An ambient light simulation device with adjustable color temperature and illumination

Abstract

The present invention provides an ambient light simulation device with adjustable color temperature and illumination, which can adjust the color temperature and illumination according to the demand, so as to simulate the ambient light and ensure that the simulation of the ambient light meets the set numerical requirements. It includes: a standard integrating sphere, which includes a sphere body, the sphere body is provided with a plurality of light source fixing holes and a light outlet, an optical measuring instrument measuring port, an opening under a specific angle illumination, and a spectrophotometer fixing hole; a first group of three-color light sources, which includes a low-brightness red light source, a low-brightness green light source, and a low-brightness blue light source; a second group of three-color light sources, which includes a high-brightness red light source, a high-brightness green light source, and a high-brightness blue light source; a halogen light source; a spectrophotometer; and a programmable power supply.

Description

Technical Field

[0001] The invention relates to the technical field of ambient light simulation, and in particular to an ambient light simulation device capable of adjusting color temperature and illumination. Background Art

[0002] With the progress of the times and the development of science and technology, the display industry is developing faster and faster, and the demand is increasing. Therefore, an optical property testing device that can simulate sunlight and ambient light to shine on the screen at a certain angle to test mirror reflectivity, diffuse reflectivity, brightness contrast, ambient light contrast, chromaticity parameters and color gamut area under ambient light, and reflectivity value conversion under different ambient light is urgently needed to be developed. Summary of the invention

[0003] In view of the above problems, the present invention provides an ambient light simulation device with adjustable color temperature and illumination, which can adjust the color temperature and illumination as required to simulate the ambient light and ensure that the simulation of the ambient light meets the set numerical requirements.

[0004] An ambient light simulation device with adjustable color temperature and illumination, characterized in that it comprises:

[0005] A standard integrating sphere, comprising a sphere body, wherein the sphere body is provided with a plurality of light source fixing holes and a light outlet, an optical measuring instrument measuring port, an opening under a specific angle illumination, and a spectral illuminance meter fixing hole;

[0006] A first group of three-color light sources includes a low-brightness red light source, a low-brightness green light source, and a low-brightness blue light source;

[0007] The second group of three-color light sources includes a high-brightness red light source, a high-brightness green light source, and a high-brightness blue light source;

[0008] Halogen light source;

[0009] Spectral illuminance meter;

[0010] and programmable power supply;

[0011] The low-brightness red light source, low-brightness green light source, low-brightness blue light source, high-brightness red light source, high-brightness green light source, high-brightness blue light source, and halogen light source are respectively inserted into the corresponding light source fixing holes, and the light source is placed in the inner cavity of the ball body, the exposed ends of the low-brightness red light source, low-brightness green light source, low-brightness blue light source, high-brightness red light source, high-brightness green light source, high-brightness blue light source, and halogen light source are respectively connected to the corresponding independent power supply output ends of the programmable power supply through corresponding wires, the detection end of the spectroradiometer is connected to one end of the optical fiber, and the other end of the optical fiber penetrates through the fixing hole of the spectroradiometer and then penetrates into the inner cavity of the ball body;

[0012] The programmable power supply outputs the corresponding voltage and current through the built-in software to independently control the low-brightness red light source, low-brightness green light source, low-brightness blue light source, high-brightness red light source, high-brightness green light source, and high-brightness blue light source to adjust in different color temperature ranges. The programmable power supply outputs the corresponding voltage and current to the halogen light source through the built-in software to control the illumination;

[0013] The spectral illuminance meter automatically measures the brightness of the white screen and the black screen under a specified lighting environment according to the color temperature and illuminance in the ball body, calculates the contrast value under ambient light, and draws an illuminance-contrast curve.

