CN100432778C - Light background module with light collecting function - Google Patents
Light background module with light collecting function Download PDFInfo
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- CN100432778C CN100432778C CNB2004100455766A CN200410045576A CN100432778C CN 100432778 C CN100432778 C CN 100432778C CN B2004100455766 A CNB2004100455766 A CN B2004100455766A CN 200410045576 A CN200410045576 A CN 200410045576A CN 100432778 C CN100432778 C CN 100432778C
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- light
- guide plate
- backlight module
- diffusion sheet
- light guide
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Abstract
The present invention relates to a back light module with a light collecting function. The present invention comprises a light guide plate, a light emitting source and three diffusing sheets, wherein the light guide plate is provided with a light incident surface and a light emergent surface, and the light emergent surface is corresponding to a liquid crystal panel. Light emitted by the light emitting source enters the light guide plate through the light incident surface and is emitted through the light emergent surface, and the diffusing sheets are overlapped and are arranged above the light emergent surface. Light emitted by the light emergent surface is collected by the diffusing sheets and then is output, and the collected light is used as a back light source used for displaying images on the liquid crystal panel.
Description
Technical field
The present invention is meant a kind of backlight module with light harvesting function especially relevant for a kind of backlight module of liquid crystal panel.
Background technology
Along with the manufacturing technology of thin film transistor (TFT) is progressive apace, with and possess advantage such as light, thin, power saving is arranged, the no width of cloth is penetrated, therefore make liquid crystal panel be applied in large quantities in the various electronic products such as personal digital assistant, mobile computer, digital camera, TV and mobile phone.But because liquid crystal panel belongs to non-self-luminous display device, it must see through the auxiliary of backlight that backlight module provided, the image information of liquid crystal panel can be shown.
See also shown in Figure 1A, Figure 1B, it is the type backlight module synoptic diagram that adds lustre to of prior art.Among the figure, backlight module 10 comprises a light guide plate 11, a light emitting source 12, a reflecting plate 13 and multilayer optical film 14.
Multilayer optical film 14 mainly is that (brightnessenhancement film, diffusion sheet 143 is formed BEF) and on one by diffusion sheet 141 once, a brightening piece 142.And from bottom to top superimposed in regular turn in the exiting surface 111 of light guide plate 11, wherein upper and lower diffusion sheet 143,141 can make the more even diffusion of light, and brightening piece 142 then can increase the brightness of light.Light not only can obtain the better backlight of quality through after the effect of above-mentioned optical thin film 14, and the display effect of liquid crystal panel 20 also can be better.
The brightening piece that existing market is supplied costs an arm and a leg, become the bottleneck that reduces cost, the BEF III of being produced with 3M company and the brightening piece of two kinds of specifications of DBEF are example, and general every price of diffusion sheet is 1/5th of BEF III, especially 1/10th of DBEF.
See also shown in Fig. 2 A, it is a prior art BEF III brightening piece structural representation, the employed material of BEF III brightening piece 142a is PMMA, its surface is provided with a plurality of jagged prism structures 15 can increase light luminance, though BEF III brightening piece 142a has the function of adding lustre to, but because prism structure 15 is regular the arrangement, therefore having the folded line of shade interferes the phenomenon of (Moire) to produce, in addition, diffusion sheet 143 and following diffusion sheet 141 used together on BEF III brightening piece 142a must arrange in pairs or groups, can bring into play light enhancing effect, and avoid prism structure 15 to suffer outside destroy.
See also shown in Fig. 2 B, it is the principle schematic of adding lustre to of prior art DBEF brightening piece 142b.Wherein, the left side light of figure directly enters liquid crystal panel 20 by light guide plate 11.The right side light of figure is earlier through entering liquid crystal panel 20 again after the DBEF brightening piece 142b, and be respectively equipped with on one polarizing board 201 and polarizing board 202 once on the upper and lower surface of liquid crystal panel 20, it is orthogonal with the polarization direction of following polarizing board 202 wherein to go up polarizing board 201.
