WO2013114642A1 - Led分類方法、led分類装置、led分類プログラムおよび記録媒体 - Google Patents
Led分類方法、led分類装置、led分類プログラムおよび記録媒体 Download PDFInfo
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- WO2013114642A1 WO2013114642A1 PCT/JP2012/066300 JP2012066300W WO2013114642A1 WO 2013114642 A1 WO2013114642 A1 WO 2013114642A1 JP 2012066300 W JP2012066300 W JP 2012066300W WO 2013114642 A1 WO2013114642 A1 WO 2013114642A1
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- chromaticity
- led
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Definitions
- 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.
- a white LED is usually used for such a backlight.
- the white LED is generally configured by combining a blue LED and a phosphor.
- white light is obtained by mixing the blue light emitted from the blue LED chip and the light emitted when the phosphor is excited by the blue light.
- green light and red light obtained by exciting the green phosphor and the red phosphor with blue light are mixed with blue light. I get white light.
- Patent Document 1 discloses a method capable of easily and quickly providing a phosphor capable of changing a white emission color obtained by a blue LED and a phosphor to a more uniform color tone in a manufacturing process.
- the phosphor material related to the coefficient obtained by applying the required emission color information is specified.
- the phosphor specific information including the type, composition ratio, and mixing ratio (part by weight) of the fluorescent material that substantially satisfies the required emission color information requested by the customer. It can be obtained quickly.
- Patent Document 2 discloses a method for quickly producing a white LED by obtaining the phosphor mixture concentration by software calculation without trial and error so that the white LED has high color reproducibility. Is disclosed. In this method, first, a process is performed in which the mixed spectrum obtained by mixing the light of two types of phosphors with adjusted concentrations and the light of the LED is brought close to the standard spectrum. Next, an area surrounded by the chromaticity coordinates of the three primary colors obtained by dividing the light mixture spectrum by the color filter is obtained, and a process for obtaining the chromaticity coordinate position of the white light constituting the three primary colors is performed. Such processing is executed by calculation.
- Patent Documents 1 and 2 are methods for determining the phosphor concentration and the like at the time of manufacturing the white LED.
- the phosphor has the desired concentration and amount even if the phosphor concentration is optimally determined as described above. It is very difficult to form a phosphor layer. For this reason, the density
- the characteristics of the blue LED and the light emitting layer vary among products, the peak wavelength of blue light varies among white LEDs. For this reason, since the balance of the light intensity of the excitation light of the phosphor and the blue light of the blue LED varies, the chromaticity varies among the white LEDs.
- FIG. 10 is a diagram showing an example of such chromaticity rank classification.
- only white LEDs having chromaticity distribution within the rectangular frame F within the predetermined range are selected and used.
- the frame F is divided into finer ranges, and is configured so that chromaticity can be ranked for each division.
- the chromaticity of the white LEDs in the group having a short peak wavelength of the blue light component is distributed in a range D11 indicated by a solid line.
- the peak wavelength is 444.7 nm
- the average value AVE11 of chromaticity is at a position indicated by a solid line circle.
- the chromaticity of the white LEDs of the group having a long blue light component peak wavelength is distributed in a range D12 indicated by a broken line.
- the peak wavelength is 446.2 nm
- the average value AVE12 of chromaticity is at a position indicated by a broken-line circle.
- the chromaticity of the white LED on the panel display that is transmitted through the liquid crystal panel is particularly a color filter.
- the variation range is expanded by dividing into groups of chromaticity variation ranges according to the peak wavelength of blue light. For this reason, a white LED appears out of the desired chromaticity rank range on the panel display of the liquid crystal panel. The reason for this will be described in detail below.
- the maximum value of the luminance of blue light on the display surface of the liquid crystal panel is the transmittance of the color filter (blue filter) of the liquid crystal panel through which the blue light is transmitted (and the liquid crystal from the LED light source such as an optical sheet or a diffusion plate). It includes a luminance reduction generated when passing through the optical member up to the panel) and the light intensity of the blue light emitted from the blue LED of the white LED (light intensity ⁇ transmittance).
- the white LED having the chromaticity classified into the predetermined chromaticity rank range as described above the deviation of the peak wavelength of the blue light component is about ⁇ 5 nm.
- the transmittance of the color filter (blue filter) tends to decrease as the wavelength is shorter. For this reason, when the peak wavelength of the blue light component is shifted as described above, the maximum value of the luminance of the blue light on the display surface of the liquid crystal panel differs.
- FIG. 11 is a graph showing the relationship between the emission spectrum of a blue LED in a white LED and the transmission characteristics of a color filter (blue filter).
- the vertical axis represents the transmittance of the color filter and the intensity of the emitted light of the blue LED.
- the peak wavelength of the blue light component when the center of the peak wavelength of the blue light component is set to 450 nm, the peak wavelength is shifted in the range of 445 nm to 455 nm.
- the spectrum of blue light having a peak wavelength of 455 nm is indicated by a broken line, and the spectrum of blue light having a peak wavelength of 445 nm is indicated by a one-dot chain line. Further, in the blue light spectrum, a portion exceeding the transmittance of the blue filter (shown by hatching in the figure) is cut.
- the amount of light cut by the blue filter differs between blue light having a peak wavelength of 455 nm and blue light having a peak wavelength of 445 nm.
- the shorter the peak wavelength of blue light the lower the transmittance of the blue filter, so the amount of light cut by the blue filter increases.
- the chromaticity of white light including blue light having a short peak wavelength is shifted to the yellow side by a small amount of the blue light when the white light passes through the color filter.
