WO2012073341A1 - Display device and correction method for display device - Google Patents
Display device and correction method for display device Download PDFInfo
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- WO2012073341A1 WO2012073341A1 PCT/JP2010/071400 JP2010071400W WO2012073341A1 WO 2012073341 A1 WO2012073341 A1 WO 2012073341A1 JP 2010071400 W JP2010071400 W JP 2010071400W WO 2012073341 A1 WO2012073341 A1 WO 2012073341A1
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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
- 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
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0693—Calibration of display systems
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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
- 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
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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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
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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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
Definitions
- the present invention relates to a display device and a display device calibration method.
- the present invention has been made to solve the above-described problem, and provides a display device and a display device calibration method capable of easily calibrating an image quality that has changed with long-term use. It is.
- the pre-correction image quality characteristic acquisition unit includes an image quality characteristic detection unit that receives a light flux of the non-image quality correction image and detects the pre-correction image quality characteristic value.
- the pre-correction image quality characteristic value is luminance versus gradation data of the non-image quality corrected image, and each of the plurality of types of target image quality characteristic values is: It is the luminance vs. gradation data corresponding to the target image quality.
- a display device calibration method includes a first step in which a display unit captures a non-corrected video signal and displays a non-image quality corrected image; A second step in which the image quality characteristic acquisition unit acquires an image quality characteristic value before correction based on the non-image quality corrected image displayed by the display unit, and the target image quality characteristic acquisition unit stores a plurality of types of target image quality characteristic values.
- FIG. 6 It is a block diagram showing the functional structure of the display apparatus which is one Embodiment of this invention.
- 6 is a flowchart illustrating a procedure of image quality calibration processing of a display unit in the embodiment. It is the figure which plotted the brightness
- FIG. 1 is a block diagram showing a functional configuration of a display device according to an embodiment of the present invention.
- the display device 1 is a device that takes in a video signal supplied from an external video signal generator and displays a video.
- the video signal is, for example, data of 12 bits for each of red, green, and blue (RGB).
- the display device 1 includes a pre-correction image quality characteristic storage unit 20, a target image quality characteristic storage unit 30, a target image quality characteristic acquisition unit 40, a correction data generation unit 50, a lookup table 60, a display unit 70, and an operation unit. 80 and a control unit 90.
- the non-image quality corrected image is an image displayed on the display unit 70 in a state where the image quality is not corrected. Therefore, the pre-correction image quality characteristic value is an image quality characteristic value before the image quality is corrected.
- the image quality characteristic detection unit 10 may be provided when the image quality of the display device 1 is calibrated, or may be provided so that a part of a light beam emitted from the display unit 70 can always be received.
- the display unit 70 captures the corrected video signal (corrected video signal) or the uncorrected video signal (uncorrected video signal) supplied from the lookup table 60 and displays the video.
- the display unit 70 includes a display panel that displays an image.
- the display unit 70 includes a liquid crystal display panel, a PDP (Plasma Display Panel), an organic EL (Electro-Luminescence) display panel, and the like.
- the display unit 70 may be realized by including a D / A (digital / analog) conversion circuit and a CRT (Cathode Ray Tube).
- the display device 1 performs an image quality calibration process every time a use period during which the image quality characteristics of the display unit 70 may change is passed.
- the use period is, for example, 1000 hours.
- the target image quality characteristic storage unit 30 stores target image quality characteristic values representing a plurality of types of image quality characteristics.
- the target image quality characteristic value is a target value of the image quality characteristic to be corrected by the display unit 70.
- luminance versus gradation data representing the gamma characteristic
- the coordinate value of the white point in the display image and each chromaticity coordinate of RGB in the color gamut Value.
- the target image quality characteristic storage unit 30 stores target image quality characteristic values representing three types of image quality characteristics as profile data 31a, 31b, and 31c.
- the target image quality characteristic storage unit 30 stores luminance versus gradation data indicating image quality characteristics suitable for print preview as profile data 31a, and luminance versus gradation indicating image quality characteristics suitable for display of a captured image by a video camera. Data is stored as profile data 31b, and luminance versus gradation data indicating image quality characteristics suitable for text display is stored as profile data 31c. Note that the target image quality characteristic storage unit 30 may store profile data defined by the user.
- the target image quality characteristic acquisition unit 40 reads one type of target image quality characteristic value selected by the control of the control unit 90 from the target image quality characteristic storage unit 30 and holds it. That is, in FIG. 1, the target image quality characteristic acquisition unit 40 is selected by the control of the control unit 90 from the profile data 31a, 31b, 31c including the luminance versus gradation data stored in the target image quality characteristic storage unit 30. Read and hold one type of profile data.
- the correction data generation unit 50 has an image quality characteristic suitable for displaying a captured image by the video camera based on the luminance versus gradation data already read from the pre-correction image quality characteristic storage unit 20 and the captured profile data 31b. Second correction data for correction is generated, and the second correction data is written in an area different from the storage area of the first correction data in the lookup table 60. Further, the correction data generation unit 50 takes in the profile data 31 c including the luminance versus gradation data from the target image quality characteristic acquisition unit 40. Then, the correction data generation unit 50 corrects the image quality characteristic suitable for text display based on the luminance versus gradation data already read from the pre-correction image quality characteristic storage unit 20 and the captured profile data 31c. 3 is generated, and the third correction data is written in an area different from the storage area of the first and second correction data in the lookup table 60. A specific example of a process in which the correction data generation unit 50 generates correction data will be described later.
- the look-up table 60 is a video signal correction unit that corrects a video signal with the correction data written by the correction data generation unit 50, and is realized by a semiconductor storage device such as a flash memory.
- the look-up table 60 receives video signal data as an address input, outputs correction data stored in the addressed data area as a corrected video signal, and supplies the corrected video signal to the display unit 70.
- the storage area of the correction data used for correction is specified by the control of the control unit 90.
- the control unit 90 designates a storage area by, for example, address decoding processing.
- the look-up table 60 stores uncorrected data that does not correct the video signal in advance, and can output the uncorrected video signal by address decoding processing by the control unit 90.
- the OSD menu includes an image quality calibration processing start tab for starting the image quality calibration processing of the display unit 70.
- the OSD menu has a profile selection having three profile selection tabs for selecting one of the first to third correction data set in the lookup table 60 in correspondence with the profile data 31a, 31b, 31c. Includes menu.
- the OSD menu newly registers (stores) profile data defined by the user in the target image quality characteristic storage unit 30, changes the contents of the already registered profile data 31a, 31b, 31c, Includes a profile data editing menu for deleting definition profile data.
- the control unit 90 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), and a ROM (Read Only Memory) (not shown), and the CPU reads a program stored in the ROM and executes it. By doing so, each part of the display device 1 is controlled.
- a CPU Central Processing Unit
- RAM Random Access Memory
- ROM Read Only Memory
- the control unit 90 when the key value of the setting value change button is supplied to the control unit 90 by pressing the setting value change button of the operation unit 80, the control unit 90 reads the OSD menu from the ROM and displays the display unit 70. To display. If the key code of the movement instruction button is supplied to the control unit 90 when the movement instruction button of the operation unit 80 is pressed while the OSD menu is displayed, the control unit 90 uses the cursor as the key code. In response, the display is moved and displayed, or the value of the item currently indicated by the cursor is increased or decreased according to the key code.
- FIG. 2 is a flowchart showing the procedure of the image quality calibration process of the display unit 70 of the display device 1. This calibration process is executed for the display device 1 whose use period of about 1000 hours has passed.
- the display device 1 executes the processing according to the flowchart of FIG.
- step S1 the OSD menu is displayed on the display unit 70, and the setting value changing button of the setting unit changing button is pressed when the setting value changing button of the operation unit 80 is pressed while the cursor indicates the image quality calibration processing start tab.
- the control unit 90 starts image quality calibration processing of the display unit 70.
- step S ⁇ b> 2 the control unit 90 controls the uncorrected data in the lookup table 60 to be readable, and causes the lookup table 60 to output an uncorrected video signal.
- the control unit 90 instructs the image quality characteristic detection unit 10 to detect the pre-correction image quality characteristic value.
- the control unit 90 stores the pre-correction image quality characteristic value detected by the image quality characteristic detection unit 10 in the pre-correction image quality characteristic storage unit 20.
- the control unit 90 causes the pre-correction image quality characteristic storage unit 20 to store luminance versus gradation data in the non-image quality corrected image detected by the image quality characteristic detection unit 10.
- the target image quality characteristic acquisition unit 40 selects one type of target image quality characteristic value from among a plurality of types of target image quality characteristic values stored in the target image quality characteristic storage unit 30 under the control of the control unit 90. And hold it.
- the target image quality characteristic acquisition unit 40 reads and holds the profile data 31a from the profile data 31a, 31b, 31c including the luminance versus gradation data stored in the target image quality characteristic storage unit 30 under the control of the control unit 90.
