TWI709772B - Light source module and display device - Google Patents

Abstract

A light source module including a light source, a wavelength conversion layer and a dichroic layer is provided. The light source provides a first light beam. The wavelength conversion layer is disposed on a transmission path of the first light beam and adapted to convert the first light beam into a second light beam. The dichroic layer is disposed on a light entrance surface of the wavelength conversion layer so that the dichroic layer receives the first light beam emitted from the light source earlier than the wavelength conversion layer, wherein the dichroic layer allows the first light beam to pass through and reflects the second light beam. A display device is also provided. The light source module and the display device of the invention has the effect of improving light emission efficiency.

Description

Light source module and display device

The present invention relates to a photoelectric module and a photoelectric device, and particularly relates to a light source module and a display device.

The light source module in the display device has a variety of product types, one of which uses a light-emitting element with a color conversion layer to provide an illuminating beam. Because the light beam generated by the color conversion layer is divergent, and part of the light beam may return to the inside of the light source module due to interface reflection during the process of transmitting to the outside of the light source module. Since light loss increases with the increase of light paths, current display devices that use light-emitting elements and color conversion layers to provide illumination beams have problems such as low light recovery rate and low light output efficiency.

The "prior art" paragraph is only used to help understand the content of the present invention. Therefore, the content disclosed in the "prior art" paragraph may contain some prior art that does not constitute the prior art known to those with ordinary knowledge in the technical field. The content disclosed in the "prior art" paragraph does not represent the content or the problem to be solved by one or more embodiments of the present invention, nor does it represent that it has been known or known to those with ordinary knowledge in the technical field before the application of the present invention. Cognition.

The invention provides a light source module, which helps to improve the low light recovery rate and light extraction efficiency.

The present invention also provides a display device with good display quality.

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

In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides a light source module including a light source, a color conversion layer, and a dichroic layer. The light source provides the first light beam. The color conversion layer is arranged on the transmission path of the first light beam and is suitable for converting the first light beam into a second light beam. The dichroic layer is arranged on the light incident surface of the color conversion layer, so that the dichroic layer receives the first light beam from the light source earlier than the color conversion layer, and the dichroic layer allows the first light beam to penetrate and Reflect the second light beam.

In an embodiment of the present invention, the dichroic layer has a central area color separation layer and a peripheral area color separation layer located at the periphery of the central area color separation layer. The color conversion layer overlaps the color separation layer in the central area and the color separation layer in the peripheral area, and the color separation layer in the central area and the color separation layer in the peripheral area have different transmittance or different reflectivity.

In an embodiment of the present invention, the color separation layer in the central area and the color separation layer in the peripheral area have different coverage.

In an embodiment of the present invention, the dichroic layer in the central area has a first transmittance for the first light beam, and the dichroic layer in the peripheral area has a second transmittance for the first light beam, wherein the first transmittance is greater than the second transmittance. Penetration rate.

In an embodiment of the present invention, the color separation layer in the peripheral area has the same transmittance and the same reflectance at different positions.

In an embodiment of the present invention, the light incident surface has a central area and a peripheral area located at the periphery of the central area, and the dichroic dichroic layer has a peripheral area dichroic layer overlapping with the peripheral area.

In an embodiment of the present invention, the color separation layer in the peripheral region has different transmittance or different reflectivity at different positions.

In an embodiment of the present invention, the distance between the inner edge of the dichroic layer and the edge of the dichroic layer in the peripheral area is less than or equal to 30 mm.

In an embodiment of the present invention, the light source module further includes a diffuser, wherein the dichroic layer is located between the color conversion layer and the diffuser.

In an embodiment of the present invention, the color conversion layer, the dichroic layer and the diffusion sheet are integrated into an optical film.

In an embodiment of the present invention, the light source module further includes a reflective sheet, a brightness enhancement film, and a dual brightness enhancement film. The dichroic layer is located between the color conversion layer and the reflective sheet. The color conversion layer is located between the reflective sheet and the brightness enhancement film. The brightness enhancement film is located between the color conversion layer and the dual brightness enhancement film.

In order to achieve one or part or all of the above objects or other objects, an embodiment of the present invention provides a display device including a display panel and the above light source module. The light source modules are overlapped and arranged on the display panel.

Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the light source module of the embodiment of the present invention, the dichroic layer is used to reflect the second light beam (converted light beam) transmitted toward the inside of the light source module, so that more second light beams can be output to the outside of the light source module . Therefore, the light source module of the embodiment of the present invention helps to improve the light recovery rate and the light extraction efficiency, and the display device of the embodiment of the present invention applies the above-mentioned light source module, and can have good display quality.

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

The foregoing 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 drawings. The directional terms mentioned in the following embodiments, for example: up, down, left, right, front or back, etc., are only directions for referring to the attached drawings. Therefore, the directional terms used are used to illustrate but not to limit the present invention.

FIG. 1 is a schematic cross-sectional view of a display device 1 according to a first embodiment of the invention. Please refer to FIG. 1, the display device 1 includes a display panel 10 and a light source module 12. The display panel 10 is suitable for providing image frames. For example, the display panel 10 may be a liquid crystal display panel or other non-self-luminous display panels.

The light source module 12 is overlapped on the display panel 10 and is suitable for providing an illumination light beam I. For example, the light source module 12 can be disposed under the display panel 10 to serve as a backlight module of the display device 1.

The light source module 12 may be a direct type light source module or an edge type light source module. FIG. 1 schematically illustrates an implementation aspect of a direct-type light source module, but the implementation aspect of the direct-type light source module is not limited to this, and the light source module of the present invention may also be an edge-type light source module .

The light source module 12 includes a light source 120, a color conversion layer 121 and a dichroic layer 122. The light source 120 is adapted to provide a first light beam (light beam B1). For example, the light source 120 may include one or more light emitting elements 1200. The light emitting element 1200 may be a light emitting diode (Light Emitting Diode, LED), but is not limited to this.

The color conversion layer 121 is disposed on the transmission path of the light beam B1. In the direct light source module, the color conversion layer 121 is disposed above the light source 120, and the light incident surface S1 of the color conversion layer 121 is located between the light source 120 and the light output surface S2 of the color conversion layer 121. The light incident surface S1 is the surface of the color conversion layer 121 that receives the light beam B1 from the light source 120. In other words, the light beam B1 enters the color conversion layer 121 via the light incident surface S1. The light-emitting surface S2 is a surface opposite to the light-incident surface S1, and the light-emitting surface S2 is located between the light-incident surface S1 and the display panel 10.

The color conversion layer 121 is adapted to convert the light beam B1 provided by the light source 120 into a second light beam (light beam B2). Specifically, a part of the light beam B1 transmitted to the color conversion layer 121 will be converted into the light beam B2 by the color conversion layer 121, and another part of the light beam B1 transmitted to the color conversion layer 121 will pass through the color conversion layer 121, that is, the light beam B1' . The illumination light beam I includes at least a light beam B2 converted by the color conversion layer 121 and a light beam B1' passing through the color conversion layer 121.

For example, the color conversion layer 121 may include phosphor, quantum dots, or a combination of the above two materials. Materials such as phosphors and quantum dots are suitable for absorbing short-wavelength beams and emitting long-wavelength beams, so the wavelength of beam B2 is longer than that of beam B1.

In an embodiment, the light-emitting element 1200 may be a blue light-emitting diode, and the color conversion layer 121 may include a yellow color conversion material. Correspondingly, the beam B1 and the beam B1' are blue beams, and the beam B2 may include a yellow beam. The illumination beam I is a white beam formed by mixing a blue beam and a yellow beam. In another embodiment, the color conversion layer 121 may include a red color conversion material and a green color conversion material, and the light beam B2 may include a red light beam and a green light beam. In this way, the illumination beam I is a white beam formed by mixing the red beam, the green beam, and the blue beam. However, the color types of the light-emitting element 1200 and the color conversion layer (or the colors of the light beam B1 and the light beam B2) are not limited to the above.

