Light emitting apparatus, display section, and controller circuit

• US 10,453,382 B2
• Filed: 10/14/2015
• Issued: 10/22/2019
• Est. Priority Date: 10/14/2014
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Taguchi, Haruhisa
• Primary Examiner(s): Lam, Vinh T
• Application Number:
  US14/882,460
• Publication Number:
  US 20160104416A1
• Time in Patent Office: 1,469 Days
• Field of Search: 345690, 345698, 345 39- 40, 345 44- 48, 345 55, 345 59, 345 67, 345 72- 73, 345 82- 84, 315 3963, 315 42- 43, 315 8461, 315145, 315147, 315167, 315202, 315232, 315235, 315260, 315334
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2340/0457 Improvement of perceived resolution by subpixel rendering
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]

Abstract

Second light emitting elements and third light emitting elements are disposed at common grid-points that are adjacent in four directions to each grid-point where a first light emitting element is disposed. The controller circuit samples input data at each grid-point to generate display data to illuminate each light emitting element; controls first light emitting element illumination based on first light emitting element color information contained in first display data, which are display data sampled at each grid-point where a first light emitting element is disposed; controls second light emitting element illumination based on second light emitting element color information contained in second display data, which are display data sampled at each grid-point where a second and third light emitting element is disposed; and controls third light emitting element illumination based on third light emitting element color information contained in the second display data.

Claims

1. A light emitting apparatus comprising:

a display section having a plurality of packages disposed in a matrix array; and

a controller circuit to control illumination of each of the plurality of packages based on input data corresponding to an image to be displayed by the display section,

wherein the plurality of packages comprises;

first packages consisting essentially of one or more red light emitting diodes adapted to emit red color; and

second packages consisting essentially of one or more green light emitting diodes adapted to emit green color and one or more blue light emitting diodes adapted to emit blue color, the second packages being physically separated from the first packages,

wherein a display section matrix is made up of a plurality of grid-points, the second packages are disposed at grid-points that are adjacent in four directions to each grid-point where the first package is disposed, and

wherein the controller circuit is configured to sample input data at each grid-point and generate display data to illuminate each package;

to control red light emitting diode illumination based on red light emitting diode color information contained in first display data, which are display data sampled at each grid-point where the first package is disposed;

to control green light emitting diode illumination based on green light emitting diode color information contained in second display data, which are display data sampled at each grid-point where the second package is disposed; and

to control blue light emitting diode illumination based on blue light emitting diode color information contained in the second display data, which are display data sampled at each grid-point where the second package is disposed.

2. The light emitting apparatus as cited in claim 1

wherein a first grid-point, where the first package disposed, is grouped with at least one or more second grid-points, which are adjacent to the first grid-point in four directions and have the second packages disposed at each grid-point, and

wherein the controller circuit is configured to illuminate the green light emitting diode disposed at a second grid-point based on green light emitting diode color information in the first display data sampled at the first grid-point;

to illuminate the blue light emitting diode disposed at the second grid-point based on blue light emitting diode color information included in the first display data sampled at the first grid-point; and

to illuminate the red light emitting diode disposed at the first grid-point based on red light emitting diode color information included in the second display data sampled at the second grid-point.

3. The light emitting apparatus as cited in claim 2 wherein the first grid-point, where the first package disposed, is grouped with adjacent second grid-points in all four directions, and the packages are disposed at each second grid-point.

4. The light emitting apparatus as cited in claim 1 wherein the color emitted by the first package is complementary to mixed colors emitted by the second packages.

5. The light emitting apparatus as cited in claim 1 wherein a peak emission wavelength of the green light emitting diode and a peak emission wavelength of the blue light emitting diode are both be either shorter or longer than the peak emission wavelength of the red light emitting diode.

6. The light emitting apparatus as cited in claim 1 wherein a first grid-point where the first package is disposed and four second grid-points, which are adjacent in four directions to the first grid-point and have the second packages disposed at each grid-point, are oriented such that a line segment connecting a pair of horizontally disposed second grid-points is approximately perpendicular to a line segment connecting a pair of vertically disposed second grid-points.

