Liquid crystal display device with influences of offset voltages reduced
View Patent ↗A liquid crystal display device includes drain signal lines, gate signal lines, thin film transistors, and a drain driver. The drain driver includes an amplifier circuit having a switching circuit which switches between a first state and a second state, the first state being a state where a first input terminal of the amplifier circuit is coupled to an inverting input terminal and a second input terminal is coupled to a noninverting input terminal, and the second state being a state where the first input terminal is coupled to the noninverting input terminal and the second input terminal is coupled to the inverting input terminal. The amplifier circuit supplies signal voltages to the thin film transistors via the drain signal lines which are gray scale voltages one of plus and minus offset voltages in a first frame and in a second frame.
1. A liquid crystal display device including a plurality of drain signal lines, a plurality of gate signal lines arranged to intersect said plurality of drain signal lines, and a plurality of thin film transistors disposed in vicinities of intersections of said plurality of drain signal lines and said plurality of gate signal lines and coupled to corresponding ones of said plurality of drain signal lines and said plurality of gate signal lines, and a drain driver which supplies signal voltages to said plurality of drain signal lines, said drain driver comprising:
an amplifier circuit which outputs a signal voltage to a corresponding one of said plurality of drain signal lines;
wherein said amplifier circuit includes a switching circuit which switches between a first state and a second state, said first state being a state where a first input terminal of said amplifier circuit is coupled to an inverting input terminal and a second input terminal is coupled to a noninverting input terminal, and said second state being a state where said first input terminal is coupled to said noninverting input terminal and said second input terminal is coupled to said inverting input terminal; and
wherein said signal voltages supplied to said plurality of thin film transistors coupled to a given one of said plurality of gate signal lines, via said plurality of drain signal lines are gray scale voltages one of plus and minus offset voltages in a first frame, and are gray scale voltages one of plus and minus said offset voltage in a second frame.
2. A liquid crystal display device according to claim 1 , wherein said signal voltages supplied to said plurality of thin film transistors coupled to a first one of said plurality of gate signal lines, adjacent to said given one of said plurality of gate signal lines, via said plurality of drain signal lines are gray scale voltages plus said offset voltages in said first frame, and are gray scale voltages minus said offset voltage in said second frame.
3. A liquid crystal display device according to claim 1 , wherein said signal voltages supplied to said plurality of thin film transistors coupled to a first one of said plurality of gate signal lines, adjacent to said given one of said plurality of gate signal lines, via said plurality of drain signal lines are gray scale voltages minus said offset voltages in said first frame, and are gray scale voltages plus said offset voltage in said second frame.
4. A video signal line driving circuit including an amplifier circuit which outputs a drive voltage to a video signal line,
wherein said amplifier circuit includes a switching circuit which switches between a first state and a second state, said first state being a state where a first input terminal of said amplifier circuit is coupled to an inverting input terminal and a second input terminal is coupled to a noninverting input terminal, and said second state being a state where said first input terminal is coupled to said noninverting input terminal and said second input terminal is coupled to said inverting input terminal, and
wherein said drive voltage supplied to said video signal line and corresponding to a first line in a first frame is a gray scale voltage one of plus and minus an offset voltage, and said drive voltage supplied to said video signal line and corresponding to said first line in a second frame is a gray scale voltage one of plus and minus said offset voltage.
5. A video signal line driving circuit according to claim 4 , wherein said drive voltage supplied to said video signal line and corresponding to a second line in said first frame is a gray scale voltage plus said offset voltage, and said drive voltage supplied to said video signal line and corresponding to said second line in said second frame is a gray scale voltage minus said offset voltage.
6. A video signal line driving circuit according to claim 4 , wherein said drive voltage supplied to said video signal line and corresponding to a second line in said first frame is a gray scale voltage minus said offset voltage, and said drive voltage supplied to said video signal line and corresponding to said second line in said second frame is a gray scale voltage plus said offset voltage.