CN103901514A - Optical prism, prismatic lens, backlight module and liquid crystal display device - Google Patents
Optical prism, prismatic lens, backlight module and liquid crystal display device Download PDFInfo
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- CN103901514A CN103901514A CN201410109197.2A CN201410109197A CN103901514A CN 103901514 A CN103901514 A CN 103901514A CN 201410109197 A CN201410109197 A CN 201410109197A CN 103901514 A CN103901514 A CN 103901514A
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- optical prism
- prismatic lens
- matrix
- backlight module
- light
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Abstract
The invention provides an optical prism, a prismatic lens, a backlight module and a liquid crystal display device, and belongs to the technical field of display. The problem that an existing prismatic lens is low in light utilization rate and small in light emitting visual angle can be solved. The cross section of a prism of the prismatic lens is in a shape of combination of a triangle and a trapezoid, and the bottom edge of the triangle and the upper bottom of the trapezoid coincide. The prismatic lens comprises the optical prism, the backlight module comprises the prismatic lens, and the liquid crystal display device comprises the backlight module. By means of the optical prism, the prismatic lens, the backlight module and the liquid crystal display device, the light utilization rate can be improved, and the light emitting visual angle can be enlarged.
Description
Technical field
The invention belongs to display technique field, be specifically related to a kind of optical prism, prismatic lens,
Backlight module and liquid crystal indicator.
Background technology
Thin Film Transistor-LCD generally comprises display panel and backlight module two large divisions.Wherein, be typically provided with prismatic lens in exiting surface one side of the light guide plate of backlight module, for light is converged, in the situation that not increasing emergent light total light flux, improve the brightness of the positive apparent direction of liquid crystal display (perpendicular to display plane).
Wherein, as depicted in figs. 1 and 2, prismatic lens comprises matrix 11, coat 12 and optical prism 13, coat 12 is located at incidence surface one side of matrix 11, can reach uniform light and the effect that prevents from scratching matrix 11 incidence surfaces, optical prism 13 is located at exiting surface one side of matrix 11, and the material of optical prism 13 is polymethylmethacrylates, refractive index is PET compared with matrix 11(material) large, converge effect of light.The shape of optical prism 13 its xsects is generally isosceles right triangle.Wherein, normal 131 is perpendicular to optical prism 13 sides, incident ray 132 is near Z-axis y incident, the 134th, the angular range of incident ray 132, be refracted to close Z-axis y through prism, incident ray 133 is near transverse axis x incident, and the 135th, the angular range of incident ray 133, is refracted near transverse axis x by prism.Like this, when prismatic lens that light is isosceles right triangle by prism cross section (as shown in Figure 2), the angle of the hypotenuse of incident ray and isosceles triangle is expressed as θ, be that 45 ° and 135 ° of view directions have brightness low ebb (as shown in Figure 3 and Figure 4 at θ, wherein, Fig. 3 is the schematic diagram that use test device 4 is tested the visual angle brightness data of prismatic lens, Fig. 4 is prismatic lens visual angle brightness curve schematic diagram), and LCDs has certain angular field of view, in addition people watch the custom of LCDs, light outside 45 ° to 135 ° scopes is actually invalid light, cause light utilization efficiency lower.
Inventor finds that in prior art, at least there are the following problems: existing prismatic lens, the utilization factor of light is had much room for improvement, and the bright dipping visual angle of the refracted ray of incident ray after prismatic lens is less than normal.
Summary of the invention
Technical matters to be solved by this invention comprises, for the problem that light utilization efficiency is lower and bright dipping visual angle is less than normal of existing prismatic lens, provides a kind of light utilization efficiency is higher and bright dipping visual angle is larger optical prism, prismatic lens, backlight module and liquid crystal indicator.
Solving the technical scheme that the technology of the present invention problem adopts is a kind of optical prism, the xsect of described prism be shaped as a triangle and a trapezoidal shape being combined into, wherein said leg-of-mutton base overlaps with trapezoidal upper base.
