Semiconductor device

Details Semiconductor device Semiconductor device

2004-08-06

2011-12-27

Wang, Quan-Zhen (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S076000, C345S077000, C345S089000, C345S204000, C345S690000, C315S169100, C315S169300

Reexamination Certificate

active

08085226

ABSTRACT:
A semiconductor device with a transistor for supplying a current to a pixel comprising an EL element, that can supply an accurate current without the influence of variations even when a small signal current, is provided. A precharge voltage is supplied in advance for the current supply to a pixel and subsequently, the signal writing is completed quickly. The precharge voltage is outputted from a circuit for supplying voltage and current that supplies a current to a current source circuit for supplying a current to the pixel. As the precharge voltage, a gate voltage of a transistor for supplying a current to the current source circuit is supplied to the pixel. Optimum precharge voltage can be supplied in the case where W/L of a transistor in the pixel and W/L of a transistor for supplying current in the circuit for supplying voltage and current are approximately equivalent to each other.

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M. Shimoda et al.; “New Pixel-Driving Scheme with Data-Line Pre-Charge Function for Active Matrix Organic Light Emitting Diode Displays”;IDW '02; pp. 239-242; (2002).

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