OLED Sub-Pixel Transmissive Conductive Layers for Color Purity
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Solution Overview
Problem
Existing organic light emitting display apparatuses face limitations in improving image quality due to variations in optical characteristics such as brightness and color coordinates of visible rays emitted by different organic light emitting layers, which affect color purity and optical efficiency.
Innovation Solution
The apparatus includes a display region with sub-pixels having thin film transistors, pixel electrodes, and organic light emitting layers for red, green, and blue colors, with transmissive conductive layers and an insulating member to optimize optical path lengths and enhance image quality through a microcavity effect, and a pad part with Ti or Ti/Al/Ti structure for improved electrical connectivity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional organic light emitting layers are used without additional conductive layers, then the device structure is simple, but the color purity and optical efficiency are insufficient
Solution Approach 1:
The patent divides the conductive layer into multiple segments: a first transmissive conductive layer and a second transmissive conductive layer stacked sequentially. This segmentation allows each layer to contribute differently to the optical path, improving color purity and optical efficiency while maintaining manageable structural complexity
Solution Approach 2:
The patent introduces a vertical stacking dimension by placing the first and second transmissive conductive layers at different heights between the pixel electrode and organic light emitting layer. This dimensional change creates a microcavity effect that enhances optical performance without expanding the lateral device footprint
2Reliability
If a pad part with exposed side is designed for electrical connectivity, then electrical connectivity is improved, but the device structure becomes more complex
Solution Approach 1:
The pad part structure is designed with an exposed side that extends beyond the encapsulation layer, providing partial exposure rather than full exposure. This partial action approach ensures reliable electrical connectivity where needed while minimizing the overall structural complexity and maintaining device compactness
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 improves color purity and optical efficiency of visible rays emitted by each sub-pixel, resulting in enhanced image quality and manufacturing efficiency by utilizing a microcavity effect and galvanic erosion phenomenon for uniform pattern formation of conductive layers.
Implementation Method 1
an organic light emitting layer is disposed between a cathode electrode and an anode electrode and visible rays are generated in the organic light emitting layer connected to both electrodes when a voltage is applied to both of the electrodes
Implementation Method 2
improves color purity and optical efficiency of visible rays emitted by each sub-pixel, resulting in enhanced image quality and manufacturing efficiency by utilizing a microcavity effect
Implementation Method 3
utilizing a microcavity effect and galvanic erosion phenomenon for uniform pattern formation of conductive layers
Data Source
AI summary
An organic light emitting display apparatus and a method of manufacturing the same wherein in the organic light emitting device, each of the first to third sub pixels includes: a thin film transistor; a pixel electrode electrically connected to the thin film transistor; and an organic light emitting layer electrically connected to the pixel electrode; and an opposite electrode formed on each of the organic light emitting layers. A pad part is disposed on the non-display region, the pad part including at least one side exposed. The first sub pixel includes a first transmissive conductive layer and a second transmissive conductive layer sequentially stacked between the pixel electrode of the first sub pixel and the organic light emitting layer. The second sub pixel includes the first transmissive conductive layer between the pixel electrode of the first sub pixel and the organic light emitting layer.