JP2011059438A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control the pixel arrangement of a display means 12 and a shutter means 15 matching a use state, and to save power by controlling a light quantity, in a display device wherein different images are visible from different directions on a common display screen. <P>SOLUTION: The display device includes a display means 12 having a pixel for one-direction to view from one direction, and a pixel for the other-direction to view from the other direction, a shutter means 15 for making the pixel for one-direction visible from one direction via a transparent part and the pixel for the other-direction visible from the other direction via the transparent part, and a backlight 18 for controlling the light quantity. A single mode for viewing the same screen from two directions, and a dual mode for viewing different screens are selected. A mode is switched to an eco-single mode for reducing the light quantity, and a normal single mode for setting the light quantity higher than that in the eco-single mode, and switched to an eco-dual mode for reducing the light quantity, and a normal dual mode for setting the light quantity higher than that in the eco-dual mode. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display device in which at least two users located adjacent to each other can view different images from a single display means. In particular, the present invention relates to an in-vehicle display device in which a driver and a passenger in a passenger seat can see different images from a single display means in a vehicle.

  Conventionally, a display device disclosed in Patent Document 1 is known. FIG. 15 shows the structure of this patent document. This realizes parallax angle control without reducing the definition of the display image by displaying the screen on the left and right two screens.

  Specifically, a display LCD 12 serving as a display unit and a parallax angle control LCD 15 constituting a parallax barrier (shutter) for viewing angle control arranged on the display LCD 12 are provided. The display LCD 12 has a display area and a light shielding area for each pixel. The light shielding area is an opaque part.

  The parallax angle control LCD 15 includes a transmission state switching unit that can switch between a transmission state and a non-transmission state in units of areas corresponding to each pixel of the display LCD 12. In the example of FIG. 15, the transmissive state switching unit of the parallax angle control LCD 15 is a part that makes the left third, which is a part of the area corresponding to one pixel of the display LCD 12, opaque.

  The images displayed in the entire display area of the display LCD 12 are driven according to the positional relationship between the area of the parallax angle control LCD 15 that has been made transparent by the transmission state switching unit, the display area of the display LCD 12, and the light shielding area. It is configured to be able to switch between a both-viewing state that is visible from both the seat and passenger seat directions and a one-viewing state that is visible only in one of the driver seat and passenger seat directions.

  Further, when an image is displayed on the display LCD 12 and it is detected that a predetermined state change such as a vehicle stop has occurred, the images displayed in the entire display area of the display LCD 12 are displayed in the directions of the driver seat and the passenger seat. The control unit that controls the transmission state of the transmission state switching unit so as to switch between the both viewing state that can be viewed from both and the one viewing state in which the image can be viewed only in either the driver seat or the passenger seat direction. It has.

  In the one viewing state, the control unit further switches the state in which only the direction of the driver's seat is visible and the state in which only the direction of the passenger seat is visible in a time multiplexed manner (time division) with respect to the transmission state switching portion. In addition, two types of images are switched and displayed on the display LCD 12 in synchronization with the time-multiplexed switching timing.

  The viewing angle control LCD 15 has a black matrix. That is, it has a black matrix on the shutter side.

  Thereby, the following screen configuration is possible. In the first example, during driving, the driver's seat can see a half-screen map screen, and the passenger seat can see both the half-screen maintenance operation screen or both the half-screen operation screen and half-screen map screen. In addition, the map can be viewed in full screen when the vehicle is stopped. From the back seat in the middle, you can see both the half-screen operation screen and the half-screen map screen.

  In the second example, when driving, the driver's seat can see a full-screen map screen, and the passenger seat can see the full-screen operation screen in a time multiplexed manner. When the vehicle is stopped, both the driver's seat and passenger's seat can see the map screen in full screen. Also, only the mixed screen can be seen from the back seat in the middle due to the influence of time multiplexing.

  In the third example, the driver's seat can see a half-screen map screen, and the passenger seat can see a half-screen operation screen or both a half-screen operation screen and a half-screen map screen. Also, from the back seat in the middle, you can see both the half-screen operation screen and the half-screen map screen. It should be noted that there is no description regarding the amount of light, the brightness, the luminance, etc. of the backlight.

  Next, a display device disclosed in Patent Document 2 is known. As shown in FIGS. 16A and 16B, an output pattern including a driver display output and a passenger side display output is created on the same screen. In the first display state shown in FIG. 16A, the driver seat side image signal D, the passenger seat side image signal P, and the pixel images (S1, S2,...) On the screen constituting the display means 12 are displayed. Are alternately output (alternate output pattern).

  On the other hand, each pixel row (V1, V2,...) Constituting the liquid crystal shutter 15 is a light shielding pattern that is displayed separately on the driver's seat side and the passenger's seat side corresponding to the alternate output pattern. The driver side image signal D is blocked from being displayed on the right side (passenger seat) and visible from the left side (driver's seat), while the passenger seat side image signal P is blocked from being displayed on the left side (driver's seat). The drive is controlled to a shading pattern that can be seen from the passenger seat.

  Then, in the second display state shown in FIG. 16B following the first display state, each pixel column of the display means 12 in which the driver seat side image signal D was output in the first display state is displayed. The driver seat side image signal P is output, and the driver seat side image signal D is output to each pixel row from which the passenger seat side image signal P was output.

  Then, the first display state shown in FIG. 16A and the second display state shown in FIG. 16B are repeated (for example, the number of output frames per unit time is set to be twice or more that of the conventional case). The image in the first display state and the image in the second display state are temporally overlapped, and the afterimage effect does not reduce the resolution (that is, the number of effective pixels). The driver can visually recognize the content of the display output for the driver, and the passenger on the passenger side can visually recognize the content of the display output for the passenger seat.

  As described above, the output pattern including the display content for the driver's seat direction and the display content for the passenger seat direction is switched and output in a time-sharing manner, and the switching timing of the output pattern and the directivity by the liquid crystal shutter 15 (for separate display). This is linked with the switching timing of the shading pattern.

  Therefore, even if the display content for the driver's seat direction and the display content for the passenger seat direction are simultaneously output on the screen in an alternate output pattern, the output pattern switching timing and the directivity switching timing by the liquid crystal shutter 15 Interlock.

  That is, by synchronizing, the display content for the driver's seat direction and the display content for the passenger seat direction can be temporally mixed to obtain an image that does not reduce the resolution. At this time, by utilizing the afterimage phenomenon of the eyes, it is possible to obtain a display device that performs different display outputs in a plurality of directions without reducing the resolution.

  In addition, the following is described as a description regarding the light quantity, brightness, luminance, and the like of the backlight. A device that uses a vehicle light switch, a light sensor, or the like is described as brightness detection means. The control unit performs control to change the setting of the output image and sound based on information detected by the brightness detection unit and the occupant detection unit.

  The luminance correction unit performs a process of correcting the luminance of the display content created by the driver seat side display processing unit and the passenger seat side display control unit. By performing the correction processing of the luminance correction unit, the display output can have sufficient luminance when displayed in a time-division manner by performing correction to increase the luminance as the visible time ratio of the display is smaller.

