LCD Black Matrix and ESD Spacer Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display (LCD) devices face issues with light leakage at the boundary region between non-display and display areas, leading to image quality degradation, and the formation of an electrostatic discharge (ESD) circuit on the substrate causes instability and electrical shorts due to material transfer into contact holes.
Innovation Solution
The solution involves forming the array unit and color filter layer on one substrate, with a black matrix on both substrates to prevent light leakage, and a pattern spacer at the ESD circuit to protect it from electrostatic discharge, thereby preventing electrical shorts and improving manufacturing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a black matrix is formed on the substrate to prevent light leakage, then image quality is improved, but material is transferred into contact holes causing instability and electrical shorts
Solution Approach 1:
The substrate surface is divided into display region and non-display region, with the black matrix formed only in the non-display region. This segmentation prevents material transfer into contact holes located in the display region while maintaining light leakage prevention where needed.
Solution Approach 2:
The black matrix is applied locally only to the non-display region rather than uniformly across the entire substrate. This localized application prevents harmful material transfer to contact holes in the display region while maintaining light blocking functionality where required.
2Device complexity
If the array unit and color filter layer are formed on one substrate, then manufacturing complexity is reduced, but light leakage occurs at the boundary region between non-display and display areas
Solution Approach 1:
The substrate is divided into display and non-display regions with a clearly defined boundary. The black matrix is formed specifically in the non-display region to seal the boundary area, preventing light leakage while maintaining the simplified single-substrate manufacturing approach.
Solution Approach 2:
The black matrix acts as an intermediary element formed in the non-display region, mediating between the display and non-display areas to prevent light leakage at the boundary while allowing the array unit and color filter to remain integrated on the same substrate.
3Object-affected harmful factors
If an ESD circuit is formed on the substrate, then electrostatic discharge protection is provided, but material transfer into contact holes causes instability
Solution Approach 1:
The substrate is segmented into display and non-display regions, with the ESD circuit positioned in the non-display region. This spatial separation prevents material transfer from the black matrix formation process from affecting the ESD circuit contacts, maintaining both electrostatic protection functionality and manufacturing stability.
Solution Approach 2:
The ESD circuit is locally positioned in the non-display region where black matrix material transfer does not occur. This localized placement allows the ESD circuit to maintain manufacturing stability while still providing electrostatic discharge protection for the display region.
Data Source
AI summary
Provided is an LCD having a liquid crystal panel including an active region serving as a display region and an outer region serving as a non-display region. The LCD includes a first substrate including an array unit and a color filter formed in the active region, an ESD (electrostatic discharge) circuit formed in the outer region, a pattern spacer formed on the ESD, a second substrate facing the first substrate, and a sealant for attaching the first and second substrates together.