CN101109869A - Side-in and directly-down back light module unit - Google Patents
Side-in and directly-down back light module unit Download PDFInfo
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- CN101109869A CN101109869A CNA2007100298805A CN200710029880A CN101109869A CN 101109869 A CN101109869 A CN 101109869A CN A2007100298805 A CNA2007100298805 A CN A2007100298805A CN 200710029880 A CN200710029880 A CN 200710029880A CN 101109869 A CN101109869 A CN 101109869A
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Abstract
The invention relates to the technical field of backlight module, and discloses a side-in direct downward backlight module, which comprises a side-in light source, a side-in direct downward converter and a spreading board. The side-in light source is located at side end of the side-in direct downward converter, and the spreading board is located on the upper end of the side-in direct downward converter. As the light source is arranged at side, the module can be thinner; but after conversion, the light source is equal to a direct downward light source, which remains the advantages of the direct downward light source such as high brightness and evenness; the light utilization as a whole can be improved better without using any light-guiding board. In addition, the light source can be a semi-conductor laser, which is of high light efficiency and low heating, and can indirectly reduce the temperature rising. Additionally, a laser light source can be used, which has such advantages as the high light efficiency, the low energy consumption, the wide color domain and the polarization, etc.
Description
Technical field
The present invention relates to a kind of module backlight, specifically, relate to a kind of liquid crystal indicator module backlight.
Background technology
Advantage such as that liquid crystal indicator has is frivolous, little power consumption, radiation are low is widely used in electronic display units such as notebook computer, mobile phone, electronic dictionary, LCD TV, PDA.Because liquid crystal itself does not have the characteristics of luminescence, therefore need a module backlight could realize Presentation Function.
So-called backlight, the general reference light source that display screen relied on.Be usually used in light source backlight EL, CCFL, LED and laser and LIFI are arranged.
EL is backlight, i.e. electroluminescence is by the luminous and luminous cold light source of the intrinsic of fluorescent powder under alternating electric field excites.It is low, luminous gentle, evenly, can not produce ultraviolet ray to have ultra-thin, power consumption, visibility height in cigarette, mist environment are arranged, special excellent anti-water, antidetonation and the advantage of bending arbitrarily.Shortcoming is that brightness is low, the life-span short (being generally 3000～5000 hours), and need alternating electric field to drive, driving voltage is higher, also can be subjected to the interference of circuit and undesirable conditions such as flicker, noise occur.
CCFL is backlight, and advantage is the brightness height, so bigger black and white negative, blue mould negative and the colour LCD device of area all adopts it basically.In theory, it can make shades of colour according to the color theory of three primary colours.Its shortcoming is that power consumption is bigger, also need alternating current circuit to drive, and working temperature is narrower, is between 0～60 degree, and other backlight such as LED all can reach between-20～70.CCFL also can produce many unwanted spectrum outside its peak value spectrum in addition, cause that brightness worsens, and colour gamut is smaller, and colour rendering is relatively poor.
LED-backlit has long (100,000 hours), excitation height, color rendering rate height, brightness height of life-span, is not afraid of low temperature, advantages such as adaptability is strong, good reliability, no mercury pollution.But its luminescence efficiency not enough, still has much room for improvement.Heat radiation also is a problem to be broken through in addition, with existing ready-made heat dissipation technology, just have thermal source place temperature height, temperature problem of uneven distribution that peripheral temperature is low, if adopt heat pipe (LoopHeat Pipe) heat dissipation technology, heat conduction then can evenly distribute.But if be used in large scale TV, the LHP use amount also can be with the work multiplication, and price is too high then to be another right problem of demand side when the time comes.Except top 2, colour mixture also be LED as backlight than the difficult technologies obstacle, must do optics fine, just can reach comparatively satisfied effect.Because basically, the design of LED-backlit plate can not wish to use too many number, but if use less light source, breaking forth the brightness that comes again can be inhomogeneous, at this moment will come mixed light with optical technology, allow the light can Zhang Dekai, evenly be encompassed in bigger irradiated area, but also can reduce the utilization factor of light simultaneously.
