WO2012073344A1 - Display device, image-quality adjustment method, and program - Google Patents

Display device, image-quality adjustment method, and program Download PDF

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Publication number
WO2012073344A1
WO2012073344A1 PCT/JP2010/071408 JP2010071408W WO2012073344A1 WO 2012073344 A1 WO2012073344 A1 WO 2012073344A1 JP 2010071408 W JP2010071408 W JP 2010071408W WO 2012073344 A1 WO2012073344 A1 WO 2012073344A1
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Prior art keywords
unit
display
information
correction information
correction
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PCT/JP2010/071408
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French (fr)
Japanese (ja)
Inventor
隆一 藤村
勝之 松井
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Ｎｅｃディスプレイソリューションズ株式会社
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Priority to PCT/JP2010/071408 priority Critical patent/WO2012073344A1/en
Priority to JP2012546620A priority patent/JP5743233B2/en
Publication of WO2012073344A1 publication Critical patent/WO2012073344A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/506—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors measuring the colour produced by screens, monitors, displays or CRTs
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
    • G01J1/28—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source
    • G01J1/30—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source using electric radiation detectors
    • G01J1/32—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source using electric radiation detectors adapted for automatic variation of the measured or reference value
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • 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
    • G09G2320/0693—Calibration of display systems
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen

Definitions

  • the present invention relates to a display device that calibrates an optical sensor provided outside, an image quality adjustment method, and a program.
  • the display device When the display device is used in an industrial field where strict color reproduction is required, the display device is periodically used for calibration of display characteristics. For the user, periodically calibrating the display characteristics of the display device is troublesome in managing the display device. Even if the display characteristics are calibrated regularly, it is difficult to confirm that the display characteristics with the calibration accuracy expected when actually using the display device are maintained. In addition, in order for the user to easily confirm the display characteristics of the display device, the display characteristics may be measured using an optical sensor that can be used simply (see, for example, Patent Document 1).
  • the display characteristics indicated by the measured results depend on the detection characteristics of the measurement system.
  • the colorimetric error of an optical sensor that is simply used shows a relatively large value as compared with the colorimetric error of an optical sensor used as a measuring instrument at the time of calibration or the like.
  • the detection accuracy of the optical sensor is low and the color measurement error increases, so that there is a problem that a correct display color cannot be obtained.
  • the problem to be solved is that a measurement error included in a colorimetric value obtained by measurement using an optical sensor with low detection accuracy is large, and the display device cannot be calibrated.
  • the present invention is a display device that includes a display unit that displays video information corresponding to a video signal, and obtains detection information from a photometry unit that has detected display characteristics of the display unit, and the display unit based on correction information
  • a reference value determined as the display characteristic to be detected by the photometry unit when displaying a reference image on the display unit, and a signal conversion unit that converts the video signal according to a change in optical characteristics in Based on first detection information indicating the display characteristics detected by the photometry unit, and second detection information indicating the display characteristics detected by the photometry unit after the first detection information is detected,
  • a correction information generation unit that generates the correction information that corrects a change in optical characteristics, and a control unit that controls to correct the change in optical characteristics according to the correction information. It is a display device that.
  • the display device of the present invention has an advantage that measurement errors included in colorimetric values obtained by measurement using an optical sensor with low detection accuracy can be reduced, and the display device can be calibrated with desired accuracy. is there.
  • FIG. 1 is a block diagram showing a configuration of a display device according to this embodiment.
  • the display device 1 shown in FIG. 1 is supplied with a video signal from the outside, and displays a video based on the video signal. Further, the display device 1 is connected to a sensor unit 2 that measures an image displayed on the display unit 40, and obtains detection information indicating the display characteristics of the display device 1 detected by the sensor unit 2.
  • the sensor unit 2 detects the display state of the image displayed on the display unit 40. When the detection by the sensor 2 is performed, a reference image (test pattern) corresponding to the measurement purpose is displayed on the display unit 40, and the line sub 2 detects the displayed reference image.
  • the display characteristics of the display device 1 depend on the optical characteristics of the display section 40 and the signal conversion characteristics for adjusting (converting) the signal supplied to the display section 40 according to the optical characteristics of the display section 40.
  • the measured display characteristics of the display device 1 depend on the detection characteristics of the measurement system including the sensor unit 2.
  • the display device 1 includes a detection information acquisition unit 10, a correction information generation unit 20, a lookup table unit 30, a display unit 40, an operation unit 80, and a control unit 90.
  • the detection information acquisition unit 10 obtains detection information from the sensor unit 2.
  • the correction information generation unit 20 obtains detection information detected by the sensor unit 2 from the detection information acquisition unit 10 and generates correction information for correcting a change in the optical characteristics of the display unit 40.
  • the correction information generation unit 20 includes a reference information storage unit 21, a first detection information storage unit 22, a first correction information storage unit 23, a current characteristic storage unit 24, a first correction information generation unit 25, and a second correction information generation. Part 26 is provided.
  • the reference information storage unit 21 stores a reference value determined as a display characteristic to be detected by the sensor unit 2 (photometry unit) when displaying a reference image on the display unit 40.
  • the first detection information storage unit 22 stores first detection information indicating display characteristics detected by the sensor unit 2.
  • the first detection information indicates display characteristics detected when the sensor unit 2 is first connected to the display device 1.
  • the first correction information storage unit 23 stores first correction information generated based on the reference value and the first detection information.
  • the first correction information is information generated based on the difference between the reference value and the first detection information.
  • the current characteristic storage unit 24 stores second detection information indicating display characteristics detected by the sensor unit 2 after the first detection information is detected.
  • the second detection information indicates display characteristics detected as the current status of the display device 1.
  • the first correction information generation unit 25 obtains the reference value stored in the reference information storage unit 21 and the first detection information stored in the first detection information storage unit 22.
  • the first correction information generation unit 25 generates first correction information based on the difference between the reference value and the first detection information.
  • the first correction information generation unit 25 stores the generated first correction information in the first correction information storage unit 23 in accordance with the control command supplied from the control unit 90.
  • the second correction information generation unit 26 obtains first correction information stored in the first correction information storage unit 23 and second detection information stored in the current characteristic storage unit 24.
  • the second correction information generation unit 26 generates second correction information based on the difference between the first correction information and the second detection information in accordance with a control command supplied from the control unit 90.
  • the correction information generation unit 20 When the correction information generation unit 20 displays a reference image on the display unit 40 under the control of the control unit 90, the correction information generation unit 20 is a reference value determined as a display characteristic to be detected by the sensor unit 2 (photometry unit), a sensor Based on the first detection information indicating the display characteristics detected by the unit 2 and the second detection information indicating the display characteristics detected by the sensor unit 2 after the first detection information is detected, the change of the optical characteristics is performed. Correction information to be corrected is generated.
  • the lookup table unit 30 (signal conversion unit) obtains a video signal supplied to the display device 1 and converts the video signal so as to correct the change in the optical characteristics of the display unit 40 based on the correction information. .
  • the look-up table unit 30 supplies the converted video signal to the display unit 40.
  • the lookup table unit 30 includes a conversion table (lookup table) for performing the above-described conversion, and the conversion table is provided according to a plurality of hue signals.
  • the display unit 40 displays a video corresponding to the video signal supplied to the display device 1.
  • the display unit 40 is supplied with the video signal converted by the lookup table unit 30.
  • the operation unit 80 detects an operation by the user and supplies the detected operation information to the control unit 90.
  • the operation information includes image quality characteristic correction instruction information for instructing execution of image quality correction processing for correcting the image quality of the display unit 40, target image quality selection information for selecting target image quality characteristics, and the like.
  • the control unit 90 controls signal conversion for correcting changes in the optical characteristics of the display unit 40 in accordance with the correction information.
  • the control unit 90 compares the reference value with the first detection information to determine the characteristics of the sensor unit 2. Based on the determination result, the control unit 90 determines whether to perform correction based on the second correction information in the lookup table unit 30. When the difference between the reference value and the first detection information is greater than a predetermined value, the control unit 90 performs correction based on the second correction information in the lookup table unit 30. That is, the control unit 90 sets the value in the conversion table of the lookup table unit 30 to a correction value corrected by the second correction information.
  • the control unit 90 sets the value of the conversion table of the lookup table unit 30 to a standard value.
