WO2012046686A1

WO2012046686A1 - Image display device capable of displaying three-dimensional image, and display control device for controlling display of image

Info

Publication number: WO2012046686A1
Application number: PCT/JP2011/072753
Authority: WO
Inventors: 高山　和也; 健次前田; 辰雄渡辺; 修萬羽; 浩司大塚
Original assignee: シャープ株式会社
Priority date: 2010-10-04
Filing date: 2011-10-03
Publication date: 2012-04-12
Also published as: JPWO2012046686A1; JP5529284B2

Abstract

The objective is to suppress flickering when switching between a two-dimensional image and a three-dimensional image. The CPU (310) of a portable telephone includes buffers (1710, 1720), a parallax determination unit (1730) that detects switching between a two-dimensional image and a three-dimensional image; and an image-processing unit (1740). When the display mode is switched between the two-dimensional display and the three-dimensional display, the image-processing unit (1740) controls the luminance of a backlight in response to the temporal change characteristic of the brightness of the display due to the formation of a parallax barrier.

Description

Image display apparatus capable of displaying a three-dimensional image, and display control device for controlling display of image

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

Devices capable of displaying three-dimensional images are known. For example, Japanese Patent Application Publication No. 2007-529960 (Patent Document 1) discloses a personal electronic device for 3D acquisition and display (see stage 0002). Japanese Patent Application Laid-Open No. 2010-050645 (Patent Document 2) discloses an image processing apparatus capable of reducing the visual burden generated when viewing an image including a large movement such that the entire screen moves (see [Abstract]. See [Issue].

Japanese Patent Application Publication No. 2007-529960 Unexamined-Japanese-Patent No. 2010-050645

In the case of a method using a parallax barrier to display a three-dimensional image, the brightness of the image displayed in three dimensions may be lower than the brightness of the image displayed in two dimensions. Moreover, when switching from three-dimensional display to two-dimensional display, the image may be disturbed. Therefore, there is a need for seamless switching between 2D and 3D displays. In another aspect, display control is needed to seamlessly switch between two-dimensional and three-dimensional display.

According to one embodiment, an image display device capable of displaying a three-dimensional image is provided. The image display apparatus 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 brightness of 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 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 brightness of the backlight by switching the current supplied to the backlight by a predetermined amount when switching from two-dimensional display to three-dimensional display. It is done.

Preferably, when switching from the two-dimensional display to the three-dimensional display, the controller supplies a signal value for controlling the drive of the forming unit when the three-dimensional display is performed. By overshooting more, the time for the forming unit to form the parallax is configured to be shorter than the time required when the rated signal value is given.

Preferably, when switching from two-dimensional display to three-dimensional display, the controller advances the timing at which the signal value is given to the forming unit to form the parallax by a predetermined time so as to form the parallax. The two-dimensional image is configured to be displayed with the barrier formed.

The controller controls 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 two-dimensional display to three-dimensional display. Is configured as.

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

Preferably, the image display device further includes a posture detection unit configured to detect the vertical and horizontal postures of the image display device. The controller is configured to form a diagonal parallax barrier in the forming portion when the posture of the image display device switches between vertical and horizontal.

Preferably, the image display device further comprises a sensor configured to detect the vertical and horizontal posture of the image display device. The controller is configured to select a pixel for which data is output to display an image in response to rotation of the image display device when the orientation of the image display device switches between vertical and horizontal.

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

According to another embodiment, a display control device is provided that is connected to a display capable of displaying a three-dimensional image by forming a parallax barrier to control display of the image by the display. 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 the 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 brightness of the backlight according to the temporal change characteristic of the brightness of the liquid crystal display device according to the above.