  For example, when the host vehicle is running from the outputs of the vehicle speed sensor, the speed change mechanism state detection unit, and the brake state detection unit, the ratio between the driver seat side display state and the passenger seat side display state is 1: 2. In addition, it is desirable to increase the density of the passenger side display state. This is because the driver does not stare at the display means while the vehicle is traveling, that is, during driving, while the passenger in the passenger seat can consider DVD reproduction output and the like.

  When the guidance output to the driver is executed from the navigation device, it is necessary to immediately and surely transmit information to the driver, so that the density of the driver seat side display state is increased. It is described that when the switching density between the driver seat side display state and the passenger seat side display state is changed, it is desirable to change the correction amount by the luminance correction unit in accordance with the switching density.

  That is, correction is performed to increase the luminance as the switching density is smaller (the visible time ratio is smaller). Note that the correction for increasing the brightness can be realized by a process for increasing the brightness of the backlight or an image process (a process such as adding an offset to the brightness value of each pixel of the image).

JP 2007-219486 A JP 2006-301573 A

  According to the techniques of Patent Documents 1 and 2, although the brightness can be changed, there is no description that performs the light amount control of the backlight in order to positively set the eco mode. The PDPD pixel array is a simple alternating output pattern, and the requirements for the screen on the driver side and the passenger seat side, various pixel arrays, and the concept of dynamically changing the backlight light quantity are described. It has not been.

  In addition, the concept of boundary pixels that make the screen clear and clear is not described. Furthermore, it is not sufficient to improve the visibility of the screen when it is bright due to external light such as sunlight.

  The present invention has been made paying attention to such problems existing in the prior art, and its purpose is dual mode in which different images can be viewed from different directions on a common display screen, and A display device capable of switching in a single mode, which is intended to realize pixel arrangement of a display unit and control of a shutter unit that match a user's use situation and further power saving by controlling the amount of light. To do.

  Descriptions of patent documents listed as prior art can be introduced or incorporated by reference as explanations of technical elements described in this specification.

  In order to achieve the above object, the present invention employs the following technical means. That is, in the first aspect of the invention, in order to see at least different images from two adjacent one and other two directions, a large number of one-pixels for viewing from one side and a large number of other pixels for viewing from the other are used. Display means having pixels, arranged on the side surface of the display means, having a large number of opaque portions and a large number of transparent portions, one pixel is viewed from the other through the transparent portion, and the other pixel is through the transparent portion A shutter means that can be viewed from the other side, a pixel for one side of the display means, a light quantity control means for controlling the light quantity from the other pixel, and a control means for controlling the display means, the shutter means and the light quantity control means, The control means is a means for selecting a single mode for viewing the same screen from one and the other two directions and a dual mode for viewing different screens. The amount of light is reduced when the single mode is selected. A method to switch between the eco single mode and the normal single mode that increases the light intensity over the eco single mode, and the eco dual mode that reduces the light intensity when the dual mode is selected and the normal dual mode that increases the light intensity over the eco dual mode. It is characterized by comprising means for switching to

  According to the present invention, since the eco mode is set in each of the single mode and the dual mode, the amount of light can be reduced and power saving can be achieved.

  The invention according to claim 2 is characterized in that the light amount control means is a backlight using a light emitting element for irradiating light to the display means and the shutter means.

  According to the present invention, the amount of light can be easily adjusted by controlling the input power to the backlight.

  According to the third aspect of the present invention, in the single mode, the shutter unit is fully opened and the images viewed from two directions are the same image, and the light amount control unit controls the light amount to be smaller than the light amount in the dual mode. It is characterized by being.

  According to the present invention, it is possible to save power in the single mode than in the dual mode.

  In the invention according to claim 4, the light amount in the normal single mode is substantially half the light amount in the normal dual mode, and the light amount in the eco single mode is substantially less than half of the light amount in the normal dual mode. It is characterized by that.

  According to the present invention, it is possible to reliably achieve power saving by making the light quantity substantially half or less than half.

  In the invention according to claim 5, in the eco dual mode, the number of pixels of the other pixel is made larger than the number of pixels of the one pixel for the driver of the vehicle on which the display means is mounted. It is characterized by reducing the amount of light compared to the dual mode.

  According to the present invention, when the image is not seen from one direction side, the number of pixels for the other side is increased more than the number of pixels for the one side to reduce the amount of light. Power saving can be achieved without substantially reducing the image quality.

  According to the sixth aspect of the present invention, in the eco-dual mode, when the one pixel is D and the other pixel is P, the arrangement of the pixels in the display means is alternated as DDPDPPDPP and P with respect to D The ratio of the number of pixels is substantially doubled, the pixel arrangement in the display means in the normal dual mode is completely alternated as in DPDPDPDPD, and the number of P pixels in the eco dual mode is normally P pixels in the dual mode. The light quantity in the eco dual mode is smaller than the light quantity in the normal dual mode.

  According to the present invention, when the driver does not see the image much, the number of pixels for the other side can be made larger than the number of pixels for the one side, and the amount of light can be reduced accordingly. Therefore, power saving can be achieved without substantially reducing the quality of the image when viewed from the above.

  According to the seventh aspect of the invention, when the eco dual mode is switched to the normal dual mode, not only the position of the opaque portion and the transparent portion of the shutter means is shifted, but also the width pattern of the opaque portion and the transparent portion is changed. It is characterized by.

  According to the present invention, in the eco dual mode, even when the number of pixels for one side is set to be larger than the number of pixels for the other side, the positions of the opaque portion and the transparent portion of the shutter means are shifted, and the opaque portion Since the width pattern of the transparent portion is changed, different images can be reliably seen from one direction and the other direction.

  The invention according to claim 8 is characterized by having boundary pixel insertion means for inserting a boundary pixel between the one-use pixel and the other-use pixel.

  According to the present invention, it is possible to prevent interference between adjacent pixels, for example, the colors of the one-use pixel and the other-use pixel are mixed.

  According to the ninth aspect of the present invention, in the single mode, there is provided means for switching to the self-shadow mode in which an opaque portion is formed in the shutter unit and the amount of light is increased as compared with the eco single mode together with the insertion of the boundary pixel. It is characterized by.

  According to the present invention, the self-shadow mode makes it easy to view an image when the surroundings of the display means are dazzling due to sunlight or the like.

  In the invention according to claim 10, in the eco dual mode when the boundary pixel is inserted, the ratio of the number of pixels of the other pixel P and the number of pixels of the one pixel D is set to 3: 1, and the boundary pixel is inserted. The amount of light in the eco-dual mode is smaller than the amount of light in the normal dual mode when the boundary pixel is inserted.

  According to the present invention, it is possible to reduce the amount of light corresponding to the number of pixels while inserting a boundary pixel in the eco dual mode to obtain a clear and easy-to-view image.

  The invention according to claim 11 is characterized in that the switching from the eco single mode to the normal single mode and the switching from the eco dual mode to the normal dual mode are performed by automatically detecting when the image on the display means is watched. It is said.

  According to the present invention, since the mode is automatically switched from the eco mode to the normal mode, troublesome operations are unnecessary, and images that are difficult to see can be reduced.

  In the invention of claim 12, in order to automatically detect when the image of the display means is watched, navigation device operation information from the navigation device body of the vehicle equipped with the display means, or vehicle travel information from the navigation device body. It is characterized by determining.

