阅读说明：本技术 具有不同雾度的扩散色轮及投影装置的照明模块 (Diffusion color wheel with different haze and illumination module of projection device ) 是由 陈信安 张世欣 于 2019-03-08 设计创作，主要内容包括：本发明提供一种具有不同雾度的扩散色轮及投影装置的照明模块,投影装置的照明模块包括至少一同调光源、一合光组件及一扩散色轮。至少一同调光源用以产生不同波段的多个同调光束。合光组件位于多个同调光束的路径上,以合并多个同调光束。扩散色轮包括一透光基板、一扩散层及一光学镀膜层。透光基板具有一第一表面以及一相对于第一表面的第二表面；扩散层具有多个光学微结构区设置于第一表面或第二表面上,多个光学微结构区具有不同雾度；光学镀膜层设置于多个光学微结构区上。当不同波段的多个同调光束投射在具有不同雾度的多个光学微结构区,产生不同扩散角度,经过透镜聚合以迭加多个不同光程的同调光束,从而消除或减少色斑。(The invention provides a diffusion color wheel with different haze and an illumination module of a projection device. The at least one coherent light source is used for generating a plurality of coherent light beams with different wave bands. The light combining component is positioned on the paths of the plurality of coherent light beams so as to combine the plurality of coherent light beams. The diffusion color wheel comprises a light-transmitting substrate, a diffusion layer and an optical coating layer. The light-transmitting substrate is provided with a first surface and a second surface opposite to the first surface; the diffusion layer is provided with a plurality of optical microstructure areas arranged on the first surface or the second surface, and the optical microstructure areas have different haze values; the optical coating layer is arranged on the plurality of optical microstructure areas. When a plurality of coherent light beams with different wave bands are projected on a plurality of optical microstructure areas with different haze degrees, different diffusion angles are generated, and the coherent light beams with different optical paths are superposed through lens polymerization, so that color spots are eliminated or reduced.)

1. A diffusing color wheel with different haze comprising:

the light-transmitting substrate is provided with a first surface and a second surface opposite to the first surface;

a diffuser layer having a plurality of optical microstructure areas disposed on the first surface or the second surface, the plurality of optical microstructure areas having different haze values; and

the optical coating layer is arranged on the plurality of optical microstructure areas;

the coherent light beams with different wave bands are projected on the optical micro-structure areas with different haze degrees to generate different diffusion angles, and are polymerized by the lens to superpose the coherent light beams with different optical paths, so that color spots are eliminated or reduced.

2. The diffusing color wheel according to claim 1, wherein the plurality of optical microstructure areas are connected in a fan shape, the optical microstructure area of each fan shape has different haze, and the difference between the haze of two adjacent optical microstructure areas is 5% to 10%.

3. The diffusing color wheel according to claim 2, wherein the different haze values are formed by microparticles of the same size occupying different proportions of the area within the optical microstructure area, wherein the microparticles occupy more than 0% and less than 50% of the area of the plurality of optical microstructure areas.

4. The diffusing color wheel according to claim 2, wherein the different haze values are different roughness values formed by forming microparticles of different particle sizes on the plurality of optical microstructure areas.

5. The diffusing color wheel according to claim 4, wherein the microparticles of the plurality of optical microstructure areas are between 0.01 and 1 micron.

6. The diffusing color wheel according to claim 2, wherein the plurality of optical microstructure areas are located on the first surface of the light-transmitting substrate and the second surface is a smooth surface.

7. The diffusing color wheel according to claim 1, wherein the plurality of optical microstructure areas are located on the first surface and the second surface of the light-transmitting substrate, respectively.

8. The diffusing color wheel according to claim 1, wherein the plurality of optical microstructures of the diffusing layer form a circular ring-shaped haze patch and have a graded haze distribution.

9. The diffusing color wheel according to claim 8, wherein the optical microstructure areas are made of the same material as the transparent substrate.

10. An illumination module for a projection device, comprising:

at least one coherent light source to generate a plurality of coherent light beams with different wave bands;

a light combining component, located on the path of the plurality of coherent light beams, to combine the plurality of coherent light beams; and

a diffusing color wheel receiving the combined plurality of coherent light beams, the diffusing color wheel comprising:

the light-transmitting substrate is provided with a first surface and a second surface opposite to the first surface;

a diffuser layer having a plurality of optical microstructure areas disposed on the first surface or the second surface, the plurality of optical microstructure areas having different haze values; and

the optical coating layer is arranged on the plurality of optical microstructure areas;

the plurality of coherent light beams with different wave bands are projected on the plurality of optical microstructure areas with different haze degrees to generate different diffusion angles, and the coherent light beams with different optical paths are overlapped through lens polymerization, so that color spots are eliminated or reduced.

