At present, the touch panel has begun to become an industry in the world. As an advanced computer input device, it is currently the simplest, convenient, natural and suitable for multimedia information query equipment. The touch panel has many advantages such as ruggedness, fast response, space saving, and easy communication. However, in response to the popularization of VCD / DVD multimedia and satellite navigation GPS in vehicles, the application of touch display panels in automobiles is becoming more and more common, allowing drivers or passengers to use this technology, as long as they touch gently with their fingers The icon or text on the display panel can realize the operation of the host, so that people, cars, and machines can interactively input and output the system. This technology greatly facilitates users who do not understand computer operation, and also gives the vehicle multimedia equipment. The new look is a very attractive new multimedia interactive product.
For the convenience of operation, people use touch panels instead of mouse or keyboard. When working, we must first touch the touch panel installed on the front of the display with our fingers or other objects, and then locate the selection information input according to the icon or menu position touched by the finger. Its main structure is composed of touch detection components and touch panel controller .
The touch detection component is installed in front of the display panel and is used to detect the user's touch position and send back the touch screen controller; the main function of the touch screen controller is to receive touch information from the touch point detection device and convert it into contact coordinates for transmission To the CPU, it can also receive commands from the CPU and execute them.
In the current market touch panel, it can be divided into five basic types; from the technical principles to distinguish the touch panel, it can be divided into: pressure sensing technology touch panel, resistance technology touch panel, capacitance technology touch panel, infrared technology touch panel , Surface acoustic wave technology touch panel.
Among them, pressure sensing technology has withdrawn from the market; although the price of infrared technology is low, the outer frame is easily damaged and generates light interference, which is easy to distort when curved; the capacitive design theory is good, but the situation of image distortion is difficult to be fundamentally resolved; resistive The positioning is accurate, but the price is high, and the panel is also easy to damage; the surface acoustic wave touch screen solves the various defects of the previous touch screen, the picture is clearer and has anti-riot effect, suitable for various occasions, but the main disadvantage is that once the panel has water droplets or dust It will make the panel's response slow and even not work.
According to the working principle of the current touch panel and the medium for transmitting information, it can be divided into: resistive type, infrared type, capacitive induction type and surface acoustic wave type. The characteristics of various types of touch panels can be seen in the table below.
Generally, information products with touch panels are mostly placed in public places or indoors to facilitate user operation; however, there is a big difference in placing seemingly fragile equipment on the car. How to ensure that There will be no problems during the operation or placement process. Here are some common problems:
Problems that may occur when connecting with equipment in the car
The general touch panel is suitable for serial port signal transmission, and the signal is obtained from PS / 2, while the TPS panel is directly powered from the host power supply, which is the focus of electrical design must be considered; in addition, the structure is also very important, because the touch panel is It is made of special materials and is easily damaged. When integrating with the equipment on the vehicle, the panel may be pressed too tightly or too loosely, which may cause problems. Then there is the software problem, mainly refers to the installation of the driver. Do not install two or more touch panel drivers on a host, otherwise it will become unusable.
The operating temperature of automotive touch panels seen on the market is generally between -40 ℃ and 85 ℃, and according to the actual measurement data of the car manufacturer, the temperature of the hot spot above the dashboard in the car is under the bright sun in the summer when the vehicle is parked without shading It can even be as high as 105 ° C, which is why the recording cassettes and CDs in the car are baked and deformed, so the highest temperature in the car is not only 85 ° C. When the car's temperature drops from as high as 100 ° C to room temperature, both car audio and DVD can operate normally, but the touch panel may cause abnormal conditions. The following is an introduction to the products of major touch panel manufacturers in Taiwan, from which you can understand the main technical principles, performance and applications of touch panels.
The main technical principle of Fujingtong technology products is to use indium tin oxide (ITO) conductive glass and conductive film (ITO Film) as the main raw materials. At the same time, there is a dot spacer (Dot SPACer) between the upper and lower transparent electrodes. A pen or other medium applying pressure to the upper electrode will make the upper and lower electrodes connected and produce a potential difference, and further display the coordinate position of the pressure medium on the screen.
The application range of Fujingtong touch panels is very wide, including: portable communications, consumer electronics and information products, such as: personal digital assistants, palm-sized computers (Palm-Sized PC), electronic dictionaries, handwriting input devices, information appliances ( InformaTIon Appliance), a new generation of digital broadband mobile phones, stock market information displays. Use of transportation means, such as: large vehicle recorder, GPS satellite navigation system, multimedia audio-visual equipment, vehicle driving information display.
Industrial uses, such as: automation control systems, remote / central monitoring systems, workstation operating systems, management information systems. Use of public information, including: airport guide system, cultural relics introduction system, land administration information inquiry system, etc.
The ELOTOUCH touch display glass is covered with a sensor that transmits and receives voltage in the X-axis and Y-axis directions. The touch panel controller sends an electrical signal of 5 MHz to the transmission sensor. The sensor then converts the signal to ultrasound on the surface of the glass plate. These sound waves directly pass through the front reflector of the touch panel through a beam of reflectors to receive the sound waves and guide them to the receiving sensor, and then the sensors will be converted into electrical signals and converted into a digital map on the surface of the touch panel.
