JP2016200804A - Image display device and control method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique that can effectively prevent health impairment caused by light in a predetermined color.SOLUTION: An image display device of the present invention comprises: display means that displays an image on a screen; calculation means that calculates the intensity of light in a predetermined color emitted from the screen on input image data when an image on the basis of the input image data is displayed on the screen; and notification means that performs predetermined notification on the basis of the intensity of light calculated by the calculation means.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an image display device and a control method thereof.

  The liquid crystal display device includes a liquid crystal panel, a backlight disposed on the back side of the liquid crystal panel, a control circuit for controlling the operation thereof, and the like. In recent years, from the viewpoints of wide color gamut reproduction, power saving, etc., liquid crystal display devices having white LEDs (LEDs that emit white light (light emitting diodes)), three primary color LEDs, and the like as backlight light emitting elements have become widespread. ing. The three primary color LEDs include a red LED, a green LED, and a blue LED.

  Here, it is said that there is a possibility that a health disorder eye may be caused by continuing to watch light (for example, blue light) on the short wavelength side in the visible wavelength region for a long time. Health disorders caused by blue light include eye fatigue, headache, changes in biological rhythm, and the like. Blue light is light having a wavelength of 380 nm or more and 495 nm or less, for example. In the JIS standard, a function as shown in FIG. 1 is defined as a failure function indicating the correspondence between the wavelength of light and the degree of influence of light on the human body. The obstacle function shown in FIG. 1 is called a “blue light obstacle function” because the degree corresponding to the wavelength of blue light (degree of influence) is large. The spectral characteristics of white LEDs and blue LEDs used in liquid crystal display devices and the like have a peak wavelength (wavelength with the largest spectral radiance) near the wavelength of 450 nm. That is, the peak wavelength of the spectral characteristics of the white LED and the blue LED is close to the peak wavelength of the obstacle function (the wavelength at which the influence of light on the human body is the greatest). For this reason, it is said that the light emitted from the white LED or the blue LED has a particularly great influence on the human body.

  Patent Document 1 discloses a technique for issuing a warning when the cumulative time of VDT (visual display terminal such as a personal computer) operation reaches a threshold value. However, in the technique disclosed in Patent Document 1, only the accumulated time of VDT work is considered, and the colors included in the image to be displayed are not considered. Therefore, when the user of the image display device continues to watch a display image (image displayed on the screen) containing a large amount of blue for a long time, the accumulated time of the VDT work does not reach the threshold value and no warning is issued. There is. As a result, it is not possible to effectively prevent health problems caused by light of a predetermined color such as blue light.

JP 2002-366129 A

  An object of this invention is to provide the technique which can prevent effectively the health disorder resulting from the light of a predetermined color.

The first aspect of the present invention is:
Display means for displaying an image on the screen;
Calculation means for calculating the amount of light of a predetermined color emitted from the screen when an image based on the input image data is displayed on the screen based on the input image data;
Notification means for performing a predetermined notification based on the light amount calculated by the calculation means;
It is an image display apparatus characterized by having.

The second aspect of the present invention is:
A display step for displaying an image on the screen;
Based on the input image data, a calculation step for calculating a light amount of a predetermined color emitted from the screen when an image based on the input image data is displayed on the screen;
A notification step of performing a predetermined notification based on the light amount calculated in the calculation step;
It is a control method of the image display apparatus characterized by having.

  According to a third aspect of the present invention, there is provided a program characterized by causing a computer to execute each step of the above-described image display apparatus control method.

  ADVANTAGE OF THE INVENTION According to this invention, the health disorder resulting from the light of a predetermined color can be prevented effectively.

The figure which shows an example of the blue light disturbance function which concerns on Example 1. FIG. 1 is a block diagram illustrating an example of a configuration of an image display apparatus according to a first embodiment. The flowchart which shows an example of the processing flow of the blue light quantity accumulation part which concerns on Example 1. FIG. The figure which shows an example of the time change of the blue light quantity which concerns on Example 1. FIG. The figure which shows an example of the time change of the working time which concerns on Example 1, and total light quantity. The figure which shows an example of the notification image which concerns on Example 1. FIG. FIG. 9 is a block diagram illustrating an example of a configuration of an image display device according to a second embodiment. The figure which shows an example of the installation position of the photometry sensor which concerns on Example 2. FIG. FIG. 6 is a block diagram illustrating an example of the configuration of an image display device according to a third embodiment. The figure which shows an example of the notification image which concerns on Example 3. FIG. FIG. 6 is a block diagram illustrating an example of a configuration of an image display device according to a fourth embodiment. FIG. 10 is a flowchart illustrating an example of a process flow of a mode management unit according to the fourth embodiment. The figure which shows an example of the notification image which concerns on Example 4. FIG. FIG. 10 is a diagram illustrating an example of a notification image and a reduction selection image according to the fourth embodiment.

<Example 1>
Hereinafter, an image display apparatus and a control method thereof according to Embodiment 1 of the present invention will be described. The present invention can be applied to any image display apparatus. For example, the present invention can be applied to a liquid crystal display device, an organic EL display device, a plasma display device, a projector, and the like. In this embodiment, an example in which the pixel value of the image data is an RGB value (a combination of the R value, the G value, and the B value) will be described, but the pixel value is not limited to the RGB value. For example, the pixel value may be a YCbCr value (a combination of a Y value, a Cb value, and a Cr value).

  FIG. 2 is a block diagram illustrating an example of the configuration of the image display apparatus 1 according to the present embodiment.

  The image data input unit 11 acquires image data (input image data) input to the image display device 1 and outputs the acquired input image data to the image processing unit 12. The image data input unit 11 detects input of input image data to the image display device 1, and inputs input presence / absence information indicating whether or not the input image data is input to the image display device 1. Output to. The input image data is input to the image display device 1 from, for example, a personal computer, a digital camera, various recorders (a hard disk recorder, a Blu-ray recorder, etc.), various players, a game machine, and the like. Note that the image data input unit 11 may acquire the input image data by reading the input image data from the recording medium. As the recording medium, a magnetic disk, an optical disk, a semiconductor memory, or the like can be used.

  The image processing unit 12 generates processed image data by performing predetermined image processing on the input image data output from the image data input unit 11. The predetermined image processing is, for example, image processing for converting pixel values of input image data in accordance with a set color temperature, color gamut, luminance, gamma, and the like. As predetermined image processing, edge enhancement processing, blurring processing, and the like may be performed. In the predetermined image processing, for example, the pixel value of the input image data is converted using a function or a LUT (Look Up Table) that represents the correspondence between the pixel value of the input image data and the pixel value of the processed image data. Then, the image processing unit 12 outputs the generated processed image data to the image composition unit 13.

