CN218896257U

CN218896257U - DLP3D projection based on liquid crystal polarization converter

Info

Publication number: CN218896257U
Application number: CN202223166251.6U
Authority: CN
Inventors: 刘远; 侯艳磊; 杨成业; 吴景淼; 孙旭涛; 孙中尚
Original assignee: Foxstar Technology Co ltd; Henan Costar Group Co Ltd
Current assignee: Foxstar Technology Co ltd; Henan Costar Group Co Ltd
Priority date: 2022-11-29
Filing date: 2022-11-29
Publication date: 2023-04-21
Anticipated expiration: 2032-11-29

Abstract

The utility model provides a DLP3D projection based on a liquid crystal polarization converter, which comprises a bulb light source, a DMD chip, the liquid crystal polarization converter, a projection lens, a DLP chip and a motor controller. The bulb light source emits natural light, and the liquid crystal polarization converter is arranged between the DMD chip and the projection lens and can receive a DLP chip control signal to alternately emit S polarized light and P polarized light at a set frequency. The liquid crystal polarization converter is provided with an S polarization film, and the S polarization light and the P polarization light are alternately emitted at the fastest frequency of 120HZ according to the voltage received by the liquid crystal polarization converter. The user can see the projected 3D picture by wearing polarized glasses with different P light polaroids and S light polaroids. The viewer can watch the 3D projection effect by only using one common polarized glasses, and does not need to purchase the 3D glasses additionally.

Description

DLP3D projection based on liquid crystal polarization converter

Technical Field

The utility model belongs to the technical field of bulb-type DLP projection devices, and particularly relates to a DLP3D projection based on a liquid crystal polarization converter.

Background

A bulb-type DLP projector is a projection technology that uses a DLP chip and a DMD chip to achieve projection of an image by adjusting reflected light. The common bulb type DLP projector is powered by a power panel to power a high-voltage mercury lamp, the mercury lamp generates a natural light source, and the light source enters the optical machine through a designed light path. The light source is divided into red, green and blue light inside the optical machine. The three-color light is incident on the DMD panel, and the DLP chip controls the deflection of the DMD panel to project the color to the lens to be combined into a picture. The common light bulb DLP3D projection is to divide an image into two pictures by using a DLP chip, then wear special 3D glasses, wherein a small chip is arranged in the glasses to control liquid crystal switches on the two glasses, the frequency of the liquid crystal switches is consistent with the frequency processed by the DLP chip, so that pictures seen by left and right eyes of a human body are inconsistent, and then the pictures are combined into one picture according to the visual residual effect of the human eyes, so that a 3D effect is formed. Each experimenter of the existing bulb-type DLP3D projection must wear special 3D glasses, and the bulb-type DLP3D projection has high price and high damage rate.

Disclosure of Invention

In view of the above problems, the present utility model aims to provide a DLP3D projection based on a liquid crystal polarization converter, wherein the projected image is divided into left and right eye polarized light according to video, and a viewer can view the 3D projection effect by using only one common polarized glasses without purchasing additional 3D glasses.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the DLP3D projection based on the liquid crystal polarization converter comprises a bulb light source, a DMD chip, the liquid crystal polarization converter, a projection lens, a DLP chip and a motor controller;

the bulb light source emits natural light;

the liquid crystal polarization converter is arranged between the DMD chip and the projection lens and can receive a DLP chip control signal, and alternately emits S polarized light and P polarized light at a set frequency;

the motor controller controls the liquid crystal polarization converter to pass or not pass through the projection light path to convert the 3D and 2D projection modes.

Further, the DLP chip processes the image data and sends out a control signal of the liquid crystal polarization converter, and the control signal controls the liquid crystal polarization converter to switch at a high speed at a set frequency.

The liquid crystal polarization converter comprises a liquid crystal layer, glass material coatings are arranged on the upper surface and the lower surface of the liquid crystal layer, and an S polarized film is arranged on the light incidence side of the liquid crystal layer and converts natural light into S polarized light.

Compared with the prior art, the utility model has the beneficial effects that: when the light source outputs, a liquid crystal polarization converter which is controlled by the DLP chip and can be freely ejected is added between the DMD chip and the projection lens, and the converter can convert the working mode according to the circuit driving voltage. The converter is provided with an S polarization film, and the S polarization light and the P polarization light are alternately emitted at the highest frequency of 120HZ according to the voltage received by the converter. The user can see the projected 3D picture by wearing polarized glasses with different P light polaroids and S light polaroids. When the 3D mode is not used, the liquid crystal converter is moved out of the light path by the motor controller, so that the original projection image is ensured not to change. The viewer can watch the 3D projection effect by only using one common polarized glasses, and does not need to purchase the 3D glasses additionally.