- the blue light component further decreases due to the effect of visibility (the ratio of the light component by the phosphor increases with respect to the blue light component).
- FIG. 12 is a graph showing the spectra of a plurality of white LEDs showing the same chromaticity.
- FIG. 13 is a diagram illustrating the chromaticity rank range of the emitted light of the white LED and the chromaticity rank range of the emitted light transmitted through the liquid crystal panel.
- each white LED shown in FIG. 12 the peak wavelength of blue light is shifted, but the chromaticity of each white LED is the same in the frame F shown in FIG.
- the color filter blue filter
- the amount of blue light is cut in accordance with the transmission characteristics, so the chromaticity distribution is shifted in the direction of higher chromaticity.
- the chromaticity is distributed in the frame Ftyp shifted from the frame F in the direction in which the x value and the y value increase. To do.
- chromaticity is distributed in a frame Fmin shifted in a direction in which the x value and the y value increase from the frame Ftyp.
- chromaticity is distributed in a frame Fmax shifted in a direction in which the x value and the y value decrease from the frame Ftyp.
- the white balance adjustment is performed on the liquid crystal panel so that the maximum luminance of the red light and the green light is increased. Therefore, it is necessary to adjust the balance with the maximum luminance of the blue light that has decreased below the desired luminance.
- a white balance adjustment causes a new problem that the display brightness of the liquid crystal panel decreases as a whole.
- the present invention has been made in view of the above-described problems, and the object thereof is chromaticity on a panel display which does not require a large white balance adjustment that leads to a decrease in display luminance on a liquid crystal panel.
- An object of the present invention is to provide a white LED that is selected so that the variation is within a desired range.
- an LED classification method includes an LED element that emits primary light and a phosphor that is excited by the primary light and emits secondary light having a longer wavelength than the primary light. If the chromaticity of the primary light of the LED that emits the combined light of the primary light and the secondary light is within a predetermined range, the LED can be used as a backlight of a liquid crystal display device
- An LED classification method for classifying as an object wherein a correction value of the chromaticity due to transmission of the primary light through a color filter in the liquid crystal display device is calculated for the total number of LEDs to be classified, and based on the correction value
- the LED classification device combines the LED element that emits primary light and the phosphor that is excited by the primary light and emits secondary light having a longer wavelength than the primary light. If the chromaticity of the primary light of the LED that emits the combined light of the secondary light and the secondary light is within a predetermined range, the LED classification device that classifies the LED as an object used for the backlight of the liquid crystal display device
- the correction value of the chromaticity due to the transmission of the primary light through the color filter in the liquid crystal display device is calculated for the total number of the LEDs to be classified, and the LEDs to be classified based on the correction value
- the chromaticity correction value assuming that the primary light has passed through the color filter is calculated for the total number of LEDs to be classified by the chromaticity correction step or the chromaticity correction means, and this correction value Based on the above, the chromaticity obtained for the total number of LEDs to be classified is corrected as the corrected chromaticity. Then, the LEDs are classified into chromaticity ranks by the chromaticity rank classification step or the chromaticity rank classification means.
- the LED classification method according to the present invention which is configured as described above, has an effect that it is possible to easily select LEDs that do not need to be reduced in luminance even when mounted on a backlight.
- FIG. 1 is a perspective view showing a schematic configuration of a liquid crystal display device 1 according to the present embodiment.
- FIG. 2 is a perspective view showing a schematic configuration of another liquid crystal display device 2 according to the present embodiment.
- FIG. 3 is a graph showing a transmission spectrum of the color filter 7 in the liquid crystal display devices 1 and 2.
- the liquid crystal display device 1 includes a backlight 3 and a liquid crystal panel 4.
- the backlight 3 is disposed on the back side of the liquid crystal panel 4, is an edge light type backlight that irradiates light on the entire surface of the liquid crystal panel 4, and includes a plurality of light emitting devices 5 and a light guide plate 6.
- the light emitting device 5 is a white LED that is mounted on the side of the light guide plate 6 at a predetermined interval and emits light toward the light guide plate 6 side.
- the white LED includes a blue LED and a red phosphor and a green phosphor that are excited by the blue light of the blue LED.
- the light guide plate 6 deflects the light emitted from the light emitting device 5 so as to be emitted to the liquid crystal panel 4 side.
- the liquid crystal panel 4 is filled with liquid crystal between two opposing transparent substrates, and the transmittance of light from the backlight 3 is changed by changing the alignment state of the liquid crystal in units of pixels configured in a matrix. change. Further, the liquid crystal panel 4 has a color filter 7 disposed on the display surface side. In the color filter 7, a filter for each color of red (R), green (G), and blue (B) having a transmission spectrum shown in FIG. 3 is formed for every three sub-pixels constituting each pixel. When light passes through each filter, the light of the color of each filter can be emitted.
- RGB red
- G green
- B blue
- liquid crystal panel 4 based on the light color component ratio of red (R), green (G), and blue (B) corresponding to the color of each pixel determined for each display image, transmission of the liquid crystal layer corresponding to the sub-pixel is performed. By adjusting the rate individually, each pixel is displayed in a color to be displayed.
- the liquid crystal display device 2 includes a backlight 8 and a liquid crystal panel 4.
- the backlight 8 is disposed on the back side of the liquid crystal panel 4 and is a direct type backlight that irradiates light on the entire surface of the liquid crystal panel 4, and includes a plurality of light emitting devices 5 and a mounting substrate 9.
- the light emitting device 5 is mounted on the entire surface of the mounting substrate 9 at a predetermined interval and emits light directly to the liquid crystal panel 4. Since the backlight 8 can modulate the brightness for each small region (for example, pixel), it is excellent in energy saving and can increase the contrast ratio between light and dark.
