Patent application number | Description | Published |
20090102783 | Adaptive Smoothing of Backlight to Reduce Flicker - A method and apparatus for adaptively controlling the backlight to reduce flicker in a display is provided. The apparatus includes a display, a backlight providing illumination for said display, a backlight control module for providing backlight control signals to said backlight, and an adaptive transition rate module. The module calculates an adaptive parameter based on a magnitude of change between backlight requirements for two frames, determining a smoothing function based on the adaptive parameter, and using said smoothing function to modify said backlight control signals. Techniques for adaptively controlling the illumination of the backlight according to the difference in the illumination levels of two different sets of image data are also disclosed. | 04-23-2009 |
20090122073 | GAMUT MAPPING AND SUBPIXEL RENDERING SYSTEMS AND METHODS - In a first embodiment, a display system comprises a display panel with 4 or more colored subpixels. The display system receives input image data specified in a first color space and outputs image data specified in a second color space. The display system further comprises a gamut mapping module for mapping the input image data specified in the first color space to image data specified in the second color space. The gamut mapping module clamps out-of-gamut colors using at least a first clamping system and a second clamping system. The first and second clamping systems yield first and second clamped values. A weighting module produces a resulting clamped value from the first and second clamped values. A final output image value is derived from the resulting clamped value. Other embodiments of the display system include pre-reduction modules and adjustable GMA modules. | 05-14-2009 |
20090273614 | GAMUT MAPPING AND SUBPIXEL RENDERING SYSTEMS AND METHODS - In a first embodiment, a display system comprises a display panel with 4 or more colored subpixels. The display system receives input image data specified in a first color space and outputs image data specified in a second color space. The display system further comprises a gamut mapping module for mapping the input image data specified in the first color space to image data specified in the second color space. The gamut mapping module clamps out-of-gamut colors using at least a first clamping system and a second clamping system. The first and second clamping systems yield first and second clamped values. A weighting module produces a resulting clamped value from the first and second clamped values. A final output image value is derived from the resulting clamped value. Other embodiments of the display system include pre-reduction modules and adjustable GMA modules. | 11-05-2009 |
20090278867 | MULTIPRIMARY COLOR DISPLAY WITH DYNAMIC GAMUT MAPPING - The embodiments disclosed herein comprise a plurality of modules and means to provide effect dynamic gamut mapping and backlight control. In one embodiment, a display system comprises: a transmissive display, said display comprising a plurality of colored subpixels wherein one such colored subpixel is substantially wide spectrum bandpass; a transmissive display controller, said display controller providing signals to said transmissive display to set the amount of transmissivity of each said colored subpixel; a backlight, said backlight providing illumination to said transmissive display; a backlight controller, said controller providing signals to said backlight to modulate the amount of illumination provided by said backlight to said transmissive display; peak surveying module for surveying image data and extracting the image gamut hull for providing intermediate backlight data signals to said backlight controller to match said image gamut hull; and a means for normalizing display image data signals according to said intermediate backlight data signals and providing said normalized image data as intermediate display data. | 11-12-2009 |
20090284457 | HISTOGRAM-BASED DYNAMIC BACKLIGHT CONTROL SYSTEMS AND METHODS - Displays systems and methods for adjusting backlight illumination are disclosed wherein backlight illumination may be set low enough according to an error threshold amount in order to reduce backlight power consumption while maintaining a level of image quality. In one embodiment, image data is evaluated within a given frame and partitioned into histogram bins depending on the amount of backlight illumination requested or required by the image data. The histogram is traversed to provide an accumulative error measure. The error measure is compared against the error threshold and, if exceeded, the final backlight illumination may be set as a function of various illumination levels considered and possibly the first and a second threshold. | 11-19-2009 |
20090284540 | POST-COLOR SPACE CONVERSION PROCESSING SYSTEM AND METHODS - Displays systems and methods for producing a single scaling factor to image data values are disclosed. In one embodiment of a display system uses a post-scaling module. A post-scaling unit for scaling image data values is constructed as a function of many scaling requirements such as backlight illumination from said illumination determination unit, saturation of the image data values and out-of-gamut correction—to produce a single scaling factor. This single scaling factor may be a function of a number of scaling requirements as described herein. Some of these scaling requirements could be selected from a group scaling considerations, such as saturation based scaling, out-of-gamut scaling, and non-linear scaling. Of course, other scaling requirements may be desired and could be added as such. As further described herein, the non-linear scale module could be used to enhance dark color values and may depend on the luminance value of image data values. Once these scaling requirements are determined, there are a multitude of ways of combining them to create such a single scaling factor—including multiplying them or taking the minimum of them or a combination thereof. | 11-19-2009 |