  According to the present invention, since appropriate automatic detection can be performed using the navigation device operation information of the navigation device main body or the vehicle travel information, switching from the eco single mode to the normal single mode, and from the eco dual mode to the normal dual Switching to the mode can be performed automatically and accurately.

  In the invention described in claim 13, the navigation device operation information or the vehicle travel information from the navigation device body is information that the driver of the vehicle operated the navigation device body, and the navigation device body is at a tolerance point or a branch point. It is characterized in that it is either information that detects that the vehicle has entered, or information that the navigation device body inserts notification information for the driver in the map information.

  According to the present invention, it is possible to automatically detect when the image on the display means is accurately watched based on the information from the main body of the navigation device, and the screen can be accurately switched from the eco mode to the normal mode that is easier to view. , Can contribute to safe driving.

1 is a schematic configuration diagram illustrating a schematic configuration of an in-vehicle display device according to a first embodiment of the present invention. It is the fragmentary sectional view which showed typically the structure of LCD for screen display which comprises the display means implement | achieved by the liquid crystal panel in the said embodiment, and LCD for parallax barrier which comprises a liquid-crystal shutter. It is a circuit diagram which shows schematic structure of the TFT substrate in FIG. It is a flowchart of the process which selects the single mode and dual mode in the said embodiment. It is a flowchart which shows the more specific process which performs eco single mode and normal single mode at the time of the single mode in the said embodiment. It is a flowchart which shows the more specific process which performs eco dual mode and normal dual mode in the dual mode in the said embodiment. FIG. 4 is a schematic configuration diagram illustrating an arrangement of driver pixels and front passenger side pixels, a liquid crystal shutter, and a backlight state in the eco dual mode in the embodiment. FIG. 4 is a schematic configuration diagram illustrating an arrangement of driver pixels and passenger side pixels, a liquid crystal shutter, and a backlight state in the normal dual mode in the embodiment. It is the block diagram which took out and showed the structure for boundary pixel insertion from the outline | summary structure of the vehicle-mounted display apparatus of FIG. 1 in the said embodiment. It is a flowchart which shows the action | operation of the block diagram of FIG. 9 in the said embodiment. It is a schematic block diagram which shows the pixel arrangement | sequence, liquid-crystal shutter, and the state of a backlight when a boundary pixel is inserted in the said single mode in the said embodiment. In the single mode in the above embodiment, a schematic configuration diagram showing a pixel arrangement, a liquid crystal shutter, and a backlight state when a boundary pixel is inserted with a part of shutter means turned on when the surrounding is high in luminance. is there. FIG. 4 is a schematic configuration diagram illustrating an arrangement of driver pixels and passenger side pixels, a liquid crystal shutter, and a backlight state when boundary pixels are inserted in the eco dual mode in the embodiment. FIG. 4 is a schematic configuration diagram illustrating an arrangement of driver pixels and passenger side pixels, a liquid crystal shutter, and a backlight state when boundary pixels are inserted in the normal dual mode in the embodiment. It is a schematic block diagram which shows the condition of the image described in well-known patent document 1, and the state of a display means and a shutter means. It is a schematic block diagram which shows the time division switching state of the display means and shutter means described in the well-known patent document 2.

(First embodiment)
Hereinafter, the in-vehicle display device according to the first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a schematic configuration diagram showing a schematic configuration of the vehicle-mounted display device of the present invention. In brief, in the first embodiment, the parallax barrier is adjusted by changing the width of the light-shielding pattern according to the number and position of passengers using a liquid crystal shutter as shutter means that can control the light-shielding pattern width. Thus, an easy-to-see image is provided to each passenger.

  For this purpose, in particular, it has the following configuration. Depending on the surrounding brightness, when you are in an environment where you want to increase the contrast or when the user wants to see an image that is not affected by adjacent images, a boundary pixel is formed, and the liquid crystal shutter is The image is controlled according to the pixel and is easy to view.

  In the dual mode, the image display signal for the driver and the image display signal for the passenger seat side are output for each pixel, and depending on when the driver looks at the screen and when in the eco mode where the screen is not watched, Adjust the number of pixels.

  Hereinafter, a description will be given based on the drawings. In FIG. 1, the in-vehicle display device 1 includes a main control unit 2 and a display processing unit 3 that form control means. The main control unit 2 receives the map image information 4 from the navigation device body 30. In addition, a TV signal 5 from the television is input. Also, a DVD signal 6 from a DVD (Digital Versatile Disc) device is input.

  Vehicle speed information 7 and user operation information 8 from the vehicle speed sensor are input. The user operation information 8 is information that has received an operation input from an occupant using a switch, a touch panel, or the like. The occupant detection information 9 is information that detects the presence or absence of the occupant sitting in the driver's seat and the passenger seat. Further, brightness detection information 10 representing the brightness of the vehicle interior and the glare of sunlight is input.

  The navigation device body 30 is a unit for setting and guiding the travel route of the host vehicle. Specifically, the current position of the host vehicle is acquired by GPS (Global Positioning System), the road on which the host vehicle is traveling is specified using map data, and the route is displayed using the display unit 12 or a speaker (not shown). Perform guidance.

  The main control unit 2 is a control unit that controls the in-vehicle display device 1 as a whole, receives input of user operation information 8 and the like, and via the driver display processing unit 3a and the passenger seat side display processing unit 3b, Output to the display means 12 and the speaker or the like.

  The display means 12 is a device that performs display output for the passenger, and the display content is created by the driver display processing unit 3a and the passenger seat side display processing unit 3b. The liquid crystal shutter 15 constituting the shutter means forms a parallax barrier that serves as a directivity control means for controlling the directivity of the display output by the display means 12.

  FIG. 2 is a partial horizontal sectional view schematically showing a configuration of a screen display LCD forming the display means 12 realized by a display composed of a liquid crystal panel and a parallax barrier LCD forming the liquid crystal shutter 15. The display means 12 includes a substrate module 12a and 12b composed of a polarizing plate 12a and a TFT substrate 12b, and a counter electrode side substrate module 12d, 12e and 12f composed of a color filter substrate 12d, a glass substrate 12e, and a polarizing plate 12f. In addition, the liquid crystal layer 12c is enclosed.

  A backlight 18 is disposed on the back side of the substrate modules 12a and 12b. The backlight 18 can change the amount of light. The counter electrode side substrate modules 12d, 12e, and 12f include a glass substrate 12e, a color filter substrate 12d disposed on the back side of the glass substrate 12e, and a polarizing plate 12f disposed on the front side of the glass substrate 12e. It is comprised including.

  The liquid crystal shutter 15 is disposed on the front side of the display unit 12, the TFT substrate 15 a disposed on the polarizing plate 12 f of the display unit 12, the polarizing plate 15 d disposed on the foremost side, and the back side thereof And a liquid crystal layer 15b sealed between the TFT substrate 15a and the glass substrate 15c.

  1 has a driver input / output control unit 2a and a passenger seat side input / output control unit 2b. The driver input / output control unit 2a is a control unit that receives an operation input constituting the user operation information 8 from the driver and controls an output to the driver. The passenger seat side input / output control unit 2b is a control unit that receives an operation input of the user operation information 8 from a passenger sitting on the passenger seat side and controls an output to the passenger seat side passenger.

