On-LCD screen optical fingerprint sensing based on optical imaging with lens-pinhole module and other optical designs
AssigneeShenzhen Goodix Technology Co., Ltd.
InventorsYi He, Bo Pi
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Abstract
Devices and optical sensor modules are provided for provide on-screen optical sensing of fingerprints by using an under-screen optical sensor module that captures and detects light from a fiber on top of the screen. Various implementations of the under-LCD optical sensor modules are provided, including different optical imaging module designs for under-LCD optical sensing, invisible under-LCD optical sensor modules based on concealing optical transmissive features or regions under the LCD opaque borders and optical sensing of topographical features associated with inner tissues of a finger.
Claims20
An optical sensor module for detect a fingerprint pattern of a finger placed above an LCD panel structure, the optical sensor module comprising:
- an optical sensor array of optical detectors for converting returned light carrying fingerprint information into detector signals representing a fingerprint pattern, wherein the returned light is generated when the finger is illuminated by probe light provided by an illumination probe light source, and the returned light is transmitted through the LCD panel structure;
- a pinhole structure for collecting the returned light and to transmit the returned light towards the optical sensor array, wherein the pinhole structure is configured to produce an increased optical field of view in collecting the returned light;
- and
- a lens unit located between the pinhole structure and the optical sensor array, the lens unit being configured to receive the returned light from the pinhole structure and to transmit the returned light onto the optical sensor array.
An electronic device capable of detecting a fingerprint by optical sensing, comprising:
- a liquid crystal display (LCD) screen that provides touch sensing operations and includes an LCD panel structure to display images;
- an illumination probe light source that produces probe light to illuminate a sensing area of the LCD panel structure for optical sensing;
- and
- an optical sensor module for receiving returned light that passes through the LCD panel structure for optical sensing, wherein the optical sensor module comprises:
- an optical sensor array of optical detectors for converting returned light carrying fingerprint information into detector signals representing a fingerprint pattern, wherein the returned light is generated when the finger is illuminated by the probe light, and the returned light is transmitted through the LCD panel structure;
- a pinhole structure for collecting the returned light and to transmit the returned light towards the optical sensor array, wherein the pinhole structure is configured to produce an increased optical field of view in collecting the returned light;
- and
- a lens unit located between the pinhole structure and the optical sensor array, the lens unit being configured to receive the returned light from the pinhole structure and to transmit the returned light onto the optical sensor array.
Dependencies are inferred from the claim text.