JP2001188222A - Liquid crystal display device and electric/electronic equipment using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that it has been impossible to sufficiently suppress unwanted radiation electric waves from electronic parts on a printed board 15 for the reason that the electronic parts mounted on the printed board 15 have not been shielded. SOLUTION: A substrate for driving a liquid crystal has a parts mounting surface on one side and a grounding surface on the other side, and this grounding surface is electrically connected with a conductive reflecting plate and also the substrate is supported and fixed on the conductive reflecting plate through the parts mounting surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having an improved structure and mounting structure of an internal substrate for suppressing unnecessary radiation, and to an electric / electronic device using the same.

[0002]

2. Description of the Related Art In recent years, there has been a demand for an improvement in image quality of a liquid crystal display device, so that an internal liquid crystal display element has been miniaturized, and mounting of a drive circuit for driving the liquid crystal display element on a substrate has also been increased. Have been. For this reason, since the area of the ground pattern cannot be made sufficiently large, stable display quality cannot be obtained due to the influence of noise inside and outside the device, or EMI (Electro Magnetic Interference;
There has been a problem that unnecessary radiation of electromagnetic waves causing radio noise interference occurs.

To solve such a problem, for example, there is a liquid crystal display device disclosed in Japanese Patent Application Laid-Open No. 6-82803. FIG. 11 is a sectional view showing a conventional liquid crystal display device disclosed in Japanese Patent Application Laid-Open No. 6-82803.
In the figure, 4 is a liquid crystal display screen, 14 is a liquid crystal display element,
Reference numeral 15 denotes a printed board, 16 denotes a metal plate disposed between the light guide 19 and the printed board 15, and is electrically connected to a ground pattern (not shown) of the printed board 15, and 17 denotes a metal plate and the printed board 15. An insulating layer provided between
Reference numeral 8 denotes cutouts provided at four corners of the insulating layer 17, and reference numeral 19 denotes a light guide. Reference numeral 20 denotes a metal frame for housing each component of the liquid crystal display device, 21 denotes an electronic component mounted on the printed board 15, 22 denotes the liquid crystal display element 14 and the printed board 1
Reference numeral 23 denotes a liquid crystal display window provided on the upper surface of the metal frame 20.

[0004] In brief, the metal plate 16 and the insulating layer 17 have a large area of approximately the same size as the printed board 15 or the light guide 19, and the printed board 15 is arranged adjacent to these. The metal plate 16 and the ground pattern formed on the printed board 15 are electrically connected to each other at the cutout 18 of the insulating layer 17. As a result, a stable ground line is supplied, and the influence of noise that enters from the outside and noise that occurs inside can be eliminated, and stable display quality can be obtained. Also, EM
It is also possible to suppress the generation of unnecessary radiation waves that cause I.

[0005] In addition to the liquid crystal display device, there are various shield structures for the purpose of eliminating the effects of noise entering from the outside and noise generated inside as described above. There is an electronic circuit shield structure disclosed in US Pat. No. 17,377. This relates to a shield structure for shielding an electronic circuit from radio waves, and particularly to a shield structure for a high-frequency circuit having an antenna. FIG. 12 is a cross-sectional view showing a conventional electronic circuit shield structure disclosed in Japanese Patent Application Laid-Open No. 11-17377. In the figure, reference numeral 15 denotes a printed circuit board having a conductive layer 24 sandwiched between two substrates, 24 denotes a conductive layer, 25 denotes a shield case having a flat box shape made of plastic, and 27 denotes a high-frequency circuit block mounted on the printed circuit board 15 , 28 are antennas mounted on the surface of the printed circuit board 15 opposite to the surface on which the high-frequency circuit block 27 is mounted, 29 is a ground electrode layer formed around the opening of the through hole 31, and 30 is formed on the inner wall of the through hole 31 Reference numeral 31 denotes a through hole penetrating the printed circuit board 15, reference numeral 32 denotes a step formed around the opening of the shield case 25, and reference numeral 33 denotes a conductive paint film formed on the inner surface of the shield case 25.

