JP2019095711A - Correction data generation device, display device, correction data generation method, and program - Google Patents

Abstract

To provide a correction data generation device for generating correction data on the basis of a target color characteristic value as target color characteristics, reference data as a reference and a colorimetric value of a display panel for achieving the target color characteristics on the display panel.SOLUTION: A correction data generation device for generating correction data of a display panel generates the correction data on the basis of a panel colorimetric value as a color value obtained by measuring a display color of the panel, a reference data characteristic value as a color value as a reference and a target color characteristic value as a color value to be reproduced on the display panel. In this case, extension data are obtained on the basis of a value calculated by interpolating the panel colorimetric value by linear interpolation and difference data calculated from the reference data characteristic value. Furthermore, the correction data are generated from the extension data and the target color characteristic value.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a correction data generation apparatus and the like.

  In recent years, applications such as signage and information display using a large screen display device have been expanded. In addition, systems capable of displaying a large screen with one display or configured as a multi-display by arranging a plurality of displays in a matrix form are increasing in number to have a large screen for display.

  In the case of a display using a liquid crystal panel, it has a configuration including a liquid crystal panel in which a liquid crystal substance is sealed between a pair of glass substrates, and a back light disposed on the back of the liquid crystal panel. An image is displayed by driving the liquid crystal panel according to an image signal supplied from an external device such as a device.

  In the liquid crystal display device, a gate driver and a source driver are mounted as a drive circuit of the liquid crystal panel, and the gate driver and the source driver are connected to the gate and source of a transistor for driving each pixel of the liquid crystal panel to input an image. It is determined by the electro-optical characteristics of the liquid crystal substance by controlling on / off of the transistor based on the signal and applying a voltage (input level to the liquid crystal panel) corresponding to the image signal to the transistor controlled to be on Change the light transmittance. Thus, the liquid crystal display device can display an image in gradation by controlling the amount of light emitted from the backlight and transmitted through the liquid crystal panel for each pixel.

  In the liquid crystal panel, the electro-optical characteristics of the liquid crystal substance are determined by the distance between the glass substrates in which the liquid crystal substance is sealed, so-called cell gap. And the light transmittance of the liquid crystal panel deviates from the design value, and a desired gradation characteristic may not be obtained.

  In addition, even in a system in which a plurality of displays are arranged in a matrix and configured as a multi-display and display is performed on a large screen, the display characteristics of the respective displays are not completely the same. The tone or color may be different.

  Therefore, techniques for suppressing unevenness in the display unit have been proposed. For example, for each of the first predetermined number of display colors, the reference data indicating the correspondence between the gradation data and the reference value is stored, and the correction data output includes less than the reference data and the first predetermined number. Obtaining correction data indicating a correction amount or correction value for each gradation data of the second predetermined number of display colors, for each pixel of the display unit, based on the colorimetric values of the second predetermined number of display colors; There is disclosed a technique for performing unevenness correction of a panel display unit (for example, Patent Document 1).

  In addition, a determination method is disclosed in which a test image is displayed for each display device to measure luminance and chromaticity, and based on the measurement result to determine an arrangement pattern that makes the display quality optimal (for example, Patent Document 2) .

JP, 2015-142352, A JP 2014-26120 A

  However, in the technology described in Patent Document 1, when using a panel having a large relative luminance difference between the central portion and the peripheral portion of the display surface or a display device in which color unevenness on the display surface is noticeable, the liquid crystal display device It is possible to correct luminance unevenness and color unevenness within a plane, but when a plurality of these display devices are arranged as a multi-display, the colors among the plurality of display panels are unified, and the dispersion between the planes is In order to suppress this, there is a problem that it takes time and effort, for example, photographing the display unit of the display device and requiring adjustment for optimal arrangement.

  Further, in the technology described in Patent Document 2, measurement and adjustment for each display device are required, and there is also a problem that it takes time and effort as well.

  In order to absorb individual differences among display panel characteristics and to achieve the target color reproduction characteristics with high accuracy, the color reproduction characteristics of the display panel are calculated using a three-dimensional look-up table (hereinafter referred to as 3DLUT). It is also conceivable to convert and realize target color reproduction characteristics with high precision. Also in this case, it is preferable to measure a large number of colors displayed by the display panel in order to understand the characteristics of the display panel. However, in the production process, the number of measurements is limited because of time constraints.

  In view of the problems described above, the present invention generates correction data for generating display panel correction data based on reference data serving as a reference and colorimetric values of the display panel in order to realize target color reproduction characteristics. It aims at providing an apparatus etc.

In order to solve the problems described above, the correction data generation device of the present invention is
In a correction data generation device for generating a correction data to be used when the display device corrects an input image signal and outputs it to a display panel,
A panel colorimetric value acquiring unit for acquiring a panel colorimetric value which is a color value obtained by measuring a display color of the display panel with respect to first gradation data;
A target color characteristic value which is a target color value in the display panel with respect to second gradation data, and a reference data characteristic which is a color value which is a reference of the display panel with respect to the second gradation data. A storage unit for storing values and
A correction data generation unit that generates the correction data based on the panel colorimetric value, the reference data characteristic value, and the target color characteristic value;
Equipped with
The correction data generation unit
First interpolation data corresponding to the second gradation data is calculated from the panel colorimetric value;
The difference between the reference data characteristic value and the second interpolation data calculated corresponding to the second gradation data by extracting the color value of the first gradation data from the reference data characteristic value Calculate some difference data,
The correction data is generated based on the extension data calculated based on the first interpolation data and the difference data, and the target color characteristic value.

The display device of the present invention is
A display panel, a correction data generation device for generating correction data for correcting an image signal according to the characteristics of the display panel, and correcting an input image signal based on the correction data, and performing display control on the display panel A display control device, comprising:
The display control device is characterized by comprising the correction data generation device.

The correction data generation method of the present invention is
In a correction data generation method, the display device generates correction data to be used when the input image signal is corrected and output to the display panel.
A panel colorimetric value acquiring step of acquiring a panel colorimetric value which is a color value obtained by measuring a display color of the display panel with respect to first gradation data;
A target color characteristic value which is a target color value in the display panel with respect to second gradation data, and a reference data characteristic which is a color value which is a reference of the display panel with respect to the second gradation data. Storing steps for storing values and
A correction data generation step of generating the correction data based on the panel colorimetric value, the reference data characteristic value, and the target color characteristic value;
Including
The correction data generation step is
First interpolation data corresponding to the second gradation data is calculated from the panel colorimetric value;
The difference between the reference data characteristic value and the second interpolation data calculated corresponding to the second gradation data by extracting the color value of the first gradation data from the reference data characteristic value Calculate some difference data,
The correction data is generated based on the extension data calculated based on the first interpolation data and the difference data, and the target color characteristic value.

