CN106448608B - Screen brightness adjusting method and device aiming at mura problem and television - Google Patents
Screen brightness adjusting method and device aiming at mura problem and television Download PDFInfo
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Abstract
The invention discloses a screen brightness adjusting method, a device and a liquid crystal display device, and the main contents of the method comprise: determining initial brightness data of brightness adjustment areas of reference rows or columns, determining ideal brightness data corresponding to each brightness adjustment area in the reference rows or columns according to a preset fitting function relationship, the initial brightness data of the brightness adjustment areas of the reference rows or columns and the bit sequence of each brightness adjustment area in the reference rows or columns, and subtracting the brightness data of the same brightness adjustment area from the ideal brightness data to obtain compensation brightness data; the compensation brightness data is utilized to determine the brightness adjustment value of each brightness adjustment area in the current reference row or column, and the brightness adjustment is carried out on the brightness adjustment area according to the brightness adjustment value, so that the brightness data of the whole screen is close to ideal brightness data, the display defects caused by backlight reduction and light mixing distance shortening are improved, the whole screen is displayed according to ideal brightness distribution, and the uniform distribution of brightness is realized.
Description
The application is 2015, 3, 11, application number 201510106382.0 and is named as a screen
A screen brightness adjusting method and device and a divisional application of a liquid crystal display device are provided.
Technical Field
The invention relates to the technical field of display, in particular to a screen brightness adjusting method and device aiming at a mura problem and a television.
Background
With the rapid development of the Display technology industry, Liquid Crystal Displays (LCDs) have become mainstream products in recent years. Under the drive of the competitive pressure between the user demand and the industry, the design of the LCD tends to be thinner and lighter, and the power consumption is low.
Since the LCD is not an active light emitting display, it is necessary to rely on a backlight to provide the emergent light to realize the display. As shown in fig. 1, a conventional direct type backlight module mainly includes: a plurality of backlight lamps 101, a diffuser plate 102, a diffusion sheet 103, an optical film 104, and the like. If the design is performed according to the requirements of lightness, thinness, low power consumption and the like, the thinning of the LCD is realized in a mode of shortening the light mixing distance in the backlight module, and in addition, the power consumption of the LCD is reduced in a mode of reducing the number of backlight lamps.
However, the reduction of the number of the backlight lamps makes the distance between the adjacent backlight lamps larger, the brightness at the middle position of the two backlight lamps is obviously darker than the brightness at the position of the two backlight lamps, the light mixing distance is reduced, and the better mixing of the light emitted by the backlight lamps cannot be ensured to obtain uniform backlight, so that the backlight module emits the backlight with uneven brightness, a Mura phenomenon is formed, and the display effect of the LCD is influenced.
Disclosure of Invention
Embodiments of the present invention provide a method and an apparatus for adjusting screen brightness, and a liquid crystal display device, so as to solve the problem in the prior art that the number of backlight lamps is reduced to reduce the light mixing distance in order to achieve the lightness and thinness of the display device, thereby causing display defects such as uneven backlight brightness.
The embodiment of the invention adopts the following technical scheme:
a screen brightness adjusting method is applied to a liquid crystal display device and comprises the following steps:
determining each brightness adjustment area in a reference image displayed on a current screen, wherein the brightness adjustment area is obtained by dividing the reference image according to a preset number of rows and columns, and the reference image is an image with uniform gray scale;
the following operations are respectively performed for each row of brightness adjustment regions or each column of brightness adjustment regions:
acquiring initial brightness data of a brightness adjustment area of a reference row or column;
determining ideal brightness data corresponding to each brightness adjusting area in the reference row or column according to a preset fitting function relationship, the initial brightness data of the brightness adjusting area in the reference row or column and the bit sequence of each brightness adjusting area in the reference row or column;
the initial brightness data and the ideal brightness data in the same brightness adjustment area are subjected to difference to obtain compensation brightness data;
determining brightness adjustment values of all brightness adjustment areas in the current reference row or column according to all the compensation brightness data in the current reference row or column;
and adjusting the brightness of each brightness adjusting area in the current row or column according to the determined brightness adjusting values.
