Electro-optical Device Grounding via Conductor Layer
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Solution Overview
Problem
Electro-optical devices, particularly liquid crystal devices, face issues with charging of the opposite substrate and insulating members due to the lack of reliable grounding, leading to orientation disturbances and high-frequency noise.
Innovation Solution
An electro-optical device configuration that includes a conductive film on the opposite substrate held at a constant potential via a conductor layer, which is electrically connected to a frame portion and a conductive tape, preventing charging by maintaining the conductive film and insulating members at a constant potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the front surface-side conductive film is simply brought into contact with the outer frame, then the grounding process is simplified, but the conductive film cannot be reliably held at ground potential
Solution Approach 1:
The patent introduces a conductor layer as an intermediary between the frame portion and the first conductive film. This conductor layer, made of conductive paste with matrix material and conductive particles, reliably transmits the ground potential to the conductive film while maintaining electrical connection, thus solving the contradiction between manufacturing simplicity and grounding reliability.
2Ease of operation
If a common potential of predetermined frequency is applied to the common electrode, then the liquid crystal device operates normally, but charging of the light guide plate and optical sheets occurs causing high-frequency noise
Solution Approach 1:
The patent applies equipotentiality by holding the first conductive film at a constant ground potential through the conductor layer. This prevents potential differences from developing across insulating members like the light guide plate and optical sheets, eliminating the charging effect and the resulting high-frequency noise while maintaining normal device operation.
3Device complexity
If no wiring or electrode is formed on the opposite substrate, then the device structure is simplified, but the opposite substrate is easily charged disturbing liquid crystal orientation
Solution Approach 1:
The patent segments the grounding function by adding a dedicated first conductive film on the opposite substrate that is electrically connected to the frame portion through the conductor layer. This separate conductive element provides the necessary grounding to prevent liquid crystal orientation disturbance while maintaining the overall simplicity of the substrate structure without requiring complex wiring or electrodes on the opposite substrate.
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
Effectively prevents charging of the opposite substrate and insulating members, reducing image quality degradation and high-frequency noise, while simplifying the grounding process without requiring special cables.
Implementation Method 1
a conductor layer which is placed between the frame portion and the first and second substrates, and is electrically connected to the first conductive film. The first conductive film is held at a constant potential via the conductor layer
Implementation Method 2
the conductor layer may use a conductive paste including a matrix material and a plurality of conductive particles contained in the matrix material
Data Source
AI summary
An electro-optical devices includes: a first substrate; a second substrate having one surface opposite to the first substrate; a support member configured to hold the first and second substrates with the second substrate located outside the first substrate, and to include a frame portion surrounding the first and second substrates; a first conductive film formed on the other surface of the second substrate; and a conductor layer placed between the frame portion and the first and second substrates, and electrically connected to the first conductive film. The first conductive film is held at a constant potential via the conductor layer.