Insulating Layer Opening Angle to Prevent Display Edge Color Bands
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Solution Overview
Problem
Emissive display devices face the challenge of generating a reflective color band at the edge of the emission area, particularly when a polarizing plate is not included.
Innovation Solution
The display device incorporates a specific structure where a source electrode and a drain electrode are formed on a substrate, with an insulating layer having an opening overlapping the drain electrode. The angle between the side surface of the opening and a plane parallel to the substrate is controlled to be within a range of about 70 degrees to about 85 degrees, preventing the generation of a reflective color band.
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 a reflective color band is generated at the edge of the emission area
Solution Approach 1:
The patent changes the geometric parameter of the opening in the insulating layer, specifically controlling the angle between the side surface of the opening and the substrate plane to be between 70-85 degrees. This parameter modification reduces diffuse reflection of light at the emission area edge, thereby preventing reflective color bands while maintaining the simplified structure without a polarizing plate
Solution Approach 2:
The patent introduces asymmetric geometry in the opening structure of the insulating layer, where the side surface angle is specifically designed to be between 70-85 degrees relative to the substrate plane. This asymmetric configuration optimizes light reflection characteristics and prevents reflective color bands at the emission area edge
2Object-generated harmful factors
If the angle of the opening side surface is increased to reduce diffuse reflection, then the reflective color band is prevented, but the manufacturing precision requirement increases
Solution Approach 1:
The patent defines a specific parameter range (70-85 degrees) for the opening side surface angle, which balances the need to reduce diffuse reflection with the practical capabilities of manufacturing processes. This optimized range achieves effective prevention of reflective color bands while remaining feasible for standard manufacturing techniques
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 prevents the generation of a reflective color band at the edge of the emission area, even without a polarizing plate, by reducing diffuse reflection and ensuring the structural integrity of the electrodes.
Implementation Method 1
prevents the generation of a reflective color band... by reducing diffuse reflection
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.