  • control unit 90 determines the necessity of creating correction information when the sensor unit 2 is connected. Specifically, the determination of the necessity of creating the correction information is made when the correction information (first correction information) of the sensor unit 2 is not stored in the first correction information storage unit 23 when there is a user's creation instruction. In this case, it is performed when a condition such as when the sensor unit 2 is first connected is established. For example, when the sensor unit 2 is first connected to the detection information acquisition unit 10, the control unit 90 uses the display characteristics detected by the sensor unit 2 as the first detection information in the correction information generation unit 20. The data is stored in the storage unit 22.
  • FIG. 2 is a flowchart illustrating a procedure of processing for correcting display characteristics in the display device 1.
  • the initial conditions are arranged in order to carry out this procedure.
  • a display characteristic value (A) of the display device 1 is obtained by a reference color sensor, and this is used as an initial characteristic (reference value).
  • This initial characteristic may be a representative value or specification value determined separately.
  • a reference value corresponding to the initial characteristic determined as described above is stored in the reference information storage unit 21 in the correction information generation unit 20.
  • the control unit 90 causes the detection information acquisition unit 10 to detect that the sensor unit 2 has been connected (step S10).
  • the control unit 90 determines whether or not the detection information acquisition unit 10 detects that the sensor unit 2 is connected until the connection of the sensor unit 2 is detected. Repeatedly (step S15).
  • the control unit 90 causes the detection information acquisition unit 10 to acquire the display characteristic value (B) of the display unit 40 detected by the sensor unit 2. Then, it is stored in the first detection information storage unit 22 as the first detection information (step S20).
  • the display characteristic value (B) should match the display characteristic value (A) stored in the reference information storage unit 21. However, a difference may occur between the display characteristic value (A) (reference value) and the display characteristic value (B) (first detection information) due to individual differences of the sensor unit 2 and the like. It is necessary to correct the result obtained.
  • the control unit 90 determines whether correction is necessary based on the result detected by the sensor unit 2 (step S25). When the difference between the reference value and the first detection information does not exceed a predetermined value, the control unit 90 determines that the correction of the sensor unit 2 is not necessary (Step S25: No), and the lookup table.
  • the unit 30 is configured not to perform correction based on the second correction information. That is, the control unit 90 sets the value of the conversion table of the lookup table unit 30 to the standard value, and finishes the correction process.
  • the control unit 90 determines that correction of the sensor unit 2 is necessary (step S25: required), and first correction information
  • the generation unit 25 generates first correction information.
  • the first correction information generation unit 25 generates first correction information for correcting the display characteristic value (B) to match the display characteristic value (A) stored in the monitor, and the first correction information storage unit 23. Is written and stored (step S30). By the correction based on the first correction information, the value detected by the sensor unit 2 is set to an accurate value by the correction.
  • the display characteristics of the display unit 40 in the display device 1 may change when an appropriate time elapses.
  • the processing described below is performed after a predetermined time has elapsed from the procedure shown in steps S10 to S30.
  • the control unit 90 uses the sensor unit 2 to measure again the display characteristic value (C) indicating the current display characteristic of the display unit 40. By this measurement, the display characteristic value (C) of the display unit 40 detected by the sensor unit 2 is acquired and stored in the second detection information storage unit 24 as second detection information indicating the current characteristic (step S40). .
  • the control unit 90 uses the second correction information generation unit 26 based on the difference between the first correction information stored in the first correction information storage unit 23 and the second detection information stored in the current characteristic storage unit 24. 2 Correction information is generated. Based on the second correction information, the first correction value is applied to the display characteristic value (C) to obtain the display characteristic value (C ′) (step S45).
  • the control unit 90 corrects and updates the information in the conversion table provided in the lookup table unit 30 according to the second correction information (step S60). Thereby, the display characteristic of the display unit 40 can be calibrated using the display characteristic value (C ′).
  • control unit 90 determines whether or not it is necessary to change the display characteristics of the display unit 40, that is, the information of the conversion table, again in accordance with the information input from the input unit 80. As a result of the determination, if a change is necessary, the processing from step S40 is performed (step S65).
  • the display device 1 can correct the display characteristics, reduce the measurement error included in the colorimetric value obtained by the measurement using the optical sensor with low detection accuracy, and display The device can be calibrated with the desired accuracy.
  • the display measurement value (A) determined as the “reference value” indicates the target display characteristic and does not include a detection error due to the measurement system. That is, the display measurement value (A) is a value derived from a desired display characteristic (M 0 ).
  • the display measurement value (B) is an initial display characteristic measured including the detection error (e) by the measurement system.
  • B A + e can be shown.
  • the display measurement value (C) is measured including a detection error (e) by the measurement system.
  • the display measurement value (C ′) is obtained by correcting the display measurement value (C) with the first correction information (COM 1 ). That is, the display measurement value (C ′) can be represented by the display measurement value (A) and the change ⁇ of the optical characteristic of the display unit 40 as in the following equation.
  • the change ⁇ of the optical characteristic of the display unit 40 can be accurately obtained.
  • FIG. 3 is a block diagram of the display device in the present embodiment.
  • the display device 1 includes a detection information acquisition unit 10, a correction information generation unit 20B, a lookup table unit 30, a display unit 40, a target image quality setting unit 50, an operation unit 80, and a control unit 90B.
  • the correction information generation unit 20B obtains detection information detected by the sensor unit 2 from the detection information acquisition unit 10, obtains target image quality information from the target image quality setting unit 50, and corrects a change in optical characteristics of the display unit 40. Generate correction information.
  • the correction information generation unit 20B includes a reference information storage unit 21, a first detection information storage unit 22, a first correction information storage unit 23, a current characteristic storage unit 24, a first correction information generation unit 25, and a second correction information generation unit 26. , And a third correction information generation unit 27.
  • the third correction information generation unit 27 generates third correction information based on the second correction information generated by the second correction information generation unit 26 and the target image quality information.
  • the target image quality characteristic generation unit 50 generates target image quality information that makes the display characteristic of the display device 1 a desired characteristic in response to a control command from the control unit 90B.
  • the target image quality characteristic generation unit 50 includes a target image quality characteristic storage unit 51 and a target image quality characteristic acquisition unit 52.
  • the target image quality characteristic storage unit 51 stores a plurality of profiling data (51a to 51c, hereinafter referred to as “51a etc.” when collectively shown).
  • the profiling data 51a or the like is information for setting display characteristics of the display device 1 so as to be provided according to the application to which the display device 1 is applied, for example.
  • the target image quality characteristic acquisition unit 52 generates target image quality information that makes the display characteristic of the display device 1 a desired characteristic based on the identification information indicating the designated display characteristic in accordance with a control command from the control unit 90B.
  • the look-up table unit 30 adjusts the optical characteristics based on the third correction information generated according to the set target image quality information.
  • control unit 90B controls the target image quality characteristic generation unit 50 so as to obtain a desired target image quality characteristic according to the information detected by the operation unit 80. Prior to the display characteristic measurement, the control unit 90B determines the target image quality characteristic, and causes the target image quality characteristic acquisition unit 52 to generate target image quality information from the profiling data 51a and the like according to the result.
  • the third correction information generation unit 27 can generate third correction information based on the target image quality information generated by the target image quality characteristic generation unit 50. Since the third correction information is generated based on the target image quality information, the information of the conversion table stored in the lookup table unit 30 can be generated according to the desired target image quality.
  • the target image quality information is set to the same value when measuring the initial display characteristics and when measuring the current display characteristics.
  • the first correction information generation unit 25 and the second correction information generation unit 26 generate two correction information at different timings. It can be generated without including the component of the target image quality information.
  • the present invention is not limited to the above embodiments, and can be modified without departing from the spirit of the present invention.
  • the initial characteristics shown in the present embodiment include white point luminance chromaticity, gamma characteristics, and color gamut.
  • the initial characteristics can be obtained by measuring the display device 1 with a sensor serving as a reference during factory adjustment.
  • the display device 1 shown in the present embodiment includes the first detection information storage unit 22 and the current characteristic storage unit 24, thereby generating correction information based on the detection results of a plurality of measurement items. be able to.
  • the above storage unit may be deleted.
  • the display device 1 shown in the present embodiment is supplied with a video signal from the outside, but may be generated by a video signal generation unit provided in the same casing as the display unit 40. Good.
  • An example of such a display device 1 is a personal computer.
  • amendment information based on two information can utilize arbitrary existing techniques.
  • sensor values such as XYZ values and RGB values can be handled as vectors in a three-dimensional color space.
