Liquid crystal display device performing both image display mode and fingerprint recognition mode

• US 20030174870A1
• Filed: 12/30/2002
• Published: 09/18/2003
• Est. Priority Date: 03/12/2002
• Status: Active Grant

• Current Assignee: BOE HYDIS Technology Company Limited (SK Hynix Inc.)
• Original Assignee: BOE HYDIS Technology Company Limited (SK Hynix Inc.)
• Inventors: Park, Kyu Chang, Kim, Choong Hoo, Shim, Min Soo
• Granted Patent: US 7,418,117 B2
• Time in Patent Office: Days
• US Class Current: 382/124
• CPC Class Codes: G02F 1/13312 Circuits comprising photodetectors for purposes other than feedback
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 1/1601 Constructional details related to the housing of computer displays, e.g. of CRT monitors, of flat displays constructional details related to flat displays integrated in a portable computer, e.g. laptop, handheld computer G06F1/1637; constructional details related to television receivers H04N5/64
• CPC Class Codes: G06F 2203/0339 Touch strips, e.g. orthogonal touch strips to control cursor movement or scrolling; single touch strip to adjust parameter or to implement a row of soft keys
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G06V 40/1318 using electro-optical elements or layers, e.g. electroluminescent sensing
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

Disclosed is a liquid crystal display device of novel construction, in which a fingerprint recognition device is integrally formed with the liquid crystal display device, thereby minimizing the increase in the price and size of a final product. The liquid crystal display device comprises an image display panel and a fingerprint recognition panel which are integrally formed, wherein the image display panel comprises a scan drive unit which sequentially turns on rows formed in the image display panel for each frame in order to display images, and a data drive unit which outputs data signals to a turned-on row provided in the image display panel, and wherein the fingerprint recognition panel comprises a switch control unit which sequentially turns on rows formed in the fingerprint recognition panel for each frame in order to perform fingerprint recognition, and a reading unit, to which fingerprint information recognized from a turned-on row is outputted.

Claims

1. A liquid crystal display device, capable of performing both image display mode and fingerprint recognition mode, wherein an image display panel and a fingerprint recognition panel are integrally formed,

wherein the image display panel comprises a scan drive unit which sequentially turns on rows formed in the image display panel for each frame in order to display images, and a data drive unit which outputs data signals to a turned-on row provided in the image display panel, and

wherein the fingerprint recognition panel comprises a switch control unit which sequentially turns on rows formed in the fingerprint recognition panel for each frame in order to perform fingerprint recognition, and a reading unit, to which fingerprint information recognized from a turned-on row is outputted.

2. The liquid crystal display device according to claim 1, wherein the fingerprint recognition panel is formed from an array of fingerprint recognition components, each of the fingerprint recognition components comprising:

a sensor thin film transistor, in which a photosensitive layer is formed between a drain and a source of the sensor thin film transistor, and when light exceeding a predetermined amount of light is incident into the photosensitive transistor, the drain and the source become electrically conductive; and

a switch thin film transistor, in which a gate of the switch thin film transistor is connected to the output terminal of the switch control unit, a first end of a channel of the switch thin film transistor is connected to a second end of a channel of the sensor thin film transistor and a second end of the channel of the switch thin film transistor is connected to the input terminal of the reading unit.

3. The liquid crystal display device according to claim 1, wherein the second end of the channel of the sensor thin film transistor and the first end of the channel of the switch thin film transistor are connected to a transparent electrode.

4. The liquid crystal display device according to claim 1, wherein the sensor thin film transistor and the switch thin film transistor are formed on a transparent substrate, and the liquid crystal display device further comprises a light-emitting unit under the transparent substrate.

5. The liquid crystal display device according to claim 1, further comprising an electricity charging unit, wherein one end of the charging unit is connected to the second end of the channel of the sensor thin film transistor and the other end of the charging unit is connected to the first end of the channel of the switch thin film transistor, and electric charges generated from the sensor thin film transistor is accumulated in the electricity charging unit.

6. The liquid crystal display device according to claim 1, further comprising a light shut-off layer formed on the top of the switch thin film transistor.

7. A liquid crystal display device, capable of performing both image display mode and fingerprint recognition mode, wherein an image display panel and a photosensitive panel are integrally formed,

wherein the image display panel comprises a scan drive unit which sequentially turns on rows formed in the image display panel for each frame in order to display images, and a data drive unit which outputs data signals to a turned-on row formed in the image display panel, and

wherein the photosensitive panel comprises a switch control unit which sequentially turns on rows formed in the fingerprint recognition panel for each frame in order to perform fingerprint recognition, and a reading unit, to which optical information sensed from a turned-on row is outputted.

8. The liquid crystal display according to claim 7, wherein the fingerprint recognition panel is formed from an array of photosensitive components, each of the photosensitive components comprising:

a sensor thin film transistor, in which a photosensitive layer is formed between a drain and a source of the sensor thin film transistor, and when light exceeding a predetermined amount of light is incident into the photosensitive transistor, the drain and the source become electrically conductive; and

a switch thin film transistor, in which a gate of the switch thin film transistor is connected to the output terminal of the switch control unit, a first end of a channel of the switch thin film transistor is connected to a second end of a channel of the sensor thin film transistor and a second end of the channel of the switch thin film transistor is connected to the input terminal of the reading unit.