CN1567051A - Straight down type backlight module - Google Patents
Straight down type backlight module Download PDFInfo
- Publication number
- CN1567051A CN1567051A CN 03139732 CN03139732A CN1567051A CN 1567051 A CN1567051 A CN 1567051A CN 03139732 CN03139732 CN 03139732 CN 03139732 A CN03139732 A CN 03139732A CN 1567051 A CN1567051 A CN 1567051A
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- China
- Prior art keywords
- backlight module
- fresnel lens
- linear fresnel
- type backlight
- direct
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- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Planar Illumination Modules (AREA)
Abstract
本发明公开一种直下式背光模组。该直下式背光模组包括灯管、部分围绕灯管的灯罩、线性菲涅耳透镜片和框架。该灯管和灯罩位于框架和线性菲涅耳透镜片所界定的区域内，灯管发出的光线和灯罩反射的光线经由线性菲涅耳透镜片转换成均匀的面光源。本发明直下式背光模组由于采用线性菲涅耳透镜片，可提升直下式背光模组的出光均匀度；并且由于采用单一灯管的设计，其成本低、耗电量小。另外，本发明还具有机构设计简单的优点。
The invention discloses a direct type backlight module. The direct-type backlight module includes a lamp tube, a lamp shade partially surrounding the lamp tube, a linear Fresnel lens sheet and a frame. The lamp tube and the lampshade are located in the area defined by the frame and the linear Fresnel lens sheet, and the light emitted by the lamp tube and the light reflected by the lampshade are converted into a uniform surface light source through the linear Fresnel lens sheet. The direct-type backlight module of the present invention can improve the uniformity of light emission of the direct-type backlight module because of the linear Fresnel lens sheet; and because the design of a single lamp tube is adopted, the cost is low and the power consumption is small. In addition, the present invention also has the advantage of simple mechanism design.
Description
[technical field]
The present invention relates to a kind of module backlight, refer to 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 computer, mobile phone, personal digital assistant.Because the liquid crystal in the LCD itself is not had a 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 also will reach predetermined demand, thereby promotes the visible angle of color contrast, full frame regional luminance effect and the complete machine of LCD.Its power consumption and cost need to reduce as far as possible, and 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; Its optical field distribution 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.
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 at diffuser plate 17 and blast sheet 18 on the glass substrate 15, this helical lamp 12 is nested in a plurality of channels (not indicating) of reflection framework 14.This blast sheet 18 is relative with display panels 20 by clearance 19.
But the prior art down straight aphototropism mode set 10 has following defective: for reaching the outgoing light homogeneity that meets pre-provisioning request, the design of this reflection framework 14 very for being difficult for, 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 down straight aphototropism mode set outgoing light homogeneity is low, cost is high, power consumption is big, the invention provides a kind of outgoing light homogeneity height, cost is low, power consumption is little down straight aphototropism mode set.
The technical scheme of technical solution problem of the present invention is: a kind of down straight aphototropism mode set is provided, comprises that fluorescent tube, part center on lampshade, linear Fresnel lens sheet and the framework of fluorescent tube.This fluorescent tube and lampshade are positioned at the zone that framework and linear Fresnel lens sheet are defined, and the light of light that fluorescent tube sends and lampshade reflection converts uniform surface light source to via the linear Fresnel lens sheet.
The present invention further improves and is: this framework comprises inside surface, and this inside surface forms black print (Black Printing).
Wherein, this linear Fresnel lens sheet comprises lens body and a plurality of projection, and a plurality of projections are positioned at the side that lens body deviates from fluorescent tube.
Wherein, edge tool inner full-reflection (Total InternalReflection, TIR) structure of this linear Fresnel lens sheet.
Wherein, the cross section of these a plurality of projections is triangle, trapezoidal or circular arc.
Wherein, this fluorescent tube be cathode fluorescent tube (Cold Cathode Florescent Lamp, CCFL).
Wherein, inside surface plating one deck reflectance coating of this lampshade.
