JP4544948B2 - Image display control device - Google Patents

Description

  The present invention relates to an image display control apparatus that controls image display, and more particularly to an image display control apparatus that enables adjustment of a biological rhythm by appropriately controlling the color of a display image according to time. .

  In recent years, various display devices such as CRT (Cathode Ray Tube), liquid crystal display, plasma display, and projection display have been put into practical use. Conventionally, in these display devices, the user has set brightness, hue, and the like by himself / herself in accordance with the ambient light environment in which the display device is used. However, display devices have been used in various places, and depending on the situation, setting has become very troublesome. For example, in display devices used in in-vehicle devices, the brightness of the surroundings changes greatly depending on the situation, so if you try to set it yourself so that the user can easily see it, the brightness and hue will change each time There was a need.

  Various methods have been proposed as means for overcoming these problems. For example, in the “electronic display device” described in Patent Document 1, in order to change the brightness of the backlight and the color of the display unit in accordance with the ambient brightness, it is automatically changed by changing the time. A display device has been proposed that makes it easy to view. In other words, by looking at the time, the brightness of the surroundings is predicted and the display is changed.

  In addition, the “image display control device” described in Patent Document 2 includes a light receiving unit that receives ambient illumination light, and corrects an image according to the output of the light receiving unit. To display various images. However, these display devices focus only on the visibility and quality of an image in consideration of the light environment (ambient light), and do not consider the influence of the light of the display device on the human body.

  It is known that a living body has a timing mechanism in the body and controls periodic phenomena related to biological functions, and one of the periodic phenomena is a rhythm with a period of 24 to 25 hours called a circadian rhythm (non-patented). Reference 1). Typical examples of the circadian rhythm include sleep and awakening, body temperature change, etc. The light environment is a major factor that synchronizes this rhythm in 24 hours. The amount of melatonin secretion is closely related to the rhythm of sleep and wakefulness, and the amount of melatonin secretion is suppressed during wakefulness. Light has an effect on the secretory amount of melatonin, and when the degree of melatonin suppression with respect to light having an emission wavelength of 440 nm to 600 nm was investigated, it was found that the light having a wavelength around 464 nm in particular has the highest melatonin suppression effect. It is obtained (see Non-Patent Document 2). In recent years, it has been necessary to consider the influence of light from the display device because the time for which the display device is kept has increased.

As a proposal using the secretion of melatonin, there is an artificial lighting planning method according to a biological rhythm, such as the “artificial lighting planning method” described in Patent Document 3.
JP 7-38909 A JP 2003-37852 A JP 2000-294384 A “Temporal biological understanding of biological system characteristics through modeling”, Measurement and Control Vol. 41, No. 10, October 2002 “Action Spectrum for Melatonin Regulation in Humans: Evide-nce for a Novel Circadian Photoreceptor”, The Journal of Neuroscience, August 15, 2001

  However, conventionally, since the influence of the light of the display device on the biological rhythm has not been considered, no display device has a biological rhythm adjustment function. Another problem is that if the color of the image is changed according to the biological rhythm, the image becomes difficult to see.

  An object of the present invention is to provide an image display control device that has a function of adjusting a biological rhythm by the light of a display device and can make an image appear more natural.

The present invention Oite the image display control device for controlling the color tone of the image displayed on the display unit,
When giving the viewer an awakening effect, the blue signal value of the display image is increased relative to the signal value of a color other than blue, and when giving the viewer a calming effect, the display image A hue control unit that reduces the blue signal value of the color relative to the signal values of colors other than blue ,
The hue control unit increases or decreases a blue signal value in a black level portion of a display image relative to a signal value of a color other than blue .

Further, the present invention provides an image display control device that controls the hue of an image displayed on a display unit.
When giving the viewer an awakening effect, the blue signal value of the display image is increased relative to a signal value other than blue, and when giving the viewer a calming effect, the blue image value of the display image is increased. A hue control unit that reduces the signal value of the signal relative to the signal value of colors other than blue,
The hue control unit is characterized in that when changing the hue of the display image, the hue is changed only in a portion where the blue signal value is larger than the reference value.

Further, the present invention provides an image display control device that controls the hue of an image displayed on a display unit.
Viewing the case of no effect of awakening for the listener relative increase the color signal values of other than blue signal values blue display image on the display in the case of no effect of calming for viewer image A hue control unit that reduces the blue signal value of the color relative to the signal values of colors other than blue,
The hue control unit is characterized in that when changing the hue of the display image, the hue is changed only in a portion where the blue signal value is larger than the signal values of colors other than blue .

Further, the present invention provides an image display control device that controls the hue of an image displayed on a display unit.
When giving the viewer an awakening effect, the blue signal value of the display image is increased relative to the signal value of a color other than blue, and when giving the viewer a calming effect, the display image A hue control unit that reduces the blue signal value of the color relative to the signal values of colors other than blue,
When changing the hue of the display image, the hue control unit increases the amount of blue change as the ratio of the blue signal value increases with respect to the total of all signal values representing one pixel. It is characterized by changing the hue.

Further, the present invention provides an image display control device that controls the hue of an image displayed on a display unit.
When giving the viewer an awakening effect, the blue signal value of the display image is increased relative to the signal value of a color other than blue, and when giving the viewer a calming effect, the display image A hue control unit that reduces the blue signal value of the color relative to the signal values of colors other than blue,
The display image further comprises a display unit for displaying an area where the pixel occupied blue of the display unit, and wherein the larger than other colors.

The hue control unit controls the hue by controlling the gradation characteristics of the display unit.

The color control unit may perform brightness control at the same time when the awakening effect or the calming effect is provided .

Further, the hue control unit, in varying the hue of the display image, wherein changing the fit colors in the range of 1.2 or less the amount of change of stepwise color difference within a certain time.

  The image display control device may be incorporated entirely in the image display device that displays an image, may be provided outside the image display device, or may be provided inside or outside the image display device. May be provided separately.

  According to the present invention, on the basis of the time information from the time output unit, the hue conversion unit displays the image by making the hue of the display image relatively high when the awakening effect is desired. It is possible to adjust the biological rhythm of the user of the display device including the display unit.

  In addition, when changing the hue of the display image, if the intensity of blue is relatively increased, the brightness of the display is increased, and if the intensity of blue is relatively decreased, the brightness is decreased to emit light along with the hue. By changing the amount, it is possible to adjust the biological rhythm more effectively.

