Scanned beam system and method using a plurality of display zones

• US 7,486,255 B2
• Filed: 12/03/2004
• Issued: 02/03/2009
• Est. Priority Date: 07/21/2004
• Status: Active Grant

• Current Assignee: Microvision, Inc.
• Original Assignee: Microvision, Inc.
• Inventors: Jakuc, Maciej, Sprague, Randall B., Brown, Margaret K.
• Primary Examiner(s): Patel; Nitin
• Application Number:
  US11/003,128
• Publication Number:
  US 20060017655A1
• Time in Patent Office: 1,523 Days
• Field of Search: 345/1.1, 345/6, 345/7, 345/8, 345/55, 345/108, 345/1.2, 345/1.3, 345/3.2, 345/4, 345/5, 345/552, 345/565, 359/630, 347/250
• US Class Current: 345/7
• CPC Class Codes: G09G 3/02 by tracing or scanning a light beam on a screen
• CPC Class Codes: H04N 3/08 having a moving reflector
• CPC Class Codes: H04N 9/3129 scanning a light beam on the display screen scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161
• CPC Class Codes: H04N 9/3164 using multiple light sources
• CPC Class Codes: H04N 9/3182 Colour adjustment, e.g. white balance, shading or gamut white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607

Abstract

A scan assembly includes an emitter array containing a plurality of optical emitters. Each optical emitter generates a corresponding image beam and the scan assembly scans the image beams in a plurality of overlapping display zones. The overlap of adjacent image display zones forms blending zones and the scan assembly can modulate the intensities of the image beams as a function of the position of the image beams in the blending zones. This modulation for a given blending zone may be a linearly increasing intensity of a first image beam and a linearly decreasing intensity of a second image beam.

Claims

1. A scan assembly operable to generate a plurality of image beams and operable to scan the image beams in a plurality of overlapping display zones, wherein the scan assembly is operable to scan each of the image beams in a vertical direction and a horizontal direction, and wherein the scan assembly modulates an intensity of each of the image beams as a function of a vertical position of each image beam within the corresponding display zone.

2. The scan assembly of claim 1 wherein each image beam scans a corresponding display zone and adjacent display zones overlap to define blending zones, and wherein the scan assembly modulates an intensity of each image beam as a function of a position of the image beam within a corresponding blending zone.

3. The scan assembly of claim 2 wherein two image beams scan each blending zone, and wherein within each blending zone an intensity of a first corresponding image beam and an intensity of a second corresponding image beam are adjusted according to a blending algorithm.

4. The scan assembly of claim 3 wherein for each blending zone the blending algorithm linearly increases the intensity of the first corresponding image beam and linearly decreases the intensity of the second corresponding image beam.

5. The scan assembly of claim 1 wherein the scan assembly scans each of the image beams sinusoidally and bi-directionally in the horizontal direction and bi-directionally and approximately linearly in the vertical direction.

6. The scan assembly of claim 1 wherein the scan assembly scans each of the image beams sinusoidally and bi-directionally in both the horizontal and vertical directions.

7. A scan assembly including an emitter array containing a plurality of optical emitters, each optical emitter operable to generate a corresponding image beam and the scan assembly operable to scan the image beams in a plurality of overlapping display zones that collectively form a field of view, wherein each image beam scans a corresponding display zone in the field of view and adjacent display zones overlap to define blending zones, and wherein the scan assembly modulates an intensity of each image beam as a function of a position of the image beam within a corresponding blending zone.

8. The scan assembly of claim 7 wherein within a given blending zone an intensity of a first corresponding image beam is linearly increased while an intensity of a second corresponding image beam is linearly decreased.

9. The scan assembly of claim 7 wherein each optical emitter in the emitter array comprises a group of light emitting diodes.

10. The scan assembly of claim 9 wherein each group of light emitting diodes comprises two green SELEDs, one red SELED, and one blue SELED.

11. The scan assembly of claim 7 wherein the scan assembly is operable to scan each of the image beams in a vertical direction and a horizontal direction.

12. The scan assembly of claim 7 wherein the field of view corresponds to a screen onto which the scan assembly scans the image beams.

13. A scan assembly operable to generate a plurality of image beams and operable to scan each image beam through a corresponding display zone and at least one corresponding blending zone, and the scan assembly further operable to adjust an intensity of each image beam as a function of a position of the image beam in each corresponding blending zone, wherein two image beams scan each blending zone, and wherein within each blending zone an intensity of a first corresponding image beam and an intensity of a second corresponding image beam are adjusted according to a blending algorithm.

14. The scan assembly of claim 13 wherein the scan assembly adjusts the intensities of all the image beams within their corresponding blending zones in the same way.

15. The scan assembly of claim 13 wherein for each blending zone the blending algorithm a linearly increases the intensity of the first corresponding image beam and linearly decreases the intensity of the second corresponding image beam.

