Method and apparatus for controlling an active matrix display

An apparatus for controlling an active matrix display including an array of pixels arranged in a plurality of rows and a plurality of columns, each pixel element including an active matrix element, the apparatus comprising:

• a sensor array arranged in a plurality of rows and a plurality of columns, each sensor having a measurable sensor parameter and positioned to receive at least a portion of the radiation emitted from at least one of the pixels;
• a row selector coupled to the sensor array and coupleable to the display operable to select at least one of the plurality of rows;
• and
• a plurality of control units, each coupled to a plurality of the sensors located in a common column and a reference signal indicative of a target value of the measurable sensor parameter for a pixel in the selected row, the control unit operable to compare a measured value of the sensor parameter with the reference signal and generate a control signal, the control unit further coupled to the active matrix elements such that the active matrix elements receive the control signal and maintain the amount of radiation emitted from the light source.

A controlled active matrix display, comprising:

• an array of pixels arranged in a plurality of rows and a plurality of columns, each pixel element including an active pixel element configured to drive the pixel;
• a sensor array arranged in the plurality of rows and the plurality of columns, each sensor having a measurable sensor parameter and positioned to receive at least a portion of the radiation emitted from at least one of the pixels;
• a row selector coupled to the sensor array and the array of pixels and operable to select at least one of the plurality of rows;
• a plurality of control units, each coupled to a plurality of the sensors located in a common column and a reference signal indicative of a target value of the measurable sensor parameter for a pixel in the selected row, the control unit operable to compare a measured value of the sensor parameter with the reference signal and generate a control signal;
• and
• a pixel driver coupled to the active matrix elements, the pixel driver coupled to the active matrix elements and operable to vary an amount of radiation emitted from at least one pixel, the active matrix elements operable to receive the control signal and maintain the amount of radiation emitted from the pixel.