Patent application number | Description | Published |
20080204667 | PROJECTION DISPLAY AND LIGHTING UNIT - A lighting unit that optimizes an oscillation frequency for oscillating a diffusion device and its amplitude amount and a projecting display using the lighting unit are provided. Driving of a light source driving unit is controlled on the basis of driving of the oscillation driving unit. | 08-28-2008 |
20080278636 | Optical unit, video display apparatus, and color switching method - A projection-type video display apparatus has a polarizing beam splitter for matching light, which is outputted by a light source unit, to one of S polarizing light and P polarizing light, an optical characteristics switching element for electrically and periodically switching a wavelength band of light outputted by the polarizing beam splitter, a video display element, as a light valve element, for forming an optical image from light outputted by the light source unit, in accordance with a video signal, and a radiating unit for radiating a plurality of color light, which are sequentially outputted by the optical characteristics switching element, to the video display element, wherein light outputted by the video display element is incident on a projecting lens, and a light path from the light source unit to the projecting lens is U-shaped. Consequently, the projection-type video display apparatus becomes compact and has improved contrast. | 11-13-2008 |
20080297463 | LIQUID CRYSTAL DISPLAY APPARATUS AND LUMINANCE CONTROL METHOD THEREOF - For the purpose of suppressing untrue black with the change in luminance of video, which is displayed as the same object, being reduced to improve the contrast, there is provided a liquid crystal display apparatus that is capable of: extracting the pixel frequency distribution of an input video signal on a luminance level basis, and extracting the pixel frequency distribution of specific color from a color-difference signal of input video in a screen area, the color-difference signal being determined from the luminance distribution of a plurality of backlights; on the basis of the result of the extraction, determining the control amount of the luminance of the plurality of backlights, and the correction amount of the luminance of a liquid crystal panel, on a screen area basis; controlling the luminance of the plurality of backlights on the basis of the control amount of the luminance; and at the same time, controlling the luminance of the input video signal on the basis of the correction amount of the luminance. | 12-04-2008 |
20080297683 | LIQUID CRYSTAL DISPLAY DEVICE - A direct type backlight unit used in a liquid crystal display device is provided which can suppress lowering of luminance at an electrode portion of a linear light source. A reflecting plate is formed on a side wall of a box-shaped reflector close to an end of a linear light source. The reflector reflects light beams from the linear light source to be guided toward a liquid crystal panel. The reflecting plate on the side wall has at least two inclined surfaces. The inclined surfaces may have a stepped shape or a convex ridge shape. According to this arrangement, it is possible to reduce or eliminate decrease of the luminance level at ends of an effective display area of a liquid crystal panel. | 12-04-2008 |
20080297692 | Image Display Apparatus and Backlight Unit to Be Used Therein - An image display apparatus includes a backlight unit including a plurality of light sources arranged in a flat, a reflecting portion for reflecting light from the light sources, a diffuser for diffusing the light from the light sources and the light reflected from the reflecting portion, and a chassis for maintaining or supporting the light sources, the reflecting portion and the diffuser; and a liquid crystal display unit which receives the light diffused by the diffuser of the backlight unit. Concave portions are formed in the chassis at positions corresponding to electrodes of the plurality of light sources, positions corresponding to light-emitting portions of the light sources are arranged in a flat, and a circuit for driving the liquid crystal display unit is provided on a rear surface of a planar portion of the chassis. Accordingly, it is possible to realize a thin lightweight backlight with high luminance and high luminance uniformity. | 12-04-2008 |
20090059125 | Image display apparatus - An image display apparatus includes: a plurality of light sources for emitting light; an optical uniformizing portion for uniformizing light emitted from the plurality of light sources; a total reflection portion disposed above the plurality of light sources, the total reflection portion totally reflecting light from the optical uniformizing portion; an optical guide portion for guiding light totally reflected at the total reflection portion; an optical diffusion unit for diffusing light from the total reflection portion and outputting the diffused light; an optical parallelizing unit for parallelizing light from the optical diffusion unit; and a liquid crystal panel for modulating light from the optical parallelizing unit into an optical image in accordance with an image signal and displaying the optical image. | 03-05-2009 |
