CN1847950A - Light source with light emitting diodes and optical protrusions - Google Patents
Light source with light emitting diodes and optical protrusions Download PDFInfo
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- CN1847950A CN1847950A CNA2005100562705A CN200510056270A CN1847950A CN 1847950 A CN1847950 A CN 1847950A CN A2005100562705 A CNA2005100562705 A CN A2005100562705A CN 200510056270 A CN200510056270 A CN 200510056270A CN 1847950 A CN1847950 A CN 1847950A
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- emitting diode
- light emitting
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- light source
- light
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- 239000003989 dielectric material Substances 0.000 claims description 3
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- 150000002118 epoxides Chemical class 0.000 claims description 2
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- 239000004973 liquid crystal related substance Substances 0.000 description 5
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- 238000003491 array Methods 0.000 description 2
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- 238000004806 packaging method and process Methods 0.000 description 2
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- 239000004593 Epoxy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
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Abstract
A light source with light emitting diodes and optical protrusions comprises an optical plate and at least one optical carrier plate. The light source can be matched with a radiator or an optical component to improve the efficiency. The optical plate forms an optical surface provided with a plurality of optical protrusions to reflect and combine light emitted from the light emitting diodes. The optical carrier is inserted into at least one slot on the optical plate. The optical carrier comprises a heat dissipation core board and at least one electronic circuit layer. The electronic circuit layer can be attached to one or both sides of the heat dissipation core board. The invention makes the combined light have better uniformity and high intensity, and can have the desired color uniformity.
Description
Technical field
(light emitting diode, luminescent system LED) is especially about a kind of light source that is provided with light emitting diode and optical protrusion (protrusion) to the present invention relates to light emitting diode.
Background technology
The light source that is provided with the illumination information source often is required in many application.Particularly (liquid crystal display, LCD), its application in many electronic mediums becomes more and more popular LCD.LCD has application miscellaneous, such as desktop PC, display monitor, image camera, ATM (Automatic Teller Machine) display, TV and aviation display etc.Usually the LCD information that need throw light on and desire to be shown with backlight module.The light source that is used for backlight module is miscellaneous, as daylight lamp and light emitting diode.Daylight lamp price is cheap and do not need complicated control circuit, but is not suitable for sometimes in the application of some chromaticity that need get well and long bulb life.The light source that light emitting diode is used as liquid crystal display backlight module has many reasons.Compare with fluorescent bulb, the advantage of LED source comprises: the life-span is long, alternative easily, mechanical property is sane and chromaticity is preferable.The color uniformity (chromaticity) that needs to launch from liquid crystal display backlight module in some application (as the aviation class) is clear and definite.Yet the obtainable light emitting diode of most of commercializations, the selection of its color uniformity are limited and color uniformity can change in time.
Figure 1 shows that a kind of LED source that is disclosed in the high formula light emitting diode 100 of support of the 6th, 666, No. 567 patents of the U.S., be used for improving the color uniformity of combined light (combined light).This supports high formula light emitting diode 100 and comprises a light emitting diode 101.This light emitting diode 101 is enclosed in 102 li of LED package.This LED package 102 is supported on optical resonant cavity plate (floor of opticalcavities) 103 tops.This supports high formula structure and allows that light goes out from led based bottom emission.In addition, have reflexive protrusion and can place this below of supportting high formula light emitting diode, assist correcting light to navigate on track.A kind of structure that is become by fluorescent bulb and light emitting diode combined also is suggested, to form a kind of hybrid light source (hybrid light source).Yet all these technology have increased the complexity and the cost of light source.
