42 results about "Mesopic vision" patented technology

A method for adapting color appearance of a display (200) for low luminance conditions includes operating a projection (100) to display images on a display surface (30); detecting ambient light conditions and displayed image brightness; determining low luminance conditions based on the detected ambient light conditions and the detected display brightness; determining changes in color appearance to be applied to the displayed images based on the low luminance conditions, a model of photopic vision of the human eye, and a model of mesopic vision of the human eye; and applying the determined changes in the color appearance to image data using an image processor (130) that alters the image data for the projected images.

The invention discloses a spectrum optimization technical method for a high-performance four-chip LED, which comprises: step 1: executing a four-chip LED spectrum light color mixing method; step 2: carrying out spectrum synthesis chromaticity selection of the four-chip LED; step 3: optimizing the lighting effect of the four-chip LED; step 4: optimizing the color rendering of the four-chip LED; step 5: optimizing the radioluminescence efficiency of the four-chip LED; step 6: optimizing the mesopic vision radiant efficiency of the four-chip LED; step 7: optimizing the photobiomodulation of the four-chip LED; and step 8: carrying out comprehensive performance optimization on the radioluminescence efficiency, mesopic vision radiant efficiency and photobiomodulation of the four-chip LED. According to the spectrum optimization technical method for the high-performance four-chip LED, not only can performance on a certain aspect of a four-chip LED light source be optimized, but also the integral performance can be optimized; and meanwhile, a plurality of single-chip LEDs can be optimized to select chips applicable to synthesis of the four-chip LED.

The invention discloses a device for measuring brightness, which comprises a shell, wherein a lens is arranged at an incident port of the shell. Light from the lens is divided into two beams, wherein one beam is received by a first photoelectric detector through an aperture field diaphragm, while the other beam is received by a second photoelectric detector. The first photoelectric detector measures the brightness and spectrum parameters of an aiming point, and the second photoelectric detector can simultaneously display and record illumination information of peripheral environment of the aiming point, and measure image brightness. The device for measuring the brightness has high measurement accuracy, can simultaneously provide brightness values of photopic vision, scotopic vision and mesopic vision, and has the characteristics of complete measurement functions, convenient operation and high repeatability.

The invention relates to a method and experimental device for carrying out vision measurement by adjusting objective and background luminance. According to the method and experimental device for carrying out the vision measurement by adjusting the objective and background luminance, a colorless dull polish film is used as an attenuation sheet to control the luminance of an objective light source, diffuse reflection white foam of high reflectance is used for reflecting changes of the luminance of a background control light source, under the situation that the luminance of the objective light source or the luminance of the background light source in a visual field is maintained to be unchanged, the luminance of one of the objective light source or the background light source is changed in an infinitely variable mode to achieve different objective contrast ratios, a standard logarithmic visual acuity chart is taken as an observation visual standard in a hollow mode, and therefore the vision degrees under contrast ratios of different objectives are measured. The method and experimental device for carrying out the vision measurement by adjusting the objective and background luminance can enable illumination levels under all kinds of visual conditions to be simulated, can quantitatively evaluate the quality of different types of light sources (such as LEDs, high pressure sodium lamps and high pressure mercury lamps) in illumination engineering, and can quantitatively measure the visual degrees of objectives in different illuminating levels (such as photopic vision, scotopic vision or mesopic vision).

A vehicle headlight can facilitate an earlier awareness with peripheral vision under dark environment (such as during nighttime, tunnel, or adverse weather driving). The light source can include a plurality of white LEDs. The plurality of white LEDs include a first white LED and a second white LED. The first white LED has an S / P ratio, which is represented by (S(λ)*V′(λ)) / (S(λ)*V(λ)) in which S(λ) is a spectrum of the first light source, V′(λ) is a relative luminosity factor in scotopic vision, and V(λ) is a relative luminosity factor in photopic vision, lower than that of the second white LED.

An outdoor luminaire comprising a blue LED chip having a maximum peak at a wavelength of 420-480 nm and a phosphor layer disposed forward of the LED chip in its emission direction is provided. The phosphor layer comprises a phosphor of the formula: Lu3Al5O12:Ce3+ which is activated with up to 1 mol % of Ce relative to Lu, the phosphor being dispersed in a resin. In scotopic and mesopic vision conditions, the luminaire produces illumination affording brighter lighting, higher visual perception and brightness over a broader area.

