Position sensible liquid crystal display device

• US 6,191,828 B1
• Filed: 06/14/1999
• Issued: 02/20/2001
• Est. Priority Date: 08/24/1996
• Status: Expired due to Term

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ahm, Young Soo, Kim, Chee Young, Kim, Jun Hee
• Primary Examiner(s): Dudek, James A.
• Application Number:
  US09/335,466
• Time in Patent Office: 617 Days
• Field of Search: 349/12, 349/23, 345/174
• US Class Current: 349/12
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0444 using a single conductive element covering the whole sensing surface, e.g. by sensing the electrical current flowing at the corners

Abstract

A position sensible liquid crystal display device includes a first substrate having a plurality of scanning lines, data lines, thin film transistors and pixel, and a second substrate having a plurality of first lines formed along the scanning lines and a plurality of second lines formed along the data lines, for position sensing. The black matrix is used as the position sensor input device.

Claims

1. A position sensor input device on a first substrate comprising:

a grid pattern;

a driving signal applying section;

an equipotential sustaining resistor electrically connected to the driving signal applying section; and

a plurality of equipotential compensating resistors connecting the equipotential sustaining resistor to the grid pattern,

wherein the equipotential sustaining resistor includes a plurality of first resistance bodies arranged in one direction at fixed intervals, and at least two second resistance bodies disposed between and connected to adjacent first resistance bodies.

2. The device according to claim 1, wherein the resistance of the first resistance bodies is lower than the resistance of the second resistance bodies.

3. The device according to claim 1, wherein the second resistance bodies and the equipotential compensating resistors have equal line width.

4. The device according to claim 1, wherein the at least two second resistance bodies are arranged in parallel between the first resistance bodies.

5. The device according to claim 1, wherein each of the plurality of first lines are connected to the equipotential compensating resistor.

6. The device according to claim 1, wherein the equipotential compensating resistors closer to the driving signal applying section have longer line length than equipotential compensating resistors farther from the driving signal applying section.

7. The device according to claim 1, further including:

a second substrate having a driving signal applying part;

a liquid crystal layer; and

a conductive layer between the first and second substrates, the conductive layer electrically connecting the driving signal applying part to the driving signal applying section.

8. The device as claimed in claim 1, wherein the grid pattern includes a plurality of first lines and a plurality of second lines forming a matrix.

9. The device as claimed in claim 1, wherein the device further includes a node resistor between the driving signal applying section and the equipotential sustaining resistor.