JP2003084681A - On-vehicle display device and car-navigation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such problem that reflection caused by a large angle of view of a display screen on the right-and-left side glasses of a vehicle in the case where the angle of view is larger more than necessary, is an obstacle to a driving when checking the right-and-left fields of view in the turnaround of the vehicle, and the confirmation of pedestrians. SOLUTION: When arranging a liquid crystal display device at a dashboard central part, luminance distribution or contrast distribution in each right and left side is set to have a vertex between approximately 25 to 35 degrees, and preferably at approximately 30 degrees. This optimizes visibility on the driver's seat side and front passenger seat side. The reflection of a display image on the right-and-left side glasses is prevented by setting a value so as to decrease by >=30% or more at approximately 40 to 60 degrees from the center at each right and left side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted display device and a car navigation system, and more particularly to a vehicle-mounted display device arranged and used in the center of a dashboard of a vehicle and a car navigation system using the same as a monitor.

[0002]

2. Description of the Related Art In recent years, car navigation systems have rapidly become popular. In this car navigation system, from the perspective of safety, while the passenger is traveling, the passenger in the passenger seat can see the display image on the display and inform the driver, while the passenger can check if there is no passenger or the driver himself. If you want to do so, stop the car and check the displayed image.
Therefore, it is necessary to surely be able to visually recognize the display screen of the display device from both the driver's seat and the passenger seat.

By the way, as a display device of a car navigation system, a liquid crystal display device having a feature of small size and low power consumption is generally used. It is known that this liquid crystal display device has different viewing angles depending on the viewing angle of the display screen for the same liquid crystal voltage. If this viewing angle dependency is large, the range of angles for viewing the display screen is limited.

In the liquid crystal display device, conventionally, by obtaining different liquid crystal pixel voltages in one pixel or in adjacent pixels with respect to the same signal voltage, it is possible to widen the viewing angle of the liquid crystal panel as a whole and further to obtain the compensation potential. By gradually increasing or decreasing the value of in accordance with the scanning from the upper part of the screen to the lower part, the liquid crystal voltage is sequentially changed from the upper part of the screen to the lower part, so that the viewing angle dependency due to the viewing angle of the screen is eliminated. Technology is known (Patent No. 3011072)
(See the official gazette).

There is also known a technique in which a liquid crystal display device has a luminance distribution that exhibits the highest luminance in the front direction and that gradually decreases in a direction beyond a predetermined viewing angle as the viewing angle increases. (See Japanese Patent No. 3106055).

[0006]

However, the former conventional technique is premised on a liquid crystal display device used as a monitor of a TV (television), a computer, etc., and is designed to actively widen the viewing angle. Therefore, when used as an in-vehicle display device, if the viewing angle is unnecessarily wide, the display screen on the left and right side windows of the car will be reflected by the wide viewing angle, and the car will turn and pedestrians will be confirmed. When checking the left and right field of view, it becomes an obstacle to driving.

On the other hand, the latter prior art is premised on a liquid crystal display device such as a notebook personal computer, a portable liquid crystal TV, a video integrated liquid crystal TV, etc., which exhibits the highest brightness in the front direction and exceeds a predetermined viewing angle. Since the brightness distribution in the vertical direction gradually decreases as the viewing angle increases, when the brightness distribution gradually decreases when used as an in-vehicle display device, the left and right side windows of the car are affected. Reflection due to the brightness of the display screen occurs, which is an obstacle to driving when checking the left and right fields of view such as turning a car or checking pedestrians.

In a vehicle-mounted display device, unlike a computer or TV application, the viewing angle of the display device,
It is desired that the luminance distribution has directivity. In particular, liquid crystal display devices for car navigation systems are required to have improved visibility from both the driver's seat side and the passenger's seat side.
In addition, it is necessary that the other parts, especially the side glass, are free of the image reflected on the liquid crystal display device so as not to hinder the driver's driving.

The present invention has been made in view of the above problems, and an object thereof is to improve the visibility of a display image from the driver's seat side and the passenger's seat side and to display the display image on a side glass. An object of the present invention is to provide a vehicle-mounted display device that eliminates glare.

