Pocket-sized two-dimensional image projection system

• US 20070041077A1
• Filed: 08/19/2005
• Published: 02/22/2007
• Est. Priority Date: 08/19/2005
• Status: Abandoned Application

• Current Assignee: Angstrom, Inc., Stereo Display, Inc.
• Original Assignee: Angstrom, Inc., Stereo Display, Inc.
• Inventors: Seo, Cheong, Cho, Gyoung
• Application Number:
  US11/208,114
• Publication Number:
  US 20070041077A1
• Time in Patent Office: Days
• US Class Current: 359/291
• CPC Class Codes: G03B 21/008 using micromirror devices
• CPC Class Codes: G03B 21/208 Homogenising, shaping of the illumination light
• CPC Class Codes: H04N 5/7458 the modulator being an array of deformable mirrors, e.g. digital micromirror device [DMD]

Abstract

A pocket-sized two-dimensional image projection device adapted to a portable device is invented. The pocket-sized two-dimensional image projection device projects two-dimensional image on a projection surface with arbitrary profile and arbitrary distance from the projection device, and arbitrary attitude about the projection device. The position, profile, and attitude of the projection surface about the projection device can be arbitrary because the projection surface is not embodied in the projection device to reduce size of the device. Each micromirror array lens has the ability of scanning and focusing on the projection surface. The focusing on the projection surface can be achieved by automatic focusing function of micromirror array lens. Therefore, an in-focused two-dimensional image can be displayed on arbitrary projection surface. Also, this invention makes a brighter and less power consuming display device, which give an advantage for the portable device application.

Claims

1. A pocket-sized two-dimensional image projection device, wherein the projection device is adapted to a portable device, wherein the projection device comprises a micromirror array lens or an array of micromirror array lenses, wherein the micromirror array lens comprise a plurality of micromirrors.

2. The pocket-sized two-dimensional image projection device of claim 1, wherein each micromirror array lens can change its optical property independently.

3. The pocket-sized two-dimensional image projection device of claim 2, wherein each micromirror array lens can change its focal length independently.

4. The pocket-sized two-dimensional image projection device of claim 2, wherein each micromirror array lens can change its optical axis independently.

5. The pocket-sized two-dimensional image projection device of claim 2, wherein the number of micromirrors comprising one micromirror array lens independently varies from the number of micromirrors comprising the other micromirror array lenses.

6. The pocket-sized two-dimensional image projection device of claim 1, wherein the micromirror array lens scans and focuses light on a projection surface, wherein the light is being scanned by traversing the focused light along the surface by a micromirror array lens.

7. The pocket-sized two-dimensional image projection device of claim 6, wherein the projection surface is a plane.

8. The pocket-sized two-dimensional image projection device of claim 6, wherein the projection surface has arbitrary profile and the light is focused on the arbitrary profile.

9. The pocket-sized two-dimensional image projection device of claim 6, the projection surface is located at the arbitrary distance from the projection device and the light is focused on the projection surface at the arbitrary distance.

10. The pocket-sized two-dimensional image projection device of claim 6, the projection surface is a desk surface.

11. The pocket-sized two-dimensional image projection device of claim 6, the projection surface is a wall.

12. The pocket-sized two-dimensional image projection device of claim 6, wherein each micromirror array lens scans light along the projection surface independently.

13. The pocket-sized two-dimensional image projection device of claim 6, wherein several micromirror array lenses scan the same positions in the projection surface simultaneously.

14. The pocket-sized two-dimensional image projection device of claim 6, wherein each of the micromirror array lenses scan the projection surface at different speeds.

15. The pocket-sized two-dimensional image projection device of claim 6, wherein the device scans the projection surface using the random scanning technique.

16. The pocket-sized two-dimensional image projection device of claim 6, wherein a gray scale is achieved by changing the scanning speed of the micromirror array lens.

17. The pocket-sized two-dimensional image projection device of claim 6, wherein a gray scale is achieved by varying the number of micromirrors of each micromirror array lenses.

18. The pocket-sized two-dimensional image projection device of claim 6, wherein a gray scale is achieved by changing the number of micromirror array lenses simultaneously focused at a point on the projection surface.

19. The pocket-sized two-dimensional image projection device of claim 6, wherein a gray scale is achieved by changing the scanning speeds and sizes of the micromirror array lenses.

20. The pocket-sized two-dimensional image projection device of claim 1, wherein each micromirror has three degrees-of-freedom motion.

21. The pocket-sized two-dimensional image projection device of claim 6, wherein the device identifies defective micromirrors and re-calibrates the device by excluding the defective micromirrors and adjusting the combination of micromirror array lenses and respective speeds to scan the projection surface.