A screen brightness adjusting device is applied to a liquid crystal display device, and comprises:
the first processing unit is used for determining each brightness adjustment area in a reference image displayed on a current screen, wherein the brightness adjustment area is obtained by dividing the reference image according to a preset number of rows and columns, and the reference image is an image with uniform gray scale;
a second processing unit for acquiring initial brightness data of a brightness adjustment region of a reference row or column;
the third processing unit is used for determining ideal brightness data corresponding to each brightness adjusting area in the reference row or column according to a preset fitting function relationship, the initial brightness data of the brightness adjusting area in the reference row or column and the bit sequence of each brightness adjusting area in the reference row or column;
a difference unit, configured to perform a difference between the luminance data of the same luminance adjustment region and the ideal luminance data to obtain compensation luminance data;
the fourth processing unit is used for determining the brightness adjustment value of each brightness adjustment area in the current reference row or column according to each compensation brightness data in the current reference row or column;
and the adjusting unit is used for adjusting the brightness of each brightness adjusting area in the current row or column according to the determined brightness adjusting values.
A liquid crystal display device comprises the screen brightness adjusting device.
According to the adjustment scheme, an ideal brightness data function is obtained by fitting according to a preset fitting function relation and the obtained initial brightness data aiming at each reference row or column, a difference is made between the actual brightness data function and the ideal brightness data function to obtain a compensation brightness data function, and then a brightness adjustment value is determined by utilizing the compensation brightness data function, wherein the brightness adjustment value can be compensation brightness data determined by the compensation brightness data function or corrected compensation brightness data with coarse granularity. Finally, adjusting the brightness of the corresponding brightness adjustment area according to the determined brightness adjustment value, specifically, the brightness adjustment area may be adjusted by the brightness adjustment value determined in the row direction first, and then the brightness adjustment area may be adjusted by the brightness adjustment value determined in the column direction. Actually, the driving voltage is adjusted to change the transmittance of the liquid crystal, thereby adjusting the brightness of the screen. By the adjusting scheme, the brightness data of the whole screen is close to ideal brightness data, the display defect of uneven backlight brightness caused by reduction of backlight and shortening of light mixing distance is overcome, the whole screen is displayed according to ideal brightness distribution, and uniform distribution of brightness is realized. Meanwhile, when the brightness adjustment value is determined, the brightness adjustment value can be determined according to the corrected compensation brightness data, so that the adjustment of overhigh or overlow driving voltage is avoided, the adjustment amplitude of the driving voltage is uniform, and the processing speed and the processing capacity of the adjusting device are improved; moreover, the amplitude is uniform adjustment operation, so that the brightness of the whole screen can be quickly adjusted, and the response time is shortened.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of the method steps in one embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for adjusting screen brightness according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a row and column division according to an embodiment of the present invention;
FIG. 4(a) is a diagram illustrating an ideal effect of a luminance data distribution;
FIG. 4(b) is a diagram illustrating the actual effect of the distribution of the luminance data;
FIG. 5 is a schematic diagram illustrating distribution of an actual luminance data function and an ideal luminance data function in a predetermined coordinate system according to an embodiment of the present invention;
FIG. 6 is a graph illustrating a distribution of compensation luminance data functions;
fig. 7 is a schematic structural diagram of a screen brightness adjusting apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, since the solution is directed to the liquid crystal display device, the luminance of the screen is determined by two aspects, namely, the luminance of the backlight emitted from the backlight module of the display device, and the light transmittance of the liquid crystal. In the invention, because the number of the backlight lamps is fixed and the positions of the backlight lamps are also fixed, the brightness of the screen cannot be adjusted by changing the brightness of the backlight; the light transmittance of the liquid crystal can be changed by adjusting the voltage, so the present invention provides a screen brightness adjustment scheme, which divides the screen of the currently displayed image into a plurality of brightness adjustment regions according to a preset number of rows and columns, and then, according to an iteration principle, performs the following operations for all brightness adjustment regions of each row and all brightness adjustment regions of each column in the current screen respectively: determining initial brightness data of a brightness adjustment area of a reference row or column, determining ideal brightness data corresponding to each brightness adjustment area in the reference row or column according to a preset fitting function relationship, the initial brightness data of each brightness adjustment area and the bit sequence of each brightness adjustment area in the reference row or column, subtracting the brightness data of the same brightness adjustment area from the ideal brightness data to obtain compensation brightness data, determining a brightness adjustment value of each brightness adjustment area in the current reference row or column according to each compensation brightness data in the current reference row or column, and adjusting the brightness of each brightness adjustment area in the current row or column according to each determined brightness adjustment value. Therefore, the brightness data of the whole screen is processed in rows and in columns, so that the brightness data of the whole screen is close to ideal brightness data, the display defects caused by backlight reduction and light mixing distance shortening are overcome, the whole screen is displayed according to ideal brightness distribution, and uniform distribution of brightness is realized. Meanwhile, when the brightness adjustment value is determined, the brightness adjustment value can be determined according to the corrected compensation brightness data, so that the adjustment of overhigh or overlow driving voltage is avoided, the adjustment amplitude of the driving voltage is uniform, and the processing speed and the processing capacity of the adjusting device are improved; moreover, the amplitude is uniform adjustment operation, so that the brightness of the whole screen can be quickly adjusted, and the response time is shortened.
