CN100529891C - Liquid crystal display device - Google Patents

Abstract

It is an object of the present invention to obtain a liquid crystal display device in which lead wiring is easy, size and thickness can be reduced, and connector connection is easy. The lighting unit for illuminating the liquid crystal display panel (2) is provided with a substantially wedge-shaped light guide plate (5), a linear light source (4) arranged along the plate thickness surface of one side end of the light guide plate (5), and the linear light source ( 4) the lead wire (44) that two ends connect and the frame (7) that collects these parts. The above-mentioned lead wire (44) is stored in the concave groove (72b) of the bottom wall of the above-mentioned frame (7) along the other side end of the light guide plate (5), and is led out from the back side of the above-mentioned frame (7). A guide member for guiding the connection of the connector is formed on the circuit board (11) for driving the liquid crystal display panel. The liquid crystal display device of the present invention can be used not only as a driving navigation device, but also as a display device for home appliances such as a rice cooker.

Description

Liquid crystal display device

technical field

The present invention relates to a liquid crystal display device, and more specifically, to a liquid crystal display device having a chassis covering the back of a display unit and a circuit board provided on the back of the chassis.

Background technique

Compared with other display devices, liquid crystal display devices can be used as display devices for mobile phones, personal computers, driving navigation, televisions, and various OA equipment due to their low power consumption, light weight, and space-saving characteristics.

On the other hand, since the multi-function, high-performance, convenience, and low-cost of these various devices are progressing year by year, following this progress, the display device is also required to further improve high-quality, low-power consumption, and Space saving and cost reduction etc. For example, when a liquid crystal display device used in a 1DIN (height 50 mm x width 178 mm) type car navigation device is mounted on various vehicles, its installation space is limited, and installation work is required in addition to the above-mentioned thinness and miniaturization. The ease of and prevent the intrusion of dust and so on.

In order to realize a bright display screen, these liquid crystal display devices generally include an illumination unit having various light sources, and the illumination unit irradiates light from the back of the liquid crystal display panel. Moreover, this lighting unit is roughly divided into two different types according to the installation position of the light source, one is an edge-light type in which a linear light source is arranged along the side end surface of the light guide plate, and the other is a direct type in which a light source is arranged on the back of the light guide plate. Among them, the edge-light type is mostly used as a device that gives priority to thinness due to its thinness and excellent uniformity of brightness on the light-emitting surface. Since the direct type can be equipped with a large light source, it is used in equipment requiring high brightness.

However, in recent years, such liquid crystal display devices have been further developed toward smaller size, thinner shape, and lighter weight. Along with these, the backlight is also required to be further smaller and thinner. The miniaturization and thinning are achieved by making the various components that constitute the backlight, such as the light source, light guide plate, and frame, small, thin, and lightweight. way to complete.

For example, Japanese Patent Laid-Open No. 2001-249621 introduces a lighting unit in which the lead wires connected to the light source are effectively stored in the frame.

The structure of this lighting unit UT, as shown in FIG. The lead wire 103 connected to the light source 102 is sandwiched between the side surface of the light guide plate 101 and the frame 104, and the lead wire 103 is pressed by a plurality of protrusions K so that it does not come off from the frame.

However, in this lighting unit, since a gap is provided between the side of the light guide plate and the frame, and the lead wires are stored in the gap, the frame must enlarge the storage space, and as a result, the display device is also enlarged. .

For example, Japanese Patent Laid-Open No. 2002-150823 also discloses a miniaturized backlight device that does not use sheet wiring for electric wires connected to light.

The backlight device 110, as shown in Figure 9, has a light guide plate 111 with a side end surface as the incident surface, a linear light source 112 arranged laterally along the side end surface of the light incident surface, and a longitudinal side connected to the linear light source 112. The lead wire 113 is extended to the other longitudinal end side of the linear light source 112 . Furthermore, the light guide plate 111 has an inclined back surface whose plate thickness becomes thinner as it gets away from the light incident surface, and is arranged such that the space below the back surface of the light guide plate becomes larger as the plate thickness becomes thinner. The above-mentioned lead wires 113 pass to the back side of the above-mentioned light guide plate 110 with a gap T left from the light-incident surface, and are set to the other end side of the longitudinal direction of the above-mentioned linear light source 112, and are located at the side that becomes larger as the light guide plate becomes thinner. In the space below the light guide plate, a part of the lead wire 113 is arranged above the lower edge of the side end surface of the light guide plate as the light incident surface.

