Backlight module

• US 9,939,678 B2
• Filed: 09/25/2014
• Issued: 04/10/2018
• Est. Priority Date: 09/01/2014
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Qiu, Yong yuan, Su, Zan jia
• Primary Examiner(s): TUMEBO, TSION M
• Application Number:
  US14/416,789
• Publication Number:
  US 20170168351A1
• Time in Patent Office: 1,293 Days
• Field of Search: 362618
• CPC Class Codes: G02B 6/005 provided by one optical element, or plurality thereof, placed on the light output side of the light guide
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• CPC Class Codes: G02F 2202/36 Micro- or nanomaterials

Abstract

A backlight module includes a light-emitting element, which can emit a first light with a wavelength in a first wavelength range, a quantum dot diaphragm, which is formed by combining a plurality of sub-diaphragms each with a small area together and can emit a second light with a wavelength in a second wavelength range and a third light with a wavelength in a third wavelength range, and a diffusing plate used for light homogenization. The defects of low qualified rate of quantum dot diaphragm with large area manufactured currently and a poor homogeneity thereof can be avoided.

Claims

1. A backlight module, comprising a light-emitting element, a quantum dot diaphragm, which is formed by combining a plurality of sub-diaphragms each with a small area together, with seams formed between two adjacent sub-diaphragms, and a diffusing plate used for light homogenization,

wherein a light emitted by said light-emitting element excites each quantum dot of said quantum dot diaphragm to emit light,

wherein a first diffusing plate and a second diffusing plate are provided, the quantum dot diaphragm being affixed on the first diffusing plate, and

said light-emitting element is laid on a back of said backlight module, and at a surface of said light-emitting element facing a liquid crystal cell, the first diffusing plate and the second diffusing plate are arranged in sequence along an optical path direction, with a first space formed between the first diffusing plate and the second diffusing plate, with a dimension of the first space, on a normal direction of the first diffusing plate, determined by a width of the seams formed between two adjacent sub-diaphragms.

2. The backlight module according to claim 1, wherein said quantum dot diaphragm completely covers the surface of said first diffusing plate.

3. The backlight module according to claim 2, wherein said dimension of the first space ranges from 3 mm to 15 mm in size.

4. The backlight module according to claim 3, wherein said quantum dot diaphragm is fixed on the surface of said first diffusing plate through ultraviolet-curing adhesive.

5. The backlight module according to claim 1, wherein said light-emitting element is capable of emitting blue light, and said quantum dots are capable of emitting red light and green light.

6. The backlight module according to claim 1, wherein said light-emitting element comprises a light-emitting diode array and a corresponding lens array that is located on a light-emitting surface of said light-emitting diode, and said backlight module further comprises a prism group for increasing a brightness of a light emitted by said backlight module.