Array Substrate Via Formation with Mobilized Insulating Material
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Solution Overview
Problem
Conventional array substrates suffer from poor contact between the pixel electrode and the drain electrode due to a barbed via structure formed during the etching process, leading to fractured pixel electrode layers and surface irregularities.
Innovation Solution
The method involves forming a via extending through a first insulating layer and a second insulating layer, with a first sub-via in the first layer and a second sub-via in the second layer, mobilizing and distributing the first insulating layer material over the sidewall of the second sub-via, and curing to form a smooth film that extends from the first sub-via to the second sub-via, ensuring a flat surface transition and eliminating surface irregularities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a via is formed by etching through both insulating layers using conventional methods, then the via structure is created, but barbed via structures and surface irregularities are formed causing poor contact between electrodes
Solution Approach 1:
The patent applies preliminary action by performing a first etching process to form a via in the first insulating layer, then filling it with curable material and curing before performing the second etching process through the second insulating layer. This sequential approach prevents the formation of barbed via structures by establishing a stable foundation first, then adding the second layer without causing surface irregularities that would compromise electrode contact quality.
Solution Approach 2:
The patent segments the via formation process into two distinct sub-vias: a first sub-via through the first insulating layer and a second sub-via through the second insulating layer. This segmentation allows each layer to be processed independently with optimized etching parameters, preventing the formation of barbed structures that occur when etching through multiple layers simultaneously, thereby ensuring smooth surface transitions and reliable electrode contact.
2Ease of manufacture
If the first insulating layer is made resistant to the etching of the second insulating layer, then the second insulating layer can be etched without affecting the first layer, but additional process steps are required to achieve this selectivity
Solution Approach 1:
The patent applies local quality by making the first insulating layer selectively resistant to the etching chemistry used for the second insulating layer. The first layer is formulated with specific material properties (such as using a different resin composition or cross-linking density) that provide etch selectivity, allowing the second layer to be removed while preserving the first layer's integrity and the cured material within the via.
Solution Approach 2:
The patent changes material parameters of the first insulating layer to achieve etch resistance. By adjusting the chemical composition, cross-linking degree, or physical properties of the first layer's curable material after curing, the layer becomes resistant to the plasma or chemical etching process used for the second insulating layer, eliminating the need for additional protective layers or complex process steps.
3Reliability
If the curable material is cured at high temperature for extended duration, then complete curing and material stability are achieved, but processing time and energy consumption increase
Solution Approach 1:
The patent changes the curing parameters by using elevated temperatures (such as 80°C to 150°C or higher) to accelerate the curing kinetics of the curable material. This parameter change enables complete cross-linking and material stabilization in a shorter time frame, reducing the curing duration from hours to minutes or seconds while achieving the same or better material stability and etch resistance.
Solution Approach 2:
The patent applies periodic action by using pulsed or intermittent curing cycles instead of continuous prolonged heating. The curable material is subjected to periodic thermal or UV treatment cycles that achieve complete curing through repeated exposure, reducing the total processing time while ensuring thorough material transformation and stability.
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 approach results in a smooth inner surface transition between the insulating layers, preventing barbed via structures and improving contact quality between the pixel and drain electrodes, thus enhancing the array substrate's performance by eliminating fractured pixel electrode layers and surface irregularities.
Implementation Method 1
the first insulating layer is made of a curable material, and the step of mobilizing and distributing are performed by curing the first insulating layer
Data Source
AI summary
The present application discloses a method of fabricating an array substrate comprising forming a via extending through a first insulating layer and a second insulating layer, the via comprising a first sub-via in the first insulating layer and the second sub-via in a second insulating layer; mobilizing a portion of first insulating layer material surrounding the first sub-via; and distributing the mobilized portion of the first insulating layer material over a sidewall of the second sub-via.