JP5529284B2 - Image display device capable of displaying three-dimensional image, and display control device for controlling display of image - Google Patents

Description

  This disclosure relates to control of an image display device capable of displaying a three-dimensional image, and more specifically, this disclosure relates to control of switching between a two-dimensional display and a three-dimensional display.

  Devices that can display a three-dimensional image are known. For example, JP-T-2007-529960 (Patent Document 1) discloses a personal electronic device for 3D acquisition and display (see stage 0002). Japanese Patent Laying-Open No. 2010-050645 (Patent Document 2) discloses an image processing apparatus that can reduce a visual burden that occurs when viewing a video including a large movement that moves the entire screen (of [Summary]). [See Challenge].

Special table 2007-529960 JP 2010-050645 A

  In the case of using a parallax barrier to display a three-dimensional image, the brightness of an image displayed in three dimensions may be lower than the brightness of an image displayed in two dimensions. In addition, when switching from a three-dimensional display to a two-dimensional display, the image may be distorted. Therefore, there is a need for seamless switching between two-dimensional display and three-dimensional display. In another aspect, there is a need for display control for seamlessly switching between two-dimensional display and three-dimensional display.

  According to one embodiment, an image display device capable of displaying a three-dimensional image is provided. The image display device includes a liquid crystal display device, a backlight for supplying light to the liquid crystal display device, a forming unit configured to form a parallax barrier, and a two-dimensional display and a three-dimensional display. And a controller for controlling the luminance of the backlight according to the temporal change characteristic of the brightness of the liquid crystal display device by the formation of the parallax barrier when the display mode is switched.

  Preferably, the controller is configured to control the brightness of the backlight based on a temporal change characteristic according to an inverse function of a function representing the temporal change characteristic.

  Preferably, the controller is configured to control the luminance of the backlight by increasing the current supplied to the backlight by a predetermined magnitude when switching from the two-dimensional display to the three-dimensional display. Has been.

  Preferably, when the controller switches from the two-dimensional display to the three-dimensional display, the signal value for controlling the driving of the forming unit is the rated signal value supplied when the three-dimensional display is performed. If the rated signal value is given, the time required for the forming unit to form the parallax is configured to be shorter than the time required for overshooting.

  Preferably, when the controller switches from the two-dimensional display to the three-dimensional display, the timing at which the signal value is given to the forming unit in order to form the parallax by the forming unit is advanced by a predetermined time. A two-dimensional image is displayed with the barrier formed.

  The controller controls the formation of the parallax barrier by the forming unit by gradually increasing the duty ratio of the signal value given to the forming unit to form the parallax barrier when switching from the two-dimensional display to the three-dimensional display. It is configured as follows.

  Preferably, the image display device further includes a memory for storing image data for displaying an image prepared in advance. The controller is configured to display a predetermined image on the liquid crystal display device based on the data stored in the memory when switching from the two-dimensional display to the three-dimensional display.

  Preferably, the image display device further includes a posture detection unit configured to detect a vertical and horizontal posture of the image display device. The controller is configured to cause the forming unit to form an oblique parallax barrier when the posture of the image display device is switched between vertical and horizontal.

  Preferably, the image display device further includes a sensor configured to detect a vertical and horizontal posture of the image display device. The controller is configured to select a pixel from which data is output in order to display an image according to the rotation of the image display device when the attitude of the image display device is switched between vertical and horizontal.

  Preferably, when the controller switches from the three-dimensional display to the two-dimensional display, the current supplied to the backlight is changed until the brightness of the liquid crystal panel changes after the formation of the parallax barrier is released by the forming unit. It is configured to wait for adjustment.

  According to another embodiment, a display control device is provided that is connected to a display device capable of displaying a three-dimensional image by forming a parallax barrier and controls display of an image by the display device. The display device includes a liquid crystal display device, a backlight for supplying light to the liquid crystal display device, and a forming unit for forming a parallax barrier. The display control device forms a parallax barrier when a display mode is switched between a communication circuit configured to communicate a control signal with the display device and a two-dimensional display and a three-dimensional display. And a controller for controlling the luminance of the backlight according to the temporal change characteristic of the brightness of the liquid crystal display device.

  Preferably, the controller is configured to control the brightness of the backlight based on a temporal change characteristic according to an inverse function of a function representing the temporal change characteristic.

  Preferably, the controller is configured to control the luminance of the backlight by increasing the current supplied to the backlight by a predetermined magnitude when switching from the two-dimensional display to the three-dimensional display. Has been.

  Preferably, when the controller switches from the two-dimensional display to the three-dimensional display, the signal value for controlling the driving of the forming unit is the rated signal value supplied when the three-dimensional display is performed. If the rated signal value is given, the time required for the forming unit to form the parallax is configured to be shorter than the time required for overshooting.

  Preferably, when the controller switches from the two-dimensional display to the three-dimensional display, the timing at which the signal value is given to the forming unit in order to form the parallax by the forming unit is advanced by a predetermined time. A two-dimensional image is displayed with the barrier formed.

  Preferably, when the controller switches from the two-dimensional display to the three-dimensional display, the formation of the parallax barrier by the forming unit is performed by gradually increasing the duty ratio of the signal value given to the forming unit to form the parallax barrier. Is configured to control.

  Preferably, the display control device further includes a memory for storing image data for displaying an image prepared in advance. The controller is configured to display a predetermined image on the liquid crystal display device based on the data stored in the memory when switching from the two-dimensional display to the three-dimensional display.

  Preferably, when the controller switches from the three-dimensional display to the two-dimensional display, the current supplied to the backlight is changed until the brightness of the liquid crystal panel changes after the formation of the parallax barrier is released by the forming unit. It is configured to wait for adjustment.

  According to the image display device according to a certain aspect, switching between the two-dimensional display and the three-dimensional display is performed seamlessly. According to the display control device according to another aspect, switching between the two-dimensional display and the three-dimensional display is performed seamlessly.

  The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention taken in conjunction with the accompanying drawings.

