CN104635346B - Stereoscopic naked-eye projection device and display device - Google Patents

Abstract

The present invention provides a stereoscopic naked-eye projection device and a display device, and the projection device includes a light source module, a light scanning element, a light transmission element module, a light combining element module, a spatial light modulation module and a lens. The light source module provides light. The light scanning element has an actuating device and a reflecting surface, and the actuating device is capable of deflecting the reflecting surface. The light combining element module includes a first light combining element. The spatial light modulation module includes a first spatial light modulation element. The normal vector of the light incident surface of the first light combining element is coplanar with the normal vector of the reflecting surface of the first spatial light modulation element, and the plane is perpendicular to the plane on which the projection device is set. The light will be transmitted from the light source module to the light scanning element, the light transmission element module, the light combining element module, the spatial light modulation module in sequence, and leave the projection device through the lens. The stereoscopic naked-eye projection device of the present invention has the characteristics of simple optical path design, simple control method, and reduced volume and weight.

Description

Stereo naked-view projection device and display device

technical field

The invention relates to an optical device, in particular to a three-dimensional naked-view projection device.

Background technique

In recent years, with the development of 3D display technology, various commercial applications of this technology have emerged, such as 3D movies, 3D TV and so on. Stereoscopic display technology is to transmit the left-eye image and right-eye image of different viewing angles to the left eye and right eye of the viewer in a time sequence, imitating the depth of field caused by the parallax of the human eye, and allowing the observer to watch the stereoscopic image .

In addition, it can also be divided into glasses-type, helmet-type and three-dimensional naked-vision display technologies according to whether additional equipment is required. Among them, the three-dimensional naked-eye display technology is particularly concerned by the industry because it can be viewed directly with the naked eye without special three-dimensional glasses or special helmets.

The known three-dimensional naked-eye projection device can realize the purpose of allowing the left and right eyes to watch different images by collocating multiple projection devices (which can be arranged as an array of projection devices). However, such a design will make it difficult to miniaturize the projection device, and the design of the optical path coupling each projection device will also become more complicated. Another design is to transmit images of different angles to the left and right eyes at different timings through liquid crystal switching elements. However, this design can reduce the size of the projection device. For example, if you want to provide 16 viewing angles, you must configure 4-level Two-stage liquid crystal switch, and the efficiency conversion ratio of each two-stage liquid crystal switch is about 90%, so after four liquid crystal switches, the actual conversion efficiency is only better than 65.6%, so the use of switching elements is not only complicated in control, but also the overall imaging efficiency Also worse.

In view of this, how to provide a three-dimensional naked-view projection device with simple optical path design, simple control method, better conversion efficiency, and reduced volume and weight is an urgent problem to be solved in the industry.

Contents of the invention

In view of the above problems, the main purpose of the present invention is to provide a three-dimensional naked-view projection device with simple optical path design, simple control method, better conversion efficiency, and reduced volume and weight.

To achieve the above purpose, the present invention provides a three-dimensional naked-view projection device, and the projection device includes a light source module, a light scanning element, a light transmission element module, a light combining element module, a spatial light modulation module, and a lens.

The light source module provides light. The light scanning element has an actuating device and a reflective surface, and the actuating device deflects the reflective surface. The light combining element module includes a first light combining element. The spatial light modulation module includes a first spatial light modulation element. The normal vector of the incident surface of the first light-combining element is coplanar with the normal vector of the reflecting surface of the first spatial light modulation element, and the plane is perpendicular to the plane on which the projection device is installed.

The light will be transmitted from the light source module to the light scanning element, the light transmission element module, the light combination element module, the spatial light modulation module in sequence, and leave the projection device through the lens.

In a preferred embodiment of the present invention, the light source module is a laser array or a laser unit.

In a preferred embodiment of the present invention, a uniform light element is also included, disposed between the light scanning element and the light source module. The light will be transmitted to the uniform light element and the light scanning element in sequence.

In a preferred embodiment of the present invention, the light combining element module further includes a second light combining element. The spatial light modulation module further includes a second spatial light modulation element and a third spatial light modulation element.

After the light enters the second spatial light modulation element and the third spatial light modulation element, it is transmitted to the first light combination element through the second light combination element, and the light exits through the second light combination element in the same direction.

