CN110379391B - Liquid crystal display panel and method for improving dynamic picture trailing of liquid crystal display panel - Google Patents
Liquid crystal display panel and method for improving dynamic picture trailing of liquid crystal display panel Download PDFInfo
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- CN110379391B CN110379391B CN201910589676.1A CN201910589676A CN110379391B CN 110379391 B CN110379391 B CN 110379391B CN 201910589676 A CN201910589676 A CN 201910589676A CN 110379391 B CN110379391 B CN 110379391B
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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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
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
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Abstract
The invention provides a liquid crystal display panel and a method for improving dynamic picture trailing of the liquid crystal display panel, and belongs to the technical field of liquid crystal panels. The liquid crystal display panel comprises a time sequence controller, wherein a first OD table and a second OD table are arranged in the time sequence controller, the first OD table is normally started in a first frame of gray scale change, and the second OD table is started in a later frame of a descending stage of the gray scale change. According to the invention, the first frame OD and the second frame of the dynamic frame are subjected to OD actions through the first OD table and the second OD table, so that the liquid crystal cross pressure is increased to quickly recover the liquid crystal, the phenomenon of brightness reduction of the second frame caused by over-strong first frame OD is improved, and display blacking is improved.
Description
Technical Field
The invention relates to the technical field of display panels, in particular to a liquid crystal display panel and a method for improving dynamic picture tailing of the liquid crystal display panel.
Background
Since the lcd panel is limited by the Response speed of the liquid crystal material, when the gray scale value of the pixel is changed, the liquid crystal material needs a Response Time (Response Time) to reach the correct gray scale value to be displayed, which causes the problem of trailing of the dynamic image.
Fig. 1 shows a conventional overvoltage driving table, abbreviated as an OD table, in which the first row abscissa of the OD table in the X direction is the gray scale (e.g., 0, 16, 32, 48, …, 255) of the Previous frame (Previous frame), and the first column left side of the OD table in the Y direction is the gray scale (e.g., 0, 16, 32, 48, …, 255) of the Current frame (Current frame). The gray scale of the panel is divided into 255 steps, the gray scale is divided into 17 × 17 in equal proportion, and corresponding OD values are filled according to the panel.
If the gray scale value of the previous frame (n-1) to the current frame n is increased (actually, the gray scale value is determined to be increased or decreased according to the characteristics of the panel), the driving voltage is increased, if the gray scale image is switched from 64 gray scales to 128 gray scales, the value of 64 gray scales to 128 gray scales in the OD table is 142, and then the pixel voltage corresponding to 142 gray scales is output, so that the liquid crystal can be rapidly rotated to the angle corresponding to 128 gray scales, and the image is displayed without black dragging or white dragging.
Similarly, the gray scale value of the previous frame n-1 to the current frame n is decreased (it is actually determined whether the gray scale value is increased or decreased according to the characteristics of the panel), thereby decreasing the driving voltage. If the gray scale frame is switched from 128 gray scale to 64 gray scale, the OD table outputs the pixel voltage corresponding to 50 gray scale.
As shown in fig. 2, the waveform of the luminance of the liquid crystal display panel is shown, the left side of the screen in fig. 2 is the luminance waveform of the display panel when the OD is not operating, and the right side of the screen is the luminance waveform of the display panel when the OD is operating. When OD does not work, the F (n-1) frame is a 255 gray scale picture, and when the F (n) frame is switched to a 96 gray scale picture, because the characteristic of the liquid crystal material can not rotate to an angle corresponding to 96 gray scale within one frame time (16.66ms), the picture stays in a gray scale picture larger than 96 gray scale, and obvious white dragging phenomenon can be observed. When OD works and F (n-1)255 gray scale is switched to F (n) frame 96 gray scale, a Tcon (time schedule controller) inquires an OD table and outputs a corresponding OD table gray scale voltage value, the pixel liquid crystal can quickly rotate to an angle corresponding to the 96 gray scale, and the dynamic picture display is normal. However, if the pixel voltage is unstable, in order to ensure the gray-scale luminance corresponding to the F (n) frame, the corresponding OD table needs to be strong, and at this time, the phenomenon shown in the right-side drawing appears, the F (n +1) liquid crystal continues to rotate, so that the luminance of the F (n +1) frame is lower than the designed value, and at this time, the phenomenon that the vicinity of the display edge of the drawing is blackened appears.