The program of the present invention is
A computer that generates correction data to be used when the display device corrects the input image signal and outputs the corrected image signal to the display panel;
A panel colorimetric value acquiring function of acquiring a panel colorimetric value which is a color value obtained by measuring a display color of the display panel with respect to first gradation data;
A target color characteristic value which is a target color value in the display panel with respect to second gradation data, and a reference data characteristic which is a color value which is a reference of the display panel with respect to the second gradation data. Storage function to store values and
A correction data generation function of generating the correction data based on the panel colorimetric value, the reference data characteristic value, and the target color characteristic value;
To achieve
The correction data generation function is
First interpolation data corresponding to the second gradation data is calculated from the panel colorimetric value;
The difference between the reference data characteristic value and the second interpolation data calculated corresponding to the second gradation data by extracting the color value of the first gradation data from the reference data characteristic value Calculate some difference data,
The correction data is generated based on the extension data calculated based on the first interpolation data and the difference data, and the target color characteristic value.

  According to the present invention, the correction data for realizing the target color characteristic value is based on the extended data obtained from the interpolation data obtained by interpolating the panel colorimetric value and the difference data calculated using the reference data characteristic value. Can be generated.

It is a figure for demonstrating the basic composition of the display calibration system in 1st Embodiment. It is a figure for demonstrating the system block diagram in 1st Embodiment. It is an operation flow for explaining the flow of processing in the first embodiment. It is a figure for demonstrating the color characteristic matching data production | generation process in 1st Embodiment. It is a figure for demonstrating the grid number and gradation value in 1st Embodiment. It is an example of the data after extraction of the color corresponding to a panel colorimetric value from (a) reference data characteristic value in a 1st embodiment, and (b) reference data characteristic value. It is a figure for demonstrating the relationship of the measurement data and interpolation data in 1st Embodiment. It is an example of (a) reference data characteristic value in a 1st embodiment, (b) reference data characteristic value interpolation data, and (c) difference data. It is a figure for demonstrating the panel colorimetric value in 1st Embodiment. It is a figure for demonstrating the comparison with the panel colorimetric value interpolation data and panel colorimetric value expansion data in 1st Embodiment. It is a figure for demonstrating the data after 3DLUT correction | amendment in 1st Embodiment. It is a figure for demonstrating the color characteristic matching data production | generation process in 2nd Embodiment. It is a figure for demonstrating the color characteristic matching data production | generation process in 3rd Embodiment. It is an operation flow for explaining the flow of processing in the fourth embodiment. It is a figure for demonstrating the system configuration | structure figure in 4th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, as an example, a system including the correction data generation apparatus of the present invention will be described. In the display device according to the present embodiment, it is assumed that the in-plane color of the display panel is uniformly corrected in advance by the color unevenness correction process. The color unevenness correction process is performed, for example, using the method of Patent Document 1.

[1. First embodiment]
[1.1 Overall configuration]
First, the entire configuration of the display calibration system 1 of the present embodiment will be described based on FIG. As shown in FIG. 1, the display calibration system 1 includes a display device 10, a system control device 50 which is a correction data generation device, and a measuring device 60.

  The display device 10 is a device that outputs (displays) an image to the display unit 44 based on an image signal input from the interface 20. Here, the display unit 44 is one in which a display panel control device (controller) is connected to a display panel on which an image is displayed.

  The display panel control device is a device that controls the display panel. For example, it is a device that controls the brightness by controlling the backlight.

  Here, the display device 10 has different characteristics because there is a difference or a variation in the color gamut to be output for each display panel. Therefore, even if the same image signal is input to a display device of the same model, it is not always displayed in the same color.

  Therefore, the display device 10 has correction data, and it is possible to output a desired color by correcting the input image signal based on the correction data.

  Here, as a method of correcting the image signal, gamma correction for correcting the brightness, or a lookup table (hereinafter referred to as “LUT”) for converting the gradation to be output to the inputted gradation is used. There is something to correct.

  The LUT is a table in which pre-computed results are stored. The display device maps the input image signal (for example, an input signal of 8 bits of each color of RGB) using the LUT, and calculates an output signal suitable for the display panel. Thereby, the variation of the display panel is corrected.

  Further, as a correction method using the LUT, there is a method of correcting using a three-dimensional LUT (hereinafter referred to as “3DLUT”) expressed in three dimensions separately from the method using the LUT of each color of RGB. The use of the 3DLUT improves the color reproducibility of RGB because it has intermediate tone points. Hereinafter, in the present embodiment, a case where 3DLUT data is used as correction data for correcting an image signal will be described.

  The system control device 50 is a device that generates correction data. In addition, the display device 10 and the measuring device 60 may display a test image on the display unit 44 of the display device 10, transmit a measurement request signal to the measuring device 60, and receive a measurement result from the measuring device 60. Is a device to realize cooperation with For example, it is realized by an information processing apparatus such as a computer or a tablet.

  The measuring device 60 is a measuring device equipped with input and output terminals such as USB and RS232C terminals to perform color measurement. The measuring device 60 measures (colors) the test image (display color) displayed on the display unit 44 based on the measurement request signal from the system control device 50, and the system control device 50 measures a color value as a measurement result. Send to Specifically, the measuring device 60 captures a test image displayed on the display screen of the display unit 44, and the measured values (for example, measured values such as XYZ values) of each pixel of the measuring device 60 obtained by this capturing Output as measurement data. As the measuring instrument 60, a surface luminance meter such as a luminance / chromaticity measuring device or a two-dimensional color luminance meter, a color luminance meter, a high definition digital camera, an industrial camera or the like can be used.

  In addition, the measuring device 60 may have a difference in performance for every measuring device. This difference in performance may cause an error in each measuring instrument. In that case, it is preferable to set a standard of an allowable error and to measure color using a measuring instrument (reference measuring instrument) that satisfies the standard or a substitute of the reference measuring instrument.

[1.2 Functional configuration]
[1.2.1 Display Device]
Subsequently, the configuration of the display device 10 will be described with reference to FIG. The display device 10 includes an interface 20, a control unit 30, a storage unit 41, a power supply unit 42, an operation unit 43, and a display unit 44.

  The interface 20 is a functional unit that transmits / receives data to / from an external device (for example, a display control device such as a computer) according to an instruction from the general control unit 31 of the control unit. In this embodiment, a Digital Visual Interface (DVI) terminal 21 for serial communication in Transition Minimized Differential Signaling (TMDS) method, a High-Definition Multimedia Interface (HDMI) terminal 22, and a Transmission Control protocol (TCP). Or the LAN terminal 23 and RS232C terminal 24 for communicating by communication protocols, such as UDP (User Datagram Protocol), are provided. In addition to this, a Display Port terminal, a USB terminal, an IEEE 1394 terminal, or the like may be provided.

  The control unit (signal processing unit) 30 is a computer or control circuit that controls the display device 10, and the general control unit 31, the video data processing unit 32, the audio signal processing unit 33, the panel controller 34, and mode setting The functions of the unit 35 and the color characteristic matching data processing unit 36 are realized.

  The overall control unit 31 is a block that controls the entire hardware of the display device 10. The video data processing unit 32 is a block that performs predetermined processing on the video data when video data (data of video to be displayed on the display unit 44) is input from the system control device 50 via the interface 20. The audio signal processing unit 33 is a block that performs predetermined processing on an audio signal (a signal of audio output from the speaker of the display unit 44) input from the system control device 50 via the interface 20.

