Flow Guiding Portions in Color Resist for LCD Alignment Film Uniformity
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Solution Overview
Problem
Conventional liquid crystal display panels face issues with alignment films accumulating around via holes due to surface tension, leading to uneven film thickness and display abnormalities like Mura.
Innovation Solution
The introduction of flow guiding portions in the color resist layer, connected to via holes, alters the flow direction of the alignment liquid and increases pressure, preventing accumulation around the via holes, resulting in a more uniform film thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If inkjet printing is used to apply alignment film, then the alignment film can be formed on the array substrate, but the alignment film accumulates around the via holes due to surface tension, resulting in uneven film thickness
Solution Approach 1:
The patent applies a surfactant to the array substrate before inkjet printing the alignment film. This preliminary action reduces the surface tension of the substrate, preventing the alignment liquid from accumulating around via holes during the subsequent inkjet printing process, thereby achieving uniform film thickness
Solution Approach 2:
The surfactant acts as an intermediary substance between the inkjet-printed alignment liquid and the array substrate. It mediates the interaction by reducing surface tension, allowing the alignment liquid to flow uniformly without being repelled by high surface tension at the via hole edges
2Ease of manufacture
If the array substrate has been etched with lines and holes, then the driving circuit functionality is achieved, but the complicated surface topography causes alignment film spreading and extending difficulties
Solution Approach 1:
The surfactant treatment is performed as a preliminary step before alignment film deposition. This pre-treatment modifies the substrate surface properties to compensate for the complicated topography created by etching, enabling uniform alignment film formation despite the presence of lines and holes
Solution Approach 2:
The patent changes the surface energy parameters of the array substrate by applying a surfactant. This parameter change reduces surface tension, allowing the alignment liquid to spread uniformly across the complicated etched surface without accumulating in specific areas
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 flow guiding portions effectively redirect the alignment liquid into the via holes, reducing the occurrence of film thickness irregularities and display unevenness, ensuring a uniform alignment film on the array substrate.
Implementation Method 1
due to an effect of surface tension on the liquid, spreading and extending of the alignment film encounters large holes and cannot flow into the holes
Data Source
AI summary
The application provides an array substrate and a liquid crystal display panel. The array substrate includes a substrate, a driving circuit layer, a color resist layer, and a pixel electrode layer which are disposed in a stack. The color resist layer includes a flow guiding portion and a first via hole having an aperture diameter greater than a threshold. The flow guiding portion is connected to at least part of the first via hole and positioned on at least one of an inside and an outside of the first via hole, and a flow guiding surface of the flow guiding portion is connected to a part of an edge of the aperture of the first via hole. According to the present application, the shape of the aperture is changed so that an alignment liquid does not accumulate when flowing through.