JP2009122367A - Image display device and image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image suitable to a user by suitably controlling the image to be displayed by an image display device and an environment wherein the image display device is installed. <P>SOLUTION: There are display modes adaptive to three kinds available, and one of them is selected (mode setting process). Consequently, video signal processing setting parameters are set and a video signal processing unit 12 operates in accordance with them (video signal processing process). At the same time, backlight setting parameters are set and a backlight circuit 18 and a backlight 17 operate in accordance with them (backlight control process). At the same time, indirect lighting setting parameters are set and an indirect lighting control circuit 20 and an indirect lighting light 19 operate (indirect lighting control process). An image based on a video signal output by the video signal processing unit 12 is displayed by a display means (display process). Through those operations, suitable images are displayed in accordance with kinds of contents. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image display device that displays an image using a video signal, and an image display method used therefor.

  For example, in an image display device such as a television receiver, the brightness, contrast, color tone, and the like of a displayed screen are appropriately controlled, and a good color image is displayed. These values can be adjusted by the user, and a function that can automatically adjust these values to optimum values is also used.

  On the other hand, for the user, the impression of the image displayed here is not determined only by the image on the television receiver. The impression greatly depends on the environment of the room where the television receiver is installed. In addition to the impression of the image, the environment of the room greatly affects the eye fatigue of the user. This environment is particularly affected by room lighting.

  For this reason, for example, Patent Document 1 describes a technique in which a neon tube is installed in a television receiver and the neon tube is used as indirect illumination. In this technique, when the user controls the television receiver, the illuminance and irradiation angle of the neon tube are controlled, and these are automatically controlled according to the operation of the television receiver. As a result, a color image better for the user could be obtained.

In addition, IFA (International Radio Exhibition Berlin) 2007 uses a technology (ambient / light technology) in which color LEDs are installed behind and around the screen of a television receiver and the degree of light emission is changed according to the display screen. The television receiver that was used is introduced. In this technique, for example, when the screen color is red, the peripheral light emission is red, and when the screen color is green, the peripheral light emission is green. By this operation, the displayed screen can be emphasized or the display screen can be enlarged, and the user can view the image with the same feeling as when viewing the image in a movie theater. That is, also in this technique, it was possible to obtain a color image favorable for the user by controlling the indirect illumination according to the image.
Japanese Patent Laid-Open No. 10-312160

  However, various color images are displayed, and the image display method described above is often not suitable. For example, the movement may be more important than the color of the image, as in sports broadcasts, but the movement may not be emphasized and the color close to nature may be emphasized unlike an image showing a landscape. . In the technique described in Patent Document 1 and the ambient light technique, the movement is emphasized in the former case, so that the user can enjoy more powerful force. Is felt as an extreme color. Also, if you keep watching intense motion on a bright screen all the time, it causes eye strain.

  Therefore, it has been difficult for the user to provide an optimal image by optimally controlling the image displayed on the image display device and the environment in which the image display device is installed.

  The present invention has been made in view of such problems, and an object thereof is to provide an invention that solves the above problems.