  In addition, the image processing unit 12 uses the generated processed image data, the average value Rn of the R values of the processed image data, the average value Gn of the G values of the processed image data, and the average value of the B values of the processed image data Bn is calculated. Then, the image processing unit 12 outputs the luminance gain value L and the calculated average values Rn, Gn, Bn to the blue light amount calculation unit 18.

  A value other than the average value Rn may be calculated as a representative value representing the R value of each pixel of the processed image data. For example, instead of the average value Rn, the maximum value, minimum value, mode value, intermediate value, etc. of the R value of the processed image data may be calculated. The same applies to the G value and the B value.

  When the notification image data is output from the notification image generation unit 16, the image composition unit 13 generates composite image data by combining the notification image data and the processed image data output from the image processing unit 12. To do. Then, the image composition unit 13 outputs the generated composite image data to the display unit 14. The composite image data represents an image in which a notification image is superimposed on a processed image. The processed image is an image represented by the processed image data, and the notification image is an image represented by the notification image data. Details of the notification image (data) will be described later. In addition, when the notification image data is not output from the notification image generation unit 16, the image composition unit 13 outputs the processed image data to the display unit 14.

  The display unit 14 displays an image corresponding to the image data input to the display unit 14 on the screen. In this embodiment, an image corresponding to the processed image data or the composite image data is displayed. In addition, the display unit 14 changes at least one of the color and brightness of the screen (image displayed on the screen) using the set parameters. In this embodiment, an example in which a luminance gain value is used as the parameter will be described. The luminance gain value is a parameter that changes the luminance of the screen. For example, when the luminance gain value is increased by a factor of 2, the screen luminance is also increased by a factor of two, and when the luminance gain value is increased by a factor of four, the luminance of the screen is also increased by a factor of four. The luminance gain value L described above is the current setting value of the luminance gain value.

  The method for setting the parameters is not particularly limited. For example, the parameter may be set according to a user operation, or may be automatically set according to the usage environment of the image display device 1.

  The work time accumulating unit 15 measures the time (work time) when the user work is performed. The user work is a VDT work performed by the user using the image display device 1. In this embodiment, the work time accumulating unit 15 measures the display time of the display target image that is an image based on the input image data as the work time. In this embodiment, the display target image is an image corresponding to the processed image data.

Specifically, the work time accumulating unit 15 determines the presence / absence of input image data based on the input presence / absence information output from the image data input unit 11. The work time accumulating unit 15 regards the timing when the input of the input image data is started (restarted) as the timing when the user work is started (restarted), and the timing when the input of the input image data is ended (suspended). This is regarded as the timing when the user work is finished (suspended). The work time accumulating unit 15 starts the first increase process for gradually increasing the work time value at the timing when the input of the input image data is started. When the work time reaches the first threshold value, the work time accumulation unit 15 outputs information related to the work time (work time information) to the notification image generation unit 16. Then, the work time accumulating unit 15 interrupts the first increase process at the timing when the input of the input image data is finished, and starts the first reduction process for gradually reducing the work time value. The work time accumulating unit 15 ends the first reduction process at the timing when the value of the work time becomes 0 (zero). In addition, when the input of input image data is started during the execution of the first reduction process, the work time accumulating unit 15 interrupts the first reduction process at the timing when the input of the input image data is started.

  In addition, the work time accumulation unit 15 outputs work presence / absence information indicating whether or not a user work is being performed to the blue light amount accumulation unit 19. The work presence / absence information may be the same information as the input presence / absence information, or may be information different from the input presence / absence information.

  The unit of work time is not particularly limited. The unit of the work time may be a second unit or a minute unit. Further, the frequency of increase or decrease of the working time value is not particularly limited. For example, the work time may be updated every time 1 second elapses, the work time may be updated every time 10 seconds elapse, or the work time may be updated every time 30 seconds elapse. The work time may be updated every time 1 minute elapses, or the work time may be updated every time 5 minutes elapse. Moreover, the amount of reduction per unit time by the first reduction process is not particularly limited. For example, a value obtained by dividing the first threshold value by the time (rest time) required for recovery from the health disorder caused by the above work can be used as the reduction amount per unit time.

  The first reduction process is not limited to the above process. For example, the value of the work time may be reset to 0 when the display target image is not displayed before the threshold time elapses from the end of the display period of the display target image. Specifically, the work time accumulating unit 15 interrupts the first increase process at the timing when the input of the input image data is finished, and starts measuring the time when the user work is not performed (non-work time). May be. Then, the work time accumulating unit 15 may reset the value of the work time to 0 at the timing when the non-work time reaches the second threshold value (the above threshold time).

  The first threshold value and the second threshold value described above may be values determined in advance by the manufacturer, may be values that can be changed by the user, or may be in accordance with the use environment of the image display device 1. It may be a value set automatically.

The storage unit 17 stores the reference luminance gain value Lb, the blue light disturbance function B (λ), and the display unit size A [m ² ]. In addition, the storage unit 17 stores a plurality of spectral data respectively corresponding to a plurality of colors including a predetermined color. In this embodiment, the predetermined color is blue. In this embodiment, the storage unit 17 stores reference spectral data SR (λ), SG (λ), SB (λ), and SK (λ) as a plurality of spectral data. The reference luminance gain value Lb is a reference value for the luminance gain value. The reference luminance gain value Lb may be any value. The blue light disturbance function B (λ) represents the correspondence between the wavelength of light and the degree of light influence on the human body (FIG. 1). The display unit size A is the size of the screen. The reference spectroscopic data SR (λ) is spectroscopic data corresponding to red, the reference spectroscopic data SG (λ) is spectroscopic data corresponding to green, and the reference spectroscopic data SB (λ) is spectroscopic data corresponding to blue. It is data. The reference spectral data SK (λ) is spectral data corresponding to black. The spectral data represents the correspondence between the wavelength λ and the spectral radiance [W · m ⁻² · sr ⁻¹ · nm ⁻¹ ].

Each of the plurality of spectral data represents spectral characteristics of light emitted from the screen when image data of a color corresponding to the spectral data is displayed on the screen. In the present embodiment, each of the plurality of spectral data represents spectral characteristics of light emitted from the screen when image data of a color corresponding to the spectral data is displayed on the screen using the reference luminance gain value Lb.

  Here, a case is considered where the gradation values (R value, G value, and B value) of the image data are 8-bit values (0 to 255). The reference spectral data SR (λ) is obtained from the screen when image data of pixel values (R value, G value, B value) = (255, 0, 0) is displayed on the screen using the reference luminance gain value Lb. Represents the spectral characteristics of the emitted light. The reference spectral data SG (λ) represents the spectral characteristics of light emitted from the screen when the image data of the pixel value (0, 255, 0) is displayed on the screen using the reference luminance gain value Lb. The reference spectral data SB (λ) represents the spectral characteristics of light emitted from the screen when the image data of the pixel value (0, 0, 255) is displayed on the screen using the reference luminance gain value Lb. The reference spectral data SK (λ) represents the spectral characteristics of light emitted from the screen when the image data of the pixel value (0, 0, 0) is displayed on the screen using the reference luminance gain value Lb.

