CN105301839A - Method for relieving dark band shadow phenomenon between light bars of DLED backlight liquid crystal television - Google Patents
Method for relieving dark band shadow phenomenon between light bars of DLED backlight liquid crystal television Download PDFInfo
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- CN105301839A CN105301839A CN201510772836.8A CN201510772836A CN105301839A CN 105301839 A CN105301839 A CN 105301839A CN 201510772836 A CN201510772836 A CN 201510772836A CN 105301839 A CN105301839 A CN 105301839A
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- bar
- liquid crystal
- light
- backlight liquid
- light bars
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000011324 bead Substances 0.000 claims abstract description 13
- 239000011049 pearl Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000005142 aphototropism Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
The invention provides a method for relieving the dark band shadow phenomenon between light bars of a DLED backlight liquid crystal television. Convex reflecting material bands are additionally arranged between the parallel LED light bars, light outside emission angles of LED lamp beads of the parallel light bars is reflected to the dark band shadow region (a-b) of the interval central zone of the parallel light bars, and therefore the brightness of the region is improved. Through the design of the additionally-arranged convex light-reflecting strips, the appearance structure of a reflecting diaphragm in a backlight cavity of the direct type LED backlight liquid crystal television is optimized, and the dark band shadow phenomenon between light bars in existing screen pictures is relieved.
Description
One, technical field
The present invention relates to lcd technology, especially to the method that direct-light type LED backlight LCD TV backlight is optimized.
Two, background technology
Current, adopt the televisor of lcd technology or display to occupy the leading position of flat panel display product.LCD Panel belongs between passive light emission period, needs to rely on backlight ability display image content.The presentation mode of LCD backlight is divided into straight-down negative and side entering type two kinds.Because LED exists the advantage of the aspect such as energy-saving and environmental protection, life-span length, present liquid crystal display product has all used LED as backlight.Straight-down negative and side entering type two kinds of LED-backlit modes are compared, except on screen thickness straight-down negative thinner not as side entering type except, straight-down negative has that the cost of material is low and the advantage of rapid heat dissipation.Therefore, use direct-light type LED backlight is the development trend in liquid crystal display product future.
Direct-light type LED backlight assembly displaying principle as shown in Figure 1.In downward back photo structure, LED light source is positioned at the bottom of backlight cavity, upwards bright dipping together with the reflex of reflector plate, mixed light is carried out again through certain space distance, bright dipping after finally being modulated by blooming pieces such as diffuser plates, therefore the thickness of each optical module and the space light mixing distance needed for LED determine the integral thickness of backlight cavity.Usually this cavity is thicker, and the optical uniformity of backlight just can be done better.In other words, under the prerequisite that this cavity thickness (i.e. light mixing distance) numerical value is fixing, after reducing the quantity of LED lamp bead, LED lamp bead spacing can strengthen, and the homogeneity of this backlight light will be deteriorated.
As shown in Figure 2, straight-down negative LED lamp bead spacing is divided into horizontal direction W and vertical direction H.Present display screen width type is all generally 16:9, and the LED lamp bead quantity of horizontal direction is more than vertical direction.So in most cases, H > W, the lamp pearl spacing namely between two lamp bars is greater than the spacing of lamp pearl on every root lamp bar.Therefore, between two lamp bars, blanking bar shade phenomenon is more easily produced.The present invention is based on this problem to propose a solution.
Three, summary of the invention
The present invention seeks to, a kind of method improving blanking bar shade phenomenon between DLED backlight liquid crystal Light for watching TV bar is proposed, a kind of method for designing is especially proposed, the profile framework of direct-light type LED backlight LCD TV backlight inside cavity reflection diaphragm is optimized, improve the blanking bar shade phenomenon between the lamp bar that exists in current screen-picture, and under the prerequisite not increasing LED lamp bead quantity.
Technical scheme of the present invention is, improve the method for blanking bar shade phenomenon between DLED backlight liquid crystal Light for watching TV bar, the reflecting material material strip of protrusion is increased between parallel lamp bar, by the blanking bar shadow region (a-b) of the light reflection outside parallel lamp bar LED lamp bead emission angle to parallel lamp bar interval central area, to increase the brightness in this region.
The longitudinal section of the reflecting material material strip protruded is mountain peak shape or isosceles triangle, and mountain peak shape refers to acerous triangular profile shape angle, and the height h changing mountain peak shape or isosceles triangle reflecting surface adjusts the brightness in blanking bar shadow region (a-b).The base angle angle [alpha] simultaneously changing mountain peak shape or isosceles triangle reflecting surface also adjusts the brightness of blanking bar shadow region (a-b).
This brightness can not cross bright can not be excessively dark, require the brightness in other region around fundamental sum quite.The reflecting material material strip height h protruded is set to the 30-40% of film group housing depth or width (i.e. light mixing distance).