It is a figure showing the state in which the mobile telephone 100 was opened. It is a figure showing the state by which the mobile telephone 100 was folded. 2 is a block diagram illustrating a hardware configuration of mobile phone 100. FIG. It is a figure for demonstrating the luminance change at the time of switching between 2D display and 3D display. It is a figure showing the structure of the display 150 in case the display 150 can display an image according to the attitude | position in any of a portrait orientation and a landscape orientation. It is a figure for demonstrating the improper display of the image in the case of switching from 2D display to 3D display. FIG. 6 is a diagram illustrating operating characteristics of the mobile phone 100. It is a figure showing the operating characteristic of the mobile telephone 100 according to another situation. It is a figure showing the operational characteristic of the mobile telephone 100 according to another situation. It is a figure showing the operational characteristic of the mobile telephone 100 according to another situation. It is a figure showing the operational characteristic of the mobile telephone 100 according to another situation. It is a figure showing the parallax barrier formed when the mobile telephone 100 which is performing three-dimensional display is rotated about 90 degree | times clockwise. It is a figure showing arrangement | positioning of a pixel when the mobile telephone 100 which is performing three-dimensional display is rotated about 90 degree | times clockwise. FIG. 6 is a diagram (No. 1) for describing a change in brightness of display 150; FIG. 11 is a second diagram illustrating a change in brightness of display 150. It is FIG. (1) for demonstrating the other response | compatibility to a brightness change. It is FIG. (2) for demonstrating the other response | compatibility to a brightness change. It is a figure showing the structure of CPU310 in detail. It is a figure showing the image reproduction apparatus 1900 and the three-dimensional display apparatus 190. FIG. FIG. 10 is a diagram (No. 1) illustrating control when the display mode of an image by mobile phone 100 is switched from three-dimensional display to two-dimensional display. FIG. 11 is a diagram (No. 1) illustrating control when switching from three-dimensional display when mobile phone 100 is in the vertical direction to three-dimensional display when it is in the horizontal direction; It is FIG. (2) showing the control at the time of switching from a three-dimensional display to a two-dimensional display. It is FIG. (The 3) showing the control at the time of switching from a three-dimensional display to a two-dimensional display. It is FIG. (4) showing the control at the time of switching from a three-dimensional display to a two-dimensional display. FIG. 11 is a diagram (No. 2) showing control when switching from three-dimensional display when mobile phone 100 is in the vertical direction to three-dimensional display when it is in the horizontal direction;

  Hereinafter, embodiments will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  In the present embodiment, the mobile phone 100 is exemplified, but other mobile communication terminals, for example, PDAs, electronic dictionaries and other information processing terminals, and at least three-dimensional display is possible using a parallax barrier. As long as the apparatus has a display device, the technical idea according to the present embodiment can be applied. For example, the technical idea can be applied to a television, a PC monitor, a portable game device, and the like.

  In another aspect, the present invention can also be applied to a device that does not include a display device and outputs an image, such as a hard disk recording / reproducing device, a Blu-ray disc recording / reproducing device, or the like. In this case, the technical idea is applied by a combination of the device and an external display device connected to the device (for example, a television capable of three-dimensional display using a parallax barrier). In this case, when the device sends a video signal to the external display device, the device also sends a signal for controlling the formation of the parallax barrier of the external display device. In this case, the technical idea is specifically realized as an image display control circuit, for example. Alternatively, in another aspect, the processor included in the device is realized as cooperation between hardware and software by executing a program for control.

  A configuration of mobile phone 100 according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing a state in which mobile phone 100 is opened. FIG. 2 is a diagram illustrating a state in which the mobile phone 100 is folded.

  As shown in FIG. 1, the mobile phone 100 includes housings 110 and 120 and a biaxial hinge 130. The biaxial hinge 130 is configured to move the housing 110 in the biaxial direction with respect to the housing 120. One of the two axes is for opening and closing the housing 110 and the housing 120, and the other one is for the housing 110 with respect to the housing 120 around the rotation axis in the longitudinal direction. It is a hinge for rotating.

  The mobile phone 100 further includes a speaker 140, a touch panel display 150, a plurality of buttons 160, and a microphone 170. The speaker 140 is attached to the housing 110. The touch panel display 150 is attached to the housing 110. The display 150 is a liquid crystal type, organic EL (Electroluminescence) type, or other display device. When the mobile phone 100 is in an opened state (also referred to as “first state”), the display 150 is moved in the same direction as the surface on which the plurality of buttons 160 are arranged and the direction of the back surface by the biaxial hinge 130. It is configured to face both.

  The plurality of buttons 160 are configured as switches that accept input of commands to the mobile phone 100. In one aspect, the button 160 is implemented as a physical key, but in another aspect, some or all of the plurality of buttons 160 may be implemented as software keys.

  Referring to FIG. 2, mobile phone 100 according to the present embodiment is also configured so that display 150 faces the outside of mobile phone 100 when folded. That is, the housing 110 is rotated 180 ° in the longitudinal direction with respect to the biaxial hinge 130 in the state shown in FIG. Further, the housing 110 is rotated around the other axis of the biaxial hinge 130. Thereafter, the housing 110 and the housing 120 are closed. Then, as shown in FIG. 2, the display 150 appears outside the mobile phone 100, and the button 160 is hidden inside.

  In the present embodiment, the mobile phone 100 is a foldable type, but in another aspect, the mobile phone 100 is a slidable type configured such that one casing slides relative to another casing. Also good. In still another aspect, a tablet-type or straight-type terminal device may be applied.

  With reference to FIG. 3, the hardware configuration of mobile phone 100 according to the present embodiment will be described. FIG. 3 is a block diagram showing a hardware configuration of mobile phone 100. The mobile phone 100 includes a communication device 302, a tuner 304, antennas 306 and 308, a CPU (Central Processing Unit) 310, a positioning processing unit 312 and a positioning signal receiving front end in addition to the configuration shown in FIG. Unit 314, GPS (Global Positioning System) antenna 316, camera 320, flash memory 344, RAM (Random Access Memory) 346, ROM (Read Only Memory) 348, audio signal processing circuit 370, LED ( Light Emitting Diode) 376, a memory card driving device 380, a data communication I / F (Interface) 378, and a vibrator 384. A memory card 382 can be attached to the memory card driving device 380.

  The antenna 306 receives a one-segment broadcasting wave. The tuner 304 selects a program in accordance with an instruction from the CPU 310 and transmits a video signal and an audio signal to the CPU 310.

  The signal received by the antenna 308 is subjected to front-end processing by the communication device 302, and the processed signal is sent to the CPU 310. CPU 310 executes processing for controlling the operation of mobile phone 100 based on a command given to mobile phone 100. The CPU 310 executes a predetermined process based on the signal sent from the communication device 302 and sends the processed signal to the audio signal processing circuit 370. The audio signal processing circuit 370 performs predetermined signal processing on the signal and sends the processed signal to the speaker 140. The speaker 140 outputs sound based on the signal.

