Display source
First Claim
1. A method of modifying a display apparatus by replacing in the display apparatus a first reflective image generator having first mechanical or optical properties with a second reflective image generator having second mechanical or optical properties, the display apparatus including:
- a primary relay lens arrangement having a fixed focal length;
a visor;
a display source arranged to image the primary relay lens arrangement;
wherein the primary relay lens arrangement is arranged to transmit the image from the display source to the visor; and
wherein the display source includes;
a first image generator arranged to generate an image; and
a first display source relay optical arrangement;
wherein the first image generator is arranged to image the first display source relay optical arrangement; and
the first display source relay optical arrangement has a first focal length which is selected according to the first mechanical or optical properties to transmit a correctly sized image to the primary relay lens arrangement;
the method comprising;
replacing the first image generator with a second different image generator; and
replacing the first display source relay optical arrangement with a second different display source relay optical arrangement having a second different focal length which is selected according to the second different mechanical or optical properties to transmit a correctly sized image to the primary relay lens arrangement, andwherein the display apparatus further comprises a first output screen arrangement for matching a first numerical aperture of the first display source relay optical arrangement with a numerical aperture of the primary relay lens arrangement, the method comprising replacing the first output screen arrangement with a second different output screen arrangement which matches a second different numerical aperture of the second different display source relay optical arrangement with the numerical aperture of the primary relay lens arrangement.
1 Assignment
0 Petitions
Accused Products
Abstract
A helmet mounted display 30 includes a display source 31 arranged to be directly imaged by a primary relay optical arrangement 32 having relay optical elements 33A, 33B and 33C. Light exiting the primary relay optical arrangement 32 indicated by ray traces 34A, 34B and 34C continue towards a visor 35 which is arranged to reflect incident light to a exit pupil located in a convenient position for a viewer 36.
The display source 31 includes a light source, beam splitter, reflective liquid crystal display and a display source relay optical arrangement to provide an output image at an output diffuser screen. The image at the output screen is then directly imaged by the primary relay optical arrangement 32.
Should the reflective liquid crystal display require modification or replacement with a newer model, then the display source 31 can be redesigned to accommodate the new reflective liquid crystal display rather than re-engineering the primary relay optical arrangement 32 at greater expense.
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Citations
15 Claims
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1. A method of modifying a display apparatus by replacing in the display apparatus a first reflective image generator having first mechanical or optical properties with a second reflective image generator having second mechanical or optical properties, the display apparatus including:
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a primary relay lens arrangement having a fixed focal length; a visor; a display source arranged to image the primary relay lens arrangement; wherein the primary relay lens arrangement is arranged to transmit the image from the display source to the visor; and wherein the display source includes; a first image generator arranged to generate an image; and a first display source relay optical arrangement; wherein the first image generator is arranged to image the first display source relay optical arrangement; and the first display source relay optical arrangement has a first focal length which is selected according to the first mechanical or optical properties to transmit a correctly sized image to the primary relay lens arrangement; the method comprising; replacing the first image generator with a second different image generator; and replacing the first display source relay optical arrangement with a second different display source relay optical arrangement having a second different focal length which is selected according to the second different mechanical or optical properties to transmit a correctly sized image to the primary relay lens arrangement, and wherein the display apparatus further comprises a first output screen arrangement for matching a first numerical aperture of the first display source relay optical arrangement with a numerical aperture of the primary relay lens arrangement, the method comprising replacing the first output screen arrangement with a second different output screen arrangement which matches a second different numerical aperture of the second different display source relay optical arrangement with the numerical aperture of the primary relay lens arrangement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification