What is an LCD Display?

In today's daily life
The Internet has become a part of life
Away from your phone and computer
There will be much less joy in life

The screen serves as a carrier for sharing fun on the Internet
It has been widely used in various products
From large to small
Various kinds
The whole nine yards
Children's phone watches
Carry your phone with you
Tablet for work and office
A giant screen full of technology

...............

Although we use it a lot
But the screen is also divided into many types
The experience of adapting to different screens is also different
Today, I will tell you about Xiaozhan
What is LCD (Liquid Crystal Display)

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Origin

      LCD (full name is Liquid Crystal Display). At the end of the 19th century, an Austrian botanist discovered liquid crystals, a substance that combines the fluidity of a liquid with the arrangement of crystals. Under the action of electricity, the arrangement of liquid crystal molecules will change, affecting its optical properties, a phenomenon that the scientific community calls the electro-optical effect. 
     British scientists relied on this principle to create the first liquid crystal display, the LCD, in the last century. The world's first liquid crystal display device appeared in the early 70s of the 20th century, known as TN-LCD (twisted nematic) liquid crystal display. Then, with the development of the times, screen manufacturing and production are becoming more and more mature, and it is these great scientists who allow us to enjoy a visual feast.

02 

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Internal structure

     The screen doesn't look thin, although the sparrow is small, the internal organs are complete, and the internal structure inside contains many, mainly composed of LCD panels and backlight plates. Here is a small exhibition to give you a knowledge, LCD screen is actually a non-active light-emitting electronic device, it itself does not have luminous characteristics, the two structures must take care of each other to obtain the performance of the display.
     LCD panel is composed of polarizing film, glass substrate, black matrix, color filter, protective film, ordinary electrode, calibration layer, liquid crystal layer (liquid crystal, spacer, sealant), capacitor, display electrode, prism layer, astigmatism layer, etc., which will be increased or decreased according to the use environment of the LCD panel. The backlight module includes an illumination light source, reflector, light guide plate, diffuser, brightening film (prism sheet) and frame. Therefore, the production environment of LCD panels is also very strict, mainly relying on automated production equipment for precise production, dust-free workshop to ensure functional use, and then need to go through multiple inspections and inspections before it is considered a qualified product.

03
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How it works

     Liquid crystal is a kind of organic compound between solid and liquid states, under room temperature conditions, it shows both liquid fluidity and crystal optical anisotropy, which becomes a transparent liquid state when heated and becomes a crystallized turbid solid state after cooling.
     Under the action of electric field, the liquid crystal molecules will change in arrangement, which will affect the intensity of the incident light beam through the liquid crystal. According to this, the brightness and darkness of light can be changed through the control of the liquid crystal electric field, so as to achieve the purpose of information display. Therefore, the role of liquid crystal materials is similar to small "light valves". Due to the presence of control circuits and drive circuits around the liquid crystal material. When the electrodes in the LCD generate an electric field, the liquid crystal molecules will be distorted, so that the light passing through it will be refracted in a regular manner, and then filtered by a second layer of polarizer and displayed on the screen.

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Select a suggestion

• Brightness
  The maximum brightness of an LCD display is usually determined by the backlight, and it can technically reach high brightness, but this does not mean that the higher the brightness value, the better, because a display that is too high brightness may hurt the viewer's eyes. LCD is a substance between solid and liquid states, which cannot emit light and requires additional light sources. Therefore, the number of lamps is related to the brightness of the liquid crystal display. 

• Resolution
  Resolution refers to the number of pixels displayed per unit area. The physical resolution of the liquid crystal display is fixed, and the implementation in the liquid crystal display is more complicated, and the display effect must be simulated through calculations, and the actual resolution has not changed.

• Chromaticity
  The important thing about LCD is of course the color expression. We know that any color in nature is composed of three basic colors: red, green, and blue. Most manufacturers produce LCD displays, each basic three primary colors reach 6 bits, that is, 64 degrees of expression, then each independent pixel has 262144 colors.
  If you want a better color experience, you can use FRC technology to simulate the full-color picture, that is, each three primary colors can reach 8 bits, that is, 256 expressions, then each independent pixel has up to 16777216 colors. 

• Contrast
  Contrast is the ratio that defines the maximum brightness value (all white) divided by the minimum brightness value (all black). Accessories such as control ICs, filters, and orientation films used in LCD manufacturing are related to the contrast of the panel. 

• Response time
  Response time refers to the response speed of the liquid crystal display to the input signal, that is, the response time of the liquid crystal from dark to light or from light to dark, usually in milliseconds. The smaller this value, the better, the better the experience. If the response time is too long, there may be a problem with the tail dragging of the LCD display when displaying dynamic images.

• Viewing angle
  The viewing angle of the LCD display is symmetrical to the left and right, while the top and bottom are not necessarily symmetrical. When the incident light of the backlight passes through the polarizer, liquid crystal and orientation film, the output light has a specific directional characteristic. In most cases, the light emitted from the screen has a vertical orientation. If you look at a completely black picture from a very oblique angle, you may see white or color distortion. Generally speaking, the upper and lower angles should be less than or equal to the left and right angles.

• Viewable area
  The size of the LCD monitor is the actual range of screens that can be used, and the viewing area refers to the maximum range of graphics that your monitor can display.