1.Appearance inspection For capacitive touch sensors, including capacitive touch screen monitors, first check their appearance. Check that the surface of the screen is flat and smooth, and that there are no scratches, cracks, or visible stains. Because these defects may interfere with touch operation, for example, scratches may cause inaccurate positioning of touch points, affecting the accurate judgment of the touch position of the capacitive touch display. 2.Connectivity detection Line connection check：If it is a stand-alone capacitive touch sensor module or a capacitive touch screen overlay connected to the device, check whether the connection line is intact. For wires connected, check the wires for signs of breakage, breakage, or poor contact. You can use the resistance file of the multimeter to check the continuity of the line to ensure that the signal can be transmitted properly. Interface checks：Check whether the connector of the sensor or capacitive touch screen matches the connector of the motherboard and is securely connected. Loose interfaces may result in loss or instability of the touch signal, so make sure that the pins of the interface are not defor

Basic concepts IPS:IPS stands for In-Plane Switching technology, which is a liquid crystal display technology. It improves viewing angles and color representation by changing the arrangement of liquid crystal molecules. The liquid crystal molecules rotate in a plane parallel to the screen, so that the light can be transmitted more evenly from all angles, and the display effect of a wide viewing angle can be realized. For example, when multiple people are looking at a monitor at the same time or using a tablet, an IPS screen ensures that viewers from all angles can see a clear, color-accurate picture. Capacitive touch screen overlay:A capacitive touch display is a touch screen based on the principle of capacitive sensing. It covers the surface of the screen with a transparent layer of conductive material that changes the capacitance at the touch point when a conductive object, such as a finger, touches the screen. By detecting the location and extent of capacitance change, the device can determine the position and action of the touch. It's like a sensitive electric field sensor, where the touch of a finger triggers a small change in the electric field, which is then recognized by the device. Differences in functional features 1. Display quality aspect

In today's digital age, capacitive touch screen panels have become an indispensable interface for many electronic devices, from smartphones and tablets to smart wearables, which are widely used in daily life. So what exactly works smoothly on a capacitive touchscreen? The human finger – the most natural touch tool The human body itself has a weak bioelectricity, and the finger is the part of contact with the outside world, and when it touches the capacitive touch display, the principle that the capacitive screen is used to locate the touch point by detecting the change of capacitance. The finger skin forms a capacitive coupling with the screen electrodes, and once contacted, the screen electric field changes, and the touch chip quickly calculates the touch position to achieve precise operation. In daily use, tap the icon to quickly open various applications, such as social software, games, etc.; Swipe the screen to browse information, swipe up and down the news list, and switch between desktop pages left and right; Two-finger zoom can easily zoom in or out of pictures and maps, which is convenient and intuitive, meeting the interactive needs of multiple scenes. Capacitive stylus – a great helper for delicate operations This type of stylus is designed for capacitive screens, and the ti

The mainstream status of capacitive touch screen monitors. Currently, most touch screens are capacitive. capacitive touch displays offer a number of advantages, which make them widely used in a wide range of devices. How it works？ Capacitive touch screen overlays work using the body's current sensing. When a finger touches the screen, the finger and the surface of the touch screen form a coupling capacitance due to the presence of an electric field in the human body. For high-frequency current, the capacitor is a direct conductor, so the finger sucks a part of the current from the contact point, this current flows out of the four corner electrodes of the touch screen, and the current flowing through the four electrodes is proportional to the distance from the finger to the four corners, and the controller can get the position of the touch point by accurately calculating the proportion of these four currents. Advantages： High sensitivity:The capacitive touch screen enables very precise touch positioning and responds to slight touch movements. On smartphones, for example, users can easily perform actions such as clicking on small icons and making precise text selections. Multi-touch support:This is an important feature of capacitive touch screens. It allows users to use multiple fingers to operate at the same time, such as two-finger zooming in and out of the map and three-finger switching applications on the phone, which greatly enriches the way users interact with the device. Durability is better:The surface of the