Solve in direct-light type LED backlight LCD TV or display and produce blanking bar shadow problem between lamp bar, first will analyze the reason producing blanking bar shade phenomenon.Briefly, LED lamp bead light source carries out radiation to surrounding at a certain angle, as shown in Figure 4.When enough hour of the spacing of two LED lamp pearls, their region projected respectively on screen has overlap (a-b), now, does not have shade, as shown in accompanying drawing 3 (a) between this two LED lamp pearl; When the spacing of two LED lamp pearls exceedes certain limit, they do not have overlap (a-b) in the region projected respectively on screen, now, just have shade and exist, as shown in accompanying drawing 3 (b) between this two LED lamp pearl.
We regard two LED lamp pearls in accompanying drawing 4 as two LED lamp bar, so, when the spacing of two LED lamp bar exceedes certain limit, just there will be blanking bar shade phenomenon between lamp bar.
The spacing shortening lamp bar can eliminate blanking bar shade, but can increase LED lamp bead quantity, and cost of products can be caused to rise, and the method does not meet market product competition trend.
Aforementioned LED light source carries out radiation to surrounding at a certain angle, and this angle is called as emission angle.In backlight industry, the angle of light intensity attenuation one half is defined as emission angle by us.In fact, the direction exceeding emission angle still has certain light intensity, as shown in Figure 5.The present invention utilizes the effect of the secondary reflection of this reflecting surface, and part is exceeded the light reflection of emission angle to shadow region (a-b).
Beneficial effect: the reflecting strips design of the protrusion that the present invention increases, that the profile framework of direct-light type LED backlight LCD TV backlight inside cavity reflection diaphragm is optimized, improve the blanking bar shade phenomenon between the lamp bar that exists in current screen-picture, improve picture brightness uniformity, to reach satisfied image effect.And not increasing LED lamp bead quantity, cost is without increase.Can suitably add headlight stripe pitch by the inventive method, namely reduce the lamp bar quantity in down straight aphototropism mode set, under the prerequisite ensureing image quality, even can reduce product design costs.
Four, accompanying drawing explanation
Fig. 1: direct-light type LED backlight assembly displaying principle schematic diagram;
Fig. 2: straight-down negative LED lamp bead spacing schematic diagram;
Fig. 3: LED mixed light principle schematic; The larger θ Fig. 3 of Fig. 3 (a) θ angle, (b) angle is less;
Fig. 4: light is secondary reflection principle schematic between lamp bar;
Fig. 5: light is secondary reflection principle schematic between lamp bar;
Fig. 6: reflectance coating framework (a) and Showing Effectiveness On Screen figure (b) that do not use the inventive method;
Fig. 7: use reflectance coating framework (a) after the inventive method and Showing Effectiveness On Screen figure (b).
Five, embodiment
As shown in Figure 1, liquid crystal panel 1, blooming piece 2, diffuser plate 3, reflectance coating 4, LED lamp bead 5, backlight assembly shell 6; In Fig. 4,5, the high h of lumbar triangle shape or mountain peak shape; I
0i
θit is the light distribution with θ angle reflection.
(can be a kind of paper material at two lamp bar centre reflectance coatings, reflector layer is prepared on surface) be folded into the reflecting surface that longitudinal section is isosceles triangle or mountain peak shape, utilize the effect of the secondary reflection of this reflecting surface, part is exceeded the light reflection of emission angle to shadow region (a-b).Change the brightness that the height h of this isosceles triangle reflecting surface and angle [alpha] can adjust shadow region (a-b).This brightness can not cross bright can not be excessively dark, require the brightness in other region around fundamental sum quite.With regard to isosceles triangle, angle [alpha] is the base angle of isosceles triangle, and α gets 15-75 °.Relatively more conventional 25-55 °.
Consider that the material of reflection diaphragm is made of paper, partially soft, be easily out of shape after the excessive height of reflecting surface.So generally isosceles triangle reflecting surface height h can be set to about 1/3 of film group housing depth or width (i.e. light mixing distance), if light mixing distance is 35mm, h can be set to 12mm.After determining reflecting surface height h, then adjust the angle [alpha] of reflecting surface, until reach promising result.
Increase reflecting surface can be original with backlight inside cavity reflection diaphragm share a material, produced by the mode cut and fold.
With certain DLED backlight liquid crystal TV, its light mixing distance is the 32 inch products of 35mm is example, and when employing 2 × 8 lamp bar scheme, namely backlight module adopts two lamp bars, every root lamp bar 8 lamp pearls.As shown in Figure 6, if do not use the inventive method, in the middle of screen, have a horizontal blanking bar; As shown in Figure 7, after using the inventive method, increase reflection measure in the middle of two lamp bars after, middle blanking bar disappears, and screen overall brightness is even.