- step S4 the correction data generation unit 50 reads the pre-correction image quality characteristic value from the pre-correction image quality characteristic storage unit 20, and takes in the target image quality characteristic value from the target image quality characteristic acquisition unit 40.
- the correction data generation unit 50 generates correction data based on the read pre-correction image quality characteristic value and the captured target image quality characteristic value.
- the correction data generation unit 50 reads the luminance versus gradation data, which is the pre-correction image quality characteristic value, from the pre-correction image quality characteristic storage unit 20, and the profile data 31a including the luminance versus gradation data from the target image quality characteristic acquisition unit 40. take in.
- the correction data generation unit 50 generates first correction data for correcting image quality characteristics suitable for print preview based on the read luminance versus gradation data and the acquired profile data 31a.
- the horizontal axis represents the input gradation of the display unit
- the vertical axis represents the luminance of the display unit.
- the vertical axis is the correction LUT (lookup table) input gradation
- the horizontal axis is the correction LUT output gradation.
- the correction data generation unit 50 can obtain the corrected image quality characteristic shown in the third quadrant by repeatedly executing the procedure A to the procedure C for all the gradations.
- the corrected image quality characteristic in the third quadrant can be obtained.
- the value is set as correction data to be set in the lookup table 60.
- step S5 the correction data generation unit 50 writes the correction data generated in the process of step S4 into the lookup table 60.
- the correction data generation unit 50 writes the generated first correction data in the lookup table 60.
- the correction data generation unit 50 takes in the target image quality characteristic value from the target image quality characteristic acquisition unit 40.
- the correction data generation unit 50 generates correction data based on the pre-correction image quality characteristic value already read in step S2 and the target image quality characteristic value fetched in step S4.
- the correction data generation unit 50 takes in the profile data 31b including the luminance versus gradation data from the target image quality characteristic acquisition unit 40.
- the correction data generation unit 50 corrects image quality characteristics suitable for display of a captured image by the video camera based on the already read luminance versus gradation data and the acquired profile data 31b. Generate correction data.
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Abstract
The present invention is provided with: a lookup table (60) that outputs corrected video signals obtained by correcting video signals; a display unit (70) that acquires a corrected or uncorrected video signal and displays video; an image-quality-characteristic detection unit (10) that detects light from an image of uncorrected image quality, displayed by the display unit (70) upon acquisition of an uncorrected video signal, and obtains a pre-correction image-quality-characteristic value; a target-image-quality-characteristic storage unit (30) that stores a plurality of profiles; a target-image-quality-characteristic retrieval unit (40) that selects and retrieves one profile from the target-image-quality-characteristic storage unit (30); and a correction-data generation unit (50) that generates correction data on the basis of the pre-correction image-quality-characteristic value and the retrieved profile, allocates memory space to the lookup table (60), and writes the generated correction data thereto.
Description
本発明は、表示装置および表示装置の校正方法に関する。
The present invention relates to a display device and a display device calibration method.
従来、特性が異なる複数の画質特性プロファイルデータを記憶し、これら画質特性プロファイルデータのうちいずれかを設定して動作する液晶パネル表示装置が知られている。この液晶パネル表示装置は、表示に適用する画質特性プロファイルデータを、ユーザによる操作ボタンの操作によって選択し設定する。よって、ユーザは、用途や目的等に応じて画質特性プロファイルデータを切り替えて液晶パネル表示装置を使用することができる。
Conventionally, there is known a liquid crystal panel display device that stores a plurality of image quality characteristic profile data having different characteristics and operates by setting one of these image quality characteristic profile data. In this liquid crystal panel display device, image quality characteristic profile data to be applied to display is selected and set by the operation of an operation button by a user. Therefore, the user can use the liquid crystal panel display device by switching the image quality characteristic profile data in accordance with the application or purpose.
このような液晶パネル表示装置は、長期間の使用に伴い、例えば液晶パネルの経時劣化等によって画質特性が変化することがある。よって、高品位な表示画質を保つためには、液晶パネル表示装置の画質設定を校正する必要がある。
従来、蛍光体の経時劣化による輝度変化に対応してホワイトバランス調整を行う表示装置が知られている（例えば、特許文献１参照）。 With such a liquid crystal panel display device, the image quality characteristics may change due to, for example, deterioration over time of the liquid crystal panel with long-term use. Therefore, in order to maintain a high-quality display image quality, it is necessary to calibrate the image quality setting of the liquid crystal panel display device.
2. Description of the Related Art Conventionally, a display device that performs white balance adjustment in response to a luminance change due to deterioration with time of a phosphor is known (see, for example, Patent Document 1).
従来、蛍光体の経時劣化による輝度変化に対応してホワイトバランス調整を行う表示装置が知られている（例えば、特許文献１参照）。 With such a liquid crystal panel display device, the image quality characteristics may change due to, for example, deterioration over time of the liquid crystal panel with long-term use. Therefore, in order to maintain a high-quality display image quality, it is necessary to calibrate the image quality setting of the liquid crystal panel display device.
2. Description of the Related Art Conventionally, a display device that performs white balance adjustment in response to a luminance change due to deterioration with time of a phosphor is known (see, for example, Patent Document 1).
しかしながら、従来の表示装置では、画質特性プロファイルデータごとに表示を切り替えて画質を校正する必要があり、画質の校正作業は手間がかかるものであり煩雑であった。
そこで、本発明は、上記課題を解決するためになされたものであり、長期間の使用に伴って変化した画質を簡便に校正することができる、表示装置および表示装置の校正方法を提供するものである。 However, in the conventional display device, it is necessary to calibrate the image quality by switching the display for each image quality characteristic profile data, and the image quality calibration work is troublesome and cumbersome.
Accordingly, the present invention has been made to solve the above-described problem, and provides a display device and a display device calibration method capable of easily calibrating an image quality that has changed with long-term use. It is.
そこで、本発明は、上記課題を解決するためになされたものであり、長期間の使用に伴って変化した画質を簡便に校正することができる、表示装置および表示装置の校正方法を提供するものである。 However, in the conventional display device, it is necessary to calibrate the image quality by switching the display for each image quality characteristic profile data, and the image quality calibration work is troublesome and cumbersome.
Accordingly, the present invention has been made to solve the above-described problem, and provides a display device and a display device calibration method capable of easily calibrating an image quality that has changed with long-term use. It is.
［１］上記の課題を解決するため、本発明の一態様である表示装置は、映像信号を補正した補正映像信号を出力するルックアップテーブルと、前記ルックアップテーブルが出力する前記補正映像信号、および非補正映像信号を取り込んで映像を表示する表示部と、前記非補正映像信号を取り込んだ前記表示部が表示する非画質補正画像に基づいて補正前画質特性値を取得する補正前画質特性取得部と、複数種類の目標画質特性値を記憶する目標画質特性記憶部と、前記目標画質特性記憶部から前記複数種類の目標画質特性値のうち一種類の目標画質特性値を選択して取得する目標画質特性取得部と、前記補正前画質特性取得部が取得した前記補正前画質特性値と前記目標画質特性取得部が取得した前記一種類の目標画質特性値とに基づいて前記映像信号を補正するための補正データを生成し、この補正データを前記ルックアップテーブルに記憶領域を区分して書き込む補正データ生成部と、を備えることを特徴とする。
［２］上記［１］記載の表示装置において、前記補正前画質特性取得部は、前記非画質補正画像の光束を受光して前記補正前画質特性値を検出する画質特性検出部を含むことを特徴とする。
［３］上記［１］または［２］記載の表示装置において、前記補正前画質特性値は、前記非画質補正画像の輝度対階調データであり、前記複数種類の目標画質特性値それぞれは、目標画質に対応する輝度対階調データであることを特徴とする。 [1] In order to solve the above problem, a display device according to one aspect of the present invention includes a lookup table that outputs a corrected video signal obtained by correcting a video signal, and the corrected video signal that is output by the lookup table. And a display unit that captures an uncorrected video signal and displays the image, and an image quality characteristic before correction that acquires an uncorrected image quality characteristic value based on a non-image quality corrected image displayed by the display unit that captures the uncorrected video signal A target image quality characteristic storage unit for storing a plurality of types of target image quality characteristic values, and selecting and obtaining one type of target image quality characteristic value from the plurality of types of target image quality characteristic values from the target image quality characteristic storage unit Based on the target image quality characteristic acquisition unit, the pre-correction image quality characteristic value acquired by the pre-correction image quality characteristic acquisition unit, and the one type of target image quality characteristic value acquired by the target image quality characteristic acquisition unit And generating correction data for correcting the image signal to the correction data generating unit for writing the correction data by dividing the storage area in the look-up table, comprising: a.