Touchscreen is a broad concept, while capacitive touch screen overlay is a specific type of touch screen. There are mainly the following differences between them. 1.Differences in how it works. Touch screen There are many types of touch screens, and their working principles are different. For example, resistive touch screen, which uses pressure to make the upper and lower layers of the screen contact, thereby changing the resistance value of the circuit to detect the touch position. When an object presses the screen, the two layers of film are turned on at the pressing point, and the controller determines the coordinates of the touch point by detecting the change in current. There is also an infrared touch screen, which is to install infrared transmitting and receiving devices around the screen, when there is an object blocking the infrared, with the help of the operation and processing of the position of the blocked infrared rays, so as to clarify the location of the touch point. Capacitive touch display The working principle of capacitive touch screens is based on the current induction of the human body.Its surface has a transparent conductive material coating, and when the finger touches the screen, due to the presence of the human body's electric field, the finger and the touch screen surface form a coupling capacitance. The screen controller is able to detect the position of the touch point because the capacitance value changes.This kind of touch screen has certain requirements for touching objects, and usually requires conductive objects, such as fingers, to effectively trigger touch operations.

Capacitive touch screen monitors shine on multiple devices such as smartphones, tablets, and smart watches with excellent touch performance, greatly optimizing the human-computer interaction experience. With the continuous progress of science and technology, capacitive touch displays are bound to continue to upgrade and innovate, with more refined resolution, faster response speed, and lower power consumption, bringing more convenience to people to operate electronic devices, integrating into intelligent life in an all-round way, and deeply changing the way people obtain information, entertainment and leisure. Smartphone ‘s screens Smartphones are one of the most common examples of capacitive touch screen panels. For example, Apple's iPhone series and numerous Android phones. It works by taking advantage of the conductivity of the human body. When a finger touches the screen, the finger forms a coupling capacitance with the capacitive sensing layer on the surface of the screen. Inside the screen there is a transparent conductive layer, usually indium tin oxide (ITO), with many tiny capacitive cells distributed. These capacitive cells can cause the capacitance value to change due to the touch of a finger. Touch detection circuits are able to sense this change in capacitance and convert it into an electrical signal. After being processed by the chip inside the mobile phone, the location and strength of the touch are determined, so as to realize various operations, such as tapping the icon to open the app, swiping the screen to turn the page, etc. The screen of the tablet

The operation of a capacitive stylus is based on the basic principles of a capacitive touch screen monitor. The capacitive touch screen overlay is precisely constructed, and its interior is covered with a capacitive sensing layer, which will form a uniform electric field on the surface of the screen when the power is applied. When a conductive medium such as a human finger or a capacitive stylus is close to the screen, the capacitance value of the touch point changes, and the sensors built into the screen quickly capture this subtle change, and then accurately locate the touch position through a complex algorithm, and then realize various touch commands, such as clicking on icons, swiping pages, etc.   Adapt to the various situations of capacitive screens. The standard capacitive screen adapts well. capacitive touch displays produced by most regular manufacturers and produced in accordance with industry specifications have excellent compatibility with capacitive stylus. Tablets and smartphones under well-known brands such as Apple and Samsung have their capacitive screens that have been strictly adjusted, and the stylus can respond accurately and smoothly when approaching, with smooth writing and drawing and coherent lines, which can meet multiple needs such as note-taking, illustration drawing, and accurate clicking. For example, Apple Pencil and iPad series products are sensitive to pressure, and the changes in the weight of pen strokes are faithfully reflected on the screen, making the writing experience close to real paper.

Capacitive touch screen monitors are widely used in many fields of devices due to their excellent touch performance, and the following are some common devices that use capacitive touch screen panels: Consumer electronics： Smartphone 1.As a device that people never leave in their hands, smartphones require precise and sensitive touch interaction. Capacitive touchscreens are a perfect fit for this need, allowing users to make phone calls, send text messages, browse social media, or play games with gestures such as tapping, swiping, and pinch-to-zoom for efficient human-machine interaction. Tablet 2. It is mostly used in scenarios such as reading e-books, watching videos, drawing creation, and mobile office. The capacitive screen gives users a convenient control experience, convenient for accurately clicking icons, handwriting notes, and complex graphic editing, to meet the needs of study, entertainment, and work. Smartwatches 3. The compact body and capacitive touch display allow users to quickly view notifications, switch health monitoring functions, set alarms and other operations in a limited dial space. Transportation Car navigation system 1. The capacitive touch navigation screen equipped with the center console of Hyundai cars allows the driver to intuitively zoom and pan on the map, accurately set the destination, and easily adjust the multimedia system in the car, such as switching music and adjusting the volume, etc., to avoid distraction while driving and operate physical buttons, improving driving safety. Bus and subway self-service inquiry machine