[0010]

The on-vehicle display device according to the present invention is arranged in the center of the front of the vehicle, and has apexes between the horizontal center of the display screen and the horizontal directions of about 25 ° to about 35 °. If the luminance distribution or the contrast distribution or the apex is taken as 100%, the luminance or the contrast is 30 from the center of the display screen to about 40 ° to 60 ° on the left and right respectively.
It has a brightness distribution or a contrast distribution that changes by more than%. This on-vehicle display device is used as a monitor in a car navigation system.

In the vehicle-mounted display device having the above-mentioned configuration or the car navigation system using the same as a monitor, by having a brightness distribution or a contrast distribution having vertices between approximately 25 ° to approximately 35 ° on each of the left and right sides of the display screen, Since the passenger's seat and the driver's seat are seated at angular positions of about 30 ° to the left and right with respect to the display surface, the visibility of the displayed image from the driver's seat side and the passenger's seat side is optimized. Further, by having a brightness distribution or a contrast distribution in which the brightness or the contrast changes by 30% or more between the left and right sides from the center at about 40 ° to about 60 °, the brightness or the contrast with respect to the left and right side windows can be set to the driver side or the passenger side. Since it is extremely lower than that, it is possible to prevent the display image from being reflected on the left and right side glasses.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing the internal structure of a vehicle-mounted display device according to the present invention, for example, a vehicle-mounted liquid crystal display device.

In FIG. 1, a liquid crystal panel (display panel)
Reference numeral 11 denotes a TFT array substrate 12 formed with TFTs (Thin Film Transistors) that are switching elements of each pixel arranged in an array, display electrodes, and the like, and a counter substrate 13 formed with counter electrodes and the like. And a liquid crystal is enclosed between both substrates 12 and 13. TFT array substrate 12 and counter substrate 13
For this, a transparent insulating substrate, for example, a glass substrate is used.

Polarizing plates 14 and 15 each having a wide viewing angle film and transmitting or absorbing a specific polarization component are attached to the front surface and the back surface of the liquid crystal panel 11, respectively. The liquid crystal panel 11 is positioned by the panel positioning stopper 17 with respect to the case-shaped chassis 16 having the opening 16A, and the opening 16A is positioned.
Is attached to. Inside this chassis 16,
Backlights 18A and 18B such as cold cathode fluorescent tubes are arranged on the upper side (right side of the drawing) and the lower side (left side of the drawing) of the arrangement area of the liquid crystal panel 11, respectively.

On the back side of the liquid crystal panel 11, a light control film 19, an upward prism sheet 20, and a diffusion sheet 2 are provided.
1, the downward prism sheet 22, the light guide plate 23, and the reflection sheet 24 are sequentially arranged. These constituent members form a back optical system together with the backlights 18A and 18B. FIG. 2 is a perspective view showing the configuration of the rear optical system excluding the light control film 19.

In this rear optical system, the backlight 1
Reference numerals 8A and 18B are light sources for liquid crystal display, and are provided along the left-right direction of the display screen. The light control film 19 has a function of cutting light in the vertical direction with respect to a driver or a passenger in a passenger seat (hereinafter, may be simply referred to as “driver”). The upward prism sheet 20 is shown in FIG.
As is clear from the above, the prismatic prism lenses are arranged in the vertical direction at a predetermined interval, and the prism surface is arranged upward, so that the vertical light is directed toward the driver. It acts to collect light.

The diffusion sheet 21 includes a backlight 18A,
The liquid crystal panel 11 is uniformly irradiated with the light supplied from 18B to smooth the brightness. As shown in FIG. 2, the downward prism sheet 22 has a configuration in which prism lenses having a triangular prism shape are arranged in the left-right direction at predetermined intervals, and the prism surface is arranged downward so that the backlight is It acts to scatter the light given from 18A and 18B. Then, a desired luminance distribution can be obtained by changing the array distribution of the prism lenses of the downward prism sheet 22.

The light guide plate 23 includes backlights 18A and 18A.
The light provided from B (hereinafter referred to as “backlight light”) is guided to the liquid crystal panel 11 side. A large number of small and large light reflecting members 25 are arranged in the light guide plate 23. As is clear from FIG. 3A, these light reflecting members 25 have, for example, a pentahedron shape and reflect backlight light in the normal direction of the liquid crystal panel 11. At this time, the backlight light in the horizontal direction is as shown in FIGS.
It is incident on the A surface or the B surface and is reflected by these reflecting surfaces A and B. The brightness distribution of the liquid crystal panel 11 can be set by adjusting the reflection angles C and D of the reflection surfaces A and B.

