CN101526691A - Optical film material of lateral light type backlight module - Google Patents
Optical film material of lateral light type backlight module Download PDFInfo
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- CN101526691A CN101526691A CN200810083219A CN200810083219A CN101526691A CN 101526691 A CN101526691 A CN 101526691A CN 200810083219 A CN200810083219 A CN 200810083219A CN 200810083219 A CN200810083219 A CN 200810083219A CN 101526691 A CN101526691 A CN 101526691A
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Abstract
The invention relates to an optical film material, which is applied to a lateral light type backlight module. The lateral light type backlight module is provided with a light guide plate used for guiding a main light beam. The light guide plate is provided with a light-emitting face so as to define the direction of a normal. The optical film material comprises a lower prism structure, a middle medium layer and an upper prism structure. The lower prism structure is positioned on the light-emitting face. The middle medium layer is connected with the lower prism structure. The upper prism structure is connected with the middle medium layer, and the middle medium layer is positioned between the upper prism structure and the lower prism structure. When the main light beam is emitted out from the light-emitting face of the light guide plate and passes through the lower prism structure, the main light beam is along with the changed travel direction so as to pass through the middle medium layer. When the main light beam is emitted out from the middle medium layer and passes through the upper prism structure, the main light beam is approximately turned to the direction of the normal from the changed travel direction.
Description
Technical field
The present invention relates to a kind of optical film material, particularly relate to a kind of optical film material that is applied to side light type back light module.
Background technology
In the side light type back light module of mobile computer or display, regular meeting uses optical film material, and for example diffusion sheet, brightness enhancement film etc. are concentrated the effect that reaches the brightness lifting to reach light.
With reference to Fig. 1, existing side light type back light module 100 mainly by the brightness enhancement film 120 of last diffusion sheet 110, X axis, Y-axis to brightness enhancement film 130, diffusion sheet 140, light guide plate 150, reflector plate 160, light source 170, reflex housing 180 are formed with outside framework 190 down.Wherein upper and lower diffusion sheet 110 and 140 and optical film material such as brightness enhancement film 120 and 130 and light guide plate 150 be topmost technology and cost place.
As mentioned above, existing backlight module 100 must use two brightness enhancement film 120 and 130.But the someone proposes another kind of replacement scheme, is called the V-Cut technology.
With reference to Fig. 2, for using the backlight module 200 of V-Cut technology, it has diffusion sheet 220, inverse edge eyeglass (Reverse Prism sheet) 240 and light guide plate 260.The V-Cut technology mainly is with microstructure (not shown), directly is made in the upper surface or the lower surface of light guide plate 260, and with the inverse edge eyeglass 240 that a slice has class prism-like structure down, replaces two brightness enhancement film 120 shown in Figure 1 and 130.
As shown in Figure 2, from the light of light guide plate 260 outgoing, the time by inverse edge eyeglass 240, by the class prism-like structure of inverse edge eyeglass 240 lower surfaces, produce total reflection, make light outgoing vertically upward, by diffusion sheet 220, reach certain site screening effect and spread angle again.Compared to Figure 1, the V-Cut technology can reduce the use of brightness enhancement film 120,130 or upper and lower diffusion sheet 110,140, also saves cost, and can allow backlight module 200 more frivolous.
Yet backlight module manufacturer there's no one who doesn't or isn't tries every possible means and reduces cost, and the method that reduces cost is nothing more than being that the backlight module structure is simplified, to reduce the number of optical film material.The backlight module 200 of Fig. 2 still fails to integrate inverse edge eyeglass 240 and diffusion sheet 220, and expression cost and manufacturing door still have the space of reduction.
Summary of the invention
The object of the present invention is to provide the side light type back light module of an optical film material and applied optics film material, it can reduce the manufacturing cost of backlight module and simplify its number of assembling steps.
Other purpose of the present invention and advantage can be further understood from technical characterictic disclosed in this invention.
For reaching above-mentioned one or part or whole purposes or other purpose, embodiments of the invention are optical film material, are applied in the side light type back light module.Side light type back light module has light guide plate, is used to guide main beam.Light guide plate has light-emitting face, with the normal direction of definition vertical light exit facet.Optical film material comprises that prism structure, middle dielectric layer reach upward prism structure down.Following prism structure is positioned on the light-emitting face.Middle dielectric layer engages following prism structure, is positioned on the following prism structure.Last prism structure engages middle dielectric layer, is positioned on the middle dielectric layer, and wherein, middle dielectric layer and be continuously the entity of extension between upper and lower prism structure.When main beam is penetrated by the light-emitting face of light guide plate, and by after the prism structure down, main beam promptly along the direct of travel that is changed, passes through middle dielectric layer.When main beam is penetrated by middle dielectric layer, and by after the last prism structure, main beam is promptly roughly transferred to normal direction by the direct of travel that is changed.
Embodiments of the invention are side light type back light module, and it comprises above-mentioned optical film material, light guide plate and light source.Light guide plate is located at the below of the following prism structure of optical film material, and has light entrance face and light-emitting face.The light-emitting face of light guide plate is towards the following prism structure of optical film material.Light source is located at a side of the light entrance face of light guide plate.After light source penetrated main beam, main beam entered light guide plate by light entrance face earlier, and penetrated via light-emitting face, entered the following prism structure of optical film material again, and was penetrated by last prism structure.
In a preferred embodiment, following prism structure comprises a plurality of first prisms, and each first prism has drift angle, and its angle is between 30 degree are spent to 70.Last prism structure comprises a plurality of second prisms, and each second prism has drift angle, and its angle is between 70 degree are spent to 110.
In a preferred embodiment, the middle dielectric layer of optical film material also comprises mucigel and diffusant, and diffusant mixes with mucigel.Diffusant can be a plurality of shot-like particles.
In a preferred embodiment, each first prism of following prism structure is corresponding to one of the second different prism of last prism structure.
In a preferred embodiment, last prism structure comprises the corners structure, or random microstructure.
In sum, use the side light type back light module of optical film material of the present invention, can save the number of diffusion sheet, and do not influence brightness.
Description of drawings
Fig. 1 is the structural representation of existing side light type back light module;
Fig. 2 is the structural representation of another existing side light type back light module;
Fig. 3 is the side light type back light module synoptic diagram of one embodiment of the invention;
Fig. 4 A to Fig. 4 C is side light type back light module according to an embodiment of the invention, the synoptic diagram of its optical film material;
Fig. 5 is side light type back light module according to an embodiment of the invention, the light path synoptic diagram that its optical film material provided.
Embodiment
About aforementioned and other technology contents, characteristics and effect of the present invention, in DETAILED DESCRIPTION OF THE PREFERRED, can clearly present below in conjunction with accompanying drawing.The direction term of being mentioned in following examples, for example: upper and lower, left and right, front or rear etc. only are directions with reference to the accompanying drawings.Therefore, the direction term of use is to be used for illustrating not to be to be used for limiting the present invention.
With reference to Fig. 3, side light type back light module 300 comprises optical film material 320, light guide plate 340 and light source 360.Optical film material 320 has upper surface 322 and lower surface 324.Lower surface 324 is with respect to upper surface 322.Upper surface 322 is the surface of last prism structure 326.Lower surface 324 is the surface of following prism structure 328.Between last prism structure 326 and following prism structure 328, exist to engage the middle dielectric layer 321 of going up prism structure 326 and following prism structure 328, middle dielectric layer 321 is the entity that extends continuously.Light guide plate 340 is located at the below of the lower surface 324 of optical film material 320, and has light entrance face 342 and light-emitting face 344.Light-emitting face 344 is towards the following prism structure 328 of optical film material 320, and definition normal direction N, vertical light exit facet 344 (dotted line direction as shown).Light source 360 is located at a side of the light entrance face 342 of light guide plate 340.
