A miniature complementary lighting system for an under-screen fingerprint identification module

Abstract

The invention provides a miniature complementary lighting system for an under-screen fingerprint identification module. The miniature complementary lighting system is located between a light guide plate of a liquid crystal screen and an imaging module for fingerprint identification, and is used for supplementing the illumination of the liquid crystal screen and eliminating black spots on the liquid crystal screen caused by holes in the light guide plate. The miniature supplemental lighting system comprises more than two LED light sources symmetrically distributed with the imaging module as thecenter and a folded optical path assembly composed of more than two reflecting surfaces. The light emitted from the LED light source is reflected and mixed for many times by means of the folded lightpath assembly, and the mixed light uniformly illuminates the liquid crystal screen above. As that light guide plate assembly is open and the light guide lines are partially cancel, the black spots onthe mobile phone display screen can be eliminated, the light distribution is basically the same as that of other positions of the liquid crystal screen, and the lower skin of the fingerprint can be illuminate.

Description

technical field [0001] The invention relates to fingerprint identification technology, in particular to a miniature supplementary light lighting system (that is, a miniature supplementary backlight lighting system) used for an under-screen fingerprint identification module. Background technique [0002] Recently, due to the wide application of full-screen mobile phones, more and more mobile phones have adopted the fingerprint recognition module under the screen. Most of the currently popular off-screen fingerprint recognition modules on the market are capacitive fingerprint sensor components, which use silicon wafer microarrays and conductive subcutaneous electrolytes to form an electric field. There are different changes in the difference, whereby accurate fingerprint determination can be achieved. However, since the surface of the sensor is made of silicon material, it is easily damaged, resulting in a reduced service life. And the fingerprint image is formed by the groo...

AI Technical Summary

Problems solved by technology

OLED screens consume a lot of power when displaying images with a white background (such as documents or websites)

Another disadvantage is the burn-in problem: due to the difference in the display of each pixel on the screen, the aging speed of each location is different

Then, since the opening position of the light guide plate cannot illuminate the LCD display directly above, an obvious black spot will appear on the display of the mobile phone.

[0005] For this reason, how to solve the black spots on the display screen caused by the opening of the light guide plate has become an urgent problem to be solved in the current fingerprint recognition technology under the screen.

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