CN106195759A - Light emitting module and display device - Google Patents

Abstract

The invention provides a light-emitting module and a display device. A light-emitting module includes a light-emitting element and a light guide plate. The light-emitting element includes a light-emitting surface. The light-emitting surface includes a middle light-emitting area and an edge light-emitting area, and the edge light-emitting areas are arranged on opposite sides of the middle light-emitting area. The light-emitting element emits light beam from the light-emitting surface. The light guide plate includes a light incident surface adjacent to the middle light-emitting area. The width of the light incident surface in one direction is smaller than the width of the light emitting surface in one direction, and the light incident surface is used to receive part of the light beam emitted from the middle light emitting area, while the other part of the light beam emitted from the edge light emitting area deviates from the light incident surface. A display device is also proposed. The light beam provided by the present invention has uniform color and brightness, and can provide a good display screen.

Description

Light emitting module and display device

technical field

The invention relates to a light source device and an electronic device, and in particular to a light emitting module and a display device.

Background technique

The main function of the light source module is to provide the light source for the display device. The basic principle is to convert the adopted line light source or point light source into a surface light source with high brightness and good uniformity through the light guide plate. Generally speaking, the light source module can be divided into front light module (Front Light) and back light module (Back Light). The front light module is mainly used for reflective display devices, such as electrophoretic display (Electrophoretic Display, referred to as: EPD) panel, Or reflective display media.

In the existing front light module, a light emitting diode (Light Emitting Diode, LED for short) has been widely used in the above-mentioned line light source or point light source. Due to the high directivity of the light beam emitted by the light-emitting diode, and the existing white light-emitting diode is often formed by combining a blue light-emitting diode with a yellow phosphor powder, wherein the blue light emitted by the blue light-emitting diode excites the yellow phosphor powder. It emits yellow light, and then presents white light through the combination of the above-mentioned blue light and yellow light. Therefore, in the case of high directivity and the need for phosphors to convert, the best light can often be received directly above the light-emitting surface of the white light-emitting diode, and the color temperature of the light at the edge of the light-emitting surface will be lower, thereby making the light entering The light beam of the light guide plate is not uniform, which reduces the overall quality of the front light module.

Contents of the invention

The invention provides a light-emitting module, the light beam provided by it has uniform color and brightness.

The invention provides a display device, which can provide good display images.

The light emitting module of the present invention includes at least one light emitting element and a light guide plate. The light emitting element includes a light emitting surface. The light-emitting surface includes a middle light-emitting area and an edge light-emitting area, and the edge light-emitting area is arranged on opposite sides of the middle light-emitting area. The light emitting element emits light beams from the light emitting surface. The light guide plate includes a light incident surface adjacent to the middle light emitting area. The width of the light incident surface in one direction is smaller than the width of the light emitting surface in the above direction, and the light incident surface is used to receive part of the light beam emitted from the middle light emitting area, while another part of the light beam emitted from the edge light emitting area deviates from the light incident surface.

The display device of the present invention includes a display panel and the above-mentioned light emitting module. The display panel includes a display surface, and the light emitting module is arranged beside the display surface.

In an embodiment of the present invention, the above-mentioned light-emitting surface exceeds the light-incident surface in the above-mentioned direction.

In an embodiment of the present invention, the widths of the above-mentioned light-emitting surface and the light-incident surface in the above-mentioned direction conform to Where h is the width of the light emitting surface in the above direction, and t is the width of the light incident surface in the above direction.

In an embodiment of the present invention, there is a distance between the midpoint of the above-mentioned light-emitting surface in the above-mentioned direction and the midpoint of the light-incident surface in the above-mentioned direction, wherein the distance is less than or equal to (h-t)/2, h is the light-emitting surface The width in the above direction, t is the width of the light incident surface in the above direction.

