Array Substrate Flow Guiding Grooves for Alignment Layer Coating
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Solution Overview
Problem
Current liquid crystal display panel manufacturing processes face challenges in preventing the accumulation or backflow of alignment layer liquid solution onto conductive connection lines near the acute portion of the fan out area, especially in high-resolution and large-size displays, due to limitations in coating precision and design constraints.
Innovation Solution
The implementation of an array substrate with flow guiding grooves between conductive connection lines, extending from the inner substrate towards the edge, which directs the liquid solution away from the acute portion and ensures it does not flow back to the effective display area, while maintaining the existing production process integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spray coating method is used to apply alignment layer liquid solution, then coating efficiency is improved, but coating precision deteriorates especially in high-resolution large-size displays
Solution Approach 1:
The patent introduces flow guiding grooves as an intermediary structure between the conductive connection lines and the alignment layer liquid solution. These grooves act as channels that guide the liquid solution flow, preventing it from accumulating on conductive connection lines or flowing back to the effective display area, thus enabling spray coating to achieve both high efficiency and precision
2Reliability
If retaining walls are designed on color filter substrate to prevent liquid solution flow, then liquid solution containment is improved, but device complexity increases
Solution Approach 1:
Instead of adding retaining walls on the color filter substrate as conventional approaches do, the patent inverts the approach by creating flow guiding grooves on the array substrate side. These grooves actively guide the liquid solution flow in the desired direction rather than passively blocking it, thereby achieving containment with simpler structure
3Ease of manufacture
If fan out area is designed with adequate peripheral wiring region, then signal line arrangement is improved, but liquid solution accumulation risk increases at acute portion
Solution Approach 1:
The patent applies local quality by creating flow guiding grooves specifically at the acute portion of the fan out area where liquid solution accumulation occurs. These grooves are strategically positioned only where needed to guide liquid solution away from conductive connection lines, while leaving other areas unchanged, thus resolving the contradiction locally without affecting overall design
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 effectively prevents liquid solution accumulation on conductive connection lines and maximizes fluidity of the alignment layer, ensuring accurate coating and photo-curing during substrate joining without affecting the display panel's frame size or resolution requirements.
Implementation Method 1
a plurality of flow guiding grooves are formed between the plurality of conductive connection lines and have longitudinal direction extending from the inner of the substrate toward to the edge of the substrate
Data Source
AI summary
A array substrate comprises a substrate including a displaying area and a plurality of fan out areas surrounding the displaying area, and a plurality of thin film transistors and a plurality of pixel units disposing on the displaying area. A plurality of driving units are disposed on a border of the substrate and are electrically connected to the plurality of signal lines. A plurality of conductive connection lines are separately disposed between the plurality of driving units and are located on the fan out areas, and electrically connected to the plurality of driving units. Wherein a plurality of flow guiding grooves are formed between the plurality of conductive connection lines and have longitudinal direction extending from the inner of the substrate toward to the edge of the substrate, and each of the plurality of flow guiding grooves is in a shape of line.