Touch screen technology facilitates people's operation and use of computers. It is a promising interactive input technology. Therefore, it has received widespread attention from various countries and invested a lot of manpower and material resources in its research and development. New touch screens are emerging all the time.
1. Touch pen: A touch screen operated by a touch pen is similar to a whiteboard. In addition to displaying interfaces, windows, and icons, the touch pen also has the functions of signing and marking. This kind of touch pen has greatly enhanced functions than the early light pen that only provided menu selection.
2. Touchpad: The touchpad uses pressure-sensitive capacitive touch technology and has the largest screen area. It consists of three parts: the bottom layer is the center sensor, which is used to monitor whether the touch panel is touched and then process the information; the middle layer provides graphics, text, etc. for interaction; the outermost layer is the touch surface layer, which is made of very strong Made of plastic material. When a finger touches the outer surface, this information can be sent to the sensor within 1 / 1000s and the login process can be performed. In addition to being compatible with PCs, it also has the characteristics of high brightness, clear images, and easy interaction. Therefore, it has been used in pointing information query systems (such as electronic bulletin boards) and has received very good results.
3. Touch screen: It can be used in the studio to use the touch screen review system. Simply put, the input and output are combined into one. There is no need for mechanical buttons or sliders. The display screen is the human-machine interface. The entire touch screen system consists of LCD, touch screen, touch screen controller, main CPU, and LCD controller. The multi-touch screen controller is the core of the touch screen module. The touch screen controller uses PSoC (Programmable System on Chip) technology. PSoC is a mixed-signal array that integrates programmable analog and digital peripherals and MCU cores. Therefore, PSoC's flexibility, Features such as programmability and high integration are widely used in touch screen controllers. Touch screens built as of 2013 are available in 32, 46 and 70 inches, support 1080p FullHD resolution, support multi-touch control without any additional settings, and can be placed vertically or horizontally. What's more convenient is that it uses standard HDMI, FireWire and USB interfaces. Just plug in the power and connect to a Mac, Linux or Windows PC to start using it.
The development trend of touch screen technology has the characteristics of specialization, multimedia, three-dimensional and large screen. With the development of the information society, people need to obtain a variety of public information. The public information transmission system with touch screen technology as the interactive window uses advanced computer technology to use text, images, music, and explanations. , animation, video and other forms, it introduces various information to people intuitively and vividly, bringing great convenience to people. We believe that with the rapid development of technology, touch screens will play an important role in the popularization and utilization of computer technology. Inputting on the touch screen under the hand is the same as full keyboard input. The touch screen is not as efficient as physical keys. The reason is that the input method needs to locate the position of the fingers. For example, when operating a computer keyboard with both hands, the middle finger of the left index finger is positioned on the F key, and the middle finger of the right hand is positioned on the J key. keys, and the touch screen cannot be positioned like the bumps of the keys or the input feel, making it difficult to achieve efficient touch typing.
The clicks on the touch screen itself are not as accurate as the physical buttons. The target area clicked on the touch screen does not actually click on the target area, but is biased below the center of the target. Regardless of whether it is one-handed or two-handed input, the touch screen itself has a high probability of accidental clicks. In a key-intensive area like a virtual keyboard, the clickable area of ??each key is limited, and the probability of accidental clicks is higher.
. When clicking, there is no clear tactile feedback like a button. Since the finger click will cover the button, the iPhone button will enlarge the visual feedback when clicked.
. The range of finger movement is large. When inputting on a key-pressed mobile phone, the finger is limited to the key. However, when inputting on a touch screen and switching input boxes, the finger still switches between the non-virtual key area and the key area. When inputting Chinese, the character does not appear on the screen immediately after clicking the button like in English. The pinyin string will be displayed to select the desired Chinese character and then appear on the screen. Your finger needs to click on the alternative word.
The touch screen does not have key combinations, and entering numbers and symbols requires switching panels.
Moving the input cursor requires precise clicks or the help of a magnifying glass. Physical buttons can directly use the direction keys to switch the cursor, which is inconvenient for correcting wrong characters.
The conventional touch screen Chinese Pinyin input process can be divided into the following steps:
1. Enter letters, and the keyboard provides letter input suggestions. For example, if you input the initial consonant w, you can combine the finals "a, u" and other highlights, but this is only valid for full spelling and has no meaning for simplified spelling. When inputting in Simplified Pinyin, only the first code of Pinyin is entered. Proper use of Simplified Pinyin when inputting phrases can greatly improve the input speed. The disadvantage is that duplicate codes are prone to occur.
2. After inputting letters to form a letter string, the words will be intelligently segmented and candidate words will be displayed. A single candidate word is based on matching letters in the vocabulary, phrases, phrases and long sentences need to calculate the probability of Chinese character combinations. The user's use of the input method is also a process of continuous updating of training. The longer the use time, the more in line with the personal input habits of the vocabulary. Methods for updating the vocabulary include:
1) Adjusting the order of single letter or full spelling matching candidate words. For example, when "hao" is entered, the first candidate word "hao" has a greater probability of being selected. However, if the user selects "hao" multiple times, then "hao" may be adjusted to the first candidate word. The initialization lexicon may be extracted from dictionaries, commonly used short texts, articles and Internet terms, etc. The probability of candidate words, Chinese character combinations and associated words can be calculated from the lexicon. More complex long sentence input requires analysis of Chinese Language habits.
2) Users can adjust the probability of word candidates in the thesaurus, or they can customize phrases to establish associations with words that are not related, commonly known as self-made words. For example, if the user enters "nima" manually, it will become a candidate word the next time the same letter is entered. The computer calculation is more intelligent. Enter "Ni" and "Ma" twice, and it is possible to form phrases according to the order of input.
3) The network and group users will “metabolize” the original default vocabulary. If the probability that most users input "Nima" exceeds a certain probability and becomes a popular word, the word can be updated to the lexicon of all users. When several sources of the lexicon are updated, it will also affect the lexicon, such as the popular event "Guo Meimei" that appeared on the Internet.