Laser backlight, it has outside the advantages such as life-span, excitation of the LED that matches in excellence or beauty, also has the color reproducibility higher than LED, better light efficiency.But only be used for the rear-projection display technique at present.
LIFI is backlight, and the high-speed starting function suitable with LED arranged, the long-life the same with LED, the extensive degree of the colour gamut LED that matches in excellence or beauty.Be a kind of new light source, but, in heating, remain a big problem because consumption electric power just can obtain the relation of light quantity.
And when these backlights are used for the LCD demonstration, just have to consider backing structure.
At present, most popular backing structure has two kinds---side-light type, straight-down negative.
Because the module of straight-down negative is thicker, does not meet compact trend, therefore many at present based on side-light type, side-light type is about to linear or point source of light and is arranged on the backlight of making through the side of the light guide plate of particular design.According to the needs that reality is used, can make bilateral formula again, even three limit formulas.The side-light type characteristic that has light weight, slim, narrow frameization and low power consumption backlight, but the light utilization efficiency of light source is less, and thin more utilization factor is more little, and the most about 50%.Its technological core is the design and the making of light guide plate.
The effect of light guide plate is the scattering direction of direct light, is used for improving the brightness of panel, and guarantees the homogeneity of panel luminance, and the good excellent of light guide plate influences very big to backlight.Light guide plate is to utilize the method for ejection formation that propylene is pressed into ganoid plate, then with having the high reflection and the material of extinction not, mode in the bottom surface of light guide plate with screen painting stamps the diffusion point, light source is positioned at the thick end of light guide plate side, the light utilization reflection of being sent is toward thin end conduction, when light is mapped to the diffusion point, reflected light can be toward all angles diffusion, destroying conditioned reflex then penetrates by light guide plate is positive, utilize various densitys, diffusion point not of uniform size, can make the light guide plate uniformly light-emitting.In the light reflected back light guide plate that the purposes of reflecting plate is the bottom surface is exposed, be used for improving the service efficiency of light.Light guide plate can be divided into printing-type and non-printing-type again according to the technological process difference, and printing-type is the apparatus high reflectance and the material of extinction not on the acryl flat board, stamps circular or square diffusion point at bottom surface of light guide plate with screen painting.Non-printing-type then is to utilize precision die to make light guide plate when ejection formation, adds the graininess material of a small amount of different refractivity in propylene material, directly forms the microscopic bumps of gathering, and it acts on just like the site.Domestic manufacturers still adopt the light guide plate of printing-type as leaded light component mostly at present, it is low and produce advantage fast that the light guide plate of printing-type has cost of development, but not the technical difficulty of printing-type is higher, but performance is excellent in brightness, the mould development technology is the bottleneck place, in addition, can be divided into flat board and clapboard according to shape, flat board is applied to monitor more, and the wedge type plate is used for mobile computer more.As for the main application that diffuser plate reaches, be to improve positive brightness, the effect of diffuser plate is to allow the distribution of light more evenly make shadow that can't see reflection spot from the front.Right because after the ejaculation of light self-diffusion plate, the non-constant of the directive property of its light must utilize prismatic lens to revise direction of light, reaches the effect of optically focused, improve positive brightness.
Directly-down light source is a flat area source that a fixed structure is arranged, and can be a continuous uniform surface light source, as EL or plane fluorescent lamp; Also can be one and constitute, as a matrix LED or CCFL etc. by more pointolite.As back light, CCFL has that luminescence efficiency is low, poor, the heating of flash-over characteristic reaches and stablize long, the colour gamut that develops the color defect of insufficient of briliancy time under the sparking voltage high and low temperature; And that EL has is ultra-thin, low, the luminous soft advantage such as evenly of power consumption, but its driving voltage is too high, the life-span short, and unit area brightness is lower, shows so generally only be used for small size; And at present relatively more commonly used be the LED dot matrix, its advantage is a good brightness, good uniformity.Shortcoming is thickness big (greater than 4.0mm), and the LED quantity of use is more, and the heating phenomenon is obvious.
