CN100414392C - Evenness improving device for backlight module - Google Patents
Evenness improving device for backlight module Download PDFInfo
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- CN100414392C CN100414392C CNB03178495XA CN03178495A CN100414392C CN 100414392 C CN100414392 C CN 100414392C CN B03178495X A CNB03178495X A CN B03178495XA CN 03178495 A CN03178495 A CN 03178495A CN 100414392 C CN100414392 C CN 100414392C
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- light source
- convex structure
- reflection
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Abstract
The present invention discloses a uniformity improving device of a back light module. The present invention comprises a plurality of light sources used for providing illuminating rays, a reflecting base and at least one circular arc-shaped structure sheet, wherein the reflecting base is arranged on one side of the light sources and is used for containing the light sources and reflecting the illuminating rays; the circular arc-shaped structure sheet is arranged on one side of the light sources to uniformize the illuminating rays.
Description
Technical field
The present invention relates to the uniformity coefficient that a kind of backlight module uses and improve device, refer to that especially a kind of uniformity coefficient of the backlight module of LCD or LCD TV that is applicable to improves device.
Background technology
The light source module that flat-panel screens is used can be divided into backlight type (back type) and two kinds of preceding light formulas (front type), and backlight type can be divided into ora terminalis light inlet (edge lighting) and two kinds of straight-down negative light inlets (bottom lighting) again according to the difference of light incoming position.Therefore direct type backlight module is usually used in table and puts non-portable products such as type LCD display (monitor) or LCD TV because module profile thickness is more thick and heavy.Because a plurality of light sources are arranged under the liquid crystal panel in regular turn, so the profile of light source very easily produces problems such as luminance nonuniformity, shade or bright line on the LCD picture.General solution is to use diffuser plate (DiffusingPlate) that light is evenly spread and comes, and makes the shade or the bright line obfuscation at edge, to improve this shortcoming.In addition, the diffuser plate that has also can utilize and add some small grains in the light-transmitting materials flat board, penetrates the phenomenon that light produces refraction or diffusion to be made by control particle size and its density degree, reaches the effect of light uniformization thus.But this mode causes light through after the diffusion sheet, and most light all has been absorbed at this one deck, energy approximately only remaining original 50%, cause the light utilization ratio on the low side.
Summary of the invention
Fundamental purpose of the present invention provides the uniformity coefficient that a kind of backlight module uses and improves device, produces can avoid shade or bright line, improves outgoing light homogeneity and light utilization ratio, so that better demonstration image quality to be provided.
For achieving the above object, the invention provides the uniformity coefficient that a kind of backlight module uses and improve device, comprising: a plurality of light sources, in order to illuminating ray to be provided; One reflection pedestal is positioned at a side of this light source, in order to ccontaining this light source and reflect this illuminating ray; And a plurality of convex structure sheets, wherein per two convex structure sheets are positioned at the side of each this light source with respect to this reflection pedestal, make each this light source between described two convex structure sheets and this reflection pedestal, and in order to this illuminating ray of homogenising.
The light source that the uniformity coefficient that backlight module of the present invention is used is improved the device use is preferably light emitting diode (LED), electroluminescence part (EL) or cold cathode fluorescent tube (CCFL), and the arrangement mode of light source is unrestricted, is preferably to be parallel to each other and equidistantly arrangement.The reflection pedestal that the uniformity coefficient that backlight module of the present invention is used is improved device is preferably metal plate punching or the injection molding method manufacturing forms, and the surface of this reflection pedestal is more preferred from and is coated with a reflection diffusate.The uniformity coefficient that backlight module of the present invention is used improves that device is preferable also to be comprised one and can improve the light focusing unit at half briliancy angle of this illuminating ray, and this light source is preferably between this light focusing unit and this reflection pedestal.The uniformity coefficient that backlight module of the present invention is used is improved in the device, and the material of convex structure sheet is preferably total-reflection type or semi-reflection and semi-transparent formula material; The radius-of-curvature of this convex structure sheet is unrestricted, is preferably the radius greater than cold cathode fluorescent tube (CCFL); And the material of this convex structure sheet is preferably metal, polymethyl methacrylate (PMMA), polycarbonate (PC) or glass.The uniformity coefficient that backlight module of the present invention is used is improved the side of each light source of device or upside and is preferably and has two convex structure sheets respectively; Angle between this two convex structures sheet is preferably between 30 ° to 270 °; The relative position of this two convex structures sheet is unrestricted, can be positioned at same plane or Different Plane, is preferably to be positioned at same plane; The thickness of this two convex structures sheet can be identical or inequality; And the curvature of this two convex structures sheet also can be identical or inequality.The uniformity coefficient that backlight module of the present invention is used is improved the device preferred application in LCD.
