CN211826833U - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN211826833U CN211826833U CN202020620365.5U CN202020620365U CN211826833U CN 211826833 U CN211826833 U CN 211826833U CN 202020620365 U CN202020620365 U CN 202020620365U CN 211826833 U CN211826833 U CN 211826833U
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- light
- guide plate
- light guide
- circuit board
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Abstract
The utility model relates to a backlight module and display device. The backlight module comprises a fixed frame, a light guide plate, a printed circuit board, a light source unit and a reflector, wherein the fixed frame comprises a first side and a second side, the light guide plate comprises a fixed side and a light incident side, the fixed side is fixedly arranged on the first side of the fixed frame, the light incident side is adjacent to the second side, the printed circuit board is fixedly arranged at the position, adjacent to the light incident side, of the light guide plate and is used for driving the light source unit to emit light, the light emitted by the light source unit enters the light guide plate through the light incident side of the light guide plate and emits light from a light emergent surface of the light guide plate, the reflector is fixedly arranged at the position, adjacent to the light incident side, of the printed circuit board, the reflector extends towards the fixed side along the light incident side of the light guide plate, and the reflector is separated from the fixed frame.
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 with high reliability and good optical quality.
Background
Liquid crystal display panels (liquid crystal display panels) are widely used in daily life, and the current market is developing towards the direction of thinning the liquid crystal display panels, in the process of thinning the liquid crystal display panels, the degree of mutual influence of elements included in a backlight module and a display device is relatively increased, so that the problems of reliability and light emitting surface quality are caused, for example, the problems of light leakage caused by displacement of a reflector, a printed circuit board and an optical film, or poor optical quality before and after long-term use or challenge test and the like are caused due to expansion or reduction of the volume of the liquid crystal display panels when the liquid crystal display panels are subjected to large temperature change, so how to improve the reliability and the light emitting surface quality of the backlight module is an item which needs to be continuously improved.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to provide a backlight module and a display device with high reliability and good optical quality, so as to solve the problems of the prior art.
One embodiment of the present invention provides a backlight module, which comprises a fixing frame, a light guide plate, a printed circuit board, a light source unit and a reflector, the fixing frame comprises a first side and a second side, the light guide plate comprises a fixing side and a light incident side, the fixing side is fixedly arranged on the first side of the fixing frame, and the light incident side is adjacent to the second side, the printed circuit board is fixedly arranged at the position of the light guide plate, which is adjacent to the light incident side, the light source unit is electrically connected with the printed circuit board, the printed circuit board is used for driving the light source unit to emit light, wherein the light emitted from the light source unit enters the light guide plate through the light incident side of the light guide plate and exits from the light exiting side of the light guide plate, the reflecting piece is fixedly arranged on the position, adjacent to the light incident side, of the printed circuit board, extends towards the fixed side along the light incident side of the light guide plate, and is separated from the fixed frame.
Another embodiment of the present invention provides a backlight module, which comprises a fixing frame, a light guide plate, a printed circuit board, a light source unit and a reflector, the fixing frame comprises a first side and a second side, the light guide plate comprises a fixing side and a light incident side, the fixing side is fixedly arranged on the first side of the fixing frame, and the light incident side is adjacent to the second side, the printed circuit board is fixedly arranged at the position of the light guide plate, which is adjacent to the light incident side, the light source unit is electrically connected with the printed circuit board, the printed circuit board is used for driving the light source unit to emit light, wherein the light emitted from the light source unit enters the light guide plate through the light incident side of the light guide plate and exits from the light exiting side of the light guide plate, the reflecting piece is fixedly arranged at the position, close to the light incident side, of the light guide plate, extends towards the fixed side along the light incident side of the light guide plate, and is separated from the fixed frame.
Another embodiment of the present invention provides a display device, which includes a liquid crystal panel and the backlight module, wherein the backlight module is disposed below the liquid crystal panel and provides light to the liquid crystal panel.
