Smart Contact Lens Display Panel With Through-Substrate Wiring
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Solution Overview
Problem
Existing head-mounted displays (HMDs) for augmented reality (AR) suffer from image quality issues due to user movement and narrow viewing angles, and smart contact lenses face challenges in effectively implementing AR due to limited light transmittance and design constraints.
Innovation Solution
A smart contact lens design featuring a display panel with a substrate structure that includes a first and second substrate region, a third substrate region with through portions, and a serpentine connection wiring, along with a conductive pattern and encapsulation layers to enhance light transmittance, combined with a smart contact lens configuration that optimizes light transmission across different regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection wiring is used to electrically connect display element and pixel circuit, then electrical connection is achieved, but light transmittance is reduced
Solution Approach 1:
The patent extracts the connection wiring from the first substrate region (display element region) and relocates it to the third substrate region (wiring region) with through portions. This separation allows the display region to maintain high light transmittance while the wiring region handles electrical connections, resolving the contradiction between electrical connectivity and optical transparency.
Solution Approach 2:
The patent utilizes the third dimension (depth/layering) by creating through portions that extend vertically through the substrate. The connection wiring passes through these vertical channels, enabling electrical connection without occupying the same planar space as the display elements, thus maintaining light transmittance in the display region.
2Illumination intensity
If substrate structure with through portions is used, then light transmittance is improved, but manufacturing complexity increases
Solution Approach 1:
The substrate is segmented into three distinct functional regions: first substrate region for display elements, second substrate region for pixel circuits, and third substrate region with through portions for wiring. This segmentation allows each region to be optimized independently, simplifying the overall manufacturing process despite the multi-region structure.
Solution Approach 2:
The through portions are localized specifically in the third substrate region where wiring is needed, rather than throughout the entire substrate. This localized approach maintains structural integrity and simplifies manufacturing by applying complexity only where necessary for electrical connections.
3Reliability
If edge of substrate extends through third substrate region, then connection wiring can extend from first to second substrate region, but aesthetic appearance deteriorates due to visibility of internal components
Solution Approach 1:
The third substrate region with through portions acts as an intermediary zone that enables electrical connection between the first and second substrate regions while remaining invisible from the front. The edge extensions serving as connection wiring are confined to this intermediate region, maintaining aesthetic appearance by hiding internal wiring structures.
Data Source
AI summary
A display panel includes: a substrate including a first substrate region, a second substrate region surrounding at least a portion of the first substrate region, and a third substrate region being arranged between the first substrate region and the second substrate region and including a plurality of through portions spaced apart from each other; a display element arranged in the first substrate region, a connection wiring electrically connected to the display element and extending from the first substrate region to the second substrate region, and a pixel circuit arranged in the second substrate region, electrically connected to the connection wiring. An edge of the substrate that defines at least a portion of one of the plurality of through portions extends from the first substrate region to the second substrate region, and an extension direction of the edge changes at least twice in the third substrate region.