In a preferred embodiment of the present invention, the optical scanning element can be a voice coil motor, a polygonal mirror or a micro-electromechanical mirror.

In a preferred embodiment of the present invention, the spatial light modulation element is a digital micromirror device or a liquid crystal display device.

In a preferred embodiment of the present invention, the actuating device of the light scanning element deflects the reflective surface by different angles according to different timings, so as to form a plurality of different viewing zones.

In a preferred embodiment of the present invention, the light combining element is a total reflection prism.

In a preferred embodiment of the present invention, the light transmission component module is a mirror.

The present invention can also provide a display device, which includes any one of the aforementioned projection devices and a display screen. And the projection device forms a plurality of viewing zones on the display screen.

In a preferred embodiment of the present invention, the display screen includes double-layer lenticular lenses. The double-layer lenticular lens has two lenticular lens layers and an omnidirectional diffusion plate sandwiched between the lenticular lens layers.

The beneficial effect of the present invention is that, in summary, this embodiment can transmit the light provided by the light source module to the spatial light modulation module according to different timings through the light scanning element, thereby replacing the conventionally known multi- The light source or the switching element realizes the method of generating different viewing areas at different timings, so as to provide a three-dimensional naked-view projection device with simple optical path design, simple control method, and reduced volume and weight.

Description of drawings

FIG. 1 is a schematic diagram of a first embodiment of a three-dimensional naked-view projection device of the present invention.

FIG. 2 is a schematic diagram of imaging of the three-dimensional naked-view projection device in FIG. 1 .

FIG. 3 is another schematic diagram of imaging of the three-dimensional naked-view projection device in FIG. 1 .

FIG. 4 is a schematic cross-sectional view along line AA of FIG. 1 .

FIG. 5 is another schematic diagram of imaging of the three-dimensional naked-view projection device in FIG. 1 .

FIG. 6 is a schematic diagram of a display device of the present invention.

FIG. 7A is a schematic diagram of a second embodiment of the stereoscopic naked-view projection device of the present invention.

FIG. 7B is a schematic diagram of the side of the three-dimensional naked-view projection device shown in FIG. 7A .

Wherein, the reference signs are explained as follows:

1, 1a: projection device

10: Light source module

11: Uniform light element

12: Optical scanning element

121: Actuating device

122: reflective surface

13: Optical transmission element module

14: Combined light component module

141: The first light-combining element

141A: light incident surface

142: Second light-combining element

15: Spatial light modulation module

151: the first spatial light modulation element

152: Second spatial light modulation element

153: The third spatial light modulation element

151A: reflective surface

16: Lens

2: display screen

21, 23: lenticular lens layer

22: omnidirectional diffuser

3: Display device

AA: hatching

B: Imaging range of known spatial light modulators

B': imaging range

C: area

P: Plane

V ₁ , V ₂ : normal vectors

detailed description

A three-dimensional naked-view projection device and a display device according to preferred embodiments of the present invention will be described below with reference to related drawings, wherein the same components will be described with the same reference symbols.

Meanwhile, in the following embodiments and drawings, elements not directly related to the present invention have been omitted and not shown; and the dimensional relationship among the elements in the drawings is only for easy understanding, and is not intended to limit the actual ratio.

The projection device exemplified herein may be a digital light processing (Digital Light Processing; DLP) projection display or a liquid crystal projection device (Liquid Crystal Display; LCD), or a single crystal silicon liquid crystal display (Liquid Crystal On Silicon System, LCOS System), etc. Devices with projection display capabilities.

Please refer to FIG. 1 to FIG. 5 first. FIG. 1 is a schematic diagram of a first embodiment of a stereoscopic naked-view projection device of the present invention. FIG. 2 is a schematic diagram of imaging of the three-dimensional naked-view projection device in FIG. 1 . FIG. 3 and FIG. 5 are still another imaging diagram of the three-dimensional naked-view projection device in FIG. 1 . FIG. 4 is a schematic cross-sectional view along line AA of FIG. 1 .

The projection device 1 of this embodiment at least includes a light source module 10 , a light scanning element 12 , a light transmission element module 13 , a light combining element module 14 , a spatial light modulation module 15 and a lens 16 . The light will be transmitted from the light source module 10 to the light scanning element 12 , the light transmission element module 13 , the light combination element module 14 , the spatial light modulation module 15 , and leave the projection device 1 through the lens 16 .

