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LIQUID CRYSTAL DISPLAYS and LCMs.

Liquid Crystal Displays (LCDs) are a passive type of displays. This means they do not emit light; instead, they use the ambient or additional light of the environment. By manipulating the external light, they display images using very little power, compared to any other display device in the market. This has made LCDs the preferred technology whenever low power consumption and compact size are critical..

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LCD Modules or LCMs.

LCD modules are LCD display units packaged into an electronic module that can communicate with customer's system using basic serial or parallel interface.

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TYPES OF LCDs.

TN -Twisted Nematic, STN-Super Twisted Nematic type of L C Ds

A TN-Twisted Nematic LCDs will have the Liquid crystals with a twist of 900 between the two polarization plates.

TN type of LCDs are normally very economical, will have Limited viewing angle, quick response time for change in the electric field and can handle only limited segments in the display because of a limited in the level of multiplexing the display segments.

Where as a STN-Super Twisted Nematic LCD will have the Liquid crystals twisting from 1800 to 2700, in the charged condition. STN type will be relatively expensive, will have wider viewing angle, Will response relatively slower, but can have very high number of display segments as it can have a high level of multiplexing.

 

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Transmissive LCD

A transmissive type of LCD is illuminated from one side and viewed from the opposite side. Activated segments will appear dark while remaining dispolay area will appear bright. The additional lamp used to illuminate the LCD will consume very high battery power than the LCD itself.

 

Transmissive LCD

A reflector layer is provided in the rear side of the Display. The display details will be viewed by the ambient light reflected by the mirror. This display has a relatively lower contrast, because the ambient light passes twice through the unit before reaching the viewer. The advantage of this type is that there is no lamp to consume power, so the battery life is long. Hence, the LCD consumes so little power that it can operate from a photovoltaic cell also.

 

Transflective LCD

Transflective LCDs use a combination of transmissive and reflective modes. These displays are mostly used in places where the viewing is required in both bright and dark surroundings. Additional light source called "Back light" is provided which will be selected if surrounding is dark. Power consumed by this type of display, will be higher whenever the Backlight is used and will be minimum when the backlight illumination is not used.

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Viewing angle of LCDs

Viewing angle is the angle preferred to view the display segments clearly. All Liquid Crystal Displays will have a designed viewing angle.

  •  12.00-Hour viewing angle is in display units where the LCD is below the head level of the viewer, like that of display in calculators.

  • 6.00-Hour viewing angle is in display units where the LCD is above the head level of the viewer, like that of watches and clocks,.

  • Other viewing angle like 3.00 position and 9.00 hour position is selectively used in some specific applications, where the display will be viewed when the viewer is positioned either to the Right or Left of the display Unit, respectively.

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Display systems

Segment system

Long display units are arranged to form a figure '8' to display numbers.

 

Dot matrix system

Display units are arranged in rows and columns to form character

 

Pictures, Icons, Symbols or Letters.

Geometrically definable details can also be provided in LCD displays. Any combination of the above type of display details can be provided as per any specific requirement of the customers.


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Types of connectors used.

Pin connectors, Heat seal connectors or Elastomer or Zebra connectors, each of which has specific reasons behind the choice, can connect LCD displays to the PCBs to establish electrical connection with the driver circuit assembly. We can provide any of the three options, to suit customer requirements.

We at Konarak Industria Pvt Ltd., are capable of manufacturing of any type of the LCD displays detailed above, images of some of the display units, which are presently supplied to some customers regularly is provided. We assure a competitive display solution for any of our customers.

Please contact Konarak Industria Pvt Ltd., with your specific requirements and on the basis of sound technical expertise in the design and development of LCD and LCM, your specific LCD Display requirement will be met with optimum solution.

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