The dichroic layer 122 is disposed on the light incident surface S1 of the color conversion layer 121, so that the dichroic layer 122 receives the light beam B1 from the light source 120 earlier than the color conversion layer 121. Here, the dichroic layer 122 is disposed on the light incident surface S1 of the color conversion layer 121, and the dichroic layer 122 may be directly disposed on the light incident surface S1, or the dichroic layer 122 may be indirectly disposed on the light incident surface S1. On the light incident surface S1. For example, the method of forming the dichroic layer 122 and the color conversion layer 121 may include sequentially forming the color conversion layer 121 and the dichroic layer 122 on the surface of the film or substrate (hereinafter abbreviated as film/substrate), Form the dichroic layer 122 (or color conversion layer 121) on the film/substrate with the color conversion layer 121 (or the dichroic layer 122) or combine the film/substrate with the color conversion layer 121 with the film/substrate with the dichroic layer 121 The film/substrate of the color layer 122 are joined together.

The dichroic layer 122 is suitable for allowing the light beam B1 to penetrate, so that the color conversion layer 121 can receive the light beam B1. In addition, the dichroic layer 122 is also suitable for reflecting the light beam B2. For example, the dichroic layer 122 disposed on the light incident surface S1 of the color conversion layer 121 can reflect the light beam B2 (such as the light beam B2A and the light beam B2A and B2B) reflection, so that the light beams B2A and B2B originally transmitted in the direction away from the display panel 10 are transferred toward the display panel 10, that is, the light beams B2A′ and B2B′. In this way, more light beams B2 (such as light beam B2, light beam B2A', and light beam B2B') can be output to the outside of light source module 12, thereby improving the light recovery rate and light output efficiency.

In this embodiment, according to different requirements, the light source module 12 may further include other elements and/or films. For example, the light source module 12 may further include a diffusion sheet 123, a reflection sheet 124, a brightness enhancement film 125, and a dual brightness enhancement film 126.

The diffusion sheet 123 is provided on the transmission path of the light beam B1 to homogenize the light beam B1. For example, the diffusion sheet 123 may be disposed under the dichroic layer 122, and the dichroic layer 122 is located between the color conversion layer 121 and the diffusion sheet 123.

The reflective sheet 124 is disposed under the dichroic layer 122, and the dichroic layer 122 is located between the color conversion layer 121 and the reflective sheet 124. In the structure provided with the diffusion sheet 123, the diffusion sheet 123 may be located between the dichroic layer 122 and the reflection sheet 124. The light beam B1 from the light source 120 may be turned away from the display panel 10 due to interface reflection, and the reflective sheet 124 may reflect the light beam (not shown) transmitted in the direction away from the display panel 10, so that the light beam (not shown) ) Turn and pass toward the display panel 10. In this embodiment, the light source 120 is disposed on the reflective sheet 124, and the reflective sheet 124 may be a circuit substrate formed with an external reflective layer, but it is not limited to this.

The color conversion layer 121 is located between the reflective sheet 124 and the brightness enhancement film 125. The brightness enhancement film 125 is located between the color conversion layer 121 and the dual brightness enhancement film 126. The brightness enhancement film 125 and the dual brightness enhancement film 126 are suitable for concentrating the light beam to achieve a brightness enhancement effect. For example, the brightness enhancement film 125 may include a first brightness enhancement film 1250 and a second brightness enhancement film 1252, wherein the first brightness enhancement film 1250 is located between the second brightness enhancement film 1252 and the color conversion layer 121. The first brightness enhancement film 1250 may include a plurality of triangular columnar ridges T1. These triangular columnar ridges T1 respectively extend along the first direction D1 and are arranged along the second direction D2. The first direction D1 and the second direction D2 are, for example, perpendicular to each other. The second brightness enhancement film 1252 may include a plurality of triangular columnar ridges T2. These triangular columnar ridges T2 respectively extend along the second direction D2 and are arranged along the first direction D1.

In the present invention, the pattern design of the dichroic layer 122 and the arrangement of the dichroic layer 122 on the light incident surface S1 of the color conversion layer 121 can be provided corresponding to the entire light incident surface S1 of the color conversion layer 121 The dichroic layer 122 can be changed according to different design requirements. For example, in a traditional display device, the light source module may have a color shift problem in a local area of the light source module due to factors such as assembly, design, edge light leakage or light interference. Generally speaking, the color shift problem mainly occurs within 30 millimeters (milimeter, mm) from the edge of the light source module. In order to meet the demand for narrow bezels, the bezels of the display device are getting narrower and narrower, and the color cast problem at the edges gradually emerges because the edge area cannot be effectively shielded by the bezel or the bezel cannot effectively shield unexpected light. In the display device 1, the pattern design of the dichroic layer 122 and the arrangement of the dichroic layer 122 on the light incident surface S1 of the color conversion layer 121 can be used to control the beam B1 and/or the beam B2 in the light source mode. The output ratio of the central area and/or the peripheral area of the group 12 can thereby improve the color shift problem of the conventional display device.

