WO2007136060A1 - 色温度補正装置及びディスプレイ装置 - Google Patents
色温度補正装置及びディスプレイ装置 Download PDFInfo
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- WO2007136060A1 WO2007136060A1 PCT/JP2007/060437 JP2007060437W WO2007136060A1 WO 2007136060 A1 WO2007136060 A1 WO 2007136060A1 JP 2007060437 W JP2007060437 W JP 2007060437W WO 2007136060 A1 WO2007136060 A1 WO 2007136060A1
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- Prior art keywords
- gradation value
- color temperature
- video signal
- light emission
- temperature correction
- Prior art date
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 86
- 239000003086 colorant Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 23
- 238000000034 method Methods 0.000 description 13
- 238000005259 measurement Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2003—Display of colours
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/73—Colour balance circuits, e.g. white balance circuits or colour temperature control
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
Definitions
- the present invention relates to a color temperature correction device that performs color temperature correction of a display panel, and a display device that includes the color temperature correction device.
- Plasma display panel devices using plasma display panels that can be made thinner and larger are widely known.
- this plasma display panel device an image is displayed by using light emission from discharge cells constituting pixels. More specifically, a high voltage driving pulse is applied between the electrodes constituting the discharge cell by a driving circuit to cause the discharge cell to emit light, and an image is displayed by light emission of each pixel.
- Patent Document 1 Japanese Patent No. 2994630
- the luminance measurement value actually obtained by the input gradation value is different from the target luminance ideal value by the input gradation value, and as a result, depending on the video signal, The color temperature to be expressed may be different.
- an object of the present invention is to measure the luminance actually obtained for the input gradation value of the video signal. It is an object to provide a color temperature correction device that corrects a change in color temperature that occurs when a constant value deviates from the ideal luminance value, and a display device including the color temperature correction device. Means for solving the problem
- the color temperature correction device is a display device that expresses the brightness of RGB of a video signal by multiple levels of gradation!
- a color temperature correction device for correcting the color temperature of the video signal is a display device that expresses the brightness of RGB of a video signal by multiple levels of gradation!
- Recording means for storing a gradation value conversion table for each of the RGB set gradation values in order to keep the color temperature constant for the input gradation values of the video signal;
- a gradation value conversion unit for converting the input gradation value into a set gradation value based on the gradation value conversion table
- the gradation value conversion table includes:
- a first gradation value conversion table showing the relationship between the input gradation value of the video signal and the ideal luminance value of each RGB for keeping the color temperature constant;
- a second gradation value conversion table showing a relationship with the set gradation value from which the ideal luminance value is obtained
- the gradation value conversion table may include a correspondence to an input gradation value force setting gradation value for each drive mode.
- the gradation value conversion unit can convert the input gradation value to the set gradation value according to the selected drive mode based on the gradation value conversion table.
- a display device includes inverse gamma correction means for performing inverse gamma correction on a gamma-corrected video signal;
- the color temperature correction device that corrects the color temperature of the inverse gamma corrected video signal, the average luminance detecting means that detects the average luminance of the color temperature corrected video signal, and Driving mode selection means for selecting a driving mode and outputting a multiplication coefficient;
- the output multiplication coefficient is multiplied by the set gradation value of the video signal corrected for color temperature.
- a multiplier that outputs a set gradation value in which a luminance difference due to the drive mode is corrected; a subfield conversion unit that sets a subfield condition based on the set gradation value and the set drive mode;
- the display device includes a reverse gamma correction unit that performs reverse gamma correction on a gamma-corrected video signal;
- Average luminance detecting means for detecting the average luminance of the inverse gamma-corrected video signal; driving mode selecting means for selecting a driving mode based on the detected average luminance and outputting a multiplication coefficient;
- the color temperature correction device that corrects the color temperature of the video signal based on the selected drive mode
- a multiplier that multiplies the output gradation coefficient by a set gradation value of the video signal that has undergone color temperature correction and outputs a set gradation value that corrects a luminance difference due to the drive mode;
- Subfield conversion means for setting a subfield condition based on the set gradation value and the set drive mode
- the color temperature correction means is a color temperature correction device for correcting the color temperature of the video signal in a display device that expresses the luminance of RGB of the video signal by a plurality of levels of gradation.
