The applications of LCD displays

The applications of LCD displays

The LCD screen includes a TFT display and a monochrome screen.

And they are used in a wide range of applications in our daily lives, such as the military, aerospace, medical, transportation, and general civilian consumption. We have a hard time finding an exhaustive list of product applications on the web. So next join me in summarizing what products LCD screens are used for.

The first is the military field:

Common electronic devices with LCD displays used by the military include military computers,

military computer

and then on walkie-talkies

walkie talkie

thermal imaging devices

thermal imaging devices

night vision devices, laser range finders, etc.


Next is the aerospace field:

computers, all kinds of similar machinery, aircraft cockpit dashboards

aircraft cockpit dashboards

TVs behind passenger seats.

Then medical field:

X-ray machines

CT scanners

CT scanners, various types of counters, biochemical and immunoassay instruments, fiber endoscopes, laser therapy machines

laser therapy machines

blood cell analyzers, differentiation analyzers, enzymes, plate washers, urine analyzers, ultrasound machines (color ultrasound, B ultrasound, etc.), X-ray machines, MRI machines, sphygmomanometers, electronic thermometers, multifunctional therapy machines, laser therapy machines, glucose meters

blood cell analyzers

diabetes treatment machines, etc.


Then the transportation field:

let’s start with the cars themselves (various cars such as motorcycles, electric cars, bicycles, etc. are included here) The products that are useful to LCD display are: car dashboard

car dashboard

car navigator

car navigator

charging stake, motorcycle yard meter, bike yard meter

bike yard meter

mechanical gas cylinders, pressure gauges, gas gauges, car chargers, motorcycle gauges, car cigarette lighters, tire pressure gauges, electric car charging guns.


Next up is the office sector:

There are printers, money readers

money reader

time and attendance machines, access control systems, surveillance systems, scanners


fax machines, and if you include banking systems, then there are also: POS machines

pos machine

bank cards with displays

bank cards with display

U-shield, pager machines, etc.


The last category is also the largest:

it includes a wide variety of consumer electronics, with no less than 10,000 kinds, and here we will only introduce the ones that everyone has seen and knows.
For example



air conditioner

air conditioner

washing machine, electric fan, pressure cooker,

water heater

water heater

rice cooker

gas display meter

pressure gauges

electric meter, thermometer, foreheat gun, calculator, digital cameras, blood glucose meter, weight scale, coffee maker, smart water cup, mobile power, hand ring, clock (alarm clock), U disk, helmet, car logger, Bluetooth speaker, endoscope, air conditioner remote control, thermometer, radio, VCD, DVD, home theater, air monitor, dog trainer, egg incubator, juicer, ultrasonic weight loss meter



point reading pen, film scanner, digital camera charger, coin storage tank, smart water cup, smart shaver, manicure meter, baby monitor, headset, microwave oven, router, timer, rangefinder, speedometer, running headset headband, various IC card phone, Internet phone, IP phone, landline, senior machine, BB machine, intercom, wireless phone.

Features of the LCD display

A. Low voltage drive.

B. Low current consumption.

C. Small in size, light in weight, getting thinner and thinner.

D. All sizes and areas are available.

E. Proven technology, low cost.

F. Large viewing angle for full view.

G. Use is greatly limited by temperature.

H. Need an external backlight.

Professional terminology related to LCD

Professional terminology related to LCD

LCD: (LIQUID CRYSTAL DISPLAY) Liquid Crystal Display


TN: (TWISTED NEMATIC) Distorted directional column. Liquid crystal molecules distort their orientation by 90°.

STN: (SUPER TWISTED NEMATIC) Super Twisted Nematic Column. Approx. 180-270°


TN (Twist Nematic)

SBE (Super-twisted Birefringence Effect)

ECB (Electrically Controlled Birefringence)

FLC (Ferroelectric Liquid Crystal)


UFB: Ultra Fine Brightness

UFC: Ultra Fine Contrast

FSTN (FORMULATED SUPER TWISTED NEMATIC) Formatted super twisted vector columns. On the first floor, there is an optical range compensator added to the STN for a monochrome display.

