Electro-optical Device Conduction Member Segmentation
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Solution Overview
Problem
The existing electro-optical devices, such as liquid crystal display devices, face issues with display quality due to variations in the distance between substrates caused by spherical conductors protruding from contact holes, leading to degraded performance.
Innovation Solution
The electro-optical device incorporates a wiring substrate with an insulating layer, a conduction electrode, and a contact portion made of different materials, where the conduction member is disposed at the conduction electrode to electrically couple the wiring line and common electrode, reducing variations in the gap between substrates and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spherical conductor is provided in the contact hole to electrically couple the wiring line and electrode, then electrical conduction is achieved, but the distance between substrates varies largely when the spherical conductor protrudes from the contact hole, degrading display quality
Solution Approach 1:
The conduction member is divided into two distinct parts: a conduction electrode portion embedded in the insulating layer and a contact portion made of different material that penetrates the insulating layer. This segmentation allows each part to fulfill its specific function - the conduction electrode provides stable electrical coupling while the contact portion ensures precise positioning without protrusion, thereby resolving the contradiction between achieving electrical conduction and maintaining substrate distance precision.
Solution Approach 2:
Different materials are used for different parts of the conduction member - the conduction electrode portion uses one material optimized for electrical conduction while the contact portion uses a different material optimized for mechanical stability and precise positioning. This local differentiation of material properties allows the conduction member to simultaneously achieve reliable electrical coupling and precise substrate spacing without the drawbacks of a uniform spherical conductor.
2Reliability
If the spherical conductor protrudes from the contact hole to ensure electrical coupling, then electrical conduction is improved, but the gap between substrates becomes unstable, leading to degraded display quality
Solution Approach 1:
By segmenting the conduction member into an embedded conduction electrode portion and a penetrating contact portion, the invention eliminates the need for protrusion. The contact portion penetrates the insulating layer to establish stable electrical coupling while the embedded conduction electrode maintains a stable gap between substrates, thus resolving the contradiction between electrical coupling reliability and gap stability.
Solution Approach 2:
The contact portion acts as an intermediary element that penetrates the insulating layer to establish electrical coupling between the conduction electrode and the wiring line, while the embedded conduction electrode serves as a mediator that maintains stable spacing. This intermediary structure enables electrical coupling without requiring the conductor to protrude, thereby maintaining gap stability.
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
This configuration reduces variations in the gap between substrates, thereby improving display quality and allowing for more reliable and stable electrical conduction, leading to enhanced performance and reduced size of the electro-optical device.
Implementation Method 1
an electro-optical layer disposed between the pixel electrode and the common electrode, and including an electro-optical material, optical characteristics of which change due to an electric field between the pixel electrode and the common electrode
Implementation Method 2
a conduction member that is electrically conductive, the conduction member being configured to electrically couple the wiring line and the common electrode
Data Source
AI summary
An electro-optical device includes a wiring substrate including a wiring line, a common electrode, a conduction member that is electrically conductive, the conduction member being configured to electrically couple the wiring line and the common electrode, a pixel electrode disposed between the wiring substrate and the common electrode, and an electro-optical layer disposed between the pixel electrode and the common electrode. The wiring substrate includes: an insulating layer disposed between the wiring line and the common electrode, a conduction electrode between the insulating layer and the common electrode and in contact with the insulating layer, the conduction member being disposed at the conduction electrode, and a contact portion composed of a material different from the conduction electrode and penetrating the insulating layer, the contact portion being configured to electrically couple the conduction electrode and the wiring line.