The main features of its products include: durable scratch-resistant glass surface, even if water droplets adhere to the panel or severe scratches appear, it can operate normally, stable and drift-free, touch response accuracy is high, fast, anti-electronic interference, intelligent touch response ; There are flat curved surface and cylindrical touch panels that can supply and meet different design requirements of customers, in addition, you can also choose glass with anti-glare effect.
Wanda Optoelectronics has mature expertise in touch panels, and has innovatively developed touch panels with good quality and price advantages. In addition to having professional touch panel process technology, Wanda's production line is also the most advanced, such as high-performance touch panel test equipment and world-renowned automatic control production equipment, with strict quality control and more efficient processes. Production of high-standard touch products.
In addition to continuing to maintain its leadership in the field of touch panels, Wanda Optoelectronics has a very rich product line, including: five-wire resistive touch panel, capacitive touch panel, five-wire resistive controller and four-wire resistive controller and capacitor Type controller.
Universe Optoelectronics has the only filmless capacitive touch technology (US patent) in Asia. The filmless capacitive touch technology breaks through the traditional process and adopts pure glass process, that is, all processes are completed directly on the glass. Therefore, it has the characteristics of high hardness, waterproof, fireproof, dustproof, scratchproof, high light transmittance and high durability, and its durability is more than 50 times that of the general four-wire resistive touch panel. Cosmic Optoelectronics' filmless capacitive touch technology has passed the independent product research and development project audit of Taiwan Industry Bureau.
The TC-7000 / TS-7000 products produced by filmless capacitive touch technology can be used in Kiosks, Gaming, ATM, Military, PublIC ACCess, MeDICal & AerosPACe and other fields.
With the increasing advancement of TFT-LCD technology, the display panel is enlarged and the width of the frame is shortened, and the traditional labyrinth circuit process cannot shorten the frame accordingly, resulting in obstacles to lamination and assembly. Silver-carbon circuit technology can completely solve this problem, so that the touch panel and the TFT-LCD can be completely closed. At the same time, the patented silver-carbon circuit technology can also improve the linear function of the touch panel and make the touch function more accurate. The patented silver-carbon circuit technology can also simplify the touch panel manufacturing process and reduce manufacturing costs.
After the Thermal shock -40 ℃ ～ 110 ℃ test 100Cycle, the accuracy of Liangying car touch panel can reach more than 99% (that is, the linear error is less than 1.0%), which is a touch product worthy of trust by car equipment manufacturers. The most important feature of the touch panel is the touch accuracy. The general standard uses the linear error of 1.5% as the criterion, but the touch error of its automotive products is still below 1.0%.
Its main feature is that the manufacturer ’s car touch panel structure is Film / Glass, which is much safer than the Glass / Glass structure. In the unfortunate event of a car accident, the upper glass will not break and cause injuries to people. / Glass structure feels better than Glass / Glass.
The main characteristics of the four, five, and eight touch panels that are created for precision can be adapted to different environments in response to different designs. The size is also from 3 inches to 17 inches. The standard product line is quite rich. Under the advanced and precise product design, we obtain a complete set of touch panel solutions, including: touch panel, control card and driver.
While car manufacturers generally require high resolution on-board equipment, high-transparency display products can be designed with different thicknesses. In addition, Chuangwei's precision touch panel controller also has RS-232 and USB transmission interfaces, as well as MICROSOFT OS and LINUX OS in the driver program, and has passed strict industrial specifications testing.
In order to introduce high-quality advanced technology, Interface Optoelectronics cooperates with Japanese technology to introduce complete touch panel technology. Its main job is to entrust the development and mass production process of the new Touch Panel commissioned by the customer.
According to Optoelectronics, its actual production yield is close to 95%. The interface photoelectricity inherits the unique non-etching process of the Japanese factory. Compared with the general process technology, its main features are: improved life-etching will hurt ITO and residual photoresist on the glass surface. The etching process immerses ITO in acid solution, resulting in Surface damage after ITO melting; cost reduction-reducing process acid and alkali addition and wastewater treatment procedures, in line with environmental protection requirements; better linearity-etching and photoresisting steps to avoid linear degradation; larger visible area-etching process must be Etching the ITO at the position of the four wires on the glass and then printing it requires a wider space. The non-etching process is not necessary, so the touch panel of the same size and the interface photoelectric products have a larger action area.
Shiqin's touch panel is mainly composed of two thin layers on the top and bottom, the upper layer is made of polyester compound, the lower layer is made of glass, and a uniform transparent conductive film is coated on the top, and the matrix-like dots are arranged between the two planes It is used to support the upper and lower layers so that they maintain proper spacing. When an external force is applied to the upper layer plane, a short-circuit condition is formed by contact with the lower layer. According to the upper and lower two-layer circuit design and the control circuit operation, the touch position can be recognized in real time. Where.
Compared with the four-wire resistive type, its products have a lower drift rate and higher touch resolution, fast touch response time, touch by hand (either gloved touch or pen touch), can Withstand the harsh surface pollution, tight assembly, flat and spherical screen design features. It is suitable for cash registers, industrial process control, handheld computer medical equipment, handheld wireless phones, office automation equipment and transportation systems.
Digital Audio,Digital Audio Speakers,Conference Powered Amplifier,Digital Audio Power Amplifier
The ASI Audio Technology Co., Ltd , https://www.asi-sound.com