CN1888954A - Method for eliminating light-emitting diode backlight module support column surrounding shadow - Google Patents
Method for eliminating light-emitting diode backlight module support column surrounding shadow Download PDFInfo
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- CN1888954A CN1888954A CN 200610094519 CN200610094519A CN1888954A CN 1888954 A CN1888954 A CN 1888954A CN 200610094519 CN200610094519 CN 200610094519 CN 200610094519 A CN200610094519 A CN 200610094519A CN 1888954 A CN1888954 A CN 1888954A
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- 238000003379 elimination reaction Methods 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 15
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Abstract
A method for eliminating the shore surrounding shadow of the plane display LBD background light module, including: provides LBD background light module to the plane display, the shore is located in the background light module and between the surrounding LBDs; gets the LBD brightness according to the pixel gray level distribution in the area of the LBD, lights the LBD surrounding the shore by the LBD brightness. The method of the invention can adjust the correlation pixel gray level according to all pixel brightness profile in the area that the several LBDs surround the shore.
Description
Technical field
The present invention is the method for eliminating noise about a kind of basically, particularly about the method for a kind of elimination matrix form light emitting diode (Light Emitting Diode or LED) backlight module support column surrounding shadow.
Background technology
Liquid crystal display backlight module commonly used at present comprises cold cathode fluorescent lamp (Cold CathodeFluorescent Lamp or CCFL) and light emitting diode.Since the advantage of factor such as environmental protection and colour vividness, the existing trend that emerges gradually of light emitting diode.Especially in the field of high comparative liquid crystal display, the high brightness characteristic of light emitting diode more makes traditional cold cathode fluorescent lamp backlight module be difficult to unmatch.
No matter use cold cathode fluorescent lamp or light emitting diode, the function mode of conventional liquid crystal backlight module is that the full wafer backlight module is lighted together, and non local even single independent control.In addition, the optical sheet that cooperates backlight module to use in the conventional liquid crystal often has preferable light diffusing or diffusive, to reach the even of brightness.Yet, in the application of high comparative liquid crystal display, in order to reach preferable contrast, for example more than 10000: 1, the optical plate structure of the control mode of backlight module and collocation all with traditional approach difference even run in the opposite direction to some extent.For example, often need single independent its brightness of control for light emitting diode, and the selecting for use then to be to reach the effect that local luminance concentrates but not to focus on and make the backlight illumination homogenising of optical sheet.
The large scale liquid crystal display panel need install usually several support columns between the optical sheet of backlight module and liquid crystal panel or backlight module and for example diffuser plate etc. so that liquid crystal panel or optical sheet are maintained at fixing level height.Application at high comparative liquid crystal display, because the brightness of light emitting diode is to control respectively separately in the backlight module, add that characteristic is concentrated in the brightness of selected optical sheet as previously mentioned, near the support column brightness may because of around bright-dark degree's difference of light emitting diode or the existence of support column itself, make light refraction or reflection inequality and generation shade.
Fig. 1 shows in the light-emitting diode (LED) backlight module typical support column and the light emitting diode around it and liquid crystal panel or light emitting diode and the synoptic diagram of relative position between the optical sheet of diffuser plate for example, is to be the example explanation with light emitting diode and liquid crystal panel 90 in this is graphic.It comprises support column 10, a plurality of light emitting diode 20 and liquid crystal panel 90.As shown in Figure 1, support column 10 is between four light emitting diodes 20 as purposes backlight, and its purpose is to be liquid crystal panel 90 is maintained at fixing level height as previously mentioned.Since around support column 10 and its around relative position of 20 of light emitting diodes or the support column 10 light emitting diode 20 luminance difference each other can cause that near the pixel backlight module support column 10 has tangible shade on the panel, this shade will further cause near the distortion of real image backlight module support column.
Summary of the invention
Based on above-mentioned problem, it is necessary to propose a kind of method of eliminating the flat-panel screens light-emitting diode backlight module support column surrounding shadow, with the quality of guaranteeing that general image shows.
One of purpose of the present invention promptly is to propose a kind of method of eliminating the flat-panel screens light-emitting diode backlight module support column surrounding shadow, to guarantee that near the real image backlight module support column can distortion.
