CN113077744B - Pixel charging duration adjusting method, time sequence controller and display device - Google Patents
Pixel charging duration adjusting method, time sequence controller and display device Download PDFInfo
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Abstract
The utility model provides a pixel charging time length adjusting method, a time schedule controller and a display device, the adjusting method is characterized in that on the premise of ensuring that the charging time length of each frame of image is kept unchanged, a part of the time length of a field blanking area of each frame of image is used for compensating the time length of a line blanking area of each line of pixels, the time length of the line blanking area of the pixels from the 1 st line to the nth line from the near to the source driver is gradually increased, so that the time length of the line blanking area of the pixels from the 1 st line to the nth line from the near to the source driver is gradually increased, namely, the charging time length of each line of pixels is increased correspondingly, namely, the charging rate of each line of pixels can meet the requirement, to avoid the problem of insufficient charging rate of pixels in the far row.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a method for adjusting a pixel charging duration, a timing controller, and a display device.
Background
After the gate driver provides the scan signal to turn on the pixels in the display panel, the source driver provides the data signal to the pixels in the display panel through the vertical data line for charging, but since the data lines have the resistance-capacitance load, and the resistance-capacitance load of the data lines farther from the source driver is larger, therefore, the charging time period of the pixels at the farther distance from the source driver is shorter, and thus the pixels at the farther distance from the source driver may have an insufficient charging rate, which increases with the refresh rate of the display panel, and the increased resolution due to the increased size, insufficient charging of the pixels in the far row can cause uneven charging of the pixels in the display panel, therefore, the display quality of the display panel is seriously affected due to the abnormal picture of the display panel caused by the phenomena of water wave or color cast.
Aiming at the problem of insufficient charging rate of pixels on a far-end row, the current method is as follows: however, the overall charging duration of the display panel is increased by this method, which is not favorable for increasing the refresh rate of the display panel, and therefore, it is necessary to provide a method for adjusting the charging duration of the pixels without increasing the overall charging duration of the display panel, so as to reduce the phenomenon of insufficient charging rate of the pixels in the far end row.
Disclosure of Invention
In order to solve the problem of insufficient charging rate of the far-end row pixels of the display panel and not to prolong the overall charging time of the display panel, embodiments of the present application provide a method for adjusting a pixel charging duration, a timing controller and a display device.
In a first aspect, an embodiment of the present application provides a method for adjusting a pixel charging time, which is applied to a display panel, where the display panel includes pixels in a line 1 to an n-th from a source driver, n is a positive integer, the charging time of each line of pixels includes a time length of a line active area and a time length of a line blanking area, the charging time of each frame of image includes a time length of a field active area and a time length of the field blanking area, and the method for adjusting the pixel charging time includes:
when the charging time length of each frame of image is kept unchanged, the time length of a field blanking area of each frame of image is reduced, and the time length of a line blanking area of the pixels of the 1 st line to the nth line is gradually increased, so that the time length of the line blanking area of the pixels of the 1 st line to the nth line is gradually increased.
In some embodiments, a time period during which the field blanking region of each frame image is decreased is equal to a sum of time periods during which the line blanking regions of the 1 st line to the nth line pixels are increased.
In some embodiments, the method for adjusting the pixel charging time further includes: increasing a frequency of a pixel clock to reduce a duration of the line effective area of each line of pixels such that a duration of the field effective area of the each frame image is reduced.
In some embodiments, a time period during which the field effective area of each frame image is decreased and a time period during which the field blank area is decreased are equal to a sum of time periods during which the line blank areas of the 1 st line to the nth line pixels are increased.
In some embodiments, the method for adjusting the pixel charging time further includes: and inputting each line of pixel data into each line of pixels in the line effective area of each line of pixels after compression and decompression.