  The panel controller 34 controls the display unit 44 to display the video of the video data processed by the video data processing unit 32 on the display unit 44. Further, when the panel controller 34 receives a test image display instruction from the system control apparatus 50, the panel controller 34 causes the display unit 44 to display a test image for generating color characteristic matching data.

  The mode setting unit 35 is a functional unit for switching between a plurality of types of 3DLUT data (correction data) stored in a storage unit 41 described later. In the present embodiment, the display device 10 stores a plurality of 3DLUT data in the storage unit 41. For example, when the user selects a mode such as a normal mode that can reproduce the color gamut of panel display characteristics as wide as possible, or a sRGB mode that realizes a known sRGB color gamut, the corresponding 3DLUT data is selected.

  In addition, 3DLUT data corresponding to a mode for emphasizing a specific gradation (for example, a medical mode) or a mode for emphasizing a specific place (multi-setting compatible mode) may be settable. The display device 10 uses 3DLUT data corresponding to the selected mode as a 3DLUT described later.

  Although a plurality of these 3DLUT data are described as being stored, only one may be stored. Also, it may be possible for the user to add it later.

  The color characteristic matching data processing unit 36 selects 3DLUT data to be used from the stored 3DLUT data, and sets it in the 3DLUT.

  When the input video data is displayed on the display unit 44, color characteristic conversion by 3DLUT is performed and displayed. In color conversion by 3DLUT, color conversion is performed using data developed by performing generally known octahedron interpolation and tetrahedron interpolation on data between grids.

  The storage unit 41 is an information storage device such as a semiconductor memory or a magnetic disk, and stores various data handled by the control unit 30 and data specific to each display device 10 such as 3DLUT data.

  In particular, when 3DLUT data used at the time of matching data application is generated by the color characteristic matching data generation processing unit 53 of the system control apparatus 50, the storage unit 41 stores these 3DLUT data.

  The power supply unit 42 is a functional unit that controls power supplied from the outside. The overall control unit 31 causes the power supply unit 42 to supply power or cut off the supply of power according to an operation instruction input from a power switch (not shown) of the operation unit 43. When the operation instruction input from the power switch is an operation instruction to switch to power on, the power is supplied to each hardware of the display device 10, and the operation instruction input from the power switch is an operation instruction to switch to power off , And the power supplied to each hardware of the display device 10 is shut off.

  The operation unit 43 is an operation unit for the user to input various instructions. For example, it is comprised by hardware switches, such as a power switch and a button. In addition, various instructions may be input by OSD (On-Screen Display), or may be configured by a software switch that can be operated by touch or the like.

  The display unit 44 is, for example, a liquid crystal display (LCD), and displays an image under the control of the panel controller 34.

[1.2.2 System Controller]
Subsequently, the configuration of the system control device 50 will be described with reference to FIG. The system control apparatus 50 includes a control unit 51, an interface 52, a color characteristic matching data generation processing unit 53, and a storage unit 54.

  The control unit 51 is a functional unit for controlling the entire system control apparatus 50. The control unit 51 realizes various functions by reading and executing various programs stored in the storage unit 54, and is configured by, for example, a CPU (Central Processing Unit) or the like.

  The interface 52 is a functional unit that transmits and receives data to and from an external device (for example, the display device 10 or the measuring device 60) according to an instruction from the control unit 51. The interface 52 is provided with, for example, a DVI terminal, an HDMI terminal, a Display Port terminal, and the like as an interface for transmitting video data to the display device 10. In addition, an RS232C terminal, a USB terminal, an IEEE1394 terminal, and the like for transmitting and receiving data to and from the display device 10 and the measuring device 60, and a LAN terminal for communicating with a communication protocol such as TCP or UDP are provided.

  The color characteristic matching data generation processing unit 53 acquires color characteristics at a designated gradation of the display unit 44 of the display device 10, and generates 3DLUT data so as to match the color of the target color reproduction characteristic. The generated 3DLUT data is transferred to the display device 10 via the interface 52 and stored in the storage unit 41. Details of the color characteristic matching data generation process executed by the color characteristic matching data generation processing unit 53 will be described later.

  The storage unit 54 is a functional unit in which various programs necessary for the operation of the system control apparatus 50 and various data are stored. The storage unit 54 is configured of, for example, a semiconductor memory, a hard disk drive (HDD), or the like.

  In particular, in the storage unit 54, the color characteristic matching data generation processing unit 53 stores data commonly used in all the display devices 10 of the same model.

Here, the same model means a display device in the following case.
(1) Display device of the same model number, display device of the same series It is an apparatus of the same model number and the same series as a display device. This is because, in the case of the same model number or the like, the display characteristics tend to have the same tendency.
(2) Display Device Using Display Panels of the Same Manufacturer Even display devices of the same model number may use different display panels. In such a case, display panels of the same manufacturer and system are referred to as the same model. This is because the display characteristics tend to be the same for each display panel.
(3) Display devices manufactured at the same manufacturing line and at the same time as the manufacturing time of the same period The same display panel is used in the same manufacturing line, or the display characteristics become close due to the production facility .
These conditions may be combined.

  As data stored in the storage unit 54, reference data characteristic values and target color characteristic values are included. The reference data characteristic value selects one or a plurality of display devices 10 serving as a reference from a large number of display devices 10 of the same type, and uses the measuring device 60 to select the number of gradations required as reference data. It is the data which measured and was created based on the measurement result. The target color characteristic value is data created based on the target color reproduction characteristic of the same model.

  Next, the color characteristic matching data generation processing unit 53 shown in FIG. 1 will be described. The color characteristic matching data generation processing unit 53 receives the measurement data obtained by the measurement after the measurement of the test image displayed on the display unit 44 is performed by the measuring device 60, and the color is determined based on the measurement data. Perform characteristic matching data generation processing. In the following description, data obtained from one test image is taken as one measurement data. That is, one measurement data is data of a central portion in the display surface obtained by capturing one test image, and is a measurement value (XYZ value) obtained by the measuring device 60.

  The target color characteristic value is a color characteristic value to be targeted (which is supposed to be displayed). Target color characteristic values are prepared for each of a plurality of modes, such as for the normal mode created so as to reproduce the color gamut of the display characteristics of the display panel as wide as possible, and for the sRGB mode for realizing a known color reproduction range of sRGB. May be

  The color characteristic matching data generation processing unit 53 generates correction data (3DLUT data) according to the color reproduction characteristic of the display panel based on the target color characteristic value. The correction data generated by the color characteristic matching data generation processing unit 53 is output to the storage unit 41 of the display device 10 and stored. In the display device 10, when displaying an image on the display unit 44 (display panel), the control unit 30 (mode setting unit 35) properly corrects the color of the image or the like to be output based on the correction data. Note that the correction data is switched by switching the mode according to the user's intention according to, for example, the image to be displayed and the usage environment of the display device. This makes it possible to display color output according to the user's intention.

