Control of an electroluminescent display
AssigneeSTMicroelectronics S.r.l.
InventorsCéline Mas, Corinne Ianigro, Hervé Pierrot
Life of this patent
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Abstract
A device for controlling an electroluminescent matrix display by successive selection of its lines, including a column control circuit having circuitry capable of placing, at the beginning of the selection of a line, the display column at a precharge voltage based on the operating voltage of the previous line, the column control circuit also having circuitry capable of modifying the precharge voltage according to the difference between luminance instructions of the previous line and those of the selected line.
Claims23
A device for controlling an electroluminescent matrix display by successive selection of its lines, comprising a column control circuit comprising a precharge circuit configured to place, at a beginning of the selection of a line, the display columns at a precharge voltage based on the operating voltage of the previous line, wherein the column control circuit also comprises an offset voltage generator configured to modify the precharge voltage according to a difference between luminance instructions of a previous line and those of the selected line, the device further comprising a comparison circuit configured to compare the luminance instructions for each pixel of the selected line with the luminance instructions for each pixel of the previous line and to provide a result for each pixel of the selected line, and a combination circuit configured to combine the results for each pixel and to provide an offset value to the offset voltage generator.
A method of line-by-line control of a matrix display comprising light-emitting diodes arranged at the intersection of lines and columns, comprising, at the beginning of the selection a line, a step of line precharge based on the operating voltage of a previous line, wherein the step of precharge of the selected line is preceded by determining a difference between the luminance conditions of each pixel of the selected line and the luminance conditions of each pixel of the previous line and providing a result for each pixel of the selected line, combining the results to provide an ofset value, and modifying the precharge according to the offset value.
A circuit for controlling a matrix display including light-emitting diodes at intersections of lines and columns of the display, comprising:
- a detection circuit configured to determine a difference in luminance conditions between a selected line of the display and a previous line of the display, wherein the detection circuit includes a comparison circuit configured to compare luminance instructions for each pixel of the selected line with luminance instructions for each pixel of the previous line and to provide a result for each pixel of the selected line, and a combination circuit configured to combine the results and provide an offset value;
- and
- a column control circuit configured to supply a precharge quantity to columns of the selected line, the column control circuit including an offset circuit configured to modify the precharge quantity of the selected line of the display based at least in part on the offset value.
A method for controlling a matrix display including light-emitting diodes at intersections of lines and columns of the display, comprising:
- determining, by a detection circuit, a difference in luminance conditions between a selected line of the display and a previous line of the display, wherein determining the difference in luminance conditions includes comparing luminance instructions for each pixel of the selected line with luminance instructions for each pixel of the previous line, and combining the results of each comparison to provide an offset value;
- and
- supplying, by a column control circuit, a precharge quantity to columns of the selected line, including modifying the precharge quantity of the selected line of the display based at least in part on the offset value.
Dependencies are inferred from the claim text.