LCD Display Types and Technologies
LCD Display Types
Brief overview on how an LCD works?
LCD Display Technologies
LCD Display Types
Brief overview on how an LCD works?
Reflective Type
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Light Source
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Environment
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External Light
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Generally used in bright ambient light conditions
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Transflective Type
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External light and backlight display
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Can be used as reflective type when light is
bright, and as transmissive type when light is poor
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Transmissive Type
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Backlight display
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Used with backlight for low and no ambient light
conditions
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LCD Display Technologies
TN Type
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Twisted Nematic (TN) LCD – In a quiescent state, display has a 90°
twist in the alignment of the liquid crystal molecules at the transition
between the surfaces of the two glass substrates. Polarizers are attached to
the outer surface of the substrates which are oriented to allow light to pass
through the display. When activated selectively by an electric field, the
activated segments align to the field and no longer twist light passing
through the display creating a contrast between on and off states.
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Colour Mode
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Dot Colour
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Background
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Structure
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Grey
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Black
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Grey
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STN Type
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Super Twist Nematic LCD (STN) – The
structure of STN is similar to TN but with 180 to 270 twist. The higher twist
gives better contrast and viewing angle for highly multiplexed applications.
STN LCDs normally have a yellow/green or grey background that is due to the
optical effect called birefringence that changes the polarization to
elliptical rather than linear polarization.
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Colour Mode
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Dot Colour
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Background
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Structure
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Yellow/Green
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Dark Blue
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Yellow/Green
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Light Grey
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Dark Blue
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Light Grey
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Blue
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White
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Blue
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FSTN Type
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Film Compensated Super Twist Nematic
LCD (FSTN) – This display uses an optical retarder to eliminate elliptical
polarization from STN display. It removes the birefringence effects and
results in a black and white display.
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Colour Mode
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Dot Colour
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Background
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Structure
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Black & White
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Black
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White
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FFSTN Type
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Double Film Compensated Super Twist
Nematic LCD (FSTN) – This display type is the same as the FSTN, the only
difference is that it has double the compensation film. This creates a better
resolution and a deeper black. FFSTN has the highest contrast and viewing
angle for high multiplexed LCD’s.
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Colour Mode
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Dot Colour
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Background
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Structure
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Black & White
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Black
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White
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