Dummy Thin Film Transistor for Driving Performance Consistency
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Solution Overview
Problem
Thin film transistor substrates face challenges in maintaining driving performance due to variations in manufacturing processes, particularly in the exposure of photoresist layers, which affect the width and shape of the channel, leading to inconsistent transistor performance.
Innovation Solution
A thin film transistor substrate design featuring a gate electrode on an insulating substrate with semiconductor layers and spaced source and drain electrodes, including dummy transistors without semiconductor layers between them, and a manufacturing method using a mask with transmissive, light-shielding, and transflective regions to control light exposure and etching, ensuring consistent channel formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the photoresist layer is exposed to light during manufacturing, then the channel width and shape of the thin film transistor are determined, but variations in light radiation cause inconsistencies in driving performance
Solution Approach 1:
The patent applies parameter changes by introducing a dummy thin film transistor without a semiconductor layer to compensate for variations in channel width caused by light radiation inconsistencies. By adjusting the area of the dummy transistor, the overall driving performance remains consistent even when manufacturing conditions vary, directly addressing the contradiction between manufacturing precision and reliability
Solution Approach 2:
The dummy thin film transistor serves as a preliminary compensatory element that counteracts the potential negative effects of manufacturing variations before they impact the overall device performance. By pre-introducing this compensating structure, the system maintains consistent driving performance despite inconsistencies in channel formation during manufacturing
2Reliability
If the channel width is increased to improve driving performance, then the transistor conductivity increases, but the manufacturing process variations cause unpredictable performance changes
Solution Approach 1:
The patent changes the structural parameters by adding a dummy transistor element with adjustable area. This allows the overall system to maintain desired driving performance by compensating for manufacturing variations, enabling reliable performance without requiring extremely precise channel width control during manufacturing
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 allows for consistent driving performance across different manufacturing processes by balancing the channel width and length of transistors, enhancing the reliability and efficiency of the thin film transistor substrate.
Implementation Method 1
radiating light to the photoresist layer through a mask to form a photoresist pattern
Implementation Method 2
the mask including a transmissive region that transmits light, a light-shielding region that shields light, and first and second transflective regions that partially transmit light
Implementation Method 3
etching the data wiring conductive film using the photoresist pattern to form a source electrode and a drain electrode
Data Source
AI summary
A thin film transistor substrate capable of appropriately maintaining driving performance even when there is a difference between manufacturing processes and a method of manufacturing the same. The thin film transistor substrate includes: a gate electrode formed on an insulating substrate; a semiconductor layer formed on the gate electrode; and a plurality of thin film transistors each having a source electrode and a drain electrode that are formed on the gate electrode and the semiconductor layer so as to be spaced apart from each other. At least one of the plurality of thin film transistors is a dummy thin film transistor that does not have the semiconductor layer between the source electrode and the drain electrode.