CN107093410B - Liquid crystal display brightness regulation and control method and device and liquid crystal display screen - Google Patents
Liquid crystal display brightness regulation and control method and device and liquid crystal display screen Download PDFInfo
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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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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Abstract
The invention provides a method for regulating and controlling the brightness of liquid crystal display, which comprises the following steps: the dividing liquid crystal display screen is composed of a middle display area and 2n edge display areas which are distributed on two sides of the middle area, wherein n is an integer which is more than or equal to 1; outputting display data of a frame of picture currently displayed in the middle display area and the 2n edge display areas to a display screen driving unit for carrying out display picture gray scale detection; performing gray scale distribution calculation according to the detected gray scale data of each area of the display picture; determining the whole gray scale of each region according to the detected gray scale distribution of each region, setting the common voltage of each region according to the whole gray scale of each region, and respectively applying the common voltage determined by the region to each region of the liquid crystal display screen; returning to the detection section to detect the next frame.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a method and a device for regulating and controlling the brightness of a liquid crystal display and a liquid crystal display screen.
Background
In a dual-side odd-even driving lcd (liquid Crystal display) architecture, due to the delay of the data signal line circuit, the charging level of the pixels at the edge of the display screen is not uniform. As shown in fig. 1, the two positions a \ B have the largest signal delay and the worst pixel charging condition due to the signal tail end of the second row. In the prior art, the adjustment of the optimal VCOM of the LCD panel is mostly performed only for the middle gray level of the display panel, and the common voltage in the middle region is used as the optimal common voltage VCOM of the entire LCD panel. It is well known that the voltage actually applied to a display Pixel is the difference between the Pixel voltage and the common electrode voltage VCOM. The display luminance varies due to the difference in voltage between the middle region and the edge region, and when the luminance difference reaches a certain value, the human eye feels that so-called flicker is formed, which causes display defects.
Disclosure of Invention
The invention provides a liquid crystal display brightness regulation and control method and device for avoiding flicker caused by voltage difference.
The application discloses a method for regulating and controlling liquid crystal display brightness, which comprises the following steps:
the dividing liquid crystal display screen is composed of a middle display area and 2n edge display areas which are uniformly distributed on two sides of the middle area, wherein n is an integer which is more than or equal to 1;
outputting display data of a frame of picture currently displayed in the middle display area and the 2n edge display areas to a display screen driving unit for carrying out display picture gray scale detection;
performing gray scale distribution calculation according to the detected gray scale data of each area of the display picture;
determining the whole gray scale of each region according to the detected gray scale distribution of each region, and setting the common voltage of each region according to the whole gray scale of each region,
applying the common voltage determined by the region to each region of the liquid crystal display screen;
returning to the detection section to detect the next frame.
The step of outputting display data of a frame of picture currently displayed in the middle display area and the 2n edge display areas to a display screen driving unit for detecting the gray scale of the display picture comprises the following steps: the display screen mainboard transmits the image display data to the display screen driving chip, and the display image detection module of the display screen driving chip detects the gray scale distribution of the display image data.
And performing gray scale distribution calculation according to the detected display image data of each area of the display image to obtain a gray scale value of the pixel of each area.
The setting of the common voltage of each region according to the overall gray scale of each region refers to selecting an optimal voltage value in the common voltage corresponding to the gray scale corresponding to the region.
The dividing liquid crystal display screen is divided into a middle display area and 2n edge display areas which are distributed on two sides of the middle area through displaying the brightness difference between the middle area and the two side areas of the picture.
The middle display area and the 2n edge display areas input the same voltage value or different voltage values through signal lines.
The invention relates to a liquid crystal display brightness control device, which comprises a driving device, a display picture detection module, a gray scale calculation module and a gray scale setting module;
the driving device is used for dividing and outputting display data of a frame of picture currently displayed in the middle display area and the 2n edge display areas to a display screen driving chip;
the display picture detection module is used for carrying out display picture gray scale detection on display data input into the display screen driving chip;
the gray scale calculation module performs gray scale distribution calculation according to the detected display picture data of each area of the display picture;
the gray level setting module determines the whole gray level of each region according to the detected gray level distribution of each region, and sets the common voltage of each region according to the whole gray level of each region,
applying the common voltage determined by the region to each region through the driving device; then go back to the detection section to detect the next frame.
The driving device comprises a data module for transmitting display data, a detection unit for detecting the brightness difference between the middle display area and the two side areas, and a control module for controlling the display picture detection module, the gray scale calculation module and the gray scale setting module.
The liquid crystal display comprises the liquid crystal display brightness regulating and controlling device.
The method for regulating and controlling the brightness of the liquid crystal display successfully solves the phenomenon of display flicker caused by different driving voltages in the LCD framework with double-side GOA odd-even driving, and improves the display quality of the LCD.
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To more clearly illustrate the structural features and effects of the present invention, a detailed description is given below with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of a part of the structure of the method for adjusting and controlling the brightness of the liquid crystal display according to the present invention.
