CN110764184B - Backlight module, display panel and display device - Google Patents
Backlight module, display panel and display device Download PDFInfo
- Publication number
- CN110764184B CN110764184B CN201911193988.7A CN201911193988A CN110764184B CN 110764184 B CN110764184 B CN 110764184B CN 201911193988 A CN201911193988 A CN 201911193988A CN 110764184 B CN110764184 B CN 110764184B
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- light guide
- light
- backlight module
- plate
- connecting surface
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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
- G02B6/0081—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
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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
- G02B6/0081—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
- G02B6/0091—Positioning aspects of the light source relative to the light guide
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
Abstract
The invention provides a backlight module, a display panel and a display device. The reflector plate is used for reflecting the light generated by the light source, and the light guide plate is used for guiding the light generated by the light source. The light guide plate is provided with a notch facing the back plate, and the reflecting sheet is at least partially arranged in the notch. In the invention, the reflecting sheet is at least partially arranged in the notch of the light guide plate, so that the space occupied by the reflecting sheet is reduced, the product is thinned, and the loss of light in the light guide plate is reduced.
Description
Technical Field
The invention relates to the field of display, in particular to a backlight module, a display panel and a display device.
Background
The backlight module is widely used in the fields of, for example, liquid crystal displays, etc., as a key component of the display device. The liquid crystal is a passive light-emitting element, which does not emit light, but is illuminated by a backlight module below the liquid crystal. The backlight module, the liquid crystal and the shell are combined together to form the liquid crystal display device.
The reflecting sheet, the light guide plate, the optical film and other structures in the existing backlight module are arranged in a stacked mode, so that the thickness of the backlight module is large, the thickness of the display device is difficult to reduce, and the trend of thinning of current products is not met.
Disclosure of Invention
The invention provides a backlight module with reduced thickness, a display panel and a display device.
The invention provides a backlight module which comprises a back plate, a light source arranged on the back plate, a reflecting sheet and a light guide plate, wherein the reflecting sheet is used for reflecting light generated by the light source, the light guide plate is used for guiding the light generated by the light source, the light guide plate is provided with a notch facing the back plate, and at least part of the reflecting sheet is arranged in the notch.
Furthermore, the backlight module is provided with a first area and a second area, the light source is positioned in the second area, the reflector plate comprises a first reflection part positioned in the first area and a second reflection part positioned in the second area, and the second reflection part is positioned in the gap.
Further, the light guide plate includes a first light guide part and a second light guide part arranged along a light emitting direction of the backlight module, the reflector plate and the first light guide part are arranged along the light emitting direction, the reflector plate and the second light guide part are arranged along a transverse direction, and the transverse direction is perpendicular to the light emitting direction.
Further, the light source and the light guide plate are arranged along the transverse direction and abut against the first light guide part and the second light guide part, the second light guide part is located between the light source and the reflector plate, and the size of the light source in the light outgoing direction is equal to the sum of the sizes of the first light guide part and the second light guide part in the light outgoing direction.
Further, the lower surface of the reflector plate is flush with the lower surface of the light source, and the upper surface of the reflector plate is lower than the upper surface of the light source.
Further, the first light guide part includes a first lower surface, the second light guide part includes a second lower surface and a bridge surface connecting the first lower surface and the second lower surface, and the bridge surface is obliquely crossed with the light emitting direction.
Further, the dimension of the second lower surface in the transverse direction is not more than 1mm, the dimension of the bridge surface in the transverse direction is not more than 2mm, and the distance between the first lower surface and the second lower surface is not less than 0.08 mm.
The flexible printed circuit board is at least partially positioned between the first connecting element and the reflector plate, the first connecting element comprises a first connecting surface and a second connecting surface, the first connecting surface faces the reflector plate, the first connecting surface is connected with the reflector plate, the second connecting surface is connected with the flexible printed circuit board, the first connecting element supports the reflector plate through the first connecting surface, and the first connecting element supports the flexible printed circuit board through the second connecting surface.
Furthermore, the first connecting surface is higher than the second connecting surface, the upper surface of the flexible circuit board is flush with the first connecting surface, and the flexible circuit board supports the reflector plate.
Further, including gluing frame and second connecting element, the second connecting element includes that the third is connected face and fourth and is connected the face, the third is connected the face be less than the fourth connect the face and with first connection face parallel and level, the reflector plate connect in the third is connected the face, glue frame and light guide plate and connect the fourth is connected the face, the second connecting element passes through the third is connected the face and is in the face the reflector plate supports, the second connecting element passes through the fourth is connected the face and is in the face glue frame and light guide plate and support.
