OLED Upper Substrate Thickness Variation for Optical Resonance
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in achieving uniform luminous efficiency across different color pixels due to variations in optical thickness, making it difficult to optimize luminance and color purity, especially in mass production.
Innovation Solution
The solution involves forming an organic light emitting display device with a substrate having distinct pixel regions for red, green, and blue colors, where the thickness of the upper substrate facing each pixel region is tailored to match the optical wavelengths of the emitted lights, allowing for optimal resonance structure through differential optical path lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the thickness of the upper substrate is made uniform across all pixel regions, then the manufacturing process is simplified, but the luminous efficiency and color purity cannot be optimized for each color
Solution Approach 1:
The upper substrate is designed with different thicknesses for different color pixel regions (red, green, blue). Specifically, the substrate has a first thickness for the red pixel region, a second thickness for the green pixel region, and a third thickness for the blue pixel region. This local variation in thickness allows each color to have its optical path optimized independently, improving luminous efficiency and color purity for each pixel type while maintaining a relatively simple overall structure.
2Manufacturing precision
If different optical thicknesses are set for each color pixel region, then the luminous efficiency and color purity are improved, but the device structure becomes more complex
Solution Approach 1:
The upper substrate is designed with different thicknesses for different color pixel regions (red, green, blue). Specifically, the substrate has a first thickness for the red pixel region, a second thickness for the green pixel region, and a third thickness for the blue pixel region. This local variation in thickness allows each color to have its optical path optimized independently, improving luminous efficiency and color purity for each pixel type while maintaining a relatively simple overall structure.
3Use of energy by moving object
If the thickness of organic thin layers is adjusted to optimize luminous efficiency, then the luminance is improved, but the manufacturing process complexity increases
Solution Approach 1:
The upper substrate is designed with different thicknesses for different color pixel regions (red, green, blue). Specifically, the substrate has a first thickness for the red pixel region, a second thickness for the green pixel region, and a third thickness for the blue pixel region. This local variation in thickness allows each color to have its optical path optimized independently, improving luminous efficiency and color purity for each pixel type while maintaining a relatively simple overall structure.
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 approach enhances the luminous efficiency and color purity by ensuring that the optical path lengths between the emitting layers and the upper substrate are optimized for each color, resulting in improved display performance.
Implementation Method 1
an organic light emitting display device having an optimal (or improved) resonance structure
Implementation Method 2
adjusting the thickness of an electron transport layer when light emitting from an emitting layer interferes with light reflected from a negative electrode
Data Source
AI summary
An organic light emitting display device and a method of fabricating the same are provided. The organic light emitting display device includes a substrate having first, second and third pixel regions, and an upper substrate facing the substrate. The thicknesses of regions of the upper substrate respectively facing the first, second and third pixel regions are different from each other. The thicknesses of the regions of the upper substrate facing the pixel regions are formed different from each other, such that the organic light emitting display device having an optimal or improved optical resonance structure can be provided.