As shown in Figures 2 and 3, it is disclosed in the U.S. the 6th, the LCD 200 of 608, No. 614 patents, this LCD 200 comprise the first light emitting diode array 201 and the second light emitting diode array 202 that light second color uniformity is provided that light first color uniformity is provided.The light of launching from light emitting diode array 201 and 202 passes light combine component 301 (for example, waveguide), then towards 302 projections of LCD storehouse.The light of LED crystal particle emission is usually approximately perpendicular to the direction of grain surface.The direction of light of launching from light emitting diode array 201 and 202 is almost vertical separately and be parallel to surfaces of mirror plate.This light source needs light combine component 301 separately.The adjustment of the color uniformity of combined light only can be by passing the color uniformity that a control system changes the second light emitting diode array 202, and therefore, the adjustment of color uniformity is flexible restriction.
According to the content that another prior art disclosed, as shown in Figure 4, be a kind of Luxeon side formula-transmitter (side-emitter) with encapsulation LED crystal grain.Luxeon side formula-transmitter can provide combined light good uniformity coefficient, but light intensity is relatively poor.In addition, the structure of encapsulation LED crystal grain takies bigger area than naked crystalline granular texture of the present invention usually.
Well known, most of its direct of travels of light of launching from LED crystal particle are approximately perpendicular to grain surface.Therefore, LED crystal particle needs to be adjusted to a certain extent, makes light from the LED crystal particle emission before arriving display screen, has an opportunity to make up and be mixed into the color uniformity of wanting.Fundamental purpose of the present invention is to use a kind of low complex degree and system cheaply, realizes the chromaticity that the high strength of light is become reconciled.
Summary of the invention
The present invention can realize the multiple advantage of LED source.Its fundamental purpose provides a kind of light source that is provided with light emitting diode and optical protrusion.It has saved the needs of encapsulation LED crystal grain, thereby has reduced cost and space.Because the high packaging density (packaging density) of light emitting diode is so also can realize high light intensity.
In the first embodiment of the present invention, LED source comprises an optical sheet (optical panel) and at least one optics support plate (optical plate).This light source can be arranged in pairs or groups and be used a heating radiator (heat sink), to improve its usefulness.This optical sheet formation one has the optical surface of a plurality of optical protrusions, with the light that reflects and combination is launched from light emitting diode.This optics support plate is inserted at least one slot (slot) on the optical sheet.This optics support plate comprises a heat radiation core board (heat dissipation core plate) and reaches one deck electronic circuit layer at least.The electronic circuit layer comprises a light emitting diode and at least one is used for controlling the electronic circuit of the naked crystal grain work of light emitting diode.
In the second embodiment of the present invention, LED source comprises an optical module (opticalelement).This optical module is used for guiding previously mentioned combined light towards display screen.This optical module can be diffuser (light diffuser) or waveguide (wave guide).
This optics support plate can comprise a heat radiation core board and two-layer electronic circuit layer.Two-layer electronic circuit layer respectively attached to the heat radiation core board each limit.The optics support plate also can comprise a heat radiation core board and one deck electronic circuit layer.This electronic circuit layer is monolateral attached to the heat radiation core board.
According to the present invention, light emitting diode engages (wirebonding) via flip-chip (flip chip) or routing and is attached to the electronic circuit layer.Light emitting diode adheres to towards the mode of optical protrusion with its grain surface.Therefore, the light of launching from different LED crystal particle has an opportunity to be reflected and to be combined into the color uniformity of wanting before arriving display screen.These light emitting diodes can get up with transparency material (transparent material) envelope, to avoid and air reaction.This control circuit is used to provide LED power source, control light-emitting diode luminance, the light emitting diode electrostatic protection is provided (electrostaticdischarge protection) and adjust combination after the color uniformity of light, to meet application demand.This control circuit can be stacking-type (stacked) or print (printed) in the electronic circuit layer.
Simulation result shows that the light after the combination has preferable uniformity coefficient and high strength, and has the color uniformity of wanting.Combined light can be guided by diffuser or waveguide.In addition, the heat radiation core board is connected to heating radiator usually, to improve its heat dissipation and to increase light source life.LED source of the present invention can be taken as liquid crystal display backlight module and use.
Now cooperate the detailed description of following drawings and Examples, will on address other purpose of the present invention and advantage and be specified in after.
