CN101846264B - Backlight module and liquid crystal display device - Google Patents
Backlight module and liquid crystal display device Download PDFInfo
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- CN101846264B CN101846264B CN 200910080829 CN200910080829A CN101846264B CN 101846264 B CN101846264 B CN 101846264B CN 200910080829 CN200910080829 CN 200910080829 CN 200910080829 A CN200910080829 A CN 200910080829A CN 101846264 B CN101846264 B CN 101846264B
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Abstract
The invention relates to a backlight module and a liquid crystal display device. In the backlight module, a polarizing element is arranged on a propagation path of light rays with set color, emitted from a backlight source, between the backlight source and a light guide plate and used for the polarization adjustment of the light rays with colors set partially at least to be linearly polarized light with a set polarization direction. The liquid crystal display device comprises the backlight module, and an included angle larger than 0 degree is formed between the polarization direction of the adjusted light with set color and the polarization direction of a lower polaroid. By adopting a technical measure to carry out polarization filtering on the light rays with set color, the invention ensures that the brightness of the backlight sources under different gray levels is changed with varying degrees, thus the invention is beneficial to improving contrast and optimizing the display effect.
Description
Technical field
The present invention relates to display technique, relate in particular to a kind of module backlight and LCD.
Background technology
In the existing common transmission type lcd device, operated by rotary motion has module backlight to come to provide light source for LCD.Fig. 1 is the structural representation of a kind of LCD in the prior art, and module backlight is arranged on the rear of liquid crystal panel 20 usually, is embedded in the metal edge frame 30 with liquid crystal panel 20.As shown in Figure 1, module backlight comprises a light guide plate 11, towards a side of liquid crystal panel 20 multilayer optical rete 12 is set in light guide plate 11, and optical film 12 is followed successively by diffusion sheet, prismatic lens and following diffusion sheet typically; A side that deviates from liquid crystal panel 20 in light guide plate 11 is provided with reflected bottom plate 13; Be provided with backlight 14 and driving circuit thereof in the both sides of light guide plate 11, backlight 14 generally can be selected cold cathode fluorescent lamp pipe (the Cold Cathode Fluorescent Lamp that sends white natural light for use; Hereinafter to be referred as: CCFL) or for sending light emitting diode (the Light Emitting Diode of light of all kinds respectively; Hereinafter to be referred as: LED), the outside of backlight 14 is arranged with reflection side plate 15, and reflection side plate 15 and reflected bottom plate 13 can be referred to as reflecting plate.Upper polarizer 40 and following polaroid 50 shown in Figure 1 are attached on two surfaces of liquid crystal panel 20, and according to the displaying principle of LCD, upper polarizer 40 is vertical mutually with the polarization direction of 50 pairs of light of following polaroid usually.When light penetrates from backlight 14, enter light guide plate 11 through baffle reflection, enter optical film 12 through light guide plate 11 guidings, after the polarization of polaroid 50 filters down, enter liquid crystal panel 20 again, light behind liquid crystal deflecting element again through upper polarizer 40 outgoing, thereby show image.
Show contrast (Contrast Ratio; Hereinafter to be referred as: be one of important parameter of weighing the LCD display effect CR), how improving contrast is present people's question of common concern.In the research process that carries out the display contrast, the inventor finds: in LCD, module backlight is in the minimal gray level, and namely the emitting brightness when the L0 gray level is higher is one of key factor of influence demonstration contrast.With 256 gray levels, namely gray level is example for the display from L0 to L255, and the contrast computing formula of display is as follows: CR=maximum gray scale (L255) brightness/minimal gray level (L0) brightness.The ratio of brightness when contrast equals high grade grey level and minimal gray level, the high nature of brightness can reduce contrast during the minimal gray level, causes showing that contrast is in reduced levels, has influenced display effect.
Summary of the invention
The purpose of this invention is to provide a kind of module backlight and LCD, to improve the demonstration contrast of LCD, improve display effect.
For achieving the above object, the invention provides a kind of module backlight, comprise backlight and light guide plate, wherein: the path that the light of the setpoint color that described backlight sends is propagated is provided with polarizing component, described polarizing component is used for polarization and is adjusted to the light of the described setpoint color of small part for setting the linearly polarized light of polarization direction between described backlight and described light guide plate.