  • a general color space enlargement / reduction and rotation effect can be obtained.
  • Sensor error can also be effectively corrected by this orthogonal transformation (vector operation).
  • FIG. 4 shows the correction effect when this vector operation is applied to this embodiment.
  • the three-dimensional color space (xyz) is shown projected onto the xy plane.
  • the hue space R 1 G 1 B 1 detected as the first detection information (XsYsZs) is corrected, and the hue space R 2 G 2 B indicated as the second correction information (XYZ). Get 2 .
  • the white point W 1 in the hue space R 1 G 1 B 1 detected by the sensor unit 2 can also be moved to the white point W 2 by this correction.
  • FIG. 5 shows a specific correction formula for the vector calculation. By this calculation, the vector [XsYsZs] T indicating the first detection information is converted into the vector [X Y Z] T indicating the second correction information (the subscript “T” indicates a transposed vector).
  • the display device 1 described above has a computer system inside.
  • the process of correcting the display characteristics in the display device 1 described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing this program.
  • the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.
  • the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

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  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Processing Of Color Television Signals (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

This display device (1) is provided with a display unit (40) that displays video information in accordance with a video signal. Said display device obtains detection information from a light-measurement unit (2) that detects display characteristics of the aforementioned display unit (40). The display device (1) is also provided with: a signal-conversion unit (30) that converts the aforementioned video signal in accordance with changes in the optical characteristics of the display unit (40) on the basis of correction information; a correction-information generation unit (20); and a control unit (90) that controls the display device so as to correct for the changes in the optical characteristics in accordance with the correction information. When an image serving as a reference is displayed on the display unit (40), the correction-information generation unit generates the aforementioned correction information, which corrects for changes in the optical characteristics, on the basis of the following: prescribed reference values that indicate the display characteristics that should be detected by the light-measurement unit (2); first detection information indicating display characteristics detected by the light-measurement unit (2); and second detection information indicating display characteristics detected by the light-measurement unit (2) after the detection of the first detection information.

Description

表示装置、画質調整方法及びプログラムDisplay device, image quality adjustment method, and program
　本発明は、外部に設けられた光学センサの校正する表示装置、画質調整方法及びプログラムに関する。 The present invention relates to a display device that calibrates an optical sensor provided outside, an image quality adjustment method, and a program.
　表示装置は、厳密な色再現が求められる産業分野において利用される場合、定期的な表示特性の校正が行なわれて利用されている。ユーザーにとって、定期的に表示装置の表示特性の校正を行うことは、表示装置を管理する上で煩雑なことである。また、定期的に表示特性の校正を行っていたとしても、実際に表示装置を利用する際に期待する校正精度の表示特性が維持されていることを確認することは困難であった。
　また、ユーザーが簡単に表示装置の表示特性を確認するために、簡易的に用いることができる光学センサを用いて表示特性を測定する場合がある（例えば、特許文献１参照）。 When the display device is used in an industrial field where strict color reproduction is required, the display device is periodically used for calibration of display characteristics. For the user, periodically calibrating the display characteristics of the display device is troublesome in managing the display device. Even if the display characteristics are calibrated regularly, it is difficult to confirm that the display characteristics with the calibration accuracy expected when actually using the display device are maintained.
In addition, in order for the user to easily confirm the display characteristics of the display device, the display characteristics may be measured using an optical sensor that can be used simply (see, for example, Patent Document 1).
特開２００５－２０８５４８号公報JP 2005-208548 A
　ところで、表示装置の表示特性を測定する場合、測定された結果によって示される表示特性は、測定系の検出特性に依存するものとなる。
　しかしながら、ユーザーが簡易的に用いることができる光学センサには検出特性の個体差があり、個体ごとに異なる測定誤差（測色誤差）が生じる。簡易的に用いられる光学センサの測色誤差は、校正時などに測定器として用いられる光学センサの測色誤差と比較すると相対的に大きな値を示す。簡易的に用いられる光学センサを用いて表示装置の表示特性を校正すると、光学センサの検出精度が低くく、測色誤差が大きくなることから、正しい表示色が得られないという課題がある。
　このように、解決する課題は、検出精度の低い光学センサを用いた測定により得られる測色値に含まれる測定誤差が大きく、表示装置を校正することができない点である。 By the way, when measuring the display characteristics of the display device, the display characteristics indicated by the measured results depend on the detection characteristics of the measurement system.
However, there are individual differences in detection characteristics among optical sensors that can be easily used by the user, and measurement errors (colorimetric errors) that differ from one individual to another occur. The colorimetric error of an optical sensor that is simply used shows a relatively large value as compared with the colorimetric error of an optical sensor used as a measuring instrument at the time of calibration or the like. When the display characteristics of the display device are calibrated using an optical sensor that is simply used, the detection accuracy of the optical sensor is low and the color measurement error increases, so that there is a problem that a correct display color cannot be obtained.
Thus, the problem to be solved is that a measurement error included in a colorimetric value obtained by measurement using an optical sensor with low detection accuracy is large, and the display device cannot be calibrated.
　本発明は、映像信号に応じた映像情報を表示する表示部を備え、前記表示部の表示特性を検出した測光部からの検出情報を得る表示装置であって、補正情報に基づいて前記表示部における光学特性の変化に応じて前記映像信号を変換する信号変換部と、基準とする画像を前記表示部に表示させる場合に、前記測光部によって検出されるべき前記表示特性として定められる基準値、前記測光部によって検出された前記表示特性を示す第１検出情報、及び、前記第１検出情報が検出された後に前記測光部によって検出された前記表示特性を示す第２検出情報に基づいて、前記光学特性の変化を補正する前記補正情報を生成する補正情報生成部と、前記補正情報に応じて前記光学特性の変化を補正するように制御する制御部とを備えることを特徴とする表示装置である。 The present invention is a display device that includes a display unit that displays video information corresponding to a video signal, and obtains detection information from a photometry unit that has detected display characteristics of the display unit, and the display unit based on correction information A reference value determined as the display characteristic to be detected by the photometry unit when displaying a reference image on the display unit, and a signal conversion unit that converts the video signal according to a change in optical characteristics in Based on first detection information indicating the display characteristics detected by the photometry unit, and second detection information indicating the display characteristics detected by the photometry unit after the first detection information is detected, A correction information generation unit that generates the correction information that corrects a change in optical characteristics, and a control unit that controls to correct the change in optical characteristics according to the correction information. It is a display device that.
　本発明の表示装置は、検出精度の低い光学センサを用いた測定により得られる測色値に含まれる測定誤差を小さくすることができ、表示装置を所望の精度で校正することができるという利点がある。 The display device of the present invention has an advantage that measurement errors included in colorimetric values obtained by measurement using an optical sensor with low detection accuracy can be reduced, and the display device can be calibrated with desired accuracy. is there.
本発明の第１実施形態における表示装置を示すブロック図である。It is a block diagram which shows the display apparatus in 1st Embodiment of this invention. 本実施形態における表示装置における表示特性を補正する処理の手順を示すフローチャートである。It is a flowchart which shows the procedure of the process which correct | amends the display characteristic in the display apparatus in this embodiment. 第２実施形態における表示装置を示すブロック図である。It is a block diagram which shows the display apparatus in 2nd Embodiment. 三次元色空間における色相空間の補正処理を示す図である。It is a figure which shows the correction process of the hue space in a three-dimensional color space. 三次元色空間における色相空間の補正処理の演算を示す図である。It is a figure which shows the calculation of the correction process of the hue space in a three-dimensional color space.
（第１実施形態）
　図を参照し、本発明の実施形態について説明する。
　図１は、本実施形態における表示装置構成を示すブロック図である。
　この図１に示される表示装置１は、外部から映像信号が供給されており、その映像信号に基づいた映像を表示する。また、表示装置１には、表示部４０に表示された映像を測定するセンサ部２が接続され、センサ部２によって検出された表示装置１の表示特性を示す検出情報を得る。
センサ部２は、表示部４０に表示された画像の表示状態を検出する。センサ２による検出を行う際には、表示部４０に測定目的に応じた基準画像（テストパターン）が表示されており、線サブ２は、その表示された基準画像を検出する。
表示装置１の表示特性は、表示部４０の光学特性と、表示部４０の光学特性に合わせて、表示部４０に供給される信号を調整（変換）する信号変換特性とに依存する。また、測定された表示装置１の表示特性は、センサ部２を含む測定系の検出特性に依存するものとなる。 (First embodiment)
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a display device according to this embodiment.