- storage means for recording a light emission pulse number conversion table for each set light emission number of RGB for white, and the light emission pulse number conversion table Based on the above, a light emission pulse number conversion unit that converts the number of light emission pulses input to the RGB into a set light emission pulse number for each RGB, and the set gradation value is obtained by dividing the set light emission pulse number by the drive multiple.
- the light emission pulse number conversion table includes:
- the first emission pulse number conversion table showing the relationship between the RGB ideal luminance values for each of the white RGB colors so as to keep the color temperature constant for the number of input light emission pulses of the video signal, and the set emission for obtaining the ideal luminance value.
- the second emission pulse number conversion table showing the relationship with the pulse number
- a display device comprises inverse gamma correction means for performing inverse gamma correction on a gamma-corrected video signal;
- Average luminance detecting means for detecting the average luminance of the inverse gamma-corrected video signal; driving mode selecting means for selecting a driving mode based on the detected average luminance and outputting a multiplication coefficient;
- a multiplier for multiplying an input gradation value of the video signal by an output multiplication coefficient and outputting an input gradation value obtained by correcting a luminance difference according to the driving mode
- the input gradation value is multiplied by the drive multiple of the drive mode to calculate the number of input light emission pulses, and the input light emission pulse number is converted into a set light emission pulse number so as to keep the color temperature constant.
- the color temperature correction device which performs temperature correction, and outputs the set gradation value by dividing the set number of light emission pulses by the drive multiple;
- Subfield conversion means for setting a subfield condition based on the set gradation value and the set drive mode; A display panel;
- the color temperature correction apparatus of the present invention it is possible to correct the color temperature of the video signal so as to keep the color temperature constant for the input gradation value.
- FIG. 1 is a block diagram showing a configuration of a color temperature correction apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is a schematic diagram illustrating a gradation value conversion method in the color temperature correction method according to the first embodiment of the present invention.
- FIG. 3 is a diagram showing a conversion table between input gradation values and set gradation values.
- FIG. 4 is a flowchart of a color temperature correction method according to Embodiment 1 of the present invention.
- FIG. 5 is a block diagram showing a configuration of a plasma display device according to Embodiment 1 of the present invention.
- FIG. 6 is a block diagram showing a configuration of a color temperature correction apparatus according to Embodiment 2 of the present invention.
- FIG. 7 is a diagram showing a relationship between a gradation value and a luminance measurement value for each driving mode (1 to 6 times) for green (G).
- FIG. 8 is a flowchart of a color temperature correction method according to Embodiment 2 of the present invention.
- FIG. 9 is a block diagram showing a configuration of a plasma display device according to Embodiment 2 of the present invention.
- FIG. 10 is a block diagram showing a configuration of a color temperature correction apparatus according to Embodiment 3 of the present invention.
- FIG. 11 is a diagram showing a relationship between the number of light emission pulses and a luminance measurement value when the drive mode is 1 ⁇ .
- FIG. 12 is a diagram showing the relationship between the number of light emission pulses and the measured luminance when the driving mode is doubled. 13] A diagram showing the relationship between the number of light emission pulses and the measured luminance when the driving mode is 3 times.
- FIG. 14 is a diagram showing the relationship between the number of light emission pulses and the measured luminance when the driving mode is 4 times.
- FIG. 15 is a diagram showing the relationship between the number of light emission pulses and the measured luminance when the driving mode is 5 times.
- FIG. 16 is a diagram showing the relationship between the number of light emission pulses and the measured luminance when the driving mode is 6 times.
- FIG. 17 is a diagram showing the relationship between the number of light emission pulses and the measured luminance value for all drive modes in the color temperature correction apparatus according to Embodiment 3 of the present invention.
- FIG. 18 is a diagram for explaining a method for converting the number of emitted light pulses in the color temperature correction apparatus according to the third embodiment of the present invention.
- FIG. 19 is a diagram showing a conversion table between the number of input light emission pulses and the set number of light emission pulses.
- FIG. 20 is a flowchart of a color temperature correction method according to the third embodiment of the present invention.
- FIG. 21 is a block diagram showing a configuration of a plasma display device according to Embodiment 3 of the present invention.
