Shift Register Circuit Bidirectional Discharge Modules
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Solution Overview
Problem
Conventional bidirectional shift register circuits in display panels, especially those using a-Si thin-film transistors, face issues with threshold voltage shifts affecting operation and requiring additional dummy gate drivers, leading to reliability problems and challenges in achieving ultra-high definition and slim borders.
Innovation Solution
A novel shift register circuit design integrates two gate driving modules with two discharging modules, each comprising ten transistors, allowing simultaneous discharge to both gate driving circuits, reducing the number of discharging circuits from four to two, and controlling bidirectional gate driving signal waveforms to eliminate the need for dummy gate drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional bidirectional shift register circuit uses four separate discharging circuits (11, 12, 13, 14) to discharge gate driving circuits, then the voltage level stability is improved, but the layout area increases and the circuit complexity increases
Solution Approach 1:
The patent merges the four separate discharging circuits into two integrated discharging modules. Each discharging module contains two discharge control units that can simultaneously discharge to two different gate driving circuits. This consolidation reduces the total number of discharging circuits from four to two, thereby reducing layout area while maintaining the voltage level stability function through coordinated discharge control.
Solution Approach 2:
Each discharging module is designed with multi-functionality to serve multiple gate driving circuits. The discharge control units within each module can selectively discharge to different gate driving circuits based on control signals, allowing a single discharging module to perform the function previously requiring two separate discharging circuits.
2Ease of manufacture
If a-Si thin-film transistors are used in the bidirectional shift register circuit, then the manufacturing process is simpler and cost is reduced, but the threshold voltage shifts with increasing use time affecting circuit operation
Solution Approach 1:
The patent implements compensation mechanisms that anticipate and counteract threshold voltage shifts before they cause circuit failure. The discharge control units are designed to adjust discharge timing and duration based on detected voltage levels, compensating for threshold voltage drift in a-Si thin-film transistors over time. This beforehand cushioning approach maintains circuit reliability while preserving the manufacturing advantages of a-Si technology.
Solution Approach 2:
The patent incorporates feedback mechanisms where the discharge control units continuously monitor the voltage levels of gate driving circuits and adjust their discharge operations accordingly. This feedback loop compensates for threshold voltage shifts in a-Si thin-film transistors by dynamically adjusting discharge parameters, thereby maintaining reliable circuit operation despite the inherent threshold voltage drift of a-Si devices.
3Manufacturing precision
If dummy gate drivers are added to achieve ultra high definition and slim border, then the display quality is improved, but the circuit reliability deteriorates
Solution Approach 1:
The patent extracts and eliminates the need for dummy gate drivers by implementing a bidirectional shift register circuit that can properly drive all gate lines including the last column without requiring additional dummy elements. The improved discharge control mechanism ensures proper voltage levels are maintained across all actual gate lines, making dummy gate drivers unnecessary and thereby improving circuit reliability while achieving ultra-high definition and slim border displays.
Data Source
AI summary
A shift register circuit is disclosed. The shift register circuit includes a first gate driving module, a second gate driving module, a first discharging module, and a second discharging module. The first gate driving module has a first node and a first output terminal. The second gate driving module has a second node and a second output terminal. The first discharging module is coupled to the first node, the second node, and the first output terminal respectively. The second discharging module is coupled to the second node, the first node, and the second output terminal respectively. Both the first discharging module and the second discharging module include ten transistors respectively.