  Various data stored in the storage unit 17 may be updated in consideration of the deterioration of the display unit 14 over time. For example, when the display unit 14 includes a light-emitting unit and a display panel that displays an image on a screen by modulating light emitted from the light-emitting unit, taking into account deterioration over time of the light-emitting unit and the liquid crystal panel. Various data stored in the storage unit 17 may be updated. Spectral data may not be used for at least one of red, blue, green, and black. Spectral data corresponding to colors other than red, blue, green, and black may be used.

Based on the input image data (processed image data), the blue light amount calculation unit 18 emits light M of blue light (blue light; light of a predetermined color) emitted from the screen when the display target image is displayed on the screen. [W · sr ⁻¹ ] is calculated. Hereinafter, the light quantity M is referred to as “blue light quantity M”. In the present embodiment, the blue light quantity calculation unit 18 includes processed image data (average values Rn, Gn, Bn), a luminance gain value L, a reference luminance gain value Lb, a blue light disturbance function B (λ), a display unit size A, The blue light quantity M is calculated based on the reference spectral data SR (λ), SG (λ), SB (λ), and SK (λ). Then, the blue light quantity calculation unit 18 outputs the calculated blue light quantity M to the blue light quantity accumulation unit 19. Details of the method of calculating the blue light quantity M will be described later. Blue light is light having a wavelength of 380 nm or more and 495 nm or less, for example. Note that the wavelength range of blue light is not limited to the wavelength range of 380 nm to 495 nm. For example, the wavelength range of blue light may be narrower or wider than the wavelength range of 380 nm to 495 nm.

  The blue light amount accumulating unit 19 accumulates the blue light amount M calculated by the blue light amount calculating unit 18 during the display period of the display target image, thereby calculating the total light amount MT of blue light emitted from the screen up to now. In this embodiment, the display period of the display target image is treated as a period during which user work is being performed. Therefore, the phrase “accumulate the blue light quantity M during the display period of the display target image” can be replaced with the phrase “accumulate the blue light quantity M during the period when the user operation is performed”.

  Specifically, the blue light quantity accumulation unit 19 determines whether or not a user work is being performed based on the work presence / absence information output from the work time accumulation unit 15. The blue light quantity accumulating unit 19 starts the second increase process for gradually increasing the value of the total light quantity MT at the timing when the user work is started (restarted). When the total light amount MT reaches the third threshold value (first threshold light amount), the blue light amount accumulation unit 19 outputs information (total light amount information) regarding the total light amount MT to the notification image generation unit 16. Then, the blue light quantity accumulation unit 19 interrupts the second increase process at the timing when the user work is finished (interrupted), and starts the second reduction process for gradually reducing the value of the total light quantity MT. The blue light quantity accumulation unit 19 ends the second reduction process at the timing when the value of the total light quantity MT becomes zero. Further, when the user work is started during the execution of the second reduction process, the blue light quantity accumulation unit 19 interrupts the second reduction process at the timing when the user work is started. Therefore, in this embodiment, the value of the total light amount MT is gradually reduced during the non-display period of the display target image.

  Note that the frequency of increase or decrease in the value of the total light amount MT is not particularly limited. For example, the total light amount MT may be updated every time 1 second passes, the total light amount MT may be updated every time 10 seconds pass, or the total light amount MT may be updated every time 30 seconds pass. Good. The total light amount MT may be updated every time 1 minute elapses, or the total light amount MT may be updated every time 5 minutes elapse. Further, the amount of reduction per unit time by the second reduction process is not particularly limited. For example, a value obtained by dividing the third threshold value by the time (rest time) required for recovery from a health disorder caused by blue light can be used as the reduction amount per unit time.

  The second reduction process is not limited to the above process. For example, the value of the total light amount MT may be reset to 0 when the display target image is not displayed before the threshold time elapses from the end of the display period of the display target image. Specifically, the blue light amount accumulating unit 19 may interrupt the second increase process and start measuring the non-working time at the timing when the user work is finished. Then, the blue light amount accumulation unit 19 may reset the value of the total light amount MT to 0 at the timing when the non-working time reaches the fourth threshold value (the above threshold time).

  The third threshold value and the fourth threshold value described above may be values determined in advance by the manufacturer, may be values that can be changed by the user, or may be in accordance with the use environment of the image display device 1. It may be a value set automatically.

  The notification image generation unit 16 performs a predetermined notification process when the work time information is output from the work time accumulation unit 15 and when the total light amount information is output from the blue light amount accumulation unit 19. In this embodiment, the notification image generation unit 16 generates notification image data when the work time information is output from the work time accumulation unit 15 and when the total light amount information is output from the blue light amount accumulation unit 19. The generated notification image data is output to the image composition unit 13. The notification image represented by the notification image data is an image that prompts the user operation to be interrupted. Specifically, when the work time information is output from the work time accumulation unit 15, the notification image generation unit 16 acquires information indicating the current total light amount MT from the blue light amount accumulation unit 19. In addition, when the total light amount information is output from the blue light amount accumulation unit 19, the notification image generation unit 16 acquires information indicating the current work time from the work time accumulation unit 15. Based on the acquired information, the notification image generation unit 16 generates and outputs notification image data representing a current work time, a current total light amount MT, and a message that prompts the user to interrupt the work. Thereafter, the processing of the image composition unit 13 and the display unit 14 is performed, so that the user is notified of the current work time, the current total light amount MT, and a message that prompts the user to interrupt the work.

  Note that the information to be notified to the user and the notification method are not particularly limited as long as the user's work can be interrupted. For example, when work time information is output from the work time accumulation unit 15, predetermined information (message, graphic image (mark or symbol), etc.) at least indicating that the work time has reached the first threshold is displayed on the screen. May be displayed. When the total light amount information is output from the blue light amount accumulation unit 19, predetermined information indicating at least that the total light amount MT has reached the third threshold value may be displayed on the screen. Notification may be performed using sound or light (for example, light emitted from a lamp other than the screen) instead of displaying an image.

Next, a method for calculating the blue light quantity M [W · sr ⁻¹ ] according to the present embodiment will be described.

First, the blue light quantity calculation unit 18 calculates spectral data S (λ) [W · m ⁻² · sr ⁻¹ · nm ⁻¹ ] using the following Equation 1. The spectral data S (λ) represents the spectral characteristics of light emitted from the screen when the display target image is displayed on the screen.

