CN101324725B - LCD device and backlight device - Google Patents
LCD device and backlight device Download PDFInfo
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- CN101324725B CN101324725B CN2008101174024A CN200810117402A CN101324725B CN 101324725 B CN101324725 B CN 101324725B CN 2008101174024 A CN2008101174024 A CN 2008101174024A CN 200810117402 A CN200810117402 A CN 200810117402A CN 101324725 B CN101324725 B CN 101324725B
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Abstract
The invention discloses an LCD apparatus and a backlight device. The backlight device comprises a shell body; optical diaphragms and transmission sheets are arranged in the shell body; more than one light emitting unit is arranged between the optical diaphragms and the transmission sheets in the shell body; first printed circuit boards are arranged between the adjacent light emitting units; more than one first light emitting source is arranged on the first printed circuit boards; diffuser sheets covering the areas between the light emitting units are arranged above the first light emitting sources and are fixed on the shell body through a transparent support column; each light emitting unit comprises a light guide plate; a second printed circuit board is arranged on a first side of the light guide plate below the diffuser sheets; more than one second light emitting source is arranged between the second printed board and the light guide board; a third printed circuit board is arranged on the second side of the light guide board corresponding to the first side; and more than one third light emitting source is arranged between the third printed circuit board and the light guide board. The backlight device disclosed by the invention is applicable to large size LCD apparatuses and is thin.
Description
Technical field
The present invention relates to the backlight technology, especially a kind of liquid crystal display and back lighting device.
Background technology
Because liquid crystal itself is not luminous, in various liquid crystal displays such as LCD, LCD TV, all need rely on external light source to realize showing.Current, liquid crystal display (Liquid Crystal Display, hereinafter to be referred as: LCD) become the main flow of FPD gradually.LCD is divided into reflective LCD and transmission type LCD.Wherein, reflective LCD relies on extraneous surround lighting, and transmission type LCD relies on backlight.Therefore, the thickness of backlight has directly determined the thickness of liquid crystal display, if will realize ultrathin display spare, just needs to reduce the thickness of backlight.
The LCD backlight be divided into cold cathode fluorescent tube (Cold Cathode Fluorescent Lamps, hereinafter to be referred as: CCFL) with light emitting diode (Light Emitting Diode, hereinafter to be referred as: LED).For CCFL, LED has many advantages such as development properties is good, long service life, no mercury environmental protection, has become the main flow backlight at present.
The LED-backlit source has side-light type and two kinds of distributed architectures of straight-down negative.The structure in side light type LED back light source is as shown in Figure 1, and it comprises the LGP 101 that is arranged on the housing, and the both sides of this LGP 101 are placed with white light LEDs 102, and there is an end reflectance coating 103 that is arranged on the housing LGP 101 belows.There is a diffusion sheet 104 that is arranged on the housing top of LGP 101, and diffusion sheet 104 tops are provided with one deck blooming piece 105.Be arranged in LGP 101 white light LEDs 102 on every side and launch light into LGP 101; 101 pairs of these incident raies of LGP evenly disperse the back to penetrate from the front; Spread through 104 pairs of light of diffusion sheet again, make that the light luminance that reaches on the blooming piece 105 is even.In this LED-backlit source structure, because white light LEDs is distributed in the LGP both sides, the LED negligible amounts that can place makes that the brightness in entire backlight source is lower.And, be unable to do without LGP in this back light source structure, in the entire backlight source a complete LGP, because the restriction of processing dimension, for the large scale backlight, difficulty is very big in production and processing.In addition,, be not suitable for adopting the red, green, blue three-primary color LED, cause the colour gamut in this LED-backlit source lower because the restriction of structure can only be adopted white light LEDs.
The structure of direct LED backlight is as shown in Figure 2.Keeping at a certain distance away, (also promptly: a plurality of LED201 straight-down negatives wick spacing) are arranged in diffusion sheet 202 belows, are provided with end reflectance coating 203 between the adjacent LED 201, are used for the light of LED201 emission is reflexed to diffusion sheet 202.Diffusion sheet 202 is provided with one deck blooming piece 204, is used to improve brightness, homogeneity, colourity and the visual angle of light.The light of each LED201 emission is transmitted into diffusion sheet 202 through light mixing distance (also promptly: LED201 is to the distance of diffusion sheet 202) and carries out mixed light, forms the even brightness white light.In this LED-backlit source structure, must obtain certain light mixing distance between LED201 and the diffusion sheet, make this LED-backlit source be unfit to do thin.If come less light mixing distance through reducing the wick spacing, thereby reduce backlight thickness, owing to reduce the brightness that the wick spacing need reduce each LED, then need increase the usage quantity of LED, this has just increased the production cost in LED-backlit source.
