Bank And Dam Structure for Thin Displays With Reflection Control
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Solution Overview
Problem
Current display devices face challenges in efficiently managing light emission and external light reflection, particularly in the non-display areas, which can lead to reduced color accuracy and increased thickness due to the need for separate substrates and complex masking processes.
Innovation Solution
The display device incorporates a bank structure with alternating metal layers, including aluminum and titanium, and a dam structure with sub-dam structures in the non-display area, allowing for efficient light emission and reduced external light reflection by using the bank structure to form emission areas and connect light emitting elements, and the dams to manage organic material overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If separate substrates are used for display and non-display areas, then light emission control is improved, but device thickness increases
Solution Approach 1:
The patent merges the display area and non-display area onto a single substrate, eliminating the need for separate substrates. The bank structure and dam structures are integrated to simultaneously define emission areas and control organic material in both regions, reducing overall device thickness while maintaining light emission control through the unified structure.
Solution Approach 2:
The patent segments the single substrate into distinct functional regions using bank structures and dam structures. The bank structure defines emission areas in the display region, while dam structures control organic material overflow in both display and non-display areas, enabling differentiated light emission control without requiring separate substrates.
2Measurement precision
If complex masking processes are used for light emission management, then color accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The bank structure and dam structures are designed to self-defined emission areas and self-control organic material distribution through their geometric configurations. The alternating metal layers in the bank structure automatically create the necessary patterns for color accuracy without requiring additional masking processes, simplifying manufacturing while maintaining precision.
Solution Approach 2:
The patent applies different material properties and structural characteristics to different regions: the bank structure with alternating metal layers (aluminum and titanium) provides specific optical properties for emission control in display areas, while dam structures provide containment in non-display areas. This localized structural quality achieves color accuracy without complex masking.
3Length of stationary object
If non-display area is minimized, then device thickness is reduced, but organic material overflow control becomes difficult
Solution Approach 1:
The dam structures act as intermediary elements between the emission areas and the non-display area boundaries. These dam structures with varying heights and positions prevent organic material overflow into the non-display area while allowing the non-display area to be minimized, thus controlling harmful overflow without increasing device thickness.
4Use of energy by moving object
If alternating metal layers are used in bank structure, then light emission efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses alternating metal layers (aluminum and titanium) with different optical and physical properties to enhance light emission efficiency. The specific thicknesses and material compositions are optimized parameters that balance emission performance with manufacturability, allowing efficient light emission while maintaining feasible manufacturing precision requirements through careful parameter selection.
Data Source
AI summary
A display device includes a substrate including a display area surrounded by a non-display area, a bank structure disposed on the substrate in the display area and including a plurality of openings, a plurality of light emitting elements disposed in the openings, a first dam disposed on the substrate in the non-display area and spaced apart from the bank structure, and a second dam spaced apart from the first dam in the non-display area, wherein the bank structure includes a first bank layer and a second bank layer disposed on the first bank layer, wherein the first dam includes a first sub-dam structure and a second sub-dam structure disposed on the first sub-dam structure, and the second bank layer includes tips protruding from sidewalls of the first bank layer, and the second sub-dam structure includes tips protruding from sidewalls of the first sub-dam structure.