Appeal 2006-3013
Application 10/367,849
c) the Examiner has properly established that one skilled in the art
would combine the teachings of Dingwall and Kawaguchi.
FINDINGS OF FACT
1. Dingwall teaches a circuit for driving a column of pixels in a display
using organic light emitting diodes (O-LEDs). (Abstract).
2. Dingwall’s circuit has scan lines (lines titled ROW_1, ROW_2, etc.),
data lines (lines titled COL1, COL2, etc) and power feed lines (lines
titled VDD). Fig. 2, column. 4, lines 47-56.
3. At the intersection of each of the row and column lines (claimed scan
and data lines) is a pixel circuit. The pixel circuit consists of two
transistors a capacitor and O-LED (e.g. pixel P1 consists, of transistor
T1, TR1, C1 and an O-LED). Dingwall, Fig 2.
4. Each column (i.e. the claimed data line) also contains a reference
pixel, or dummy pixel circuit. The reference pixel circuit contains a
transistor and O-LED and is appended to the last pixel circuit in the
column. Dingwall, Fig, 2 (items 212, PR), column 4, lines 57-60.
5. The reference pixel is used to establish the proper current for each
pixel circuit in the column. The pixel circuits for the other pixels in
the column mirror (via a current mirror) the current on the column line
(claimed data line), i.e., the current draw from the power line by the
other pixel circuits mirrors the current draw of the reference pixel
circuit. Dingwall, column 4, lines 65-67, column 5, lines 11, 24.
6. The Web page (www.hardwarebook.info/PCB_trace) discusses a
design rule (standard) IPC-2221 and Mil-STD-275, which identifies
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