness in a user customized manner in a response to a change in illumination outside the vehicle. The apparatus include a screen brightness control module that controls such that a screen brightness of a display provided in the AVN system is automatically changed according to a change in the illumination data received from the illumination sensor, based on a default matching relationship between previously stored illumination data and screen brightness and a gain adjustment module that generates a new customized matching relationship by correcting the screen brightness matched to each illumination data based on the default matching relationship in accordance with an input of a user who adjusts to enhance or weaken the screen brightness and provides the screen brightness control module with the new customized matching relationship for screen brightness control.

Abstract: A display device is disclosed that includes a display panel, a controller, and a data driver. The controller is configured to determine first luminances with respect to a reference grayscale in a second frame when the reference grayscale is displayed in the second frame after the reference grayscale is displayed in a first frame. The controller is configured to determine second luminances with respect to the reference grayscale in the second frame when the reference grayscale is displayed in the second frame after a minimum grayscale is displayed in the first frame. The controller is further configured to temporally and spatially arrange first data corresponding to the reference grayscale and second data corresponding to the minimum grayscale to generate a data signal. And, the controller is configured to drive the display panel with a digital driving method in a first grayscale section, and drive the display panel with an analog driving method in a second grayscale section.

Abstract: A pixel circuit and a display panel are disclosed. The pixel circuit comprises a first transistor, a pulse amplitude driving module, and a pulse width driving module. The pixel circuit and the display panel utilize a pulse amplitude driving module to drive the first transistor when a middle to high gray value of a frame is being displayed such that the number of frequency divisions in a high gray value could be reduced. Furthermore, the pixel circuit and the display panel utilize a pulse width driving module to drive the first transistor when a middle to low gray value of the frame is being displayed to improve the light emitting efficiency and luminance evenness in a low gray value.

Abstract: A pixel circuit driving method of controlling an operation of a light-emitting element provided in a pixel of a display panel may comprise: applying pulse amplitude modulation (PAM) signals having a plurality of levels to a first terminal of a first transistor having a second terminal connected to a control terminal of a second transistor configured to drive the light-emitting element with a current according to a gray scale required for the light-emitting element; and applying a PAM signal of any one level selected from the PAM signals to the control terminal of the second transistor during each sub-frame time corresponding to a turn-on time of the first transistor controlled by a pulse width modulation (PWM) signal having a plurality of sub-frames in a single frame according to the gray scale.

Abstract: A display driver includes image processing circuitry and drive circuitry. The image processing circuitry is configured to generate first voltage data for a first pixel in a first screen area of a display panel using a first gamma parameter. The image processing circuitry is further configured to generate second voltage data for a second pixel in a second screen area of the display panel using a second gamma parameter set. The image processing circuitry is further configured to determine an interpolated gamma parameter set for a third pixel in a connection area of the display panel through interpolation between the first gamma parameter set and the second gamma parameter set. The connection area is disposed between the first screen area and the second screen area. The image processing circuitry is further configured to generate third voltage data for the third pixel using the interpolated gamma parameter set.

Abstract: An afterimage compensation device includes: an afterimage area detector to receive an input image, and detect an afterimage area including an afterimage in the input image; an afterimage area corrector to detect a false detection area, and generate a corrected afterimage area, the false detection area being a part of a general area that is not detected as the afterimage area and surrounded in a plurality of directions by the detected afterimage area; and a compensation data generator to adjust a luminance of the corrected afterimage area to generate compensation data.

Abstract: A display panel includes: a plurality of light emitting signal lines. Under a control of switching signals provided from a plurality of switching signal lines and control signals provided from a plurality of control signal lines, working gray scale level signals corresponding to respective display gray scales are written to corresponding sub-pixels in an order from small to large in working gray scale sequentially by a plurality of times in one frame display time through the plurality of light emitting signal lines. Different working gray scale level signals indicate have different durations, and each of the working gray scale level signals is provided to the organic light emitting diode via the second transistor through a light emitting signal line, and a final display gray scale is a gray scale caused by superimposing different working gray scale level signals.

Abstract: An electronic device is provided. The electronic device includes a driver, a driving circuit and an electronic element. The driver converts a first PWM data to a second PWM data according to a gamma setting curve, and converts a first PAM data to a second PAM data according to the gamma setting curve. The driving circuit includes a PWM circuit and a PAM circuit. The PWM circuit receives the second PWM data. The PAM circuit receives the second PAM data. The electronic element emits a light according to a driving current provided from the driving circuit.

