CN109658900B - Driving method, compensation circuit and driving device of display panel and display device - Google Patents
Driving method, compensation circuit and driving device of display panel and display device Download PDFInfo
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- CN109658900B CN109658900B CN201910153427.8A CN201910153427A CN109658900B CN 109658900 B CN109658900 B CN 109658900B CN 201910153427 A CN201910153427 A CN 201910153427A CN 109658900 B CN109658900 B CN 109658900B
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3607—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 by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The embodiment of the invention provides a driving method, a compensation circuit, a driving device and a display device of a display panel. Since the method can output the data signal generated based on the compensation gray scale corresponding to the initial gray scale to the pixel in at least one of the first display region and the second display region. Therefore, the absolute value of the luminance difference value of the two display regions can be made smaller than or equal to the difference threshold value, i.e., the difference in display luminance of the two display regions is made small. The display panel has good display uniformity.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a driving method, a compensation circuit, a driving device, and a display device for a display panel.
Background
Liquid Crystal Display (LCD) panels are widely used in the display field, for example, in the Virtual Reality (VR) field, due to their advantages of high resolution, light weight, low power consumption, and low radiation. With the development of display technology, on the premise that a high requirement is placed on the display effect of the human eye watching region in the display panel, a high requirement is placed on the refresh rate of the display panel.
In the related art, the refresh rate of the display panel is increased on the premise of ensuring the display effect of the human eye watching region. The gate driving circuit can control pixels included in a predetermined human eye watching area in the display panel to be turned on line by line, and control pixels included in an area except the human eye watching area in the display panel to be turned on in multiple rows at the same time. Therefore, on the premise of ensuring the display effect of the human eye watching area, the scanning time of each frame of picture is reduced, and the refresh rate of the display panel is improved.
However, in the above driving method, the source driver circuit outputs the data signals to the pixels included in the eye region one by one and simultaneously outputs the data signals to the plurality of pixels included in the regions other than the eye region during the scanning of the gate driver circuit, and thus the data voltage charged to each pixel of the eye region may be different from the data voltage charged to each pixel of the regions other than the eye region within the same time, and the display luminance of the eye region may be different from that of the regions other than the eye region, resulting in a poor display uniformity of the display panel.
Disclosure of Invention
The invention provides a driving method, a compensation circuit, a driving device and a display device of a display panel, which can solve the problem of poor display uniformity of the display panel in the related technology, and the technical scheme is as follows:
in one aspect, a driving method of a display panel is provided, and optionally, the method includes:
determining a first display area and a second display area, wherein a plurality of rows of pixels included in the first display area are started line by line, and at least two rows of pixels in the plurality of rows of pixels included in the second display area are started simultaneously;
outputting a first data signal to the pixels of the first display area according to a first initial gray scale of the pixels in the first display area;
outputting a second data signal to the pixels of the second display area according to a second initial gray scale of the pixels in the second display area;
wherein at least one of the first data signal and the second data signal is generated based on a compensation gray scale corresponding to an initial gray scale of a pixel to be output, and an absolute value of a luminance difference between the luminance of the first display region and the luminance of the second display region is made smaller than or equal to a difference threshold based on the data signal generated based on the compensation gray scale.
Optionally, the first display area is a human eye gazing area determined according to a gazing point of human eyes on the display panel, and the second display area is an area other than the human eye gazing area.
Optionally, the first display area is an area for displaying a first resolution image set on the display panel, the second display area is an area for displaying a second resolution image set on the display panel, and the first resolution is greater than the second resolution.
Optionally, the first data signal is generated based on the first initial gray scale;
the second data signal is generated based on a second compensation gray scale corresponding to the second initial gray scale.
Optionally, the compensation gray scale corresponding to the initial gray scale is determined according to a corresponding relationship between the initial gray scale and the compensation gray scale, and before the first data signal is output to the pixel of the first display region, the method further includes:
determining a first test area and a second test area, wherein a plurality of rows of pixels included in the first test area are started line by line, and at least two rows of pixels in the plurality of rows of pixels included in the second test area are started simultaneously;
outputting a third data signal generated based on a third initial gray scale to both the pixels of the first test area and the pixels of the second test area;
when detecting that the absolute value of the brightness difference between the brightness of the first test area and the brightness of the second test area is greater than the difference threshold, adjusting a third initial gray scale of the pixel in a target test area, and updating a corresponding data signal based on the adjusted third initial gray scale until the absolute value of the brightness difference between the brightness of the first test area and the brightness of the second test area is less than or equal to the difference threshold, wherein the target test area is at least one of the first test area and the second test area;
and taking the adjusted third initial gray scale as a third compensation gray scale corresponding to the third initial gray scale, and generating a corresponding relation between the initial gray scale and the compensation gray scale according to the third initial gray scale and the third compensation gray scale.
