KR101151219B1 - Opical apparatus and colorimter calibration method - Google Patents

Opical apparatus and colorimter calibration method Download PDF

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KR101151219B1
KR101151219B1 KR1020100075181A KR20100075181A KR101151219B1 KR 101151219 B1 KR101151219 B1 KR 101151219B1 KR 1020100075181 A KR1020100075181 A KR 1020100075181A KR 20100075181 A KR20100075181 A KR 20100075181A KR 101151219 B1 KR101151219 B1 KR 101151219B1
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South Korea
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integrating sphere
disposed
flat panel
panel display
central axis
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KR1020100075181A
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Korean (ko)
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KR20120013039A (en
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김승관
박성종
황지수
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한국표준과학연구원
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Abstract

The present invention provides an optical device and a colorimeter correction method. The optical device includes an integrating sphere having an input opening and an output opening located on the central axis and having an inner surface that diffuses and reflects, a first diffuser plate disposed on a surface perpendicular to the integrating sphere central axis and disposed in the central region of the integrating sphere. A second diffuser plate disposed between the first diffuser plate and the input opening, and a flat panel display element disposed around the input opening. The luminance uniformity of the light output through the output opening is 0.5 percent or less.

Description

Optical device and colorimeter calibration method {OPICAL APPARATUS AND COLORIMTER CALIBRATION METHOD}

The present invention relates to an optical device, and more particularly, to an optical device that provides a spatially uniform brightness distribution and light source color.

The International Standardization Document defines the limits of the colorimeter's uncertainty for measuring the luminance and chromaticity coordinates of display devices.

IEC 61966-3 (2000-03), Multimedia systems and equipment-Color measurement and management-Part 3: Equipment using cathode ray tubes.

IEC 61966-4 (2000-03), Multimedia systems and equipment-Color measurement and management-Part 4: Equipment using liquid crystal display panels.

IEC 61966-5 (2008-11), Multimedia systems and equipment-Color measurement and management-Part 5: Equipment using plasma display panels.

One technical problem to be solved by the present invention is to provide a light source color generator that is equipped with a light source similar to the spectrum of the light source used in the display device in the integrating sphere to satisfy the spectrum and spatial uniformity at the same time.

An optical device according to an embodiment of the present invention includes an integrating sphere including an input opening and an output opening located on a central axis and having an inner surface diffusely reflecting thereon, the integrating sphere disposed on a surface perpendicular to the central axis of the integrating sphere. A first diffuser plate disposed in a central region, a second diffuser plate disposed between the first diffuser plate and the input opening portion, and an LED light source or a flat panel display element disposed around the input opening portion. The luminance uniformity of the light output through the output opening is 0.5 percent or less.

A colorimeter correction method according to an embodiment of the present invention comprises the steps of uniformly providing the light of the flat panel display element disposed in or around the integrating sphere to the output opening of the integrating sphere, and the uniform light emitted to the output opening of the integrating sphere And calibrating the colorimeter.

An optical device according to an embodiment of the present invention may implement a light source color light emitting device that simultaneously satisfies a spectrum and a spatial uniformity by mounting a light source similar to a spectrum of a light source used for a display in an integrating sphere.

FIG. 1A is a diagram illustrating an optical device according to an embodiment of the present invention, and FIG. 1B is a perspective view illustrating the flat panel display device of FIG. 1A.
FIG. 2A is a diagram illustrating an optical device according to another embodiment of the present invention, and FIG. 2B is a perspective view illustrating the RGB three primary LED light sources of FIG. 2A.
3 is a diagram illustrating a luminance distribution measured at an output opening using the optical device of FIG. 2A.
4A is a view illustrating an optical device according to another embodiment of the present invention, and FIG. 4B is a perspective view illustrating the flat panel display device of FIG. 4A.
5A and 5B are diagrams illustrating a colorimeter correction method using an optical device according to an embodiment of the present invention. 5A is a side cross-sectional view and FIG. 5B is a plan view.
6 is a view for explaining an optical device according to another embodiment of the present invention.

