D/A converter and liquid crystal display device

Details D/A converter and liquid crystal display device D/A converter and liquid crystal display device

2007-09-27

2009-02-24

Nguyen, Khai M (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S136000, C341S144000, C341S150000, C345S089000, C345S095000, C345S098000, C345S100000

Reexamination Certificate

active

07495594

ABSTRACT:
A D/A converter with reduced power consumption is offered by reducing an amount of electric charges that is charged and discharged as D/A conversion is performed. A terminal of each of four capacitors C1, C2, C3and C4is connected to a common node. The capacitors C1, C2, C3and C4have capacitances C, C, 2C and 4C, respectively. A selection circuit SEL is provided with selection transistors ST1, ST2, ST3, ST4, ST5and ST6, and selects and outputs either a first reference electric potential V1or a second electric potential V2according to a value of each bit of the digital signals D0, D1and D2. Each of transfer transistors TT1, TT2and TT3transfers each of outputs of the selection circuit SEL to another terminal of corresponding each of the capacitors C2, C3and C4, respectively, in response to a start pulse STP. Each of reset transistors RT1, RT2, RT3and RT4connects the terminal with the other terminal of corresponding each of the capacitors C1, C2, C3and C4, and applies the first reference electric potential V1to both the terminal and the other terminal in response to a reset pulse RST.

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