CN108761628A - A kind of optical diaphragm for light guide plate - Google Patents
A kind of optical diaphragm for light guide plate Download PDFInfo
- Publication number
- CN108761628A CN108761628A CN201810561323.6A CN201810561323A CN108761628A CN 108761628 A CN108761628 A CN 108761628A CN 201810561323 A CN201810561323 A CN 201810561323A CN 108761628 A CN108761628 A CN 108761628A
- Authority
- CN
- China
- Prior art keywords
- guide plate
- light guide
- pattern
- optical diaphragm
- prism columns
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
Abstract
The present invention proposes a kind of optical diaphragm for light guide plate, the optical diaphragm is attached at the side of pattern-free light guide plate, the optical diaphragm includes transparent base material film, the prism columns that multiple cross sections arranged in parallel are isosceles trapezoid are formed on the base material film, wherein more it is proximate to the place of LED light source, the density of prism columns is bigger, the place far from LED light source, and the density of prism columns is smaller.In the case that the optical diaphragm for light guide plate of the above structure of the present invention provides a kind of structure not having to the existing pattern-free light guide plate of change, by the optical diaphragm for attaching the specific pattern structure with the present invention in pattern-free light guide plate surface, form the backlight for having and making whole display brightness uniformity, the non-uniform defect of LCD brightness can be eliminated, make the technical solution of light guide plate pattern compared with the existing technology, the present invention can reduce assembly operation, production cost is saved, and display effect can be improved.
Description
Technical field
The present invention relates to a kind of optical diaphragms that can be used in LCD backlight module more particularly to one kind can be used for
The optical diaphragm of light guide plate.
Background technology
In liquid crystal display (Liquid Crystal Display, LCD) backlight module, usually using plurality of LEDs point
Light source is distributed in the side of light guide plate according to linear array or more sides provide illumination.Due to the hair of LED point light source itself
The factor of distance between angular and adjacent LED penetrates into part hair close from LED point light source in the light outside light guide plate
Bright, remote from LED point light source part obfuscation, therefore entire liquid crystal display will present the effect of brightness irregularities.
Prior art generally use makes the scheme of light guide plate pattern realize uniform brightness, for example, CN104272011A
In existing light guide plate pattern technology is described in detail, the light guide plate pattern scheme referred in the prior art
Include using below light guide plate in the illumination backlight module of side or above, using print or laser formation mode formed can be anti-
The pattern for penetrating incident light, to provide the backlight for making whole display brightness uniformity, these are formed by printing or laser formation
In pattern, the pattern of the part close from LED point light source less, depth it is more shallow, the figure of the part remote from LED point light source
Case is denser, depth is deeper.
But this light guide plate pattern scheme in the prior art needs higher processing technology, and printing or laser
Under forming operation low output, production and assembly cost are high, can not provide high-quality light guide plate, it is easy to since light guide plate generates not
It is good and cause display effect reduce and display cost rising.
Invention content
The technical problem to be solved in the present invention is to provide a kind of optical diaphragms for light guide plate, front is reduced or avoided
The problem of being previously mentioned.
Specifically, the technical problem to be solved in the present invention is to provide a kind of optical diaphragm for light guide plate, Ke Yi
Under the premise of the structure for not changing existing pattern-free light guide plate, by the surface that the optical diaphragm is attached to pattern-free light guide plate
Make outgoing equalizing light rays, eliminate the non-uniform defect of LCD brightness, save production and assembly cost, improves display effect
Fruit.
In order to solve the above technical problems, the present invention proposes a kind of optical diaphragm for light guide plate, the optical diaphragm
It is attached at the side of the pattern-free light guide plate of the backlight module of liquid crystal display, the optical diaphragm includes transparent base material film,
The prism columns that multiple cross sections arranged in parallel are isosceles trapezoid are formed on the base material film, the pattern-free light guide plate is vertical
At least one side of the length direction of the prism columns is provided with LED light source, the cross section of the prism columns it is described etc.
The length of side of the upper bottom edge of the waist trapezoidal adjoining base material film is a, and the length of side of the bottom far from the base material film is b, wherein a>
b；It is characterized in that, the optical diaphragm is bonded in the side of the pattern-free light guide plate by adhesive layer；The adhesive layer by
Thermmohardening type or ultraviolet ray hardening type polymer are constituted；The coefficient of thermal expansion of the pattern-free light guide plate is less than the prism columns
Coefficient of thermal expansion, the coefficient of thermal expansion of the prism columns are less than the coefficient of thermal expansion of the adhesive layer；Close to the LED light source
Spacing between the adjacent prism columns is more than the spacing between the adjacent prism columns far from the LED light source；It is described etc.
