METHOD FOR REWORKING ADHESIVELY BONDED LIQUID CRYSTAL DISPLAYS

• US 20110134385A1
• Filed: 12/22/2008
• Published: 06/09/2011
• Est. Priority Date: 12/28/2007
• Status: Abandoned Application

• Current Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Farah, Hassan Mohamed
• Application Number:
  US12/810,185
• Publication Number:
  US 20110134385A1
• Time in Patent Office: Days
• US Class Current: 349/187
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells
• CPC Class Codes: G02F 2202/28 Adhesive materials or arrangements
• CPC Class Codes: G02F 2203/68 Green display, e.g. recycling, reduction of harmful substances
• CPC Class Codes: Y10T 156/11 Methods of delaminating, per se; i.e. , separating at bonding face

Abstract

A method is disclosed for reworking a bonded LCD having a substrate (e.g., plate or film) adhesively bonded to a face (e.g., front face) of the LCD. The method provides for efficient and clean removal of the substrate from the LCD when necessary (e.g., when defect(s) are present) without damage to the LCD such that the LCD can subsequently be re-bonded.

Claims

1. A method for reworking a liquid crystal display having a surface and a substrate adhesively bonded with a cured adhesive layer to the surface of the display, the method comprising:

a) slicing through the cured adhesive layer with a tool such that the substrate is no longer bonded to the liquid crystal display; and

b) removing the cured adhesive layer from the liquid crystal display to afford a de-bonded liquid crystal display.

2. The method of claim 1 wherein the tool is a wire in a U-shaped loop that is drawn through the cured adhesive layer starting at one edge of the cured adhesive layer and ending at an opposing edge of the one edge of the cured adhesive layer.

3. The method of claim 2 wherein the wire is repetitively advanced in at least one cycle through the cured adhesive in an incremental, cyclic fashion with the at least one cycle corresponding to one end of the wire first being incrementally advanced with respect to that of the other end of the wire and then the other end of the wire being incrementally advanced with respect to that of the one end of the wire.

4. The method of claim 1 wherein the liquid crystal display is heated at a temperature above ambient temperature prior to its being subjected to step a).

5. The method of claim 1 wherein the tool is heated at a temperature above ambient temperature prior to its use in step a).

6. The method of claim 1 wherein the tool is heated at a temperature above ambient temperature during its use in step a).

7. The method of claim 1 further comprising:

c) cleaning the de-bonded liquid crystal display to remove any residual cured adhesive to afford a liquid crystal display that is ready for reworking.