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US 2013/0173870 A1Published application
Bidirectional shift register and the driving method thereof
AssigneeAu Optronics Corporation
InventorsChien-Chang TSENG, Kuang-Hsiang Liu, Yu-Hsin Ting
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Abstract
A bidirectional shift register includes a first register circuit and a second register circuit. The first register circuit includes a first register stage and a first output buffer stage with n numbers of scanning signal output ends. The first register stage is electrically coupled to a third voltage source. The first output buffer stage is electrically coupled to a second voltage source and a first voltage source. The second register circuit has a similar circuit structure to the first register circuit; wherein the first register circuit and the second register circuit each use n+1 numbers clock signal lines, and the n is a positive integer.
Claims16
A bidirectional shift register, comprising:
- a first register circuit comprising:
- a first register stage having a first end, a second end and an output end, wherein the first end of the first register stage is electrically coupled to an output end of a second register stage of a previous-stage bidirectional register shift register, the first register stage is configured to receive a first control signal, a second control signal and an end stage clock signal, the first register stage is electrically coupled to a third voltage source;
- and
- a first output buffer stage electrically coupled to the first register stage and having a first end, a second end and n numbers of scanning signal output ends, wherein the first end of the first output buffer stage is electrically coupled to the first end of the first register stage, the second end of the first output buffer stage is electrically coupled to the second end of the first register stage, the first output buffer stage is further electrically coupled to a first voltage source and a second voltage source;
- and
- a second register circuit comprising:
- a second register stage having a first end, a second end and an output end, wherein the first end of the second register stage is electrically coupled to the output end of the first register stage, the second end of the second register stage is electrically coupled to an output end of a first register stage of a next-stage bidirectional shift register, the output end of the second register stage is electrically coupled to the second end of the first register stage and a first end of the first register stage of the next-stage bidirectional shift register, the second register stage is configured to receive the first control signal, the second control signal and a complementary end stage clock signal, the second register stage is further electrically coupled to the third voltage source;
- and
- a second output buffer stage electrically coupled to the second register stage and having a first end, a second end and n numbers of scanning signal output ends, wherein the first end of the second output buffer stage is electrically coupled to the first end of the second register stage, the second end of the second output buffer stage is electrically coupled to the second end of the second register stage, the second output buffer stage is further electrically coupled to the first voltage source and the second voltage source;
- wherein the first register circuit and the second register circuit each use n+1 numbers of clock signal lines, and n is a positive integer.
7 more elements
A bidirectional shift register, comprising:
- a register stage having a first end and a second end, wherein the first end of the register stage is electrically coupled an output end of a previous-stage register, the second end of the register stage is electrically coupled to a first end of a next-stage register, the register stage is configured to receive a first control signal, a second control signal and an end stage clock signal, the register stage is further electrically coupled to a third voltage source, and the register stage uses one clock signal line;
- and
- an output buffer stage electrically coupled to the register stage and having a first end, a second end and a scanning signal output end, wherein the first end of the output buffer stage is electrically coupled to the first end of the register stage, the second end of the output buffer stage is electrically coupled to the second end of the register stage, the output buffer stage is electrically coupled to a first voltage source and a second voltage source.
A driving method of a bidirectional shift register for driving a plurality of bidirectional shift registers therein, each bidirectional shift register comprising a first register circuit and a second register circuit, the driving method comprising:
- providing a first voltage source, a second voltage source, a third voltage source, a first control signal and a second control signal;
- defining the first register circuit into a first register stage and a first output buffer stage with n numbers of scanning signal output ends, and defining the second register circuit into a second register stage and a second output buffer stage with n numbers of scanning signal output ends;
- and
- electrically coupling the first end of the first register stage to the output end of the second register stage of a previous-stage bidirectional shift register;
- electrically coupling the first register stage to the third voltage source;
- configuring the first register stage to receive the first control signal, the second control signal and a complementary nth clock signal;
- electrically coupling the first end of the first output buffer stage to the first end of the first register stage;
- electrically coupling the second end of the first output buffer stage to the second end of the first register stage;
- electrically coupling the first output buffer stage to the second voltage and the first voltage source;
- electrically coupling the first end of the second register stage to the output end of the first register stage;
- electrically coupling the second end of the second register stage to the output end of the first register of a next-stage bidirectional shift register;
- electrically coupling the second register stage to the third voltage source;
- configuring the second register stage to receive the first control signal, the second control signal and a nth clock signal;
- electrically coupling the first end of the second output buffer stage to the first end of the second register stage;
- electrically coupling the second end of the second output buffer stage to the second end of the first register stage;
- electrically coupling the output end of the second register stage to the second end of the first register stage and the first end of the first register stage of the next-stage bidirectional shift register;
- electrically coupling the second output buffer stage to the second voltage source and the first voltage source;
- wherein the first register circuit and the second register circuit each use n+1 numbers of clock signal lines, and n is a positive integer.
15 more elements
Dependencies are inferred from the claim text.