CN201795372U - LED backlight structure with inverted light source and using freeform surface reflector - Google Patents
LED backlight structure with inverted light source and using freeform surface reflector Download PDFInfo
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- CN201795372U CN201795372U CN201020110514XU CN201020110514U CN201795372U CN 201795372 U CN201795372 U CN 201795372U CN 201020110514X U CN201020110514X U CN 201020110514XU CN 201020110514 U CN201020110514 U CN 201020110514U CN 201795372 U CN201795372 U CN 201795372U
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Abstract
An LED backlight structure with an inverted light source and using a freeform surface reflector comprises a backlight cavity (4) and an LED light source (1), a freeform surface reflection plane (2) is arranged at the bottom of the backlight cavity (4), the backlight cavity (4) is an enclosed cavity body formed by an inner reflective wall, the freeform surface reflection plane (2) at the bottom and a diffuser film (5) at the top together, an optical film layer such as a brightness enhancement film and an LCD panel are arranged on the diffuser film (5), the LED light source (1) is fixed on the backlight cavity (4) via a light source support (3), arranged under the diffuser film (5) and right above the axis of the freeform surface reflection plane (2) at the bottom of the backlight cavity (4), and light emergence direction is opposite to the LED panel. The LED backlight structure has the advantages that light emergence angle of the light source is wide, the thickness of the integral backlight system is small, and the integral lighting effect is high.
Description
Technical field
The utility model relates to a kind of back light system, particularly a kind of light source be inverted and use the LED-backlit structure of free-form surface reflector.
Technical background
In recent years, the market of flat-panel monitor is along with the development of consumption electronic product is increasing, and wherein, (Liquid Crystal Display LCD) accounts for the share of FPD near 90% to LCD.LCD is as a kind of passive luminescent device, and itself can be not luminous, for transmission type lcd device, must rely on back light that light is passed display floater, represents graph image.Cold-cathode tube (Cold Cathode Fluorescent Lamp, CCFL) and light emitting diode (Light Emitting Diodes LED) is two kinds of major techniques of present LCD backlight.The main advantage of LED-backlit is: color reducibility is good, low energy consumption, extra long life, response speed fast, better electricity optics control performance, material do not have environment public hazards, integral product more frivolous, do not contain fragile part or the like.In the long run, the white light LEDs of high-color rendering or RGB three-primary color LED are backlight is the most promising in the LCD backlight technology.
LED-backlit is divided into two kinds of Edge Lighting (side following formula) and DirectLighting (straight-down negative) according to its optical texture.The light source arrangement of side following formula is evenly distributed to light on the panel by Light Guide Plate (LGP) in LCD panel side, and the light source of straight-down negative directly is arranged in the liquid crystal panel below, does not need LGP.In general, side light type LED backlight integral thickness is thinner, is applicable to the small-medium size display; Direct-light type LED backlight light uniformity height is not restricted by display sizes, is easy to realize dynamic area contrast control.
In the side light type LED backlight, the light of LED outgoing is coupled in the process of LGP, and the light energy loss can take place, LGP with the turn light rays of horizontal direction incident in the process of LCD panel direction, also there is energy loss, coupling efficiency and leaded light efficient have restricted the whole light efficiency of side type backlight jointly, in general, the whole light efficiency of actual side down type backlight system is not higher than 75%, has limited the performance of LED-backlit power savings advantages; And the leaded light area of LGP has certain limitation at present, and the leaded light area of monolithic LGP is generally less than 30 inches diagonal, and the oversize display will use the polylith LGP, has increased the difficulty of optical design and the complexity of system.