The light source module 10 is disposed on one side of the light scanning element 12 , and the light source module 10 can provide light. And the light source module 10 can be a laser array or a laser unit.

In addition, this embodiment may further include a uniform light element 11 , so that light can be uniformed to form a strip light source before entering the light scanning element 12 , and the light uniform element 11 may be disposed between the light scanning element 12 and the light source module 10 . The light will be transmitted to the uniform light element 11 and the light scanning element 12 in sequence. The "homogeneous element" referred to here can be an integration rod or a light tunnel.

The light scanning element 12 has an actuating device 121 and a reflective surface 122 , and the actuating device 121 deflects the reflective surface 122 . Wherein, the optical scanning element 12 of this embodiment may be formed by a voice coil motor, a polygon mirror, a micro-electro-mechanical (MEMS) lens, or a combination thereof.

Moreover, the voice coil motor in this embodiment can be a galvano mirror, and the galvano mirror can also include a movable coil (not shown) disposed on the magnetic field. And the movable coil can be rotated by the electromagnetic force generated by the magnitude of the current to drive the rotating shaft to rotate, and deflect the mirror connected to the rotating shaft. In short, if the optical scanning device 12 is a current mirror, the angle of the mirror can be adjusted by controlling the magnitude of the current of the current mirror.

In addition, the reflective surface 122 of this embodiment can be deflected at an angle of 20 degrees to -20 degrees. If it is desired to project the strip light provided by the light source module 10 into 16 strip light sources with different angles at different timings, then The reflective surface can be deflected 2.5 degrees at a time. However, it can also be divided into 32 different angles to form 32 viewing areas. In other words, the angle distribution here will be adjusted according to the number of viewing areas, not limited to the 16 described here.

As before, the actuating device 121 of the light scanning element 12 can deflect the reflective surface 122 by different angles according to different timings, so as to form a plurality of different viewing zones. The light from the light source module 10 on the X-Y coordinate plane can reach the Y-Z coordinate plane ( FIG. 2 ), scan and form an image in the Y direction.

The light transmitting element module 13 is a reflective mirror and is disposed between the light combining element module 14 and the light scanning element 12 . And the light transmission element module 13 of the present embodiment and the light scanning element 12 clamp an angle of 45 degrees, so the light is transmitted from the light scanning element 12 to the light combination element module 14 and is deflected by 90 degrees, and can be imaged on the X-Z coordinate plane (Fig. 2 ).

The light combining element module 14 may include a first light combining element 141 , and the first light combining element 141 may be a total reflection prism. The first light-combining element 141 can reflect light with an incident angle greater than a predetermined angle (for example, 40 degrees), and allow light with an incident angle smaller than the predetermined angle to pass through. Therefore, the light transmitted from the light transmission element module 13 will be reflected and transmitted to the spatial light modulation module 15 .

As can be seen from FIG. 3 , light rays can be imaged from the X-Z coordinate plane (coordinates on the right side of the drawing) of the first light combining element 141 to the X-Y coordinate plane (coordinates on the left side of the drawing), and then transmitted to the first combining element 141. Light element 141, at this time the incident angle of light will be smaller than the preset angle, so it will penetrate the first light combination element 141, and the area C drawn on the drawing is the area that enters the first light combination element 141 and can be transmitted to the projection lens Incidence area. The area C drawn here is the angle that can pass through the first light-combining element 141 (the incident angle is smaller than the preset angle), and if the image is formed outside the area C, it will be reflected (the incident angle is greater than the preset angle).

The spatial light modulation module 15 includes a first spatial light modulation element 151 . The first spatial light modulation element 151 is a digital micromirror device (digital micromirror device; DMD) or a liquid crystal display device (liquid crystal display device; LCD device).

For example, if the first spatial light modulation element 151 is a digital micromirror device, the deflection range of the digital micromirror device is 12 to -12 degrees (the dotted line B in FIG. 5 indicates that the known imaging range is within 24 degrees). Control or modulate incoming light. Here, when the DMD is turned on, the light transmitted from the first light-combining element 141 will be reflected into the first light-combining element 141 again, and enter the lens 16 to be imaged on the display screen 2 . On the contrary, if it is in the closed state, the light transmitted from the first light combining element 141 will not be imaged on the display screen.