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

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

According to an image display device according to an aspect, switching between two-dimensional display and three-dimensional display is performed seamlessly. According to the display control apparatus according to the other 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 where cellular phone 100 was opened. It is a figure showing the state where cellular phone 100 was folded. FIG. 2 is a block diagram showing a hardware configuration of mobile phone 100. It is a figure for demonstrating the luminance change at the time of switching between a two-dimensional display and a three-dimensional display. It is a figure showing the composition of display 150 in the case where display 150 can display an image according to the posture in any of the portrait direction and landscape direction. It is a figure for demonstrating the unsuitable display of the image in, when switching from two-dimensional display to three-dimensional display. FIG. 6 is a diagram showing an operation characteristic of mobile phone 100. FIG. 16 is a diagram illustrating the operation characteristic of mobile phone 100 according to another aspect. It is a figure showing the operating characteristic of cellular phone 100 according to the other side. It is a figure showing the operating characteristic of cellular phone 100 according to the other side. It is a figure showing the operating characteristic of cellular phone 100 according to the other side. It is a figure showing the parallax barrier formed when rotating cellular phone 100 which is performing three-dimensional display about 90 degrees clockwise. FIG. 7 is a diagram showing an arrangement of pixels when the cellular phone 100 performing three-dimensional display is rotated approximately 90 degrees clockwise. It is a figure (the 1) for explaining change of the luminosity of display 150. It is a figure. FIG. 16 is a second diagram to explain a change in brightness of the display 150; It is a figure (the 1) for explaining other correspondence to brightness change. It is a figure (the 2) for explaining other correspondence to a brightness change. It is a figure showing the composition of CPU310 in detail. FIG. 16 is a diagram illustrating an image reproduction device 1900 and a three-dimensional display device 190. FIG. 17 is a diagram (part 1) illustrating control when the display mode of the image by the mobile phone 100 is switched from the three-dimensional display to the two-dimensional display. FIG. 17 is a diagram (part 1) illustrating control when switching from the three-dimensional display in the vertical direction to the three-dimensional display in the horizontal direction; FIG. 17 is a second diagram illustrating control when switching from three-dimensional display to two-dimensional display; FIG. 17 is a third diagram showing control when switching from three-dimensional display to two-dimensional display; FIG. 16 is a fourth diagram illustrating control when switching from three-dimensional display to two-dimensional display; FIG. 17 is a second diagram illustrating control when switching from the three-dimensional display in the vertical direction to the three-dimensional display in the horizontal direction;

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

In the present embodiment, mobile phone 100 is exemplified, but other mobile communication terminals such as PDAs, electronic dictionaries, and other information processing terminals can be used to at least three-dimensional display using a parallax barrier. The technical idea according to the present embodiment can be applied to any device having a display device. 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 an apparatus that does not include a display apparatus and that outputs an image, such as a hard disk recording and reproducing apparatus and a Blu-ray disc recording and reproducing apparatus. In this case, the technical idea is applied by a combination of the device and an external display device (for example, a television capable of three-dimensional display using a parallax barrier) connected to the device. In this case, when transmitting the video signal to the external display device, the device also transmits a signal for controlling formation of a parallax barrier of the external display device. In this case, the technical concept is specifically realized, for example, as an image display control circuit. Alternatively, in another aspect, a processor included in the device is realized as cooperation between hardware and software by executing a control program.

The 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 the mobile phone 100 is opened. FIG. 2 is a diagram showing the cellular phone 100 in a folded state.

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 with respect to the housing 120 in two axial directions. 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 longitudinal rotation axis. It is a hinge for rotating.

The mobile telephone 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 cellular phone 100 is in the open state (also referred to as a “first state”), the display 150 is moved by the biaxial hinge 130 in the same direction and direction as the side on which the plurality of buttons 160 are arranged. It is configured to face either.

The plurality of buttons 160 are configured as switches that receive 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 a software key.

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

In the present embodiment, mobile phone 100 is a foldable type, but in another aspect, it is a slide type configured such that one housing slides relative to the other housing, It is also good. In yet another aspect, a tablet type or straight type terminal device may be applied.

The hardware configuration of mobile phone 100 according to the present embodiment will be described with reference to FIG. FIG. 3 is a block diagram showing a hardware configuration of mobile phone 100. Referring to FIG. In addition to the configuration shown in FIG. 1, 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 reception front end. The 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 ( A light emitting diode 376, a memory card drive device 380, a data communication I / F (interface) 378, and a vibrator 384 are provided. A memory card 382 may be attached to the memory card drive 380.

