KR20170109747A - Display apparatus and method for driving the same - Google Patents

Display apparatus and method for driving the same Download PDF

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Publication number
KR20170109747A
KR20170109747A KR1020160033638A KR20160033638A KR20170109747A KR 20170109747 A KR20170109747 A KR 20170109747A KR 1020160033638 A KR1020160033638 A KR 1020160033638A KR 20160033638 A KR20160033638 A KR 20160033638A KR 20170109747 A KR20170109747 A KR 20170109747A
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South Korea
Prior art keywords
data
compensation
value
pixel
compensation data
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KR1020160033638A
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Korean (ko)
Inventor
전봉출
김충화
송근규
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삼성디스플레이 주식회사
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Priority to KR1020160033638A priority Critical patent/KR20170109747A/en
Publication of KR20170109747A publication Critical patent/KR20170109747A/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters

Abstract

A display device according to an embodiment includes a display panel including a plurality of pixels, a first memory for storing a plurality of compensation data generated by using an image of a display panel displaying test images corresponding to a plurality of reference gradations, A second memory for storing a plurality of gain values corresponding to a plurality of reference gradations, and a signal controller for correcting input image data using a plurality of compensation data and a plurality of gain values.

Description

DISPLAY APPARATUS AND METHOD FOR DRIVING THE SAME [0002]

The present disclosure relates to a display apparatus and a driving method thereof.

A luminance deviation may occur between each pixel due to a characteristic deviation of the pixels and a deviation in the manufacturing process. Specifically, variations in the parasitic capacitance of the transistor and variations in parasitic capacitance between the signal lines, which are caused as the widths of the thin film patterns are differently formed due to variations in exposure amount in the thin film pattern formation step, may occur. These deviations cause a luminance deviation between the pixels, so that the display panel may be stained and the display quality may deteriorate.

After the manufacture of the display panel is completed, screen inspection of the display panel is performed before being released into the product. For example, a display panel for displaying a test image is photographed, luminance distribution data of the display panel is calculated using the photographed image, and compensation data is generated based on the luminance distribution data.

However, since the level of the smear generated on the display panel varies depending on the driving frequency of the display panel, there is a problem that it is difficult to reduce the occurrence of smear with only the compensation data generated by the screen inspection.

The embodiment is intended to provide a display device for correcting the unevenness of a display panel and a driving method thereof.

The embodiment is intended to provide a display device with improved display quality and a driving method thereof.

A display device according to an embodiment includes a display panel including a plurality of pixels, a first memory for storing a plurality of compensation data generated by using an image of a display panel displaying test images corresponding to a plurality of reference gradations, A second memory for storing a plurality of gain values corresponding to a plurality of reference gradations, and a signal controller for correcting input image data using a plurality of compensation data and a plurality of gain values.

Wherein a plurality of compensation data is generated corresponding to a plurality of reference gradations and one of the plurality of compensation data is displayed when the display panel displays a test image corresponding to one of the plurality of reference gradations at a first drive frequency, And can be generated by calculating luminance distribution data of one image.

One of the plurality of compensation data is generated based on the luminance distribution data, and may include a compensation value corresponding to each of the plurality of pixels.

The display panel can display an image according to the input image data at a second driving frequency higher than the first driving frequency.

The input image data includes a plurality of gradation values corresponding to a plurality of pixels and the signal control section reads the first compensation data and the first gain value corresponding to the reference gradation equal to the gradation value of the first pixel among the plurality of pixels , A correction gradation value for the first pixel can be generated by adding the value obtained by multiplying the first compensation data by the first gain value to the gradation value of the first pixel.

The signal control unit may determine a period in which a gray level value of a second pixel among a plurality of pixels of the input image data is included among a plurality of intervals divided by a plurality of reference gray levels and determine a first reference gray level and a second reference gray level, Third compensation data, a second gain value and a third gain value corresponding to each of the gradations, a value obtained by multiplying the second compensation data by the second gain value, and a third compensation data, Value to generate a final compensation value, and to add a final compensation value to the tone value of the second pixel to generate a correction tone value for the second pixel.

The signal control unit generates corrected image data in which the input image data is corrected using only a plurality of compensation data and the display panel can display the image in accordance with the corrected image data at the first driving frequency.

A display device according to an embodiment includes a display panel including a plurality of pixels, a first display panel that displays a plurality of first compensation data generated using an image of a display panel displaying test images corresponding to a plurality of reference gradations, A second memory for storing second compensation data obtained by multiplying a plurality of compensation data by a plurality of gain values corresponding to a plurality of reference gradations, and a second memory for storing first compensation data and second compensation data, 2 compensating data, and correcting the input video data.

