Light-emitting module and front-illuminated liquid crystal on silicon module

Abstract

To provide a light emitting module capable of providing color lighting with sufficient power.SOLUTION: A light emitting module 100 includes a substrate 110, a plurality of light emitting elements 120, a window plate 130, and an encapsulant 140. The light emitting elements 120 are disposed on the substrate 110 and have a plurality of light colors. The light emitting elements 120 are exemplified by at least one light emitting diode 120a of a first color, at least one light emitting diode 120b of a second color, and at least one light emitting diode 120c of a third color. The window plate 130 is disposed on the light emitting surface of the light emitting elements 120. The encapsulant 140 encapsulates the light emitting elements 120 and surrounds the window plate 130. A front-illuminated liquid crystal on silicon module is also provided.SELECTED DRAWING: Figure 1A

Description

[Technical field]

[0001] The present invention relates generally to optical modules, and more particularly to light emitting modules and front-illuminated liquid crystal on silicon (LCOS) modules. [Background technology]

[0002] With the advancement of display technology, light valves are created to convert an illumination beam from a light source into an image beam. A projection lens is arranged on the path of the image beam and configured to project the image onto a screen to form an image on the screen. Thus, a user can view the image on the screen. Generally, light valves are classified into LCOS panels and digital micro-mirror devices (DMDs).

[0003] Some traditional LCOS panels have color filters, which allows the LCOS panel to provide color images. For example, the color filters divide a pixel into a red subpixel, a green subpixel, and a blue subpixel. However, the subpixels reduce the resolution of the LCOS panel. If the LCOS had pixels that were not divided into subpixels of different colors, the resolution of the LCOS could be higher, but a color light source is required to illuminate the LCOS. However, traditional LCOS modules do not have a color light source that provides illumination with sufficient power. Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, the present invention is directed to a light emitting module that can provide color lighting with sufficient power.

[0005] The present invention is directed to a front-illuminated LCOS module that can provide a color image beam with sufficient power. [Means for solving the problem]

[0006] One embodiment of the present invention provides a light emitting module, including a substrate, a plurality of light emitting elements, a window pane, and an encapsulant. The light emitting elements are disposed on the substrate and have a plurality of light colors. The window pane is disposed on the light emitting surface of the light emitting elements. The encapsulant encapsulates the light emitting elements and surrounds the window pane.

[0007] An embodiment of the present invention provides a front-illuminated liquid crystal on silicon (LCOS) module, including the light emitting module described above, a first polarizer, a waveguide, an LCOS panel, and a second polarizer. Light emitted from the light emitting element passes through a window plate to form an illumination beam. The first polarizer is disposed on a path of the illumination beam and configured to polarize the illumination beam. The waveguide has a first surface, a second surface opposite to the first surface, and a light incidence surface connecting the first surface and the second surface, and the illumination beam from the first polarizer enters the waveguide through the light incidence surface. The LCOS panel is disposed below the second surface and configured to convert the illumination beam into a polarized image beam. The second polarizer is disposed on the first surface and configured to allow the polarized image beam to pass therethrough, and the polarized image beam from the LCOS panel passes through the second surface, the first surface, and the second polarizer in sequence. Effect of the Invention

[0008] In the light emitting module and the front-illuminated LCOS module according to the embodiment of the present invention, a plurality of light emitting elements having a plurality of light colors are employed to provide light of different colors, and a window plate is employed to guide the light, so that the light emitting module according to the embodiment of the present invention can provide color illumination with sufficient power, and therefore the front-illuminated LCOS module according to the embodiment of the present invention can provide a color image beam with sufficient power.

[0009] In order to make the foregoing more easily understandable, several embodiments are described in detail below with reference to the drawings. [Brief description of the drawings]