The outline will be described.
5 is mounted on the step 32 of the opening of the shield case 25 so that the surface on which the high-frequency circuit block 27 is mounted is on the inside. At this time, the conductive paint film 33 formed on the inner surface of the shield case 25 is in contact with the ground electrode layer 29, and the conductive paint film 33 formed on the conductive layer 24 of the printed circuit board 15 and the inner surface of the shield case 25 is formed. 33 are conducted through the inner wall conductive layer 30. Thereby, the high-frequency circuit block 27 is connected to the conductive layers 2 electrically connected to each other.
4. The through-hole 31, the inner wall conductive layer 30, the ground electrode layer 29, and the conductive paint film 33 of the through-hole 31, are housed inside a shield structure and are shielded from external radio waves. No longer leaks.

[0007]

Since the conventional liquid crystal display device is configured as described above, since the electronic components mounted on the printed board 15 are not shielded, the electronic components on the printed board 15 There is a problem that the unnecessary radiated radio waves cannot be sufficiently suppressed.

When the metal plate 16 is not electrically connected to components other than the printed board 15 and the connection between the metal plate 16 and the ground pattern of the printed board 15 is weak, the metal plate 16 is On the contrary, there is a problem that the antenna may work as a radiation source.

Furthermore, since there is no mechanism for radiating heat generated from the electronic components mounted on the printed circuit board 15, only the area directly below the printed circuit board 15 becomes hot, which may degrade the characteristics of the electronic components. there were.

Further, there is a problem that an electric / electronic device using a liquid crystal display device which cannot sufficiently suppress unnecessary radiation waves as described above causes EMI with other electric / electronic devices. .

On the other hand, it has been considered that the shield structure of the electronic circuit is applied to a liquid crystal display device. This is because each component of the shield structure is electrically connected, so that each component is sufficiently grounded and does not become a radio wave radiation source as described above. A printed circuit board on which a liquid crystal driving circuit is mounted is used in place of 27, and a stepped portion 32 of the opening of the shield case 25 is arranged such that the surface on which the liquid crystal driving circuit is mounted is inside.
By mounting the liquid crystal driving circuit on a liquid crystal panel, the liquid crystal driving circuit is shielded from external radio waves, and the leakage of radio waves from the internal liquid crystal driving circuit is suppressed. However, in such a configuration, since the liquid crystal driving circuit is hermetically sealed in the shield case 25, it is necessary to remove the shield case 25 from the printed circuit board 15 of the liquid crystal driving circuit when performing an operation test or the like. It will take. In addition, since the liquid crystal panel is provided on the surface of the printed circuit board 15 on which the liquid crystal driving circuit is not mounted, the liquid crystal driving circuit cannot be shielded from the liquid crystal panel side. I had no choice.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can suppress the generation of unnecessary radiated radio waves from a liquid crystal display device and can radiate heat generated from a liquid crystal driving circuit. It is an object of the present invention to obtain a liquid crystal display device and an electric / electronic device using the same.

[0013]

In a liquid crystal display device according to the present invention, a liquid crystal driving substrate has a component mounting surface on one surface and a grounding surface on the other surface. Are electrically connected, and are supported and fixed to the conductive reflection plate from the component mounting surface side.

The liquid crystal display device according to the present invention includes an engaging portion provided on the liquid crystal driving substrate and / or the conductive reflection plate to support and fix the liquid crystal driving substrate to the conductive reflection plate.
The ground plane and the conductive reflection plate are electrically connected via the engaging portion.

In the liquid crystal display device according to the present invention, the engaging portion is constituted by the engaging screw hole and the engaging screw portion.

In the liquid crystal display device according to the present invention, the engaging portion is constituted by a claw portion provided on the conductive reflecting plate for engaging and fixing the liquid crystal driving substrate.

The liquid crystal display device according to the present invention includes a mounting guide portion provided on the conductive reflection plate for determining a mounting position of the liquid crystal driving substrate.

The liquid crystal display device according to the present invention includes a heat radiating means provided on the conductive reflection plate and radiating heat generated from components mounted on the liquid crystal driving substrate.

