108 results about "Relative luminance" patented technology

An OLED display system includes a) an OLED display including an array of light emitting pixels, each pixel having a plurality of OLEDs for emitting different colors of light specifying a gamut wherein one of the OLEDs has a power efficiency or lifetime different from the power efficiency or lifetime of at least one of the other OLEDs; b) a control signal; and c) a display driver for receiving a color display signal representing a relative luminance and color to be produced for each pixel of the display and generating a converted color display signal for driving the OLEDs in the display, wherein the display driver is responsive to the control signal for controlling the color gamut saturation of light produced by the OLEDs to reduce power consumption or increase lifetime of at least one of the OLEDs.

A scanning backlight (70) for a display, the backlight having a number of sections separately illuminated, a controller (20) to control the illuminating of the different sections at different times, and to control relative luminance levels of the different sections, and the backlight having a sensor (60) to detect a spectrum of the lighting, the controller being arranged to control a color of the illuminations of the different sections according to the detected spectrum. This combination can enable the color output to be maintained accurately without needing an external spectrometer, and control the uniformity of color in the different sections. This control can enable the specifications of any parts used to illuminate the sections to be relaxed, such as temperature and aging specifications, to keep the costs lower.

An OLED display system includes a display device having an array of light emitting pixels, each pixel having a plurality of OLEDs for emitting different colors of light specifying a gamut and at least one additional OLED for emitting a color of light within the gamut, wherein the power efficiency of the additional OLED is higher than the power efficiency of at least one of the plurality of OLEDs; means for generating a control signal indicating an amount of contribution to the light output of the display provided by the additional OLEDs; and a display driver for receiving a standard color image signal representing relative luminance and color to be produced for each pixel of the display and generating a converted color image signal for driving the OLEDs in the display, the display driver being responsive to the control signal for controlling an amount of light produced by the additional OLEDs such that the power efficiency of the display may be increased and/or the rate of degradation of the display device may be decreased.

An OLED display system includes an OLED display including an array of light emitting pixels, each pixel having a plurality of OLEDs for emitting different colors of light specifying a gamut and including at least one additional OLED within the gamut defined by the other OLEDs and wherein one of the OLEDs has a power efficiency or lifetime different from the power efficiency or lifetime of at least one of the other OLEDs; a control signal; and a display driver for receiving a color display signal representing a relative luminance and color to be produced for each pixel of the display and generating a converted color display signal for driving the OLEDs in the display at the relative luminance and color, wherein the display driver is responsive to the control signal for controlling the in-gamut mixing ratio of the OLEDs to reduce power consumption or increase lifetime of at least one of the OLEDs.

A display device according to the present invention includes pixel units. Each of the pixel units is made up of N consecutive pixels. One of N (N≧3) colors including R (red), G (green) and B (blue) is assigned to each of the N pixels. Each of the N pixels includes a sampling transistor Ms, drive transistor Md, holding capacitor Cs and light-emitting element (organic light-emitting diode OLED). Of the N pixels, a specific color pixel that is susceptible to a dark dot (e.g., B) or that has the highest relative luminosity factor (e.g., G) has more sets of pixel circuit elements including the drive transistor Md, holding capacitor Cs and organic light-emitting diode OLED than other color pixels and has two or more sets thereof.

The present invention relates to a method and an apparatus for adaptive compensation of chrominance, aiming at the optimization of colors of electronic images. The invention includes the experimental data obtained when the best viewing effects are achieved, the division of color-gamut cells according to visual characteristics, the preset compensation characteristics that have different amplifications for different color-gamut cells, the real-time recognition of color-gamut cells that the signals belong to, and appropriate compensation that is done according to the color-gamut cells. The characteristic of the compensation is that each pixel gets its own amplification dynamically, which makes the dominant wavelength, chroma and relative brightness of all the image colors meet the requirement of best self-adaptive color reproduction automatically. As a result, colorful images with high qualities can be acquired. The present invention eliminates the local inferior chrominance distortion that inevitable for existing products and improves the equipment's adaptability to the receiving environments.

A method to detect the acute biology toxicity by the photobacterium is to prepare the new photobacterium culture firstly, then to adjust the pH of tested water: the pH is 4.5 when the Cu density is higher than other metal and organic matter; the pH is 5.4 when the water sample does not contain Cu and other metal density is higher than the organic matter; the pH is 7.0 when the organic matter in water is higher than metal density. The ZnSO4 is as reference toxicity and matching a series of standard solution which are set in tube which is added in the photobacterium culture and detect the relative luminance. The luminance change of test water is expressed by the relative luminance. The computing formula is: the sample relative luminance = sample tube luminance/reference tube luminance. The invention uses the photobacterium not the toxicity to detect the acute biology toxicity of water.

