Patent ID: 12197081

DESCRIPTION OF THE EMBODIMENTS

FIG.1Ais a schematic top view of a light-emitting module according to an embodiment of the invention,FIG.1Bis a schematic cross-sectional view of the light-emitting module along line I-I inFIG.1A, andFIG.1Cis a schematic cross-sectional view of the light-emitting module along line II-II inFIG.1A.FIG.2is a schematic top view of the substrate and the light-emitting elements of the light-emitting module inFIG.1A. Referring toFIGS.1A to1CandFIG.2, the light-emitting module100in this embodiment includes a substrate110, a plurality of light-emitting elements120, a window plate130, and an encapsulant140. The light-emitting elements120are disposed on the substrate110and have a plurality of light colors. In this embodiment, the light-emitting elements120include at least one first color light-emitting diode120a(a plurality of first color light-emitting diodes120aare exemplarily shown inFIG.1A), at least one second color light-emitting diode (a plurality of second color light-emitting diodes120bare exemplarily shown inFIG.1A), and at least one third light-emitting diode (a plurality of first color light-emitting diodes120care exemplarily shown inFIG.1A).

In this embodiment, one of the first color light-emitting diode120a, the second color light-emitting diode120b, and the third color light-emitting diode120cis a red light-emitting diode, another one of the first color light-emitting diode120a, the second color light-emitting diode120b, and the third color light-emitting diode120cis a green light-emitting diode, and the other one of the first color light-emitting diode120a, the second color light-emitting diode120b, and the third color light-emitting diode120cis a blue light-emitting diode.

The window plate130is disposed on light-emitting surfaces121of the light emitting elements120. The encapsulant140wraps the light-emitting elements120and surrounds the window plate130. In this embodiment, the window plate130is a transparent plate, and lights123emitted by the light-emitting elements120pass through the window plate130to form an illumination beam125. In this embodiment, the top surface132of the window plate130facing away from the light-emitting elements120may be a flat surface. However, in other embodiments, the top surface132aof the window plate130facing away from the light-emitting elements120may be a random scattering surface (e.g. a rough surface) as shown inFIG.1D, or the top surface132bof the window plate130facing away from the light-emitting elements120may be a surface having microlenses133barranged in an array as shown inFIG.1E. Moreover, the window plate130may be made of glass or a plastic material (for example, an acrylic-based plastic material).

In the light-emitting module100in this embodiment of the invention, a plurality of light-emitting elements120having a plurality of light colors are adopted to provide lights123with different colors, and a window plate130is adopted to guide the lights123out, so that the light-emitting module100in this embodiment can provide color illumination with enough power.

In this embodiment, each of the light-emitting elements120has a top electrode122beside the light-emitting surface121thereof and at a top side of the light-emitting element120facing away from the substrate110, and the window plate130exposes the top electrode122. In this embodiment, each of the light-emitting elements120also has a bottom electrode at a bottom side of the light-emitting element120adjacent to the substrate110. However, in other embodiments, each of the light-emitting elements120may have two top electrodes at the top side of the light-emitting element120, or each of the light-emitting elements120may have two bottom electrodes at the bottom side of the light-emitting element120. In this embodiment, the top electrode122is located at a corner of the light-emitting surface121, exposed by the window plate130, and covered by the encapsulant140. In this embodiment, the encapsulant140is, for example, sealing glue. The color of the encapsulant140may be black, white, or any other suitable color. The encapsulant140may have a diffusive surface and act as a sealant to protect light-emitting diodes and bonding wires of light-emitting diodes.

In this embodiment, the light-emitting elements120are symmetrically disposed on the substrate110with respect to a line of symmetry A1. In this embodiment, a side S1of each of the light-emitting elements120is not parallel to a side S2of the substrate110, and is not perpendicular to the side of the substrate110. In other words, the side S1is inclined with respect to the side S2.

FIG.3Ais a schematic top view of a light-emitting module according to another embodiment of the invention,FIG.3Bis a schematic cross-sectional view of the light-emitting module along line III-III inFIG.3A, andFIG.3Cis a schematic cross-sectional view of the light-emitting module along line IV-IV inFIG.3A. Referring toFIGS.3A to3C, the light-emitting module100din this embodiment is similar to the light-emitting module100inFIG.1A, and the main difference therebetween is as follows. In the light-emitting module100din this embodiment, the side surface S3of the window plate130is coated with a reflective film150. For example, the window plate130may have four side surfaces S3all coated with reflective films150. The reflective film150may well reflect lights123emitted from the light-emitting elements120in inclined directions to the window plate130, so that the power of the color illumination provided by the light-emitting module100dis further increased. The reflective film150may prevents the leakage of lights123to the encapsulant140and help for mixing lights123with different colors into a more uniform white light.