At present, be side entrance back as the backlight technology of main flow, but it also still exist many shortcomings.Main has:
1. the light source utilization factor is low, and the thin more utilization factor that will do will be low more.Obviously the deficiency of light efficiency has directly restricted this technology and has been used in development space on the larger sized display screen.
2. the microstructure of light guide plate is numerous, makes complicated.This has not only had influence on the utilization factor of light source, but also the problem that exists is exactly, the Optimization Model of light guide plate can't be general at different size, size changes a little, the microstructure parameters of light guide plate model also will just can reach similar optimization effect along with changing, be new size light guide plate of every production, just need a new model, a new mfg. moulding die.This just is unfavorable for the module production of industrialization.
3. homogeneity is not good, though the light guide plate model is more and more optimized, makes the area source of side entrance back become more and more even yet, because the limitation on the light path can't obtain an effect that approaches down straight aphototropism mode set all the time.
Summary of the invention
The objective of the invention is to overcome the deficiency of the technical existence of available liquid crystal backlight of display device module, the advantages of side-light type and down straight aphototropism mode set is got up, a kind of module thin thickness is provided, good brightness, the side of good uniformity is gone into down straight aphototropism mode set.
To achieve these goals, the present invention adopts following technical scheme:
A kind of side is gone into down straight aphototropism mode set, comprises that side entering optical source, side go into straight transformational structure and diffuser plate down, and side entering optical source is positioned at side and goes into the straight side of transformational structure down, and diffuser plate is positioned at side and goes into straight transformational structure down upper end.Light under transformational structure converted to directly under the light that the present invention goes into side was gone into directly by side is diffused as area source through diffuser plate.
Go in the down straight aphototropism mode set in above-mentioned side, when side entering optical source is LASER Light Source, be provided with light-mixing machine between the transformational structure under side entering optical source and side are gone into directly.Light-mixing machine will be mixed into one the tunnel to the laser of three looks, by the fiber optic conduction diffusion, reach the effect that increases the colour mixture uniformity coefficient again.
Go in the down straight aphototropism mode set in above-mentioned side, under side entering optical source is a non-laser light source, and side entering optical source and side are gone into directly, be provided with photo-coupler between the transformational structure.Photo-coupler is with light coupled into optical fibres to greatest extent.
Go in the down straight aphototropism mode set in above-mentioned side, transformational structure can be made up of the optical fiber of some under described side was gone into directly, also can be made up of the saturating anti-mirror of some.Described optical fiber can be lateral emitting optical fiber or light-conductive optic fibre.Described lateral emitting optical fiber is that optical fiber designs is become evenly bright dipping of side, and so, the light of coupled into optical fibres just can evenly be penetrated by the side of optical fiber, is gone into to transfer to down straight by side.Light-conductive optic fibre different in size, the light of coupled into optical fibres penetrates from the end of light-conductive optic fibre, is gone into to transfer to down straight by side.Saturating anti-mirror is meant energy reflecting part light and sees through the minute surface of residual ray, the light part reflection that side is gone into is converted to down straight, remaining light sees through the next saturating anti-mirror of minute surface directive, by transmitance and the reflectivity of adjusting anti-mirror, make from the light intensity unanimity of each saturating anti-mirror reflection, guaranteed the homogeneity of light.In order to strengthen, can between saturating anti-mirror and diffuser plate, diffusate be set, as lens or scattering minute surface or the like from the diversity of the light of saturating anti-mirror reflection.
Go in the down straight aphototropism mode set in above-mentioned side, described side entering optical source can be from monolateral incident or polygon incident.