Another object of the present invention is to propose a kind of flat-panel screens of using light-emitting diode (LED) backlight module, it contains the device of eliminating light-emitting diode backlight module support column surrounding shadow, to guarantee that near the real image backlight module support column can distortion.
Based on above-mentioned purpose, the present invention is in conjunction with support column and the brilliance control and the Flame Image Process of the restriction of relative position between light emitting diode, support column surrounding light emitting diode propose a kind of method of eliminating the flat-panel screens light-emitting diode backlight module support column surrounding shadow on every side.The method mainly comprises: provide light-emitting diode (LED) backlight module for flat-panel screens, it has support column and is positioned at this backlight module, and support column is on every side between the light emitting diode; And distribute obtaining the light-emitting diode luminance value, and light the light emitting diode of support column surrounding with this light-emitting diode luminance value according to the pixel gray level value of light emitting diode region.The method can also comprise: according to the luminance contour of all pixels of a plurality of light emitting diodes of support column surrounding region, to adjust the GTG value of related pixel.
Based on above-mentioned purpose, the present invention also provides a kind of flat-panel screens, comprises: the matrix form light-emitting diode (LED) backlight module, and it has at least one support column and is positioned at this backlight module, and this support column is between adjacent a plurality of light emitting diodes; And backlight control apparatus, it obtaining the light-emitting diode luminance value, and lights this adjacent a plurality of light emitting diodes with this light-emitting diode luminance value according to the distribution of pixel gray level value of this adjacent a plurality of light emitting diodes region simultaneously.
Description of drawings
Many characteristics of the embodiment of this announcement can graphicly further be understood via following.
Fig. 1 shows in the light-emitting diode (LED) backlight module synoptic diagram of relative position between typical support column and light emitting diode around it and liquid crystal panel;
Fig. 2 illustration places its center of light emitting diode on every side with support column;
Fig. 3 shows the flow process according to the light-emitting diode luminance control of a preferred embodiment of the present invention;
Fig. 4 shows the flow process according to the image processing step of a preferred embodiment of the present invention;
Fig. 5 A illustration is asked for the method for reverse adjustment shielding matrix; And
The reverse adjustment shielding matrix of Fig. 5 B illustration acts on the method for support column surrounding light emitting diode coverage area pixel.
[main element label declaration]
10 support columns
20 light emitting diodes
The virtual rectangle that 22 light emitting diodes constitute
The length of side of D1/D2 virtual rectangle
30-36 light-emitting diode luminance controlled step
The 40-44 image processing step
90 liquid crystal panels
50 original GTG matrixes
52 obtain the image gray-scale level matrix
54 reverse adjustment shielding matrixs
56 adjust the GTG matrix
Embodiment
Below will cooperate graphic detailed description according to preferred embodiment of the present invention, different graphic interior identical numbering or marks are represented components identical or notion.
According to a preferred embodiment of the present invention, method of the present invention mainly comprises step (a) and step (b).Step (a) provide light-emitting diode (LED) backlight module for flat-panel screens, and it has support column and is positioned at backlight module, and place it on every side between the light emitting diode support column; Step (b) is the pixel value according to light emitting diode institute coverage area, and the light emitting diode of support column surrounding is controlled in identical brightness, and is backlight uniformly so that support column surrounding has.
Fig. 2 illustration is according to the synoptic diagram of this preferred embodiment step (a) related notion, and it comprises support column 10 and a plurality of light emitting diode 20.In addition, Fig. 2 also comprises virtual rectangle 22.Step (a) places them on every side between a plurality of light emitting diodes 20 support column 10.Suppose length and the wide D1 of being respectively and the D2 of the virtual rectangle 22 that a plurality of light emitting diodes 20 are constituted, then as shown in Figure 2, support column 10 is among virtual rectangle 22 formed projections should place virtual rectangle 22.And the center of support column 10 projection of shape preferably places apart from the length of this virtual rectangle 22 and the center of wide D1/2 of being respectively and D2/2.For example, as if the circle that is projected as of support column 10, then this circle should be positioned among the virtual rectangle 22, and center best and virtual rectangle 22, its center of circle is overlapping, and meaning promptly is positioned at wherein entreats the position.Certainly, the projection of support column 10 on virtual rectangle 22 is not restricted to circle, and it can also be square, rectangle, regular polygon or any symmetric geometry that approximately is symmetrical in its central point.