FIG. 2A is a schematic bottom view of the color conversion layer 121 in FIG. 1. FIG. 2B is a schematic bottom view of the dichroic layer 122 in FIG. 1. However, the pattern design of the dichroic layer 122 and the arrangement of the dichroic layer 122 on the light incident surface S1 of the color conversion layer 121 are not limited to those shown in FIG. 2B.

2A and 2B, the color conversion layer 121 may have a central area R1 and a peripheral area R2 located at the periphery of the central area R1, and the dichroic layer 122 may have a central area color separation layer 1220 and a color separation layer located in the central area The color separation layer 1222 of the peripheral region of the periphery of 1220, wherein the color conversion layer 121 overlaps the color separation layer 1220 of the central region and the color separation layer 1222 of the peripheral region. Specifically, the color conversion layer 121 is, for example, a continuous film, where the light incident surface S1 of the color conversion layer 121 has a central area R1 and a peripheral area R2 located at the periphery of the central area R1. The central area R1 of the color conversion layer 121 overlaps with the central area color separation layer 1220, and the peripheral area R2 of the color conversion layer 121 overlaps with the peripheral area color separation layer 1222. It should be noted that the shape and/or size of the central area R1 and the peripheral area R2 of the color conversion layer 121 can be changed according to design requirements, and are not limited to those shown in FIG. 2A.

The distance DT between the inner edge IE of the peripheral region R2 and the edge OE of the light incident surface S1 is less than or equal to 30 mm. Correspondingly, the distance (equal to the distance DT) between the inner edge E1222 of the dichroic layer 1222 and the edge E122 of the dichroic layer 122 in the peripheral region may be less than or equal to 30 mm. The color separation layer 1220 in the central region and the color separation layer 1222 in the peripheral region may have different transmittance or different reflectivity to improve the color shift problem. It should be noted that the width of each side of the peripheral region R2 and the peripheral region color separation layer 1222 depicted in FIGS. 2A and 2B are the same (for example, the distance DT), but the present invention is not limited to this. In an embodiment, the width of each side of the peripheral region R2 and the peripheral region color separation layer 1222 may have different widths or shapes according to different requirements.

FIG. 2B schematically illustrates an implementation aspect in which the central region dichroic layer 1220 and the peripheral region dichroic layer 1222 of the dichroic layer 122 differ in transmittance (or reflectivity) due to different materials. 2B, the color separation layer 1220 in the central region includes a quadrilateral pattern surrounded by the color separation layer 1222 in the peripheral region. The area of the quadrilateral pattern is, for example, equal to the area of the central region R1. In FIG. 2B, the central area color separation layer 1220 and the peripheral area color separation layer 1222 can have the same coverage (both 100%), but the central area color separation layer 1220 and the peripheral area color separation layer 1222 are made of different materials. to make. Through the choice of materials, the transmittance and reflectance of the color separation layer 1220 in the central region and the color separation layer 1222 in the peripheral region can be independently controlled.

For example, the central region dichroic layer 1220 may have a first transmittance for the light beam B1, and the peripheral region dichroic layer 1222 may have a second transmittance for the light beam B1, wherein the peripheral region dichroic layer 1222 is at different positions Have the same transmittance and the same reflectivity. The first transmittance may be greater than the second transmittance to increase the beam B1 output from the central region R1. Conversely, the first transmittance may be less than the second transmittance to increase the light beam B1 output from the peripheral area R2. On the other hand, the central area dichroic layer 1220 may have a first reflectance for the light beam B2, and the peripheral area dichroic layer 1222 may have a second reflectance for the light beam B2. The first reflectivity may be less than the second reflectivity to increase the light beam B2 output from the peripheral area R2. Conversely, the first transmittance may be greater than the second transmittance to increase the beam B2 output from the central region R1. In this way, the transmittance and reflectivity of the beam B1 and the beam B2 of each area are adjusted to improve the color shift problem.