An electric / electronic device according to the present invention includes the liquid crystal display device according to any one of the first to sixth aspects.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. The liquid crystal display devices are roughly classified into a transmission type liquid crystal display device and a reflection type liquid crystal display device. In brief, a reflection type liquid crystal display device has a liquid crystal panel including a liquid crystal display portion and a liquid crystal cell, and a reflection plate installed on the back of the liquid crystal panel. The light incident through the reflector is reflected by the reflector and returned to the liquid crystal display surface side, and the reflected light is used as illumination for the liquid crystal display unit. In addition, the transmissive liquid crystal display device
A liquid crystal panel including a liquid crystal display, a liquid crystal cell, and a backlight unit (backlight); and a reflector for reflecting light from the backlight unit toward the liquid crystal display unit. The light is reflected by the reflector, and the reflected light is used as illumination for the liquid crystal display unit. The liquid crystal display device of the present invention can be applied to both the transmission type and the reflection type, and the reflection plate is a conductive reflection plate made of a conductive material. In the following embodiments, a case where the present invention is applied to a transmission type liquid crystal display device will be described for simplicity of description.

FIG. 1 is an exploded perspective view showing a structure of a liquid crystal driving substrate of a liquid crystal display device according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view showing another structure of the liquid crystal driving substrate according to the first embodiment. FIGS. 3 and 3 are perspective views showing a mounting structure of a liquid crystal driving substrate on a liquid crystal panel in the liquid crystal display device according to the first embodiment. In the figure, 1 is a liquid crystal driving substrate,
One surface is a component mounting surface 2 on which a liquid crystal driving circuit for driving a liquid crystal display element is mounted, and a metal thin film layer is formed on the entire surface of the other surface to form a grounding surface 3. Signal line 2a in the signal line layer and power supply 2b in the power supply layer
And a multi-layer substrate provided with Reference numeral 1a denotes a liquid crystal driving substrate of another example, which has a component mounting surface 2 on one surface on which a liquid crystal driving circuit for driving a liquid crystal display element is mounted, and a wiring pattern on the other surface on which no electronic components are mounted. Is the unmounted surface 3a where the surface is exposed. The unmounted surface 3a is provided with a ground plane 3 adjacent to the inner layer.
A ground plane is formed by electrically connecting these wiring patterns. Reference numeral 4 denotes a liquid crystal display unit, 5 denotes a backlight, and 6 denotes a metal reflection plate (conductive reflection plate) that reflects light from the backlight 5 and supplies illumination light to the liquid crystal display unit 4. Reference numeral 7 denotes a liquid crystal panel including a liquid crystal display unit 4, a backlight 5, and a metal reflection plate 6, and reference numeral 8 denotes a liquid crystal display device of the present invention including a liquid crystal panel 7 and a liquid crystal driving substrate 1.

Next, the outline will be described. One of the liquid crystal driving substrates 1 and 1a is a component mounting surface 2 and the other is a whole grounding surface 3 or a non-mounting surface 3a provided with a grounding pattern. It is supported and fixed by. At this time, as shown in FIG. 3, the component mounting surface 2 of the liquid crystal driving substrates 1 and 1a is supported and fixed toward the metal reflection plate 6, and at the same time, the ground surface 3 and the unmounted surface 3a and the metal reflection plate 6 Are electrically connected. By doing so, the electronic components, the signal line 2a, and the power supply 2b that constitute the liquid crystal driving circuit, which are the main factors that generate unnecessary radiation waves,
External electric waves are shielded by being sandwiched between the metal reflection plate 6 and the ground plane 3 or the unmounted surface 3a, and further by the electrical connection between the metal reflection plate 6 and the ground plane 3 or the unmounted surface 3a. And a shielding structure for blocking unnecessary radiation from the liquid crystal driving substrates 1 and 1a.

Thus, it is possible to prevent the electromagnetic waves generated from the liquid crystal driving substrates 1 and 1a from interfering with components outside the liquid crystal driving substrates 1 and 1a, such as the housing of the liquid crystal display device 8, for example. . Further, since there is no need to provide a special shielding structure for suppressing unnecessary radiated radio waves, the number of components can be reduced, and manufacturing can be facilitated and cost can be reduced.

The electrical connection between the metal reflector 6 and the ground plane 3 and the unmounted surface 3a of the liquid crystal driving substrates 1 and 1a is as follows.
When a portion electrically connected to the ground plane 3 or the unmounted surface 3a is provided on the component mounting surface 2 of the liquid crystal driving substrates 1 and 1a, the connection portion is electrically connected to the metal reflection plate 6. May be.