Next, the blue light quantity calculation unit 18 calculates the blue light quantity M (W · sr ⁻¹ ) using the following Equation 2. In Equation 2, Δλ is the wavelength width [nm].

  Next, an example of the processing flow of the blue light quantity accumulation unit 19 will be described with reference to FIG. FIG. 3 is a flowchart showing an example of the processing flow of the blue light quantity accumulating unit 19. For example, the blue light amount accumulating unit 19 starts the flowchart of FIG. 3 at the timing when the image display device 1 is activated. In addition, the timing which starts the flowchart of FIG. 3 is not specifically limited. For example, the flowchart of FIG. 3 may be started at a timing when a predetermined operation mode is set as the operation mode of the image display apparatus 1. The blue light quantity accumulation unit 19 constantly (or regularly) monitors the work presence / absence information during the execution of the flowchart of FIG.

  First, the blue light amount accumulating unit 19 determines whether or not a user work is being performed based on the work presence / absence information from the work time accumulating unit 15 (S101). When it is determined that the user work is being performed, the process proceeds to S102, and when it is determined that the user work is not being performed, the process is returned to S101.

  In S <b> 102, the blue light amount accumulation unit 19 adds the blue light amount M output from the blue light amount calculation unit 18 to the total light amount MT. The initial value of the total light amount MT is zero. Therefore, at the start of the first user work, the same value as the blue light amount M is set as the total light amount MT. Next, the blue light quantity accumulating unit 19 determines whether or not a user work is being performed based on the work presence / absence information from the work time accumulating unit 15 (S103). If it is determined that user work is being performed, the process proceeds to S104. If it is determined that user work is not being performed, the process proceeds to S106.

  In S104, the blue light amount accumulating unit 19 determines whether or not the total light amount MT has reached a threshold value (third threshold value). If it is determined that the total light quantity MT has reached the threshold value, the process proceeds to S105, and if it is determined that the total light quantity MT has not reached the threshold value, the process returns to S102. In S <b> 105, the blue light amount accumulation unit 19 outputs the total light amount MT to the notification image generation unit 16. Thereafter, the process returns to S101.

  In S106, the blue light quantity accumulation unit 19 reduces the value of the total light quantity MT. Next, the blue light quantity accumulating unit 19 determines whether or not a user work is being performed based on the work presence / absence information from the work time accumulating unit 15 (S107). If it is determined that no user work is being performed, the process proceeds to S108, and if it is determined that a user work is being performed, the process proceeds to S102. In S108, the blue light quantity accumulation unit 19 determines whether or not the total light quantity MT has been reduced to zero. If it is determined that the total light quantity MT has been reduced to 0, the process returns to S101, and if it is determined that the total light quantity MT has not been reduced to 0, the process returns to S106.

FIG. 4 shows an example of the temporal change of the blue light quantity M, and FIG. 5 shows an example of the temporal change of the relative value of the working time value with respect to the first threshold value and the relative value of the total light quantity value with respect to the third threshold value. Indicates. 4 and 5 show changes over time during a period in which user work is being performed. That is, FIGS. 4 and 5 show temporal changes in the display period of the display target image.

  As shown in FIG. 5, the value of the working time increases linearly with the passage of time. When the input image data is still image data, the value of the blue light quantity M does not change over time. For this reason, when the input image data is image data of a still image, the value of the total light amount MT increases linearly with the passage of time, like the value of the working time. On the other hand, when the input image data is image data of a moving image, the value of the blue light quantity M is calculated every N frames (N is an integer of 1 or more). For example, as the average value Rn, an average value of R values of image data of a predetermined frame in N frames is used, or an average value of R values of image data of N frames is used. The same applies to the average values Gn and Bn. The predetermined frame is, for example, the first frame in the N frame. Then, using such average values Rn, Gn, and Bn, the blue light quantity M in the N frame period is calculated. Therefore, when the input image data is moving image data, the blue light quantity M irregularly changes (increases / decreases) over time as shown in FIG. As a result, when the input image data is moving image data, the total light amount MT increases irregularly with the passage of time, as shown in FIG.

  In the example of FIG. 5, the timing at which the total light amount MT reaches the third threshold is earlier than the timing at which the work time reaches the first threshold. This is because the user continued to watch images that emit a lot of blue light. In this embodiment, in such a case, a predetermined notification (first notification) is made in response to the total light amount MT reaching the third threshold value. As a result, it is possible to effectively prevent health problems caused by blue light.

  FIG. 6 is a diagram illustrating an example of a notification image when the timing at which the total light amount MT reaches the third threshold is earlier than the timing at which the work time reaches the first threshold. In the notification image of FIG. 6, information indicating the relative value of the work time and the total light amount MT with respect to the threshold value (specified value) is displayed. Specifically, in the notification image of FIG. 6, a scale display that the total light amount MT has reached the third threshold value (blue light load) and a current work time are displayed on a scale (VDT work load). Further, in the notification image of FIG. 6, a message prompting the user to rest is displayed. By displaying the notification image of FIG. 6, the user can grasp the degree of influence that the user's work and the blue light viewing have had on the health up to now.

  As described above, according to the present embodiment, when the total amount of light of a predetermined color emitted from the screen so far reaches a threshold value, a predetermined notification is performed. Thereby, the health disorder resulting from the light of a predetermined color can be prevented effectively. Further, according to the present embodiment, the predetermined notification is performed even when the time during which the user operation has been performed reaches the threshold value. Thereby, it is possible to effectively prevent health problems caused by user work.

  In this embodiment, an example in which the predetermined color is blue has been described, but the predetermined color is not particularly limited. For example, yellow, purple, white, etc. may be used as the predetermined color.

  In addition, the notification according to work time does not need to be performed. Even if notification according to the working time is not performed, it is possible to effectively prevent a health hazard caused by light of a predetermined color.

The method for calculating the blue light quantity M is not particularly limited. For example, the average value of the R values of the input image data is used as the average value Rn, the average value of the G values of the input image data is used as the average value Gn, and the average value of the B values of the input image data is used as the average value Bn. May be used. This method can be suitably used when an image corresponding to input image data is a display target image. For example, in this method, when the image display apparatus does not include the image processing unit 12, the image processing unit 1
When the image processing by 2 is omitted, it can be suitably used. Further, “L / Lb” in Expression 1 may be omitted. The method with this change can be suitably used when the current luminance gain value is a reference luminance gain value, when a fixed value (reference luminance gain value) is used as the luminance gain value, and the like.

<Example 2>
Hereinafter, an image display apparatus and a control method thereof according to Embodiment 2 of the present invention will be described. In the first embodiment, the example in which the blue light quantity M is calculated using the reference spectral data representing the spectral characteristics when the reference luminance gain value Lb is used has been described. In the present embodiment, an example in which the blue light quantity M is calculated more accurately by using the current spectral data (reference spectral data) when the luminance gain value L is used will be described. In the following, description of the same configuration and processing as in the first embodiment will be omitted.

