Electrostatic Protective Layer Laser Repair for Display Bright Spot Defects
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Solution Overview
Problem
The manufacturing of liquid crystal display panels often results in bright spot defects due to fine particles on thin film transistors, which conventional laser-based repair methods can damage other components, leading to a black halo phenomenon and impaired display functions.
Innovation Solution
A method involving the formation of an electrostatic protective layer with a thickness of 1000 nm to 2500 nm, made from organic transparent conductive materials like PEDOT, which is carbonized using a laser to create a carbonization structure that shields defects without damaging surrounding components, thereby simplifying the repair process and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the color filter is carbonized using a laser to repair bright spots, then the bright spot defect is eliminated, but other internal components such as the transparent conductive layer are damaged causing a black halo phenomenon
Solution Approach 1:
The invention divides the functional layer into two separate layers: an electrostatic protective layer and a color filter layer. The electrostatic protective layer is positioned between the substrate and the color filter, allowing laser energy to be absorbed and scattered before reaching the color filter and other sensitive components. This segmentation enables defect repair while protecting other layers from damage.
Solution Approach 2:
The electrostatic protective layer serves as an intermediary layer that absorbs and scatters laser energy. When laser is applied to repair bright spot defects, this intermediate layer prevents excessive energy from reaching the color filter and transparent conductive layer, thereby avoiding the black halo phenomenon while still enabling effective defect elimination.
2Device complexity
If the color filter is disposed inside the display panel to perform its function, then the display structure is compact, but laser irradiation easily damages other internal components
Solution Approach 1:
The electrostatic protective layer is formed beforehand on the substrate before depositing the color filter layer. This pre-positioned protective layer acts as a cushion that absorbs and scatters laser energy during subsequent repair operations, protecting the color filter and other internal components from damage while maintaining the compact display structure.
3Reliability
If conventional laser-based repair methods are used, then bright spot defects can be eliminated, but the repair process becomes complicated and may damage surrounding components
Solution Approach 1:
The electrostatic protective layer is formed during the manufacturing process before the display panel is completed. This preliminary action ensures that the protective layer is already in place to guide and protect during subsequent laser repair operations, simplifying the repair process and eliminating the need for complex repair procedures.
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 effectively repairs bright spots with a high success rate, reducing the complexity of the manufacturing process, minimizing product defects, and enhancing display quality while maintaining the integrity of other components, achieving a success rate of 96% or more compared to conventional methods.
Implementation Method 1
irradiating a laser onto the electrostatic protective layer when a defect is found in the display panel, such that a carbonization structure is formed in the electrostatic protective layer at a position corresponding to the defect
Data Source
AI summary
A method for manufacturing a display panel is disclosed. The method includes: forming a color filter and a transparent conductive film on a surface of a first substrate, the color filter being interposed between the first substrate and the transparent conductive film; forming an electrostatic protective layer on the other surface of the first substrate; forming another transparent conductive film on a second substrate; forming a light-valve molecular layer between the first substrate and the second substrate; performing a defect inspection in the display panel; and irradiating a laser onto the electrostatic protective layer when a defect is found in the display panel, such that a carbonization structure is formed in the electrostatic protective layer at a position corresponding to the defect.