Holographic display panel for a vehicle windshield

• US 4,790,613 A
• Filed: 01/06/1987
• Issued: 12/13/1988
• Est. Priority Date: 01/06/1987
• Status: Expired due to Fees

• Current Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Original Assignee: Hughes Aircraft Company (Rtx Corporation)
• Inventors: Moss, Gaylord E.
• Primary Examiner(s): ARNOLD, BRUCE
• Application Number:
  US07/000,790
• Time in Patent Office: 707 Days
• Field of Search: 350/3.7, 350/174, 350/3.85
• US Class Current: 340/461
• CPC Class Codes: G02B 2027/0107 with optical power
• CPC Class Codes: G02B 2027/0109 comprising details concerning the making of holograms
• CPC Class Codes: G02B 2027/0145 creating an intermediate image
• CPC Class Codes: G02B 27/0103 comprising holographic elements
• CPC Class Codes: G03H 1/0408 Total internal reflection [TIR] holograms, e.g. edge lit or substrate mode holograms
• CPC Class Codes: G03H 1/22 Processes or apparatus for obtaining an optical image from holograms G03H1/26 - G03H1/34 take precedence
• CPC Class Codes: G03H 1/2286 Particular reconstruction light G03H1/24 takes precedence; Beam properties
• CPC Class Codes: G03H 2001/0428 Image holography, i.e. an image of the object or holobject is recorded G03H1/0406 takes precedence; holographic microscope G03H2001/005
• CPC Class Codes: G03H 2001/043 Non planar recording surface, e.g. curved surface
• CPC Class Codes: G03H 2001/2231 Reflection reconstruction
• CPC Class Codes: G03H 2001/2615 in physical contact, i.e. layered holograms
• CPC Class Codes: G03H 2001/266 Wavelength multiplexing
• CPC Class Codes: G03H 2270/14 Plastic

Abstract

An improved hologram display panel for a vehicle is provided. Sensors can monitor the operating characteristics of the vehicle and virtual images of indicators can be realized by the illumination of holographic images that are contained in substantially transparent hologram members laminated to the surface of the windshield. The holographic images are virtual image displays that can appear offset from the windshield to accommodate the vision of the driver. A hologram barrier means may be provided to prevent activation of the hologram display by ambient light.

Claims

1. An improved display panel for a vehicle having a windshield comprising:

means for monitoring an operating characteristic of the vehicle;

means for providing an indication of the status of the vehicle operating characteristic including a substantially transparent hologram member mounted adjacent and in the line of sight of the windshield and having a predetermined indicia indicative of the specific status, the transparent hologram member includes an indicia of a virtual image that appears to be realized at a location offset and exterior of the windshield to facilitate viewing by far-sighted drivers, and

means to illuminate the indicia indicative of a certain corresponding status.

2. The invention of claim 1 wherein the means for monitoring includes a sensor member and the means for providing an indication includes means for determining the status of the sensor and activating a corresponding illumination of a hologram member indicative of that status.

3. The invention of claim 1 wherein the hologram member includes a transparent flexible substrate suitable for lamination to a windshield, a first film layer of a holographic material recording the image and a protective exterior coating to provide abrasive resistance.

4. The invention of claim 3 wherein the hologram member includes a second film layer of holographic material supporting a second image to reflect stray light to prevent inadvertent activation of the image in the first film layer.

5. The invention of claim 1 wherein the means for illuminating includes a fiber optic connector and a light source at one end of the fiber optic connector.

6. An improved windshield and display panel combination for providing an indication of the operating conditions of certain functions of a vehicle to the driver with virtual images, comprising:

means for providing an indication of the status of the operating condition with a number of substantially transparent hologram members laminated to the windshield to provide a plurality of predetermined holographic images, each image representative of a wavefront of a predetermined indicia whose virtual image is realized as appearing offset from the windshield and to the exterior of the windshield when appropriately illuminated; and

means for illuminating the holographic images to indicate the operating condition, wherein the hologram members while configured to simulate the curvature of the windshield location to which they are to be laminated.

7. The invention of claim 6 wherein the means for illuminating includes a fiber optical link, a source light and a projection lens.

8. The invention of claim 6 wherein the hologram members have dual film layers of holographic material.

9. An improved display panel system for a vehicle having a windshield comprising:

means for monitoring operating characteristics of the vehicle;

hologram means for providing an indication of the status of the monitored operating characteristics including a substantially transparent hologram member laminated to the windshield to provide a plurality of predetermined holographic images, each image representative of a wavefront of a predetermined indicia whose virtual image is realized as appearing offset from the windshield when appropriately illuminated;

hologram barrier means for isolating each holographic image from activation by ambient light; and

means for illuminating the holographic indicia images in response to the monitoring means with reconstruction light beams of predetermined angular characteristics.

