JP2004144910A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal (LC) display device which is robust, with reduced thickness and with a circuit which is easily attached and detached and is easily connected to wiring. <P>SOLUTION: A base 31 is fixed to protrusions 21, 22 for fixing a rear surface of an LC module 1 in such a way that a principal surface 310 of the base is positioned closer to the rear surface side of the LC module than the flat plane formed by connecting tips of the protrusions. Circuit boards 32, 33 are fixed to the base 31. Also a digital substrate is arranged so as to approach an edge of the base. Adjusting means 35, 36 are arranged on an edge of the shoulder part 311 side. A terminal part 37 to give and receive signals is arranged along an edge of a through hole part 312 side. As a result, the substrate surface is arranged nearly at the same height as the tips of the protrusions for fixing and the thickness of the LC display device is reduced, although the circuit board has an analog-digital processing part and is attached to the rear surface of the LC module so as to protrude therefrom. Also the base and a substrate cover are unitized and consequently release of a circuit pattern on the fixed board and damage to a protruding component due to clash with a foreign object during conveyance does not occur and the LC display device is robust and further the circuit board is easily attached/detached and is easily connected to the wiring. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention particularly relates to a liquid crystal display device suitable for having a circuit board having an additional function.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a so-called liquid crystal module is configured to include a liquid crystal driver and a driver controller, and it is necessary to externally apply a signal specific to liquid crystal driving. However, such a configuration is convenient when only the device itself is used, such as a personal computer, or when the display is performed by connecting to another device via the device. When connecting to a device that directly outputs display signals (video signals), such as a measuring instrument, or when trying to display a TV signal instead of a CRT, the display signals are compatible with liquid crystal drive. Must be converted to a display signal.
[0003]
Since such a display signal processing board or the like lacks versatility when held in a device, it is preferably held externally to a liquid crystal module, and is fixed to, for example, the back of the liquid crystal module (see Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2001-272659
[Problems to be solved by the invention]
However, for backlighting in a liquid crystal module, a cold cathode ray tube or the like driven by an inverter is often used, and a reflector or the like is used to increase the light use efficiency. Therefore, in order to fix the circuit board to the liquid crystal module, consideration must be given to the electromagnetic effect of the inverter and the short circuit or discharge accident of the circuit board. In order to keep the illumination by the illumination means efficient and thin, especially in a large liquid crystal display, the shape of the illumination means is naturally determined to be flat. It is not preferable to process the outer shape of the illuminating means just because the circuit board is fixed because the illuminating efficiency is sacrificed. Therefore, it has been found that it is better to provide a projection (boss) for fixing the substrate on the back surface of the illuminating means and to fix the circuit board away from the reflector. In such a structure, the size of the circuit board is restricted due to the fixing protrusions, or the circuit board has many connection lines, so the work of mounting the board is complicated to secure workability such as terminal connection. It often happens. In addition, since it is mounted to protrude from the back of the liquid crystal module, the circuit pattern of the fixed board peels off, the protruding parts damage the other parts during transportation etc., or the liquid crystal display for the board parts The depth of the device was increased, which was inconvenient.
[0006]
[Means for Solving the Problems]
The present invention has been made in view of the above points, and a liquid crystal module in which lighting means having a plurality of fixing protrusions on the back surface are integrated with a back surface of a liquid crystal cell, and a circuit means fixed on the back surface of the liquid crystal module. The circuit means has a circuit board fixed on the base, and the base is raised from the main surface so as to cover the main surface along the back surface of the liquid crystal module and substantially the tip of the fixing projection, and the fixing is performed. And a through hole penetrating another fixing protrusion, so that the main surface of the base is located on the back side of the liquid crystal module from a plane formed by connecting the tips of the fixing protrusions. It is attached to.
[0007]
More preferably, a substrate cover fixed to the base is fixed to the fixing protrusion in the through-hole portion passing through the fixing protrusion of the base, and the circuit means includes an analog signal processing circuit portion and a digital signal processing circuit. And a processing circuit portion.
[0008]
Further, or alternatively, the circuit board is disposed closer to the through-hole side penetrating the fixing projection so as to have a gap between the step and the side of the circuit board on the step side of the base. In the side and the side on the through-hole side, there are a plurality of signal transmitting / receiving terminals along one side, and an adjusting means is provided along the other side.
[0009]
More preferably, the circuit board includes an analog board including a circuit for processing an analog signal, and a digital board including a digital signal processing circuit, and a terminal section for signal transmission and reception and an adjustment unit are provided on the digital board. Alternatively, the digital board is arranged on a side having a gap between the digital board and the step so that the adjusting means can be performed in the base, and the terminal section of the digital board for transmitting and receiving signals has an edge along one side of the base. The terminal portion is reinforced directly or indirectly by a guide arranged near the bent portion of the base or a substantially upright edge of the base.