Please refer to FIG. 4 in particular. In this embodiment, the normal vector V ₁ of the light incident surface 141A of the first light combining element 141 and the normal vector V ₂ of the reflective surface 151A of the first spatial light modulation element 151 are coplanar, and this plane and The plane P on which the projection device 1 is installed is vertical.

Furthermore, please refer to Fig. 2 and Fig. 5 together. The first light-combining element 141 and the first spatial light modulation element 151 of the device are configured at a 45-degree angle. The advantage of adopting this configuration in this embodiment is that the imaging range B of the known spatial light modulator is expanded to B' (taking DMD as an example of a spatial light modulator, the imaging angle will be extended from 24 degrees to 40 degrees), so it can be The etendue (the product of the area and the solid angle) of the overall light beam of the projection system is increased to obtain a larger amount of light and more multiple viewing areas that can be formed and imaged on the display screen 2 .

Please refer to FIG. 6 , which is a schematic diagram of a display device of the present invention.

This embodiment is a display device 3 , and the display device 3 includes the aforementioned projection device 1 and display screen 2 . Moreover, the projection device 1 can form a plurality of viewing zones on the display screen 2, so that the viewer can see adjacent viewing zones with the left and right eyes, form parallax and watch stereoscopic images.

It should be added that, for the convenience of illustration, FIG. 6 only illustrates the relative relationship between the first spatial light modulation element 151 and the lens 16 of the projection device 1, and is not an actual configuration. It is only for the convenience of understanding the relationship between the projection device 1 and the display screen 2. This drawing is done for imaging relationships.

In addition, the display screen 2 of this embodiment also includes double-layer lenticular lenses. The double lenticular lens has two lenticular lens layers 21, 23 and an omnidirectional diffuser 22 (diffuser) sandwiched between the two lenticular lens layers. In detail, the light emitted from the projection device 1 will be condensed by the lenticular lens layer 21 and imaged to the omnidirectional diffuser 22 first, and then re-imaged to the viewing plane of the user through the lenticular lens layer 23 .

Moreover, the lenticular lens layers 21 and 23 here are made of a transparent material with a high refractive index, such as ultraviolet curing resin, thermosetting resin or plastic. And the shape of the protrusions of the two lenticular lens layers 21, 23 is a circular, elliptical, triangular or square geometric shape and so on.

It is supplemented that the curvatures of the two lenticular lens layers 21, 23 and the protrusions of the omnidirectional diffuser 22 and the distances between the elements drawn on the drawing are just examples, and the projection device 1 and the display screen must be taken into consideration in practical applications. 2 distance has been adjusted.

Finally, please refer to FIGS. 7A and 7B , which are a schematic view and a side view of a second embodiment of the stereoscopic naked-view projection device of the present invention, respectively.

The difference from the single-chip projection device in the first embodiment (FIG. 1) is that the projection device 1a of this embodiment can also be a three-chip digital optical processing projection display.

The light combining element module 14 of this embodiment may further include a second light combining element 142 in addition to the first light combining element 141 . Similarly, the second light combining element 142 can be a total reflection prism.

In addition, the spatial light modulation module 15 of this embodiment may further include a second spatial light modulation element 152 and a third spatial light modulation element 153 in addition to the first spatial light modulation element 151 . Similarly, the second spatial light modulation element 152 and the third spatial light modulation element 153 can be digital micromirror devices or liquid crystal display devices.

The light provided by the light source module 10 is transmitted to the light scanning element 12 , the light transmission element module 13 , the light combining element module 14 , and the spatial light modulation module 15 in sequence, and leaves the projection device 1 through the lens 16 .

In detail, the light will be transmitted by the first light combining element 141 and the second light combining element 142 of the light combining element module 14 to the first spatial light modulation element 151 , the second spatial light modulation element 152 and the third spatial light modulation element 153 (according to the situation of coupling with the light-combining element module according to different incident angles). Next, after the light enters the first spatial light modulation element 151, the second spatial light modulation element 152 and the third spatial light modulation element 153, the light is reflected by these spatial light modulation elements 151, 152, 153 and enters the second spatial light modulation element 153 again. light-combining element 142 and transmitted to the first light-combining element 141 through the second light-combining element 142 .

