LCD(Liquid Crystal Display)

 

 

Description:

LCD (Liquid Crystal Display) screen is an electronic display module and find a wide range of applications. A 16x2 LCD display is very basic module and is very commonly used in various devices and circuits.
A 16x2 LCD means it can display 16 characters per line and there are 2 such lines. In this LCD each character is displayed in 5x7 pixel matrix

Working Principle:

The liquid crystals used in the LCD are Twisted Nemantic (TN), a type of liquid crystals that are twisted at 90o with the surface. In this state, crystals allow the light to pass through the polarizer but on applying a voltage, they get untwisted and block the light to passing through the polarizer.

The LCD controller in the form of COB IC sends the electric signals to the electrodes which are sandwiched in between the glasses. Electrodes apply the voltage to the corresponding crystals as per the signals received from the ICs. These crystals are then untwisted and blocks the light (from LED strip) making those area darker on the glass. By applying voltage to specific crystals, a desired shape is formed on the LCD.

Features:

• 5 x 8 dots with cursor
• Built-in controller (KS 0066 or Equivalent)
• + 5V power supply (Also available for + 3V)
• 1/16 duty cycle
• B/L to be driven by pin 1, pin 2 or pin 15,
pin 16 or A.K (LED)
• N.V. optional for + 3V power supply

 

Link to datasheet:

https://www.engineersgarage.com/sites/default/files/LCD%2016x2.pdf

 

Pin configuration:

 

⦁ Pin 1(VSS): GND

⦁ Pin 2(VDD): to 5v

⦁ Pin 3 (VEE): to GND through a 1k ohm resistor and to 5v through a 10k ohm resistor

⦁ Pin 4(RS): to Arduino pin 12

⦁ Pin 5(RW: to GND

⦁ Pin 6(E) to  Arduino pin 11

⦁ Pin 7(D0): to any analog or digital pin of arduino

⦁ Pin 8(D1):  to any analog or digital pin of arduino

⦁ PIN 9(D2): to any analog or digital pin of arduino

⦁ Pin10(D3): to any analog or digital pin of arduino

⦁ Pin 11(D4):   to any analog or digital pin of arduino

⦁ Pin 12(D5) :  to any analog or digital pin of arduino

⦁ Pin 13(D6) :  to any analog or digital pin of arduino

⦁ Pin 14 (D7) : to any analog or digital pin of arduino

⦁ Pin 15 to(LEDA):  5v through a 220 ohm resistor

⦁ Pin 16(LEDK):  to GND