Organic Light Emitting Display Panel Light-Blocking Bank Structure
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Solution Overview
Problem
Organic light emitting display panels face reduced visibility, brightness, and contrast ratio issues due to external light interference, which affects their performance, especially in outdoor or bright environments.
Innovation Solution
Incorporating a multi-layered structure with conductive and light-blocking layers, and a bank with light-absorbent materials to absorb or block external light, preventing its reflection and enhancing visibility and contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional organic light emitting display panel is used, then the device structure is simple and manufacturing is easy, but visibility and contrast ratio are reduced due to external light reflection
Solution Approach 1:
The display panel is segmented into multiple functional layers: a base structure layer, a light-blocking layer with specific reflectivity (10-40%), and a light-absorbent layer. This segmentation allows each layer to address specific aspects of external light interference, collectively reducing overall reflection without requiring complete opacity at every interface.
Solution Approach 2:
The patent employs composite material structures combining transparent conductive oxides (ITO, IZO) with light-absorbent materials and light-blocking layers. This composite approach creates a multi-functional system that simultaneously maintains electrical conductivity, controls light reflection, and absorbs external light, resolving the contradiction between structural simplicity and effective light management.
2Object-affected harmful factors
If light-blocking layers are added to reduce external light reflection, then visibility and contrast ratio improve, but manufacturing complexity and process difficulty increase
Solution Approach 1:
The light-blocking layer is designed to serve multiple functions simultaneously: it provides optical reflection control (10-40% reflectivity), electrical conductivity through transparent conductive oxide materials, and structural integration with existing display panel layers. This multi-functionality reduces the need for separate specialized layers, simplifying the overall manufacturing process while maintaining effective light management.
Solution Approach 2:
The patent optimizes the reflectivity parameter of the light-blocking layer to a specific range (10-40%) rather than requiring complete blocking. This parameter optimization balances light reflection reduction with manufacturing feasibility, as moderate reflectivity can be achieved through standard coating techniques without requiring complex multi-layer structures or specialized materials.
3Object-affected harmful factors
If the display panel uses more layers to block external light, then contrast ratio and visibility improve, but the device becomes thicker and more complex
Solution Approach 1:
The light-absorbent layer is strategically positioned and configured to address specific local optical issues within the display panel structure. Rather than uniformly thickening the entire panel, the light-absorbent material is applied in targeted regions where external light reflection occurs, maintaining overall panel thinness while providing effective local light management.
Solution Approach 2:
The light-blocking layer acts as an intermediary between the external environment and the display panel's internal structures. By positioning this layer with controlled reflectivity (10-40%), it mediates external light interaction, reducing the need for additional thick light-blocking structures and maintaining panel thinness while effectively managing light reflection.
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
The solution significantly reduces external light reflectivity, improving the visibility, brightness, and contrast ratio of organic light emitting display panels, while also simplifying manufacturing by eliminating the need for polarizing plates and allowing for a more cost-effective and simplified coating process.
Implementation Method 1
the bank comprising a light-absorbent material or coated with a light-absorbent substance... capable of absorbing external light incident through the substrate
Implementation Method 2
at least one of the signal lines, the gate electrode, the source electrode, the drain electrode and the light-blocking layer comprises a multi-layered structure comprising a conductive layer and least one light-blocking layer
Data Source
AI summary
A display device is provided that comprises a pattern positioned on a substrate, the pattern comprising a multi-layered structure comprising a conductive layer and at least one light-blocking layer in whole or in part; and a bank positioned on the pattern, the bank comprising a light-absorbent material.