TFT: (thin-film transistor)

BLACK LIGHT: Backlight

INVERTER: Inverter

OSD: (ON SCREEN DISPLAY) Displayed on the screen


TMDS: (transaction minimized differential signing)

LVDS: (Low Voltage Differential Signaling)

IC: Integrated Circuit (INTEGRATE CIRCUIT)

TCP: (TAPE CARRIER PACKAGE) flexible circuit board

COB: (CHIP ON BOARD) secures the IC die to the board by binding

COF: (CHIP ON FPC) secures the IC to the flexible circuit board.

COG: (CHIP ON GLASS) to hold the chip to the glass

DUTY: Duty cycle ratio, the proportion of the portion of a cycle above the lit threshold voltage

LED: (Light Emitting Diode)

EL: (ELECTRO LUMINESCENCE) Electroluminescence. el layer consisting of high molecular weight sheets


PDP: (PLASMA DISPLAY PANEL) plasma display

CRT: Cathode ray tube (CATHODE RADIAL TUBE)

VGA: (VIDEO GRAPHIC ARRAY) video graphics array

PCB: (PRINTED CIRCUIT BOARD) Printed Circuit Board

S-VIDEO: S terminal, with composite video signal ratio, transmits contrast and color separately

NTSC: (National Telecommunications Systems Committee)


VOD: (VIDEO ON DEMAND) video on demand

DPI: (DOT PER INCH) points per inch

History of Liquid Crystal

1. A brief history of the liquid crystal


A. Discovery phase

It was discovered in 1888 by Austrian botanist F. Reinitzer


In 1889, it was named “Liquid Crystal” by the German physicist Otto Lehmann.

Otto Lehmann

B. Stage of development

In 1963, the U.S. company RCA made a proposal to apply liquid crystal to the display.

1969, Synthetic Ambient Liquid Crystal (MBBA).

C. Application phase

In 1973, clocks, desktops appeared.

In 1979, game consoles, 1-6mm card motors appeared.

In 1982, detectors appeared.

1984, applied to 2inch TFT color LCD TVs.

1986, applied to the STN typewriter.

1988, for 3-14inch TFT color LCD TVs.

1989, applied to 100inch color LCD TV, laptop.

1990, applied to a 10inch color LCD laptop.

In 1994, 21 inch TFT was put into trial production (Sharp). 14-inch color STN LCD was put into trial production.

Now: LCD technology has seen unprecedented development and widespread application.

2. Types of liquid crystal


A. Status of liquid crystal

Liquid crystal is a substance between a liquid and a solid, which develops between the liquid phase and the solid phase with temperature change.

The main structure is the intermediate part of the benzene ring with -CN, -F, attached at both ends.

B. Molecular structure of liquid crystals

Molecular Structure of liquid crystals

Molecular structure of liquid crystals

 C. Types of liquid crystal

There are three states of the existing LCD, and the current LCD is mainly used in the Nematic state.

types of liquid ctrystals

I. Nematic phase liquid crystals

Nematic molecular species have a disordered center of gravity that allows them to behave like ordinary liquids flowing, but the pointing vectors of the molecular rods are roughly the same.

II. Intra-crystalline liquid crystal

Smectic LC molecules form a layer-by-layer structure with a molecular layer thickness of approximately one. The length of a molecule; the molecules are arranged perpendicular to the plane of the molecular layer and the center of gravity of the molecule is disordered in the molecular layer of, forming a layer of two-dimensional fluid.

III. Cholesteric liquid crystals

The gravity arrangement of Cholesteric molecules is disordered, but the molecules point at a vector. The plane is roughly pointing in one direction. In the direction perpendicular to this plane, the molecule’s pointing vector. It rotates the spiral structure of the stroke.