CN101178506A - Backlight module - Google Patents
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- CN101178506A CN101178506A CNA2006101447060A CN200610144706A CN101178506A CN 101178506 A CN101178506 A CN 101178506A CN A2006101447060 A CNA2006101447060 A CN A2006101447060A CN 200610144706 A CN200610144706 A CN 200610144706A CN 101178506 A CN101178506 A CN 101178506A
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Abstract
The invention provides a backlight module, which has a complex optical film to replace the diffuser and prismatic lens of the traditional backlight module in order to reduce optical membrane amount and manufacturing cost, and avoid the optical problem caused by air or static electricity.
Description
Technical field
The invention provides a kind of backlight module of panel display module, particularly a kind of backlight module with complex optical film.
Background technology
Because LCD has that external form is frivolous, power consumption is few and characteristic such as radiationless pollution, therefore be a kind of display device of day by day popularizing at present, individual desktop PC screen and notebook, personal digital assistant (personal digital assistant have been widely used in, PDA), on the portable type information products such as mobile phone, and replace cathode-ray tube (CRT) (Cathode Ray Tube, CRT) monitor and traditional tv gradually.
Please refer to Fig. 1, Fig. 1 is the decomposition diagram of a traditional LCD MODULE 10.As shown in Figure 1, LCD MODULE 10 includes a display panels 12, and is located at the reflector plate (reflecting sheet) 24 that the light guide plate 14, of display panels 12 belows is located at light guide plate 14 belows, and is located at first diffusion sheet 16, first prismatic lens 18, second prismatic lens 20 and second diffusion sheet 22 between light guide plate 14 and the display panels 12.In addition, LCD MODULE 10 comprises that also (light emitting diode LED) as sidelight source 26, is located at the side of light guide plate 14 to a plurality of light emitting diodes, needed light source when being used to provide display panels 12 display frames.The main effect of first diffusion sheet 16 is the further scattering of light, to provide display panels 12 more homodisperse light.Mainly the acting on optically focused and adjust the light travel angle of first prismatic lens 18 and second prismatic lens 20 to increase the brightness of LCD MODULE 10, and second diffusion sheet 22 can be revised the difference of briliancy power, and the light that display panel 12 is received can have a briliancy distribution uniformly.The function of reflector plate 24 then is in the light reflected back light guide plate 14 that light guide plate 14 bottoms are penetrated, to improve light utilization efficiency.Generally speaking, the combination in second diffusion sheet 22, first, second prismatic lens 18,20, first diffusion sheet 16, light guide plate 14, reflector plate 20 and sidelight source 26 is called backlight module 28 again, is used to provide display panels 12 backlights.In addition, LCD MODULE 10 also comprises a housing (figure does not show) usually, is used for fixing each assembly of display panels 12 and backlight module 28.
Fig. 2 shows the diagrammatic cross-section of light guide plate 14 shown in Figure 1, and wherein light guide plate 14 includes the bottom surface that a platysome 30 and a plurality of diffusion point 32 are located at platysome 30.One side of platysome 30 is incidence surface 30a, and sidelight source 26 is in close proximity to incidence surface 30a and is provided with, so sidelight source 26 light that produces can directly be injected in the light guide plate 14 by incidence surface 30a.When light is advanced in platysome 30, if march to the diffusion point 32 of platysome 30 bottom surfaces, then diffusion point 32 can change light going direction, make light further toward advancing away from the direction of incidence surface 30a, so that light can be spread in whole the platysome 30 more equably, last light can leave light guide plate 14 by the exiting surface 30b of light guide plate 14 and enter first diffusion sheet 16.Under the design of difference diffusion point 32, light is not quite alike by the rising angle meeting that exiting surface 30b leaves light guide plate 14, but a slice light guide plate 14 generally has a main rising angle δ, as shown in Figure 2.