Technical Field

The present invention relates to a diffusing color wheel with different haze and an illumination module of a projection apparatus, and more particularly, to an illumination module suitable for a projection apparatus, which has a rotating diffusing color wheel and is suitable for an optical projection system having a multi-band coherent light beam.

Background

The lamp bulbs used for the illumination module of the optical projection system are metal halide bulbs or ultra-high pressure mercury bulbs. However, such light sources have disadvantages of large size, high heat, high power consumption and short lifetime. At present, laser is used as a projection light source, so that the optical efficiency can be improved. Under the same high-brightness display, the power consumption is greatly reduced, and a complex optical lens assembly can be omitted.

Although laser projection has many advantages, laser is a coherent light source, and a projection image generates color spots or spots (speckle) on an irradiated surface due to an interference phenomenon, thereby causing a defect of blurred image.

Therefore, how to provide a color wheel capable of diffusing color spots for use in an illumination module of a projection apparatus to overcome the above-mentioned drawbacks is a very important issue to be solved by those skilled in the art.

Disclosure of Invention

The invention aims to solve the technical problem of providing a diffusion color wheel with different haze, which can combine lasers in various wave bands and eliminate color spots.

In order to solve the above technical problem, according to one aspect of the present invention, a color wheel with different haze levels is provided, which includes a transparent substrate, a diffusion layer, and an optical coating layer. The light-transmitting substrate is provided with a first surface and a second surface opposite to the first surface; the diffusion layer is provided with a plurality of optical microstructure areas, the optical microstructure areas are arranged on the first surface or the second surface, and the optical microstructure areas have different haze values; the optical coating layer is arranged on the plurality of optical microstructure areas; the coherent light beams with different wave bands are projected on a plurality of optical microstructure areas with different haze degrees to generate different diffusion angles, and are polymerized by a lens to superpose a plurality of coherent light beams with different optical paths, so that color spots are eliminated or reduced.

In addition, the present invention is directed to provide an illumination module of a projection apparatus, which can combine laser beams of various wavelength bands and eliminate color spots.

In order to solve the above technical problem, according to an aspect of the present invention, an illumination module of a projection apparatus is provided, which includes at least one coherent light source for generating a plurality of coherent light beams with different wavelength bands, a light combining component, and a diffusion color wheel. The light combining component is positioned on the paths of the plurality of coherent light beams so as to combine the plurality of coherent light beams; a diffusing color wheel receiving the combined plurality of coherent light beams, the diffusing color wheel comprising:

the light-transmitting substrate is provided with a first surface and a second surface opposite to the first surface; the diffusion layer is provided with a plurality of optical microstructure areas, the optical microstructure areas are arranged on the first surface or the second surface, and the optical microstructure areas have different haze values; the optical coating layer is arranged on the plurality of optical microstructure areas; the coherent light beams with different wave bands are projected on a plurality of optical microstructure areas with different haze degrees to generate different diffusion angles, and are polymerized by a lens to superpose a plurality of coherent light beams with different optical paths, so that color spots are eliminated or reduced.

Preferably, according to one embodiment of the present invention, the plurality of optical microstructure areas are connected in a fan shape, each of the fan-shaped optical microstructure areas has a different haze, and the difference between the haze of two adjacent optical microstructure areas is 5% to 10%.

Preferably, according to one of the embodiments of the present invention, the different haze values are formed by microparticles with the same particle size occupying different proportions of areas in the optical microstructure area, wherein the microparticles occupy more than 0% and less than 50% of the area of the plurality of optical microstructure areas.

Preferably, according to one aspect of the present invention, the haze is different by forming microparticles with different particle sizes on the plurality of optical microstructure areas to form different roughness.

Preferably, according to one embodiment of the present invention, the microparticles of the plurality of optical microstructure areas are between 0.01 microns and 1 micron.

Preferably, according to one aspect of the present invention, the plurality of optical microstructure areas are located on the first surface of the light-transmitting substrate, and the second surface is a smooth surface.