The angle α of the trapezoidal waist of waist and the straight line perpendicular to the upper bottom edge is 25 to 50 degree；The prism columns are by ultraviolet ray hardening type
Polymer is constituted.
The optical diaphragm for light guide plate of the above structure of the present invention provides one kind and is led without changing existing pattern-free
In the case of the structure of tabula rasa, by the optical film for attaching the specific pattern structure with the present invention in pattern-free light guide plate surface
Piece forms the backlight for having and making whole display brightness uniformity, can eliminate the non-uniform defect of LCD brightness, phase
Make the technical solution of light guide plate pattern, the present invention that can reduce assembly operation for the prior art, save production cost,
And display effect can be improved.
Description of the drawings
The following drawings are only intended to schematically illustrate and explain the present invention, not delimit the scope of the invention.Wherein,
The structural representation of the optical diaphragm for light guide plate of a specific embodiment according to the present invention is shown in Fig. 1
Figure；
Fig. 2 shows the enlarged cross sectional views of the prism columns of a specific embodiment according to the present invention.
Specific implementation mode
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control illustrates this hair
Bright specific implementation mode.Wherein, identical component uses identical label.
It is produced based on making the patterned scheme of light guide plate surface exist using printing or laser formation mode in the prior art
With assembly cost it is high, high-quality light guide plate can not be provided, be easy to cause display cost since light guide plate generates bad
Rise, the defect that display effect reduces, the present invention provides a kind of optical diaphragm suitable for pattern-free light guide plate, the optical films
Piece can be under the premise of not changing the structure of existing pattern-free light guide plate, by the way that the optical diaphragm is attached to pattern-free leaded light
The surface of plate makes outgoing equalizing light rays.
The structural representation of the optical diaphragm for light guide plate of a specific embodiment according to the present invention is shown in Fig. 1
Figure, the optical diaphragm 1 are attached at the side of the pattern-free light guide plate 2 of the backlight module (not shown) of liquid crystal display,
Such as in a specific embodiment shown in Fig. 1, the optical diaphragm 1 is bonded in the side of pattern-free light guide plate 2 by adhesive layer 3
Face.Certainly, it will be appreciated by those skilled in the art that the optical diaphragm 1 can be attached to pattern-free light guide plate 2 as shown in the figure
Beam projecting face can also be attached at the plane of light incidence of pattern-free light guide plate 2, or can be the two of pattern-free light guide plate 2
A side (plane of light incidence and beam projecting face) attaches the optical diaphragm 1 of the present invention.
The optical diaphragm 1 includes transparent base material film 11, and multiple cross sections arranged in parallel are formed on base material film 11
For the prism columns 12 of isosceles trapezoid, pattern-free light guide plate 2 is arranged perpendicular at least one side of the length direction of prism columns 12
There is LED light source 4, wherein the spacing between the adjacent prisms column 12 of LED light source 4 is more than the adjacent ribs far from LED light source 4
Spacing between mirror column 12.Further, the upper bottom edge of the isosceles trapezoid adjoining base material film 11 of the cross section of prism columns 12
The length of side be a, the length of side of the bottom far from the base material film 11 is b, wherein a>B, that is, prism columns 12 are close to pattern-free
The top surface of that side of light guide plate 2 is small, and the top surface close to that side of base material film 11 is big.
In addition, for example, in a specific embodiment shown in Fig. 1, length of the pattern-free light guide plate 2 perpendicular to prism columns 12
Two sides in degree direction are both provided with LED light source 4, then from the LED light source of both sides 4 to intermediate direction, are more proximate to LED light source
The density in 4 place, prism columns 12 is bigger, that is, the spacing between adjacent prisms column 12 is bigger, far from LED light source 4
Place, the density of prism columns 12 is smaller, that is, the spacing between adjacent prisms column 12 is smaller.
