CN111323958A

CN111323958A - Polarized light modulation waveguide display scheme

Info

Publication number: CN111323958A
Application number: CN201811535369.7A
Authority: CN
Inventors: 不公告发明人
Original assignee: Shi Xuanjie
Current assignee: Shi Xuanjie
Priority date: 2018-12-14
Filing date: 2018-12-14
Publication date: 2020-06-23

Abstract

The invention discloses a polarized light modulation waveguide display scheme which has very high light energy utilization rate and can not generate stray light.

Description

Polarized light modulation waveguide display scheme

Technical Field

The invention relates to a waveguide display scheme, in particular to a polarized light modulation waveguide display scheme.

Background

The existing various optical waveguide display schemes are not suitable for ultra-low power consumption equipment because the light energy utilization rate is very low due to the limitation of the principle. The existing optical waveguide display scheme is easy to generate stray light and influence the display effect.

Disclosure of Invention

The invention provides a polarized light modulation waveguide display scheme which has very high light energy utilization rate and does not generate stray light.

The invention is realized by the following technical scheme:

a polarized light modulation waveguide display scheme comprises a flat waveguide, a plurality of polarization control surfaces and a polarization control system.

A plurality of polarization control surfaces are embedded in the middle of the waveguide, the plurality of polarization control surfaces being parallel to each other, and a polarization control system is connected to and controls each polarization control surface. The polarization control surface comprises two transparent electrodes, two layers of alignment films are arranged between the two transparent electrodes, a liquid crystal layer is arranged between the alignment films, the rotation direction of liquid crystal is preset in the alignment films, and the PBS light splitting film is arranged on the inclined surface of the waveguide and is attached to one layer of the transparent electrodes.

The working principle of the invention is as follows:

the working principle of the polarization control surface in the scheme is as follows, when no voltage is applied to the transparent electrode of the polarization control surface, incident light P polarized light passes through the transparent electrode and is changed into S polarized light after passing through the liquid crystal layer, the S polarized light reaches the PBS light splitting film and is reflected out, the reflected light is changed back into P polarized light through the liquid crystal layer, and the P polarized light is output from the waveguide.

When voltage is applied to the transparent electrodes, the arrangement direction of the liquid crystal is fixed by the voltage, incident light P polarized light is also P polarized light after passing through the electrodes and the liquid crystal, the P polarized light passes through the PBS light splitting film to be continuously transmitted in the waveguide, and no light is output at the moment.

The polarization control system can control whether each polarization control surface outputs light or not by controlling the voltage of the electrodes.

The working principle of the scheme is as follows: the light of the image source becomes P polarized light after being collimated and expanded through the polaroid and then enters the waveguide, and the polarization control system sequentially controls the polarization control surfaces to output light at a high speed, so that the effect of simultaneously outputting a plurality of control surfaces in vision can be achieved.

Because only one polarization control surface is in reflection output at the same moment, stray light can not be generated to influence the display effect. Since there is always one polarization control surface reflecting all the light at any one time, the present solution has a theoretical utilization of 100% of the light entering the waveguide.

The invention has the advantages that the light rays input into the waveguide can be fully utilized, and stray light influencing the display effect can not be generated.

Drawings

Fig. 1 is a schematic diagram of a polarization control plane, and fig. 2 is a schematic diagram of an exemplary operation of the present invention.

Detailed Description

The technical scheme of the invention is further described in the following with the accompanying drawings.

Fig. 1 is a block diagram of a polarization control surface. In the figure, 14 is a PBS splitting film, 11, 12 are two transparent electrodes, 9, 10 are alignment films, and 13 is a liquid crystal layer. 15 is the typical incident ray direction.

When no voltage is applied between the

transparent electrodes

11 and 12, the incident light P-polarized light passes through the transparent electrode 11, passes through the alignment film 10, and reaches the liquid crystal layer 13, the P-polarized light is rotated by the liquid crystal into S-polarized light, the S-polarized light passes through the alignment film 9, passes through the transparent electrode 12, and reaches the PBS splitting film, the PBS splitting film totally reflects the S-polarized light, the reflected light passes through the transparent electrode 12, the alignment film 9, the liquid crystal layer 13, the alignment film 10, and the transparent electrode 11 in sequence, and the light is changed back to P-polarized light, and the P-polarized light is output from the waveguide.