[2] In the display device according to [1], the pre-correction image quality characteristic acquisition unit includes an image quality characteristic detection unit that receives a light flux of the non-image quality correction image and detects the pre-correction image quality characteristic value. Features.
[3] In the display device according to [1] or [2], the pre-correction image quality characteristic value is luminance versus gradation data of the non-image quality corrected image, and each of the plurality of types of target image quality characteristic values is: It is the luminance vs. gradation data corresponding to the target image quality.
［２］上記［１］記載の表示装置において、前記補正前画質特性取得部は、前記非画質補正画像の光束を受光して前記補正前画質特性値を検出する画質特性検出部を含むことを特徴とする。
［３］上記［１］または［２］記載の表示装置において、前記補正前画質特性値は、前記非画質補正画像の輝度対階調データであり、前記複数種類の目標画質特性値それぞれは、目標画質に対応する輝度対階調データであることを特徴とする。 [1] In order to solve the above problem, a display device according to one aspect of the present invention includes a lookup table that outputs a corrected video signal obtained by correcting a video signal, and the corrected video signal that is output by the lookup table. And a display unit that captures an uncorrected video signal and displays the image, and an image quality characteristic before correction that acquires an uncorrected image quality characteristic value based on a non-image quality corrected image displayed by the display unit that captures the uncorrected video signal A target image quality characteristic storage unit for storing a plurality of types of target image quality characteristic values, and selecting and obtaining one type of target image quality characteristic value from the plurality of types of target image quality characteristic values from the target image quality characteristic storage unit Based on the target image quality characteristic acquisition unit, the pre-correction image quality characteristic value acquired by the pre-correction image quality characteristic acquisition unit, and the one type of target image quality characteristic value acquired by the target image quality characteristic acquisition unit And generating correction data for correcting the image signal to the correction data generating unit for writing the correction data by dividing the storage area in the look-up table, comprising: a.
[2] In the display device according to [1], the pre-correction image quality characteristic acquisition unit includes an image quality characteristic detection unit that receives a light flux of the non-image quality correction image and detects the pre-correction image quality characteristic value. Features.
[3] In the display device according to [1] or [2], the pre-correction image quality characteristic value is luminance versus gradation data of the non-image quality corrected image, and each of the plurality of types of target image quality characteristic values is: It is the luminance vs. gradation data corresponding to the target image quality.
［４］上記の課題を解決するため、本発明の一態様である表示装置の校正方法は、表示部が、非補正映像信号を取り込んで非画質補正画像を表示する第１ステップと、補正前画質特性取得部が、前記表示部が表示する前記非画質補正画像に基づいて補正前画質特性値を取得する第２ステップと、目標画質特性取得部が、複数種類の目標画質特性値を記憶する目標画質特性記憶部から一種類の目標画質特性値を選択して取得する第３ステップと、前記第２ステップにおいて前記補正前画質特性取得部が検出した前記補正前画質特性値と前記第３ステップにおいて前記目標画質特性取得部が取得した前記一種類の目標画質特性値とに基づいて映像信号を補正するための補正データを生成し、この補正データをルックアップテーブルに記憶領域を区分して書き込む第４ステップと、を有することを特徴とする。
[4] In order to solve the above-described problem, a display device calibration method according to an aspect of the present invention includes a first step in which a display unit captures a non-corrected video signal and displays a non-image quality corrected image; A second step in which the image quality characteristic acquisition unit acquires an image quality characteristic value before correction based on the non-image quality corrected image displayed by the display unit, and the target image quality characteristic acquisition unit stores a plurality of types of target image quality characteristic values. A third step of selecting and acquiring one type of target image quality characteristic value from the target image quality characteristic storage unit, and the pre-correction image quality characteristic value detected by the pre-correction image quality characteristic acquisition unit in the second step and the third step Correction data for correcting the video signal is generated based on the one type of target image quality characteristic value acquired by the target image quality characteristic acquisition unit, and the correction data is stored in a lookup table. A fourth step of writing minute to, and having a.
本発明によれば、長期間の使用に伴って変化した画質を簡便に校正することができる。
According to the present invention, it is possible to easily calibrate the image quality that has changed with long-term use.
以下、本発明を実施するための形態について、図面を参照して詳細に説明する。
図１は、本発明の一実施形態である表示装置の機能構成を表すブロック図である。同図に示すように、表示装置１は、外部の映像信号発生装置から供給される映像信号を取り込んで映像を表示する装置である。映像信号は、例えば、赤色・緑色・青色（ＲＧＢ）各１２ビットのデータである。
表示装置１は、補正前画質特性記憶部２０と、目標画質特性記憶部３０と、目標画質特性取得部４０と、補正データ生成部５０と、ルックアップテーブル６０と、表示部７０と、操作部８０と、制御部９０とを備える。 Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing a functional configuration of a display device according to an embodiment of the present invention. As shown in the figure, thedisplay device 1 is a device that takes in a video signal supplied from an external video signal generator and displays a video. The video signal is, for example, data of 12 bits for each of red, green, and blue (RGB).
Thedisplay device 1 includes a pre-correction image quality characteristic storage unit 20, a target image quality characteristic storage unit 30, a target image quality characteristic acquisition unit 40, a correction data generation unit 50, a lookup table 60, a display unit 70, and an operation unit. 80 and a control unit 90.
図１は、本発明の一実施形態である表示装置の機能構成を表すブロック図である。同図に示すように、表示装置１は、外部の映像信号発生装置から供給される映像信号を取り込んで映像を表示する装置である。映像信号は、例えば、赤色・緑色・青色（ＲＧＢ）各１２ビットのデータである。
表示装置１は、補正前画質特性記憶部２０と、目標画質特性記憶部３０と、目標画質特性取得部４０と、補正データ生成部５０と、ルックアップテーブル６０と、表示部７０と、操作部８０と、制御部９０とを備える。 Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing a functional configuration of a display device according to an embodiment of the present invention. As shown in the figure, the
The
図１において、表示装置１には画質特性検出部１０が接続されている。画質特性検出部１０は、例えば光学センサであり、その受光部側を表示部７０の表示面に対向して設けた状態で画質特性値を検出する。画質特性値は、表示部７０の画質特性を表すデータであり、例えば、ガンマ特性を表す輝度対階調データ、表示画像における白色点（ホワイトポイント）の座標値、色域におけるＲＧＢの各色度座標値である。本実施形態では、画質特性検出部１０は、表示部７０が表示する非画質補正画像の光束の一部を受光して補正前画質特性値を検出する。非画質補正画像は、画質の補正を行っていない状態で表示部７０に表示される画像である。よって、補正前画質特性値は、画質を補正する前の画質特性値である。
画質特性検出部１０は、表示装置１の画質の校正を行うときに設けられるものとしてもよいし、表示部７０が発光する光束の一部を常に受光可能に設けられるものとしてもよい。 In FIG. 1, an image qualitycharacteristic detection unit 10 is connected to the display device 1. The image quality characteristic detection unit 10 is an optical sensor, for example, and detects the image quality characteristic value in a state where the light receiving unit side is provided facing the display surface of the display unit 70. The image quality characteristic value is data representing the image quality characteristic of the display unit 70. For example, luminance versus gradation data representing the gamma characteristic, the coordinate value of the white point (white point) in the display image, and each chromaticity coordinate of RGB in the color gamut. Value. In the present embodiment, the image quality characteristic detection unit 10 receives a part of the light flux of the non-image quality corrected image displayed by the display unit 70 and detects the pre-correction image quality characteristic value. The non-image quality corrected image is an image displayed on the display unit 70 in a state where the image quality is not corrected. Therefore, the pre-correction image quality characteristic value is an image quality characteristic value before the image quality is corrected.
The image qualitycharacteristic detection unit 10 may be provided when the image quality of the display device 1 is calibrated, or may be provided so that a part of a light beam emitted from the display unit 70 can always be received.
画質特性検出部１０は、表示装置１の画質の校正を行うときに設けられるものとしてもよいし、表示部７０が発光する光束の一部を常に受光可能に設けられるものとしてもよい。 In FIG. 1, an image quality
The image quality
表示部７０は、ルックアップテーブル６０から供給される、補正された映像信号（補正映像信号）または補正されない映像信号（非補正映像信号）を取り込んで映像を表示する。表示部７０は、画像を表示する表示パネルを含むものであり、例えば、液晶表示パネル、ＰＤＰ（Ｐｌａｓｍａ Ｄｉｓｐｌａｙ Ｐａｎｅｌ）、有機ＥＬ（Ｅｌｅｃｔｒｏ－Ｌｕｍｉｎｅｓｃｅｎｃｅ）表示パネル等を含んで実現される。なお、表示部７０は、Ｄ／Ａ（デジタル／アナログ）変換回路とＣＲＴ（Ｃａｔｈｏｄｅ Ｒａｙ Ｔｕｂｅ）とを含んで実現されるものであってもよい。
The display unit 70 captures the corrected video signal (corrected video signal) or the uncorrected video signal (uncorrected video signal) supplied from the lookup table 60 and displays the video. The display unit 70 includes a display panel that displays an image. For example, the display unit 70 includes a liquid crystal display panel, a PDP (Plasma Display Panel), an organic EL (Electro-Luminescence) display panel, and the like. The display unit 70 may be realized by including a D / A (digital / analog) conversion circuit and a CRT (Cathode Ray Tube).