[0010] The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. [Figure 1A] 1 is a schematic top view of a light emitting module according to one embodiment of the present invention; [Figure 1B] 1B is a schematic cross-sectional view of the light-emitting module taken along line II of FIG. 1A. [Figure 1C] 1B is a schematic cross-sectional view of the light-emitting module taken along line II-II in FIG. 1A. [Figure 1D] 2 is a schematic cross-sectional view of a light-emitting module according to another embodiment of the present invention. [Figure 1E] 2 is a schematic cross-sectional view of a light-emitting module according to another embodiment of the present invention. [Diagram 2] 1B is a schematic top view of a substrate and a light-emitting element of the light-emitting module of FIG. 1A. [Figure 3A] 2 is a schematic top view of a light emitting module according to another embodiment of the present invention. [Figure 3B] 3B is a schematic cross-sectional view of the light-emitting module taken along line III-III in FIG. 3A. [Figure 3C] 4 is a schematic cross-sectional view of the light-emitting module taken along line IV-IV in FIG. 3A. [Figure 4A] 4 is a schematic top view of a substrate and a light-emitting element of a light-emitting module according to another embodiment of the present invention. [Figure 4B] 4 is a schematic top view of a substrate and a light-emitting element of a light-emitting module according to another embodiment of the present invention. [Figure 4C] 4 is a schematic top view of a substrate and a light-emitting element of a light-emitting module according to another embodiment of the present invention. [Figure 4D] 4 is a schematic top view of a substrate and a light-emitting element of a light-emitting module according to another embodiment of the present invention. [Figure 5A] 4 is a schematic top view of a substrate and a light-emitting element of a light-emitting module according to another embodiment of the present invention. [Figure 5B] 4 is a schematic top view of a substrate and a light-emitting element of a light-emitting module according to another embodiment of the present invention. [Figure 5C] 4 is a schematic top view of a substrate and a light-emitting element of a light-emitting module according to another embodiment of the present invention. [Figure 5D] 4 is a schematic top view of a substrate and a light-emitting element of a light-emitting module according to another embodiment of the present invention. [Figure 5E] 4 is a schematic top view of a substrate and a light-emitting element of a light-emitting module according to another embodiment of the present invention. [Figure 6A] 4 is a schematic top view of a substrate and a light-emitting element of a light-emitting module according to another embodiment of the present invention. [Figure 6B] 4 is a schematic top view of a substrate and a light-emitting element of a light-emitting module according to another embodiment of the present invention. [Figure 6C] 4 is a schematic top view of a substrate and a light-emitting element of a light-emitting module according to another embodiment of the present invention. [Figure 7] 1 is a schematic cross-sectional view of a front-illuminated LCOS module according to one embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] FIG 1A is a schematic top view of a light emitting module according to an embodiment of the present invention. FIG 1B is a schematic cross-sectional view of the light emitting module taken along line I-I in FIG 1A. FIG 1C is a schematic cross-sectional view of the light emitting module taken along line II-II in FIG 1A. FIG 2 is a schematic top view of a substrate and a light emitting element of the light emitting module of FIG 1A. Referring to FIG 1A to FIG 1C and FIG 2, a light emitting module 100 in this embodiment includes a substrate 110, a plurality of light emitting elements 120, a window plate 130, and an encapsulant 140. The light emitting element 120 is disposed on the substrate 110 and has a plurality of light colors. In this embodiment, the light-emitting element 120 includes at least one first-color light-emitting diode 120a (FIG. 1A illustrates a plurality of first-color light-emitting diodes 120a), at least one second-color light-emitting diode 120b (FIG. 1A illustrates a plurality of second-color light-emitting diodes 120b), and at least one third-color light-emitting diode 120c (FIG. 1A illustrates a plurality of third-color light-emitting diodes 120c).

[0012] In this embodiment, one of the first color light emitting diode 120a, the second color light emitting diode 120b, and the third color light emitting diode 120c is a red light emitting diode, another one of the first color light emitting diode 120a, the second color light emitting diode 120b, and the third color light emitting diode 120c is a green light emitting diode, and the other one of the first color light emitting diode 120a, the second color light emitting diode 120b, and the third color light emitting diode 120c is a blue light emitting diode.

[0013] The window plate 130 is disposed on the light-emitting surface 121 of the light-emitting element 120. The encapsulant 140 encases the light-emitting element 120 and surrounds the window plate 130. In this embodiment, the window plate 130 is a transparent plate, and the light 123 emitted from the light-emitting element 120 passes through the window plate 130 to form an illumination beam 125. In this embodiment, the upper surface 132 of the window plate 130 opposite the light-emitting element 120 may be a flat surface. However, in other embodiments, the upper surface 132a of the window plate 130 opposite the light-emitting element 120 may be a randomly scattering surface (e.g., a rough surface) as shown in FIG. 1D, or the upper surface 132b of the window plate 130 opposite the light-emitting element 120 may be a surface on which microlenses 133b are arranged in an array as shown in FIG. 1E. Furthermore, the window plate 130 may be made of glass or a plastic material (e.g., an acrylic plastic material).

