107 results about "Standard illuminant" patented technology

The invention discloses a textile color difference detection method based on image data, and relates to the technical field of image processing and computer vision, and the method comprises the following steps: S1, collecting an image of a textile with a high reflection characteristic under a standard light source, constructing a light intensity prediction model, and carrying out the analysis based on pixel brightness distribution, identifying a brightness abrupt change region and a saturation critical region, and generating an image-level saturation risk probability graph; s2, performing multi-scale exposure area division on the image based on the image-level saturation risk probability graph, setting a target brightness range of each exposure control sub-area, and recording a global exposure parameter of the image acquisition equipment as an initial baseline of exposure scheduling; according to the method, pixel-level brightness convergence is realized through light intensity prediction and area exposure control, real color distribution is reconstructed in combination with color compensation, and a closed-loop process is constructed by introducing model self-correction, so that the detection precision and consistency of the micro chromatic aberration of the high-reflective fabric are improved, and the automation and industrial applicability are enhanced.

The invention discloses a high-precision electronic tooth colorimeter. The high-precision electronic tooth colorimeter comprises a standard light source, an optical fiber probe, a color sensor, an intelligent programmable chip and a liquid crystal display screen, a standard light source and optical fiber color picking technology is adopted, the stability and consistency of the light source are ensured, and ambient light interference is avoided. The color sensor collects RGB original data of tooth reflected light and converts the RGB original data into data of an HSL color space, and the intelligent programmable chip automatically matches the closest color number through an Euclidean distance algorithm of the HSL color space. The system supports an intraoral mode and an extraoral mode, adapts to different colorimetric requirements, supports input functions of different tooth color plate systems, and is more flexible to use. The colorimetric precision and efficiency can be remarkably improved, the rework rate is reduced, the cost is saved, and the satisfaction degree of a patient is improved.

The invention discloses an optical lens coating film defect detection method and system, and relates to the technical field of image processing, and the method comprises the steps: obtaining an image of a coating film surface under the irradiation of a standard light source, and carrying out the preprocessing, and obtaining the coordinate and gray value of each pixel point on a gray-scale image; based on the coordinates and the gray values of all the pixel points, calculating a defect-free background gray estimated value and a local deviation degree of each pixel point on the gray-scale map; calculating a local abnormal fluctuation level of a neighborhood of each pixel point based on the local deviation degree of the pixel points, and generating an illumination invariance threshold value of each pixel point; improving and calculating an LBP feature value of each pixel point based on an illumination invariance threshold; and determining a self-adaptive abnormal threshold based on the LBP feature value of the pixel point, and identifying an abnormal region based on the self-adaptive abnormal threshold to obtain the position and area of the defect. According to the method, the problem that defect features are difficult to accurately extract on the surface of the high-reflection coating can be solved, and coating defects can be accurately recognized.

The invention belongs to the technical field of detection of headlight detector calibrators, and particularly relates to a headlight detector calibrator intelligent traceability evaluation system based on CCD visual perception, which comprises a screen support assembly and a sample standard light source, the screen support assembly is placed on the ground, the right end of the screen support assembly is connected with a high-precision illuminometer module, and the right end of the high-precision illuminometer module is connected with the sample standard light source. The high-precision illuminometer module is used for carrying out image acquisition and processing on a light source irradiated by the sample standard light source, the right end of the screen support assembly is provided with the multi-dimensional table assembly, and the upper end of the surface of the multi-dimensional table assembly is provided with the sample standard light source. The problems that in traditional light source detection, light spot detection is prone to noise interference in a complex environment, and consequently positioning failure is caused can be solved; when light spot forms are variable, a traditional segmentation algorithm is poor in universality; centroid positioning ignores light intensity distribution and is insufficient in precision; uniformity analysis depends on manual sampling, and defects cannot be fed back in real time.

