Shift Register Circuit for Narrow Display Frames
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Solution Overview
Problem
The challenge is to further narrow the frames of display products while maintaining the functionality of shift register unit circuits, as the simplification of internal circuit structures hinders the reduction of thin film transistors, thereby limiting the space compression of gate drivers.
Innovation Solution
The proposed solution involves a shift register unit circuit with an input sub-circuit, transmission sub-circuits, and output sub-circuits, where the input sub-circuit sets a first node to an effective level, transmission sub-circuits set output control nodes to an effective level, and output sub-circuits conduct clock signals to output terminals when the output control nodes are effective, reducing the number of transistors required and allowing for narrower frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the internal circuit structure of shift register unit circuit is simplified, then the transistor count is reduced, but the frame width cannot be further narrowed
Solution Approach 1:
The shift register unit circuit is divided into multiple functional sub-circuits (input sub-circuit, transmission sub-circuit, output sub-circuit) that can be independently optimized. Each sub-circuit performs a specific function, allowing for efficient space utilization and reduced overall circuit area while maintaining functionality.
Solution Approach 2:
The shift register unit circuit is designed to output multiple stages of signals (at least two stages) from a single unit, making it a multi-functional component. This reduces the total number of transistors needed compared to having separate circuits for each signal stage, thereby reducing transistor count while maintaining compact frame width.
2Length of moving object
If the frame width is narrowed, then the aesthetic degree is improved, but the circuit board space for gate driver is reduced
Solution Approach 1:
The circuit layout transitions from a conventional single-side arrangement to a dual-side symmetric arrangement on the display panel. The scanning drive circuit is disposed on both sides of the display panel, effectively utilizing the available space in a two-dimensional configuration. This allows for narrower frames while providing sufficient circuit board space for the gate driver functionality.
3Length of moving object
If the scanning drive circuit is disposed on both sides of display panel, then the frame width is reduced, but the circuit complexity increases
Solution Approach 1:
The patent employs asymmetric signal transmission paths where odd-number stages and even-number stages are transmitted in opposite directions from their respective sides. This asymmetric design allows for efficient utilization of the dual-side configuration while maintaining manageable circuit complexity through systematic signal routing.
Solution Approach 2:
The scanning drive circuit is segmented into multiple shift register unit circuits, with odd-number stages on one side and even-number stages on the other side. Each segment operates semi-independently, reducing the complexity of signal routing and control while achieving the narrow frame design goal.
Data Source
AI summary
A shift register unit circuit, a driving method thereof, a scanning drive circuit and a display panel are provided. The shift register unit circuit includes an input sub-circuit configured to set a level at a first node to be an effective level when an input terminal is at an effective level; at least two transmission sub-circuits configured to set a level at a coupled output control node to be an effective level when the first node is at the effective level; and at least two output sub-circuits, each of which is configured to conduct a coupled first clock signal terminal to a coupled output terminal when the coupled output control node is at an effective level.