JP2005266293A - Liquid crystal display device and image display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a liquid crystal display device capable of displaying a three-dimensional image with even luminance to which a black zone does not exist on a screen even in the case of a large screen larger than the width of human eyes. <P>SOLUTION: The liquid crystal display is constituted so that pitch of a triangular prism column 3a formed on an incidence plane of a double-sided prism sheet 3 becomes larger than pitch of a cylindrical lens column 3b formed on an outgoing radiation surface of the double-sided prism sheet 3. Thus, when observer's eyes are at positions other than a condensing point, the black zone disappears and an area in which the black zone is seen is sharply restricted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a liquid crystal display device capable of displaying a stereoscopic image or a plurality of images simultaneously, and an image display system such as a car navigation device equipped with the liquid crystal display device.

A conventional liquid crystal display device transmits a light guide plate having a light output surface that outputs light incident from an incident end surface, a lenticular sheet disposed opposite to the light output surface of the light guide plate, and light emitted from the lenticular sheet. And a transmissive display panel for displaying a parallax image.
In the conventional liquid crystal display device, since the lenticular sheet gives directivity to the light emitted from the light guide plate, it can be displayed without reducing the resolution when displaying a stereoscopic image. Since the light source is shielded to produce a striped light source, the light use efficiency may be reduced and the display may be darkened (see, for example, Patent Document 1).

  Therefore, recently, instead of using a lenticular sheet, a triangular prism array is formed on the incident surface on which the light emitted from the light exit surface of the light guide plate is incident in order to prevent a decrease in image resolution and brightness. There has been proposed a liquid crystal display device in which a double-sided prism sheet in which a cylindrical lens array is formed on the exit surface from which the emitted light is emitted is arranged.

Japanese Patent Laid-Open No. 5-107663 (paragraph numbers [0012] to [0015], FIG. 2)

Since the conventional liquid crystal display device is configured as described above, instead of the lenticular sheet, a triangular prism array is formed on the incident surface on which light emitted from the light exit surface of the light guide plate is incident, and the incident light If a double-sided prism sheet in which a cylindrical lens array is formed on the exit surface that emits light is disposed, it is possible to prevent a reduction in image resolution and brightness. However, when the screen is larger than the width of the human eye, there is a problem that a black band may be seen at the position in front of the eyes and the visibility may deteriorate.
That is, the center of the cylindrical lens in the cylindrical lens array is directly above the apex of the triangular prism in the triangular prism array, and the focal point of the cylindrical lens is on the plane connecting the apexes of the triangular prism. Since the apex of the prism does not reflect light, when an observer's eyes are positioned on a center line extending in a direction perpendicular to the screen, visibility near the start of the center line appears to be dark.

The present invention has been made to solve the above-described problems, and displays a three-dimensional image having a uniform luminance with no black belt on the screen even on a large screen larger than the width of a human eye. It is an object to obtain a liquid crystal display device capable of performing
Another object of the present invention is to provide an image display system equipped with a liquid crystal display device capable of displaying a three-dimensional image having a uniform luminance with no black band on the screen.

  The liquid crystal display device according to the present invention is formed such that the pitch of the triangular prism row on the incident surface side of the double-sided prism sheet is larger than the pitch of the cylindrical lens row on the output surface side of the double-sided prism sheet. It is.

  According to the present invention, the pitch of the triangular prism row formed on the incident surface of the double-sided prism sheet is configured to be larger than the pitch of the cylindrical lens row formed on the exit surface of the double-sided prism sheet. Therefore, even on a large screen larger than the width of a human eye, there is an effect that it is possible to display a three-dimensional image having a uniform brightness without black bands on the screen.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing the overall configuration of a liquid crystal display device according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of a main part showing a double-sided prism sheet of the liquid crystal display device according to Embodiment 1 of the present invention. .
However, for convenience of explanation, FIG. 2 shows a state in which the pitch of the triangular prism row 3a is formed larger than the pitch of the cylindrical lens row 3b, but FIG. 1 shows the pitch of the triangular prism row 3a. The state where the pitch of the cylindrical lens row 3b is formed to be the same is shown.

  In the figure, a light source 1 a as a first light source emits light toward the incident end face 2 a of the light guide plate 2, and a light source 1 b as a second light source emits light toward the incident end face 2 b of the light guide plate 2. When the light source 1a is emitting light, the light source 1b is turned off (see FIG. 1 (a)), and when the light source 1b is emitting light, the light source 1a is turned off (see FIG. 1 (b)). ).

The light guide plate 2 has an incident end face 2a for incident light emitted from the light source 1a, an incident end face 2b for incident light emitted from the light source 1b, and a light outgoing face 2c for emitting the incident light. ing.
In the double-sided prism sheet 3, a triangular prism row 3 a is formed on the incident surface on which light emitted from the light exit surface 2 c of the light guide plate 2 is incident, and a cylindrical lens array 3 b is formed on the exit surface from which the incident light is emitted. ing. However, the pitch of the triangular prism row 3a formed on the incident surface of the double-sided prism sheet 3 is larger than the pitch of the cylindrical lens row 3b formed on the outgoing surface of the double-sided prism sheet 3 (see FIG. 2). The apex angle of the triangular prism in the triangular prism row 3a and the center line passing through the center of the cylindrical lens in the cylindrical lens row 3b are designed to gather around 20 cm to 100 cm in front of the center of the screen.

The transmissive display panel 4 transmits the light emitted from the emission surface of the double-sided prism sheet 3 and displays a parallax image (stereoscopic image) under the control of the LCD driver 5. The LCD driver 5 displays the parallax image on the transmissive display panel 4 by controlling the transmissive display panel 4 in synchronization with the light sources 1a and 1b.
6a is an observer's right eye and 6b is an observer's left eye.

Next, the operation will be described.
When displaying a parallax image on the transmissive display panel 4, the light source 1a and the light source 1b are alternately turned on. When the light source 1a is turned on, the light emitted from the light source 1a is as shown in FIG. The light enters the light guide plate 2 from the incident end face 2a.
The light incident from the incident end surface 2a of the light guide plate 2 is emitted from the light exit surface 2c of the light guide plate 2, while a part thereof is reflected by the light exit surface 2c. The light reflected by the light exit surface 2c is reflected by the lower surface of the light guide plate 2 and travels again toward the light exit surface 2c.
Therefore, a part of the light incident from the incident end surface 2a of the light guide plate 2 is emitted without being reflected by the light exit surface 2c of the light guide plate 2, and the light reflected by the light exit surface 2c is separated from the light exit surface 2c. The light travels to the right in the figure while repeating reflection on the lower surface, and finally exits from the light exit surface 2c.

On the other hand, when the light source 1b is turned on, as shown in FIG. 1 (b), the light emitted from the light source 1b enters the light guide plate 2 from the incident end face 2b.
The light incident from the incident end face 2b of the light guide plate 2 is emitted from the light exit surface 2c of the light guide plate 2, while a part thereof is reflected by the light exit surface 2c. The light reflected by the light exit surface 2c is reflected by the lower surface of the light guide plate 2 and travels again toward the light exit surface 2c.
Therefore, a part of the light incident from the incident end surface 2b of the light guide plate 2 is emitted without being reflected by the light exit surface 2c of the light guide plate 2, and the light reflected by the light exit surface 2c is separated from the light exit surface 2c. The light travels to the left in the figure while repeatedly reflecting on the lower surface, and finally exits from the light exit surface 2c.

As described above, the light emitted from the light exit surface 2 c of the light guide plate 2 enters from the entrance surface of the double-sided prism sheet 3 and exits from the exit surface of the double-sided prism sheet 3.
However, since the triangular prism row 3a is formed on the incident surface and the cylindrical lens row 3b is formed on the emission surface, the light emitted from the double-sided prism sheet 3 has directivity. .

That is, if the pitch of the triangular prism row 3a and the pitch of the cylindrical lens row 3b are the same, as shown in FIG. 1, all the light emitted from the double-sided prism sheet 3 is aligned in the same direction. When the screen is larger than the width of the human eye, as described above, a black band may be seen at the position in front of the eye, and visibility may deteriorate. In the figure, a black band is visible at the position of the arrow.
However, in the first embodiment, as shown in FIG. 2, since the pitch of the triangular prism row 3a is larger than the pitch of the cylindrical lens row 3b, all the light emitted from the double-sided prism sheet 3 The directivity is such that it is gathered in the vicinity of 20 cm to 100 cm in front of the central portion.
That is, the light emitted from the light sources 1a and 1b is emitted from the transmissive display panel 4 at angles corresponding to the left and right parallaxes.