As described above, according to the first embodiment, the liquid crystal driving substrates 1 and 1a have the component mounting surface 2 on one surface and the ground surface 3 or the unmounted surface 3a having the ground pattern on the other surface. Since the ground plane 3 or the unmounted surface 3a having the ground pattern is electrically connected to the metal reflector 6 and supported and fixed to the metal reflector 6 from the component mounting surface 2 side, the liquid crystal display Since the electronic components, the signal line 2a, the power supply 2b, and the like constituting the liquid crystal driving circuit, which are the main noise sources of the device 8, can be shielded by the metal reflector 6 and the ground plane 3 or the unmounted surface 3a, Unnecessary radiation waves generated from the liquid crystal display device 8 can be suppressed.

In addition, it is possible to suppress the electromagnetic waves generated from the liquid crystal driving substrates 1 and 1a from interfering with components outside the liquid crystal driving substrates 1 and 1a, such as the housing of the liquid crystal display device 8.

Furthermore, since there is no need to provide a special shielding structure for suppressing unnecessary radiated radio waves or a new member for EMI countermeasures, the number of parts can be reduced, and manufacturing can be facilitated and cost can be reduced. it can.

Embodiment 2 In the second embodiment, a liquid crystal driving substrate is supported and fixed on a conductive reflection plate, and at the same time, an engaging portion for electrically connecting a ground plane and the conductive reflection plate is provided.

FIG. 4 is a perspective view showing a mounting structure of a liquid crystal driving substrate in a liquid crystal display device according to Embodiment 2 of the present invention. In the figure, 9a is a fixing screw (engaging screw portion, engaging portion) for supporting and fixing the liquid crystal driving substrate 1 to the metal reflecting plate 6, and 9b is provided on the metal reflecting plate 6 and has a fixing screw 9a. Screw holes (engaging screw holes, engaging portions) to be screwed.
The same components as those in FIG. 3 are denoted by the same reference numerals, and redundant description will be omitted.

Next, the outline will be described. The fixing screw 9a is formed of a conductive material, and is screwed into a screw hole 9b of the metal reflection plate 6 through a through hole provided in the metal reflection plate 6 to thereby attach the liquid crystal driving substrate 1 to the metal reflection plate 6. Support and fix. At this time, the ground plane 3 and the metal reflector 6 are simultaneously electrically connected via the fixing screw 9a.

FIG. 5 is a perspective view showing another mounting structure of the liquid crystal driving substrate in the liquid crystal display device according to the second embodiment of the present invention. In the figure, reference numeral 10 denotes fixing claws (claw portions, engaging portions) provided on the metal reflection plate 6 for supporting and fixing the liquid crystal driving substrate 1 to the metal reflection plate 6. The same components as those in FIG. 3 are denoted by the same reference numerals, and redundant description will be omitted.

Next, the outline will be described. The fixing claw 10 is formed of a conductive material and has a hook shape so as to press the side surface of the liquid crystal driving substrate 1 and the ground plane 3 against each other. The liquid crystal driving substrate 1 is introduced from above the fixing claws 10 to be supported and fixed. At this time, the fixing claw 10 is provided with a slope from the upper side to the lower side so that the fixing claw 10 can be easily attached to reduce the frictional force of the fixing claw 10, and the liquid crystal driving substrate 1 is introduced so as to slide on the slope. Then, they are fitted with the fixing claws 10. The electrical connection between the ground plane 3 and the metal reflection plate 6 is made on the press-contact surface of the fixing claw 10 with the ground plane 3.

In the second embodiment, the engagement portion for supporting and fixing the liquid crystal driving substrate 1 to the metal reflection plate 6 is provided.
Although the example in which the fixing screw 9a, the screw hole 9b, and the fixing claw 10 are provided has been described, the present invention is not limited thereto, and the liquid crystal driving substrate 1 is securely fixed to the metal reflecting plate 6, and
Any structure can be used as long as the ground plane 3 and the metal reflector 6 can be electrically connected.

Further, the electrical connection between the metal reflection plate 6 and the ground plane 3 of the liquid crystal driving substrate 1 is performed by forming a portion electrically connected to the ground plane 3 on the component mounting surface 2 of the liquid crystal driving substrate 1. If provided, the electrical connection between the connection portion and the metal reflection plate 6 may be made by the fixing claw 10.

