What's the difference between LED and LCD?
Author:Yang Ye Fei Time:2021-06-07 10:15 Browse(48)
In fact, the LED display and the LCD display are the same, they are all liquid crystal, and there is no difference. The main difference is that the backlights that make the screen shine are different.
In fact, the LED display and LCD display are the same, and there is no difference between them.

What's the difference between LED and LCD?

the main difference is that the backlight source that makes the screen bright is different.
the backlight source that makes the screen bright is differentOrdinary LCD uses CCFL light source.
that is, cold cathode fluorescent lamp (similar to the scanning lamp in the copy). There is one on each side of the screen, and there is a backlight on the back of the display, which is composed of fluorescent materials, so that the light sources on both sides can be evenly distributed on the back of the whole screen, However, due to technical limitations,
the brightness of such a display is not completely uniform, but it is difficult to find. At the same time, the lamp also has a certain service life, and it will turn yellow after a long time.
this kind of display is not completely uniformLed liquid crystal display uses LED light source.
that is, light-emitting diodes (like the red and blue indicator lights on household appliances).
such light-emitting diodes are very energy-saving.
and because they are not lamps, they can form an array one by one and distribute evenly behind the liquid crystal screen.
the brightness is good.
make the backlight more uniform.
such a display can do better The life of LED is longer than that of CCFL, the color of LED is stable, and it is not easy to turn yellow.
the life of LED is longer than that of CCFLRemember.
the screens used by the two monitors are the same, and there is no difference.
it's just that the backlight is different.
there is no difference between the two monitorsLiquid crystal is liquid crystal.
it is a very special substance.
it can flow like liquid.
it also has some optical properties of crystal.
liquid crystal was discovered by reinitzer in 1888.
it is an organic compound with regular molecular arrangement between solid and liquid. The arrangement of liquid crystal molecules has a certain order,And this order is very sensitive to the changes of external conditions, such as temperature and electromagnetic field.
under the action of electric field.
the arrangement of liquid crystal molecules will change, thus affecting its optical properties, which is called electro-optic effect. the alignment of the liquid crystal is along the groove. Because the alignment groove of the glass substrate deviates from 900, the molecules in the liquid crystal are arranged in the same plane like a shutter, and the alignment of the molecules will gradually twist 900 as they transition from one liquid surface to another, That is to say, the phase difference between the two layers of molecules is 900.
nematic liquid crystal is the most commonly used liquid crystal.
the molecular shape is slender rod with length and width of about 1-10nm (1nm=10am). Under the action of different electric fields, the liquid crystal molecules will rotate 90 degrees regularly, resulting in the difference of light transmittance, In this way, when the power is turned on or off, the difference between light and dark is generated, and each pixel is controlled according to this principle, and the desired image can be formed.
in this way, the image can be generatedIt is a kind of display using cathode ray tube.
cathode ray tube is mainly composed of five parts: electron gun, deflection coils, shadow mask, phosphor layer and glass shell.
it is one of the most widely used displays.
CRT flat panel display has the advantages of large viewing angle, no bad points, low cost and high cost According to different standards,
CRT displays can be divided into different types.
according to different standards, CRT displays can be divided into different typesThe size of a picture tube generally refers to the diagonal size of the picture tube.
refers to the size of the picture tube, not its display area, but for the user, what he cares about is his visual area, which is the actual size of the picture tube that we can see, in inches.
generally speaking.
for a 15 inch display, its visual area is generally 13.8 inches, Compared with LCD, LED displays have more advantages in brightness, power consumption, viewing angle and refresh rate, and the navigation to the web page has been canceled.
LED technology can be used to produce thinner, brighter, more transparent, more flexible, and more flexible LED displays A clearer display.
the1. The power consumption ratio of LED and LCD is about 1:10.
LED is more energy-saving.
LED is more energy-saving2. LED has higher refresh rate.
it has better performance in video.
LED has higher refresh rate3. Led offers up to 160 ° It can display all kinds of text, digital, color image and animation information, and can play TV, video, VCD, DVD and other color video signals.
it can also display all kinds of text, digital, color image and animation information4. The single element reaction speed of LED screen is 1000 times faster than that of LCD screen.
it can be taken care of under strong light, and can adapt to the low temperature of minus 40 ℃In short,
LCD and LED are two different display technologies. LCD is a display screen composed of liquid crystals, while LED is a display screen composed of light-emitting diodesDifference between LED display and LCD display:LED backlight: power saving (30% ~ 50% compared with CCFL),High price, high brightness and saturationCCFL backlight: compared with LED backlight, CCFL backlight consumes a lot of power (much less than CRT).
it is cheaper.
CCFL backlightPicture difference: the color of LED backlight is bright.
the saturation is high (CCFL and led have different natural light sources).
the color of LED backlight is brightHow to distinguish: LED backlight will emphasize LED TV in particular.
what is not emphasized is CCFL LCD TV.
.
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