Electrophoresis Substrate Dynamic Light Shielding for Flexible Displays
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Solution Overview
Problem
Commercially available display panels, especially flexible and convertible ones, suffer from light leakage issues due to positional shifts during bending, which conventional wider black matrix solutions address but at the cost of reduced aperture ratio.
Innovation Solution
A substrate design incorporating a black matrix layer and electrophoresis cells with movable charged particles and electrodes, allowing for dynamic light shielding adjustments in response to electrical signals, thereby enhancing light shielding without compromising aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a wider black matrix is used to improve light shielding, then light leakage is reduced, but aperture ratio is reduced
Solution Approach 1:
The patent employs electrophoresis cells with movable charged particles that can dynamically adjust their position in response to electrical signals. When light leakage is detected or anticipated, the charged particles move to block light paths; when not needed, they return to original positions to maintain aperture ratio. This dynamic adjustment allows the system to achieve effective light shielding only when necessary, preserving aperture ratio during normal operation.
Solution Approach 2:
The invention changes the state of the electrophoresis media by applying electrical signals that alter the position of charged particles within the cells. By controlling the electrical parameters (voltage, polarity), the system can switch between different light shielding states without permanently altering the physical structure or reducing the aperture ratio. The charged particles transition between blocked and unblocked positions based on operational requirements.
2Object-affected harmful factors
If fixed light shielding structures are used, then light leakage is reduced, but flexibility and curvature adaptability are reduced
Solution Approach 1:
The electrophoresis cells provide dynamic light shielding that can adapt to different display configurations. When the display panel is bent or converted to a curved mode, the system can detect positional shifts and activate the electrophoresis cells to compensate for light leakage at the new geometry. This dynamic response maintains both flexibility and effective light shielding, unlike fixed structures that would prevent bending or require permanent geometric modifications.
Solution Approach 2:
The system incorporates sensors that detect positional shifts during bending or curvature changes, and automatically triggers the electrophoresis cells to adjust their light shielding accordingly. This self-service mechanism allows the display to maintain proper light control without external intervention or permanent structural modifications, preserving both flexibility and curvature adaptability while preventing light leakage.
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 reduces light leakage in flexible and convertible display panels by dynamically adjusting the light shielding area, maintaining or improving aperture ratio and addressing positional shifts during curvature.
Implementation Method 1
each of the plurality of electrophoresis cells comprises a first electrode, a second electrode, a mixture of an electrophoresis media and charged particles, wherein the charged particles are movable in response to an electrical signal
Data Source
AI summary
The present application discloses a substrate comprising a base substrate; a black matrix layer comprising an array of a plurality of black matrixes on a first side of the base substrate; and a plurality of electrophoresis cells on the first side of the base substrate. Each of the plurality of electrophoresis cells comprises a first electrode, a second electrode, a mixture of an electrophoresis media and charged particle. The charged particles are movable in response to an electrical signal.