For achieving the above object, the present invention also provides a kind of the present invention of comprising the LCD of module backlight, also comprise upper polarizer, liquid crystal panel, following polaroid and metal edge frame, wherein: the light of setpoint color has an angle between the polarization direction of the setting polarization direction after the adjustment of described polarizing component polarization and described polaroid down, described angle is greater than 0 degree.
By above technical scheme as can be known, the present invention adopts the light to setpoint color to carry out the technological means that polarization is adjusted, and makes that the brightness of backlight has obtained change in various degree under the different grey-scale, therefore is conducive to improve contrast, optimizes display effect.
Description of drawings
Fig. 1 is the structural representation of a kind of LCD in the prior art;
Fig. 2 is the structural representation of the present invention module first embodiment backlight;
Fig. 3 is the optical schematic diagram among the present invention module first embodiment backlight;
Fig. 4 is the synoptic diagram of blue light light intensity under the minimal gray level in the existing module backlight;
Fig. 5 is the synoptic diagram of blue light light intensity under the minimal gray level among the present invention module first embodiment backlight;
Fig. 6 for the brightness ratio of maximum gray scale in the present invention module first embodiment backlight and the prior art than synoptic diagram;
Fig. 7 compares synoptic diagram for the contrast of maximum gray scale in the present invention module first embodiment backlight and the prior art;
Fig. 8 is the structural representation of the present invention module second embodiment backlight.
Among the figure:
11-light guide plate 12-optical film 13-reflected bottom plate
14-backlight 141-blue led 142-red LED
143-green LED 15-reflection side plate 20-liquid crystal panel
Polaroid under the 30-metal edge frame 40-upper polarizer 50-
60-polarizing component 70-beam splitter 80-mixed light element
Embodiment
In carrying out research process of the present invention, the inventor finds that versicolor light is to the contribution difference of overall brightness under the different grey-scale.
Based on above-mentioned discovery, the inventor has proposed module backlight of the present invention and LCD.Module backlight of the present invention comprises backlight and light guide plate, wherein, the path that the light of the setpoint color that backlight sends is propagated is provided with polarizing component, polarizing component is between backlight and light guide plate, and polarizing component is used for polarization and is adjusted to the light of small part setpoint color for setting the linearly polarized light of polarization direction.Technical scheme of the present invention adopts polarizing component to adjust the polarization characteristic of the light of a part of particular color, make the direction of vibration light parallel with the polarization direction of polarizing component pass through polarizing component, light after the polarization adjustment is to have the linearly polarized light of setting the polarization direction, can have an acute angle by polarization direction and this setting polarization direction of polaroid under arranging in the LCD, make the partial line polarized light can't pass through polaroid down, namely this setpoint color light Central Plains originally can be by polaroid under the light of polaroid can't pass through after adjusting down, the light intensity that goes out of this color light is weakened, in conjunction with these discoveries of contribution difference to brightness under different grey-scale of particular color light, the emitting brightness of backlight under the minimal gray level is reduced, thereby improve the contrast of display, improve display effect.
Specific implementation of the present invention has multiple, also by reference to the accompanying drawings the present invention is described in further detail below by specific embodiment.
Module first embodiment backlight
Fig. 2 is the structural representation of the present invention module first embodiment backlight.In the present embodiment, module backlight comprises backlight 14, light guide plate 11, reflecting plate and optical film 12.Present embodiment is that example describes with the structure that light guide plate 11 both sides arrange backlight 14 specifically, and the back light module unit structure that one-sided or downside arranges backlight 14 in light guide plate 11 similarly.Concrete, reflecting plate can comprise reflected bottom plate 13 and reflection side plate 15, optical film 12 can arrange as required, is typically to comprise diffusion sheet, prismatic lens and last diffusion sheet down.Module backlight can also comprise the plastic frame of fixing these functional parts.Wherein, the path that the light of the setpoint color that backlight 14 sends is propagated is provided with polarizing component 60, polarizing component 60 is between backlight 14 and light guide plate 11, and polarizing component 60 is to have the linearly polarized light of setting the polarization direction for the light that polarization is adjusted to this setpoint color of small part.In the present embodiment, selecting blue is to carry out the setpoint color that polarization is adjusted, and the polarization direction of 60 pairs of blue rays of polarizing component is adjusted.