  The microphone 170 receives an utterance from the mobile phone 100 and sends a signal corresponding to the uttered voice to the voice signal processing circuit 370. The audio signal processing circuit 370 executes processing specified in advance for a call based on the signal, and sends the processed signal to the CPU 310. CPU 310 converts the signal into data for transmission, and sends the converted data to communication device 302. Communication device 302 generates a signal for transmission using the data, and sends the signal to antenna 308.

  The flash memory 344 stores data sent from the CPU 310. Further, the CPU 310 reads data stored in the flash memory 344 and executes a predetermined process using the data.

  RAM 346 temporarily holds data generated by CPU 310 based on an operation performed on button 160. ROM 348 stores a program or data for causing mobile phone 100 to execute a predetermined operation. CPU 310 reads the program or data from ROM 348 and controls the operation of mobile phone 100.

  The memory card driving device 380 reads out data stored in the memory card 382 and sends it to the CPU 310. Conversely, the memory card driving device 380 writes the data output by the CPU 310 into the empty area of the memory card 382.

  The audio signal processing circuit 370 executes signal processing for a call as described above. In the example shown in FIG. 3, the CPU 310 and the audio signal processing circuit 370 are shown as separate configurations. However, in other aspects, the CPU 310 and the audio signal processing circuit 370 may be configured as an integral unit. Good.

  The display 150 is a touch panel display, but the mechanism of the touch panel is not particularly limited. Based on data acquired from CPU 310, display 150 displays an image defined by the data. For example, attributes of still images, moving images, and music files stored in the flash memory 344 (name of the file, performer, performance time, etc.) are displayed.

  The LED 376 realizes a predetermined light emission operation based on a signal from the CPU 310. For example, when the LED 376 can display a plurality of colors, the LED 376 emits light in a color associated with data included in a signal output from the CPU 310. The mode of light emission (interval, number of light emission colors, blinking pattern, etc.) is not particularly limited.

  The data communication I / F 378 accepts attachment of a data communication cable. The data communication I / F 378 sends a signal output from the CPU 310 to the cable. Alternatively, the data communication I / F 378 sends data received via the cable to the CPU 310.

  Vibrator 384 performs an oscillating operation at a predetermined frequency based on a signal output from CPU 310.

  The GPS antenna 316 receives a signal transmitted from a GPS satellite and sends the received signal to the positioning signal reception front end unit 314. The positioning signal reception front end unit 314 performs pattern matching based on each signal received from at least three (preferably four or more) GSP satellites, and the code pattern included in each signal and the code held by the mobile phone 100 When the pattern matches, the signal is sent to the positioning processing unit 312.

  The positioning processing unit 312 performs positioning processing using the signal, and calculates the position of the mobile phone 100 that has received the signal. CPU 310 displays the calculation result on display 150. In one aspect, the display 150 may display the position information (for example, latitude, longitude, altitude, etc.) of the mobile phone 100 calculated by the positioning processing unit 312 on the map. In another aspect, the display 150 may superimpose and display an image of a place taken by the camera 320 and position information of the place.

  With reference to FIG. 4, a description will be given of a luminance change by the mobile phone 100 according to the present embodiment. FIG. 4 is a diagram for explaining a change in luminance at the time of switching between the two-dimensional display and the three-dimensional display.

  As shown in the graph A, when control (LCD control) for switching the display 150 between two-dimensional display (2D) and three-dimensional display (3D) is performed, the backlight current (BL current) is usually A certain level. In this case, the luminance (that is, the appearance) is about 50% when the luminance in the two-dimensional display is 100%. This is because, as shown in states B and C, the parallax barriers 420, 421, 422, and 423 are 3 in the switching liquid crystal 410 disposed in the upper part (display output direction) of the liquid crystal display panel 400 included in the display 150. This is because the amount of light emitted from the liquid crystal display panel 400 is reduced during the three-dimensional display.

  With reference to FIG. 5, the luminance change will be further described. FIG. 5 is a diagram illustrating the configuration of the display 150 when the display 150 can display an image in accordance with the orientation of the display 150 in both the vertical and horizontal directions.

  In FIG. 5, as shown in state A, when the display 150 is in the vertically long direction, parallax barriers 520, 521, 522, and 523 are formed to form the slits 510, 511, and 512. As shown in state B of FIG. 5, when the display 150 is in the landscape orientation, parallax barriers 530, 531, 532, and 533 are formed to form the slits 540, 541, and 542. Each width of the slits 510, 511, 512 is larger than each width of the slits 540, 541, 542. Therefore, in the example shown in FIG. 5, the luminance when the mobile phone 100 is in the vertical direction is larger than the luminance when the mobile phone 100 is in the horizontal direction. Therefore, when the mobile phone 100 displaying a three-dimensional image in a vertically long posture is rotated about 90 degrees to change the posture in the horizontal direction, the luminance is lowered.

  Next, an inappropriate display of an image when the display is switched will be described with reference to FIG. FIG. 6 is a diagram for explaining inappropriate display of an image when switching from a two-dimensional display to a three-dimensional display.

  As shown in the graph 601, when the control (LCD control) for switching the display 150 between the two-dimensional display (2D) and the three-dimensional display (3D) is performed, the parallax barrier is changed as shown in the graph 602. Barrier control for forming is performed. In the barrier control, when a command for instructing the formation of a parallax barrier is given at time TA as shown by a solid line, a delay occurs because it actually takes time to form the parallax barrier. This is because the response speed of the parallax barrier is about 2 to 3 frames and is about 40 msec. As a result, it is formed at time TB as indicated by the dotted line. Therefore, as shown in the graph 603, the 3D image 610 in a state where the parallax barrier is not completely formed is displayed between the time TA and the time TB. This can be understood from the fact that when the parallax barrier 630 is applied to the image 620 for three-dimensional display, an image 640 for the left eye and an image 650 for the right eye are formed.

  With reference to FIG. 7, the characteristics of mobile phone 100 according to the present embodiment will be described. FIG. 7 is a diagram showing operating characteristics of the mobile phone 100.

  In one aspect, assume that the display area blocked by the parallax barrier is about half of the display area of the display 150. In this case, as shown in the graph 701, when the control (LCD control) for switching the display 150 between the two-dimensional display (2D) and the three-dimensional display (3D) is performed, as shown in the graph 702, The magnitude of the backlight current (BL current) in the three-dimensional display is twice the magnitude of the backlight current in the two-dimensional display. As a result, since the luminance in the half area is doubled, the luminance in the display 150 is approximately the same as the luminance before switching, and therefore, between the two-dimensional display and the three-dimensional display as shown in the graph 703. Smooth switching is realized.

