DISPLAY DEVICE AND ELECTRONIC APPARATUS

• US 20080259051A1
• Filed: 01/30/2008
• Published: 10/23/2008
• Est. Priority Date: 03/12/2007
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: OTA, Hitoshi
• Application Number:
  US12/022,737
• Publication Number:
  US 20080259051A1
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means

Abstract

The invention provides a display device including: a light source that emits a plurality of light-source lights having intensities different from one another at points in time different from one another from a back side opposite a display surface that is pointed by pointing means toward the display surface; a detecting unit that is provided at the back side and functions to detect a plurality of reflected lights, which are obtained as a result of reflection of the plurality of light-source lights by the pointing means; and an identifying unit that identifies the position of the pointing means on the basis of each of a plurality of third images by calculating a finite difference value between brightness data of a first image that is generated on the basis of one reflected light among the plurality of reflected lights and brightness data of each of a plurality of second images that is generated on the basis of a plurality of other reflected lights among the plurality of reflected lights, the above-mentioned plurality of other reflected lights having an intensity that differs from that of the above-mentioned one reflected light, and then by generating each of the plurality of third images on the basis of the corresponding one of the plurality of calculated finite difference values.

Claims

1. A display device comprising:

a light source that emits a plurality of light-source lights having intensities different from one another at points in time different from one another from a back side opposite a display surface that is pointed by pointing means toward the display surface;

a detecting section that is provided at the back side and functions to detect a plurality of reflected lights, which are obtained as a result of reflection of the plurality of light-source lights by the pointing means; and

an identifying section that identify the position of the pointing means on the basis of each of a plurality of third images by calculating a finite difference value between brightness data of a first image that is generated on the basis of one reflected light among the plurality of reflected lights and brightness data of each of a plurality of second images that is generated on the basis of a plurality of other reflected lights among the plurality of reflected lights, the above-mentioned plurality of other reflected lights having an intensity that differs from that of the above-mentioned one reflected light, and then by generating each of the plurality of third images on the basis of the corresponding one of the plurality of calculated finite difference values.

2. The display device according to claim 1, wherein the identifying section identifies the position of the pointing means by calculating an average value of the respective center coordinates of image portions of the pointing means contained in the plurality of the third images.

3. The display device according to claim 1, further comprising:

a substrate that is provided between the light source and the display surface; and

a plurality of pixel units that constitutes a display region over the substrate,

wherein the detecting section has a plurality of light-sensitive elements each of which is formed inside a non-open region that provides isolation between one open region and another open region of the pixel units in the display region.

4. The display device according to claim 1, wherein the light source further functions as, in addition to its function as a detection light source, a display light source that emits display light for displaying an image in accordance with an image signal on the display surface.

5. The display device according to claim 1 wherein the light source includes light emitting diodes.

6. An electronic apparatus that is provided with the display device according to claim 1.