LCM (LCD Module) is an LCD display module and a liquid crystal module. It refers to a component that assembles a liquid crystal display device, a connector, a peripheral circuit for controlling and driving, a PCB circuit board, a backlight, and a structural member. It provides users with a standard LCD display driver interface (different types such as 4-bit, 8-bit, VGA, etc.), and the user operates according to the interface requirements to control the LCD to display correctly. Compared with glass, LCM is a more integrated LCD product. For small-size LCD display, LCM can be easily connected to various microcontrollers (such as single-chip microcomputer); however, for large-size or color LCD display, generally Will occupy a considerable part of the control system resources or simply can not achieve control, such as 320 & TImes; 240 256 color color LCM, display 20 seconds / second (that is, 1 second full screen refresh display), only one second of data transmission The amount is as high as: 320&TImes;240&TImes;8&TImes;20=11.71875Mb or 1.465MB. If the standard MCS51 series MCU is processed, it is assumed that the MOVX instruction is used to continuously transmit the data. Considering the address calculation time, at least 421.875MHz clock is needed to complete the data transmission. It can be seen that the amount of processed data is huge. The resolution of the fax is also the scanning density. The higher the resolution, the higher the accuracy of the scanning. It can be divided into vertical resolution and horizontal resolution. Vertical resolution refers to the number of pixels displayed per millimeter on a vertical horizontal line, and horizontal resolution refers to the number of pixels displayed per millimeter on a parallel horizontal line. According to the international standard of the three types of fax machines, the horizontal resolution is 8 pixels / mm, so the resolution of the fax machine is generally expressed as 8 pixels / mm × vertical pixels / mm, generally we will save the horizontal resolution, only vertical Resolution to represent the resolution. The vertical resolution mainly has three standards: 3.85 pixels/mm, fine 7.7 pixels/mm, and ultra-fine 15.4 pixels/mm. LCM process (Liquid Composite Molding) refers to composite liquid forming technology represented by RTM, RFI and RRIM. The main principle is to first lay a reinforcing material preform designed in the cavity according to performance and structural requirements, and use a injection device to inject a special resin such as a closed cavity or a resin film in a heated cavity. The mold has peripheral sealing and fastening as well as an injection and exhaust system to ensure smooth flow of the resin and to exhaust all of the gas in the mold cavity and thoroughly wet the fibers, and the mold has a heating system that can be heat cured to form the composite member. LCM (Liquid Crystal Module), which is a liquid crystal module. The upper substrate assembly, the lower substrate assembly, the liquid crystal, the driving circuit unit, the backlight module and other accessories, wherein: the lower substrate assembly mainly comprises a lower glass substrate and a TFT array, and the upper substrate assembly comprises an upper glass substrate, a polarizing plate and The film structure is applied to the upper glass substrate, and the liquid crystal is filled in the gap formed by the upper and lower substrates. The process consists of four sub-processes: LCM process, color filter process, cell process and module process. COG: Chip On Glass That is: the wafer is bonded to the glass COB: Chip On Board That is: the wafer is bonded on the PCB TAB: Tape Automatic Bonding That is, the anisotropic conductive adhesive is connected to the LCD and the PCB with the anisotropic conductive adhesive of the TCP (Tape Carrier Package). COF: Chip On Film That is, the wafer is mounted directly on the flexible film (peripheral components can be mounted on the flexible film together with the IC) Other categories: such as digital display module, dot matrix character module, dot matrix graphic module according to the display content, according to the temperature classification, there are normal temperature and wide temperature type. Positive image display (+V) Negative image display (-V) Transmissive Reflective display (Reflective) Semi-transmissive display (Transflective) TN type: 90° twist, low operating voltage, small viewing angle, and drive duty ratio of 1/4 to 1/8. Displayed in black/white display. Both cost and price are low. HTN type: 110° twist STN type: 180° to 250° twist, the working voltage is slightly higher, the viewing angle is significantly larger than the TN type, and the driving duty ratio is 1/4 to 1/8 or more. Displayed in yellow/blue or black/white display. Cost and selling price are higher than TN type. FSTN type: STN+ single layer compensation film FFSTN type: STN+ double layer compensation film DSTN type: double layer STN box ASTN, ISTN, etc. LCD panel (including surface polarizer and bottom polarizer) IC (integrated circuit): drive and control LCD display ACF (anisotropic conductive film): connect IC to LCD || FPC to LCD FPC (flexible circuit board): connection and conduction IC Bonding principle: Directly connecting the terminals of the integrated circuit wafer to the ITO leads of the LCD through conductive particles of an anisotropic conductive film (ACF) BZF (iron frame) LCD panel (including surface polarizer and bottom polarizer) ZBC (conductive adhesive) B/L (backlight) PCB board IC (integrated circuit) IC Bonding principle The metal aluminum wire is soldered to the IC and PCB board by a wire bonding machine to provide a conduction function. LCD panel (including surface polarizer and bottom polarizer) TCP (Tape Carrier Package) ACF (anisotropic conductive film): Connect TCP IC to LCD LCD panel (including surface polarizer and bottom polarizer) COF IC (Integrated Circuit) ACF (anisotropic conductive film): Connect COF IC to LCD Screen Protector,Uv Glue Screen Protector,Uv Tpu Film Screen Protector,Uv Curing Screen Protector Shenzhen TUOLI Electronic Technology Co., Ltd. , https://www.hydrogelprotectors.com
Introduction to LCD display module