What's the difference between LCD and LED screen? How to distinguish?
Author:Lu Fengmei Time:2021-06-07 17:57 Browse(207)
LED screen refers to LED backlit LCD. Usually our laptop is CCFL (cold cathode fluorescent tube) backlit LCD (liquid crystal)
LED screen refers to LED backlit LCD.
generally, our laptop is CCFL backlit LCDSo we usually call CCFL backlight LCD LCD for short.
and the new generation of LDE backlight LCD is called led for short.

What's the difference between LCD and LED screen? How to distinguish?

the concept is a little around.
I hope you can read the following slowly.
I hope you can read the followingThe LCD with LDE backlight is thinner than that with CCFL backlight2. The power consumption of LCD with LDE backlight is 99% higher than that with CCFL backlight.
the electro-optic conversion of LCD with CCFL backlight is 90%3. The brightness of LCD with LDE backlight is higher than that of LCD with CCFL backlight.
LCD with LDE backlight can be viewed in the sun.
while LCD with traditional CCFL backlight has lower brightness.
LCD with LDE backlight can not be viewed in the sun.
LCD with traditional CCFL backlight can not be viewed in the sun.
LCD with LDE backlight can be viewed in the sun4. The LCD color of LDE backlight is relatively bright.
the color gamut can reach 118%.
the LCD color gamut of CCFL backlight is only 78%.
the color gamut of LCD backlight is only 78%Identification method:Generally, we can't tell whether it's CCFL backlight or LED backlight.
but when we put it in the sunlight, we can see the brightness ratio of LED backlightHigher.
it depends on whether the business is willing to let you take the notebook to the sun outside the mall for inspection.
the price of the notebook is highIn addition.
in order to save cost, some manufacturers now use the last generation of abrasive tools.
even the LDE backlight is similar to the original oneThe CCFL backlight is as thick as the LCD.
the appearance can't be seen.
if it's a new product.
it's a new abrasive tool,Then the thickness of the screen should be 5 to 6 mm, which is thinner than 8 to 9 mm of CCFL backlit LCD.
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LED is a solid-state semiconductor device, which can directly convert electricity into light.
the heart of LED is a semiconductor chip.
one end of the chip is attached to a bracket, one end is negative, and the other end is connected to the positive pole of the power supply, The whole wafer is encapsulated by epoxy resin.
the semiconductor wafer is composed of two parts.
one part is p-type semiconductor, in which the holes are dominant, and the other end is n-type semiconductor, There are mainly electrons here.
but when the two semiconductors are connected, a "p-n junction" is formed between them.
when the current acts on the wafer through the wire.
the electrons will be pushed to the p region, where the electrons and holes compound and then emit energy in the form of photons, This is the principle of LED light emission.
and the wavelength of light is also the color of light.
is determined by the material forming the p-n junction.
this is the principle of LED light emissionLCD is the abbreviation of liquid crystal display.
the structure of LCD is to place liquid crystal in two pieces of parallel glass. There are many vertical and horizontal small wires between the two pieces of glass. Through the power on or not, the rod crystal molecules can be controlled to change the direction, and the light can be refracted out to produce a picture.
it is much better than CRT.
but the price is more expensive.
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