In an embodiment of the present invention, the above-mentioned light-emitting module further includes a flexible circuit board electrically connected to the light-emitting element. The light guide plate also includes a first surface and a second surface, and the light incident surface is connected to the first surface and the second surface. The flexible circuit board is connected to part of the first surface through the adhesive layer.

In an embodiment of the present invention, the above-mentioned light-emitting module further includes a light-shielding layer. At least one light emitting element has an end adjacent to the second surface in a direction. The light-shielding layer bonds part of the second surface and the end of the light-emitting element through the adhesive layer, wherein part of the light guide plate is located between the light-shielding layer and the flexible circuit board.

In an embodiment of the present invention, the above light emitting module is a front light module.

Based on the above, in the light-emitting module provided by the embodiments of the present invention, the light guide plate receives the light beam emitted by the middle light-emitting area of the light-emitting element, so it can have relatively uniform color and brightness, and then make the light-emitting module a good light source. Because the display device provided by the embodiments of the present invention has the above-mentioned light-emitting module, it can use a good light source to provide a good picture.

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.

Description of drawings

Fig. 1A is a cross-sectional view of a light emitting module according to the first embodiment of the present invention;

Fig. 1B is a schematic diagram of a light-emitting element in the first embodiment of the present invention;

FIG. 2 is a schematic diagram of a display device of a second embodiment of the present invention.

Explanation of reference signs:

a: spacing;

d1: direction;

h, t, h1, h2: width;

L, L1, L2, L3, L4: light beams;

100, 200: light emitting module;

110, 210: light emitting elements;

112, 212: light-emitting surface;

112A: middle light-emitting area;

112B: edge light-emitting area;

114: blue light-emitting diode;

116: fluorescent structure;

120, 220: light guide plate;

122, 222: incident surface;

214: end;

221: first surface;

223: second surface;

230: flexible circuit board;

231, 241: sticky layer;

240: shading layer;

300: display panel;

301, 321: transparent adhesive layer;

310: display surface;

320: protective layer;

400: Display device.

detailed description

Fig. 1A is a cross-sectional view of a light emitting module according to the first embodiment of the present invention. Fig. 1B is a schematic diagram of a light emitting element in the first embodiment of the present invention. The contents shown in FIGS. 1A and 1B are only used to illustrate the relative relationship between the components, and some components are shown enlarged for clarity, which is not intended to limit the size and position of the components. Please refer to FIG. 1A and FIG. 1B , in the first embodiment of the present invention, the light emitting module 100 includes at least one light emitting element 110 and a light guide plate 120 . The light emitting element 110 includes a light emitting surface 112 . The light-emitting surface 112 includes a middle light-emitting area 112A and an edge light-emitting area 112B. The edge light-emitting area 112B is disposed on opposite sides of the middle light-emitting area 112A, and the middle light-emitting area 112A connects the two edge light-emitting areas 112B. The light emitting element 110 emits light beams L1 and L2 from the light emitting surface 112 . The light guide plate 120 includes a light incident surface 122 adjacent to the middle light emitting area 112A. The width t of the light incident surface 122 in the direction d1 is smaller than the width h of the light emitting surface 112 in the direction d1, and the light incident surface 122 is used to receive the light beam L1 emitted from the middle light emitting area 112A, and the light beam L2 emitted from the edge light emitting area 112B. Deviate from the light incident surface 122 .

That is to say, the light incident surface 122 of the light guide plate 120 of this embodiment receives the light beam L1 emitted from the middle light emitting area 112A among the light beams L emitted by the light emitting element 110, but does not receive the light beam L2 emitted from the edge light emitting area 112B, therefore The light beam L1 that can enter the light guide plate 120 has high uniformity in brightness and color. More specifically, in this embodiment, the light-emitting element 110 is, for example, a white light-emitting diode. Because the light beam L emitted by the light-emitting diode has high directivity, the quality of the light beam L1 emitted by the middle light-emitting area 112A is comparable to that of the edge light-emitting area 112B. The emitted light beam L2 will be different, so by allowing the light guide plate 120 to receive the light beam L1, the light emitting module 100 can be made into a good light source.