A method of driving a display device according to an embodiment of the present invention includes receiving image data including a plurality of tone values corresponding to a plurality of pixels, receiving at least one compensation data corresponding to a tone value of a first pixel among a plurality of pixels, Reading out one gain value, and correcting the tone value of the first pixel by multiplying at least one of the compensation data and the gain value.

Wherein the step of reading at least one compensation data and at least one gain value comprises the steps of: when the tone value of the first pixel is the same as one of the plurality of reference gradations, For example.

Wherein the step of reading at least one of the compensation data and the gain value comprises the steps of: when the gray level value of the first pixel is included in one of a plurality of intervals divided by a plurality of reference gray levels, And reading the first compensation data, the second compensation data, the first gain value, and the second gain value corresponding to each of the reference gradations.

Wherein the step of correcting the tone value of the first pixel comprises the steps of generating a first compensation value by multiplying the first compensation data by the first gain value and multiplying the second compensation value by the second compensation value, Generating a final compensation value by interpolating the first compensation value and the second compensation value, and adding the final compensation value to the gray level value of the first pixel.

The step of reading at least one compensation data and at least one gain value includes the steps of reading at least one compensation data from a plurality of compensation data generated corresponding to a plurality of reference gradations, And reading at least one gain value from a plurality of gain values generated by the plurality of gain values.

One of the plurality of compensation data may be generated by calculating luminance distribution data of an image of the display panel when the display panel displays a test image corresponding to one of the plurality of reference gradations at a first drive frequency.

One of the plurality of compensation data is generated based on the luminance distribution data, and may include a plurality of compensation values corresponding to the plurality of pixels.

Effects of the display apparatus and the driving method thereof according to the embodiment will be described as follows.

According to at least one of the embodiments, it is possible to display an image with smear correction.

According to at least one of the embodiments, an image with improved display quality can be displayed.

1 is a block diagram showing a screen inspection apparatus of a display panel.
FIG. 2 is a view showing compensation data generated by the screen testing apparatus of FIG. 1. FIG.
3 is a block diagram showing a display device according to the embodiment.
4 is a block diagram specifically showing a signal control unit of the display device according to the first embodiment.
5 is a block diagram specifically showing a signal control unit of the display apparatus according to the second embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can readily implement the embodiments. However, the embodiments may be embodied in various different forms and are not limited to the embodiments described herein.

Also, throughout the specification, when an element is referred to as "including" an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

Although a sequence such as a first, a second, etc. is used to describe the components, these components are not limited by ordinal numbers. These terms are used to distinguish components defined by the same term. Therefore, the first element mentioned in the detailed description of the invention can be distinguished from other ordinals in the claims.

First, the compensation data (CD) generated by screen inspection of the display panel 100 will be described with reference to Figs. 1 and 2. Fig.

1 is a block diagram showing a screen inspection apparatus 200 of the display panel 100. As shown in FIG.

The screen inspection apparatus 200 of the display panel 100 includes a display drive unit 210, an image acquisition unit 220, a brightness calculation unit 230, a compensation data generation unit 240, and a memory 250 ).

The display driver 210 provides the display panel 100 with a test signal TS. The display driver 210 may provide the display panel 100 with test signals TS corresponding to a plurality of predetermined reference gradations. For example, the display driver 210 may sequentially provide the display panel 100 with a test signal TS corresponding to each of a plurality of reference gradations.

The display panel 100 includes a plurality of pixels PX11 to PXmn arranged in a matrix form. Various types of display panels can be used for the display panel 100. FIG.

The display panel 100 displays an image corresponding to one of the plurality of reference gradations in response to the test signal TS. The display panel 100 operates at a first driving frequency and can display an image according to the test signal TS. For example, the first drive frequency may be 60 Hz.

The image acquisition unit 220 can acquire an image of the display panel 100 that displays an image corresponding to the reference gradation. The image acquisition unit 220 may be a camera and may capture an image of the display panel 100 and provide the image data I of the sensed image to the brightness calculation unit 230. [

For example, the image acquisition unit 220 may be a CCD (charge coupled device) camera and may be formed of a plurality of cells. After the display panel 100 and the image capturing unit 220 are aligned, the image capturing unit 220 captures an image of the display panel 100 displaying an image corresponding to the test signal TS. The image of the display panel 100 can be charged as an optical signal to each cell of the image acquisition section 220 and the image acquisition section 220 can convert the optical signal into an electrical signal to generate image data I have.

