KR102408715B1 - Image display device and method for driving the same - Google Patents

Abstract

Disclosed are an image display device and a driving method thereof. An image display device according to an embodiment of the present invention provides an image display panel that displays an image through a plurality of pixels, aligns image data input from the outside, transmits it to a data driver, generates data and gate control signals, and generates a gate and a data driver a timing controller for controlling , and a deviation compensating unit configured to analyze image data in units of at least one frame to compensate for a reference voltage applied to each pixel according to a grayscale deviation between adjacent sub-pixels or unit pixels and adjacent pixel regions As such, it is possible to prevent image display defects due to grayscale deviation between adjacent pixels and adjacent pixel areas and improve image quality.

Description

Image display device and its driving method

The present invention relates to an image display device and a method for driving the same, which prevent image display defects due to grayscale deviation between adjacent pixels and adjacent pixel regions and improve display quality.

As the information society develops, the demand for an image display device for displaying an image is increasing in various forms, and in recent years, a liquid crystal display device (Liquid Crystal Display Device), a field emission display device (Field Emission Display Device), and an organic Various image display devices such as an organic light emitting display device and a quantum dot display device are being used.

Among them, in the organic light emitting diode display, a plurality of sub-pixels are arranged in a matrix form on an image display panel, and each sub-pixel adjusts luminance according to a gray level of video data to display the same. Each of the sub-pixels includes an organic light emitting diode (hereinafter, OLED) and a driving TFT (Thin Film Transistor) that controls a driving current flowing through the OLED according to a gate-source voltage. The luminance of each sub-pixel is proportional to the size of the driving current flowing through the OLED, and this driving current is affected by the electrical characteristics between the gate and the source of the driving TFT.

However, in the conventional organic light emitting diode display device, when pixels adjacent to each other or when the grayscale deviation between adjacent pixel regions increases, parasitic capacitors existing in the adjacent pixels are affected, so that the driving current flowing through the OLED is distorted. Occurs. For example, a high grayscale white image is displayed in specific pixels or pixel areas, and a low grayscale black image is displayed in other pixels or pixel areas adjacent thereto, and the grayscale deviation between adjacent pixels or pixel areas is large. may be displayed.

In this case, the parasitic capacitors of the pixels located in the periphery of the pixel region in which the grayscale deviation is displayed are greatly affected by the data voltage and the reference voltage that vary widely, and thus the driving current flowing through the OLED is distorted. Accordingly, an image display defect in which an image with distorted luminance is displayed in the form of vertical or horizontal horizontal lines occurs in the pixels or the peripheral region of the pixel regions in which the grayscale deviation is large, and when the defect is visually recognized, the reliability is lowered. .

The present invention has been devised to solve the above problems, and the present invention compensates for a reference voltage applied to each pixel to correspond to a grayscale deviation between adjacent pixels and adjacent pixel areas, thereby reducing image display defects due to grayscale deviation. An object of the present invention is to provide an image display device and a driving method thereof that can prevent and improve image quality.

An image display device according to the present invention for achieving the above technical problem aligns an image display panel that displays an image through a plurality of pixels, image data input from the outside, transmits it to a data driver, and generates data and a gate control signal The timing controller for controlling the gate and the data driver, and the image data are analyzed in units of at least one frame to determine the reference voltage applied to each pixel according to the gradation deviation between adjacent sub-pixels or unit pixels and adjacent pixel regions. and a deviation compensating unit for compensating.

In addition, an image display device according to the present invention for achieving the above technical problem includes the steps of arranging image data input from the outside and transmitting it to the data driver, generating data and a gate control signal to control the gate and the data driver , driving a gate and a data line of an image display panel to display an image, and analyzing the image data in units of at least one frame according to a gradation deviation between adjacent sub-pixels or unit pixels and adjacent pixel regions. and compensating for a reference voltage applied to each pixel.

An image display device and a method of driving the same according to an embodiment of the present invention having the above-described technical characteristics compensate for a reference voltage applied to each pixel to correspond to a grayscale deviation between adjacent pixels and adjacent pixel regions, thereby providing grayscale. It has the effect of preventing image display defects due to deviation and improving image quality.

