Mirror display

• US 10,146,093 B2
• Filed: 02/15/2016
• Issued: 12/04/2018
• Est. Priority Date: 03/20/2015
• 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
• Primary Examiner(s): NGUYEN, THANH NHAN P
• Application Number:
  US15/559,820
• Publication Number:
  US 20180052346A1
• Time in Patent Office: 1,023 Days
• CPC Class Codes: G02F 1/133528 Polarisers
• 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 1/1347 Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
• CPC Class Codes: G02F 1/13471 in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells G02F1/13475 takes precedence
• CPC Class Codes: G02F 1/13478 based on selective reflection
• CPC Class Codes: G02F 1/13712 the liquid crystal having negative dielectric anisotropy
• CPC Class Codes: G02F 1/1393 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells G02F1/1396, G02F1/141 take precedence
• CPC Class Codes: G02F 2203/07 Polarisation dependent

Abstract

The present invention provides a mirror display that exhibits non-deteriorated display quality in a display mode and is capable of adjusting the color of reflected light in a mirror mode. The mirror display includes, in the following order from the back surface side: a display device including a polarizing plate; a reflective polarizing plate; a birefringence mode liquid crystal display panel; and an absorptive polarizing plate, the reflective polarizing plate including a transmission axis parallel to the transmission axis of the absorptive polarizing plate, the liquid crystal display panel being capable of switching, in transmission of incident polarized light, between a non-coloring mode of not altering the polarization state of the polarized light and a coloring mode of altering the polarization state of the polarized light, the liquid crystal display panel selecting the coloring mode when the display device is in a non-display state, the liquid crystal display panel in the coloring mode increasing a retardation to a value greater than 275 nm in measurement with light having a wavelength of 550 nm.

Claims

1. A mirror display comprising, in the following order from the back surface side:

a display device including a polarizing plate;

a reflective polarizing plate;

a birefringence mode liquid crystal display panel; and

an absorptive polarizing plate,

the reflective polarizing plate including a transmission axis parallel to the transmission axis of the absorptive polarizing plate,

the liquid crystal display panel being capable of switching, in transmission of incident polarized light, between a non-coloring mode of not altering the polarization state of the polarized light and a coloring mode of altering the polarization state of the polarized light,

the liquid crystal display panel selecting the coloring mode when the display device is in a non-display state,

the liquid crystal display panel in the coloring mode increasing a retardation to a value greater than 275 nm in measurement with light having a wavelength of 550 nm.

2. The mirror display according to claim 1,

wherein the liquid crystal display panel aligns liquid crystal molecules having negative anisotropy of dielectric constant perpendicularly to a substrate surface when no voltage is applied.

3. The mirror display according to claim 2,

wherein the liquid crystal display panel has a liquid crystal retardation of greater than 343 nm in measurement with light having a wavelength of 550 nm.

4. The mirror display according to claim 1,

wherein the display device is a liquid crystal display device.