Display apparatus

Patent metadata

Field	Value
Publication number	US-11747675-B2
Application number	US-202217580431-A
Country	US
Kind code	B2
Filing date	Jan 20, 2022
Priority date	Dec 13, 2019
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

A display apparatus, including: a backlight module and a panel. The backlight module includes: a circuit board, a light-emitting device, and a quantum dot film layer; a fluorescent layer is provided in an orthographic projection area of the light-emitting device on the circuit board, and the fluorescent layer can absorb incident light and excite white light. When light emitted from the light-emitting device is incident onto the orthographic projection area, the fluorescent layer may first excite white light using a portion of the light, so that the intensity of light reflected to the quantum dot film layer is relatively weakened to just meet requirements of a quantum dot material on saturation of excited light, and the excited light of the quantum dot material and unexcited blue light may be mixed into white light which provides white backlight for the panel together with the white light excited by the fluorescent layer.

First claim

What is claimed is:

1. A display apparatus, comprising:
a backlight module configured to provide backlight;
a panel disposed on a light emitting side of the backlight module and configured for image display;
the backlight module comprises:
a circuit board having bearing and support functions and configured to provide power;
a light emitting device arranged on the circuit board, wherein the light emitting device comprises: a light emitting diode disposed on the circuit board, and a lens at a light emitting side of the light emitting diode; and
a quantum dot film layer disposed on a side of the light emitting device facing away from the circuit board;
wherein a fluorescent layer is provided in an orthographic projection area of the lens at the light emitting side of the light emitting device on the circuit board, and the fluorescent layer is configured to absorb light emitted from the light emitting device to excite white light;
wherein the fluorescent layer comprises a ring-shaped fluorescent portion;
the ring-shaped fluorescent portion is unbroken and around the light emitting diode; and
a contour of the ring-shaped fluorescent portion is similar to an outer contour of the orthographic projection of the lens on the circuit board;
wherein the fluorescent layer comprises: rheolytical additives and fluorescent powders.

2. The display apparatus according to claim 1 , wherein the fluorescent layer comprises spot-shaped fluorescent portions; the spot-shaped fluorescent portions are distributed in at least one ring around the light emitting diode; and
a contour of the at least one ring is similar to an outer contour of the orthographic projection of the lens on the circuit board.

3. The display apparatus according to claim 2 , wherein the spot-shaped fluorescent portion is circular or square.

4. The display apparatus according to claim 2 , wherein a minimum width of the fluorescent portion is greater than or equal to 0.3 mm;
spacing between two adjacent fluorescent portions is greater than or equal to 0.5 mm.

5. The display apparatus according to claim 1 , wherein
the fluorescent layer comprises strip-shaped fluorescent portions;
the strip-shaped fluorescent portions are distributed around the light emitting diode; and
an extending direction of the strip-shaped fluorescent portions is directed from the light emitting diode to an outer edge of the lens.

6. The display apparatus according to claim 1 , wherein the fluorescent layer comprises two strip-shaped fluorescent portions parallel to each other;
the strip-shaped fluorescent portions are located at both sides of the light emitting diode and at areas corresponding to edges of the lens, and
both ends of a strip-shaped fluorescent portion extend to edges of the circuit board.

7. The display apparatus according to claim 1 , wherein
the fluorescent powders are yellow fluorescent powders; or the fluorescent powders are a mixture of red and green fluorescent powders.

8. The display apparatus according to claim 1 , wherein the backlight module further comprises:
a reflective coating film disposed on a surface of the circuit board close to the light emitting device, wherein the fluorescent layer is disposed on a surface of the reflective coating facing away from the circuit board;
a protective layer covering surfaces of the reflective coating film and the fluorescent layer facing away from the circuit board.

9. The display apparatus according to claim 1 , wherein the backlight module further comprises:
a diffuser between the quantum dot film layer and the light emitting device;
wherein a ratio of a distance from the light emitting device to the diffuser to spacing between two adjacent light emitting devices is less than 1/3.

Assignees

• Hisense Visual Tech Co Ltd

Inventors

• Cong Xiaodong
• Zhang Jibing
• Yan Gaobin
• Zhang Zhirui
• Gao Shang

Classifications

• H10W90/00

  Package configurations · CPC title

• H10H20/857

  Interconnections, e.g. lead-frames, bond wires or solder balls · CPC title

• H10H20/856

  Reflecting means · CPC title

• H10H20/855

  Optical field-shaping means, e.g. lenses · CPC title

• H10H20/8513

  having two or more wavelength conversion materials · CPC title