Shift Register Circuit Compensation Pulse for Gate Line Stability
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Solution Overview
Problem
Conventional shift registers face challenges in quickly and stably pulling down gate driving signals to a low-voltage level when not needed, leading to potential mistaken driving of gate lines.
Innovation Solution
The shift register circuit incorporates a compensation circuit that generates a compensation pulse with an enabled period longer than the clock signal, allowing for improved charging and discharging capabilities by maintaining a higher voltage level and preventing premature voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional shift register maintains low-voltage level during no-output period, then mistaken driving is prevented, but the gate driving signal cannot be quickly pulled down to low-voltage level
Solution Approach 1:
The compensation circuit generates a compensation pulse in advance with an enabled period longer than the clock signal, so that the control terminal of the first transistor receives the compensation pulse before the clock signal ends. This preliminary action ensures the transistor is fully charged and ready for quick discharge when needed, resolving the contradiction between reliability and pull-down speed.
Solution Approach 2:
The compensation circuit acts as an intermediary between the clock signal and the first transistor. It introduces a compensation pulse that extends beyond the clock signal duration, ensuring the control terminal maintains sufficient voltage level. This intermediary mechanism enables both reliable low-voltage maintenance and quick pull-down capability.
2Productivity
If the enabled period of compensation pulse is longer than clock signal, then charging and discharging ability is improved, but circuit complexity increases
Solution Approach 1:
The compensation circuit is designed to serve multiple functions: generating the compensation pulse, extending the enabled period, and ensuring proper voltage levels at the control terminal. By making the compensation circuit multi-functional, the patent improves charging and discharging ability while minimizing the increase in overall circuit complexity.
Data Source
AI summary
A shift register circuit includes a first transistor, a capacitor, a pull-up control circuit, a first pull-down circuit, a pull-down control circuit, a second pull-down circuit and a compensation circuit. The compensation circuit further includes a second transistor, a third transistor, a fourth transistor, a fifth transistor and a sixth transistor. The second transistor, the third transistor, the fourth transistor, and the fifth transistor are corporately used to output a compensation pulse; and the sixth transistor is used to output the compensation pulse to a gate terminal of the first transistor thereby compensating a control signal.