CN117292653B - Data processing method and backlight display system - Google Patents
Data processing method and backlight display system Download PDFInfo
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- CN117292653B CN117292653B CN202311279546.0A CN202311279546A CN117292653B CN 117292653 B CN117292653 B CN 117292653B CN 202311279546 A CN202311279546 A CN 202311279546A CN 117292653 B CN117292653 B CN 117292653B
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- 238000013507 mapping Methods 0.000 claims description 28
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- 239000000758 substrate Substances 0.000 claims 2
- 239000004973 liquid crystal related substance Substances 0.000 description 45
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
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Classifications
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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
- G09G3/3406—Control of illumination source
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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
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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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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- 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
Abstract
The embodiment of the application provides a data processing method and a backlight display system, wherein a control chip obtains original backlight driving data of each frame driving period, counts the number of white areas displayed by a backlight circuit board in each frame driving period according to original gray data of a plurality of backlight areas on the backlight circuit board in the original backlight driving data, and determines a dimming coefficient in a corresponding frame driving period so as to adjust the original backlight driving data, generate target backlight driving data and drive each backlight area of the backlight circuit board to generate corresponding brightness, thereby improving contrast.
Description
Technical Field
The embodiment of the application relates to the field of LED display, in particular to a data processing method and a backlight display system.
Background
With the development of display technology, mini LEDs have become a research hotspot of display devices due to the advantages of energy saving, simple mechanism, small size, thin shape and the like.
The liquid crystal display device comprises a control chip, a backlight circuit and a liquid crystal display screen, wherein the backlight circuit provides backlight when the liquid crystal display screen displays pictures. In the prior art, a backlight circuit provides normally-on backlight by using a side-in type or direct type cold cathode fluorescent lamp, and brightness adjustment of a display screen of a liquid crystal display device is adjusted by adjusting the opening and closing time of each liquid crystal molecule on the liquid crystal display screen in each frame of display period. Because the liquid crystal molecules have the light leakage phenomenon, when a pure black picture is displayed, even if each liquid crystal molecule on the liquid crystal display screen is kept in a closed state all the time in the whole frame display period, certain brightness can be displayed, so that the brightness difference between the pure black and the pure white is smaller, the contrast of the display picture is low, and the display effect is poor.
The backlight circuit board adopts local backlight adjustment to improve the problems, namely, a backlight unit is divided into a plurality of backlight areas, a main controller of the liquid crystal display device provides backlight brightness signals corresponding to the backlight areas for the liquid crystal display device, so that each backlight area provides different backlight brightness, and the display brightness of each pixel in a display picture is adjusted by combining the turnover condition of liquid crystal molecules positioned at the front side.
Since the liquid crystal display device cannot modify the process of generating the backlight luminance signal by the liquid crystal display driving system according to the display data, how to further improve the contrast of the display screen based on the backlight luminance signal obtained by the liquid crystal display device is an important point of research.
Disclosure of Invention
The application provides a data processing method and a backlight display system, which are used for solving the technical problem of low contrast of a display picture of a liquid crystal display device.
In a first aspect, an embodiment of the present application provides a data processing method, where the method is applied to a control chip, and the method includes:
obtaining original backlight driving data of each frame driving period; the original backlight driving data comprises original gray data of a plurality of backlight areas on a backlight circuit board;
counting the number of white areas in a backlight circuit board according to the original backlight driving data; the white area is a backlight area with original gray data larger than a preset gray threshold value;
determining a dimming coefficient according to the number of white areas and the number of backlight areas on the backlight circuit board;
and generating target backlight driving data according to the dimming coefficient and the original gray data of the backlight area.
In the above technical solution, the control chip obtains the original backlight driving data of each frame driving period, and counts the number of white areas displayed in each frame driving period by the backlight circuit board according to the original gray data of a plurality of backlight areas on the backlight circuit board in the original backlight driving data, so as to determine the dimming coefficient in the corresponding frame driving period, thereby adjusting the original backlight driving data, generating the target backlight driving data, and driving each backlight area of the backlight circuit board to generate the corresponding brightness, so as to improve the contrast ratio.
Optionally, determining the dimming coefficient according to the number of white areas and the number of backlight areas on the backlight circuit board includes:
calculating the ratio of the number of white areas to the number of backlight areas on the backlight circuit board;
according to the dimming mapping table, a dimming coefficient corresponding to the ratio is obtained;
the dimming mapping table stores at least one mapping relation between a preset ratio and a corresponding dimming coefficient.
Optionally, the at least one preset ratio includes a preset peak value ratio and at least one first preset ratio, and a dimming coefficient corresponding to the preset peak value ratio is greater than a dimming coefficient corresponding to the first preset ratio;
the dimming coefficient corresponding to the preset peak value ratio is larger than 1.
