CN1570692A - Projection display device - Google Patents

Abstract

A projection display device, comprising: a light source; a focusing lens set located at one side of the light source to converge the light emitted by the light source; a diffraction lens set located at one side of the focusing lens set to make the focusing lens set located between the light source and the diffraction lens set to raise the half-brightness angle of the light transmitted from the focusing lens set; a display unit located at the other side of the diffraction mirror group to receive the light emitted from the light source and provide image; a polarized light separator (PBS) located in the space surrounded by the display unit and the diffraction mirror group, reflecting the light emitted by the light source to the display unit and making the light emitted by the display unit penetrate; a refractor set to deflect and enlarge the image provided by the display unit. The invention can effectively amplify the image provided by the micro display, reduce the loss of light scattering in the projection light advancing path, greatly reduce the weight and the volume of the projection device and is suitable for various occasions.

Description

projection display device

technical field

The invention relates to a display device, in particular to a projection display device suitable for a micro-flat display.

Background technique

In recent years, projection display devices have been widely used in various occasions. They are not only suitable for playing presentations or videos in public places, but also penetrate into homes, becoming the mainstream of a new generation of audio-visual entertainment equipment. The current development trend of projection display devices is to develop projectors that are light in weight, small in size, and can provide good brightness and image amplification quality; especially portable projectors are very popular because they are easy to carry and can be used anytime and anywhere. In addition, due to the great progress of the micro-flat display and its light source, the micro-display can be applied to the projection display device, which greatly saves the weight and volume of the projector. Therefore, if it can be matched with a good optical engine, a good Zoom in on image quality.

On the other hand, in general projectors, during the traveling process of the projected light, when the light travels through a plurality of combinations of penetrating environments, the luminosity of the light is reduced due to scattering, which reduces the light utilization rate and consumes the light source. luminosity and power consumption.

Contents of the invention

The main purpose of the present invention is to provide a projection display device, which can effectively enlarge the image provided by the microdisplay, reduce the loss of light scattering in the path of projection light, and greatly reduce the weight and volume of the projection device, which is suitable for various occasions. .

In order to achieve the above purpose, a projection display device provided by the present invention mainly includes:

a light source to provide light;

A focusing lens group is located on one side of the light source to concentrate the light emitted by the light source;

A diffraction lens group is located on one side of the focusing lens group, so that the focusing lens group is located between the light source and the diffraction lens group, so as to increase the half-luminance angle of the light transmitted by the focusing lens group;

A display unit is located on the other side of the diffraction lens group, so that the diffraction lens group is located between the focusing lens group and the display unit, and the display unit is not located between the focusing lens group and the diffraction lens group on the straight line formed to receive the light emitted by the light source and provide an image;

A polarized light separator (PBS), which is located in the space surrounded by the display unit and the diffractive mirror group, reflects the light emitted by the light source to the display unit, and allows the light emitted by the display unit to pass through ;

a refracting mirror group to deflect and enlarge the image provided by the display unit;

The light emitted by the light source passes through the focusing lens group to the diffractive lens group, then travels to the polarized light separator, is reflected by the polarized light separator to the display unit, and is provided by the display unit The light rays pass through the polarized light separator, reach the refracting mirror group, and are transformed by the refracting mirror group to form an enlarged real image.

In order to achieve the above purpose, another projection display device provided by the present invention mainly includes:

a light source to provide light;

A focusing lens group is located on one side of the light source to concentrate the light emitted by the light source;

A diffraction lens group is located on one side of the focusing lens group, so that the focusing lens group is located between the light source and the diffraction lens group, so as to increase the half-luminance angle of the light transmitted from the focusing lens group;

A display unit is located on the other side of the diffraction lens group, so that the diffraction lens group is located between the focusing lens group and the display unit, and the display unit is located between the focusing lens group and the diffraction lens group on the straight line formed to receive the light emitted by the light source and provide an image;

A polarized light separator (PBS) is located in the space surrounded by the display unit and the diffractive mirror group, so as to transmit the light emitted by the light source to the display unit and reflect the light emitted by the display unit ;

a refracting mirror group to deflect and enlarge the image provided by the display unit;

The light emitted by the light source passes through the focusing lens group to the diffractive lens group, then travels to the polarized light separator, and passes through the polarized light separator to the display unit, and is displayed by the display unit The provided light is reflected by the polarized light separator, reaches the refracting mirror group, and is transformed by the refracting mirror group to form an enlarged real image.