  Here, the display output to the driver by the driver input / output control unit 2a and the display output to the passenger on the passenger side by the passenger seat side input / output control unit 2b can be simultaneously displayed by the single display means 12. It is. The occupant detection information 9 detects the presence or absence of an occupant, and includes, for example, a seat switch that includes a pressure sensor that is turned on when seated.

  FIG. 3 is a circuit diagram showing a schematic configuration of the TFT substrates 12b and 15a in FIG. The TFT substrates 12b and 15a in FIG. 2 include a scanning line driving circuit 23, a data line driving circuit 24, scanning lines LSN1, LSN2, LSN3,... Connected to the scanning line driving circuit 23, and a data line driving circuit 24. Are formed as a unit by a region surrounded by the data lines LD1, LD2, LD3, LD4..., The scanning lines LSN1, LSN2, LSN3,... And the data lines LD1, LD2, LD3, LD4. A plurality of subpixels 26 are included. In each subpixel 26, a pixel electrode 27 for applying a voltage to the liquid crystal layers 12c and 15b in FIG. 2 and a TFT element 28 for controlling the switching are formed.

  A display panel driving unit 20 is connected to the scanning line driving circuit 23 and the data line driving circuit 24, and the display panel driving unit 20 controls driving timing of the scanning line driving circuit 23 and the data line driving circuit 24. The scanning line driving circuit 23 performs a selection operation of the TFT elements 28, and the data line driving circuit 24 is configured to control the voltage applied to the pixel electrode 27. Each sub-pixel 26 in FIG. 3 operates by supplying pixel data for the passenger seat to the data lines LD1 and LD3, and pixel data for the driver's seat to the data lines LD2 and LD4, for example.

  In addition, in the single mode, the in-vehicle display device 1 of FIG. 1 has the same content on the display screen of the display unit 12 when the display content for the driver and the display content for the passenger seat include common content. Since the corresponding portion of the liquid crystal shutter 15 is always fully opened, different display is performed in a plurality of directions without reducing the resolution.

  The driver display processing unit 3a in FIG. 1 is a processing unit that creates display content for the driver. The passenger seat side display processing unit 3b is a processing unit that creates display contents for passenger side passengers seated in the passenger seat. The display processing unit 3 in FIG. 1 further includes a boundary pixel insertion unit 3c, an image resolution conversion circuit 3d, a backlight control unit 3e, a liquid crystal shutter control unit 3f, and a luminance correction unit 3g. The liquid crystal shutter control unit 3 f controls the operation of the liquid crystal shutter 15.

  The luminance correction unit 3g performs a process of correcting the luminance of the display content created by the driver display processing unit 3a and the passenger seat side display processing unit 3b. By performing the correction processing of the luminance correction unit 3g, the display image for the driver and the passenger seat side has sufficient luminance by performing correction to increase the luminance of the backlight 18 as the visible area ratio of the display is smaller. Can do.

  Next, a description will be given based on a flowchart. FIG. 4 is a flowchart of processing for selecting a single mode and a dual mode according to the first embodiment. When the control starts, it is detected in step S401 whether there is a change in the occupant. This detects the presence or absence of a change in the passenger in the passenger seat based on a signal from a pressure sensor or an infrared sensor of the seat. If there is no change in the occupant state, the process proceeds to step S402 and the current state is maintained.

  If there is a change in the occupant state, the process proceeds to step S403. In this step S403, if the passenger is seated in the passenger seat or the user operation information 8 (FIG. 1) is input and the user setting is made so as to view the video on the passenger seat side, it becomes YES, and after passing through step S404, The dual mode in step S405 is selected, and a parallax barrier is formed by the liquid crystal shutter 15 (FIG. 1) so as to match this. Details of step S405 will be described later. Also, the video signals set for the left and right are output to the display means 12 (FIG. 1). Next, the backlight 18 (FIG. 1) is controlled.

  The black image processing in step S404 is to turn off the backlight 18 for a moment and change the light shielding pattern of the liquid crystal shutter 15 (FIG. 1) during this time. By this black image processing, an unsightly image at the time of screen switching can be cut. In other words, the backlight 18 (FIGS. 1 and 2) is turned off for a moment so as not to show the mixed image.

  In step S403, if no passenger is seated in the passenger seat and the user operation information 8 (FIG. 1) is not input so as to view the video on the passenger seat side, the determination is NO, and the black image processing in step S406 is performed. In S407, the single mode is selected, the liquid crystal shutter 15 (FIG. 1) is fully opened, and the same video signal is output to the display means 12 (FIG. 1).

  In this single mode, since the number of pixels increases, a finer image is obtained than in the dual mode. Next, the backlight 18 (FIG. 1) is controlled, and the light emitting diode of the backlight 18 is turned on so that the backlight 18 is turned on with a light amount of 0.5, which is half when the light amount in the dual mode is 1. The amount of current (input power) supplied to is adjusted.

  In summary, in the single mode, the shutter means including the liquid crystal shutter 15 is fully opened, and the images viewed from the two directions are the same image, and the luminance correction shown in FIG. 1 is reduced to a light amount smaller than that in the dual mode. Control is performed by the light amount control means comprising the portion 3g. Thereby, in the single mode, it is possible to save power compared to the dual mode, and the life of the light emitting diode serving as the light emitting element of the backlight 18 is extended.

  The light amount in the normal single mode is substantially half the light amount in the normal dual mode, and the light amount in the eco single mode is substantially less than half the light amount in the normal dual mode. Thereby, power saving can be achieved reliably. Further, steps S403, 405, and 407 are provided as means for selecting a single mode in which the same screen is viewed from one and the other two directions and a dual mode in which different screens are viewed.

  Next, the single mode is effective when the user wants to use the screen widely for safe driving. If the passenger is seated in the passenger seat and the mode is set to single mode by the driver's operation, the passenger's seat will be given some kind of urgent notice, and only DVD and TV audio will be played. If processing is added as appropriate, the passenger on the passenger seat side does not feel uncomfortable.

  When displaying a digital high-definition broadcast (number of pixels 1920 × 1080 or 1440 × 1080) or the like, the image resolution conversion circuit 3d in FIG. 1 converts the image resolution (thinning out or reducing the pixels) so that the user can easily see it. )I do.

  The eco mode, which will be described later, is a mode that further suppresses the luminance of the backlight 18 except when it is assumed that the driver sees the map image in detail. When the driver gazes at a map or the like, the brightness of the backlight 18 is automatically corrected, and the screen is switched to the screen in the normal mode that is most easily seen by the user. Note that the display mode can be manually switched by a user operation (for example, an operation by a navigation operation button or the like installed on the steering wheel portion).

  Further, when a clear and easy-to-view image is requested, boundary pixels described later are inserted into the display means 12. Furthermore, even if the surroundings have high brightness (for example, sunlight is dazzling), by turning on some of the liquid crystal shutter portions, it is possible to provide an image that is easily visible to the user due to the boundary pixel plus liquid crystal shutter effect. Hereinafter, this will be described as a self-shadow mode.

