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TN (Twisted Nematic) Mode LCD
TN (Twisted Nematic)
  • This is the abbreviation of Twisted Nematic field effect mode. This is the mode which arranges the liquid crystal molecules by controlling their movement with electric voltage (electric field) so as to twist them by 90° in the through the polarizer placed on the two upper lower plate of LCD by controlling the movement of the liquid crystal molecules.
STN (Super Twisted Nematic) Mode LCD
STN(Super Twisted Nematic)
  • This is the abbreviation of Super Twisted Nematic field effect mode. While the TN mode arrange the liquid crystal molecules by twisting them by 90°, the STN mode arrange them by giving a still larger twist and provides display by birefringence effect of liquid crystal.
Bistable LCD
  • Something that is bistable can be resting in two states. In physics, for an ensemble of particles, the bistability comes from the fact that its free energy has three critical points. Two of them are minima and the last is a maximum. By mathematical arguments, the maximum must lie between the two minima. By default, the system state will be in either of the minima states, because that corresponds to the state of lowest energy. The maximum can be visualised as a barrier.

    A transition from one state of minimal free energy requires some form of activation energy to penetrate the barrier (compare activation energy and Arrhenius equation for the chemical case.) After the barrier has been reached, the system will relax into the next state of lowest energy again. The time it takes is usually attributed the relaxation time. (There might be uncertainty as to which state will be the new one, but it is often well defined in the situation.)

    Optical bistability is an attribute of certain optical devices where two resonant transmissions states are possible and stable, dependent on the input.


Balls marked '1' and '3' are in the two stable positions
  • Application: E-Book, E-Tag
COB (Chip On Board
  • 1. Bare die direct attachment to PCB
  • 2. Multiple chips can be bounded on the same board for compact system
  • 3. Flexible design for connection
  • 4. Suitable for low to medium pin count IC (< 200 pins)
TAB (Tape Automated Bonding)
TAB (Tape Automated Bonding)
  • 1. Direct connection to glass using ACF or indirect connection using heat seal cable
  • 2. Compact and light weight TAB design optimized for handheld products
  • 3. Bendable for flexible design
  • 4. Final tested before shipment for promising manufacturing yield
  • 5. Suitable for hight pin count IC (> 200 pins) with fine pad pitch
COG (Chip On Glass
COG (Chip On Glass
  • 1. Au bump slim die direct attachment to glass using ACF
  • 2. Best fit for mobile communication products that require very small and thin LCD module
  • 3. Integrated features on chip to minimize external components
  • 4. Suitable for high pin count IC (> 200 pins) with fine pad pitch
Touch-Key Panel
Touch-Key Panel
  • The Touch-Key panel consists of an array of transparent electrodes formed on a glass film transparent board. A Finger tip or pen-point touch on the panel caused the upper and lower electrode to contact.