[0010]
Further, the present invention provides a liquid crystal display device having a liquid crystal module comprising a liquid crystal cell and an illuminating means and having a plurality of fixing projections on the back surface, and a liquid crystal display device having circuit means fixed to the back surface of the liquid crystal module, wherein the circuit means Has a circuit board fixed on a base mounted so as to be located on the back side of the liquid crystal module from the plane formed by connecting the tips of the fixing projections, and the base covers a substantially end of the fixing projections Has a step portion provided at the corner, and a through-hole portion penetrating another fixing protrusion at the corner portion facing the step portion, and is fixed to the fixing protrusion at the step portion and the through-hole portion. The circuit board is fixed to another fixing protrusion with a component covering the circuit board fixed to the base, and is arranged as a circuit board at least toward the through hole side, and has an adjusting means on a side of the step side, and has a through hole side. Transfer of signals arranged along the side Those having a digital circuit board having a terminal portion.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a side sectional view of a liquid crystal display device according to an embodiment of the present invention. FIG. 2 is a perspective view of circuit means viewed from a direction A in FIG. 1, and FIG. 3 is a main part of the circuit means viewed from a direction B in FIG. FIG. 4 is a perspective view, and FIG. 4 is a plan view of the circuit means with the substrate cover (covering component) removed (excluding mounted electronic components such as integrated circuit elements and circuit patterns).
[0012]
In these figures, reference numeral 10 denotes a liquid crystal cell having driving elements (liquid crystal driver or the like: not shown) in the periphery. The present invention is particularly effective in a large screen in which the size of the liquid crystal cell 10 is 15 inches or more, more preferably 19 inches or more, on the effective screen. Reference numeral 11 denotes an illuminating unit having a plurality of fixing projections 21 and 22 on the back surface. The illuminating unit 11 has a large number of linear light sources 111 inside, is covered with a reflection surface 112, and is integrally formed on the back surface of the liquid crystal cell 10. The liquid crystal cell 10 and the illuminating means 11 may be configured to be separable, but both constitute the liquid crystal module 1. An inverter 113 for lighting the linear light source 111 is provided on the back surface of the reflection surface 112.
[0013]
The fixing projections 21 and 22 are made of, for example, a metal boss provided on a reflection surface of the lighting means 11 or a frame supporting the lighting means 11, and are columns having a height of 5 to 20 mm, and are tapped at the center (screw cut). Holes. The fixing protrusions are referred to as an upper fixing protrusion 21 and a lower fixing protrusion 22 for the sake of convenience. Each of the two fixing protrusions is composed of four protrusions. The height of the tip is adjusted so that one plane parallel to the back surface can be formed.
[0014]
Reference numeral 3 denotes circuit means fixed to the back surface of the liquid crystal module 1, and FIG. 2 shows a perspective view of the circuit means. The circuit means 3 includes a base 31, circuit boards 32 and 33, and a board cover (parts covering the board) 34, and can be made into a unit.
[0015]
The base 31 is a molded flat plate made of iron, aluminum, copper, a conductive resin molded plate, or the like, and has a planar main surface 310 having a relatively large area along the back surface of the liquid crystal module 1. 1, a step 311 is provided from the main surface 310 so as to cover substantially the distal end of the fixing projection 21. The step portion 311 has a fixing portion 3111 formed of a stop hole at a position corresponding to the tap hole of the fixing protrusion at the corner of the base 31, and the base 31 itself is fixed to the fixing protrusion 21 with a screw 3112 or the like. ing. The step portion 311 may be provided to be long along one upper side as shown in the figure. However, since the fixing projections 21 are arranged so as to correspond to the corners of the base 31, only the fixing portion 3111 is cut and raised. You may comprise a part.
[0016]
In addition, as shown in FIG. 3, the base 31 has a through-hole 312 that penetrates another fixing projection 22 in the lower surface of the base 31 as shown in FIG. Thus, the main surface 310 of the base 31 is attached so as to be located on the back side of the liquid crystal module from a plane formed by connecting the tips of the fixing projections 21 and 22. In the through-hole portion 312 penetrating the fixing protrusion of the base 31, the board cover 34 fixed to the base 31 is fixed to the fixing protrusion 22 with a screw 3113 or the like in the bent tongue piece 341.
[0017]
As described above, one of the bases 31 is directly disposed and fixed on the fixing projection 21, and thus can be firmly supported. Further, since the other side of the base 31 is disposed below the fixing projection 22, the thickness of the entire device can be reduced, and further, an opening space for a signal transmission / reception terminal portion described later can be secured. Further, since the unit can be formed around the base 31 together with the substrate cover 34, electromagnetic shielding is possible.
