CN1301434C - Double-sided backlight assembly and liquid crystal display device - Google Patents
Double-sided backlight assembly and liquid crystal display device Download PDFInfo
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- CN1301434C CN1301434C CNB031430716A CN03143071A CN1301434C CN 1301434 C CN1301434 C CN 1301434C CN B031430716 A CNB031430716 A CN B031430716A CN 03143071 A CN03143071 A CN 03143071A CN 1301434 C CN1301434 C CN 1301434C
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- backlight assembly
- liquid crystal
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Abstract
A double-sided backlight assembly and a liquid crystal display device are provided. The double-sided liquid crystal display device comprises a double-sided backlight assembly and two liquid crystal panels which are respectively arranged on the outer sides of the double-sided backlight assembly in parallel. The double-sided backlight assembly comprises a plurality of light sources, a plurality of light reflection assemblies arranged between the light sources, two diffusion sheets arranged on two sides of the light sources in parallel, two prism sheets arranged on the outer sides of the diffusion sheets in parallel, and two protective diffusion sheets arranged on the outer sides of the prism sheets in parallel. In addition, the double-sided backlight assembly can be wrapped between the liquid crystal panels by an outer frame.
Description
Technical field
The invention relates to a kind of two plane type backlight assembly and liquid crystal indicator, be particularly to a kind of double-sided LCD device that uses two-sided direct type backlight assembly.
Background technology
Along with the evolution of display technology, display device produces various new-type display device from continuous differentiation of traditional cathode ray tube (CRT).Wherein, advantages such as that liquid crystal indicator (LCD) possesses is frivolous, power saving, low radiation, therefore become one of common now display device gradually, can be widely used among communication, information or the consumption electronic products such as mobile computer, digital camera, Video Camera, mobile phone.
Liquid crystal indicator mainly is to show with a liquid crystal panel (LCD panel), because liquid crystal panel itself can't be luminous, therefore must supply the light source that brightness is abundant and be evenly distributed, and makes normally show image of liquid crystal panel.The function of this supply light source is promptly undertaken by (backlight) backlight assembly.Backlight assembly can be according to the difference of its structure, and is divided into two kinds of side-light type backlight assembly and straight-down negative (or claiming flat) backlight assemblies.The side-light type backlight assembly only adopts single tubes or the fluorescent tube more than two as light source usually, utilizes light guide plate design to strengthen control to light going direction, yet because light going direction control is difficult for, so display effect is relatively poor usually.Comparatively speaking, the design of direct type backlight assembly is that the fluorescent tube as light source is placed under the backlight assembly, because of accommodation space becomes big, thus can use the fluorescent tube more than two to increase the intensity of light source, thereby be applicable to portable and the more not fastidious general LCD of space requirement.
Referring to Fig. 1, show the structure of the liquid crystal indicator 100 of a known use direct type backlight assembly.This known liquid crystal indicator 100 has a liquid crystal panel 110, housing 170 and its inner direct type backlight assembly, comprising: protection diffusion sheet 120, prismatic lens 130, diffusion sheet 140, the fluorescent tube 150 as light source, reflector plate 160 and light modulation site 145.
(ColdCathode Fluorescent Lamp is CCFL) as fluorescent tube (light source) 150 for the cold cathode fluorescent lamp of the general normal use low-pressure mercury fluorescent light design of direct type backlight assembly.The principle of luminosity of cold cathode fluorescent lamp is quite similar with general daylight lamp, is to utilize field effect excited inert gas atom and mercury atom collision to disengage the ultraviolet light of low wavelength, through after being coated on the fluorophor of lamp tube wall, just can be converted into visible light.
The effect of reflector plate 160 is that the light that fluorescent tube 150 is sent is reflected to diffusion sheet 140, to improve the light utilization ratio of fluorescent tube 150.The effect of the inboard diffusion sheet 140 and the protection diffusion sheet 120 in the outside is light scatter, to adjust the uniformity coefficient of light.The main effect of prismatic lens 130 (being also referred to as concentration piece) then is optically focused, to increase the brightness that backlight assembly was produced.145 of light modulation sites mainly are to adjust the brightness and the uniformity coefficient of light.
Yet, the shortcoming of above-mentioned liquid crystal indicator 100 is: though the light of fluorescent tube 150 is scatterings to all the winds, but because liquid crystal panel 110 only is positioned at a side of liquid crystal indicator 100, therefore fluorescent tube 150 is to the light of back side institute scattering, only can reflect, can reach as the function that shows with light by reflector plate 160; So not only using liquid crystal indicator 100 to consume the light utilization ratio, and the single face Presentation Function can only be provided, and underusing light at the light reflex time.
Summary of the invention
In view of this, a purpose of the present invention is to propose a kind of two plane type backlight assembly and liquid crystal indicator, change the direct type backlight assembly of script one plane type into the two plane type backlight assembly, make same backlight assembly can supply double-edged liquid crystal panel utilization, not only display frame simultaneously, and the light utilization ratio of backlight assembly is more improved.