However, even with such a wiring configuration, since the lead wires are wired on the lower side of the lower frame with a space T left from the incident surface, the thickness of the display device becomes thicker. If it is desired to make it thinner, there is a problem of limiting the size of the lead.

Such a liquid crystal display device is provided with a connector for receiving an image signal. This connector is often installed on the back of the liquid crystal display panel, and various problems arise depending on its position.

For example, Japanese Patent Application Laid-Open No. 2002-351349 discloses a liquid crystal display device capable of easily checking the connection state of a connector. Specifically, the liquid crystal unit and the backlight are stored on the frame, the upper side of the liquid crystal unit is covered with the front fluorescent screen cover (outer frame), the lower side is covered with the rear fluorescent screen cover, and the fluorescent screen is placed on the back of the connector corresponding to the control circuit board. A confirmation hole is opened at the position of the cover. As a result, the connection state of the connector can be easily confirmed through the confirmation hole.

However, when the liquid crystal display device described in JP-A-2002-351349 is used for an application that requires thinning, such as a car navigation device, the connection to the connector provided on the back of the liquid crystal display device is difficult due to the The wiring from the control panel on the side is connected to the connector of the liquid crystal display device, and the connector is not visible, so the operability is very poor. Therefore, breakage and poor connection of the connector frequently occur.

Contents of the invention

Therefore, the present invention was developed to solve the problems of the prior art, and an object of the present invention is to provide a liquid crystal display device in which the wiring of leads is easy and the size and thickness can be reduced.

It is an object of the present invention to further provide a liquid crystal display device that is easily connected to a connector while achieving the above object.

The above objects of the present invention can be achieved by the following constitutions. That is, the liquid crystal display device of the present invention has a liquid crystal display panel and an illumination unit for illuminating the liquid crystal display panel, wherein the illumination unit has a substantially flat surface with a back surface whose plate thickness becomes thinner from one side end to the other side end. A wedge-shaped light guide plate, a linear light source arranged along the plate thickness surface of one side of the above-mentioned light guide plate, lead wires connected to both ends of the above-mentioned linear light source and a frame for storing these parts, on the plate of the above-mentioned light guide plate The thinnest part forms a groove on the bottom wall of the frame so that a gap is formed between the back surface of the light guide plate, and a part of the lead wire is wired along the other side end of the light guide plate in the gap, And export from the back side of the above rack to the outside.

If this structure is used, since the light guide plate is made into a wedge shape, because the lead wires of the linear light source are wired at the bottom of the thin part of the plate, it is not necessary to change the space for arranging the lead wires between the frame and the light guide plate, thereby providing a Smaller and thinner liquid crystal display devices.

The liquid crystal display device of the present invention is characterized in that a part of the lead wire is housed in a groove formed on the bottom wall of the frame, and is led out of the frame through the groove; still another feature is that the light guide plate, A reflection plate is arranged on the back surface thereof, and the reflection plate has a bent portion bent in a substantially U-shape at one end, and the linear light source and the thick end edge of the light guide plate are inserted into the bent portion.

If this structure is used, the lead wires are fixed with the above-mentioned grooves, and the lead wires do not interfere when the liquid crystal display device is assembled, and the U-shaped reflector is formed, so the linear light source and the light guide plate can be supported, so the assembly of the linear light source and the light guide plate is also easy. Therefore, assembly of the liquid crystal display device can be performed more easily.

A liquid crystal display device according to the present invention is characterized in that a circuit board on which circuit elements and connectors for driving the liquid crystal display panel are mounted is mounted on the rear surface of the chassis in parallel with the liquid crystal display panel.