The step of this preferred embodiment (b) is the pixel value according to light emitting diode institute coverage area, and the light emitting diode 20 around the support column 10 is controlled in uniform brightness.The backlight module light emitting diode 20 actual brightness values of lighting distribute and difference with its pixel intrinsic brilliance that contains.On real the work, the brightness of the arbitrary light emitting diode in the backlight module is determined by the distribution of the pixel intrinsic brilliance in its pixel region of containing.In other words, the pixel intrinsic brilliance in the pixel region contained of arbitrary light emitting diode 20 distributes and can change f via certain
-1And obtain the brightness that this light emitting diode 20 should show.The pixel intrinsic brilliance is anticipated promptly f usually with digitized GTG (gray level) value representation
-1It is a kind of function (function) that the GTG value is converted to the light-emitting diode luminance value.f
-1The conversion details may be with the design specification of each panel different, because of its not within the scope of the invention, so do not repeat them here.
The step of this preferred embodiment (b) can be segmented again again, and its details is shown in Fig. 3.The flow process of Fig. 3 comprises four steps, is respectively: step 30, obtain the view data of support column surrounding light emitting diode coverage area; Step 32, the view data distribution average of calculation procedure 30; Step 34, the view data distribution average that obtains according to step 32 produces the brightness value of support column surrounding light emitting diode; Step 36, the light-emitting diode luminance value that obtains according to step 34 is lighted the light emitting diode of support column surrounding.The so-called view data of step 30 can be the pixel gray level value in the above-mentioned light emitting diode coverage area.For example, suppose the support column surrounding light emitting diode contain n pixel and by the view data that step 30 obtains comprise L1, L2 ..., Ln counts n pixel gray level value, then step 32 can obtain the view data distribution average via calculating (L1+L2+...+Ln)/n.Step 34 item can be utilized step 30 and the 32 view data distribution average that produce, by above-mentioned function f
-1Be converted to the brightness of support column surrounding light emitting diode.Step 36 item further all is set in the light emitting diode of support column surrounding the brightness of step 34 conversion gained by the control signal of controlling light emitting diode.
In the another embodiment of the present invention, above-mentioned steps 32 can also be calculated other kind eigenwert according to the view data that step 30 obtains, and utilizes the eigenwert obtain by above-mentioned function f in step 34 again
-1Be converted to the brightness of support column surrounding light emitting diode.For example, the intermediate value (median value) of the view data that step 32 can calculation procedure 30 obtains, or the view data that step 30 obtains made several threshold values, according to these several threshold values view data is divided into several groups again, and gives the different weights of each group in the hope of its weighted mean value.Those skilled in the art will be understood that different eigenwerts can produce the effect that has both advantages and disadvantages, and substituting of these computing method all should be considered as within category of the present invention.
Generally speaking, shown through the support column shadow effect of step (a) and the adjusted light-emitting diode (LED) backlight module of step (b) and reduced.Below will illustrate according to another embodiment of the present invention, its further image data processing promote to eliminate the effect of shade.Present embodiment comprises three key steps, except step (a) and step (b) with the foregoing description is identical, still comprise image processing step (c) in addition, it adjusts the GTG value of all pixels according to the luminance contour of all pixels of a plurality of light emitting diode of support column surrounding institute coverage area.This image processing step (c) can be divided into three steps again, and its details is shown in Fig. 4.The flow process of Fig. 4 comprises the following step: step 40, set up the three-dimensional luminance profile (3D luminance profile) of support column surrounding pixel that light emitting diode is contained in all GTG values; Step 42, the three-dimensional luminance profile that produces according to step 40 calculates the reverse adjustment shielding matrix (inverse mask) of all GTG values corresponding to support column surrounding light emitting diode coverage area pixel; Step 44 acts on this reverse adjustment shielding matrix the pixel gray level value of support column surrounding light emitting diode coverage area.
