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Boe breach under LCD screen fingerprint!Supply chain pattern "big abrupt change" start?

date: 2019-08-28
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On July 2, boe answered the questions of shareholders through the interactive platform, saying that boe now has a variety of solutions for fingerprint and screen voice technology under the screen, and some of the solutions have corresponding samples, while the productized solutions are in continuous communication with terminal brand customers.


Last week, liu xiaodong, vice President of jd.com, also told the MWC 2019 global display summit in Shanghai that boe's optical fingerprint sensing technology under LCD screen has been successfully developed and will be mass-produced by the end of 2019.


On June 30th boe also introduced its under-screen fingerprinting technology for OLED displays, which USES the principle of 'pinhole imaging'.That is, when a finger is placed in the fingerprint-recognition area of the screen, the OLED layer emits light that can reach the fingerprint through the screen and be projected back on to a photosensitive sensor built into the display.Fingerprint features are processed by collimating optical modulation and image Mosaic software, and finally a digital fingerprint image which can be processed by fingerprint equipment algorithm is formed.


According to the reporter, the fingerprint image resolution of this scheme is up to 800PPI, which reaches the level of sweat hole identification accuracy, and the effective detection rate of false fingerprint is up to 99.3%.At the same time, it is also suitable for wet fingers, high and low temperature, strong light, screen film and other complex scenes.Moreover, since the optical modulation unit is integrated into the interior of the display screen, the thickness of the display screen is more than 50% lower than the design scheme of the external collimating optical circuit, thus making the device thinner and thinner.


The technology can only be used on OLED screens because of the thickness of the fingerprint under the optical screen and the fact that LCDS are opaque.But boe has now developed a fingerprint-sensing technology for LCD screens, which means phone makers can use the technology to make more cost-effective phones.


And, according to data shows, boe fingerprint scheme under the screen can also support the fingerprint identification, full screen hole imaging formation of the 'light' can be throughout the display, at the same time cover glass substrate in photosensitive sensor, so that the size of the sensor is not restricted, so it can support full screen under the screen of the fingerprint recognition and fingerprint payment function, etc.


The price difference between the current OLED panel and the LTPS LCD panel has dropped to less than $5, according to the data. Coupled with the promotion of the fingerprint technology under the screen, OLED has pressed the LTPS LCD panel across the board.However, at present, smart phones equipped with LCD display screen still occupy the majority of the market. According to statistics, the global shipments of smart phones reached 1.456 billion in 2018, and the LCD screen model alone accounted for 85%.


From this point of view, the traditional LCD screen still occupies the absolute mainstream of the market.The proliferation of full-screen phones has led to the launch of a number of phones with AMOLED screens.But AMOLED itself has its own defects, such as the biggest problem is the AMOLED after long time use will produce chemical degradation reaction, that is commonly known as the phenomenon of burn-in, when switch screen image, the display will be kept on a screen the ghosting, up to now the industry has yet to eradicate the problem solution, AMOLED screen affect user experience problems will continue.


Second, OLED screens need each pixel to glow on its own, and different colors of pixels have different lighting lives due to different materials, with blue pixels having the shortest lifespan.Common OLED pixel arrangements generally include Pentile arrangement (P row for short) and diamond arrangement.Although the styles are different, they all have only two pixels, and they need to use adjacent pixels to image properly, which will lead to the problem of color edge serrated images.


Finally, as oleds are often dimmed by PWM, they are dimmed by switching light sources on and off the screen quickly.Although the human eye can't see it, in slow motion, the screen flashes at a fixed frequency, which is particularly harmful to the human eye.In this case, the user's eyes will be more stimulated, and OLED screen features high contrast, OLED screen will have a big impact on vision.


Compared with the above problems in practical application of OLED display, LCD display can ensure the full display of sub-pixels by using RGB pixel array, and the imaging picture is natural. Meanwhile, there is no burning or flashing phenomenon.However, LCD also has many disadvantages. For example, the biggest disadvantage of LCD is that it cannot be made into curved screen, and it is inferior to OLED in black field performance.Moreover, LCD cannot light itself, so it needs to carry a backlight panel to make the screen light up, which makes the screen cannot be thinner, and the contrast is also lower, which makes it look more elegant than OLED.


However, with boe's technological breakthrough in fingerprint under LCD screen, and the company's own status as a big panel manufacturer, the editor believes that jd will have a better adjustment plan for fingerprint under LCD screen, which may have a great impact on the options of mobile phone manufacturers on display screen in the future.In addition, the biggest advantage is that LCDS are cheaper than oleds, so the editors predict that the market share of LCDS in mobile devices may rebound in the future.


At the same time, for some of the current professional in-depth screen fingerprint technology manufacturers, boe's move may cause a big impact on this quite mature market.After all, it used to be the end of the line with the sub-screen fingerprint chip manufacturers to customize the screen.Now, with boe's under-screen fingerprint technology becoming increasingly mature, big display manufacturers will have the opportunity to directly connect with terminal manufacturers across the under-screen fingerprint technology, thus expanding their voice in the industrial chain.(coordinating editor: Andy)


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