表示部７０は、長期間にわたって映像を表示することにより、表示パネルやＣＲＴの劣化が発生して画質特性が変化することがある。よって、表示装置１は、表示部７０の画質特性が変化する可能性がある使用期間を経過するたびに、画質の校正処理が実施される。本実施形態では、当該使用期間を例えば１０００時間とする。
When the display unit 70 displays an image for a long period of time, the display panel or the CRT may be deteriorated to change image quality characteristics. Therefore, the display device 1 performs an image quality calibration process every time a use period during which the image quality characteristics of the display unit 70 may change is passed. In the present embodiment, the use period is, for example, 1000 hours.
補正前画質特性記憶部２０は、画質特性検出部１０が検出する補正前画質特性値を取り込んで記憶する。例えば、補正前画質特性記憶部２０は、画質特性検出部１０が検出する非画質補正画像の輝度対階調データを取り込んで記憶する。補正前画質特性記憶部２０は、例えば半導体記憶装置により実現される。
画質特性検出部１０と補正前画質特性記憶部２０とは、補正前画質特性取得部を構成するものである。 The pre-correction image qualitycharacteristic storage unit 20 captures and stores the pre-correction image quality characteristic value detected by the image quality characteristic detection unit 10. For example, the pre-correction image quality characteristic storage unit 20 captures and stores luminance versus gradation data of the non-image quality corrected image detected by the image quality characteristic detection unit 10. The pre-correction image quality characteristic storage unit 20 is realized by, for example, a semiconductor storage device.
The image qualitycharacteristic detection unit 10 and the pre-correction image quality characteristic storage unit 20 constitute a pre-correction image quality characteristic acquisition unit.
画質特性検出部１０と補正前画質特性記憶部２０とは、補正前画質特性取得部を構成するものである。 The pre-correction image quality
The image quality
目標画質特性記憶部３０は、複数種類の画質特性を表す目標画質特性値を記憶する。目標画質特性値は、表示部７０の補正される画質特性の目標値であり、例えば、ガンマ特性を表す輝度対階調データ、表示画像における白色点の座標値、色域におけるＲＧＢの各色度座標値である。図１においては、目標画質特性記憶部３０は、三種類の画質特性を表す目標画質特性値をプロファイルデータ３１ａ，３１ｂ，３１ｃとして記憶する。例えば、目標画質特性記憶部３０は、印刷プレビューに適した画質特性を示す輝度対階調データをプロファイルデータ３１ａとして記憶し、ビデオカメラによる撮影映像の表示に適した画質特性を示す輝度対階調データをプロファイルデータ３１ｂとして記憶し、テキスト表示に適した画質特性を示す輝度対階調データをプロファイルデータ３１ｃとして記憶する。
なお、目標画質特性記憶部３０は、ユーザによって定義されたプロファイルデータを記憶するようにしてもよい。 The target image qualitycharacteristic storage unit 30 stores target image quality characteristic values representing a plurality of types of image quality characteristics. The target image quality characteristic value is a target value of the image quality characteristic to be corrected by the display unit 70. For example, luminance versus gradation data representing the gamma characteristic, the coordinate value of the white point in the display image, and each chromaticity coordinate of RGB in the color gamut Value. In FIG. 1, the target image quality characteristic storage unit 30 stores target image quality characteristic values representing three types of image quality characteristics as profile data 31a, 31b, and 31c. For example, the target image quality characteristic storage unit 30 stores luminance versus gradation data indicating image quality characteristics suitable for print preview as profile data 31a, and luminance versus gradation indicating image quality characteristics suitable for display of a captured image by a video camera. Data is stored as profile data 31b, and luminance versus gradation data indicating image quality characteristics suitable for text display is stored as profile data 31c.
Note that the target image qualitycharacteristic storage unit 30 may store profile data defined by the user.
なお、目標画質特性記憶部３０は、ユーザによって定義されたプロファイルデータを記憶するようにしてもよい。 The target image quality
Note that the target image quality
目標画質特性取得部４０は、制御部９０の制御によって選択される一種類の目標画質特性値を目標画質特性記憶部３０から読み込んで保持する。すなわち、図１においては、目標画質特性取得部４０は、目標画質特性記憶部３０に記憶された輝度対階調データを含むプロファイルデータ３１ａ，３１ｂ，３１ｃの中から制御部９０の制御によって選択される一種類のプロファイルデータを読み込んで保持する。
The target image quality characteristic acquisition unit 40 reads one type of target image quality characteristic value selected by the control of the control unit 90 from the target image quality characteristic storage unit 30 and holds it. That is, in FIG. 1, the target image quality characteristic acquisition unit 40 is selected by the control of the control unit 90 from the profile data 31a, 31b, 31c including the luminance versus gradation data stored in the target image quality characteristic storage unit 30. Read and hold one type of profile data.
補正データ生成部５０は、補正前画質特性記憶部２０から補正前画質特性値を読み込む。また、補正データ生成部５０は、目標画質特性取得部４０から目標画質特性値を一種類ずつ取り込む。補正データ生成部５０は、補正前画質特性記憶部２０から読み込んだ補正前画質特性値と、目標画質特性記憶部３０から順次取り込む目標画質特性値とに基づいて、補正データを順次生成し、補正データをルックアップテーブル６０に重複しないように記憶領域を区分して書き込む。
The correction data generation unit 50 reads the pre-correction image quality characteristic value from the pre-correction image quality characteristic storage unit 20. Further, the correction data generation unit 50 takes in the target image quality characteristic values one by one from the target image quality characteristic acquisition unit 40. The correction data generation unit 50 sequentially generates correction data based on the pre-correction image quality characteristic value read from the pre-correction image quality characteristic storage unit 20 and the target image quality characteristic value sequentially fetched from the target image quality characteristic storage unit 30 to perform correction. The storage area is divided and written so that the data is not duplicated in the lookup table 60.
例えば、補正データ生成部５０は、補正前画質特性記憶部２０から補正前画質特性値である輝度対階調データを読み込み、目標画質特性取得部４０から輝度対階調データを含むプロファイルデータ３１ａを取り込む。そして、補正データ生成部５０は、読み込んだ輝度対階調データと取り込んだプロファイルデータ３１ａとに基づいて、印刷プレビューに適した画質特性に補正するための第１の補正データを生成し、この第１の補正データをルックアップテーブル６０に書き込む。
また、補正データ生成部５０は、目標画質特性取得部４０から輝度対階調データを含むプロファイルデータ３１ｂを取り込む。そして、補正データ生成部５０は、補正前画質特性記憶部２０から既に読み込んである輝度対階調データと取り込んだプロファイルデータ３１ｂとに基づいて、ビデオカメラによる撮影映像の表示に適した画質特性に補正するための第２の補正データを生成し、この第２の補正データをルックアップテーブル６０の第１の補正データの記憶領域とは異なる領域に書き込む。
また、補正データ生成部５０は、目標画質特性取得部４０から輝度対階調データを含むプロファイルデータ３１ｃを取り込む。そして、補正データ生成部５０は、補正前画質特性記憶部２０から既に読み込んである輝度対階調データと取り込んだプロファイルデータ３１ｃとに基づいて、テキスト表示に適した画質特性に補正するための第３の補正データを生成し、この第３の補正データをルックアップテーブル６０の第１および第２の補正データの記憶領域とは異なる領域に書き込む。
補正データ生成部５０が補正データを生成する処理の具体例については後述する。 For example, the correctiondata generation unit 50 reads the luminance versus gradation data, which is the pre-correction image quality characteristic value, from the pre-correction image quality characteristic storage unit 20, and the profile data 31a including the luminance versus gradation data from the target image quality characteristic acquisition unit 40. take in. Then, the correction data generation unit 50 generates first correction data for correcting image quality characteristics suitable for print preview based on the read luminance versus gradation data and the acquired profile data 31a. 1 correction data is written in the lookup table 60.
Further, the correctiondata generation unit 50 takes in the profile data 31b including the luminance versus gradation data from the target image quality characteristic acquisition unit 40. Then, the correction data generation unit 50 has an image quality characteristic suitable for displaying a captured image by the video camera based on the luminance versus gradation data already read from the pre-correction image quality characteristic storage unit 20 and the captured profile data 31b. Second correction data for correction is generated, and the second correction data is written in an area different from the storage area of the first correction data in the lookup table 60.
