CN100568327C - A kind of method of improving display brightness uniformity of flat-panel display - Google Patents
A kind of method of improving display brightness uniformity of flat-panel display Download PDFInfo
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Abstract
The present invention relates to a kind of method of improving the flat-panel monitor brightness uniformity, its method is: obtain each pixel luminosity of display screen, form luminance matrix; Utilize Image Smoothing Skill that equilibrium treatment is carried out in the brightness of each pixel of display screen, obtain the brightness correction parameter matrix; Utilize the brightness correction parameter matrix, the received image signal of certain pixel is revised, adopt the received image signal after proofreading and correct to drive flat-panel monitor then, the display brightness of each pixel under identical received image signal reached unanimity.Characteristics of the present invention are to utilize human eye responsive and to gradual brightness disproportionation insensitive physiological characteristic that weighs to neighbor brightness disproportionation weighing apparatus, make between the brightness of the brightness of each pixel on the display screen and whole screen and can seamlessly transit, and in level and smooth calculating process, adopt adaptive mode, automatically adjust the size of smooth window according to the unbalance situation of brightness, obtaining to reduce the correction amplitude as far as possible in the homogeneity correction effect preferably, thereby the gradation loss of minimizing pixel, help image and keep clear.
Description
Technical field
The invention belongs to technical field of flat panel display, be specifically related to flat-panel display device display brightness homogeneity and develop skill.
Background technology
It is the important content of infotech that information shows.Flat panel display is becoming the main flow display technique.The flat panel display of industrialization at present has LCD (LCD) and plasma scope (PDP), and the novel flat-plate display technique of researching and developing mainly contains organic light emitting display (OLED), Field Emission Display (FED), electrophoresis showed etc.
No matter be the flat panel display of industrialization, still at the flat panel display that grinds, the display brightness homogeneity is the important performance indexes of display, especially the flat panel display that is grinding, reach application requirements, the homogeneity of brightness of display screen is the right problem of researcher's demand side.For example, in the emission flat panel display on the scene, its displaying principle be utilize electronics that field-causing electron emission phenomenon obtains with high-energy impact fluorescence powder and luminous, its luminescence unit structure is normally combined with video screen fluorescent powder cell array by cold-cathode electron source array and forms the cross matrix pel array.Because machining process exists dispersed, the electron emission characteristic of cold-cathode electron source array there are differences, and will cause the uneven phenomenon of each point emissive source transmitter current size appearance in the pel array, thereby cause each pixel display brightness of display screen inhomogeneous.
Summary of the invention
The invention provides a kind of method of improving display brightness uniformity of flat-panel display, by received image signal is proofreaied and correct, thereby improve the homogeneity of brightness of display screen, improve image displaying quality.
A kind of method of improving display brightness uniformity of flat-panel display of the present invention, content is: at first obtain each pixel luminosity of display screen, form luminance matrix; Utilize Image Smoothing Skill that equilibrium treatment is carried out in the brightness of each pixel of display screen then, obtain the brightness correction parameter matrix; Utilize the brightness correction parameter matrix, received image signal is proofreaied and correct, adopt the received image signal after proofreading and correct to drive flat-panel monitor then.The performing step and the feature of foregoing invention are as follows:
1) for 2
nThe display screen of level gray scale, the input video data that makes each pixel is the gray scale maximal value, promptly 2
n-1, obtain each pixel luminosity of display screen this moment, formation luminance matrix f (i, j), wherein i and j are respectively the positions of pixel place row and column on display screen;
2) utilize smooth template, to luminance matrix f (i j) carries out the neighborhood smoothing processing, obtain a new luminance matrix f ' (i, j);
3) according to step 2) described level and smooth operation result, f ' (i j) compares with former luminance matrix, obtain a brightness excursion matrix Δ f (i, j), wherein Δ f (i, j)=f ' (i, j)-f (i, j);
4) according to the described result of step 3) calculate a correction coefficient alpha (i, j), wherein
And (i is j) as the brightness correction parameter matrix to store α;
5) utilize the brightness correction parameter matrix of step 4) gained, received image signal to certain pixel is proofreaied and correct, adopt the received image signal after proofreading and correct to drive flat-panel monitor then, the display brightness of each pixel under identical received image signal reached unanimity.