[0014] In the light-emitting module 100 in this embodiment of the present invention, a plurality of light-emitting elements 120 having a plurality of light colors are adopted to provide light 123 of different colors, and a window panel 130 is adopted to guide the light 123, so that the light-emitting module 100 in this embodiment can provide color lighting with sufficient power.

[0015] In this embodiment, each light-emitting element 120 has an upper electrode 122 on its light-emitting surface 121 side and on the upper surface of the light-emitting element 120 opposite to the substrate 110, and the window plate 130 exposes the upper electrode 122. In this embodiment, each light-emitting element 120 also has a lower electrode on the bottom surface of the light-emitting element 120 adjacent to the substrate 110. However, in other embodiments, each light-emitting element 120 may have two upper electrodes on the top surface of the light-emitting element 120, or each light-emitting element 120 may have two lower electrodes on the bottom surface of the light-emitting element 120. In this embodiment, the upper electrode 122 is located at the corner of the light-emitting surface 121, exposed by the window plate 130, and covered by the encapsulant 140. In this embodiment, the encapsulant 140 is, for example, a sealing adhesive. The color of the encapsulant 140 may be black, white, or other suitable color. The encapsulant 140 has a diffusive surface and can function as a sealant to protect the light-emitting diode and the bonding wire of the light-emitting diode.

[0016] In this embodiment, the light emitting elements 120 are arranged symmetrically with respect to a line of symmetry A1 on the substrate 110. In this embodiment, the side S1 of each light emitting element 120 is neither parallel to the side S2 of the substrate 110 nor perpendicular to the side S2 of the substrate 110. In other words, the side S1 is inclined with respect to the side S2.

[0017] FIG. 3A is a schematic top view of a light emitting module according to another embodiment of the present invention. FIG. 3B is a schematic cross-sectional view of the light emitting module taken along line III-III in FIG. 3A. FIG. 3C is a schematic cross-sectional view of the light emitting module taken along line IV-IV in FIG. 3A. Referring to FIG. 3A to FIG. 3C, the light emitting module 100d of this embodiment is similar to the light emitting module 100 of FIG. 1A, and the main differences between them are as follows. In the light emitting module 100d of this embodiment, the side surface S3 of the window plate 130 is coated with a reflective film 150. For example, the window plate 130 may have all four side surfaces S3 coated with the reflective film 150. The reflective film 150 can well reflect the light 123 emitted from the light emitting element 120 in an oblique direction relative to the window plate 130, so that the output of color lighting provided by the light emitting module 100d can be further improved. The reflective film 150 prevents the light 123 from leaking into the encapsulant 140, and contributes to mixing the different color lights 123 into a more uniform white light.

[0018] 4A to 4D are schematic top views of a substrate and a light-emitting element of a light-emitting module according to another embodiment of the present invention. Referring to FIG. 4A to FIG. 4D, FIG. 4A to FIG. 4D show different arrangement methods of the light-emitting element 120 arranged on the substrate 110. In FIG. 4A to FIG. 4D, the first light-emitting diode 120a, the second light-emitting diode 120b, and the third light-emitting diode 120c may be arranged alternately in different ways. In one embodiment, the number of the light-emitting elements 120 in the substrate 110 may be 3 to 1000. The length L1 of one side of each light-emitting element 120 may be 1 micron to 1000 microns.

[0019] 5A to 5E are schematic top views of a substrate and a light-emitting element of a light-emitting module according to another embodiment of the present invention. Referring to FIG. 5A to 5E, in these embodiments, the side S1 of each light-emitting element 120 is parallel or perpendicular to the side S2 of the substrate 110. In these embodiments, the first light-emitting diode 120a, the second light-emitting diode 120b, and the third light-emitting diode 120c may be alternately arranged in different ways.

[0020] 6A to 6C are schematic top views of a substrate and a light-emitting element of a light-emitting module according to another embodiment of the present invention. Referring to Fig. 6A and Fig. 6B, in these two embodiments, the area of ​​the light-emitting surface 121 of the first color light-emitting diode 120a is larger than that of the second color light-emitting diode 120b, and is larger than that of the third color light-emitting diode 120c. In Fig. 6C, the area of ​​the light-emitting surface 121 of the first color light-emitting diode 120a is equal to that of the second color light-emitting diode 120b, and is equal to that of the third color light-emitting diode 120c, and the light-emitting elements 120 of the same color are arranged in the same row.