The display device 1 shown in FIG. 1 is supplied with a video signal from the outside, and displays a video based on the video signal. Further, the display device 1 is connected to a sensor unit 2 that measures an image displayed on the display unit 40, and obtains detection information indicating the display characteristics of the display device 1 detected by the sensor unit 2.
The sensor unit 2 detects the display state of the image displayed on the display unit 40. When the detection by the sensor 2 is performed, a reference image (test pattern) corresponding to the measurement purpose is displayed on the display unit 40, and the line sub 2 detects the displayed reference image.
The display characteristics of the display device 1 depend on the optical characteristics of the display section 40 and the signal conversion characteristics for adjusting (converting) the signal supplied to the display section 40 according to the optical characteristics of the display section 40. The measured display characteristics of the display device 1 depend on the detection characteristics of the measurement system including the sensor unit 2.
　表示装置１は、検出情報取得部１０、補正情報生成部２０、ルックアップテーブル部３０、表示部４０、操作部８０、及び、制御部９０を備える。
　検出情報取得部１０は、センサ部２からの検出情報を得る。
　補正情報生成部２０は、検出情報取得部１０からセンサ部２によって検出された検出情報を得て、表示部４０の光学特性の変化を補正する補正情報を生成する。
　補正情報生成部２０は、基準情報記憶部２１、第１検出情報記憶部２２、第１補正情報記憶部２３、現在特性記憶部２４、第１補正情報生成部２５、及び、第２補正情報生成部２６を備える。 The display device 1 includes a detection information acquisition unit 10, a correction information generation unit 20, a lookup table unit 30, a display unit 40, an operation unit 80, and a control unit 90.
The detection information acquisition unit 10 obtains detection information from the sensor unit 2.
The correction information generation unit 20 obtains detection information detected by the sensor unit 2 from the detection information acquisition unit 10 and generates correction information for correcting a change in the optical characteristics of the display unit 40.
The correction information generation unit 20 includes a reference information storage unit 21, a first detection information storage unit 22, a first correction information storage unit 23, a current characteristic storage unit 24, a first correction information generation unit 25, and a second correction information generation. Part 26 is provided.
　基準情報記憶部２１は、基準とする画像を表示部４０に表示させる場合に、センサ部２（測光部）によって検出されるべき表示特性として定められる基準値を記憶する。
　第１検出情報記憶部２２は、センサ部２によって検出された表示特性を示す第１検出情報を記憶する。第１検出情報は、表示装置１にセンサ部２が最初に接続された場合に検出した表示特性を示す。
　第１補正情報記憶部２３は、基準値と第１検出情報とに基づいて生成された第１補正情報を記憶する。第１補正情報は、基準値と第１検出情報との差に基づいて生成された情報である。
　現在特性記憶部２４は、第１検出情報が検出された後にセンサ部２によって検出された表示特性を示す第２検出情報を記憶する。第２検出情報は、表示装置１の現在の状況として検出した表示特性を示す。 The reference information storage unit 21 stores a reference value determined as a display characteristic to be detected by the sensor unit 2 (photometry unit) when displaying a reference image on the display unit 40.
The first detection information storage unit 22 stores first detection information indicating display characteristics detected by the sensor unit 2. The first detection information indicates display characteristics detected when the sensor unit 2 is first connected to the display device 1.
The first correction information storage unit 23 stores first correction information generated based on the reference value and the first detection information. The first correction information is information generated based on the difference between the reference value and the first detection information.
The current characteristic storage unit 24 stores second detection information indicating display characteristics detected by the sensor unit 2 after the first detection information is detected. The second detection information indicates display characteristics detected as the current status of the display device 1.
　第１補正情報生成部２５は、基準情報記憶部２１に記憶された基準値と、第１検出情報記憶部２２に記憶された第１検出情報を得る。第１補正情報生成部２５は、その基準値と第１検出情報との差に基づいた第１補正情報を生成する。第１補正情報生成部２５は、制御部９０から供給される制御指令に応じて、生成した第１補正情報を第１補正情報記憶部２３に記憶させる。
　第２補正情報生成部２６は、第１補正情報記憶部２３に記憶された第１補正情報と、現在特性記憶部２４に記憶された第２検出情報とを得る。第２補正情報生成部２６は、その第１補正情報と第２検出情報との差に基づいた第２補正情報を、制御部９０から供給される制御指令に応じて生成する。 The first correction information generation unit 25 obtains the reference value stored in the reference information storage unit 21 and the first detection information stored in the first detection information storage unit 22. The first correction information generation unit 25 generates first correction information based on the difference between the reference value and the first detection information. The first correction information generation unit 25 stores the generated first correction information in the first correction information storage unit 23 in accordance with the control command supplied from the control unit 90.
The second correction information generation unit 26 obtains first correction information stored in the first correction information storage unit 23 and second detection information stored in the current characteristic storage unit 24. The second correction information generation unit 26 generates second correction information based on the difference between the first correction information and the second detection information in accordance with a control command supplied from the control unit 90.
　補正情報生成部２０は、制御部９０からの制御により、基準とする画像を表示部４０に表示させる場合に、センサ部２（測光部）によって検出されるべき表示特性として定められる基準値、センサ部２によって検出された表示特性を示す第１検出情報、及び、第１検出情報が検出された後にセンサ部２によって検出された表示特性を示す第２検出情報に基づいて、光学特性の変化を補正する補正情報を生成する。 When the correction information generation unit 20 displays a reference image on the display unit 40 under the control of the control unit 90, the correction information generation unit 20 is a reference value determined as a display characteristic to be detected by the sensor unit 2 (photometry unit), a sensor Based on the first detection information indicating the display characteristics detected by the unit 2 and the second detection information indicating the display characteristics detected by the sensor unit 2 after the first detection information is detected, the change of the optical characteristics is performed. Correction information to be corrected is generated.
　ルックアップテーブル部３０（信号変換部）は、表示装置１に供給される映像信号を得て、補正情報に基づいて表示部４０の光学特性の変化を補正するように、その映像信号を変換する。ルックアップテーブル部３０は、変換した映像信号を表示部４０に供給する。ルックアップテーブル部３０は、上記の変換を行うための変換テーブル（ルックアップテーブル）を備えており、その変換テーブルは、複数の色相信号に応じて設けられている。 The lookup table unit 30 (signal conversion unit) obtains a video signal supplied to the display device 1 and converts the video signal so as to correct the change in the optical characteristics of the display unit 40 based on the correction information. . The look-up table unit 30 supplies the converted video signal to the display unit 40. The lookup table unit 30 includes a conversion table (lookup table) for performing the above-described conversion, and the conversion table is provided according to a plurality of hue signals.
　表示部４０は、表示装置１に供給された映像信号に応じた映像を表示する。表示部４０は、ルックアップテーブル部３０によって変換された映像信号が供給される。
　操作部８０は、ユーザーによる操作を検出し、制御部９０に検出した操作情報を供給する。操作情報には、表示部４０の画質補正を行う画質補正処理の実施を指示する画質特性補正指示情報、目標画質特性を選択する目標画質選択情報などが含まれる。 The display unit 40 displays a video corresponding to the video signal supplied to the display device 1. The display unit 40 is supplied with the video signal converted by the lookup table unit 30.
The operation unit 80 detects an operation by the user and supplies the detected operation information to the control unit 90. The operation information includes image quality characteristic correction instruction information for instructing execution of image quality correction processing for correcting the image quality of the display unit 40, target image quality selection information for selecting target image quality characteristics, and the like.
　制御部９０は、補正情報に応じて表示部４０の光学特性の変化を補正する信号変換を制御する。
　制御部９０は、基準値と第１検出情報を比較して、センサ部２の特性を判定する。制御部９０は、その判定結果により、ルックアップテーブル部３０において第２補正情報に基づいた補正を行うか否かを判定する。
　制御部９０は、基準値と第１検出情報との差が、あらかじめ定められる所定の値より大きい場合は、ルックアップテーブル部３０において第２補正情報に基づいた補正を行うようにする。つまり、制御部９０は、ルックアップテーブル部３０の変換テーブルの値を、第２補正情報により補正した補正値にする。
　基準値と第１検出情報との差が、あらかじめ定められる所定の値に満たない場合は、ルックアップテーブル部３０において第２補正情報に基づいた補正を行わないようにする。つまり、制御部９０は、ルックアップテーブル部３０の変換テーブルの値を標準値にする。 The control unit 90 controls signal conversion for correcting changes in the optical characteristics of the display unit 40 in accordance with the correction information.
