Control method for a display apparatus and display apparatus
AssigneeOSRAM Opto Semiconductors GmbH
InventorsDaniel Richter, Marcel Severin
Life of this patent
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Abstract
A control method includes A) determining intrinsic activation times of individual semiconductor emitters of a display device. The display device includes a plurality of light-emitting semiconductor emitters with different intrinsic activation times. The method also includes B) determining and storing in each case an activation delay and/or a turn-on current change for each individual one of the semiconductor emitters. The method further includes C) energizing the individual semiconductor emitters according to the previously determined activation delay and/or turn-on current change, so that in a display mode of the display device the semiconductor emitters have equally long starting times for a light emission.
Claims16
A control method for a display device, which comprises a plurality of light-emitting semiconductor emitters with different intrinsic activation times, wherein the method comprises:
- A) determining the intrinsic activation times of the individual semiconductor emitters,
- B) determining and storing in each case an activation delay and/or a turn-on current change for each individual one of the semiconductor emitters, and
- C) energizing the individual semiconductor emitters according to the previously determined activation delay and/or turn-on current change, so that in a display mode of the display device the semiconductor emitters have equally long starting times for a light emission, wherein
- the display device has at least one group with N semiconductor emitters,
- the display device is controlled at a clock frequency,
- the individual activation delays for the N semiconductor emitters are Ki times of a clock time of the clock frequency, and these semiconductor emitters are numbered with i, where i∈[1;
- N]N and all Ki∈N0, and
- for at least one of the semiconductor emitters it applies that Ki≠0.
A control method for a display device, which comprises a plurality of light-emitting semiconductor emitters with different intrinsic activation times, wherein the method comprises:
- A) determining the intrinsic activation times of the individual semiconductor emitters,
- B) determining and storing in each case an activation delay and/or a turn-on current change for each individual one of the semiconductor emitters, and
- C) energizing the individual semiconductor emitters according to the previously determined activation delay and/or turn-on current change, so that in a display mode of the display device the semiconductor emitters have equally long starting times for a light emission,
- wherein the semiconductor emitters are energized with a target current intensity after a switch-on phase,
- wherein during the switch-on phase, the target current intensity for the individual semiconductor emitters is increased or decreased at least temporarily by the associated turn-on current change, and
- wherein the turn-on current changes are each at most 50% of the target current intensity.
A control method for a display device, which comprises a plurality of light-emitting semiconductor emitters with different intrinsic activation times, wherein the method comprises:
- A) determining the intrinsic activation times of the individual semiconductor emitters,
- B) determining and storing in each case an activation delay and/or a turn-on current change for each individual one of the semiconductor emitters, and
- C) energizing the individual semiconductor emitters according to the previously determined activation delay and/or turn-on current change, so that in a display mode of the display device the semiconductor emitters have equally long starting times for a light emission,
- wherein in step B) the activation delays and/or the turn-on current changes for the individual semiconductor emitters are determined by a measurement of a time-voltage curve at a power supply of the respective semiconductor emitter, and
- wherein the semiconductor emitters are operated with a precharge function such that a precharge voltage is present at the power supply before switching on the respective semiconductor emitter, which precharge voltage is greater than a forward voltage of said semiconductor emitter.
Dependencies are inferred from the claim text.