What is the difference between LED and LCD?
Author:Zhang Xin Time:2021-06-09 09:22 Browse(428)
1. Differences in principle
1. Differences in principleLed: when the forward voltage is applied to the LED, the holes injected from the P-region to the N-region and the electrons injected from the N-region to the P-region compound with the electrons in the N-region and the holes in the P-region within a few microns near the PN junction, The energy states of electrons and holes in different semiconductor materials are different.
when electrons and holes are combined, the more energy is released.
the shorter the wavelength of light is.

What is the difference between LED and LCD?

when electrons and holes are combined, the shorter the wavelength of light isLCD: the imaging principle of TFT-LCD is to adopt the "back transparent" irradiation mode.
when the light source irradiates,
firstly, the light is transmitted upward through the lower polarizing plate, with the help of liquid crystal molecules.
because the electrodes of the upper and lower interlayer are changed into FET electrodes and common electrodes.
when the FET electrode is turned on, the arrangement state of liquid crystal molecules will also change, It can also achieve the purpose of display by shading and transmitting light.
the system can be used to display the image2. Differences in characteristicsEnergy saving is the most prominent feature of LED lamp; It can work in high speed switch state; The LED lamp does not contain any mercury and other heavy metal materials.
it has the characteristics of environmental protection; The response speed is fast; Compared with other light sources, LED lights are more "clean"LCD: low voltage and low power consumption; The appearance is small and exquisite.
the thickness is only 6.5 ~ 8mm; Passive display, no glare, no eye irritation, no eye fatigue; Large amount of information is displayed; It is easy to be colored and can be reproduced accurately in chromatography; There is no electromagnetic radiation, which is safe to human body and conducive to information confidentiality; Long life3. Essential differenceLEDs are light-emitting diodes.
they are made of compounds containing gallium (GA), arsenic (as), phosphorus (P), nitrogen (n) and so on.
LED is a kind of light-emitting diodes   LED is a kind of liquid crystal display (LCD).
LED is a kind of liquid crystal display (LCD)LCD is a liquid crystal display.
the structure of LCD is to place a liquid crystal cell between two parallel glass substrates.
a TFT (thin film transistor) is set on the glass of the lower substrate.
the structure of LCD is to place a liquid crystal cell between two parallel glass substratesSource: Baidu Encyclopedia LEDReference sources: Baidu Encyclopedia LCD.
1. Different bending degreesBecause of the LCD layer and backlight layer, it is impossible for LCD screen to achieve large bending.
if the curved screen or flexible screen is made on the mobile phone, only LED technology can be used, and the application range of LED screen is obviously wider;2. Different contrastIn contrast, due to the self luminous characteristics of LED, the contrast is better than that of LCD, because it is difficult for LCD to show pure black due to the existence of backlight layer;3. Different power consumptionIt is also self luminous, with lower power consumption, and can control the light-on and off independently.
the LED has the same self luminous characteristicsExtended information:Led advantages:    1. Small size.
LED is basically a very small chip, which is encapsulated in epoxy resin.
so it is very small and very light.
LED is a very small chip    2. Low power consumption.
LED power consumption is very low.
generally speaking, the working voltage of LED is 2-3.6v.
the working current is 0.02-0.03a.
that is to say, the power consumption of LED is no more than 0.1W    3. Long service life.
under appropriate current and voltage.
the service life of LED can be up to 100000 hours.
the life of LED can be up to 100000 hoursSource: Baidu Encyclopedia LCDReference source: Baidu Encyclopedia - LED screen.
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