Wherein, this lampshade and framework are one-body molded.
Wherein, this down straight aphototropism mode set also comprises diffuser plate, and diffuser plate is positioned at the side that lens body is provided with projection.
Compare prior art, the invention has the beneficial effects as follows: down straight aphototropism mode set can promote the outgoing light homogeneity of down straight aphototropism mode set owing to adopt the linear Fresnel lens sheet; And because the design of adopting single fluorescent tube, its cost is low, power consumption is little.In addition, 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 stereographic map of down straight aphototropism mode set of the present invention.
Fig. 3 is the light path synoptic diagram of down straight aphototropism mode set of the present invention.
[embodiment]
See also Fig. 2, down straight aphototropism mode set 100 of the present invention comprises that fluorescent tube 120, part center on lampshade 130, linear Fresnel lens sheet 140, diffuser plate 150 and the framework 110 of fluorescent tube 120.This fluorescent tube 120 and lampshade 130 are positioned at the zone that framework 110 and linear Fresnel lens sheet 140 are defined, diffuser plate 150 is positioned at linear Fresnel lens sheet 140 1 sides, and the light of the light that fluorescent tube 120 sends and lampshade 130 reflections converts uniform surface light source to after via linear Fresnel lens sheet 140 and diffuser plate 150.
This fluorescent tube 120 can be cold-cathode fluorescence lamp.CCFL 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 120 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 CCFL is similar with fluorescent tube, relies on the energy state of gas atom in the lamp 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, free electron in the fluorescent tube is quickened by electric field and excites 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 fluorophor through exciting tube wall, by adjusting the prescription of fluorophor, can send the light of different-colour, as red partially or inclined to one side indigo plant to meet the requirement of different displays.
The effect of this lampshade 130 is part encirclement fluorescent tube 120, and the light source that reflection fluorescent tube 120 sends is sent into light source in the linear Fresnel lens sheet 140 as far as possible.
This linear Fresnel lens sheet 140 is the aplanat of a kind of " large aperture " in fact, and its optical effect is suitable with common convex lens, but thinner, in light weight than convex lens.Linear Fresnel lens sheet 140 comprises lens body 141 and a plurality of projection 142, and these a plurality of projections 142 are arranged at the side of lens body 141 back to fluorescent tube 120, and its cross section is a triangle.During design, the selection of projection number of rings is most important.Linear Fresnel lens sheet 140 number of rings are many more, help to reduce spherical aberration and lens thickness, make hot spot more even.
This framework 110 is used to accommodate fluorescent tube 120 and lampshade 130, and works to support linear Fresnel lens 140.For preventing that light from reflecting away from framework 110, absorb the diffused light (Stray Light) that is free between framework 110 and the linear Fresnel lens sheet 140, the inside surface 111 of framework 110 forms black print.
See also Fig. 3, during work, fluorescent tube 120 emits beam, and part light is directly into being incident upon linear Fresnel lens sheet 140, and all the other light are incident to linear Fresnel lens sheet 140 equally after lampshade 130 reflections.Linear Fresnel lens sheet 140 for directional light, makes its diffusion with the light collimation simultaneously, is uniformly distributed in the bright dipping zone, forms required area source.Diffuser plate 150 is positioned at linear Fresnel lens sheet 140 1 sides, in order to the uniformity coefficient of further lifting emergent light.
