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The world of Liquid Crystal Displays can be confusing. What is a STN display, what does reflective mean, etc. There are many terms, and possible configurations that it can be daunting just trying to figure it out.

We hope that this section will help to answer your most common questions.  If you did not find your answers here, you can still contact our technical specialists at support@411techsystems.com. or check our other FAQ section.

FAQ’s

What does STN stand for?
Why are there different polarization types?
Do your character LCD module have the HD44780 controller built-in?
Can I change the backlight type from EL to LED?
I have a reflective type LCD and I want to put a backlight behind it, I see that there is room for an EL type, what do I need to do?
Do I need to add a current limiting resistor for the LED backlight?
We like your Serial board and would like to use it for mass production, can you send us the schematic and associated firmware?


What does STN stand for?
STN stand for Standard Twisted nematic and this is a fluid configuration.  What this means is the Liquid crystal has a great twist than the Twisted Nematic, which improves your contrast ratio as well as your viewing angles.  For more information follow this link to our Fluid Types Tutorial.

Why are there different polarization types?
Some polarization are designed to work in specific environments, whereas others will not be as effective.  There is one common polarization that will typically work in most environments. Follow this link to our Polarization Tutorial.

Do your character LCD module have the HD44780 controller built-in?
Our Character type LCDs have either the HD44780 or its equivalent. Hitachi stopped producing the HD44780 some years ago and the shortage of this IC was picked up by manufacturers like Samsung. The HD44780 equivalent controller is fully compatible with the Hitachi HD44780. Some minor timing adjustments may be necessary, but for the most part you may not need to change anything.

Can I change the backlight type from EL to LED?
Mostly likely you cannot migrate from the EL to the LED. The first problem is the thickness of the module will increase due the LED backlight requirement for a lightguide.  This means that the air gap between the LCDP and the PWB will need to increase from the current EL.  For more information on backlight types, follow this link to our Backlight Tutorial.

I have a reflective type LCD and I want to put a backlight behind it, I see that there is room for an EL type, what do I need to do?
For starters, on reflective type LCD’s you cannot backlight the display. The problem is because the polarizer will not allow any light to pass from the back, it will not allow you to put any backlight...even if there is a gap behind the display.

Do I need to add a current limiting resistor for the LED backlight?
YES! To ensure that you do not burn out the LED’s, its a good idea to have a current limiting resistor.  A value of between 10~20ohms is good. You can adjust the resistance to suit your brightness needs.

We like your Serial board and would like to use it for mass production, can you send us the schematic and associated firmware?
To use our serial board for mass production, please contact our legal department at legal@411techsystems.com to discuss licensing agreements.  We are more than happy to share our product designs with your company.

 

 

 

 

 

 

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