JP2011107392A - Display system and method for controlling the display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of displaying a projection image and transmitting light on the outside to the inside. <P>SOLUTION: The display system (12, 14) includes: a controller that generates a control signal; a first optical interception device (230, 212) that performs passage and interception of a projected image in a time division manner according to the control signal (CTL) from the controller; a screen device (350) that is arranged on a window side, and performs display of the image passing through the first optical interception device and transmission of the light on the outside in a time division manner in synchronization with transmission and interception by the first optical interception device according to the control signal from the controller; and a second optical interception device (330) that is arranged on a mirror side, and performs interception and transmission of the light from the screen device in a time division manner in synchronization with display and transmission by the screen device according to the control signal from the controller. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display device, and more particularly to a display system capable of displaying projected images and transmitting outside light in a time division manner.

  Using a display device near the rear window (rear window) separately from the normal display of the car, a message that expresses gratitude to the other car that interrupted your car while driving the car It is contemplated to display and display a message that emphasizes that the following car is being braked.

  A known line-of-sight image display apparatus includes a projection unit that projects an image and a display screen unit that forms an image of projection light from the projection unit. The image display device controls the light transmission state by an imaging unit set at a position facing an observer who observes the display image while holding the display screen unit, and an electric signal applied to the display screen unit. The control means and the control means alternately switch between the light transmitting state and the light non-transmitting state of the display screen means, start the photographing means in the light transmitting state, and when the display screen means is in the light transmitting state Means for interrupting the image projection of the projection means. When the ambient light intensity on the observer side that varies periodically is detected and the ambient light intensity reaches a predetermined value, an image is input by the photographing means.

  In a known display and imaging apparatus, a projector is disposed obliquely behind the back surface of the screen so that the video camera can be disposed perpendicularly to the back surface of the screen, thereby eliminating the obstruction of the optical path of the projected video and captured image caused by the mutual arrangement. At this time, the trapezoidal distortion of the projected image obliquely behind the screen is reversely corrected in advance by the inverted trapezoidal distortion correction circuit so that a correct image is displayed. As a result, the projection and shooting optical axes are matched on the screen surface so that the lines of sight of the interlocutors are matched, and light from the projector light source or the like is prevented from directly entering the front interlocutor by projecting from an oblique direction. . In addition, a mask is provided between the projector and the screen to shield the light during the photographing period and prevent reflection of the light source and the like, thereby obtaining a clean photographed image. As a result, a display space is realized in which the lines of sight of the interlocutors are matched and the user can enjoy the feeling of interacting at the same place.

  In the known three-dimensional display method, a plurality of display surfaces with different depth positions are arranged for each of the left eye and right eye of the observer, and a two-dimensional image is displayed on each of the plurality of display surfaces to obtain a third order. The original stereoscopic image is displayed. The display method is based on a parallax image obtained by viewing the display target object from the left and right eyes of the observer, and a two-dimensional image displayed on each display surface for the left and right eyes of the observer. A plurality of two-dimensional images for the left eye and the right eye that are overlapped when viewed from the left eye and the right eye are generated, and the two-dimensional images displayed on the display surfaces for the left eye and the right eye of the observer are displayed. The brightness is changed independently for each display surface, and a two-dimensional image for the left eye and right eye is displayed on each display surface for the left eye and right eye of the observer. Thereby, it is possible to suppress contradiction between physiological factors of stereoscopic vision, and it is possible to electrically rewrite and display a moving image.

  In a known stereoscopic image display device, corresponding left-eye images and right-eye images are displayed alternately in succession, for example, by using a polarizing filter, the transmission of light from the left-eye image to the viewer's right eye and the right-eye Quench the transmission of light from the image to the left eye of the observer, and alternately and synchronously with the alternate image display, the non-quenched light rays from the left eye image leaking into the observer's right eye and the left eye of the observer A three-dimensional image is displayed by scattering non-quenched light rays from the leaked right eye image. Scattering is performed by using a liquid crystal scattering shutter that is electrically triggered in synchronization with the display of the image. The shutter disperses the unquenched light rays that leak into the device, so that no image information is perceived and the light rays simply appear as a slight increase in background illumination.

Japanese Patent No. 3011439 (Japanese Patent Laid-Open No. 4-096581) JP-A-6-133111 JP 2000-333211 A Japanese Patent No. 3411281 JP-A-8-094663 (Japanese Patent No. 3020426) JP 2001-039212 A JP-A-5-113742 Japanese Patent Laid-Open No. 3-121942 (Japanese Patent No. 2817264)

  When a normal display device is arranged near the rear window of an automobile, the visual field behind the driver is narrowed by the display device. In addition, if a transparent hologram element is placed on the rear window of an automobile, the rear field of view can be secured. However, a part of the display message can be seen by the driver due to a shift in the wavelength or incident angle of the reproduction light, and the rear visibility is reduced. There are things to do. For example, such a decrease in visibility becomes remarkable when the outside is dark at night.

  By controlling the screen to become opaque in a time-sharing manner in synchronism with the image projected from the inside, and to make the screen transparent so that the outside light is transmitted to the inside during the remaining time, the inventor It was recognized that the projected image can be displayed on the screen while ensuring the visibility behind the driver.

  An object of the present invention is to realize a display system capable of displaying a projected image and transmitting outside light.

  According to one aspect (feature) of an embodiment of the present invention, a display system time-divisionally controls a control unit that generates a control signal and passes and blocks a projected image according to the control signal from the control unit. And the first optical blocking device disposed on the window side and synchronized with the passage and blocking of the first optical blocking device according to a control signal from the control unit. A screen device that performs time-division display of the image that has passed through the device and transmission of outside light, and is arranged on the mirror side, and is synchronized with the display and transmission of the screen device according to a control signal from the control unit And a second optical blocking device that performs blocking and transmission of light from the screen device in a time-sharing manner.

  According to one aspect of the embodiment of the present invention, it is possible to realize a display system capable of displaying an inner projected image and transmitting outer light inward.

FIG. 1A shows an example of a schematic configuration of a message display system according to an embodiment of the present invention. FIG. 1B shows an example of a schematic configuration of a message display system according to another embodiment of the present invention. FIG. 2 shows an example of a schematic block diagram of the message display system of FIGS. 1A and 1B. 3A to 3C show examples of waveforms of pulse signals generated by the video / external light switching control device of FIG. 2 when the illuminance detected by the illuminance sensor is intermediate. 4A to 4C show examples of pulse signals generated by the video / external light switching control device of FIG. 2 when the illuminance detected by the illuminance sensor is large (the outside is bright). 5A to 5C show examples of waveforms of pulse signals generated by the video / external light switching control device of FIG. 2 when the illuminance detected by the illuminance sensor is small (the outside is dark). . FIG. 6 shows an example of a flowchart of control for message display executed by the information processing device.

The objects and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims.
The foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to limit the invention.

  Non-limiting embodiments of the present invention will be described with reference to the drawings. In the drawings, similar components and elements are provided with the same reference numerals.

  FIG. 1A shows an example of a schematic configuration of a message display system 12 according to an embodiment of the present invention.

  FIG. 1B is a variation of FIG. 1A and shows an example of a schematic configuration of the message display system 14 according to another embodiment of the present invention.

  FIG. 2 shows an example of a schematic block diagram of the message display system 12 or 14 of FIGS. 1A and 1B.

  1A and 2, a message display system 12 particularly suitable for an automobile 2 includes an illuminance sensor 120 for detecting external illuminance, a shutter device 330 such as a liquid crystal shutter device, and a liquid crystal transmission rear screen device. A screen device 350, a projector 210, and a shutter device 230 such as a liquid crystal shutter device. The projector 210 may include, for example, a liquid crystal panel for display and a lens (not shown). The shutter device 230 is disposed in front of the exit of the projector 210. The screen device 350 is disposed inside the rear window 30 of the automobile 2. The shutter device 330 is disposed on the front side (reflection surface side) of the room mirror 40. The liquid crystal shutter device and the liquid crystal transmission type rear screen device take two states, an optical scattering state and a transmission state, according to the applied voltage. The liquid crystal shutter device and the liquid crystal transmissive rear screen device may use, for example, a Japanese plate glass um film (light control glass) that takes a transmissive state and a non-transmissive state according to whether a voltage is applied or not. The liquid crystal shutter device may be, for example, a high-speed liquid crystal shutter device.

  The message display system 12 further includes an information processing device 200 for selecting a display message, and an image / external light switching control device 300 for switching between projection of an inner image and transmission to the inner side of the outside light or scenery. Is included. Elements 210, 230, 330, 350, 200 and 300 receive supply power from a power source (not shown). The information processing device 200 may be a personal computer or a car navigation system.

  The information processing device 200 supplies display information to the projector 210 in accordance with a user or driver operation OP. Further, according to the operation, the information processing device 200 supplies the control signal CTL to the video / external light switching control device 300 according to the intensity of the illumination sensor 120. Furthermore, the information processing device 200 supplies a control signal CTL to the elements 210, 230, 350, and 330 according to the operation.