In a second aspect, an embodiment of the present application further provides a timing controller, configured to apply the method for adjusting the pixel charging time period as described above to a display panel, where the display panel includes pixels in rows 1 to n from near to far from a source driver, and n is a positive integer, where the timing controller includes a receiving module and a charging time period adjusting module, where:
the receiving module is used for receiving pixel data, a pixel clock and an effective data gating signal sent by the front end;
and the charging duration adjusting module is used for adjusting the effective data gating signal according to the pixel clock data when the charging duration of each frame of image is kept unchanged so as to reduce the duration of a field blanking area of each frame of image, and gradually increasing the duration of the line blanking area of the pixels in the 1 st line to the nth line, so that the duration of the line blanking area of the pixels in the 1 st line to the nth line is gradually increased.
In some embodiments, the timing controller further comprises a clock adjustment module to: increasing the frequency of the pixel clock to reduce the duration of the row active area for each row of pixels.
In some embodiments, the timing controller further comprises a compression module, a line cache module, and a decompression module, wherein:
the compression module is used for buffering the pixel data of each line of pixels in the line buffering module after compression;
the decompression module is configured to decompress the pixel data buffered in the line buffer module according to the adjusted valid data strobe signal, and then input the decompressed pixel data into each line of pixels in the line valid area of each line of pixels.
In some embodiments, each row of pixels is in the row active area when the active data strobe signal is high; when the effective data strobe signal is at low level, each row of pixels is in the line blanking region.
The method for adjusting pixel charging time, the timing controller and the display device provided in the embodiments of the present application, on the premise of ensuring that the charging time of each frame of image is kept unchanged, a part of the time of the field blanking region of each frame of image is used to compensate the time of the line blanking region of each line of pixels, and the time of the line blanking region of the line 1 to the nth line of pixels from the near to the far from the source driver is gradually increased, so that the time of the line blanking region of the line 1 to the nth line of pixels from the far to the near from the source driver is gradually increased, so as to correspondingly compensate the defect that the capacitance resistance load of the data line corresponding to the line 1 to the nth line of pixels from the near to the source driver is larger and larger, thereby increasing the charging time of each line of pixels, that is, the charging rate of each line of pixels can meet the requirement, to avoid the problem of insufficient charging rate of pixels in the far row.
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The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
FIG. 1 is a schematic diagram illustrating pixel charging in a frame of image according to the prior art.
Fig. 2 is a schematic diagram of charging a first pixel in a frame image according to the method for adjusting a pixel charging duration provided in the embodiment of the present application.
Fig. 3 is a first timing diagram of a method for adjusting a pixel charging duration according to an embodiment of the present disclosure.
Fig. 4 is a schematic diagram of charging a second pixel in a frame image according to the method for adjusting the pixel charging duration provided in the embodiment of the present application.
Fig. 5 is a second timing diagram illustrating a method for adjusting a pixel charging duration according to an embodiment of the present disclosure.
Fig. 6 is a schematic diagram of an overall structure of a timing controller according to an embodiment of the present disclosure.
Fig. 7 is a schematic structural diagram of a timing controller according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the display panel, a line effective area Hactive refers to a process of horizontally scanning each line of pixels of a display area, and a line blanking area Hblank refers to a return process between lines; the field active area Vactive refers to a process of horizontally scanning all the line pixels of the display area in one frame of image, and the field blanking area Vblank refers to a return process of returning to the upper left corner of the image from the lower right corner of the image after scanning one frame of image.
Fig. 1 is a schematic diagram of charging pixels in a frame image in the prior art, and as shown in fig. 1, the duration of a line active area Hactive and the duration of a line blanking area Hblank of each line of pixels are fixed durations. The charging time period of each line of pixels comprises the time period of a line effective area Hactive and the time period of the line blanking area Hblank, the charging time period of each frame of image comprises the time period of a field effective area Vactive and the time period of the field blanking area Vblank,
based on this, an embodiment of the present application provides a method for adjusting a pixel charging duration, which is applied to a display panel, where the display panel includes pixels in a 1 st row to an n th row from a source driver, where n is a positive integer, and the method for adjusting the pixel charging duration includes:
reducing the time length of a field blanking area Vblank of each frame image while the charging time length of each frame image is kept constant, and gradually increasing the time length of a line blanking area Hblank of the 1 st to nth line pixels so that the time length of the line blanking area Hblank of the 1 st to nth line pixels is gradually increased.
