JP3685955B2 - LCD with camera - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a liquid crystal display device such as a car navigation system and a videophone.
[0002]
[Prior art]
In recent years, a large number of devices incorporating a liquid crystal display panel (hereinafter referred to as an LCD panel) as a display device such as a car navigation system, a video phone, a notebook computer, and a portable game machine are used. Since the LCD panel consumes less power and is much thinner and lighter than a display device such as a cathode ray tube, a device incorporating the LCD panel can be reduced in size and weight.
[0003]
FIG. 6 is an assembly diagram showing the structure of a small-sized liquid crystal television that is a device incorporating an LCD panel. The LCD panel 1 that also serves as an internal frame is inserted into a predetermined position on the back side of the front frame 4, the circuit board 3 is fitted into the claws of the front frame 4, and the circuit board 3 is attached to the front frame 4 with a small screw (not shown). It is attached. The back cover 5 is fitted to the front frame 4 via the claws on the outer periphery of the front frame 4. In this way, the front frame 4 and the back cover 5 constitute a hollow cabinet that houses the LCD panel and the circuit board 3.
[0004]
[Problems to be solved by the invention]
The structure of the small-sized liquid crystal television shown in FIG. 6 is a general structure of a liquid crystal display device, but such a device is designed to reduce the gap between components as much as possible in order to reduce the size. ing. That is, the LCD panel 1 occupies most of the internal volume of the cabinet, and the gap between the LCD panel 1 and the circuit board 3 and the gap between the circuit board 3 and the back cover 5 are very small. Therefore, the following points are problematic.
[0005]
(1) In the circuit board 3, the place where the electronic component is mounted and the height of the mounted component are limited. For this reason, the selection range of parts is limited, and the cost of the product may be high, or inexpensive and high-performance parts may not be used. In addition, in order to add functions to the liquid crystal display device, when it is desired to increase the number of components to be mounted on the circuit board 3, the location where the components are mounted is limited. It is difficult to increase the number of parts. Therefore, it is difficult to increase the number of functions unless the size of the liquid crystal display device and the size of the circuit board 3 are increased.
[0006]
(2) The interior of the cabinet is designed to reduce the space between each part as much as possible to reduce the size. Therefore, there is almost no path for releasing heat generated from components such as the LCD panel 1 and the circuit board 3 in the cabinet constituted by the front frame 4 and the back cover 5. In addition, during operation, heat is likely to be trapped in a slight gap between the back cover 5 and the circuit board 3, and the back cover 5 may be overheated or the LCD panel may be overheated after being used for a while. There is. Furthermore, although heat dissipation holes can be provided in the cabinet to dissipate heat, the effects are small and the appearance design is limited because the intervals between the parts are small.
[0007]
(3) It is necessary to use copper foil tape to ground the circuit board. For this reason, the number of parts and the number of processing steps increase, and the productivity decreases.
[0008]
(4) If you want to use different sizes of LCD panels using the same cabinet or structural parts, such as when deploying models, the location where the LCD panel is fixed varies depending on the size. That is, after the LCD panel 1 is inserted into a predetermined position on the back surface of the front frame 4, the circuit board 3 is fixed to a predetermined position on the back surface of the front frame 4 with claws and small screws. Since the place for providing the claw for fixing the substrate 3 and the boss for fixing the screw is different, it is necessary to redesign the cabinet and the position of the hole processing of the substrate, and it is difficult to divert the structural parts as they are. .
[0009]
(5) The small-sized liquid crystal television shown in FIG. 6 is connected to an operation unit (not shown) by a hinge mechanism and has a movable structure. Since the connecting portion of the hinge mechanism does not have a mounting place in the cabinet, it must be structurally independent from the LCD panel and becomes weak in strength. In this example, a metal plate (not shown) is joined to the front frame to supplement the strength.
[0010]
An object of the present invention is to provide a liquid crystal display device in which the above-described problems are improved in a liquid crystal display device that is miniaturized and has a limited internal space, such as a circuit board component mounting range, heat dissipation, and a hinge mechanism. And
[0011]
[Means for Solving the Problems]
The present invention has the following configuration as means for solving the above problems.
[0012]
(1) and the LCD panel,
A circuit board with a camera attached to the end , and
With the front faces the rear surface of the LCD panel, the rear surface faces the front surface of the circuit board, in a state where the camera is positioned in the vicinity of the LCD panel, integrally holding the LCD panel and the circuit board, A holding member of a metal flat plate whose end on the camera side is bent to the front side ;
Together to connect the ground terminal of the circuit board to the holding member, a fixing member for integrally fixing the LCD panel and the circuit board to the holding member,
A cabinet for storing the holding member in which the LCD panel and the circuit board are integrally fixed by the fixing member ;
It is provided with.
[0013]
In this configuration, an LCD panel and a circuit board are attached to both surfaces of a metal holding member so as to face each other to form an integral unit. Therefore, since the integrated unit may be mounted in the cabinet of the camera-equipped liquid crystal display device, the assembly can be simplified and the unit can be easily replaced and adjusted, so that productivity is improved. Also, the unit including a retaining member, since keeping the intensity of the camera-equipped liquid crystal display device, the cabinet case of molded articles, it is possible to reduce the thickness of the molded article conventionally the entire camera-equipped liquid crystal display device The thickness can be reduced. Further, the grounding of the circuit board can be connected to the holding member by the fixing member, and the holding member can function as a heat sink for the circuit board and can also function as a light shielding plate for the camera.
[0014]
(2) the holding member is characterized by the rear surface of its possible insulation treatment layer is formed.
[0015]
In this configuration, the LCD panel and the circuit board are attached to both sides of the metal holding member so as to face each other, constitute an integrated unit, and an insulating treatment layer is formed on the surface of the holding member to which the circuit board is attached. Yes. Therefore, even if the circuit board is brought close to the surface of the metal holding member, the circuit board is not short-circuited, and the LCD panel and the circuit board can be brought closer to each other with the holding member interposed therebetween, with a camera. The liquid crystal display device can be further downsized.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an assembly diagram of a camera-equipped liquid crystal display device according to an embodiment of the present invention. This apparatus is used as a video phone, and is an LCD panel for displaying images of a front frame 4 and a back cover 5 of a molded product constituting a cabinet, a circuit board 3 on which a camera 12 is placed, and a person to whom a user talks. 1, a holding member 2 that holds the LCD panel 1 and the circuit board 3, and a hinge mechanism 6 that holds the liquid crystal display device and fixes it to the device body.
[0025]
The LCD panel 1 is screwed into the screw holes 2a to 2d of the holding member 2 through the through holes 1a to 1d of the LCD panel 1 with the back surface thereof facing the front surface of the holding member 2, respectively. By combining, the holding member 2 is held at a predetermined position on the front surface. In addition, the circuit board 3 has screws 8a to 8b that are not shown in the drawing of the holding member 2 through the through holes 3a to 3b of the circuit board 3 with the front surface thereof facing the back surface of the holding member 2. By being screwed to each other, the holding member 2 is held at a predetermined position. As described above, the LCD panel 1 and the circuit board 3 are attached to each other at predetermined positions on both surfaces of the holding member 2 so as to face each other, and an integrated LCD unit is configured. The LCD unit is fitted into a predetermined position of the front frame 4 and fixed to the front frame 4 with screws 23a to 23b. Further, the LCD unit is screwed to the front frame 4 by screws 22 a and 22 b through the through holes 2 e and 2 h of the holding member 2 and the through holes 6 a and 6 b of the hinge mechanism 6. And the nail | claw of the outer peripheral part of the front frame 4 is fitted to the back cover 5. FIG. After the fitting, screws 24a and 24b are screwed into the back cover 5 through the through holes 4a and 4b of the front frame 4, the through holes 2f and 2g of the holding member 2, and the through holes 6c and 6d of the hinge mechanism 6. Through the above operation, the camera-equipped liquid crystal display device is assembled.
[0026]
The LCD unit can be handled as an independent unit regardless of the connection structure between the cabinet and the device body composed of the front frame 4 and the back cover 5, and circuit adjustment and unit replacement can be easily performed. Productivity is improved. In addition, since assembly is easy, production can be outsourced and processing costs can be reduced.
[0027]
FIG. 2 is a perspective view showing the LCD unit. The LCD unit is configured by attaching a circuit board 3 and an LCD panel 1 to a holding member 2. As a material of the holding member 2, a metal sheet metal is used, and an insulating process is performed on the surface holding the circuit board 3. As an insulation treatment method, there are a method of sticking a resinous sheet on one surface of a sheet metal and a method of processing and using a plate material coated with a resin. Conventionally, a predetermined insulation distance R is required between the circuit board 3 and the LCD panel 1, but since the holding member 2 subjected to insulation treatment is interposed, the insulation distance may be r (<R). Therefore, it can improve about either of the following two items.
[0028]
(1) Conventionally, since the entire liquid crystal display device is downsized, the distance between the circuit board 3 and the LCD panel 1 becomes small, and the back surface of the LCD panel 1 of the circuit board 3 that cannot be mounted without securing an insulation distance. Since the insulation distance (Rr) can be provided in the part facing the part, it is possible to mount the component on the part facing the back side of the LCD panel 1 of the circuit board 3 as well. Tall parts that could not be mounted can be mounted. Therefore, the mountable range of the substrate is expanded, and the surface facing the holding member 2 can be effectively used.
