Liquid Crystal Display Common Electrode Laser Repair
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in easily correcting defective pixels due to leakage current between conductive lines or electrodes, leading to bright spots appearing as black spots, and suffer from contact failure and short circuits during laser repair processes.
Innovation Solution
The solution involves disposing a common electrode in the upper layer of pixel electrodes with an insulating film in between, reducing the number of insulating films and contact holes, and using conductive lines and electrodes made of materials suitable for laser repair, allowing easy connection and correction of defective pixels without removing the common electrode at contact sites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common electrode is disposed in the lower layer of pixel electrodes, then the structure follows conventional design, but the number of insulating films and contact holes increases leading to more contact failure and short circuits during laser repair
Solution Approach 1:
The patent inverts the conventional layer arrangement by placing the common electrode in the upper layer and pixel electrodes in the lower layer. This inversion reduces the number of insulating films and contact holes required, thereby reducing contact failure and short circuits during laser repair while maintaining device functionality
2Ease of repair
If conventional materials are used for conductive lines and electrodes, then manufacturing is straightforward, but laser repair becomes difficult due to inability to easily connect electrodes
Solution Approach 1:
The patent changes the material parameters of conductive lines and electrodes by using materials with high laser absorption coefficients (such as metal materials) instead of conventional transparent conductive materials. This parameter change enables effective laser repair by allowing laser energy to be absorbed and generate sufficient heat for melting and connecting electrodes
3Reliability
If multiple insulating films are used between electrodes, then electrical insulation is improved, but the complexity of laser repair increases and defective pixel correction becomes difficult
Solution Approach 1:
The patent extracts and removes unnecessary insulating films from the conventional structure. By eliminating redundant insulating layers while maintaining essential electrical insulation, the structure enables easier laser penetration and repair operations without compromising electrical isolation between conductive elements
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 enables easy laser repair of defective pixels, reduces contact failure and short circuits, and stabilizes the potential of the common electrode, improving the reliability and efficiency of liquid crystal display devices.
Implementation Method 1
the laser melting technique is used which irradiates the corresponding overlapping portion of the drain lead line and the auxiliary capacitance line with a laser beam
Data Source
AI summary
The present invention provides a liquid crystal display device for which laser repair can be easily performed to correct a defect pixel, and/or a liquid crystal display device capable of reducing generation of contact failure and a short circuit. The liquid crystal display device of the present invention includes a first substrate, a liquid crystal layer, and a second substrate in the given order. The first substrate includes: an insulating substrate; a scanning line; a data line; a first insulating film disposed between the scanning line and the data line; a common line extending in an extension direction of the scanning line or the data line; a counter electrode facing the common line with the first insulating film in between; a switching element being connected to the scanning line and the data line; a second insulating film; a pixel electrode being connected to the switching element and the counter electrode; a third insulating film; and a common electrode being provided with an opening. The switching element, the second insulating film, the pixel electrode, the third insulating film, and the common electrode are disposed in the given order toward the liquid crystal layer.