From the phone to a laptop, tablet, and then to one of the computers, smart TV, touch screen became the most popular elements of nowadays electronic products, this popular trend is changing the way people live. We strive for physical buttons - both T9 or QWERTY With advances in technology and mature, nowadays is "no touch is not the era of large-screen phone. In the body of the phone, the maturity of the touch screen has basically been close to or even catch up with the traditional physical buttons, which also accelerated the demise of the physical buttons phone is based on the same touch as the main mode of operation of the Tablet PC also squeeze the traditional PC market.
The pros and cons of the points of the touch screen
Folks on to the next to Treemass youth, people have started using an electronic components with a touch screen, and enjoy a more intuitive and convenient operation, but at the same time is also accompanied by another phenomenon: even if the hardware configuration has been reached the smooth running system requirements of the application, but the user does not have any sense of smooth, like cottage manufacturers, the price is very attractive Android phone, although sometimes high but their fluency but not with the hardware - Caton phenomenon in direct proportion touch screen has become a short board.
The touch screen is a necessary part of human-computer interaction, so it's sensitivity and response speed is particularly important, the majority of manufacturers to purchase and use capacitive touch screen is present, the most mature application solutions, the appearance of seemingly the same " transparent within the panel was a great tide, the touch screen is good or bad a direct result of human-computer interaction in the process of smooth or not.
The structure of the capacitive touch screen
The capacitive touch screen is like a sandwich on a platter, "plate" is closest to the electronic equipment electrical components, it has played a role shielded electrical signal, in order to avoid interference to the touch screen; contact with the "plate" , as well as the top layer of bread "for the non-conductive (dielectric) glass, which is play a protective role; folder in the middle of the two layers of bread", "butter" is the most critical condiments, responsible for the induction of the human body electric field and detect the touch point, an electronic device that can give users a smooth feel, thanks to the "seasoning" to enhance the flavor.
The working principle of the capacitive touch screen
The capacitive touchscreen internally by the driving electrode and the receiving electrode, the drive electrodes to the projection of the low-voltage high-frequency signal to the receiving electrode to form a stable current, grounded because the body when the human body touches a capacitive screen, a finger with a capacitive touch panel is formed an equivalent capacitors, high-frequency signal can be through this equivalent capacitance which flows into the ground, whereby the receiving end receives the charge amount is reduced, while when the finger closer to the transmitting end, the charge is reduced more significantly, the last received according to the receiving end The intensity of the current to determine the touch point. As for the multi-touch, simply said, is the split-screen, in each region of each mutual capacitance module works independently, so capacitive screen can be independently detected by the touch of the area, for processing After multi-touch.
Sensitivity
Intermediate "sauce" determine the sensitivity and response time of the capacitive touch screen. Affect the sensitivity of which is called the contact diameter. We can be a capacitive touch panel is divided into a small divide the region, the contact diameter is the distance between the two close to the regional center, the smaller the contact diameter, the higher recognition rate of the touch screen, for example, some touch-screen the area of the entire finger belly pressed to recognize the signal, while others need only the fingertips.
Get the latest Windows 8 operating system, Microsoft's official minimum the contact diameter required for Win8 touch screen 9mm, which means that we use the touch screen, finger to compare hard press on the screen to ensure that the contact area. As a yardstick to 9mm in diameter, in some cases, the system may not recognize the swipe gesture, for example, you get the contact area than the capacitive pen to write with your finger, but only intermittently displayed on the touch screen handwriting, even no response, so the smaller the diameter of the contact on behalf of the more excellent the touch screen.
Response Time
The contact diameter determine the sensitivity of the touch screen, and the response time is another major factor affecting the touch screen feel. Finger or capacitive stylus to write or draw on the screen, we will find the trace on the screen at a distance with his writings. If our fingertips only slowly across the screen, then the gap between the different touch screen response time will not be reflected very obvious. But in fact after the customary system to find, browse the web, handwritten text, graphics rendering operation, the speed of movement of fingers or his writings will become soon. If the touch screen response time is too long, then displayed on the screen will be seriously behind the finger or the tip of the brush, the user will be able to slow down, thus affecting the operating experience.
Same the the Microsoft official standard, which provides touch screen response time should not be greater than 50 milliseconds, including the diameter of 9mm contacts described above, to ensure that the hardware requirements, which are the most basic of all the market pre-installed Win8 operating system touch screen notebook are able to meet this standard, but most are not just passing, if you want to really enjoy the superior experience you need to meet higher standards.
Take Asus VivoBook S400 For example, this super pole is equipped with touch-screen contact diameter reduced to 5 mm, Win8 system with your fingers sliding operation without any interruption Caton phenomenon, even smaller capacitance of the contact area rapid writing pen can also be handy.
At the same time, S400 resistance to outside interference, the use of signal booster and hopping technology, effectively improve the signal to noise ratio and improve the response time of the touch screen. 50 millisecond response time standard with Microsoft, Asus VivoBook S400 will raise this standard to 30 milliseconds, so fingertips optional touch screen panel can get immediate response.
Hardware as infrastructure is certainly important, but now has become one of the most important aspects of human-computer interaction touch screen instead of physical buttons, at this stage, the majority of manufacturers to purchase and use capacitive touch screen look basically the same, with the naked eye can not identify the nature of , which also makes the touch screen becomes an invisible barrier, excellent touch screen can be a good assistant for other hardware and system applications, poor touch screen will limit other hardware to play a short board, thus affecting the user experience, so optional touch-screen equipment, particularly large-size touch-screen notebook, consumers should take the time to personally experience.