Viewing Angle Control Device Groove Electrode Design
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Solution Overview
Problem
Existing viewing angle control devices face issues with alignment film coating liquid overflow, leading to reduced adhesion of sealing members and decreased conductivity of power supply terminals due to the need for alignment film coating and voltage application.
Innovation Solution
A viewing angle control device with a groove on the inner surface of electrodes to prevent liquid overflow and a conductor with lower resistivity than the electrodes, connected at the groove or its periphery, to maintain voltage uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alignment film coating liquid is applied to the inner surface of the first electrode, then the alignment film is formed to control liquid crystal molecule orientation, but the coating liquid overflows and reaches the sealing member or power supply terminal causing reduced adhesion and conductivity
Solution Approach 1:
The first electrode is segmented by forming grooves that divide the electrode surface into distinct regions. The coating liquid is confined to specific regions between the grooves, preventing overflow to the sealing member and power supply terminal while ensuring adequate coverage of the alignment film in the effective display area.
Solution Approach 2:
The grooves act as intermediary structures that physically separate the coating liquid application area from the sealing member and power supply terminal. These grooves serve as barriers that intercept and contain the coating liquid, preventing it from reaching critical components that would be damaged by liquid contamination.
2Reliability
If a groove is formed in the first electrode to prevent liquid overflow, then coating liquid containment is improved, but the electrode resistance increases due to the groove structure
Solution Approach 1:
The compensation conductor is placed locally at the groove position where resistance increase occurs. This conductor has higher conductivity than the electrode material and is positioned specifically to compensate for the resistance increase caused by the groove, thereby restoring voltage uniformity across the electrode without requiring changes to the overall electrode design.
3Length of moving object
If the first electrode is made thinner to reduce device thickness, then the overall display device thickness is reduced, but the electrode resistance increases and voltage uniformity deteriorates
Solution Approach 1:
The electrode structure is transformed into a composite system consisting of the thin first electrode and the compensation conductor. This composite structure combines the advantages of thin electrodes (reduced device thickness) with the benefits of the compensation conductor (improved voltage uniformity and reduced resistance), allowing both objectives to be achieved simultaneously.
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 groove inhibits alignment film coating liquid overflow, ensuring the adhesion and conductivity of sealing and power supply components, while the conductor maintains voltage uniformity, addressing issues of adhesion and conductivity.
Implementation Method 1
when a voltage is applied to the pair of first electrodes 26 and 27, the liquid crystal molecules in the liquid crystal layer 23 are rotated, and the polarization of image light from the main liquid crystal display unit 14, which is linearly polarized light, is disturbed
Implementation Method 2
it is necessary to apply an alignment film coating liquid and cure it to form alignment films 24, 25
Data Source
AI summary
Provide are a viewing angle control device, a method of manufacturing the same, and a display panel. The viewing angle control device includes a first substrate and a second substrate disposed opposite each other; a first electrode and a second electrode disposed respectively on inner surfaces of the first substrate and the second substrate opposite each other; a first alignment film disposed on an inner surface of the first electrode opposite the second electrode; and a liquid crystal layer disposed between the first substrate and the second substrate. A groove is provided in a region of the inner surface of the first electrode, and a conductor that is electrically connected to the first electrode and has lower resistivity than the first electrode is provided at the groove or at a periphery of the groove.