7. The light emitting apparatus as cited in claim 6

wherein the plurality of grid-points that forms the display section matrix, which can be represented in an (x, y) coordinate system with orthogonal x and y axes, has a pitch between adjacent grid-points of x₀ in the x-direction and a pitch of y₀ in the y-direction;

wherein data sampled at (x, y) coordinate grid-points can be represented in an image spatial frequency domain via (μ

, ν

) coordinates with orthogonal μ and

ν

axes (where the μ

-axis is spatial frequency in the x-direction of the display section and the ν

-axis is spatial frequency in the y-direction) to define the region of spatial frequency where display is possible;

wherein a true-color region where both color and image geometry are displayed properly is defined for grid-point data sampled within a diamond-shaped region of the image spatial frequency domain having vertices at four (μ

, ν

) coordinates;

(½

x₀,

     0), (0, ½

y₀), (−

½

x₀,0), and (0, −

1/2 y₀); and

wherein a color-distortion region where image geometry is displayed properly, but color balance is not maintained is defined for grid-point data sampled in a region between the true-color region and a square region of the image spatial frequency domain having vertices at four μ

ν

) coordinates;

(½

x₀, ½

y₀), (−

½

x₀, ½

y₀), (−

½

x₀, −

½

y₀), and (½

x₀, −

½

y₀).

8. The light emitting apparatus as cited in claim 1,

wherein each of the first packages is disposed at a first grid-point without the second packages, and

wherein the second packages are positioned at a second grid-point without the first packages.

9. A display section comprising:

a plurality of packages disposed in a matrix array,

wherein the plurality of packages comprises;

first packages consisting essentially of one or more red light emitting diodes adapted to emit red color; and

second packages consisting essentially of one or more green light emitting diodes adapted to emit green color and one or more blue light emitting diodes adapted to emit blue color, the second packages being physically separated from the first packages,

wherein a display section matrix is made up of a plurality of grid-points, the second packages are disposed at grid-points that are adjacent in four directions to each grid-point where the first package is disposed;

wherein the display section is configured to control illumination of each package according to display data generated by sampling input data, which corresponds to an image to be displayed by the display section, at each grid-point, and

wherein the display section is configured to control illumination of the red light emitting diodes of the first packages based on red light emitting diode color information contained in first display data, which are display data sampled at each grid-point where the first package is disposed;

to control illumination of the green light emitting diodes of the second packages based on green light emitting diode color information contained in second display data, which are display data sampled at each grid-point where the second package is disposed; and

to control illumination of the blue light emitting diodes of the second packages based on blue light emitting diode color information contained in the second display data, which are display data sampled at each grid-point where the second package is disposed.

10. A controller circuit, which controls illumination of light emitting diodes disposed in a display section matrix array based on input data corresponding to an image to be displayed, the controller circuit comprising:

a display data generator that samples input data at each grid-point where a plurality of packages are disposed and generates display data to illuminate each light emitting diode,

wherein the plurality of packages comprises;

first packages consisting essentially of one or more red light emitting diodes adapted to emit red color; and

second packages consisting essentially of one or more green light emitting diodes adapted to emit green color and one or more blue light emitting diodes adapted to emit blue color, the second packages being physically separated from the first packages,

wherein the controller circuit is configured

to control illumination of the red light emitting diodes of the first packages, which emit red color, based on red light emitting diode color information contained in first display data, which are display data sampled at each grid-point where the first package is disposed separately and discretely from the second packages,

to control illumination of the green light emitting diodes of the second packages, which emit green color, based on green light emitting diode color information contained in second display data, which are display data sampled at each grid-point where the second packages are disposed, and

to control illumination of the blue light emitting diodes of the second packages, which emit blue color, based on blue light emitting diode color information contained in the second display data, which are display data sampled at each grid-point where the second packages are disposed.

11. A method of controlling illumination of light emitting diodes in a light emitting apparatus, the light emitting apparatus including a plurality of packages comprising:

first packages consisting essentially of one or more red light emitting diodes adapted to emit red color; and

second packages consisting essentially of one or more green light emitting diodes adapted to emit green color and one or more blue light emitting diodes adapted to emit blue color, the second packages being physically separated from the first packages,

the method comprising;

a first control operation that includes

control to illuminate the red light emitting diodes of the first packages based on red light emitting diode color information contained in first display data, which are display data sampled at each grid-point where the first package is disposed separately and discretely from the second packages,

control to illuminate the green light emitting diodes of the second packages based on green light emitting diode color information contained in second display data, which are display data sampled at each grid-point where the second packages are disposed; and

control to illuminate the blue light emitting diodes of the second packages based on blue light emitting diode color information contained in the second display data, which are display data sampled at each grid-point where the second packages are disposed.

12. The method as cited in claim 11 wherein a controller circuit to control illumination of the light emitting diodes based on input data corresponding to an image to be displayed by a display section having the plurality of packages disposed in a matrix array groups each first grid-point, where the first package disposed, with at least one or more second grid-points, which are adjacent to the first grid-point in four directions and have the second packages disposed at each grid-point;

and

the method further comprises;

a second control operation that includes

control to illuminate the green light emitting diode disposed at a second grid-point based on green light emitting diode color information in the first display data sampled at the first grid-point,

control to illuminate the blue light emitting diode disposed at the second grid-point based on blue light emitting diode color information included in the first display data sampled at the first grid-point, and

control to illuminate the red light emitting diode disposed at the first grid-point based on red light emitting diode color information included in the second display data sampled at the second grid-point.

