CN210090879U - Thin LED backlight module and display device - Google Patents
Thin LED backlight module and display device Download PDFInfo
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- CN210090879U CN210090879U CN201921060690.4U CN201921060690U CN210090879U CN 210090879 U CN210090879 U CN 210090879U CN 201921060690 U CN201921060690 U CN 201921060690U CN 210090879 U CN210090879 U CN 210090879U
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- guide plate
- light guide
- shaped light
- backlight module
- side wall
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Abstract
The utility model discloses a thinned LED backlight module, which comprises a light source, a U-shaped light guide plate, a reflecting film and a light homogenizing and brightening film system, wherein the reflecting film is arranged on one side wall of the U-shaped light guide plate and extends from one end of the side wall to the other end; the other side wall of the U-shaped light guide plate is formed by sequentially connecting a reflecting film, a light homogenizing and brightening film system and the reflecting film, wherein the light homogenizing and brightening film system is arranged on the side wall of the U-shaped light guide plate and is positioned on the same side of the display screen; the light source is arranged at the top of the U-shaped light guide plate, wherein the bottom of the U-shaped light guide plate is also provided with diffusion mesh points on the side wall opposite to the dodging and brightening film system. The thinned LED backlight module reduces the thickness of the backlight module in an effective display area on the basis of keeping the backlight module to have better light emitting efficiency and uniformity, and realizes the thinned design of the backlight module.
Description
Technical Field
The utility model relates to a LED backlight unit specifically, relates to a slimming LED backlight unit and display device.
Background
The backlight module is an indispensable component of the LCD, and the requirements for the backlight module are increasing with the development of LCD technology. In the special display field, especially the airborne display field, the product requirement is high, and the product is required to be small in size, low in power consumption, high in brightness, high in color gamut, uniform in light emission, high in reliability and the like. The thickness of the backlight module is a main factor for limiting the thickness of the whole liquid crystal display module, so that the backlight module applied to airborne display is required to be thinned as much as possible while index requirements are ensured, and the size of the whole display module is reduced.
The backlight module includes a direct type backlight and a side type backlight, and the direct type backlight has a spatial light mixing distance from a light source to an optical film, so that research for improving the thinning of the backlight module focuses on the design of the backlight plate to reduce the light mixing distance, that is, the height of the backlight part. The side-in type backlight module is characterized in that a light guide plate is added, light is diffused to the surface by means of total reflection, and then the total reflection structure is destroyed by diffusion mesh points at the bottom of the light guide plate, so that the purpose of light ray emergence is achieved. Even so, in the existing side-in type backlight module, in a specific arrangement structure, the light incident side is communicated with the backlight portion in parallel, the width of the light incident side is the same as the width of the backlight portion (i.e. the portion in the effective display area), and since the width required by the light incident side is relatively large, the width of the backlight portion cannot be further narrowed, that is, the thinning transformation is difficult, and in addition, the light emitting efficiency and uniformity need to be maintained while the thinning is performed, so that the thinning implementation is more difficult.
Based on this, the utility model discloses an it sets up the mode to change the income light side among the backlight unit among the prior art and partial with being shaded to provide a slimming liquid crystal display backlight unit, on keeping that backlight unit has better luminous efficiency and homogeneity the basis, reduced the backlight unit thickness in the effective display area (the regional that partial and display screen of being shaded correspond promptly), realize backlight unit's slimming design.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a slimming LED backlight unit and display device, on keeping backlight unit to have the basis of better luminous efficiency and homogeneity, reduce backlight unit's in the effective display area (the region that partly corresponds with the display screen in being shaded promptly) thickness, realize backlight unit's slimming design.
In order to achieve the above object, the present invention provides a thinned LED backlight module, which includes a light source, a U-shaped light guide plate, a reflective film and a light-equalizing and brightness-increasing film system, wherein the reflective film is disposed on one of the sidewalls of the U-shaped light guide plate and extends from one end of the sidewall to the other end; the other side wall of the U-shaped light guide plate is formed by sequentially connecting a reflecting film, a light homogenizing and brightening film system and the reflecting film, wherein the light homogenizing and brightening film system is arranged on the side wall of the U-shaped light guide plate and is positioned on the same side of the display screen; the light source is arranged at the top of the U-shaped light guide plate, wherein the bottom of the U-shaped light guide plate is also provided with diffusion mesh points on the side wall opposite to the dodging and brightening film system.