  In addition, by changing the hue by changing the output level of the video signal, it is possible to adjust the biological rhythm in various devices. For example, by installing software that changes the video signal in an information processing device, it is easy to change the hue. The display unit can adjust the biological rhythm.

  In addition, by changing the hue step by step within a color difference of 1.2 or less, it is possible to change the hue so as not to make it difficult for the user to see by changing the hue according to the user's color adaptation.

  Further, when changing the hue of the image displayed on the display unit, the biological rhythm can be adjusted without limiting the gradation of the display unit by changing the light emission intensity of the light source of the light emitting unit.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. A first embodiment showing a display device using an image display control device according to the present invention will be described with reference to FIG. The display device 101 is a television receiver, and displays a display unit 104 that displays information, a video signal output unit 102 that outputs a video signal to be displayed on the display unit 104, and changes the color of a video displayed on the display device 101. The video signal conversion unit 103, a time output unit 105 that outputs time information, and a pattern storage unit 106 that stores how to change the video signal according to the time information. An image display control device 107 according to the present invention includes a video signal conversion unit 103 which is a hue control unit, and a pattern storage unit 106.

  First, a video signal to be displayed on the display unit 104 is sent from the antenna line to the video signal output unit 102, and the video signal is output to the video signal conversion unit 103. At that time, time information is sent from the time output unit 105 to the pattern storage unit 106. In the pattern storage unit 106, several patterns are set in advance. The pattern storage unit 106 refers to the currently selected pattern based on the time information, and outputs a signal indicating how to convert the video signal to the video signal conversion unit 103. The video signal conversion unit 103 converts the video signal in accordance with the output from the pattern storage unit 106, and the converted signal is sent to the display unit 104 to display the video.

  For example, 6:00 to 18:00 is defined as daytime, and after 18:00 to 6:00 is defined as nighttime. During the day from 6 o'clock to 18 o'clock, the melatonin is suppressed and the awakening period in which the awakening effect is obtained, and at night, the melatonin suppressing effect is reduced as much as possible to prevent the influence on sleep. FIG. 2 is a flowchart of image display processing according to the first embodiment of the present invention.

  First, a video signal is output from the video signal output unit 102. At this time, the pattern storage unit 106 obtains time information from the time output unit 105 (step S1). As shown in FIG. 3, the main wavelength is around 464 nm as a maximum, and light having a wavelength in the vicinity has an effect of suppressing melatonin. As shown in FIG. 4, the main wavelength is a white point with x and y coordinates (x, y) = (1/3, 1/3) in the XYZ color system for the light source color, and from the light source. A straight line connecting the chromaticity points F of the emitted light represents the wavelength of the monochromatic light stimulus at the point D that intersects the spectrum locus. In FIG. 4, the horizontal axis represents x, the vertical axis represents y, and a curve represented by a thick line represents a spectrum locus, and each point on the locus represents the wavelength of monochromatic light stimulation. By controlling the shade of blue, which is a wavelength near the melatonin-suppressing effect shown in FIG. 3, it is possible to adjust the suppression of melatonin, and the biological rhythm can be adjusted by the display device 101. Therefore, the pattern storage unit 106 determines whether or not the current time is daytime based on the time information of the time output unit 105 (step S2). If the current time is during the day, a pattern that increases the bluishness of the video signal and obtains a melatonin suppression effect is output to the video signal converter 103 (step S3). If it is nighttime instead of daytime, a pattern that reduces blueness and prevents the influence on sleep is output to the video signal converter 103 (step S4). The video signal converter 103 converts the RGB values of the video signal according to the pattern output. The RGB value of the video signal is represented by 8 bits for each component, and is given as a total of 256 numerical values from 0 to 255 according to the brightness. For example, during daytime, increase the blue signal value and decrease at night.

  An example of conversion at this time is shown in FIG. Consider a case where the video signal value of an input image is 150 for all of R, G, and B. If the intensity of blue is changed by 20%, as shown in FIG. 5 (a) during the day, the blue signal value is increased by 20% to 180, and at night, as shown in FIG. 5 (b). Decrease by 20 to 120. By performing such conversion, the blueness of the video signal is changed and output to the display unit 104. Thereby, the user can adjust the biological rhythm by using the television as usual without being particularly aware of the adjustment of the hue. A display device such as a television has a great influence because it directly sees light unlike illumination. In addition, it is effective to adjust the biological rhythm in a display device such as a television because a large amount of time is spent in front of the television or display on a daily basis.

Also, instead of changing the intensity of blue as shown in Fig. 6, during the day, the intensity of green and red other than blue is reduced by 20% as shown in Fig. 6 (a). For example, it may be increased by 20% as shown in FIG.
FIG. 7 shows changes in the chromaticity diagram when the video signal is changed as shown in FIGS. Assume that the correlated color temperature is D65 when the RGB values in the original signal are all 150. The color temperature is used to represent the color of light, and when it is on the black body radiation locus on the chromaticity diagram, it is called the color temperature, and when it deviates from the locus, it is called the correlated color temperature. As shown in FIG. 7, the correlated color temperature 6500K has many points on the chromaticity diagram. In particular, an average daylight color including an ultraviolet part having a correlated color temperature of about 6500K, called D65, defined by the International Commission on Illumination (CIE) is often used as a reference in televisions, monitors and the like. The higher the color temperature, the more bluish, and the lower the color temperature, the more reddish. On the chromaticity diagram, as shown in FIG. 7, when the bluish color is strengthened as shown in FIG. 5 and FIG. 6 (a), the direction is A, and when the bluish color is weakened as shown in (b), B is shown. The color will shift in the direction of. The horizontal axis in FIG. 7 represents x of the xy chromaticity coordinates, and the vertical axis represents y. The triangle indicated by the solid line in the figure represents the color reproduction range of sRGB, which is an international standard.