  When a color characteristic matching data generation processing instruction is input to the display calibration system 1 constituting the display device 10 in which the color characteristic matching data generation processing is performed, the system control device 50 transmits a test image display instruction to the display device 10 Thus, the test image is displayed on the display unit 44, and the measurement device 60 is caused to measure the test image to output measurement data. The system control device 50 receives measurement data from the measuring device 60 and temporarily stores it in the storage unit 54. Subsequently, the measurement data stored in the storage unit 54 is input to the color characteristic matching data generation processing unit 53. Further, the color characteristic matching data generation processing unit 53 obtains 3DLUT data, transfers the 3DLUT data to the display device 10, and writes the 3DLUT data to the 3DLUT by the color characteristic matching data processing unit 36, thereby turning the color characteristic matching data into an operating state. Do.

  To measure the display unit 44, install a tool (application) that enables data exchange with the measuring device 60 in the system control device 50, and connect the measuring device 60 with, for example, USB or LAN. Do. Here, after the system control apparatus 50 displays a test image to be measured on the display unit 44, the measurer may measure in the measuring instrument 60 and store measurement data sequentially. However, there are a plurality of test images (one hundred and several dozen gradations), and if the display and photographing operation instructions are repeated as many as the required test images, it takes time and is difficult, and there is a possibility of erroneous operation. Therefore, the system control device 50 may control the display unit 44 and the measuring device 60 to automatically perform a series of operations of “image display”, “measurement”, “storage of measurement data”, and “change of image”.

  Further, setting of measurement conditions (shutter speed, aperture, focus, number of times of measurement, etc. when imaging with a camera) and data management (data storage) and the like of the measuring instrument 60 can be efficiently performed by the system controller 50.

[1.3 System Configuration]
FIG. 2 shows a system configuration of the present invention. The present system includes a display panel (display unit 44 of the display device 10) to be subjected to color calibration, and a measuring instrument that displays and captures a test image, and measures (colorimetry) each pixel from the captured test image. 60 and system controller 50 which is a computer for data processing. In addition, although the measuring device 60 has shown the example of a non-contact-type colorimeter, it can be implemented similarly by a contact-type colorimeter.

  In each display 10, color measurement is performed to perform color characteristic matching at the time of factory shipment. In addition, 3DLUT data in accordance with the characteristics of the display device 10 is generated by generating 3DLUT data for each mode based on the measured data.

The arrows in the system configuration diagram of FIG. 2 indicate the execution steps from the system controller and are processed in the following order.
(1) The system control device 50 controls the display device 10 (2) The system control device 50 displays a test image on the display unit 44 (target panel) of the display device 10 (3) The system control device 50 controls the measuring device 60 (4) Taking a test image displayed on the display unit 44 (5) The system control device 50 acquires measurement data (color data (XYZ)) (6) The system control device 50 acquires the acquired measurement data from the display device 10 (7) The system control device 50 transfers the color characteristic matching data (3DLUT data) to the 3DLUT of the display device 10 and sets the color characteristic matching data (3DLUT data).

  A color pattern is stored in the display device 10 as an internal pattern, and the system control device 50 causes the display unit 44 (target panel) to display the color pattern instead of displaying the test image in the process (2) described above. The control may be performed by the system control device 50.

[1.4 Process flow]
[1.4.1 Overall flow]
The flow of processing in the present embodiment will be described with reference to FIG. The process of FIG. 3 is a process executed by the system controller 50. The display device 10 which is a generation target of 3DLUT data and which is a display calibration target is hereinafter referred to as a target display device.

  First, the system control device 50 (control unit 51) acquires the identification number of the target display device (for example, the model number, the identification information for identifying the series, the serial number, etc.) (step S102). Subsequently, the control unit 51 initializes 3DLUT data (correction data) stored in the panel body of the target display device. Thereby, the 3DLUT data is set to unadjusted data (step S104), and measurement is started in this state.

  For example, in the case of a 3D LUT of 8-bit gradations, RGB values of 729 colors consisting of a combination of 9 gradations of 0, 32, 64, 96, 128, 160, 192, 224, and 255 are set as initial values. The combination of gradations set in the 3DLUT is referred to as second gradation data in the present embodiment. Here, the number of colors of the second gradation data is 729 colors.

  Subsequently, a loop counter indicating the number of times of color characteristic matching data generation processing is set to "0" as an initial value (step S106). The number of times of processing is set to a maximum of 3 times (not limited to this). Then, it is determined whether or not the loop counter is less than "3", and if less than "3", the next step, N color measurement, is performed. N color measurement is performed to obtain a panel colorimetric value (step S108; Yes → step S110).

  The measurement is performed by displaying the test image on the target display device and measuring the color of the central portion of the display surface with the measuring device 60. The measuring device 60 acquires tristimulus values XYZ values defined in the CIE XYZ colorimetric system as in-plane central data (data of the display unit) of the display device 10, and transfers them to a data processing PC. This measurement process is performed on a plurality of colors (N: N is a natural number, for example, N is 125) while switching the colors of the test image displayed on the display unit 44 of the display device 10. Here, it is assumed that the color of the test image is a part of the second gradation data, and the gradation indicating the color of the test image is referred to as first gradation data in the present embodiment. Here, the number of colors of the first gradation data is 125. Further, the number of colors measured by the measuring device 60 with respect to the target display device is referred to as the number of measured colors.

  Subsequently, color characteristic matching data generation processing is executed based on the measured data XYZ values (panel colorimetric values) of the display unit 44 in each of the measured colors (step S112). This processing makes the color reproduction characteristics of the display surface match the color reproduction characteristics of the target value using reference data characteristic values determined in advance reflecting the characteristics of the display device 10 from XYZ values of a plurality of colors. Color characteristic matching data, which is a correction value of the RGB 3DLUT, is obtained. Details of the color characteristic matching data generation process will be described later.

  Also, since differential data including variations of the display device 10 has already been obtained by measurement, it is similarly switched to another target value XYZ file, and for another mode to match the color reproduction characteristics of this target value. The 3D LUT correction values of RGB can also be determined continuously.

  Furthermore, the system control apparatus 50 executes matching correction (step S104). Specifically, the data of the generated color characteristic matching correction value is output to the display device 10 (target display device) corresponding to the identification number input in step S102. The display device 10 receives the data of the color characteristic matching correction value, and stores it as 3DLUT data. Thereafter, the 3DLUT is set based on the stored 3DLUT data.

  By this processing, the generated 3DLUT data is set in the target display device, and the color characteristic matching data set in the 3DLUT is in the operating state. The display of the target display device is in a state after calibration where correction by color characteristic matching data is applied through the 3DLUT.

  In this state, it is evaluated and determined whether the generated 3DLUT data satisfies the color reproduction characteristic of the target value. Specifically, a plurality of colors (M: M is a natural number; for example, M is 30) are displayed in order by the next M color measurement step, and each measurement is performed (step S116). In the present embodiment, for the M color, five gradations are selected on each color axis of R, G, B, C, M, and Y, and 6 colors × 5 gradations = 30 colors. It is not limited to.