  The video / external light switching control device 300 corresponds to driving the shutter device 230, the shutter device 330, and the screen device 350 in accordance with the on / off control signal and the duty ratio as the control signal CTL from the information processing device 200. Pulse signals PS_A, PS_B, and PS_C having a duty ratio are generated.

  In response to the pulse signal PS_A, the shutter device 230 transmits and blocks the projection video from the projector 210 in a time division manner. The screen device 350 responds to the pulse signal PS_C in a time-division manner to project the projected image that has become clouded so as to scatter light and has passed through the shutter device 230 from the projector 210, and is made transparent from the outside of the automobile 2. Transmits light into the room. In response to the pulse signal PS_B, the shutter device 330 transmits, in a time-division manner, the outside light or the reflection of the scenery by the room mirror 40 that has passed through the rear window 30 and the screen device 350 to the room mirror 40. The screen apparatus 350 is blocked from entering the image.

  The information processing device 200 may receive the status signal ST and generate control signals CTL for the projector 210 or the DLP projector 212 and for the video / external light switching control device 300 accordingly. The information processing device 200 includes an input device 110 including operation keys and a display device 112. The state signal ST indicates an operation state of the automobile 2, for example, an engine key insertion / removal, an engine start / stop, an acceleration / deceleration of the automobile 2, a brake operation, a steering operation, a direction indicator operation, and the like. It is a signal to represent. Projector 210 or DLP projector 212 projects an image representing a display message onto screen device 350 in accordance with display information from information processing device 200. The video / external light switching control device 300 outputs the pulse signals PS_A, PS_B, and PS_C for driving the DMD of the projector 210 or the DLP projector 212, the shutter device 330, and the screen device 350 according to the control signal CTL from the information processing device 200. It may be generated.

  In FIG. 2, the information processing device 200 includes a control unit 100, an input device 110, a display device 112, a memory 202, and a message generation unit 204. The memory 202 includes a program storage area, a data storage area, and a display information storage area. The control unit 100 may be a processor or a microcomputer. The control function of the control unit 100 may be implemented in the form of an integrated circuit as hardware, or may be implemented in the form of a program stored in the memory 202. In this case, the control unit 100 operates according to a program stored in the memory 202.

  The control unit 100 stores the input information related to the display message input or selected by the user via the input device 110 in the message storage area of the memory 202 and supplies it to the message generation unit 204. The control unit 100 may supply message selection information to the message generation unit 204 as the control signal CTL according to the input information. Alternatively and / or additionally, the control unit 100 may supply message selection information to the message generation unit 204 as the control signal CTL according to the state signal ST. Under the control of the control unit 100, the message generation unit 204 stores input information in a message storage area of the memory 202, extracts a display message from the message storage area of the memory 202, and supplies the display message to the projector 210. The message generator 204 generates a video signal representing the designated or selected message. For example, the message generation unit 204 generates a video signal representing a message such as “Thank you”, “Rapid braking”, “Congestion”, “Right turn”, or “Please leave a distance between vehicles”, which is designated or selected. . Projector 210 generates and displays an image represented by the image signal on an internal liquid crystal panel, and projects it toward screen device 350.

  The video / external light switching control device 300 includes oscillators (OSC) 302, 322 and 342, duty ratio adjusters or pulse width modulators (PWM) 304, 324 and 344, and amplifiers (AMP) 306, 326 and 346. It is out.

  The oscillators 302, 322, and 342 are started or stopped according to an on / off control signal as a control signal CTL from the control unit 100 of the information processing device 200, and are periodically pulsed signals such as 50 Hz, 60 Hz, or 70 Hz, for example. Is supplied to duty ratio adjusters 304, 324 and 344. Duty ratio adjusters 304, 324, and 344 adjust the duty ratio of the pulse signals of oscillators 302, 322, and 342 in accordance with a signal that represents the duty ratio as control signal CTL from control unit 100 of information processing device 200, A pulse signal having an adjusted duty ratio is generated and supplied to amplifiers 306, 326 and 346. The amplifiers 306, 326, and 346 amplify the pulse signals from the duty ratio adjusters 304, 324, and 344 and supply the driving pulse signals PS_A, PS_B, and PS_C to the shutter device 230, the shutter device 330, and the screen device 350, respectively. . The pulse signal PS_C may be the one obtained by amplifying the pulse signal from the duty ratio adjuster 324 by the amplifier 326 or the same as the pulse signal PS_B.

  Referring to FIGS. 1B and 2, the message display system 14 includes a DLP (Digital Light Processing) projector 212 instead of the projector 210 and the shutter device 230 of FIG. 1A in addition to the elements 120, 200, 300, 330 and 350. It is out. The DLP projector 212 includes a light source, a dichroic filter, a DMD (Digital Micromirror Device) for reflecting and diverting light from the light source toward the screen device 350 in units of pixels, and a plurality of lenses. .

