When selecting a LCD with backlight, there are two types of LCD polarizers to consider: Transflective vs Transmissive.
Transflective vs Transmissive | Which is Best?
|Transmissive polarizer:||Transflective Polarizer:|
Transflective vs Transmissive Visual Aid:
Below are two photos comparing a Transmissive polarizer to a Transflective polarizer.
These segment displays (below) are shown in different color backlight options. They are built with the same LED backlight and driven at the same current. In all photos below the transmissive polarizer is on the left side and the transflective polarizer is on the right side. As you can see the display with the Transmissive polarizer is brighter.
All Photos are Positive mode. For more information on Positive mode LCD module and Negative mode LCD displays, please see Positive-and-negative-mode-lcd-display-modules/.
Which polarizer to choose?
Transflective vs Transmissive… The choice is simple. If your product is battery powered or you need it to be readable in direct sunlight, then choose Transflective; otherwise choose Transmissive.
There is no difference in cost or lead-time between LCDs with a Transflective and Transmissive LCD polarizer.
Note: There is a third polarizer option: Reflective and is covered in the article : what-is-the-difference-between-reflective-transflective-and-transmissive
Once you choose the polarizer type (Transflective vs Transmissive), you will need to select the type of backlight. There are two technologies: LED vs EL.
- LED (Light-Emitting Diode) is the most popular and accounts for about 98% of all new LCDs that require a backlight.
- LEDs are DC driven with a half-life ranging from 50K to 80K hours depending on how hard they are driven.
- EL (Electroluminescence) backlights are available, but not recommended for new designs.
This type of backlight is being phased out due to several reasons including:
- A short half-life of only 3K hours
- They are AC driven which requires an inverter and produces electrical interference. (aka noise)
- MOQs (Minimum Order Quantities) are much higher.
What does half-life mean?
‘Half-life’ is a way to measure when the brightness of a backlight is half (50%) as bright as when it was first turned on and is measured in hours. This is not the amount of time for the backlight to burn out.
Questions about LCDs?
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