JP4556662B2 - Liquid crystal display device and vehicle-mounted navigation device using the liquid crystal display device - Google Patents

Description

The present invention relates to a liquid crystal display device and an in-vehicle navigation device using the liquid crystal display device, and in particular, when a rotary operation means is provided on the front surface, the arrangement portion of the rotary operation means is devised, The present invention relates to a liquid crystal display device in which an effective display area of a liquid crystal display panel is expanded without enlarging a so-called frame of the device within a predetermined standard, and an in-vehicle navigation device using the liquid crystal display device Is.

As a display device such as a computer, a personal digital assistant, a mobile phone, and a television device, a liquid crystal display device that is low in power consumption, thin, and lightweight has been increasingly used.

Among these display devices, the display device of the in-vehicle navigation device is particularly 1DI.
N size (length 50mm, width 178mm) or 2DIN size (length 100mm, width 17)
There is a particular demand for narrowing the frame as the effective display area of the liquid crystal display panel is enlarged while being arranged in a standardized small space (8 mm).

In addition, in the in-vehicle navigation devices other than these standardized sizes, there is a request similar to the above so that the device itself does not require an installation place as much as possible.

Liquid crystal display devices used in in-vehicle navigation devices are usually close to liquid crystal display panels, optical sheets such as diffusion sheets and prism sheets, light guide plates, reflection sheets, resin frames surrounding them, and side edges of the light guide plates A backlight source that houses them, a bottom plate that covers them and covers the back surface, a front frame that covers the periphery of the front surface of the liquid crystal display panel and the side surface of the assembly, and a gate driver IC and a so-called frame portion of the liquid crystal display panel Source driver IC is COG (Chip
On Glass) TA mounted directly or on resin film with foil electrode
It is provided by the B system and is driven by a control circuit board on which a control circuit connected to each of these driver ICs is mounted.

That is, the liquid crystal display device 10A used for the vehicle-mounted navigation device is, for example, FIG.
As shown in the exploded perspective view, the liquid crystal display panel 11 in which the gate driver IC 12a and the source driver IC 12b for driving the liquid crystal cell are directly mounted on the substrate by the COG method, and each driver IC is connected on one side of the liquid crystal display panel. A flexible printed wiring (FPC) board 13 for connection to a control circuit board (not shown) on which a controller and other electronic components for controlling each of these driver ICs are mounted; Three optical sheets 15a to 15c, a rectangular plate-shaped acrylic resin light guide plate 17,
A white reflecting plate 18 disposed on the back surface of the light guide plate and a bottom plate (case) 19 covering the back surface of the reflecting plate are combined, and these constituent members are placed on the resin frame 14 and the liquid crystal display panel 1 on the upper side of the frame.
1, and other components are fitted and housed on the lower side, and assembled by fitting the front frame 22 from the front surface of the liquid crystal display panel 11 so as to fit the bottom plate 19.

Then, around the light guide plate 17, an L-shaped or U-shaped tubular backlight light source 21 is disposed in a gap between the resin frame 14 and the reflection plate 18 along the side end surface thereof. The tubular backlight light source 21 is arranged so that the emission surface of the tubular backlight light source 21 is parallel to a side edge (side end surface) that is a light incident surface of the transparent light guide plate 17. The FPC 13 is guided to the back surface by turning the side surface of the resin frame 14 of the liquid crystal display panel 11, and is attached to a control circuit board (not shown) provided on the back surface of the reflection plate 18.

In the recent liquid crystal display device 10A having such a configuration, the effective display area of the liquid crystal display panel 11 is enlarged to narrow the so-called frame portion as much as possible. For example, as shown in Patent Document 1 below, In many cases, the wiring of the liquid crystal display panel is routed so that all electrode terminals are gathered on one side to enable mounting on one side.

On the other hand, as a means for a user of the in-vehicle navigation device to operate the device, a push button type switch is usually used because it can be operated in a relatively small space. However, the push button type switch has problems such as giving a low-level feeling to the user and making it difficult to perform delicate operations. There is also a demand to use a dynamic variable resistor and a changeover switch.

In this case, if only the push button type switch is used as in the conventional example, the operation panel can be grouped into a narrow area such as 1DIN size or 2DIN size relatively easily, but requires a rotating operation. When a rotary operation means such as a variable resistor or a rotary switch is installed, a certain size and depth are required to physically fix these rotary operation means. In addition, in the in-vehicle navigation device, the arrangement of these rotary operation means is a problem.

