Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2008-11-17
2011-11-22
Liang, Regina (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S082000
Reexamination Certificate
active
08063859
ABSTRACT:
In a light emitting device, luminance irregularities caused by fluctuation in threshold of TFTs for supplying a current to EL elements among pixels hinder the light emitting device from improving the image quality. A voltage equal to the threshold of a TFT110is held in capacitor means111in advance. When a video signal is inputted from a source signal line, the voltage held in the capacitor means is added to the signal, which is then applied to a gate electrode of the TFT110. Even when threshold is fluctuated among pixels, each threshold is held in the capacitor means111of each pixel, and therefore, influence of the threshold fluctuation can be removed. Since the threshold is stored in the capacitor means111alone and the voltage between two electrodes is not changed while a video signal is written, fluctuation in capacitance value has no influence.
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Fish & Richardson P.C.
Liang Regina
Semiconductor Energy Laboratory Co,. Ltd.
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