Liquid crystal display device having electromagnetic type touch panel

• US 7,755,616 B2
• Filed: 10/09/2003
• Issued: 07/13/2010
• Est. Priority Date: 03/28/2003
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Jung, Yong Chae, Yang, Dong Kyu
• Primary Examiner(s): Nguyen; Chanh
• Assistant Examiner(s): MA, CALVIN
• Application Number:
  US10/681,348
• Publication Number:
  US 20040189587A1
• Time in Patent Office: 2,469 Days
• Field of Search: 345/173, 345/174, 345/175, 345/176, 345/177, 345/178, 345/179, 345/104
• US Class Current: 345/174
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 3/046 by electromagnetic means
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures

Abstract

An LCD device having an electromagnetic (EM) type touch panel is disclosed, which includes an electromagnetic sensor inside an LCD panel. The EM type touch panel has a thin profile and can be fabricated through a simplified manufacturing process. The LCD device includes an LCD panel having first and second substrates facing each other, and a liquid crystal layer between the first and second substrates; an EM sensor having X-axis and Y-axis transparent electrode coils formed in one body with any one of the first and second substrates in the LCD panel; a backlight unit below the LCD panel; and a controller below the backlight, the controller controlling the EM sensor.

Claims

1. A LCD device including an electromagnetic (EM) type touch panel comprising:

first and second substrates facing each other;

a thin film transistor array on the first substrate;

a plurality of pixel electrodes electrically connected to respective thin film transistors of the thin film transistor array;

an EM sensor including first and second coil arrays formed of a transparent electrode on the second substrate, wherein each of the first and second coil arrays include a plurality of coils and each of the plurality of coils has first and second open ends and wherein the first coil array is perpendicular to the second coil array;

a light-shielding layer and a color filter layer corresponding to the pixel electrodes are disposed on the EM sensor, wherein the light-shielding layer and the color filter layer are not coplanar with the EM sensor;

an overcoat layer on the color filter layer and the light-shielding layer;

a common electrode on the overcoat layer;

a liquid crystal layer between the first and second substrates; and

a backlight unit below the first substrate.

2. The LCD device of claim 1, further comprising a controller below the backlight unit for controlling the EM sensor.

3. The LCD device of claim 1, wherein the EM sensor includes:

a first transparent insulating layer over the first coil array including the second substrate, wherein the first coil is formed on the second substrate; and

a second transparent insulating layer over the first transparent insulating layer, including the second coil array, wherein the second coil array is formed on the first transparent insulating layer.

4. The LCD device of claim 3, wherein the first and second transparent insulating layers are formed of organic layers.

5. The LCD device of claim 1, wherein the first open end is electrically connected to a grounding voltage.

6. The LCD device of claim 5, wherein the second open end is electrically connected to a MUX.

7. The LCD device of claim 6 wherein one of the plurality of coils is selected, and then a voltage from the MUX is applied to the selected coil.

8. The LCD device of claim 1, wherein the overcoat layer is formed of an organic layer.

9. A LCD device including an EM type touch panel comprising:

first and second substrates facing each other;

a plurality of pixel regions on the first substrate, each pixel region including a thin film transistor, pixel electrode, and a common electrode;

a light-shielding layer and a color filter layer on the second substrate corresponding to the plurality of pixel regions;

an EM sensor including first and second coil arrays formed of a transparent electrode is disposed on the light-shielding layer and the color filter layer, wherein the first coil array is perpendicular to the second coil array and the light-shielding layer and the color filter layer are not coplanar with the EM sensor;

an overcoat layer on the EM sensor, wherein each of the first and second coil arrays include a plurality of coils, and each of the plurality of coils has first and second open ends;

a liquid crystal layer between the first and second substrates; and

a backlight unit below the first substrate.

10. The LCD device of claim 9, further comprising a controller below the backlight unit for controlling the EM sensor.

11. The LCD device of claim 9, wherein the EM sensor includes:

a first transparent insulating layer over the light-shielding layer and the color filter layer including the first coil array, wherein the first coil array is formed on the light-shielding layer and the color filter; and

a second transparent insulating layer over the first transparent insulating layer including the second coil array, wherein the second coil array is formed on the first transparent insulating layer.

12. The LCD device of claim 11, wherein the first and second transparent insulating layers are formed of organic layers.

13. The LCD device of claim 9, wherein the first open end is electrically connected to a grounding voltage.

14. The LCD device of claim 13, wherein the second open end is electrically connected to a MUX.

15. The LCD device of claim 14, wherein one of the plurality of coils is selected, and then a voltage from the MUX is applied to the selected coil.

16. A LCD device including an EM type touch panel comprising:

first and second substrates facing each other;

a thin film transistor array on the first substrate;

a plurality of pixel electrodes electrically connected to respective thin film transistors of the thin film transistor array;

an insulating layer over the thin film transistor array and the pixel electrodes;

an EM sensor including first and second coil arrays formed of a transparent electrode is directly on the insulating layer, wherein each of the first and second coil arrays include a plurality of coils, and each of the plurality of coils has first and second open ends and wherein the first coil array is perpendicular to the second coil array;

a light-shielding layer and a color filter layer on the second substrates, wherein the light-shielding layer and the color filter layer are not coplanar with the EM sensor;

a liquid crystal layer between the first and second substrates; and

a backlight unit below the first substrate.

17. The LCD device of claim 16, further comprising a common electrode on any one of the first and second substrates and a controller for controlling the EM sensor below the backlight unit.

18. The LCD device of claim 16, wherein the insulating layer is formed of an organic layer.

19. The LCD device of claim 16, wherein the EM sensor includes:

a first transparent insulating layer over the insulating layer including the first coil array, wherein the first coil array is formed on the insulating layer; and

a second transparent insulating layer over the first transparent insulating layer including the second coil array, wherein the second coil array is formed on the first transparent insulating layer.

20. The LCD device of claim 16, wherein the first open end is electrically connected to a grounding voltage.

21. The LCD device of claim 20, wherein the second open end is electrically connected to a MUX.

22. The LCD device of claim 21, wherein one of the coils is selected, and then a voltage from the MUX is applied to the selected coil.