- FIG. 4 is a longitudinal sectional view showing a configuration of the LED 10 as the light emitting device 5 used in the above-described backlights 3 and 8.
- FIG. 5 is a graph showing an emission spectrum of the LED 10.
- a white LED used as the light emitting device 5 includes a frame 11, an LED chip 12, a lead frame 13, a wire 14, a resin 15, and phosphors 16 and 17.
- the frame 11 is disposed on the lead frame 13.
- the frame 11 is made of a nylon material and has a recess 11a.
- the inclined surface of the recess 11a is formed as a reflective surface that reflects the emitted light of the LED chip 12.
- the reflecting surface is preferably formed of a metal film containing silver or aluminum in order to efficiently extract the emitted light from the LED chip 12.
- the lead frame 13 is insert-molded in the frame body 11.
- the upper end portion of the lead frame 13 is divided and formed, and a part of the lead frame 13 is exposed at the bottom surface of the concave portion 11 a of the frame body 11.
- the lower end portion of the lead frame 13 is cut to a predetermined length and is bent along the outer wall of the frame body 11 to form an external terminal.
- the LED chip 12 (LED element) is, for example, a GaN-based semiconductor light-emitting element having a conductive substrate, and a bottom electrode is formed on the bottom surface of the conductive substrate, and an upper electrode is formed on the opposite surface.
- the outgoing light (primary light) of the LED chip 12 is blue light in the range of 430 to 480 nm and has a peak wavelength at 450 nm.
- the LED chip 12 is die-bonded with a conductive brazing material on one side of the upper end portion of the lead frame 13 exposed on the bottom surface of the recess 11a. Further, in the LED chip 12, the upper electrode and the other side of the upper end portion of the lead frame 13 are wire-bonded by a wire 14. Thus, the LED chip 12 is electrically connected to the lead frame 13.
- Resin 15 seals the recess 11a by filling the recess 11a. Further, since the resin 15 is required to have high durability with respect to primary light having a short wavelength, a silicone resin is preferably used.
- the phosphors 16 and 17 are dispersed in the resin 15.
- the phosphor 16 is a green phosphor that emits green secondary light having a longer wavelength than the primary light (peak wavelength is 500 nm or more and 550 nm or less), and is made of, for example, a Eu-activated ⁇ sialon phosphor material.
- the phosphor 17 is a red phosphor that emits red light having a longer wavelength than the primary light (peak wavelength is 600 nm or more and 780 nm or less).
- the phosphor 17 is made of a phosphor material mixed with CaAlSiN3: Eu. Become. By using such phosphors 16 and 17, it is possible to obtain a three-wavelength type LED 10 having good color rendering properties.
- the LED 10 configured as described above, as the primary light emitted from the LED chip 12 passes through the resin 15, a part thereof excites the phosphors 16 and 17 and is converted into secondary light.
- the outgoing light (combined light) in which the primary light and the secondary light are mixed is radiated to the outside as substantially white light.
- FIG. 5 is a graph showing the emission spectrum of the LED 10, where the vertical axis represents intensity (arbitrary unit) and the horizontal axis represents wavelength (nm).
- the emission spectrum of the three-wavelength type LED 10 is distributed so as to have peaks in blue, green and red, and the peak of blue light is the largest.
- the LED 10 uses specific phosphors 16 and 17 that are excited by blue light having a wavelength in the range of 430 to 480 nm in the primary light and emit light with high efficiency.
- the light-emitting device 5 which has the spectral characteristic adjusted according to the transmission characteristic of the liquid crystal display devices 1 and 2 can be obtained.
- FIG. 6 is a block diagram showing the configuration of the LED classification device 21.
- the LED classification device 21 shown in FIG. 6 realizes the LED classification method of this embodiment for classifying whether the LED 10 used as the light-emitting device 5 is a light-emitting device 5 suitable for the backlights 3 and 8. Used for.
- the LED classification device 21 includes a memory 22, a storage unit 23, a display unit 24, and an arithmetic processing unit 25 in order to classify the LEDs 10.
- the memory 22 is a volatile memory that temporarily stores a characteristic measurement value of the LED 10 from the LED characteristic measurement device 31 and temporarily stores calculation data generated by calculation processing by the calculation processing unit 25.
- the characteristic measurement values are stored in the memory 22 in a state in which codes assigned to the respective LEDs 10 are associated with each other so that the LEDs 10 can be identified with respect to the total number of the LEDs 10 to be classified.
- the LED characteristic measuring device 31 is a device that measures the characteristics of the LED 10, and measures the chromaticity, peak wavelength, and the like of each LED 10 in a state where a large number of LEDs 10 emit light, and outputs the measured values as characteristic measured values.
- the storage unit 23 is a storage device that stores the classification result of the LED 10 obtained by the arithmetic processing of the arithmetic processing unit 25, and includes a hard disk device or the like.
- the display unit 24 is a display device for displaying the above classification result.
- the arithmetic processing unit 25 performs processing for classifying the LEDs 10 based on the characteristic measurement values from the LED characteristic measurement device 31.
- the arithmetic processing unit 25 uses the following arithmetic expression to correct the chromaticity (x, y) of the emitted light from the LED 10 assuming that the emitted light from the LED 10 has passed through the color filter 7 (blue filter). Correction to chromaticity (x1, y1) (chromaticity correction means). Further, the arithmetic processing unit 25 performs chromaticity rank classification of the LED 10 based on the corrected chromaticity (x1, y1).
