Transparent Layer Refractive Index for Display Luminance
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Solution Overview
Problem
Current display devices face challenges in maintaining high luminance and display quality due to undesired absorption and scattering of light in alignment films and electrodes, leading to rapid luminance decrease as light travels away from the light-emitting element.
Innovation Solution
The implementation of a display device configuration with transparent layers having a lower refractive index than the substrates, strategically positioned between the substrates and alignment films, reduces light entry into alignment films and electrodes, thereby minimizing absorption and scattering, and optimizing light distribution across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light travels through alignment films and electrodes to reach pixels, then light can illuminate the display panel, but absorption and scattering occur causing rapid luminance decrease
Solution Approach 1:
A transparent layer with a lower refractive index than the substrate is introduced as an intermediary between the substrate and alignment film. This intermediate layer reduces the refractive index difference at the interface, thereby reducing light scattering and absorption when light enters the alignment film and electrode, allowing light to reach the pixel while maintaining higher luminance and reducing energy loss.
2Loss of energy
If transparent layers with lower refractive index are introduced to reduce light scattering, then light use efficiency improves, but device structure becomes more complex
Solution Approach 1:
The transparent layer is designed with a specific refractive index parameter that is lower than the substrate but optimized to balance light scattering reduction with structural simplicity. By carefully selecting this optical parameter, the patent achieves improved light use efficiency while minimizing the increase in device complexity, as the layer can be integrated into existing manufacturing processes.
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 effectively suppresses degradation of display quality by maintaining higher luminance and improving light use efficiency, ensuring consistent illumination across the display panel.
Implementation Method 1
a first transparent layer located between the first transparent substrate and the first alignment film... the first transparent layer overlaps a part of the pixel electrode and has a lower refractive index than the first transparent substrate
Data Source
AI summary
According to one embodiment, a display device includes, a first transparent substrate having a side surface and a main surface, a first alignment film disposed along the main surface, a first transparent layer located between the first transparent substrate and the first alignment film, a second transparent substrate, a pixel electrode electrically connected to a switching element, a liquid crystal layer, and a light-emitting element opposed to the side surface. The first transparent layer overlaps a part of the pixel electrode and has a lower refractive index than the first transparent substrate.