Since the light emitted from the emission surface of the double-sided prism sheet 3 is transmitted through the transmissive display panel 4, the parallax image is transmitted by the LCD driver 5 controlling the transmissive display panel 4 in synchronization with the light sources 1a and 1b. It is displayed on the mold display panel 4.
As a result, a parallax image is displayed on the transmissive display panel 4, but as shown in FIG. 2, all the light emitted from the double-sided prism sheet 3 is collected in the vicinity of 20 cm to 100 cm in front of the center of the screen. If the observer's eyes are located at the condensing point, the entire transmissive display panel 4 will appear black, but if the observer's eyes are in other positions, the black band will not be visible.

As is apparent from the above, according to the first embodiment, the pitch of the triangular prism row 3a formed on the incident surface of the double-sided prism sheet 3 is formed on the exit surface of the double-sided prism sheet 3. Since it is configured to be larger than the pitch of the cylindrical lens array 3b, it is possible to display a three-dimensional image having a uniform luminance with no black band on the screen even on a large screen larger than the width of the human eye. There is an effect.
That is, if the pitch of the triangular prism array 3a and the pitch of the cylindrical lens array 3b are the same, there are many observation positions where a black band can be seen, but the observer's eyes should be at positions other than the focal point. For example, the black band is not visible, and the area where the black band is visible can be greatly limited.

Embodiment 2. FIG.
3 is a cross-sectional view of a main part showing a light guide plate of a liquid crystal display device according to Embodiment 2 of the present invention. In the figure, the same reference numerals as those in FIG.
The light guide plate 2 has an incident end face 2a for incident light emitted from the light source 1a, an incident end face 2b for incident light emitted from the light source 1b, and a light outgoing face 2c for emitting the incident light. ing. However, although the light exit surface 2c of the light guide plate 2 in FIG. 3 is a flat surface, the lower surface, which is the opposite surface of the light exit surface, is a cylindrical curved surface, and the central portion of the light guide plate 2 is thicker than the peripheral portion. Yes. Note that a scattering surface 2 d is formed on the lower surface of the light guide plate 2.

Since the light guide plate 2 in FIG. 1 in the first embodiment is a flat plate, the nearer to the lit light source is brighter, the farther is darker, and uneven brightness occurs.
The uneven brightness becomes difficult to see because the gradient is reversed between the right eye and the left eye, which may cause fatigue.
Therefore, in the second embodiment, the central portion of the light guide plate 2 is made thicker than the peripheral portion in order to prevent the occurrence of uneven brightness.

Next, the operation will be described.
When the light source 1a is turned on, as shown in FIG. 1A, the light emitted from the light source 1a enters the light guide plate 2 from the incident end face 2a.
As described above, a part of the light incident from the incident end surface 2a of the light guide plate 2 is emitted without being reflected by the light exit surface 2c of the light guide plate 2, and the light reflected by the light exit surface 2c is the light output. The light travels to the right in the figure while repeatedly reflecting on the surface 2c and the scattering surface 2d on the lower surface.

However, at a position close to the incident end face 2a of the light guide plate 2, the thickness of the light guide plate 2 gradually increases as the light travels to the right side in the figure, so that the light traveling angle (emission angle) is the light output of the light guide plate 2. It gradually changes to a small angle close to parallel to the surface 2c. Therefore, the light extraction effect due to scattering on the lower surface is low.
Conversely, at a position close to the incident end face 2b of the light guide plate 2, the light guide plate 2 is gradually reduced in thickness as the light travels to the right side in the figure. It gradually changes to a larger angle with respect to the light exit surface 2c. Therefore, the light extraction effect due to scattering on the lower surface is high.

On the other hand, when the light source 1b is turned on, as shown in FIG. 1 (b), the light emitted from the light source 1b enters the light guide plate 2 from the incident end face 2b.
As described above, a part of the light incident from the incident end surface 2b of the light guide plate 2 is emitted without being reflected by the light exit surface 2c of the light guide plate 2, and the light reflected by the light exit surface 2c is the light output. The light travels to the left in the figure while repeatedly reflecting on the surface 2c and the scattering surface 2d on the lower surface.

However, at a position close to the incident end face 2b of the light guide plate 2, the thickness of the light guide plate 2 gradually increases as the light travels to the left side in the figure, so that the light traveling angle (emission angle) is the light output of the light guide plate 2. It gradually changes to a small angle close to parallel to the surface 2c. Therefore, the light extraction effect due to scattering on the lower surface is low.
Conversely, at a position close to the incident end face 2a of the light guide plate 2, the thickness of the light guide plate 2 gradually decreases as the light travels to the left side in the figure, so the vertical angle of the light traveling direction is the light guide plate 2. It gradually changes to a larger angle with respect to the light exit surface 2c. Therefore, the light extraction effect due to scattering on the lower surface is high.

Here, FIG. 4 is an explanatory diagram showing a calculation result in which the luminance distribution is calculated using the shape of the light guide plate 2 as a parameter.
As is clear from FIG. 4, when the light guide plate 2 has an appropriate radius of curvature as compared with the case where the light guide plate 2 is a flat plate, the luminance is lowered on the light incident side of the light guide plate 2, and conversely, the light is incident on the opposite side The brightness increases on the side. For this reason, it becomes a uniform luminance distribution with a small gradient.

As apparent from the above, according to the second embodiment, the light exit surface 2c of the light guide plate 2 is a flat surface, the opposite surface of the light exit surface is a curved surface, and the central portion of the light guide plate 2 is a peripheral portion. Since it is formed so as to be thicker, it is possible to display a stereoscopic image having a uniform luminance distribution with a small gradient.
In the second embodiment, the light output surface 2c of the light guide plate 2 is a flat surface and the opposite surface of the light output surface is a curved surface. However, the central portion of the light guide plate 2 is thicker than the peripheral portion. The light output surface 2c of the light guide plate 2 may be a curved surface, and the opposite surface of the light output surface may be a flat surface.

Embodiment 3 FIG.
Although not particularly mentioned in the first embodiment, as shown in FIG. 5, when the liquid crystal display device of the first embodiment is installed as a monitor in a car navigation device, the distribution of light emission is left and right. Because of the symmetry, the cover area of the image displayed in the direction of the driver's seat is the same as the cover area of the image displayed in the direction of the passenger seat, and passengers seated in the rear seat (in the middle or right side in the figure) An image viewed by a passenger who is seated) may be an image for a driver. In general, it is considered that the passenger sitting in the rear seat often wants to show the same image as the passenger sitting in the passenger seat, not the image for the driver.

  Therefore, in the third embodiment, in order to make the cover area of the image displayed in the passenger seat direction larger than the cover area of the image displayed in the driver seat direction (see FIG. 6), as shown in FIG. In the triangular prism row 3a formed on the incident surface of the double-sided prism sheet 3, the lengths of two sides of the triangular prisms are different, and the apexes of the triangular prisms are formed to be shifted outward.

Specifically, instead of forming the cross-sectional shape of the triangular prism in the triangular prism array 3a to be an isosceles triangle, the apex of the triangular prism is shifted by one fifth of the pitch in the horizontal direction in the figure. Form an equilateral triangle.
That is, the triangular prism located on the right side of the center of the triangular prism row 3a is formed so that the vertex is shifted by one fifth of the pitch on the right side in the drawing.
On the other hand, the triangular prism located on the left side of the center of the triangular prism array 3a is formed on the left side in the drawing so that the vertex is shifted by one fifth of the pitch.
The boundary between the image displayed in the direction of the driver's seat and the image displayed in the direction of the passenger seat corresponds to the position of the apex of the triangular prism, so that the light emission area is adjusted asymmetrically by shifting the apex of the triangular prism. can do.

  As apparent from the above, according to the third embodiment, the lengths of the two sides of the triangular prisms in the triangular prism array 3a formed on the incident surface of the double-sided prism sheet 3 are different, and the triangular prisms Since the light emission area is asymmetrical, the cover area of the image displayed in the passenger seat direction can be made larger than the cover area of the image displayed in the driver seat direction. Play.

Embodiment 4 FIG.
FIG. 8 is an explanatory view showing a main part of a liquid crystal display device according to Embodiment 4 of the present invention. In the figure, the same reference numerals as those in FIG.
The front light 7 is inserted between the double-sided prism sheet 3 and the transmissive display panel 4, and emits light in a predetermined direction when the light source 7a is turned on. The front light 7 has fine triangular prisms with high transmittance of about 10 μm formed on the entire surface at a pitch of about 50 μm.