In order to solve the above problems, the present invention has the following configurations.
The image display apparatus of the present invention is an image display apparatus that displays an image based on the video signal by outputting the input video signal to the display means via the video signal processing means, and the periphery of the image display apparatus Indirect illumination means for emitting indirect illumination light for illuminating the display, and control means for determining a video signal processing setting parameter in the video signal processing means and an indirect illumination setting parameter in the indirect illumination means according to a display mode of the image It is characterized by that.
In the image display device of the present invention, the indirect illumination means is controlled at the same frequency as a frame rate in the output video signal.
In the image display device of the present invention, a double speed drive circuit that changes a frame rate in the output video signal is used, and the control means determines the frame rate according to the display mode of the image. .
In the image display device of the present invention, a backlight is used in the display unit, and the control unit sets a backlight setting parameter in the backlight.
In the image display device of the present invention, at least one of color temperature and luminance in the backlight is controlled by the backlight setting parameter.
In the image display device of the present invention, the backlight is controlled at the same frequency as a frame rate in the output video signal.
In the image display device of the present invention, the image on the display means is displayed by a liquid crystal panel.
In the image display device of the present invention, the backlight is also used for the indirect illumination means.
In the image display device of the present invention, a slit is provided around the backlight, and light emitted from the slit is used as the indirect illumination light.
In the image display device of the present invention, at least one of color temperature, luminance, and irradiation angle in the indirect illumination unit is controlled by the indirect illumination setting parameter.
In the image display device of the present invention, the video signal processing means includes at least one of YC separation processing, IP (interlace / progressive) conversion processing, and NR (noise reduction) processing.
The image display device of the present invention is characterized in that the video signal processing means sets that one of frame correlation processing and line correlation processing is used as the video signal processing setting parameter.
In the image display device of the present invention, the video signal processing means performs gamma correction of the video signal, and a gamma curve used for the gamma correction is set as the video signal processing setting parameter.
In the image display device of the present invention, a black insertion circuit for inserting a black signal between frames in the output video signal is used, and the control means determines whether or not the black signal is inserted depending on the display mode of the image. It is characterized by determining.
The image display device of the present invention includes a receiving unit that receives a digital television broadcast and extracts a television broadcast signal and EPG (Electric Program Guide) information, and the control unit is configured to extract the EPG information from the EPG information. The display mode is set.
The image display method of the present invention is an image display method for processing an input video signal to display an image based on the video signal and illuminating the periphery of the image with indirect illumination light emitted from an indirect illumination light. A mode setting step for setting the display mode of the image, a video signal processing step for processing the video signal using a video signal processing setting parameter determined by the display mode, and a video after the processing of the video signal A display step of displaying an image based on the signal; and an indirect illumination control step of controlling the light for indirect illumination using an indirect illumination setting parameter determined by the display mode.
The image display method of the present invention is characterized in that the indirect illumination light is controlled at the same frequency as a frame rate in the output video signal.
The image display method of the present invention is characterized in that a frame rate in the output video signal is set according to the display mode of the image.
In the image display method of the present invention, a backlight is used in the display step, and includes a backlight control step of controlling the backlight using a backlight setting parameter determined by the display mode. And
The image display method of the present invention is characterized in that at least one of color temperature and luminance in the backlight is controlled by the backlight setting parameter.
The image display method of the present invention is characterized in that the backlight is controlled at the same frequency as a frame rate in the output video signal.
The image display method of the present invention is characterized in that, in the display step, the image is displayed by a liquid crystal panel.
The image display method of the present invention is characterized in that light emitted from the backlight is used as the indirect illumination light.
In the image display method of the present invention, a slit is provided around the backlight, and light emitted from the slit is used as the indirect illumination light.
The image display method of the present invention is characterized in that at least one of color temperature, luminance, and irradiation angle of the indirect illumination light is controlled by the indirect illumination setting parameter.
The image display method of the present invention is characterized in that at least one of a YC separation process, an IP (interlace / progressive) conversion process, and an NR (noise reduction) process is performed in the video signal processing step.
The image display method of the present invention is characterized in that in the video signal processing step, one of frame correlation processing and line correlation processing is set as the video signal processing setting parameter.
The image display method of the present invention is characterized in that the video signal is subjected to gamma correction in the video signal processing step, and a gamma curve used for the gamma correction is set as the video signal processing setting parameter.
The image display method of the present invention is characterized in that a black signal is inserted between frames in the output video signal in accordance with the display mode of the image.
The image display method of the present invention includes a receiving step of receiving a digital television broadcast and extracting a television broadcast signal and EPG (Electric Program Guide) information. In the mode setting step, the EPG information The display mode is set from the following.

  Since the present invention is configured as described above, the optimal image for the user can be provided by optimally controlling the image displayed on the image display device and the environment in which the image display device is installed. Can do.

  Hereinafter, the best mode for carrying out the present invention will be described. Hereinafter, a television receiver will be described as an image display apparatus according to an embodiment of the present invention.

(First embodiment)
FIG. 1 is a diagram showing a configuration of a television receiver 10 according to the first embodiment of the present invention.

  Here, in the television receiver 10, a video signal output from a tuner (reception unit) 11 that receives a television broadcast (digital broadcast) and extracts a video signal from the broadcast signal is used. Further, video signals input from external devices (external input) are also used, and these video signals are input to a video signal processing unit (video signal processing means) 12. Here, interlace processing is used for both video signals. Although there are actually audio signals, the audio signal processing is not different from the conventional one, and the description thereof is omitted.

  The television receiver 10 is installed in a room. At this time, the display screen is directed toward the user, and the opposite surface of the display screen is installed toward the wall. This installation method is the same as the installation method of a general television receiver.

