PIXEL CIRCUIT AND DISPLAY DEVICE
First Claim
1. A pixel circuit comprising:
- a display element part including a unit display element;
an internal node composing a part of the display element part, for holding a pixel data voltage applied to the display element part;
a first switch circuit for transferring the pixel data voltage supplied from a data signal line to the internal node through at least a predetermined switch element;
a second switch circuit for transferring a voltage supplied from the data signal line to the internal node without passing through the predetermined switch element; and
a control circuit for holding a predetermined voltage depending on the pixel data voltage held by the internal node at one end of a first capacitive element, and controlling ON/OFF of the second switch circuit, whereinthe second switch circuit is a series circuit comprising a first transistor element having a first terminal, a second terminal, and a control terminal for controlling connection between the first and second terminals, and a diode element,the control circuit is a series circuit comprising a second transistor element having a first terminal, a second terminal, and a control terminal for controlling connection between the first and second terminals, and the first capacitive element,one end of each of the first and second switch circuits is connected to the data signal line,the other end of each of the first and second switch circuits, and the first terminal of the second transistor element are connected to the internal node,the diode element has a rectifying function from the data signal line to the internal node,the control terminal of the first transistor element, the second terminal of the second transistor element, and one end of the first capacitive element are connected to each other to form an output node of the control circuit,the control terminal of the second transistor element is connected to a first control line, andthe other end of the first capacitive element is connected to a second control line.
1 Assignment
0 Petitions
Accused Products
Abstract
A display device in which low power consumption is realized without lowering an aperture ratio is provided. A liquid crystal capacitive element Clc is sandwiched between a pixel electrode 20 and an opposite electrode 80. The pixel electrode 20, one end of a first switch circuit 22, one end of a second switch circuit 23 and a first terminal of a second transistor T2 form an internal node N1. The other terminals of the first switch circuit 22 and the second switch circuit 23 are connected to a source line SL. The second switch circuit 23 is a series circuit composed of a first transistor T1 and a diode D1. A control terminal of the first transistor T1, a second terminal of the second transistor T2 and one end of a boost capacitive element Cbst form an output node N2. The other end of the boost capacitive element Cbst and the control terminal of the second transistor T2 are connected to a boost line BST and a reference line REF, respectively. The diode D1 has a rectifying function from the source line SL to the internal node N1.
18 Citations
36 Claims
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1. A pixel circuit comprising:
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a display element part including a unit display element; an internal node composing a part of the display element part, for holding a pixel data voltage applied to the display element part; a first switch circuit for transferring the pixel data voltage supplied from a data signal line to the internal node through at least a predetermined switch element; a second switch circuit for transferring a voltage supplied from the data signal line to the internal node without passing through the predetermined switch element; and a control circuit for holding a predetermined voltage depending on the pixel data voltage held by the internal node at one end of a first capacitive element, and controlling ON/OFF of the second switch circuit, wherein the second switch circuit is a series circuit comprising a first transistor element having a first terminal, a second terminal, and a control terminal for controlling connection between the first and second terminals, and a diode element, the control circuit is a series circuit comprising a second transistor element having a first terminal, a second terminal, and a control terminal for controlling connection between the first and second terminals, and the first capacitive element, one end of each of the first and second switch circuits is connected to the data signal line, the other end of each of the first and second switch circuits, and the first terminal of the second transistor element are connected to the internal node, the diode element has a rectifying function from the data signal line to the internal node, the control terminal of the first transistor element, the second terminal of the second transistor element, and one end of the first capacitive element are connected to each other to form an output node of the control circuit, the control terminal of the second transistor element is connected to a first control line, and the other end of the first capacitive element is connected to a second control line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification