JP2011109605A - Image display apparatus, image display observation system and image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To notify only a user, who does not wear shutter glasses, of a prescribed message when displaying a three-dimensional video. <P>SOLUTION: An image display apparatus includes: a message adder 120b for receiving input of signals of right-eye and left-eye images and adding prescribed message information to the right-eye image and the left-eye image; a video signal controller 120a which outputs a signal for alternately displaying the right-eye image and the left-eye image to which the message information has been added; and a display panel 134 to which the signal output from the video signal controller 120a is output, which alternately displays the right-eye image and the left-eye image thereon and displays the message information in the timing to switch the right-eye image and the left-eye image. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image display device, an image display observation system, and an image display method.

  Conventionally, as described in, for example, the following patent document, a liquid crystal shutter that supplies a left-eye image and a right-eye image having parallax alternately to a display at a predetermined cycle and is driven in synchronization with the predetermined cycle. There is known a method of visually recognizing a stereoscopic image by observing with a pair of glasses.

JP-A-9-138384 JP 2000-36969 A JP 2003-45343 A

  However, with the above-described method, a user who is not wearing glasses equipped with a liquid crystal shutter cannot visually recognize a stereoscopic image. In this case, since the left-eye image and the right-eye image have parallax, a user who is not wearing glasses visually recognizes the left-eye image and the right-eye image having parallax with both eyes, and thus is visually recognized as a normal two-dimensional image. I can't do that either. Therefore, it is necessary to notify a user who is not wearing glasses that a 3D video is being displayed.

  On the other hand, when information notifying that a 3D video is being displayed is added to the video, for a user who normally wears glasses equipped with a liquid crystal shutter and watches the 3D video normally Unnecessary information is notified.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to notify a predetermined message only to a user who is not wearing shutter glasses. It is an object to provide a new and improved image display device, image display observation system, and image display method.

  In order to solve the above-described problems, according to an aspect of the present invention, message information addition that receives input of signals for a right-eye image and a left-eye image and adds predetermined message information to the right-eye image and the left-eye image A signal control unit that outputs a signal for alternately displaying the right-eye image and the left-eye image to which the message information is added, and a signal output from the signal control unit is input, There is provided an image display device comprising: a display panel that alternately displays an image and a left-eye image and displays the message information at a timing when the right-eye image and the left-eye image are switched.

  In addition, for viewing glasses having right-eye and left-eye shutters, a timing signal indicating open periods of the right-eye and left-eye shutters is generated, and the right-eye and left-eye are displayed at the timing when the message information is displayed. An eyeglass control signal transmission unit that transmits the timing signal for closing both the left-eye shutters may be provided.

  The signal control unit may output a signal for continuously displaying the right-eye image and the left-eye image at least twice.

  The display panel includes a backlight, and includes a backlight control unit that turns on the backlight in accordance with a timing when the right-eye image and the left-eye image are displayed and a timing when the message information is displayed. There may be.

  Further, the display panel is a liquid crystal display panel that performs line-sequential display in the vertical direction of the display screen, and the display panel is based on the signals of the right-eye image and the left-eye image to which the message information is added. The message information may be displayed on the upper or lower end in the vertical direction of the display screen.

  The display panel may display the message information at the lower end in the vertical direction of the display screen immediately before the timing of switching between the signals for the right eye image and the left eye image.

  The display panel may display the message information on the upper end in the vertical direction of the display screen immediately after the timing of switching between the right-eye image signal and the left-eye image signal.

  The message adding unit may add the message information by determining luminance of an area to which the message information is added based on luminance of frames before and after the right-eye image and the left-eye image. Good.

  In order to solve the above-described problem, according to another aspect of the present invention, a signal for a right-eye image and a left-eye image is input, and predetermined message information is added to the signal for the right-eye image and the left-eye image. A message information adding unit to be added, a signal control unit for outputting a signal for alternately displaying the right-eye image and the left-eye image to which the message information is added, and a signal output from the signal control unit are input. A display panel that alternately displays a right-eye image and a left-eye image, and displays the message information at a timing when the right-eye image and the left-eye image are switched; and a shutter for right and left eyes. For eyeglasses, a timing signal indicating an open period of the shutter for the right eye and the left eye is generated, and for the right eye at a timing when the message information is displayed. And an eyeglass control signal transmission unit that transmits the timing signal for closing both the shutter for the left eye and the shutter for the left eye, and the shutter for the right eye and the left eye are alternately switched based on the timing signal. There is provided an image display observation system including the ornamental glasses that close and close both the right-eye shutter and the left-eye shutter at a timing when the message information is displayed.

  In order to solve the above-described problem, according to another aspect of the present invention, a signal for a right-eye image and a left-eye image is input, and predetermined message information is added to the signal for the right-eye image and the left-eye image. A step of adding, a step of outputting a signal for alternately displaying the image for the right eye and the image for the left eye to which the message information is added, a signal output from the signal control unit, and an image for the right eye And displaying the message information at a timing at which the right-eye image and the left-eye image are switched, and an image display method.

  According to the present invention, it is possible to notify a predetermined message only to a user who is not wearing shutter glasses.

