MIRROR DISPLAY

• US 20170329169A1
• Filed: 10/22/2015
• Published: 11/16/2017
• Est. Priority Date: 10/28/2014
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: SAKAI, Akira, HAKOI, Hiroyuki, HASEGAWA, Masahiro, MINOURA, Kiyoshi
• Granted Patent: US 10,234,727 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/133531 characterised by the arrangement of polariser or analyser axes
• CPC Class Codes: G02F 1/133536 Reflective polarizers G02F1/13362 takes precedence
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 1/133638 Waveplates, i.e. plates with a retardation value of lambda/n
• CPC Class Codes: G02F 2203/64 Normally black display, i.e. the off state being black
• CPC Class Codes: G02F 2413/03 Number of plates being 3
• CPC Class Codes: G02F 2413/07 All plates on one side of the LC cell
• CPC Class Codes: G02F 2413/08 with a particular optical axis orientation

Abstract

The present invention provides a mirror display that can be enlarged without quality deterioration. The mirror display includes, in the order from a viewing surface side, a half mirror plate including a reflective polarizer, a polarization conversion layer, and a display device including an absorptive polarizer on a side of the polarization conversion layer. The reflective polarizer includes a transmission axis parallel to the longitudinal direction of the display device and is jointless. The absorptive polarizer includes a transmission axis perpendicular to the longitudinal direction of the display device and is jointless. The polarization conversion layer is configured to convert the polarization of polarized light passed through the absorptive polarizer.

Claims

1. A mirror display comprising:

in the order from a viewing surface side,

a half mirror plate including a reflective polarizer;

a polarization conversion layer; and

a display device including an absorptive polarizer on a side of the polarization conversion layer,

the reflective polarizer including a transmission axis parallel to the longitudinal direction of the display device and being jointless,

the absorptive polarizer including a transmission axis perpendicular to the longitudinal direction of the display device and being jointless,

the polarization conversion layer being configured to convert the polarization of polarized light passed through the absorptive polarizer.

2. The mirror display according to claim 1,

wherein the polarization conversion layer is configured to rotate the azimuth of polarized light passed through the absorptive polarizer by 90°

.

3. The mirror display according to claim 1,

wherein the polarization conversion layer includes a retarder.

4. The mirror display according to claim 3,

wherein the retarder includes a λ

/2 plate.

5. The mirror display according to claim 3,

wherein the retarder includes a λ

/4 plate.

6. The mirror display according to claim 1,

wherein the polarization conversion layer includes a polarization rotator.

7. The mirror display according to claim 1,

wherein the polarization conversion layer is integrated with the half mirror plate.

8. The mirror display according to claim 1,

wherein the polarization conversion layer is integrated with the display device.

9. The mirror display according to claim 1,

wherein the polarization conversion layer is jointless.

10. The mirror display according to claim 1,

wherein the display device is a liquid crystal display device.