The control unit 90 compares the reference value with the first detection information to determine the characteristics of the sensor unit 2. Based on the determination result, the control unit 90 determines whether to perform correction based on the second correction information in the lookup table unit 30.
When the difference between the reference value and the first detection information is greater than a predetermined value, the control unit 90 performs correction based on the second correction information in the lookup table unit 30. That is, the control unit 90 sets the value in the conversion table of the lookup table unit 30 to a correction value corrected by the second correction information.
When the difference between the reference value and the first detection information is less than a predetermined value, the correction based on the second correction information is not performed in the lookup table unit 30. That is, the control unit 90 sets the value of the conversion table of the lookup table unit 30 to a standard value.
　また、制御部９０は、センサ部２が接続された際に、補正情報を作成する必要性を判定する。補正情報を作成する必要性の判定は、具体的には、ユーザーの作成指示があった場合、センサ部２の補正情報（第１補正情報）が第１補正情報記憶部２３に記憶されていない場合、最初にセンサ部２が接続された場合、などの条件成立時に行われる。
　制御部９０は、例えば、検出情報取得部１０にセンサ部２が最初に接続された場合、センサ部２によって検出された表示特性を、補正情報生成部２０における第１検出情報として第１検出情報記憶部２２に記憶させる。 Further, the control unit 90 determines the necessity of creating correction information when the sensor unit 2 is connected. Specifically, the determination of the necessity of creating the correction information is made when the correction information (first correction information) of the sensor unit 2 is not stored in the first correction information storage unit 23 when there is a user's creation instruction. In this case, it is performed when a condition such as when the sensor unit 2 is first connected is established.
For example, when the sensor unit 2 is first connected to the detection information acquisition unit 10, the control unit 90 uses the display characteristics detected by the sensor unit 2 as the first detection information in the correction information generation unit 20. The data is stored in the storage unit 22.
　以下では、本発明による処理例として、表示装置１における表示特性補正手順について説明する。
　図２は、表示装置１における表示特性を補正する処理の手順を示すフローチャートである。
　まず、この手順を実施するにあたり、初期条件を整理する。
　工場生産時などにおいて、リファレンスとなるカラーセンサにより表示装置１の表示特性値（Ａ）を得て、これを初期特性（基準値）とする。この初期特性は、別に定めた代表値や仕様値にとしてもよい。
　上記のようにして定めた初期特性に応じた基準値を補正情報生成部２０における基準情報記憶部２１に記憶させておく。 Hereinafter, a display characteristic correction procedure in the display device 1 will be described as a processing example according to the present invention.
FIG. 2 is a flowchart illustrating a procedure of processing for correcting display characteristics in the display device 1.
First, the initial conditions are arranged in order to carry out this procedure.
At the time of factory production or the like, a display characteristic value (A) of the display device 1 is obtained by a reference color sensor, and this is used as an initial characteristic (reference value). This initial characteristic may be a representative value or specification value determined separately.
A reference value corresponding to the initial characteristic determined as described above is stored in the reference information storage unit 21 in the correction information generation unit 20.
　続いて、ユーザーの使用環境などにおいて、制御部９０は、検出情報取得部１０にセンサ部２が接続されたことを検出させる（ステップＳ１０）。
　表示装置１の使用を開始した初期段階に、制御部９０は、検出情報取得部１０によってセンサ部２が接続されたことを検出したか否かの判定を、センサ部２の接続を検出するまで繰り返し行う（ステップＳ１５）。
　ステップＳ１５における判定の結果、センサ部２が接続されたと判定した場合、制御部９０は、検出情報取得部１０にセンサ部２によって検出された表示部４０の表示特性値（Ｂ）を取得させて、第１検出情報として第１検出情報記憶部２２に記憶させる（ステップＳ２０）。 Subsequently, in the user's usage environment or the like, the control unit 90 causes the detection information acquisition unit 10 to detect that the sensor unit 2 has been connected (step S10).
At the initial stage when the use of the display device 1 is started, the control unit 90 determines whether or not the detection information acquisition unit 10 detects that the sensor unit 2 is connected until the connection of the sensor unit 2 is detected. Repeatedly (step S15).
As a result of the determination in step S15, when determining that the sensor unit 2 is connected, the control unit 90 causes the detection information acquisition unit 10 to acquire the display characteristic value (B) of the display unit 40 detected by the sensor unit 2. Then, it is stored in the first detection information storage unit 22 as the first detection information (step S20).
　本来、表示特性値（Ｂ）は、基準情報記憶部２１に記憶された表示特性値（Ａ）と一致するべきものである。しかしながら、センサ部２の個体差などにより、表示特性値（Ａ）（基準値）と表示特性値（Ｂ）（第１検出情報）と間に差が発生する場合があり、センサ部２によって検出された結果を補正することが必要になる。 Originally, the display characteristic value (B) should match the display characteristic value (A) stored in the reference information storage unit 21. However, a difference may occur between the display characteristic value (A) (reference value) and the display characteristic value (B) (first detection information) due to individual differences of the sensor unit 2 and the like. It is necessary to correct the result obtained.
　制御部９０は、基準値と第１検出情報との差に基づいて、センサ部２によって検出された結果に基づいて補正することが必要か否かを判定する（ステップＳ２５）。
　制御部９０は、基準値と第１検出情報との差が、あらかじめ定められる所定の値を越えていない場合、センサ部２の補正が必要ないと判定し（ステップＳ２５：否）、ルックアップテーブル部３０において第２補正情報に基づいた補正を行わないようにする。つまり、制御部９０は、ルックアップテーブル部３０の変換テーブルの値を標準値にして、補正処理の手中を終える。 Based on the difference between the reference value and the first detection information, the control unit 90 determines whether correction is necessary based on the result detected by the sensor unit 2 (step S25).
When the difference between the reference value and the first detection information does not exceed a predetermined value, the control unit 90 determines that the correction of the sensor unit 2 is not necessary (Step S25: No), and the lookup table. The unit 30 is configured not to perform correction based on the second correction information. That is, the control unit 90 sets the value of the conversion table of the lookup table unit 30 to the standard value, and finishes the correction process.
　一方、制御部９０は、基準値と第１検出情報との間に所定の値以上の差を検知した場合、センサ部２の補正が必要と判定し（ステップＳ２５：要）、第１補正情報生成部２５に第１の補正情報を生成させる。
　第１補正情報生成部２５は、表示特性値（Ｂ）がモニターに格納された表示特性値（Ａ）に一致するように補正する第１の補正情報を生成し、第１補正情報記憶部２３に書き込んで記憶させる（ステップＳ３０）。この第１の補正情報による補正により、センサ部２によって検出された値が、その補正によって正確な値になるようにする。 On the other hand, when the control unit 90 detects a difference of a predetermined value or more between the reference value and the first detection information, the control unit 90 determines that correction of the sensor unit 2 is necessary (step S25: required), and first correction information The generation unit 25 generates first correction information.
The first correction information generation unit 25 generates first correction information for correcting the display characteristic value (B) to match the display characteristic value (A) stored in the monitor, and the first correction information storage unit 23. Is written and stored (step S30). By the correction based on the first correction information, the value detected by the sensor unit 2 is set to an accurate value by the correction.
　ところで、然るべき時間が経過すると表示装置１における表示部４０の表示特性が変化する場合がある。以降に示す処理は、ステップＳ１０からＳ３０に示した手順から所定の時間が経過した後に行われる。 Incidentally, the display characteristics of the display unit 40 in the display device 1 may change when an appropriate time elapses. The processing described below is performed after a predetermined time has elapsed from the procedure shown in steps S10 to S30.
　制御部９０は、センサ部２により、表示部４０の現在の表示特性を示す表示特性値（Ｃ）を改めて測定する。この測定により、センサ部２によって検出された表示部４０の表示特性値（Ｃ）を取得させて、現在の特性を示す第２検出情報として第２検出情報記憶部２４に記憶させる（ステップＳ４０）。 The control unit 90 uses the sensor unit 2 to measure again the display characteristic value (C) indicating the current display characteristic of the display unit 40. By this measurement, the display characteristic value (C) of the display unit 40 detected by the sensor unit 2 is acquired and stored in the second detection information storage unit 24 as second detection information indicating the current characteristic (step S40). .
