CN100460967C - Method for inspecting and eliminating liquid-crystal display device ghost image - Google Patents
Method for inspecting and eliminating liquid-crystal display device ghost image Download PDFInfo
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- CN100460967C CN100460967C CNB2005101295947A CN200510129594A CN100460967C CN 100460967 C CN100460967 C CN 100460967C CN B2005101295947 A CNB2005101295947 A CN B2005101295947A CN 200510129594 A CN200510129594 A CN 200510129594A CN 100460967 C CN100460967 C CN 100460967C
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Abstract
A method for detecting and eliminating ghost effect of liquid crystal display includes calculating out product of human visual sense holding time and maximum color variation speed to obtain threshold, calculating out density grade change-amount of pixel key element on liquid crystal display, comparing said threshold with said density grade change-amount, detecting and eliminating ghost effect by making said threshold be greater than density grade change-amount.
Description
Technical field
The present invention relates to a kind ofly, particularly relate to Thin Film Transistor-LCD in order to detect and to eliminate the method for the ghost image (ghosting effect) of LCD.
Background technology
LCD (LCD) has been widely used in the display device of desktop computer computer screen, notebook computer screen, TV and other kinds, along with the development of its manufacturing technology, the quality of the range of application of LCD and made product also will continue to grow up and development in future.
Yet, with traditional cathode ray tube (CRT) display or nearest plasma (Plasma) display by comparison, the maximum in the use shortcoming of LCD is to have the slower reaction time (response time), and this shortcoming is that the structural detail by LCD is caused.
All pixels of LCD are produced by colored filter (color filter), each pixel comprises respectively in order to produce redness, green and three blue sub-pixels, and the reaction time of each pixel is then depended on transistorized unlatching of controlling (turn on) and the speed of closing (turn off) once more.Wherein, slow excessively transistor reaction time can influence the effect when using LCD performance electronic game (video games) or film (movies); That is to say, because the speed of mobile object is too fast in electronic game recreation or the film, cause the transistor reaction time of some pixel not catch up with, make the user can see at the edge of this mobile object when watching mobile object in electronic game or the film to move and track (trailing effect) that scintillation effect produced, generally this track is called ghost image (ghosting effect).Therefore, in the manufacturing technology of LCD, desire realizes that the image performance of the LCD of high image quality must solve the problem of ghost image.
Though the improvement of LCD aspect hardware shortened the reaction time of causing ghost image significantly, yet its cost is that the fabricator must pay higher manufacturing cost.On the other hand, the demand for the large scale liquid crystal display on the market also increases day by day, but desire is made large scale, the LCD in little reaction time but is very difficult technically, and reason is to eliminate the ghost image of large scale liquid crystal display.Yet, the present method that can not detect and eliminate the ghost image of LCD on the market effectively.
Summary of the invention
In order to address the above problem, the present invention uses the digitized video treatment technology to detect and to eliminate the ghost image of LCD.The algorithm that this case provided is very simple, also do not have complexity in enforcements, can be at a low price general and have the LCD lifting in the reaction time of length relatively and become and have the very display quality of excellence by the technology of using this case.
Fundamental purpose of the present invention provides a kind of detection method and removing method of ghost image of LCD, the image input data end that it can directly apply to LCD, can also be integrated into LCD control integrated circuit (IC) in.
According to conception of the present invention, a kind of detection and removing method of ghost image of LCD is provided, comprise the following steps: to provide human vision to persist the time; Provide the maximum color of this LCD to change speed; Calculating this human vision persists the product of time and this maximum color change speed and gets threshold value; The pixel key element of calculating this LCD provide first frame first constantly and second the densimetric fraction change amount between constantly of second frame is provided; And relatively this threshold value and this densimetric fraction change amount, make this threshold value greater than this densimetric fraction change amount, to detect and to eliminate ghost image.
According to a scheme of the present invention, a kind of detection method of ghost image of LCD is provided, comprise the following steps: that (a) provides human vision to persist the time; (b) provide the maximum color of this LCD to change speed; (c) calculating this human vision persists the product of time and this maximum color change speed and gets threshold value; (d) the pixel key element of calculating this LCD provide first frame first constantly and second the densimetric fraction change amount between constantly of second frame is provided; And (e) relatively this threshold value and this densimetric fraction change amount, if this threshold value is less than this densimetric fraction change amount, then this pixel key element has ghost image.