  With reference to FIG. 8, characteristics of mobile phone 100 in another aspect will be described. FIG. 8 is a diagram illustrating operating characteristics of mobile phone 100 according to another aspect.

  As shown in the graph 801, when control (LCD control) for switching the display 150 between two-dimensional display (2D) and three-dimensional display (3D) is performed, the voltage applied to form the parallax barrier is As shown in graph 802, overshooted voltage value VMAX is given at time TA. This is larger than the voltage value VC given in the steady state where the three-dimensional display is stably realized. In this case, as shown in the graph 803, the parallax barrier is formed at the time TC, and therefore is earlier than the time TB at which the parallax barrier is formed when the voltage value VMAX is not given. As a result, the time for forming an inappropriate image is shortened.

  With reference to FIG. 9, a mobile phone 100 according to still another aspect will be described. FIG. 9 is a diagram illustrating operating characteristics of mobile phone 100 according to still another aspect.

  As shown in the graph 901, when control (LCD control) for switching the display 150 between the two-dimensional display (2D) and the three-dimensional display (3D) is performed, the barrier control for forming the parallax barrier is: As shown in the graph 902, the process starts from time TD. In this case, as shown in the graph 903, the display 150 displays the two-dimensional image 910 including the shutter until the switching to the three-dimensional display is completed at the time TA. Since the two-dimensional image 910 including the shutter has better visibility than the three-dimensional image including no shutter, the impact on the user caused by the image generated when the parallax barrier is formed can be reduced.

  With reference to FIG. 10, a mobile phone 100 according to still another aspect will be described. FIG. 10 is a diagram illustrating operating characteristics of mobile phone 100 according to still another aspect.

  As shown in the graph 1001, when control (LCD control) for switching the display 150 between two-dimensional display (2D) and three-dimensional display (3D) is performed, the switching liquid crystal operates to form a parallax barrier. A voltage is given. At this time, as shown in the graph 1002, the duty ratio is gradually increased, for example, 50% when time TB is reached. At this time, as shown in a region 1010, the suggested amount is gradually adjusted. As a result, as shown in a graph 1003, an image 1020 in a transition period in which the two-dimensional image is switched to the three-dimensional image is displayed between the time TA and the time TB. In this case, the user of the mobile phone 100 can gradually get used to the change from the two-dimensional display to the three-dimensional display.

  With reference to FIG. 11, the operation of mobile phone 100 in still another aspect will be described. FIG. 11 is a diagram illustrating operating characteristics of mobile phone 100 according to still another aspect.

  As shown in the graph 1011, when control (LCD control) for switching the display 150 between the two-dimensional display (2D) and the three-dimensional display (3D) is performed, the time required for forming the parallax barrier is transient. State 1110 is formed. At this time, as shown in the graph 1012, as barrier control, the drive signal is given to the switching liquid crystal 410 in a manner that gradually increases from time TA to time TB. At this time, as shown in the graph 1013, the display 150 displays an image 1120. Since the transition state 1110 is a state in which the parallax barrier is not completely formed, the CPU 310 performs, for example, an all-black screen, a symbol, or other two-dimensional display as the image 1120 based on the data held in the RAM 346. In addition, a picture or a character that is visible in both of the three-dimensional display is displayed on the display 150. This data is read from the flash memory 344, ROM 348 or other non-volatile data recording medium, or obtained by the mobile phone 100 from the outside by a communication signal or other signals. By displaying such a picture or character, the user can recognize the switching between the two-dimensional display and the three-dimensional display.

  In the above description, the case where the mobile phone 100 is switched from the two-dimensional display to the three-dimensional display has been described. However, such a technical idea may be applied when switching from the three-dimensional display to the two-dimensional display. .

  That is, if it is FIG. 7, what is necessary is just to make it 1/2 times the magnitude | size of the backlight electric current in three-dimensional display, if it is FIG. The duty ratio may be gradually lowered. These specific controls will be described in detail with reference to FIGS.

  Next, the operation of the mobile phone 100 in still another aspect will be described with reference to FIG. FIG. 12 is a diagram illustrating a parallax barrier formed when the mobile phone 100 performing three-dimensional display is rotated approximately 90 degrees clockwise.

  When three-dimensional display is performed when the mobile phone 100 is held in the vertical direction, the parallax barriers 1210, 1220, 1230, and 1240 are formed in the vertical direction as shown in the state A. When the mobile phone 100 according to this aspect is rotated clockwise in this state, the parallax barriers 1210, 1220, 1230, and 1240 are rotated at an angle of rotation when, for example, rotated about 45 degrees as shown in state B. It is formed with a corresponding inclination (that is, about 45 degrees). After that, when the cellular phone 100 is further rotated to the horizontal direction, as shown in the state C, the parallax barriers 1210, 1220, 1230, and 1240 are formed in the horizontal direction. In this way, even if the display 150 displaying the three-dimensional image is rotated, the three-dimensional image is displayed even at a position in the middle of the rotation (state B). Therefore, even when the attitude of the mobile phone 100 is switched, a three-dimensional image is appropriately displayed.

  In addition, in FIG. 12, although the state rotated about 45 degree | times as a position in the middle of rotation is illustrated, as a position in the middle of rotation, it is not restricted to this. The parallax barrier may be formed at more positions. For example, in still another aspect, when the rotation angle is approximately 30 degrees or 60 degrees, the mobile phone 100 may be provided with a parallax barrier corresponding to the angle.

  Next, the operation of the mobile phone 100 in still another aspect will be described with reference to FIG. FIG. 13 is a diagram illustrating an arrangement of pixels when the mobile phone 100 performing three-dimensional display is rotated about 90 degrees clockwise.

  As shown in state A, when three-dimensional display is performed when the mobile phone 100 is held in the vertical direction, the mobile phone 100 displays an image (L) for the left eye in the region 1310, and the right eye An image (R) for use is displayed in area 1320. At this time, it is assumed that an RGB array 1350 is formed from the left direction to the right direction in both the left-eye image and the right-eye image.

  As shown in the state B, when the mobile phone 100 according to this aspect is rotated about 45 degrees in the clockwise direction, the image (L) for the left eye is displayed in the region 1330 according to the rotation position. Thereafter, the mobile phone 100 is further rotated (state C), rotated 90 degrees, and turned to the horizontal direction (state D). The display 150 displays a three-dimensional image in a horizontally long state. That is, the image for the left eye is displayed in area 1330, and the image for the right eye is displayed in area 1310.

