CN117991547A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
- Publication number
- CN117991547A CN117991547A CN202410141773.5A CN202410141773A CN117991547A CN 117991547 A CN117991547 A CN 117991547A CN 202410141773 A CN202410141773 A CN 202410141773A CN 117991547 A CN117991547 A CN 117991547A
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- guide plate
- light guide
- circuit board
- backboard
- backlight module
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- 239000010410 layer Substances 0.000 claims abstract description 37
- 239000012790 adhesive layer Substances 0.000 claims abstract description 22
- 241000254158 Lampyridae Species 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 239000010408 film Substances 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 230000037303 wrinkles Effects 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003190 augmentative effect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Planar Illumination Modules (AREA)
Abstract
The application provides a backlight module and a display device. The circuit board is positioned at one side of the first backboard along the first direction; the light emitting unit and the light guide plate are positioned at one side of the circuit board away from the first backboard, and the light emitting unit is positioned at the side of the light guide plate along the second direction; the adhesive layer is located between the circuit board and the light guide plate, and the supporting layer is located between the first backboard and the circuit board. Through inserting the supporting layer between first backplate and circuit board, can raise the overall height of the luminous unit on the circuit board for the activity space of luminous unit in the first direction reduces, thereby can reduce the difference in height of luminous unit in the first direction that the circuit board fold caused, in order to alleviate firefly bad.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a backlight module and a display device.
Background
The backlight module can experience high temperature and low temperature when performance test is carried out, the light guide plate and the circuit board are fixed by the lamp glue, but because the shrinkage expansion rates of the light guide plate and the circuit board are inconsistent, the circuit board is easy to generate folds to cause firefly failure.
Disclosure of Invention
The application aims to provide a backlight module and a display device, which aim to reduce the bad risk of fireflies caused by circuit board folds.
In one aspect, the present application provides a backlight module, including:
A first back plate;
The circuit board is positioned at one side of the first backboard along the first direction;
the light emitting unit and the light guide plate are positioned on one side of the circuit board away from the first backboard, and the light emitting unit is positioned on the side edge of the light guide plate along a second direction, and the second direction is perpendicular to the first direction;
The adhesive layer is positioned between the circuit board and the light guide plate;
And the supporting layer is positioned between the first backboard and the circuit board.
In some embodiments, the orthographic projection of the light emitting unit on the first back plate is located within the orthographic projection of the support layer on the first back plate.
In some embodiments, the backlight module further comprises:
the first reflector plate comprises a first body part, a first extension part and a first sinking part, wherein the first body part is positioned between the light guide plate and the first backboard, the first extension part is positioned between the circuit board and the first backboard, and the first sinking part is connected with the first body part and the first extension part;
The distance between the surface of the first extension part, which is close to one side of the light guide plate, and the light guide plate is larger than the distance between the surface of the first body part, which is close to one side of the light guide plate, and the light guide plate; the support layer includes the first extension.
In some embodiments, the first back plate comprises:
the second body part is positioned at one side of the first body part far away from the light guide plate;
The second extension part is positioned at one side of the first extension part far away from the circuit board;
a second sinking portion connecting the second body portion and the second extension portion;
The distance between the surface of the second extension part, which is close to one side of the light guide plate, and the light guide plate is greater than the distance between the surface of the second body part, which is close to one side of the light guide plate, and the light guide plate.
In some embodiments, a distance between a surface of the second extension portion on a side close to the light guide plate and a surface of the second body portion on a side close to the light guide plate is equal to a distance between a surface of the first extension portion on a side close to the light guide plate and a surface of the first body portion on a side close to the light guide plate.
In some embodiments, a distance between a surface of the first extension portion near the light guide plate and a surface of the first body portion near the light guide plate is smaller than a dimension of the support layer along the first direction.
In some embodiments, the backlight module further comprises:
the second backboard is positioned at one side of the light guide plate and the light emitting unit away from the first backboard;
a third back plate connected to edges of the first back plate and the second back plate and disposed along the first direction;
the light emitting unit, the light guide plate, the circuit board, the adhesive layer and the supporting layer are contained in a space surrounded by the first backboard, the second backboard and the third backboard.