20090059179 | IMAGE DISPLAYING APPARATUS, AND A METHOD FOR ADJUSTING VIBRATING CONDITION OF A REFLECTION MIRROR IN THE IMAGE DISPLAYING APPARATUS - For enabling to prevent ill effects from being generated in the structures of a reflection mirror, even if increasing an output energy from a light source, thereby preventing ill influences from being exerted on the driving condition thereof, a mirror drive controller unit | 03-05-2009 |
20090237627 | Display Apparatus Using Micro Mirror Unit, and Method for Controlling Micro Mirror Unit - In a method for driving a micro mirror such as MEMS mirror and a display apparatus using the method, there are provided a mirror driving unit for driving the micro mirror which operates in a resonant mode and a nonresonant mode, a driving-condition setting unit for setting a mirror driving condition, a switching unit for switching on/off a mirror driving signal in the nonresonant mode, and a look-up table for indicating the relationship of a mirror response with respect to the driving condition already known in advance. The switching unit controls the transmission of the nonresonant-mode mirror driving signal while grasping the mirror response state with respect to the mirror driving signal, thereby finely increasing and decreasing a driving torque for the micro mirror. This fine increase and decrease allows the micro mirror to be fluctuated stably, and a further enhancement in the fluctuation rate. | 09-24-2009 |
20100079683 | DISPLAY APPARATUS - A display apparatus is provided which, when projecting a video onto a curved surface of an object for display, can realize an undistorted display of the video. The measuring means outputs the distance information representing the distance to the object. Based on the distance information produced by the measuring means, the curved surface contour is detected with high precision. According to at least the detected curved surface contour distortions, pixels of the display image are unevenly rearranged to correct the video information before it is output. This arrangement realizes an undistorted display of video when the video is projected onto the curved surface of the object. | 04-01-2010 |
20100182541 | Backlight Unit and a Liquid Crystal Display Apparatus Applying the Same Therein - A backlight unit, being thin-sized, but having high definition and high uniformity of luminance, and a video display apparatus applying the same therein, has a plural number of sets of at least one or more of light source(s) ( | 07-22-2010 |
20100214508 | Backlight Unit and Liquid Crystal Display Device Using the Same - A backlight unit having a LED light source includes a light guide plate partitioned in areas each having a tapered shape formed of a thick portion and a thin portion. The light guide plate is formed such that a thick portion and a thin portion are repeated at certain intervals, and the repeated thick portions and the repeated thin portions gradually decrease in thickness. The LED light source is attached to a lateral side of each thick portion. Grooves are formed in the light irradiation direction of the LED light source and in a direction perpendicularly intersecting the light irradiation direction. Each of the grooves is formed in an concave shape (V-shape or trapezoid-shape). There is a relation 0.2/30<=W/D<0.1 where D denotes the distance between the light guide plate and a light diffusion plate, and W denotes the width of each of the grooves. An inclination angle θ relative to the center of each of the grooves is between 9 and 15 degrees inclusive. | 08-26-2010 |
20100220246 | BACKLIGHT DEVICE AND VIDEO DISPLAY APPARATUS USING THE SAME - In a backlight device manufactured by simultaneously arranging a plurality of backlight blocks in a combination manner, while each of the backlight blocks is comprised of: a light emitting source containing an LED, or a fluorescent lamp; a light conducting plate for conducting light emitted from the light emitting source to the side of a liquid crystal panel; and a reflection seat arranged on a rear plane of the light conducting plate; a dark luminance portion and a middle dark/bright luminance portion corresponding to dark/bright difference patterns for producing a dark/bright difference in luminance emitted from the backlight blocks are formed; and luminance of a bright luminance portion corresponding to a bright pattern of luminance emitted from a boundary between the backlight blocks is caused not to become visually conspicuous by a luminance fluctuation of the dark/bright difference pattern emitted from the backlight blocks. | 09-02-2010 |
20100245711 | LIQUID CRYSTAL DISPLAY DEVICE - In a liquid crystal display device having a direct-lighting backlight using LEDs as a light source, the number of LEDs is reduced without causing unevenness in brightness. An LED is disposed under a cylindrical lens to be closer to one end of the lens than a middle part of the lens. Light emitted from the LED is outputted, as diffused light, upward from an end diffusion surface of the lens. A portion of the top surface of the lens makes up a total reflection surface to reflect light emitted from the LED and thereby cause the reflected light to head for the other end of the lens. Diffusion surfaces formed on the top surface and the bottom surface of the lens radiate diffused light upward of the lens, causing uniform light to be radiated from the whole top surface of the lens. | 09-30-2010 |
