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Light Controlling Apparatus and Transparent Display Including the Same

一种光控制、设备的技术，应用在光学、非线性光学、仪器等方向，能够解决显示纯黑色困难、功耗高、透明性恶化等问题

Inactive Publication Date: 2016-02-03
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem with transparent display devices using LCD technology that their transparency is deteriorated by the polarizing plates used to achieve black
In addition, LCD-based transparent display devices also have problems with outdoor visibility
[0008] OLED-based transparent display devices have higher power consumption than LCD-based transparent display devices, and have difficulty displaying pure black
In addition, although OLED-based transparent display devices have no problem with contrast in dark environments, they suffer from contrast deterioration in general lighting environments

Method used

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  • Light Controlling Apparatus and Transparent Display Including the Same
  • Light Controlling Apparatus and Transparent Display Including the Same
  • Light Controlling Apparatus and Transparent Display Including the Same

Examples

Experimental program
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Effect test

Embodiment approach

[0078] A liquid crystal layer of a light control device using a guest-host liquid crystal layer for a transparent display device was investigated. In this case, the guest means the dichroic dye added to the liquid crystal, and the host means the liquid crystal. In the guest-host mode, the alignment direction of the liquid crystal is controlled by an electric field generated by an applied voltage, while aligning the dichroic dye in the same direction as the liquid crystal. Accordingly, incident light is scattered and absorbed by the liquid crystal and the dichroic dye, thereby realizing a light-shielding mode. If a voltage is applied, the liquid crystal and dichroic dye align perpendicular to the substrate, and all incident light passes through the guest-host liquid crystal, enabling a transparent (or transmissive) mode.

[0079] At this time, liquid crystals used as hosts can be classified into nematic liquid crystals, smectic liquid crystals, and cholesteric liquid crystals....

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Abstract

The invention discloses a light controlling apparatus and a transparent display including the same. The light controlling apparatus includes a first electrode on a first substrate; a first alignment film on the first electrode; a second electrode on a second substrate facing the first substrate; a second alignment film on the second electrode; and a guest-host liquid crystal layer having cholesteric liquid crystals and dichroic dyes between the first and second alignment films. The first and second electrodes provide a vertical electric field, and at least one of the first and second electrodes provides a horizontal electric field. The cholesteric liquid crystals have a homeotropic state when an electric field in a first direction is applied to the guest-host liquid crystal layer to realize a transparent mode. The cholesteric liquid crystals have a focal conic state when an electric field in a second direction is applied to realize a light shielding mode. The same state of the cholesteric liquid crystals and the dichroic dyes is maintained when no electric field is applied to the guest-host liquid crystal.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2014-0094885 filed on July 25, 2014 and No. 10-2015-0083150 filed on June 12, 2015, which are hereby incorporated by reference for all purposes It is incorporated herein as if fully set forth herein. technical field [0003] The present invention relates to a light control device and a transparent display device, in particular to a light control device and a transparent display device with a transparent mode and a light-shielding mode. Background technique [0004] Recently, with the development of the information age, display devices for processing and displaying a large amount of information have been developed. In particular, various display devices have come into view and attracted great attention. [0005] Examples of display devices include liquid crystal display (LCD) devices, plasma display panel (PDP) devices, field emission display (FED...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1343G02F1/137
CPCG02F1/134309G02F1/134363G02F1/13725G02F1/134381G02F1/133377G02F1/13718G02F2201/44G02F2203/01G02F1/13345G02F1/134372G02F1/13737G02F1/1337G02F1/13475G02F1/13394G02F1/1334G02F1/133742
Inventor 金纪汉安智煐李纹宣金溥凛池锡源
Owner LG DISPLAY CO LTD
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