It is a schematic diagram which shows the structure of the stereo image display observation system which concerns on one Embodiment of this invention. It is a block diagram which shows the structure of an image display apparatus. It is a schematic diagram which shows the principle of twice writing by this embodiment, and opening and closing of liquid-crystal shutter 200a, 200b. It is a schematic diagram which shows the concept of a message display method. It is a schematic diagram which shows message display and opening and closing of a liquid-crystal shutter in detail. It is a schematic diagram which shows the example which displays a message on the upper part of a display screen. It is a schematic diagram which shows the example which displays line-sequentially from the lower side of the display screen of an image display apparatus. In the example of FIG. 5, it is a schematic diagram which shows the example which synchronized the lighting timing of the backlight. In the example of FIG. 6, it is a schematic diagram which shows the example which synchronized the lighting timing of the backlight. It is a schematic diagram which shows the example at the time of applying to a plasma display panel.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

The description will be made in the following order.
(1) System configuration example (2) Image display device configuration example (3) Double-write example according to this embodiment (4) Message display example according to this embodiment (5) Example of synchronized lighting of backlight (6) Application to plasma display panel (7) Specific configuration example to improve message visibility

[(1) System configuration example]
FIG. 1 is a schematic diagram showing a configuration of a stereoscopic image display observation system according to an embodiment of the present invention. As shown in FIG. 1, the system according to the present embodiment includes an image display device 100 including an LCD and display image viewing glasses 200.

  The image display device 100 is, for example, a time-division stereoscopic video display device, and alternately displays a left-eye video and a right-eye video on the entire screen in a very short cycle. In addition, the image display apparatus 100 provides the left eye and the right eye separately in synchronization with the display cycle of the left eye video and the right eye video. For example, the image display device 100 alternately displays the right-eye image R and the left-eye image L for each field. The display image viewing glasses 200 are provided with a pair of liquid crystal shutters 200a and 200b in a portion corresponding to a lens. The liquid crystal shutters 200a and 200b alternately open and close in synchronization with image switching for each field of the image display device 100. That is, in the field where the right-eye image R is displayed on the image display device 100, the left-eye liquid crystal shutter 200b is in a closed state, and the right-eye liquid crystal shutter is in an open state 200a. In the field where the left-eye image L is displayed, the reverse operation is performed. As described above, the image display device 100 alternately displays the left-eye video L and the right-eye video R on the entire screen at a very short cycle, and at the same time, the display cycle of the left-eye video L and the right-eye video R. The video is provided separately for the left eye and the right eye in synchronization with

  By such an operation, only the right-eye image R is incident on the right eye of the user who views the image display device 100 wearing the viewing glasses 200, and only the left-eye image L is incident on the left eye. For this reason, the images for the right eye and the left eye are synthesized inside the viewer's eyes, and the image displayed on the image display device 100 is recognized three-dimensionally. The image display apparatus 100 can also display a normal two-dimensional image. In this case, switching between the right-eye image R and the left-eye image L is not performed.

[(2) Configuration Example of Image Display Device]
Next, the configuration of the image display apparatus 100 will be described. FIG. 2 is a block diagram illustrating a configuration of the image display apparatus 100. As shown in FIG. 2, the image display device 100 includes a graphic generation unit 120, a glasses control signal transmission unit 122, an emitter 124, a panel drive unit 126, a CPU 128, a gate driver 130, a data driver 132, and a liquid crystal display panel 134. A backlight (surface light source) 136 is disposed behind the liquid crystal display panel 134.

  The liquid crystal display panel 134 includes a liquid crystal layer, a transparent electrode facing the liquid crystal layer, a color filter, and the like.

  Left and right video signals for displaying the right-eye image R and the left-eye image L are input to the graphic generation unit 120 as an HDMI signal, for example. The graphic generation unit 120 includes a video signal control unit 120a and a message addition unit 120b. The video signal control unit 120a alternately outputs left and right video signals in order to display the right-eye image R and the left-eye image L alternately on the liquid crystal display panel 134. In addition, since the video signal control unit 120a performs writing twice, which will be described later, based on the input left and right video signals, the same two signals are consecutive for each of the right-eye video signal and the left-eye video signal. Perform conversion.

  The message adding unit 120b adds a message that is visible only to the user who is not wearing the viewing glasses 200 to the right-eye image R and the left-eye image L. The message adding unit 120b adds the message by determining the luminance of the message display area based on the luminance of the previous and subsequent frames, for example.

  The panel driving unit 126 converts the right-eye video signal (R1a, R1b, R2a, R2b,...) And the left-eye video signal (L1a), which are converted by the video signal control unit 120 and the message is added by the message addition unit 120b. , L1b, L2a, L2b,. The panel drive unit 126 converts the input right-eye video signal and left-eye video signal into signals to be input to the liquid crystal display panel 134, and generates pulse signals used for the operations of the gate driver 130 and the data driver 132. . In addition, the panel driving unit 126 transmits a signal indicating switching between the left and right video signals to the CPU 128. Further, the panel drive unit 126 turns on the backlight 136 according to the switching timing of the left and right video signals and the message display timing.

  The signal converted by the panel driving unit 126 is input to each of the gate driver 130 and the data driver 132. The gate driver 130 and the data driver 132 receive the pulse signal generated by the panel driving unit 126 and cause each pixel of the liquid crystal display panel 134 to emit light based on the input signal. As a result, an image is displayed on the liquid crystal display panel 134.

  The CPU 128 sends a timing signal indicating the opening / closing timing of the viewing glasses 200 to the glasses control signal transmission unit 122 based on the signal sent from the panel driving unit 126 and indicating the switching of the left and right video signals. As will be described later, the CPU 128 determines the opening / closing timing in consideration of the response speed of the liquid crystal, and generates a timing signal. In addition, when the backlight 136 is lit in synchronization with video switching, the CPU 128 determines the opening / closing timing in consideration of the lighting period of the backlight 136 and generates a timing signal. The glasses control signal transmission unit 122 sends a drive signal for causing the emitter 124 to emit light to the emitter 124 based on the timing signal sent from the CPU 128. The emitter 124 transmits an optical signal indicating the switching timing of the left and right video signals (opening / closing timing of the liquid crystal shutters 200a and 200b) to the viewing glasses 200 by infrared communication or the like.

