Abstract:
A device and related fabrication method is provided for an organic/inorganic hybrid optical amplifier with a function of converting infrared light to visible light. The hybrid device integrates an inorganic heterojunction phototransistor (HPT), an embedded metal electrode mirror with a dual function as an optical mirror and charge injection electrode, and an organic light emitting diode (OLED). This integrated optical amplifier is capable of amplifying the incoming light and producing light emission with a power greater than that of the incoming signal. In the second aspect of the invention, the optical amplifier is capable of detecting an incoming infrared electromagnetic wave and converting the wave back to a visible light wave. The optical device has dual functions of optical power amplification and photon energy up- conversion. The optical amplifier device consists of an InGaAs/InP based HPT structure as photodetector, gold-coated metals as embedded mirror and a top-emission OLED. New optical up-conversion imaging devices are also provided that include focal-point array of the organic/inorganic hybrid optical amplifier devices in pixelated formats. The up-conversion imaging devices have a fast response time to enable gated operation for practical applications such as night vision, active surveillance, semiconductor wafer inspection and eye-safe infrared imaging. More importantly, the up-conversion imaging devices would be particularly useful for detecting ultra-low intensity infrared scenes.
Abstract:
The invention provides an electronic paint (10) comprising a lower conductive layer (20), a layer of electrophoretic ink (22) disposed on the lower conductive layer (20), ,a plurality of floating electrodes (24) disposed on the layer of electrophoretic ink (22), a photoconductive layer (26) disposed on the plurality of floating electrodes (24), and an upper conductive layer (28) disposed on the photoconductive layer (26). Light (36) directed onto a portion of the photoconductive layer (26) and a bias voltage (30) applied to the upper conductive layer (28) allow a transfer of a predetermined charge (32) onto at least one floating electrode (24). Activation of the electrophoretic ink (22) is based on the predetermined charge (32) on the floating electrode (24) and a reference voltage (34) that is applied to the lower conductive layer (20).
Abstract:
A thin film transistor having high performance and high reliability by suppressing the OFF current (photoconduction current) during irradiation with light. The thin film transistor comprises a polysilicon semiconductor layer having a channel region, source and drain regions formed on either side of the channel region, and a depletion layer formed between the channel region and the drain region, wherein the width of the depletion layer is proportional to the photoconduction current generated when the channel region is irradiated with light, and the width of the depletion layer is equal to or smaller than a value determined according to the proportional relation in order to control the photoconduction current within a specified allowable range.
Abstract:
A method for encoding information that is encoded in spatial variations of the intensity of light (24) of a first wavelength into light of a second wavelength, the method comprising: generating a first density distribution of electrons homologous with the spatial variations in intensity of the first wavelength light; generating a second additional electron density homologous with the first electron density distribution; trapping electrons from the first and second electron density distributions in a trapping region (34) to generate an electric field homologous with the density distributions in a material (36) that modulates a characteristic of light (22) that passes therethrough responsive to an electric field (46) therein; and transmitting the second wavelength light (22) through the modulating material (36) thereby modulating the second wavelength light in response to the electric field and encoding it with the information.
Abstract:
A spatial light modulator system for adaptive near-field imaging having an optical source for transmitting an optical beam through a filter which is controlled to convert the optical light beam into a filtered optical light beam to define one or more transmission pathways through a photoconductive material is disclosed. The system further includes a terahertz light source for transmitting a terahertz beam through the one or more transmission pathways defined by the filtered optical light beam through the photoconductive material for illuminating and scanning the sample without the use of moving structural components.
Abstract:
본 발명은 터치스크린 내장형 액정 표시 패널에 관한 것으로, 특히 블랙 매트릭스의 상면에 액정 표시 패널 상에서 터치가 발생하는 위치를 식별하기 위한 광도전 소자(CDS 셀)가 형성된 터치스크린 내장형 액정 표시 패널에 관한 것이다. 이에 따라서, 액정 표시 패널 상에서 터치가 발생하는 위치를 식별하기 위한 센서가 외부로 노출됨으로써 발생되는 센서의 오염 및 파손에 따른 오작동을 방지하여 제품의 신뢰성을 향상시킬 수 있고, 제조공정이 간단하여 제품의 생산성을 향상시킬 수 있다.
Abstract:
For obtaining a light modulator (1) for modulating light which can be addressed without the need for an active or passive matrix and in which it is relatively easy to realize a light transmissive mode of operation, the light modulator (1) has a light modulating element (2) having a light outcoupling surface (91) for coupling out the modulated light, an electrophoretic medium (5) comprising charged particles (6), an optical state depending on a position of the particles (6), an element (17) being able to be addressed by an output of an energy source for allowing a movement of the particles (6) to their position for modulating the light as a consequence of an electric field applied to the light modulating element (2). In one aspect, the applied electric field and the medium (5) are arranged for the movement to have a component in a plane parallel to the light outcoupling surface (91). In another aspect, a colour filter is used to reduce the sensitivity of the element to ambient light.
Abstract:
A reflective type liquid crystal optically addressed spatial light modulator has a first transparent substrate(1b), a first transparent electrode (2b) formed on the first transparent substrate (1b), and a photosensitive layer (3) formed on the first transparent electrode, formed from materials including hydrogenated amorphous silicon carbide (a-Si:C:H). A read-out light-blocking layer (4) is formed on top of the photosensor layer (3) and is formed from amorphous hydrogenated carbon (a-C:H). The high reflectance dielectric multilayer mirror (5) is formed on top of the light-blocking layer (4) and can be made of alternating the a-Si:C:H layers with a higher refractive index and the a-C:H layers with lower reflective index. The modulator also has a second transparent substrate (1a), a second transparent electrode (2a) formed on the second transparent substrate (1a), and a liquid crystal layer (8) disposed between the dielectric mirror (5) and the second transparent electrode (2a). The invention allows more efficient separation of the input and read lights and increases the read light reflection, resulting in improvements to the input sensitivity, resolution, contrast ratio, and diffraction efficacy.