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Saturday, October 20, 2018

Liquid Crystal Displays

Definition of Terms

Construction

Display Off

Display On

Principle of operation of a twisted nematic
(TN) display

Transmission versus voltage characteristic
of a twisted nematic (TN) display

Operating Voltage and Frequency

Vop: Operating Voltage
(Voltage between electrodes)
Fop: Operating frequency
Operating voltage waveform: AC square wave

Contrast (C)

 

 
Vop: Operating Voltage

Optical Response Time

NOTE:measured by transmitted light

Vop:  Operating Voltage (V) 
Fop:  Operating Frequency (Hz) 
Ton:  Response time (rise)
Toff: Response time (fall)

Measurement Direction

Viewing Angle

Measurement Direction & Viewing Angle

Measurement Direction

Viewing Angle

Types of Displays

Positive 

Ambient or backlit

Negative 

Backlighting required

Lighting Methods

Reflective
Ambient light required

Transflective
Ambient light or backlight

Transmissive
Backlight required

Connector and Mounting Method

RUBBER CONNECTOR (ELASTOMERIC)

Structure
Alternative lamination of conducting rubber and insulated rubber
Connecting Method
Mechanical compression
Pitch (mm)
Min 0.4
  • Easy to assemble
  • Adopted for many years
  • Applicable even to narrow pads
  • Printed circuit board need gold plate or graphite coating
PINNED CONNECTOR, DIL
Structure
Metal pins fit onto the Panel terminal pad
Connecting Method
Soldering
Pitch (mm)
Min 1.8, 2.0, 2.54
  • Suitable for small production runs

FLEXIBLE CONNECTOR (Heat Seal)

Structure
Film with electroconductive thin film or printed graphc
Connecting Method
Heat and pressure fitting, soldering or mechanical compression
Pitch (mm).
Heat Seal: Min 0.4
Soldering type: Min 0.8
  • A thin structure can be achieved
  • Flexible
  • Trimmable length
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