Inorganic LED Display Optics for Outdoor Reflection Suppression
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Solution Overview
Problem
Inorganic electroluminescent displays with inorganic light-emitting diodes face issues with reduced luminance due to low-resistance wiring reflecting external light, leading to deteriorated display quality, especially when used outdoors.
Innovation Solution
A display apparatus is designed with a substrate, inorganic light-emitting elements, transistors, and a circular polarization plate, where a translucent adhesive layer and flattening layer are used to absorb reflected light, preventing its reflection and maintaining image luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low-resistance wiring is used to couple transistors to power-supply lines and signal lines, then electrical conductivity is improved, but visible light reflection increases causing reduced luminance and deteriorated display quality
Solution Approach 1:
A circular polarization plate is introduced as an intermediary component between the external environment and the display surface. This plate selectively absorbs circularly polarized light in a specific rotation direction, preventing it from reflecting off the low-resistance wiring and reaching the viewer, thus maintaining luminance while preserving the electrical functionality of the wiring
Solution Approach 2:
The circular polarization plate utilizes optical property changes based on light polarization state. By targeting specific circularly polarized light components and absorbing them, the plate effectively reduces the reflection of external light without affecting the electrical conductivity of the underlying low-resistance wiring structure
2Illumination intensity
If a circular polarization plate is added to prevent light reflection, then display quality is improved, but device complexity increases
Solution Approach 1:
The circular polarization plate serves multiple functions simultaneously: it acts as an optical filter to absorb reflected light, improves display quality by maintaining luminance, and can be integrated into existing display structures without requiring fundamental redesign of the pixel or wiring architecture, thus limiting the increase in device complexity
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 prevents external light reflection, enhancing display quality by maintaining image luminance and reducing the impact of external light on the display, especially in outdoor conditions.
Implementation Method 1
a circular polarization plate provided on a first side of the substrate
Implementation Method 2
where a translucent adhesive layer and flattening layer are used to absorb reflected light
Data Source
AI summary
According to an aspect, a display apparatus includes: a substrate; a plurality of pixels arrayed on the substrate; a plurality of inorganic light-emitting elements that are provided in the pixels, respectively; a transistor provided to a first surface of the substrate and coupled to one of the inorganic light-emitting elements; wiring provided to the first surface of the substrate and coupled to the transistor; and a circular polarization plate provided on a first side of the substrate.