Compared with the prior art, the backlight module and the display device of the present invention can be fixed on the first side of the fixing frame by the fixing side of the light guide plate, so that other components disposed on the light incident side of the light guide plate are not fixed to the fixing frame, and therefore when the volume of the light guide plate changes (for example, expands with heat and contracts with cold), the light incident side of the light guide plate and the elements disposed thereon can be displaced synchronously with respect to the fixed frame, wherein only the light incident side of the light guide plate is displaceable relative to the fixed frame, the fixed side is non-displaceable relative to the fixed frame, therefore, the utility model discloses an element that this light guide plate and set up in this income light side can not change its relative position because the volume of this light guide plate changes, according to this, the utility model discloses a backlight unit and display device can have higher reliability or light emitting area quality when experiencing various temperature variations. Moreover, the light incident side of the light guide plate is combined with the surrounding elements and is not fixedly arranged on the fixed frame, so that the assembly steps can be simplified, and the difficulty of assembling the backlight module element is reduced.
Drawings
Fig. 1 is a schematic view of a display device according to a first embodiment of the present invention.
Fig. 2 is a schematic sectional view of the structure taken along the sectional line a-a of fig. 1.
Fig. 3 is a cross-sectional view illustrating a detailed structure of a display device according to a first embodiment of the present invention.
Fig. 4 is a schematic structural cross-sectional view of a display device according to a second embodiment of the present invention.
Fig. 5 is a sectional view showing a detailed structure of a display device according to a second embodiment of the present invention.
Fig. 6 is a schematic cross-sectional view of a display device according to a third embodiment of the present invention.
Detailed Description
The present invention can be understood by referring to the following detailed description and the accompanying drawings, wherein it is to be noted that, for the sake of brevity, only a portion of the backlight module and the display device is illustrated in the drawings, and at least some of the specific elements in the drawings are not illustrated in actual scale. In addition, the number and size of the elements in the drawings are merely illustrative and are not intended to limit the scope of the present invention.
When a corresponding element, such as a film or region, is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. On the other hand, when an element is referred to as being "directly on" another element, there is no element present therebetween. In addition, when a component is referred to as being "on" another component, the two components may be in a top-bottom relationship in a plan view, and the component may be above or below the other component, depending on the orientation of the device.
It will be understood that when an element or layer is referred to as being "connected to" another element or layer, it can be directly connected to the other element or layer or intervening elements or layers may be present. When an element is referred to as being "directly connected to" another element or layer, there are no intervening elements or layers present. In addition, when a component is referred to as being "coupled" to another component (or variations thereof), it may be directly connected to the other component, or indirectly connected (e.g., electrically connected) to the other component through one or more members. When a member or layer is referred to as being "fixedly disposed" or "secured" to another member or layer, the member or layer and the other member or layer are interconnected and cannot be displaced relative to one another.
It is to be understood that the following illustrative embodiments may be implemented by replacing, recombining, and mixing features of several different embodiments to accomplish other embodiments without departing from the spirit of or conflicting with the present invention.
