CN1932607A - LED back light module with nonplanar reflector array - Google Patents
LED back light module with nonplanar reflector array Download PDFInfo
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- CN1932607A CN1932607A CN 200510102674 CN200510102674A CN1932607A CN 1932607 A CN1932607 A CN 1932607A CN 200510102674 CN200510102674 CN 200510102674 CN 200510102674 A CN200510102674 A CN 200510102674A CN 1932607 A CN1932607 A CN 1932607A
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Abstract
This LED Back Light Unit includes a LED array, a shell, a not plane reflector array, a light scattering and refraction structure. The shell's side wall and the base plate's inwall are reflecting layer, the LED array is on the shell's base plate. The not plane reflector array is located on the top of the LED array. The light scattering and refraction structure is made by many diffusion barriers and the prism barriers. The light emit from the LED's top or near it disperses through the not plane reflector's reflecting, this avoid the LED lamp shadow facula that appears on the module light out plane. Because the adoptive reflector array is completely detached from the LED array on the structure, this invention's manufacture is simple, and the cost is low, and it can be used on all kinds of LED illuminants and all kinds of LED arrays' arranges. It is fit for improving the industry's competition.
Description
Technical field
The present invention is about a kind of LED (Light Emitting Diode) backlight module, particularly about a kind of LED-backlit module that has nonplanar reflector array.
Background technology
At present, LCD (LCD) has become the main flow in flat pannel display field.Because liquid crystal itself is not luminous, so LCD need realize that transmission or reflection show by external light source.Existing LCD great majority are transmission-types, and for these transmission-types LCD, backlight is indispensable ingredient.
With respect to traditional cold cathode fluorescent lamp (CCFL), with LED be that the backlight module of light source has that color reducibility is good, advantage such as power saving, good environmental adaptability, pollution are little.Adopt the LCD of LED-backlit can show chromatic colour more, its color rendition scope can reach more than 105% of NTSC, be higher than far away CCFL backlight 75%.As the light source of full curing, LED has very strong environmental suitability.What is more important, CCFL contains the mercury metal that environment is had significant damage, and then there is not the problem of this respect in LED.Though at present the price of LED-backlit is than the CCFL height, and according to rule in the industry, per 10 years prices of LED descend about 10 times and performance improves about 30 times.Can predict, about 2008, LED will replace CCFL gradually and become the backlight source of main flow.
The most general in the market LED as shown in Figure 1.This class LED is a top light emitting, and promptly light is optical axis with the top normal L of light-emitting area (some light-emitting area is a sphere), and light concentrates on upwards emission in certain angle (as ± 60 °) scope.If according to known backlight technology, directly adopt this class white light LEDs to make as shown in Figure 3 straight-down negative (Direct-type) backlight, on exiting surface, be easy to occur the lamp shadow hot spot.In order to eliminate hot spot, often need to widen exiting surface to the distance between LED, thereby increase the thickness of backlight greatly.If adopt R G the B three-color LED make light source, by the colour mixture synthesize white light, so above-mentioned common LED is because the too upwards concentrated effect that is difficult to reach mixed light of emission angle.In order to overcome the above-mentioned shortcoming of common LED, LED-backlit LED that adopt in the source as shown in Figure 2 at present.On the exiting surface of this class improvement LED, a hemispherical lens and back taper catoptron have been added, the light that sends of LED is just by original top-emission like this, changed side-emitted into, being that 80 ° light path is the strongest luminous position with normal L angle both, is main light-emitting area in ± 20 ° angle.Side-emitting ledly not only can well eliminate the lamp shadow hot spot, and help R G the mixing of B three coloured light.Utilize this class LED to produce the direct LED backlight of thinner thickness.But owing to be added with and incorporate hemispherical lens of LED and back taper catoptron, making this class backlight special LED need be through accurate and complicated technology, and manufacture difficulty is big and cost is high.In addition, because LED, hemispherical lens and back taper catoptron are produced on together, greatly reduce the degree of freedom in the optical design.All above-mentioned shortcomings have all hindered applying of LED-backlit technology to a certain extent.Therefore, press for a kind of general commercial LED that can either be applicable to as shown in Figure 1 in the industry, and make the backlight technology simple, that design freedom is high.
Summary of the invention
The main technical problem to be solved in the present invention is: provides a kind of and can be applicable to most general commercial LED, and low, the easy realization of cost, backlight module that design freedom is high.
In order to achieve the above object, technical solution provided by the present invention is: a led array, a shell, a nonplanar reflector array, light scattering and refraction means.Side wall of outer shell and plate inner wall are the reflection horizon, and led array is arranged on the shell bottom plate.Nonplanar reflector array is arranged on the top of led array with certain altitude.Between led array and reflection mirror array, can optionally add or not add diffusion barrier (plate) optical textures such as (Diffuser Film or Board).Light scattering and refraction means are made up of some diffusion barriers (plate) and prism film optical textures such as (Prism Sheet).From the LED top and near the light launched, scatter through the reflection of nonplanar reflector, thereby avoided on the module exiting surface, occurring LED lamp shadow hot spot.Because the catoptron that adopts structurally separates fully with LED, so should invention make very simply, cost be very low, and is widely used in various led light sources and various led array of arranging, and is very beneficial for improving the inter-industry competition ability.