Regarding the structure of the light reflecting member 25,
The structure is not limited to the above-mentioned pentahedron structure, but a desired structure can be achieved as long as the structure is a polyhedron having three or more surfaces.

The on-vehicle liquid crystal display device according to the present embodiment having the above structure is used, for example, as a monitor of a car navigation system. As shown in FIG. Will be placed. In this way, when the liquid crystal display device is arranged in the center of the dashboard, the passenger seat and the driver's seat are positioned at an angle of approximately 30 ° to the left and right with respect to the display surface of the liquid crystal display device.

[Embodiment 1] Therefore, in Embodiment 1, in the characteristics of the brightness or the contrast of the liquid crystal display device, as shown in FIG. The brightness distribution or the contrast distribution is set so as to have the apex at 30 °. Here, regarding the brightness distribution, by adjusting the distribution of the prism lenses of the downward prism sheet 22 or adjusting the angle of the reflecting surface of the light reflecting member 25 arranged in the light guide plate 23, the right and left sides are each approximately 25 °. It is possible to secure the peak of the brightness at about 35 °.

On the other hand, regarding the contrast distribution, the amplitude of the signal voltage applied to the liquid crystal of the liquid crystal panel 11 is adjusted, and the viewing angles of the wide viewing angle films in the polarizing plates 14 and 15 are adjusted to about 25 ° on each side. ~ About 35
A peak of contrast can be secured between °. In Figure 6,
The relationship between the signal voltage applied to the liquid crystal and the transmittance of the liquid crystal is shown. By changing the transmittance with respect to the signal voltage V, the contrast can be substantially adjusted. Specifically, by reducing the amplitude of the signal voltage V, the contrast represented by the transmittance can be suppressed to a low level.

As described above, when the liquid crystal display device is arranged in the central portion of the dashboard, the right and left sides are each about 25 °.
By setting the brightness distribution or the contrast distribution so as to have vertices at approximately 35 °, preferably approximately 30 ° on each of the left and right sides, the passenger seat and the driver's seat are positioned at angular positions of about 30 ° on the left and right sides with respect to the display surface. Since the user sits down, the visibility of the display image from the driver's seat side and the passenger's seat side is optimized.

Although the peak value on the driver's side and the peak value on the passenger's side are set to be substantially the same in the luminance or contrast distribution chart of FIG. 5, there is no passenger in the passenger's seat. Since the driver side is the main, setting the peak value on the driver side higher than the peak value on the passenger side will make the visibility of the display image from the driver side more optimal. can do.

[Second Embodiment] In the second embodiment, as in the first embodiment, in the luminance distribution or the contrast distribution having the vertices between about 25 ° to about 35 ° on the left and right sides, preferably about 30 ° on the left and right sides, As shown in FIG. 7, the value is set to decrease by 30% or more at about 40 ° to about 60 ° to the left and right from the center. Similar to the case of the first embodiment, regarding the brightness, the distribution adjustment of the prism lens of the downward prism sheet 22 and the light reflecting member 25 arranged in the light guide plate 23 are performed.
Can be realized by adjusting the angle of the reflective surface, and the contrast can be realized by adjusting the amplitude of the signal voltage applied to the liquid crystal or the viewing angle of the wide viewing angle film.

As described above, in the state where the visibility on the driver's seat side and the passenger's seat side are optimized, each side from the center is approximately 40 °.
By setting the brightness distribution or the contrast distribution so that the value decreases by 30% or more at about 60 °, the brightness or contrast on the left and right side glasses becomes extremely lower than that on the driver's seat side or the passenger's seat side. It is possible to prevent reflection on the left and right side glasses of the. As a result, it is possible to avoid a driving failure of the vehicle due to the display image of the liquid crystal display device being reflected on the left and right side windows of the vehicle.

[Third Embodiment] In the third embodiment, as in the first embodiment, in the brightness distribution or the contrast distribution having the vertices between about 25 ° to about 35 ° on the left and right sides, preferably about 30 ° on the left and right sides, As shown in FIG. 8, the value is set to be reduced to 50% or less at each of about 40 ° or more to the left and right from the center. Also in this case, the brightness can be realized by adjusting the distribution of the prism lenses of the downward prism sheet 22 and the angle adjustment of the reflecting surface of the light reflecting member 25 arranged in the light guide plate 23, and the contrast can be applied to the liquid crystal. This can be achieved by adjusting the amplitude of the signal voltage to be applied and the viewing angle of the wide viewing angle film.