  Although not shown in detail, the display image viewing glasses 200 include a sensor that receives an optical signal. The viewing glasses 200 that have received the optical signal alternately perform opening / closing operations of the liquid crystal shutters 200a and 200b in synchronization with the switching timing of the right-eye video signal and the left-eye video signal of the image display device 100.

  Note that the image processing method according to the present embodiment is realized by processing sequentially performed by the graphic generation unit 120, the panel drive unit 126, and the liquid crystal display panel 134.

[(3) Example of writing twice according to this embodiment]
In order to eliminate occurrence of crosstalk due to insufficient response speed of the liquid crystal and insufficient luminance, in this embodiment, the drive frequency of the liquid crystal panel is increased and one frame of the left and right images is applied to the liquid crystal display panel 134 twice. A technique of displaying (writing) is adopted.

  FIG. 3 is a schematic diagram showing the principle of double writing according to the present embodiment and the opening and closing of the liquid crystal shutters 200a and 200b. By writing 60 [Hz] of the NTSC signal twice, the right-eye image R and A case where each of the left eye images L is displayed at a drive frequency of 240 [Hz] is shown. In FIG. 3, the time for which the right-eye image R or the left-eye image L is displayed by one writing is 1/240 [Hz] = 4.2 [ms].

  When displaying on the liquid crystal display panel 134 as in the present embodiment, when displaying one frame, in general, the display is updated line by line in order from the top line of the panel to the bottom, and the lines are sequentially displayed. An image is displayed. For this reason, when the image to be displayed changes from left-eye image L to right-eye image R to left-eye image L, a new frame image is displayed at the top of the screen while the changed frame is being displayed. Although displayed, the lower part of the screen is in a state where the video of the previous frame remains. When the liquid crystal shutters 200a and 200b of the display image viewing glasses 200 are opened in such a state, a video in which the previous frame and the new frame are mixed enters the eyes, so that the video cannot be displayed correctly, and the left-eye image is displayed. Crosstalk in which L and the right-eye image R are mixed occurs.

  In order to prevent such crosstalk, in the present embodiment, the same frame is displayed twice, and the image of the same frame is displayed on the entire surface of the liquid crystal display panel 134 by opening the shutter of the glasses only during the second display. Only the state that has been made is visible to the user. At this time, the liquid crystal display panel 134 performs display in the order of L 1 → L 1 → R 1 → R 1 → L 2 → L 2 → R 2 → R 2 →... At a frame rate four times that of the input video. The shutter of the viewing glasses 200 is opened only for the second frame of the image L for L and the right eye.

  Hereinafter, it demonstrates in detail based on FIG. Here, for example, it is assumed that two images of a left-eye image L and a right-eye image R are sent for each frame by HDMI. In this case, as shown in FIG. 3A, the left and right video signals are sequentially sent in the order of L 1 → R 1 → L 2 → R 2 → L 3 → R 3... And input to the video signal control unit 120. The

  As shown in FIG. 3B, the video signal control unit 120, based on the input left and right video signals, the left-eye video signals L1, L2, L3,... And the right-eye video signals R1, R2, R3. ,... Are converted so that two identical signals are continuous. As a result, the left-eye video signal L1 is converted into L1a and L1b, and the right-eye video signal R1 is converted into R1a and R1b. The conversion is performed in the same manner for other signals. As a result, the video signal control unit 120 sequentially outputs the left and right video signals in the order of L1a → L1b → R1a → R1b → L2a → L2b → R2a → R2b... As shown in FIG.

  The liquid crystal display panel 134 performs display based on the left and right video signals output from the video signal control unit 120. FIG. 3C is a schematic diagram showing an image displayed on the liquid crystal display panel 134. In FIG. 3C, the region # 1 is a region where the left eye image L is displayed, the region # 2 is a region waiting for the liquid crystal response of the left eye image L, and the region # 3 is a right eye image R. The displayed area and area # 4 indicate the areas of the right-eye image R in the liquid crystal response waiting state. More specifically, in regions # 2 and # 4, although the charge of each pixel of the liquid crystal display panel 134 has been rewritten to that of a new image in the next frame, it has the correct luminance due to waiting for the response of the liquid crystal. It is an area with no state.

  FIG. 3B schematically shows how the signal changes with time. For example, FIG. 3B shows a state where the first signal L1a of the left-eye image L is output line-sequentially between the times t0 and t1. Similarly, FIG. 3C schematically shows how the display on the liquid crystal display panel 134 changes with time. Each video display shown in FIG. 3C corresponds to a video at each time t2, t3, t4, t5, and t6 in FIG. 3B.

  As shown in FIG. 3B, before the time t2, the first and second left-eye image signals L1a and L1b are output, and at time t2, the signal is switched from L1b to R1a. For this reason, as shown in FIG. 3C, at the time t2, the left-eye image L1 is displayed in the upper region # 1 of the liquid crystal display panel 134, but in the lower region # 2, the time The left-eye image L1 based on the signal L1b input immediately before t2 is in a response state of the liquid crystal.

  Next, at time t3, the first right-eye image signal R1a is output, and the right-eye image R1 based on the signal R1a is written on the liquid crystal display panel 134. At this time, since the video is sequentially written from the upper side of the liquid crystal display panel 134, the image displayed at the time t3 is displayed as the right-eye image R1 by the signal R1a in the area # 3 on the upper side of the panel. In the lower area # 1, the left-eye image L1 of the previous frame is displayed. In the middle region # 4 above and below the panel, the right-eye image R1 based on the signal R1a is in a response state.

