Position sensible liquid crystal display device

• US 5,963,277 A
• Filed: 08/22/1997
• Issued: 10/05/1999
• 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: Kim, Jun Hee, Ahn, Young Soo, Kim, Chee Young
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): DUDEK, JAMES A
• Application Number:
  US08/916,532
• Time in Patent Office: 774 Days
• Field of Search: 349/12, 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 pixels, 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 sensible liquid crystal display device comprising:

a first substrate having a plurality of scanning lines, data lines crossing said scanning lines, thin film transistors, and pixels; and

, a second substrate having a plurality of first lines formed over a plurality of the scanning lines and a plurality of second lines formed over a plurality of the data lines, the first and second lines used to determine position of an applied stylus,

wherein the number of said first lines is substantially less than that of said scanning lines and the number of said second lines is substantially less than the number of said data lines.

2. A device as claimed in claim 1, wherein the first lines and the second lines are integral with a black matrix.

3. A device as claimed in claim 2, wherein the black matrix is formed of chromium, an alloy of chromium and aluminum, or an alloy of chromium and nickel.

4. A device as claimed in claim 1, wherein the first lines and the second lines have different potentials at different positions when a driving signal is applied to the first lines and the second lines.

5. A device as claimed in claim 1, wherein the first lines and the second lines are connected to one another at crossing points, to thereby form a matrix.

6. A position sensible liquid crystal display device, comprising:

a first substrate having a plurality of scanning lines, data lines crossing said scanning lines, thin film transistors, and pixels;

a second substrate having a plurality of first lines formed over a plurality of the scanning lines and a plurality of second lines formed over a plurality of the data lines, the first and second lines used to determine position of an applied stylus,

wherein the number of said first lines is substantially less than that of said scanning lines and the number of said second lines is substantially less than the number of said data lines and further wherein the first lines and the second lines are connected to one another at crossing points, to thereby form a matrix; and

a light shielding layer opposite the scanning lines and data lines that do not correspond to said matrix.

7. A device as claimed in claim 6, wherein the light shielding layer is integral with a black matrix.

8. A position sensible liquid crystal display device, comprising:

a first substrate having a plurality of scanning lines, data lines crossing said scanning lines, thin film transistors, and pixels;

a second substrate having a plurality of first lines formed over a plurality of the scanning lines and a plurality of second lines formed over a plurality of the data lines, the first and second lines used to determine position of an applied stylus,

wherein the number of said first lines is substantially less than that of said scanning lines and the number of said second lines is substantially less than the number of said data lines and further wherein the second substrate includes;

a driving signal applying section formed at four corners of the second substrate,

equipotential sustaining resistors formed between the driving signal applying sections,

a plurality of equipotential compensating resistors each having one side connected to the first lines and the other side connected to one of the equipotential sustaining resistors, and

node resistors connected between one of the driving signal applying section and one of the equipotential sustaining resistors.

9. A device as claimed in claim 8, wherein the equipotential sustaining resistors and the equipotential compensating resistors have equal line widths.

10. A device as claimed in claim 8, wherein the equipotential sustaining resistors include:

low resistance bodies arranged in one direction at fixed intervals, and high resistance bodies disposed between and connected to the low resistance bodies.

11. A device as claimed in claim 10, wherein at least two of the high resistance bodies are arranged in parallel between the low resistance bodies.

12. A device as claimed in claim 8, wherein the node resistors have line widths the same width as the line widths of the equipotential sustaining resistors and the equipotential compensating resistors.

13. A device as claimed in claim 8, wherein the equipotential sustaining resistors closer to the driving signal applying section have a longer line length than the equipotential sustaining resistors farther from the driving signal applying section.

14. A device as claimed in claim 8, wherein the first lines and the second lines form a matrix.

15. A device as claimed in claim 8, wherein a common ITO layer is formed over a matrix of the first lines and the second lines.

16. A device as claimed in claim 8, wherein an ITO layer formed in a "T" pattern is arranged in the first substrate in an area where the equipotential sustaining resistors and the equipotential compensating resistors are connected, inclusive of the area of the equipotential compensating resistors.

17. A device as claimed in claim 16, wherein the "T" pattern ITO layer is separated from the common ITO layer.

18. A device as claimed in claim 16, wherein the "T" pattern ITO layer has a width wider than line widths of the equipotential sustaining resistors and the equipotential compensating resistors.

19. A device as claimed in claim 17, wherein the common ITO layer has a width wider than the width of the "T" pattern ITO layer.

20. A position sensible liquid crystal display device, comprising:

a first substrate having a plurality of scanning lines, data lines crossing said scanning lines, thin film transistors, and pixels;

a second substrate having a black matrix arranged in a matrix pattern for determining a position of an applied object and for shielding light incident to portions of the first substrate other than the pixel electrodes; and

a plurality of conductive layers formed at fixed intervals between the first and second substrates, the conductive layers transmitting a driving signal to the black matrix from the first substrate to the second substrate,

wherein the number of conductive layers is substantially less than that of said scanning lines and of said data lines.

21. A device as claimed in claim 20, wherein the conductive layers include silver.

22. A position sensible liquid crystal display device, comprising:

a first substrate having a plurality of scanning lines, data lines crossing said scanning lines, thin film transistors, and pixel electrodes;

a second substrate having a black matrix arranged in a matrix pattern for determining a position of an applied object and for shielding light incident to portions of the first substrate other than the pixel electrodes;

a plurality of conductive layers formed at fixed intervals between the first and second substrates, the conductive layers transmitting a driving signal to the black matrix from the first substrate to the second substrate; and

driving signal applying sections arranged on the second substrate for receiving the driving signal transmitted through the conductive layers and applying the driving signals to the black matrix.

23. A device as claimed in claim 22, wherein each of the driving signal applying sections includes layers of aluminum and chromium.

24. A position sensible liquid crystal display device, comprising:

a first substrate having a plurality of scanning lines, data lines crossing said scanning lines, thin film transistors, and pixel electrodes;

a second substrate having a black matrix arranged in a matrix pattern for determining a position of an applied object and for shielding light incident to portions of the first substrate other than the pixel electrodes;

a plurality of conductive layers formed at fixed intervals between the first and second substrates, the conductive layers transmitting a driving signal to the black matrix from the first substrate to the second substrate; and

a second conductive layer arranged around each of the conductive layers for transmitting the driving AC signal to the ITO layer, which is used as a common electrode.