In direct-light type LED backlight, a kind of technical scheme has been used side-emitting led (Side Emitter LED) as described in U.S. Pat 6607286 and the US6679621, and the light energy of LED outgoing concentrates in the scope of horizontal direction ± 20 °.This based on side-emitting led back light system in, the inwall of backlight cavities is coated with highly reflective material, the light that LED sends interreflection in backlight cavities finally forms uniform light energy distribution at the panel place.Though this backing structure uniformity height, light has lost a lot of energy in the process of interreflection, and whole light efficiency is on the low side.Another kind of technical scheme is with LED distributed arranging below panel, because going out the space angle distribution of light energy, LED generally concentrates on axis direction, LED need with the LCD panel at a distance of certain distance, could guarantee that target face illumination is even, in general, the thickness of distribution type LED direct-type backlight is greater than the side light type LED backlight.
In order to reduce the thickness of distribution type LED direct-type backlight, a kind of technical scheme is the density of arranging that increases the distributed LED of arranging, can reduce system's thickness to a certain extent, but this technical scheme can cause the number of LED sharply to increase, 22 cun panels use the number of LED to surpass 1000, can bring a series of problems such as light source uniformity, reliability, power drives; Another kind method is to use secondary lens to increase the LED rising angle, can reduce system's thickness equally, the existing at present free-form surface lens through the precision optics design is applied among the LED-backlit, but when being to use secondary lens to change the beam projecting direction, because the existence of total internal reflection, the beam projecting angle can not increase too much, and then the degree that reduces of back light system thickness is also limited, compares the side type backlight and also has certain gap.
The utility model content
The technical problems to be solved in the utility model is, provides a kind of light source rising angle big, and the thickness of whole back light system is little, and the LED-backlit structure of free-form surface reflector is inverted and is used to the light source that whole light efficiency is high.
For addressing the above problem, the LED-backlit structure of free-form surface reflector is inverted and is used to a kind of light source of the present utility model, comprise backlight cavities and led light source, it is characterized in that: described backlight cavities bottom is the free form surface reflecting surface, backlight cavities is by the free form surface reflecting surface of its inner reflective wall and bottom and place the diffusion barrier at its top to constitute the cavity of a sealing jointly, is provided with optical film and LCD panels such as brightness enhancement film on diffusion barrier; Described led light source is fixed in the backlight cavities by the light source bracing frame, be in directly over the axis of the below of optical film such as diffusion barrier, brightness enhancement film and LCD panel and backlight cavities bottom free form surface reflecting surface, and the beam projecting direction deviates from mutually with the LCD panel.
Described led light source is a back light unit (BLU) or a plurality of back light unit, and the arrangement mode of a plurality of back light units can be linearity, annular, but the arrangement mode of a plurality of back light units is not limited to above form; The light that one or more back light units send can both form the uniform illumination distribution by the backlight cavities end face that is reflected in of this free form surface reflecting surface.
The spectrum of the light emitted line of described back light unit should satisfy the required requirement backlight of liquid crystal panel, can be white light LEDs or three primary colours (RGB) LED; If use white light LEDs, then each white light LEDs constitutes a back light unit; If adopt three primary colours (RGB) LED, then by a redness, a blueness, two greens totally four LEDs constitute a back light unit, but the composition mode of different wave length LED is not limited to above form in back light unit; The packing forms of LED (comprising white light LEDs and three-primary color LED) can be surface patch encapsulation or other packing forms that do not contain secondary lens, and bright dipping luminous intensity distribution type can be approximate lambert's type.
All be coated with highly reflective material at the bottom of described backlight cavities free form surface reflecting surface and inner reflective wall, reflectivity is greater than 70%.
Described light source bracing frame is simultaneously for led light source provides heat radiation, effects such as power supply introducing, and it is forms such as single piece of metal bar or double joint bonding jumper, but must not influence final illuminating effect.
Described free form surface reflecting surface is that a separate unit or a plurality of free form surface reflecting surface cellular array are arranged in whole backing structure; If a plurality of free form surface reflecting surface cellular arraies are arranged, each free form surface reflecting surface unit is corresponding to a backlight sub-chamber of independently sealing, in sub-chamber backlight, be fixed with led light source by the light source bracing frame, the sub-chamber independently backlight close-packed array of a plurality of sealings is arranged and is constituted whole backlight cavities, or connects the backlight cavities of back corresponding to the sealing of an integral body by a plurality of free form surface reflectings surface unit of array arrangement.