In the third embodiment, the liquid crystal display device displays images different in two directions. However, the liquid crystal display device may display different images in three directions.
Specifically, it is as follows.

In the fourth embodiment, a front light 7 is inserted between the double-sided prism sheet 3 and the transmissive display panel 4 in the liquid crystal display device of FIG.
Since the front light 7 has fine triangular prisms with high transmittance of about 10 μm formed on the entire surface at a pitch of about 50 μm, when the light source 7a is lit, it is emitted in a predetermined direction (emitted from the double-sided prism sheet 3). The light is emitted in a different direction). The radiation angle can be adjusted by setting the angle of the fine triangular prism to around 45 degrees.
On the other hand, since the front light 7 is transparent when the light source 7a is turned off, the light is transmitted without disturbing the light distribution characteristics of the light emitted from the double-sided prism sheet 3.

  As apparent from the above, according to the fourth embodiment, since the front light 7 that emits light in a predetermined direction is inserted between the double-sided prism sheet 3 and the transmissive display panel 4, the light sources 1a and 1b If the LCD driver 5 controls the transmissive display panel 4 while switching the lighting of 7a, 7a as appropriate, there is an effect that different images can be displayed in three directions.

Embodiment 5 FIG.
FIG. 9 is a block diagram showing an image display system according to Embodiment 5 of the present invention. In the figure, the pressure sensor unit 11 is composed of a plurality of pressure sensors A to P, and the plurality of pressure sensors A to P are driver seats. Embedded in the seating surface (see FIG. 10). The pressure sensors A to P output a “1” signal when the driver is seated in the driver's seat and a pressure exceeding a predetermined threshold is applied, and outputs a “0” signal if the pressure is less than the threshold. .
The driver posture determination unit 12 monitors the output signals of the pressure sensors A to P of the pressure sensor unit 11 to determine the posture of the driver sitting on the driver's seat (see FIG. 11). Note that the pressure sensor unit 11 and the driver posture determination unit 12 constitute posture determination means.

  If the driver's posture determined by the driver posture determination unit 12 is correct, the screen generation unit 13 generates image data for the driver's seat and image data for the passenger seat (passenger's seat), and the driving is performed. If the person's posture is not correct, only image data for the driver's seat is generated. The screen generator 13 constitutes image data generating means.

The screen display unit 14 is, for example, a display device that includes the liquid crystal display device according to any of the first to fourth embodiments. The screen display unit 14 uses the screen generation unit 13 to generate driver seat image data and passenger seat image data. Is generated, the driver seat image is displayed in the driver seat direction according to the driver seat image data, and the passenger seat image is displayed in the passenger seat direction according to the passenger seat image data. When only the image data for the driver's seat is generated by 13, the driver's seat image is displayed in the driver seat direction and the passenger seat direction according to the image data. The screen display unit 14 constitutes image display means.
FIG. 12 is a flowchart showing the processing contents of the driver posture determination unit 12 in the image display system according to Embodiment 5 of the present invention.

Next, the operation will be described.
The image display system in FIG. 9 displays the driver seat image in the driver seat direction and the passenger seat image in the passenger seat direction, but the driver seated in the driver seat is displayed in the passenger seat direction. There is a case where an image for a passenger seat is being viewed. In this case, there is a possibility that the driver has forcibly lost his / her posture in order to view the passenger seat image. If the driver is driving, it may hinder driving safety.
Therefore, in the fifth embodiment, when the driver forcibly collapses his / her posture, the passenger seat image is not seen so that the driver's correct posture is maintained.
Specifically, it is as follows.

  As shown in FIG. 10, pressure sensors A to P constituting the pressure sensor unit 11 are embedded in the seat surface of the driver seat, and the pressure sensors A to P are obtained when the driver sits on the driver seat. When a pressure equal to or higher than a predetermined threshold is applied, a signal “1” is output, and when the pressure is less than the threshold, a signal “0” is output.

When the driver is properly seated in the driver's seat, the pressure sensors A to P are normally uniformly applied with a pressure equal to or higher than a predetermined threshold, and the pressure sensors A to P send a signal of “1” to the driver posture. Output to the determination unit 12.
On the other hand, for example, when the driver is forcibly deformed in order to view the passenger seat image, for example, the pressure sensors A, B, E, F, I, J, M, and N on the left side of the seating surface are added. Since the pressure is different from the pressure applied to the pressure sensors C, D, G, H, K, L, O, P on the right side of the seating surface, the pressure sensors A, B, E, F, I, A signal “1” is output from J, M, N to the driver posture determination unit 12, and “0” is output from the pressure sensors C, D, G, H, K, L, O, P on the right side of the seating surface. May be output to the driver posture determination unit 12.

The driver posture determination unit 12 monitors the output signals of the pressure sensors A to P of the pressure sensor unit 11 and determines the posture of the driver sitting on the driver's seat.
That is, the driver posture determination unit 12 receives the output signals of the pressure sensors A to P at a predetermined timing from the pressure sensor unit 11 (step ST1).

When the driver posture determination unit 12 receives the output signals of the pressure sensors A to P, for example, the sum WL of the output signals of the pressure sensors A, B, E, F, I, J, M, and N on the left side of the seating surface. Ask for. Further, the sum WR of the output signals of the pressure sensors C, D, G, H, K, L, O, and P on the right side of the seating surface is obtained (step ST2).
Then, the driver posture determination unit 12 obtains a difference X between the left total WL and the right total WR (step ST3), and if the difference X is smaller than a predetermined threshold a (X <a), Although it is determined that the posture is correct (steps ST4 and ST5), if the difference X is equal to or greater than a predetermined threshold (X ≧ a), it is determined that the driver's posture is not correct (steps ST4 and ST6).

As described above, when the driver posture determination unit 12 determines that the driver posture is the correct posture, the screen generation unit 13 generates image data for the driver seat and image data for the passenger seat.
On the other hand, if the driver posture determination unit 12 determines that the driver posture is not correct, only the image data for the driver's seat is generated.
In addition, since the image data generation process may use a known technique, details of the generation process are omitted.

When the screen generating unit 13 generates image data for the driver's seat and image data for the passenger's seat, the screen display unit 14 displays the image for the driver's seat in the direction of the driver's seat according to the image data for the driver's seat, and the assistant An image for the passenger seat is displayed in the direction of the passenger seat according to the image data for the seat.
On the other hand, when the screen generation unit 13 generates only the driver seat image data, the driver seat image is displayed in the driver seat direction and the passenger seat direction in accordance with the image data.

  As is apparent from the above, according to the fifth embodiment, if the driver's posture determined by the driver posture determination unit 12 is correct, the image data for the driver's seat and the image data for the passenger's seat are used. To display the driver's seat image in the driver's seat direction and the passenger's seat image in the passenger's seat direction, and if the driver's posture is not correct, only the driver's seat image data is displayed. Since the image for the driver's seat is displayed in the direction of the driver's seat and the passenger's seat, the image for the passenger's seat cannot be seen even if the driver forcibly loses the posture. Understand that the passenger seat image cannot be seen even if the posture is lost. As a result, the driver's posture can be expected to be maintained in the correct posture thereafter.

In the fifth embodiment, the driver posture determination unit 12 compares the difference X between the left total WL and the right total WR with the threshold value a to determine whether the driver posture is correct. However, for example, a neural network that determines the driver's posture by inputting the distribution of the output signals of the pressure sensors A to P may be used.
In addition, although the pressure sensors A to P are shown symmetrically installed on the seat surface of the driver's seat in the front / rear and left / right directions, they need not be symmetrical.

In the fifth embodiment, the driver attitude determination unit 12 inputs the output signals of the pressure sensors A to P to determine whether or not the driver's attitude is correct, as shown in FIG. As described above, the driving posture imaging unit 15 such as a camera that images the driver's seat from the front is installed, and the driver posture determination unit 16 analyzes the image captured by the driving posture imaging unit 15 so that the driver's posture is correct. It may be determined whether or not.
As a determination method of the posture in the driving posture imaging unit 15, the difference between the video imaged by the driving posture imaging unit 15 and the video imaged during normal driving is obtained in advance, and if the difference is smaller than a predetermined threshold, It is determined that the posture is correct, and if the difference is equal to or greater than a predetermined threshold, it is determined that the posture is not correct.

