Bidirectional Scanning Drive Circuit for Narrow Bezel Displays
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Solution Overview
Problem
Existing display apparatuses, such as smart watches, can only scan and refresh the screen in a single direction, making it difficult to switch directions without increasing the size of the scanning drive circuits, which is not conducive to designing a narrow bezel.
Innovation Solution
A scanning drive circuit with cascaded shift registers that can operate in both forward and reverse scanning stages, using independent output terminals to control reset and data writing stages of pixel drive circuits, allowing for directional switching without additional circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple scanning drive circuits are provided to realize different screen scanning and refreshing directions, then the scanning direction switching capability is improved, but the circuit space occupation increases
Solution Approach 1:
The scanning drive circuit is designed with multi-functionality to perform both forward scanning and reverse scanning operations using a single circuit. The circuit includes shift registers that can shift signals in different directions and output units that can generate scanning signals for both scanning directions, eliminating the need for separate circuits for each scanning direction.
Solution Approach 2:
The scanning drive circuit incorporates dynamic control mechanisms including clock signals that can be inverted to change scanning direction. The circuit uses controllable shift register operations and output signal generation that can be dynamically switched between forward and reverse scanning modes through control signals from the control unit.
2Area of stationary object
If a single scanning drive circuit is used for both forward and reverse scanning, then the circuit space is reduced, but the circuit complexity increases
Solution Approach 1:
The scanning drive circuit is segmented into functional modules including shift registers, output units, and control units. Each module performs a specific function and can be independently controlled. The shift registers are divided into multiple stages that can operate independently or in sequence, allowing flexible configuration for different scanning directions without requiring complete circuit redesign.
3Measurement precision
If independent output terminals are provided for each shift register, then the scanning control precision is improved, but the circuit complexity increases
Solution Approach 1:
The circuit is segmented into multiple shift registers with independent output terminals, where each shift register can be independently controlled and timed. This segmentation allows precise control of scanning signals for different rows or segments of the display, enabling accurate scanning sequence control without requiring overly complex centralized control.
Data Source
AI summary
A scanning drive circuit, a driving method, a display panel, and a display apparatus are provided. The scanning drive circuit includes 1st to nth shift registers cascaded sequentially. Each shift register includes a pull-down unit, a pull-up unit, and first and second output units. The first output unit is electrically connected to a second supply voltage terminal and a first clock signal output terminal, and configured to output a level to a first output terminal based on levels of a second node and a third node. The second output unit is electrically connected to a third supply voltage terminal and a second clock signal output terminal, and configured to output a level to a second output terminal based on the levels of the second node and a fourth node. The first and the second output terminals of each shift register output effective levels sequentially.