  Next, at time t4, the signal is switched from R1a to R1b, and writing of the right-eye image R1 to the liquid crystal display panel 134 by the signal R1b is started. Prior to time t4, the first right-eye image signal R1a is output. At time t4, writing of the right-eye image R1 to the liquid crystal display panel 134 using the signal R1b is started. Therefore, at the initial stage (t4) of writing the right-eye image R by the signal R1b, the first right-eye image R by the signal R1a is displayed in the almost entire area # 3 on the upper side of the panel, and the lower area of the panel # 4 is during the liquid crystal response of the right-eye image R1 by the signal R1a.

  Next, at the time t5, the response time of the liquid crystal has elapsed from the time t4 when the writing of the right-eye image R to the liquid crystal display panel 134 by the signal R1b is started. The image R1 is displayed. For this reason, at the time t5, the right-eye image R1 is displayed on the entire surface of the liquid crystal display panel 134.

  Next, at time t6, the signal is switched from R1b to L2a, and writing of the left-eye image L2 to the liquid crystal display panel 134 by the signal L2a is started. As a result, the upper part of the right-eye image R1 displayed on the entire panel surface before time t6 gradually starts to change to the left-eye image L2.

  Here, focusing on the display of the right-eye image R1, at time t3, the right-eye image R1 based on the signal R1a is displayed on the upper side of the panel, and the left-eye image L1 of the previous frame is displayed on the lower side of the panel. It becomes. For this reason, if the right-eye liquid crystal shutter 200a is opened at time t3, the left and right images are mixed and visually recognized by the user's right eye. At time t4, the first right-eye image R based on the signal R1a is displayed on almost the entire upper surface of the panel, and the image based on the signal R1a is in response to the liquid crystal at the bottom of the panel. R1 does not reach the desired luminance. For this reason, when the right-eye liquid crystal shutter 200a is opened at time t4, an image that does not reach the desired luminance at the lower part of the panel is visually recognized by the user's right eye.

  On the other hand, since the right-eye image R1 is displayed on the entire surface of the liquid crystal display panel 134 at time t5, when the right-eye liquid crystal shutter 200a is opened at time t5, the image is displayed on the entire panel with a desired luminance. The right-eye image R can be visually recognized by the user's right eye.

  Here, in the region # 4 displayed at the bottom of the panel at time t4 where the liquid crystal does not respond completely, assuming that the response speed of the liquid crystal is T [ms], T [ms] has elapsed since time t4. Then, the liquid crystal responds and reaches a desired luminance. As described above, when the response speed of the liquid crystal is taken into consideration, even if the charge of each pixel of the liquid crystal is rewritten in each line, the display is performed with the correct luminance with a delay of the response speed time of the liquid crystal. Accordingly, the liquid crystal shutter 200a is opened after T [ms] has elapsed since time t4. Note that the response speed T of the liquid crystal is a value of about 4 [ms], for example. Further, after the time t6, the upper part of the right-eye image R1 starts to gradually change to the left-eye image L2 by writing the left-eye image L2 using the signal L2a. To close. Thereby, it can suppress that the image L2 for left eyes which begins to be displayed on the upper part of a panel is mixed with image R1 for right eyes, and is visually recognized by a user's right eye.

  As described above, in the present embodiment, the signals of {L1a, L1b}, {R1a, R1b}, {L2a, L2b}, {R2a, R2b},. When the second display of L and R (L1b, R1b, L2b, R2b,...) Is displayed, the shutter of the glasses is opened. As a result, it is possible to suppress crosstalk where left and right images are mixed, and to secure desired luminance.

  The above-mentioned display by double writing is other 3D such as normal television (TV) broadcasting, Internet television that acquires video via a network, or side-by-side (Side-by-Side). Also in the transmission method, processing is performed after the L and R videos are extracted in the image processing apparatus 100 on the receiver side. Furthermore, similar processing can be performed in a DLP projector or the like. Therefore, in these methods, the display timing of the panel can be similarly performed.

[(4) Example of message display according to this embodiment]
Next, an example of message display according to the present embodiment will be described. A predetermined message may be displayed on the image display device 100 together with the video. Such a message is normally displayed in the display screen as text information.

  As described above, the left-eye image L and the right-eye image R are alternately displayed on the image display device 100, and the display image viewing glasses 200 open and close the liquid crystal shutters 200a and 200b in synchronization therewith. Therefore, a user who is not wearing the display image viewing glasses 200 cannot visually recognize the video as a three-dimensional image. Further, since there is a parallax between the left-eye image L and the right-eye image, a user who does not wear the display image viewing glasses 200 cannot view the image as a normal 2D image. For this reason, in the present embodiment, a user who is not wearing the display image viewing glasses 200 indicates that the currently displayed video is a stereoscopic video and wears the display image viewing glasses 200. Display a message prompting you to do so.

  On the other hand, since the user wearing the display image viewing glasses 200 can normally visually recognize the stereoscopic image, it is not necessary to visually recognize such a caution message. Thus, in the present embodiment, only the user who does not wear the display image viewing glasses 200 can view the message, and the user who does not wear the display image viewing glasses 200 displays the message so that the message cannot be viewed. . Hereinafter, such a display method will be described in detail.