Description of drawings
Fig. 1 is the high formula light-emitting diode structure of known support figure.
Fig. 2 be another known be the LCD backlight structural drawing of substrate with the light emitting diode.
Fig. 3 is the front elevation of LCD backlight texture edge among Fig. 2.
Fig. 4 is a Luxeon side formula-transmitter.
Fig. 5 A is a kind of vertical view that is provided with the light source of light emitting diode and optical protrusion in the first embodiment of the invention.
Fig. 5 B is the enlarged drawing of optics support plate among Fig. 5 A.
Fig. 6 is a kind of structural drawing that is provided with the light source of light emitting diode and optical protrusion in the second embodiment of the invention.
Fig. 7 A is flip-chip bond figure.
Fig. 7 B is an edge routing index map.
Fig. 7 C is a center routing index map.
Fig. 8 is that combined light is at the intensity map of screen surface by a left side/end to the right side/top.
Wherein, description of reference numerals is as follows:
High formula light emitting diode 101 light emitting diodes of 100 supports
102 LED package, 103 optical resonant cavity plates
201 first light emitting diode arrays, 202 second light emitting diode arrays
301 smooth combine component 302 LCD storehouses
500 light sources, 501 optical sheets
502 heating radiators, 503 optical protrusions
504 light emitting diodes, 505 optics support plates
506 electronic circuit layers, 507 control circuit
508 heat radiation core boards, 509 slots
600 light sources, 602 optical modules
601 display screens, 701 LED crystal particle
702 LED crystal particle, 703 LED crystal particle
Embodiment
Fig. 5 A and Fig. 5 B are depicted as according to an a kind of preferred embodiment that is provided with the light source 500 of light emitting diode and optical protrusion of the present invention.With reference to figure 5A, light source 500 comprises an optical sheet 501 and at least one optics support plate 505.This optical sheet 501 forms an optical surface with a plurality of optical protrusions 503, is used for reflecting and making up the light of launching from light emitting diode 504, and advancing of light almost is parallel to the surface of optical sheet 501.Optics support plate 505 is inserted at least one slot 509 on the optical sheet 501, slot 509 can be across a runner plate edge (panel edge) to another runner plate edge, light source 500 can be arranged in pairs or groups and be used a heating radiator, to improve its usefulness, for example, one heating radiator 502 (showing with dotted line) is attached to optical sheet 501, to improve its heat radiation.
Shown in Fig. 5 B, optics support plate 505 also comprises a heat radiation core board 508 and at least one is attached to the electronic circuit layer 506 on the heat radiation core board 508.Electronic circuit layer 506 also comprises at least one light emitting diode 504 and at least one is used for controlling the control circuit 507 of naked crystal grain (bare chip) work of light emitting diode 504.
Light after the combination can be led to diffuser or waveguide further.In addition, heat radiation core board 508 is connected to heating radiator 502 usually, to improve its heat dissipation and to increase life-span of light source 500.Light source 500 of the present invention can be taken as liquid crystal display backlight module and use, and it saves the needs of encapsulation LED crystal grain, thereby has reduced cost and space.Yet this light source also can use the LED light lamp (LED lamp) after the encapsulation, and it is not limited to use the naked crystal grain of light emitting diode.
Attached to each limit of heat radiation core board 508, the light emitting diode 504 on the electronic circuit layer is exposed to optical surface to electronic circuit layer 506 respectively, with emission light.Light emitting diode 504 is in the mode of its grain surface towards optical protrusion 503, is attached to electronic circuit layer 506.Therefore, the light of most of LED crystal particle emission is towards optical protrusion 503 emissions.By optical protrusion 503, light can be in optical surface reflection and combination.In addition, also can be that one deck electronic circuit layer 506 is monolateral attached to heat radiation core board 508.The light emitting diode of adjacency is launched the visual different application of identical or different color and is decided.