According to the detection method of such scheme, wherein: ghost image comprises track effect and scintillation effect; This human vision persist the time greater than 0 less than 20 milliseconds; Be applied to this LCD with real-time mode, this method is represented with false code; Step (b) also comprises the following steps: to be engraved at first o'clock provides first frame on this LCD, this moment, this pixel key element had first densimetric fraction; Being engraved at second o'clock provides second frame on this LCD, this moment, this pixel key element had second densimetric fraction; And the variable quantity that calculates this first densimetric fraction and this second densimetric fraction with respect to this first constantly with this second constantly slope of variable quantity, this slope is this maximum color and changes speed.
According to another program of the present invention, a kind of removing method of ghost image of LCD is provided, comprise the following steps: that (a) provides human vision to persist the time; (b) provide the maximum color of this LCD to change speed; (c) calculating this human vision persists the product of time and this maximum color change speed and gets threshold value; (d) the pixel key element of calculating this LCD provide first frame first constantly and second the densimetric fraction change amount between constantly of second frame is provided; And, make this threshold value greater than this densimetric fraction change amount (e) with respect to this densimetric fraction change amount of this threshold value correction, to eliminate ghost image.
According to the removing method of such scheme, wherein: ghost image comprises track effect and scintillation effect; Wherein this human vision persist the time greater than 0 less than 20 milliseconds; Be applied to this LCD with real-time mode, this method is represented with false code; Step (b) also comprises the following steps: to be engraved at first o'clock provides first frame on this LCD, this moment, this pixel key element had first densimetric fraction; Being engraved at second o'clock provides second frame on this LCD, this moment, this pixel key element had second densimetric fraction; And the variable quantity that calculates this first densimetric fraction and this second densimetric fraction with respect to this first constantly with this second constantly slope of variable quantity, this slope is this maximum color and changes speed.
According to another program of the present invention, a kind of removing method of ghost image of LCD is provided, comprise the following steps: that (a) provides human vision to persist the time; (b) on this LCD, provide first frame and second frame constantly respectively in first moment and second, it has first densimetric fraction and second densimetric fraction respectively, and the variable quantity of this first densimetric fraction and this second densimetric fraction determines the maximum color change speed of this LCD with respect to this first moment and the slope of the variable quantity in this second moment; (c) at least one the 3rd o'clock between this first moment and this second moment is engraved in the 3rd frame is provided on this LCD, the 3rd frame has the triple density level, and the variable quantity of this triple density level and this first densimetric fraction determines the analog color change speed of this LCD with respect to the 3rd moment and the slope of the variable quantity in this first moment; (d) calculating this human vision persists the product of time and this maximum color change speed and gets threshold value; (e) the pixel key element of calculating this LCD provide first frame first constantly and second the densimetric fraction change amount between constantly of second frame is provided; And, make this threshold value greater than this densimetric fraction change amount (f) with respect to this densimetric fraction change amount of this threshold value correction, to eliminate ghost image.
According to the removing method of such scheme, wherein: ghost image comprises track effect and scintillation effect; This human vision persist the time greater than 0 less than 20 milliseconds.
Algorithm provided by the present invention is very simple, also do not have complexity in enforcements, the technology of the application of the invention can be at a low price general and LCD lifting with long relatively reaction time become and have the very display quality of excellence.Therefore, the present invention can effectively reduce the manufacturing cost of high quality lcd.
By following accompanying drawing and detailed description, understanding the present invention that can be more deep.
Description of drawings
Fig. 1 is the synoptic diagram of the detection method of ghost image that the present invention carries;
Fig. 2 carries the synoptic diagram of the null method of first kind of ghost image for the present invention;
Fig. 3 carries the synoptic diagram of the null method of second kind of ghost image for the present invention; And
Fig. 4 is the detection of ghost image that the present invention carries and the process flow diagram of removing method.
Embodiment
(1) detection method of ghost image
In order to improve ghost image, method provided by the present invention must detect effectively and the identification meeting causes pixel in the image input data of ghost image.Yet ghost image is a kind of visual phenomenon and has different variations for different observers; When the image of fast moving is presented on the LCD, can observe the effect of two kinds of different kenels: track effect (trail effect) and scintillation effect (blinkingeffect).These two kinds of effects all are that the two all can be considered ghost image because the slower reaction time of transistor causes.The present invention is directed to these two kinds of effects the reason that causes these two kinds of effects theory behind is provided, can serve as that guiding can be found out and detects and the identification meeting causes the method for the pixel of ghost image with this theory.
See also Fig. 1, it is the synoptic diagram of the detection method of ghost image that the present invention carries, and wherein transverse axis is the time, and the longitudinal axis is the densimetric fraction (intensity level) of pixel key element (pixel component).