Advantage of the present invention is: the LED-backlit module that is provided comprises a led array, a shell, a nonplanar reflector array, light scattering and refraction means.Wherein each unit in the led array can be single or one group of white light LEDs, or single or one group of R G B LED.Adopt closely to be arranged in one group of LED that a plurality of LED together form, help luminescence efficiency between the average LED and the difference between the light intensity attenuation, also help R G B LED send monochromatic mixing.
Shell used in the present invention and light scattering and refraction means can be used existing known technology.
The ranks number of reflection mirror array is corresponding with led array, reflection mirror array can be made up of a plurality of nonplanar reflectors that are placed on the transparency carrier, top, unit in each led array is all to there being catoptron, like this, the light that comes out from each LED top-emission is reflexed to periphery and base plate by a nonplanar reflector, the transparency carrier that reflexes to again in the reflection mirror array is launched, and has so just avoided the appearance of lamp shadow hot spot on the module exiting surface.
Because reflection mirror array and LED structurally are independently, so can separately make, reflection mirror array just can be complementary with various LED like this.This independence has improved the degree of freedom in the backlight module optical design greatly, and on the one hand, the pairing LED of each catoptron unit can be a LED, also one group of LED that can be made up of a plurality of LED; On the other hand, can add optical textures such as diffusion barrier (plate) and prism film in addition between reflection mirror array and led array, these measures that can select flexibly all help the effect of astigmatism.
In a word, the present invention can provide a kind of can either be applicable to general commercial LED, realizes the backlight technology that design freedom is high again again easily.Manufacture craft of the present invention is simple, and cost is very low, is very beneficial for improving the competitive power of industry.
Description of drawings
The common top-emission LED of Fig. 1;
Fig. 2 side-emitted LED;
The known LED-backlit module side of Fig. 3 cross section view;
Fig. 4 LED-backlit module side of the present invention cross section view;
Fig. 5 taper reflection mirror array;
The known LED-backlit module of Fig. 6 (a) goes out light effect;
(b) LED-backlit module of the present invention goes out light effect;
Fig. 7 another embodiment of the present invention side cross section view;
The led array vertical view of arranging in Fig. 8 (a) another embodiment of the present invention;
(b) LED layout viewing in the led array unit among this embodiment;
(c) the led array unit surface of intensity distribution among this embodiment.
The drawing reference numeral explanation:
1,2,3,4, LED-backlit module
1, led array 2, shell
3, light scattering and refraction means 4, taper reflection mirror array
5, diffusion barrier (plate)
11, common top-emission LED 12, side-emitted LED
L, normal a, arrow
13, led array unit 21, the outer casing bottom of forming by a plurality of LED
22, side wall of outer shell 23, outer casing bottom reflectance coating
24, side wall of outer shell reflectance coating 41, taper catoptron
42, taper reflection mirror array substrate
Embodiment
Embodiment one: Fig. 4 is a LED-backlit module embodiment provided by the present invention.The light scattering and the refraction means 3 that shell 2, led array 1, taper reflection mirror array 4 are wherein arranged, form by some diffusion barriers (plate) and prism film.
Dug and led array 1 corresponding array of orifices at outer casing bottom 21, led array 1 just is installed in this array of orifices, and light scattering and refraction means are installed in the module top, and its upper surface is exactly the exiting surface of module.The material of shell 2 can be metallic material of aluminum and stainless steel etc.Used LED is highlighted top-emission White LED, and the white light emission mechanism of this LED can be by excitated fluorescent powder emission white light, also can be R G B be mixed into white light.
(Fig. 3) compares with technique known, adds a taper reflection mirror array 4 between led array 1 and light scattering and refraction means 3, and this array is made up of a plurality of taper scintilloscopes 41 that are arranged on the transparency carrier 42.Transparency carrier 41 can be the good inorganic or organic materials of various light transmissions, as optical quartz glass, acryl material etc.A concrete method for making of tapered lens 41 can be: utilizes mould on substrate, to produce cone-shaped body, sticks reflectance coating on the cone-shaped body surface then, or the very high metallic film of reflectivity on the evaporation.Fig. 5 has provided the 3-D view of taper reflection mirror array 4, therefrom can clearly be seen that the design feature of this array.
Light scattering and refraction means 3 are made up of some known diffusion barriers (plate) and prism film.
Fig. 6 (a) and (b) provided the comparison that the backlight module that utilizes known technology design and backlight module provided by the present invention go out light effect respectively.Two kinds of modules have identical length, width and thickness.Can be clear that from Fig. 6 (a), tangible lamp shadow hot spot occur in known configurations light scattering and refraction means.If add a taper reflection mirror array, by Fig. 6 (b) as can be seen, the light distribution of exiting surface significantly improves, and presents the effect of area source substantially.
Embodiment two: as shown in Figure 7, improved on the basis of specific embodiment one, add a known diffusion barrier (plate) 5 between led array 1 and taper reflection mirror array 4.The light distribution uniformity coefficient of module exiting surface can improve 5%-10%.