  First, CIE 1976 L * a * b * data (CIE: Commission Internationale de l'Eclairage: International Commission on Illumination. L *: Lightness, respectively) of measured XYZ values of M color and target value data XYZ values in the corresponding gradation. , A *, b *: chromaticity). Subsequently, the color difference Delta E as a difference and the XYZ value are converted into xy chromaticity, and the difference value on the chromaticity diagram is obtained. Whether the determined value satisfies the inspection criteria (color difference 3.0 or less, chromaticity difference dx = 0.005 or less, dy = 0.005 or less, etc.) set in advance for all the M colors for judgment An evaluation determination is made (step S118).

  If the inspection standard is satisfied, the color characteristic matching data generation process ends (step S120; Yes). If the standard is not satisfied, the loop counter indicating the number of times of 3DLUT data generation processing is increased by one (step S120; No → step S122), and if the loop counter is within the maximum value setting 3, N color measurement is performed again (data The process returns to the procedure (step S108; Yes → step S110), and thereafter, processing from generation of color characteristic matching data is executed in the same manner.

  In the color characteristic matching data generation process again, 3DLUT data is generated by adding the additional correction amount obtained in the current remeasurement routine to the 3DLUT data generated in the previous process. It is also good. That is, in the remeasurement, the 3DLUT data generated in the previous process is applied to the target display device.

  That is, the generated color characteristic matching data may be used instead of the reference data characteristic value. Thus, more appropriate calibration can be performed by adding the color characteristics based on the data once measured.

  In such a state, when the measured XYZ value becomes the same value as the target color characteristic value XYZ value, the 3DLUT data output by remeasurement has the same value as the 3DLUT data generated in the previous process. You may maintain it. If there is a difference that the green is light and the green is dark with respect to the target color, the 3DLUT data having the difference is additionally corrected from the 3DLUT data generated in the previous process.

  The regenerated 3DLUT data is set, the evaluation color is judged, and if all the colors for evaluation satisfy the inspection standard, this processing ends, and the 3DLUT correction storing the above correction value meeting the inspection standard The table is stored in the storage unit 41 of each display device 10.

[1.4.2 Color characteristic matching data generation process]
The color characteristic matching data generation process will be described with reference to FIG. The color characteristic matching data generation process is a process performed by the color characteristic matching data generation processing unit 53.

The color characteristic matching data generation processing unit 53 outputs correction value data to be finally 3DLUT setting data indicating RGB-RGB conversion based on the input of the following data in consideration of the color reproduction characteristics of the panel.
(1) Target color characteristic value (input 1) indicating the color characteristic relational expression (RGB-XYZ) to be reproduced, which is prepared in advance
(2) From the color reproduction characteristic variations of the plurality of display devices 10, select the reference panel which is at the center value of the variation range as much as possible, and measure the color characteristic relational expression (RGB-XYZ) Reference data characteristic value indicated (input 2)
(3) In the system configuration diagram of FIG. 2, a panel colorimetric value (input 3) indicating a color characteristic relational expression (RGB-XYZ) obtained by measuring a plurality of colors for the target panel in the production process.

  Here, as shown in FIG. 5A, in the case of an 8-bit value, the 5 × 5 × 5 grid configuration is a combination of five gradations of which the gradation value is (0, 64, 128, 192, 255) Represents the three-dimensional gradation data (first gradation data, 125 colors) configured by and, as shown in FIG. 5B, the 9 × 9 × 9 grid configuration has gradation values of It represents three-dimensional gradation data (second gradation data, 729 colors) constituted by a combination of nine gradations of 0, 32, 64, 96, 128, 160, 192, 224 and 255).

  Data of Input 1 is target color characteristic values created in advance, and is data of color values corresponding to the second gradation data corresponding to 3DLUT data of a 9 × 9 × 9 grid configuration. The target color characteristic values are RGB-XYZ data of 729 colors having the same configuration as the reference data characteristic values shown in FIG. 6A, and target color reproduction characteristics are created in advance with 729 colors of XYZ values.

  The data of input 2 is a reference data characteristic value created in advance, and as shown in FIG. 6A, corresponds to the second gradation data corresponding to the 3DLUT data of the 9 × 9 × 9 grid configuration. It is data of color value. As shown in FIG. 6 (b), the data processing of input 2 first begins with the reference data characteristic value, and as shown in FIG. 6 (b), the gradation (first gradation data) corresponding to the Extract 125 color data that matches the combination. Subsequently, a value between the grid and the grid (between grids), that is, the color value for the tone which is not included in the first tone data but is included only in the second tone data is determined by linear interpolation, 9 Create 729 color interpolation data of × 9 × 9 grid configuration (input 2a).

  Here, FIG. 7 is a diagram showing the relationship between measurement data and interpolation data. In FIG. 7, points indicated by US marks are actual measurement points actually measured by the measuring device 60, and points indicated by triangles are points obtained by linear interpolation. FIG. 7 shows a part of points obtained by linear interpolation. Here, the actual measurement points are 125 colors of 5 × 5 × 5 grid configuration. Further, grid data located between the grids of each of the measurement points is obtained by interpolation calculation, and expanded to 3DLUT data of a 9 × 9 × 9 grid configuration.

Furthermore, from the data of 729 colors (input 2a) created using this linear interpolation and the reference data characteristic value (input 2) holding the data of 729 colors without interpolation, the input is made from input 2a Difference data (729 colors) is obtained by subtracting 2.
Difference data (input 2b)
= Reference data characteristic value interpolation data (input 2a)-reference data characteristic value (input 2)

  A specific example will be described with reference to FIG. FIG. 8A shows reference data characteristic values (input 2). Further, FIG. 8 (b) is a reference data obtained by extracting data of 125 colors corresponding to the combination of gradations corresponding to the 5 × 5 × 5 grid configuration 3DLUT data from the reference data characteristic value and performing linear interpolation. Characteristic value interpolation data. Further, FIG. 8 (c) is difference data obtained by subtracting the reference data characteristic value (FIG. 8 (a)) from the reference data characteristic value interpolation data (FIG. 8 (b)).

  As the difference data, as shown in FIG. 8C, the 125 colors matching the 5 × 5 × 5 grid configuration have the same value, so the difference data on these grids is always 0, but other than that On the grid, difference values occur. This shows the difference characteristic between the interpolation characteristic by linear interpolation and the actual panel display characteristic and the actual measurement value. This difference characteristic is used after linear interpolation in data processing of panel colorimetric value (input 3) described below.

  The flow of data processing of input 3 is as follows. First, 3DLUT data of 5 × 5 × 5 grid configuration is created in the target display device. Specifically, a test image corresponding to the gradation (first gradation data) in each of the 5 × 5 × 5 grids is displayed on the display unit 44, and the color is measured by the measuring device 60. The number of colors included in the 5 × 5 × 5 grid is 125. Therefore, the color measurement number of this embodiment is 125.

  FIG. 9 shows an example of panel colorimetric values obtained by measuring 125 colors corresponding to 3DLUT data of 5 × 5 × 5 grid configuration in a production process. This value is a value obtained by using the measuring device 60 to display the test image on the panel of the target display device. Subsequently, these data are expanded into data of 729 colors by linear interpolation (input 3a). This is called panel colorimetric value interpolation data (interpolation data).