Above-mentioned steps 2) described smooth template is Gauss's template, its coefficients by using normalization coefficient.
Above-mentioned steps 2) described smooth template size is according to the unbalance situation adjustment of pixel region brightness.For the less smooth template of the regional preferably preferred dimension of brightness uniformity, to the relatively poor zone of the homogeneity bigger smooth template of preferred dimension then; The method of adjustment of described smooth template size is: get brightness of display screen matrix f (i, mean value j) is f, and a threshold value L is set; Certain pixel carries out in the template computing on to display screen, at first judge the absolute value of the difference of the brightness value f of this pixel and consecutive point thereof and brightness of display screen mean value f | the number that f-f| 〉=L occurs continuously, determine the smooth template size according to number then.
When above-mentioned steps 5) described received image signal to certain pixel carries out treatment for correcting, be the address with the position of this pixel on display screen, the brightness correction parameter α that tables look-up and obtain this pixel calculates and revises off-set value, adds in the received image signal.That is, the gray-scale value of supposing received image signal is G, the received image signal data is added go up offset value delta G, and revised gradation data is G ', then: G '=G+ Δ G=G+G α, and G ' round numbers.
When above-mentioned steps 5) described received image signal to certain pixel carries out treatment for correcting, for the gray-scale value after guaranteeing to proofread and correct does not exceed the display gray scale scope, for realizing 2
nThe gray scale of level shows that revised gray-scale value G ' value is: when the value of G+ Δ G greater than 2
n-1 o'clock, with 2
n-1 received image signal as this pixel; When the value of G+ Δ G is less than or equal to 2
n-1 o'clock, with the received image signal of G '=G+ Δ G=G+G α as this pixel.
The present invention utilizes human eye very sensitive to neighbor brightness disproportionation weighing apparatus, and to gradual brightness disproportionation insensitive physiological characteristic that weighs, and can seamlessly transit between the brightness that makes this pixel and the whole brightness of shielding.The present invention is the dynamic calibration mode, the correction off-set value of each pixel is not fixed, but be directly proportional with the gray-scale value of this pixel received image signal, and in level and smooth calculating process, adopt the size of adjusting smooth window according to the unbalance situation of brightness automatically, obtaining to reduce the correction amplitude as far as possible in the homogeneity correction effect preferably, reduce the gradation loss of pixel, help image and keep clear.
Description of drawings
Fig. 1 is a kind of process flow diagram that improves the method for display brightness uniformity of flat-panel display.
Fig. 2 is the synoptic diagram of the level and smooth computing of neighborhood of 3 * 3 templates.
Fig. 3 is the synoptic diagram that received image signal is carried out treatment for correcting.
Fig. 4 is the process flow diagram that obtains the brightness correction parameter matrix.
Embodiment
Flat-panel monitor with one 256 gray level, 640 * 480 resolution is an example below, further specifies the present invention.
