JP4558915B2 - Liquid crystal display - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a large-sized liquid crystal display device used for, for example, airport flight information, outdoor advertisement, and the like, and more particularly, to a mounting structure of a backlight light source portion.
[0002]
[Prior art]
The large liquid crystal display device as described above has a configuration in which a large number of liquid crystal display units are arranged vertically and horizontally, for example, and constitutes one large screen as a whole. An example of the conventional liquid crystal display unit is shown in FIG.
[0003]
In the figure, a light diffusion plate 2 is provided on the back side of the liquid crystal panel 1, and a reflection case 3 is attached so as to cover the entire back side, and a light source 4 for a backlight is provided inside the reflection case 3. Several are arranged. Further, a circuit board 5 for driving the liquid crystal panel and a circuit board 6 for driving the light source are disposed on the back side of the reflection case 3. The liquid crystal panel 1 and its driving circuit board 5 are connected by a cable 7 such as a flexible cable or TAB, and each of the light sources 4 and its driving circuit board 6 are connected by a connection cable 8 or Or it is directly connected.
[0004]
Each liquid crystal display unit having such a configuration is fixed to a main body frame of the liquid crystal display device by a holding bracket or the like.
[0005]
[Problems to be solved by the invention]
As shown in FIG. 6, in the conventional liquid crystal display unit, the light diffusing plate 2, the reflection case 3, the backlight light source 4, and the circuit boards 5 and 6 are integrated with each other to form one unit (backlight unit). ).
[0006]
For this reason, for example, in the case of maintenance inspection, if it is desired to replace the light source 4 with a new one, it is necessary to replace the backlight unit in units.
If the light source 4 is to be changed to a different type of light source (for example, from a fluorescent lamp to an incandescent lamp), the entire liquid crystal display unit has to be replaced.
[0007]
In this case, in order to replace only the light source, it is necessary to replace all other parts as well, resulting in problems such as an increase in replacement costs and waste of resources.
[0008]
In view of the above-described conventional problems, an object of the present invention is to provide a liquid crystal display device capable of exchanging a backlight light source without waste and with good workability.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is configured as follows. That is, the liquid crystal display device of the present invention includes at least a liquid crystal panel, a first unit obtained by integrating a drive circuit unit for the liquid crystal panel, and a backlight reflection case, at least a plurality of backlight light sources , A second unit integrated with the light source driving circuit unit, and the second unit is detachable with a single touch with respect to the backlight reflecting case of the first unit. The light reflecting case has an opening for allowing the plurality of light sources for backlight to pass into the backlight reflecting case when the second unit is attached to the backlight reflecting case of the first unit. has, the opening der those characterized in that a slit shape corresponding to the respective positions of the light source of the plurality of backlights .
[0010]
With this configuration, if it is desired to replace the light source with a new one, the second unit including the light source and its drive circuit unit is maintained without changing the first unit including the liquid crystal panel and the reflection case. You only need to replace the unit. Therefore, only necessary portions can be easily replaced while suppressing replacement costs and waste of resources.
[0011]
Here, the second unit includes different types of backlight light sources (for example, cold cathode fluorescent tubes, hot cathode fluorescent tubes, light emitting diodes, CRT, EL (including inorganic and organic), incandescent lamps, etc.). It is desirable that a plurality of types be prepared, and any of the plurality of types of second units be configured to be detachable with a single touch to the backlight reflecting case of the first unit.
[0012]
With such a configuration, it is possible to easily manufacture a liquid crystal display device having an arbitrary backlight light source by selecting an arbitrary type from the second units prepared in a plurality of types. In addition, even during maintenance and inspection, it can be easily replaced with an arbitrary type according to the necessity or the user's request.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a liquid crystal display unit in a liquid crystal display device according to an embodiment of the present invention.
[0016]
The liquid crystal display unit shown in the figure is roughly composed of a first unit U1 and a second unit U2.
The first unit U1 includes a liquid crystal panel 11, a light diffusion plate 12 provided on the back side thereof, a reflection case 13 disposed so as to cover the entire back side, and a circuit board for driving the liquid crystal panel. 14 and a cable 15 for connecting the liquid crystal panel 11 and the circuit board 14, which are integrated with each other to constitute one unit.
[0017]
The second unit U2 includes a light source 16 for backlight and a circuit board 17 for driving the backlight. The light source 16 is integrated on the circuit board 17 to constitute one unit.
[0018]
The second unit U2 is detachable from the first unit U1. Specifically, as shown in FIG. 2, the second unit U2 is fitted into the back surface of the reflective case 13 of the first unit U1 with one touch. It is configured freely. This fitting structure adopts various structures, such as giving two units a concave-convex relationship with each other, or providing a claw in one unit and an engaging part with the claw in the other unit. Is possible.
[0019]