　制御部９０は、第２補正情報生成部２６によって、第１補正情報記憶部２３に記憶された第１補正情報と、現在特性記憶部２４に記憶された第２検出情報の差に基づいた第２補正情報を生成させる。第２補正情報により、その表示特性値（Ｃ）に対して、前述の第１の補正値を適用し、表示特性値（Ｃ’）を得る（ステップＳ４５）。 The control unit 90 uses the second correction information generation unit 26 based on the difference between the first correction information stored in the first correction information storage unit 23 and the second detection information stored in the current characteristic storage unit 24. 2 Correction information is generated. Based on the second correction information, the first correction value is applied to the display characteristic value (C) to obtain the display characteristic value (C ′) (step S45).
　制御部９０は、ルックアップテーブル部３０に設けられた変換テーブルの情報を第２補正情報に応じて補正して、更新する（ステップＳ６０）。これにより、表示特性値（Ｃ’）を用いて表示部４０の表示特性を校正することができる。 The control unit 90 corrects and updates the information in the conversion table provided in the lookup table unit 30 according to the second correction information (step S60). Thereby, the display characteristic of the display unit 40 can be calibrated using the display characteristic value (C ′).
　以降、制御部９０は、入力部８０から入力される情報に応じて、再び表示部４０の表示特性、すなわち変換テーブルの情報を変更する必要があるか否かを判定する。その判定の結果、変更が必要な場合は、ステップＳ４０からの処理を行わせる（ステップＳ６５）。 Thereafter, the control unit 90 determines whether or not it is necessary to change the display characteristics of the display unit 40, that is, the information of the conversion table, again in accordance with the information input from the input unit 80. As a result of the determination, if a change is necessary, the processing from step S40 is performed (step S65).
　以上に示した手順により、表示装置１は、表示特性の補正を行うことができ、検出精度の低い光学センサを用いた測定により得られる測色値に含まれる測定誤差小さくすることができ、表示装置を所望の精度で校正することができる。 By the procedure described above, the display device 1 can correct the display characteristics, reduce the measurement error included in the colorimetric value obtained by the measurement using the optical sensor with low detection accuracy, and display The device can be calibrated with the desired accuracy.
　なお、本実施形態に示す補正処理においては、次に示す原理を利用している。
　「基準値」として定めた表示測定値（Ａ）は、目標表示特性を示し、測定系による検出誤差を含まない。つまり、表示測定値（Ａ）は、所望の表示特性（Ｍ０）から導かれた値である。 In the correction processing shown in the present embodiment, the following principle is used.
The display measurement value (A) determined as the “reference value” indicates the target display characteristic and does not include a detection error due to the measurement system. That is, the display measurement value (A) is a value derived from a desired display characteristic (M 0 ).
　表示測定値（Ｂ）は、測定系による検出誤差（ｅ）を含んで測定された初期の表示特性である。表示測定値（Ａ）を基準として示すことにより、Ｂ＝Ａ＋ｅと示すことができる。この時点に生成される第１補正情報（ＣＯＭ１）は、表示測定値（Ａ）と表示測定値（Ｂ）とが等しくなるように定めることにより、上記の検出誤差（ｅ）を打ち消すように定められる。つまり、Ｂ＝Ａと、Ｂ＝Ａ＋ｅ＋ＣＯＭ１、とから、ＣＯＭ１を得る。ＣＯＭ１＝－ｅである。 The display measurement value (B) is an initial display characteristic measured including the detection error (e) by the measurement system. By showing the display measurement value (A) as a reference, B = A + e can be shown. The first correction information (COM 1 ) generated at this time is determined so that the display measurement value (A) and the display measurement value (B) are equal, so that the detection error (e) is canceled out. Determined. That is, COM 1 is obtained from B = A and B = A + e + COM 1 . COM 1 = −e.
　また、表示測定値（Ｃ）は、測定系による検出誤差（ｅ）を含んで測定され。初期の表示特性（Ａ）から表示部４０の光学特性が変化した状態（変化量をΔとして示す）を示す。つまり、Ｃ＝Ａ＋Δ＋ｅである。
　ここで、表示測定値（Ｃ’）は、表示測定値（Ｃ）に第１補正情報（ＣＯＭ１）の補正を行うことにより得られる。つまり、次式のように表示測定値（Ｃ’）を表示測定値（Ａ）と表示部４０の光学特性の変化量Δとにより示すことができる。 The display measurement value (C) is measured including a detection error (e) by the measurement system. The state in which the optical characteristics of the display unit 40 have changed from the initial display characteristics (A) (the amount of change is indicated by Δ) is shown. That is, C = A + Δ + e.
Here, the display measurement value (C ′) is obtained by correcting the display measurement value (C) with the first correction information (COM 1 ). That is, the display measurement value (C ′) can be represented by the display measurement value (A) and the change Δ of the optical characteristic of the display unit 40 as in the following equation.
Ｃ’＝Ｃ＋ＣＯＭ１
　　＝（Ａ＋Δ＋ｅ）－ｅ
　　＝Ａ＋Δ C ′ = C + COM 1
= (A + Δ + e) −e
= A + Δ
　よって、簡易に用いるセンサ部２による測定であっても、表示部４０の光学特性の変化量Δを正確に得ることができる。 Therefore, even if the measurement is performed by the sensor unit 2 that is simply used, the change Δ of the optical characteristic of the display unit 40 can be accurately obtained.
（第２実施形態）
　本実施形態の他の態様について示す。以下に示す実施形態では、表示部の校正を行うだけではなく、所望の画質特性に変化させる場合について説明する。
　図３は、本実施形態における表示装置のブロック図である。図１と同じ構成には、同じ符号を付す。
　表示装置１は、検出情報取得部１０、補正情報生成部２０Ｂ、ルックアップテーブル部３０、表示部４０、目標画質設定部５０、操作部８０、及び、制御部９０Ｂを備える。 (Second Embodiment)
Another aspect of the present embodiment will be described. In the embodiment described below, a case where not only the display unit is calibrated but also changed to a desired image quality characteristic will be described.
FIG. 3 is a block diagram of the display device in the present embodiment. The same components as those in FIG.
The display device 1 includes a detection information acquisition unit 10, a correction information generation unit 20B, a lookup table unit 30, a display unit 40, a target image quality setting unit 50, an operation unit 80, and a control unit 90B.
　補正情報生成部２０Ｂは、検出情報取得部１０からセンサ部２によって検出された検出情報を得て、目標画質設定部５０から目標画質情報を得て、表示部４０の光学特性の変化を補正する補正情報を生成する。
　補正情報生成部２０Ｂは、基準情報記憶部２１、第１検出情報記憶部２２、第１補正情報記憶部２３、現在特性記憶部２４、第１補正情報生成部２５、第２補正情報生成部２６、及び、第３補正情報生成部２７を備える。
　第３補正情報生成部２７は、第２補正情報生成部２６によって生成された第２補正情報と、目標画質情報とに基づいた第３補正情報を生成する。 The correction information generation unit 20B obtains detection information detected by the sensor unit 2 from the detection information acquisition unit 10, obtains target image quality information from the target image quality setting unit 50, and corrects a change in optical characteristics of the display unit 40. Generate correction information.
The correction information generation unit 20B includes a reference information storage unit 21, a first detection information storage unit 22, a first correction information storage unit 23, a current characteristic storage unit 24, a first correction information generation unit 25, and a second correction information generation unit 26. , And a third correction information generation unit 27.
The third correction information generation unit 27 generates third correction information based on the second correction information generated by the second correction information generation unit 26 and the target image quality information.
　目標画質特性生成部５０は、制御部９０Ｂからの制御指令に応じて、表示装置１における表示特性を所望の特性にする目標画質情報を生成する。
　目標画質特性生成部５０は、目標画質特性記憶部５１と目標画質特性取得部５２を備える。
　目標画質特性記憶部５１は、複数のプロファイリングデータ（５１ａから５１ｃ、以下、まとめて示す場合は、「５１ａ等」と記す）を記憶する。
　プロファイリングデータ５１ａ等は、例えば表示装置１を適用する用途に応じて設けられ、それぞれの用途に応じた特性にあわせた表示特性となるように、表示装置１の表示特性を設定する情報である。
　目標画質特性取得部５２は、制御部９０Ｂからの制御指令に応じて、指定された表示特性を示す識別情報により、表示装置１の表示特性を所望の特性にする目標画質情報を生成する。
　ルックアップテーブル部３０は、設定された目標画質情報に応じて生成された第３補正情報により光学特性を調整する。 The target image quality characteristic generation unit 50 generates target image quality information that makes the display characteristic of the display device 1 a desired characteristic in response to a control command from the control unit 90B.
