COB Module

he COB (Chip On Board, COB) process is first to cover the silicon wafer placement point with a thermally conductive epoxy resin (generally silver-doped epoxy resin) on the surface of the substrate, and then place the silicon wafer directly on the surface of the substrate. Heat treatment until the silicon wafer is firmly fixed on the substrate, and then wire bonding is used to directly establish an electrical connection between the silicon wafer and the substrate.


COG is the abbreviation of chip on glass, that is, the chip is directly bound to the glass. This installation method can greatly reduce the size of LCD modules and is easy to mass produce. It is suitable for LCDs in consumer electronic products, such as mobile phones, PAD and other portable products. This installation method is promoted by IC manufacturers. Will be the main connection method between IC and LCD in the future.


OLED (Organic Light-Emitting Diode), also known as organic electric laser display, organic light emitting semiconductor (Organic Electroluminesence Display, OLED). OLED is a kind of current-type organic light-emitting device, which is a phenomenon of luminescence through the injection and recombination of carriers, and the luminous intensity is proportional to the injected current. Under the action of an electric field, the holes produced by the anode and the electrons produced by the cathode will move in the OLED, and are injected into the hole transport layer and the electron transport layer respectively, and then migrate to the light emitting layer. When the two meet in the light-emitting layer, energy excitons are generated, thereby exciting the light-emitting molecules and finally generating visible light.


TFT (Thin Film Transistor) is an abbreviation for thin film transistor. TFT display is the mainstream display device on various notebook computers and desktop computers. Each liquid crystal pixel on this type of display is driven by a thin film transistor integrated behind the pixel, so TFT display is also a type Active matrix liquid crystal display device. It is one of the best LCD color displays. The TFT display has the advantages of high response, high brightness, high contrast, etc., and its display effect is close to the CRT display.