Gate Driver Reset Circuit With Compensation Capacitor Stability
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Solution Overview
Problem
Existing display devices face issues with driving stability and reliability due to threshold voltage shifts and deterioration of charging characteristics, particularly when using pulse or alternating current forms for input signals.
Innovation Solution
A gate driving circuit with stages including first, second, and third circuits to generate gate signals, utilizing a compensation capacitor and transistors configured to apply reset signals in a pulse form during blank and active periods, stabilizing node potentials and preventing deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an input signal is changed to a pulse form or alternating current form rather than a direct current form, then driving stability is improved by relieving threshold voltage shift, but charging characteristics deteriorate
Solution Approach 1:
The patent applies periodic action by using alternating current形式的reset signals instead of direct current signals. The reset signal alternates between high and low levels, creating periodic charging and discharging cycles of the compensation capacitor. This periodic action prevents threshold voltage shift by periodically refreshing the capacitor charge while maintaining stable driving characteristics
Solution Approach 2:
The patent changes the parameter of the reset signal from direct current to alternating current form. By modifying the signal waveform parameters (from constant voltage to time-varying voltage), the patent achieves both improved driving stability through threshold voltage relief and maintained charging characteristics through controlled periodic charging
2Reliability
If a compensation capacitor is added to the first circuit, then threshold voltage shift is relieved and driving reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the compensation capacitor into the existing first circuit structure, integrating it with the reset transistor and other circuit elements. The compensation capacitor is connected between specific nodes (first electrode to second electrode of reset transistor, second electrode to second electrode of first transistor) to form a unified circuit that performs both compensation and signal processing functions, thereby improving reliability without proportionally increasing complexity
Data Source
AI summary
A display device in one example can include a display panel and a gate driver having stages. Each of the stages includes a first circuit, a second circuit, and a third circuit to generate gate signals. The first circuit controls the second circuit, the second circuit controls a first node, a second node, and a third node, and the third circuit outputs a carry signal and the gate signals. The first circuit includes a first reset transistor configured to turn on based on a potential of an Mth node to output the reset signal, and a compensation capacitor having a first electrode connected to a gate electrode of the first reset transistor, and a second electrode connected to the second electrode of the first reset transistor.