OLED Hole Injection Layer Thickness Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Large-sized OLEDs require increased thickness of the white OLED device to match optical paths of red, green, and blue light, leading to higher driving voltage requirements.
Innovation Solution
A display panel design where the thickness of the hole injection layer is correlated with the wavelength of the light emitted, using a nano material-based ink with varying thicknesses for blue, green, and red sub-pixels, and a method involving inkjet printing to form the hole injection layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the thickness of the white OLED device is increased to match optical paths of red, green, and blue light, then the optical path matching is improved, but the driving voltage increases
Solution Approach 1:
The patent applies local quality by differentiating the hole injection layer thickness across different sub-pixels based on their emission wavelengths. Blue sub-pixels receive a thinner hole injection layer while red sub-pixels receive a thicker layer, optimizing each local region's electrical characteristics to match its optical requirements without uniformly increasing overall device thickness
Solution Approach 2:
The patent changes the thickness parameter of the hole injection layer according to the wavelength parameter of emitted light. By establishing a correlation where thickness increases with wavelength, the patent optimizes hole injection efficiency for each color without requiring uniform thickness increase across the entire device, thereby avoiding proportional increases in driving voltage
2Manufacturing precision
If the thickness of the white OLED device is increased to match optical paths of red, green, and blue light, then the optical path matching is improved, but the overall device thickness increases
Solution Approach 1:
The patent implements local quality by assigning different hole injection layer thicknesses to different sub-pixel regions based on their wavelength requirements. This localized differentiation allows optical path matching to be achieved in each region without requiring a uniform increase in overall device thickness
Solution Approach 2:
The patent segments the hole injection layer into multiple thickness zones corresponding to different color sub-pixels. By dividing the layer into region-specific thicknesses rather than using a uniform thickness, the patent achieves optical path matching for each color while maintaining overall device thinness
Data Source
AI summary
A display panel and a method of manufacturing the same are provided. The display pane includes an array substrate; a plurality of pixel defining portions, the pixel defining portions spaced apart from each other on the array substrate; a plurality of pixel units, each of the pixel units including: a plurality of sub-pixels, each of the sub-pixels disposed between corresponding adjacent pixel defining portions, each of the sub-pixels including a light emitting layer for emitting light and a hole injection layer. A thickness of the hole injection layer is positively correlated with a wavelength of light emitted by a corresponding light emitting layer.