Further, the correctiondata generation unit 50 takes in the profile data 31 c including the luminance versus gradation data from the target image quality characteristic acquisition unit 40. Then, the correction data generation unit 50 corrects the image quality characteristic suitable for text display based on the luminance versus gradation data already read from the pre-correction image quality characteristic storage unit 20 and the captured profile data 31c. 3 is generated, and the third correction data is written in an area different from the storage area of the first and second correction data in the lookup table 60.
A specific example of a process in which the correctiondata generation unit 50 generates correction data will be described later.
また、補正データ生成部５０は、目標画質特性取得部４０から輝度対階調データを含むプロファイルデータ３１ｂを取り込む。そして、補正データ生成部５０は、補正前画質特性記憶部２０から既に読み込んである輝度対階調データと取り込んだプロファイルデータ３１ｂとに基づいて、ビデオカメラによる撮影映像の表示に適した画質特性に補正するための第２の補正データを生成し、この第２の補正データをルックアップテーブル６０の第１の補正データの記憶領域とは異なる領域に書き込む。
また、補正データ生成部５０は、目標画質特性取得部４０から輝度対階調データを含むプロファイルデータ３１ｃを取り込む。そして、補正データ生成部５０は、補正前画質特性記憶部２０から既に読み込んである輝度対階調データと取り込んだプロファイルデータ３１ｃとに基づいて、テキスト表示に適した画質特性に補正するための第３の補正データを生成し、この第３の補正データをルックアップテーブル６０の第１および第２の補正データの記憶領域とは異なる領域に書き込む。
補正データ生成部５０が補正データを生成する処理の具体例については後述する。 For example, the correction
Further, the correction
Further, the correction
A specific example of a process in which the correction
ルックアップテーブル６０は、補正データ生成部５０が書き込んだ補正データによって映像信号を補正する映像信号補正部であり、例えばフラッシュメモリ（Ｆｌａｓｈ Ｍｅｍｏｒｙ）等の半導体記憶装置によって実現される。ルックアップテーブル６０は、映像信号のデータをアドレス入力とし、アドレス指定されたデータ領域に記憶された補正データを補正映像信号として出力し表示部７０に供給する。ルックアップテーブル６０に記憶された補正データ（例えば、第１－第３の補正データ）のうち補正に使用する補正データの記憶領域は、制御部９０の制御によって指定される。制御部９０は、例えばアドレスデコード処理によって記憶領域を指定する。
また、ルックアップテーブル６０は、映像信号を補正しない非補正データをあらかじめ記憶しており、制御部９０によるアドレスデコード処理によって非補正映像信号を出力することもできる。 The look-up table 60 is a video signal correction unit that corrects a video signal with the correction data written by the correctiondata generation unit 50, and is realized by a semiconductor storage device such as a flash memory. The look-up table 60 receives video signal data as an address input, outputs correction data stored in the addressed data area as a corrected video signal, and supplies the corrected video signal to the display unit 70. Of the correction data (for example, the first to third correction data) stored in the lookup table 60, the storage area of the correction data used for correction is specified by the control of the control unit 90. The control unit 90 designates a storage area by, for example, address decoding processing.
The look-up table 60 stores uncorrected data that does not correct the video signal in advance, and can output the uncorrected video signal by address decoding processing by thecontrol unit 90.
また、ルックアップテーブル６０は、映像信号を補正しない非補正データをあらかじめ記憶しており、制御部９０によるアドレスデコード処理によって非補正映像信号を出力することもできる。 The look-up table 60 is a video signal correction unit that corrects a video signal with the correction data written by the correction
The look-up table 60 stores uncorrected data that does not correct the video signal in advance, and can output the uncorrected video signal by address decoding processing by the
操作部８０は、複数の操作ボタンを具備し、これら操作ボタンの操作に応じてキーコードを発生し制御部９０に供給する。操作ボタンは、例えば、表示装置１の電源を入切するための電源オン／オフボタン、表示装置１の各種設定値を変更するためのＯＳＤ（Ｏｎ Ｓｃｒｅｅｎ Ｄｉｓｐｌａｙ）メニューを表示させ、このＯＳＤメニューから所望の項目を選択するための設定値変更用ボタン、ＯＳＤメニュー上のカーソルを移動させたり、設定値を増減したりするための移動指示ボタンである。
The operation unit 80 includes a plurality of operation buttons, generates a key code according to the operation of these operation buttons, and supplies the key code to the control unit 90. The operation buttons display, for example, a power on / off button for turning on / off the display device 1 and an OSD (On Screen Display) menu for changing various setting values of the display device 1. A setting value changing button for selecting a desired item, and a movement instruction button for moving the cursor on the OSD menu and increasing / decreasing the setting value.
ＯＳＤメニューは、表示部７０の画質の校正処理を開始させるための画質校正処理開始タブを含む。また、ＯＳＤメニューは、プロファイルデータ３１ａ，３１ｂ，３１ｃに対応させてルックアップテーブル６０に設定した第１－第３の補正データのうちいずれかを選択させるための三つのプロファイル選択タブを有するプロファイル選択メニューを含む。また、ＯＳＤメニューは、ユーザに定義させたプロファイルデータを目標画質特性記憶部３０に新たに登録（記憶）したり、既に登録されているプロファイルデータ３１ａ，３１ｂ，３１ｃの内容を変更したり、ユーザ定義用のプロファイルデータを削除したりするためのプロファイルデータの編集メニューを含む。
The OSD menu includes an image quality calibration processing start tab for starting the image quality calibration processing of the display unit 70. In addition, the OSD menu has a profile selection having three profile selection tabs for selecting one of the first to third correction data set in the lookup table 60 in correspondence with the profile data 31a, 31b, 31c. Includes menu. The OSD menu newly registers (stores) profile data defined by the user in the target image quality characteristic storage unit 30, changes the contents of the already registered profile data 31a, 31b, 31c, Includes a profile data editing menu for deleting definition profile data.
制御部９０は、それぞれ図示しない、ＣＰＵ（Ｃｅｎｔｒａｌ Ｐｒｏｃｅｓｓｉｎｇ Ｕｎｉｔ）とＲＡＭ（Ｒａｎｄｏｍ Ａｃｃｅｓｓ Ｍｅｍｏｒｙ）とＲＯＭ（Ｒｅａｄ Ｏｎｌｙ Ｍｅｍｏｒｙ）とを含んで構成され、ＲＯＭに記憶されたプログラムをＣＰＵがＲＡＭに読み出して実行することによって、表示装置１の各部を制御する。
The control unit 90 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), and a ROM (Read Only Memory) (not shown), and the CPU reads a program stored in the ROM and executes it. By doing so, each part of the display device 1 is controlled.
例えば、操作部８０の設定値変更用ボタンが押されたことにより設定値変更用ボタンのキーコードが制御部９０に供給されると、制御部９０は、ＲＯＭからＯＳＤメニューを読み出して表示部７０に表示させる。また、ＯＳＤメニューが表示された状態で、操作部８０の移動指示ボタンが押されたことにより移動指示ボタンのキーコードが制御部９０に供給されると、制御部９０は、カーソルをキーコードに応じて移動させて表示させたり、現在カーソルが示している項目の値をキーコードに応じて増加または減少させたりする。また、ＯＳＤメニューが表示され、カーソルが画質校正処理開始タブを示した状態で、操作部８０の設定値変更用ボタンが押されたことにより設定値変更用ボタンのキーコードが制御部９０に供給されると、制御部９０は、表示部７０の画質の校正処理を開始する。また、プロファイル選択メニューが表示され、カーソルが所望のプロファイル選択タブを示した状態で、操作部８０の設定値変更用ボタンが押されたことにより設定値変更用ボタンのキーコードが制御部９０に供給されると、制御部９０は、当該プロファイル選択タブに対応する補正データの記憶領域をルックアップテーブル６０に対して読み出し可能に指定する。
For example, when the key value of the setting value change button is supplied to the control unit 90 by pressing the setting value change button of the operation unit 80, the control unit 90 reads the OSD menu from the ROM and displays the display unit 70. To display. If the key code of the movement instruction button is supplied to the control unit 90 when the movement instruction button of the operation unit 80 is pressed while the OSD menu is displayed, the control unit 90 uses the cursor as the key code. In response, the display is moved and displayed, or the value of the item currently indicated by the cursor is increased or decreased according to the key code. In addition, when the OSD menu is displayed and the cursor indicates the image quality calibration processing start tab and the setting value changing button of the operation unit 80 is pressed, the key code of the setting value changing button is supplied to the control unit 90. Then, the control unit 90 starts a calibration process for the image quality of the display unit 70. In addition, when the profile selection menu is displayed and the cursor indicates the desired profile selection tab and the setting value changing button of the operation unit 80 is pressed, the key code of the setting value changing button is displayed on the control unit 90. When supplied, the control unit 90 designates the correction data storage area corresponding to the profile selection tab to be readable to the lookup table 60.
