Explanation of mobile phone parameter nouns

Introduction of mobile phone parameters

< < gt thin film transistor

Thin film transistor (TFT) means that every pixel on a liquid crystal display is driven by a TFT integrated behind it, thus displaying screen information with high speed, high brightness and high contrast. TFT belongs to active matrix LCD.

TFT-LCD liquid crystal display is a thin film transistor type liquid crystal display, that is, "true color" (TFT), which not only improves the response speed of the display, but also accurately controls the display color scale. TFT liquid crystal display is characterized by good brightness, high contrast, strong layering and bright colors, but it also has the disadvantages of high power consumption and high cost.

UFB LCD screen

UFB LCD has the characteristics of ultra-thin and high brightness. UFB-LCD is a display screen specially designed for mobile phones and PDA, which has the characteristics of ultra-thin and high brightness. The display screen can reduce the pixel spacing to obtain better image quality.

The contrast of UFB LCD screen is twice that of STN LCD screen, and its brightness is equivalent to that of TFT display screen in 65536 colors, but its power consumption is less than that of TFT display screen, and its price is similar to that of STN display screen, which can be said to combine the advantages of these two existing products.

Super twisted nematic

STN is the abbreviation of super twisted nematic. The gray-scale mobile phone screens we used in the past are all STN, which has the advantage of low power consumption, and the biggest advantage is power saving. Generally speaking, the performance of STN screen in color is still far less than the above screens.

In addition to gray level STN, there are two main types of STN: CSTN and DSTN. CSTN (Color STN) transmissive LCD displays well in normal light and dark light, but it is difficult to distinguish the display contents outdoors, especially in the sun, and the backlight needs power to generate illumination light, which consumes electric energy.

Color scale and resolution

Color scale is an index standard to express the brightness of display, which is what we call color index. The color fullness and fineness of the display screen are determined by the color scale. Industry standards include 256 colors, 4096 colors, 65536 colors and 260000 colors. And the color scale of color screen mobile phone is improved by 16 times.

At present, the color scale index of color screen mobile phones can be divided into three grades from low to high, the lowest is 256 colors, followed by 4096 colors, and the current domestic mainstream is 65536 colors. 65536 color, commonly known as 16 true color, has fully met our naked eye recognition needs; At present, the highest level in China has reached 260 thousand colors.

Resolution is the number of pixels displayed on the screen. Of course, the number of pixels also means that the clearer the screen, the sharper the performance of the text. 128× 160 has become the basic standard for 65K color screens.

Camera and its pixels

The built-in camera has a built-in CCD (Photocharge Coupled Device). The built-in camera generally uses the display screen of the mobile phone to display images and the memory of the mobile phone to save data. Pixel is a standard to characterize the shooting ability of a camera, and its height determines the resolution of taking photos. That is to say, in general, the higher the pixel, the higher the definition of the photo taken. At present, there are 6,543,800 pixels in the market, 300,000 pixels in the mainstream, and the highest click volume is 6,543,800+0.3 million.

infrared data association

Infrared data association is the configuration standard of a new generation of mobile phones, which supports data exchange between mobile phones and computers and other digital devices. Through infrared data association, various mobile devices can exchange data freely.

Infrared ray has poor diffraction ability to obstacles, which is more suitable for point-to-point linear data transmission that requires short-distance wireless communication. For example, it is very simple to surf the Internet wirelessly with a mobile phone equipped with infrared data association. You can surf the Internet directly as long as the infrared connection protocol is set.

EMS enhanced audio-visual SMS

EMS: (enhanced short message service) enhanced short message service. Compared with SMS (text message), EMS has the advantage that it can send simple images, sounds and animations in addition to short text messages like SMS. EMS is a transitional technology, from SMS text information to MMS multimedia information.

Multimedia message

MMS: (Multimedia Message Service) Multimedia Message Service. WAP (Wireless Application Protocol) is a carrier for transmitting video, pictures, sounds and words.

MMS is the "Third Generation Short Message Service" after SMS (Text Short Message Service) and EMS (Enhanced Short Message Service). MMS greatly expands the types of media that can be sent and received. Words, simple pictures and ringtones are natural, and complex pictures, such as photos, big charts, music clips and video clips, are the place where MMS comes in. At present, China Mobile's "MMS" service is open to users of "GSM" mobile phones, and 0.5 yuan.