  FIG. 4 is a schematic diagram showing the concept of the message display method according to the present embodiment. FIG. 4 schematically shows how the display on the liquid crystal display panel 134 changes with time, as in FIG. As described above, in the display by writing twice, the liquid crystal shutters 200a and 200b are opened in the second display of L and R (display by signals L1b, R1b, L2b, R2b,...). At this time, there is a timing in which both the left and right liquid crystal shutters 200a and 200b are closed in time series. Therefore, in the present embodiment, a message for the user is displayed during a period in which both the left and right liquid crystal shutters 200a and 200b are closed. The example of FIG. 4 shows an example in which a message “Please wear glasses during 3D playback” is displayed as a message.

  According to such a configuration, a message can be transmitted only to a user who is not wearing display image viewing glasses 200. In particular, when a 3D image is being displayed, a user who is not wearing glasses cannot view the image normally, which is effective when displaying a message prompting the user to wear glasses. For example, when a 3D image is displayed by the image display apparatus 100 installed in a street, a store, an exhibition hall, etc., an unspecified number of people will see the screen, but in such a case, glasses are not worn. The user can be notified that 3D video is being displayed, and can be prompted to wear glasses.

  In addition, since an image display device 100 such as a television receiver (TV) can be viewed by an arbitrary plurality of people, a message is continuously displayed while a 3D image is being displayed. People who come there can also see the message.

  Therefore, there is no restriction such as displaying a message only at the start of the program, and the message can be continuously displayed while the 3D video is being displayed.

  FIG. 5 is a schematic diagram showing in detail the message display and the opening / closing of the liquid crystal shutters 200a and 200b according to the present embodiment, and the manner in which the display on the liquid crystal display panel 134 changes with time as in FIG. 3C. This is shown schematically. In FIG. 5, the video display by the double writing is performed in the same manner as in FIG. As shown in FIG. 5, when the left-eye video L1 is written by the signal L1a between time t10 and t11, and the liquid crystal responds to the bottom of the panel at time t21, the left-eye image L1 is displayed on the entire panel surface. Thereafter, the left-eye video L1 is displayed until time t12. At time t12, the signal L1b is switched to R1a, and writing of the right-eye image R1 to the liquid crystal display panel 134 by the signal R1a is started. Thereafter, the upper part of the left-eye image L1 displayed before time t12 begins to gradually change to the right-eye image R1, and when the response of the liquid crystal is completed to the lower part of the panel at time t23, the right-eye image R1 is displayed on the entire surface of the panel. The state is displayed, and this state continues until time t14.

  FIG. 5 schematically shows the opening and closing timing of the liquid crystal shutters 200a and 200b. As shown in FIG. 5, during the first display of L and R (display by signals L1a, R1a, L2a, R2a,...), Both liquid crystal shutters 200a and 200b are closed.

  The liquid crystal shutter 200b is closed before time t21, but starts to open from time t31 in accordance with the timing at which the left-eye image L1 is displayed on the entire panel at time t21. Since the liquid crystal shutters 200a and 200b also require a certain amount of time for response due to the characteristics of the liquid crystal, the liquid crystal shutter 200b is completely opened at time t32 after time t31. As a result, the liquid crystal shutter 200b is opened in a state where the left-eye image L1 is displayed on the entire panel surface, so that the left-eye image L1 is visually recognized by the user's left eye.

  In this embodiment, since the message is displayed before the time t12 when the switching from the left-eye image L1 to the right-eye image R1 starts, the liquid crystal shutter 200b is closed before the time t12. For this reason, the liquid crystal shutter 200b starts to close at time t33. Even when the liquid crystal shutter 200b is closed, since a certain amount of time is required for the response, the liquid crystal shutter 200b is completely closed at time t34 after starting to close the liquid crystal shutter 200b at time t33.

  Then, the message “Please wear glasses during 3D playback” is displayed in the message area display period from time t22 to t12 in accordance with the timing at which the liquid crystal shutter 200b is closed at time t34. The message displayed in the section from time t22 to time t12 is not visually recognized by the user wearing the display image viewing glasses 200 because the liquid crystal shutter 200b is substantially closed in this section. Further, the liquid crystal shutter 200a is closed in the section where the message is displayed. Therefore, neither the right eye nor the left eye of the user wearing the display image viewing glasses 200 can see the message. On the other hand, a user who is not wearing display image viewing glasses 200 can visually recognize this message. Accordingly, as shown in FIG. 5, a message “Please wear glasses during 3D video playback” is displayed to display a 3D video to a user who is not wearing display image viewing glasses 200. This can be recognized, and the user can be prompted to wear the display image viewing glasses 200. On the other hand, the user wearing the display image viewing glasses 200 can continuously view the stereoscopic video without visually recognizing the message.

  In FIG. 5, taking into account the response of the shutter liquid crystal, the timing (t34) at which the liquid crystal shutter 200b is completely closed is after the start time t22 of the message area display period (t22 to t12). The timing (t34) at which 200b is completely closed may be set before the message display start time t22. Similarly, the timing (t31) at which the liquid crystal shutter 200b starts to be opened may be after the time t21.

  Similarly, when the right-eye image R1 is displayed, the liquid crystal shutter 200a transitions from closed to open between time t35 and t36 in accordance with the timing at which the right-eye image R1 is displayed on the entire panel at time t23. Thereafter, at time t37 prior to time t14 when switching from the right-eye image R1 to the left-eye image L1 starts, the liquid crystal shutter 200a starts to close, and at time t38, the liquid crystal shutter 200a is completely closed. A message is displayed in the message display period t24 to t14 in accordance with the timing of closing the liquid crystal shutter 200a. Thereby, the user wearing the display image viewing glasses 200 cannot view the message, and only the user who does not wear the display image viewing glasses 200 can view the message.

