TWI580893B - Light emitting module and display device - Google Patents

Description

Light-emitting module and display device

The present invention relates to a light source device and an electronic device, and more particularly to a light emitting module and a display device.

The function of the light source module is mainly to provide the light source of the display device. The basic principle is to use the line light source or the point light source to convert the effective light into a high-brightness and uniform surface light source through the light guide plate. In general, the light source module can be divided into two types: Front Light and Back Light. The front light module is mainly used for reflective display devices, such as Electrophoretic Display (EPD). ) Panel, or reflective display media.

In the existing front light module, a light emitting diode (LED) has been commonly used as the above-mentioned line light source or point light source. Since the directivity of the light beam emitted by the light-emitting diode is high, the existing white light-emitting diode is often formed by a blue light-emitting diode with a yellow fluorescent powder, wherein the blue light-emitting diode emits The blue light excites the yellow phosphor to emit yellow light, and then the white light is presented by the combination of the blue light and the yellow light. Therefore, in the high directivity and need firefly In the case of light powder conversion, the light beam of the white light emitting diode can receive the best light directly above, and the color temperature of the edge light of the light emitting surface is lower, thereby making the light beam entering the light guiding plate uneven. Reduce the overall quality of the front light module.

The invention provides a lighting module that provides a light beam with uniform color and brightness.

The present invention provides a display device that can provide a good display screen.

The light emitting module of the present invention comprises 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 an intermediate light emitting area and two edge light emitting areas, and the edge light emitting areas are disposed on opposite sides of the middle light emitting area. The light emitting element emits a light beam from the light emitting surface. The light guide plate includes a light incident surface adjacent to the intermediate light emitting region. 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 for receiving a partial light beam emitted from the intermediate light emitting region, and another portion of the light beam emitted from the edge light emitting region is deflected into the light. surface.

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

In an embodiment of the invention, the light emitting surface exceeds the light incident surface in the direction.

In an embodiment of the invention, the width of the light emitting surface and the light incident surface in the above direction are consistent 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 invention, the light-emitting surface has a pitch between a midpoint in the direction and a midpoint of the light-incident surface in the direction, wherein the pitch is less than or equal to (ht)/2, and h is a light-emitting The width of the surface in the above direction, t is the width of the light incident surface in the above direction.

In an embodiment of the invention, the light emitting module further includes a flexible circuit board electrically connected to the at least one light emitting component. The light guide plate further includes a first surface and a second surface, and the light incident surface connects the first surface and the second surface. The flexible circuit board connects a portion of the first surface by an adhesive layer.

In an embodiment of the invention, the light emitting module further includes a light shielding layer. At least one of the light emitting elements has an end portion adjacent to the second surface in a direction. The light shielding layer is adhered to the second surface and the end portion of the at least one light emitting element by another adhesive layer, wherein a part of the light guide plate is located between the light shielding layer and the flexible circuit board.

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

In the light-emitting module provided by the embodiment of the present invention, the light guide plate receives the light beam emitted by the intermediate light-emitting area of the light-emitting element, and thus can have a relatively uniform color and brightness, thereby making the light-emitting module a good light source. Since the display device provided by the embodiment of the present invention has the above-described light emitting module, a good light source can be utilized to provide a good picture.

The above described features and advantages of the invention will be apparent from the following description.

A‧‧‧ spacing

D1‧‧‧ direction

h , t , h1, h2‧‧‧ width

L, L1, L2, L3, L4‧‧‧ beams

100,200‧‧‧Lighting Module

110, 210‧‧‧Lighting elements

112, 212‧‧ ‧ luminous surface

112A‧‧‧Intermediate illuminating zone

112B‧‧‧Edge illumination zone

114‧‧‧Blue LED

116‧‧‧Fluorescent structure

120, 220‧‧‧Light guide plate

122, 222‧‧‧ into the glossy surface

214‧‧‧End

221‧‧‧ first surface

223‧‧‧ second surface

230‧‧‧Soft circuit board

231, 241‧‧ ‧ adhesive layer

240‧‧‧Lighting layer

300‧‧‧ display panel

301, 321‧‧ ‧ transparent adhesive layer

310‧‧‧ display surface

320‧‧‧Protective layer

400‧‧‧Display equipment

1A is a cross-sectional view of a light emitting module in accordance with a first embodiment of the present invention.