As described above, in the second embodiment, the engaging portions provided on the liquid crystal driving substrate 1 and / or the metal reflecting plate 6 for supporting and fixing the liquid crystal driving substrate 1 to the metal reflecting plate 6. (Fixing screw 9a, screw hole 9b, fixing claw 10)
And the ground plane 3 and the metal reflector 6
Are electrically connected to each other, so that the liquid crystal driving substrate 1 can be supported and fixed to the metal reflector 6 and the ground plane 3 and the metal reflector 6 can be electrically connected reliably. A liquid crystal display device that reliably shields radio waves can be provided.

Further, according to the second embodiment, since the engaging portion is constituted by the fixing screw 9a and the screw hole 9b,
In addition to the same effects as described above, it is possible to prevent the metal reflector 6 and the ground plane 3 from contacting poorly and prevent the metal reflector 6 from acting as a radiation source as an antenna.

Further, according to the second embodiment, the engaging portion is constituted by the fixing claw 10 which is provided on the metal reflecting plate 6 and engages and fixes the liquid crystal driving substrate 1. The work of attaching the substrate 1 to the metal reflection plate 6 can be easily performed.
In addition, it is possible to provide a liquid crystal display device which can perform the operation reliably and more reliably suppresses unnecessary radiated radio waves.

The metal reflection plate 6 of the liquid crystal driving substrate 1
The operation of removing the liquid crystal driving substrate 1 and the operation inspection of the liquid crystal driving circuit can be easily performed.

Furthermore, since no screws or adhesives are used, the number of components can be reduced, and a liquid crystal display device can be provided at low cost.

The fixing screw 9a, the screw hole 9b, and the fixing claw 10 described in the second embodiment may be used in combination. This makes it possible to further improve the reliability of supporting and fixing the liquid crystal driving substrate 1 to the metal reflector 6 and the electrical connection between the ground plane 3 and the metal reflector 6.

Embodiment 3 In the third embodiment, when a liquid crystal driving substrate is mounted on a conductive reflection plate, a mounting guide portion for determining the mounting position is provided on the conductive reflection plate.

FIG. 6 is a perspective view showing a structure for mounting a liquid crystal driving substrate on a liquid crystal panel in a liquid crystal display device according to Embodiment 3 of the present invention. In the figure, reference numeral 11 denotes a board mounting guide (mounting guide section) for determining a mounting position of the liquid crystal driving substrate 1 on the metal reflection plate 6. In addition,
The same components as those in FIG. 3 are denoted by the same reference numerals, and redundant description will be omitted.

Next, the outline will be described. The substrate mounting guides 11 are arranged, for example, at positions along four sides of the liquid crystal driving substrate 1 as shown in FIG. The liquid crystal driving substrate 1 has a component mounting surface 2 in an area surrounded by the substrate mounting guide 11.
Is fixed to the metal reflection plate 6 so as to be fitted. Thereby, the mounting position of the liquid crystal driving substrate 1 can be easily determined.

The substrate mounting guide 11 may be provided along the four corners of the liquid crystal driving substrate 1 other than that shown in FIG. 6, or the mounting position of the liquid crystal driving substrate 1 may be determined at a minimum. In order to be able to do so, the liquid crystal driving substrate 1 may be provided along four sides or a part of four corners.

Further, the substrate mounting guide 11 is provided at a position along the outer periphery of the liquid crystal driving substrate 1, and when the liquid crystal driving substrate 1 is mounted on the metal reflecting plate 6, the substrate mounting guide 11 By surrounding the liquid crystal driving substrate 1, a shielding structure having a sealed space including the ground plane 3, the substrate mounting guide 11, and the metal reflecting plate 6 can be configured. By doing so, the above-described effects of the substrate mounting guide 11 can be exhibited, and unnecessary radiation waves generated from the liquid crystal display device 8 can be more reliably shielded.

FIG. 7 is a perspective view showing a structure in which the liquid crystal driving substrate 1 in FIG. 6 is fixedly supported on the metal reflector 6 by the fixing screws 9a and the screw holes 9b of the second embodiment.
FIG. 8 shows the metal reflector 6 of the liquid crystal driving substrate 1 in FIG.
FIG. 9 is a perspective view showing a configuration in which the support claw is fixed by the fixing claw 10 according to the second embodiment. The same components as those in FIGS. 4 and 5 are denoted by the same reference numerals, and redundant description will be omitted.