Referring to fig. 1 and 2, fig. 1 is a schematic view of a display device according to a first embodiment of the present invention, and fig. 2 is a schematic structural cross-sectional view along a sectional line a-a of fig. 1. The display device 100 of the first embodiment of the present invention includes a backlight module 10 and a liquid crystal panel 30, wherein the backlight module 10 is disposed below the liquid crystal panel 30 and provides light to the liquid crystal panel 30. The backlight module 10 includes a fixing frame 12, a light guide plate 14, a Printed Circuit board 16, a light source unit 18 and a reflector 20, wherein the Printed Circuit board 16 may also be a Flexible Printed Circuit (Flexible Printed Circuit) and is adapted to the structure of the fixing frame 12 or the light guide plate 14. The fixing frame 12 includes a back plate 11 and a carrying portion 13, wherein the back plate 11 is used for carrying the light guide plate 14, the carrying portion 13 is used for placing the liquid crystal panel 30, the fixing frame 12 further includes a first side 12a and a second side 12b (e.g., a top side and a ground side) opposite to the first side 12a, the light guide plate 14 includes a fixing side 14a, a light incident side 14b opposite to the fixing side 14a, and a light emitting surface 14c connected between the fixing side 14a and the light incident side 14b, the fixing side 14a of the light guide plate 14 is disposed (e.g., fixedly disposed by a light guide plate adhesive tape 15) on the first side 12a of the fixing frame 12, and the light incident side 14b of the light guide plate 14 is located adjacent to the second side 12b, that is, only the fixing side 14a of the light guide plate 14 is fixedly disposed on the fixing frame 12, and the light incident side 14b of the light guide. The printed circuit board 16 is disposed (e.g., fixedly disposed) on the light incident side 14b of the light guide plate 14, the light source unit 18 is electrically connected to the printed circuit board 16, the printed circuit board 16 is configured to drive the light source unit 18 to emit light, wherein the light emitted by the light source unit 18 enters the light guide plate 14 through the light incident side 14b of the light guide plate 14 and exits from the light exiting surface 14c of the light guide plate 14, the reflector 20 is disposed (e.g., fixedly disposed) on the printed circuit board 16, and the reflector 20 extends toward the fixed side 14a along the light incident side 14b of the light guide plate 14 and covers the light exiting surface 14c of the light guide plate 14, in other words, the printed circuit board 16 and the reflector 20 are disposed adjacent to the light incident side 14b of the light exiting surface 14c of the light guide plate 14, and the.
Preferably, the reflection member 20 includes a fixing portion 21, and the reflection member 20 is fixed to the printed circuit board 16 adjacent to the light incident side 14b by the fixing portion 21, that is, the reflection member 20 is separated from the fixing frame 12. It should be noted that the components (such as the printed circuit board 16, the light source unit 18 and the reflector 20) around the light incident side 14b of the light guide plate 14 are not fixed to the fixing frame 12. Preferably, the backlight module 10 further includes an optical film 22 disposed on the light-emitting surface 14c of the light guide plate 14, wherein a portion of the optical film 22 adjacent to the light-incident side 14b covers the reflective element 20.
When the display device 100 of the present invention is heated at high temperature, the fixing side 14a of the light guide plate 14 is fixed on the fixing frame 12, so that the light incident side 14b of the light guide plate 14 is not fixed on the fixing frame 12, that is, the printed circuit board 16 and the reflector 20 are attached to the light incident side 14b of the light guide plate 14 but not fixed on the fixing frame 12. In other words, when the volume of the light guide plate 14 expands along the direction D due to heat, the light incident side 14b of the light guide plate 14 is displaced relative to the fixed frame 12 along the direction D, and it is noted that, instead of the displacement of the light guide plate 14 relative to the fixed frame 12, the end (i.e., the free end) of the light guide plate 14 that is not fixed due to the volume change is moved relative to the fixed frame 12, and the printed circuit board 16, the light source unit 18, and the reflector 20 may be displaced synchronously with the light incident side 14b of the light guide plate 14 relative to the fixed frame 12. On the other hand, when the display device 100 of the present invention is subjected to low temperature, i.e., the light guide plate 14 is cooled and the volume is reduced, the printed circuit board 16, the light source unit 18, the reflector 20 and the light incident side 14b of the light guide plate 14 are displaced in the direction opposite to the direction D.