The technical solution of the present invention is described below by specific examples, and the present invention includes, but is not limited to, the following examples.
As shown in fig. 2, a flowchart of the steps of a method for adjusting screen brightness according to an embodiment of the present invention is provided, where the method mainly includes the following steps:
step 101: and determining each brightness adjustment area in the reference image displayed on the current screen.
The brightness adjusting regions are obtained by dividing a reference image according to a preset number of rows and columns, the reference image is an image with uniform gray scale, each brightness adjusting region corresponds to one brightness data, and each brightness adjusting region comprises a plurality of pixel points.
Specifically, if the resolution of the current screen is 640 × 480, the screen may be divided into a preset number of row areas and column areas according to the data processing capability of the current brightness adjustment device, for example: as shown in fig. 3, the screen is divided into 10 rows and 10 columns, and then the screen is divided into 100 brightness adjustment regions, where each brightness adjustment region includes 10 brightness adjustment regions, and each brightness adjustment region includes 64 × 48 pixels. Each row of brightness adjustment regions comprises 10 brightness adjustment regions, and each brightness adjustment region comprises 64 × 48 pixels.
Step 102: initial luminance data of a luminance adjustment region of a reference row or column is determined.
In this step, a Charge-coupled Device (CCD) acquisition tool is used, for example: the CCD camera extracts the brightness data at the corresponding position of each pixel point by shooting a reference line or column mode of an image displayed in the current screen, takes the extracted brightness data as the brightness data of each pixel point in the screen, and then adds the brightness data contained in each brightness adjusting area to average to obtain the initial brightness data of each brightness adjusting area. It should be noted that, in the embodiment of the present invention, the use of the CCD camera is only a preferred scheme, and the luminance data of each pixel point may also be obtained by other existing methods (for example, a two-bit color analyzer). In addition, the initial brightness data of each brightness adjustment region may also be determined by other means, such as: the sum of the luminance data included in each luminance adjustment region is taken as the luminance data of each luminance adjustment region.
It should be noted that, in the embodiment of the present invention, initial luminance data of the entire reference image may also be acquired for the reference image and then stored for later use.
Fig. 4(a) is a schematic diagram showing an ideal effect of the distribution of the luminance data of a reference image, the luminance of the middle area of the screen image is higher, and the luminance of the periphery is gradually reduced, because: considering that users generally pay more attention to the central area of the screen and the brightness of other peripheral areas is not necessarily set too high, in the existing liquid crystal display device, an optical film needs to be arranged to collect most of light to the middle area, so as to form a more ideal screen brightness distribution effect.
In the image obtained by current shooting, the actual brightness distribution is not ideal, and due to the reduction of the backlight and the shortening of the light mixing distance, display defects such as uneven brightness occur in many places, and a brightness distribution which is inconsistent with the ideal screen brightness distribution effect and poor in uniformity is formed, as shown in fig. 4 (b).
Step 103: and determining ideal brightness data corresponding to each brightness adjusting area in the reference row or column according to the preset fitting function relationship and the bit sequence of each brightness adjusting area in the reference row or column.
