CN1595255A - Direct type backlight module - Google Patents
Direct type backlight module Download PDFInfo
- Publication number
- CN1595255A CN1595255A CN 03146802 CN03146802A CN1595255A CN 1595255 A CN1595255 A CN 1595255A CN 03146802 CN03146802 CN 03146802 CN 03146802 A CN03146802 A CN 03146802A CN 1595255 A CN1595255 A CN 1595255A
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- Prior art keywords
- mode set
- light
- down straight
- aphototropism mode
- straight aphototropism
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Abstract
This invention discloses a straight down aphototropism mode set, which comprises at least one light tube, light cover surrounding the light tube part, diffusing plate and reflection element. The light tube and light cover are located in the defined area of reflection element and diffusing plate and the light cover is located between the light tube and the diffusing plate. The light beam sent from the tube is transmitted into the diffusing plate and is translated into the even plane light after the light cover reaction. This invention of down straight aphototropism mode set has high evenness of the out light.
Description
[technical field]
The present invention relates to a kind of module backlight, be meant a kind of down straight aphototropism mode set that adopts fluorescent tube especially.
[background technology]
Because advantages such as LCD has gently, approaches, power consumption is little are widely used in modernized information equipments such as notebook, mobile phone, personal digital assistant.Because liquid crystal itself does not have the characteristics of luminescence, need provide module backlight to realize Presentation Function for it.Module backlight can be divided into two kinds of side-light type module backlight and down straight aphototropism mode set by structure.Wherein, down straight aphototropism mode set is mainly used in fields such as LCD monitor or LCD TV.
As everyone knows, down straight aphototropism mode set need have higher emitting brightness, and its outgoing light homogeneity will reach predetermined demand, thereby promotes the visible angle of color contrast, full frame regional luminance effect and the complete machine of the LCD that adopts this module backlight.In addition, for adapting to light, the thin requirement of LCD, its structural design can not too complex.
The down straight aphototropism mode set of prior art generally comprises a plurality of light emitting diodes array of source of forming and the diffuser panel that places array of source exiting surface one side.But, adopt the down straight aphototropism mode set of light emitting diode to have following defective: the price height of light emitting diode, the cost of increase down straight aphototropism mode set; The optical field distribution of light emitting diode is the rotation symmetry shape, and outgoing light homogeneity is difficult to reach the demand of LCD; And in order to mate diffuser panel, need to adopt the design of a plurality of light emitting diodes, make that the array of source volume is big, complex structure and power consumption is big, and when a certain light emitting diode breaks down, can influence whole outgoing light homogeneity.Light source sends the transmission direction of light beam, converts line source or pointolite to the area source outgoing.
Therefore, industry develops and the down straight aphototropism mode set of employing fluorescent tube as light source.A kind of prior art down straight aphototropism mode set can be consulted the United States Patent (USP) of being announced Dec 26 nineteen ninety-five the 5th, 479, No. 328 (Fig. 1 reference).This down straight aphototropism mode set 10 provides illumination for display panels 20, comprise helical lamp (Serpentine Tube) 12, reflection framework 14, glass substrate 15, be arranged on diffuser plate 17 and blast sheet 18 on the glass substrate 15, this helical lamp 12 is nested in a plurality of passages (not indicating) of reflection framework 14.This blast sheet 18 is relative with display panels 20 by clearance 19.
But because these down straight aphototropism mode set 10 simple diffuser plates 17 that adopt come the light beam of homogenising outgoing, promptly its outgoing light homogeneity depends on the quality of diffuser plate 17, and its control is difficulty comparatively, and outgoing light homogeneity is not ideal enough.See also Fig. 2, because the Luminance Distribution of the light that fluorescent tube 12 sends and square distance are inversely proportional to, the light beam of these down straight aphototropism mode set 10 outgoing forms the distribution of light and shade inequality according to the difference of light transmission distance on diffuser plate 17 surfaces.
In addition, the prior art down straight aphototropism mode set 10 also has following defective: in order to improve outgoing light homogeneity as far as possible, the design of this reflection framework 14 is very difficult, increases the complexity of down straight aphototropism mode set 10 structures; The complex contour of this helical lamp 12 is made comparatively difficulty, and price and power consumption are higher.
[summary of the invention]
In order to overcome the defective that prior art module outgoing light homogeneity backlight is low, mechanism design is complicated, the invention provides a kind of outgoing light homogeneity height, the simple down straight aphototropism mode set of mechanism design.
The technical scheme of technical solution problem of the present invention is: provide a kind of down straight aphototropism mode set to comprise that at least one fluorescent tube, part center on lampshade, diffuser plate and the reflecting element of fluorescent tube.This at least one fluorescent tube and lampshade are positioned at the zone that reflecting element and diffuser plate define, and lampshade is between fluorescent tube and diffuser plate, and the light that fluorescent tube sends transfers to diffuser plate and converts uniform in-plane light to after the lampshade effect.