The latter half of optical prism shape of cross section of the present invention is trapezoidal, thereby make the part light outside 45 ° and 135 °, be converted into and converge light, become effective bright dipping, improve light utilization efficiency, increased the bright dipping visual angle of optical prism, and the change of the shape of cross section of the present invention to optical prism is simple to operate simultaneously, is easy to realize.
Preferably, described triangle is isosceles right triangle, described trapezoidal be isosceles trapezoid, the base of described isosceles right triangle overlaps with the upper base of isosceles trapezoid, the angle at the base angle of described isosceles trapezoid is greater than 45 degree.
Preferably, the cross part on two of the right angle of described isosceles triangle limits is provided with arc-shaped transition structure.
Preferably, the material of described optical prism is polymethylmethacrylate.
The technical scheme that solution the technology of the present invention problem adopts is a kind of prismatic lens, comprises matrix, and exiting surface one side of described matrix is provided with multiple as above-mentioned optical prism.
Prismatic lens of the present invention comprises above-mentioned optical prism, and therefore the light utilization ratio of prismatic lens is improved, bright dipping visual angle increased.
Preferably, described multiple optical prism is arranged in array on described matrix exiting surface
Preferably, incidence surface one side of described matrix is provided with coat, for uniform light and the incidence surface that prevents from scratching matrix.
Further preferably, the material of described coat is polymethylmethacrylate.
Preferably, the material of described matrix is polyethylene terephthalate.
Preferably, the refractive index of described optical prism is greater than the refractive index of matrix.
The technical scheme that solution the technology of the present invention problem adopts is a kind of backlight module, comprises light guide plate, and exiting surface one side of described light guide plate is provided with above-mentioned prismatic lens.
Backlight module of the present invention comprises above-mentioned prismatic lens, and the brightness of backlight module further improves.
The technical scheme that solution the technology of the present invention problem adopts is a kind of liquid crystal indicator, comprises display panel and above-mentioned backlight module, and described backlight module is used to described display panel that backlight is provided.
Liquid crystal indicator of the present invention comprises above-mentioned backlight module, and the display quality of display device is had been further upgraded thus.
Accompanying drawing explanation
Fig. 1 is the sectional view of existing prismatic lens;
Fig. 2 is the sectional view of the optical prism in Fig. 1;
Fig. 3 is prismatic lens test schematic diagram;
Fig. 4 is prismatic lens visual angle brightness curve schematic diagram;
Fig. 5 is the sectional view of the prismatic lens of the embodiment of the present invention 1,2;
Fig. 6 is the sectional view of optical prism in Fig. 5;
Fig. 7 is the cross sectional shape of optical prism of embodiments of the invention 1,2 and the schematic diagram that the cross sectional shape of existing optical prism is compared;
Fig. 8 is the light path enlarged drawing of 5 parts in Fig. 7;
Fig. 9 is that base angle is the schematic diagram of the optical prism of 60 °.
Wherein Reference numeral is: 1, prismatic lens; 11, matrix; 12, coat; 13, optical prism; 131,511,521, normal; 132,133,50, incident ray; 134,135, angular range; 136, base angle; 512,522, incident angle; 513,523, refraction angle; 514,524, refracted ray; 4, proving installation.
Embodiment
For making those skilled in the art understand better technical scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment 1:
The present embodiment provides a kind of optical prism, and the material of optical prism is preferably polymethylmethacrylate.The xsect of described prism be shaped as a triangle and a trapezoidal shape being combined into, wherein said leg-of-mutton base overlaps with trapezoidal upper base.
In the present embodiment, as shown in Figure 5 and Figure 6, preferred, described triangle is isosceles right triangle, because the angle of optical prism drift angle is 90 ° time, no matter still going out on light effect in technique is all preferably to select, and the drift angle of described preferred this isosceles triangle adopts 90 °.
Described trapezoidal be isosceles trapezoid, the hypotenuse of described isosceles right triangle overlaps with the upper base of isosceles trapezoid, and the angle at the base angle 136 of isosceles trapezoid is greater than 45 degree, this base angle is expressed as α.Also the latter half that is the xsect of optical prism is changed into trapezoidal, why carry out above-mentioned change in the shape of xsect the latter half of optical prism, be because from 45 ° to 135 ° the light of incident outside scope, mainly enter from the latter half of the xsect of optical prism.
