DISPLAY APPARATUS

• US 20100188368A1
• Filed: 06/30/2008
• Published: 07/29/2010
• Est. Priority Date: 07/02/2007
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Hendriks, Bernardus Hendrikus Wilhelmus, Mihajlovic, Nenad, Presura, Cristian, Suijver, Jan Frederik, Destura, Galileo June
• Application Number:
  US12/667,059
• Publication Number:
  US 20100188368A1
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G06F 3/0321 by optically sensing the absolute position with respect to a regularly patterned surface forming a passive digitiser, e.g. pen optically detecting position indicative tags printed on a paper sheet constructional details of pen-shaped pointing devices G06F3/03545, G06F3/03542, G06F3/037
• CPC Class Codes: G06F 3/03545 Pens or stylus

Abstract

Touch screen capabilities are added to a color display (10), such as an LCD display with backlighting. Thereto, the wavelength is varied in two color channels along the horizontal (x) and vertical (z) directions. A pen (30) having spectroscopic capabilities incorporated in it for the two relevant colors determines its position by measuring the wavelengths of the two channels.

Claims

1. Apparatus (10) for displaying an image on a screen (20) comprising light emitting means (40) for emitting a light component that varies as a function of the position on the screen (20) from which the light component is emitted.

2. Apparatus (10) according to claim 1 wherein the light component is a wavelength.

3. Apparatus (10) according to claim 2 wherein the light component corresponds to a color channel.

4. Apparatus (10) according to claim 2 wherein the light emitting means (40) comprise a plurality of light sources, for emitting the light component with mutually different wavelengths.

5. Apparatus (10) according to claim 2 wherein the light emitting means (40) comprise a plurality of light sources for emitting light with substantially the same wavelength and an optical filter (70) with properties varying as a function of the screen position, so that the wavelength of the light component varies as a function of the position on the screen from which the light component is transmitted.

6. Apparatus (10) according to claim 5 wherein a transmission spectrum of the optical filter (70) is sharper than a transmission spectrum of the plurality of light sources.

7. Apparatus (10) according to claim 5 wherein the light sources are backlights.

8. Apparatus (10) according to claim 2 wherein the light component varies as a function of the position on the screen (20) along a first direction (x) of the screen and wherein the light emitting means (40) are adapted for emitting a further light component with a wavelength that varies as a function of the position on the screen (20) along a second direction (z) of the screen, perpendicular to the first direction (x).

9. Apparatus (10) according to claim 8 wherein the light component corresponds to a first color channel and the further light component corresponds to a second color channel.

10. Apparatus (10) according to claim 9 wherein the light component comprises the shortest wavelengths of the basic color blue and the further light component comprises the longest wavelengths of the basic color red.

11. Apparatus (10) according to claim 1, wherein the light component is a flickering frequency.

12. Apparatus (10) according to claim 1, comprising means (50) for determining a position or orientation of a device (30) with respect to the screen (20), based on at least the detected light component at the device (30).

13. Device (30) for interacting with the apparatus (10) according to claim 1 comprising means (35) for detecting at least the light component emitted by the apparatus (10).

14. Device (30) according to claim 13 wherein the light component is a wavelength.

15. Device (30) according to claim 13 wherein the light component is a flickering frequency.

16. Device (30) according to claim 13 comprising means (50) for determining a position or orientation of the device (30) with respect to the screen (20) of the apparatus (10), based on at least the detected light component.

17. Device (30) according to claim 13 comprising touch sensing means for sensing a touch of the screen (20) by the device (30).

18. System comprising an apparatus (10) for displaying an image on a screen (20) comprising light emitting means (40) for emitting a light component that varies as a function of the position on the screen 20 from which the light component is emitted and a device (30) according to claim 14.

19. Method for determining a position or an orientation of a device (30) with respect to the screen (20) of an apparatus (10) for displaying an image comprising the steps of:

emitting a light component by the apparatus (10), that varies as a function of the position on the screen (20) from which the light component is emitted,

detecting by the device (30) of at least the light component emitted by the apparatus (10) and

determining the position or orientation of the device (30) with respect to the screen (20) of the apparatus, based on at least the detected light component.