LCD Protrusion Structure for Vibration-Resistant Column Spacer
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Solution Overview
Problem
Liquid crystal display (LCD) devices suffer from image defects due to deformation or damage of column spacers caused by external vibrations, leading to changes in the gap between substrates and reduced displaying quality over time.
Innovation Solution
The LCD device incorporates a protrusion structure on the first substrate that overlaps with column spacers, comprising layers made of the same material as the thin film transistor and electrodes, to maintain a constant gap and prevent deformation by moving in the same direction as the spacers during vibrations, thus minimizing damage and ensuring a stable display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If column spacers are used to maintain gap between substrates, then gap maintenance is improved, but deformation or damage occurs due to external vibrations
Solution Approach 1:
The protrusion and column spacer are merged into a single integrated structure. The protrusion extends from the first substrate and combines with the column spacer to form a unified gap-maintaining element, eliminating the relative movement and friction between separate components that caused damage under vibration.
Solution Approach 2:
The protrusion is pre-formed on the first substrate before assembly, positioned to overlap with the column spacer. This preliminary positioning ensures that when the column spacer is attached, it immediately engages with the protrusion to form the integrated structure that resists vibration-induced damage.
2Ease of manufacture
If protrusion and column spacer are not bonded but contacted directly, then manufacturing simplicity is improved, but friction and damage occur during vibration
Solution Approach 1:
The protrusion and column spacer are merged into a single integrated structure. The protrusion extends from the first substrate and combines with the column spacer to form a unified gap-maintaining element, eliminating the relative movement and friction between separate components that caused damage under vibration.
3Device complexity
If column spacer contacts substrate directly without protrusion, then structure simplicity is improved, but deformation occurs under external pressure
Solution Approach 1:
The protrusion is pre-formed on the first substrate before assembly, positioned to overlap with the column spacer. This preliminary positioning ensures that when the column spacer is attached, it immediately engages with the protrusion to form the integrated structure that resists vibration-induced damage.
Data Source
AI summary
A liquid crystal display device includes a first substrate having a plurality of pixels; a thin film transistor each pixel and having a gate electrode, a drain electrode and a source electrode; a pixel electrode at each pixel and connected to the drain electrode; a plurality of column spacers between the first substrate and a second substrate; and a protrusion on the first substrate overlapped with at least one of the column spacers, wherein the protrusion includes a first layer of the same material as an active layer of the thin film transistor and formed on the same layer as the active layer; a second layer of the same material as the source and drain electrodes and formed on the same layer as the electrodes; and a third layer of the same material as the pixel electrode and formed on the same layer as the pixel electrode.