  Further, in the fifth embodiment, if the driver's posture is correct, the driver's seat image is displayed in the driver's seat direction, and the passenger's seat image is displayed in the passenger's seat direction. If it is not the correct posture, the driver seat image is displayed in the driver's seat direction and the passenger seat direction, but the identification information for identifying the image displayed in the passenger seat direction is superimposed on the driver seat image. You may make it do.

That is, the screen display unit 14 determines whether the driver is currently displaying two screens (a driver seat image in the driver seat direction and a passenger seat image in the passenger seat direction) or a one screen display (driver seat direction and In order to make it possible to distinguish whether the image is for the driver's seat in the direction of the passenger seat), as shown in FIG. When the screen is being displayed, the character information “2 screens are being displayed” is superimposed and displayed. When the current screen is being displayed, the character information “1 screen is being displayed” is displayed in a superimposed manner.
Accordingly, the driver can grasp whether the image displayed in the passenger seat direction is the same as or different from the driver seat image.

Further, if the current display state is a two-screen display, the screen display unit 14 displays in the front passenger seat direction at the upper left of the driver seat image displayed in the driver seat direction as shown in FIG. A reduced image of the passenger seat image being displayed may be displayed in a superimposed manner.
In this case, if the reduced image of the passenger seat image is superimposed on the driver seat image, the driver can grasp that an image different from the driver seat image is displayed in the passenger seat direction. it can.
Note that a reduced image of the driver seat image may be displayed superimposed on the upper left portion of the passenger seat image displayed in the passenger seat direction.

Embodiment 6 FIG.
FIG. 16 is a block diagram showing an image display system according to Embodiment 6 of the present invention. In the figure, the pressure sensor unit 21 is composed of a plurality of pressure sensors AP as in the pressure sensor unit 11 of FIG. The plurality of pressure sensors A to P are embedded in the seat surface of the passenger seat (or rear seat) which is a passenger seat.
The passenger seat determination unit 22 monitors the output signals of the pressure sensors A to P of the pressure sensor unit 21 to determine whether or not a passenger is seated in the passenger seat. The pressure sensor unit 21 and the passenger seat determination unit 22 constitute passenger detection means.

  When the passenger seat determination unit 22 determines that the passenger is seated, the screen generation unit 23 generates driver seat image data and passenger seat image data, and the passenger seat determination unit 22 detects the passenger. If it is determined that the user is not seated, only image data for the driver's seat is generated. The screen generation unit 23 constitutes image data generation means.

The screen display unit 24 is, for example, a display device that includes the liquid crystal display device according to the first to fourth embodiments. The screen display unit 24 uses the screen generation unit 23 to generate driver seat image data and passenger seat image data. Is generated, the driver seat image is displayed in the driver seat direction according to the driver seat image data, and the passenger seat image is displayed in the passenger seat direction according to the passenger seat image data. When only the image data for the driver's seat is generated by 23, the image for the driver's seat is displayed according to the image data. The screen display unit 24 constitutes image display means.
FIG. 17 is a flowchart showing the processing contents of the passenger seat determination unit 22 in the image display system according to the sixth embodiment of the present invention.

Next, the operation will be described.
As shown in FIG. 10, pressure sensors A to P constituting the pressure sensor unit 21 are embedded in the seat surface of the passenger seat, and the pressure sensors A to P are obtained when the passenger sits on the passenger seat. When a pressure equal to or higher than a predetermined threshold is applied, a signal “1” is output, and when the pressure is less than the threshold, a signal “0” is output.

When the passenger is seated in the passenger seat, the pressure sensors A to P are normally uniformly applied with a pressure equal to or higher than a predetermined threshold value, and the pressure sensor A to P outputs a signal “1” to determine the driver posture. To the unit 12.
On the other hand, when the passenger is not seated in the passenger seat, the pressure sensors A to P do not receive a pressure equal to or higher than a predetermined threshold value, and the pressure sensor A to P outputs a signal “0” to the driver posture determination unit 12. Output to. However, when a small baggage is placed on the passenger seat, some pressure sensors may output a signal “1” to the driver posture determination unit 12.

The passenger seat determination unit 22 monitors the output signals of the pressure sensors A to P of the pressure sensor unit 21 and determines whether or not a passenger is seated in the passenger seat.
That is, the passenger seat determination unit 22 receives the output signals of the pressure sensors A to P at a predetermined timing from the pressure sensor unit 21 (step ST11).

When the passenger seat determination unit 22 receives the output signals of the pressure sensors A to P, the passenger seat determination unit 22 calculates the sum W of the output signals of the pressure sensors A to P (step ST12).
Then, if the sum W of the output signals of the pressure sensors A to P is equal to or greater than a predetermined threshold value b (W ≧ b), the passenger seat determination unit 22 determines that a passenger is seated in the passenger seat (step ST13, ST14) If the total sum W is smaller than a predetermined threshold value b (W <b), it is determined that no passenger is seated in the passenger seat (steps ST13, ST15).

As described above, when the passenger seat determination unit 22 determines that a passenger is seated in the passenger seat, the screen generator 23 generates driver seat image data and passenger seat image data.
On the other hand, if the passenger seat determination unit 22 determines that no passenger is seated in the passenger seat, only the image data for the driver seat is generated.

When the screen generation unit 23 generates image data for the driver's seat and image data for the passenger's seat, the screen display unit 24 displays an image for the driver's seat in the direction of the driver's seat according to the image data for the driver's seat. An image for the passenger seat is displayed in the direction of the passenger seat according to the image data for the seat.
On the other hand, when the screen generator 23 generates only the image data for the driver's seat, the driver's seat image is displayed in the driver seat direction and the passenger seat direction according to the image data.

  As apparent from the above, according to the sixth embodiment, when the passenger seat determination unit 22 determines that the passenger is seated in the passenger seat, the image data for the driver seat and the image for the passenger seat are displayed. Data is generated and the driver seat image is displayed in the driver seat direction, and the passenger seat image is displayed in the passenger seat direction. The passenger seat determination unit 22 determines that the passenger is not seated in the passenger seat. If the passenger is not seated in the passenger seat, only the image data for the driver seat is generated and the driver seat image is displayed. This eliminates the need for processing to be performed, and has the effect of suppressing power consumption.

  In the sixth embodiment, the passenger seat determination unit 22 inputs the output signals of the pressure sensors A to P to determine whether or not the passenger is seated in the passenger seat. May be installed, and it may be determined whether or not the passenger is seated in the passenger seat by referring to the video imaged by the camera. In addition, the presence or absence of a passenger may be determined using an infrared sensor.

Further, in the sixth embodiment, when the passenger is not seated in the passenger seat, the image data generation process for the passenger seat is not performed. The image may not be displayed.
In this case, the power consumption can be further reduced.

Moreover, in this Embodiment 6, although what showed whether a passenger is seated in the passenger seat was shown, you may make it determine whether a passenger is seated in the backseat. .
Alternatively, it is determined whether or not the passenger is seated in the passenger seat, and whether or not the passenger is seated in the rear seat, and depending on the determination result, the driver seat direction, the passenger seat direction, Alternatively, the image display in the rear seat direction may be controlled.
Further, it may be determined whether or not the driver is seated in the driver's seat, and when the driver is not seated, the image in the driver's seat direction may not be displayed.

Embodiment 7 FIG.
FIG. 18 is a block diagram showing an image display system according to Embodiment 7 of the present invention. In the figure, a GPS satellite 30 is a satellite orbiting the earth and includes GPS signals including latitude, longitude and altitude information. To send. The current position detection unit 31 is equipped with a GPS antenna or a gyro that receives a GPS signal transmitted from the GPS satellite 30, and the current position and traveling direction of the vehicle based on the GPS signal transmitted from the GPS satellite 30, a gyro detection signal, or the like. Is detected. The current position detection unit 31 constitutes a position / direction detection unit.
The map data storage unit 32 is a memory such as a hard disk storing map data, and constitutes a map storage means.

The sharp curve determination unit 33 refers to the map data stored in the map data storage unit 32, confirms the curvature of the road on the traveling direction side from the current position detected by the current position detecting unit 31, and If the road curvature is equal to or greater than a predetermined threshold (reference curvature), it is determined that a sharp curve exists ahead. The sharp curve determination unit 33 constitutes curvature confirmation means.
When the sharp curve determination unit 33 determines that there is no sharp curve ahead, the 3D image generation unit 34 generates right-eye image data and left-eye image data as 3D image (stereoscopic image) image data. When the sharp curve determination unit 33 determines that there is a sharp curve ahead, right-eye or left-eye image data is generated as image data for a planar image. Note that the 3D image generation unit 34 constitutes an image data generation unit.