Preferably, the width of the bottom of the end of the U-shaped light guide plate is smaller than that of the top.
Preferably, the chamfer radius of the bottom of the outer side wall of the U-shaped light guide plate is 5-7 mm.
Preferably, the chamfer radius of the bottom of the inner side wall of the U-shaped light guide plate is 4-5 mm.
Preferably, the thickness of the U-shaped light guide plate positioned in the effective display area part is 1-2 mm.
Preferably, the width of the end part of the U-shaped light guide plate is 2.8-3.2 mm.
Preferably, the light source includes a backlight printed board and an LED lamp, wherein the backlight printed board is located at the top of the U-shaped light guide plate, and the LED lamp is disposed below the backlight printed board.
Preferably, the light source comprises a flexible strip and an LED lamp, wherein the flexible strip is located at the top of the U-shaped light guide plate, and the LED lamp is disposed below the flexible strip.
Preferably, the U-shaped light guide plate is made of polymethyl methacrylate.
The utility model also provides a display device, including the display screen, do the display screen provides the foreland in a poor light slim LED backlight unit.
In the above technical solution, light emitted from the light source at the top of the U-shaped light guide plate is incident on the curved surface at the side of the U-shaped light guide plate 3 and is totally reflected to enter the bottom of the U-shaped light guide plate, that is, the effective display area corresponding to the display screen; the reflecting film is arranged on one side wall of the U-shaped light guide plate and extends from one end to the other end of the side wall, and the reflecting film can reflect light which is not totally reflected by the U-shaped light guide plate and is dissipated to an effective display area so as to increase the light efficiency; the diffusion screen points and the light-homogenizing brightness-increasing film system in the effective display area realize the purpose of further light homogenizing and efficiency increasing, so that the backlight module has better light-emitting efficiency and uniformity.
The utility model discloses the both ends of the U type light guide plate of well slimming LED backlight unit both sides have realized going into the effect of light side, and the effect of the part in a poor light has been realized to the bottom of U type light guide plate, and like this, the curved surface structure of bottom side makes the part in a poor light of bottom and the income light side of broad can be compatible. Therefore, the limitation of the width of the light incident side is not limited, the thickness of the obtained backlight part is reduced, namely the thickness of the backlight part corresponding to the display screen in parallel is reduced, the thickness of the backlight module in an effective display area (namely the area of the backlight part corresponding to the display screen) is reduced, and the thinning design of the backlight module is realized. And the width of the light incident side is transferred to the frame vertical to the display screen, so that the light incident side can be hidden under the key light guide panel positioned on the frame of the display module, and the existing width of the display equipment can not be increased.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view of a thinned LED backlight module according to a preferred embodiment of the present invention;
fig. 2 is a thin LED backlight module according to another preferred embodiment of the present invention.
Description of the reference numerals
1 backlight printed board or flexible belt 2 LED lamp
3U type light guide plate 4 reflective film
5 light-homogenizing brightening film system 6 diffusion mesh points
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
In the present invention, unless otherwise specified, the terms "upper, lower, top, side, and the like" included in the terms "an" and "an" merely represent the orientation of the terms in a conventional use state or are colloquially known by those skilled in the art, and should not be construed as limiting the terms.
As shown in fig. 1 and fig. 2, the present invention provides a thinned LED backlight module, which includes a light source, a U-shaped light guide plate 3, a reflective film 4 and a light-homogenizing and brightness-enhancing film system 5, wherein the reflective film 4 is disposed on one of the sidewalls of the U-shaped light guide plate 3 and extends from one end of the sidewall to the other end; the other side wall of the U-shaped light guide plate 3 is formed by sequentially connecting a reflecting film 4, a light-homogenizing and brightness-increasing film system 5 and the reflecting film 4, wherein the light-homogenizing and brightness-increasing film system 5 is arranged on the side wall of the U-shaped light guide plate 3 and is positioned on the same side of the display screen; the light source is arranged at the top of the U-shaped light guide plate 3, wherein the bottom of the U-shaped light guide plate 3 and the side wall opposite to the dodging and brightening film system 5 are also provided with diffusion mesh points 6. Thus, light emitted by the light source at the top of the U-shaped light guide plate 3 is incident on the curved surface at the side of the U-shaped light guide plate 3 to be totally reflected and enter the bottom of the U-shaped light guide plate 3, namely, an effective display area corresponding to the display screen; the reflecting film 4 is arranged on one side wall of the U-shaped light guide plate 3 and extends from one end of the side wall to the other end of the side wall, and the reflecting film 4 can reflect light which is not totally reflected by the U-shaped light guide plate 3 and is dissipated to an effective display area so as to increase the light efficiency; the diffusing screen dots 6 and the light-homogenizing brightness-enhancing film system 5 in the effective display area realize the purpose of further light homogenizing and enhancing effect, so that the backlight module has better light-emitting efficiency and uniformity.
The utility model discloses the effect of going into the light side has been realized at the both ends of the U type light guide plate 3 of well slimming LED backlight unit both sides, and the effect of the part in a poor light has been realized to the bottom of U type light guide plate 3, and like this, the curved surface structure of bottom side makes the part in a poor light of bottom and the income light side of broad can be compatible. Therefore, the limitation of the width of the light incident side is not limited, the thickness of the obtained backlight part is reduced, namely the thickness of the backlight part corresponding to the display screen in parallel is reduced, the thickness of the backlight module in an effective display area (namely the area of the backlight part corresponding to the display screen) is reduced, and the thinning design of the backlight module is realized. And the width of the light incident side is transferred to the frame vertical to the display screen, so that the light incident side can be hidden under the key light guide panel positioned on the frame of the display module, and the existing width of the display equipment can not be increased.
In the present invention, the U-shape of the U-shaped light guide plate 3 refers to the structure on the cross section, and in the other dimension perpendicular to the cross section, the U-shaped light guide plate extends forward along the direction perpendicular to the cross section, and the display screen is located on the plane formed by the U-shaped structure bottom extending forward along the direction perpendicular to the cross section.
In an embodiment of the present invention, as shown in fig. 1, one side of the light uniformizing and brightness enhancing film system 5 facing the U-shaped opening of the U-shaped light guide plate 3 is the same side as the display screen. In another embodiment of the present invention, the U-shaped opening of the U-shaped light guide plate 3 faces a side away from the dodging film 5, i.e. a side different from the display screen. The purpose of the utility model can be realized by the two modes.
In a preferred embodiment of the present invention, the width of the bottom of the end of the U-shaped light guide plate 3 is smaller than the width of the top. Therefore, light rays on the side walls at two ends of the U-shaped light guide plate can be reflected to the bottom in the reflection process and finally enter the effective display area to increase the lighting effect.
Further preferably, the end of the U-shaped light guide plate 3 is in a shape of a large horn with an upward opening. The included angle range of the horn-shaped tangent line and the extension line of the side wall of the bottom is 44-46 degrees (the tangent line at the middle point of the arc outside the horn). Therefore, light rays on the side walls at the two ends of the U-shaped light guide plate 3 can be downward in the reflection process and finally enter the effective display area, so that the luminous efficiency is further increased.
The utility model relates to an in the preferred embodiment, the chamfer radius of the lateral wall bottom of U type light guide plate 3 is 5 ~ 7 mm. This enables light to further enter the effective display area to further increase the light efficiency.
The utility model relates to an in the preferred embodiment, the chamfer radius of the inside wall bottom of U type light guide plate 3 is 4 ~ 5 mm. This enables light to further enter the effective display area to further increase the light efficiency.