  When a driver watches a map or the like, specifically, when he / she sees traffic jam information on a map image, there is a road guidance while driving near an intersection or near a branch point. In such a case, the display screen is automatically changed. The display can be manually changed by a user operation. On the other hand, an example of a case where the driver determines not to watch the map or the like is when the vehicle speed information 7 in FIG. 1 indicates a high-speed traveling state.

  FIG. 5 is a flowchart showing specific processing in the single mode in step S407 of FIG. When the control is started, it is determined in step S501 whether or not the user has set the eco mode. When the eco mode is not selected, the display in the normal single mode is performed in step S502, and the light amount of the backlight 18 (FIG. 1) at this time is half when the light amount in the normal dual mode to be described later is 1. The amount of light is adjusted to 0.5.

  If the eco mode is set in step S501, the backlight 18 is dimmed in step S503. At this time, the backlight 18 is turned on with a light amount of less than 0.5 when the light amount in the normal dual mode is 1.

  Next, in step S504, it is determined whether or not the driver who is the user is in a situation of gazing at the map image. This determination is based on the information from the navigation device body 30 when the vehicle travels near a tolerance point or a branch point at a predetermined vehicle speed or less, and when an operation for checking traffic jam information is performed, the user operates in the gaze mode. If YES, YES is displayed, and display in the normal single mode is performed in step S505. At this time, the amount of light of the backlight is adjusted to half the amount of light when the amount of light in the normal dual mode is 1.

  In step S504, if the host vehicle is not traveling near a tolerance point or a branch point, no operation for checking traffic jam information or the like is performed, and the user is not operating to enter the gaze mode, NO Thus, the process returns to step S503.

  Note that the arrangement of the driver pixel D and the passenger side pixel P and the state of the liquid crystal shutter in the single mode in steps S502 and S505 and in the eco single mode in step S503 are well known and will not be described.

  That is, at this time, the liquid crystal shutter is fully opened, and the common pixel (D or P) of the driver pixel D and the passenger seat side pixel P is a normal image. When the normal single mode is shifted to the eco single mode, the mode is switched simply by reducing the current value of the light emitting diode of the backlight 18.

  That is, in the eco single mode, the backlight light amount is set to be less than half that in the dual mode and darkened. This is optimal when there is only a driver in the passenger compartment, and the driver is driving and does not often see the image on the display means 12 (FIG. 1).

  In summary, when the single mode is selected, the above-described steps S503, 504, and 505 exist as means for switching between the eco single mode for reducing the amount of light and the normal single mode for increasing the amount of light over the eco single mode.

  The switching from the eco single mode to the normal single mode is performed by automatically detecting when the image on the display unit 12 is watched. According to this, since the mode is automatically switched from the eco mode to the normal mode, troublesome operations are unnecessary, and images that are difficult to see can be reduced.

  In order to automatically detect when the image on the display unit 12 is watched, the navigation device operation information 31 from the navigation device body 30 of the vehicle equipped with the display unit 12 or the vehicle travel information 32 from the navigation device body 30 is used. judge.

  Specifically, the vehicle travel information 32 from the navigation device body 30 detects when the host vehicle travels near a tolerance point or branch point at a predetermined vehicle speed or less. In addition, it detects from the navigation device operation information 31 that the driver's operation for checking traffic jam information and the like has been performed. Further, it is detected from the navigation device operation information 31 that the driver has manually operated the gaze mode on the navigation operation screen. According to this, since appropriate automatic detection can be performed, switching from the eco single mode to the normal single mode and switching from the eco dual mode to the normal dual mode can be performed automatically and accurately.

  Note that the navigation device body 30 may detect that the notice display information for the driver is inserted into the map image information 4 of FIG. 1 and automatically detect when the image is watched. That is, a function for outputting a signal to gaze at an image may be provided in the navigation apparatus body 30 and utilized.

  Next, the dual mode in step S405 of FIG. 4 will be described. First, an outline will be described. For example, except when it is assumed that the driver will look at the map in detail, the number of pixels displayed on the liquid crystal is controlled so that the passenger-side occupant prioritizes the pixel arrangement so that the passenger-side occupant can easily see the image. provide. At that time, the backlight 18 is controlled to reduce power consumption.

  When the driver watches the map, the brightness of the backlight 18 is automatically changed to make the screen most visible to the user. The display screen can be manually changed by a user operation (for example, a navigation operation button). Further, when changing the display form from the eco dual mode to the normal dual mode, the backlight 18 is turned off, and black image processing is performed to make a black image for a moment, thereby preventing a crosstalk screen (mixed screen) display.

  Furthermore, it is possible to switch to the boundary pixel insertion dual mode by inserting boundary pixels into the display image manually or automatically. By inserting boundary pixels, parallax barrier control can be facilitated, and interference between the pixels for the driver and the passenger seat can be reduced.

  In the dual mode, the liquid crystal shutter 15 (FIG. 1) is used as a parallax barrier for video display. In the dual mode, the liquid crystal shutter 15 is controlled to form a parallax barrier, and the screen is displayed in two directions. At that time, the light amount of the backlight 18 is also controlled.

  Basically, first, the distribution of the number of pixels of the display means 12 (FIG. 1) is determined from the priority of the driver and the passenger seat. When the user wants to see an environment where the contrast is to be increased (ambient brightness) or an image that is not affected by the adjacent image, a boundary pixel is formed, and the liquid crystal shutter 15 is controlled according to the pixel and the boundary pixel. Provide easy-to-read images.

  Hereinafter, the operation in the dual mode will be specifically described. FIG. 6 is a flowchart showing specific processing in the dual mode in step S405 of FIG. When the control is started, it is determined in step S601 whether or not the user has set the eco mode. When the eco mode is not selected, display in the normal dual mode is performed in step S602, and the light amount of the backlight at this time is set to 100% (ratio 1) of the light amount in the preset dual mode.

  If the eco mode is set in step S601, the backlight 18 is dimmed in step S603. At this time, the amount of current supplied to the light emitting diode of the backlight 18 is 0.67 when the ratio of the light amount in the normal dual mode is 1, that is, the backlight 18 is turned on with a light amount of 2/3. Adjusted.

  Next, in step S604, it is determined whether or not the driver who is the user is in a situation of gazing at the map image or the like. This determination is based on information from the navigation device body 30 when the host vehicle travels near a tolerance point or a branch point at a predetermined vehicle speed or less, when an operation for checking traffic jam information or the like is performed, and when the user enters the gaze mode. When operated, the answer is YES, and after the black image processing in step S605, display in the normal dual mode is performed in step S606. The light amount of the backlight at this time is the same as that in the normal dual mode in step S602, and is adjusted to the ratio of light amount 1 (100%). If NO in step S604, the process returns to step S603.

  In summary, when the dual mode is selected, the above-described steps S603, 604, and 606 exist as means for switching between the eco dual mode for reducing the amount of light and the normal dual mode for increasing the amount of light over the eco single mode. As a result, the eco mode is set even in the dual mode, so that the amount of light can be reduced and power saving can be achieved.