The target image quality characteristic generation unit 50 includes a target image quality characteristic storage unit 51 and a target image quality characteristic acquisition unit 52.
The target image quality characteristic storage unit 51 stores a plurality of profiling data (51a to 51c, hereinafter referred to as “51a etc.” when collectively shown).
The profiling data 51a or the like is information for setting display characteristics of the display device 1 so as to be provided according to the application to which the display device 1 is applied, for example.
The target image quality characteristic acquisition unit 52 generates target image quality information that makes the display characteristic of the display device 1 a desired characteristic based on the identification information indicating the designated display characteristic in accordance with a control command from the control unit 90B.
The look-up table unit 30 adjusts the optical characteristics based on the third correction information generated according to the set target image quality information.
　制御部９０Ｂは、制御部９０（図１）に加えて、操作部８０によって検出された情報に応じて、所望の目標画質特性を得られるように目標画質特性生成部５０を制御する。
　制御部９０Ｂは、表示特性の測定に先立ち、目標画質特性を決定し、その結果に応じたプロファイリングデータ５１ａ等から、目標画質特性取得部５２に目標画質情報を生成させる。 In addition to the control unit 90 (FIG. 1), the control unit 90B controls the target image quality characteristic generation unit 50 so as to obtain a desired target image quality characteristic according to the information detected by the operation unit 80.
Prior to the display characteristic measurement, the control unit 90B determines the target image quality characteristic, and causes the target image quality characteristic acquisition unit 52 to generate target image quality information from the profiling data 51a and the like according to the result.
　上記に示した構成を備えることにより、第３補正情報生成部２７が、目標画質特性生成部５０によって生成された目標画質情報に基づいた第３補正情報を生成することができる。
　第３補正情報には、目標画質情報にもとづいて生成されていることにより、ルックアップテーブル部３０に格納されている変換テーブルの情報を所望の目標画質に応じて生成することができる。 With the configuration described above, the third correction information generation unit 27 can generate third correction information based on the target image quality information generated by the target image quality characteristic generation unit 50.
Since the third correction information is generated based on the target image quality information, the information of the conversion table stored in the lookup table unit 30 can be generated according to the desired target image quality.
　また、本実施形態においては、目標画質情報は、初期の表示特性の測定時と、現在の表示特性の測定時とにおいても同じ値に設定されている。
　第１実施形態にも示したように、第１補正情報生成部２５と、第２補正情報生成部２６によって、異なるタイミングにより２つの補正情報が生成されるが、その第２補正情報には、目標画質情報の成分を含まずに生成することができる。 In the present embodiment, the target image quality information is set to the same value when measuring the initial display characteristics and when measuring the current display characteristics.
As shown in the first embodiment, the first correction information generation unit 25 and the second correction information generation unit 26 generate two correction information at different timings. It can be generated without including the component of the target image quality information.
　なお、本発明は、上記の各実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で変更可能である。
　例えば、本実施形態とし示した初期特性は、白点輝度色度、ガンマ特性、色域などがある。その初期特性は、工場調整時などにリファレンスとなるセンサで表示装置１を測定して得ることができる。 The present invention is not limited to the above embodiments, and can be modified without departing from the spirit of the present invention.
For example, the initial characteristics shown in the present embodiment include white point luminance chromaticity, gamma characteristics, and color gamut. The initial characteristics can be obtained by measuring the display device 1 with a sensor serving as a reference during factory adjustment.
　また、本実施形態に示した表示装置１は、第１検出情報記憶部２２と現在特性記憶部２４を備えることとすることにより、複数の測定項目における検出結果に基づいて、補正情報を生成することができる。複数の測定項目に関連付けての演算処理を行わない場合には、上記の記憶部を削除してもよい。 Further, the display device 1 shown in the present embodiment includes the first detection information storage unit 22 and the current characteristic storage unit 24, thereby generating correction information based on the detection results of a plurality of measurement items. be able to. When the calculation process associated with a plurality of measurement items is not performed, the above storage unit may be deleted.
　また、本実施形態に示した表示装置１は、外部から映像信号が供給されるものとしたが、表示部４０と同じ筐体内に設けられた映像信号生成部により生成されるものであってもよい。そのような表示装置１としては、例えば、パーソナルコンピュータなどがあげられる。 The display device 1 shown in the present embodiment is supplied with a video signal from the outside, but may be generated by a video signal generation unit provided in the same casing as the display unit 40. Good. An example of such a display device 1 is a personal computer.
　また、２つの情報に基づいて補正情報を生成する処理は、任意の既存の技術を利用することができる。
　例えば、例えばＸＹＺ値やＲＧＢ値などのセンサ値は、三次元色空間におけるベクトルとして扱える。このベクトルに３行３列の補正行列を内積して直交変換を行うことにより、一般的な色空間の拡大縮小や回転効果が得られる。この直交変換（ベクトル演算）により、センサ誤差も効果的に補正できる。このベクトル演算を本実施形態に適用した際の補正効果を図４に示す。
　この図４において、三次元色空間（ｘｙｚ）はｘｙ平面に射影して示されている。三次元色空間（ｘｙｚ）において、第１検出情報（ＸｓＹｓＺｓ）として検出された色相空間Ｒ１Ｇ１Ｂ１を補正して、第２補正情報（ＸＹＺ）として示される色相空間Ｒ２Ｇ２Ｂ２を得る。この補正により、センサ部２によって検出された色相空間Ｒ１Ｇ１Ｂ１における白点Ｗ１についても、この補正により白点Ｗ２に移すことができる。また、上記のベクトル演算の具体的な補正式を図５に例示する。この演算により、第１検出情報を示すベクトル［ＸｓＹｓＺｓ］Ｔを、第２補正情報を示すベクトル［Ｘ　Ｙ　Ｚ］Ｔに変換する（添え字「Ｔ」は、転置ベクトルを示す）。 Moreover, the process which produces | generates correction | amendment information based on two information can utilize arbitrary existing techniques.
For example, sensor values such as XYZ values and RGB values can be handled as vectors in a three-dimensional color space. By performing an orthogonal transformation by applying an inner product of a 3 × 3 correction matrix to this vector, a general color space enlargement / reduction and rotation effect can be obtained. Sensor error can also be effectively corrected by this orthogonal transformation (vector operation). FIG. 4 shows the correction effect when this vector operation is applied to this embodiment.
In FIG. 4, the three-dimensional color space (xyz) is shown projected onto the xy plane. In the three-dimensional color space (xyz), the hue space R 1 G 1 B 1 detected as the first detection information (XsYsZs) is corrected, and the hue space R 2 G 2 B indicated as the second correction information (XYZ). Get 2 . By this correction, the white point W 1 in the hue space R 1 G 1 B 1 detected by the sensor unit 2 can also be moved to the white point W 2 by this correction. FIG. 5 shows a specific correction formula for the vector calculation. By this calculation, the vector [XsYsZs] T indicating the first detection information is converted into the vector [X Y Z] T indicating the second correction information (the subscript “T” indicates a transposed vector).
　上述の表示装置１は内部に、コンピュータシステムを有している。そして、上述した表示装置１における表示特性を補正する処理過程は、プログラムの形式でコンピュータ読み取り可能な記録媒体に記憶されており、このプログラムをコンピュータが読み出して実行することによって、上記処理が行われる。ここでコンピュータ読み取り可能な記録媒体とは、磁気ディスク、光磁気ディスク、ＣＤ－ＲＯＭ、ＤＶＤ－ＲＯＭ、半導体メモリ等をいう。また、このコンピュータプログラムを通信回線によってコンピュータに配信し、この配信を受けたコンピュータが当該プログラムを実行するようにしても良い。 The display device 1 described above has a computer system inside. The process of correcting the display characteristics in the display device 1 described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing this program. . Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.