Abstract: A noise reduction circuit for a matrix LED driver includes a pseudo random number generator, an up counter, a clock module, and a plurality of matrix switch controllers. The matrix switch controllers and the up counter randomly change a power-on sequence applied across matrix switches in the matrix LED driver according to working random numbers generated by the pseudo random number generator. The circuit prevents jitter-induced noise from periodically reoccurring at the power source of the matrix LED driver, thereby reducing noise energy.

Abstract: The present invention provides a dimming panel including: a drive circuit; and dimming units arranged in one direction from a drive circuit, the dimming panel sequentially including a first substrate, a liquid crystal layer, and a second substrate, the first substrate sequentially including an insulating substrate, connection lines formed from a transparent conductive material and connected to the drive circuit, a first insulating layer, a first electrode, a second insulating layer, and a second electrode, the first electrode or the second electrode including dimming electrodes disposed for the respective dimming units, each of the dimming electrodes being electrically connected to one of the connection lines, an electrode width of at least one of the connection lines increasing in response to a distance from the drive circuit.

Abstract: An apparatus includes a display screen, an ambient light sensor disposed behind the display screen, and an electronic control unit operable to control a brightness of the display screen based on a duty cycle of a PWM signal. The electronic control unit is operable to sample an output of the ambient light sensor, identify a pair of consecutive samples of the ambient light sensor output that represent a greatest difference in magnitudes of their values, and to estimate a brightness of the display screen based on the difference.

Abstract: An image data processing device includes a data acquisition module for acquiring image data including original data information of images, the original data information of each image including the luminance value of each pixel in the image, and the luminance range that the image data may represent being Lmin-Lmax; a data conversion module for receiving the image data and converting the original data information of each image into new data information; and a data output module for outputting the new data information of each image in the data conversion module together with the corresponding maximum relative luminance value ? thereof. A capturing equipment and a display system are also provided.

Abstract: A three-dimensional source device provides a three-dimensional display signal for a display via a high speed digital interface, such as HDMI. The three-dimensional display signal comprises a sequence of frames. The sequence of frames comprises units, each unit corresponding to frames comprising video information intended to be composited and displayed as a three-dimensional image. The three-dimensional source device includes three-dimensional transfer information comprising at least information about the video frames in the unit. The display detects the three-dimensional transfer information, and generates the display control signals based in dependence on the three-dimensional transfer information.

Abstract: An electronic device may have a display. A protective display cover layer for the display may tend to dim pixels near the edge of the display. Control circuitry in the electronic device may boost luminance for pixels in an edge region of a displayed image relative to a center region of the image. This ensures that image brightness does not vary across the image. The control circuitry may include a graphics processing unit, a pixel pipeline implemented in a system-on-chip circuit block, and a display drive circuit block. Luminance compensation may be implemented in the system-on-chip block and/or in the display driver circuit block.

Abstract: A display device includes: a display unit; a display driver configured to drive the display unit; and a display-data generator configured to transfer a screenful of update display data to the display driver. The display driver includes a light-emission controller configured to control self-luminous elements to emit light, and a memory storing a screenful of the update display data. After a lapse of a predetermined time period from a driving stop time, the display driver reads the update display data stored in the memory and then uses the update display data to drive a screen, the driving stop time being a time when the display unit is stopped from driving based on the update display data. The display driver causes the self-luminous elements of the display unit to emit light, even during a display update or no display update performed on the display driver by the display-data generator.

Abstract: A method for managing motion includes dividing a time allocated to display of an image into a first interval and a second interval. The second interval is immediately subsequent to the first interval. An amount of light energy to be emitted at a pixel during the time is determined based on the image. A first portion of the light energy is generated at the pixel in the first interval. The first portion comprises as much of the light energy as is generatable in the first interval. A second portion of the light energy is generated at the pixel in the second interval based on the light energy generatable in the first interval being less than the amount of light energy to be emitted at the pixel during the time.

Abstract: A display panel includes a plurality of array sites arranged in an array defined by a plurality of rows and a plurality of columns. The display panel includes a first area of the array having a first pixel density and a second area of the array having a second pixel density lower than the first pixel density. The second area of the array includes a plurality of the array sites that are devoid of pixels. Rows of the second area that border the first area include at least one pixel and columns of the second area that border the first area include at least one pixel.