In particular, there is an effect that can further improve the reliability of the product to which the image display device of the present invention is applied by preventing a defect in image display in the surrounding area even when the gray scale deviation is large.

1 is a block diagram showing an image display device according to an embodiment of the present invention.
FIG. 2 is a circuit diagram illustrating one sub-pixel arranged on the image display panel of FIG. 1 .
3 is a diagram illustrating an image display screen in which display luminance of adjacent pixels is distorted according to a grayscale deviation between adjacent pixels and pixel regions of image data.
FIG. 4 is a configuration block diagram specifically illustrating the compensation setting unit shown in FIG. 1 .
FIG. 5 is a diagram illustrating grayscale values of image data arranged in the data alignment unit shown in FIG. 4 for each sub-pixel area.
FIG. 6 is a diagram illustrating a grayscale range value set by the grayscale range setting unit shown in FIG. 4 for each sub-pixel area.
7 is a graph for explaining a reference voltage compensation method of the compensation value setting unit shown in FIG. 4 .
8 is a diagram illustrating a grayscale range value set by the data grayscale range setting unit shown in FIG. 4 for each unit pixel area.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing an image display device according to an embodiment of the present invention.

The image display device illustrated in FIG. 1 includes an image display panel 10 , a gate driver 20 , a data driver 30 , a power supply unit 40 , a timing controller 50 , and a deviation compensator 100 .

The image display panel 10 may be a quantum dot display device, an organic light emitting diode display panel, or the like. Hereinafter, an example to which the organic light emitting diode display panel is applied will be described.

The image display panel 10 displays an image through a plurality of pixels, specifically, a plurality of sub-pixels P. The plurality of sub-pixels P are arranged in a matrix form in each pixel area to display an image with luminance according to data grayscale. To this end, each sub-pixel P includes an organic light emitting diode (hereinafter, OLED) and a diode driving circuit independently driving the OLED. The diode driving circuit supplies the analog data signals from the data lines DL respectively connected to the OLED using the driving TFT, while maintaining the charged state of the analog data signal so that the light emitting state is maintained. In addition, the diode driving circuit causes the reference voltage RV input through the reference voltage supply line FL to be supplied to the OLED according to the switching driving of the compensation TFT. Here, the compensation level of the reference voltage RV transmitted to the OLED of each sub-pixel P through the compensation TFT is set in the deviation compensator 100 , and is supplied from the deviation compensator 100 or the power supply unit 40 . can be supplied. Such a structure of each sub-pixel P of the image display panel 10 and a structure of supplying a compensation reference voltage RV will be described later in more detail with reference to the accompanying drawings.

The gate driver 20 sequentially drives the gate lines GL1 to GLn of the image display panel 10 . To this end, the gate driver 20 responds to a gate control signal GVS, for example, a gate start pulse (GSP) and a gate shift clock (GSC) from the timing controller 50 . A gate-on signal is sequentially generated. In addition, the pulse width of the sequentially generated gate-on signal is controlled according to a gate output enable (GOE) signal, and is sequentially supplied to the gate lines GL1 to GLn.

The gate driver 20 may sequentially drive the compensation lines CL1 to CLn as well as the gate lines GL1 to GLn of the image display panel 10 . The gate driver 20 may sequentially supply the gate-on signal to each of the compensation lines CL1 to CLn in the same manner as in the method of sequentially supplying the gate-on signal to each of the gate lines GL1 to GLn. However, the timing at which the gate-on signal is supplied to each of the compensation lines CL1 to CLn may be the same as the timing at which the gate-on signal is supplied to each of the gate lines GL1 to GLn, but differ by a preset delay period. Delivery may be delayed. This may be supplied with the same or different delay depending on the diode driving circuit driving characteristics of each sub-pixel P, that is, the turn-on timing of the driving TFT and the compensation TFT of the diode driving circuit.

