Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2007-10-02
2007-10-02
Lee, Wilson (Department: 2163)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S092000, C315S169300
Reexamination Certificate
active
09983479
ABSTRACT:
A method of driving a display device capable of obtaining a luminance of constant level irrespective of temperature change is provided. A change in luminance of an EL element due to temperature change is prevented by controlling the luminance of the EL element with current instead of voltage. Specifically, a TFT for controlling the amount of current flowing into the EL element is operated in a saturation range. Then a current value IDSof the TFT is hardly changed by VDS but is determined solely by VGS. Accordingly, the amount of current flowing in the EL element is kept constant by setting VGSto such a value as to make the current value IDSconstant. The luminance of the EL element is substantially in proportion to the amount of current flowing through the EL element, and a change in luminance of the EL element upon temperature change can thus be prevented.
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Lee Wilson
Semiconductor Energy Laboratory Co,. Ltd.
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