In some embodiments, the backlight module further comprises:
the second reflecting sheet is positioned on one side of the second backboard, which is close to the first backboard;
the distance between the light emitting unit and the second reflecting sheet is smaller than a preset distance.
In some embodiments, the light emitting units are arranged at intervals along a third direction on the side edge of the light guide plate, and the third direction is perpendicular to the first direction and the second direction; and the orthographic projection of the adhesive layer on the third backboard is positioned between the orthographic projections of the adjacent two light-emitting units on the third backboard.
In another aspect, the present application provides a backlight module and a display device, where the display device includes the backlight module in any of the above embodiments.
The application provides a backlight module and a display device. The circuit board is positioned at one side of the first backboard along the first direction; the light emitting unit and the light guide plate are positioned at one side of the circuit board away from the first backboard, and the light emitting unit is positioned at the side of the light guide plate along the second direction; the adhesive layer is located between the circuit board and the light guide plate, and the supporting layer is located between the first backboard and the circuit board. Through inserting the supporting layer between first backplate and circuit board, can raise the overall height of the luminous unit on the circuit board for the activity space of luminous unit in the first direction reduces, thereby can reduce the difference in height of luminous unit in the first direction that the circuit board fold caused, in order to alleviate firefly bad.
Drawings
The technical solution and other advantageous effects of the present application will be made apparent by the following detailed description of the specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a backlight module according to some embodiments of the present application;
Fig. 2 is a schematic diagram of an arrangement structure of a glue layer and a light emitting unit according to some embodiments of the present application;
fig. 3 is a schematic structural diagram of a backlight module according to some embodiments of the application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different features of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a backlight module according to some embodiments of the application. The backlight module 100 can be applied to various electronic devices, such as wearable devices, e.g., smart bracelets, smart watches, augmented Reality (Augmented Reality, AR), virtual Reality (VR), mobile phones, electronic books and newspapers, televisions, personal portable computers, foldable and rollable flexible display and lighting devices.
The backlight module 100 includes a first back plate 10, a circuit board 20, a light emitting unit 30, a light guide plate 40, an adhesive layer 50 and a supporting layer 60. The circuit board 20 is located at one side of the first back plate 10 along the first direction (X); the light emitting unit 30 and the light guide plate 40 are positioned at a side of the circuit board 20 away from the first back plate 10, and the light emitting unit 30 is positioned at a side of the light guide plate 40 along the second direction (Y); an adhesive layer 50 is located between the circuit board 20 and the light guide plate 40, and a supporting layer 60 is located between the first back plate 10 and the circuit board 20.
The backlight module 100 may further include a second back plate 11 and a third back plate 12, the second back plate 11 is located at a side of the light guide plate 40 and the light emitting unit 30 away from the first back plate 10, and the third back plate 12 is connected to edges of the first back plate 10 and the second back plate 11 and disposed along the first direction (X). The first back plate 10, the second back plate 11 and the third back plate 12 may be one piece. Wherein the light emitting unit 30, the light guide plate 40, the circuit board 20, the adhesive layer 50 and the supporting layer 60 are accommodated in a space surrounded by the first back plate 10, the second back plate 11 and the third back plate 12.
The circuit board 20 may include a flexible printed circuit board (Flexible Printed Circuit, PFC) for controlling the light emission of the light emitting unit 30, and the light emitting unit 30 is soldered to a side of the flexible printed circuit board 20 remote from the first back plate 10.
The light emitting unit 30 may include a light emitting Diode display (LIGHT EMITTING Diode, LED) or other suitable light source.
The light guide plate 40 can conduct the light emitted from the light emitting unit 30 at the side thereof, and the adhesive layer 50 is used for fixing the light guide plate 40 and the circuit board 20, so that the adhesive layer 50 and the light emitting unit 30 are both positioned on the circuit board 20.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating an arrangement structure of a glue layer and a light emitting unit according to some embodiments of the present application.