Left side light (P1 in figure, when P2) running into down polarizing board 202,, so can waltz through liquid crystal panel 20 because the polarization direction of P1 light is identical with following polarizing board 202, and the polarization direction of P2 light is vertical with following polarizing board 202, therefore can't be by polarizing board 202 down.Right side light in figure (P1, when P2) meeting DBEF brightening piece 142b, P1 light will waltz through DBEF brightening piece 142b and following polarizing board 202 enters liquid crystal panel 20 inside, and P2 light is then by DBEF brightening piece 142b reflected back light guide plate 11 inside.At this moment, P2 light will penetrate the light that contains P1 and P2 polarization direction once again through after the scattering of light guide plate 11.Because DBEF brightening piece 142b can be with the light recycling of P2 polarization direction, so light enhancing effect is preferable, yet its shortcoming is that price is too expensive.
As shown in the above description, if adopt the mode of Fig. 2 A to add lustre to, except using BEF III brightening piece, still need and want the cooperation of upper and lower diffuser plate.Therefore generally speaking, the cost of optical thin film is difficult to descend, and the generation that can't avoid the folded line of shade to interfere when too fitting tightly of BEF III and last diffusion sheet.If adopt the mode of Fig. 2 B to add lustre to, except using the DBEF brightening piece, still need and to descend the cooperation of diffuser plate again.Therefore its cost will be higher.In addition, prior art is when carrying out the assembling of brightening piece and diffusion sheet, and diffusion sheet is influenced yield by scratch easily.
For above-mentioned reasons, make that the production cost of backlight module integral body is too high, not only cause holding at high price of product, also make manufacturer's profit to promote, influence then is to cause comprehensively universalness of the utilization rate of LCD in one's power.Therefore, for the research staff of photoelectricity association area, there's no one who doesn't or isn't be devoted to propose preferable solution, in the hope of obtaining backlight module more cheap and that quality is better.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of backlight module with light harvesting function.
The backlight module that provides a kind of manufacturing cost lower is provided.
Another purpose of the present invention is to provide a kind of backlight module of easy assembling.
The disclosed backlight module of the present invention needed backlight when a liquid crystal panel show image to be provided, it is made up of light guide plate, light emitting source and diffusion sheet group.
Light guide plate is the clapboard structure of light-permeable, and its material is based on acryl.The upper surface of light guide plate is an exiting surface and corresponding with liquid crystal panel, and the one side surface is an incidence surface.In addition, then be to be formed with a plurality of diffusion points at the lower surface of light guide plate, its below then is to be provided with reflecting plate.
Light emitting source adopts cold-cathode tube, and in end face irradiation mode light is entered light guide plate inside by incidence surface, after the scattering of process diffusion point and the reflection of reflecting plate, by exiting surface light is penetrated.
This diffusion sheet group then is the overlapping exiting surface top that is positioned over, and each sheet diffusion sheet comprises a plate base, upper surface coating one deck optical diffusion layer of substrate, and its lower surface then is coating one deck back coating.Wherein back coating can enter substrate with ray guidance, and optical diffusion layer can and produce the light harvesting effect with the light diffusion above diffusion sheet, wherein, described diffusion sheet group comprises at least two diffusion sheets, and the bottom surface that wherein is positioned at the diffusion sheet of top contacts the end face of another diffusion sheet of its adjacent below.
When the exiting surface of light by light guide plate penetrates, after the light harvesting effect through the diffusion sheet above the light guide plate, the brightness of the backlight that it is exported is comparatively even, and its visual angle uses BEF III brightening piece wide, therefore the easier flat-panel screens safety standard that meets TCO 03.In addition, carry out light harvesting with one group of overlapping modes of emplacement of diffusion sheet, not only the light harvesting effect is good, and can effectively reduce the cost of backlight module, is difficult for surface because of diffusion sheet by scratch in the process of assembling, and influences yield.
Description of drawings
Fig. 1 is the type backlight module synoptic diagram that adds lustre to of prior art;
Fig. 2 A is a prior art BEF III brightening piece structural representation;
Fig. 2 B is the principle schematic of adding lustre to of prior art DBEF brightening piece;
Fig. 3 has the synoptic diagram of the backlight module of light harvesting function for the present invention;
Fig. 4 A implements illustration for the backlight module that the present invention is applied to two side light inlets;
Fig. 4 B is applied to the enforcement illustration of direct type backlight module for the present invention;
Fig. 5 is the diffusion and the light harvesting principle schematic of diffusion sheet of the present invention;
Fig. 6 A carries out the location drawing that brightness measures for the present invention for backlight module;
Fig. 6 B is the graph of a relation of the present invention for the quantity and the luminance gain value of diffusion sheet;
Fig. 7 A carries out synoptic diagram that brightness measure to liquid crystal panel for the present invention under different horizontal view angles;
Fig. 7 B carries out synoptic diagram that brightness measure to liquid crystal panel for the present invention under different verticals angle of view;
Table one is placed the diffusion sheet of varying number for the present invention above light guide plate, the backlight module that measures in the brightness results of diverse location.