FIGS.4A to4Dare schematic top views of a substrate and light-emitting elements of a light-emitting module according to other embodiments of the invention. Referring toFIGS.4A to4D,FIGS.4A to4Dshow different arrangement ways of light-emitting elements120disposed on the substrate110. InFIGS.4A to4D, the first light-emitting diodes120a, the second light-emitting diodes120b, and the third light-emitting diodes120cmay be alternately arranged in different ways. In an embodiment, the number of the light-emitting elements120in the substrate110may be 3 to 1000. The side length L1of each of the light-emitting elements120may be 1 micron to 1000 microns.

FIGS.5A to5Eare schematic top views of a substrate and light-emitting elements of a light-emitting module according to other embodiments of the invention. Referring toFIG.5A to5E, in these embodiments, a side S1of each of the light-emitting elements120is parallel or perpendicular to a side S2of the substrate110. In these embodiments, the first light-emitting diodes120a, the second light-emitting diodes120b, and the third light-emitting diodes120cmay be alternately arranged in different ways.

FIGS.6A to6Care schematic top views of a substrate and light-emitting elements of a light-emitting module according to other embodiments of the invention. Referring toFIG.6AandFIG.6B, in the two embodiments, an area of the light-emitting surface121of the first color light-emitting diode120ais greater than an area of the light-emitting surface121of the second color light-emitting diode120band greater than an area of the light-emitting surface121of the third color light-emitting diode120c. InFIG.6C, an area of the light-emitting surface121of the first color light-emitting diode120ais equal to an area of the light-emitting surface121of the second color light-emitting diode120band equal to an area of the light-emitting surface121of the third color light-emitting diode120c, the light-emitting elements120with the same color is arranged in the same row.

FIG.7is a schematic cross-section view of a front-lit LCOS module according to an embodiment of the invention. Referring toFIG.7, the front-lit LCOS module200in this embodiment includes any one of the aforementioned light-emitting modules in various embodiments (the light-emitting module100is taken as an example in the following), a first polarizer210, a waveguide220, an LCOS panel230, and a second polarizer240. The first polarizer210is disposed on a path of the illumination beam125from the light-emitting module100and configured to polarize the illumination beam125. In an embodiment, the first polarizer210is a wire grid polarizer film. The waveguide220has a first surface222, a second surface224opposite to the first surface222, and a light incident surface226connecting the first surface222with the second surface224, wherein the illumination beam125from the first polarizer210enters the waveguide220through the light incident surface226. The LCOS panel230is disposed below the second surface224and configured to convert the illumination beam125into a polarized image beam231. The second polarizer240is disposed on the first surface222and configured to allow the polarized image beam231to pass through, wherein the polarized image beam231from the LCOS panel230passes through the second surface224, the first surface222, and the second polarizer240in sequence. In an embodiment, the illumination beam125polarized by the first polarizer210has a first polarization direction P1, the polarized image beam231has a second polarization direction P2, and the first polarization direction P1is perpendicular to the second polarization direction P2. Moreover, the second polarizer240allows light having the second polarization direction P2(i.e. the polarized image beam231) to pass through.

In this embodiment, the front-lit LCOS module200in this embodiment further includes a plurality of micro-mirrors250disposed along the first surface222at intervals and configured to reflect the illumination beam125to the LCOS panel230. In this embodiment, the light-emitting elements120having different light colors are configured to emit lights123with different colors in turn. For example, a first color light, a second color light and a third color light are emitted in sequence, so that the front-lit LCOS module200may be a color sequential front-lit LCOS module. In this embodiment, the front-lit LCOS module200may further include at least one coupling lens260(two coupling lenses260are exemplarily shown inFIG.7) disposed between the light-emitting module100and the first polarizer210and configured to couple the illumination beam125to the first polarizer210.

In this embodiment, since the light-emitting module100can provide color illumination with enough power, the front-lit LCOS module200in this embodiment can provide a color image beam with enough intensity.

In conclusion, in the light-emitting module and the front-lit LCOS module according to the embodiment of the invention, a plurality of light-emitting elements having a plurality of light colors are adopted to provide lights with different colors, and a window plate is adopted to guide the lights out, so that the light-emitting module according to the embodiment of the invention can provide color illumination with enough power. Therefore, the front-lit LCOS module according to the embodiment of the invention can provide a color image beam with enough intensity.

It will be apparent to those 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 disclosure. In view of the foregoing, it is intended that the disclosure covers modifications and variations provided that they fall within the scope of the following claims and their equivalents.