Display optimization techniques for micro-LED devices and arrays

1. A display device comprising:

an array of pixels, each pixel comprising a plurality of sub-pixels arranged in a matrix; and

a driving circuitry configured to provide an individual emission control signal to each sub-pixel of each pixel in the array of pixels to independently control an emission time and a duty cycle of each sub-pixel, the emission time of said each sub-pixel is T r *B full /B mj , wherein T f is a frame time of a frame, B full is a brightness of the display device when said each sub-pixel is on an optimized current density during the frame time, and B mj is a major brightness which is 30% of a peak brightness of the display device;

wherein each row of the array of pixels is accessed twice during the frame time, the frame including a first subframe and a second subframe following the first subframe, the first subframe is divided into a first emission time period and a first no emission time period following the first emission time period, and the second subframe is divided into a second emission time period and a second no emission time period following the second emission time period;

wherein the first emission time period is indicative of a first grayscale, the second emission time period is indicative of a second grayscale, and the second grayscale is higher than the first grayscale.

2. The display device of claim 1 , wherein a first emission control signal is provided concurrently to each sub-pixel of a first color in at least one row of pixels, a second emission control signal is provided concurrently to each sub-pixel of a second color in at least the one row of pixels, and a third emission control signal is provided concurrently to each sub-pixel of a third color in at least the one row of pixels.

3. The display device of claim 2 , wherein the first color is red, the second color is green, and the third color is blue.

4. The display device of claim 2 , wherein a fourth emission control signal is provided to each sub-pixel of a fourth color in the at least the one row of pixels, wherein the fourth color is one of cyan, white, and yellow.

5. The display device of claim 1 , wherein the individual emission control signal is a pulse-width-modulation (PWM) signal.

6. The display device of claim 1 , wherein each pixel and each sub-pixel is a micro-light emitting device (LED).

7. The display device of claim 2 , wherein the first, second, and third emission control signals are enabled at a same time or a different time during a frame time.

8. The display device of claim 6 , wherein the first, second, and third emission control signals are turned on and off one or more times at a different duty cycle during the frame time.

9. The display device of claim 1 , wherein the emission time or the duty cycle for each sub-pixel is dynamically adjusted to tune a display device color and optimize power consumption.

10. The display device of claim 9 , wherein the duty cycle is optimized for two range of grayscales to achieve a lowest power consumption.

11. The display device of claim 1 , wherein a frame data is evaluated to find an optimized duty cycle and the emission time.

12. The display device of claim 1 , wherein an optimization algorithm is employed to calculate a global optimized value or a local optimized value for the duty cycle or the emission time for each sub-pixel.

13. A method for controlling a pixel circuit of an array of pixel circuits of a display device, the pixel circuit comprising a plurality of sub-pixels, the method comprising:

providing an individual emission control signal to each sub-pixel of each pixel in the array of pixel circuits independently to control an emission time and a duty cycle of the plurality of sub-pixels, the emission time of said each sub-pixel is T f *B full /B mj , wherein T f is a frame time of a frame, B full is a brightness of the display device when said each sub-pixel is on an optimized current density during the frame time, and B mj is a major brightness which is 30% of a peak brightness of the display device;

accessing each row of the array of pixel circuits twice during the frame time, wherein the frame includes a first subframe and a second subframe following the first subframe, the first subframe is divided into a first emission time period and a first no emission time period following the first emission time period, and the second subframe is divided into a second emission time period and a second no emission time period following the second emission time period, wherein the first emission time period is indicative of a first grayscale, the second emission time period is indicative of a second grayscale, and the second grayscale is higher than the first grayscale.

14. The method of claim 13 , wherein the emission time or the duty cycle for each sub-pixel is dynamically adjusted to tune a display device color and optimize power consumption.

15. The method of claim 13 , wherein a frame data is evaluated to find an optimized duty cycle and the emission time.

16. The method of claim 13 , wherein an optimization algorithm is employed to calculate a global optimized value or a local optimized value for the duty cycle or the emission time for each sub-pixel.

17. The method of claim 13 , wherein the duty cycle is optimized for two range of grayscales to achieve a lowest power consumption.

18. The method of claim 13 , wherein the individual emission control signal is a pulse-width-modulation (PWM) signal.

19. The method of claim 13 , wherein each pixel and each sub-pixel is a micro-light emitting device (LED).

20. The method of claim 13 , further comprising:

providing a first emission control signal concurrently to each sub-pixel of a first color in at least one row of pixels;

providing a second emission control signal concurrently to each sub-pixel of a second color in the at least one row of pixels; and

providing a third emission control signal concurrently to each sub-pixel of a third color in the at least one row of pixels.