Organic EL Anode Side Walls for Conductivity and Contrast
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Solution Overview
Problem
Existing organic electro luminescence display devices face issues with low conductivity of anode electrodes and reduced contrast ratio due to the opaque conductive patterns occupying light emitting areas and external light transmission through transparent anode electrodes.
Innovation Solution
The implementation of parallel conductive light shielding patterns on both sides of anode electrodes, made of opaque conductive materials, which improve conductivity and aperture ratio by being located in non-light emitting areas, thereby intercepting external light and enhancing contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an opaque conductive pattern is formed on the anode electrode to improve conductivity, then the conductivity of the anode electrode is improved, but the aperture ratio becomes smaller and the contrast ratio deteriorates
Solution Approach 1:
The patent extends the light shielding function from a two-dimensional planar pattern to a three-dimensional structure by forming side walls along the edges of the anode electrode. This vertical extension allows the shielding function to be achieved without occupying additional horizontal light emitting area, thus maintaining aperture ratio while improving contrast ratio.
Solution Approach 2:
The patent divides the light shielding function into multiple segments: a bottom light shielding layer formed in the non-light emitting area and side walls formed along the edges of the anode electrode. This segmentation allows the shielding function to be distributed across different spatial locations, improving conductivity and contrast ratio without sacrificing aperture ratio.
2Reliability
If an opaque conductive pattern is formed on the anode electrode to improve conductivity, then the conductivity of the anode electrode is improved, but the contrast ratio deteriorates due to light transmission
Solution Approach 1:
The patent introduces a vertical dimension by forming side walls along the edges of the anode electrode. These side walls extend downward from the top surface to block external light from reaching the light emitting layer from lateral directions, thereby improving contrast ratio without affecting the light emitting area or aperture ratio.
Solution Approach 2:
The patent introduces a bottom light shielding layer as an intermediary element formed in the non-light emitting area beneath the anode electrode. This layer acts as a mediator to block external light before it can reach the light emitting layer, improving contrast ratio without interfering with the light emission function or reducing aperture ratio.
3Illumination intensity
If the anode electrode is made transparent to allow light emission, then the light emitting efficiency is improved, but external light transmission reduces the contrast ratio
Solution Approach 1:
The patent applies different optical properties to different locations: the anode electrode maintains transparency in the light emitting area for efficient light emission, while opaque light shielding structures are formed in the non-light emitting area and along the edges to block external light. This local differentiation allows simultaneous optimization of light emitting efficiency and contrast ratio.
Solution Approach 2:
The patent segments the anode electrode structure into functional zones: a transparent central region for light emission and peripheral shielding regions (side walls and bottom layer) for light blocking. This segmentation allows the electrode to simultaneously perform light emission and light shielding functions in different spatial locations.
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 solution significantly improves the conductivity of anode electrodes and contrast ratio by increasing the aperture ratio and effectively intercepting external light, leading to enhanced light emitting efficiency and brightness.
Implementation Method 1
the first and second conductive light shielding patterns include an opaque conductive material and intercept an external light
Implementation Method 2
the first and second conductive light shielding patterns include an opaque conductive material and intercept an external light
Implementation Method 3
The organic EL display device has electrons and holes emitted if a driving signal is applied to the anode electrode 4 and the cathode electrode 12, and the electron and hole emitted from the anode electrode 4 and the cathode electrode 12 are recombined within the light emitting layer 10C to generate a visible ray
Implementation Method 4
the generated visible ray exits to the outside through the anode electrode 4 to display a designated picture or image
Data Source
AI summary
An organic electro luminescence display device having a plurality of anode electrodes which are disposed in parallel to a substrate, formed of a transparent conductive material and electrically separated from each other; a first conductive light shielding pattern formed along a first side of each of the anode electrodes; and a second conductive light shielding pattern formed along a second side of each of the anode electrodes.