CN102582518A - Automotive backseat projection display system - Google Patents

Abstract

An automotive backseat projection display system adopts a miniature laser projection device to replace a traditional liquid crystal display, and comprises the miniature laser projection device and a foldable screen. The miniature laser projection device comprises a laser source module, a control circuit and a miniature scanning device, wherein an input end of the control circuit is connected with a video output interface of an automotive electronic control unit so as to receive video signals provided by the automotive electronic control unit, an input end of the laser source module is connected with an output end of the control circuit so as to receive high-speed modulation signals sent by the control circuit, and the laser source module is used for outputting red, green and blue laser to be projected onto a reflector of the miniature scanning device in high-speed scanning, so that the red, green and blue laser is reflected onto the foldable screen. The automotive backseat projection display system has the advantages of small size, light weight, wide color gamut, high contrast ratio, large viewable size, no need for a focusing lens and the like.

Description

The back seat projection display system

Technical field

This patent relates to a kind of back seat projection display system.This system adopts the miniature laser projection arrangement, is used to replace traditional Liquid Crystal Display (LCD).

Background technology

The passenger proposes requirements at the higher level for the back seat amusement function of modern automobile in recent years, and therefore above car or the SUV of middle rank often is used to provide information to show functions such as video playback for rear rider provides Liquid Crystal Display (LCD) independent or that share.Fast-developing in recent years miniature laser projection arrangement is owing to adopt the redgreenblue laser to make light source; Compare with traditional Liquid Crystal Display (LCD), have colour gamut broadness (laser projection is a 200%NTSC standard gamut range, and liquid crystal display is about 75%NTSC standard gamut range); High-contrast; High saturation, therefore advantages such as low-power consumption are fit to replace Liquid Crystal Display (LCD) and are used for the back seat display system very much.

Summary of the invention

Technical matters to be solved by this invention is to realize a kind of back seat projection display system based on the miniature laser projection arrangement, is used to replace traditional Liquid Crystal Display (LCD).

For realizing above-mentioned purpose, the present invention adopts technical scheme to be: the back seat projection display system comprises miniature laser projection arrangement and folding screen.The input end of described miniature laser projection arrangement links to each other with the signaling interface of running computer.Described miniature laser projection arrangement is incident upon image or video on the folding screen.

Described miniature laser projection arrangement comprises laser light source module, control circuit and miniscanning device.Produce redgreenblue laser by laser light source module, be transferred to the miniscanning device through optical system, and reflex on the screen.Control circuit is accepted the vision signal of running computer and is converted into the RGB digital signal and row/field sync signal at high speed modulated laser light source module carries out high speed two-dimension scanning with control miniscanning device.Image or video that high speed two-dimension scanning produces are projeced on the folding screen.

Described laser light source module comprise can High Speed Modulation each one of red/green/blue laser and collimation/close beam optics system.The wavelength of red laser is generally 635nm to 642nm, can be red laser diode; The wavelength of green laser is generally 515nm to 532nm, can be for based on secondary harmonizing wave multiple frequency technology (Second Harmonic Generation, green laser SHG) or green laser diode; The wavelength of blue laser is generally 515nm to 532nm, can be blue laser diode.Collimation/close beam optics system comprises each one group of the collimating lens of corresponding red/green/blue laser, and 2 of dichroscope filters or 3X1 fiber coupling device (Fiber Coupler or Combiner) are used for the synthetic beam of laser of the red/green/blue laser behind the collimation.

Described control circuit can be accepted the vision signal of running computer and be converted into the RGB digital signal and row/field sync signal at high speed modulated laser light source module carries out high speed two-dimension scanning with control miniscanning device.

Described miniscanning device is MEMS (the Microelectromechanical Systems that is used for two dimensional laser scanning; MEMS) micro scanning mirror, it comprises movable catadioptre and makes the actuator (Actuator) of catadioptre around X axle and Y axle high speed rotating.Its structure has two kinds usually: (1) single twin shaft micro scanning mirror that universal-joint (Gimbal) is arranged or do not have universal-joint (Gimbal-less), comprise that a short scan axle (X axle) is used for line scanning and a slow sweep axle (Y axle) is used for field scan, and two axles are mutually orthogonal; (2) two single shaft micro scanning mirrors, one of them scan mirror are responsible for line scanning (being the scanning of X axle), and it is realized accomplishing by fast-loop driver; The single shaft micro scanning mirror that another quadrature is placed is accomplished slower field scan (scanning of Y axle).The scan mode of MEMS micro scanning mirror can be lined by line scan for two-way, promptly scans from left to right in odd-numbered line, and even number line scans from right to left; Or two-way staggered scanning, promptly in the scanning from left to right of first row, the third line scans from right to left; Fifth line scans from left to right, by that analogy, after accomplishing odd field scanning, begins in the scanning from left to right of second row; Fourth line scans from right to left; The scanning from left to right of the 6th row, by that analogy, to accomplish even field scanning.

Described folding screen is used to receive miniature laser projection arrangement institute's image projected or video.Folding screen is positioned at the rear portion of front-row seats of vehicle, or the rear portion of armrest box between the front-row seats of vehicle, or the car body top between the automobile front and rear row.

The present invention has following advantage owing to adopted technique scheme:

1, show that colour gamut is wide, contrast ratio is high, and degree of saturation specific humidity is high, and is low in energy consumption;

2, volume little, in light weight, simple in structure, be easy to realize;

3, need not condenser lens.

Description of drawings

Fig. 1 is a structured flowchart of the present invention.

Fig. 2 is a scheme drawing of the present invention.

