LCD Panel Seal Line Configuration for Moisture Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Moisture condensation on the exposed lateral and upper end portions of the first substrate in liquid crystal display (LCD) panels leads to water droplet formation, which can penetrate the gap between the substrates, causing display quality deterioration.
Innovation Solution
A display panel design where the second substrate covers the panel naming mark of the first substrate, and a water-proof member is formed on the first substrate in the pad region adjacent to the second substrate to prevent water penetration, with a seal line configuration that ensures the liquid crystal layer is sealed outside the display region and closer to the light blocking layer than the display region's edge, and a cell gap maintaining member is used to maintain the gap between the substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the second substrate is made smaller to accommodate the gate pad and data pad connections, then the electrical connection to the PCB is achieved, but the exposed first substrate ends become vulnerable to moisture condensation and water penetration
Solution Approach 1:
The seal line is divided into multiple segments positioned at different locations (left end, right end, and upper end) of the first substrate. This segmentation allows the seal line to comprehensively cover the exposed ends of the first substrate, preventing moisture condensation and water penetration while maintaining the electrical connection configuration with the PCB.
Solution Approach 2:
The seal line acts as an intermediary protective structure between the exposed first substrate ends and the harmful moisture environment. By positioning the seal line to extend beyond the display region and cover the exposed ends, it mediates the protection against water droplet formation and penetration without interfering with the electrical connections.
2Reliability
If the seal line is positioned closer to the display region edge, then the liquid crystal sealing is improved, but the exposed first substrate ends remain vulnerable to moisture
Solution Approach 1:
The seal line configuration extends into the peripheral region dimension, positioning itself closer to the light blocking layer than to the display region edge. This dimensional repositioning ensures that the seal line covers the exposed ends of the first substrate in the peripheral region, providing comprehensive protection against moisture while maintaining effective liquid crystal sealing.
3Object-affected harmful factors
If a water-proof member is added to prevent water penetration, then display quality is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The seal line serves multiple functions simultaneously: it seals the liquid crystal layer, protects against moisture condensation on exposed substrate ends, and prevents water penetration. By making the seal line multi-functional, the patent eliminates the need for separate water-proof members, thereby reducing manufacturing complexity and cost while maintaining display quality.
Data Source
AI summary
A display panel includes: a first substrate including a gate line and a data line crossing the gate line, a pixel portion formed in a display region and electrically connected to the gate and the data line and a gate driving part formed on a first peripheral region and electrically connected to the gate line; a second substrate having a light blocking layer formed on an area of the second substrate corresponding to the first peripheral region; and a seal line formed between the first substrate and the second substrate to confine a liquid crystal layer therebetween, the seal line being formed in an area outside an outer peripheral edge of the display region, the area outside the outer peripheral edge of the display region being closer to an outer peripheral edge of the light blocking layer than to the outer peripheral edge of the display region.