CN201246632Y - Large area uniform luminance LED backlight device - Google Patents
Large area uniform luminance LED backlight device Download PDFInfo
- Publication number
- CN201246632Y CN201246632Y CNU2008200915087U CN200820091508U CN201246632Y CN 201246632 Y CN201246632 Y CN 201246632Y CN U2008200915087 U CNU2008200915087 U CN U2008200915087U CN 200820091508 U CN200820091508 U CN 200820091508U CN 201246632 Y CN201246632 Y CN 201246632Y
- Authority
- CN
- China
- Prior art keywords
- led
- circle spot
- light
- reflection
- led light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
A large area LED backlight device of uniform brightness resolves the technical problem that how a large-size LED backlight source utilizes as fewer LEDs as possible to obtain higher brightness and better light color uniformity. The technical scheme comprises that the backlight device comprises an outer casing and LED light sources, the inner surface of the wall of the outer casing is equipped with a reflecting film, the LED light sources are arranged at the bottom portion of the outer casing via an aluminum substrate, reflecting circular spot arrays combined by reflecting circular spots are sequentially arranged above the LED light sources, the reflecting circular spots are arranged on a light-passing board, a bottom portion mixed light space is formed by a diffusion film, a brightening film, the bottom portion of the outer casing and the reflecting circular spot arrays, an upper portion mixed light space is formed by the reflecting circular spot arrays and the diffusion film, the quantity of the reflecting circular spots is identical to that of the LED light sources, the diameter of each reflecting circular spot is larger than that of each LED light source, and the reflecting circular spots are arranged in the light-emitting direction of the normal line of the LED light sources. The utility model has the advantages of having high brightness and high light color distribution uniformity on the premise of not increasing the quantity of LEDs.
Description
Technical field
The utility model relates to a kind of large area LED back lighting device, particularly a kind of light source adopts large-power light-emitting diodes (LED), exiting surface has high brightness and high illuminance distribution and uniformity of chromaticity, is applicable to Backlight For Liquid Crystal Display Panels, also can be used as area source and be applied to the large tracts of land uniform luminance LED-backlit device that high-quality advertisement, art design etc. are used.
Background technology
LCD is becoming one of main flow of photoelectric display products such as flat panel TV, computer display screen, both desktop monitors, is subjected to the approval of mass consumption and likes.The graphic arts advertisement of high image quality combines with light source technology and brings high-quality visual enjoyment to people.These are all closely related with light source.Particularly for thin film transistor (TFT) array LCD (TFT-LCD), high-quality back light system (module backlight) has become the TFT-LCD important components and has more and more received engineers and technicians' concern.Because TFT-LCD belongs to passive light-emitting display device, must see through the backlight throw light, penetrate associated components such as Polarizer in the TFT-LCD panel, glass substrate, liquid crystal layer, colored filter, glass substrate, Polarizer in regular turn, enter people's eyes imaging at last, realize the function that shows.Therefore, the performance of module backlight directly has influence on the quality of TFT-LCD video picture.
The backlight of TFT-LCD display is based on cold-cathode fluorescence lamp (CCFL) at present.Although CCFL has advantage in price, brightness, there are shortcomings such as colour rendering is poor, mercurous, glassware, its application is restricted.Large-power light-emitting diodes (LED) since have the color rendition index height, energy-conservation, with environmental friendliness, characteristics such as sturdy and durable, make it become research and development focus in the LCD module backlight.The LED of middle low power is as back light, be mainly used in undersized portable LCD show product, as mobile phone, personal digital assistant etc.Great power LED is mainly used in large display device such as television set, does not obtain as yet at present to use widely.Chief reason is to exist technical bottleneck, as heat dissipation problem, light efficiency problem, large tracts of land photochromic homogeneity question, the particularly latter, goes back the good especially solution of neither one at present.Can improve brightness, strengthen uniformity though increase the number of LED,, certainly will increase the cost of module backlight owing to the cost height of great power LED.Secondly, because LED number increases, the outside electric current of supplying with increases, and the module caloric value sharply rises, and causes the temperature of system acutely to raise.Performance indications such as the effect of LED, life-span worsen with the rising of temperature, cause brightness decline, colourity drift.Consequently exiting surface brightness reduction, brightness and the uniformity of chromaticity variation of backlight.Cause the LCD display distortion, the appreciation effect variation.Therefore, the key issue in large scale LED-backlit source is how to utilize the least possible LED number to obtain higher brightness and better photochromic uniformity, and promptly the electrical power with minimum obtains maximum photochromic uniformity and the brightness that meets the demands.