In detail, in this embodiment, the light emitting module 100 is, for example, a front light module, and the light emitting element 110 is, for example, emitting white light, and the light emitting element 110 further includes a blue light emitting diode 114 and a fluorescent structure 116 . The fluorescent structure 116 is configured with yellow phosphor, and the blue LED 114 is used to emit blue light. Part of the blue light penetrates the fluorescent structure 116 , and part of it is absorbed by the yellow phosphor powder in the fluorescent structure 116 to excite yellow light, and the yellow light and the blue light passing through the fluorescent structure 116 synthesize white light. Therefore, due to the directivity of the light beams emitted by the LEDs, the color temperature of the light beam L2 emitted from the edge light emitting area 112B is lower than the color temperature of the light beam L1 emitted from the middle light emitting area 112A. Therefore, the light guide plate 120 of this embodiment can be used as a good light source because it receives the light beam L1 with a high color temperature.

It should be noted that, in the embodiment of the present invention, the above-mentioned light-emitting element 110 is, for example, a light-emitting diode, but the present invention is not limited thereto. In other embodiments, the light emitting element may also be an organic light emitting diode (Organic Light Emitting Diode, OLED for short) or a laser diode (LD for short), or other light emitting elements suitable for emitting light. On the other hand, the above-mentioned light-emitting element 110 is, for example, a line light source, that is, a light-emitting strip composed of light-emitting diodes, but the present invention is not limited thereto. In other embodiments, the light emitting element may also be a plurality of light emitting diodes arranged in an array or a plurality of point light sources.

1A and 1B, in the first embodiment of the present invention, the above-mentioned light emitting surface 112 exceeds the light incident surface 122 in the direction d1, and the light beam L2 emitted from the edge light emitting area 112B will deviate from the light incident surface 122, so The light incident surface 122 will not receive the light beam L2. The above-mentioned widths of the light emitting surface 112 and the light incident surface 122 in the direction d1 are preferably in accordance with Where h is the width of the light emitting surface 112 in the direction d1, and t is the width of the light incident surface 122 in the direction d1. Since the light-emitting element 110 and the light guide plate 120 of the light-emitting module 100 of this embodiment have the above-mentioned arrangement relationship, the light guide plate 120 can receive a uniform light beam L1.

In other words, in this embodiment, the middle light emitting region 112A of the light emitting element 110 has a width h1 in the direction d1, and the light incident surface 122 of the light guide plate 120 has a width t less than or equal to the width h1 and faces part of the middle light emitting region 112A. . That is to say, the light guide plate 120 of this embodiment receives the light beam L1 with a uniform color temperature provided by the middle light-emitting area 112A near the middle of the light-emitting surface 112 through the light-incident surface 122, and the middle light-emitting area 112A and the light-emitting surface 112 conform to the above-mentioned Therefore, the light emitting module 100 of this embodiment can be used as a good light source.

Other embodiments are listed below for illustration. It must be noted here that the following embodiments use the component numbers and part of the content of the previous embodiments, wherein the same numbers are used to denote the same or similar components, and descriptions of the same technical content are omitted. For the description of omitted parts, reference may be made to the foregoing embodiments, and the following embodiments will not be repeated.

FIG. 2 is a schematic diagram of a display device of a second embodiment of the present invention. Please refer to FIG. 2 , in the second embodiment of the present invention, a display device 400 includes a display panel 300 and a light emitting module 200 . The display panel 300 includes a display surface 310 , and the light emitting module 200 is disposed beside the display surface 310 . The light emitting module 200 of this embodiment is similar to the above light emitting module 100 , except that the light emitting module 200 further includes a flexible printed circuit (FPC for short) 230 and a light shielding layer 240 .

