CN104676360A - Backlight module and display device - Google Patents

Abstract

The present invention discloses a backlight module and a display device, wherein the backlight module includes a lampshade, a light strip, a light guide plate, a reflector and an optical film. The light strip is arranged in the lampshade. The light guide plate has a light input end, a far light end, a bottom surface and a light output surface. The light input end is arranged in the lampshade, and the light generated by the light strip enters the light guide plate through the light input end. The reflector is flexible and fixed to the lampshade to cover a portion of the light output surface. The reflector has a first plane portion and a second plane portion extending from the first plane portion, a first fold line is provided between the first plane portion and the second plane portion, the first plane portion is parallel to the bottom surface, and the second plane portion is inclined to the first plane portion and inclined toward a direction close to the bottom surface. The optical film overlaps the far light end of the light guide plate and a portion of the reflector.

Description

Backlight module and display device

technical field

The present invention relates to a backlight module, and in particular to a backlight module and a display device. the

Background technique

Current electronic devices usually use flat panel displays to display images, among which liquid crystal display technology is relatively sophisticated and popular. However, since the liquid crystal display panel/module of the liquid crystal display itself cannot emit light, a backlight module is provided under the liquid crystal display panel to provide light required for image display. The backlight module usually includes a lampshade, a light bar and a light guide plate, wherein the light bar is disposed in the lampshade, and the light incident end of the light guide plate is also disposed in the lampshade to receive the light generated by the light bar. the

At present, the public has higher and higher requirements for displays, especially when displaying pure black or pure white images, whether the images are uniform and whether there is any abnormal light leakage. Therefore, in order to avoid light scattering and light leakage, the known technology generally utilizes a lampshade to cover the light-incident end of the light bar and the light guide plate. However, the gap between the lampshade and the light guide plate is not easy to eliminate due to assembly tolerances, which causes light leakage. In order to eliminate the gap between the lampshade and the light guide plate, the lampshade should fit the light-emitting surface of the light guide plate as much as possible, but the metal integrally formed lampshade is easy to scratch the light guide plate when the light guide plate is assembled to the opening of the lamp shade, affecting the light guide plate. Light quality. If the opening of lampshade is enlarged, light leakage phenomenon will be caused again. China Taiwan Patent No. M331123 discloses a backlight module, which has the above defects. Another way is to use a plastic one-piece lampshade, and make the opening slightly smaller than the thickness of the light incident end of the light guide plate so that the lampshade can tightly fit the light guide plate after assembly. Although it can prevent light leakage and will not scratch the light guide plate, but Under the trend of thinning the light guide plate, the thickness of the light incident end of the light guide plate is only a few centimeters (mm), and the opening of the lampshade is smaller. Difficulty, on the contrary, it is easy to damage the lampshade body, resulting in light leakage, or damage the LED light source placed in the lampshade due to improper application of force. the

Contents of the invention

The invention provides a backlight module used as a plane light source. the

The invention provides a display device for outputting optical images. the

Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention. the

To achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides a backlight module. The backlight module includes a lampshade, a light strip, a light guide plate, a reflector and an optical film. The light strip is arranged in the lampshade. The light guide plate has a light incident end, a far light end, a bottom surface and a light exit surface. The light incident end is arranged in the lampshade, and the light generated by the light strip enters the light guide plate through the light incident end. The reflective sheet is flexible and fixed to the lampshade to cover part of the light-emitting surface. The reflective sheet has a first planar portion and a second planar portion extending from the first planar portion, there is a first fold line between the first planar portion and the second planar portion, the first planar portion is parallel to the bottom surface, and the second The planar portion is inclined to the first planar portion and is inclined toward a direction close to the bottom surface. The optical film overlaps the far light end of the light guide plate and part of the reflective sheet. the

In the backlight module according to another embodiment of the present invention, the lampshade has a fixing part, and the first planar part is fixed to the fixing part of the lampshade. the

The backlight module according to another embodiment of the present invention further includes an adhesive layer located between the fixing part and the first planar part, so that the first planar part is attached to the fixing part through the adhesive layer. the

