Reflective vs. transflective vs. transmissive Dispaly

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Henry
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Reflective vs. transflective vs. transmissive Dispaly

Post by Henry » Fri Apr 17, 2020 1:44 pm

A quick guide on the different ways to illuminate LCD and TFT displays.

Reflective

A reflective display has no backlight, and uses ambient light to self-illuminate. Light passes through the glass and is reflected back out.
Reflective LCD
Reflective LCD
reflective.png (172.15 KiB) Viewed 1626 times

Pro:
  • Low power application
  • Works great in direct sunlight
Con:
  • Poor readability in low light conditions
Transmissive

Most TFT displays and negative LCD’s are transmissive. A negative LCD is where the characters are the colour of the backlight. The backlight is used to illuminate the display, If the backlight is off, the display will generally not be readable. The backlight fights against ambient light, so in direct sun, a backlight that is sunlight rated is required or the display will become washed out.
Transmissive LCD
Transmissive LCD
transmissive.png (136.5 KiB) Viewed 1626 times
TFT On/Off
TFT On/Off
Sub-Q-6.jpg (151.58 KiB) Viewed 1626 times


Pro:
  • Cost effective
  • High availability
Con:
  • In outdoor applications where ambient light is high or in direct sunlight

Transflective

Transflective LCD’s and TFT’s have both reflective and transmissive characteristics. The display will use ambient light as well as a backlight. An example is a yellow/green backlit LCD. Very few TFT display are offered in transflective.
Transflective LCD
Transflective LCD
transflective.png (144.46 KiB) Viewed 1626 times

Pro:
  • Direct sunlight and flexibility in application
Con:
  • Hight cost and availability in TFT
Henry J.
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Matrix Orbital

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