In this embodiment, the flexible circuit board 230 is electrically connected to the light emitting element 210 , and the light emitting element 210 includes a light emitting surface 212 . The light guide plate 220 further includes a first surface 221 and a second surface 223 , and the light incident surface 222 connects the first surface 221 and the second surface 223 . The flexible circuit board 230 is connected to part of the first surface 221 through the adhesive layer 231 .

The light emitting element 210 has an end portion 214 adjacent to the second surface 223 in the direction d1. The light-shielding layer 240 adheres part of the second surface 223 and the end portion 214 of the light-emitting element 210 through another adhesive layer 241 , wherein part of the light guide plate 220 is located between the light-shielding layer 240 and the flexible circuit board 230 . In this embodiment, the light-shielding layer 240 is, for example, a kind of light-shielding tape, which is used to absorb extra unwanted light beams. In a preferred embodiment of the present invention, the light absorption ratio of the above-mentioned light-shielding tape is, for example, 5% to 100%. That is to say, in this embodiment, through the adhesive layers 231, 241, the flexible circuit board 230 and the light-shielding layer 240, the light-emitting element 210 can be arranged in an appropriate position so that the light beam L3 from its middle light-emitting area in the light-emitting surface 212 can be Enter the light guide plate 220 . Referring to FIG. 2 , in this embodiment, the first surface 221 of the light guide plate 220 is connected to the display panel 300 through the transparent adhesive layer 301 , and the second surface 223 is connected to the protective layer 320 through the transparent adhesive layer 321 . In addition, there may also be microstructures on the first surface 221 or the second surface 223, and the microstructures can reflect or refract the light beam entering the light guide plate 220 to the display panel 300, but the connection method between the light guide plate and the display panel of the present invention It is not limited to this. In other embodiments of the present invention, depending on the actual application, other functional components such as a touch panel can also be added above and below the light guide plate, wherein the light guide plate and other functional components can be connected through a transparent adhesive layer or an air layer. .

In detail, there is a distance a between the midpoint of the light-emitting surface 212 in the direction d1 and the midpoint of the light-incident surface 222 in the direction d1, wherein the distance a is less than or equal to (h2-t)/2, and h2 is the light-emitting surface 212 The width in the direction d1, t is the width of the light incident surface in the above direction d1. That is to say, in order to cooperate with the structural configuration of the overall display 400, the light-emitting module 200 in the embodiment of the present invention can adjust its position in the direction d1 relative to the light-emitting element 210 through the thinner light guide plate 220, and is not limited to Align to the center.

On the other hand, the light shielding layer 240 can absorb unnecessary light beams so that the unnecessary light beams will not enter the light guide plate 220 . Therefore, the light-emitting module 200 of this embodiment can provide the light beam L3 from the light-emitting element 210 and transmit it to the display surface 310 of the display panel 300 through the light guide plate 220, and then reflect it into an image light beam L4 through the display surface 310 for the user to watch, so that Users can get a good picture. In this embodiment, the display panel 300 is, for example, a Liquid Crystal Display (LCD for short) panel, but the present invention is not limited thereto. In other embodiments, the display panel may also be an electrophoretic display panel or other reflective display panels.

It should be noted that, in the above-mentioned embodiments, the light-emitting elements of the light-emitting module are disposed on the same side of the light guide plate, for example, but the present invention is not limited thereto. In other embodiments, light emitting elements can also be arranged on different sides of the light guide plate depending on the size, shape and brightness requirements of the light guide plate.

