CN100335953C - Directly-down backlight assembly and liquid crystal display device - Google Patents
Directly-down backlight assembly and liquid crystal display device Download PDFInfo
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- CN100335953C CN100335953C CNB2004100420714A CN200410042071A CN100335953C CN 100335953 C CN100335953 C CN 100335953C CN B2004100420714 A CNB2004100420714 A CN B2004100420714A CN 200410042071 A CN200410042071 A CN 200410042071A CN 100335953 C CN100335953 C CN 100335953C
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- liquid crystal
- backlight assembly
- type backlight
- light source
- direct type
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 40
- 238000010586 diagram Methods 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- 238000002310 reflectometry Methods 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 201000009240 nasopharyngitis Diseases 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The present invention relates to a directly-down type backlight subassembly and a liquid crystal display device. The directly-down type backlight subassembly is provided with a reflecting plate, at least one light source and a plurality of transparent supporting frames, wherein one side of the reflecting plate is provided with an opening, the light source is arranged at the bottom of the reflecting plate in parallel, and the transparent supporting frame is arranged at both ends of the light source and is used for fixing the light source. Thus, light emitted from both sides of the light source can be reflected and transmitted all right, the light utilization ratio is increased, and the display brightness of both sides of a liquid crystal panel of the liquid crystal display device is maintained.
Description
Technical field
The present invention is relevant for a kind of direct type backlight assembly and liquid crystal indicator.
Background technology
Along with the evolution of display technology, display device produces various new-type display device from the continuous evolution of traditional cathode ray tube (CRT).Wherein, advantages such as that liquid crystal indicator (LCD) has is frivolous, power saving, low radiation, therefore become one of common now display device gradually, can be widely used in communication, information or consumption electronic products such as notebook computer, digital camera, Video Camera, mobile phone in.
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.In addition, liquid crystal panel uses a housing that it is covered with after backlight assembly combines usually, with the assembly of protection liquid crystal panel and backlight assembly.
The side-light type backlight assembly is arranged on the side of backlight assembly with light source, 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.Compare, the design of direct type backlight assembly will place as the fluorescent tube of light source 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 portability and the more not fastidious general LCD of space requirement.
Referring to Fig. 1, show the structure of a known direct type backlight assembly.The shown known direct type backlight assembly of Fig. 1 has a reflecting plate 10, a light diffusing sheet 20, as fluorescent tube 30 and a plurality of bracing frame 40 of light source.In addition, may also be provided with other not blooming piece of icon in the general direct type backlight assembly, for example prismatic lens, protection diffusion sheet etc. to improve its light utilization or to promote its diffusivity, do not specify at this.
Among Fig. 1, reflecting plate 10 is a concave character type, and its inboard is the higher surface of reflectivity, and improving reflectivity, and a side up has an opening, and light is penetrated.Light diffusing sheet 20 is set in parallel in the opening part of reflecting plate 10, and with so that further diffusion and full and uniform utilization of light, fluorescent tube (light source) 30 then can be provided with one or many on demand, is set in parallel in reflecting plate 10 bottoms, so that light to be provided.(Cold CathodeFluorescent Lamp is CCFL) as fluorescent tube (light source) 30 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 sight lamp, utilizes the collision of field effect excited inert gas atom and mercury atom to disengage short wavelength's ultraviolet light, through after coating the fluorophor of lamp tube wall, just can be converted into visible light.
In addition, among Fig. 1, bracing frame 40 is arranged at fluorescent tube (light source) 30 two ends, and its angle and reflecting plate 10 are orthogonal, uses so that fluorescent tube 30 and reflecting plate 10 relative fixed can or not collide because of carrying and make its relative position change or generation splintering problem.
Yet, the structure of the known direct type backlight assembly of above-mentioned Fig. 1, in practical application, because bracing frame 40 is orthogonal with reflecting plate 10, therefore can cause the whole cross section of bracing frame 40 to stop the light that fluorescent tube 30 upwards penetrates fully, and make and the light luminance deficiency of bracing frame 40 area just above reduce its light utilization.Use the liquid crystal indicator of this direct type backlight assembly, its liquid crystal panel can be obviously low than other regional luminance when showing corresponding to the zone of bracing frame, makes and whole image light and shade inequality the user is caused discomfort easily.
