JP3693782B2 - Liquid crystal display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device, for example, a backlight type liquid crystal display device.
[0002]
[Prior art]
For example, a backlight type liquid crystal display device has a light source device disposed on the back surface of the liquid crystal display panel, and controls the light transmittance of each pixel arranged in a matrix on the display surface of the liquid crystal display panel. An image can be recognized by the light from the light source device irradiated through the liquid crystal display panel.
[0003]
In such a liquid crystal display device, specifically, a metal frame that exposes the display surface of the liquid crystal display panel is used as an envelope, and in addition to the liquid crystal display panel, the liquid crystal display is included in the frame. A driving circuit for driving a panel, a light source device disposed on the back surface of the liquid crystal display panel, and a circuit for supplying driving pulses to the driving circuit and a circuit for supplying power to the light source device are integrated (module) To be configured.
[0004]
[Problems to be solved by the invention]
In the liquid crystal display device configured as described above, a drive circuit included in a metal frame or a circuit for supplying a drive pulse to the drive circuit is assembled by a fine and precise processing technique. It is desirable that the structure be free from vibrations and shocks so that it is not damaged.
[0005]
However, for example, when a connector to be connected to a PC (personal computer) main body or the like is mounted, an impact or the like at that time is transmitted to the printed circuit board and the like, and the electronic component mounted on the printed circuit board and other components are bent. Problems such as damage to connections with electronic components have been pointed out.
[0006]
Such a situation is the same in the process of assembling the above-described configuration of the liquid crystal display device, and careful attention has been required in the work.
[0007]
The present invention has been made based on such circumstances, and an object thereof is to provide a liquid crystal display device having improved resistance to vibration and impact.
[0008]
[Means for Solving the Problems]
Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
[0009]
Means 1.
A liquid crystal display panel disposed in a frame; a printed circuit board disposed in at least a part of a peripheral portion of the liquid crystal display panel; and a light source device disposed on a back surface of the liquid crystal display panel. ,
In the liquid crystal display device in which a connector is mounted on the surface of the printed circuit board on the light source device side,
Means are provided between the surface of the printed circuit board opposite to the side on which the connector is mounted and the frame so that the printed circuit board can be prevented from being bent toward the frame side when the connector is mounted. It is characterized by this.
[0010]
Mean 2.
In a liquid crystal display device including a liquid crystal display panel disposed in a frame, a printed circuit board disposed in at least a part of a peripheral portion of the liquid crystal display panel, and a light source device disposed on the back surface of the liquid crystal display panel ,
The ground terminal on the printed circuit board and the frame are electrically connected by a flexible conductive wire.
[0011]
Means 3.
A liquid crystal display panel disposed in a frame; a printed circuit board disposed in at least a part of a peripheral portion of the liquid crystal display panel; and a light source device disposed on a back surface of the liquid crystal display panel. ,
The light source device includes a light guide plate disposed to face the liquid crystal display panel, and a light source on a line disposed on a side end surface side of at least one side of the light guide plate. In the liquid crystal display device in which the other is drawn out to the connector through the wiring that bypasses the periphery of the light guide plate with respect to the one,
The wiring drawn out from one electrode of the light source to the connector is formed with a slacker than the wiring drawn out from the other electrode to the connector.
[0012]
In the liquid crystal display device configured as the means 1, even if a connector (for example, a connector connected to the PC main body) is mounted on the printed board, the printed board can be prevented from being bent at that time. For this reason, it becomes possible to avoid the trouble caused by the bending of the electronic component mounted on the printed circuit board.
[0013]
In the liquid crystal display device configured as means 2, the printed circuit board is not connected to the frame with a material having a large rigidity, so even if any external force is applied to the frame, this force is not affected. There is no direct transmission to the printed circuit board. For this reason, it becomes possible to avoid the trouble caused by the force on the electronic component mounted on the printed circuit board.
[0014]
In the liquid crystal display device configured as the means 3, even if the connector is pulled strongly, the force is only applied to the wiring on the side of the light guide plate and hardly applied to the other wiring. . This means that a large burden is not applied to the connection portion of the other electrode of the light source with the wiring. Further, even if a large force is applied to the wiring that bypasses the light guide plate, it is absorbed by the corners of the light guide plate and the connection portion of the other electrode of the light source with the wiring is not burdened. For this reason, the damage etc. which arise in the connection part with the wiring in each electrode of a light source can be avoided now.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a liquid crystal display device according to the present invention will be described below with reference to the drawings.
[0016]
Overall configuration of liquid crystal display device Fig. 2 is an exploded perspective view of the liquid crystal display device according to the present invention.
[0017]
In the figure, first, there is a liquid crystal display panel 1. The liquid crystal display panel 1 uses a pair of glass substrates disposed opposite to each other with liquid crystal as an envelope, and a central portion excluding a peripheral portion having a slight width functions as a display surface. It has become. The display surface of the liquid crystal display panel 1 is composed of an aggregate of pixels arranged in a matrix, and the light transmittance in each pixel is made by supplying a display drive signal from an external terminal provided in the peripheral portion. It has become so.
