Mirror with built-in display

• US 7,728,927 B2
• Filed: 08/20/2004
• Issued: 06/01/2010
• Est. Priority Date: 09/09/2003
• 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: Nieuwkerk, Armanda Cinderella, Van Deurzen, Maria Henrica Wilhelmina Antonia, Van Delden, Martinus Hermanus Wilhelmus Maria
• Primary Examiner(s): Font; Frank G
• Assistant Examiner(s): Wong; Eric
• Application Number:
  US10/570,445
• Publication Number:
  US 20070058109A1
• Time in Patent Office: 2,111 Days
• Field of Search: 349/93, 349/113
• US Class Current: 349/96
• CPC Class Codes: A47G 1/02 Mirrors used as equipment hand, pocket, or shaving mirrors A45D42/00; optical viewing means for vehicles B60R1/00
• CPC Class Codes: G02B 5/3016 involving passive liquid crystal elements optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528
• CPC Class Codes: G02F 1/133536 Reflective polarizers G02F1/13362 takes precedence
• CPC Class Codes: G02F 1/133562 on the viewer side
• CPC Class Codes: G02F 1/133753 with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle

Abstract

A mirror device may be simultaneously used for display purposes, based on e.g. an LCD display with a polarizing mirror placed in front of it. The polarizing mirror has the characteristics that it does not disturb the transmission of the light from the display to the viewer, but does reflect the incident light.

Claims

1. A polarizing mirror for viewing purposes having a first plane reflecting light of a first kind of polarization to a viewing side, the mirror passing light of a second kind of polarization and being provided with a display device at its non-viewing side, which display device during use provides light of the second kind of polarization, the polarizing mirror at its viewing side having a polarizing device being switchable between two optical states, the polarizing device comprising a liquid crystal layer between two substrates, wherein the polarizing device is adapted to orient liquid crystal molecules during one of the optical states in at least two orientation directions.

2. The polarizing mirror as claimed in claim 1 in which a portion of at least one substrate has a plurality of domains having different orientation directions for each area related to a picture element of the display device.

3. The polarizing mirror as claimed in claim 1 in which the liquid crystal layer between the two substrates comprises a dye.

4. The polarizing mirror as claimed in claim 1 in which the polarizing device comprises a patterned ½

λ

retarder and a polarizer.

5. An apparatus having a viewing side and a non-viewing side, the apparatus comprising:

a polarizing device switchable between two optical states wherein the polarizing device is configured for receiving incident light from the viewing surface and reflecting a portion of the incident light in a mirror mode so that the apparatus comprises a mirror; and

a display device at the non-viewing side, the polarizing device being configured for passing light from the display device when in use so that the apparatus comprises a mirror portion and a display portion, the mirror portion reflecting the portion of the incident light and the display portion providing images from the display device;

wherein the polarizing device comprises a liquid crystal layer between two substrates, the liquid crystal display layer comprising liquid crystal molecules being orientated during one of the two optical states in at least two orientation directions.

6. The apparatus of claim 5, wherein a portion of at least one substrate has a plurality of domains having different orientation directions for each area related to a picture element of the display device.

7. The apparatus of claim 5, wherein the liquid crystal layer between the two substrates comprises a dye.

8. The apparatus of claim 5, wherein the polarizing device comprises a patterned ½

λ

retarder and a polarizer.

9. An apparatus having a viewing side and a non-viewing side, the apparatus comprising:

a surface having viewing side and a non-viewing side;

a display device along the non-viewing side; and

a polarizing device between the surface and the display device, the polarizing device being switchable between two optical states so that the viewing side comprises a mirror in a first mode and comprises a combination of a mirror portion and a display portion in a second mode;

the mirror portion reflecting a portion of light incident on the surface from the viewing side, and the display portion passing images from the display device;

wherein the polarizing device comprises a liquid crystal layer between two substrates, the liquid crystal display layer comprising liquid crystal molecules being orientated during one of the two optical states in at least two orientation directions so that two viewers located at different areas in front of the viewing side see the images passed from the display device in the second mode.

10. The apparatus of claim 9, wherein a portion of at least one substrate has a plurality of domains having different orientation directions for each area related to a picture element of the display device.

11. The apparatus of claim 9, wherein the liquid crystal layer between the two substrates comprises a dye.

12. The apparatus of claim 9, wherein the polarizing device comprises a patterned ½

λ

retarder and a polarizer.

13. The apparatus of claim 9, wherein the polarizing device is configured to attenuate undesired reflections in the second mode.