Local-dimming method, light source apparatus performing the local-dimming method and display apparatus having the light source apparatus
First Claim
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.
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Accused Products
Abstract
A light source module of a display device comprises light-emitting blocks each of which comprises multiple sets of light sources, with different sets emitting different colors (e.g. red, green and blue). Each set is independently controllable according to one or more driving parameters. A local-dimming method comprises: (a) in each color-dimming period, driving each light-emitting block by the first color-dimming process; (b) in each compensating period, driving each light-emitting block by a full-color process which is independent of the image; (c) in each compensating period, sensing emitted light and determining the one or more driving parameters'"'"' reference driving values operable to generate a reference color; (d) in at least one of the color-dimming and compensating periods, driving each light-emitting block using the one or more driving parameters'"'"' values which depend on the reference driving values; and (e) between a color-dimming period and an adjacent compensating period, gradually switching the light-source module between the first color-dimming process and the full-color process.
19 Citations
22 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A light source apparatus, where the light source apparatus is configured for providing backlighting light to an adjacent display panel of a display device that includes the light source apparatus, 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, the light source apparatus comprising:
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a light source module that is configured to operate in a localized dimming mode, the light source module comprising a plurality of light-emitting blocks each corresponding to a respective one of the blocks of pixels of the display panel and each being independently controllable to provide correspondingly controlled backlighting light to its respective block of pixels, 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 light-emitting 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, each set of light-sources being associated with respective one or more driving parameters determining an input power provided to each light-source of the set to allow each corresponding at least one of the light-emitting blocks to be driven in accordance with a first localized color-dimming process in which each at least one light-emitting block'"'"'s output chromaticity and luminance depend on a corresponding image block in the image then being displayed by the display device; and a local-dimming driving part configured to provide the one or more driving parameters to the sets of the light-sources, the local-dimming part comprising a light sensing part configured to sense light emitted by the light source module and comprising circuitry for carrying out a process wherein; (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 said at least one of the light-emitting blocks in accordance with a full-color process wherein the at least one of the 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 each said at least one of the 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 said at least one of the light-emitting blocks is determined by the first color-dimming process and a state in which the luminance of each said light-emitting block is determined by the full-color process. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A display apparatus comprising:
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a display panel configured for displaying an image that is partitionable into corresponding image blocks, the display panel having blocks of pixels each corresponding to a respective image block and 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; a light source module that is configured to operate in a localized dimming mode, the light source module including a plurality of light-emitting blocks each corresponding to a respective one of the blocks of pixels of the display panel and each being independently controllable to provide correspondingly controlled backlighting light to its respective block of pixels, at least one of the light-emitting blocks including a plurality of differently colored, color light sources; and a local-dimming driving part configured for driving the light source module in accordance with a first localized color-dimming process using color-dimming levels determined based on a corresponding image block in the image then being displayed by the display device, where each corresponding image block corresponds to a respective one of the at least one of the light-emitting blocks, the local-dimming driving part being also configured for adjusting the light emitted by the color light sources in a full-color process during a compensating period, and for driving the at least one of the light-emitting blocks to have to gradually change the total luminance of the at least one of the light-emitting blocks during transitions between a state in which all the at least one light-emitting blocks are driven by the first color-dimming process and a state in which all the at least one light-emitting blocks are driven by the full-color process. - View Dependent Claims (21, 22)
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Specification