The precise working mechanism of the capacitive touch screen monitor The capacitive touch display is an ingenious masterpiece in the field of modern electronic device interaction, and its operation is based on an extremely sophisticated capacitive sensing system. Beneath the surface of the screen, capacitive sensing elements and a matrix of electrodes are intertwined. Under normal conditions, these components maintain a specific capacitance and electric field distribution, ready to capture subtle changes. When the human finger, the natural conductor, touches the screen, the charge carried by the human body will be injected into the sensing area of the screen, which will instantly break the original capacitance balance and cause the local capacitance value to change. With the built-in sensor keenly monitoring this dynamic change of capacitance, the device can accurately locate the touch point, quickly convert it into the corresponding command signal, and smoothly realize various operations, such as accurately clicking on the icon and smoothly swiping the page, creating a convenient interactive experience for users. The principle of hindrance of the insulating properties of wool gloves The reason why wool gloves make capacitive touch displays "strike" is rooted in the inherent insulating properties of wool materials. Wool fibres are rich in keratin, a substance that

Factors influencing the life of capacitive touch screen monitors The lifespan of a capacitive touch screen is affected by a variety of factors. Usage environment 1. Temperature and humidity: If the capacitive touch display is exposed to high temperature and high humidity for a long time, it may accelerate the aging of the internal electronic components. For example, the performance of capacitive touch displays on outdoor devices in some tropical regions may gradually deteriorate due to the erosion of hot and humid air for a long time. Excessively high temperature may change the material properties of the capacitive sensing layer of the touch screen, while high humidity may cause problems such as circuit short circuits, thereby shortening the life of the capacitive touch screen panel. 2. Dust and pollutants: In environments with a lot of dust or chemical pollutants, capacitive touch screen panels are easily damaged. Dust particles can enter the crevices of the touch screen, wear down the capacitive sensing layer, or interfere with the transmission of touch signals. In environments such as factory floors, if capacitive touch screen devices are not well protected, dust accumulation may cause faults such as ineffective touch on the touch screen, which in turn will affect its service life. Frequency of use and mode of operation

  1.Differences in how it works Conductive touch screen Conductive touch screen mainly uses pressure sensing to work. Its screen structure is generally multi-layered, with tiny gaps between two conductive layers. When an object, such as a finger, presses against the screen, the two conductive layers come into contact under pressure, allowing an electric current to pass through the contact point. The location of the touch is determined by detecting changes in the current. The touchscreen is like a pressure switch, and the contact generated by pressing is the key to triggering the operation. Capacitive touch screen monitor Capacitive touch display is to use the current induction of the human body to work. The surface of the capacitive screen has a layer of transparent conductive material, and when the finger touches the screen, due to the static electricity of the human body itself, the finger and the surface of the screen form a coupling capacitance. Because the change in capacitance causes the circuit under the screen to detect changes in electrical signals, the position of the touch point is determined by calculating the position of these electrical signal changes. It's as if the screen is able to sense the faint changes in the electric field brought about by the human body, and the Capacitive touch screen panel can support multiple touches, which is an important advantage.

Define the difference PWB (Printed Wiring Board) is a printed wiring board, mainly through physical or chemical methods, forming a conductive circuit pattern on the surface of the insulating material, it is a basic circuit board, focusing on the layout and connection of the line, usually does not contain electronic components. It's like a house frame without furniture, just with a built-up of the route. Infrared PCBA (Printed Circuit Board Assembly) is a printed circuit board assembly, which is based on PWB, various electronic components (such as chips, resistors, capacitors, etc.) are assembled to the printed circuit board through soldering, plug-ins, etc. A PCB can be thought of as a house that has been renovated and furnished, and is a complete component that can realize the function of a specific circuit. Differences in feature implementation The PWB itself only provides the physical basis for the circuit connection. For example, on the PWB of a simple LED light circuit, it only has the line to let the current pass through, but it cannot directly realize the function of making the LED emit light. Because the PCB is equipped with components, it can realize the complete circuit function. For the LED lamp example just now, after installing the LED lamp beads, current limiting resistors, and the wires connecting them on the PCBA, the LED can be driven by the power supply to make the LED shine and complete