Optionally, the adjusting the third initial gray scale of the pixels in the target test area includes:
when the display brightness of the first test area is detected to be larger than that of the second test area, increasing a third initial gray scale of the pixels in the second test area;
and when the display brightness of the first test area is detected to be smaller than that of the second test area, reducing the third initial gray scale of the pixels in the second test area.
Optionally, the difference threshold is 0.
In another aspect, a compensation circuit of a display panel is provided, the compensation circuit is configured to:
determining a first display area and a second display area, wherein a plurality of rows of pixels included in the first display area are started line by line, and at least two rows of pixels in the plurality of rows of pixels included in the second display area are started simultaneously;
outputting a first data signal to the pixels of the first display area according to a first initial gray scale of the pixels in the first display area;
outputting a second data signal to the pixels of the second display area according to a second initial gray scale of the pixels in the second display area;
at least one of the first data signal and the second data signal is generated based on a compensation gray scale corresponding to an initial gray scale of a pixel to be output, and an absolute value of a luminance difference between the luminance of the first display region and the luminance of the second display region is smaller than or equal to a difference threshold based on the data signal generated based on the compensation gray scale.
In still another aspect, there is provided a driving apparatus of a display panel, the driving apparatus including: a processor and a memory and a computer program stored on the memory, the processor implementing the method of driving the display panel as described in the above aspect when executing the computer program; the compensation circuit of the display panel is integrated in the driving device of the display panel.
In still another aspect, there is provided a display device including: a compensation circuit as described in the above aspect or a drive device as described in the above aspect.
The technical scheme provided by the invention has the beneficial effects that at least:
the embodiment of the invention provides a driving method, a compensation circuit, a driving device and a display device of a display panel. Since the method can output the data signal generated based on the compensation gray scale corresponding to the initial gray scale to the pixel in at least one of the first display region and the second display region. Therefore, the absolute value of the luminance difference value of the two display regions can be made smaller than or equal to the difference threshold value, i.e., the difference in display luminance of the two display regions is made small. The display panel has good display uniformity.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a timing diagram of signal terminals in a driving apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating pixel charging of a human eye gaze region according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating pixel charging of a non-human eye region according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of data signals of a human eye gazing region and a non-human eye gazing region provided by an embodiment of the invention;
FIG. 5 is a diagram illustrating data signals written into capacitors with different capacitance values at the same time according to an embodiment of the present invention;
fig. 6 is a flowchart of a driving method of a display panel according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of data signals for another human eye gaze region and a non-human eye gaze region provided by embodiments of the present invention;
fig. 8 is a flowchart of another driving method of a display panel according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment of the invention provides a driving device of a display panel, which can track the movement of human eyes by adopting an eye-tracking technology to determine the fixation point of the human eyes on the display panel and further determine the fixation area of the human eyes. In addition, the driving device can also control the pixels included in the human eye watching area to be turned on line by line and control the pixels included in the areas except the human eye watching area to be turned on in multiple lines simultaneously, so that the refresh rate is improved. Alternatively, the driving device may include a Display Driver Integrated Circuit (DDIC), and the DDIC may include a source driving circuit and a gate driving circuit.
For example, the gate driving circuit in the DDIC may control pixels included in a region other than the human eye watching region to be simultaneously turned on every four rows. Accordingly, referring to fig. 1, the DDIC may include four gate driving circuits, each of which may be connected with one turn-on signal terminal, i.e., the driving device may include four turn-on signal terminals (STVL1, STVR1, STVL2, and STVR 2). Each gate driving circuit may be connected to two clock signal terminals, and each gate driving circuit may provide a gate driving signal to the pixel under the driving of the turn-on signal terminal and the clock signal terminal. Referring to fig. 1, when the pixels in the eye watching region L1 are driven, each clock signal terminal may sequentially output a clock signal at an effective potential, and the gate driving circuit may output the clock signal at the effective potential (i.e., the gate driving signal) to the pixels included in the eye watching region L1 line by line, so as to drive the pixels included in the eye watching region L1 to be turned on line by line. When the region except the human eye watching region L1 is driven to work, every four clock signal terminals can simultaneously output clock signals at effective potential, and further, the gate driving circuit can simultaneously output clock signals at effective potential to the pixels included in the region except the human eye watching region L1 every four rows of pixels, that is, four rows of pixels included in the region except the human eye watching region L1 are driven to be simultaneously turned on.