In the present embodiment, above-mentioned backlight is specially the light source that sends blue ray, for example is a blue led 141, also comprises a plurality of light sources that send other color light in the module backlight, for example also comprises red LED 142 and green LED 143, constitutes led array.Module backlight in the present embodiment is the sidelight form, and led array all is arranged on the side of light guide plate 11.Polarizing component 60 is arranged on the path that blue ray propagates, and specifically can be arranged between blue led 141 and the light guide plate 11, and for avoiding influencing other color light, polarizing component 60 preferably contiguous blue led 141 arranges.
Further, polarizing component 60 can be a polarizing coating, can plate on the part surface that is located on the light guide plate 11, and polarizing coating is established in the part plating that for example is roughly blue ray incident in light guide plate 11 sides.Perhaps also the polarizing coating plating can be located on the part or all of surface of blue led 141, preferably only plating is located on the part surface, to guarantee that enough blue ray outgoing are finally arranged, avoids other display performances reductions such as colourity.The area size that polarizing component 60 is established in blue led 141 platings can change the ratio that blue ray is polarized adjustment.
Fig. 3 is the optical schematic diagram among the present invention module first embodiment backlight, the course of work of present embodiment module backlight is as follows: LED of all kinds sends red light R, blue ray B and green light G respectively, the blue ray B that blue led 141 sends need pass through polarizing component 60, as everyone knows, light can be decomposed into two parts light with vertical and horizontal polarization direction, then after the polarization of polarizing component 60 was adjusted, the orthogonal polarized light Bo of blue ray and horizontal polarization light Be only had part can pass through polarizing component 60; Finish in the space between led array and the light guide plate 11 through the blue ray after the polarizing component 60 polarization adjustment and other color light and to mix, generally have air dielectric in this space, the light that is conducive to different refractivity carries out the scattering mixing therein; Incide in the light guide plate 11 through mixed light, again through optical film 12 outgoing, perhaps also can set up mixed light element 80 respectively in the both sides of light guide plate 11 light incidents, a cavity for example, wherein be filled with can scattered beam medium, make the mixing of light more abundant, this cavity can be the through hole that is opened in light guide plate 11 sides; In the light of outgoing, the light identical with the polarization direction of following polaroid 50 enters liquid crystal panel 20 through the following polaroid 50 of LCD, after liquid crystal molecule reverses from upper polarizer 40 outgoing.For guaranteeing to have the part blue ray can be by polaroid 50 down, should make down the polarization direction of the polarization direction of polaroid 50 and polarizing component 60 roughly the same or have one greater than 0 angle of spending.Through the adjustment of above-mentioned polarizing component 60, part can will be filtered by the blue ray of following polaroid 50 originally, and then the light intensity that goes out of blue light reduces.
The LCD that adopts present embodiment module backlight is carried out experimental test, Fig. 4 is the synoptic diagram of blue light light intensity under the minimal gray level in the existing module backlight, Fig. 5 is the synoptic diagram of blue light light intensity under the minimal gray level among the present invention module first embodiment backlight, among Fig. 4 and Fig. 5, transverse axis is the wavelength value of light, and unit is nanometer (nm), and vertical pivot is the spectral radiance value, unit is candela (cd), and the wavelength of blue light light is approximately the 400-500 nanometer.Comparison diagram 4 and Fig. 5 are as can be known, the distribution of blue ray spectral radiance and size are different before regulating, when adopting present embodiment module backlight, the blue light light intensity that records under the L0 gray level has the first mate to reduce than prior art, first peak value of contrast blue spectrum radiation intensity, peak value is reduced to 0.03cd from 0.17cd.
Fig. 6 for the brightness ratio of maximum gray shade scale in the present invention module first embodiment backlight and the prior art than synoptic diagram, Fig. 7 is the contrast comparison synoptic diagram of maximum gray shade scale in the present invention module first embodiment backlight and the prior art.For the LCD overall display luminance, to compare with existing module backlight, the brightness size variation is little, can not influence the luminance index under the normal demonstration, but contrast is greatly improved.
The module backlight of present embodiment can be set the different polarization direction of polarizing component and adjust the polarization direction that has behind the blue ray polarization according to the requirement of actual contrast.When the polarizing coating that adopts plating to establish, only need to change plating and establish technological parameter and can adjust value partially, be simple and easy to realization.