Circuit composition Ordinary circuits are generally simple circuits formed by basic electronic components (such as resistors, capacitors, inductors, diodes, transistors, etc.) connected by wires, and are mainly used to achieve some basic electrical functions, such as simple power supply, signal transmission, etc. Infrared touch PCBA (Printed Circuit Board Assembly) is a component formed by soldering various electronic components (such as chips, integrated circuits, various plug-in components, etc.) onto a PCB board through surface mount technology (SMT) or plug-in process on the basis of printed circuit board (PCB). It is a more complex integrated structure, which not only contains the connection part of the circuit, but also integrates many functional elements, which can realize complex functions, such as the PCB of the computer motherboard, which can realize various functions such as data processing, storage and communication of various interfaces. Functional complexity The function of ordinary circuits is relatively simple. For example, the function of a simple series resistor divider circuit is simply to divide the input voltage in proportion to the resistor to provide the appropriate voltage for the subsequent components.

Basic concepts of PCBA analysis PCBA stands for Printed Circuit Board Assembly, which means printed circuit board assembly. PCBA analysis is the process of conducting a thorough, in-depth study of this component. In the field of electronic device manufacturing, PCBA is a product form in which electronic components are mounted on a printed circuit board and electrically connected. infrared PCBA analysis aims to ensure the quality, performance and reliability of PCBs by detecting, evaluating and optimizing them in multiple dimensions to ensure the stable operation of the entire electronic system. For example, in the production of smartphones, PCBA is the core component, and its quality directly affects the function and life of the mobile phone. The main content of PCBA analysis 1. PCBA visual inspection This is an important step in PCBA analysis. The inspector will carefully inspect the surface of the PCBA, including the soldering of the components, such as whether there are problems such as false soldering, missing soldering, continuous soldering, etc. It will also pay attention to whether the installation position of the components is accurate, and whether there is any offset, skewed or misalignment. For the PCB board itself, it will check whether the circuit is clear and complete, and whether there are traces of open circuit or short circuit. For example, in the PCBA an

The advantages and disadvantages of infrared and LED in different application scenarios In the field of modern science and technology, infrared and LED technology have a wide range of applications. For the IR touch screen, it shows a unique advantage in some aspects. In the large-size touch screen application scenario, the infrared touch screen overlay can easily achieve a larger touch area, such as on some commercial display screens or large conference tablets, the infrared transmitting and receiving devices of the infrared touch screen can be flexibly arranged to adapt to different size specifications. It will not face technical bottlenecks or high costs when it comes to large size like some LED backlit touch screens.     Infrared touch screen performance features advantages The infrared touch screen has excellent anti-interference ability. In complex light environments, such as strong light exposure or uneven light, the infrared touch screen can accurately detect the touch position through stable infrared transmission and reception, and the LED touch screen may cause inaccurate touch recognition due to light interference. In addition, the touch response speed of the infrared touch screen is fast, when the user's finger touches the surface of the infrared touch screen, its internal infrared sensing

Definition Chip is a kind of integrated circuit, which integrates a large number of microelectronic components (such as transistors, resistors, capacitors, etc.) on a small piece of semiconductor material (usually silicon). It is the core component of electronic products, mainly responsible for processing and storing electronic signals. Perform data operations and instructions execution. Infrared PCBA (Printed Circuit Board Assembly) is a printed circuit board component, which is the product after a series of assembly processes. It includes a printed circuit board (PCB) and a variety of electronic components installed on it, such as chips, resistors, capacitors, inductors, etc., and the electrical connection is realized by means of welding. PCB can be regarded as a small electronic system platform with complete functions, which can realize specific electronic functions. For example, the motherboard of a mobile phone is a typical PCB. Functional focus The functions of the chip mainly focus on the core operations such as data processing, storage and transmission. Consider the chips in smartphones, which process various kinds of data from sensors (like cameras, accelerometers, etc.) and run operating systems and various applications. The function of PCBA is realized based on the

infrared PCBA Storage management When stored, PCB should be placed in a dry, clean and suitable temperature and humidity environment. Avoid exposing PCB to corrosive gases or high humidity to prevent corrosion damage to components pins and lines. Special anti-static packaging materials should be used to pack PCBA to prevent electrostatic damage to its precision components, so as to ensure the stability of PCBA performance. PCBA transport protection In the process of transporting PCBA, buffer protection measures should be done well. The PCBA should be fixed in the appropriate transport tooling or packaging box to avoid loosening of components, falling off or breakage of lines due to shaking and collision during transportation. The transport vehicle or container should be kept stable to prevent violent bumps. For long-distance transportation or severe transportation environment, the use of shock absorbing materials can be increased to minimize the impact of transportation on PCBA and ensure that PCBA can reach the destination safely. PCBA detection and maintenance Regular detection of PCBA is the key to ensure its normal operation. Professional testing equipment, such as multimeter, oscilloscope, etc., are used to test the key component parameters and signal transmission on the PCBA. Check if there are any problems such as virtual welding, short circuit and open circuit. For the PCBA with faults det