The luminance calculating unit 230 may calculate the luminance distribution data P for each reference gradation based on the image data I. The brightness calculating unit 230 may take into account the exposure time of the image image, the lens focus characteristics, the boundary surface correction, and the camera noise when calculating the luminance distribution data P based on the image data I. [

The brightness calculating section 230 can calculate the brightness distribution data P corresponding to a plurality of reference gradations. For example, when the brightness distribution data P corresponding to the first reference grayscale is calculated, the brightness calculating unit 230 may determine that the display driver 210 outputs the test signal TS corresponding to the second reference grayscale Can be controlled. When the luminance distribution data P corresponding to the second reference gradation is calculated, the brightness calculating unit 230 can control the display driver 210 to output the test signal TS corresponding to the third reference gradation have.

The compensation data generation unit 240 calculates compensation values corresponding to the pixels based on the luminance distribution data P corresponding to the plurality of reference gradations. The compensation data generation unit 240 generates compensation data CD in the form of a look-up table, and the compensation data CD can be stored in the memory 250. The compensation data (CD) will be described together with reference to Fig.

2 schematically shows compensation data CD1 corresponding to the first reference gradation and compensation data CD2 corresponding to the second reference gradation among the compensation data generated by the screen testing apparatus 200 of FIG. to be.

The compensation data corresponding to the reference gradation can be generated in the same number as the number of reference gradations. For example, when the reference gradation is k, the compensation data can be generated in k corresponding to k reference gradations. Hereinafter, for convenience of explanation, only the compensation data CD1 corresponding to the first reference gradation and the compensation data CD2 corresponding to the second reference gradation will be described.

Each of the compensation data CD1 and CD2 may include a plurality of compensation values corresponding to the plurality of pixels. The compensation data CD1 includes a plurality of compensation values B11 to Bmn corresponding to the plurality of pixels PX11 to PXmn and the compensation data CD2 includes a plurality of compensations corresponding to the plurality of pixels PX11 to PXmn Values C11 to Cmn.

The compensation data generating unit 240 can generate a plurality of compensation values based on the difference between the luminance data of the specific pixel and the luminance data of the remaining pixels in the luminance distribution data P corresponding to each of the plurality of reference gradations.

When the image corresponding to the first reference gradation is displayed on the display panel 100, the compensation data generating unit 240 generates the compensation data based on the difference between the luminance data of the specific pixel and the luminance data of the remaining pixels in the luminance distribution data P , A plurality of compensation values B11 to Bmn can be generated such that the luminance of the remaining pixels falls within the critical range of the luminance of the specific pixel. The critical range is a range including a predetermined margin on the basis of the luminance of a specific pixel, and may be set to a range in which no unevenness is visible to the user.

Further, when an image corresponding to the second reference gradation is displayed on the display panel 100, the compensation data generation unit 240 calculates the difference between the luminance data of the specific pixel and the luminance data of the remaining pixels in the luminance distribution data P A plurality of compensation values C11 to Cmn can be generated so that the luminance of the remaining pixels falls within the threshold range of the luminance of the specific pixel.

 For example, when an image corresponding to the first reference gradation is displayed on the display panel 100, the brightness of the first pixel PX11 may have a higher value than the brightness of the specific pixel. The compensation data generating unit 240 generates the compensation data of the pixel PX11 so that the luminance of the pixel PX11 falls within the critical range of the luminance of the specific pixel based on the difference between the luminance data of the pixel PX11 and the luminance data of the specific pixel. The compensation value B11 can be set to a value that reduces the luminance data.

Alternatively, the luminance of the first pixel PX11 may have a value lower than the luminance of the specific pixel. The data generating unit 240 then generates the data PX11 of the pixel PX11 so that the luminance of the pixel PX11 falls within the critical range of the luminance of the specific pixel based on the difference between the luminance data of the pixel PX11 and the luminance data of the specific pixel The compensation value B11 can be set to a value that increases the data.

A plurality of compensation data CD1 and CD2 may be generated corresponding to a plurality of reference gradations. For example, the compensation data CD1 is generated by measuring the luminance when an image corresponding to the first reference gradation is displayed, and the luminance when the image corresponding to the second reference gradation is displayed is measured to obtain compensation data ( CD2) may be generated.

The compensation values may be gray level values added to the gray level values of the image data input to the display device.

Specifically, if the gray level value of the first pixel PX11 of the video data is the same as any one of the plurality of reference gray levels, the compensation value of the first pixel PX11 in the compensation data corresponding to one reference gray- Can be added to the gray level value of one pixel PX11.