For convenience of description, the optical prism that is isosceles right triangle shape of cross section is expressed as the first optical prism, and the optical prism that is the combined shape of isosceles right triangle and isosceles trapezoid shape of cross section is expressed as the second optical prism.
Particularly, as shown in Figure 6, for the second optical prism, the propagation condition of its light is specific as follows:
Due to the isosceles trapezoid that is shaped as of the xsect of optical prism, light is similar at the propagation law of the side at two waist places of isosceles trapezoid, so be only described with the light transmition situation of the side (below claiming plane of refraction) at a waist place of isosceles trapezoid below.
Normal 131 is perpendicular to plane of refraction, if incident ray 132 enters along normal 131 directions, known according to the law of refraction of light, the direction of this light will not change.Wherein, the region incident of incident ray 132 between Z-axis y and normal 131, the incident area of incident ray 132 is angular range 134, represents with β, its refracted ray is drawn close to Z-axis y direction.The region incident of incident ray 133 between transverse axis x and normal 131, the incident area of incident ray 133 is angular range 135, represents with γ, its refracted ray is close to transverse axis x direction.In Fig. 6, incident ray 132 is also the scope that β represents from angular range 134() incident area during take angle θ (θ is as incident ray 132 and the base angulation of isosceles trapezoid) incident, final deflection Z-axis y direction after the plane of refraction refraction at the second waist place, optical prism left side, become efficient light, the scope of angle θ is β, due to β=α >45 °, therefore the scope of angle θ is greater than 45 °.
Like this, for the second optical prism, part incident ray (being also the part light that incident angle is less than 45 °) between <45 ° of 0 ° of < θ of incident angle, also will be close to Z-axis y direction after its refraction, become to Z-axis y direction close converge light, thereby become effective bright dipping, improved the utilization factor of light.
It should be noted that, when the region incident of incident ray 132 between waist and the Z-axis y of isosceles trapezoid, the total reflection of light will occur, it is finally consistent with foregoing description from the rule of the second optical prism outgoing, is no longer described in detail at this.
For the second optical prism, because light is identical at the propagation law of the side at two waist places of isosceles trapezoid (being plane of refraction), part incident ray for θ angle between 135 ° to 180 °, it reflects the plane of refraction with another waist place at the second optical prism, after refraction, become to Z-axis y ' (attached not shown) direction close converge light, thereby become effective bright dipping, improved the utilization factor of light.
Like this, for the second optical prism, it can be converted into the part light outside 45 ° to 135 ° scopes to converge light, thereby becomes effective bright dipping, has improved the utilization ratio of light.And it is large that the scope at the θ angle of the incident ray of corresponding efficient light becomes, make its refraction rising angle become large, bright dipping visual angle increases.
As shown in Figure 7 and Figure 8, wherein, Fig. 8 is to a branch of incident ray 50, the refraction situation in the first optical prism and the second optical prism contrasts.Wherein, for the first optical prism, normal 511 is perpendicular to the plane of refraction of the first optical prism, for incident ray 50, and its incident angle 512, refraction angle 513 forms refracted ray 514 after the first optical prism.For the second optical prism, normal 521 is perpendicular to the plane of refraction of the second optical prism, incident ray 50, and its incident angle 522, refraction angle 523 forms refracted ray 524 after the second optical prism.As can be seen from Figure 8, obviously refracted ray 524 is near vertical direction, and refracted ray 514 is close to horizontal direction, is also that light 524 becomes the light converging to vertical direction, is effective light guide.That is to say, the second optical prism can utilize more light with respect to the first optical prism, has improved the utilization factor of light.
Fig. 9 is the schematic diagram of the light transmition situation of second optical prism of α while being 60 °.Wherein β is 60 °, and by the light of the second optical prism bottom surface incident, for the first optical prism, incident angle scope is to become effective bright dipping after the light refraction within 30 ° to 150 °.