The antenna 306 receives the one-segment broadcast wave. The tuner 304 selects a program in accordance with an instruction of 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 then the processed signal is sent to the CPU 310. CPU 310 executes processing for controlling the operation of mobile phone 100 based on an instruction given to mobile phone 100. The CPU 310 executes predetermined processing 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.

Microphone 170 receives an utterance to mobile phone 100, and sends a signal corresponding to the voice uttered to audio signal processing circuit 370. The voice signal processing circuit 370 executes predetermined processing for a call based on the signal, and sends out the processed signal to the CPU 310. The CPU 310 converts the signal into data for transmission, and sends the converted data to the communication device 302. The communication device 302 uses the data to generate a signal for transmission, and sends the signal to the antenna 308.

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

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

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

The audio signal processing circuit 370 performs 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 components, but in another aspect, even if the CPU 310 and the audio signal processing circuit 370 are integrally configured. Good.

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

The LED 376 implements 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 (the interval, the number of colors to be emitted, the blinking pattern, etc.) is not particularly limited.

The data communication I / F 378 receives the 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 transmits data received via the cable to the CPU 310.

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

The GPS antenna 316 receives a signal emitted 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 portable telephone 100 If the pattern matches, the signal is sent to the positioning processing unit 312.

The positioning processing unit 312 uses the signal to execute positioning processing, and calculates the position of the mobile phone 100 that has received the signal. The CPU 310 displays the calculation result on the display 150. In one aspect, the display 150 may superimpose and 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 captured by the camera 320 and position information of the place.

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

As shown in graph A, when control to switch the display 150 between two-dimensional display (2D) and three-dimensional display (3D) (LCD control) is performed, the backlight current (BL current) is usually , A certain level. In this case, assuming that the luminance (that is, the appearance) is 100% in the two-dimensional display, the luminance in the three-dimensional display is about 50%. This is because, as shown in the states B and C, the

parallax barriers

420, 421, 422, 423 in the switching liquid crystal 410 disposed in the upper portion (display output direction) of the liquid crystal display panel 400 included in the display 150. This is because it is formed at the time of dimensional display, and the amount of light emitted from the liquid crystal display panel 400 is reduced.

The change in luminance will be further described with reference to FIG. FIG. 5 is a diagram showing the configuration of display 150 in the case where display 150 can display an image according to the posture in either the vertical direction or the horizontal direction.

In FIG. 5, as shown in state A, when the display 150 is in the longitudinal direction,

parallax barriers

520, 521, 522, 523 are formed to constitute the

slits

510, 511, 512. As shown in state B of FIG. 5, when the display 150 is in the landscape direction,

parallax barriers

530, 531, 532, 533 are formed to constitute the

slits

540, 541, 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 cellular phone 100 is in the vertical direction is higher than the luminance when the cellular phone 100 is in the horizontal direction. Therefore, if the posture is changed in the lateral direction by rotating the cellular phone 100 displaying a three-dimensional image in the vertically long posture by about 90 degrees, the luminance is lowered.

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

When control (LCD control) to switch the display 150 between two-dimensional display (2D) and three-dimensional display (3D) is performed as shown in the graph 601, as shown in the graph 602, the parallax barrier is Barrier control to form is performed. In the barrier control, when a command instructing formation of a parallax barrier is given at time TA, as indicated by a solid line, a delay occurs because the formation of the parallax barrier actually takes time. The response speed of the parallax barrier is about 2 to 3 frames and is about 40 msec. As a result, as shown by the dotted line, it is formed at time TB. Therefore, as shown in the graph 603, the 3D image 610 in a state in which the parallax barrier is not completely formed is displayed between the time TA and the time TB. This can also 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.

The characteristics of the mobile phone 100 according to the present embodiment will be described with reference to FIG. FIG. 7 is a diagram showing the operation characteristic of mobile phone 100. Referring to FIG.

In one aspect, it is assumed 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 control (LCD control) to switch the display 150 between the two-dimensional display (2D) and the three-dimensional display (3D) is performed as shown in the graph 701, 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, the luminance in the half region is doubled, and the luminance on the display 150 is almost the same as the luminance before switching, so as shown in the graph 703, between the two-dimensional display and the three-dimensional display. Smooth switching is realized.

