Slim type fingerprint recognition device using contact light emitting device and thin film transistor fingerprint input device

• US 20030183019A1
• Filed: 07/16/2002
• Published: 10/02/2003
• Est. Priority Date: 03/29/2002
• Status: Active Grant

• Current Assignee: Ib Korea Ltd.
• Original Assignee: Testech, Inc.
• Inventors: Chae, Sang Hoon
• Granted Patent: US 6,688,186 B2
• Time in Patent Office: Days
• US Class Current: 73/862.624
• CPC Class Codes: G06V 40/1318 using electro-optical elements or layers, e.g. electroluminescent sensing
• CPC Class Codes: G07C 9/247 electronically, e.g. by comparing signal of hand-writing with a reference signal from the pass
• CPC Class Codes: H01L 27/12 the substrate being other than a semiconductor body, e.g. an insulating body
• CPC Class Codes: H01L 27/14643 Photodiode arrays; MOS imagers
• CPC Class Codes: H01L 27/14678 Contact-type imagers
• CPC Class Codes: H01L 29/78633 with a light shield

Abstract

The present invention discloses a slim type fingerprint recognition device including: a TFT fingerprint input device having a structure where a plurality of unit cells including an light sensing unit and a switching unit are aligned; and a contact light emitting device being installed on the TFT fingerprint input device, the TFT fingerprint input device and the contact light emitting device being adhered to each other by an adhesive layer, one alternating current terminal being connected to a transparent electrode layer of the contact type light emitting device.

Claims

1. A slim type fingerprint recognition device comprising:

a TFT fingerprint input device having a structure where a plurality of unit cells including an light sensing unit and a switching unit are aligned; and

a contact light emitting device being installed on the TFT fingerprint input device, the TFT fingerprint input device and the contact light emitting device being adhered to each other by an adhesive layer, one alternating current terminal being connected to a transparent electrode layer of the contact type light emitting device.

2. The slim type fingerprint recognition device in accordance with claim 1, wherein the adhesive layer is prepared by mixing 55 to 60 wt % of epoxy adhesive (Araldite), 5 to 10 wt % of polyvinyl butyral paste, 1 to 5 wt % of ethylene glycol monoethyl ether acetate, 1 to 5 wt % of n-butyl glycidyl ether, 1 to 5 wt % of defoamer, and 1 to 4 wt % of retardant.

3. The slim type fingerprint recognition device in accordance with claim 1, wherein the device further comprises a light shielding pattern film which is a black film pattern aligned on the top surface of the TFT fingerprint input device, the black pattern being opened only a light incidence layer, thereby capable of transmitting light to the light incidence layer.

4. The slim type fingerprint recognition device in accordance with claim 1, wherein the device further comprises a polarizing layer passes vertical incident light between the TFT fingerprint input device and the contact light emitting device.

5. The slim type fingerprint recognition device in accordance with claim 1, wherein the light sensing unit of the TFT fingerprint input device comprises:

a light incidence layer received incidence light from a light emitting device;

a drain and a source electrode connected to both sides of the light incidence layer;

an insulation layer formed on the surface of the drain and source electrode; and

a light shielding layer formed on the insulating layer except an opening unit for exposing the light incidence layer;

whereby the emitted image(light) of the contact light emitting device is reached only to the light incidence layer by limitation of the light shielding layer.

6. A slim type fingerprint recognition device using a contact type light emitting device and a TFT fingerprint input device, comprising:

the TFT fingerprint input device having a structure where a plurality of unit cells including an light sensing unit and a switching unit are aligned; and

the contact light emitting device installed on the TFT fingerprint input device,

wherein the contact light emitting device comprises;

a transparent electrode layer directly deposited on the TFT fingerprint input device in a thin film type;

one alternating current terminal being connected to the transparent electrode layer;

a light emitting layer formed on the transparent electrode layer;

a light shielding layer formed on the light emitting layer;

a dielectric layer formed on the light shielding layer; and

a water repellent layer (abrasion-resistant film) formed on the dielectric layer, wherein the transparent electrode layer of the contact light emitting device is deposited on the top surface of the TFT fingerprint input device and then the light emitting layer, the light shielding layer, a dielectric layer and the water repellent layer(abrasion-resistance film) are sequentially deposited.

7. The slim type fingerprint recognition device in accordance with claim 6, wherein the device further comprises a polarizing layer passes vertical incident light between the TFT fingerprint input device and the contact light emitting device.

8. The slim type fingerprint recognition device in accordance with claim 6, wherein the polarizing layer is formed by depositing on the top surface of the TFT fingerprint input device.

9. The slim type fingerprint recognition device in accordance with claim 6, wherein the polarizing layer is adhered on the top surface of the TFT fingerprint input device by an Epoxy-type adhesive.

10. The slim type fingerprint recognition device in accordance with claim 6, wherein the device further comprises a light shielding pattern film which is a black film pattern aligned on the top surface of the TFT fingerprint input device, the black pattern being opened only a light incidence layer, thereby capable of transmitting light to the light incidence layer.

11. The slim type fingerprint recognition device in accordance with claim 6, wherein the light sensing unit of the TFT fingerprint input device comprises:

a light incidence layer received incidence light from a light emitting device;

a drain and a source electrode connected to both sides of the light incidence layer;

an insulation layer formed on the surface of the drain and source electrode; and

a light shielding layer formed on the insulating layer except an opening unit for exposing the light incidence layer;

whereby the emitted image(light) of the contact light emitting device is reached only to the light incidence layer by limitation of the light shielding layer.