Liquid crystal display device with influences of offset voltages reduced
View Patent ↗A semiconductor integrated circuit includes a first register which latches display data, a second register which latches the display data of the first register in accordance with a first clock, a gray scale voltage generator which outputs a plurality of gray scale voltages, a decoder which selects a gray scale voltage in accordance with the display data of the second register from the plurality of gray scale voltages, and an amplifier including a first transistor, and a second transistor. A first terminal of the first transistor and a first terminal of the second transistor are connected to a first voltage line, and the gray scale voltage outputted from the decoder is supplied to one of input terminals of the first transistor and the second transistor in accordance with a control signal. A phase of the control signal is reversed at intervals of two frame periods.
1. A semiconductor integrated circuit comprising:
a first register which latches display data;
a second register which latches the display data of the first register in accordance with a first clock;
a gray scale voltage generator which outputs a plurality of gray scale voltages;
a decoder which selects a gray scale voltage in accordance with the display data of the second register from the plurality of gray scale voltages; and
an amplifier including a first transistor, and a second transistor;
wherein a first terminal of the first transistor and a first terminal of the second transistor are connected to a first voltage line, and the gray scale voltage outputted from the decoder is supplied to one of input terminals of the first transistor and the second transistor in accordance with a control signal, and
wherein a phase of the control signal is reversed at intervals of two frame periods.
2. A semiconductor integrated circuit according to claim 1 , wherein an output of the amplifier is supplied to other input terminals of the first transistor and the second transistor.
3. A semiconductor integrated circuit according to claim 2 , wherein the first transistor and the second transistor are PMOS transistors.
4. A semiconductor integrated circuit according to claim 3 , wherein the phase of the control signal is reversed at intervals of two cycles of the first clock and the two frame periods.
5. A semiconductor integrated circuit according to claim 1 , wherein the control signal is generated from a frame recognizing signal for recognizing each frame.
6. A semiconductor integrated circuit according to claim 5 , wherein the frame recognizing signal is generated in the semiconductor integrated circuit.
7. A semiconductor integrated circuit according to claim 6 , wherein an output of the amplifier is supplied to other input terminals of the first transistor and the second transistor.
8. A semiconductor integrated circuit according to claim 7 , wherein the phase of the control signal is reversed at intervals of two cycles of the first clock and the two frame periods.
9. A semiconductor integrated circuit comprising:
a first register which latches display data;
a second register which latches the display data of the first register in accordance with a first clock;
a decoder which selects a gray scale voltage in accordance with the display data of the second register;
an amplifier which amplifies the gray scale voltage;
wherein the semiconductor integrated circuit generates a signal for recognizing each frame, and does not have an input pin which receives a signal that instruct a frame start.