Fig. 3 shows the local amplification profile synoptic diagram of first diffusion sheet 16 shown in Figure 1.First diffusion sheet 16 includes a base material 34, and its lower surface has a plurality of diffusion points 36, is used for changing the light course so that the light diffusion.Shown in light course among the figure, the light that is penetrated by light guide plate 14 enters first diffusion sheet 16 with incident angle δ, can change course through diffusion point 36 earlier, passes through base material 34 at last, leaves first diffusion sheet 16 with refraction angle γ again.Because the refractive index of general base material is all greater than the refractive index of air, so refraction angle γ is often bigger, for example greater than 45 degree.Tradition LCD MODULE 10 has preferred briliancy in order to make display frame, therefore first, second prismatic lens 18,20 need be set in addition on first diffusion sheet 16, to adjust the light travel angle, make when light further is incident to second diffusion sheet 22, small incident can be arranged, to allow the angle of incidence of light that enters display panels 12 at last maintain 10 degree between negative 10 degree, to provide briliancy uniform backlight.
Yet, in traditional backlight module 28, blooming piece storehouses such as thin as a wafer second diffusion sheet 22 of a plurality of layer thicknesses, first, second prismatic lens 18,20, first diffusion sheet 16 are together the time, be easy to take place the situation of similar wetting (wet out) phenomenon between each diaphragm because of static, have influence on the function and the light going direction of each diaphragm, and then can't improve even backlight and give display panels 10.Moreover because the air content between the multilayer optical film also can influence rising angle and angular distribution, therefore, industry still must be done further improvement to the structural design of traditional LCD MODULE 10, so that the backlight of better and homogenising to be provided.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of backlight module with complex optical film, to reduce the blooming piece quantity in the traditional backlight module, avoids influencing too much because of blooming piece quantity in the above-mentioned conventional art problem of display effect.
According to the present invention, a kind of backlight module is disclosed, it comprises that the light guide plate with an exiting surface, at least one light source be located at a side and one first complex optical film of light guide plate and be located on the exiting surface of light guide plate.First complex optical film includes a base material, a plurality of diffusion structure is located at a surface of base material and another surface that a plurality of prism structures are located at base material.Each prism structure has one first prism facets that is adjacent to this light source and away from one second prism facets of this light source.Wherein, second prism facets and substrate surface have an angle
And the refractive index of base material is n
Sub, the refractive index of prism structure is n
Pri, and the refraction angle that light leaves first complex optical film is predefined for γ, and light is θ, then angle by the incident angle that base material enters each prism structure
May be defined as:
Because the prism structure of complex optical film of the present invention has special angle design, therefore can have the light harvesting function of prismatic lens, and complex optical film also comprises diffusion structure, and light effectively is spread in whole the complex optical film.So complex optical film of the present invention can replace diffusion sheet and prismatic lens in the conventional art, effectively reduce the whole blooming piece quantity of backlight module, avoid causing too much effectively controlling out the problem of light effect because of blooming piece quantity, further also can reduce backlight module manufacturing cost and external form thickness, improve product competitiveness.
Description of drawings
Fig. 1 is the decomposition diagram of a traditional LCD MODULE.
Fig. 2 is the diagrammatic cross-section of light guide plate shown in Figure 1.
Fig. 3 is the local amplification profile synoptic diagram of first diffusion sheet shown in Figure 1.
Fig. 4 is the decomposition diagram of the present invention's one panel display module.
Fig. 5 is the side diagrammatic cross-section of first complex optical film shown in Figure 4.
Fig. 6 is the local enlarged diagram of first complex optical film shown in Figure 4.
Fig. 7 is the local enlarged diagram of the complex optical film of another embodiment of the present invention.