Therefore, the existing structure that is improved at this problem occurs in the known technology.Referring to Fig. 2, show the structure-improved of a known direct type backlight assembly.Shown its structure of known direct type backlight assembly and the Fig. 1 of Fig. 2 is similar, has a reflecting plate 10, a light diffusing sheet 20 equally, as fluorescent tube 30 and a plurality of bracing frame 40 of light source.Its difference is that the bracing frame 40 among Fig. 2 is not vertical with reflecting plate 10 as shown in Figure 1, but adopt white high reflecting material, effect with cremasteric reflex, and be the inclination of a θ angle with reflecting plate 10, for example 50 °～70 °, can make that so the volume of direct type backlight assembly is less relatively, and can save power supply.
Yet, the structure of the known direct type backlight assembly of above-mentioned Fig. 2, in practical application, because bracing frame 40 white high reflecting materials, light can't see through, and therefore for the emitted light in fluorescent tube 30 both sides beyond the bracing frame 40, still can produce the problem of covering, and making the light luminance deficiency of both sides, it is still limited that its light utilization improves effect.Use the liquid crystal indicator of this direct type backlight assembly, its liquid crystal panel two side areas can be obviously low than middle section brightness when showing, makes and whole image light and shade inequality the user is still caused discomfort easily.
Summary of the invention
In view of this, a purpose of the present invention promptly is to propose a kind of direct type backlight assembly and is improved at the problem of light utilization deficiency in the known direct type backlight assembly, so that the light of fluorescent tube (light source) both sides can make full use of, improves light utilization.
Another object of the present invention is to propose a kind of directly-down liquid crystal display screen, use the direct type backlight assembly after the above-mentioned improvement, so can be by the raising of light utilization, reduce the darker problem of brightness of liquid crystal panel both sides in the known LCD Panel, and can shorten fluorescent tube length relatively, to improve the space utilization degree as light source.
The present invention discloses a kind of direct type backlight assembly, has reflecting plate, at least one light source and a plurality of transparent support frame.One side of reflecting plate has an opening; Light source then is set in parallel in the reflecting plate bottom.Transparent support is set up and is placed the light source two ends, and in order to fixed light source, so light good reflection and transmission that the light source both sides are sent improves light utilization.
In addition, the present invention also discloses a kind of directly-down liquid crystal display device, have a liquid crystal panel and aforesaid direct type backlight assembly, and can use a housing covering liquid crystal panel and a direct type backlight assembly, so can keep the display brightness of liquid crystal panel both sides.
In direct 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).
For above-mentioned and other purpose of the present invention, feature and advantage can be become apparent, concrete preferred embodiment cited below particularly, and elaborate in conjunction with the accompanying drawings.
Description of drawings
Fig. 1 is the synoptic diagram that shows known direct type backlight assembly structure.
Fig. 2 is the synoptic diagram that shows another known direct type backlight assembly structure.
Fig. 3 is the synoptic diagram that shows the direct type backlight assembly structure of one embodiment of the invention.
Fig. 4 is the synoptic diagram that shows the direct type backlight assembly structure of one embodiment of the invention.
Fig. 5 is the synoptic diagram that shows the direct type backlight assembly structure of one embodiment of the invention.
The reference numeral explanation:
10～reflecting plate;
20～diffuser plate;
30～fluorescent tube (light source);
40,40a, 40b～bracing frame.
Embodiment
Below referring to Fig. 3, with a preferred embodiment direct type backlight assembly of the present invention and liquid crystal indicator are described.In this mandatory declaration, the explanation of present embodiment and graphic be not in order to limit liquid crystal indicator of the present invention; Change speech, protection scope of the present invention should with accompanying claim the person of being defined be as the criterion.