Summary of the invention
How to utilize the least possible LED number to obtain higher brightness and better photochromic uniformity for solving large scale LED-backlit source, promptly obtain the technical problem of maximum photochromic uniformity and the brightness that meets the demands with the electrical power of minimum, the utility model provides a kind of large scale LED-backlit device, solves the technical deficiency that prior art exists.
The utility model realizes that the design philosophy that goal of the invention adopts is, utilize large power white light LED to design, above each LED, design a reflection spot, with near the bottom at the LED light reflected back LED place that (being 0 ° of angle light emission direction of LED) sends central axis direction as light source, employing direct-type backlight.Increase one deck reflectance coating in the bottom, the light that reflexes to the bottom is reflected away again.The benefit of doing like this, the one, strengthen light-emitting uniformity, the one, make full use of the light that each LED produces, thereby photochromic uniformity is effectively strengthened under the prerequisite that does not improve electrical power.
The utility model realizes that the concrete technical scheme that goal of the invention adopts is, a kind of large tracts of land uniform luminance LED-backlit device, comprise: shell and setting led light source in the enclosure, the shell wall inner surface of shell is provided with reflectance coating, led light source is arranged on the bottom of shell through aluminium base, above led light source, be disposed with the reflection circle spot array of forming by the reflection circle spot, the reflection circle spot is arranged on the light-passing board, diffusion barrier, brightness enhancement film, constitute the mixed light space between the bottom of shell and the reflection circle spot array, constitute the mixed light space between reflection circle spot array and the diffusion barrier, that quantity is set is identical for be provided with quantity and the led light source of reflection circle spot, and the diameter of reflection circle spot is greater than the led light source diameter, the reflection circle spot the light correspondence that send at the led light source normal position is set.
The beneficial effects of the utility model are to compare with having design now, under the prerequisite that does not increase LED quantity, have high brightness, high photochromic distributing homogeneity.
Description of drawings
Accompanying drawing 1 is the utility model structural representation.
Accompanying drawing 2 is a led light source array arrangement schematic diagram.
Accompanying drawing 3 is a reflection circle spot array distribution schematic diagram.
In the accompanying drawing, 1-1 shell, 1-2 reflectance coating, 1-3 aluminium base, 1-4LED light source, the 3-1 light transmission part, 3-2 reflection circle spot, mixed light space, 1-5 bottom, 1-6 brightness enhancement film, the 1-7 diffusion barrier, the reflection circle spot array that 1-8 reflection circle spot is formed, 1-9 light-passing board, mixed light space, 1-10 top.
The specific embodiment
Referring to accompanying drawing 1, a kind of large tracts of land uniform luminance LED-backlit device, the shell wall inner surface of shell 1-1 is provided with reflectance coating 1-2, led light source 1-4 is arranged on the bottom of shell 1-1 through aluminium base 1-3, above led light source 1-4, be disposed with the reflection circle spot array 1-8 that forms by reflection circle spot 3-2, reflection circle spot 3-2 is arranged on the light-passing board 1-9, diffusion barrier 1-7, brightness enhancement film 1-6, constitute mixed light space 1-5 between the bottom of shell 1-1 and the reflection circle spot array 1-8, constitute mixed light space 1-10 between reflection circle spot array 1-8 and the diffusion barrier 1-7, that quantity is set is identical for be provided with quantity and the led light source 1-4 of reflection circle spot 3-2, the diameter of reflection circle spot 3-2 is greater than led light source 1-4 diameter, and reflection circle spot 3-2 is provided with the light correspondence that send at led light source 1-4 normal the position.
This device realizes that the equally distributed principle of brightness is as follows: the light that led light source 1-4 sends is the strongest in normal direction, shines diffusion barrier 1-7 and goes up formation and the corresponding round spot array 1-8 of led light source 1-4, and the brightness irregularities that produces regular property distributes.Place reflection circle spot 3-2 in led light source 1-4 normal direction, the light of normal direction is reflexed to shell 1-1 bottom, reflect back into colour mixture space 1-5 through the bottom reflection film again.Through repeatedly reflection, light reaches abundant mixing like this, projects on the diffusion barrier 1-7, and process diffusion barrier 1-7's is extending transversely, forms uniform Luminance Distribution.Afterwards, the further colour mixture through the colour mixture space 1-10 between diffusion barrier 1-7 and the brightness enhancement film 1-6 realizes that better brightness evenly distributes.Penetrate from the front through brightness enhancement film at last, form all good planar light source of brightness and uniformity.Since this device will be strong excessively the direct light of normal direction change direction, it is penetrated from other directions, realize the light of the more weak exit direction of intensity is compensated.This device utilizes passive reflecting element to change the light distribution of led light source 1-4, makes full use of the light output of led light source 1-4, under the prerequisite that does not increase outside energize, realizes the even distribution of high brightness and brightness.