Such a rotary operation means is provided so as to be located outside the liquid crystal display panel 11 and the opposing light guide plate 17, but the liquid crystal display device 10 used in the in-vehicle navigation device.
A is required to narrow the front frame 22 to increase the effective display area of the liquid crystal display panel 11, and therefore, as shown in the plan view of FIG. 9 with the front frame removed, a rectangular liquid crystal is required. Except for the periphery 11a and 11b where the gate driver IC 12a and the source driver IC 12b are arranged on the display panel 11, the periphery 11c and 11d of the liquid crystal display panel is cut off with almost no margin between the periphery of the liquid crystal display panel. Arrangement has been made.

Thus, in the case where a U-shaped or L-shaped tubular backlight light source is used as the tubular backlight light source 21 in order to increase the luminance of the effective display area De of the liquid crystal display panel 11,
As shown in FIG. 10 which is a plan view of the rectangular light guide plate 17 with the liquid crystal display panel 11 and the optical sheets 15a to 15c removed, the gate driver IC 12a and the source of the liquid crystal display panel 11 are structurally viewed. The sides 17a and 17b facing the side where the driver IC 12b is present are the sides 17c and 17 where the gate driver IC 12a and the source driver IC 12b are not present.
Compared with d, there is a slight margin between the effective light emitting region Re of the light guide plate and the backlight source 21.

On the other hand, there is almost no space between the liquid crystal display device 10A and the outer periphery of the in-vehicle navigation device (not shown) due to the arrangement of CD or DVD slots. Therefore,
The rotary operation means and the other switch means are provided in the lower part of the in-vehicle navigation device so as to be located outside the liquid crystal display panel 11 and outside the opposing light guide plate 17.
It can be attached only up to the light guide plate and cannot be approached any further. Accordingly, since at least the mounting area of the rotary operation means cannot be reduced, the effective display area De of the liquid crystal display panel 11 is not enlarged and the frame portion is not narrowed, and the effective display area De is not reduced.
There is a problem that the rotation operation switch cannot be used if the frame is enlarged and the frame portion is narrowed.
Japanese Patent Laying-Open No. 2003-66474 (FIG. 4, [0046])

As described above, the in-vehicle navigation device is compact as a whole device, and the liquid crystal display device has a large effective display area, a so-called frame portion is narrow, a rotary operation means disposed on the front surface, and the like. There is a demand for a switch that occupies a small area. Further, it is necessary that the rotary operation means and the other switch means be securely and highly reliable.

The inventor of the present application has made various studies to solve the above-described problems. As a result, in the liquid crystal display device of the in-vehicle navigation device, by removing one corner that does not affect the effective display area of the liquid crystal display panel, It has been found that the arrangement of the dynamic operation means can be easily brought close to the vicinity of the effective display area of the liquid crystal display panel. That is, the inventor of the present application secures an effective display area of the liquid crystal display panel and pays attention to a margin part around the effective display area of the liquid crystal display panel as a part where the rotary operation means is arranged, The present inventors have found that the problems of the above-described conventional examples can be solved by effectively utilizing them, and have completed the present invention.

That is, a first object of the present invention is to provide a liquid crystal display device that can narrow the frame of the liquid crystal display panel and has a large effective display area of the liquid crystal display panel.

A second object of the present invention is to provide an in-vehicle navigation device in which the effective display area of a liquid crystal display panel is enlarged so that the arrangement and attachment of the rotary operation means can be made compact.

The first object of the present invention can be achieved by the following configuration. That is, the invention of the liquid crystal display device according to claim 1 includes a liquid crystal display panel, and a liquid crystal display provided with a gate driver IC connection portion and a source driver IC connection portion respectively provided in the adjacent periphery of the liquid crystal display panel. In the device, the side of the liquid crystal display panel provided with the gate driver IC connection portion and the side provided with the side provided with the source driver IC connection portion are cut off.

According to a second aspect of the present invention, there is provided a liquid crystal display device, a liquid crystal display panel, a gate driver IC connection portion and a source driver IC connection portion respectively provided in the adjacent periphery of the liquid crystal display panel, and a lower portion of the liquid crystal display panel. A light guide plate disposed in
In a liquid crystal display device comprising a backlight source disposed around the light guide plate,
The side of the liquid crystal display panel where the gate driver IC connection portion is provided and the side where the source driver IC connection portion is provided are cut off.