The foundation of the so-called three-dimensional luminance profile of step 40 can utilize such as any image acquiring devices such as digital cameras to be carried out, and must set up under the support column surrounding light emitting diode is controlled in the condition of uniform luminance.Typical three-dimensional luminance profile can axially be represented light emitting diode coverage area locations of pixels coordinate by X-Y, and Z is the brightness value of represent pixel then axially.In addition, the mode of setting up all GTG value three-dimensional luminance profiles of support column surrounding light emitting diode coverage area pixel can have different variations.The most direct mode is that each GTG is all directly obtained its corresponding three-dimensional luminance profile.The GTG value of supposing the system is divided into 0 to 255, counts 256 rank, except GTG value 0 need not considered, can produce 255 three-dimensional luminance profiles.Perhaps, can produce high-high brightness GTG value earlier, for example 255, the three-dimensional luminance profile, ask for the three-dimensional luminance profile of other intensity gray scale value then with rule of three.Or, can also produce the three-dimensional luminance profile of several representative GTG values, then ask for the three-dimensional luminance profile of other intensity gray scale value with interpolation method.The GTG value of supposing the system is divided into 0 to 255, and then step 40 will produce 255 three-dimensional luminance profiles as mentioned above.
How Fig. 5 A demonstration asks for the described reverse adjustment shielding matrix of step 42.The original GTG value of herein only demonstrating is 255 situation, and other situation can the rest may be inferred.Fig. 5 A comprises original GTG matrix 50, obtains image gray-scale level matrix 52 and reverse adjustment shielding matrix 54.Matrix herein only comprises 25 interior pixels of regional area of 5 * 5.The number of pixel may be looked actual conditions difference to some extent, but relative reverse adjustment shielding matrix production method can be analogized according to the method for this explanation.Numeral in each matrix unit grid may be represented the GTG value or the GTG value related operation data of pixel on this position, decides on the character of each matrix.Because this example is the original GTG value of demonstration is 255 situation, so the pixel gray level value in the original GTG matrix 50 is 255.Obtain 52 in image gray-scale level matrix and comprise different pixel gray level values, it is equal to or is slightly less than 255, represents the actual gray value of backlight module support column surrounding Image Acquisition.The per unit grid of reverse adjustment shielding matrix 54 is respectively the poor of the pixel value that obtains in the image gray-scale level matrix 52 minimum pixel gray level value and per unit grid.By Fig. 5 A as can be known, in this example, obtaining pixel gray level value minimum in the image gray-scale level matrix 52 is 248.For example, obtain that to contain pixel value in the image gray-scale level matrix 52 be 248,251 and 255 unit grid, the value of its reverse adjustment shielding matrix 54 relative unit grids will be respectively 0 ,-3 (being 248-251) and-7 (being 248-255).
Step 44 is so-called to act on the pixel of support column surrounding light emitting diode coverage area with this reverse adjustment shielding matrix, is that original pixels intensity gray scale value with support column surrounding light emitting diode coverage area adds the adjusted value in the corresponding reverse adjustment shielding matrix.The pixel of support column surrounding light emitting diode coverage area has different adjusted values according to its position with the different of original brightness GTG value.Referring to Fig. 5 B, its original GTG value of demonstrating is that 255 image is through the result after the step 44.Fig. 5 B comprises original GTG matrix 50, reverse adjustment shielding matrix 54 and adjusts GTG matrix 56.By Fig. 5 B as can be known, adjusting GTG matrix 56 is to be added reverse adjustment shielding matrix 54 and produced by original GTG matrix 50.
Above embodiment only is that possible reality is made example.Many variations or modification all can be reached under the principle that does not break away from this announcement.These variations or revise all should be considered as within this announcement category and to be protected by appended claim scope.
Claims (18)
1. method of eliminating the backlight module support column shade of flat-panel screens comprises:
(a) provide the matrix form light-emitting diode (LED) backlight module, it has at least one support column and is positioned at this backlight module, and this support column is between adjacent a plurality of light emitting diodes; And
(b) according to the distribution of the pixel gray level value of this adjacent a plurality of light emitting diodes region obtaining the light-emitting diode luminance value, and light this adjacent a plurality of light emitting diodes simultaneously with this light-emitting diode luminance value.