The invention relates to the technical field of spectrograph calibration, in particular to a spectrograph spectrum calibration and radiometric calibration method. According to the technical scheme, the method comprises spectrum calibration and radiometric calibration, the spectrum calibration comprises the steps that firstly, a standard light source is adopted for conducting initial spectrum calibration on an uncalibrated spectrometer to obtain an initial spectrum calibration equation, and then optical differential thickness data is obtained through a sample gas measurement experiment and combined with standard gas absorption cross section data; and calculating a wavelength difference value to correct the initial spectrum calibration equation to obtain a final spectrum calibration equation. The wavelength absolute error precision after spectrum calibration is improved by nearly one order of magnitude, the radiometric calibration error is greatly reduced, the stability and accuracy of radiometric calibration are remarkably improved, the problems that a traditional calibration method is limited in spectral line, poor in light source stability and large in extrapolation error are effectively solved, and the method is suitable for popularization and application. And a solid guarantee is provided for high-precision application of the spectrograph in the fields of environmental monitoring, material science, remote sensing technology and the like.

The utility model discloses a self-calibration multi-grating monochromator. The self-calibration multi-grating monochromator comprises a self-calibration assembly, a grating spectrum system assembly and an optical receiver. The self-calibration assembly comprises a focus lens, a standard light source and a single-face reflector. And the standard light source is used for emitting a light beam with a specified wavelength to the single-sided reflector. And the single-sided reflector is used for reflecting the light beam to the focus lens, and the light beam is focused to the incident end of the grating spectrum system assembly through the focus lens. According to the utility model, an automatic calibration structure composed of the standard light source and the single-sided reflector is arranged at the incident end of the grating spectrum system assembly, so that the monochromator can emit a light beam with a specified wavelength through the standard light source when being used for a long time, and automatic calibration of the grating spectrum system assembly is realized in cooperation with the light receiver. Besides, the single-sided reflector is installed on the sliding rotary table, so that the single-sided reflector gives way when the grating spectrum system assembly is normally used, and interference with external light is avoided when the grating spectrum system assembly is normally used.

The invention discloses a printing process effect measuring method and device for hologram paper and printed matter thereof, and the device comprises a detection box, the top of the detection box is provided with a standard light source, and the bottom of the detection box is provided with a detection table; the bending mechanism is located in the detection box, and the bending mechanism is located on one side of the detection table and used for bending and recovering the flattened hologram paper and printed matter of the hologram paper; the detection mechanism is located in the detection box, can move along the direction parallel to or perpendicular to the detection table, and is used for collecting color values of the hologram paper and the hologram paper printed matter, and collecting an image of the hologram paper printed matter and an image of the standard sample for comparison; the sample covering mechanism is located on one side of the detection box and comprises an adjusting device and a sample covering piece arranged on the adjusting device, and the sample covering piece is parallel to the end face of the detection table. The method and the device can be used for measuring the color value of the laser paper and evaluating the finishing process effect of the laser printed matter at the same time.

The invention discloses a non-contact textile color fastness automatic rating method and device, and relates to the technical field of textile detection. A textile image is collected under a D65 standard light source through an industrial color camera, after preprocessing such as bilateral filtering, self-adaptive contrast enhancement and linear brightness adjustment is carried out, in combination with fiber material characteristics, fabric structure characteristics and environmental factor data, a color change and staining model built by a multi-layer sensor is used for training, and a color change and staining model is obtained. And converting the RGB value into a CIELAB value to calculate a color difference value, selecting coefficients according to different conditions to calculate a color fastness value, and finally rating according to a standard and generating a report. According to the invention, high precision, high reliability and automation of color fastness detection are realized, errors are effectively reduced, the detection efficiency is improved, the cost is reduced, and the method has good universality for different types of textiles.

The utility model provides a kind of optical intensity adjustable optical filter switching device, belong to filter production technical field, including support assembly, including base, the support table of rotation connection in base end part, the support rod of fixed connection in support table end part and the connecting column of fixed connection in support table center;Switching assembly, including fixed mounting in the connecting piece of connecting column end part, hinged in the connecting piece end part link, the extension rod of insertion in link end part, the clamping block of fixed connection in the extension rod end part and the filter frame body of clamping in the clamping block end part.The utility model has the beneficial effects of: realize the flexible control of filter in three-dimensional space, can be adapted to the optical path demand of different light source, different detection equipment, expand applicable scene, shorten filter switching time, can be quickly completed filter loading and unloading, without other auxiliary tools, improve the efficiency of multiple filter alternate test.Auxiliary lamp panel provides standard light source, without external device can be completed filter light transmission performance test.

To provide a laminated film improved in adhesion while having good optical characteristics, and a method for manufacturing the laminated film.SOLUTION: The laminated film 1 of the present invention includes a base film 2, a cured resin layer 3 disposed on one surface in the thickness direction of the base film 2, and an inorganic material layer 4 disposed on one surface in the thickness direction of the cured resin layer 3. The ratio of the ion intensity of the C3H3O2 fragment to the ion intensity of the HSi2O5 fragment measured by time-of-flight secondary ion mass spectrometry is 1.0 * 10 - 1 or more. In addition, the total reflectance of the laminated film 1 from one side in the thickness direction of the inorganic material layer 4 with respect to irradiated light of wavelengths 380nm to 780nm of a standard illuminant D65 is 0.40% or less.SELECTED DRAWING: Figure 1

The tongue color correction method based on a deep convolutional neural network relates to the field of medical image color correction, and solves the problems of color deviation of tongue image data generated by mobile devices in non-standard light source environment, tongue color image color distortion and the like, and the like.The present application collects picture data under standard illumination with a mobile device, uniformly scales, and enhances data; then collects data under a color-biased light source environment, and uniformly scales. The dataset under the standard light source is trained using a deep convolutional neural network, and the output result of the neural network is given to the downstream to perform a classification task on each pixel point. Each pixel point is converted from an RGB space to an HSV space, the distance of each current pixel point from the nearest point on the HSV space is calculated, the nearest pixel value is taken as a standard value, the RGB value corresponding to the HSV is finally calculated for color space restoration, and finally, tongue image color correction is realized. The present application restores the true color of the tongue image to the greatest extent.

The invention relates to the technical field of dust concentration detection, and particularly provides a photoelectric dust concentration detector for continuously detecting dust concentration in fire and explosion prevention, which comprises a base. The first standard light source emits light with specific light intensity, after the light beam passes through an environment to be detected, the light intensity detector located on the right side can detect the emergent light intensity, meanwhile, the light intensity detector located in the front can detect the reflected light intensity, and then the dust concentration is obtained after calculation is conducted through the calculation component. The second mounting plate and the first mounting plate are rotationally connected through a connecting shaft and are fixed through a manual adjusting bolt, a fixing block, a clamping block and a limiting gear at the same time, a light intensity detector used for detecting the intensity of reflected light can be rotated to different positions, an extension spring is stretched by pulling down an insertion fixing rod, and the upper end of the insertion fixing rod is separated from the interior of an insertion fixing hole. Therefore, the plug board can be moved, the positions of the two light intensity detectors can be adjusted, and the distance between the light intensity detectors and the first standard light source can be changed.

The present invention belongs to the field of testing technology, and specifically relates to an intelligent detection method for visual brightness based on digital imaging technology. Aiming at the problems of large volume, high cost, complex operation of traditional visual brightness measurement instruments, as well as poor accuracy and stability of visual brightness measurement, this method measures visual brightness through steps such as selecting a digital imaging device with adjustable parameters, high resolution and wide dynamic range, matching an adapter lens and a filter, constructing a response function of the digital imaging device, and establishing a conversion relationship between gray values and visual brightness. Specifically, it includes setting parameters of the digital imaging device, photographing a standard light source and establishing a relationship with the target, aligning the target area to acquire images, converting to the gray space for correction and calculating the visual brightness. During the process, the measurement accuracy is also improved by setting white balance, image preprocessing and fusing multiple captured images. This method is easy to operate, low in cost and strong in adaptability, and can effectively improve the measurement accuracy and stability.