The data driver 30 drives the data lines DL1 to DLm of the image display panel 10 . That is, the data driver 30 supplies the image signal of each pixel region P to the data lines DL1 to DLm of the image display panel 10 . To this end, the data driver 30 uses a source start pulse (SSP) and a source shift clock (SSC) among the data control signals DVS from the timing controller 50 to perform timing The compensation data R'G'B' from the controller 50 is converted into an analog voltage, that is, an analog image signal. In addition, an image signal is supplied to each of the data lines DL1 to DLm in response to a source output enable (SOE) signal. Specifically, the data driver 30 latches the image data Data input according to the SSC, and then one horizontal line for each horizontal period in which a scan pulse is supplied to each of the gate lines GL1 to GLn in response to the SOE signal. An image signal of one minute is supplied to each of the data lines DL1 to DLm.

The timing controller 50 aligns the image data RGB input through the external system or the deviation compensator 100 according to driving characteristics such as image display resolution of the image display panel 10 and supplies it to the data driver 30 . do. In addition, the timing controller 50 generates gate and data control signals GVS and DVS using synchronization signals (not shown) input from the outside, and supplies the gate and data control signals GVS and DVS to the gate and data drivers 20 and 30 to provide a gate and controlling driving timings of the data drivers 20 and 30 . The timing controller 50 may transmit image data RGB input from an external system, etc. to the deviation compensating unit 100 , and conversely, may receive image data RGB input from the outside through the deviation compensating unit 100 . have.

The deviation compensator 100 analyzes the image data RGB inputted from the outside or through the timing controller 50 in units of at least one frame, and the sub-pixel P or unit pixel adjacent to each other and the gradation between adjacent pixel areas. The reference voltage RV applied to each sub-pixel P is compensated according to the deviation. Here, the unit pixel is a pixel unit that implements a color by a combination of red, green, and blue sub-pixels P.

1 , the deviation compensator 100 may include a compensation setting unit 110 and a reference voltage compensator 120 .

The compensation setting unit 110 substitutes a grayscale range value according to the grayscale range to which the grayscale value of each sub-pixel P or unit pixel belongs, and replaces the substituted grayscale range value with a horizontal line (or horizontal pixel row) and a vertical line It is summed in units of lines (or vertical pixel columns), and it is determined whether each sub-pixel P or unit pixel needs to be compensated according to the summation result value. In addition, the reference voltage compensator 120 compensates the reference voltage RV of each sub-pixel P or unit pixel according to whether or not compensation of each sub-pixel P or unit pixel is required to thereby compensate each sub-pixel P or each sub-pixel P. I transmit it as a unit pixel.

Specifically, after aligning the image data RGB in units of at least one frame, the compensation setting unit 110 aligns the image data RGB in each frame between each sub-pixel P or unit pixel and adjacent pixel areas in the image data RGB of each frame. Analyze the gradation deviation (or gradation value deviation) of . In addition, the reference voltage RV supplied to each sub-pixel P is compensated and output to correspond to a grayscale deviation between adjacent sub-pixels P or unit pixels and adjacent pixel regions, respectively.

The compensation setting unit 110 analyzes the grayscale deviation between adjacent sub-pixels P or unit pixels and adjacent pixel areas for each sub-pixel P. First, the grayscale of each sub-pixel P or unit pixel is analyzed. The grayscale value of each sub-pixel P is set to a preset grayscale range value (for example, low grayscale is 0, middle grayscale is 1, high grayscale is The gradation is replaced with 2). And by summing the grayscale range values for each horizontal line and vertical line unit in the frame data in which the grayscale values of each sub-pixel P or unit pixel are all substituted with the grayscale range values, the summation result value is calculated for each horizontal line and vertical line. derive

The compensation setting unit 110 determines whether compensation is necessary for each sub-pixel P according to the summation result for each horizontal line and vertical line to which the corresponding sub-pixel P belongs. The compensation control signal C_Data is generated so that only the reference voltage RV of a preset voltage level is supplied to each sub-pixel P that does not require compensation.

