Blue Phase Liquid Crystal Substrate Reducing Light Leakage
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Solution Overview
Problem
In Advanced-Super Dimensional Switching (ADS) technology, dark state light leakage occurs due to local orientation inconsistencies and alignment shifts in the alignment layers, impacting the display quality of devices.
Innovation Solution
A display substrate with a blue phase liquid crystal layer and driving electrodes, where each set of electrodes consists of two hetero-potential electrodes generating an electric field with a non-zero component perpendicular to the polarization direction of incident light, reducing dark state light leakage by changing the polarization direction of incident light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional alignment layers are used in ADS technology, then the display can achieve basic functionality, but dark state light leakage occurs due to local orientation inconsistencies and alignment shifts
Solution Approach 1:
The patent introduces a blue phase liquid crystal layer with specific material parameters (chirality pitch, viscosity) and controls the electric field parameters (frequency, amplitude) to achieve optimal performance. The electric field frequency is set to match the natural oscillation frequency of the liquid crystal molecules, and the amplitude is optimized to achieve complete switching without leakage.
Solution Approach 2:
The patent combines traditional alignment layer materials with blue phase liquid crystal materials to create a composite structure. The alignment layer provides surface anchoring while the blue phase liquid crystal layer provides bulk optical control, creating a synergistic effect that eliminates dark state leakage while maintaining viewing angles.
2Object-affected harmful factors
If driving electrodes are added to control blue phase liquid crystal layer, then dark state light leakage is reduced, but device complexity increases
Solution Approach 1:
The driving electrodes are designed to serve multiple functions: they act as both the common electrode and the driving electrode for the blue phase liquid crystal layer. This multi-functionality eliminates the need for separate driving electrode structures, reducing device complexity while maintaining the ability to control dark state leakage.
Solution Approach 2:
The patent applies electric fields in multiple dimensions by combining in-plane switching (IPS) electric fields with out-of-plane electric fields from the blue phase liquid crystal layer. This multi-dimensional electric field approach allows simultaneous control of liquid crystal orientation and optical properties without requiring additional electrode layers.
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 dark state light leakage and enhances display quality by ensuring the electric field generated by the driving electrodes forms a specific angle with the polarization direction of incident light, thereby improving the transmittance and reducing light leakage.
Implementation Method 1
the electric field generated by the two hetero-potential electrodes at the blue phase liquid crystal layer has a non-zero component in a first direction perpendicular to a polarization direction of incident light
Implementation Method 2
a multi-dimensional electric field is formed with both a parallel electric field produced at edges of pixel electrodes or common electrodes on the same plane and a longitudinal electric field produced between pixel electrodes and common electrodes, so liquid crystal molecules at all orientations can be rotated and aligned
Implementation Method 3
a multi-dimensional electric field is formed with both a parallel electric field produced at edges of pixel electrodes or common electrodes on the same plane and a longitudinal electric field produced between pixel electrodes and common electrodes
Implementation Method 4
liquid crystal molecules at all orientations, which are located directly above the pixel electrodes or common electrodes and between the pixel electrodes or common electrodes in a liquid crystal cell, can be rotated and aligned
Data Source
AI summary
A display substrate (20) includes: a blue phase liquid crystal layer (25) and one or more sets of driving electrodes for driving the blue phase liquid crystal layer (25) in dark state; each set of the driving electrodes include two hetero-potential electrodes (21, 22), and the two hetero-potential electrodes (21, 22) generate an electric field at the blue phase liquid crystal layer (25) with a non-zero component in a first direction that is perpendicular to the polarization direction of incident light. This display substrate can reduce dark state light leakage and enhance display quality of devices. A manufacturing method for the display substrate (20) and a display device are disclosed.