Display Device Spacer Segmentation for Cell Gap Uniformity
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Solution Overview
Problem
In display devices, particularly those with high definition, the insufficient line width of metal wiring lines can lead to inadequate contact with spacers, resulting in non-uniform cell gaps, which affects the uniformity of the display.
Innovation Solution
The display device incorporates a spacer system with a main spacer and sub-spacers on the counter substrate, positioned between pixel electrode rows, and a higher portion of the insulating film to ensure stable contact with the array substrate, maintaining uniform cell gaps even with narrow wiring lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the line width of the metal wiring line is reduced to achieve high definition, then the display resolution is improved, but the contact area between the wiring line and spacer becomes insufficient, resulting in non-uniform cell gap
Solution Approach 1:
The spacer system is segmented into a main spacer and multiple sub-spacers. The main spacer provides primary support while the sub-spacers are distributed around it to ensure comprehensive contact with the array substrate. This segmentation allows the spacer system to maintain uniform cell gap even when the metal wiring line width is reduced for high definition display, as the multiple sub-spacers compensate for the reduced contact area of the narrow wiring line.
Solution Approach 2:
The insulating film is introduced as an intermediary element between the spacer and the array substrate. The insulating film forms a higher portion that protrudes toward the array substrate and makes contact with it, mediating the contact between the spacer system and the substrate. This intermediary structure ensures stable electrical insulation and mechanical contact, preventing direct contact between the narrow metal wiring line and the spacer while maintaining uniform cell gap.
2Volume of moving object
If the line width of the metal wiring line is reduced, then the display becomes more compact, but the reliability of contact between the wiring line and spacer deteriorates
Solution Approach 1:
The spacer is divided into a main spacer and multiple sub-spacers arranged around it. This segmentation distributes the contact points across multiple sub-spacers that can reliably contact the array substrate even when the metal wiring line is narrow, thereby maintaining contact reliability in compact high-definition displays.
Solution Approach 2:
The insulating film acts as a reliable intermediary that ensures consistent contact between the spacer system and the array substrate. The higher portion of the insulating film protrudes and contacts the substrate, providing dependable electrical insulation and mechanical support regardless of the reduced wiring line width, thus maintaining contact reliability.
Data Source
AI summary
A display device includes an array substrate, a counter substrate, a first pixel electrode, a second pixel electrode spaced apart from the first pixel electrode in a first direction, a third pixel electrode spaced apart from the second pixel electrode in the first direction, a first wiring line positioned between the first pixel electrode and the second pixel electrode and extending in a second direction intersecting the first direction, a second pixel electrode row including the second pixel electrode and composed of a plurality of pixel electrodes aligned in the second direction, a third pixel electrode row including the third pixel electrode and composed of a plurality of pixel electrodes aligned in the second direction, a first insulating film disposed on a lower-layer side of the first wiring line, and a spacer protruding from the counter substrate toward the array substrate.