In the embodiment of the present invention, the luminance data of each luminance adjustment region in the current row or column may be mapped into a preset coordinate system by using a numerical simulation tool, such as MATLAB software, where the preset coordinate system is a coordinate system composed of horizontal coordinates and vertical coordinates, which are the bit sequences of the luminance adjustment regions. Specifically, a preset coordinate system is selected on a simulation interface of MATLAB software and displayed in the simulation interface, a horizontal coordinate axis in the preset coordinate system represents a bit sequence of a brightness adjustment region, and a vertical coordinate axis represents brightness data of the brightness adjustment region, wherein a position value of the brightness adjustment region is based on a sequence of a current row or a current column where the brightness adjustment region is located, for example: for a certain row of brightness adjustment regions, the bit sequence of the 10 th brightness adjustment region in the preset coordinate system is 10. Or, taking the midpoint of the reference row or column as the origin coordinate, if the reference row contains 20 brightness adjustment areas, setting the midpoint position as the origin coordinate, wherein the bit sequence of the brightness adjustment area on the left side of the origin is from-1 to-10, and the bit sequence of the brightness adjustment area on the right side of the origin is from 1 to 10. Then importing the brightness data of each brightness adjusting area in the current row or column through MATLAB software, and drawing an actual brightness data function aiming at the current row or column in a preset coordinate system according to the position coordinate and the brightness data coordinate
. As shown in fig. 5, assume that 400 luminance adjustments are acquired for any of the current rowsThe luminance data of the area is mapped to the coordinate system shown in fig. 5, and an irregular curve R composed of a plurality of points is obtained. Wherein, the horizontal coordinate in the coordinate system is the position of the brightness adjusting area, the brightness data are distributed from 0 to 400, and the value range of the brightness data is [200,320 ]]。
In consideration of the existing display devices, an optical film is provided to condense light to an intermediate area. Therefore, a preset fitting functional relation needs to be determined according to the optical film condensation principle:
using MATLAB software to fit the brightness data of reference row or column to obtain an ideal brightness curve
And
thus, a is determined1、b1、c1Are respectively as
、
、
；a2、b2、c2Are respectively as
、
、
。
It should be noted that, in the embodiment of the present invention, the preset fitting functional relationship is not limited to the fitting functional relationship, and may also be similar to:
fitting functional relationship of (1).
At this time, the fitted ideal luminance data curve S may also be mapped into the coordinate system as shown in fig. 5, so that the difference between the actual luminance data and the ideal luminance data in each luminance adjustment region can be visually seen.
It should be noted that this simulation process can be implemented by other simulation software, and is not limited to MATLAB software according to the present invention.
Step 104: and subtracting the brightness data of the same brightness adjusting area from the ideal brightness data to obtain compensation brightness data.
Using numerical simulation software to make difference between actual brightness data function and ideal brightness data function to obtain compensation brightness data function
And displaying the simulation interface of MATLAB softwareA graph illustrating a distribution of the compensation luminance data function z is shown, as shown in fig. 6, in which a horizontal coordinate represents a position of each luminance adjustment region, and a vertical coordinate represents a difference between luminance data in each luminance adjustment region and ideal luminance data, wherein a positive value represents that luminance data of the luminance adjustment region is greater than the ideal luminance data and the luminance data of the luminance adjustment region needs to be adjusted down; a negative value indicates that the luminance data in the luminance adjustment area is smaller than the ideal luminance data and that the luminance data in the luminance adjustment area needs to be adjusted higher.
Step 105: and determining the brightness adjustment value of each brightness adjustment area in the current reference row or column according to each compensation brightness data in the current reference row or column.
As can be seen from the graph of the distribution of the compensation luminance data function z shown in fig. 6, the compensation luminance data corresponding to each luminance adjustment region can be determined according to the compensation luminance data function z, and the compensation luminance data can be used as the luminance adjustment value of the luminance adjustment region.