[0014] It is further characterized by:

[0015] The outer convex hole of the light outlet has a convex slope, and the product to be tested covers the irradiation area formed by the convex slope. The light emitted from the opening with special illumination is emitted toward the surface of the product to be tested, and then reflected by the irradiation area of ​​the product surface, and then measured by the optical measuring instrument through the measuring port of the optical measuring instrument to obtain the corresponding reflectivity;

[0016] A standard measurement angle is formed between the axis of the receiving light beam formed by the measuring port of the optical measuring instrument and the irradiated surface and the normal line of the irradiated surface;

[0017] The opening under the specific angle illumination is used to inject a light beam with a specific incident angle and corresponding illumination, and is covered with a plug when not in use;

[0018] The measuring port of the optical measuring instrument is used for assembling the optical measuring instrument and for capturing reflected light, and is covered with a plug when not in use.

[0019] After adopting the present invention, red, green and blue light sources are scattered very evenly in the inner cavity of the sphere body after multiple reflections in a standard integrating sphere with a specific chemical coating. The red, green and blue light sources are respectively controlled by independent three-way power supplies, and the halogen light source is controlled by an independent power supply. According to different needs of users, the power supply voltage and current for controlling the red, green and blue light sources can be set respectively, so that the color temperature and illumination values ​​meet the values ​​set by the customer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 This is a geometric diagram of the standard integrating sphere measuring port, light entrance port, and opening under a specific angle illumination of the present invention; the names corresponding to the serial numbers in the figure are as follows:

[0022] Standard integrating sphere 1, low-brightness red light source 2, low-brightness green light source 3, low-brightness blue light source 4, spectroradiometer 5, optical fiber 6, programmable power supply 7, high-brightness red light source 8, high-brightness green light source 9, high-brightness blue light source 10, halogen light source 11, opening under specific angle illumination 12, measuring port of optical measuring instrument 13, light outlet 14, product to be tested 15, light source fixing hole 16, light source baffle 17, spectroradiometer fixing hole 18. DETAILED DESCRIPTION

[0023] An ambient light simulation device with adjustable color temperature and illumination, see Figure 1 , Figure 2 , which includes a standard integrating sphere 1, a first group of three-color light sources, a second group of three-color light sources, a halogen light source 11, a spectroscopic illuminance meter 5, and a programmable power supply 7; the standard integrating sphere 1 includes a sphere body, the sphere body is provided with a plurality of light source fixing holes 16 and a light outlet 14, an optical measuring instrument measuring port 13, an opening 12 under a specific angle of illumination, and a spectroscopic illuminance meter fixing hole 18; the first group of three-color light sources includes a low-brightness red light source 2, a low-brightness green light source 3, and a low-brightness blue light source 4; the second group of three-color light sources includes a high-brightness red light source 8, a high-brightness green light source 9, and a high-brightness blue light source 10;

[0024] A low-brightness red light source 2, a low-brightness green light source 3, a low-brightness blue light source 4, a high-brightness red light source 8, a high-brightness green light source 9, a high-brightness blue light source 10, and a halogen light source 11 are respectively inserted into corresponding light source fixing holes 16, and the light sources are placed in the inner cavity of the ball body, and the exposed ends of the low-brightness red light source 2, the low-brightness green light source 3, the low-brightness blue light source 4, the high-brightness red light source 8, the high-brightness green light source 9, the high-brightness blue light source 10, and the halogen light source 11 are respectively connected to the corresponding independent power output ends of the programmable power supply 7 through corresponding wires, and the detection end of the spectrophotometer 5 is connected to one end of the optical fiber 6, and the other end of the optical fiber 6 penetrates through the spectrophotometer fixing hole 18 and then penetrates into the inner cavity of the ball body;

[0025] The programmable power supply 7 outputs the corresponding voltage and current through the built-in software to independently control the low-brightness red light source 2, the low-brightness green light source 3, the low-brightness blue light source 4, the high-brightness red light source 8, the high-brightness green light source 9, and the high-brightness blue light source 10 to adjust in different color temperature ranges. The programmable power supply 7 outputs the corresponding voltage and current to the halogen light source 11 through the built-in software to control the illumination;

[0026] The spectral illuminance meter 5 automatically measures the brightness of the white screen and the black screen under the specified lighting environment according to the color temperature and illuminance in the ball body, calculates the contrast value under ambient light, and draws an illuminance-contrast curve.

