Led display screen as a high-tech product, after more than 20 years of market development, not only can effectively convey limin information, but also can bring audience audio-visual enjoyment, in people's daily life plays an essential role. Led display drive IC plays an important role in the quality of led display.
What is an led display drive IC
Led display is a large-size flat panel display which is mainly composed of led and its driving chip. led display driving IC is a key component, it is like the central nervous system of human brain, and it is in charge of the whole body limb action and brain thinking consciousness operation. The performance of driver chip plays an important role in the display quality of led display screen. In recent years, with the rapid development of led market, many powerful IC manufacturers, including Japan's Toshiba ( Toshiba ), Sony ( Sony ), Texas instruments ( t1 ), Taiwan's accumulation ( MBL ) and point crystal technology ( sitl ), etc., began to produce led special drive chip.
Function of driving IC
In the operation of the led full-color display screen, the function of the driving IC is to receive the display data conforming to the protocol ( from the information source such as the receiving card or the video processor ), internally produce PWM and current time change, and output PWM current related to brightness grayscale refresh and the like to illuminate the led. The peripheral IC composed of the driving IC, the logic IC and the mos switch acts on the display function of the led display screen and determines the display effect of the led display screen.
Classification of led display drive IC
Led driver IC can be divided into general chip and special chip.
So - called universal chips, the chip itself is not specifically designed for led, but some logic chips with led display part of the logic function ( such as string 2 parallel shift register ). Basically used for low-end products of led display screen, such as indoor single and double color screen, etc. General IC manufacturers can produce such chips.
And that special chip refer to a driving chip specially designed for the led display screen accord to the luminous characteristics of the led. Led is a current characteristic device, that is, under the premise of saturated conduction, its brightness changes with the change of the current, rather than by adjusting the voltage across it. So one of the biggest characteristics of dedicated chips is to provide a constant current source. Constant current source can ensure the stable driving of led, eliminate led flicker phenomenon, is the premise of led display screen display high quality picture. Some special chips have added some special functions, such as led error detection, current gain control and current correction, to meet the requirements of different industries.
Evolution of led display driving IC