Drift Control Circuit for Gate Driving Unit Reliability
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Solution Overview
Problem
The reliability of gate driving units in display panels is compromised due to threshold voltage drift in pull-down transistors, which occurs due to forward stress during alternating noise releasing periods, leading to reduced performance and reliability of the gate driving circuit.
Innovation Solution
A drift control circuit is introduced, comprising a first and second drift control sub-circuit that controls the electrodes of pull-down transistors in the gate driving unit to alternate between forward and reverse bias states during noise releasing periods, using control voltage terminals to maintain the transistors in a reverse bias state, thereby alleviating threshold voltage drift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pull-down transistors perform alternating noise releasing operations, then noise suppression is improved, but threshold voltage drift increases due to forward stress accumulation
Solution Approach 1:
The patent implements periodic reverse bias action by alternately switching the first and second pull-down modules. During each period, one module performs noise releasing while the other receives reverse bias compensation, creating a periodic compensation cycle that counteracts threshold voltage drift accumulated during forward stress periods
Solution Approach 2:
The patent changes the bias state parameter of the pull-down transistors from continuous forward stress to alternating forward and reverse bias states. By controlling the bias voltage to switch between forward bias (during noise releasing) and reverse bias (during compensation), the threshold voltage drift is counteracted through parameter modulation
2Reliability
If reverse bias compensation is applied continuously to counteract threshold voltage drift, then transistor reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies reverse bias compensation periodically rather than continuously by alternating between first and second pull-down modules. Each module receives reverse bias compensation during its non-active period, achieving reliable threshold voltage management while minimizing power consumption through periodic rather than continuous compensation action
Solution Approach 2:
The patent discards the use of one pull-down module during its compensation period while recovering its functionality in the next cycle. By alternating which module is active and which is being compensated, the system recovers threshold voltage stability without requiring both modules to consume power simultaneously for compensation
Data Source
AI summary
The present disclosure provides a drift control circuit, a drift control method, a gate driving unit, a gate driving method and a display device. The drift control circuit includes: a first drift control sub-circuit configured to, during noise releasing performed by the first pull-down module, control first electrodes of pull-down transistors included in the second pull-down module to be coupled to a first control voltage terminal, which is configured to input a first voltage to the first pull-down module during noise releasing performed by the first pull-down module; and a second drift control sub-circuit configured to, during noise releasing performed by the second pull-down module, control first electrodes of pull-down transistors included in the first pull-down module to be coupled to a second control voltage terminal, which is configured to input the first voltage to the second pull-down module during noise releasing performed by the second pull-down module.