The characteristics of the mobile phone 100 in another aspect will be described with reference to FIG. FIG. 8 is a diagram representing the operation characteristic of mobile phone 100 in accordance with another aspect.

As shown in the graph 801, when control (LCD control) to switch 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, at time TA, an overshooted voltage value VMAX is provided. This is larger than the voltage value VC given in the steady state in which the three-dimensional display is stably realized. In this case, as shown in the graph 803, since the parallax barrier is formed at time TC, it becomes earlier than time TB at which the parallax barrier is formed when the voltage value VMAX is not given. As a result, the time for which an inappropriate image is formed is shortened.

With reference to FIG. 9, the mobile phone 100 in still another aspect will be described. FIG. 9 is a diagram showing operation characteristics of mobile phone 100 in accordance with still another aspect.

As shown in the graph 901, when control (LCD control) to switch the display 150 between two-dimensional display (2D) and three-dimensional display (3D) is performed, barrier control for forming a parallax barrier is As shown in graph 902, it starts at 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 time TA. Since the two-dimensional image 910 including the shutter has better visibility than the three-dimensional image not including the shutter, the impact on the user due to the image brought about when forming the parallax barrier may be mitigated.

With reference to FIG. 10, the mobile phone 100 in still another aspect will be described. FIG. 10 is a diagram showing operation characteristics of mobile phone 100 in accordance with yet another aspect.

As shown in the graph 1001, when control (LCD control) to switch 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 raised to, for example, 50% at time TB. At this time, as shown in area 1010, the suggested amount is gradually adjusted. As a result, as shown in the graph 1003, between the time TA and the time TB, the image 1020 in the transition period in which the two-dimensional image is switched to the three-dimensional image is displayed. 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.

The operation of the mobile phone 100 in still another aspect will be described with reference to FIG. FIG. 11 is a diagram showing operation characteristics of mobile phone 100 in accordance with still another aspect.

As shown in the graph 1011, when control (LCD control) to switch the display 150 between two-dimensional display (2D) and three-dimensional display (3D) is performed, transient is caused due to the time required to form the parallax barrier. A 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 mode of gradually rising from time TA to time TB. At this time, the display 150 displays the image 1120 as shown in the graph 1013. Since the transient state 1110 is a state in which the parallax barrier is not completely formed, the CPU 310 uses the data held in the RAM 346 as an image 1120, for example, an all black screen, a symbol or other two-dimensional display The display 150 displays pictures or characters visible in any of the three-dimensional display. This data is read from the flash memory 344, the ROM 348 or other non-volatile data storage medium, or is obtained from the outside by the mobile phone 100 according to a communication signal or other signal. By displaying such pictures and characters, the user can recognize switching between two-dimensional display and three-dimensional display.

Although the case has been described above in which the mobile phone 100 switches from two-dimensional display to three-dimensional display, such technical ideas may be applied also when switching from three-dimensional display to two-dimensional display. .

That is, in the case of FIG. 7, it may be 1⁄2 times the size of the backlight current in three-dimensional display, and in the case of FIG. 8, the undershooted voltage value may be given. The duty ratio may be lowered gradually. Specific control of these will be described in detail in FIGS.

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

When three-dimensional display is performed when the cellular 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. In this state, when cellular phone 100 according to this aspect is rotated clockwise,

parallax barriers

1210, 1220, 1230 and 1240 are rotated at the rotation angle, for example, at about 45 degrees as shown in state B. It is formed with a corresponding slope (ie about 45 degrees). Thereafter, when the cellular phone 100 is further rotated to be in the lateral direction, as shown in the state C, the

parallax barriers

1210, 1220, 1230, and 1240 are formed in the lateral direction. In this way, even if the display 150 displaying a three-dimensional image is rotated, the three-dimensional image is displayed even at a position during the rotation (state B). Therefore, even if the attitude of the mobile phone 100 is switched, a three-dimensional image is appropriately displayed.

