CN103148414A - Back light unit and display device - Google Patents
Back light unit and display device Download PDFInfo
- Publication number
- CN103148414A CN103148414A CN2013100604295A CN201310060429A CN103148414A CN 103148414 A CN103148414 A CN 103148414A CN 2013100604295 A CN2013100604295 A CN 2013100604295A CN 201310060429 A CN201310060429 A CN 201310060429A CN 103148414 A CN103148414 A CN 103148414A
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- lgp
- ccfl40
- backlight module
- ccfl
- distance
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0091—Positioning aspects of the light source relative to the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention provides a back light unit and a display device, relates to the field of display technology and can solve the problem of nonuniform brightness of a conventional backlight module. The back light unit comprises a light guide plate and CCFLs (Cold Cathode Fluorescent Lamps) arranged on at least one side surface of the light guide plate, wherein the distance between two ends of the CCFLs and the light guide plate is smaller than that between the middles of the CCFLs and the light guide plate.
Description
Technical field
The present invention relates to the Display Technique field, relate in particular to a kind of backlight module and display unit.
Background technology
Backlight module is that liquid crystal indicator (Liquid Crystal Display is called for short LCD) provides light source, is the important composition parts of LCD.Have technical maturity, steady performance in view of cathode fluorescent tube (Cold Cathode Fluorescent Lamp is called for short CCFL) in prior art, generally select CCFL as the luminescent device in backlight module.In order to reduce the thickness of LCD, at present, preferably luminescent device is arranged on the side of backlight module.
As shown in Figure 1, structural representation for existing CCFL side entrance back module, this backlight module comprises: end reflector plate 10, be arranged on the LGP 20 on end reflector plate, be arranged on the blooming piece 30 of LGP top, be arranged on the CCFL40 of at least one side of LGP, and in order to improve the luminous efficiency of CCFL40, be arranged on the lampshade 50 around CCFL40 so that the light that CCFL40 launches all is transmitted into LGP 20 inside.
In the structure of existing CCFL side entrance back module, CCFL40 is designed to straight lamp tube, and LGP 20 is identical along thickness on the length direction of CCFL, yet because the luminous efficiency at CCFL centre position and two ends is different, therefore in the situation that LGP adopts same thickness, the middle part of LGP exiting surface is different with two ends brightness, causes backlight module the bad phenomenon of brightness homogeneity to occur.
Summary of the invention
Embodiments of the invention provide a kind of backlight module and display unit, can improve the problem of the brightness disproportionation of backlight module.
For achieving the above object, embodiments of the invention adopt following technical scheme:
On the one hand, provide a kind of backlight module, having comprised: LGP is arranged at the CCFL of at least one side of described LGP; Wherein, the distance of described LGP is arrived to the distance of described LGP in the two ends of described CCFL less than the centre position of described CCFL.
Preferably, described CCFL's is shaped as arc.
Further, the two ends of described CCFL equate to the distance of described LGP.
Preferably, along on the length direction of described CCFL, the thickness of described LGP is increased progressively to two ends by the centre position.
Preferably, described backlight module also comprises: be around in described CCFL lampshade on every side.
Further preferred, described lampshade is U-shaped.
Preferably, described lampshade is provided with the reflecting layer near the face of described CCFL or described lampshade is the reflectivity lampshade.
Optionally, described backlight module also comprises: the end reflector plate that is arranged at described LGP below.
Optionally, described backlight module also comprises: the blooming piece that is arranged at described LGP top.
On the one hand, provide a kind of display unit, having comprised: above-mentioned backlight module.
The embodiment of the present invention provides a kind of backlight module and display unit, described backlight module comprises LGP, be arranged at the CCFL of described LGP side, the distance of described LGP is arrived to the distance of described LGP in the two ends of described CCFL less than the centre position of described CCFL; Make so the two ends of described CCFL and the Distance Shortened between LGP, thereby improve the brightness at backlight module two ends, and then improve the homogeneity of the brightness of backlight module.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of backlight module in prior art;
Fig. 2 is the structural representation of CCFL in prior art;
The brightness of the CCFL that Fig. 3 provides for the embodiment of the present invention and the relation curve schematic diagram of length;
The CCFL that Fig. 4 provides for the embodiment of the present invention is to the distance of LGP and the relation curve schematic diagram of the brightness of CCFL;
The structural representation of a kind of backlight module that Fig. 5 provides for the embodiment of the present invention one;
The structural representation of a kind of backlight module that Fig. 6 provides for the embodiment of the present invention two;
A kind of schematic diagram for calculating the CCFL radian that Fig. 7 provides for the embodiment of the present invention two;
The thickness of the LGP that Fig. 8 provides for the embodiment of the present invention and the optical efficiency relation curve schematic diagram of light inlet;
The structural representation of a kind of backlight module that Fig. 9 provides for the embodiment of the present invention three.
Reference numeral:
Reflector plate at the bottom of 10-; The 20-LGP; The 30-blooming piece; 40-CCFL; The 50-lampshade.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the present invention provides a kind of backlight module, comprise LGP 20, be arranged at the CCFL40 of at least one side of described LGP, the distance of described LGP 20 is arrived to the distance of described LGP 20 in the two ends of described CCFL40 less than the centre position of described CCFL40.
Need to prove, the first, in all embodiment of the present invention, the two ends of described CCFL40 refer to, relatively whole CCFL is along effective two end points places of luminous zone on its length direction; Accordingly, the centre position of described CCFL40 refers to, relatively whole CCFL locates in the middle of its length direction.
For example, as shown in Figure 2, the backlight module in the demonstration product of present 18.5 inches is as example, and described CCFL40 comprises effective luminous zone, and the not luminous zone that is positioned at both sides; Wherein, the length of luminous zone is not 1.5 ± 0.2mm, and the length of whole CCFL40 is 421 ± 1mm.If the two ends not length of luminous zone are 1.5mm, the length of whole CCFL40 is 421mm, and, the two ends of the CCFL40 of indication, be and go up along its length in embodiments of the present invention, 1.5mm place, and 419.5mm place.
The second, the two ends of described CCFL40 refer to the distance of described LGP 20, and the two ends of described CCFL40 are to described LGP 20 and the vertical range hithermost side of described CCFL40.In like manner the centre position of described CCFL40 refers to the distance of described LGP 20, and the centre position of described CCFL40 is to described LGP 20 and the vertical range hithermost side of described CCFL40.
The 3rd, the two ends of described CCFL40 are to the distance of described LGP 20, and the centre position of described CCFL40 sets according to actual conditions to the distance of described LGP 20, do not do restriction at this.
Design principle of the present invention is described below: as shown in Figure 3, be the brightness of described CCFL40 and the relation curve schematic diagram of length.As can be seen from Figure 3, the brightness at the brightness ratio two ends at place, the centre position of described CCFL40 is large.
Backlight module in the demonstration product of 18.5 inches is as example, and with reference to shown in Figure 3, the brightness in the centre position of described CCFL40 is greatly about 68000cd/m
2, and its brightness the closer to the position at two ends become more and more less.
As shown in Figure 4, arrive the distance of described LGP 20 and the relation curve schematic diagram of the brightness of described CCFL40 for described CCFL40.As can be seen from Figure 4, when described CCFL40 was far away to the distance of described LGP 20, the brightness of described CCFL40 is step-down gradually also.
Backlight module in the demonstration product of 18.5 inches is as example, and with reference to shown in Figure 4, when described CCFL40 was approximately 1.2mm to the distance of described LGP 20, the brightness of described CCFL40 at this moment was the brightest, is approximately 66000cd/m
2, and at described CCFL40 to the distance of described LGP 20 during greater than 1.2mm, along with difference is increasing, it is more and more less that its brightness becomes.
By above-mentioned analysis as can be known, for the homogeneity of the brightness that improves backlight module, can change the two ends of described CCFL40 to the distance of described LGP 20, thereby the luminous flux that the two ends that make described CCFL40 and mid portion are injected described LGP 20 is identical.
The embodiment of the present invention provides a kind of backlight module, described backlight module comprises LGP 20, be arranged at the CCFL40 of at least one side of described LGP, the distance of described LGP 20 is arrived to the distance of described LGP 20 in the two ends of described CCFL40 less than the centre position of described CCFL40; Make so the two ends of described CCFL40 and the Distance Shortened between LGP 20, thereby improve the brightness at backlight module two ends, and then improve the homogeneity of the brightness of backlight module.
Optionally, described backlight module also comprises: the end reflector plate 10 that is arranged at described LGP below.
Optionally, backlight module also comprises: the blooming piece 30 that is arranged at described LGP top.
Embodiment one, provides a kind of backlight module, as shown in Figure 5, this backlight module comprises: end reflector plate 10, be arranged at the LGP 20 on reflector plate of the described end, be arranged at the blooming piece 30 of described LGP top, be arranged at the CCFL40 of at least one side of described LGP; Wherein, the distance of described LGP 20 is arrived to the distance of described LGP 20 in the two ends of described CCFL40 less than the centre position of described CCFL40.