Distribute for uniform illumination is formed on the bottom that is implemented in optical films such as diffusion barrier, brightness enhancement film, the free form surface reflecting surface is relative with the LCD panel, then most of light of led light source outgoing can be directly to and reaches this free form surface reflecting surface, this reflecting surface is accurately controlled the light reflection direction, make most of light of LED outgoing arrive the backlight cavities top, form uniform illumination and distribute by reflex; The inner reflective wall of backlight cavities also reflexes to the backlight cavities top with the light that small part does not have directly to arrive the backlight cavities top, to improve the uniformity of illuminance of backlight cavities end face.
Finally, optical films such as the diffusion barrier at backlight cavities top, brightness enhancement film are converted into required Luminance Distribution with the uniform illumination distribution.
Adopt a kind of light source of the present utility model to be inverted and to use the LED-backlit structure of free-form surface reflector, it is big to have a light source rising angle, and the thickness of whole back light system is little, the advantage that whole light efficiency is high.
Description of drawings
Fig. 1 is the structural representation of first kind of specific embodiment of the present utility model.
Fig. 2 is the cutaway view of Fig. 1 along the A-A direction.
Fig. 3 is the structural representation of second kind of specific embodiment of the present utility model.
Fig. 4 is the cutaway view of Fig. 3 along the A-A direction.
Fig. 5 is the structural representation of the third specific embodiment of the present utility model.
Fig. 6 is the cutaway view of Fig. 5 along the A-A direction.
Fig. 7 is the structural representation of the 4th kind of specific embodiment of the present utility model.
Fig. 8 is the cutaway view of Fig. 7 along the A-A direction.
Fig. 9 is the structural representation of the 5th kind of specific embodiment of the present utility model.
Figure 10 is the cutaway view of Fig. 9 along the A-A direction.
Figure 11 is the structural representation of the 6th kind of specific embodiment of the present utility model.
Figure 12 is the cutaway view of Figure 11 along the A-A direction.
The specific embodiment
Further specify embodiment of the present utility model below in conjunction with accompanying drawing:
As depicted in figs. 1 and 2, the LED-backlit structure of free-form surface reflector is inverted and is used to a kind of light source, comprise backlight cavities 4 and led light source 1, described backlight cavities 4 bottoms are a free form surface reflecting surface 2, backlight cavities 4 is by the free form surface reflecting surface 2 of its inner reflective wall and bottom and place the diffusion barrier 5 at its top to constitute the cavity of a sealing jointly, is provided with first brightness enhancement film 61, second brightness enhancement film 62 and LCD panel on diffusion barrier 5; Described led light source 1 is fixed in the backlight cavities 4 by light source bracing frame 3, be in the below of diffusion barrier 5, first brightness enhancement film 61, second brightness enhancement film 62 and LCD panel and the axis top of backlight cavities 4 bottom free form surface reflectings surface 2, and the beam projecting direction deviates from mutually with the LCD panel.
All be coated with highly reflective material at the bottom of described backlight cavities 4 free form surface reflecting surface 2 and inner reflective wall, reflectivity is greater than 70%.
Described led light source 1 is a back light unit, and back light unit is a white light LEDs; Light source bracing frame 3 is the single piece of metal bar, and it is fixedly connected on the inner reflective wall of backlight cavities 4.
The reflection direction of the light that free form surface reflecting surface 2 accurate control white light LEDs send forms uniform illumination at the top of backlight cavities 4 and distributes; The inner reflective wall of backlight cavities 4 also has high reflectance, and the light that does not directly reach the reflection cavity top by reflection is to improve the target face uniformity; Finally, the diffusion barrier 5 at backlight cavities 4 tops, first brightness enhancement film 61, second brightness enhancement film 62 distribute uniform illumination and are converted into required Luminance Distribution.