[0018]
The circuit means 3 includes an analog signal processing circuit portion such as an analog RGB signal receiving portion, a video signal receiving portion, a video signal decoder, a digital signal processing circuit portion such as a digital signal receiving portion and a digital video signal transmitting portion, and an A / D converter. , And a circuit for processing both analog and digital signals, such as a scaler, and basically comprises a circuit for processing a signal sent from another device into a signal suitable for display on a liquid crystal module. Therefore, the circuit board fixed to the base 31 has an analog board 33 composed of a circuit for processing an analog signal and a digital board 32 having a digital signal processing circuit. In particular, in the digital board 32, a signal transmitting / receiving terminal 37 such as an RS232C terminal, a net terminal, and a switching board interface terminal and a signal transmitting / receiving or signal processing station adjusting means such as a temperature and air conditioning sensor terminal, a bit select, and a termination select switch. 35 and 36 are provided. The means for adjusting the signal transmission / reception or the signal processing field may be constituted by a connector 35 such as a sensor or a switch 36 such as a slide switch or a toggle switch, instead of the sensor itself.
[0019]
The circuit board, especially the digital board 32, has a through-hole penetrating through the fixing projection so that a gap is provided between the step 311 and the side 323 of the circuit board at the end of the base 31 on the side of the step 311. It is arranged close to the part 312 side. A gap is provided between the step 311 and the step 311 so that the adjusting means 35 and 36 can be performed in the base 31, that is, a switch operation, a connector connection, or a wiring fixing. Are arranged on the side 323 having a work space such as the above, so that the adjusting means 35 and 36 can be operated or connected with the start of use or the change of the use condition. On the other hand, the signal transmission / reception terminal 37 of the digital board 32 is disposed near the edge along one side 313 of the base 31, and is provided with a bent portion of the base 31 or a guide 38 provided substantially upright on the edge of the base 31. The terminal portion 37 is reinforced. In this way, the space of the base 31 is made lower than the board position to effectively utilize the space with the board cover 34 that covers the board, to facilitate connection with other devices such as a VTR, and to prevent the cord and the like from being pulled. Terminals can be protected.
[0020]
As described above, the liquid crystal module 1 includes the liquid crystal cell 10 and the illuminating means 11 and has the plurality of fixing projections 21 and 22 on the back surface, and the circuit means 3 fixed on the back surface of the liquid crystal module 1. The circuit means 3 has circuit boards 32 and 33 fixed on a base 31 attached such that the main surface 310 is located on the back side of the liquid crystal module from a plane formed by connecting the tips of the fixing projections. . Further, the base 31 has a stepped portion 311 provided at a corner thereof with a fixing portion covering substantially the distal end of the fixing protrusion 21, and a through-hole portion 312 penetrating another fixing protrusion 22 at a corner facing the stepped portion 311. And The step 311 is fixed to the fixing protrusion 21 and is fixed to the fixing protrusion 22 by a tongue piece 341 of the board cover 34 covering the circuit board fixed to the base 31 at the through hole 312. Further, the circuit board 32 is arranged at least to the side of the through-hole portion 312, has adjusting means 35 and 36 on the side of the step portion 311 side, and has a signal transmission / reception terminal portion arranged along the side of the through-hole portion 312. There is a digital board with 37.
[0021]
In the above-described embodiment, the tongue piece 341 of the board cover 34 is screwed to the fixing protrusion 22 penetrating the base 31. However, as shown in FIG. The tongue piece 314 may be formed and fixed to the tip of the fixing projection 22 penetrating the base 31. In this case, the board cover 34 is fixed to the base 31 at another position using screws or the like.
[0022]
【The invention's effect】
With such a configuration, while the liquid crystal display device of the present invention has an analog / digital processing unit, the circuit board is mounted so as to protrude from the rear surface of the liquid crystal module, but the substrate surface has substantially the same height as the tip of the fixing projection. It is thin. In addition, since the base and the board cover can be used as a unit, the circuit board on the fixed board does not peel off, and the protruding parts do not damage other parts during transportation etc. It is easy to attach / detach / wire connection.
