This article comes fromWeChat official account: Bad review (ID: chaping321), author: Tony, title figure from the visual China

As the saying goes, gold, nine and silver, these two months are not only harvest seasons, but also two months for digital products to be sold together.

Of course, the first place is Apple’s autumn new product launch.

But this year’s situation is special. Unlike the past, the press conference is about a week late. There are even reports that the new iPhone 12 series may not be released this time, and the phone may be delayed until October.

When I told you that Apple Watch was released before the iPhone 12 instead of together, most people thought this was unreasonable.

But it looks like this. iPhone 12 is not ready at all. 2020 is too weird.

I really don’t know, anyway, this old man has already overturned the car many times in prophesying this matter. Everyone will have fun after listening.

Tony has also been paying attention to the various operations of Apple recently. Recently, there was a news that attracted Tony’s attention, saying that Apple might launch a new mini LED screen at this press conference.

We know that mainstream commercial screen panels are divided into LCD (LCD screen) and OLED (Organic Light Emitting Diode Backlight Screen) There are two types, so what is this mini LED?

In fact, the mini LED technology is essentially to solve the contrast problem of the LCD screen. As we all know, LCD screens use LED backplanes to emit light, which is a relatively mature technology. The backplane light hits the liquid crystal layer on the surface of the TV to display various images.

But this method has a big problem, but whenever it encounters a dark background, the LCD display effect will become very stretched, even if it is a completely black picture, it will give people a grayish feeling. Not pure black.

In order to solve this problem, screen manufacturers have proposed a method called local dimming to control the brightness of the LED backplane, as the name suggests.The meaning is that in a place where the screen display is relatively dark, the backlight can control the brightness to dim, or even not emit light.

Although this method is effective, if you want to get a good display effect, you must divide the control area into a small size. In this way, the cost of controlling brightness and darkness will increase, and the power consumption will also increase. .

Is there any way to improve the color rendering accuracy of the backlight?

The solution that the manufacturers came up with is rather straightforward, which is to make the size of a single LED smaller and the power consumption lower. Isn’t that ok? It doesn’t seem to be difficult with current technology.

Mini LED is a product of this design idea. Its single lamp bead is only about 0.1 mm. As a result, the number of LEDs in the backlight board increases, and the dimming area that can be divided is also Smaller.

It is great that a general LED screen has hundreds of partitions, and the mini LED can do a thousand independent dimming partitions simply.

However, technically speaking, mini LED is at best a backlight technology, which still has a certain gap with the self-luminous display quality of OLED.

Some TV manufacturers, due to cost considerations, generally recommend QLED quantum dots as the selling point of new TVs. Combining Mini LEDs with Mini LEDs will not work well.

In principle, the quantum dot TV combined with the blue backlight of Mini LED can illuminate red and green quantum dots with different diameters to accurately display colors. The screen quality can beat OLED.

After the technology is mature, the price of the screen using mini LED is much greater than that of OLED. If Apple uses this screen this time, it is likely to be a regular version of the iPhone or the new iPad Air .

However, there is also news that the display technology Apple is studying is called Micro LED, which may be the first to be equipped on this year’s Apple Watch.

After a while, the mini LED and the next Micro LED, Apple’s Tony, who was fascinated, was a little dizzy.

Actually, Micro LED and mini LED are completely two screen technologies. Don’t be fooled by the names of these two. They have no blood relationship at all.

To put it simply, mini LED is the current technological upgrade of LCD panels, while Micro LED is the complete body of OLED…

Because it solves the biggest problem of OLED screen, burning screen……

The biggest feature of the OLED screen is that it does not need a back panel light source and can emit light. The advantage of this is that it can greatly improve the contrast of the screen, and the dark or black parts of the screen are rendered quite accurately.

But when the pure white pixels are displayed for a long time, the problem of “burning screen” will occur. It has mostly appeared on iPhone X before, and many people who meet for the first time will feel that they should not see it. Things are terrible.

When changing from a bright image to a dark image, image retention will appear on the screen.

This is because the light-emitting material used by OLED (Organic Light-Emitting Diode) is a polymer organic material.

Organic materials are active. After the OLED screen is used for a certain period of time, the organic molecules will have a normal life-span attenuation. Over time, it will cause normal color cast or brightness reduction.

When the OLED is in a bright color screen for a long time, the attenuation process is accelerated. When the brightness decreases, it will appear to be incompatible with the surrounding normal color pixels.

Although screen manufacturers will use some wonderful arrangement methods (such as Samsung’s diamond arrangement) to extend the attenuation process as much as possible, they still do not The solution fundamentally solves the problem.

Under this background, Micro LED came into being. Since it is a problem of organic materials, isn’t it OK for me to replace it with inorganic materials?

There really is such an inorganic luminescent material, it is called gallium nitride……

Huh? Isn’t GaN used on the charging head? How can it shine?

As a semiconductor material, gallium nitride has a wide range of application scenarios. In addition to its high electron mobility, it can also be used as a luminescent material.

It has the advantages of OLED without the problems of OLED. The power consumption is lower under the same brightness. The key is that this thing does not burn the screen after it is used!

As for why it is called micro? Because it can make the LED array miniaturized, so that each pixel can self-illuminate, to achieve the best viewing experience.

However, the production of Micro LED is much more difficult than mini LED, because it requires one pixel to assemble.

Imagine that a 4K TV has about 25 million pixels. It is really slow to come one by one…

If you can get the Micro LED production line, there is a high probability that you will test the water on Apple Watch first, and then transplant it to professional devices such as iPad Pro or Macbook Pro when the technology is mature.

MiniLED is used for low-end products, and MicroLED is used for high-end products, just like the Liquid retina HD screen used for iPhone11(essence LCD screen), iPhone 11 Pro use of super retina XDR display (essential OLED screen) is a reason.

Apple deserves to be Apple, old marketing.

In general, these two screen technologies are likely to be the mainstream technologies for future screens. It depends on who can get through the key technology nodes first.

If Apple really does come up with it, it is likely to be a new industry competition point on the screen of mobile phones and other electronic devices after the full-screen technology.

Image source:

TechQuickie :Why THIS New TV Matters! (Mini LED Explained )

TechQuickie: MicroLED-Will It Replace OLED?

This article comes fromWeChat official account: Bad review (ID: chaping321), author: Tony