In the present embodiment, preferred, the cross part on two limits at the right angle of described isosceles triangle is provided with arc-shaped transition structure.In actual implementation process, arc-shaped transition structure can be specially at the drift angle of isosceles right angle trigonometry type and form circular arc, thereby reduces the scratch to the optics being in contact with it, and reduces the damage of miscellaneous part to optical prism itself.
It should be noted that, in the present embodiment, the shape of the first half of the shape of cross section of optical prism describes as an example of isosceles right triangle example, if the drift angle of isosceles triangle is set to be less than 90 °, also can improve the utilization factor of light in theory, more but prismatic lens maximum brightness meeting reduces.
The latter half of the optical prism shape of cross section of the present embodiment is trapezoidal, thereby make the part light outside 45 ° and 135 °, be converted into and converge light, become effective bright dipping, improve light utilization efficiency, increased the bright dipping visual angle of optical prism, and the change of the shape of cross section of the present invention to optical prism is simple to operate simultaneously, is easy to realize.
Embodiment 2:
The present embodiment provides a kind of prismatic lens, as shown in Figure 5 and Figure 6, comprises matrix 11, and the optical prism 13 providing in multiple embodiment 1 is provided exiting surface one side of described matrix 11, and the material of optical prism 13 is polymethylmethacrylates, works to converge light.
Preferably, the material of described matrix 11 is polyethylene terephthalate.
Preferably, described coat 12, plays uniform light and prevents from scratching described matrix 11 incidence surfaces.Further preferred, the material of described coat 12 is polymethylmethacrylate.
Preferably, described optical prism 13 is the arbitrary structure in embodiment 1, and the refractive index of its material is greater than the refractive index of matrix 11.
Preferably, described multiple optical prism 13 is arranged in array on described matrix 11 exiting surfaces.Such as in the time that the exiting surface of matrix 11 is rectangle, the axis of multiple described optical prisms 13 is vertical with the long limit of exiting surface, and the two ends of optical prism and the edge of exiting surface flush, and the rib of adjacent optical prism 13 on exiting surface is in contact with one another.
The prismatic lens of the present embodiment comprises the optical prism 13 in embodiment 1, and therefore the light utilization ratio of prismatic lens is improved, and bright dipping visual angle increases simultaneously, and very little on the maximum brightness impact of prismatic lens.
The present embodiment also provides a kind of backlight module, can be used in liquid crystal indicator to improve the display quality of display device.The backlight module of the present embodiment comprises light guide plate and as other known structures such as luminescence units, is not described in detail at this.Wherein, exiting surface one side of described light guide plate is provided with above-mentioned prismatic lens.
The backlight module of the present embodiment comprises above-mentioned prismatic lens, thereby the brightness of backlight module is further improved, and it is large that bright dipping visual angle also further becomes.
The present embodiment also provides a kind of liquid crystal indicator, comprises display panel and above-mentioned backlight module, and described backlight module is used to described display panel that backlight is provided.
The display device of the present embodiment can be: any product or parts with Presentation Function such as liquid crystal panel, Electronic Paper, LCD TV, liquid crystal display, digital album (digital photo frame), mobile phone, panel computer.
The liquid crystal indicator of the present embodiment comprises above-mentioned backlight module, and the display quality of display device is had been further upgraded thus.
Be understandable that, above embodiment is only used to principle of the present invention is described and the illustrative embodiments that adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (12)
1. an optical prism, is characterized in that, the xsect of described optical prism be shaped as a triangle and a trapezoidal shape being combined into, wherein said leg-of-mutton base overlaps with trapezoidal upper base.
2. optical prism according to claim 1, it is characterized in that, described triangle is isosceles right triangle, described trapezoidal be isosceles trapezoid, the base of described isosceles right triangle overlaps with the upper base of isosceles trapezoid, and the angle at the base angle of described isosceles trapezoid is greater than 45 degree.
3. optical prism according to claim 2, is characterized in that, the cross part on two limits at the right angle of described isosceles triangle is provided with arc-shaped transition structure.
4. optical prism according to claim 1, is characterized in that, the material of described optical prism is polymethylmethacrylate.