Summary of the invention
The purpose of the embodiment of the invention is: a kind of back lighting device that is applicable to the large scale liquid crystal display device and has less thickness is provided, and the liquid crystal display that comprises this back lighting device.
For realizing the foregoing invention purpose; A kind of back lighting device provided by the invention; Comprise housing, be provided with blooming piece and reflector plate in this housing, be provided with the luminescence unit that is distributed in more than on the same plane between inherent blooming piece of said housing and the reflector plate; Be provided with first printed circuit board (Printed Circuit Board between adjacent two luminescence units; Hereinafter to be referred as: PCB), this first printed circuit board is provided with first light emitting source more than, and said first light emitting source top is provided with the diffusion sheet that covers zone between the said luminescence unit; This diffusion sheet is fixed on the said housing through a transparent support post; Each luminescence unit comprises a LGP, and first side that below said diffusion sheet, is positioned at LGP is provided with second printed circuit board, is provided with second light emitting source more than between this second printed circuit board and the said LGP; Second side of the said LGP corresponding with first side is provided with the 3rd printed circuit board, is provided with the 3rd light emitting source more than between the 3rd printed circuit board and the said LGP.
A kind of liquid crystal display provided by the invention; Comprise display panels and back lighting device; Back lighting device comprises housing; Be provided with blooming piece and reflector plate in this housing, be provided with the luminescence unit that is distributed in more than on the same plane between inherent blooming piece of said housing and the reflector plate, be provided with first printed circuit board between adjacent two luminescence units; This first printed circuit board is provided with first light emitting source more than; Said first light emitting source top is provided with the diffusion sheet that covers zone between the said luminescence unit, and this diffusion sheet is fixed on the said housing through a transparent support post, and each luminescence unit comprises a LGP; First side that below said diffusion sheet, is positioned at LGP is provided with second printed circuit board; Be provided with second light emitting source more than between this second printed circuit board and the said LGP, second side of the said LGP corresponding with first side is provided with the 3rd printed circuit board, is provided with the 3rd light emitting source more than between the 3rd printed circuit board and the said LGP.
Wherein, the coverage of above-mentioned diffusion sheet only comprises: said first light emitting source, be arranged in second light emitting source and the 3rd light emitting source that is arranged in the luminescence unit on the said first light emitting source right side of the luminescence unit in said first light emitting source left side.
In the back lighting device that the embodiment of the invention provides, two kinds of distributed architectures of side-light type and straight-down negative are combined, comprise a plurality of luminescence units; Each luminescence unit comprises a LGP; Can traditional monoblock LGP be divided into several LGPs according to the demand of processing dimension, not receive the restriction of processing dimension; Be easy to processing and manufacturing, applicable to large-sized liquid crystal display; Each luminescence unit is according to the side-light type structure distribution, and light emitting source of straight-down negative distribution is provided with diffusion sheet above the light emitting source that straight-down negative distributes between the adjacent luminescence unit, can effectively avoid dark line between the luminescence unit, makes that the brightness of entire backlight device is even.
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
Description of drawings
Fig. 1 is the structural representation in prior art side light type LED back light source;
Fig. 2 is the structural representation of prior art direct LED backlight;
Fig. 3 is the side view of back lighting device embodiment of the present invention;
Fig. 4 is the vertical view of back lighting device shown in Figure 3 on the M-N plane;
Fig. 5 is the side view of liquid crystal display embodiment of the present invention.
Description of reference numerals:
The 101-LGP; The 102-white light LEDs; Reflectance coating at the bottom of the 103-;
The 104-diffusion sheet; The 105-blooming piece; 201-LED;
The 202-diffusion sheet; Reflectance coating at the bottom of the 203-; The 204-blooming piece;
The 300-luminescence unit; The 301-housing; 302-the one PCB;
303-first light emitting source; The 304-diffusion sheet; The 305-support column;
The 306-LGP; 307-the 2nd PCB; 308-second light emitting source;
309-the 3rd PCB; 310-the 3rd light emitting source; The 311-blooming piece;
The 312-reflector plate; The 501-display panels; The 502-back lighting device;
503-drives P.e.c..
Embodiment
As shown in Figure 3, be the side view of an embodiment of back lighting device of the present invention, Fig. 4 is a back lighting device embodiment illustrated in fig. 3 vertical view on the M-N plane.Please be simultaneously referring to Fig. 3 and Fig. 4, the back lighting device of the embodiment of the invention comprises housing 301, this housing 301 can be plastic products.Be provided with the luminescence unit 300 (shown in the frame of broken lines among Fig. 3) that is distributed in more than on the same plane in the housing 301; Be provided with a PCB302 between adjacent two luminescence units 300; The one PCB302 is provided with more than one first light emitting source, 303, the first light emitting sources, 303 Surface Mounts on a PCB302.As concrete embodiment, first light emitting source 303 can be CCFL or white light LEDs, also can be the white light LEDs that comprises red, green, blue three primary colours chip.Owing to utilize the LED of red, green, blue three primary colours chip to blend together white light LEDs, thereby its colour gamut is comparatively broad, and the utilization factor of luminous energy is high.
