Compact document imager

• US 5,920,401 A
• Filed: 12/11/1995
• Issued: 07/06/1999
• Est. Priority Date: 12/29/1993
• Status: Expired due to Term

• Current Assignee: Thomson Licensing (Vantiva SA)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Fennell, Leonard Eugene, Nelson, Steven Edward, Street, Robert A., Fujieda, Ichiro
• Primary Examiner(s): Lee, Thomas D.
• Application Number:
  US08/570,193
• Time in Patent Office: 1,303 Days
• Field of Search: 358/473, 358/475, 358/476, 358/471, 358/400, 358/482, 358/513, 178/18, 178/19, 178/20, 378/98.2, 345/87, 345/44, 345/179, 345/76, 345/104, 345/182, 345/7-9, 359/72
• US Class Current: 358/400
• CPC Class Codes: H04N 1/00127 Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture
• CPC Class Codes: H04N 1/00129 with a display device, e.g. CRT or LCD monitor with a television apparatus H04N1/00283; arrangements for control of display devices G09G
• CPC Class Codes: H04N 1/00525 Providing a more compact apparatus, e.g. sheet discharge tray in cover
• CPC Class Codes: H04N 1/024 Details of scanning heads ; Means for illuminating the original
• CPC Class Codes: H04N 1/02805 with photodetectors arranged in a two-dimensional array
• CPC Class Codes: H04N 1/195 the array comprising a two-dimensional array or a combination of two-dimensional arrays
• CPC Class Codes: H04N 2201/043 Viewing the scanned area
• CPC Class Codes: H04N 2201/0436 Scanning a picture-bearing surface lying face up on a support H04N2201/0434 takes precedence; using cylindrical picture bearing surfaces H04N1/06; with manual scanning H04N1/107

Abstract

The compact document imager and display apparatus has a two-dimensional image sensor array, a flat panel display such as a liquid crystal display (LCD), and processing electronics. An illumination source can be added to illuminate the document on the sensor array and to provide backlight for the LCD. Color imaging may be achieved by providing three sequential illumination pulses of appropriate colors. A document is placed in close contact with the sensor array. The document is illuminated and an electronic image is captured and stored in the processing electronics. The captured image can be displayed on the LCD by the processing electronics. The document, such as a single sheet of paper or a transparency, can be illuminated by the room light to perform image capture. The compact document imager can be used as a facsimile machines by providing telephone connections. Documents can be scanned using the sensor array and sent to other devices. Documents can be received from other sources and displayed on the LCD. A light-pen can be used to generate handwritten documents or highlight portions of documents. An X-ray imaging device is created by placing a thin phosphor sheet in contact with the sensor array. The x-ray imaging device is placed over an object illuminated by X-rays and the image produced by the glowing phosphorous is stored and displayed by the LCD.

Claims

1. A compact document imager for inputting and displaying an image comprising:

an image sensor array for sensing light and dark portions of an input image to read the input image, the image sensor array generating electrical signals representing the input image;

a flat panel display for displaying an output image;

an illuminator, sandwiched between the image sensor array and the flat panel display, for illuminating an input image placed adjacent a first side of the image sensor array, light from the input image being sensed by the image sensor array, the illuminator also illuminating the flat panel display to display output images; and

a processor for receiving the electrical signals from the image sensor array and for controlling the flat panel display to display an output image on the flat panel display.

2. The compact document imager of claim 1, wherein the processor enlarges the input image before displaying an output image on the display.

3. The compact document imager of claim 1, wherein the image sensor array has a plurality of photosensitive elements for sensing light from the input image.

4. The compact document imager of claim 3, wherein each photosensitive element comprises an amorphous semiconductor photodiode and a thin film transistor.

5. The compact document imager of claim 3, further comprising a plurality of light shields, wherein a light shield is located between each photosensitive element and the illuminator to block direct light from the illuminator.

6. The compact document imager of claim 3, further comprising a plurality of microlenses, wherein a microlens is located between each photosensitive element and the input image to focus scattered light from the input image toward the photosensitive elements.

7. The compact document imager of claim 1, wherein the flat panel display comprises a liquid crystal display, and wherein the liquid crystal display comprises:

liquid crystal material;

a first substrate forming a clear glass plate;

a second substrate forming a clear glass plate, the first and second substrates being spaced apart to hold the liquid crystal material;

a first transparent electrode located on the first substrate;

a second transparent electrode located on the second substrate, the first and second transparent electrodes selectively applying an electrical field across the liquid crystal material;

a first polarizer attached to the first substrate, the first polarizer allowing polarized light to pass therethrough; and

a second polarizer attached to the second substrate, the second polarizer allowing polarized light to pass therethrough, wherein application of the electrical field across the liquid crystal material controls the amount of light passing through both the first and second polarizers.