  In the video signal processing unit (video signal processing means) 12, any one of the above video signals is first selected by the input switching circuit 121. Thereafter, this video signal is input to the AD conversion circuit 122 and converted into a digital signal suitable for the subsequent processing. However, this processing is not performed when the input video signal is already a digital signal. Thereafter, this signal is input to the YC separation circuit 123 and subjected to YC separation processing to be separated into a Y signal (luminance signal) and a C signal (color difference signal). Next, these signals are input to the IP conversion circuit 124, and IP conversion (interlace / progressive conversion) is performed. Next, these signals are converted by the scaling circuit 125 to match the size of the display screen or the number of pixels. Further, the image quality correction circuit 126 performs gamma correction, contrast correction, etc., and outputs the result. The operation of the video signal processing unit 12 is the same as that conventionally known.

  The above operations in the video signal processing unit 12 are set by video signal processing setting parameters and controlled as appropriate.

  First, in YC separation processing and IP conversion processing, two types are selected, which are performed by frame correlation processing or line correlation processing. In the case of performing the frame correlation process, a frame memory 13 that temporarily stores data of the previous frame currently being processed is used. When line correlation processing is performed, data stored in the frame memory 13 is not used, and data correlation processing is performed for each line. Frame correlation processing (three-dimensional YC separation processing) is effective when a good color image is reproduced in a still image, but since average data between frames is output, Not suitable for processing. Conversely, the inter-line correlation processing is not suitable for still image processing, but is suitable for processing images with intense motion between frames. That is, the video signal processing unit 12 controls whether the frame correlation or the line correlation is used as the video signal processing setting parameter.

  The gamma correction parameter (gamma curve) in the image quality correction circuit 126 is not constant but variable. That is, the gamma curve used here is also controlled as a video signal processing setting parameter in the video signal processing unit 12.

  In the video signal processing unit 12, in addition to the components described in FIG. 1, components that perform other processes can be provided. For example, an NR (noise reduction) processing circuit that similarly uses frame correlation or line correlation may be provided. In this process, the noise in the image is reduced by performing a weighted average process between frames or lines as described above.

  Next, the average luminance detection circuit 14 calculates the average luminance of the screen from this video signal. Thereafter, an LCD (Liquid Crystal Display) control circuit 15 controls the liquid crystal panel 16 based on the video signal to generate a display image.

  A liquid crystal panel 16 and a backlight 17 are used as display means for displaying an image in the television receiver 10. The backlight 17 is formed over almost the entire surface of the liquid crystal panel 16 and supplies illumination light to the liquid crystal panel 16. That is, when the liquid crystal panel 16 is illuminated with illumination light from the backlight 17, this display image is displayed as a color image. The backlight 17 is composed of a plurality of cold cathode tubes emitting light of different color temperatures, and the luminance of each cold cathode tube is determined by an operating voltage. This voltage is controlled by the backlight control circuit 18 controlled by the LCD control circuit 15. Is set by The color temperature of the illumination light emitted from the entire backlight 17 is controlled by the backlight control circuit 18 independently controlling the operating voltage of each cold cathode tube and adjusting the output illumination light. That is, in the backlight 17, the luminance and the color temperature are independently controlled by the operating voltage (backlight setting parameter) of each cold cathode tube.

  In the television receiver 10, in addition to the backlight 17, an indirect illumination light 19 and an indirect illumination control circuit 20 are provided as indirect illumination means. The indirect illumination light 19 is composed of, for example, RGB three-color LEDs (light emitting diodes), and is provided around the liquid crystal panel 16, and also serves as indirect illumination of the room in which the television receiver 10 is installed. . That is, when the user looks at the display screen, the light (indirect light) emitted from the indirect illumination light 19 does not reach the user directly, but is reflected from the wall or the like, so that the atmosphere around the display image is changed. Form. FIG. 2 shows an external perspective view of the relationship between the liquid crystal panel 16 and the indirect illumination light 19 from the oblique front side (the side where the liquid crystal panel 16 is present) of the television receiver 10. Here, the arrow in the figure is the direction in which the user views the display screen 161 in the liquid crystal panel 16 in the television receiver 10. Further, the backlight 17 is installed inside the television receiver 10 on the back side of the liquid crystal panel 16 and is not shown in FIG. With this configuration, unlike the illumination light emitted from the backlight 17, the indirect illumination light irradiates the periphery of the television receiver 10 and performs indirect illumination on the entire room.

  The LCD control circuit 15 controls the indirect illumination light 19 via the indirect illumination control circuit 20. The brightness and color temperature of the indirect illumination light 19 are controlled by the indirect illumination control circuit 20 in the same manner as the backlight 17. Further, a plurality of RGB three-color LEDs are provided, and by switching these, for example, the irradiation angle can be switched to the user side, the rear side of the television receiver 10 or the like. That is, in the indirect illumination light 19, the color temperature, brightness, and irradiation angle are independently controlled by ON / OFF of each LED, operating voltage, etc. (indirect illumination setting parameter).