The liquid crystal display device of the present invention is characterized in that a guide member for guiding the connection of the main body side connector to the above-mentioned connector is formed on the back of the above-mentioned frame; another feature is that the above-mentioned circuit board is fixed in a high table type (high bed type) , the above-mentioned guide member has a slope extending toward the long side surface facing the above-mentioned connection port; another feature is that the above-mentioned guide member is a resin member integrally formed with the above-mentioned frame.

If this structure is used, since the circuit board and the above-mentioned liquid crystal display panel are installed in parallel, and a guide member that guides a part of the connector on the main body side to the connector is provided on the back of the above-mentioned frame, it is possible to provide a position that limits the space. A liquid crystal display device that can be easily installed even at the time of installation.

Description of drawings

Fig. 1 is a front view showing an embodiment of the present invention.

2 is a partial sectional view of FIG. 1, FIG. 2(A) is a sectional view of A-A of FIG. 1, and FIG. 2(B) is a sectional view of B-B of FIG. 1.

FIG. 3 is an exploded perspective view of FIG. 1 .

FIG. 4 is an enlarged perspective view in which some parts of FIG. 3 are extracted and enlarged.

Fig. 5 is a rear perspective view showing another embodiment of the present invention.

FIG. 6 is an exploded perspective view of FIG. 5 .

Fig. 7 is a sectional view along A-A of Fig. 5 .

Fig. 8 shows a conventional lighting unit, in which (A) is a cross-sectional view and (B) is a plan view.

Fig. 9 shows a conventional backlight device, in which (A) is a sectional view and (B) is a plan view.

Detailed ways

An embodiment of the present invention will be described with reference to FIGS. 1 to 4 .

Liquid crystal display device 1, as shown in Fig. 1～Fig. sheet 3, reflective plate 6 disposed on the back of light guide plate 5, frame 7 for housing these lamp assemblies 4, light guide plate 5, and reflective plate 6, and outer surfaces such as liquid crystal display panels surrounding the outer periphery of the frame 7 are fixed. The frame 9, the circuit board 11 installed on the back of the frame 7, the insulating sheet 12, and the protective cover 8 covering the circuit board 11 and the insulating sheet 12 are constituted.

The lighting unit is composed of an optical sheet 3, a lamp assembly 4, a light guide plate 5, a reflection plate 6, and the like. Circuit elements for driving the liquid crystal display panel 2 and connectors to external devices are mounted on the back of the circuit board 11 , and the circuit board 11 is fixed to the back of the chassis 7 substantially parallel to the liquid crystal display panel 2 .

This liquid crystal display device 1 is suitable as a display device for driving navigation, and its size is 1 DIN size, and its display screen is, for example, 4.9 inches.

The light guide plate 5, as shown in FIGS. 2 and 3, is composed of a rectangular plate having substantially the same width and width as the liquid crystal display panel 2, and is formed of acrylic resin or the like. Its plate thickness, in the direction perpendicular to its longitudinal direction, as shown in the cross-sectional view of FIG. shape. The plate thickness of the one end side 53 is formed to be substantially the same thickness as the diameter of the linear light source 41 described above. One end side 53 of the light guide plate 5 is a light incident surface, and the surface 51 is a light emitting surface.

The optical sheet 3 is comprised from the laminated body of the light-diffusion sheet 3c of 1 sheet, and the several lens sheet 3a, 3b laminated|stacked on this light-diffusion sheet 3c. The light diffusion sheet 3c and the lens sheets 3a, 3b are formed of a non-conductive material. The optical sheet 3 is fixed with the middle frame 10 when stored in the frame 7 .

Reflector 6 reflects light incident on light incident surface 53 of light guide plate 5 and emits light from surface 51 . Its shape is such that the flat surface 61 is approximately the same size as the light guide plate 5, inclined along the back surface 52 of the light guide plate 5, and bent in a U-shape at one end side in the longitudinal direction to form a curved portion 62, and formed inside the curved portion 62. The above-mentioned linear light source 41 is housed in the curved portion 62 through a gap.