For example, when the gradation value of the first pixel PX11 in the video data is the first reference gradation, the compensation value B11 corresponding to the first pixel PX11 of the compensation data CD1 corresponding to the first reference gradation ) Can be added to the tone value of the first pixel PX11. When the gradation value of the first pixel PX11 in the video data is the second reference gradation, the compensation value C11 corresponding to the first pixel PX11 of the compensation data CD2 corresponding to the second reference gradation is the first And can be added to the tone value of the pixel PX11.

If the gradation value of the first pixel PX11 of the image data is different from the plurality of reference gradations, the compensation value calculated by the interpolation method using the compensation data is added to the gradation value of the first pixel PX11 of the image data . In order to reduce the amount of calculation for calculating the compensation data, a compensation value for the remaining gray levels may be generated through interpolation based on compensation data for the reference gray levels stored in the memory 250 among the entire gray levels.

For example, the gray level value of the first pixel PX11 of the video data may be a value between the first reference gray level and the second reference gray level. Then, the compensation value of the first pixel PX11 is set to the compensation value of the first pixel PX11 of the first compensation data CD1 corresponding to the first reference gray-scale level and the compensation value of the second compensation data CD2 The compensation value of the first pixel PX11 in the linear interpolation method. The calculated compensation value of the first pixel PX11 may be added to the tone value of the first pixel PX11 of the image data.

Since the compensation data CD1 and CD2 are obtained by taking an image displayed by the test signal TS when the display panel 100 displays an image at the first driving frequency, When an image is displayed at a second driving frequency higher than the first driving frequency, there is a problem that it is difficult to prevent the generation of stains only by such compensation data.

Hereinafter, a display apparatus and a driving method thereof for compensating image data when the display panel 100 displays an image at a second driving frequency using the compensation data will be described.

3 is a block diagram showing a display device 10 according to the embodiment. The display device 10 includes a display panel 100, a data driver 110, a gate driver 120, and a signal controller 130.

The display panel 100 includes a plurality of display signal lines and a plurality of pixels PX11 to PXmn connected thereto. The display signal line includes a plurality of gate lines G1 to Gm for transferring gate signals (also referred to as "scan signals") and a plurality of data lines D1 to Dn for transferring data signals. Each of the plurality of pixels PX11 to PXmn may be connected to the gate lines G1 to Gm and the data lines D1 to Dn. The plurality of pixels PX11 to PXmn may include a liquid crystal element or an organic light emitting diode.

The data driver 110 may divide the gradation reference voltage from the gradation voltage generator (not shown) to generate the gradation voltage for the entire gradation or input the plurality of gradation voltages from the gradation voltage generator. The data driver 110 is connected to the data lines D1 to Dn of the display panel 100 and applies a plurality of data voltages to the data lines D1 to Dn.

The data driver 110 receives the video data DATA for one row of pixels in accordance with the data control signal CONT1 and selects the gray scale voltages corresponding to the respective video data DATA from the gray scale voltages, Into a data voltage and applies it to the corresponding data line D1 to Dn.

The gate driver 120 is connected to the gate lines G1 to Gm and applies a gate signal composed of a combination of a gate-on voltage and a gate-off voltage to the gate lines G1 to Gm.

The gate driver 120 applies a gate-on voltage to the gate lines G1 to Gm in accordance with the gate control signal CONT2 from the signal controller 130. [ Then, the data voltages applied to the data lines D1 to Dn may be applied to the corresponding pixels.

Although not shown, a backlight unit may be disposed behind the display panel 100 and may include at least one light source. Examples of the light source include a fluorescent lamp such as a cold cathode fluorescent lamp (CCFL), a light emitting diode (LED), and the like.

The signal controller 130 controls operations of the gate driver 120, the data driver 110, and the like.

The signal controller 130 receives input image data IS and an input control signal CTRL from outside. The input image data IS contains luminance information of each pixel of the display panel 100. The luminance may be divided into a predetermined number of, for example, 1024, 256, or 64 gray levels. The input control signal CTRL may include a vertical synchronization signal, a horizontal synchronization signal, a main clock, a data enable signal, and the like in association with the image display.

The signal controller 130 appropriately processes the input image data IS according to the operation conditions of the display panel 100 based on the input image data IS and the input control signal CTRL and outputs the data control signals CONT1 and / The gate control signal CONT2, and the like. The frequency of the data control signal CONT1 and the gate control signal CONT2 can be determined according to the driving frequency. For example, the frequencies of the data control signal CONT1 and the gate control signal CONT2 are synchronized with the first drive frequency in accordance with the input control signal CTRL indicating the first drive frequency, And may be a frequency synchronized with the second drive frequency in accordance with the input control signal CTRL indicating.

