Early pixel reset systems and methods

Patent metadata

Field	Value
Publication number	US-10417971-B2
Application number	US-201715664982-A
Country	US
Kind code	B2
Filing date	Jul 31, 2017
Priority date	Mar 17, 2017
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

An electronic device includes processors that generate image data. The electronic device also includes an electronic display that displays the image data over a first frame duration by programming a first row of display pixels with the image data. The electronic display also displays the image data over the first frame duration by causing the first row of display pixels to emit light for an emission duration that is based at least in part on a first luminance of the image data. The electronic display further displays the image data over the first frame duration by resetting the first row of pixels before an end of the first frame duration.

First claim

What is claimed is:

1. An electronic display, comprising:
a display panel comprising a plurality of display pixels;
a scan driver communicatively coupled to the plurality of display pixels;
a data driver communicatively coupled to the plurality of display pixels; and
a controller communicatively coupled to the scan driver and the data driver, wherein the controller is configured to:
instruct the scan driver and the data driver to program a row of the plurality of display pixels based on corresponding image data;
instruct the scan driver to turn on the row of the plurality of display pixels at a fixed time after programming the row of the plurality of display pixels;
instruct the scan driver to turn off the row of the plurality of display pixels based at least in part on a first luminance of the row of the plurality of display pixels; and
instruct the scan driver and the data driver to reset the row of the plurality of display pixels to overwrite previous image data stored in the row of the plurality of display pixels by programming each display pixel in the display pixel row with a reset voltage in response to turning off the display pixel row to reduce hysteresis in the row of the plurality of display pixels.

2. The electronic display of claim 1 , wherein, to program the row of the plurality of display pixels, the controller is configured to: instruct the data driver to provide first data signals based at least in part on the first luminance indicated by the corresponding image data; and instruct the scan driver to generate a first scan control signal that instructs each display pixel in the row of the plurality of display pixels to supply one of the first data signals to its storage component.

3. The electronic display of claim 2 , wherein the storage component comprises a transistor, a capacitor, or both.

4. The electronic display of claim 2 , wherein, to turn on the row of the plurality of display pixels the controller is configured to instruct the scan driver to output an emission on control signal that instructs each display pixel in the row of the plurality of display pixels to connect a current source programmed based on the image data to its light emitting device.

5. The electronic display of claim 4 , wherein the light emitting device comprise an organic light emitting diode.

6. The electronic display of claim 4 , wherein, to turn off the row of the plurality of display pixels the controller is configured to instruct the scan driver to output an emission off control signal that instruct each display pixel in the row of the plurality of display pixels to disconnect a current source programmed based on the image from its light emitting device.

7. The electronic display of claim 2 , wherein, to reset the row of the plurality of display pixels the controller is configured to instruct the scan driver to generate a second scan control signal that instructs each display pixel in the row of the plurality of display pixels to use a data signal different from the first data signals.

8. A method for operating an electronic display, comprising:
receiving image data into display driver circuitry of the electronic display;
programming a display pixel of the electronic display based on the image data using the display driver circuitry;
sending a first signal configured to cause the display pixel to emit light using the display driver circuitry;
sending a second signal configured to cause the display pixel to stop emitting light based on a first luminance of the image data using the display driver circuitry; and
applying a reset voltage configured to reset the display pixel to overwrite previous image data stored in the display pixel using the display driver circuitry to reduce hysteresis in the display pixel.

9. The method of claim 8 , comprising initializing the display pixel by applying an initial voltage using the display driver circuitry.

10. The method of claim 8 , comprising determining a duration between the first signal and the second signal based on the first luminance.

11. The method of claim 8 , comprising programming a different display pixel based on the image data, after causing the display pixel to emit light.

12. The method of claim 8 , comprising sending a third signal configured to cause a different display pixel to emit light after sending the second signal.

13. The method of claim 8 , comprising sending a third signal to a different display pixel to stop emitting light, after programming the display pixel.

14. The method of claim 8 , wherein:
sending the first signal is associated with a frame of the image data;
sending the second signal is associated with the frame of the image data; and
sending the first signal occurs before sending the second signal.

15. An electronic device comprising:
one or more processors configured to generate image data; and
an electronic display configured to display the image data over a first frame duration at least in part by:
programming a first row of display pixels with the image data;
causing the first row of display pixels to emit light for an emission duration that is based at least in part on a first luminance of the image data; and
resetting the first row of display pixels before an end of the first frame duration to overwrite previous image data stored in the first row of display pixels and reduce hysteresis in the first row of display pixels.

16. The electronic device of claim 15 , wherein the electronic display is configured to display the image data over the first frame duration at least in part by initializing the first row of display pixels by applying an initial voltage to the first row of display pixels.

17. The electronic device of claim 15 , wherein the electronic display is configured to display the image data over the first frame duration at least in part by programming a second row of display pixels with the image data, after causing the first row of display pixels to emit light.

18. The electronic device of claim 15 , wherein the electronic display is configured to display the image data over the first frame duration at least in part by causing the first row of display pixels to stop emitting light after the emission duration.

19. The electronic device of claim 18 , wherein the electronic display is configured to display the image data over the first frame duration at least in part by causing a second row of display pixels to emit light, after causing the first row of display pixels to stop emitting light after the emission duration.

20. The electronic device of claim 15 , wherein the electronic display is configured to display the image data over the first frame duration at least in part by causing a second row of display pixels to stop emitting light, after programming the first row of display pixels with the image data.

Assignees

• Apple Inc

Inventors

• Lin Hung Sheng
• Jangda Mohammad Ali
• Hwang Injae
• Zhang Rui
• Gao Shengkui
• Nho Hyunwoo
• Yao Wei H
• Hajirostam Mohammad

Classifications

• G09G2310/0251

  Precharge or discharge of pixel before applying new pixel voltage · CPC title

• G09G2320/064

  by time modulation of the brightness of the illumination source · CPC title

• G09G2300/0861

  with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes · CPC title

• G09G2320/0257

  Reduction of after-image effects · CPC title

• G09G3/3266 Primary

  Details of drivers for scan electrodes · CPC title