Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2007-08-28
2007-08-28
Chow, Dennis-Doon (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S211000, C315S169300
Reexamination Certificate
active
10785809
ABSTRACT:
In a conventional EL display device, a general video signal (analog signal voltage) is sampled to be outputted to a source signal line and then inputted to a gate electrode of a driving TFT provided in each pixel. The drain current of the TFT is controlled to control the current flowing into an EL element, thereby adjusting the luminance. However, accurate gray scales cannot be obtained unless the video signal is converted before it is sampled and inputted to the source signal line since the drain current of the driving TFT does not correspond to the gate voltage of the driving TFT linearly. The invention solve this problem by converting an inputted analog signal voltage into a current, converting the current into the gate-source voltage of a correction TFT that has the same polarity as a driving TFT, supplying the gate-source voltage as a source line signal to a source signal line, and applying the source line signal to a gate electrode of the driving TFT. Thus an EL element can emit light at a luminance linearly corresponding to the inputted analog signal voltage.
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Kimura Hajime
Koyama Jun
Chow Dennis-Doon
Cook Alex McFarron Manzo Cummings & Mehler, Ltd.
Semiconductor Energy Laboratory Co,. Ltd.
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