CN111222523A - LED classification device and method - Google Patents

LED classification device and method Download PDF

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Publication number
CN111222523A
CN111222523A CN201811416304.0A CN201811416304A CN111222523A CN 111222523 A CN111222523 A CN 111222523A CN 201811416304 A CN201811416304 A CN 201811416304A CN 111222523 A CN111222523 A CN 111222523A
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chromaticity
light
led
leds
corrected
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谭启明
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Guizhou Jinghong Photoelectric Co ltd
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Guizhou Jinghong Photoelectric Co ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition
    • G06F18/20—Analysing
    • G06F18/24—Classification techniques
    • 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
    • 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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • 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
    • G02F1/133613—Direct backlight characterized by the sequence of light sources
    • 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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
    • 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
    • G02F1/133624—Illuminating devices characterised by their spectral emissions

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Data Mining & Analysis (AREA)
  • Optics & Photonics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
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  • Bioinformatics & Cheminformatics (AREA)
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  • Bioinformatics & Computational Biology (AREA)
  • Artificial Intelligence (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Led Device Packages (AREA)

Abstract

In the LED classification device (21), when the chromaticity of 1 st light of an LED which combines an LED element emitting 1 st light and a fluorescent material which is excited by the 1 st light and emits 2 nd light having a longer wavelength than the 1 st light is within a predetermined range, the LED is classified as an object used for a backlight of a liquid crystal display device. A coefficient calculation unit (26) and a corrected chromaticity calculation unit (27) calculate, for all LEDs to be classified, correction values of chromaticities obtained by assuming that 1 time light passes through a color filter of a liquid crystal display device, and correct the chromaticities by subtracting the correction values from the chromaticities obtained for all the LEDs to be classified, respectively. A chromaticity rank classification unit (28) classifies the chromaticity ranks of the LEDs based on the corrected chromaticity.