5. a prismatic lens, comprises matrix, it is characterized in that, exiting surface one side of described matrix is provided with multiple optical prisms as described in claim 1 to 4 any one.
6. prismatic lens according to claim 5, is characterized in that, described multiple optical prisms are arranged in array on described matrix exiting surface.
7. prismatic lens according to claim 5, is characterized in that, incidence surface one side of described matrix is provided with coat, for uniform light with prevent from scratching described matrix incidence surface.
8. prismatic lens according to claim 7, is characterized in that, the material of described coat is polymethylmethacrylate.
9. prismatic lens according to claim 5, is characterized in that, described matrix material is polyethylene terephthalate.
10. according to the prismatic lens described in claim 5 to 9 any one, it is characterized in that, the refractive index of described optical prism is greater than the refractive index of matrix.
11. 1 kinds of backlight modules, comprise light guide plate, it is characterized in that, exiting surface one side of described light guide plate is provided with the prismatic lens as described in any one in claim 5 to 10.
12. 1 kinds of liquid crystal indicators, comprise display panel, it is characterized in that, also comprise backlight module as claimed in claim 11, and described backlight module is used to described display panel that backlight is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410109197.2A CN103901514A (en) | 2014-03-21 | 2014-03-21 | Optical prism, prismatic lens, backlight module and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410109197.2A CN103901514A (en) | 2014-03-21 | 2014-03-21 | Optical prism, prismatic lens, backlight module and liquid crystal display device |
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| CN103901514A true CN103901514A (en) | 2014-07-02 |
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| CN201410109197.2A Pending CN103901514A (en) | 2014-03-21 | 2014-03-21 | Optical prism, prismatic lens, backlight module and liquid crystal display device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104482501A (en) * | 2014-12-29 | 2015-04-01 | 欧普照明股份有限公司 | Optical element, optical module and lighting device |
| CN107219577A (en) * | 2017-07-31 | 2017-09-29 | 昆山龙腾光电有限公司 | Prism plate and display device |
| CN109735180A (en) * | 2018-12-25 | 2019-05-10 | 宁波激智科技股份有限公司 | Protective layer coating composition and a kind of brightness enhancement film are hurt in a kind of resistance to compression |
| CN111164465A (en) * | 2018-02-28 | 2020-05-15 | 株式会社Lg化学 | Viewing angle compensation film, polarizing plate including the same, and display device including the same |
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| CN1816719A (en) * | 2003-07-15 | 2006-08-09 | 三菱丽阳株式会社 | Light source device and light deflection element |
| US20070206913A1 (en) * | 2006-03-03 | 2007-09-06 | Ching-Bin Lin | Optical film having multi-story prisms and manufacturing process thereof |
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| US5303322A (en) * | 1992-03-23 | 1994-04-12 | Nioptics Corporation | Tapered multilayer luminaire devices |
| JP2001343507A (en) * | 2000-06-01 | 2001-12-14 | Mitsubishi Rayon Co Ltd | Lens sheet, planar light source element using the same and liquid crystal display |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104482501A (en) * | 2014-12-29 | 2015-04-01 | 欧普照明股份有限公司 | Optical element, optical module and lighting device |
| CN104482501B (en) * | 2014-12-29 | 2023-09-19 | 欧普照明股份有限公司 | Optical element, optical module and lighting device |
| CN107219577A (en) * | 2017-07-31 | 2017-09-29 | 昆山龙腾光电有限公司 | Prism plate and display device |
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| CN111164465A (en) * | 2018-02-28 | 2020-05-15 | 株式会社Lg化学 | Viewing angle compensation film, polarizing plate including the same, and display device including the same |
| CN111164465B (en) * | 2018-02-28 | 2022-07-12 | 株式会社Lg化学 | Viewing angle compensation film, polarizing plate including the same, and display device including the same |
| CN109735180A (en) * | 2018-12-25 | 2019-05-10 | 宁波激智科技股份有限公司 | Protective layer coating composition and a kind of brightness enhancement film are hurt in a kind of resistance to compression |
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Application publication date: 20140702 |