Pattern Transcription Device for TFT Resist Fabrication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing pattern transcription methods for fabricating thin film transistor (TFT) resist patterns are complex, leading to increased production costs and decreased yield due to issues with resist material adherence and pattern transfer, particularly when using a conventional reverse offset method where the elastic blanket contacts the ground surface of the cliché, causing undesired resist patterns and difficulty in forming fine patterns.
Innovation Solution
A pattern transcription apparatus with a cliché featuring concave and convex portions, where a printing stopper with lower surface energy density than the blanket prevents resist material transfer to concave portions, and a multi-layered blanket with varying hardness and thickness to ensure proper pattern transfer without unwanted adherence, along with a method of forming these features using etching and surface energy manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the blanket contacts the ground surface of the concave portion of the cliché, then the resist material can be transferred to the cliché, but undesired resist patterns are formed and pattern precision deteriorates
Solution Approach 1:
The cliché surface is segmented into concave portions (for pattern transfer) and convex portions (for preventing unwanted transfer). By spatially separating the functional zones, the invention enables selective resist material transfer only to desired areas, eliminating undesired patterns while maintaining manufacturing precision.
Solution Approach 2:
The convex portions act as intermediary elements between the blanket and the concave portions. These convex portions prevent the blanket from contacting the ground surface of the concave portions, serving as mediators that control the transfer process and eliminate harmful unwanted resist patterns.
2Object-generated harmful factors
If the concave portion is made deeper to prevent blanket contact with the ground surface, then undesired resist patterns are reduced, but the critical dimension is lost and fine pattern formation becomes difficult
Solution Approach 1:
The invention transitions from a single-dimensional depth control approach to a two-dimensional surface topology approach. Instead of increasing concave portion depth vertically, the solution uses horizontal convex portions to achieve the same protective function, preserving critical dimensions while preventing unwanted resist patterns.
Solution Approach 2:
Instead of making the concave portions deeper to prevent blanket contact, the invention inverts the approach by adding convex portions that protrude into the concave portions. This inverted geometry achieves the same protective effect while maintaining the original critical dimensions of the concave portions.
3Reliability
If many process steps are used to fabricate the resist pattern, then the TFT characteristics can be improved, but production costs increase and production yield decreases
Solution Approach 1:
The invention merges multiple process steps into a single printing operation. The cliché integrates both the pattern definition and the protective functions, allowing simultaneous formation of the resist pattern without separate protective measures, thereby improving production yield while maintaining TFT characteristics.
Solution Approach 2:
The cliché serves multiple functions simultaneously: it defines the pattern geometry, controls resist material transfer, and prevents unwanted resist formation. This multi-functionality eliminates the need for separate process steps, improving productivity while maintaining reliable TFT characteristics.
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 improves the accuracy and yield of resist pattern formation by preventing unwanted resist material transfer to concave portions and maintaining the integrity of the pattern, allowing for the creation of fine patterns without the issues of undesired resist patterns and material loss, thus enhancing the TFT fabrication process.
Implementation Method 1
a surface energy density of the blanket is greater than a surface energy density of the printing stopper and is smaller than a surface energy of the cliché
Implementation Method 2
the resist material has a greater adhesive strength to the cliché20 than the blanket 30
Implementation Method 3
By applying UV light to the concave-counter pattern 34 and hardening it, a resist pattern 38 is formed on the process-object layer 11
Data Source
AI summary
A pattern transcription apparatus comprises a cliché including a concave portion, a convex portion and a printing stopper, the printing stopper formed on a bottom surface of the concave portion; and a blanket, on which a resist material layer is coated, rotatable on the cliché, wherein a surface energy density of the blanket is greater than a surface energy density of the printing stopper and is smaller than a surface energy of the cliché.