Display device and lighting apparatus

• US 10,497,842 B2
• Filed: 08/31/2017
• Issued: 12/03/2019
• 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:
  US15/691,765
• Publication Number:
  US 20180351054A1
• Time in Patent Office: 824 Days
• 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: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/501 characterised by the materials, e.g. binder
• 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 33/56 Materials, e.g. epoxy or silicone resin
• 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 an encapsulation layer. The light emitting unit is disposed on the base plate and has a first top surface. The encapsulation layer 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 encapsulation layer 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 adjacent to the base plate and opposite to the first top surface; and

an encapsulation layer covering the light emitting unit, the encapsulation layer having a second top surface, the first top surface located between the second top surface and the base plate, and the encapsulation layer comprising a plurality of light converting elements and a sulfur based dispersant,

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 encapsulation layer from the first top surface to 0.01 h is defined as a first region with a first sulfur content, a region of the encapsulation layer from the 0.01 h to 0.5 h is defined as a second region with a second sulfur content, and a region of the encapsulation layer from the 0.5 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, the first sulfur content is less than the third sulfur content, and the second sulfur content is less than the third sulfur content.

2. 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.

3. 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.

4. The display device of claim 3, wherein the second zinc content is less than the third zinc content.

5. The display device of claim 1, wherein the encapsulation layer comprises a first encapsulation portion and a second encapsulation portion, the first encapsulation portion is disposed between the second encapsulation portion and the base plate, the first encapsulation portion covers the first top surface of the light emitting unit, the plurality of light converting elements is disposed in the second encapsulation portion, and a sulfur content of the first encapsulation portion is less than a sulfur content of the second encapsulation portion.

6. The display device of claim 5, wherein a portion of a top surface of the first encapsulation portion directly above the light emitting unit is a concave surface or a convex surface.

7. The display device of claim 5, wherein the light source further comprises a frame disposed on the base plate and around the light emitting unit, the first encapsulation portion is in contact with a portion of a sidewall of the frame and a portion of a top surface of the frame, and the first encapsulation portion comprises an inorganic material.

8. The display device of claim 5, wherein the light source further comprises a frame disposed on the base plate and around the light emitting unit, the first encapsulation portion is in contact with a portion of a sidewall of the frame, the second encapsulation portion is in contact with a rest portion of the sidewall of the frame, and the first encapsulation portion comprises an organic material.

9. 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.

10. The display device of claim 9, wherein the plurality of first light converting elements and the plurality of second light converting elements are mixed in the encapsulation layer.

11. The display device of claim 9, wherein part of the plurality of first light converting elements is disposed more closer to the light emitting unit than part of the plurality of second light converting elements.

12. 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 encapsulation layer.

13. The display device of claim 1, wherein the light source further comprises a protection layer, the encapsulation layer is disposed between the protection layer and the base plate, and the protection layer comprises an oxide film or a nitride film.

14. The display device of claim 13, wherein the light source further comprises a frame disposed on the base plate and around the light emitting unit, the second protection layer comprises an extending part disposed on the frame, the extending part comprises a bottom surface adjoining to the frame and a side surface connected to the bottom surface, wherein the side surface and the bottom surface include an acute angle.

15. The display device of claim 13, wherein the light source further comprises a frame disposed on the base plate and around the light emitting unit, the second protection layer comprises an extending part disposed on the frame, the extending part comprises a bottom surface adjoining to the frame, wherein the bottom surface comprises a first width W1, a top surface of the frame comprises a second width W2, and W1≥

1/10W2.

16. The display device of claim 1, wherein the light source comprises a plurality of light emitting units, a plurality of encapsulation layers 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 encapsulation layers and is disposed in one of the cavities.

17. The display device of claim 16, wherein the plurality of light converting elements in the encapsulation layer in one of the cavities converts a light emitted from the light emitting unit into a converted light with a color.

18. The display device of claim 17, wherein the plurality of light converting elements in the encapsulation layer 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 encapsulation layer in another one of the cavities.

19. A lighting apparatus, 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 adjacent to the base plate and opposite to the first top surface; and

an encapsulation layer covering the light emitting unit, the encapsulation layer having a second top surface, the first top surface located between the second top surface and the base plate, and the encapsulation layer comprising a plurality of light converting elements and a sulfur based dispersant,

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 encapsulation layer from the first top surface to 0.01 h is defined as a first region with a first sulfur content, a region of the encapsulation layer from the 0.01 h to 0.5 h is defined as a second region with a second sulfur content, and a region of the encapsulation layer from the 0.5 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, the first sulfur content is less than the third sulfur content, and the second sulfur content is less than the third sulfur content.