In the present invention, “cutting off the corner” means cutting out beyond the category of “chamfering” provided for preventing breakage of the corner.

The invention according to claim 3 is the liquid crystal display device according to claim 2, wherein the light guide plate is
The position corresponding to the cut corner portion of the liquid crystal display panel is cut away.

According to a fourth aspect of the present invention, in the liquid crystal display device according to the second aspect of the present invention, the light guide plate is formed with a ridge that covers the backlight light source between the backlight light source and the liquid crystal display panel. The backlight light source is also located at a cut corner portion of the liquid crystal display panel, and the wrinkles are cut off at the cut corner portion of the liquid crystal display panel.

The invention according to claim 5 is the liquid crystal display device according to any one of claims 1 to 4,
The gate driver IC and the source driver IC are directly mounted on the side of the liquid crystal display panel where the gate driver IC connection portion is provided and the side where the source driver IC connection portion is provided, on a resin film having a foil electrode. It is mounted or mounted on a control circuit board separate from the liquid crystal display panel.

According to a sixth aspect of the present invention, in the in-vehicle navigation device using the liquid crystal display device according to any one of the first to fifth aspects, the corner of the liquid crystal display panel is cut off at a portion where the corner of the liquid crystal display panel is cut off. The rotary operation means is disposed so as to be positioned.

The invention according to claim 7 is the in-vehicle navigation device according to claim 6, wherein the rotary operation means is a variable resistor or a changeover switch.

The present invention provides the following advantageous effects by having the above-described configuration. That is, according to the first or second aspect of the invention, a liquid crystal display using a liquid crystal display panel in which the connection portion of the gate driver IC and the connection portion of the source driver IC are provided on different sides of the liquid crystal display panel. In the device, the gate driver IC connection and the source driver I
Since the corner where two sides provided with the C connecting portion are adjacently connected is cut out, a space corresponding to the thickness of the liquid crystal display panel is formed in the cut out portion. Therefore, a portion that does not affect the effective display area and is occupied by a rectangular corner at a location where the side provided with the connection portion of the gate driver IC and the side provided with the connection portion of the source driver IC are adjacent to each other. Thus, the operating means can be arranged at the excision portion.

Further, according to the inventions according to claim 3 and claim 4, the light guide plate or the ridge portion located at the corner portion of the liquid crystal display panel that is cut out is essentially useless, so that this portion is cut out. As a result, a space corresponding to the thickness of the liquid crystal display device is generated, so that a space for arranging the rotary operation means requiring a larger installation place can be obtained.

According to the invention of claim 5, the gate driver IC and the source driver IC
Is mounted on a control circuit board separate from the liquid crystal display panel, whether it is a so-called COG system that is directly mounted on the frame portion of the liquid crystal display panel or a so-called TAB system that is mounted on a resin film having a foil-like electrode. It can also be applied to a system, and an appropriate system can be adopted according to the size of the liquid crystal display device.

According to the sixth aspect of the present invention, the connection portion of the gate driver IC and the connection portion of the source driver IC are provided on different sides of the liquid crystal display panel, and the two sides provided with these connection portions are Since a liquid crystal display device having a liquid crystal display panel with adjacent corners cut off was used, the portion occupied by the rectangular corners was cut away largely without affecting the effective display area of the liquid crystal display panel. Since the portion can be used effectively, the rotary operation means can be securely attached and arranged on the cut portion. Therefore, the frame of the liquid crystal display device can be narrowed without changing the effective display area of the liquid crystal display panel, and a compact on-vehicle navigation device as a whole can be obtained.

According to the invention of claim 7, since a variable resistor and a changeover switch can be used as the rotary operation means, it is possible to give a high-class feeling and to give a favorable feeling to the operator. An in-vehicle navigation device is obtained.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a liquid crystal display device according to the present invention and an in-vehicle navigation device using the liquid crystal display device will be described in detail with reference to the accompanying drawings.
Since the basic configuration is substantially the same as that of the conventional liquid crystal display device 10A shown in FIG. 8, the same reference numerals are given to the same components and the detailed description thereof is omitted. However, in the following embodiments, a liquid crystal display device using a liquid crystal display panel adopting a COG method as a mounting method of a gate driver IC and a source driver IC and a vehicle-mounted navigation device are embodied in order to embody the technical idea of the present invention. However, the present invention is not intended to be specified in this embodiment, and the present invention can be applied to various modifications without departing from the technical idea shown in the claims. It can be applied equally.

