Side Mirror Anode and Trench Electrodes for Display Light Extraction
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Solution Overview
Problem
Current display devices face challenges in enhancing light efficiency and minimizing leakage current, particularly in light emitting display devices where power consumption and viewing angle performance are critical.
Innovation Solution
The implementation of a side mirror type anode with a second overcoating layer having protrusion portions and trenches, along with trench electrodes disposed between sub-pixels, enhances light extraction efficiency and minimizes leakage current by directing light emission and electric fields effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional flat anode structure is used, then the device structure is simple, but light extraction efficiency is low
Solution Approach 1:
The patent introduces protrusion portions that extend vertically from the substrate surface, transforming the flat two-dimensional anode structure into a three-dimensional structure. This dimensional change creates multiple light extraction paths and increases the effective surface area for light emission, thereby improving light extraction efficiency without simply making the device larger
Solution Approach 2:
The anode is segmented into multiple protrusion portions rather than being a single continuous flat surface. Each protrusion portion acts as an independent light extraction element, and the segmented structure allows for better light distribution and reduced internal reflection, improving overall light extraction efficiency
2Reliability
If sub-pixels are disposed adjacent to each other without isolation structures, then device complexity is low, but leakage current occurs between adjacent sub-pixels
Solution Approach 1:
The patent extracts the isolation function from the overall device structure by introducing dedicated isolation structures (such as insulating layers or trenches) between adjacent sub-pixels. This separation removes the harmful electrical interaction between sub-pixels that causes leakage current, while the isolation structures are integrated into the existing manufacturing process to minimize added complexity
Solution Approach 2:
Isolation structures are introduced as intermediary elements between adjacent sub-pixels. These intermediary structures (such as insulating materials) act as mediators that prevent direct electrical contact between sub-pixels, blocking leakage current paths while allowing the sub-pixels to maintain their functional independence
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 improves light extraction efficiency and reduces power consumption while effectively minimizing leakage current, leading to enhanced performance in light emitting display devices.
Implementation Method 1
side mirror type anode... enhance light extraction efficiency
Implementation Method 2
trench electrodes disposed on a side surface of the trench... a current is formed in the opposite direction to a leakage current
Data Source
AI summary
According to an aspect of the present disclosure, a display device may include a substrate including a plurality of sub-pixels; an overcoating layer disposed on the substrate and having a protrusion portion where a trench is disposed and a base portion; an anode disposed to correspond to each of the plurality of sub-pixels and to cover the base portion and a part of the protrusion portion; a bank disposed on a part of the anode; an organic layer disposed on the anode and the bank; a cathode disposed on the organic layer; and a first trench electrode and a second trench electrode disposed on a side surface of the trench.