Vehicle display system

• US 20060215244A1
• Filed: 05/31/2006
• Published: 09/28/2006
• Est. Priority Date: 12/02/2003
• Status: Abandoned Application

• Current Assignee: ELOP Electro-Optics Industries Limited
• Original Assignee: ELOP Electro-Optics Industries Limited
• Inventors: Dabby-Dvir, Tsadock, Levi, Bezalei, Friedland, Igor, Yosha, Jacob
• Application Number:
  US11/443,720
• Publication Number:
  US 20060215244A1
• Time in Patent Office: Days
• US Class Current: 359/15
• CPC Class Codes: G02B 2027/014 comprising information/image processing systems
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: G02B 6/00 Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings

Abstract

System for displaying an incident image for an operator of a vehicle, the system including an optical assembly receiving the incident image from an image source, and a planar optical module optically coupled with the optical assembly, the optical assembly producing a collimated light beam according to the incident image, the planar optical module being located in a line of sight of the operator, the planar optical module displaying a set of output decoupled images, each of the output decoupled images being similar to the incident image, and each of the output decoupled images having a focal point substantially located at an infinite distance from the operator.

Claims

1. System for displaying an incident image for an operator of a vehicle, the system comprising:

an optical assembly receiving said incident image from an image source, said optical assembly producing a collimated light beam according to said incident image; and

a planar optical module optically coupled with said optical assembly, said planar optical module being located in a line of sight of said operator, said planar optical module displaying a set of output decoupled images, each of said output decoupled images being similar to said incident image, and each of said output decoupled images having a focal point substantially located at an infinite distance from said operator,

wherein said planar optical module decouples decoupled light beams respective of said output decoupled images, toward the same side of said planar optical module, at which said optical assembly directs said collimated light beam toward said planar optical module.

2. The system according to claim 1, wherein said planar optical module comprises:

a planar light guide;

a reflective surface located within said planar light guide; and

a plurality of partially reflective surfaces located within said planar light guide,

wherein said reflective surface couples said collimated light beam into said planar light guide, as a set of coupled light beams, by reflecting said collimated light beam, and

wherein at least one of said partially reflective surfaces transmits at least a portion of said set of coupled light beams, and decouples at least another portion of said set of coupled light beams by reflecting said other portion, thereby forming said set of output decoupled images.

3. The system according to claim 1, wherein said planar optical module comprises:

a planar light guide;

an input beam transforming element incorporated with said planar light guide; and

an output beam transforming element incorporated with said planar light guide,

wherein said input beam transforming element receives said collimated light beam from said optical assembly, said input beam transforming element couples said collimated light beam into said planar light guide, as a set of coupled light beams, and

wherein said output beam transforming element receives from said planar light guide and decouples as decoupled light beams, a set of coupled light beams, thereby forming said set of output decoupled images.

4. The system according to claim 3, wherein said planar optical module further comprises an intermediate beam transforming element incorporated with said planar light guide,

wherein said intermediate beam transforming element is associated with said input beam transforming element and with said output beam transforming element,

wherein said intermediate beam transforming element receives a set of coupled light beams associated with said intermediate beam transforming element and with said input beam transforming element, and

wherein said intermediate beam transforming element spatially transforms said set of coupled light beams into said planar light guide, as another set of coupled light beams.

5. The system according to claim 3, wherein each of said input beam transforming element and said output beam transforming element, is selected from the list consisting of:

refraction light beam transformer; and

diffraction light beam transformer.

6. The system according to claim 5, wherein said refraction light beam transformer is selected from the list consisting of:

prism;

Fresnel lens;

micro-prism array;

gradient index lens; and

gradient index micro-lens array.

7. The system according to claim 5, wherein said diffraction light beam transformer is a diffraction optical element.

8. The system according to claim 1, further comprising said image source.

9. The system according to claim 1, wherein said line of sight points toward a scene located at said focal point relative to said operator,

wherein said planar optical module is substantially transparent, and

wherein said planar optical module transmits a scene-image light beam respective of said scene, toward the eyes of said operator.

10. The system according to claim 1, wherein said image source is selected from the list consisting of:

liquid crystal display;

light emitting diode;

organic light emitting diode;

cathode ray tube;

liquid crystal on silicon;

laser;

scanned laser;

scanned light emitting diode;

hot cathode fluorescent lamp;

cold cathode fluorescent lamp;

incandescent light element;

flat panel display;

still image projector; and

starlight scope;

11. The system according to claim 1, wherein an output angle of said decoupled light beams, is substantially equal to an incidence angle of said collimated light beam.