  Note that the rate of change in the blue signal value in FIGS. 5 and 6 is not limited to 20%, and the rate may be increased or decreased. Further, the signal value may be changed by a constant value such as 10 or 20 instead of being changed at a rate. When obtaining the awakening effect, as shown in FIG. 5 (a), the absolute value of the brightness may be increased and the bluishness may be increased. As shown in FIG. In particular, blue may be strengthened. The same is true for calming. In addition, the original video signal value is not limited to 150, and if it is 8 bits, there are various signal values from 0 to 255 for each color, and if the gradation is expressed with more or less bits, depending on it Signal value. Here, the original video signal values are all 150, that is, the correlated color temperature when the RGB signal values are set to the same ratio is 6500K. However, the video signal is not limited to 150 and takes various values, and the values are not the same ratio. The color temperature may be higher or lower. For example, there are various cases such as C light source and D50 defined by CIE. Further, the television may be a display such as a CRT, a liquid crystal television, a plasma display or an EL display. Regarding the method of changing blue, here it is strong during the day and weak at night, but the blue is increased during the day, while the signal value is not controlled at night and the normal state is set, or vice versa. It is also possible to control such that it is usually weak during the day and weak at night. That is, the intensity of blue may be relative. The time is not limited to Japan, but may be based on overseas time. In FIG. 1, all the components are included in the display device. However, for example, the time output unit 105 may be outside, and not all may be configured integrally.

(Embodiment 2)
With reference to FIG. 8, Embodiment 2 which shows the display apparatus and control apparatus using the image display control apparatus concerning this invention is demonstrated. The display device 111 is a liquid crystal monitor, and includes a display unit 104. The control device 201 is a personal computer, and a video signal output unit 102 that outputs a video signal to be displayed on the display device 111, and a hue that changes the hue of the video to be displayed. A video signal conversion unit 103 as a control unit, a time output unit 105 that outputs time information, a pattern storage unit 106 that stores how to change the video signal according to the time information, and sets the pattern And a pattern setting unit 202. The image display control device 117 according to the present invention includes a video signal conversion unit 103 that is a hue control unit, a pattern storage unit 106, and a pattern setting unit 202.

  First, the user uses the pattern setting unit 202 in advance to set a pattern according to his / her life rhythm and store it in the pattern storage unit 106. A video output signal to be displayed on the display device 111 is output from the video signal output unit 102. At this time, the pattern storage unit 106 obtains time information from the time output unit 105, and sends a signal indicating how to change the video signal according to the stored pattern according to the current time to the video signal conversion unit 103. Output. The video signal conversion unit 103 converts the video signal and changes the color of the image according to the signal. The video signal whose hue has been changed is sent to the display device 111 to display the video.

  The time zone in which melatonin is suppressed and the effect of awakening is obtained is defined as the awakening period, and the time zone in which the melatonin suppression effect such as before sleep is suppressed is defined as the calm period. For example, assuming that the user of the display device wakes up at 7:00 am every day and goes to bed at midnight, the waking period is from 7:00 am to about 9:00 pm after waking up, and after 9:00 pm, which is before sleep. In the calm period, the user makes settings through the pattern setting unit 202 inside the personal computer. Setting can be made easily by using a personal computer.

FIG. 9 is a flowchart of image display processing according to the second embodiment of the present invention.
First, the pattern storage unit 106 obtains time information from the time output unit 105 (step S11). Then, the user selects a desired pattern table from a plurality of pattern tables set by himself / herself, and the pattern storage unit 106 refers to the selected pattern table (step S12). While following the setting of the pattern table, the pattern storage unit 106 determines whether or not the current time is set to the awakening period (step S13). When the current time is 8:00 am, it is an awakening period, and the pattern storage unit 106 outputs a signal for increasing the blueness of the display image (step S14). When the current time is 10:00 pm, since it is a calm period, a signal for reducing the blueness of the display image is output (step S15). The video signal conversion unit 103 receives the signal from the pattern storage unit 106 and converts the RGB value of the video signal.

  FIG. 10 is an example of signal conversion. FIG. 10A shows an example of signal conversion during the awakening period, and the B signal value is increased in order to increase blueness. At that time, in order to enhance the effect, the signal values of R and G are decreased so that the blueness becomes stronger. FIG. 10B shows an example of signal conversion during the calm period, in which the B signal value is decreased in order to weaken blueness, and at the same time the R and G signal values are increased in order to enhance the effect.

  In addition to the examples given here, there are various pattern examples depending on the living environment of the user. FIG. 11 is an example of these patterns. When the user is working late at night, setting as in pattern 2 makes it possible to adjust the biological rhythm by setting the daytime to the calm period. Not only these patterns but various patterns can be set and selected by each person, and patterns stored in advance can be selected. In FIG. 11, the setting is made every two hours, but it can be set more finely. At that time, it is displayed on the display screen so that it is easy for the user to know whether the current situation is changing to a stronger shade of blue so as to obtain an awakening effect, or whether it is a weaker shade of blue so as not to disturb sleep Or a lamp using an LED (light emitting diode) or the like is provided to a display device or a connected device that outputs a video signal, and notification is made according to the lighting state.

  Here, the display device 111 is a liquid crystal monitor, but there are various devices such as a CRT and an EL display in addition to the liquid crystal. In addition to the case of a personal computer and a monitor, for example, a recording device such as a BS tuner, a DVD recorder, or a VTR may be used as a control device by connecting to a television as the display device 111.

(Embodiment 3)
With reference to FIG. 12, Embodiment 3 which shows the image display system using the image display control apparatus concerning this invention is demonstrated. This image display system includes a display device 121, a video signal output unit 102 that outputs a video signal to be displayed on the display device 121, a time output unit 105 that outputs time information, and how to display video according to the time information. The pattern storage unit 106 stores whether to change the signal. The display device 121 includes a display unit 104 that displays an image, and a display unit hue control unit 301 that changes the hue of the display unit 104. The image display control device according to the present invention includes a pattern storage unit 106 and a display unit hue control unit 301.

  First, a video signal to be displayed on the display unit 104 is output from the video signal output unit 102. At that time, time information is sent from the time output unit 105 to the pattern storage unit 106. In the pattern storage unit 106, several patterns are stored in advance. The pattern storage unit 106 refers to the currently selected pattern based on the time information, and outputs a signal indicating how to change the color of the video to the color control unit 301 of the display device 121. The hue control unit 301 converts the hue of the display device 121 according to the output from the pattern storage unit 106, sends a signal to the display unit 104, and displays an image.