The primary clustering symbol description
10 LCD MODULE, 12 display panels
14 light guide plate, 16 first diffusion sheets
18 first prismatic lenses, 20 second prismatic lenses
22 second diffusion sheets, 24 reflector plates
26 sidelight sources, 28 backlight modules
30 platysome 30a incidence surfaces
30b exiting surface 32 diffusion points
34 base materials, 36 diffusion points
100 panel display modules, 102 display panels
104 light guide plate, 106 first complex optical films
108 second complex optical films, 110 light sources
112 reflector plates, 114 backlight modules
116 base material 116a incidence surfaces
120 prism structure 120a, first prism facets
The 120b second prism facets 120c concave plane
122 complex optical films
Embodiment
Please refer to Fig. 4, Fig. 4 is the decomposition diagram of panel display module 100 of the present invention.Panel display module 100 of the present invention includes the back side that a display panels 102 and a backlight module 114 are located at display panels 102.Backlight module 114 comprises in regular turn that from the bottom to top a reflector plate 112, a light guide plate 104, one first complex optical film 106, one second complex optical film 108 and at least one light source 110 be located at the side of light guide plate 104.Wherein, the upper surface of light guide plate 104 is its exiting surface, and light is injected after the light guide plate 104 by light source 110, can leave by the upper surface of light guide plate 104, enter among first complex optical film 106, enter display panels 102 through second complex optical film 108 again, with display frame.In addition, light guide plate 104 lower surfaces have a plurality of diffusion points (figure does not show), along with distance light source 110 distances different density or pattern are arranged, and light source 110 are preferably led light source.
It should be noted that, have too many diaphragm and produce wetting phenomena or influence light rising angle and uniformity coefficient for reducing in the aforementioned conventional technology backlight module because of static or air, therefore the present invention combines the diffusion sheet in the conventional art with prismatic lens, and replace with complex optical film, avoid the problems referred to above to reduce diaphragm quantity.For example, first complex optical film 106 in the backlight module 114 of the present invention promptly is used for replacing first diffusion sheet 16 of traditional LCD MODULE 10 shown in Figure 1 and first prismatic lens, 18, the second complex optical films 108 and then replaces second prismatic lens 20 and second diffusion sheet 22 among Fig. 1.Because first and second complex optical film 106,108 must possess the function of diffusion sheet and prismatic lens simultaneously, so the end face of first and second complex optical film 106,108 and the pattern that the bottom surface all has difference in functionality, and must special figure and the angle that designs each pattern.Below will illustrate with first complex optical film 106.
Please refer to Fig. 5, Fig. 5 is the side diagrammatic cross-section of first complex optical film 106 shown in Figure 4.First complex optical film 106 includes a base material 116, and its lower surface is adjacent to light guide plate 104 for incidence surface 116a, and the surface has a plurality of diffusion structures 118, and upper surface is exiting surface 116b, and with respect to incidence surface 116a, the surface has a plurality of prism structures 120.Diffusion structure 118 is generally the site with diffusion function, and pattern can be circle, triangle and any geometric figure, and it has the function that general diffusion sheet changes the light course and makes the light diffusion.Prism structure 120 adjustable light rising angles are to provide preferred rising angle and briliancy.In the present invention, base material 116 can be by tens of polyester (polyester to hundreds of micron thickness, PET), polycarbonate (polycarbonate, PC) or polymethylmethacrylate (PolyMethylmethacrylate, PMMA) etc. the base material that has light peneration matter constitutes, and diffusion structure 118 and prism structure 120 all can (ultraviolet, UV) moulding material such as glue constitute by thermoset material or ultraviolet light.Its method for making is the moulding material of coating on planar substrate 116, have with respect to the cylinder of the pattern of diffusion structure 118 or prism structure 120 or be molded to moulding material surface pressure system by the surface again and form diffusion structure 118 or prism structure 120, then via heating or irradiating ultraviolet light and finalize the design.
Please refer to Fig. 6, Fig. 6 is the local enlarged diagram of first complex optical film 106 shown in Figure 5.In the present embodiment, the material of the base material 116 of first complex optical film 106 is PET, and the material of prism structure 120 is the ultraviolet optical cement, and each prism structure 120 includes one first prism facets 120a and one second prism facets 120b, wherein the first prism facets 120a is the prism facets that is adjacent to light source 110, and the second prism facets 120b is the prism facets away from light source 110, and the side section of both and base material 116 upper surfaces forms non-isosceles triangle.Suppose that by light guide plate 104 irradiant rising angles be δ, then the light incident angle that enters first complex optical film 106 also is δ, and the refraction angle in base material 116 is θ.Therefore, according to Si Nieer (Snell) law, can obtain following formula:
n
air×sinδ＝n
sub?×sinθ (1)
" n wherein
Air" the expression air refraction, and " n
Sub" refractive index of expression base material 116, and when the material of base material 116 is PET, then with " n
PET" expression.
