Power management for modulated backlights

摘要

Power levels of a backlight are adjusted in a number of ways and based on a number of criteria. The adjustments result in a lower power consumption and, in some cases, may enhance audience attention to important objects in a scene. The adjustments comprise, for example, a combination of ramping down power (lowering final display brightness) in concert with corresponding compensatory LCD adjustments (increasing final display brightness). The adjustments may also include, for example, system dimming after ramp down/LCD adjustments are exhausted, or the shifting of an LDR2HDR curve.

主权项

1. A display, comprising:
a premodulator device including a plurality of individually controllable light sources and being configured to produce a first modulated light according to an image to be displayed, each of the individually controllable light sources being associated with at least one of a plurality of regions of the image to be displayed; a primary modulator device illuminated by the first modulated light and configured to further modulate the first modulated light to produce further modulated light carrying the image to be displayed; and a controller coupled to the premodulator device and the primary modulator device, the controller being configured
to evaluate image data representative of the image to be displayed to determine power information associated with each of the regions,to compare the power information to a maximum threshold power value, andwhen the power information indicates an exceedance of the maximum threshold power value for a particular region, to simultaneously calculate and implement a change in brightness of an area of the first modulated light associated with the particular region and a change in modulation by the primary modulator device so as to maintain brightness levels of the image to be displayed consistent with the image data, andwherein at least one region of the image to be displayed is adjusted in brightness relatively more or less than other regions of the image to be displayed.