In another aspect, the present invention provides a display panel including the backlight module.
In yet another aspect, the present invention provides a display device comprising the display panel as described above.
In the invention, the reflecting sheet is at least partially arranged in the notch of the light guide plate, so that the space occupied by the reflecting sheet is reduced, the product is thinned, and the loss of light in the light guide plate is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a light guide plate of the backlight module shown in fig. 1.
FIG. 3 is a schematic structural diagram of a first connecting element of the backlight module shown in FIG. 1.
Fig. 4 is a schematic structural diagram of an embodiment of a display panel according to the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, the present invention provides a backlight module for a display panel and a display device, the backlight module having a first area a and a second area B. The first area a corresponds to a display area of the display panel, and the second area B corresponds to a bonding area (alternatively referred to as a non-display area) of the display panel. The backlight module comprises a back plate 1, a light source 2 arranged on the back plate, a reflector plate 3 and a light guide plate 4. The light source 2 is, for example, an LED light source, and is located in the second region B, the reflective sheet 3 is used for reflecting light generated by the light source 2, and the light guide plate 4 is used for guiding light generated by the light source 2. It should be noted that the light emitting direction of the present invention is from bottom to top. When the light emitting direction is changed, the up-down direction is changed.
The back plate 1 is a metal frame and is used for supporting other elements of the backlight module and a liquid crystal layer, the back plate 1 comprises a bottom wall 11, a first side wall 12 and a second side wall 13 which are connected with the bottom wall, and a top wall 14 which is connected with the first side wall 12, the bottom wall 11 is used for supporting elements such as the light source 2, the reflector plate 3 and the light guide plate 4, and the top wall 14 is used for supporting the liquid crystal layer.
Referring to fig. 1 and 2, the light guide plate 4 may be made of PC (polycarbonate), acrylic, or other materials, and includes a first light guide portion 41 and a second light guide portion 42. The light guide plate 4 further has a notch 40 facing the rear plate 1, and the second light guide part 42 is formed by extending downward from one end edge of the first light guide part, so as to form the notch 40 located below the first light guide part 41 and located at a side of the second light guide part 42. The reflective sheet 3 and the first light guide part 41 are arranged along a light emitting direction Y of the backlight module, and the reflective sheet 3 and the second light guide part 42 are arranged along a transverse direction X, where the transverse direction X is perpendicular to the light emitting direction Y. Because the reflector plate 3 is disposed in the notch 40 formed in the light guide plate 4, and does not occupy any space in the light exit direction Y, the thickness of the backlight module is reduced on the premise of not increasing the cost, which is beneficial to thinning the product, and meanwhile, the light loss of light in the light guide plate 4 is also reduced. In another embodiment, the reflective sheet 3 may be partially disposed in the notch 40 formed in the light guide plate 4.
In addition, because the reflector plate 3 sets up in the breach 40 that the light guide plate 4 formed, although the edge of reflector plate 3 sets up in second area B, nevertheless can not occupy flexible circuit board 6's space, allow the design of narrow frame, and when guaranteeing the narrow frame, guarantee good display effect, can not appear the display problems such as bright line, top white, shadow. In the present embodiment, the reflective sheet 3 includes a first reflective portion 31 located in the first area a and a second reflective portion 32 located in the second area B, the first reflective portion 31 and the second reflective portion 32 are used for reflecting light generated by the light source 2, and the second reflective portion 32 is located in the second area B without occupying a space of the flexible printed circuit board 6. Alternatively, as long as the edge of the reflective sheet 3 is located outside the 45-degree viewing angle of the display panel and cannot be viewed by a user, a good display effect can be ensured.
The light source 2 and the light guide plate 4 are arranged along the transverse direction X and abut against the first light guide portion 41 and the second light guide portion 42 (the two portions are separated by a dotted line in the figure for easy understanding, the dotted line does not exist actually), and the second light guide portion 42 is located between the light source 2 and the reflector sheet 3. The dimension of the light source 2 in the light outgoing direction Y is equal to the sum of the dimensions of the first light guide portion 41 and the second light guide portion 42 in the light outgoing direction Y. The lower surface of the reflector plate 3 is flush with the lower surface of the light source 2, and the upper surface of the reflector plate 3 is lower than the upper surface of the light source 2.