The figure number explanation
10 backlight modules, 11 light guide plate, 111 exiting surfaces
112 incidence surfaces, 113 diffusions point, 12 light emitting sources
141 times diffusion sheets of 13 reflecting plates, 14 films
202 times polarizing board 30 backlight modules of polarizing board on 201
31 light guide plate, 311 exiting surfaces, 312 incidence surfaces
313 diffusions point, 32 light emitting sources, 33 diffusion sheets
331 substrates, 332 optical diffusion layers, 333 back coatings
334 transparent resins, 335 granule proliferations, 34 reflecting plates
Embodiment
See also shown in Figure 3ly, it has the synoptic diagram of the backlight module 30 of light harvesting function for the present invention, and backlight module 30 places the below of a liquid crystal panel 20 among the figure, and needed backlight when liquid crystal panel 20 show images are provided.
It is an end according to formula backlight module 30 that the present invention discloses, and it comprises that a light guide plate 31, a light emitting source 32 and three are one group diffusion sheet 33.Light guide plate 31 is the clapboard structure of a light-permeable, its material is based on acryl, wherein the upper surface of light guide plate 31 is an exiting surface 311 and corresponding with liquid crystal panel 20, the one side surface is an incidence surface 312, lower surface in light guide plate 31 then is to be formed with a plurality of diffusion points 313, and its below then is to be provided with reflecting plate 34.Light emitting source 32 adopts cold-cathode tubes mostly, and it also injects light guide plate 31 inside with light by incidence surface 312 in end face irradiation mode, and after the reflection through the scattering of diffusion point 313 and reflecting plate 34, light will be penetrated by exiting surface 311.Diffusion sheet 33 then is overlapping exiting surface 311 tops that are positioned over, because diffusion sheet 33 has the function of diffusion and light harvesting, therefore after the light of exiting surface 312 ejaculations was passing through above-mentioned diffusion sheet 33, not only the light harvesting effect was good for its backlight of exporting, and brightness is also comparatively even.In addition, adopt backlight module of the present invention, its visual angle uses BEF III brightening piece wide, therefore the easier flat-panel screens safety standard that meets TCO 03.And therefore the cost of diffusion sheet 33 will be more competitive on market far below existing employed combination.
See also shown in Fig. 4 A, the present invention also can be applied to the backlight module 30a of two side light inlets, wherein light guide plate is the slab construction of a light-permeable, its material is based on acryl, its exiting surface 311a is located at the upper surface of light guide plate 31a, its incidence surface 312a then is two side surfaces of being located at light guide plate 31a, therefore light emitting source 32a launches light into light guide plate 31a inside by the incidence surface 312a of two sides in end illumination light mode respectively, penetrate by exiting surface 311a after the reflection through the scattering of diffusion point 313a and reflecting plate 34a, utilize three to be that one group diffusion sheet 33 spreads and light harvesting again.
See also shown in Fig. 4 B, the present invention also can be applied to direct type backlight module 30b, wherein light guide plate 31b is the slab construction of a light-permeable, its material is based on acryl, its exiting surface 311b is located at the upper surface of light guide plate 31b, its incidence surface 312b then is a lower surface of being located at light guide plate 31b, so the light that light emitting source 32b is launched is directly entered by the incidence surface 312b of light guide plate 31b below, exiting surface 311b by light guide plate 31b top penetrates again, utilizes three to be that one group diffusion sheet 33 spreads and light harvesting again.
