Patent application number | Description | Published |
20090219268 | IMAGE DISPLAY APPARATUS, CORRECTION CIRCUIT THEREOF AND METHOD FOR DRIVING IMAGE DISPLAY APPARATUS - A correction circuit includes a timing control circuit for dividing a drive period assigned for drive of display devices into plural calculation slots, a luminance calculation circuit for calculating luminance including an effect of a voltage drop for each calculation slot, an accumulation circuit for temporally accumulating the luminance for each calculation slot, a corrected data determination circuit for outputting, as a corrected data, the value determined in accordance with the calculation slot at the time point when the accumulated luminance reaches a target luminance value, and a conversion circuit for converting the corrected data into modulation data to be applied to a modulation circuit. The width of the calculation slot is shorter than the width of the slot for pulse width modulation in at least a part of the drive period. The conversion circuit reduces the bit width of the corrected data by pseudo-gradation processing. | 09-03-2009 |
20090219308 | IMAGE DISPLAY APPARATUS, CORRECTION CIRCUIT THEREOF AND METHOD FOR DRIVING IMAGE DISPLAY APPARATUS - An image display apparatus includes: a correction circuit that outputs corrected data based on luminance data designating luminance of display devices, and a modulation circuit that outputs a pulse width modulation signal for driving the display device to the column wiring based on the corrected data. The correction circuit includes: a luminance calculation circuit that calculates luminance including an effect of a voltage drop in the row wiring and an effect of a light emission time of the display device for each predetermined time slot; an accumulation circuit that temporally accumulates the luminance for each time slot; and a corrected data determination circuit that outputs, as the corrected data, a value determined in accordance with the time slot at a time point when an accumulated luminance value obtained by the temporal accumulation reaches a target luminance value. | 09-03-2009 |
20090244037 | IMAGE DISPLAY APPARATUS AND DRIVING METHOD OF THE IMAGE DISPLAY APPARATUS - An image display apparatus is driven by a driving method including, based on a horizontal synchronizing signal, stopping an output of a modulation signal at a first timing regardless of the state of the modulation signal, shifting a row wiring, to which a selection signal is output, at a second timing, and starting the output of the modulation signal at a third timing. The first timing is performed before the second timing, whereby the image display apparatus can be stably driven against a wrong horizontal synchronizing signal. | 10-01-2009 |
20110050748 | IMAGE DISPLAY APPARATUS AND LUMINANCE CONTROL METHOD THEREOF - An image display apparatus includes: a display panel; a calculation circuit that calculates a luminance control value, which is a parameter for controlling display luminance, for each frame of a video signal to be displayed on the display panel; and a luminance control circuit that controls the display luminance of the frame using the luminance control value calculated by the calculation circuit. When the video signal is a video signal in which one image is constituted by a plurality of frames, the luminance control circuit applies a same luminance control value to the plurality of frames constituting one image, or decreases the difference of the luminance control values applied to the plurality of frames constituting one image to be lower than a predetermined value. | 03-03-2011 |
20110057964 | IMAGE DISPLAY APPARATUS AND METHOD FOR CONTROLLING THE SAME - An image display apparatus comprises: a display panel; and an image processing unit which divides one frame into a frame of a main image and N frame(s) of sub-image(s), and outputs a video signal that includes the frame of the main image and the frame(s) of the sub-image(s) to the display panel, wherein the image processing unit comprises: a brightness control unit which generates frames corresponding to the main image and the sub-images based on the same input image data, and relatively reduces the brightness of the frame corresponding to the sub-image with respect to the brightness of the frame corresponding to the main image; and a period setting unit which sets a length of respective horizontal scan periods so that the horizontal scan period in the frame of the main image is longer than the horizontal scan period in the frames of the sub-image. | 03-10-2011 |
20110187933 | IMAGE DISPLAY APPARATUS AND METHOD FOR CONTROLLING IMAGE DISPLAY APPARATUS - An image display apparatus of the present invention includes: a display panel; a signal processing unit which corrects an input video signal using correction parameters, and outputs the corrected video signal to the display panel; a power supply unit which supplies voltage to the display panel; a storage unit which stores the correction parameters; and a control unit, which, at startup of the image display apparatus, executes boosting processing for boosting voltage supplied from the power supply unit to the display panel up to a voltage required for driving the display panel in stages, and transfer processing for transferring the correction parameters from the storage unit to the signal processing unit, wherein the transfer processing is processing for intermittently transferring the correction parameters using a period when boosting is not performed in the boosting processing. | 08-04-2011 |
20110317072 | IMAGE PROCESSING APPARATUS AND CONTROL METHOD THEREOF - A brightness control unit includes: a “feedback brightness control unit” that calculates a first gain from a corrected image data and multiplies the first gain by image data prior to correct; and a “feedforward brightness control unit” which, when a scene change is detected, calculates a second gain on the basis of a difference between the first gain which is calculated from the corrected image data and the first gain which has been multiplied by the pre-correction image data of the corrected image data in order to correct the difference, and multiplies the second gain by the corrected image data. | 12-29-2011 |
20120044252 | IMAGE DISPLAY APPARATUS AND METHOD OF CONTROLLING THE SAME - An image display apparatus includes an image processing circuit configured to generate an image signal based on input image data such that the image signal includes a main-image frame and a sub-image frame with luminance lower than that of the main-image frame. The image processing circuit includes a conversion circuit and a memory control circuit. The conversion circuit converts frame synchronization signals of respective frames such that the main-image frame has a longer horizontal scanning period than the sub-image frame. The memory control circuit switches, in a period in which the unconverted synchronization signal and the converted synchronization signal are both in a vertical blanking period, operation modes of two frame memories between writing and reading. The image display apparatus is capable of suppressing a visible disturbance in image quality and a reduction in the total image luminance of a moving image without increasing a frame memory transfer rate. | 02-23-2012 |
20140132923 | OPHTHALMIC IMAGING APPARATUS, CONTROL METHOD FOR OPHTHALMIC IMAGING APPARATUS, AND STORAGE MEDIUM - An ophthalmic imaging apparatus including an observation light source configured to emit observation light for observation of an eye to be examined and an imaging light source configured to emit imaging light for imaging the eye, the apparatus comprises a photometry unit configured to acquire a photometric value of an observation image of the eye illuminated by the observation light source; an alignment processing unit configured to perform alignment processing to match the eye with a target position; an imaging light amount adjusting unit configured to adjust a light amount of the imaging light source by using the photometric value before completion of the alignment processing; and an imaging processing unit configured to image the eye by using a light amount adjusted by the imaging light amount adjusting unit after completion of the alignment processing. | 05-15-2014 |
20140132924 | OPHTHALMIC APPARATUS AND ALIGNMENT DETERMINATION METHOD - An ophthalmic apparatus that determines whether alignment with a subject eye is complete using an observation image of an anterior ocular segment of the subject eye obtained through a split prism determines whether or not the alignment is a success or failure based on a position of a pupil image on respective lines of a line pair that are parallel to a boundary of the split prism and are equidistant from the boundary in the observation image. The ophthalmic apparatus determines the success or failure of alignment for a plurality of line pairs whose distances from the boundary are different, and determines whether or not the alignment is complete based on the obtained determination results. | 05-15-2014 |