Optionally, in the dimming mapping table, the larger the absolute value of the difference between the first preset ratio and the preset peak ratio is, the larger the difference between the dimming coefficient corresponding to the preset peak ratio and the dimming coefficient corresponding to the first preset ratio is.
Optionally, the at least one first preset ratio comprises a preset low gray scale ratio and at least one second preset ratio;
when the second preset ratio is smaller than the preset low gray scale ratio, the dimming coefficient corresponding to the second preset ratio is smaller than 1.
In the above technical solution, according to the ratio of the white area to the total amount of backlight areas in the backlight circuit board, determining the high brightness distribution condition of the display screen in the current frame driving period, thereby determining the corresponding dimming coefficient, wherein when the ratio is greater than or equal to the preset low gray scale ratio, the dimming coefficient corresponding to the ratio is greater than or equal to 1, and the smaller the absolute value of the difference between the ratio and the preset peak value ratio is, the greater the dimming coefficient corresponding to the ratio is, so as to adaptively improve the display brightness of the target backlight area in the backlight circuit board, and the difference between the low gray scale display brightness and the high gray scale display brightness is increased, thereby improving the contrast ratio; when the ratio is smaller than the preset low gray scale ratio, the dimming coefficient is smaller than 1, the display brightness of a target backlight area in the backlight circuit board is reduced, the light leakage brightness of the liquid crystal display screen is reduced, and the display effect of a black picture is improved.
Optionally, the original gray data includes original current data or original PWM data, and the preset gray threshold includes a preset current threshold or a preset PWM threshold;
counting the number of white areas in the backlight circuit board according to the original backlight driving data, including:
counting the number of original current data which is larger than a preset current threshold value in original backlight driving data, and determining the number as the number of white areas in a backlight circuit board;
or alternatively
And counting the number of the original PWM data which is larger than a preset PWM threshold value in the original backlight driving data, and determining the number as the number of the white areas in the backlight circuit board.
Optionally, the original gray data includes original current data and original PWM data, and the preset gray threshold includes a preset PWM threshold and a preset current threshold;
counting the number of white areas in the backlight circuit board according to the original backlight driving data, including:
and counting the number of the original gray scale data in which the original PWM data is larger than a preset PWM threshold value and the original current data is larger than the preset current threshold value in the original backlight driving data, and determining the number as the number of the white areas in the backlight circuit board.
Optionally, the original backlight driving data includes original gray data of a white area and original gray data of other backlight areas;
generating target backlight driving data according to the dimming coefficient and the original gray data of the backlight area, including:
adjusting the original gray data of the white area according to the dimming coefficient to generate target gray data;
and generating target backlight driving data according to the target gray data and the original gray data of other backlight areas.
Optionally, the raw gray data includes raw current data and/or raw PWM data;
adjusting the original gray data of the white area according to the dimming coefficient to generate target gray data, including:
when the original gray data includes only the original current data, determining a product of the original current data and the dimming coefficient as target current data among the target gray data;
when the original gray data only comprises the original PWM data, determining the product of the original PWM data and the dimming coefficient as target PWM data in the target gray data;
when the original gray data includes current data and PWM data, a product of the original current data, the original PWM data, and the dimming coefficient is determined as a product of target gray data, target current data, and target PWM data.
In a second aspect, embodiments of the present application provide a backlight display system, including:
the control chip and the backlight circuit comprise a plurality of backlight areas;
the control chip is electrically connected with each backlight area;
the control chip obtains original backlight driving data of each frame driving period; the original backlight driving data comprises original gray data of a plurality of backlight areas on a backlight circuit board;
the control chip counts the number of white areas in the backlight circuit board according to the original backlight driving data; the white area is a backlight area with original gray data larger than a preset gray threshold value;
the control chip determines a dimming coefficient according to the number of white areas and the number of backlight areas on the backlight circuit board;
and the control chip generates target backlight driving data according to the dimming coefficient and the original gray data of the backlight area.
According to the data processing method and the backlight display system provided by the embodiment of the application, the control chip obtains the original backlight driving data of each frame driving period, and counts the number of the white areas displayed by the backlight circuit board in each frame driving period according to the original gray data of a plurality of backlight areas on the backlight circuit board in the original backlight driving data, so that the dimming coefficient in the corresponding frame driving period is determined, the original backlight driving data is adjusted, the target backlight driving data is generated, and each backlight area of the backlight circuit board is driven to generate corresponding brightness so as to improve the contrast ratio.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
FIGS. 1A and 1B are two circuit block diagrams of a display provided in accordance with an exemplary embodiment of the present application;
fig. 2 is a circuit configuration diagram of a display unit provided according to an exemplary embodiment of the present application;
FIG. 3 is a flow chart of a method for data processing according to an exemplary embodiment of the present application;
fig. 4 is a flowchart of a dimming coefficient determination method according to an exemplary embodiment of the present application;
FIG. 5 is a schematic diagram of white area distribution provided in accordance with an exemplary embodiment of the present application;
FIG. 6 is a flowchart of a method for generating target backlight driving data according to an exemplary embodiment of the present application;
fig. 7 is a graph of a ratio of white area to dimming coefficient and backlight area current in a backlight circuit board according to an exemplary embodiment of the present application.
