Flexible, optically clear, composite structures for foldable displays in mobile devices
AssigneeMotorola Mobility LLC
InventorsRichard Brotzman, Deborah M. Paskiewicz
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Abstract
For a flexible, optically clear display stack, an adhesive, a system, and a method are provided. The adhesive is formed of polymer chains, at least a portion of which are cross-linked, a non-volatile diluent having a volume % in the range of between about 40 and 95, and is characterized with a low shear modulus of less than 10 kPa. The system is formed by at least first and second optically clear thin films with the adhesive disposed between the first and second thin films. The method includes the steps to form the system.
Claims20
An adhesive for assembling a thin film display stack, the adhesive comprising:
- a plurality of polymer chains, at least a portion of which are cross-linked, where the plurality of polymer chains comprise an acrylate polymer;
- a non-volatile diluent having a volume % in the range of between about 40 and 95, where the non-volatile diluent comprises an alkane with pendant alkyl groups;
- where the adhesive has a shear modulus of less than 10 kPa;
- and at least one thin film formed of a colorless polyimide material.
A display stack of a mobile computing device, the display stack comprising:
- a first thin film comprising an optically clear polymeric material formed of a colorless polyimide material;
- a second thin film comprising an optically clear polymeric material;
- and
- an adhesive layer disposed between the first thin film and the second thin film, where the adhesive layer comprises:
- a plurality of polymer chains, at least a portion of which are cross-linked, where the plurality of polymer chains comprise an acrylate polymer;
- a non-volatile diluent having a volume % in the range of between about 40 and 95, where the non-volatile diluent comprises an alkane with pendant alkyl groups;
- and
- where the adhesive layer has a shear module of less than 10 kPa.
A method of forming a foldable display stack, the method comprising:
- providing a first thin film comprising an optically clear polymeric material formed of a colorless polyimide material;
- providing a second thin film comprising an optically clear polymeric material;
- adhering the first thin film to the second thin film with an adhesive disposed between the first thin film and the second thin film, the adhesive comprising;
- a plurality of polymer chains, at least a portion of which are cross-linked, where the plurality of polymer chains comprise an acrylate polymer;
- a non-volatile diluent having a volume % in the range of between about 40 and 95, where the non-volatile diluent comprises an alkane with pendant alkyl groups;
- and
- where the adhesive layer has a shear module of less than 10 kPa.
Dependencies are inferred from the claim text.