  In this case, the region where the left eye region 1310 is displayed is different in states A, B, and C. Such a change of the area is performed according to the rotation angle of the mobile phone 100 by detecting the rotation position in a certain situation. For example, when the posture of the mobile phone 100 changes from the position shown in the state A to the position shown in the state B, the mobile phone 100 displays a plurality of regions (for example, regions 1330 and 1320) arranged on the left and right. Detect.

  The same area is also detected when the cellular phone 100 is further rotated and is at the position shown in FIG. Thereafter, when the mobile phone 100 rotates about 90 degrees, regions 1330 and 1310 are detected as regions arranged in the left-right direction. In this case, since the group of the regions 1340 and 1320 is also arranged on the left and right, the regions 1340 and 1320 may be detected. In this aspect, since the group of areas 1330 and 1310 comes above the group of areas 1340 and 1320, CPU 310 displays an image for three-dimensional display in areas 1330 and 1310.

  A change in brightness of the display 150 will be described with reference to FIGS. 14 and 15. Graph A is a diagram showing a change in brightness of display 150 when a parallax barrier is formed. When a command for forming a parallax barrier is given to the switching liquid crystal 410 at time T1, the brightness decreases as the parallax barrier is formed. When the formation of the parallax barrier is completed at time T3, the brightness in the case where the three-dimensional display is constantly performed is maintained.

  Graph B represents a change in brightness of display 150 when the brightness of the backlight is controlled according to the present embodiment. When the display of the image is switched from the two-dimensional display to the three-dimensional display at time T1, the backlight current command value is increased. As a result, as shown in graph B, the brightness of the display 150 increases in response to an increase in the backlight current. When the backlight current reaches a certain level at time T2, the brightness of the display 150 is maintained.

  Therefore, when the characteristics shown in graph A and graph B are used, as shown in graph C, the brightness increases from time T1 to T2, and thereafter the brightness decreases from time T2 to time T3. Therefore, an increase or decrease in brightness may be recognized as “flicker”.

  Thus, with reference to FIG. 15, a description will be given of how to deal with such flickering of brightness. Graph A and graph B correspond to graph A and graph B in FIG. 14, respectively. Graph C is a diagram showing correspondence to changes in brightness.

  As shown in the graph A, when the change in brightness in switching from the two-dimensional display to the three-dimensional display is expressed, for example, as a function LD · f (t−T1) (t represents time), the graph C As shown, backlight control is performed according to a function LB · 1 / f (t−T1) that gives the inverse of the value of the function. That is, from time T1 to time T4, the backlight is controlled with the backlight current value based on the function LB · 1 / f (t−T1). In this way, the brightness change shown in the graph A and the brightness change shown in the graph C are offset, and as shown in FIG. 15D, a constant brightness (LD · LB) is obtained. Realized. In this case, time T3 = T4. In this way, flicker caused by a change in brightness can be suppressed.

An approximate function may be used as the function that gives the reciprocal.
Next, a change in brightness of the display 150 will be described with reference to FIGS. 16 and 17. Graph A in FIG. 16 is a diagram illustrating a change in brightness of the display 150 when the parallax barrier is formed. When a command for forming a parallax barrier is given to the switching liquid crystal 410 at time T1, the brightness decreases as the parallax barrier is formed. However, in this embodiment, the brightness of the display 150 remains after the command. The case where the timing when the brightness is held for a certain period and the brightness decreases is after time T5, that is, the case where the command and the parallax barrier formation reaction are not the same time. When the formation of the parallax barrier is completed at time T3, the brightness in the case where the three-dimensional display is constantly performed is maintained.

  Graph B represents a change in brightness of display 150 when the brightness of the backlight is controlled according to the present embodiment. When the display of the image is switched from the two-dimensional display to the three-dimensional display at time T1, the backlight current command value is increased. As a result, as shown in graph B, the brightness of the display 150 increases in response to an increase in the backlight current. When the backlight current reaches a certain level at time T2, the brightness of the display 150 is maintained.

  Therefore, using the characteristics shown in graph A and graph B, as shown in graph C, the brightness increases from time T1 to T2, and thereafter the brightness is kept constant from time T2 to time T5. Brightness decreases from time T5 to time T3. Therefore, an increase or decrease in brightness may be recognized as “flicker”.

  Accordingly, with reference to FIG. 17, a description will be given of how to deal with such flickering of brightness. Graph A and graph B correspond to graph A and graph B in FIG. Graph C is a diagram showing correspondence to changes in brightness.

  As shown in the graph A, when the change in brightness in switching from the two-dimensional display to the three-dimensional display is expressed, for example, as a function LD · g (t−T1) (t represents time), the graph C As shown, backlight control is performed according to a function LB · 1 / g (t−T1) that gives the inverse of the value of the function. That is, the backlight is controlled with the backlight current value based on the function LB · 1 / g (t−T1) from time T1 to time T5. In this way, the brightness change shown in the graph A and the brightness change shown in the graph C are offset, and a constant brightness (LD · LB) is realized as shown in the graph D. . In this case, time T5 = T6. Thereby, the flicker resulting from the change of brightness can be suppressed. After time T6, flicker can be suppressed by using the embodiment described in FIG. 14 and FIG.

  Note that when the change in brightness in switching from the two-dimensional display to the three-dimensional display can be approximated to a constant, the function that gives the reciprocal is not a function, and the reciprocal may be used.

  In the above description, the case where the mobile phone 100 is switched from the two-dimensional display to the three-dimensional display has been described. However, such a technical idea may be applied when switching from the three-dimensional display to the two-dimensional display. . That is, in FIG. 14 to FIG. 17, “flickering” is suppressed by controlling the backlight current value so as to follow the function that gives the reciprocal.

  With reference to FIG. 18, CPU 310 realizing mobile phone 100 according to the present embodiment will be described. FIG. 18 is a diagram showing the configuration of CPU 310 in detail. CPU 310 includes buffers 1710 and 1720, a parallax determination unit 1730, and an image processing unit 1740. The buffer 1710 and the parallax determination unit 1730 are connected to the RAM 346. The output of the buffer 1710 is connected to the input of the buffer 1720, the input of the parallax determination unit 1730, and the input of the image processing unit 1760, respectively. The output of the buffer 1720 is connected to the input of the parallax determination unit 1730 and the input of the image processing unit 1740, respectively.

  The input of the parallax determination unit 1730 is connected to the output of the RAM 346, the output of the buffer 1710, and the output of the buffer 1720, respectively. The output of the parallax determination unit 930 is connected to the input of the image processing unit 1740. The output of the image processing unit 1740 is connected to the display 150.

