IP Library › Granted Patent US 12,704,928
Granted Patent B2
US 12,704,928 · App. 19/268,227 · Granted Aug 11, 2026

Touch-sensing apparatus

Inventors: Håkan Bergström (Torna-Hällestad, SE); Tomas Svensson (Limhamn, SE)
Assignee: Flatfrog Laboratories AB
G06F3/0428G06F3/0421G06F2203/04103
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Quick Facts
Patent No.
US 12,704,928
App. No.
19/268,227
Filed
Jul 14, 2025
Granted
Aug 11, 2026
Kind
B2
Art Unit
2622
USPC
345/175
Abstract

A touch sensing apparatus is disclosed comprising a panel having a touch surface, emitters and detectors arranged along a perimeter, a light directing portion arranged adjacent the perimeter and comprising a light directing surface, the emitters and/or the detectors are arranged opposite a rear surface of the panel to emit and/or receive light through a channel in a frame element, the channel is arranged opposite the rear surface and extends in a direction of a normal axis of the touch surface, the light directing surface and the channel are arranged on opposite sides of the panel and overlap in the direction of the plane, the light directing surface receive light from the emitters, or direct light to the detectors, through the panel and through the channel, in the direction of the normal axis. A method of manufacturing a frame element for a touch sensing apparatus is disclosed.

Claims (43)

1 . A touch sensing apparatus comprising:

a panel that defines a touch surface extending in a plane having a normal axis,

a plurality of emitters and detectors arranged along a perimeter of the panel, and

a light directing portion arranged adjacent the perimeter and comprising a light directing surface,

wherein the emitters are arranged to emit light and the light directing surface is arranged to receive the light and direct the light across the touch surface,

wherein the plurality of emitters that are configured to emit light and/or the plurality of detectors that are configured to receive light through a channel in a frame element,

wherein the light directing surface and the channel are arranged on opposite sides of the panel, and

whereby the light directing surface receives light from the emitters, or directs light to the plurality of detectors, through the panel and through the channel, in the direction of the normal axis,

wherein the panel has edges extending between the touch surface and a rear surface of the panel,

wherein the channel extends in a direction parallel with the plane with a width between a first channel wall, arranged closest to a respective edge of the panel, and an opposite second channel wall, and

wherein the first channel wall extends with an angle towards the direction of the normal axis.

2 . The touch sensing apparatus according to claim 1 , wherein the frame element is formed of a metal, and any of the light directing surface, the first channel wall, and the second channel wall is a metal surface of the frame element.

3 . The touch sensing apparatus according to claim 2 , wherein the light directing surface is an anodized metal, an etched metal surface, a sand blasted metal surface, a bead blasted metal surface, or a brushed metal surface of the frame element for increasing surface roughness.

4 . The touch sensing apparatus according to claim 1 , wherein the light directing portion comprises an outer surface opposite the light directing surface, wherein the light directing surface has a higher reflectance than the outer surface.

5 . The touch sensing apparatus according to claim 1 , wherein the light directing surface diffusively reflects the light over the touch surface.

6 . The touch sensing apparatus according to claim 1 , wherein walls of the channel comprise a diffusive light scattering surface.

7 . The touch sensing apparatus according to claim 1 , wherein the emitters and/or detectors are mounted to a substrate,

wherein a support is attached to the substrate, the support extending in a direction parallel with the plane between the substrate and a frame wall of the frame element.

8 . The touch sensing apparatus according to claim 1 , wherein the panel having edges extending between the touch surface and the rear surface,

wherein the frame element forms a cavity,

wherein the emitters and/or detectors are mounted to a substrate and the substrate is arranged in the cavity so that the emitters and/or detectors are arranged closer to the respective edge of the panel than the substrate.

9 . The touch sensing apparatus according to claim 8 , wherein the cavity extends in a direction parallel with the plane with a width (d2) between a first frame wall, arranged closest to the respective edge of the panel, and an opposite second frame wall,

wherein the substrate is arranged in the cavity so that the emitters and/or detectors are arranged closer to the first frame wall than the second frame wall.

10 . The touch sensing apparatus according to claim 8 , wherein the substrate extends with an elongated shape in a direction of the normal axis.

11 . The touch sensing apparatus according to claim 1 , wherein the metal surface is concave towards the touch surface.

12 . The touch sensing apparatus according to claim 1 , wherein the light directing surface has a surface roughness defined by a slope RMS (Δq) between 0.1-0.25.

13 . The touch sensing apparatus according to claim 1 , wherein the light directing surface has a surface roughness defined by a slope RMS (Δq) between 0.13-0.20.

14 . The touch sensing apparatus according to claim 1 , wherein the light directing surface has a surface roughness defined by a slope RMS (Δq) between 0-0.1.

15 . The touch sensing apparatus according to claim 1 , wherein walls of the channel have a higher specular reflectance than the light directing surface.

16 . A touch sensing apparatus comprising:

a panel that defines a touch surface extending in a plane having a normal axis, a plurality of emitters and detectors arranged along a perimeter of the panel, and

a light directing portion arranged adjacent the perimeter and comprising a light directing surface,

wherein the plurality of emitters are arranged to emit light and the light directing surface is arranged to receive the light and direct the light across the touch surface,

the plurality of emitters that are configured to emit light and/or the plurality of detectors that are configured to receive light through a channel in a frame element,

the light directing surface receives light from the emitters, or directs light to the plurality of detectors, through the panel and through the channel, and

wherein the light directing surface extends from an edge portion of the light directing portion being arranged closest to the touch surface to a protrusion of the light directing portion, the protrusion extending in a direction parallel with the plane to shield ambient or stray light from being reflected towards the channel.

17 . A method of manufacturing a frame element of metal for a touch sensing apparatus, comprising

extruding the frame element to form a light directing portion being a metal surface of the frame element,

milling a wall portion of the frame element to form a channel so that, in use, a light directing surface of the light directing portion receives light from a plurality of emitters, or directs light to a plurality of detectors, through the channel,

wherein the channel extends in a direction parallel with the plane with a width between a first channel wall, arranged closest to a respective edge of the panel, and an opposite second channel wall, and

wherein the first channel wall extends with an angle towards the direction of the normal axis.

18 . The method according to claim 17 , comprising etching, or bead-blasting, or sand blasting the light directing surface.

19 . The method according to claim 18 , comprising milling a top portion of the extruded light directing portion so that a height (h) of the light directing portion above a touch surface of a panel, when arranged in the frame element, is reduced.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 6, 2026
From: BERGSTRÖM, HÅKAN; SVENSSON, TOMAS
To: FLATFROG LABORATORIES AB
Reel/Frame 075184/0488 →
Priority Claims (2)
SE 2030044-8 · Feb 10, 2020 · national
SE 2030335-0 · Nov 9, 2020 · national
Continuity (3)
Continuation 18429192 · Jan 31, 2024
Continuation 17759836 · Jan 25, 2021
Related Publication 20260010264A1 · Jan 8, 2026
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