  In the above configuration, the operations of the backlight control circuit 18 and the indirect illumination control circuit 20 are set by the LCD control circuit 15.

  Furthermore, in the above configuration, four types of 60 Hz, 90 Hz, 120 Hz, and 180 Hz are selected as the frame rate of the displayed image. An operation according to the frame rate in the television receiver 10 will be described below.

  The lowest frame rate to be set is 60 Hz. In this case, the processing in the double speed driving circuit 21 in FIG. 1 is not performed. In other cases, the frame rate interpolation process is performed on the video signal with the frame rate of 60 Hz by the double speed drive circuit 21, and the video signals with the frame rates of 90 Hz, 120 Hz, and 180 Hz are output to the LCD control circuit 15. Displayed on the liquid crystal panel 16. Therefore, the minimum frame rate when the double speed driving circuit 21 is operated is 90 Hz. The higher the frame rate, the higher the response to movement in the image.

  At this time, the double speed drive circuit 21 also performs control to reduce the afterimage feeling in the displayed image (moving image). For example, in the LCD control circuit 15, when the frame rate is high, the voltage at the rising edge of the drive voltage of the liquid crystal panel 16 is set high (overdrive control). Further, the control frequency of the backlight 17 and the indirect illumination light 19 is also changed according to the frame rate. For this reason, the double-speed drive circuit 21 controls the operating frequencies of the backlight control circuit 18 and the indirect illumination control circuit 20 at the same or substantially the same frequency as the frame rate.

  In order to reduce the afterimage feeling, the black insertion circuit 22 is also used. The black insertion circuit 22 reduces the feeling of afterimage by inserting a black signal between frames of the video signal to be output. The presence or absence of this black signal insertion operation is also selected in the same manner as the frame rate.

  In the above operation, when the frame rate is high, an image corresponding to fast movement is displayed, but the power consumption is high. When the frame rate is low, it is difficult to display an image corresponding to fast movement, but the power consumption is low. Therefore, as will be described later, these operations are appropriately set.

  The control unit (control means) 23 is composed of a microcomputer, and controls the entire television receiver 10. First, the control unit 23 controls the operation mode of the image quality correction circuit 126 in the video signal processing unit 12 and the operation modes of the backlight control circuit 18 and the indirect illumination control circuit 20 in the LCD control circuit 15. This mode of operation is set by the image display mode. That is, the video signal processing setting parameter, the backlight setting parameter, and the indirect illumination setting parameter are stored in the memory 24 in FIG. 1, selected by the control unit 23, read, and set. At this time, the operations of the double speed drive circuit 21 and the black insertion circuit 22 are also determined by this display mode. That is, the frame rate (60 Hz, 90 Hz, 120 Hz, 180 Hz) and whether or not a black signal is inserted are also determined by the control unit 23 according to this display mode.

  Next, this operation will be described. In this operation, for example, the value of the parameter used in the above control is set depending on the type of content output from the television receiver 10, and an optimum image is displayed depending on the type of content. Here, description will be given for three types of content: (1) sports broadcast, (2) news, and (3) movie. The characteristics controlled accordingly are (a) frame correlation / line correlation in video signal processing, (b) gamma characteristics, (c) presence / absence of black signal insertion, (d) frame rate of liquid crystal display, ( e) Luminance and color temperature of backlight, (f) Luminance, color temperature, and irradiation angle of indirect illumination light, the outline of which is shown as a table in FIG.

  That is, here, there are modes corresponding to the above three types as display modes, and any one of these is selected (mode setting step). Thereby, the video signal processing setting parameter is set, and the video signal processing unit 12 operates in response to this (video signal processing step). At the same time, a backlight setting parameter is set, and the backlight control circuit 18 and the backlight 17 operate in accordance with this (backlight control process). At the same time, indirect illumination setting parameters are set, and the indirect illumination control circuit 20 and the indirect illumination light 19 operate (indirect illumination control process). An image based on the video signal output from the video signal processing unit 12 is displayed by the display means (display process).

  First, (1) sports relay mode will be described. The feature of this screen is that the screen moves rapidly. In particular, in ball games, it is necessary to clearly display the instantaneous movement of the ball. For this reason, the upper characteristic in FIG. 3 is selected.

  In this case, in the video signal processing (video signal processing step) in the video signal processing unit 12, it is preferable to perform processing capable of enhancing the motion. For this reason, it is preferable that the YC separation circuit 123 performs line correlation processing instead of the frame correlation processing. The same applies to the IP conversion circuit 124.

  In addition, since it is preferable to increase the contrast of the image, it is preferable to set parameters for the gamma correction in the image quality correction circuit 126 so that the contrast of the image is increased. Therefore, as shown in the upper part of FIG. 3, the gamma curve uses a characteristic that exhibits a large change rate, particularly in the middle portion. In the gamma curve shown here, the horizontal axis is the input level, and the vertical axis is the output level.

  Further, particularly in this case, since it is necessary to reduce the feeling of afterimage, a black signal is inserted by the black insertion circuit 22 between frames in the video signal. Similarly, the double-speed drive circuit 21 outputs a frame rate as high as 180 Hz, and causes the LCD control circuit 15, the backlight control circuit 18, and the indirect illumination control circuit 20 to operate at this frame rate.

  The above is the setting contents in the processing related to the video signal output from the liquid crystal panel 16. In the television receiver 10, the setting contents of the backlight 17 and the indirect illumination light 19 are simultaneously controlled. That is, the control of the backlight 17 (backlight control process) and the control of the indirect illumination light 19 (indirect illumination control process) are performed at the same time.

  First, in order to display the entire screen brightly and clearly, it is preferable that the luminance and color temperature of the backlight 17 are high. Therefore, the backlight control circuit 18 increases the brightness of the backlight 17 and sets the color temperature to 12000K, for example. Thereby, the brightness | luminance and contrast of the image displayed can be made high.

  In order to further clarify the displayed image, it is preferable to simultaneously set the luminance and color temperature of the indirect illumination light 19 to be high. Therefore, the indirect illumination control circuit 20 increases the luminance of the indirect illumination light 19 and sets the color temperature to, for example, 12000 K, similarly to the backlight 17. In addition, it is preferable to brighten the periphery of the television receiver 10 so as to be close to the venue where the sport is actually performed. Therefore, the irradiation angle of the indirect illumination light 19 is the user side, that is, the front side of the television receiver 10.

  In this operation, since the frame rate is high as described above, the power consumption in the LCD control circuit 15 and the like is high. Moreover, since the brightness | luminance of the backlight 17 and the light 19 for indirect illumination is also high, the power consumption in these becomes high. Therefore, although the power consumption of the television receiver 10 is increased, an optimum environment can be obtained particularly when a sports broadcast is viewed with the television receiver 10. That is, it can be viewed with the same feeling as the venue where the sport is actually performed.

  Next, (3) movie mode will be described. The feature of the screen in this case is that the screen moves little but the color is important. For this reason, the lower characteristic in FIG. 3 is selected.

  Therefore, in this case, it is preferable that the processing in the video signal processing unit 12 does not place importance on the motion and performs processing that can enhance the color. For this reason, in the YC separation circuit 123, it is preferable to perform frame correlation processing instead of line correlation processing. The same applies to the IP conversion circuit 124.

  Further, in the contrast of the image, it is preferable to increase the gradation expression in the dark part in order to enhance the color. Therefore, in the gamma correction in the image quality correction circuit 126, it is preferable to set the parameter so that the contrast of the image is high in the dark part. Therefore, as the gamma curve in this case, a characteristic having a large slope at the rising portion as shown in the lower part of FIG. 3 is used.

  In this case, since it is not particularly necessary to reduce the afterimage feeling, the black insertion circuit 22 is not operated. Similarly, the double speed drive circuit 21 outputs an output with a frame rate as low as 90 Hz, and the LCD control circuit 15, the backlight control circuit 18, and the indirect illumination control circuit 20 are also operated at this frame rate. Thereby, power consumption in these circuits can be reduced. In this case, the frame rate may be set to 60 Hz so that the processing in the double-speed drive circuit 21 is not performed.

  The illumination light is preferably brought closer to the atmosphere of a movie theater. Therefore, it is preferable to set the illumination light to be dark overall. For this reason, the luminance and color temperature of the backlight 17 are set low. For example, the color temperature is set to 6500K, for example. This makes it possible to darken the displayed image as a whole and to clarify the color of the dark part.

  The brightness and color temperature of the indirect illumination light 19 are the same as those of the backlight 17. That is, the luminance is set low and the color temperature is set low as about 6500K. Further, the irradiation angle is the direction opposite to the user, that is, the side that is generally the wall side as the irradiation direction.

  In this operation, although it cannot cope with intense movement in the image, an optimum environment can be obtained particularly when a movie is viewed on the television receiver 10. That is, it can be viewed in the same environment as a movie theater. Further, power consumption in the LCD control circuit 15 and the like is reduced. Moreover, since the brightness | luminance of the backlight 17 and the light 19 for indirect illumination is also low, the power consumption in these becomes low. Therefore, the power consumption in the television receiver 10 can be reduced.

