Photosensitive Resin Spacer Height Control via Bead Dispersion
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Solution Overview
Problem
Existing methods for producing substrates with spacers struggle to achieve uniform cell gaps and flexible control over spacer height, which is crucial for manufacturing optical devices like LCDs.
Innovation Solution
A method involving a photosensitive resin composition layer with beads is used, where the layer is exposed and developed to form spacers with uniform height, allowing for controlled spacer size and height adjustment by varying bead size and ratio, and optionally retaining beads in the spacers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photosensitive resin composition layer is used without beads, then the manufacturing process is simple, but the spacer height cannot be uniformly controlled and cell gap cannot be freely adjusted
Solution Approach 1:
The patent applies composite materials by combining photosensitive resin with inert beads to form a photosensitive resin composition layer. The beads serve as spacers that maintain uniform thickness of the layer, enabling precise control of spacer height after development. This composite approach resolves the contradiction by introducing a simple physical structure (beads) that provides precise dimensional control without complicating the chemical composition of the photosensitive resin itself.
Solution Approach 2:
The patent utilizes parameter changes by varying the size, shape, and concentration of beads in the photosensitive resin composition layer to control spacer height and cell gap. By adjusting bead diameter from 1-50 μm and controlling bead concentration (1-10 parts by weight per 100 parts photosensitive resin), the invention achieves flexible and uniform spacer height control, directly addressing the manufacturing precision requirement while maintaining process simplicity.
2Manufacturing precision
If spacer height is increased to achieve desired cell gap, then cell gap control is improved, but spacer uniformity becomes difficult to maintain
Solution Approach 1:
The patent applies self-service by allowing the beads within the photosensitive resin composition layer to automatically self-align and self-organize during the coating and drying processes. The beads naturally distribute themselves to maintain a uniform layer thickness equal to the bead diameter, eliminating the need for complex external control mechanisms. This self-organizing behavior ensures uniform spacer height even when achieving larger cell gaps, resolving the contradiction between cell gap control and spacer uniformity.
3Length of stationary object
If photosensitive resin composition layer thickness is increased to form taller spacers, then cell gap is improved, but uniformity of spacer height across the substrate deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-dispersing beads of the desired size into the photosensitive resin composition before coating. This preliminary preparation ensures that the bead size itself determines the final spacer height, rather than relying on layer thickness control during coating. The beads are pre-positioned to create uniform spacing, allowing tall spacers to be formed uniformly across the entire substrate simply by controlling bead diameter, thus resolving the contradiction between spacer height and uniformity.
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 method enables the uniform formation of spacers with desired heights and flexible control over cell gap, ensuring consistent and adjustable spacer heights in optical devices.
Implementation Method 1
a layer of a photosensitive resin composition comprising a photosensitive resin and beads is used as the photosensitive resin composition layer in the above exposure and development process
Data Source
AI summary
The present application relates to a method for producing a substrate which includes a step of exposing and developing a photosensitive resin composition layer formed on a surface of a substrate base layer to produce spacers. The method for producing a substrate of the present application can uniformly form spacers having a height according to a desired cell gap and can also freely control the height of the spacers.