CN103021345B - Method for eliminating light leak of liquid crystal display - Google Patents
Method for eliminating light leak of liquid crystal display Download PDFInfo
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- CN103021345B CN103021345B CN201210550735.2A CN201210550735A CN103021345B CN 103021345 B CN103021345 B CN 103021345B CN 201210550735 A CN201210550735 A CN 201210550735A CN 103021345 B CN103021345 B CN 103021345B
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Abstract
The invention relates to the technical field of liquid crystal display devices and discloses a method for eliminating light leak of a liquid crystal display. The method specifically includes the following steps that image average brightness Lmin is obtained through detection and saved when dark field details of the liquid crystal display are just difficult to distinguish, a liquid crystal display chip reads an average brightness value APL of each frame of input images signals, and the liquid crystal display chip turns down electrical levels of voltage control pins of a backlight when the average brightness value APL of the input image signals is smaller than the image average brightness Lmin obtained when details are just difficult to distinguish. According to the average brightness and brightness column diagram of a current image, the dark field image regulates regulating voltage of the backlight so as to change brightness of the image according to the input signals. When the brightness of the input image is reduced to a certain extent and the light leak phenomenon of the liquid crystal display is obvious, the voltage of the backlight of the whole machine is regulated into zero, so that the crystal liquid display is darkened to possibly eliminate the light leak phenomenon.
Description
Technical field
The present invention relates to liquid crystal display device technical field, particularly relate to a kind of method eliminating light leak of liquid crystal display.
Background technology
Lyo-luminescence relies on passive light source, can not turn off the power supply of lamp completely, so liquid crystal display details in a play not acted out on stage, but told through dialogues is generally brighter.The darkest GTG of LCD screen is usually between 0.10-1.5nit; How much there is light leakage phenomena in each liquid crystal display, particularly 4 angles of liquid crystal display, and under dark field signal, performance obviously, causes the details in a play not acted out on stage, but told through dialogues brightness of LCD TV extremely uneven.
Solve light leak of liquid crystal display in prior art and usually adopt following two kinds of modes: 1. improve from structure in process of production, all stick shading rubber belt in the junction of the glue frame of liquid crystal display edge and backlight module, form the shading glue band closed.Adopt aforesaid way that the gap between liquid crystal display and backlight glue frame can be made completely closed, effectively stop light leak.But aforesaid way obviously can increase production cost on the one hand, meanwhile, once the bad meeting of PROCESS FOR TREATMENT causes light leak greatly.2. user is under details in a play not acted out on stage, but told through dialogues picture, the analog quantity such as brightness, contrast of debugging complete machine, all GTGs are dimmed together, this method can have certain effect for certain scene, but after handoff scenario, image can be obviously partially dark, finally can not eliminate the leakage problem of liquid crystal display, and needing user from Row sum-equal matrix, also will switch according to the change of brightness of image after adjustment, operability is strong and reduce Consumer's Experience.
Summary of the invention
The method cost that the object of the invention is for eliminating light leak of liquid crystal display in prior art is high, realizes the technical matters of difficulty, provides a kind of method eliminating light leak of liquid crystal display.
Object of the present invention is realized by following technical proposals: a kind of method eliminating light leak of liquid crystal display, it specifically comprises following steps: detection obtains liquid crystal display details in a play not acted out on stage, but told through dialogues details and is just difficult to mean picture brightness Lmin when differentiating and preserves, liquid crystal display chip reads the average brightness value APL of each frame input image signal, when the average brightness value APL of input image signal be less than details be just difficult to differentiate time mean picture brightness Lmin time, the level of backlight Control of Voltage pin is turned down by liquid crystal display chip.Brightness according to received image signal regulates backlight voltage in real time, when input image lightness is darker, dims backlight by correspondence, reaches the technique effect eliminating light leak of liquid crystal display.The present invention's employing automatically adjusts backlight voltage according to input image lightness and eliminates light leak of liquid crystal display, does not increase any hardware device, reduces production cost, have the effect of extraordinary elimination light leak simultaneously.
Further, above-mentioned liquid crystal display chip is turned down by the level of Pulse Width Control by backlight Control of Voltage pin.Adopt Pulse Width Control, realize easily, cost is low.
Further, said method specifically comprises the following steps: step 1. detection obtains liquid crystal display details in a play not acted out on stage, but told through dialogues details and is just difficult to mean picture brightness Lmin when differentiating and preserves; Step 2. liquid crystal display chip reads the average brightness value APL of each frame input image signal, and obtains according to statistics of histogram the intensity gray scale whether this frame input picture exceed half pixel and be less than setting threshold value GTG; Step 3. when the average brightness value APL of input image signal be less than details in a play not acted out on stage, but told through dialogues details be just difficult to differentiate time mean picture brightness Lmin, and the intensity gray scale exceeding half pixel be less than setting threshold value GTG time, liquid crystal display chip by the level adjustment of backlight Control of Voltage pin to minimum; When the average brightness value APL of input image signal be less than details in a play not acted out on stage, but told through dialogues details be just difficult to differentiate time mean picture brightness Lmin, and the intensity gray scale exceeding half pixel be more than or equal to setting threshold value GTG time, liquid crystal display chip by the level adjustment of backlight Control of Voltage pin to 1/2 of maximal value.Above by threshold value setting and exceed half pixel intensity gray scale statistics, reach the object of quick adjustment voltage.
Further, detect the mean picture brightness Lmin that liquid crystal display details in a play not acted out on stage, but told through dialogues details is just difficult to when differentiating in above-mentioned steps 1 to be specially and to comprise: access details in a play not acted out on stage, but told through dialogues grayscale signal, the brightness and contrast of adjustment image, when making the 4th rank and the 5th rank signal be difficult to differentiate, again under current brightness and contrast value, the pure white field signal of access 100%, it is just be difficult to mean picture brightness Lmin when differentiating that the brightness that test obtains is details in a play not acted out on stage, but told through dialogues details.Optical instrument identification is adopted to have better precision compared to eyes.
Further, the average brightness value APL reading each frame input image signal in above-mentioned steps 2 specifically comprises: input picture carries out AD conversion, simulating signal is converted to digital signal, then the intensity gray scale value of each pixel is gathered, the summation of the intensity gray scale value of these points is counted divided by total, obtains the average brightness value APL of every frame input picture.Said method can obtain the average brightness value APL of every frame input picture more quickly.
Further, above-mentioned setting threshold value GTG is 5.Above-mentioned threshold value is the experience preference data of test of long duration.
Further, the level adjustment of above-mentioned backlight Control of Voltage pin is to being 0 time minimum.When the performance of light leak of liquid crystal display phenomenon is obvious, the back of the body modulating voltage of complete machine is adjusted to 0, make liquid crystal display the darkest, to eliminate light leakage phenomena as much as possible.
By adopting above technical scheme, the invention has the beneficial effects as follows: according to mean flow rate and the brightness histogram of present image, regulating the regulation voltage of back of the body lamp for darkfield image, the corresponding input signal of the brightness of image is changed.When the brightness of input picture is to a certain extent low, when the performance of light leak of liquid crystal display phenomenon is obvious, the back of the body modulating voltage of complete machine is adjusted to 0, make liquid crystal display the darkest, to eliminate light leakage phenomena as much as possible.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with saying specific embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Backlight is positioned at liquid crystal display a kind of light source behind, and its illumination effect will directly have influence on the visual effect of liquid crystal display.Liquid crystal display has usually back of the body modulating voltage control pin, can control the brightness of liquid crystal display according to the level of this pin, such as, 0V, lamp is the darkest, and 3.3V lamp is the brightest.The pin of increase when this voltage is to carry out efficiency test the earliest, generally seldom regulates.Method of the present invention utilizes back of the body modulating voltage to control to solve the details in a play not acted out on stage, but told through dialogues leakage problem of LCD TV at this.
