Shift Register Unit Transistor Reduction for Thin Frame Displays
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Solution Overview
Problem
Existing display devices with high-resolution Thin Film Transistor-Liquid Crystal Display (TFT-LCD) face challenges in reducing the number of transistors in the Gate Driver on Array (GOA) circuit, which complicates the structure and hinders further miniaturization and efficiency.
Innovation Solution
A shift register unit with a simplified structure, comprising an inputting module, first and second outputting modules, and a connection node, which reduces the number of functional modules and transistors, enabling bi-directional scanning and a thin frame design while maintaining stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each stage of shift register unit comprises a plurality of functional modules (pulling-up module, pulling-down module, control module, inputting module) to realize precise controlling of gate driving signals, then the controlling precision is improved, but the device complexity increases and the number of transistors increases
Solution Approach 1:
The patent combines multiple functional modules (pulling-up module, pulling-down module, control module, and inputting module) into a simplified shift register unit structure. By merging these functions into a more integrated design, the patent reduces the overall number of transistors while maintaining the essential controlling capabilities, thus resolving the contradiction between controlling precision and device complexity.
Solution Approach 2:
The patent designs the shift register unit with multi-functional components that can perform multiple operations. The inputting module is configured to receive different types of input signals (scan signals, reset signals, bidirectional control signals) and the output modules can function in different modes (pulling-up, pulling-down, buffering), allowing a single structure to fulfill multiple controlling functions without requiring separate dedicated modules for each function.
2Reliability
If each stage of shift register unit comprises a plurality of functional modules with multiple transistors to achieve precise controlling, then the reliability of gate driving signals is improved, but the number of transistors increases which hinders thin frame design
Solution Approach 1:
The patent merges the functions of multiple transistors into a more compact arrangement. By combining the pulling-up, pulling-down, control, and inputting functions into an integrated structure with fewer transistors, the patent maintains signal reliability while reducing the total transistor count, thereby enabling thin frame design in display devices.
Solution Approach 2:
The patent employs a simplified circuit structure that reduces the physical footprint of the shift register unit. This compact design allows for thinner display device frames while maintaining adequate spacing and connectivity, effectively applying the principle of reducing structural thickness without compromising functional reliability.
3Measurement precision
If the GOA circuit uses traditional design with multiple functional modules, then the gate driving signals can be precisely controlled, but the bonding area and periphery wiring space increase which affects produce capacity and yield
Solution Approach 1:
The patent integrates multiple functional modules into a compact shift register unit structure, significantly reducing the bonding area and periphery wiring space required. This merged design maintains precise control of gate driving signals while minimizing the space occupied, thereby increasing produce capacity and yield by allowing more units to be manufactured per panel area.
Solution Approach 2:
The patent segments the gate driving circuit into modular shift register units that can be efficiently arranged and bonded. By dividing the overall circuit into standardized, compact units with reduced periphery wiring, the patent facilitates higher density packaging and improves manufacturing efficiency, directly enhancing produce capacity.
4Device complexity
If the shift register unit structure is simplified to reduce the number of transistors, then the thin frame design is enabled, but the controlling precision of each stage may be compromised
Solution Approach 1:
The patent employs multi-functional transistors and modules within the simplified structure. Each component is designed to perform multiple functions (e.g., the inputting module handles both scan signal input and reset signal input; the output modules can pull-up, pull-down, or buffer signals), allowing the reduced transistor count to maintain adequate controlling precision through efficient resource utilization.
Solution Approach 2:
The patent optimizes the electrical parameters (such as transistor size, threshold voltage, and connectivity configuration) of the simplified structure to compensate for the reduced number of components. By carefully adjusting these parameters, the patent maintains the necessary controlling precision despite the simplified architecture, ensuring that signal integrity and timing are preserved.
Data Source
AI summary
The present disclosure relates to the technical field of display. Provided are a shift register unit, a gate driving circuit and a display apparatus, the shift register unit includes an inputting module, a first outputting module and a second outputting module. As compared with the prior art, the structure of the shift register unit can be simplified effectively, and the number of use of the transistors can be further reduced. Embodiments of the present disclosure are used to implement scanning and driving.