Input Sensing Electrode Structure to Prevent Rainbow Band Artifacts
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Solution Overview
Problem
Rainbow-colored band shapes appear on lines connected to sensing electrodes in display devices, affecting the visual quality and user experience.
Innovation Solution
The input sensing part includes a first sensing electrode and a second sensing electrode that cross each other, insulated by a multi-layer structure with inclined surfaces and contact holes, ensuring proper connection and reducing visual artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layer structure with contact holes is used to connect sensing electrodes, then electrical connection is achieved, but rainbow-colored band shapes appear on the display
Solution Approach 1:
The patent introduces a third dimension by creating an inclined surface (oblique surface) on the insulating layer within the contact hole region. This inclined surface causes light to reflect at different angles, preventing the formation of rainbow-colored bands by dispersing the reflected light in multiple directions rather than allowing it to reflect uniformly and create interference patterns.
Solution Approach 2:
The inclined surface is applied locally only in the contact hole region where the second line connects to the first line through the insulating layer. This localized modification targets specifically the area causing the rainbow artifact while maintaining the overall multi-layer structure and electrical connection functionality elsewhere in the display device.
2Reliability
If sensing electrodes are connected through insulating layers with contact holes, then electrical conductivity is maintained, but visual quality deteriorates due to rainbow artifacts
Solution Approach 1:
By adding the inclined surface dimension to the otherwise flat contact hole structure, the patent modifies light interaction without affecting electrical properties. The oblique surface causes light to reflect at varying angles, eliminating the rainbow-colored bands that degrade visual quality while preserving the electrical connection through the contact hole.
Solution Approach 2:
The inclined surface modification is applied specifically to the contact hole region where the second line penetrates the insulating layer. This localized change addresses the visual quality issue at the precise location where electrical connection occurs, maintaining conductivity while improving appearance.
Data Source
AI summary
An input sensing part is disclosed that includes a first sensing electrode, a second sensing electrode that crosses the first sensing electrode and is insulated from the first sensing electrode, a first line connected to the first sensing electrode, a second line that is connected to the second sensing electrode and that includes a second-first line and a second-second line disposed on the second-first line, and an insulating layer disposed between the second-first line and the second-second line. The second-second line is connected to the second-first line through a first contact hole defined in the insulating layer. An inner surface of the insulating layer that defines the first contact hole has a first inclined surface, and the first inclined surface comprises a first-first portion. The second-second line defines a first-first opening that corresponds to the first-first portion of the first inclined surface.