2. according to the method for the backlight module support column shade of the described elimination flat-panel screens of claim 1, wherein this support column is positioned at the middle position of these adjacent a plurality of light emitting diodes.
3. according to the method for the backlight module support column shade of claim 1 or 2 described elimination flat-panel screens, wherein above-mentioned step (b) comprises the following step:
(b1) pixel gray level value of obtaining this adjacent a plurality of light emitting diodes region of this support column distributes;
(b2) calculate the eigenwert that this pixel gray level value distributes;
(b3) according to this eigenwert, to produce this light-emitting diode luminance value; And
(b4) light this adjacent a plurality of light emitting diodes simultaneously according to this light-emitting diode luminance value.
4. according to the method for the backlight module support column shade of the described elimination flat-panel screens of claim 3, wherein above-mentioned eigenwert is the mean value that this pixel gray level value distributes.
5. according to the method for the backlight module support column shade of the described elimination flat-panel screens of claim 4, wherein the light-emitting diode luminance value of above-mentioned steps (b3) is to obtain with following formula:
f
-1(L)
Wherein L is the mean value that this pixel gray level value distributes, f
-1Be the transfer function of pixel gray level value to the light-emitting diode luminance value.
6. according to the method for the backlight module support column shade of the described elimination flat-panel screens of claim 1, also comprise:
(c) according to the luminance contour of all pixels of this adjacent a plurality of light emitting diodes region, with the GTG value of all pixels of adjusting this adjacent a plurality of light emitting diodes region.
7. according to the method for the backlight module support column shade of the described elimination flat-panel screens of claim 6, wherein above-mentioned step (c) comprises the following step:
(c1) set up a plurality of three-dimensional luminance profiles of pixel that this adjacent a plurality of light emitting diode is contained in all GTG values, its X-Y is representative locations of pixels that this a plurality of light emitting diode is contained axially, and Z axially represents the brightness value of this pixel;
(c2) according to a plurality of reverse adjustment shielding matrix of these a plurality of three-dimensional luminance profiles generations with respect to all GTG values;
(c3) these a plurality of reverse adjustment shielding matrixs of basis are to adjust the pixel brightness value of this adjacent a plurality of light emitting diodes region.
8. according to the method for the backlight module support column shade of the described elimination flat-panel screens of claim 7, wherein the foundation of a plurality of three-dimensional luminance profiles of above-mentioned steps (c1) is the three-dimensional luminance profile that produces this area pixel maximum gray value earlier, draws the three-dimensional luminance profile of other GTG value again with rule of three.
9. according to the method for the backlight module support column shade of the described elimination flat-panel screens of claim 7, wherein the foundation of a plurality of three-dimensional luminance profiles of above-mentioned steps (c1) is the three-dimensional luminance profile that produces any a plurality of GTG values of this area pixel earlier, draws the three-dimensional luminance profile of other GTG value again with interpolation method.
10. flat-panel screens comprises:
The matrix form light-emitting diode (LED) backlight module, it has at least one support column and is positioned at this backlight module, and this support column is between adjacent a plurality of light emitting diodes; And
Backlight control apparatus, it obtaining the light-emitting diode luminance value, and lights this adjacent a plurality of light emitting diodes with this light-emitting diode luminance value according to the distribution of pixel gray level value of this adjacent a plurality of light emitting diodes region simultaneously.
11. flat-panel screens according to claim 10, wherein this support column is positioned at the middle position of these adjacent a plurality of light emitting diodes.
12. according to claim 10 or 11 described flat-panel screens, wherein above-mentioned backlight control apparatus is carried out the following step:
(b1) obtain the pixel gray level value of this adjacent a plurality of light emitting diodes region of this support column;
(b2) calculate the eigenwert that this pixel gray level value distributes;
(b3) according to this eigenwert, to produce this light-emitting diode luminance value; And
(b4) light this adjacent a plurality of light emitting diodes simultaneously according to this light-emitting diode luminance value.
13. flat-panel screens according to claim 12, wherein above-mentioned eigenwert are the mean value that this pixel gray level value distributes.
