Liquid crystal display device

• US 9,619,055 B2
• Filed: 08/25/2010
• Issued: 04/11/2017
• Est. Priority Date: 08/26/2009
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Japan Display Incorporated, Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Matsumoto, Shohei, Oohira, Eiji
• Primary Examiner(s): Lee, Nicholas
• Assistant Examiner(s): Adediran, Abdul-Samad A
• Application Number:
  US12/868,058
• Publication Number:
  US 20110050612A1
• Time in Patent Office: 2,421 Days
• Field of Search: 349122, 349 58, 359885, 362 84, 362607, 428343
• CPC Class Codes: G02F 1/13332 Front frames
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads

Abstract

In a liquid crystal display panel including a touch panel and a front window, it is possible to reduce the reproduction cost of the touch panel, achieving a high yield in the reproduction of the touch panel. The touch panel and the front window are bonded together by a PET film and a UV curable resin. When air bubbles or other defects are found between the front window and the touch panel, the front window and the touch panel are detached by cutting the UV curable resin by a cutter blade, in order to reproduce the touch panel. The residue of the UV curable resin left on the PET film is removed by detaching the PET film from the touch panel. A tab in which the adhesive is not formed is provided in an end of the PET film, so that the PET film can be easily detached from the touch panel, starting from the tab.

Claims

1. A liquid crystal display device comprising:

a liquid crystal display panel;

a backlight;

a resin mold in which the liquid crystal display panel and the backlight are placed;

a touch panel attached to the liquid crystal display panel; and

a front window attached to the touch panel,

wherein the front window includes a printing frame which is formed as a light-shielding pattern in a periphery of the front window,

wherein the touch panel and the front window are bonded together by a plastic film including an adhesive material formed on a plastic substrate, and by a UV curable resin,

wherein the front window is bonded to the plastic substrate of the plastic film by the UV curable resin and the touch panel is bonded to the plastic substrate of the plastic film by the adhesive material which is comprised of a different material than the UV curable resin,

wherein a tab in which the adhesive material is not formed is present in a corner of the plastic film, said tab being located and configured to facilitate removal of the plastic film from the touch panel for repair of the liquid crystal display device by pulling the tab in an upward direction away from the touch panel without the need to stretch the plastic substrate,

wherein the tab is provided between the touch panel and the front window,

wherein an outer end of the tab is overlapped with the touch panel and the front window in plan view,

a width of the tab is narrower than that of the plastic film, and

the plastic film being separable from the touch panel at the adhesive material without leaving the UV curable resin on the touch panel.

2. The liquid crystal display device according to claim 1, wherein the plastic film is a PET film.

3. The liquid crystal display device according to claim 1, wherein a protrusion of the tab is 0.2 mm or more.

4. A liquid crystal display device comprising:

a liquid crystal display panel;

a backlight;

a resin mold in which the liquid crystal display panel and the backlight are placed;

a touch panel attached to the liquid crystal display panel; and

a front window attached to the touch panel,

wherein the front window includes a printing frame which is formed as a light-shielding pattern in a periphery of the front window,

wherein the touch panel and the front window are bonded together by a plastic film including an adhesive material formed on a plastic substrate, and by a UV curable resin,

wherein the front window is bonded to the plastic substrate of the plastic film by the UV curable resin and the touch panel is bonded to the plastic substrate of the plastic film by the adhesive material which is comprised of a different material than the UV curable resin,

wherein an area in which the adhesive material is not formed is present in a corner of the plastic film, said area being located and configured to facilitate removal of the plastic film from the touch panel for repair of the liquid crystal display device by pulling the area in an upward direction away from the touch panel without the need to stretch the plastic substrate,

wherein the area is provided between the touch panel and the front window,

wherein an outer end of the area is overlapped with the touch panel and the front window in plan view,

wherein a width of the area in which the adhesive material is not formed is narrower than a width of the plastic film, and

the plastic film being separable from the touch panel at the adhesive material without leaving the UV curable resin on the touch panel.

5. The liquid crystal display device according to claim 4,

wherein the plastic film is a PET film.

6. The liquid crystal display device according to claim 4,

wherein the area in which the adhesive material is not formed has a chamfered shape in the corner of the plastic film, and

wherein an amount of c in the chamfered corner is 0.2 mm or more.

7. A liquid crystal display device comprising:

a liquid crystal display panel;

a backlight;

a resin mold in which the liquid crystal display panel and the backlight are placed;

a touch panel attached to the liquid crystal display panel; and

a front window attached to the touch panel,

wherein the front window includes a printing frame which is formed as a light-shielding pattern in a periphery of the front window,

wherein the touch panel and the front window are bonded together by a plastic film including an adhesive material formed on a plastic substrate, and by a UV curable resin,

wherein the front window is bonded to the plastic substrate of the plastic film by the UV curable resin and the touch panel is bonded to the plastic substrate of the plastic film by the adhesive material which is comprised of a different material than the UV curable resin,

means formed in a corner of the plastic film for facilitating removal of the plastic film from the touch panel for repair of the liquid crystal display device by moving the plastic film in an upward direction away from the touch panel without the need to stretch the plastic substrate,

wherein the means formed in a corner of the plastic film is provided between the touch panel and the front window,

an outer end of the means formed in a corner of the plastic film is overlapped with the touch panel and the front window in plan view,

a width of the means formed in a corner of the plastic film is narrower than a width of the plastic film, and

the plastic film being separable from the touch panel at the adhesive material without leaving the UV curable resin on the touch panel.

8. The liquid crystal display device according to claim 7,

wherein the plastic film a PET film.

9. The liquid crystal display device according to claim 7,

wherein the area in which the adhesive material is not formed has a chamfered shape in the corner of the plastic film, and

wherein an amount of c in the chamfered corner is 0.2 mm or more.