Micro-LED Display Unit Assembly With Index-Matched Invisible Boundaries
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Solution Overview
Problem
Existing display devices with micro-LED technology face challenges in minimizing the bezel area and making the boundary between adjacent display units invisible to enhance user image immersion.
Innovation Solution
A display device design featuring a wiring substrate with link wire lines, display units with micro-LEDs, and a refractive index matching layer that fills the boundary area, allowing for electrical connections and minimizing the bezel area, while using a bonding member to secure the display units and prevent moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bezel structure is disposed to block the non-display area, then the visibility of the boundary area is reduced, but the bezel width increases which lowers image immersion
Solution Approach 1:
The patent extracts and removes the traditional bezel structure entirely, replacing it with a bonding member that serves both structural and optical functions. The bonding member is positioned only at the essential connection points between display units, eliminating the need for a continuous bezel while maintaining boundary visibility control.
Solution Approach 2:
The bonding member serves multiple functions simultaneously: it provides mechanical support to hold display units together, creates electrical connections between units, and acts as an optical element to manage boundary area visibility. This multi-functionality replaces the traditional single-purpose bezel structure.
2Area of stationary object
If multiple display units are arranged to form a large-area display, then the display area increases, but the boundary areas between adjacent units become visible which reduces image immersion
Solution Approach 1:
The bonding member acts as an intermediary element between adjacent display units. It is strategically positioned to mediate the optical interaction at the boundaries, allowing light to pass through in a controlled manner that prevents boundary visibility while maintaining the structural integrity of the large-area display assembly.
3Area of stationary object
If the spacing between display units is reduced to minimize bezel area, then the bezel area decreases, but the coupling strength between wiring substrate and display units may be compromised
Solution Approach 1:
The bonding member is designed as a composite structure that integrates multiple functional materials. It combines materials with appropriate mechanical properties for strong coupling, electrical conductivity for signal transmission, and optical properties for boundary visibility control, allowing reduced spacing without compromising strength.
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 achieves a minimal or zero bezel area, improving image immersion and coupling strength between the wiring substrate and display units, and enhances the display's transparency and reliability.
Implementation Method 1
a refractive index matching layer filling a boundary area between adjacent ones of the plurality of display units
Data Source
AI summary
A display device includes a wiring substrate on which a plurality of link wire lines are disposed; a plurality of display units including a plurality of light-emitting elements and a plurality of signal lines, respectively, wherein the plurality of display units are disposed on the wiring substrate and are spaced apart from each other, a plurality of bonding members disposed between the wiring substrate and the plurality of display units, respectively so as to electrically connect the plurality of link wire lines and the plurality of signal lines to each other, respectively; and a refractive index matching layer filling a boundary area between adjacent ones of the plurality of display units.