Imaging device

• US 6,480,305 B1
• Filed: 05/25/1999
• Issued: 11/12/2002
• Est. Priority Date: 05/25/1999
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Resman, Mark F.
• Primary Examiner(s): Lee, Cheukfan
• Application Number:
  US09/318,596
• Time in Patent Office: 1,267 Days
• Field of Search: 358/482, 358/483, 358/475, 358/512, 358/514, 358/509, 250/208.1, 250/227.2, 382/312
• US Class Current: 358/482
• CPC Class Codes: H01L 27/14601 Structural or functional details thereof
• CPC Class Codes: H01L 27/14609 Pixel-elements with integrated switching, control, storage or amplification elements scanning details of imagers (circuitry of solid-state image sensors H04N25/00); circuitry of imagers H04N25/70
• CPC Class Codes: H01L 31/125 Composite devices with photosensitive elements and electroluminescent elements within one single body
• CPC Class Codes: H04N 1/028 for picture information pick-up
• CPC Class Codes: H04N 1/02805 with photodetectors arranged in a two-dimensional array
• CPC Class Codes: H04N 23/74 by influencing the scene brightness using illuminating means
• CPC Class Codes: H04N 25/00 Circuitry of solid-state image sensors [SSIS]; Control thereof

Abstract

An imaging device includes plurality of illumination elements interspersed among a plurality of light sensing elements so that each illumination element is adjacent to a light sensing element. The illumination elements each include a ferroelectric liquid crystal element positioned over a LED. The light sensing elements each include a photodiode. The illumination elements and the light sensing elements are arranged so that adjacent to each illumination element is a light sensing element. Illumination control logic can selectively illuminate each of the illumination elements. The light sensing elements are coupled to analog shift registers. The light sensing elements generate charges related to the intensity of the impinging light. Sensor control logic is used to load the charges generated by the light sensing elements corresponding to the illuminated illumination elements into the shift registers. The charge data in the shift registers is sequentially shifted to the input of an amplifier. The amplifier generates a voltage proportional to the value of the charge data.

Claims

1. A scanning device for forming an electronic representation of an image on an object, comprising:

an imaging device including a plurality of illumination elements and a plurality of light sensing elements, with the plurality of illumination elements interspersed among the plurality of light sensing elements and with the illumination elements and the light sensing elements existing substantially within a plane and with the imaging device configured to receive a signal to selectively illuminate the illumination elements and to selectively output data from the light sensing elements; and

a scanning mechanism coupled to the imaging device, with the scanning mechanism configured to generate the signal and arranged to receive the data.

2. The scanning device as recited in claim 1, wherein:

the plurality of illumination elements interspersed among the plurality of light sensing elements includes each of the illumination elements located adjacent to one of the light sensing elements.

3. The scanning device as recited in claim 2, wherein:

the imaging device includes an illumination element controller arranged to receive the signal and configured to selectively illuminate the illumination elements based upon the signal.

4. The scanning device as recited in claim 3, wherein:

the imaging device includes a light sensing element controller arranged to receive the signal and configured to selectively output the data from the light sensing elements based upon the signal.

5. The scanning device as recited in claim 4 wherein:

the imaging device includes a plurality of shift registers coupled to the light sensing elements and the light sensing element controller with the shift registers arranged to receive the data from the light sensing elements.

6. The scanning device as recited in claim 5 wherein:

the data includes charges generated by the light sensing elements.

7. The scanning device as recited in claim 6 wherein:

the light sensing elements each include a photodiode; and

the illumination elements each include a ferroelectric liquid crystal.

8. A method for forming an electronic representation of an image on an object using an imaging device including a plurality of illumination elements and a plurality of light sensing elements with the plurality of illumination elements interspersed among the plurality of light sensing elements and with the illumination elements and the light sensing elements existing substantially within a plane, comprising:

selectively illuminating at least one of the illumination elements to illuminate the object;

reflecting light from the object onto at least one of the light sensing elements; and

generating data from each of the light sensing elements receiving the light, with the data related to the light received by the light sensing elements; and

outputting the data from the light sensing elements receiving the light.

9. The method as recited in claim 8, further comprising:

receiving a signal with the imaging device before selectively illuminating the illumination elements.

10. With the imaging device including an illumination element controller coupled to the illumination elements, the method as recited in claim 9, wherein:

selectively illuminating the illumination elements includes selecting the illumination elements for illumination based upon the signal.

11. With the imaging device including a light sensing element controller, the method as recited in claim 10, wherein:

outputting the data from the light sensing elements receiving the light includes selecting the light sensing elements for outputting of the data based upon the signal.

12. The method as recited in claim 11, wherein:

generating data includes generating charges in the light sensing elements receiving the light.

13. The method as recited in claim 12, wherein:

the light sensing elements each include a photodiode; and

the illumination elements each include a ferroelectric liquid crystal.

14. An imaging device for generating data representing an image on an object, comprising:

a plurality of illumination elements for selectively illuminating the object; and

a plurality of light sensing elements, with the plurality of illumination elements interspersed among the plurality of light sensing elements so that the illumination elements and the light sensing elements exist substantially within a plane and with the illumination elements for receiving light reflected from the object and generating data based upon the light.

15. The imaging device as recited in claim 14, wherein:

the plurality of illumination elements interspersed among the plurality of light sensing elements includes each of the illumination elements located adjacent to one of the light sensing elements.

16. The imaging device as recited in claim 15, further comprising:

an illumination controller coupled to the illumination elements and arranged to receive a signal, with the illumination controller configured to selectively illuminate the illumination elements based upon the signal.

17. The imaging device as recited in claim 16, further comprising:

a light sensing element controller arranged to receive the signal and configured to selectively output the data from the light sensing elements based upon the signal, with the light sensing element controller arranged to receive the data output from the light sensing elements selected by the light sensing element controller.

18. The imaging device as recited in claim 17, further comprising:

a plurality of shift registers coupled to the light sensing elements and the light sensing element controller.

19. The imaging device as recited in claim 18, wherein:

the data includes charges generated by the light sensing elements.

20. The imaging device as recited in claim 19, wherein:

the light sensing elements each include a photodiode; and

the illumination elements each include a ferroelectric liquid crystal.