Control circuit 507 is used to provide the color uniformity of the power supply of light emitting diode 504, the brightness of control light emitting diode 504, the electrostatic protection that light emitting diode is provided and adjustment combined light, to meet application demand.Control circuit 507 can be stacking-type or be printed on electronic circuit layer 506.
Figure 6 shows that according to a kind of second embodiment that is provided with the light source 600 of light emitting diode and optical protrusion of the present invention.Optical module 602 is placed between a display screen 601 and the light source 500, and optical module 602 is used to guide combined light towards display screen 601, as the LCD storehouse.Optical module 602 can be diffuser or waveguide.
According to different application, optical protrusion can reach shape and form in any manner with any suitable material.The shape of optical protrusion can be pyramid (pyramidal) or conical (conic) or parabola shaped (parabolic) or hemisphere face shape (semispherical) without limits.The electronic circuit layer is to be made by an insulation course (insulating layer), for example printed circuit board (PCB) (PCB), oxide (oxide), ceramics material (ceramic material) etc.These light emitting diodes can seal with transparent material, to avoid and air reaction.Moreover the transparent material of selecting to be fit to refractive index can be avoided total reflection (total reflection).Transparent material can be selected in the group of epoxide (epoxy) and silicon-oxygen polymer (silicone).Heat radiation core board material can be selected in the group of dielectric material (dielectric material), electrical conductor (electrical conductor) or heat conduction conductor (thermal conductor).
According to the present invention, light emitting diode engages via flip-chip or routing and is attached to the electronic circuit layer.Fig. 7 A is depicted as the situation of a flip-chip bond, LED crystal particle 701 is bonding on paste (paste) or scolding tin (solder) on the pedestal (substrate) of electronic circuit layer 506, and flip-chip bond saves the needs that chip are electrically connected to external circuit that traditional routing engages.It is the joint that is electrically connected to control circuit that the joint sheet of flip-chip (bonding pads) also is used as.Flip-chip bond often is used to need little pattern (small form factor) or have highdensity joint sheet (bonding pads).Routing engages and comprises that the edge routing engages and the center routing engages.Fig. 7 B and Fig. 7 C represent that respectively the edge routing engages and the center routing engages.Wherein LED crystal particle 702 or LED crystal particle 703 are bonding on the pedestal of electronic circuit layer 506 with paste or scolding tin earlier, engage the connection of finishing to control circuit with the metal routing again.
In the chromaticity diagram after the emulation of the combined light of screen surface, the light source that is provided with light emitting diode and optical protrusion of the present invention has been described, the color uniformity of its combined light can coincide and meet target white (targeted white color).Light intensity is also strong than traditional structure.Fig. 8 further is presented at the combined light intensity of screen surface by a left side/end to the right side/top.Transverse axis is represented the position of screen, and solid line is represented the horizontal composition of light intensity, and dotted line is represented the vertical composition of light intensity.The result is presented at level and vertical direction, and combined light all has preferable uniformity coefficient and high strength and can have the color uniformity of wanting.
The above is preferred embodiment of the present invention only, is not in order to limit scope of the invention process.All equalizations of doing according to scope disclosed by the invention change and modify, and all should belong to the scope of the present patent application protection.
Claims (23)
1. light source that is provided with light emitting diode and optical protrusion includes:
One optical sheet which is provided with at least one slot, and is provided with a plurality of optical protrusions with reflection and combined light; And
At least one optics support plate, this optics support plate is inserted at least one slot on this optical sheet, each optics support plate is provided with heat radiation core board and one deck electronic circuit layer at least, and every layer of electronic circuit layer is provided with at least one light emitting diode and is used for controlling the control circuit of this light emitting diode work with at least one.
2. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 1, wherein this light emitting diode is the naked crystal grain that seals with transparent material.
3. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 2, wherein this transparent material is selected from the group of epoxide and silicon-oxygen polymer.
4. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 1, wherein this light emitting diode is an encapsulation LED.
5. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 1, wherein the material of this heat radiation core board is selected from the group of dielectric material, electrical conductor or heat conduction conductor.
6. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 1, wherein the shape of this optical protrusion comprises pyramid, taper shape, parabola shaped and hemisphere face shape.
7. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 1, wherein this electronic circuit layer is an insulation course.
8. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 1, wherein this control circuit is stacked on this electronic circuit layer.
9. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 1, wherein this control circuit is printed on this electronic circuit layer.
10. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 2, wherein the naked crystal grain of this light emitting diode is attached to this electronic circuit layer via a flip-chip.
11. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 2, wherein the naked crystal grain of this light emitting diode is to engage via routing to be attached to this electronic circuit layer.
12. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 2, wherein the naked crystal grain of this light emitting diode is to be attached to the electronic circuit layer with its grain surface towards the mode of optical protrusion.
13. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 1, wherein the light emitting diode of adjacency is launched the light of different colours.
14. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 1, wherein the light emitting diode of adjacency is launched the light of same color.
15. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 1, wherein this optics support plate is provided with two-layer electronic circuit layer, and one deck electronic circuit layer is all adhered on each limit of this heat radiation core board.
16. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 1, wherein this optics support plate is provided with one deck electronic circuit layer, and this electronic circuit layer is monolateral attached to this heat radiation core board.
17. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 1, wherein this light source also comprises a heating radiator, and this heating radiator is attached to this optical sheet, with enhance heat.
18. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 1, wherein this light source also comprises one and is used for guiding the optical module of this combined light towards a display screen.
19. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 7, wherein this electronic circuit layer is selected from printed circuit board (PCB), oxide and ceramics material group.
20. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 18, wherein this optical module is a diffuser.
21. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 18, wherein this optical module is a waveguide.
22. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 18, wherein this optics support plate is provided with two-layer electronic circuit layer, and one deck electronic circuit layer is all adhered on each limit of this heat radiation core board.
23. the light source that is provided with light emitting diode and optical protrusion as claimed in claim 18, wherein this optics support plate is provided with one deck electronic circuit layer, and this electronic circuit layer is monolateral attached to this heat radiation core board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100562705A CN100401163C (en) | 2005-04-05 | 2005-04-05 | Light source with light emitting diode and optical protrusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100562705A CN100401163C (en) | 2005-04-05 | 2005-04-05 | Light source with light emitting diode and optical protrusion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1847950A true CN1847950A (en) | 2006-10-18 |
| CN100401163C CN100401163C (en) | 2008-07-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100562705A Expired - Fee Related CN100401163C (en) | 2005-04-05 | 2005-04-05 | Light source with light emitting diode and optical protrusion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100401163C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101487583B (en) * | 2008-01-16 | 2010-09-29 | 富士迈半导体精密工业（上海）有限公司 | Illuminating apparatus |
| CN101677118B (en) * | 2008-09-18 | 2011-03-16 | 广镓光电股份有限公司 | Semiconductor luminous element |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05289076A (en) * | 1992-04-13 | 1993-11-05 | Alps Electric Co Ltd | Liquid crystal display device |
| US6307527B1 (en) * | 1998-07-27 | 2001-10-23 | John S. Youngquist | LED display assembly |
| US6666567B1 (en) * | 1999-12-28 | 2003-12-23 | Honeywell International Inc. | Methods and apparatus for a light source with a raised LED structure |
| US6608614B1 (en) * | 2000-06-22 | 2003-08-19 | Rockwell Collins, Inc. | Led-based LCD backlight with extended color space |
-
2005
- 2005-04-05 CN CNB2005100562705A patent/CN100401163C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101487583B (en) * | 2008-01-16 | 2010-09-29 | 富士迈半导体精密工业（上海）有限公司 | Illuminating apparatus |
| CN101677118B (en) * | 2008-09-18 | 2011-03-16 | 广镓光电股份有限公司 | Semiconductor luminous element |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100401163C (en) | 2008-07-09 |
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Granted publication date: 20080709 Termination date: 20200405 |