JP2800752B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having a backlight mechanism.

[0002]

2. Description of the Related Art A conventional liquid crystal display device 50 is shown in FIG.
The liquid crystal display device 50 mainly includes a liquid crystal display panel 51, a backlight mechanism 52 provided on the back side of the liquid crystal display panel 51 (the side opposite to the display surface), and a housing 53 for housing these components. It is composed of

[0003] The backlight mechanism 52 is
A light source 54, a light guide plate 55 having a light incident surface 55 </ b> A for receiving irradiation light from the light source 54 and a light emitting surface 55 </ b> B for emitting light by receiving light, and a light incident surface 55 A side of the light guide plate 55 for emitting light from the light source 54. And a reflection plate 56 that concentrates on the

[0006] That is, as shown in FIG. 6, the light source 54 and the light incident surface 55 A of the light guide plate 55 are disposed inside the housing 53 in a state of being close to each other.
From the light guide plate 55, this irradiation light is reflected on each surface in the light guide plate 55, and each of these surfaces is in a light emitting state. The light guide plate 55 and the liquid crystal display panel 51 are fixedly equipped with one of the light emitting surfaces as a light emitting surface 55B, with the back surface of the liquid crystal display panel 51 facing the light emitting surface 55B.

That is, a configuration is adopted in which the liquid crystal display panel 51 is illuminated from the back side by light emission from the light emitting surface 55B.

[0006]

However, in the above-mentioned conventional example, the liquid crystal display panel and the light source of the backlight mechanism are held at predetermined positions, and the liquid crystal display panel and the light guide plate are maintained due to external force and dust. A housing for storing the backlight mechanism was required.

For this reason, the conventional liquid crystal display device requires operations such as mounting and adjustment of the light guide plate and the liquid crystal display panel with respect to the housing at the time of production. The weight is affected, and it is difficult to reduce the thickness and weight of the entire apparatus.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the disadvantages of the prior art and to provide a light and thin liquid crystal display device.

[0009]

According to a first aspect of the present invention, there is provided a liquid crystal display device comprising: a transmission type liquid crystal display panel; and a backlight mechanism disposed on the back side of a display surface of the liquid crystal display panel. , Backlight mechanism , liquid crystal display
A light guide plate having a light source having substantially the same length as the width of the display panel, a light incident surface on which irradiation light from the light source enters, and a light emitting surface for emitting light by the incident light;
And a reflector that concentrates on the launch surface.

Then, a liquid crystal is placed on the light emitting surface of the light guide plate.
The size of the LCD panel along the periphery of the display panel
A groove corresponding to the shape is provided, and a part of this groove is
The light guide plate, and the light inside all the surfaces of the light guide plate.
Except for the part inside the groove of the entrance surface or light emission surface,
The structure of coating with a film is adopted.

In the above configuration, the light source and the reflection plate are housed and held in the housing groove of the light guide plate constituting the backlight mechanism, and irradiation light is emitted from the light source to the inner wall surface of the housing groove.

Then, conduction is established from the inner wall surface of the storage groove.
Irradiation light incident on the plate covers each surface inside the conductive plate
From the light emitting surface to the outside of the conductive plate
Will be released.

[0013] That is, this releasing, the liquid crystal display panel is adapted to receive the irradiation of the irradiation light from behind the display surface.

According to a second aspect of the present invention, the liquid crystal display panel has the same configuration as the first aspect of the invention, and
The light guide plate is mounted on the light guide plate via a pressing member having substantially the same size as the light guide plate.

The holding member integrally holds the liquid crystal display panel from the periphery thereof with the light guide plate such that a portion corresponding to the display surface on the back surface of the liquid crystal display panel faces the light emitting surface of the light guide plate. It has become.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 1 to 3 illustrate the present invention.
It is an explanation example for performing. In this description example, for example, a liquid crystal display device 10 provided as display means of a small computer or the like is shown.

[0017] The liquid crystal display device 10 includes a transmission type liquid crystal display panel 1 of a backlight mechanism 2 disposed on the back side of the display surface of the liquid crystal display panel 1, the liquid crystal display panel 1
And a pressing member 3 fixedly mounted on a light guide plate 22 described later.

[0018] In detail each section, first, the backlight mechanism 2 includes a light source 21, a light emitting surface for emitting light by receiving the light incident surface 22A and the light incident surface 22A for receiving the light emitted from the light source 21 A light guide plate 22 having 22B;
A reflection plate 23 having a U-shaped cross section for concentrating irradiation light from the light source 21 on the light incident surface 22A side is provided.