Adopt the module backlight of present embodiment, by filtering out the part blue ray, the brightness of module backlight in the time of can reducing the minimal gray level is because blue ray is to the contribution difference of overall brightness under the different grey-scale, so the brightness influence of module backlight is little during to maximum gray scale.Therefore, according to the computing formula of contrast, the contrast of display can be improved, and display effect improves, and can obtain more excellent picture quality.
Module second embodiment backlight
Fig. 8 is the structural representation of the present invention module second embodiment backlight, and in the present embodiment, setpoint color be blue, and be with the difference of above-mentioned first embodiment: the backlight 14 in the present embodiment is the light source that sends white light, for example CCFL fluorescent tube; On the path that white light is propagated, also be provided with beam splitter 70, beam splitter 70 is between backlight 14 and polarizing component 60, be used for isolating from white light the light of setpoint color, the light of setpoint color carries out the polarization adjustment by polarizing component 60 more subsequently.
In concrete the application, beam splitter is not limited to be prism, can also be spectro-film, plating is located on the backlight or plating is located on the polarizing component, also can plate on other elements that are located in the module backlight, as long as guarantee the optical propagation path of beam splitter between backlight and polarizing component.
Breakage can also take place to prevent backlight as the supporting construction of backlight in the beam splitter in the present embodiment in impacting than big bang.
In the module backlight of present embodiment, also comprise mixed light element 80, mixed light element 80 is arranged on the side of light guide plate 11 light incidents, is used for mixing the light of other colors and the blue ray after the polarization adjustment.This mixed light element 80 is specifically as follows a cavity, wherein be filled with the medium for scattered beam, air for example, perhaps this mixed light element 80 can be conducive to the material that different refractivity light mixes for other, this mixed light element 80 can be for being opened in the through hole in light guide plate 11 sides, and optical schematic diagram can be referring to Fig. 3.
Technique scheme of the present invention, utilized blue ray to the bigger principle of minimal gray level brightness influence, therefore, by filtering out a part of blue ray, can obviously reduce the brightness of backlight under the minimal gray level, and to little than the influence of brightness under the high grade grey level, so the contrast of LCD can be improved, display effect can improve, for example, and when backlight CCFL current I
BDuring for the operate as normal value, I for example
B=7 MAHs, contrast can improve 30%.The method that the present invention improves contrast is simple, with low cost, is easy to apply.
LCD embodiment
LCD embodiment of the present invention can comprise the module backlight of the arbitrary embodiment of the present invention, and this LCD also comprises upper polarizer, liquid crystal panel, following polaroid and metal edge frame, wherein: the light of setpoint color has an angle between the polarization direction of the setting polarization direction after the adjustment of polarizing component polarization and following polaroid, be to have an angle between the polarization direction of the polarization direction of polarizing component and following polaroid, this angle is preferably greater than 0 degree.If polarizing component carries out the polarization adjustment to the light of whole setpoint colors, then this angle should be further less than 90 degree.By adjusting the corner dimension between the polarization direction on polarizing component and the following polaroid, can adjust setpoint color light, for example the ratio that is filtered of blue ray.The LCD of present embodiment has adopted module backlight of the present invention, can for example filter out the part blue ray by filtering out the light of part setpoint color, makes module backlight change different in the brightness of each gray level.Since blue ray go out light intensity to the brightness contribution maximum under the minimal gray level, so reduce the light intensity that of blue ray, can reduce the brightness under the minimal gray level, improve the contrast of LCD, improve display effect.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (5)
1. module backlight, comprise backlight and light guide plate, it is characterized in that: the path that the light of the setpoint color that described backlight sends is propagated is provided with polarizing component, described polarizing component is used for polarization and is adjusted to the light of the described setpoint color of small part for setting the linearly polarized light of polarization direction between described backlight and described light guide plate;
Described setpoint color is blue;
Described module backlight also comprises the mixed light element, and a side setting of the contiguous described light guide plate light incident of described mixed light element is used for mixing the light of other colors and the light of the described setpoint color after the polarization adjustment;
Described mixed light element is a cavity, wherein is filled with the medium for scattered beam;
The through hole of described mixed light element for offering at described light guide plate side;
Described backlight is the light source that sends white light;
Also be provided with beam splitter on the path that described white light is propagated, described beam splitter is used for isolating from described white light the light of described setpoint color between described backlight and described polarizing component;
Described beam splitter is a prism, and described prism is strip shape body, and the shape of cross section of described strip shape body is triangle;
Described backlight is the bar shaped fluorescent tube, is arranged on a side of described prism, and the tip of contiguous described prism arranges.
