CN220730613U

CN220730613U - Optical system

Info

Publication number: CN220730613U
Application number: CN202322332770.3U
Authority: CN
Inventors: 何军; 胡健
Original assignee: Nanjing Xinshiyuan Electronics Co ltd
Current assignee: Nanjing Xinshiyuan Electronics Co ltd
Priority date: 2023-08-29
Filing date: 2023-08-29
Publication date: 2024-04-05
Anticipated expiration: 2033-08-29

Abstract

The application provides an optical system relates to the optical technology field, including light source module, one side of light source module sets up polarization beam split module, polarization beam split module's reflection side is provided with the display chip, polarization beam split module's transmission side is provided with first speculum, first speculum is used for reflecting the light of transmission side to light source module, and after polarization beam split module changes polarization direction, the back is gone out towards the display chip, the light outlet at optical system still is provided with the detector, be used for when display chip is in bright state, detect by the display chip outgoing, polarization beam split module's reflection side and transmission side's outgoing light intensity. The polarization beam splitting module and the reflecting mirror are combined to recycle the P light, so that the maximum optical efficiency is realized, and the power consumption of the light source is reduced. The structure is small and simple, the laboratory construction is convenient, and the batch mass production is convenient; under the condition of the same brightness, the utilization rate of the light source is greatly improved, and the power consumption of the light source can be reduced.

Description

Optical system

Technical Field

The present application relates to the field of optical technologies, and in particular, to an optical system.

Background

LCOS projection systems usually comprise a light source, a polarizer, a PBS (polarization beam splitter prism) and an LCOS display chip, and then the general P light is directly lost due to the semi-transparent and semi-reflective characteristics of the PBS, so that the optical utilization rate of the optical system is greatly reduced. One of the characteristics of LCOS projection systems requires higher brightness, and under the same conditions, the power of the light source must be increased to at least twice, so that the problem of increased power consumption and heat dissipation are all key factors for reducing the optical index of the LCOS projection system.

Disclosure of Invention

An object of the embodiments of the present application is to provide an optical system, which can effectively improve the light efficiency of the optical system.

In one aspect of the embodiment of the application, an optical system is provided, which comprises a light source module, one side of the light source module is provided with a polarization beam splitting module, a reflection side of the polarization beam splitting module is provided with a display chip, a transmission side of the polarization beam splitting module is provided with a first reflecting mirror, the first reflecting mirror is used for reflecting light rays of the transmission side to the light source module, the light rays are reflected to the light source module, and the light rays are reflected to the display chip after the polarization beam splitting module changes polarization direction, and a detector is further arranged at a light outlet of the optical system and used for detecting emergent light intensity of the reflection side and the transmission side of the polarization beam splitting module, which are emergent from the display chip when the display chip is in a bright state.

Optionally, the light source module includes a plurality of point light sources and a second reflecting mirror, and the plurality of point light sources are disposed on the second reflecting mirror to form an array light source.

Optionally, the point light source and the second mirror are arranged glued.

Optionally, the polarization beam splitting module includes a polarization beam splitting prism, and the polarization directions of the two light beams emitted by the polarization beam splitting prism are perpendicular.

Optionally, the polarization beam splitting module further comprises a 1/4 wave plate, and the 1/4 wave plate is located between the light source module and the polarization beam splitting prism.

Optionally, the fast axis or the slow axis of the 1/4 wave plate forms an angle of 45 degrees with the horizontal direction.

Optionally, the display chip is a liquid crystal on silicon display chip.

Optionally, the detector and the display chip are respectively located at opposite sides of the polarization beam splitting module.