Although FIG. 12 exemplifies a state in which approximately 45 degrees is rotated as the position in the middle of the rotation, the position in the middle of the rotation is not limited to this. The parallax barrier may be formed at more locations. For example, in still another aspect, in the case where the rotation angle is approximately 30 degrees and 60 degrees, the parallax barrier may be formed according to the angle when the rotation angle is approximately 30 degrees and 60 degrees.

Next, with reference to FIG. 13, the operation of the mobile phone 100 in still another aspect will be described. FIG. 13 is a diagram showing the arrangement of pixels when cellular phone 100 performing three-dimensional display is rotated approximately 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 area 1310, and the right eye The image for (R) is displayed in the area 1320. At this time, in both the image for the left eye and the image for the right eye, it is assumed that the RGB array 1350 is formed from the left direction to the right direction.

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

In this case, the area in which the area 1310 for the left eye is displayed is different in the states A, B, and C. In one aspect, such a change of the area is performed by the mobile phone 100 detecting its rotational position and in accordance with the rotational angle. For example, when the posture of mobile phone 100 changes from the position shown in state A to the position shown in state B, mobile phone 100 sets a plurality of areas (for example, areas 1330 and 1320) arranged on the left and right. Detect

When the cellular phone 100 is further rotated and located in the position shown in FIG. 13C, the same area is detected. Thereafter, when the cellular phone 100 is rotated about 90 degrees, the

areas

1330 and 1310 are detected as areas arranged in the left-right direction. In this case, since the pair of the

regions

1340 and 1320 is also arranged to be left and right, the

regions

1340 and 1320 may be detected. In this aspect, since the set of

areas

1330 and 1310 is above the set of

areas

1340 and 1320, CPU 310 displays an image for three-dimensional display in

areas

1330 and 1310.

Changes in the brightness of the display 150 will be described with reference to FIGS. 14 and 15. Graph A is a diagram illustrating the change in brightness of the display 150 when the parallax barrier is formed. When an instruction 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 performed steadily is maintained.

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

Therefore, using the characteristics shown in graphs A and B, as shown in graph C, the brightness increases from time T1 to T2, and then decreases from time T2 to time T3. Therefore, the increase and decrease in brightness may be recognized as "flicker".

Therefore, the response to such flicker in brightness will be described with reference to FIG. Graph A and Graph B correspond to Graph A and Graph B in FIG. 14, respectively. The graph C is a diagram showing the response to the change in brightness.

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

Note that an approximate function may be used as the function for giving the reciprocal.
Next, the change in brightness of the display 150 will be described with reference to FIGS. 16 and 17. Graph A of FIG. 16 is a diagram showing a change in brightness of the display 150 when the parallax barrier is formed. When an instruction to form a parallax barrier is given to switching liquid crystal 410 at time T1, the brightness decreases as the parallax barrier is formed. However, in the present embodiment, the brightness of display 150 continues even after the instruction. It shows the case where the timing at which the brightness is reduced is held after time T5, that is, when the reaction for forming the instruction and the parallax barrier is 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 performed steadily 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 then the brightness is kept constant from time T2 to time T5, The brightness decreases from time T5 to time T3. Therefore, the increase and decrease in brightness may be recognized as "flicker".

Therefore, the response to such flickering of brightness will be described with reference to FIG. Graph A and Graph B correspond to Graph A and Graph B in FIG. The graph C is a diagram showing the response to the change in brightness.

As shown in graph A, when the change in brightness upon switching from two-dimensional display to three-dimensional display is expressed as, for example, a function LD · g (t−T1) (where t represents time), graph C As shown, backlight control is performed according to a function LB · 1 / g (t−T1) which gives the inverse of the value of the function. That is, backlight control is performed with a backlight current value based on the function LB · 1 / g (t−T1) from time T1 to time T5. In this way, the change in brightness shown in graph A and the change in brightness shown in graph C are offset, and a constant brightness (LD · LB) is realized as shown in graph D. . In this case, time T5 = T6. Thereby, the flicker resulting from the change in brightness can be suppressed. From time T6 on, flicker can be suppressed by using the embodiments described in FIGS. 14 and 15.