Preferably, according to one aspect of the present invention, the plurality of optical microstructure regions are respectively located on the first surface and the second surface of the light-transmitting substrate.

Preferably, according to one aspect of the present invention, the plurality of optical microstructures of the diffusion layer form a circular haze patch, and have a graded haze distribution.

Preferably, according to one aspect of the present invention, the material of the optical microstructure area is the same as that of the light-transmitting substrate.

The invention has the following beneficial effects: the diffusion color wheel provided by the invention is provided with a plurality of optical microstructure areas with different haze, so that a plurality of coherent light beams with different wave bands can generate different diffusion angles, and the coherent light beams with different optical paths are superposed through lens polymerization, thereby eliminating color spots. Therefore, good projection light can be provided for the illumination module of the projection device.

To further clarify the techniques, methods and advantages of the present invention, a better understanding of the invention, as will be realized, will be obtained by reference to the following detailed description of the invention and the accompanying drawings which are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

Drawings

Fig. 1 is a schematic view of an illumination module of a projection apparatus according to the present invention.

Fig. 2 is a schematic perspective exploded view of the diffusion color wheel and the rotating unit according to the present invention.

Fig. 3 is a schematic perspective view of the diffusion color wheel and the rotating unit according to the present invention.

Fig. 4 is a top view of the diffusion color wheel according to the first embodiment of the present invention.

Fig. 5 is a cross-sectional view of a diffusing color wheel according to a first embodiment of the present invention.

Fig. 6 is an enlarged view of the section VI of the diffusion color wheel of fig. 5 according to the present invention.

Fig. 7 is an enlarged view of a section VII of the diffusion color wheel of fig. 5 according to the present invention.

Fig. 8 is a top view of a diffusing color wheel according to a second embodiment of the present invention.

Fig. 9 is a cross-sectional view of a diffusing color wheel according to a third embodiment of the present invention.

Detailed Description

Referring to fig. 1 to 3, fig. 1 is a schematic view illustrating an illumination module of a projection apparatus according to the present invention. Fig. 2 and fig. 3 are a three-dimensional exploded schematic view and a three-dimensional assembled schematic view of the diffusion color wheel and the rotation unit according to the present invention. The illumination module (illumination module)100 of the projection apparatus of the present invention can be applied to a projection apparatus (not shown). The illumination module 100 includes at least one coherent light source (110, 120, 130), a light combining component 140, a first lens group 150, a diffusion color wheel 10, and a second lens group 160. The diffusion color wheel 10 may be driven by a rotating unit M (e.g., a motor) so that the diffusion color wheel 10 can rotate along a central axis C. The first lens group 150 and the second lens group 160 each include at least one lens for converging light, but not limited thereto.

Coherent light sources are light sources that emit coherent light beams, such as laser light sources. The coherent light source may be an array of a plurality of laser diodes arranged to output high power laser light. The number of laser diodes of the coherent light source can be flexibly adjusted to be suitable for the projection device with different brightness requirements. In the present embodiment, the lighting module 100 may include a first coherent light source 110, a second coherent light source 120, and a third coherent light source 130, and the coherent light sources (110, 120, 130) respectively emit a first coherent light beam L1, a second coherent light beam L2, and a third coherent light beam L3 with different wavelengths. For example, the wavelength of the first coherent light beam L1 emitted by the first coherent light source 110 is between 440 nanometers and 495 nanometers; the wavelength of the second coherent light beam L2 emitted by the second coherent light source 120 may be between 495 nm and 580 nm; the wavelength of the third coherent light beam emitted by the third coherent light source L3 may be between 610 nm and 750 nm, but the invention is not limited thereto.

In another embodiment, the illumination module 100 may be provided with only one coherent light source, such as a blue laser beam, and the color diversity of the coherent light beams emitted from the illumination module 100 is improved through the arrangement of the fluorescent wheel (fluorescent wheel) and the color wheel (color wheel).

The lighting module 100 of the present embodiment may further include a light combining component 140, which can combine the first coherent light beam L1, the second coherent light beam L2, and the third coherent light beam L3 with different colors. The light combining component 140 may be a dichroic mirror (dichroic), a dichroic filter (dichroic filter), or a light combining prism (X-cube).

