CN111381399A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
- Publication number
- CN111381399A CN111381399A CN201811610311.4A CN201811610311A CN111381399A CN 111381399 A CN111381399 A CN 111381399A CN 201811610311 A CN201811610311 A CN 201811610311A CN 111381399 A CN111381399 A CN 111381399A
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- Prior art keywords
- light
- backlight module
- buffer layer
- module according
- prism
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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
-
- 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
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
-
- 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
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
A backlight module and a display device are provided, wherein the backlight module comprises a light emitting unit, a prism unit and a buffer layer. The light-emitting unit is provided with a light-emitting surface through which backlight light can pass. The prism unit comprises a base material and a plurality of prism structures arranged on the surface of the base material, and the prism structures face the light-emitting surface of the light-emitting unit. The buffer layer is arranged between the light-emitting unit and the prism structure in a clamped mode, and the prism structure is not in contact with the light-emitting surface of the light-emitting unit. Therefore, the display equipment using the backlight module has good performance in optical performance, image picture performance, service life and production yield.
Description
Technical Field
The present invention relates to a backlight module and a display device, and more particularly, to a backlight module and a display device capable of improving optical performance and image performance.
Background
In recent years, liquid crystal displays have been widely used in various electronic devices, and based on the characteristics of liquid crystal display technology, the liquid crystal displays need to be configured with a backlight module for providing backlight, and the backlight module includes an edge type and a direct type according to the light source configuration manner, but the backlight module of any type is currently developed in the direction of improving optical efficiency (such as brightness) and reducing thickness. In addition, the improvement of the service life and the production yield is also a crucial issue.
Disclosure of Invention
The present invention is directed to a backlight module capable of improving the above problems.
In some embodiments, the backlight module includes a light emitting unit, a prism unit and a buffer layer. The light-emitting unit is provided with a light-emitting surface through which backlight light can pass. The prism unit comprises a base material and a plurality of prism structures arranged on the surface of the base material, and the prism structures face the light-emitting surface of the light-emitting unit. The buffer layer is clamped between the light emitting unit and the prism structure, so that the prism structure does not contact with the light emitting surface of the light emitting unit.
In some embodiments, the buffer layer is made of a non-hard material.
In some embodiments, the buffer layer is made of a polymer composite.
In some embodiments, the buffer layer is made of at least one of terephthalate, polycarbonate, polymethyl methacrylate, and triacetate.
In some embodiments, the buffer layer has a refractive index of 1.4 to 1.7.
In some embodiments, the buffer layer has a transmittance of not less than 80%.
In some embodiments, the buffer layer has a haze of no greater than 10%.
In some embodiments, the buffer layer has a thickness in a range from 12 microns to 300 microns.
In some embodiments, the buffer layer has a thickness in a range from 30 microns to 200 microns.
In some embodiments, the buffer layer has a thickness in a range from 35 microns to 125 microns.
In some embodiments, the light emitting unit includes a light source and a light guide plate, the light guide plate has the light exit surface, and the light source is disposed corresponding to a position of the light guide plate other than the light exit surface; the buffer layer is arranged on the light emitting surface of the light guide plate.
Another object of the present invention is to provide a display apparatus. The display device comprises the backlight module and a display module, wherein the display module can receive backlight light emitted by the backlight module to display an image picture.
The invention has the beneficial effects that: the backlight module can prevent the sharp corner of the prism structure from scratching and other damages to the light emitting surface of the light emitting unit by means of the arrangement of the buffer layer, so that the optical efficiency and the imaging quality are improved, the service life is prolonged, and the yield is improved. In addition, by means of the arrangement of the buffer layer, the prism structure does not need to be made of soft materials to avoid the scratch problem, and the prism structure is not made of soft materials to avoid being adsorbed on other structures, so that the adsorption problem of the prism structure can be prevented from causing adverse effects on optical and imaging effects. Therefore, the display device using the backlight module has good performance in optical performance, image picture performance, service life and production yield.
Drawings
FIG. 1 is a schematic diagram illustrating an embodiment of a display device according to the present invention;
FIG. 2 is a partially exploded view of FIG. 1;
FIG. 3 is a schematic diagram illustrating an alternative embodiment of the display device; and
fig. 4 is a schematic diagram illustrating another variation of the display device.
Detailed Description
Referring to fig. 1 and fig. 2, a display apparatus 1 according to an embodiment of the present invention is shown, where the display apparatus 1 can be applied to an electronic device such as a display, a mobile phone, and the like, and specifically includes a display module 2 and a backlight module 3.