  FIG. 6 is a schematic diagram illustrating an example in which a message is displayed at the top of the display screen. In the example shown in FIG. 6, a message is displayed on the upper part of the display screen from time t10 to time t41 when the signal is switched from R2a to L1a. In addition, a message is displayed at the top of the display screen between time t12 and time t44 when the signal is switched from L2b to R1a.

  After that, when the second frame of the left-eye image L1 is displayed, the liquid crystal shutter 200b is opened with a delay corresponding to the number of lines for displaying the message area. Specifically, in the example of FIG. 5, the liquid crystal shutter 200b starts to be opened from the time t31. However, in FIG. 6, the time at which the liquid crystal shutter 200b is opened is the time corresponding to the number of lines displaying the message area. Delay and start opening from time t51. Thereafter, the liquid crystal shutter 200b is fully opened at time t52, and the left-eye image L1 displayed on the entire panel is displayed on the left eye of the user. Then, at time t53, the liquid crystal shutter 200b starts to close, and at time t54, the liquid crystal shutter 200b is completely closed.

  A message is displayed in the message area display period from time t12 to time t44 in synchronization with the timing at which the liquid crystal shutter 200b is closed at time t54. At this time, the time t54 when the liquid crystal shutter 200b is closed is set before the time t44 when the message display ends. Accordingly, since the liquid crystal shutter 200b is substantially closed during the message display period, the message can be prevented from being visually recognized by the user wearing the display image viewing glasses 200. Note that the time t54 when the liquid crystal shutter 200b closes may be set before the time t12 when the message display starts.

  Similarly, for the right-eye liquid crystal shutter 200a, the liquid crystal shutter 200a is closed before the message display ends in the message display period from time t10 to time t41. Thereby, a message can be prevented from being visually recognized by the user's right eye.

Since the liquid crystal display panel 134 updates the display line by line from the top line of the screen, the time T (message display period) corresponding to the number of lines in the message display area can be obtained from the following equation. .
T = [number of vertical lines in the message display area] / [number of vertical lines in the panel] * (1 second / [frame rate (number of frames displayed per second)])

  Note that, as described above, the frame rate in this embodiment is 240 [Hz], which is four times the frame rate of the video signal. In the example of FIG. 6, when the opening time of the liquid crystal shutters 200a and 200b is delayed by the time T with respect to the example of FIG. 5, the message display area is rewritten to the image by the second writing (time t43, time t46). Accordingly, the liquid crystal shutters 200a and 200b are opened. Therefore, the user wearing the display image viewing glasses 200 cannot view the message.

  As described above, according to the configuration of FIG. 5 and FIG. 6, when the liquid crystal display panel 134 is used, the user wearing the display image viewing glasses 200 receives the left-eye image L and the right-eye image R. Since only the video that has been rewritten to the video of the second frame is in the eyes, the message is not recognized by the user.

  On the other hand, a user who does not wear the display image viewing glasses 200 receives a message once every two frames for the left-eye image L and the right-eye image R displayed at a frame rate four times that of the video signal. Since the message is displayed, the message can be visually recognized. In this case, since the video is displayed at a high frame rate, it is possible to improve the visibility as a video even if the message is displayed once every two frames.

  FIG. 7 is a schematic diagram illustrating an example in which display is performed line-sequentially from the lower side of the display screen of the image display apparatus 100. In the example shown in FIG. 7, the left-eye video L1 based on the signal L1a is written from the lower side of the display screen at time t100, and the left-eye video L1 based on the signal L2b is written from the lower side of the display screen at time t110. At time t120, the signal L2b switches to the signal R1a, and the right-eye video R1 based on the signal R1a is written from the lower side of the display screen. At time t130, the right-eye video R1 based on the signal R2b is written from the lower side of the display screen. .

  Also in this case, when the response is completed up to the liquid crystal at the top of the panel at time t210, the left-eye image L1 is displayed on the entire panel surface. Thereafter, the left-eye video L2 is displayed until time t120. At time t120, writing of the right-eye image R to the liquid crystal display panel 134 by the signal R1a is started from the lower part of the screen. Thereafter, the lower part of the left-eye image L1 displayed before time t120 begins to gradually change to the right-eye image R1, and when the response of the liquid crystal is completed up to the upper part of the panel at time t240, the right-eye image R1 is displayed on the entire surface of the panel. The state is displayed, and this state continues until time t140.

  In the example of FIG. 7, the opening / closing timing of the liquid crystal shutters 200a and 200b is performed in the same manner as in FIG. That is, the liquid crystal shutter 200b is opened at the timing when the left-eye image L is displayed on the entire display screen, and the liquid crystal shutter 200b is opened at the timing when the right-eye image R is displayed on the entire display screen. Then, the liquid crystal shutters 200a and 200b are closed according to the timing when the message is displayed. The message is displayed in the message display period (time t230 to t120, time t250 to t140) until switching to the signal of the next frame.

(5) Example of Synchronizing Backlight Lighting FIG. 8 shows an example of synchronizing the lighting timing of the backlight 136 in the example of FIG. As shown in FIG. 8, the backlight 136 is displayed during the time (time t21 to t22) in which the left-eye image L1 is effectively displayed on the entire screen of the display screen and the message display period (time t22 to t12). It is continuously lit across. Further, the backlight 136 is continuously provided over the time (time t23 to t24) in which the right-eye image R1 is effectively displayed on all the screens of the display screen and the message display period (time t24 to t14). Illuminated.