In this way, in the state in which the visibility on the driver's seat side and the passenger's seat side are optimized, each side from the center is approximately 40 °.
By setting the luminance distribution or the contrast distribution so that the value decreases to 50% or less at about 60 °, it is possible to more reliably prevent the display image from being reflected on the left and right side glasses as compared with the case of the second embodiment. You can

[Embodiment 4] In Embodiment 4, as shown in FIG. 9, in a brightness distribution or a contrast distribution having an apex at the center (about 0 °), values are set at about 40 ° to about 60 ° to the left and right from the center. Is reduced by 30% or more, preferably 50% or more. Also in this case, regarding the brightness, the distribution adjustment of the prism lenses of the downward prism sheet 22 and the light reflecting member 25 arranged in the light guide plate 23 are performed.
Can be realized by adjusting the angle of the reflective surface, and the contrast can be realized by adjusting the amplitude of the signal voltage applied to the liquid crystal or the viewing angle of the wide viewing angle film.

As described above, in the case of the brightness distribution or the contrast distribution having the apex at the center, the visibility between the driver's seat and the passenger's seat becomes optimal, and the visibility on the driver's seat side and the passenger's seat side slightly deteriorates. , 40 ° to the left and right from the center
By setting the value to decrease by 30% or more at about 60 °, the brightness or contrast with respect to the left and right side windows becomes extremely lower than that on the driver's seat side or the passenger's side. It is possible to prevent glare.

[Embodiment 5] In Embodiment 5, as shown in FIG. 10, in a constant luminance distribution or contrast distribution from the center to the left and right approximately 35 °, each of the center and the left and right approximately 40.
The value is set to decrease by 30% or more, preferably 50% or more in the range of 60 ° to 60 °. Also in this case, the brightness can be realized by adjusting the distribution of the prism lenses of the downward prism sheet 22 and the angle adjustment of the reflecting surface of the light reflecting member 25 arranged in the light guide plate 23, and the contrast can be applied to the liquid crystal. This can be achieved by adjusting the amplitude of the signal voltage to be applied and the viewing angle of the wide viewing angle film.

As described above, since the brightness distribution or the contrast distribution is constant from the center to the left and right approximately 35 °, the visibility on the driver's seat side and the passenger's seat side can be optimally set including the intermediate position, and Left and right from the center approximately 40 ° to approximately 6
By setting the brightness distribution or the contrast distribution so that the value decreases by 30% or more at 0 °, the brightness or contrast on the left and right side glasses becomes extremely lower than that on the driver's side or the passenger's side. It is possible to prevent the reflection on the side glass of.

[Sixth Embodiment] In a sixth embodiment, as shown in FIG. 11, in a brightness distribution or a contrast distribution having an apex at the center (approximately 0 °), the right and left sides from the center are approximately 40 °.
The value is set so as to rapidly decrease to about 10% between about 60 °. Also in this case, the brightness can be realized by adjusting the distribution of the prism lenses of the downward prism sheet 22 and the angle adjustment of the reflecting surface of the light reflecting member 25 arranged in the light guide plate 23, and the contrast can be applied to the liquid crystal. This can be achieved by adjusting the amplitude of the signal voltage to be applied and the viewing angle of the wide viewing angle film.

As described above, in the case of the brightness distribution or the contrast distribution having the apex at the center, the visibility between the driver's seat and the passenger's seat becomes optimum, and the visibility on the driver's seat side and the passenger's seat side slightly deteriorates. , 40 ° to the left and right from the center
By setting the brightness distribution or the contrast distribution so that the value sharply decreases to about 10% in the range of about 60 °, the brightness or contrast on the left and right side glasses is sharply lower than that on the driver side or the passenger side. Therefore, it is possible to reliably prevent the display image from being reflected on the left and right side glasses.

Here, the measurement of the brightness and the contrast of the liquid crystal display device will be described with reference to FIGS. 12 and 13. FIG. 12 is an explanatory diagram of the definition of the measurement point.
3 is a diagram showing an actual measurement point on the display area. Figure 1
3A is a side view of the liquid crystal display device, and FIG. 3B is a plan view thereof.

