Static drive and scanning drive of LED display are two different driving methods, which have significant differences in driving method, circuit requirements, cost and power consumption, and display effect.
Static drive
Definition:
Static drive means that each pixel on the LED display has an independent driving circuit. This driving method enables each pixel to directly receive the control signal and achieve fast and accurate display effect.
Working principle:
* Each LED pixel is connected to a driver IC, and the image is displayed by directly controlling the state of each pixel.
Advantages:
* High display brightness: Since each pixel has an independent driving circuit, a higher brightness output can be achieved.
* Good color reproduction: Independent driving makes the color control of each pixel more precise and the color reproduction is higher.
* Stable picture without flicker: Since each pixel is independently controlled, there will be no flickering phenomenon and the picture is more stable.
* Simple programming: The programming of static drive is relatively simple and it is easy to achieve complex display effects.
Disadvantages:
* In the case of a large number of pixels, the number of driving circuits required is large, resulting in increased cost and power consumption.
Scanning drive
Definition:
Scanning drive drives LED pixels by grouping them in rows or columns.
In scanning drive, LED pixels are divided into multiple groups and refreshed row by row or column by column by fast scanning.
The on and off state of each pixel is controlled by the driving circuit in a specific time period.
Working principle:
* Each pixel is activated one by one by time slicing to display a complete image.
Specifically, a row of pixels is selected first, and then the brightness of each pixel in the row is controlled in turn, and finally the next row is selected for the same operation.
Advantages:
* Suitable for large-size display screens: Due to the scanning method, the number of driving circuits can be significantly reduced, making it suitable for large-size display screens.
* Ability to reduce the number of driving circuits: Through time-sharing multiplexing, the circuit requirements are reduced.
* Reduce cost and power consumption: Due to the reduction in the number of driving circuits, the overall cost and power consumption are reduced.
* Support higher brightness and refresh rate: Higher brightness and refresh rate can be achieved through fast scanning and refreshing.
Disadvantages:
* High requirements for driver IC: The driver IC needs to have high performance to support fast scanning and refreshing.
* Due to fast scanning, some details may not be as fine as static drive.
Differences between static drive and scanning drive
| Static driver | Scan driver |
| Driving mode | Each pixel is driven independently | Scanning drive row by row or column by column |
| Circuit requirements | More driving circuits are needed | Reducing circuit requirements by reducing the number of pixels driven simultaneously |
| Cost and power consumption | High cost and high power consumption when the number of pixels is large | Relatively more economical and energy-saving |
| Display effect | High display brightness, good color reproduction, stable image without flicker | May not be as fine as static drive in some details |
| Application scenarios | Suitable for applications with high requirements for brightness and color control, such as large outdoor advertising screens | Suitable for applications with high requirements for refresh rate and number of pins, such as indoor or close-up viewing occasions |