Drawings

FIG. 1 is a functional block diagram of the present utility model;

FIG. 2 is a schematic diagram of the operation of the liquid crystal polarization converter of the present utility model in passing through an optical path;

FIG. 3 is a diagram illustrating operation of the liquid crystal polarization converter according to the present utility model without passing through the optical path;

FIG. 4 is a control diagram of a driving liquid crystal polarization converter according to the present utility model;

FIG. 5 is a schematic view of the liquid crystal layer of the present utility model when not in operation;

FIG. 6 is a schematic diagram of the operation of the liquid crystal layer according to the present utility model;

FIG. 7 is a logic diagram of a liquid crystal polarization converter control according to the present utility model;

fig. 8 is a logic diagram of DLP chip program control according to the present utility model.

Detailed Description

The technical scheme of the utility model is described in detail below with reference to the accompanying drawings and the specific embodiments.

Referring to fig. 1 to 8, a DLP3D projection based on a liquid crystal polarization converter includes a bulb light source, a DMD chip 1, a liquid crystal polarization converter 2, a projection lens 3, a DLP chip, and a motor controller; the bulb light source emits natural light, the emitted natural light is converted into red, green and blue three-color light through the color wheel, and then the three-color light is projected to the DMD chip for imaging.

The liquid crystal polarization converter is arranged between the DMD chip and the projection LENS LENS and can receive the control signal of the DLP chip to alternately emit S polarized light and P polarized light at a set frequency.

The motor controller controls the liquid crystal polarization converter to pass or not pass through the projection light path to convert the 3D and 2D projection modes. The liquid crystal polarization converter is in a 3D projection mode when passing through the light path, and is in a 2D projection mode instead.

The DLP chip processes the image data and sends out a liquid crystal polarization converter control signal, and the control signal controls the liquid crystal polarization converter to conduct high-speed switching at a set frequency.

The liquid crystal polarization converter includes a liquid crystal layer 21, a glass material coating 22 provided on both upper and lower surfaces of the liquid crystal layer, and an S-polarization film 23 provided on a light incident side of the liquid crystal layer, the S-polarization film converting natural light into S-polarized light.

As shown in fig. 3, when the user selects the 3D mode, the motor controller moves the liquid crystal polarization converter that was not in the optical path between the DMD chip and the projection lens. The program can control the DLP chip to output frequency voltage which accords with the input source, and the voltage signal is transmitted to the driving chip to control the switch of the liquid crystal polarization converter.

After receiving the control signal, the liquid crystal polarization converter starts to control light. As shown in fig. 4, when the applied voltage of the liquid crystal layer is 0, the liquid crystal polarization converter does not work, the incident S polarized light passes through the liquid crystal layer, the polarization direction is not twisted, the S polarized light is output through the liquid crystal layer, and the rest polarized light cannot be output. As shown in fig. 5, when the liquid crystal layer is applied with a voltage of 5-10V, the incident S-polarized light is converted into P-polarized light output through the liquid crystal layer. The control signal controls the liquid crystal polarization converter to conduct high-speed switching at the frequency of the fastest 120HZ, and the light beam passing through the liquid crystal converter becomes the light beam with the frequency of the fastest 120HZ and the P/S polarization continuously converted. Such polarized light beams can be seen as 3D images by using different polarizer glasses for the left and right eyes.

Three types of frame sequence, frame encapsulation and left-right superposition are commonly used in 3D image transmission, wherein VGA only determines the common frame sequence, and HDMI is the common frame encapsulation and superposition format. In this embodiment: as shown in fig. 7 and 8, it is determined whether or not a 3D signal is inputted every time a signal is inputted, and a 3D signal format is determined. When a signal is input, the projector chip judges which signal source format is input first, and then reads the data information of the signal according to the input signal source format: such as refresh rate, picture resolution, etc. And if the read information meets the requirement, starting a 3D mode, controlling the liquid crystal polarization converter to move and starting to convert polarized light according to the frame sequence. Otherwise, the 3D mode is not started, and the projection is normal. When the assembly is in operation, the DLP chip begins processing image data and issuing liquid crystal polarization converter control signals, the control logic is shown in fig. 4. Such arithmetic logic can perfectly display 3D images according to input sources.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model are included in the protection scope of the present utility model.

Claims

1. The DLP3D projection based on the liquid crystal polarization converter is characterized by comprising a bulb light source, a DMD chip, the liquid crystal polarization converter, a projection lens, a DLP chip and a motor controller;

the bulb light source emits natural light;

2. The liquid crystal polarization converter based DLP3D projection of claim 1, wherein the DLP chip processes image data and issues a liquid crystal polarization converter control signal that controls the liquid crystal polarization converter to switch at a set frequency at high speed.

3. The DLP3D projection based on a liquid crystal polarization converter according to claim 2, wherein the liquid crystal polarization converter comprises a liquid crystal layer, glass material coatings are disposed on the upper and lower surfaces of the liquid crystal layer, and an S-polarized film is disposed on the light incident side of the liquid crystal layer, and the S-polarized film converts natural light into S-polarized light.