Laser-Melted Metal Piece for LCD Defective Pixel Correction
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Solution Overview
Problem
Liquid crystal display devices face issues with stuck pixels due to short circuits between the source and drain electrodes of thin film transistors, leading to bright spots, which existing technologies struggle to correct reliably.
Innovation Solution
A liquid crystal display device design that includes a metal piece formed in the same layer as the common signal line, located between the common and pixel electrodes, which is irradiated with a laser to short-circuit and correct defective pixels by melting and bonding with the electrodes, enhancing the accuracy and reliability of the correction process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal piece is formed in the same layer as the common signal line and positioned to overlap with both the common electrode and pixel electrode, then defective pixel correction reliability is improved, but device complexity increases
Solution Approach 1:
The metal piece is pre-formed in the same layer as the common signal line during the manufacturing process, positioned to overlap with both the common electrode and pixel electrode. This preliminary preparation enables subsequent laser irradiation to effectively create a short circuit between the electrodes for defective pixel correction, improving correction reliability without requiring additional manufacturing steps.
Solution Approach 2:
The metal piece serves as an intermediary element that facilitates the short circuit between the common electrode and pixel electrode. When laser irradiation is applied, the metal piece melts and bonds the two electrodes together, acting as a mediator that enables defective pixel correction. This intermediary structure improves correction effectiveness while maintaining a relatively simple overall device architecture.
2Manufacturing precision
If laser irradiation is applied to the metal piece to melt and bond it with the electrodes, then defective pixel correction accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The patent replaces traditional mechanical or chemical bonding methods with laser irradiation to melt and bond the metal piece to the electrodes. This substitution enables precise control over the bonding process, allowing accurate defective pixel correction by selectively irradiating only the defective pixels. The laser method provides superior precision compared to conventional approaches while the process can be automated.
Solution Approach 2:
The laser irradiation process enables precise control of the bonding parameters such as temperature, duration, and energy distribution. By adjusting these parameters, the metal piece can be selectively melted and bonded only to defective pixels, achieving high correction accuracy. The parameter control allows the process to be integrated into existing manufacturing workflows with minimal additional complexity.
3Ease of manufacture
If the metal piece is made of the same metallic material as the common signal line, then manufacturing simplicity is improved, but correction effectiveness may be reduced
Solution Approach 1:
The metal piece is made of the same metallic material as the common signal line, creating a homogeneous structure that simplifies the manufacturing process. This homogeneity allows both components to be formed in the same layer using the same material deposition process, reducing manufacturing complexity. The same material ensures consistent electrical and thermal properties throughout the structure.
Solution Approach 2:
The common signal line material serves multiple functions: it provides electrical connection for the common electrode during normal operation and acts as the bonding material for defective pixel correction when melted by laser irradiation. This multi-functionality eliminates the need for separate materials for the signal line and correction metal piece, simplifying manufacturing while maintaining correction effectiveness through the material's inherent properties.
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 corrects stuck pixels by reducing resistance and power consumption while ensuring high accuracy in defective pixel correction, transforming bright spots into dark spots by creating a short circuit between the common and pixel electrodes.
Implementation Method 1
irradiating the metal piece in a pixel found to have a defect with laser from a surface of the TFT substrate opposite to a surface having the pixel electrode formed thereon
Implementation Method 2
melting and bonding with the electrodes
Implementation Method 3
The metal piece is made of the same metallic material as a metallic material of the common signal line... creating a short circuit between the common and pixel electrodes
Data Source
AI summary
In a TFT substrate, a common signal line is arranged on top of a common electrode and below a pixel electrode through intermediation of an insulating film. The metal piece in a pixel having a bright spot is irradiated with laser from the rear surface side of the TFT substrate. The common electrode and the pixel electrode are short-circuited by the melted metal piece.