LC Display Spacer with Passivation Film for Durability
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Solution Overview
Problem
Conventional spacers for liquid crystal display devices are prone to deformation under external forces, detachment at interfaces, and reduced durability, leading to defects and decreased liquid crystal margin, especially in larger displays under varying temperature and humidity conditions.
Innovation Solution
A method involving the formation of a spacer body on a substrate and a passivation film on the spacer body to enhance durability and prevent detachment, using materials like silica, polymers, or fiber pieces processed into specific shapes and surface-treated for improved adhesion, with a passivation film thickness between 0.05 to 2 μm to protect the spacer from external forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the spacer size is increased to prevent detachment, then the adhesive strength is improved, but the maximum size is limited by aperture ratio and dielectric constant requirements
Solution Approach 1:
The spacer is constructed as a composite structure with a core spacer body and an outer passivation film layer. This composite design allows the spacer to achieve enhanced mechanical strength and adhesion without increasing the overall spacer dimensions, as the passivation film provides additional bonding area and structural reinforcement while maintaining the original aperture ratio and dielectric constant requirements.
2Strength
If the adhesive strength is improved to prevent detachment, then the spacer durability is enhanced, but the stability of the spacer material deteriorates
Solution Approach 1:
The passivation film is formed with controlled thickness parameters (typically 0.1-2.0 μm) to optimize the balance between adhesion enhancement and material stability. By precisely controlling the film thickness and composition parameters, the spacer achieves improved bonding without compromising the stability of the underlying spacer material, preventing excessive cross-linking or structural degradation.
3Productivity
If the rubbing intensity is increased to reduce rubbing process time, then the productivity is improved, but the spacer may be separated due to friction causing white spots
Solution Approach 1:
The passivation film is formed beforehand to create a protective cushioning layer that shields the spacer body from mechanical damage during the rubbing process. This pre-formed protective layer absorbs the frictional forces generated during alignment film rubbing, preventing direct contact and potential separation between the spacer and substrate, thereby eliminating white spot defects while allowing for efficient rubbing process timing.
4Ease of manufacture
If the spacer is left standing vertically under high temperature and humidity for a predetermined time, then the gravity defects are formed, but the liquid crystal amount must be decreased which deteriorates durability
Solution Approach 1:
The passivation film is formed as a preliminary protective action before the spacer undergoes vertical standing during manufacturing. This pre-formed protective layer prevents moisture absorption and structural deformation that would otherwise occur during the vertical standing period under high temperature and humidity conditions, eliminating the need to decrease liquid crystal amount while maintaining display durability.
Data Source
AI summary
The present invention provides a method of manufacturing a spacer for a liquid crystal display device that includes a step a) of forming a spacer body on a substrate body and a step b) forming a passivation film on the spacer body, a substrate for a liquid crystal display device having the spacer manufactured by the method, and a liquid crystal display device having the substrate for the liquid crystal display device.