Imaging system with light valve and photodetector

• US 4,603,356 A
• Filed: 03/19/1984
• Issued: 07/29/1986
• Est. Priority Date: 03/19/1984
• Status: Expired due to Term

• Current Assignee: Energy Conversion Devices
• Original Assignee: Energy Conversion Devices
• Inventors: Bates, Richard D.
• Primary Examiner(s): Rubinson, Gene Z.
• Assistant Examiner(s): Brinich, Stephen
• Application Number:
  US06/590,941
• Time in Patent Office: 862 Days
• Field of Search: 250/578, 358/225, 358/209, 358/213, 350/333, 350/342, 350/345, 350/357
• US Class Current: 348/367
• CPC Class Codes: H04N 25/71 Charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors
• CPC Class Codes: H04N 25/713 Transfer or readout registers; Split readout registers or multiple readout registers
• CPC Class Codes: H04N 25/76 Addressed sensors, e.g. MOS or CMOS sensors
• CPC Class Codes: H04N 3/15 for picture signal generation

Abstract

Disclosed is an image detection system having a photodetector, e.g. a photovoltaic cell, a photoconductor sheet, and a means, e.g., a liquid crystal light valve or an electrochromic light valve, matrix light valve having a plurality of individually addressable light valve cells. The image detection system also has means to identify the signal generated by the photodetector with the individual light cell switched to a light transmissive mode. Also disclosed is a method of detecting and updating an image using the image detection system.

Claims

1. Image detection means comprising:

(a) photodetector means for generating a signal responsive to light incident thereon; and

(b) matrix light valve means having a plurality of individually addressable, volatile, light valve cells, the matrix light valve means being optically and operatively in series with and between the incident light and the photodetector means, electrically insulated from the photodetector means, and having a higher resolution then the photodetector means.

2. The image detection means of claim 1 wherein the photodetector means comprises a photovoltaic cell generating a voltage signal when exposed to light.

3. The image detection means of claim 1 wherein the photodetector means comprises a photoconductor.

4. The image detection means of claim 1 wherein the matrix light valve means is a liquid crystal light valve means.

5. The image detection means of claim 1 wherein the matrix light valve means is an electrochromic light valve means.

6. The image detection means of claim 1 further comprising means for encoding the photodetector means signal versus the individually addressable, volatile light valve cell address.

7. The image detection means of claim 6 further comprising means for decoding the encoded image.

8. The image detection means of claim 7 further comprising means for switching the image detection means between image detection and image display modes.

9. A method of detecting an image with an image detection means comprising photodetector means and light valve means, the light valve means being between the image and the photodetector means, said method comprising the steps of:

(a) forming the image on matrix light valve means formed of a plurality of individually addressable, volatile, light valve cells;

(b) maintaining said individually addressable light valve cells in a non-light transmissive state;

(c) sequentially switching an individual light valve cell from a non-transmissive to a transmissive state whereby to permit generation of a signal responsive to the transmitted light;

encoding the signal versus the address of the switched, light transmissive cell;

thereafter switching the individual light valve cell from a transmissive state to a non-transmissive state; and

(d) thereafter repeating step (c) at a subsequent individual light valve cell.

10. The method of claim 9 wherein the photodetector is a photovoltaic cell and the signal generated is a voltage signal.

11. The method of claim 9 wherein the photodetector is a photoconductor.

12. The method of claim 9 wherein the matrix light valve means has a higher resolution than the photodetector.

13. The method of claim 9 comprising periodically switching said matrix light valve means and photodetector means to a display means.

14. The method of claim 9 comprising switching said matrix light valve means and photodetector means to a display means, switching said matrix display means to a matrix light valve means and photodetector means, inputting an image, and switching said matrix light valve means and photodetector means to a matrix display means displaying said inputted image.

15. The method of claim 9 wherein the matrix light valve means in a liquid crystal light valve means.

16. The method of claim 9 wherein the matrix light valve means in an electrochromic light valve means.

17. An electronic photographic system comprising:

(a) image focusing means;

(b) image detection means comprising;

(i) photodetector means generating a signal responsive to incident light thereon; and

(ii) light valve means having a plurality of individually addressable, volatile light valve cells optically and operatively in series with and between the focused image and the photodetector means, and having a higher resolution then the photodetector means; and

(c) means for storing the signal versus the light valve cell address.

