Polymer Dispersed Liquid Crystal Display with Light-Shielding Layer
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Solution Overview
Problem
Display devices using polymer dispersed liquid crystals face reliability issues due to the risk of short circuits and degradation in display quality caused by unwanted light reflection and scattering, which affect the transparency and scattering states of the liquid crystal layer.
Innovation Solution
The display device incorporates a first and second transparent substrate with a liquid crystal layer containing polymer dispersed liquid crystals, a light emitting module, and a specific configuration of electrodes and light-shielding layers to reduce the risk of short circuits and improve display quality by optimizing the alignment of electrodes and light paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If polymer dispersed liquid crystal is used to enable switching between scattering and transparent states, then display functionality is improved, but reliability deteriorates due to short circuit risks
Solution Approach 1:
A light-shielding layer is introduced as an intermediary component between the liquid crystal layer and the electrode structure. This layer prevents direct optical interaction that could cause unwanted scattering while maintaining electrical isolation, thereby reducing short circuit risks without compromising display functionality
Solution Approach 2:
The device is segmented into distinct functional layers including a light-shielding layer, liquid crystal layer, and electrode structures. This segmentation allows independent optimization of each layer's function, enabling reliable switching between scattering and transparent states while minimizing electrical interference
2Adaptability or versatility
If polymer dispersed liquid crystal is used for display switching, then display versatility is improved, but display quality deteriorates due to unwanted light reflection and scattering
Solution Approach 1:
A light-shielding layer is positioned between the liquid crystal layer and external light sources, acting as a mediator that blocks unwanted reflected and scattered light while allowing controlled light transmission for display operation
Solution Approach 2:
The light-shielding layer is strategically positioned in specific regions where unwanted light reflection and scattering occur most prominently, providing localized suppression of harmful optical effects while maintaining overall display quality
3Reliability
If light-shielding layer and electrode configuration are added to reduce short circuit risk, then reliability is improved, but device complexity increases
Solution Approach 1:
The light-shielding layer serves multiple functions simultaneously: it blocks unwanted light, provides electrical isolation, and structurally organizes the liquid crystal layer, thereby improving reliability without proportionally increasing device complexity
Solution Approach 2:
The light-shielding function and electrical isolation function are merged into a single integrated layer structure, reducing the number of separate components needed and simplifying the overall device architecture while maintaining reliability
4Object-generated harmful factors
If multiple layers and light-shielding structures are introduced to improve display quality, then display quality is improved, but manufacturing complexity increases
Solution Approach 1:
The light-shielding layer is designed to perform multiple functions (optical shielding, electrical isolation, structural support) in a single component, reducing the number of manufacturing steps required compared to separate components for each function
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 suppresses the reduction in reliability by minimizing the risk of short circuits and enhancing display quality by reducing unwanted light reflection and scattering, thereby maintaining the transparency and scattering states effectively.
Implementation Method 1
a liquid crystal layer containing polymer dispersed liquid crystal sealed between the first translucent substrate and the second translucent substrate
Data Source
AI summary
According to one embodiment, a display device includes a first substrate including a scanning line extending along a first direction, a signal line extending along a second direction, a switching element, a first connection electrode, a pixel electrode, and a feed line, a second substrate, a liquid crystal layer containing polymer dispersed liquid crystal, and a light emitting module. The feed line includes an edge extending along the second direction. The first connection electrode is a transparent electrode formed of a same material as the feed line, extends along the first direction, and includes an end portion opposed to the edge.