  In order to obtain the characteristic information of the panel with variation accurately, it is desirable to measure the measurement data XYZ value of 729 colors originally, but in the production process, the number of colors measured is 729 colors due to the restriction of measurement time There are also 125 colors with a fairly small number of colors.

Furthermore, the panel colorimetry of 729 colors corresponding to the 3DLUT data of 9 × 9 × 9 grid configuration is obtained by subtracting the difference data (input 2b) obtained by expanding the input 2 from the panel colorimetric value interpolation data. Update as value extension data (extension data). This is a process performed to compensate for the difference between the interpolation calculation and the actual measurement value. The panel colorimetric value expansion data is obtained by the following equation.
Panel colorimetric value expansion data (input 3b)
= Panel colorimetric value interpolation data (input 3a)-difference data (input 2b)

  After interpolation development of 125 actual values to 729 colors by linear interpolation, values on grids that are not actually measured are recorrected using linear interpolation data and difference data representing the difference between panel characteristics to improve accuracy. Thus, the interpolation accuracy of 729 colors can be obtained from simple linear interpolation as interpolation data corrected to colorimetric values closer to the display characteristics of the actual panel.

  This means that it is possible to obtain values with accuracy close to the XYZ values that can be obtained when measuring 729 colors in the production process, and with these methods it is a small number of measurements in the production process etc. Even in this case, accurate measurement values close to the measurement data of 729 colors can be obtained, which leads to improvement of conversion accuracy in the next data conversion process.

  FIG. 10 shows a graph in which the gray scale level is taken along the horizontal axis and the Y value among the XYZ values is taken along the vertical axis for panel colorimetric value interpolation data and panel colorimetric value interpolation data in the present embodiment. In the graph, the points indicated by black points are values (panel colorimetric values) when the target display device is measured by the measuring device 60. Specifically, the gradation level is 0, 64, 128, 192, It is five points of 255. Further, since the XYZ values at the gradation levels of 32, 96, 160, and 224 are not measured, linear interpolation is performed. The Y values obtained by linear interpolation are represented by diamond points. Further, a line connecting a black point and a diamond point is represented by a broken line, and the value of the point connected by the broken line is the panel colorimetric value interpolation data.

  Here, a point obtained by subtracting the difference data from the panel colorimetric value interpolation data is represented by a square point. Further, a line connecting a black point and a square point is represented by a solid line, and the value of the point connected by this practice is the panel colorimetric value extension data. In the example of FIG. 10, the Y value of the panel colorimetric value extension data is lower than that of the panel colorimetric value interpolation data, and the shape of the graph is smooth.

  Finally, using the two data of the target color characteristic value (input 1) and the panel colorimetric value extension data (input 3b), the data conversion process of FIG. 4 is performed. In the data conversion process, first, the three-dimensional space in the panel colorimetric value expansion data is sequentially searched, and grid points close to the set target color characteristic value data are extracted. Subsequently, the distance from the grid point is calculated, an RGB value proportional to the size of the distance is determined, and finally an RGB value capable of realizing a value closest to the target color characteristic value XYZ is obtained. The output value is calculated for each 729 colors. The calculated value becomes 3DLUT data (RGB-RGB) output by the color characteristic matching data generation processing unit 53.

  The flow of the above-described processing will be specifically described. In FIG. 9, since the XYZ values at R = 0, G = 0, and B = 32 are not measured, the XYZ values are obtained by linear interpolation, and the values of difference data are further reduced to calculate extended data. For example, it is assumed that values of X = 2.431, Y = 1.0, and Z = 14.3 are obtained as extended data.

  Subsequently, from the grid of the target color characteristic value, the grid closest to the value of the extension data is searched. Here, it is assumed that the grid of (0, 0, 1) of the target color characteristic value, that is, R = 0, G = 0, B = 32 is the closest grid. At this time, among the XYZ values in the grid of (0, 0, 1) of the target color characteristic value, when the value of Z is 24, the interpolation coefficient is (24-14.3) / (48. 1-14) .3) = 0.287. Further, the value of B of RGB at this time is obtained as 32 × 0.287 + 32 ≒ 41. Similarly, the values of R and G are zero. Therefore, in the target display device, when R = 0, G = 0 and B = 41 are output with respect to the inputs of R = 0, G = 0 and B = 32, display close to the target color characteristic value is possible. Become.

  FIG. 11 shows an example of data after 3DLUT correction. 3DLUT data of RGB values having correction values for 729 colors in a 9 × 9 × 9 grid configuration is output.

  According to this method, in-plane color unevenness correction is performed, and setting is performed on a panel in which color uniformity correction in the display surface of the display device 10 is performed while absorbing individual differences among individual displays. It is possible to accurately generate 3DLUT data for making it close to the target value characteristic, and to calibrate the display of the display device 10.

  In addition, it is possible to reduce individual differences and variations in color between display surfaces by realizing high color reproducibility with respect to a target by color management by 3DLUT to which the generated 3DLUT data is applied. Further, by adjusting to a common target value characteristic, in the case of a multi-display configuration, high-quality display with a sense of unity can be achieved over the entire multi-display without adjustment at the time of installation and introduction.

  The display device 10 may be equipped with the 3DLUT by generating 3DLUT data by the system control device 50. Furthermore, when 3DLUT data is generated for a plurality of display devices 10 of the same model, reference data characteristic values and target color characteristic values stored in the storage unit 54 can be repeatedly used, which is efficient.

  Furthermore, by transferring the 3DLUT data generated by the system control device 50 in the present embodiment, the display device 10 having the display panel whose characteristics are corrected may be produced.

  When the display device 10 having the display panel whose characteristics are already corrected is recalibrated, for example, to cope with aged deterioration, 3DLUT data already set in the display device 10 instead of the reference data characteristic value. The measurement value may be corrected using

  Specifically, the 3DLUT data is recreated using an information processing apparatus (for example, a notebook PC or the like) installed with an application having the same behavior as the system control apparatus 50 and a measuring instrument at the site where the display apparatus 10 is installed. And set. For example, when a plurality of display devices 10 are installed, a new common target value characteristic satisfying the color gamut of the installed display device 10 is created as a target color characteristic value in order to suppress variations between display surfaces. Do. Further, the correction of the measurement value is performed by the information processing apparatus downloading the already set 3DLUT data to each display device 10, associating the 3DLUT data with the measurement value, and performing the correction on the application side.

  By correcting the measurement value based on the 3DLUT data set in the display device 10, it becomes possible to generate 3DLUT data with high accuracy. Further, with regard to re-correction in the field where aging deterioration is assumed, it is possible to cope with even an information processing apparatus in which an application having the same behavior as the system control apparatus 50 is installed.

[2. Second embodiment]
Subsequently, the second embodiment will be described. The second embodiment has the same configuration as the first embodiment, but replaces the color characteristic matching data generation process from FIG. 4 to FIG. The present embodiment differs in that 19 colors are added. That is, this embodiment is an embodiment in which a color for measuring a panel is added, interpolation is performed, and correction with difference data is performed, and then interpolation data is overwritten with actual measurement value data.