Compared with prior art, the present invention has following beneficial effect: in order to meet the lightening day by day trend of module backlight, the scheme that the present invention still adopts the light source side to place, but do not use light guide plate to use optical fiber or saturating anti-mirror group instead as conductive medium, light source is transmitted to the distance (by the specific design decision) that needs, and changes its direction of propagation (past side is propagated to become toward display screen is positive and propagated), spread again, utilize the low-loss character of optical fiber, improve the utilization factor of luminous energy.The scheme of diffusion can spread light beam by curved mirror, also can directly use lateral emitting optical fiber, and side entering optical source is converted into line source under straight, is diffused as the better area source of homogeneity by diffuser plate at last.The diffusion way of this similar straight-down negative module, feasible module away from light source can provide enough strong light to spread by fiber optic conduction, is convenient to small size and scrabbles up large-sized modular combination, reduces the design difficulty of large-sized module.
The present invention is because light source is the side placement, and it is thinner that module can be done; But after conversion, be equivalent to the light source of straight-down negative again, kept the straight-down negative good brightness, the advantage of good uniformity; Light guide plate needn't be used, whole light utilization efficiency can better be improved.Light source can adopt semiconductor laser simultaneously, the light efficiency height, and thermal value is little, also reduces heating phenomenon problem indirectly; Can adopt LASER Light Source in addition, have the light efficiency height, advantages such as energy consumption is little, colour gamut is broad, polarization.
Description of drawings
Fig. 1 is that the side of embodiment 1 described non-laser light source is gone into down straight aphototropism mode set;
Fig. 2 is that the side of embodiment 2 described non-laser light sources is gone into down straight aphototropism mode set;
Fig. 3 is that the side of embodiment 3 described LASER Light Source is gone into down straight aphototropism mode set;
Fig. 4 is that the side of embodiment 4 described LASER Light Source is gone into down straight aphototropism mode set;
Fig. 5 is that the side of the bilateral incident of embodiment 5 described light sources is gone into down straight aphototropism mode set;
Fig. 6 is the synoptic diagram of putting of embodiment 6 described lateral emitting optical fibers.
Embodiment
As shown in Figure 1, a kind of side is gone into down straight aphototropism mode set, comprise lateral emitting optical fiber 32, diffuser plate 4, side entering optical source 1 and photo-coupler 2 thereof, side entering optical source 1 and photo-coupler 2 thereof are positioned at side and go into the straight side of transformational structure 3 down, and diffuser plate 4 is positioned at lateral emitting optical fiber 32 upper ends.
Side entering optical source 1 incident from the side utilizes photo-coupler 2 that light is coupled into lateral emitting optical fiber 32 to greatest extent, utilizes lateral emitting optical fiber 32 that light source is converted into the line source of straight-down negative, is diffused as area source by diffuser plate 4.The light emission rate of control lateral emitting optical fiber 32 sides goes out uniformity of light to guarantee the side.
As shown in Figure 2, change lateral emitting optical fiber 32 into light-conductive optic fibre 33, and between light-conductive optic fibre 33 and diffuser plate 4, lens 5 are set.Other are identical with embodiment 1.
Side entering optical source 1 incident from the side utilizes photo-coupler 2 that light is coupled into light-conductive optic fibre 33 to greatest extent, utilizes light-conductive optic fibre 33 that light source is converted into the line source of straight-down negative, after lens 5 diffusions, further is diffused as area source by diffuser plate 4 again.Control the light emission rate of every light-conductive optic fibre 32, to guarantee out uniformity of light.
As shown in Figure 3, a kind of side is gone into down straight aphototropism mode set, comprises anti-mirror 31, diffuser plate 4, LASER Light Source 1 and light-mixing machine 6 thereof, and LASER Light Source 1 and light-mixing machine 6 thereof are positioned at the side of anti-mirror 31, diffuser plate 4 is positioned at anti-mirror 31 upper ends, is provided with scattering minute surface 5 between diffuser plate 4 and the saturating anti-mirror 31.
