CN102024439A - Method for eliminating image residues of liquid crystal display - Google Patents
Method for eliminating image residues of liquid crystal display Download PDFInfo
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- CN102024439A CN102024439A CN 201010624096 CN201010624096A CN102024439A CN 102024439 A CN102024439 A CN 102024439A CN 201010624096 CN201010624096 CN 201010624096 CN 201010624096 A CN201010624096 A CN 201010624096A CN 102024439 A CN102024439 A CN 102024439A
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Abstract
The invention discloses a method for eliminating image residues of a liquid crystal display. The method mainly comprises the following steps: storing one group or multiple groups of look-up tables for correcting Gamma in the liquid crystal display, wherein each group comprises an R-channel look-up table, a G-channel look-up table and a B-channel look-up table, and each group of look-up tables are different; and correcting the liquid crystal display by alternately using different look-up tables at the fixed time to force liquid crystal molecules to be properly twisted, thereby avoiding the residual images generated by that the liquid crystal molecules in the liquid crystal display keep still for a long time, i.e. eliminating the image residues of the liquid crystal display by adopting dynamic Gamma correction. The whole method is simple, convenient and effective, does not influence the display content, and not only is suitable for various liquid crystal displays but also has certain effect on other displays with image residue effect.
Description
Technical field
The present invention relates to a kind of residual method of LCD image of eliminating.
Background technology
LCD is long-time to show fixing picture, when switching to other picture, and the indistinct image of residual former fixed image, this phenomenon is exactly an image residue.Ion is contained in general liquid crystal cell inside, when showing fixed image for a long time, free ion can move toward upper and lower two electrode direction of liquid crystal cell along the direction of liquid crystal pretilt angle, and at the oriented layer surface aggregation, when ion aggregation arrives enough driving voltages, can make liquid crystal molecule produce polarization phenomena, cause driving voltage that liquid crystal molecule is not produced effect, this time image switching, the ion of having assembled can not leave the oriented layer surface at once, the penetrance that continues to observe habitat is different with other place, be exactly image residue.Therefore,, avoid image residue, just become the problem to be solved in the present invention by regularly suitably reversing liquid crystal molecule weakens the ion aggregation phenomenon.
Summary of the invention
In view of above-mentioned LCD shows fixed image for a long time, the phenomenon that may cause image residue, the present invention aims to provide a kind of method that adopts dynamic Gamma to proofread and correct, and eliminates LCD in the mode that shows by turns and shows fixed image for a long time and residual image.
The present invention realizes by following steps:
A kind of residual method of LCD image of eliminating, adopt dynamic Gamma curvature correction LCD, concrete steps comprise: display is arranged on not correcting state, measures display and import full black burst until import the continuous GTG brightness N_Y of complete white field signal
iAnd colourity (N_x
i, N_y
i), be recorded as eigenwert, determine the depth D and the width W of LCD look-up table, W＞D, the degree of depth and width with method of interpolation expansion computation of characteristic values make it reach the width of look-up table.Then, according to one or more groups object brightness of depth calculation T_Y of look-up table
iWith target colourity (T_x
i, T_y
i), with eigenwert (N_Y
i, N_x
i, N_y
i) be converted to corresponding (N_R
i, N_G
i, N_B
i), with target (T_Y
i, T_x
i, T_y
i) be converted to corresponding (T_R
i, T_G
i, T_B
i); Or only carry out the conversion of (R, G, B) triple channel value according to brightness value, that is, and with eigenwert (N_Y
i, N_x
i, N_y
i) be converted to corresponding (N_R
i, N_G
i, N_B
i) time, N_x
iAnd N_y
iValue be respectively N_Y
iWith target (T_Y
i, T_x
i, T_y
i) be converted to corresponding (T_R
i, T_G
i, T_B
i) time, T_x
iAnd T_y
iValue be respectively T_Y
iAs object brightness T_Y
iDuring for many groups, with the desired value (T_R after each group conversion
i, T_G
i, T_B
i) respectively with eigenwert (N_R
i, N_G
i, N_B
i) compare, search to draw and respectively organize look-up table; Or as object brightness T_Y
iWhen being one group, with the desired value (T_R after one group of conversion
i, T_G
i, T_B
i) and eigenwert (N_R
i, N_G
i, N_B
i) compare, search and draw one group of look-up table, to search the one group of look-up table that obtains and take advantage of different coefficients to obtain one or more groups other look-up table, coefficient is between 0.8～0.995.At last, each group look-up table is embedded in the firmware of LCD, time in turn calls and respectively organizes look-up table in firmware, display is carried out dynamic Gamma proofread and correct.
The depth D of described look-up table is 256 or 512 or higher, and the width W of look-up table is 1024 or 2048 or higher.