  In this case, the information processing device 200 supplies display information and a control signal CTL to the DLP projector 212. In response to the pulse signal PS_A, the DLP projector 212 generates and projects an image or stops generating the image.

  The information processing device 200 may receive the state signal ST of the automobile 2 and generate the control signal CTL for the DLP projector 212 in response thereto. The DLP projector 212 projects an image representing the display message on the screen device 350 in accordance with the display message from the information processing device 200. The video / external light switching control device 300 generates a pulse signal PS_A for driving the DMD of the DLP projector 212 in accordance with the control signal CTL from the information processing device 200 and supplies the pulse signal PS_A to the DLP projector 212.

  3A to 3C show the waveforms of the pulse signals PS_A, PS_C, and PS_B generated by the video / external light switching control device 300 in FIG. 2 when the illuminance detected by the illuminance sensor 120 is an intermediate magnitude. An example is shown.

  4A to 4C show the pulse signals PS_A, PS_C, and PS_B generated by the video / external light switching control device 300 in FIG. 2 when the illuminance detected by the illuminance sensor 120 is large (the outside is bright). An example of a waveform is shown.

  5A to 5C show pulse signals PS_A, PS_C, and PS_B generated by the video / external light switching control device 300 in FIG. 2 when the illuminance detected by the illuminance sensor 120 is small (the outside is dark). An example of a waveform is shown.

  When pulse signal PS_A is high level H in FIGS. 3A, 4A and 5A, pulse signal PS_C is low level L in FIGS. 3B, 4B and 5B, and pulse signal PS_B is low level L in FIGS. 3C, 4C and 5C. . When pulse signal PS_A is low level L in FIGS. 3A, 4A and 5A, pulse signal PS_C is high level H in FIGS. 3B, 4B and 5B, and pulse signal PS_B is high level H in FIGS. 3C, 4C and 5C. .

  3A, 4A, and 5A, when the pulse signal PS_A is at the high level H, the shutter device 230 or the DLP projector 212 (DMD) is in an open state or a passing state and projects an image on the screen device 350. 3B, 4B, and 5B, when the pulse signal PS_C is at a low level L, the screen device 350 displays a projected image in a closed state or an optical scattering state. 3C, 4C, and 5C, when the pulse signal PS_B is at the low level L, the shutter device 330 is in a closed state to block the image on the screen device 350 from entering the room mirror 40. Thereby, glare caused by message display is prevented.

  3A, 4A, and 5A, when the pulse signal PS_A is at the low level L, the shutter device 230 or the DLP projector 212 is in a closed state or a cut-off state and cuts off image projection. 3B, 4B, and 5B, when the pulse signal PS_C is at the high level H, the screen device 350 is in an open state or an optically transmissive state and transmits light or scenery from the outside. 3C, 4C, and 5C, when the pulse signal PS_B is at the high level H, the shutter device 330 is in an open state or a transmissive state, and the light or landscape incident on the room mirror 40 and the room transmitted through the screen device 350 are displayed. -The reflection by the mirror 40 is transmitted.

  As shown in FIGS. 3A to 3C, when the magnitude of the illuminance detected by the illuminance sensor 120 is intermediate, the duty ratios or pulse widths of the pulse signals PS_A, PS_C, and PS_B each indicate an intermediate state. Accordingly, the message display and transmission by the screen device 350 are performed at an equal time ratio in a time division manner.

  As shown in FIGS. 4A to 4C, when the illuminance detected by the illuminance sensor 120 is large, the duty ratio or pulse width of the pulse signal PS_A is large, and the duty ratio or pulse width of PS_C and PS_B is small. . Thereby, message display and transmission by the screen device 350 are performed at a rate that the display time is longer than the transmission time. Thereby, when the outside scenery is bright, the projected image on the screen device 350 can be displayed brighter.

  As shown in FIGS. 5A to 5C, when the illuminance detected by the illuminance sensor 120 is small, the duty ratio or pulse width of the pulse signal PS_A is small, and the duty ratio or pulse width of PS_C and PS_B is large. . Thereby, message display and transmission by the screen device 350 are performed at a rate that the display time is shorter than the transmission time. Thereby, when the outside scenery is dark, the outside scenery which is incident through the screen device 350 and reflected on the room mirror 40 can be brightened.

  FIG. 6 shows an example of a flowchart of control for message display executed by the information processing device 200.

