CN109557719B - Direct type zero OD backlight structure with semi-reflective and semi-transparent light guide plate - Google Patents
Direct type zero OD backlight structure with semi-reflective and semi-transparent light guide plate Download PDFInfo
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- CN109557719B CN109557719B CN201811455265.5A CN201811455265A CN109557719B CN 109557719 B CN109557719 B CN 109557719B CN 201811455265 A CN201811455265 A CN 201811455265A CN 109557719 B CN109557719 B CN 109557719B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0025—Diffusing sheet or layer; Prismatic sheet or layer
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- 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
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
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- 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
- G02B6/0065—Manufacturing aspects; Material aspects
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
Abstract
The invention discloses a direct type zero OD backlight structure with a semi-reflective and semi-transparent light guide plate, wherein a rectangular groove is formed in the upper end surface of a back plate, a white reflecting layer is coated on the inner bottom wall of the rectangular groove, an LED light source is fixedly connected onto the white reflecting layer, the semi-reflective and semi-transparent light guide plate is fixed onto the LED light source, a lower diffusion film is fixed onto the semi-reflective and semi-transparent light guide plate, a prism film is fixed onto the lower diffusion film, an upper diffusion film is fixed onto the prism film, the semi-reflective and semi-transparent light guide plate is made of PS materials, the weight is lower, the cost is lower, membranes can be correspondingly reduced due to the improvement of light effect haze, and the cost is further reduced. The invention has the advantages of side-in type lightness and thinness, the total thickness is not more than 8mm, the shielding property is excellent, the OD approaches to 0, the light utilization rate can be improved, the light leakage is avoided, the curved surface display can be realized, and the development requirement of lightness and thinness is met. The invention also has the advantage of direct type, can realize the regional dimming, and the light emitting mode is higher than the side type brightness.
Description
Technical Field
The invention relates to the technical field related to backlight structures, in particular to a direct type zero OD backlight structure with a semi-reflecting and semi-transmitting light guide plate.
Background
The backlight structure provides a backlight source component in LCD display products, generally comprising a backlight source, a plurality of layers of backlight materials and a support frame, wherein only 60% of light emitted by the traditional backlight source enters a polarizing film after passing through a reflecting film diffusion film, and the light loss is high. Common structures include direct backlight structures and side-entry backlight structures.
The direct type backlight source is simple in process, a light guide plate is not needed, the LED array is arranged at the bottom of the lamp box, light emitted from the LEDs is reflected through the bottom surface and the side surface, and then is uniformly emitted through the diffusion film on the surface and the optical module. The thickness of a direct-lit backlight is determined by the distance between the bottom of the light box and the diffuser plate, and generally the thicker the thickness, the better the light uniformity of the backlight. When the backlight is thin, color and brightness uniformity become the technical key of the direct type backlight. The direct type LED display screen has the advantages of being low in cost and capable of respectively finely adjusting the brightness of the LED lamps in each area, and therefore dynamic contrast of a picture can be greatly improved. The disadvantage is that a larger number of LEDs are needed, the thickness is slightly thicker than that of the side-mounted type backlight, the OD (optical distance) can be made to be 10mm by the prior art, the prior art cannot be bent, and the overall thickness of the side-mounted type backlight is thicker than that of the side-mounted type backlight.