Referring to fig. 3, fig. 3 is a detailed structural cross-sectional view of a display device according to a first embodiment of the present invention. As shown, the display device 100 of the present invention includes a backlight module 10 and a liquid crystal panel 30, wherein the liquid crystal panel 30 is disposed on a fixing frame 12 by an upper panel tape 302 and a lower panel tape 304. The printed circuit board 16 is fixed on the light emitting surface 14c of the light guide plate 14 by the circuit board adhesive tape 162 and is adjacent to the light incident side 14b, the reflector 20 is fixed on the printed circuit board 16 by the reflector adhesive tape 164, the fixed end 14a of the light guide plate 14 is fixed on the first side 12a of the fixing frame 12 by the light guide plate adhesive tape 15, a main reflector 32 is further disposed between the light guide plate 14 and the fixing frame 12, the main reflector 32 is fixed on the fixing frame 12 by the main reflector adhesive tape 34, and the main reflector 32 is used for reflecting the light in the light guide plate 14, so that the light in the light guide plate 14 can be emitted from the light emitting surface 14 c. It should be noted that a reflection distance RD is defined from the light source unit 18 to the edge of the reflector 20, and since the reflector 20 is fixed to the light guide plate 14, the reflection distance RD can be maintained when the volume of the light guide plate 14 changes, so as to further achieve the effect of reducing light leakage.
According to the above configuration, the first embodiment of the present invention utilizes the fixed side 14a of the light guide plate 14 to be fixedly disposed on the first side 12a of the fixed frame 12, and the incident side 14b of the light guide plate 14 and the surrounding elements are not fixedly disposed on the fixed frame 12 and can be displaced relatively, so as to ensure that the thermal expansion and contraction of the light guide plate 14 are spatially released in the fixed frame 12, so that the light guide plate 14 is not easy to deform, and thus, the display device of the present invention has higher reliability; on the other hand, when the display device 100 of the present invention experiences temperature and humidity changes, the relative positions of the printed circuit board 16, the light source unit 18, the reflector 20 and the light incident side 14b of the light guide plate 14 and/or the optical film 22 will not change, and only the relative positions between these elements and the fixed frame 12 will change, so that the problems of light leakage of the backlight module 10 and poor quality of the light emitting surface caused by light leakage can be further prevented. Therefore, the display device 100 of the present invention has a higher reliability and a better optical quality. Moreover, since the light incident side 14b of the light guide plate 14 and the surrounding elements do not need to be bonded to the fixing frame 12, the assembly steps can be simplified, and the difficulty in assembling the elements of the backlight module 10 can be reduced.
Referring to fig. 4, fig. 4 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention. As shown in fig. 4, a display device 200 according to a second embodiment of the present invention includes a backlight module 50 and a liquid crystal panel 30. Specifically, the main differences between the display device 200 of the second embodiment and the display device 100 of the first embodiment are: the reflective member 20 of the backlight module 50 is fixedly disposed adjacent to the light incident side 14b of the light guide plate 14, and the printed circuit board 16 and the reflective member 20 are respectively disposed on two opposite sides of the light guide plate 14 adjacent to the light incident side 14 b. It should be noted that the reflective element 20 is fixed on the light emitting surface 14c of the light guide plate 14, and the reflective element 20 is not fixed on the fixed frame 12, in other words, the reflective element 20 can move relative to the fixed frame 12. On the other hand, the printed circuit board 16 is disposed on the other surface of the light guide plate 14 opposite to the light exit surface 14c, so as to be capable of moving relatively along with the expansion and contraction of the light guide plate 14, thereby ensuring that the positions of the printed circuit board 16 and the light source unit 18 relative to the light entrance side 14c of the light guide plate 14 are not changed, and further ensuring that the display device 200 of the second embodiment of the present invention has higher reliability and better optical quality.
According to the above configuration, the printed circuit board 16, the light source unit 18, the reflector 20, and the light incident side 14b of the light guide plate 14 of the display device 200 of the second embodiment are not fixed to the fixing frame 12, so that the display device 200 of the present invention does not change the relative position between the elements of the light incident side 14b of the light guide plate 14 due to the temperature change, thereby preventing the light leakage of the backlight module 50 and the poor quality of the light emitting surface caused by the light leakage, and reducing the difficulty in assembling the elements of the backlight module 50.
