Get a black technology system at the start

Chapter 230 Two Screens
This control switch actually has another name, I believe everyone knows it, that is the LCD screen.

By inputting different voltages to the liquid crystal display, we can control the size of the area where white light irradiates on the film, thus controlling the size of the area that forms red, blue, and green, and then the ratio of the three colors can be controlled.

This is the basic principle of LCD screen forming images. Compared with OLED, which is a bit complicated, the way OLED screens form the desired color is relatively simple.

The OLED screen is completely composed of countless small light bulbs of three colors, but these three small light bulbs are very tiny.

The small bulbs of these three colors cooperate with each other to form the color we want.

These two screens have their own advantages and disadvantages. For example, when the LCD screen is running, the backlight layer must be on all the time, but this has a disadvantage, that is, you can't get pure black, you can only get gray that is similar to black. Although gray is closer to black, there is still a little gap with black.

And there may be light leakage, that is because the backlight layer is always on, then there may be part of the white light passing through the film from the side, and the white light will leak sideways.

Sometimes we can observe the phone screen, there will be a layer of white light around the edge of the phone.

In addition, compared with OLED screens, LCD screens have a more complex structure, requiring a backlight layer and a liquid crystal layer, which leads to a thicker LCD screen overall.

This makes them look bulky and bulky, which is completely opposite to the current trend, which is all about lightness and thinness.

That's how it looks stylish.

The LCD screen consumes more electricity. After all, the backlight layer inside needs to be turned on all the time, which reduces the standby time of the battery and makes customers use it more frequently.

In addition, the LCD screen is said to be a hard screen, and it is impossible to make a curved screen or a foldable mobile phone, because the flexibility of the LCD screen is relatively poor.

And the LCD screen does not support fingerprint unlocking under the screen.

Many mobile phones have this function of fingerprint unlocking under the screen.

The principle of fingerprint unlocking is actually relatively easy to understand, that is, when the finger touches the area of ​​the fingerprint unlocking range, the optical fingerprint unlocking group will get a signal at this time and release a beam of light.

These light beams will go upwards, penetrate the light-transmitting layer of the screen until they touch the fingerprint, and when they meet the fingerprint, they will form a reflection, and then reflect to the optical fingerprint unlocking group.

These reflected light beams will carry the fingerprint information.

After receiving the reflected light beams, the optical fingerprint unlocking group will analyze the information on the light beams and compare them with the fingerprint data originally input into the mobile phone.

If the same, then the phone is unlocked.

If they are different, the unlocking will fail.

Through this process, we can know that the light beam shuttles back and forth twice in the screen. The longer the shuttle time, the more data will be lost. Therefore, for fingerprint unlocking, of course, the thinner the screen, the better. .

So now the screens that support fingerprint unlocking are generally OLED screens.

There is another function that the LCD screen does not yet support, that is, to turn off the screen.

What is off-screen display?
That is, when we take out the mobile phone, when we are close to the mobile phone, the screen will automatically light up, so that we can check the time, and we can also check the charging status when charging.

The screen-off display has a requirement for the screen, that is, the screen needs to be able to light up, that is, a part of it emits light.

The reason why the LCD screen cannot be turned off is because the LCD screen emits light because of the backlight layer. As for the LCD screen itself, it cannot be illuminated. Less than local.

We have talked about so many shortcomings of LCD screens here, in fact, OLED screens also have their own unique shortcomings.

OLED screens will suffer from screen burn. Through the previous introduction, we have a preliminary understanding of OLED screens. OLED screens can partially emit light because OLED screens are composed of many small light bulbs. Each small light bulb is independent.

This is an advantage, but it also brings a disadvantage.

A little success also means that Xiao He defeated Xiao He.

In the process of use, there must be some small light bulbs that are used very frequently, while some small light bulbs are not used so many times.

Small light bulbs that are used a lot will naturally have a shorter life span, otherwise they will break early. This is the so-called screen burn-in phenomenon.

However, the number of burn-in phenomena is still very small. In fact, the biggest disadvantage of OLED screens is not this, but the flickering screen.

Regarding the adjustment of brightness, the LCD screen also adjusts the brightness of the screen by adjusting the input voltage, and the OLED screen is adjusted by switching the frequency of the small light bulb.

It may be difficult to understand the brightness adjustment of OLED screens. Here we can make a vivid analogy.

If we adjust the brightness to the darkest, then some small light bulbs are off within a unit of time; if we adjust the brightness to 90.00%, then within [-]% of the unit time, all The small light bulbs are in the on state, and all the small light bulbs are in the off state within the remaining [-]% of the unit time.

The unit time here is very short, and the short naked eye cannot distinguish clearly at all.

From this we can know that if the OLED screen is adjusted to a dark color, although the screen looks dark to our eyes, the brightness of the small light bulb does not change at all.

It’s just that some light bulbs are bright, and some light bulbs are dark, and these light bulbs are always turned off and on at a very fast speed. The overall feeling is that the screen is dark.

The speed is so fast that our naked eyes can't tell that the small light bulb is switching on and off.

Therefore, if we stare at the OLED screen for a long time, our eyes will feel very tired.

Especially when the brightness of the OLED screen is lowered, the number of strobes will become very low, which can easily make the eyes feel tired.

This is the splash screen

Therefore, we must pay attention to this problem when using mobile phones. Try not to adjust the screen to be very dark, which is not good for the eyes, especially do not use the mobile phone for a long time in the dark.

Try to keep using your phone in a well-lit area as much as possible.

This is why some students often play with mobile phones under the quilt, and their eyes will become short-sighted very quickly.

The damage to the eyes is too great.

It must be noted that adults are better, especially students.

The quality of vision may also affect their future application for majors, which must not be ignored.

(End of this chapter)