See also shown in Figure 5, it is for the diffusion of diffusion sheet 33 of the present invention and light harvesting principle schematic, employed diffusion sheet 33 is following diffusion sheets, yet the present invention is that example explains orally with the following diffusion sheet that Keiwa was produced, at present diffusion sheet 33 all is with PET, PC or the Polyester material as substrate 331, and at substrate 331 upper surfaces coating one deck optical diffusion layer 332.Its lower surface then is coating one deck back coating 333.Optical diffusion layer 332 and back coating 333 mainly are made up of transparent resin 334 and granule proliferation 335.Wherein the granule proliferation 335 of optical diffusion layer 332 is randomly distributed in transparent resin 334 inside, and the granule proliferation 335 of back coating 333 then is to be evenly distributed on the transparent resin 334.Back coating 33 can enter ray guidance substrate 331 inside, and after the diffusion of the granule proliferation 335 of process optical diffusion layer 332 inside, produces the light harvesting effect above diffusion sheet 33.Though different diffusion sheet 33 suppliers comprise Tsujiden, GE etc. perhaps can be different in the method for the shape of granule proliferation, manufacturing, utilizes the made diffusion sheet of this principle 33 all can reach the effect of similar diffusion and light harvesting.The use number of diffusion sheet 33 is decided according to actual situation about using, for example intensity of light source or panel size, but do not exceed with three.
Fig. 6 A carries out the location drawing that brightness measures for the present invention for backlight module 30, the choice of location that is measured is at the center of backlight module 30 and near four corners of backlight module 30, its purpose is that the result that brightness is measured is more representative, and the measurement condition is as follows:
A. light emitting source: the cold-cathode tube that adopts TOA company to be produced.
B. lamp current: 7.5mA.
C. diffusion sheet specification: the following diffuser plate of Keiwa BS-040.
D. reflective lampshade: ALSET E60V.
Table one is placed varying number for the present invention above light guide plate diffusion sheet quantity, the backlight module that measures in the brightness results of diverse location.Show under the situation of light guide plate from no diffusion sheet to four diffusion sheets of placement the brightness value that backlight module measures in the diverse location place in the table.
Fig. 6 B is the graph of a relation of the present invention for the quantity and the luminance gain value of diffusion sheet, and wherein yield value represents to have the brightness ratio that is measured when using diffusion sheet and not having the use diffusion sheet.By in the graph of a relation of Fig. 6 B as can be known, when the diffusion sheet placed more than three, can obtain good light harvesting effect.But consider the design of the mechanism of cost and backlight module, the present invention is a most preferred embodiment with three following diffusion sheets still, or upper and lower diffusion sheet combines, and in addition, the use number of diffusion sheet is decided according to actual situation about using, but does not exceed with three.
Fig. 7 A carries out synoptic diagram that brightness measure to liquid crystal panel for the present invention under different horizontal view angles.Fig. 7 B carries out synoptic diagram that brightness measure to liquid crystal panel for the present invention under different verticals angle of view.By among the figure as can be known, the present invention utilizes three to be the light enhancing effect that one group resulting light harvesting effect of following diffusion sheet and prior art utilize BEF III brightening piece to be produced, brightness ratio on difference little, but visual angle of the present invention uses BEF III brightening piece wide, therefore the easier flat-panel screens safety standard that meets TCO 03.
The more important thing is that the present invention does not have the generation of the folded line interference of shade, and uses three to be that diffusion sheet can significantly reduce cost under one group, not only source of goods does not have anxiety, and in the process of assembling, be difficult for because of under the scratch on diffusion sheet surface, and influence yield.
Claims (9)
1, a kind of backlight module with light harvesting function is characterized in that, described backlight module is made up of light guide plate, light emitting source and diffusion sheet group, wherein:
Described light guide plate has an incidence surface and an exiting surface, and wherein this exiting surface is corresponding with liquid crystal panel;
The light that described light emitting source is launched enters this light guide plate inside via this incidence surface, via this exiting surface light is penetrated again; And
Described diffusion sheet group, the overlapping exiting surface top that is positioned over this light guide plate, the light that penetrates of this exiting surface wherein, through after the light harvesting of above-mentioned diffusion sheet group, the output backlight, described diffusion sheet group comprises at least two diffusion sheets, and the bottom surface that wherein is positioned at the diffusion sheet of top contacts the end face of another diffusion sheet of its adjacent below.
2, the backlight module with light harvesting function as claimed in claim 1 is characterized in that, this incidence surface is located at one of this light guide plate side surface, and this light emitting source in end face irradiation mode, launches light into this light guide plate inside by this side surface.
3, the backlight module with light harvesting function as claimed in claim 1 is characterized in that, this incidence surface is located at two side surfaces of this light guide plate, and this light emitting source in end face irradiation mode, launches light into this light guide plate inside by above-mentioned two side surfaces.