In the backlight module according to another embodiment of the present invention, the thickness of the light incident end of the light guide plate is tapered from the light incident end to the far light end. the

In the backlight module according to another embodiment of the present invention, the orthographic projection of the first folding line on the light guide plate is located at the light incident end. the

In the backlight module according to another embodiment of the present invention, there is a first angle between the first plane portion and the second plane portion, and the range of the first angle is 110 degrees to 170 degrees. the

In the backlight module according to another embodiment of the present invention, the optical film overlaps part of the second plane portion. the

In the backlight module according to another embodiment of the present invention, the reflective sheet further has a third planar portion extending from the second planar portion, a second folding line is formed between the second planar portion and the third planar portion, and the third planar portion The optical film overlaps part of the third plane part and is inclined to the second plane part and is inclined towards a direction away from the bottom surface. the

In the backlight module according to another embodiment of the present invention, there is a second included angle between the second planar portion and the third planar portion, and the angle range of the second included angle is 110° to 170°. the

In the backlight module of another embodiment of the present invention, the lampshade is made of metal and the reflector is made of plastic. the

In the backlight module according to another embodiment of the present invention, the reflective sheet covers a light mixing area corresponding to the light strip on the light guide plate. the

Another embodiment of the invention provides a display device. The display device includes a backlight module and a display module. The backlight module includes a lampshade, a light strip, a light guide plate, a reflector and an optical film. The light strip is arranged in the lampshade. The light guide plate has a light incident end, a far light end, a bottom surface and a light exit surface. The light incident end is arranged in the lampshade, and the light generated by the light strip enters the light guide plate through the light incident end. The reflective sheet is flexible and fixed to the lampshade to cover part of the light-emitting surface. The reflective sheet has a first planar portion and a second planar portion extending from the first planar portion, there is a first fold line between the first planar portion and the second planar portion, the first planar portion is parallel to the bottom surface, and the second The planar portion is inclined to the first planar portion and is inclined toward a direction close to the bottom surface. The optical film overlaps the far light end of the light guide plate and part of the reflective sheet. The display module is superimposed on the lampshade and the optical film. the

In the display device according to another embodiment of the present invention, the lampshade has a fixing part, the first plane part is fixed to the fixing part of the lampshade, and the fixing part is used for carrying the display module. the

In the display device according to another embodiment of the present invention, the backlight module further includes an adhesive layer located between the fixing portion and the first planar portion, so that the first planar portion is attached to the fixing portion through the adhesive layer. the

In the display device according to another embodiment of the present invention, the thickness of the light incident end of the light guide plate is tapered from the light incident end to the far light end. the

In the display device according to another embodiment of the present invention, the orthographic projection of the first fold line on the light guide plate is located at the light incident end. the

In the display device according to another embodiment of the present invention, there is a first angle between the first plane part and the second plane part, and the range of the first angle is 110 degrees to 170 degrees. the

In the display device according to another embodiment of the present invention, the optical film overlaps part of the second planar portion. the

In the display device according to another embodiment of the present invention, the reflective sheet further has a third planar portion extending from the second planar portion, a second folding line is formed between the second planar portion and the third planar portion, and the third planar portion The optical film overlaps part of the third plane part and is inclined to the second plane part and is inclined towards a direction away from the bottom surface. the

In the display device according to another embodiment of the present invention, there is a second included angle between the second planar portion and the third planar portion, and the angle range of the second included angle is 110 degrees to 170 degrees. the

In the display device according to another embodiment of the present invention, the reflective sheet covers a light mixing area corresponding to the light bar on the light guide plate. the

In the display device according to another embodiment of the present invention, the reflective sheet extends to a boundary of a viewing area of the display module. the

Based on the above, the above embodiments of the present invention can achieve at least one of the following advantages or effects. In the above-mentioned embodiments of the present invention, the reflective sheet is easy to assemble and has flexibility so as not to scratch the light guide plate, and is easy to be flatly attached to the light guide plate to prevent light leakage and protect the light guide plate at the same time. In addition, the reflection sheet can raise the part of the optical film close to the light bar away from the light guide plate, so as to slow down the deformation of the optical film due to heat. the