- the chromaticity (x, y) and the corrected chromaticity (x1, y1) are chromaticities converted by a common color matching function of a two-degree field of view.
- the chromaticity obtained by converting the spectrum data by the color matching function of the 10 degree visual field may be used. Therefore, the arithmetic processing unit 25 may correct the chromaticity using a color matching function with a 10 degree visual field.
- the chromaticity (x, y) calculated by the color matching function of the double field of view is exactly the same, the emitted light of the planar light source used for television or the like depends on the situation that the person actually sees. May look different colors. This is because the color appearance varies depending on the visual field range.
- the chromaticity adjustment is performed using a color matching function of a 10 degree visual field rather than a 2 degree visual field. It is preferable to homogenize the chromaticity by such a method because it looks uniform to humans.
- the color is judged twice as the visual field, and the sample having a similar distance of 8.7 cm is visually recognized.
- the 2-degree visual field has a viewing angle of 1 to 4 degrees, and the 10-degree visual field is suitably used when the viewing angle is 4 degrees or more.
- the chromaticity adjustment using the 10-degree field color matching function is applied to the chromaticity correction assuming the blue filter, but can also be applied to the chromaticity correction not assuming the blue filter. .
- correction is performed in consideration of a change in chromaticity until the light emitted from the light emitting device 5 passes through the liquid crystal panel 4.
- This change in chromaticity is caused when the emitted light from the light emitting device 5 is transmitted through optical members such as a diffusion plate, an optical sheet, and a light guide plate, the color filter 7 (blue filter), and the liquid crystal panel 4.
- optical members such as a diffusion plate, an optical sheet, and a light guide plate, the color filter 7 (blue filter), and the liquid crystal panel 4.
- the correction of the transmission characteristic of the color filter 7 is the correction of the transmission characteristic of the blue filter.
- this is because the deviation of the peak wavelength of the blue light component in the light emitted from the light emitting device 5 is large at the mass production level of the light emitting device 5. This is because the chromaticity of the emitted light greatly affects the deviation before and after transmission through the color filter 7.
- the correction is more suited to the display on the actual liquid crystal panel.
- the method of only correcting the transmission characteristics of the blue filter can be said to be a simple method of correcting the measurement data of the light emitting device 5 by a simple correction formula as will be described later.
- this correction method can eliminate the rank classification regarding the blue light peak, the characteristic classification items (management characteristic items) of the light emitting device 5 can be reduced.
- ⁇ p is a measured value of the peak wavelength of the blue light component in the light emitted from the LED 10. Since the influence on the chromaticity of blue light affects not only the peak wavelength but also the spectrum shape, this measurement is not a maximum point of emission intensity, but a dominant wavelength (main wavelength) that also takes into account the emission spectrum shape. Value.
- the dominant wavelength is measured, for example, by measuring the dominant wavelength as blue monochromatic light by extracting an emission spectrum of 480 nm or less. This measurement takes into account the influence of the blue LED light in the light emitting device 5 being absorbed by the phosphor.
- ⁇ 0 is the central value (average wavelength of variation) of the measured value of this peak wavelength, and is set in the range of 445 nm to 450 nm. This wavelength is calculated based on the peak wavelength of the blue light of the total number of LEDs 10, but the total number of LEDs 10 used in one set of the backlights 3 and 8 of the liquid crystal display devices 1 and 2 or more. It is desirable to calculate as an average value for the number of LEDs 10.
- ⁇ and ⁇ are coefficients and are set in the range of 0 to 0.01.
- the chromaticity (x, y) and the peak wavelength ⁇ p are acquired from the LED characteristic measurement device 31 as characteristic measurement values of the LED 10.
- the arithmetic processing unit 25 includes a coefficient calculation unit 26, a corrected chromaticity calculation unit 27, and a chromaticity rank classification unit 28 in order to realize the above processing.
- the coefficient calculation unit 26 (coefficient calculation means) stores the coefficient ⁇ of the arithmetic expression based on the chromaticity (x, y) and the peak wavelength ⁇ p as the characteristic measurement value stored in the memory 22 as the characteristic measurement value. And the coefficient ⁇ is calculated. Specifically, the coefficient calculation unit 26 performs the following processing.
- FIG. 7 is a diagram for explaining the processing, and the change in chromaticity after transmission of the blue light through the color filter with respect to the shift amount of the peak wavelength from the average wavelength of the peak wavelength of the blue light from the LED 10 to be classified. It is a graph which shows quantity.
- the coefficient calculation unit 26 obtains chromaticity assuming that light having an average wavelength ⁇ 0 has transmitted through the color filter 7 by simulation based on mutually different peak wavelengths ⁇ p of the two LEDs 10.
- the simulation used here is based on a function of the transmittance of the color filter 7. Specifically, from this function, the transmittance for the average wavelength ⁇ 0 is obtained, and the chromaticity is calculated based on the light intensity obtained by multiplying the transmittance with the light intensity for the average wavelength ⁇ 0.
- the two peak wavelengths ⁇ p are the peak wavelengths ⁇ p of the two LEDs 10 having the same chromaticity of the combined light, and are the peak wavelengths ⁇ p shifted from the average wavelength ⁇ 0 with the average wavelength ⁇ 0 as the center.
- the deviation from the average wavelength ⁇ 0 is about ⁇ 5 nm which is the maximum value.
- the coefficient calculation unit 26 calculates the average of the peak wavelengths ⁇ p for all the LEDs 10 stored in the memory 22 to obtain the average wavelength ⁇ 0 and stores the average wavelength ⁇ 0 in the memory 22.