The screen display unit 35 is, for example, a display device configured from the liquid crystal display devices of the first to fourth embodiments. The screen display unit 35 receives the right-eye image data and the left-eye image data by the 3D image generation unit 34. When generated, a 3D image is displayed according to both image data, and when the right-eye or left-eye image data is generated by the 3D image generation unit 34, a planar image is displayed according to the image data. The screen display unit 35 constitutes image display means.
FIG. 19 is a flowchart showing the processing contents of the sharp curve determination unit 33 in the image display system according to the seventh embodiment of the present invention.

Next, the operation will be described.
The screen display system in FIG. 18 normally displays a 3D image on a liquid crystal display device. However, when the road is sharply curved, the viewpoints of the driver and passengers are shifted. May appear unnatural and appear unnatural.
Therefore, in the seventh embodiment, the 3D image display is stopped and the planar image is displayed under a situation where the viewpoints of the driver and the passenger are shifted.
Specifically, it is as follows.

The current position detection unit 31 receives GPS signals transmitted from a plurality of GPS satellites 30 orbiting the earth, and calculates the current position (latitude, longitude, altitude) of the vehicle from the plurality of GPS signals.
The current position detection unit 31 compares the previous calculation result with the current calculation result to detect the traveling direction of the vehicle (step ST31).

The sharp curve determination unit 33 acquires map data around the current position detected by the current position detection unit 31 from the map data stored in the map data storage unit 32 (step ST32). The curvature of a road on the traveling direction side of (for example, a road 10 m ahead of the current position) is confirmed.
In addition, since the calculation process of the curvature of the road of the advancing direction side should just use the well-known technique mounted in the recent car navigation apparatus, the detail of the calculation process is abbreviate | omitted.

If the curvature of the road on the traveling direction side is equal to or greater than a predetermined threshold, the sharp curve determination unit 33 determines that there is a sharp curve ahead (step ST33) and prohibits display of a 3D image (step ST34). ).
On the other hand, if the curvature of the road on the traveling direction side is smaller than a predetermined threshold, it is determined that there is no sharp curve ahead (step ST33), and display of a 3D image is permitted (step ST35).

The 3D image generation unit 34 generates image data for the right eye and image data for the left eye as the image data for the 3D image when the steep curve determination unit 33 permits display of the 3D image.
On the other hand, when the sharp curve determination unit 33 prohibits the display of the 3D image, the image data for the right eye or the left eye is generated as the image data for the planar image.
In addition, since the production | generation process of the image data for 3D images should just use a well-known technique, the detail of a production | generation process is abbreviate | omitted.

When the 3D image generation unit 34 generates image data for the right eye and image data for the left eye, the screen display unit 35 displays a 3D image according to both image data.
On the other hand, when the 3D image generation unit 34 generates image data for the right eye or the left eye, a planar image is displayed according to the image data.

  As is apparent from the above, according to the seventh embodiment, the curvature of the road on the traveling direction side is confirmed from the current position detected by the current position detecting unit 31, and the curvature of the road on the traveling direction side is a predetermined threshold value. If it is above, the sharp curve determination part 33 which determines that the sharp curve exists ahead is provided, and when the sharp curve determination part 33 determines that there is no sharp curve ahead, the image data for the right eye and the left eye Image data is generated and a 3D image is displayed, and when the sharp curve determination unit 33 determines that a sharp curve exists ahead, it generates right-eye or left-eye image data and displays a planar image. As a result, the 3D image display is prohibited and a flat image is displayed at the time of a sharp curve where the driver's viewpoint is likely to shift to the side. The situation where you can see the correct image An effect that can be avoided.

  In addition, when the curvature of the road on the traveling direction side gradually decreases, the plane image may be gradually changed to the 3D image. For example, it is possible to display a part of the screen as a 3D image and gradually increase the ratio of the 3D image.

Embodiment 8 FIG.
FIG. 20 is a block diagram showing an image display system according to Embodiment 8 of the present invention. In the figure, a vertical acceleration sensor 41 detects acceleration in the vertical direction of the vehicle, and a lateral acceleration sensor 42 indicates the traveling direction of the vehicle. The acceleration in the lateral direction is detected. The vertical acceleration sensor 41 and the lateral acceleration sensor 42 constitute acceleration detection means.
The 3D display determination unit 43 compares the acceleration detected by the vertical acceleration sensor 41 with a predetermined threshold (reference acceleration), and compares the acceleration detected by the lateral acceleration sensor 42 with a predetermined threshold (reference acceleration). If any one of the accelerations exceeds a predetermined threshold, the display of the 3D image is prohibited, and if both the accelerations do not exceed the predetermined threshold, the display of the 3D image is permitted.

  When the 3D display determination unit 43 permits the display of the 3D image, the 3D image generation unit 44 generates right-eye image data and left-eye image data as 3D image data, and the 3D display determination unit 43 If the display of the 3D image is prohibited by this, the image data for the right eye or the left eye is generated as the image data for the plane image. The 3D display determination unit 43 and the 3D image generation unit 44 constitute an image data generation unit.

The screen display unit 45 is, for example, a display device configured from the liquid crystal display devices of the first to fourth embodiments. The screen display unit 45 receives the right-eye image data and the left-eye image data by the 3D image generation unit 44. When generated, a 3D image is displayed according to both image data, and when the right-eye or left-eye image data is generated by the 3D image generation unit 44, a planar image is displayed according to the image data. The screen display unit 45 constitutes image display means.
FIG. 21 is a flowchart showing the processing contents of the 3D display determination unit 43 in the image display system according to the eighth embodiment of the present invention.

Next, the operation will be described.
The screen display system of FIG. 20 normally displays a 3D image on a liquid crystal display device. However, when the vehicle is suddenly stopped or suddenly started, or when a sudden handle is made, the viewpoints of the driver and passengers are shifted. As a result, an image displayed in 3D does not look three-dimensional and may appear unnatural.
Therefore, in the eighth embodiment, the 3D image display is stopped and the planar image is displayed under the situation where the viewpoints of the driver and the passenger are shifted.
Specifically, it is as follows.

The vertical acceleration sensor 41 detects the acceleration of the vehicle vertical method. For example, when the vehicle stops suddenly or starts suddenly, the acceleration of the vertical method of the vehicle increases.
The lateral acceleration sensor 42 detects acceleration in the lateral direction with respect to the traveling direction of the vehicle. For example, when the steering wheel is suddenly operated, the lateral acceleration of the vehicle increases.

When the vertical acceleration sensor 41 detects the acceleration of the vertical method of the vehicle (step ST41), the 3D display determination unit 43 compares the acceleration of the vertical method with a predetermined threshold (step ST42), and the acceleration of the vertical method is If the predetermined threshold value is exceeded, display of the 3D image is prohibited (step ST43).
Further, when the lateral acceleration sensor 42 detects the acceleration of the lateral method of the vehicle (step ST41), the 3D display determination unit 43 compares the acceleration of the lateral method with a predetermined threshold (step ST42), and If the acceleration exceeds a predetermined threshold, display of the 3D image is prohibited (step ST43).
If the acceleration in the vertical method does not exceed the predetermined threshold and the acceleration in the horizontal method does not exceed the predetermined threshold (step ST42), the 3D display determination unit 43 permits display of the 3D image (step ST42). ST44).

If the 3D display determination unit 43 permits display of a 3D image, the 3D image generation unit 44 generates right-eye image data and left-eye image data as 3D image data.
On the other hand, if the 3D display determination unit 43 prohibits the display of the 3D image, the image data for the right eye or the left eye is generated as the image data for the planar image.

When the 3D image generation unit 44 generates image data for the right eye and image data for the left eye, the screen display unit 45 displays a 3D image according to both image data.
On the other hand, when the 3D image generation unit 44 generates image data for the right eye or the left eye, a planar image is displayed according to the image data.

  As apparent from the above, according to the eighth embodiment, the acceleration detected by the vertical acceleration sensor 41 is compared with a predetermined threshold, and the acceleration detected by the lateral acceleration sensor 42 is set as a predetermined threshold. In comparison, if any one of the accelerations exceeds a predetermined threshold, the display of the 3D image is prohibited. If both the accelerations do not exceed the predetermined threshold, the 3D display determination unit permits the display of the 3D image. 43, if the display of the 3D image is permitted, the image data for the right eye and the image data for the left eye are generated to display the 3D image, and if the display of the 3D image is prohibited, the right eye or Since the image data for the left eye is generated and the planar image is displayed, the 3D image display is prohibited and the planar image is displayed under a situation where the driver's viewpoint is likely to be shifted. Na Achieves a result, for example, an advantage of being able to avoid a situation that looks unnatural images when the sudden start.