  Next, (2) news program mode will be described. A feature of the screen in this case is that it is intermediate between the case of the sports broadcast and the case of the movie. In other words, it is not necessary to emphasize movement as in sports broadcasting, and higher image quality is not required than in movies.

  Accordingly, it is preferable that the processing in the video signal processing unit 12 and the setting of the backlight 17 and the indirect illumination light 19 are intermediate between (1) the sports relay mode and (3) the movie mode. For this reason, the middle characteristic in FIG. 3 is selected.

  That is, the luminance of the backlight 17 and the indirect illumination light 19 is set to an intermediate value between the sports broadcast mode and the movie mode, and the color temperature is set to a value of about 9000K, for example. The illumination angle of the indirect illumination light 19 is set so that the upper side of the screen of the television receiver 10 and the vicinity of the center portion are brightened because it is sufficient to irradiate the screen appropriately and it is not necessary to brighten the front surface.

  Similarly, the double-speed drive circuit 21 outputs an output with a frame rate of 120 Hz which is an intermediate value between the two modes, and the LCD control circuit 15, the backlight control circuit 18, and the indirect illumination control circuit 20 also have this frequency. Let the action take place.

  As processing (YC separation processing, IP conversion) in the video signal processing unit 12, either frame correlation or line correlation may be performed. However, since an image of a news program is closer to a still image than a moving image, it is preferable to perform frame correlation processing.

  Arbitrary settings can also be made for the operation of the black insertion circuit 22. However, from the viewpoint of low power consumption, it is preferable not to perform black insertion.

  With this configuration, an optimum environment can be obtained particularly when a news program is viewed on the television receiver 10.

  In the above operation, for example, when a sports broadcast is viewed in (3) movie mode, the motion is not emphasized. When a movie is viewed in (1) sports broadcast mode, the image quality such as color is not good and the display is extreme for the user, causing eye fatigue. Therefore, an image optimal for the user is provided by selecting the display mode.

  In addition, (1) In the sports broadcast mode, the motion is emphasized, but (3) In the movie mode, instead of not emphasizing the motion, the power consumption in the television receiver 10 is reduced. Can do. In addition, a still image or an image close thereto can be displayed with good image quality. (2) A news program mode for performing this intermediate operation is also set.

  Note that when the tuner (reception means) 11 receives a television broadcast radio wave and extracts a video signal (reception step), EPG (Electric Program Guide) information can be obtained. With this EPG information, it is possible to recognize the content contents (sports broadcast, movie, news program). That is, the control unit 23 can determine the content content from the EPG information and automatically set the display mode.

  In addition, when the input of the video signal is a game, the setting that attaches importance to the movement of the screen is preferable. That is, the control unit 23 can set the display mode according to the setting of the input switching circuit 121.

  Or it is good also as a structure which a user can set this display mode freely. That is, the AV mode is set in which the content content in FIG. 3 is “dynamic mode” when the content is a sports program, “cinema mode” when the content is a movie, and “standard mode” when the content is a news program. The setting can be freely selected. In this case, for example, in the case of a movie with intense movement such as an action movie, the user can set the same setting as that for the sports broadcast.

  Further, the above is an example in which three types of display modes are set according to the type of content, but it is also possible to set the display mode more finely and select it according to the external environment.

  For example, an illuminometer that detects the illuminance of a room in which the television receiver 10 is installed may be provided, and these settings may be performed according to the illuminance. In this case, when the illuminance of the room is low, the color temperature and luminance of the indirect illumination light 19 can be set high. Further, the illumination of the room may be optimized by further feeding back the illuminance of the adjusted room and adjusting the color temperature and brightness of the indirect illumination light 19. At this time, these can also be set according to the average luminance of the video signal detected by the average luminance detection circuit 14.

  Also, these settings may be made according to the time. In this case, since the environment is generally bright during the daytime, the color temperature and brightness of the indirect illumination light 19 may be set low, or may be turned off.

  Also, based on all of the content type, room environment, and time, the operation contents of the video signal processing unit 12, the backlight 17, and the indirect illumination light 19, or the setting of the frame rate and the presence / absence of black signal insertion are set. May be. Similarly, these operation contents can be set as appropriate.

  With the above configuration, an image optimal for the user can be provided by optimally controlling the image displayed on the image display device and the environment in which the image display device is installed.