The lateral entrance type backlight module is characterized in that the LED crystal grains are arranged at the peripheral edge of the liquid crystal screen, and the light guide plate is matched, so that when the LED backlight module emits light, the light emitted from the edge of the screen is transmitted to the area in the center of the screen through the light guide plate, and therefore the whole backlight module has enough luminous flux and can ensure that the liquid crystal screen can display clearly and brightly. The light guide plate is mainly manufactured by taking methyl methacrylate PMMA and methyl methacrylate-styrene copolymer MS as raw materials. Has the advantages that the thickness of the machine body is thinner, and the machine body can be made into a curved surface. The disadvantages are that because the light source is arranged at the side of the light guide plate, the LED is limited by the particle number and the brightness, and when the light is still required to be uniformly dispersed on the whole plane, the larger the area of the panel is, the more limited the luminance application of the light source is, the more difficult the optical design is, the higher the manufacturing cost is, and the light control in different areas cannot be realized.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a direct type zero OD backlight structure having a semi-reflective and semi-transmissive light guide plate, which combines the advantages of direct type backlight and side type backlight, and uses the semi-reflective and semi-transmissive light guide plate to achieve the purposes of reducing thickness and weight, reducing cost, and improving quality.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a zero OD backlight unit of straight following formula with semi-transparent light guide plate partly reflects, includes the backplate, the rectangular channel has been seted up to the up end of backplate, the white reflection stratum is scribbled to the inner diapire of rectangular channel, fixedly connected with LED light source on the white reflection stratum, be fixed with semi-transparent light guide plate partly reflects on the LED light source, be fixed with down the diffusion barrier on the semi-transparent light guide plate partly reflects, be fixed with the prism membrane down on the diffusion barrier, be fixed with last diffusion barrier on the prism membrane, the top of going up the diffusion barrier is fixed with liquid crystal display panel, liquid crystal display panel passes through upper cover plate and backplate fixed connection.
Further, the distance between the adjacent LED light sources is the same.
Furthermore, the semi-reflecting and semi-transmitting light guide plate is a composite light guide plate synthesized by a multilayer structure, and the thickness of the composite light guide plate is not more than 1.5 mm.
Further, the sum of the thicknesses of the LED light source and the bottom plate of the back plate is not more than 2.5 mm.
Furthermore, the thickness of the liquid crystal panel and the thickness of the upper cover plate are not more than 1.5 mm.
Further, the thicknesses of the lower diffusion film, the prism film and the upper diffusion film are not more than 0.3 mm.
Further, the semi-reflecting and semi-permeable light guide plate is made of one of PS, PMMA, MS, PC and glass materials.
Furthermore, the lower end face of the semi-reflecting and semi-transmitting light guide plate is abutted to the upper end of the LED light source.
Further, the back plate, the white reflecting layer and the LED light source are integrally formed.
The invention has the beneficial effects that:
(1) the semi-reflecting and semi-transparent light guide plate is made of a PS material, is lower in weight and cost compared with PMMA and MS, and is made of PC and glass, so that the number of the films can be correspondingly reduced due to the improvement of light effect and haze, and the cost is further reduced.
(2) The invention has the advantages of side-in type lightness and thinness, the total thickness is not more than 8mm, the shielding property is excellent, the OD approaches to 0, the light utilization rate can be improved, the light leakage is avoided, the curved surface display can be realized, and the development requirement of lightness and thinness is met.
(3) The invention also has the advantage of direct type, can realize the regional dimming, and the light-emitting mode is higher than the side-entering type brightness, and the light-emitting is even, effectual.
Drawings
The invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of the present invention.
In the figure: the backlight module comprises a back plate 1, a white reflecting layer 2, an LED light source 3, a semi-reflecting and semi-transmitting light guide plate 4, a lower diffusion film 5, a prism film 6, an upper diffusion film 7, a liquid crystal panel 8 and an upper cover plate 9.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present embodiment provides a direct type zero OD backlight structure with a semi-reflective and semi-transmissive light guide plate, including a back plate 1, a rectangular groove is formed on an upper end surface of the back plate 1, a white reflective layer 2 is coated on an inner bottom wall of the rectangular groove, an LED light source 3 is fixedly connected to the white reflective layer 2, and the back plate 1, the white reflective layer 2 and the LED light source 3 are integrally formed. The adjacent LED light sources 3 have the same distance and are uniformly distributed. A semi-reflective and semi-transparent light guide plate 4 is fixed on the LED light source 3, and the semi-reflective and semi-transparent light guide plate 4 is fixedly clamped with a clamping groove arranged in the back plate 1, so that the lower end surface of the semi-reflective and semi-transparent light guide plate 4 is contacted with the upper end of the LED light source 3, and the OD approaches to 0. The semi-reflective and semi-transparent light guide plate 4 is made of PS materials, a lower diffusion film 5 is fixed on the semi-reflective and semi-transparent light guide plate 4, a prism film 6 is fixed on the lower diffusion film 5, an upper diffusion film 7 is fixed on the prism film 6, a liquid crystal panel 8 is fixed above the upper diffusion film 7, and the liquid crystal panel 8 is fixedly connected with the back plate 1 through an upper cover plate 9.
