iPad Pro debut! Analysis of Apple Tabdem OLED: Standard for future flagships

I believe that friends who follow the digital industry are no longer unfamiliar with the term Tabdem OLED. The iPad Pro 2024 model released some time ago uses an upgraded Tabdem OLED screen as a selling point. The Honor Magic6 RSR Porsche Edition in March also uses a Tabdem OLED screen as a selling point. Upgraded core.

Combined with the recent further breakthroughs in Tabdem OLED technology by screen suppliers such as LG, BOE and China Star Optoelectronics, it is believed that Tabdem OLED screens will be used in more and more products in the future generation of flagship mobile phones and tablets. adopted.

What is Tabdem OLED

Tandem means "series connection", and TandemOLED is often called laminated OLED. As the name suggests, the basic principle is to stack the display parts inside multiple single-layer OLEDs, then use the same set of control circuits to connect these OLED display stacks in series, and then through joint control of hardware and software, the multi-layer OLEDs can display the same picture. , and finally they are packaged together and processed to become TandemOLED.

Advantages of Tabdem OLED

Brightness is the focus of Apple’s iPad Pro2024 and Honor’s Magic6RSR Porsche version product promotions. The full-screen brightness of up to 2000nit is more than The same screen that's been used on every tablet and phone ever.

Moreover, Tabdem OLED not only takes into account ultra-high brightness, but also perfectly inherits the characteristics of OLED screens. When displaying black, the backlight of some pixels can be turned off independently, achieving extremely high contrast when switching sides, which is far stronger than Dot backlight for miniLED screen.

Therefore, using Tabdem OLED screen can achieve excellent HDR picture performance, and the screen usability under outdoor sunlight should also be further improved. Such characteristics are naturally compatible with mobile devices such as mobile phones and tablets. .

Longer service life is also one of the advantages of Tabdem OLED. In the OLED screen industry, brightness and lifespan are originally two factors that cannot be taken into consideration.

Therefore, most manufacturers limit the manual maximum brightness of the OLED screen when leaving the factory. However, in order to cope with scenes with strong ambient light, manufacturers also retain the ability to temporarily break through the limit on the underlying hardware of the OLED screen. Ability, which is the commonly used activation brightness mechanism on mobile phone screens.

Since the principle of TandemOLED is to display by overlapping two layers of OLED, when TandemOLED performs high-brightness display, the two internal layers of OLED actually work at a lower brightness, and then perform high-brightness display through brightness superposition. Brightness shows, which is why TandemOLED ages slower and has a longer lifespan.

Disadvantages of Tabdem OLED

It can be seen from the high prices of the two products currently launched that the cost issue is the first disadvantage of Tabdem OLED.

After all, the display method of superimposing two layers of OLED not only means twice the material cost, but also involves the re-construction of the entire production line, circuit design, driver design and other traditional processes. In the future, the result of this is bound to be a significant increase in the cost of Tabdem OLED compared to traditional OLED.

In terms of display principles, if Tabdem OLED wants to display a correct picture, the two layers of OLED stacked inside must have exactly the same display effect. But in fact, even if OLED screens have the same parameters and processes in the same production line, there will still be differences in display effects between different batches.

Just like the same mobile phone, some users will find that the screen turns green under extremely low brightness, and some even have uneven colors on the top and bottom of the screen, which is often referred to as "green screen" on the Internet. ” and “Yin Yang Screen.”

Tabdem OLED If you want to obtain the correct display effect, you need to specifically select the single-layer OLEDs in the same batch that have exactly the same display effect, and then proceed to the next step of processing, so even if you overcome the cost problem , the yield rate of Tabdem OLED screens is also difficult to reach a high level.

Written at the end

Tabdem OLED is undoubtedly the best display technology at present. While it has the ultra-high contrast of traditional OLED, it also has the ability to surpass miniLED. The brightness performance is the best choice for displaying HDR images.

At the same time, thanks to the principle of internal double-layer OLED stacking display, Tabdem OLED has a longer service life than traditional OLED. Although Tabdem OLED currently has disadvantages in terms of cost and yield, I believe that more and more manufacturers will choose Tabdem OLED screens in the future. After continuous iteration and polishing, the cost and yield issues will be greatly improved.

Many domestic screen manufacturers that have already laid out Tabdem OLED production lines will surely take the lead in future competition.

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