Organic Light Emitting Display Device with Integrated Color Filters
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Solution Overview
Problem
In organic light emitting display devices, the wide cell gap between the organic light emitting diode and the color filter due to separate substrate bonding leads to image quality degradation, especially in high-resolution displays with dense pixel intervals, where mismatches during the bonding process can cause the black matrix to overlap the organic light emitting diode.
Innovation Solution
The organic light emitting display device features first and second organic light emitting diodes laterally shifted on a substrate with an encapsulation layer covering them, including multiple layers with color filters disposed at different heights, reducing the cell gap and preventing mismatches by integrating the color filters within the encapsulation layer instead of forming them separately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the color filter substrate and lower substrate are bonded separately, then the manufacturing process is simplified, but the cell gap becomes wide and image quality degrades
Solution Approach 1:
The patent merges the color filter substrate and lower substrate into a single integrated substrate structure. The color filter pattern is formed directly on the lower substrate through a planarization layer, eliminating the need for separate substrate bonding. This integration reduces the cell gap and prevents alignment mismatches between the color filter and organic light emitting diode, thereby improving image quality while maintaining manufacturing simplicity.
2Ease of operation
If separate substrate bonding is used, then device assembly is easier, but the black matrix may overlap the organic light emitting diode due to process margins
Solution Approach 1:
The patent applies preliminary action by forming the color filter pattern and planarization layer on the lower substrate before depositing the organic light emitting diode materials. This sequence ensures that the color filter is precisely positioned relative to the pixel electrode, eliminating the risk of black matrix overlap with the organic light emitting diode that occurs in separate bonding processes where alignment margins cause mismatches.
3Adaptability or versatility
If a wide cell gap is maintained, then substrate bonding is more tolerant, but light efficiency decreases and wavelength spectrum width increases
Solution Approach 1:
The patent changes the key parameter of cell gap distance by integrating the color filter directly on the lower substrate. This reduces the cell gap from the wider distance required in separate bonding configurations to a minimal distance, thereby improving light emission efficiency and reducing the electroluminescent wavelength spectrum width while maintaining sufficient process tolerance through the planarization layer design.
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 enhances light efficiency, reduces the electroluminescent wavelength spectrum width, and improves color reproducibility by minimizing the cell gap and eliminating mismatches caused by process margins, thereby preventing image quality degradation.
Implementation Method 1
Organic light emitting display devices emit light using an organic light emitting diode
Data Source
AI summary
An organic light emitting display device includes a substrate; first and second organic light emitting diodes laterally shifted with respect to each other on the substrate; an encapsulation layer covering the first and second organic light emitting diodes, the encapsulation layer including a plurality of layers; and a first color filter and a second color filter each within the plurality of layers, the first color filter and the second color filter being respectively disposed over respective ones of the first and second organic light emitting diodes at respectively different heights from the substrate.