Pixel Circuit Bias Compensation for Display Uniformity
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Solution Overview
Problem
In pixel circuits, ion polarization within driving modules leads to a continuous increase in threshold voltage, affecting display uniformity and causing flickers due to slow brightness adjustment when switching from black to white screens, as existing bias compensation signals are constant and fail to meet adjustment requirements in different situations.
Innovation Solution
A bias compensation module is introduced with a control terminal connected to a control signal line, a first terminal connected to a target signal line, and a second terminal connected to the driving module, using a periodic signal to adjust the threshold voltage, allowing for dynamic adjustments with varying voltage values to meet different requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a constant bias compensation signal is used, then the circuit structure is simple, but the threshold voltage cannot be adjusted dynamically to meet different display requirements
Solution Approach 1:
The patent applies the dynamics principle by replacing the constant bias compensation signal with a periodic signal that dynamically adjusts the threshold voltage. The periodic signal varies in amplitude and frequency to meet different display requirements, enabling adaptive compensation for ion polarization effects under different operating conditions.
Solution Approach 2:
The patent implements periodic action by using a periodic signal to drive the bias compensation module. This periodic signal with varying amplitudes and frequencies provides dynamic threshold voltage adjustment, effectively compensating for ion polarization accumulation over time while adapting to different display scenarios.
2Stability of the object's composition
If ion polarization is allowed to accumulate, then the driving module can maintain its state, but the threshold voltage continuously increases causing display uniformity degradation
Solution Approach 1:
The patent applies preliminary anti-action by proactively compensating for ion polarization before it causes significant threshold voltage drift. The periodic bias compensation signal continuously counteracts the accumulating ion polarization effect, preventing excessive threshold voltage increase and maintaining display uniformity.
Solution Approach 2:
The patent implements feedback mechanisms where the bias compensation module continuously monitors and adjusts the threshold voltage based on the operating conditions. This feedback loop ensures that ion polarization effects are continuously compensated, maintaining stable display performance.
3Stability of the object's composition
If the brightness transitions slowly from black to white screen, then the driving module can stabilize, but human eyes perceive flickers due to the long recovery time
Solution Approach 1:
The patent applies preliminary action by pre-compensating for threshold voltage shifts before they fully develop. The periodic bias compensation signal acts in advance to counteract ion polarization effects, enabling faster brightness transitions without perceptible flickers while maintaining driving module stability.
Data Source
AI summary
A pixel circuit, a display panel, and a display device are provided. The pixel circuit includes a driving module and a bias compensation module. A control terminal of the bias compensation module is electrically connected to a first control signal line, a first terminal of the bias compensation module is electrically connected to a target signal line, a second terminal of the bias compensation module is electrically connected to a first terminal of the driving module or a second terminal of the driving module, and the target signal line is electrically connected to a first periodic signal.