Described CCFL40 by Fig. 4 can find out with the relation curve schematic diagram of the brightness of described CCFL40 to the distance of described LGP 20, when the two ends of described CCFL40 to the distance of described LGP 20 less than the centre position of described CCFL40 to described LGP 20 apart from the time, in the brightness compared to existing technology at the two ends of described CCFL40, to the equidistant situation of described LGP 20, its brightness brightens to the centre position of the distance of described LGP 20 and described CCFL40 at the two ends of described CCFL40.
Need to prove herein, in the embodiment of the present invention one, the shape of described CCFL40 is not done restriction, the two ends that only need described CCFL40 get final product less than the centre position of the described CCFL40 distance to described LGP 20 to the distance of described LGP 20.
Preferably, described CCFL40's is shaped as arc.
Further, the two ends of described CCFL40 equate to the distance of described LGP 20.
Embodiment two, provide a kind of applicable to 18.5 inches backlight modules that show product, with reference to figure 5, this backlight module comprises: end reflector plate 10, be arranged at the LGP 20 on reflector plate of the described end, be arranged at the blooming piece 30 of described LGP top, be arranged at the CCFL40 of at least one side of described LGP.
Described CCFL40 is shaped as arc, the distance of described LGP 20 is arrived to the distance of described LGP 20 in the two ends of described CCFL40 less than the centre position of described CCFL40, wherein, as shown in Figure 6, the two ends of described CCFL40 can be 1.2mm to the distance of described LGP 20, and the center of described CCFL40 can be 1.7mm (not marking in figure) to the distance of described LGP 20.
Described CCFL40 by Fig. 4 can find out with the relation curve schematic diagram of the brightness of described CCFL40 to the distance of described LGP 20, when the two ends of described CCFL40 are 1.2mm to the distance of described LGP 20, the brightness of described CCFL40 is the brightest, like this can be so that the brightness at the two ends of described CCFL40 brightens.
In addition, in embodiments of the present invention, when the two ends of described CCFL40 are 1.2mm to the distance of described LGP 20, when the center of described CCFL40 is 1.7mm to the distance of described LGP 20, can obtain according to LGP 20 radian value of the described CCFL40 of arc along the length computation of described CCFL40 length direction.
For example, as shown in Figure 7, make boost line, be defined as R, in order to radian value and the angle value θ that calculates described CCFL40.Show in products according to present 18.5 inches, LGP 20 along half length of described CCFL40 length direction take 210mm as example, can obtain as follows:
210
2+(R-0.5)
2＝R
2①；
Arctanθ＝210/R②；
By above-mentioned two formula, can draw θ=0.273 °; By the conversion relation of angle value and radian value, just can obtain radian is 0.00476.
Preferably, along on the length direction of described CCFL40, the thickness of described LGP 20 is increased progressively to two ends by the centre position.
As shown in Figure 8, be the thickness of LGP 20 and the optical efficiency relation curve schematic diagram of light inlet.As can be seen from Figure 8, when the thickness of LGP 20 was 6mm, optical efficiency was approximately 65%, and the thickness of LGP 20 is when being 6.2mm, and optical efficiency is approximately 74%, and hence one can see that, and LGP 20 thickness are when large, and optical efficiency is high.
As seen from the above description, homogeneity for the brightness that improves backlight module, can change the thickness of LGP 20, especially increase along the thickness at the above LGP of the length direction of described CCFL40 20 two ends, thereby the luminous flux that makes CCFL40 two ends and mid portion inject LGP is identical.
Need to prove, the thickness of LGP 20 is set according to actual needs, does not do restriction at this.
For the light that better utilizes CCFL40 to emit, preferably, described backlight module also comprises: be around in described CCFL40 lampshade 50 on every side, described lampshade is preferably U-shaped, in order further to improve light utilization, described lampshade 50 can arrange the reflecting layer near the face of CCFL, or lampshade is the reflectivity lampshade.
Embodiment three, as shown in Figure 9, this backlight module comprises: end reflector plate 10, be arranged at the LGP 20 on reflector plate of the described end, be arranged at the blooming piece 30 of described LGP top, be arranged at the CCFL40 of at least one side of described LGP, and be around in the U-shaped lampshade 50 around described CCFL40.Described lampshade 50 can arrange the reflecting layer near the face of CCFL40, or described lampshade 50 is the reflectivity lampshade.
Wherein, described CCFL40 is shaped as arc, the two ends of described CCFL40 to the distance of described LGP 20 less than the centre position of the described CCFL40 distance to described LGP 20.
Need to prove, in the accompanying drawing of all embodiment of the present invention, a side that all is arranged at described LGP 20 take described CCFL40 illustrates as example, but the embodiment of the present invention is not limited to this.