By accommodating the linear light source 41 in the bent portion 62, noise generated from the linear light source 41 can be blocked. The other side end 64 is bent approximately 90° from the flat surface 61 to form an engaging piece 65 that engages with the other side end 54 of the light guide plate 5 .

As shown in FIG. 4 , the lamp unit 4 is composed of a linear light source 41 and lead wires 43 and 44 (hereinafter referred to as first and second lead wires 43 and 44 ) connected to the linear light source 41 . The linear light source 41 uses a narrow fluorescent lamp such as a cold cathode tube or a hot cathode tube, and is lit by a high-frequency AC power supply. The fluorescent lamp is preferably linear, but it is not limited thereto, and L-shaped or U-shaped ones may be used. Lamp sockets 42a, 42b are attached to both ends of the fluorescent lamp 41, and first and second lead wires 43, 44 are led out from these sockets 42a, 42b. Both the first and second lead wires 43 and 44 have an approximately circular or elliptical cross-section, and their diameter is approximately 1.0 to 1.2 mm. The lead wires are not limited to these, and flat-type ones may also be used. The cross-sectional shape of the sockets 42a and 42b may also be circular.

The above-mentioned first and second lead wires 43 and 44 are bent into predetermined shapes when stored in the frame 7 . That is, the first lead wire 43 consists of a short side portion 43a drawn out from the lamp holder 42a and along the short side of the light guide plate 5, a long side portion 43b along the long side of the light guide plate 5, and a direction from the middle of the long side portion toward the back side. The bending portion 43c is formed by bending and leading out of the frame 7 . The second lead wire 44 is led out from the lamp holder 42a and is led out to the chassis 7 by bending along the short side part 44a along the short side of the light guide plate 5, the long side part 43b along the long side, and the middle of the long side part toward the back side. The outer bend 44c forms. An electrical connector 45 is connected to the ends of the first and second lead wires 43 and 44 .

The first and second lead wires 43 and 44 can be led out to the outside by bending toward the back side of the frame 7 at the bending portions 43c and 44c. This is because it is led out to the back of the rack in order to improve the operability when installing the liquid crystal display device. The opening 73d of the frame 7 is provided at a position closer to one side from the center of the long side 71, so the first lead 43 is formed to be shorter than the second lead 44, but at this time, it is preferable to make a linear The high-voltage side of the light source 41 is connected to the first lead 43 , and the low-voltage side is connected to the second lead 44 .

The short side portions 43a, 44a are respectively provided with bent portions 43a', 44a' at a part thereof, meandering forward, and fitted into thin plate-shaped protrusion pieces 72c', 72d' formed in the frame 7. Since the bent parts 43c', 44c' are provided, even if the lead wire is stretched during wiring, the lead wire is supported by these bent parts, so the force can be dispersed in the bent part, and the force is difficult to be directly transmitted to the lamp holders 42a, 42b.

The frame 7 is formed in a shallow box shape with an open top, has a bottom wall 70 and an outer peripheral wall 71 erected at a predetermined height from the outer periphery of the bottom wall 70, and is formed of a synthetic resin material. The outer peripheral wall 71 is composed of long-side side walls 71a, 71b and short-side side walls 71c, 71d, and the side walls are integrated at corners. Openings 73a, 73b are formed in the facing side walls 71c, 71d, and the ground wires 13a, 13b and the ground wire terminals 63a, 63b are inserted into these openings (see FIG. 3 , the ground wire terminal 63b is omitted in this figure). An opening 73d is formed in the side wall 71b, and the first and second lead wires 43 and 44 are led out of the chassis 7 from the opening 73d.

The bottom wall 70 is formed with an inclined surface conforming to the shape of the light guide plate 5 . By providing the inclined surface, when the light guide plate 5 and the reflector 6 are placed on the inclined surface, the flat surface 61 of the reflector 6 formed along the back surface 52 of the light guide plate 5 abuts against the inclined surface, so that it can be stably fixed. Light guide plate 5 and reflector plate 6.