  When the lighting timing of the backlight 136 is synchronized, even when the liquid crystal shutters 200a and 200b are opened at the timing when the backlight 136 is turned off, the video is not visually recognized by the user. For this reason, in the example of FIG. 8, the liquid crystal shutter 200b for the left eye is opened at the timing (time t11) when the signal is switched from L1a to L1b. Here, time t61 is a time when the liquid crystal shutter 200b starts to open, and time t62 is a time when the liquid crystal shutter 200b is completely opened.

  From time t11 to time t21 is a transition period in which the liquid crystal responds. However, since the backlight 136 is turned off, even if the liquid crystal shutter 200b is opened from time t11, the image during the liquid crystal response is visually recognized by the user. There is nothing. Accordingly, by synchronizing the lighting timing of the backlight 136, the timing of opening the liquid crystal shutters 200a and 200b can be particularly advanced, and the liquid crystal shutters 200a and 200b are actually caused by the response delay of the liquid crystal on the shutter side. Therefore, it is possible to prevent the opening time from being reduced and to secure a desired luminance.

  On the other hand, the liquid crystal shutters 200a and 200b are closed at the same timing as in FIG. 5 so that the message displayed during the message display period is not visually recognized.

  Similarly, the right-eye liquid crystal shutter 200a is opened at the timing (time t13) when the signal switches from R1a to R1b. Here, time t71 is a time when the liquid crystal shutter 200a starts to open, and time t72 is a time when the liquid crystal shutter 200a is completely opened.

  FIG. 9 shows an example in which the lighting timing of the backlight 136 is synchronized in the example of FIG. Also in the example of FIG. 9, the backlight 136 spans the time during which the left-eye image L1 is effectively displayed on the entire display screen (time t43 to t12) and the message display period (time t12 to t44). Continuously lit. Further, the backlight 136 is continuously turned on over the time (time t46 to t14) in which the right-eye image R1 is effectively displayed on the entire display screen and the message display period (time t14 to t47). Is done. Also in this case, the timing of closing the liquid crystal shutters 200a and 200b is the same as that in FIG. 6, but the timing of opening the liquid crystal shutters 200a and 200b can be made earlier. In the example of FIG. 9, the liquid crystal shutter 200b is opened at the timing of time t42, and the liquid crystal shutter 200a is opened at the timing of time t45. Thereby, it is possible to prevent the actual opening time of the liquid crystal shutters 200a and 200b from being reduced due to the delay in the response of the liquid crystal on the shutter side, and it is possible to secure a desired luminance.

[(6) Specific Configuration Example for Improving Message Visibility]
In the message display as described above, if the number of vertical lines in the message display area is increased, the time during which the shutter of the display image viewing glasses 200 is opened is reduced, and the brightness (luminance) of the image visually recognized by the user is reduced. Therefore, it is desirable to keep the message display area to the minimum number of lines.

  Further, the visibility of the message can be further improved by making the background image of the message display area an image that cancels out the previous and subsequent frames. A specific example will be described below.

  First, as a first method, as a background image of the message display area, an image obtained by reversing the image obtained by averaging the previous frame and the next frame is used. As another method, a case where a video obtained by reversing the video in the display area of the previous frame is used, a case where a video obtained by reversing the video in the display area of the next frame is used, and the like can be considered. Further, the background color of the message area may be a predetermined constant color.

When using an image obtained by inverting the average of the preceding and succeeding frames, the RGB values of the background color of each pixel (Pixel) in the message display area are as follows.
RGB_msg (x, y) = RGB (255: 255: 255) − (RGB_prev (x, y) + RGB_next (x, y)) / 2

In the above formula, each variable is as follows.
RGB_msg (x, y): RGB value of the background color of the pixel (Pixel) at the coordinate (x, y) in the message display area in the message display frame RGB (255: 255: 255): White RGB_prev: Previous RGB value of the background color of the pixel at the coordinate (x, y) in the message display area in the frame displayed in (3) RGB_next: The pixel at the coordinate (X, Y) in the message display area in the next frame to be displayed RGB value of the background color of

  According to the above expression, the RGB value of the background color in the current frame is a value obtained by subtracting the average value of the RGB values of the preceding and succeeding frames from white (a value obtained by reversing black and white). The brightness (gray) is (255/2: 255/2: 255/2). Thereby, when the average of a plurality of frames is taken, the background color can be made uniform.

  Although the background color of the message area can be different from the previous and subsequent frames, the value overflows or underflows by using black and white inversion (subtraction from RGB (255: 255: 255)). You can avoid that.

  When displaying a message character or the like, the character color is added to the background color obtained as described above. In this case, it is assumed that the RGB value partially overflows in the character portion, but in this case, an upper limit value can be used.

[(7) Application to plasma display panel]
In the above-described example, an apparatus using a liquid crystal display panel is illustrated as the image display apparatus 100, but the present invention can also be applied to an apparatus using a plasma display panel. FIG. 10 is a timing chart showing switching between left and right images when applied to a plasma display panel.

  In the case of the plasma display panel, since there is almost no response delay like liquid crystal, the subfields of the left-eye image L and the right-eye image R are alternately displayed without performing the above-described double writing. Then, the message display subfield is turned on between the left and right image subfields, and a message is displayed to the user who is not wearing the display image viewing glasses 200.

  As shown in FIG. 10, the left-eye liquid crystal shutter 200b is opened corresponding to the subfield of the left-eye image L, and the right-eye liquid crystal shutter 200a is opened corresponding to the subfield of the right-eye image R. Further, the liquid crystal shutters 200a and 200b are closed in the lighting section of the message display subfield.