Alternatively, referring to fig. 2, a source driving circuit (not shown in fig. 2) in the DDIC may be connected to each column of pixels in the display panel through a source buffer 01, respectively. As shown in fig. 2, each pixel 02 may include: a thin film transistor M1, a pixel electrode (not shown in fig. 2) connected to the thin film transistor M1, a common electrode Vcom, and liquid crystal molecules positioned between the pixel electrode and the common electrode. Referring to fig. 2, the pixel electrode and the common electrode Vcom can be equivalent to a liquid crystal capacitor C1, and a storage capacitor C2 can be formed between the pixel electrode and the common electrode Vcom.
The gate electrode of the thin film transistor M1 may be connected to the gate line G1, and the first electrode may be connected to the data line D1. The equivalent resistance of the trace between the data line D1 and the first electrode of the tft M1 may be R1, and a capacitor C3 may be formed between the trace and the common electrode. The second pole of the thin film transistor M1 may be connected to the pixel electrode. The source driving circuit in the DDIC may be connected to the data line D1 through the source buffer 01, and the gate driving circuit in the DDIC may be connected to the gate line G1. When the gate driving circuit outputs a gate signal at an effective potential to the gate line G1, the source driving circuit can output a data signal to the pixel electrode through the data line D1, thereby driving the liquid crystal molecules to deflect and the pixel to emit light.
For the human eye watching region, when the pixels included in the human eye watching region are controlled to be turned on row by the gate driving circuit in the DDIC, referring to fig. 2, the source driving circuit in the DDIC may output data signals to a column of pixels to which the data lines are connected one by one through the data lines D1. And for the region other than the human eye watching region, when controlling the region other than the human eye watching region to be simultaneously turned on every four rows of pixels (for example, four rows of pixels connected to the gate lines G1, G2, G3, and G4, respectively, shown in fig. 3). Referring to fig. 3, the source driving circuit in the DDIC simultaneously outputs data signals every four pixels in a column of pixels to which the data line is connected through the data line D1.
Referring to fig. 4, when the amplitude of the data signal output from the source driver circuit in the DDIC to the pixels in the same column in the two regions is the same, it can be known from the principle that the capacitance value of the capacitor in parallel increases that the voltage of the data signal written by the source driver circuit in the DDIC to each pixel in the same column in the two regions is different in the same time. And the larger the capacitance value is, the smaller the voltage of the data signal written into the pixel in the same time is, and correspondingly, the smaller the light emitting brightness of the pixel is. This causes the display luminance to be different between the human eye gaze region and the region other than the human eye gaze region.
For example, referring to fig. 5, which shows a voltage diagram of data signals output to two capacitors C10 and C20 with different capacitance values when the amplitude of the data signals output to the pixels in the same column by the source driving circuit in the DDIC is the same, the abscissa represents the time T, and the ordinate represents the voltage value U of the data signals. Referring to fig. 5, it can be seen that, if the amplitudes of the data signals written to the pixels located in the same row and in different areas are the same, the voltage U2 of the data signal written to the capacitor C10 with a larger capacitance value is smaller than the voltage U1 of the data signal written to the capacitor C20 with a larger capacitance value in the same time t 1.
The embodiment of the invention provides a driving method of a display panel, which can be applied to a driving device of the display panel, wherein the driving device can adjust the amplitude of a data signal output to a pixel by adjusting gray scale, namely adjust the voltage of the data signal, and can solve the problem that the display brightness of a human eye watching region and a region except the human eye watching region is different.
Fig. 6 is a flowchart of a driving method of a display panel according to an embodiment of the present invention. As shown in fig. 6, the method may include:
The pixels in the rows of the first display area can be turned on row by row, and the pixels in at least two rows of the pixels in the rows of the second display area are turned on simultaneously.
In the embodiment of the present invention, for each frame of image to be displayed on the display panel, the driving device may obtain the first initial gray scale of each pixel in the first display area when the image is displayed. Further, the driving device may generate a first data signal according to the acquired first initial gray scale, and output the first data signal to a corresponding pixel in the first display area in the process that the pixels in the first display area in the display panel are turned on line by line, so as to drive the pixel to emit light.
Similarly, for each frame of image to be displayed on the display panel, the driving device may also obtain a second initial gray scale of each pixel in the second display area when the image is displayed. Further, the driving device may also generate a second data signal according to the obtained second initial gray scale, and output the second data signal to a corresponding pixel in a second display region in the display panel during the pixel start-up process of the second display region, so as to drive the pixel to emit light.