Definition of a infrared PCBA fault PCB (printed circuit board component) failure refers to the PCBA in the production, test or use, can not normally achieve electrical functions and mechanical properties, such as circuit failure, signal transmission error, component overheating, short circuit or open circuit and so on. The causes of PCBA failures Design: if the line layout is not reasonable, such as high-speed and low-speed signal line spacing is insufficient, the signal transmission will be abnormal due to electromagnetic interference. Power design error, so that the component power overload, such as resistance excess fixed power heating or even burned, causing fault. Components: the use of poor quality components, large tolerance deviation affects the filtering effect. The welding link is bad, such as virtual welding or false welding, the chip pin connection is unstable, and the signal can not be received and sent normally, resulting in function failure. Environmental factors: high temperature and high humidity accelerate the aging of components and cause the circuit board to be damp short circuit. Strong electromagnetic interference sources affect internal signal transmission, resulting in signal error or loss.

Inspection of appearance Direct visual inspection of the appearance of infrared PCBA, check whether the components are missing or damaged, whether the pins are regular, and whether the solder connection is normal, so as to preliminarily troubleshoot obvious physical defects and some bad welding problems. For example, check whether the patch capacitor is broken, discoloring and other abnormalities, whether the plug-in element is firmly installed and perpendicular to the plate, for surface mounted chips, pay attention to the fit of the pin and the pad, whether there are signs of virtual welding caused by the pin is not completely saturated with solder, and whether there is a short circuit bridge between adjacent pads caused by excessive tin. Electrical connectivity test With the help of professional equipment, the signal is applied to the PCB line to detect the on-off status between the lines, accurately locate the open or short circuit position, and ensure the basic conduction of the electrical line. The test usually uses high-precision resistance measuring instrument, current and voltage detector and other professional tools. First, the specific electrical signal is input at the starting test point of the circuit board, and then the signal feedback of each node is gradually detected along the line. For example, in multi-layer circuit boards, signals need to traverse different inter-layer lines. Through the segmented detection of each layer line, open circuit problems caused by poor lamination process or line etching defects can be effectively found, as well as short circuit risks caused by unreasonable circuit design or welding errors, so as to ensure the integrity and reliability of the entire electrical network.

Through-hole technology Through hole instrumentation technology is a classical method for infrared PCBA fabrication. It starts by drilling holes in the PCBA, where the positions of the holes correspond precisely to the component pin layout. Then, the pins of various types of electronic components are inserted into the corresponding holes. Discrete components such as resistors and capacitors can be inserted manually, while complex components with multiple pins need the help of specific tools. After the insertion is completed, the pin and pad are soldered firmly on the back of the PCBA using a welding device, such as a soldering iron, to form a reliable connection. Finally, through manual inspection or automatic optical inspection (AOI) equipment, the welding quality and installation position of components were comprehensively checked to ensure that the PCBA met the quality requirements. This technology is very advantageous for the installation of some large, heavy and high mechanical stability components on PCBA, and is still widely used in the production of PCBA in industrial control equipment and other fields. Surface mounting technology Surface mount technology has become one of the mainstream methods of modern PCBA fabrication. The process begins with the solder paste printing process, where the solder paste is accurately applied to the pad position on the PCBA surface with the help of a steel mesh. Then, the surface mount components (SMC/SMD) are picked up and placed on the corresponding pads with high speed and accuracy by the mounting machine. The high speed and accuracy of the mounting machine greatly improve the production efficiency. After that, the PCBA with the components mounted is sent to the reflow soldering furnace,