The present invention discloses a kind of two plane type backlight assembly, has a plurality of light sources, is arranged at a plurality of smooth reflection subassembly between the light source, two prismatic lenses that are set in parallel in two diffusion sheets of light source both sides and are set in parallel in the diffusion sheet outside.
In above-mentioned two plane type backlight assembly, also can include two protection diffusion sheets that are set in parallel in the prismatic lens outside.
In addition, the present invention discloses a kind of double-sided LCD device.This double-sided LCD device has a two plane type backlight assembly and two liquid crystal panels, is set in parallel in the outside of this two plane type backlight assembly respectively.Wherein, the two plane type backlight assembly comprise a plurality of light sources, be arranged at a plurality of smooth reflection subassembly between the light source, be set in parallel in two diffusion sheets of light source both sides, two protection diffusion sheets that are set in parallel in two prismatic lenses in the diffusion sheet outside and are set in parallel in the prismatic lens outside.In addition, can the two plane type backlight assembly be coated between the liquid crystal panel by a housing.
In two plane type backlight assembly of the present invention and the liquid crystal indicator, light source can adopt general common cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp, CCFL) or EEFL (External electrodefluorescent lamp).
Description of drawings
Fig. 1 is the synoptic diagram of the liquid crystal indicator of known use direct type backlight assembly.
Fig. 2 is the synoptic diagram of the double-sided LCD device of first embodiment of the invention.
Fig. 3 is the synoptic diagram of the double-sided LCD device of second embodiment of the invention.
Fig. 4 is the synoptic diagram of light source and light reflection subassembly among second embodiment.
Symbol description:
1～liquid crystal indicator;
10～liquid crystal panel;
20～diffusion sheet;
30～prismatic lens;
40～scatter plate;
50～fluorescent tube (light source);
60～inside casing;
70～housing;
80～light reflection subassembly;
100～liquid crystal indicator;
110～liquid crystal panel;
120～diffusion sheet; 130～prismatic lens; 140～scatter plate;
145～light modulation site;
150～fluorescent tube;
160～reflecting plate;
170～housing.For above and other objects of the present invention, feature and advantage can be become apparent, several concrete preferred embodiments cited below particularly, and conjunction with figs. elaborates.
Embodiment
For above and other objects of the present invention, feature and advantage can be become apparent, several concrete preferred embodiments cited below particularly, and elaborate in conjunction with the accompanying drawings.
Below for two example two, in order to two plane type back of the body assembly of the present invention and liquid crystal indicator to be described.
First embodiment
Referring to Fig. 2, the two plane type backlight assembly and the liquid crystal indicator of first embodiment of the invention is described.The double-sided LCD device 1 of present embodiment is to have two liquid crystal panels 10, is set in parallel in the outside of a two plane type backlight assembly respectively.The two plane type backlight assembly comprises: 50, two diffusion sheets of a plurality of fluorescent tubes (light source) 40, two prismatic lenses 30 and two protection diffusion sheets 20.In addition, can the two plane type backlight assembly be coated between the liquid crystal panel 10, and housing 70 inboards have an inside casing 60 respectively, in order to fixed double-sided formula backlight assembly by a housing 70.
In the present embodiment, (Cold Cathode Fluorescent Lamp is CCFL) as fluorescent tube (light source) 50 to be to use cold cathode fluorescent lamp.Diffusion sheet 40 is the both sides that are set in parallel in fluorescent tube 50 respectively; Prismatic lens 30 is the outsides that are set in parallel in diffusion sheet 40 respectively; 20 of diffusion sheets of protection are the outsides that is set in parallel in prismatic lens 30 respectively.The function of diffusion sheet 40, prismatic lens 30 and protection diffusion sheet 20 is narrated in known technology, in this explanation no longer separately.
So, the light by same two plane type backlight assembly is sent can provide light simultaneously to the liquid crystal panel 10 of both sides, and not only display frame simultaneously also can make the light utilization ratio of backlight assembly more improve.
Second embodiment
Referring to Fig. 3, the two plane type backlight assembly and the liquid crystal indicator of second embodiment of the invention is described.The double-sided LCD device 1 of present embodiment ' be to have two liquid crystal panels 10, be set in parallel in the outside of a two plane type backlight assembly respectively.The two plane type backlight assembly comprises: a plurality of fluorescent tubes (light source) 50, a plurality of smooth reflection subassembly 80, two diffusion sheets 40, two prismatic lenses 30 and two protection diffusion sheets 20.In addition, can the two plane type backlight assembly be coated between the liquid crystal panel 10, and housing 70 inboards have an inside casing 60 respectively, in order to fixed double-sided formula backlight assembly by a housing 70.
