NVIS color filter and a liquid crystal display device including the same

• US 9,927,562 B2
• Filed: 05/28/2015
• Issued: 03/27/2018
• Est. Priority Date: 05/30/2014
• Status: Active Grant

• Current Assignee: Cevians LLC
• Original Assignee: Cevians LLC
• Inventors: Lemay, Eric, Krylova, Valentina, Phipps, Benjamin George
• Primary Examiner(s): Ngo, Huyen
• Application Number:
  US14/724,646
• Publication Number:
  US 20150369978A1
• Time in Patent Office: 1,034 Days
• CPC Class Codes: G02B 5/208 for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 2201/08 light absorbing layer
• CPC Class Codes: G02F 2201/083 infrared absorbing
• CPC Class Codes: G02F 2203/055 wavelength filtering
• CPC Class Codes: G02F 2203/11 involving infrared radiation
• CPC Class Codes: H04N 3/09 for electromagnetic radiation in the invisible region, e.g. infrared

Abstract

A night vision imaging system (NVIS) compatible liquid crystal display (LCD) includes a backlight and an LCD panel. The LCD panel includes a color filter including a plurality of colored pixels. Each of the colored pixels in the plurality of colored pixels incorporates a near infrared (NIR) filter, capable of substantially blocking emissions from the backlight, including NIR emission between 650 nm and 930 nm, while maintaining high transmission of bands of visible light for producing a full color visual image.

Claims

1. A night vision imaging system (NVIS) compatible liquid crystal display (LCD) comprising:

a backlight; and

an LCD panel, the LCD panel comprising

a color filter comprising a plurality of colored pixels, each of said colored pixels in said plurality of colored pixels comprising;

binder resin;

a visible absorber having an absorption maximum at a wavelength within a range from 400 nm to 700 nm; and

a near infrared (NIR) absorber having an absorption maximum at a wavelength within a range from 650 nm to 930 nm;

wherein each of said colored pixels in said plurality of colored pixels is configured to transmit a band of visible light and substantially block NIR radiation received from said backlight.

2. The NVIS compatible LCD of claim 1, wherein the color filter blocks over 80% of incident radiation having wavelength ranging from approximately 650 nm to 930 nm.

3. The NVIS compatible LCD of claim 1, wherein the color filter provides NVIS filtering compliance to MIL-STD-3009 without supplemental filtering.

4. The NVIS compatible LCD of claim 1, wherein the colored pixels comprise red, green and blue colored pixels.

5. The NVIS compatible LCD of claim 4, wherein said blue colored pixel is configured to transmit a band of visible light from approximately 430 nm to approximately 480 nm, said green colored pixel is configured to transmit a band of visible light from approximately 490 nm to approximately 560 nm, and said red colored pixel is configured to transmit a band of visible light from approximately 600 nm to approximately 650 nm.

6. The NVIS compatible LCD of claim 1, wherein the visible absorber comprises a pigment or dye, dispersed in the binder resin.

7. The NVIS compatible LCD of claim 1, wherein the NIR absorber comprises a pigment or dye, dispersed in the binder resin.

8. The NVIS compatible LCD of claim 1, wherein the NIR absorber is different for the red, green and blue colored pixels such that the respective NIR absorber has differently shaped absorption spectra for the red, green and blue colored pixels.

9. The NVIS compatible LCD of claim 1, wherein said colored pixels further comprise at least one color balancing dye.

10. The NVIS compatible LCD of claim 1, wherein the binder resin comprises a photosensitive resin comprising a photo polymerizable monomer and a polymerization initiator.

11. The NVIS compatible LCD of claim 1, wherein the binder resin comprises an acrylic resin.