  1.The association of SMT profile with infrared PCBA SMT (Surface-mount Technology), namely Surface Mount Technology, is the most popular technology and process in the electronic assembly industry. It plays a crucial role in the PCB (Printed Circuit Board Assembly) manufacturing process. In simple terms, PCBA is a component that installs various electronic components on a printed circuit board (PCB), and SMT is the key process to realize this installation.    2.The main process of SMT in PCBA Solder paste printer This is the first step in the SMT process and is like building a "foundation" for PCBA. First, the PCB is fixed on the workbench of the printing press. Then, the solder paste (a paste of alloy powder and flux) is printed through a steel mesh (a thin sheet with a specific opening pattern) to the PCB where the components need to be soldered. This process requires precise control of the amount of solder paste and the printing position, much as a painter applies paint to a canvas with precision. If the amount of solder paste is too large, there may be problems such as short circuit in the subsequent welding process; Too little solder paste may lead to weak soldering. Component mount After the solder paste printing is completed, it enters the exciting component mounting phase, which is the stage where the PCBA begins to "add bricks and mortar". The Mount machine, which is like a super flexible "elf", can take out various Surface mount components (SMD) from the material belt or material plate with high speed and accuracy, and accurately mount to the solder paste printed

Definition Infrared PCBA (Printed Circuit Board Assembly) thermal shock test is a reliability test. It is mainly used to evaluate the tolerance of PCB in the environment of rapid temperature change. Test purpose Check solder joint reliability: In the manufacturing process of PCB, solder joints connect various electronic components and printed circuit boards. Thermal shock can cause the solder joint to undergo expansion and contraction processes. Through the thermal shock test, it is possible to see whether the solder joint will crack, loosen and other problems under such a sharp change in temperature. For example, in the PCBA of some consumer electronic products, such as the mobile phone motherboard, if the quality of the solder joint is not acceptable, the circuit may be broken after thermal shock, resulting in the failure of some functions of the mobile phone. Evaluate component performance changes: The performance of electronic components may be affected when the temperature changes. For example, the capacitance value of a capacitor may change with a sharp change in temperature. Thermal shock testing can help determine whether these components can function properly under extreme temperature change environments and whether the performance variation is within allowable limits. Check material compatibility: PCBA is composed of a variety of materials, including circuit board materials, electronic component packaging materials, etc. Different materials have different thermal expansion coefficients, and rapid temperature changes may lead to problems in the interaction between materials, such as delerination and rupture. Thermal shock testing can check the compatibility bet

Definition PCB tester is specialized for printed circuit board components (Infrared Infrared PCBA) for testing professional equipment. It is like a rigorous quality inspector, before the PCBA enters the next production link or the final product, a comprehensive "physical examination". Its purpose is to accurately determine whether the performance indicators of PCBA fit the established design standards, so as to ensure the quality of electronic products. Main types of tests Circuit Connectivity Test: This test focuses on the conduction condition of the line on the PCBA. By inputting a small current signal into a specific circuit node, and then detecting the signal reception of other nodes, it can determine whether the circuit is open or short. For example, in the multi-layer circuit board, it can accurately find out the circuit blockage caused by the production process problem of the inner circuit. Component parameter test: For PCBA on the dazzling array of electronic components, such as resistance, capacitance, inductance, etc., the tester can accurately measure its parameter values. For example, the capacitance of capacitors, the resistance of resistors, and the inductance of inductors, etc., ensure that the actual parameters of these components are within the tolerances allowed by the design. Once a component parameter deviation is too large, it may cause abnormal performance of the whole circuit, such as frequency drift, signal attenuation and other problems.

Optical touch screen working basis The core of optical touch screen lies in the IR touch frame. The IR touch overlay is composed of a series of infrared emitting tubes and infrared receiving tubes. At the beginning of its work, infrared emitting tubes emit infrared rays, which create a thin and orderly network of light in front of the screen, like an invisible spider web of light, evenly covering the surface area of the screen. Principle of touch sensing When there is a touch action, such as a finger or a stylus touching the screen, it will block part of the propagation path of infrared light. The infrared receiving tube in the infrared touch box monitors the reception of infrared rays at all times. Once the infrared rays are blocked, the intensity of the light received by the corresponding receiving tube will be weakened. Through the accurate analysis of the signal changes of each receiver, the infrared touch box can quickly determine which beam or several beams of infrared light are blocked, and then calculate the specific coordinate position of the touch point on the screen according to the pre-set light matrix layout. Due to the large number and close arrangement of the transmitter and receiver tubes in the IR touch overlay, it can achieve more accurate touch positioning, whether the touch operation is at the edge of the screen or the center area, it can be accurately captured.