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Electronic displays using optically pumped luminescent semiconductor nanocrystals

a luminescent semiconductor and optical pump technology, applied in the field of electronic displays, can solve the problems of unsurpassed crt image quality, resolution, color, volume, weight and power consumption, and display energy consumption, and achieve the effect of greater flexibility in using many more different colors

Inactive Publication Date: 2005-07-07
WEISS SHIMON +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention is a display that uses nanocrystals to produce different colors. The display can show many more colors than traditional displays, and the nanocrystals can be selected to produce different colors. The display includes a system for addressing the pixels, which can be a backlight source or a liquid crystal modulator. The nanocrystals can be excited with light of a single wavelength, and UV or blue light sources are preferred. The display can also have a long-pass filter to cover the pixel array. The technical effect of this invention is a more flexible and efficient display that can show a wider range of colors."

Problems solved by technology

CRT's main disadvantages are volume, weight and power consumption.
On the other hand, CRT's image quality, resolution, and color are still unsurpassed.
Since the backlight is unpolarized and its spectrum is broad, a considerable amount of light is dissipated on the sheet polarizers and color filters, making these displays energy inefficient.

Method used

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  • Electronic displays using optically pumped luminescent semiconductor nanocrystals
  • Electronic displays using optically pumped luminescent semiconductor nanocrystals
  • Electronic displays using optically pumped luminescent semiconductor nanocrystals

Examples

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Embodiment Construction

[0016] The invention comprises a color display which is based on the luminescence phenomena in semiconductor nanocrystals. It takes advantage of the following properties: (1) color tunability of the luminescence is obtained by quantum confinement through size control; (2) the luminescence of such nanocrystals is very narrow, i.e. spectrally pure; (3) the luminescence quantum efficiency of core-shell nanocrystals is very high; (4) the nanocrystals are photostable; (5) the absorption lineshape of the nanocrystals continues above an onset (which depends on particle size). Therefore, the luminescent semiconductor nanocrystals are capable of being excited over a broad bandwidth, yet exhibit emission in a narrow wavelength band. Thus, UV or blue light (UV / blue) as well as other color light may be used to excite different size nanocrystals with different emission spectra. For example, the same UV / blue light can be used to excite blue, red and green pixels to get the three needed primary RG...

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PUM

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Abstract

A multicolor electronic display is based on an array of luminescent semiconductor nanocrystals. Nanocrystals which emit light of different colors are grouped into pixels. The nanocrystals are optically pumped to produce a multicolor display. Different sized nanocrystals are used to produce the different colors. A variety of pixel addressing systems can be used.

Description

[0001] This invention was made with U.S. Government support under Contract No. DE-AC03-76SF0098 between the U.S. Department of Energy and the University of California for the operation of LAWRENCE BERKELEY NATIONAL LABORATORY (LBNL). The U.S. Government may have certain rights to this invention.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] This invention relates generally to electronic displays and more particularly to multi-color electronic displays based on luminescent semiconductor nanocrystals. [0004] 2. Description of the Related Art [0005] Flat panel display technologies are currently displacing cathode ray tube (CRT) displays. CRT's main disadvantages are volume, weight and power consumption. On the other hand, CRT's image quality, resolution, and color are still unsurpassed. An alternative technology, which has already made it to the market, is that of liquid crystal displays (LCDs). [0006] In liquid crystal displays, an image is produced by turning “on...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01J5/16H01J61/40
CPCB82Y20/00B82Y30/00G02F1/133617G02F1/133362H01L27/3211H01L51/5012H01L2251/5369G02F2202/36G02F1/1333G02F1/133509H10K59/35H10K50/11H10K2102/331G02B5/207G02F1/133528
Inventor WEISS, SHIMONSCHLAMP, MICHAEL C.ALIVISATOS, A. PAUL
Owner WEISS SHIMON