TFT Mask Light-Adjusting Pattern for Channel Length Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The reduction in the number of masks used in manufacturing thin-film transistor (TFT) substrates for liquid crystal display devices increases manufacturing costs and restricts the length of the channel, affecting the electrical characteristics of the TFTs.
Innovation Solution
A mask design incorporating a drain mask pattern, a source mask pattern, and a light-adjusting pattern, with a single slit or translucent layer to control light exposure, allowing for a shorter channel length and improved electrical characteristics by blocking external light and optimizing the channel width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of masks is decreased to reduce manufacturing complexity, then device complexity is reduced, but manufacturing precision deteriorates due to restricted channel length
Solution Approach 1:
The mask is divided into multiple functional patterns: drain mask pattern, source mask pattern, and light-adjusting pattern. Each pattern serves a specific purpose in controlling light exposure to achieve precise channel length and width definition while using a single mask structure.
Solution Approach 2:
A light-adjusting pattern is introduced as an intermediary element between the source and drain mask patterns. This light-adjusting pattern controls light exposure in the channel region, enabling precise channel length definition without requiring additional masks.
2Reliability
If the channel length is reduced to improve electrical characteristics, then electrical conductivity improves, but manufacturing precision deteriorates due to difficulty in controlling short dimensions
Solution Approach 1:
The mask provides different light-blocking properties in different regions: the drain and source mask patterns provide complete light blocking at electrode regions, while the light-adjusting pattern provides controlled light adjustment in the channel region. This local differentiation enables precise control of short channel dimensions.
Solution Approach 2:
The mask uses a composite structure with transparent and opaque regions. The transparent substrate allows light transmission to the photoresist, while the opaque mask patterns (drain, source, and light-adjusting patterns) selectively block light to define precise channel dimensions.
3Device complexity
If a single mask is used to form multiple patterns, then device complexity is reduced, but manufacturing precision deteriorates due to light exposure control difficulties
Solution Approach 1:
The single mask is segmented into distinct functional patterns: drain mask pattern for defining drain electrode, source mask pattern for defining source electrode, and light-adjusting pattern for controlling channel region light exposure. Each segment performs a specific function to achieve precise pattern definition.
Solution Approach 2:
The light-adjusting pattern provides partial light blocking in the channel region, allowing controlled light exposure that is neither complete transmission nor complete blocking. This partial action enables precise control of the channel width and length in the photoresist patterning process.
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 solution enhances the electrical characteristics of TFTs by reducing the channel length and width, thereby improving the performance and efficiency of the TFT substrate manufacturing process while maintaining cost-effectiveness.
Implementation Method 1
The light-adjusting pattern is formed between each end portion of the source mask pattern and the drain mask pattern to block at least some light from entering a space between the source and drain mask patterns from the exterior
Implementation Method 2
The translucent layer covers a space between the drain and source mask patterns to partially transmit light
Data Source
AI summary
A mask that is capable of forming a thin-film transistor (TFT) with improved electrical characteristics is presented. The mask includes a drain mask pattern, a source mask pattern and a light-adjusting pattern. The drain mask pattern blocks light for forming a drain electrode. The source mask pattern blocks light for forming a source electrode and faces the drain mask pattern. A distance between the drain and source mask patterns is no more than the resolution of an exposing device. The light-adjusting pattern is formed between end portions of the source mask pattern and the drain mask pattern to block at least some light from entering a space between the source and drain mask patterns.