led display scan mode
Two types of Scan modes:
1. Static scanning:
Static scanning is to implement “point-to-point” control from the output of the driver IC to the pixels.
2. Dynamic scanning:
Dynamic scanning is to implement “point-to-column” control from the output of the driver IC to the pixel points.
Static: A single-driver IC has 16 pins and can drive a maximum of 16 LED chips. In static drive mode, all LEDs on the LED module can be driven by the IC simultaneously, as illustrated in the following image.
1/2 Scan: In 1/2 scan mode, the IC drives a set of 1/2 LEDs on the module at a time, and subsequently switches to another set of 1/2 LEDs.
1/4 scan: 1/4 of LEDs on the module are driven by IC at one time, and next time there are other 1/4 LEDs that are driven.
Module size:300×168.75mm; pixel resolution: 160×90=14,400 dots.
Each LED contains 3 color chips(1R1G1B), so there is a total of 14,400×3=43,200 colors in one led module.
with 1/45 scan driving mode. only 43,200/45 =960 colors are required to be lit up each time.
Since each Driving IC has 16 pins. so the total amount of Driving ICs required for one module is 960/16 = 60 pcs (2o pcs for Red color;20 pcs for Green Color;20 pcs for Blue color)
Why is Dynamic driving mode essential?
A static driver design (P1.875) would require 2700 16-channel driver ICs and current setting resistors. That will lead to an increased number of PCB layers and costs, on the other hand, the brightness is much higher but the current is also too high.
A dynamic driving mode design utilizes a single driver IC to activate more LEDs, conserving space on the PCB board and optimizing the budget and driver IC’s layout. However, when aiming for high image quality, there is a trade-off between high grayscale and high scan rate. As a result, a smaller pitch necessitates more time-multiplexing in the design. Typically, P2.5 displays implement a 1:16 time-multiplexing design, whereas displays with a pitch of 2 mm and below require time-multiplexing above 1:16.
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