The touch screen is a touch panel, which is generally matched with a liquid crystal display device as a touch display device. An industrial tablet PC is an industrial computer with a touch display device. Commonly used touch screens include resistive screens, capacitive screens, infrared screens, and external acoustic wave screens.
1. Resistive screen
The screen body of the resistive screen is a multi-layer composite film, which is composed of a layer of glass or plexiglass as the base layer, coated with a transparent conductive layer (ITO film) on the surface, and covered with a layer of smooth and scratch-resistant plastic layer with a hardened appearance. The inside and outside of it are also coated with a layer of ITO, and there are many small transparent barrier points between the two conductive layers to separate them. When touching the screen, the two-layer ITO generates a touch, the resistance changes, and the controller calculates the coordinates of the touch point according to the detected resistance change, and then operates accordingly according to this coordinate. Therefore, the industrial tablet computer that uses the resistive screen must apply force to the screen when operating in order to obtain the touch effect.
The resistive screen has low requirements for the working environment, is not afraid of dust, water vapor and oil, can be touched with any object, and does not have great requirements for temperature and humidity, which is suitable for industrial control. In addition, the resistive screen is a soft screen, and the industrial tablet computer that uses the resistive screen will feel soft when operating the screen, and too much force or using a sharp touch may cause scratches on the touch screen.
Four-wire resistive touch screen: not afraid of dust, oil and photoelectric disturbance, afraid of scratches is its primary shortcoming. It is suitable for public places with fixed users, such as industrial control sites, self-service terminals, etc.
Five-wire resistive touch screen: excellent activity and light transmittance, long service life, not afraid of dust, oil and photoelectric disturbance, suitable for all kinds of public places, especially suitable for industrial control sites that require precision.
2. Capacitive screen
The capacitive screen is a four-layer composite glass screen, the inner and outer surface of the glass screen and the interlayer are each coated with a layer of ITO, the outermost layer is a thin layer of silica glass protective layer, the interlayer ITO coating is used as the working surface, four electrodes are drawn out at the four corners, and the inner ITO is the shielding layer to ensure an outstanding working environment. When touching the screen of the industrial tablet PC with your hand, the human body acts as one pole of the coupling capacitor, and the current gathers from the four corners of the screen to form the other pole of the coupling capacitor, and the relative interval between the current and the contact direction is calculated by the controller to obtain the coordinates of the touch.
The industrial tablet computer using the capacitive screen can be multi-touch, but the first disadvantage is that when the ambient temperature, humidity, electric field, etc. are changed, it may cause the drift of the capacitive screen, resulting in inaccuracy, and it needs to be calibrated and positioned frequently. Therefore, the capacitive screen is not easy to be used in industrial control places and disturbing places.
3. Infrared screen
The infrared screen uses an infrared matrix in the X and Y directions to detect and locate the user's touch. The infrared screen is equipped with a circuit board frame in front of the display, and the circuit board arranges infrared emitting tubes and infrared receiving tubes on the four sides of the screen, which correspond to form an infrared matrix interspersed horizontally and vertically. When touching the screen of an industrial tablet PC, the touch object will block the horizontal and vertical infrared rays passing through the direction, so that the position of the touch point on the screen can be determined. Any touching object can be modified by the infrared light on the contact to complete the touch screen operation.
The infrared screen is not disturbed by current, voltage and static electricity, is not afraid of pollution, is not easy to damage, and is easy to protect. It is suitable for chaotic working environments, and can be used in all kinds of public places, offices and industrial control sites where the requirements are not very precise without infrared rays and strong light disturbance. In addition, since the infrared screen relies on infrared sensing to operate, changes in external light, such as sunlight or indoor lights, will affect its accuracy, and industrial tablet PCs using infrared screens need to consider the high stability function and high resolution of the touch screen.
4. Appearance sound wave screen
The appearance of the sound wave screen is composed of a touch screen, a sound wave generator, a reflector and a sound wave receiver, during which the sound wave generator can send a high-frequency sound wave across the screen surface, when touching the screen, the sound wave on the contact point is blocked, so as to determine the coordinate orientation, fast response, high precision. The appearance of the sound wave screen also has a third axis, that is, the pressure axis, after calculating the attenuation of the received signal attenuation at the attenuation of the amount of force can obtain the user's touch screen strength, with the function of sensing the touch pressure.
The appearance of the sound wave screen has high resolution and good light transmittance. The reaction is active, the application cycle is long, and it is not affected by environmental factors such as temperature and humidity. There is no drift, only one proofreading is required when the device is installed. The industrial panel PC with an external sound wave screen is suitable for all kinds of public places with unknown users. At the same time, the exterior sound wave screen needs to be constantly protected from dust, oil and even beverage liquids
Staining the surface of the screen will block the waveguide groove on the surface of the touch screen, so that the wave can not be emitted normally, or the waveform will be changed and the controller can not be recognized normally, and then affect the normal use of the industrial tablet computer, and the user needs to clean it regularly.
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