  The first embodiment is an example in the case where there is a restriction on the number of colorimetry in the production process, but in the environment where measurement can be performed faster and more accurately by improving the performance of the measuring instrument, panel measurement It is also possible to partially add the color of the color.

  For example, in dark colors such as dark areas, variations due to measurement errors tend to increase. Here, the second tone data includes 27 ways composed of combinations of 0, 32, and 64 tones which are interpolation colors in the dark area. Among these, points other than the eight points (which are included in the first gradation data) that are usually measured correspond to the grid calculated by interpolation.

Therefore, the following 19 colors, which are gradations included only in the second gradation data, are added to the panel colorimetric value to make the panel measurement 144 colors (125 + 19 colors), and the dark part is the actually measured value To generate 3DLUT data.
RGB = (0, 0, 32), (0, 32, 0), (0, 32, 32),
(0, 32, 64), (0, 64, 32), (32, 0, 0),
(32, 0, 32), (32, 0, 64), (32, 32, 0),
(32, 32, 32), (32, 32, 64), (32, 64, 0),
(32, 64, 32), (32, 64, 64), (64, 0, 32),
(64, 32, 0), (64, 32, 32), (64, 32, 64),
(64, 64, 32)

  The processing procedure of this embodiment is almost the same as the color characteristic matching data generation processing of the first embodiment, but in the color characteristic matching data generation flow of FIG. 12, the panel colorimetric value (input 3) is interpolated (input 3a) After the correction (input 3b), only the grid values corresponding to the above 19 colors are replaced with the measured XYZ values (input 3c).

  By the process described above, not the interpolation value but the actually measured value can be used, and the accuracy improvement of the color characteristic XYZ value indicating the panel characteristic value can be realized. The color combination and the number of colors to be additionally measured are not limited to these, and the additional measurement color may be freely determined and set in the system in advance.

[3. Third embodiment]
Subsequently, the third embodiment will be described. The third embodiment has the same configuration as the first embodiment, but replaces the second and subsequent color characteristic matching data generation processing from FIG. 4 to FIG. The present embodiment is different in that in the second and subsequent color characteristic matching data generation processing, not the reference data characteristic value but the target value identification value is input as the input 2.

  If the criterion is not satisfied in the first determination of the processing result, color characteristic matching data is generated based on the panel colorimetric value that can be acquired by measuring the panel again, and matching correction is performed (re-correction (Re-correction) Processing) In the re-correction processing, measurement is started in a state where 3DLUT data generated in the first correction is applied to the panel. For this reason, the panel characteristics are already in a state very close to the target value characteristics.

  Therefore, when developing the panel colorimetric value of 125 colors measured in this state to 729 colors, the target color characteristic value is used instead of creating difference data using the reference data characteristic value initially used. It is more desirable to create difference data. Therefore, in the present embodiment, in the color characteristic matching data generation flow in the recorrection process, the input 2 uses the same target color characteristic value as the input 1.

  The specific process flow is shown in FIG. The same processing as that of the first embodiment is denoted by the same reference numeral, and the description thereof is omitted. After N color measurement is performed on the target display device (step S110), it is determined whether the value of the loop counter (L) is 0 or not (step S302). If L = 0, this is the first correction, and color characteristic matching data generation processing is executed using input 2 as a reference data characteristic value to generate color characteristic matching data (step S302; Yes → step S304). When L is not 0, this is re-correction processing, and color characteristic matching data generation processing is executed with input 2 as the target color characteristic value to generate color characteristic matching data (step S302; No → step S306).

  As described above, measurement interpolation data with higher accuracy can be generated also in the re-correction process, and the accuracy of the color characteristic matching data is improved.

  At this time, the system control device 50 may read 3DLUT data from the display device 10. By using data based on the read 3DLUT data instead of the reference data characteristic value, more appropriate calibration can be performed.

[4. Fourth embodiment]
Subsequently, the fourth embodiment will be described. The fourth embodiment is an embodiment in which the display device 12 generates 3DLUT data instead of generating 3DLUT data by the system control device 50.

  The display device 12 in the present embodiment further includes a color characteristic matching data generation processing unit in addition to the functional configuration of the display device 10 shown in the first embodiment. Further, the storage unit 41 of the display device 12 in the present embodiment includes the reference data characteristic value and the target color characteristic value.

Further, in this embodiment, the system configuration of the first embodiment is replaced with FIG. 2 to FIG. The arrows in the system configuration diagram indicate the execution steps from the system controller, and this embodiment is processed in the following order.
(1) The system control device 50 controls the display device 12 (2) The system control device 50 displays a test image on the display unit 44 (target panel) of the display device 12 (3) The system control device 50 controls the measuring device 60 (4) The test image displayed on the display unit 44 is taken (5) The system control device 50 obtains measurement data (color data (XYZ)) (6) The system control device 50 takes measurement data (color data (XYZ) ) To the display unit 12 (7) The display unit 12 generates 3DLUT data based on the measurement data (color data (XYZ))

  As in the first embodiment, instead of causing the system control device 50 to display a test image in (2), a color pattern is stored in the display device 12 as an internal pattern, and the color is displayed in the display unit 44 (target panel). The system control device 50 may perform control to display a pattern.

  The flow of the process is substantially the same as the process of the first embodiment shown in FIG. 3, but the input of the identification number of the panel to be measured (step S102) is unnecessary. Further, the present embodiment is different in that color characteristic matching data generation (step S112) and evaluation determination (step S118) are executed by the display device 12.

  Although FIG. 15 describes that the system control device 50 transfers the measurement data of the measuring device 60 to the display device 12, the display device 12 may be able to directly receive the measurement data of the measuring device 60.

  According to the present embodiment, since the display device 12 includes the color characteristic matching data generation processing unit, the display calibration can be performed only by the display device 12 if data necessary for generating 3DLUT data is input.

[5. Fifth embodiment]
In the fifth embodiment, a plurality of display devices 10 having display panels in which target color characteristic values are realized with high accuracy by 3DLUT data generated by the methods described in the first to fourth embodiments described above are formed in a matrix , And one video data is divided on the display device 10 and displayed as one video.

  In a system in which a plurality of displays are arranged in a matrix and configured as a multi-display and display is performed with a large screen, since the display characteristics of the respective displays are not completely the same, gradations displayed between displays or There were times when the color was different. Therefore, the 3DLUT data generated by the method described in the first to fourth embodiments is written to the 3DLUT of the display device 10, and the characteristics of the display panel realize the target color measurement values, so that the differences in the characteristics of the display panel Absorb

  At this time, when the display device 10 configured as a multi-display realizes the same target color measurement value, color uniformity between display surfaces can be realized. Therefore, even in the case where one video data is divided and displayed as one video, it is possible to suppress the difference in gradation or color to be displayed between displays, and high-quality display becomes possible.

  According to the above-described embodiment, even in the case where the display device 10 has a multi-display configuration, it is possible to realize a flat, well-balanced large screen display in which variations among the display devices 10 are also suppressed, Not only gray color appearance but also all colors can be displayed uniformly, and variations between display surfaces can be suppressed. In particular, in a state where color uniformity correction in the plane of the display panel is being performed, high-quality display as the entire screen is possible without adjustment at the time of installation introduction even in a multi-display configuration to match common target value characteristics. It becomes.