  For example, the awakening period is from 7 am to 9 pm and the calming period is from 9 pm. When the current time is 8:00 am, it becomes an awakening period, so the pattern storage unit 106 outputs a signal to the hue control unit 301 so as to increase the blueness of the display device 121. When the current time is 10:00 pm, since it is a calm period, a signal is output so as to reduce the blueness of the display device 121. In response to the signal from the pattern storage unit 106, the hue control unit 301 changes the hue of the display unit 104 itself. Thereby, the display image becomes a bluish image in the awakening period, and melatonin is suppressed and the effect of awakening is obtained. Moreover, the suppression effect of melatonin is suppressed during the calm period, adverse effects on sleep can be prevented, and the biological rhythm can be adjusted.

  There are the following methods for the hue control unit 301 to change the hue of the display device 121. One is to use the voltage versus transmittance characteristics of the liquid crystal when the display device is a liquid crystal display device. FIG. 13 shows a voltage-transmittance curve of the liquid crystal, where the horizontal axis represents voltage and the vertical axis represents transmittance. Further, the graph of the figure shows the characteristics in normally black, which is in a dark state when no voltage is applied. When the range A shown in FIG. 13 is used as a gradation, the transmittance is 0.10 when the video signal value is 0, and the transmittance is 0.50 when the video signal value is 255. On the other hand, using the range B in the figure, the transmittance is 0.00 when the video signal value is 0, and the transmittance is 0.40 when the signal value is 255. Therefore, by assigning the range of A as gradations in the wakefulness period to the blue signal value, and using the range of B in the quiescent period, blue is strong in the wakefulness period and blue in the quiescent period. It can be weakened.

  As another method, there is a method in which the hue control unit 301 has an output table corresponding to a video signal. For example, in the awakening period, when a signal having a video signal value of 150 is sent to the display device, the hue control unit 301 refers to an output table that increases the blue output, increases the signal value by 10%, In normal times, the video signal is output at an intensity corresponding to the video signal value 165. The biological rhythm can be adjusted by using an output table that is weakened by 10% during the calm period.

  In this way, by changing the hue by the hue control unit on the display device side, even if there is no function to change the video signal on the output device side that outputs the video signal value, the hue control can be performed only on the display device side. It becomes possible.

  In addition, when performing such control, if the shade of blue is strengthened in the awakening period, the luminance of the display device 121 is increased, and conversely, the luminance is suppressed in the calm period compared to the awakening period, thereby reducing the light intensity. When you want to influence, it emits a lot of light, and when you want to suppress it, the amount of light emission is reduced, and the effect on the biological rhythm is stronger as the amount of emitted light increases, so the biological rhythm can be adjusted more effectively. It becomes possible.

(Embodiment 4)
With reference to FIG. 14, Embodiment 4 which shows the image display system using the image display control apparatus concerning this invention is demonstrated. This image display system includes a display device 121, a video signal output unit 102 that outputs a video signal to be displayed on the display device 121, a video signal conversion unit 103 that changes the color of the video displayed on the display device 121, and time information. A time output unit 105 for outputting and a pattern storage unit 106 for storing how to change the video signal according to the time information are configured. The display device 121 includes a display unit 104 that displays an image, and a display unit hue control unit 301 that changes the hue of the display unit 104. The image display control device 317 according to the present invention includes a pattern storage unit 106, and a hue control unit 318 including a video signal conversion unit 103 and a display unit hue control unit.

  First, a video signal to be displayed on the display device 121 is output from the video signal output unit 102. At that time, time information is sent from the time output unit 105 to the pattern storage unit 106. In the pattern storage unit 106, several patterns are set in advance. The pattern storage unit 106 refers to the currently selected pattern based on the time information, changes the color of the display device 121, and a signal indicating how to convert the video signal to the video signal conversion unit 103. Whether or not it is to be output to the hue control unit 301 of the display device 121. The video signal conversion unit 103 converts the hue of the video signal according to the output from the pattern storage unit 106, and the converted signal is sent to the display device 121. At the same time, the hue control unit 301 changes the hue of the display device 121 and displays an image corresponding to the pattern.

  FIG. 15 is a flowchart of image display processing according to the fourth embodiment of the present invention. The pattern storage unit 106 obtains time information from the time output unit 105 (step S21). Then, the user selects a desired pattern table from the plurality of pattern tables set by himself / herself, and the pattern storage unit 106 refers to the selected pattern table (step S22). While following the setting of the pattern table, the pattern storage unit 106 determines whether or not the current time is set to the awakening period (step S23). For example, the awakening period is from 7 am to 9 pm and the calming period is from 9 pm. When the current time obtained from the time output unit 105 is 8:00 am, it becomes an awakening period, so the pattern storage unit 106 outputs a signal to the tint control unit 301 so as to increase the blueness of the display device (step) S24). At the same time, a signal is sent to the video signal converter 103 to increase the intensity of colors other than blue at the black level (step S25).

  With such a process, when blue is strengthened so as to adjust the biological rhythm, the color balance is lost and an image with a strong blue becomes difficult to see. However, considering that black has little or no emission wavelength component, it is difficult to affect the biological rhythm, so only the black level of the display related to the color close to black in the image for each frame. By increasing the intensity of colors other than blue, the area close to black will not be bluish. In this way, it is possible to prevent the color from becoming sharp and difficult to see. In addition, by increasing the intensity of only the black level, it is possible to minimize the influence on the biological rhythm caused by colors other than blue.

  When the color of the image displayed on the display device 121 is changed, if the color is changed suddenly, it becomes difficult for the user to see. Therefore, according to the classification defined by ASTM (American Society for Testing Materials), when the color difference is judged side by side, it is a level that can discriminate the color difference. To prevent the user from becoming difficult to see. For example, it may be changed stepwise over 5 minutes. The change amount of the color difference is more ideally within 0.6 which is a practical tolerance limit.

  When the current time is 10:00 pm, since it is a calm period, a signal is output to the hue control unit 301 so as to reduce the blueness of the display device (step S26). At the same time, the pattern storage unit 106 sends a signal to the video signal conversion unit 103 to increase the intensity of blue only at the black level (step S27).

  In order to adjust the biological rhythm, it is necessary to weaken the intensity of blue, but the color balance of the image is lost and it becomes difficult to see. Therefore, by increasing the intensity of blue to a certain extent around the black part of the image, which has little effect on the living body, the intensity of blue is increased only at the black level so that the color is sharp and easy to see. As a result, the blue color falls as a whole to prevent adverse effects on sleep, and by increasing the intensity of blue only at the black level, it is possible to make the color as easy to see as possible while minimizing the difficulty of viewing the image. It becomes.