- the coefficient calculation unit 26 uses the chromaticity obtained as described above as the reference chromaticity (x0, y0), and the change amount of the chromaticity with respect to the two peak wavelengths ⁇ p from the reference chromaticity (x0, y0).
- ⁇ x and ⁇ y are obtained by simulation.
- the simulation used here is based on a function of the transmittance of the color filter 7. Specifically, from this function, the respective transmittances for the two peak wavelengths ⁇ p are obtained, and the chromaticity is calculated based on the light intensity obtained by multiplying the transmittance and the light intensity for the two peak wavelengths ⁇ p.
- the difference between the chromaticity and the reference chromaticity (x0, y0) is calculated as the change amounts ⁇ x, ⁇ y.
- the coefficient calculation unit 26 is a straight line connecting two points specified by the two peak wavelengths ⁇ p and the two variations ⁇ x and ⁇ y corresponding to the peak wavelengths ⁇ p.
- the slopes of Lx and Ly are obtained as coefficients ⁇ and ⁇ and stored in the memory 22.
- the correction chromaticity calculation unit 27 (correction chromaticity calculation means) applies the coefficients ⁇ and ⁇ stored in the memory 22 to the arithmetic expression, and calculates the peak wavelength ⁇ p for all the LEDs 10 read from the memory 22. Thus, the corrected chromaticity (x1, y1) is calculated.
- the corrected chromaticity calculation unit 27 stores the calculated corrected chromaticity (x1, y1) in the memory 22.
- ( ⁇ p ⁇ 0) in the arithmetic expression is the difference (wavelength shift amount) between the peak wavelength ⁇ p and the average wavelength ⁇ 0, and as shown in FIG. 7, the chromaticity change amounts ⁇ x and ⁇ y with respect to the wavelength shift amount are linear. Approximately obtained.
- a correction value for chromaticity (x, y) can be obtained by multiplying the wavelength shift amount by the above-mentioned coefficients ⁇ and ⁇ . Then, the corrected chromaticity (x1, y1) is obtained by subtracting the correction value from the chromaticity (x, y) read from the memory 22.
- the chromaticity rank classification unit 28 (chromaticity rank classification means) reads the corrected chromaticity (x1, y1) from the memory 22, and performs the chromaticity rank classification of the LED 10 based on the corrected chromaticity (x1, y1). .
- FIG. 8 is a diagram illustrating an example of such chromaticity rank classification. As shown in FIG. 8, the chromaticity rank classification unit 28 classifies the LEDs 10 based on whether or not the corrected chromaticity (x1, y1) is distributed within a rectangular frame F within a predetermined range, and stores the result. The unit 23 is stored in a state associated with the code of the LED 10. Further, the chromaticity rank classification unit 28 causes the display unit 24 to display the classification result of the LED 10 stored in the memory 22 as the LED 10 to be selected together with the code.
- the above frame F is divided into finer ranges, and is configured so that the chromaticity can be ranked for each division.
- the corrected chromaticity (x1, y1) of the group of LEDs 10 having a short blue light wavelength is distributed in a range D1 indicated by a solid line.
- the peak wavelength is 444.7 nm
- the chromaticity average value AVE1 is at the position indicated by the solid line circle.
- the chromaticity of the group of LEDs 10 having a long blue light wavelength is distributed in a range D2 indicated by a broken line.
- the peak wavelength is 446.2 nm
- the average value AVE2 of chromaticity is at a position indicated by a broken-line circle.
- Each block of the coefficient calculation unit 26, the corrected chromaticity calculation unit 27, and the chromaticity rank classification unit 28 in the arithmetic processing unit 25 is realized by software (LED classification program) using a CPU as follows. That is, the LED classification program causes the computer to function as the LED classification device 21 (the coefficient calculation unit 26, the corrected chromaticity calculation unit 27, and the chromaticity rank classification unit 28).
- each said block may be comprised by a hardware logic, and may be implement
- DSP Digital * Signal * Processor
- the program code (execution format program, intermediate code program, source program) of the above software may be recorded on a computer-readable recording medium.
- the object of the present invention can also be achieved by supplying the recording medium to the LED classification device 21 and reading and executing the program code recorded on the recording medium by the CPU.
- the recording medium examples include magnetic tapes such as magnetic tapes and cassette tapes, magnetic disks such as floppy (registered trademark) disks / hard disks, and optical disks such as CD-ROM / MO / MD / BD / DVD / CD-R. Can be used.
- a card system such as an IC card (including a memory card) / optical card or a semiconductor memory system such as a mask ROM / EPROM / EEPROM (registered trademark) / flash ROM can be used. .
- the LED classification device 21 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network.
- the communication network is not particularly limited.
- the Internet intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available.
- the transmission medium constituting the communication network is not particularly limited.
- wired such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL line, etc.
- infrared rays such as IrDA and remote control, Bluetooth (Registered trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used.
- the present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.
- FIG. 9 is a flowchart showing the procedure of the classification process.
- the characteristic measurement values from the LED characteristic measurement device 31 are acquired for the total number of LEDs 10 to be classified, and stored in the memory 22 (step S1).
- coefficients ⁇ and ⁇ are calculated based on the simulation using the acquired characteristic measurement values (step S2: coefficient calculation process, chromaticity correction process).
- the coefficient calculation unit 26 determines the slopes of the straight lines Lx and Ly connecting the two points as the coefficients ⁇ and ⁇ as described above.
- the corrected chromaticity (x1, y1) is calculated using the above-described arithmetic expression and the above-described coefficients ⁇ , ⁇ (step S3: corrected chromaticity calculating step, chromaticity correcting step).