  When shifting from the eco dual mode to the normal dual mode, not only the current value of the light emitting diode of the backlight 18 is increased but also the driver pixel D and the passenger side pixel in the eco dual mode of FIG. From the arrangement of P (driver pixel D number 3 and passenger seat side pixel number P 6) and the state of the liquid crystal shutter 15, the driver pixel D and the passenger seat side pixel P in the normal dual mode of FIG. (The number of driver pixels D 5 and the number P of passenger side pixels P 4) and the state of the liquid crystal shutter 15 are switched.

  That is, in the eco dual mode of FIG. 7, the driver pixels D and the passenger side pixels P are arranged as in DDPDPPDPPDPPDPP. Further, the opaque portion (black portion in FIG. 7) 151 and the transparent portion 152 of the liquid crystal shutter 15 have a long portion and a short portion repeated.

  In the normal dual mode of FIG. 8, the arrangement of the driver pixel D and the passenger side pixel P is completely alternated as DPDPDPDPDPDPDP. Further, the opaque portion (black portion in FIG. 8) 151 and the transparent portion 152 of the liquid crystal shutter 15 are repeated with a uniform width.

  Accordingly, the eco dual mode (driver pixel D = 3 and the passenger side pixel P = 6) shown in FIG. 7 and the normal dual mode (driver pixel D = 5 and the passenger side pixel P shown in FIG. 8) are used. = 4), the number of pixels seen by the driver and the number of pixels seen by the passenger side are reversed.

  Accordingly, when the eco dual mode is switched to the normal dual mode, the driver can see a brighter and more detailed image. Further, the number of pixels on the passenger seat side decreases from 6 to 4, but by changing the backlight brightness to increase from 0.67 to 1, the number of pixels on the passenger seat side is substantially changed. You can see the screen with no brightness.

  In summary, in the eco dual mode, the number of pixels for the other pixel P is made larger than the number of pixels for the one pixel D for the driver of the vehicle on which the display means 12 is mounted, and the eco mode is set. , Reduce the amount of light. As a result, when the driver does not see the image much, the number of pixels for the other pixel P is increased more than the number of pixels for the one pixel D to reduce the amount of light. Power saving can be achieved without substantially degrading the quality.

  In the eco-dual mode, when the one pixel is D and the other pixel is P, the arrangement of the pixels in the display means is alternated as DPPDPPDPP, and the ratio of the number of P to D is substantially The pixel arrangement in the display means 12 in the normal dual mode is completely alternated as in DPDPDPDPD, and the number of P pixels in the eco dual mode is increased from the number of P pixels in the normal dual mode, In addition, the light quantity in the eco dual mode is made smaller than that in the normal dual mode.

  As a result, when the driver does not see the image much, the number of pixels for the other side P can be made larger than the number of pixels for the one side D, and the amount of light can be reduced accordingly. Power saving can be achieved without substantially reducing the quality of the viewed image.

  Further, when switching between the eco dual mode and the normal dual mode, not only the positions of the opaque portion 151 and the transparent portion 152 of the shutter means 15 are shifted, but also the width patterns of the opaque portion 151 and the transparent portion 152 are changed (FIG. 7). And FIG. 8).

  As a result, in the eco dual mode, even when the number of pixels P for the other side is set to be larger than the number of pixels D for the one side D, the positions of the opaque portion 151 and the transparent portion 152 of the shutter unit 15 are shifted, In addition, since the width patterns of the opaque portion 151 and the transparent portion 152 are changed, different images can be reliably viewed from one direction and the other direction.

  Next, in order to obtain a clear and easy-to-see image, the boundary pixel is mainly inserted when the driver instructs the insertion of the boundary pixel with the user operation information 8 in FIG. 1 or in the brightness detection information in FIG. A situation when the boundary pixel insertion unit 3c of the display processing unit 3 operates as instructed by the control unit 2 will be described.

  Even when single mode and dual mode are switched and single mode is selected, eco single mode can be selected by user setting, but the surroundings are too bright in this single mode and eco single mode. When the screen is difficult to see or when there is a boundary pixel insertion request operation from the user, the boundary pixel can be inserted.

  Whether or not to insert this boundary pixel is determined in the main control unit 2. That is, the user control information 8 in FIG. 1 or the ambient brightness detection information 10 from the illuminance sensor or the like is input and the brightness is more than a predetermined level, and it is dazzling and difficult to see the screen. When determined, the program for inserting boundary pixels is activated.

  Similarly, in the normal dual mode and the eco dual mode, when the surroundings are too bright and it is difficult to see the screen, or when there is a boundary pixel insertion request operation from the user, the program for inserting the boundary pixels operates.

  FIG. 9 is a block diagram showing only the configuration for inserting boundary pixels out of the schematic configuration of the in-vehicle display device 1 of FIG. FIG. 10 is a flowchart showing the operation of the block diagram of FIG. In FIG. 9, image sources 1 to 3 correspond to the map image information 4, the TV signal 5, and the DVD signal 6 of FIG. These signals are supplied to the image resolution conversion circuit 3d via the main control unit 2.

  Boundary pixels are inserted to improve visibility because the colors may be mixed and the apparent resolution may drop when the driver side and passenger side images are adjacent. . For example, if the screen pixel for navigation is a blue system and the DVD screen is a red system, adjacent colors are mixed in the navigation screen and the DVD screen, which may not be the original color.

  For this reason, in order to prevent the color of the image seen by the driver and the image seen by the passenger in the passenger seat from being mixed, the adjacent pixel prevents the color of the adjacent pixel from being mixed by setting the pixel boundary as a dark pixel. When the priority determination unit 2c in FIGS. 1 and 9 determines whether the boundary pixel gives priority to the driver or the passenger seat, the boundary pixel insertion unit in FIG. 9 depends on the determination condition. By 3c, a boundary pixel signal is generated so as to be inserted at a fixed position, and the boundary pixel signal is output to the display unit 12 and the liquid crystal shutter 15.

  Many digital images are input to the display means 12 and can be displayed. After capturing digital image signals from the respective image sources 4, 5, and 6 in FIG. 9 in step S1001 in FIG. 10, each digital image signal matches the resolution, size, etc. of the display screen in step S1002. Image resolution conversion is performed.

  Which digital image is displayed on the display screen is determined by a user interface (not shown). In addition, a user's command for an image (for example, enlargement / reduction) is processed by an image conversion unit (not shown). Which of the driver side and the passenger seat side is prioritized is stored as a setting file. Such display setting conditions are read in step S1003.

  In step S1004, the distribution of each pixel including the boundary pixel 40 of the digital image is determined according to the condition read in step S1003. That is, a boundary pixel signal is generated. When the distribution of each pixel is determined, in step S1005, the boundary pixel signal is output to the liquid crystal shutter 15, and the positions of the transparent part and the opaque part of the liquid crystal shutter 15, that is, the ON / OFF position are determined.

  At this time, the width and position of the transmissive part and the non-transmissive part may be finely adjusted by brightness detection information 10 (FIG. 1) from an illuminance sensor that detects external light (not shown). Next, in step S1006, the boundary pixel signal is output to the display means 12, and the image display is performed by synchronizing the operations of the liquid crystal shutter 15 and the display means 12.