  In one aspect, the buffers 1710 and 1720 each hold data for one pixel of the image data stored in the RAM 346. The parallax determination unit 1730 detects switching between the two-dimensional display and the three-dimensional display. In one aspect, the parallax determination unit 1730 is based on the image data for the left eye and the image data for the right eye based on the data stored in the buffers 1710 and 1720 and the data read from the RAM 346, respectively. It is determined whether or not parallax exists.

  The image processing unit 1740 generates data for displaying an image based on the image data for the left eye and the image data for the right eye. More specifically, first, the image processing unit 1740 detects the attitude of the mobile phone 100. This detection is performed based on the output of the gyro sensor, for example.

  When the display mode is switched between the two-dimensional display and the three-dimensional display, the image processing unit 1740 displays the backlight according to the temporal change characteristic of the brightness of the liquid crystal display device due to the formation of the parallax barrier. It is configured to control the brightness.

  In another aspect, the image processing unit 1740 is configured to control the luminance of the backlight based on a temporal change characteristic according to an inverse function of a function representing the temporal change characteristic.

  In another aspect, the image processing unit 1740 is configured to control the luminance of the backlight by increasing the current supplied to the backlight by a predetermined magnitude.

  In another aspect, when the image processing unit 1740 switches from the two-dimensional display to the three-dimensional display, the signal value for controlling the driving of the switching liquid crystal 410 is displayed when the three-dimensional display is performed. By overshooting the supplied rated signal value, the time required for the switching liquid crystal 410 to form parallax is configured to be shorter than the time required when the rated signal value is given.

  In another aspect, when the image processing unit 1740 switches from the two-dimensional display to the three-dimensional display, the timing at which the signal value is given to the switching liquid crystal 410 so that the switching liquid crystal 410 forms a parallax is determined in advance. It is configured to display a two-dimensional image in a state where a parallax barrier is formed by advancing by time.

  In another aspect, when the image processing unit 1740 switches from the two-dimensional display to the three-dimensional display, the switching is performed by gradually increasing the duty ratio of the signal value given to the switching liquid crystal 410 to form the parallax barrier. The liquid crystal 410 is configured to control the formation of a parallax barrier.

  In another aspect, the RAM 346 holds image data for displaying an image prepared in advance. The image processing unit 1740 is configured to display a predetermined image on the liquid crystal display device based on data stored in the RAM 346 when switching from the two-dimensional display to the three-dimensional display. Data held in the RAM 346 is stored in the flash memory 344 or other non-volatile storage medium. Alternatively, the data may be input from the outside of the mobile phone 100 via the data communication I / F 378 or other interface.

  In another aspect, the mobile phone 100 may further include a posture detection circuit for detecting the posture, for example, a gyro sensor. At this time, the image processing unit 1740 is configured to form an oblique parallax barrier in the switching liquid crystal 410 when the orientation of the mobile phone 100 is switched between vertical and horizontal. In another aspect, the image processing unit 1740 selects a pixel from which data is output to display an image according to the rotation of the image display device when the posture of the image display device is switched between vertical and horizontal. Is configured to do.

  In another aspect, when the image processing unit 1740 switches from the three-dimensional display to the two-dimensional display, the backlight until the brightness of the liquid crystal panel changes after the formation of the parallax barrier by the switching liquid crystal 410 is canceled. Is configured to wait for adjustment of the current supplied to.

  Instead of the configuration shown in FIG. 18, a combination of circuit elements that realize each process executed by the image processing unit 1740 may be used.

<Modification>
Next, a modification of the above embodiment will be described. As described above, the application of the technical idea according to the present embodiment is not limited to a mobile phone or other terminals. That is, in the above embodiment, a control device (CPU 310) for controlling switching between two-dimensional and three-dimensional display, and a display device (display 150) that can display a three-dimensional image by forming a parallax barrier. ) Is included in one device (mobile phone 100). However, the control device and the display device may be included in separate devices.

  Thus, with reference to FIG. 19, an image reproduction device 1900 according to a modification of the present embodiment will be described. FIG. 19 is a diagram illustrating an image reproduction device 1900 and a three-dimensional display device 190. The image playback device 1900 is realized as, for example, a DVD (Digital Versatile Disc) player, a DVD recorder, a BD (Blu-ray Disc) player, a BD recorder, an HDD (Hard Disk Drive) recorder, or an image control circuit. The three-dimensional display device 1990 is a television, PC (Personal Computer) monitor, or other display device capable of three-dimensional display.

  An image reproduction device 1900 according to this modification includes a tuner 304, a CPU 310, a RAM 346, a ROM 348, an audio signal processing circuit 370, a memory card drive device 380, an infrared communication device 1902, a disk drive device 1920, and an HDD 1944. A monitor 1950, an audio output 1940, an audio input 1970, and a data communication I / F 1978. The same hardware as that shown in FIG. 3 is denoted by the same reference numeral. Therefore, those descriptions are not repeated.

  The infrared communication device 1902 receives an infrared signal for controlling the operation of the image reproduction device 1900. In another aspect, Bluetooth or other signals may be used for control signal communication instead of infrared communication.

  The disk drive 1920 accepts the mounting of the optical disk 1922. The optical disk 1922 is a DVD, BD or other disk. The optical disk 1922 stores data for three-dimensional display and is read by the disk drive device 1920. The HDD 1944 stores image data.

  The audio input 1970 is an interface for receiving an input of an audio signal from the outside of the image reproduction apparatus 1900. The audio output 1940 is an interface for outputting audio to the outside of the image reproduction apparatus 1900 (for example, a television, headphones, etc.).

  The monitor 1950 is disposed on the front surface of the housing of the image reproduction device 1900 and displays the operation state of the image reproduction device 1900.

  The data communication I / F 1978 communicates control signals with the three-dimensional display device 1990 and other display devices. In one aspect, the data communication I / F 1978 is, for example, HDMI (High-Definition Multimedia Interface), but other communication standards may be used. In one aspect, the data communication I / F 1978 sends a signal for controlling switching between two-dimensional and three-dimensional display to the three-dimensional display device 1990.

  The three-dimensional display device 1990 includes a data communication I / F 1991, a CPU 1992, and a liquid crystal display 1993. The data communication I / F 1991 communicates control signals in the same manner as the data communication device 1978. In one aspect, the data communication apparatus 1991 receives a signal for controlling switching of image display on the liquid crystal display 1993 between the two-dimensional display and the three-dimensional display from the data communication I / F 1978.