The input image data IS input from the outside may be image data representing a two-dimensional image or image data representing a three-dimensional image.

The two-dimensional image data may include a plurality of tone values corresponding to the plurality of pixels PX11 to PXmn in units of one frame. The three-dimensional image data may include left eye image data and right eye image data arranged in units of two consecutive sub-frames included in one frame.

The left eye image data includes a plurality of tone values corresponding to the plurality of pixels PX11 to PXmn, and the right eye image data also includes a plurality of tone values corresponding to the plurality of pixels PX11 to PXmn.

The signal controller 130 may include a first memory 132, a second memory 134, and a data processor 136. In the first memory 132, the compensation data may be stored in the form of a look-up table. The compensation data includes data on a plurality of compensation values generated in the screen testing apparatus 200 of the display panel 100 of FIGS. 1 and 2 described above. Hereinafter, the compensation data refers to data including a plurality of compensation values corresponding to each of a plurality of reference gradations separately in one screen unit.

The data processing unit 136 can correct the input image data IS and output the image data DATA. At this time, correction can be performed on the entire gradation of the input image data IS. For example, the input image data IS can be corrected from the minimum gradation (0 gradation) to the maximum gradation (255 gradation).

When the display panel 100 displays an image at the first driving frequency, the data processing unit 136 receives the input image data IS and can read the compensation data from the first memory 132. [ The data processing unit 136 can generate the corrected image data DATA by correcting the input image data IS using the compensation data and output the corrected image data DATA to the data driver 110 .

The data processing unit 136 receives the input image data IS when the display panel 100 displays an image at the second driving frequency and receives the compensation data read from the first memory 132 and the compensation data read from the second memory 134 , It is possible to correct the input image data IS. The data processor 136 may generate corrected image data (DATA) obtained by correcting the input image data IS and output the generated corrected image data to the data driver 110. The operation of the data processing unit 136 will be described later with reference to FIGS. 4 and 5. FIG.

Next, the signal controller 130 outputs the gate control signal CONT2 to the gate driver 120, and outputs the data control signal CONT1 and the processed corrected video data DATA to the data driver 110 have.

The data control signal CONT1 includes a horizontal synchronization start signal, a clock signal, and a line latch signal. The gate control signal CONT2 may include a vertical synchronization start signal, an output enable signal, and a gate pulse signal.

The gate driving unit 120 applies a voltage to all the gate lines G1 to Gm in units of one horizontal period (also referred to as "1H ", which is equal to one period of the horizontal synchronizing signal and the data enable signal) based on the gate control signal CONT2 On voltage and the data driver 110 applies a plurality of data voltages to all the pixels PX11 to PXmn in synchronization with the application timing of the gate-on voltage based on the data control signal CONT1. One horizontal period may be determined according to the first driving frequency or the second driving frequency of the display panel 100. [

The signal controller 130 may output a shutter control signal CONT3, which is a radio signal for controlling the left and right eye shutters of the shutter glasses 140 to implement a three-dimensional image. The shutter glasses 140 open and close the left and right eye shutters in response to the shutter control signal CONT3 from the signal controller 130. [

The signal control unit 130 may include a wireless transmission unit for transmitting the shutter control signal CONT3 wirelessly and the shutter glasses 140 may include a wireless reception unit (not shown) for receiving the shutter control signal CONT3 Not shown).

While the left eye image is displayed on the display panel 100, the left eye shutter of the shutter eyeglasses 140 is opened and the right eye shutter is closed. While the right eye image is displayed on the display panel 100, the left eye shutter of the shutter eyeglasses 140 is closed and the right eye shutter is opened. Therefore, the left eye image is recognized in the left eye of the user wearing the shutter glasses 140, and the right eye image is recognized in the right eye, so that the user can appreciate the three-dimensional image.

Next, the signal controller 130 for correcting the image data according to the first embodiment will be described with reference to FIG.

4 is a block diagram specifically showing the signal control unit 130 of the display device 10 according to the first embodiment. As shown in the figure, the signal controller 130 includes a first memory 132, a second memory 134, and a data processor 136. The data processor 136 corrects the input image data IS, (DATA), and outputs the corrected video data (DATA) to the data driver (110).

The first memory 132 stores a plurality of compensation data CD1 to CDk generated corresponding to a plurality of reference gradations. As described with reference to FIGS. 1 and 2, when the display panel 100 displays an image at the first driving frequency, a plurality of compensation data CD1 to CDk are generated by capturing an image displayed by the test signal TS .

