Dual-color projector

• US 10,459,326 B2
• Filed: 12/27/2018
• Issued: 10/29/2019
• Est. Priority Date: 06/03/2015
• Status: Active Grant

• Current Assignee: Hisense Co., Ltd. (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.)
• Original Assignee: Hisense Co., Ltd. (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.)
• Inventors: Tian, Youliang, Liu, Xianrong, Li, Wei
• Primary Examiner(s): Dowling, William C.
• Application Number:
  US16/233,747
• Publication Number:
  US 20190129290A1
• Time in Patent Office: 306 Days
• CPC Class Codes: G02B 26/008 in the form of devices for effecting sequential colour changes, e.g. colour wheels
• CPC Class Codes: G02B 27/1006 for splitting or combining different wavelengths G02B27/1086, G02B27/141 take precedence
• CPC Class Codes: G02B 27/143 using macroscopically faceted or segmented reflective surfaces
• CPC Class Codes: G02B 27/48 Laser speckle optics
• CPC Class Codes: G02B 5/0263 with positional variation of the diffusing properties, e.g. gradient or patterned diffuser
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G02B 5/0294 adapted to provide an additional optical effect, e.g. anti-reflection or filter
• CPC Class Codes: G03B 21/20 Lamp housings
• CPC Class Codes: G03B 21/2013 Plural light sources
• CPC Class Codes: G03B 21/204 using secondary light emission, e.g. luminescence or fluorescence using different colours G03B33/00; if related to video signals H04N9/3197
• CPC Class Codes: G03B 21/2066 Reflectors in illumination beam in projection beam G03B21/28
• CPC Class Codes: G03B 21/208 Homogenising, shaping of the illumination light
• CPC Class Codes: G03B 33/08 Sequential recording or projection G03B33/02, G03B33/04, G03B33/06 take precedence
• CPC Class Codes: H04N 9/3114 by using a sequential colour filter producing one colour at a time
• CPC Class Codes: H04N 9/3152 for shaping the light beam beam shaping per se G02B27/09
• CPC Class Codes: H04N 9/3158 for controlling the spectrum
• CPC Class Codes: H04N 9/3161 using laser light sources using laser beams scanning the display screen H04N9/3129
• CPC Class Codes: H04N 9/3164 using multiple light sources

Abstract

A dual-color projector is disclosed that includes a blue laser device configured to emit a blue laser light, a red laser device configured to emit a red laser light, and a fluorescent wheel whose surface is coated with green fluorescent powder which is excitable by the blue laser light to emit a green fluorescent light. The dual-color projector may also include a first diffusion element and a second diffusion element.

Claims

1. A dual-color projector, comprising

a blue laser emitter configured to emit a blue light;

a red laser emitter configured to emit a red light;

a disk comprising a surface coated with green fluorescent powder excitable by the blue light to emit a green fluorescence;

a first diffuser disposed in at least one of a blue light path of the blue light or a red light path of the red light; and

a second diffuser disposed on a side of a lightpipe in a light path between the first diffuser and the lightpipe, wherein the second diffuser is configured to rotate and output the blue light, the red light, and the green fluorescent light, to the lightpipe in a sequential sequence.

2. The dual-color projector according to claim 1, wherein, the first diffuser comprises a first diffuser sheet arranged in the blue light path of the blue light and a second diffuser sheet arranged in the red light path of the red light.

3. The dual-color projector according to claim 2, wherein, the first diffuser sheet is disposed in the blue light path between the blue laser emitter and a light-combining element, and the light-combining element is configured to output the blue light to the disk;

and

wherein the second diffuser sheet is disposed in the red light path between the red laser emitter and the light-combining element, and the light-combining element is configured to output the red light to the second diffuser.

4. The dual-color projector according to claim 1, wherein, the first diffuser comprises a blue light diffuser sheet arranged in the blue light path of the blue light between the blue laser emitter and a light-combining element, and the light-combining element is configured to output the blue light to the disk.

5. The dual-color projector according to claim 4, at least one convex lens and at least one concave lens are arranged in the blue light path of the blue light between the blue laser emitter and the blue light diffuser sheet.