Then, when light marched to prism structure 120 by base material 116, incident angle was θ, and the refraction angle in the prism structure 120 is θ ', and it is as follows to obtain formula:
n
sub×sinθ＝n
pri×sinθ’ (2)
N wherein
PriThe refractive index of expression prism structure 120 is when prism structure 120 is constituted by the ultraviolet optical cement, with n
UVExpression can obtain n
PET* sin θ=n
UV* sin θ '.In prism structure 120, light can continue toward advancing away from the direction of light source 110, and leaves second complex optical film 106 by the second prism facets 120b of prism structure 120, and wherein to leave the rising angle (being the refraction angle) of the second prism facets 120b be γ to light.In order to make rising angle γ have 10 optimized angles, therefore the invention provides design prism structure angle to negative 10 degree
Method.As shown in Figure 6, prism structure angle
Be defined as the angle on the second prism facets 120b and base material 116 surfaces.Because the refraction angle γ that light penetrates the second prism facets 120b is necessary for optimized angle, so refraction angle γ can be considered known, for example is 10 degree; And incident angle
Can obtain following formula according to Snell's law:
Then, utilize trigonometric function with the difference formula, again formula (1), formula (2) are brought into, just can obtain the prism structure angle
And
For example, if the main rising angle δ of light guide plate 104 is 70 degree, and wish that by first complex optical film, 106 irradiant rising angle γ be 10 degree, then deducibility prism structure angles
Be necessary for tan
-1((n
AirSin70 °-sin10 °)/(n
PriCos θ '-cos10 °)), so just can design better suited prism structure angle.
Yet, when marching to the diffusion structure 118 of first complex optical film 106, light also can be changed course and the angle that enters base material 116 by diffusion structure 118, so actual design prism structure angle
The time, must consider in addition via the incident angle of light after diffusion structure 118 effects.In the preferred embodiment of the present invention, the incident angle δ (the perhaps luminous exitance angle of light guide plate 104) that light enters first complex optical film 106 is preferably 25 to 70 degree, and the prism structure angle
Being preferably 35 to 75 degree, so that light leaves the rising angle γ of first complex optical film 106 is less, is 10 degree or negative 10 degree, and as shown in Figure 5, this design can improve the briliancy of backlight module 114 backlight that produces.
Please refer to Fig. 7, Fig. 7 is the local enlarged diagram of section of the complex optical film 122 of another embodiment of the present invention.For ease of explanation, each assembly is all continued to use the element numbers of Fig. 5.In the present embodiment, complex optical film 122 comprises a base material 116, and its upper surface has a plurality of prism structures 120, and lower surface has a plurality of diffusion structures 118.Each prism structure 120 includes one first prism facets 120a and one second prism facets 120b respectively.In addition, have a concave plane 120c, can change the light route, improve briliancy to dwindle the light beam angle, shown in opticpath L at the first prism facets 120a and one second prism facets 120b intersection.Moreover in other embodiments, the structure of prism structure 120 can be rhombus, circle or curved-surface structure.On the other hand, 118 of diffusion structures can be the particle with diffusion property, and its profile can be circle, square or irregular shape, also can be recessed base material 116 surfaces or protrude from the patterning on base material 116 surfaces.In other embodiments, the prism structure 120 on base material 116 surfaces is also incomplete same, for example size dimension, shape or density are not just the same, may cooperate the rising angle of light guide plate 104, and each prism structure 120 can have different different prism structure angles yet
Similarly, each diffusion structure 118 also may have different sizes, shape and density.
