Patent application number | Description | Published |
20080297451 | Methods and apparatuses for increasing the apparent brightness of a display - Methods and apparatuses to varying the apparent brightness of a display are described. The change in apparent brightness is accompanied by unchanged in relative contrast, rendering a display with higher or lower brightness while maintaining contrast fidelity. In exemplary embodiments, the signals for the middle tone levels are adjusted to increase or decrease the brightness intensity, while keeping constant the gamma correction. This maintains the relative contrast of images while rendering them at a different brightness. Implementations of the present process include an adjusted gamma correction lookup table, incorporated in the video card to modify the video signal before reaching the display. The present invention can be used for matching the brightness of two or more displays or to provide compensation for variations in display characteristics to ensure consistency in display brightness within a data processing model. | 12-04-2008 |
20100141624 | ADAPTIVE METHOD FOR ACQUIRING COLOR MEASUREMENTS - A system and method for measuring a color parameter values of a display for calibration purposes. An initial measurement of the color parameter value from the display is performed. Next, a number of additional measurements is determined in response to the value of the initial color parameter value. The color parameter value of the display is measured by the number of additional measurements in order to determine an average color parameter value of the display which will be used for calibration purposes. | 06-10-2010 |
20100165363 | Methods and systems for calibrating a source and destination pair - At least certain embodiments of the disclosures relate to methods and data processing systems for matching a source profile to a destination profile. In one embodiment, a method includes providing a destination test chart and a corresponding first source test chart with each test chart having color patches. The method includes adjusting the source profile to substantially match a known or an unknown destination profile in response to receiving an input for visually matching an adjustable white color patch of the first source test chart to a corresponding white color patch of the destination test chart. The method includes progressively generating a second source test chart having modified at least some and possibly all color patches compared to the first displayed test chart based on applying a first transformation to the source profile in response to visually matching the white color patch. | 07-01-2010 |
20130226495 | Method and Apparatus for Adaptive Display Calibration - A calibration system may be provided for calibrating displays in electronic devices during manufacturing. The calibration system may include calibration computing equipment and a test chamber having a light sensor. The calibration computing equipment may be configured to operate the light sensor and the display to gather display performance data. The calibration computing equipment may extract display performance statistics from the display performance data and adaptively select and perform display calibration sequences using the display performance statistics. The calibration computing equipment may be configured to determine whether or not to perform display calibration and whether or not to gather additional display performance data based on display performance statistics extracted during a preceding display calibration sequence. The calibration computing equipment may be configured to iteratively and adaptively perform display calibration sequences until a display is successfully calibrated. | 08-29-2013 |
20130314447 | Method and Apparatus for Display Calibration - A calibration system may be provided for calibrating displays in electronic devices during manufacturing. The calibration system may include calibration computing equipment and a test chamber having a light sensor. The calibration computing equipment may be configured to operate the light sensor and the display to gather display intensity performance data for obtaining a display gamma model. The display intensity performance data may be gathered using a range of display control settings that will be used in performing color calibration operations for the display. The calibration computing equipment may be configured to operate the light sensor and the display to gather display color performance data for determining a display white point calibration. Display white point calibration data may be provided to the electronic device and stored in volatile or non-volatile memory in the device or may be permanently stored in circuitry associated with the display. | 11-28-2013 |
20140028858 | Displays and Temperature Adaptive Display Calibration - A calibration system may be provided for calibrating displays in electronic devices during manufacturing. The calibration system may include calibration computing equipment and a test chamber having a light sensor. The calibration computing equipment may be configured to operate the light sensor and the display to gather display white point information such as the native white point of the display. Temperature data may be gathered from the electronic device during display calibration operations using a thermal sensor. The calibration computing equipment may determine a temperature adaptive target white point based on the gathered temperature data. The calibration computing equipment may be configured to compare the native white point of the display with the temperature adaptive target point. Based on the comparison, the calibration computing equipment may generate corresponding display calibration parameters. The display calibration parameters may be provided to and stored in the electronic device. | 01-30-2014 |
20140043369 | Displays and Display Pixel Adaptation - An electronic device may include a display and display control circuitry. The display may be calibrated to reduce color non-uniformity in the display. Display calibration information may be obtained during manufacturing and may be stored in the electronic device. The display calibration information may include color-specific, intensity-specific, location-specific correction factors. During operation of the display, display control circuitry may receive pixel data to be displayed by each pixel in the display. The pixel data may include color information and intensity information for each pixel. Based on the color information for each pixel, the intensity information for each pixel, and the location of each pixel in the display, the display control circuitry may determine a color-specific, intensity-specific, location-specific correction factor to apply to the pixel data for each pixel. Adapted pixel data may be supplied to each pixel in the display. | 02-13-2014 |