  When the single mode is selected in FIG. 4, the flowchart of FIG. 5 is executed, and the normal single mode or the eco single mode is selected. In the single mode, the driver side and the passenger seat side see the same image.

  FIG. 11 is a schematic configuration diagram showing the pixel arrangement and the state of the liquid crystal shutter 15 when the boundary pixel 40 is inserted in the single mode. In FIG. 11, when the driver side and the passenger seat side see the same image, the liquid crystal shutter 15 may be OFF (transparent).

  In the case of FIG. 11, since the liquid crystal shutter 15 is turned off, the light from the backlight 18 is not attenuated by the liquid crystal shutter 15, so the brightness of the backlight 18 is set to the boundary pixel in the normal dual mode (FIG. 14). The eco-mode can be set by reducing the light amount to less than 0.5 with the light amount being 1.

  In this way, single mode display with boundary pixels in steps S502, S503, and S505 in FIG. 5 is executed. That is, the flowchart of FIG. 5 can be made common whether or not boundary pixels are inserted.

  The number and arrangement of the boundary pixels 40 in FIG. 11 may be appropriately changed according to the surrounding brightness. In order to make the character easy to see, the boundary pixel 40 may be inserted into a partial area of the screen in order to automatically darken the character boundary.

  In step S502, S503, and S505 of FIG. 5, the single mode display including the boundary pixel 40 is executed, and the surroundings are brightened by external light such as sunlight by the brightness detection information 10 of FIG. FIG. 12 shows the situation of the liquid crystal shutter 15 and the display means 12 when it is detected or when the user operation information 8 for instructing the self-shadow mode is input to the main control unit 2 of FIG.

  That is, FIG. 12 shows that when the surroundings are high brightness in the single mode, a part of the liquid crystal shutter 15 is turned on to be opaque, the boundary pixel 40 is inserted between the pixels, and the light amount of the backlight 18 FIG. 12 is a schematic configuration diagram illustrating a pixel arrangement and a state of the liquid crystal shutter 15 when the angle is raised from the case of FIG. 11. In FIG. 12, PP and PP and pixels are arranged, but DD and DD may be arranged as in FIG.

  When the sunlight is strong, the backlight 18 loses the outside light and does not function, so that the pixels cannot be seen. Under such conditions, the external light is attenuated by the liquid crystal shutter 15 (the self shadow mode for creating a shadow by the liquid crystal shutter 15 is executed) so that the backlight 18 functions even a little.

  When the brightness detection information 10 in FIG. 1 inputs information such as dazzling sunlight to the main control unit 2, the amount of light reduction is determined according to the brightness of the external light, and the liquid crystal shutter 15 of the liquid crystal shutter 15 is determined based on that. Determine the transmission width. The pixel PP or the pixel DD is determined according to the display conditions of the device (driver priority, passenger seat priority), and the boundary pixel 40 is inserted next to the pixel PP or DD. Then, as the external light is stronger, the width of the opaque portion 151 of the liquid crystal shutter 15 is increased.

  The light quantity of the backlight in FIG. 12 is set to 0.5, with the light quantity in the dual mode being 1. However, even if external light such as sunlight does not hit the display screen of the display unit 12, this function can be used by a user operation as a power saving measure. That is, when the width of the opaque portion 151 of the liquid crystal shutter 15 is increased, the display can be seen even if the backlight 18 is further dimmed. Although it is a little difficult to see, it is possible to save power.

  When the dual mode is selected in FIG. 4, the flowchart of FIG. 6 is executed to select the normal dual mode or the eco dual mode. In this dual mode, the driver side and the passenger seat side see different images.

  FIG. 13 shows an arrangement of the driver pixel D and the passenger side pixel P when the boundary pixel 40 is inserted in the eco-dual mode in which the light amount of the backlight 18 is reduced compared to that in the normal mode (FIG. 14). 3 is a schematic configuration diagram showing a state of an opaque part 151 and a transparent part 152 of the liquid crystal shutter 15. FIG. FIG. 14 is a schematic configuration diagram showing the arrangement of the driver pixel D and the passenger side pixel P and the state of the liquid crystal shutter 15 when the boundary pixel 40 is inserted in the normal dual mode.

  FIG. 13 shows the position of the boundary pixel 40 in the eco dual mode in step S603 in FIG. 6 when the driver does not see the screen very much (or when the passenger seat has priority). The pixel P seen by the passenger seat side is set to be larger than the pixel D on the driver side (the ratio 3 of P with respect to the ratio 1 of D), and the boundary between the pixel P seen by the passenger seat and the pixel D seen by the driver Pixel 40 is arranged.

  On the liquid crystal shutter 15 side, an opaque portion 151 is provided in units of D pixels or P pixels so that the passenger side pixel P can be seen only from the passenger seat and the driver side pixel D can be seen only from the driver side. (ON) and transparent portion 152 (OFF) are arranged. The ON / OFF pattern (two-dimensional dot matrix pattern) of the liquid crystal shutter 15 is determined according to the setting condition of the pixel appearance after the pixel arrangement is determined.

  The two-dimensional dot matrix pattern of the liquid crystal shutter 15 can be finely adjusted according to the driver's line-of-sight position and the position of the passenger seat user. The liquid crystal shutter 15 may be a line (stripe) type shutter as in a known visual field limiting plate, or may be a lattice shape (houndstooth pattern).

  FIG. 14 shows the arrangement of the driver pixel D and the passenger seat side pixel P when the boundary pixel 40 is inserted in the normal dual mode and the state of the liquid crystal shutter 15 in the case of steps S602 and S606 in FIG. It is a schematic block diagram which shows. The ratio of the number of pixels of the pixel D viewed by the driver seat and the pixel P viewed by the passenger seat is set to be the same, and the boundary pixel 40 is disposed between the pixel P viewed by the passenger seat and the pixel D viewed by the driver.

  On the liquid crystal shutter 15 side, ON / OFF is performed in units of D pixels or P pixels so that the passenger side pixel P can be seen only from the passenger seat and the driver side pixel D can be seen only from the driver side. Turn off.

  It should be noted that the display switching from FIG. 7 for the eco dual mode to FIG. 8 for the normal dual mode, and FIG. 13 for the eco dual mode when the boundary pixel 40 is inserted, and the normal dual mode when the boundary pixel is inserted. At the time of switching in FIG. 14 at this time, not only the positions of the opaque portion 151 and the transparent portion 152 of the liquid crystal shutter 15 are shifted, but also the width patterns of the opaque portion 151 and the transparent portion 152 change.

  Thus, as shown in FIG. 13, even when a larger number of pixels P viewed by the passenger seat side than the driver side pixels D are installed, the passenger seat side pixel P can be seen only from the passenger seat by the liquid crystal shutter 15. Thus, the driver's seat side pixel D can control the image so that it can be seen only from the driver side.

  In summary, a boundary pixel insertion unit including the boundary pixel insertion unit 3c in FIG. 1 for inserting the boundary pixel 40 between the one pixel D and the other pixel P is provided. According to this, it is possible to prevent interference between adjacent pixels, for example, the colors of the one-side pixel D and the other-side pixel P are mixed.