Fig. 3 is the direct type backlight assembly that shows one embodiment of the invention.The direct type backlight assembly of present embodiment, the known direct type backlight assembly of its structure and Fig. 1 or Fig. 2 is similar, has a reflecting plate 10, a light diffusing sheet 20 equally, as the fluorescent tube 30 of light source; Yet in the present embodiment, bracing frame adopts transparent support frame 40.Reflecting plate 10 is a concave character type, and its inboard is the higher surface of reflectivity, and improving reflectivity, and a side up has an opening, and light is penetrated.Light diffusing sheet 20 is set in parallel in the opening part of reflecting plate 10, and with so that further diffusion and full and uniform utilization of light, fluorescent tube (light source) 30 then can be provided with one or many on demand, is set in parallel in reflecting plate 10 bottoms, so that light to be provided.(Cold CathodeFluorescent Lamp is CCFL) as fluorescent tube (light source) 30 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, utilizes the collision of field effect excited inert gas atom and mercury atom to disengage the ultraviolet light of low wavelength, through after coating the fluorophor of lamp tube wall, just can be converted into visible light.In addition, transparent support frame 40 is arranged at fluorescent tube (light source) 30 two ends, uses so that fluorescent tube 30 and reflecting plate 10 relative fixed can or not collide because of carrying and make its relative position change or generation splintering problem.
The difference of present embodiment and known direct type backlight assembly is that the transparent support frame 40 among Fig. 3 adopts transparent material, makes light can directly penetrate transparent support frame 40.So, the emitted light in fluorescent tube 30 both sides beyond the transparent support frame 40, major part can directly penetrate transparent support frame 40, thereby can not produce the problem of covering, and therefore can effectively improve light utilization; And because of bracing frame 40 is transparent,, so can make the distance of light penetration transparent support frame 40 reduce relatively, and the volume that can reach direct type backlight assembly equally reduces, and can save the purpose of power supply so can be at any angle to tilt with reflecting plate 10.
The liquid crystal indicator that uses the direct type backlight assembly of present embodiment to make combines liquid crystal panel with direct type backlight assembly shown in Figure 3, and with a housing covering liquid crystal panel and direct type backlight assembly and fixing.So, the two side areas of its liquid crystal panel does not have the obviously phenomenon low than middle section brightness when showing, can make that so the uniformity of brightness of whole image is preferable, can make visual effect comparatively comfortable for the user.
Must specify at this, in the direct type backlight assembly of the present invention, can be provided with other not blooming piece of icon, for example prismatic lens, protection diffusion sheet etc. are with its light utilization of further raising or promote its diffusivity.In addition, transparent support frame 40 can be an Any shape, for example linearity bracing frame 40 shown in Fig. 3 or circular-arc bracing frame 40b as shown in Figure 4, the bracing frame 40a that constitutes with the multistage straight line as shown in Figure 5, or any other straight line or curve combination and random geometry of forming or the like.
Function of the present invention is material and its angle of inclination by the improvement bracing frame, and the light of fluorescent tube (light source) both sides can be made full use of, and improves light utilization.Simultaneously, raising by light utilization, can improve the uniformity of brightness of liquid crystal panel in the LCD Panel, and can shorten fluorescent tube length relatively as light source, to improve the space utilization degree, make the volume miniaturization, increase carrying and the convenience that carries, can more be applicable in the devices such as the notebook computer carried or PDA.
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 some the change and the retouching of permission, so protection scope of the present invention should be with being as the criterion that claims scope is defined.
Claims (10)
1. direct type backlight assembly comprises:
One reflecting plate;
At least one light source, this light source be arranged in parallel with respect to this reflecting plate; And
A plurality of transparent support framves, these transparent support set up and place this reflecting plate in order to fix this light source two ends.
2. direct type backlight assembly as claimed in claim 1 is characterized in that: these transparent support are put up linearity.
3. direct type backlight assembly as claimed in claim 1 is characterized in that: these transparent support are put up circular-arc.
4. direct type backlight assembly as claimed in claim 1 is characterized in that: these transparent support framves are by the multistage rectilinear(-al).
