Multi-touch sensing apparatus using rear view camera of array type

• US 9,870,100 B2
• Filed: 07/16/2015
• Issued: 01/16/2018
• Est. Priority Date: 06/16/2009
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Yi, Kwon Ju, Choi, Chang Kyu, Han, Jae Joon, Park, Du-Sik, Kim, Woon Bae, Kwon, Jong Oh
• Primary Examiner(s): Yang, Kwang-Su
• Application Number:
  US14/801,117
• Publication Number:
  US 20150324064A1
• Time in Patent Office: 915 Days
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 3/041661 using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window
• CPC Class Codes: G06F 3/0425 using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected tracking a projected light spot to determine a position on a display surface G06F3/0386

Abstract

A multi-touch sensing apparatus using a rear view camera of an array type is provided. The multi-touch sensing apparatus may include a display panel to display an image, a sensing light source to emit light to sense a touch image which is generated by an object and displayed on a back side of the display panel, and a camera to divide and sense the touch image. The camera may be arranged in an edge of a lower side of the multi-touch sensing apparatus, or a mirror to reflect the touch image may be included in the multi-touch sensing apparatus.

Claims

1. A multi-touch sensing apparatus, comprising:

a display panel arranged on an upper side of the multi-touch sensing apparatus, and configured to display an output image;

a sensing light source configured to emit a first light to sense a touch image generated by touch of an object on a front side of the display panel and displayed on a back side of the display panel;

a mirror configured to reflect the touch image;

a camera configured to sense the reflected touch image; and

a backlight configured to emit a second light to display the output image on the display panel,

wherein the mirror reflects the second light toward the display panel and decreases a distance between the camera and the back side of the display panel by being disposed on an edge of a lower side of the multi-touch sensing apparatus,

wherein the camera is arranged under the display panel and inside the multi-touch sensing apparatus, and

wherein the camera is configured to divide the touch image reflected by the mirror and sense one of the divided touch images.

2. The multi-touch sensing apparatus of claim 1, wherein the mirror is inclined by a predetermined angle with respect to the edge of the lower side of the multi-touch sensing apparatus.

3. The multi-touch sensing apparatus of claim 2, wherein the mirror comprises a plane mirror, a concave mirror, or a convex mirror.

4. The multi-touch sensing apparatus of claim 1, further comprising a transparent layer at the front side of the display panel, wherein the sensing light source is arranged to emit the first light to an inside of the transparent layer, and the transparent layer generates a total internal reflection of the first light emitted from the sensing light source.

5. The multi-touch sensing apparatus of claim 4, wherein the camera is configured to identify a location where the total internal reflection of the first light, emitted from the sensing light source, is frustrated by the object, and is configured to sense the touch image corresponding to the identified location.