22. The pocket-sized two-dimensional image projection device of claim 1, further comprising:

a light source that generates collimated light, wherein the light is reflected by the array of micromirror array lenses and focused at a point in space;

a projection surface for displaying an image, wherein the light reflected by a micromirror array lens or the array of micromirror array lenses is focused onto projection surface;

an image sensor comprising a photo detector that detects light spots on the projection surface, the image sensor generating an data signal comprising image data;

an image processor in communication with the image sensor, wherein the image processor receives the data signal sent by the image sensor; and

a controller that generates and sends to each the micromirror array lenses an control signal comprising control data to adjust the configuration of the micromirror array lenses.

23. The pocket-sized two-dimensional image projection device of claim 22, wherein the focused light corresponds to a pixel of a displayed image.

24. The pocket-sized two-dimensional image projection device of claim 1, wherein the projection device uses automatic focusing signal processing.

25. The pocket-sized two-dimensional image projection device of claim 1, further comprising:

a light source that produces collimated light, wherein the light is deflected by a micromirror array lens or the array of micromirror array lenses and focused at a point in space; and

a projection surface for displaying an image, wherein the light deflected by one micromirror array lens or array of micromirror array lens is focused onto the projection plane and an image is displayed;

26. The image projector of claim 25, further comprising:

an image sensor comprising a photo detector that detects scattered light from the image, wherein the image sensor generates a data signal comprising image data;

an image processor in communication with the image sensor, wherein the image processor receives the data signal sent by the image sensor, analyzes the image data, and generates a status signal comprising image focusing status data; and

a random scanning processing unit in communication with the image processor, wherein the random scanning processing unit receives the status signal sent by the image processor, and generates a control signal that is sent to the array of micromirror array lenses to adjust the focus of each micromirror array lens.

27. The pocket-sized two-dimensional image projection device of claim 1, wherein the projection device uses a method of random scanning technique;

comprising;

analyzing brightness of a frame;

analyzing brightness of each pixel;

calculating exposure time and intensity;

optimizing the construction of micromirror array lens;

generating control command; and

driving each micromirror array lens;

28. The pocket-sized two-dimensional image projection device of claim 1, wherein the projection device uses a method of self diagnosis and correction;

comprising;

identifying defective micromirrors;

re-calibrating by excluding the defective micromirrors; and

adjusting the combination of micromirror array lenses and respective speeds to scan the projection surface;

29. The pocket-sized two-dimensional image projection device of claim 1, wherein the projection device uses a method of focusing light at a point on a projection surface;

comprising;

generating light from a light source;

providing an array of micromirror array lenses comprising a plurality of micromirrors which reflect and focus the light onto the projection surface, wherein the focused light corresponds to a pixel of a displayed image;

receiving an image signal comprising image data, wherein the image data is transmitted to a processing unit and the processing unit sends an optimized control signal to the array of micromirror array lenses to adjust the focus of each micromirror array lenses;

detecting light scattered from the displayed image to generate a data signal carrying image data;

analyzing the data signal to produce a status signal carrying image focusing status data; and

processing the image focusing status data to produce a control signal that is sent to the array of micromirror array lenses to adjust the focusing of each of the micromirror lenses in the array.

30. The method of claim 29, wherein the optimized control signal carries data to produce the most optimized set of micromirror array lens combinations.

31. The pocket-sized two-dimensional image projection device of claim 1, wherein the projection device uses a method of displaying an image on a projection surface, comprising:

generating light from a light source;

providing an array of micromirror array lenses comprising a plurality of micromirrors which reflect and focus the light onto the projection surface, wherein the focused light corresponds to a pixel of the displayed image;

receiving an image signal comprising image data, wherein the image data is transmitted to a processing unit and the processing unit sends a control signal to the array of micromirror array lenses to adjust the focus of each micromirror array lenses; and

focusing the light randomly at certain positions corresponding to the image data along the projection surface where the image is displayed.

32. The pocket-sized two-dimensional image projection device of claim 1, wherein the portable device is a mobile phone.

33. The pocket-sized two-dimensional image projection device of claim 1, wherein the portable device is a personal digital assistant.

34. The pocket-sized two-dimensional image projection device of claim 1, wherein the portable device is a camcorder.

35. The pocket-sized two-dimensional image projection device of claim 1, wherein the portable device is a camera.

36. The pocket-sized two-dimensional image projection device of claim 1, wherein the portable device is an organizer.

37. The pocket-sized two-dimensional image projection device of claim 1, wherein the portable device is a portable DVD player.

38. The pocket-sized two-dimensional image projection device of claim 1, wherein the portable device is a laptop computer.