The second memory 134 stores a plurality of gain values corresponding to a plurality of reference gradations. At this time, the plurality of gain values are calculated using the compensation data generated when the display panel 100 is driven with the first drive frequency and the compensation data generated when the display panel 100 is driven with the second drive frequency .

For example, the gain value corresponding to the first reference gradation is calculated by using the compensation data corresponding to the first reference gradation generated by the display panel 100 driven by the first driving frequency by the screen inspecting apparatus 200 of FIG. 1 And the compensation data corresponding to the first reference gradation generated by driving the display panel 100 at the second driving frequency.

Specifically, when an image corresponding to the first reference gradation is displayed on the display panel 100 operating at the first driving frequency, the screen inspecting apparatus 200 calculates the compensation values of the plurality of pixels. When the image corresponding to the first reference gradation is displayed on the display panel 100 operating at the second driving frequency, the screen inspecting apparatus 200 calculates the compensation values of the plurality of pixels. The screen inspection apparatus 200 calculates ratios of a first driving frequency compensation value and a second driving frequency compensation value of a plurality of pixels. Then, the gain value corresponding to the first reference gradation can be calculated as an average value of the calculated ratios.

The data processing unit 136 can read the plurality of compensation data CD1 to CDk from the first memory 132 when the two-dimensional image data IS having the first driving frequency is input. The data processing unit 136 may add the compensation value obtained using the plurality of compensation data CD1 to CDk to a plurality of gray-scale values included in the two-dimensional image data IS.

For example, if the tone value of the first pixel of the two-dimensional image data IS is equal to any one of the plurality of reference gradations, the data processing unit 136 may calculate the compensation value of the first pixel Value to the gray-scale value of the first pixel of the two-dimensional image data IS.

The data processor 136 generates the compensation value using the interpolation method according to the gray level of the two-dimensional image data IS, and outputs the generated compensation value to the plurality of gray level values included in the two- Can be added.

For example, the tone value of the first pixel of the two-dimensional image data IS may be a value between the first reference tone and the second reference tone. The data processing unit 136 uses the compensation value of the first pixel in the compensation data corresponding to the first reference gradation and the compensation value of the first pixel in the compensation data corresponding to the first reference gradation, Can be generated. Then, the data processor 136 may add the compensation value of the generated first pixel to the gray-scale value of the first pixel of the two-dimensional image data IS.

The data processor 136 reads out a plurality of compensation data CD1 to CDk from the first memory 132 and outputs the compensation data CD1 to CDk from the second memory 134 when the three- Gain values can be read out. The data processing unit 136 may sum up the compensation value obtained using the plurality of compensation data CD1 to CDk and the gain values with a plurality of gray-scale values included in the three-dimensional image data IS. At this time, the data processing unit 136 may generate the compensation value using an interpolation method.

For example, the data processing unit 136 separates the three-dimensional image data IS into left eye image data and right eye image data. It is assumed that the gray level value of the first pixel of the left eye image data is the first reference gray level and the gray level value of the first pixel of the right eye image data is the second reference gray level. The data processing unit 136 reads the first compensation value corresponding to the first reference gradation for the first pixel from the first memory 132 and the gain corresponding to the first reference gradation from the second memory 134 Read. The data processing unit 136 calculates the final compensation value of the first pixel by multiplying the first compensation value by the gain value. The data processing unit 136 may add the final compensation value of the first pixel to the gray level value of the first pixel of the left eye image data. The data processing section 136 reads the second compensation value corresponding to the second reference gradation relating to the first pixel from the first memory 132 and outputs the gain value corresponding to the second reference gradation to the second memory 134 . The data processing unit 136 calculates the final compensation value of the first pixel by multiplying the second compensation value by the gain value. The data processing unit 136 may generate the correction tone value by adding the final compensation value of the first pixel to the tone value of the first pixel of the right eye image data.

For example, the data processing unit 136 separates the three-dimensional image data IS into left eye image data and right eye image data. The gray level value of the second pixel of the left eye image data may be a value between the first reference gray level and the second reference gray level. The data processing unit 136 reads the third compensation value corresponding to the first reference gradation for the second pixel from the first memory 132 and outputs the gain value corresponding to the first reference gradation from the second memory 134 Read. The data processor 136 reads the fourth compensation value corresponding to the second reference gradation from the first memory 132 and reads the gain value corresponding to the second reference gradation from the second memory 134. [ The data processor 136 generates a final compensation value by interpolating a value obtained by multiplying a gain value corresponding to the third compensation value and a gain value corresponding to the fourth compensation value. The data processing unit 136 may generate the correction tone value for the second pixel by adding the final compensation value to the tone value of the second pixel.