This invention discloses a calibration method and device for a spectroscopic laser-induced phosphorescence imaging system. The calibration method includes: selecting a homogenizing plate as a standard light source and placing the emitting surface of the homogenizing plate at the focal plane of the imaging system; setting the acquisition frequency, total acquisition time, and N different exposure times, and acquiring N sets of grayscale images obtained by the imaging system under different exposure times; averaging the pixel values ​​of the N sets of grayscale images to obtain the image grayscale matrix of each set of grayscale images; performing linear fitting using the least squares method on the set of grayscale matrices under the N exposure times to obtain the bias correction matrix and gain correction matrix; and correcting the original response grayscale matrix obtained under the test state based on the obtained bias correction matrix and gain correction matrix.

The invention discloses a portable EBAPS imaging test system, which is characterized in that an integrating sphere with a standard A light source is integrated in a 20-inch luggage case, illumination can be adjusted by adjusting a diaphragm and an attenuation sheet, illumination coverage from 10 <-5 > lx to 10 lx is realized, milk white glass and the integrating sphere ensure uniformity of output illumination, and the portable EBAPS imaging test system has the advantages of high reliability and high reliability. Light enters the black box after illuminating the resolution target plate, interference of external stray light does not exist, the light is converged by the prime lens and is imaged on the EBAPS, the EBAPS and the low-light illuminometer can be switched freely so as to measure the illuminance of the EBAPS, the whole machine is installed on an aluminum honeycomb plate, and the size of the illuminance at the position of the EBAPS can be measured. A single person can carry a common long-distance vehicle so as to realize on-site demonstration of EBAPS imaging performance.

The invention discloses a mechanoluminescence efficiency testing device and method based on an integrating sphere, and the device comprises a standard light source which is used for generating a standard light signal; the integrating sphere is used for collecting optical signals generated by the standard light source and the test sample; the test sample is an elastic film with mechanoluminescence performance, and mechanoluminescence is realized through stretching; the optical fiber spectrometer is used for converting an optical signal output from the integrating sphere into a digital signal; the mechanical load applying device is used for applying tensile acting force to the test sample, so that the test sample is deformed to generate photon emission; in the first working state, the standard light source is arranged in front of the integrating sphere; in the second working state, the standard light source is removed, the test sample is tightly attached right in front of the light inlet hole of the integrating sphere, and the mechanical load applying device is used for applying tensile acting force to the test sample. The mechanoluminescence efficiency testing device and the mechanoluminescence efficiency testing method provided by the invention have universality, and are applicable to different mechanoluminescence materials with stretchability.

The utility model discloses a simple device for calibrating an illuminometer, which relates to the technical field of illuminometer calibration and comprises a calibration box, the calibration box comprises an operating rod, a bearing B and a bearing A are respectively sleeved on the operating rod, and a bearing fixing plate is sleeved on the bearing A; the calibration jig comprises a jig connecting plate arranged in the calibration box, the top of the jig connecting plate is provided with a standard light source, the top of the standard light source is provided with a tester connecting block, the tester connecting block is fixedly provided with a lock catch hook, and the lock catch hook is fixedly connected with the standard light source. A lock catch connecting plate is fixedly installed on the outer side of the standard light source, a lock catch is fixedly arranged on the lock catch connecting plate, and the lock catch is connected with the lock catch hook in a clamped mode. The illuminometer tester is fixed through the tester fixing hoop, the illuminometer tester is prevented from loosening or moving in the calibration process, and balance of the illuminometer tester is guaranteed by supporting the illuminometer tester.