On the other hand, compensation control is performed so that the reference voltage RV can be compensated (for example, boosted) according to the result of summing the horizontal line or vertical line for the sub-pixel P or unit pixel determined to require compensation. generate a signal At this time, the compensation setting unit 110 sets the compensation voltage level set in the look-up table to correspond to the result value of the horizontal line or the vertical line including each sub-pixel P for which the compensation is determined. A compensation control signal C_Data is generated to compensate the reference voltage RV.

The reference voltage compensator 120 compensates for the reference voltage RV of the sub-pixels P determined to be compensated according to the compensation control signal C_Data and supplies it to each reference voltage supply line FL. Contrary to this, the compensation setting unit 110 supplies a compensation control signal to a separate power supply unit 40, so that the compensation control signal from the power supply unit 40 determines the compensation of the sub-pixel P reference voltage RV. can be compensated to be supplied to each reference voltage supply line FL. The compensation setting unit 110 and the reference voltage compensator 120 will be described later in more detail with reference to the accompanying drawings.

FIG. 2 is a circuit diagram illustrating one sub-pixel arranged on the image display panel of FIG. 1 .

As shown in Fig. 2, each sub-pixel P includes an OLED, a driving TFT Tr1, a switching TFT Tr2, a storage capacitor Cst, and a compensation TFT Tr3.

The switching TFT Tr2 transmits an image signal from one data line DL1 to a source terminal of the driving TFT Tr1 connected to the first node according to a gate-on signal from one gate line GL1.

The driving TFT Tr1 controls the driving current flowing to the OLED connected to the second node according to the voltage between the power signal VDD of the gate terminal and the source terminal connected to the first node. The storage capacitor Cst is electrically connected between the first node and the second node, so that the driving current flowing to the OLED can be maintained according to the charge amount of the image signal.

The compensation TFT Tr3 is electrically connected between the second node, which is an OLED input terminal, and one reference voltage supply line FL, and the reference voltage supply line FL according to the gate-on signal from the one compensation line CL1. The reference voltage RV input through the or the reference voltage RV in a compensated state is transmitted to the second node (OLED input terminal).

FIG. 3 is a diagram illustrating an image display screen in which display luminance of adjacent pixels is distorted according to a gradation deviation between adjacent pixels and pixel regions of image data.

As illustrated in FIG. 3 , if the grayscale deviation between the adjacent pixel areas Section A and Section B increases, the driving current flowing through the OLED of the adjacent sub-pixels P may be distorted. For example, a high grayscale white image is displayed in a specific pixel area Section A, and a low grayscale black image is displayed in other pixel areas Section B adjacent thereto. and Section B) may have a large gradation deviation. In this case, the sub-pixels P located in the periphery of the pixel regions (Section A and Section B) in which the grayscale deviation is greatly displayed are affected by the data voltage and the reference voltage RV that vary widely, As a result, the driving current flowing through the OLED is distorted. Accordingly, as shown in FIG. 3 , an image display defect in which an image with distorted luminance is displayed in the form of vertical or horizontal horizontal lines may occur in the peripheral regions of the pixel regions (Section A and Section B) in which the grayscale deviation is large. . Accordingly, as presented in the present invention, the image data RGB is analyzed through the deviation compensator 100, and each sub-pixel P or unit pixel adjacent to each other and each sub-pixel according to the gradation deviation between adjacent pixel areas is analyzed. By compensating the reference voltage RV applied to the pixel P, the distortion of the display luminance of the image is prevented even in the peripheral regions of the pixel regions Section A and Section B in which the grayscale deviation is large.

FIG. 4 is a configuration block diagram specifically showing the compensation setting unit shown in FIG. 1 .

The compensation setting unit 110 illustrated in FIG. 4 includes a data alignment unit 111 , a grayscale range setting unit 112 , a compensation pixel setting unit 113 , and a compensation value setting unit 114 .

The data alignment unit 111 aligns the image data RGB in units of at least one frame to match the display resolution of the image display panel 10 . Then, the aligned image data RGB is transmitted to the grayscale range setting unit 112 in units of at least one frame.

FIG. 5 is a diagram illustrating grayscale values of image data arranged in the data alignment unit shown in FIG. 4 for each sub-pixel area.