Described one or more groups target brightness value can be according to formula:
Y
i＝(Y
Max-Y
Min)×[i/(D-1)]
g+Y
Min，
Calculate, wherein i for the GTG order promptly 0,1,2...... (D-1), Y
MaxBe white field signal brightness, Y
MinBe black burst brightness, g is an index, g=1.8,2.0 or 2.2, and one or more groups target brightness value is corresponding to the different values of index g in the formula.
Described one or more groups target brightness value also can be the luminosity response value of DICOM or CIELAB standard.
The objectives brightness value that satisfies display effect that described one or more groups target brightness value is also set.
(x y) is (0.313,0.329), (0.299,0.315) or (0.283,0.297) to described target chromatic value.
Described conversion formula is:
X
i＝x
i/y
i×Y
i，Y
i＝Y
i，Z
i＝(1-x
i-y
i)/y
i×Y
i；
A kind of display correction method of the present invention, by measuring the luminosity response eigenwert and the chromaticity value of LCD, determine the degree of depth and the width of the look-up table of LCD, eigenwert is carried out necessary expansion calculate and calculate one or more groups luminosity response desired value and colourity desired value, after converting RGB triple channel value respectively to, desired value and eigenwert compare again, draw one or more groups look-up table, wherein, one group of look-up table takes advantage of different coefficients to obtain one or more groups other look-up table, setting time in turn by the firmware in the LCD calls and respectively organizes look-up table, thereby the dynamic Gamma that realizes LCD proofreaies and correct, both made LCD show fixed image for a long time, also can force liquid crystal molecule regularly to carry out necessary reversing, effectively avoid afterimage phenomenon, this dynamic Gamma trimming process is simple, convenient, effectively, be applicable to that various liquid crystal or non-LCD are carried out image residue to be eliminated.
Description of drawings
Fig. 1 is a kind of structure flow chart of eliminating the residual method of LCD image of the present invention;
The curve map that Fig. 2 is 1.8 o'clock table of corrections for g index of the present invention;
The curve map that Fig. 3 is 2.0 o'clock table of corrections for g index of the present invention;
The curve map that Fig. 4 is 2.2 o'clock table of corrections for g index of the present invention.
Embodiment
As shown in Figure 1, a kind of residual method of LCD image of eliminating of the present invention adopts dynamic Gamma to proofread and correct the image residue of eliminating LCD.Its concrete steps comprise:
Step 11: LCD is arranged on not correcting state, measures LCD and import full black burst until import the continuous GTG brightness N_Y of complete white field signal
iAnd colourity (N_x
i, N_y
i).
Full black burst is the black window signal of LCD just, and complete white field signal is exactly the white window signal of LCD, and brightness N_Y
iAnd colourity (N_x
i, N_y
i) be exactly the eigenwert that the present invention wants the LCD self of proofreading and correct.
Step 12: determine the degree of depth and the width of the look-up table of LCD, the degree of depth is designated as D, and width is designated as W, W＞D.
The depth D of look-up table=256, W=1024, it is the exponent number of LCD, certainly, the degree of depth of look-up table also can be 512 or 1024 or higher, and the width of look-up table also can be 2048 or 4096 or higher, it is decided according to exploration on display resolution ratio, does not enumerate one by one at this.
Step 13: with the degree of depth and the width that width reaches look-up table, the i.e. N_Y of method of interpolation expansion computation of characteristic values
0, N_Y
1, N_Y
2... N_Y
W-1
Step 14: according to three groups of object brightness T_Y of depth calculation of look-up table
iAnd colourity (T_x
i, T_y
i), the typical Gamma curvilinear function of target brightness value basis:
Y
i＝(Y
Max-Y
Min)×[i/(D-1)]
g+Y
Min
Calculate, wherein i for the GTG order promptly 0,1,2...... (D-1), Y
MaxBe white field signal brightness N_Y
W-1, Y
MinBe black burst brightness N_Y
0, g is an index, g=1.8,2.0 and 2.2 calculates three groups of data, and Y when setting g=1.8
Max=1.0 * N_Y
W-1, Y during g=2.0
Max=0.95 * N_Y
W-1, Y during g=2.2
Max=0.9 * N_Y
W-1
Colourity (T_x
i, T_y
i) choose corresponding three groups of data (0.313,0.329), (0.299,0.315) and (0.283,0.297).
Step 15: with feature (N_Y
i, N_x
i, N_y
i) be converted to corresponding (N_R
i, N_G
i, N_B
i), with target (T_Y
i, T_x
i, T_y
i) be converted to corresponding (T_R
i, T_G
i, T_B
i), conversion formula is as follows:
X
i＝x
i/y
i×Y
i，Y
i＝Y
i，Z
i＝(1-x
i-y
i)/y
i×Y
i；
Step 16: each group desired value is compared with eigenwert respectively, search to draw and respectively organize look-up table.Promptly respectively at the eigenwert N_R on W rank
i, N_G
i, N_B
iIn find out the order that desired value is approached on the D rank most, what the tables of data of being made up of successively these each orders was R, G, B respectively organizes look-up table.As Fig. 2, Fig. 3, shown in Figure 4, it is respectively 1.8,2.0,2.2 o'clock three groups of used look-up tables of LCD for the g index.