The invention relates to a glass-ceramic article (100) with a disc-shaped, transparent substrate (102) consisting of a glass-ceramic, wherein the substrate (102) has a first surface (110) as the usable side and a second surface (112) opposite the first surface (110) as the underside, wherein the substrate (102) has a transparency of at least 80%, wherein the substrate (102) exhibits a chromaticity shift of incident light of CIE standard illuminant D65 to α=0.05 to α=3 in transmission, wherein a reflective coating (114) with a reflectivity Rvis in the visible spectral range of more than 30%, preferably more than 40%, is applied to the second surface (112) of the substrate (102), wherein the coating (114) has at least three layers (104, 106, 108), wherein a first of the layers (104) that are closest to the second surface (112),a silicon-containing and / or aluminum-containing nitride layer or oxide layer or oxynitride layer with a thickness of 5 nm to 250 nm, a second layer (106) which is furthest apart in the coating (114) from the second surface (112), is a silicon-containing and / or aluminum-containing nitride layer or oxide layer or oxynitride layer, and a third layer (108) consisting of chromium or molybdenum arranged between the first layer (104) and the second layer (106).

The application discloses a method for urine test paper mobile phone image detection and analysis, which comprises the following steps: collecting urine test paper JPEG images under multiple light sources under a standard light source box, taking the test paper image under the D65 light source as a standard image, converging the RGB color performance of the test paper block in the corresponding area of the test paper image under the standard light source to the test paper image under the remaining light source environment, that is, training and obtaining a compensation model, fully considering the test paper color features and the mobile phone camera characteristic features in the model characteristic parameters, ensuring the accuracy of the color correction model by analyzing the maximum value, minimum value and variance of the features during preprocessing, establishing a training TabNet model, fusing multiple regression models such as LightGBM, ElasticNet Regression and Support Vector Regression to optimize the color correction effect, and realizing a strengthened compensation model. Through the color correction of the test paper image by the compensation model, the error caused by the color performance of the urine test paper image affected by the environmental light is reduced, the most real color of the test paper image is restored, the color recognition degree is improved, the accuracy of the test paper detection and analysis is improved, and the model is small and has a fast recognition speed.

The invention belongs to the technical field of sensor correction, and provides an illuminance correction method and an illuminance sensor under the natural light condition of facility horticulture. The method comprises the following steps: respectively determining an initial illuminance compensation coefficient corresponding to each test incident angle of an illuminance sensor under a standard light source; establishing a mapping relation between the test incident angle and the initial illuminance compensation coefficient; determining the illuminance sensor and the current incident angle of light incident to the light sensing surface of the illuminance sensor; acquiring a current measurement value of the illuminance sensor; when the illuminance sensor is placed in the natural light environment and the illumination condition reaches the standard, determining a target illuminance compensation coefficient from the initial illuminance compensation coefficients according to the mapping relation and the current incident angle; and performing compensation processing on the current measurement value based on the target illuminance compensation coefficient to determine a target illuminance value. According to the invention, errors caused by the installation inclination angle or the sun position change of a traditional illuminance sensor can be effectively overcome, and the accuracy of illuminance detection is improved.

The present application discloses a method, device and storage medium for screen brightness correction extraction, which is used to improve the accuracy of pixel brightness extraction. An image of a standard light source is collected by a sampling camera to generate a light source captured image; the screen is lit using the lit image, and an image is collected by the sampling camera to generate a screen captured image; the light source captured image and the screen captured image are subjected to region segmentation; a luminance meter is used to detect the luminance of the segmented regions on the light source captured image and the screen captured image; the grayscale mean data of the segmented regions on the light source captured image and the screen captured image is calculated; a correction coefficient is generated according to the luminance data and the grayscale mean data of the segmented regions; the screen captured image is corrected using the correction coefficient; pixel position correction is performed on the screen captured image after grayscale correction; pixel brightness information extraction is performed on the screen captured image after position correction is completed to generate a brightness extraction result image.