Abstract: Disclosed are a detection method for static image of a video, a detection terminal, and a computer-readable storage medium. The method includes: obtaining a frame image from the video as a reference frame image in a playback order, obtaining an image set comprising n frame images after the reference frame image in the playback order; sequentially determining whether first (n?1) frame images in the currently obtained image set satisfy a preset static image brightness requirement; determining whether a nth frame image in the image set satisfies a preset gray histogram judgment condition; determining whether a stop condition is satisfied according to the reference frame image and the nth frame image in the currently obtained image set; if the above determination results are yes, determining that a video image including the frame images from the reference frame image to the nth frame image in the current image set is a static image.

Abstract: A system calibrates luminance of an electronic display. The system includes an electronic display, a luminance detection device, and a controller. The luminance detection device is configured to measure luminance parameters of active sections of the electronic display. The controller is configured to instruct the electronic display to activate sections in a sparse pattern and in a rolling manner and instruct the luminance detection device to measure luminance parameters for each of the active sections in the sparse pattern. The controller generates calibration data based on the measured luminance parameters of sections in the sparse pattern.

Abstract: The purpose of the present invention is to provide a display system capable of preventing a change in gradation characteristics from reducing the visibility of an image. The present invention provides a display system that includes a display unit and a display control unit, wherein: the display control unit includes a gradation characteristic converter; the gradation characteristic converter converts first gradation characteristics to second gradation characteristics; the first gradation characteristics maintain a constant level of the difference in the JND correspondence value between each gradation value; the gradation characteristic converter performs the conversion to maintain a constant level of the difference in JND correspondence value between each gradation value which is controlled by the second gradation characteristics; and the display unit displays input image data as an image at a luminance corresponding to the second gradation characteristics.

Abstract: A driving method for a display panel and a display device are provided. The driving method includes: dividing a one-frame period of the display panel into N sub-frames, and setting a light-emitting duration of each sub-frame, where N is a positive integer greater than 1, and i=1 to N; determining, based on a target display brightness value L, a number k of sub-frames in which a sub-pixel is to be driven to emit light, and when k<N, a light-emitting duration of any of the k sub-frames is shorter than a light-emitting duration of any other sub-frame of the N sub-frames in which the sub-pixel is not to be driven to emit light; acquiring a light-emitting brightness value Lemit of the sub-pixel in each of the k sub-frames based on L; and driving the sub-pixel to emit light with the light-emitting brightness value Lemit in each of the k sub-frames.

Abstract: Disclosed are a pixel structure and a display apparatus. The pixel structure includes a number of repeated units arranged in an array. Each repeated unit comprises one sub-pixel of a first color, two sub-pixels of a second color, and two sub-pixels of a third color. The first color, the second color, and the third color are different from one another, and on each side of the sub-pixel of the first color is arranged with one of the sub-pixels of the second color and one of the sub-pixels of the third color.

Abstract: An electronic device including: a display including light emitting elements; a memory storing correction coefficients of the light emitting elements of the display; and a processor configured to identify gray scale information and color information of an input image based on pixel information of the input image, based on the gray scale information of the input image being less than a threshold gray scale, adjust a correction coefficient, among the correction coefficients, of a light emitting element among the light emitting elements of the display based on the color information of the input image, and obtain an output image based on the adjusted correction coefficient.

Abstract: A luminance controlling unit includes a luminance controller that controls luminance of a pixel array. The pixel array includes pixels each including a current-driven self-luminescent element. The luminescent controller sets, on the basis of an image signal corresponding to a frame image, a threshold that is directed to detection of a maximum signal level of the image signal, and performs dynamic control of a potential difference between a first voltage and a second voltage on the basis of the maximum signal level detected with reference to the set threshold. The first voltage is outputted from a first voltage source adjacent to an anode of the self-luminescent element, and the second voltage is outputted from a second voltage source adjacent to a cathode of the self-luminescent element.