Description

LED classification device and method
Technical Field
The present invention relates to an LED classification method for classifying whether or not a plurality of LEDs (light emitting diodes) can be used for a backlight of a liquid crystal display device based on the chromaticity distribution thereof
Background
In recent years, as a backlight of a liquid crystal display device, a backlight using an LED having a long life and low power consumption as a light source has been widely used. White LEDs are typically used for such backlights. The white LED is generally configured by combining a blue LED and a phosphor. In such a white LED, white light is obtained by color mixing blue light emitted from the blue LED chip and light emitted from the phosphor excited by the blue light. For example, in a white LED using a green phosphor and a red phosphor as phosphors, when the green phosphor and the red phosphor are excited by blue light to obtain green light and red light, and the green light and the red light are color-mixed with the blue light to obtain white light, and when such a white LED is used as a backlight, it is necessary to apply the phosphors so as to emit desired white light in accordance with the display characteristics of a liquid crystal panel of a liquid crystal display device
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a method for classifying LEDs, which can cause the deviation of the balance of light intensity between the excitation light of a fluorescent body and the blue light of a blue LED, so that the chromaticity among white LEDs is also deviated.
The technical scheme is as follows: an LED classification method for classifying an LED as an object to be used for a backlight of a liquid crystal display device, when chromaticity of 1 st light of the LED, which emits a combined light of the 1 st light and 2 nd light, is within a predetermined range by combining an LED element that emits the 1 st light and a phosphor that is excited by the 1 st light and emits the 2 nd light having a longer wavelength than the 1 st light, the LED classification method comprising: a chromaticity correction step of calculating a correction value of the chromaticity generated by the 1-time light transmission through a color filter of the liquid crystal display device for all the LEDs to be classified, and correcting the chromaticity as a corrected chromaticity for all the LEDs to be classified based on the correction value; and a chromaticity rank classification step of classifying the chromaticity ranks of the LEDs based on the corrected chromaticity.
Specifically, the chromaticity correction process includes: a coefficient calculation step of calculating an average wavelength of peak wavelengths of the 1 st light obtained for all the LEDs to be classified, calculating a variation between a reference chromaticity and the chromaticity with respect to the reference chromaticity when the 1 st light having the average wavelength transmits through the color filter, and calculating a slope of an offset amount of the variation with respect to the peak wavelength from the average wavelength as a coefficient of a correction value of the chromaticity; and a corrected chromaticity calculation step of calculating the corrected chromaticity by multiplying the difference between the peak wavelength and the average wavelength by the coefficient and subtracting the corrected chromaticity from the chromaticity obtained for all the LEDs to be classified.
Specifically, the 1 st light is blue light.
Specifically, the chromaticity correction step corrects the chromaticity using an isochromatic function of a 10-degree field of view.
Specifically, an LED classification device for classifying an LED as an object to be used for a backlight of a liquid crystal display device, when chromaticity of 1 st light of the LED which emits a combined light of the 1 st light and 2 nd light is within a predetermined range by combining an LED element which emits the 1 st light and a phosphor which is excited by the 1 st light and emits the 2 nd light having a longer wavelength than the 1 st light, the LED classification device comprising: a chromaticity correction unit that calculates a correction value of the chromaticity, which is generated by the 1-time light transmission through a color filter of the liquid crystal display device, for all the LEDs to be classified, and corrects the chromaticity as a corrected chromaticity for all the LEDs to be classified based on the correction value; and a chromaticity rank classification unit that classifies chromaticity ranks of the LEDs based on the corrected chromaticity.
Specifically, the chromaticity correction unit includes: a coefficient calculation unit that calculates an average wavelength of peak wavelengths of the 1 st light obtained for all the LEDs to be classified, calculates a variation between a reference chromaticity and the chromaticity with respect to the reference chromaticity when the 1 st light having the average wavelength transmits through the color filter, and calculates a slope of an offset amount of the variation with respect to the peak wavelength from the average wavelength as a coefficient of a correction value of the chromaticity; and a corrected chromaticity calculation unit that calculates the corrected chromaticity by multiplying a difference between the peak wavelength and the average wavelength by the coefficient, and subtracting the corrected value from the chromaticity obtained for all the LEDs as the classification target.
Specifically, the 1 st light is blue light.
Specifically, the chromaticity correction unit corrects the chromaticity using an isochromatic function of a 10-degree field of view.
Specifically, a computer is caused to function as each unit of the LED sorting device according to any one of claims 5 to 8.
Specifically, the LED classification program of claim 9 is recorded
Has the advantages that: the invention has the advantages that: the LED classification method according to the present invention, configured as described above, has the following effects: the LED display screen is easy to sort, even if the LED display screen is installed on the backlight source, the brightness of the LED display screen does not need to be reduced, the serial number is preset for each LED display unit, each LED display unit can be identified, the corresponding LED display unit can be identified through the serial number, the LED display screen can be adapted to the LED display screen which is connected randomly, the control is convenient, and the LED display screen has good market application prospect.
Drawings
Fig. 1 is a perspective view showing a configuration of a liquid crystal display device in which LEDs classified by the LED classification method according to an embodiment of the present invention are used for a backlight.
Fig. 2 is a perspective view showing another configuration of a liquid crystal display device in which LEDs classified by the LED classification method according to the embodiment of the present invention are used for a backlight.
Detailed Description
The invention is further elucidated with reference to the drawings and the detailed description.
Example 1
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the present embodiment, there is provided an LED classification method for classifying an LED as an object to be used for a backlight of a liquid crystal display device, when chromaticity of 1 st light of the LED which emits combined light of the 1 st light and 2 nd light is within a predetermined range by combining an LED element which emits the 1 st light and a phosphor which is excited by the 1 st light and emits the 2 nd light having a longer wavelength than the 1 st light, the LED classification method including: a chromaticity correction step of calculating a correction value of the chromaticity generated by the 1-time light transmission through a color filter of the liquid crystal display device for all the LEDs to be classified, and correcting the chromaticity as a corrected chromaticity for all the LEDs to be classified based on the correction value; and a chromaticity rank classification step of classifying the chromaticity ranks of the LEDs based on the corrected chromaticity.
Specifically, the chromaticity correction process includes: a coefficient calculation step of calculating an average wavelength of peak wavelengths of the 1 st light obtained for all the LEDs to be classified, calculating a variation between a reference chromaticity and the chromaticity with respect to the reference chromaticity when the 1 st light having the average wavelength transmits through the color filter, and calculating a slope of an offset amount of the variation with respect to the peak wavelength from the average wavelength as a coefficient of a correction value of the chromaticity; and a corrected chromaticity calculation step of calculating the corrected chromaticity by multiplying the difference between the peak wavelength and the average wavelength by the coefficient and subtracting the corrected chromaticity from the chromaticity obtained for all the LEDs to be classified.
Specifically, the 1 st light is blue light.
Specifically, the chromaticity correction step corrects the chromaticity using an isochromatic function of a 10-degree field of view.
Specifically, an LED classification device for classifying an LED as an object to be used for a backlight of a liquid crystal display device, when chromaticity of 1 st light of the LED which emits a combined light of the 1 st light and 2 nd light is within a predetermined range by combining an LED element which emits the 1 st light and a phosphor which is excited by the 1 st light and emits the 2 nd light having a longer wavelength than the 1 st light, the LED classification device comprising: a chromaticity correction unit that calculates a correction value of the chromaticity, which is generated by the 1-time light transmission through a color filter of the liquid crystal display device, for all the LEDs to be classified, and corrects the chromaticity as a corrected chromaticity for all the LEDs to be classified based on the correction value; and a chromaticity rank classification unit that classifies chromaticity ranks of the LEDs based on the corrected chromaticity.
Specifically, the chromaticity correction unit includes: a coefficient calculation unit that calculates an average wavelength of peak wavelengths of the 1 st light obtained for all the LEDs to be classified, calculates a variation between a reference chromaticity and the chromaticity with respect to the reference chromaticity when the 1 st light having the average wavelength transmits through the color filter, and calculates a slope of an offset amount of the variation with respect to the peak wavelength from the average wavelength as a coefficient of a correction value of the chromaticity; and a corrected chromaticity calculation unit that calculates the corrected chromaticity by multiplying a difference between the peak wavelength and the average wavelength by the coefficient, and subtracting the corrected value from the chromaticity obtained for all the LEDs as the classification target.
Specifically, the 1 st light is blue light.
Specifically, the chromaticity correction unit corrects the chromaticity using an isochromatic function of a 10-degree field of view.
Specifically, a computer is caused to function as each unit of the LED sorting device according to any one of claims 5 to 8.
Specifically, the LED classification program of claim 9 is recorded.