[0027] In a specific implementation, a light source baffle 17 is also provided on the emission path of the emitted light of each light source located inside the spherical body, so that the light is reflected to the inner wall of the spherical body for sufficient reflection and scattering.

[0028] The outer convex hole of the light outlet 14 has a convex slope, and the product to be tested 15 covers the irradiation area formed by the convex slope. The light emitted from the opening with a specific angle of illumination is emitted toward the surface of the product to be tested 15, and then reflected by the irradiation area of ​​the product surface, and then measured by the optical measuring instrument through the measuring port 13 of the optical measuring instrument to obtain the corresponding reflectivity;

[0029] A standard measurement angle is formed between the axis of the receiving light beam formed by the measuring port 13 of the optical measuring instrument and the irradiated surface and the normal line of the irradiated surface. The standard measurement angle in the specific embodiment is 8°.

[0030] The opening 12 under specific angle illumination is used to inject a light beam with a specific incident angle and corresponding illumination, and is covered with a plug when not in use;

[0031] The optical measuring instrument measuring port 13 is used to assemble the optical measuring instrument and to capture reflected light, and is covered with a plug when not in use.

[0032] Its working principle is as follows: a group of red, green and blue light sources with three low brightness ranges are placed in a standard integrating sphere, a programmable power supply is used to control the output of voltage and current, and a spectral irradiance meter is used to read the color temperature and illumination. The software is adjusted according to the color temperature and illumination required by the user and the actual values ​​read by the instrument. The color temperature can be lowered by enhancing blue light and weakening red light, and the color temperature can be increased by enhancing red light and weakening blue light. At the same time, the output of the overall voltage and current can be controlled to achieve the adjustment of the brightness range; in order to meet the requirements of a larger range of ambient brightness, another group of red, green and blue light sources with three high brightness ranges is placed on the integrating sphere, and the programmable power supply is also used to control the output of voltage and current to achieve the adjustment of different color temperatures within the high brightness range; it can simulate sunlight & ambient light to shine on the screen at a certain angle to test the mirror reflectivity, diffuse reflectivity, brightness contrast, ambient light contrast, chromaticity parameters and color gamut area under ambient light, and reflectivity value conversion under different ambient light, etc. Optical property test devices are urgently needed to be developed.

[0033] By setting the built-in software of the programmable power supply, the current and voltage output values ​​of each light source are adjusted through the numerical feedback of the spectrum illuminance meter, and the light source spectrum, the specified color temperature and a specified set of illuminance values ​​set by the user are measured. In addition, the software automatically adjusts the light source to the next set of set values. The external optical measuring instrument automatically measures the white screen brightness and black screen brightness under the specified lighting environment through the optical measuring instrument measurement port, calculates the contrast value under ambient lighting, and draws an illuminance-contrast curve. It can test the WRGB value under different ambient color temperatures and illuminations and calculate the color gamut coverage.

[0034] It uses red, green and blue light sources to be evenly scattered inside the integrating sphere after multiple reflections inside the integrating sphere with a specific chemical coating. The red, green and blue light sources are controlled by three power supplies respectively. According to different user needs, the power supply voltage and current for controlling the red, green and blue light sources can be set separately, so that the color temperature and illumination values ​​meet the values ​​set by the customer.

[0035] Its main application scenario example is to measure diffuse reflection and specular reflection. This reflectivity characteristic parameter can not only simulate the reflectivity of pure illumination under ambient light, but also measure the reflectivity under ambient light of different color temperature and illumination. Mainly includes:

[0036] Specular reflection description: A light source or a D65-like light source is installed in an opening at a specific angle of illumination, and the product to be tested is placed at the light outlet. After the measuring port of the optical measuring instrument is connected to the optical measuring instrument for measurement, the angle between the instrument and the product is equal to the angle between the light source and the product. The optical instrument performs brightness and spectrum measurement, and the measured data is compared with the ambient light value measured under the same conditions and the data of the standard specular reflector, so as to obtain the specular reflectivity of the product to be tested under different color temperature and illumination ambient light;

[0037] Diffuse reflection description: Rotate the integrating sphere light source to the measurement position and then perform the measurement operation in the software. According to the IEC62341-6-2 test standard, some tests need to be performed under pure diffuse reflection ambient light; some tests need to be performed under diffuse reflection ambient light mixed with specular reflection. The measured ambient light numerical standard is compared with the diffuse reflection board data to obtain the diffuse reflectance of the optical product to be tested under ambient light of different color temperature illumination.