In a preferred embodiment of the present invention, the thickness of the U-shaped light guide plate 3 located in the effective display area is 1 to 2 mm. Compared with the prior art, greatly reduced backlight unit's thickness, this has brought sufficient space allowance for the assembly of each inside subassembly of display module, has improved the product yield to reduce the weight of complete machine, promoted product market competition.
In a preferred embodiment of the present invention, the width of the end of the U-shaped light guide plate 3 is 2.8 to 3.2 mm. Therefore, the thickness of the backlight module is not increased, the light mixing space can be effectively increased, and the generation of lamp shadow is inhibited.
Furthermore, in the prior art, due to the limitation of the thickness of the conventional flat light guide plate, the width of the light incident side is narrow, so that the 3528 packaged LED which is relatively economical and high in light efficiency but large in volume cannot be applied. And the utility model discloses because the income light side that has the broad, consequently, can be applicable to the LED of 3528 encapsulation, this has further reduced LED backlight unit's manufacturing cost again.
In a preferred embodiment of the present invention, the light source includes a backlight printed board 1 and LED lamps 2, wherein the backlight printed board 1 is located at the top of the U-shaped light guide plate 3, and the LED lamps 2 are disposed below the backlight printed board 1.
In a preferred embodiment of the present invention, the light source includes a flexible strip 1 and an LED lamp 2, wherein the flexible strip 1 is located on the top of the U-shaped light guide plate 3, and the LED lamp 2 is disposed below the flexible strip 1.
In a preferred embodiment of the present invention, the U-shaped light guide plate 3 is made of polymethyl methacrylate.
The utility model also provides a display device, including the display screen, do the display screen provides the foreland in a poor light slim LED backlight unit. The thinned LED backlight module comprises a light source, a U-shaped light guide plate 3, a reflecting film 4 and a light homogenizing and brightening film system 5, wherein the reflecting film 4 is arranged on one side wall of the U-shaped light guide plate 3 and extends from one end to the other end of the side wall; the other side wall of the U-shaped light guide plate 3 is formed by sequentially connecting a reflecting film 4, a light-homogenizing and brightness-increasing film system 5 and the reflecting film 4, wherein the light-homogenizing and brightness-increasing film system 5 is arranged on the side wall of the U-shaped light guide plate 3 and is positioned on the same side of the display screen; the light source is arranged at the top of the U-shaped light guide plate 3, wherein the bottom of the U-shaped light guide plate 3 and the side wall opposite to the dodging and brightening film system 5 are also provided with diffusion mesh points 6. Thus, light emitted by the light source at the top of the U-shaped light guide plate 3 is incident on the curved surface at the side of the U-shaped light guide plate 3 to be totally reflected and enter the bottom of the U-shaped light guide plate 3, namely, an effective display area corresponding to the display screen; the reflecting film 4 is arranged on one side wall of the U-shaped light guide plate 3 and extends from one end of the side wall to the other end of the side wall, and the reflecting film 4 can reflect light which is not totally reflected by the U-shaped light guide plate 3 and is dissipated to an effective display area so as to increase the light efficiency; the diffusing screen dots 6 and the light-homogenizing brightness-enhancing film system 5 in the effective display area realize the purpose of further light homogenizing and enhancing effect, so that the backlight module has better light-emitting efficiency and uniformity.
The utility model discloses the both ends of the U type light guide plate of well slimming LED backlight unit both sides have realized going into the effect of light side, and the effect of the part in a poor light has been realized to the bottom of U type light guide plate, and like this, the curved surface structure of bottom side makes the part in a poor light of bottom and the income light side of broad can be compatible. Therefore, the limitation of the width of the light incident side is not limited, the thickness of the obtained backlight part is reduced, namely the thickness of the backlight part corresponding to the display screen in parallel is reduced, the thickness of the backlight module in an effective display area (namely the area of the backlight part corresponding to the display screen) is reduced, and the thinning design of the backlight module is realized. And the width of the light incident side is transferred to the frame vertical to the display screen, so that the light incident side can be hidden under the key light guide panel positioned on the frame of the display module, and the existing width of the display equipment can not be increased.