  Specifically, as shown in FIG. 10, since the subfield of the right-eye image R is displayed before time t210, the liquid crystal shutter 200b is closed. When the display of the right-eye image R ends at time t210, the right-eye liquid crystal shutter 200a starts to close, and at time t212, the liquid crystal shutter 200a is completely closed. Thereafter, the message display subfield is turned on between time t212 and time t214, and a message is displayed. When the display of the message display subfield ends at time t214, the liquid crystal shutter 200b starts to open, and at time t216, the liquid crystal shutter 200b is completely opened.

  Thereafter, the subfield of the left-eye image L is displayed between times t218 and t220. When the display of the subfield of the left-eye image L ends at t220, the liquid crystal shutter 200b starts to close at time t222, and the liquid crystal shutter 200b at time t224. Is completely closed. Then, the message display subfield is turned on between time t224 and time t226 when the liquid crystal shutter 200b is closed, and a message is displayed.

  Thereafter, when the display of the message display subfield ends at time t226, the liquid crystal shutter 200a starts to open. When the liquid crystal shutter 200a is completely opened at time t228, the subfield of the right-eye image R is displayed in the section from time t230 to t232. As a result, the right-eye image R is visually recognized by the user's right eye.

  When the display of the subfield of the right-eye image R ends at time t232, the liquid crystal shutter 200a starts to close at time t234, and the liquid crystal shutter 200a is completely closed at time t236. Thereafter, the message display subfield is displayed in the section from time t236 to time t238, and the liquid crystal shutter 200b is opened in the section from time t238 to t240.

  As described above, even when applied to a plasma display panel, a user who does not wear display image viewing glasses 200 by closing both the liquid crystal shutters 200a and 200b during the lighting period of the message display subfield. Messages can only be transmitted to

  In the case of a plasma display panel, line-sequential display is not performed as in a liquid crystal panel. Therefore, in a message display subfield, a message may be displayed at a location other than the top or bottom of the screen.

  As described above, according to the present embodiment, in stereoscopic image display, a message can be notified only to a user who does not wear the viewing glasses 200. Therefore, it is possible to prompt the user who is not wearing the viewing glasses 200 to wear the viewing glasses 200 while displaying the stereoscopic video.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 100 Image display apparatus 120a Image | video signal control part 120b Message addition part 134 Liquid crystal display panel 200 Glasses for viewing 200a, 200b Liquid crystal shutter

Claims (10)

A message information adding unit which receives input of signals for the right eye image and the left eye image, and adds predetermined message information to the right eye image and the left eye image;
A signal control unit that outputs a signal for alternately displaying the right-eye image and the left-eye image to which the message information is added;
A display panel that receives the signal output from the signal control unit, displays the right-eye image and the left-eye image alternately, and displays the message information at a timing when the right-eye image and the left-eye image are switched; ,
An image display device comprising:   For viewing glasses having right-eye and left-eye shutters, a timing signal indicating an open period of the right-eye and left-eye shutters is generated, and the right-eye and left-eye are displayed at the timing when the message information is displayed. The image display apparatus according to claim 1, further comprising a spectacles control signal transmission unit that transmits the timing signal for closing both of the shutters.   The image display device according to claim 1, wherein the signal control unit outputs a signal for continuously displaying the right-eye image and the left-eye image at least twice.   The display panel includes a backlight, and includes a backlight control unit that turns on the backlight in accordance with a timing when the right-eye image and the left-eye image are displayed and a timing when the message information is displayed. The image display device described in 1. The display panel is composed of a liquid crystal display panel that performs line-sequential display in the vertical direction of the display screen,
2. The display panel according to claim 1, wherein the display panel displays the message information at an upper or lower end in a vertical direction of the display screen based on a signal of the right-eye image and the left-eye image to which the message information is added. Image display device.   The image display device according to claim 5, wherein the display panel displays the message information at a lower end in a vertical direction of the display screen immediately before a timing at which the signals of the right-eye image and the left-eye image are switched.   The image display device according to claim 5, wherein the display panel displays the message information at an upper end in a vertical direction of the display screen immediately after a timing at which a signal of the right-eye image and a left-eye image is switched.   The said message addition part determines the brightness | luminance of the area | region which adds the said message information based on the brightness | luminance of the frame before and behind the said image for right eyes, and the image for left eyes, and adds the said message information. Image display device. A right-eye image and a left-eye image signal, and a message information adding unit for adding predetermined message information to the right-eye image and left-eye image signals; and the right-eye image to which the message information is added; A signal control unit that outputs a signal for alternately displaying a left-eye image, and a signal output from the signal control unit is input, and a right-eye image and a left-eye image are alternately displayed, and the right-eye image Timing signal indicating the open period of the right-eye and left-eye shutters for a display panel that displays the message information at the timing of switching between the left-eye image and the right-eye and left-eye shutters And the timing signal for closing both the right-eye shutter and the left-eye shutter at the timing when the message information is displayed. An image display device having a spectacles control signal transmitter for transmitting,
Based on the timing signal, the shutters for the right eye and the left eye are alternately opened, and the ornamental glasses that close both the right eye and the left eye shutter at the timing when the message information is displayed,
An image display observation system. Receiving input of right eye image and left eye image signals, and adding predetermined message information to the right eye image and left eye image signals;
Outputting a signal for alternately displaying the right-eye image and the left-eye image to which the message information is added;
The signal output from the signal control unit is input, the right-eye image and the left-eye image are alternately displayed, and the message information is displayed at a timing when the right-eye image and the left-eye image are switched.
An image display method comprising:

Images