If the change in brightness in switching from two-dimensional display to three-dimensional display can be approximated to a constant, the function giving the reciprocal may not be a function, and the reciprocal may be used.

Although the case has been described above in which the mobile phone 100 switches from two-dimensional display to three-dimensional display, such technical ideas may be applied also when switching from three-dimensional display to two-dimensional display. . That is, in FIG. 14 to FIG. 17, "flicker" is suppressed by performing control in the same manner as controlling the current value of the backlight so as to follow a function giving an inverse.

Referring to FIG. 18, CPU 310 for realizing mobile phone 100 according to the present embodiment will be described. FIG. 18 shows the configuration of CPU 310 in detail. The 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 disparity determination unit 1730, and the input of the image processing unit 1760. 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.

The input of the disparity 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. 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 of one pixel among the image data stored in the RAM 346. The parallax determination unit 1730 detects switching between two-dimensional display and 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 there is disparity.

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, for example, based on the output of the gyro sensor.

When the display mode is switched between the two-dimensional display and the three-dimensional display, the image processing unit 1740 performs backlighting 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 brightness of the backlight based on a temporal change characteristic according to an inverse function of a function indicating the temporal change characteristic.

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

In another aspect, when the image processing unit 1740 switches from two-dimensional display to three-dimensional display, signal values for controlling driving of the switching liquid crystal 410 are displayed three-dimensionally. By overshooting the supplied signal value, the time for the switching liquid crystal 410 to form a 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 two-dimensional display to three-dimensional display, the timing at which a signal value is given to the switching liquid crystal 410 in order for the switching liquid crystal 410 to form parallax is predetermined. By advancing by time, it is configured to display a two-dimensional image in a state in which the parallax barrier is formed.

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

In another aspect, the RAM 346 holds image data for displaying a previously prepared image. The image processing unit 1740 is configured to cause the liquid crystal display device to display a predetermined image based on the data stored in the RAM 346 when switching from two-dimensional display to three-dimensional display. The data held in the RAM 346 is stored in the flash memory 344 or another 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 another interface.

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

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

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

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

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

The image reproduction device 1900 according to the present modification includes the tuner 304, the CPU 310, the RAM 346, the ROM 348, the audio signal processing circuit 370, the memory card drive device 380, the infrared communication device 1902, the disk drive device 1920 and the HDD 1944. , A monitor 1950, an audio output 1940, an audio input 1970, and a data communication I / F 1978. The same reference numerals as in the configuration shown in FIG. 3 denote the same hardware. Therefore, their description will not be repeated.

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

The disk drive device 1920 receives the mounting of the optical disk 1922. The optical disc 1922 is a DVD, BD or other disc. The optical disc 1922 stores data for three-dimensional display, and is read by the disc 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 device 1900. The audio output 1940 is an interface for outputting audio to the outside of the image reproduction device 1900 (for example, a television, headphones, etc.).

The monitor 1950 is disposed on the front of the housing of the image reproduction device 1900, and displays the operating 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, a high-definition multimedia interface (HDMI), but other communication standards may be used. In one aspect, the data communication I / F 1978 sends a signal for controlling switching between 2D and 3D 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 device 1991 receives, from the data communication I / F 1978, a signal for controlling switching of display of an image by the liquid crystal display 1993 between two-dimensional display and three-dimensional display.

The CPU 1992 controls formation of a parallax barrier by the liquid crystal display 1993 based on a control signal sent from the data communication I / F 1991. The aspect of this control is as shown in the above-mentioned 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 the change in brightness is also suppressed.

The above embodiment will be further described with reference to FIGS. 20 to 25. FIGS. 20 to 25 are diagrams each showing control when switching from three-dimensional display to two-dimensional display.

Referring to FIG. 20, in one aspect, it is assumed 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) to switch the display 150 between three-dimensional display (3D) and two-dimensional display (2D) is performed (graph 2001), backlight current (BL in two-dimensional display after switching) The magnitude of the current) is about 50% of the magnitude of the backlight current in the three-dimensional display (graph 2002). As a result, the luminance in an area twice as large as the area before switching is approximately 50%, so that the luminance in the display 150 is approximately the same as the luminance before switching. As a result, seamless switching from three-dimensional display to two-dimensional display is realized (graph 2003). The numerical value of 50% is for illustration only. Therefore, the value of the output level of the backlight current (about 50% in the above case) may be further corrected according to the change of the operating characteristic or the luminance.

