Optical sensing module, optical sensing and image capturing architecture, and method for optically scanning fingerprints with a portable communications system

• US 20060082760A1
• Filed: 08/30/2005
• Published: 04/20/2006
• Est. Priority Date: 10/15/2004
• Status: Abandoned Application

• Current Assignee: Lite-On Semiconductor Corporation (Lite-On Technology Corporation)
• Original Assignee: Lite-On Semiconductor Corporation (Lite-On Technology Corporation)
• Inventors: Lin, Chih-Neng
• Application Number:
  US11/213,814
• Publication Number:
  US 20060082760A1
• Time in Patent Office: Days
• US Class Current: 356/71
• CPC Class Codes: G06V 40/1318 using electro-optical elements or layers, e.g. electroluminescent sensing

Abstract

An optical sensing module, an optical sensing and image capturing architecture, and a method for optically scanning fingerprints with a portable communications system are applied to a mobile phone to capture a group of images of a fingerprint on a finger of the user holding having the mobile phone. The optical sensing module has a light permeable device, at least one light source, and a sensing device. The sensing device has a plurality of sensors that form a line array of sensors. The optical sensing and image capturing architecture has the above optical sensing module and an image output unit. The volume of the optical sensing module is reduced for facilitating installation in the portable communications system, for fragmentally capturing a group of images of the fingerprint, and for processing of identification of the fingerprint.

Claims

1. An optical sensing module of a portable communications system for capturing a group of images of a 3-D surface of a sensed object, comprising:

a light permeable device having a light-in face, a reflection face, and a light-out face;

at least one light source arranged adjacent to the light-in face of the light permeable device; and

a sensing device arranged adjacent to the light-out face of the light permeable device, the sensing device having a plurality of sensors forming a line array of sensors corresponding to the light-out face;

wherein

the sensed object is movable and placed on the reflection face, light of the at least one light source is projected into the light-in face and transmitted to the reflection face, the 3-D surface of the sensed object on the reflection face reflects light to the light-out face, and light is focused on the line array of sensors, wherein the line array of sensors fragmentally captures a group of images of the 3-D surface of the sensed object.

2. The optical sensing module as claimed in claim 1, wherein the portable communications system is a mobile phone or a personal digital assistant.

3. The optical sensing module as claimed in claim 1, wherein the sensed object includes a fingerprint.

4. The optical sensing module as claimed in claim 1, wherein the light permeable device has a plurality of convergent lenses disposed on the light-out face and forming a line array of lenses.

5. The optical sensing module as claimed in claim 4, wherein the light permeable device is a line-type prism, and the convergent lenses are integrally formed on the light-out face in one piece.

6. The optical sensing module as claimed in claim 4, wherein the light permeable device is a line-type prism, and the convergent lenses are assembled on the light-out face.

7. The optical sensing module as claimed in claim 1, wherein the line array of sensors is a 1×

M 2-D array, and the number M is a positive integer.

8. The optical sensing module as claimed in claim 1, wherein the line array of sensors is a 1×

192 2-D array.

9. The optical sensing module as claimed in claim 1, wherein the line array of sensors is an N×

M 2-D array, the number N and the number M are positive integers, and the 2-D array has an area smaller than that of the 3-D surface of the sensed object.

10. The optical sensing module as claimed in claim 1, wherein the line array of sensors is a 3×

192 2-D array.

11. The optical sensing module as claimed in claim 1, wherein each of the sensors has a width smaller than that of a ridge portion and that of a valley portion of the 3-D surface of the sensed object.

12. An optical sensing and image capturing architecture of a portable communications system for capturing a group of images of a 3-D surface of a sensed object, comprising:

a light permeable device;

at least one light source;

a sensing device having a plurality of sensors forming a line array of sensors; and

an image output unit;

wherein

the sensed object is movable and placed on the light permeable device, light of the at least one light source is projected into the light permeable device, the 3-D surface of the sensed object reflects light, light is focused on the line array of sensors that fragmentally captures a group of images of the 3-D surface of the sensed object to obtain a plurality of fragmental sensed images, and the image output unit integrates the fragmental sensed images into a serial or a parallel information form for output.

13. The optical sensing and image capturing architecture as claimed in claim 12, wherein the line array of sensors is a 1×

M 2-D array, the number M is a positive integer, and the sensing device includes a horizontal scanning circuit for controlling analog signals of the fragmental sensed images for output.

14. The optical sensing and image capturing architecture as claimed in claim 12, wherein the line array of sensors is an N×

M 2-D array, the number N and the number M are positive integers, and the sensing device includes a horizontal scanning circuit, a vertical scanning circuit, and a timing control circuit for controlling analog signals of the fragmental sensed images for output.

15. The optical sensing and image capturing architecture as claimed in claim 12, comprising a signal amplifier for amplifying analog signals of the fragmental sensed images.

16. The optical sensing and image capturing architecture as claimed in claim 15, comprising a transforming interface for transforming the analog signals into digital signals to the image output unit.

17. A method for optically scanning fingerprints with a portable communications system, comprising:

providing an optical sensing module of a portable communications system, wherein the optical sensing module includes a sensing device having a plurality of sensors forming a line array of sensors; and

placing and moving a fingerprint on the optical sensing module, wherein the line array of sensors fragmentally captures a group of images of the fingerprint to obtain a plurality of fragmental images of the fingerprint.

18. The method for optically scanning fingerprints as claimed in claim 17, wherein the optical sensing module includes a light permeable device and at least one light source, the fingerprint is placed and moved on the light permeable device, light of the at least one light source is projected into the light permeable device, the fingerprint reflects light, and light is focused on the line array of sensors to obtain a plurality of fragmental images of the fingerprint.

19. The method for optically scanning fingerprints as claimed in claim 17, further comprising providing a signal amplifier, a transforming interface, and an image output unit, wherein the signal amplifier amplifies analog signals of the fragmental images of the fingerprint, the transforming interface transforms the analog signals into digital signals to the image output unit, and the image output unit integrates the fragmental images of the fingerprint into a serial or a parallel information form for output.