Step 17: three groups of look-up tables with R, G, B are proofreaied and correct displays, and call according to the setting time in turn of firmware and respectively to organize look-up table and implement dynamic Gamma and proofread and correct, with the image residue of effective elimination LCD.
Certainly, above-mentioned bearing calibration is a specific implementation process, and implementation method of the present invention is not limited thereto.
As, in the above-mentioned steps 14, the value of g also can be single numerical value, and the look-up table that the later stage produces also is one group, one group of look-up table obtains one or more groups look-up table in addition by multiply by different coefficients, so just can carry out dynamic Gamma according to many groups look-up table and proofread and correct.Wherein, the span of coefficient is between 0.8～0.995, as 0,815,0.855,0.885,0.9,0.954 or the like.As look-up table be (0,10,19,31 ..., 1023) time, behind the multiplying factor 0.90, just obtain look-up table for (0,9,17,28 ..., 921).
And for example, target brightness value also can be calculates by the described formula of step 14 in said process, but selects the luminosity response value of DICOM or CIELAB standard for use, even also can be set at the objectives brightness value that satisfies display effect and replace.
For another example, in the above-mentioned steps 15, look-up table also can only be searched by brightness value and obtain.That is, with eigenwert (N_Y
i, N_x
i, N_y
i) be converted to corresponding (N_R
i, N_G
i, N_B
i) time, N_x
iAnd N_y
iValue be respectively N_Y
iWith target (T_Y
i, T_x
i, T_y
i) be converted to corresponding (T_R
i, T_G
i, T_B
i) time, T_x
iAnd T_y
iValue be respectively T_Y
i(R, G, B) triple channel value is used the same brightness look-up table to search and is obtained.
The above; the embodiment of recommending for the present invention only, but protection scope of the present invention is not limited thereto anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (8)
1. eliminate the residual method of LCD image for one kind, it is characterized in that, adopt dynamic Gamma curvature correction LCD, concrete steps comprise:
A) display is arranged on not correcting state, measures display and import full black burst until import the continuous GTG brightness N_Y of complete white field signal
iAnd colourity (N_x
i, N_y
i), be recorded as eigenwert;
B) determine the depth D and the width W of LCD look-up table, W＞D;
C) with the degree of depth and the width of method of interpolation expansion computation of characteristic values, make it reach the width of look-up table;
D) according to one or more groups object brightness of depth calculation T_Y of look-up table
iWith target colourity (T_x
i, T_y
i);
E) with eigenwert (N_Y
i, N_x
i, N_y
i) be converted to corresponding (N_R
i, N_G
i, N_B
i), with target (T_Y
i, T_x
i, T_y
i) be converted to corresponding (T_R
i, T_G
i, T_B
i);
Or, only carry out the conversion of (R, G, B) triple channel value according to brightness value, that is, and with eigenwert (N_Y
i, N_x
i, N_y
i) be converted to corresponding (N_R
i, N_G
i, N_B
i) time, N_x
iAnd N_y
iValue be respectively N_Y
iWith target (T_Y
i, T_x
i, T_y
i) be converted to corresponding (T_R
i, T_G
i, T_B
i) time, T_x
iAnd T_y
iValue be respectively T_Y
i
F) as object brightness T_Y
iDuring for many groups, with the desired value (T_R after each group conversion
i, T_G
i, T_B
i) respectively with eigenwert (N_R
i, N_G
i, N_B
i) compare, search to draw and respectively organize look-up table;
Or, as object brightness T_Y
iWhen being one group, with the desired value (T_R after one group of conversion
i, T_G
i, T_B
i) and eigenwert (N_R
i, N_G
i, N_B
i) compare, search and draw one group of look-up table, to search the one group of look-up table that obtains and take advantage of different coefficients to obtain one or more groups other look-up table, coefficient is between 0.8～0.995;
G) each group look-up table is embedded in the firmware of LCD, time in turn calls and respectively organizes look-up table in firmware, display is carried out dynamic Gamma proofread and correct.
2. the residual method of elimination LCD image according to claim 1 is characterized in that, the depth D of look-up table is 256 or 512 or higher, and the width W of look-up table is 1024 or 2048 or higher.
3. a kind of residual method of LCD image of eliminating according to claim 1 is characterized in that, one or more groups target brightness value can be according to formula among the described step D:
Y
i＝(Y
Max-Y
Min)×[i/(D-1)]
g+Y
Min，
Calculate, wherein i for the GTG order promptly 0,1,2...... (D-1), Y
MaxBe white field signal brightness, Y
MinBe black burst brightness, g is an index, and one or more groups target brightness value is corresponding to the different values of index g in the formula.