Next, the outline will be described. The substrate mounting guides 11 are arranged at positions along four sides of the liquid crystal driving substrate 1 as shown in, for example, FIG. 7 or FIG. The liquid crystal driving substrate 1 is placed on the metal reflection plate 6 such that the component mounting surface 2 is fitted in a region surrounded by the substrate mounting guide 11. At this time, in the example of FIG. 7, the liquid crystal driving substrate 1 is supported and fixed to the metal reflection plate 6 by the fixing screws 9a and the screw holes 9b.
The ground plane 3 and the metal reflection plate 6 are electrically connected via the. In the example of FIG. 8, the metal reflection plate 6 of the liquid crystal driving substrate 1 is used.
The grounding surface 3 and the metal reflector 6 are electrically connected via the fixing claws 10.

As described above, the board mounting guide 11
The fixing screw 9a and the screw hole 9 described in the second embodiment.
By combining b and the fixing claw 10, the liquid crystal driving substrate 1 can be more easily and quickly attached to the metal reflection plate 6.

As described above, according to the third embodiment, the liquid crystal driving substrate 1 is provided with the substrate mounting guide 11 for determining the mounting position of the liquid crystal driving substrate 1 provided on the metal reflection plate 6. Can be easily determined.

The metal reflection plate 6 and the liquid crystal driving substrate 1
When a portion electrically connected to the ground plane 3 is provided on the component mounting surface 2 of the liquid crystal driving substrate 1, the connection portion and the substrate mounting guide 11 are electrically connected to each other. May be connected.

Embodiment 4 FIG. In the fourth embodiment, a heat radiating means for radiating heat generated from components mounted on a liquid crystal driving substrate is provided on a conductive reflection plate.

FIG. 9 is a perspective view showing a mounting structure of a liquid crystal driving substrate on a liquid crystal panel in a liquid crystal display device according to Embodiment 4 of the present invention. In the figure, reference numeral 6a denotes a metal reflector (conductive reflector) provided with a heat radiating mechanism 12 for radiating heat generated from components mounted on the liquid crystal driving substrate 1, 12
Is a heat radiating mechanism (radiating means) provided on the metal reflecting plate 6a and radiating heat generated from components mounted on the liquid crystal driving substrate 1 so as not to concentrate on the liquid crystal driving substrate 1. The same components as those in FIG. 3 are denoted by the same reference numerals, and redundant description will be omitted.

Next, the outline will be described. The radiating mechanism 12 has a configuration in which a large number of folds are formed on, for example, a surface of a metal reflecting plate 6a (a surface facing the component mounting surface 2 of the liquid crystal driving substrate 1 when the liquid crystal driving substrate 1 is supported and fixed). And By these folds, the surface area of the metal reflecting plate 6a can be increased to provide a heat radiation function. Also, the liquid crystal driving substrate 1
Is attached to the metal reflection plate 6a from the component mounting surface 2 side in the same manner as in the first embodiment, and is fixed by the engaging portion as described in the second embodiment. As a result, heat generated from the components mounted on the liquid crystal driving substrate 1 is radiated to the outside of the liquid crystal display device 8 via the radiating mechanism 12.

As described above, according to the fourth embodiment, since the heat radiating mechanism 12 provided on the metal reflection plate 6a and radiating the heat generated from the components mounted on the liquid crystal driving substrate 1 is provided, Instability of the operation of the liquid crystal display device 8 due to heat generated from components mounted on the driving substrate 1 can be suppressed.

In the fourth embodiment, the heat radiation mechanism 1
2 shows a case in which a large number of folds are provided on the surface of the metal reflection plate 6a. However, the present invention is not limited to this, and the heat radiation mechanism 12 efficiently dissipates heat generated from components mounted on the liquid crystal driving substrate 1. Any structure may be used as long as it radiates heat well and does not hinder the attachment of the liquid crystal driving substrate 1 to the metal reflection plate 6a.

The same effect as described above can be obtained by applying the metal reflector 6a provided with the heat radiating mechanism 12 to the configuration of the first to third embodiments.

Embodiment 5 The fifth embodiment relates to an electric / electronic device including the liquid crystal display device described in the first to fourth embodiments.

FIG. 10 is a perspective view showing an electric / electronic device according to Embodiment 5 of the present invention. In the figure, reference numeral 13 denotes an electric / electronic device equipped with the liquid crystal display device 8 of the present invention, and shows a liquid crystal monitor as an example.

