Abstract
We present the design of a 320x256 RGB LED electronic display board intended to be used as a platform to present information of current and future events in schools or office buildings. The proposed design can display up to eight different images, which may include text and graphics. The rendering of these images is done periodically, with the duration of the period being controlled by the user. The images can be created from slides of a power point presentation or directly from stored photos. Loading of new images to the display board is done wirelessly via WiFi from an Android App running on a portable device such as a tablet or a smartphone. We present experimental results on a completed and fully operational prototype system, which includes the RGB LED display board together with the custom-built microcontroller board as well as the Android App. While the current use-application is as an informative message board in a school set-up, the proposed system can be used in any other indoor application. For outdoor usage, the system would require an additional weather-proof enclosure and fixtures.
Highlights
IntroductionSimpler and more traditional, one can find the systems that use character LCD displays with two or more rows and 10, 20 or other number of characters per row, such as the 16x2 character LCD [1]
There are generally three main categories of electronic displays
Such studies are outside the scope of our paper, which focuses on the system integration design aspects, both hardware and software, and prototyping of large RGB LED displays
Summary
Simpler and more traditional, one can find the systems that use character LCD displays with two or more rows and 10, 20 or other number of characters per row, such as the 16x2 character LCD [1] This type of display can typically display static or moving text messages [2]. In the third category, we can find RGB LED displays Examples in this category include mostly outdoor scoreboard displays as well as highway and business side billboards. The advantages of RGB LED displays compared to the color LCD displays include better visibility in sunlight conditions, better contrast for crisper details, purer colors, and reduced reflection. Their power consumption is typically large and their cost relatively high. While most of these example designs are controlled by microcontrollers, there are solutions that use field programmable gate arrays (FPGAs) as well for improved speeds [7]
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