By among the figure as can be known, the densimetric fraction (intensitylevel) of the red key element of a known pixels (red component) is at first frame (frame) R
nGo up by R
nBecome the second frame R
N+1, for the Thin Film Transistor-LCD of major part, panel can be for the first frame R arbitrarily
nShowing next frame R
N+1(frame pitch is generally 33ms for the 30ps image) successfully changes over densimetric fraction required level before.Yet human eye can more easily be perceived change color in the mode that surpasses frame frequency (frame rate).
As shown in Figure 1, t
pBe the human retentivity time of eye; That is the time of human brain aware processes or human eye retina time of keeping an image, wherein t
pValue varies with each individual, but usually less than 20ms.Therefore, human vision just can next frame show before seize certain color on a bit.As shown in Figure 1, if fast inadequately if the speed of LCD is discovered in human vision on this aspect of this color of this pixel, just could not change into required color R
N+1Following in this situation, human vision just can be observed another different color R ｀
N+1, then at next t
pAfterwards just can perceive required color R
N+1Can stay a track effect on the mobile pixel lagging behind for discovering of different colours in the frame pitch (frame interval).In addition, when the out-of-shape of mobile object (for example books of Yi Donging), the edge of this object also can produce scintillation effect.
More than narrated the generation reason of ghost image, so the present invention can provide in order to detect the method for the pixel that produces ghost image according to this theory.
In Fig. 1, threshold value Th
fValue be human retentivity time of eye t
pIn, the LCD maximum color change amount that can reach, therefore, if the densimetric fraction change amount of the color element of a known pixels is greater than threshold value Th
f, LCD just can't persist in human vision reaches required level in the time, and this pixel just can produce ghost image.By using this simple method, cause the pixel of ghost image and just can in an image frame, be come out by identification.
In order to implement the ghost image detection algorithm, must utilize following formula calculated threshold Th earlier
f:
Th
f＝t
pxV
LCDf
T wherein
pFor about human vision persists the time, and V
LCDfBe the decline rate of LCD with respect to color change.
The human vision time of persisting varies with each individual, so its numerical value can only be estimated that its numerical value can be simulated the performance of cathode-ray tube display.For instance, with the performance of the screen refresh rate of 85Hz simulation cathode-ray tube display, then t
pJust be 12ms.
The speed of color change is relevant with the reaction time, and it can be provided by the manufacturing of LCD.LCD with shorter reaction time can change color quickly, and is inequality usually for the speed of the color change that descends or rise, and therefore need calculate different threshold values for the color element that descends and rise.
The detection method of ghost image that the present invention carries (real-time) mode in real time is applied to the show image frame of this LCD, and it can be represented by following false code (Pseudo Code):
//Loop?through?each?pixel
IF?pixel.red.next>pixel.red //rising
IF?pixel，red.next-pixel，red>THRESHOLD.RED.RISING
Ghosting?effect?caused?by?red?components，ghostiug?effect?remm)al?process
needed
END
ELSE //falling
IF?pixel.red-pixel.red.uext>THRESHOLD.RED.FALLING
Ghosting?effect?caused?by?red?componts，ghostiug?effect?removal?process
ueeded
END
END//red?componen￠
IF?pixel.greeu.next>pixel.green//rising
IF?pixel.green，uext-pixel.green>THRESHOLD.GREEN.RISING
Ghosting?effect?caused?by?green?components，ghosting?effect?removal
process?needed
END
ELSE //falling
IF?pixel.green-pixel.green.next>THRESHOLD.GREEN.FALLING
Ghosting?effect?causedbygreen?components，ghosting?effect?removal
process?needed
END
END//green?component
IF?pixel.blue.uext>pixel.blue //rising
IF?pixel.blue.next-pixel.blue>THRESHOLD.BLUE.RISING
Ghosting?effect?caused?by?blue?components，ghosting?effect?removal?process
needed
END
ELSE //falling
IF?pixel.blue-pixel.blue.next>THRESHOLD.BLUE.FALLING
Ghosting?effect?caused?by?blue?components，ghosting?effect?removal?process
needed
END
END@@blue?component
The removing method of (2) first kinds of ghost images
In order to eliminate ghost image, two kinds of algorithms are provided, wherein first kind of algorithm is in order to avoid the discovering to eliminate ghost image of two kinds of different colours during the frame pitch.
Persist the color change amount of the maximum that the institute of LCD in the time can reach because threshold value is a human vision, therefore only need the densimetric fraction of this pixel of correction to make its change amount get final product less than this threshold value.By this method, LCD just can persist the densimetric fraction that reaches correction in the time in human vision, and it can stop further to change this level in frame pitch.Therefore, in frame pitch, only can perceive solid color.
