Display pixels with integrated pipeline
A display is created using “smart pixels.” A smart pixel is a pixel of a display that integrates the pixel pipeline as part of the pixel, rather than using separate integrated circuits. A smart pixel may be based on an integrated stack that includes light emitting elements, an external data contact for receiving digital data for that pixel, and also the pixel pipeline from the digital data to the light emitting elements.
1. A display comprising: a substrate; and
a plurality of devices arranged on the substrate to form color pixels of the display, each device comprising an integrated stack with:
at least two gallium nitride (GaN) light emitting diodes (LEDs) that produce light for an individual color pixel of the display;
an external data contact for receiving digital data that represents the individual color pixel in a color space; and
a pixel pipeline between the external data contact and the gallium nitride (GaN) LEDs, the pixel pipeline converting the digital data into drive signals for the gallium nitride (GaN) LEDs.
2. The display of claim 1 wherein the external data contact is the only external signal contact for the pixel pipeline.
3. The display of claim 2 wherein the individual color pixel comprises at least two subpixels of different colors.
4. The display of claim 2 wherein the digital data is in a standardized color format.
5. The display of claim 1 wherein each device is connected to a data bus.
6. The display of claim 1 wherein the external data contact is located on a side of the integrated stack.
7. The display of claim 1 wherein the LEDs are different color LEDs.
8. The display of claim 1 wherein the LEDs are same color LEDs, and the integrated stack further comprises color conversion material to convert light from at least one of the LEDs to a different color.
9. The display of claim 1 wherein the substrate has depressions, and the devices are located in the depressions.
10. The display of claim 1 wherein the substrate is flexible.
11. The display of claim 1 wherein the substrate is transparent, and the devices occupy less than 25% of an area of the substrate.
12. The display of claim 1 wherein the substrate is borderless around the devices.
13. A display comprising: a substrate; and
a plurality of devices arranged on the substrate to form pixels of the display, each device comprising an integrated stack containing:
at least two gallium nitride (GaN) light emitting elements for a set of one or more pixels of the display;
an external data contact for receiving digital data representing the set of pixels; and
a set of one or more pixel pipelines between the external data contact and the gallium nitride (GaN) light emitting elements, the pixel pipeline converting the digital data into drive signals for the gallium nitride (GaN) light emitting elements.
14. A device for displaying a color pixel of a display, the device including an integrated stack comprising:
at least two gallium nitride (GaN) light emitting diodes (LEDs) that produce light for an individual color pixel of the display;
an external data contact for receiving digital data that represents the individual color pixel in a color space; and
a pixel pipeline between the external data contact and the gallium nitride (GaN) LEDs, the pixel pipeline converting the digital data into drive signals for the gallium nitride (GaN) LEDs.
15. The device of claim 14 wherein the integrated stack further comprises:
a memory that stores calibration data for the device, wherein the pixel pipeline applies the calibration data in producing the drive signals.
16. The device of claim 15 wherein the calibration data includes color calibration data, and the pixel pipeline converts the received digital data to the drive signals according to the color calibration data.
17. The device of claim 15 wherein the calibration data includes brightness calibration data, and the pixel pipeline converts the received digital data to the drive signals according to the brightness calibration data.
18. The device of claim 15 wherein the calibration data includes temperature calibration data, and the pixel pipeline converts the received digital data to the drive signals according to the temperature calibration data.
19. The device of claim 14 wherein the pixel pipeline in the integrated stack comprises CMOS analog circuits, CMOS digital circuits and memory.
20. The device of claim 14 wherein the integrated stack further comprises:
isolation between the LEDs.
21. The device of claim 14 wherein a base of the integrated stack has an area not larger than an area of the LEDs.
22. The device of claim 14 wherein a height of the integrated stack is greater than a width of the integrated stack.
23. The device of claim 14 wherein the LEDs are separated by not more than 500 nm.