LASER Light Source 1 incident from the side, utilize light-mixing machine 6 that the synthetic white bundle of LASER Light Source trailing flank is gone into to inject anti-mirror 31, the reflection of part light, the remaining next saturating anti-mirror 31 of saturating anti-mirror 31 directives that sees through, control the reflectivity and the transmitance of anti-mirror 31 well, guarantee the homogeneity of reflection ray, reflection ray is through the diffusion of scattering minute surface 5, and the further diffusion through diffuser plate 4 becomes uniform surface light source again.
As shown in Figure 4, a kind of side is gone into down straight aphototropism mode set, comprises lateral emitting optical fiber 32, diffuser plate 4, LASER Light Source 1 and light-mixing machine 6 thereof, and LASER Light Source 1 and light-mixing machine 6 thereof are positioned at the side of lateral emitting optical fiber 32, and diffuser plate 4 is positioned at lateral emitting optical fiber 32 upper ends.
LASER Light Source 1 incident from the side utilizes light-mixing machine 6 that the synthetic white bundle of LASER Light Source trailing flank is gone into to inject lateral emitting optical fiber 32, utilizes lateral emitting optical fiber 32 that light source is converted into the line source of straight-down negative, is diffused as area source by diffuser plate 4.The light emission rate of control lateral emitting optical fiber 32 sides goes out uniformity of light to guarantee the side.
Side entering optical source 1 of the present invention can adopt bilateral incident or polygon incident, as shown in Figure 5.
From embodiment 1 and embodiment 4, we utilize lateral emitting optical fiber as can be seen, are equivalent to the fluorescent tube in the direct-type backlight.So we can be according to the design needs, the trend of putting of lateral emitting optical fiber is optimized design and has reached better backlight and go out light effect.Can be spill, also can be the M type, even can be scroll, and as shown in Figure 6, concrete scheme is by design decision.
Embodiment 7
Can make a standard backlight module to backlight module of the present invention, when the manufacturing giant-screen is backlight, can combine this standard backlight module of polylith, be combined into the backlight of a giant-screen.
Claims (9)
1. a side is gone into down straight aphototropism mode set, it is characterized in that comprising that side entering optical source (1), side go into straight transformational structure (3) and diffuser plate (4) down, side entering optical source (1) is positioned at side and goes into the straight side of transformational structure (3) down, and diffuser plate (4) is positioned at side and goes into straight transformational structure (3) upper end down.
2. side as claimed in claim 1 is gone into down straight aphototropism mode set, it is characterized in that described side entering optical source (1) is LASER Light Source, is provided with light-mixing machine (6) between the transformational structure (3) under side entering optical source (1) and side are gone into directly.
3. side as claimed in claim 1 is gone into down straight aphototropism mode set, it is characterized in that described side entering optical source (1) is a non-laser light source, is provided with photo-coupler (2) between the transformational structure (3) under side entering optical source (1) and side are gone into directly.
4. side as claimed in claim 1 is gone into down straight aphototropism mode set, it is characterized in that described side goes into straight transformational structure (3) down and be made up of the optical fiber or the saturating anti-mirror (31) of some.
5. side as claimed in claim 4 is gone into down straight aphototropism mode set, it is characterized in that described optical fiber is lateral emitting optical fiber (32) or light-conductive optic fibre (33).
6. side as claimed in claim 5 is gone into down straight aphototropism mode set, it is characterized in that described lateral emitting optical fiber (32) is meant that the side can send the optical fiber of uniform light, and described anti-mirror (31) is meant can reflecting part light and see through the minute surface of residual ray.
7. side as claimed in claim 4 is gone into down straight aphototropism mode set, it is characterized in that also being provided with diffusate (5) between described anti-mirror (31) and the diffuser plate (4).
8. side as claimed in claim 7 is gone into down straight aphototropism mode set, it is characterized in that described diffusate (5) is lens or scattering minute surface.
9. side as claimed in claim 1 is gone into down straight aphototropism mode set, it is characterized in that described side entering optical source (1) is monolateral incident or polygon incident.
