Display Electrode Via Structure for Reflective Color Band Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Emissive display devices face the challenge of generating reflective color bands at the edge of emission areas, particularly when they do not include a polarizing plate, which affects color distribution and visibility.
Innovation Solution
The display device incorporates a specific design with a source electrode and drain electrode on a substrate, featuring an insulating layer with openings that have a via hole angle between 70 degrees to 85 degrees, and includes a partition wall and spacer with black materials to prevent reflective color bands by reducing diffuse reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a polarizing plate is not included in the display device, then the device complexity is reduced and the structure is simplified, but reflective color bands are generated at the edge of emission areas
Solution Approach 1:
The insulating layer is designed with a specific via hole angle (70-85 degrees) only at the critical edge regions where reflective color bands occur, while other regions maintain standard insulation. This localized geometric modification targets the specific problem area without requiring a polarizing plate across the entire device, thus reducing overall device complexity while suppressing reflective color bands at emission edges.
2Object-generated harmful factors
If the via hole angle of the insulating layer is increased to 70-85 degrees, then reflective color bands are suppressed, but the manufacturing precision requirements are increased
Solution Approach 1:
The via hole angle of the insulating layer is changed from a conventional small angle to a specific range of 70-85 degrees. This parameter modification alters the light reflection characteristics at the emission edge, effectively suppressing reflective color bands. The angle parameter serves as a critical control variable that balances optical performance with manufacturing feasibility.
3Illumination intensity
If black materials are used in the partition wall and spacer, then diffuse reflection is reduced and color distribution is improved, but the material selection and manufacturing complexity increase
Solution Approach 1:
Black materials are applied to the partition wall and spacer components to absorb stray light and reduce diffuse reflection. This color modification enhances color distribution uniformity by preventing unwanted light scattering at structural boundaries. The black material acts as an optical absorber that improves overall display quality without requiring additional optical layers.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses the generation of reflective color bands, improving color distribution and reducing the maximum color difference, even without a polarizing plate, while maintaining structural integrity by controlling the angle and material composition of the insulating layers.
Implementation Method 1
prevent reflective color bands by reducing diffuse reflection
Implementation Method 2
partition wall and spacer with black materials to prevent reflective color bands
Data Source
AI summary
A display device may include a source electrode disposed on a substrate; a drain electrode disposed on the substrate; an insulating layer disposed on the source electrode and the drain electrode, the insulating layer including an opening overlapping the drain electrode; and a first electrode disposed on the insulating layer and electrically contacting the drain electrode in the opening of the insulating layer, wherein an angle between a side surface of the opening of the insulating layer and a plane parallel to the substrate is in a range of about 70 degrees to about 85 degrees.