Shift Register Circuit Pulse Width Control for Threshold Compensation
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Solution Overview
Problem
Existing shift register circuits for flat panel displays are not suitable for driving pixel units with threshold compensation mechanisms, as they cannot generate scan and emission signals with the required pulse widths to enhance image quality effectively.
Innovation Solution
A shift register circuit comprising multiple stages with scan and emission signal generation modules, where each stage generates scan signals with pulse widths twice that of the clock and emission signals with pulse widths identical to a third clock, synchronized with the system clock, to support pixel units with threshold compensation mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the prior-art shift register circuit generates scan signals with pulse width equal to the first clock pulse width, then the circuit structure is simple, but the pixel units with threshold compensation mechanism cannot operate properly
Solution Approach 1:
The shift register stage is divided into separate modules: a scan signal generation module with first and second pull-down units for generating scan signals, and an emission signal generation module with pull-down units for generating emission signals. This segmentation allows independent optimization of each signal type's pulse width to meet different operational requirements.
Solution Approach 2:
The patent changes the pulse width parameter of scan signals to be substantially twice the pulse width of the first clock, while emission signals maintain pulse width equal to the third clock pulse width. This parameter adjustment enables proper operation of pixel units with threshold compensation mechanism while maintaining circuit functionality.
2Reliability
If the scan signal pulse width is increased to twice the first clock pulse width, then the pixel units with threshold compensation mechanism can operate properly, but the circuit complexity increases
Solution Approach 1:
The circuit is segmented into distinct pull-down units (first pull-down unit for scan signals, pull-down units in emission signal generation module) that can be independently designed and optimized. This modular approach manages complexity by breaking down the signal generation function into manageable, reusable components.
Solution Approach 2:
The pull-down units serve multiple functions: the first pull-down unit generates scan signals with extended pulse width, while pull-down units in the emission signal generation module generate emission signals. This multi-functionality reduces overall circuit complexity by reusing similar structural elements for different signal generation purposes.
Data Source
AI summary
A shift register circuit for providing plural scan signals and plural emission signals includes a plurality of shift register stages. Each shift register stage includes a scan signal generation module and an emission signal generation module. The scan signal generation module is utilized for generating a first scan signal and a second scan signal according to a first clock and a second clock having a phase opposite to the first clock. The first and second scan signals have pulses opposite to each other. The pulse width of the first scan signal is substantially twice that of the first clock. The emission signal generation module is utilized for generating an emission signal according to a third clock and a fourth clock having a phase opposite to the third clock. The pulse width of the emission signal is substantially identical to that of the third clock.