First light emitting source, 303 tops are provided with the diffusion sheet 304 that covers zone between the luminescence unit 300, and this diffusion sheet 304 specifically can adopt rectangular shape, is fixed on the housing 301 through a transparent support post 305.
Each luminescence unit 300 comprises a LGP 306, and as concrete embodiment, each LGP 306 can be a rectangular parallelepiped, and the LGP 306 in each luminescence unit 300 is can size consistent, relatively is easy to processing.In addition, LGP 306 is the polymetylmethacrylate goods, and also promptly: organic glass products can also be the polycarbonate goods, also promptly: engineering plastic product.
First side that below diffusion sheet 304, is positioned at LGP 306 is provided with the 2nd PCB307; Be provided with second light emitting source 308 more than between the 2nd PCB307 and the LGP 306; This second light emitting source 308 specifically can adopt white light LEDs, and Surface Mount is on the 2nd PCB307.
Second side of the LGP 306 corresponding with first side is provided with the 3rd PCB309; Be provided with the 3rd light emitting source 310 more than between the 3rd PCB309 and the LGP 306, also be provided with the blooming piece 311 that covers on all luminescence units 300 in the housing 301.This blooming piece can be diffusion sheet, brightening piece, reflective polaroid (Dual-Brightness Enhance Film, hereinafter to be referred as: DBEF) or prism film (Brightness Enhancement Film, hereinafter to be referred as: BEF) etc.Housing 301 inherent all luminescence unit 300 belows also are provided with and blooming piece 311 reflector plates 312 of the same size.
In the back lighting device that the embodiment of the invention provides, two kinds of distributed architectures of side-light type and straight-down negative are combined, comprise a plurality of luminescence units; Each luminescence unit adopts side-light type distributed architecture, can backlight be done thinly, and the LGP in the luminescence unit can be according to the demand of processing dimension; Traditional monoblock LGP is divided into several LGPs; Do not receive the restriction of processing dimension, be easy to processing and manufacturing, applicable to large-sized liquid crystal display; Each luminescence unit is according to the side-light type structure distribution, and light emitting source of straight-down negative distribution is provided with diffusion sheet above the light emitting source that straight-down negative distributes between the adjacent luminescence unit, can effectively avoid dark line between the luminescence unit, makes that the brightness of entire backlight device is even.
As shown in Figure 5, be the side view of an embodiment of liquid crystal display of the present invention, this liquid crystal display comprises display panels 501 and back lighting device 502.Wherein, display panels 501 can be formed by known multi-layer framework, and it clamps one deck liquid crystal layer by two layers of substrate.Drive P.e.c. 503 and can be engaged in display panels 501,501 controls of driving liquid crystal panel by light that back lighting device penetrated with show image.Back lighting device 502 wherein can adopt the back lighting device that provides like the above-mentioned arbitrary embodiment of the present invention.
In the back lighting device that the embodiment of the invention provides, two kinds of distributed architectures of side-light type and straight-down negative are combined, comprise a plurality of luminescence units; Each luminescence unit comprises a LGP; Can traditional monoblock LGP be divided into several LGPs according to the demand of processing dimension, not receive the restriction of processing dimension; Be easy to processing and manufacturing, applicable to large-sized liquid crystal display; Each luminescence unit is according to the side-light type structure distribution, and light emitting source of straight-down negative distribution is provided with diffusion sheet above the light emitting source that straight-down negative distributes between the adjacent luminescence unit, can effectively avoid dark line between the luminescence unit, makes that the brightness of entire backlight device is even.
It should be noted last that: above embodiment is only in order to explaining technical scheme of the present invention, but not the present invention is made restrictive sense.Although the present invention is specified with reference to above-mentioned preferred embodiment; Those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and this modification or be equal to spirit and the scope that replacement does not break away from technical scheme of the present invention.
Claims (10)
1. back lighting device; Comprise housing, be provided with blooming piece and reflector plate in this housing, it is characterized in that; Be provided with the luminescence unit that is distributed in more than on the same plane between inherent blooming piece of said housing and the reflector plate; Be provided with first printed circuit board between adjacent two luminescence units, this first printed circuit board is provided with first light emitting source more than, and said first light emitting source top is provided with the diffusion sheet that covers zone between the said luminescence unit; This diffusion sheet is fixed on the said housing through a transparent support post; Each luminescence unit comprises a LGP, and first side that below said diffusion sheet, is positioned at LGP is provided with second printed circuit board, is provided with second light emitting source more than between this second printed circuit board and the said LGP; Second side of the said LGP corresponding with first side is provided with the 3rd printed circuit board, is provided with the 3rd light emitting source more than between the 3rd printed circuit board and the said LGP; The coverage of said diffusion sheet only comprises: said first light emitting source, be arranged in second light emitting source and the 3rd light emitting source that is arranged in the luminescence unit on the said first light emitting source right side of the luminescence unit in said first light emitting source left side.