Can suitably add headlight stripe pitch by the inventive method, namely reduce the lamp bar quantity in down straight aphototropism mode set, under the prerequisite ensureing image quality, reduce product design costs.Original 3 × 8 lamp bar schemes are upgraded to the successful case of 2 × 8 lamp bar schemes by the present embodiment exactly.The inventive method has good economic benefit.
Claims (5)
1. improve the method for blanking bar shade phenomenon between DLED backlight liquid crystal Light for watching TV bar, it is characterized in that the reflecting material material strip increasing protrusion between parallel LED lamp bar, by the blanking bar shadow region (a-b) of the light reflection outside parallel lamp bar LED lamp bead emission angle to parallel lamp bar interval central area, to increase the brightness in this region.
2. the method improving blanking bar shade phenomenon between DLED backlight liquid crystal Light for watching TV bar according to claim 1, is characterized in that the longitudinal section of the reflecting material material strip protruded is mountain peak shape or isosceles triangle.
3. the method improving blanking bar shade phenomenon between DLED backlight liquid crystal Light for watching TV bar according to claim 1, the height h that it is characterized in that changing mountain peak shape or isosceles triangle reflecting surface adjusts the brightness in blanking bar shadow region (a-b).
4. the method improving blanking bar shade phenomenon between DLED backlight liquid crystal Light for watching TV bar according to claim 1, the base angle angle [alpha] that it is characterized in that simultaneously changing mountain peak shape or isosceles triangle reflecting surface also adjusts the brightness of blanking bar shadow region (a-b).
5., according to the method for blanking bar shade phenomenon between the improvement DLED backlight liquid crystal Light for watching TV bar one of Claims 1-4 Suo Shu, it is characterized in that isosceles triangle height h is set to the 30-40% of film group housing depth and light mixing distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510772836.8A CN105301839A (en) | 2015-11-12 | 2015-11-12 | Method for relieving dark band shadow phenomenon between light bars of DLED backlight liquid crystal television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510772836.8A CN105301839A (en) | 2015-11-12 | 2015-11-12 | Method for relieving dark band shadow phenomenon between light bars of DLED backlight liquid crystal television |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105301839A true CN105301839A (en) | 2016-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510772836.8A Pending CN105301839A (en) | 2015-11-12 | 2015-11-12 | Method for relieving dark band shadow phenomenon between light bars of DLED backlight liquid crystal television |
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| CN (1) | CN105301839A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020103188A1 (en) * | 2018-11-22 | 2020-05-28 | 惠科股份有限公司 | Backlight module and display device |
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|---|---|---|---|---|
| CN101046578A (en) * | 2006-03-27 | 2007-10-03 | Lg.菲利浦Lcd株式会社 | Light emitting diode backlight unit and liquid crystal display having the same |
| CN102047174A (en) * | 2008-05-27 | 2011-05-04 | Lg电子株式会社 | LED back-light unit and liquid crystal display device using the same |
| 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 |
| CN102759821A (en) * | 2011-04-26 | 2012-10-31 | 松下液晶显示器株式会社 | Liquid crystal display device |
| CN202813222U (en) * | 2012-09-04 | 2013-03-20 | 苏州胜利精密制造科技股份有限公司 | Novel reflector plate structure and backlight module thereof |
| CN203585973U (en) * | 2013-12-03 | 2014-05-07 | 江苏设计谷科技有限公司 | Direct type television reflector plate structure |
-
2015
- 2015-11-12 CN CN201510772836.8A patent/CN105301839A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101046578A (en) * | 2006-03-27 | 2007-10-03 | Lg.菲利浦Lcd株式会社 | Light emitting diode backlight unit and liquid crystal display having the same |
| CN102047174A (en) * | 2008-05-27 | 2011-05-04 | Lg电子株式会社 | LED back-light unit and liquid crystal display device using the same |
| CN102759821A (en) * | 2011-04-26 | 2012-10-31 | 松下液晶显示器株式会社 | Liquid crystal display device |
| 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 |
| CN202813222U (en) * | 2012-09-04 | 2013-03-20 | 苏州胜利精密制造科技股份有限公司 | Novel reflector plate structure and backlight module thereof |
| CN203585973U (en) * | 2013-12-03 | 2014-05-07 | 江苏设计谷科技有限公司 | Direct type television reflector plate structure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020103188A1 (en) * | 2018-11-22 | 2020-05-28 | 惠科股份有限公司 | Backlight module and display device |
| US11378842B2 (en) | 2018-11-22 | 2022-07-05 | HKC Corporation Limited | Backlight module and display device |
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Application publication date: 20160203 |
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