Specific embodiments thereof have been shown by way of example in the drawings and will herein be described in more detail. These drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The display system is a system composed of an imaging system and a display driving system, wherein the display driving system comprises a backlight driving system and a liquid crystal display driving system, the imaging system comprises a backlight circuit board and a liquid crystal display panel, and the backlight circuit board is arranged at the rear side of the liquid crystal display panel.
In the prior art, a backlight circuit board provides normally-on backlight by using a side-in type or direct type cold cathode fluorescent lamp, and brightness adjustment of a display screen of a liquid crystal display device is adjusted by adjusting the on and off time of each liquid crystal molecule on the liquid crystal display panel in each frame of display period. Because the liquid crystal molecules have the light leakage phenomenon, when a pure black picture is displayed, even if each liquid crystal molecule on the liquid crystal display screen is kept in a closed state all the time in the whole frame display period, certain brightness can be displayed, so that the brightness difference between the pure black and the pure white is smaller, the contrast of the display picture is low, and the display effect is poor.
In order to improve the above problem, the backlight circuit board adopts local backlight adjustment, that is, divides the backlight unit into a plurality of backlight areas, each backlight area provides different backlight brightness, and adjusts the display brightness of each pixel in the display screen in combination with the inversion condition of the liquid crystal molecules located at the front side.
The principle of local dimming display is explained first, the backlight circuit board is composed of a plurality of light emitting units, the light emitting units are distributed in an array, the liquid crystal display panel is composed of a plurality of liquid crystal display units, the light emitting units and the liquid crystal display units are in corresponding relation, and the light emitting units are located at the rear side of the liquid crystal display units and provide backlight for the liquid crystal display units.
The backlight control system is a driving system for driving the backlight circuit board to emit backlight corresponding to a display picture, determines a backlight brightness signal according to display data, and outputs corresponding backlight driving data to the backlight circuit board according to the backlight brightness signal so that a backlight unit on the backlight circuit board emits corresponding light intensity according to the backlight driving data.
The liquid crystal display driving system is a driving system for driving a display screen of a liquid crystal display panel, and drives the liquid crystal display panel to adjust the state of an internal imaging structure according to obtained display data, and displays the screen when backlight is obtained. Wherein the display data is data acquired from a master control system of the display.
More specifically, the liquid crystal display driving system further adjusts the light intensity actually displayed after the backlight light intensity passes through the liquid crystal molecules by adjusting the on and off time periods of each liquid crystal molecule in the liquid crystal display panel.
The specific circuit configuration of the display is explained in detail below.
Fig. 1A is a circuit structure diagram of a display provided in accordance with an exemplary embodiment of the present application, and as shown in fig. 1A, the display includes a control system, a backlight circuit board 10 and an LCD display screen 40, where the control system is electrically connected to the backlight circuit board 10, and the control system is electrically connected to the LCD display screen 40. The control system generates a driving control signal and transmits the driving control signal to the backlight circuit board 10; the control system generates LCD drive signals for transmission to the LCD display screen 40.
In one embodiment, the control system and the backlight circuit board 10 are electrically connected by a connection structure, i.e., the control system and a first end of the connection structure are electrically connected in a row, and the backlight circuit board 10 and a second end of the connection structure are electrically connected, wherein the connection structure comprises a flexible flat cable (Flexible Flat Cable, abbreviated as FFC), a flexible printed circuit board (Flexible Printed Circuit, abbreviated as FPC), or a connector. The control system transmits a driving control signal to the backlight circuit board 10 through the connection structure.
The control system includes a master controller 30 and at least one dimming controller (dimmer controller) 20, the master controller 30 being electrically connected to each dimming controller 20 for transmitting backlight control signals to the dimming controllers 20.
In one embodiment, each dimming controller 20 is disposed on a corresponding control board, and the master controller 30 is electrically connected to the dimming controller 20 through a circuit structure between the master controller and the control board and a connection line disposed on the control board. The dimming controller 20 is electrically connected with the backlight circuit board 10 through a connection structure.