[0029]
(2) The back surface of the LCD panel 1 can be narrowed by the insulation distance (Rr), and the liquid crystal display device can be made thinner.
[0030]
Since the holding member 2 is made of metal, it can be connected to the circuit board 3 and used as a ground. If the holding member 2 is resin-coated as an insulating material, the resin-coated surface cannot be grounded, but the holding member 2 is bent so that the non-resin-coated surface contacts the circuit board. Thus, the holding member 2 and the circuit board 3 can be connected without using a lead wire or the like.
[0031]
FIG. 3 is a schematic cross-sectional view of the ground connection. The surface of the holding member 2 that is resin-coated is referred to as an insulating surface A, and the surface that is not resin-coated is referred to as a non-insulating surface B. Although the circuit board 3 faces the insulating surface A of the holding member 2, the end of the holding member 2 is bent into a U-shape as shown in FIG. The surface B is in contact with the surface C of the circuit board 3. The circuit board 3 is fixed to the holding member 2 with a metal screw 8a. In order to ensure the ground connection, the hole 3a of the circuit board 3 penetrating the screw 8a is a through hole. A copper foil portion 9 connected to the ground of the circuit board 3 is provided around the hole 3a on the surface C and the surface D, and soldering is performed on the through hole and the copper foil portion 9. On the other hand, the hole 2a of the holding member 2 is subjected to burring. When the holding member 2 is fixed with the screw 8a, the solder pile applied to the copper foil portion 9 is deformed and adhered to the holding member 2, and the screw 8a is passed through the hole 3a of the circuit board 3 to form the burring hole 2a. The ground connection is ensured by screwing.
[0032]
Since the holding member 2 is made of metal, it can be connected to the circuit board 3 and used as a heat sink. Since the holding member 2 is in close contact with the circuit board 3 by screws as described above, the heat generated in the circuit board 3 is propagated to the holding member 2 so that the stagnation of heat is alleviated. Then, it is conducted to the hinge mechanism 6 and discharged to the outside of the cabinet.
[0033]
Here, since the holding member 2 is made of metal, since the strength of the liquid crystal display device can be maintained by the holding member itself, the thickness of the molded product can be made thinner than before, so that the thickness of the liquid crystal display device can be further reduced. Can be thin.
[0034]
FIG. 4 shows that the front panel 4 suitable for the screen size of the LCD panel 1 and the LCD panel 1 is replaced with a large size LCD panel 10 and the front frame 11 suitable for the screen size of the LCD panel 10 in the configuration of FIG. It is an assembly drawing of a liquid crystal display device.
[0035]
Conventionally, when the circuit board 3 is fixed to the front frame 4, the position of the boss for fixing the circuit board 3 provided on the front frame 4 is determined by the correlation between the circuit board 3 and the LCD panel 1. When a new model using a different LCD panel is created, it is necessary to redesign the mounting parts or design in advance according to the maximum size LCD panel. On the other hand, in the case of the method of fixing the circuit board 3 to the back cover 5, a boss must be provided to fix the circuit board 3 with screws, so that the thickness of the back cover 5 increases, and the entire liquid crystal display device Thickness increases. In contrast, in the present invention, the LCD panel is not structured to be screwed to the front frame 4, the front frame 11, and the back cover 5 constituting the cabinet, so the size of the LCD panel of the LCD unit is changed from the front frame. Can be changed relatively freely. Therefore, by configuring the LCD unit with the LCD panel 1, the holding member 2, and the circuit board 3, the entire liquid crystal display device can be reduced in size and thickness, and various types of LCD panels can be attached. Become.
[0036]
FIG. 5 is a vertical cross-sectional view of the central portion of the assembled liquid crystal display device with a camera shown in FIG.
[0037]
Since the configuration is the same as that described with reference to FIG. 1, only the portions not described in FIG. 1 will be described. The screw 8a connects the circuit board 3 and the holding member 2 as described in FIG. On the back surface of the LCD panel 1, a light guide plate 14 for guiding a backlight (not shown) for the LCD panel is incorporated. A cold cathode tube or EL is used for the backlight. The light guide plate 14 is approximately the same size as the LCD screen. When this apparatus is used as a videophone, since the user talks while watching the liquid crystal display, the camera 12 is designed to be close to the LCD panel 1 so that the user's line of sight does not feel strange. . When light from the backlight leaks from the light guide plate 14, the light enters the camera 12, and when the user is photographed by the camera 12, the user cannot be clearly photographed, causing a problem. Even in devices that do not incorporate the camera 12, a non-woven fabric or the like is usually applied, or a leakage light blocking wall is created with a resin molded product to prevent light leakage. In this example, a part of the holding member 2 is bent. The processed light shielding wall 13 prevents the leakage light of the backlight from entering the camera 12 from the light guide plate 14. In this structure, no additional parts are required, and the holding member is a metal sheet metal. Therefore, the holding member is thin, has high light shielding properties, and has good workability.
