From simple buttons or buttons on computer keyboards, cell phone keypads, MP3 players, home appliances and even TV remotes to higher-order click and scroll features such as volume adjustment sliders, scroll wheels and trackpads, output locations (ie It is the result of the user's input or manipulation action that is completely different from the user's input position. And the commitment to make the input and output, that is, the visual and tactile, are completely consistent, which is the basic advantage of the touch screen. How to control the user complexly The transformation of action into an intuitive, convenient and productive experience is the ultimate challenge for user interface design. The user interface design must consider the five sensory needs of the user's vision, hearing, taste, smell and touch. It is necessary to take into account the impact of user requirements on components or systems. Most of the products currently available on the market, while effective, are mainly handled by separating the user's vision and touch.
At first glance, it is quite simple to make the vision and touch consistent, but it is actually a far-reaching technological breakthrough, because it will completely change the way users interact with electronic products. Therefore, some people call this the user interface revolution. . The transparent nature of the touch screen allows the user to directly 'touch' the display of different content on the screen, and people are amazed at the design of such a user interface. Because users no longer have to look for buttons on electronic devices, such as computer mice or keyboards or even dial-up buttons on mobile phones, they interact directly with applications that solidify in the device's 'brain' (ie its operating system). This is a revolutionary change that allows users to directly manipulate powerful operating systems and applications, all at the user's fingertips. Of course, we can use the mouse and trackpad to access the application on the computer screen, but this control is not a direct touch display screen, and does not allow the user to integrate with the screen and embedded applications. In fact, we can use the touch screen through various actions or gestures we can imagine, so that the display screen becomes vivid and vivid, and the touch can be easily interacted with as long as the line of sight is. At present, touch screens are mainly divided into three categories: single touch; multi-touch recognition of finger direction; multi-touch recognition of finger position.
Single touch screen
The function of the touch screen has evolved from simple to complex. The original product only supports the simplest control, that is, a single finger touches the screen to achieve control. Such as super-business POS terminals, or airport check-in terminals. In the past, we were only able to control through the mechanical buttons on the periphery of the screen, and the single-touch screen achieved a major advancement in the user interface. Machinery and new capacitive touch-sensitive buttons are used in homes, offices and all applications, such as cell phones, home phones, remote controls, televisions, computers and their various peripherals, game consoles, refrigerators, microwave ovens, ovens, radios and Automotive electronic control equipment such as air conditioners. Now, the single-touch screen shown directly integrates the user control interface on the display screen, so there is no longer a need for traditional mechanical buttons.
Figure 1: Single touch screen function.
This kind of screen brings two advantages to the user interface. First, the device design space is optimized, which is especially beneficial for small devices, because it can 'install' screens and buttons simultaneously in the same area; second, because the buttons can be integrated into the operating system In any of the applications, so the device uses a 'button' that can reach an unlimited number. The above functions are mainly based on resistive touch screen technology, and have been widely used in various applications such as consumer electronics, airport vending machines, POS terminals and car GPS systems.
Multi-touch screen - recognize finger direction
Although single-touch screens and resistive touch screens are revolutionary technologies, there are still two major drawbacks. One is that resistive technology relies on the physical motion of the touch screen [LU5], although the effect [LU6] is small. However, after normal wear and aging, the performance will decrease. Second, this technology only supports single-touch, that is, only one finger can be used to perform a single action on a certain area of ​​the screen at a time. Why is the user's interaction with the device limited to one finger? Apple made an invaluable contribution to the user interface revolution, and its iPhone uses an inductive capacitive touch screen. Even in a miniaturized device such as a smart phone, in order to fully utilize the functions of the application and the operating system, multiple fingers are required to achieve optimum usability. After the advent of the iPhone, it is now difficult for users to imagine how to perform photo zooming as shown in Figure 2, as well as changes in the orientation of albums and web page views, without the gestures of two fingers.
Other technology innovators continue to use this multi-touch technology on a variety of device systems, including Google G-1 and Blackberry Storm smartphones, MacBook Pro and HP touchsmart desktop computers and laptops, and portable media players. And many other applications. Now, users have new expectations, and hope to further improve the way users interact with their electronic products, and various electronic products have also fulfilled this new requirement of users.
Multi-touch screen - identify finger position
As with single-touch screens, there are limitations to multi-touch screens that recognize the direction of the finger, that is, the number of job points that the technology can simultaneously identify on the screen is limited. Why can I only identify two job points at a time? The user's two hands have ten fingers, and when the users interact with each other, more fingers appear on the screen. This is the origin of the multi-touch concept of recognizing the position of a finger, which enables manipulation of more than two fingers.
Cypress calls this technology 'multi-touch global input', which further enhances the reliable usability of touch screens to meet a wide range of feature-rich applications. Reliability means that we can capture the raw data of all the contacts on the screen with the highest precision, and minimize the confusion caused by the inaccurate positioning of the screen contacts. Usability refers to a number of powerful applications that benefit from the ability to control the screen with both hands or more than two fingers on different screen sizes. 3D interactive games, keyboard input, and map jobs are all targeted applications that use this touch screen feature.
Multi-touch global input technology now provides device and system OEMs with all touch data to help them develop next-generation, new and useful technologies.
Cypress Semiconductor's True Touch touchscreen solution is an example of a multi-touch global input. True Touch features the Cypress PSoC programmable on-chip system architecture that combines 8-bit microcontrollers with programmable analog and digital blocks for flexibility and configurability. True Touch's inductive capacitive touch screen controller can be extended to support a wide range of screen sizes, with flexible support for single touch, multi-touch recognition in the direction of the finger and multi-touch technology to recognize finger position. True Touch is highly integrated with external components and works with a variety of touch screen sensors or LCD display screens. The flexible PSoC architecture allows designers to easily modify at the end of the product design, something that other touchscreen products cannot.
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