In another embodiment, each dimming controller 20 is disposed on the backlight circuit board 10, and in one scenario, is disposed along a longitudinal direction at an edge of the backlight circuit board; in another scenario, the backlight circuit board is disposed along a lateral direction at an edge of the backlight circuit board, which is not particularly limited herein. The main controller 30 is electrically connected to each of the dimming controllers 20 through a connection structure and a connection line provided on the backlight circuit board, and each of the dimming controllers 20 is electrically connected to the corresponding backlight unit 101 through a connection line on the backlight circuit board.
The backlight circuit board can be divided into at least one backlight display area, and each backlight display area corresponds to each control board one by one. The main controller 20 generates original backlight driving data from the backlight brightness signal, splits the original backlight driving data according to the backlight display area, and transmits the split original backlight driving data to the corresponding control boards, and each control board drives the backlight display area to emit light according to the obtained original backlight driving data.
More specifically, each backlight display region includes at least one backlight region, each backlight region includes a plurality of backlight units 101, and the control board drives the backlight units 101 to emit light according to original gray-scale data corresponding to an address of each backlight unit 101 in the original backlight driving data.
The circuit structure of the backlight unit 101 includes, as shown in fig. 2, a backlight driving chip 1011 and at least one backlight light source 1012. In one backlight unit 101, a backlight driver 1011 and each backlight light source 1012 are electrically connected.
The backlight driving chip 1011 is electrically connected with the control board 20, and is configured to obtain original backlight driving data transmitted by the control board 20, and generate a corresponding driving signal according to corresponding original gray data in the original backlight driving data. In one embodiment, the backlight driver 1011 is a dimmer (dimmer). The original gray data includes pulse width modulation signals (Pulse Width Modulation, abbreviated as PWM) for adjusting the duty cycle of the light emitting duration of the light emitting source 1012 in a frame of light emitting period and/or driving current signals for adjusting the light emitting brightness of the light emitting source 1012 in an instant.
Each backlight source 1012 is configured to acquire a driving signal and emit light according to the driving signal. More specifically, backlight source 1012 includes a plurality of LEDs, which in one embodiment are electrically connected in parallel. In the backlight source 1012, the driving signals obtained by the LEDs are the same, and the average light emission luminance generated in accordance with the driving signals in one frame light emission period is the same. The LEDs include, but are not limited to, organic light-emitting diodes (OLEDs), mini LEDs, micro-OLEDs.
The main controller 30 is electrically connected to a timing controller (Timing Controller, abbreviated as TCON) 50, and the timing controller 40 is electrically connected to the LCD display 40.
The TCON 50 is used to obtain display data transmitted from the main controller 30, generate LCD driving signals according to the display data, and transmit the LCD driving signals to the LCD display screen 40. Each liquid crystal molecule in the LCD 40 adjusts the motion state according to the LCD driving signal, and displays the picture when the backlight is transmitted.
In another embodiment, as shown in fig. 1B, the main controller 30 is connected to each dimming controller 20 in a different manner than the circuit structure shown in fig. 1A.
In the embodiment shown in fig. 1B, the main controller 30 is electrically connected to the TCON 50, and is configured to transmit a backlight luminance signal to the TCON 50, so that the TCON 50 generates original backlight driving data according to the backlight luminance signal, splits the original backlight driving data into at least one original backlight driving sub-data, and transmits each original backlight driving sub-data to the corresponding dimming controller 20, so that the dimming controller 20 transmits original gray data in the original backlight driving sub-data to the corresponding backlight unit 101, and drives the backlight unit to emit light.
In the operation process of the above two displays, since the liquid crystal display device cannot modify the process of generating the backlight brightness signal by the liquid crystal display driving system according to the display data, how to further improve the contrast of the display screen based on the backlight brightness signal obtained by the liquid crystal display device is an important point of research.
In order to solve the above problems, the present application provides a data processing method and a backlight display system. The technical conception of the application is as follows: when the control chip of the liquid crystal display device obtains original backlight driving data generated according to backlight brightness signals, a dimming coefficient is determined according to the ratio of the area of the original backlight driving data, which drives the backlight circuit board to display white, to the total area, so that the original backlight driving data is adjusted, target driving data is generated, and each area of the backlight circuit board is driven to display corresponding backlight, so that the contrast ratio is improved.
The data processing process of the backlight driving data by the control chip is explained in detail as follows.
Fig. 3 is a schematic flow chart of a data processing method according to an exemplary embodiment of the present application, where an execution body of the method is a control chip, and the control chip is a chip for controlling a backlight light source, in one embodiment, the control chip is a dimming controller 20, in another embodiment, the control chip is an integrated circuit of the dimming controller 20 and each backlight driving chip 1011, and in other embodiments, any circuit including the dimming controller 20 may be used, which is not limited herein specifically.
