With the emergence of a full screen, the issue of unlocking the phone has again become the focus of attention, the screen crowding the front of the space after the fingerprint on the back is a lot of manufacturers of choice, to later have a face unlock and screen fingerprint unlock, only to solve the unity of the back and the front to unlock the contradiction between.
However, there is a choice between face unlocking and screen fingerprint unlocking, many phones now support face unlock, but this is just the front camera to join a function, belongs to two-dimensional, security is significantly lower than the fingerprint;
And the high security of the 3D structure light cost is very high, so screen fingerprint unlock become a lot of manufacturers choice, because it takes into account the security and cost, most importantly, in the experience without the user to make any changes, so that the screen unlock as if it is born for a full screen. In fact, the capacitive fingerprint and screen fingerprint unlock belong to a large class of fingerprint unlocking, mainly including capacitance, optics and ultrasonic three solutions.
And optics is now a popular screen fingerprint.
At present, screen fingerprints also need to rely on a very important ' auxiliary ' to achieve: OLED screen, since the screen is called fingerprint, so the screen is one of the most important factor, and the use of OLED screen is mainly due to its spontaneous light and thin enough two properties. The principle of screen fingerprint is to rely on the OLED screen self-illumination characteristics when our finger presses the screen fingerprint area to unlock the phone, the OLED screen glows to illuminate the finger fingerprint, then the fingerprint reflected by the light signal through the screen (the OLED screen is thin enough so that the light signal can be better through) to reach the image sensor below the screen,
After processing the calculation, to determine whether the fingerprint matching, so as to achieve the unlock. Oppo recently released R17 is a good example of the use of this principle, R17 with a light-sensing screen fingerprint, the first to use the CMOS scheme and Microlens micro-lens, with 3P lens, can be greatly improved into the light.
Moreover, R17 's light sense screen fingerprint image sensor size reached 2mm*2mm, the unit pixel size of 12.5um, the resolution reached 160*160, three indicators are the industry's top standards, the final oppo R17 of the screen unlock speed reached 0.41s, completely non-transmission capacity fingerprint unlock speed.
In achieving the ideal unlocking speed, Oppo expands the application range of the light-sensing screen fingerprint, in addition to the unlock also support Alipay/WeChat payment, application encryption and so on.
Many people may also ignore a point, that is, the film will actually affect the screen fingerprint, because one of the features of the OLED screen is because it is thin enough, light can be better penetration, if coupled with a layer of film will inevitably affect the unlocking experience. At this point, Oppo thought, after a series of tests finally selected a polarization direction but the hardness of more energy to do 2.5D process of the film material, through the cutting process to upgrade, so that the polarization of the film and the direction of polarization of the screen is consistent with the polarization of the light, to solve the problem of the refraction of radiation, oppo it called '
Optical fingerprint film ', the phone will be posted at the factory.
With the emergence of a full screen, the issue of unlocking the phone has again become the focus of attention, the screen crowding the front of the space after the fingerprint on the back is a lot of manufacturers of choice, to later have a face unlock and screen fingerprint unlock, only to solve the unity of the back and the front to unlock the contradiction between.
However, there is a choice between face unlocking and screen fingerprint unlocking, many phones now support face unlock, but this is just the front camera to join a function, belongs to two-dimensional, security is significantly lower than the fingerprint;
And the high security of the 3D structure light cost is very high, so screen fingerprint unlock become a lot of manufacturers choice, because it takes into account the security and cost, most importantly, in the experience without the user to make any changes, so that the screen unlock as if it is born for a full screen. In fact, the capacitive fingerprint and screen fingerprint unlock belong to a large class of fingerprint unlocking, mainly including capacitance, optics and ultrasonic three solutions.
And optics is now a popular screen fingerprint.
At present, screen fingerprints also need to rely on a very important ' auxiliary ' to achieve: OLED screen, since the screen is called fingerprint, so the screen is one of the most important factor, and the use of OLED screen is mainly due to its spontaneous light and thin enough two properties. The principle of screen fingerprint is to rely on the OLED screen self-illumination characteristics when our finger presses the screen fingerprint area to unlock the phone, the OLED screen glows to illuminate the finger fingerprint, then the fingerprint reflected by the light signal through the screen (the OLED screen is thin enough so that the light signal can be better through) to reach the image sensor below the screen,
After processing the calculation, to determine whether the fingerprint matching, so as to achieve the unlock. Oppo recently released R17 is a good example of the use of this principle, R17 with a light-sensing screen fingerprint, the first to use the CMOS scheme and Microlens micro-lens, with 3P lens, can be greatly improved into the light.
Moreover, R17 's light sense screen fingerprint image sensor size reached 2mm*2mm, the unit pixel size of 12.5um, the resolution reached 160*160, three indicators are the industry's top standards, the final oppo R17 of the screen unlock speed reached 0.41s, completely non-transmission capacity fingerprint unlock speed.
In achieving the ideal unlocking speed, Oppo expands the application range of the light-sensing screen fingerprint, in addition to the unlock also support Alipay/WeChat payment, application encryption and so on.
Many people may also ignore a point, that is, the film will actually affect the screen fingerprint, because one of the features of the OLED screen is because it is thin enough, light can be better penetration, if coupled with a layer of film will inevitably affect the unlocking experience. At this point, Oppo thought, after a series of tests finally selected a polarization direction but the hardness of more energy to do 2.5D process of the film material, through the cutting process to upgrade, so that the polarization of the film and the direction of polarization of the screen is consistent with the polarization of the light, to solve the problem of the refraction of radiation, oppo it called '
Optical fingerprint film ', the phone will be posted at the factory. Millisecond unlock smooth experience OPPO R17 Optical screen fingerprint analysis