The semi-reflecting and semi-transmitting light guide plate 4 is a composite light guide plate synthesized by a multilayer structure, and the thickness of the composite light guide plate is not more than 1.5 mm.
The sum of the thicknesses of the LED light source 3 and the bottom plate of the back plate 1 is not more than 2.5 mm.
The thicknesses of the liquid crystal panel 8 and the upper cover plate 9 are not more than 1.5 mm.
The thicknesses of the lower diffusion film 5, the prism film 6, and the upper diffusion film 7 are not more than 0.3 mm.
The semi-reflecting and semi-transmitting light guide plate 4 comprises a light splitting prism film and an LED light source, the longitudinal section of the lower end face of the light splitting prism film is in a sawtooth shape, reflection dots are arranged on the upper end face of the light splitting prism film and used for enabling reflected light to be diffused towards all angles, a reflection layer is coated on the upper end face of the light splitting prism film and is a coating reflection layer, light is enabled to be totally reflected, and light emitting dots penetrating through the coating reflection layer are arranged on the coating reflection layer and used for enabling the light to penetrate through the coating reflection layer. The LED light source 3 is used as a circle center, the density of the reflection mesh points closer to the circle center is larger, and the density of the reflection mesh points farther away from the circle center is smaller, so that the uniformity degree of light is improved. The LED light source 3 is used as a circle center, the density of the light emitting dots closer to the circle center is smaller, and the density of the light emitting dots farther away from the circle center is larger, so that light is uniformly emitted from the light emitting dots.
The working process of the embodiment:
the LED light source 3 emits light, light is reflected and partially reflected by the semi-reflective and semi-transparent light guide plate 4 to realize light splitting, so that the light uniformly emits light from the upper part of the semi-reflective and semi-transparent light guide plate 4, then the uniform light sequentially penetrates through the lower diffusion film 5, the prism film 6 and the upper diffusion film 7, and finally a light source is provided for the liquid crystal panel 8. The semi-reflecting and semi-transparent light guide plate 4 is made of PS materials, and compared with other materials, the semi-reflecting and semi-transparent light guide plate is lower in weight and cost, and due to the fact that the light effect and the haze are improved, the number of films can be correspondingly reduced, and the cost is further reduced. The invention has the advantages of side-in type lightness and thinness, the total thickness is not more than 8mm, the shielding property is excellent, the OD approaches to 0, the light utilization rate can be improved, the light leakage is avoided, the curved surface display can be realized, and the development requirement of lightness and thinness is met. The invention also has the advantage of direct type, can realize the regional dimming, and the light emitting mode is higher than the side type brightness.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (9)
1. The direct type zero-OD backlight structure with the semi-reflective and semi-transparent light guide plate comprises a back plate (1) and is characterized in that a rectangular groove is formed in the upper end face of the back plate (1), a white reflecting layer (2) is coated on the inner bottom wall of the rectangular groove, an LED light source (3) is fixedly connected onto the white reflecting layer (2), a semi-reflective and semi-transparent light guide plate (4) is fixed onto the LED light source (3), a lower diffusion film (5) is fixed onto the semi-reflective and semi-transparent light guide plate (4), a prism film (6) is fixed onto the lower diffusion film (5), an upper diffusion film (7) is fixed onto the prism film (6), a liquid crystal panel (8) is fixed above the upper diffusion film (7), and the liquid crystal panel (8) is fixedly connected with the back plate (1) through an upper cover plate (9);
the semi-reflecting and semi-transmitting light guide plate (4) comprises a light splitting prism film, the longitudinal section of the lower end face of the light splitting prism film is in a sawtooth shape, reflection dots are arranged on the upper end face of the light splitting prism film and used for enabling reflected light to be diffused towards all angles, a reflection layer is coated on the upper end face of the light splitting prism film and is a coating reflection layer, the light is enabled to be totally reflected, light emitting dots penetrating through the coating reflection layer are arranged on the coating reflection layer and used for enabling the light to penetrate through the coating reflection layer, the LED light source (3) is used as a circle center, the density of the reflection dots which are closer to the circle center is larger, and the density of the reflection dots which are farther away from the circle center is smaller.