In the embodiment of the present invention, at least one of the first data signal and the second data signal may be generated by the driving device based on a compensation gray scale corresponding to an initial gray scale of the pixel output by the driving device. That is, at least one of the first data signal and the second data signal may be generated according to the compensation gray scale after the driving device determines the initial gray scale of the pixel and then determines the corresponding compensation gray scale. Also, the data signal generated based on the compensation gray scale may make an absolute value of a luminance difference value between the luminance of the first display region and the luminance of the second display region smaller than or equal to a difference threshold value.
For example, assuming that the driving device determines that the display luminance of the second display region is smaller than that of the first display region, the driving device may increase the voltage of the data signal written to the pixel in the second display region by increasing the second initial gray scale. So that the voltage difference of the data signals written to the pixels of two display areas and located in the same column is smaller or even the same at the same time.
For example, fig. 7 is a schematic diagram of a second data signal generated according to a second compensation gray level corresponding to a second initial gray level according to an embodiment of the present invention. As can be seen from comparing fig. 4 and fig. 7, in the embodiment of the present invention, the driving device outputs the second data signal to the second display region according to the adjusted second compensation gray scale, and the amplitude of the second data signal is greater than the amplitude of the first data signal to the first display region. And further, the voltages of the data signals written into the pixels in the two display areas can be the same in the same time, and the uniformity of the display brightness of the two display areas is ensured.
In summary, the embodiments of the present invention provide a driving method of a display panel. Since the method can output the data signal generated based on the compensation gray scale corresponding to the initial gray scale to the pixel in at least one of the first display region and the second display region. Therefore, the absolute value of the luminance difference value of the two display regions can be made smaller than or equal to the difference threshold value, i.e., the difference in display luminance of the two display regions is made small. The display panel has good display uniformity.
As an alternative implementation, the first display region may be a human eye gaze region determined according to a gaze point of a human eye on the display panel, and the second display region may be a region other than the human eye gaze region.
That is, in the embodiment of the present invention, the driving apparatus may detect the gaze point of the human eye in the display panel in real time through eye-tracking technology, and may determine, as the first display region (i.e., the human eye gaze region), a region where the predetermined number of rows of pixels including the gaze point are located, as the first display region according to the determined gaze point, and may determine a region other than the first display region as the second display region (i.e., a region other than the human eye gaze region). Wherein, the preset number of lines can be preset in the driving device.
For example, assuming that the preset number of lines is 301 lines, the driving apparatus may determine, after determining the gaze point of the human eye by eye-tracking technology, an area where any 301 lines of pixels including the gaze point of the human eye are located as the first display area, for example, the area where the pixel corresponding to the determined gaze point is located and the areas where the upper and lower 150 lines of pixels adjacent to the pixel corresponding to the gaze point are located may be determined as the first display area. Accordingly, the driving device can determine the area where the pixels except for the 301 rows of pixels are located as the second display area. Since the fixation point of human eyes on the display panel may be changed continuously, the eye-tracking technology is used to determine the human eye fixation area and the non-human eye fixation area in the display panel in real time, so that the flexibility and reliability of determining the human eye fixation area can be improved.
As another alternative implementation manner, the first display region may be a region preset on the display panel for displaying the first resolution image, and the second display region may be a region preset on the display panel for displaying the second resolution image. And the first resolution may be greater than the second resolution. That is, the first display area and the second display area may be both fixed areas preset on the display panel.
The gate driving circuit in the DDIC can control the pixels included in the first display region to be turned on row by row, and can control the pixels included in the second display region to be turned on in multiple rows at the same time. The first display region therefore displays an image with a higher resolution and the second display region displays an image with a lower resolution.
For example, assuming that the display panel includes 1600 rows of pixels, the area where the 500 th row of pixels to the 1000 th row of pixels are located may be the first display area. The area where the pixels in the 1 st row to the 499 th row and the pixels in the 1001 st row to the 1600 th row are located may be the second display area.
Alternatively, the first data signal may be generated based on the first initial gray level. The second data signal may be generated based on a second compensation gray scale corresponding to the second initial gray scale.
That is, for the first display region, the driving device may directly generate the corresponding first data signal based on the acquired first initial gray scale of each pixel in the first display region, and output the generated first data signal to the corresponding pixel in the pixel start-up process of the first display region in the display panel. For the second display area, the driving device may determine a second compensation gray scale corresponding to a second initial gray scale after obtaining the second initial gray scale of each pixel in the second display area, then generate a corresponding second data signal based on the second compensation gray scale, and finally output the generated second data signal to the corresponding pixel in a pixel starting process of the second display area in the display panel. That is, the driving device may adjust only the display luminance of the second display region to be close to the luminance of the first display region.