  In the above example, the case where the television receiver 10 receives a digital broadcast has been described. However, the present invention is not limited to this. The same IP conversion, NR processing, and the like can be performed when receiving an analog broadcast. Therefore, the video signal processing unit can perform at least one of YC separation processing, IP conversion, NR processing, and gamma correction, and can perform the processing using the video signal processing setting parameters. The same applies to the setting of the frame rate and the presence or absence of black signal insertion. Similarly, the processing performed here can be set as appropriate.

  In the above example, the color temperature and the brightness are controlled in the backlight. However, at least one of them can be controlled. In this case, the effect is reduced, but the same quality effect is obtained. It is done. The same applies to the indirect illumination means. In the above example, the color temperature, the luminance, and the irradiation angle are controlled, but at least one of them may be controlled. The same applies to the setting of the frame rate, the setting of the control frequency of the backlight or indirect illumination light, and the presence or absence of black signal insertion, and control may be performed independently of these.

  Furthermore, although the backlight is used in the above example, even when the backlight is not used and only the indirect illumination light (indirect illumination means) is used, this is synchronized with the operation of the video signal processing unit. It is clear that the same effect can be obtained by controlling the control.

(Second Embodiment)
On the other hand, it is also possible to use light emitted from the backlight as indirect illumination light without providing an indirect illumination light. An external perspective view of a television receiver 30 using this configuration is shown in FIG. Here, the arrow in the figure is the direction in which the user views the television receiver 30. That is, FIG. 4 is a view of the television receiver 30 viewed from the opposite direction to FIG. The configuration of the television receiver 30 is the same as that in FIG. 1 except that the indirect illumination light 19 and the indirect illumination control circuit 20 in FIG. 1 are not used.

  In the television receiver 30, the backlight 31 is installed over the entire back side of the liquid crystal panel 32, and supplies illumination light over the entire surface of the liquid crystal panel 32. Although the side surface and the back surface of the backlight 31 are covered with a metal cover, a plurality of slits 33a formed along the horizontal direction are provided on the side surface, and individual opening / closing of the slits 33a is controlled by the control unit. Is done. Through this slit 33a, light emitted from the cold cathode fluorescent lamp in the backlight 31 leaks from the back side to the outside. This leaked light can be used as indirect illumination light. Thereby, the brightness | luminance and irradiation angle of this indirect illumination light are controllable.

  Similarly, a plurality of slits 33b formed along the vertical direction are also provided on the back surface of the television receiver 30, and the brightness and irradiation angle of the indirect illumination light can be controlled by controlling the opening and closing. it can. In this way, the luminance and irradiation angle of the indirect illumination light can be controlled by providing slits of an arbitrary form on the surface of the backlight 31 around the television receiver 30 and controlling the opening and closing thereof.

  In the display mode (FIG. 3) set in the first embodiment, the color temperature in the backlight and the color temperature in the indirect illumination light are set to be the same. In such a case, the same effect can be obtained by using the configuration shown in FIG. 4 without providing the indirect illumination light. That is, the same operations and effects as those of the first embodiment can be obtained using a simpler configuration.

  In any of the above examples, the television receiver has been described. However, it is obvious that the present invention is applied to any image display device having indirect illumination means.

It is a figure which shows the structure of the television receiver used as the 1st Embodiment of this invention. [BRIEF DESCRIPTION OF THE DRAWINGS] It is an external appearance perspective view of the television receiver used as the 1st Embodiment of this invention. It is a figure shown about the operation | movement content in three types of display modes used in the television receiver used as the 1st Embodiment of this invention. It is an external appearance perspective view of the television receiver used as the 2nd Embodiment of this invention.

Explanation of symbols

10, 30 Television receiver 11 Tuner (reception means)
12 Video signal processing unit (video signal processing means)
13 Frame memory 14 Average luminance detection circuit 15 LCD control circuit 16, 32 Liquid crystal panel 17, 31 Backlight 18 Backlight control circuit 19 Light for indirect illumination (indirect illumination means)
20 Indirect lighting control circuit (indirect lighting means)
21 Double-speed drive circuit 22 Black insertion circuit 23 Control unit (control means)
24 Memory 33a, 33b Slit 121 Input switching circuit 122 AD conversion circuit 123 YC separation circuit 124 IP conversion circuit 125 Scaling circuit 126 Image quality correction circuit 161 Display screen

Claims (30)

