KR20090053500A - Actinograph and back light unit therewith - Google Patents
Actinograph and back light unit therewith Download PDFInfo
- Publication number
- KR20090053500A KR20090053500A KR1020070120365A KR20070120365A KR20090053500A KR 20090053500 A KR20090053500 A KR 20090053500A KR 1020070120365 A KR1020070120365 A KR 1020070120365A KR 20070120365 A KR20070120365 A KR 20070120365A KR 20090053500 A KR20090053500 A KR 20090053500A
- Authority
- KR
- South Korea
- Prior art keywords
- light
- integrating sphere
- measuring device
- emitting diode
- integrating
- Prior art date
Links
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 25
- 230000003287 optical effect Effects 0.000 claims description 19
- 239000000758 substrate Substances 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/08—Arrangements of light sources specially adapted for photometry standard sources, also using luminescent or radioactive material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2607—Circuits therefor
- G01R31/2632—Circuits therefor for testing diodes
- G01R31/2635—Testing light-emitting diodes, laser diodes or photodiodes
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
Light amount measuring apparatus according to an embodiment of the present invention, the hollow spherical at least one integrating sphere; A light inflow portion penetrating into the integrating sphere; And a sensor that senses light inside the integrating sphere.
Integrating sphere, light emitting diode
Description
The present invention relates to a light quantity measuring device using an integrating sphere and a backlight unit having the same, and more particularly, a light quantity measuring device for measuring a light quantity in a light generating device using a light emitting diode and a light emission having the light quantity measuring device. It relates to a diode type backlight unit.
In general, a light emitting diode (LED) is a semiconductor device that emits light in response to an applied current. The light emitting diode has a spotlight as a next generation lighting device due to its very small size, low power consumption, and very long life compared to a light bulb.
Unlike the well-known semiconductor devices, the light emitting diodes emit light, and thus the method of measuring the characteristics of the light emitting diodes is very different from that of other semiconductor devices. In particular, the process of applying a constant current and measuring the amount of light generated is significantly different from other semiconductor devices.
1 is a configuration diagram illustrating a principle of measuring light quantity of a light emitting diode.
Referring to FIG. 1, the
Meanwhile, a
At this time, in adjusting the light intensity in the configuration in which the
That is, as shown in FIG. 1, the
In order to prevent the saturation phenomenon, a method of reducing the intensity of light in the backlight unit has been developed in various ways.
As an example, a method of controlling the amount of light by reducing the size of a hole in a path through which light passes has been proposed. This method can easily adjust the amount of light and has excellent attenuation in the entire band (even if the color is changed, the amount of light attenuation is constant). However, if the passage of the light is made small, the phenomenon that the unevenness of the light generated by the backlight unit such as the pinhole camera is transferred to the optical sensor as it is. Therefore, there is a problem that the uniformity of the product is not constant, such as difficult to detect accurately and the amount of attenuation is different depending on the attachment method.
As another method, a method has been proposed in which a semi-transmissive material is inserted into a passage through which light passes to cause attenuation of light. This method eliminates the pinhole phenomenon and obtains even characteristics, but there is a rare problem that the semi-transparent material has an even attenuation over the whole band. In addition, there is a problem that the change in characteristics is exhibited over time.
Accordingly, the technical problem of the present invention is to solve such a conventional problem, and an object of the present invention is to accurately perform light attenuation, has an even light attenuation function over the entire visible light band, and has a large amount of light measurement interval. It is to provide a measuring device.
It is another object of the present invention to provide a light quantity measuring device in which attenuation of light to be measured is constant and a backlight unit using the same.
Another object of the present invention is to provide a light quantity measuring device capable of obtaining a high light attenuation rate and a backlight unit using the same.
In order to achieve the above object of the present invention, a light quantity measuring device includes: a hollow spherical at least one integrating sphere; A light inflow portion penetrating into the integrating sphere; And a sensor for sensing light inside the integrating sphere.
Here, the light reflection coating is formed on the inner surface of the integrating sphere.
The integrating sphere is provided in plurality, and the integrating spheres are connected to each other in series by an optical path.
The light quantity measuring device further includes a light control unit for controlling the amount of light passing through the light path.
On the other hand, the light control unit further comprises a through groove.
Here, the cross-sectional area of the through groove is smaller than the cross-sectional area of the optical path.
The backlight unit according to an embodiment of the present invention comprises at least one integrating sphere of a hollow sphere; A light inflow portion penetrating into the integrating sphere; And a light sensor for sensing light inside the integrating sphere, and a light source disposed adjacent to the light quantity measuring device.
Here, the light source, the substrate; And a plurality of light emitting diode chips disposed on the substrate.
In the backlight unit, the light emitting diode chip may be a light emitting diode chip that emits red, green, and blue light.
Optionally, the light emitting diode chip may be a light emitting diode chip emitting white light.
Meanwhile, the light source measuring device may be formed inside the substrate.
In such a backlight unit, a light reflection coating is formed on the inner surface of the integrating sphere.
In the backlight unit, a plurality of integrating spheres are provided, and the integrating spheres are connected to each other in series by an optical path.