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings. the

Description of drawings

FIG. 1 is a schematic diagram of a backlight module without an optical film installed in an embodiment of the present invention. the

FIG. 2 is a schematic diagram of the backlight module and the display module of FIG. 1 . the

FIG. 3 is a schematic diagram of a backlight module without an optical film installed in another embodiment of the present invention. the

FIG. 4 is a schematic diagram of the backlight module and the display module of FIG. 3 . the

FIG. 5 is a schematic diagram of a backlight module and a display module according to another embodiment of the present invention. the

Detailed ways

The aforementioned and other technical content, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only referring to the directions of the drawings. Accordingly, the directional terms are used to illustrate and not to limit the invention. the

Please refer to FIG. 1 and FIG. 2 , the present embodiment discloses a backlight module 100 and a display module 200 overlapped on the backlight module 100 , wherein the display module 200 overlaps on the backlight module 100 . The display module 200 is, for example, a liquid crystal display module, and the backlight module 100 provides the planar light source required by the display module 200 . The backlight module 100 and the display module 200 constitute a display device 50 which may also include other components. In this embodiment, the backlight module 100 includes a lampshade 110 , a light bar 120 , a light guide plate 130 , a reflector 140 and a plurality of optical films 150 (as shown in FIG. 2 ). the

The material of the lampshade 110 may include metal. The light bar 120 is disposed in the lampshade 110 . In this embodiment, the light bar 120 includes a circuit board 122 and a plurality of light emitting elements (such as light emitting diodes) 124 mounted on the circuit board 122 . The light guide plate 130 has a light incident end 130a, a far light end 130b, a bottom surface 130c and a light exit surface 130d. The light incident end 130 a is disposed in the lampshade 110 , and the light generated by the light bar 120 enters the light guide plate 130 through the light incident end 130 a. The thickness of the light incident end 130 a of the light guide plate 130 is tapered from the light incident end 130 a to the far light end 130 b to fully receive the light generated by the light bar 120 . the

The material of the reflective sheet 140 may include plastic. The reflective sheet 140 is flexible and fixed to the lampshade 110 to cover part of the light-emitting surface 130d. In this embodiment, the reflective sheet 140 covers a light mixing area MA corresponding to the light bar 120 on the light guide plate 130 , and the reflective sheet 140 extends to the boundary of a visible area VA of the display module 200 . the

The reflective sheet 140 has a first planar portion 142 and a second planar portion 144 extending from the first planar portion 142. There is a first fold line 143 between the first planar portion 142 and the second planar portion 144, wherein the first fold line The orthographic projection of 143 on the light guide plate 130 may be located at the light incident end 130a. The first planar portion 142 is parallel to the bottom surface 130c, and the second planar portion 144 is inclined to the first planar portion 142 and is inclined towards the direction close to the bottom surface 130c, as shown in FIG. 1 . In this embodiment, there is a first included angle A1 between the first planar portion 142 and the second planar portion 144 , and the range of the first included angle A1 may be 110 degrees to 170 degrees. The lampshade 110 has a fixing portion 112 , and the first planar portion 142 is fixed to the fixing portion 112 of the lampshade 110 . The backlight module 100 further includes an adhesive layer 160 , and the adhesive layer 160 is located between the fixing portion 112 and the first planar portion 142 , so that the first planar portion 142 can be attached to the fixing portion 112 through the adhesive layer 160 . the