20100259727 | OPTICAL UNIT - Disclosed is an optical unit for an image display device, the unit including: one or a plurality of light sources; one or a plurality of optical elements that control a spread of light; a combining element that combines the beams of light emitted from the light sources; and a scanning element, wherein the light from each of the light sources generates an elliptical beam spot on a screen and the spot has a major axis substantially perpendicular to a scanning direction, the result is that the unit is simple in structure, inexpensive, compact, lightweight, and capable of providing high-resolution image quality, thus providing the display device reduced dimensionally and in weight. Such an image display device using the optical unit is also disclosed. | 10-14-2010 |
20100296026 | LIQUID CRYSTAL DISPLAY DEVICE - An LCD device using LEDs as light sources provided herein is capable of reducing the manufacturing cost and the power consumption by a reduction in the number of LEDs used. A backlight according to the present invention includes LEDs mounted on a wiring board and a light guide plate having a matrix array of light guide plate blocks assigned the LEDs. The number of LEDs assigned to the block located in a peripheral area is smaller than the number assigned to the block located around the center to reduce the number of LEDs used in the backlight. If a ratio of the brightness in a peripheral area of the screen to the brightness in a central area is 60% or higher, the human eye does not perceive non-uniform luminance. Thus, the manufacturing cost and the power consumption of the LCD device can be reduced. | 11-25-2010 |
20110080532 | BACKLIGHT UNIT AND VIDEO DISPLAY APPARATUS APPLYING THE SAME THEREIN - A backlight unit of thin-type comprises: at least one or more light source(s); plural numbers of light guide plates, each of which is configured to guide and irradiate the light of the light source(s) to a side of a liquid crystal panel; and a chassis, on which the light source(s) and the light guide plates are fixed, thereby being constructed by aligning the light guide plates, wherein the following conditions are satisfied: | 04-07-2011 |
20110242498 | LASER PROJECTOR - A projector using coherent light as a light source includes: one or more coherent light sources emitting coherent light beams; a beam scanner which changes a direction of the coherent light beam; and a beam splitter which splits a beam into multiple segments and changes a phase of light of each split segment, the beam splitter being located in an optical path between the beam scanner and the coherent light source. This projector reduces speckle noises. The beam splitter includes a pair of transparent substrates; a plurality of parallel electrodes disposed on each surface of the pair of transparent substrates, the pair of the parallel electrodes being disposed in a perpendicular direction to each other. Voltages are applied to the respective electrodes at predetermined time intervals so as to produce different potentials in a liquid crystal sandwiched by the transparent substrates. | 10-06-2011 |
20110249220 | IMAGE DISPLAY APPARATUS AND BACKLIGHT APPARATUS USED THEREFOR - A plurality of backlight blocks are aligned, each block includes light sources and a unit light guide plate for guiding light from the light sources to the side of a liquid crystal panel, unit diffusion patterns are formed in a zigzag alignment on the unit light guide plate and another diffusion pattern is formed on the back of the unit light guide plate. One side of the unit light guide plate is defined as a light entrance surface and LEDs as the light sources are aligned along the light entrance surface to satisfy p≧a≧c where a indicates the size of the unit diffusion pattern in a direction orthogonal to an exit optical axis of the LEDs, c indicates the size of an LED emission surface in the direction of alignment of the LEDs, and p indicates the pitch of alignment of the light sources. | 10-13-2011 |
20110255029 | LIQUID CRYSTAL DISPLAY DEVICE - In a liquid crystal display device, two light guide plates are arranged in parallel at a predetermined distance from each other to function as a backlight. The two light guide plates are provided between a liquid crystal display panel and a circuit substrate on which LEDs are mounted. Each of the light guide plates includes a plurality of divided light guide plates. Each of the divided light guide plates is divided into a plurality of light guide plate blocks by grooves. In opposed portions of the two light guide plates, side surfaces of the light guide plates are inclined. Then, a rough surface is formed on the respective inclined surfaces. Because of this shape, light interference easily occurs between the two light guide plates. As a result, it is possible to prevent lowering of brightness in the opposed portions of the two light guide plates. | 10-20-2011 |
20110273629 | IMAGE DISPLAYING APPARATUS, AND A METHOD FOR ADJUSTING VIBRATING CONDITION OF A REFLECTION MIRROR IN THE IMAGE DISLAYING APPARATUS - For enabling to prevent ill effects from being generated in the structures of a reflection mirror, even if increasing an output energy from a light source, thereby preventing ill influences from being exerted on the driving condition thereof, a mirror drive controller unit | 11-10-2011 |