Abstract: Described are examples for adjusting display level properties across multiple displays. One or more ranges of display brightness capability values that are supported by a given display device can be received for multiple display devices. For each of the multiple display devices, at least a portion of display brightness capability values in the one or more ranges of display brightness capability values can be mapped to selectable brightness levels available in an operating system. One of the selectable brightness levels can be determined as selected via the operating system. For each of the multiple display devices, a corresponding display brightness capability value mapped to the one of the selectable brightness levels can be determined and indicated to each of the multiple display devices, such that the multiple display devices may set different display brightness capability value brightness, but the brightness may be perceptually similar across the display devices.

Abstract: An apparatus is described. The apparatus includes a plurality of physically unclonable circuits. The apparatus includes circuitry to detect which ones of the physically unclonable circuits are unstable. The apparatus also includes circuitry to couple the unstable physically unclonable circuits to a random number generator circuit.

Abstract: The present application discloses a method for displaying image using a display panel. The method includes receiving a frame of image data, which is divided into a first portion and a second portion based on that each sub-pixel in the first portion has an initial grayscale value smaller than that of each subpixel in the second portion. The method includes converting the frame of image data into N frames of image data. Each sub-pixel in the first portion is provided with a first grayscale value in K of the N frames and a second grayscale value in N-K of the N frames, and each sub-pixel in the second portion is retained with its initial grayscale value. N is no smaller than 2 and K varies from 1 to N?1. The method includes displaying each of the N frames of images respectively based on the N frames of image data according to a frame refreshing frequency.

Abstract: A display device is provided, which includes a display, a ditherer configured to perform dithering of video data displayed on the display, an illumination sensor configured to sense illumination around the display device, and a processor configured to control driving of the ditherer on the basis of a grayscale level of the video data if or when the sensed illumination is lower than a predetermined value.

Abstract: Methods are provided for detecting correct or incorrect operation of a display panel (e.g. LED or OLED) during display of a video signal, the display panel being associable with a controller system. The method comprises: adding, by the controller system, a dynamic pattern into the video signal for inducing the display panel to display the video signal with the added dynamic pattern substantially imperceptible to human vision, and to provoke an expected power consumption evolution during the display of the video signal with the added dynamic pattern; measuring, by the controller system, power consumed by the display panel during the display of the video signal with the added dynamic pattern to determine an actual power consumption evolution; and determining, by the controller system, whether the actual power consumption evolution corresponds to the expected power consumption evolution. Controller systems and computer programs suitable for performing such detection methods are also provided.

Abstract: The present disclosure provides a method and an apparatus for establishing a luminance compensation model, a method and an apparatus for compensating for the luminance of a display screen, and a display device. The method for establishing a luminance compensation model for compensating for the luminance of a display screen includes acquiring an accumulated light emission amount of the display screen, if the accumulated light emission amount of the display screen falls within one of a plurality of predefined threshold intervals of light emission amount, determining a luminance compensation coefficient for the display screen corresponding to the one threshold interval of light emission amount, and establishing a luminance compensation model, which indicates a correlation between each of the plurality of threshold intervals of light emission amount and the corresponding luminance compensation coefficient.

Abstract: An organic light emitting diode (OLED) display is discussed. The OLED display is capable of duty driving for controlling an emission duty of an OLED in one frame. One frame for the duty driving includes a programming period, an emission period, and a non-emission period. In the programming period, a first data voltage is applied to a gate node in response to a scan signal and a reference voltage is applied to a source node in response to a sensing signal. In the non-emission period, a second data voltage is applied to the gate node in response to the scan signal. The first data voltage corresponds to input video data to be applied to a first pixel. The second data voltage corresponds to input video data to be applied to a second pixel different from the first pixel.

Abstract: An organic light emitting diode display and a method for driving the same are disclosed. The organic light emitting diode display includes a display panel including a plurality of pixels, a display panel driver configured to drive signal lines of the display panel, and a timing controller configured to divide one frame into a plurality of subframes, divide data of an input image at each bit, map the data of the input image to the plurality of subframes, control an operation of the display panel driver, and adjust data addressing speeds of the plurality of subframes for adjusting the emission times of the upper and lower display lines of the display panel differently.

Abstract: Display brightness adjustment apparatus and methods are described in which the average brightness of a display may be scaled up or down using a non-linear function. When applying the non-linear function to scale down brightness, the contrast of the output signal may not be reduced so that the dynamic range and highlights are preserved. The non-linear brightness adjustment may be performed automatically, for example in response to ambient light level as detected by sensor(s), but may also be applied in response to a user adjustment to a brightness control knob or slider. The non-linear brightness adjustment may be performed globally, or alternatively may be performed on local regions of an image or display panel. The non-linear function may be a piecewise linear function, or some other non-linear function.

