LCD Hot Pixel Repair via UV Laser Microcavity Formation
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Solution Overview
Problem
Current methods for repairing hot pixel defects in liquid crystal display devices often result in additional defects, such as light leakage or afterimage issues, due to the damage caused by cutting wiring units or carbonizing substrates, and are not widely applicable or efficient.
Innovation Solution
A method involving the formation of a microcavity in the overcoat layer using a laser beam with a wavelength range of 200-400 nanometers, which absorbs ultraviolet light to generate thermal energy and ablate the material, creating a microcavity to block light paths without damaging surrounding components, and processing light blocking members to diffuse particles for effective repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wiring units are cut or substrates are carbonized to repair hot pixel defects, then defective pixels can be repaired, but additional defects such as light leakage or afterimage issues occur
Solution Approach 1:
The invention divides the repair process into distinct stages: first forming a microcavity in the overcoat layer, then filling it with light blocking material. This segmentation allows precise control over where and how light blocking occurs, preventing the harmful side effects of traditional methods that affect surrounding areas.
Solution Approach 2:
The invention applies light blocking properties locally only to the defective pixel region by forming a microcavity and filling it with light blocking material. This localized approach ensures that only the necessary area is modified, preventing light leakage and afterimage defects in surrounding healthy pixels while maintaining overall display quality.
2Reliability
If traditional repair methods are used, then hot pixel defects can be addressed, but the repair process damages surrounding components and reduces overall display quality
Solution Approach 1:
The invention extracts the problematic repair approach by removing the need to cut wiring or carbonize substrates. Instead, it creates an isolated microcavity structure that achieves light blocking without affecting surrounding components, thereby maintaining manufacturing precision and overall display quality while still repairing defective pixels.
Solution Approach 2:
The invention introduces a microcavity as an intermediary structure between the substrate and the overcoat layer. This microcavity serves as a controlled medium to contain light blocking material, enabling precise repair of hot pixel defects without the collateral damage to surrounding components that occurs with traditional direct cutting or carbonization methods.
3Reliability
If different repair methods are used for different pixel colors, then repair effectiveness can be optimized, but facility complexity and production time increase
Solution Approach 1:
The invention creates a universal repair method that works for all pixel colors (red, green, blue, etc.) by using the same microcavity formation and filling process regardless of the underlying color filter. This single approach replaces the need for color-specific repair procedures, simplifying facilities and improving production yield while maintaining high repair effectiveness across all pixel types.
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 method effectively repairs hot pixel defects while preventing foreign substances from entering the liquid crystal layer, improving display quality and unifying repair facilities by using the same laser beam for all pixel colors, thus enhancing production yield and minimizing additional defects.
Implementation Method 1
providing a liquid crystal display device including a substrate, a light blocking member disposed on the substrate, and an overcoat layer which is disposed on the substrate and the light blocking member and which contains a material capable of absorbing ultraviolet light of a wavelength range from 200 nanometers to 400 nanometers
Implementation Method 2
irradiating the overcoat layer with a laser beam having a wavelength range from 200 nanometers to 400 nanometers to form a microcavity between the substrate and the overcoat layer
Implementation Method 3
irradiating the overcoat layer with a laser beam having a wavelength range from 200 nanometers to 400 nanometers to form a microcavity between the substrate and the overcoat layer
Implementation Method 4
a second laser beam irradiating step of irradiating a laser beam on the light blocking member on the substrate so as to process the light blocking member
Implementation Method 5
a third laser beam irradiating step of diffusing light blocking member particles generated by processing the light blocking member into the microcavity
Data Source
AI summary
A method of repairing a liquid crystal display device, the method including, providing a liquid crystal display device including a substrate, a light blocking member disposed on the substrate, and an overcoat layer which is disposed on the substrate and the light blocking member and which contains a material capable of absorbing ultraviolet light having a wavelength range from 200 nanometers to 400 nanometers; and irradiating the overcoat layer with a laser beam having a wavelength range from 200 nanometers to 400 nanometers to form a microcavity between the substrate and the overcoat layer to repair the liquid crystal display.