If the colorimeter is calibrated based on the standard illuminant A defined by the International Illumination Commission (CIE), the uncertainty of the luminance can be less than 1.6 percent and the uncertainty of the color coordinates can be 0.002 or less. However, the color coordinate of the luminance of the CIE standard light source A is determined using a spectroradiometer retroactive to the national standard.

However, if the color coordinates of a cold cathode fluorescent lamps (CCFL) or LED-based LCD display device are measured using a colorimeter calibrated based on standard light source A, the spectrum of the LCD display is different from that of standard light source A. It is completely different, and the difference in the color coordinates according to different colorimeters is usually more than 0.01, which exceeds the above uncertainty, so that the international standard cannot be satisfied and it causes a lot of difficulties in quality control of display products.

This problem, which is caused by the spectral difference of the light source, can be solved by using the LCD display device itself as a reference light source for colorimeter calibration instead of the CIE standard light source A.

LCD displays, on the other hand, have spatial nonuniformity of brightness and color coordinates. When using the colorimeter to measure the luminosity help the color coordinates of the LCD display device, or the measurement area of the surface which is located or measured for measuring (measurement area) different opening angle (angular aperture) that are different, the difference in the measured value by this spatial nonuniformity Causes Accordingly, a light source having a spectrum similar to that of the display device and a spatially uniform color is required for colorimetric calibration that can satisfy international standards.

The present invention provides a measuring device having a uniform spatial distribution and using a light source similar to the spectrum of a light source used in an LCD display device or the display device itself as a reference light source combined with an integrating sphere.

The standard light source A has a spectral power density that gradually increases with increasing wavelength. The colorimeter can be calibrated with the standard light source A, in which case the CIE (x, y) uncertainty U of the colorimeter can satisfy 0.002 or less at a level of inclusion factor 2, about 95 percent confidence.

However, when the color coordinate system of the flat panel display is measured using the calibrated colorimeters, the deviation (Δx, Δy) of the color coordinates according to different colorimeters becomes 0.01 or more. The deviation of the color coordinates (Δx, Δy) according to different colorimeters is the spatial nonuniformity of flat panel display, the spectral responsivity of the photodetector used in the colorimeter, and the filter bandwith of the colorimeter. , And stray light. Specifically, the spatial nonuniformity of flat panel display is based on the color coordinates depending on the acceptance area of the colorimeter, the measurement field of the colorimeter, and the distance between the flat panel display and the colorimeter. It makes a difference.

Therefore, the optical device according to the embodiment of the present invention uses an integrating sphere to secure space uniformity, and uses a light source used for a flat panel display as a reference light source in consideration of spectral distribution.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the technical idea of the present invention. . Identical components will be referred to using the same reference numerals. Similar components will be referred to using similar reference numerals.

FIG. 1A is a diagram illustrating an optical device according to an embodiment of the present invention, and FIG. 1B is a perspective view illustrating the flat panel display device of FIG. 1A.

1A and 1B, the optical apparatus includes an integrating sphere 110 including an input opening 154 and an output opening 152 positioned on a central axis 111 and having an inner surface that diffuses and reflects. The first diffuser plate 120, the first diffuser plate 120, and the input disposed on a surface perpendicular to the central axis 111 of the integrating sphere 110 and disposed in the central region of the integrating sphere 110. A second diffuser plate 132 disposed between the openings 154, and a flat panel display element 142 disposed around the input openings 154. The luminance uniformity of the light output to the output opening 152 is less than 0.5 percent.

The inner diameter of the integrating sphere 110 may be 300 mm, and the diameter of the output opening 152 may be 50 mm. The output opening 152 may form a spatial uinform light source plane. The size of the integrating sphere 110 is not limited. The luminance space uniformity in the output opening 152 is preferably within 0.5 percent. Therefore, the diameter of the output opening 152 is preferably 1/5 or less of the diameter of the integrating sphere 110.

The first diffuser plate 120 changes the uniform illuminance illuminated on the surface facing the output opening 152 of the first diffuser plate 120 by the integrating sphere 110 to a uniform luminance. The first diffusion plate 120 may be disposed at the center of the integrating sphere 110. Both surfaces of the first diffuser plate 120 may be coated to diffusely reflect. The first diffusion plate 120 may be fixed to the ceiling of the integrating sphere through the first diffusion plate fixing part 121. The first diffusion plate may be coated with BaSO 4 . The reflectance of the first diffusion plate 120 may be 90 percent or more. When the integrating sphere 110 has an inner diameter of 300 mm, the first diffusion plate 120 may be a disc having a diameter of 120 mm. In consideration of the brightness of the flat panel display element 142, the diameter of the first diffusion plate 120 may be preferably 1/2 or less of the inner diameter of the integrating sphere 110. On the other hand, the diameter of the first diffuser plate 120 is the first diffuser plate 120 when looking at the output opening 152 vertically from the outside at least 40 cm (cm) from the output opening 152 during colorimeter calibration ) Edges should be large so that they are not visible.

The second diffusion plate 132 may have the same structure as the first diffusion plate 120. The second diffuser plate 132 is disposed between the first diffuser plate 120 and the flat panel display element 142. The second diffusion plate 132 may be disposed at an intermediate position between the first diffusion plate 120 and the flat panel display element 142. One end of the support bar 134 may be fixedly coupled to an edge of the second diffusion plate 132 and may extend in the central axis direction 111 of the input opening 154. The support rod 134 may be a plurality. The plurality of support bars 134 may be disposed in parallel to each other. The other end of the support bar 134 may be combined with the washer-shaped fixing part 136. The fixing part 136 may be inserted into the input opening of the integrating sphere 110. The fixing part 136 may be fixedly coupled to the integrating sphere 110.

The second diffuser plate 132 blocks the radiation flux so that the radiation flux output from the flat panel display element 142 does not directly shine on the first hemisphere surface including the output opening 152. do. Accordingly, the first hemispherical surface may have a uniform luminance distribution, and a uniform illuminance distribution may be formed at the center of the integrating sphere.

The diameter of the second diffuser plate 132 is increased so that the boundary between bright light and shadow generated by the flat panel display element 142 and the second diffuser plate 132 does not exceed the first hemisphere. For example, in the case of the integrating sphere 110 having a diameter of 300 mm, the diameter of the second diffusion plate 132 may be 170 mm.

The adapter 145 may be in the form of a washer and have a jaw that increases in thickness as the radius decreases. The jaw of the adapter 145 may be inserted into and fixed to the fixing part 136. The inner radius of the adapter 145 increases along the direction of the central axis to form an inclined surface. Accordingly, when the flat panel display element 142 is mounted to the adapter, the inclined surface is scattered from the input opening 154 or the fixing unit 136 by the light emitted from the flat panel display element 142, and again the flat panel display. The return to the element 142 can be prevented. The inclined surface is coated with BaSO 4 .

The flat panel display element 142 may include at least one of an LCD, an LED, and an organic EL element. The flat panel display element 142 may output red, green, and blue colors. The flat panel display element 142 may be disposed outside the input opening 154. The passivation layer 144 may be disposed between the flat panel display element 142 and the integrating sphere 120 to prevent damage to the flat panel display element 120. The passivation layer 144 may include a soft cloth.

According to a modified embodiment of the present invention, the flat panel display element 142 may be disposed inside the integrating sphere 110. Specifically, the optical device includes an integrating sphere 110 having an inner surface that diffuses and reflects the pole 101 and the output opening 152 disposed at positions where the integrating sphere central axis 111 and the inner surface cross each other. A first diffuser plate 120 disposed on a surface perpendicular to the integrating sphere central axis 111 and disposed in a central region of the integrating sphere 110 and the pole 101 on the integrating sphere central axis 111; And the flat panel display element 142 disposed between the first diffuser plate 120 and the flat panel display element 142 and the first diffuser plate 120 at the integrating sphere central axis 111. The second diffusion plate 132 is included. Light directly radiated from the upper display element 142 is irradiated inside a tangent line where the plane on which the first diffusion plate 120 is disposed and the inner surface of the integrating sphere intersect, and the light is output to the output opening 152. The luminance uniformity is 0.5 percent or less.