With reference to fig. 2, the first light guiding portion 41 includes a first lower surface 411, the second light guiding portion 42 includes a second lower surface 421 and a bridging surface 422 connecting the first lower surface 411 and the second lower surface 421, the bridging surface 422 is oblique to the light emitting direction Y, and the first lower surface 411 is parallel to the second lower surface 421 and perpendicular to the light emitting direction Y. The light generated by the light source 2 can completely enter the light guide plate through the first light guide part 41 and the second light guide part 42, and since the bridge surface 422 is an inclined surface, the light entering the second light guide part 42 is finally guided into the first light guide part 41 in the first region, so that the light generated by the light source can be guided out upward through the second light guide part 42, thereby avoiding light loss.
To meet the optical requirements and at the same time meet the assembly requirements of the reflective sheet 3, the dimension a of the second lower surface 421 in the transverse direction X is not greater than 1mm, the dimension b of the bridge surface 422 in the transverse direction X is not greater than 2mm, and the distance c between the first lower surface 411 and the second lower surface 421 is not less than 0.08 mm. Where the values of a and b may be determined by the size of the second area (corresponding to the bonding area). When the structure of the backlight module is changed, the values of a, b and c can be changed correspondingly.
Referring to fig. 1 and fig. 2, the backlight module further includes a flexible circuit board 6 disposed on the back plate 1, a plastic frame 7, an optical film 8, a first connecting element 51, and a second connecting element 52. Light generated by the light source 2 is guided by the light guide plate 4 and enters the optical film 8 upward, and enters the liquid crystal layer through the optical film 8.
Referring to fig. 1 and 3, the flexible circuit board 6 and the first connecting element 51 are located between the back plate 1 and the reflective sheet 3, and at least a portion of the flexible circuit board 6 is located between the first connecting element 51 and the reflective sheet 3, and the reflective sheet 3 and the flexible circuit board 6 are fixed by the first connecting element 51.
Optionally, the first connection element 51 includes a first connection surface 511 facing the reflection sheet 3, a second connection surface 512, and a vertical surface 513 connecting the first connection surface 511 and the second connection surface 512, the first connection surface 511 is connected to the reflection sheet 3, and the second connection surface 512 is connected to the flexible circuit board 6. The first connection surface 511 is higher than the second connection surface 512, and the first connection element 51 supports the reflection sheet 3 through the first connection surface 511. Of course, the first connection member 51 itself is supported by the back plate 1. The reflector plate 3 is supported, so that deformation caused by too large suspension cannot occur, the assembly difficulty cannot be increased by the assembly mode, and the yield of products cannot be influenced.
Preferably, the upper surface of the flexible circuit board 6 is flush with the first connection surface 511, that is, the flexible circuit board can also support the reflection sheet 3, so as to further avoid the deformation of the reflection sheet 3.
Referring to fig. 1, the second connecting element 52 includes a third connecting surface 521 and a fourth connecting surface 522, the third connecting surface 521 is lower than the fourth connecting surface 522 and is flush with the first connecting surface 511, the reflective sheet 3 abuts against the third connecting surface 521, the rubber frame 7 and the light guide plate 4 are connected to the fourth connecting surface 522, the second connecting element 52 supports the reflective sheet 3 through the third connecting surface 521, and the second connecting element 52 supports the rubber frame 7 and the light guide plate 4 through the fourth connecting surface 522. Optionally, the first connecting element 51 and the second connecting element 52 are both fixed tapes. For ease of assembly, one-sided tape was chosen for both.
The optical film 8 is disposed above the light guide plate 4, and can enhance the illuminance characteristics of the light output from the light guide plate 4. The optical film sheet 8 of the present embodiment may include a stacked combination of one or more of a diffusion sheet, a prism sheet, a Dual Brightness Enhancement Film (DBEF), and a lenticular sheet.
On the other hand, the invention also provides a display panel which comprises the backboard module of any one of the above embodiments. Referring to fig. 4, the display panel further includes a liquid crystal layer 9, and a third connecting element 53 and a fourth connecting element 54 for fixing the liquid crystal layer 9, wherein the third connecting element 53 and the fourth connecting element 54 support the liquid crystal layer 9. The third connecting element 53 has a rectangular cross section, the fourth connecting element 54 has an L-shaped cross section, and the fourth connecting element 54 can support different positions of the liquid crystal layer 9.
Of course, the display panel further includes a driving layer (not shown), such as a TFT device layer, which drives the liquid crystal layer after being powered on, so as to change the arrangement of the liquid crystal, and the light output by the optical film 8 passes through the liquid crystal layer 9 arranged in different ways, so as to present different images.
In another aspect, the present invention further provides a display device, where the display device includes the foregoing display panel, and of course, the display device further includes a frame, a support, a power supply, and other structures. The display device is, for example, a desktop display, a notebook computer, an all-in-one machine, and the like.