The invention relates to a method and a device for measuring photometric quantity of mesopic vision. In the measuring method, a spectrograph and a photopic vision luminosity probe are used for measuring relative spectral power distribution and photopic vision photometric quantity of measured light respectively; and the absolute spectral power distribution of the measured light is calculated through the relative spectral power distribution and photopic vision photometric quantity so as to calculate the photometric quantity of the mesopic vision of the measured light according to a mesopic vision model. The method can be suitable for any mesopic vision computation model and has higher measurement accuracy. The mesopic vision photometer combines the spectrograph and the photopic vision luminosity probe into measuring equipment, so that the measuring operation of the mesopic vision is convenient and the measuring equipment is suitable for measuring all light sources.

The invention discloses a high color rendering white light LED with a high S / P value, the LED comprises a blue light chip and a fluorescent powder layer used for coating the blue light chip, wherein the fluorescent powder layer comprises green fluorescent powder and read fluorescent powder. According to the high color rendering white light LED with the high S / P value provided by the invention, a color rendering value Ra is more than 80, the S / P value is more than 1.90, and other light quality parameters can also meet the performance requirement of the white light LED based on mesopic vision in existing outdoor illumination.

The invention discloses a brightness meter. The brightness meter comprises a machine shell; light beams to be measured enter into the machine shell through a lens; an ostiole reflector and a photoelectric detector are arranged in the machine shell, a V(lambda) modified color filter and a V' (lambda) modified color filter are arranged in front of the photoelectric detector, and the photoelectric detector respectively measures the photopic vision brightness value and the scotopic vision brightness value of a measure target and obtains a mesopic vision brightness value by calculating. One brightness meter of the invention can measure the photopic vision brightness value and the scotopic vision brightness value conveniently, the mesopic vision brightness value can be obtained through calculation, the operation is simple and convenient, and high-accuracy measurement can be easily realized.

Provided is an LED optimal lighting effect algorithm based on the light distribution principle. Mesopic vision brightness of roadway lighting is combined with ideal human eye vision wavelength and specific distribution of LED spectral wavelength and ambient environment lighting are taken into full consideration so that an optimal lighting effect algorithm can be obtained, natural light in environment is effectively utilized, the algorithm is applied to an LED solid light source, and the best lighting effect can be created on the premise that electric power resources are saved. Electric power resource waste caused by metal halide lamps and high-voltage sodium lamps which are all generally used at present is effectively avoided. Green light influencing the lighting effect can be adjusted according to different requirements of different people, and therefore the LED optimal lighting effect algorithm module can be more user-friendly, and the module can be widely applied to lighting of non-public occasions with vehicle lamps, desk lamps and indoor lamps.

A device that creates non-visible visible-spectrum light comprises of a light source and optics elements that result in irradiated visible spectrum light rays with an intensity that is below a threshold for being visible by a normal observer. For a human observer using photopic or mesopic vision, light rays with an intensity below 3 cd / m2 and 0.003 cd / m2 respectively are not visible. Changes in vision regime used or ambient light, and the addition of irradiated visible light, result in additional visual effects. User and programmable controls can mediate the light source and optics to control the wavelengths and intensities of the light.

The invention discloses a method for detecting a mesopic vision photometric value and a double-photometric detector thereof. The method comprises a step of adopting a photometric detector which is corrected by a photopic vision visual curve, and a photometric detector which is corrected by a scotopic vision visual curve. The method is characterized by measuring background luminance B under a mesopic vision environment condition by a luminance meter during measurement, and finding out the maximum value of luminous efficacy according to the background luminance B, thus determining the proportion of the scotopic vision visual curve and the photopic vision visual curve; and displaying the mesopic vision photometric value under the background luminance by computation according to the proportion of the scotopic vision visual curve and the photopic vision visual curve. The double-photometric detector which is obtained by the method for detecting the mesopic vision photometric value can measure the photometric value under mesopic vision environments, and can correspond with the human eye perception under the mesopic vision environment particularly at the time of designing road lighting, landscape lighting, or lighting of low-luminance trenches and tunnels, thus ensuring the optimum ambient lighting.