Embodiment three: as shown in Figure 8, correct on the basis of specific embodiment one, used LED11 is miniwatt top-emission LED, and this LED11 can be the white luminous LED that describes as among the embodiment one, also can be to launch the monochromatic LED of R G B separately.Be one group with a plurality of LED in the present embodiment, form the led array 1 shown in Fig. 8 (a).The evenly distributed mode of such arrangement and all LED is compared following advantage: because the luminous characteristics of each LED all has difference (comprising luminous intensity difference own and later stage light intensity attenuation difference), be a led array unit 13 with a plurality of LED so, the average difference of each LED, the general performance of every group of LED more single led 11 is more uniform and stable; LED closely is arranged in one group, help R G the monochromatic abundant mixing of B.The led array unit 13 that Fig. 8 (b) is made up of 16 LED, Fig. 8 (c) is the light effect that of this unit, as seen, a such led array unit 13 sends the light intensity distribution and a great power LED sends the light intensity distributional class seemingly.So just can utilize the similar structures design backlight module among the embodiment one.
Should be pointed out that the transmitting mirror of using in the reflection mirror array set forth in the present invention, except the taper catoptron that embodiment provided, also can be that sphere waits other various nonplanar reflectors, and all these all belong to the row of this patent covering scope.
Claims (9)
1. a LED-backlit module is characterized in that comprising, a led array, a shell, a nonplanar reflector array, light scattering and refraction means;
Side wall of outer shell and plate inner wall are the reflection horizon;
Led array is arranged on the shell bottom plate;
Nonplanar reflector array is arranged on the top of led array;
Light scattering and refraction means are made up of optical textures such as some diffusion barriers (plate) and prism films.
2. as claims 1 described LED-backlit module, it is characterized in that described reflection mirror array and led array structurally are discrete.
3. as described in claims 2, mirror unit on the reflection mirror array and led array unit are one to one.
4. as claims 1 described LED-backlit module, it is characterized in that the mirror surface shape in the described reflection mirror array is an on-plane surface.
5. can be the taper being convenient to make and sphere etc. as claims 4 described mirror surface shapes.
6. as claims 1 described LED-backlit module, it is characterized in that the unit on the described led array can be made up of single or a plurality of LED.
7. as claims 1 described LED-backlit module, it is characterized in that described led array evenly distributes on shell bottom plate.
8. as claims 1 described LED-backlit module, it is characterized in that between led array and the reflection mirror array optical texture being arranged.
9. can be diffusion barrier and prism film and combination thereof as claims 7 described optical textures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101026743A CN1932607B (en) | 2005-09-13 | 2005-09-13 | LED back light module with nonplanar reflector array |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101026743A CN1932607B (en) | 2005-09-13 | 2005-09-13 | LED back light module with nonplanar reflector array |
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| Publication Number | Publication Date |
|---|---|
| CN1932607A true CN1932607A (en) | 2007-03-21 |
| CN1932607B CN1932607B (en) | 2011-10-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2005101026743A Active CN1932607B (en) | 2005-09-13 | 2005-09-13 | LED back light module with nonplanar reflector array |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101737706B (en) * | 2008-11-14 | 2012-02-08 | 雅马哈发动机株式会社 | Lampshade and lamp structure for scooter motor vehicle |
| CN104613385A (en) * | 2015-02-26 | 2015-05-13 | 深圳市华星光电技术有限公司 | Liquid crystal display and backlight module |
| CN104696828A (en) * | 2015-03-24 | 2015-06-10 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display with backlight module |
| CN108267893A (en) * | 2018-01-23 | 2018-07-10 | 深圳市隆利科技股份有限公司 | A kind of no light guide plate bottom luminous backlight source |
| CN110018594A (en) * | 2019-04-29 | 2019-07-16 | 惠州市华星光电技术有限公司 | Backlight module and display module |
| TWI716100B (en) * | 2019-04-30 | 2021-01-11 | 南韓商喜星電子有限公司 | Diffusion plate and backlight device with light path control function |
-
2005
- 2005-09-13 CN CN2005101026743A patent/CN1932607B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101737706B (en) * | 2008-11-14 | 2012-02-08 | 雅马哈发动机株式会社 | Lampshade and lamp structure for scooter motor vehicle |
| CN104613385A (en) * | 2015-02-26 | 2015-05-13 | 深圳市华星光电技术有限公司 | Liquid crystal display and backlight module |
| CN104696828A (en) * | 2015-03-24 | 2015-06-10 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display with backlight module |
| WO2016150009A1 (en) * | 2015-03-24 | 2016-09-29 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display having backlight module |
| CN108267893A (en) * | 2018-01-23 | 2018-07-10 | 深圳市隆利科技股份有限公司 | A kind of no light guide plate bottom luminous backlight source |
| CN110018594A (en) * | 2019-04-29 | 2019-07-16 | 惠州市华星光电技术有限公司 | Backlight module and display module |
| TWI716100B (en) * | 2019-04-30 | 2021-01-11 | 南韓商喜星電子有限公司 | Diffusion plate and backlight device with light path control function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1932607B (en) | 2011-10-12 |
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