As shown in Figure 3, Figure 4, the LED-backlit structure of free-form surface reflector is inverted and is used to a kind of light source, comprise backlight cavities 4, led light source 1, light source bracing frame 3, diffusion barrier 5, first brightness enhancement film 61 and second brightness enhancement film 62, overall structure is similar to embodiment 1, the main distinction is: the light source bracing frame 3 in the present embodiment is the double joint bonding jumper, and it is fixedly connected on the backlight cavities 4.
As Fig. 5, shown in Figure 6, the LED-backlit structure of free-form surface reflector is inverted and is used to a kind of light source, comprise backlight cavities 4, led light source 1, light source bracing frame 3, diffusion barrier 5, first brightness enhancement film 61 and second brightness enhancement film 62, overall structure is similar to embodiment 1, and the main distinction is:
The led light source 1 of present embodiment is one group of back light unit that line style is arranged, and each back light unit is a white light LEDs, and each white light LEDs is separately fixed on the light source bracing frame 3, and light source bracing frame 3 is the double joint bonding jumper.
As Fig. 7, shown in Figure 8, the LED-backlit structure of free-form surface reflector is inverted and is used to a kind of light source, comprise backlight cavities 4, led light source 1, light source bracing frame 3, diffusion barrier 5, first brightness enhancement film 61 and second brightness enhancement film 62, overall structure is similar to embodiment 1, and the main distinction is:
Described led light source 1 is one group of back light unit that line style is arranged, and each back light unit is made up of three primary colours (RGB) LED, promptly by 12, two green LED 13 of 11, one blue leds of a red LED totally four LEDs constitute.
As Fig. 9 and shown in Figure 10, the LED-backlit structure of free-form surface reflector is inverted and is used to a kind of light source, comprise backlight cavities 4, led light source 1, light source bracing frame 3, diffusion barrier 5, first brightness enhancement film 61 and second brightness enhancement film 62, described backlight cavities 4 is made of the backlight sub-chamber 41 of 2 * 3 array arrangements.
Each sub-chamber 41 backlight is the cavity of a sealing, it is by the free form surface reflecting surface unit 21 of inner reflective wall and bottom and place the diffusion barrier 5 at backlight cavities 4 tops to define jointly, be provided with ground floor brightness enhancement film 61 and second layer brightness enhancement film 62 and LCD panel on diffusion barrier 5, wherein the reflectivity of the inner reflective wall in free form surface reflecting surface unit 21 and sub-chamber 41 backlight is greater than 70%.
The internal structure in each sub-chamber 41 backlight is similar to embodiment 1, land 41 one-tenth 2 * 3 array arrangements in sub-chamber backlight, the zone combination that a land uniform illumination distributes, forming uniform illumination at backlight cavities 4 end faces distributes, diffusion barrier 5, first brightness enhancement film 61, second brightness enhancement film 62 place on the backlight cavities 4, and uniform illumination is distributed is converted into required Luminance Distribution.
Embodiment 6
As Figure 11 and shown in Figure 12, the LED-backlit structure of free-form surface reflector is inverted and is used to a kind of light source, comprise backlight cavities 4, led light source 1, light source bracing frame 3, diffusion barrier 5, first brightness enhancement film 61 and second brightness enhancement film 62, described backlight cavities 4 is made of the backlight sub-chamber 41 of 2 * 1 array arrangements.
Each sub-chamber 41 backlight is the cavity of a sealing, it is by the free form surface reflecting surface unit 21 of inner reflective wall and bottom and place the diffusion barrier 5 at backlight cavities 4 tops to define jointly, be provided with ground floor brightness enhancement film 61 and second layer brightness enhancement film 62 and LCD panel on diffusion barrier 5, wherein the reflectivity of the inner reflective wall in free form surface reflecting surface unit 21 and sub-chamber 41 backlight is greater than 70%.