The invention discloses a method for detecting a mesopic vision photometric value and a photometric detector thereof. The method comprises the following step: obtaining a set of corrected values by a probe of a detector which is corrected by a mesopic vision visual curve under a determined background luminance, and the method is characterized by performing correction of one mesopic vision visual curve under different luminance conditions for the detector under the background luminance condition of the mesopic vision from 10<-2cd / m2> to 10cd / m<2> to obtain each set of the corrected values, and storing the corrected values in a computer of the detector; and firstly, measuring the background luminance B under a mesopic vision environment condition by a luminance meter when measuring, and finding out the maximum value of luminous efficacy and the corresponding set of the corrected values stored in the computer of the detector according to the background luminance B, thus measuring the photometric value under the mesopic vision condition. The photometric detector which is obtained by the method for detecting the mesopic vision photometric value can accurately measure the photometric value under the mesopic vision environment, and can correspond with the human eye perception under the mesopic vision environments particularly at the time of designing road lighting, landscape lighting, or the lighting of low-luminance trenches and tunnels, thus ensuring the optimum ambient lighting.

The invention provides a high photosynthetic efficiency high-voltage alternating-current white light LED (light emitting diode) module and white light acquiring method in different mesopic vision environments. The LED module comprises a substrate, high-voltage LEDs and an alternating-current drive control circuit, wherein the high-voltage LEDs of preset quantity which are connected in serial are fixed on the substrate; each high-voltage LED comprises a high-voltage blue light chip, a high-voltage orange light chip and an encapsulation layer which is used for encapsulating the high-voltage blue light chip and the high-voltage orange light chip and contains green fluorescent powder; among the serially-connected high-voltage LEDs, the high-voltage blue light chip and the high-voltage blue light chip are connected in series to form a blue light group, and the high-voltage orange chip and the high-voltage orange light chip are connected in series to form an orange group; the alternating-current drive control circuit comprises a bridge-type rectifying circuit, a constant current module and a current adjustable module; the current provided by an alternating-current power supply is divided by the bridge-type rectifying circuit into two circuits, the two circuits of current are respectively supplied to the constant current module to be used as the drive of the blue light group and to the current adjustable module to be used as the drive of the orange light group so as to independently adjust the drive current of each high-voltage orange light chip; the module has ultrahigh mesopic vision light efficiency in different mesopic vision environments.

The invention provides a lamp layout method based on energy conservation and used for an equivalent illumination system for a road tunnel. The lamp layout method comprises the following steps: S1. selecting lamps; S2. determining the transversal rotation angles of the basal planes of the lamps in the tunnel, and taking planes where the transversally-rotated basal planes of the lamps are located asfirst rotation basal planes; S3. determining the longitudinal rotation angles of the first rotation basal planes of the lamps; S4. determining the layout heights of the lamps; S5. determining the transversal layout distances and the longitudinal layout distances of the lamps in the tunnel; and S6. laying out the lamps in the tunnel according to the parameters determined in the steps S1-S5. Through the method, lamp layout is carried out in combination with the characteristic that human eyes are more sensitive to blue-green light under the condition of mesopic vision, by adequately utilizing and exerting the performance characteristics of the lamps, and in combination with an actual environment in the tunnel, so that a safe and comfortable illumination environment in the tunnel can be effectively ensured.

A vehicle headlight can facilitate an earlier awareness with peripheral vision under dark environment (such as during nighttime, tunnel, or adverse weather driving). The light source can include a plurality of white LEDs. The plurality of white LEDs include a first white LED and a second white LED. The first white LED has an S / P ratio, which is represented by (S(λ)*V′(λ)) / (S(λ)*V(λ)) in which S(λ) is a spectrum of the first light source, V′(λ) is a relative luminosity factor in scotopic vision, and V(λ) is a relative luminosity factor in photopic vision, lower than that of the second white LED.

The invention discloses a boundary threshold value test method of mesopic vision and photopic vision of human eyes. The method is characterized in that firstly, a dark room environment is built; an experiment dark room is built inside the dark room environment; light shading curtain cloth is arranged at three sides of the experiment dark room; an external screen is arranged at the other side of the experiment dark room; one side of the external screen is right against a projector; the projector is connected with a computer; vision test program runs on the computer; a round visual target is set through the computer and is projected on the external screen through the projector. A testee sits on an adjustable seat, the lower jaw is supported by a jaw frame; a tester operates the computer; whether the testee sees the round visual target or not is tested according to different brightness and retention time of the round visual target, and different background brightness of the external screen; whether the testee detects the round visual target or not is determined by a medical conventional detection rate method; further, the real response time of the testee for detecting the round visual target is obtained; the critical threshold value of the mesopic vision and photopic vision of the human eyes is obtained.