Fig. 3 is a waveform diagram of the luminance of the pixel N of the liquid crystal display panel, and fig. 4 is a waveform diagram of the luminance of the pixel N +1 of the liquid crystal display panel. Pixel N is switched from 255 negative polarity to OD (10) positive polarity because Δ V255< Δ V10, Vlc10+ × not ═ V10+ - (Vcom + Δ V ↓); therefore, the brightness of the picture at the end of the first frame (f (n)) exceeds L96, which is assumed to be L110; the positive polarity was switched from OD (10) to 96 negative polarities. Because Δ V110< Δ V96; vlc96 ↓ + Vcom + Δ V ↓ -V96 —; the luminance of the second frame (F (n +1)) continues to decrease, as shown in the left panel of fig. three. The pixel N +1 is switched from 255 positive polarity to OD (10) negative polarity. Because Δ V255< Δ V10; vlc10 ↓ + Vcom + Δ V ↓ -V10 —; the luminance at the end of the first frame (Fn) is lower than L96, assumed to be L80; negative polarity of OD (10) was switched to positive polarity of 96. Because Δ V80> Δ V96; vlc96+ ↓ ═ V96+ - (Vcom + Δ V ↓); since the luminance of the second frame (F (n +1)) continues to decrease, the overall display luminance of the second frame (F (n +1)) further decreases, and the screen display becomes black.
The conventional solution to the problem of dynamic image tailing is to add an OD function, but if the pixel voltage is unstable, the conventional OD function cannot solve the problem of dynamic tailing.
Disclosure of Invention
The invention aims to provide a liquid crystal display panel which increases the liquid crystal cross voltage to quickly recover liquid crystal and improve the display blacking and a method for improving the trailing of a dynamic picture of the liquid crystal display panel.
The invention provides a liquid crystal display panel, which comprises a time sequence controller, wherein a first OD table and a second OD table are arranged in the time sequence controller, wherein the first OD table is normally started in a first frame of gray scale change, and the second OD table is started in a later frame of a descending stage of the gray scale change.
Further, the first OD table is normally activated in the first frame of the falling and rising phases of the gray scale change.
Further, executing a first OD table under the condition that the gray-scale brightness of the previous frame n-1 is not the same as the gray-scale brightness of the current frame n; and executing the second OD table under the condition that the starting condition of the first OD table is met and the gray-scale brightness of the previous frame n-1 is the same as the gray-scale brightness of the current frame n.
Further, the first OD table and the second OD table are divided in equal proportion according to the same proportion.
The invention also provides a method for improving the trailing of the dynamic picture of the liquid crystal display panel, which comprises the following steps:
s1: when driving to the nth frame, if a brightness difference exists between the (n-1) th frame and the nth frame, starting a first OD table;
s2: when driving to the (n +1) th frame, if the luminance of the (n) th frame is less than the luminance of the (n-1) th frame and the luminance of the (n) th frame is equal to the luminance of the (n +1) th frame, the second OD table is driven.
Further, the step S1 further includes: if there is no luminance difference between the n-1 th frame and the nth frame, the first OD table is not activated.
Further, the step S2 further includes: and if the brightness of the nth frame is not less than the brightness of the (n-1) th frame and the brightness of the nth frame is equal to the brightness of the (n +1) th frame, starting the first OD table if the brightness of the nth frame is not equal to the brightness of the (n +1) th frame.
Further, the step S2 further includes: if the luminance of the nth frame is not less than the luminance of the (n-1) th frame and the luminance of the nth frame is equal to the luminance of the (n +1) th frame, if the luminance of the nth frame is equal to the luminance of the (n +1) th frame, no OD table is started.
According to the invention, the first frame OD and the second frame of the dynamic frame are subjected to OD actions through the first OD table and the second OD table, so that the liquid crystal cross pressure is increased to quickly recover the liquid crystal, the phenomenon of brightness reduction of the second frame caused by over-strong first frame OD is improved, and display blacking is improved.