The type of light source of the present invention is not limited, preferably LED, car light bulb or Xe light bulb. The focusing lens group of the present invention is mainly used to concentrate the light emitted by the light source, and its type is not limited, and it is preferably a focusing lens. The main function of the diffractive lens group of the present invention is to increase the half-brightness angle of the light so that the originally scattered light can be converted into parallel light, preferably including a horizontal diffractive lens and a vertical diffractive lens. The type of the display unit of the present invention is not limited, it is preferably an LCD or a micro-flat display, more preferably a HTPS micro-display, an LCOS micro-display or a DMD micro-display. The refracting lens group of the present invention is used to magnify the image provided by the microdisplay, preferably comprising at least one convex lens, more preferably comprising at least one convex lens and a magnifying glass; the function of the convex lens is to magnify the image and form a magnified real image behind the mirror , so its number is unlimited, if the magnification of one convex lens is A, then n convex lenses can reach the magnification of An. In order to reflect the light from the light source and at the same time allow the light on the display to pass through, the polarized light separator of the present invention forms an angle X with the display unit, and the value of X is between 0 degrees and 90 degrees, and the The polarized light separator also forms an angle Y with the refraction unit, and the value of Y is between 0° and 90°; the value of X and the value of Y are more preferably 45°. The present invention may further include a color wheel (color wheel) located between the light source and the focusing lens group to provide the desired color of the image.

Description of drawings

FIG. 1 is a schematic diagram of a preferred example of the projection display device of the present invention;

FIG. 2 is a schematic diagram of another preferred example of the projection display device of the present invention.

Detailed ways

In order to enable your examiners to better understand the technical content of the present invention, the following preferred specific embodiments are specially cited as follows.

Example 1

Please refer to FIG. 1 . FIG. 1 is a schematic diagram of a preferred example of the projection display device of the present invention. This embodiment includes an L-shaped housing 100, a light source (Xe bulb) 110, a color wheel 120, a focusing lens group 130, a diffractive lens group 140, an LCOS microdisplay 150, a PBS 160, and several convex lenses 170 (refracting lens group) and a magnifying lens 180 (convex lens); the above-mentioned diffractive lens group includes a vertical diffractive sheet and a horizontal diffractive sheet. Wherein, the color wheel 120 is located between the light source 110 and the focusing lens group 130 , and the focusing lens group 130 is located between the color wheel 120 and the diffractive lens group 140 . The LCOS microdisplay 150 is located on the vertical line formed by the light source 110 and the diffractive lens group 140, and a PBS160 is placed in the space surrounded by the diffractive lens group 140 and the display 150, with the display 150 as a reference, The PBS160 is placed at an angle of 45 degrees to provide a good light splitting function. A plurality of convex lenses 170 are disposed at a proper distance above the PBS 160 , and a convex lens 180 is placed at the opening of the casing 100 . The light emitted by the light source 110 penetrates through the focusing lens 130 to the diffractive lens group 140 , through the diffractive lens group 140 all the light is adjusted to be horizontal and then transmitted to the PBS160 , reflected by the PBS160 to the microdisplay 150 , and the light reflected by the microdisplay 150 passes through the PBS 160 , passes through a plurality of convex lenses 170 and 180 to form a magnified real image, and is projected onto the screen 190 .

Example 2

Please refer to FIG. 2 , which is a schematic diagram of another preferred example of the projection display device of the present invention. This embodiment includes an L-shaped housing 200, a light source (Xe bulb) 210, a color wheel 220, a focusing lens group 230, a diffractive lens group 240, an LCOS microdisplay 250, a PBS260, and a convex lens 270 A plurality of convex lenses can be added between the convex lens 270 and the PBS 260 depending on the required magnification; the above-mentioned diffractive lens set includes a vertical diffractive sheet and a horizontal diffractive sheet. Wherein, the color wheel 220 is located between the light source 210 and the focusing lens group 230 , and the focusing lens group 230 is located between the color wheel 220 and the diffractive lens group 240 . The LCOS microdisplay 250 is positioned on the straight line formed by the light source 210 and the diffractive lens group 240, and a PBS260 is placed in the middle between the diffractive lens group 240 and the display 250. With the display 250 as a reference, the PBS260 is placed at an angle of 45 degrees. placed to provide good spectroscopic performance. A convex lens 270 is placed just at the opening of the casing 200 .

The light emitted by the light source 210 penetrates through the focusing lens 230 to the diffractive lens group 240, and then through the diffractive lens group 240, all the light is adjusted to be horizontal and then transmitted to the PBS260, and then penetrates the PBS260 to the micro-display 250 , and the light reflected by the microdisplay 250 is reflected by the PBS 260 , and then forms an enlarged real image through the convex lens 270 , and is projected onto the screen 280 .

From the above, it can be seen that the present invention utilizes a good optical engine to effectively magnify the image provided by the microdisplay. The optical engine mainly uses a convex lens to magnify the image. Therefore, the number of convex lenses can be increased according to the magnification requirements; and the focusing lens and diffractive lens group are used to concentrate the light emitted by the light source, enhance the brightness, and reduce the image magnification. Often the brightness is not enough. At the same time, a polarized light separator (PBS) is used to effectively separate the light source from the light reflected by the display, and the enlarged image will not be disturbed by the background of the light source; the image quality is quite good. And according to the type of the microdisplay used, the present invention can add a color wheel as needed to cooperate with the original monochrome microdisplay, so that the original monochrome microdisplay can produce colors. In addition, the device of the present invention is only composed of micro-displays, LED or Xe bulbs, and several optical elements of lens groups, and is quite lightweight in terms of weight and volume, which quite meets the needs of today's market.