4. a kind of residual method of LCD image of eliminating according to claim 3 is characterized in that described g=1.8,2.0 or 2.2.
5. a kind of residual method of LCD image of eliminating according to claim 1 is characterized in that one or more groups target brightness value also can be the luminosity response value of DICOM or CIELAB standard among the described step D.
6. a kind of residual method of LCD image of eliminating according to claim 1 is characterized in that, the objectives brightness value that satisfies display effect that one or more groups target brightness value is also set among the described step D.
7. a kind of residual method of LCD image of eliminating according to claim 1 is characterized in that, (x y) is (0.313,0.329), (0.299,0.315) or (0.283,0.297) to target chromatic value among the described step D.
8. a kind of residual method of LCD image of eliminating according to claim 1 is characterized in that the conversion formula in the described step e is:
X
i＝x
i/y
i×Y
i，Y
i＝Y
i，Z
i＝(1-x
i-y
i)/y
i×Y
i；
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|---|---|---|---|
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| CN 201010624096 CN102024439A (en) | 2010-12-31 | 2010-12-31 | Method for eliminating image residues of liquid crystal display |
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| CN103700335A (en) * | 2013-12-26 | 2014-04-02 | Tcl新技术（惠州）有限公司 | Method and device for adjusting target Gamma curve |
| CN104950494A (en) * | 2015-07-28 | 2015-09-30 | 京东方科技集团股份有限公司 | Residual image testing method and device and residual image eliminating method and device |
| CN106297703A (en) * | 2016-08-31 | 2017-01-04 | 深圳市华星光电技术有限公司 | Gamma electric voltage generative circuit and liquid crystal display |
| CN106409219A (en) * | 2016-06-06 | 2017-02-15 | 深圳市华星光电技术有限公司 | Precompensation method and device for regulating brightness and chroma of panel |
| CN108447456A (en) * | 2018-02-28 | 2018-08-24 | 北京德为智慧科技有限公司 | A kind of image shows bearing calibration and device |
| WO2020082519A1 (en) * | 2018-10-22 | 2020-04-30 | 惠科股份有限公司 | Method and device for brightness correction of display panel |
| CN113192469A (en) * | 2021-04-28 | 2021-07-30 | 深圳市巨烽显示科技有限公司 | Display screen ghost eliminating method and device, computer equipment and storage medium |
| CN117253459A (en) * | 2023-11-20 | 2023-12-19 | 汕头市超声仪器研究所股份有限公司 | Gamma adjustment method for liquid crystal display |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700335A (en) * | 2013-12-26 | 2014-04-02 | Tcl新技术（惠州）有限公司 | Method and device for adjusting target Gamma curve |
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| CN106409219B (en) * | 2016-06-06 | 2019-07-02 | 深圳市华星光电技术有限公司 | Adjust the precompensation method and device of panel luminance and coloration |
| CN106409219A (en) * | 2016-06-06 | 2017-02-15 | 深圳市华星光电技术有限公司 | Precompensation method and device for regulating brightness and chroma of panel |
| CN106297703B (en) * | 2016-08-31 | 2018-12-07 | 深圳市华星光电技术有限公司 | Gamma electric voltage generative circuit and liquid crystal display |
| CN106297703A (en) * | 2016-08-31 | 2017-01-04 | 深圳市华星光电技术有限公司 | Gamma electric voltage generative circuit and liquid crystal display |
| CN108447456A (en) * | 2018-02-28 | 2018-08-24 | 北京德为智慧科技有限公司 | A kind of image shows bearing calibration and device |
| WO2020082519A1 (en) * | 2018-10-22 | 2020-04-30 | 惠科股份有限公司 | Method and device for brightness correction of display panel |
| US11250812B2 (en) | 2018-10-22 | 2022-02-15 | HKC Corporation Limited | Luminance correction method and luminance correction device for display panel |
| CN113192469A (en) * | 2021-04-28 | 2021-07-30 | 深圳市巨烽显示科技有限公司 | Display screen ghost eliminating method and device, computer equipment and storage medium |
| CN113192469B (en) * | 2021-04-28 | 2022-07-05 | 深圳市巨烽显示科技有限公司 | Display screen ghost eliminating method and device, computer equipment and storage medium |
| CN117253459A (en) * | 2023-11-20 | 2023-12-19 | 汕头市超声仪器研究所股份有限公司 | Gamma adjustment method for liquid crystal display |
| CN117253459B (en) * | 2023-11-20 | 2024-01-09 | 汕头市超声仪器研究所股份有限公司 | Gamma adjustment method for liquid crystal display |
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Application publication date: 20110420 |