In the invention, the reflecting sheet is at least partially arranged in the notch of the light guide plate, so that the space occupied by the reflecting sheet is reduced, the product is thinned, and the loss of light in the light guide plate is reduced.
Although the present invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A backlight module is characterized by comprising a back plate, a light source arranged on the back plate, a reflecting sheet and a light guide plate, wherein the light guide plate is used for guiding light generated by the light source;
the light guide plate comprises a first light guide part and a second light guide part which are arranged along the light emergent direction of the backlight module, the reflector plate and the first light guide part are arranged along the light emergent direction, the reflector plate and the second light guide part are arranged along the transverse direction, and the transverse direction is perpendicular to the light emergent direction;
the light source and the light guide plate are arranged along the transverse direction and abut against the first light guide part and the second light guide part, and the second light guide part is positioned between the light source and the reflector plate;
the lower surface of the reflector plate is flush with the lower surface of the light source;
the backlight module further comprises a flexible circuit board and a first connecting element, wherein the flexible circuit board is positioned between the back plate and the reflector plate, at least part of the flexible circuit board is positioned between the first connecting element and the reflector plate, the first connecting element comprises a first connecting surface and a second connecting surface, the first connecting surface faces the reflector plate, the first connecting surface is connected with the reflector plate, the second connecting surface is connected with the flexible circuit board, the first connecting element supports the reflector plate through the first connecting surface, and the first connecting element supports the flexible circuit board through the second connecting surface;
the first connecting surface is higher than the second connecting surface, the upper surface of the flexible circuit board is flush with the first connecting surface, and the flexible circuit board supports the reflector plate.
2. The backlight module according to claim 1, wherein the backlight module has a first region and a second region, the light source is located in the second region, the reflective sheet comprises a first reflective portion located in the first region and a second reflective portion located in the second region, and the second reflective portion is located in the notch.
3. The backlight module according to claim 1, wherein a dimension of the light source in the light exiting direction is equal to a sum of dimensions of the first light guide portion and the second light guide portion in the light exiting direction.
4. A backlight module according to claim 3, wherein the upper surface of the reflector plate is lower than the upper surface of the light source.
5. The backlight module as claimed in claim 1, wherein the first light guide part includes a first lower surface, the second light guide part includes a second lower surface and a bridge surface connecting the first and second lower surfaces, and the bridge surface is oblique to the light emitting direction.
6. A backlight module according to claim 5, wherein the dimension of the second lower surface in the transverse direction is not greater than 1mm, the dimension of the bridge surface in the transverse direction is not greater than 2mm, and the distance between the first lower surface and the second lower surface is not less than 0.08 mm.
7. The backlight module according to claim 1, comprising a plastic frame and a second connecting member, wherein the second connecting member comprises a third connecting surface and a fourth connecting surface, the third connecting surface is lower than the fourth connecting surface and is flush with the first connecting surface, the reflective sheet is connected to the third connecting surface, the plastic frame and the light guide plate are connected to the fourth connecting surface, the second connecting member supports the reflective sheet through the third connecting surface, and the second connecting member supports the plastic frame and the light guide plate through the fourth connecting surface.
8. A display panel comprising the backlight module according to any one of claims 1 to 7.
9. A display device characterized by comprising the display panel according to claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911193988.7A CN110764184B (en) | 2019-11-28 | 2019-11-28 | Backlight module, display panel and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911193988.7A CN110764184B (en) | 2019-11-28 | 2019-11-28 | Backlight module, display panel and display device |
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| Publication Number | Publication Date |
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| CN110764184A CN110764184A (en) | 2020-02-07 |
| CN110764184B true CN110764184B (en) | 2021-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911193988.7A Active CN110764184B (en) | 2019-11-28 | 2019-11-28 | Backlight module, display panel and display device |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001043716A (en) * | 1999-07-28 | 2001-02-16 | Citizen Electronics Co Ltd | Surface light source unit |
| CN202884700U (en) * | 2012-10-26 | 2013-04-17 | 京东方科技集团股份有限公司 | Ultra thin double-sided backlight unit and liquid crystal display module thereof |
| TWI499845B (en) * | 2013-08-20 | 2015-09-11 | Au Optronics Corp | Thin type display module |
| CN104834050A (en) * | 2015-05-19 | 2015-08-12 | 武汉华星光电技术有限公司 | Light guide plate, backlight module and liquid crystal display device |
| CN208141089U (en) * | 2018-04-04 | 2018-11-23 | 昆山龙腾光电有限公司 | A kind of liquid crystal display device |
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2019
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