As shown in FIG. 5 , the data aligning unit 111 converts the grayscale value of the image data RGB in units of at least one frame so as to analyze the grayscale deviation between the adjacent sub-pixels P and the adjacent pixel areas. They are arranged and transmitted to the grayscale range setting unit 112 .

Specifically, the data aligning unit 111 analyzes the grayscale deviation of the image data RGB in units of each sub-pixel P to set whether to compensate the reference voltage RV in units of the sub-pixels P; The grayscale values of the image data RGB are arranged in units of each sub-pixel P. In addition, the grayscale value alignment data may be transmitted to the grayscale range setting unit 112 in units of each frame.

At this time, the data aligning unit 111 aligns the image data RGB using the data control signal DVS or the gate control signal GVS from the timing controller 50, so that the image display timing of the image data RGB is The image data RGB may be sorted and outputted so as to correspond to .

FIG. 6 is a diagram illustrating a grayscale range value set by the grayscale range setting unit shown in FIG. 4 for each sub-pixel area.

Referring to FIG. 6 , the grayscale range setting unit 112 replaces the grayscale value of each sub-pixel P with a preset grayscale range value, thereby generating frame data in which all grayscale values are substituted with the grayscale range value.

Specifically, the grayscale range setting unit 112 determines the grayscale value of each subpixel P first to analyze the grayscale deviation between the adjacent subpixels P and the adjacent pixel regions for each subpixel P. The grayscale value of each sub-pixel P is replaced with a preset grayscale range value according to the range it belongs to.

For example, when the grayscale value of each sub-pixel P belongs to 0 to 15 grayscales of the low grayscale, the grayscale range setting unit 112 may replace the grayscale range value with 0, which is the low grayscale range value. In addition, when the grayscale value of each sub-pixel P belongs to 16 to 249 grayscales of the intermediate grayscale, the grayscale range setting unit 112 may replace the grayscale range value with 1, which is the intermediate grayscale range value. Also, when the grayscale value of each sub-pixel P belongs to 250 to 255 grayscales of the high grayscale, the grayscale range setting unit 112 may replace the grayscale range value with 2, which is the high grayscale range value. The substituted frame data is transmitted to the compensation pixel setting unit 113 .

Accordingly, as shown in FIG. 6 , the compensation pixel setting unit 113 sums the grayscale range values for each horizontal line and each vertical line of the frame data, and derives a sum result value (sum) for each horizontal line and vertical line. In addition, it is determined whether the reference voltage RV of each sub-pixel P is compensated according to the sum of the horizontal line and the vertical line including each sub-pixel P. Compensation is determined when the sum of at least one of the sum of the horizontal line and the vertical line including each sub-pixel P is equal to or greater than a preset reference value, the sub-pixel requiring compensation. (P) can be determined.

FIG. 7 is a graph for explaining a reference voltage compensation method of the compensation value setting unit illustrated in FIG. 4 .

Referring to FIG. 7 , the compensation value setting unit 114 is configured to correspond to the sum of the horizontal line and the vertical line including each sub-pixel P determined to be compensated by the compensation pixel setting unit 113 to correspond to the sum of the result value sum. The compensation control signal C_Data is generated to compensate the reference voltage RV of the sub-pixel P with the compensation voltage level set in the look-up table.

As shown in FIG. 7 , a reference voltage compensation value ΔRV compared to a horizontal line sum value Δsum is preset in the look-up table. In addition, the reference voltage compensation value ΔRV compared to the vertical line sum value Δsum is also set in the look-up table.

In the compensation value setting unit 114 , the look-up table is based on the larger sum of the sum of the horizontal line and the vertical line including each sub-pixel P for which the compensation is determined. The voltage compensation value ΔRV may be output to compensate the reference voltage RV of the sub-pixel P.

On the other hand, the compensation control signal C_Data is generated so that only the reference voltage RV of a preset voltage level is supplied to each sub-pixel P that does not require compensation.

The reference voltage compensator 120 may compensate for the reference voltage RV of the sub-pixels P determined to be compensated according to the compensation control signal and supply it to each reference voltage supply line FL.