In such a backlight unit, a light control unit for controlling the amount of light passing through the light path is further provided.
In addition, the light control unit further includes a through groove.
In addition, the cross-sectional area of the through groove is smaller than the cross-sectional area of the optical path.
As described above, according to the light quantity measuring apparatus and the backlight unit according to the present invention, it is possible to effectively measure the light quantity in a wider section in the backlight, the attenuation of the light to be measured is evenly performed in all bands, By connecting the integrating spheres in series, a high light attenuation rate can be obtained.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed subject matter is thorough and complete, and that the scope of the invention to those skilled in the art will fully convey. As described in the drawing, the viewpoint of an observer is explained, and when a part of a layer, a film, an area, a plate, etc. is located on another part, this includes not only the part directly above the part but also another part in the middle. . On the contrary, when a part is directly above another part, it means that there is no other part in the middle.
2 is a block diagram of a backlight unit according to an embodiment of the present invention.
Referring to FIG. 2, the
The
The light
Optionally, although not shown in the drawing, an additional light member such as a light guide plate may replace the
As shown in FIG. 2, the light
Although the light
3 is a partially enlarged view of the light
Referring to FIG. 3, the light
The inner surface of the
In order to inject more light into the integrating sphere, the maximum incidence angle θ is preferably large. The larger the size of the hollow space in the integrating sphere, the more uniform the light quantity distribution in the integrating sphere is, and thus the diameter of the
In general, since the diameter of the
4 is a cross-sectional view taken along the line IV-IV of FIG. 3.
Referring to FIG. 4, it can be seen that the integrating
5 is a conceptual diagram showing a configuration of another embodiment of the light quantity measuring device of the present invention.
Referring to FIG. 5, a plurality of integrating
Therefore, the light flowing into the
Fig. 6 is a partial cross-sectional view showing a state in which a plurality of integrating spheres shown in Fig. 5 are arranged on a substrate. Referring to Fig. 6, a plurality of integrating spheres are arranged in series in a predetermined extending direction so that one integral In the case of insufficient light attenuation alone, the space can be used efficiently while simultaneously using a plurality of integrating spheres for efficient space use, rather than being arranged in a straight line, as shown in FIGS. It is preferable to arrange | position shiftly.
FIG. 7 is a partial perspective view illustrating a coupling relationship between an integrating sphere and an integrating sphere and an optical control unit disposed in the optical passage. In particular, FIG. 7 is a view showing a connection between the first integrating
Referring to FIG. 7, the first
The present invention can be used in the technical field regarding the backlight unit and the light quantity measuring device.
1 is a configuration diagram illustrating a light quantity measuring principle in a conventional light emitting diode type backlight unit.
2 is a configuration diagram illustrating a light quantity measuring principle of a light emitting diode type backlight unit using an integrating sphere according to an embodiment of the present invention.
3 is a partially enlarged view of the light quantity measuring device of FIG. 2.
4 is a cross-sectional view taken along line IV-IV of FIG. 3.
It is a block diagram explaining the light quantity measuring device in which the several integrating sphere was used.
6 is a partial perspective exploded view of the light quantity measuring device of FIG. 5.
7 is a partially exploded perspective view illustrating a coupling relationship between the light control unit and the light path of FIG. 6.
* Description of the main parts of the drawings *
100: backlight unit 110: substrate
120: light emitting diode chip 130: light quantity measuring device
132: light inlet 134: sensor
136: integrating sphere 140: light member
150: light mixing space 200: first integrating sphere
250: First light path 252: First light control unit
300: second integrating sphere 350: second light path
352: second light control unit 400: third integrating sphere
434: sensor
Claims (16)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020070120365A KR20090053500A (en) | 2007-11-23 | 2007-11-23 | Actinograph and back light unit therewith |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020070120365A KR20090053500A (en) | 2007-11-23 | 2007-11-23 | Actinograph and back light unit therewith |
Publications (1)
Publication Number | Publication Date |
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KR20090053500A true KR20090053500A (en) | 2009-05-27 |
Family
ID=40860995
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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KR1020070120365A KR20090053500A (en) | 2007-11-23 | 2007-11-23 | Actinograph and back light unit therewith |
Country Status (1)
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KR (1) | KR20090053500A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10551312B2 (en) | 2017-12-29 | 2020-02-04 | Samsung Electronics Co., Ltd. | Optical sensor, and apparatus and method for measuring absorbance using the same |
CN116295820A (en) * | 2023-05-19 | 2023-06-23 | 中国科学院长春光学精密机械与物理研究所 | Cascade integrating sphere light source |
-
2007
- 2007-11-23 KR KR1020070120365A patent/KR20090053500A/en active IP Right Grant
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10551312B2 (en) | 2017-12-29 | 2020-02-04 | Samsung Electronics Co., Ltd. | Optical sensor, and apparatus and method for measuring absorbance using the same |
CN116295820A (en) * | 2023-05-19 | 2023-06-23 | 中国科学院长春光学精密机械与物理研究所 | Cascade integrating sphere light source |
CN116295820B (en) * | 2023-05-19 | 2023-08-08 | 中国科学院长春光学精密机械与物理研究所 | Cascade integrating sphere light source |
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