The display module 2 is, for example, a liquid crystal module, and can include structures such as a liquid crystal layer, a polarizing layer, a thin film transistor layer, and a color filter, which are not drawn in the drawing, and the display module 2 can receive backlight light emitted by the backlight module 3 to present an image picture.
The backlight module 3 is used for emitting backlight light required by the imaging module 2, and specifically comprises a light-emitting unit 4, a reflector plate 5, a prism unit 6 and a buffer layer 7.
The light emitting unit 4 has a light source 41 and a light guide plate 42, and the side-light structure is illustrated in the embodiment. In the light source 41, a lamp or an LED light bar can be installed to serve as a light source for providing backlight light, in this embodiment, although the light source 41 is disposed on only one side of the light guide plate 42, additional light sources 41 can be disposed according to actual requirements. The side of the light guide plate 42 corresponds to the light source 41 and can receive the light generated by the light source 41, and includes a light emitting surface 421 facing the image display module 2 and a reflecting surface 422 opposite to the light emitting surface 421. The light guide plate 42 forms a plurality of dot structures not drawn in the drawing on the reflection surface 422, and the light emitted from the light source 41 enters the light guide plate 42 and travels through a total reflection path in the light guide plate 42, however, the dot structures on the reflection surface 422 can destroy a total reflection mechanism of the light, so that the light can penetrate out of the light guide plate 42 and irradiate in the direction of the light exit surface 421 after being reflected by the reflection sheet 5. The reflective sheet 5 is disposed at the reflective surface 422 of the light guide plate 42, and can form a surface with high reflectivity by coating, thereby providing a high-efficiency light reflection effect.
Referring to fig. 1, 3 and 4, it should be noted that, in addition to the flat plate structure in fig. 1 and the small wedge structure (taper) formed on the light emitting surface 421 near the light source 41, the light guide plate 42 can also be a flat plate structure as in fig. 3 or a wedge structure as in fig. 4, and these embodiments are all realized by the light guide plate 42.
Referring to fig. 1 and fig. 2, the prism unit 6 includes a substrate 61 and a plurality of prism structures 62 disposed on a surface of the substrate 61, wherein the sharp corners of the prism structures 62 face the light emitting surface 421 of the light emitting unit 4. Accordingly, after the light emitted by the light emitting unit 4 penetrates through the buffer layer 7 to the prism structure 62, the traveling path of the backlight light can be changed by the prism structure 62, and the direction of the backlight light is mainly guided to irradiate towards the image display module 2, so that the illumination intensity at the image display module 2 can be effectively improved, and the brightness of the whole display picture is improved.
The buffer layer 7 is sandwiched between the light emitting unit 4 and the prism structure 62, for example, in this embodiment, the buffer layer 7 is attached to the light emitting surface 421 of the light guide plate 42 or placed on the light emitting surface 421 of the light guide plate 42, but the embodiments are not limited thereto. The buffer layer 7 is preferably made of a non-hard material such as a polymer composite material type of polyethylene terephthalate (PET), Polycarbonate (PC), Polymethyl Methacrylate (PMMA), Polyimide (PI), or triacetate fiber (TAC), and the surface of the non-hard material can be treated by spraying or printing, or the surface of the non-hard material can be treated by coating the polymer material on the top and bottom surfaces and curing the polymer material by uv light or heat baking, so that the surface properties of the light guide plate 42 can be controlled by the surface treatment or coating the polymer material, for example, a microstructure can be formed or the properties of static electricity resistance, scratch resistance, adsorption resistance, etc. can be adjusted. Since the buffer layer 7 is sandwiched between the light emitting unit 4 and the prism structure 62 in this embodiment, the prism structure 62 is prevented from contacting the light emitting surface 421 of the light guide plate 42, so that the sharp corners of the prism structure 62 and other structures do not scratch and damage the light guide plate 42, thereby ensuring that the backlight module 3 can maintain good optical characteristics, ensuring the quality of image frames, and contributing to the improvement of production yield and service life. In a preferred embodiment, the buffer layer 7 has a preferred refractive index of 1.4 to 1.7, a transmittance of not less than 80%, and a haze of not more than 10%, and a preferred thickness range of 12 micrometers to 300 micrometers, a more preferred thickness range of 30 micrometers to 200 micrometers, and a most preferred thickness range of 35 micrometers to 125 micrometers, and the buffer layer 7 can be matched with other structures in the implementation specifications of the refractive index, the transmittance, and the haze, and substantially maintains the optical characteristics of the backlight module 3, but can significantly improve the effects of scratch resistance and adsorption resistance. In addition, in the present embodiment, the thickness of the buffer layer 7 is configured in the implementation range as described above, so that the requirement of reducing the thickness of the buffer layer 7 to achieve thinness can be reduced as much as possible while the protective effect of the buffer layer 7 on the light guide plate 42 is maintained, and the limitation on the maximum thickness can also avoid significant changes in brightness, but the specific thickness of the buffer layer 7 can be adjusted as needed, and the scope disclosed in the present embodiment is not limited.