As shown in fig. 3, the method includes:
s101, obtaining original backlight driving data of each frame driving period.
The original backlight driving data is the backlight driving data which is obtained by the control chip from other control chips or outside and is used for controlling the display of the backlight circuit board.
In the structure shown in fig. 1A, when the control chip is the dimming controller 20, the backlight driving data is driving data transmitted to the control chip by the main controller 30, and the backlight driving data is driving data generated according to the backlight luminance signal after the main controller 30 obtains the backlight luminance signal.
In the configuration shown in fig. 1B, when the control chip is the dimming controller 20, the backlight driving data is driving data transmitted thereto by the TCON 50, and the backlight driving data is driving data generated according to the backlight luminance signal after the TCON 50 obtains the backlight luminance signal from the main controller 30.
The original backlight driving data comprises original gray data of a plurality of backlight areas on the backlight circuit board, and each original gray data corresponds to each backlight area one by one. The original gray data drives the corresponding backlight drive to generate the corresponding light intensity.
S102, counting the number of white areas in the backlight circuit board according to the original backlight driving data.
The white area is a backlight area with original gray data larger than a preset gray threshold value.
S103, determining the dimming coefficient according to the number of white areas and the number of backlight areas on the backlight circuit board.
The dimming coefficient is a coefficient for adjusting the original gray data to the target gray data.
In an embodiment, the raw gray data includes raw PWM data and/or raw current data, and the dimming coefficient is a coefficient for adjusting the raw PWM data and/or the raw current data.
S104, generating target backlight driving data according to the dimming coefficient and the original gray data of the backlight area.
The control chip respectively adjusts part or all of the original gray data in the original backlight driving data by using the dimming coefficient, generates target gray data corresponding to a backlight area corresponding to the original gray data, and generates target backlight driving data according to the target gray data.
In one embodiment, the original gray scale data comprises original PWM data, the target gray scale data comprises target PWM data, and the dimming coefficient is a ratio of the target PWM data to the original PWM data.
In one embodiment, the raw gray data includes raw current data, the target gray data includes target current data, and the dimming coefficient is a ratio of the target current data to the raw current data.
In an embodiment, the original gray data includes original PWM data and original current data, the target gray data includes target PWM data and target current data, and the dimming coefficient is a ratio of a product of the target PWM data and the target current data to a product of the original PWM data and the original current data.
The control chip drives each backlight light source in the backlight circuit board by using the target backlight driving data to generate backlight brightness capable of improving contrast. In an embodiment, the brightness difference value between part or all gray scales is larger in the brightness generated by each backlight light source under the driving of the target backlight driving data, so that the contrast ratio is improved.
In the above technical solution, original backlight driving data of each frame driving period is obtained, and according to original gray data of a plurality of backlight areas on a backlight circuit board in the original backlight driving data, the number of white areas displayed in each frame driving period by the backlight circuit board is counted, so as to determine a dimming coefficient in a corresponding frame driving period, thereby adjusting the original backlight driving data, generating target backlight driving data, and driving each backlight area of the backlight circuit board to generate corresponding brightness, so as to improve contrast ratio.
The following explains a method for determining the dimming coefficient by the control chip.
Fig. 4 is a flowchart of a dimming coefficient determination method according to an exemplary embodiment of the present application. As shown in fig. 4, the method includes:
s201, calculating the ratio of the number of white areas to the number of backlight areas on the backlight circuit board.
The ratio is the quotient of the number of white areas in the backlight circuit board divided by the total number of backlight areas.
The control chip determines the ratio of the number of white areas according to the original gray data in the original backlight driving data.
Fig. 5 is a frame of display screen provided according to an exemplary embodiment of the present application, in which a frame of screen 60 when the sun falls down is displayed, and in the frame of screen 60, a sun 601 and a horizon 602 are included, wherein the sun 601 is a light emitting body, and the original gray data obtained by the displayed area is greater than a preset gray threshold, that is, the bright light generated by the area according to the original gray data is white light. And if the original gray data obtained by the other areas are smaller than the preset gray threshold, the brightness generated by the other areas is non-white light.
For this frame 60, the area where the sun 601 is located is determined as a white area, and the ratio of the area range occupied by the sun to the area range of the entire frame 60 is calculated.
Several methods of determining the number of white areas are explained below.
In an embodiment, the original gray data only includes original current data, and the control chip counts the number of the original current data greater than the preset current threshold in the original backlight driving data, and determines the number of the white areas in the backlight circuit board.
In another embodiment, the original gray data only includes original PWM data, and the number of original PWM data greater than a preset PWM threshold in the original backlight driving data is counted and determined as the number of white areas in the backlight circuit board.
