Display Electrode Layout With Auxiliary Line for Uniform Luminance
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Solution Overview
Problem
Existing display devices face challenges in improving light extraction efficiency and luminance uniformity, particularly due to issues with voltage drop and resistance in the electrodes.
Innovation Solution
The display device incorporates a substrate with sub-pixels, an auxiliary line, and an overcoating layer featuring protrusions and openings, along with a bank and electrodes designed to enhance light reflection and electrode contact, using materials like silicon nitride and organic layers to optimize light extraction and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional electrode structure is used, then the device structure is simple, but light extraction efficiency is poor and luminance uniformity is low
Solution Approach 1:
The electrode structure is segmented into multiple functional regions: a reflective electrode portion for light extraction, a transparent electrode portion for electrical connection, and an auxiliary line for voltage compensation. This segmentation allows each portion to perform its specific function optimally, resolving the contradiction between structural simplicity and light extraction efficiency
Solution Approach 2:
Different portions of the electrode are assigned different local properties: the first electrode portion has high reflectivity for light extraction, the second electrode portion has high transparency for electrical connection, and the auxiliary line has low resistance for voltage compensation. This local differentiation enables the electrode to simultaneously achieve good light extraction efficiency and luminance uniformity while maintaining manufacturing simplicity
2Reliability
If electrode resistance is reduced to improve luminance uniformity, then material cost and manufacturing complexity increase
Solution Approach 1:
The electrode is divided into a main electrode portion and an auxiliary line portion, where the auxiliary line specifically addresses voltage drop issues. This segmentation allows the main electrode to focus on light extraction while the auxiliary line handles voltage compensation, improving luminance uniformity without significantly increasing overall complexity
Solution Approach 2:
The auxiliary line serves multiple functions: it provides electrical connection, compensates for voltage drop, and helps maintain luminance uniformity across the display. This multi-functionality allows a single structural element to address multiple issues, reducing the need for additional components and keeping the overall device complexity manageable
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 design improves light extraction efficiency and luminance uniformity by minimizing resistance and voltage drop across the electrodes, enhancing display quality and reducing luminance differences across the screen.
Implementation Method 1
improve light extraction efficiency by using a side mirror type anode
Implementation Method 2
a second electrode on the organic layer and in contact with the auxiliary line exposed through the opening
Data Source
AI summary
A display device is disclosed. The display device includes: a substrate including a plurality of sub-pixels; an auxiliary line disposed between the plurality of sub-pixels on the substrate; an overcoating layer including a base part having an opening that exposes the auxiliary line and a plurality of protrusion parts protruding from the base part; a first electrode corresponding to each of the plurality of sub-pixels and covering the base part and the plurality of protrusion parts; a bank on a part of the first electrode; an organic layer on the first electrode and the bank; and a second electrode on the organic layer and in contact with the auxiliary line exposed through the opening. An end portion of the bank overlaps with the opening.