  In this embodiment, when changing the blue intensity of the display image, it is performed by the hue control unit 301. However, this may be performed by changing the image signal, and the black level is adjusted by the image signal. However, this may be performed on the display device side. Further, instead of changing the intensity of blue, the intensity of colors other than blue may be changed to relatively change the intensity of blue. For example, in the awakening period, the red and green intensities of the video signal may be lowered at the white level, but not changed at the black level, or may be raised. FIG. 16 shows the relationship between the white level and the black level in red at this time. The horizontal axis of the figure represents the red (R) input signal value, and the vertical axis represents the output signal value. Here, in the case of the minimum value and the maximum value of the video signal, it is assumed that 20% of the maximum gradation value 255 is changed. For example, when the red video signal value in a certain video is 0, it is converted to 51 to increase the intensity of the black level as shown in FIG. The intensity is lowered as in 16B, and the signal value is output as 204. For the values in the meantime, conversion is performed according to a straight line shown in the figure corresponding to the amount of change between the maximum value and the minimum value. This lowers the white level intensity while increasing the black level intensity. Here, the method of change is a straight line, but it is not limited to a straight line, but there are various ways of change such as an inverse proportion, a quadratic curve, or even a straight line that is discontinuous depending on the location.

FIG. 17 shows combinations of changes in the intensity of each color when control is performed at the black level and the white level. (A) shows the case of an awakening period, and is a case where bluish is strengthened, and (b) is a case where bluish is weakened in a calm period. In the case of increasing blueness, as shown in (a), a combination of four modes in the black level region where the video signal value is lower than the intermediate value of the maximum value and three modes in the high white level region. For example, for the video signal value of each of the three colors, at a white level higher than the middle of the maximum value, in A5 mode, the signal value is increased by 10% for blue, and red and green are not changed. There is a pattern in which no color is changed in the A1 mode at a low black level. More optimal control can be performed by combining optimal modes in the low and high signal values according to the situation at that time. For example, when the image to be displayed is originally a reddish image on the entire screen, the A6 mode is selected in order to increase the bluishness in the white level region, and A1 is selected in the black level region and is not particularly changed. It is possible to effectively adjust the biological rhythm while adding color sharpness. (B) is a case where the bluish color is weakened. There are also 12 combinations of four modes B1 to B4 and B5 to B7.
Note that the amount of change in the signal value in FIG. 17 is not limited to 10%, but may be large or small, such as 5% or 20%.

(Embodiment 5)
With reference to FIG. 18, Embodiment 5 which shows the image display system using the image display control apparatus concerning this invention is demonstrated. This image display system includes a display device 131, a video signal output unit 102 that outputs a video signal to be displayed on the display device 131, a video signal conversion unit 103 that changes the color of the video displayed on the display device 131, and time information. A time output unit 105 for outputting and a pattern storage unit 106 for storing how to change the video signal according to the time information are configured. The display device 131 includes a liquid crystal panel 401 that displays an image, a light guide plate 402 that irradiates the liquid crystal panel 401 from the back surface, a light source unit 400 that makes light incident on the light guide plate, and a light source control unit 406 that controls the light source unit 400. Composed. The light source unit 400 of the display device 131 includes a red LED 403, a green LED 404, and an LED 405 having a dominant wavelength of 464 nm. The image display control device 407 according to the present invention includes a pattern storage unit 106, a video signal conversion unit 103, and a hue control unit 408 including the video signal conversion unit 103 and the light source control unit 406.

  First, a video signal to be displayed on the display device 131 is output from the video signal output unit 102. At that time, time information is sent from the time output unit 105 to the pattern storage unit 106. In the pattern storage unit 106, several patterns are set in advance. The pattern storage unit 106 refers to the currently selected pattern on the basis of the time information, changes a signal indicating how to convert the video signal to the video signal conversion unit 103, and how to change the color of the display device. Is output to the light source control unit 406 of the display device 131. The video signal conversion unit 103 converts the hue of the video signal in accordance with the output from the pattern storage unit 106, and the converted signal is sent to the liquid crystal panel 401. The light source control unit 406 displays an image corresponding to the pattern by changing the light emission intensity of each LED of the light source unit and changing the hue of the display device.

  For example, after starting to use the display, one hour is awakening, and the rest is intended to be calm. In the awake period, the pattern storage unit 106 outputs a signal to the light source control unit 406 so as to increase the blueness of the light source unit, according to the elapsed time from the start of use obtained from the time output unit 105. . In response to this signal, the light source control unit increases the light emission intensity of the LED 405 having the dominant wavelength at 464 nm of the light source unit, and the blueness of the light source unit increases. Since the LED 405 having a dominant wavelength of 464 nm is close to the dominant wavelength at which the melatonin suppression effect is strongest, the biological rhythm can be adjusted more effectively by using this as a blue light source.

  In addition, when the intensity of blue is controlled by a video signal, there is a problem that the gradation is limited. However, it is possible to prevent the gradation from being reduced by changing the intensity of the light source. . At the same time as changing the hue of the light source 400, a signal is sent to the video signal converter 103 to increase the intensity of colors other than blue at the black level. When blue is strengthened so as to adjust the biological rhythm, the color balance is lost, and the image becomes difficult to see because the blue is strong. However, by increasing the intensity of colors other than blue only at a black level related to a color close to black that hardly affects biological rhythm, it is possible to minimize color sharpness and difficulty in viewing. Further, by increasing the intensity of only the black level, the influence on the biological rhythm caused by colors other than blue can be minimized.

In this embodiment, when changing the blue intensity of the display image, only the awakening period is considered. However, when the time is calm and the blueness is weakened, the intensity of the LED 405 is similarly controlled by the light source control unit 406. It will change the blueness of the light emitting part. Although the light source is an LED here, a cold cathode tube or an EL may be used. Further, here, the elapsed time is within 1 hour, but the awakening period is not limited to 1 hour, but may be 2 hours, 3 hours, or more, and the user can freely select. Not only the elapsed time from the start of use, but also from 1 hour to 2 hours after the start of use may be the awakening period. Although the elapsed time from the start of use of the display is used here, the elapsed time from the start of use of the control device may be used when the display device and the control device are separated as in the previous embodiments. In addition, the time output unit may include original time information of a 24-hour period with a certain time as a reference, and may include a control pattern using the time information.
In FIG. 18, the size of each member in the display unit is simply described for the sake of simplicity, and the size relationship is exaggerated and is different from the actual size. Further, the main wavelength of the LED 405 may be anything from 445 nm to 480 nm.