Please refer to FIG. 3, which is a schematic bottom view of another embodiment of the dichroic layer 122A. In this embodiment, the color separation layer 1220A in the central area includes a plurality of dichroic units U. The dichroic units U are arranged in a checkerboard pattern at intervals along the first direction D1 and the second direction D2. On the other hand, the color separation layer 1222 in the peripheral area includes a frame pattern connected with a plurality of dichroic units U on the periphery. In particular, the transmittance (or reflectance) here is calculated by means of regional averages. For example, the transmittance (or reflectivity) of the color separation layer 1220A in the central region corresponds to the transmittance (or reflectivity) of the region where the multiple dichroic units U in the central region R1 of FIG. The sum of the transmittance (or reflectivity) of the area outside of the two dichroic units U is averaged.

FIG. 3 schematically illustrates an implementation aspect in which the transmittance (or reflectance) is different due to the different coverage. In FIG. 3, the color separation layer 1220A in the central region and the color separation layer 1222 in the peripheral region can be made of the same material, but the color separation layer 1220A in the central region and the color separation layer 1222 in the peripheral region can have different coverage. The coverage of the color separation layer 1220A in the central area is defined as the proportion of the central area R1 covered by multiple dichroic units U, and the coverage of the color separation layer 1222 in the peripheral area is defined as the coverage of the peripheral area R2 by the dichroic material proportion. In this embodiment, the coverage rates of the color separation layer 1220A in the central area and the color separation layer 1222 in the peripheral area are 50% and 100%, respectively. Thereby, the beam B1 output by the central area R1 can be increased, that is, the beam B2 output by the central area R1 can be reduced, and the output of each area to the beam B1 and the beam B2 can be adjusted to change the beam ratio of the illumination beam I in each area. Improve the color cast problem. In another embodiment, the material of the plurality of dichroic units U and the material of the color separation layer 1222 in the peripheral area may also be different materials.

4 is a schematic cross-sectional view of the optical film F applicable to the display device 1 of FIG. 1. The color conversion layer 121, the dichroic layer 122, and the diffusion sheet 123 in FIG. 1 can be integrated into the optical film F to facilitate assembly, but it is not limited thereto.

FIG. 5 is a schematic cross-sectional view of the display device 2 according to the second embodiment of the present invention. Referring to FIG. 5, the main differences between the display device 2 and the display device 1 are as follows. In the display device 2, the light source module 22 is an edge light source module. Furthermore, the light source module 22 may further include a light guide plate 220. The light source 120 is arranged beside the light guide plate 220, and the light beam B1 output by the light source 120 enters the light guide plate 220 through the side SS of the light guide plate 220. The light beam B1 entering the light guide plate 220 is transmitted from the side adjacent to the light source 120 to the side away from the light source 120 via total internal reflection (TIR). The bottom surface SB of the light guide plate 220 may be formed with a plurality of microstructures (not shown) to destroy the total internal reflection, so that the light beam B1 is emitted from the top surface ST of the light guide plate 220. Under the structure of the edge light source module, the light source module 22 may or may not include the diffuser 123 in FIG. 1. When the light source module 22 includes the diffusion sheet 123 in FIG. 1, the color conversion layer 121, the dichroic layer 222, and the diffusion sheet 123 can be integrated into the optical film F shown in FIG. 4, but it is not limited thereto.

The pattern design of the dichroic layer 222 and the arrangement of the dichroic layer 222 on the light incident surface S1 of the color conversion layer 121 in FIG. 5 can be changed according to different design requirements. 6 is a schematic bottom view of the light source 120, the color conversion layer 121, and the dichroic layer 222 in FIG. 5. 2A and FIG. 6, the main differences between the dichroic layer 222 and the dichroic layer 122 in FIG. 2B are as follows. In FIG. 6, the dichroic layer 222 has a peripheral area color separation layer 2222 overlapping with the peripheral area R2, but does not have the central area color separation layer 1220 of FIG. 2B, but the present invention is not limited thereto. In another embodiment, the area overlapping with the central area R1 in FIG. 6 can also be provided with a central area color separation layer 1220 according to requirements to achieve the function of adjusting the color shift.