Fig. 2 carries the synoptic diagram of the null method of first kind of ghost image for the present invention, and wherein the densimetric fraction of the red key element of pixel is changed to R ｀ n+1 and makes LCD can reach this densimetric fraction among human vision persists time tp.This algorithm also can combine with detection algorithm, and the false code of institute's combination is as follows:
/]Loop?through?each?pixel
{
IF?pixel.red.next>pixel.red //rising
IF?pixel.red.next-pixel.red>THRESHOLD.RED.RISING
pixel.red.next＝pixel.red+THRESHOLD.RED.RISING；
END
ELSE //falling
IF?pixel.red-pixel.red.next>THRESHOLD.RED.FALLING
pixel.red.next＝pixel.red-THRESHOLD.RED.FALLING；
END
END//red?component
IF?pixel.green.next>pixel.green //rising
IF?pixel.green.next-pixel.green.next>THRESHOLD.GREEN.RISING
pixel.green，next＝pixel.green+THRESHOLD.GREEN.RISING；
END
ELSE //falling
IF?pixel.green.next-pixel.green.next>THRESHOLD.GREEN.FALLING
pixel.green.next＝pixel.green-THRESHOLD.GREEN.FALLING；
END
END//green?component
IF?pixel.blue.next>pixel.blue //rising
IF?pixel.blue.next-pixel.blue>THRESHOLD.BLUE.RISING
，pixel.blue.next＝pixel.blue+THRESHOLD.BLUE.RISING；
END
ELSE //folli@g
IF?pixel.blue-pixel.bluea.next>THRESHOLD.BLUE.FALLING
pixel.blue.next＝pixel.blue-THRESHOLD.BLUE.FALLING；
END
END//blue?compoment
Result of experiment of the present invention shows that the removing method of this first kind of ghost image can eliminate ghost image very effectively, particularly eliminate scintillation effect.
The removing method of (3) second kinds of ghost images
The shortcoming of the removing method of the first kind of ghost image words of observing that are only to be careful still can be discovered color change (color alterations); This is that color can't be changed into required level because for the pixel that causes ghost image in frame pitch, and its purpose of the removing method of second kind of ghost image is promptly addressing this problem.
Suppose that we can reach signal change faster, LCD just can be compelled to carry out refreshing of one or many with respect to the pixel that causes ghost image in frame pitch.
As shown in Figure 3, just can simulate this algorithm by in the frame (n and n+1 constantly) of two adjacency, inserting one or more new frames.The densimetric fraction of the frame that is inserted into, makes LCD persist in human vision and reaches this color in the time to set according to the removing method of aforementioned first kind of ghost image; That is, be inserted into a plurality of frames after, the densimetric fraction (color) of the pixel key element of LCD n begins constantly by first, process is middle at least one (a plurality of) changes to the required level of second moment n+1 constantly, constantly, makes required color to be reached when frame pitch finishes.As shown in Figure 3, show the situation that adds one and two frame respectively among the figure.
At last, Fig. 4 is the detection of ghost image that the present invention carries and the process flow diagram of removing method, can be known by this figure and understand technology of the present invention.
In sum, the method of detection provided by the present invention and elimination ghost image can detect and eliminate the ghost image of LCD effectively, its algorithm on the implementation not only simply also can be too not complicated, it also for being implemented on a kind of inexpensive method of all LCD at present, helps to reduce the required cost of the LCD of producing high display quality simultaneously.
Under the prerequisite that does not break away from as the protection domain of claims, the present invention can make various modifications by those skilled in the art.
Claims (13)
1. the detection method of the ghost image of a LCD comprises the following steps:
(a) provide human vision to persist the time;
(b) provide the maximum color of this LCD to change speed;
(c) calculating this human vision persists the product of time and this maximum color change speed and gets threshold value;
(d) the pixel key element of calculating this LCD provide first frame first constantly and second the densimetric fraction change amount between constantly of second frame is provided; And
(e) relatively this threshold value and this densimetric fraction change amount, if this threshold value is less than this densimetric fraction change amount, then this pixel key element has ghost image.
2. detection method as claimed in claim 1, wherein ghost image comprises track effect and scintillation effect.
3. detection method as claimed in claim 1, wherein this human vision persist the time greater than 0 less than 20 milliseconds.
4. detection method as claimed in claim 1, wherein step (b) also comprises the following steps:
Being engraved at first o'clock provides first frame on this LCD, this moment, this pixel key element had first densimetric fraction;
Being engraved at second o'clock provides second frame on this LCD, this moment, this pixel key element had second densimetric fraction; And
The variable quantity that calculates this first densimetric fraction and this second densimetric fraction is with respect to the slope of this first moment with the variable quantity in this second moment, and this slope is this maximum color and changes speed.
