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Color STN has a color filter over FSTN. Light, transmitted by the
backlight, needs to through the color filter.
CCFL (Cold Cathode Fluorescent Lamp) and LED (Light Emitting
Diode) are used as a backlight. LCD is made of a cell that contains
liquid crystal material sandwiched between two glass plates. Lines
and columns of the transparent conductor are configured on the inner
surfaces of the cell. A transparent polarizing film is attach-ed
to the top glass plate. Pre-tilted angle is to twist LC for the
direction. LCD is classified by difference in twist angle, TN and
STN. A gray scale scheme is applied to control the transmittance
of R.G.B. pixels on color filter. By the different proportion of
R.G.B. elements, we can get many kinds of color. Additionally, due
to optical compensation properties of retardation film, we can get
higher contrast and wider viewing angle on the display.
The Transflective color LCD has a weak point in that it can't express
the image in the dark area. To over-come such a weakness, EVERVISION has
developed several technical methods. In the dark area, The Trans-flective
type uses a Backlight and in the light area expresses an image without
Backlight. |
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