Following prism structure 328 is to make main beam 400 to the normal direction N of the light-emitting face 344 of light guide plate 340 skew with the function of last prism structure 326.In the present embodiment, last prism structure 326 is positioned at liquid crystal panel (not shown) below.When main beam 400 is penetrated by light-emitting face 344, and by after the prism structure 328 down, main beam 400 is promptly along the direct of travel (as direction a or the direction b of Fig. 5) that is changed, by middle dielectric layer 321.When main beam 400 is penetrated by middle dielectric layer 321, and by after the last prism structure 326, main beam 400 is promptly roughly transferred to normal direction N by the direct of travel a or the b that are changed.In other words, when main beam 400 was penetrated by last prism structure 326, its direction was the normal direction N of almost parallel light-emitting face 344, that is main beam 400 can vertically be injected in this liquid crystal panel.Therefore, optical film material 320 can improve the brightness of liquid crystal panel, and guarantees the homogeneity of liquid crystal panel lightness.
In a preferred embodiment, following prism structure 328 comprises a plurality of first prism 328a.The shape of each first prism 328a can be triangle, has drift angle A, and between 70 degree, the spacing of two first adjacent prisms is 5um～1000um to its angle between 30 degree.Last prism structure 326 comprises a plurality of second prism 326a, and the shape of each second prism 326a can be triangle, has drift angle B, and between 110 degree, the spacing of two first prisms that it is adjacent is 5um～1000um to its angle between 70 degree.The first prism 328a and the second prism 326a have multiple possible configuration mode, and for example, each first prism 328a corresponds respectively to of different these second prisms 326a; Or the spacing of every adjacent two first prism 328a equals the spacing of every adjacent two second prism 326a.
In addition, last prism structure 326 or the following all available class prism structure of prism structure 328 or class pack-shot lens (macro lens) structure replace it.When the angle C of main beam 400 and light-emitting face 344 spends between 50 degree 10, particularly when angle C be 20 when spending, the direct of travel of main beam 400 is easier to by prism structure 328, middle dielectric layer 321 down and goes up prism structure 326 guide to parallel normal direction N.
The middle dielectric layer 321 of optical film material 320 can comprise mucigel 323 and diffusant 325, and diffusant mixes with mucigel.Subsidiary mentioning, the material of last prism structure 326 or following prism structure 328 can be PET or PC etc.Mucigel 323 can be UV glue.Diffusant 325 can adopt the shot-like particle of a plurality of organic or inorganics, and it can increase the spread angle and the site screening effect of main beam 400 to light uniformization.Be noted that, more than listed material only for reference, be not to be used to limit the present invention.
With reference to Fig. 4 A to Fig. 4 C, it is multi-form optical film material 320a, 320b, 320c.The optical film material 320a of Fig. 4 A comprises corners structure 326b, and the drift angle B passivation with last prism structure 326 shown in Figure 3 makes it have the function of diffusion sheet simultaneously.The optical film material 320b of Fig. 4 B also comprises microstructure 327a, is formed between the corners structure 326b, also can strengthen spreading the function of light.The optical film material 320c of Fig. 4 C also comprises random microstructure 326c, and it comprises the second prism 326a and corners structure 326b, and the microstructure 327b between the second prism 326a and corners structure 326b.In other embodiment, the second prism 326a of random microstructure 326c (not shown) and the permutation and combination of corners structure 326b and microstructure 327b are not limited, can be for being provided with at least one second prism 326a or corners structure 326b between two second prism 326a; Can also be for being provided with at least one second prism 326a or corners structure 326b between two corners structure 326b.And microstructure 327b can be between the second prism 326a and corners structure 326b; Between two second prism 326a; Or between two corners structure 326b.Random microstructure 326c can strengthen spreading the function of light, to reduce the demand of diffusion sheet.