[0023]
The adjusting means 35 and 36 of the digital board 32 are arranged on the side 323 facing the step 311 so that adjustment and the like can be performed in the base 31. On the other hand, one side 323 of the digital board 32 is arranged near the edge of the base 31 so as to be along the edge, and the signal transmitting / receiving terminal 37 is located near the side 323 of the digital board 32 along the base edge. It is provided in. Further, the terminal portion is reinforced directly or indirectly by a guide 38 provided substantially upright on the bent portion of the base or the edge of the base. With these configurations, the arrangement of the terminals and the adjusting means can be easily connected and adjusted, and the necessary wiring processing and the like can be easily performed, and the wiring material can be extremely bent and the connector can be stressed without any stress.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a liquid crystal display device according to an embodiment of the present invention.
FIG. 2 is a perspective view of circuit means viewed from a direction A in FIG.
FIG. 3 is a perspective view of a main part of the circuit means viewed from a direction B in FIG. 1;
FIG. 4 is a plan view of the circuit means with a substrate cover (covered component) removed (excluding mounted electronic components such as integrated circuit elements and circuit patterns).
FIG. 5 is a perspective view of a main part showing another embodiment of the circuit means.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Liquid crystal module 10 Liquid crystal cell 11 Lighting means 21 and 22 Fixing projection 3 Circuit means 31 Base 310 Main surface 311 Step 312 Through-hole 32, 33 Circuit board 35, 36 Adjusting means 37 Terminal part

Claims (7)

In a liquid crystal display device having a liquid crystal module in which lighting means having a plurality of fixing projections on a back surface are integrated with a back surface of a liquid crystal cell, and a liquid crystal display device having circuit means fixed to the back surface of the liquid crystal module, the circuit means is provided on a base. The base is raised from the main surface so as to cover a main surface along the back surface of the liquid crystal module and substantially the tip of the fixing protrusion, and is fixed to the fixing protrusion. And a through-hole portion penetrating another fixing projection, wherein the main surface of the base is located on the back side of the liquid crystal module from a plane formed by connecting the tips of the plurality of fixing projections. A liquid crystal display device characterized by being mounted as described above. In a liquid crystal display device having a liquid crystal module in which lighting means having a plurality of fixing projections on a back surface are integrated with a back surface of a liquid crystal cell, and a liquid crystal display device having circuit means fixed to the back surface of the liquid crystal module, the circuit means is provided on a base. The base is raised from the main surface so as to cover a main surface along the back surface of the liquid crystal module and substantially the tip of the fixing protrusion, and is fixed to the fixing protrusion. And a through-hole portion penetrating another fixing projection, wherein the main surface of the base is located on the back side of the liquid crystal module from a plane formed by connecting the tips of the plurality of fixing projections. In the liquid crystal display device, the substrate cover fixed to the base is fixed to the fixing protrusion in the through-hole portion so attached and penetrating the fixing protrusion of the base. 2. The liquid crystal display device according to claim 1, wherein said circuit means has an analog signal processing circuit portion and a digital signal processing circuit portion. The circuit board is disposed closer to the through-hole side penetrating the fixing protrusion so as to have a gap between the step portion and the circuit board on the side of the base portion on the step portion side. Wherein a plurality of signal transmission / reception terminals are provided along one side and an adjustment means is provided along the other side on the side of the step portion and the side on the side of the through hole. Item 3. A liquid crystal display device according to item 2. The circuit board includes an analog board including a circuit for processing an analog signal and a digital board including a digital signal processing circuit, and the signal transfer terminal unit and the adjustment unit are both provided on the digital board. The liquid crystal display device according to claim 4, wherein: The adjusting means of the digital board is arranged on a side toward the step so that adjustment and the like can be performed in the base, and one side of the digital board is near the edge of the base and along the edge. The signal transmission / reception terminal portion is provided near a side along the base edge of the digital substrate, and is directly or indirectly provided by a bent portion of the base or a guide provided substantially upright on the base edge. 6. The liquid crystal display device according to claim 5, wherein the terminal portions are reinforced. In a liquid crystal display device having a liquid crystal module comprising a liquid crystal cell and an illuminating means and having a plurality of fixing projections on a rear surface, and a liquid crystal display device having circuit means fixed to the rear surface of the liquid crystal module, the circuit means has a main surface for fixing It has a circuit board fixed on a base attached so as to be located on the back side of the liquid crystal module from a plane formed by connecting the tips of the projections, and the base has a fixing portion covering the almost end of the fixing projection. A step portion provided on the portion, and a through-hole portion which penetrates another fixing protrusion at a corner facing the step portion, and is fixed to the fixing protrusion at the step portion and the through-hole portion. The circuit board is fixed to the fixing projection with a component covering the circuit board fixed to the base.The circuit board is arranged at least on the side of the through-hole portion, has an adjusting means on the side of the step portion side, and has the adjusting portion on the side of the through-hole portion. Signals placed along sides The liquid crystal display device characterized by having a digital circuit board having a terminal portion of the receiving.

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