The invention discloses a kind of method eliminating light leak of liquid crystal display, it specifically comprises following steps: step 1. adopts optical tester to detect and obtains the high-high brightness Lmax of liquid crystal display, details in a play not acted out on stage, but told through dialogues details is just difficult to mean picture brightness Lmin when differentiating, visual mean picture brightness Lmid when watching that brightness of image is moderate; Wherein the detection method of above-mentioned three brightness can be:
Use optic test instrument Chroma7123, overall GTG is 0-255.
(1) test the pure white field signal of 100%, debugged by backlight illumination maximum, the brightness of test is the high-high brightness Lmax of liquid crystal display.
(2) below usual 64 GTGs be details in a play not acted out on stage, but told through dialogues, such as access 64 grayscale signal, the brightness and contrast of adjustment image, when making the 4th rank and the 5th rank signal be difficult to differentiate, again under current brightness and contrast value, the pure white field signal of access 100%, the brightness of test and details in a play not acted out on stage, but told through dialogues details are just be difficult to mean picture brightness Lmin when differentiating.Adopt instrument to detect, compared to eye recognition, there is higher reliability.
(3) below usual 64 GTGs be details in a play not acted out on stage, but told through dialogues, access 64 grayscale signal, the brightness and contrast of adjustment image, when making the 32nd rank and the 31st rank signal be difficult to differentiate, again under current brightness and contrast value, the pure white field signal of access 100%, the brightness of test is the visual mean picture brightness Lmid that brightness of image is moderate that watches;
Wherein be difficult to differentiate and refer to that optical testing instrument can not know the difference, also have the He Saier containing value of eyes in addition in the world, He Saier containing value: just refer to variant, but eyes can not differentiated, those skilled in the art just think it is consistent.The content that above step 1 relates to is those skilled in the art, and normally used detection high-high brightness Lmax, details in a play not acted out on stage, but told through dialogues details are just difficult to mean picture brightness Lmin when differentiating and visual conventional method of watching the mean picture brightness Lmid that brightness of image is moderate at the scene, do not belong to emphasis of the present invention, those skilled in the art should understand, and does not repeat them here.
Step 2. liquid crystal display chip reads the average brightness value APL of each frame input image signal, and obtains according to statistics of histogram the intensity gray scale whether this frame input picture exceed half pixel and be less than 5.Wherein, step 2 is specially a two field picture and at least reads 4-5 time, then obtains the average brightness value APL of each frame input image signal, and circulation is read 4-5 time, just assert that data are effective, it is set to the average brightness value APL of corresponding frame.Make the result of reading more accurate.
Step 3. is less than the mean picture brightness Lmin that details in a play not acted out on stage, but told through dialogues details is just difficult to when differentiating as average brightness value APL, and the intensity gray scale exceeding half pixel is less than setting threshold value, such as 5 time, by the level adjustment of back of the body modulating voltage control pin to minimum, such as, be set to 0; When average brightness value APL is less than the mean picture brightness Lmin that details in a play not acted out on stage, but told through dialogues details is just difficult to when differentiating, and the intensity gray scale exceeding half pixel is more than or equal to setting threshold value, such as 5 time, will the level adjustment of back of the body modulating voltage control pin to 1/2 of currency.In other cases, such as, when average brightness value APL is more than or equal to the mean picture brightness Lmin that details is just difficult to when differentiating, the level of back of the body modulating voltage control pin is not changed.
For image display, image display is darker, and the mean flow rate of image is lower; Image display is brighter, and mean flow rate is higher.The present invention, according to the mean flow rate of present image and brightness histogram, regulates the regulation voltage of back of the body lamp for darkfield image, the corresponding input signal of the brightness of image is changed.When the brightness of input picture is to a certain extent low, when the performance of light leak of liquid crystal display phenomenon is obvious, the back of the body modulating voltage of complete machine is adjusted to 0, make liquid crystal display the darkest, to eliminate light leakage phenomena as much as possible.Adopt the method for this brightness self-adaptative adjustment, not only for the TV watching state of LCD TV, under video state, watch that the effect of Set Top Box also has change very much.Make the design hommization more of complete machine, and do not increase extra device, method is simple, effectively can promote the effect of watching of user.