First embodiment

Referring to fig. 4 to fig. 7, fig. 4 and fig. 5 are a top view and a cross-sectional view of a diffusion color wheel according to a first embodiment of the present invention. One of the features of the present invention is to provide a diffusion color wheel 10a with different haze, as shown in fig. 5, the diffusion color wheel 10a includes a transparent substrate 11, a diffusion layer 12a, and an optical coating layer 13. The transparent substrate 11 has a first surface 111 and a second surface 112 opposite to the first surface 111. The diffusing color wheel 10a has a plurality of optical microstructure areas 122, 124, 126, 128. The plurality of optical microstructure areas 122, 124, 126, 128 have different haze (gloss). In this embodiment, the plurality of optical microstructure regions 122, 124, 126, and 128 are disposed on the first surface 111 of the light-transmitting substrate 11, and the second surface 112 is a smooth surface. However, the present embodiment is not limited thereto, and may also be disposed on the second surface 112, or separately disposed on the first surface 111 and the second surface 112.

The plurality of optical microstructure areas 122, 124, 126, and 128 of the diffusing color wheel 10a of this embodiment are respectively connected in a fan shape, each of the fan-shaped optical microstructure areas 122, 124, 126, and 128 has different haze, and the difference between the haze of two adjacent optical microstructure areas is 5% to 10%. The different haze (gloss) may be roughness (roughness) formed by microparticles of different sizes, for example, the roughness of the optical microstructure area 128 shown in fig. 6 is greater than the roughness of the optical microstructure area 126 shown in fig. 7. Wherein the microparticles of the plurality of optical microstructure regions 122, 124, 126, 128 are between 0.01 microns and 1 micron. Alternatively, the different haze (gloss) may be the same size of microparticles occupying different proportions of area within the optical microstructure region. For example, optical microstructure region 122 has about 10% of the same 0.01 micron microparticles, optical microstructure region 124 has about 20% of the same 0.01 micron microparticles, optical microstructure region 126 has about 30% of the same 0.01 micron microparticles, and optical microstructure region 128 has about 40% of the same 0.01 micron microparticles. Preferably, the micro-particles of the optical microstructure area of the present embodiment occupy an area greater than 0% and less than 50%.

According to the invention, through the above structure design, the first coherent light beam L1, the second coherent light beam L2, and the third coherent light beam L3 with different wavebands are projected onto the plurality of optical microstructure areas 122, 124, 126, 128 with different haze values to generate different diffusion angles, and are polymerized by the second lens 160 to superpose a plurality of coherent light beams with different optical paths, so as to eliminate or reduce color spots (speckles). From another perspective, when the first coherent light beam L1, the second coherent light beam L2, and the third coherent light beam L3 of different wavelength bands are irradiated onto the rough surfaces of the plurality of optical microstructure areas 122, 124, 126, 128 of the diffusion layer 12a, the color spots (speckles) are uniformly overlapped and eliminated or reduced due to the persistence of vision caused by the rapid movement of the rough surfaces. Describing the mechanism of the present invention for removing color spots from another perspective, when a plurality of optical microstructure areas with different roughness are formed by microparticles with different particle sizes, when the first coherent light beam L1, the second coherent light beam L2, and the third coherent light beam L3 with different wavelength bands are overlapped after passing through optical paths with different thicknesses, the color spots (speckles) can be removed or reduced due to phase overlapping. Therefore, at least one or more coherent light beams can be projected on the diffusing color wheel 10a, and the effect of eliminating or reducing color spots can be achieved by the diffusing layer 12a disposed on the diffusing color wheel 10 a.

The optical coating layer 13 of the present invention may be disposed on the plurality of optical microstructure areas. Wherein the optical coating layer 13 covers at least 10% to 100% of the surface area of the first surface 111 or the second surface 112. It should be noted that the optical coating layer 13 may be a single layer film, a double layer film or a multi-layer film, and the invention is not limited thereto. The optical Coating layer 13 may be an Anti-Reflection Coating (Anti-Reflection Coating) or a High-Reflection Coating (High-Reflection Coating). Therefore, at least one or more coherent light beams projected on the diffusion color wheel 10a can pass through the diffusion color wheel 10a or be reflected by the diffusion color wheel 10a through the diffusion color wheel 10 a.

