TFT Array Substrate Light-Absorbing Layer for Copper Signal Reflection
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Solution Overview
Problem
Existing thin film transistor array substrates face issues with unwanted reflection of external light, which affects the display quality, and there is a need for reliable signal lines to prevent signal disruptions in display devices like liquid crystal and organic light emitting display devices.
Innovation Solution
The substrate includes a light-absorbing layer that directly contacts and partially covers the gate line, data line, source electrode, and drain electrode, which are made of copper, and a trench structure in the insulating film to optimize the placement and thickness of these elements, minimizing reflection and ensuring stable signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper signal lines are used to improve electrical conductivity, then signal transmission reliability is improved, but unwanted reflection of external light increases
Solution Approach 1:
A light-absorbing layer is introduced as an intermediary between the copper signal lines and the external light. This layer absorbs the external light before it can reflect off the copper lines, thereby eliminating the harmful reflection while preserving the electrical conductivity of the copper signal lines.
Solution Approach 2:
The light-absorbing layer is selectively applied only to regions where signal lines are present, rather than covering the entire substrate. This localized approach addresses the reflection problem specifically where copper lines exist, while maintaining transparency and other optical properties in regions where signal lines are absent.
2Reliability
If signal line thickness is increased to improve reliability, then signal transmission stability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The solution separates the electrical function (copper signal lines) from the optical function (light absorption). By using a distinct light-absorbing layer instead of increasing copper line thickness, the structure remains segmented and modular, avoiding the need for thicker or more complex copper structures while still achieving both reliability and light reflection prevention.
3Illumination intensity
If light-absorbing layer is added to minimize reflection, then display quality is improved, but manufacturing process complexity increases
Solution Approach 1:
The light-absorbing layer formation process is merged with existing manufacturing steps. The layer is formed using standard deposition techniques that are already part of the thin-film transistor fabrication process, and the patterning is integrated with other layer formation steps, thereby minimizing additional manufacturing complexity while achieving improved display quality.
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 effectively reduces unwanted reflection and enhances the display quality by stabilizing the signal lines and preventing signal disruptions, while also allowing for a fine pattern implementation and optimized aperture ratio in display devices.
Implementation Method 1
a light-absorbing layer that directly contacts and partially covers the gate line, data line, source electrode, and drain electrode
Data Source
AI summary
A transistor array substrate includes a substrate (having a first trench), a gate electrode (in the first trench), an insulating film, a gate line, a data line, a source electrode, and a drain electrode. The insulating film includes second, third, fourth, fifth, and sixth trenches. The gate line is in the second trench and is not parallel to the data line. The data line includes a first section and a second section that are separated by the gate line and respectively in the third and fourth trenches. The source electrode and the drain electrode are respectively in the fifth and sixth trenches. The source electrode is electrically connected to the data line. The gate electrode is electrically connected to the gate line.