Similarly, the present invention's second complex optical film 108 has a base material equally, and comprise that diffusion structure and prism structure be located at the exiting surface and the incidence surface of its base material respectively, to have the function of diffusion sheet and prismatic lens simultaneously, its prism structure design class is similar to first complex optical film 106, does not repeat them here.
Compared to conventional art, because complex optical film of the present invention can replace diffusion sheet and prismatic lens in the traditional backlight module, therefore can effectively reduce the monolithic film membrane quantity of backlight module, avoid problems such as wetting phenomena in traditional LCD MODULE or rising angle be inhomogeneous, uncontrollable.In addition,, can dwindle the light rising angle, effectively improve the briliancy of backlight, and then promote the image effect of LCD MODULE according to prism structure method for designing provided by the present invention.
The above only is the preferred embodiments of the present invention, and is all according to equalization variation and modification that the present invention did, all should belong to covering scope of the present invention.
Claims (14)
1. backlight module, it comprises:
One light guide plate, it has an exiting surface;
At least one light source is located at a side of this light guide plate; And
One first complex optical film is located on this exiting surface of this light guide plate, and this first complex optical film includes:
One base material, it has the incidence surface that is adjacent to this light guide plate and with respect to an exiting surface of this incidence surface;
A plurality of diffusion structures are located at a surface of this base material; And
A plurality of prism structures are located at another surface of this base material, and respectively this prism structure has one first prism facets and is adjacent to this light source and one second prism facets away from this light source;
Wherein, respectively this second prism facets and this substrate surface have an angle
The refractive index of this base material is n
Sub, the refractive index of these prism structures is n
Pri, and the refraction angle that light leaves this first complex optical film is predefined for γ, and light is θ, then angle by the main incident angle that this base material enters these prism structures
May be defined as:
2. backlight module according to claim 1, wherein these diffusion structures are positioned at this incidence surface surface of this base material.
3. backlight module according to claim 1, wherein these prism structures are positioned at this exiting surface surface of this base material.
4. backlight module according to claim 1, wherein light is δ from the main incident angle that this light guide plate enters this complex optical film, then this angle
May be defined as
5. backlight module according to claim 1, wherein to be predefined for γ be that 10 degree are to negative 10 degree at this refraction angle.
6. backlight module according to claim 1, wherein this angle
Be that 35 degree are to 75 degree.
7. backlight module according to claim 1, wherein, a surface of this first, second prism facets and this base material forms a triangle side section, and respectively this triangle side section is isosceles triangle not.
8. backlight module according to claim 1, wherein respectively this angle of these prism structures
Incomplete same.
9. backlight module according to claim 1, wherein this backlight module also comprises one second complex optical film, it comprises:
One base material, it has an incidence surface and an exiting surface;
A plurality of prism structures are located at this incidence surface surface of this base material; And
A plurality of diffusion structures are located at this exiting surface surface of this base material.
10. backlight module according to claim 1, wherein these diffusion structures are formed by a plurality of diffusion particle.
11. backlight module according to claim 1, wherein these prism structures are rhombus, circle or curved-surface structure.
12. backlight module according to claim 1, wherein the surface of these prism structures has concave plane.
13. backlight module according to claim 1, it also comprises a reflector plate, is located at the side of this light guide plate in contrast to this first complex optical film.
