Shift Register Unit Reduces TFT Count in Display Driving Circuits
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Solution Overview
Problem
The existing strobe driving circuits for liquid crystal displays require a large number of thin-film transistors (TFTs), leading to complex wiring and increased power consumption, which complicates the design and increases production costs.
Innovation Solution
A shift register unit with an inputting module, pulling-up module, pulling-down module, and resetting module, connected through specific clock signal terminals, reduces the number of TFTs required and simplifies wiring by using clock signals to control the pulling-down operation without a separate pulling-down control module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate pulling-down control unit is added to control the pulling-down operation of the shift register, then the control precision is improved, but the device complexity increases due to the large number of TFTs required
Solution Approach 1:
The patent merges the pulling-down control function with the existing clock signal system. The third clock signal terminal CLK3 is used to control both the pulling-down operation and the timing of the shift register, eliminating the need for a separate pulling-down control unit and its associated TFTs.
Solution Approach 2:
The clock signal system is given multi-functional capability. The third clock signal terminal CLK3 serves dual purposes: it controls the pulling-down operation of the shift register and synchronizes the timing of the circuit operations, thereby reducing the total number of control terminals and TFTs required.
2Reliability
If more TFTs are used to implement the pulling-down control unit, then the reliability is improved, but the power consumption increases
Solution Approach 1:
The patent combines the pulling-down control function with the existing clock signal-driven TFTs. By using the third clock signal terminal CLK3 to control the pulling-down operation, the patent eliminates the need for additional TFTs that would otherwise be required for a separate control unit, thereby reducing power consumption while maintaining reliability.
3Measurement precision
If a separate pulling-down control unit is implemented, then the control precision is improved, but the ease of manufacture deteriorates due to complicated wiring
Solution Approach 1:
The patent merges the pulling-down control functionality into the existing clock signal distribution network. By using the third clock signal terminal CLK3 that is already present in the shift register structure, the patent avoids the need for additional wiring and control units, thereby simplifying the manufacturing process while maintaining precise control.
4Ease of manufacture
If the number of TFTs is reduced, then the ease of manufacture is improved, but the control precision may deteriorate
Solution Approach 1:
The patent makes the third clock signal terminal CLK3 multi-functional, using it to control both the pulling-down operation and the timing synchronization. This approach maintains precise control over the shift register's pulling-down operation while reducing the total number of TFTs and simplifying the circuit structure.
Data Source
AI summary
There are provided a shift register unit, a strobe driving circuit, a display apparatus and a driving method for the shift register unit. The shift register unit comprises: an inputting module (10) configured to control a potential of the pulling-up control node according to a signal of the first signal input terminal; a pulling-up module (20) configured to output a present stage output signal from the present stage output terminal according to a signal of the second clock signal terminal and the potential of the pulling-up control node; a pulling-down module (30) configured to pull down the potential of the pulling-up control node and the signal of the present stage output terminal to a low level according to a signal of the third clock signal terminal; a resetting module (40) configured to reset the potential of the pulling-up control node according to a signal of the second signal input terminal and pull down the signal of the present stage output terminal to a low level. Correspondingly, the pulling-down operation of the shift register unit is implemented in a simple manner, so that a number of TFTs as required, power consumption and wiring are reduced.