  FIG. 7 is a block diagram illustrating an example of the configuration of the image display apparatus 1 according to the present embodiment.

  The image processing unit 12 generates processed image data by the same method as in the first embodiment, and outputs the generated processed image data to the image composition unit 13. Then, the image processing unit 12 calculates the average values Rn, Gn, Bn in the same manner as in the first embodiment, and outputs the calculated average values Rn, Gn, Bn to the blue light amount calculation unit 18. In this embodiment, the image processing unit 12 outputs the luminance gain value L to the photometry control unit 21.

  The image composition unit 13 performs the same processing as in the first embodiment. Further, in the present embodiment, the image composition unit 13 generates photometric image data in response to a patch display request from the photometry control unit 21, and combines the image data for photometry with the processed image data. Generate. Then, the image composition unit 13 outputs the generated composite image data to the display unit 14. The composite image data obtained by combining the photometric image data with the processed image data is an image in which the photometric image is superimposed on the processed image. The photometric image is an image represented by photometric image data. Details of the photometric image will be described later. In this embodiment, the image composition unit 13 displays the processed image data when the notification image data is not output from the notification image generation unit 16 and when the patch display request is not output from the photometry control unit 21. To the unit 14.

The storage unit 17 stores the blue light disturbance function B (λ) and the display unit size A [m ² ].

  The blue light quantity calculation unit 18 performs the same processing as in the first embodiment. However, in the present embodiment, the blue light amount calculation unit 18 performs processing image data (average values Rn, Gn, Bn), blue light disturbance function B (λ), display unit size A, and reference spectral data SR (λ). , SG (λ), SB (λ), and SK (λ), the blue light quantity M is calculated. The average values Rn, Gn, and Bn are acquired from the image processing unit 12, the blue light disturbance function B (λ) and the display unit size A are acquired from the storage unit 17, and the reference spectral data SR (λ), SG (λ), SB (λ) and SK (λ) are acquired from the photometry control unit 21. Details of the method of calculating the blue light quantity M will be described later.

  The photometric sensor 20 measures the light emitted from the screen in response to a photometric request from the photometric control unit 21. Then, the photometric sensor 20 outputs a measured value (spectral data) of light emitted from the screen to the photometric control unit 21. The photometric sensor 20 is provided, for example, at the edge of the screen. In the example of FIG. 8, it is provided in the upper right corner of the screen.

In this embodiment, the light emitted from the photometric image display area is measured by the photometric sensor 20 during the period in which the photometric image is displayed. The photometric image is, for example, a patch image having a uniform color, an image including a plurality of patch images respectively corresponding to a plurality of colors, a graphic image including a plurality of colors, or the like. By measuring the light emitted from the screen for each of a plurality of colors, a plurality of spectral data respectively corresponding to the plurality of colors are acquired as measurement values. When one patch image is used as the photometric image, a plurality of spectral data corresponding to a plurality of colors can be obtained by sequentially displaying the plurality of photometric images. In this embodiment, the light emitted from the display area of the patch image is measured in a state where the patch image having the pixel value (255, 0, 0) is displayed using the luminance gain value L. Thereby, reference spectral data SR (λ) is obtained. Similar measurements are performed for pixel values (0, 255, 0), (0, 0, 255), (0, 0, 0), and reference spectral data SG (λ), SB (λ), SK (λ ) Is obtained.

  In this embodiment, the spectral data (measured value) indicating the spectral characteristics when the luminance gain value L is used is not the spectral data indicating the spectral characteristics when the reference luminance gain value Lb is used, but the reference spectral data. SR (λ), SG (λ), SB (λ), and SK (λ) are obtained. In the present embodiment, spectral data representing the current spectral characteristics is obtained as reference spectral data SR (λ), SG (λ), SB (λ), and SK (λ).

  The photometric sensor 20 may be provided so as to be movable to a position that does not overlap the screen. For example, the photometric sensor 20 may be provided so as to be housed in a bezel surrounding the screen. The position of the photometric sensor 20 may be changed manually or automatically. For example, the photometric sensor 20 may be automatically housed in the bezel during a period in which photometry (light measurement) is not performed. The photometric sensor 20 may be a separate device from the image display device 1.

  The photometry control unit 21 outputs a patch display request to the image composition unit 13 and outputs a photometry request to the photometry sensor 20 in accordance with the change in the luminance gain value L output from the image processing unit 12. Then, the photometry control unit 21 acquires the measurement values (reference spectral data SR (λ), SG (λ), SB (λ), SK (λ)) output from the photometry sensor 20, and uses the acquired measurement values. This is output to the blue light quantity calculation unit 18. For this reason, in this embodiment, photometry is performed at the timing when the luminance gain value L changes. Note that the timing of photometry is not particularly limited. For example, photometry may be performed in response to a user operation requesting photometry.

Next, a method for calculating the blue light quantity M [W · sr ⁻¹ ] according to the present embodiment will be described. First, the blue light amount calculation unit 18 calculates spectral data S (λ) [W · m ⁻² · sr ⁻¹ · nm ⁻¹ ] using the following Equation 3. Next, the blue light quantity calculation unit 18 calculates the blue light quantity M (W · sr ⁻¹ ) using the formula 2 described in the first embodiment.

As described above, according to the present embodiment, the blue light quantity M is calculated using the reference spectral data satisfying the following conditions 1 and 2. Thereby, the blue light quantity M can be calculated more accurately. As a result, health problems caused by blue light (predetermined color light) can be more effectively prevented.
Condition 1: Reference spectral data represents spectral characteristics of light emitted from the screen when image data of a color corresponding to the reference spectral data is displayed on the screen using the current setting value of the parameter.
Condition 2: The reference spectral data represents the current spectral characteristics of light emitted from the screen when image data of a color corresponding to the reference spectral data is displayed on the screen.

One of the conditions 1 and 2 described above may not be satisfied. If at least one of the conditions 1 and 2 is satisfied, the blue light quantity M can be calculated more accurately. For example, a luminance gain value Lb may be set when displaying a photometric image, and reference spectral data representing spectral characteristics when the luminance gain value Lb is used may be acquired. Even with such a method, it is possible to acquire reference spectral data representing the current spectral characteristics. Specifically, reference spectral data representing spectral characteristics in the current deterioration state of the display unit 14 can be acquired. Further, information (function or table) indicating the correspondence relationship between the luminance gain value and the reference spectral data is prepared in advance, and the reference spectral data corresponding to the luminance gain value L may be acquired using the information.