By outputting the compensated second data signal to the second display region only based on the second compensation gray scale corresponding to the second initial gray scale, the display uniformity of the display panel can be improved on the premise of ensuring that the brightness of the first display region (namely the human eye watching region) is unchanged and the display effect of the human eye watching region is ensured. In addition, since the driving apparatus adjusts only the second initial gray scale for generating the second data signal, the amount of calculation of the driving apparatus is also reduced, and the power consumption of the driving apparatus is reduced.
Optionally, the first data signal may be generated based on a first compensation gray scale corresponding to a first initial gray scale, and the second data signal may be generated based on a second initial gray scale. That is, the driving device may adjust only the first initial gray scale for generating the first data signal, that is, adjust only the display luminance of the first display region.
Alternatively, the first data signal may be generated based on a first compensation gray scale corresponding to a first initial gray scale, and the second data signal may be generated based on a second compensation gray scale corresponding to a second initial gray scale. That is, the driving device may simultaneously adjust a first initial gray scale for generating the first data signal and adjust a second initial gray scale for generating the second data signal, i.e., simultaneously adjust the display luminance of the two display regions. The embodiment of the present invention does not limit the adjustment method of the driving device.
In the embodiment of the present invention, the compensation gray scale corresponding to the initial gray scale can be determined according to the corresponding relationship between the initial gray scale and the compensation gray scale. The corresponding relationship may be pre-stored in the driving device, and the compensation gray scale corresponding to each initial gray scale is recorded in the corresponding relationship. For example, the driving device may store the corresponding relationship between the initial gray scale and the compensation gray scale in a list form, that is, the driving device may store a lookup table of the corresponding relationship between the initial gray scale and the compensation gray scale. Accordingly, after the driving device determines the initial gray scale of a certain pixel, the driving device can directly determine the compensation gray scale corresponding to the initial gray scale from the corresponding relationship.
Fig. 8 is a flowchart of a method for generating a corresponding relationship between an initial gray level and a compensation gray level, which can be applied to a driving apparatus of a display panel according to an embodiment of the present invention. As shown in fig. 8, before performing the step 601, the method may further include:
The first test area comprises a plurality of rows of pixels which can be started line by line, and the second test area comprises a plurality of rows of pixels, wherein at least two rows of pixels in the plurality of rows of pixels can be started simultaneously. Alternatively, the first test area may also be referred to as a human eye gaze area and the second test area may also be referred to as a non-gaze area.
In the embodiment of the present invention, the display panel may be tested before the display device leaves a factory, so as to determine the compensation gray scale corresponding to the initial gray scale when the absolute value of the luminance difference between the first test area and the second test area is smaller than or equal to the difference threshold. Before testing, the first test area and the second test area need to be determined on the display panel. The first test area may be an area formed by any adjacent rows of pixels on the display panel, and the second test area may be an area other than the first test area.
For example, assuming that the display panel includes 1600 rows of pixels, the driving apparatus may determine an area where the 500 th row to the 1000 th row of pixels located in the center of the display panel are located as the first test area. Accordingly, the driving apparatus can determine the area formed by the remaining pixels of the 1 st row to the 499 th row and the pixels of the 1001 st row to the 1600 th row as the second test area.
In the embodiment of the present invention, when determining the corresponding relationship between the initial gray scale and the compensation gray scale, for each frame of test image to be displayed, the driving device may obtain the third initial gray scale of each pixel when the frame of test image is displayed, and the third initial gray scales of each pixel when the driving device obtains the frame of test image is the same. And, the third initial gray level may be any one of gray levels of 0 to 255.
In the test process, the initial gray scales of all pixels are the same when a frame of test image is displayed, and the initial gray scales of all pixels are not completely the same when the display panel actually displays the image. Therefore, in order to determine the compensation gray scale corresponding to each initial gray scale, the test can be performed on multiple frames of test images one by one. For example, 256 frames of test images may be tested in sequence, with the initial gray levels of the pixels in the 256 frames of test images being 0 to 255 in sequence. That is, the initial gray scale of each pixel in the first frame of test image may be 0, the initial gray scale of each pixel in the second frame of test image may be 1, the initial gray scale of each pixel in the third frame of test image may be 2, and so on.
Further, the driving device may directly generate a corresponding third data signal according to each acquired third initial gray scale. And the driving device can output the third data signal to the corresponding pixel in the first test area in the process of turning on the pixel in the first test area so as to drive the pixel to emit light. And outputting the third data signal to the corresponding pixel in the second test area to drive the pixel to emit light in the process of starting the pixel in the second test area.