5. direct type backlight assembly as claimed in claim 1 is characterized in that: these light sources are cold cathode fluorescent lamp.
6. directly-down liquid crystal display device comprises:
One liquid crystal panel;
One direct type backlight assembly, this direct type backlight assembly comprises:
One reflecting plate is arranged at a side of this liquid crystal panel;
At least one light source, this light source are set in parallel between this reflecting plate and this liquid crystal panel; And
A plurality of transparent support framves, these transparent support set up and place this reflecting plate in order to fix this light source two ends; And
One housing, this housing coat this liquid crystal panel and this direct type backlight assembly.
7. directly-down liquid crystal display device as claimed in claim 6 is characterized in that: these transparent support are put up linearity.
8. directly-down liquid crystal display device as claimed in claim 6 is characterized in that: these transparent support are put up circular-arc.
9. directly-down liquid crystal display device as claimed in claim 6 is characterized in that: these transparent support framves are by the multistage rectilinear(-al).
10. directly-down liquid crystal display device as claimed in claim 6 is characterized in that: these light sources are cold cathode fluorescent lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100420714A CN100335953C (en) | 2004-04-30 | 2004-04-30 | Directly-down backlight assembly and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100420714A CN100335953C (en) | 2004-04-30 | 2004-04-30 | Directly-down backlight assembly and liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1570731A CN1570731A (en) | 2005-01-26 |
| CN100335953C true CN100335953C (en) | 2007-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100420714A Expired - Fee Related CN100335953C (en) | 2004-04-30 | 2004-04-30 | Directly-down backlight assembly and liquid crystal display device |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100637220B1 (en) * | 2005-03-18 | 2006-10-20 | 삼성에스디아이 주식회사 | Display apparatus of shining around indirectly |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030090901A1 (en) * | 2001-11-09 | 2003-05-15 | Lg. Philips Lcd Co., Ltd. | Direct-type back light device and method of manufacturing the same |
| CN1444074A (en) * | 2002-03-12 | 2003-09-24 | 友达光电股份有限公司 | Backlight device and its liquid crystal display device |
| CN1467548A (en) * | 2002-06-05 | 2004-01-14 | ���ǵ�����ʽ���� | Backlight assembly and liquid crystal display apparatus |
| CN1467550A (en) * | 2002-07-11 | 2004-01-14 | 三星电子株式会社 | Backlight assembly and liquid crystal display apparatus having the same |
| CN1467547A (en) * | 2002-06-26 | 2004-01-14 | ���ǵ�����ʽ���� | Backlight assembly and liquid crystal display apparatus having the same |
| US20040032725A1 (en) * | 2002-08-16 | 2004-02-19 | Chin-Kun Hsieh | Direct-type backlight unit for flat panel liquid crystal displays |
-
2004
- 2004-04-30 CN CNB2004100420714A patent/CN100335953C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030090901A1 (en) * | 2001-11-09 | 2003-05-15 | Lg. Philips Lcd Co., Ltd. | Direct-type back light device and method of manufacturing the same |
| CN1444074A (en) * | 2002-03-12 | 2003-09-24 | 友达光电股份有限公司 | Backlight device and its liquid crystal display device |
| CN1467548A (en) * | 2002-06-05 | 2004-01-14 | ���ǵ�����ʽ���� | Backlight assembly and liquid crystal display apparatus |
| CN1467547A (en) * | 2002-06-26 | 2004-01-14 | ���ǵ�����ʽ���� | Backlight assembly and liquid crystal display apparatus having the same |
| CN1467550A (en) * | 2002-07-11 | 2004-01-14 | 三星电子株式会社 | Backlight assembly and liquid crystal display apparatus having the same |
| US20040032725A1 (en) * | 2002-08-16 | 2004-02-19 | Chin-Kun Hsieh | Direct-type backlight unit for flat panel liquid crystal displays |
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| Publication number | Publication date |
|---|---|
| CN1570731A (en) | 2005-01-26 |
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