CN105045019B - A kind of DLP polarized stereo projection device - Google Patents

Abstract

A digital light projection (DLP) polarized three-dimensional projection (3D) device comprises a white light source, a beam shaping system, digital micromirror device (DMD) chips, a projection lens, a light split/combination prism group and a driving signal control unit, wherein the light split/combination prism group is used for splitting white light emitted from a light source into red primary light, green primary light and blue primary light which are incident onto respective corresponding DMD chips for modulation; the top of each micro lens in the DMD chips is provided with a selective reflection surface for selective reflection of P light and S light, two sub pixels contained in a pixel are used for respectively giving out the P light and the S light, the P light and the S light which are reflected by the DMD chips corresponding to the three red, blue and green primary lights are modulated to form a left-eye image and a right-eye image by the driving signal control unit, and a looker can watch a 3D image by wearing adaptive polarized 3D glasses. Compared with the ordinary polarized 3D projection, the DLP polarized 3D device has the advantages of low cost and small volume, a projector is saved, and a good practical effect can be obtained in the occasion of no need of very high resolution.

Description

A kind of DLP polarized stereo projection device

technical field

The present invention relates to the field of projection display technology, in particular to a polarized stereoscopic (3D) projection device using digital light processing (DLP, Digital Light Processing) projection technology, which can watch 3D images with polarized 3D glasses.

Background technique

Polarized 3D is the most widely used stereoscopic display technology at present. It uses the principle that light has different polarization directions to decompose the original image. First, the image is divided into two groups of vertically polarized light and horizontally polarized light, and then the audience wears left and right lenses respectively. 3D glasses using polarizers with different polarization directions, so that the left and right eyes of a person can receive two sets of different images, and then synthesize a three-dimensional image through the brain.

The current polarized 3D projection display for non-home use uses one projector to form a left-eye image with P light, and another projection device to use S light to form a right-eye image, but this requires the use of two projectors, resulting in more expensive costs.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a novel polarized stereoscopic projection device combined with DLP projection technology.

In order to solve the problems of the technologies described above, the technical solution of the present invention is:

A DLP polarized stereoscopic projection device, comprising a light source system, a DMD chip, a projection lens, a light combination unit and a drive signal control unit, the light source system outputs primary color light separated by color, and the DMD chip corresponds to each primary color one by one, each The primary color light is respectively incident on the corresponding DMD chip; each pixel of the DMD chip is composed of two sub-pixels, which are respectively the first polarization state sub-pixel and the second polarization state sub-pixel; each sub-pixel is independently driven by a switch The micro-mirror is hinged on the silicon substrate; the top of the micro-mirror is a selective reflection surface, and the bottom is a hinge connected to the silicon substrate; the driving signal control unit controls the micro-mirror in each sub-pixel to take the hinge as the axis Rotate to realize switch switching; when it is in the on state, the micro-mirror of the first polarization sub-pixel reflects all the incident primary color light into linearly polarized light with the first polarization direction and emits to the light combining unit, the second The micro-mirror of the polarization state sub-pixel reflects all the incident primary color light into linearly polarized light with a second polarization direction and emits it to the light combining unit, wherein the first polarization direction and the second polarization direction are perpendicular to each other; The signal control unit controls the micro-mirrors in each DMD chip to modulate the incident primary color light according to the display image information, and the light combining unit combines the modulated and reflected primary color light into a bundle of modulated light, and the modulated light has the light with the first polarization direction The left-eye image is formed, and the light with the second polarization direction forms the left-eye image; the modulated light is projected on the screen through the projection lens.

Preferably, the screen is a metal screen, which can prevent the polarization degree of the modulated light incident on it from being damaged.

Preferably, the light source system outputs three primary colors of light, which are red light, green light and blue light respectively, corresponding to the red light DMD chip, the green light DMD chip and the blue light DMD chip respectively. At this time, the projection device is a three DMD system.

Further preferably, the light source system includes a white light source, a beam shaping system, and a light splitting unit. The white light emitted by the white light source passes through the beam shaping system and then enters the light splitting unit. The light splitting unit divides the incident white light into red light and green light. and blue light and respectively output to the corresponding DMD chip.

More preferably, the white light emitted by the white light source is naturally polarized light or circularly polarized light, which includes multiple colors of light, and can be decomposed into linearly polarized light with multiple polarization directions. The light source has wide versatility.

More preferably, the light splitting unit and the light combining unit are a combined light splitting/combining prism group, and a group of prisms with a specific shape and combination can realize the functions of light splitting and light combining at the same time, making the device more compact.