次に、本実施形態である表示装置１が表示部７０の画質を校正する動作について説明する。図２は、表示装置１の表示部７０の画質の校正処理の手順を表すフローチャートである。約１０００時間の使用期間が経過した表示装置１について、この校正処理は実行される。画質特性検出部１０が、その受光部側を表示部７０の表示面に対向させて設けられた状態で、表示装置１は、同図のフローチャートによる処理を実行する。
Next, an operation in which the display device 1 according to the present embodiment calibrates the image quality of the display unit 70 will be described. FIG. 2 is a flowchart showing the procedure of the image quality calibration process of the display unit 70 of the display device 1. This calibration process is executed for the display device 1 whose use period of about 1000 hours has passed. In a state where the image quality characteristic detection unit 10 is provided with the light receiving unit side facing the display surface of the display unit 70, the display device 1 executes the processing according to the flowchart of FIG.
まず、ステップＳ１において、ＯＳＤメニューが表示部７０に表示され、カーソルが画質校正処理開始タブを示した状態で、操作部８０の設定値変更用ボタンが押されたことにより設定値変更用ボタンのキーコードが制御部９０に供給されると、制御部９０は、表示部７０の画質の校正処理を開始する。
First, in step S1, the OSD menu is displayed on the display unit 70, and the setting value changing button of the setting unit changing button is pressed when the setting value changing button of the operation unit 80 is pressed while the cursor indicates the image quality calibration processing start tab. When the key code is supplied to the control unit 90, the control unit 90 starts image quality calibration processing of the display unit 70.
次に、ステップＳ２において、制御部９０は、ルックアップテーブル６０の非補正データを読み出し可能に制御し、ルックアップテーブル６０から非補正映像信号を出力させる。次に、制御部９０は、画質特性検出部１０に補正前画質特性値の検出を指示する。次に、制御部９０は、画質特性検出部１０が検出した補正前画質特性値を補正前画質特性記憶部２０に記憶させる。例えば、制御部９０は、画質特性検出部１０が検出した非画質補正画像における輝度対階調データを補正前画質特性記憶部２０に記憶させる。
Next, in step S <b> 2, the control unit 90 controls the uncorrected data in the lookup table 60 to be readable, and causes the lookup table 60 to output an uncorrected video signal. Next, the control unit 90 instructs the image quality characteristic detection unit 10 to detect the pre-correction image quality characteristic value. Next, the control unit 90 stores the pre-correction image quality characteristic value detected by the image quality characteristic detection unit 10 in the pre-correction image quality characteristic storage unit 20. For example, the control unit 90 causes the pre-correction image quality characteristic storage unit 20 to store luminance versus gradation data in the non-image quality corrected image detected by the image quality characteristic detection unit 10.
次に、ステップＳ３において、目標画質特性取得部４０は、制御部９０の制御によって目標画質特性記憶部３０に記憶された複数種類の目標画質特性値の中から一種類の目標画質特性値を選択して読み込み保持する。例えば、目標画質特性取得部４０は、制御部９０の制御によって目標画質特性記憶部３０に記憶された輝度対階調データを含むプロファイルデータ３１ａ，３１ｂ，３１ｃからプロファイルデータ３１ａを読み込んで保持する。
Next, in step S3, the target image quality characteristic acquisition unit 40 selects one type of target image quality characteristic value from among a plurality of types of target image quality characteristic values stored in the target image quality characteristic storage unit 30 under the control of the control unit 90. And hold it. For example, the target image quality characteristic acquisition unit 40 reads and holds the profile data 31a from the profile data 31a, 31b, 31c including the luminance versus gradation data stored in the target image quality characteristic storage unit 30 under the control of the control unit 90.
次に、ステップＳ４において、補正データ生成部５０は、補正前画質特性記憶部２０から補正前画質特性値を読み込み、目標画質特性取得部４０から目標画質特性値を取り込む。次に、補正データ生成部５０は、読み込んだ補正前画質特性値と取り込んだ目標画質特性値とに基づいて補正データを生成する。例えば、補正データ生成部５０は、補正前画質特性記憶部２０から補正前画質特性値である輝度対階調データを読み込み、目標画質特性取得部４０から輝度対階調データを含むプロファイルデータ３１ａを取り込む。次に、補正データ生成部５０は、読み込んだ輝度対階調データと取り込んだプロファイルデータ３１ａとに基づいて、印刷プレビューに適した画質特性に補正するための第１の補正データを生成する。
Next, in step S4, the correction data generation unit 50 reads the pre-correction image quality characteristic value from the pre-correction image quality characteristic storage unit 20, and takes in the target image quality characteristic value from the target image quality characteristic acquisition unit 40. Next, the correction data generation unit 50 generates correction data based on the read pre-correction image quality characteristic value and the captured target image quality characteristic value. For example, the correction data generation unit 50 reads the luminance versus gradation data, which is the pre-correction image quality characteristic value, from the pre-correction image quality characteristic storage unit 20, and the profile data 31a including the luminance versus gradation data from the target image quality characteristic acquisition unit 40. take in. Next, the correction data generation unit 50 generates first correction data for correcting image quality characteristics suitable for print preview based on the read luminance versus gradation data and the acquired profile data 31a.
ここで、補正データ生成部５０が補正前画質特性値と目標画質特性値とに基づいて補正データを生成する具体例について説明する。
図３は、輝度対階調データをグラフ化した図である。同図に示すグラフは４象限図であり、そのうちの第１象限が目標画質特性を表し、第２象限が補正前画質特性を表し、第３象限がルックアップテーブル６０による補正画質特性を表す。第１象限の目標画質特性は、横軸が表示装置の入力階調であり、縦軸が表示部の輝度である。第２象限の補正前画質特性は、横軸が表示部の入力階調であり、縦軸が表示部の輝度である。第３象限の補正画質特性は、縦軸が補正ＬＵＴ（ルックアップテーブル）入力階調であり、横軸が補正ＬＵＴ出力階調である。 Here, a specific example in which the correctiondata generation unit 50 generates correction data based on the pre-correction image quality characteristic value and the target image quality characteristic value will be described.
FIG. 3 is a graph of luminance versus gradation data. The graph shown in the figure is a quadrant diagram, in which the first quadrant represents the target image quality characteristic, the second quadrant represents the pre-correction image quality characteristic, and the third quadrant represents the corrected image quality characteristic by the lookup table 60. In the target image quality characteristics in the first quadrant, the horizontal axis represents the input gradation of the display device, and the vertical axis represents the luminance of the display unit. In the image quality characteristics before correction in the second quadrant, the horizontal axis represents the input gradation of the display unit, and the vertical axis represents the luminance of the display unit. In the corrected image quality characteristic of the third quadrant, the vertical axis is the correction LUT (lookup table) input gradation, and the horizontal axis is the correction LUT output gradation.
図３は、輝度対階調データをグラフ化した図である。同図に示すグラフは４象限図であり、そのうちの第１象限が目標画質特性を表し、第２象限が補正前画質特性を表し、第３象限がルックアップテーブル６０による補正画質特性を表す。第１象限の目標画質特性は、横軸が表示装置の入力階調であり、縦軸が表示部の輝度である。第２象限の補正前画質特性は、横軸が表示部の入力階調であり、縦軸が表示部の輝度である。第３象限の補正画質特性は、縦軸が補正ＬＵＴ（ルックアップテーブル）入力階調であり、横軸が補正ＬＵＴ出力階調である。 Here, a specific example in which the correction
FIG. 3 is a graph of luminance versus gradation data. The graph shown in the figure is a quadrant diagram, in which the first quadrant represents the target image quality characteristic, the second quadrant represents the pre-correction image quality characteristic, and the third quadrant represents the corrected image quality characteristic by the lookup table 60. In the target image quality characteristics in the first quadrant, the horizontal axis represents the input gradation of the display device, and the vertical axis represents the luminance of the display unit. In the image quality characteristics before correction in the second quadrant, the horizontal axis represents the input gradation of the display unit, and the vertical axis represents the luminance of the display unit. In the corrected image quality characteristic of the third quadrant, the vertical axis is the correction LUT (lookup table) input gradation, and the horizontal axis is the correction LUT output gradation.