Among the utility model embodiment, described reflection circle spot 3-2 can be minute surface reflection or diffuse surface reflection circle spot.Described minute surface reflection circle spot 3-2 is for the vacuum coating reflection circle spot on light-passing board 1-9 or for sticking on the minute surface reflecting piece on the light-passing board 1-9.Reflection circle spot array 1-8 is set above led light source 1-4, reflection circle spot array 1-8 is the minute surface reflection-type, on glass light-passing board 1-9 plate, directly make the round spot array pattern that forms by the emission type material, as by technique for vacuum coating with al deposition on glass plate light-passing board 1-9, form the roundlet lens array.
According to above-mentioned principle, second kind of embodiment that the utility model provides is that its circle spot reflective array is the diffuse reflection type, adopts spraying coating process that diffuse-reflective material is painted on the glass light-passing board 1-9.The light that led light source 1-4 sends along normal direction, is exported by diffuser plate after the abundant colour mixture of colour mixture space 1-5 to the reflectance coating 1-2 of the bottom surface of shell 1-1 by diffuse reflection.
The minute surface reflection-type
Minute surface reflection-type reflection circle spot array 1-8, the basic structure of led light source 1-4 such as Fig. 1 are made up of shell 1-1, shell wall inner surface reflectance coating 1-2, LED aluminium base 1-3, led light source 1-4, mixed light space, bottom 1-5, output brightness enhancement film (1-6), diffusion barrier (1-7), reflection spot array 1-8, transparent panel 1-9, mixed light space, top 1-10 etc.Shell 1-1 aluminium sheet alloy helps heat radiation.Sidewall and base plate all have reflectance coating 1-2, and the light that will fall thereon reflexes to top mixed light space 1-5 and bottom blending space 1-10.Our experimental result shows that the reflectance coating 1-2 of inner wall surface can make the brightness of exiting surface improve more than 60%, what is more important, and reflectance coating 1-2 has changed the uniformity of exiting surface, especially the uniformity of marginal portion.The effect of LED aluminium base 1-3 is exactly to assist led light source 1-4 heat radiation, has the commercial goods can support utilization at present.Led light source is a core backlight, selects the high-power LED light source here for use, and its power bracket is from 0.5W to 3W.Usually select the led light source of 1W for use.Led light source forms good calorifics with aluminium base 1-3 and contacts, and the luminous heat of following of led light source 1-4 is emitted by aluminium base.This point is extremely important, if the luminous heating of following of light source 1-4 can not in time be discharged, the luminous efficacy of led light source will seriously be changed in quality.The existing at present commercial goods that LED is enclosed in aluminium base.The abundant mixing of light is realized in bottom and mixed light space, top, makes the light of any one direction all outstanding unlike the light of other directions.The big I in mixed light space is set as required, and our result shows that the space of 10-30mm scope is proper.In fact the output brightness enhancement film is exactly the output face of back lighting device, and its effect is the brightness that strengthens output light.Can directly adopt the commercial goods.The effect of diffusion barrier is to strengthen the extending transversely of light, strengthens the point spread function of light, makes light disperse therein, reaches the purpose of even light distribution.Most important light-passing board 1-9 is made up of reflection circle spot 3-2 and light transmission part 3-1 in the utility model.Reflection circle spot 3-2 is positioned at directly over the led light source 1-4, and the light that led light source 1-4 is sent along normal direction reflects back into bottom reflection film 1-2, and the peak Distribution of normal direction is become more smooth.The light of normal direction has so promptly improved the utilization rate of light through repeatedly demonstrating bigger randomness after the reflection on direction, has guaranteed uniformity of light again.For the round spot array 1-8 of minute surface reflection-type, several different methods can be arranged from physically realizing.Such as reflectance coating is made suitable dimensions, the rule of arranging by led light source 1-4 is bonded on the optical flat, also can adopt vacuum technology directly to form reflection-type circle spot on glass light-passing board 1-9.