Drawings
FIG. 1 is a schematic diagram of an OD table of a conventional LCD panel;
FIG. 2 is a waveform diagram illustrating brightness of a conventional LCD panel;
FIG. 3 is a waveform diagram of brightness of a pixel N of a conventional LCD panel;
FIG. 4 is a waveform diagram of the brightness of a pixel N +1 of a conventional LCD panel;
FIG. 5 is a schematic view of a liquid crystal display panel according to the present invention;
FIG. 6 is a schematic diagram of a second OD table of the LCD panel according to the present invention;
FIG. 7 is a flow chart illustrating the driving method of the present invention;
FIG. 8 is a waveform of brightness of a pixel N of an LCD panel according to the present invention;
FIG. 9 is a waveform diagram of the brightness of the pixel N +1 of the LCD panel according to the present invention.
Detailed Description
The present invention is further illustrated by the following figures and specific examples, which are to be understood as illustrative only and not as limiting the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which may occur to those skilled in the art upon reading the present specification.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
As shown in fig. 5, the lcd panel includes a timing controller (Tcon)10, a Level Shifter (LS) 20, a Source driver IC 30, a plurality of gate lines 50, a plurality of data lines 60, and a multi-row gate driving circuit (GDM) 40. The gate lines 50 and the data lines 60 are located in the display area of the display panel and distributed in a crisscross manner; the gate driving circuits 40 are located on two opposite side surfaces inside the liquid crystal display panel, the gate driving circuits 40 are used for inputting driving signals to the gate lines 50, and each gate line 50 corresponds to one gate driving circuit 40; the source driver chip 30 is externally connected to the other side of the lcd panel for inputting driving signals to the data lines 60; the timing controller 10 is configured to output a gate control signal (GCTL), a gate clock signal (GCK), and a start pulse signal (GSP) to the level shifter 20, and the level shifter 20 receives the signals, performs voltage conversion on the signals, and outputs the converted signals to the gate driving circuit (GDM)40, and in addition, the timing controller 10 may directly output a detection signal (TP), a polarity control signal (POL), and a data signal (data) to the source driving chip 30.
Two sets of OD tables, i.e., a first OD table and a second OD table, are provided in the timing controller (Tcon)10, and the first OD table and the second OD table divide 255 steps into x in equal proportion, where x is 17 in this embodiment.
Wherein the first OD table is used for the first frame (i.e. random one frame) of gray scale change to start normally, i.e. the falling phase (e.g. from 128 to 96) and the rising phase (rising, e.g. from 96 to 128) of gray scale change; the second OD table start-up needs to satisfy the following conditions: two adjacent frames after the falling phase (falling) of the gray scale change show the same brightness, and the second OD table is only applied to the frame after the falling phase (falling) of the gray scale change and not applied to the frame after the rising phase (rising).
The first OD table is shown in fig. 1, and the gray scale value from the previous frame (n-1) to the current frame n is changed (actually, whether the gray scale value is increased or decreased is determined according to the characteristics of the panel) to change the driving voltage (when the gray scale value is increased, the driving voltage is increased, and when the gray scale value is decreased, the driving voltage is decreased). Namely: if the gray-scale luminance of the previous frame (n-1) is not equal to the gray-scale luminance of the current frame n, the first OD table is executed, as shown in fig. 1, if the gray-scale luminance of the previous frame (n-1) is 16 and the gray-scale luminance of the current frame n is also 16, the first OD table is still outputting the gray-scale value 16 although it is active, and the actual first OD table plays a role of overdrive under the condition that the gray-scale luminance of the previous frame (n-1) is equal to the gray-scale luminance of the current frame n.
The gray scale value of the current frame n-1 cut to the current frame n is decreased (it is actually determined whether the gray scale value is increased or decreased according to the characteristics of the panel), thereby decreasing the driving voltage.
The second OD table is shown in fig. 6, the gray scale value of the previous frame n to the current frame n +1 is changed (actually, whether the gray scale value is increased or decreased is determined according to the characteristics of the panel), so as to change the driving voltage (when the gray scale value is increased, the driving voltage is increased, and when the gray scale value is decreased, the driving voltage is decreased), for example, when the gray scale frame is switched from 16 gray scales to 16 gray scales, the value of 16 gray scales → 16 gray scales in the second OD table is 15, and then the pixel voltage corresponding to the 15 gray scales is output, so that the liquid crystal can be rapidly rotated to the angle corresponding to the 16 gray scales, and the frame displays no black or white.