In another embodiment, the original gray data includes original current data and original PWM data, and the number of original gray data in which the original PWM data is greater than a preset PWM threshold and the original current data is greater than the preset current threshold is counted and determined as the number of white areas in the backlight circuit board.
S202, according to the dimming mapping table, a dimming coefficient corresponding to the ratio is obtained.
The dimming mapping table stores at least one mapping relation between a preset ratio and a corresponding dimming coefficient.
The number of preset ratios and the dimming coefficient corresponding to each preset ratio are set in the dimming mapping table and are determined according to preset parameters of the display equipment, wherein the preset parameters comprise parameters set by a user and parameters correspondingly adjusted by the display equipment according to the current state of the display equipment.
The relationship of the respective dimming coefficients in the dimming map is explained below.
In one case, the dimming coefficients corresponding to the preset ratios in the dimming mapping table are the same, the ratio in the interval formed by the preset ratios is adjusted by adopting the dimming coefficient corresponding to the preset ratio, the ratio outside the interval formed by the preset ratio is not adjusted. For example: when the dimming mapping table comprises a preset ratio, and when the ratio of the white area compared with the whole area is the preset ratio, the original gray data of the white area is adjusted according to the dimming coefficient corresponding to the preset ratio, and when the ratio corresponding to the white area is other ratios, the dimming coefficient is not used for adjustment; the dimming mapping table comprises at least two preset ratios, when dimming coefficients corresponding to the preset ratios are the same, a section from the minimum value to the maximum value in the at least two preset ratios is constructed, when the ratio corresponding to the white area is in the section, the dimming coefficients are used for adjusting the original gray level data of the white area, and when the ratio corresponding to the white area is out of the section, the dimming coefficients are not used for adjusting.
In another case, dimming coefficients corresponding to the preset ratios in the dimming mapping table are not identical, and at least one preset ratio in the dimming mapping table comprises a preset peak value ratio and at least one first preset ratio. The dimming coefficient corresponding to the preset peak value ratio is larger than 1, and the dimming coefficient corresponding to the preset peak value ratio is larger than the dimming coefficient corresponding to each first preset ratio. In the dimming mapping table, the larger the absolute value of the difference between the first preset ratio and the preset peak value ratio is, the larger the difference between the dimming coefficient corresponding to the preset peak value ratio and the dimming coefficient corresponding to the first preset ratio is.
On the basis, if the dimming mapping table can be used for dimming the low gray scale, the at least one first preset ratio comprises a preset low gray scale ratio and at least one second preset ratio, and when the second preset ratio is smaller than the preset low gray scale ratio, the dimming coefficient corresponding to the second preset ratio is smaller than 1; when the second preset ratio is greater than or equal to the preset low gray scale ratio, the dimming coefficient corresponding to the second preset ratio is greater than or equal to 1.
The following table is a dimming mapping table for storing a mapping relationship between a dimming coefficient and a ratio of a white area according to an embodiment.
| Size ratio of white area (%) | Dimming coefficient |
| 0.01 | 0.13 |
| 0.02 | 0.15 |
| 0.05 | 0.45 |
| 0.1 | 0.65 |
| 0.5 | 1.29 |
| 1 | 1.51 |
| 3 | 1.79 |
| 5 | 1.88 |
| 7 | 1.93 |
| 10 | 1.96 |
| 15 | 2.00 |
| 20 | 2.00 |
| 30 | 1.97 |
| 40 | 1.88 |
| 50 | 1.50 |
| 60 | 1.35 |
| 70 | 1.10 |
| 80 | 1.05 |
| 90 | 1.03 |
| 100 | 1.00 |
In the above table, the size ratio of the white area is the preset ratio mentioned in the above embodiment. 15% and 20% are the preset peak ratio, and the corresponding dimming coefficient 2.00 is the maximum value of the dimming coefficients in the dimming mapping table.
The dimming coefficient corresponding to the ratio smaller than 15% and the ratio larger than 20% is smaller than 2.00. In the ratio range of less than 15%, the dimming coefficient increases with an increase in the ratio, and in the ratio range of more than 20%, the dimming coefficient decreases with an increase in the ratio.
And in the ratio range of less than 15%, if 0.1% is the preset low gray scale ratio, the dimming coefficient corresponding to the ratio of less than or equal to 0.1% is less than 1.
When the dimming coefficient is larger than 1, the display screen comprises a more obvious white area, and the display brightness of the white area needs to be increased; when the dimming coefficient is smaller than 1, the display screen is almost a black area, and the brightness of light leakage of the liquid crystal display screen is reduced by reducing the backlight brightness, so that white light in the screen is brighter, the black area is darker, and the contrast of the screen is improved.
