| 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 |