FIG. 2 is a schematic diagram of a method for controlling brightness of a liquid crystal display according to the present invention.
FIG. 3 is a flow chart of a pressing method for adjusting and controlling the brightness of the LCD according to the present invention.
FIG. 4 is a distribution diagram of gray scale levels of each area of the LCD panel according to the present invention.
FIG. 5 is a block diagram of the LCD brightness control device according to the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The drawings are for illustrative purposes only and are merely schematic representations, not intended to limit the present patent.
The invention provides a method for regulating and controlling the Display brightness of a Liquid Crystal Display (LCD), which is used for regulating and controlling the uneven Display brightness of a Display screen, in particular a Liquid Crystal Display (LCD) driven by double-side GOA odd-even. Referring to fig. 2 and fig. 3, the adjusting method includes:
in step S1, the divided liquid crystal display screen 100 is a middle display area 1 and 2n and an edge display area 2 distributed on both sides of the middle area, where n is an integer greater than or equal to 1.
The division liquid crystal display screen 100 is formed by dividing a middle display area 1 and 2n and edge display areas 2 distributed on both sides of the middle area by displaying the brightness difference between the middle area 1 and the edge display areas 2 on both sides of the display screen.
Further, the middle display area a and the 2n edge display areas B input the same voltage value or different voltage values through signal lines. When the brightness of the display screen does not need to be adjusted, the voltages are input to the signal lines of the middle display region 1 and the 2n edge display regions 2 the same. When the brightness needs to be adjusted, the input voltage of the signal lines of the middle display area 1 and the 2n edge display areas 2 is the voltage confirmed by the method.
Step S2, outputting the display data of the frame currently displayed in the middle display area and the 2n edge display areas to the display screen driving unit for detecting the gray scale of the display screen. The method mainly comprises the steps of obtaining gray scale distribution of all areas of a display picture; for example, the gray scale distribution of RGB pixels of one pixel unit is consistent with the gray scale distribution of pixels of the whole area. Specifically, the display screen mainboard transmits the image display data to the display screen driving chip, and the display image detection module of the display screen driving chip detects the gray scale distribution of the display image data.
In step S3, gray scale distribution calculation is performed according to the detected gray scale data of each region of the display screen. Specifically, the gray scale value of the pixel of each region is obtained in this step. Actually, the picture content of each region is different, and the gray scales of the pixels in the region are different, and this step will count the gray scale distribution of each partition on the display screen.
In step S4, the overall gray level of each region is determined according to the detected gray level distribution of each region, and the common voltage of each region is set according to the overall gray level of each region. The deflection angle of the liquid crystal is related to the display gray scale. The final conclusion is: the optimum voltage value varies with the gray scale. Therefore, the optimal voltage value needs to be determined by detecting the gray distribution of the picture to be displayed; for example, if the gray scale distribution of the edge display region 2 in fig. 2 is the region 1 in fig. 4, it is indicated that most of the sub-pixels at the edge of the display screen of the picture are biased to the gray scale of 0, and at this time, the pixel value a is calculated, so that the final gray scale of the region can be defined as the gray scale of a. Setting the common voltage of each region according to the overall gray scale of each region refers to selecting the optimal voltage value of the common voltages corresponding to the gray scale corresponding to the region. For example, if the final gray scale of the region is defined as the gray scale a in this step, the optimal voltage value corresponding to the gray scale a is defined as the optimal voltage of the region;
in step S5, the common voltage determined by the region is applied to each region of the liquid crystal display panel 100.
In step S6, the detecting section detects the next frame.
The method for regulating and controlling the brightness of the liquid crystal display successfully solves the phenomenon of display flicker caused by different driving voltages in the LCD framework with double-side GOA odd-even driving, and improves the display quality of the LCD.
Referring to fig. 5, the present invention further provides a liquid crystal display brightness control device, which includes a driving device 10, a display frame detecting module 12, a gray scale calculating module 14, and a gray scale setting module 16. In summary, the display frame detection module 12, the gray level calculation module 14 and the gray level setting module 16 are disposed in the display screen driving chip.
The driving device 10 is configured to divide and output display data of a frame currently displayed in the middle display area and the 2n edge display areas to a display screen driving chip. The driving device 10 is disposed on the display main board, and includes a data module for transmitting display data, a detection unit for detecting a brightness difference between the middle display area and the two side display areas, and a control module for controlling the display image detection module, the gray scale calculation module, and the gray scale setting module.
The display image detection module 12 performs display image gray scale detection on display data input to the display screen driving chip.
The gray scale calculation module 14 performs gray scale distribution calculation according to the detected gray scale data of each region of the display frame.
The gray level setting module 16 determines the overall gray level of each region according to the detected gray level distribution of each region, and sets the common voltage of each region according to the overall gray level of each region.