Referring to fig. 5, fig. 5 is a detailed structural cross-sectional view of a display device according to a second embodiment of the present invention. The positions of the first side 12a of the fixed frame 12 and the surrounding elements are the same as those in fig. 3, and for the sake of simplicity, fig. 5 only shows the positions of the second side 12b of the fixed frame 12 and the surrounding elements, and the positions of the first side 12a of the fixed frame 12 and the surrounding elements are omitted. The display device 200 includes a backlight module 50 and a liquid crystal panel 30, the liquid crystal panel 30 is disposed on the fixing frame 12 by a lower panel tape 304, the printed circuit board 16 of the backlight module 50 is disposed between the light guide plate 14 and the fixing frame 12 and disposed on the second side 12b of the light guide plate 14 close to the fixing frame 12, and the reflector 20 is directly fixed on the light guide plate 14 and covers the light source unit 18. Similarly, a reflection distance RD is defined from the light source unit 18 to the edge of the reflector 20, and since the reflector 20 is fixed to the light guide plate 14, the reflection distance RD can be maintained when the volume of the light guide plate 14 changes, so as to further achieve the effect of reducing light leakage.
Referring to fig. 6, fig. 6 is a schematic cross-sectional view of a display device according to a third embodiment of the present invention. As shown in fig. 6, a display device 300 according to a third embodiment of the present invention includes a backlight module 60 and a liquid crystal panel 30. Specifically, the display device 300 of the third embodiment is similar to the display device 100 of the first embodiment in the component configuration, and the printed circuit board 16, the light source unit 18, and the reflector 20 are fixed to the light incident side 14b of the light guide plate 14, but not fixed to the fixing frame 12, and the main differences are that: the reflector 20 is disposed between the printed circuit board 16 and the light guide plate 14. Therefore, when the volume of the light guide plate 14 changes, the relative positions of the components of the printed circuit board 16, the light source unit 18 and the reflector 20 will not change due to the temperature change, thereby preventing the problems of light leakage of the backlight module 60 and poor quality of the light emitting surface caused by the light leakage.
Compared with the prior art, the backlight module and the display device of the present invention can be fixed on the first side of the fixing frame by the fixing side of the light guide plate, so that other components disposed on the light incident side of the light guide plate are not fixed to the fixing frame, and when the volume of the light guide plate changes (e.g. expands with heat and contracts with cold), the light incident side of the light guide plate and the element arranged at the light incident side can synchronously displace relative to the fixed frame, wherein only the light incident side of the light guide plate is displaceable relative to the fixed frame, the fixed side is non-displaceable relative to the fixed frame, therefore, the utility model discloses an element that this light guide plate and set up in this income light side can not change its relative position because the volume of this light guide plate changes, according to this, the utility model discloses a backlight unit and display device can have higher reliability or light emitting area quality when experiencing various temperature variations. Moreover, the light incident side of the light guide plate is combined with the surrounding elements and is not fixedly arranged on the fixed frame, so that the assembly steps can be simplified, and the difficulty of assembling the backlight module element is reduced.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.
[ List of reference numerals ]
100,200,300 display device
10,50,60 backlight module
11 backboard
12 fixed frame
12a first side
12b second side
13 bearing part
14 light guide plate
14a fixed side
14b incident light side
14c light emitting surface
15 light guide plate adhesive tape
16 printed circuit board
162 circuit board adhesive tape
164 Reflector tape
20 reflecting piece
22 optical film
24 prism sheet
25 lower diffusion membrane
Diffusion film on 26
30 liquid crystal panel
302 upper panel adhesive tape
304 lower panel tape
32 primary reflector
34 main reflector tape
Direction D
RD reflection distance.