As a first embodiment, a specific example of the liquid crystal display device according to the present invention will be described with reference to FIGS. 1 is an exploded perspective view of the liquid crystal display device according to the first embodiment. FIG. 2 is a front plan view of the liquid crystal display panel with the front frame removed from the liquid crystal display device according to the first embodiment. FIG. 4 is a plan view of the liquid crystal display device 1 with a liquid crystal display panel and an optical sheet removed, and FIG.
FIG. 5 is an AA enlarged sectional view of FIG. 5, and FIG. 5 is a BB enlarged sectional view of FIG.

As is well known, the liquid crystal display panel 11 includes a cell substrate 11A provided with pixel electrodes, a counter substrate 11B, and a liquid crystal layer (not shown) held between the substrates via an alignment film, The cell substrate 11A and the counter substrate 11B are bonded together with a sealing material.
Further, as shown in FIG. 3, there is a U around the light guide plate 17 disposed below the liquid crystal display panel 11.
A backlight light source 21 such as a letter-shaped cold cathode tube is disposed, and the reflector 18 and the bottom plate 19 constitute a backlight.

The light guide plate 17 is made of a transparent resin plate or a transparent glass plate having high light transmittance such as acrylic resin, polycarbonate, AS, and PET. The light guide plate 17 is a substantially rectangular parallelepiped plate having an effective light emitting area Re slightly larger than the effective display area De of the liquid crystal display panel 11, and covers the backlight light source on the side facing the liquid crystal display panel in the periphery thereof.庇 23
Are provided to form a tubular backlight light source housing 24.

Further, an L-shaped tubular backlight light source extending over two sides or a U-shaped tubular backlight light source extending over three sides is disposed under the flange 23 on the side end surface of the tubular backlight light source storage unit 24. A cable 25 connected to is wired. The front surface of the light guide plate 17 is a light emitting surface, and a plurality of optical sheets 1 made of translucent polycarbonate or the like having a high light transmittance.
5a to 15c are provided to uniformly diffuse the light from the backlight light source 21.

Further, the back surface of the light guide plate 17 is subjected to dot-like processing, scratches or embossing by screen printing so as to diffusely reflect light. On the back surface side of the light guide plate 17, a reflective plate 18 in which a white polyester or a polyester film is provided with a silver vapor deposition film is disposed.

In this case, as shown in the plan view of FIG. 2 with the front frame removed, a rectangular liquid crystal display panel 11 is used.
In FIG. 5, the periphery 11 in which the gate driver IC 12a and the source driver IC 12b are arranged.
Except for a and 11b, the periphery 11c and 11d of the liquid crystal display panel are arranged in a cut-off manner with almost no margin between the periphery of the liquid crystal display panel. For this reason, the light guide plate 1
7 also has the same arrangement as that of the liquid crystal display panel 11. For example, as shown in FIG. 4 which is an AA enlarged sectional view of FIG. 2, the side 17b of the liquid crystal display panel 11 where the driver IC 12b is present is indicated by a dotted line. On the side 17d of the liquid crystal display panel 11 where the driver ICs 12a and 12b do not exist, there is a distance between the effective light emitting area Re of the light guide plate and the backlight source 21, but FIG.
As shown in FIG. 5, which is an enlarged cross-sectional view taken along the line B-B, there is almost no margin in distance between the effective light emitting region Re of the light guide plate and the backlight light source 21.

Therefore, in FIG. 3, the light guide plate 17 is shown in a state in which the portion of the flange 23 is seen through, but the flange 23 b of the tubular backlight light source storage portion 24 provided around the two sides 17 c and 17 d is formed in milky white. Accordingly, it is preferable to prevent the U-shaped backlight light source 21 from being visible from the surface at the sides 17c and 17d, since bright lines cannot be seen at these portions. On the other two sides 17a and 17b side, there is a margin between the effective light emitting region Re of the light guide plate and the backlight light source 21, so that the portion of the backlight light source 21 can be seen through the ridge 23 from the front. Even so, no bright line can be seen in this area.

The inside from the inner dotted line 17e is an effective light emitting area Re of the light guide plate 17 facing the effective display area De of the liquid crystal display panel. Further, a connector 26 for external connection is connected to the backlight light source 21 via a cable 25. Both ends of the tubular backlight light source 21 and important points along the way are held by a lamp holder 27.