20110025592 | BACKLIGHT LEVEL SELECTION FOR DISPLAY DEVICES - Display systems and methods for adjusting backlight illumination are disclosed for selecting a backlight illumination level that is low enough to reduce backlight power consumption while maintaining a desired level of image quality. The method 1) determines the peak illumination level requested by a frame to satisfy all pixels in a frame, 2) determines a histogram-based statistical illumination value for the frame, and 3) selects the lower of the two values. The histogram-based statistical illumination value is calculated using an error function for different ranges of illumination levels, wherein the error function correlates with luminance error introduced by selecting next lower range of illumination levels. | 02-03-2011 |
20110043533 | SUPBIXEL RENDERING SUITABLE FOR UPDATING AN IMAGE WITH A NEW PORTION - In an image update, a display apparatus receives only a new portion ( | 02-24-2011 |
20110141132 | GAMUT MAPPING AND SUBPIXEL RENDERING SYSTEMS AND METHODS - In a first embodiment, a display system comprises a display panel with 4 or more colored subpixels. The display system receives input image data specified in a first color space and outputs image data specified in a second color space. The display system further comprises a gamut mapping module for mapping the input image data specified in the first color space to image data specified in the second color space. The gamut mapping module clamps out-of-gamut colors using at least a first clamping system and a second clamping system. The first and second clamping systems yield first and second clamped values. A weighting module produces a resulting clamped value from the first and second clamped values. A final output image value is derived from the resulting clamped value. Other embodiments of the display system include pre-reduction modules and adjustable GMA modules. | 06-16-2011 |
20110148910 | COLOR CORRECTION TO COMPENSATE FOR DISPLAYS' LUMINANCE AND CHROMINANCE TRANSFER CHARACTERISTICS - Displays are provided with circuitry performing color correction to compensate for the displays' luminance and chrominance transfer characteristics. Some techniques are suitable for RGBW displays and for subpixel-rendered displays. Some displays include an external light source (e.g. a backlight unit in LCDs), and the color correction is coordinated with dynamic control of the light source. | 06-23-2011 |
20110149166 | COLOR CORRECTION TO COMPENSATE FOR DISPLAYS' LUMINANCE AND CHROMINANCE TRANSFER CHARACTERISTICS - Displays are provided with circuitry performing color correction to compensate for the displays' luminance and chrominance transfer characteristics. Some techniques are suitable for RGBW displays and for subpixel-rendered displays. Some displays include an external light source (e.g. a backlight unit in LCDs), and the color correction is coordinated with dynamic control of the light source. | 06-23-2011 |
20120182306 | GAMUT MAPPING AND SUBPIXEL RENDERING SYSTEMS AND METHODS - In a first embodiment, a display system comprises a display panel with 4 or more colored subpixels. The display system receives input image data specified in a first color space and outputs image data specified in a second color space. The display system further comprises a gamut mapping module for mapping the input image data specified in the first color space to image data specified in the second color space. The gamut mapping module clamps out-of-gamut colors using at least a first clamping system and a second clamping system. The first and second clamping systems yield first and second clamped values. A weighting module produces a resulting clamped value from the first and second clamped values. A final output image value is derived from the resulting clamped value. Other embodiments of the display system include pre-reduction modules and adjustable GMA modules. | 07-19-2012 |
20120249574 | METHOD AND APPARATUS FOR REDUCED GATE COUNT GAMMA CORRECTION - A cubic, or other polynomial, approximation to a panel's gamma function. Embodiments contemplate a display system configured to apply a panel gamma function that is a third-order polynomial function, as well as its substantial inverse. This third order function is often easier to implement, and yields lower gate count than current power law gamma functions. | 10-04-2012 |
20120287146 | METHOD FOR SELECTING BACKLIGHT COLOR VALUES - A method of facilitating the display of an image. The method includes, in a display system comprising a display panel having pixels and a backlight having individually addressable colored light emitters configured to provide light to the pixels of the display panel, receiving image data corresponding to an image for display upon the display panel, the pixels each having a color to be displayed, so as to collectively display the image. The method also includes, for each pixel, evaluating whether the corresponding color to be displayed is out-of-gamut to the each pixel, so as to form a set of out-of-gamut pixels. A set of virtual primaries is determined so as to define intensities of light emitted by the colored light emitters of the backlight during display of the image, the virtual primaries determined according to the colors of the set of out-of-gamut pixels. | 11-15-2012 |
20120287167 | LOCAL DIMMING DISPLAY ARCHITECTURE WHICH ACCOMMODATES IRREGULAR BACKLIGHTS - A display system and method for displaying an image on the display system are provided. The display system includes a display panel and a backlight for illuminating the display panel, the backlight including one or more light emitting zones that each emit light in response to a backlight drive value. The display system further includes a backlight selection module for selecting the backlight drive value for each light emitting zone from image data, an effective backlight module that generates effective backlight signals using light spread information for the backlight and the backlight drive values, and a module for modulating the image data according to the effective backlight signal and providing the modulated image data to the display panel. The light spread information includes information representing the contribution of light from each light emitting zone over the display panel. | 11-15-2012 |