まず、手順Ａとして、補正データ生成部５０は、第１象限において表示装置入力階調値ｘを選択し、その表示装置入力階調値ｘに対応する目標輝度値ｙを求める。
次に、手順Ｂとして、補正データ生成部５０は、第２象限を適用して、目標輝度ｙに対応する表示部入力階調値ｘ’（シングルクォーテーション）を求める。
次に、手順Ｃとして、補正データ生成部５０は、表示装置入力階調値ｘを補正ＬＵＴ入力階調値ｘとし、この補正ＬＵＴ入力階調値ｘと表示部入力階調値ｘ’（シングルクォーテーション）との交点を補正データとして決定する。
補正データ生成部５０は、上記手順Ａから手順Ｃまでを全ての階調に対して繰り返し実行することによって、第３象限に示す補正画質特性を得ることができ、この第３象限の補正画質特性値をルックアップテーブル６０に設定する補正データとする。 First, as procedure A, the correctiondata generation unit 50 selects a display device input gradation value x in the first quadrant, and obtains a target luminance value y corresponding to the display device input gradation value x.
Next, as the procedure B, the correctiondata generation unit 50 applies the second quadrant to obtain the display unit input gradation value x ′ (single quotation) corresponding to the target luminance y.
Next, as the procedure C, the correctiondata generation unit 50 sets the display device input tone value x as the correction LUT input tone value x, and the correction LUT input tone value x and the display unit input tone value x ′ (single The point of intersection with (quotation) is determined as correction data.
The correctiondata generation unit 50 can obtain the corrected image quality characteristic shown in the third quadrant by repeatedly executing the procedure A to the procedure C for all the gradations. The corrected image quality characteristic in the third quadrant can be obtained. The value is set as correction data to be set in the lookup table 60.
次に、手順Ｂとして、補正データ生成部５０は、第２象限を適用して、目標輝度ｙに対応する表示部入力階調値ｘ’（シングルクォーテーション）を求める。
次に、手順Ｃとして、補正データ生成部５０は、表示装置入力階調値ｘを補正ＬＵＴ入力階調値ｘとし、この補正ＬＵＴ入力階調値ｘと表示部入力階調値ｘ’（シングルクォーテーション）との交点を補正データとして決定する。
補正データ生成部５０は、上記手順Ａから手順Ｃまでを全ての階調に対して繰り返し実行することによって、第３象限に示す補正画質特性を得ることができ、この第３象限の補正画質特性値をルックアップテーブル６０に設定する補正データとする。 First, as procedure A, the correction
Next, as the procedure B, the correction
Next, as the procedure C, the correction
The correction
次に、ステップＳ５において、補正データ生成部５０は、ステップＳ４の処理において生成した補正データをルックアップテーブル６０に書き込む。例えば、補正データ生成部５０は、生成した第１の補正データをルックアップテーブル６０に書き込む。
Next, in step S5, the correction data generation unit 50 writes the correction data generated in the process of step S4 into the lookup table 60. For example, the correction data generation unit 50 writes the generated first correction data in the lookup table 60.
次に、ステップＳ６において、制御部９０は、目標画質特性記憶部３０に他の目標画質特性値が記憶されているか否かを判定する。そして、制御部９０は、目標画質特性記憶部３０に他の目標画質特性値が記憶されていると判定した場合は、ステップＳ３の処理に戻る。一方、制御部９０は、目標画質特性記憶部３０に他の目標画質特性値が記憶されていないと判定した場合は、本フローチャートの処理を終了する。
Next, in step S <b> 6, the control unit 90 determines whether another target image quality characteristic value is stored in the target image quality characteristic storage unit 30. If the control unit 90 determines that another target image quality characteristic value is stored in the target image quality characteristic storage unit 30, the process returns to step S3. On the other hand, if the control unit 90 determines that no other target image quality characteristic value is stored in the target image quality characteristic storage unit 30, the process of this flowchart ends.
２回目のステップＳ３において、目標画質特性取得部４０は、制御部９０の制御によって目標画質特性記憶部３０に記憶された残りの種類の目標画質特性値の中から一種類の目標画質特性値を選択して読み込み保持する。例えば、目標画質特性取得部４０は、制御部９０の制御によって目標画質特性記憶部３０に記憶された輝度対階調データを含む残りのプロファイルデータ３１ｂ，３１ｃからプロファイルデータ３１ｂを読み込んで保持する。
In the second step S3, the target image quality characteristic acquisition unit 40 obtains one type of target image quality characteristic value from the remaining types of target image quality characteristic values stored in the target image quality characteristic storage unit 30 under the control of the control unit 90. Select and hold. For example, the target image quality characteristic acquisition unit 40 reads and holds the profile data 31b from the remaining profile data 31b and 31c including the luminance versus gradation data stored in the target image quality characteristic storage unit 30 under the control of the control unit 90.
次に、２回目のステップＳ４において、補正データ生成部５０は、目標画質特性取得部４０から目標画質特性値を取り込む。次に、補正データ生成部５０は、ステップＳ２の処理において既に読み込んである補正前画質特性値と本ステップＳ４において取り込んだ目標画質特性値とに基づいて補正データを生成する。例えば、補正データ生成部５０は、目標画質特性取得部４０から輝度対階調データを含むプロファイルデータ３１ｂを取り込む。次に、補正データ生成部５０は、既に読み込んである輝度対階調データと取り込んだプロファイルデータ３１ｂとに基づいて、ビデオカメラによる撮影映像の表示に適した画質特性に補正するための第２の補正データを生成する。
Next, in the second step S <b> 4, the correction data generation unit 50 takes in the target image quality characteristic value from the target image quality characteristic acquisition unit 40. Next, the correction data generation unit 50 generates correction data based on the pre-correction image quality characteristic value already read in step S2 and the target image quality characteristic value fetched in step S4. For example, the correction data generation unit 50 takes in the profile data 31b including the luminance versus gradation data from the target image quality characteristic acquisition unit 40. Next, the correction data generation unit 50 corrects image quality characteristics suitable for display of a captured image by the video camera based on the already read luminance versus gradation data and the acquired profile data 31b. Generate correction data.
次に、２回目のステップＳ５において、補正データ生成部５０は、２回目のステップＳ４の処理において生成した補正データを、ルックアップテーブル６０の前回の書き込み領域とは異なる領域に書き込む。例えば、補正データ生成部５０は、生成した第２の補正データをルックアップテーブル６０の第１の補正データの記憶領域とは異なる領域に書き込む。
Next, in the second step S <b> 5, the correction data generation unit 50 writes the correction data generated in the second step S <b> 4 in an area different from the previous writing area of the lookup table 60. For example, the correction data generation unit 50 writes the generated second correction data in an area different from the storage area of the first correction data in the lookup table 60.
３回目以降のステップＳ３－Ｓ５の処理については、２回目のステップＳ３－Ｓ５の処理と同様であるため、その説明を省略する。
The third and subsequent steps S3 to S5 are the same as the second step S3 to S5, and a description thereof will be omitted.
本発明の一実施形態によれば、例えば１０００時間等の使用期間が経過するごとに一回の画質校正処理を実行することにより、表示装置１は、画質特性検出部１０が検出した補正前画質特性値と目標画質特性記憶部３０に記憶された全ての目標画質特性値とに基づいて、ルックアップテーブル６０に設定された全てのプロファイルに対応する補正データを更新することができる。
よって、本実施形態である表示装置１によれば、長期間の使用に伴って変化した表示部７０の画質を、簡単な操作によって全てのプロファイルに対応して補正することができる。 According to an embodiment of the present invention, thedisplay device 1 performs the pre-correction image quality detected by the image quality characteristic detection unit 10 by executing the image quality calibration process once every time a usage period of, for example, 1000 hours elapses. Based on the characteristic value and all the target image quality characteristic values stored in the target image quality characteristic storage unit 30, the correction data corresponding to all the profiles set in the lookup table 60 can be updated.
Therefore, according to thedisplay device 1 of the present embodiment, the image quality of the display unit 70 that has changed with long-term use can be corrected corresponding to all profiles by a simple operation.
よって、本実施形態である表示装置１によれば、長期間の使用に伴って変化した表示部７０の画質を、簡単な操作によって全てのプロファイルに対応して補正することができる。 According to an embodiment of the present invention, the
Therefore, according to the
なお、上述した実施形態である表示装置の一部の機能をコンピュータで実現するようにしてもよい。この場合、その機能を実現するためのプログラムをコンピュータ読み取り可能な記録媒体に記録して、この記録媒体に記録されたプログラムをコンピュータシステムに読み込ませ、実行することによって実現してもよい。なお、ここでいう「コンピュータシステム」とは、ＯＳ（Ｏｐｅｒａｔｉｎｇ Ｓｙｓｔｅｍ）や周辺装置のハードウェアを含むものである。また、「コンピュータ読み取り可能な記録媒体」とは、フレキシブルディスク、光磁気ディスク、光ディスク、メモリカード等の可搬型記録媒体、コンピュータシステムに内蔵される磁気ハードディスク等の記憶装置のことをいう。さらに「コンピュータ読み取り可能な記録媒体」とは、インターネット等のネットワークや電話回線等の通信回線を介してプログラムを送信する場合の通信線のように、短時間の間、動的にプログラムを保持するもの、その場合のサーバ装置やクライアントとなるコンピュータシステム内部の揮発性メモリのように、一定時間プログラムを保持するものを含んでもよい。また上記のプログラムは、前述した機能の一部を実現するためのものであってもよく、さらに前述した機能をコンピュータシステムにすでに記録されているプログラムとの組み合わせにより実現するものであってもよい。
Note that some of the functions of the display device according to the above-described embodiment may be realized by a computer. In this case, a program for realizing the function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS (Operating System) and hardware of peripheral devices. The “computer-readable recording medium” refers to a portable recording medium such as a flexible disk, a magneto-optical disk, an optical disk, and a memory card, and a storage device such as a magnetic hard disk built in the computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, it may include a device that holds a program for a certain period of time, such as a volatile memory inside a computer system serving as a server device or a client. Further, the above program may be for realizing a part of the functions described above, or may be realized by a combination with the program already recorded in the computer system. .