Claims (10)

1. An LED classification method for classifying an LED that emits a combined light of 1 st light and 2 nd light when chromaticity of the 1 st light of the LED, which is excited by the 1 st light and emits the 2 nd light having a longer wavelength than the 1 st light, is within a predetermined range, the LED classification method comprising: a chromaticity correction step of calculating a correction value of the chromaticity generated by the 1-time light transmission through a color filter of the liquid crystal display device for all the LEDs to be classified, and correcting the chromaticity as a corrected chromaticity for all the LEDs to be classified based on the correction value; and a chromaticity rank classification step of classifying the chromaticity ranks of the LEDs based on the corrected chromaticity.
2. The LED classification method according to claim 1, wherein the chromaticity correction process includes: a coefficient calculation step of calculating an average wavelength of peak wavelengths of the 1 st light obtained for all the leds to be classified, calculating a variation between a reference chromaticity and the chromaticity with respect to the reference chromaticity when the 1 st light having the average wavelength transmits the color filter, and calculating a slope of a shift amount of the variation from the average wavelength with respect to the peak wavelength as a coefficient of a correction value of the chromaticity; and a corrected chromaticity calculation step of calculating the corrected chromaticity by multiplying the difference between the peak wavelength and the average wavelength by the coefficient and subtracting the corrected chromaticity from the chromaticity obtained for all the LEDs to be classified.
3. The LED classification method according to claim 1 or 2, characterized in that the 1 st light is blue light.
4. The LED classification method according to claim 1, 2 or 3, wherein the chromaticity correction process corrects the chromaticity using an isochromatic function of a 10-degree field of view.
5. An LED classification device that classifies an LED element that emits 1 st light and a phosphor that is excited by the 1 st light and emits 2 nd light having a longer wavelength than the 1 st light, as objects to be used for a backlight of a liquid crystal display device, the LED classification device being characterized by comprising, when chromaticity of the 1 st light of an LED that emits a combined light of the 1 st light and the 2 nd light is within a predetermined range, an LED element that emits the 1 st light and the phosphor that is excited by the 1 st light and emits the 2 nd light having a longer wavelength than the 1 st light: a chromaticity correction unit that calculates a correction value of the chromaticity, which is generated by the 1-time light transmission through a color filter of the liquid crystal display device, for all the LEDs to be classified, and corrects the chromaticity as a corrected chromaticity for all the LEDs to be classified based on the correction value; and a chromaticity rank classification unit that classifies chromaticity ranks of the LEDs based on the corrected chromaticity.
6. The LED classification apparatus of claim 5, wherein the chromaticity correction unit comprises: a coefficient calculation unit that calculates an average wavelength of peak wavelengths of the 1 st light obtained for all the leds to be classified, calculates a variation between a reference chromaticity and the chromaticity with respect to the reference chromaticity when the 1 st light having the average wavelength transmits through the color filter, and calculates a slope of a shift amount of the variation from the average wavelength with respect to the peak wavelength as a coefficient of a correction value of the chromaticity; and a corrected chromaticity calculation unit that calculates the corrected chromaticity by multiplying a difference between the peak wavelength and the average wavelength by the coefficient, and subtracting the corrected value from the chromaticity obtained for all the LEDs as the classification target.
7. The LED sorting apparatus according to claim 5 or 6, wherein the 1 st light is blue light.
8. The LED classification apparatus according to claim 5, 6 or 7, wherein the chromaticity correction unit corrects the chromaticity using an isochromatic function of a 10-degree field of view.
9. An LED classification program for causing a computer to function as each unit of the LED classification device according to any one of claims 5 to 8.
10. A computer-readable recording medium characterized in that the led classification program according to claim 9 is recorded.
CN201811416304.0A 2018-11-26 2018-11-26 LED classification device and method Pending CN111222523A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811416304.0A CN111222523A (en) 2018-11-26 2018-11-26 LED classification device and method

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Application Number Priority Date Filing Date Title
CN201811416304.0A CN111222523A (en) 2018-11-26 2018-11-26 LED classification device and method

Publications (1)

Publication Number Publication Date
CN111222523A true CN111222523A (en) 2020-06-02

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Country Status (1)

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CN (1) CN111222523A (en)

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