Mirror display, half mirror plate, and electronic device

Patent metadata

Field	Value
Publication number	US-2016178964-A1
Application number	US-201414909545-A
Country	US
Kind code	A1
Filing date	Jul 24, 2014
Priority date	Aug 5, 2013
Publication date	Jun 23, 2016
Grant date	—

Abstract

The present invention provides a mirror display that sufficiently prevents a decrease in the screen luminance in the display mode while sufficiently increasing the reflectance in the mirror mode, and also gives excellent production efficiency. The mirror display includes a half mirror plate including at least two half mirror layers; and a display device arranged on the backside of the half mirror plate, the display device including a polarizer, the at least two half mirror layers including at least one reflective polarizer, the transmission axis of the polarizer and the transmission axis of the at least one reflective polarizer being substantially parallel to each other or substantially perpendicular to each other, the mirror display configured to switch a display mode allowing display light to be emitted from the display device and to pass through the half mirror plate and a mirror mode preventing display light from being emitted from the display device, the mirror display exhibiting a sum of the transmittance in the display mode and the reflectance in the mirror mode of 100% or higher.

First claim

1 . A mirror display comprising:
a half mirror plate including at least two half mirror layers; and a display device arranged on the backside of the half mirror plate, the display device including a polarizer, the at least two half mirror layers including at least one reflective polarizer, the transmission axis of the polarizer and the transmission axis of the at least one reflective polarizer being substantially parallel to each other or substantially perpendicular to each other, the mirror display configured to switch a display mode allowing display light to be emitted from the display device and to pass through the half mirror plate and a mirror mode preventing display light from being emitted from the display device, the mirror display exhibiting a sum of the transmittance in the display mode and the reflectance in the mirror mode of 100% or higher.

2 . The mirror display according to claim 1 ,
wherein the at least one reflective polarizer includes first and second reflective polarizers, the half mirror plate includes, in the order from the display device side, the first reflective polarizer, a retarder, and the second reflective polarizer, and the transmission axis of the first reflective polarizer and the transmission axis of the second reflective polarizer being substantially parallel to each other.

3 . The mirror display according to claim 2 ,
wherein the retarder is a λ/2 plate.

4 . The mirror display according to claim 2 ,
wherein the retarder is a λ/4 plate.

5 . The mirror display according to claim 2 ,
wherein the retarder is a polyethylene terephthalate film.

6 . The mirror display according to claim 1 ,
wherein the half mirror plate further includes a depolarization layer between the at least two half mirror layers.

7 . The mirror display according to claim 6 ,
wherein the depolarization layer includes a diffusion adhesive layer.

8 . The mirror display according to claim 1 ,
wherein the at least one reflective polarizer includes a multi-layer reflective polarizer and a reflective polarizer utilizing selective reflection of cholesteric liquid crystal, and the half mirror plate includes, in the order from the display device side, the multi-layer reflective polarizer and the reflective polarizer utilizing selective reflection of cholesteric liquid crystal.

9 . The mirror display according to claim 1 ,
wherein the at least one reflective polarizer includes a multi-layer reflective polarizer, the at least two half mirror layers include a dielectric multi-layer film as well as the multi-layer reflective polarizer, and the half mirror plate includes, in the order from the display device side, the dielectric multi-layer film and the multi-layer reflective polarizer.

10 . The mirror display according to claim 1 ,
wherein the at least one reflective polarizer includes a multi-layer reflective polarizer, the at least two half mirror layers include a dielectric multi-layer film as well as the multi-layer reflective polarizer, and the half mirror plate includes, in the order from the display device side, the multi-layer reflective polarizer and the dielectric multi-layer film.

11 . The mirror display according to claim 1 ,
wherein the display device is a liquid crystal display device.

12 . The mirror display according to claim 11 ,
wherein the liquid crystal display device includes, in the order from the half mirror plate side, a first polarizer, a liquid crystal layer, and a second polarizer, and the transmission axis of the at least one reflective polarizer is substantially perpendicular to the transmission axis of the second polarizer and substantially parallel to the transmission axis of the first polarizer.

13 . A half mirror plate, comprising
at least two half mirror layers, the at least two half mirror layers including at least one reflective polarizer, the transmission axis of the at least one reflective polarizer being substantially parallel to or substantially perpendicular to the transmission axis of a polarizer included in a display device.

14 . An electronic device, comprising:
the mirror display according to claim 1 ; and a control device that controls a display region facing the display device by dividing the display region into multiple domains, the control device being configured to change the range and position of displaying an image by selecting a domain to display an image among the multiple domains.

15 . The electronic device according to claim 14 ,
wherein the range of displaying an image is changeable in response to pinch-in and pinch-out gestures.

Assignees

• Sharp Kk

Inventors

• Sakai Akira
• Hasegawa Masahiro
• Hakoi Hiroyuki
• Yoshida Hidefumi
• Mizushima Shigeaki

Classifications

• G06T11/10

  Texturing; Colouring; Generation of textures or colours (retouching, inpainting or scratch removal G06T5/77) · CPC title

• G02F2001/133557

  Physics · mapped topic

• G02B27/145

  having sequential partially reflecting surfaces · CPC title

• G02B27/286

  for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another (G02B5/3083 takes precedence; light guide coupling means utilising polarising elements G02B6/34) · CPC title

• G09G3/36

  using liquid crystals · CPC title