Appeal No. 95-4788
Application 07/996,393
a reference voltage V1 to determine the amplification factor of the driver 22 and, thus, the
amplitude of the driving pulse signals to the solid state image sensor 10" (specification, page 4,
lines 20-23).
Howard discloses a method for eliminating crosstalk due to capacitive coupling in a thin
film transistor/liquid crystal display (TFT/LCD). A matrix of liquid crystal cells is controlled by
means of an x-y array of thin film transistors, one per cell, which can be switched on, a row at a
time to control the charge on the row of liquid crystal electrodes. As each row of transistors is
turned on by a pulse applied to the gate lines, the voltages of vertical data electrodes are
transferred to cell capacitors. Crosstalk can occur by capacitive coupling between the data
electrodes 22 and 24 and the transparent liquid crystal electrode 26 (figure 2). In conventional
operation, the row gate electrodes are strobed in sequence, each being activated once per frame
T, for an interval of approximately T/N, where N is the number of rows in the display (column 3,
lines 55-58). Each column electrode then has a repetitive sequence of voltages V applied to it,
i
each for a time interval T/N in synchronization with the gate pulses (column 3, lines 59-61).
Because of this serial sequence of data voltages, a given liquid crystal cell capacitor will be
subjected to a fraction of all the voltages in the column in sequence, with the fraction depending
on the size of the coupling capacitor relative to the cell capacitance (column 3, lines 27-34).
Howard applies the gate pulse for a fraction of the line time T/N, e.g., T/2N and changes
the sequence of data line voltages applied to the source electrode 38 in figure 3 to V , V -V , V ,i M i i+1
V -V , etc., where V is a fixed voltage (which could be zero) (column 3, lines 61-68). ThisM i+1 M
- 3 -
Page: Previous 1 2 3 4 5 6 7 8 9 10 Next
Last modified: November 3, 2007