Vacuum Drying Condenser Temperature Gradient for OLED Ink Uniformity
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Solution Overview
Problem
Existing OLED display panels experience uneven display due to different drying rates of ink in edge and center areas during the vacuum drying process, leading to inconsistent evaporation of solvents.
Innovation Solution
A vacuum drying apparatus with a cavity, abutment, and condenser configuration where the condenser has a temperature gradient, with a first part facing the center area and a second part surrounding it, set to have a lower temperature than the abutment, to control and balance the evaporation rate of solvents across the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional vacuum drying apparatus with uniform temperature is used, then the structure is simple, but the evaporation rate of solvents differs between edge and center areas causing uneven display
Solution Approach 1:
The condenser is designed with non-uniform temperature distribution where the first part (facing center area) has a lower temperature than the second part (surrounding area). This local quality variation compensates for the different evaporation rates at edge and center areas, achieving uniform ink drying across the substrate.
Solution Approach 2:
The temperature parameter of the condenser is varied spatially to create a temperature gradient. By controlling the temperature of different parts of the condenser to be different, the evaporation rate of solvents is balanced across the substrate, resolving the uneven drying problem.
2Manufacturing precision
If the condenser temperature is reduced to slow evaporation, then the overall drying time increases, but the edge area dries too fast compared to center area
Solution Approach 1:
Different regions of the condenser are assigned different temperatures: the first part (facing center) has lower temperature to slow evaporation there, while the second part (surrounding) has higher temperature to maintain faster evaporation at edges. This local differentiation achieves overall evaporation rate uniformity.
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 reduces the difference in evaporation rates between edge and center areas, minimizing the risk of uneven display in OLED panels by ensuring consistent drying of the ink layers.
Implementation Method 1
a vacuum dry (VCD) process is required to remove solvents from ink and leave solutes in the ink to form OLED functional layers
Implementation Method 2
vacuum drying apparatus, including: a cavity; an abutment disposed within the cavity
Implementation Method 3
the second side includes a first part configured to face a center area of the substrate and a second part surrounding the first part, and a temperature of the first part is lower than a temperature of the second part
Data Source
AI summary
The present disclosure provides a vacuum drying apparatus, a vacuum drying method, and a display panel; the vacuum drying apparatus includes a cavity, and an abutment and a condenser disposed within the cavity; the abutment includes a first side configured to carry a substrate and having a first temperature; the condenser includes a second side facing the first side and having a second lower than temperature lower than the first temperature; the second side includes a first part configured to face a center area of the substrate and a second part surrounding the first part, and a temperature of the first part is lower than a temperature of the second part.