Alternatively, the target test area may be at least one of the first test area and the second test area. That is, the driving apparatus may improve the display uniformity of the display panel by adjusting the display luminance of any one of the first test region and the second test region.
In the embodiment of the present invention, before the step 803 is executed, the luminance of the first test area and the luminance of the second test area may be detected by using a luminance detection circuit, and the luminance unit may be nit (nit). The brightness of each test region may refer to an average brightness of pixels included in a sub-region of the test region. Then, the brightness detection circuit may send the detected brightness of the first test area and the second test area to the driving device, so that the driving device detects whether an absolute value of a brightness difference value of the two test areas is greater than a difference threshold value, and adjusts the brightness of at least one display area according to the detection result. Alternatively, the brightness detection circuit may be a color analyzer, which may be model CA 310.
When the driving device detects that the absolute value of the brightness difference is greater than the difference threshold, it may be determined that the display brightness difference between the two test areas is large, and at this time, the driving device may select to adjust a third initial gray scale corresponding to a pixel in at least one of the first test area and the second test area. The driving device may then continue to generate data signals based on the adjusted third initial gray scale and output the data signals to the corresponding pixels to adjust the brightness of the at least one test area. Then, the brightness detection circuit can be used to detect the brightness of the two test areas continuously, and so on, until the driving device detects that the absolute value of the brightness difference value of the two test areas is smaller than or equal to the difference threshold value.
The difference threshold may be pre-configured in the driving device, and may be configured by a developer according to experience. For example, the difference threshold may be less than a minimum brightness difference recognizable by the human eye, e.g., may be 5nit less than the minimum brightness difference.
Alternatively, the difference threshold may be 0. By setting the difference threshold to 0, the data signal generated based on the compensation gray scale can make the luminance difference between the two test areas to be 0, that is, the display luminance of the human eye watching area and the display luminance of the area other than the human eye watching area are consistent. Further ensuring display uniformity.
For example, assuming that the difference threshold is 0, the display luminance of the first test area sent by the luminance detection circuit to the driving apparatus is 10nit, and the display luminance of the second test area is 7nit, the driving apparatus may calculate that the absolute value of the luminance difference between the two test areas is 3nit, which is greater than the difference threshold 0. At this time, the driving device may selectively adjust the third initial gray scale of the pixels in the second test area to increase the brightness of the second test area, and/or adjust the third initial gray scale of the pixels in the first test area to decrease the brightness of the first test area.
Optionally, the target test area may be a second test area, and step 803 may include:
and when the display brightness of the first test area is detected to be larger than that of the second test area, increasing the third initial gray scale of the pixels in the second test area. That is, the amplitude of the generated data signal is increased.
And when the display brightness of the first test area is detected to be smaller than that of the second test area, reducing the third initial gray scale of the pixels in the second test area. That is, the amplitude of the generated data signal is reduced.
Since there may be some display panels of special performance, the brightness of the first test area may be less than the brightness of the second test area, so when this is detected, the third initial gray scale of the pixels in the second test area may be correspondingly reduced.
For example, it is assumed that the driving device detects that the display brightness of the first test area is greater than the display brightness of the second test area, and when the driving device obtains that the frame image is displayed, the third initial gray scale of a certain pixel in the first test area and the third initial gray scale of a certain pixel in the second test area are both 10. At this time, the driving device may increase the third initial gray scale corresponding to the pixels in the second test region, and when the third initial gray scale corresponding to the pixels in the second test region is adjusted to 12, the driving device detects the data signal generated according to the adjusted third initial gray scale, so that the luminance difference between the two test regions is 0. Thus, the drive unit can end the adjustment at this point.
And 804, taking the adjusted third initial gray scale as a third compensation gray scale corresponding to the third initial gray scale, and generating a corresponding relation between the initial gray scale and the compensation gray scale according to the third initial gray scale and the third compensation gray scale.
In the embodiment of the present invention, after the driving device determines the third compensation gray scale corresponding to the third initial gray scale, the driving device may generate the corresponding relationship between the initial gray scale and the compensation gray scale according to the third initial gray scale and the third compensation gray scale. Optionally, the corresponding relationship between the initial gray scale and the compensation gray scale may include a third compensation gray scale corresponding to a third initial gray scale of each pixel in the first test region, and/or a third compensation gray scale corresponding to a third initial gray scale of each pixel in the second test region.
