High color gamut quantum dot display

Patent metadata

Field	Value
Publication number	US-2016004124-A1
Application number	US-201414766689-A
Country	US
Kind code	A1
Filing date	Jan 28, 2014
Priority date	Feb 8, 2013
Publication date	Jan 7, 2016
Grant date	—

Abstract

An optical construction is described that includes a blue light source, a liquid crystal display panel, and a quantum dot film element optically between the blue light source and the liquid crystal display panel. In some embodiments, the blue light source can emit blue light that has a wavelength in a range from 440 to 460 nm and an FWHM of less than 25 nm. Also, in some embodiments, the quantum dot film element includes a plurality of quantum dots emitting a peak red wavelength in a range from 600 to 640 nm, an FWHM of less than 50 nm, a peak green wavelength in a range from 515 to 555 nm, and an FWHM of less than 40 nm. The quantum dot film element can be optically between the blue light source and the LCD panel.

First claim

1 . An optical construction comprising:
a blue light source emitting blue light having a wavelength in a range from 440 to 460 nm and an FWHM of less than 25 nm; a liquid crystal display (LCD) panel comprising a set of red, blue and green color filters; and a quantum dot film element comprising a plurality of quantum dots emitting a peak red wavelength in a range from 600 to 640 nm and an FWHM of less than 50 nm and a peak green wavelength in a range from 515 to 555 nm and an FWHM of less than 40 nm and being optically between the blue light source and the LCD panel.

2 . The optical construction of claim 1 , wherein:
the blue LED light source emits blue light having a wavelength in a range from 440 to 460 nm and an FWHM of less than 25 nm; the LCD panel has a native color gamut in a range from 35% to 45% NTSC; the quantum dot film element comprises a plurality of quantum dots emitting a peak red wavelength of in a range from 605 to 625 nm and an FWHM of less than 45 nm and a peak green wavelength in a range from 530 to 555 nm and an FWHM of less than 35 nm and being optically between the blue light source and the LCD panel; the optical construction achieves a color gamut of at least 50% NTSC.

3 . The optical construction of claim 1 , wherein:
the blue LED light source emits blue light having a wavelength in a range from 440 to 460 nm and an FWHM of less than 25 nm; the LCD panel has a native color gamut in a range from 45% to 55% NTSC; the quantum dot film element comprises a plurality of quantum dots emitting a peak red wavelength of in a range from 605 to 625 nm and an FWHM of less than 45 nm and a peak green wavelength in a range from 530 to 550 nm and an FWHM of less than 35 nm and being optically between the blue light source and the LCD panel; and the optical construction achieves a color gamut of at least 60% NTSC.

4 . The optical construction of claim 1 , wherein:
the blue LED light source emits blue light having a wavelength in a range from 440 to 460 nm and an FWHM of less than 25 nm; the LCD panel has a native color gamut in a range from 55% to 65% NTSC; the quantum dot film element comprises a plurality of quantum dots emitting a peak red wavelength of in a range from 605 to 625 nm and an FWHM of less than 45 nm and a peak green wavelength in a range from 530 to 550 nm and an FWHM of less than 35 nm and being optically between the blue light source and the LCD panel; the optical construction achieves a color gamut of at least 70% NTSC.

5 . The optical construction of claim 1 , wherein:
the blue LED light source emits blue light having a wavelength in a range from 440 to 460 nm and an FWHM of less than 25 nm; the LCD panel has a native color gamut in a range from 55% to 65% NTSC; the quantum dot film element comprises a plurality of quantum dots emitting a peak red wavelength of in a range from 615 to 635 nm and an FWHM of less than 45 nm and a peak green wavelength in a range from 520 to 540 nm and an FWHM of less than 35 nm and being optically between the blue light source and the LCD panel; and the optical construction achieves a color gamut of at least 80% NTSC.