In summary, in the light-emitting module provided by the embodiments of the present invention, the light incident surface of the light guide plate is set corresponding to the middle light-emitting area of the light-emitting element, so the light beam emitted by the middle light-emitting area of the light-emitting element enters the light guide plate The light beams have similar color and brightness, so the light beam provided by the light emitting module as a light source also has a relatively uniform color and brightness, so the light emitting module can be a good light source. Because the display device provided by the embodiments of the present invention has the above-mentioned light-emitting module, it can use a good light source to illuminate the display surface of the display panel, thereby providing a good picture.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (13)

1. A light-emitting module, characterized in that, comprising: At least one light-emitting element, including a light-emitting surface, the light-emitting surface includes a middle light-emitting area and an edge light-emitting area, the edge light-emitting area is arranged on opposite sides of the middle light-emitting area, and the light-emitting element emits a light beam from the light-emitting surface ;as well as The light guide plate includes a light incident surface, the light incident surface is adjacent to the middle light-emitting area, the width of the light incident surface in one direction is smaller than the width of the light emitting surface in the direction, and the light incident surface is used for A part of the light beam emitted from the middle light-emitting area is received, and another part of the light beam emitted by the two edge light-emitting areas deviates from the light-incident surface. 2. The light emitting module according to claim 1, wherein the light emitting surface exceeds the light incident surface in the direction. 3. The light-emitting module according to claim 1, wherein the widths of the light-emitting surface and the light-incident surface in the direction conform to Where h is the width of the light-emitting surface in the direction, and t is the width of the light-incident surface in the direction. 4. The light-emitting module according to claim 1, wherein there is a distance between the midpoint of the light-emitting surface in the direction and the midpoint of the light-incident surface in the direction, wherein the The spacing is less than or equal to (h-t)/2, h is the width of the light-emitting surface in the direction, and t is the width of the light-incident surface in the direction. 5. The light emitting module according to claim 1, further comprising a flexible circuit board electrically connected to the light emitting element, and the light guide plate further comprises a first surface and a second surface, and the light incident surface The first surface and the second surface are connected, and the flexible circuit board is connected to a part of the first surface through an adhesive layer. 6. The light-emitting module according to claim 5, further comprising a light-shielding layer, the light-emitting element has an end adjacent to the second surface in the direction, and the light-shielding layer passes through another adhesive layer Adhesive part of the second surface and the end of the light emitting element, wherein part of the light guide plate is located between the light shielding layer and the flexible circuit board. 7. The light emitting module according to claim 1, wherein the light emitting module is a front light module. 8. A display device, characterized in that it comprises: a display panel, including a display surface; and A light-emitting module is arranged beside the display surface, and the light-emitting module includes: At least one light-emitting element includes a light-emitting surface, the light-emitting surface includes a middle light-emitting area and an edge light-emitting area, the two edge light-emitting areas are arranged on opposite sides of the middle light-emitting area, and the light-emitting element emits light from the light-emitting surface light beams; and The light guide plate includes a light incident surface, the light incident surface is adjacent to the middle light-emitting area, the width of the light incident surface in one direction is smaller than the width of the light emitting surface in the direction, and the light incident surface is used for A part of the light beam emitted from the middle light-emitting area is received, and another part of the light beam emitted by the two edge light-emitting areas deviates from the light-incident surface. 9. The display device according to claim 8, wherein the light emitting surface exceeds the light incident surface in the direction. 10. The display device according to claim 8, wherein the widths of the light-emitting surface and the light-incident surface in the direction meet: Where h is the width of the light-emitting surface in the direction, and t is the width of the light-incident surface in the direction. 11. The display device according to claim 8, wherein there is a distance between the midpoint of the light-emitting surface in the direction and the midpoint of the light-incident surface in the direction, wherein the The spacing is less than or equal to (h-t)/2, h is the width of the light-emitting surface in the direction, and t is the width of the light-incident surface in the direction. 12. The display device according to claim 8, further comprising a flexible circuit board electrically connected to the light emitting element, and the light guide plate further comprising a first surface and a second surface, the input The optical surface is connected to the first surface and the second surface, and the flexible circuit board is connected to part of the first surface through an adhesive layer. 13. The display device according to claim 12, further comprising a light-shielding layer, the light-emitting element has an end adjacent to the second surface in the direction, and the light-shielding layer passes through another adhesive layer Adhesive part of the second surface and the end of the light emitting element, wherein part of the light guide plate is located between the light shielding layer and the flexible circuit board.