As shown in figures 1 and 3, the received image signal data that each pixel of display screen at first is set are 255, use the auto brightness scanner, obtain the luminosity of each pixel of display screen, measured value deposits the storer of treatment circuit in, (i, j), wherein i and j are respectively the position of pixel place row and column on display screen to form one 480 * 640 luminance matrix f.Use smooth template then, (i j) carries out the neighborhood smoothing processing to luminance matrix f.Template T (x wherein, y) size is m * m (m is an odd number), the T[(m-1 of template center)/2, (m-1)/2] with f (i, j) correspondence, and template used coefficient wants normalization, just, making the element sum of pattern matrix and the multiplication of its front is 1, so the luminance matrix after the smoothing processing is:
In the present embodiment, the smooth template that the luminance matrix smoothing processing is introduced adopts Gauss's template, has so both considered that neighborhood each point and template center can both obtain smooth effect preferably, can reduce gradation loss again, thereby obtains than distinct image.In order to obtain better homogeneity correction effect, can suitably adjust Gauss's template, make the weights of central point pixel identical, and the weights of other pixel is constant with the weights of adjacent 4 pixels.For example, Gauss's template of 3 * 3 is changed into:
As Fig. 2 is the level and smooth computing synoptic diagram of neighborhood of 3 * 3 templates.In the level and smooth computing of template, the pixel of display screen is divided into several zones, according to the unbalance situation of pixel region brightness, adjust the size of smooth window automatically.Method is: set a threshold value L, (i j) obtains brightness of display screen mean value f from luminance matrix f.When certain pixel carries out the template computing on to display screen, at first judge the absolute value of the difference of the brightness value f of this pixel and consecutive point thereof and brightness of display screen mean value f | the number that f-f| 〉=L occurs continuously, determine template size.If the number that occurs is less than at 2 o'clock continuously, then preferred dimension is 3 * 3 template; If equaled 2 o'clock then select 5 * 5 template for use; If the number that occurs illustrates that greater than 2 o'clock the brightness of this pixel region is unbalance very serious continuously, select 7 * 7 template for use.Then level and smooth computing is introduced in the brightness of pixel.As shown in Figure 2, luminance matrix f (i, j) in, suppose pixel P
5The regional luminance homogeneity at (f (5,5)) place is relatively good, i.e. absolute value | and the number that f-f| 〉=L occurs continuously is less than 2, then to pixel P
5When carrying out smoothing processing, select Gauss's template of 3 * 3 for use.It is the discrete convolution computing that institute carries out the level and smooth computing of template, and 3 * 3 convolution kernels are Gauss's templates of 3 * 3 among Fig. 2, therefore to P
5Corrected value P ' after the level and smooth computing
5For:
P’
5＝H
1·P
1+H
2·P
2+H
3·P
3+H
4·P
4+H
5·P
5+H
6·P
6+H
7·P
7+H
8·P
8+H
9·P
9
Wherein 3 * 3 convolution kernels are Gauss's template T of aforementioned 3 * 3
3 * 3, i.e. H
1=1/14, H
2=2/14, in like manner can get H
3～H
9Value.The similar P of smoothing processing to other area pixel point
5Level and smooth operational method identical, no longer exemplify explanation.
Through the luminance matrix f ' after the smoothing processing (i, j) in each pixel brightness value and former luminance matrix f (i, j) brightness data of middle corresponding pixel points subtracts each other, obtain a brightness excursion matrix Δ f (i, j), i.e. Δ f (i, j)=and f ' (i, j)-f (i, j).
(i j) is converted into the gray scale expression formula, to the treatment for correcting of carrying out of input signal Δ f.The gray-scale value of supposing received image signal is G, and the correction offset value delta G that adds gradation data G to is:
Order
(i, j), (i, j) (i, j), the α absolute value is less than 1 less than f owing to Δ f to obtain a brightness correction parameter matrix α.Use nonvolatile memories such as Flash ROM or EPROM, brightness correction parameter is stored in the look-up table.Fig. 4 is the process flow diagram that obtains the brightness correction parameter matrix.
When obtaining brightness correction parameter, relate to a large amount of computational problems, can adopt the C Programming with Pascal Language to realize.Whole calculation procedure is made of following function: 1) main (): be master routine, call subfunction input Luminance Distribution matrix, calculate brightness correction parameter, the output brightness correction parameter; 2) Input_file (): call file, the Luminance Distribution matrix f of input panel (i, j); 3) Tem_operation (): the Luminance Distribution matrix is carried out the template computing, obtain one after level and smooth luminance matrix f (i, j); 4) Para_compute (): calculate brightness correction parameter, obtain a brightness correction parameter matrix α (i, j); 5) Output_file (): the output brightness correction parameter is in file.
Received image signal is being carried out in the step of treatment for correcting, with the position of this pixel on display screen as the address, the brightness correction parameter α that tables look-up and obtain this pixel.The gray-scale value of supposing received image signal is G, received image signal is added go up offset value delta G, and the gradation data after the correction is G ', then: G '=G+ Δ G=G+G α.For guaranteeing that the gray-scale value after the correction does not exceed the display gray scale scope, therefore for realizing 2
nThe gray scale of level shows that revised gray-scale value G ' value is: when the value of G+ Δ G greater than 2
n-1 o'clock, with 2
n-1 received image signal as this pixel; When the value of G+ Δ G is less than or equal to 2
n-1 o'clock, with the received image signal of G '=G+ Δ G=G+G α as this pixel.