As is apparent from FIGS. 12 and 13,
In measuring the brightness and contrast of the liquid crystal display device, a reference line C is drawn in the horizontal direction in the center of the display area, and the brightness and contrast are measured along the reference line C.
At this time, the point D at the center is set to 0 °, and the left and right viewing angles are used as parameters for measurement. Then, in order to obtain the luminance distribution or the contrast distribution according to each of the above-described embodiments, regarding the luminance, the distribution of the prism lenses of the downward prism sheet 22 and the light reflecting member 2 arranged in the light guide plate 23 are obtained.
Adjust the angle of the reflective surface of 5, and for the contrast,
The amplitude of the signal voltage applied to the liquid crystal and the viewing angle of the wide viewing angle film are adjusted.

In the above embodiments, the case where the present invention is applied to a liquid crystal display device using a liquid crystal cell as a display cell has been described as an example, but the present invention is not limited to the liquid crystal display device, and the display cell EL using an electroluminescence (EL) device as
The invention can be similarly applied to other display devices such as a display device, and the point is that the vehicle-mounted display device can have the brightness distribution or the contrast distribution according to each of the above-described embodiments.

FIG. 14 is a block diagram showing an example of the configuration of the car navigation system according to the present invention. Figure 1
4, a position sensor 31 is connected to a distance sensor 32 and an azimuth sensor 33. Position estimation unit 31
Is composed of, for example, a microcomputer, reads the moving distance and azimuth angle variation information from the distance sensor 32 and the azimuth angle sensor 33, and estimates the current position of the vehicle by dead reckoning navigation based on these information.

The position estimating unit 31 is further provided with GPS (Globa
l Positioning System) The receiver 34 is connected.
The position estimation unit 31 performs a process of correcting the estimation result based on the azimuth / position information from the GPS receiver 34, and gives the final current position information of the vehicle to the monitor 35. The map information recorded on the recording medium 36 such as a CD-ROM is displayed on the monitor 35 through the driver 37 to display a map around the current location, and the vehicle supplied from the position estimation unit 31 on the map. The current position of is displayed.

In the car navigation system having the above structure, the liquid crystal display device according to the above-described embodiment, that is, the liquid crystal display device having the brightness distribution or the contrast distribution according to any of Examples 1 to 6 is used as the monitor 35. Here, when the liquid crystal display device having the brightness distribution or the contrast distribution according to the first or fifth embodiment is used, the visibility on the driver's seat side and the passenger's seat side can be optimally set. Further, in the case of the fifth embodiment, it is possible to prevent the display image from being reflected on the left and right side glasses.

When the liquid crystal display device having the brightness distribution or the contrast distribution according to the second or third embodiment is used, the visibility on the driver's seat side and the passenger's seat side can be optimally set and the display can be performed. It is possible to prevent the image from being reflected on the left and right side glasses. When the liquid crystal display device having the luminance distribution or the contrast distribution according to the fourth or sixth embodiment is used, the visibility of the driver's seat side and the passenger's seat side is slightly deteriorated, but the display image is reflected on the left and right side glasses. You can prevent crowding.

As is clear from the above description, by using the liquid crystal display device according to the above-described embodiment as the monitor 35 in the car navigation system, it is most suitable for the driver and passengers in the passenger seat. In addition to providing navigation information in the display state,
Since the displayed image is not reflected on the left and right side glasses, it is possible to provide the driver with an optimal driving environment.

In this application example, the case where the on-vehicle display device according to the present invention is used as a monitor of a car navigation system is taken as an example, but the present invention is not limited to this application example and, for example, a monitor for an on-vehicle TV. It is also possible to use

[0044]

As described above, according to the present invention,
In a vehicle-mounted display device or a car navigation system using the same as a monitor, a brightness distribution or a contrast distribution having vertices between the horizontal center of the display screen and approximately 25 ° to approximately 35 ° on each side is set. As a result, the passenger seat and the driver seat are seated at angular positions of approximately 30 ° to the left and right with respect to the display surface, so that the visibility of the display image from the driver seat side and the passenger seat side is optimized.