A method and apparatus is disclosed which can reproduce multi-value data with high reproducibility from a hologram recording medium having data recorded in multi-values therein and can reduce the error rate of reproduction data. A reference gradation pattern is recorded in a medium, and luminance unevenness of a gradation pattern obtained by reproducing the gradation pattern is corrected. A gamma characteristic of the medium is determined based on the reproduction gradation pattern, and a modulation pattern produced using easily separable luminance values determined based on the gamma characteristic is displayed on a spatial light modulator to record data in multi-values into the medium. Thereupon, the data are oversampled and recorded, and a block of the reproduced data is decoded depending upon a sequence of relative luminance levels of pixels in the block to decode the entire reproduced multi-value data.

Brightness and color tone shift distortion of captured images by a non-ideal lens can be compensated by applying an inverse transfer function to the captured image. An estimate of the lens transfer function can be measured based on a radius from a center of the lens. The lens transfer function can be measured by capturing a flat field image. The center of the lens can be determined based on a relative brightness maximum. The relative brightness of the captured flat field image can then be measured as a function of radius to generate a lens response curve. Separate response curves can be measured for each color component. A correction curve can be determined as the inverse of the response curve. The correction curve can be applied to subsequent captured images to compensate for lens degradation.

A lighting apparatus includes a combination of LED dice that emit light of a first color and a wavelength-shifting material (e.g., phosphor) that converts light of the first color to light of a second color. An appropriate combination of light of the first color and light of the second color can be used to produce light of a target color. In an embodiment, LED dice in the lighting apparatus are divided into two groups. Each LED die in the first group is combined with less wavelength-shifting material than needed to produce light of the target color, while each LED die in the second group is combined with more wavelength-shifting material than needed to produce light of the target color. As a result, the two groups produce light having colors on opposite sides of the target color in the International Commission on Illumination (CIE) chromaticity diagram. In some embodiments, the target color and color variations of both groups are on one straight line in the CIE chromaticity diagram, although it is to be understood that there might be small scattering within the groups. By adjusting the relative brightness of the two groups, the target color can be obtained.

The invention provides a multi-exposure image fusion method based on wavelet transform. A relative luminance relationship between pixels is described using maximum and minimum images of a brightness mean, and the relative luminance relationship is introduced into exposure moderation weight calculation to avoid brightness flip of a fused image and improve the overall contrast of the fused image; according to the method, hierarchical wavelet transform is carried out on a luminance component, an exposure moderation weight graph and a contrast weight graph, weight fusion is carried out on an approximate subgraph of the image luminance components by using the approximate subgraph of the exposure moderation weight graph, the weight fusion is carried out on a detail subgraph of the image luminance components by using the approximate subgraph of the adjusted contrast weight graph, details of different scales are enhanced in different scales, therefore areas on both sides of a strong edge of the fused image can be well exposed while the detail contrast is improved, and loss of the details is avoided.

A white-light-emitting electroluminescent device includes light-emitting elements for emitting different colors of light, wherein one of the light-emitting elements has a luminous efficacy greater than the luminous efficacy of at least one of the other light-emitting elements. The different colors of light combine to form white light. Also included is a driver for receiving a color signal representing a relative luminance and color produced by the electroluminescent device. The driver is responsive to a converted control signal when controlling the color accuracy of the light produced by the light-emitting elements to ultimately reduce the power consumption of the white light-emitting electroluminescent device.

The invention provides a gamma curve adjusting method and device and a display device. The gamma curve adjusting method comprises the following steps: setting N testing gray scales; adjusting until a corresponding chromaticity coordinate of each testing gray scale is in a corresponding preset chromaticity coordinate range and detecting actually measured brightness corresponding to each testing gray scale; obtaining an actual gamma curve according to the testing gray scales and the actually measured brightness; and when the testing gray scales are greater than or equal to a first preset gray scale or smaller than or equal to a second preset gray scale, adjusting red gamma voltages corresponding to the testing gray scales so that an absolute value of difference between the corresponding actual relative brightness of the testing gray scales and the standard relative brightness of the testing gray scales is smaller than preset brightness difference. By the gamma curve adjusting method and device and the display device in an embodiment of the invention, the gamma curve can be corrected, and requirements of chromaticity coordinates can be met.

The invention discloses a method for detecting the acute toxicity of water environment by using ATP bioluminescence. The method comprises the following steps: an ATP reaction reagent, luciferase, an ATP standard sample, and a water body to be detected are sequentially added in a reaction test tube, placing the reaction test tube in an ATP fluoroscope testing instrument to detect fluorescence intensity, the detection response time is 30s and the detection is served as an experimental group; the standard sample is replaced by distilled water, the detection is served as a control group; the experimental group and the control group are repeatedly detected for three times; and the toxicity of the water body is judged by calculating relative luminance K. The method of the invention has the characteristic of stable and sensitive test effect; and the effect of a luminescent bacteria test can be reached within 3 min of the testing time at most; and the response on organic toxic substances is more sensitive than the luminescent bacteria. In the invention, a portable ATP handholding instrument with a direct current power supply is adopted, thus the ATP handholding instrument is convenient to be carried and is suitable for site test.

