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4409 results about "Light modulation" patented technology

Liquid crystal display apparatus

The video display apparatus has a light modulation device for forming a picture in accordance with a video signal and a lighting unit for irradiating, on the light modulation device, illumination light necessary to cause it to display the picture. In the apparatus, the lighting unit irradiates the illumination light in sequence of individual plural illumination light source partitive areas, a luminance distribution calculating unit calculates luminance distributions of video signals corresponding to the plural partitive areas to determine illumination light luminance levels of the individual partitive areas, an illumination controller controls rays of the illumination light of individual areas of the lighting unit on the basis of determination by the luminance distribution calculating unit, and a video corrector corrects the video signal inputted to the light modulation device on the basis of the determination by the luminance distribution calculating unit.
Owner:PANASONIC LIQUID CRYSTAL DISPLAY CO LTD +1

Phototherapeutic treatment methods and apparatus

A thin film electroluminescent (TFEL) phototherapy device based on high field electroluminescence (HFEL) or from organic light emitting devices (OLED), consistent with certain embodiments of the present invention has a battery and a charging circuit coupled to the battery, so that when connected to a source of current acts to charge the battery. A TFEL panel produces light when voltage from the power source (battery or AC source) is applied. A processor such as a microprocessor is used to control the application of voltage from the power source to the TFEL panel under control of a control program. A housing is used to contain the battery, the charging circuit and the processor and carry the TFEL panel on an outer surface thereof. In one embodiment, the housing incorporates a removable cover that uncovers a household electrical plug useful for supplying charging current to the charger. In use, a method of carrying out phototherapy, consistent with certain embodiments of the invention involves diagnosing a condition of an affected area of tissue that can be treated with phototherapy. A treatment protocol is determined including, for example, a treatment light intensity, a treatment time, a light modulation characteristic and a treatment light wavelength suitable for treating the condition. The affected area is then irradiated with light from the TFEL panel in accord with the treatment protocol.
Owner:INT TECH CENT

Active matrix oled voltage drive pixel circuit

There is provided a circuit for driving a current mode light modulating device. The circuit includes (a) a capacitor for storing a data voltage, (b) a field effect transistor (FET) controlled by a signal on a scan line, for coupling the data voltage from a signal line to the capacitor, and (c) a current source, controlled by the stored data voltage, for driving the device with current provided from a power line. The power line is in a plane that is geometrically parallel to a plane within which the scan line is located.
Owner:INNOLUX CORP

Method of using a retarder plate to improve contrast in a reflective imaging system

Methods and apparatus for enhancing the performance of a reflective liquid crystal display system. The high-contrast color splitting prism system utilizes a "double-passed" prism assembly. Polarized light enters the prism assembly, is color-split and emitted as separate colors to spatial light modulators which reflect each color in accordance with a desired image. The reflective light is passed, once again, through the prism assembly where the separate colors converge and propagate to a projection lens for display of the image on a screen. A waveplate retarder is positioned between the liquid crystal display and the polarizing element. The waveplate retarder is tilted with respect to the optical axis to eliminate the deleterious effects of the Fresnel reflections at the interfaces of the waveplate retarder.
Owner:JDS UNIPHASE CORP

Display Device

InactiveUS20070268241A1Manufacturing variation can be decreasedImprove output accuracyStatic indicating devicesLiquid-crystal displayDisplay device
An ambient light sensor 10 and a backlight sensor 9 are located on the liquid crystal panel 6 adjacently to each other, for correcting a variation of an output characteristic of the ambient light sensor 10. This location keeps the manufacturing variation of each liquid crystal panel 6 even in these two light sensors 9 and 10. A degree of variation of an output of the backlight sensor 9 for sensing a ray of backlight from a backlight module relative to a predetermined reference value is detected. Based on the detected result, the output of the ambient light sensor 10 is corrected. This operation makes it possible to improve sensing accuracy of the ambient light sensor 10 and keep the light modulation even in each liquid crystal panel provided with the ambient light sensor 10.
Owner:PANASONIC LIQUID CRYSTAL DISPLAY CO LTD +1

Silicon substrate as a light modulator sacrificial layer

ActiveUS7027202B1Increase local etch rateIncrease local etching rateDiffraction gratingsXenon difluorideBand shape
An optical MEM device is fabricated with a patterned device layer formed on a silicon wafer. Preferably, the patterned device layer is patterned with plurality of ribbons and / or access trenches. The central portion of the ribbon is released from the silicon wafer using a selective etch process, wherein a cavity is formed under the central portion of the ribbon, while opposing ribbon ends remain attached to the wafer. The selective etching process preferably utilizes an enchant comprising xenon difluoride. In accordance with further embodiments, the silicon wafer is doped, patterned or otherwise modified to enhance the selectivity of the etching process.
Owner:SILICON LIGHT MACHINES CORP
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