Preferably, considering that in the graph of the distribution of the compensation brightness data function z shown in fig. 6, the difference between the compensation brightness data corresponding to the brightness adjustment regions included in each row or column is relatively large, for the current row or column, the brightness adjustment region with the relatively large absolute value of the compensation brightness data must be adjusted by a large margin, for example: the compensation luminance data of a certain luminance adjustment region is-5, the compensation luminance data of the left luminance adjustment region adjacent thereto is +10, and the compensation luminance data of the right luminance adjustment region adjacent thereto is + 8. Since the transmittance of the liquid crystal is changed by adjusting the driving voltage, and the brightness of the screen is adjusted, the large brightness adjustment inevitably increases the load-bearing processing capacity of the driving. Therefore, the compensation brightness value of each brightness adjustment area in the current row or column can be determined according to the compensation brightness data function, and the determined compensation brightness values are averaged to obtain the compensation brightness average value of the current row or column
The compensation brightness data function is subtracted from the obtained compensation brightness average value to obtain a corrected compensation brightness data function
And determining the brightness adjusting value of each brightness adjusting area in the current row or column according to the corrected compensation brightness data function.
Step 106: and adjusting the brightness of each brightness adjusting area in the current row or column according to the determined brightness adjusting values.
Specifically, the determined brightness adjustment value of each brightness adjustment area is converted into a voltage adjustment value of each corresponding brightness adjustment area, and the voltage of the pixel point corresponding to each brightness adjustment area is adjusted according to the voltage adjustment value, so that the brightness of each brightness adjustment area in the current reference row or column is adjusted.
Preferably, the supply of the voltage signal can be realized by a tcon board.
In the embodiment of the present invention, each brightness adjustment region has its own brightness adjustment value, so that the brightness adjustment values of the pixels included in any brightness adjustment region are the same as long as they belong to the same brightness adjustment region.
The above-described aspect of the present invention is briefly described below by way of a specific example.
It is assumed that the luminance data of the determined 9 luminance adjustment regions of the reference line are 80, 20, 30, 40, 60, 40, 30, 20, 10, respectively. The brightness data of the reference line is substituted into numerical simulation software to simulate an actual brightness data function
Then according to a preset fitting functional relation
Determining an ideal luminance data function
And further determining ideal brightness data for each brightness adjustment region: 18. 20, 35, 46, 80, 46, 35, 20, 18. And (3) making difference between the ideal brightness data and the actual brightness data to respectively obtain the compensation brightness data of each brightness adjustment area: -62, 0, 5, 6, 20, 6, 5, 0, 8. And if the calculated compensation brightness data are used as brightness adjustment values, respectively determining a voltage adjustment value corresponding to each compensation brightness data, and then sequentially and respectively adjusting the brightness of the 9 brightness adjustment areas of the reference line. If the driving overload caused by the adjustment voltage is reduced, the average value of the compensation brightness can be obtained according to each compensation brightness data: -1.3, then subtracting the compensated luminance data from the compensated luminance average to obtain a luminance adjustment value: 60.7, 1.3, 6.3, 7.3, 21.3, 7.3, 6.3, 1.3, 9.3, and then brightness adjustment is performed on the 9 brightness adjustment regions obtained by the reference line in sequence.
According to the above adjustment scheme, the adjustment scheme may be performed on each row in the screen of the display device, and then the adjustment scheme may be performed on each column, specifically, by the above scheme, a brightness adjustment value of a brightness adjustment region included in each row is determined, and a brightness adjustment value of a brightness adjustment region included in each column is determined, so that the same brightness adjustment region corresponds to two brightness adjustment values (a brightness adjustment value in the row direction and a brightness adjustment value in the column direction), and thus, the brightness adjustment may be performed on the brightness adjustment region by using the brightness adjustment value in the row direction first, and then, the brightness adjustment may be performed on the brightness adjustment region by using the brightness adjustment value in the column direction. Or the brightness adjustment area can be adjusted by the brightness adjustment value in the column direction, and then adjusted by the brightness adjustment value in the row direction. The present invention is not limited to this, and the luminance adjustment region may be adjusted after the luminance adjustment value in the row direction is determined, and then the luminance adjustment value in the column direction may be determined from the luminance data of each luminance adjustment region determined before, and the second adjustment may be performed using the luminance adjustment value. Thus, not only each row but also each column is made to conform to the ideal luminance data distribution.
