The static drive and scanning drive of LED display screens have their own advantages and disadvantages, and need to be selected according to specific application scenarios and needs.
The advantages and disadvantages of these two driving methods and applicable scenarios are introduced in detail below.
Static drive
Advantages:
1. High display quality: Each pixel has an independent driving circuit, which can achieve high-precision brightness and color control, stable display, no flicker, and good color reproduction.
2. Simple programming: Since each pixel can directly receive the control signal, it is relatively simple in programming and control.
3. Low CPU occupancy: When the display content is not updated frequently, the CPU occupancy rate is low, which improves the overall efficiency of the system.
Disadvantages:
1. High cost: As the number of pixels increases, the number of driving circuits required will also increase significantly, resulting in an increase in overall cost.
2. High power consumption: Since each pixel requires an independent driving circuit, the power consumption is high when used on a large scale.
3. High hardware overhead: When the number of pixels is large, the required I/O interfaces will also increase, increasing the hardware overhead.
Scanning driver
Advantages:
1. Low cost: Controlling pixels by scanning row by row or column by column reduces the number and cost of driving circuits.
2. Low power consumption: Since not all pixels are lit at the same time, the power consumption is relatively low.
3. Supporting large-size displays: When there are a large number of pixels, scanning drivers can better meet the needs of large-size displays.
Disadvantages:
1. Display quality may be slightly inferior: Due to the use of fast scanning, some details may not be as fine as static drivers.
2. High CPU occupancy: During the control operation process, the CPU needs to execute the display subroutine regularly to ensure the normal display of the display, so the CPU occupancy rate may be high.
3. High requirements for driver IC: In order to achieve fast scanning and precise control, the performance and stability of the driver IC are required to be high.
Applicable scenarios
* Static drive: Applicable to application scenarios with high display quality requirements and relatively small number of pixels, such as indoor high-definition display screens, precision instrument display screens, etc.
* Scanning drive: Suitable for application scenarios with a large number of pixels and high requirements for cost and power consumption, such as large outdoor billboards, stadium displays, etc.
In summary, static drive and scanning drive each have their own advantages, and the choice of which drive method needs to be determined based on specific application scenarios and requirements.
In actual applications, comprehensive consideration can be made based on factors such as display area, number of pixels, cost budget, and power consumption requirements.