Compare the prior art that simple employing diffuser plate comes the light beam of homogenising outgoing, the invention has the beneficial effects as follows: because down straight aphototropism mode set of the present invention adopts the lampshade between fluorescent tube and diffuser plate, the light that fluorescent tube sends carries out transferring to diffuser plate again after transmission and refraction action carry out homogenizing through lampshade, can effectively promote the outgoing light homogeneity of down straight aphototropism mode set; And the reflection framework of a plurality of passages of tool of the relative prior art of the present invention also has the simple advantage of mechanism design.
[description of drawings]
Fig. 1 is the cut-open view of prior art down straight aphototropism mode set.
Fig. 2 is the part index path of down straight aphototropism mode set shown in Figure 1.
Fig. 3 is the stereographic map of down straight aphototropism mode set of the present invention.
Fig. 4 is the stereographic map of lampshade shown in Figure 3.
Fig. 5 is the light path synoptic diagram of down straight aphototropism mode set of the present invention.
[embodiment]
See also Fig. 3, down straight aphototropism mode set 100 of the present invention comprises that a plurality of fluorescent tubes 101, part center on lampshade 102, diffuser plate 103 and the reflecting element 104 of fluorescent tube 101.This fluorescent tube 101 and lampshade 102 are positioned at the zone that reflecting element 104 and diffuser plate 103 are defined, and lampshade 102 is between fluorescent tube 101 and diffuser plate 103, and the light that fluorescent tube 101 sends transfers to diffuser plate 103 and converts uniform in-plane light to after lampshade 102 effect.
This fluorescent tube 101 can be a cold cathode fluorescent lamp, and it has the higher and advantage such as luminescence efficiency is high, caliber is thin, the life-span is long of brightness compared to other light source technology.The caliber of this fluorescent tube 101 is about 10mm, and power is about 8-29w, and the life-span reaches 10000hrs, and luminous flux is about 35-90lm.
The principle of luminosity of this fluorescent tube 101 is similar with fluorescent tube, relies on the energy state of gas atom in the fluorescent tube 101 to convert radioluminescence to.The most frequently used discharge medium is a mercury vapour, can fill inert gas such as assisted activation such as Ar, Kr, Ne in the fluorescent tube 101, free electrons in the fluorescent tube 101 are quickened by electric field and excite the Ar atom, the Ar that is excited makes mercury atom dissociate and the discharging radiation energy again, main 253.7nm and the two kinds of ultraviolet lights of 185nm (UV-Radiation) of producing, the radiation efficiency maximum of 235.7nm wherein, luminous behind the phosphor body through exciting tube wall, by adjusting the prescription of phosphor body, can send the light of different-colour, as red partially or inclined to one side indigo plant to meet the requirement of different displays.
See also Fig. 4, this lampshade 102 adopts optics light-transmitting materials to make, can select for use optical grade acrylic polymers, high molecular polymer, macromolecule carbonization thing, glass or quartzy one of them.This lampshade 102 roughly is the circular arc column, comprise base material 121 and a plurality of diffusion points 122 that are provided with on it, these a plurality of diffusion points 122 are lenticules, the principle that is inversely proportional to according to light luminance and square distance is distributed in base material 121 surfaces, be that corresponding light transmission distance diffusion point 122 at a distance is bigger, and corresponding light transmission distance diffusion point 122 at a distance also can distribute closeer, thereby light homogenising after its refraction and transmission is distributed, and then promote the outgoing light homogeneity of down straight aphototropism mode set 100.Certainly, these a plurality of diffusion points 122 also can be the optical clear particles that is printed on base material 121 surfaces, its can be spherical shape, oval spherical or rectangular-shaped one of them.
Please consult Fig. 3 once more, this diffuser plate 103 is tabular, and its function is to make light beam that fluorescent tube 101 sends and sees through it through the light beam of lampshade 102 transmission and produces abundant scattering when inner, thereby makes light uniformization.This diffuser plate 103 generally comprises substrate and is formed at the diffusion layer of substrate, and substrate adopts the higher material of light transmission rate to make, and it is in order to serve as the carrier of diffusion layer.This diffusion layer adopts general leaded light plastics such as PMMA (PolymethylMethacrylate, polymethylmethacrylate) or PC (Polycarbonate, polycarbonate) etc. to make, and mixes scattering particle simultaneously.Certainly, this diffusion layer also can be a plurality of protrusion scattering points that form on the surface of substrate by printing processing method, the material that scattering point adopted is high diverging light material, its shape can be column, spherical or tetrahedron, can be evenly distributed on the surface of substrate, light beam generation scattering and refraction that it makes incident make the surface evenly outgoing of light beam by diffuser plate 103, and then obtain planar light.
This reflecting element 104 is accommodated fluorescent tube 101 and lampshade 102, and at the coating surface reflectance coating so that projection light reflection thereon, prevent light from the surface effusion of reflecting element 104, thereby improve the efficiency of light energy utilization, increase the emitting brightness of down straight aphototropism mode set 100.
See also Fig. 5, during work, fluorescent tube 101 emits beam, part light is directly into being incident upon lampshade 102, and all the other light are incident to lampshade 102 and diffuser plate 103 after reflecting element 104 reflections, and these lampshade 102 parts are surrounded fluorescent tube 101, make projection light thereon carry out transferring to diffuser plate 103 after transmission and the refraction through diffusion point 122, the light of diffuser plate 103 its receptions of scattering makes it be uniformly distributed in the bright dipping zone, forms required planar light.