6. The dual-color projector according to claim 1, wherein, the first diffuser comprise a red light diffuser sheet arranged in the red light path of the red light between the red laser emitter and a light-combining element, the light-combining element is configured to output the red light to the second diffuser.

7. The dual-color projector according to claim 6, at least one convex lens and at least one concave lens are arranged in the red light path of the red light between the red laser emitter and the red light diffuser sheet.

8. The dual-color projector according to claim 1, further comprising a light-combining element configured to receive the red light emitted from the first diffuser and the green fluorescence emitted from the disk, and output the green fluorescence and the red light in the same direction.

9. The dual-color projector according to claim 8, the light-combining element comprises at least one of a dichroic filter, a dichroic prism, or a cross dichroic prism.

10. The dual-color projector according to claim 1, wherein, the second diffuser comprises a filter zone transmissive for the green fluorescence, and a diffusion zone configured to be transmissive for the blue light and the red light.

11. The dual-color projector according to claim 10, wherein, a portion of the second diffuser in the filter zone is a green filter, and the green filter is configured to receive the green fluorescence to pass through.

12. The dual-color projector according to claim 10, wherein the diffusion zone comprises a blue light diffusion zone transmissive for the blue light and a red light diffusion zone transmissive for the red light.

13. A dual-color projector, comprising:

a blue laser emitter configured to emit a blue light and a red laser emitter configured to emit a red light;

a disk comprising a first zone and a second zone, wherein the first zone is coated with green fluorescent powder, and the second zone is transmissive for the blue light;

a first non-rotating diffuser disposed in a blue light path of the blue light between the blue laser emitter and a light-combining element;

a second non-rotating diffuser disposed in a red light path of the red light between the red laser emitter and the light-combining element;

the light-combining element configured to;

receive the blue light output by the first non-rotating diffuser

receive the red light output by the second non-rotating diffuser;

output the blue light to the disk; and

output the red light to a rotating diffuser in a first direction, wherein a first part of the blue light is configured to excite the green fluorescent powder to emit a green fluorescence, and a second part of the blue light is configured to pass through the second zone;

a first reflector system configured to change direction of the second part of the blue light passed through the second zone and render the second part of the blue light passed through the second zone to incident on the light-combining element,

the light-combining element is further configured to receive the second part of the blue light output by the first reflector system and the green fluorescent emitted from the disk, and output the second part of the blue light and the green fluorescent to the rotating diffuser in the first direction;

the rotating diffuser disposed on a side of a lightpipe in a light path between the first non-rotating diffuser and the lightpipe, wherein the rotating diffuser comprises a green filter configured to filter the green fluorescence output by the light-combining element, a blue light diffusion zone configured to diffuse the second part of the blue light output by the light-combining element, and a red diffusion zone configured to diffuse the red light output by the light-combining element; and

the lightpipe configured to receive the green fluorescence output by the rotating diffuser, the second part of the blue light output by the rotating diffuser, and the red light output by the rotating diffuser.

14. The dual-color projector according to claim 13, wherein the rotating diffuser outputs the green fluorescent, the second part of the blue light, and the red light in time sequence to the lightpipe.

15. The dual-color projector according to claim 13, wherein the green filter is a non-diffusion green filter.

16. The dual-color projector according to claim 13, the light-combining element comprises at least one of a dichroic filter, a dichroic prism, or a cross dichroic prism.

17. A dual-color projector, comprising

a first laser emitter configured to emit a first light;

a second laser emitter configured to emit a second light;

a disk comprising a surface coated with fluorescent powder excitable by the first light to emit a fluorescence which is different from the first and second light;

a first diffuser disposed in at least one of a first light path of the first light and a second light path of the second light; and

a second diffuser disposed on a side of a lightpipe in a light path between the first diffuser and the lightpipe, wherein the second diffuser is configured to rotate and output the first light, the second light, and the fluorescence to the lightpipe in a sequential sequence.

18. The dual-color projector of claim 17, wherein,

the first laser is a blue laser and the first light is a blue light;

the second laser is a red laser and the second light is a red light; and

the fluorescence is a green fluorescence.