In the liquid crystal display device 10 of the first embodiment, as shown in FIG. 2, as the liquid crystal display panel 11, the gate driver IC 12a and the source driver IC 12b are arranged and mounted directly on different sides 11a and 11b of the cell substrate 11A. Something is used. This liquid crystal display panel 1
1 denotes a gate driver I connected to electrode terminals of scanning lines and signal lines formed on the cell substrate 11A.
The C12a and the source driver IC 12b are connected by a COG method using a one-way conductive adhesive, and are mounted on different sides 11a and 11b of the cell substrate 11A.

As shown in FIG. 2, the liquid crystal display panel 11 of the first embodiment has a gate driver IC.
12 a and a corner driver 11 f on which the source driver IC 12 b is mounted are provided with a corner cut portion 11 f adjacent to and connected to each other.

The cut portion 11f of the liquid crystal display panel is typically a triangle, that is, a cut piece, and the shape thereof is a triangle. However, it can be cut into a suitable shape as needed, such as a cut quarter, square, or sector.

According to such a configuration, the cut portion 11f is provided at the rectangular corner that forms the outline without affecting the effective display area De of the liquid crystal display panel 11. Therefore, the thickness of the liquid crystal display panel 11 is set at the cut portion 11f. A corresponding space is created. Therefore, various operation means can be arranged in the cut portion 11f, and if a rotary operation means such as a variable resistor or a rotary switch is arranged, an area invalid for display is narrowed, and this space is reduced. Since the frame can be narrowed without changing the effective display area De of the liquid crystal display panel 11, it is possible to provide a liquid crystal display device that is particularly useful as a display device for a vehicle-mounted navigation device.

In this case, the cut portion 17f can also be provided in the light guide plate 17 at a portion facing the cut portion 11f at the corner of the liquid crystal display panel 11. In particular, in the embodiment, in order not to impair the effective light emitting region Re at the corner of the light guide plate 17, the collar 23 covering the backlight light source is
A cut portion 17f is formed by cutting to the limit of the bent portion of the backlight light source 21.

In this way, by providing the cut portions 17f also on the light guide plate 17 at the portions facing the cut portions 11f at the corners of the liquid crystal display panel 11, the cut portions 11f and 17f correspond to the thickness of the liquid crystal display device 10. Since a space is generated, it becomes possible to arrange a rotary operation means such as a variable resistor or a rotary switch having a high quality thickness in this space, and therefore, as a display device for a high quality in-vehicle navigation device A useful liquid crystal display device is obtained. It should be noted that it is not necessary to scrape until the ridge 23 is completely removed, and it is only necessary to scrape it corresponding to the cut portion 11f of the liquid crystal display panel 11.

In the above, the corner cuts of the liquid crystal display panel 11 and the light guide plate 17 have been described. Of course, along with these cuts, the optical sheets 15a to 15c such as a diffusion sheet and a prism sheet, the reflector 18 and the bottom plate 19 and the like. It goes without saying that the portions corresponding to those corners are similarly cut off.

As a second embodiment, a specific example of the in-vehicle navigation device according to the present invention using the liquid crystal display device manufactured in the first embodiment will be described with reference to FIGS. 6 is a front perspective view of the in-vehicle navigation device of the second embodiment, and FIG. 7 is a rear perspective view of the in-vehicle navigation device of FIG.

The in-vehicle navigation device 40 shown in FIGS. 6 and 7 is a liquid crystal display device according to the first embodiment.
The liquid crystal display device 10 having the liquid crystal display panel 11 and the light guide plate 17 with the corresponding corners cut away is used. The in-vehicle navigation device 40 has a liquid crystal display panel 11 on the front surface, a data input CD or DVD slot 42 on the top of the case 41, and various operations on at least one side of the liquid crystal display panel 11. A plurality of push button switches 43 are provided, and an operation dial 44 ′ of the rotary operation means 44 is provided below the push button switches. Specific examples of the rotary operation means 44 include those for adjusting the volume, those for adjusting the frequency, and those for switching the display screen.

On the back side, FPC boards 13a and 13b are led to the back side of the liquid crystal display device 10 and attached to the back side of the bottom plate 19, and are connected to an external control circuit board via a connector (not shown).

