cell phone jammer can maintain a quiet environment for reading and studying

In short, three chords, chord 4 is a grade, a grade of 16 polyphonic and 32 polyphonic and 40 polyphonic is a grade, a grade of 64 chords. With the color of the increasingly popular cell phones, cell phone screen material is also more important. LCD color screen cell phones because the quality and R & D vary, the types generally have TFT, TFD, UFB, STN and OLED are several. Generally speaking, the colors can be displayed to show the more complex images, richer level of the screen. Remove the top LCD outside these categories, but also in some cell phones to see some other LCD, such as the Japanese SHARP GF-screen and CG (continuous crystalline silicon) LCD. A specific shielding position of cell phone jammer should be added for the signal dead zone.
Two kinds of LCD compared to a completely different kind, GF for the STN improved, to improve the brightness of the LCD, while the CG is to achieve high-precision high-quality LCD QVGA (240 × 320) pixel size resolution. STN is a key component of early color, was only able to display 256 colors, even after transformation can display 65536 colors or 4096 colors, but now the general is still 256-color STN, the advantages are: low cost, low energy consumption. TFT's brightness, high contrast, strong sense of hierarchy, bright colors. The disadvantage is more power, higher cost. UFB is specifically designed for cell phones and PDA's screen, it is characterized by: slim, high brightness. You can display 65,536 colors, 128 × 160 resolution can reach a resolution. The cell phone jammer system is more suitable for the classroom of the school.
UFB display uses a special grating design, can reduce the pixel pitch for better picture quality. STN and TFT UFB combines the advantages of: less power than TFT, and STN similar price. STN (Super Twisted Nematic) screen, also known as super-twisted nematic liquid crystal display screen. In the traditional monochrome LCD display to add the color filters, and color of each pixel in the display matrix is divided into three pixels, respectively, through the color filter display of red, green, and blue, in order to display color the role of color to light green and orange for the main. STN screen is reflective LCD, it has the advantage of power consumption, but in a dark environment, clarity is poor. STN is our contact with the most material types, there are mainly divided CSTN and DSTN, it is a passive matrix LCD devices, so the power consumption, energy saving, but what should be a slower time for 200 ms. The surface-mounted technology will be utilized for this kind of cell jammer .
CSTN commonly used delivery methods lighting must be used outside illumination, known as backlighting, lighting to be installed behind the LCD. TFT (Thin Film Transistor) that thin-film field-effect transistors, active matrix liquid crystal display is one. It can be "actively" on the screen to control each individual pixel, this can greatly improve response time. Generally faster TFT response time of about 80 ms, and the viewing angle, and can reach 130 degrees, mainly used in high-end products. The so-called thin-film field-effect transistor, liquid crystal display is the LCD pixels are each integrated in the subsequent thin-film transistor to drive. Which can be high speed, high brightness, high contrast display screen information. The customer has the high requirement of the quality level of cell phone jammer .
TFT active matrix LCD display part, the technical use of "active matrix" approach to drive, the method is the use of thin-film transistor technology into the electrode by using the scanning method "active pull" control points of any open display and off, when the first light source up through the lower polarizer revealed, with the liquid crystal molecules of light transmission through shading and light to achieve the purpose of display. TFT-LCD is a thin-film transistor liquid crystal display liquid crystal display, or "true color" (TFT). For each pixel TFT LCD with a semiconductor switch, each pixel can be directly controlled by the pulse points, which are relatively independent of each node, and can be continuously controlled. The jamming range of cell phone jammer can be referred to.