Frequently asked questions
Q: Do I need to refresh the display content permanently? What speed should my micro controller have for this and how much memory for the display?
A: Our modules includes the display with the display RAM! You just send the data to be displayed to the module once - the module takes care about refreshing etc. The speed of your micro controller is not important, also the memory as you do need separate display RAM.
Q: May I mix text and graphics as I want?
A: Yes, you have full control of every single pixel. Our software routines helps you to write your data to the display in a comfortable way. You may mix text and graphics like you want - there are no limitations!
Q: How fast is the display?
A: The display is pretty fast - but still limited as of the serial communication. It cannot be used for showing video files but is fast enough for any other usage.
The clock cycle of the display may be up to 13 MHz - this makes theoratically (your microcontroller need to be really fast) a frame rate of 90 per second.
Practically you will not reach this as your microcontroller is too slow. Depending on your system and used compiler you may transfer / display 2-10 full screen pictures (=17 KBytes) a second (e.g. photos or videos). As you usually change only these parts of the screen which has been changed (thanks for the display RAM) you have to transfer only these data - all the other remain unchanged and does not need to be transferred again. By doing it this way you may update critical data on the screen 20-100 times a second. Usually this is too much and does take processor time. A good idea is to call a display routine once or twice a second where all needed display data are transferred. Example: to change the displayed number “120” to “231” you just need to transfer 20-30 bytes which you are able to do a few thousand times a second if you want. So, speed is usually no limitation.
Q: I understand that the signals from my microcontroller may have 2,5 up to 15 Volt - independet of the voltage used for the display module. Is this correct?
A: Exactly - you do not have to take care of this. The signals of your microcontroller are 100% decoupled of the voltage of the display module. Just connect it, no matter what voltage you are using.
Q: Do I need to pay any license fee if I want to integrate your software into my commercial product?
A: Well, we do have the copyright on the software and the documentation but we do not want you to pay anything extra. You are allowed to integrate this into any project you want. There is only one exception: You shall not offer anybody the source code of this - as long as you ship compiled code we do not mind. Of course it is not allowed to give away our documentation in any way to others.
Q: May I purchase the display only including the small connector?
A: Sure, you may both purchase through our shop. But we would advise you strongly to buy one of the modules first. You then know you have a tested, running system and you will bypass an eventually long and difficult search for bugs. Why?
a) The display is very sensitive and just a small difference in the needed voltage etc. results in a non predictive behavior.
b) The contacts at the connector are very very tiny. You will need special equipment to be able to solder them.
Q: Is it really easy to convert your code to my system or to a different programming language?
A: Yes, we did not use any special commands to make it easy to port the code. Even a beginner will be able to convert the code to another language.