Please refer to fig. 6 and fig. 7, which are enlarged cross-sectional views of the diffusion color wheel 10a passing through the optical microstructure area 128 and the optical microstructure area 126, respectively. The optical coating layer 13 of the present embodiment may be an antireflection film, and preferably, the optical coating layer 13 has a refractive index between 1.2 and 1.9. When the light beams of the first coherent light source 110, the second coherent light source 120, and the third coherent light source 130 are all projected onto the first surface 111 of the rotatable transparent substrate 11, the first coherent light beam L1, the second coherent light beam L2, and the third coherent light beam L3 may sequentially pass through the optical coating layer 13, the optical micro-structure layer (122, 124, 126, 128), the first surface 111 of the transparent substrate 11, the body 11 of the transparent substrate 11, and the second surface 112 of the transparent substrate 11, so as to form a plurality of first projection light beams R1, second projection light beams R2, and third projection light beams R3 projected from the second surface 112. That is to say, in the diffusion color wheel 10a of the embodiment, the first surface 111 of the light-transmitting substrate 11 may serve as the light-entering side of the diffusion color wheel 10a, and the second surface 112 of the light-transmitting substrate 11 may serve as the light-exiting side of the diffusion color wheel 10 a.

However, the invention is not limited thereto, and in other embodiments, the optical coating layer 13 may be a highly reflective film, and the plurality of laser projection beams may be projected from the second surface 112 of the transparent substrate 11 by reflection in consideration of the overall configuration of the projector. In another embodiment, the second surface 112 of the transparent substrate 11 may be coated with an optical coating layer 13 of a highly reflective film. The first coherent light beam L1, the second coherent light beam L2, and the third coherent light beam L3 may also be projected on the second surface 112 of the transparent substrate 11 to form projection light beams reflected by the second surface 112.

Second embodiment

Fig. 8 is a top view of a diffusing color wheel with different haze according to a second embodiment of the present invention. The difference between the diffusing color wheel 10b of the present embodiment and the above embodiments is that the plurality of optical microstructures (as represented by 121 and 129) of the diffusing layer 12b form a circular haze patch and have a graded haze distribution. For example, the optical microstructure area 121 has about 5% of the same 0.01 μm micro-particles, the ratio of the area occupied by the micro-particles gradually increases along the clockwise direction and/or the counterclockwise direction of the diffusing color wheel 10b, and the optical microstructure area 129 opposite to the optical microstructure area 121 may have about 50% of the same 0.01 μm micro-particles. However, the present embodiment is not limited thereto, and the distribution of the microparticles may be changed along a direction parallel to the diameter from one circumferential position to another circumferential position, which is opposite to the circumferential position, in a stripe shape.

It should be noted that the material of the optical microstructure regions (as shown in 121 and 129) of the diffusion layer 12b and the material of the light-transmitting substrate 11 may be the same, and the refractive indexes of the two regions are the same. For example, the optical microstructure area may be made of a material of the transparent substrate 11, and the micro particles are sprayed on the first surface 111 or the second surface 112 of the transparent substrate 11 by a spraying method. Alternatively, minute optical structures are printed on the surface of the transparent substrate 11 to change the light traveling direction and achieve the diffusion function. However, the invention is not limited thereto, and the material of the optical microstructure area and the material of the light-transmitting substrate may be different, and the material of the optical microstructure area may be, for example, synthetic resin.

Third embodiment

Fig. 9 is a cross-sectional view of a diffusion color wheel with different haze according to a third embodiment of the present invention. The difference between the diffusion color wheel 10c of the present embodiment and the above embodiments is that the optical microstructures 123 of the diffusion layer 12c are located on the second surface 112 of the light-transmitting substrate 11, and the portion of the first surface 111 opposite to the optical microstructures 123 may be a smooth surface; the optical microstructures 125 are disposed on the first surface 111 of the light-transmitting substrate 11, and the portion of the second surface 112 opposite to the optical microstructures 125 can be a smooth surface.

The diffusion color wheel has the characteristics and functions that the diffusion color wheel is provided with a diffusion layer consisting of a plurality of optical microstructure areas with different haze, the optical microstructure areas can be positioned on different surfaces of a light-transmitting substrate, so that laser beams pass through different thicknesses to generate optical path difference, or the laser beams pass through different haze surfaces to generate different diffusion angles, and then are polymerized by a lens, so that light spots (spots) are eliminated or reduced.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.