For the above solution, preferably, the light source system further includes a reflector, and the white light emitted by the beam shaping system is reflected by the reflector into the light splitting/combining prism group.

Preferably, in all the above technical solutions, the incident planes of the primary color lights are all parallel, the selective reflection surface in the first polarization sub-pixel reflects P light, and the selective reflection surface in the second polarization sub-pixel reflects S light; All the P lights in the modulated light form the left-eye image, and all the S-lights form the right-eye image.

The technical scheme of the present invention is provided with a selective reflection surface for selective reflection of P light and S light on the top of each microlens in its core component DMD chip, and two sub-pixels contained in one pixel of the DMD chip only emit P light and S light respectively. light, and the P light and S light reflected by the DMD chip corresponding to the red, green and blue three primary colors are modulated by the driving signal control unit to form a left eye image and a right eye image. The viewer wears the left and right lenses to allow only the P light and The polarized 3D glasses through which the S light passes, the left eye image and the right eye image can be received by the left eye and the right eye image respectively, thereby forming a stereoscopic image.

Because ordinary polarized 3D projection needs to configure a projector for P light and S light whose polarizations are perpendicular to each other, the technical solution of the present invention can save a projector, so the present invention has the advantages of low cost and small volume. Although the resolution is reduced due to the design of multiple sub-pixels, it can achieve good practical results when extremely high resolution is not required.

Description of drawings

Fig. 1 is the structure schematic diagram of DLP polarizing type three-dimensional projection device of the present invention;

Fig. 2 is a schematic diagram of a DMD chip pixel structure;

FIG. 3 is a schematic diagram of the structure of a sub-pixel micro-reflector of a DMD chip.

in:

1-1: white light source; 1-2: beam shaping system; 1-3: mirror; 2: DMD chip; 2R: red light DMD chip; 2G: green light DMD chip; 2B: blue light DMD chip; P: pixel ;P1: sub-pixel of the first polarization state; P2: sub-pixel of the second polarization state; M: micro-mirror; M1: selective reflection surface; M2: hinge; B: silicon substrate; 4: projection lens; L1: source light; L2: modulated light; L21: P light; L22: S light.

detailed description

The present invention will be further described through the embodiments below in conjunction with the accompanying drawings, so as to better understand the present invention.

FIG. 1 shows a DLP stereoscopic projection device corresponding to the three DMD structures in this embodiment. Among them, the light source light L1 emitted by the white light source 1-1 is white light, which is naturally polarized light or circularly polarized light; the light source light L1 is incident on the light splitting/combining prism through a reflector 1-3 after passing through the beam shaping system 1-2 Group 3, the white light is divided into red light, green light and blue light, which are respectively incident on the red DMD chip 2R, the green DMD chip 2G and the blue DMD chip 2B, and the incident surfaces of the three colors of light are all parallel to each other; among them, the structure of the DMD chip is as follows :

FIG. 2 and FIG. 3 show the basic structure of the DMD chip 2 and the structure of the micromirror M in the pixel P in this embodiment. As shown in Figure 2, the DMD chip 2 is composed of pixels P arranged regularly, and each pixel P contains two sub-pixels, which are respectively the first polarization state sub-pixel P1 and the second polarization state sub-pixel P2; as shown in Figure 3, the two sub-pixels consist of The micromirror M is hinged on the silicon substrate B through the hinge M2 at the bottom, and the top of the micromirror M is a selective reflection surface M1, and the selective reflection surface in the sub-pixel P1 of the first polarization state only reflects P light, and the first polarization state sub-pixel P1 only reflects P light. The selective reflection surface in the two-polarization sub-pixel P2 only reflects S light;

The drive signal control unit (not shown in the figure) can control the micro-mirror M in each sub-pixel to rotate to different angles around the hinge M2 to realize switching; as shown in FIG. 3 , the first polarization state sub-pixel The micromirror M to which P1 belongs is at an open angle, and the incident light source light L1 is reflected by the selective reflection surface M1 as P light L21, and the outgoing light enters the splitting/combining prism group 3 to be combined into the modulated light L2; and the second polarization The micromirror M to which the sub-pixel P2 belongs is at a closed angle, and the incident light source light L1 is reflected by the selective reflection surface M1 as S light L22, but the reflected S light is not combined into the modulated light L2, but is captured by the projection device absorb.