  The CPU 1992 controls the formation of the parallax barrier by the liquid crystal display 1993 based on the control signal sent from the data communication I / F 1991. This mode of control is as described in the previous embodiment.

  As described above, according to mobile phone 100 according to the present embodiment or image reproduction device 1900 according to the present modification, switching between two-dimensional display and three-dimensional display is performed seamlessly. Therefore, flicker caused by a change in brightness is also suppressed.

  Here, with reference to FIGS. 20-25, said embodiment is further demonstrated. 20 to 25 are diagrams illustrating control when switching from the three-dimensional display to the two-dimensional display.

  Referring to FIG. 20, it is assumed in one aspect that the luminance of the liquid crystal panel when three-dimensional display is performed is about 50% of the luminance when two-dimensional display is performed. In this case, when control (LCD control) for switching the display 150 between three-dimensional display (3D) and two-dimensional display (2D) is performed (graph 2001), the backlight current (BL in the two-dimensional display after switching) The magnitude of (current) is about 50% of the magnitude of the backlight current in the three-dimensional display (graph 2002). As a result, the luminance in the region twice as large as the region before switching is about 50%, so that the luminance in the display 150 is approximately the same as the luminance before switching. As a result, seamless switching from 3D display to 2D display is realized (graph 2003). Note that the numerical value of 50% is for illustrative purposes only. Therefore, the value of the output level of the backlight current (about 50% in the above case) may be further corrected according to changes in operating characteristics and luminance.

  FIG. 21 is a diagram illustrating a state in which the mobile phone 100 displaying a three-dimensional image is rotated from the vertical direction to the horizontal direction. Here, it is assumed that the luminance when the mobile phone oriented horizontally is three-dimensionally displayed is about 95% of the luminance when the cellular phone is oriented vertically.

  When the mobile phone 100 is rotated from the vertical direction to the horizontal direction (graph 2101), the three-dimensional display mode (that is, the parallax barrier formation mode) is changed. At this time, since the luminance is reduced to about 95% in a certain aspect, the backlight current value increases to the extent that the decrease is compensated. In this aspect, the backlight current value is increased by about 5%, and is about 105% when arranged in the vertical direction (graph 2102). As a result, since the decrease in luminance (about 5%) due to the change in the parallax barrier formation mode is complemented by the increase in current value (about 5%), the orientation of the display 150 changes from the vertical direction to the horizontal direction. Even if it changes, seamless switching is realized (graph 2103).

  FIG. 22 is a diagram illustrating another control when the display by the mobile phone 100 is switched from the three-dimensional display to the two-dimensional display. When the display on the display 150 is switched from three dimensions to two dimensions (graph 2201), as shown in the graph 2202, the operating voltage value applied to control the formation of the parallax barrier is changed. Specifically, when switching from a three-dimensional display to a two-dimensional display, a voltage value at a level lower than the operating voltage value given in the two-dimensional mode is given to the switching liquid crystal 410 to form a parallax barrier. . As a result, as shown in the graph 2203, the timing at which the parallax barrier for two-dimensional display is formed as barrier control is earlier than the normal timing. Thus, since the response speed for forming the barrier is increased, it is possible to suppress the generation of an inappropriate image when switching from the three-dimensional display to the two-dimensional display.

  Referring to FIG. 23, as shown in a graph 2301, when switching from a three-dimensional display to a two-dimensional display, a two-dimensional image is displayed little by little between the three-dimensional display and the two-dimensional display. Provide time to be. Specifically, as shown in the graph 2302, the duty ratio for controlling the operating voltage applied for forming the parallax barrier gradually decreases from 50% to 0%, for example. The reduction pattern is set in advance, for example, every 5% or every 10%, but other reduction patterns may be used. As a result, as shown in the graph 2303, the image displayed in three dimensions is gradually switched to a two-dimensional image. As a result, the user looking at the display 150 can change the image.

  Referring to FIG. 24, as shown in a graph 2401, when control (LCD control) for switching the display 150 from three-dimensional display (3D) to two-dimensional display (2D) is performed, the time required to form a parallax barrier Therefore, a transient state 2410 is formed. At this time, as shown in a graph 2402, as barrier control, the drive signal is given to the switching liquid crystal 410 in a manner of gradually decreasing. At this time, the display 150 displays an image 2420 as shown in the graph 2403. Since the transition state 2410 is a state in which the parallax barrier is not completely formed, the CPU 310 performs, for example, an all-black screen, a symbol, or other two-dimensional display as an image 2420 based on the data held in the RAM 346. In addition, a picture or a character that is visible in both of the three-dimensional display is displayed on the display 150. This data is read from the flash memory 344, ROM 348 or other non-volatile data recording medium, or obtained by the mobile phone 100 from the outside by a communication signal or other signals. As shown in the graph 2404, by displaying such a picture or character, the user can recognize the switching from the three-dimensional display to the two-dimensional display.

  FIG. 25 is a diagram illustrating a control mode when the orientation of the mobile phone 100 displaying an image in three dimensions is switched from the vertical direction to the horizontal direction.

  As shown in the graph 2501, when the control mode in the display 150 is switched from the three-dimensional vertical mode to the horizontal mode, control for displaying a two-dimensional image 2510 is executed between them. Is done.

  Specifically, as shown in a graph 2502, a parallax barrier for displaying a two-dimensional image is formed when switching from a three-dimensional vertical display to a horizontal display. At this time, a two-dimensional image is displayed as shown in a graph 2503. As a result, since the two-dimensional display is performed from the time when the position of the display 150 is no longer in the vertical direction, an inappropriate image is prevented from being generated for the three-dimensional display when switching the formation of the parallax barrier. Is done.

  Although the invention has been described and shown in detail, it is clearly understood that this is by way of example only and should not be taken as a limitation, the scope of the invention being construed by the appended claims Will.

  100 cellular phone, 110, 120 case, 130 biaxial hinge, 140 speaker, 150 display device, 160 button, 170 microphone, 304 tuner, 306,308 antenna, 316 GPS antenna, 320 camera, 382 memory card.