2. back lighting device according to claim 1 is characterized in that, said LGP is a rectangular parallelepiped.
3. back lighting device according to claim 1 is characterized in that, said LGP is polymetylmethacrylate goods or polycarbonate goods.
4. back lighting device according to claim 1 is characterized in that, said first light emitting source is cold cathode fluorescent tube or white light LEDs or the white light LEDs that comprises red, green, blue three primary colours chip.
5. according to any described back lighting device of claim 1 to 4, it is characterized in that said blooming piece is diffusion sheet or reflective polaroid or prism film.
6. liquid crystal display; Comprise display panels and back lighting device; Back lighting device comprises housing, is provided with blooming piece and reflector plate in this housing, it is characterized in that; Be provided with the luminescence unit that is distributed in more than on the same plane between inherent blooming piece of said housing and the reflector plate; Be provided with first printed circuit board between adjacent two luminescence units, this first printed circuit board is provided with first light emitting source more than, and said first light emitting source top is provided with the diffusion sheet that covers zone between the said luminescence unit; This diffusion sheet is fixed on the said housing through a transparent support post; Each luminescence unit comprises a LGP, and first side that below said diffusion sheet, is positioned at LGP is provided with second printed circuit board, is provided with second light emitting source more than between this second printed circuit board and the said LGP; Second side of the said LGP corresponding with first side is provided with the 3rd printed circuit board, is provided with the 3rd light emitting source more than between the 3rd printed circuit board and the said LGP; The coverage of said diffusion sheet only comprises: said first light emitting source, be arranged in second light emitting source and the 3rd light emitting source that is arranged in the luminescence unit on the said first light emitting source right side of the luminescence unit in said first light emitting source left side.
7. liquid crystal display according to claim 6 is characterized in that, said LGP is a rectangular parallelepiped.
8. liquid crystal display according to claim 6 is characterized in that, said LGP is polymetylmethacrylate goods or polycarbonate goods.
9. liquid crystal display according to claim 6 is characterized in that, said first light emitting source is cold cathode fluorescent tube or white light LEDs or the white light LEDs that comprises red, green, blue three primary colours chip.
10. according to any described liquid crystal display of claim 6 to 9, it is characterized in that said blooming piece is diffusion sheet or reflective polaroid or prism film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101174024A CN101324725B (en) | 2008-07-30 | 2008-07-30 | LCD device and backlight device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101174024A CN101324725B (en) | 2008-07-30 | 2008-07-30 | LCD device and backlight device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101324725A CN101324725A (en) | 2008-12-17 |
| CN101324725B true CN101324725B (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101174024A Active CN101324725B (en) | 2008-07-30 | 2008-07-30 | LCD device and backlight device |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130239B (en) * | 2011-01-31 | 2012-11-07 | 郑榕彬 | Omnibearing lighting LED (light-emitting diode) packaging method and LED packaging part |
| CN102128398B (en) * | 2011-03-21 | 2013-05-01 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display device |
| KR101767973B1 (en) | 2011-08-16 | 2017-08-16 | 삼성디스플레이 주식회사 | Backlight assembly |
| CN202253209U (en) * | 2011-10-14 | 2012-05-30 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display with same |
| CN103075676B (en) * | 2011-10-26 | 2015-05-13 | 乐金显示有限公司 | Back light unit, method of manufacturing the same and liquid crystal display device including the same |
| CN102865511A (en) * | 2012-09-14 | 2013-01-09 | 深圳市华星光电技术有限公司 | Direct type backlight module |
| TWI504992B (en) * | 2013-04-12 | 2015-10-21 | Au Optronics Corp | Backlight unit for multiple-display device |
| CN103759175B (en) * | 2014-01-21 | 2016-03-30 | 北京京东方显示技术有限公司 | A kind of backlight and display device |
| CN111367122A (en) * | 2020-04-03 | 2020-07-03 | 深圳市隆利科技股份有限公司 | Light guide LED lamp panel |
| CN111489705B (en) * | 2020-04-14 | 2023-05-09 | 深圳市隆利科技股份有限公司 | Method for image partition display |
| CN111487810A (en) * | 2020-04-21 | 2020-08-04 | 深圳市隆利科技股份有限公司 | Area light source backlight module |
| CN113608380B (en) * | 2021-07-30 | 2022-09-27 | 惠科股份有限公司 | Double-sided display panel, display device and driving method |
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2008
- 2008-07-30 CN CN2008101174024A patent/CN101324725B/en active Active
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| CN101324725A (en) | 2008-12-17 |
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