Apple's iPhone 13 Pro should make you care about LTPO displays

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NS iphone 13 pro model are the first Apple smartphones to use Promotion feature to help graphics and text slide fluidly when you are scrolling. That means now is a great time to learn about the screen technology called LTPO that enables it.

LTPO stands for Low Temperature Polycrystalline Oxide. This translates to better battery life on mouthful premium mobile devices. LTPO allows you to refresh the display on high-rate videogames by scrolling through your social media or swiping up to change apps. But for static information like e-book text, LTPO can slow refresh rates to save battery power.

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Feather iPhone 13 Pro and Pro Max, LTPO 10 times per second (10Hz) enables ProMotion’s ability to dial screen refresh rates between 120Hz. “Promotions produce faster frame rates when you need them and preserve battery life when you don’t,” Apple marketing chief Greg Joswiak said on Tuesday. iphone 13 launch event.

Apple isn’t the first phone maker to use LTPO. Samsung Galaxy Note 20 Ultra, Galaxy Z Fold 2 and Galaxy S21 Ultra; Oppo’s Find X3 Pro; And the OnePlus 9 Pro takes advantage of all the technology. LTPO is also built into some Apple Watch displays.

Here’s a look at what LTPO is and how it works.

Why would you want LTPO?

One way to make smartphones better these days is with higher refresh rates which make the screen recolor faster. The typical rate is 60 times per second (60 Hz), but higher refresh rates can reach 90 Hz or 120 Hz. Quick refresh rates make for easy scrolling and help keep games looking their best. But higher refresh rates require a lot of power, which is why many phones that support it allow users to disable it for better battery life.

LTPO helps by brilliantly adjusting both high and low frame rates which top out at one screen refresh per second for super high efficiency. Together an earlier technology called LTPS, short for low-temperature polysilicon, exhibits flicker at low refresh rates.

“If you want a phone with a high refresh rate, this is the way,” Ross Young Display of Supply Chain About LTPO “Otherwise it is going to cost you in terms of power.”

Apple didn’t say specifically whether it’s using LTPO, but it’s the only way to deliver Promotion’s capabilities on the iPhone, Young said.

What exactly is LTPO?

LTPO is a new way to build the backplane, which is one of the key layers of digital displays. The backplane contains thousands of transistors, tiny on-off switches that control how pixels on an adjacent layer in the display generate light.

LTPO A”best of both worlds“The approach to a backplane that performs well when the transistor is on and off. It combines three benefits: higher resolution, an adjustable refresh rate, and “ultra-low power consumption,” said strategy analytics Analyst Jeffrey Matthews. But it comes with a 5% to 10% price premium.

What it does not replace is a display’s separate system for producing light, for example backlit light-emitting diodes (LEDs) or active matrix organic light emitting diodes (AMOLEDs). So don’t be surprised to hear phone makers saying that they are using both AMOLED and LTPO.

Why is Apple interested in the LTPO?

The LTPO is a great match for Apple’s Promotion Display technology, which offers variable refresh rates that can reach up to 120Hz. Apple has already offered ProMotion on some iPads and several analysts, including David Hsieh Omedia had expected to see LTPO on the iPhone 13 Pro months before its launch.

Apple already has LTPO experience with the Apple Watch. The company was the first to use LTPO apple watch series 4 It becomes important in 2019 apple watch series 5Allows for ultraslow refresh rates for the always-on watch face that doesn’t sacrifice much battery life. Apple has some LTPO patents.

But Young was a little disappointed with Apple’s iPhone 13 Pro approach. “As a display geek, I was surprised that the Pro models didn’t come down to 1Hz like the OnePlus 9 Pro,” he said. Apple likely wasn’t due to problems with flicker below 10Hz, but “hopefully this will be resolved soon and implemented next year,” he said.

Apple did not respond to a request for comment.

apple watch series 5

The Apple Watch Series 5 uses an LTPO display that slowly refreshes once per second to save battery power.

What about LTPO tablets, laptops and TVs?

Young expects LTPO in tablets and eventually laptops, as display manufacturers embrace the technology. “A lot of fabs are converting or adding LTPO capacity over the next few years,” he said.

But don’t expect LTPO in the big display. Crystalline requirements mean that larger sizes are not economical compared to amorphous silicon (Therefore) layers that are used in larger displays. Plus, the TVs are plugged in, so the battery life isn’t of any use to justify the LTPO’s higher price.

Who Makes LTPO Displays?

Samsung Display supplies LTPO screens for phones, while LG Display and Japan Display make them for smartwatches. Mathews says there are many more suppliers coming, including Sharp in Japan and BOE, Visionox, TCL CSOT, Everdisplay and Tianma in China.

How much power does LTPO save?

LG Display reported a 71% power savings when dropping from a 60Hz refresh rate to 1Hz, and Sharp said that power usage on its LTPO displays fell 67% when going from 120Hz to 1Hz, Young said of the companies’ research findings. Said about

This is a huge drop, especially since displays are the biggest users of battery power in phones. But the display only turns on when you are using the phone, so LTPO won’t give you triple the battery life. And you’ll get different power savings depending on how you use your phone. Reading e-books with static pages can use a very low refresh rate most of the time, but playing graphically intense games requires a high refresh rate. And the actual savings will depend on the software and power management hardware that can quickly change the refresh rate under different conditions.

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