As you drive through the streets of the city, look around and you'll see more and more full-color LED signs and message boards appearing on the walls of shops, restaurants and office buildings. With the rapid growth in the production of LED matrix display systems, advertising signage now offers affordable prices for store owners. To support this need, we are working hard to develop new technologies to further optimize the LED drivers that can implement these displays.
Earlier this year, TI introduced the industry's first 48-output (48-channel) LED signage display driver product line. The TLC5954, TLC5955, and TLC5958 provide three levels of integration to support varying degrees of flexibility.
So why do you need 48 sets of output? In the current LED signage market, 16 output drivers are used the most. At TI, TI TLC5920 is an example. As a result, devices with 48 sets of outputs are three times the number of channels for a typical 16-output device, but more outputs will support red, green, and blue (RGB) LEDs in full-color signage applications.
In a typical LED display system design, one module contains 16 &TImes; 16 pixels (see "LED Signage Terminology") and 3 16-channel devices required to drive:
IC1: 16 × 16, red
IC2: 16 × 16, green
IC3: 16 × 16, blue
When comparing the use of three 16-output devices to a 48-output device, the obvious advantage is that the latter has a higher level of integration, reducing the number of driver ICs on the PCB by a factor of three. This simplifies the PCB layout.
The following is a comparison of the normal LED layout with three 16-output drivers versus the same layout with one 48-output driver. In the upper half of each figure there are 256 (= 16 × 16) RGB 3 in 1 LEDs, equivalent to 768 individual LEDs. The use of a 48-channel driver significantly simplifies the design, eliminating the need for line jumpers.
3 16-channel LED driver ICs
Single 48-Channel LED Driver IC
For example, let's take a look at TI Design with the 48-channel TLC5958. In this example, the 4-layer board has a 64 × 64 pixel matrix design that is 16 times larger than the above example, for a total of 12,288 LEDs.
When you consider these 48-channel drivers in your next design, here are some of the information you need to help you choose the right device for your system. In addition, you can watch the video "The Industry's First 48-Channel LED Display Driver Series."
The TLC5954 LED driver is the easiest to use, not only integrates brightness control, but also provides a high degree of flexibility through software. It does not have integrated PWM generation logic, but includes long shift registers that directly control the output stage switches. To drive the TLC5954, a powerful processor (FPGA, DSP, and/or ASIC) is required to send switch data to the shift register. The advantage of the TLC5954 is that the software code can do whatever you want with the processor. For example, you can implement complex and sophisticated spread spectrum PWM signal control to avoid or minimize EMI problems.
The TLC5955 LED driver is at the middle of these three devices in terms of integration and flexibility. The device integrates proven ES-PWM control, allowing the driver to be controlled with a lower power processor.
The third device in the 48-channel LED display driver family is the highly integrated TLC5958. It integrates 48Kb RAM and supports up to 32x time division multiplexing control. This multiplexing technique reduces the number of driver ICs on the PCB. Without integrated RAM, it is difficult to achieve high quality video output images because the time gap is too short. In addition, the TLC5958 integrates pre-charge FETs and low grayscale enhancements, making it ideal for high-power time-division multiplexed display systems.
I hope that you will try these latest 48-channel drivers when designing your next signage. Click here for information on all of TI's LED display drivers. Please tell me your usage!
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