Recessed grooves 72a, 72b are formed on the bottom wall 70 to be close to the inner peripheral wall surfaces of the respective long side walls 71a, 71b. Among these concave grooves, one concave groove 72a is wide enough to house the U-shaped portion 62 of the reflector 6, and the other concave groove 72b is wide enough to house the first and second lead wires 43 and 44. Instead of the concave groove, a protruding piece (not shown) protruding from the bottom wall may be provided, and a space of a predetermined width may be formed between the protruding piece and the inner peripheral wall surface. Thin plate-shaped protrusions 72c', 72d' are erected at a predetermined distance from the inner wall surface of the short side to form spaces 72c, 72d for accommodating the first and second lead wires 43, 44. Furthermore, a plurality of openings 70a to 70b having a predetermined size are formed in the bottom wall 70 except for the portion near the inner peripheral end.

In the concave groove 72b, hill-shaped protrusions (not shown) are formed on both rib sides of the opening 73d. Therefore, it is possible to prevent dust from entering the groove 72b from the opening 73d. The hill-shaped convex portion protrudes upward from the bottom of the concave groove 72b, and the concave groove is formed so as to leave a space through which the lead wire can pass, and then partially closes it.

These parts are assembled using the following procedure. First, the lamp unit 4 is assembled. As shown in FIG. 4 , lamp sockets 42 a and 42 b are attached to both ends of a fluorescent lamp 41 to lead out first and second lead wires 43 and 44 . Next, the first lead wire 43 is bent from one end of the socket 42a along the short side 43a of the short side of the light guide plate 5, along the long side 43b of the long side, and from the middle 43c of the long side to the outside. The second lead wire 44 is bent so as to be led out from the socket 42b along the short side portion 44a along the short side of the light guide plate 5, the long side portion 44b along the long side, and the midway 44c of the long side portion. Next, an electrical connector 45 is connected to the ends of the first and second lead wires 43 and 44 . In addition, the bending of the first and second lead wires 43 and 44 may be performed at the time of attachment to the frame 7 .

The lamp unit 4 is assembled as described above, and the fluorescent lamp 41 is inserted into the U-shaped bent portion 62 of the reflector 6 . Next, the light guide plate 5 is inserted into the bent portion 62 from the one end 53 (thick side), and the other end 54 (thinner side) is engaged with the engaging piece 65 of the reflector 6 .

Next, the reflection plate 6 to which the light guide plate 5 has been mounted is mounted on the frame 7 . In this attachment, first, the reflector 6 is inclined and the curved portion 62 is fitted into the concave groove 72a, and at the same time, the sockets 42a and 42b of the fluorescent lamp 41 are fitted into and fixed in the groove 72a. Next, the bent portions 43a, 43b of the first lead 43 are inserted into the space 72d and the concave groove 72b. Near the opening 73d, since an opening is also formed on the bottom surface of the concave groove, the lead wire 43 is arranged at the opening of the concave groove 72b through the opening 73d, and is led out from the back side of the frame 7. The bent parts 44a and 44b of the second lead wire 44 are also inserted into the space 72c and the concave groove 72b, and are led out from the back side of the frame 7 through the opening 73d disposed on the bottom of the concave groove 72b. Thereafter, the reflector 6 is laid down from the inclined state, and the engaging piece 65 of the reflector 6 is pressed against the inner wall surface of the long side wall 71b, and the reflector 6 is housed in the frame 7 . At this time, the ground terminals 63 a and 63 b of the reflector 6 are inserted into the openings 73 a and 73 b of the chassis 7 .

However, after the lead wires 43 and 44 are fitted in the concave groove 72b, the concave groove 72b can be covered with a tape 75 as shown in FIG. 4 . Since it is covered with the tape 75, the lead wires can be suppressed from flying out in the subsequent assembly process. It is also possible to prevent dust entering through the opening 73b from entering through the gap between the reflection plate 6 and the chassis 7 . However, in the lighting unit of the prior art as shown in FIG. 8, since the thin wall for fixing the light guide plate between the light guide plate 101 and the lead wire 103 is formed, although dust can be prevented from entering the light guide plate side, as in this embodiment, If the lead wires are arranged under the light guide plate 5, the possibility of dust intruding into the light guide plate 5 from the gap between the reflector 6 and the frame 7 becomes very high, so it is very effective to cover the groove 72b with the tape 75 as a way to prevent the intrusion of dust. . Specifically, PET is preferable as the tape 75 because it has moderate elasticity and is easy to handle compared with an aluminum tape.

