CN100559261C - Projector with a light source - Google Patents

Abstract

A projector with interchangeable lens and light absorber has broken through the strict limitation of relative relationship between optical elements in the traditional projector to greatly increase the freedom degree of the projector in designing the light path. The projector includes a processor, an illumination system, a digital micromirror device, and a lens. The processor converts the plurality of pixel data into a plurality of complementary pixel data and generates a plurality of corresponding micromirror control signals. The illumination system is used for guiding light. The digital micromirror assembly receives and reflects light and comprises a plurality of lenses, the lenses are arranged in a first direction or a second direction according to the micromirror control signals, when the lenses are arranged in the first direction, the lenses reflect the light to be close to the illumination system, and when the lenses are arranged in the second direction, the lenses reflect the light to be far away from the illumination system. The lens receives the light reflected by the lens in the second direction and projects the light to the screen, so that an image is displayed.

Description

Projector

technical field

The present invention relates to a projector, and in particular to a projector with interchangeable positions of lens and light absorber.

Background technique

FIG. 1A is a schematic diagram of the optical path of the lenses of the digital micromirror assembly in a conventional projector when they are in a second state. The light emitted by the bulb 12 is focused on the color separation wheel (not shown) through the lampshade, and the three primary colors generated are converged on the illuminated optics 14 . Generally speaking, the illumination system 14 includes a uniform light tube, a condenser lens group, a reflector, a concave mirror, etc., and its function is to uniformly irradiate light to a digital micromirror device (Digital Micromirror Device, DMD) 6 . The DMD 6 includes several lenses 16a. Each lens can be rotated to switch to the first state or the second state. When the lens 16a is in the second state, it will reflect light away from the lighting system 14 to a light absorber 18 .

FIG. 1B is a schematic diagram of the optical path of the lens of the digital micromirror assembly in the traditional projector when it is in the first state. When the lens 16 b is in the first state, the reflected light approaches the illumination system 14 and enters the lens 8 , thereby projecting an image on the screen 22 through the projection lens 8 .

However, the digital micromirror assembly 6 rotates the direction of the mirror according to the control signal, and the mirror can only be rotated to the first state or the second state, and the direction cannot be changed arbitrarily. Therefore, in a traditional projector, the light absorber 18 can only be arranged on the extension line of the reflected light of the lens in the second state. At the same time, the lens 8 can only be arranged in the direction of the light reflected by the lens in the first state, as shown in FIG. 1A and FIG. 1B . Because of this, the lens and light absorber used to receive the reflected light must be placed in a specific position, and the components used to generate the incident light, such as light sources, optical components, etc., are indirectly affected by their placement position and angle. limit. Furthermore, the relative relationship between the optical components of the traditional projector is extremely restricted, which greatly reduces the degree of freedom of the projector in optical path design. At the same time, it is difficult to make a breakthrough because it indirectly restricts the exterior design of traditional projectors.

Contents of the invention

In view of this, the object of the present invention is to provide a projector and a display method thereof, which uses a processor to convert the pixel data of the image into complementary pixel data, so that the complementary pixel data displays the color displayed by the corresponding pixel data. remaining color. And by changing the configuration positions of the lens and the light absorption area to match the complementary pixel data, and then display the color of the pixel data of the original image, the optical path design and appearance of the projector can be changed.

According to the purpose of the present invention, a projector including a processor, an illumination system, a digital micromirror assembly and a lens is proposed. The processor converts several pieces of pixel data into several pieces of complementary pixel data, and generates corresponding several micromirror control signals, each piece of pixel data is used to display colors, and each piece of complementary pixel data is used to display corresponding pixel data The remaining color of the color. The lighting system is used to guide the light. The digital micromirror device (Digital Micromirror Device, DMD) receives and reflects light. The digital micromirror device includes several lenses. These lenses are set in the first direction or the second direction according to the micromirror control signals. When the lenses are set When in the first direction, the mirrors reflect the light to approach the lighting system, and when the mirrors are arranged in the second direction, the mirrors reflect the light away from the lighting system. The lens receives the light reflected by the mirror in the second direction, and projects the light to the screen, thereby displaying images.

In order to make the above-mentioned purposes, features, and advantages of the present invention more comprehensible, a preferred embodiment is specifically cited below, together with the accompanying drawings, as follows:

Description of drawings

FIG. 1A is a schematic diagram of an optical path of a lens of a digital micromirror assembly in a conventional projector when it is in a second direction.

FIG. 1B is a schematic diagram of the optical path when the lens of the digital micromirror assembly in the traditional projector is in the first direction.

Figure 2 shows a block diagram of the projector of the preferred embodiment of the present invention.

FIG. 3A is a schematic diagram of an optical path of a lens of the projector in FIG. 2 in a first direction.

FIG. 3B is a schematic diagram of an optical path of a lens of the projector in FIG. 2 in a second direction.