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| CNA2007100298805A CN101109869A (en) | 2007-08-24 | 2007-08-24 | Side-in and directly-down back light module unit |
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| CNA2007100298805A CN101109869A (en) | 2007-08-24 | 2007-08-24 | Side-in and directly-down back light module unit |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839407A (en) * | 2009-03-18 | 2010-09-22 | 索尼公司 | Fiber lamp, backlight and LCD |
| CN103047614A (en) * | 2013-01-22 | 2013-04-17 | 深圳市华星光电技术有限公司 | Light guide system, direct type backlight mould and liquid crystal display |
| CN103364864A (en) * | 2012-03-26 | 2013-10-23 | 联想(北京)有限公司 | Light-guide device and display equipment |
| CN103883928A (en) * | 2012-12-19 | 2014-06-25 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| CN104423092A (en) * | 2013-08-30 | 2015-03-18 | 鸿富锦精密工业（深圳）有限公司 | Straight down type backlight module and liquid crystal display device |
| CN105487293A (en) * | 2016-01-18 | 2016-04-13 | 京东方科技集团股份有限公司 | Liquid crystal display device and displayer |
| WO2016134553A1 (en) * | 2015-02-26 | 2016-09-01 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display device containing same |
| CN106526969A (en) * | 2016-12-27 | 2017-03-22 | 惠科股份有限公司 | Backlight module and display device using same |
| CN107430240A (en) * | 2015-03-16 | 2017-12-01 | 镭亚股份有限公司 | Using the backlight based on unidirectional grating in angular selectivity reflecting layer |
| CN107680505A (en) * | 2017-10-26 | 2018-02-09 | 厦门大学嘉庚学院 | Laser light source display device |
| CN108490624A (en) * | 2018-02-07 | 2018-09-04 | 华侨大学 | Lateral emitting optical fiber directional backlight bore hole 3D display screen |
| CN108895350A (en) * | 2018-08-09 | 2018-11-27 | 深圳市福尔乐照明有限公司 | A kind of ultra-thin LED lamps and lanterns |
| CN114077093A (en) * | 2020-08-13 | 2022-02-22 | 京东方科技集团股份有限公司 | Side-in light source, backlight module and display device |
| CN115240541A (en) * | 2021-04-23 | 2022-10-25 | 纬联电子科技(中山)有限公司 | Supporting backboard and thin direct type display thereof |
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2007
- 2007-08-24 CN CNA2007100298805A patent/CN101109869A/en active Pending
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839407A (en) * | 2009-03-18 | 2010-09-22 | 索尼公司 | Fiber lamp, backlight and LCD |
| CN103364864A (en) * | 2012-03-26 | 2013-10-23 | 联想(北京)有限公司 | Light-guide device and display equipment |
| CN103883928A (en) * | 2012-12-19 | 2014-06-25 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| CN103047614A (en) * | 2013-01-22 | 2013-04-17 | 深圳市华星光电技术有限公司 | Light guide system, direct type backlight mould and liquid crystal display |
| CN104423092A (en) * | 2013-08-30 | 2015-03-18 | 鸿富锦精密工业（深圳）有限公司 | Straight down type backlight module and liquid crystal display device |
| WO2016134553A1 (en) * | 2015-02-26 | 2016-09-01 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display device containing same |
| CN107430240B (en) * | 2015-03-16 | 2020-09-18 | 镭亚股份有限公司 | Unidirectional grating-based backlight employing an angularly selective reflective layer |
| CN107430240A (en) * | 2015-03-16 | 2017-12-01 | 镭亚股份有限公司 | Using the backlight based on unidirectional grating in angular selectivity reflecting layer |
| US10132987B2 (en) | 2016-01-18 | 2018-11-20 | Boe Technology Group Co., Ltd. | Backlight module, liquid crystal display device and display |
| CN105487293A (en) * | 2016-01-18 | 2016-04-13 | 京东方科技集团股份有限公司 | Liquid crystal display device and displayer |
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