- a color temperature correction apparatus according to an embodiment of the present invention and a plasma display apparatus including the color temperature correction apparatus will be described in detail with reference to the accompanying drawings.
- substantially the same members are denoted by the same reference numerals.
- a color temperature correction apparatus 10 according to Embodiment 1 of the present invention will be described with reference to the block diagram of FIG.
- This color temperature correction device 10 stores a gradation value conversion table 6 for each gradation value set for each of RGB colors in order to keep the color temperature constant for the input gradation value of the video signal.
- Means 4 and a tone value conversion unit 2 for converting the input tone value into a set tone value based on the tone value conversion table 6 are provided.
- a color value is converted by converting an input gradation value into a set gradation value using a gradation value conversion table 6 prepared in advance according to the characteristics of the display device. The temperature can be kept constant.
- a color temperature correction method performed by the color temperature correction apparatus 10 will be described with reference to FIGS. 2 and 3 and a flowchart of FIG.
- the ideal luminance values for each of the white RGB colors are set to keep the color temperature constant for the input tone value of the video signal.
- the relationship of the ideal luminance value to the input gradation value is expressed as the first gradation value conversion table (Fig. 2: —dotted line). Therefore, based on the first gradation value conversion table, ideal luminance values of RGB for white color are obtained for the input gradation values (S02).
- the ideal luminance value of red (R) is 105 (Fig. 2: Procedure (i)). Note that the ideal luminance values are obtained in the same way for green (G) and blue (B), but the details are omitted.
- each set gradation value of RGB which is white is obtained for the input gradation value so as to keep the color temperature constant.
- the input tone value 230 is converted to the set tone value 220.
- the relationship between the set tone values for each of the white and white RGB colors that keep the color temperature constant is expressed as a tone value conversion table as shown in FIG.
- This gradation value conversion table (Fig. 3) should be expressed as a combination of the first gradation value conversion table (Fig. 2: dotted line) and the second gradation value conversion table (Fig. 2: solid line). Can do.
- plasma display device 30 is provided with a reverse gamma correction unit 12 that performs reverse gamma correction on a gamma-corrected video signal, and an input tone value of the video signal that has been reverse gamma corrected by the reverse gamma correction unit.
- Color temperature correction device 10 that converts the set gradation values of each of the white RGB colors to correct the color temperature so as to maintain a constant color, and an average luminance detection means that detects the average luminance of the video signal that has been subjected to the color temperature correction 14 and drive mode selection means 16 for selecting the detected average luminance power drive mode (drive multiple) and outputting the multiplication coefficient according to the drive mode, and the video signal with the color temperature corrected for the output multiplication coefficient Multiplier 18 that outputs the gradation value corrected for the brightness difference due to the drive mode, and subfield settings based on the set drive mode information (drive multiple, subfield number, etc.)
- a subfield transformation unit 22 for performing a plasma display panel (PDP) 24 for displaying an image, based on the settings for the sub-field, scan
- the scanning “maintenance” erasure driving circuit 26 that controls the sustaining and erasing, and the data driving circuit 28 are configured.
- the plasma display device 30 includes the color temperature correction device 10 described above. Since the plasma display device
- a color temperature correction apparatus 10a according to Embodiment 2 of the present invention will be described with reference to the block diagram of FIG.
- the color temperature correction device 10a according to the second embodiment is different from the color temperature correction device according to the first embodiment in that it has gradation value conversion tables 6a, 6b,. Is different.
- the input gradation value power is appropriately determined based on the gradation value conversion table corresponding to the selected driving mode. Conversion to a set gradation value can be performed.
- FIG. 7 is a diagram showing the relationship between the gradation value and the luminance measurement value in each of the driving modes 1 to 6 times for green (G).
- the color temperature correction apparatus according to Embodiment 1 described above has only one gradation value conversion table for a specific drive mode for the input gradation value.
- various drive modes are used depending on the average brightness. For example, in the case of an integer multiple of 1 to 6 times, or a drive mode with a drive multiple including decimal places such as 0.9 times, 1.1 times, and 1.3 times is used. In this case, as shown in Fig.