Abstract: The present disclosure provides a voltage controlling circuit of a T-CON load variation, a display panel and a display device. The voltage controlling circuit of the T-CON load variation includes: a power source chip and a voltage controlling circuit, and the voltage controlling circuit includes a photoelectric coupler, a first comparator, a second comparator, a first field effect transistor and a second field effect transistor. Therefore, the technical scheme of the present disclosure has an advantage that the Vcore may automatically vary with a variation of the load.

Abstract: A circuit and method for detecting a vertical cut in a sequence of digital video images. Each pixel of a video frame is filtered then compared to a filter threshold. If the threshold is met, a current pixel bit is set as active. A delayed pixel bit is generated from the current pixel bit, and a changed pixel bit is generated if either but not both of the current pixel bit and the delayed pixel bit is active. Active pixels are counted. The count of active pixels in the current image and the count of active pixels in the delayed image are used to weight the active pixel count of the changed image. The counts are used to determine a change value for the current image. The change value may be a large positive value, a large negative value, or neither. A predefined pattern of the change values over a sequence of frames indicates a vertical cut in the sequence.

Abstract: A display device is disclosed in which a luminance control device includes a temperature sensor that detects a temperature of a display device; an average picture level part that calculates an average picture level, which defines an average brightness of an image input into the display device; and a luminance control part that generates a temperature-dependent peak luminance, which varies with temperature and average picture level, based on a top gain curve defining how a maximum luminance decreases as the temperature of the display device rises and a bottom gain curve defining how a minimum luminance decreases as the temperature of the display device rises, wherein the luminance control part fixes the temperature-dependent peak luminance at a specific luminance level, regardless of changes in average picture level, at a specific temperature in a high-temperature range which is higher than a room-temperature range.

Abstract: An image correcting unit including: a data converting unit which receives image data, and generates display data by converting respective grayscale values which are included in the image data to high pixel data and low pixel data; and a white pixel detecting unit which detects image data lines which include not less than a first number of white grayscale values from the image data, and outputs a conversion signal when not less than a second number of the detected image data lines are successively arranged, wherein upon receiving the conversion signal from the white pixel detecting unit, the data converting unit converts the white grayscale values which are included in the successively arranged image data lines to first high pixel data and first low pixel data, wherein the first high pixel data and the first low pixel data have a different value from each other.

Abstract: There is provided an organic light emitting display that includes a plurality of pixels are arranged in a plurality of rows and columns Each of the pixels includes a plurality of sub pixels. At least one sub pixel of the plurality of sub pixels of at least one pixel is divided into a plurality of divisional sub pixels. Since the divisional sub pixels alternately emit light, it is possible to reduce deterioration speed of the sub pixels, thereby preventing an afterimage from being generated by deterioration of the sub pixels.

Abstract: A pixel array composes of a plurality of basic pixel units arranged in row and column directions. Each of the basic pixel units consists of a first sub-pixel group composed of two adjacent first sub-pixel having a first color, a second sub-pixel group composed of two adjacent second sub-pixels having a second color, and two third sub-pixel groups, each of which is composed of two adjacent third sub-pixels having a third color. The distance between the two adjacent first, second, third sub-pixels, in row or column direction is smaller than a first predetermined value. The two adjacent third sub-pixel groups are arranged at a first row, and located at a first, third columns respectively, and the first, second sub-pixel group are arranged at a second row, wherein, the first sub-pixel group is located at a second column, and the other is located at a fourth column.

Abstract: An image processing apparatus and method thereof are provided. The image processing apparatus includes a false contour detection circuit and a false contour reduction circuit. The false contour detection circuit includes detection modules and a determination module. The detection modules respectively detect different features of the same image input signal and correspondingly output feature coefficients. The determination module is coupled to the detection modules and determines a false contour coefficient according to the feature coefficients. The false contour reduction circuit is coupled to the determination module of the false contour detection circuit to receive the false contour coefficient and perform false contour reduction on the image input signal according to the false contour coefficient, so as to output a corresponding image output signal.