(Embodiment 6)
With reference to FIG. 19, Embodiment 6 which shows the image display system using the image display control apparatus concerning this invention is demonstrated. FIG. 18A shows the configuration of one pixel of the display portion 507. The display unit 507 is an organic EL (Electro Luminescence) display of a self-luminous display, and includes a glass substrate 501, an anode 502, an organic layer 503 that emits red light, an organic layer 504 that emits green light, and light having a dominant wavelength of 464 nm. The organic layer 505 that emits light and the cathode 506 are used as one pixel. As shown in FIG. 19B, this image display apparatus includes a display unit 507, a video signal output unit 102, a video signal conversion unit 103, a time output unit 105, and a pattern memory, each having FIG. 18A as one pixel. The unit 106 and the light source control unit 406 are provided. An image display control device 517 according to the present invention includes a pattern storage unit 106, a video signal conversion unit 103, and a hue control unit 518 including a video signal conversion unit 103 and a light source control unit 406.

  For example, the awakening period is from 7 am to 9 pm and the calming period is from 9 pm. In accordance with the current time obtained from the time output unit 105, the pattern storage unit 106 continuously changes the intensity of blue as shown in FIG. It is assumed that the organic layer is PWM (Pulse Width Modulation) controlled and the light emission intensity is controlled by the duty ratio. In FIG. 20, the horizontal axis represents time, and the vertical axis represents the maximum value of Duty, which is the emission intensity of the organic layer 505. If the current time is the awakening period, the pattern storage unit 106 outputs a signal to the light source control unit 406 to change the bluishness of the light source unit according to the emission intensity shown in FIG. In response to this signal, the light source control unit increases the maximum duty ratio of the organic layer 505 having the main wavelength at 464 nm of the light source unit to increase the emission intensity, and the blueness of the light source unit is increased. Since the organic layer 505 having a dominant wavelength of 464 nm is close to the dominant wavelength at which the melatonin suppression effect appears most strongly, it is possible to adjust the biological rhythm more effectively by using this as a blue light source. Similarly, in the calm period, the emission intensity of the organic layer 505 is weakened according to time. Thus, by changing continuously, it becomes possible to arrange a biological rhythm more effectively without making the user aware of the change in color. There are various cases in which the pattern to be continuously changed is intensified in blue when the sun is strong according to the movement of the sun in each season, or is changed according to the lifestyle pattern of the user.

  In FIG. 19, since the size of each member is simple, the size relationship is exaggerated and is different from the actual size. In addition, although the organic EL display having the light emitting layers of three colors is used here, it may be a combination of white and a color filter, or may be a multi-primary color. Further, a self-luminous display such as an inorganic EL display, a field emission display, or an LED display may be used.

  In FIG. 20, the method of changing the light emission intensity is PWM control. However, there is a method of controlling with a current or voltage in a self-luminous display. The change is shown by a straight line here, but there are various patterns such as control according to the quadratic curve, its location, and the light emission intensity of the sun in the natural world at that time. The duty range is not limited to the range of 20% to 90% shown here, and both the lower and upper limits may be larger or smaller.

(Embodiment 7)
Embodiment 7 which shows the display apparatus using the image display control apparatus concerning this invention with reference to FIG. 21 is demonstrated. The display device 601 is a television receiver, and includes a display unit 104 that displays information, a video signal output unit 102 that outputs a video signal, and a video signal comparison unit 602 that compares the size of the video signal for each color. A video signal conversion unit 103 that changes the color of the video displayed on the display device 601, a time output unit 105 that outputs time information, and a pattern storage unit that stores how the video signal is changed according to the time information 106. The image display control device 607 according to the present invention includes a video signal comparison unit 602, a video signal conversion unit 103 that is a hue control unit, and a pattern storage unit 106.

  First, a video signal to be displayed on the display unit 104 is sent from the antenna line to the video signal output unit 102, and the video signal is output to the video signal comparison unit 602. The video signal comparison unit 602 compares the RGB signal values in each video signal, determines which point on the screen to convert the signal value, and converts the information along with the original video signal into the video signal. Output to the unit 103. At that time, time information is sent from the time output unit 105 to the pattern storage unit 106. In the pattern storage unit 106, several patterns are set in advance. The pattern storage unit 106 refers to the currently selected pattern based on the time information, and outputs a signal indicating how to convert the video signal to the video signal conversion unit 103. The video signal conversion unit 103 converts the video signal according to the output from the pattern storage unit 106 and the output from the video signal comparison unit, and the converted signal is sent to the display unit 104 to display the video.

  For example, melatonin is suppressed from 6 o'clock to 10 o'clock, the awakening period in which the effect of awakening is obtained, the normal period in which display is performed in a normal color from 10 o'clock to 20 o'clock, and the inhibitory effect of melatonin from 20 o'clock to 6 o'clock Decrease as much as possible, and set a quiet period to prevent effects on sleep. FIG. 22 is a flowchart of image display processing in the video signal conversion unit 103 according to the seventh embodiment of the present invention.

  First, a video signal is output from the video signal output unit 102 and sent to the video signal comparison unit 602. The video signal comparison unit 602 compares the video signal values of red (R), green (G), and blue (B) in each video signal. If the blue signal value is the largest, it is designated as a part for color conversion, and if not, the conversion is not performed. Then, information indicating whether or not to perform the conversion and the video signal sent from the video signal output unit are output to the video signal conversion unit 103. At this time, the pattern storage unit 106 obtains time information from the time output unit 105 (step S31). The pattern storage unit 106 determines whether the current time is an awakening period according to the time information (step 32). In the case of the awakening period, the B signal value is increased in order to increase the bluishness of the portion designated by the information sent from the video signal comparison unit 602 and having the B signal value larger than RG (step). 33). When it is not the awakening period, it is determined whether or not it is the calming period (step 34). If it is a calm period, the B signal value is decreased for a portion where the B signal value is larger than that of multiple colors, and the bluish color is weakened (step 35).