When a voltage is applied to the

transparent electrodes

11 and 12, the liquid crystal arrangement direction is fixed by the voltage, and the P-polarized light passes through the transparent electrode 11, the alignment film 10, the liquid crystal layer 13, the alignment film 9, the transparent electrode 12 and the PBS light splitting film in sequence and continues to propagate in the waveguide.

Fig. 2 is a schematic diagram of a typical case of the present invention.

In fig. 2, 1 is an image source, 2 is a collimation expanding part, 3 is a polarizing plate, 4 is a waveguide plate, and 5, 6, 7 and 8 are polarization control surfaces in the waveguide plate.

The polarization control system of the scheme is divided into a plurality of time intervals during working:

in the first operating period, the transparent electrodes in the polarization control surface 5 have no voltage, and all light is output at the polarization control surface 5, and the transparent electrodes of the polarization control surfaces 6, 7, 8 have voltage and do not output light.

In a second operating period, no light is output when the polarization control surfaces 5, 7, 8 are charged with voltage, no voltage is applied to the polarization control surface 6, and the light in the waveguide passes through the polarization control surface 5 and is output at the polarization control surface 6.

In a third operating period, no light is output when the polarization control surfaces 5, 6, 8 are charged with voltage, no voltage is applied to the polarization control surface 7, and the light in the waveguide passes through the polarization control surfaces 5, 6 and is output at the polarization control surface 7.

In a fourth operating period, no light is output with a voltage applied to the polarization control surfaces 5, 6, 7, and no voltage is applied to the polarization control surface 8, and the light in the waveguide passes through the polarization control surfaces 5, 6, 7 and is output at the polarization control surface 8.

After the fourth operating period is completed, the system is cycled at high speed in this manner, returning to the state of the first operating period.

The polarization control system realizes two-dimensional extended output in the same way, the two rows of polarization control surfaces are arranged along the X direction and the Y direction which are mutually vertical during two-dimensional output, and each polarization control surface in the Y direction is scanned and output by the polarization control system once in a light output period of each polarization control surface in the X direction.

When the two-dimensional output is carried out, a polarization control surface always reflects and outputs all light rays at any moment, so that the two-dimensional expansion output can also realize the full utilization of light energy.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A polarized light modulation waveguide display scheme is characterized by comprising a flat waveguide, a plurality of polarization control surfaces and a polarization control system, wherein the polarization control surfaces are arranged in the middle of the waveguide, the polarization control surfaces are parallel to each other, and the polarization control system is connected with and controls each polarization control surface.

2. The waveguide display scheme according to claim 1, wherein the polarization control surface comprises two transparent electrodes, two alignment films, a liquid crystal layer, and a PBS splitting film, wherein two alignment films are disposed between the two transparent electrodes, a liquid crystal layer is disposed between the two alignment films, and the PBS splitting film is disposed on the inclined plane in the waveguide and attached to one of the transparent electrodes.

3. The waveguide display scheme of claim 1, wherein when no voltage is applied to the transparent electrodes of the polarization control surface, the incident light P-polarized light passes through the transparent electrodes and the liquid crystal layer and becomes S-polarized light, the S-polarized light is reflected by the PBS splitting film, the reflected light passes through the liquid crystal layer again and becomes P-polarized light, and the P-polarized light can be output from the waveguide.

4. The waveguide display scheme according to claim 1, wherein when the transparent electrodes of the polarization control surface are applied with voltage, the incident light P-polarized light passes through the transparent electrodes and the liquid crystal layer and is also P-polarized light, and the P-polarized light passes through the PBS splitting film to be further transmitted in the waveguide.

5. The waveguide display scheme as claimed in claim 1, wherein the polarization control system controls the polarization control surfaces to output light by controlling the voltage of the transparent electrodes, and the polarization control system controls the polarization control surfaces to output light by controlling the polarization control surfaces to output light at high speed, so that the plurality of polarization control surfaces output light simultaneously visually.

6. The waveguide display scheme as claimed in claim 1, wherein the polarization control system outputs light by sequentially controlling two orthogonal polarization control surfaces at high speed to realize two-dimensional extended output, the polarization control surfaces are arranged along mutually perpendicular X and Y directions during the two-dimensional output, and each polarization control surface in the Y direction is sequentially scanned and outputted by the polarization control system during the period of time when each polarization control surface in the X direction outputs light.

7. The polarized light modulating waveguide display scheme of claim 1 wherein the polarization control surfaces when combined into triangular waveguides provide controlled dual output, and the polarization control system controls which side of which waveguide outputs the image.