The embodiment of the present invention provides a kind of backlight module, described backlight module comprises LGP 20, be arranged at the CCFL40 of described LGP side, and be around in U-shaped lampshade 50 around described CCFL, wherein said CCFL40 is shaped as arc, and the two ends of described CCFL40 to the distance of described LGP 20 less than the centre position of the described CCFL40 distance to described LGP 20; Make so the two ends of described CCFL40 and the Distance Shortened between LGP 20, thereby improve the brightness at backlight module two ends, and can solve the problem of angle relation brightness homogeneity in TCO, and then improve the homogeneity of the brightness of backlight module.
The embodiment of the present invention provides a kind of display unit, comprises above-mentioned backlight module.
Above-mentioned display unit can be specifically liquid crystal indicator, can have for liquid crystal display, LCD TV, Electronic Paper, OLED display floater, DPF, mobile phone, panel computer etc. product or the parts of any Presentation Function.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by described protection domain with claim.
Claims (10)
1. backlight module comprises: LGP is arranged at the CCFL of at least one side of described LGP; It is characterized in that, the distance of described LGP is arrived to the distance of described LGP in the two ends of described CCFL less than the centre position of described CCFL.
2. backlight module according to claim 1, is characterized in that, described CCFL is shaped as arc.
3. backlight module according to claim 1 and 2, is characterized in that, the two ends of described CCFL equate to the distance of described LGP.
4. backlight module according to claim 1, is characterized in that, along on the length direction of described CCFL, the thickness of described LGP is increased progressively to two ends by the centre position.
5. backlight module according to claim 1, is characterized in that, also comprises: be around in described CCFL lampshade on every side.
6. backlight module according to claim 5, is characterized in that, described lampshade is U-shaped.
7. backlight module according to claim 5, is characterized in that, the face of the close described CCFL of described lampshade is provided with the reflecting layer or described lampshade is the reflectivity lampshade.
8. backlight module according to claim 1, is characterized in that, also comprises: the end reflector plate that is arranged at described LGP below.
9. backlight module according to claim 1, is characterized in that, also comprises: the blooming piece that is arranged at described LGP top.
10. a display unit, is characterized in that, comprises the described backlight module of claim 1 to 9 any one.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100604295A CN103148414A (en) | 2013-02-26 | 2013-02-26 | Back light unit and display device |
| PCT/CN2013/073902 WO2014131225A1 (en) | 2013-02-26 | 2013-04-08 | Backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100604295A CN103148414A (en) | 2013-02-26 | 2013-02-26 | Back light unit and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103148414A true CN103148414A (en) | 2013-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013100604295A Pending CN103148414A (en) | 2013-02-26 | 2013-02-26 | Back light unit and display device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103148414A (en) |
| WO (1) | WO2014131225A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW585272U (en) * | 2003-05-19 | 2004-04-21 | Toppoly Optoelectronics Corp | Flat light source structure |
| KR100879951B1 (en) * | 2007-07-02 | 2009-01-23 | 희성전자 주식회사 | Side Dimming Backlight Unit |
| CN201462582U (en) * | 2009-08-04 | 2010-05-12 | 北京京东方光电科技有限公司 | Sidelight type backlight module of CCFL |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5619351A (en) * | 1992-07-13 | 1997-04-08 | Seiko Epson Corporation | Surface-type illumination device and liquid crystal display |
| JP4341292B2 (en) * | 2003-05-08 | 2009-10-07 | パナソニック株式会社 | Backlight device |
| CN202266945U (en) * | 2011-10-27 | 2012-06-06 | 华灿光电股份有限公司 | Side-light type backlight module |
| CN202330758U (en) * | 2011-11-18 | 2012-07-11 | 宝诺(福建)电子有限公司 | Novel light guide plate for back light module |
-
2013
- 2013-02-26 CN CN2013100604295A patent/CN103148414A/en active Pending
- 2013-04-08 WO PCT/CN2013/073902 patent/WO2014131225A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW585272U (en) * | 2003-05-19 | 2004-04-21 | Toppoly Optoelectronics Corp | Flat light source structure |
| KR100879951B1 (en) * | 2007-07-02 | 2009-01-23 | 희성전자 주식회사 | Side Dimming Backlight Unit |
| CN201462582U (en) * | 2009-08-04 | 2010-05-12 | 北京京东方光电科技有限公司 | Sidelight type backlight module of CCFL |
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| Publication number | Publication date |
|---|---|
| WO2014131225A1 (en) | 2014-09-04 |
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Application publication date: 20130612 |