18. The electronic photographic systems of claim 17 wherein the photodetector means comprises a photovoltaic cell generating a voltage signal when exposed to light.

19. The electronic photographic system of claim 17 wherein the photodetector means comprises a photoconductor.

20. The electronic photographic system of claim 17 wherein the light valve means is a liquid crystal light valve means.

21. The electronic photographic system of claim 17 wherein the light valve means is an electrochromic light valve means.

22. A method of electronic photography comprising the steps of:

(a) bringing an image to focus on an image detection means comprising;

(1) a signal responsive to incident light thereon; and

(2) light valve means having a plurality of individually addressable, volatile, light valve cells optically and operatively in series with and between the focused image and the photodetector means and having a higher resolution then the photodetector means;

(b) maintaining the individually addressable light valve cells in a non-transmissive state;

(c) sequentially switching an individual light valve cell from a non-transmissive state to a transmissive state whereby to permit generation of a signal responsive to the transmitted light;

encoding and storing the signal versus the address of the switched, light transmissive cell;

thereafter switching the individual light valve cell from a transmissive state to a non-transmissive state;

;

and

(d) thereafter repeating step (c) at a subsequent individual light valve cell.

23. The method of claim 22 comprising scanning the image detection means in a still photographic process.

24. The method of claim 22 comprising scanning the image detection means, and thereafter again scanning the image detection means in a motion picture photographic process.

25. The method of claim 22 wherein the photodetector is a photovoltaic cell and the signal generated in a voltage signal.

26. The method of claim 22 wherein the photodetector is a photoconductor.

27. The method of claim 22 wherein the light valve means is a liquid crystal light valve means.

28. The method of claim 22 wherein the light valve means is an electrochromic light valve means.

29. A data entry and display system comprising:

(a) photodetector means for generating a signal responsive to light incident thereon

(b) matrix light valve means having a plurality of individually addressable cells, the individual cells being switchable between

(1) a light valve mode of operation having light transmitting and light non-transmitting states; and

(2) a display mode of operation;

said matrix light valve means being optically and operatively between the photodetector means and an incident light, and having a higher resolution then the photodetector means

(c) means for encoding, storing, and decoding the signal versus the individual cell address.

30. The data entry and display system of claim 29 wherein the phnotodetector means comprises a photovoltaic cell generating a voltage signal when exposed to light.

31. The data entry and display system of claim 29 wherein the photodetector means comprises a photoconductor.

32. The data entry and display system of claim 29 wherein the individual cells of the matrix light valve means are liquid crystal cells.

33. The data entry and display system of claim 32 wherein the individual cells are switchable between light transmissive and light dispersive modes.

34. The data entry and display system of claim 29 wherein the individual cells of the matrix light valve means are electrochromic cells.

35. The data entry and display system of claim 34 wherein the individual cells are switchable between light transmissive and light blocking modes.

36. A method of data entry and display with (1) an image detection means comprising photodetector means and matrix light valve means, the light valve means being between the image and the photodetector means and comprising a plurality of individually addressable cells, said cells being switchable between a data entry mode having light transmissive and non-light transmissive modes, and a data display means, and (2) encoding, storage, and decoding means, which method comprises the steps of:

(a) forming the image on the matrix light valve means in a data entry mode;

(b) maintaining the individually addressable cells in a non-light transmissive state;

(c) sequentially switching an individual cell from a non-light transmissive state to a light transmissive state whereby to permit generation of a signal by the photodetector means responsive to incident light thereon;

encoding the signal versus the address of the switched, light transmissive cell;

thereafter switching the individual light valve cell from a light transmissive state to a non-light transmissive state;

(d) thereafter repeating step (c) at a subsequent individual light valve cell; and

(e) periodically switching said matrix from a data entry mode to a data display mode.

37. The data entry and display method of claim 36 wherein the photodetector means comprises a photovoltaic cell generating a voltage signal when exposed to light.

38. The data entry and display method of claim 36 wherein the photodetector means comprises a photoconductor.

39. The data entry and display method of claim 36 wherein the individual cells of the matrix light valve means are liquid crystal cells.

40. The data entry and display method of claim 39 wherein the individual cells are switchable between light transmissive and light dispersive states modes.

41. The data entry and display method of claim 36 wherein the individual cells of the matrix light valve means are electrochromic cells.

42. The data entry and display method of claim 41 wherein the individual cells are switchable between light transmissive and light blocking modes.