In some embodiments, the light emitting units 30 are spaced apart from each other along a third direction (Z) on the side of the light guide plate 40, and the adhesive layers 50 are spaced apart from each other along the third direction (Z), wherein the third direction (Z) is perpendicular to the first direction (X) and the second direction (Y). The orthographic projection of the adhesive layer 50 on the third back plate 12 (XZ plane) is located between the orthographic projections of two adjacent light emitting units 30 on the third back plate 12 (XZ plane), that is, the adhesive layer 50 and the light emitting units 30 are arranged at intervals along the third direction (Z), but the adhesive layer 50 is offset by a distance along the third direction (Z) relative to the light emitting units 30, so that the adhesive layer 50 and the light emitting units 30 are not aligned along the second direction (Y), and the adhesive layer 50 will not affect the light emitted by the light emitting units 30.
The backlight module 100 may further include a light shielding adhesive 70 and a backlight film 80, wherein the light shielding adhesive 70 is located on one side of the second back plate 11 away from the first back plate 10, and the backlight film 80 is located on one side of the light guide plate 40 away from the first back plate 10 and is disposed adjacent to the light shielding adhesive 70 and the second back plate 11. The area where the backlight film 80 is located may be a light emitting area of the backlight module 100, the backlight film 80 may include three or four optical film layers, and the area where the light shielding glue 70 is located may be a light entering area of the backlight module 100.
In some embodiments, support layer 60 may comprise a hard material such as polyethylene terephthalate (PET).
In some embodiments, the orthographic projection of the light emitting unit 30 on the first back plate 10 is located within the orthographic projection of the support layer 60 on the first back plate 10.
In some embodiments, the backlight module 100 may further include a first reflective sheet 90, where the first reflective sheet 90 is located between the light guide plate 40 and the first back plate 10, i.e. in the light emitting area. As shown in fig. 1, the first reflection sheet 90 is disposed apart from the support layer 60 on the first back plate 10. In some embodiments, the first back plate 10 may include a second body portion 101, a second extension portion 102, and a second sinking portion 103, where the second body portion 101 is located at a side of the first reflective sheet 90 away from the light guide plate 40, the second extension portion 102 is located at a side of the support layer 60 away from the circuit board 20, and the second sinking portion 103 connects the second body portion 101 and the second extension portion 102. The distance between the surface of the second extension 102 near the light guide plate 40 and the light guide plate 40 is greater than the distance between the surface of the second body 101 near the light guide plate 40 and the light guide plate 40, that is, the second extension 102 is farther from the light guide plate 40 relative to the second body 101, so as to reserve a space for the supporting layer 60.
In some embodiments, a distance between a surface of the second extension 102 near the light guide plate 40 and a surface of the second body 101 near the light guide plate 40 is smaller than a dimension of the support layer 60 along the first direction (X). That is, the dimension of the second extension 102 sinking in the first direction (X) with respect to the second body portion 101, i.e., the height difference between the second extension 102 (upper surface) and the second body portion 101 (upper surface), is smaller than the dimension (i.e., thickness) of the support layer 60in the first direction (X), so that the insertion of the support layer 60 can be ensured to raise the circuit board 20 and the light emitting unit 30.
The inventor researches that the backlight module is subjected to high and low temperature environments during performance test, and at this time, the light guide plate 40 and the circuit board 20 are shrunk and expanded, but the shrinkage and expansion rates of the light guide plate 40 and the circuit board 20 are inconsistent, so that the circuit board 20 can be wrinkled at the position without the adhesive layer 50. The wrinkles of the circuit board 20 may cause the heights of the light emitting units 30 at different positions to be different, which may cause firefly defect.
In some embodiments, the backlight module 100 further includes a second reflective sheet 110, where the second reflective sheet 110 is located on a side of the second back plate 11 near the first back plate 10. Specifically, the second reflective sheet 110 is located between the light emitting unit 30 and the second back plate 11, and also between the light guide plate 40 and the second back plate 11, and the second reflective sheet 110 may be adhered to the second back plate 11 through the double-sided tape 120. Wherein a distance between the light emitting unit 30 and the second reflection sheet 110 is less than a preset distance.