As shown in Figure 1, the drive signal control unit (not shown in the figure) divides the image into left-eye image and right-eye image according to the stereoscopic image to be displayed and processes it as a switch signal of the micromirror, and the drive signal control unit controls The first polarization sub-pixel P1 executes the left-eye image display signal, while the second polarization sub-pixel P2 executes the right-eye image display signal, and the micro-mirror M in each DMD chip performs switching action according to the display signal to control the incident three primary colors. The light is modulated separately, and the modulated primary color light is reflected back to the light splitting/combining prism group 3 and combined into a beam of modulated light L2; in the modulated light L2, the P light from all first polarization sub-pixels P1 contains the left eye image The display picture information of the S light from all the second polarization sub-pixels P2 contains the display picture information of the right eye image, and the modulated light L2 is projected onto the display screen through the projection lens 4, and the screen adopts a metal screen; it is reflected by the screen , the viewer can see the stereoscopic image synthesized by the left and right eye images by wearing suitable polarized 3D glasses.

It should be understood that the above-mentioned embodiments are only for illustrating the technical conception and characteristics of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and are not exhaustive of the specific implementation modes, and cannot limit the present invention thereby scope of protection. Any modification or equivalent replacement according to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (8)

1. a kind of dlp polarization type stereo projection apparatus, including light-source system, dmd chip, projection lens (4), closing light unit and drive Dynamic signaling control unit it is characterised in that:

Described light-source system output is corresponded with each primary colours by the primary lights of color separated, dmd chip, and each primary lights enter respectively It is incident upon on corresponding dmd chip；

Each pixel (p) of described dmd chip is become by two sub-pixel groups, the respectively first polarization state sub-pixel (p1) and Two polarization state sub-pixels (p2)；Each sub-pixel is by the micro-reflector (m) of independent driving switch being hinged on the upper structure of silicon substrate (b) Become；Described micro-reflector (m) top is selective reflecting face (m1), and bottom is the hinge (m2) connecting silicon substrate (b)；

Described drive signal control unit controls the micro-reflector (m) in each sub-pixel to rotate to realize out with hinge (m2) for axle Close switching；When being in opening, the selective reflecting face (m1) of the interior micro-reflector (m) of the first polarization state sub-pixel (p1) will Incident primary lights are all reflected into the linearly polarized light with the first polarization direction and outgoing is to described closing light unit, the second polarization Incident primary lights are all reflected into the linearly polarized light with the second polarization direction simultaneously by the micro-reflector (m) of state sub-pixel (p2) To described closing light unit, wherein said first polarization direction and the second polarization direction are mutually perpendicular to for outgoing；Drive signal controls single Unit controls the micro-reflector (m) in each dmd chip according to display image information, incident primary lights to be modulated, closing light unit The primary lights of modulated reflection are combined into a branch of modulation light, the light in modulation light with the first polarization direction constitutes left eye figure Picture, the light with the second polarization direction constitutes left-eye image；

Modulation light is incident upon on screen by projection lens (4).

2. dlp polarization type stereo projection apparatus according to claim 1 it is characterised in that: described screen be metal screen.

3. dlp polarization type stereo projection apparatus according to claim 1 it is characterised in that: described light-source system output three Primary lights, respectively ruddiness, green glow and blue light, correspond to ruddiness dmd chip (2r), green glow dmd chip (2g) and blue light dmd respectively Chip (2b).

4. dlp polarization type stereo projection apparatus according to claim 3 it is characterised in that: described light-source system includes white Radiant (1-1), beam shaping system (1-2) and spectrophotometric unit, the white light of described white light source (1-1) outgoing is whole through light beam Shape system (1-2) incident spectrophotometric unit afterwards, incident white light is divided into ruddiness, green glow and blue light and goes out respectively by described spectrophotometric unit It is incident upon on corresponding dmd chip.

5. dlp polarization type stereo projection apparatus according to claim 4 it is characterised in that: described white light source (1-1) goes out The white light penetrated is nature polarised light or circularly polarized light.

6. dlp polarization type stereo projection apparatus according to claim 4 it is characterised in that: described spectrophotometric unit and closing light Unit is the separation/combination prism group (3) of unification.

7. dlp polarization type stereo projection apparatus according to claim 6 it is characterised in that: described light-source system also includes Speculum (1-3), the white light of beam shaping system (1-2) outgoing reflects into described separation/combination rib through described speculum (1-3) Microscope group (3).

8. the dlp polarization type stereo projection apparatus according to any one of claim 1 to 7 it is characterised in that: described each primary colours The plane of incidence of light is all parallel, the selective reflecting face reflection p light in the first polarization state sub-pixel (p1), the sub- picture of the second polarization state Selective reflecting face reflection s light in plain (p2)；In modulation light, all p light constitute left-eye image, and all s light constitute right eye figure Picture.