Micro LED Display Polarizer Layout for Outdoor Luminance
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Solution Overview
Problem
Inorganic electroluminescent (EL) displays with inorganic light-emitting diodes (micro LEDs) face issues with reduced luminance due to external light reflection from low-resistance wiring, leading to deteriorated display quality, especially in outdoor use.
Innovation Solution
A display apparatus is designed with a substrate, arrayed pixels, inorganic light-emitting elements, transistors, and wiring on the substrate's surface, along with a circular polarization plate. A translucent adhesive layer and a flattening layer are used between the substrate and the circular polarization plate to enhance flatness and prevent light reflection.
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 reflectance 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 polarizes reflected light, causing externally reflected light to be absorbed while allowing emitted display light to pass through, thereby resolving the contradiction between maintaining electrical conductivity and preventing luminance reduction
Solution Approach 2:
The circular polarization plate changes the polarization state of light interactively - it converts linearly polarized reflected light into circularly polarized light that is then absorbed, while allowing the display's emitted light to maintain its luminance. This optical property change enables the wiring to maintain high conductivity without compromising display luminance
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 a reflective countermeasure, maintains luminance, and provides environmental resistance. By integrating these multiple functions into a single component, the solution improves display quality without proportionally increasing device complexity
3Reliability
If inorganic light-emitting elements are used instead of organic EL displays, then environmental resistance is improved, but the reflection issue from wiring becomes more prominent
Solution Approach 1:
The circular polarization plate converts the harmful reflected light into a beneficial effect by selectively absorbing externally reflected light while transmitting the display's emitted light. This transforms the reflection problem into an opportunity to enhance display quality and environmental resistance
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 and maintains image luminance, thereby improving display quality and environmental resistance, especially in outdoor conditions.
Implementation Method 1
a circular polarization plate provided on a first side of the substrate
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.