Device and method for operating a self-calibrating emissive pixel
First Claim
1. A method for operating a self-calibrating pixel, the method comprising:
- establishing a sensor capacitor at a predetermined starting voltage;
delivering a current to a photon emitting device to cause photons to be emitted at a predetermined target photon emission level;
exposing a sensor device, having electrical properties that varies according to a photon flux on the sensor device, to the emitted photon emission during at least a portion of a display frame time;
permitting the sensor capacitor to either charge or discharge from the predetermined starting voltage through the sensor device so that the portion of the frame time and the average resistance of the sensor during the portion of the frame time determine the amount of charge on the sensor capacitor;
measuring the voltage or charge remaining on the sensor capacitor at the end of a portion of the frame time as an indication of the integrated photon flux and pixel luminance during the portion of the frame time used for measurement; and
modifying the image voltage and current to be applied to the same pixel and gray level during a subsequent display frame time using the measured sensor capacitor voltage as a feedback parameter.
2 Assignments
0 Petitions
Accused Products
Abstract
Self-calibrating emissive pixel circuit, device and method for operating pixel. Method for operating includes: establishing sensor capacitor at predetermined starting voltage, delivering current to photon emitting device to cause photons to be emitted at predetermined target photon emission level, exposing sensor having electrical properties that vary according to photon flux on sensor to the emitted photon emission during at least portion of display frame time, permitting sensor capacitor to either charge or discharge from predetermined starting state through the sensor so that portion of frame time and resistance of sensor during portion of frame time determine amount of charge on sensor capacitor, measuring voltage or charge remaining on sensor capacitor at end of portion of frame time as indication of integrated photon flux and pixel luminance, and modifying image voltage and/or current applied to pixel during any subsequent display frame time using measured voltage as feedback parameter.
111 Citations
22 Claims
-
1. A method for operating a self-calibrating pixel, the method comprising:
-
establishing a sensor capacitor at a predetermined starting voltage;
delivering a current to a photon emitting device to cause photons to be emitted at a predetermined target photon emission level;
exposing a sensor device, having electrical properties that varies according to a photon flux on the sensor device, to the emitted photon emission during at least a portion of a display frame time;
permitting the sensor capacitor to either charge or discharge from the predetermined starting voltage through the sensor device so that the portion of the frame time and the average resistance of the sensor during the portion of the frame time determine the amount of charge on the sensor capacitor;
measuring the voltage or charge remaining on the sensor capacitor at the end of a portion of the frame time as an indication of the integrated photon flux and pixel luminance during the portion of the frame time used for measurement; and
modifying the image voltage and current to be applied to the same pixel and gray level during a subsequent display frame time using the measured sensor capacitor voltage as a feedback parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
Specification