Through this assembly, a gap _L2 is formed between the flat surface 61 of the reflection plate 6 and the bottom surface of the frame 7, and the first and second lead wires 43, 44 should be arranged in the concave grooves provided at the most open part of the gap. 72b. Furthermore, since the concave groove 72b is covered by the outer bottom surface of the other end 64 of the reflector 6, the leads 43, 44 are pressed by the bottom surface of the reflector 6 and do not protrude from the concave groove 72b.

The first and second lead wires 43 and 44 are located substantially directly under the other end 54 of the light guide plate 5, and as shown in _FIG . Since the lead wire is arranged at the maximum width of the gap, the size of the lead wire can be selected in accordance with the maximum width.

Thereafter, the optical sheet 3 and the liquid crystal display panel 2 are placed on the surface 51 of the light guide plate 5 , and the periphery of the assembly is surrounded and fixed with the outer frame 9 . On the other hand, a circuit board 11 connected to the liquid crystal display panel 2 is disposed on the back of the chassis 7, and a protective cover 8 for protecting the circuit board 11 is attached to the bottom surface to complete the liquid crystal display device.

Next, other embodiments of the present invention will be described with reference to FIGS. 5 to 7 .

As shown in Figures 5 and 6, the liquid crystal display device 1A is stacked in sequence with a metal outer frame 9, a liquid crystal display panel 2 for display, a middle frame 10 such as a fixing sheet, a plurality of optical sheets 3, and a wedge-shaped guide in cross section. Light board 5, backlight 4 composed of fluorescent tubes as light sources or reflectors or wiring 43, 44 for fluorescent tubes, frame 7 fitted with outer frame, circuit board 11 for controlling liquid crystal display panel 2, insulating sheet 12 , Covering the protective cover 8 of the circuit board 11 or the insulating sheet 12 . Also, these parts are fixed with small screws 8a, 8b.

Incidentally, since this liquid crystal display device 1A has the same shape as the above-mentioned embodiment except for the shape of the chassis 7, a detailed description of the shape will be omitted here.

Frame 7 forms the bottom shallow box shape of top opening, is provided with the protruding sheet of positioning fixed circuit board 11 on the back side, is formed with synthetic resin material. The circuit board 11 is mounted on the rear surface approximately parallel to the liquid crystal display panel 2 .

On the portion of the circuit board 11 where the protective cover 8 does not overlap, a circuit board-side connector 11 a for receiving image signals and the like sent from the outside of the liquid crystal display panel 2 is arranged. The connection port of the circuit board side connector 11 a is provided near the edge of the circuit board 11 . The connection port of the circuit board-side connector 11a is provided in a direction in which the body-side connector (not shown) and the circuit board 11 on the flat plate are mated in parallel to the plane of the plane. That is, the connection port of the circuit board side connector 11 a is parallel to the circuit board 11 .

The body-side connector is a connector provided in a car navigation device or the like incorporating the liquid crystal display device 1A, through which a signal for an image is sent to the circuit board-side connector 11a.

On the frame 7 on the connection port side of the circuit board side connector 11a, there is formed a protruding guide rail 7a that assists when connecting the main body side connector to the circuit board side connector 11a. The guide rail 7a is a resin integrally formed with the frame 7, and has a flat surface 7b extending toward the long side of the connection port of the circuit board side connector 11a, and a flat surface 7b extending toward the circuit board side connector 11a on the left and right short sides. The short side of the connection port is an elongated flat surface 7c (see FIG. 7 ). At the time of connection, the side surface of the main body side connector is connected to the circuit board side connector 11a while following the surfaces 7b and 7c.

