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LCD Cable

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OSD, short for On Screen Display, is used On CRT/LCD displays to produce special glyphs or graphics On the Screen of the Display to give the user information.

In CRT/ LCD display, the working principle is to generate a complete picture control by horizontal and vertical synchronization signals. The external environment can generate image signals at appropriate points in time to generate images on the screen.


TTL (transistor-transistor Logic) is a transistor-transistor Logic in which the TTL level signal is generated by a TTL device. TTL device is a kind of digital integrated circuit. It is made by bipolar process and has the characteristics of high speed, low power consumption and many varieties.


TTL interface is an interface for data transmission in parallel mode. When using this interface, it is not necessary to use special interface circuits at the driver board end and the Lcd Panel end, but the TTL data signal output by the driver board main control chip is directly transmitted to the LCD panel input interface through the cable. Due to the high voltage of TTL interface signal, many connections and long transmission cables, the anti-interference ability of the circuit is relatively poor, and electromagnetic interference (EMI) is easy to occur. In practical applications, TTL interface circuits are often used to drive small size (below 15in) or low Resolution LCD panels. The TTL maximum pixel clock is only 28MHz.


TTL is the only signal that can be recognized by TFT-LCD when the signal is emitted. The early digital processing chips were all TTL, that is, RGB is directly output to TFT-LCD.

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