Method of the present invention is verified on 3D32A7000i complete machine, and for dark scene signal, the level of the back of the body modulating voltage control pin shielded by adjustable liquid crystal display, eliminates light leak of liquid crystal display phenomenon well.
Televisor watches TV, and demodulates vision signal, and master chip reads the average brightness value (being called for short APL) of each input image signal in real time, and value is between 0 ~ 100.If actual test brightness embodies with the form of 0 ~ MAX, then the corresponding average brightness value of MAX 100;
After televisor enters course of normal operation, software reads the APL value of a present image within each major cycle cycle (this cycle period is defined as T), general T<20ms.
After testing for multiple picture collection, test obtains APL thresholding, is handled as follows image according to thresholding:
When APL<Lmin & Most current intensity gray scale is all less than 5, back of the body lamp regulation voltage is adjusted to minimum, makes darkfield image brightness more black, eliminate light leakage phenomena; When APL<Lmin & Most current intensity gray scale is greater than 5, back of the body lamp regulation voltage is regulated to be adjusted to 1/2 of normal value; Lmid>APL >=Lmin, is adjusted to normal value by back of the body lamp regulation voltage.
By the present invention, eliminate liquid crystal display details in a play not acted out on stage, but told through dialogues brightness irregularities problem, improve the image quality effect of LCD TV; Under the condition not rectifying and improving liquid crystal display, the method that outside movement control panel carries out is improved.The present invention is by the mean flow rate of real-time determination and analysis picture signal and current picture material, and for dark scene signal, the back of the body modulating voltage of optimization adjustable liquid crystal display screen, to eliminate light leak of liquid crystal display phenomenon.Achieve according to different picture materials, signal input brightness is detected automatically; Under the obvious darkfield image of light leak, the back of the body modulating voltage of optimization adjustable liquid crystal display screen.
Above-mentioned explanation illustrate and describes a preferred embodiment of the present invention, but as previously mentioned, be to be understood that the present invention is not limited to the form disclosed by this paper, should not regard the eliminating to other embodiments as, and can be used for other combinations various, amendment and environment, and can in invention contemplated scope described herein, changed by the technology of above-mentioned instruction or association area or knowledge.And the change that those skilled in the art carry out and change do not depart from the spirit and scope of the present invention, then all should in the protection domain of claims of the present invention.
Claims (6)
1. eliminate the method for light leak of liquid crystal display for one kind, it specifically comprises following steps: detection obtains liquid crystal display details in a play not acted out on stage, but told through dialogues details and is just difficult to mean picture brightness Lmin when differentiating and preserves, liquid crystal display chip reads the average brightness value APL of each frame input image signal, when the average brightness value APL of input image signal be less than details be just difficult to differentiate time mean picture brightness Lmin time, the level of backlight Control of Voltage pin is turned down by liquid crystal display chip; Described method specifically comprises the following steps: step 1. detection obtains liquid crystal display details in a play not acted out on stage, but told through dialogues details and is just difficult to mean picture brightness Lmin when differentiating and preserves; Step 2. liquid crystal display chip reads the average brightness value APL of each frame input image signal, and obtains according to statistics of histogram the intensity gray scale whether this frame input picture exceed half pixel and be less than setting threshold value GTG; Step 3. when the average brightness value APL of input image signal be less than details in a play not acted out on stage, but told through dialogues details be just difficult to differentiate time mean picture brightness Lmin, and the intensity gray scale exceeding half pixel be less than setting threshold value GTG time, liquid crystal display chip by the level adjustment of backlight Control of Voltage pin to minimum; When the average brightness value APL of input image signal be less than details in a play not acted out on stage, but told through dialogues details be just difficult to differentiate time mean picture brightness Lmin, and the intensity gray scale exceeding half pixel be more than or equal to setting threshold value GTG time, liquid crystal display chip by the level adjustment of backlight Control of Voltage pin to 1/2 of maximal value.