[0038]
In FIG. 5, since the liquid crystal display device of the present embodiment has a structure having a folding function of the display unit, the connection part 15 of the hinge mechanism is connected to the main body connection part. Since the connection between the holding member 2 and the hinge mechanism 6 uses screws or the like and does not require any additional parts, the hinge mechanism 6 can be configured with few parts. When it is not necessary to move the liquid crystal display device, the hinge mechanism 6 may not be connected to the holding member 2, but the holding member 2 itself may be extended to be connected to other devices.
[0039]
In order to realize the folding function of the liquid crystal display device, the hinge mechanism 6 having a rotation mechanism can use a general-purpose rotation mechanism, and requires a cable space for circuit connection with the device body at the center. The rotation mechanism is separate on the left and right. In the hinge mechanism 6 alone, the left and right can be at different angles. Therefore, if the display device is vulnerable to torsional stress, the rotation operation is hindered, but the hinge mechanism is connected to the left and right ends of the holding member 2. Therefore, it is possible to synchronize the rotational movement of the hinge mechanism 6 with high accuracy on the left and right. Therefore, the liquid crystal display device can be held with high accuracy and can be moved at a minute angle.
[0040]
Due to the above improvements, the liquid crystal display device can be reduced in size and thickness, and it is possible to use inexpensive, high-performance parts, good heat dissipation and assembly, and overall cost reduction. Can be implemented.
[0041]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0042]
(1) The LCD panel and the circuit board are attached to both sides of the metal holding member so as to face each other to form an integrated unit, so that the integrated unit can be mounted in the cabinet of the camera-equipped liquid crystal display device. Therefore, assembling can be simplified and replacement and adjustment of the unit can be easily performed, so that productivity is improved and the strength of the liquid crystal display device with the camera is maintained by the unit including the holding member, so the cabinet is molded. In the case of a product, since the thickness of the molded product can be made thinner than before, the thickness of the entire liquid crystal display device with a camera can be made thinner. Further, the grounding of the circuit board can be connected to the holding member by the fixing member, and the holding member can function as a heat sink for the circuit board and can also function as a light shielding plate for the camera.
[0043]
(2) The LCD panel and the circuit board are attached to both surfaces of the metal holding member so as to face each other to constitute an integrated unit, and an insulating treatment layer is formed on the surface of the holding member to which the circuit board is attached. Therefore, even if the circuit board is brought close to the surface of the metal holding member, the circuit board is not short-circuited, and the LCD panel and the circuit board can be brought closer to each other with the holding member interposed therebetween, with a camera. The liquid crystal display device can be further downsized.
[Brief description of the drawings]
FIG. 1 is an assembly view of a liquid crystal display device according to an embodiment of the present invention.
FIG. 2 is a perspective view of a display unit of the liquid crystal display device according to the embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view of a connection portion between a circuit board and a holding member of a liquid crystal display device according to an embodiment of the present invention.
FIG. 4 is another assembly view of the liquid crystal display device according to the embodiment of the present invention.
FIG. 5 is a schematic cross-sectional view of a central portion of a liquid crystal display device according to an embodiment of the present invention.
FIG. 6 is an assembly view of a small liquid crystal television showing the shape of a conventional liquid crystal display device.
[Explanation of symbols]
1-LCD panel 1a-d, 2a-h, 3a-b, 4a-b, 6a-d-hole 2-holding member 3-circuit board 4-front frame 5-back cover 6-hinge mechanism 8a-b, 21a -D, 22a-b, 23a-b, 24a-b-bis 12-camera

Claims (2)

And the LCD panel,
A circuit board with a camera attached to the end , and
With the front faces the rear surface of the LCD panel, the rear surface faces the front surface of the circuit board, in a state where the camera is positioned in the vicinity of the LCD panel, integrally holding the LCD panel and the circuit board, A holding member of a metal flat plate whose end on the camera side is bent to the front side ;
Together to connect the ground terminal of the circuit board to the holding member, a fixing member for integrally fixing the LCD panel and the circuit board to the holding member,
A cabinet for storing the holding member in which the LCD panel and the circuit board are integrally fixed by the fixing member ;
Camera-equipped liquid crystal display device comprising the. The holding member, a camera-equipped liquid crystal display device according to claim 1, characterized in that the rear surface to the insulation treatment layer of that is formed.

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