It certainly, can also be only vertical in pattern-free light guide plate 2 it will be appreciated by those skilled in the art that according to actual needs
LED light source 4 is set in a side of the length direction of prism columns 12, is then remote from LED light source 4 to it in this case
Extreme direction is more proximate to the place of LED light source 4, and the density of prism columns 12 is bigger, that is, the spacing between adjacent prisms column 12
Bigger, the place far from LED light source 4, the density of prism columns 12 is smaller, that is, the spacing between adjacent prisms column 12 is got over
It is small.
The optical diaphragm for light guide plate of the above structure of the present invention provides one kind and is led without changing existing pattern-free
In the case of the structure of tabula rasa, by the optical film for attaching the specific pattern structure with the present invention in pattern-free light guide plate surface
Piece forms the backlight for having and making whole display brightness uniformity, can eliminate the non-uniform defect of LCD brightness, phase
Make the technical solution of light guide plate pattern, the present invention that can reduce assembly operation for the prior art, save production cost,
And display effect can be improved.
Further, as shown in Fig. 2, which show the cross sections of the prism columns of a specific embodiment according to the present invention
Enlarged drawing, in the present embodiment, the length of side a of the isosceles trapezoid of the cross section of prism columns 12 is less than 100 μm, and side length b is more than 2 μm, etc.
The angle α of the trapezoidal waist of waist and the straight line perpendicular to upper bottom edge is 25 to 50 degree.The present embodiment is using isosceles trapezoid cross section
Prism columns 12 are since it is desired that prism columns 12 are attached on pattern-free light guide plate 2, and the side contacted with pattern-free light guide plate 2 needs
Have that certain area could stablize is combined with pattern-free light guide plate 2, therefore is set side length b and be at least greater than 2 μm.Separately
Outside, since human eye cannot identify that width is less than 150 μm of fringe spacing, setting length of side a, which is less than 100 μm, can make viewer
The specific shape structure that cannot identify the present invention, so as to provide display effect evenly.Especially, angle α be 25 to
50 degree of light characteristics that front can be made to send out are fitst water, can improve the display quality of display.
The specific parameter that the above-mentioned specific embodiment of the present invention provides the isosceles trapezoid of the cross section of prism columns 12 is closed
System can be used for obtaining above-mentioned parameter relationship without any technical inspiration in the prior art, and those skilled in the art are according to this
Parameters relationship can obtain better display effect, under the premise of no above-mentioned parameter relationship is as enlightening, art technology
Personnel can not know which type of experiment just can get above-mentioned parameter relationship, therefore, above-mentioned specific embodiment of the invention using
The parameters relationship provided for a person skilled in the art right and wrong it will be apparent that have substantive distinguishing features outstanding and significantly
Progress, have the creativeness on patent law purposes.
In order to further obtain better processing characteristics and display effect, in a preferred embodiment, optical diaphragm 1 is logical
Cross the side that adhesive layer 3 is bonded in pattern-free light guide plate 2；Adhesive layer 3 is preferably by thermmohardening type or ultraviolet ray hardening type polymer
It constitutes.
For the purposes of further obtaining better processing characteristics and display effect, in a preferred embodiment, base material film
11 are made of PET, PP or PC plastic；Prism columns 12 are made of thermmohardening type or ultraviolet ray hardening type polymer.In the present embodiment
In, prism columns 12 can be formed in by conventional hot-forming or ultraviolet light molding on base material film 11.
Because heat or water grading factors deform when being combined in order to avoid optical diaphragm, in a preferred embodiment,
The coefficient of thermal expansion that pattern-free light guide plate 2 can be limited is less than the coefficient of thermal expansion of prism columns 12, the thermal expansion system of prism columns 12
Number obtains more stable firm integrated structure less than the coefficient of thermal expansion of adhesive layer 3 with this.
In addition, being based on aforementioned detailed description, the present invention can also provide a kind of liquid crystal display having above-mentioned optical diaphragm
Device backlight module, specifically, as shown in Figure 1, the backlight module of the present invention may include pattern-free light guide plate 2 and front
The optical diaphragm 1 of the combination form of described any one specific example or arbitrary several examples, the optical diaphragm 1 attach
In the side of the pattern-free light guide plate 2 of the backlight module of liquid crystal display.
It will be appreciated by those skilled in the art that although the present invention is described in the way of multiple embodiments,
It is that not each embodiment only contains an independent technical solution.So narration is used for the purpose of for the sake of understanding in specification,
The skilled in the art should refer to the specification as a whole is understood, and by technical solution involved in each embodiment
Regard as and can be combined with each other into the mode of different embodiments to understand protection scope of the present invention.
