Optically Clear Fluid Gap for Display Refractive Index Matching
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Solution Overview
Problem
Conventional display devices with air gaps between the display cover and panel suffer from refractive index mismatch, leading to reduced optical performance and potential delamination due to mechanical stresses, which degrades contrast and luminance over time.
Innovation Solution
A display device with a perimeter seal and an optically clear fluid filling the gap between the display panel and cover, matching the refractive index of the cover to minimize reflections and prevent delamination, while a temperature control system circulates the fluid for thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an air gap is left between the display cover and display panel, then the manufacturing process is simple, but the optical performance deteriorates due to refractive index mismatch causing increased parasitic reflections
Solution Approach 1:
The patent introduces an optically clear fluid as an intermediary substance filling the gap between the display cover and display panel. This fluid has a refractive index matched to the display cover material, serving as a mediator that eliminates parasitic reflections at the interface while maintaining the gap structure for thermal management and condensation prevention.
Solution Approach 2:
The patent changes the optical parameter (refractive index) of the medium filling the gap from air (n≈1.0) to an optically clear fluid (n≈1.5, matched to display cover). This parameter change eliminates the refractive index mismatch between the display cover and the gap medium, thereby reducing parasitic reflections and improving optical performance.
2Illumination intensity
If liquid bonding techniques are used to eliminate the air gap, then optical performance improves through refractive index matching, but reliability deteriorates over time due to delamination from mechanical stresses
Solution Approach 1:
The optically clear fluid acts as a non-bonding intermediary that provides refractive index matching without creating adhesive bonds. Unlike liquid bonding materials that cure to form rigid bonds susceptible to delamination, the fluid maintains a stable interface that can accommodate mechanical stresses from shock, vibration, and thermal expansion differences.
Solution Approach 2:
The patent employs a hydraulic principle by using a fluid medium to fill and maintain the gap between components. The fluid provides continuous contact and pressure distribution across the interface, preventing void formation and delamination while maintaining optical performance, unlike solid bonding materials that are prone to cracking and separation.
3Device complexity
If the display cover is bonded directly to the display panel, then the structure is compact, but thermal management capability is reduced limiting temperature control
Solution Approach 1:
The gap between the display cover and display panel serves multiple functions: it provides a pathway for thermal management through the optically clear fluid, prevents condensation formation, and maintains optical performance through refractive index matching. This multi-functional gap design eliminates the need for separate thermal management components while addressing multiple technical requirements.
Solution Approach 2:
The optically clear fluid in the gap acts as a thermal management medium, enabling heat transfer between the display panel and display cover. The fluid can be circulated or allowed to naturally convection, providing active or passive cooling/heating capability while maintaining the structural integrity and optical performance of the display device.
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
Enhances optical performance by reducing internal reflections and maintaining interface integrity, and provides thermal control to maintain display quality across varying environments.
Implementation Method 1
the optically clear fluid has an index of refraction that is substantially matched to an index of refraction of the display cover... This mismatch in the refractive index results in increased parasitic reflections at the interface between the display cover and air gap
Implementation Method 2
a temperature control system comprising a temperature control module. The temperature control system is coupled to the display device and is configured to circulate the optically clear fluid of the display device through the temperature control module to control a temperature of the display device
Data Source
AI summary
Display devices, methods for fabricating display devices, and display systems are provided. For example, a display device comprises a display panel, a display cover bonded to a perimeter of the display panel with a perimeter seal, and an optically clear fluid disposed in a gap between the display panel and the display cover. The optically clear fluid has an index of refraction that is substantially matched to an index of refraction of the display cover. The optically clear fluid may comprise oil, alcohol, water, or a liquid gel, for example.