High reliability display system

• US 6,540,363 B1
• Filed: 09/01/2000
• Issued: 04/01/2003
• Est. Priority Date: 09/01/2000
• Status: Expired due to Term

• Current Assignee: Rockwell Collins, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Rockwell Collins, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Steffensmeier, Martin J.
• Primary Examiner(s): Adams, Russell
• Assistant Examiner(s): Cruz, Magda
• Application Number:
  US09/654,309
• Time in Patent Office: 942 Days
• Field of Search: 353/31, 353/30, 353/44, 353/71, 353/79, 353/86, 353/85, 353/94, 353/122, 348/745, 348/751, 348/750, 348/806
• US Class Current: 353/31
• CPC Class Codes: G03B 21/006 using LCD's
• CPC Class Codes: H04N 9/3147 Multi-projection systems displays in general H04N9/12; video walls G06F3/1446, G09G2300/026

Abstract

A high-reliability display system is disclosed. The display system includes a plurality of projection channels. Each projection channel projects a substantially mutually exclusive portion of an image onto a display area. A controller determines the content and size of each portion that each projection channel projects onto the display area so that the image substantially fills the display area during normal conditions. When one of the projection channels is inoperative, the controller adjusts the portions of the image that are projected by the operative projection channels to optimize the image on the display area.

Claims

1. A display system, comprising:

a plurality of projection channels, each projection channel projecting a substantially mutually exclusive portion of an image onto a display area,

a controller that determines the content and size of each portion that each projection channel projects onto the display area so that the image substantially fills the display area during normal conditions;

wherein when one of the projection channels is inoperative, the controller adjusts the portions of the image that are projected by the operative projection channels to optimize the image on the display area.

2. The display system of claim 1, further including at least one light source that is configured to supply light to at least one of the projection channels.

3. The display system of claim 2, wherein the at least one light source includes an arc lamp.

4. The display system of claim 2, wherein the at least one light source includes a laser.

5. The display system of claim 2, wherein the at least one light source includes a light-attenuating device.

6. The display system of claim 5, wherein the light source is connected to the controller, and wherein the brightness of the light source is varied by the controller depending on how much of the image the projection channel is required to project.

7. The display system of claim 2, wherein each projection channel includes a light modulator that is connected to the controller and responsive to signals from the controller to modulate light from the at least one light source to form the portion of the image to be displayed by the projection channel.

8. The display system of claim 7, wherein each projection channel further includes a variably focusing lens assembly disposed between the light modulator and the display area and connected to the controller, wherein the variably focusing lens assembly is controlled by the controller to adjust the size of the portion of the image that is projected by the projection channel.

9. The display system of claim 8, wherein the controller further includes a content-controlling element that controls the content of the portion of the image that each projection channel projects, and further wherein the controller compensates for an inoperative projection channel by adjusting the content of the portions projected by the remaining operative channels.

10. The display system of claim 7, wherein the light modulator includes at least one liquid-crystal display (LCD).

11. A display system for projecting an image on a display area, the image having a size and a content, the system comprising:

a first projection channel that includes a first light modulator configured to modulate light to form a first portion of the image, and a first variably-focusable lens assembly that focuses the first portion of the image for display on the display area;

a second projection channel that includes a second light modulator configured to modulate light to form a second portion of the image, and a second variably-focusable lens assembly that focuses the second portion of the image for display on the display area;

a third projection channel that includes a third light modulator configured to modulate light to form a third portion of the image, and a third variably-focusable lens assembly that focuses the third portion of the image for display on the display area;

a controller that controls the first, second and third lens assemblies such that when the first, second and third projection channels are in an operative state, the first portion of the image is displayed on a first section of the display area, the second portion of the image is displayed on a second section of the display area, and the third portion of the image is displayed on a third section of the display area, wherein each of the first, second and third sections of the display area are substantially mutually exclusive and combine to cover substantially all of the display area, the controller being further configured so that, upon failure of one of the projection channels, the controller adjusts the portions of the image to be projected by the remaining operative channels by controlling the light modulators and the variably-focusing lens assemblies of the remaining operative projection channels to optimize the size and content of the image.

12. The display system of claim 11, further including at least one light source that is configured to supply light to at least one of the projection channels.

13. The display system of claim 12, wherein the at least one light source includes an arc lamp.

14. The display system of claim 12, wherein the at least one light source is a variable-brightness light source.

15. The display system of claim 14, wherein the variable-brightness light source is connected to the controller, and wherein the brightness of the light source is varied by the controller depending on how much of the image the projection channel is required to project.

16. The display system of claim 11, wherein each of the first, second and third light modulators include at least one liquid-crystal display.

17. A method of providing an image to a display screen, comprising:

providing a plurality of independent projection channels, each projection channel configured for modulating light to create a portion of the image and focusing the image on a section of the display screen;

determining the portion of the image that each projection channel is to project;

generating light for each projection channel;

modulating the light in each projection channel to produce each portion of the image;

focusing each portion of the image on a section of the display screen;

compensating for an inoperative projection channel by modifying the portions of the desired image that each operative projection channel is to project and by re-focusing each portion on the display screen, to thereby optimize the image that is displayed on the display screen.

18. The method of claim 17, wherein the inoperative projection channel is compensated for by enlarging the portions projected by the operative projection channels.

19. The method of claim 18, wherein the portions of the image are focused using an adjustable lens assembly, and wherein the portions projected by the operative projection channels are enlarged by controlling the adjustable lens assembly to zoom the portions of the image projected by the operative projection channels.

20. The method of claim 17, wherein each portion of the image has a content, and wherein the inoperative projection channel is compensated for by distributing the content of the inoperative projection channel among at least one of the operative projection channels.