[0038] The relationship between illumination and color temperature and the size of the light source and the ball in the simulation device of the present invention is as follows: a small ball is used for high illumination, and 8 inches is commonly used; a large ball is used for low illumination, and 12 inches is commonly used; generally, a large ball has good uniformity, but the illumination is inversely proportional to the ball diameter, and the opening diameter of the ball should be less than 1 / 3 of the ball diameter.

[0039] The use of halogen light source can simulate A light source and light source with color temperature of 6500K, with maximum illuminance of 50000Lux, which can be used for light source control. The spectral irradiance meter test probe is built into the integrating sphere to measure the light source illumination value in real time. The software adjusts the current value of the light source in real time according to the illumination value to keep the brightness (illuminance) output of the light source stable.

[0040] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An ambient light simulation device with adjustable color temperature and illumination, characterized in that: It includes: A standard integrating sphere, comprising a sphere body, the sphere body being provided with a plurality of light source fixing holes and a light outlet, a measuring port for an optical measuring instrument, an opening for illumination at a specific angle, and a fixing hole for a spectral irradiance meter, the opening for illumination at a specific angle being used to inject a light beam with a specific incident angle and corresponding illumination, and being covered with a plug when not in use; A first group of three-color light sources includes a low-brightness red light source, a low-brightness green light source, and a low-brightness blue light source; The second group of three-color light sources includes a high-brightness red light source, a high-brightness green light source, and a high-brightness blue light source; Halogen light source; Spectral radiometer; and programmable power supply; The low-brightness red light source, low-brightness green light source, low-brightness blue light source, high-brightness red light source, high-brightness green light source, high-brightness blue light source, and halogen light source are respectively inserted into the corresponding light source fixing holes, and the light source is placed in the inner cavity of the ball body, and the exposed ends of the low-brightness red light source, low-brightness green light source, low-brightness blue light source, high-brightness red light source, high-brightness green light source, high-brightness blue light source, and halogen light source are respectively connected to the corresponding independent power supply output ends of the programmable power supply through corresponding wires, and the detection end of the spectral irradiance meter is connected to one end of the optical fiber, and the other end of the optical fiber penetrates through the spectral irradiance meter fixing hole and then penetrates into the inner cavity of the ball body; The programmable power supply outputs the corresponding voltage and current through the built-in software to independently control the low-brightness red light source, low-brightness green light source, low-brightness blue light source, high-brightness red light source, high-brightness green light source, and high-brightness blue light source to adjust in different color temperature ranges. The programmable power supply outputs the corresponding voltage and current to the halogen light source through the built-in software to control the illumination; The spectral irradiance meter automatically measures the brightness of the white screen and the black screen under the specified lighting environment according to the color temperature and illuminance in the spherical body, calculates the contrast value under the ambient light, and draws an illuminance-contrast curve.

2. The ambient light simulation device with adjustable color temperature and illumination as claimed in claim 1, characterized in that: The outer convex hole of the light outlet has a convex slope, and the product to be tested covers the irradiation surface formed by the convex slope. The light emitted from the opening under a specific angle illumination is emitted toward the surface of the product to be tested, and then reflected by the irradiation surface of the product surface, and then measured by the optical measuring instrument through the measuring port of the optical measuring instrument to obtain the corresponding reflectivity.

3. The ambient light simulation device with adjustable color temperature and illumination as claimed in claim 2, characterized in that: A standard measurement angle is formed between the axis of the receiving light beam formed by the measuring port of the optical measuring instrument and the irradiated surface and the normal line of the irradiated surface.

4. The ambient light simulation device with adjustable color temperature and illumination as claimed in claim 1, characterized in that: The measuring port of the optical measuring instrument is used for assembling the optical measuring instrument and for capturing reflected light, and is covered with a plug when not in use.

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