The distance (equal to the distance DT) between the inner edge E2222 of the dichroic layer 2222 and the edge E222 of the dichroic layer 222 in the peripheral area is also less than or equal to 30 mm. In addition, the color separation layer 2222 in the peripheral region has different transmittance or different reflectivity at different positions. Further, the color separation layer 2222 in the peripheral region may have a first portion 2222A, two second portions 2222B, and a third portion 2222C, wherein the first portion 2222A is opposite to the third portion 2222C, and the first portion 2222A is closer to the third portion 2222C Light source 120. The two second parts 2222B are opposite to each other and respectively connect the first part 2222A and the third part 2222C. The first part 2222A, the two second parts 2222B, and the third part 2222C may have different transmittance or different reflectivity.

As far as the traditional light source module is concerned, the light intensity of the light beam B1 output from the near light source side of the light source module is higher than the light intensity of the light beam B1 output from the far light source side of the light source module. In addition, the light intensity of the light beam B1 output by the light source module connecting the opposite sides of the near light source side and the far light source side will be lower than the light intensity of the light beam B1 output by the near light source side, but higher than the light beam output by the far light source side. The light intensity of B1. In order to improve the above-mentioned color shift problem, the transmittance of the third portion 2222C to the beam B1 may be greater than the transmittance of each of the second portions 2222B to the beam B1, and the transmittance of each of the second portions 2222B to the beam B1 The transmittance of the first portion 2222A to the light beam B1 can be greater than that of the light beam B1 to improve the uniformity of the light beam B1. However, the number, distribution, and respective transmittance or reflectance of each part of the color separation layer 2222 in the peripheral area can be changed according to requirements (for example, according to the arrangement of the light source), and is not limited thereto. This embodiment is not limited to being applied to edge light sources, and other light source types (such as direct light sources) can also be applied to the embodiment in which the color separation layer in the peripheral area has different transmittance or different reflectance at different positions. .

In summary, the embodiments of the present invention have at least one of the following advantages or effects. In the light source module of the embodiment of the present invention, the dichroic layer is used to reflect the second light beam transmitted toward the inside of the light source module, so that more second light beams can be output to the outside of the light source module. Therefore, the light source module of the embodiment of the present invention helps to improve the light recovery rate and light extraction efficiency. In addition, the dichroic layer can be arranged in response to the color shift of different regions in the light source module, so that the colors of the light beams output from different regions in the light source module are more consistent. Therefore, the light source module of the embodiment of the present invention also helps to improve the color shift problem at the edge of the light source module, and the display device of the embodiment of the present invention applies the above-mentioned light source module, and can have good display quality.

However, the foregoing are only preferred embodiments of the present invention, and should not be used to limit the scope of implementation of the present invention, that is, simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the description of the invention, All are still within the scope of the invention patent. In addition, any embodiment of the present invention or the scope of the patent application does not need to achieve all the objectives or advantages or features disclosed in the present invention. In addition, the abstract part and title are only used to assist in searching for patent documents, not to limit the scope of rights of the present invention. In addition, the terms "first" and "second" mentioned in this specification or the scope of the patent application are only used to name the element (element) or to distinguish different embodiments or ranges, and are not used to limit the number of elements. Upper or lower limit.

1, 2: Display device 10: Display panel 12, 22: light source module 120: light source 1200: Light-emitting element 121: color conversion layer 122, 122A, 222: dichroic layer 1220: color separation layer in the central area 1222, 2222: color separation layer in the surrounding area 123: diffuser 124: reflective sheet 125: Brightening film 1250: The first brightness enhancement film 1252: The second brightness enhancement film 126: Double Brightening Film 220: light guide plate 2222A: Part One 2222: Part Two 2222C: Part Three B1, B1’, B2, B2A, B2A’, B2B, B2B’: beam D1: First direction D2: second direction DT: distance F: Optical film I: Illumination beam IE, E1222, E2222: inner edge OE, E122, E222: Edge R1: Central area R2: Surrounding area S1: Light incident surface S2: Glossy surface SB: bottom SS: side ST: Top surface T1: Triangular columnar scallop T2: Triangular Columnar Snake U: Two-way color separation unit

