PDLC Display Light-Shielding Layer for Conductive Line Reflection
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Solution Overview
Problem
Display devices using polymer dispersed liquid crystals face degradation in display quality due to undesired reflection and scattering of light on conductive line surfaces, which affects image clarity and efficiency.
Innovation Solution
Incorporating a light-shielding layer that covers at least the first side surface of the conductive line, with specific configurations to minimize reflection and scattering, and strategically placing additional light-shielding layers to optimize light propagation and reduce pixel area coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive line is used in the display device, then electrical conductivity is improved, but light reflection and scattering occur on the conductive line surfaces
Solution Approach 1:
A light-shielding layer is introduced as an intermediary between the conductive line and the light propagation path. This layer absorbs or blocks the light that would otherwise reflect or scatter off the conductive line surfaces, thereby eliminating the harmful optical effects while preserving the electrical conductivity function of the conductive line.
Solution Approach 2:
The harmful light reflection and scattering effects are extracted and isolated by the light-shielding layer, which captures these optical disturbances before they can affect the display quality. The conductive line maintains its electrical function while the optical interference is separated and blocked by the shielding layer.
2Object-affected harmful factors
If the light-shielding layer covers the conductive line, then light reflection and scattering are suppressed, but the pixel area coverage is reduced
Solution Approach 1:
The light-shielding layer is applied locally only to the portions of the conductive line that are most prone to causing reflection and scattering issues, rather than covering the entire conductive line uniformly. This selective application minimizes the reduction of pixel area coverage while still effectively suppressing the harmful optical effects at critical locations.
Solution Approach 2:
Instead of completely covering the conductive line with the light-shielding layer, a partial coverage is applied only where necessary to suppress reflection and scattering. This partial action approach maintains adequate pixel area coverage while still achieving the primary goal of eliminating optical interference.
3Object-affected harmful factors
If additional light-shielding layers are added, then display quality is improved, but device complexity increases
Solution Approach 1:
The light-shielding function is merged with the existing conductive line structure by forming the light-shielding layer directly on the conductive line. This integration combines the electrical conductivity function and the optical shielding function into a unified structure, avoiding the need for separate independent components and thereby reducing overall device complexity.
Solution Approach 2:
The light-shielding layer serves multiple functions: it blocks light reflection and scattering from the conductive line, and simultaneously acts as part of the display structure. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while improving display quality.
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 suppresses degradation in display quality by minimizing light reflection and scattering, improving image clarity and light use efficiency while increasing the area contributing to display per pixel.
Implementation Method 1
a light-shielding layer that covers at least the first side surface of the conductive line
Implementation Method 2
illumination devices using polymer dispersed liquid crystal (hereinafter called 'PDLC') capable of switching a diffusing state of diffusing incident light and a transmitting state of transmitting incident light
Data Source
AI summary
According to one embodiment, a display device includes a first substrate including a light-shielding layer and a conductive line having a first side surface and a second side surface on a side opposite to the first side surface, a second substrate opposed to the first substrate, a polymer dispersed liquid crystal layer held between the first substrate and the second substrate, and including a polymer and liquid crystal molecules, and a light-emitting element opposed to an end portion of at least one of the first substrate and the second substrate, wherein the first side surface is closer to the light-emitting element than the second side surface, and the light-shielding layer covers at least the first side surface of the conductive line.