The internal structure in each sub-chamber 41 backlight is similar to embodiment 3, be that each sub-chamber backlight 41 interior led light source 1 is one group of back light unit that line style is arranged, each back light unit is a white light LEDs, and each white light LEDs is separately fixed on the light source bracing frame 3, and light source bracing frame 3 is the double joint bonding jumper.41 one-tenth 2 * 1 array arrangements in two sub-chambeies backlight, two zone combinations that uniform illumination distributes, form uniform illumination at backlight cavities 4 end faces and distribute, diffusion barrier 5, first brightness enhancement film 61, second brightness enhancement film 62 place on the backlight cavities 4, and uniform illumination is distributed is converted into required Luminance Distribution.
Claims (8)
1. the LED-backlit structure of free-form surface reflector is inverted and is used to a light source, comprise backlight cavities (4) and led light source (1), it is characterized in that: described backlight cavities (4) bottom is free form surface reflecting surface (2), backlight cavities (4) is by the free form surface reflecting surface (2) of its inner reflective wall and bottom and place the diffusion barrier (5) at its top to constitute the cavity of a sealing jointly, is provided with brightness enhancement film and LCD panel on diffusion barrier (5); Described led light source (1) is fixed in the backlight cavities (4) by light source bracing frame (3), be in directly over the axis of the below of diffusion barrier (5), brightness enhancement film LCD panel and backlight cavities (4) bottom free form surface reflecting surface (2), and the beam projecting direction deviates from mutually with the LCD panel.
2. the LED-backlit structure of free-form surface reflector is inverted and is used to a kind of light source according to claim 1, it is characterized in that: described led light source (1) is a back light unit (BLU) or a plurality of back light unit, and the arrangement mode of a plurality of back light units can be linearity, annular; The light that one or more back light units send can both form the uniform illumination distribution by the backlight cavities end face that is reflected in of this free form surface reflecting surface.
3. the LED-backlit structure of free-form surface reflector is inverted and is used to a kind of light source according to claim 2, it is characterized in that: the spectrum of the light emitted line of described back light unit should satisfy the required requirement backlight of liquid crystal panel, can be white light LEDs or three primary colours (RGB) LED.
4. the LED-backlit structure of free-form surface reflector is inverted and is used to a kind of light source according to claim 3, it is characterized in that: when described back light unit was white light LEDs, then each white light LEDs constituted a back light unit; When described back light unit was three primary colours (RGB) LED, then by a redness, a blueness, two greens totally four LEDs constituted a back light unit.
5. the LED-backlit structure of free-form surface reflector is inverted and is used to a kind of light source according to claim 1, it is characterized in that: all be coated with highly reflective material at the bottom of described backlight cavities (4) free form surface reflecting surface (2) and inner reflective wall, reflectivity is greater than 70%.
6. the LED-backlit structure of free-form surface reflector is inverted and is used to a kind of light source according to claim 1, it is characterized in that: described light source bracing frame (3) is single piece of metal bar or double joint bonding jumper form, but must not influence final illuminating effect.
7. the LED-backlit structure of free-form surface reflector is inverted and is used to a kind of light source according to claim 1, and it is characterized in that: described free form surface reflecting surface (2) is the array arrangement of a separate unit or a plurality of free form surface reflectings surface unit (21) in whole backing structure.
