PORTABLE ELECTRONIC DEVICE WITH TOUCH SCREEN

• US 20080278462A1
• Filed: 12/04/2007
• Published: 11/13/2008
• Est. Priority Date: 05/09/2007
• Status: Abandoned Application

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: CHANG, JEN-TSORNG
• Application Number:
  US11/950,383
• Publication Number:
  US 20080278462A1
• Time in Patent Office: Days
• US Class Current: 345/179
• CPC Class Codes: G06F 1/1626 with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
• CPC Class Codes: G06F 1/1686 the I/O peripheral being an integrated camera
• CPC Class Codes: G06F 3/03545 Pens or stylus
• 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 portable electronic device with a simulation touch screen includes a main body, a display screen, a stylus, a camera unit and a processing unit. The display screen is mounted on the main body. The stylus is used for controlling movement of a cursor on the display screen. The stylus has a light source for generating a light spot on the display screen. The stylus is configured for controlling movement of a cursor on the display screen. The camera unit is electrically connected with the main body and faces the display screen. The camera unit is configured for capturing images of the display screen and the light spot thereon. The processing unit is mounted in the main body and electronically coupled to the camera unit.

Claims

1. A portable electronic device comprising:

a main body;

a display screen mounted on the main body;

a stylus for controlling movement of a cursor on the display screen, the stylus having a light source for generating a light spot on the display screen;

a camera unit electrically connected with the main body and facing the display screen, the camera unit being configured for capturing images of the display screen and the light spot thereon;

a processing unit mounted in the main body and electronically coupled to the camera unit, the processing unit being configured for receiving the images from the camera unit at a predetermined frequency, analyzing changes between the images caused by a movement of the stylus, processing and transforming the changes into a control signal to control movement of the cursor on the display screen in response to the movement of the stylus.

2. The portable electronic device as described in claim 1, wherein the light source is configured for emitting visible light toward the display screen, the visible light having a flicker frequency, the display screen having a vertical scanning frequency, and the camera unit having a frame frequency, the frame frequency being less than the vertical scanning frequency and greater than the flicker frequency.

3. The portable electronic device as described in claim 1, wherein the light source is configured for emitting infrared light, the camera unit including an infrared sensor for sensing infrared light emitted from the light source, thus capturing images of the light spot.

4. The portable electronic device as described in claim 1, wherein the stylus includes an elongated stylus main body and the light source, the light source comprising a round-shaped tip portion.

5. The portable electronic device as described in claim 1, wherein the light source is selected from a group consisting of visible light emitting diode and an infrared light emitting diode.

6. The portable electronic device as described in claim 4, wherein the stylus includes a battery disposed in the stylus main body for supplying electric energy to the light source.

7. The portable electronic device as described in claim 4, wherein the light source is electrically connected to the main body.

8. The portable electronic device as described in claim 4, wherein the stylus comprises a power supply contact for electrical connection to a power source, and a spring member for applying a force on the light source in a direction toward the power supply contact, the light source being engaged in the stylus main body and lengthwise movable therein, the light source comprising a light emitting diode, an electrical lead with a first end thereof electrically connecting with the light emitting diode and an opposite second end for electrical connection to the power supply contact.

9. The portable electronic device as described in claim 8, wherein the power supply contact is electrically connected to the main body.