以上、本発明の実施の形態について図面を参照して詳述したが、具体的な構成はその実施形態に限られるものではなく、本発明の要旨を逸脱しない範囲の設計等も含まれる。
例えば、図２の校正手順では補正データの作成を行わず、補正前画質特性値の記憶だけを行うことが考えられる。この場合は、後日、特定のプロファイルデータが指定された時点で補正データを計算する。指定された時点とは、例えば、電源投入時やユーザによる画質設定変更時である。補正データを記憶するルックアップテーブルは、現在表示されているプロファイルデータの容量だけを有すればよい。このため、プロファイルデータの数が多くなった場合の、ルックアップテーブル数や計算時間等、実装コストを削減することができる。 As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to that embodiment, The design of the range which does not deviate from the summary of this invention, etc. are included.
For example, in the calibration procedure of FIG. 2, it is conceivable that correction data is not created but only the image quality characteristic value before correction is stored. In this case, correction data is calculated later when specific profile data is designated. The designated time is, for example, when the power is turned on or when the image quality setting is changed by the user. The lookup table that stores the correction data need only have the capacity of the currently displayed profile data. For this reason, when the number of profile data increases, the mounting cost such as the number of lookup tables and the calculation time can be reduced.
例えば、図２の校正手順では補正データの作成を行わず、補正前画質特性値の記憶だけを行うことが考えられる。この場合は、後日、特定のプロファイルデータが指定された時点で補正データを計算する。指定された時点とは、例えば、電源投入時やユーザによる画質設定変更時である。補正データを記憶するルックアップテーブルは、現在表示されているプロファイルデータの容量だけを有すればよい。このため、プロファイルデータの数が多くなった場合の、ルックアップテーブル数や計算時間等、実装コストを削減することができる。 As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to that embodiment, The design of the range which does not deviate from the summary of this invention, etc. are included.
For example, in the calibration procedure of FIG. 2, it is conceivable that correction data is not created but only the image quality characteristic value before correction is stored. In this case, correction data is calculated later when specific profile data is designated. The designated time is, for example, when the power is turned on or when the image quality setting is changed by the user. The lookup table that stores the correction data need only have the capacity of the currently displayed profile data. For this reason, when the number of profile data increases, the mounting cost such as the number of lookup tables and the calculation time can be reduced.
本発明は、表示装置、例えば、表示パネルを含む直視型の表示装置、ＣＲＴを含む表示装置、投射型投影装置であるプロジェクタに利用可能である。
The present invention is applicable to a display device, for example, a direct-view display device including a display panel, a display device including a CRT, and a projector that is a projection-type projection device.
１ 表示装置
１０ 画質特性検出部
２０ 補正前画質特性記憶部
３０ 目標画質特性記憶部
３１ａ，３１ｂ，３１ｃ プロファイルデータ
４０ 目標画質特性取得部
５０ 補正データ生成部
６０ ルックアップテーブル
７０ 表示部
８０ 操作部
９０ 制御部 DESCRIPTION OFSYMBOLS 1 Display apparatus 10 Image quality characteristic detection part 20 Image quality characteristic memory | storage part before correction | amendment 30 Target image quality characteristic memory | storage part 31a, 31b, 31c Profile data 40 Target image quality characteristic acquisition part 50 Correction data generation part 60 Look-up table 70 Display part 80 Operation part 90 Control unit
１０ 画質特性検出部
２０ 補正前画質特性記憶部
３０ 目標画質特性記憶部
３１ａ，３１ｂ，３１ｃ プロファイルデータ
４０ 目標画質特性取得部
５０ 補正データ生成部
６０ ルックアップテーブル
７０ 表示部
８０ 操作部
９０ 制御部 DESCRIPTION OF
Claims (4)
- 映像信号を補正した補正映像信号を出力するルックアップテーブルと、
前記ルックアップテーブルが出力する前記補正映像信号、および非補正映像信号を取り込んで映像を表示する表示部と、
前記非補正映像信号を取り込んだ前記表示部が表示する非画質補正画像に基づいて補正前画質特性値を取得する補正前画質特性取得部と、
複数種類の目標画質特性値を記憶する目標画質特性記憶部と、
前記目標画質特性記憶部から前記複数種類の目標画質特性値のうち一種類の目標画質特性値を選択して取得する目標画質特性取得部と、
前記補正前画質特性取得部が取得した前記補正前画質特性値と前記目標画質特性取得部が取得した前記一種類の目標画質特性値とに基づいて前記映像信号を補正するための補正データを生成し、この補正データを前記ルックアップテーブルに記憶領域を区分して書き込む補正データ生成部と、
を備えることを特徴とする表示装置。 A lookup table for outputting a corrected video signal obtained by correcting the video signal;
A display unit that captures the corrected video signal output by the lookup table and the non-corrected video signal and displays the video;
A pre-correction image quality characteristic acquisition unit that acquires a pre-correction image quality characteristic value based on a non-image quality correction image displayed by the display unit that has captured the non-correction video signal;
A target image quality characteristic storage unit for storing a plurality of types of target image quality characteristic values;
A target image quality characteristic acquisition unit that selects and acquires one type of target image quality characteristic value from the target image quality characteristic storage unit;
Generate correction data for correcting the video signal based on the pre-correction image quality characteristic value acquired by the pre-correction image quality characteristic acquisition unit and the one type of target image quality characteristic value acquired by the target image quality characteristic acquisition unit. A correction data generation unit that writes the correction data in the lookup table by dividing a storage area;
A display device comprising: - 前記補正前画質特性取得部は、
前記非画質補正画像の光束を受光して前記補正前画質特性値を検出する画質特性検出部
を含むことを特徴とする請求項１記載の表示装置。 The pre-correction image quality characteristic acquisition unit
The display device according to claim 1, further comprising: an image quality characteristic detecting unit that receives a light flux of the non-image quality corrected image and detects the image quality characteristic value before correction. - 前記補正前画質特性値は、前記非画質補正画像の輝度対階調データであり、
前記複数種類の目標画質特性値それぞれは、目標画質に対応する輝度対階調データである
ことを特徴とする請求項１または２記載の表示装置。 The pre-correction image quality characteristic value is luminance versus gradation data of the non-image quality corrected image,
The display device according to claim 1, wherein each of the plurality of types of target image quality characteristic values is luminance versus gradation data corresponding to the target image quality. - 表示部が、非補正映像信号を取り込んで非画質補正画像を表示する第１ステップと、
補正前画質特性取得部が、前記表示部が表示する前記非画質補正画像に基づいて補正前画質特性値を取得する第２ステップと、
目標画質特性取得部が、複数種類の目標画質特性値を記憶する目標画質特性記憶部から一種類の目標画質特性値を選択して取得する第３ステップと、
前記第２ステップにおいて前記補正前画質特性取得部が検出した前記補正前画質特性値と前記第３ステップにおいて前記目標画質特性取得部が取得した前記一種類の目標画質特性値とに基づいて映像信号を補正するための補正データを生成し、この補正データをルックアップテーブルに記憶領域を区分して書き込む第４ステップと、
を有することを特徴とする表示装置の校正方法。 A first step in which the display unit captures the non-corrected video signal and displays the non-image quality corrected image;
A second step in which a pre-correction image quality characteristic acquisition unit acquires a pre-correction image quality characteristic value based on the non-image quality correction image displayed by the display unit;
A third step in which a target image quality characteristic acquisition unit selects and acquires one type of target image quality characteristic value from a target image quality characteristic storage unit that stores a plurality of types of target image quality characteristic values;
A video signal based on the pre-correction image quality characteristic value detected by the pre-correction image quality characteristic acquisition unit in the second step and the one type of target image quality characteristic value acquired by the target image quality characteristic acquisition unit in the third step. Generating correction data for correcting the data, and writing the correction data in a lookup table by dividing the storage area;
A method for calibrating a display device, comprising:
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