Touch sensor having waveguides and display device including the touch sensor
AssigneeJapan Display Inc.
InventorHsiang-Yuan Cheng
Life of this patent
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Abstract
Disclosed is a touch sensor including a plurality of first optical waveguides arranged in a stripe form, a plurality of second optical waveguides located over the plurality of first optical waveguides, arranged in a stripe form, and intersecting the plurality of first optical waveguides, and an intermediate layer between the plurality of first optical waveguides and the plurality of second optical waveguides. Each of the plurality of first optical waveguides and the plurality of second optical waveguides includes a core including an elastomer as well as a clad in contact with the core other than side surfaces of the core perpendicular to a longitudinal direction of the core. The intermediate layer has a modulus of elasticity higher than that of the elastomer.
Claims17
A touch sensor comprising:
- a plurality of first optical waveguides arranged in a stripe form;
- a plurality of second optical waveguides over the plurality of first optical waveguides, the plurality of second optical waveguides being arranged in a stripe form and intersecting the plurality of first optical waveguides;
- and
- an intermediate layer between the plurality of first optical waveguides and the plurality of second optical waveguides,
- wherein each of the plurality of first optical waveguides and the plurality of second optical waveguides comprises:
- a core including an elastomer;
- and
- a clad in contact with the core other than side surfaces of the core perpendicular to a longitudinal direction of the core, and
- the intermediate layer has a modulus of elasticity higher than that of the elastomer.
A touch sensor comprising:
- a plurality of first optical waveguides arranged in a stripe form;
- and
- a plurality of second optical waveguides over the plurality of first optical waveguides, the plurality of second optical waveguides being arranged in a stripe form and intersecting the plurality of first optical waveguides,
- wherein:
- each of the plurality of first optical waveguides and the plurality of second optical waveguides comprises:
- a core including an elastomer;
- and
- a clad in contact with the core other than side surfaces of the core perpendicular to a longitudinal direction of the core;
- the touch sensor has a first region and a second region;
- the plurality of first optical waveguides and the plurality of second optical waveguides are located in the first region;
- light-emitting elements and light-detecting elements are located in the second region;
- and
- side surfaces of the plurality of first optical waveguides and the plurality of second optical waveguides perpendicular to a longitudinal direction thereof are each in contact with the respective light-emitting element and the respective light-detecting element at an interface between the first region and the second region.
A display device comprising:
- a touch sensor;
- and
- a display panel over the touch sensor, the display panel having a display region and a non-display region,
- wherein:
- the touch sensor comprises:
- a plurality of first optical waveguides arranged in a stripe form;
- a plurality of second optical waveguides over the plurality of first optical waveguides, the plurality of second optical waveguides being arranged in a stripe form and intersecting the plurality of first optical waveguides;
- and
- light-emitting elements and light-detecting elements in the non-display region;
- each of the plurality of first optical waveguides and the plurality of second optical waveguides comprises:
- a core including an elastomer;
- a clad in contact with the core other than side surfaces of the core perpendicular to a longitudinal direction of the core in at least the display region;
- and
- a reflection surface at an interface between the core and the clad;
- each of the plurality of first optical waveguides and the plurality of second optical waveguides is sandwiched by the respective light-emitting element and light-detecting element;
- and
- the display panel comprises:
- a substrate;
- and
- a display element over the substrate.
Dependencies are inferred from the claim text.