Self aligning imager array
Implementations described herein generally relate to scanning beam display systems and more specifically, to systems and methods for improved image alignment of such scanning beam display systems. The method comprises providing a display system comprising a display screen having a plurality of display screen region each with a corresponding light engine module having a servo laser beam and an excitation laser beam, scanning the servo laser beam of a light engine module in an outer scanning region outside of the light engine module's corresponding display screen region, detecting servo laser beam feedback light to measure an alignment error of the light engine module relative to the light engine module's corresponding display screen region, and adjusting alignment of the excitation laser beam based on the measured alignment error.
1. A scanning beam display system, comprising:
a continuous surface display screen comprising:
a plurality of layers; and
a plurality of reference marks disposed on at least one of the layers;
a first light engine module for conveying first image information by directing and emitting spatially controlled instances of excitation light in a first given area of the continuous surface display screen corresponding to the first light engine module;
a first servo system for determining placement of the emitted spatially controlled instances of excitation light in the first given area of the continuous surface display screen, wherein at least one reference mark of the plurality of reference marks is used to determine placement of the emitted excitation light in the first given area;
a second light engine module for conveying second image information by directing and emitting spatially controlled instances of excitation light in a second given area of the continuous surface display screen corresponding to the second light engine module; and
a second servo system for determining placement of the emitted spatially controlled instances of excitation light in the second given area of the continuous surface display screen, wherein at least one reference mark of the plurality of reference marks is used to determine placement of the emitted excitation light in the second given area;
a control unit operable to:
provide feedback signals to the first or second servo system;
access one or more alignment tables containing data representing physical parameters associated with the continuous surface display screen;
determine the correspondence between the determined placement of the emitted spatially controlled instances of excitation light in the first given area of the display screen and the determined placement of the emitted spatially controlled instances of excitation light in the second given area of the display screen;
instruct the first light engine module to convey an image first sub-image in the first given area of the display screen based on the feedback signals received by the servo systems, data contained in the alignment tables, and the determined correspondence between the determined placement of the emitted spatially controlled instances of excitation light in the first and second given areas of the display screen; and
instruct the second light engine module to convey the image second sub-image in the second given area of the display screen based on the feedback signals received by the servo systems, data contained in the alignment tables, and the determined correspondence between the determined placement of the emitted spatially controlled instances of excitation light in the first and second given areas of the display screen.
2. The system of claim 1 , wherein the first image information is rendered as a first pixel array and the second image information is rendered as a second pixel array.
3. The system of claim 2 , wherein the first pixel array and the second pixel array share common image information on one or more lines of pixels.
4. The system of claim 1 , wherein each servo system detects and relays spatial placement of specific light on a specific location of the continuous surface display screen.
5. The system of claim 4 , wherein each of the first servo system and the second servo system comprise:
a servo light source to produce at least one servo beam at a servo beam wavelength that is different from the excitation light wavelength; and
a servo detector positioned to receive reflected light of the servo beam and to produce a monitor signal indicative of positioning of the servo beam on the continuous surface display screen.
6. The system of claim 1 , wherein the first given sub-area and the second given area of the display screen comprises a continuous section of the display screen.
7. The system of claim 1 , wherein the first given area includes a first tilette and the second given area includes a second tilette adjacent to the first tilette.
8. The system of claim 7 , wherein the first given area further includes at least a portion of the second tilette.
9. The system of claim 1 , wherein the first given area includes a portion of a first tilette and the second given area includes a portion of the first tilette.
10. The system of claim 7 , wherein each tilette is a distinct panel comprising one or more columns, regions or dots of phosphor.
11. The system of claim 7 , wherein the reference marks are contained within the tilettes.
12. The system of claim 1 , wherein the continuous surface display screen comprises a plurality of contiguous tilettes.
13. The system of claim 1 , wherein the continuous surface display screen comprises a plurality of tilettes and each servo system determines the position of a tilette relative to the tilette's corresponding light engine module.
14. The system of claim 1 wherein the control unit is configured to:
detect first servo laser beam feedback light to determine a position of the first light engine module relative to an adjacent second display screen region;
detect second servo laser beam feedback light to determine a position of the second light engine module relative to the adjacent second display screen region; and
simultaneously image a portion of the adjacent second display screen region using an excitation laser beam emitted by a corresponding light engine module and a light engine module that corresponds to the adjacent display screen region.
15. A method for aligning a scanning beam display system, comprising:
providing a display system comprising a display screen having a plurality of display screen regions each with a corresponding light engine module having a servo laser beam and an excitation laser beam;
detecting first servo laser beam feedback light to measure an alignment error of the first light engine module relative to the first light engine module's corresponding display screen region;
detecting second servo laser beam feedback light to measure an alignment error of the second light engine module relative to the second light engine module's corresponding display screen region; and
adjusting alignment of the excitation laser beam of the first light engine and the excitation laser beam of the second light engine based on the corresponding measured alignment error of the first and second light engines.
16. The method of claim 15 , wherein an outer scanning region includes an adjacent display screen region.
17. The method of claim 16 , wherein detecting first or second servo laser beam feedback light comprises detecting servo laser beam feedback light reflected by reference marks positioned on the adjacent display screen region to determine a position of the servo laser beam.
18. The method of claim 17 , wherein the reference marks are selected from start of line reference marks, end of line reference marks, and vertical reference marks.
19. The method of claim 15 , wherein adjusting alignment of the excitation laser beam comprises at least one of shifting the excitation laser beam vertically by an adjustment of a galvo mirror and shifting the excitation laser beam horizontally by adjusting timing of a pulse on/off in conjunction with a known position of the excitation laser beam.
20. A method for aligning a scanning beam display system, comprising:
providing a display system comprising a display screen having a plurality of display screen regions each with a corresponding light engine module having a servo laser beam and an excitation laser beam;
detecting servo laser beam feedback light to determine a position of the first light engine module relative to an adjacent second display screen region;
detecting servo laser beam feedback light to determine a position of the second light engine module relative to the adjacent second display screen region; and
simultaneously imaging a portion of the adjacent second display screen region using an excitation laser beam emitted by a corresponding light engine module and a light engine module that corresponds to the adjacent display screen region.