- the color temperature correction apparatus 10a has a plurality of gradation value conversion tables 6a, 6b,... to this Therefore, the input tone value force can be appropriately converted into the set tone value based on the tone value conversion table corresponding to the selected drive mode.
- the RGB ideal brightness values for white are set in advance so as to keep the color temperature constant for the input tone value of the video signal.
- the relationship of the ideal luminance value to the input gradation value is expressed as the first gradation value conversion table. Therefore, based on the first gradation value conversion table corresponding to the selected drive mode, each luminance ideal value of RGB that is white is obtained for the input gradation value (S12).
- each driving mode is represented by a second gradation value conversion table indicating the relationship between the gradation value and the luminance measurement value. Therefore, based on the second gradation value conversion table corresponding to the selected drive mode, a set gradation value for obtaining each RGB ideal luminance value is obtained (S13).
- the set gradation values for each of the RGB colors that are white are obtained so as to keep the color temperature constant for the input gradation value.
- the plasma display device 30a detects the average luminance of the video signal by the average luminance detecting means 14 before input to the color temperature correction device 30a, and based on the average luminance.
- the drive mode selection unit 16 selects the drive mode, and the color temperature correction device 10a receives the input of the drive mode selected by the drive mode selection unit 16.
- the input gradation value force can also be converted into the set gradation value based on the gradation value conversion table corresponding to the selected drive mode, so that when various drive modes are selected. Even so, the color temperature can be kept constant.
- the color temperature correction device 40 according to the third embodiment of the present invention has a selected drive mode that is less than the input tone value of the video signal. The difference is that the input light emission number obtained by multiplying the input drive value by the drive multiple of the signal is converted to the set light emission pulse number so as to keep the color temperature constant. As shown in FIG. 10, this color temperature correction device 40 multiplies the input gradation value of the video signal by the drive multiple of the selected drive mode and outputs the number of input light emission pulses, and the input light emission.
- a storage unit 34 for recording a light emission pulse number conversion table 36 showing the relationship with the number of light emission pulses, and a divider 39 for dividing the set light emission pulse number by the drive multiple and outputting a set gradation value are provided.
- the input light emission pulse number which is obtained by multiplying the input gradation value by the drive multiple, not the input gradation value itself.
- conversion is made to the number of input light emission pulses and the set number of light emission pulses so as to keep the color temperature constant. Therefore, color temperature correction can be performed without being affected by the difference in drive mode. Therefore, it is possible to perform color temperature correction according to all drive patterns without increasing the storage capacity in the storage means 34 without requiring a conversion table for each drive mode.
- the color temperature correction device 40 is characterized in that color temperature correction is performed for the number of light emission pulses instead of the gradation value. The effect of correcting the color temperature for the number of light emission pulses will be described below with reference to FIGS. FIG.
- FIG. 11 to FIG. 16 are diagrams showing the relationship between the number of light emission pulses and the measured luminance value in each case of the drive mode 1 ⁇ to the drive mode 6 ⁇ .
- the number of light emission pulses indicates the number of light emission pulses indicating how many light emission noises represent the gradation value of the video signal, and the drive value of the drive mode is added to the gradation value. Calculated by multiplication. As shown in FIGS. 11 to 16, it can be seen that the number of light emission pulses increases as the drive multiple increases, and the luminance measurement value increases accordingly.
- FIG. 17 shows the relationship between the number of light emission pulses and the measured luminance value for all the drive modes from drive mode 1 to drive mode 6 times. As shown in Fig.
- the color temperature correction method performed by the color temperature correction device 40 will be described with reference to FIGS. 18 and 19 and the flowchart of FIG.
- the multiplier 38 multiplies the input gradation value by the drive multiple of the selected drive mode, and outputs the number of input light emission pulses (S22).
- the ideal luminance values for each of the white RGB colors are set.
- the relationship of the ideal luminance value to the input gradation value is represented in FIG. 18 as the first light emission pulse number conversion table (FIG. 18: —dot chain line). Therefore, based on the first light emission pulse number conversion table, the RGB ideal luminance values for white color are obtained for the input light emission pulse number (S23).
- the ideal luminance value of red (R) is 180 for the number of input light emission pulses 1370 (FIG. 18: procedure (a)). The same is true for green (G) and blue (B).