The foregoing description has been integrated the function of diffusion sheet, brightness enhancement film to optical film material 320,320a, 320b and 320c, improves the front face brightness of side light type back light module 300.This diffusion sheet, the incorporate design of brightness enhancement film not only can be reduced used inverse edge eyeglass or diffusion sheet, and can shorten the built-up time of side light type back light module 300, reaches the purpose that improves brightness and reduce cost simultaneously.
With reference to Fig. 5, change with the angle of the angle C of C1 and C2 representative graph 3.When the angle between main beam 400 and the light-emitting face 344 was C1, after main beam 400 entered down prism structure 328, P1 advanced along light path.When the angle between main beam 400 and the light-emitting face 344 was C2, after main beam 400 entered down prism structure 328, P2 advanced along light path.As shown in Figure 5, main beam 400 enters down after the prism structure 328, and total reflection may take place, and also may only can reflect.
On light path P1, after main beam 400 enters down prism structure 328, through a unirefringence and a total reflection, will enter middle dielectric layer 321 with the direct of travel a that is changed, then pass through unirefringence again, enter prism structure 326 by middle dielectric layer 321, refraction again afterwards, in by after the last prism structure 326, main beam 400 is promptly roughly along the forward of optical film material 320, that is the normal direction N outgoing of light-emitting face 344 is to liquid crystal panel (not shown).
What deserves to be mentioned is, on light path P2, after main beam 400 enters down prism structure 328, through birefringence, will enter middle dielectric layer 321 with the direct of travel b that is changed, then pass through unirefringence again, enter prism structure 326 by middle dielectric layer 321, refraction again afterwards, in by after the last prism structure 326, main beam 400 also roughly along the forward outgoing of optical film material 320 to liquid crystal panel (not shown).
As shown in Figure 5, the main beam 400 of light guide plate 340 outgoing is reached the optimization incident angle that is incident to prism structure 326 via the total reflection or the refraction action of following prism structure 328, for example normal direction N and direct of travel a that is changed or the angle theta of b.By last prism structure 326, make the normal direction N skew of main beam 400, again to increase the brightness of liquid crystal panel towards light-emitting face 344.
Optical film material 320,320a, 320b, 320c can be applicable in the side light type back light module of mobile computer, LCD TV or LCD monitor etc., and it integrates existing diffusion sheet, brightness enhancement film and inverse edge eyeglass.Use the side light type back light module 300 of optical film material 320,320a, 320b, 320c, diffusion sheet that must be extra, brightness enhancement film or inverse edge eyeglass can not improve the forward brightness of liquid crystal panel.
Above-described, only be the preferred embodiments of the present invention, when not limiting scope of the invention process with this, promptly all simple equivalent of being done according to claim of the present invention and invention description content change and modify, and all still belong in the scope that patent of the present invention contains.Arbitrary embodiment of the present invention in addition or claim must not reached whole purpose disclosed in this invention or advantage or characteristics.In addition, summary part and title only are the usefulness that is used for assisting the patent document search, are not to be used for limiting interest field of the present invention.
Claims (18)
1, a kind of optical film material is used for side light type back light module, and described side light type back light module has the light guide plate that is used to guide main beam, and described light guide plate has light-emitting face, and to define the normal direction of vertical described light-emitting face, described optical film material comprises:
Following prism structure is positioned on the described light-emitting face;
Middle dielectric layer engages described prism structure down, is positioned on the described prism structure down; And
Last prism structure engages described middle dielectric layer, is positioned on the described middle dielectric layer, and wherein said middle dielectric layer and is the entity that extends continuously between described upper and lower prism structure;
Wherein work as of the described light-emitting face ejaculation of described main beam, and by after the described prism structure down, described main beam passes through described middle dielectric layer along the direct of travel that is changed by described light guide plate; When described main beam is penetrated by described middle dielectric layer, and go up after the prism structure by described, described main beam is roughly transferred to described normal direction by the described direct of travel that is changed.