[0018]
On the other hand, a printed circuit board 2 is arranged on three sides of the peripheral part of the liquid crystal display panel 1, and the display panel is interposed between the printed circuit board 2 and the liquid crystal display panel 1. A driving IC 3 for driving the display is arranged on the crotch.
[0019]
The drive IC 3 is a semiconductor device formed by, for example, a tape carrier method, and its output terminal is connected to the external terminal of the liquid crystal display panel 1, and its input terminal is connected to a terminal on the printed circuit board 2. It has become.
[0020]
A circuit for supplying drive pulses to the drive IC 3 and a circuit for supplying power to the light source device 6 described later are mounted on the printed circuit board 2.
[0021]
As described above, the integrated product of the liquid crystal display panel 1, the drive IC 3, and the printed circuit board 2 is arranged on the mold frame 4 so that the respective positions are maintained as they are. Here, the mold frame 4 has a shape as a frame having a portion opened so that light from a light source device 6 described later can be irradiated to at least a region corresponding to the display surface of the liquid crystal display panel 1. .
[0022]
A light source device 6 is disposed on the back surface of the mold frame 4 via prism sheets 5A and 5B.
[0023]
The light source device 6 includes a light guide plate 6A having a size corresponding to at least the display surface of the liquid crystal display panel 1, a cold cathode ray tube 6B disposed on a side end surface on one side of the light guide plate 6A, and the cold cathode ray tube 6B. And a reflection plate 6C for guiding the light from the side end surface of the light guide plate 6A.
[0024]
A part of the light from the cold cathode ray tube 6B is directly reflected on the side end face of the light guide plate 6A, and the remaining part is reflected by the reflecting plate 6C and is incident on the side end face of the light guide plate 6A. The light is emitted from the surface facing the liquid crystal display panel 1 while being totally reflected. For this reason, there is a case where a reflection plate for making the total reflection effective is disposed on the surface of the light guide plate 6A opposite to the surface facing the liquid crystal display panel 1.
[0025]
Then, the metal upper frame 7A covering the liquid crystal display panel 1 side and the metal lower frame 7B covering the light source device 6 side are coupled by, for example, caulking or the like, whereby each member described above is attached to the frame 7. It is supposed to be included. Here, the upper frame 7A has a shape as a frame so as to expose the display surface of the liquid crystal display panel 1 and cover the periphery thereof.
[0026]
Configuration of upper frame Fig. 1 is a cross-sectional view taken along line I-I in Fig. 2.
[0027]
In the figure, an interface connector 8 is attached to the printed circuit board 2 on the surface on the light guide plate 6A side. The interface connector 8 is a connector for supplying a signal from a PC (personal computer) main body to the printed circuit board 2 side, for example, and is usually attached to the interface connector 8 from a direction perpendicular to the printed circuit board 2. .
[0028]
The printed circuit board 2 is attached to the upper frame 7A between the upper frame 7A on the surface of the printed circuit board 2 corresponding to the portion to which the interface connector 8 is fixed. Means are provided that can suppress bending to the side.
[0029]
Specifically, as shown in the figure, a spacer 9 made of a relatively hard material is fixed on the surface on the upper frame 7A side of the printed circuit board 2 corresponding to a portion to which the interface connector 8 is fixed, The upper frame 7A is formed with a recessed portion 7a that contacts the spacer 9.
[0030]
With this configuration, when the interface connector 8 is mounted, the force required for the interface connector 8 can sufficiently counteract the force from the upper frame 7A via the spacer 9, so that the printed circuit board 2 is not bent.
[0031]
If the printed circuit board 2 is not bent, the force is not transmitted to the drive IC 3 side, so that the connection of the drive IC 3 to the printed circuit board 2 is not peeled off.
[0032]
For this reason, the spacer 9 does not necessarily have to be attached, and the depth of the recessed portion 7a formed in the upper frame 7A is made relatively large so that the recessed portion 7a directly contacts the printed circuit board 2. By adopting such a configuration, the same effect can be achieved.
[0033]
Further, the same effect can be obtained even if the height of the spacer 9 is configured to be large so that the upper frame 7A is in direct contact with the spacer 9 without forming the recessed portion 7a. become.
[0034]
Configuration of Printed Circuit Board and Upper Frame A ground terminal is formed on the printed circuit board 2, and the ground terminal is electrically connected to the upper frame.
[0035]
FIG. 3 is a perspective view showing this state, and shows details of the lower right corner of the liquid crystal display device shown in FIG.
[0036]
As shown in FIG. 3, in this embodiment, in the electrical connection between the ground terminal 2 </ b> A of the printed circuit board 2 and the upper frame 7 </ b> A, a conductive wire 10 having relatively flexibility is used. Between one end where the connection (for example, soldering) is made with the printed circuit board 2 and the other end where the connection (for example, the soldering) is made with the upper frame 7A is arranged in a relaxed state.
[0037]
With this configuration, when any force is applied to the frames 7A and 7B, the force is not transmitted to the printed circuit board 2.