Specifically, fig. 2 is a schematic diagram of charging pixels in a frame of image according to the method for adjusting the pixel charging time length provided by the embodiment of the present application, and as shown in fig. 1 and fig. 2, in this embodiment, the time length of the field blank region Vblank of each frame of image is reduced by a part for compensating the time length of the line blank region Hblank of each line of pixels, and the charging time of the line pixels from the near to the far from the source driver is increased from short to long due to the fact that the data lines corresponding to the line pixels from the near to the far from the source driver are increased from short to long, that is, the resistance-capacitance load of the corresponding data lines is increased from small to large, so that the charging time of the line pixels from the near to the far from the source driver is increased from short to long, and thus the charging time of the far line pixels is increased, and thus the charging rate of the far line pixels is greatly increased, the problem of insufficient charging rate of pixels in a far-end row is avoided. Meanwhile, the charging time of each frame of image is kept unchanged, so that the time of each frame of image is kept unchanged.
Referring to fig. 1 and 2, in the present embodiment, in order to ensure that the time length of each frame of image remains unchanged, so that the display panel maintains a fixed refresh rate, the sum of the time length of the reduction of the field blank area Vblank of each frame of image and the time length of the increase of the line blank area Hblank of the pixels of the 1 st to nth rows is equal.
It should be noted that the increasing degree of the line blanking region Hblank of the pixels in the 1 st to nth rows is linear or non-linear, that is, the edge curve formed by the increasing time Δ Hblank of the line blanking region Hblank is a linear curve or a non-linear curve, and may be set according to practical situations, for example, the increasing time of the line blanking region Hblank of the pixels in the row near the source driver is less, and the increasing time of the line blanking region Hblank of the pixels in the row far from the source driver is more.
It is to be noted that the duration of the line effective area Hactive of each line of pixels shown in fig. 2 is not changed, that is, the duration of the field effective area Vactive of each frame image is also not changed, so this embodiment can increase the charging duration of each line of pixels when increasing the duration of the line blank area Hblank of each line of pixels. However, it is understood that, in the case where the charging time period of one frame image is not changed, this may cause the line blank region Hblank to increase for a limited time period (due to the limited time period of the field blank region Vblank), and thus the charging time period for the far-end line pixels may not be increased enough, so that the far-end line pixels still cannot reach the preset charging rate.
In order to solve the problem, the method for adjusting the pixel charging time provided by the embodiment of the present application further includes: the frequency of the pixel clock is increased to reduce the time length between the line effective areas Hactive of each line of pixels, so that the time length of the field effective area Vactive of each frame of image is reduced.
Specifically, fig. 4 is a schematic diagram of charging a second pixel in a frame of image by the method for adjusting the pixel charging time length according to the embodiment of the present invention, as shown in fig. 1 and fig. 4, in this embodiment, the pixel clock is increased, that is, the speed of each line of pixels in the horizontal scanning display area is increased, so as to increase the speed of all lines of pixels in the horizontal scanning display area, that is, the time length of the line active area Hactive of each line of pixels is decreased, and the time length of the field active area Vactive of each frame of image is also decreased, thereby compressing the charging time length of the near-end line pixels, leaving the time length of the field blanking area Vblank decreased for increasing the time length of the line blanking area Hblank of the far-end line pixels, and as shown in fig. 1 and fig. 4, the small shaded area in fig. 4 is the sum of the charging time lengths of the near-end line pixels decreased, and increasing the charging time length of the small shaded area to the increasing time length of the line blanking area Hblank of the far-end line pixels, to further increase the duration of the line blanking area Hblank of the far-end line pixels, so that the duration of the line active area Hactive and the line blanking area Hblank of the far-end line pixels can be increased more than in fig. 2. It should be noted that the small shaded area is only for comparison with fig. 1, and is not a part of fig. 4.