In this case, an opening for allowing the light source 16 to pass through the inside of the reflection case 13 when the second unit U2 is attached to the first unit U1 is provided on the back surface of the reflection case 13. For example, as shown in FIG. 3, this opening may be a slit-like opening 18 (hatched portion) corresponding to each position of each light source 16, or as shown in FIG. It may be an opening 19 (shaded portion) that forms one large opening that surrounds all of the above.
[0020]
In the case of the opening 18 shown in FIG. 3, the opening is formed only at a position corresponding to each light source 16, and the intermediate region is closed, so that it is possible to prevent dust from entering the reflecting case 13. . On the other hand, in the case of the opening 19 shown in FIG. 4, it is not necessary to consider the arrangement position of the light source 16, so that the structure is simple, and it is possible to easily deal with various types of light sources as will be described later.
[0021]
The second unit U2 described above is prepared in a plurality of types having different types of light sources as shown in FIG.
For example, the second unit U2 shown in FIG. 5A is provided with a fluorescent lamp or a cold cathode tube as the light source 16, and its circuit board 17 is an inverter for driving the fluorescent lamp or the cold cathode tube. Circuit. The second unit U2 shown in FIG. 5B includes a light source 16 that includes a single color, color, or RGB integrated light emitting diode (LED), and its circuit board 17 is a circuit for driving the light emitting diode. It has. The second unit U2 shown in FIG. 5C includes an incandescent lamp as the light source 16, and the circuit board 17 includes a circuit for driving the incandescent lamp. In addition, various types such as a light source 16 equipped with CRT or EL (electroluminescence) can be adopted.
[0022]
Each of the plurality of types of second units U2 is similarly configured to be detachable from the first unit U1. That is, the first unit U1 can be combined with any of the plurality of types of second units U2, and is shared.
[0023]
According to the liquid crystal display device according to the embodiment of the present invention described above, if the light source 16 is to be replaced with a new one, the first unit U1 is left as it is, and only the second unit U2 is replaced. Therefore, only necessary portions can be easily replaced while suppressing replacement costs and waste of resources.
[0024]
In addition, since a desired type can be selected from the second units U2 prepared in a plurality of types, a liquid crystal display device having a desired light source can be easily manufactured, and at the time of maintenance and inspection. Also, it can be easily exchanged for a desired type according to the necessity or the user's request.
[0025]
In addition, this invention is not limited to the said embodiment, In the range described in Claim 1, a various structure is employable.
[0026]
【The invention's effect】
According to the present invention, when replacing the light source with a new one, it is only necessary to replace the second unit that is detachable with respect to the first unit, so as to minimize replacement costs and waste of resources, Only necessary parts can be easily replaced.
[0027]
In addition, if an arbitrary type can be selected from a plurality of types of second units, a liquid crystal display device having an arbitrary light source can be easily manufactured. Will be able to be easily replaced with any type.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a liquid crystal display unit in a liquid crystal display device according to an embodiment of the present invention.
FIG. 2 is a schematic diagram showing a detachable configuration of a second unit U2 with respect to the first unit U1.
FIGS. 3A and 3B are schematic views illustrating an example of an opening provided on the back surface of the reflective case 13, wherein FIG. 3A is a plan view and FIG.
4A and 4B are schematic views showing another example of an opening provided on the back surface of the reflection case 13, wherein FIG. 4A is a plan view and FIG. 4B is a cross-sectional view along BB.
FIGS. 5A and 5B are schematic views showing a plurality of types of second units U2 having different types of light sources, wherein FIG. 5A shows a fluorescent light source or a cold cathode tube as a light source, and FIG. 5B shows an LED as a light source. (C) shows the thing provided with incandescent lamps as a light source.
FIG. 6 is a schematic configuration diagram of a conventional liquid crystal display unit.
[Explanation of symbols]
U1 1st unit U2 2nd unit 11 Liquid crystal panel 12 Light diffusing plate 13 Reflective case 14 Circuit board 15 for driving liquid crystal panel Cable 16 Light source for backlight 17 Circuit boards 18 and 19 for driving light source

Claims (3)

A first unit formed by integrating at least a liquid crystal panel, a driving circuit unit for the liquid crystal panel, and a backlight reflecting case;
At least, comprising a light source for a plurality of backlights and a second unit formed by integrating the drive circuit portion for the light source,
The second unit is detachable with one touch to the backlight reflecting case of the first unit,
The backlight reflection case allows the plurality of light sources for backlight to pass into the backlight reflection case when the second unit is attached to the backlight reflection case of the first unit. A liquid crystal display device having an opening, the opening having a slit shape corresponding to each position of the plurality of backlight light sources . A plurality of types of second units having different types of backlight light sources are prepared, and any of the plurality of types of second units is used as the backlight reflection case of the first unit. 2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is detachable with one touch .   3. The liquid crystal display device according to claim 2, wherein the different types of backlight light sources are at least one of a cold cathode fluorescent tube, a hot cathode fluorescent tube, a light emitting diode, a CRT, an EL, and an incandescent lamp. .

Images