Liquid crystal display device including boundary fluorescent body

Patent metadata

Field	Value
Publication number	US-2016377786-A1
Application number	US-201514880627-A
Country	US
Kind code	A1
Filing date	Oct 12, 2015
Priority date	Jun 24, 2015
Publication date	Dec 29, 2016
Grant date	—

Abstract

A liquid crystal display device including a backlight unit and a fluorescent film, and a boundary fluorescent body is described.

First claim

1 . A liquid crystal display (LCD) device comprising:
a light guide plate projecting light emitted from a light source; a fluorescent film comprising quantum dots of at least one size, the fluorescent film comprising an outer edge; a boundary fluorescent body formed in a quadrangle frame that overlaps the outer edge of the fluorescent film, the boundary fluorescent film comprising quantum dots of the at least one size; and a LCD display panel that realizes an image using light emitted by the light guide plate, the fluorescent film, and the boundary fluorescent body.

2 . The liquid crystal display (LCD) of claim 1 wherein the quadrangle frame of the boundary fluorescent body is shaped as an inner and an outer quadrilateral with a second fluorescent film disposed between the quadrilaterals, the second fluorescent film comprising the quantum dots of the boundary fluorescent body.

3 . The liquid crystal display (LCD) of claim 2 wherein a space between edges of the inner quadrilateral is vacant of quantum dots.

4 . The liquid crystal display (LCD) of claim 1 wherein the quantum dots of the boundary fluorescent body overlap the outer edge of the fluorescent film.

5 . The liquid crystal display (LCD) of claim 1 wherein light transmitted by the fluorescent film and light converted by the quantum dots of the fluorescent film combine to form white light away from the outer edge of the fluorescent film.

6 . The liquid crystal display (LCD) of claim 1 wherein light transmitted by the boundary fluorescent body and light converted by the quantum dots of the boundary fluorescent film combine to form white light near the outer edge of the fluorescent film.

7 . The liquid crystal display (LCD) of claim 1 wherein the size of the quantum dots used in both the fluorescent film and the boundary fluorescent film are chosen to produce at least one wavelength of least one of red, green, and blue light that is not emitted by the light source.

8 . The liquid crystal display (LCD) of claim 1 wherein the light source emits green light and blue light; wherein the fluorescent film and the boundary fluorescent body both comprise quantum dots that absorb at least some of the green and the blue light and emit red light; and wherein the green and the blue light not absorbed by the quantum dots of the fluorescent film and the boundary fluorescent body combine with the red light emitted by the fluorescent film and the boundary fluorescent film to form white light incident on the LCD display panel.

9 . The liquid crystal display (LCD) of claim 1 wherein the light source emits blue light; wherein the fluorescent film and the boundary fluorescent body both comprise quantum dots that absorb at least some of the blue light and emit red and green light; and wherein the blue light not absorbed by the quantum dots of the fluorescent film and the boundary fluorescent body combines with the red and the green light emitted by the fluorescent film and the boundary fluorescent film to form white light incident on the LCD display panel.

10 . The liquid crystal display (LCD) of claim 1 wherein the light source emits ultraviolet light; wherein the fluorescent film and the boundary fluorescent body both comprise quantum dots that absorb at least some of the ultraviolet light and emit red, green, and blue light; and wherein the red, the green, and the blue light emitted by the fluorescent film and the boundary fluorescent film combine to form white light incident on the LCD display panel.

11 . The liquid crystal display (LCD) of claim 1 wherein the boundary fluorescent body is located between the LCD display panel and the fluorescent film.

12 . The liquid crystal display (LCD) of claim 1 further comprising:
a diffusion sheet between the display panel and the fluorescent film; and
wherein the boundary fluorescent body is located between the LCD display panel and the diffusion sheet.

13 . The liquid crystal display (LCD) of claim 1 further comprising:
a diffusion sheet located between the display panel and the fluorescent film;
a prism sheet located between the diffusion sheet and the fluorescent film; and
wherein the boundary fluorescent body is located between the diffusion sheet and the prism sheet.

14 . The liquid crystal display (LCD) of claim 1 further comprising:
a reflective sheet located beneath the light guide plate; and
wherein the boundary fluorescent film is located between the reflective sheet and the light guide plate.

15 . The liquid crystal display (LCD) of claim 1 wherein the boundary fluorescent film is located between the light guide plate and the fluorescent film.

16 . The liquid crystal display (LCD) of claim 1 wherein at least one of the fluorescent film and the boundary fluorescent body comprises:
an upper barrier;
a lower barrier; and
a quantum dot layer disposed between the upper and the lower barriers, the quantum dot layer.

17 . The liquid crystal display (LCD) of claim 1 wherein the LCD display panel comprises:
an upper and a lower substrate;
a liquid crystal layer located between the upper and the lower substrate; and
a plurality of polarizing plates, one of the polarizing plates attached below the upper substrate, another of the polarizing plates attached above the lower substrate.

Assignees

• Lg Display Co Ltd

Inventors

• Ham Jung-Hyun

Classifications

• G02B6/0055

  Reflecting element, sheet or layer · CPC title

• G02B6/005 Primary

  provided by one optical element, or plurality thereof, placed on the light output side of the light guide · CPC title

• G02F1/133603

  with LEDs · CPC title

• G02B6/0088

  of the light guide or other optical sheets in the package · CPC title

• G02F1/133615 Primary

  Edge-illuminating devices, i.e. illuminating from the side · CPC title