Description of drawings
Fig. 1 is the LCD stereographic map of a preferred embodiment of the present invention;
Fig. 2 is the light path synoptic diagram of a preferred embodiment of the present invention;
Fig. 3 a～3c is the synoptic diagram of the various convex structure sheet combinations of the present invention;
Fig. 4 is the simulation result of a preferred embodiment of the present invention;
Fig. 5 is the simulation result of existing comparative example.
Wherein, description of reference numerals is as follows:
1 liquid crystal display, 10 liquid crystal panel module, 20 backlight modules
21 light sources, 22 reflection pedestals, 23 convex structure sheets
30 fluorescent tubes, 301 illuminating raies, 100 zones
200 regional 300 zones
Embodiment
See also Fig. 1, Fig. 1 is the LCD cut-open view of a preferred embodiment of the present invention, and LCD 1 comprises liquid crystal panel module 10 and backlight module 20.Liquid crystal panel module 10 is folded in liquid crystal layer therebetween by two substrates and and is constituted.Backlight module 20 comprises a plurality of light sources 21, reflection pedestal 22 and convex structure sheet 23.Light source 21 can provide liquid crystal panel module 10 illumination light lines for being parallel to the cold cathode fluorescent lamp (CCFL) of liquid crystal panel module 10 downsides.Reflection pedestal 22 is positioned at the downside of light source 21, the illuminating ray that provides in order to ccontaining light source 21 and reflection source 21.Convex structure sheet 23 can be between liquid crystal panel module 10 and reflection pedestal 22, arbitrary side of light source 21, in this preferred embodiment, the upside of each cold cathode fluorescent lamp all is equiped with two reflective convex structure sheets 23, in order to changing the path of illuminating ray, with homogenising it.
See also the light path synoptic diagram of Fig. 2 a preferred embodiment of the present invention.The illuminating ray 301 that fluorescent tube 30 is launched can be distinguished earlier by convex structure sheet 23 or 22 reflections of reflection pedestal, each freely reflects pedestal 22 or 23 reflections of convex structure sheet again, thereby arrive regional 100 and regional 200, it can avoid the generation of fluorescent tube 30 edge bright rays instinctively, but can cause the minimizing of fluorescent tube 30 upper areas 300 brightness, so can suitably adjust curvature, shape, thickness, position or the material of convex structure sheet 23 ... or the like variable.For example, shown in Fig. 3 a, the angle theta of this two convex structures sheet can be between 30 ° to 270 °; Shown in Fig. 3 b, this two convex structures sheet can be positioned at same plane, have the same curvature radius, and its thickness can be inequality; Shown in Fig. 3 c, this two convex structures sheet can be positioned at Different Plane, and its radius-of-curvature can be inequality.Utilize about 30 two fluorescent tubes of fluorescent tube by the light that its convex structure sheet reflection is separately produced, remedy the shortcoming of fluorescent tube 30 upper areas 300 luminance shortage, thus,, and reach the purpose of even bright dipping by this theory and optimization structure Design.
The bright dipping situation of then utilizing TracePro ray machine simulation software to come emulation direct type backlight module 20, Fig. 4 is for adding the simulation result of two convex structure sheets at every CCFL, Fig. 5 does not add the convex structure sheet, the simulation result of simple CCFL.We can see among two figure thus, direct type backlight module of the present invention, and its light uniformity coefficient significantly improves, and the situation of shade or bright line is obviously eliminated, and the light utilization ratio can be increased to more than 70% by 40%, makes LCD present better demonstration image quality.In addition,, curvature, shape, thickness, position or material etc. are for example arranged,, can make LCD obtain best display effect by above-mentioned variable is suitably changed and optimization because the adjustable variables of convex structure sheet is very various.