FIG. 2A is a diagram illustrating an optical device according to another embodiment of the present invention, and FIG. 2B is a perspective view illustrating the light source element of FIG. 2A.

2A and 2B, the optical apparatus includes an integrating sphere 110 including an input opening 154 and an output opening 152 positioned on the central axis 111 and having an inner surface that diffuses and reflects. The first diffuser plate 120, the first diffuser plate 120, and the input disposed on a surface perpendicular to the central axis 111 of the integrating sphere 110 and disposed in the central region of the integrating sphere 110. A second diffuser plate 132 disposed between the openings 154, and a light source element 242 disposed around the input opening 154. The luminance uniformity of the light output to the output opening 152 is less than 0.5 percent.

The light source element 242 may be red, green, and blue LED elements 242r, 242g, and 242b. The light source element 242 may be mounted on the support plate 244. The support plate 244 may be fixedly coupled to the support port 246. The support port 246 may include a through hole 247 at the center. The wiring of the light source element 242 may extend through the through hole 247. The support port 246 may be fixedly coupled to the fixing part 136 mounted to the input opening 154.

One end of the support bar 134 may be fixedly coupled to the second diffusion plate 132 and extend in the central axis direction 111 of the input opening 154. The support rod 134 may be a plurality. The plurality of support bars 134 may be disposed in parallel to each other. The other end of the support bar 134 may be combined with the washer-shaped fixing part 136. The fixing part 136 may be inserted into the input opening and fixedly coupled to the integrating sphere 110.

3 is a diagram illustrating luminance distribution measured at an output opening using the optical device of FIG. 2A.

2A and 3, according to the computer simulation, assuming that the luminance of the inner surface of the integrating sphere 110 is uniform, the uniformity of the luminance in the output opening 152 is about 0.15 percent. According to the computer simulation, the luminance distribution has a lower luminance at the center and a higher luminance toward the edge.

On the other hand, according to the actual measurement results, the luminance distribution in the output opening 152 is higher in the center and lower toward the edge. This is interpreted that the reflectance distribution of the first diffusion plate 120 affects the luminance distribution of the output opening 152. For example, when the reflectance distribution of the first diffuser plate 120 is higher in the center and lowered toward the edge, the luminance distribution of the output opening 152 has a higher luminance in the center and lower luminance toward the edge. .

     According to the actual measurement results, by controlling the diameter of the output opening 152 and the reflectance distribution of the first diffusion plate 120, the luminance distribution of the output opening 152 was able to obtain a luminance uniformity of 0.5 percent or less. In addition, when there is no spectral change of the light source, the color coordinate uniformity of the spatial uniform light source is smaller than the luminance uniformity. On the other hand, the spectral change of the light source may vary according to the change of the ambient temperature in the case of the LED light source. In this case, since the junction voltage is accompanied by a change, the change in the junction voltage can be monitored to accurately predict the change in the color coordinate.

In addition, in the case of an LED light source, changes in luminance and color coordinates according to usage time may be predicted through an aging function. In order to calculate the aging function based on luminance and color coordinates, the functional relationship between junction voltage, radiative luminance and color coordinates is first obtained by using LEDs. Then, with the LEDs on, periodically measure the junction voltage, radiance and color coordinates for more than 1000 hours. The aging function is obtained by separating the functional relationship between the junction voltage, radiance and color coordinates from the measurement data.

4A is a view illustrating an optical device according to another embodiment of the present invention, and FIG. 4B is a perspective view illustrating the flat panel display device of FIG. 4A.