<Example 3>
Hereinafter, an image display apparatus and a control method thereof according to Embodiment 3 of the present invention will be described. In the first and second embodiments, the example in which the working time and the total light amount MT are obtained on the assumption that there is one user of the image display device has been described. In the present embodiment, an example will be described in which the working time and the total light amount MT are obtained on the assumption that there are a plurality of users of the image display apparatus. In the present embodiment, for example, when a plurality of users use the simultaneous image display device, when a plurality of users use the image display device in order, the working time and the total light amount MT are obtained. In the following, description of the same configuration and processing as in the first embodiment will be omitted.

  FIG. 9 is a block diagram illustrating an example of the configuration of the image display apparatus 1 according to the present embodiment.

  The imaging unit 22 generates photographed image data by photographing the front side of the screen. Then, the imaging unit 22 outputs the generated captured image data to the user identification unit 23. The imaging unit 22 is provided on the upper side of the screen, for example. The position of the imaging unit 22 is not particularly limited. The imaging unit 22 may be a separate device from the image display device 1.

  The user identification unit 23 identifies the current user of the image display device 1. In the present embodiment, the user identifying unit 23 identifies the person who is in front of the screen as the current user of the image display device 1 by analyzing the captured image data output from the imaging unit 22. Then, the user identification unit 23 outputs information about the identified user (user information) to the work time accumulation unit 15. In this embodiment, image data representing user (user image data) is used as user information. The user image data may be image data registered in advance or image data extracted from the captured image data. When additional information such as a user name is registered in advance, information including user image data and additional information is used as user information.

  The registration method of user image data and additional information is not particularly limited. For example, various data and information may be registered when the user operates the image display device 1. Various data and information may be registered using an external device such as a personal computer. Further, the user identification method is not particularly limited. For example, the current user of the image display device 1 may be identified according to the user name (user ID) input to the image display device 1 by the user.

  The work time accumulating unit 15 performs the same processing as in the first embodiment. However, in this embodiment, the work time accumulating unit 15 individually calculates the work time for each of a plurality of users. When the work time of at least one user reaches the first threshold, the work time accumulating unit 15 notifies at least the work time information and user information of the user whose work time has reached the first threshold. Output to the generator 16. In addition, when the work time accumulation unit 15 outputs the work presence / absence information to the blue light amount accumulation unit 19, the work time accumulation unit 15 also outputs the user information obtained from the user identification unit 23 to the blue light amount accumulation unit 19.

  The blue light amount accumulating unit 19 performs the same processing as in the first embodiment. However, in the present embodiment, the blue light quantity accumulation unit 19 individually calculates the total light quantity MT for each of a plurality of users. When the total light amount MT of at least one user has reached the third threshold value, the blue light amount accumulation unit 19 at least displays the total light amount information and user information of the user whose total light amount MT has reached the third threshold value. The notification image generation unit 16 outputs the notification image.

  The notification image generation unit 16 performs the same processing as in the first embodiment. However, in this embodiment, when the work time information and the user information are output from the work time accumulation unit 15, the notification image generation unit 16 calculates the current total light amount MT of the user whose work time has reached the first threshold value. Information to be shown is acquired from the blue light quantity accumulation unit 19. In addition, when the total light amount information and the user information are output from the blue light amount accumulation unit 19, the notification image generation unit 16 displays information indicating the current work time of the user whose total light amount MT has reached the third threshold value as the work Obtained from the time accumulating unit 15. Then, the notification image generation unit 16 generates and outputs notification image data based on the acquired information. Specifically, the notification image generation unit 16 includes the acquired user information, the current work time of the user corresponding to the acquired user information, the current total light amount MT of the user corresponding to the acquired user information, and the user work Notification image data representing a message prompting the user to interrupt is generated.

  FIG. 10 is a diagram illustrating an example of the notification image according to the present embodiment. FIG. 10 is a diagram illustrating an example of a notification image when the timing at which the total light amount MT reaches the third threshold is earlier than the timing at which the work time reaches the first threshold. In the notification image of FIG. 10, the user's work time when the total light amount MT has reached the third threshold and the total light amount MT are displayed in a scale as in the first embodiment. In the notification image of FIG. 10, a message prompting the user to rest is displayed as in the first embodiment. Furthermore, in the notification image of FIG. 10, user information of a user whose total light amount MT has reached the third threshold is displayed. Thereby, the user can easily grasp who needs to rest.

  Note that the information indicated by the notification image is not limited to the above information. For example, a notification image indicating various information about all users identified by the user identifying unit 23 may be displayed. A notification image may be displayed that shows various information about a user whose at least one of the difference between the work time and the first threshold and the difference between the total light amount MT and the third threshold is the fifth threshold or less. A notification image indicating various types of information about the user identified by the user identification unit 23 and having the difference equal to or smaller than the fifth threshold value may be displayed. The notification image may be any image as long as the user's work can be interrupted. User information may be omitted from the notification image. A notification image in which a message such as “Please stop work for **** (user name)” may be displayed.

  As described above, according to the present embodiment, the total light amount is calculated individually for each of a plurality of users of the image display apparatus. Then, when the total light amount of at least one user reaches a threshold value, a predetermined notification is performed. Thereby, it is possible to prevent the predetermined notification from being performed even though the total amount of the light of the predetermined color viewed by the user is smaller than the threshold value, and to notify each user at an appropriate timing. As a result, it is possible to more effectively prevent each user's health problems. For example, in the first and second embodiments, when another user starts the user operation after the user has performed the user operation for a long time, a predetermined notification (inappropriate notification) is performed immediately after the start of the other user. There is. In the present embodiment, occurrence of such inappropriate notification can be suppressed. In the present embodiment, as the predetermined notification, processing for displaying on the screen predetermined information indicating at least a user whose total light amount has reached the threshold value is performed. Thereby, the user can easily grasp who needs to rest. Note that the above processing of this embodiment is also applicable to the second embodiment.

<Example 4>
Hereinafter, an image display apparatus and a control method thereof according to Embodiment 4 of the present invention will be described. In the first, second, and third embodiments, the example in which the notification image is presented to the user when the load due to the blue light reaches the specified amount has been described. In the present embodiment, an example will be described in which the blue light of the image display device is reduced or the user is prompted to reduce the blue light when the load due to the blue light reaches a specified amount. In the following, description of the same configuration and processing as in the first embodiment will be omitted.

  FIG. 11 is a block diagram illustrating an example of the configuration of the image display apparatus 1 according to the present embodiment.

  The user operation receiving unit 24 receives a user operation such as pressing a button installed on the main body of the image display device 1, for example. Then, the user operation reception unit 24 outputs user operation information corresponding to the performed user operation to the mode management unit 25. The user operation is not limited to a button press, and may be a user operation using an infrared remote controller, a touch panel, or the like.