Mobile video on demand

Video-on-demand: VOD(Video On Demand) refers to interactive multimedia video-on-demand, which uses network and video technology to realize on-demand viewing and arbitrary playing of programs, integrates dynamic video images, static pictures, sounds, words and other information, and provides users with real-time, interactive and on-demand services. Mobile video-on-demand needs the support of 2.5G and 3G communication networks and high-profile color screen mobile phones.

Ciava

The so-called KJAVA can cooperate with the current JAVA environment and let programmers switch between different platforms. JAVA is an interactive web design technology that has been widely used before a project. The built-in KJAVA programming language allows users to download games, video games and cartoon pictures from remote servers to their mobile phones through the Internet. Coupled with data transmission, "downloading" services and updating data will be very easy.

Bluetooth (Bluetooth)

Bluetooth is a short-range wireless communication technology. Electronic devices can be connected to each other via Bluetooth. Electronic products equipped with Bluetooth technology can communicate with each other within ten meters, and the transmission speed can reach 1 megabit per second. In the past, the transmission technology in infrared data association required the distance of electronic equipment in sight. Now, with Bluetooth technology, such troubles can be eliminated.

Wireless application protocol

WAP was established in 1997 in the WAP forum established by communication giants such as Ericsson, Nokia and Motorola. Information on the network can be transmitted to mobile phones or other wireless communication terminals. It uses a markup language WML similar to HTML (wireless markup language is not wireless markup language), which is equivalent to HTML (Hypertext Markup Language) on the Internet, and can directly access general web pages through WAP gateway. Through WAP, users can use wireless communication terminals to obtain instant information on the Internet or information on the company website anytime and anywhere, and truly realize wireless Internet access.

Gsm (Global System for Mobile Communications)

One of the most mature digital mobile phone network standards in the world. At present, about 75% of mobile phones in the world are based on GSM.

General packet radio service

GPRS is a new packet data carrying service developed on the existing GSM system, which increases the highest data communication speed of GSM from 9600bit/ s to171.2kbit/s. We can understand GPRS as a higher level of GSM.

code division multiple access

A digital interface technology that has been applied to business recently has the advantages of high frequency utilization and low power consumption of mobile phones. CDMA introduced by China Unicom belongs to 2.5 generation technology. At present, the standards of the third generation CDMA include WCDMA, CDMA2000 and TD-SCDMA.

3G (Third Generation Mobile Communication Technology)

Compared with the first generation of analog mobile phones (1G) and the second generation of GSM, TDMA and other digital mobile phones (2G), the third generation of mobile phones generally refers to a new generation of mobile communication systems that combine wireless communication with multimedia communication such as the Internet. It can handle images, music, video streams and other media forms, and provide a variety of information services including web browsing, teleconference, e-commerce and so on. In order to provide this service, the wireless network must be able to support different data transmission speeds, that is, in indoor, outdoor and driving environments, it can support at least 2Mbps (megabits per second), 384kbps (kilobytes per second) and 144kbps respectively.

MMC, SD, TF external expansion cards

Compared with the traditional mobile memory card, the most obvious external feature of MMC(MultiMediaCard) is its smaller size-only the size of an ordinary stamp (about the size of a CF card 1/5). In addition, due to the lower working voltage, MMC is more energy-saving than previous generation products such as CF and SM, and its current common capacity is 64MB/ 128MB, ATP.

SD card is a secure digital card-a secure digital memory card, which has many characteristics such as large capacity, high performance, especially security. Compared with MMC, it has a password authentication function (SDMI specification) for data copyright protection. Now it is mostly used in MP3, digital video cameras, e-books, microcomputers, AV equipment and so on. The size is slightly thicker than that of MMC card, and the capacity is much larger. In addition, the reading and writing speed of this card is 4 times faster than that of MMC card, reaching 2MB/ s, and it is compatible with MMC card. Most sockets of SD card support MMC card.

TF card is the smallest flash memory card developed by MOTO Company at present. TFlash card is an ultra-small memory card, the size is only 1 1mm× 1mm, and the maximum storage capacity at present is 128MB. By converting the card, TFlash card can be converted into SD interface of ordinary card reader.