DISPLAY DEVICE AND EPITAXIAL WAFER

• US 20190319017A1
• Filed: 06/27/2019
• Published: 10/17/2019
• Est. Priority Date: 03/08/2017
• Status: Active Grant

• Current Assignee: PlayNitride Display Co., Ltd.
• Original Assignee: PlayNitride Inc.
• Inventors: LAI, Yu-Hung
• Granted Patent: US 10,784,238 B2
• Time in Patent Office: Days
• CPC Class Codes: H01L 22/10 Measuring as part of the manufacturing process burn-in G01R31/2855
• CPC Class Codes: H01L 22/20 Sequence of activities consisting of a plurality of measurements, corrections, marking or sorting steps
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H10K 59/352 the areas of the RGB subpixels being different
• CPC Class Codes: H10K 59/353 characterised by the geometrical arrangement of the RGB subpixels

Abstract

Disclosed are an epitaxial wafer and a display device that includes a display substrate, a first sub pixel unit and a second sub pixel unit. The first sub pixel unit has a first luminous area, and the second sub pixel unit has a second luminous area different from the first luminous area. The first sub pixel unit and the second sub pixel unit belong to the same color type and are located in different pixel units. The first sub pixel unit is a sub epitaxial structure emitting light within a first photoluminescent wavelength, the second sub pixel unit is a sub epitaxial structure emitting light within a second photoluminescent wavelength, and the first photoluminescent wavelength is different from the second photoluminescent wavelength. The difference between electroluminescent wavelengths of the first sub pixel unit and the second sub pixel unit is less than or equal to 2 nm.

Claims

1. A display device, comprising:

a display substrate; and

a plurality of pixel units, comprising;

a first pixel unit located on the display substrate and comprising a first sub pixel unit having a first luminous area; and

a second pixel unit located on the display substrate and comprising a second sub pixel unit having a second luminous area, and the first luminous area and the second luminous area being different;

wherein the first sub pixel unit and the second sub pixel unit belong to the same color type, the first sub pixel unit and the second sub pixel unit are located in different pixel units, the first sub pixel unit is from a sub epitaxial structure emitting light within a first photoluminescent wavelength, the second sub pixel unit is from a sub epitaxial structure emitting light within a second photoluminescent wavelength, and the first photoluminescent wavelength is different from the second photoluminescent wavelength;

wherein a difference between a first electroluminescent wavelength of the first sub pixel unit and a second electroluminescent wavelength of the second sub pixel unit is less than or equal to 2 nm.

2. The display device according to claim 1, wherein the first sub epitaxial structure and the second sub epitaxial structure are formed from a same epitaxial wafer.

3. The display device according to claim 2, wherein a relative location of the first and second sub epitaxial structures formed from the epitaxial wafer is substantially equal to a relative location of the first and second sub pixel units on the display substrate.

4. The display device according to claim 1, wherein the first photoluminescent wavelength is larger than the second photoluminescent wavelength, and the first luminous area is smaller than the second luminous area.

5. The display device according to claim 1, further comprising a third pixel unit located on the display substrate and comprising a third sub pixel unit having a third luminous area,

wherein the first sub pixel unit, the second sub pixel unit and the third sub pixel unit belong to the same color type and are located in different pixel units,

wherein the first luminous area, the second luminous area and the third luminous area are different from one another.

6. The display device according to claim 5, wherein the third sub pixel unit is from a sub epitaxial structure emitting light within a third photoluminescent wavelength, a difference between any two of the first electroluminescent wavelength of the first sub pixel unit, the second electroluminescent wavelength of the second sub pixel unit and a third electroluminescent wavelength of the third sub pixel unit is less than or equal to 2 nm;

wherein the third photoluminescent wavelength is larger than the first photoluminescent wavelength, and the first photoluminescent wavelength is larger than the second photoluminescent wavelength;

wherein the second luminous area is larger than the first luminous area, and the first luminous area is larger than the third luminous area.

7. The display device according to claim 1, further comprising a third pixel unit located on the display substrate and comprising a third sub pixel unit, the first pixel unit, the second pixel unit and the third pixel unit are linearly arranged in sequence;

wherein the first sub pixel unit, the second sub pixel unit and the third sub pixel unit belong to the same color type and are located in different pixel units;

wherein a minimum distance between the first sub pixel unit and the second sub pixel unit is different from a minimum distance between the second sub pixel unit and the third sub pixel unit.

8. The display device according to claim 1, wherein the first luminous area and the second luminous area have a same geometric shape.

9. The display device according to claim 1, wherein for any two pixel units each comprising a sub pixel unit belonging to a first color type and another sub pixel unit belonging to a second color type different from the first same color type, a sum of luminous areas of the sub pixel units belonging to the first color type is different from a sum of luminous areas of the sub pixel units belonging to the second color type.

10. The display device according to claim 9, wherein for any two pixel units each comprising a plurality of sub pixel units, a sum of luminous areas of the sub pixel units of one of the two pixel units is different from a sum of luminous areas of the sub pixel units of the other pixel unit.

11. The display device according to claim 1, wherein a difference between the first photoluminescent wavelength and the second photoluminescent wavelength is larger than the difference between a first electroluminescent wavelength of the first sub pixel unit and a second electroluminescent wavelength of the second sub pixel unit.