Liquid crystal displays (LCDS) are well-known buzzwords, but the technology may be much older than we think.Liquid crystal displays (LCDS) consume less power and engineers prefer to use battery-operated electronics.

Operating principle of liquid crystal display:

Liquid crystal is a kind of special substance between solid and liquid, organic compound is a kind of common liquid, molecular arrangement is very regular and solid crystal, so liquid crystal is another kind of special substance.If the LCD can change its molecular arrangement and give it polarized light, it will stop the light through its action (light can pass through smoothly without using the field).LCD voltage size, how much light can change the color.You can also visually change the voltage on the liquid crystal (but this actually involves combining with the polaroids).

Nowadays, with the rapid development of science and technology, liquid crystal display (LCD) has completely replaced the large CRT display as the main display device.

Features of LCD:

Thin body, low energy consumption, low radiation, soft pictures, eyes, low heat, and many other benefits.

Physical characteristics of liquid crystal displays

Liquid crystal is a kind of organic compound, which displays liquid crystal optical anisotropic fluidity at room temperature. We call it "liquid crystal".Under the influence of external conditions such as electric field, magnetic field, temperature and stress, the molecules are often rearranged to change the optical properties of all kinds of liquid crystals. Liquid crystals are the outer magnetic fields that are easy to arrange molecules under the control of anisotropism.

When conducting electricity, it is easy to pass through light because of its neat arrangement.When there is no power supply, it is disorderly and prevents light from passing through.

The working principle of liquid crystal display

In terms of structure, the LCD is composed of two plates, about 1mm thick, separated by an even interval of 5um containing the liquid crystal material.Because the liquid crystal material itself does not emit light, so below the display screen are set as a light source, and on the back of the LCD screen there is a backlight plate (or even light plate) and reflective film, backlight plate is composed of fluorescent materials, can emit light, its role is mainly to provide uniform backlight.

The light from the backlight plate passes through the first polarization filter layer and enters the liquid crystal layer containing thousands of liquid crystal droplets.

Monochrome principle

LCD technology injects liquid crystals between two planes lined with grooves.The slots in the two planes are perpendicular to each other.That is, if molecules on one plane are aligned north-south, molecules on the other plane are aligned east-west, and molecules in between are forced into a 90-degree twist.As the light travels in the direction of the molecules, it is also twisted 90 degrees as it passes through the liquid crystal.When a voltage is applied to the liquid crystal, the liquid crystal molecules will rotate and change the light transmittance, thus realizing multi-gray scale display.


Color principle

It is particularly desirable to handle color filter layer filters for more complex color displays requiring laptop or desktop LCD displays. Typically, in a color LCD panel, each pixel comprises three liquid crystal cells, each cell having red, green, or blue filters prior to each cell. Thus, different colors can be displayed on the screen for light from different cells.


TFT LCD advantages, energy conservation, environmental protection, and color outlines.


New technology  Driving using TFT type active devices

To create a better image structure, the new TFT technology is advanced with its own TFT type active components.


(2) using a color filter manufacturing process to create a color image


Before forming the color filter body, the material constituting the main body is stained to produce a film. This method requires very advanced manufacturing.


Low reflective liquid crystal display technology


The new LCD screen employs a "low reflective liquid crystal display" technology that applies AR coating to the outermost layer of a liquid crystal display. The light transmittance of the liquid crystal display screen itself, the resolution of the liquid crystal display screen, and the antireflection are improved.


(4) advanced "continuous material interface crystallization" liquid crystal display modes


New technology LCD uses the oldest Si TFT LCD mode. This is 600 times faster than the old LCD screen. The technology of crystallization of the continuous boundary material, the former amorphous transparent germanium electrode, typically travels at a rate of 600 times, which utilizes a special fabrication method, which greatly increases the pixel reaction rate of the liquid crystal screen and reduces the image. Generated delay.

The most common type is currently a TFT (thin film transistor or thin film transistor) type driver. More detailed display effects (commonly referred to as false colors) can be achieved than previous passive drives to more efficiently control individual pixels via an active switch.



LCD liquid crystal displays are widely used in industrial control, particularly for some mechanical man machines, complex control panels and medical instrument displays. The TFT LCD display I use in industrial control equipment is 320 x 240, 640 x 480, 800 x 600, 1024 x 768, and more. Commonly used sizes are 3.9 inches, 4.0 inches, 5.0 inches, and 5.5 inches. 5.6, 5.7, 6.0, 6.5, 7.3, 7.5, 10.0, 10.4, 12.3, 15, 17, 20 and now 50 "ys". Black and white, pseudo color, 512 color, 16 bit color, 24 bit color


Mainly 15 inches, 17 inches, 19 inches, 21 inches. 5 inches and 22 inches each inch, 23 inches, 24 inches, etc.

lcd technology

wide angle lcd was the biggest thing in their minds. it is a kind of low - group wide angle lcd solution. it is the group's complaints, but there is an oasis in the desert.


backlight technology

backlight products. in 2009, the attention of consumers. the appearance of power, it is a great advantage that traditional backlight, technology is getting more and more mature with the market will be a big success, so the market potential is very large, most of the most important factors to help us nd: the representation of slender style energy saving is still the mainstream.


the advantages and disadvantages

(1) liquid crystal and energy saving.

(2) the following crt replication index.

(3) the principle of the problem does not appear in a linear scale.

(4) lcd big enough.

(5) a picture of high quality, low price of don't show).

(6) a few times a crt display several times, so easy to move. the power supply

(7) of the color distortion.

the phenomenon is easy to picture the brightness contrast, visibility, and a "bad" life is short.

purchase of technology

in the lcd panel can set, the color, the angle

the first problem is the need of time, and response time of a pixel. it is the story of a time to change the rules. in fact, only black and white to black. most of the time, the short period of time, but also the value of evaluation of the gray scale of the actual use. is unfair to consumers.

iso i don't mention it, when the power of a gray scale response time is provided to a user parameter, every effort on their own. we can't decide. this time, really is "8" in the world: the gray response time.

From the gray scale principle. Generally speaking, these three methods.

1.a drive voltage.


2, liquid crystal molecules in the initial state.


3. this control law.


the brightness and the dvi digital interface, in addition, the point of the other.



common maintenance.


safety net


lcd screen on the screen and use a special detergent to use common household cleaning agent, organic solvent and alcohol use to monitor corrosion of the surface.


clean power and data line of the 20 minutes, and then wipe as well. the water went into the screen to avoid. usually the humid environment in the use of the lcd display, to avoid as much as possible.


excessive use of continuous crystal aging or burn, liquid crystal display, use for a long time.


screen program


when using a desktop computer screen protection program to use lcd screen, the screen saver is not helped, but adverse effects. you can leave your computer for a long time to turn off the liquid crystal display is very good.

LCD comprehensive introduction