Only OLED is suitable for a full screen? After reading this article I understand
Since the second half of 2017, the mobile phone industry has set off a wave of full screens. Whether it is an international giant brand such as Samsung, or many domestic mobile phone brands, it seems that they have entered the era of full screen overnight. Apple once claimed that the 3.5-inch screen is the best size for mobile phones, but under the trend of large-screen mobile phones, as well as technology accumulation and design evolution, this year's iPhone X ushered in a breakthrough innovation - 5.8 inch full screen.
· Don't use OLED to do a full screen?
The panels used in all current full-screen mobile phones fall into two categories: TFT-LCD and OLED. Most manufacturers have adopted a full-screen LCD, and due to the monopoly of technology and low production capacity of OLED screens, it is difficult for each manufacturer to obtain supply from the upstream, even if it can be obtained is also a very small amount. Currently, South Korea's LG and Samsung are the only large-scale manufacturers of OLED panels. LG is focusing on large-size panels, and Samsung has been working on small-size OLED screens.
Why is OLED more suitable for a full screen?
Although the mainland-based panel maker BOE officially announced the mass production of flexible AMOLED screens in October this year, it may be difficult to catch up with Samsung in a short period of time. Samsung can now say that it has monopolized the market for small-sized OLED panels and holds more than 90% of the entire market, with annual production capacity of several hundred million. In front of Samsung, Apple can only choose to admire, making it the exclusive supplier of iPhone X's OLED panel.
iPhone X chooses an expensive OLED screen with only one vendor
As an Apple 10th Anniversary Edition model, iPhone X did not choose a full-screen LCD, but chose a more expensive and only one supplier of OLED full screen. The essential difference between LCD and OLED is that LCD needs backlight support, and OLED can self-luminous, which is the biggest difference between the two, and it is also a decisive factor in determining the display effect and screen thickness of the two screens.
True curved screen only OLED can do
Due to the self-luminous characteristics, OLEDs have a higher energy efficiency than LCD screens and do not emit light when displayed black. Also thanks to the simple structure of the OLED, the body can also be made thinner. iPhone X through OLED so that "bangs" and the screen got a better fit; Samsung S8 also achieved a curved screen through OLED, access to the highest screen share of all mobile phones. The LCD's full screen always feels almost like the real “fullâ€.
· The future full screen will become the standard mobile phone
The trend of full screen outbreak in the smart phone market is inseparable from the development of the Internet. With the proliferation of ultra-high-speed 4G and the coming 5G networks, smart phones have become the main source of equipment for content creation and product consumption, which has also contributed to people’s The pursuit of the big screen. In order to meet the needs of the user's large screen, mobile phone manufacturers often choose to increase the size of the phone to achieve, and when the size of the phone increases to the palm and pocket size constraints, manufacturers naturally began to pursue screen share.
All major mobile phone manufacturers are pursuing a screen share
The concept of a full screen was first proposed at the launch of the Xiaomi MIX last year. At the time, Xiaomi's comprehensive screen used three extremely narrow designs, and even abandoned distance sensing holes and speaker openings. Placed under the fuselage, this also makes it have an amazing screen share. Then Samsung gave another answer, using a curved screen design with narrow upper and lower sides, through the OLED surface design so that both sides even reached the borderless effect.
Full screen is more impactful than ordinary screen visuals
Have to admit that the full-screen than ordinary screen visual effects more impact, the display is also more amazing. The current 18:9 curved screen mobile phone makes the body look more slender, the grip is also more excellent. At the same time thanks to the design of a full-screen, mobile phones also have a larger display area. A full screen allows the phone to be smaller with the same screen size, or with a larger screen.
BOE Chengdu Sixth Generation Line is China's first flexible OLED production line
With Samsung, LG Display, BOE, Tianma, JDI and many other upstream manufacturers, regardless of the improvement and improvement of full-screen technology, a more mature 18:9 full-screen mobile phone solution has emerged, and domestic brands such as Huawei and Jin Li have adopted this. A full-screen solution, Jin Li said that all of its mobile phone products will use a full screen. At this point, the full screen has become a standard configuration option for mobile phones and is expected to be universally available.
·The current full screen still can't do fingerprint recognition under the screen
In the past few months, many people have been waiting for the fingerprint recognition technology under the screen to not appear in the Apple 10th Anniversary Edition model. This also means that iPhone X users must be accustomed to unlocking new types of face recognition. the way. Compared to occupying the space above the screen to place cameras and other components to do face recognition, this is why the iPhone X has a “bangs†design. The benefit of the fingerprint under the screen is to ensure the integrity of the screen. The mobile phone can be directly attached to the screen. Identify and unlock.
iPhone X uses face recognition to unlock
From the technical principle of fingerprint recognition, optical, capacitive, thermal and ultrasonic are four common fingerprint identification methods. On cell phones or some tablet devices, the lightweight, low-cost capacitive modules are the first choice for most consumer electronics manufacturers. Today's capacitive fingerprint sensor has a very good unlocking speed. It only takes 0.15-0.2 seconds to apply a finger to enter the main screen. It is almost impossible to feel the waiting time for everyday use.
Optical, capacitive, thermal, and ultrasonic are four common fingerprint identification methods
However, capacitive sensing also has the fatal drawback that it cannot recognize fingerprints on the screen across the screen. This is mainly because the thickness of the screen module itself causes the sensor not to collect enough signals. To unlock the fingerprint under the screen, you can only use the optical and ultrasonic solutions with stronger penetrating power.
·OLED is the best solution for fingerprint identification under the screen
This year, Shenzhen Huiding Technology launched the first screen-based fingerprint identification technology based on optical solutions. This technology uses an optical fingerprint sensor placed under the OLED screen to actively emit invisible structured light to identify fingerprint lines on the screen. Also this year, Vivo also demonstrated an under-the-screen fingerprinting prototype based on the Qualcomm ultrasound solution, which still uses OLED screens.
The Achilles' heel of Capacitive Sensing is the Inability to Understand Fingerprint Identification
OLED screen is the best solution for fingerprint unlocking under the screen because of its simple structure
The reason why the two solutions all use OLED screens is mainly due to the fact that the module thickness of OLED screens is smaller than that of LCD screens of the same specifications. Whether it is optical sensing or ultrasonic penetration, the data loss will be less and the response speed will naturally be lower. Faster. So whether it is Samsung or Apple in the future, if anyone can be the first to introduce fingerprint recognition technology under the screen, it will certainly use OLED screens.
· It is not impossible to fold a full-screen mobile phone
Another feature of OLED screens is their ability to display flexible displays. Of course, these may still be far from us, and they are not very practical. However, as the mobile phone screen becomes bigger and bigger, the proportion of the screen becomes higher and higher, and the mobile phone capable of folding the screen is also a good choice.
Full screen folding only OLED screen can be achieved
At present, Apple has applied for a patent for a foldable OLED screen, and joint research and development with BOE. Maybe in the near future, an iPhone with an OLED full screen and a foldable iPhone will be born? If Apple can develop folding displays before competitors, then Apple will return to the forefront of phone and technology innovation, even if face recognition technology (Face ID) face recognition technology has lagged behind.
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