Lighting device

• US 9,863,599 B2
• Filed: 10/01/2014
• Issued: 01/09/2018
• Est. Priority Date: 06/19/2014
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Li, Wenbo, Wu, Yanbing, Dong, Yefei
• Primary Examiner(s): Bowman, Mary Ellen
• Application Number:
  US14/443,715
• Publication Number:
  US 20160178157A1
• Time in Patent Office: 1,196 Days
• CPC Class Codes: F21V 14/003 by interposition of elements with electrically controlled variable light transmissivity, e.g. liquid crystal elements or electrochromic devices
• CPC Class Codes: F21V 3/06 characterised by the material
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: F21Y 2115/15 Organic light-emitting diodes [OLED]
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals

Abstract

The present invention discloses a lighting device provided with an electronic lamp cover (30) surrounding a light emitting component (20). The electronic lamp cover (30) can present different light transmitting states according to different voltage values applied thereto within an operation voltage range so as to change the illumination angle and illumination brightness of the illumination light of the lighting device.

Claims

1. A lighting device, comprising:

a support;

a light emitting component mounted on the support; and

an electronic lamp cover mounted on the support to surround the light emitting component;

wherein the electronic lamp cover presents different light transmitting states upon the electronic lamp cover being applied with different voltage values within an operation voltage range,

wherein the electro-variable light transmittance layer is made of a material of photoelectric crystal, and the photoelectric crystal comprises KH₂PO₄, NH₄H₂PO₄, KH₂AsO₄ and KD₂PO₄.

2. The lighting device of claim 1, wherein a light transmittance of the electronic lamp cover increases with the voltage value applied thereto within the operation voltage range.

3. The lighting device of claim 1, wherein the electronic lamp cover comprises:

two layers of electrodes opposite to each other;

an electro-variable light transmittance layer disposed between the two layers of electrodes; and

a voltage controlling circuit configured to control a voltage difference between the two layers of electrodes.

4. The lighting device of claim 1, wherein the light emitting component comprises LED lamp and OLED lamp.

5. The lighting device of claim 3, wherein a light emitting controlling circuit that controls the light emitting component and the voltage controlling circuit that is configured to control the voltage difference between the two layers of electrodes of the electronic lamp cover are integrated on a same circuit board.

6. The lighting device of claim 1, further comprising:

a strip grating disposed between the electronic lamp cover and the light emitting component; and

an adjusting device configured to adjust an emergent angle of light at a light transmitting region of the strip grating.

7. The lighting device of claim 2, wherein the electronic lamp cover comprises:

two layers of electrodes opposite to each other;

an electro-variable light transmittance layer disposed between the two layers of electrodes; and

a voltage controlling circuit configured to control a voltage difference between the two layers of electrodes.

8. The lighting device of claim 7, wherein the electro-variable light transmittance layer is made of a material of photoelectric crystal or polymer liquid crystal.

9. The lighting device of claim 8, wherein the photoelectric crystal comprises KH₂PO₄, NH₄H₂PO₄, KH₂AsO₄ and KD₂PO₄.

10. The lighting device of claim 7, wherein a light emitting controlling circuit that controls the light emitting component and the voltage controlling circuit that is configured to control the voltage difference between the two layers of electrodes of the electronic lamp cover are integrated on a same circuit board.

11. The lighting device of claim 2, further comprising:

a strip grating disposed between the electronic lamp cover and the light emitting component; and

an adjusting device configured to adjust an emergent angle of light at a light transmitting region of the strip grating.

12. The lighting device of claim 3, further comprising:

a strip grating disposed between the electronic lamp cover and the light emitting component; and

an adjusting device configured to adjust an emergent angle of light at a light transmitting region of the strip grating.

13. The lighting device of claim 1, further comprising:

a strip grating disposed between the electronic lamp cover and the light emitting component; and

an adjusting device configured to adjust an emergent angle of light at a light transmitting region of the strip grating.

14. The lighting device of claim 5, further comprising:

a strip grating disposed between the electronic lamp cover and the light emitting component; and

an adjusting device configured to adjust an emergent angle of light at a light transmitting region of the strip grating.