According to the adjusting scheme, aiming at each row or column, an actual brightness data function is obtained by using the obtained brightness data of the current screen, an ideal brightness data function is obtained by fitting according to the optical diaphragm light gathering principle and the obtained brightness data, a compensation brightness data function is obtained by comparing the actual brightness data function with the ideal brightness data function, and a brightness adjusting value is determined by using the compensation brightness data function, wherein the brightness adjusting value can be compensation brightness data determined by the compensation brightness data function, and can also be corrected compensation brightness data with coarse granularity. And finally, adjusting the brightness of the corresponding brightness adjustment area according to the determined brightness adjustment value, wherein the liquid crystal transmittance is changed by actually adjusting the driving voltage, so that the adjustment of the screen brightness is realized. Through the adjusting scheme, the brightness data of the whole screen is close to ideal brightness data, the display defects caused by reduction of backlight lamps and shortening of light mixing distance are overcome, the whole screen is displayed according to ideal brightness distribution, and uniform distribution of brightness is achieved. Meanwhile, when the brightness adjustment value is determined, the brightness adjustment value can be determined according to the corrected compensation brightness data, so that the adjustment of overhigh or overlow driving voltage is avoided, the adjustment amplitude of the driving voltage is uniform, and the processing speed and the processing capacity of the adjusting device are improved; moreover, the amplitude is uniform adjustment operation, so that the brightness of the whole screen can be quickly adjusted, and the response time is shortened.
Based on the same inventive concept as the screen brightness adjusting method, the embodiment of the present invention further provides a screen brightness adjusting apparatus, which is described below by specific embodiments.
As shown in fig. 7, the screen brightness adjusting device provided in the embodiment of the present invention may be integrated inside the display device, or hung outside the display device, and the structure position of the device is not limited. Wherein, the device mainly includes:
a first processing unit 201, configured to determine each brightness adjustment area in the reference image displayed on the current screen. The brightness adjustment area is obtained by dividing a reference image according to a preset number of rows and columns, and the reference image is an image with uniform gray scale.
A second processing unit 202, configured to determine initial luminance data of a luminance adjustment area of a reference row or column. The second processing unit 202 is specifically configured to capture a reference row or column of a reference image displayed in a current screen by using an industrial camera, and extract luminance data at a position corresponding to each pixel point in the reference row or column of the reference image; and averaging the brightness data contained in each brightness adjustment area to obtain initial brightness data of each brightness adjustment area.
The third processing unit 203 is configured to determine ideal luminance data corresponding to each luminance adjustment region in the reference row or column according to a preset fitting function relationship, the initial luminance data of the luminance adjustment region in the reference row or column, and a bit sequence of each luminance adjustment region in the reference row or column. The third processing unit 203 is specifically configured to determine a preset fitting function relationship according to the optical film light-gathering principle:
wherein x is1Indicating the bit sequence of the brightness adjustment region from the start position to the midpoint position of the reference row or column in the reference row or column, Y1Brightness data representing the correspondence of each brightness adjustment area, a1、b1、c1The coefficients that determine the ideal luminance data function, and,
fitting the brightness data of the reference row or column according to the fitting function relationship to obtain an ideal brightness curve; ideal luminance data of all luminance adjustment regions of the reference row or column is determined from the ideal luminance profile.
A difference unit 204, configured to perform a difference between the luminance data of the same luminance adjustment area and the ideal luminance data to obtain compensated luminance data.
A fourth processing unit 205, configured to determine, according to each compensated luminance data in the current reference row or column, a luminance adjustment value of each luminance adjustment area in the current reference row or column. A fourth processing unit 205, specifically configured to determine the compensated luminance data as compensated luminance values of each luminance adjustment area in the current row or column; averaging all the determined compensation brightness values to obtain the compensation brightness average value of the current row or column; and subtracting the compensation brightness value from the compensation brightness average value to obtain the brightness adjustment value of each brightness adjustment area in the reference row or column.
An adjusting unit 206, configured to perform brightness adjustment on each brightness adjustment area in the current row or column according to the determined brightness adjustment values. The adjusting unit 206 is specifically configured to: and converting the determined brightness adjustment value of each brightness adjustment area into a voltage adjustment value of each corresponding brightness adjustment area, and adjusting the voltage of the pixel point corresponding to each brightness adjustment area according to the voltage adjustment value, so that the brightness of each brightness adjustment area in the current reference row or column is adjusted.
