NO.1 What is TFT-LCD?
TFT: Thin Film Transistor
LCD: Liquid Crystal Display
The basic structure of the TFT-LCD panel is that a layer of liquid crystal is sandwiched between two glass substrates. Color filters are attached to the front LCD panel, and thin film transistors (TFTs) are fabricated on the rear TFT panel. Because TFT-LCD has the advantages of small size, light weight, low radiation, low power consumption, and full color, it has been widely used in various display devices.
NO.2 TFT-LCD process technology
The TFT-LCD manufacturing process is divided into three stages:
Array process: the manufacture of circuit boards on glass substrates. To form a usable TFT, the cleaning needs to be repeated 5-7 times.
Cell process: Combining the transistor glass substrate with the color filter, the entire manufacturing process of the TFT-LED must be carried out in a clean room.
Module process: After the polarizer is attached, both sides of the LCD panel are equipped with DRIVE ICs (driving components) to control the color and brightness of the LCD.
NO.3 Important role - ESD (Electrostatic Discharge)
In large-scale semiconductor manufacturing, electrostatic discharge (ESD) has always played an important role, especially for TFT-LCD manufacturing and IC manufacturing, the impact of ESD must be considered during design, manufacturing, testing, and shipping. In the 1980s, Japan analyzed scrapped electronic products, and the loss caused by ESD accounted for about 1/3, resulting in a decline in yield and affecting revenue.
In the TFT-LCD process, a large current of about 20A can be generated at the moment of friction and contact, and the glass substrate is a non-conductor, which is not conducive to electrostatic discharge. The active layer is amorphous silicon, which is a weak n-type semiconductor, and electrostatic accumulation (ESC) ) and the electrostatic discharge (ESD) process is more likely to cause the insulation layer to break down, form a short circuit or cause partial damage, resulting in an increase in the leakage current of the components, forming defects, and affecting the yield.
NO.4 How to remove "important roles"?
How does the Array process remove static electricity?
How does the Cell process remove static electricity?
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How does the Module process remove static electricity?
By applying a high voltage (3kV or more) to the electrode needle, corona discharge is performed at the tip portion of the electrode needle. The electronic properties of the air existing around the electrode needle are decomposed to generate ions, and static electricity can be eliminated by conducting the ions to charged objects.
Easily solve static caused by:
