Shift Register Unit for Narrow Bezel OLED Displays
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Solution Overview
Problem
In OLED display apparatuses, the need for multiple driving circuits in non-display areas occupies significant wiring space, making it challenging for narrow bezel designs due to the requirement of separate driving circuits for each signal terminal.
Innovation Solution
A shift register unit comprising multiple sub-circuits that share signal outputs to reduce the number of driving circuits required, with a front-end circuit and output sub-circuits configured to control and output voltages to various signal terminals, allowing for cascaded operation to provide signals to multiple terminals efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate driving circuits are provided for each signal terminal of the pixel circuit, then each signal terminal can be driven independently, but the wiring space in the non-display area increases significantly
Solution Approach 1:
The shift register unit is designed to provide multiple output signals (first output signal, second output signal, third output signal) that can be coupled to different signal terminals (reset signal terminal, gating signal terminal, light-emitting control signal terminal) of pixel circuits. This multi-functional shift register unit replaces what would traditionally require multiple separate driving circuits, thereby reducing the wiring space in the non-display area while maintaining independent driving capability for each signal terminal
Solution Approach 2:
Multiple driving functions are merged into a single shift register unit. The unit integrates the functionality of what would otherwise be separate driving circuits for reset signals, gating signals, and light-emitting control signals into one consolidated circuit block, reducing the overall wiring space required in the non-display area
2Reliability
If multiple driving circuits are used to provide signals to multiple signal terminals, then signal integrity is maintained, but the device complexity increases
Solution Approach 1:
The shift register unit is designed as a multi-functional device that can output multiple different signals (first output signal to reset terminal, second output signal to gating terminal, third output signal to light-emitting control terminal) from a single circuit unit. This maintains signal integrity for each terminal while reducing the overall device complexity by eliminating the need for multiple separate driving circuits
Solution Approach 2:
The shift register unit is divided into multiple output sub-circuits (first output sub-circuit, second output sub-circuit, third output sub-circuit), each responsible for generating a specific output signal. This segmentation within the unified structure allows each signal to be independently controlled and maintained for integrity, while the overall device complexity is reduced compared to having completely separate driving circuits
Data Source
AI summary
Embodiments of the present application provide a shift register unit, a method for driving the same, a gate driving circuit, and a display apparatus. The shift register unit comprises at least two sub-circuits of a first output sub-circuit, a second output sub-circuit, and a third output sub-circuit. The first output sub-circuit is configured to output a voltage at a signal output terminal to a reset signal output terminal; the second output sub-circuit is configured to output the voltage at the signal output terminal to a gating signal output terminal; and the third output sub-circuit is configured to output a voltage at a second voltage terminal to a light-emitting control signal output terminal or is configured to output a voltage at a first voltage terminal to the light-emitting control signal output terminal.