TFT Array Substrate Laser Patterning Without Photo Masks
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Solution Overview
Problem
Conventional laser ablation processes for TFT array substrate fabrication require photo masks, leading to high costs and complex machine integration due to the need for selective patterning, which complicates large area exposure and alignment.
Innovation Solution
A laser ablation process without the use of photo masks is employed to selectively pattern a conductive layer on a TFT array substrate, reducing fabrication costs by directly removing the conductive layer from organic or inorganic passivation layers, thereby retaining it only on specific regions such as the pixel, contact pad, and storage capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional laser ablation process with photo mask is used, then selective patterning of conductive layer is achieved, but fabrication cost increases and machine integration becomes complex
Solution Approach 1:
The patent extracts and removes the photo mask component from the laser ablation process. Instead of using a photo mask to define the pattern, the invention directly patterns the conductive layer through laser ablation alone, eliminating the alignment and integration complexity associated with photo masks while maintaining selective patterning capability
Solution Approach 2:
The patent replaces the mechanical/photochemical system of photo mask alignment and exposure with a direct laser ablation system. The laser beam itself becomes the patterning tool, substituting the complex photo mask alignment mechanism with a more straightforward laser scanning or focusing approach
2Manufacturing precision
If photo mask is used in laser ablation, then selective patterning is possible, but large area exposure becomes difficult
Solution Approach 1:
The patent introduces dynamic control of the laser beam parameters (such as scanning speed, focal position, or pulse duration) to achieve selective patterning across large areas. By dynamically adjusting laser parameters during the ablation process, the system can maintain precision while covering extensive substrate areas without requiring large photo masks
Solution Approach 2:
The patent transitions from a two-dimensional photo mask plane to a three-dimensional laser processing approach. The laser can focus at different depths, scan in multiple directions, and adjust its focal point, adding temporal and spatial dimensions to the patterning process that enable large area coverage while maintaining selectivity
3Manufacturing precision
If five photo mask processes are used for TFT array substrate fabrication, then complete device formation is achieved, but fabrication cost and process complexity increase
Solution Approach 1:
The patent merges multiple separate photo mask processes into a single integrated laser ablation step. By combining the patterning functions that previously required five separate photo mask exposures into one unified laser processing operation, the invention reduces process complexity and improves fabrication efficiency while maintaining the accuracy needed for complete TFT device formation
Solution Approach 2:
The patent makes the laser ablation process universal and multi-functional, enabling it to perform multiple patterning tasks that previously required different photo mask processes. The laser system can selectively remove material in different regions and at different times to create all necessary device structures, replacing the specialized sequence of five photo mask processes with a single versatile technique
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 simplifies the fabrication process, reduces costs, and improves machine integration by eliminating the need for photo masks, allowing for more efficient and cost-effective production of TFT array substrates for LCDs.
Implementation Method 1
applying a laser ablation process to remove the conductive layer on the organic material layer so that the conductive layer remains on the pixel region, on the part of the contact pad, on the part of the TFT, and on the part of the storage capacitor
Data Source
AI summary
The invention provides a method for manufacturing an array substrate utilizing a laser ablation process. A conductive layer can be selectively patterned by the laser ablation process without a photo mask due to different adhesions between the conductive layer and other materials. The patterned conductive layer thus formed adjoins an inorganic passivation layer to provide a substantially continuous surface.