4A and 4B, the optical device includes an pole 101 and an output opening 152 disposed at a position where the central axis 111 and the inner surface intersect each other and have an inner surface that diffuses and reflects. In the sphere 110, the first diffuser plate 120 disposed on a surface perpendicular to the integrating sphere central axis 111 and in the central region of the integrating sphere 110, and the integrating sphere central axis 111. And a flat panel display element 340 disposed between the pole 101 and the first diffusion plate 120 and disposed to irradiate the pole 101. The luminance uniformity of the light output to the output opening 152 is less than 0.5 percent.

The second diffuser plate 132 may be disposed on the rear surface of the flat panel display element 340. The second diffuser plate 132 may diffusely reflect the light reflected from the integrating sphere 110.

5A and 5B are views for explaining a colorimeter correction method using an optical device according to an embodiment of the present invention. 5A is a side cross-sectional view and FIG. 5B is a plan view.

Referring to FIGS. 5A and 5B, the colorimeter correction method uniformly distributes light of the flat panel display element 142 disposed in or around the integrating sphere 110 through the output opening 152 of the integrating sphere 110. Providing, calibrating the colorimeter 182 using the uniform light emitted into the output opening 152 of the integrating sphere 110, and using the calibrated colorimeter 182 of the new flat panel display. Measuring the optical properties.

Uniformly providing light to the output opening 152 of the integrating sphere 110 may be provided using the optical apparatus described with reference to FIGS. 1A, 2A, and 4A.

The integrating sphere 110 may be mounted to the base plate 172. The source meter 149 may measure at least one of voltage, current, and power provided to the flat panel display device 142.

The colorimeter 182 may be spaced apart from the output opening 152. The colorimeter 182 may include a lens system. The colorimeter 182 may be installed on the two-axis moving table 187. The two-axis moving table 187 may include a z-axis moving table 188 and the x, y axis moving table (186). Accordingly, the colorimeter 182 may measure the light emitted from the output opening 152 while moving the position of the x-y plane at a specific position of z. The light emitted to the output opening 152 may include red, green, and blue. Accordingly, according to each color, the colorimeter 182 may be calibrated.

Using the calibrated colorimeter, the optical properties of the new flat panel display can be measured. The new flat panel display may be of the same type as the flat panel display device.

6 is a view for explaining an optical device according to another embodiment of the present invention.

Referring to FIG. 6, the optical device includes an integrating sphere 110 including an pole 101 and an output opening 152 disposed at a position where a central axis 111 and an inner surface intersect each other, and having an inner surface that diffuses and reflects. ), An LED light source or a flat panel display device disposed between the pole 101 and the center region of the integrating sphere 110 in the central axis 111 of the integrating sphere 110 and disposed to irradiate the pole 101. 440 and a diffusion disposed on a surface perpendicular to the central axis 111 of the integrating sphere 110 and disposed between the central region of the integrating sphere 110 and the LED light source or the flat panel display element 440. Plate 432. The luminance uniformity of the light output through the output opening 152 is 0.5 percent or less.

The LED light source or flat panel display element 440 and the diffusion plate 432 are disposed to contact each other. The diffusion plate 432 may be disposed on the rear surface of the flat panel display element 440. The diffusion plate 432 may diffusely reflect the light reflected from the integrating sphere 110.

 So far, the present invention has been described through specific examples. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

100: integrating sphere
111: central axis
152: output opening
142: flat panel display element
120: first diffusion plate
132: second diffusion plate
154: input opening

Claims (11)