FIG. 1 is a schematic cross-sectional view of a display device according to a first embodiment of the invention. FIG. 2A is a schematic bottom view of the color conversion layer in FIG. 1. Fig. 2B is a schematic bottom view of the dichroic layer in Fig. 1. Fig. 3 is a schematic bottom view of another embodiment of the dichroic layer. 4 is a schematic cross-sectional view of an optical film applicable to the display device of FIG. 1. FIG. 5 is a schematic cross-sectional view of a display device according to a second embodiment of the invention. FIG. 6 is a schematic bottom view of the light source, color conversion layer and dichroic layer in FIG. 5.

1: display device

10: Display panel

12: Light source module

120: light source

1200: Light-emitting element

121: color conversion layer

122: dichroic layer

123: diffuser

124: reflective sheet

125: Brightening film

1250: The first brightness enhancement film

1252: The second brightness enhancement film

126: Double Brightening Film

B1, B1’, B2, B2A, B2A’, B2B, B2B’: beam

D1: First direction

D2: second direction

I: Illumination beam

S1: Light incident surface

S2: Glossy surface

T1: Triangular columnar scallop

T2: Triangular Columnar Snake

Claims (12)

A light source module includes: A light source, providing a first light beam; A color conversion layer disposed on the transmission path of the first light beam, the color conversion layer being adapted to convert the first light beam into a second light beam; and A dichroic layer is disposed on a light incident surface of the color conversion layer, so that the dichroic layer receives the first light beam from the light source earlier than the color conversion layer, wherein the dichroic layer The color layer allows the first light beam to penetrate and reflects the second light beam. The light source module described in item 1 of the scope of patent application, wherein the dichroic layer has a central area color separation layer and a peripheral area color separation layer located at the periphery of the central area color separation layer, and the color conversion layer The color separation layer of the central region and the color separation layer of the peripheral region are overlapped, and the color separation layer of the central region and the color separation layer of the peripheral region have different transmittance or different reflectivity. The light source module described in item 2 of the scope of patent application, wherein the color separation layer in the central area and the color separation layer in the peripheral area have different coverage. The light source module described in item 2 of the scope of patent application, wherein the central area dichroic layer has a first transmittance for the first light beam, and the peripheral area dichroic layer has a second transmittance for the first light beam. Transmittance, wherein the first transmittance is greater than the second transmittance. The light source module described in item 2 of the scope of patent application, wherein the color separation layer of the peripheral region has the same transmittance and the same reflectivity at different positions. The light source module described in item 1 of the scope of patent application, wherein the light incident mask has a central area and a peripheral area located at the periphery of the central area, and the dichroic layer has a peripheral area overlapping the peripheral area Regional separation layer. The light source module described in item 6 of the scope of patent application, wherein the color separation layer of the peripheral area has different transmittance or different reflectivity at different positions. The light source module described in item 6 of the scope of patent application, wherein the distance between the inner edge of the dichroic layer of the peripheral region and the edge of the dichroic layer is less than or equal to 30 mm. The light source module described in item 1 of the scope of patent application further includes: A diffusion sheet, wherein the dichroic layer is located between the color conversion layer and the diffusion sheet. The light source module as described in item 9 of the scope of patent application, wherein the color conversion layer, the dichroic layer and the diffusion sheet are integrated into an optical film. The light source module described in item 1 of the scope of patent application further includes: A reflective sheet, wherein the dichroic layer is located between the color conversion layer and the reflective sheet; A brightness enhancement film, wherein the color conversion layer is located between the reflective sheet and the brightness enhancement film; and A dual brightness enhancement film, wherein the brightness enhancement film is located between the color conversion layer and the dual brightness enhancement film. A display device includes: A display panel; and A light source module overlapped on the display panel and includes: A light source, providing a first light beam; A color conversion layer disposed on the transmission path of the first light beam, the color conversion layer being adapted to convert the first light beam into a second light beam; and A dichroic layer is disposed on a light incident surface of the color conversion layer, so that the dichroic layer receives the first light beam from the light source earlier than the color conversion layer, wherein the dichroic layer The color layer allows the first light beam to penetrate and reflects the second light beam.

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