The embodiment of the application provides an optical system, including light source module, one side of light source module sets up polarization beam split module, polarization beam split module's reflection side is provided with display chip, polarization beam split module's transmission side is provided with first speculum, first speculum is used for reflecting the light of transmission side to light source module, and after polarization beam split module changes polarization direction, the back is gone out towards display chip, the light outlet at optical system still is provided with the detector, be used for when display chip is in bright state, detect by display chip outgoing, polarization beam split module's reflection side and transmission side's outgoing light intensity. The polarization beam splitting module and the reflecting mirror are combined to recycle the P light, so that the maximum optical efficiency is realized, and the power consumption of the light source is reduced. The structure is small and simple, the laboratory construction is convenient, and the batch mass production is convenient; under the condition of the same brightness, the utilization rate of the light source is greatly improved, and the power consumption of the light source can be reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of an optical system according to the present embodiment;

FIG. 2 is a schematic diagram of an off-state optical path of a display chip of the optical system according to the present embodiment;

fig. 3 is a schematic diagram of an on-state optical path of a display chip of the optical system according to the present embodiment.

Icon: 101-a point light source; 102-a second mirror; a 103-1/4 wave plate; 104-a polarization splitting prism; 105—a first mirror; 106-a display chip; 107-detector.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

In the description of the present application, it should be noted that, the azimuth or positional relationship indicated by the terms "inner", "outer", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship that is commonly put when the product of the application is used, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

It should also be noted that the terms "disposed," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically defined and limited; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

Referring to fig. 1, an embodiment of the present application provides an optical system, including: the light source module, one side of light source module sets up the polarization beam split module, the reflection side of polarization beam split module is provided with display chip 106, the transmission side of polarization beam split module is provided with first speculum 105, first speculum 105 is used for reflecting the light of transmission side to light source module to go out towards display chip 106 after polarization beam split module changes polarization direction, still be provided with detector 107 at optical system's light outlet, be used for when display chip 106 is in bright state, detect by display chip 106 the outgoing light intensity of reflection side and transmission side of polarization beam split module.

The light source module is used for emitting light, and illustratively, the light source module comprises a plurality of point light sources 101 and a second reflecting mirror 102, wherein the point light sources 101 are LED light sources, and the LED light sources form the point light source 101 module; a plurality of point light sources 101 are uniformly adhered to a rectangular second reflecting mirror 102 with a specific size to form a surface lattice LED light source so as to emit light rays towards the polarization beam splitting module; the second mirror 102 is used for reflecting the light from the polarization splitting module.

The point light source 101 and the second reflecting mirror 102 may be integrally glued or separately glued.

The transmission side of the polarization splitting module is provided with a first reflecting mirror 105, the light source module comprises a second reflecting mirror 102, and the first reflecting mirror 105 is consistent with the second reflecting mirror 102.

The polarization beam splitting module comprises a polarization beam splitting Prism (PBS) 104 and a 1/4 wave plate 103, wherein the polarization beam splitting prism 104 is sensitive to incident polarization, the linear polarization angle can influence the beam splitting ratio, and the polarization directions of two beams emitted by the polarization beam splitting prism 104 are vertical. If natural light or circularly polarized light is incident, the ratio of 50:50 beam splitting. In addition to distributing energy during beam splitting, two paths of emergent light must be linearly polarized, one beam is parallel line polarized (P light), the other beam is vertical line polarized (S light), and the two linear polarization directions are different by 90 degrees.

Light rays emitted by the light source module are reflected to the display chip 106 through the polarization splitting prism 104 to form S light, the P light is transmitted to the first reflecting mirror 105, the first reflecting mirror 105 reflects the P light back to the second reflecting mirror 102, the second reflecting mirror 102 reflects the P light to the 1/4 wave plate 103, the P light passes through the 1/4 wave plate 103 twice to change the polarization direction into S light, and the S light is emitted towards the polarization splitting prism 104 and reflected to the display chip 106, so that the P light wasted in the prior art is recycled.

The display chip 106 is an LCOS display chip 106, which is a liquid crystal on silicon display unit, and requires an external light source to normally operate, and the display chip 106 has two states, i.e., an on state and an off state.

A 1/4 wave plate 103,1/4 wave plate 103 is also provided between the light source module and the polarization splitting prism 104 as a phase retarder that acts on the light to provide a phase retardation of 2/P I, requiring that one of its optical axes (fast/slow axes) form an angle of 45 ° with the horizontal.

The detector 107 is used for detecting the emergent light intensity at the light outlet of the optical system, and the detector 107 and the display chip 106 are respectively positioned at the opposite sides of the polarization beam splitter module.

Referring to fig. 2, when the display chip 106 is in the off state, the optical system provided in the embodiment of the present application has the following optical paths:

an LED is a nonlinear light source that produces light that is generated by the recombination of electrons and holes of a solid semiconductor material. This process does not involve the polarization properties of the light, so the light emitted by the LED is unpolarized. The state of the scattered light emitted from the LED light source is unchanged through the 1/4 wave plate 103.

The first beam S1 enters the PBS, and is projected and reflected on the bonding surface respectively, wherein the reflected light is S1, and the transmitted light is P. The directions of vibration of the light S1 and the light P are perpendicular to each other.

S1 is incident to the LCOS display chip 106, and the LCOS display chip 106 has no modulation effect on light when in an off state, so that the LCOS chip is equivalent to a reflector, and the light velocity entering LCOS is returned by a reflection original path, and is defined as light S2;

light S2 enters the bonding surface of the PBS again, and since the polarization state of S2 is in the vertical direction at this time, light S2 is totally reflected, and there is no transmission portion, and the reflected light is defined as S3;

the light S3 passes through the 1/4 wave plate 103 at first, the light S3 generates two components in the crystal of the 1/4 wave plate 103, the two components generate a 1/4 wavelength phase difference, after being reflected by the second reflecting mirror 102, the directions and the phase differences of the two components are unchanged, the light passes through the 1/4 wave plate 103 again, the two components are overlapped with the 1/4 wavelength phase difference again, and the 1/2 wavelength phase difference is shared, so the synthesized light is still linearly polarized light, the polarization direction is vertical to the original direction, the emergent light at the moment is defined as P4, the PBS can be completely transmitted due to the fact that the polarization direction is horizontal, the light P5 is formed by reflecting the PBS again through the first reflecting mirror 105, the state of the light P5 is not changed, the PBS is transmitted again after the light passes through the 1/4 wave plate 103 twice, the polarization direction is changed, the light defined as S6 after the light is defined as S6, and the polarization direction of the light S6 is vertical to the polarization direction, the bonding surface fixed on the PBS is totally reflected at the moment, and the light is defined as S7;

s7 and S1 are all incident light rays entering the LCOS display chip 106, so that all the light rays conform to the description, and finally, the emergent light intensity cannot be detected at the light outlet of the optical system, and the dark state is realized.

Thus, in the off state, the light paths are S1-S2-S3-P4-P5-S6-S7 in sequence.

Referring to fig. 3, when the display chip 106 is in an on state, the optical system provided in the embodiment of the present application has the following optical paths:

the first beam S1 enters the PBS and is transmitted and reflected at the glue sites, respectively, wherein the reflected light is defined as S1 and the transmitted light is defined as P. The directions of vibration of the light S1 and the light P are perpendicular to each other.

Since the LCOS display chip 106 is in a bright state, the incident light S1 is modulated, and the polarization direction of the outgoing light is changed, where the outgoing light is defined as P2, and the polarization states of the light P2 and S1 are perpendicular to each other and are P light in the horizontal direction;

the light ray P2 can directly transmit the PBS and is received by the detector 107 at the light outlet;

when the first beam of light enters the PBS, a transmission light ray P3 is defined, the polarization direction is not changed through the first reflecting mirror 105, the PBS can be transmitted again, and the light ray at the moment is defined as P4;