The control chip can inquire the ratio in the dimming mapping table to obtain dimming coefficients corresponding to the ratios.
In an embodiment, the dimming mapping table includes dimming coefficients corresponding to all ratios under the preset data precision, and the control chip always obtains the dimming coefficient corresponding to the ratio when inquiring. The corresponding curve of the dimming map is shown in fig. 7.
In another embodiment, the dimming mapping table includes dimming coefficients (as shown in the table above) corresponding to a plurality of preset ratios with preset data precision, and when the control chip queries, if the ratio is the same as the preset ratio, the dimming coefficient corresponding to the preset ratio is determined as the dimming coefficient of the current query; if the ratio is between two preset ratios, interpolation calculation is carried out on the dimming coefficients corresponding to the two preset ratios or an average value of the dimming coefficients corresponding to the two preset ratios is taken, so that the dimming coefficient corresponding to the currently queried ratio is obtained.
Fig. 6 is a flowchart of a method for generating target backlight driving data according to an exemplary embodiment of the present application, as shown in fig. 6, including:
s301, adjusting the original gray scale data of the white area according to the dimming coefficient to generate target gray scale data.
The original backlight driving data comprises original gray data corresponding to the white area and original gray data of other backlight areas.
In this embodiment, only the gradation data corresponding to the white region is adjusted to adjust the brightness of the display thereof.
The raw gray data includes raw current data and/or raw PWM data.
When the original gray-scale data includes only the original current data, a product of the original current data and the dimming coefficient is determined as target current data among the target gray-scale data.
When the original gray-scale data includes only the original PWM data, the product of the original PWM data and the dimming coefficient is determined as target PWM data among the target gray-scale data.
When the original gray-scale data includes current data and PWM data, a product of the original current data, the PWM data, and the dimming coefficient is determined as a product of target current data and target PWM data in the target gray-scale data.
S302, generating target backlight driving data according to the target gray data and the original gray data of other backlight areas.
The target gradation data of each white region, the original gradation data of the other backlight regions in the original backlight driving data, and the address data of each backlight region generated in step S301 are constructed in accordance with the positions of each backlight region.
In one embodiment, the target backlight driving data is as follows:
| Command | Addr1 | Data1 | Addr2 | Data2 | …… | Addn | Datan |
wherein command is an instruction for controlling the backlight light source to emit light, addr represents an address of the backlight area, and Data is gray Data corresponding to the backlight area.
Data includes PWM Data and/or current Data.
The Data change in Data is explained by way of example. For example: when the current value of the white light normally displayed in the original gray data is 16mA and the dimming curve of the current data for adjusting the white area corresponding to the percentage of the white area in the backlight circuit board is as shown in the curve shown in fig. 7, when the duty ratio of the white area is 100%, the dimming coefficient is 1, and the corresponding current value is unchanged and still is 16mA.
Also for example: if the duty ratio of the white area is larger than the preset low gray scale ratio and smaller than a certain preset ratio, such as larger than 0.5% and smaller than 70%, the dimming coefficient is larger than 1 according to the dimming curve so as to improve the current value of the corresponding white area, thereby improving the contrast ratio;
if the duty ratio of the white area is larger than a certain value, such as larger than 70%, the dimming coefficient can be set smaller than 1 because the screen is basically the white area at the moment, and the current value is reduced so as to reduce the power consumption of the power supply.
The control chip transmits target backlight driving data to each backlight area and drives the backlight light sources in each backlight area to emit light.
In an embodiment, the control chip is a dimming controller, and then the control chip transmits the target backlight driving data to a plurality of backlight driving chips 1011 in the backlight display area corresponding to the control chip, and each backlight driving chip 1011 obtains the corresponding address-associated gray scale data from the target backlight driving data according to the position of the corresponding backlight driving chip, and generates a corresponding driving signal according to the gray scale data to drive the backlight light source 1012 to emit light.
The application also provides a display device, a backlight display system, comprising: the control chip and the backlight circuit, the backlight circuit includes a plurality of backlight areas. The control chip is electrically connected to each backlight area, and the data processing process of the control chip is explained in detail in the above embodiments, which is not repeated here.