Fig. 1B is a schematic view of a light-emitting element in a first embodiment in accordance with the present invention.

2 is a schematic diagram of a display device in accordance with a second embodiment of the present invention.

1A is a cross-sectional view of a light emitting module in accordance with a first embodiment of the present invention. Fig. 1B is a schematic view of a light-emitting element in a first embodiment in accordance with the present invention. 1A and 1B are only used to illustrate the relative relationship between the components, and some of the components are not shown to limit the size and position of the components therein for the sake of clarity. Referring 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 an intermediate light emitting region 112A and two edge light emitting regions 112B. The edge light emitting regions 112B are disposed on opposite sides of the intermediate light emitting region 112A and the intermediate light emitting region 112A is connected to the two edge light emitting regions 112B. The light emitting element 110 emits light beams L1, L2 from the light emitting surface 112. The light guide plate 120 includes a light incident surface 122 adjacent to the intermediate light emitting region 112A. The width t of the light incident surface 122 in one 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 for receiving the light beam L1 emitted from the intermediate light emitting region 112A, and the light beam emitted from the edge light emitting region 112B. L2 is offset from the light surface 122.

That is, the light incident surface 122 of the light guide plate 120 of the present embodiment receives the light. The light beam L emitted from the optical element 110 is from the light beam L1 emitted from the intermediate light-emitting area 112A, and does not receive the light beam L2 emitted from the edge light-emitting area 112B, so that the light beam L1 that can enter the light guide plate 120 is uniform in brightness and color. Higher. More specifically, in the present embodiment, the light-emitting element 110 is, for example, a white light-emitting diode. Since the light beam L emitted by the light-emitting diode has high directivity, the quality of the light beam L1 emitted from the intermediate light-emitting region 112A is Since the light beam L2 emitted from the edge light-emitting area 112B is different, the light-emitting module 100 can be made a good light source by allowing the light guide plate 120 to receive the light beam L1.

In detail, in the embodiment, the light emitting module 100 is, for example, a front light module, and the light emitting element 110 emits white light, for example, and the light emitting element 110 further includes a blue light emitting diode 114 and a fluorescent structure 116. . A yellow phosphor is disposed in the fluorescent structure 116, and a blue light emitting diode 114 is used to emit blue light. The blue light partially penetrates the phosphor structure 116, is partially absorbed by the yellow phosphor in the phosphor structure 116 and excites yellow light, and the yellow light is combined with the blue light penetrating the phosphor structure 116 to synthesize white light. Therefore, since the light beam emitted from the light emitting diode has directivity, the color temperature of the light beam L2 emitted from the edge light emitting region 112B is lower than the color temperature of the light beam L1 emitted from the intermediate light emitting region 112A. Therefore, the light guide plate 120 of the present embodiment can be used as a good light source because it receives the light beam L1 of high color temperature.

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

Referring to FIG. 1A and FIG. 1B, in the first embodiment of the present invention, the 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 region 112B deviates from the light incident surface 122. The light incident surface 122 does not receive the light beam L2. The widths of the light-emitting surface 112 and the light-incident surface 122 in the direction d1 are preferably matched. 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 the present embodiment have the above-described arrangement relationship, the light guide plate 120 can receive the uniform light beam L1.

In other words, in the present embodiment, the intermediate light-emitting region 112A of the light-emitting element 110 has a width h1 in the direction d1, and the width t of the light-incident surface 122 of the light guide plate 120 is less than or equal to the width h1 and is opposite to the portion of the intermediate light-emitting region. 112A. That is, the light guide plate 120 of the present embodiment receives the light beam L1 having a uniform color temperature provided by the intermediate light-emitting region 112A on the light-emitting surface 112 near the middle by the light-incident surface 122, and the intermediate light-emitting region 112A conforms to the light-emitting surface 112. In the above configuration relationship, the light emitting module 100 of the present embodiment can be used as a good light source.