When the display panel 100 displays an image at a second driving frequency higher than the first driving frequency, the signal controller 130 controls the compensation data stored in the first memory 132 and the gain data stored in the second memory 134 Can be used to compensate the input image data IS. Therefore, the display device 10 and the driving method thereof according to the embodiment have the effect of preventing the occurrence of stains on the display panel 100 even when displaying a three-dimensional image.

Next, the signal controller 130 for correcting the video data according to the second embodiment will be described with reference to FIG.

5 is a block diagram specifically showing the signal controller 130 of the display device according to the second embodiment. As shown in the figure, the signal controller 130 includes a first memory 133, a second memory 135, and a data processor 137. The data processor 137 corrects the input image data IS, Generates the image data (DATA '), and outputs the corrected image data (DATA') to the data driver (110).

The first memory 133 stores a plurality of first compensation data CD11 to CD1k generated corresponding to a plurality of reference gradations when the display panel 100 displays an image at a first driving frequency.

The second memory 135 stores a plurality of second compensation data CD21 to CD2k multiplied by a plurality of gain values for the plurality of first compensation data CD11 to CD1k. 4, the plurality of gain values include compensation data generated when the display panel 100 is driven with the first driving frequency and compensation data generated when the display panel 100 is driven with the second driving frequency , And the same or similar explanations are omitted.

The data processing unit 137 can read the first compensation data CD11 to CD1k from the first memory 133 when the two-dimensional image data IS having the first driving frequency is input. The data processing unit 137 may add the compensation value obtained using the plurality of first compensation data CD11 to CD1k to the plurality of gray-scale values included in the two-dimensional image data IS.

For example, if the tone value of the first pixel of the two-dimensional image data IS is the same as any one of the plurality of reference gradations, the data processing unit 137 may determine that the first pixel Can be added to the tone value of the first pixel of the two-dimensional image data (IS).

The data processor 137 generates the compensation value using the interpolation method according to the gray level of the two-dimensional image data IS and outputs the generated compensation value to a plurality of gray level values included in the two- Can be added.

For example, the tone value of the first pixel of the two-dimensional image data IS may be a value between the first reference tone and the second reference tone. The data processing unit 137 uses the compensation value of the first pixel of the first compensation data corresponding to the first reference gradation and the compensation value of the first pixel of the first compensation data corresponding to the first reference gradation, The compensation value of the pixel can be generated. The data processing unit 137 may add the generated compensation value of the first pixel to the gray-scale value of the first pixel of the two-dimensional image data IS.

The data processing unit 137 can read the second compensation data CD21 to CD2k from the second memory 135 when the three-dimensional image data IS having the second driving frequency is input. The data processing unit 137 may add the compensation value obtained using the plurality of second compensation data CD21 to CD2k to a plurality of gray-scale values included in the three-dimensional image data IS.

For example, the data processing unit 137 separates the three-dimensional image data IS into left eye image data and right eye image data. It is assumed that the gray level value of the first pixel of the left eye image data is the first reference gray level and the gray level value of the first pixel of the right eye image data is the second reference gray level. The data processing unit 137 reads the compensation value of the first pixel of the second compensation data corresponding to the first reference gradation from the second memory 135. [ The data processing unit 137 may add the compensation value of the first pixel to the tone value of the first pixel of the left eye image data. Then, the data processing unit 137 reads the compensation value of the first pixel of the second compensation data corresponding to the second reference gradation from the second memory 135. The data processing unit 137 may add the compensation value of the first pixel to the gray level value of the first pixel of the right eye image data.

When the display panel 100 displays an image at a second driving frequency higher than the first driving frequency, the signal processing unit uses the second compensation data CD21 to CD2k stored in the second memory 135, The data IS can be compensated. Therefore, the display device and the driving method thereof according to the embodiment have the effect of preventing the occurrence of stain on the display panel 100 even when a three-dimensional image is displayed.

Although the preferred embodiments of the present invention have been described in detail, the scope of the present invention is not limited thereto. Various modifications and improvements of the skilled person in the art using the basic concepts of the embodiments defined in the following claims It belongs.