Applying the common voltage determined by the region to each region through the driving device; then go back to the detection section to detect the next frame.
The invention also provides a liquid crystal display which comprises the liquid crystal display brightness regulating and controlling device and is used for regulating and controlling the brightness uniformity of the display picture of the liquid crystal display.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (7)
1. A method for regulating and controlling the brightness of a liquid crystal display is characterized by comprising the following steps:
the dividing liquid crystal display screen is composed of a middle display area and 2n edge display areas which are uniformly distributed on two sides of the middle area, wherein n is an integer which is more than or equal to 1;
inputting the same voltage value or different voltage values to the middle display area and the 2n edge display areas, wherein the same voltage value or different voltage values are input through signal lines; when the brightness of the display picture does not need to be adjusted, the input voltages of the signal lines of the middle display area and the 2n edge display areas are the same;
when the brightness needs to be adjusted, outputting display data of a frame of picture currently displayed in the middle display area and the 2n edge display areas to a display screen driving unit for carrying out display picture gray scale detection;
performing gray scale distribution calculation according to the detected gray scale data of each area of the display picture to obtain the gray scale value of the pixel of each area;
determining the whole gray scale of each region according to the detected gray scale distribution of each region, and setting the common voltage of each region according to the whole gray scale of each region,
applying the common voltage determined by the region to each region of the liquid crystal display screen;
returning to the detection section to detect the next frame.
2. The method as claimed in claim 1, wherein outputting the display data of the frame currently displayed in the middle display region and the 2n edge display regions to the display driving unit for displaying gray level detection comprises: the display screen mainboard transmits the image display data to the display screen driving chip, and the display image detection module of the display screen driving chip detects the gray scale distribution of the display image data.
3. The method as claimed in claim 1, wherein the setting of the common voltage for each region according to the overall gray scale of each region is performed by selecting an optimal voltage value of the common voltage corresponding to the gray scale distribution corresponding to the region.
4. The method according to any one of claims 1 to 3, wherein the dividing of the liquid crystal display screen into a middle display area and 2n edge display areas which are distributed on both sides of the middle area is performed by dividing a display screen by a luminance difference between the middle area and the two side areas.
5. A liquid crystal display brightness control device is characterized by comprising a driving device, a display picture detection module, a gray scale calculation module and a gray scale setting module;
the driving device is used for dividing and outputting display data of a frame of picture currently displayed in the middle display area and the 2n edge display areas to the display screen driving chip;
the display picture detection module is used for carrying out display picture gray scale detection on display data input into the display screen driving chip;
the gray scale calculation module performs gray scale distribution calculation according to the detected display picture data of each area of the display picture;
the gray level setting module determines the whole gray level of each region according to the detected gray level distribution of each region, and sets the common voltage of each region according to the whole gray level of each region,
applying the common voltage determined by the region to each region through the driving device; then go back to the detection section to detect the next frame.
6. The device as claimed in claim 5, wherein the driving device comprises a data module for transmitting display data, a detecting unit for detecting the brightness difference between the middle display region and the two side regions, and a control module for controlling the display frame detecting module, the gray scale calculating module and the gray scale setting module.
7. A liquid crystal display comprising the liquid crystal display luminance controlling device according to any one of claims 5 to 6.
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| CN107767808B (en) | 2017-11-13 | 2020-09-08 | 北京京东方光电科技有限公司 | Display panel driving method, display driving circuit and display device |
| CN108597428A (en) * | 2018-04-28 | 2018-09-28 | 惠州市华星光电技术有限公司 | Driving voltage adjustment method and liquid crystal display |
| CN108922484A (en) * | 2018-07-17 | 2018-11-30 | 上海摩软通讯技术有限公司 | Display screen display optimization method, system and terminal |
| CN111445823A (en) * | 2020-05-07 | 2020-07-24 | 南京中电熊猫液晶显示科技有限公司 | Liquid crystal display panel and method for correcting burn-in failure thereof |
| CN113223415A (en) * | 2021-04-10 | 2021-08-06 | 京东方科技集团股份有限公司 | Spliced display screen, liquid crystal deflection voltage adjusting method and display adjusting method |
| CN116092439B (en) * | 2023-04-10 | 2023-06-23 | 惠科股份有限公司 | Liquid crystal display device and electronic apparatus |
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| US20070109468A1 (en) * | 2005-11-15 | 2007-05-17 | Toppoly Optoelectronics Corp. | Systems with reduced color lines at edges of associated display devices |
| US7696968B2 (en) * | 2006-12-27 | 2010-04-13 | Au Optronics Corporation | Liquid crystal display apparatus with color sequential display and method of driving the same |
| CN101944334A (en) * | 2009-07-07 | 2011-01-12 | 华映视讯（吴江）有限公司 | Driving method of LCD |
| KR102105329B1 (en) * | 2013-12-31 | 2020-04-29 | 삼성디스플레이 주식회사 | Display device and driving method thereof |
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