Claims (12)
1. A backlight module, comprising:
a fixed frame including a first side and a second side;
the light guide plate comprises a fixed side and a light incident side, the fixed side is fixedly arranged on the first side of the fixed frame, and the light incident side is adjacent to the second side;
the printed circuit board is fixedly arranged at the position, adjacent to the light incident side, of the light guide plate;
the light source unit is electrically connected to the printed circuit board, and the printed circuit board is used for driving the light source unit to emit light, wherein the light emitted by the light source unit enters the light guide plate through the light inlet side of the light guide plate and emits light from the light outlet side of the light guide plate; and
the reflecting piece is fixedly arranged at the position, close to the light incident side, of the printed circuit board, extends towards the fixed side along the light incident side of the light guide plate, and is separated from the fixed frame.
2. A backlight module according to claim 1, wherein the reflector comprises:
the reflecting piece is fixedly arranged at the position, close to the light incident side, of the printed circuit board through the fixing part, and the reflecting piece is separated from the fixing frame.
3. The backlight module as claimed in claim 1, further comprising:
an optical film disposed on the light guide plate, wherein a portion of the optical film is disposed on the reflector.
4. The backlight module as claimed in claim 1, wherein the light exit surface is disposed between the fixing side and the light entrance side of the light guide plate, the printed circuit board and the reflector are disposed on the light exit surface of the light guide plate adjacent to the light entrance side, and the printed circuit board is disposed between the reflector and the light guide plate.
5. The backlight module as claimed in claim 1, wherein the light exit surface is disposed between the fixing side and the light entrance side of the light guide plate, the printed circuit board and the reflector are disposed on the light exit surface of the light guide plate adjacent to the light entrance side, and the reflector is disposed between the printed circuit board and the light guide plate.
6. The backlight module according to claim 1, wherein when the volume of the light guide plate changes, the fixing side of the light guide plate is fixed with respect to the fixing frame, and at least a portion of the light incident side of the light guide plate, the light source unit, the printed circuit board, and the reflector are synchronously displaced with respect to the first side of the fixing frame.
7. A backlight module, comprising:
a fixed frame having a first side and a second side;
the light guide plate comprises a fixed side and a light incident side, the fixed side is fixedly arranged on the first side of the fixed frame, and the light incident side is adjacent to the second side;
a printed circuit board located adjacent to the light incident side of the light guide plate;
the light source unit is electrically connected to the printed circuit board, and the printed circuit board is used for driving the light source unit to emit light, wherein the light emitted by the light source unit enters the light guide plate through the light inlet side of the light guide plate and emits light from the light outlet side of the light guide plate; and
the reflecting piece is fixedly arranged at the position, close to the light incident side, of the light guide plate, extends towards the fixed side along the light incident side of the light guide plate, and is separated from the fixed frame.
8. The backlight module according to claim 7, wherein the printed circuit board and the reflector are disposed on opposite sides of the light guide plate adjacent to the light incident side.
9. The backlight module according to claim 7 or 8, wherein the reflector comprises:
the reflecting piece is fixedly arranged on the light emitting surface of the light guide plate and close to the light incident side by the fixing part, and the reflecting piece is separated from the fixing frame.
10. The backlight module according to claim 7, further comprising:
an optical film disposed on the light guide plate, wherein a portion of the optical film is disposed on the reflector.
11. A display device, comprising:
a liquid crystal panel; and
a backlight module according to any one of claims 1 to 10;
wherein the backlight assembly is disposed under the liquid crystal panel and supplies light to the liquid crystal panel.
12. The display device according to claim 11, wherein the fixing frame comprises a back plate and a carrying portion for placing the liquid crystal panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020620365.5U CN211826833U (en) | 2020-04-22 | 2020-04-22 | Backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020620365.5U CN211826833U (en) | 2020-04-22 | 2020-04-22 | Backlight module and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211826833U true CN211826833U (en) | 2020-10-30 |
Family
ID=73143248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020620365.5U Active CN211826833U (en) | 2020-04-22 | 2020-04-22 | Backlight module and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211826833U (en) |
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2020
- 2020-04-22 CN CN202020620365.5U patent/CN211826833U/en active Active
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