Method of sensing voltage for precharge
First Claim
1. A method of charging an element in a display, the method comprising:
- determining a steady state voltage of at least one of a plurality of elements in a display;
applying a precharge voltage across one of the elements in the display, wherein the precharge voltage is based at least in part upon the determined steady state voltage; and
driving a current through the element, wherein driving current causes the illumination of at least a portion of the display.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus to calibrate an LED matrix display such that a driver will provide a proper precharge voltage to LED elements within the display during a scan period. A current is driven through a calibration element, and a voltage reflecting the steady-state element voltage is measured and stored as a calibration value. A processor controls whether to precharge during the calibration cycle, and determines when the calibration cycle is completed. During subsequent normal scans, a driver applies a voltage based on the stored calibration value to rapidly precharge parasitic capacitance associated with a display element to a proper value, and also drives a selected current through the device.
84 Citations
30 Claims
-
1. A method of charging an element in a display, the method comprising:
-
determining a steady state voltage of at least one of a plurality of elements in a display;
applying a precharge voltage across one of the elements in the display, wherein the precharge voltage is based at least in part upon the determined steady state voltage; and
driving a current through the element, wherein driving current causes the illumination of at least a portion of the display. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method of charging an element in a display, the method comprising:
-
determining a first voltage;
applying a second voltage across an element in the display, wherein the second voltage is based at least in part upon the determined first voltage; and
driving a current through the element. - View Dependent Claims (8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
-
-
13. A system for charging an element in a display, the method comprising:
-
means for determining a voltage;
means for applying the determined voltage across at least an element in the display; and
means for driving a current through the element.
-
-
19. A method of manufacturing a display device having at least one display element which includes first and second terminal regions, the method comprising:
-
electrically connecting a driver circuit to the first terminal region of the display element, the driver circuit configured to cause a current to flow through the display element and generate a steady state voltage;
electrically connecting a sensing circuit to the first terminal region, the sensing circuit configured to generate a representation of a conduction voltage created when the display device conducts a known current; and
electrically connecting a storage device to the sensing circuit, the storage device configured to store the steady state voltage representation and retrieve the steady state voltage representation during the non-calibration mode of operation.
-
Specification