An image display device that displays an image based on the video signal by outputting an input video signal to a display unit via a video signal processing unit,
Indirect illumination means for emitting indirect illumination light for illuminating the periphery of the image display device;
Control means for determining video signal processing setting parameters in the video signal processing means and indirect illumination setting parameters in the indirect illumination means according to the display mode of the image;
An image display device comprising:   The image display apparatus according to claim 1, wherein the indirect illumination unit is controlled at the same frequency as a frame rate in the output video signal. A double speed drive circuit for changing the frame rate in the output video signal is used,
The image display apparatus according to claim 1, wherein the control unit determines the frame rate according to a display mode of the image. A backlight is used in the display means,
4. The image display device according to claim 1, wherein the control unit sets a backlight setting parameter for the backlight. 5.   The image display device according to claim 4, wherein at least one of color temperature and luminance in the backlight is controlled by the backlight setting parameter.   The image display device according to claim 4, wherein the backlight is controlled at the same frequency as a frame rate in the output video signal.   The image display apparatus according to claim 4, wherein the display unit displays the image by a liquid crystal panel.   The image display device according to claim 4, wherein the backlight is also used for the indirect illumination unit.   The image display device according to claim 8, wherein a slit is provided around the backlight, and light emitted from the slit is used as the indirect illumination light.   The image display according to any one of claims 1 to 9, wherein at least one of color temperature, luminance, and irradiation angle in the indirect illumination unit is controlled by the indirect illumination setting parameter. apparatus.   11. The video signal processing means includes at least one of YC separation processing, IP (interlace / progressive) conversion processing, and NR (noise reduction) processing. The image display device according to claim 1.   12. The image display device according to claim 11, wherein in the video signal processing means, one of frame correlation processing and line correlation processing is used as the video signal processing setting parameter.   13. The video signal processing unit performs gamma correction of the video signal, and a gamma curve used for the gamma correction is set as the video signal processing setting parameter. The image display device according to claim 1. A black insertion circuit for inserting a black signal between frames in the output video signal is used,
The image display device according to any one of claims 1 to 13, wherein the control unit determines whether or not the black signal is inserted depending on a display mode of the image. Receiving means for receiving a digital television broadcast and extracting a television broadcast signal and EPG (Electric Program Guide) information;
The image display apparatus according to claim 1, wherein the control unit sets the display mode based on the EPG information. An image display method for processing an input video signal to display an image based on the video signal and illuminating the periphery of the image with indirect illumination light emitted by an indirect illumination light,
A mode setting step for setting a display mode of the image;
A video signal processing step of processing the video signal using a video signal processing setting parameter determined by the display mode;
A display step of displaying an image based on the video signal after the processing of the video signal;
An indirect illumination control step of controlling the light for indirect illumination using an indirect illumination setting parameter determined by the display mode;
An image display method comprising:   The image display method according to claim 16, wherein the indirect illumination light is controlled at the same frequency as a frame rate in the output video signal.   The image display method according to claim 16 or 17, wherein a frame rate in the output video signal is set according to a display mode of the image. In the display step, a backlight is used,
The image according to any one of claims 16 to 18, further comprising a backlight control step for controlling the backlight using a backlight setting parameter determined by the display mode. Display method.   The image display method according to claim 19, wherein at least one of color temperature and luminance in the backlight is controlled by the backlight setting parameter.   21. The image display method according to claim 19, wherein the backlight is controlled at the same frequency as a frame rate in the output video signal.   The image display method according to any one of claims 19 to 21, wherein in the display step, the image is displayed by a liquid crystal panel.   The image display method according to any one of claims 19 to 22, wherein light emitted from the backlight is used as the indirect illumination light.   24. The image display method according to claim 23, wherein a slit is provided around the backlight, and light emitted from the slit is used as the indirect illumination light.   The image display method according to any one of claims 16 to 24, wherein at least one of color temperature, luminance, and irradiation angle of the indirect illumination light is controlled by the indirect illumination setting parameter. .   26. Any one of claims 16 to 25, wherein at least one of a YC separation process, an IP (interlace / progressive) conversion process, and an NR (noise reduction) process is performed in the video signal processing step. The image display method according to item.   27. The image display method according to claim 26, wherein in the video signal processing step, use of any one of frame correlation processing and line correlation processing is set as the video signal processing setting parameter. Gamma correction of the video signal in the video signal processing step,
The image display method according to any one of claims 16 to 27, wherein a gamma curve used for the gamma correction is set as the video signal processing setting parameter.   The image display method according to any one of claims 16 to 28, wherein a black signal is inserted between frames in the output video signal according to the display mode of the image. Receiving a digital television broadcast and extracting a television broadcast signal and EPG (Electric Program Guide) information;
30. The image display method according to claim 16, wherein in the mode setting step, the display mode is set from the EPG information.