An integrating sphere comprising an input opening and an output opening located on a central axis and having an inner surface that diffuses and reflects;
A first diffuser plate disposed on a surface perpendicular to the integrating sphere central axis and disposed in a central region of the integrating sphere;
A second diffuser plate disposed between the first diffuser plate and the input opening; And
An LED light source or a flat panel display element disposed around the input opening;
And the luminance uniformity of the light output through the output opening is 0.5 percent or less. The method according to claim 1,
And said flat panel display element comprises red, green and blue LED elements. The method according to claim 1,
And said flat panel display element is an LCD element. The method according to claim 1,
And the reflectivity of the first diffuser plate is high at the center and low at the edge. An integrating sphere having poles and an output opening arranged at positions where the central axis and the inner surface cross each other and having an inner surface that diffuses and reflects;
A first diffuser plate disposed on a surface perpendicular to the integrating sphere central axis and disposed in a central region of the integrating sphere; And
An LED light source or a flat panel display element disposed between the pole and the first diffusion plate in the integrating sphere central axis and arranged to irradiate the pole;
And the luminance uniformity of the light output through the output opening is 0.5 percent or less. The method of claim 5,
An optical device, characterized in that the second diffusion plate is disposed on the rear surface of the flat panel display element. An integrating sphere including an pole and an output opening disposed at a position where the integrating sphere central axis and the inner surface cross each other, and having an inner surface diffusing and reflecting;
A first diffuser plate disposed on a surface perpendicular to the integrating sphere central axis and disposed in a central region of the integrating sphere;
A light source disposed between the pole and the first diffusion plate in the integrating sphere central axis; And
A second diffuser plate disposed between the light source and the first diffuser plate at the integrating sphere central axis,
Light directly radiated from the light source is irradiated inside a tangent line where the plane on which the first diffusion plate is disposed and the inner surface of the integrating sphere intersect,
And the luminance uniformity of the light output through the output opening is 0.5 percent or less. An integrating sphere having poles and an output opening arranged at positions where the central axis and the inner surface cross each other and having an inner surface that diffuses and reflects;
An LED light source or a flat panel display element disposed between the pole and the central region of the integrating sphere in the integrating sphere central axis and arranged to irradiate the pole; And
A diffusion plate disposed on a surface perpendicular to the integrating sphere central axis and disposed between the central region of the integrating sphere and the LED light source or the flat panel display element,
And the luminance uniformity of the light output through the output opening is 0.5 percent or less. The method of claim 8,
And the LED light source or the flat panel display element and the diffusion plate are arranged to contact each other. Uniformly providing light of an LED light source or a flat panel display element disposed in or around the integrating sphere to an output opening of the integrating sphere; And
Calibrating the colorimeter using spatially uniform light emitted into the output opening of the integrating sphere,
The luminance uniformity of the light output through the output opening is less than 1 percent. 11. The method of claim 10,
And measuring the optical characteristics of the new flat panel display device using the calibrated colorimeter.
KR1020100075181A 2010-08-04 2010-08-04 Opical apparatus and colorimter calibration method KR101151219B1 (en)

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GB2507775A (en) 2012-11-09 2014-05-14 Feasa Entpr Ltd Scattering and analyzing LED light with sphere having central baffle
CN109405964A (en) * 2018-11-05 2019-03-01 昆山钧沃光电有限公司 A kind of high brightness high uniformity adjustable color light source
CN109738159A (en) * 2019-03-14 2019-05-10 贵州大学 A kind of focusing mirror integrating sphere uniform source

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Publication number Priority date Publication date Assignee Title
JPH0776710A (en) * 1993-07-13 1995-03-20 E I Du Pont De Nemours & Co Production of fine densely packed spherical silver particle
JP2002062189A (en) 2000-08-24 2002-02-28 Shimadzu Corp Detector for spectrophotometry and integrating sphere- measuring instrument using it, and spectrophotometer
JP2002318156A (en) 2001-04-24 2002-10-31 Matsushita Electric Ind Co Ltd Light quantity measuring device
KR20070111671A (en) * 2006-05-18 2007-11-22 심현섭 Color measuring apparatus using reflected light and control method there of

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0776710A (en) * 1993-07-13 1995-03-20 E I Du Pont De Nemours & Co Production of fine densely packed spherical silver particle
JP2002062189A (en) 2000-08-24 2002-02-28 Shimadzu Corp Detector for spectrophotometry and integrating sphere- measuring instrument using it, and spectrophotometer
JP2002318156A (en) 2001-04-24 2002-10-31 Matsushita Electric Ind Co Ltd Light quantity measuring device
KR20070111671A (en) * 2006-05-18 2007-11-22 심현섭 Color measuring apparatus using reflected light and control method there of

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