Huawei Honor 7 - Why Does It Takes a Long Time to Unlock the Screen after My Phone Has Been Used for a Certain Period

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This problem is normally observed during cold periods when the finger's skin is susceptible to
peeling, causing temporary changes in the shape of your fingerprint. In addition, the
fingerprint sensor may also not work properly late at night or when you wake up in the
morning due to changes in the depth of fingerprint ridges caused by dry fingers and slow
circulation.
1. Check whether the skin on your finger is dry, peeling or damaged.
The fingerprint sensor is designed to work at temperatures ranging from –20℃ to +75℃.
Solutions:
Use another finger.
Use skincare products to keep your skin moist and prevent it from peeling or cracking.
If you are suffering from dry skin, exercising or using warm water to wash your hands can
help to relieve the problem.
2. Check whether the surface of the fingerprint sensor is dirty and clean it if necessary.
3. If the fingerprint sensor is still not working properly, check whether your phone vibrates
when you use the sensor. If so, this means that your phone did not recognize your fingerprint
and the screen was not unlocked.
Solutions:
Try to cover the whole of the fingerprint sensor with your fingertip.
You can record 6 images for each fingerprint - two for the center of each fingerprint (the most
commonly used part) and 4 for the surrounding areas. The greater the surface area you record,
the greater the accuracy of the fingerprint sensor. Try registering your fingerprint again
following the steps above. When registering your fingerprint, avoid using the same area of
your finger for each of the 6 images.
17.12.2 Why does it takes a long time to unlock the screen after
my phone has been used for a certain period?
1. Your fingers may become dry in autumn and winter. In this case, you can press your finger
against the fingerprint sensor more strongly and keep your finger moderately humid by
blowing hot air to it or washing it.
2. The blood circulation speed decreases when you sleep and the fingerprint pattern gets
shallower. Even though the fingerprint characteristics remain unchanged, it may feel smoother.
In this case, you need to press harder.
3. The working temperature of the fingerprint sensor is from –20°C to +75°C .
17.12.3 Why does my phone fail to read my fingerprint?
1. Your phone may fail to read your fingerprint if your finger is too dry, sweaty, wet, or has
obstacles. Wipe your finger and try again. If your fingers are dry, you may need to press your
finger against the sensor more strongly.
2. You can try enrolling your fingerprint again. While you are enrolling your fingerprint, use
the gesture you often use, enroll your fingerprint areas as many as possible, and avoid
enrolling the same area of your fingerprint, so that the enrolled fingerprint image will be
consistent with that read by your phone when you press your finger against the fingerprint
sensor.