FIG. 21 is a diagram showing a state in which the cellular phone 100 displaying a three-dimensional image is rotated in the horizontal direction from the vertical direction. Here, it is assumed that the brightness in the case where the horizontally oriented mobile phone is displaying in three dimensions is about 95% of the brightness in the case where the horizontal direction is directed.

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

FIG. 22 is a diagram showing another control in the case of switching the display by the mobile phone 100 from the three-dimensional display to the two-dimensional display. As the display 150 changes from three dimensions to two dimensions (graph 2201), as shown in graph 2202, the operating voltage values provided to control the formation of the parallax barrier are changed. Specifically, when switching from three-dimensional display to two-dimensional display, a voltage value lower than the operating voltage value given in two-dimensional is given to switching liquid crystal 410, and a parallax barrier is formed. . As a result, as shown in the graph 2203, the timing at which the parallax barrier for two-dimensional display is formed as the barrier control becomes earlier than the normal timing. As described above, since the response speed for forming the barrier is increased, it is possible to suppress the generation of an inappropriate image at the time of switching from the three-dimensional display to the two-dimensional display.

Referring to FIG. 23, as shown in graph 2301, when switching from three-dimensional display to two-dimensional display, a two-dimensional image is displayed little by little between the three-dimensional display and the two-dimensional display. Provide time for Specifically, as shown in graph 2302, the duty ratio for controlling the operating voltage provided to form the parallax barrier gradually decreases, for example, from 50% to 0%. The pattern of decrease is preset, for example, every 5%, every 10%, but may be other decrease patterns. 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 be able to change the image.

Referring to FIG. 24, as shown by graph 2401, when control (LCD control) for switching 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 the graph 2402, as barrier control, the drive signal is given to the switching liquid crystal 410 in a gradually decreasing manner. At this time, as shown in graph 2403, display 150 displays image 2420. Since the transient state 2410 is a state in which the parallax barrier is not completely formed, the CPU 310 uses the data held in the RAM 346 as an image 2420, for example, an all black screen, a symbol or other two-dimensional display The display 150 displays pictures or characters visible in any of the three-dimensional display. This data is read from the flash memory 344, the ROM 348 or other non-volatile data storage medium, or is obtained from the outside by the mobile phone 100 according to a communication signal or other signal. As shown in the graph 2404, by displaying such a picture or character, the user can recognize switching from three-dimensional display to two-dimensional display.

FIG. 25 is a diagram showing 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 on the display 150 is switched from the 3D vertical mode to the horizontal mode, control for displaying a two-dimensional image 2510 is executed. Be done.

Specifically, as shown in the graph 2502, at the time of switching from three-dimensional vertical display to horizontal display, a parallax barrier for displaying a two-dimensional image is formed. At this time, a two-dimensional image is displayed as shown in the graph 2503. As a result, since the two-dimensional display is performed from the time when the position of the display 150 is not in the vertical direction, it is possible to prevent the generation of an inappropriate image for the three-dimensional display when switching the formation of the parallax barrier. Be done.

While the invention has been described and illustrated in detail, it is to be clearly understood that this is for the purpose of illustration only and is not to be taken as a limitation, and the scope of the invention is to be interpreted by the appended claims. Will.

100 mobile phones, 110, 120 housings, 130 two-axis hinges, 140 speakers, 150 displays, 160 buttons, 170 microphones, 304 tuners, 306, 308 antennas, 316 GPS antennas, 320 cameras, 382 memory cards.