- the corrected chromaticity calculation unit 27 calculates the corrected chromaticity (x1, y1) using the measured chromaticity (x, y) and the peak wavelength ⁇ p for the total number of LEDs 10 to be classified.
- the chromaticity rank classification of the LED 10 is performed based on the corrected chromaticity (x1, y1) (step S4: chromaticity rank classification process).
- the chromaticity rank classification unit 28 performs the chromaticity rank classification of the LEDs 10 depending on whether or not the correction chromaticity (x1, y1) is distributed within the frame F shown in FIG. If the corrected chromaticity (x1, y1) is within a predetermined range by this chromaticity rank classification, the LED 10 indicating the corrected chromaticity (x1, y1) is classified as an object to be used for the backlights 3 and 8.
- the LED classification device 21 corrects the chromaticity (x, y) after transmission through the color filter 7 as the corrected chromaticity (x1, y1) by the arithmetic processing unit 25, and this corrected chromaticity (x1) , Y1), the chromaticity rank classification of the LED 10 is performed.
- the corrected chromaticity (x1, y1) is calculated so that the chromaticity (x, y) is shifted to blue (the lower chromaticity).
- the corrected chromaticity (x1, y1) is calculated so that the chromaticity (x, y) shifts to yellow (the higher chromaticity) for the LED 10 whose peak wavelength ⁇ p is shifted to the shorter one ( Reference: Average value AVE1 in FIG.
- the corrected chromaticity (x1, y1) corrected in this way a decrease in the intensity of blue light (shift amount) by the color filter 7 can be predicted and the chromaticity rank classification of the LED 10 can be performed. it can.
- the LEDs 10 selected based on the chromaticity rank classification on the backlights 3 and 8 in the liquid crystal display devices 1 and 2, it is possible to suppress variations in luminance of the blue light in the liquid crystal panel 4. it can.
- the blue light component is largely cut by the color filter 7 and the chromaticity is shifted to the yellow side. Therefore, by performing the above chromaticity correction, it is possible to perform chromaticity rank classification more appropriate as a light source for a liquid crystal panel.
- the LED 10 having high and low chromaticity distribution is also used.
- the LED characteristic measurement device 31 can obtain the wavelength of blue light by measuring the peak wavelength. However, since the measurement of the peak wavelength is likely to cause noise, errors are likely to occur. In order to suppress the influence of noise, the LED characteristic measuring device 31 specifies a wavelength range from 400 nm until the phosphor color component does not appear on the long wavelength side, and calculates the dominant wavelength (main wavelength) in this wavelength range. do it. As described above, for example, a dominant wavelength as blue monochromatic light is measured by extracting an emission spectrum of 480 nm or less. This measurement takes into account the influence of the blue LED light in the light emitting device 5 being absorbed by the phosphor.
- the LED classification method and the LED classification device according to this embodiment can be expressed as follows.
- the LED classification method combines the primary light and the secondary light by combining an LED element that emits primary light and a phosphor that is excited by the primary light and emits secondary light having a longer wavelength than the primary light.
- the LED classification device combines the primary light and the phosphor by combining an LED element that emits primary light and a phosphor that is excited by the primary light and emits secondary light having a longer wavelength than the primary light. If the chromaticity of the primary light of the LED that emits the combined light with the secondary light is within a predetermined range, the LED classification device classifies the LED as a target used for the backlight of the liquid crystal display device, The correction value of the chromaticity due to the transmission of the primary light through the color filter in the liquid crystal display device is calculated for the total number of the LEDs to be classified, and the total number of the LEDs to be classified is calculated based on the correction value. A chromaticity correction unit that corrects chromaticity as correction chromaticity, and a chromaticity rank classification unit that classifies the LEDs based on the corrected chromaticity.
- the chromaticity correction step calculates an average wavelength of peak wavelengths of the primary light obtained for the total number of the LEDs to be classified, and the primary light having the average wavelength is A reference chromaticity when passing through a color filter and a change amount of the chromaticity with respect to the reference chromaticity are calculated, and a slope of the change amount with respect to a shift amount of the peak wavelength from the average wavelength is corrected for the chromaticity.
- the method further includes a corrected chromaticity calculating step of calculating the corrected chromaticity by subtracting from the obtained chromaticity.
- the chromaticity correction unit calculates an average wavelength of peak wavelengths of the primary light obtained for the total number of the LEDs to be classified, and the primary light having the average wavelength. Calculating a reference chromaticity when the light passes through the color filter and a change amount of the chromaticity with respect to the reference chromaticity, and calculating a slope of the change amount with respect to a shift amount of the peak wavelength from the average wavelength.
- a coefficient calculator that calculates the correction value as a coefficient, and the correction value is calculated by multiplying the difference between the peak wavelength and the average wavelength by the coefficient, and the correction value is the total number of the LEDs to be classified. It is preferable to have a corrected chromaticity calculation unit that calculates the corrected chromaticity by subtracting from the obtained chromaticity.
- the coefficient of the correction value is calculated based on the gradient of the chromaticity change amount with respect to the reference chromaticity obtained by assuming that the color filter has passed through the coefficient calculation process or the coefficient calculation unit. Therefore, a change in chromaticity due to transmission of the primary light color filter is reflected in the correction value. Then, the corrected chromaticity is calculated by subtracting the correction value obtained in this way from the chromaticity by the corrected chromaticity calculating step or the corrected chromaticity calculating unit.
- the primary light is blue light.
- the chromaticity rank is appropriately classified based on the change in the chromaticity distribution by the color filter by correcting the chromaticity by predicting the change due to the transmission of the color filter as described above. Can do.
- the chromaticity correction step or the chromaticity correction unit corrects the chromaticity using a color matching function of a 10 degree field of view.