And executing the second OD table under the condition that the starting condition of the first OD table is met and the gray-scale brightness of the previous frame n is the same as the gray-scale brightness of the current frame n + 1. If the gray-scale luminance of the previous frame n is 16 and the gray-scale luminance of the current frame n +1 is 16, the second OD table is activated and outputs the gray-scale value 15, which plays a role of overdriving.
The first frame dynamic picture starts a corresponding OD table, the second frame dynamic picture is judged according to the condition of the previous frame, if the brightness is consistent and the high brightness is changed into the low brightness, the second OD table is started to increase the liquid crystal cross pressure to enable the liquid crystal to rotate to a corresponding angle quickly, the phenomenon that the brightness of the second frame is reduced due to the fact that the OD of the first frame is too strong is improved, and the problem of trailing of the dynamic pictures is solved.
Fig. 7 is a schematic diagram illustrating improvement of the dynamic streaking of the lcd panel, where G represents brightness.
A method for improving the trailing of the dynamic picture of a liquid crystal display panel comprises the following steps:
s1: when driving to the nth frame, if there is a luminance difference between the (n-1) th frame and the nth frame (i.e. G (F (n-1)) ≠ G (F (n)))), starting a first OD table; if the brightness difference does not exist between the n-1 th frame and the nth frame, not starting the first OD table;
s2: when driving to the (n +1) th frame, if the luminance of the (n) th frame < the luminance of the (n-1) th frame (i.e., G (F (n-1)) > G (F (n))) and the luminance of the (n) th frame equals the luminance of the (n +1) th frame (i.e., G (F (n)) > G (F (n +1)), the second OD table is driven.
Wherein the step S1 further includes: if there is no luminance difference between the n-1 th frame and the nth frame, the first OD table is not activated.
Wherein the step S2 further includes: if the luminance of the nth frame is not satisfied to be less than the luminance of the (n-1) th frame and the luminance of the nth frame is equal to the luminance of the (n +1) th frame, if the luminance of the nth frame is not equal to the luminance of the (n +1) th frame (i.e., G (F (n +1)) ≠ G (F (n))), the first OD table is started.
Wherein the step S2 further includes: if the luminance of the nth frame is not less than the luminance of the (n-1) th frame and the luminance of the nth frame is equal to the luminance of the (n +1) th frame, if the luminance of the nth frame is equal to the luminance of the (n +1) th frame, no OD table is started.
The present invention debugs the first OD table shown in fig. 1 and the second OD table shown in fig. 6 according to the characteristics of the panel, and the timing controller (Tcon)10 determines the change of the frame to make the corresponding OD action according to the above method.
Fig. 8 is a schematic diagram showing gray scale change in the display condition of the pixel N, where negative polarity of 255 is switched to positive polarity of OD (10), and Δ V255< Δ V10, Vlc10+ × ═ V10+ - (Vcom + Δ V ↓), the luminance at the end of the first frame (Fn) exceeds L96, which is assumed to be L102. The positive polarity is switched to the negative polarity OD (100) from OD (10), because Δ V102< Δ V100, Vlc100 ↓ Vcom + Δ V ↓ -V100-is approximately equal to Vlc96, and the luminance of the second frame (F (n +1)) is reduced to L96.
Fig. 9 is a schematic diagram of gray scale change of the display condition of the pixel N +1, switching from 255 positive polarity to OD (10) negative polarity, because Δ V255< Δ V10, Vlc10 ↓ Vcom + Δ V ↓ -V10-, and the brightness at the end of the first frame (Fn) is lower than L96, assumed to be L80. The OD (10) negative polarity is switched to the OD (100) positive polarity. Because Δ V80> Δ V100, Vlc100+ ↓ (V100 + - (Vcom + Δ V ↓) is approximately equal to Vlc 96.
The second frame (F (n +1)) luminance rises to L96. The integrated display luminance second frame (F (n +1)) is close to the target luminance.
According to the invention, the first frame OD and the second frame of the dynamic frame are subjected to OD actions through the first OD table and the second OD table, so that the liquid crystal cross pressure is increased to quickly recover the liquid crystal, the phenomenon of brightness reduction of the second frame caused by over-strong first frame OD is improved, and display blacking is improved.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the foregoing embodiments, and various equivalent changes (such as number, shape, position, etc.) may be made to the technical solution of the present invention within the technical spirit of the present invention, and these equivalent changes are all within the protection scope of the present invention.