8. The compact document imager of claim 1, wherein the image is a color image, and the compact document imager further comprises a diffuser for diffusing colored light evenly across the color image, the illuminator producing at least one colored light.

9. The compact document imager of claim 8, wherein the diffuser is sandwiched between the illuminator and the image sensor array.

10. The compact document imager of claim 8, wherein the illuminator is mounted adjacent to the diffuser.

11. The compact document imager of claim 1, wherein the image sensor array includes color filters for detecting color images.

12. The compact document imager of claim 1, wherein the image sensor array extends over a first two-dimensional planer area equivalent to a size of the input image, wherein the image sensor array comprises a plurality of photosensitive elements, each of the photosensitive elements extending over a portion of the first planer area, the photosensitive elements blocking only a small portion of light rays passing through the image sensor array, wherein the flat panel display extends over a second two-dimensional area equivalent to the size of the input image, the flat panel display comprising a plurality of pixels, each of the pixels extending over a portion of the second planer area, the second planer area being substantially parallel to and aligned with the first planer area, and wherein each one of the plurality of photosensitive elements is substantially aligned with at least a portion of a corresponding one of the plurality of pixels.

13. The compact document imager of claim 12, wherein the illuminator illuminates an input image adjacent the first side of the image sensor array, the photosensitive elements detecting light reflected from the input image.

14. The compact document imager of claim 13, further comprising a plurality of light shields, wherein a light shield is located between each photosensitive element and the illuminator to block direct light from the illuminator.

15. The compact document imager of claim 12, wherein the processor enlarges or reduces the input image before displaying the output image on the flat panel display.

16. A compact facsimile apparatus, comprising:

an image sensor array for sensing light and dark portions of an input image to read the input image and for generating electrical signals representing the input image;

a flat panel display for displaying an output image;

an illuminator, sandwiched between the image sensor array and the flat panel display, for illuminating an image placed adjacent a first side of the image sensor array, light from the input image being sensed by the image sensor array, the illuminator also illuminating the flat panel display to display output images; and

a processor for receiving the electrical signals from the image sensor array, for controlling the flat panel display to display an output image on the flat panel display, for storing images, and for configuring data to send to and to receive from a telephone connection.

17. The compact facsimile apparatus of claim 16, wherein the image sensor array faces downward so that the input image may be read by placing the input image underneath the compact facsimile apparatus, and wherein the flat panel display faces upward for display of output images.

18. The compact facsimile apparatus of claim 16, wherein the image sensor array comprises a plurality of photosensitive elements for sensing light from the image.

19. The compact facsimile apparatus of claim 18, further comprising a plurality of light shields, wherein a light shield is located between each photosensitive element and the illuminator to block direct light from the illuminator.

20. The compact facsimile apparatus of claim 18, further comprising a plurality of microlenses, wherein a microlens is located between each photosensitive element and an input image being read by the image sensor array to focus scattered light from the input image toward the photosensitive elements.

21. The compact facsimile apparatus of claim 16, wherein the flat panel display comprises a liquid crystal display, and wherein the liquid crystal display comprises:

liquid crystal material;

a first substrate forming a clear glass plate;

a second substrate forming a clear glass plate, the first and second substrates being spaced apart by at most 10 microns and containing the liquid crystal material;

a first transparent electrode located on the first substrate;

a second transparent electrode located on the second substrate, the first and second transparent electrodes selectively applying an electrical field across the liquid crystal material;

a first polarizer attached to the first substrate, the first polarizer allowing polarized light to pass therethrough; and

a second polarizer attached to the second substrate, the second polarizer allowing polarized light to pass therethrough, wherein application of the electrical field across the liquid crystal material controls the amount of light passing through both the first and second polarizers.

22. The compact facsimile apparatus of claim 16, wherein the input image is a color image, and the compact facsimile apparatus further comprises a diffuser for diffusing input colored light evenly across the color image, the illuminator producing at least one colored light.

23. The compact facsimile apparatus of claim 22, wherein the diffuser is sandwiched between the illuminator and the image sensor array.

24. The compact facsimile apparatus of claim 22, wherein the illuminator is mounted adjacent to the diffuser.

25. The compact facsimile apparatus of claim 16, wherein the image sensor array includes color filters for detecting color images.