The diffuse reflection type
The diffuse reflection type structure that the utility model provides and the structure basically identical of the minute surface reflection-type in the example one, difference are that the reflection circle spot array 1-8 here is the diffuse reflection type.With reference to figure 3, by selecting suitable material, utilize silk-screen technology, spraying technology can form diffuse reflection circle spot 3-2, form diffuse reflection type circle spot array 1-8, it is contained in correct position in the back lighting device, can reach the purpose of even output light.
Claims (4)
1, a kind of large tracts of land uniform luminance LED-backlit device comprises: shell and setting led light source in the enclosure is characterized in that; The shell wall inner surface of described shell (1-1) is provided with reflectance coating (1-2), led light source (1-4) is arranged on the bottom of shell (1-1) through aluminium base (1-3), be disposed with the reflection circle spot array of forming by reflection circle spot (3-2) (1-8) in the top of led light source (1-4), reflection circle spot (3-2) is arranged on the light-passing board (1-9), diffusion barrier (1-7), brightness enhancement film (1-6), constitute mixed light space (1-5), bottom between the bottom of shell (1-1) and the reflection circle spot array (1-8), constitute mixed light space, top (1-10) between reflection circle spot array (1-8) and the diffusion barrier (1-7), that quantity is set is identical for be provided with quantity and the led light source (1-4) of reflection circle spot (3-2), the diameter of reflection circle spot (3-2) is greater than led light source (1-4) diameter, reflection circle spot (3-2) the position is set in led light source (1-4) normal light direction correspondence.
2, a kind of large tracts of land uniform luminance LED-backlit device according to claim 1 is characterized in that: described reflection circle spot (3-2) is minute surface reflection or diffuse surface reflection circle spot.
3, a kind of large tracts of land uniform luminance LED-backlit device according to claim 2 is characterized in that: described minute surface reflection circle spot (3-2) is for the vacuum coating reflection circle spot on light-passing board (1-9) or for sticking on the minute surface reflecting piece on the light-passing board (1-9).
4, according to claim 2 or 3 described a kind of large tracts of land uniform luminance LED-backlit devices, it is characterized in that: described diffuse reflection circle spot (3-2) is serigraphy on light-passing board (1-9) or spraying diffuse reflection mating plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200915087U CN201246632Y (en) | 2008-01-08 | 2008-01-08 | Large area uniform luminance LED backlight device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200915087U CN201246632Y (en) | 2008-01-08 | 2008-01-08 | Large area uniform luminance LED backlight device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201246632Y true CN201246632Y (en) | 2009-05-27 |
Family
ID=40730454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200915087U Expired - Fee Related CN201246632Y (en) | 2008-01-08 | 2008-01-08 | Large area uniform luminance LED backlight device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201246632Y (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101782204A (en) * | 2010-04-21 | 2010-07-21 | 广东昭信光电科技有限公司 | LED backlighting structure provided with converted light source and using free-form surface reflector |
| WO2011000219A1 (en) * | 2009-07-01 | 2011-01-06 | 绎立锐光科技开发(深圳)有限公司 | Backlight source and thinning method for the same and liquid crystal device with the same |
| CN101958315A (en) * | 2009-07-13 | 2011-01-26 | 敦网光电股份有限公司 | Lighting device, display, and method for manufacturing the same |
| CN102650383A (en) * | 2011-02-24 | 2012-08-29 | 夏普株式会社 | Light source module and optical member |
| WO2013033885A1 (en) * | 2011-09-05 | 2013-03-14 | Lu Hsingliang | Planar light |
| CN103939756A (en) * | 2013-01-22 | 2014-07-23 | 东莞万士达液晶显示器有限公司 | Area light source device |
| CN105301841A (en) * | 2015-11-23 | 2016-02-03 | 青岛海信电器股份有限公司 | Backlight module and liquid crystal display equipment |
| CN106501994A (en) * | 2015-09-08 | 2017-03-15 | 青岛海信电器股份有限公司 | A kind of quantum dot light emitting device, backlight module and display device |
| CN110456558A (en) * | 2018-05-08 | 2019-11-15 | 京东方科技集团股份有限公司 | Optical film material, backlight and display device |