Claims

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 formation configured to form a parallax barrier;
When the display mode is switched between the two-dimensional display and the three-dimensional display, the brightness of the backlight is controlled in accordance with the temporal change characteristic of the brightness of the liquid crystal display device due to the formation of the parallax barrier. An image display device comprising a controller for
The image display apparatus according to claim 1, wherein 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.
The controller is configured to control the brightness of the backlight by increasing the current supplied to the backlight by a predetermined amount when switching from two-dimensional display to three-dimensional display. The image display apparatus according to claim 1 or 2, wherein
When the controller switches from the two-dimensional display to the three-dimensional display, a signal value for controlling the drive of the forming unit is determined by a rated signal value supplied when the three-dimensional display is performed. The image according to claim 1, wherein the formation section makes the time for forming the parallax shorter than the time required when given a rated signal value by overshooting the image. Display device.
When switching from two-dimensional display to three-dimensional display, the controller advances the timing at which a signal value is given to the forming unit to form the parallax by a predetermined time so that the forming unit generates the parallax. The image display device according to claim 1, configured to display a two-dimensional image in a state in which the barrier is formed.
When the controller switches from two-dimensional display to three-dimensional display, the formation of the parallax barrier by the formation unit is performed by gradually increasing the duty ratio of the signal value given to the formation unit to form the parallax barrier. The image display device according to claim 1, wherein the image display device is configured to control
It further comprises a memory for storing image data for displaying a previously prepared image,
The controller is configured to cause the liquid crystal display device to display the predetermined image based on the data stored in the memory when switching from two-dimensional display to three-dimensional display. The image display apparatus according to any one of claims 1 to 6.
The image display apparatus further includes an attitude detection unit configured to detect an attitude of the image display device in the vertical and horizontal directions,
The controller according to any one of claims 1 to 7, wherein the controller is configured to form a diagonal parallax barrier in the formation portion when the posture of the image display device switches between vertical and horizontal. Image display device described.
Further comprising a sensor configured to detect the vertical and horizontal attitude of the image display device,
The controller is configured to select a pixel to which data is output to display an image in response to rotation of the image display device when the orientation of the image display device switches between vertical and horizontal. The image display apparatus according to any one of claims 1 to 7.
When the controller switches from three-dimensional display to two-dimensional display, after the formation of the parallax barrier by the forming unit is released, the controller supplies current to the backlight until the brightness of the liquid crystal panel changes. The image display device according to any one of claims 1 to 9, configured to wait for adjustment.
A display control device connected to a display device capable of displaying a three-dimensional image by forming a parallax barrier, for controlling display of an image by the display device, the display device including 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
A communication circuit configured to communicate control signals with the display device;
When the display mode is switched between the two-dimensional display and the three-dimensional display, the brightness of the backlight is controlled in accordance with 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 controlling the display.
The display control device according to claim 11, wherein 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.
The controller is configured to control the brightness of the backlight by increasing the current supplied to the backlight by a predetermined amount when switching from two-dimensional display to three-dimensional display. The display control device according to claim 11 or 12, wherein
When the controller switches from the two-dimensional display to the three-dimensional display, a signal value for controlling the drive of the forming unit is determined by a rated signal value supplied when the three-dimensional display is performed. The display according to claim 11, wherein the formation section makes the time for forming the parallax shorter than the time required when the rated signal value is given, by causing the overshoot as well. Control device.
When switching from two-dimensional display to three-dimensional display, the controller advances the timing at which a signal value is given to the forming unit to form the parallax by a predetermined time so that the forming unit generates the parallax. The display control device according to claim 11, configured to display a two-dimensional image in a state in which the barrier is formed.
When the controller switches from two-dimensional display to three-dimensional display, the formation of the parallax barrier by the formation unit is performed by gradually increasing the duty ratio of the signal value given to the formation unit to form the parallax barrier. The display control device according to claim 11, wherein the display control device is configured to control
It further comprises a memory for storing image data for displaying a previously prepared image,
The controller is configured to cause the liquid crystal display device to display the predetermined image based on the data stored in the memory when switching from two-dimensional display to three-dimensional display. The display control device according to any one of claims 11 to 16.
When the controller switches from three-dimensional display to two-dimensional display, after the formation of the parallax barrier by the forming unit is released, the controller supplies current to the backlight until the brightness of the liquid crystal panel changes. The display control device according to any one of claims 11 to 17, configured to wait for adjustment.