CN103984109A - 3D display system - Google Patents

Abstract

The invention discloses a 3D display system, which comprises a display 1, a display 2, a half mirror and polarized 3D glasses; the polarized light emitted by the display 1 and the display 2 is in the same direction, the backlight sources of the display 1 and the display 2 are LED light sources or CCFL light sources, and the panels of the display 1 and the display 2 are TN type panels; the display 1 and the display 2 are arranged on the same plane in an included angle a of more than or equal to 70 degrees and less than or equal to 110 degrees; the half mirror is placed on an angular bisector of the included angle, and the polarized 3D glasses are placed behind the half mirror and located right in front of the display 1 or the display 2. The 3D display system of the invention can watch fine images in a close range. Because the images output by the two displays have no loss of pixel points and are continuous images, the picture is clear and fine. The 3D display system can be directly realized by adopting the conventional equipment, and the watching effect is good without increasing the watching cost.

Description

A 3D display system

the

technical field

The present invention relates to the field of 3D display, and more specifically, to a 3D display system.

Background technique

Today, 3D technology has been widely used in all walks of life. In life, people can experience the effects of 3D technology in various ways. There are also various implementation methods. There is polarized light 3D, there is 120Hz active shutter 3D and so on. The current technology used in 3D movies is to use two lenses placed according to the positions of the human eyes to shoot dual-viewpoint images of the scene, and then to project the two images synchronously through two projectors. The polarizer uses polarization extinction technology so that the left eye only receives the image of the left camera, and the right eye only receives the image of the right camera, forming a parallax to achieve a 3D effect.

Now cinemas use the method of simultaneously projecting polarized light in two directions perpendicular to a screen, and the audience wears glasses to watch it. As a big scene, this is the best technology at present, the effect is realistic, and because of the long distance, it is very clear to the human eye; however, the equipment in the cinema cannot be used at home. Then there is nVIDIA's active shutter 3D, which displays the images of the left and right eyes separately through the computer monitor at 120Hz, and the eyes of the left and right eyes can be synchronized to achieve a 3D effect. This is the most portable solution for home use, but it has obvious disadvantages. First, the output of the computer’s display screen is delayed, so it is impossible to switch a picture every 1/120 seconds, resulting in the synchronization of the eyes. It's discounted, and the constant flickering in front of the eyes is not good for the eyes.

Furthermore, the current mainstream 3D TV uses an interlaced scanning technology. That is, each row of pixels outputs light with the same polarization direction, the next row outputs light with a polarization direction perpendicular to it, and the next row turns the polarization direction back. This technology does not flicker, but the vertical pixels of the image received by the left and right eyes are reduced by half, and the image is not clear. But as a TV, it doesn't matter much if you watch it from a certain distance (such as 3 meters). However, the cost of manufacturing such a screen is very high, and the accuracy is difficult to guarantee. Then there are some low-quality 3D technologies, such as red and blue 3D, through two kinds of filters to choose, the light entering the left and right eyes will completely change the color.

Contents of the invention

In order to overcome the shortcomings of the existing 3D technology, the present invention proposes a 3D display system suitable for small places such as homes. The system can produce delicate 3D display effects with low cost.

In order to achieve the above object, the technical solution of the present invention is:

A 3D display system, including a display 1, a display 2, a half mirror and polarized 3D glasses; wherein the polarized light emitted by the display 1 and the display 2 is in the same direction, and the backlight of the display 1 and the display 2 is an LED light source or CCFL (Cold-cathode fluorescent tube) light source, the panels of display 1 and display 2 are TN-type panels (twisted nematic panels);

As long as the viewing angle is not affected, the display 1 and the display 2 are placed on the same plane at an angle a, 70°≤a≤110°; the half mirror is placed on the angle bisector of the included angle, and the polarized 3D glasses are placed behind the half mirror. And it is located directly in front of the display 1 or display 2.

Existing displays using TN panels are strictly 45° polarized light, and the purity of polarized light is very high. After testing, when the analyzer is perpendicular to the polarization direction, the effect of seeing the screen is almost completely black. Therefore, there is no need to add a linear polarizing film to the display, and what comes out is ready-made linear polarized light, and the polarization direction is highly consistent. This has a very big advantage, that is, the polarization direction of the light of one of the displays after reflection is a mirror image change. The observer wears polarized 3D glasses and looks at one of the displays behind the half mirror; at this time, the virtual image of the other display coincides with the display observed by the user. Let the two monitors display the images of the left eye and the right eye synchronously, and let the observer's left eye and right eye receive the respective images after passing through the polarizer of the polarized 3D glasses; thus, the user observes 3D images with parallax.

Preferably, the angle formed by the display 1 and the display 2 is 90°.

Preferably, the ratio of the transmitted light intensity T to the reflected light intensity R of the half mirror is 5:5, that is, T/R=5:5. The thickness of the half-mirror should be as thin as possible while maintaining the TR ratio, so as to avoid the influence of double reflections on the front and rear sides of the half-mirror.