10: Display device
100: display panel
110: Data driver
120: Gate driver
130:

Claims (15)

A display panel including a plurality of pixels,
A first memory that stores a plurality of compensation data generated by using an image of the display panel that displays test images corresponding to a plurality of reference gradations,
A second memory for storing a plurality of gain values corresponding to the plurality of reference gradations,
A signal controller for correcting input image data using the plurality of compensation data and the plurality of gain values,
. The method according to claim 1,
Wherein the plurality of compensation data are generated corresponding to the plurality of reference gradations,
Wherein one of the plurality of compensation data is generated by calculating luminance distribution data of an image taken of the display panel when the display panel displays a test image corresponding to one of the plurality of reference gradations at a first drive frequency Display device. 3. The method of claim 2,
Wherein one of the plurality of compensation data is generated based on the luminance distribution data and includes a compensation value corresponding to each of the plurality of pixels. The method according to claim 1,
Wherein the display panel displays an image according to the input image data at a second driving frequency higher than the first driving frequency. 5. The method of claim 4,
Wherein the input image data includes a plurality of tone values corresponding to the plurality of pixels,
Wherein the signal control unit reads the first compensation data and the first gain value corresponding to the same reference gradation as the gray scale value of the first pixel among the plurality of pixels and outputs the first compensation data and the first gain value, which are obtained by multiplying the first compensation data by the first gain value Is added to the tone value of the first pixel to generate the correction tone value for the first pixel. 6. The method of claim 5,
Wherein the signal controller determines a section including a gray level value of a second pixel among the plurality of pixels of the input image data among a plurality of sections divided by the plurality of reference gradations, Second compensating data, third compensating data, second compensating data, second compensating data, third compensating data, and second compensating data corresponding to the gradation and the second reference gradation, respectively, and a value obtained by multiplying the second compensating data by the second gain, Wherein the correction value generating unit generates a correction value by interpolating a value obtained by multiplying the third compensation data by the third gain value and generates a final compensation value by adding the final compensation value to the tone value of the second pixel, / RTI > The method according to claim 1,
Wherein the signal control unit generates corrected image data obtained by correcting the input image data using only the plurality of compensation data,
Wherein the display panel displays an image according to the corrected image data at the first driving frequency. A display panel including a plurality of pixels,
A first memory for storing a plurality of first compensation data generated by using an image of the display panel displaying test images corresponding to a plurality of reference gradations,
A second memory for storing second compensation data obtained by multiplying the plurality of compensation data by a plurality of gain values corresponding to the plurality of reference gradations,
A signal controller for selectively reading the first compensation data and the second compensation data according to a driving frequency corresponding to input video data to correct the input video data,
. Receiving image data including a plurality of tone values corresponding to a plurality of pixels,
Reading at least one compensation value and at least one gain value corresponding to the gray level value of the first pixel among the plurality of pixels, and
Multiplying the at least one compensation data and the gain value to correct the tone value of the first pixel,
And a driving method of the display device. 10. The method of claim 9,
Wherein the reading of the at least one compensation data and the at least one gain value comprises:
And reading the compensation data and the gain value corresponding to the one reference gradation if the gradation value of the first pixel is the same as one reference gradation of the plurality of reference gradations. 10. The method of claim 9,
Wherein the reading of the at least one compensation data and the gain value comprises:
When the gradation value of the first pixel is included in one of a plurality of intervals classified by a plurality of reference gradations, first compensation data corresponding to each of a first reference gradation and a second reference gradation for distinguishing the section, Reading the compensation data, the first gain value and the second gain value
And a driving method of the display device. 12. The method of claim 11,
Wherein the step of correcting the tone value of the first pixel comprises:
Multiplying the first compensation data by the first gain value to generate a first compensation value,
Multiplying the second compensation data by the second gain value to generate a second compensation value,
Interpolating the first compensation value and the second compensation value to generate a final compensation value, and
Summing the final compensation value to the tone value of the first pixel
And a driving method of the display device. 10. The method of claim 9,
Wherein the reading of the at least one compensation data and the at least one gain value comprises:
Reading the at least one compensation data from a plurality of compensation data generated corresponding to a plurality of reference gradations, and
Reading the at least one gain value from a plurality of gain values generated corresponding to the plurality of reference gradations,
And a driving method of the display device. 14. The method of claim 13,
Wherein one of the plurality of compensation data is a display that is generated by calculating luminance distribution data of an image taken of the display panel when the display panel displays a test image corresponding to one of the plurality of reference gradations at a first drive frequency A method of driving a device. 15. The method of claim 14,
Wherein one of the plurality of compensation data is generated based on the luminance distribution data and includes a plurality of compensation values corresponding to the plurality of pixels.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020096202A1 (en) * 2018-11-08 2020-05-14 Samsung Electronics Co., Ltd. Display apparatus and control method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020096202A1 (en) * 2018-11-08 2020-05-14 Samsung Electronics Co., Ltd. Display apparatus and control method thereof
US10957238B2 (en) 2018-11-08 2021-03-23 Samsung Electronics Co., Ltd. Display apparatus and control method thereof

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