2. module backlight according to claim 1 is characterized in that:
The quantity of described prism is four, one group on per two prisms, and the adjacent minute surface that is in bottom is symmetrical arranged, and two groups of prisms are set up in parallel;
The quantity of described fluorescent tube is two, lays respectively between two prism tips arranged side by side.
3. module backlight according to claim 1, it is characterized in that: described polarizing component is polarizing coating, plating is located at the position that described beam splitter reflects described setpoint color light.
4. module backlight according to claim 1, it is characterized in that: described polarizing component is polarizing coating, plating is located on the part surface of light guide plate, or plating is located on the part or all of surface of the light source that sends described setpoint color light.
5. LCD that comprises the arbitrary described module backlight of claim 1～4, also comprise upper polarizer, liquid crystal panel, following polaroid and metal edge frame, it is characterized in that: the light of setpoint color has an angle between the polarization direction of the setting polarization direction after the adjustment of described polarizing component polarization and described polaroid down, described angle is greater than 0 degree.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910080829 CN101846264B (en) | 2009-03-23 | 2009-03-23 | Backlight module and liquid crystal display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910080829 CN101846264B (en) | 2009-03-23 | 2009-03-23 | Backlight module and liquid crystal display device |
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| CN101846264A CN101846264A (en) | 2010-09-29 |
| CN101846264B true CN101846264B (en) | 2013-10-02 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103343925B (en) * | 2013-07-19 | 2015-08-26 | 深圳市华星光电技术有限公司 | Display device and manufacture method thereof |
| CN105241887A (en) * | 2015-09-25 | 2016-01-13 | 黄梦漪 | Injection product butt fusion mark detector |
| CN106066554B (en) * | 2016-06-30 | 2020-04-24 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN107656400B (en) * | 2017-11-14 | 2020-09-04 | 海信视像科技股份有限公司 | Rubber frame, backlight module and liquid crystal display device |
| CN107991808A (en) * | 2017-12-22 | 2018-05-04 | 深圳市华星光电技术有限公司 | A kind of side entering type field sequence displayer and its backing structure |
| CN111077699A (en) * | 2019-12-19 | 2020-04-28 | Tcl华星光电技术有限公司 | Backlight module and display device |
| CN116184719A (en) * | 2023-03-06 | 2023-05-30 | 业成科技（成都）有限公司 | Local dimming device and driving method thereof |
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| CN1752826A (en) * | 2004-09-24 | 2006-03-29 | 株式会社日立显示器 | Liquid crystal display apparatus |
| CN101329458A (en) * | 2007-06-20 | 2008-12-24 | 青岛海信电器股份有限公司 | Method and device for adjusting liquid crystal display contrast |
| CN101377901A (en) * | 2007-08-31 | 2009-03-04 | 北京京东方光电科技有限公司 | Method for driving backlight source of liquid crystal display apparatus and backlight source |
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- 2009-03-23 CN CN 200910080829 patent/CN101846264B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1752826A (en) * | 2004-09-24 | 2006-03-29 | 株式会社日立显示器 | Liquid crystal display apparatus |
| CN101329458A (en) * | 2007-06-20 | 2008-12-24 | 青岛海信电器股份有限公司 | Method and device for adjusting liquid crystal display contrast |
| CN101377901A (en) * | 2007-08-31 | 2009-03-04 | 北京京东方光电科技有限公司 | Method for driving backlight source of liquid crystal display apparatus and backlight source |
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Owner name: JINGDONGFANG SCIENCE AND TECHNOLOGY GROUP CO., LTD Free format text: FORMER OWNER: BEIJING BOE PHOTOELECTRICITY SCIENCE + TECHNOLOGY CO., LTD. Effective date: 20150813 Owner name: BEIJING BOE PHOTOELECTRICITY SCIENCE + TECHNOLOGY Effective date: 20150813 |
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Effective date of registration: 20150813 Address after: 100015 Jiuxianqiao Road, Beijing, No. 10, No. Patentee after: BOE Technology Group Co., Ltd. Patentee after: Beijing BOE Photoelectricity Science & Technology Co., Ltd. Address before: 100176 Beijing economic and Technological Development Zone, West Central Road, No. 8 Patentee before: Beijing BOE Photoelectricity Science & Technology Co., Ltd. |
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