8 is a diagram illustrating a grayscale range value set by the data grayscale range setting unit shown in FIG. 4 for each unit pixel area.

As shown in FIG. 8 , the data aligning unit 111 performs image data RGB in units of unit pixels of the image display panel 10 (that is, pixels in which red, green, and blue sub-pixels P are combined). You can sort the grayscale values. In addition, the grayscale value alignment data may be transmitted to the grayscale range setting unit 112 in units of each frame.

Accordingly, the grayscale range setting unit 112 may generate frame data in which all grayscale values are substituted with the grayscale range values by replacing the grayscale value of each unit pixel with a preset grayscale range value. The frame data replaced by the grayscale range setting unit 112 is transmitted to the compensation pixel setting unit 113 .

The compensation pixel setting unit 113 derives a sum result value sum for each horizontal line and each vertical line by summing the grayscale range values for each horizontal line and vertical line for each unit pixel of the frame data. In addition, it is determined whether the reference voltage RV of each sub-pixel P is compensated according to the sum of horizontal lines and vertical lines for each unit pixel including each unit pixel.

Accordingly, in the compensation value setting unit 114 , the compensation set in the look-up table to correspond to the sum of the horizontal line and the vertical line including each unit pixel determined to be compensated by the compensation pixel setting unit 113 . A compensation control signal C_Data is generated to compensate the reference voltage RV of the sub-pixel P with a voltage level.

Finally, the reference voltage compensator 120 may compensate for the reference voltage RV of the sub-pixels P determined to be compensated according to the compensation control signal C_Data and supply it to each reference voltage supply line FL.

As described above, the image display device and the method for driving the same according to an embodiment of the present invention compensate for the reference voltage applied to each sub-pixel to correspond to the grayscale deviation between the adjacent sub-pixels and the adjacent pixel regions, It is possible to prevent image display defects due to gradation deviation and improve image quality.

In particular, as shown in FIG. 3 , even when a large grayscale deviation is displayed, image display defects in the surrounding area are prevented, thereby further improving the reliability of the product to which the image display devices of the present invention are applied.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the technical field to which the present invention pertains that various substitutions, modifications and changes are possible without departing from the technical matters of the present invention. It will be clear to those who have the knowledge of Therefore, the scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

10: video display panel
20: gate driver
30: data driving unit
40: power supply
50: timing control
100: deviation compensation unit
110: compensation setting unit
120: reference voltage compensator

Claims (13)

