DISPLAYS

• US 20190243185A1
• Filed: 01/10/2019
• Published: 08/08/2019
• Est. Priority Date: 02/05/2018
• Status: Active Grant

• Current Assignee: Radiant Choice Limited
• Original Assignee: Radiant Choice Limited
• Inventors: Tran, Nguyen The, You, Jiun-Pyng
• Granted Patent: US 10,642,091 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/1336 Illuminating devices
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/133624 characterised by their spectral emissions
• CPC Class Codes: G02F 2202/36 Micro- or nanomaterials
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/502 Wavelength conversion materials

Abstract

Aspects of the invention include a display device including a liquid crystal display (LCD) panel comprising a plurality of blue color filters, a plurality of green color filters, and a plurality of red color filters; and a light source configured to provide light to the LCD panel. The light has a spectrum with a blue component, a green component and a red component. In one embodiment, the blue component has at least one peak wavelength in between 465 nm to 495 nm. In another embodiment, the blue component has an intensity being broadly distributed over a wavelength range of 430 nm to 495 nm. The plurality of green color filters has a transmission cut off wavelength being 480 nm or greater than 480 nm. The plurality of blue color filters has a transmission cut off wavelength being no greater than 500 nm.

Claims

1. A display device, comprising:

a liquid crystal display (LCD) panel comprising a plurality of blue color filters, a plurality of green color filters, and a plurality of red color filters; and

a light source configured to provide light to the LCD panel, wherein the light has a spectrum with a blue component, a green component and a red component;

wherein the blue component has at least one peak wavelength in between 465 nm to 495 nm.

2. The display device of claim 1, wherein the blue component has intensity of a peak at a longer wavelength being higher than that at a shorter wavelength.

3. The display device of claim 1, wherein

the light source comprises at least one of blue LED chips, blue LD chips, and blue OLED chips for emitting the blue component;

or

the light source comprises at least one of blue LED chips, blue LD chips, and blue OLED chips for emitting the blue component, and of green LED chips, green LD chips, and green OLED chips for emitting the green component.

4. The display device of claim 3, wherein the light source further comprises

green and red wavelength conversion materials for emitting the green component and the red component when excited by the blue component;

or

red wavelength conversion materials for emitting the red component when excited by the blue component and/or the green component.

5. The display device of claim 4, wherein the wavelength conversion materials comprises at least one of phosphor materials, quantum dot materials, dye materials.

6. The display device of claim 1, wherein the light source is a backlight unit.

7. The display device of claim 1, wherein the plurality of green color filters has a transmission cut off wavelength being 480 nm or greater than 480 nm.

8. The display device of claim 1, wherein the plurality of blue color filters has a transmission cut off wavelength being no greater than 500 nm.

9. A display device, comprising:

a liquid crystal display (LCD) panel comprising a plurality of blue color filters, a plurality of green color filters, and a plurality of red color filters; and

a light source configured to provide light to the LCD panel, wherein the light has a spectrum with a blue component, a green component and a red component;

wherein the blue component has an intensity being broadly distributed over a wavelength range of 430 nm to 495 nm.

10. The display device of claim 9, wherein the blue component has a peak ranging from 470 nm to 490 nm.

11. The display device of claim 9, wherein

the light source comprises at least one of blue LED chips, blue LD chips, and blue OLED chips for emitting the blue component;

or

the light source comprises at least one of blue LED chips, blue LD chips, and blue OLED chips for emitting the blue component, and of green LED chips, green LD chips, and green OLED chips for emitting the green component.

12. The display device of claim 11, wherein the light source further comprises

green and red wavelength conversion materials for emitting the green component and the red component when excited by the blue component;

or

red wavelength conversion materials for emitting the red component when excited by the blue component and/or the green component.

13. The display device of claim 12, wherein the wavelength conversion materials comprises at least one of phosphor materials, quantum dot materials, dye materials.

14. The display device of claim 9, wherein the light source is a backlight unit.

15. The display device of claim 9, wherein the plurality of green color filters has a transmission cut off wavelength being 480 nm or greater than 480 nm.

16. The display device of claim 9, wherein the plurality of blue color filters has a transmission cut off wavelength being no greater than 500 nm.

17. A light source for provide light having a spectrum with a blue component, a green component and a red component, for a display device, comprising:

at least one of blue LED chips, blue LD chips, and blue OLED chips for emitting the blue component; and

green and red wavelength conversion materials for emitting the green component and the red component when excited by the blue component;

wherein the blue component has at least one peak wavelength in between 465 nm to 495 nm, and intensity of a peak at a longer wavelength being higher than that at a shorter wavelength;

or

wherein the blue component has an intensity being broadly distributed over a wavelength range of 430 nm to 495 nm, and a peak ranging from 470 nm to 490 nm.

18. The light source of claim 17, wherein the wavelength conversion materials comprises at least one of phosphor materials, quantum dot materials, dye materials.

19. A light source for provide light having a spectrum with a blue component, a green component and a red component, for a display device, comprising:

at least one of blue LED chips, blue LD chips, and blue OLED chips for emitting the blue component, and of green LED chips, green LD chips, and green OLED chips for emitting the green component; and

red wavelength conversion materials for emitting the red component when excited by the blue component and the blue component;

wherein the blue component has at least one peak wavelength in between 465 nm to 495 nm, and intensity of a peak at a longer wavelength being higher than that at a shorter wavelength;

or

wherein the blue component has an intensity being broadly distributed over a wavelength range of 430 nm to 495 nm, and a peak ranging from 470 nm to 490 nm.

20. The light source of claim 19, wherein the wavelength conversion materials comprises at least one of phosphor materials, quantum dot materials, dye materials.