| CN113589588A (en) * | 2021-07-20 | 2021-11-02 | 武汉华星光电技术有限公司 | Backlight module and display module |
| CN116913181A (en) * | 2023-09-06 | 2023-10-20 | 山西麦信易科技有限公司 | Micro-assembly LED display and assembly method |
-
2008
- 2008-01-08 CN CNU2008200915087U patent/CN201246632Y/en not_active Expired - Fee Related
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011000219A1 (en) * | 2009-07-01 | 2011-01-06 | 绎立锐光科技开发(深圳)有限公司 | Backlight source and thinning method for the same and liquid crystal device with the same |
| US8810749B2 (en) | 2009-07-01 | 2014-08-19 | Appotronics Ltd. | Backlight sources having reduced thickness and liquid crystal display device using the same |
| CN101958315B (en) * | 2009-07-13 | 2013-05-01 | 敦网光电股份有限公司 | Lighting device, display, and method for manufacturing the same |
| CN101958315A (en) * | 2009-07-13 | 2011-01-26 | 敦网光电股份有限公司 | Lighting device, display, and method for manufacturing the same |
| US8110839B2 (en) | 2009-07-13 | 2012-02-07 | Luxingtek, Ltd. | Lighting device, display, and method for manufacturing the same |
| CN101782204A (en) * | 2010-04-21 | 2010-07-21 | 广东昭信光电科技有限公司 | LED backlighting structure provided with converted light source and using free-form surface reflector |
| CN102650383A (en) * | 2011-02-24 | 2012-08-29 | 夏普株式会社 | Light source module and optical member |
| WO2013033885A1 (en) * | 2011-09-05 | 2013-03-14 | Lu Hsingliang | Planar light |
| CN103939756A (en) * | 2013-01-22 | 2014-07-23 | 东莞万士达液晶显示器有限公司 | Area light source device |
| CN106501994A (en) * | 2015-09-08 | 2017-03-15 | 青岛海信电器股份有限公司 | A kind of quantum dot light emitting device, backlight module and display device |
| CN105301841A (en) * | 2015-11-23 | 2016-02-03 | 青岛海信电器股份有限公司 | Backlight module and liquid crystal display equipment |
| CN110456558A (en) * | 2018-05-08 | 2019-11-15 | 京东方科技集团股份有限公司 | Optical film material, backlight and display device |
| CN110456558B (en) * | 2018-05-08 | 2022-08-19 | 京东方科技集团股份有限公司 | Optical film material, backlight source and display device |
| CN113589588A (en) * | 2021-07-20 | 2021-11-02 | 武汉华星光电技术有限公司 | Backlight module and display module |
| CN113589588B (en) * | 2021-07-20 | 2023-12-01 | 武汉华星光电技术有限公司 | Backlight module and display module |
| CN116913181A (en) * | 2023-09-06 | 2023-10-20 | 山西麦信易科技有限公司 | Micro-assembly LED display and assembly method |
| CN116913181B (en) * | 2023-09-06 | 2023-12-01 | 山西麦信易科技有限公司 | Micro-assembly LED display and assembly method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201246632Y (en) | Large area uniform luminance LED backlight device | |
| KR101167301B1 (en) | Back light unit of liquid crystal display device | |
| TWI362533B (en) | Edge-type backlight unit | |
| CN102661535B (en) | Direct type backlight module | |
| CN101324725B (en) | LCD device and backlight device | |
| CN101852375B (en) | Back light module and liquid crystal display device thereof | |
| JP2005310611A (en) | Backlight device and display | |
| CN101688649B (en) | Lighting apparatus, display unit, and television receiver | |
| US8203665B2 (en) | Blacklight unit, liquid crystal display device having the same, and method for providing substantially white light for liquid crystal display device | |
| TWM466278U (en) | Thinning LED direct-type backlight module | |
| CN100454590C (en) | LED, LED module set and backlight system | |
| CN101046576A (en) | New LED back light module | |
| CN101688648B (en) | Lighting apparatus, display unit, and television receiver | |
| CN101555997A (en) | Led light source device | |
| CN214751236U (en) | Display device | |
| KR100811531B1 (en) | Back light unit and liquid crystal display having a diffusing plate | |
| KR20070109555A (en) | Diffusing plate, back light unit and liquid crystal display having the same | |
| WO2019205476A1 (en) | Light source module, backlight module, and liquid crystal display device | |
| CN100591978C (en) | Back light module structure and its display device | |
| CN103576385A (en) | Backlight module and display device | |
| KR20040083891A (en) | Direct type backlight module with very thin thickness and the systems thereof | |
| US11402690B2 (en) | Backlight unit and liquid crystal display device including the same | |
| CN102980101A (en) | Backlight module and display device utilizing same | |
| KR20070108712A (en) | Back light unit | |
| Chen | LEDs for liquid crystal display (LCD) backlighting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090527 Termination date: 20100208 |