  In addition, along with the insertion of the boundary pixel 40, there is a means for switching to the self-shadow mode that increases the width of the opaque portion 151 of the shutter means 15 and increases the amount of light as compared with the eco mode (FIG. 12). According to this, the self-shadow mode makes it easy to see the image when the surroundings of the display means are dazzling due to sunlight or the like.

  Further, in the eco-dual mode when the boundary pixel 40 is inserted, the ratio of the number of pixels for the other pixel P and the number of pixels for the one pixel D is set to 3: 1 (FIG. 13), and the boundary pixel 40 is inserted. The amount of light in the eco-dual mode is made smaller than the amount of light in the normal dual mode (FIG. 14) when the boundary pixel is inserted. According to this, it is possible to reduce the amount of light corresponding to the number of pixels while inserting the boundary pixel 40 in the eco-dual mode to obtain a clear and easy-to-view image.

  The boundary pixel 40 may be automatically inserted in accordance with the brightness detection information 10 input to the main control unit 2 in FIG. According to this, since the insertion of the boundary pixel 40 is automatically performed, a troublesome operation is unnecessary.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows. For example, in the first embodiment described above, image formation in the two directions of the passenger seat side and the driver seat side has been described. However, as described in Patent Document 1, three or more directions including the rear seat are included. Display image formation may be possible.

  Further, as in the known configuration of FIG. 16, it is needless to say that the use of the same pixel position (S1 etc.) on the P side and the D side may be alternately repeated in a time division manner. For this purpose, a time division interlocking control unit is provided in the display processing unit 3 of FIG.

  In addition, when the shutter unit is arranged on the opposite backlight side of the display unit and viewed from the driver, the shutter unit, the display unit, and the backlight are arranged in this order, but the display unit, the shutter unit, and the backlight are arranged in this order. You may arrange in.

  Further, when an element that emits light from each pixel itself (for example, an organic EL display used in a mobile device such as a mobile phone or a car audio) is used as a display unit, a backlight is not necessary. A light amount control means for controlling the applied voltage to control the light amount from each pixel is required instead of the backlight.

  Further, if the eco mode is returned to the normal mode simply by touching the surface of the display comprising the display means and the shutter means with the occupant's hand, the image quality can be improved in an emergency. For this, an infrared or electrostatic touch switch is used. When there is an operation switch or mouse for controlling the image, the eco-mode may be switched to the normal mode by operating the operation switch or mouse.

  Further, the user operation information 8 (FIG. 1) is information from the operation means in the navigation device body 30, but may be information from a switch or the like other than the navigation device body 30. The present invention can also be used for applications other than in-vehicle display devices, such as trains, airplanes, and ships.

DESCRIPTION OF SYMBOLS 1 In-vehicle display device 2 Main control part 2a Driver input / output control part 2b Passenger side input / output control part 3 Display processing part 3c Boundary pixel insertion part 3d Image resolution conversion circuit 3e Backlight control part 3f Liquid crystal shutter control part 3g Luminance correction unit 4 Map image information 5 TV signal 6 DVD signal 7 Vehicle speed information 8 User operation information 9 Occupant detection information 10 Brightness detection information 12 Display means 15 Liquid crystal shutter constituting shutter means 18 Backlight constituting light quantity control means 30 Navigation device Main body 31 Navigation device operation information 32 Vehicle travel information 40 Boundary pixel 151 Opaque portion of liquid crystal shutter 152 Transparent portion of liquid crystal shutter D Driver pixel P Passenger seat side pixel

Claims (13)

Display means having a number of one-side pixels for viewing from one side and a number of other-side pixels for viewing from the other side in order to view at least different images from two adjacent directions of one and the other;
It is arranged on the side surface of the display means, has a large number of opaque portions and a large number of transparent portions, the one pixel is viewed from the one through the transparent portion, and the other pixel is through the transparent portion. Shutter means visible from the other side,
A light quantity control means for controlling the light quantity from the one pixel and the other pixel of the display means, and a control means for controlling the display means, the shutter means, and the light quantity control means,
The control means includes
Means for selecting a single mode for viewing the same screen from the two directions of the one and the other and a dual mode for viewing a different screen;
Means for switching between the eco single mode for reducing the amount of light when the single mode is selected, and a normal single mode for increasing the amount of light over the eco single mode, and the amount of light when the dual mode is selected. A display device comprising means for switching between an eco-dual mode that reduces the amount of light and a normal dual mode that increases the amount of light compared to the eco-dual mode.   The display device according to claim 1, wherein the light amount control unit is a backlight using a light emitting element that emits light to the display unit and the shutter unit.   In the single mode, the shutter unit is fully opened, and the images viewed from the two directions are the same image, and the light amount control unit is controlled to have a light amount smaller than the light amount in the dual mode. The display device according to claim 1 or 2.   The amount of light in the normal single mode is substantially half of the amount of light in the normal dual mode, and the amount of light in the eco single mode is substantially less than half of the amount of light in the normal dual mode. The display device according to any one of claims 1 to 3.   In the eco-dual mode, the number of pixels for the other pixel is made larger than the number of pixels for the one pixel for the driver of the vehicle on which the display means is mounted, and more than in the normal dual mode. The display device according to claim 1, wherein the light amount is decreased.   In the eco-dual mode, when the one pixel is D and the other pixel is P, the arrangement of the pixels in the display means is alternated as DDPDPPDPP, and the ratio of the number of P to D is The pixel arrangement in the display means in the normal dual mode is substantially doubled as in DPDPDPDPD, and the number of P pixels in the eco dual mode is changed to the number of P pixels in the normal dual mode. The display device according to claim 5, wherein the light amount in the eco dual mode is made smaller than the light amount in the normal dual mode.   At the time of switching from the eco dual mode to the normal dual mode, not only the positions of the opaque part and the transparent part of the shutter means are shifted, but also the width pattern of the opaque part and the transparent part is changed. The display device according to claim 5 or 6.   4. The display device according to claim 1, further comprising a boundary pixel insertion unit configured to insert a boundary pixel between the one pixel and the other pixel. 5.   In the single mode, there is means for switching to a self-shadow mode that forms an opaque portion in the shutter means and increases the amount of light as compared with the eco single mode together with the insertion of the boundary pixels. The display device according to claim 8.   In the eco-dual mode when the boundary pixel is inserted, the ratio of the number of pixels of the other pixel P and the number of pixels of the one pixel D is 3 to 1, and the ratio when the boundary pixel is inserted is 3: 1. 10. The display device according to claim 8, wherein a light amount in the eco dual mode is smaller than the light amount in the normal dual mode when the boundary pixel is inserted.   The switching from the eco-single mode to the normal single mode and the switching from the eco-dual mode to the normal dual mode are performed by automatically detecting when the image on the display unit is watched. The display device according to any one of 1 to 10.   In order to automatically detect when the image of the display means is watched, navigation device operation information from a navigation device body of a vehicle equipped with the display means or vehicle travel information from the navigation device body is determined. The display device according to claim 11.   The navigation device operation information or vehicle travel information from the navigation device body is information that the driver of the vehicle has operated the navigation device body, and the vehicle enters the tolerance point or branch point of the navigation device body. 13. The display device according to claim 12, wherein the information is detected information, or the navigation device main body is information obtained by inserting notification information for the driver into the map image information.

Images