It should be noted that the above-mentioned embodiments are only examples for convenience of description, and the scope of rights claimed in the present invention should be determined by the claims, rather than limited to the above-mentioned embodiments.

Claims (20)

1. A projection display device, characterized in that it mainly comprises: a light source to provide light; A focusing lens group is located on one side of the light source to concentrate the light emitted by the light source; A diffraction lens group is located on one side of the focusing lens group, so that the focusing lens group is located between the light source and the diffraction lens group, so as to increase the half-luminance angle of the light transmitted from the focusing lens group; A display unit is located on the other side of the diffraction lens group, so that the diffraction lens group is located between the focusing lens group and the display unit, and the display unit is not located between the focusing lens group and the diffraction lens group on the straight line formed to receive the light emitted by the light source and provide an image; A polarized light separator is located in the space surrounded by the display unit and the diffractive mirror group, reflecting the light emitted by the light source to the display unit, and allowing the light emitted by the display unit to pass through; a refracting mirror group to deflect and enlarge the image provided by the display unit; in The light emitted by the light source passes through the focusing lens group to the diffractive lens group, then travels to the polarized light separator, and is reflected by the polarized light separator to the display unit, and the light provided by the display unit The light then passes through the polarized light separator, reaches the refracting mirror group, and is transformed by the refracting mirror group to form an enlarged real image. 2. The projection display device according to claim 1, wherein the light source is an LED, a car light bulb or an Xe light bulb. 3. The projection display device according to claim 1, wherein the focusing lens group is a focusing lens. 4. The projection display device according to claim 1, wherein the diffractive lens set comprises a horizontal diffractive lens and a vertical diffractive lens. 5. The projection display device according to claim 1, wherein the display unit is a micro-flat display. 6. The projection display device according to claim 1, wherein the display unit is an LCD, an LCOS microdisplay or a DMD microdisplay. 7. The projection display device according to claim 1, wherein the refracting mirror group comprises at least one convex lens. 8. The projection display device according to claim 1, wherein the refracting lens group comprises at least one convex lens and a magnifying lens. 9. The projection display device according to claim 1, wherein the display unit and the polarized light separator form an included angle X, and the value of X is between 0° and 90°. 10. The projection display device according to claim 1, wherein the polarization separator and the refraction unit form an included angle Y, and the value of Y is between 0° and 90°. 11. The projection display device according to claim 7 or 8, wherein an angle Y is formed between the polarized light separator and the axis of the convex lens, and the value of Y is between 0° and 90°. 12. The projection display device according to claim 1, further comprising a color wheel located between the light source and the focusing lens group. 13. A projection display device, characterized in that it mainly includes: a light source to provide light; A focusing lens group is located on one side of the light source to concentrate the light emitted by the light source; A diffraction lens group is located on one side of the focusing lens group, so that the focusing lens group is located between the light source and the diffraction lens group, so as to increase the half-luminance angle of the light transmitted by the focusing lens group; A display unit is located on the other side of the diffraction lens group, so that the diffraction lens group is located between the focusing lens group and the display unit, and the display unit is located between the focusing lens group and the diffraction lens group on the straight line formed to receive the light emitted by the light source and provide an image; A polarized light separator is located in the space surrounded by the display unit and the diffractive mirror group, so as to transmit the light emitted by the light source to the display unit and reflect the light emitted by the display unit; a refracting mirror group to deflect and enlarge the image provided by the display unit; in The light emitted by the light source passes through the focusing lens group to the diffractive lens group, then travels to the polarized light separator, and passes through the polarized light separator to the display unit, and is provided by the display unit The light is reflected by the polarized light separator, reaches the refracting mirror group, and is transformed by the refracting mirror group to form an enlarged real image. 14. The projection display device according to claim 13, wherein the light source is an LED, a car light bulb or an Xe light bulb. 15. The projection display device according to claim 13, wherein the display unit is a micro-flat display. 16. The projection display device according to claim 13, wherein the display unit is an LCD, an LCOS microdisplay or a DMD microdisplay. 17. The projection display device according to claim 13, wherein the refracting mirror group comprises at least one convex lens. 18. The projection display device according to claim 13, wherein the refracting lens group comprises at least one convex lens and a magnifying lens. 19. The projection display device according to claim 13, wherein the polarization separator and the refraction unit form an angle Y, and the value of Y is between 0° and 90°. 20. The projection display device as claimed in claim 13, further comprising a color wheel located between the light source and the focusing lens group.