REDUNDANT OPERATION OF A BACKLIGHT UNIT OF A DISPLAY DEVICE UNDER OPEN CIRCUIT OR SHORT CIRCUIT LED STRING CONDITIONS AND INCLUDING DYNAMIC PHASE SHIFTING BETWEEN LED STRINGS

摘要

Disclosed embodiments relate to techniques for operating a backlight unit of a display device in a redundant mode and a non-redundant mode in the event of an open circuit condition or short string condition. For instance, in a redundant mode, multiple LED strings are driven to provide a first quantity of light, such that the combined output from all LED strings is capable of providing a total light output corresponding to a maximum brightness setting for the display device. In the case that one of the LED strings fails due to an open circuit condition or short string condition, the remaining LED strings may be driven to provide a second quantity of light that is greater than the first, such that the combined light output from the remaining LED strings provides the same total light output for achieving the maximum brightness setting. Further, if the LED strings are operated in a phase-shifted manner, the phase shift between the remaining LED strings may be dynamically adjusted to keep the phase shift substantially equal between the LED strings.