Positive Pressure Coefficient Varistor Circuit for Trace Mura
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Solution Overview
Problem
The Trace Mura phenomenon occurs in display panels when a hard object scratches across the screen, causing a white line of abnormal display that persists for a long time without physical damage, negatively impacting user experience.
Innovation Solution
Incorporating a first and/or second positive pressure coefficient varistor circuit and/or capacitor circuit in the pixel driving structure, which increases resistance and divides voltage when scratched, reducing the electric field and allowing liquid crystal molecules to quickly return to their original positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hard object scratches across the screen surface, then the liquid crystal molecules are displaced causing Trace Mura phenomenon, but the screen itself and surface film layer are not physically damaged
Solution Approach 1:
The patent introduces a cushioning layer between the screen surface and the liquid crystal layer that absorbs and dissipates the impact energy from hard objects before it reaches the liquid crystal molecules. This prior cushioning prevents the liquid crystal molecules from being displaced by external scratches, thereby preventing Trace Mura phenomenon while maintaining screen integrity.
2Reliability
If the liquid crystal molecules are quickly restored to original positions, then the Trace Mura phenomenon is minimized, but additional circuit components are required
Solution Approach 1:
The patent modifies the electrical parameters of the pixel driving structure by introducing variable resistance elements that dynamically adjust the voltage applied to liquid crystal molecules. When impact is detected, the resistance changes to facilitate rapid restoration of liquid crystal molecules to their original positions, minimizing Trace Mura phenomenon without requiring complete structural redesign.
3Object-affected harmful factors
If the resistance of varistor circuit increases when scratched, then voltage is divided and electric field is reduced, but the circuit structure becomes more complex
Solution Approach 1:
The patent introduces a varistor circuit as an intermediary element between the power supply and the liquid crystal layer. This mediator component automatically adjusts its resistance in response to mechanical stress from scratches, thereby controlling the voltage division and electric field strength without requiring complex control systems. The varistor acts as a passive protective intermediary that simplifies the overall control architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively minimizes the Trace Mura phenomenon by quickly restoring liquid crystal molecules to their original positions after screen pressure is removed, improving display quality.
Implementation Method 1
a first positive pressure coefficient varistor circuit, where a first end of the first positive pressure coefficient varistor circuit is electrically connected with a drain electrode of the switching transistor, and a second end of the first positive pressure coefficient varistor circuit is electrically connected with the pixel electrode
Implementation Method 2
reducing the electric field and allowing liquid crystal molecules to quickly return to their original positions
Data Source
AI summary
A pixel driving structure includes a switching transistor, and further includes: a first positive pressure coefficient varistor circuit. A first end of the first positive pressure coefficient varistor circuit is electrically connected with a drain electrode of the switching transistor, and a second end of the first positive pressure coefficient varistor circuit is electrically connected with the pixel electrode. The pixel driving structure can improve a problem of occurrence of Trace Mura phenomenon of the display panel.