As shown in Figure 2, the optical film 150 overlaps the far light end 130b of the light guide plate 130 and part of the reflective sheet 140, so that the second plane part 144 of the reflective sheet 140 is slightly curved, and the optical film 150 overlaps part of the second plane Section 144. The fixing part 112 of the lampshade 110 is used for carrying the display module 200 , and the display module 200 is overlapped on the fixing part 112 of the lampshade 110 and the optical film 150 . In another embodiment of the present invention, the lampshade 110 is ㄈ-shaped and the fixing part 112 is parallel to the bottom surface 130c of the light guide plate 130, and the material of the lampshade 110 can be metal, so it has enough strength to carry the display module 200, and the reflective sheet The material of 140 can be plastic, so it can directly contact the light-emitting surface 130d of the light guide plate 130 without scratching the light guide plate 130 . the

In the embodiment shown in FIGS. 1 and 2 , the reflective sheet 140 has a first planar portion 142 and a second planar portion 144. However, compared with the embodiment shown in FIG. 1 and FIG. 2, in another embodiment shown in FIG. 3 and FIG. There is a third planar portion 146 , and there is a second folding line 145 between the second planar portion 144 and the third planar portion 146 . Likewise, the third planar portion 146 is inclined to the second planar portion 144 and is inclined away from the bottom surface 130c, and the optical film 150 overlaps part of the third planar portion 146, as shown in FIG. 4 . In this embodiment, there is a second included angle A2 between the second planar portion 144 and the third planar portion 146 , and the angle range of the second included angle A2 may also be 110 degrees to 170 degrees. the

In another embodiment shown in FIG. 5, compared with the embodiment shown in FIG. The light-emitting height H2 of the light-emitting element 124 is lower than the actual height H1 of the light-emitting element 124, so the light guide plate 130A takes into account the thinning of the backlight module and comprehensively receives the light generated by the light bar 120, and the height H3 of the light incident end 130a of the light guide plate 130A is low. Because of the actual height H1 of the light-emitting element 124, a flexible reflective sheet 140 is used and fixed to the lampshade 110 to cover part of the light-emitting surface 130d. The rest of the elements and functions are the same as those of the embodiment shown in FIG. 2 , so they will not be repeated here. the

To sum up, in the above-mentioned embodiments of the present invention, the reflective sheet is easy to assemble and is flexible so that it is not easy to scratch the light guide plate, and it is easy to be flattened on the light guide plate to prevent light leakage and protect the light guide plate at the same time. It can also be further matched The lampshade is made of metal, so that the lampshade has enough strength to carry the display module. In addition, the reflection sheet can raise the part of the optical film close to the light bar away from the light guide plate, so as to slow down the deformation of the optical film due to heat. the

The above is only a preferred embodiment of the present invention, and cannot limit the scope of the present invention. All simple equivalent changes and modifications made according to the claims of the present invention and the content of the invention still belong to the scope covered by the patent of the present invention. . In addition, any embodiment or claim of the present invention does not need to achieve all the objects or advantages or features disclosed in the present invention. In addition, the abstract and the title of the invention are only used to assist in the retrieval of patent documents, and are not used to limit the scope of rights of the present invention. the

【Symbol Description】

50: display device

100: backlight module

110: lampshade

112: fixed part

120: light bar

122: circuit board

124: Light emitting element

130, 130A: light guide plate

130a: light incident end

130b: far light end

130c: bottom surface

130d: light emitting surface

140: reflective sheet

142: First Plane Department

143: First folding line

144: Second plane part

145: Second folding line

146: Third plane part

150: optical film

160: Viscose layer

200: display module

A1: First angle

A2: Second angle

MA: Mixed light area

VA: Visual Area

H1, H2, H3: Height. the

Claims (22)

