Patent ID: 8629831
Filing Date: 2014-01-14
Classification: G09G

Abstract:
1. A local-dimming control method for controlling of a driving of a light source module, where the light source module is used to provide backlighting light to an adjacent display panel also provided in a display device that includes the light source module, the display panel having blocks of pixels each containing a respective plurality of pixels with respective pixel areas where the pixels define a resolution of an image produced by the display device, where the display device is configured to operate in a localized dimming mode, where the light source module comprises a plurality of independently controllable light-emitting blocks each corresponding to a respective one of the blocks of pixels of the display panel, at least one of the light-emitting blocks comprising a plurality of different sets of light sources, each respective set of light sources within a respective at least one of the blocks being configured to provide a respective color of sourced light among different sourced colors and each respective set having a correspondingly colored one or more light sources, the different sets of light-sources being independently controllable according to one or more driving parameters to allow each at least one of the light-emitting blocks to be driven to provide first intensities of differently colored source lights during a first time duration in which the display device is displaying an image in accordance with a first localized color-dimming process, wherein during said first time duration, each at least one of the light-emitting blocks' output chromaticity and luminance depend on a corresponding image block in the image then being displayed by the display device, the local-dimming control method comprising: (a) in at least one of plural repetitions of the first time duration, driving each said at least one of the light-emitting blocks to provide backlighting light to its corresponding one of the blocks of pixels of the display panel in accordance with the first color-dimming process; (b) in at least one of plural repetitions of second time durations interposed between the first time durations, where during said second time durations the display device is not operating in accordance with a color-dimming process, driving each at least one of the said light-emitting blocks in accordance with a full-color process wherein the at least one light-emitting blocks are driven by reference-determined drive signals which are independent of the image to be then displayed by the display device; (c) in at least one of said second time durations and while driving each said at least one of the light-emitting blocks by the full-color process, sensing light emitted by at least one of the light sources, and based on the sensing, determining what respective level of reference-determined drive signal or signals are needed to achieve a predetermined luminance and chromaticity output from the at least one of the light sources that is sensed; (d) in at least one of the first and second time durations, using the determined level or levels of respective reference-determined drive signal or signals for driving at least one of said light-emitting blocks; and (e) between at least one of the first and second time durations, gradually switching operation of the light-source module between a state in which the luminance of each at least one of said light-emitting blocks is determined by the first color-dimming process and a state in which the luminance of each at least one of said light-emitting blocks is determined by the full-color process.