Abstract: An image processing apparatus and an image processing method are provided. The image processing apparatus comprises a false contour detection circuit and a false contour reduction circuit. The false contour detection circuit is configured to detect a flat pixel distribution of an image input signal and correspondingly output a false contour coefficient. The false contour reduction circuit is coupled to the false contour detection circuit to receive the false contour coefficient, and is configured to perform false contour reduction on the image input signal according to the false contour coefficient, so as to correspondingly output an image output signal.

Abstract: Power levels of a backlight are adjusted in a number of ways and based on a number of criteria. The adjustments result in a lower power consumption and, in some cases, may enhance audience attention to important objects in a scene. The adjustments comprise, for example, a combination of ramping down power (lowering final display brightness) in concert with corresponding compensatory LCD adjustments (increasing final display brightness). The adjustments may also include, for example, system dimming after ramp down/LCD adjustments are exhausted, or the shifting of an LDR2HDR curve.

Abstract: A projector including: a plurality of light sources; a modulator that modulates light emitted from each of the plurality of light sources; a projection unit that projects the modulated light modulated by the modulator; a storage unit that stores grayscales of the light sources and adjustment values for adjusting the light emission amounts of the light sources in order to make white balance of the modulated light projected through the projection unit in relation to each other; and a light-emission-amount adjusting unit that adjusts the light emission amounts of the light sources based on the adjustment values corresponding to the grayscales of the light sources.

Abstract: A display panel driver that includes a compensating value generating part, a compensating lookup table and a compensating part. The compensating value generating part generates an offset and a compensating grayscale based on luminances of pixels of a display panel. The compensating lookup table stores the offset and the compensating grayscale. The compensating part compensates an input grayscale of the pixel to generate a data signal using the compensating lookup table.

Abstract: The described technology relates generally to an organic light emitting display and a method for driving the same. According to an exemplary embodiment, an image is displayed by dividing one frame into a plurality of sub-fields, and a gamma curve is realized with a combination of a plurality of sub-fields respectively corresponding to a plurality of grays of image data so that image data can be compensated without adding a memory. In addition, the embodiment can extract the one combination by setting a combination of sub-fields that exceeds one frame time among the plurality of sub-fields to be an exception condition.

Abstract: A pulse width modulation (PWM) signal generator generates a PWM signal having a specified effective PWM duty resolution for a corresponding cycle window. The PWM signal generator receives an N-bit value representing a duty to be implemented and sets values X and Y to the M least significant bits and the N-M most significant bits, respectively, of the N-bit value. The value M can be determined based on the value N and a maximum implementable frequency of a clock signal used to time the generation of each PWM cycle. The PWM signal generator generates a cycle window of 2M PWM cycles, each PWM cycle of the cycle window having a duty of either Y or Y+1. The number of PWM cycles in the cycle window having the duty Y+1 is based on the value X and the PWM cycles having a particular duty are contiguous within the cycle window.

Abstract: A method of operating an organic light emitting diode (OLED) display device and an OLED display using the method are disclosed. In one aspect, input data is received, the input data is converted into mapped data based on random data mapping information, one sub-frame pattern is selected from a plurality of sub-frame patterns based on the random data mapping information, and an image is formed for the display device based on the mapped data and the selected sub-frame pattern.

Abstract: A display device includes a display panel including a display region and first and second drivers. Feature data indicating feature values of first and second images displayed on first and second portions of the display region are exchanged between the first and second drivers, and the first and second drivers drive the first and second portions of the display region in response to the feature data.

Abstract: A display sheet has a display layer, a first electrode on one side of the display layer, a second electrode on another side of the display layer, and an electrode protection layer between the display layer and the first electrode. The display layer has a partition structure dividing the display layer into a plurality of regions and a liquid dispersion filling the individual regions. The electrode protection layer and the partition structure are integrally formed and both mainly composed of an electroconductive polymer.

Abstract: A display device including a data mapping unit configured to identify a minimum value of the three-color input data corresponding to red, green, and blue (RGB), to determine white output color data by multiplying the identified minimum value by a gain ratio, and to subtract the white output color data from each of the three-color input data to determine RGB output color data, a gain adjustment unit configured to determine a preliminary gain ratio to minimize standard deviations of each of the white and RGB output color data, and to change a preliminary gain ratio based on an accumulated sum of color data used for respective sub-pixels in a previously displayed image to determine the gain ratio, and a display unit including unit pixels, each including RGB and white sub-pixels, and configured to display an image which corresponds to the and RGB output color data.