SUBSTRATE FOR FINGERPRINT CONTACT

• US 20130051635A1
• Filed: 02/13/2012
• Published: 02/28/2013
• Est. Priority Date: 08/24/2011
• Status: Active Grant

• Current Assignee: Gingy Technology Inc.
• Original Assignee: Gingy Technology Inc.
• Inventors: WU, Chien-Hsing, CHOU, Jung-Tsung
• Granted Patent: US 8,649,001 B2
• Time in Patent Office: Days
• US Class Current: 382/124
• CPC Class Codes: G06V 40/1324 by using geometrical optics, e.g. using prisms G06V40/1312 takes precedence

Abstract

A substrate for fingerprint contact includes a plate, and the plate includes a first surface and a second surface. The first surface is an optical diffusing surface. The optical diffusing surface is used for being contacted by a finger, and features hazed particles. The second surface faces an optical imaging system. The optical diffusing surface of the plate helps to enhance light to be evenly emitted to the finger and weakens the unnecessary scattered light to the optical imaging system, so as to enhance the recognition rate of a fingerprint when the optical imaging system is used for intercept the light applied on a finger.

Claims

1. A substrate for fingerprint contact, comprising a plate, wherein the plate has a first surface and a second surface, the first surface is opposite to the second surface, the first surface is an optical diffusing surface, the optical diffusing surface is used for being contacted by a finger, and the second surface faces an optical imaging system.

2. The substrate for fingerprint contact according to claim 1, wherein the optical imaging system comprises at least one light emitting element and a sensing element, the light emitting element is used for emitting light to the plate, and the sensing element faces the plate and is used for capturing a fingerprint pattern of the finger transmitted by the light through the finger.

3. The substrate for fingerprint contact according to claim 2, wherein the optical diffusing surface is a surface featuring hazed particles formed by a Ultra-Violet Coating (UV Coating) or a mold discharging process, and the haze of the optical diffusing surface ranges from 85% to 95%, when the light emitting element transmits the light to the optical diffusing surface, the scattering of the light is enhanced, and when the light contacts the finger, the optical diffusing surface helps to weaken the scattering of the light.

4. The substrate for fingerprint contact according to claim 2, further comprising a microstructure disposed on the second surface, wherein the microstructure is used for making the light evenly emitted to the plate after passing through the microstructure.

5. The substrate for fingerprint contact according to claim 2, wherein the optical imaging system further comprises a diffusing plate, disposed between the light emitting element and the plate, and used for making the light evenly emitted to the plate after passing through the diffusing plate.

6. A substrate for fingerprint contact, comprising:

a plate, having a first surface and a second surface, wherein the first surface is opposite to the second surface, and the second surface faces an optical imaging system; and

a film, having an optical diffusing surface, wherein the film is attached to the first surface of the plate through the optical diffusing surface so the optical diffusing surface is located between the plate and the film, and another surface of the film far away from the optical diffusing surface is used for being contacted by a finger.

7. The substrate for fingerprint contact according to claim 6, wherein the optical imaging system comprises at least one light emitting element and a sensing element, the light emitting element is used for emitting light to the plate, and the sensing element faces the plate and is used for capturing a fingerprint pattern of the finger transmitted by the light through the finger.

8. The substrate for fingerprint contact according to claim 7, wherein the optical diffusing surface of the film is a surface featuring hazed particles formed by a Ultra-Violet Coating (UV Coating) or a mold discharging process, and the haze of the optical diffusing surface of the film ranges from 85% to 95%, when the light emitting element transmits the light to the optical diffusing surface of the film, the scattering of the light is enhanced, and when the light contacts the finger, the optical diffusing surface helps to weaken the scattering of the light reflected by the finger.

9. The substrate for fingerprint contact according to claim 7, wherein the optical imaging system further comprises a diffusing plate, disposed between the light emitting element and the plate, and used for making the light evenly emitted to the plate after passing through the diffusing plate.