Further, about 40 ° to about 60 ° to the left and right from the center, respectively.
By setting the brightness distribution or the contrast distribution in which the brightness or contrast changes by 30% or more between °, the brightness or contrast for the left and right side windows becomes extremely lower than that on the driver's side or the passenger's side. It is possible to prevent the display image from being reflected on the left and right side glasses.

[Brief description of drawings]

FIG. 1 is a sectional view showing an internal structure of a vehicle-mounted liquid crystal display device according to the present invention.

FIG. 2 is a perspective view showing a configuration of a rear optical system excluding a light control film.

3A and 3B are diagrams showing an example of a configuration of a light reflecting member arranged in a light guide plate, FIG. 3A is a perspective view thereof, and FIG. 3B is a front view thereof.

FIG. 4 is a diagram showing an arrangement relationship of in-vehicle display devices.

FIG. 5 is a diagram showing a luminance distribution or a contrast distribution according to the first embodiment.

FIG. 6 is a VT characteristic diagram of a liquid crystal display device.

FIG. 7 is a diagram showing a luminance distribution or a contrast distribution according to the second embodiment.

FIG. 8 is a diagram showing a luminance distribution or a contrast distribution according to the third embodiment.

FIG. 9 is a diagram showing a luminance distribution or a contrast distribution according to the fourth embodiment.

FIG. 10 is a diagram showing a luminance distribution or a contrast distribution according to Example 5.

FIG. 11 is a diagram showing a luminance distribution or a contrast distribution according to the sixth embodiment.

FIG. 12 is an explanatory diagram of the definition of a measurement point.

13A and 13B are views showing actual measurement points on the display area, FIG. 13A is a side view of the liquid crystal display device, and FIG. 13B is a plan view thereof.

FIG. 14 is a block diagram showing an example of a configuration of a car navigation system according to the present invention.

[Explanation of symbols]

11 ... Liquid crystal panel, 14, 15 ... Polarizing plate, 18A, 18
B ... Backlight, 20 ... Upward prism sheet, 21
... Diffusion sheet, 22 ... Downward prism sheet, 23 ... Light guide plate, 25 ... Light reflecting member, 31 ... Position estimating unit, 32 ... Distance sensor, 33 ... Azimuth sensor, 34 ... GPS receiver,
35 ... Monitor

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G08G 1/0969 G08G 1/0969 5C080 G09G 3/20 642 G09G 3/20 642E 5G435 680 680Q 5H180 3/36 3 / 36 (72) Inventor Hidemasa Yamaguchi 6-35 Kita-Shinagawa, Shinagawa-ku, Tokyo F-Term (reference) within Sony Corporation 2F029 AA02 AB01 AB07 AB12 AB13 AC02 AC09 AC16 2H088 EA23 HA18 HA23 HA28 MA02 2H091 FA08X FA08Z FA14Z FA21Z FA41Z FD12 FD13 LA17 2H093 NC02 NC41 NC48 ND03 5C006 AA16 AF46 EC09 FA55 FA59 5C080 AA10 BB05 DD01 EE28 JJ02 JJ05 JJ06 KK20 KK23 GG05 GG GG FF GG FF GG FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF WHITE WHITE WHITE WHITE WHITE WHITE WHITE WHITE WHITE WHITE WHICH ARE READY. FF22 FF33

Claims (24)