Preferably, the half mirror is colorless glass.

If two hosts are used to output to display 1 and display 2 respectively, it is difficult to achieve synchronous output of images. In order to make the 3D effect better, it is best to ensure that the output values of display 1 and display 2 are synchronized. Then display 1 and display 2 Display 2 is controlled by a host computer.

The polarization direction of one lens in the polarized 3D glasses is 45°, and the polarization direction of the other lens is 135°. At least it doesn't matter whether the polarization direction of the left lens is 45° or the polarization direction of the right lens is 45°, because the output of the host can be changed according to the left and right sides of the glasses.

Compared with the prior art, the beneficial effect of the present invention is that the 3D display system of the present invention can watch detailed images at a close distance. Because the images output by the two monitors do not lose pixels, they are also continuous images, and the images are clear and detailed. The 3D display system of the present invention can be realized directly by using existing conventional equipment, and while achieving a good viewing effect, there is no need to increase viewing costs.

Description of drawings

Fig. 1 is a schematic diagram of the optical path of the present invention.

Figure 2(a) is a schematic diagram of the screen visible to the right eye and invisible to the left eye.

Figure 2(b) is a schematic diagram of the effect that the right eye can see the screen, and the left eye can see the image in the mirror but not the screen.

Figure 3(a) is a schematic diagram of the effect of the screen visible to the right eye and the image in the mirror visible to the left eye.

Figure 3(b) is a schematic diagram of the effect that the right eye can see the screen but not the image in the mirror, and the left eye can see the image in the mirror.

Fig. 4 is a view observed by left and right eyes when a static image is input.

FIG. 5 is a schematic diagram of images displayed on the monitor 1 and the monitor 2 when a static image is input.

Fig. 6 is an effect diagram displayed when a dynamic image is input.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings, but the embodiments of the present invention are not limited thereto.

As shown in Fig. 1, a kind of 3D display system includes LED display 1, LED display 2, half mirror and polarized 3D glasses; wherein the polarized light emitted by LED display 1 and LED display 2 is in the same direction, LED display 1 and LED The backlight of the display 2 is an LED light source, and the panels of the LED display 1 and the LED display 2 are TN-type panels (twisted nematic panels); in this embodiment, the display 1 and the display 2 are two notebook computers.

The display 1 and the display 2 are placed on the same plane at an angle of 90°; the half mirror is placed on the bisector of the included angle, and the polarized 3D glasses are placed behind the half mirror and directly in front of the display 1.

Since the LED displays 1 and 2 emit polarized light in the same direction, and after the light emitted by the display 2 passes through the intermediate half mirror, the polarization direction changes by exactly 90°, which is perpendicular to the polarization direction of the light emitted by the display 1. The two displays show the images required by the left eye and the right eye respectively. In this way, the observer can observe the 3D effect by wearing polarized 3D glasses with corresponding polarization directions, so that the left eye only receives the light reflected by the display 2 through the half mirror, and the right eye only accepts the light transmitted by the display 1 through the half mirror.

In Figure 1, the polarization direction of the 45° polarized light emitted by the LED display 2 becomes 135° after reflection, which is symmetrical to the vertical axis, and 135° is exactly perpendicular to 45°, that is, the polarization direction of the light emitted by the LED display 1 Direction is vertical. In this way, the polarization directions of the polarizers of the left and right eyes are 135° and 45° respectively, so that the left eye can only see the image of LED display 1, and the right eye can only see the image of LED display 2. Another great advantage of this is that there is no need to distinguish between the left-eye screen and the right-eye screen during the production process; all of them can be produced according to the polarization angle of 45°.

The half-mirror of the present embodiment is a key component, and just because of utilizing this half-mirror, the viewer can see the images sent by the two displays at the position of the LED display 1 at the same time. Adjustment is also very convenient.

In actual use, in fact, the two monitors do not have to be strictly placed at an angle of 90°. As long as the viewing angle is not affected, the error is within 20°. It is also very simple to place the half mirror on the angle bisector. After placing the display, first visually observe the position of the half-reflector, roughly placed on the angle bisector, then put on glasses at the observation position, first open the right eye to see the position of LED display 1, then open the left eye to see the LED Whether the border of the display 2 overlaps with the LED display 1 is enough. In this way, the display device in the 3D system can be produced as an independent display device. After fixing, the position of the virtual image will not change with the change of the viewing angle. Any angle will do. Regarding the half mirror, the ideal parameter is T/R=5:5 (transmitted light intensity/reflected light intensity). For a 14-inch screen, the length is 400mm and the width is 250mm. The thickness should be as thin as possible while ensuring the TR ratio, so as to avoid the influence of reflection ghosting on the front and rear surfaces; it is best to use colorless glass for the half mirror.