In addition, the embodiment of the invention also provides a liquid crystal display device which comprises the screen brightness adjusting device in the embodiment.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A screen brightness adjusting method aiming at mura problem is applied to a direct type liquid crystal display device and is characterized by comprising the following steps:
acquiring brightness data of a plurality of brightness adjustment areas which are formed by dividing a screen currently displaying a preset gray-scale image according to a preset number of rows and columns;
mapping the coordinate system of the brightness data of all brightness adjusting areas in the current row or the current column to obtain an actual brightness data curve;
fitting the brightness data in the coordinate system according to a preset fitting function to obtain an ideal brightness data curve;
the brightness data corresponding to the actual brightness data curve at the position of the same brightness adjustment area is subtracted from the brightness data corresponding to the ideal brightness data curve to obtain a compensation brightness data curve;
calculating the brightness adjustment value of each brightness adjustment area in the current row or column according to the compensation brightness data curve;
and adjusting the brightness of each brightness adjusting area in the current row or column according to the brightness adjusting value of each brightness adjusting area.
2. The method according to claim 1, wherein fitting the luminance data in the coordinate system according to a preset fitting function to obtain an ideal luminance data curve specifically comprises:
determining a fitting function according to the optical diaphragm light-gathering principle
Wherein x is1Indicating the bit sequence of the brightness adjustment region in a row or column from the start position to the midpoint position of said row or column, Y1Brightness data representing the brightness of each brightness adjustment region from the start position to the midpoint position of the row or column, a1、b1、c1The coefficients that determine the ideal luminance data function, and,
and substituting the brightness data in the coordinate system into a fitting function, and fitting to obtain an ideal brightness data curve.
3. The method of claim 1, wherein determining the brightness adjustment value of each brightness adjustment area in the current row or column according to the compensated brightness data curve comprises:
determining the compensation brightness value of each brightness adjustment area in the current row or column according to the compensation brightness data curve;
averaging all the compensation brightness values to obtain the compensation brightness average value of the current row or column;
subtracting the compensation brightness data function from the compensation brightness average value to obtain a corrected compensation brightness data function;
and determining the brightness adjustment value of each brightness adjustment area in the current row or column according to the corrected compensation brightness data function.
4. A screen brightness adjusting device aiming at mura problem is applied to a direct type liquid crystal display device, and is characterized by comprising:
the first processing unit is used for acquiring brightness data of a plurality of brightness adjusting areas which are formed by dividing a screen currently displaying a preset gray-scale image according to a preset number of rows and columns;
the second processing unit is used for mapping the coordinate system of the brightness data of all the brightness adjusting areas in the current row or the current column to obtain an actual brightness data curve;
the third processing unit is used for fitting the brightness data in the coordinate system according to a preset fitting function to obtain an ideal brightness data curve;
a difference unit, configured to perform a difference between luminance data corresponding to the actual luminance data curve and luminance data corresponding to the ideal luminance data curve at the same luminance adjustment region, to obtain a compensated luminance data curve;
the fourth processing unit is used for calculating the brightness adjustment value of each brightness adjustment area in the current row or column according to the compensation brightness data curve;
and the adjusting unit is used for adjusting the brightness of each brightness adjusting area in the current row or column according to the brightness adjusting value of each brightness adjusting area.
5. The screen brightness adjusting apparatus according to claim 4, wherein the third processing unit is specifically configured to:
determining a fitting function according to the optical diaphragm light-gathering principle
Wherein x is1Indicating the bit sequence of the brightness adjustment region in a row or column from the start position to the midpoint position of said row or column, Y1Brightness data representing the brightness of each brightness adjustment region from the start position to the midpoint position of the row or column, a1、b1、c1The coefficients that determine the ideal luminance data function, and,
and substituting the brightness data in the coordinate system into a fitting function, and fitting to obtain an ideal brightness data curve.
6. The screen brightness adjusting apparatus according to claim 5, wherein the fourth processing unit is specifically configured to:
determining the compensation brightness value of each brightness adjustment area in the current row or column according to the compensation brightness data curve;
averaging all the compensation brightness values to obtain the compensation brightness average value of the current row or column;
subtracting the compensation brightness data function from the compensation brightness average value to obtain a corrected compensation brightness data function;
and determining the brightness adjustment value of each brightness adjustment area in the current row or column according to the corrected compensation brightness data function.
7. A television set comprising the screen brightness adjusting apparatus according to any one of claims 4 to 6.
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