Touch panel display device

• US 9,134,859 B2
• Filed: 05/16/2011
• Issued: 09/15/2015
• Est. Priority Date: 06/14/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Jeon, Seongman, Kim, Sangcheon
• Primary Examiner(s): Nguyen, Hoan C
• Application Number:
  US13/508,298
• Publication Number:
  US 20120223905A1
• Time in Patent Office: 1,583 Days
• Field of Search: 349/12, 345173-179
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/044 by capacitive means

Abstract

The present invention relates to a display device having a touch panel, and more particularly, to a touch panel display device which can improve visibility. The display device of the present invention includes: a display panel; a first film layer that is disposed on the display panel, and includes a first material, a first transparent layer having a first pattern disposed on the first material, and an index matching layer disposed between the first material and the first transparent layer; a second film layer that is disposed on the first film layer, and includes a second material, a second transparent layer having a second pattern disposed on the second material, and an index matching layer disposed between the second material and the second transparent layer; and a touch window disposed on the second film layer.

Claims

1. A touch panel display device comprising:

a display panel;

a first film layer arranged over the display panel, the first film layer comprising a first substrate, a first transparent conductive layer arranged under the first substrate and having a first pattern, and an index matching layer provided at a surface in which the first transparent conductive layer is not located;

a second film layer arranged over the first film layer, the second film layer comprising a second substrate, a second transparent conductive layer arranged under the second substrate and having a second pattern, and an index matching layer provided at a surface in which the second transparent conductive layer is not located; and

a touch window arranged over the second film layer,

wherein the index matching layer allows at least one of reflectivity between the first substrate and the first transparent conductive layer and reflectivity between the second substrate and the second transparent conductive layer to be 1% or less.

2. The touch panel display device according to claim 1, further comprising a first polarization conversion portion arranged between the first transparent conductive layer and the display panel to convert light passing through the first polarization conversion portion into a first circularly polarized light state.

3. The touch panel display device according to claim 2, wherein the first polarization conversion portion comprises:

a first linear polarization plate; and

a first ¼

wavelength plate located over the first linear polarization plate.

4. The touch panel display device according to claim 3, wherein the first substrate is the first ¼

wavelength plate.

5. The touch panel display device according to claim 1, further comprising a second polarization conversion portion arranged between the second transparent conductive layer and the touch window to form light passing through the second polarization conversion portion in the form of a first circularly polarized light state.

6. The touch panel display device according to claim 5, wherein the second polarization conversion portion comprises:

a second ¼

wavelength plate; and

a second linear polarization plate located over the second ¼

wavelength plate.

7. The touch panel display device according to claim 6, wherein the second substrate is the second ¼

wavelength plate.

8. The touch panel display device according to claim 1, wherein at least one of the first and second substrates is an isotropic transparent film.

9. The touch panel display device according to claim 1, wherein the display panel is a liquid crystal display panel comprising a liquid crystal cell.

10. The touch panel display device according to claim 1, wherein at least one surface of the first and second substrates is further provided with a hard coating layer.

11. The touch panel display device according to claim 1, wherein the index matching layer comprises a higher refractive layer and a lower refractive layer.

12. The touch panel display device according to claim 11, wherein the higher refractive layer and the lower refractive layer are alternately disposed in the form of a plurality layers.

13. The touch panel display device according to claim 1, further comprising a third film layer comprising a third substrate and a third transparent conductive layer while being located between the display panel and the first film layer.

14. A touch panel display device comprising:

a display panel;

a first film layer arranged over the display panel, the first film layer comprising a first substrate, a first transparent conductive layer arranged under the first substrate and having a first line pattern, and an index matching layer arranged between lines of the first line pattern;

a second film layer arranged over the first film layer, the second film layer comprising a second substrate, a second transparent conductive layer arranged under the second substrate and having a second line pattern, and an index matching layer arranged between lines of the second line pattern;

a touch window arranged over the second film layer;

a first polarization conversion portion arranged between the first transparent conductive layer and the display panel to convert light passing through the first polarization conversion portion into a first circularly polarized light state; and

a second polarization conversion portion arranged between the second transparent conductive layer and the touch window to form light passing through the second polarization conversion portion in the form of a first circularly polarized light state.

15. The touch panel display device according to claim 14, wherein the first polarization conversion portion comprises:

a first linear polarization portion; and

a first ¼

wavelength plate located over the first linear polarization portion, and

wherein the second polarization conversion portion comprises;

a second ¼

wavelength plate; and

a second linear polarization portion located over the second ¼

wavelength plate.