The present application further provides a display, where the display includes a main controller and the display device provided in the foregoing embodiments, and the main controller is electrically connected to the display device, and the functions of the main controller are explained in the foregoing embodiments, which are not repeated herein.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (9)
1. A data processing method, wherein the method is applied to a control chip, the method comprising:
obtaining original backlight driving data of each frame driving period; the original backlight driving data comprises original gray data of a plurality of backlight areas on a backlight circuit board;
counting the number of white areas in the backlight circuit board according to the original backlight driving data; the white area is a backlight area of which the original gray data is larger than a preset gray threshold value;
determining a dimming coefficient according to the number of the white areas and the number of the backlight areas on the backlight circuit board;
generating target backlight driving data according to the dimming coefficient and the original gray data of the backlight area;
determining a dimming coefficient according to the number of white areas and the number of backlight areas on the backlight circuit board, including:
calculating the ratio of the number of the white areas to the number of the backlight areas on the backlight circuit board;
obtaining a dimming coefficient corresponding to the ratio according to the dimming mapping table;
the dimming mapping table stores at least one mapping relation between a preset ratio and a corresponding dimming coefficient.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the at least one preset ratio comprises a preset peak value ratio and at least one first preset ratio, and a dimming coefficient corresponding to the preset peak value ratio is larger than a dimming coefficient corresponding to the first preset ratio;
and the dimming coefficient corresponding to the preset peak value ratio is larger than 1.
3. The method of claim 2, wherein the step of determining the position of the substrate comprises,
in the dimming mapping table, the larger the absolute value of the difference between the first preset ratio and the preset peak value ratio is, the larger the difference between the dimming coefficient corresponding to the preset peak value ratio and the dimming coefficient corresponding to the first preset ratio is.
4. A method according to claim 2 or 3, characterized in that,
the at least one first preset ratio comprises a preset low gray scale ratio and at least one second preset ratio;
when the second preset ratio is smaller than the preset low gray scale ratio, the dimming coefficient corresponding to the second preset ratio is smaller than 1.
5. The method of claim 1, wherein the raw gray scale data comprises raw current data or raw PWM data, and the preset gray scale threshold comprises a preset current threshold or a preset PWM threshold;
counting the number of white areas in the backlight circuit board according to the original backlight driving data, wherein the counting comprises the following steps:
counting the number of the original current data which is larger than the preset current threshold value in the original backlight driving data, and determining the number as the number of the white areas in the backlight circuit board;
or alternatively
And counting the number of the original PWM data which is larger than the preset PWM threshold value in the original backlight driving data, and determining the number as the number of the white areas in the backlight circuit board.
6. The method of claim 1, wherein the raw gray scale data comprises raw current data and raw PWM data, and the preset gray scale threshold comprises a preset PWM threshold and a preset current threshold;
counting the number of white areas in the backlight circuit board according to the original backlight driving data, wherein the counting comprises the following steps:
and counting the number of the original gray scale data in which the original PWM data is larger than the preset PWM threshold value and the original current data is larger than the preset current threshold value in the original backlight driving data, and determining the number as the number of the white areas in the backlight circuit board.
7. The method of claim 1, wherein the original backlight driving data includes original gray scale data of a white region and original gray scale data of other backlight regions;
generating target backlight driving data according to the dimming coefficient and the original gray data of the backlight area, wherein the target backlight driving data comprises the following steps:
adjusting the original gray data of the white area according to the dimming coefficient to generate target gray data;
and generating the target backlight driving data according to the target gray data and the original gray data of the other backlight areas.
8. The method according to claim 7, wherein the raw gray scale data comprises raw current data and/or raw PWM data;
adjusting the original gray data of the white area according to the dimming coefficient to generate target gray data, wherein the method comprises the following steps:
when the original gray-scale data includes only the original current data, determining a product of the original current data and the dimming coefficient as target current data among the target gray-scale data;
when the original gray-scale data only includes the original PWM data, determining a product of the original PWM data and the dimming coefficient as target PWM data among the target gray-scale data;
when the original gray-scale data includes the current data and the PWM data, a product of the original current data, the PWM data, and the dimming coefficient is determined as a product of target current data and target PWM data in the target gray-scale data.
9. A backlight display system, comprising:
a control chip and a backlight circuit, the backlight circuit comprising a plurality of backlight areas;
the control chip is electrically connected with each backlight area;
the control chip obtains original backlight driving data of each frame driving period; the original backlight driving data comprises original gray data of a plurality of backlight areas on a backlight circuit board;
the control chip counts the number of white areas in the backlight circuit board according to the original backlight driving data; the white area is a backlight area of which the original gray data is larger than a preset gray threshold value;
the control chip determines a dimming coefficient according to the number of the white areas and the number of the backlight areas on the backlight circuit board;
the control chip generates target backlight driving data according to the dimming coefficient and the original gray data of the backlight area;
the control chip determines a dimming coefficient according to the number of the white areas and the number of the backlight areas on the backlight circuit board, and comprises the following steps:
calculating the ratio of the number of the white areas to the number of the backlight areas on the backlight circuit board;
obtaining a dimming coefficient corresponding to the ratio according to the dimming mapping table;
the dimming mapping table stores at least one mapping relation between a preset ratio and a corresponding dimming coefficient.
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