20120287168 | APPARATUS FOR SELECTING BACKLIGHT COLOR VALUES - One embodiment may employ one or more non-transitory computer-readable memories, the memories collectively storing instructions for executing a method of facilitating the display of an image. This method may comprise, in a display system comprising a display panel having pixels and a backlight having individually addressable colored light emitters configured to provide light to the pixels of the display panel, receiving image data corresponding to an image for display upon the display panel, the pixels each having a color to be displayed, so as to collectively display the image. The method also includes, for each pixel, evaluating whether the corresponding color to be displayed is out-of-gamut to the each pixel, so as to form a set of out-of-gamut pixels. A set of virtual primaries is determined, defining intensities of light emitted by the colored light emitters of the backlight during display of the image, the virtual primaries determined according to the colors of the set of out-of-gamut pixels. | 11-15-2012 |
20120287182 | OPTIMIZATION OF LIGHT SOURCE DRIVE VALUES IN BACKLIGHT SYSTEMS - A method of optimizing the luminance level of a backlight system is presented. The method entails dividing the backlight system into zones, each of the zones having a light source; determining a target illumination level for each of the zones based on data values of a display panel that is to be illuminated by the backlight system; and setting a backlight drive value of the light source in a particular zone based on target illumination level of the particular zone and a backlight drive value assigned to its neighboring zone. The invention makes high-quality image display achievable with reduced power consumption by taking advantage of the “communal” aspect of the zones in a local dimming backlight system. In determining the backlight drive value of a zone, the invention takes into account the illumination contributions from neighboring zones. | 11-15-2012 |
20120327144 | GAMUT MAPPING AND SUBPIXEL RENDERING SYSTEMS AND METHODS - In a first embodiment, a display system comprises a display panel with 4 or more colored subpixels. The display system receives input image data specified in a first color space and outputs image data specified in a second color space. The display system further comprises a gamut mapping module for mapping the input image data specified in the first color space to image data specified in the second color space. The gamut mapping module clamps out-of-gamut colors using at least a first clamping system and a second clamping system. The first and second clamping systems yield first and second clamped values. A weighting module produces a resulting clamped value from the first and second clamped values. A final output image value is derived from the resulting clamped value. Other embodiments of the display system include pre-reduction modules and adjustable GMA modules. | 12-27-2012 |
20130147824 | METHODS FOR MODIFYING COLOR DATA AND DISPLAY SYSTEMS IMPLEMENTING THE METHODS - A method for modifying color data in a display system is implemented using hardware circuitry. The method includes receiving first-color data associated with a first bit depth, the first-color data including a first-color data value. The method also includes receiving second-color data associated with a second bit depth that is less than the first bit depth, the second-color data including a second-color data value that corresponds to the first-color data value. The method also includes normalizing the second-color data according to the first bit depth for generating normalized second-color data. The method also includes adding an offset value to each data value of the normalized second-color data to generate offset second-color data, the offset second-color data including an offset second-color data value that corresponds to the first-color data value. The method also includes determining a modified second-color data value using the first-color data value and the offset second-color data value. | 06-13-2013 |
20130215360 | METHOD FOR REDUCING SIMULTANEOUS CONTRAST ERROR - Facilitating the display of an image in a display system comprising a display panel having sub-pixels, and a backlight having individually addressable colored light emitters configured to provide light to the sub-pixels. From received image data, sub-pixel color values corresponding to color values transmitted by respective ones of the sub-pixels for display of the image are determined. From the image data, backlight values corresponding to brightnesses of ones of the colored light emitters for display of the image are determined, as are a portion of the sub-pixel color values and a portion of the backlight values that collectively correspond to a saturated or near-saturated yellow color in the displayed image. The backlight values are adjusted by increasing an amount of yellow light to be emitted by emitters of the backlight, and the color values are adjusted by decreasing an amount of yellow light to be transmitted by the sub-pixels. | 08-22-2013 |
20130321476 | DEVICES AND METHODS FOR PROCESSING IMAGE DATA - A module processes image data to provide gray level signals to be used for displaying an image. The module may include a scale value control member for determining a first scale value. The module may further include a brightness control member for determining a controlled brightness value using a requested brightness value, a brightness control parameter, and a baseline brightness value. The module may further include a modification member for determining a modified scale value using the first scale value and the controlled brightness value. The module may further include a scaler for generating the gray level signals using the image data and at least one of the modified scale value and a damped scale value, the damped scale value being determined using the modified scale value. The module may further include hardware circuitry for implementing at least one of the aforementioned components. | 12-05-2013 |