  The mode management unit 25 manages the blue light reduction mode. The number of types of the blue light reduction mode is not particularly limited, but in this embodiment, three types of modes of “automatic reduction”, “manual reduction”, and “no reduction” are used as the blue light reduction mode. The mode management unit 25 selects any one of the three modes according to the user operation information output from the user operation reception unit 24 (for example, user operation information according to the user operation specifying the blue light reduction mode). And set.

  “Automatic reduction” is a mode in which blue light (blue light amount M) is automatically reduced when the total light amount MT of blue light reaches a threshold value. In “automatic reduction”, when the total light amount information is input from the blue light amount accumulation unit 19, the mode management unit 25 outputs a blue light reduction instruction for reducing the blue light amount M to the image processing unit 12. Further, the mode management unit 25 outputs a reduction notification image generation instruction for notifying the user that the blue light amount M has been reduced, to the notification image generation unit 16.

  “Manual reduction” is a mode that allows the user to select whether or not to reduce the blue light amount M when the total light amount MT of the blue light reaches a threshold value. In “manual reduction”, when the total light amount information is input from the blue light amount accumulating unit 19, the mode management unit 25 issues a reduction selection image generation instruction for the user to select whether or not to reduce the blue light amount M. And output to the reduced selection image generation unit 26. The mode management unit 25 outputs a blue light reduction instruction to the image processing unit 12 and outputs a reduction notification image generation instruction to the notification image generation unit 16 when the user selects to reduce the blue light amount M. To do.

  “No reduction” is a mode in which the blue light quantity M is not reduced even when the total light quantity MT of blue light reaches the threshold value. In “no reduction”, the image display apparatus 1 performs the same operation as in the first embodiment.

  When a blue light reduction instruction is input from the mode management unit 25, the image processing unit 12 further performs image processing for reducing blue (blue reduction processing) in order to generate processed image data. For example, as a blue reduction process, for each pixel value, a blue reduction filter (a coefficient that multiplies the R value, a coefficient that multiplies the G value, and a coefficient that multiplies the B value) = (1.0, 1.0, 0. Image processing applying 3) is performed. When the blue color reduction filter (1.0, 1.0, 0.3) is used, the pixel value (R value, G value, B value) = (200, 200, 200) is the pixel value (200, 200, 200). 60). The blue light quantity M can be reduced by such image processing.

The execution order of the predetermined image processing described in the first embodiment and the image processing for reducing blue is not particularly limited. The blue color reduction process may be performed by a functional unit different from the image processing unit 12. The value of each coefficient of the blue reduction filter is not limited to the above value. The method for reducing the blue light quantity M is not limited to the above method. For example, in an image display device that displays an image by modulating light from a light emitting unit (such as a backlight), the blue light quantity M can be reduced by changing the light emission color of the light emitting unit. Specifically, the blue light quantity M can be reduced by reducing the blue component of the light from the light emitting unit. When the light emitting unit has a blue light source (a light source that emits blue light), the blue light amount M can be reduced by reducing the light emission luminance of the blue light source.

  When the blue light reduction mode “manual reduction” is set and the total light amount MT reaches the threshold value (third threshold value), the mode management unit 25 instructs the reduction selection image generation unit 26 to generate the reduction selection image. Is entered. The reduction selection image generation unit 26 generates selection image data representing a reduction selection image for causing the user to select whether or not to reduce the blue light amount M in response to an input of the reduction selection image generation instruction. The image data is output to the image composition unit 13.

  Next, an example of the processing flow of the mode management unit 25 will be described with reference to FIG. FIG. 12 is a flowchart illustrating an example of a processing flow of the mode management unit 25. The mode management unit 25 starts the flowchart of FIG. 12 at the timing when the total light amount information is input from the blue light amount accumulating unit 19.

  First, the mode management unit 25 determines the currently set blue light reduction mode (S201). If “automatic reduction” is set, the process proceeds to S205 in order to reduce the blue light quantity M. If “manual reduction” is set, the process proceeds to S202 in order to allow the user to select whether or not to reduce the blue light amount M. If “no reduction” is set, the mode management unit 25 determines that the reduction of the blue light quantity M is unnecessary, and ends this flowchart.

  In S202, the mode management unit 25 outputs a reduction selection image generation instruction to the reduction selection image generation unit 26, and the process proceeds to S203. In S203, the mode management unit 25 acquires user operation information from the user operation reception unit 24, and advances the process to S204. In S204, the mode management unit 25 determines whether or not the user has selected to reduce the blue light amount M from the user operation information. If the user has selected to reduce the blue light amount M, the process proceeds to S205, and if the user has selected not to reduce the blue light amount M, this flowchart is ended. In S205, the mode management unit 25 outputs a blue light reduction instruction to the image processing unit 12 in order to reduce the blue light amount M, and the process proceeds to S206. In S206, the mode management unit 25 outputs a reduction notification image generation instruction to the notification image generation unit 16, and the present flowchart is ended.

  FIG. 13 is a diagram illustrating an example of a notification image when the blue light reduction mode “automatic reduction” is set and the total light amount MT reaches a threshold value (third threshold value). In the notification image of FIG. 13, the user's working time when the total light amount MT has reached the third threshold and the total light amount MT are displayed in a scale as in the first embodiment. In the notification image of FIG. 13, a message prompting the user to rest is displayed as in the first embodiment. Further, in the notification image of FIG. 13, a message (reduction notification image) indicating that the blue light amount M has been automatically reduced in order to reduce the load on the user is displayed. Thereby, the user can grasp that the blue light quantity M has been reduced. The reduction notification image is generated by the notification image generation unit 16 according to the reduction notification image generation instruction.

  Note that the method of notifying the user whether or not the blue light amount M of the image display device has been reduced is not limited to the above method. For example, a blue light reduction notification mark may be displayed instead of the message. The user may be notified whether or not the amount of blue light M has been reduced by changing the color of the power lamp or the like of the image display apparatus main body. The user may be notified by sound from the sound output device that the blue light quantity M has been reduced in conjunction with the sound output device. The method for notifying information to the user is not particularly limited.

FIG. 14 is a diagram illustrating an example of a notification image and a reduction selection image when the blue light reduction mode “manual reduction” is set and the total light amount MT has reached a threshold (third threshold). FIG.
In the notification image, the user's working time when the total light amount MT has reached the third threshold and the total light amount MT are displayed in a scale as in the first embodiment. In the notification image of FIG. 14, a message prompting the user to rest is displayed as in the first embodiment. Further, in the example of FIG. 14, a menu image (reduction selection image) that allows the user to select whether or not to reduce the blue light amount M is displayed. Thereby, the user can select whether to reduce the blue light quantity M or not. When the user selects to reduce the blue light quantity M, a notification image similar to that in FIG. 13 is generated and displayed. The reduction selection image is generated by the reduction selection image generation unit 26 according to the reduction selection image generation instruction, and is synthesized by the image synthesis unit 13. As a result, the reduced selection image is displayed on the screen.

