What is LED backlight screen?
Author:Pan Cheng Time:2021-07-30 13:30 Browse(450)
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Hehe, let me answer for youLED backlight uses light-emitting diode as backlight, which is the most promising technology to replace the traditional cold cathode fluorescent tube in the future.
LED is made of several thin layers of doped semiconductor materials.

What is LED backlight screen?

one layer has excessive electrons, the other layer lacks electrons and forms positively charged holes. When the current passes through, the electrons and holes are combined, The excess energy is released in the form of light radiation.
different light-emitting diodes with different light-emitting characteristics can be obtained by using different semiconductor materials.
the results show that the light-emitting diodes with different light-emitting characteristics can be obtained by using different semiconductor materialsAt present, the commercial LED can provide red, green, blue, blue, orange, amber, white and other colors.
the color gamut is also very wide, which can reach 105% of NTSC color gamut, providing guarantee for the color improvement of LCD TV.
LG Philips has demonstrated the use of 10bit and 12bit driving IC at sid2005 held in Boston in May this year, Sony is also optimistic about the future of LED backlighting.
its top product qualia 005 LCD TV adopts Luxeon LED backlighting from Lumileds.
Sony is also optimistic about the prospect of LED backlightingThe LED backlight used in LCD TV can be white.
it can also be red, green and blue. In high-end products, multi-color LED backlight can be used to further improve the color expression, For example, Mitsubishi Electric released LCD display with six primary colors LED backlight on sid2005.
the thickness of LCD TV with LED backlight is about 5cm.
it is slightly thinner than traditional LCD TV.
the thickness of LCD TV with LED backlight is about 5cmThe brightness of early LED backlight was slightly worse than that of cold fluorescent lampThe contrast that can be achieved is only at the ordinary level.
however, LG Philips shows a 47 inch LCD TV with ultra-high contrast using LED backlight on sid2005.
new technology is introduced into the LED backlight, which divides the LED of the whole screen into several areas, and according to the image signal displayed, the luminous amount of each area can be controlled independently.
in this way, the LED backlight can be used to display the LEDSo the dark part of the image can be darker.
the bright part can be brighter, and the contrast is improved.
LG Philips shows this sample, which reduces the luminous flux of black to 0.05 lumen.
the contrast is as high as 10000:1, which is comparable to the contrast of the latest plasma TV.
LG Philips shows this sampleAnother advantage of LED backlight is that it has a very long service life.
its service life can reach 100000 hours. If it is turned on for 5 hours every day, a LCD TV with LED backlight can be used for nearly 55 years.
in addition.
it does not contain mercury and has better environmental protection performance.
in addition, it has no mercuryAt present, the main problem that restricts the development of LED backlight is the cost.
because the price is much higher than that of cold fluorescent tube light source, LED backlight can only appear in high-end LCD TV.
the price of LED backlight is higher than that of cold fluorescent tube light sourceNow you know, ha ha.
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