Focus LCDs

Resistive touch panels are best for harsh environments. They can handle temperature swings better then capacitive touch.

Here is a TFT with built in Resistive touch panel. <https://focuslcds.com/product/3-5-tft-d ... 8lw6m250-r>

QGVA stands for Quarter VA. it is 320 dots by 240 dots.
Mainly used in monochrome Graphic displays.

The two types of backlights that generate EMI or noise or interferance are: EL (Electroluminescence) and CCFL. Both of these have been phased out on monochrome displays such as: Segment, Character and Graphics. The main reason they have gone away is that they are AC driven which creates noise and ha...

Half-life is the amount of time before the LED (LED backlight) will be half or 50% as bright as when it was first turned on. This is not the amount of time for it to burn out. Standard half-lilfes for LEDs range from 50K hours to 70K hours. The lower the current, the longer the half-life. EL backlig...

It is very difficult to order any display with a CCFL backlight. CCFL ( cold-cathode fluorescent lamps backlights) have been discontinued for a few reasons. The main one is that they are hard on the environment. Also, they have a short life time and use AC power which generates noise. We do not reco...

The best LCD technology for any handheld product is one that uses very little power so that batteries can last a long time. Displays with the lowest power requirements are ones without a backlight, since the backlight can draw 10X more power than just the LCD. Examples of these include: Character, m...

The majority of TFTs have a transmissive polarizer that provides a bright backlight, but does not perform well in direct sunlight.
The best option is to increase the brightness of the display to 700 nits or brighter. A nit is the amount of light produced by one candle.

The best type of display for direct sun light is a monochrome display with a reflective polarizer. 100% of the sunlight is reflected and makes it easy to read the display.

There is no standard 2" TFT. The two closest sizes are a 1.8" and a 2.4"

The tooling cost (or NRE) to custom build a TFT runs over $100K and has high MOQs. it is not a good option for most designs by OEMs.

LED backlights, as used on Character, Segment and graphic displays, are measured in half-life. The half-life is how many hours it is on before it is half as bright or at 50% brightness. The lower the driving current of the LED backlight, the longer the half life. Halflife is not the amount of time b...