# US 2013/0278987 A1 · Reflective display utilizing luminescence

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- Number: US 2013/0278987 A1
- Document ID: US20130278987A1
- Status: Published application
- Kind: A1
- Application number: 13/996,510
- Filed: 2010-12-20
- Published: 2013-10-24
- Earliest claimed: 2010-12-20
- Assignees: Hewlett-Packard Development Company, L.P.
- Inventors: Xia Sheng; Gary Gibson; Dick Henze; Zhang-Lin Zhou
- Web page: https://patentgrep.com/patent/US20130278987A1

## CPC

- G02F 1/133514: {Colour filters}
- G02B 17/00: Systems with reflecting surfaces, with or without refracting elements
- G02B 26/02: for controlling the intensity of light {(G02B26/004 takes precedence)}
- G02F 1/133553: {Reflecting elements (associated to illuminating devices G02F1/133605)}
- G02F 1/167: by electrophoresis
- 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
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A reflective color display pixel has a top surface for receiving ambient light, and a plurality of sub-pixels including a first sub-pixel. The first sub-pixel has a broadband mirror and a luminescent layer disposed over the broadband mirror. The luminescent layer contains a luminescent material for absorbing a portion of the ambient light and emitting light of a first color, and a light-absorbing material for absorbing light of wavelengths longer than a wavelength of the first color.

## Claims

### Claim 1

A reflective color display pixel comprising:
a top surface for receiving ambient light; and
a plurality of sub-pixels including a first sub-pixel, the first sub-pixel having a broadband mirror and a luminescent layer disposed over the broadband mirror, the luminescent layer containing a luminescent material for absorbing a portion of the ambient light and emitting light of a first color, and a light-absorbing material for absorbing light of wavelengths longer than a wavelength of the first color.

### Claim 2 (depends on 1)

A reflective color display pixel as in claim 1, wherein the first sub-pixel includes an electro-optic shutter disposed over the luminescent layer.

### Claim 3 (depends on 2)

A reflective color display pixel as in claim 2, wherein the first color is selected from the group of green and blue.

### Claim 4 (depends on 1)

A reflective color display pixel as in claim 1, wherein the luminescent material includes luminophores each comprising a series of organic relay dyes.

### Claim 5 (depends on 1)

A reflective color display pixel as in claim 1, wherein the light-absorbing material includes light-absorbing particles.

### Claim 6 (depends on 5)

A reflective color display pixel as in claim 5, wherein the light-absorbing particles have a diameter in the range of 50-200 nm.

### Claim 7 (depends on 6)

A reflective color display pixel as in claim 6, wherein the each of the light-absorbing particles is coated with a shell of optically non-absorbing material.

### Claim 8

A reflective color display comprising:
a plurality of pixels, each pixel having a top surface for receiving ambient light and at least a first sub-pixel for generating a first color, a second sub-pixel for generating a second color, and a third sub-pixel for generating a third color, the first sub-pixel having a broadband mirror and a luminescent layer disposed over the broadband mirror, the luminescent layer of the first sub-pixel containing a luminescent material for absorbing a portion of the ambient light and emitting light of the first color, and a light-absorbing material for absorbing light of wavelengths longer than a wavelength of the first color.

### Claim 9 (depends on 8)

A reflective color display as in claim 8, further including a white sub-pixel.

### Claim 10 (depends on 8)

A reflective color display as in claim 8, wherein the first color is green and the second color is red, and the second sub-pixel has a broadband mirror and a luminescent layer disposed over the broadband mirror and containing luminophores for absorbing a portion of the ambient light and emitting light in a red band.

### Claim 11 (depends on 10)

A reflective color display as in claim 10, wherein the third color is blue, and the third sub-pixel has a broadband mirror and a filter layer disposed over the broadband mirror, the filter layer containing a light-absorbing material for absorbing wavelengths longer than a blue wavelength.

### Claim 12 (depends on 11)

A reflective color display as in claim 11, wherein the filter layer of the third sub-pixel further contains a luminescent material for absorbing a portion of the ambient light and emitting in a blue band.

### Claim 13 (depends on 8)

A reflective color display as in claim 8, wherein the light-absorbing material of the first sub-pixel includes light-absorbing particles.

### Claim 14 (depends on 13)

A reflective color display as in claim 13, wherein the light absorbing particles have a diameter between 50 nm and 200 nm.

### Claim 15 (depends on 14)

A reflective color display as in claim 14, wherein each of the light-absorbing particles is coated with a shell of optically non-absorbing material having a thickness of from 2 nm to 20 nm.