As an input device, the touch screen has the advantages of easy to use, ruggedness, fast response time, and space saving, and the user can use it directly through the contact screen to complete the operation, without the need for a keyboard or mouse, and is very practical and widely used.
The quality requirements of the touch screen are verified by testing, and the reliability test must be carried out in production, and the primary test items include high and low temperature preservation, cold and hot shock preservation, dotting test, marking test, surface hardness, surface static pressure test, packaging sensation, packaging fall, steel ball impact test, etc. In the contact screen test, there is a large demand for current transmission, and the high-current shrapnel microneedle module can be used for connection and conduction, first, it can transmit up to 50A of current and maintain a stable connection; Second, it will not cause puncture marks to the connector, and has a service life of more than 20w times; Third, it can cope with the messy test environment, and can effectively improve the efficiency of the test without needle and non-pinning.
The primary elements of a touch screen are a sensor unit that processes the user's choice, a controller that senses and localizes the contact, and a software driver that transmits the contact signal to the operating system. These three types of components constitute the operating mechanism of the contact screen. In addition to the components, there are also several skill types such as capacitive contact screen, resistive contact screen, infrared contact screen, surface acoustic wave contact screen and near-field imaging contact screen.
The capacitive touch screen is coated with a transparent conductive layer ITO, the voltage is connected to the four corners, and the small DC dispersion part is on the surface of the screen to form a uniform electric field. Because it only needs to sense the current of the human body to make a corresponding response.
The resistive touch screen is composed of a display screen and a resistive thin film screen, and the resistive thin film screen is divided into two layers, one is based on glass, and the surface is coated with a bright conductive layer; Outside the base layer is the same plastic layer with a conductive layer. Whenever the screen is pressed or touched, the conductive layers will touch each other and form a contact signal to complete the operation.
The infrared touch screen is based on the abort skill of light, and an outer frame is set around the display, with a light source or LED on one side of the outer frame, and a light detector or photoelectric sensor on the other side, and the two ends correspond to form an interspersed infrared network. Whenever an object touches the display, the infrared rays are blocked, so that the position of the contact point on the screen can be determined.
A sonic touch screen is a sensor mounted on the edge of a glass screen to send ultrasonic signals. Ultrasonic waves are reflected through the screen and are subjected to by the sensor. The external sound wave signal is to convert the surface sound wave energy formed by the convergence of reflected fringes into an electrical signal; The Guided Sonic skill converts the electrical signal sent by the controller through the screen cable into sonic energy
The near-field imaging touch screen is composed of two thin glass layers, and when an AC signal is applied to the conductive layer, an electric field will occur on the surface of the screen, and when the sensor is touched with a finger or a conductive pen, the electric field will be disturbed, and the screen can get the signal.
Among these types of touch screen skills, the resistive contact screen can only distinguish one control point during operation, and it is impossible to make correct judgment beyond one, which is not applicable to multi-functional mobile phones and tablets, and is only suitable for the discrimination of simple actions such as clicking and dragging. The technical limitations of the IR contact screen due to its low resolution, limited touch methods, susceptibility to environmental interference and sensitivity to lighting environmental factors make the IR contact screen less popular in the market. Once the surface of the screen is contaminated with dust, oil or liquid, the waveguide groove on the surface of the contact screen will be blocked, so that the waves cannot be emitted and identified normally, and then the contact screen cannot be used normally.
The capacitive touch screen has high durability, dustproof, waterproof, wear-resistant characteristics, and its multi-touch function can decompose the user's contact actions and complete the judgment of messy actions, so it is very ideal for mobile phones, tablets of contact screens.
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Although the basic structure and operating principle of the projection capacitive contact screen is the same as that of the four-wire impedance film, the projection capacitive impedance film does not pass through the contact field, but captures the change of capacitance between the electrodes. Generally speaking, when using the form of capacitive sensor, it can almost ...
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Categories and Advantages and Disadvantages of Resistive Touch - Hitech
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