Watch 1
Referring to table 1, the performance specifications of the backlight module 3 of the present invention and the comparative examples 1-3 are compared. In the embodiment of the present invention, the light emitting unit 4 and the reflective sheet 5 are the same as those of the present invention, but the prism unit 6 and the buffer layer 7 are not disposed in the embodiment of the present invention, and instead, a bottom diffuser (bottom diffuser), a light collecting sheet (prism sheet) and a top diffuser (top diffuser) are disposed at the light emitting surface 421 corresponding to the light guide plate 42 in the embodiment of the present invention in the comparative example 1. In the brightness comparison portion, if the maximum brightness of the backlight module 3 of the present invention is taken as the reference (100%), the maximum brightness of the comparison example 1 is only 83%, which shows that the backlight module 3 of the present invention has better brightness performance than the backlight module using the diffusion sheet and the light-gathering sheet. In the thickness comparison portion, the thickness of the backlight module 3 of the present invention is less than that of the backlight module of the comparative example 1 by about 0.05 mm, which is more advantageous for the thinning of the whole structure. As for the problems of damage to the light guide plate 42 by the prism structure 62 and adsorption of the prism structure 62, since the prism unit 6 is not used in comparative example 1, it is not necessary to consider the occurrence of these problems.
The main difference between the backlight module 3 of the present invention and the backlight module 3 of the present invention in comparative example 2 is that the buffer layer 7 of the present invention is not disposed, and the prism structure 62 of comparative example 2 is made of a hard material. In terms of brightness and thickness performance, the comparative example 2 has slightly better brightness and thinner thickness because the buffer layer 7 is not disposed, but has a significant damage problem of the light guide plate 42 compared to the backlight module 3 of the present invention, because the sharp corners of the hard prism structures 62 contact the light guide plate 42 to scratch the light guide plate 42, the overall optical performance and image frame performance are seriously affected, and the service life and production yield are reduced.
As for comparative example 3, the backlight structure similar to the backlight module 3 of the present invention is also disclosed, and the main difference between the backlight module 3 of the present invention and comparative example 3 is that the buffer layer 7 of the present invention is not disposed, and the prism structure 62 of comparative example 3 is made of soft material. In terms of brightness and thickness, comparative example 3 has better brightness and thinner thickness because the buffer layer 7 is not provided. In comparative example 3, the prism structure 62 is made of a soft material, so the problem that the prism structure 62 damages the light guide plate 42 is less likely to occur, but the soft prism structure 62 contacts the light guide plate 42, and a certain ratio of the soft prism structure is absorbed, thereby affecting the optical performance and the image display. Therefore, the backlight module 3 of the present invention has better performance in comprehensive effect.
In summary, the backlight module 3 of the present invention can effectively prevent the sharp corner of the prism structure 62 from scratching the light emitting surface 421 of the light guide plate 42 by the arrangement of the buffer layer 7, so as to improve the optical performance and the image quality, improve the service life, and improve the yield. In addition, by the arrangement of the buffer layer 7, the prism structure 62 does not need to be made of soft material to avoid the damage problem of the light guide plate 42, and meanwhile, the structure adsorption problem caused by the soft prism structure 62 can be avoided, so that the optical performance of the backlight module 3 is ensured. After the backlight module 3 is adopted by the display device 1, the display device can have good performance in the aspects of optical performance, image picture quality, service life, production yield and the like. Therefore, the backlight module 3 and the display device 1 using the backlight module 3 of the present invention can achieve the object of the present invention.
Claims (12)
1. A backlight module, comprising:
the light-emitting unit is provided with a light-emitting surface through which backlight rays can penetrate;
the prism unit comprises a base material and a plurality of prism structures arranged on the surface of the base material, and the prism structures face the light-emitting surface of the light-emitting unit; and
and the buffer layer is clamped between the light-emitting unit and the prism structure, and the prism structure is not contacted with the light-emitting surface of the light-emitting unit by the buffer layer.
