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Technical Library |
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Text Messaging |
Bi-stable Cholesteric technology is truly unique in that it doesn’t require any
power to drive the display. The image is retained after power-off. No polarizer or backlight
is needed, and power is only necessary when the information is refreshed. This makes it perfect
for applications such as signage, shelf labelling, e-books and USB memory sticks where updating
is less frequent. As well as no power consumption, BCD contrast also improves in light and is
available in many colour combinations.
In a normal monostable LCD a layer of liquid crystal material is sandwiched between two glass
or plastic substrates across which a voltage is applied independently to each pixel of the
display. This applied electric field may alter the molecular configuration of the liquid crystal
and thus alter the optical characteristics of the display. With the aid of optical filters this
can enable the device to switch between a light and a dark state. When the voltage is removed the
device switches back to its original and only stable state.
The construction of a bistable LCD is similar to that of a monostable LCD. However, in contrast
to the monostable LCD, in a bistable device the two molecular configurations relating to the
light and dark states are locally stable when the voltage is removed. Therefore, power is only
needed to switch from one state to the other. For electronic devices in which the image or parts
of the image remain in a fixed state for some time, this would dramatically reduce the power
consumption of the device.
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Our main application for bi-stable screens is text messaging. This function allows any person
within the WLAN who has a text-enabled module, to communicate with any other such module.
Other applications include sensor read-outs for temperature, water flow, or virtually any
sensor application that requires a visual indication of the operating conditions. Some LCD
modules may be only able to read the message and respond with a programmed set of responses.
The reduced energy consumption of the bi-stable technology, allows
our batteries to last for much longer than other LCD technologies.
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The bi-stable LCD screens offer high resolution (VGA, SVGA, XVGA or >), wide viewing angles
and operating temperatures, and exceptional sunlight readability. It is possible to
link up with cell or satellite providers to continue the text-messaging function, once
outside of the WLAN.
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Bi-Stable LCD Information Links
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Bi-Stable LCD Manufacturer Links
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request a change or addition
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