In the present embodiment, (Cold Cathode Fluorescent Lamp is CCFL) as fluorescent tube (light source) 50 to be to use cold cathode fluorescent lamp.Diffusion sheet 40 is the both sides that are set in parallel in fluorescent tube 50 respectively; Prismatic lens 30 is the outsides that are set in parallel in diffusion sheet 40 respectively; 20 of diffusion sheets of protection are the outsides that is set in parallel in prismatic lens 30 respectively.The function of diffusion sheet 40, prismatic lens 30 and protection diffusion sheet 20 is narrated in known technology, in this explanation no longer separately.
The purpose of light reflection subassembly 80 is to be the light of fluorescent tube 50 is reflexed to diffusion sheet, with further raising light utilization ratio.During fabrication, can determine the distribution and the utilization ratio of light by the physical dimension and the surface reflectance of control light reflection subassembly 80.
So, the light by same two plane type backlight assembly is sent just can provide light simultaneously to the liquid crystal panel 10 of both sides, and not only display frame simultaneously also can make the light utilization ratio of backlight assembly more improve.
Though the present invention with concrete preferred embodiment openly as above; yet it is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; still can do a little change and retouching, so protection scope of the present invention is worked as with being as the criterion that claims were defined.
Claims (5)
1. two plane type backlight assembly comprises:
A plurality of light sources;
A plurality of light reflection subassemblies that are arranged at respectively between described a plurality of light source;
Two diffusion sheets that are set in parallel in the both sides of described a plurality of light sources respectively;
Two prismatic lenses that are set in parallel in the outside of described two diffusion sheets respectively; And
Two protection diffusion sheets that are set in parallel in the outside of described two prismatic lenses respectively.
2. two plane type backlight assembly as claimed in claim 1 is characterized in that: described a plurality of light sources are cold cathode fluorescent lamp.
3. double-sided LCD device comprises:
One two plane type backlight assembly; And
Two liquid crystal panels that are set in parallel in the outside of this two plane type backlight assembly respectively;
Wherein, this two plane type backlight assembly comprises:
A plurality of light sources;
A plurality of light reflection subassemblies that are arranged at respectively between described a plurality of light source;
Two diffusion sheets that are set in parallel in the both sides of described a plurality of light sources respectively;
Two prismatic lenses that are set in parallel in the outside of described two diffusion sheets respectively; And
Two protection diffusion sheets that are set in parallel in the outside of described two prismatic lenses respectively.
4. double-sided LCD device as claimed in claim 3 is characterized in that: the housing that also has this two plane type backlight assembly of coating.
5. double-sided LCD device as claimed in claim 3 is characterized in that: described light source is a cold cathode fluorescent lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031430716A CN1301434C (en) | 2003-06-18 | 2003-06-18 | Double-sided backlight assembly and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031430716A CN1301434C (en) | 2003-06-18 | 2003-06-18 | Double-sided backlight assembly and liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1567057A CN1567057A (en) | 2005-01-19 |
| CN1301434C true CN1301434C (en) | 2007-02-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031430716A Expired - Lifetime CN1301434C (en) | 2003-06-18 | 2003-06-18 | Double-sided backlight assembly and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1301434C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI421586B (en) | 2009-01-06 | 2014-01-01 | Au Optronics Corp | Backlight module and double-sided liquid crystal display device |
| TWI459078B (en) * | 2011-12-02 | 2014-11-01 | Au Optronics Corp | Double-sided display and frame thereof |
| CN105676533A (en) * | 2016-03-30 | 2016-06-15 | 合肥惠科金扬科技有限公司 | Double-sided light-emitting backlight module and display device |
| CN107728383A (en) * | 2017-11-30 | 2018-02-23 | 武汉华星光电技术有限公司 | Double-side display device and its display module |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0990325A (en) * | 1995-09-26 | 1997-04-04 | Toshiba Corp | Liquid crystal display |
| JP2000338483A (en) * | 1999-05-31 | 2000-12-08 | Nec Home Electronics Ltd | Liquid crystal display |
| JP2000340019A (en) * | 1999-05-31 | 2000-12-08 | Nec Home Electronics Ltd | Backlight device |
| CN1356584A (en) * | 2000-11-25 | 2002-07-03 | 现代显示器科技公司 | Both-surface light output type back lighting part for LCD |
| CN1534353A (en) * | 2003-03-27 | 2004-10-06 | Nec液晶技术株式会社 | Backlight device and liquid crystal display device |
-
2003
- 2003-06-18 CN CNB031430716A patent/CN1301434C/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0990325A (en) * | 1995-09-26 | 1997-04-04 | Toshiba Corp | Liquid crystal display |
| JP2000338483A (en) * | 1999-05-31 | 2000-12-08 | Nec Home Electronics Ltd | Liquid crystal display |
| JP2000340019A (en) * | 1999-05-31 | 2000-12-08 | Nec Home Electronics Ltd | Backlight device |
| CN1356584A (en) * | 2000-11-25 | 2002-07-03 | 现代显示器科技公司 | Both-surface light output type back lighting part for LCD |
| CN1534353A (en) * | 2003-03-27 | 2004-10-06 | Nec液晶技术株式会社 | Backlight device and liquid crystal display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1567057A (en) | 2005-01-19 |
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