Polarized 3D glasses can use the most common polarized 3D glasses; the polarization directions are 45° and 135° respectively. It doesn't really matter if it's left or right, because the output of the computer can be set according to the left and right of the glasses. With the current technology, the cost of better quality polarized glasses with this kind of precision is only a few dollars. The effect is shown in Figure 2 and Figure 3. The picture shows an ordinary laptop computer with an ordinary mirror placed vertically to the left of the screen. The polarization direction of the light emitted by the display is 45°, and the polarization direction of the light emitted by the image in the mirror is 135°. In the figure, the polarization direction of the right lens of the 3D glasses is 45°, and the polarization direction of the left lens is 135°. Then, because the linearly polarized light cannot pass through the polarizer whose polarization direction is perpendicular to it, it can be observed through the two lenses respectively. The image in the monitor and the mirror will have different effects. Due to the shooting angle, the real effect cannot be well reflected. The actual observation effect is that only the actual computer screen can be seen through the right eye lens, while the computer screen in the mirror is black; through the left eye lens, only the actual computer screen can be seen. to the computer screen in the mirror, while the actual computer screen is black.

When viewing a video signal, the video signal is divided into still images and moving images.

When it is a static image, the principle is very simple, because the images of the left and right monitors enter the left and right eyes respectively. So let the left monitor show what you see with your left eye, and the right monitor show what you see with your right eye. However, it should be noted that since the image on the left display is upside down, it is necessary to let the left display display a horizontally flipped image. If there is a ready-made 3D photo, let the LED display 2 display the image for the right eye, and allow the LED display 1 to display the image for the left eye flipped horizontally. It is also very simple to make by yourself, aim at an object, use the camera as one of your eyes, take a picture of him from the left, then move to the right with such a long distance between the two eyes, take another picture, and let LED display 2 shows the image taken from the right, and it is sufficient to allow LED display 1 to display the image taken on the left side flipped horizontally. Figures 4 and 5 are a group of pictures taken and processed by myself, in which Figure 4 (a) "left eye image" and Figure 4 (b) "right eye image" were taken in the above-mentioned way, and Figure 5 (a) " The image of LED display 1" is obtained by flipping left and right of the "left eye image", and the "image of LED display 2" in Figure 5(b) is the "right eye image".

When it is a moving image, that is, a video, a game. The difficulty of this realization mainly lies in how to synchronize the images displayed by the two computers. For the case of one host and two monitors, there is no problem, just output directly. But for the case of two separate laptops, more complicated processing is required.

3D film sources are ready-made, including the images required by the left and right eyes, and large-scale 3D stereoscopic games can also output images for the left and right eyes. With TriDef 3D, software like Iz3D can do this. As for the simultaneous display of two screens, the test found that the transmission speed and stability of the wireless local area network (WLAN) are difficult to meet the requirements, but the use of wired local area network (LAN) or direct connection with crossover cables can meet this requirement.

The principle of the basic algorithm is as follows. First, A sends a synchronous correction signal to B, and the content is the system time value on the A machine. , and at the same time, A also records the time when the signal is sent out. B immediately returns a signal to A after receiving it, and the content is the system time value on the B machine . A receives the signal returned by B After that, record your own system time when receiving the signal at the same time . In this way, the transmission time difference between AB and AB can be calculated. . Then the system time difference between AB and AB can be calculated. . Get the time difference between the AB two machine systems , the preparations are done. Playing video is essentially playing pictures at high speed. Then when machine A wants to set the time in its own system time When playing the picture P, the time signal Send it to B, let B be in B's system time Time to play picture P on it. The amount of advance should be greater than the time required for transmission . This process is carried out in real time, so the time difference between AB and AB can be constantly corrected to achieve synchronous playback. The effect is shown in Figure 6.

The embodiments of the present invention described above are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims (6)

1. a 3D display system, is characterized in that, comprises display 1, display 2, half-reflecting mirror and polarization 3D glasses; The polarized light that wherein display 1 and display 2 are launched is equidirectional, and the backlight of display 1 and display 2 is LED light source or CCFL light source, and the panel of display 1 and display 2 is TN profile plate;

Display 1 is a angle with display 2 to be placed at grade, 70 °≤a≤110 °; Half-reflecting mirror is placed on the angular bisector of angle, and polarization 3D glasses are placed on after half-reflecting mirror, and are positioned at the dead ahead of display 1 or display 2.

2. 3D display system according to claim 1, is characterized in that, the angle that described display 1 and display 2 form is 90 °.

3. 3D display system according to claim 1 and 2, is characterized in that, the transmitted intensity T of described half-reflecting mirror is 5:5, i.e. T/R=5:5 with the ratio of intensity of reflected light R.

4. 3D display system according to claim 3, is characterized in that, described half-reflecting mirror is flint glass.

5. 3D display system according to claim 1, is characterized in that, described display 1 and display 2 are by a host computer control.

6. 3D display system according to claim 5, is characterized in that, in described polarization 3D glasses, the polarization direction of an eyeglass is 45 °, and the polarization direction of another eyeglass is 135 °.