2, optical film material as claimed in claim 1, wherein said prism structure down comprises a plurality of first prisms, and each described first prism has drift angle, and described drift angle is that 30 degree are between 70 degree.
3, optical film material as claimed in claim 1, the wherein said prism structure of going up comprises a plurality of second prisms, and each described second prism has drift angle, and described drift angle is that 70 degree are between 110 degree.
4, optical film material as claimed in claim 1, wherein said middle dielectric layer also comprises mucigel.
5, optical film material as claimed in claim 4, wherein said middle dielectric layer also comprises diffusant, described diffusant mixes with described mucigel.
6, optical film material as claimed in claim 5, wherein said diffusant are a plurality of shot-like particles.
7, optical film material as claimed in claim 1, wherein said prism structure down has a plurality of first prisms, and the described prism structure of going up has a plurality of second prisms, and each described first prism is corresponding to one of different described second prisms.
8, optical film material as claimed in claim 1, the wherein said prism structure of going up comprises the corners structure.
9, optical film material as claimed in claim 1, the wherein said prism structure of going up comprises random microstructure.
10, a kind of side light type back light module comprises:
Optical film material comprises
Following prism structure;
Middle dielectric layer engages described prism structure down, is positioned on the described prism structure down; And
Last prism structure engages described middle dielectric layer, is positioned on the described middle dielectric layer, and wherein said middle dielectric layer and is the entity that extends continuously between described upper and lower prism structure;
Light guide plate is located at the below of the described down prism structure of described optical film material, and is had light entrance face and light-emitting face, and wherein said light-emitting face is towards described prism structure down, and defines the normal direction of vertical described light-emitting face; And
Light source is located at a side of the described light entrance face of described light guide plate;
After described light source penetrates main beam, described main beam enters described light guide plate by described light entrance face earlier, and penetrates via described light-emitting face, then, after by described prism structure down, described main beam passes through described middle dielectric layer along the direct of travel that is changed; When described main beam is penetrated by described middle dielectric layer, and go up after the prism structure by described, described main beam is roughly transferred to described normal direction by the described direct of travel that is changed.
11, side light type back light module as claimed in claim 10, wherein said prism structure down comprises a plurality of first prisms, and each described first prism has drift angle, and described drift angle is that 30 degree are between 70 degree.
12, side light type back light module as claimed in claim 10, the wherein said prism structure of going up comprises a plurality of second prisms, and each described second prism has drift angle, and described drift angle is that 70 degree are between 110 degree.
13, side light type back light module as claimed in claim 10, wherein said middle dielectric layer also comprises mucigel.
14, side light type back light module as claimed in claim 13, wherein said middle dielectric layer also comprises diffusant, described diffusant mixes with described mucigel.
15, side light type back light module as claimed in claim 14, wherein said diffusant are a plurality of shot-like particles.
16, side light type back light module as claimed in claim 10, wherein said prism structure down has a plurality of first prisms, and the described prism structure of going up has a plurality of second prisms, and each described first prism is corresponding to one of different described second prisms.
17, side light type back light module as claimed in claim 10, the wherein said prism structure of going up comprises the corners structure.
18, side light type back light module as claimed in claim 10, the wherein said prism structure of going up comprises random microstructure.