[6. Modified example]
The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and the design and the like within the scope of the present invention are also claimed. include.

  Further, the color characteristic matching data generation processing unit and the mode setting unit may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or software using a CPU (central processing unit) It may be realized by For example, when the display device implements the color characteristic matching data generation processing unit and the mode setting unit by software, the display device executes a program instruction that is software that realizes each function, the above-mentioned program and various data A ROM (Read Only Memory) or a storage device (these are referred to as a "recording medium") recorded readable by a computer (or CPU), a RAM (Random Access Memory) for expanding the program, and the like. The object of the present invention is achieved by the computer (or CPU) reading the program from the recording medium and executing the program. As the recording medium, a “non-transitory tangible medium”, for example, a tape, a disk, a card, a semiconductor memory, a programmable logic circuit or the like can be used.

  The program may be supplied to the computer via any transmission medium (communication network, broadcast wave, etc.) capable of transmitting the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

  In the case of distribution in the market, the program can be stored and distributed in a portable recording medium, or can be transferred to a server computer connected via a network such as the Internet. In this case, of course, the storage device of the server computer is also included in the present invention.

DESCRIPTION OF SYMBOLS 10 display 20 interface 21 DVI terminal 22 HDMI terminal 23 LAN terminal 24 RS232C terminal 30 control unit 31 general control unit 32 video data processing unit 33 audio signal processing unit 34 panel controller 35 mode setting unit 36 color characteristic matching data processing unit 41 storage Unit 42 Power supply unit 43 Operation unit 44 Display unit 50 System control device 51 Control unit 52 Interface 53 Color characteristic matching data generation processing unit 54 Storage unit 60 Measuring instrument

Claims (13)

In a correction data generation device for generating a correction data to be used when the display device corrects an input image signal and outputs it to a display panel,
A panel colorimetric value acquiring unit for acquiring a panel colorimetric value which is a color value obtained by measuring a display color of the display panel with respect to first gradation data;
A target color characteristic value which is a target color value in the display panel with respect to second gradation data, and a reference data characteristic which is a color value which is a reference of the display panel with respect to the second gradation data. A storage unit for storing values and
A correction data generation unit that generates the correction data based on the panel colorimetric value, the reference data characteristic value, and the target color characteristic value;
Equipped with
The correction data generation unit
First interpolation data corresponding to the second gradation data is calculated from the panel colorimetric value;
The difference between the reference data characteristic value and the second interpolation data calculated corresponding to the second gradation data by extracting the color value of the first gradation data from the reference data characteristic value Calculate some difference data,
A correction data generation apparatus characterized by generating correction data based on extension data calculated based on the first interpolation data and the difference data, and the target color characteristic value.   2. The correction data generation apparatus according to claim 1, wherein the number of colors used as the first gradation data is equal to or less than the number of colors used as the second gradation data.   The interpolation data is data in which a color value corresponding to a gradation included only in the second gradation data is calculated by linear interpolation from the panel colorimetric value. The correction data generation device according to claim 1.   The difference data is calculated by linearly interpolating color values corresponding to gradation data included only in the second gradation data from the reference data characteristic value, and the reference data characteristic value is calculated from the interpolation value. The correction data generation apparatus according to any one of claims 1 to 3, wherein the data is calculated by subtraction.   The correction data generation apparatus according to any one of claims 1 to 4, wherein the extension data is data calculated by subtracting the difference data from the interpolation data. The storage unit stores a plurality of target color characteristic values.
The correction data generation apparatus according to any one of claims 1 to 5, wherein the correction data generation unit generates correction data corresponding to each of the plurality of target color characteristic values. The panel colorimetric value acquiring unit further acquires color values for one or more gradations included only in the second gradation data,
The correction data generation unit generates correction data after replacing the extension data with color values for one or a plurality of gradations included only in the second gradation data. The correction data generation device according to any one of the above 6. The correction data generation device further includes an evaluation determination unit that measures color of the display panel after applying the correction data, and determines whether a predetermined inspection standard is satisfied.
A panel colorimetric value is again acquired when it is determined by the said evaluation determination part not to satisfy | fill a predetermined test | inspection reference | standard, A correction data is produced | generated, The correction data are produced, It is characterized by the above-mentioned. Correction data generation device as described.   The correction data generation unit is a color value for gradation data included only in the second gradation data from the target color characteristic value when it is determined by the evaluation determination unit that the predetermined inspection standard is not satisfied. Is obtained by linear interpolation, and a value calculated by subtracting the reference data characteristic value is used as difference data, and from the extended data obtained by calculating the interpolation data and the difference data, and the target color characteristic value, 9. The correction data generation apparatus according to claim 8, generating correction data. A display panel, a correction data generation device for generating correction data for correcting an image signal according to the characteristics of the display panel, and correcting an input image signal based on the correction data, and performing display control on the display panel A display control device, comprising:
A display device characterized in that the display control device comprises the correction data generation device according to any one of claims 1 to 9.   A display device in which a plurality of display devices according to claim 10 are arranged in a matrix, and one video data is divided into the plurality of display devices and displayed as one video. In a correction data generation method, the display device generates correction data to be used when the input image signal is corrected and output to the display panel.
A panel colorimetric value acquiring step of acquiring a panel colorimetric value which is a color value obtained by measuring a display color of the display panel with respect to first gradation data;
A target color characteristic value which is a target color value in the display panel with respect to second gradation data, and a reference data characteristic which is a color value which is a reference of the display panel with respect to the second gradation data. Storing steps for storing values and
A correction data generation step of generating the correction data based on the panel colorimetric value, the reference data characteristic value, and the target color characteristic value;
Including
The correction data generation step is
First interpolation data corresponding to the second gradation data is calculated from the panel colorimetric value;
The difference between the reference data characteristic value and the second interpolation data calculated corresponding to the second gradation data by extracting the color value of the first gradation data from the reference data characteristic value Calculate some difference data,
A correction data generation method, comprising: generating correction data on the basis of extension data calculated based on the first interpolation data and the difference data, and the target color characteristic value. A computer that generates correction data to be used when the display device corrects the input image signal and outputs the corrected image signal to the display panel;
A panel colorimetric value acquiring function of acquiring a panel colorimetric value which is a color value obtained by measuring a display color of the display panel with respect to first gradation data;
A target color characteristic value which is a target color value in the display panel with respect to second gradation data, and a reference data characteristic which is a color value which is a reference of the display panel with respect to the second gradation data. Storage function to store values and
A correction data generation function of generating the correction data based on the panel colorimetric value, the reference data characteristic value, and the target color characteristic value;
To achieve
The correction data generation function is
First interpolation data corresponding to the second gradation data is calculated from the panel colorimetric value;
The difference between the reference data characteristic value and the second interpolation data calculated corresponding to the second gradation data by extracting the color value of the first gradation data from the reference data characteristic value Calculate some difference data,
A program comprising: generating correction data based on extension data calculated based on the first interpolation data and the difference data, and the target color characteristic value.