Driving circuit for plasma display device and a gray scale implementing method therefor are provided. The method includes the steps of (1) dividing total horizontal lines of one frame into XxY subframes according to a relative luminance ratio, (2) dividing each frame into X subfields and allotting Y different subframes to each subfield, and (3) supplying corresponding gray scale data while sequentially erasing each XxY horizontal lines during one horizontal period from the first horizontal electrode lines to the last Nth horizontal electrode lines, included in Y different subframes allotted to each subfield by repeatedly driving X subfields and scanning the same, thereby implementing a display picture of 2XxY gray scales. At least two scanning and sustaining drivers are provided, and one frame is divided into one or more subfields by the drivers, different subframes are allotted to each subfield and then X subfields are repeatedly driven. In other words, since a plurality of horizontal lines to be scanned at a time in a sub-frame method are separately scanned, the overall scanning frequency is decreased. Thus, gray scales exceeding 256 levels can be easily implemented under a stabilized system. Also, flickers caused by the sub-field method can be eliminated. Further, luminance and contrast of a display picture can be improved.

The embodiment of the invention provides a mosaic removing method and device, and relates to the technical field of image processing. The mosaic removing method improves the color reproduction effect of pixels and is better in pixel actual color restoration effect. The method comprises the steps that gradients of a current position pixel in a plurality of preset directions are obtained and a gradient threshold is determined according to the gradients in the preset directions; relative luminance component information of the current position pixel is determined; according to the relative luminance component information of the current position pixel, color values of the current position pixel in various target directions are obtained, wherein the target directions are the directions, where the gradients of the current position pixel are smaller than the gradient threshold, in the preset directions; according to the color values of the current position pixel in all the target directions, an average color value is calculated; according to known color component values of the current position pixel and the average color value of the current position pixel, missing color component values of the current position pixel are obtained; according to the known color component values and the missing color component values, the current position pixel is output.

The invention relates to a method for generating the graph of sunlight normalized distribution on concave-convex ground, by computer. It comprises: based on GIS, it uses the sun altitude angle/azimuth angle, the digital map (digital ground mode) and the geography coordinate (latitude and longitude) at each point, to use computer point-to-point calculate the sunlight ground irradiate factor at each point of digital map; at last, transforms the sunlight ground irradiate factor at each point into the sunlight distribution map. The inventive sun light distribution map can express the sunlight relative luminance at each point of natural ground that affected by the landform; it can be used in the landform effect correct of sunlight of remote sensing graph, the prediction of radar detecting effect, digital simulation, etc.

A transmittance adjuster unit includes multiple transmittance adjusters arranged in a predetermined pattern, if the pattern density is ρ(x, y), the maximum luminance F_max of the light emitted from the light emission plane of a planar illumination device when the unit is not provided is 1, the minimum luminance is F_min, and the relative luminance with respect to the maximum luminance F_max of the light emitted from a predetermined position (x, y) of the emission plane is F(x, y), the relationship between the luminance F(x, y) and the pattern density ρ(x, y) satisfies the following expression: ρ(x, y)=c{F(x, y)−F_min}/(F_max−F_min), wherein 0.5≦c≦1. This unit is thin and lightweight, and can reduce unevenness of the luminance without reducing the average luminance of the incident light. The planar illumination device includes the transmittance adjuster unit and a liquid crystal display device includes the planar illumination device.

An image sensing system comprises an image sensor having an image sensing surface, a filter arranged between the image sensing surface and an optical system which forms an image of an object on the image sensing surface, a sensor configured to detect a luminance of the object in a band in the vicinity of a cutoff wavelength of the filter relative to an average luminance of the object via the optical system, and a corrector configured to execute color shading correction of the image, sensed by the image sensor, using a color shading correction coefficient determined by the relative luminance detected by the sensor.

The invention discloses an accurate dimming method and system for an ultra-three-color LED light source. Firstly, the chromaticity and the brightness of the target light color are set; then a spectralradiometer is utilized to measure the absolute tristimulus value of each light color LED, and the brightness coefficient is calculated to complete the establishment of calibration data; a linear programming model is constructed and solved so as to obtain the normalized brightness initial matching coefficient; the normalized brightness initial matching coefficient is further processed according tothe set target brightness value so as to obtain the final normalized brightness matching coefficient; and the control signal value of each light color LED is obtained by the normalized brightness matching coefficient and the calibration data and further corrected so as to realize the set target light color. The spectral data of the LED light source are not involved in the dimming process, and thedefect that the brightness of the target light color can only be absolute brightness or relative brightness can be overcome and receiving target light colors in various representations is allowed, and thus the amount of data is low and an effective dimming method for realizing applications such as intelligent lighting and dynamic lighting can be provided.