Display device and lighting apparatus

• US 10,546,979 B2
• Filed: 10/25/2018
• Issued: 01/28/2020
• Est. Priority Date: 05/31/2017
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: InnoLux Corporation
• Inventors: Chen, Jia-Yuan, Tsai, Tsung-Han, Lin, Hsiao-Lang, Yueh, Jui-Jen, Lee, Kuan-Feng
• Primary Examiner(s): Cao, Phat X
• Application Number:
  US16/171,354
• Publication Number:
  US 20190067533A1
• Time in Patent Office: 460 Days
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 33/483 Containers
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/508 having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

A display includes a light source, wherein the light source includes a base plate, a light emitting unit, and a light converting component. The light emitting unit is disposed on the base plate and has a first top surface. The light converting component covers the light emitting unit and has a second top surface and plural light converting elements, wherein the first top surface is located between the second top surface and the base plate. The light converting component includes a first region, a second region, and a third region from the first top surface to the second top surface, wherein a first sulfur content of the first region is less than a second sulfur content of the second region, and the first sulfur content of the first region is less than a third sulfur content of the third region.

Claims

1. A display device, comprising:

a light source, comprising;

a base plate;

a light emitting unit disposed on the base plate, the light emitting unit having a first top surface and a first bottom surface, and the first bottom surface being adjacent to the base plate and opposite to the first top surface; and

a light converting component covering the light emitting unit, the light converting component having a second top surface, the first top surface being located between the second top surface and the base plate, and the light converting component comprising a light converting layer comprising a plurality of light converting elements,

wherein a distance between the first top surface and the second top surface in a direction perpendicular to the base plate is defined as h,

wherein, above the first top surface, a region of the light converting component from the first top surface to 0.01 h is defined as a first region with a first sulfur content, a region of the light converting component from the 0.01 h to 0.99 h is defined as a second region with a second sulfur content, and a region of the light converting component from the 0.99 h to the second top surface is defined as a third region with a third sulfur content,

wherein the first sulfur content is less than the second sulfur content, and the first sulfur content is less than the third sulfur content,

wherein the light converting component further comprises an encapsulation layer, the encapsulation layer is disposed between the light converting layer and the base plate, and the display device further comprises a first diffusion film disposed between the light converting layer and the encapsulation layer,

wherein the display device further comprises at least one pin disposed between the first diffusion film and the base plate.

2. The display device of claim 1, wherein the second sulfur content is less than the third sulfur content.

3. The display device of claim 1, wherein the first sulfur content to the second sulfur content is defined as a first ratio, the first sulfur content to the third sulfur content is defined as a second ratio, the first ratio is greater than or equal to 0 and less than or equal to 0.75, and the second ratio is greater than or equal to 0 and less than or equal to 0.75.

4. The display device of claim 1, wherein the first region has a first zinc content, the second region has a second zinc content, the third region has a third zinc content, and the first zinc content is less than the second zinc content, and the first zinc content is less than the third zinc content.

5. The display device of claim 4, wherein the second zinc content is less than the third zinc content.

6. The display device of claim 1, wherein, the encapsulation layer covers the first top surface of the light emitting unit, the plurality of light converting elements is disposed in the light converting layer, and a sulfur content of the encapsulation layer is less than a sulfur content of the light converting layer.

7. The display device of claim 6, wherein a portion of a top surface of the encapsulation layer directly above the light emitting unit is a concave surface or a convex surface.

8. The display device of claim 6, wherein the light source further comprises a frame disposed on the base plate and around the light emitting unit, the encapsulation layer is in contact with a portion of a sidewall of the frame and a portion of a top surface of the frame, and the encapsulation layer comprises an inorganic material.

9. The display device of claim 6, wherein the light source further comprises a frame disposed on the base plate and around the light emitting unit, the encapsulation layer is in contact with a portion of a sidewall of the frame, the light converting layer is in contact with a rest portion of the sidewall of the frame, and the encapsulation layer comprises an organic material.

10. The display device of claim 1, wherein the plurality of light converting elements comprises a plurality of first light converting elements and a plurality of second light converting elements, the plurality of first light converting elements converts a light emitted from the light emitting unit into a first converted light with a first color, the plurality of second light converting elements converts the light emitted from the light emitting unit into a second converted light with a second color, and the first color is different from the second color.

11. The display device of claim 1, wherein the light source further comprises a first protection layer, and the first protection layer is disposed between the base plate and the light converting component.

12. The display device of claim 1, wherein the light source further comprises a second protection layer, and the light converting component is disposed between the second protection layer and the base plate.

13. The display device of claim 1, wherein the light source comprises a plurality of light emitting units, a plurality of light converting components and a frame, the frame is disposed on the base plate and comprises a plurality of cavities, wherein one of the light emitting units is covered by one of the light converting components and is disposed in one of the cavities.

14. The display device of claim 13, wherein the plurality of light converting elements in the light converting component in one of the cavities converts a light emitted from the light emitting unit into a converted light with a color.

15. The display device of claim 14, wherein the plurality of light converting elements in the light converting component in one of the cavities converts a light emitted from the light emitting unit into a converted light with a color different from a color of a converted light converted by the plurality of light converting elements in the light converting component in another one of the cavities.

16. The display device of claim 1, wherein the display device further comprises:

a second diffusion film disposed on the light converting layer, wherein the light converting layer is disposed between the first diffusion film and the second diffusion film; and

a prism film disposed on the second diffusion film, wherein the second diffusion film is disposed between the prism film and the light converting layer.

17. The display device of claim 1, wherein the light converting component further comprises an encapsulation layer and a light converting layer, the encapsulation layer is disposed between the light converting layer and the base plate, and a top surface of the light converting layer is a convex surface.

18. The display device of claim 1, wherein the light converting component further comprises an encapsulation layer and a light converting layer, the encapsulation layer is disposed between the light converting layer and the base plate, the light converting layer comprises a top surface, a bottom surface, and a side surface, the bottom surface is disposed between the top surface and the light emitting unit, the encapsulation layer covers the bottom surface and the side surface of the light converting layer, and the light source further comprises:

a blocking filter disposed on the light converting layer and the encapsulation layer, wherein the light converting layer is disposed between the blocking filter and the light emitting unit.

19. The display device of claim 1, wherein the light converting component further comprises an encapsulation layer and a light converting layer, the encapsulation layer is disposed between the light converting layer and the base plate, and the light source further comprises:

a frame disposed on the encapsulation layer and adjacent to the light converting layer; and

a blocking filter disposed on the light converting layer and the frame, wherein the light converting layer is disposed between the blocking filter and the encapsulation layer.