16. The scan assembly of claim 15 wherein the intensity for each image beam is given by an initial intensity multiplied by a blending coefficient B_coe that is defined by the following equations:

$B_{\mathrm{coe}}=\{\begin{array}{ccc}0& \mathrm{for}& Z_L-\frac{\mathrm{BZ}}{2}><br><br>Y<br><br><br><br>\mathrm{or}<br><br><br><br>Y><br><br>Z_H+\frac{\mathrm{BZ}}{2}\\ \frac{1}{2}-\frac{Z_L-Y}{\mathrm{BZ}}& \mathrm{for}& Z_L-\frac{\mathrm{BZ}}{2}<<br><br>Y\le <br><br>Z_L+\frac{\mathrm{BZ}}{2}\\ 1& \mathrm{for}& Z_L+\frac{\mathrm{BZ}}{2}<<br><br>Y\le <br><br><br><br>Z_H-\frac{\mathrm{BZ}}{2}\\ \frac{1}{2}-\frac{Y-Z_H}{\mathrm{BZ}}& \mathrm{for}& Z_H-\frac{\mathrm{BZ}}{2}<<br><br>Y\le <br><br>Z_H+\frac{\mathrm{BZ}}{2}\end{array}$

wherein BZ is a vertical height of each blending zone, Z_L is a zone low point of the corresponding display zone, Z_H is a zone high point of the display zone, and Y indicates a vertical position of the image beam within the display zone.

17. The scan assembly of claim 15 wherein the scan assembly is operable to scan each of the image beams in a vertical direction and a horizontal direction.

18. An image generator, comprising:

a beam generator operable to generate a plurality of image beams, wherein the beam generator comprises a plurality of groups of optical emitters, each group operable to generate a corresponding image beam; and

a scan assembly operable to scan the image beams in a plurality of overlapping display zones, wherein the scan assembly scans each image beam through a corresponding display zone, with adjacent display zones overlapping to define blending zones, and wherein the scan assembly provides an indication of a position of each image beam within a corresponding blending zone and the beam generator modulates an intensity of each image beam as a function of the position of the image beam within the blending zone.

19. The image generator of claim 18 wherein each group of optical emitters comprises a plurality of light emitting diodes, each light emitting diode operable to generate an individual beam and the individual beams from the light emitting diodes in the group collectively corresponding to the image beam for the group.

20. The image generator of claim 19 wherein the light emitting diodes in each group comprise two green SELEDs, one red SELED, and one blue SELED.

21. The image generator of claim 18 wherein two image beams scan each blending zone, and wherein within each blending zone an intensity of a first corresponding image beam and an intensity of a second corresponding image beam are adjusted according to a blending algorithm.

22. The image generator of claim 21 wherein for each blending zone the blending algorithm linearly increases the intensity of the first corresponding image beam and linearly decreases the intensity of the second corresponding image beam.

23. The image generator of claim 18 wherein the scan assembly is operable to scan each of the image beams in a vertical direction and a horizontal direction and the scan assembly provides an indication of a vertical position of each image beam, and wherein the beam generator modulates an intensity of each of the image beams as a function of the vertical position of each image beam within the corresponding display zone.

24. An image-display system, comprising:

a display screen; and

an image generator, including,

a beam generator operable to generate a plurality of image beams; and

a scan assembly operable to scan the image beams in a plurality of overlapping display zones on the display screen, wherein the scan assembly scans each image beam through a corresponding display zone, with adjacent display zones overlapping to define blending zones, and wherein the scan assembly provides an indication of a position of each image beam within a corresponding blending zone and the beam generator modulates an intensity of each image beam as a function of the position of the image beam within the blending zone.

25. The image-display system of claim 24 wherein the beam generator comprises a plurality of groups of optical emitters, each group operable to generate a corresponding image beam.

26. The image-display system of claim 25 wherein each group of optical emitter comprises a plurality of laser diodes, each laser diode operable to generate an individual beam and the individual beams from the laser diodes in the group collectively corresponding to the image beam for the group.

27. The image-display system of claim 24 wherein each group of optical emitters comprises a plurality of light emitting diodes, each light emitting diode operable to generate an individual beam and the individual beams from the light emitting diodes in the group collectively corresponding to the image beam for the group.

28. The image-display system of claim 27 wherein the light emitting diodes in each group comprise two green SELEDs, one red SELED, and one blue SELED.

29. A method of scanning image beams, comprising:

generating a plurality of image beams;

scanning each image beam through a corresponding display zone;

scanning each image beam through a blending zone, wherein scanning each image beam through a blending zone comprises scanning first and second image beams through the corresponding blending zone, and wherein adjusting an intensity of each image beam as a function of a position of the image beam in the blending zone comprises adjusting the intensities of the first and second image beams according to a blending algorithm; and

adjusting an intensity of each image beam as a function of a position of the image beam in the blending zone.

30. The method of claim 29 wherein the blending algorithm for at least one blending zone linearly increases the intensity of the first corresponding image beam and linearly decreases the intensity of the second corresponding image beam as a function of a vertical position of the image beam within the blending zone.

31. The method of claim 29 wherein the operations of scanning comprise scanning each image beam sinusoidally and bi-directionally in a horizontal direction and bi-directionally and approximately linearly in a vertical direction.

32. The method of claim 29 wherein the operations of scanning comprise scanning each image beam sinusoidally and bi-directionally in both a horizontal and a vertical direction.

33. A method of scanning image beams, comprising:

generating a plurality of image beams; and

scanning the image beams in a plurality of overlapping display zones that collectively form a field of view, wherein overlapping portions of adjacent display zones form blending zones, and wherein the operation of scanning further comprises modulating an intensity of each image beam in a corresponding blending zone as a function of a position of the image beam within the blending zone.

34. The method of claim 33 wherein within a given blending zone the intensity of a first corresponding image beam is linearly increased while the intensity of a second corresponding image beam is linearly decreased.

35. The method of claim 34 wherein the operation of scanning comprises scanning each of the image beams in a vertical direction and a horizontal direction.