The foregoing is merely the schematical specific implementation modes of the present invention, are not limited to the scope of the present invention.It is any
Those skilled in the art, do not depart from the design of the present invention and under the premise of principle made by equivalent variations, modification and combination,
The scope of protection of the invention should all be belonged to.
Claims (1)
1. a kind of optical diaphragm for light guide plate, the optical diaphragm (1) is attached at the nothing of the backlight module of liquid crystal display
The side of pattern light guide plate (2), the optical diaphragm (1) include transparent base material film (11), are formed on the base material film (11)
It is the prism columns (12) of isosceles trapezoid to have multiple cross sections arranged in parallel, and the pattern-free light guide plate (2) is perpendicular to the rib
At least one side of the length direction of mirror column (12) is provided with LED light source (4), the cross section of the prism columns (12) it is described
The length of side that isosceles trapezoid abuts the upper bottom edge of the base material film (11) is a, the length of side of the bottom far from the base material film (11)
For b, wherein a>b；It is characterized in that, the optical diaphragm (1) is bonded in the pattern-free light guide plate (2) by adhesive layer (3)
Side；The adhesive layer (3) is made of thermmohardening type or ultraviolet ray hardening type polymer；The pattern-free light guide plate (2)
Coefficient of thermal expansion is less than the coefficient of thermal expansion of the prism columns (12), and the coefficient of thermal expansion of the prism columns (12) is less than described glue
Close the coefficient of thermal expansion of layer (3)；Spacing between the adjacent prism columns (12) of the LED light source (4) is more than separate
Spacing between the adjacent prism columns (12) of the LED light source (4)；The waist of the isosceles trapezoid with perpendicular to the upper bottom
The angle α of the straight line on side is 25 to 50 degree；The prism columns (12) are made of ultraviolet ray hardening type polymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810561323.6A CN108761628A (en) | 2015-05-28 | 2015-05-28 | A kind of optical diaphragm for light guide plate |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810561323.6A CN108761628A (en) | 2015-05-28 | 2015-05-28 | A kind of optical diaphragm for light guide plate |
| CN201510283644.0A CN104834051B (en) | 2015-05-28 | 2015-05-28 | Pattern-free light guide plate optical diaphragm and backlight module |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510283644.0A Division CN104834051B (en) | 2015-05-28 | 2015-05-28 | Pattern-free light guide plate optical diaphragm and backlight module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108761628A true CN108761628A (en) | 2018-11-06 |
Family
ID=53812044
Family Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810561304.3A Pending CN108776408A (en) | 2015-05-28 | 2015-05-28 | A kind of light guide plate optical diaphragm |
| CN201810561323.6A Pending CN108761628A (en) | 2015-05-28 | 2015-05-28 | A kind of optical diaphragm for light guide plate |
| CN201810561341.4A Pending CN108776409A (en) | 2015-05-28 | 2015-05-28 | A kind of optical diaphragm |
| CN201510283644.0A Active CN104834051B (en) | 2015-05-28 | 2015-05-28 | Pattern-free light guide plate optical diaphragm and backlight module |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810561304.3A Pending CN108776408A (en) | 2015-05-28 | 2015-05-28 | A kind of light guide plate optical diaphragm |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810561341.4A Pending CN108776409A (en) | 2015-05-28 | 2015-05-28 | A kind of optical diaphragm |
| CN201510283644.0A Active CN104834051B (en) | 2015-05-28 | 2015-05-28 | Pattern-free light guide plate optical diaphragm and backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (4) | CN108776408A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562966A (en) * | 2018-01-29 | 2018-09-21 | 惠州市华星光电技术有限公司 | A kind of light guide plate and backlight module |
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- 2015-05-28 CN CN201810561304.3A patent/CN108776408A/en active Pending
- 2015-05-28 CN CN201810561323.6A patent/CN108761628A/en active Pending
- 2015-05-28 CN CN201810561341.4A patent/CN108776409A/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108776408A (en) | 2018-11-09 |
| CN104834051B (en) | 2018-07-06 |
| CN108776409A (en) | 2018-11-09 |
| CN104834051A (en) | 2015-08-12 |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20181106 |