4, the backlight module with light harvesting function as claimed in claim 1 is characterized in that, this incidence surface is located at the lower surface of this light guide plate, and this light emitting source is directly injected light guide plate inside by this lower surface.
5, the backlight module with light harvesting function as claimed in claim 1 is characterized in that, this light emitting source is a cold-cathode tube.
6, the backlight module with light harvesting function as claimed in claim 1 is characterized in that, this diffusion sheet comprises a plate base, its upper surface coating one deck optical diffusion layer, its lower surface coating one deck back coating.
7, the backlight module with light harvesting function as claimed in claim 6 is characterized in that, the material of this substrate is selected from one of PET, PC or three kinds of materials of Polyester.
8, the backlight module with light harvesting function as claimed in claim 6, it is characterized in that, this optical diffusion layer is made up of transparent resin and granule proliferation, and this granule proliferation is distributed in this transparent resin inside arbitrarily, and it is with the light diffusion and produce the light harvesting effect above this diffusion sheet.
9, the backlight module with light harvesting function as claimed in claim 6 is characterized in that, this back coating is made up of transparent resin and granule proliferation, and this granule proliferation is evenly distributed on this transparent resin, and it enters this substrate inside with ray guidance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100455766A CN100432778C (en) | 2004-06-07 | 2004-06-07 | Light background module with light collecting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100455766A CN100432778C (en) | 2004-06-07 | 2004-06-07 | Light background module with light collecting function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1584695A CN1584695A (en) | 2005-02-23 |
| CN100432778C true CN100432778C (en) | 2008-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100455766A Expired - Fee Related CN100432778C (en) | 2004-06-07 | 2004-06-07 | Light background module with light collecting function |
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| Country | Link |
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| CN (1) | CN100432778C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100409036C (en) * | 2005-05-27 | 2008-08-06 | 财团法人工业技术研究院 | Optical assembly and light source device |
| CN106054448A (en) * | 2016-06-12 | 2016-10-26 | 合肥工业大学 | Backlight module and liquid crystal display device |
| CN109001937A (en) * | 2018-01-23 | 2018-12-14 | 苏州东山新材料科技有限公司 | A kind of economical direct type backlight assembly |
| CN108873471A (en) * | 2018-06-28 | 2018-11-23 | Oppo广东移动通信有限公司 | Backlight module, display screen component and electronic equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6124971A (en) * | 1995-06-26 | 2000-09-26 | 3M Innovative Properties Company | Transflective displays with reflective polarizing transflector |
| JP2001311939A (en) * | 2000-04-28 | 2001-11-09 | Ricoh Co Ltd | Liquid crystal display device |
| JP2003161941A (en) * | 2001-09-14 | 2003-06-06 | Mitsubishi Electric Corp | Bi-planar liquid crystal display device and information equipment |
| CN1439959A (en) * | 2002-02-22 | 2003-09-03 | 友达光电股份有限公司 | Background module set of thin film liquid crystal display device |
| CN1466003A (en) * | 2002-07-05 | 2004-01-07 | Nec液晶技术株式会社 | LCD device |
| WO2004036300A1 (en) * | 2002-10-17 | 2004-04-29 | Sharp Kabushiki Kaisha | Display device and display device mounting device |
-
2004
- 2004-06-07 CN CNB2004100455766A patent/CN100432778C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6124971A (en) * | 1995-06-26 | 2000-09-26 | 3M Innovative Properties Company | Transflective displays with reflective polarizing transflector |
| JP2001311939A (en) * | 2000-04-28 | 2001-11-09 | Ricoh Co Ltd | Liquid crystal display device |
| JP2003161941A (en) * | 2001-09-14 | 2003-06-06 | Mitsubishi Electric Corp | Bi-planar liquid crystal display device and information equipment |
| CN1439959A (en) * | 2002-02-22 | 2003-09-03 | 友达光电股份有限公司 | Background module set of thin film liquid crystal display device |
| CN1466003A (en) * | 2002-07-05 | 2004-01-07 | Nec液晶技术株式会社 | LCD device |
| WO2004036300A1 (en) * | 2002-10-17 | 2004-04-29 | Sharp Kabushiki Kaisha | Display device and display device mounting device |
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| Publication number | Publication date |
|---|---|
| CN1584695A (en) | 2005-02-23 |
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