6 . The optical construction of claim 1 , wherein:
the blue LED light source emits blue light having a wavelength in a range from 440 to 460 nm and an FWHM of less than 25 nm; the LCD panel has a native color gamut in a range from 65% to 75% NTSC; the quantum dot film element comprises a plurality of quantum dots emitting a peak red wavelength of in a range from 610 to 630 nm and an FWHM of less than 45 nm and a peak green wavelength in a range from 520 to 540 nm and an FWHM of less than 35 nm and being optically between the blue light source and the LCD panel; the optical construction achieves a color gamut of at least 80% NTSC.

7 . The optical construction of claim 1 , wherein:
the blue LED light source emits blue light having a wavelength in a range from 440 to 460 nm and an FWHM of less than 25 nm; the LCD panel has a native color gamut in a range from 75% to 85% NTSC; the quantum dot film element comprises a plurality of quantum dots emitting a peak red wavelength of in a range from 610 to 630 nm and an FWHM of less than 45 nm and a peak green wavelength in a range from 520 to 540 nm and an FWHM of less than 35 nm and being optically between the blue light source and the LCD panel; and the optical construction achieves a color gamut of at least 90% NTSC.

8 . The optical construction of claim 1 , wherein:
the blue LED light source emits blue light having a wavelength in a range from 440 to 460 nm and an FWHM of less than 25 nm; the LCD panel has a native color gamut in a range from 85% to 95% NTSC; the quantum dot film element comprises a plurality of quantum dots emitting a peak red wavelength of in a range from 610 to 630 nm and an FWHM of less than 45 nm and a peak green wavelength in a range from 520 to 540 nm and an FWHM of less than 35 nm and being optically between the blue light source and the LCD panel; and the optical construction achieves a color gamut of at least 100% NTSC.

9 . The optical construction according to claim 1 , further comprising a light recycling element optically between the quantum dot film element and the LCD panel.

10 . A method comprising:
choosing a target color gamut for an optical display; and assembling the optical display comprising:
a blue light source;
an LCD panel comprising a set of red, blue and green color filters and having a native color gamut being less than the target color gamut by at least 10%; and
a quantum dot film element comprising a plurality of quantum dots emitting a peak red wavelength having a red FWHM and a peak green wavelength having a green FWHM and being optically between the blue light source and the LCD panel; and
selecting the peak red wavelength and red FWHM and the peak green wavelength and green FWHM to achieve the target color gamut for the optical display.

11 . The method according to claim 10 , wherein selecting the peak red wavelength comprises selecting the peak red wavelength in a range from 600 to 640 nm and having an FWHM of less than 50 nm and the peak green wavelength in a range from 515 to 555 nm and having an FWHM of less than 40 nm.

12 . The method according to claim 10 , wherein selecting the peak red wavelength comprises selecting the peak red wavelength in a range from 600 to 640 nm and having an FWHM of less than 45 nm and the peak green wavelength in a range from 515 to 555 nm and having an FWHM of less than 35 nm.

13 . The method according to claim 10 , wherein selecting the peak red wavelength comprises selecting the peak red wavelength in a range from 605 to 635 nm and having an FWHM of less than 45 nm and the peak green wavelength in a range from 520 to 550 nm and having an FWHM of less than 35 nm.

14 . The method according to claim 10 , wherein the blue light source has a wavelength in a range from 440 to 460 nm and an FWHM of less than 25 nm.

15 . The method according to claim 14 , wherein the blue light source has a wavelength in a range from 440 to 460 nm and an FWHM of less than 20 nm.

16 . The method according to claim 10 , wherein assembling the optical display further comprises one or more light recycling elements between the quantum dot film element and the LCD panel.

Assignees

• 3M Innovative Properties Co

Inventors

• Benoit Gilles J
• Wheatley John A
• Thielen James A

Classifications

• G02F1/1336

  Illuminating devices · CPC title

• G02F1/133603 Primary

  with LEDs · CPC title

• G02F2202/108

  quantum wells · CPC title

• G02F2202/36

  Micro- or nanomaterials · CPC title

• G02F2/02

  Frequency-changing of light, e.g. by quantum counters · CPC title