14. a panel display module, it comprises:
A backlight module according to claim 1, and
One display panels is located at a side of this backlight module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101447060A CN101178506A (en) | 2006-11-07 | 2006-11-07 | Backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101447060A CN101178506A (en) | 2006-11-07 | 2006-11-07 | Backlight module |
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| Publication Number | Publication Date |
|---|---|
| CN101178506A true CN101178506A (en) | 2008-05-14 |
Family
ID=39404816
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| CNA2006101447060A Pending CN101178506A (en) | 2006-11-07 | 2006-11-07 | Backlight module |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062891A (en) * | 2010-11-01 | 2011-05-18 | 李明伟 | Composite bright enhancement film |
| CN102478682A (en) * | 2010-11-23 | 2012-05-30 | 玉晶光电股份有限公司 | Light guide module |
| CN102809774A (en) * | 2011-06-03 | 2012-12-05 | 群康科技(深圳)有限公司 | Optical film and liquid crystal display device using same |
| CN102818219A (en) * | 2011-06-09 | 2012-12-12 | 奇美电子股份有限公司 | Optical membrane and manufacturing method thereof as well as liquid crystal display device using same |
| CN103513307A (en) * | 2012-06-29 | 2014-01-15 | 常州华威新材料有限公司 | Brightness enhancement film matched with flat-panel displayer and manufacturing method thereof |
| US8730432B2 (en) | 2011-06-03 | 2014-05-20 | Innocom Technology (SHENZHEN) Co. Ltd. | Optical film and method for manufacturing the same and liquid crystal display device using the same |
| CN107991725A (en) * | 2018-01-29 | 2018-05-04 | 京东方科技集团股份有限公司 | A kind of prism, backlight source module and display device |
| CN111665591A (en) * | 2020-06-29 | 2020-09-15 | 武汉华星光电技术有限公司 | Light guide plate, backlight module and liquid crystal display module |
| WO2021238906A1 (en) * | 2020-05-27 | 2021-12-02 | 京东方科技集团股份有限公司 | Backlight structure and lcd display module |
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2006
- 2006-11-07 CN CNA2006101447060A patent/CN101178506A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062891B (en) * | 2010-11-01 | 2012-05-23 | 李明伟 | Composite bright enhancement film |
| CN102062891A (en) * | 2010-11-01 | 2011-05-18 | 李明伟 | Composite bright enhancement film |
| CN102478682B (en) * | 2010-11-23 | 2015-01-21 | 玉晶光电股份有限公司 | Light guide module |
| CN102478682A (en) * | 2010-11-23 | 2012-05-30 | 玉晶光电股份有限公司 | Light guide module |
| US8687937B2 (en) | 2010-11-23 | 2014-04-01 | Genius Electronic Optical Co., Ltd. | Light-guide module |
| CN102809774A (en) * | 2011-06-03 | 2012-12-05 | 群康科技(深圳)有限公司 | Optical film and liquid crystal display device using same |
| CN102809774B (en) * | 2011-06-03 | 2015-02-11 | 群康科技(深圳)有限公司 | Optical film and liquid crystal display device using same |
| US8730432B2 (en) | 2011-06-03 | 2014-05-20 | Innocom Technology (SHENZHEN) Co. Ltd. | Optical film and method for manufacturing the same and liquid crystal display device using the same |
| CN102818219A (en) * | 2011-06-09 | 2012-12-12 | 奇美电子股份有限公司 | Optical membrane and manufacturing method thereof as well as liquid crystal display device using same |
| CN102818219B (en) * | 2011-06-09 | 2015-02-18 | 群创光电股份有限公司 | Optical membrane and manufacturing method thereof as well as liquid crystal display device using same |
| CN103513307A (en) * | 2012-06-29 | 2014-01-15 | 常州华威新材料有限公司 | Brightness enhancement film matched with flat-panel displayer and manufacturing method thereof |
| CN107991725A (en) * | 2018-01-29 | 2018-05-04 | 京东方科技集团股份有限公司 | A kind of prism, backlight source module and display device |
| CN107991725B (en) * | 2018-01-29 | 2020-03-06 | 京东方科技集团股份有限公司 | Prism, backlight module and display device |
| US10948634B2 (en) | 2018-01-29 | 2021-03-16 | Beijing Boe Display Technology Co., Ltd. | Prism sheet, backlight module and display device |
| WO2021238906A1 (en) * | 2020-05-27 | 2021-12-02 | 京东方科技集团股份有限公司 | Backlight structure and lcd display module |
| CN111665591A (en) * | 2020-06-29 | 2020-09-15 | 武汉华星光电技术有限公司 | Light guide plate, backlight module and liquid crystal display module |
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