# US 10,372,011 B2 · Electronically controlled light valve and display apparatus having high transmittance and high reflectivity

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- Number: US 10,372,011 B2
- Document ID: US10372011B2
- Status: Granted
- Kind: B2
- Application number: 15/933,385
- Filed: 2018-03-23
- Published: 2019-07-04
- Granted: 2019-08-06
- Earliest claimed: 2017-12-29
- Assignees: Chunghwa Picture Tubes, Ltd.
- Applicants: Chunghwa Picture Tubes, LTD.
- Inventors: Wen-Jiunn Hsieh; Cheng-Min Liao; Wen-Tse Tseng
- Web page: https://patentgrep.com/patent/US10372011B2

## CPC

- G02F 1/172: {based on a suspension of orientable dipolar particles, e.g. suspended particles displays}
- F21V 14/003: {by interposition of elements with electrically controlled variable light transmissivity, e.g. liquid crystal elements or electrochromic devices}
- G02B 26/004: {based on a displacement or a deformation of a fluid}
- G02B 26/005: {based on electrowetting}
- G02B 26/0816: {by means of one or more reflecting elements}
- G02F 1/133348: {Charged particles addressed liquid crystal cells, e.g. controlled by an electron beam}
- G02F 1/1334: based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
- G02F 1/133536: {Reflective polarizers (G02F1/13362 takes precedence)}
- G02F 1/133553: {Reflecting elements (associated to illuminating devices G02F1/133605)}
- G02F 1/133555: {Transflectors}
- G02F 1/167: by electrophoresis
- H04N 5/7441: {the modulator being an array of liquid crystal cells}
- G02F 1/133562: {on the viewer side}
- G02F 1/13478: {based on selective reflection}
- G02F 1/1352: {Light-reflecting layers}
- G02F 1/19: based on variable-reflection or variable-refraction elements not provided for in groups G02F1/015 - G02F1/169
- G02F 2001/1678: {characterised by the composition or particle type}
- G02F 2201/44: Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
- G02F 2203/02: reflective
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

Provided are a display apparatus and an electrically controlled light valve including a first substrate, a second substrate disposed opposite to the first substrate, a first transparent conductive layer disposed on the first substrate, a second transparent conductive layer disposed on the second substrate, a first liquid layer disposed between the first and the second transparent conductive layers, a second liquid layer disposed between the first and the second transparent conductive layers and reflective particles. The first and the second liquid layers are respectively adjacent to the first and the second transparent conductive layers. The first liquid layer includes a polar liquid. The second liquid layer includes a non-polar liquid. Each reflective particle has a conductive body and a surface modification layer covering the conductive body. When the electrically controlled light valve is switched to a light-transmission mode, the reflective particles are evenly dispersed in the first liquid layer.

## Claims

### Claim 1

An electrically controlled light valve, adapted to be switched to a reflection mode or a light-transmission mode, comprising:
a first substrate;
a second substrate, disposed opposite to the first substrate;
a first transparent conductive layer, disposed on the first substrate;
a second transparent conductive layer, disposed on the second substrate;
a first liquid layer, disposed between the first transparent conductive layer and the second transparent conductive layer and adjacent to the first transparent conductive layer, wherein the first liquid layer comprises a polar liquid, water, and sodium chloride (NaCl) mixed in the water;
a second liquid layer, disposed between the first transparent conductive layer and the second transparent conductive layer and adjacent to the second transparent conductive layer, wherein the second liquid layer comprises a non-polar liquid; and
a plurality of reflective particles, each of the reflective particles having a conductive body and a surface modification layer, wherein the surface modification layer has a uniform property throughout the surface modification layer and the conductive body is at least partially surrounded by the surface modification layer,
wherein when the electrically controlled light valve is switched to the light-transmission mode, the reflective particles are evenly dispersed in the first liquid layer, and
when the electrically controlled light valve is switched to the reflection mode, the reflective particles are accumulated on an interface between the first liquid layer and the second liquid layer.

### Claim 2 (depends on 1)

The electrically controlled light valve according to claim 1, wherein the second liquid layer comprises 1,2-dichloroethane.

### Claim 3 (depends on 2)

The electrically controlled light valve according to claim 2, wherein the second liquid layer further comprises:
tetrabutylammonium tetraphenylborate (TBATPB), mixed in the 1,2-dichloroethane.

### Claim 4 (depends on 1)

The electrically controlled light valve according to claim 1, wherein the conductive body comprises gold, silver, platinum or an alloy containing gold, silver or platinum.

### Claim 5 (depends on 1)

The electrically controlled light valve according to claim 1, wherein the surface modification layer comprises a 12-mercaptododecanoic acid.

### Claim 6 (depends on 1)

The electrically controlled light valve according to claim 1, wherein a concentration of each of the reflective particles in the first liquid layer ranges from 1012 particles/cm3 to 1014 particles/cm3, and a diameter of each of the reflective particles ranges from 5 nm to 100 nm.

### Claim 7

A display apparatus, comprising:
a display panel, adapted to emit a display light beam; and
an electrically controlled light valve, disposed on a transmission path of the display light beam, adapted to be switched to a reflection mode or a light-transmission mode and comprising:
a first substrate;
a second substrate, disposed opposite to the first substrate;
a first transparent conductive layer, disposed on the first substrate;
a second transparent conductive layer, disposed on the second substrate;
a first liquid layer, disposed between the first transparent conductive layer and the second transparent conductive layer and adjacent to the first transparent conductive layer, wherein the first liquid layer comprises a polar liquid, water, and sodium chloride (NaCl) mixed in the water;
a second liquid layer, disposed between the first transparent conductive layer and the second transparent conductive layer and adjacent to the second transparent conductive layer, wherein the second liquid layer comprises a non-polar liquid; and
a plurality of reflective particles, each of the reflective particles having a conductive body and a surface modification layer, wherein the surface modification layer has a uniform property throughout the surface modification layer and the conductive body is at least partially surrounded by the surface modification layer,
wherein when the electrically controlled light valve is switched to the light-transmission mode, the reflective particles are evenly dispersed in the first liquid layer, and
when the electrically controlled light valve is switched to the reflection mode, the reflective particles are accumulated on an interface between the first liquid layer and the second liquid layer.

### Claim 8 (depends on 7)

The display apparatus according to claim 7, wherein the second liquid layer comprises 1,2-dichloroethane.

### Claim 9 (depends on 8)

The display apparatus according to claim 8, wherein the second liquid layer further comprises:
tetrabutylammonium tetraphenylborate (TBATPB), mixed in the 1,2-dichloroethane.

### Claim 10 (depends on 7)

The display apparatus according to claim 7, wherein the conductive body comprises gold, silver, platinum or an alloy containing gold, silver or platinum.

### Claim 11 (depends on 7)

The display apparatus according to claim 7, wherein the surface modification layer comprises a 12-mercaptododecanoic acid.

### Claim 12 (depends on 7)

The display apparatus according to claim 7, wherein a concentration of each of the reflective particles in the first liquid layer ranges from 1012 particles/cm3 to 1014 particles/cm3, and a diameter of each of the reflective particles ranges from 5 nm to 100 nm.