Reducing visibility of inter-screen gap in tiled display systems
Techniques and display systems that provide a tile display screen made up by adjacent constituent screens with a reduced level of visibility of a gap between two adjacent constituent screens.
1. A method for operating a tiled display screen that includes multiple constituent display screens placed next to one another to form a display screen array as a display screen, wherein two adjacent constituent display screens define a gap therebetween that does not produce an image such that outer surfaces of the adjacent constituent display screens include a dead area that does not display an image, the method comprising:
selecting a first stripe area of a first display screen of the multiple constituent display screens next to a first edge of the first display screen, the first stripe area comprising one or more pixels corresponding to a first set of normal pixel brightness values;
sending signals to increase the first set of normal pixel brightness values to a first set of boosted pixel brightness values during display operation;
selecting a second stripe area of a second display screen of the multiple constituent display screens that abuts the first display screen at the first edge of the first display screen, the second stripe area comprising one or more pixels corresponding to a second set of normal pixel brightness values; and
sending signals to increase the second set of normal pixel brightness values to a second set of boosted pixel brightness values during display operation,
wherein the first and second sets of boosted pixel values are varied dynamically based on images to be displayed locally near the gap between the first and second display screens, the first and second sets of boosted pixels being located next to the gap such that the outer surface corresponding to each of the first and second display screens includes (i) a boosted brightness area, laterally adjacent to the dead area where no light is emitted, that emits light of boosted brightness and (ii) a normal brightness area that emits light of normal brightness.
2. The method as in claim 1 , wherein:
the multiple constituent display screens are scanning laser beam display screens, and
the method comprises controlling optical power of each scanning laser beam when being scanned in the first and second stripe areas to achieve the boosted pixel brightness values of the first stripe area and the second stripe area to reduce visibility of the gap between the first and second display screens.
3. The method as in claim 1 , wherein:
each constituent display screen comprises parallel stripes of light-emitting materials that emit visible light by absorbing pump light at a different wavelength from the emitted visible light, and
the method comprises controlling optical power of the pump light in optically pumping the first and second stripe areas to achieve the boosted pixel brightness values of the first stripe area and the second stripe area to reduce visibility of the gap between the first and second display screens.
4. The method as in claim 1 , wherein selecting the first stripe area includes selecting one or more first edge pixels, and wherein selecting the second stripe area includes selecting one or more second edge pixels.
5. The method as in claim 4 , wherein a ratio of an edge pixel brightness after boosting the pixel value to an edge pixel brightness before boosting the pixel value is constant.
6. The method as in claim 1 , wherein dynamically varying the first and second sets of boosted pixel values based on images to be displayed locally near the gap between the first and second display screens includes dynamically varying in response to a Gamma correction function.
7. The method of claim 1 , wherein the first set of pixel brightness values is increased to the first set of boosted pixel brightness values according to a boost value, and wherein the second set of pixel brightness values is increased to the second set of boosted pixel brightness values according to the same boost value.
8. The method of claim 7 , wherein the boost value is a function of an area of a portion of the gap between the one or more pixels of the first stripe area and the one or more pixels of the second stripe area.
9. The method of claim 8 , wherein the boost value is a function of areas of the one or more pixels of the first and second stripe areas.
10. A method for operating a tiled display screen comprising multiple constituent display screens placed adjacent to one another to form a large display screen array, wherein two adjacent constituent display screens define a gap therebetween that does not produce an image such that outer surfaces of the adjacent constituent display screens include a dead area that does not display an image, the method comprising:
selecting a first stripe of a first display screen of the multiple constituent display screens in proximity to a first edge of the first display screen, the first stripe comprising a first image region having one or more pixels corresponding to a first set of pixel brightness values;
selecting a second stripe of a second display screen of the multiple constituent display screens in proximity to a second edge adjacent to the first display screen at the first edge of the first display screen, the second edge comprising a second image region in proximity to the first image region having one or more pixels corresponding to a second set of pixel brightness values; and
sending signals to dynamically adjust the first set of pixel brightness values relative to the second set of pixel brightness values based on local images to be displayed to reduce visibility of a gap between the first and second display screens, the first set of adjusted pixels being located next to the gap such that the outer surface corresponding to the first display screen includes an adjusted brightness area, laterally adjacent to the dead area where no light is emitted, that emits light of adjusted brightness.
11. The method as in claim 10 , comprising:
adjusting the pixel brightness values corresponding to both the first and the second image regions.
12. The method as in claim 10 , comprising:
controlling the first and second sets of pixel brightness values to be the same.
13. The method as in claim 10 , comprising:
controlling the first and second sets of pixel brightness values to be different.
14. The method as in claim 10 , wherein:
the first stripe is along a direction perpendicular to the gap between the first and second display screens.
15. The method as in claim 10 , wherein:
the first stripe is along a direction parallel to the gap between the first and second display screens.
16. The method as in claim 10 , comprising:
controlling the first set of pixel brightness values such that a first pixel brightness value at a first location of the first stripe varies from a second pixel brightness value at a second location of the first stripe.