The specific embodiment

The present invention is described further with embodiment below in conjunction with accompanying drawing 1: as shown in Figure 1, it comprises miniature laser projection arrangement 1 and folding screen 2.Wherein miniature laser projection arrangement 1 comprises laser light source module 11, control circuit 12 and miniscanning device 13.The input end of control circuit 12 links to each other with the video output interface of running computer 3, receives the vision signal that running computer 3 provides.The input end of laser light source module 11 links to each other the High Speed Modulation signal that reception control circuit 12 sends with a mouth of control circuit 12.Laser light source module 11 output redgreenblue laser are projected on the catadioptre of miniscanning device 13 of high-velocity scanning, and reflex on the folding screen 2.Another mouth of control circuit 12 links to each other with the input end of miniscanning device 13, and the electronic control signal control miniscanning device 13 that control circuit 12 produces is accomplished high-velocity scanning.

Described miniature laser projection arrangement 1 comprises laser light source module 11, control circuit 12 and miniscanning device 13.Produce redgreenblue laser by laser light source module 11, be transferred to miniscanning device 13 through optical system, and reflex on the folding screen 2.Control circuit 12 accepts the vision signal of running computer 3 and is converted into the RGB digital signal and row/and field sync signal at high speed modulated laser light source module 11 carries out high speed two-dimension scanning with control miniscanning device 13.Miniature laser projection arrangement 1 can be positioned at automobile rear car body top or automobile rear seat center armrest.

Described laser light source module 11 comprise can High Speed Modulation each one of red/green/blue laser and collimation/close beam optics system.The wavelength of red laser is generally 635nm to 642nm, can be red laser diode; The wavelength of green laser is generally 515nm to 532nm, can be green laser or the green laser diode based on the secondary harmonizing wave multiple frequency technology; The wavelength of blue laser is generally 515nm to 532nm, can be blue laser diode.Collimation/close beam optics system comprises each one group of the collimating lens of corresponding red/green/blue laser, and 2 of dichroscope filters or 3X1 fiber coupling device are used for the synthetic beam of laser of the red/green/blue laser behind the collimation.

Described control circuit 12 can accept the vision signal of running computer and be converted into the RGB digital signal and row/and field sync signal at high speed modulated laser light source module 11 carries out high speed two-dimension scanning with control miniscanning device 13.

Described miniscanning device 13 is for being used for the MEMS micro scanning mirror of two dimensional laser scanning, and it comprises movable catadioptre and makes the actuator of catadioptre around X axle and Y axle high speed rotating.Its structure has two kinds usually: (1) single twin shaft micro scanning mirror that universal-joint is arranged or do not have universal-joint, comprise that a short scan axle (X axle) is used for line scanning and a slow sweep axle (Y axle) is used for field scan, and two axles are mutually orthogonal; (2) two single shaft micro scanning mirrors, one of them scan mirror are responsible for line scanning (being the scanning of X axle), and it is realized accomplishing by fast-loop driver; The single shaft micro scanning mirror that another quadrature is placed is accomplished slower field scan (scanning of Y axle).The scan mode of MEMS micro scanning mirror can be lined by line scan for two-way, promptly scans from left to right in odd-numbered line, and even number line scans from right to left; Or two-way staggered scanning, promptly in the scanning from left to right of first row, the third line scans from right to left; Fifth line scans from left to right, by that analogy, after accomplishing odd field scanning, begins in the scanning from left to right of second row; Fourth line scans from right to left; The scanning from left to right of the 6th row, by that analogy, to accomplish even field scanning.

Described folding screen 2 is used to receive 11 image projected of miniature laser projection arrangement or video.Folding screen is positioned at the rear portion of front-row seats of vehicle, or the rear portion of armrest box between the front-row seats of vehicle, or the car body top between the automobile front and rear row.

Claims (7)

1. back seat projection display system; It is characterized in that: it comprises miniature laser projection arrangement and folding screen; The input end of described miniature laser projection arrangement links to each other with the signaling interface of running computer, and described miniature laser projection arrangement is incident upon image or video on the folding screen.

2. miniature laser projection arrangement as claimed in claim 1, it is characterized in that: it comprises laser light source module, control circuit and miniscanning device.The input end of control circuit links to each other with the video output interface of running computer, receives the vision signal that the running computer provides.The input end of laser light source module links to each other the High Speed Modulation signal that reception control circuit sends with a mouth of control circuit.Laser light source module output redgreenblue laser is projected on the catadioptre of miniscanning device of high-velocity scanning, and reflexes on the folding screen.Another mouth of control circuit links to each other with the input end of miniscanning device, and the electronic control signal control miniscanning device that control circuit produces is accomplished high-velocity scanning.

3. laser light source module as claimed in claim 2 is characterized in that: each one of red/green/blue laser that comprising can High Speed Modulation (being generally tens MHz to MHz up to a hundred) and collimation/close beam optics system.

4. as claimed in claim 3 red/green/blue laser, it is characterized in that: the wavelength of red laser is generally 635nm to 642nm, can be red laser diode; The wavelength of green laser is generally 515nm to 532nm, can be green laser or the green laser diode based on the secondary harmonizing wave multiple frequency technology; The wavelength of blue laser is generally 515nm to 532nm, can be blue laser diode.

5. collimation as claimed in claim 3/close the beam optics system is characterized in that: comprise corresponding red/each one group of the collimating lens of green/blue laser, 2 of dichroscope filters or 3X1 fiber coupling device.

6. control circuit as claimed in claim 2 is characterized in that: comprise Digital Video Processing circuit and microcontroller.

7. miniscanning device as claimed in claim 2 is characterized in that: based on micro electro mechanical system (MEMS) technology, comprise movable catadioptre and make the actuator of catadioptre around X axle and Y axle high speed rotating.

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