8. the LED-backlit structure of free-form surface reflector is inverted and is used to a kind of light source according to claim 8, it is characterized in that: when described free form surface reflecting surface (2) is the array arrangement of a plurality of free form surface reflectings surface unit (21), each free form surface reflecting surface unit (21) is corresponding to a backlight sub-chamber (41) of independently sealing, in sub-chamber backlight (41), support (3) frame and be fixed with led light source (1) by light source, sub-chamber independently backlight (41) close-packed array of a plurality of sealings is arranged and is constituted whole backlight cavities (4), or connects the backlight cavities (4) of back corresponding to the sealing of an integral body by a plurality of free form surface reflectings surface unit (21) of array arrangement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020110514XU CN201795372U (en) | 2010-04-21 | 2010-04-21 | LED backlight structure with inverted light source and using freeform surface reflector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020110514XU CN201795372U (en) | 2010-04-21 | 2010-04-21 | LED backlight structure with inverted light source and using freeform surface reflector |
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| CN201795372U true CN201795372U (en) | 2011-04-13 |
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| CN201020110514XU Expired - Lifetime CN201795372U (en) | 2010-04-21 | 2010-04-21 | LED backlight structure with inverted light source and using freeform surface reflector |
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Cited By (8)
| 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 |
| CN102606913A (en) * | 2012-02-17 | 2012-07-25 | 漳州市立达信绿色照明有限公司 | Large-angle LED (light emitting diode) lamp |
| CN102901008A (en) * | 2012-09-11 | 2013-01-30 | 彩虹集团公司 | Light-guide-plate-free edge-type LED (light-emitting diode) plane light source device |
| CN103115284A (en) * | 2011-11-16 | 2013-05-22 | Lg电子株式会社 | Backlight unit and display apparatus thereof |
| CN103175016A (en) * | 2011-12-20 | 2013-06-26 | 常熟卓辉光电科技有限公司 | Dynamic light-emitting diode (LED) backlight optical system |
| WO2013149405A1 (en) * | 2012-04-05 | 2013-10-10 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display device |
| CN103423663A (en) * | 2012-05-23 | 2013-12-04 | 冠捷投资有限公司 | Backlight module |
| CN116454193A (en) * | 2023-06-15 | 2023-07-18 | 深圳市康普信息技术有限公司 | LED packaging structure and packaging method thereof |
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2010
- 2010-04-21 CN CN201020110514XU patent/CN201795372U/en not_active Expired - Lifetime
Cited By (13)
| 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 |
| CN103115284B (en) * | 2011-11-16 | 2016-10-05 | Lg电子株式会社 | Back light unit and the display device with this back light unit |
| CN103115284A (en) * | 2011-11-16 | 2013-05-22 | Lg电子株式会社 | Backlight unit and display apparatus thereof |
| US9053650B2 (en) | 2011-11-16 | 2015-06-09 | Lg Electronics Inc. | Backlight unit and display apparatus thereof |
| US9638956B2 (en) | 2011-11-16 | 2017-05-02 | Lg Electronics Inc. | Backlight unit and display apparatus thereof |
| CN103175016A (en) * | 2011-12-20 | 2013-06-26 | 常熟卓辉光电科技有限公司 | Dynamic light-emitting diode (LED) backlight optical system |
| CN102606913B (en) * | 2012-02-17 | 2014-11-19 | 立达信绿色照明股份有限公司 | Large-angle LED (light emitting diode) lamp |
| CN102606913A (en) * | 2012-02-17 | 2012-07-25 | 漳州市立达信绿色照明有限公司 | Large-angle LED (light emitting diode) lamp |
| WO2013149405A1 (en) * | 2012-04-05 | 2013-10-10 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display device |
| CN103423663A (en) * | 2012-05-23 | 2013-12-04 | 冠捷投资有限公司 | Backlight module |
| CN102901008A (en) * | 2012-09-11 | 2013-01-30 | 彩虹集团公司 | Light-guide-plate-free edge-type LED (light-emitting diode) plane light source device |
| CN116454193A (en) * | 2023-06-15 | 2023-07-18 | 深圳市康普信息技术有限公司 | LED packaging structure and packaging method thereof |
| CN116454193B (en) * | 2023-06-15 | 2023-08-22 | 深圳市康普信息技术有限公司 | LED packaging structure and packaging method thereof |
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Granted publication date: 20110413 |