[0019] The above light source 21 is a cylindrical fluorescent lamps, its axial length is set to substantially the same as one of the width of the liquid crystal display panel 1, further, the direction along its axial length It emits light of uniform brightness.

The light guide plate 22 is made of, for example, a highly transparent acrylic resin or the like. As shown in FIG. 3, the light guide plate 22 is provided around the liquid crystal display panel 1 according to the size and shape of the liquid crystal display panel 1 as shown in FIG. Four grooves are provided in a square shape. One of the grooves is a storage groove 22C for the light source 21, which is set to a size capable of storing the light source 21 and the reflection plate 23.

Furthermore, the receiving groove 22C, as shown in FIG. 2, has become the right wall surface of the interior wall surface and the light incident surface 22A, the reflecting plate 23, and its opening the light incident surface 22A side It is arranged toward. By providing the light source 21 and the reflection plate 23 inside the storage groove 22C, it is possible to effectively eliminate the influence of external force, dust, and the like.

Further , of the four grooves, the remaining three grooves 22D
Is set to be narrower than the storage groove 22C, and its inner wall surface functions as a reflection surface. That is, the light incident surface 2
Irradiation light entering the inside of the light guide member 22 from 2A is emitted from the light emitting surface 22B while transmitting and reflecting on each surface. In such a case, by providing these grooves 22D, the irradiation light is reflected on the inner wall surface of each groove 22D opposed to the light source 21, so that the light is reflected beyond the respective grooves 22D (that is, outside the range of the liquid crystal display panel 1). In this configuration, the irradiation light is suppressed from diffusing to the light emitting surface 22B, and the amount of light emitted from the light emitting surface 22B is increased.

Next, to describe the pressing member 3,
The holding member 3 is set to be substantially the same size as the light guide plate 22, and has a window 3 </ b> A having substantially the same size as the liquid crystal display panel 1.
Is provided. That is, the liquid crystal display panel 1 is mounted on the light guide plate 22 via the holding member 3 with its display surface corresponding to the window 3A. By attaching the holding member 3 to the light guide plate 22, the light source 21, the reflection plate 23, the storage grooves 22C and the respective grooves 22D are shielded from the outside. This makes it possible to more effectively eliminate the influence of external force, dust, and the like on these components.

Next, the operation of the liquid crystal display device 10 consisting of the components described above.

When irradiation from the light source 21 is performed, irradiation light enters the light guide plate 22 from the light incident surface 22A, and a part of the irradiation light is applied to each surface of the light guide plate 22 inside the light guide plate 22. Is transmitted, and a part is reflected and emitted from the light emitting surface 22B to the outside while repeating these.

[0026] Thus, the liquid crystal display panel 1 opposite to the light-emitting surface 22B is to read by irradiation light from the back side of the display surface, the display contents on the display surface when the display surface becomes brighter Is possible.

As described above, in this embodiment , the light guide plate 22
Is provided with a storage groove 22C, and the light source 2 is provided in the storage groove 22C.
1 and the reflection plate 23 are housed, so that external influences such as external force and dust can be reduced. For this reason, it is not necessary to add the housing as a new configuration and to accommodate each of the above-described components in the housing, thereby preventing the entire device from being enlarged by the housing and making the entire device thinner and lighter. It has become.

Further , since three grooves 22D are provided at locations corresponding to the periphery of the liquid crystal display panel 1 in accordance with the shape and size of the display surface of the liquid crystal display panel, the irradiation light from the light source 21 can emit light from the light guide plate. The light guide plate 22 is prevented from diffusing from the range of the liquid crystal display panel 1 inside the light guide plate 22, so that the irradiation light from the light source 21 is not impaired to the other.
It is possible to increase the amount of light emitted from the light emitting surface 22B.

[0029] Here, a theory about an embodiment of the present invention
I will tell. The present embodiment, when compared with the above-described example,
The light guide plate 22 has such characteristics. Other structures
The configuration is the same as the above-described example,
The same effect as the example is provided, and the effect of the light guide plate 22 is provided.
have. As shown in FIG. 4, the light guide plate 22 may be configured such that all surface portions except the light incident surface 22 </ b> A and the light emission surface 22 </ b> B are covered with a reflective film 30 that reflects toward the inside of the light guide plate 22. As this reflection film, for example,
The light guide plate 22 is formed by performing aluminum deposition or the like on the surface.