　安定した色再現を行うことが必要とされる表示装置に適用することにより、を向上させることができ、表示部の光学特性を容易に校正することができる。
　安定した色再現を行うことが必要とされる用途としては、例えばグラフィックデザイン・印刷所・医療用などのディスプレイがあげられる。このような用途に用いられることにより、より有効な効果を奏することができる。 By applying it to a display device that needs to perform stable color reproduction, it is possible to improve and to calibrate the optical characteristics of the display unit easily.
Applications that require stable color reproduction include, for example, displays for graphic design, printing shops, and medical use. By being used for such applications, more effective effects can be achieved.
　１　　表示装置
　２　　センサ部
１０　　検出情報取得部
２０、２０Ｂ　　補正情報生成部
２１　　基準情報記憶部
２２　　第１検出情報記憶部
２３　　第１補正情報記憶部
２４　　現在特性記憶部
２５　　第１補正情報生成部
２６　　第２補正情報生成部
２７　　第３補正情報生成部
３０　　ルックアップテーブル部
４０　　表示部
５０　　目標画質設定部
８０　　操作部
９０、９０Ｂ　　制御部 DESCRIPTION OF SYMBOLS 1 Display apparatus 2 Sensor part 10 Detection information acquisition part 20, 20B Correction information generation part 21 Reference | standard information storage part 22 First detection information storage part 23 First correction information storage part 24 Current characteristic storage part 25 First correction information generation part 26 Second correction information generation unit 27 Third correction information generation unit 30 Look-up table unit 40 Display unit 50 Target image quality setting unit 80 Operation units 90 and 90B Control unit

Claims (7)

  1. 　映像信号に応じた映像情報を表示する表示部を備え、前記表示部の表示特性を検出した測光部からの検出情報を得る表示装置であって、
    　補正情報に基づいて前記表示部における光学特性の変化に応じて前記映像信号を変換する信号変換部と、
    　基準とする画像を前記表示部に表示させる場合に、前記測光部によって検出されるべき前記表示特性として定められる基準値、前記測光部によって検出された前記光学特性を示す第１検出情報、及び、前記第１検出情報が検出された後に前記測光部によって検出された前記光学特性を示す第２検出情報に基づいて、前記光学特性の変化を補正する前記補正情報を生成する補正情報生成部と、
    　前記補正情報に応じて前記光学特性の変化を補正するように制御する制御部と
    　を備えることを特徴とする表示装置。     A display device that includes a display unit that displays video information according to a video signal, and obtains detection information from a photometry unit that detects display characteristics of the display unit,
    A signal conversion unit that converts the video signal according to a change in optical characteristics in the display unit based on correction information;
    When displaying a reference image on the display unit, a reference value defined as the display characteristic to be detected by the photometric unit, first detection information indicating the optical characteristic detected by the photometric unit, and A correction information generating unit that generates the correction information for correcting a change in the optical characteristics, based on second detection information indicating the optical characteristics detected by the photometry unit after the first detection information is detected;
    And a control unit that controls to correct the change in the optical characteristics in accordance with the correction information.
  2. 　前記補正情報生成部は、
    　前記基準値と前記第１検出情報とに基づいた第１補正情報を生成する第１補正情報生成部と、
    　前記第１補正情報と前記第２検出情報とに基づいた第２補正情報を生成する第２補正情報生成部と、
    　を備えることを特徴とする請求項１に記載の表示装置。     The correction information generation unit
    A first correction information generating unit that generates first correction information based on the reference value and the first detection information;
    A second correction information generating unit that generates second correction information based on the first correction information and the second detection information;
    The display device according to claim 1, further comprising:
  3. 　前記制御部は、
    　前記基準値と前記第１検出情報との差が、あらかじめ定められる所定の値を越える場合は、前記信号変換部において前記第２補正情報に基づいた補正を行ない、
    　前記基準値と前記第１検出情報との差が、あらかじめ定められる所定の値に満たない場合は、前記信号変換部において前記第２補正情報に基づいた補正を行わないようにする
    　ことを特徴とする請求項１に記載の表示装置。     The controller is
    When the difference between the reference value and the first detection information exceeds a predetermined value, a correction based on the second correction information is performed in the signal converter,
    When the difference between the reference value and the first detection information is less than a predetermined value determined in advance, the signal converter is configured not to perform correction based on the second correction information. The display device according to claim 1.
  4. 　前記測光部からの検出情報を得る検出情報取得部
    　を備え、
    　前記制御部は、
    　前記検出情報取得部に前記測光部が最初に接続されたことを検出し、前記測光部によって検出された前記表示特性を、前記補正情報生成部における前記第１検出情報とする
    　ことを特徴とする請求項１に記載の表示装置。     A detection information acquisition unit for obtaining detection information from the photometry unit,
    The controller is
    It is detected that the photometry unit is first connected to the detection information acquisition unit, and the display characteristic detected by the photometry unit is used as the first detection information in the correction information generation unit. The display device according to claim 1.
  5. 　前記光学特性を所望の特性にする目標画質情報を生成する目標画質特性生成部
    　を備え、
    　前記補正情報生成部は、
    　前記第２補正情報と前記目標画質情報とに基づいた第３補正情報を生成する第３補正情報生成部
    　を備え、
    　前記信号変換部は、
    　前記設定された目標画質情報に応じて生成された前記第３補正情報により前記表示部における光学特性の変化に応じて前記映像信号を変換する
    　ことを特徴とする請求項１に記載の表示装置。     A target image quality characteristic generating unit that generates target image quality information that makes the optical characteristic a desired characteristic;
    The correction information generation unit
    A third correction information generating unit for generating third correction information based on the second correction information and the target image quality information;
    The signal converter is
    The display device according to claim 1, wherein the video signal is converted according to a change in optical characteristics of the display unit by the third correction information generated according to the set target image quality information.
  6. 　映像信号に応じた映像情報を表示する表示部を備え、前記表示部の表示特性を検出した測光部からの検出情報を得る表示装置のコンピュータに、
    　補正情報に基づいて前記表示部における光学特性の変化に応じて前記映像信号を変換するステップと、
    　基準とする画像を前記表示部に表示させる場合に、前記測光部によって検出されるべき前記表示特性として定められる基準値、前記測光部によって検出された前記光学特性を示す第１検出情報、及び、前記第１検出情報が検出された後に前記測光部によって検出された前記光学特性を示す第２検出情報に基づいて、前記光学特性の変化を補正する前記補正情報を生成するステップと、
    　前記補正情報に応じて前記光学特性の変化を補正するように制御するステップと
    　を実行させるプログラム。     A display unit that displays video information corresponding to a video signal, and a display device computer that obtains detection information from a photometric unit that detects display characteristics of the display unit,
    Converting the video signal in accordance with a change in optical characteristics in the display unit based on correction information;
    When displaying a reference image on the display unit, a reference value defined as the display characteristic to be detected by the photometric unit, first detection information indicating the optical characteristic detected by the photometric unit, and Generating the correction information for correcting the change in the optical characteristics based on the second detection information indicating the optical characteristics detected by the photometry unit after the first detection information is detected;
    And a step of controlling to correct the change in the optical characteristics in accordance with the correction information.
  7. 　映像信号に応じた映像情報を表示する表示部を備え、前記表示部の表示特性を検出した測光部からの検出情報を得る表示装置における画質調整方法であって、
    　補正情報に基づいて前記表示部における光学特性の変化に応じて前記映像信号を変換する過程と、
    　基準とする画像を前記表示部に表示させる場合に、前記測光部によって検出されるべき前記表示特性として定められる基準値、前記測光部によって検出された前記光学特性を示す第１検出情報、及び、前記第１検出情報が検出された後に前記測光部によって検出された前記光学特性を示す第２検出情報に基づいて、前記光学特性の変化を補正する前記補正情報を生成する過程と、
    　前記補正情報に応じて前記光学特性の変化を補正するように制御する過程と
    　を含むことを特徴とする画質調整方法。     An image quality adjustment method in a display device comprising a display unit that displays video information according to a video signal, and obtaining detection information from a photometric unit that detects display characteristics of the display unit,
    A process of converting the video signal according to a change in optical characteristics in the display unit based on correction information;
    When displaying a reference image on the display unit, a reference value defined as the display characteristic to be detected by the photometric unit, first detection information indicating the optical characteristic detected by the photometric unit, and Generating the correction information for correcting a change in the optical characteristics based on the second detection information indicating the optical characteristics detected by the photometry unit after the first detection information is detected;
    And a process of controlling to correct the change in the optical characteristic according to the correction information.
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