This utility model discloses a rapid peanut seed coat color comparison and sampling device. The core structure includes a cutting blade, a base, a locking mechanism, a contrast color card, and a slot. The cutting blade is connected to the base via a T-shaped moving groove and a sliding locking mechanism, allowing it to slide precisely along the T-shaped sliding groove of the base and locking mechanism. Its cutting surface is used to slice the peanut within the slot. Locking rings on both sides of the base cooperate with the locking mechanism inserts to securely fix the peanut. A contrast color card is embedded above the base, and the edge of the slot has a chamfered bevel to facilitate peanut placement and prevent damage to the seed coat. In use, the peanut is placed in the slot with tweezers. After the cutting blade slices the peanut, the seed coat color can be directly compared using the contrast color card under a standard light source. Magnifying glasses, image recognition software, and other auxiliary tools can be used to improve comparison accuracy and efficiency. This device effectively solves the problems of unstable cutting, easy sample contamination, and inconvenient comparison in existing devices, exhibiting high structural integration and simple operation.

Disclosed are: a stress luminescent material which has an afterglow luminance of 17 mcd / m2 or less at one minute after being irradiated for 20 minutes with light having an illuminance of 200 lx using a standard light source D65; a stress luminescent material which has a composition represented by SrpEuqM1rAl2 + tO4 + u; and a stress luminescent material which has a composition represented by SrpEuqLarM2sAl2 + tO4 + u.

A colorimetric determination device based on color space treatment relates to the technical field of heavy metal detection and comprises a box body, the box body comprises a bottom plate, a back plate and a top plate, and the back plate is arranged on one side of the bottom plate in the length direction; a standard light source is arranged at the bottom of the top plate; a pure-color colorimetric background plate is arranged on the back plate; the bottom plate is provided with a colorimetric tube rack for placing colorimetric tubes, the colorimetric tube rack is provided with a plurality of first placing holes, and the plurality of first placing holes are arranged along the length direction of the bottom plate; a camera bracket for placing a camera is arranged on one side, far away from the back plate, of the colorimetric tube rack. The device is integrated with the standard light source, the colorimetric background plate and the photographing equipment, so that the colorimetric tubes can be loaded and photographed quickly, the detection efficiency is improved, and the colorimetric tubes can be prevented from being confused.

The present invention discloses an optical testing method for cryptographic products, which relates to the field of cryptographic product testing. The cryptographic product to be tested undergoes a protective film test, a light intensity test, and a stability test in a predetermined order. If any of the tests fails, the cryptographic product fails the test. The light intensity test includes: selecting a standard light source, setting different light intensities, and continuously irradiating the hardware cryptographic product at a predetermined angle for a predetermined time; detecting whether there is any color change in the protective film when illuminated; if the color of the protective film changes, outputting a test failure and recording the degree and location of the change; if the color of the protective film does not change, outputting a test pass. The present invention achieves the beneficial effect of solving the problem of reliability testing of cryptographic products under certain lighting conditions.

A method of driving a display device including a variable wavelength LED is provided. The variable wavelength LED is one of a pixel of the device or a plurality of sub-pixels of a pixel of the device, and the display device is programmed to operate using a palette that emits a wavelength [lambda] P using N available primary colors, where each of the N available primary colors is a wavelength that can be emitted by the variable wavelength LED. The variable wavelength LED may be driven in response to N respective sub-fields of a driving condition while emitting light at any of the N available primary color emission wavelengths [lambda] P. The method comprises the steps of: identifying an output signal to be displayed by a pixel or sub-pixel of the display device during a display frame; selecting a pair of two available primary color emission wavelengths of the N available primary color emission wavelengths that can be combined to form the output signal; and driving the pixel or sub-pixel to emit light at the two selected primary color emission wavelengths during two sub-frames within the display frame such that the light emitted at the two selected primary color emission wavelengths during the display frame combines to form the output signal having an output chroma and an output brightness (LO). A method of calibrating the display device comprises the steps of: selecting a pair of two discrete primary color emission wavelengths [lambda] P, each primary color emission wavelength [lambda] P corresponding to a respective sub-field of a driving condition; for the two selected primary color emission wavelengths, calculating respective lightness summed as the standard light source point; and controlling the durations of the respective duty cycles of the two sub-fields driving the two selected primary color emission wavelengths such that the selected primary color emission wavelengths [lambda] P and lightness of the two selected primary color emission wavelength sub-fields are complementary and the sum is a standard light source point.

