LCD Column Spacer Protrusions for Touch Spot Prevention
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Solution Overview
Problem
Existing liquid crystal display (LCD) devices face issues with contact area between column spacers and substrates leading to frictional forces, touch spots, and gravity defects, particularly in large screens, due to the fixed nature of column spacers and their flat surface contact, which affects image uniformity and luminance.
Innovation Solution
The introduction of column spacers with protrusions and recesses on their contact surface, which reduces the contact area with the TFT array substrate, concentrating pressure on specific points and preventing vacuum states, thereby minimizing touch-induced spots and gravity defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If column spacers have a flat contact surface, then the contact area with the substrate is large, but this generates frictional forces and touch spots that affect image uniformity
Solution Approach 1:
The column spacer contact surface is designed with protrusions instead of a flat surface. These protrusions concentrate the contact area to specific points, reducing the overall contact area between the column spacer and substrate. This curvature-based design minimizes frictional forces and prevents vacuum state formation, thereby eliminating touch spots and maintaining image uniformity.
2Stability of the object's composition
If column spacers are fixed to the substrate, then they maintain cell gap effectively, but this creates vacuum states that lead to gravity defects
Solution Approach 1:
The protrusions on the column spacer contact surface prevent complete contact with the substrate, eliminating vacuum state formation. By concentrating contact to specific points rather than a continuous flat surface, the design maintains cell gap stability while preventing the vacuum conditions that cause gravity defects.
3Strength
If column spacers have large contact area with substrate, then bonding is strong, but pressure distribution causes touch-induced spots
Solution Approach 1:
The protrusions concentrate the bonding interface to specific points, creating strong localized bonds while minimizing the overall contact area. This point-contact approach maintains sufficient bonding strength to hold the cell gap while preventing the distributed pressure that causes touch-induced spots and image non-uniformity.
Data Source
AI summary
A liquid crystal display device includes a first substrate having a step difference part; a second substrate facing the first substrate; a column spacer between the first substrate and the second substrate, a contact surface of the column spacer with the step difference part of the first substrate including a plurality of protrusions; and a liquid crystal layer between the first substrate and the second substrate.