What is the production process of the LCD screen:
1, array manufacturing process
1) A piece of glass with a smooth surface and no impurities is the most important raw material for making TFT glass substrates. Before production, it is necessary to wash the glass with a special detergent, then dehydrate and spin dry.
2) To coat the glass substrate with a metal film, the metal material needs to be placed in the vacuum chamber, and after the special gas on the metal generates plasma, the atoms on the metal will be knocked against the glass, and then a layer of layers will be formed. Metal film too.
3) After the metal film is plated, we also need to plate a non-conductive layer and a semi-conductive layer. In the vacuum chamber, the glass plate is heated first, and then a special gas is sprayed by a high-voltage sprayer to let the electrons and the gas Plasma is generated, and after a chemical reaction, a non-conductive layer and a semiconductor layer are formed on the glass.
LCD
4) After the film is formed, we need to make a pattern of transistors on the glass. First, enter the yellow light room and spray a photoresist with a very strong photosensitive, then put on the photomask to irradiate blue-violet light for exposure, and finally send the developer to the developing area to spray the developer, which can remove the photoresist after the light and let the light The resist layer is shaped.
5) After the photoresist is shaped, we can perform wet etching with etching to expose the useless film, or dry etching with the chemical reaction of plasma. After etching, the remaining photoresist is removed with liquid, and finally Generate the circuit pattern needed for the transistor.
6) To form a usable thin-film transistor, it is necessary to repeat the process of cleaning, coating, photoresist, exposure, development, etching, and photoresist removal. Generally speaking, to manufacture TFT-LCD, it is necessary to repeat 5 to 7 times.
2, assembly process
1) After finishing the thin film transistor glass substrate, we will proceed to the combination of the liquid crystal panel. The liquid crystal panel is composed of the transistor glass substrate and the color filter. First, we must clean the glass before proceeding. One step. The entire manufacturing process of TFT-LCD must be in a clean room, so that there will be no impurities in the display.
2) The color filter is a chemical coating method to form red, green, and blue colors on the glass, and then it is completed by covering it with a conductive film.
3) In the entire assembly process, first we have to coat a layer of chemical film on the glass and color filter covered with transistors, and then perform the alignment action.
4) Before combining the two glass plates, we must first evenly cover the spherical-like gaps at a fixed interval to prevent the two glass plates from being curved inward after the liquid crystal panel is combined. Usually, when the liquid crystal panel is assembled, one or two gaps are left to facilitate the subsequent filling of the liquid crystal, and then the edge of the two pieces of glass is sealed with sealant and conductive glue, thus completing the glass assembly.
5) After sealing the frame, put the LCD panel in the vacuum chamber, and drain the air from the LCD panel through the gap just reserved, and then pour the liquid crystal with the help of atmospheric pressure, and then close the gap. Liquid crystal is a kind of The compound substance between solid and liquid has the characteristic of regular molecular arrangement.
6) Finally, attach two vertical polarizers, and the entire LCD panel is completed.
3, module manufacturing process
1) After the polarizer is attached, we start to mount DRIVE IC on both sides of the LCD panel. DRIVE IC is a very important drive component, which is used to control the color and brightness of the LCD.
2) Then connect the input end of the DRIVE IC to the circuit board by soldering. In this way, the signal can be sent out smoothly, and then the image on the control panel is ready.
3) The light of the LCD panel is emitted from the backlight. Before assembling the backlight, we will first check whether the assembled LCD panel is perfect, and then assemble the backlight. The backlight is the source of light behind the LCD panel.
4) Finally, lock the CELL and the iron frame with screws.
5) When we come back, we will enter the final critical test process. The assembled modules are subjected to aging test, and products with poor quality are screened out in the state of electrification and high temperature.
6) The best quality products can be packaged and shipped.
In this way, the LCD panel has undergone many inspection and testing procedures to deliver the most perfect product to the customer, and this is the real completion of the entire LCD production process.