2. the method eliminating light leak of liquid crystal display as claimed in claim 1, is characterized in that described liquid crystal display chip is turned down by the level of Pulse Width Control by backlight Control of Voltage pin.
3. the method eliminating light leak of liquid crystal display as claimed in claim 2, it is characterized in that detecting in described step 1 the liquid crystal display details in a play not acted out on stage, but told through dialogues details mean picture brightness Lmin be just difficult to when differentiating to be specially and to comprise: access details in a play not acted out on stage, but told through dialogues grayscale signal, the brightness and contrast of adjustment image, when making the 4th rank and the 5th rank signal be difficult to differentiate, again under current brightness and contrast value, the pure white field signal of access 100%, it is just be difficult to mean picture brightness Lmin when differentiating that the brightness that test obtains is details in a play not acted out on stage, but told through dialogues details.
4. the method eliminating light leak of liquid crystal display as claimed in claim 3, it is characterized in that the average brightness value APL reading each frame input image signal in described step 2 specifically comprises: input picture carries out AD conversion, simulating signal is converted to digital signal, then the intensity gray scale value of each pixel is gathered, the summation of the intensity gray scale value of these points is counted divided by total, obtains the average brightness value APL of every frame input picture.
5. the method eliminating light leak of liquid crystal display as claimed in claim 4, is characterized in that described setting threshold value GTG is 5.
6. the as claimed in claim 5 method eliminating light leak of liquid crystal display, is characterized in that the level adjustment of described backlight Control of Voltage pin is to being 0 time minimum.
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| CN108682368B (en) * | 2018-05-18 | 2021-06-25 | 青岛海信医疗设备股份有限公司 | Display screen light leakage detection method and system and display |
| CN112750405A (en) * | 2019-10-31 | 2021-05-04 | 合肥京东方显示技术有限公司 | Display device, driving method and device thereof, and computer-readable storage medium |
| CN112599088B (en) * | 2020-12-02 | 2022-04-12 | 深圳市汇顶科技股份有限公司 | Screen light leakage and ambient light detection method, chip, terminal and storage medium |
| CN114023274B (en) * | 2021-11-26 | 2023-07-25 | 惠州视维新技术有限公司 | Backlight adjustment method, device, display equipment and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008020887A (en) * | 2006-06-15 | 2008-01-31 | Victor Co Of Japan Ltd | Apparatus and method for displaying video |
| CN101777310A (en) * | 2010-03-05 | 2010-07-14 | 青岛海信电器股份有限公司 | Dynamic backlight control method |
| CN101794542A (en) * | 2009-01-30 | 2010-08-04 | 日立民用电子株式会社 | Video display apparatus |
| CN102262866A (en) * | 2010-05-28 | 2011-11-30 | 日立民用电子株式会社 | Liquid crystal display device |
| CN102365674A (en) * | 2009-03-27 | 2012-02-29 | Nec显示器解决方案株式会社 | Image display and image correction method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3975357B2 (en) * | 2003-06-12 | 2007-09-12 | 船井電機株式会社 | LCD television equipment |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008020887A (en) * | 2006-06-15 | 2008-01-31 | Victor Co Of Japan Ltd | Apparatus and method for displaying video |
| CN101794542A (en) * | 2009-01-30 | 2010-08-04 | 日立民用电子株式会社 | Video display apparatus |
| CN102365674A (en) * | 2009-03-27 | 2012-02-29 | Nec显示器解决方案株式会社 | Image display and image correction method |
| CN101777310A (en) * | 2010-03-05 | 2010-07-14 | 青岛海信电器股份有限公司 | Dynamic backlight control method |
| CN102262866A (en) * | 2010-05-28 | 2011-11-30 | 日立民用电子株式会社 | Liquid crystal display device |
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