Inkjet Printing Base With Extension Base For PLED Drying
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Solution Overview
Problem
In the manufacturing of PLEDs, inconsistent drying rates between edge and center pixels due to varying drying atmospheres lead to non-uniform thickness of the pixel thin film, affecting display quality, and the use of a test area to maintain consistency reduces the display area and increases bezel width.
Innovation Solution
A printing base with an extension base and gas injection system that creates a solvent atmosphere around the substrate by injecting a gas mixture of inertia and solvent gases through inclined holes, ensuring consistent drying rates between edge and center pixels, thereby eliminating the need for a test area and increasing the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a test area is provided at the periphery of the display area to maintain consistent drying rates, then the drying uniformity is improved, but the display area is reduced and bezel width increases
Solution Approach 1:
A solvent atmosphere layer is introduced as an intermediary between the inkjet-printed pixels and the surrounding environment. This solvent atmosphere, maintained by controlled evaporation from the periphery, mediates the drying process to ensure uniform solvent removal across the entire pixel array, eliminating the need for a separate test area while maintaining drying consistency.
Solution Approach 2:
The drying conditions are controlled by adjusting parameters such as ambient temperature, humidity, and air flow to create optimal evaporation conditions. By precisely controlling these parameters, the solvent atmosphere maintains consistent concentration and temperature gradients across the substrate, ensuring uniform drying rates throughout the display area without requiring peripheral test regions.
2Device complexity
If inkjet printing is performed directly on the substrate without solvent atmosphere control, then the process is simpler, but non-uniform thickness of pixel thin film occurs
Solution Approach 1:
Before the inkjet printing and drying process, the substrate is pre-treated by applying a uniform layer of solvent or by pre-establishing controlled environmental conditions. This preliminary action ensures that the solvent atmosphere is already in place to facilitate uniform evaporation during the subsequent drying process, preventing non-uniform thin film formation without adding complex equipment.
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 solution ensures uniform drying rates and thickness of the pixel thin film, reducing bezel width and enhancing display quality by maintaining consistent drying atmospheres across the substrate, thus increasing the usable display area.
Implementation Method 1
a vacuum pump (3), and a gas injection valve (4); The vacuum pump (3) is connected with the absorbing holes
Implementation Method 2
the gas injection valve (4) is connected with the at least one injecting hole, and is used for injecting a gas comprising at least a solvent gas for inkjet printing from the at least one injecting hole to the periphery of the carrying base, to form a solvent atmosphere
Data Source
AI summary
A printing base comprises: a carrying base, an extension base, a vacuum pump and a gas injection valve; the extension base is located at the periphery of the carrying base; the surface of the carrying base has at least one absorbing hole for absorbing the substrate, and the surface of the extension base has at least one injecting hole. By adding a extension base at the periphery of the carrying base, the invention can avoid the provision of test area at the periphery of the display area on the substrate, and increase the area of the display area, and in turn reduce the bezel width of the liquid crystal display panel.