For example, assuming that the target test gray scale is the second test area, when the driving device acquires that a frame of image is displayed, the third initial gray scale of each pixel is 10. And when the driving device determines that the absolute value of the luminance difference between the two test regions is smaller than or equal to the difference threshold, and the third compensation gray scale corresponding to the third initial gray scale 10 in the second test region is 12, the driving device can use 12 as the third compensation gray scale corresponding to the third initial gray scale 10. The third compensation gray levels for the other third initial gray levels can be calculated in the above step 803. Then, the driving device can generate the corresponding relation between the initial gray scale and the compensation gray scale according to each determined third initial gray scale and third compensation gray scale.
It should be noted that steps 801 to 804 may be executed before the display panel is shipped. Optionally, the driving device may include: a driver chip and a DDIC. The driving chip can be used for determining the first display area and the second display area, and can also be used for generating and storing the corresponding relation between the initial gray scale and the compensation gray scale, so that the DDIC can determine the compensation gray scale corresponding to the initial gray scale acquired in real time according to the corresponding relation in the use process of the display panel. The driving chip and the DDIC may be two chips independent of each other, or may be integrated in one chip.
It should be noted that, the sequence of the steps for generating the corresponding relationship between the initial gray scale and the compensation gray scale provided by the embodiment of the present invention may be appropriately adjusted, and the steps may also be increased or decreased according to the situation. For example, the above step 803 and step 804 may be performed simultaneously. Any method that can be easily conceived by those skilled in the art within the technical scope of the present disclosure is covered by the protection scope of the present disclosure, and thus, the detailed description thereof is omitted.
In summary, the embodiments of the present invention provide a driving method of a display panel. Since the method can output the data signal generated based on the compensation gray scale corresponding to the initial gray scale to the pixel in at least one of the first display region and the second display region. Therefore, the absolute value of the luminance difference value of the two display regions can be made smaller than or equal to the difference threshold value, i.e., the difference in display luminance of the two display regions is made small. The display panel has good display uniformity.
An embodiment of the present invention provides a compensation circuit for a display panel, where the compensation circuit may be configured to:
a first display area and a second display area are determined. The first display region may include a plurality of rows of pixels that may be turned on line by line, and the second display region may include a plurality of rows of pixels in which at least two rows of pixels are simultaneously turned on.
According to a first initial gray scale of pixels in the first display area, first data signals are output to the pixels in the first display area.
And outputting a second data signal to the pixels of the second display area according to the second initial gray scale of the pixels in the second display area.
At least one of the first data signal and the second data signal is generated based on a compensation gray scale corresponding to an initial gray scale of a pixel output by the data signal, and the absolute value of a luminance difference value between the luminance of the first display area and the luminance of the second display area is smaller than or equal to a difference threshold value based on the data signal generated based on the compensation gray scale.
In summary, the embodiments of the present invention provide a compensation circuit for a display panel. The compensation circuit may be configured to output a data signal generated based on a compensation gray scale corresponding to the initial gray scale to a pixel in at least one of the first display region and the second display region. Therefore, the absolute value of the luminance difference value of the two display regions can be made smaller than or equal to the difference threshold value, i.e., the difference in display luminance of the two display regions is made small. The display panel has good display uniformity.
The compensation circuit of the display panel in the above embodiment may also be used to perform the methods of steps 801 to 804, and the functions performed by the compensation circuit have been described in detail in the embodiments of the method, and will not be described in detail here. The compensation circuit of the display panel may be integrated in a DDIC included in a driving apparatus of the display panel, and may be integrated in a source driving circuit included in the DDIC.
An embodiment of the present invention provides a driving apparatus for a display panel, where the driving apparatus may include: a processor and a memory and a computer program stored on said memory, the processor being capable of implementing the method of driving a display panel as shown in fig. 6 or fig. 8 when executing the computer program. Furthermore, the compensation circuit of the display panel provided by the above embodiments may be integrated in the driving device of the display panel.
An embodiment of the present invention provides a display device, which may include: the compensation circuit provided by the above embodiment, or the driving device provided by the above embodiment.