In an embodiment of the present invention, as shown in fig. 1, one side of the light uniformizing and brightness enhancing film system 5 facing the U-shaped opening of the U-shaped light guide plate 3 is the same side as the display screen. In another embodiment of the present invention, the U-shaped opening of the U-shaped light guide plate 3 faces a side away from the dodging film 5, i.e. a side different from the display screen. The purpose of the utility model can be realized by the two modes.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention to perform various simple modifications to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the present invention does not need to describe any combination of the features.
In addition, various embodiments of the present invention can be combined arbitrarily, and the disclosed content should be regarded as the present invention as long as it does not violate the idea of the present invention.
Claims (10)
1. The thin LED backlight module is characterized by comprising a light source, a U-shaped light guide plate (3), a reflecting film (4) and a light homogenizing and brightening film system (5), wherein the reflecting film (4) is arranged on one side wall of the U-shaped light guide plate (3) and extends from one end to the other end of the side wall; the other side wall of the U-shaped light guide plate (3) is formed by sequentially connecting a reflecting film (4), a light-homogenizing and brightening film system (5) and the reflecting film (4), wherein the light-homogenizing and brightening film system (5) is arranged on the side wall of the U-shaped light guide plate (3) and is positioned on the same side of the display screen; the light source is arranged at the top of the U-shaped light guide plate (3), wherein the bottom of the U-shaped light guide plate (3) and the side wall opposite to the dodging and brightening film system (5) are also provided with diffusion mesh points (6).
2. The thin LED backlight module as claimed in claim 1, wherein the width of the bottom of the end of the U-shaped light guide plate (3) is smaller than the width of the top.
3. The thinned LED backlight module as claimed in claim 2, wherein the chamfer radius of the bottom of the outer sidewall of the U-shaped light guide plate (3) is 5-7 mm.
4. The thinned LED backlight module as claimed in claim 3, wherein the chamfer radius of the bottom of the inner side wall of the U-shaped light guide plate (3) is 4-5 mm.
5. The thin LED backlight module as claimed in any one of claims 1 to 4, wherein the thickness of the U-shaped light guide plate (3) in the effective display area is 1-2 mm.
6. The thinned LED backlight module as claimed in any one of claims 1 to 4, wherein the width of the end of the U-shaped light guide plate (3) is 2.8-3.2 mm.
7. The thinned LED backlight module according to any one of claims 1 to 4, wherein the light source comprises a backlight printed board (1) and LED lamps (2), wherein the backlight printed board (1) is positioned on the top of the U-shaped light guide plate (3), and the LED lamps (2) are arranged below the backlight printed board (1).
8. The thinned LED backlight module according to any one of claims 1 to 4, wherein the light source comprises a flexible strip and LED lamps (2), wherein the flexible strip is positioned on the top of the U-shaped light guide plate (3), and the LED lamps (2) are arranged below the flexible strip.
9. The thinned LED backlight module as claimed in any one of claims 1 to 4, wherein the U-shaped light guide plate (3) is made of polymethyl methacrylate.
10. A display device, comprising a display screen, wherein the thinned LED backlight module of any one of claims 1 to 9 for providing backlight to the display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921060690.4U CN210090879U (en) | 2019-07-08 | 2019-07-08 | Thin LED backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921060690.4U CN210090879U (en) | 2019-07-08 | 2019-07-08 | Thin LED backlight module and display device |
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| Publication Number | Publication Date |
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| CN210090879U true CN210090879U (en) | 2020-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921060690.4U Active CN210090879U (en) | 2019-07-08 | 2019-07-08 | Thin LED backlight module and display device |
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| CN (1) | CN210090879U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116559994A (en) * | 2023-05-31 | 2023-08-08 | 青岛鼎信通讯股份有限公司 | Backlight module and electric energy meter |
-
2019
- 2019-07-08 CN CN201921060690.4U patent/CN210090879U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116559994A (en) * | 2023-05-31 | 2023-08-08 | 青岛鼎信通讯股份有限公司 | Backlight module and electric energy meter |
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