20110316766 | LIQUID CRYSTAL DISPLAY DEVICE, BACKLIGHT AND LED - A cross section of each divided light guiding plate is formed in a wedge shape, a step is formed at a portion of each divided light guiding plate where LEDs are arranged, and holes used for accommodating the LEDs are formed at the step. A plated face is formed on a lower face of each LED, and is coupled to a wiring substrate through solder. Each LED includes a light-emitting face, a lower frame, and an upper frame. The height of the lower frame of each LED is larger than the height of the upper frame, so that a lower end of the light-emitting face of each LED can be always located higher than a lower end of the divided light guiding plate. | 12-29-2011 |
20120069265 | DISPLAY APPARATUS AND BACK LIGHT UNIT TO BE USED THEREFOR - A back light unit includes a light source unit combined with an optical waveguide having translucency to guide a light of light source in a direction of liquid crystal panel, and a chassis for holding or supporting the light source unit. The optical waveguide is formed in plate-like shape, a face opposing to the back face of liquid crystal panel is used as a light emitting surface, a face opposing to the chassis is used as a reflecting face for reflecting a light, one of a plurality of side faces adjacent to light emitting surface and reflecting face is used as a light incidence surface where a light from the light source is injected. The light source unit is arranged in multiple in a horizontal direction or a vertical direction of the liquid crystal panel, in the back face side of the liquid crystal panel. | 03-22-2012 |
20120082177 | LASER PROJECTOR AND METHOD OF SCANNING LASER BEAM - A laser projector for scanning a laser beam output by a multimode laser light source and displaying an image includes a laser driving unit to drive the multimode laser light source so that two-dimensional output patterns of a shape of the laser beam are different in each display frame. The laser driving unit applies to the multimode laser light source a driving waveform pattern which has the same product of an output intensity and output time of a laser light source during a display time of one dot and which includes an output intensity and output time different in each display frame. | 04-05-2012 |
20120113359 | Backlight Unit and a Liquid Crystal Display Apparatus Applying the Same Therein - A backlight unit and a video display apparatus having a plural number of sets of one or more of light sources. A light guidance plate for guiding lights from the light sources to a side of a liquid crystal panel, to be emitted. The light sources are disposed on one end side of the light guidance plate. Assuming that width of the gap or groove is “d”, distance between a light incident surface of the liquid crystal panel and a light emission surface of the light guidance plate, or distance between a light incident surface of an optical member disposed between the liquid crystal panel and the light guidance plate and a light emission surface of the light guidance plate is “h”, and further 2.0 mm>d≧0.1 mm and 10.0 mm>h≧0.4 mm, then the following condition is satisfied: 4≦h/d≦100. | 05-10-2012 |
20120140149 | LIQUID CRYSTAL DISPLAY APPARATUS - A liquid crystal display apparatus equipped with a backlight unit includes an LED, a light guide plate for light emission by guiding light from the LED to a liquid crystal panel, an LED board for driving the LED, a reflection sheet interposed between the light guide plate and the LED board, and a chassis on which the LED, the light guide plate, the reflection sheet and the LED board are mounted. The light guide plate has a half length and a half width of the liquid crystal panel, and the reflection sheet has substantially the same size as the light guide plate. The reflection sheet is extended at portions abutting on sides of the chassis to define flanges. | 06-07-2012 |
20120140447 | BACKLIGHT UNIT AND IMAGE DISPLAY USING THE SAME - A backlight unit includes light emitting diodes (LED's) and light guide plate which guides light from the light emitting diodes to liquid crystal panel and is constructed so that light is emitted from light emission plane of light guide plate opposite to liquid crystal panel toward liquid crystal panel. Area of light emission plane of light guide plate is smaller than effective display area of liquid crystal panel and predetermined shape for diffusing or dispersing light is formed on a lateral side perpendicular to light emission plane of light guide plate and/or at an edge portion near the lateral side of the light emission plane. | 06-07-2012 |
20120147277 | BACK LIGHT UNIT AND DISPLAY APPARATUS USING THE SAME - To provide a back light unit that reduces an uneven brightness and has a spatially uniform brightness distribution. According to an aspect of the present invention, the back light unit comprises an LED and a light guide plate for guiding light from the LED to a liquid crystal panel side, wherein a recess is provided on the back surface side of the light guide plate, wherein a plurality of LEDs are housed in the recess, and wherein a light amount limiting member is provided at a position facing the recess on s light exit surface side of the light guide plate. The light amount limiting member is configured, for example, by applying an ink with a predetermined optical property to a transparent sheet. | 06-14-2012 |