The foregoing description only is to give an example for convenience of description, and those skilled in the art's equivalent structure transformation that content and accompanying drawing have been done according to the present invention all is included in the claim of the present invention.But not only limit to the foregoing description.
Claims (14)
1. the uniformity coefficient used of a backlight module is improved device, comprising:
A plurality of light sources are in order to provide illuminating ray;
One reflection pedestal is positioned at a side of this light source, in order to ccontaining this light source and reflect this illuminating ray;
And
A plurality of convex structure sheets, wherein per two convex structure sheets are positioned at the side of each this light source with respect to this reflection pedestal, make each this light source between described two convex structure sheets and this reflection pedestal, and in order to this illuminating ray of homogenising.
2. device as claimed in claim 1 is characterized in that, this light source is light emitting diode, electroluminescence part or cold cathode fluorescent tube.
3. device as claimed in claim 1 is characterized in that, this light source is for being parallel to each other and equidistantly arranging.
4. device as claimed in claim 1 is characterized in that, this reflection pedestal is that metal plate punching or injection molding method manufacturing form.
5. device as claimed in claim 1 is characterized in that, the surface-coated of this reflection pedestal has a reflection diffusate.
6. device as claimed in claim 1 is characterized in that, also comprise one and can improve the light focusing unit at half briliancy angle of this illuminating ray, and this light source is between this light focusing unit and this reflection pedestal.
7. device as claimed in claim 1 is characterized in that, the material of this convex structure sheet is total-reflection type or semi-reflection and semi-transparent formula material.
8. device as claimed in claim 2 is characterized in that the radius-of-curvature of this convex structure sheet is greater than the radius of this cold cathode fluorescent tube.
9. device as claimed in claim 1 is characterized in that, the upside of each this light source has two these convex structure sheets.
10. device as claimed in claim 9 is characterized in that, the angle between this two convex structures sheet is between 30 ° to 270 °.
11. device as claimed in claim 9 is characterized in that, this two convex structures sheet can be positioned at same plane or Different Plane.
12. device as claimed in claim 9 is characterized in that, the thickness or the curvature of this two convex structures sheet are inequality.
13. device as claimed in claim 1 is characterized in that, the material of this convex structure sheet is metal, polymethyl methacrylate, polycarbonate or glass.
14. device as claimed in claim 1 is characterized in that, this device is applied to LCD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB03178495XA CN100414392C (en) | 2003-07-18 | 2003-07-18 | Evenness improving device for backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB03178495XA CN100414392C (en) | 2003-07-18 | 2003-07-18 | Evenness improving device for backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1570727A CN1570727A (en) | 2005-01-26 |
| CN100414392C true CN100414392C (en) | 2008-08-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB03178495XA Ceased CN100414392C (en) | 2003-07-18 | 2003-07-18 | Evenness improving device for backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100414392C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996034229A1 (en) * | 1995-04-26 | 1996-10-31 | Lazar Istvan | Reflecting surface, in particular for linear light sources, preferably fluorescent lamps or compact fluorescent lamps |
| JP2001092368A (en) * | 1999-09-24 | 2001-04-06 | Toshiba Lighting & Technology Corp | Back light device and liquid crystal display device |
| JP2003084280A (en) * | 2001-09-11 | 2003-03-19 | Sanyo Electric Co Ltd | Liquid crystal display device |
-
2003
- 2003-07-18 CN CNB03178495XA patent/CN100414392C/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996034229A1 (en) * | 1995-04-26 | 1996-10-31 | Lazar Istvan | Reflecting surface, in particular for linear light sources, preferably fluorescent lamps or compact fluorescent lamps |
| JP2001092368A (en) * | 1999-09-24 | 2001-04-06 | Toshiba Lighting & Technology Corp | Back light device and liquid crystal display device |
| JP2003084280A (en) * | 2001-09-11 | 2003-03-19 | Sanyo Electric Co Ltd | Liquid crystal display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1570727A (en) | 2005-01-26 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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Decision date of declaring invalidation: 20140211 Decision number of declaring invalidation: 22051 Granted publication date: 20080827 |