# US 7,411,574 B2 · Tablet liquid crystal display device

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- Number: US 7,411,574 B2
- Document ID: US7411574B2
- Status: Granted
- Kind: B2
- Application number: 11/142,744
- Filed: 2005-06-01
- Published: 2006-10-19
- Granted: 2008-08-12
- Earliest claimed: 2005-04-18
- Assignees: Boe Hydis Technology Co., Ltd.
- Inventors: Choel Hwan Lee; Kwang Hyun Park
- Web page: https://patentgrep.com/patent/US7411574B2

## CPC

- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/042: by opto-electronic means
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

Disclosed is a tablet liquid crystal display device which senses light applied from a light irradiating device to receive an input signal applied from an exterior. The tablet liquid crystal display device comprising: a liquid crystal panel for displaying an image, including a black matrix formed in a lattice form; and a signal recognizing section for generating an electromotive force according to a light signal inputted from an exterior, wherein the signal recognizing section comprises: a plurality of first photoelectromotive force generation layers, each of which is located above the black matrix in a sectional view, is overlapped with the black matrix in a plan view, and extends in a first direction; an insulating layer deposited to cover at least an upper surface of the first electromotive force generation layers; a plurality of second photoelectromotive force generation layers, each of which is located above the black matrix in a sectional view, is overlapped with the black matrix in a plan view, and extends in a second direction perpendicular to the first direction; and a protection layer deposited over an entire area of the signal recognizing section.

## Claims

### Claim 1

A tablet liquid crystal display device comprising:
a liquid crystal panel for displaying an image, including a black matrix formed in a lattice form; and
a signal recognizing section for generating an electromotive force according to a light signal inputted from an exterior,
wherein the signal recognizing section comprises:
a plurality of first photoelectromotive force generation layers, each of which is located above the black matrix in a sectional view, is overlapped with the black matrix in a plan view, and extends in a first direction;
an insulating layer deposited to cover at least an upper surface of the first electromotive force generation layers;
a plurality of second photoelectromotive force generation layers, each of which is located above the black matrix in a sectional view, is overlapped with the black matrix in a plan view, and extends in a second direction perpendicular to the first direction; and
a protection layer deposited over an entire area of the signal recognizing section.

### Claim 2 (depends on 1)

The tablet liquid crystal display device as claimed in claim 1, wherein each of the first and second photoelectromotive force generation layers comprises a lower electrode layer, a P-type semiconductor layer, an N-type semiconductor layer and an upper electrode layer, which are sequentially deposited.

### Claim 3 (depends on 1)

The tablet liquid crystal display device as claimed in claim 1, wherein each of the first and second photoelectromotive force generation layers comprises a lower electrode layer, an N-type semiconductor layer, a P-type semiconductor layer and an upper electrode layer, which are sequentially deposited.

### Claim 4 (depends on 2)

The tablet liquid crystal display device as claimed in claim 2, wherein each of the first and second photoelectromotive force generation layers has a line width equal to or smaller than that of the black matrix of the lattice form, so that the first and second photoelectromotive force generation layers are included in the black matrix in a plan view.

### Claim 5 (depends on 3)

The tablet liquid crystal display device as claimed in claim 3, wherein each of the first and second photoelectromotive force generation layers has a line width equal to or smaller than that of the black matrix of the lattice form, so that the first and second photoelectromotive force generation layers are included in the black matrix in a plan view.

### Claim 6 (depends on 1)

The tablet liquid crystal display device as claimed in claim 1, wherein the signal recognizing section is located on the liquid crystal panel.

### Claim 7 (depends on 1)

The tablet liquid crystal display device as claimed in claim 1, wherein the liquid crystal panel further includes first and second substrates located on and beneath the black matrix, respectively, and the signal recognizing section is located between the first and second substrates.