Explanation of main component symbols

6: Digital Micromirror Assembly

8: Lens

10: Projector

12: light source

14: Lighting system

16a, 16b: lens

18: light absorber

22: screen

100: Projector

102: Processor

106: Digital Micromirror Assembly

108: Lens

112: light source

114: Lighting system

116, 116a, 116b: lenses

118: light absorber

120: computer

122: screen

Detailed ways

Please refer to FIG. 2 , which shows a block diagram of a projector according to a preferred embodiment of the present invention. The projector 100 of this embodiment includes a processor 102 , a DMD 106 , a lens 108 and a light absorber 118 . And the projector 100 is preferably connected with the computer 120 , so that the computer 120 can transmit several pieces of pixel data to the processor 102 of the projector 100 . The processor 102 generates several pieces of complementary pixel data according to the pixel data. Each piece of pixel data is used to display a color, such as red, green or blue. Each piece of complementary pixel data is used to display the remaining color of the corresponding pixel data, such as cyan (Cyan), magenta (Magenta) or yellow, which are optically complementary to red, green and blue respectively.

The processor 102 generates several micromirror control signals according to the complementary pixel data. The DMD 106 receives the micromirror control signals, and switches the states of the mirrors 116 of the DMD 106 accordingly.

The projector 100 also includes a light source 112 and an illumination system 114 . The light source 112 generates a light, which is focused on the color separation wheel (not shown) through the lampshade, and the three primary colors generated are converged on the illuminated optics 114 . In order to make the illustration simple and clear, only one lens is shown here to represent the illumination system 114 . In general, the illumination system 114 includes a uniform light tube, a condenser lens group, a reflector, a concave mirror, etc., and its function is to uniformly irradiate the light on the digital micromirror device (Digital Micromirror Device, DMD) 106 .

The digital micromirror assembly 106 is controlled by the micromirror control signal output by the processor 102 , so that the plurality of mirrors 116 are respectively switched to a first direction or a second direction to reflect light to the lens 108 or the light absorber 118 .

Please refer to FIG. 3A , which shows a schematic view of the optical path of the lens of the projector shown in FIG. 2 in the first direction. When the lens 116 b is in the first direction, the reflected light from the illumination system 114 approaches the light absorber 118 , and the light cannot pass through the lens 108 and project onto the screen 122 . The light absorber 118 receives light reflected by the lens 116 b in the first direction, and the light absorber 118 is made of non-reflective material.

Please refer to FIG. 3B , which shows a schematic diagram of an optical path of a lens of the projector shown in FIG. 2 in the second direction. When the lens 116a is in the second orientation, the light of the reflected lighting system 114 is away from the lighting system 114 to the lens 108 . The lens 108 receives the light reflected by the lens 116 a in the second direction, and projects the light to the screen 122 accordingly, thereby displaying an image.

Please refer to FIG. 2, for example, when the pixel data received by the processor 102 represents that the color to be displayed is black, the processor 102 generates a complementary pixel data, and the complementary pixel data represents that the color to be displayed is white . The processor 102 generates a micromirror control signal to switch the corresponding lens 116 to the first direction according to the complementary pixel data, so that the light projected on the lens 116 is reflected to the light absorber 118, so that the lens 108 presents the pixel data. Corresponding black color.

It should be noted that since the pixel data in this embodiment undergoes secondary conversion, the image corresponding to the original pixel data can be displayed correctly. The pixel data is converted into complementary pixel data by the processor, which is the first conversion. Compared with the traditional projector, the positions of the lens and the light absorber in this embodiment are exchanged, which is the second conversion. When the lens is positioned in the first direction, the light originally reflected to the lens is reflected to the light absorber in this embodiment. When the lens is positioned in the second direction, the light originally reflected to the light absorber is reflected to the lens in this embodiment.

The projector disclosed in this embodiment converts the pixel data into complementary pixel data, and exchanges the positions of the lens and the light absorber, so that the lens and the light absorber do not have to be limited by the design of the digital micromirror assembly. A specific location can increase the variability of the appearance design; secondly, increasing the distance between the lens and other components (such as light sources, optical components in the lighting system, etc.) can increase the freedom of optical path design and component configuration. Therefore, the optical path design of the projector disclosed in this embodiment can be changed, so that the appearance of the projector can be changed more, which is in line with the current trend of seeking innovation and change in the appearance of electronic products.

In summary, although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person in the industry may make various modifications and changes without departing from the spirit and scope of the present invention. modification, so the scope of protection of the present invention should be defined by the claims.

Claims (6)

1. A projector, characterized in that the projector at least includes: A processor converts multiple pieces of pixel data into multiple pieces of complementary pixel data, and generates corresponding multiple micromirror control signals, each piece of pixel data is used to display a color, and each of these complementary pixel data A residual color for displaying the color corresponding to the pixel data; a lighting system for guiding a light; A digital micromirror assembly receives and reflects the light. The digital micromirror assembly includes a plurality of mirrors, and the mirrors are arranged in a first direction or a second direction according to the micromirror control signals. In the first direction, the mirrors reflect the light to approach the lighting system, and when the mirrors are arranged in the second direction, the mirrors reflect the light away from the lighting system; and A lens receives the light reflected by the lens in the second direction, and projects the light to a screen, thereby displaying an image. 2. The projector according to claim 1, wherein the color displayed by the pixel data is red, green or blue. 3. The projector according to claim 2, wherein the remaining colors displayed by the complementary pixel data are cyan, magenta or yellow, which are optically complementary to red, green and blue respectively. 4. The projector according to claim 1, wherein the pixel data is output by a computer, and the computer is connected to the projector for transmitting the pixel data. 5. The projector of claim 1, further comprising: A light absorber receives the light reflected by the mirror in the first direction. 6. The projector according to claim 5, wherein the light absorber is made of non-reflective material.

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