The invention discloses a white balance method based on sparse representation and an endoscope, the white balance method comprises white balance calibration and white balance correction, and the white balance calibration is realized through the following steps: S1, calibrating n color temperatures: under a light source of the n color temperatures, shooting a standard color card by an imaging system to obtain RGB response values of all colors; taking the chromatic value of the standard color card under the standard illuminant as a target, solving conversion models from the RGB response value of the camera to the standard chromatic value through an optimization method, and respectively recording the conversion models as M1, M2... Mn; s2, selecting k feature models from M1, M2... Mn, and recording the k feature models as Mf1, Mf2... Mfk, klt; n; and S3, adopting an optimization method. According to the white balance method based on sparse representation and the endoscope, white balance under light sources with different color temperatures can be realized, and the white balance method is specifically embodied in the following two points: when the light sources are used for a long time to generate color temperature change, the electronic endoscope can be prevented from generating color cast, and after the light sources of the endoscope are replaced, the whole color can be consistent before and after.

The invention relates to the technical field of traditional Chinese medicine detection, and discloses a lycium barbarum root bark quality rapid nondestructive detection method based on hue angle, which comprises the following steps: collecting reflection spectrum chromaticity signals of the surface of lycium barbarum root bark to be detected in a standard light source environment, and calculating the average hue angle; and substituting the average hue angle as an input variable into a preset functional component prediction model for calculation, and directly outputting the predicted contents of kukoamine A, kukoamine B and total flavonoids in the sample to be detected. The prediction model is a unary linear regression equation constructed based on a large amount of experimental data, and a quantitative mapping relation between the appearance hue angle and the internal chemical component content is determined. According to the method, optical detection is used for replacing traditional chemical analysis, the physical form of a sample does not need to be damaged, no chemical reagent is consumed, rapid, low-cost and objective evaluation on the internal quality of the boxthorn root bark is achieved, and the method is suitable for batch screening and grading of a medicinal material circulation site.

A liquid crystal display according to one embodiment of the present invention is provided with a backlight unit having a blue LED light source and a color conversion sheet, and a liquid crystal panel. When the initial chromaticity of the backlight unit is set as x0 and the chromaticity of the backlight unit after the blue LED light source is turned on for 2000 hours under the condition that the input power per unit area of the liquid crystal display is 170 W / m2 in a temperature environment of 50 DEG C is set as x1, the relationship between x0 and x1 is 0.001 < = x1-x0 < = 0.020. The color conversion sheet contains at least a light-emitting material and a binder resin. The chromaticity (x2) of the liquid crystal panel after light from a CIE standard light source (D65) passes through the liquid crystal panel is 0.335 or less.

The invention provides a display device. The display device comprises a display panel and an anti-reflection film. The anti-reflection film is arranged on the display panel. The anti-reflection film comprises a first high refractive index layer and a first low refractive index layer which are stacked in sequence. A thickness of the first high refractive index layer is greater than a thickness of the first low refractive index layer. Under the irradiation of a CIE standard illuminant D65 light source, the reflected light of the display device meets the following conditions in a CIE L * a * b * color space: 0 > = a * > =-6, and 0 > = b * > =-6. The display device can reduce the reflectivity of ambient light or improve the visual effect.