In a photometry device, photopic vision luminance Lp is measured by a first luminance measuring unit including a first light filter 4 and a first photoelectric converter 5, and scotopic vision luminance Ls is measured by a second luminance measuring unit including a second light filter 6 and a second photoelectric converter 7. A calculation part 8 calculates mesopic vision luminance Lmes based on a measurement value (photopic vision luminance Lp) of the first luminance measuring unit and a ratio of a measurement value (scotopic vision luminance Ls) of the second luminance measuring unit to the measurement value (photopic vision luminance Lp) of the first luminance measuring unit. Consequently, the photometry device can improve measurement accuracy of the brightness (mesopic vision luminance) in mesopic vision.

The invention discloses an aspherical artificial lens capable of completely correcting mesopic vision. The surface shape of the front surface of an optical part of the aspherical artificial lens or the surface shape of the rear surface of the optical part is aspherical. A corneal spherical aberration range corrected by the aspherical artificial lens is -0.1 to -0.2 micron. Compared with an aspherical artificial lens sold in the market at present, the aspherical artificial lens capable of completely correcting mesopic vision is capable of completely correcting the common corneal spherical aberration of the mesopic vision; the influence of eccentricity and inclination of implantation of the artificial lens on the vision quality can be reduced, so that corresponding patients with cataract can obtain higher vision quality.

The invention relates to the technical field of mesopic vision and discloses a high-efficiency double-color dimming LED street lamp based on mesopic vision. A plurality of white-light LEDs and a plurality of blue-green-light LEDs are mixed according to the proportion of 5: 1-10: 1, the main wavelength of the blue-green-light LEDs is 500-510 nm, the color temperature range of the white-light LEDs is 3000-4000 k, and the color rendering index of the white-light LEDs is 65-80; and the lumen output ratio of the white light LED to the blue-green-light LED is 4: 1-8: 1. The efficiency of the streetlamp is greatly improved on the premise that the same brightness is provided for pedestrians at night by the high-efficiency double-color dimming LED street lamp based on mesopic vision.

In a photometry device, photopic vision luminance Lp is measured by a first luminance measuring unit including a first light filter 4 and a first photoelectric converter 5, and scotopic vision luminance Ls is measured by a second luminance measuring unit including a second light filter 6 and a second photoelectric converter 7. A calculation part 8 calculates mesopic vision luminance Lmes based on a measurement value (photopic vision luminance Lp) of the first luminance measuring unit and a ratio of a measurement value (scotopic vision luminance Ls) of the second luminance measuring unit to the measurement value (photopic vision luminance Lp) of the first luminance measuring unit. Consequently, the photometry device can improve measurement accuracy of the brightness (mesopic vision luminance) in mesopic vision.

A personalized optical lens used for nighttime driving and a design method thereof are disclosed. The optical lens has optical performance of an ordinary resin lens, a central optical area can effectively correct a daytime distance vision refractive error of a wearer, and refractive power of a peripheral gradient area is gradually decreased in a radial direction after an optical design. The optical lens of the invention needs to be optically designed based on an optometry prescription containing photopic vision and scotopic vision, and has distinctive individual characteristics, and is particularly suitable for being worn during nighttime driving. The optical lens is mainly aimed at a problem of deepening myopia at night due to factors of dilated pupils at night, increase of whole eye aberration and the like.

A method for measuring the illumination values of fluorescent powder type LED light sources with different color temperatures in the environment of mesopic vision is disclosed. An illumination measuring instrument and a portable background luminance measuring instrument (4) or a portable reflectivity measuring instrument are used, and the illumination measuring instrument comprises an illuminometer probe (1) corrected by a photopic-vision spectral luminous efficiency function, a data processing unit (2) and a display unit (3). The method is characterized by comprising the following steps of: correcting the mesopic vision illumination values of the fluorescent powder type LED light sources with different color temperatures under different background luminance conditions L from 10-3 cd / m2 to 3 cd / m2 to obtain a group of correction factors B, and storing the correction factors B into an internal memory of the illuminometer; during measurement, firstly, measuring the photopic vision illumination values Ev, and then, measuring the actual background luminance value L of the road surface by using the portable background luminance measuring instrument; alternatively, measuring the reflectivity of the road surface by using the reflectivity measuring instrument, and acquiring the background luminance value L corresponding to the illumination of the road surface so as to obtain the corresponding correction factors B; and calculating according to the conversion equation of Emes=B*Ev between the mesopic vision illumination and the photopic vision illumination to obtain the corresponding mesopic vision illumination values Emes. The illuminometer for measuring the mesopic vision illumination values, which is obtained by the method of the invention, can accurately measure the illumination values in the mesopic vision environment and reflect the real mesopic vision illumination values of road lamps observed by human eyes.