[0030] The reflective film 30, the irradiation light incident from the light incident surface 22A is to be reflected on the inside without leaking from the surface of the light guide plate 22 to the outside efficiently the light emitting surface 22B with less loss It is possible to emit light.

A new light source may be provided in any of the grooves 22D provided on three sides. In such a case, the width of the groove needs to be set to a size that can accommodate the light source. By providing this new light source,
As a result, the light emitting surface 22B can be made to emit light brightly, whereby the display surface of the liquid crystal display panel 1 can be illuminated more brightly.

The grooves 22D and the storage grooves 22C provided on three sides may be all connected to form an annular shape. This makes it possible to further prevent the irradiation light from the light source from being diffused from within the groove.

[0033]

According to the present invention, the light guide plate is provided with a storage groove,
By adopting a configuration in which the light source is housed in the housing groove, external influences such as external force and dust can be reduced. Therefore, unlike the conventional case, the housing is added as an independent structure, and it is not necessary to store each component of the present invention in the housing. This prevents the entire device from being enlarged by the housing and makes the entire device thinner. It is possible to reduce the weight by the weight of the housing.

[0034] Furthermore, since the arrangement to eliminate the housing, it is possible to reduce the equipment number of the housing itself it is possible to reduce the man-hours of attaching adjustment for mounting each constituent on the housing, the productivity It is possible to improve.

In the present invention, since the light guide plate is provided with a groove at a position corresponding to the periphery of the liquid crystal display panel, the irradiation light from the light source is diffused inside the light guide plate from within the range of the liquid crystal display panel. Therefore, the amount of light emitted from the light emitting surface of the light guide plate can be increased without impairing the irradiation light from the light source on the other side.

Furthermore, in the present invention, since each surface except for the light incident surface and the light emitting surface of the light guide plate is configured to cover the reflective film, the light emitted from the light source is incident from the light incident surface, the light guide plate Internally, this irradiating light is repeatedly reflected by the reflective film on each surface other than the light emitting surface, preventing light from leaking to the outside, so that the amount of light emitted from the light emitting surface can be improved. It becomes possible.

In the case where the liquid crystal display panel is provided on the light guide plate via a pressing member having a size substantially equal to that of the light guide plate, the light source, the storage groove, and the like are shielded from the outside. Becomes Therefore, it is possible to more effectively eliminate the influence of external force, dust, and the like on these components.

Since the present invention is constructed and functions as described above, it is possible to provide an excellent liquid crystal display device which has not been achieved conventionally.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an example of the present invention.

FIG. 2 is an explanatory view showing the light guide plate disclosed in FIG. 1 and showing a progress state of irradiation light inside the light guide plate.

FIG. 3 is a perspective view showing the light guide plate disclosed in FIG. 1;

FIG. 4 is an explanatory view showing an embodiment of the present invention based on an explanation example, showing a light guide plate covered with a reflective film, and showing a progress state of irradiation light inside the light guide plate.

FIG. 5 is a partially cutaway perspective view showing a conventional liquid crystal display device.

FIG. 6 is an explanatory view showing the conventional light guide plate disclosed in FIG. 5 and showing a progress state of irradiation light inside the light guide plate.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 liquid crystal display panel 2 backlight mechanism 21 light source 22 light guide plate 22A light incident surface 22B light emitting surface 22C storage groove 22D groove 3 holding member 10 liquid crystal display device 30 reflective film

Claims (2)

(57) [Claims] 1. A liquid crystal display device comprising: a transmissive liquid crystal display panel; and a backlight mechanism disposed on a back surface side of a display surface of the liquid crystal display panel. A light source having substantially the same length as the width, a light guide plate having a light incident surface on which irradiation light from the light source is incident and a light emitting surface for emitting light by the incident ,
A reflector for irradiating the light from the light source to the light incident surface;
And on the light emitting surface of the light guide plate, around the liquid crystal display panel.
Along the groove according to the size and shape of the LCD panel
The light source and the reflector are housed in a part of the groove.
Among the surfaces of the light guide plate, the light incident surface or the
Except for the part inside the groove on the light emitting surface, the reflective film
A liquid crystal display device characterized by being coated . Wherein said liquid crystal display panel, a liquid crystal display device according to claim 1 or 2, wherein via the pressing member substantially equal in magnitude to the light guide plate, characterized in that attached to the light guide plate.