That is, as shown in fig. 1 and 4, on the premise that the charging time period of each frame image remains unchanged, the sum of the time period for which the field effective region Vactive decreases and the time period for which the field blank region Vblank decreases is equal to the time period for which the line blank regions Hblank of the pixels of the 1 st line to the nth line increase.
It should be noted that, since the charging process of each row of pixels is performed according to the valid data strobe signal DE, generally, when the valid data strobe signal DE is at a high level, the row of pixels is in the row active area Hactive; when the valid data strobe signal DE is low, the line pixels are in the line blank region Hblank. Therefore, when the pixel charging time adjusting method needs to adjust the durations of the line effective area Hactive, the line blanking area Hblank, the field effective area Vactive and the field blanking area Vblank, multiple lines of pixel data are buffered to adjust the effective data strobe signal DE corresponding to each line of pixels, and in order to enable the timing controller to support the buffering of the multiple lines of pixel data to adjust the effective data strobe signal DE corresponding to each line of pixels, the embodiment of the application inputs the compressed and decompressed pixel data of each line into the pixels of each line in the line effective area Hactive of each line of pixels.
Fig. 6 is a schematic diagram of an overall structure of a timing controller according to an embodiment of the present disclosure, as shown in fig. 6, the embodiment of the present disclosure further provides a timing controller TCON, which is configured to apply the method for adjusting the pixel charging time to a display panel, where the display panel includes pixels in rows 1 to n from near to far from a source driver, n is a positive integer, and the timing controller includes a receiving module and a charging time adjusting module, where:
a receiving module 701, configured to receive pixel data, a pixel clock, and an effective data strobe signal DE sent by a front end;
a charging duration adjusting module 702, configured to decrease the duration of the vertical blanking interval Vblank of each frame of image and gradually increase the duration of the line blanking interval Hblank of the pixels in the 1 st line to the nth line, so that the duration of the line blanking interval Hblank of the pixels in the 1 st line to the nth line gradually increases.
The timing controller provided in the embodiment of the application, on the premise of ensuring that the charging duration of each frame of image remains unchanged, uses a part of the duration of the field blank region Vblank of each frame of image to compensate the duration of the line blank region Hblank of each line of pixels, gradually increases the duration of the line blank region Hblank of the line 1 to the nth line of pixels from near to far away from the source driver, so that the duration of the line blanking region Hblank of the line 1 to line n pixels is gradually increased, that is, the charging time of the pixels from row 1 to row n from the far to the near from the source driver is gradually increased, correspondingly compensating the defects that the resistance-capacitance load of the data lines corresponding to the pixels of the 1 st row to the n th row from the near to the far of the source driver is larger and larger, thereby increasing the charging time of each row of pixels, that is, the charging rate of each row of pixels can meet the requirement, so as to avoid the problem of insufficient charging rate of pixels in the far-end row.
Fig. 7 is a schematic structural diagram of a timing controller according to an embodiment of the present application, and as shown in fig. 7, the timing controller further includes a clock adjusting module 703, where the clock adjusting module is configured to: the frequency of the pixel clock is increased to reduce the duration between the line active areas Hactive of each line of pixels.
It should be noted that, if the embodiment corresponding to fig. 2 is adopted, the frequency of the pixel clock does not need to be adjusted, and at this time, the clock adjusting module does not change the pixel clock, that is, the input pixel clock and the output clock are the same, whereas if the embodiment corresponding to fig. 4 is adopted, the clock adjusting module increases the frequency of the pixel clock.
Further, the timing controller further comprises a compression module 704, a line buffer module 705 and a decompression module 706, wherein:
a compressing module 704, configured to buffer the pixel data of each line of pixels after compression in a line buffering module 705;
a decompression module 706, configured to decompress the pixel data buffered in the line buffer module 705 according to the adjusted valid data strobe signal DE, and then input the decompressed pixel data into each line of pixels in the line valid area Hactive of each line of pixels.