Other embodiments are listed below for illustration. Must be stated here It is to be noted that the following embodiments use the same reference numerals and the parts of the foregoing embodiments, and the same reference numerals are used to refer to the same or similar elements, and the description of the same technical content is omitted. For the description of the omitted portions, reference may be made to the foregoing embodiments, and the following embodiments are not repeated.

2 is a schematic diagram of a display device in accordance with a second embodiment of the present invention. Referring to FIG. 2, in a second embodiment of the present invention, the 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 adjacent to the display surface 310 . The illuminating module 200 of the present embodiment is similar to the illuminating module 100 described above, except that the illuminating module 200 further includes a flexible printed circuit (FPC) 230 and a light shielding layer 240.

In the 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. The light incident surface 222 connects the first surface 221 and the second surface 223. The flexible circuit board 230 is connected to a portion of the first surface 221 by an 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 is adhered to the second surface 223 and the end portion 214 of the light emitting element 210 by another adhesive layer 241. The portion of the light guide plate 220 is located between the light shielding layer 240 and the flexible circuit board 230. In the present embodiment, the light shielding layer 240 is, for example, a light shielding tape for absorbing an additional unwanted light beam. In a preferred embodiment of the invention, the light absorbing tape has a light absorption ratio of, for example, 5% to 100%. That is, in the present embodiment, the adhesive layer 231, 241, the flexible circuit board 230, and the light shielding layer 240. The light-emitting element 210 can be disposed at an appropriate position to allow the light beam L3 from the intermediate light-emitting area of the light-emitting surface 212 to enter the light guide plate 220. Referring to FIG. 2 , in the embodiment, the first surface 221 of the light guide plate 220 is connected to the display panel 300 by the transparent adhesive layer 301 , and the second surface 223 is connected to the protective layer 320 by the transparent adhesive layer 321 . In addition, the first surface 221 or the second surface 223 may further have a microstructure, and the microstructure may reflect or refract the light beam entering the light guide plate 220 to the display panel 300, but the light guide plate of the present invention is connected with the display panel. Not limited to this. In other embodiments of the present invention, other functional components such as a touch panel may be added to the light guide plate depending on the actual application, wherein the transparent adhesive layer or the air layer may be disposed between the light guide plate and other functional components. connection.

In detail, 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 have a spacing a, wherein the spacing a is less than or equal to (h2-t)/2, and h2 is the light-emitting surface. The width of 212 in the direction d1, t is the width of the light incident surface in the above direction d1. In other words, in order to cooperate with the mechanism configuration of the overall display 400, the light-emitting module 200 in the embodiment of the present invention can adjust its position relative to the light-emitting element 210 in the direction d1 by the thin light-guide plate 220, and Limited to the center.

On the other hand, the light shielding layer 240 can absorb unnecessary light beams so that unnecessary light beams do not enter the light guide plate 220. Therefore, the light-emitting module 200 of the present embodiment can provide a 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 use. The viewer can watch, so that the user can get a good picture. In this reality In the embodiment, the display panel 300 is, for example, a liquid crystal display (LCD) panel, but the invention is not limited thereto. In other embodiments, the display panel may be an electrophoretic display panel and other reflective display panels.

In particular, in the above embodiments, the light-emitting elements of the light-emitting module are disposed on the same side of the light guide plate, but the present invention is not limited thereto. In other embodiments, the light-emitting elements may be disposed 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 illumination module provided by the embodiment of the present invention, the light incident surface of the light guide plate is disposed corresponding to the intermediate light emitting region of the light emitting element, and thus the light beam emitted by the intermediate light emitting region of the light emitting element is guided. The light beams of the light plate have similar colors and brightness, so the light beam provided by the light-emitting module as the light source also has a relatively uniform color and brightness, so the light-emitting module can be a good light source. Since the display device provided by the embodiment of the present invention has the above-described light emitting module, it is possible to illuminate the display surface of the display panel with a good light source, thereby providing a good picture.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

