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LED display as a high-tech products has aroused great attention, using computer control, intelligent optical and electrical integration of the full-color display has been applied in a wide range of fields. Its pixels with LED light-emitting diode, a plurality of light emitting diodes arranged in a dot together constitute LED array, and thus constitute the LED screen. Through different LED drive mode, images can be obtained different effects. Therefore, the merits of the LED driver chip, the LED display on the display quality plays an important role. LED driver chips can be divided into general-purpose chips and a dedicated chip.
Universal LED display chip generally used for low-end products, such as indoor single, two-color screens. The most common is a general-purpose chip 74HC595, with 8-bit latch, serial-parallel shift register and the tri-state output. Each non-constant maximum output current of 35mA.
Since the LED is a current characteristic of the device, that is, under the premise of saturated conduction, the brightness change with the current size varies, as does the voltage across its changes. ASIC most important feature is to provide a constant current source output to ensure stable LED driver, LED eliminate flicker. With output current, constant current and other characteristics, suitable for applications requiring high current, high quality occasions, such as outdoor full color, indoor full color and so on.
LED screen with LED driver IC products SMT5026.SMT5026 built-in CMOS shift register and latch function, you can convert serial input data into parallel output data format.
The second part: LED display system composed of architecture
(1) display unit
This is the main part of the LED display screen, a light emitting material and the drive circuit. Indoor screen is the variety of unit display boards, outdoor screen is the unit cabinet.
(2) Host Controller
The role of the input digital RGB video signal buffer, gray transform, reorganize, and generates various control signals.
(3) Switching Power Supply
Use is 220V AC into a variety of DC to the various circuits.
(4) a transmission cable
Display data and various control signals generated by the master device twisted-pair cable to the screen body.
(5) Scan Controller
The board relies on data buffer, generating various scanning signals, and the duty cycle of the control signal gradation.
(6) dedicated graphics card and multimedia card (video card)
LED full color dedicated graphics card in addition to the basic functions of the computer display card, but also simultaneously output digital RGB signals and line field, blanking signal to the master device. Analog Video Signal multimedia card in addition to the above functions can also be input into a digital RGB signals (ie video capture).
(7) other sources and external devices
Including computers, televisions, Blu-ray, DVD, VCD, video camera and so on.
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