the light ray P4 passes through the 1/4 wave plate 103 and is reflected by the second reflecting mirror 102, and after passing through the 1/4 wave plate 103 again, the polarization direction is changed and is perpendicular to the original polarization direction, the light ray at the moment is defined as S5, the polarization direction of the light ray S5 is perpendicular, the light ray is totally reflected by the PBS, and the light ray exiting the PBS is defined as S6;

the incident light S6 is modulated, the polarization direction of the emergent light is changed, the emergent light is defined as P7 at the moment, the polarization states of the light P7 and the light S6 are mutually perpendicular, and the emergent light is the light in the horizontal direction P;

the light ray P7 can directly transmit the PBS and is received by the detector 107 at the light outlet;

all the light rays accord with the description, and finally the emergent light intensity can be detected at the light outlet of the optical system, so that the bright state is realized.

Thus, in the ON state, the optical paths thereof are S1-P2-detectors 107 in order; S3-P4-S5-S6-P7-detector 107.

The optical system provided by the embodiment of the application combines the polarization beam splitting module and the reflecting mirror, so that the P light is recycled, the maximum optical efficiency is realized, and the power consumption of the light source is reduced. The structure is small and simple, the laboratory construction is convenient, and the batch mass production is convenient; under the condition of the same brightness, the utilization rate of the light source is greatly improved, and the power consumption of the light source can be reduced.

Further, the combination of the 1/4 wave plate 103 and the reflecting mirror is utilized to recycle the P light transmitted to the first reflecting mirror 105, so that the transmitted P light propagates towards the direction of the light source module and is reflected by the second reflecting mirror 102, the polarization direction of the P light is changed into S light after passing through the 1/4 wave plate 103 twice, the S light is modulated on the display chip 106 after being reflected by the polarization splitting prism 104, the polarization direction of the S light is changed into P light again, the P light is transmitted to the detector 107, the detector 107 detects the light intensity, the maximum optical efficiency is realized, and the power consumption of the light source is reduced.

The optical system provided by the embodiment of the application is small and simple in structure, convenient for laboratory construction and convenient for batch mass production; under the condition that the loss of the optical component to the light source is not considered, the originally wasted P light is reused, so that the maximum optical efficiency is realized; by combining the LCOS display chip 106, the maximum brightness of the LCOS projection optical machine can be obviously improved; under the condition of the same brightness, the utilization rate of the light source is greatly improved, and the power consumption of the light source can be reduced.

The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, and various modifications and variations may be suggested to one skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An optical system, comprising: the light source module, one side of light source module sets up the polarization beam split module, the reflection side of polarization beam split module is provided with the display chip, the transmission side of polarization beam split module is provided with first speculum, first speculum is used for with the light reflection of transmission side is to light source module, and warp the polarization beam split module changes the polarization direction back orientation the display chip outgoing the light outlet of optical system still is provided with the detector, is used for when the display chip is in bright state, detect by the display chip outgoing the reflection side of polarization beam split module with the outgoing light intensity of transmission side.

2. The optical system of claim 1, wherein the light source module comprises a plurality of point light sources and a second mirror, the plurality of point light sources being disposed on the second mirror to form an array light source.

3. The optical system of claim 2, wherein the point light source and the second mirror are arranged in a glued manner.

4. The optical system of claim 1, wherein the polarization splitting module comprises a polarization splitting prism, and the polarization directions of two light beams emitted by the polarization splitting prism are perpendicular.

5. The optical system of claim 4, wherein the polarizing beam splitter module further comprises a 1/4 wave plate, the 1/4 wave plate being positioned between the light source module and the polarizing beam splitter prism.

6. The optical system of claim 5, wherein the fast or slow axis of the 1/4 wave plate is at a 45 degree angle to horizontal.

7. The optical system of claim 1, wherein the display chip is a liquid crystal on silicon display chip.

8. The optical system of claim 1, wherein the detector and the display chip are located on opposite sides of the polarizing beam splitting module, respectively.