[0021] FIG. 7 is a schematic cross-sectional view of a front-illuminated LCOS module according to an embodiment of the present invention. Referring to FIG. 7, the front-illuminated LCOS module 200 in this embodiment includes any one of the above-mentioned light-emitting modules in various embodiments (hereinafter, the light-emitting module 100 is taken as an example), a first polarizer 210, a waveguide 220, an LCOS panel 230, and a second polarizer 240. The first polarizer 210 is disposed on the path of the illumination beam 125 from the light-emitting module 100 and configured to polarize the illumination beam 125. In one embodiment, the first polarizer 210 is a wire grid polarizing film. The waveguide 220 has a first surface 222, a second surface 224 opposite to the first surface 222, and a light incidence surface 226 connecting the first surface 222 and the second surface 224, where the illumination beam 125 from the first polarizer 210 enters the waveguide through the light incidence surface 226. The LCOS panel 230 is disposed below the second surface 224 and configured to convert the illumination beam 125 into a polarized image beam 231. The second polarizer 240 is disposed on the first surface 222 and configured to pass the polarized image beam 231, where the polarized image beam 231 from the LCOS panel 230 passes through the second surface 224, the first surface 222, and the second polarizer 240 in sequence. In one embodiment, the illumination beam 125 polarized by the first polarizer 210 has a first polarization direction P1, and the polarized image beam 231 has a second polarization direction P2, where the first polarization direction P1 is perpendicular to the second polarization direction P2. Furthermore, the second polarizer 240 passes light having the second polarization direction P2 (i.e., the polarized image beam 231).

[0022] In this embodiment, the front-illuminated LCOS module 200 of this embodiment further includes a plurality of micromirrors 250 spaced apart along the first surface 222 and configured to reflect the illumination beam 125 to the LCOS panel 230. In this embodiment, the light-emitting elements 120 having different light colors are configured to sequentially emit light 123 of different colors. For example, the first color light, the second color light, and the third color light are sequentially emitted, so that the front-illuminated LCOS module 200 may be a color-sequential front-illuminated LCOS module. In this embodiment, the front-illuminated LCOS module 200 may further include at least one coupling lens 260 (two coupling lenses 260 are illustrated in FIG. 7 ) disposed between the light-emitting module 100 and the first polarizer 210 and configured to couple the illumination beam 125 to the first polarizer 210.

[0023] In this embodiment, the light emitting module 100 can provide color illumination with sufficient power, so that the front-illuminated LCOS module 200 of this embodiment can provide a color image beam with sufficient power.

[0024] In summary, the light emitting module and the front-illuminated LCOS module according to the embodiment of the present invention adopt multiple light emitting elements with multiple light colors to provide different color lights, and adopt a window plate to guide the light, so that the light emitting module according to the embodiment of the present invention can provide color illumination with sufficient power. Therefore, the front-illuminated LCOS module according to the embodiment of the present invention can provide a color image beam with sufficient power.

[0025] It will be apparent to one skilled in the art that various modifications and variations can be made to the disclosed embodiments without departing from the scope or spirit of the invention. In view of the above, it is intended that the present invention cover modifications and variations provided they come within the scope of the following claims and their equivalents. [Industrial Applicability]

[0026] The light emitting module and front-illuminated LCOS module of the present invention can be applied to a lighting system or a projector. [Explanation of symbols]

[0027] 100, 100d: Light emitting module 110: Circuit board 120: Light emitting element 120a: first color light emitting diode 120b: second color light emitting diode 120c: third color light emitting diode 121: Light-emitting surface 122: Upper electrode 123: Light 125: Lighting beam 130: Window board 132, 132a, 132b: Top surface 133b: Microlens 140: Encapsulating materials 150: Reflective film 200: Front-illuminated Liquid Crystal on Silicon (LCOS) Module 210: First polarizer 220: Waveguide 222: First Side 224: The Second Side 226: Light incidence surface 230: LCOS Panel 231: Polarized image beam 240: Second polarizer 250: Micromirror 260: Combined Lens A1: Line of symmetry L1: Side length P1: First polarization direction P2: Second polarization direction S1, S2: Edges S3: Side

Claims

1. A substrate; A plurality of light emitting elements having a plurality of light colors are disposed on the substrate; a window plate disposed on the light emitting surfaces of the plurality of light emitting elements; a sealing material that encases the plurality of light-emitting elements and surrounds the window plate.