2. The direct type zero OD backlight structure with the semi-reflecting and semi-transmitting light guide plate as claimed in claim 1, wherein the distance between the adjacent LED light sources (3) is the same.
3. The direct type zero OD backlight structure with the semi-reflective and semi-transmissive light guide plate as claimed in claim 1, wherein the semi-reflective and semi-transmissive light guide plate (4) is a composite light guide plate formed by multi-layer structure, and has a thickness not more than 1.5 mm.
4. The direct type zero OD backlight structure with the semi-reflecting and semi-transmitting light guide plate as claimed in claim 1, wherein the sum of the thicknesses of the LED light sources (3) and the bottom plate of the back plate (1) is not more than 2.5 mm.
5. The direct type zero OD backlight structure with the semi-reflecting and semi-transmitting light guide plate as claimed in claim 1, wherein the thicknesses of the liquid crystal panel (8) and the upper cover plate (9) are not more than 1.5 mm.
6. The direct type zero OD backlight structure with a semi-reflecting and semi-transmitting light guide plate according to claim 1, wherein the thicknesses of the lower diffusion film (5), the prism film (6) and the upper diffusion film (7) are not more than 0.3 mm.
7. The direct type zero OD backlight structure with the semi-reflective and semi-transparent light guide plate as claimed in claim 1, wherein the semi-reflective and semi-transparent light guide plate (4) is made of one of PS, PMMA, MS, PC, and glass.
8. The direct type zero OD backlight structure with the semi-reflective and semi-transmissive light guide plate as claimed in claim 1, wherein the lower end surface of the semi-reflective and semi-transmissive light guide plate (4) is against the upper end of the LED light source (3).
9. The direct type zero OD backlight structure with the semi-reflecting and semi-transmitting light guide plate as claimed in claim 1, wherein the back plate (1), the white reflective layer (2) and the LED light sources (3) are integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811455265.5A CN109557719B (en) | 2018-11-30 | 2018-11-30 | Direct type zero OD backlight structure with semi-reflective and semi-transparent light guide plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811455265.5A CN109557719B (en) | 2018-11-30 | 2018-11-30 | Direct type zero OD backlight structure with semi-reflective and semi-transparent light guide plate |
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| CN109557719B true CN109557719B (en) | 2021-07-27 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110136597A (en) * | 2019-05-23 | 2019-08-16 | 安徽芯瑞达科技股份有限公司 | A kind of ultra-thin matrix backlight mould group and preparation method thereof |
| JP7160863B2 (en) * | 2020-06-26 | 2022-10-25 | 日亜化学工業株式会社 | Display device and light diffusion sheet laminate |
| CN112198719A (en) * | 2020-10-28 | 2021-01-08 | 东莞市银泰丰光学科技有限公司 | Backlight module with side-in type and direct type mixed partition dimming and control method |
| CN114035375B (en) * | 2021-11-19 | 2023-09-26 | 武汉华星光电半导体显示技术有限公司 | Backlight module |
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| CN109557719A (en) | 2019-04-02 |
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