Shift Register With Shared Pull-Down Circuit For OLED Gate Drive
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Solution Overview
Problem
Existing OLED gate drive circuits are complex and inefficient, requiring multiple sub-circuits that occupy significant space and fail to meet high resolution and narrow frame requirements.
Innovation Solution
A shift register design comprising two interconnected shift register units with a shared pull-down circuit, which simplifies the circuit structure, reduces space, and enables efficient output signal control through unidirectional isolation and clock signal synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three sub-circuits (detection unit, display unit, connection unit) are used in OLED gate drive circuits, then the circuit can perform detection and display functions, but the circuit structure becomes complex and occupies significant space
Solution Approach 1:
The patent combines the detection unit and display unit into a single integrated shift register circuit. The same shift register units that generate display signals also perform detection functions by monitoring voltage levels during operation, eliminating the need for separate detection sub-circuits and reducing overall circuit complexity
Solution Approach 2:
The shift register units are designed to serve multiple functions: they generate gate drive signals for display, perform detection of voltage anomalies, and enable narrow frame operations. This multi-functionality reduces the need for dedicated separate circuits for each function
2Adaptability or versatility
If three sub-circuits are used in OLED gate drive circuits, then the circuit can perform detection and display functions, but the occupied space increases
Solution Approach 1:
The patent merges detection and display functions into a single integrated circuit structure, significantly reducing the occupied area. The shift register units share circuit elements between detection and display operations, eliminating redundant components and minimizing space requirements
Solution Approach 2:
The circuit is divided into modular shift register units that can be efficiently packed. Each unit is self-contained and performs multiple functions, allowing for compact arrangement and reduced overall circuit area while maintaining full detection and display capabilities
3Reliability
If traditional OLED gate drive circuits are used, then the circuit structure is well-established, but the efficiency and compactness are insufficient for high resolution and narrow frame requirements
Solution Approach 1:
The patent implements dynamic control within the shift register units, allowing them to adapt their operation mode between detection and display functions. This dynamic capability enables the circuit to achieve high efficiency and compactness while maintaining reliability through proven shift register architecture
Solution Approach 2:
The circuit utilizes variable clock signals and control parameters to optimize performance for different operating modes. By changing operational parameters rather than structural configuration, the circuit maintains reliability while achieving the efficiency and compactness needed for high resolution and narrow frame displays
Data Source
AI summary
A shift register comprises a first shift register unit and a second shift register unit. The first shift register unit comprises a first input circuit connected to a first input terminal and a first pull-up node, a first output circuit connected to the first pull-up node, a first output terminal and a first clock terminal, and a first pull-down circuit. The second shift register unit comprises a second input circuit connected to a second input terminal and a second pull-up node, and a second output circuit connected to the second pull-up node, a second output terminal and a second clock signal.