Shift Register Unit for AMOLED Scanning Driving Circuit
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Solution Overview
Problem
Existing active matrix organic light-emitting diode (AMOLED) display devices face issues with inaccurate output of light-emitting control signals due to the reduction of transistors in the output circuit and excessive transistors connected to voltage lines, leading to inefficiencies in the scanning driving circuit.
Innovation Solution
A shift register unit is designed with an output terminal, output circuit, and output node control circuit, where the output circuit writes voltage signals from different voltage lines into the output terminal under controlled node potentials, and the output node control circuit manages these potentials using distinct clock and voltage signals to ensure accurate light-emitting control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of transistors in the output circuit is reduced, then the device complexity is decreased, but the output precision of light-emitting control signals deteriorates
Solution Approach 1:
The shift register unit is divided into multiple functional modules: output circuit module, output node control circuit module, input circuit module, and input node control circuit module. Each module has specific transistors dedicated to its function, preventing interference between different circuits while maintaining signal precision with fewer total transistors.
Solution Approach 2:
Different voltage lines (first voltage line, second voltage line, third voltage line) are assigned to different functional regions. The output circuit uses voltages from the first and second voltage lines, while the output node control circuit uses voltages from the third voltage line, ensuring each region operates with optimal voltage characteristics for its specific function.
2Reliability
If excessive transistors are connected to voltage lines, then the reliability of voltage supply is improved, but the device complexity increases
Solution Approach 1:
The voltage supply system is segmented into multiple independent voltage lines (first voltage line, second voltage line, third voltage line), each serving specific circuits. This segmentation ensures reliable voltage supply to each function while avoiding the need for excessive transistors connected to a single voltage line.
Solution Approach 2:
The output node control circuit acts as an intermediary between the input circuit and output circuit, using the third voltage line to control the potentials of output nodes. This intermediary structure manages voltage distribution efficiently without requiring excessive direct connections from all circuits to all voltage lines.
3Productivity
If the shift register unit design is optimized for fewer transistors, then the productivity of the display device is improved, but the reliability of light-emitting control signal output may deteriorate
Solution Approach 1:
The circuit is segmented into specialized modules with dedicated transistors for each function. This segmentation reduces total transistor count (improving productivity) while ensuring each module has sufficient transistors to maintain its specific function reliably.
Solution Approach 2:
The circuit uses multiple different voltage levels (first voltage, second voltage, third voltage) to control transistor states and signal levels. By changing voltage parameters rather than relying solely on transistor quantity, the design achieves reliable signal output with fewer transistors.
Data Source
AI summary
A shift register unit, a scanning driving circuit, a display substrate and a display device. The shift register unit includes an output terminal, an output circuit and an output node control circuit. The output circuit is electrically coupled to a first output node, a second output node, a first voltage line, a second voltage line and the output terminal, respectively. The output node control circuit is electrically coupled to the first output node, the second output node, a third voltage line, a fourth voltage line, a fifth voltage line, a first clock signal line, a second clock signal line and an input terminal, respectively. At least one of a third voltage signal, a fourth voltage signal and a fifth voltage signal is different from a first voltage signal and ae second voltage signal.