LCD Light Blocking Layer for Laser Marking Reliability
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Solution Overview
Problem
The existing LCD display devices face substrate damage and crack generation due to high energy pulsed laser beams used for writing identification marks, which can lead to reliability issues and external impact vulnerabilities.
Innovation Solution
An LCD device design that incorporates a light blocking layer formed in the same layer as the identification mark layer, using materials like titanium, chromium, or molybdenum, with a thickness of 300-500 angstroms, to block light and reduce the energy required for marking, thereby preventing substrate cracks and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high energy pulsed laser beam is used to write identification marks on the identification mark layer, then the identification mark can be formed, but cracks are generated in the insulation layers and substrate damage occurs
Solution Approach 1:
The patent extracts the identification mark writing function from the gate/data line formation process by using a separate identification mark layer. This allows the identification mark to be written independently without requiring high energy that would damage the substrate, thus resolving the contradiction between mark formation and substrate integrity.
Solution Approach 2:
The identification mark layer serves as an intermediary between the substrate and the laser beam. It absorbs the laser energy for mark formation while protecting the underlying insulation layers and substrate from damage, thus preventing cracks while enabling identification mark writing.
2Ease of manufacture
If the identification mark layer is formed in the same metal layer as gate or data lines, then the marking can be done, but high energy laser beam is required which causes cracks in insulation layers
Solution Approach 1:
The patent segments the metal layers into separate functional layers: gate lines, data lines, and identification mark layer. This segmentation allows the identification mark layer to be optimized specifically for low-energy laser marking without compromising the electrical functionality of other metal layers, thus preventing crack generation while maintaining manufacturing ease.
Solution Approach 2:
The patent applies local quality by creating a dedicated identification mark layer with specific material properties optimized for laser marking. This layer has different characteristics from the gate and data line layers, allowing it to respond to low-energy laser beams without causing cracks in the insulation layers, thus resolving the contradiction between ease of manufacture and harmful effects.
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 prevents substrate cracks and enhances the reliability of LCD devices by using a low energy pulsed laser beam for writing identification marks, reducing power consumption and improving endurance against external impacts.
Implementation Method 1
a light blocking layer configured to block light being irradiated to a semiconductor layer of the thin film transistor
Implementation Method 2
The identification mark can be written on the identification mark layer by a pulsed laser beam in an intaglio shape
Data Source
AI summary
Discussed is an LCD device which includes: a substrate; an array cell formed on the substrate and defined into a display area and a non-display area; a thin film transistor formed on the display area of the array cell; a light blocking layer configured to block light being irradiated to a semiconductor layer of the thin film transistor; and an identification mark layer used for writing information about the array cell and formed in the same layer as the light block layer.