2. A backlight module according to claim 1, wherein: the buffer layer is made of non-hard materials.
3. A backlight module according to claim 1, wherein: the buffer layer is made of a polymer composite material.
4. A backlight module according to claim 1, wherein: the buffer layer is made of at least one of terephthalate, polycarbonate, polymethyl methacrylate and triacetate fiber.
5. A backlight module according to claim 1, wherein: the refractive index of the buffer layer is between 1.4 and 1.7.
6. A backlight module according to claim 1, wherein: the buffer layer has a transmittance of not less than 80%.
7. A backlight module according to claim 1, wherein: the buffer layer has a haze of no greater than 10%.
8. A backlight module according to claim 1, wherein: the buffer layer has a thickness in a range of 12 to 300 microns.
9. A backlight module according to claim 1, wherein: the buffer layer has a thickness ranging from 30 micrometers to 200 micrometers.
10. A backlight module according to claim 1, wherein: the buffer layer has a thickness in a range of 35 microns to 125 microns.
11. A backlight module according to claim 1, wherein: the light emitting unit comprises a light source and a light guide plate, the light guide plate is provided with the light emitting surface, and the light source is arranged corresponding to the light emitting surface of the light guide plate; the buffer layer is arranged on the light emitting surface of the light guide plate.
12. A display device, comprising:
a backlight module according to any one of claims 1 to 11; and
the display module can receive the backlight light emitted by the backlight module to display an image picture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811610311.4A CN111381399A (en) | 2018-12-27 | 2018-12-27 | Backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811610311.4A CN111381399A (en) | 2018-12-27 | 2018-12-27 | Backlight module and display device |
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| Publication Number | Publication Date |
|---|---|
| CN111381399A true CN111381399A (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811610311.4A Pending CN111381399A (en) | 2018-12-27 | 2018-12-27 | Backlight module and display device |
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Citations (7)
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|---|---|---|---|---|
| US20030030372A1 (en) * | 2001-05-17 | 2003-02-13 | Dai Nippon Printing Co., Ltd. | Protective, diffusive film and process for producing the same |
| CN101072972A (en) * | 2004-12-08 | 2007-11-14 | 欧姆龙株式会社 | Surface light source device and liquid cristal display device using the same |
| JP2009047899A (en) * | 2007-08-20 | 2009-03-05 | Mitsubishi Rayon Co Ltd | Prism sheet, surface light source apparatus using the same, and liquid crystal display device using the same |
| CN202118702U (en) * | 2011-06-14 | 2012-01-18 | 华映视讯（吴江）有限公司 | Backlight module |
| CN206311869U (en) * | 2016-11-30 | 2017-07-07 | 华显光电技术（惠州）有限公司 | Bright enhancement film and backlight module |
| CN106970435A (en) * | 2017-05-04 | 2017-07-21 | 华显光电技术（惠州）有限公司 | Bright enhancement film and preparation method thereof, backlight module and display device |
| CN206863421U (en) * | 2017-06-27 | 2018-01-09 | 华显光电技术（惠州）有限公司 | Bright enhancement film, backlight module and display device |
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2018
- 2018-12-27 CN CN201811610311.4A patent/CN111381399A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030030372A1 (en) * | 2001-05-17 | 2003-02-13 | Dai Nippon Printing Co., Ltd. | Protective, diffusive film and process for producing the same |
| CN101072972A (en) * | 2004-12-08 | 2007-11-14 | 欧姆龙株式会社 | Surface light source device and liquid cristal display device using the same |
| JP2009047899A (en) * | 2007-08-20 | 2009-03-05 | Mitsubishi Rayon Co Ltd | Prism sheet, surface light source apparatus using the same, and liquid crystal display device using the same |
| CN202118702U (en) * | 2011-06-14 | 2012-01-18 | 华映视讯（吴江）有限公司 | Backlight module |
| CN206311869U (en) * | 2016-11-30 | 2017-07-07 | 华显光电技术（惠州）有限公司 | Bright enhancement film and backlight module |
| CN106970435A (en) * | 2017-05-04 | 2017-07-21 | 华显光电技术（惠州）有限公司 | Bright enhancement film and preparation method thereof, backlight module and display device |
| CN206863421U (en) * | 2017-06-27 | 2018-01-09 | 华显光电技术（惠州）有限公司 | Bright enhancement film, backlight module and display device |
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