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| CN200810083219A CN101526691A (en) | 2008-03-04 | 2008-03-04 | Optical film material of lateral light type backlight module |
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| CN200810083219A CN101526691A (en) | 2008-03-04 | 2008-03-04 | Optical film material of lateral light type backlight module |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8136975B2 (en) | 2008-01-17 | 2012-03-20 | Coretronic Corporation | Optical film applied to a side-emitting backlight module |
| CN104302966A (en) * | 2012-03-22 | 2015-01-21 | 大众汽车有限公司 | Optical element for a vehicle light |
| CN104456412A (en) * | 2014-12-23 | 2015-03-25 | 合肥鑫晟光电科技有限公司 | Optical film, backlight and display device |
| CN108241823A (en) * | 2016-12-23 | 2018-07-03 | 创智能科技股份有限公司 | Biometric recognition device.It |
| CN109212660A (en) * | 2018-10-26 | 2019-01-15 | 合肥京东方光电科技有限公司 | Leaded light component, light collimator assembly, backlight module and display device |
| CN110161758A (en) * | 2019-06-24 | 2019-08-23 | 京东方科技集团股份有限公司 | Light transformational structure, backlight module and virtual reality display device |
| WO2020078325A1 (en) * | 2018-10-19 | 2020-04-23 | Smart Liquid Crystal Technologies Co., Ltd. | Polarizing backlight unit, method of manufacturing the same and liquid crystal display device using the same |
| WO2022252736A1 (en) * | 2021-05-31 | 2022-12-08 | 惠州视维新技术有限公司 | Composite optical film and display device |
| WO2023115764A1 (en) * | 2021-12-21 | 2023-06-29 | 瑞仪(广州)光电子器件有限公司 | Optical film, optical film set, backlight module, and display device |
| US11960111B2 (en) | 2021-12-21 | 2024-04-16 | Radiant Opto-Electronics Corporation | Backlight for a display having an optical film with first and second prism structures disposed on opposing optical surfaces thereof, or backlight for a display having an optical film set with first and second prism structures disposed on opposing optical films |
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2008
- 2008-03-04 CN CN200810083219A patent/CN101526691A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8136975B2 (en) | 2008-01-17 | 2012-03-20 | Coretronic Corporation | Optical film applied to a side-emitting backlight module |
| CN104302966A (en) * | 2012-03-22 | 2015-01-21 | 大众汽车有限公司 | Optical element for a vehicle light |
| CN104302966B (en) * | 2012-03-22 | 2017-09-08 | 大众汽车有限公司 | Optical element for car light |
| CN104456412A (en) * | 2014-12-23 | 2015-03-25 | 合肥鑫晟光电科技有限公司 | Optical film, backlight and display device |
| CN108241823A (en) * | 2016-12-23 | 2018-07-03 | 创智能科技股份有限公司 | Biometric recognition device.It |
| WO2020078325A1 (en) * | 2018-10-19 | 2020-04-23 | Smart Liquid Crystal Technologies Co., Ltd. | Polarizing backlight unit, method of manufacturing the same and liquid crystal display device using the same |
| CN109212660A (en) * | 2018-10-26 | 2019-01-15 | 合肥京东方光电科技有限公司 | Leaded light component, light collimator assembly, backlight module and display device |
| CN109212660B (en) * | 2018-10-26 | 2020-01-24 | 合肥京东方光电科技有限公司 | Light guide assembly, light collimation assembly, backlight module and display device |
| CN110161758A (en) * | 2019-06-24 | 2019-08-23 | 京东方科技集团股份有限公司 | Light transformational structure, backlight module and virtual reality display device |
| WO2020259374A1 (en) * | 2019-06-24 | 2020-12-30 | 京东方科技集团股份有限公司 | Light conversion structure, backlight device, and virtual reality display device |
| CN110161758B (en) * | 2019-06-24 | 2022-04-05 | 京东方科技集团股份有限公司 | Light conversion structure, backlight module and virtual reality display device |
| WO2022252736A1 (en) * | 2021-05-31 | 2022-12-08 | 惠州视维新技术有限公司 | Composite optical film and display device |
| WO2023115764A1 (en) * | 2021-12-21 | 2023-06-29 | 瑞仪(广州)光电子器件有限公司 | Optical film, optical film set, backlight module, and display device |
| US11960111B2 (en) | 2021-12-21 | 2024-04-16 | Radiant Opto-Electronics Corporation | Backlight for a display having an optical film with first and second prism structures disposed on opposing optical surfaces thereof, or backlight for a display having an optical film set with first and second prism structures disposed on opposing optical films |
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Open date: 20090909 |