In addition, the light exiting through the second light combining element 142 is in the same direction. In short, the light reflected by the first spatial light modulation element 151, the second spatial light modulation element 152 and the third spatial light modulation element 153 and entering the second light combining element 142 will enter the lens 16 in the same direction and be imaged on the Screen 2 is displayed.

The collocation relationship between the second spatial light modulation element 152 , the third spatial light modulation element 153 and other elements is similar to that of the first spatial light modulation element 151 , so details will not be repeated here.

To sum up, this embodiment can transmit the light provided by the light source module to the spatial light modulation module at different angles according to different timings through the light scanning element, thereby replacing the known method of using multiple light sources or switching elements to achieve different The practice of generating different viewing zones in time sequence provides a three-dimensional naked-view projection device with simple optical path design, simple control mode, and reduced volume and weight.

The above descriptions are illustrative only, not restrictive. Any equivalent modifications or changes made without departing from the spirit and scope of the present invention shall be included in the scope of the appended claims.

Claims (10)

1. it is a kind of three-dimensional naked regarding projection arrangement, including：

There is provided a light for one light source module；

One optical scanning element, with an actuation means and a reflecting surface, the wherein actuation means are able to deflect the reflecting surface；

One smooth transmitting element module；

One closing light component module, including：

One first closing light element；

One space optical modulator module, including：

One first spatial optical modulation element, the wherein normal vector of an incidence surface of the first closing light element are adjusted with first spatial light The normal vector copline of one reflecting surface of element processed, and the plane is vertical with the plane set by the projection arrangement；

One camera lens；And

One even optical element, is arranged between the optical scanning element and the light source module, and the light is sequentially transferred to the even light member Part and the optical scanning element；

Wherein, the light is sequentially transferred to the even optical element, the optical scanning element, the light transmitting element mould from the light source module Block, the closing light component module, the space optical modulator module, and leave the projection arrangement via the camera lens；

Wherein, the actuation means can make the different angles of the reflection deflecting facet according to different sequential, to form multiple differences The ken so that the light in X-Y coordinate plane is reached on Y-Z coordinate planes, and in Y-direction be scanned and into Picture, the light is delivered to the closing light component module from the optical scanning element and is deflected 90 degree, and it is flat to image in X-Z coordinates On face.

2. as claimed in claim 1 three-dimensional naked regarding projection arrangement, the wherein light source module is a laser array or a laser list Member.

3. it is as claimed in claim 1 three-dimensional naked regarding projection arrangement, wherein the closing light component module, in addition to one second closing light member Part, the space optical modulator module also includes a second space optical modulation element and one the 3rd spatial optical modulation element, wherein, should Light enters after the second space optical modulation element and the 3rd spatial optical modulation element, is transmitted by the second closing light element To the first closing light element, and the light left by the second closing light element is equidirectional.

4. as claimed in claim 1 three-dimensional naked regarding projection arrangement, the wherein optical scanning element is voice coil motor, polygonal mirror or micro- Electromechanical eyeglass.

5. three-dimensional naked regarding projection arrangement as described in claim 1 or 3, the wherein spatial optical modulation element is that a digital micro-mirror is filled Put or a liquid crystal display device.

6. the three-dimensional naked actuation means foundation difference for regarding projection arrangement, wherein the optical scanning element as claimed in claim 1 Sequential makes the different angles of the reflection deflecting facet, to form multiple different kens.

7. three-dimensional naked regarding projection arrangement as described in claim 1 or 3, the wherein closing light element is a total reflection prism.

8. as claimed in claim 1 three-dimensional naked regarding projection arrangement, the wherein light transmitting element module is a speculum.

9. a kind of display device, including：

It is three-dimensional naked regarding projection arrangement as described in claim 1 to 8 is any；And

One display screen；

Wherein, the solid it is naked depending on projection arrangement in forming multiple kens on the display screen.

10. display device as claimed in claim 9, the wherein display screen include pair of lamina lens pillar, the two-layer columnar Lens are sandwiched in the omni-directional diffusion plate between described two lens pillars layers with two lens pillars layer and one.