Next, the outline will be described. By providing the liquid crystal display device 8 of the present invention, unnecessary radiated radio waves can be particularly suppressed, so that the EMI between the electric / electronic device 13 and another electric / electronic device can be suppressed. There are various laws and regulations on such EMI, and the allowable value of the intensity of the interference wave derived from the unnecessary radiated radio waves from all electric and electronic devices such as home appliances, information devices, medical devices, and industrial devices is specified. ing. Therefore, the provision of the liquid crystal display device 8 of the present invention makes it possible to easily provide electric / electronic devices that comply with the various EMI regulations.

As described above, according to the fifth embodiment, since the electric / electronic device 13 includes the liquid crystal display device 8 of the present invention, it is possible to suppress EMI between the electric / electronic device and other electric / electronic devices. it can. As a result, it is possible to quickly conform to various laws and regulations of the EMI, and it is possible to accelerate the market entry of the electric / electronic device 13 including the liquid crystal display device 8 of the present invention.

Since the liquid crystal display device 8 of the present invention is provided, it is not necessary to provide a special member or a shielding structure for EMI countermeasures after the product design of the electric / electronic device 13, so that the cost for EMI countermeasures is reduced. Can be reduced.

[0062]

According to the liquid crystal display device of the present invention, the liquid crystal driving substrate has a component mounting surface on one surface and a grounding surface on the other surface, and electrically connects the grounding surface and the conductive reflector. Since it is connected to and fixed to the conductive reflector from the component mounting surface side, it is possible to shield the radio waves generated from the electronic components constituting the liquid crystal drive circuit which is the main noise source of the liquid crystal display device, There is an effect that unnecessary radiation waves from the liquid crystal display device can be suppressed.

Further, there is an effect that the electromagnetic waves generated from the liquid crystal driving substrate can be prevented from interfering with the components outside the liquid crystal driving substrate.

Further, since it is not necessary to provide a special shielding structure for suppressing unnecessary radiated radio waves and a new member for EMI countermeasures, the number of parts can be reduced, and the manufacturing can be simplified and the cost can be reduced. effective.

According to the liquid crystal display device of the present invention, there is provided an engaging portion provided on the liquid crystal driving substrate and / or the conductive reflection plate to support and fix the liquid crystal driving substrate to the conductive reflection plate. Since the ground plane and the conductive reflector are electrically connected via the part, the support and fixing of the liquid crystal driving substrate to the conductive reflector and the electrical connection between the ground plane and the conductive reflector are ensured. The present invention has the effect of providing a liquid crystal display device that more reliably suppresses unnecessary radiation waves.

According to the liquid crystal display device of the present invention, since the engaging portion is constituted by the engaging screw hole and the engaging screw portion, the same effect as in the above paragraph 0065 can be obtained, and the conductive reflection plate and the ground plane can be obtained. Can be prevented from causing a contact failure and the conductive reflector serving as a radiation source as an antenna.

According to the liquid crystal display device of the present invention, the engaging portion is formed by the claw portion provided on the conductive reflection plate and engaging and fixing the liquid crystal driving substrate. There is an effect that a liquid crystal display device can be provided that can easily and surely perform the work of attaching to a plate and more reliably suppresses unnecessary radiation waves.

Further, since the work of removing the liquid crystal driving substrate from the conductive reflection plate can be easily performed, the replacement of the liquid crystal driving substrate and the operation inspection of the liquid crystal driving circuit can be easily performed. effective.

Furthermore, since no screws or adhesives are used, the number of components can be reduced, and the liquid crystal display device can be provided at low cost.

According to the liquid crystal display device of the present invention, the mounting position of the liquid crystal driving substrate 1 is easily determined because the mounting guide portion is provided on the conductive reflection plate and determines the mounting position of the liquid crystal driving substrate. There is an effect that can be.

According to the liquid crystal display device of the present invention, since the heat radiating means provided on the conductive reflection plate and radiating the heat generated from the liquid crystal driving circuit is provided, the heat generated from the components mounted on the liquid crystal driving substrate is provided. Therefore, the operation of the liquid crystal display device can be prevented from becoming unstable.

According to the electric / electronic device of the present invention, since the liquid crystal display device according to any one of the first to sixth aspects is provided, the EMI between the electric / electronic device and another electric / electronic device can be improved.
Has the effect of being able to suppress Thereby, EM
It is possible to adapt to various laws and regulations of I at an early stage, and thus to accelerate the entry of electric and electronic devices to the market.