14. flat-panel screens according to claim 13, wherein the light-emitting diode luminance value of above-mentioned steps (b3) is to obtain with following formula:
f
-1(L)
Wherein L is the mean value that this pixel gray level value distributes, f
-1Be the transfer function of pixel gray level value to the light-emitting diode luminance value.
15. flat-panel screens according to claim 10 also comprises:
Image processing apparatus, it is according to the luminance contour of all pixels of this adjacent a plurality of light emitting diodes region, with the GTG value of all pixels of adjusting this adjacent a plurality of light emitting diodes region.
16. flat-panel screens according to claim 15, wherein above-mentioned image processing apparatus is carried out the following step:
(c1) set up a plurality of three-dimensional luminance profiles of pixel that this adjacent a plurality of light emitting diode is contained in all GTG values, its X-Y is representative locations of pixels that this a plurality of light emitting diode is contained axially, and Z axially represents the brightness value of this pixel;
(c2) according to a plurality of reverse adjustment shielding matrix of these a plurality of three-dimensional luminance profiles generations with respect to all GTG values;
(c3) these a plurality of reverse adjustment shielding matrixs of basis are to adjust the pixel brightness value of this adjacent a plurality of light emitting diodes region.
17. flat-panel screens according to claim 16, wherein the foundation of a plurality of three-dimensional luminance profiles of above-mentioned steps (c1) is the three-dimensional luminance profile that produces this area pixel maximum gray value earlier, draws the three-dimensional luminance profile of other GTG value again with rule of three.
18. flat-panel screens according to claim 17, wherein the foundation of a plurality of three-dimensional luminance profiles of above-mentioned steps (c1) is the three-dimensional luminance profile that produces any a plurality of GTG values of this area pixel earlier, draws the three-dimensional luminance profile of other GTG value again with interpolation method.
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| CNB2006100945196A CN100385299C (en) | 2006-06-09 | 2006-06-09 | Method for eliminating light-emitting diode backlight module support column surrounding shadow |
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| CNB2006100945196A CN100385299C (en) | 2006-06-09 | 2006-06-09 | Method for eliminating light-emitting diode backlight module support column surrounding shadow |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102661538A (en) * | 2012-04-16 | 2012-09-12 | 深圳市华星光电技术有限公司 | Direct type backlight module group and liquid crystal display device |
| CN103472624A (en) * | 2012-04-16 | 2013-12-25 | 深圳市华星光电技术有限公司 | Direct type backlight module and LCD (Liquid Crystal Display) device |
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| WO2019056493A1 (en) * | 2017-09-19 | 2019-03-28 | 惠科股份有限公司 | Touch-control display apparatus |
| WO2019056485A1 (en) * | 2017-09-19 | 2019-03-28 | 惠科股份有限公司 | Liquid crystal display apparatus |
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| CN100361486C (en) * | 2003-03-17 | 2008-01-09 | 宇东科技股份有限公司 | Image correcting method |
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| TWI282886B (en) * | 2004-04-01 | 2007-06-21 | Au Optronics Corp | Backlight module |
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| CN102661538A (en) * | 2012-04-16 | 2012-09-12 | 深圳市华星光电技术有限公司 | Direct type backlight module group and liquid crystal display device |
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| CN104267539A (en) * | 2012-07-23 | 2015-01-07 | 冠捷显示科技（厦门）有限公司 | LED (light-emitting diode) light mixing device |
| CN104267539B (en) * | 2012-07-23 | 2017-04-12 | 冠捷显示科技（厦门）有限公司 | LED (light-emitting diode) light mixing device |
| WO2019056493A1 (en) * | 2017-09-19 | 2019-03-28 | 惠科股份有限公司 | Touch-control display apparatus |
| WO2019056485A1 (en) * | 2017-09-19 | 2019-03-28 | 惠科股份有限公司 | Liquid crystal display apparatus |
| US10983644B2 (en) | 2017-09-19 | 2021-04-20 | HKC Corporation Limited | Touch display device |
| US11048126B2 (en) | 2017-09-19 | 2021-06-29 | HKC Corporation Limited | Flat panel display |
| US11256145B2 (en) | 2017-09-19 | 2022-02-22 | HKC Corporation Limited | Flat panel display |
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