Certainly, down straight aphototropism mode set of the present invention can also have the embodiment of other improvement or replacement.For example, adopt the inner full-reflection structure in the edge of linear Fresnel lens 140.Because, for linear Fresnel lens sheet 140, the closer to the edge, the angle that light is incident to lens is big more, the reflection loss composition is also big more, if adopt the TIR structure, can make incident angle near 0 degree, significantly reduce rims of the lens reflection of light loss, the outward appearance that helps that lens are presented and more evenly illuminate.But these lampshade 130 inside surface plating one deck highly reflecting films layers.This lampshade 130 can be one-body molded with framework 110.The cross section of this projection 142 also can be trapezoidal or circular arc.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031397328A CN100370337C (en) | 2003-07-04 | 2003-07-04 | Direct type backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031397328A CN100370337C (en) | 2003-07-04 | 2003-07-04 | Direct type backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1567051A true CN1567051A (en) | 2005-01-19 |
| CN100370337C CN100370337C (en) | 2008-02-20 |
Family
ID=34470688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031397328A Expired - Fee Related CN100370337C (en) | 2003-07-04 | 2003-07-04 | Direct type backlight module |
Country Status (1)
| Country | Link |
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| CN (1) | CN100370337C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350313C (en) * | 2005-02-08 | 2007-11-21 | 友达光电股份有限公司 | LCD backlight assembly |
| CN100359381C (en) * | 2005-02-08 | 2008-01-02 | 友达光电股份有限公司 | Disc lens and point light source of backlight assembly |
| CN100430801C (en) * | 2005-05-27 | 2008-11-05 | 友达光电股份有限公司 | Backlight module and lighting device thereof |
| CN100472269C (en) * | 2005-02-08 | 2009-03-25 | 友达光电股份有限公司 | Disc lens and point light source of backlight assembly |
| CN107015298A (en) * | 2017-05-03 | 2017-08-04 | 成都菲斯特科技有限公司 | A kind of preparation method of linear Fresnel lens |
| CN113266780A (en) * | 2021-07-05 | 2021-08-17 | 江苏中科贯微自动化科技有限公司 | Line light source capable of realizing uniform narrow linewidth distribution of LED light |
| CN114973992A (en) * | 2022-05-23 | 2022-08-30 | 南京阿德庞斯信息科技有限公司 | 4K image ultrahigh-definition display equipment |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03126982A (en) * | 1989-10-13 | 1991-05-30 | Omron Corp | Display device |
| US5479328A (en) * | 1994-01-05 | 1995-12-26 | Interstate Electronics Corporation | High-brightness, high-efficacy backlight |
| KR0177648B1 (en) * | 1995-07-05 | 1999-05-01 | 배순훈 | Rear-view projector screen |
| GB2320156A (en) * | 1996-12-07 | 1998-06-10 | Sharp Kk | Directional display and method of making a mask for a directional display |
| US6407859B1 (en) * | 1999-01-13 | 2002-06-18 | 3M Innovative Properties Company | Fresnel lens for projection screen |
| JP2003519817A (en) * | 2000-01-14 | 2003-06-24 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Display device |
| JP4293300B2 (en) * | 2001-05-24 | 2009-07-08 | シャープ株式会社 | Illumination device and display device including the same |
-
2003
- 2003-07-04 CN CNB031397328A patent/CN100370337C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350313C (en) * | 2005-02-08 | 2007-11-21 | 友达光电股份有限公司 | LCD backlight assembly |
| CN100359381C (en) * | 2005-02-08 | 2008-01-02 | 友达光电股份有限公司 | Disc lens and point light source of backlight assembly |
| CN100472269C (en) * | 2005-02-08 | 2009-03-25 | 友达光电股份有限公司 | Disc lens and point light source of backlight assembly |
| CN100430801C (en) * | 2005-05-27 | 2008-11-05 | 友达光电股份有限公司 | Backlight module and lighting device thereof |
| CN107015298A (en) * | 2017-05-03 | 2017-08-04 | 成都菲斯特科技有限公司 | A kind of preparation method of linear Fresnel lens |
| CN113266780A (en) * | 2021-07-05 | 2021-08-17 | 江苏中科贯微自动化科技有限公司 | Line light source capable of realizing uniform narrow linewidth distribution of LED light |
| CN114973992A (en) * | 2022-05-23 | 2022-08-30 | 南京阿德庞斯信息科技有限公司 | 4K image ultrahigh-definition display equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100370337C (en) | 2008-02-20 |
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Granted publication date: 20080220 Termination date: 20170704 |