Claims (16)

An image display device capable of displaying a three-dimensional image,
A liquid crystal display device;
A backlight for supplying light to the liquid crystal display device;
A forming portion configured to form a parallax barrier;
When the display mode is switched between the two-dimensional display and the three-dimensional display, the luminance of the backlight is controlled according to the temporal change characteristic of the brightness of the liquid crystal display device due to the formation of the parallax barrier. And a controller for
When the controller switches from a two-dimensional display to a three-dimensional display, a signal value for controlling the driving of the forming unit is determined based on a rated signal value supplied when the three-dimensional display is performed. The image display device is configured to make the time required for the forming unit to form the parallax shorter than the time required when the rated signal value is given by overshooting.   The image display device according to claim 1, wherein the controller is configured to control luminance of the backlight based on a temporal change characteristic according to an inverse function of a function representing the temporal change characteristic.   The controller is configured to control the luminance of the backlight by increasing a current supplied to the backlight by a predetermined magnitude when switching from a two-dimensional display to a three-dimensional display. The image display device according to claim 1 or 2, wherein An image display device capable of displaying a three-dimensional image,
A liquid crystal display device;
A backlight for supplying light to the liquid crystal display device;
A forming portion configured to form a parallax barrier;
When the display mode is switched between the two-dimensional display and the three-dimensional display, the luminance of the backlight is controlled according to the temporal change characteristic of the brightness of the liquid crystal display device due to the formation of the parallax barrier. And a controller for
When the controller switches from the two-dimensional display to the three-dimensional display, the timing at which the signal value is given to the forming unit in order for the forming unit to form the parallax is advanced by a predetermined time. An image display device configured to display a two-dimensional image in a state where a barrier is formed. An image display device capable of displaying a three-dimensional image,
A liquid crystal display device;
A backlight for supplying light to the liquid crystal display device;
A forming portion configured to form a parallax barrier;
When the display mode is switched between the two-dimensional display and the three-dimensional display, the luminance of the backlight is controlled according to the temporal change characteristic of the brightness of the liquid crystal display device due to the formation of the parallax barrier. And a controller for
When the controller switches from a two-dimensional display to a three-dimensional display, a parallax barrier is formed by the forming unit by gradually increasing a duty ratio of a signal value given to the forming unit to form a parallax barrier. An image display device configured to control the display. A memory for storing image data for displaying the image prepared in advance;
The controller is configured to display the predetermined image on the liquid crystal display device based on data stored in the memory when switching from a two-dimensional display to a three-dimensional display. The image display device according to claim 1. A posture detecting unit configured to detect a vertical and horizontal posture of the image display device;
7. The controller according to claim 1, wherein the controller is configured to form an oblique parallax barrier in the forming unit when the posture of the image display device is switched between vertical and horizontal. 8. The image display device described. A sensor configured to detect a vertical and horizontal posture of the image display device;
The controller is configured to select a pixel from which data is output in order to display an image according to the rotation of the image display device when the posture of the image display device is switched between vertical and horizontal. The image display device according to any one of claims 1 to 6.   When the controller switches from the three-dimensional display to the two-dimensional display, the current supplied to the backlight is changed until the brightness of the liquid crystal panel changes after the formation of the parallax barrier by the forming unit is released. The image display device according to claim 1, wherein the image display device is configured to wait for adjustment. A display control device that is connected to a display device capable of displaying a three-dimensional image by forming a parallax barrier and controls display of an image by the display device, the display device comprising: a liquid crystal display device; A backlight for supplying light to the liquid crystal display device, and a forming part for forming a parallax barrier,
The display control device includes:
A communication circuit configured to communicate a control signal with the display device;
When the display mode is switched between the two-dimensional display and the three-dimensional display, the luminance of the backlight is controlled according to the temporal change characteristic of the brightness of the liquid crystal display device due to the formation of the parallax barrier. and a controller for,
When the controller switches from a two-dimensional display to a three-dimensional display, a signal value for controlling the driving of the forming unit is determined based on a rated signal value supplied when the three-dimensional display is performed. The display control device is configured so that the time required for the forming unit to form parallax is shorter than the time required when the rated signal value is given by overshooting . A display control device that is connected to a display device capable of displaying a three-dimensional image by forming a parallax barrier and controls display of an image by the display device, the display device comprising: a liquid crystal display device; A backlight for supplying light to the liquid crystal display device, and a forming part for forming a parallax barrier,
The display control device includes:
A communication circuit configured to communicate a control signal with the display device;
When the display mode is switched between the two-dimensional display and the three-dimensional display, the luminance of the backlight is controlled according to the temporal change characteristic of the brightness of the liquid crystal display device due to the formation of the parallax barrier. And a controller for
The controller, on the basis of the temporal change characteristics according inverse function of a function representing the temporal change characteristics, said have been configured to control the brightness of the backlight, Table示制control device.   The controller is configured to control the luminance of the backlight by increasing a current supplied to the backlight by a predetermined magnitude when switching from a two-dimensional display to a three-dimensional display. The display control apparatus according to claim 10 or 11, wherein A display control device that is connected to a display device capable of displaying a three-dimensional image by forming a parallax barrier and controls display of an image by the display device, the display device comprising: a liquid crystal display device; A backlight for supplying light to the liquid crystal display device, and a forming part for forming a parallax barrier,
The display control device includes:
A communication circuit configured to communicate a control signal with the display device;
When the display mode is switched between the two-dimensional display and the three-dimensional display, the luminance of the backlight is controlled according to the temporal change characteristic of the brightness of the liquid crystal display device due to the formation of the parallax barrier. And a controller for
When the controller switches from the two-dimensional display to the three-dimensional display, the timing at which the signal value is given to the forming unit in order for the forming unit to form the parallax is advanced by a predetermined time. barrier is configured to display a two-dimensional image in a state of being formed, Table示制control device. A display control device that is connected to a display device capable of displaying a three-dimensional image by forming a parallax barrier and controls display of an image by the display device, the display device comprising: a liquid crystal display device; A backlight for supplying light to the liquid crystal display device, and a forming part for forming a parallax barrier,
The display control device includes:
A communication circuit configured to communicate a control signal with the display device;
When the display mode is switched between the two-dimensional display and the three-dimensional display, the luminance of the backlight is controlled according to the temporal change characteristic of the brightness of the liquid crystal display device due to the formation of the parallax barrier. And a controller for
When the controller switches from a two-dimensional display to a three-dimensional display, a parallax barrier is formed by the forming unit by gradually increasing a duty ratio of a signal value given to the forming unit to form a parallax barrier. It is configured to control the table示制control device. A memory for storing image data for displaying the image prepared in advance;
The controller is configured to display the predetermined image on the liquid crystal display device based on data stored in the memory when switching from a two-dimensional display to a three-dimensional display. the display control device according to any one of claims 10 14. When the controller switches from the three-dimensional display to the two-dimensional display, the current supplied to the backlight is changed until the brightness of the liquid crystal panel changes after the formation of the parallax barrier by the forming unit is released. adjustment is configured to wait for a display control apparatus according to claim 10 15.

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