Display apparatus and electronic equipment

Patent metadata

Field	Value
Publication number	US-12417732-B2
Application number	US-202218716110-A
Country	US
Kind code	B2
Filing date	Nov 15, 2022
Priority date	Dec 10, 2021
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

Provided is a display apparatus that can suppress degradation of image quality caused by possible color drift. A display apparatus includes a board including a driving circuit based on a current amplitude modulation scheme, multiple first light emitting elements and multiple second light emitting elements two-dimensionally arranged on the board, and a wavelength correcting layer that is able to correct wavelengths of light emitted from the multiple first light emitting elements. The driving circuit is able to independently gamma-correct a first signal fed to the first light emitting element and a second signal fed to the second light emitting element.

First claim

The invention claimed is:

1. A display apparatus, comprising:
a board including a driving circuit, wherein the driving circuit is based on a current amplitude modulation scheme;
multiple first light emitting elements;
multiple second light emitting elements, wherein the multiple first light emitting elements and the multiple second light emitting elements have a two-dimensional arrangement on the board; and
a wavelength correcting layer configured to correct wavelengths of light emitted from the multiple first light emitting elements, wherein
the driving circuit is configured to independently gamma-correct a first signal fed to each first light emitting element of the multiple first light emitting elements and a second signal fed to each second light emitting element of the multiple second light emitting elements.

2. The display apparatus according to claim 1 , wherein a first light emitting element of the multiple first light emitting elements is configured to cause an emission wavelength shift in response to a change in current density of the first light emitting element.

3. The display apparatus according to claim 1 , wherein the driving circuit is further configured to control luminance of a first light emitting element of the multiple first light emitting elements to compensate for a reduction in luminance caused by the wavelength correcting layer.

4. The display apparatus according to claim 1 , wherein the wavelength correcting layer is on or above the multiple first light emitting elements.

5. The display apparatus according to claim 1 , wherein
the each first light emitting element includes a first compound semiconductor light emitting element, and
the first compound semiconductor light emitting element is configured to emit green light.

6. The display apparatus according to claim 5 , wherein
the each second light emitting element includes a second compound semiconductor light emitting element and a third compound semiconductor light emitting element,
the second compound semiconductor light emitting element is configured to emit red light, and
the third compound semiconductor light emitting element is configured to emit blue light.

7. The display apparatus according to claim 1 , wherein
the each first light emitting element includes one type of light emitting element or two types of light emitting elements selected from a group, and
the group includes a first compound semiconductor light emitting element configured to emit green light, a second compound semiconductor light emitting element configured to emit red light, and a third compound semiconductor light emitting element configured to emit blue light.

8. The display apparatus according to claim 7 , wherein the each second light emitting element includes light emitting elements other than the one type of light emitting element or the two types of light emitting elements.

9. The display apparatus according to claim 1 , wherein a first light emitting element of the multiple first light emitting elements includes a GaN-based compound semiconductor light emitting element.

10. The display apparatus according to claim 1 , wherein a first peak wavelength of a first light emitting element of the multiple first light emitting elements at a first time of weak excitation is closer to a central wavelength of the wavelength correcting layer than a second peak wavelength of the first light emitting element at a second time of strong excitation.

11. The display apparatus according to claim 1 , wherein the wavelength correcting layer is a color filter.

12. The display apparatus according to claim 1 , wherein the wavelength correcting layer is a wavelength cut filter.

13. The display apparatus according to claim 1 , wherein the wavelength correcting layer is a color converting layer.

14. The display apparatus according to claim 1 , wherein the wavelength correcting layer is a bandpass filter.

15. The display apparatus according to claim 1 , wherein
the wavelength correcting layer is on or above the multiple first light emitting elements and the multiple second light emitting elements, and
the wavelength correcting layer is further configured to:
block light in a part of a wavelength range of a first light emitting element of the multiple first light emitting elements; and
allow light in a remaining part of the wavelength range to transmit therethrough.

16. The display apparatus according to claim 1 , wherein
a first light emitting element of the multiple first light emitting elements and the wavelength correcting layer constitute a first subpixel,
a second light emitting element of the multiple second light emitting elements constitutes a second subpixel, and
the first subpixel has a larger area than the second subpixel.

17. The display apparatus according to claim 1 , wherein
the wavelength correcting layer includes multiple wavelength correcting sections and a light blocking section,
each wavelength correcting section of the multiple wavelength correcting sections is on or above a first light emitting element of the multiple first light emitting elements, and
the light blocking section is around or on a wavelength correcting section of the multiple wavelength correcting sections.

18. Electronic equipment, comprising:
the display apparatus according to claim 1 .

19. A display apparatus, comprising:
a board including a driving circuit, wherein the driving circuit is based on a current amplitude modulation scheme;
multiple first light emitting elements; and
multiple second light emitting elements, wherein
the multiple first light emitting elements and the multiple second light emitting elements have a two-dimensional arrangement on the board,
each first light emitting element of the multiple first light emitting elements has a resonator structure,
the resonator structure is configured to correct light emitted from a first light emitting element of the multiple first light emitting elements, and
the driving circuit is configured to independently gamma-correct a first signal fed to the each first light emitting element and a second signal fed to each second light emitting element of the multiple second light emitting elements.

20. The display apparatus according to claim 19 , wherein
a first light emitting element of the multiple first light emitting elements is configured to cause an emission wavelength shift in response to a change in current density of the first light emitting element, and
the resonator structure is further configured to resonate and emphasize light of a defined color included in light subjected to the wavelength shift in response to the change in the current density of the first light emitting element.

Assignees

• Sony Group Corp

Inventors

• Watanabe Toshihiko
• Nagasawa Koichi
• Tajiri Shinichiro
• Minami Tetsuo
• Kimura Kei

Classifications

• H10W90/00

  Package configurations · CPC title

• G09G2320/0673

  for control of gamma adjustment, e.g. selecting another gamma curve · CPC title

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• H10H20/851

  Wavelength conversion means · CPC title