- the relationship between the number of light emission pulses and the actually measured luminance value is represented by the second light emission pulse number conversion table ( Figure 18: solid line). Therefore, based on the second light emission pulse number conversion table, the set number of light emission pulses for obtaining each luminance ideal value of RGB is obtained (S24). For example, in the case of FIG. 18, the set number of emission pulses 1275 is obtained as the number of red (R) emission pulses that output the ideal luminance value 180 (FIG. 18: procedure (b)). In addition, for green (G) and blue (B), the power for obtaining the set number of light emission pulses is omitted in detail.
- Divider 39 divides the set number of light emission pulses by the above drive multiple and outputs the set gradation value (S25).
- the number of input light emission pulses of the video signal can be converted to the set number of light emission pulses for each of the white RGB colors so as to keep the color temperature constant.
- the input light emission pulse number 1370 is converted into the set light emission pulse number 1275.
- the relationship between the set gradation values of each of the white and white RGB colors that keep the color temperature constant is as shown in FIG. It is expressed as
- This light emission pulse number conversion table can be expressed as a combination of the first light emission pulse number conversion table and the second light emission pulse number conversion table.
- a plasma display panel device 50 according to Embodiment 3 of the present invention will be described with reference to the block diagram of FIG.
- the plasma display panel device 50 according to the third embodiment receives an output after correcting the luminance difference according to the drive mode by the multiplier 18.
- the color temperature correction device 40 is connected to the above.
- the color temperature correcting device 40 is different in that the color temperature is corrected not by the gradation value but by the number of light emission pulses. Therefore, color temperature correction can be performed so that the color temperature is kept constant regardless of the selected drive mode. Further, since it is not necessary to prepare a conversion table for each drive mode, color temperature correction corresponding to all drive patterns can be performed without increasing the storage capacity in the storage means 34 in the color temperature correction device 40.
- the color temperature correction device and the display device according to the present invention can be used particularly for a plasma display device.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2008516698A JPWO2007136060A1 (ja) | 2006-05-24 | 2007-05-22 | 色温度補正装置及びディスプレイ装置 |
CN2007800170725A CN101443834B (zh) | 2006-05-24 | 2007-05-22 | 色温度补正装置及显示装置 |
EP07743871A EP2031573A1 (en) | 2006-05-24 | 2007-05-22 | Color temperature correction device and display device |
US12/301,677 US8144172B2 (en) | 2006-05-24 | 2007-05-22 | Color temperature correction device and display device |
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JP2006-143473 | 2006-05-24 | ||
JP2006143473 | 2006-05-24 |
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PCT/JP2007/060437 WO2007136060A1 (ja) | 2006-05-24 | 2007-05-22 | 色温度補正装置及びディスプレイ装置 |
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US (1) | US8144172B2 (ja) |
EP (1) | EP2031573A1 (ja) |
JP (1) | JPWO2007136060A1 (ja) |
KR (1) | KR20090010032A (ja) |
CN (1) | CN101443834B (ja) |
WO (1) | WO2007136060A1 (ja) |
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CN105246192A (zh) * | 2015-09-18 | 2016-01-13 | 佛山市固芯照明有限公司 | 一种led灯智能导向控制方法、系统及主控led灯 |
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KR101489741B1 (ko) * | 2013-12-31 | 2015-02-04 | 한국기술교육대학교 산학협력단 | Led 색온도 제어 방법 및 시스템 |
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KR20210036042A (ko) * | 2019-09-25 | 2021-04-02 | 삼성전자주식회사 | 디스플레이 장치 및 그 제어 방법 |
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- 2007-05-22 JP JP2008516698A patent/JPWO2007136060A1/ja not_active Withdrawn
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Also Published As
Publication number | Publication date |
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KR20090010032A (ko) | 2009-01-28 |
JPWO2007136060A1 (ja) | 2009-10-01 |
CN101443834B (zh) | 2012-06-20 |
EP2031573A1 (en) | 2009-03-04 |
US8144172B2 (en) | 2012-03-27 |
US20090267967A1 (en) | 2009-10-29 |
CN101443834A (zh) | 2009-05-27 |
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