D1‧‧‧ direction

h, t‧‧‧ width

L, L1, L2‧‧‧ beams

100‧‧‧Lighting module

110‧‧‧Lighting elements

112‧‧‧Lighting surface

112A‧‧‧Intermediate illuminating zone

112B‧‧‧Edge illumination zone

120‧‧‧Light guide

122‧‧‧Into the glossy surface

Claims (11)

A light-emitting module includes: at least one light-emitting element, comprising a light-emitting surface, the light-emitting surface comprising an intermediate light-emitting area and two edge light-emitting areas, wherein the two edge light-emitting areas are disposed on opposite sides of the middle light-emitting area, the light-emitting element a light beam is emitted from the light emitting surface; and a light guide plate includes a light incident surface adjacent to the intermediate light emitting region, wherein the light incident surface has a width in a direction smaller than a width of the light emitting surface in the direction, and the light incident surface The light incident surface is configured to receive a portion of the light beam emitted from the intermediate light emitting region, and another portion of the light beam emitted by the two edge light emitting regions is offset from the light incident surface, wherein the light emitting surface and the light incident surface are The width of the direction is consistent Where h is the width of the illuminating surface in the direction and t is the width of the illuminating surface in the direction. The illuminating module of claim 1, wherein the illuminating surface extends beyond the illuminating surface in the direction. The illuminating module of claim 1, wherein a midpoint of the illuminating surface in the direction and a midpoint of the illuminating surface in the direction have a spacing, wherein the spacing is less than or equal to (ht )/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. The light-emitting module of claim 1, further comprising a flexible circuit board electrically connected to the at least one light-emitting component, wherein the light-guiding plate further comprises a first surface and a second surface, the light-incident surface Connecting the first surface and the second surface, the flexible circuit board connects a portion of the first surface by an adhesive layer. The lighting module of claim 4, further comprising a shading a layer, the at least one light-emitting element has an end portion adjacent to the second surface in the direction, the light-shielding layer is adhered to the second surface and the end portion of the at least one light-emitting element by another adhesive layer, A portion of the light guide plate is located between the light shielding layer and the flexible circuit board. The light-emitting module of claim 1, wherein the light-emitting module is a front light module. A display device includes a display panel including a display surface, and a light emitting module disposed adjacent to the display surface, the light emitting module includes: at least one light emitting component, including a light emitting surface, the light emitting surface including an intermediate light emitting The light emitting element emits a light beam from the light emitting surface; and a light guide plate includes a light incident surface adjacent to the light incident surface, and the two edge light emitting regions are disposed on opposite sides of the intermediate light emitting region The intermediate light-emitting area has a width in a direction smaller than a width of the light-emitting surface in the direction, and the light-incident surface is configured to receive a portion of the light beam emitted from the intermediate light-emitting area, and the two-edge light is emitted Another portion of the light beam emitted by the region is offset from the light incident surface, wherein the width of the light emitting surface and the light incident surface in the direction conforms to: Where h is the width of the illuminating surface in the direction and t is the width of the illuminating surface in the direction. The display device of claim 7, wherein the light emitting surface extends beyond the light incident surface in the direction. The display device of claim 7, wherein a midpoint of the light emitting surface in the direction and a midpoint of the light incident surface in the direction have a pitch, wherein the pitch is less than or equal to (ht) /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. The display device of claim 7, further comprising a flexible circuit board electrically connected to the at least one light emitting component, wherein the light guide plate further comprises a first surface and a second surface, the light incident surface is connected The first surface and the second surface, the flexible circuit board is connected to the first surface by an adhesive layer. The display device of claim 10, further comprising a light shielding layer, wherein the at least one light emitting element has an end portion adjacent to the second surface in the direction, and the light shielding layer is adhered by another adhesive layer a portion of the second surface and the end portion of the at least one light emitting element, wherein a portion of the light guide plate is located between the light shielding layer and the flexible circuit board.