  In this way, by changing the bluishness only on the screen where the B signal value is larger than RG in the original video signal, the biological rhythm can be adjusted while maintaining the natural color as much as possible. It becomes possible. For example, in the awakening period, when the RGB signal values are R: 150, G: 0, and B: 0, this portion is pure red. At this time, when the signal value of B is increased, the color is changed due to the mixing of blue, resulting in a dull color that loses clarity. Therefore, for such a portion, the signal is output as it is without increasing B. On the other hand, B is increased in places where the B signal value is the largest, such as R: 100, G: 100, and B: 150. As described above, when the blue is increased only in the place where the signal value of B is the largest, since this portion is originally bluish, even if the blue is increased, the color change is small and the unnaturalness is small. In addition, since the place where the signal value of B is larger has a stronger influence on the biological rhythm, the biological rhythm can be adjusted by controlling only this portion. Therefore, it is possible to obtain a relatively natural hue while adjusting the biological rhythm.

  Similarly, in the calm period, the B signal value is decreased only in the portion where the B signal value is large. Also in this case, the color change is smaller when only the portion with a strong blueness with a large B signal value is reduced. In the normal period, signal value conversion is not particularly performed.

  In addition, when the signal value is converted, it is possible to maintain a more natural appearance by changing the rate of change according to the signal value. When comparing each of the RGB signal values and selecting a portion where the B signal value is large, the difference between the B signal value and the larger one of the R and G signal values is calculated, and this difference is large. The amount of change in the B signal value is increased. As shown in FIG. 23, the B signal value is changed as the difference between the B signal value and the larger one of R and G is larger. The horizontal axis indicates the difference between the B signal value and the larger signal value of R and G, and the vertical axis indicates the amount of change in B. A specific example will be described with reference to FIG. The left side is the original video signal, and the right side is the changed signal value. In the awakening period, if the signal value is as shown in FIG. 24A, the difference between the B signal value and 150 and the R or G signal value 30 is 120. Is increased by 30 which is the maximum value to 180. In the case of the signal values shown in FIG. 24B, the difference between the B signal value 150 and the G signal value 130 is 20, so the B signal value is increased by 5 to 155.

  Similarly, in the calm period, the B signal value is decreased by 30 as shown in FIG. If it is the signal value shown in (d), the B signal value is decreased by 5.

  As a result, when the ratio of signal values other than B is large, the change in hue is large when blue is changed. However, if the ratio of the signal value of B is large, the change in color is small and the change in saturation is small. Since it can only be seen, it is possible to adjust the biological rhythm while displaying it close to the original image.

  In this embodiment, the signal value is converted when the signal value of B is the highest. However, a separate reference may be provided to increase the portion where blue is changed. For example, the signal value of B is larger than the value obtained by subtracting 20 from the largest signal value in RG. Thereby, the part which changes the intensity of blue increases, and it becomes higher compared with the case where only the part where the adjustment effect of a biological rhythm is the highest is changed. There is also a method for determining whether or not to perform conversion at a ratio of B to the sum of the R and G signal values. Further, when changing the amount of change of the signal value, 30 is changed at the maximum here, but this maximum value is not limited to 30 and can take various values such as 50. Also, the method of changing the amount of change shown in FIG. 23 is not limited to the linear one shown here, and there are various methods such as determining the minimum and maximum and changing them in a quadratic curve according to the signal value. Here, B is changed when the difference is between 0 and 120, but there are various ranges such as changing when B is between 20 and 100, for example. In addition, although a television is used here, a mobile phone having a color display, a PDA, or the like may be used.

(Embodiment 8)
With reference to FIG. 25, Embodiment 8 which shows the image display system using the image display control apparatus concerning this invention is demonstrated. FIG. 25A shows the configuration of one pixel of the display portion 707. The display unit 707 is an organic EL (Electro Luminescence) display that is a self-luminous display, and includes a glass substrate 501, an anode 502, an organic layer 503 that emits red light, an organic layer 504 that emits green light, and light having a dominant wavelength of 464 nm. An organic layer 505 that emits light, an organic layer 701 that emits light having a wavelength of 464 nm, and a cathode 506 are used as one pixel. As shown in FIG. 25 (b), this image display apparatus includes a display unit 707, a video signal output unit 102, a video signal conversion unit 103, a time output unit 105, and a pattern memory, each having FIG. 25 (a) as one pixel. The unit 106 and the light source control unit 406 are provided. An image display control device 517 according to the present invention includes a pattern storage unit 106, a video signal conversion unit 103, and a hue control unit 518 including a video signal conversion unit 103 and a light source control unit 406.

  For example, it is assumed that the image to be displayed is a landscape image such as Asahi and includes content information indicating that it is desired to have an awakening effect. In that case, the organic layer 701 is also used together with the organic layer 505 that emits light having a dominant wavelength of 464 nm. By having two pixels having the same main wavelength, the number of gradations is doubled, so that the biological rhythm can be adjusted more effectively according to the video signal value. For example, when only the organic layer 505 is used, there is a signal with a B signal value of 240. At this time, when the effect of awakening is given, even if the signal value of B is increased by 30 and displayed, the signal value is up to 255, so it cannot be increased to 255 or more. However, at this time, the organic layer 701 also emits light, and by adjusting the intensity of 701 so that the intensity of blue is assumed when the signal value is 270, 464 nm can be increased from that of one pixel. Thus, the influence on the biological rhythm can be further increased. In addition to the auxiliary use of the organic layer 701, the organic layers 505 and 701 emit light with the same intensity according to the signal value only during the awakening period as shown in FIG. It is possible to increase blue to double the intensity. In FIG. 26, the horizontal axis indicates the B signal value, and the vertical axis indicates the blue light emission intensity when the blue intensity when only the organic layer 505 emits light at the maximum is 100. No. No. 1 is the case where only the organic layer 505 is used. 2 shows the case where the organic layers 505 and 701 are caused to emit light simultaneously. According to this, no. It can be seen that it is possible to have twice as many gradations as when 1. By performing the conversion simultaneously with the conversion of the video signal as shown in the previous embodiment, it is possible to increase the biological rhythm adjustment effect. The strengths of the organic layers 505 and 701 are No. If the control is performed as shown in FIG. 3, the biological rhythm adjustment effect can be improved as compared with the case of the organic layer 505 alone, while suppressing only blue from protruding and becoming an image that is difficult to see. In addition, there is a usage method in which only the organic layer 505 is used when the signal value is small without using two at all, and the two are used together only at a place where the signal value of B is large, for example, when 200 is exceeded.