Since the supporting layer 60 may raise the entire height of the light emitting unit 30, the distance between the light emitting unit 30 and the second reflecting sheet 110 may be made smaller than a preset distance, and even the light emitting unit 30 may directly contact the second reflecting sheet 110. This can reduce the moving space of the light emitting unit 30 in the first direction (X), and even if the circuit board 20 generates wrinkles, it can reduce the height difference of the light emitting unit 30 due to the wrinkles, thereby improving firefly defect.
The preset distance may be smaller than a height difference of the circuit board 20 due to the wrinkles, so the preset distance may be determined according to an experiment or an actual situation.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a backlight module according to some embodiments of the application. For the sake of understanding and brevity, the same structures of the present embodiment as those of the above embodiment continue to be given the same reference numerals, and the same structures will not be described in detail, but only the different structures will be described in detail.
The backlight module 200 is different from the embodiment in fig. 1 in that the first reflective sheet 90a includes a first body portion 91, a first extension portion 92 and a first sinking portion 93, the first body portion 91 is located between the light guide plate 40 and the first back plate 10, the first extension portion 92 is located between the circuit board 20 and the first back plate 10, and the first sinking portion 93 connects the first body portion 91 and the first extension portion 92. Wherein, the distance between the surface of the first extension 92 near the light guide plate 40 and the light guide plate 40 is greater than the distance between the surface of the first body 91 near the light guide plate 40 and the light guide plate 40. The support layer 60 includes the first extension 92. In one embodiment, the first extension 92 may be directly used as the support layer 60.
Since the circuit board 20 also transmits light, the first extending portion 92 is disposed between the circuit board 20 and the first back plate 10 by extending the first reflecting sheet 90a from the light emitting area to the light entering area, so that light can be prevented from transmitting through the circuit board 20, reflectivity of the light can be improved, and backlight brightness can be improved by 3-5%.
In some embodiments, a distance between a surface of the first extension 92 adjacent to the light guide plate 40 and a surface of the first body 91 adjacent to the light guide plate 40 is smaller than a dimension of the support layer 60 along the first direction (X). In other words, the dimension of the first extension 92 sinking in the first direction (X) with respect to the first body portion 91, i.e., the height difference between the first extension 92 (upper surface) and the first body portion 91 (upper surface), is smaller than the dimension (i.e., thickness) of the support layer 60 in the first direction (X), which can ensure that the insertion of the support layer 60 can raise the circuit board 20 and the light emitting unit 30.
In some embodiments, the distance between the surface of the second extension 102 near the light guide plate 40 and the surface of the second body 101 near the light guide plate 40 is equal to the distance between the surface of the first extension 92 near the light guide plate 40 and the surface of the first body 91 near the light guide plate 40. It will be appreciated that the dimension of the second extension 102 sinking in the first direction (X) relative to the second body portion 101 is equal to the dimension of the first extension 92 sinking in the first direction (X) relative to the first body portion 91. That is, the height difference between the second extension portion 102 and the second body portion 101 may be equal to the height difference between the first extension portion 92 and the first body portion 91.
The backlight module provided by the embodiment of the application comprises a first back plate 10, a circuit board 20, a light emitting unit 30, a light guide plate 40, an adhesive layer 50 and a supporting layer 60. The circuit board 20 is located at one side of the first back plate 10 along the first direction (X); the light emitting unit 30 and the light guide plate 40 are positioned at a side of the circuit board 20 away from the first back plate 10, and the light emitting unit 30 is positioned at a side of the light guide plate 40 along the second direction (Y); an adhesive layer 50 is located between the circuit board 20 and the light guide plate 40, and a supporting layer 60 is located between the first back plate 10 and the circuit board 20. By inserting the supporting layer 60 between the first back plate 10 and the circuit board 20, the overall height of the light emitting unit 30 on the circuit board 20 can be raised, so that the moving space of the light emitting unit 30 in the first direction (X) is reduced, and thus the height difference of the light emitting unit 30 in the first direction (X) caused by the folds of the circuit board 20 can be reduced, so as to alleviate firefly defects.