20120147294 | Backlight Unit and Liquid Crystal Display Device Using the Same - “A backlight unit having a LED light source which includes a light guide plate partitioned in areas having a tapered shape formed of a thick and thin portion. The light guide plate forms a thick and thin portion repeated at certain intervals, and the repeated thick portions and the repeated thin portions gradually decrease in thickness. The LED light source is attached to a lateral side of thick portions. Grooves are formed in the light irradiation direction of the LED light source and in a direction perpendicularly intersecting the light irradiation direction. Each of the grooves is formed in an concave shape. There is a relation 0.2/30<=W/D<0.1 where D denotes the distance between the light guide plate and a light diffusion plate, and W denotes the width of each of the grooves. An inclination angle 0 relative to the center of each of the grooves is between 9 and 15 degrees inclusive. | 06-14-2012 |
20120229727 | ILLUMINATION DEVICE AND IMAGE DISPLAY DEVICE EMPLOYING THE SAME - The object of the present invention is to achieve weight reduction of an illumination device and uniformization of luminance distribution. The illumination device (backlight unit) comprises a linear light source, a reflecting layer and an outlet layer. The reflecting layer and the outlet layer face each other via space. The linear light source is arranged at an end of the space. The outlet layer is formed as a semi-transmissive layer which transmits part of incident light while reflecting part of the incident light. The cross-sectional shape of the reflecting layer has an apex, which is concave in an illuminating direction, in a section from a position close to the linear light source to a central position of the reflecting layer and an inflection point in a section from the apex to a distal end of the reflecting layer. | 09-13-2012 |
20120327391 | DISPLAY APPARATUS - A display apparatus is provided which, when projecting a video onto a curved surface of an object for display, can realize an undistorted display of the video. The measuring means outputs the distance information representing the distance to the object. Based on the distance information produced by the measuring means, the curved surface contour is detected with high precision. According to at least the detected curved surface contour distortions, pixels of the display image are unevenly rearranged to correct the video information before it is output. This arrangement realizes an undistorted display of video when the video is projected onto the curved surface of the object. | 12-27-2012 |
20130107224 | Optical Unit | 05-02-2013 |
20130169905 | BACKLIGHT DEVICE AND LIQUID DISPLAY APPARATUS USING THE SAME - A backlight device, for irradiating lights on a liquid crystal panel, comprises plural numbers of backlight blocks, each backlight block has a sheet-like reflection member ( | 07-04-2013 |
20130201459 | LASER PROJECTOR - A laser projector includes a laser light source to emit laser light modulated in accordance with image information, a scanner to drive the laser light along two axes in horizontal and vertical directions and make scanning two-dimensionally with the laser light, a scanning mirror drive part to produce a drive signal of the scanner, a light source data conversion part to change arrangement in a horizontal direction of data applied to the laser light source and a timing generation part to synchronize the scanning mirror drive part with the light source data conversion part, and a start direction of laser scanning in the horizontal direction is changed every frame of the image information. | 08-08-2013 |
20130278866 | ILLUMINATION DEVICE AND LIQUID CRYSTAL DISPLAY APPARATUS USING THE SAME - A plurality of backlight blocks are configured by being juxtaposed in the plane direction of an illumination device and include a bidirectional backlight block. Light sources are formed on both lateral sides of the bidirectional backlight block in the direction of the axes of emission of the light sources, the light sources formed on one lateral side are arranged so that light is emitted in the direction toward the light sources formed on the other lateral side, the light sources formed on the other lateral side are arranged so that light is emitted in the direction toward the light sources formed on the one lateral side, and the bidirectional backlight block is arranged in the center part of the illumination device in the direction of the axes of emission of the light sources. | 10-24-2013 |
20140015874 | Optical Unit - An optical unit includes a light source that emits light to be projected onto a screen, one or a plurality of optical elements that controls a spread of a beam of light from the light source to the screen, a combining element that combines the light emitted from the light source, and a scanning element. The light source outputs an optical beam that will generate an elliptically shaped beam spot on the screen, the beam spot having a major axis substantially perpendicular to a scanning direction, and the light source is driven with pulse width modulation (PWM) so that one driven pulse corresponds to one beam spot on the screen. | 01-16-2014 |