[Claims] 1. A vehicle-mounted type vehicle having a brightness distribution or a contrast distribution, which is arranged in a central portion in the front of the vehicle and has apexes between the horizontal center of the display screen and approximately 25 ° to 35 ° on the left and right sides. Display device. 2. The brightness distribution or the contrast distribution has a change of 30% or more in brightness or contrast between about 40 ° and about 60 ° on the left and right sides of the center of the display screen in the left-right direction when the vertex is 100%. The in-vehicle display device according to claim 1, wherein: 3. The on-vehicle display according to claim 2, wherein the brightness distribution or the contrast distribution has a brightness or a contrast of 50% or less at about 40 ° or more from the center of the display screen in the left-right direction. apparatus. 4. The on-vehicle display device according to claim 1, wherein the display cells which are arranged in an array and constitute a display panel are liquid crystal cells. 5. A downward prism sheet that scatters light is provided in an optical system that guides light from a light source to the display panel, and the brightness distribution is set by adjusting the distribution of prism lenses of the downward prism sheet. The in-vehicle display device according to claim 4, wherein: 6. A light guide plate, wherein a light reflecting member is built in an optical system for guiding light from a light source to the display panel, and light provided from the light source is reflected by the light reflecting member and guided to the display panel side. The vehicle-mounted display device according to claim 4, further comprising: setting the brightness distribution by adjusting an angle of a reflection surface of the light reflection member. 7. The in-vehicle display device according to claim 4, wherein the contrast distribution is set by adjusting an amplitude of a signal voltage applied to the liquid crystal cell. 8. The display panel has a wide viewing angle filter, and a polarizing plate that transmits or absorbs a specific polarization component is attached to the display panel, and the contrast distribution is adjusted by adjusting the viewing angle of the wide viewing angle filter. 5. The in-vehicle display device according to claim 4, wherein: 9. The vehicle is arranged in the center in the front of the vehicle and has a vertex of 1.
When set to 00%, the left and right sides from the center of the display screen are approximately 40
An in-vehicle display device having a brightness distribution or a contrast distribution in which the brightness or the contrast changes by 30% or more between 0 ° and about 60 °. 10. The in-vehicle display device according to claim 9, wherein the brightness distribution or the contrast distribution has a vertex at the center of the display screen in the left-right direction. 11. The in-vehicle display device according to claim 9, wherein the brightness distribution or the contrast distribution is such that the brightness or the contrast is constant from the center of the display screen in the left-right direction to about 35 ° on the left and right sides. 12. The brightness distribution or the contrast distribution is about 40 ° left and right from the center of the display screen in the left-right direction.
10. The in-vehicle display device according to claim 9, wherein the brightness or the contrast sharply decreases to about 10% between about 60 °. 13. The on-vehicle display device according to claim 9, wherein the display cells which are arranged in an array and constitute a display panel are liquid crystal cells. 14. An optical system that guides light from a light source to the display panel includes a downward prism sheet that scatters light, and the brightness distribution is set by adjusting the distribution of prism lenses of the downward prism sheet. The in-vehicle display device according to claim 13, wherein: 15. A light guide plate, wherein a light reflecting member is built in an optical system for guiding light from a light source to the display panel, and light provided from the light source is reflected by the light reflecting member and guided to the display panel side. The in-vehicle display device according to claim 13, further comprising: setting the brightness distribution by adjusting an angle of a reflection surface of the light reflection member. 16. The in-vehicle display device according to claim 13, wherein the contrast distribution is set by adjusting an amplitude of a signal voltage applied to the liquid crystal cell. 17. The display panel has a wide viewing angle filter, and a polarizing plate that transmits or absorbs a specific polarization component is attached to the display panel. The contrast distribution is adjusted by adjusting the viewing angle of the wide viewing angle filter. 14. The vehicle-mounted display device according to claim 13, wherein: 18. A monitor arranged in the central part in the front of the vehicle has a left and right sides of the display screen each of which is approximately 2 from the center in the left and right direction.
A car navigation system using a vehicle-mounted display device having a luminance distribution or a contrast distribution having an apex between 5 ° and approximately 35 °. 19. The brightness distribution or the contrast distribution has a brightness or contrast variation of 30% or more between the center of the horizontal direction of the display screen and about 40 ° to 60 ° on the left and right, with the apex as 100%. The car navigation system according to claim 18, wherein: 20. The car navigation system according to claim 19, wherein the brightness distribution or the contrast distribution has a brightness or a contrast of 50% or less at a horizontal angle of about 40 ° or more from the horizontal center of the display screen. . 21. As a monitor arranged in the center in the front of the vehicle, when the apex is taken as 100%, the brightness or contrast changes by 30% or more between the center of the display screen and the left and right sides at about 40 ° to about 60 °. A car navigation system using an in-vehicle display device having a brightness distribution or a contrast distribution that achieves 22. The car navigation system according to claim 21, wherein the brightness distribution or the contrast distribution has a vertex at the center of the display screen in the left-right direction. 23. The car navigation system according to claim 21, wherein in the brightness distribution or the contrast distribution, the brightness or the contrast is constant from the center of the display screen in the left-right direction to about 35 ° on the left and right sides. 24. The brightness distribution or the contrast distribution is about 40 ° from the center of the display screen in the left-right direction.
22. The car navigation system according to claim 21, wherein the brightness or the contrast sharply decreases to about 10% between about 60 degrees.