Touch-Sensitive Display Device And Method

• US 20100085328A1
• Filed: 10/08/2008
• Published: 04/08/2010
• Est. Priority Date: 10/08/2008
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Suggs, Bradley
• Application Number:
  US12/247,784
• Publication Number:
  US 20100085328A1
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G06F 3/037 using the raster scan of a cathode-ray tube [CRT] for detecting the position of the member, e.g. light pens cooperating with CRT monitors
• CPC Class Codes: G06F 3/042 by opto-electronic means

Abstract

Apparatus for providing a touch-sensitive display are provided. A touch-sensitive display apparatus can include a first layer comprising a plurality of emitters disposed thereupon and a second layer comprising a screen for the display of images visible to the human eye. A first portion of the emitters can emit electromagnetic radiation at one or more first wavelengths invisible to the human eye. The electromagnetic radiation at the first wavelength can be partially or completely transmissible through the second layer. A user can dispose an object proximate to the second layer, causing the reflection of all or a portion of the electromagnetic radiation therefrom. The remaining portion of the emitters can absorb all or a portion of the reflected electromagnetic radiation at the first frequency.

Claims

1. A touch-sensitive display device comprising:

a first layer comprising a plurality of emitters disposed in a grid or matrix,

wherein, a first portion of the emitters emit electromagnetic energy at one or more first wavelengths invisible to the human eye; and

,

wherein, a second portion of the emitters absorb incident electromagnetic energy at one or more first wavelengths; and

,

wherein, the second portion of the emitters generate a voltage signal proportionate to the incident electromagnetic energy;

a second layer comprising screen for the display of images visible to the human eye,

wherein the one or more first wavelengths are partially or completely transmissible through the second layer; and

,

wherein the second layer is disposed between the first layer and a user; and

,

wherein all or a portion of the electromagnetic energy at the one or more first wavelengths is reflected from the second layer to the first layer when the user passes one or more objects in front of the second layer.

2. The touch-sensitive display of claim 1, wherein the one or more first wavelengths comprise one or more infrared wavelengths from about 800 nm to about 1,000 nm.

3. The touch-sensitive display of claim 1, wherein the plurality of emitters comprise a plurality of infrared light emitting diodes.

4. The touch-sensitive display of claim 1, wherein the second layer comprises a liquid crystal display, a plasma display, a penetron display, or any combination thereof.

5. The touch-sensitive display of claim 1, wherein the one or more objects comprise, a finger, a stylus, a pointer, an IR emitter, or any combination thereof.

6. A method for providing a touch-sensitive display, comprising:

disposing a plurality of emitters in a grid or matrix, thereby forming a first layer;

dividing the plurality of emitters into a first portion comprising one or more transmitters and a second portion comprising one or more receivers;

disposing a second layer suitable for the display of images visible to the human eye between the first layer and a user;

emitting electromagnetic energy at a first frequency using the first portion of the plurality of emitters,

wherein the electromagnetic energy is invisible to the human eye; and

wherein all or a portion of the electromagnetic energy at the one or more first frequencies is partially or completely transmissible through the second layer; and

wherein no power is applied to the second portion of the plurality of emitters;

passing an object across the second layer,

wherein all or a portion of the electromagnetic energy at the one or more first frequencies transmitted through the second layer is partially or completely reflected by the object; and

measuring the reflected electromagnetic energy using the second portion of the plurality of emitters to generate a voltage signal.

7. The method of claim 6, wherein the emitters comprise IR LEDs, UVA LEDs, or any combination thereof.

8. The method of claim 6, wherein the one or more first wavelengths comprise one or more infrared wavelengths from about 800 nm to about 1,000 nm.

9. The method of claim 6, wherein the second portion of emitters provide a voltage signal proportionate to the quantity of electromagnetic energy incident upon one or more of the second portion of emitters.

10. The method of claim 6, wherein the plurality of emitters comprise a plurality of infrared light emitting diodes.

12. The method of claim 6, wherein the second layer comprises a liquid crystal display, a plasma display, a penetron display, or any combination thereof.

13. The method of claim 6, wherein the one or more objects comprise, a finger, a stylus, a pointer, an IR emitter, or any combination thereof.

14. A touch-sensitive display apparatus, comprising:

a housing comprising an enclosure having at least one side fully or partially open and a first layer and a second layer disposed therein;

wherein the first layer comprises a plurality of infrared light emitting diode emitters,

wherein a first portion of the emitters are powered; and

wherein when powered, the first portion of the emitters emit electro-magnetic energy at an infrared wavelength of from about 800 nm to about 1,000 nm; and

,

wherein a second portion of the emitters are unpowered; and

wherein when unpowered, the second portion of the emitters absorb reflected electromagnetic energy at an infrared wavelength of from about 800 nm to about 1,000 nm; and

wherein the second layer forms at least a portion of the open side of the enclosure; and

,

wherein the second layer comprises a liquid crystal display for the display of images at one or more second, visible light, wavelengths of from about 300 nm to about 790 nm,

wherein the infrared electromagnetic energy generated by the plurality of emitters is partially or completely transmissible through the liquid crystal display forming the second layer; and

,

wherein all or a portion of the infrared electromagnetic energy is reflected from the second layer back to the first layer from one or more objects disposed proximate to the second layer.

15. The apparatus of claim 14, wherein the ratio of the number of emitters in the first portion to the number of detectors in the second portion is a minimum of about four to one (4:

1).