5. detection method as claimed in claim 1 is applied to this LCD with real-time mode, and this method is represented with false code.
6. the removing method of the ghost image of a LCD comprises the following steps:
(a) provide human vision to persist the time;
(b) provide the maximum color of this LCD to change speed;
(c) calculating this human vision persists the product of time and this maximum color change speed and gets threshold value;
(d) the pixel key element of calculating this LCD provide first frame first constantly and second the densimetric fraction change amount between constantly of second frame is provided; And
(e), make this threshold value greater than this densimetric fraction change amount, to eliminate ghost image with respect to this densimetric fraction change amount of this threshold value correction.
7. removing method as claimed in claim 6, wherein ghost image comprises track effect and scintillation effect.
8. removing method as claimed in claim 6, wherein this human vision persist the time greater than 0 less than 20 milliseconds.
9. removing method as claimed in claim 6, wherein step (b) also comprises the following steps:
Being engraved at first o'clock provides first frame on this LCD, this moment, this pixel key element had first densimetric fraction;
Being engraved at second o'clock provides second frame on this LCD, this moment, this pixel key element had second densimetric fraction; And
The variable quantity that calculates this first densimetric fraction and this second densimetric fraction is with respect to the slope of this first moment with the variable quantity in this second moment, and this slope is this maximum color and changes speed.
10. removing method as claimed in claim 6 is applied to this LCD with real-time mode, and this method is represented with false code.
11. the removing method of the ghost image of a LCD comprises the following steps:
(a) provide human vision to persist the time;
(b) on this LCD, provide first frame and second frame constantly respectively in first moment and second, it has first densimetric fraction and second densimetric fraction respectively, and the variable quantity of this first densimetric fraction and this second densimetric fraction determines the maximum color change speed of this LCD with respect to this first moment and the slope of the variable quantity in this second moment;
(c) at least one the 3rd o'clock between this first moment and this second moment is engraved in the 3rd frame is provided on this LCD, the 3rd frame has the triple density level, and the variable quantity of this triple density level and this first densimetric fraction determines the analog color change speed of this LCD with respect to the 3rd moment and the slope of the variable quantity in this first moment;
(d) calculating this human vision persists the product of time and this maximum color change speed and gets threshold value;
(e) the pixel key element of calculating this LCD provide first frame first constantly and second the densimetric fraction change amount between constantly of second frame is provided; And
(f), make this threshold value greater than this densimetric fraction change amount, to eliminate ghost image with respect to this densimetric fraction change amount of this threshold value correction.
12. removing method as claimed in claim 11, wherein ghost image comprises track effect and scintillation effect.
13. removing method as claimed in claim 11, wherein this human vision persist the time greater than 0 less than 20 milliseconds.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101295947A CN100460967C (en) | 2005-12-14 | 2005-12-14 | Method for inspecting and eliminating liquid-crystal display device ghost image |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101295947A CN100460967C (en) | 2005-12-14 | 2005-12-14 | Method for inspecting and eliminating liquid-crystal display device ghost image |
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| Publication Number | Publication Date |
|---|---|
| CN1982998A CN1982998A (en) | 2007-06-20 |
| CN100460967C true CN100460967C (en) | 2009-02-11 |
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| CNB2005101295947A Expired - Fee Related CN100460967C (en) | 2005-12-14 | 2005-12-14 | Method for inspecting and eliminating liquid-crystal display device ghost image |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09330062A (en) * | 1996-06-13 | 1997-12-22 | Hitachi Ltd | Liquid crystal display device |
| US20010015725A1 (en) * | 2000-01-18 | 2001-08-23 | Kunifumi Nakanishi | System and method for adjusting image quality of liquid crystal display |
| CN1635403A (en) * | 2003-12-25 | 2005-07-06 | 联想(北京)有限公司 | Method and apparatus for eliminating LCD frame flicker phenomenon |
-
2005
- 2005-12-14 CN CNB2005101295947A patent/CN100460967C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09330062A (en) * | 1996-06-13 | 1997-12-22 | Hitachi Ltd | Liquid crystal display device |
| US20010015725A1 (en) * | 2000-01-18 | 2001-08-23 | Kunifumi Nakanishi | System and method for adjusting image quality of liquid crystal display |
| CN1635403A (en) * | 2003-12-25 | 2005-07-06 | 联想(北京)有限公司 | Method and apparatus for eliminating LCD frame flicker phenomenon |
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| CN1982998A (en) | 2007-06-20 |
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