1. A backlight module, comprising a lampshade, a light strip, a light guide plate, a reflector and an optical film, The light strip is arranged in the lampshade, The light guide plate has a light incident end, a far light end, a bottom surface and a light exit surface, wherein the light incident end is arranged in the lampshade, and the light generated by the light strip passes through the light incident end into the light guide plate, The reflective sheet is flexible and fixed to the lampshade to cover part of the light-emitting surface, wherein the reflective sheet has a first plane portion and a second plane portion extending from the first plane portion, so There is a first fold line between the first planar part and the second planar part, the first planar part is parallel to the bottom surface, the second planar part is inclined to the first planar part and approaches the the direction of the bottom surface is inclined, and The optical film overlaps the far light end of the light guide plate and part of the reflective sheet. 2. The backlight module according to claim 1, wherein the lampshade has a fixing part, and the first planar part is fixed to the fixing part of the lampshade. 3. The backlight module according to claim 2, further comprising: An adhesive layer is located between the fixing part and the first planar part, so that the first planar part is attached to the fixing part through the adhesive layer. 4 . The backlight module according to claim 1 , wherein the thickness of the light-incident end of the light guide plate is tapered from the light-incident end to the far-light end. 5. The backlight module according to claim 4, wherein the orthographic projection of the first fold line on the light guide plate is located at the light incident end. 6. The backlight module according to claim 1, wherein there is a first angle between the first plane part and the second plane part, and the range of the first angle is 110 degrees to 170 degrees. 7. The backlight module according to claim 1, wherein the optical film overlaps part of the second plane portion. 8. The backlight module according to claim 1, wherein the reflector further has a third planar portion extending from the second planar portion, the second planar portion and the third planar portion There is a second folding line therebetween, the third plane portion is inclined to the second plane portion and is inclined toward a direction away from the bottom surface, and the optical film overlaps part of the third plane portion. 9. The backlight module according to claim 8, wherein there is a second included angle between the second planar portion and the third planar portion, and the angle range of the second included angle is 110° degrees to 170 degrees. 10 . The backlight module according to claim 1 , wherein the lampshade is made of metal and the reflector is made of plastic. 11 . 11. The backlight module according to claim 1, wherein the reflective sheet covers a light mixing area corresponding to the light strip in the light guide plate. 12. A display device comprising a backlight module and a display module, The backlight module includes a lampshade, a light bar, a light guide plate, a reflector and an optical film, The light strip is arranged in the lampshade, The light guide plate has a light incident end, a far light end, a bottom surface and a light exit surface, wherein the light incident end is arranged in the lampshade, and the light generated by the light strip passes through the light incident end into the light guide plate, The reflective sheet is flexible and fixed to the lampshade to cover part of the light-emitting surface, wherein the reflective sheet has a first plane portion and a second plane portion extending from the first plane portion, so There is a first fold line between the first planar part and the second planar part, the first planar part is parallel to the bottom surface, the second planar part is inclined to the first planar part and approaches the the direction of the bottom surface is inclined, and The optical film overlaps the far light end of the light guide plate and part of the reflective sheet, The display module is overlapped on the lampshade and the optical film. 13. The display device according to claim 12, wherein the lampshade has a fixing part, the first planar part is fixed to the fixing part of the lampshade, and the fixing part is used to carry the display module. 14. The display device according to claim 13, wherein the backlight module further comprises: An adhesive layer is located between the fixing part and the first planar part, so that the first planar part is attached to the fixing part through the adhesive layer. 15 . The display device according to claim 12 , wherein the thickness of the light-incident end of the light guide plate is tapered from the light-incident end to the far-light end. 16. The display device according to claim 15, wherein the orthographic projection of the first fold line on the light guide plate is located at the light incident end. 17. The display device according to claim 12, wherein there is a first included angle between the first planar portion and the second planar portion, and the angle range of the first included angle is 110° degrees to 170 degrees. 18. The display device according to claim 12, wherein the optical film overlaps part of the second planar portion. 19. The display device according to claim 12, wherein the reflective sheet further has a third planar portion extending from the second planar portion, the second planar portion and the third planar portion There is a second folding line therebetween, the third planar portion is inclined to the second planar portion and is inclined in a direction away from the bottom surface, and the optical film overlaps part of the third planar portion. 20. The display device according to claim 19, wherein there is a second included angle between the second planar portion and the third planar portion, and the angle range of the second included angle is 110° degrees to 170 degrees. 21 . The display device according to claim 12 , wherein the reflective sheet covers a light mixing area corresponding to the light bar in the light guide plate. 22. The display device according to claim 12, wherein the reflective sheet extends to a boundary of a viewable area of the display module.