Appeal No. 97-2020
Application 07/957,107
called a simple matrix structure. Appellants point out
problems which
arise with this type of display device in that optical on/off
switching operations are difficult to obtain intermediate
brightness or color tone. On page 3 of the specification,
Appellants disclose that this problem has been solved in the
prior art by installing a switching element at each pixel
element of the display device. Appellants state that this
type of device is called an active matrix display.
On pages 3 and 4 of the Appellants' specification,
Appellants point out the problems of an active display device
are that these devices have difficulty in achieving an
implementation of the gradation displaying operation. In
particular, Appellants disclose that it is not easy to
generate a voltage with a resolution of 300 microvolts or
less, and such a minute voltage is attenuated by various
factors until it reaches a picture element. These factors
contain resistance of wirings, resistance of thin film
transistors, reduction of the potential of a picture element
8
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