In this case, the liquid crystal display device 10 is fixed to the case 41 with four fixing brackets 45. The rotary operation means 44 of the in-vehicle navigation device 10 is provided at the cut-out portion 11f at the corner where the two sides of the liquid crystal display panel 11 in which the gate driver IC and the source driver IC are arranged and mounted on different sides are connected to each other. The vehicle-mounted navigation device is made compact as a whole, and the area occupied by the frame portion of the liquid crystal display panel 11 can be reduced without changing the effective display area De of the liquid crystal display panel 11.

It should be noted that the shape of the cut portion can be designed as appropriate regardless of the above embodiment. In addition, a liquid crystal display device in which a liquid crystal display panel with a corner cut off and a rectangular light guide plate are combined may have another shape instead of a rectangular shape.

Although the liquid crystal display device 11 has been described above as an example in which the liquid crystal display panel 11 has the gate driver IC 12a and the source driver IC 12b mounted on the cell substrate on different sides by COG, the driver IC is on one side. In the case of a concentrated liquid crystal display panel, the desired effect is difficult to obtain because the amount of excision of the liquid crystal display panel is small.

1 is an exploded perspective view of a liquid crystal display device of Example 1. FIG. 3 is a front plan view of a liquid crystal display panel with a front frame removed in the liquid crystal display device of Example 1. FIG. FIG. 3 is a plan view of the liquid crystal display device of Example 1 with a liquid crystal display panel and an optical sheet removed. It is an AA expanded sectional view of FIG. It is BB expanded sectional drawing of FIG. It is a front perspective view of the vehicle-mounted car navigation apparatus of Example 2. FIG. It is a back perspective view of the vehicle-mounted car navigation apparatus of Example 2. FIG. It is a disassembled perspective view of the conventional liquid crystal display device. It is a front top view of the liquid crystal display panel which removed the front frame in the conventional liquid crystal display device. It is a top view of the state which removed the liquid crystal display panel and the optical sheet in the conventional liquid crystal display device.

Explanation of symbols

10, 10A Liquid crystal display device 11 Liquid crystal display panel 11f Liquid crystal display panel cutting part 12a, 12b Driver IC
13a, 13b Flexible printed circuit board 14 Resin frame
15a to 15c Optical sheet 17 Light guide plate 17f Light guide plate excision part 18 Reflection plate 19 Bottom plate 21 Tubular backlight light source 22 Front frame 23 バ ッ ク 24 Tubular backlight light source storage part 40 In-vehicle car navigation device 43 Push button switch 44 Rotating operation means

Claims (6)

A liquid crystal display panel;
A gate driver IC connection portion provided on any one of the plurality of sides of the liquid crystal display panel; a source driver IC connection portion provided on a side different from any of the sides ;
A light guide plate disposed below the liquid crystal display panel;
A backlight source disposed around the light guide plate;
In a liquid crystal display device comprising:
While cutting off the corner where two sides of the liquid crystal display panel, the side where the gate driver IC connection portion is provided and the side where the source driver IC connection portion is provided, are adjacent and connected ,
The liquid crystal display device , wherein a position corresponding to the cut corner portion is cut in the light guide plate . On the light guide plate, a ridge that covers the backlight light source is formed between the backlight light source and the liquid crystal display panel,
The backlight light source is also located at the corner of the liquid crystal display panel that has been cut away,
In the portion of the resected angle of the liquid crystal display panel, a liquid crystal display device according to claim 1, wherein the eaves is cut. Portion of the excised corners of the liquid crystal display panel, according to claim 1 or 2, wherein the comparing the breakage prevention portion of the angle resection C chamfering or R-chamfering to be performed on the purpose, there are many ablation amount Liquid crystal display device. The gate driver IC and the source driver IC are directly mounted on the side of the liquid crystal display panel where the gate driver IC connection portion is provided and the side where the source driver IC connection portion is provided, and on a resin film having a foil electrode. implementation, or a liquid crystal display device according to any one of claims 1 to 3, characterized in that the liquid crystal display panel is mounted on the control circuit board separate. In-vehicle navigation device that used the liquid crystal display device according to claim 1, any one of 4, in the portion formed by cutting the corner of the liquid crystal display panel was disposed revolvable operation unit of the navigation device An in-vehicle navigation device characterized by the above. 6. The in-vehicle navigation device according to claim 5 , wherein the rotary operation means is a variable resistor or a changeover switch.

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