- the chromaticity visible to the human eye is homogenized, so that it appears uniform to the human and is adjusted to the desired chromaticity.
- the LED classification program is a program for causing a computer to function as each unit in the LED classification apparatus.
- the recording medium is a computer-readable recording medium that records the LED classification program.
- the fluorescent substance which LED10 contains is not limited to this.
- a yellow phosphor that is excited by blue light of a blue LED may be included.
- pseudo white can be obtained by mixing the blue light of the blue LED and the yellow light of the yellow phosphor.
- the LED characteristic measuring device 31 is provided outside the LED classification device 21, but may be provided as a part of the LED classification device 21.
- the LED classification method according to the present invention corrects the chromaticity of the LED by predicting the luminance change in the state of being transmitted through the color filter, and thus can be suitably used for a liquid crystal display device using an LED as a backlight.
Abstract
Description
〔液晶表示装置の構成〕
図1は、本実施形態に係る液晶表示装置1の概略構成を示す斜視図である。図2は、本実施形態に係る他の液晶表示装置2の概略構成を示す斜視図である。図3は、液晶表示装置1,2におけるカラーフィルタ7の透過スペクトルを示すグラフである。
図4は、前述のバックライト3,8に用いられる発光装置5としてのLED10の構成を示す縦断面図である。図5は、LED10の発光スペクトルを示すグラフである。
図6は、LED分類装置21の構成を示すブロック図である。
メモリ22は、LED特性測定装置31からのLED10の特性測定値を一時的に記憶したり、演算処理部25による演算処理で生じる演算データを一時的に記憶したりする揮発性のメモリである。特性測定値は、分類の対象となるLED10の全数について、LED10を特定できるように各LED10に付与されたコードが対応付けられた状態でメモリ22に記憶される。LED特性測定装置31は、LED10の特性を測定する装置であり、多数のLED10を発光させた状態で各LED10の色度やピーク波長等を測定して特性測定値として出力する。
演算処理部25は、LED特性測定装置31からの特性測定値に基づいて、LED10を分類するための処理を行う。この演算処理部25は、下記の演算式を用いて、LED10の出射光の色度(x,y)をLED10の出射光が前述のカラーフィルタ7(青色フィルタ)を透過したことを想定した補正色度(x1,y1)に補正する(色度補正手段)。また、演算処理部25は、補正色度(x1,y1)に基づいてLED10の色度ランク分類を行う。
y1=y-β×(λp-λ0)
上記の演算式において、λpは、LED10の出射光における青色光成分のピーク波長の測定値である。青色光の色度に対する影響は、ピーク波長だけでなく、スペクトル形状も影響するので、この測定値は、発光強度の最大点ではなく、発光スペクトル形状も加味されるドミナント波長(主波長)の測定値とする。ドミナント波長の測定は、例えば、480nm以下の発光スペクトルを抜き出すことによって、青色単色光としてのドミナント波長を測定することで行われる。この測定は、発光装置5内の青色LED光が蛍光体に吸収される影響を加味したものとなっている。
係数算出部26(係数算出手段)は、メモリ22に記憶されている、LED特性測定装置31からの特性測定値としての色度(x,y)およびピーク波長λpに基づいて演算式の係数αおよび係数βを算出する。具体的には、係数算出部26は次の処理を行う。図7は、その処理を説明するための図であり、分類対象となるLED10からの青色光のピーク波長の平均波長からのピーク波長のシフト量に対する青色光のカラーフィルタ透過後の色度の変化量を示すグラフである。
補正色度算出部27(補正色度算出手段)は、メモリ22に記憶された係数α,βを演算式に適用し、メモリ22から読み出した全数のLED10についてのピーク波長λpに対して演算式により補正色度(x1,y1)を計算する。補正色度算出部27は、算出した補正色度(x1,y1)をメモリ22に記憶させる。
色度ランク分類部28(色度ランク分類手段)は、補正色度(x1,y1)をメモリ22から読み出し、当該補正色度(x1,y1)に基づいて、LED10の色度ランク分類を行う。図8は、このような色度ランク分類の一例を示す図である。色度ランク分類部28は、図8に示すように、所定の範囲となる矩形の枠F内に補正色度(x1,y1)が分布するか否かでLED10を分類し、その結果を記憶部23にLED10のコードと対応付けた状態で保存させる。また、色度ランク分類部28は、メモリ22に保存されたLED10の分類結果を選別すべきLED10として表示部24にコードとともに表示させる。
演算処理部25における係数算出部26、補正色度算出部27および色度ランク分類部28の各ブロックは、以下のようにCPUを用いてソフトウェア(LED分類プログラム)によって実現される。つまり、このLED分類プログラムは、コンピュータをLED分類装置21(係数算出部26、補正色度算出部27および色度ランク分類部28)として機能させる。
LED分類装置21によるLED10の分類処理について、図9のフローチャートを参照して説明する。図9は、その分類処理の手順を示すフローチャートである。