16. The touch panel display device according to claim 15, wherein the second linear polarization portion has an optical axis parallel with an optical axis of the first linear polarization portion.

17. The touch panel display device according to claim 15, wherein the second linear polarization portion has an optical axis perpendicular to that of the first linear polarization portion.

18. The touch panel display device according to claim 14, wherein the index matching layer has a function to compensate difference in index of refraction between the first substrate and the first transparent conductive layer and between the second substrate and the second transparent conductive layer.

19. The touch panel display device according to claim 14, wherein the index matching layer allows at least one of reflectivity between the first substrate and the first transparent conductive layer and reflectivity between the second substrate and the second transparent conductive layer to be 1% or less.

20. The touch panel display device according to claim 14, wherein the display panel is a liquid crystal display panel comprising a liquid crystal cell.

21. The touch panel display device according to claim 14, wherein at least one surface of the first and second substrates is further provided with a hard coating layer.

22. The touch panel display device according to claim 14, wherein the index matching layer comprises a higher refractive layer and a lower refractive layer.

23. A touch panel display device comprising:

a display panel;

a first polarization conversion portion arranged over the display panel to convert light passing through the first polarization conversion portion into a first circularly polarized light state;

a touch panel portion arranged over the first polarization conversion portion and comprising at least two transparent conductive layers, each of the transparent conductive layers has a pattern;

a second polarization conversion portion arranged over the touch panel portion to form light passing through the second polarization conversion portion in the form of a first circularly polarized light state; and

an index matching layer arranged between the respective patterns of the transparent conductive layers.

24. The touch panel display device according to claim 23, wherein the first polarization conversion portion comprises:

a first linear polarization portion located over the display panel; and

a first ¼

wavelength plate located over the first linear polarization portion.

25. The touch panel display device according to claim 23, wherein the second polarization conversion portion comprises:

a second ¼

wavelength plate located over the touch panel portion; and

a second linear polarization portion located over the second ¼

wavelength plate.

26. The touch panel display device according to claim 23, wherein the second linear polarization portion has an optical axis parallel with an optical axis of the first linear polarization portion.

27. The touch panel display device according to claim 23, wherein the second linear polarization portion has an optical axis perpendicular to that of the first linear polarization portion.

28. The touch panel display device according to claim 23, wherein the display panel is a liquid crystal display panel comprising a liquid crystal cell.

29. The touch panel display device according to claim 28, wherein the first linear polarization portion is included in the liquid crystal display panel.

30. The touch panel display device according to claim 28, wherein the liquid crystal display panel further comprises a lower polarization plate at a lower side of the liquid crystal cell.

31. The touch panel display device according to claim 23, wherein each of the transparent conductive layers is located over a ¼

wavelength plate included in the first or second polarization conversion portion or over a transparent film.

32. A touch panel display device comprising:

a liquid crystal display panel comprising a first linear polarization plate;

a first ¼

wavelength plate to convert light passing through the first ¼

wavelength plate into a first circularly polarized light state, while being operated together with the first linear polarization plate;

at least two transparent conductive layers each having a respective pattern arranged over the first ¼

wavelength plate and/or a transparent film while being spaced apart from each other;

a second polarization conversion portion arranged over each of the transparent conductive layer to form light passing through the second polarization conversion portion in the form of a first circularly polarized light state; and

an index matching layer arranged between the respective patterns of the transparent conductive layers.

33. A touch panel display device comprising:

a touch window;

a touch panel portion comprising at least two transparent conductive layers;

a second polarization conversion portion comprising a second ¼

wavelength plate and a second linear polarization portion, installed between the touch window and the touch panel portion;

a display portion arranged at a lower end of the touch panel portion;

a first polarization conversion portion comprising a first ¼

wavelength plate and a first linear polarization portion, installed between the touch panel portion and the display portion; and

an index matching layer arranged between the first ¼

wavelength plate or the second ¼

wavelength plate and one of the transparent conductive layers,

wherein the second linear polarization portion linearly polarizes light incident from the touch window onto the touch panel portion, and the second ¼

wavelength plate converts the light passing through the second linear polarization portion into circularly polarized light of a first direction.

34. The touch panel display device according to claim 33, wherein the second ¼

wavelength plate converts the light reflected from the transparent conductive layers into linearly polarized light.

35. The touch panel display device according to claim 33, wherein the second linear polarization portion has an optical axis parallel with an optical axis of the first linear polarization portion.

36. The touch panel display device according to claim 33, wherein the second linear polarization portion has an optical axis perpendicular to that of the first linear polarization portion.