10. An improved display panel system for a vehicle having a windshield comprising:

means for monitoring operating characteristics of the vehicle;

hologram means for providing an indication of the status of the monitored operating characteristics including a substantially transparent hologram member laminated to the windshield to provide a plurality of predetermined holographic images, each image representative of a wavefront of a predetermined indicia whose virtual image is realized when appropriately illuminated; and

means for illuminating the holographic indicia images in response to the monitoring means with reconstruction light beams that are transmitted from an edge of the hologram member through the hologram member.

11. The invention of claim 10 wherein the vehicle has a mounting member, such as a dashboard member, adjacent one surface of the windshield and the hologram member is laminated so that a bottom edge of the hologram member extends beneath a surface of the dashboard member and the means for illuminating is connected to the edge of the hologram member beneath the surface of the dashboard member.

12. The invention of claim 10 wherein the means for monitoring includes a sensor member and the means for providing an indication includes means for determining the status of the sensor and activating a corresponding illumination of a hologram member indicative of that status.

13. The invention of claim 10 wherein the transparent hologram member includes an indicia of a virtual image that appears to be realized at a location offset from the windshield.

14. The invention of claim 10 wherein the hologram member includes a transparent flexible substrate suitable for lamination to a windshield, a first film layer of a holographic material recording the image and a protective exterior coating to provide abrasive resistance.

15. The invention of claim 10 wherein the means for illuminating includes a fiber optic connector and a light source at one end of the fiber optic connector.

16. The invention of claim 10 wherein the hologram member has a characteristic of recording the image while configured to simulate the curvature of the windshield location to which it is to be laminated.

17. In a holographic display system for activating a virtual image, the improvement comprising:

a substantially transparent hologram member within the visible spectrum of light having a developed holographic image representative of a wavefront of a predetermined indicia whose virtual image is activated when appropriately illuminated by a reconstruction reference beam;

hologram barrier means for isolating the holographic image from activation by ambient light, and

means for illuminating the holographic image to activate the virtual image.

18. The invention of claim 17 wherein the virtual image is a reflective surface.

19. The invention of claim 17 wherein the virtual image is a predetermined indicia that is realized by the reference beam.

20. The invention of claim 17 wherein a composite holographic image is provided and the means for illumination includes different wavelengths of reference beams to activate different portions of the composite holographic image.

21. The invention of claim 17 wherein the means for illuminating includes a fiber optical coupling system that is attached to the edge of the hologram member.

22. The invention of claim 17 further including means for removing any distortion of any mounting of the hologram member on a non-planar surface.

23. An improved display panel for a vehicle having a windshield comprising:

means for monitoring an operating characteristic of the vehicle;

means for providing an indication of the status of the vehicle operating characteristic including a substantially transparent hologram member mounted adjacent and in a line of sight through the windshield and having a predetermined indicia indicative of the specific status, wherein the hologram member includes a transparent flexible substrate suitable for lamination to a windshield, a first film layer of a holographic material recording the image and a second film layer of holographic material to reflect stray light to prevent inadvertent activation of the image in the first film layer, and

means to illuminate the hologram indicia indicative of a certain corresponding status.

24. The invention of claim 23 wherein the hologram member includes a protective exterior coating to provide abrasive resistance.

25. The invention of claim 23 wherein the means for illuminating includes a fiber optic connector and a light source at one end of the fiber optic connector.

26. The invention of claim 23 wherein the hologram member is recorded while configured to simulate the curvature of the windshield location to which it is to be laminated.

27. An improved display panel system for a vehicle having a windshield comprising:

means for monitoring operating characteristics;

hologram means for providing an indication of the status of the monitored operating characteristics including a substantially transparent hologram member laminated to the windshield to provide a plurality of predetermined holographic images, each image representative of a wavefront of a predetermined indicia whose virtual image is realized when appropriately illuminated, wherein the hologram member includes a transparent flexible substrate suitable for lamination to a windshield, a first film layer of a holographic material for recording the images, and a second film layer of holographic material to reflect stray light to prevent inadvertent activation of the images in the first film layer, and

holographic means for illuminating the holographic indicia images in response to the monitoring means with reconstruction light beams that are transmitted from an edge of the hologram member through the hologram member to contact the holographic images.

28. The invention of claim 27 wherein the means for monitoring includes a sensor member and the means for providing an indication includes means for determining the status of the sensor and activating a corresponding illumination of a hologram member indicative of that status.

29. The invention of claim 27 wherein the transparent hologram member includes an indicia of a virtual image that appears to be realized at a location offset from the windshield.