A resistive touch screen is a sensor that converts the physical position of the touch point (X, Y) in a rectangular area into a voltage representing the X and Y coordinates. Many LCD modules adopt resistive touch screens, which can generate screen bias voltage with four, five, seven or eight wires and it can read back the voltage of the touch point.
Capacitive touch screen technology is achieves this by using the capacitance of human skin to detect the proximity or position of the input. Capacitive touch screen is a four-layer composite glass screen. The inner surface and mezzanine of the glass screen are painted with ITO. The outer layer is a thin silica glass protective layer. The ITO mezzanine acts as the working layer. Four electrodes are drawn from four corners, and the inner ITO is the shielding layer to ensure a good working environment. When the finger touches the metal layer, due to the electric field of the human body, the user and the surface of the touch screen form a coupling capacitance. For high frequency current, the capacitance is a direct conductor, so the finger sucks a small current from the contact point. The current flows from the electrodes on the four corners of the touch screen, and the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller calculates the proportion of the four currents accurately to get the position of the touch point.
Infrared technology touch screen consists of infrared transmitting and receiving sensors mounted on the outer frame of the touch screen. On the surface of the screen, an infrared detection network is formed. Any touching object can change the infrared line at the contact point to realize the touch screen operation. The principle of infrared touch screen is similar to that of surface acoustic wave touch screen. It uses infrared emitting and receiving sensing elements. These elements form an infrared detection network on the surface of the screen, and the touch-operated objects (such as fingers) can change the infrared radiation of the contacts, which can be converted into the coordinate position of the touch-operated to achieve the response of the operation. On the infrared touch screen, the circuit board devices arranged on the four sides of the screen have infrared emitters and infrared receivers, which correspond to the formation of the infrared matrix crossing vertically and horizontally.
High Definition Multimedia Interface (HDMI) is a fully digital video and audio transmission interface, which can send uncompressed audio and video signals. HDMI can be used in set-top boxes, DVD players, personal computers, TV amusement instruments, integrated amplifiers, digital audio and TV sets and other equipment. HDMI can send audio and video signals simultaneously. Because the audio and video signals use the same wire, it greatly simplifies the installation difficulty of the system line.
4K display is a display device with 4K resolution. The name 4K derives from its transverse resolution of about 4000 pixels. There are two super high resolutions: 3840 x 2160 and 4096 x 2160 pixels. Compared with the mainstream 1080P full-HD resolution, the 4K display adds millions of pixels, and the image fineness and display quality are improved a lot.
IP (INGRESS PROTECTION) protection grade system is drafted by IEC (INTERNATIONAL ELECTROTECHNICAL COMMISSION), which classifies electrical appliances according to their characteristics of dust and moisture prevention. The IP protection level is composed of two numbers. The first number represents the level of dust-proof and intrusion-proof of electrical appliances (the objects referred to here contain tools, human fingers, etc. which can not touch the inner part of electrical appliances in order to avoid electric shock). The second number represents the degree of sealing of moisture-proof and waterproof immersion of electrical appliances. The larger the number is, the higher the level of protection.
Touch Think manufactures IP65 rated dust-proof and water proof industrial monitor, industrial panel PC, industrial Android tablet and mini PC. They performs reliable and perfect in harsh environments under all-weather conditions.