Touch panel integrated with liquid crystal display

• US 7,557,869 B2
• Filed: 12/23/2003
• Issued: 07/07/2009
• Est. Priority Date: 12/24/2002
• Status: Expired due to Fees

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Jae Bum, Park, Hee Jeong, Bang, Yong Ik, You, Tae H
• Primary Examiner(s): Nelms; David
• Assistant Examiner(s): Briggs; Nathanael R
• Application Number:
  US10/742,802
• Publication Number:
  US 20040135773A1
• Time in Patent Office: 2,023 Days
• Field of Search: 349/12, 349/58, 345/173
• US Class Current: 349/12
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: G06F 3/043 using propagating acoustic waves
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: G06F 3/046 by electromagnetic means

Abstract

A touch panel integrated with a liquid crystal display (LCD) includes an LCD panel, a touch panel arranged on the liquid crystal panel, and a transparent conductive film arranged between the LCD panel and the touch panel for substantially eliminating electromagnetic interference between the a common electrode signal of the LCD panel and the touch panel.

Claims

1. A touch panel integrated with a liquid crystal display (LCD) panel, comprising:

an LCD panel having first and second substrates to face each other and a liquid crystal layer between the first and second substrates, wherein the first substrate has a common electrode on the whole surface of the first substrate and wherein the LCD panel is driven with a line inversion method;

a touch panel operably arranged over the entire LCD panel;

a case top covering and supporting a side of the LCD panel;

a main support fixing the LCD panel with respect to the touch panel; and

a transparent conductive film arranged between the LCD panel and the touch panel, the transparent conductive film substantially eliminating electromagnetic interference between the LCD panel and the touch panel, wherein the transparent conductive film is electrically grounded to the case top via a conductive adhesive material coupled to an end of a peripheral portion of the main support and a peripheral portion of the transparent conductive film and the transparent conductive film is directly on the upper surface of the LCD panel.

2. The touch panel integrated with the LCD panel of claim 1, wherein the transparent conductive film includes one of indium oxide, tin oxide, zinc oxide, indium-tin oxide, indium-zinc oxide, silver, silver alloy, copper, copper alloy and gold.

3. The touch panel integrated with the LCD panel of claim 1, wherein the transparent conductive film includes at least one electrically conductive layer.

4. The touch panel integrated with the LCD panel of claim 1, wherein the transparent conductive film includes a laminate of at least two electrically conductive layers.

5. The touch panel integrated with the LCD panel of claim 1, wherein the touch panel comprises one of a resistive-type touch panel, a capacitive-type touch panel and an electromagnetic (EM)-type touch panel.

6. The touch panel integrated with the LCD panel of claim 1, further comprising:

an upper polarizing plate arranged between the touch panel and the transparent conductive film; and

a lower polarizing plate arranged on a bottom surface of the LCD panel.

7. The touch panel integrated with the LCD panel of claim 1, wherein the conductive adhesive material includes copper or aluminum.

8. A touch panel integrated with a liquid crystal display (LCD) device, comprising:

an LCD panel which is driven with a line inversion method, the LCD panel comprising;

an upper substrate, the upper substrate supporting a color filter array and a common electrode;

a lower substrate opposing the upper substrate, the lower substrate supporting a thin film transistor array; and

a liquid crystal layer between the upper and lower substrates;

an upper polarizing plate over the LCD panel;

a lower polarizing plate below the LCD panel;

a touch panel over the entire upper polarizing plate;

a case top covering and supporting a side of the LCD panel;

a main support for fixing the LCD panel, the upper polarizing plate, and the lower polarizing plate with respect to the touch panel; and

a transparent conductive film between the upper polarizing plate and the touch panel, the transparent conductive film substantially eliminating electromagnetic interference between the LCD panel and the touch panel, wherein the transparent conductive film is coupled to the case top via an electrically conductive adhesive material between an end of a peripheral portion of the main support and a peripheral portion of the transparent conductive film, and the transparent conductive film is directly on the upper surface of the LCD panel.

9. The touch panel integrated with the LCD device of claim 8, wherein the electrically conductive adhesive includes copper or aluminum.

10. The touch panel integrated with the LCD device of claim 8, wherein the transparent conductive film includes one of indium oxide, tin oxide, zinc oxide, indium-tin oxide, indium-zinc oxide, silver, silver alloy, copper, copper alloy and gold.

11. The touch panel integrated with the LCD device of claim 8, wherein the transparent conductive film includes at least one electrically conductive layer.

12. The touch panel integrated with the LCD device of claim 8, wherein the transparent conductive film includes a laminate of at least two electrically conductive layers.

13. The touch panel integrated with the LCD device of claim 8, wherein the LCD panel is a TN mode LCD panel.

14. The touch panel integrated with the LCD device of claim 8, wherein the touch panel is one of a resistive-type touch panel, a capacitive-type touch panel and an electromagnetic (EM)-type touch panel.