Mirror with built-in display

• US 7,379,243 B2
• Filed: 02/17/2003
• Issued: 05/27/2008
• Est. Priority Date: 03/18/2002
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Horsten, Jan Baptist Adrianus Maria, Cornelissen, Hugo Johan, Broer, Dirk Jan, Van Herk, Johannes Johanna, Lazeroms, Markus Cornelis Jakobus
• Primary Examiner(s): Allen; Stephone B.
• Assistant Examiner(s): Chapel; Derek S.
• Application Number:
  US10/507,730
• Publication Number:
  US 20050185278A1
• Time in Patent Office: 1,926 Days
• Field of Search: 359/487, 359/494, 359/495, 359/497, 359/501, 359/246, 359/247, 359/250, 359/256, 359/629, 349/96, 349/194, 362/19, 353/20
• US Class Current: 359/320
• CPC Class Codes: G02B 5/08 Mirrors vehicle mirrors involving special optical features B60R1/08
• CPC Class Codes: G02F 1/133536 Reflective polarizers G02F1/13362 takes precedence
• CPC Class Codes: G02F 1/133638 Waveplates, i.e. plates with a retardation value of lambda/n
• CPC Class Codes: G09F 13/12 using a transparent mirror or other light reflecting surface transparent to transmitted light whereby a sign, symbol, picture or other is visible only when illuminated

Abstract

A mirror device (1) which can be simultaneously used for display purposes, based on e.g. an LCD display (5) with a polarizing mirror (2) placed in front of it. The polarizing mirror (2) has the characteristics that it does not disturb the transmission of the light from the display (5), but does reflect the light from outside the area of the screen.

Claims

1. A device for viewing reflected images and displayed images, comprising:

a polarizing mirror that reflects light of a first kind of polarization and passes light of a second kind of polarization, and is configured to provide the reflected images on a viewing side of the polarizing mirror in a first area of a surface of the device, and

a display device that is configured to provide light of the second kind of polarization from a non-viewing side to the viewing side of the polarizing mirror to selectively provide the displayed images in a second area, the second area being within the first area and significantly smaller than the first area.

2. The device of claim 1, including a switchable optical element between the display device and the viewing side of the polarizing mirror.

3. The device of claim 2, wherein the switchable optical element includes a switchable ½

λ

plate between the display device and the polarizing mirror.

4. The device of claim 3, including a further polarizing mirror between the display device and the switchable optical element.

5. The device of claim 2, wherein the viewing side of the polarizing mirror is provided with a switchable polarizer.

6. The device of claim 2, wherein the display device is provided with a reflecting layer at a side remote from the polarizing mirror.

7. The device of claim 2, wherein the polarizing mirror includes a linear polarization selective mirror.

8. The device of claim 1, wherein the display device emits or reflects light of the second kind of polarization.

9. The device of claim 1, wherein the first kind of polarization and the second kind of polarization have substantially perpendicular linear polarization directions.

10. The device of claim 1, wherein the first kind of polarization and the second kind of polarization are circular or elliptical polarizations of an opposite kind.

11. The device of claim 1, wherein the polarizing mirror includes a cholesteric mirror.

12. The device of claim 1, wherein the display device includes a reflecting layer at a side remote from the polarizing mirror.

13. The device of claim 1 in which the polarizing mirror and the display device are rotatable with respect to each other with respect to an axis substantially perpendicular to the first plane.

14. The device of claim 1 in which the polarizing mirror and the display device have a polarizer in common.

15. The device of claim 1 in which the display device belongs to the group of liquid crystal display devices and light emitting devices.

16. A device comprising:

a first polarizing mirror that reflects light of a first polarization toward a viewing side of the device and passes light of a second polarization,

a second polarizing mirror that reflects light of the second polarization toward the viewing side and passes light of the first polarization,

a switchable optical element situated between the first and second polarizing mirrors that is configured to selectively;

pass light of the second polarization in a first state, so that light of a second polarization from the first polarizing mirror is reflected from the second polarizing mirror, and

transform light of the first polarization from the second polarization mirror to light of the second polarization in a second state, so that light of the first polarization from a non-viewing side of the device is passed through the device to the viewing side, and

a display element that is situated on the non-viewing side of the device, and is configured to provide an image to be displayed via the light of the first polarization from the non-viewing side of the device.

17. The device of claim 16, wherein the light of the first polarization from the display element includes light of the first polarization from the second polarizing mirror that is reflected from the display element.