Multicolor OLED Display Shared Emitter Layer
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Solution Overview
Problem
Existing multicolor OLED displays face challenges in power efficiency due to the need for precise patterning of OLED layers, which increases manufacturing complexity and power consumption, especially since the human eye is less sensitive to red and blue light, requiring these pixels to emit more light and thus consume more power.
Innovation Solution
A multicolor OLED display design featuring at least three differently colored pixels with a shared light emitting layer for green and red pixels, and a separate layer for blue pixels, along with color filters to achieve the desired spectral components, reducing the need for precise alignment and patterning of OLED layers and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate OLED electroluminescent layers are provided for each pixel with precise patterning, then color accuracy is improved, but manufacturing complexity and alignment requirements increase
Solution Approach 1:
The patent merges the electroluminescent layers for red and green pixels into a single shared layer, eliminating the need for separate patterning of individual pixel layers. This combining approach maintains color accuracy while significantly reducing manufacturing complexity and alignment requirements
Solution Approach 2:
The shared electroluminescent layer serves multiple functions by providing light emission for both red and green pixels simultaneously. This multi-functional design allows a single layer to fulfill the roles of what would traditionally require separate dedicated layers for each pixel type
2Illumination intensity
If red and blue pixels emit more light to compensate for lower human eye sensitivity, then display brightness is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by providing enhanced light emission specifically in the green spectral region where human eye sensitivity is highest, while using the shared layer to efficiently provide red and blue components. This localized optimization of light emission characteristics improves overall display brightness perception without proportionally increasing power consumption across all color channels
3Productivity
If shadow masks are used for patterning OLED layers, then manufacturing throughput is improved, but alignment accuracy deteriorates and surface area is wasted
Solution Approach 1:
The patent extracts and removes the shadow mask component from the manufacturing process entirely. By eliminating the shadow mask requirement through the shared electroluminescent layer design, the method avoids the alignment accuracy problems and surface area waste associated with shadow mask usage while maintaining manufacturing throughput
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 design simplifies manufacturing, reduces power consumption by aligning and patterning fewer OLED layers, and achieves improved power efficiency by optimizing light emission spectra for each pixel type, leading to more efficient multicolor displays.
Implementation Method 1
an organic media sandwiched between these electrodes to support charge recombination that yields emission of light
Implementation Method 2
color filters to achieve the desired spectral components
Data Source
AI summary
An OLED display having at least first, second, and third differently colored pixels includes a first light emitting layer provided over a substrate for the first and second pixels and a second light emitting layer provided over the substrate for the third pixel wherein the first and second light emitting layers produce light having different spectra and the light produced by the first light emitting layer has substantial spectral components corresponding to the light output desired for the first and second pixels, and the light produced by the second light emitting layer has substantial spectral components corresponding to the light output desired for the third pixel, and first and second color filters in operative relationship with the first and second pixels.