Drive circuit containing amplifier circuit
An amplifier circuit includes an operational amplifier having first and second input nodes and one output node which is connected to a data line for which a pixel is provided; a feedback circuit having first and second elements which are connected to one of the first and second input nodes at their one ends; and a first switch section. The first switch section switches an operation mode between a first drive mode in which the other end of the first element is connected to the output node and a second drive mode in which the other end of the second element is connected to the output node.
1. An amplifier circuit comprising:
an amplifier having first and second input nodes and one output node; and
a feedback circuit including at least a first element and a second element and first, second, third, and fourth switches,
wherein:
one end of said first and second elements is connected directly with said first input node,
the other end of said first element is connected with one end of said first and second switches,
the other end of said second element is connected with one end of said third and fourth switches,
the other end of said first and third switches is connected with said output node when said first and third switches are on,
the other end of said second and fourth switches is connected with a first wiring when said second and fourth switches are on,
said second and third switches are off when said first and fourth switches are turned on in a first drive mode,
said first and fourth switches are off when said second and third switch are turned on in a second drive mode, and
said first drive mode and said second drive mode are periodically switched.
2. The amplifier circuit according to claim 1 , wherein said first element is designed to have a same resistance value as that of said second element.
3. The amplifier circuit according to claim 1 , wherein said first element is designed to have a same capacitance value as that of said second element.
4. The amplifier circuit according to claim 1 , further comprising:
a fifth switch disposed between said output node and a data line of a display panel, wherein said fifth switch is turned off during switching between said first drive mode and said second drive mode.
5. The amplifier circuit according to claim 1 ,
wherein a reference voltage is supplied to said first wiring, and
a gradation voltage, which is selected based on image data, is supplied to said second input node.
6. The amplifier circuit according to claim 1 , wherein a gradation voltage selected based on image data is supplied to said first wiring, and a reference voltage is supplied to said second input node.
7. The amplifier circuit according to claim 5 , further comprising:
a sixth switch connected to a first voltage source, and
a seventh switch connected to a second voltage source,
wherein said sixth and seventh switches selectively connects one of said first and second voltage sources to said first wiring, respectively.
8. The amplifier circuit according to claim 6 , further comprising:
a sixth switch connected with a first voltage source; and
a seventh switch connected with a second voltage source,
wherein said sixth and seventh switches selectively connect said second input node with said first voltage source and said second voltage source, respectively.
9. A drive circuit comprising:
an amplifier circuit;
a data latch section, configured to latch a display data; and
a D/A converting section configured to supply a gradation voltage to said amplifier circuit based on the display data,
wherein said amplifier circuit drives a display panel based on the gradation voltage,
said amplifier circuit comprises:
an amplifier having first and second input nodes and one output node;
a feedback circuit including at least a first element and a second element and first, second, third, and fourth switches,
wherein:
one end of said first and second elements is connected directly with said first input node,
the other end of said first element is connected with one end of said first and second switches,
the other end of said second element is connected with one end of said third and fourth switches,
the other end of said first and third switches is connected with said output node when said first and third switches are on,
the other end of said second and fourth switches is connected with a first wiring when said second and fourth switches are on,
said second and third switches are off when said first and fourth switches are turned on in a first drive mode,
said first and fourth switches are off when said second and third switch are turned on in a second drive mode, and
said first drive mode and said second drive mode are periodically switched.
10. The drive circuit according to claim 9 , wherein said first element is designed to have a same resistance value as that of said second element.
11. The drive circuit according to claim 9 , wherein said first element is designed to have a same capacitance value as that of said second element.
12. The drive circuit according to claim 9 , wherein said amplifier circuit further comprises:
a fifth switch disposed between said output node and a data line of a display panel, wherein said fifth switch is turned off during switching between said first drive mode and said second drive mode.
13. The drive circuit according to claim 9 , wherein a reference voltage is supplied to said first wiring, and a gradation voltage which is selected based on image data is supplied to said second input node.
14. The drive circuit according to claim 9 , wherein a gradation voltage selected based on image data is supplied to said first wiring, and a reference voltage is supplied to said second input node.
15. The drive circuit according to claim 13 , wherein said amplifier circuit further comprises:
a sixth switch connected to a first voltage source; and
a seventh switch connected to a second voltage source,
wherein said sixth and seventh switches selectively connect one of said first and second voltage sources to said first wiring, respectively.