Embodiment 9 FIG.
FIG. 22 is a block diagram showing an image display system according to Embodiment 9 of the present invention. In the figure, a remote controller 51 is a remote controller operated when the driver switches the driver seat image, and the remote controller 52 is displayed by the passenger. This is a remote controller operated when switching the passenger seat image.
The remote control input unit 53 inputs an operation signal output from the remote controls 51 and 52 and outputs the operation signal to the screen generation unit 54. The remote control 51, 52 and the remote control input unit 53 constitute a switching operation accepting unit.

  The screen generation unit 54 refers to the remote control type information included in the operation signal output from the remote control input unit 53, specifies whether the remote control operator is a driver or a passenger, and controls the remote control operator. If the driver is a driver, the image data for the driver's seat is updated according to the key code included in the operation signal. If the remote control operator is a passenger, the key code included in the operation signal is updated. Therefore, the image data for the passenger seat is updated. The screen generating unit 54 constitutes an operator specifying unit and an image data updating unit.

The screen display unit 55 is, for example, a display device that includes the liquid crystal display device of the first to fourth embodiments. The screen display unit 55 displays a driver seat image in the driver seat direction according to the driver seat image data. Then, the passenger seat image is displayed in the direction of the passenger seat in accordance with the passenger seat image data. The screen display unit 55 constitutes image display means.
FIG. 23 is an explanatory diagram showing the correspondence between key types and key codes, and FIG. 24 is a flowchart showing the processing contents of the screen generation unit 54 in the image display system according to the ninth embodiment of the present invention.

Next, the operation will be described.
When the driver switches the driver seat image, the remote controller 51 is operated. For example, when a simple map screen is displayed as an image for a driver's seat, an operation such as scrolling a map display area can be considered.
On the other hand, when the passenger switches the passenger seat image, the remote controller 52 is operated. For example, when the detailed map screen is displayed as the passenger seat image, an operation of switching the map display form from a planar image to a 3D image can be considered.

The remote control input unit 53 inputs an operation signal output from the remote controls 51 and 52 and outputs the operation signal to the screen generation unit 54.
Here, the operation signal output from the remote controllers 51 and 52 is, for example, a 4-byte code (value), and the lower 3 bytes of this code are the buttons of the remote controllers 51 and 52 as shown in FIG. This is the code assigned to.
The most significant byte of this code indicates the type of the remote controllers 51 and 52. For example, “0” is assigned to the remote controller 51 and “1” is assigned to the remote controller 52.
The infrared communication method between the remote controllers 51 and 52 and the remote controller input unit 53 is the same as the communication method between a remote controller such as a TV and a remote controller receiver in addition to the car navigation device.

When receiving the operation signal output from the remote control input unit 53 (step ST51), the screen generation unit 54 refers to the most significant byte included in the operation signal to determine whether the remote control operator is the driver. The person is identified (step ST52).
When specifying that the remote control operator is the driver, the screen generation unit 54 refers to the lower 3 bytes included in the operation signal and specifies the operation content. For example, if the lower three bytes are “104”, it is recognized that the “→” button has been pressed, and the operation content assigned to the “→” button is confirmed.
-Button assignment example Button Operation contents "↑" → Up scroll "↓" → Down scroll "→" → Right scroll "←" → Left scroll

When the remote controller operator is a driver, for example, if the simple map screen is displayed as the driver seat image, the screen generator 54 updates the image data of the simple map screen according to the operation content (step ST53). ).
On the other hand, if the remote control operator is a passenger, for example, if the detailed map screen is displayed as the passenger seat image, the image data on the detailed map screen is updated according to the operation content (step ST54).

When the image data of the simple map screen is updated as the driver's seat image by the screen generation unit 54, the screen display unit 55 switches the display of the simple map screen according to the updated image data.
On the other hand, when the image data of the detailed map screen is updated as the passenger seat image by the screen generation unit 54, the display of the detailed map screen is switched according to the updated image data.

  As is apparent from the above, according to the ninth embodiment, whether the remote control operator is the driver or not is referred to by referring to the remote control type information included in the operation signal output from the remote control input unit 53. If the remote control operator is a driver, the driver's seat image data is updated according to the key code included in the operation signal. If the remote control operator is a passenger, Since the image data for the passenger seat is updated according to the key code included in the operation signal, the passenger seat image is erroneously switched by the driver's operation, and the driver's seat image is operated by the passenger's operation. There is an effect that it is possible to reliably prevent malfunctions that are erroneously switched.

In the ninth embodiment, the remote controller 51 for the driver's seat and the remote controller 52 for the passenger's seat are prepared and the remote controller 52 determines which operation signal is input from which remote controller. Infrared light receiving units are installed at two locations on the driver's seat side and the passenger seat side, and it is determined whether the operation is performed by the driver or the passenger by the infrared intensity received by the two infrared light receiving units. It may be. When the infrared intensity on the driver's seat side is stronger, it is determined that the operation is performed by the driver, and when the infrared intensity on the passenger seat side is higher, it is determined that the operation is performed by the passenger.
In this case, it is only necessary to prepare one remote controller, so that cost reduction can be realized.

  In addition, one input device (center console) is installed between the driver's seat and the passenger seat, the input device is imaged from the upper part of the vehicle, and it is operated by the hand (arm) extended from the driver's seat side by image recognition. To determine whether the operator is a driver or a passenger, by determining whether the driver is operated by a hand (arm) extended from the passenger seat side Also good. If the display monitor has a touch panel function instead of the center console, the operation on the touch panel may be similarly determined by image processing.

It is also possible to distinguish between the driver and the passenger using a plurality of highly directional microphones and generate image data corresponding to the voice input of the person who is speaking (speaking) For the identification of the person, refer to the following references). The voice input method can be realized by using a voice recognition method used in the current car navigation system.
It is also possible to install a microphone on the headrest and read the utterance by vibrations from the human neck. Can recognize if there is.
References:
Takanobu Nishiura, Takeshi Yamada, Satoshi Nakamura, Kiyohiro Shikano, “Multiple Sound Source Location Estimation by CSP Method Using Microphone Array”, IEICE Transactions D-II, Vol. J83-D-II, no. 8, pp. 1713-1721, Aug. 2000

Embodiment 10 FIG.
FIG. 25 is a block diagram showing an image display system according to Embodiment 10 of the present invention. In the figure, a content generation unit 61 generates driver seat image data and passenger seat image data, and driver seat image data. Voice data for the passenger seat and voice data for the passenger seat are generated. The content generation unit 61 constitutes image data generation means and audio data generation means.
The screen display unit 62 is, for example, a display device that includes the liquid crystal display device of the first to fourth embodiments. The screen display unit 62 is a driver seat according to the driver seat image data generated by the content generation unit 61. The driver seat image is displayed in the direction, and the passenger seat image is displayed in the passenger seat direction according to the passenger seat image data generated by the content generation unit 61. The screen display unit 62 constitutes image display means.

  The driver seat side voice output unit 63 outputs the driver seat voice in the driver seat direction in accordance with the driver seat voice data generated by the content generation unit 61. The passenger seat side voice output unit 64 outputs the passenger seat voice in the direction of the passenger seat in accordance with the passenger seat voice data generated by the content generation unit 61. The driver seat side voice output unit 63 and the passenger seat side voice output unit 64 constitute a voice output unit.

Next, the operation will be described.
The content generation unit 61 generates driver seat image data and passenger seat image data, and also generates driver seat voice data and passenger seat voice data.
For example, route map guide map data is generated as driver seat image data, and guide voice data is generated as driver seat voice data.
Also, video data at the time of DVD video playback is generated as image data for the passenger seat, and audio data at the time of DVD video playback is generated as the audio data for the passenger seat.

  When the content generation unit 61 generates image data for the driver's seat and image data for the passenger's seat, the screen display unit 62 displays the driver's seat image in the direction of the driver's seat according to the image data for the driver's seat. The passenger seat image is displayed in the direction of the passenger seat according to the image data.