Claims (7)
1. A liquid crystal display panel, it includes the time schedule controller, its characterized in that: a first OD table and a second OD table are arranged in the time sequence controller, wherein the first OD table is normally started in a first frame of gray scale change, and the second OD table is started in a next frame of a descending stage of gray scale change; executing a first OD table under the condition that the gray scale brightness of the previous frame n-1 is not the same as the gray scale brightness of the current frame n; executing a second OD table under the condition that the starting of the first OD table is met and the gray scale brightness of the previous frame n is the same as the gray scale brightness of the current frame n + 1; the second OD table start-up needs to satisfy the following conditions: the two adjacent frames display the same brightness after the descending stage of the gray scale change.
2. The liquid crystal display panel according to claim 1, characterized in that: the first OD table is normally started in the first frame of the falling phase and the rising phase of the gray scale change.
3. The liquid crystal display panel according to claim 1, characterized in that: the first OD table and the second OD table are divided in equal proportion according to the same proportion.
4. A method for improving the trailing of the dynamic picture of a liquid crystal display panel is characterized by comprising the following steps:
s1: when driving to the nth frame, if a brightness difference exists between the (n-1) th frame and the nth frame, starting a first OD table;
s2: when driving to the (n +1) th frame, if the luminance of the (n) th frame is less than the luminance of the (n-1) th frame and the luminance of the (n) th frame is equal to the luminance of the (n +1) th frame, the second OD table is driven.
5. The method for improving the trailing of the dynamic picture of the LCD panel according to claim 4, wherein the step S1 further comprises: if there is no luminance difference between the n-1 th frame and the nth frame, the first OD table is not activated.
6. The method for improving the trailing of the dynamic picture of the LCD panel according to claim 4, wherein the step S2 further comprises: and if the brightness of the nth frame is not less than the brightness of the (n-1) th frame and the brightness of the nth frame is equal to the brightness of the (n +1) th frame, starting the first OD table if the brightness of the nth frame is not equal to the brightness of the (n +1) th frame.
7. The method for improving the trailing of the dynamic picture of the LCD panel according to claim 4, wherein the step S2 further comprises: if the luminance of the nth frame is not less than the luminance of the (n-1) th frame and the luminance of the nth frame is equal to the luminance of the (n +1) th frame, if the luminance of the nth frame is equal to the luminance of the (n +1) th frame, no OD table is started.
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| CN111613188B (en) * | 2020-06-28 | 2023-08-25 | 京东方科技集团股份有限公司 | Display panel driving method, display panel and display device |
| US20240119912A1 (en) * | 2021-03-22 | 2024-04-11 | Wuhan Boe Optoelectronics Technology Co.,Ltd. | Driving method for liquid crystal display panel and non-transitory computer-readable storage medium |
| CN113160734B (en) * | 2021-04-07 | 2022-11-01 | Tcl华星光电技术有限公司 | Time schedule controller and polarity gray scale compensation method |
| CN113903305B (en) * | 2021-09-30 | 2023-09-26 | 昆山国显光电有限公司 | Display control method, device, chip, apparatus, storage medium, and program product |
| CN113963670B (en) * | 2021-10-29 | 2023-08-29 | 武汉京东方光电科技有限公司 | Driving method of display panel, display panel and display device |
| CN115019726B (en) * | 2021-12-24 | 2023-05-16 | 荣耀终端有限公司 | Picture display method, electronic device, and readable storage medium |
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Effective date of registration: 20200827 Address after: No.7 Tianyou Road, Qixia District, Nanjing City, Jiangsu Province Applicant after: NANJING CEC PANDA LCD TECHNOLOGY Co.,Ltd. Address before: Nanjing Crystal Valley Road in Qixia District of Nanjing City Tianyou 210033 Jiangsu province No. 7 Applicant before: NANJING CEC PANDA LCD TECHNOLOGY Co.,Ltd. Applicant before: NANJING CEC PANDA FPD TECHNOLOGY Co.,Ltd. Applicant before: Nanjing East China Electronic Information Technology Co.,Ltd. |
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