OFweek Semiconductor Lighting Network: LED display kanban as a medium of information transmission, the application is increasingly diversified, from monochrome, two-color to full-color display, color accuracy, resolution, pixel density, and screen update rate and other display specifications are developing year by year, LED The complexity of the drive system has also increased, and the requirements for LED driver ICs have become stricter.
Taking LED color accuracy as an example, in response to full color display applications, LED driver ICs must output constant currents of different amplitudes for RGB three-color LEDs to obtain optimal white balance color performance. The constant voltage LED driver architecture with low color accuracy and low cost, such as monochrome and two-color LED billboards, has not met the demand.
In addition, with the light decay phenomenon that occurs during long-term use of LEDs, LED driver ICs have individual LED pixel position correction functions, which is also the direction in which IC design designers shape products.
As the dynamic picture broadcast quality requirements increase, the frame update rate (frame rate) needs to increase the speed to match. Only the traditional host controller (pulse Width Modulation (PWM)) sends the picture timing information in a unified manner, and the computing load on the host controller will increase as the update speed increases.
If the main controller directly increases the operating load of the operating clock due to large strain, the LED drive IC current output response time will be compressed, and then over voltage and other problems will be generated. Lifetime and long-term display performance, kanban LED driver IC built-in PWM module (block) has become the development direction of various IC industry.
[Edit: Vessel]
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