The driver's seat side audio output unit 63 is installed in front of the driver's seat as shown in FIG. 26. For example, the driver's seat side audio output unit 63 is not disclosed in Japanese Patent Laid-Open Nos. 11-234784 and 11-145915. A directional speaker is mounted, and the driver's seat voice is output locally to the place where the driver is sitting according to the driver's seat voice data generated by the content generation unit 61.
The passenger seat side audio output unit 64 is installed in front of the passenger seat, is equipped with a super-directional speaker similar to the driver seat side audio output unit 63, and is used for the passenger seat generated by the content generation unit 61. According to the voice data, the passenger seat voice is output locally at the place where the passenger is sitting.

As is apparent from the above, according to the tenth embodiment, the driver's seat voice is output in the direction of the driver's seat in accordance with the driver's seat voice data generated by the content generation unit 61 and is generated by the content generation unit 61. Since the voice for the passenger seat is output in the direction of the passenger seat according to the voice data for the passenger seat, the driver can listen only to the voice for the driver seat without being bothered by the voice for the passenger seat. The passenger can listen to only the passenger seat voice without being bothered by the driver seat voice.
As a result, the driver can listen to the route guidance voice without being disturbed by the sound that the passenger is listening to, for example, and the passenger in the passenger seat can view the DVD image regardless of the route guidance situation. And enjoy audio.

  In the tenth embodiment, the driver-seat-side audio output unit 63 and the passenger-seat-side audio output unit 64 are mounted with superdirective speakers. However, the speaker is mounted on the headrest of the driver seat or the passenger seat. May be installed, and the driver's seat voice and passenger's seat voice may be transmitted to the driver and passengers by the vibration of the speaker.

Similarly to the sixth embodiment, it is determined whether or not a passenger or driver is seated in the passenger seat or driver seat. If the passenger or driver is not seated, an image is displayed. Similarly to the above, voice output may not be performed.
Similarly to the fifth embodiment, it is determined whether or not the driver's posture is normal, and if the driver's posture is not normal, only the driver's seat voice is output. Good.

  In the tenth embodiment, the DVD video and audio are output to the passenger seat side. However, the present invention is not limited to this. For example, a detailed route guidance map and a detailed route guidance audio are output. May be. At this time, the voice output parameter may be output as a male voice parameter to the driver's seat, and may be output as a female voice parameter to the passenger seat.

Embodiment 11 FIG.
FIG. 27 is a block diagram showing an image display system according to Embodiment 11 of the present invention. In the figure, the screen setting unit 71 is equipped with man-machine interface functions such as a keyboard and a mouse, and the vehicle is running. Sometimes the setting of the screen type displayed in the driver seat direction and the passenger seat direction is accepted, and the setting of the screen type displayed in the driver seat direction and the passenger seat direction when the vehicle is stopped is accepted. The screen setting unit 71 constitutes screen setting means.
The traveling determination unit 72 refers to the measurement value of the vehicle speedometer to determine whether or not the vehicle is traveling. The traveling determination unit 72 constitutes a traveling determination unit.

The screen generation unit 73 acquires the setting content corresponding to the determination result of the travel determination unit 72 from the screen setting unit 71, and generates image data according to the setting content. The screen generator 73 constitutes image data generating means.
The screen display unit 74 is, for example, a display device configured from the liquid crystal display devices of the first to fourth embodiments. The screen display unit 74 displays an image according to the image data generated by the screen generation unit 73. The screen display unit 74 constitutes image display means.

Next, the operation will be described.
A driver or a passenger operates the screen setting unit 71 to set the type of screen to be displayed when the vehicle is traveling and to set the type of screen to be displayed when the vehicle is stopped.
FIG. 28 is an explanatory diagram showing the setting contents of the screen type. In FIG. 28, for example, when the vehicle is running, a simple navigation map is displayed on the driver's seat side and a detailed navigation map is displayed on the passenger seat side. When the vehicle is stopped, the setting contents for displaying the detailed navigation map on both the driver seat side and the passenger seat side are shown. However, the setting content of the screen type may be set in advance by default.

The travel determination unit 72 refers to the measurement value of the vehicle speedometer to determine whether or not the vehicle is traveling.
The screen generation unit 73 acquires the setting content corresponding to the determination result of the travel determination unit 72 from the screen setting unit 71, and generates image data according to the setting content.
For example, NO. When the setting content of 2 is enabled, if the determination result of the traveling determination unit 72 indicates that the vehicle is traveling, image data of a simple navigation map is generated on the driver's seat side, and the passenger seat On the side, detailed navigation map image data is generated.
On the other hand, if the determination result of the traveling determination unit 72 indicates that the vehicle is stopped, only the image data of the detailed navigation map is generated.

When the screen generation unit 73 generates image data of a simple navigation map as image data for a driver's seat and generates image data of a detailed navigation map as image data for a passenger seat, the screen display unit 74 is simplified in the direction of the driver's seat. The navigation map is displayed, and the detailed navigation map is displayed in the direction of the passenger seat.
When the screen generator 73 generates only the image data of the detailed navigation map, the detailed navigation map is displayed in both the driver seat direction and the passenger seat direction.

  As is apparent from the above, according to the eleventh embodiment, the setting content corresponding to the determination result of the travel determination unit 72 is acquired from the screen setting unit 71, and image data is generated and displayed according to the setting content. Since it comprised so, there exists an effect which can switch a display content suitably according to the driving | running | working state of a vehicle.

It is sectional drawing which shows the whole structure of the liquid crystal display device by Embodiment 1 of this invention. It is principal part sectional drawing which shows the double-sided prism sheet of the liquid crystal display device by Embodiment 1 of this invention. It is principal part sectional drawing which shows the light-guide plate of the liquid crystal display device by Embodiment 2 of this invention. It is explanatory drawing which shows the calculation result by which luminance distribution was calculated using the shape of the light-guide plate as a parameter. It is explanatory drawing which shows the cover area of the image which a liquid crystal display device displays. It is explanatory drawing which shows the cover area of the image which a liquid crystal display device displays. It is principal part sectional drawing which shows the double-sided prism sheet of the liquid crystal display device by Embodiment 3 of this invention. (A) is a top view which shows the front light of the liquid crystal display device by Embodiment 4 of this invention, (b) is a side view which shows the principal part of the liquid crystal display device by Embodiment 4 of this invention, (c) is It is a disassembled perspective view which shows the principal part of the liquid crystal display device by Embodiment 4 of this invention. It is a block diagram which shows the image display system by Embodiment 5 of this invention. It is explanatory drawing which shows arrangement | positioning of a pressure sensor. It is explanatory drawing which shows the connection relationship between a pressure sensor and a driver posture determination part. It is a flowchart which shows the processing content of the driver | operator attitude | position determination part in the image display system by Embodiment 5 of this invention. It is a block diagram which shows the other image display system by Embodiment 5 of this invention. It is explanatory drawing which shows the identification information which identifies the image currently displayed on the passenger seat direction. It is explanatory drawing which shows the image on which the reduced image is superimposed and displayed. It is a block diagram which shows the image display system by Embodiment 6 of this invention. It is a flowchart which shows the processing content of the passenger seat determination part in the image display system by Embodiment 6 of this invention. It is a block diagram which shows the image display system by Embodiment 7 of this invention. It is a flowchart which shows the processing content of the sharp curve determination part in the image display system by Embodiment 7 of this invention. It is a block diagram which shows the image display system by Embodiment 8 of this invention. It is a flowchart which shows the processing content of the 3D display determination part in the image display system by Embodiment 8 of this invention. It is a block diagram which shows the image display system by Embodiment 9 of this invention. It is explanatory drawing which shows the correspondence of a key classification and a key code. It is a flowchart which shows the processing content of the screen generation part in the image display system by Embodiment 9 of this invention. It is a block diagram which shows the image display system by Embodiment 10 of this invention. It is explanatory drawing which shows the installation position of a driver's seat side audio | voice output part. It is a block diagram which shows the image display system by Embodiment 11 of this invention. It is explanatory drawing which shows the setting content of the kind of screen.

