WOLED Insulating Layer Prevents Color Mixing
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Solution Overview
Problem
Existing white organic light-emitting diode (WOLED) components suffer from color mixing issues due to the horizontal charge transmission between adjacent light-emitting units, leading to degraded display effects over time as the bonding capability between organic molecules and elemental lithium in the charge generation layer ages.
Innovation Solution
A WOLED component manufacturing method involving a substrate, pixel defining layer, first electrodes, insulating layer, and charge generation layer, where the insulating layer separates adjacent first electrodes, preventing horizontal charge transmission between light-emitting units and thus avoiding color mixing, with the insulating layer configured to have a shape that casts a shadow on the pixel defining layer, facilitating the deposition of layers without a mask.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If charge generation layer is formed without mask to simplify manufacturing, then manufacturing precision deteriorates due to color mixing between adjacent light-emitting units
Solution Approach 1:
An insulating layer is introduced as an intermediary structure between adjacent light-emitting units. This insulating layer acts as a physical barrier that prevents charge carriers from horizontally transmitting between neighboring units, thereby eliminating color mixing while allowing the charge generation layer to be formed without a mask. The insulating layer includes side surfaces that extend downward to block charge transmission paths.
Solution Approach 2:
The charge generation layer is segmented into isolated regions corresponding to individual light-emitting units by the insulating layer. This segmentation prevents the continuous horizontal transmission of charges between adjacent units, ensuring that each unit's charge generation layer operates independently without interfering with neighboring units.
2Reliability
If insulating layer thickness is increased to prevent color mixing, then device complexity increases due to additional structural requirements
Solution Approach 1:
The insulating layer is designed with non-uniform thickness distribution, featuring thicker regions at the sides and thinner regions at the center. The side portions have sufficient thickness to block horizontal charge transmission, while the center portion maintains appropriate thickness for device operation. This local quality variation optimizes both color mixing prevention and device simplicity.
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
The solution effectively prevents color mixing and enhances the display effect by ensuring that only adjacent light-emitting units are activated, maintaining the white light emission and extending the lifespan of the WOLED component.
Implementation Method 1
the insulating layer and the charge generation layer are configured such that after formation of the charge generation layer, portions thereof positionally corresponding to any two adjacent first electrodes are physically separated by the insulating layer
Implementation Method 2
the insulating layer can be configured such that an orthographic projection of a side surface thereof facing any one of the plurality of first electrodes on an upper surface of the pixel defining layer casts a shadow thereupon
Implementation Method 3
when the charge generation layer transmits charges to the first light-emitting layer of the light-emitting unit vertically
Implementation Method 4
an organic light-emitting diode (OLED) component
Data Source
AI summary
An organic light-emitting diode (OLED) component includes a substrate; a pixel defining layer and a plurality of first electrodes over the substrate; an insulating layer correspondingly disposed over the pixel defining layer; a first light-emitting layer over each first electrode; and a charge generation layer over the first light-emitting layer. The plurality of first electrodes are physically separated from one another by the pixel defining layer. The insulating layer is configured to facilitate manufacturing of the OLED component, such that after formation of the charge generation layer without a mask, portions thereof positionally corresponding to any two adjacent first electrodes are physically separated by the insulating layer. The OLED component can be a white light organic light-emitting diode (WOLED) component including at least one other light-emitting layer in addition to the first light-emitting layer.