Fig. 3 is a first timing diagram corresponding to the method for adjusting the pixel charging time period provided by the embodiment of the present application in fig. 2, and fig. 5 is a second timing diagram corresponding to the method for adjusting the pixel charging time period provided by the embodiment of the present application in fig. 4, where I _ CLK is an input pixel clock, O _ CLK is an output pixel clock, I _ DE is an input DE, R _ DE is an output DE of the charging time period adjusting module of the timing controller after reconstruction according to I _ DE, and frame _ start _ tick is a frame start signal.
For convenience of description, fig. 3 and 5 adopt a bottom-up scanning method, that is, adopt a scanning sequence from the near to the far from the source driver to sequentially charge the pixels in the 1 st row and the n th row from the near to the source driver.
Specifically, as can be seen from fig. 2 and 3, I _ CLK is the same as O _ CLK, R _ DE is generated according to I _ DE, and therefore R _ DE lags behind I _ DE, the line active areas Hactive of I _ DE and R _ DE have the same duration, and the line blanking areas Hblank of R _ DE have durations that are gradually increased by the line pixels from the near to the far from the source driver. As can be seen from fig. 4 and 5, the frequency of O _ CLK is higher than that of I _ CLK, i.e. the pulse width of O _ CLK is shorter than that of I _ CLK, the duration of the line active area Hactive of I _ DE is shorter than that of the line active area Hactive of R _ DE, and the duration of the line blanking area Hblank of R _ DE is gradually increased from the near to the far line pixels from the source driver, so that, while the charging duration of each frame image is kept constant, the charging duration of the near line pixels is compressed, the duration of the field blanking area Vblank is decreased is left for more time to increase the duration of the line blanking area Hblank of the far line pixels, and the duration of the line blanking area Hblank of the far line pixels is further increased, so that the duration of the line active area Hactive and the line blanking area Hblank of the far line pixels can be increased more than that in fig. 3.
Based on the foregoing embodiments, an embodiment of the present application further provides a display device, where the display device includes a display panel, a source driver, and the timing controller as described above, where the display panel includes pixels in rows 1 to n from near to far from the source driver, n is a positive integer, and the timing controller is configured to: reducing the time length of a field blanking area Vblank of each frame image while the charging time length of each frame image is kept constant, and gradually increasing the time length of a line blanking area Hblank of the 1 st to nth line pixels so that the time length of the line blanking area Hblank of the 1 st to nth line pixels is gradually increased.
In summary, the method for adjusting the pixel charging time, the timing controller and the display device provided in the embodiments of the present application, on the premise of ensuring that the charging time of each frame of image is kept unchanged, a part of the time of the field blank region Vblank of each frame of image is used to compensate the time of the line blank region Hblank of each line of pixels, and the time of the line blank region Hblank of the pixels from the 1 st line to the nth line from the near to the source driver is gradually increased, so that the time of the line blank region Hblank of the pixels from the 1 st line to the nth line from the near to the source driver is gradually increased, that is, the charging time of each line of pixels is increased by correspondingly compensating the defect that the resistance load of the data line corresponding to the pixels from the 1 st line to the nth line from the near to the source driver is larger, that is, i.e., the charging rate of each line of pixels can reach the requirement, to avoid the problem of insufficient charging rate of pixels in the far row. In addition, the compression module and the decompression module are added in the time sequence controller, so that the problem of cost increase caused by the adoption of a large SRAM or DDR in the time sequence controller is solved.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above description of the embodiments is only for assisting understanding of the technical solutions and the core ideas thereof; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (8)
1. A method for adjusting pixel charging time length is applied to a display panel, the display panel comprises pixels from line 1 to line n from near to far from a source driver, n is a positive integer, the charging time length of each line of pixels comprises the time length of a line effective area and the time length of a line blanking area, the charging time length of each frame of image comprises the time length of a field effective area and the time length of the field blanking area, and the method for adjusting the pixel charging time length comprises the following steps: when the charging time of each frame of image is kept unchanged, reducing the time length of a field blanking area of each frame of image, and gradually increasing the time length of a line blanking area of the pixels of the 1 st line to the nth line, so that the time length of the line blanking area of the pixels of the 1 st line to the nth line is gradually increased;
the pixel charging time length adjusting method further comprises the following steps: increasing a frequency of a pixel clock to reduce a duration of the line active area of each line of pixels such that a duration of the field active area of the each frame image is reduced.