  Referring to FIG. 6, in step 502, the control unit 100 of the information processing device 200 refers to the input state of the input information OP and the state signal ST to determine whether the message display state is on. If it is determined that the message display state is the on state, the procedure proceeds to step 504. If it is determined that the message display state is not the on state, that is, the off state, the procedure proceeds to step 526.

  In step 504, the control unit 100 selects a message to be displayed from the message storage area of the memory 202 according to the input information OP by the user or according to the state signal ST of the automobile 2. One or more messages may be stored in the message storage area of the memory 202 by the user.

  In step 506, the control unit 100 acquires a signal representing the magnitude of illuminance from the illuminance sensor 120. In step 508, the control unit 100 determines the duty ratio of the pulse signals PS_A, PS_B, and PS_C according to the intensity of illuminance.

  In step 510, control unit 100 activates projector 210 or DLP projector 212 and video / external light switching control device 300. In step 511, the control unit 100 supplies a control signal CTL representing the duty ratio to the video / external light switching control device 300. The video / external light switching control device 300 supplies pulse signals PS_A, PS_B, and PS_C whose pulse widths are adjusted according to the duty ratio.

  In step 512, the control unit 100 refers to the input state of the input information OP and the state signal ST to determine whether the message display is in an off state. If it is determined that the message display is in the off state, the procedure proceeds to step 524. Steps 511 (pulse generation) to 512 are repeated until it is determined that the message display is in the off state.

  In step 524, control unit 100 stops projector 210 or DLP projector 212 and video / external light switching control device 300 to stop the generation of the projected video and pulse signals PS_A, PS_B, and PS_C.

  In step 526, control unit 100 determines whether driving of automobile 2 has been completed or the engine key has been turned off based on state signal ST. If it is determined that the driving of the automobile 2 has ended, the procedure exits the routine of FIG. If it is determined that the driving of the automobile 2 has not ended, the procedure returns to step 502 in FIG.

  All examples and conditional expressions given here are intended to help the reader understand the inventions and concepts that have contributed to the promotion of technology, such examples and It should be interpreted without being limited to the conditions. Also, the organization of such examples in the specification is not related to showing the superiority or inferiority of the present invention. Although embodiments of the present invention have been described in detail, it should be understood that various changes, substitutions and variations can be made thereto without departing from the spirit and scope of the present invention.

12, 14 Message display system 30 Rear window 40 Room mirror 120 Illuminance sensor 200 Information processing device 100 Control unit 110 Input device 112 Display device 202 Memory 204 Message generation unit 210 Projector 212 DLP projector 230 Shutter device 300 Video / external light switching Control device 330 Shutter device 350 Screen device

Claims (6)

A control unit for generating a control signal;
According to a control signal from the control unit, a first optical blocking device that performs time-division passing and blocking of the projected image;
In accordance with a control signal from the control unit, the display of the image that has passed through the first optical blocking device and the outside of the first optical blocking device is synchronized with the passing and blocking of the first optical blocking device according to a control signal from the control unit A screen device that performs light transmission in a time-sharing manner;
A second optical unit arranged on the mirror side and performing time-division blocking and transmission of light from the screen device in synchronization with the display and transmission of the screen device in accordance with a control signal from the control unit A shut-off device;
Including display system.   2. The display according to claim 1, further comprising a video projection device disposed after the first optical blocking device or including the first optical blocking device and projecting the video toward the screen device. system. In a period in which the image is displayed on the screen device, the first optical blocking device passes the image, and the second optical blocking device blocks light from the screen device,
The first optical blocking device blocks the image and the second optical blocking device transmits light from the screen device during a period in which the screen device transmits light. The display system according to 1 or 2. The display system further includes an illuminance detector,
The control unit generates a control signal according to the illuminance magnitude detected by the illuminance detector,
The light blocking period from the screen device by the second optical blocking device is lengthened in accordance with a control signal from the control unit as the magnitude of the illuminance increases. 4. The display system according to any one of 3.   The display system according to claim 1, wherein the screen device takes a scattering state in which light is scattered for the display and a transmission state in which light is transmitted in accordance with an applied voltage. . A method for controlling a display system including a control unit, a first optical blocking device, a screen device disposed on a window side, and a second optical blocking device disposed on a mirror side,
Causing the first optical blocking device to perform the passage and blocking of the projected image in a time-sharing manner;
In synchronism with the passage and blocking of the first optical blocking device, the screen device displays the image that has passed through the first optical blocking device and the transmission of outside light in a time-sharing manner. A process to be performed;
Synchronizing the display and transmission of the screen device with the second optical blocking device to block and transmit light from the screen device in a time-sharing manner;
Including methods.

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