In this way, since the guide rail 7a is integrally formed, the manufacturing process is not increased, and the cost remains unchanged. Since the plane 7b of the guide rail 7a is facing the long side of the connection port of the circuit board side connector, the positioning of the main body side connector is completed in the direction perpendicular to the long side of the connection port, because the plane 7c of the guide rail 7a is facing the side of the circuit board side connector. The short side of the connection port completes the positioning of the main body side connector in a direction perpendicular to the short side of the connection port. Therefore, even without looking at the board-side connector 11a, the main body-side connector can be reliably and easily connected, and damage and poor connection of the connector can be prevented. Such a configuration is very effective especially when the circuit board 11 is fixed in a high table type.

In addition, the planes 7b and 7c do not necessarily have to be planes, and it does not matter if they are slowly curved surfaces extending toward the connection port. The plane 7c that is positioned at the short side of the connection port does not necessarily have the same height as the short side near the connection port, if it has the function as a guide rail, its height can be set arbitrarily.

In this embodiment, as shown in FIG. 7, the cross section of the guide rail 7a is substantially trapezoidal, and an inclined surface 7d is formed from the bottom of the frame 7 to the end of the plane 7b. Therefore, since the main body side connector can be connected to the inclined surface 7d and along the plane 7b when the connector is connected, the circuit board 11 is fixed at a position higher than the bottom of the frame 7, even if the circuit board side cannot be seen. Even when the connector 11a is very difficult to see, the main body side connector can be reliably and easily connected.

In FIG. 7 , the guide rail 7a is composed of 7b to 7d, and the plane 7c functions as a guide rail if it is provided at least at one end of the surface 7b.

This liquid crystal display device can be effectively used for devices connected when the connector provided on the back is not visible, for example, it can also be used as a display device for home appliances such as a rice cooker including a car navigation device.

Claims (6)

1. a liquid crystal indicator has display panels and the lighting unit that shines above-mentioned display panels, it is characterized in that,

Above-mentioned lighting unit possesses and has linear light source, lead-in wire that is connected with the two ends of above-mentioned linear light source respectively that thickness of slab sets from the light guide plate of the approximate wedge shape shape at the back side that a side tilts to another side attenuation ground, along the plate thickness surface of a side of above-mentioned light guide plate and the frame of collecting these parts

In the thinnest part of the thickness of slab of above-mentioned light guide plate, with and the back side of above-mentioned light guide plate between produce the mode in gap, form ditch at above-mentioned frame diapire, the part of above-mentioned lead-in wire in above-mentioned gap along another side distribution of above-mentioned light guide plate, derive to the outside from the rear side of above-mentioned frame

At the back side of above-mentioned frame, with above-mentioned display panels circuit board is installed abreast, this circuit board is equipped with circuit component and the connector that drives above-mentioned display panels.

2. as the liquid crystal indicator of claim 1 record, it is characterized in that the part of above-mentioned lead-in wire is concealed in the ditch of the diapire formation of above-mentioned frame, derives to the outside of above-mentioned frame by above-mentioned ditch.

3. as the liquid crystal indicator of claim 1 record, it is characterized in that, the back side in above-mentioned light guide plate is equipped with reflecting plate, and an end of said reflection plate has the bend that general curved becomes コ word shape, is inserted with the thickness of slab ora terminalis of above-mentioned linear light source and above-mentioned light guide plate in above-mentioned bend.

4. as the liquid crystal indicator of claim 1 record, it is characterized in that, be formed with the guiding elements of guide main body side-connector at the back side of above-mentioned frame to the connection of above-mentioned connector.

5. as the liquid crystal indicator of claim 1 record, it is characterized in that the foregoing circuit plate is fixed into high platform-type, the inclined-plane that the oriented face that faces toward the long limit of above-mentioned connector of above-mentioned guiding elements extends.

6. as the liquid crystal indicator of claim 4 record, it is characterized in that above-mentioned guiding elements is and the integrally formed resinous member of above-mentioned frame.

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