  As described above, according to the present embodiment, the blue light of the image display device is automatically reduced when the load due to the blue light reaches a specified amount by the blue light reduction mode “automatic reduction”. Thereby, the load with respect to a user's continuous operation | work can be reduced. In addition, the blue light reduction mode “manual reduction” mode can prevent an unintentional change in display color (screen color) due to automatic reduction of blue light. Further, the blue light can be intentionally reduced by the blue light reduction mode “manual reduction” mode. As a result, it is possible to prevent the user's work from being hindered while effectively preventing the user's health disorder. In this embodiment, as a predetermined notification, a process for displaying on the screen information indicating that the blue light has been reduced is performed. Thereby, the user can easily grasp whether or not the blue light of the image display device is reduced. Note that the above processing of this embodiment is also applicable to the second and third embodiments.

  In the first to fourth embodiments, the example in which the notification image is displayed on the screen based on the total light amount MT of blue light has been described. However, the present invention is not limited to this. The notification image may be displayed (predetermined notification) based on the blue light quantity M. For example, if there is a lot of blue light emitted from the screen, there is a possibility that a health hazard to the user may occur. Therefore, the configuration may be such that the second notification (display of a predetermined notification image) is performed when the blue light amount M calculated by the blue light amount calculation unit 18 is greater than or equal to the second threshold light amount. For example, when the blue light amount M is equal to or greater than the second threshold light amount, an image (an image that calls attention to the user) such as “An image with a large amount of blue light. It may be a configuration. Thus, as the notification image, an image that at least indicates that the blue light amount M is equal to or greater than the second threshold light amount can be used. The second notification may be performed when the blue light amount M is equal to or greater than the second threshold light amount, and the first notification may be performed when the total light amount MT reaches the first threshold light amount. The second threshold light quantity may be a value determined in advance by the manufacturer, may be a value that can be changed by the user, or is a value that is automatically set according to the use environment of the image display device. There may be. Similar to the first notification, the second notification may be performed using sound, light, a graphic image, or the like.

<Other examples>
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

1: Image display device 13: Image composition unit 14: Display unit 16: Notification image generation unit 18: Blue light amount calculation unit 19: Blue light amount accumulation unit

Claims (20)

Display means for displaying an image on the screen;
Calculation means for calculating the amount of light of a predetermined color emitted from the screen when an image based on the input image data is displayed on the screen based on the input image data;
Notification means for performing a predetermined notification based on the light amount calculated by the calculation means;
An image display device comprising: The image display apparatus according to claim 1, wherein the predetermined color is blue. The image display apparatus according to claim 1, wherein the light of the predetermined color is light having a wavelength of 380 nm or more and 495 nm or less. The image processing apparatus further includes generation means for generating processed image data by performing predetermined image processing on the input image data,
The image based on the input image data is an image according to the processed image data,
The image display apparatus according to claim 1, wherein the calculation unit calculates the light amount based on the processed image data. The calculating means includes
The input image data;
An obstacle function that expresses the correspondence between the wavelength of light and the degree of light influence on the human body,
The size of the screen, and
Based on a plurality of spectral data respectively corresponding to a plurality of colors including the predetermined color, the light amount is calculated,
5. Each of the plurality of spectral data represents spectral characteristics of light emitted from the screen when image data of a color corresponding to the spectral data is displayed on the screen. The image display device according to any one of the above. The display means changes at least one of the color and brightness of the screen using a set parameter,
The calculation means calculates the light amount based on the input image data, the obstacle function, the screen size, the plurality of spectral data, the current setting value of the parameter, and a reference value of the parameter. ,
Each of the plurality of spectral data represents spectral characteristics of light emitted from the screen when image data of a color corresponding to the spectral data is displayed on the screen using the reference value of the parameter. The image display device according to claim 5. The display means changes at least one of the color and brightness of the screen using a set parameter,
Each of the plurality of spectral data represents spectral characteristics of light emitted from the screen when image data of a color corresponding to the spectral data is displayed on the screen using a current setting value of the parameter. The image display device according to claim 5. For each of the plurality of colors, the image processing apparatus further includes acquisition means for acquiring spectral data representing current spectral characteristics of light emitted from the screen when image data of the color is displayed on the screen.
The image display device according to claim 5, wherein the calculation unit calculates the light amount using a plurality of spectral data acquired by the acquisition unit. Accumulating means for calculating the total light amount of the light of the predetermined color emitted from the screen so far by accumulating the light amount calculated by the calculating means during the display period of the image based on the input image data. In addition,
The image according to any one of claims 1 to 8, wherein the notification unit performs the first notification when the total light amount calculated by the accumulation unit reaches a first threshold light amount. Display device. The image display device according to claim 9, wherein the first notification is a process of displaying predetermined information on the screen at least indicating that the total light amount has reached the first threshold light amount. . 11. The image display device according to claim 9, wherein the accumulation unit gradually reduces the value of the total light amount during a non-display period of the image based on the input image data. The accumulating means sets the value of the total light amount when the display of the image based on the input image data is not performed before the threshold time elapses from the end of the display period of the image based on the input image data. It resets to 0, The image display apparatus of any one of Claims 9-11 characterized by the above-mentioned. An identification means for identifying a current user of the image display device;
The accumulating means individually calculates the total light amount for each of a plurality of users of the image display device,
The said notification means performs said 1st notification, when the total light quantity of at least one user reaches said 1st threshold light quantity, The any one of Claims 9-12 characterized by the above-mentioned. Image display device. The image display device according to claim 13, wherein the first notification is a process of displaying predetermined information indicating at least a user whose total light amount has reached the first threshold light amount on the screen. . 15. The apparatus according to claim 9, further comprising a reducing unit that reduces the light amount when the total light amount calculated by the accumulating unit reaches the first threshold light amount. Image display device. The image display device according to claim 15, wherein the notification unit performs the second notification when the light amount is reduced by the reduction unit. When the total light amount calculated by the accumulating means reaches the first threshold light amount, it further comprises selection means for allowing the user to select whether to reduce the light amount,
The image display device according to claim 15, wherein the reduction unit reduces the light amount when the user selects to reduce the light amount. 18. The image display according to claim 1, wherein the notification unit performs the second notification when the light amount calculated by the calculation unit is equal to or greater than a second threshold light amount. apparatus. A display step for displaying an image on the screen;
Based on the input image data, a calculation step for calculating a light amount of a predetermined color emitted from the screen when an image based on the input image data is displayed on the screen;
A notification step of performing a predetermined notification based on the light amount calculated in the calculation step;
A control method for an image display device, comprising:   A program causing a computer to execute each step of the control method for an image display device according to claim 19.

Images