Claims (10)
1. down straight aphototropism mode set, comprise at least one fluorescent tube, diffuser plate and reflecting element, it is characterized in that: it further comprises at least one lampshade of part around corresponding fluorescent tube, this fluorescent tube and lampshade are housed in the space that reflecting element and diffuser plate define, and lampshade is between fluorescent tube and diffuser plate, and the light that fluorescent tube sends transfers to diffuser plate and converts uniform in-plane light to after the lampshade effect.
2. down straight aphototropism mode set as claimed in claim 1 is characterized in that: this lampshade adopts the optics light-transmitting materials to make.
3. down straight aphototropism mode set as claimed in claim 2 is characterized in that: the material of this lampshade is acrylic polymers, high molecular polymer, macromolecule carbonization thing, glass or quartz.
4. down straight aphototropism mode set as claimed in claim 1 is characterized in that: this lampshade is the circular arc column.
5. down straight aphototropism mode set as claimed in claim 1 is characterized in that: this lampshade comprises base material and is arranged at a plurality of diffusion points of base material.
6. down straight aphototropism mode set as claimed in claim 5 is characterized in that: these a plurality of diffusion points are lenticules.
7. down straight aphototropism mode set as claimed in claim 5 is characterized in that: the size of these a plurality of diffusion points increases progressively with the light transmission distance.
8. down straight aphototropism mode set as claimed in claim 5 is characterized in that: the density of these a plurality of diffusion points increases progressively with the light transmission distance.
9. down straight aphototropism mode set as claimed in claim 1 is characterized in that: these a plurality of diffusion points are the optical clear particles that are printed on substrate surface.
10. down straight aphototropism mode set as claimed in claim 9 is characterized in that: these a plurality of diffusion points are spherical shape, oval spherical or rectangular-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031468020A CN100383640C (en) | 2003-09-11 | 2003-09-11 | Direct type backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031468020A CN100383640C (en) | 2003-09-11 | 2003-09-11 | Direct type backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1595255A true CN1595255A (en) | 2005-03-16 |
| CN100383640C CN100383640C (en) | 2008-04-23 |
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ID=34659674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031468020A Expired - Fee Related CN100383640C (en) | 2003-09-11 | 2003-09-11 | Direct type backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100383640C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7798679B2 (en) | 2007-08-09 | 2010-09-21 | Sharp Kabushiki Kaisha | Light emitting device and lighting device having the same |
| CN102768938A (en) * | 2011-05-04 | 2012-11-07 | 余亮 | Planar electrodeless lamp |
| CN103047583A (en) * | 2012-12-07 | 2013-04-17 | 康佳集团股份有限公司 | Side light direct type backlight module |
| WO2014205999A1 (en) * | 2013-06-27 | 2014-12-31 | 京东方科技集团股份有限公司 | Liquid crystal display module and display apparatus |
| CN104407474A (en) * | 2014-11-28 | 2015-03-11 | 京东方科技集团股份有限公司 | Light bar structure, backlight module and display device |
| CN108761902A (en) * | 2018-03-13 | 2018-11-06 | 友达光电股份有限公司 | Backlight module with reflector plate |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04275525A (en) * | 1991-03-04 | 1992-10-01 | Sharp Corp | Liquid crystal display device with back light |
| JPH11142819A (en) * | 1997-11-05 | 1999-05-28 | Hitachi Ltd | Liquid crystal display device |
| CN2563602Y (en) * | 2002-04-18 | 2003-07-30 | 禾联国际股份有限公司 | Improved light guide board for liquid crystal display |
-
2003
- 2003-09-11 CN CNB031468020A patent/CN100383640C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7798679B2 (en) | 2007-08-09 | 2010-09-21 | Sharp Kabushiki Kaisha | Light emitting device and lighting device having the same |
| CN102768938A (en) * | 2011-05-04 | 2012-11-07 | 余亮 | Planar electrodeless lamp |
| CN102768938B (en) * | 2011-05-04 | 2017-04-12 | 余亮 | Planar electrodeless lamp |
| CN103047583A (en) * | 2012-12-07 | 2013-04-17 | 康佳集团股份有限公司 | Side light direct type backlight module |
| WO2014205999A1 (en) * | 2013-06-27 | 2014-12-31 | 京东方科技集团股份有限公司 | Liquid crystal display module and display apparatus |
| CN104407474A (en) * | 2014-11-28 | 2015-03-11 | 京东方科技集团股份有限公司 | Light bar structure, backlight module and display device |
| CN108761902A (en) * | 2018-03-13 | 2018-11-06 | 友达光电股份有限公司 | Backlight module with reflector plate |
| CN108761902B (en) * | 2018-03-13 | 2022-03-22 | 友达光电股份有限公司 | Backlight module with reflector plate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100383640C (en) | 2008-04-23 |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20080423 Termination date: 20170911 |