2. The method for adjusting pixel charging time according to claim 1, wherein the time length for which the vertical blanking region of each frame image is decreased is equal to the sum of the time lengths for which the line blanking regions of the pixels of the 1 st line to the nth line are increased.
3. The method for adjusting pixel charging time according to claim 1, wherein the time length for which the field effective area of each frame image is decreased and the time length for which the field blank area is decreased are equal to the sum of the time lengths for which the line blank areas of the line 1 to line n pixels are increased.
4. The method for adjusting a pixel charging period according to claim 1, wherein the method for adjusting a pixel charging period further comprises: and inputting the compressed and decompressed pixel data of each line into the pixels of each line in the line effective area of the pixels of each line.
5. A timing controller for applying the method of adjusting pixel charging time according to any one of claims 1 to 4 to a display panel, the display panel including pixels in rows 1 to n from a source driver, n being a positive integer, wherein the timing controller includes a receiving module, a charging time adjusting module, and a clock adjusting module, wherein:
the receiving module is used for receiving pixel data, a pixel clock and an effective data gating signal sent by the front end;
the charging duration adjusting module is used for adjusting the effective data gating signal according to the pixel clock data when the charging duration of each frame of image is kept unchanged so as to reduce the duration of a field blanking area of each frame of image, and gradually increasing the duration of the line blanking area of the pixels in the 1 st line to the nth line, so that the duration of the line blanking area of the pixels in the 1 st line to the nth line is gradually increased;
the clock adjustment module is configured to: increasing the frequency of the pixel clock to reduce the duration of the row active area for each row of pixels.
6. The timing controller of claim 5, further comprising a compression module, a line cache module, and a decompression module, wherein:
the compression module is used for caching the pixel data of each line of pixels in the line cache module after compression;
the decompression module is configured to decompress the pixel data buffered in the line buffer module according to the adjusted valid data strobe signal, and then input the decompressed pixel data into each line of pixels in the line valid area of each line of pixels.
7. The timing controller of claim 5, wherein each row of pixels is in the row active area when the active data strobe signal is high; when the effective data strobe signal is at low level, each row of pixels is in the line blanking region.
8. A display device, comprising a display panel, a source driver, and the timing controller according to any one of claims 5-7, wherein the display panel comprises pixels from row 1 to row n from the source driver, n is a positive integer, the timing controller is configured to:
when the charging time of each frame of image is kept unchanged, the time length of a field blanking area of each frame of image is reduced, and the time length of a line blanking area of the pixels of the 1 st line to the nth line is gradually increased, so that the time length of the line blanking area of the pixels of the 1 st line to the nth line is gradually increased.
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| CN103745694A (en) * | 2013-11-27 | 2014-04-23 | 深圳市华星光电技术有限公司 | Driving method and driving circuit of display panel |
| CN106875905B (en) * | 2017-01-04 | 2019-03-26 | 京东方科技集团股份有限公司 | A kind of driving method of display panel, driving circuit and display device |
| CN112053651A (en) * | 2019-06-06 | 2020-12-08 | 京东方科技集团股份有限公司 | Time sequence control method and circuit of display panel, driving device and display equipment |
| CN111477151B (en) * | 2020-05-06 | 2021-07-23 | Tcl华星光电技术有限公司 | Display device and charging control method applied to display device |
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