In addition, the display device may further include a display panel, and the compensation circuit or the driving device may be connected to the display panel. The display device may be: any product or component with a display function, such as an LCD panel, electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the compensation circuit and the driving apparatus of the display panel described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The invention is not to be considered as limited to the particular embodiments shown and described, but is to be understood that various modifications, equivalents, improvements and the like can be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method of driving a display panel, the method comprising:
determining a first display area and a second display area, wherein a plurality of rows of pixels included in the first display area are started line by line, and at least two rows of pixels in the plurality of rows of pixels included in the second display area are started simultaneously;
outputting a first data signal to the pixels of the first display area according to a first initial gray scale of the pixels in the first display area;
outputting a second data signal to the pixels of the second display area according to a second initial gray scale of the pixels in the second display area;
wherein at least one of the first data signal and the second data signal is generated based on a compensation gray scale corresponding to an initial gray scale of a pixel to be output, and an absolute value of a luminance difference between the luminance of the first display region and the luminance of the second display region is made smaller than or equal to a difference threshold based on the data signal generated based on the compensation gray scale.
2. The method of claim 1,
the first display area is a human eye watching area determined according to a watching point of human eyes on the display panel, and the second display area is an area except the human eye watching area.
3. The method of claim 1,
the first display area is a set area for displaying a first resolution image on the display panel, the second display area is a set area for displaying a second resolution image on the display panel, and the first resolution is greater than the second resolution.
4. The method according to claim 2 or 3,
the first data signal is generated based on the first initial gray scale;
the second data signal is generated based on a second compensation gray scale corresponding to the second initial gray scale.
5. The method of claim 1, wherein the compensation gray scale corresponding to the initial gray scale is determined according to a corresponding relationship between the initial gray scale and the compensation gray scale, and before outputting the first data signal to the pixel of the first display region, the method further comprises:
determining a first test area and a second test area, wherein a plurality of rows of pixels included in the first test area are started line by line, and at least two rows of pixels in the plurality of rows of pixels included in the second test area are started simultaneously;
outputting a third data signal generated based on a third initial gray scale to both the pixels of the first test area and the pixels of the second test area;
when detecting that the absolute value of the brightness difference between the brightness of the first test area and the brightness of the second test area is greater than the difference threshold, adjusting a third initial gray scale of the pixel in a target test area, and updating a corresponding data signal based on the adjusted third initial gray scale until the absolute value of the brightness difference between the brightness of the first test area and the brightness of the second test area is less than or equal to the difference threshold, wherein the target test area is at least one of the first test area and the second test area;
and taking the adjusted third initial gray scale as a third compensation gray scale corresponding to the third initial gray scale, and generating a corresponding relation between the initial gray scale and the compensation gray scale according to the third initial gray scale and the third compensation gray scale.
6. The method of claim 5, wherein the target test area is the second test area, and wherein adjusting the third initial gray level of the pixels in the target test area comprises:
when the display brightness of the first test area is detected to be larger than that of the second test area, increasing a third initial gray scale of the pixels in the second test area;
and when the display brightness of the first test area is detected to be smaller than that of the second test area, reducing the third initial gray scale of the pixels in the second test area.
7. The method of claim 5, wherein the difference threshold is 0.
8. A compensation circuit of a display panel, the compensation circuit being configured to:
determining a first display area and a second display area, wherein a plurality of rows of pixels included in the first display area are started line by line, and at least two rows of pixels in the plurality of rows of pixels included in the second display area are started simultaneously;
outputting a first data signal to the pixels of the first display area according to a first initial gray scale of the pixels in the first display area;
outputting a second data signal to the pixels of the second display area according to a second initial gray scale of the pixels in the second display area;
at least one of the first data signal and the second data signal is generated based on a compensation gray scale corresponding to an initial gray scale of a pixel to be output, and an absolute value of a luminance difference between the luminance of the first display region and the luminance of the second display region is smaller than or equal to a difference threshold based on the data signal generated based on the compensation gray scale.
9. A driving apparatus of a display panel, the driving apparatus comprising: a processor and a memory and a computer program stored on the memory, the processor implementing a method of driving the display panel of any one of claims 1 to 7 when executing the computer program; the compensation circuit of the display panel is integrated in the driving device of the display panel.
10. A display device, characterized in that the display device comprises: a compensation circuit as claimed in claim 8 or a drive arrangement as claimed in claim 9.
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| CN110459162B (en) * | 2019-08-30 | 2021-07-23 | 霸州市云谷电子科技有限公司 | Brightness compensation data acquisition method, device and equipment |
| CN112581903B (en) * | 2019-09-30 | 2022-05-06 | 华为终端有限公司 | Pixel compensation method and electronic equipment |
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| CN113314063B (en) * | 2021-05-31 | 2023-08-08 | 北京京东方光电科技有限公司 | Display panel driving method and device and display equipment |
| WO2023272525A1 (en) * | 2021-06-29 | 2023-01-05 | Boe Technology Group Co., Ltd. | Method for driving display panel, timing controller, display apparatus and method of calibrating a display apparatus |
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