On the other hand, the embodiment of the application also provides a display device, which comprises the backlight module provided by any one of the embodiments. The display device has the same beneficial effects as the backlight module, and is not described herein.
The above description of the embodiments is only for helping to understand the technical solution of the present application and its core ideas; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (10)
1. The utility model provides a backlight unit which characterized in that, backlight unit includes:
A first back plate;
The circuit board is positioned at one side of the first backboard along the first direction;
the light emitting unit and the light guide plate are positioned on one side of the circuit board away from the first backboard, and the light emitting unit is positioned on the side edge of the light guide plate along a second direction, and the second direction is perpendicular to the first direction;
The adhesive layer is positioned between the circuit board and the light guide plate;
And the supporting layer is positioned between the first backboard and the circuit board.
2. A backlight module according to claim 1, wherein the orthographic projection of the light emitting unit on the first back plate is located within the orthographic projection of the supporting layer on the first back plate.
3. A backlight module according to claim 1, further comprising:
the first reflector plate comprises a first body part, a first extension part and a first sinking part, wherein the first body part is positioned between the light guide plate and the first backboard, the first extension part is positioned between the circuit board and the first backboard, and the first sinking part is connected with the first body part and the first extension part;
The distance between the surface of the first extension part, which is close to one side of the light guide plate, and the light guide plate is larger than the distance between the surface of the first body part, which is close to one side of the light guide plate, and the light guide plate; the support layer includes the first extension.
4. A backlight module according to claim 3, wherein the first back plate comprises:
the second body part is positioned at one side of the first body part far away from the light guide plate;
The second extension part is positioned at one side of the first extension part far away from the circuit board;
a second sinking portion connecting the second body portion and the second extension portion;
The distance between the surface of the second extension part, which is close to one side of the light guide plate, and the light guide plate is greater than the distance between the surface of the second body part, which is close to one side of the light guide plate, and the light guide plate.
5. A backlight module according to claim 4, wherein a distance between a surface of the second extension portion on a side close to the light guide plate and a surface of the second body portion on a side close to the light guide plate is equal to a distance between a surface of the first extension portion on a side close to the light guide plate and a surface of the first body portion on a side close to the light guide plate.
6. A backlight module according to claim 3, wherein a distance between a surface of the first extension portion adjacent to the light guide plate and a surface of the first body portion adjacent to the light guide plate is smaller than a dimension of the support layer along the first direction.
7. A backlight module according to claim 1, further comprising:
the second backboard is positioned at one side of the light guide plate and the light emitting unit away from the first backboard;
a third back plate connected to edges of the first back plate and the second back plate and disposed along the first direction;
the light emitting unit, the light guide plate, the circuit board, the adhesive layer and the supporting layer are contained in a space surrounded by the first backboard, the second backboard and the third backboard.
8. A backlight module according to claim 7, further comprising:
the second reflecting sheet is positioned on one side of the second backboard, which is close to the first backboard;
the distance between the light emitting unit and the second reflecting sheet is smaller than a preset distance.
9. The backlight module according to claim 7, wherein the light emitting units are arranged at intervals along a third direction on the side edge of the light guide plate, and the third direction is perpendicular to the first direction and the second direction; and the orthographic projection of the adhesive layer on the third backboard is positioned between the orthographic projections of the adjacent two light-emitting units on the third backboard.
10. A display device, characterized in that the display device comprises a backlight module according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410141773.5A CN117991547A (en) | 2024-01-31 | 2024-01-31 | Backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410141773.5A CN117991547A (en) | 2024-01-31 | 2024-01-31 | Backlight module and display device |
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| Publication Number | Publication Date |
|---|---|
| CN117991547A true CN117991547A (en) | 2024-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202410141773.5A Pending CN117991547A (en) | 2024-01-31 | 2024-01-31 | Backlight module and display device |
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| CN (1) | CN117991547A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118151436A (en) * | 2024-05-10 | 2024-06-07 | 惠科股份有限公司 | Backlight module and display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118151436A (en) * | 2024-05-10 | 2024-06-07 | 惠科股份有限公司 | Backlight module and display device |
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