Driving circuit for display apparatus

Claim 2

A driving circuit for driving a display apparatus which includes pixels and data lines for applying voltages to said pixels and which displays an image with multiple gray scales in accordance with video data consisting of a plurality of bits, said driving circuit comprising: oscillating voltage specifying means for specifying one of a plurality of oscillating signals having respective duty ratios which are different from each other in accordance with video data consisting of bits selected from said plurality of bits, and for outputting said specified oscillating signal T and an oscillating signal T which is obtained by inverting said specified oscillating signal T; gray-scale voltage specifying means for producing gray-scale voltage specifying signals which specify a first gray-scale voltage and a second gray-scale voltage among a plurality of gray-scale voltages supplied from gray-scale voltage supply means, in accordance with video data consisting of bits other than said selected bits of said plurality of bits; and output means for outputting said first gray-scale voltage and said second gray-scale voltage specified by said gray-scale voltage specifying signals to said data lines, in accordance with said oscillating signal T and said oscillating signal T.

Claim 3

A driving circuit according to claim 1, wherein said first gray-scale voltage and said second gray-scale voltage are adjacent ones of said plurality of gray-scale voltages.

Claim 4

A driving circuit according to claim 1, wherein said plurality of oscillating signals include oscillating signals having duty ratios of 8:0, 7:1, 6:2, 5:3, 4:4, 3:5, 2:6, and 1:7, respectively.

Claim 5

A driving circuit for driving a display apparatus which includes pixels and data lines for applying voltages to said pixels and which displays an image with multiple gray scales in accordance with video data consisting of a plurality of bits, said driving circuit comprising: control signal generating means for generating a plurality of control signals in accordance with video data consisting of a plurality of bits; and a plurality of switching means, each of said plurality of switching means being supplied with a corresponding one of said plurality of control signals and a corresponding one of a plurality of gray-scale voltages generated by gray-scale voltage generating means, said gray-scale voltage supplied to said switching means being output to said data lines via said switching means in accordance with said control signal, wherein said control signal generating means includes: oscillating voltage specifying means for specifying one of a plurality of oscillating signals having respective duty ratios which are different from each other in accordance with video data consisting of bits selected from said plurality of bits, and for outputting said specified oscillating signal T and an oscillating signal T which is obtained by inverting said specified oscillating signal T; gray-scale voltage specifying means for producing gray-scale voltage specifying signals which specify a first gray-scale voltage and a second gray-scale voltage among said plurality of gray-scale voltages, in accordance with video data consisting of bits other than said selected bits of said plurality of bits; and output means for outputting a first control signal which oscillates at substantially the same duty ratio as that of said oscillating signal T to one of said switching means which is supplied with said first gray-scale voltage specified by said gray-scale voltage specifying signals and for outputting a second control signal which oscillates at substantially the same duty ratio as that of said oscillating signal T to one of said switching means which is supplied with said second gray-scale voltage specified by said gray-scale voltage specifying signals.

Claim 6

A driving circuit for driving a display apparatus which includes pixels and data lines for applying voltages to said pixels and which displays an image with multiple gray scales in accordance with video data consisting of a plurality of bits, said driving circuit comprising: control signal generating means for generating a plurality of control signals in accordance with video data consisting of a plurality of bits; and a plurality of switching means, each of said plurality of switching means being supplied with a corresponding one of said plurality of control signals and a corresponding one of a plurality of gray-scale voltages generated by gray-scale voltage generating means, said gray-scale voltage supplied to said switching means being output to said data lines via said switching means in accordance with said control signal, wherein said control signal generating means includes: oscillating voltage specifying means for specifying one of a plurality of oscillating signals having respective duty ratios which are different from each other in accordance with video data consisting of bits selected from said plurality of bits, and for outputting said specified oscillating signal T and an oscillating signal T which is obtained by inverting said specified oscillating signal T; gray-scale voltage specifying means for producing gray-scale voltage specifying signals which specify a first gray-scale voltage and a second gray-scale voltage among said plurality of gray-scale voltages, in accordance with video data consisting of bits other than said selected bits of said plurality of bits; and output means for outputting a first control signal which oscillates at substantially the same duty ratio as that of said oscillating signal T to one of said switching means which is supplied with said first gray-scale voltage specified by said gray-scale voltage specifying signals and for outputting a second control signal which oscillates at substantially the same duty ratio as that of said oscillating signal T to one of said switching means which is supplied with said second gray-scale voltage specified by said gray-scale voltage specifying signals.

Claim 7

A driving circuit according to claim 4, wherein said first gray-scale voltage and said second gray-scale voltage are adjacent ones of said plurality of gray-scale voltages.

Claim 8

A driving circuit according to claim 4, wherein said plurality of oscillating signals include oscillating signals having duty ratios of 8:0, 7:1, 6:2, 5:3, 4:4, 3:5, 2:6, and 1:7, respectively.

Claim 9

A driving circuit according to claim 4, wherein said switching means is an analog switch.