Shift Register Unit for Narrow Bezel Display with Row Skipping
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Solution Overview
Problem
The existing scan driving circuits based on Gate Driver On Array (GOA) technology occupy significant frame width, limiting the ability to achieve a narrow bezel design and are restricted to simple progressive scan functions, unable to perform advanced functions like skipping specific pixel rows or refreshing only a portion of the display screen.
Innovation Solution
A simplified scan driving circuit is implemented using a shift register unit with a cascade connection between stages, incorporating additional shift circuits and control circuits to enable skipping of scanning specific pixel rows and refreshing only a portion of the screen, without requiring additional chips or circuit boards, by modifying the existing circuit structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional scan driving circuit is used, then the circuit can perform simple progressive scan function, but it occupies significant frame width and cannot perform advanced functions like skipping pixel rows or partial screen refresh
Solution Approach 1:
The scan driving circuit is divided into multiple independent shift register units, each capable of autonomous operation. Each unit includes separate first and second shift circuits that can be independently controlled, allowing the circuit to be segmented into functional modules that can be selectively activated for different scan modes (progressive scan, skipping specific rows, partial screen refresh), thereby increasing adaptability without proportionally increasing overall frame width.
Solution Approach 2:
The shift register unit is designed with universal functionality to perform multiple scan operations including progressive scan, skipping specific pixel rows, and partial screen refresh. The first and second shift circuits can be configured through control signals to achieve different scanning patterns, making a single circuit design capable of replacing multiple specialized circuits and reducing the total frame width required.
2Adaptability or versatility
If additional chips or circuit boards are added to enable advanced scan functions, then function versatility improves, but device complexity and manufacturing cost increase
Solution Approach 1:
Multiple scan functions (progressive scan, row skipping, partial screen refresh) are merged into a single integrated shift register unit. The first and second shift circuits are combined within the same unit and share common control mechanisms, eliminating the need for separate chips or circuit boards for different scan modes. This integration reduces device complexity while maintaining full functional versatility.
Solution Approach 2:
The circuit employs dynamic control signals to switch between different scan functions. Control terminals can dynamically configure the first and second shift circuits to perform different operations based on real-time requirements, allowing a static physical structure to achieve dynamic multi-functionality without adding complex switching hardware.
Data Source
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AI summary
A shift register unit having a cascade input terminal, a cascade output terminal and a scan output terminal are disclosed. The shift register unit may include a first shift circuit (12), a second shift circuit (13), an input circuit (11), and a control circuit (14). The input circuit (11) may be configured to provide an input signal from the cascade input terminal to an input terminal of the first shift circuit (12) under control of an input clock terminal. The control circuit (14) may be configured to control connection of an output terminal of the first shift circuit (12) and an input terminal of the second shift circuit (13) based on a signal at a first control terminal.