After the product design of the electric / electronic equipment,
Since it is not necessary to newly provide a member or a shielding structure for the I measure, there is an effect that the cost for the EMI measure can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a liquid crystal driving substrate of a liquid crystal display device according to Embodiment 1 of the present invention.

FIG. 2 is an exploded perspective view showing another configuration of the liquid crystal driving substrate according to the first embodiment.

FIG. 3 is a perspective view showing a mounting structure of a liquid crystal driving substrate on a liquid crystal panel in the liquid crystal display device according to the first embodiment.

FIG. 4 is a perspective view showing a mounting structure of a liquid crystal driving substrate in a liquid crystal display device according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing another mounting structure of the liquid crystal driving substrate in the liquid crystal display device according to the second embodiment of the present invention.

FIG. 6 is a perspective view showing a mounting structure of a liquid crystal driving substrate on a liquid crystal panel in a liquid crystal display device according to a third embodiment of the present invention.

FIG. 7 shows a fixing screw 9a according to the second embodiment for supporting and fixing the liquid crystal driving substrate 1 to the metal reflecting plate 6 in FIG.
FIG. 9 is a perspective view illustrating a configuration performed by a screw hole 9b.

8 is a perspective view illustrating a configuration in which the liquid crystal driving substrate 1 in FIG. 6 is supported and fixed to the metal reflecting plate 6 by the fixing claws 10 according to the second embodiment.

FIG. 9 is a perspective view showing a mounting structure of a liquid crystal driving substrate on a liquid crystal panel in a liquid crystal display device according to Embodiment 4 of the present invention.

FIG. 10 is a perspective view showing an electric / electronic device according to Embodiment 5 of the present invention.

FIG. 11 is a sectional view showing a conventional liquid crystal display device.

FIG. 12 is a cross-sectional view showing a shield structure of a conventional electronic circuit.

[Explanation of symbols]

1, 1a LCD driving substrate, 2 component mounting surface, 2a signal line, 2b power supply, 3 grounding surface, 3a non-mounting surface (grounding surface), 4 liquid crystal display, 5 backlight, 6, 6a
Metal reflector (conductive reflector), 7 Liquid crystal panel, 8
Liquid crystal display device, 9a fixing screw (engaging screw portion, engaging portion), 9b screw hole (engaging screw hole, engaging portion), 10 fixing claw (claw portion, engaging portion), 11 substrate mounting guide (Mounting guide), 12 heat dissipation mechanism (heat dissipation means),
13 Electric and electronic equipment.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Chiharu Miyazaki 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Mitsuhiko Kanda 2-3-2 Marunouchi, Chiyoda-ku, Tokyo 3 F-term (reference) in Ryo Electric Co., Ltd.

Claims (7)

[Claims] A liquid crystal panel having a built-in liquid crystal display element;
A liquid crystal display device comprising: a liquid crystal driving substrate for driving the liquid crystal display element; and a conductive reflecting plate for reflecting incident light and supplying illumination to the liquid crystal panel, wherein the liquid crystal driving substrate has one surface. A component mounting surface, a ground surface on the other surface, and electrically connecting the ground surface and the conductive reflection plate, and supporting and fixing the conductive reflection plate from the component mounting surface side to the conductive reflection plate. Characteristic liquid crystal display device. An engaging portion provided on the liquid crystal driving substrate and / or the conductive reflection plate for supporting and fixing the liquid crystal driving substrate to the conductive reflection plate, and a ground plane via the engaging portion. 2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is electrically connected to the conductive reflection plate. 3. The liquid crystal display device according to claim 2, wherein the engaging portion comprises an engaging screw hole and an engaging screw portion. 4. The liquid crystal display device according to claim 2, wherein the engaging portion comprises a claw portion provided on the conductive reflection plate and engaging and fixing the liquid crystal driving substrate. 5. The liquid crystal display according to claim 1, further comprising: a mounting guide portion provided on the conductive reflection plate to determine a mounting position of the liquid crystal driving substrate.
The liquid crystal display device according to the item. 6. A heat radiation means provided on the conductive reflection plate and radiating heat generated from components mounted on the liquid crystal drive substrate. 2. The liquid crystal display device according to claim 1. 7. An electric / electronic device comprising the liquid crystal display device according to claim 1. Description: