OLED Pixel Structure for High Color Purity via Optical Interference
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Solution Overview
Problem
Organic light emitting devices face limitations in color reproducibility due to the inherent limitations of color filters, resulting in reduced color purity of light passing through them.
Innovation Solution
The organic light emitting device incorporates a structure with multiple translucent members and transparent members, including oxide conductive and metal layers, to enhance light reflection and interference, allowing for improved color purity by controlling the thickness and refractive index of these layers, and optionally using inorganic layers or multilayers for further reflection and constructive interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If color filters are used to obtain desired colors from white light, then color display capability is improved, but color purity is reduced due to limitation in color reproducibility of the color filters
Solution Approach 1:
The invention divides the color filtering function into multiple separate color filters (red, green, blue) instead of using a single white light source with one color filter. Each pixel type (red, green, blue) has its dedicated color filter, allowing each filter to optimize for its specific wavelength range, thereby maintaining high color purity while achieving full color display capability.
Solution Approach 2:
Different color filters with specific optical characteristics are applied to different pixel regions. Each color filter is designed with specific spectral transmission properties tailored to its intended color output, allowing local optimization of color purity for each pixel type while maintaining overall display versatility.
2Manufacturing precision
If multiple translucent members and transparent members are added to enhance light reflection and interference, then color purity is improved, but device complexity increases
Solution Approach 1:
The invention combines multiple functions into the translucent members: they serve as both structural components of the display device and as optical elements that provide reflection and interference effects. By integrating these optical functions into existing structural layers rather than adding separate components, the patent achieves enhanced color purity without proportionally increasing device complexity.
Solution Approach 2:
The translucent members are designed to perform multiple functions simultaneously: they provide mechanical support, enable light transmission, and create optical interference effects for color enhancement. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity while achieving improved color purity.
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 color reproducibility and luminance by optimizing light path lengths and reflections, achieving high color purity for primary colors through constructive interference, thereby improving the overall display quality.
Implementation Method 1
enhance light reflection and interference
Implementation Method 2
enhance light reflection and interference, allowing for improved color purity by controlling the thickness and refractive index of these layers
Implementation Method 3
achieving high color purity for primary colors through constructive interference
Data Source
AI summary
The present invention relates to an organic light emitting device and a manufacturing method thereof. The organic light emitting device according to an embodiment of the present invention comprises: a first pixel displaying a first color; a second pixel displaying a second color; and a third pixel displaying a third color; wherein each of the first, second, and third pixels comprise a first translucent member, a second translucent member disposed on the first translucent member, an intermediate member disposed between the first and second translucent members, and a pixel electrode disposed on the second translucent member.