2. 10. The light emitting module of claim 1, wherein the plurality of light emitting elements comprises at least one light emitting diode of a first color, at least one light emitting diode of a second color, and at least one third light emitting diode.

3. 3. The light emitting module according to claim 2, wherein an area of ​​the light emitting surface of the first color light emitting diode is larger than an area of ​​the light emitting surface of the second color light emitting diode and is larger than an area of ​​the light emitting surface of the third color light emitting diode.

4. 3. The light emitting module of claim 2, wherein one of the first color light emitting diode, the second color light emitting diode, and the third color light emitting diode is a red light emitting diode, another one of the first color light emitting diode, the second color light emitting diode, and the third color light emitting diode is a green light emitting diode, and the other one of the first color light emitting diode, the second color light emitting diode, and the third color light emitting diode is a blue light emitting diode.

5. The light-emitting module according to claim 1 , wherein each of the plurality of light-emitting elements has an upper electrode on a light-emitting surface side thereof, and the window plate exposes the upper electrode.

6. The light-emitting module according to claim 1 , wherein a side surface of the window plate is coated with a reflective film.

7. The light-emitting module according to claim 1 , wherein the plurality of light-emitting elements are arranged symmetrically on the substrate with respect to a line of symmetry.

8. The light emitting module according to claim 1 , wherein a side of each of the plurality of light emitting elements is neither parallel to a side of the substrate nor perpendicular to the side of the substrate.

9. The light-emitting module according to claim 1 , wherein each side of the plurality of light-emitting elements is parallel or perpendicular to the side of the substrate.

10. A substrate; A plurality of light emitting elements having a plurality of light colors are disposed on the substrate; a window plate disposed on a light emitting surface of the plurality of light emitting elements, through which light emitted by the plurality of light emitting elements passes to form an illumination beam; a sealing material that encases the plurality of light-emitting elements and surrounds the window plate; A light emitting module comprising: a first polarizer disposed in a path of the illumination beam and configured to polarize the illumination beam; a waveguide having a first surface, a second surface opposite to the first surface, and a light incidence surface connecting the first surface and the second surface, the waveguide receiving the illumination beam from the first polarizer through the light incidence surface; a liquid crystal on silicon (LCOS) panel disposed beneath the second surface and configured to convert the illumination beam into a polarized image beam; a second polarizer disposed on the first surface and configured for the polarized image beam to pass therethrough, the polarized image beam from the LCOS panel passing through the second surface, the first surface, and the second polarizer in sequence.

11. 11. The front-illuminated LCOS module of claim 10, wherein the plurality of light-emitting elements comprises at least one light-emitting diode of a first color, at least one light-emitting diode of a second color, and at least one third light-emitting diode.

12. 12. The front-illuminated LCOS module of claim 11, wherein an area of ​​the light-emitting surface of the first color light-emitting diode is larger than an area of ​​the light-emitting surface of the second color light-emitting diode and larger than an area of ​​the light-emitting surface of the third color light-emitting diode.

13. 12. The front-illuminated LCOS module of claim 11, wherein one of the first color light emitting diode, the second color light emitting diode, and the third color light emitting diode is a red light emitting diode, another one of the first color light emitting diode, the second color light emitting diode, and the third color light emitting diode is a green light emitting diode, and the other one of the first color light emitting diode, the second color light emitting diode, and the third color light emitting diode is a blue light emitting diode.

14. 11. The front-illuminated LCOS module according to claim 10, wherein each of the plurality of light-emitting elements has an upper electrode on its light-emitting surface side, and the window plate exposes the upper electrode.

15. The front-illuminated LCOS module according to claim 10 , wherein a side surface of the window plate is coated with a reflective film.

16. The front-illuminated LCOS module according to claim 10 , wherein the light-emitting elements are arranged symmetrically on the substrate with respect to a line of symmetry.

17. 11. The front-illuminated LCOS module of claim 10, wherein a side of each of the plurality of light-emitting elements is neither parallel to a side of the substrate nor perpendicular to the side of the substrate.

18. The front-illuminated LCOS module according to claim 10 , wherein a side of each of the plurality of light-emitting elements is parallel or perpendicular to the side of the substrate.

19. 11. The front-illuminated LCOS module of claim 10, further comprising a plurality of micromirrors disposed along the first surface and configured to reflect the illumination beam onto the LCOS panel.

20. 11. The front-illuminated LCOS module of claim 10, wherein the plurality of light-emitting elements having different light colors are configured to sequentially emit light of different colors.

Images