Patent application number | Description | Published |
20090167193 | IMAGE-PROCESSING EQUIPMENTS, IMAGE-PROCESSING METHOD, PROGRAM, AND RECORDING MEDIUM - An image display apparatus which represents a grayscale by pulse-width modulation driving of a display element includes: a light source which illuminates the display element; a light source driving part which drives the light source; a photodetector which detects the emission intensity of light emitted from the light source; a sample-and-holder which obtains the emission intensity of the light source by the photodetector at a predetermined timing in a light emission period of the light source; and a compensation current generating part which (i) obtains the manner in which the emission intensity of the light source changes on the basis of a first sample value obtained at a first timing by the sample-and-holder and of a second sample value obtained at a second timing by the sample-and-holder or a predetermined target value of the emission intensity; and (ii) controls the light source driving part for compensating the emission intensity of the light source on the basis of the obtained manner in which the emission intensity changes. | 07-02-2009 |
20100195062 | DISCHARGE LAMP LIGHTING DEVICE AND PROJECTOR - The polarity of a voltage applied to the electrode pair is inverted by a changing signal generated at every boundary area of each filter color of the color wheel, and also in the blue color region (B) (a, b. c). Herewith, time during which the lamp electrode is positive and that negative is equal to each other every time the color wheel makes two rotations (T), thereby maintaining the heat load to be evenly distributed between both of the electrodes. | 08-05-2010 |
20110234647 | IMAGE DISPLAY DEVICE - An image display device includes a plurality solid-state light sources, a modulator configured to modulate light from a plurality of solid-state light sources, and an image display device configured to generate from a frame of image data, a plurality of subframes each further divided into subfields, and to display the plurality of subframes. The modulator turns off light output from all the solid-state light sources for the duration of one or more of the plurality of subframes, whereby it is possible to reduce motion blur arising from a hold-type display device, in which after-images remain on the retina of a person's eyes when viewing moving objects. | 09-29-2011 |
20110242496 | PROJECTION IMAGE DISPLAY DEVICE - A projection image display device has a plurality of light sources, a phosphor layer that emits light through excitation by at least any one of the light sources, an optical section, a temperature detector, a light-source intensity controller, an amplitude controller, a luminance controller. The optical section determines an optical path of light emitted from the light sources and the phosphor layer. The temperature detector directly or indirectly detects temperature of the phosphor layer or of the periphery of the phosphor layer. The light-source intensity controller controls intensity of an excitation light source that excites the phosphor layer. The amplitude controller controls the amplitude of a projection image signal. The luminance controller controls luminance of projection images by switching the light-source intensity controller and the amplitude controller according to a detected temperature. | 10-06-2011 |
20140160440 | LIGHT QUANTITY MEASUREMENT APPARATUS AND PROJECTION-TYPE DISPLAY DEVICE EQUIPPED WITH SAME - The light quantity measurement apparatus disclosed herein comprises an optical semiconductor, an amplifier element, a resistor unit, an A/D converter, and a controller. The optical semiconductor receives a plurality of colors of light emitted from a light source in a time division. The amplifier element converts optical current flowing to the optical semiconductor into voltage by receiving the plurality of colors of light. The resistor unit switches the gain for converting the optical current inputted to the amplifier element into voltage, for each of the plurality of colors of light. The A/D converter converts the voltage outputted by the amplifier element from an analog signal into a digital signal. The controller controls the resistor unit so that the output level corresponding to the various colors of light outputted from the A/D converter will remain substantially same level. | 06-12-2014 |
20140368798 | SEMICONDUCTOR LIGHT SOURCE DRIVING APPARATUS AND A PROJECTION TYPE DISPLAY APPARATUS - A semiconductor light source driving apparatus includes a light source unit including plural light source modules connected in series, each light source module including a series circuit including one or more series-connected light source elements and a switching element connected in parallel with the series circuit, a current detection unit for detecting a current flowing into the light source unit, and a controller. The controller identifies a light source module including a light source element which has disconnection failure based on a signal from the current detection unit, and stores information indicating the identified light source module in the memory unit. The controller turns on the switching element of the light source module including the light source element having disconnection failure based on the information stored in the memory unit to solve the disconnection failure. | 12-18-2014 |
20150264291 | PROJECTION VIDEO DISPLAY APPARATUS - A projection video display apparatus includes: a converter that converts an input video signal having a first number of pixels and a first frame rate into a conversion video signal having a second number of pixels and a second frame rate, the second number of pixels being smaller than the first number of pixels, and the second frame rate being an n-th multiple (n is an integer of 2 or greater) of the first frame rate; an optical element that displaces an optical axis of the video light beam; an optical element driving unit that drives the optical element at a frequency F being a natural-number multiple of the first frame rate; and a rotating body that rotates at a rotation speed R. The rotation speed R is set so as to become a value within a predetermined range corresponding to the frequency F. | 09-17-2015 |
20150264760 | SEMICONDUCTOR LIGHT SOURCE DRIVE DEVICE AND PROJECTION VIDEO DISPLAY APPARATUS - The semiconductor light source drive device according to the present disclosure includes: a switching power source that is connected in series with a semiconductor light source element and a constant current circuit to output a predetermined voltage to the semiconductor light source element and the constant current circuit; a detection circuit that detects a voltage at a connecting point between the semiconductor light source element and the constant current circuit; and a controller that controls the voltage output from the switching power source based on the voltage detected by the detection circuit, and controls a current value of the constant current circuit based on a switching signal. The controller, prior to varying the current value of the constant current circuit, varies the voltage output from the switching power source in accordance with an amount to be varied in the current value of the constant current circuit. | 09-17-2015 |