[0038]
Incidentally, conventionally, the electrical connection between the ground terminal of the printed circuit board and the upper frame is performed by soldering the claw portion formed on the upper frame directly to the ground terminal of the printed circuit board.
[0039]
In such a configuration, when some force is applied to the frame, the force is directly transmitted to the printed circuit board through the claw portion, which causes a problem of connection peeling of the driving IC due to the bending of the printed circuit board. .
[0040]
Configuration of the cold cathode ray tube lead-out cable As shown in Fig. 2, the cold cathode ray tube 6B is composed of a linear tube body arranged along the side end surface of one side of the light guide plate 6A, and is provided at both ends thereof. An electrode is provided. The one electrode is directly pulled out to the connector 13 through the wiring 12A. On the other hand, from the other electrode, the light guide plate 6A is routed around the light guide plate 6A by the wiring 12B and is led out to the connector 13.
[0041]
In this case, in this embodiment, the wiring 12A directly drawn out from one electrode of the cold cathode ray tube 6B to the connector 13 has a slacker 14 than the wiring 12B drawn out to the connector 13 by bypassing the light guide plate 6A from the other electrode. It is formed to stand up.
[0042]
FIG. 4 is a perspective view showing the upper right corner of the liquid crystal display device shown in FIG. 2, and shows the wirings 12 </ b> A and 12 </ b> B and the connector 13 drawn through the mold frame 4.
[0043]
The connector 13 is mounted on the printed circuit board 2 so that power is supplied from the power circuit mounted on the printed circuit board 2 to the cold cathode ray tube 8B.
[0044]
In the liquid crystal display device configured as described above, even if the connector 13 is pulled strongly, the force is only applied to the wiring 12B on the side of the light guide plate 6A and almost applied to the other wiring 12A. There will be nothing. This means that a large burden is not applied to the connection portion of the other electrode of the light source with the wiring 12A. Even if a large force is applied to the wiring 12B on the side of the light guide plate 6A, it is absorbed by the corners of the light guide plate 6A, and a large portion is connected to the wiring 12B in the other electrode of the cold cathode ray tube 6B. There will be no burden. For this reason, the damage etc. which arise in the connection part with wiring 12A, 12B in each electrode of the cold cathode ray tube B can be avoided.
[0045]
【The invention's effect】
As is apparent from the above description, the liquid crystal display device according to the present invention can improve resistance to vibration and impact.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part showing an embodiment of a liquid crystal display device according to the present invention.
FIG. 2 is an exploded perspective view showing an embodiment of a liquid crystal display device according to the present invention.
FIG. 3 is a cross-sectional view of an essential part showing another embodiment of the liquid crystal display device according to the present invention.
FIG. 4 is a cross-sectional view of an essential part showing another embodiment of the liquid crystal display device according to the present invention.
[Explanation of symbols]
2A: Earth terminal, 7A: Upper frame, 7a: Recessed part, 8: Interface connector, 9 ... Spacer, 10 ... Conductive wire, 12A, 12B ... Wiring, 13 ... Connector, 14 ... slack.

Claims (4)

A liquid crystal display panel disposed in a frame; a printed circuit board disposed in at least a part of a peripheral portion of the liquid crystal display panel; and a light source device disposed on a back surface of the liquid crystal display panel. ,
In a liquid crystal display device in which a connector is mounted on the surface of the printed circuit board on the light source device side,
Wherein a spacer between the frame and the opposite surface to the side where the connector of the printed circuit board is mounted,
The liquid crystal display device , wherein the spacer and the connector overlap at least partially when viewed in a plan view. 2. The liquid crystal display device according to claim 1, wherein the frame has no recessed portion in a region where the spacer and the connector overlap when viewed in a plan view. A liquid crystal display panel disposed in a frame; a printed circuit board disposed in at least a part of a peripheral portion of the liquid crystal display panel; and a light source device disposed on a back surface of the liquid crystal display panel. ,
In a liquid crystal display device in which a connector is mounted on the surface of the printed circuit board on the light source device side,
A spacer is provided between the surface of the printed circuit board opposite to the side on which the connector is mounted and the frame;
The frame has a recess protruding toward the spacer,
When viewed in plan, the spacer and the connector overlap at least partially,
When viewed in a plan view, the liquid crystal display device is characterized in that a region where the spacer and the connector overlap and the recessed portion overlap at least partially. A liquid crystal display panel disposed in a frame; a printed circuit board disposed in at least a part of a peripheral portion of the liquid crystal display panel; and a light source device disposed on a back surface of the liquid crystal display panel. ,
In a liquid crystal display device in which a connector is mounted on the surface of the printed circuit board on the light source device side,
The frame has a recess protruding to the printed circuit board side,
The recessed portion is in contact with the printed circuit board on the surface opposite to the side on which the connector of the printed circuit board is mounted,
When viewed in a plan view, the liquid crystal display device is characterized in that a region where the recessed portion is in contact with the printed circuit board and the connector overlap at least partially.

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