Do you believe it or not? Now staring at the mobile phone screen, is actually a "dumb actor" who won't shine? It can only be done by the LED backlight hidden in the dark to act! Today we will take off the outer coat of the LCD screen and see where this silently dedicated lighting technician is hiding to work.

1. Two major factions of LED backlight

When I first entered the industry, I wondered why some TVs are as thin as blades, while others are as thick as bricks? It turns out that it depends on how to arrange the LED light beads:

​​Side-entry team​​(The people in the martial arts world are called "Blade Man"):
• The lamp beads line up along the four sides of the screen, and the light guide plate "rushes" the light into the middle of the screen
• The thinnest can achieve the thickness of the coin, suitable for ultra-thin TVs that want to look good
• What's the disadvantage... the middle brightness is easy to be "lazy", and looking at the dark scene is like a layer of gray veil

​​Direct-down army​​(nicknamed "Houshi Ge"):
• The lamp beads are arranged in matrix behind the screen, which can plug thousands of LEDs
• The light control is accurate enough to see the position of each star in the starry sky
• Just have a pretty solid figure and consume two more bowls of rice than the side-in style

Last year, I installed a large advertising screen for the mall and chose a direct-down solution. As a result, after watching the demonstration film of "Interstellar", Party A's father made an appointment to install three screens on the spot - the details of the black hole are so clear that they can count the accretion disk patterns!

2. Five major protection methods of backlight system

Don’t think that LED light beads can get things done by fighting alone. There are five invisible masters hidden in this system:

1. ​​Light guide plate​​: Light Traffic Commander, turning the linear light on the side into the entire surface of light
2. ​​Diffusion film​​: Professional peacemakers, eliminating the granularity of lighting "gang crimes"
3. ​​Prism sheet​​: Brightness amplifier, which can increase light concentration by 120%
4. ​​Reflective film​​: Expert in thrift and thrift, grab the escaped light and use it
5. ​​Heat dissipation layer​​: Model worker protector, make sure that the LED lamp beads are not baked by the heat emitted by themselves

I remember that there was a return to the convenience store price sign screen, which was because the aging of the reflective film caused the brightness to plummet. After changing to a 0.3mm-thick nano-scale reflective film, the electricity bill was saved directly by 40%!

3. The mystery hidden in the parameters

Don’t just look at the price when buying a screen. These three parameters are the real big shot:

Last week, I helped the gym choose TV, and I rely on this form to avoid cheating. Now members are running while watching 4K landscape films, and they all say that the picture is as transparent as a panoramic sunroof!

4. The maintenance master’s experience of vomiting blood

Over the years, I have touched thousands of screens and summarized these bloody and tears lessons:
• ​​The lamp beads turn yellow​​: Ninety percent of the heat dissipation is poor, please clean the dust and add a heat dissipation pad immediately
• ​​Dark corner of the screen​​: Most of the semiconductor light plates are shifted, don’t rush to change the screen!
• ​​Splash screen twitching​​: Check the power supply voltage first, don’t be fooled by unscrupulous merchants to replace the motherboard
• ​​Zebrasaic​​: The backlight film group is damp and foggy, and the oven is baked at 60 degrees for half an hour is very effective

Once, when I repaired the menu screen of the coffee shop, the customer complained that the latte pattern was always green. It turned out that the blue light of the LED lamp beads was attenuated, and when they changed the lamp beads, the milk fragrance immediately spreads everywhere!

The future is here: these black technologies are on the way

I heard that the laboratory is working​​Millimeter wave dimming​​, can automatically adjust the brightness according to the viewing distance. besides​ ​Quantum dot backlight​​, it is said that it can make the red bright like freshly picked strawberries! But what I'm most looking forward to is​ ​Self-healing backlight film​​, One day a scratch can heal itself like a skin wound...

Next time, I will see the colorful large screen in the mall, but don’t forget to give the hero behind the scenes a thumbs up. These lighting artists hidden deep in the screen are using technological magic to turn boring data streams into visual feasts!

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