13. The method as cited in claim 12 wherein the second control operation is performed after the first control operation.

14. The method as cited in claim 12 wherein the first control operation and the second control operation are performed simultaneously.

15. The method as cited in claim 11 wherein the first control operation includes

control to illuminate red light emitting diodes based on red light emitting diode color information contained in first display data, which are display data sampled at each grid-point where the first package is disposed;

control to illuminate green light emitting diodes based on green light emitting diode color information contained in second display data, which are display data sampled at each grid-point where the second package is disposed; and

control to illuminate blue light emitting diodes based on blue light emitting diode color information contained in the second display data is performed in a sequence, which are display data sampled at each grid-point where the second package is disposed.

16. The method as cited in claim 11 wherein the first control operation includes

control to illuminate red light emitting diodes based on red light emitting diode color information contained in first display data, which are display data sampled at each grid-point where the first package is disposed;

control to illuminate green light emitting diodes based on green light emitting diode color information contained in second display data, which are display data sampled at each grid-point where the second package is disposed; and

control to illuminate blue light emitting diodes based on blue light emitting diode color information contained in the second display data is performed simultaneously.

17. The method as cited in claim 12 wherein the second control operation includes

control to illuminate the green light emitting diode disposed at a second grid-point based on green light emitting diode color information in the first display data sampled at the first grid-point;

control to illuminate the blue light emitting diode disposed at the second grid-point based on blue light emitting diode color information included in the first display data sampled at the first grid-point; and

control to illuminate the red light emitting diode disposed at the first grid-point based on red light emitting diode color information included in the second display data sampled at the second grid-point is performed in a sequence.

18. The method as cited in claim 12 wherein the second control operation includes

control to illuminate the green light emitting diode disposed at a second grid-point based on green light emitting diode color information in the first display data sampled at the first grid-point;

control to illuminate the blue light emitting diode disposed at the second grid-point based on blue light emitting diode color information included in the first display data sampled at the first grid-point; and

control to illuminate the red light emitting diode disposed at the first grid-point based on red light emitting diode color information included in the second display data sampled at the second grid-point is performed simultaneously.

19. A light emitting apparatus comprising:

a display section having a plurality of packages disposed in a matrix array; and

a controller circuit to control illumination of each of the plurality of packages based on input data corresponding to an image to be displayed by the display section,

wherein the plurality of packages comprises;

first packages consisting essentially of one or more red light emitting diodes adapted to emit red color and one or more blue light emitting diodes adapted to emit blue color; and

second packages consisting essentially of one or more green light emitting diodes adapted to emit green color, the second packages being physically separated from the first packages,

wherein a display section matrix is made up of a plurality of grid-points;

the first packages are disposed at grid-points that are adjacent in four directions to each grid-point where the second package is disposed; and

wherein the controller circuit is configured to sample input data at each grid-point and generate display data to illuminate each package;

to control green light emitting diode illumination based on green light emitting diode color information contained in first display data, which are display data sampled at each grid-point where the second package is disposed;

to control red light emitting diode illumination based on red light emitting diode color information contained in second display data, which are display data sampled at each grid-point where the first package is disposed; and

to control blue light emitting diode illumination based on blue light emitting diode color information contained in the second display data, which are display data sampled at each grid-point where the first package is disposed.

20. A light emitting apparatus comprising:

a display section having a plurality of packages disposed in a matrix array; and

a controller circuit to control illumination of each of the plurality of packages based on input data corresponding to an image to be displayed by the display section,

wherein the plurality of packages comprises;

first packages consisting essentially of one or more red light emitting diodes adapted to emit red color and one or more green light emitting diodes adapted to emit green color; and

second packages consisting essentially of one or more blue light emitting diodes adapted to emit blue color, the second packages being physically separated from the first packages,

wherein a display section matrix is made up of a plurality of grid-points;

the first packages are disposed at grid-points that are adjacent in four directions to each grid-point where the second package is disposed; and

wherein the controller circuit is configured to sample input data at each grid-point and generate display data to illuminate each package;

to control blue light emitting diode illumination based on blue light emitting diode color information contained in first display data, which are display data sampled at each grid-point where the second package is disposed;

to control red light emitting diode illumination based on red light emitting diode color information contained in second display data, which are display data sampled at each grid-point where the first package is disposed; and

to control green light emitting diode illumination based on green light emitting diode color information contained in the second display data, which are display data sampled at each grid-point where the first package is disposed.