20140139570 | Dynamic Color Adjustment for Displays Using Local Temperature Measurements - An electronic device may include a display and display control circuitry. The display may be calibrated to compensate for changes in display temperature. Display calibration information may be obtained during manufacturing and may be stored in the electronic device. The display calibration information may include adjustment factors configured to adjust incoming pixel values to reduce temperature-related color shifts. During operation of the electronic device, display control circuitry may determine the temperature at different locations on the display. The display control circuitry may determine the temperature at a given display pixel using the temperatures at the different locations on the display. The display control circuitry may determine adjustment values based on the temperature at the display pixel. The display control circuitry may apply the adjustment values to incoming pixel values to obtain adapted pixel values, which may in turn be provided to the display pixel. | 05-22-2014 |
20140139571 | Dynamic Color Adjustment for Displays - An electronic device may include a display and display control circuitry. The display may be calibrated to compensate for changes in display temperature. Display calibration information may be obtained during manufacturing and may be stored in the electronic device. The display calibration information may include color-specific adjustment factors configured to adjust display colors and reduce temperature-related color shifts. During operation of the display, the display control circuitry may receive input pixel values for a display pixel. The display control circuitry may also receive display temperature information from a temperature sensor in the electronic device. The display control circuitry may determine adjustment factors based on a color associated with the input pixel values and the display temperature information. The display control circuitry may apply the adjustment factors to the input pixel values to obtain adapted pixel values. The adapted pixel values may be provided to the display pixel. | 05-22-2014 |
20140192209 | PARALLEL SENSING CONFIGURATION COVERS SPECTRUM AND COLORIMETRIC QUANTITIES WITH SPATIAL RESOLUTION - An optical test equipment/method for display testing that features parallel testing/sensing configuration that covers spectrum and colorimetric quantities with spatial resolution is disclosed. In one embodiment, a spectra-camera, which is a hybrid system consisting of both a single-point spectrometer and an imaging colorimeter, can be configured for concurrent display artifact and parametric testing. An aperture mirror with a hole in the middle splits an image of a test display into two parts. One part of the image passes through the hole and is directed to the spectrometer for display parametric testing. The rest of the image is reflected off the aperture mirror for concurrent display artifact testing with the colorimeter. In another embodiment, a beam splitter can be used instead of an aperture mirror. In yet another embodiment, the single-point high accuracy spectrometer can be used to calibrate the low accuracy imaging colorimeter. | 07-10-2014 |
20140267785 | Methods for Display Uniform Gray Tracking and Gamma Calibration - A method is provided for calibrating a display having color channels. Each color channel is capable of adjusting settings for pixel values at gray level entries. The method includes selecting a gray level entry for calibration. The method also includes providing a target white point in chromaticity coordinates (x, y) and a target brightness at the selected gray level entry to the display. The method further includes adjusting the setting for the pixel values for the color channels at the selected gray level entry such that the display achieves the target white point and the target brightness at an adjusted pixel value. | 09-18-2014 |
20140333683 | Adaptive Color Gamut Management for RGBW Display Systems - An electronic device may include a display having an array of display pixels. Each display pixel may include a red subpixel, a green subpixel, a blue subpixel, and a white subpixel. The display may be controlled using display control circuitry. The display control circuitry may convert frames of display data from a red-green-blue (RGB) color space to a red-green-blue-white (RGBW) color space. The display control circuitry may supply data signals corresponding to a frame of display data in the RGBW color space to the array of display pixels. A frame of display data may be converted from the RGB color space to the RGBW color space based on an amount of color saturation in the frame of display data, based on information identifying what code is running on control circuitry in the electronic device, and/or based on ambient lighting condition information. | 11-13-2014 |
20140333684 | METHODS AND APPARATUSES FOR INCREASING THE APPARENT BRIGHTNESS OF A DISPLAY - Methods and apparatuses to varying the apparent brightness of a display are described. The change in apparent brightness is accompanied by unchanged in relative contrast, rendering a display with higher or lower brightness while maintaining contrast fidelity. In exemplary embodiments, the signals for the middle tone levels are adjusted to increase or decrease the brightness intensity, while keeping constant the gamma correction. This maintains the relative contrast of images while rendering them at a different brightness. Implementations of the present process include an adjusted gamma correction lookup table, incorporated in the video card to modify the video signal before reaching the display. The present invention can be used for matching the brightness of two or more displays or to provide compensation for variations in display characteristics to ensure consistency in display brightness within a data processing model. | 11-13-2014 |
20140354521 | Color Space Conversion Methods for Electronic Device Displays - An electronic device may include a display having an array of display pixels. Storage and processing circuitry may generate display data for the display in an RGB input color space. The display may display the display data in an RGBW output color space. Display control circuitry may use sets of predetermined conversion factors to convert display data from the RGB input color space to the RGBW output color space without requiring conversion to a device-independent color space. Each set of predetermined conversion factors may be associated with a color in a set of predetermined colors. Using the sets of predetermined conversion factors, the display control circuitry may convert RGB values in the input color space to RGBW values in the output color space. The display control circuitry may supply data signals corresponding to the display data in the RGBW output color space to the array of display pixels. | 12-04-2014 |