Liquid Crystal Layer Stripe Polymer Alignment for Display Luminance
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Solution Overview
Problem
Existing display devices using polymer dispersed liquid crystals suffer from non-uniform luminance in the transparent state, leading to noticeable minute scattering and reduced visibility of the background, due to uniform alignment of polymer and liquid crystal molecules across the display panel.
Innovation Solution
The display device incorporates a liquid crystal layer with stripe-shaped polymers and molecules, featuring distinct initial alignment states in different regions, where the intersection angles of polymer extension axes and liquid crystal directors vary, allowing for controlled scattering and transmission of light based on voltage application, thereby improving luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform alignment of polymer and liquid crystal molecules is used across the display panel, then manufacturing simplicity is maintained, but luminance uniformity deteriorates due to noticeable minute scattering
Solution Approach 1:
The patent applies local quality by creating different initial alignment states in different regions of the liquid crystal layer. Specifically, the intersection angle between the polymer extension axis and liquid crystal director is set to a first value in a first region and a second value in a second region, allowing each region to have optimized optical properties for its specific location, thereby achieving uniform luminance across the entire display panel while maintaining manufacturing feasibility
Solution Approach 2:
The patent implements parameter changes by varying the intersection angle parameter of liquid crystal molecules relative to the polymer extension axis across different regions. By controlling this angular parameter to have different values in different regions, the patent optimizes light scattering and transmission characteristics to achieve uniform luminance output across the display panel
2Device complexity
If uniform alignment of liquid crystal molecules is used, then device structure is simplified, but minute scattering increases near the light-emitting module reducing background visibility
Solution Approach 1:
The patent addresses minute scattering by implementing local quality variations in the liquid crystal alignment. Different regions of the liquid crystal layer have different intersection angles between the polymer extension axis and liquid crystal director, which optimizes light transmission in each region and reduces unwanted scattering effects, particularly near the light-emitting module, thereby improving background visibility
Solution Approach 2:
The patent converts the potential harm of light scattering into a beneficial effect by strategically controlling the intersection angles in different regions. The varied alignment configuration transforms what would normally be scattering losses into controlled light transmission patterns that enhance display uniformity and reduce harmful scattering artifacts
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
This configuration enhances luminance uniformity across the display panel, reducing minute scattering near the light-emitting module and maintaining transparency elsewhere, thereby improving the visual recognition of the background.
Implementation Method 1
a display device using a polymer dispersed liquid crystal capable of switching a scattering state of scattering incident light and a transparent state of transmitting incident light
Implementation Method 2
a liquid crystal layer including a stripe-shaped polymer and liquid crystal molecules. The liquid crystal layer has a first region and a second region. When no voltage is applied to the liquid crystal layer, a first intersection angle of a first director of a first liquid crystal molecule and a first extension axis of the polymer included in the first region is different from a second intersection angle of a second director of a second liquid crystal molecule and a second extension axis of the polymer included in the second region
Data Source
AI summary
A display device is providing and includes first substrate including first transparent substrate, and pixel electrode disposed in each of pixels on first transparent substrate; second substrate including second transparent substrate having first and second side surfaces, and common electrode disposed over pixels; and liquid crystal layer disposed between first and second substrates and including stripe-shaped polymer and liquid crystal molecules.