Display Device Peripheral Dummy Electrodes Cell Gap
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Solution Overview
Problem
Variation in cell gap due to unevenness between regions with and without wiring lines in display devices can deteriorate display performance, particularly in the peripheral regions of substrates with terminals and driver ICs.
Innovation Solution
Incorporating a display device design with a first and second substrate, a display region, a peripheral region, scanning and signal lines, terminals, connection lines, spacers, and dummy electrodes to maintain consistent cell gap by positioning spacers perpendicular to the substrates and dummy electrodes between the spacers and connection lines, ensuring uniform thickness and reducing positional deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wiring lines are provided in the peripheral region, then electrical connection and signal transmission are improved, but cell gap uniformity deteriorates due to unevenness between wired and non-wired areas
Solution Approach 1:
The patent applies local quality by introducing dummy electrodes specifically in the peripheral region where wiring lines are present, while maintaining the original structure in the display region. This localized modification compensates for the thickness variation caused by wiring lines without affecting the overall display performance, thereby resolving the contradiction between electrical connection requirements and cell gap uniformity.
Solution Approach 2:
The dummy electrodes act as an intermediary element between the wiring lines and the spacers. These dummy electrodes fill the gap created by the presence of wiring lines, serving as a mediator that balances the thickness profile across the substrate and ensures uniform cell gap formation in the peripheral region.
2Area of stationary object
If spacers are provided to define cell gap, then display region coverage is improved, but peripheral region cell gap variation increases due to wiring line unevenness
Solution Approach 1:
The patent extends the spacer structure into the peripheral region and combines it with dummy electrodes to create a localized compensation mechanism. This allows the spacers to maintain their primary function of defining cell gap in the display region while the added dummy electrodes in the peripheral region compensate for wiring line-induced thickness variations, achieving both broad coverage and local precision.
Solution Approach 2:
The dummy electrodes are positioned in advance in the peripheral region before final assembly, pre-compensating for the thickness variations that will occur due to wiring lines. This preliminary placement ensures that when the spacers are positioned, the cell gap remains uniform across the entire substrate including the peripheral region.
Data Source
AI summary
Display device is provided and includes first and second substrates; display region in which pixels are provided on first substrate; peripheral region positioned between edge of first substrate and display region; scanning lines extending in first direction; signal lines extending in second direction; terminals arranged in first direction in peripheral region of first substrate; connection lines in first region and that connect terminals and signal lines; dummy electrodes disposed in second region separated from connection lines in planar view, and signal output lines that couple terminals and connection lines, wherein dummy electrodes are provided in second region surrounded by end of first substrate and signal output lines.