Patterned Spacer for Liquid Crystal Display Panels
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Solution Overview
Problem
Conventional liquid crystal display panels using random spacer beads face issues such as distortion of liquid crystal alignment, reduced contrast ratio, and uneven distribution due to the free movement and agglomeration of spacer beads, which affect the reliability and quality of the display.
Innovation Solution
A patterned spacer is formed using a photosensitive resin composition comprising a triazine-based photopolymerization initiator, an alkali-soluble photopolymerizable reactive resin binder, and a polymerizable compound, allowing for precise control of spacer height and position, thereby maintaining a consistent distance between substrates and preventing undesirable marks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If random spacer beads are used to maintain distance between substrates, then the manufacturing process is simple, but the spacer beads move freely and agglomerate causing uneven distribution, liquid crystal alignment distortion, and reduced contrast ratio
Solution Approach 1:
The spacer composition is applied to the lower substrate before assembling the display panel, allowing the spacer to be pre-positioned and patterned in the exact location needed. This preliminary action ensures uniform distribution and prevents agglomeration that occurs with random bead application.
Solution Approach 2:
The patent replaces the mechanical application method of random spacer beads with a photosensitive resin composition that can be precisely patterned using photolithography. This substitution of mechanical application with optical patterning achieves both ease of manufacture and high precision uniform distribution.
2Ease of manufacture
If random spacer beads are used, then the application process is simple, but the spacer beads cause distortion of liquid crystal alignment and reduce contrast ratio
Solution Approach 1:
The patent replaces mechanical spacer beads with a photosensitive resin composition that forms a patterned spacer through photolithography. This substitution eliminates the free movement and agglomeration of beads, ensuring proper liquid crystal alignment and maintaining high contrast ratio while keeping the manufacturing process simple.
Solution Approach 2:
The patterned spacer composition allows different regions to have different properties - the spacer regions provide distance maintenance while the non-display regions can be optimized for liquid crystal alignment. This local quality control ensures high reliability of liquid crystal alignment without sacrificing manufacturing simplicity.
3Manufacturing precision
If a photosensitive resin composition is used to form a patterned spacer, then the position and height of spacers can be precisely controlled, but the manufacturing process becomes more complex
Solution Approach 1:
The patent uses photolithography to pattern the spacer composition, replacing complex mechanical positioning and height control methods. This optical patterning technique achieves precise control of spacer position and height while actually simplifying the overall manufacturing process through standard semiconductor fabrication techniques.
Solution Approach 2:
The patent controls spacer height and position by adjusting parameters of the photosensitive resin composition formulation and photolithography process conditions. This parameter-based control achieves high precision while keeping the process relatively simple compared to mechanical methods.
4Device complexity
If conventional photopolymerization initiators are used, then the formulation is simple, but the sensitivity and developability of the photosensitive resin composition are insufficient
Solution Approach 1:
The patent uses a composite photopolymerization initiator system combining a triazine-based initiator with other initiators, achieving both high sensitivity and good developability. This composite material approach enhances the performance of the photosensitive resin composition while maintaining formulation simplicity through well-established photopolymerization chemistry.
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 solution provides a display panel with improved reliability, increased solidity, and enhanced mechanical and chemical resistance, along with high sensitivity and developability, effectively addressing the limitations of traditional spacer technologies.
Implementation Method 1
a patterned spacer which is formed from a photosensitive resin composition
Data Source
AI summary
Disclosed is a display panel including a lower substrate, upper substrate, and a patterned spacer that causes the lower substrate and upper substrate to be spaced apart from each other by a predetermined distance, wherein the patterned spacer is obtained from a photosensitive resin composition comprising: (a) a triazine-based photopolymerization initiator represented by the following formula 1; (b) an alkali-soluble photo polymerizable reactive resin binder; and (c) a polymerizable compound:(wherein each of R1-R5 has the same meaning as defined herein). A photosensitive resin composition for use in a patterned spacer is also disclosed, the composition comprising: (a) a triazine-based photopolymerization initiator represented by the following formula 1; (b) an alkali-soluble photopolymerizable reactive resin binder; (c) a polymerizable compound; and (d) a solvent. The photosensitive resin composition shows high sensitivity and excellent properties related with development, and provides a patterned spacer having excellent strength, sensitivity, residue characteristics, film uniformity, residual film ratio, etc.