1. Integrated touch module
Integrated touch module, that is, through the display and touch screen bonding, binding module drive components, assembly backlight and other production processes of products, to achieve the integration of touch and display.The touch screen is on the top and the display is on the bottom.Compared with touch screen products, integrated touch module products are closer to the downstream of the industrial chain of touch electronic products.The lamination technology of integrated touch module includes full lamination technology and common frame lamination technology.
Integrated touch control module is mainly used in mobile phones, tablet computers, smart wearable products, industrial control, medical devices, smart home devices, vehicle products and other terminals.
(1) full-fit technology
Full-fit technology is a bonding technology that USES solid or liquid optical adhesive to completely fit the touch screen and the display screen in a seamless way.Full lamination technology can avoid air layer between screen lamination.As manufacturers of mobile terminals have higher and higher requirements on the appearance and display effect of module products, thinner requirements on device thickness, and more stringent requirements on various indicators of accessories, full-fit technology is one of the mainstream technologies for the development of integrated touch module.
(2) ordinary frame paste technology
Common frame sticking technology is an early sticking technology, which USES double-sided adhesive tape to fix the touch screen and the four sides of the display screen.Its advantage is simple processing, low cost.However, because there is an air layer between the touch screen and the display screen, the display effect after the light is refracted is reduced, and the light transmission loss is much and the brightness is low, which are the major defects of frame paste technology.At present, the number of products using frame sticker technology is decreasing year by year.
2. Touch screen
Touch screen, also known as "touch screen" and "touch panel", is an external input device for electronic products.Using touch control technology, users can operate the product by gently touching the corresponding position on the screen of the device, thus making human-computer interaction more simple, intuitive and convenient.In electronics devices, the touch screen is actually a substitute for input devices like traditional keyboards and mice, giving electronics developers more room to play with their functions and interfaces.Touch screen technology is mainly divided into capacitive and resistive.
Touch screen is mainly used in mobile phones, tablet computers, smart wearable products, industrial control, medical devices, smart home devices, vehicle products and other terminals.
(1) capacitive touch screen
Capacitive touch screen (referred to as "capacitive screen") USES the human body's current induction principle and relies on the capacitance formed by the human body and the electrode when touching the screen to realize the contact location.At present, the capacitor screen produced by the company adopts advanced technology and design. Compared with the resistive screen, it has the advantages of high sensitivity, excellent light transmission, stronger durability, and supports multi-touch control, which is more in line with the development trend of market demand.Based on the above advantages, most of the current smart phones, tablets and other electronic products use capacitive screen.According to the different materials used, the capacitance screen can be divided into film structure capacitance screen and glass structure capacitance screen.Among them, the thin-film capacitor screen can be further divided into GF, GFF, G1F and GF2, and the glass structure can be further divided into GG and OGS.The company has the ability to produce both thin film structure and glass structure capacitor screen.
(2) resistive touch screen
The main principle of resistive touch screen (referred to as "resistive screen") is to change the contact resistance of the touch screen through pressure, so as to obtain different voltage values and positioning coordinates, and realize the operation and control of the screen content.Resistive screens generally use a combination of film and glass structure, film and glass contact surface are coated with ITO film layer, ITO has a good conductivity and transparency.When the touch operation, the ITO in the lower layer of the film will contact with the ITO in the upper layer of the glass, forming a closed circuit. The corresponding electrical signal will be sent to the processor through the sensor, and the corresponding position will be calculated through the conversion circuit, so as to complete the action of point selection.The advantage of resistive screen is not afraid of dust, water and dirt, can work in bad environment, simple and mature technology, cheap raw materials, and therefore low price.The disadvantage of resistive screen is poor sensitivity, and the outer film is easy to damage, local damage will lead to the failure of the touch screen.Since there must be an air layer between the ITO of the inner and outer layers of the resistive touch screen, it will also affect the light transmittance of the display and cause the screen brightness to decrease.
Resistive touch screens are gradually fading out of the portable mobile electronic equipment market due to the general inability of multi-touch touch screens and the lack of good user experience. In recent years, resistive touch screens are mainly used in industrial control and traditional vehicle central control system and other fields.
3. Fingerprint identification module
Fingerprint identification module refers to the device that integrates the chip, soft circuit board, cover plate, metal parts and other components through specific technologies, and USES the principle that sensor electrodes sense different capacitance changes to fingerprint valley and ridge features, and reconstructs the fingerprint image to realize fingerprint input and fingerprint identification.The fingerprint recognition function can be equipped with intelligent mobile terminal products for unlocking, personal privacy protection, mobile payment and other activities.According to the different production process, the production of fingerprint identification module is mainly divided into cover plate scheme technology, spraying scheme technology and hidden scheme technology in development.
Fingerprint identification module is mainly used in mobile phones, tablets, laptops, car products, intelligent security equipment, public security equipment and other terminals.
(1) fingerprint identification module of cover plate scheme
The fingerprint identification module of cover plate scheme is made by bonding the PCB module which has been pasted on the chip and the protective cover plate with optical glue.Cover plate scheme product variety, can be customized sapphire, glass, ceramic and other cover plates, scratch-resistant ability, beautiful appearance, good user experience, most of the middle and high-end smart phones adopted, and become the mainstream development trend of fingerprint identification module.
(2) fingerprint identification module of spraying scheme
The fingerprint identification module of the spraying scheme is made by attaching the chip on the circuit board through surface mount technology and spraying protective ink on the chip surface.The spraying process has low cost and is adopted by most middle and low-end models.