an image display panel for displaying an image through a plurality of pixels;
a timing controller that aligns image data input from the outside and transmits it to the data driver, and generates data and gate control signals to control the gate and data driver; and
The image data is analyzed in units of at least one frame to determine whether compensation for grayscale deviation between adjacent sub-pixels or unit pixels and adjacent pixel areas is necessary, and a reference voltage applied to each pixel according to the grayscale deviation A deviation compensating unit for compensating for
The deviation compensator may be configured to substitute a grayscale range value according to a grayscale range to which the grayscale value of each sub-pixel or unit pixel belongs, and add the substituted grayscale range values in units of horizontal pixel rows and vertical pixel columns, and the summing and a compensation setting unit to determine whether compensation of each of the sub-pixels or the unit pixels is necessary according to a result value.
delete The method of claim 1,
The deviation compensator
Reference voltage compensation for compensating or boosting the reference voltage of each sub-pixel or unit pixel and transmitting the compensation to each sub-pixel or unit pixel in response to whether or not compensation is required for each sub-pixel or unit pixel determined by the compensation setting unit A video display device comprising a portion.
The method of claim 1,
The compensation setting unit
determining whether each sub-pixel or unit pixel needs compensation, generating a compensation control signal according to the determination result, and transmitting the compensation control signal to a power supply;
The power supply is
An image display device for compensating or boosting a reference voltage of each sub-pixel or unit pixel requiring compensation according to a compensation control signal from the compensation setting unit and transmitting the compensation to each sub-pixel or unit pixel.
The method of claim 1,
The compensation setting unit
a data aligning unit for arranging image data in units of at least one frame to match the display resolution of the image display panel;
a grayscale range setting unit generating frame data in which all of the grayscale values are substituted with the grayscale range values by replacing the grayscale values of each of the sub-pixels or the unit pixels with a preset grayscale range value;
A summation result value is derived by summing the grayscale range values for each horizontal line and vertical line of the frame data, and each sub-pixel or unit pixel is included in the horizontal line and the vertical line according to the summation result value. a compensation pixel setting unit that determines whether a reference voltage of a pixel or a unit pixel is compensated; and
A compensation control signal is provided to compensate the reference voltage of the sub-pixel or unit pixel with the compensation voltage value set in the look-up table to correspond to the result of summing the horizontal line and the vertical line including each of the sub-pixels for which the compensation is determined. Compensation value setting unit to generate;
A video display device comprising a.
6. The method of claim 5,
The compensation pixel setting unit
An image display device for determining a sub-pixel or unit pixel requiring compensation when the sum result value of at least one of the sum result values for each sub-pixel or unit pixel is greater than or equal to a preset reference value.
6. The method of claim 5,
The compensation value setting unit
The reference voltage compensation value of the look-up table is outputted according to the larger of the summation result value of the horizontal line and the vertical line including each sub-pixel or unit pixel for which the compensation has been determined, so that the sub-pixel or unit pixel A video display device that compensates for the reference voltage.
aligning the image data input from the outside and transmitting it to the data driver;
generating data and a gate control signal to control a gate and a data driver;
driving a gate and a data line of an image display panel to display an image;
analyzing the image data in units of at least one frame to determine whether compensation for grayscale deviation between adjacent sub-pixels or unit pixels and adjacent pixel areas is necessary; and
Compensating the reference voltage applied to each pixel according to the grayscale deviation;
The step of determining whether compensation for the grayscale deviation is necessary,
substituting a grayscale range value according to the grayscale range to which the grayscale value of each sub-pixel or unit pixel belongs; and
summing the substituted grayscale range values in units of horizontal pixel rows and vertical pixel columns, and determining whether compensation is required for each of the sub-pixels or the unit pixels according to the summation result value;
A method of driving an image display device comprising a.
delete 9. The method of claim 8,
Compensating for the reference voltage
Compensating or boosting the reference voltage of each sub-pixel or unit pixel in response to a result of determining whether compensation is required for each sub-pixel or unit pixel, and transmitting the compensation to each sub-pixel or unit pixel driving method.
9. The method of claim 8,
Compensating for the reference voltage
determining whether each sub-pixel or unit pixel needs compensation, generating a compensation control signal according to the determination result, and transmitting the compensation control signal to a power supply;
Compensating or boosting the reference voltage of each sub-pixel or unit pixel requiring compensation according to the compensation control signal from the compensation setting unit in the power supply unit and transmitting the compensation to each sub-pixel or unit pixel How to operate the device.
9. The method of claim 8,
Compensating for the reference voltage
arranging the image data in units of at least one frame to match the display resolution of the image display panel;
generating frame data in which all of the grayscale values are substituted with the grayscale range values by replacing the grayscale values of each of the sub-pixels or the unit pixels with a preset grayscale range value;
A summation result value is derived by summing the grayscale range values for each horizontal line and vertical line of the frame data, and each sub-pixel or unit pixel is included in the horizontal line and the vertical line according to the summation result value. determining whether to compensate a reference voltage of a pixel or a unit pixel; and
A compensation control signal is provided to compensate the reference voltage of the sub-pixel or unit pixel with the compensation voltage value set in the look-up table to correspond to the result of summing the horizontal line and the vertical line including each of the sub-pixels for which the compensation is determined. generating;
A method of driving an image display device comprising a.
13. The method of claim 12,
The step of determining whether the reference voltage is compensated is
When the summation result value of at least one of the summation result values for each sub-pixel or unit pixel is greater than or equal to a preset reference value, the sub-pixel or unit pixel is determined as a sub-pixel or unit pixel that needs compensation. driving method.

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