  In FIG. 25, the size of each member is simply written for exaggeration, and is different from the actual size. In addition, although it has two organic layers of 464 nm here, the gradation may be increased by increasing the area of one organic layer of 464 compared to other colors. Further, although the self-luminous type is described here, in the liquid crystal, the blue pixel may be enlarged or the area of the liquid crystal may be increased by two to increase the amount of transmitted blue light. Here, the three primary colors having red and green pixels in addition to blue are used, but blue may be controlled in the case of multiple primary colors having a larger number of colors.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and the invention can be obtained by appropriately combining technical means disclosed in different embodiments. Embodiments are also included in the technical scope of the present invention.

1 is a block diagram of a first embodiment showing a display device using an image display control device according to the present invention. It is a flowchart of the image display process in Embodiment 1 of this invention. It is a figure which shows the relationship between the wavelength in Embodiment 1 of this invention, and suppression of melatonin. It is a figure regarding the dominant wavelength and spectrum locus | trajectory of a light source. It is a figure which shows the blue signal conversion example in Embodiment 1 of this invention. It is a figure which shows the green and red signal conversion example in Embodiment 1 of this invention. It is a figure which shows the change on the chromaticity coordinate of a white part when changing the hue of blue in this invention. It is a block diagram of Embodiment 2 which shows the display apparatus and control apparatus using the image display control apparatus concerning this invention. It is a flowchart of the image display process in Embodiment 2 of this invention. It is a figure which shows the blue, green, and red signal conversion example in Embodiment 2 of this invention. It is a figure which shows the example of a pattern of the awakening period and a calming period in Embodiment 2 of this invention. It is a block diagram of Embodiment 3 which shows the image display system using the image display control apparatus concerning this invention. It is a figure which shows the voltage-transmittance characteristic in a liquid crystal. It is a block diagram of Embodiment 4 which shows the image display system using the image display control apparatus concerning this invention. It is a flowchart of the image display process in Embodiment 4 of this invention. It is a figure which shows the relationship between the white level and black level in red. It is a figure which shows the combination of the strength in the black level for each color, and a white level. It is a block diagram of Embodiment 5 which shows the image display system using the image display control apparatus concerning this invention. It is a block diagram of Embodiment 6 which shows the image display system using the image display control apparatus concerning this invention. It is a figure which shows the continuous change of the intensity | strength of blue in a display apparatus. It is a block diagram of Embodiment 7 which shows the image display system using the image display control apparatus concerning this invention. It is a flowchart of the image display process in Embodiment 7 of this invention. It is a figure which shows the difference of the signal value of blue and another color, and the variation | change_quantity of the blue signal value. It is a figure which shows the blue signal conversion example in Embodiment 7 of this invention. It is a block diagram of Embodiment 8 which shows the image display system using the image display control apparatus concerning this invention. It is a figure which shows the blue signal value and emitted light intensity in Embodiment 8 of this invention.

Explanation of symbols

101, 111, 121, 131, 601 Display device 102 Video signal output unit 103 Video signal conversion unit 104 Display unit 105 Time output unit 106 Pattern storage unit 201 Control device 202 Pattern setting unit 301 Color control unit 401 Liquid crystal panel 402 Light guide plate 403 Red LED
404 green LED
405 LED with a dominant wavelength of 464 nm
406 Light source controller 501 Glass substrate 502 Anode 503 Organic layer 504 emitting red light Organic layer 505 emitting green light Organic layer 506 emitting light having a dominant wavelength of 464 nm Cathode 507 Display unit 602 Video signal comparator 701 Main wavelength is 464 nm Organic layer 707 emitting light which is

Claims (8)

Oite the image display control device for controlling the color tone of the image displayed on the display unit,
When giving the viewer an awakening effect, the blue signal value of the display image is increased relative to the signal value of a color other than blue, and when giving the viewer a calming effect, the display image A hue control unit that reduces the blue signal value of the color relative to the signal values of colors other than blue ,
The hue control unit increases or decreases a blue signal value in a black level portion of a display image relative to a signal value of a color other than blue . In an image display control device that controls the hue of an image displayed on a display unit,
When giving the viewer an awakening effect, the blue signal value of the display image is increased relative to a signal value other than blue, and when giving the viewer a calming effect, the blue image value of the display image is increased. A hue control unit that reduces the signal value of the signal relative to the signal value of colors other than blue,
The hue control unit, in varying the hue of the display image, blue signal value images display control unit you characterized in that alter the tint only larger portion than the reference value. In an image display control device that controls the hue of an image displayed on a display unit,
Viewing the case of no effect of awakening for the listener relative increase the color signal values of other than blue signal values blue display image on the display in the case of no effect of calming for viewer image A hue control unit that reduces the blue signal value of the color relative to the signal values of colors other than blue,
The hue control unit, in varying the hue of the display image, blue images display control unit you characterized in that the signal value changes the tint only the color greater portion than the signal value other than blue. In an image display control device that controls the hue of an image displayed on a display unit,
When giving the viewer an awakening effect, the blue signal value of the display image is increased relative to the signal value of a color other than blue, and when giving the viewer a calming effect, the display image A hue control unit that reduces the blue signal value of the color relative to the signal values of colors other than blue,
When changing the hue of the display image, the hue control unit increases the amount of blue change as the ratio of the blue signal value increases with respect to the total of all signal values representing one pixel. images display control unit you wherein changing the shades. In an image display control device that controls the hue of an image displayed on a display unit,
When giving the viewer an awakening effect, the blue signal value of the display image is increased relative to the signal value of a color other than blue, and when giving the viewer a calming effect, the display image A hue control unit that reduces the blue signal value of the color relative to the signal values of colors other than blue,
Further comprising, an area which the pixels occupy blue of the display unit, images display control unit you being greater than the other color display unit for displaying the display image. The image display control apparatus according to claim 1, wherein the hue control unit controls the hue by performing gradation characteristic control of the display unit. 7. The image display control apparatus according to claim 1, wherein the hue control unit simultaneously performs luminance control when the awakening effect or the calming effect is provided. The hue control unit, in varying the hue of the display image, one of the claims 1 to 7, characterized in that changing the fit colors in the range of 1.2 or less the amount of change of stepwise color difference within a certain time the image display control device according to an item or.

Images