At last to G ' round numbers, as proofreading and correct the received image signal that this pixel brightness shows.
Claims (3)
1. method of improving display brightness uniformity of flat-panel display, its content is: at first obtain each pixel luminosity of display screen, form luminance matrix; Utilize Image Smoothing Skill that equilibrium treatment is carried out in the brightness of each pixel of display screen then, obtain the brightness correction parameter matrix; Utilize the brightness correction parameter matrix, proofread and correct showing received image signal voltage; Adopt the received image signal after proofreading and correct to drive flat-panel monitor then, the display brightness of each pixel under identical received image signal reached unanimity, its feature may further comprise the steps:
1) for 2
nThe display screen of level gray scale, the received image signal data that make each pixel are the gray scale maximal value, promptly 2
n-1, obtain each pixel luminosity of display screen this moment, formation luminance matrix f (i, j), wherein i and j are respectively the positions of pixel place row and column on display screen;
2) utilize smooth template, to luminance matrix f (i j) carries out the neighborhood smoothing processing, obtain a new luminance matrix f ' (i, j); This smooth template is Gauss's template, its coefficients by using normalization coefficient, and adjust this Gauss's template, make the weights of central point pixel identical with the weights of adjacent 4 pixels, and the weights of other pixel are constant, in the level and smooth computing of template, display screen matrix is divided into several zones, described smooth template size is according to the unbalance situation adjustment of pixel region brightness; For the less smooth template of the regional preferably preferred dimension of brightness uniformity, to the relatively poor zone of the homogeneity bigger smooth template of preferred dimension then; The method of adjustment of described smooth template size is: get brightness of display screen matrix f (i, mean value j) is f, and a threshold value L is set; When certain pixel carries out the template computing on to display screen, at first judge the absolute value of the difference of the brightness value f of this pixel and consecutive point thereof and brightness of display screen mean value f | the number that f-f| 〉=L occurs continuously, determine the smooth template size according to number then;
3) according to step 2) described level and smooth operation result, f ' (i j) compares with former luminance matrix, obtain a brightness excursion matrix Δ f (i, j), wherein Δ f (i, j)=f ' (i, j)-f (i, j);
4) according to the described result of step 3) calculate a matrix of coefficients α (i, j), wherein
And (i is j) as the brightness correction parameter matrix to store α;
5) utilize the brightness correction parameter matrix of step 4) gained, received image signal to certain pixel is proofreaied and correct, adopt the received image signal after proofreading and correct to drive flat-panel monitor then, the display brightness of each pixel under identical received image signal reached unanimity.
2. a kind of method of improving display brightness uniformity of flat-panel display according to claim 1, it is characterized in that: when the described received image signal to certain pixel of step 5) carries out treatment for correcting, with the position of this pixel on display screen is the address, the brightness correction parameter α that tables look-up and obtain this pixel, calculate and revise off-set value, add in the received image signal, promptly, the gray-scale value of supposing received image signal is G, the received image signal data are added upward offset value delta G, revised gray-scale value is G ', then: G '=G+ Δ G=G+G α, and G ' round numbers.
3. a kind of method of improving display brightness uniformity of flat-panel display according to claim 1, it is characterized in that: when the described received image signal to certain pixel of step 5) carries out treatment for correcting, for guaranteeing that the gray-scale value after the correction does not exceed the display gray scale scope, for realizing 2
nThe gray scale of level shows that revised gray-scale value G ' value is: when the value of G+ Δ G greater than 2
n-1 o'clock, with 2
n-1 received image signal as this pixel; When the value of G+ Δ G is less than or equal to 2
n-1 o'clock, with the received image signal of G '=G+ Δ G=G+G α as this pixel; The symbol definition that relates in the foregoing description is as follows: G represents the gray-scale value of received image signal, and Δ G represents that α represents brightness correction parameter to the off-set value of received image signal data interpolation.
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| CN113241037B (en) * | 2021-05-08 | 2022-07-15 | 湖南国天电子科技有限公司 | LED screen single-point brightness correction method and system |
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