12. The system according to claim 1, wherein said image source comprises:

an image data source including image data respective of every frame of said incident image, each of said frames including a plurality of pixels; and

an image reproduction apparatus coupled with said image data source, said image reproduction apparatus reproducing said incident image according to said image data, said image reproduction apparatus comprising;

a horizontal scanner scanning a modulated laser beam along a substantially horizontal axis, thereby producing a horizontally scanned laser beam;

a vertical scanner scanning said horizontally scanned laser beam along a substantially vertical axis substantially perpendicular to said substantially horizontal axis, thereby sequentially producing said frames;

an angular position detector coupled with said horizontal scanner, said angular position detector detecting the position of said horizontal scanner, thereby producing a horizontal position output;

a system controller coupled with said angular position detector and with said image data source;

a laser source for producing a laser beam; and

a modulator optically coupled with said laser source and with said horizontal scanner, and electrically coupled with said system controller, said system controller controlling the operation of said modulator according to said horizontal position output and according to said image data to modulate said laser beam, said system controller further controlling the operation of said vertical scanner according to said horizontal position output.

13. The system according to claim 12, further comprising a beam expander optically coupled between said modulator and said horizontal scanner, said beam expander producing an enlarged laser beam by enlarging a cross section of said modulated laser beam.

14. The system according to claim 13, further comprising a dynamic deflector, optically coupled between said beam expander and said horizontal scanner, said system controller being further coupled with said angular position detector and with said dynamic deflector, said system controller determining an angular deflection value according to said horizontal position output, said system controller controlling the operation of said dynamic deflector to deflect said enlarged laser beam along said substantially vertical axis, by said angular deflection value, to reduce the difference between an edge line spacing at an edge of said incident image, and a center line spacing at a center of said incident image.

15. The system according to claim 14, wherein said system controller comprises a look-up table coupled with said angular position detector and with said dynamic deflector, said system controller determining said angular deflection value according to said look-up table.

16. The system according to claim 12, further comprising a dynamic deflector optically coupled between said modulator and said horizontal scanner, said system controller being further coupled with said angular position detector and with said dynamic deflector, said system controller determining an angular deflection value according to said horizontal position output, said system controller controlling the operation of said dynamic deflector to deflect said modulated laser beam along said substantially vertical axis, by said angular deflection value, to reduce the difference between an edge line spacing at an edge of said incident image, and a center line spacing at a center of said incident image.

17. The system according to claim 16, wherein said system controller comprises:

an analog to digital converter (ADC) coupled with said angular position detector, said ADC producing a digital horizontal position output by converting said horizontal position output from analog format to digital format;

a look-up table coupled with said ADC, said look-up table including an angular deflection value for said digital horizontal position output;

a first digital to analog converter (DAC) coupled with said look-up table, said first DAC producing an analog angular deflection value by converting said angular deflection value from digital format to analog format;

a first amplifier coupled with said first DAC and with said dynamic deflector, said first amplifier producing an amplified analog angular deflection value by amplifying said analog angular deflection value;

a frequency divider coupled with said look-up table, said image data source, and with said modulator, said frequency divider determining a vertical position output according to an integration of said digital horizontal position output;

a second DAC coupled with said frequency divider, said second DAC producing an analog vertical position output by converting said vertical position output from digital format to analog format; and

a second amplifier coupled with said second DAC and with said vertical scanner, said second amplifier producing an amplified analog vertical position output, by amplifying said analog vertical position output,

wherein said dynamic deflector operates according to said amplified analog angular deflection value,

wherein said vertical scanner operates according to said amplified analog vertical position output,

wherein said frequency divider provides said modulator positional information respective of a pixel among said pixels which is currently being scanned by mutual operation of said horizontal scanner and said vertical scanner, according to said horizontal position output and said vertical position output, and

wherein said modulator modulates said laser beam according to said positional information and said image data.

18. The system according to claim 12, wherein said system controller comprises a frequency divider coupled with said angular position detector, said frequency divider determining a vertical position output according to an integration of said horizontal position output, and

wherein said system controller controls the operation of said vertical scanner according to said vertical position output.

19. The system according to claim 12, wherein said system controller comprises a frequency divider coupled with said angular position detector, said image data source, and with said modulator, said frequency divider determining a vertical position output according to an integration of said horizontal position output, said frequency divider providing said modulator positional information respective of a pixel among said pixels which is currently being scanned by mutual operation of said horizontal scanner and said vertical scanner, according to said horizontal position output and said vertical position output, and

wherein said modulator modulates said laser beam according to said positional information and said image data.

20. The system according to claim 12, further comprising scanning optics optically coupled between said vertical scanner and said optical assembly, said scanning optics directing said incident image toward said optical assembly.

21. The system according to claim 20, further comprising:

a diffuser optically coupled between said scanning optics and said optical assembly; and

a diffuser controller electrically coupled with said diffuser,

wherein said diffuser controller controls the operation of said diffuser, to reduce speckles in said incident image.

22. The system according to claim 12, further comprising:

a diffuser optically coupled between said vertical scanner and said optical assembly; and

a diffuser controller electrically coupled with said diffuser,

wherein said diffuser controller controls the operation of said diffuser, to reduce speckles in said incident image.

23. The system according to claim 12, wherein said horizontal scanner is selected from the list consisting of:

resonance type scanner; and

microelectromechanical system based scanner.