Explanation of symbols

  1a light source (first light source), 1b light source (second light source), 2 light guide plate, 2a incident end surface, 2b incident end surface, 2c light exit surface, 2d scattering surface, double-sided prism sheet, 3a triangular prism array, 3b Cylindrical lens array, 4 transmissive display panel, 5 LCD driver, 6a Observer's right eye, 6b Observer's left eye, 7 Front light, 11 Pressure sensor unit (posture determination means), 12 Driver posture determination unit (posture determination) Means), 13 screen generation unit (image data generation unit), 14 screen display unit (image display unit), 15 driving posture imaging unit (posture determination unit), 16 driver posture determination unit (posture determination unit), 21 pressure sensor Part (passenger detection means), 22 passenger seat determination part (passenger detection means), 23 screen generation part (image data generation means), 24 screen display part (image display means), 30 G PS satellite, 31 current position detection unit (position direction detection unit), 32 map data storage unit (map storage unit), 33 sharp curve determination unit (curvature confirmation unit), 34 3D image generation unit (image data generation unit), 35 Screen display unit (image display unit), 41 Vertical acceleration sensor (acceleration detection unit), 42 Lateral acceleration sensor (acceleration detection unit), 43 3D display determination unit (image data generation unit), 44 3D image generation unit (image (Data generation means), 45 screen display section (image display means), 51 remote control (switching operation reception means), 52 remote control (switching operation reception means), 53 remote control input section (switching operation reception means), 54 screen generation section (operation Person specifying means, image data updating means), 55 screen display section (image display means), 61 content generation section (image data generation means, audio data) Generating means), 62 screen display section (image display means), 63 driver's seat side voice output section (voice output means), 64 passenger seat side voice output section (voice output means), 71 screen setting section (screen setting means), 72 travel determination unit (travel determination unit), 73 screen generation unit (image data generation unit), 74 screen display unit (image display unit).

Claims (13)

  A light guide plate having an incident end face for incident light emitted from the first light source and an incident end face for incident light emitted from the second light source, and having a light exit surface for emitting the incident light; A double-sided prism sheet in which a triangular prism array is formed on an incident surface on which light emitted from the light exit surface of the optical plate is incident, and a cylindrical lens array is formed on an exit surface from which the incident light is emitted; In a liquid crystal display device including a transmissive display panel that displays a parallax image by transmitting light emitted from the exit surface of the sheet, the pitch of the triangular prism rows formed on the entrance surface of the double-sided prism sheet is A liquid crystal display device, wherein the pitch is larger than the pitch of the cylindrical lens array formed on the exit surface of the double-sided prism sheet.   A light guide plate having an incident end face for incident light emitted from the first light source and an incident end face for incident light emitted from the second light source, and having a light exit surface for emitting the incident light; A double-sided prism sheet in which a triangular prism array is formed on an incident surface on which light emitted from the light exit surface of the optical plate is incident, and a cylindrical lens array is formed on an exit surface from which the incident light is emitted; A liquid crystal display device comprising a transmissive display panel that transmits a light emitted from an emission surface of a sheet and displays a parallax image, wherein a central portion of the light guide plate is thicker than a peripheral portion. .   A light guide plate having an incident end face for incident light emitted from the first light source and an incident end face for incident light emitted from the second light source, and having a light exit surface for emitting the incident light; A double-sided prism sheet in which a triangular prism array is formed on an incident surface on which light emitted from a light exit surface of an optical plate is incident, and a cylindrical lens array is formed on an exit surface that emits the incident light, and the double-sided prism In a liquid crystal display device including a transmissive display panel that displays a parallax image by transmitting light emitted from the exit surface of the sheet, the prisms in the triangular prism array formed on the entrance surface of the double-sided prism sheet A liquid crystal display device characterized in that the lengths of the two sides are different and the apex of the prism is shifted outward.   A light guide plate having an incident end face for incident light emitted from the first light source and an incident end face for incident light emitted from the second light source, and having a light exit surface for emitting the incident light; A double-sided prism sheet in which a triangular prism array is formed on an incident surface on which light emitted from the light exit surface of the optical plate is incident, and a cylindrical lens array is formed on an exit surface from which the incident light is emitted; In a liquid crystal display device including a transmissive display panel that transmits a light emitted from an emission surface of a sheet and displays a parallax image, a front light that emits light in a predetermined direction includes the double-sided prism sheet and the transmissive display A liquid crystal display device inserted between panels.   If the posture determination means for determining the posture of the driver seated in the driver's seat and the driver's posture determined by the posture determination means is correct, the image data for the driver's seat and the passenger's seat If image data is generated and the driver's posture is not correct, image data generating means for generating only the image data for the driver's seat, and the image data for the driver's seat and the passenger's seat by the image data generating means When the image data for the passenger is generated, the driver seat image is displayed in the driver seat direction according to the driver seat image data, and the passenger seat image is displayed in the passenger seat direction according to the passenger seat image data. And when only the image data for the driver's seat is generated by the image data generating means, the image display hand for displaying the driver's seat image in the driver seat direction and the passenger seat direction according to the image data Image display system with a door.   6. The image display system according to claim 5, wherein the image display means superimposes identification information for identifying an image displayed in the passenger seat direction on the driver seat image.   Passenger detection means for determining whether or not a passenger is seated in the passenger seat, and when the passenger detection means determines that the passenger is seated, image data for the driver's seat and the passenger When the image data for the seat is generated and the passenger detection means determines that the passenger is not seated, the image data generation means for generating only the image data for the driver's seat, and the image data generation means When the driver seat image data and the passenger seat image data are generated, the driver seat image is displayed in the direction of the driver seat according to the driver seat image data, and the passenger seat image data is displayed. When the passenger seat image is displayed in the passenger seat direction and only the image data for the driver's seat is generated by the image data generating means, the image display hand displays the driver seat image according to the image data. Image display system with a door.   When only image data for the driver's seat is generated by the image data generating means, the image display means displays the driver's seat image in the driver's seat direction according to the image data, and the driver's seat image in the passenger's seat direction. The image display system according to claim 7, wherein the image display system is not displayed.   With reference to the map data stored in the map storage means, the position / direction detection means for detecting the current position and traveling direction of the vehicle, the map storage means storing map data, and the position / direction detection means Curvature confirmation means for confirming the curvature of the road on the traveling direction side from the detected current position, and when the curvature of the road confirmed by the curvature confirmation means is smaller than the reference curvature, image data for the right eye and image data for the left eye When the curvature of the road is larger than the reference curvature, image data generation means for generating right-eye or left-eye image data, and right-eye image data and left-eye image data are generated by the image data generation means. When generated, a stereoscopic image is displayed according to both image data, and when image data for the right eye or left eye is generated by the image data generation means, The image display system comprising an image display means for displaying a planar image in accordance with image data.   Acceleration detecting means for detecting the acceleration of the vehicle, and when the acceleration detected by the acceleration detecting means is smaller than the reference acceleration, the right eye image data and the left eye image data are generated, and the acceleration is larger than the reference acceleration. When the right-eye image data and the left-eye image data are generated by the image data generation unit that generates right-eye or left-eye image data, and the image data generation unit, a stereoscopic image is generated according to both image data. An image display system comprising: an image display unit configured to display a planar image according to the image data when the image data for the right eye or the left eye is generated by the image data generation unit.   When the switching operation accepting means for accepting the switching operation of the currently displayed image, the operator identifying means for identifying the operator of the switching operation, and the operator identified by the operator identifying means is a driver, When the driver seat image data is updated according to the switching operation received by the switching operation receiving means and the operator specified by the operator specifying means is a passenger, the switching received by the switching operation receiving means Image data updating means for updating image data for the passenger seat according to the operation, and displaying the driver seat image in the direction of the driver seat according to the image data for the driver seat, and according to the image data for the passenger seat An image display system comprising image display means for displaying a passenger seat image in the passenger seat direction.   Image data generating means for generating driver seat image data and passenger seat image data, driver seat voice data and passenger data generating voice data, and image data generation The driver seat image is displayed in the direction of the driver seat according to the driver seat image data generated by the means, and the passenger in the passenger seat direction is displayed according to the passenger seat image data generated by the image data generating means. An image display means for displaying an image for a seat, and a driver's seat voice is output in the direction of the driver's seat according to the voice data for the driver's seat generated by the voice data generating means. An image display system comprising: voice output means for outputting passenger seat voice in the passenger seat direction in accordance with passenger seat voice data.   Set the type of screen displayed in the driver's seat direction and passenger's seat direction when the vehicle is traveling, and the type of screen displayed in the driver's seat direction and passenger's seat direction when the vehicle is stopped Screen setting means for setting, traveling determination means for determining whether or not the vehicle is traveling, and setting contents corresponding to the determination result of the traveling determination means are acquired from the screen setting means, and according to the setting contents An image display system comprising: image data generating means for generating image data; and image display means for displaying an image according to the image data generated by the image data generating means.

Images