Display Device Moisture-Absorbent Barrier Layer for Phase Stability
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Solution Overview
Problem
Existing display devices, particularly those used in head-mounted displays, face challenges in preventing moisture permeation, which can lead to changes in phase difference and black luminance, as well as the occurrence of haze, compromising the reliability and performance of high-resolution images.
Innovation Solution
Incorporating a barrier layer containing a moisture absorbent material in the display device structure, which is in contact with or surrounds the phase retardation layer and wire grid polarizer, to prevent moisture ingress and maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier layer with moisture absorbent material is added to protect the phase retardation layer, then moisture protection is improved, but device complexity increases
Solution Approach 1:
The barrier layer is integrated within the existing display device structure, nesting the moisture protection function within the existing layered architecture. The barrier layer is positioned between the phase retardation layer and wire grid polarizer, utilizing the existing structural space without requiring external additions, thus providing moisture protection while minimizing structural complexity increase
Solution Approach 2:
The barrier layer is constructed using composite materials that combine moisture absorbent properties with optical compatibility. By selecting materials that possess both moisture absorption capability and appropriate optical characteristics (refractive index, transparency), the barrier layer provides effective moisture protection while maintaining optical performance and avoiding the need for additional complex structural elements
2Reliability
If the barrier layer is positioned to contact the phase retardation layer, then moisture protection is improved, but manufacturing precision requirements increase
Solution Approach 1:
The barrier layer extends not only in the thickness direction but also in the planar direction beyond the phase retardation layer. This dimensional extension creates an overlapping region that tolerates variations in layer alignment during manufacturing, reducing the precision requirements while ensuring continuous moisture protection across the interface between layers
Solution Approach 2:
The barrier layer is designed as a thin film structure that can conform to the phase retardation layer surface. This thin film approach allows for effective moisture protection through direct contact while the extended planar dimensions provide alignment tolerance, balancing moisture protection effectiveness with manufacturing feasibility
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 barrier layer effectively protects the phase retardation layer from moisture, preventing changes in phase difference and black luminance while reducing haze, thereby enhancing the reliability and image quality of high-resolution displays.
Implementation Method 1
the barrier layer contains a moisture absorbent material
Data Source
AI summary
A display device and an optical device are provided. The display device includes a substrate, a display element layer disposed on the substrate, and including a first electrode, a light emitting layer, and a second electrode, a phase retardation layer disposed on the display element layer, a barrier layer disposed on a side surface of the phase retardation layer, and a wire grid polarizer disposed on the phase retardation layer, wherein the barrier layer contains a moisture absorbent material.