Color scan array with addressing circuitry

• US 5,119,183 A
• Filed: 08/09/1991
• Issued: 06/02/1992
• Est. Priority Date: 08/09/1991
• Status: Expired due to Term

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Fennell, Leonard E., Turner, William D., Weisfield, Richard L.
• Primary Examiner(s): Britton, Howard W.
• Application Number:
  US07/742,964
• Time in Patent Office: 298 Days
• Field of Search: 358/75, 358/41, 358/213.29, 358/213.23, 358/213.26, 358/482, 358/483
• US Class Current: 358/505
• CPC Class Codes: H01L 27/14645 Colour imagers
• CPC Class Codes: H04N 1/486 with separate detectors, each detector being used for one specific colour component
• CPC Class Codes: H04N 25/617 for reducing electromagnetic interference, e.g. clocking noise
• CPC Class Codes: H04N 25/7013 using abutted sensors forming a long line
• CPC Class Codes: H04N 25/76 Addressed sensors, e.g. MOS or CMOS sensors
• CPC Class Codes: H04N 25/779 Circuitry for scanning or addressing the pixel array
• CPC Class Codes: H04N 3/1512 for MOS image-sensors, e.g. MOS-CCD H04N3/1581 takes precedence
• CPC Class Codes: H04N 3/1581 using linear image-sensor

Abstract

A color scan array for linear imaging employing a matrix of photo-sensor and thin-film transistor (TFT) elements aligned in parallel rows with each row representing the same color and sub-pixels of a linear array of pixels. The rows of sub-pixels are sub-divided into groups, with the TFT of each color group commonly connected to a data line, and with plural gate lines provided each connected to the corresponding TFTs of the sub-pixels of each group pixel. The result is a short, compact sensor with a relatively small number of crossings and thus reduced capacitance and increased responsivity.

Claims

1. A matrix-driven color scan array comprising:

(a) a linear arrangement of p imaging pixel elements extending along a given length direction,

(b) each of said imaging pixel elements comprising a set of s sub-pixel elements each representing different color components,

(c) each sub-pixel element comprising a photo-sensor element and a switch connected to the photo-sensor element and having at least first and second electrodes which must be selected to address the sub-pixel element,

(d) said sub-pixel elements being arranged in s rows extending parallel to the given length direction,

(e) the sub-pixel elements of each set constituting one pixel element being arranged in parallel columns,

(f) means associated with the sub-pixels elements in each row for rendering them sensitive to the same color component,

(g) said sub-pixels elements along a row being subdivided into m/s groups of n sub-pixel elements,

(h) means for interconnecting the first electrodes of each group of sub-pixel elements in a row to form m data line connection points,

(i) means for interconnecting the second electrodes of each column of sub-pixel elements,

(j) m data lines,

(k) means for connecting each of the data line connection points to one of the m data lines,

(l) n drive lines,

(m) means for connecting the second electrode interconnection means of each column of sub-pixel elements of each group of sub-pixel elements to one of the n drive lines, whereby activation of each drive line will prepare all sub-pixel elements in one set of each group for selection, and activation of each data line will prepare all sub-pixel elements in the same row and in the same group for selection.

2. A matrix-driven color scan array as claimed in claim 1, wherein the n drive lines form a bus extending parallel to the given length direction.

3. A matrix-driven color scan array as claimed in claim 2, wherein the n drive lines extend adjacent the rows of sub-pixel elements.

4. A matrix-driven color scan array as claimed in claim 3, wherein the m drive lines extend directly from the data line connection points across the drive line bus to the edge of the array.

5. A matrix-driven color scan array as claimed in claim 4, wherein s=3, p equals about 4800, n equals about 20, and m equals about 720.

6. A matrix-driven color scan array as claimed in claim 4, wherein m is in the range of hundreds, and n is in the range of tens.

7. A matrix-driven color scan array as claimed in claim 6, wherein the photo-sensors comprise photodiodes, the switches comprise TFTs having first, second and third electrodes, the first and third electrodes being main electrodes, the second electrode being a gate electrode.

8. A matrix-driven color scan array as claimed in claim 7, wherein the TFTs are oriented with their long width dimension extending parallel to the array'"'"'s length dimension.

9. A matrix-driven color scan array as claimed in claim 7, further comprising a carrier for the array, means on the carrier for generating selection signals for and connected to the drive lines, means on the carrier for reading data signals and connected to the data lines.