上記のように、LED分類装置21は、演算処理部25によって、カラーフィルタ7の透過後の色度(x,y)を補正色度(x1,y1)として補正し、この補正色度(x1,y1)に基づいてLED10の色度ランク分類を行うように構成されている。
蛍光体16,17を含むLED10は、発光スペクトルが蛍光体色の成分も含む形となるので、LED特性測定装置31において、ピーク波長を測定することによって、青色光の波長を得ることができる。しかしながら、ピーク波長の測定はノイズが乗りやすいので、誤差が生じやすい。ノイズの影響を抑えるには、LED特性測定装置31において、400nmから長波長側に蛍光体色の成分が現れないまでの波長範囲を指定して、この波長範囲でドミナント波長(主波長)を計算すればよい。前述のように、例えば、480nm以下の発光スペクトルを抜き出すことによって、青色単色光としてのドミナント波長を測定する。この測定は、発光装置5内の青色LED光が蛍光体に吸収される影響を加味したものとなっている。
本実施形態に係るLED分類方法およびLED分類装置は、下記のようにも表現することができる。
2 液晶表示装置
3 バックライト
4 液晶パネル
5 発光装置
7 カラーフィルタ
8 バックライト
10 LED
12 LEDチップ(LED素子)
16 蛍光体
17 蛍光体
21 LED分類装置
22 メモリ
23 記憶部
24 表示部
25 演算処理部
26 係数算出部(色度補正手段,係数算出手段)
27 補正色度算出部(色度補正手段,補正色度算出手段)
28 色度ランク分類部(色度ランク分類手段)
31 LED特性測定装置
F 枠(所定の範囲)
α 係数
β 係数
λ0 平均波長
λp ピーク波長
(x,y) 色度
(x0,y0) 基準色度
(x1,y1) 補正色度
Δx,Δy 変化量
Claims (10)
- 1次光を発するLED素子と前記1次光によって励起して前記1次光よりも長波長の2次光を発する蛍光体とを組み合わせることにより前記1次光と前記2次光との合成光を発するLEDの前記1次光の色度が所定の範囲内にあれば、当該LEDを液晶表示装置のバックライトに用いられる対象として分類するLED分類方法であって、
前記1次光の前記液晶表示装置におけるカラーフィルタの透過による前記色度の補正値を分類対象となる前記LEDの全数について算出し、当該補正値に基づいて分類対象となる前記LEDの全数について前記色度を補正色度として補正する色度補正工程と、
前記補正色度に基づいて前記LEDを色度ランク分類する色度ランク分類工程とを含んでいることを特徴とするLED分類方法。 - 前記色度補正工程は、
分類対象となる前記LEDの全数について得られた前記1次光のピーク波長の平均波長を算出し、当該平均波長を有する前記1次光が前記カラーフィルタを透過したときの基準色度と当該基準色度に対する前記色度の変化量とを算出し、前記平均波長からの前記ピーク波長のシフト量に対する前記変化量の傾きを前記色度の補正値の係数として算出する係数算出工程と、
前記補正値を前記ピーク波長と前記平均波長との差に前記係数を乗算することによって算出し、当該補正値を分類対象となる前記LEDの全数について得られた前記色度からそれぞれ減算することにより前記補正色度を算出する補正色度算出工程とを含んでいることを特徴とする請求項1に記載のLED分類方法。 - 前記1次光が青色光であることを特徴とする請求項1または2に記載のLED分類方法。
- 前記色度補正工程は、10度視野の等色関数を用いて前記色度を補正することを特徴とする請求項1、2または3に記載のLED分類方法。
- 1次光を発するLED素子と前記1次光によって励起して前記1次光よりも長波長の2次光を発する蛍光体とを組み合わせることにより前記1次光と前記2次光との合成光を発するLEDの前記1次光の色度が所定の範囲内にあれば、当該LEDを液晶表示装置のバックライトに用いられる対象として分類するLED分類装置であって、
前記1次光の前記液晶表示装置におけるカラーフィルタの透過による前記色度の補正値を分類対象となる前記LEDの全数について算出し、当該補正値に基づいて分類対象となる前記LEDの全数について前記色度を補正色度として補正する色度補正手段と、
前記補正色度に基づいて前記LEDを色度ランク分類する色度ランク分類手段とを備えていることを特徴とするLED分類装置。 - 前記色度補正手段は、
分類対象となる前記LEDの全数について得られた前記1次光のピーク波長の平均波長を算出し、当該平均波長を有する前記1次光が前記カラーフィルタを透過したときの基準色度と当該基準色度に対する前記色度の変化量とを算出し、前記平均波長からの前記ピーク波長のシフト量に対する前記変化量の傾きを前記色度の補正値の係数として算出する係数算出手段と、
前記補正値を前記ピーク波長と前記平均波長との差に前記係数を乗算することによって算出し、当該補正値を分類対象となる前記LEDの全数について得られた前記色度から減算することにより前記補正色度を算出する補正色度算出手段とを有していることを特徴とする請求項5に記載のLED分類装置。 - 前記1次光が青色光であることを特徴とする請求項5または6に記載のLED分類装置。
- 前記色度補正手段は、10度視野の等色関数を用いて前記色度を補正することを特徴とする請求項5、6または7に記載のLED分類装置。
- コンピュータを請求項5から8のいずれか1項に記載のLED分類装置における各手段として機能させることを特徴とするLED分類プログラム。
- 請求項9に記載のLED分類プログラムを記録したコンピュータ読み取り可能な記録媒体。
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CN104081546A (zh) | 2014-10-01 |
JP2017108184A (ja) | 2017-06-15 |
US20150019168A1 (en) | 2015-01-15 |
JP6207826B2 (ja) | 2017-10-04 |
TW201421002A (zh) | 2014-06-01 |
TWI495856B (zh) | 2015-08-11 |
JP2017223969A (ja) | 2017-12-21 |
US20150268408A1 (en) | 2015-09-24 |
TW201331571A (zh) | 2013-08-01 |
TWI461685B (zh) | 2014-11-21 |
JPWO2013114642A1 (ja) | 2015-05-11 |
JP5781631B2 (ja) | 2015-09-24 |
JP2013179254A (ja) | 2013-09-09 |
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