JP2015041050A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device that can prevent a liquid crystal display panel and a protective plate from dropping without adding a new component and without causing display unevenness.SOLUTION: A liquid crystal display device includes a liquid crystal display panel 2, a protective plate 1 arranged on the front face of the liquid crystal display panel 2, and a back light unit arranged on the rear face of the liquid crystal display panel 2 and including a back light frame 6 holding a light source, where the back light frame 6 is provided with a holding part 10 extending to the side edge parts of the protective plate 1, and the holding part 10 is engaged with the side edges of the protective plate 1.

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device in which a protective plate is disposed on the front surface of a liquid crystal display panel and a backlight unit having a backlight frame is disposed on the back surface of the liquid crystal display panel.

  A thin liquid crystal display device is used as a display device of portable information devices (actual devices) such as a mobile phone, a personal digital assistant (PDA), a digital camera, and a multimedia player.

1 to 3 are sectional views showing examples of conventional liquid crystal display devices.
The main components of the liquid crystal display device are a liquid crystal display panel 2 in which a liquid crystal layer is sealed in a pair of transparent substrates such as glass, and a protective plate made of a transparent hard material such as glass disposed in front of the liquid crystal display panel 2. 1 and a backlight unit disposed on the back surface of the liquid crystal display panel 2.

The protective plate 1 and the liquid crystal display panel 2 are integrated by being bonded together with a transparent adhesive or the like, and the protective plate 1 protects the liquid crystal panel 2 against external loads.
The backlight unit includes a backlight frame 6 that holds a light source such as an LED, a light guide plate that guides light from the light source, and a backlight unit 3 that irradiates the liquid crystal display panel 2 with the guided light as planar light. Yes. The backlight frame 6 and the backlight unit 3 are modules incorporated in a lower frame 7 that is a rigid member.

The backlight frame 6 and the backlight unit 3 are modules incorporated in a lower frame 7 which is a rigid member, and the liquid crystal display panel 2 is attached to the backlight frame at the edge by an adhesive layer 5 such as a light-shielding double-sided tape. 6 is fixed to the liquid crystal display device.
There are various structures for mounting such a liquid crystal display device on an actual machine, and there are examples shown in FIGS. 1 and 2 depending on the size of the protective plate 1 for the liquid crystal display panel 2, respectively.

The conventional example shown in FIG. 1 is a mounting structure of a liquid crystal display device in which the protective plate 1 is smaller than the liquid crystal display panel 2 and the outer edge portion of the liquid crystal display panel 2 projects laterally.
In this mounting structure, the liquid crystal display device is housed in a mounting portion provided in the housing 4 of the actual machine, the lower frame 7 is fixed to the holder 8, and the edge of the liquid crystal display panel 2 is held by the housing 4, so that the liquid crystal The display device is fixed to the actual machine.
In this mounting structure, even if an external force (upward force in the figure) that causes the relatively heavy liquid crystal display panel 2 to jump out of the casing due to the fall of the actual device or the like acts, By suppressing the edge portion with the housing 4, the liquid crystal display panel 2 can be prevented from jumping out of the housing 4.
However, in this mounting structure, there is a concern that a large load is applied to the liquid crystal display panel 2 when an external force (downward force in the figure) in the direction of pushing into the protective plate 1 is applied.

The conventional example shown in FIG. 2 is a mounting structure of a liquid crystal display device in which the protective plate 1 is larger than the liquid crystal display panel 2 and the outer edge portion of the protective plate 1 projects sideways.
In the mounting structure shown in FIG. 2A, the liquid crystal display device is placed in the mounting portion provided on the housing 4 of the actual machine, and the lower frame 7 is fixed to the holder 8, thereby fixing the liquid crystal display device to the actual machine. Yes.
In this mounting structure, the edge of the protective plate 1 can be supported from below by the backlight frame 6, and even if an external force in the direction of pushing into the protective plate 1 (downward force in the figure) is applied, the liquid crystal display A situation in which a large load is applied to the panel 2 can be prevented.

  However, in this mounting structure, the relatively heavy liquid crystal display panel 2 and the protective plate 1 are bonded and fixed by the adhesive layer 5, but are not mechanically fixed as in the example of FIG. As a result, as shown in FIG. 2B, the liquid crystal display panel 2 and the protective plate 1 jump out of the housing 4 due to the external force described above.

As a countermeasure, there is a mounting structure illustrated in FIG.
In this mounting structure, the upper frame 9 that engages with the edge of the liquid crystal display panel 2 is added, and the upper frame 9 is fitted and fixed to the lower frame 7 so that the liquid crystal display panel 2 and the protective plate 1 are fixed. Jumping out of the housing 4 is prevented.
However, such a mounting structure increases the number of parts, leading to an increase in cost, and requires a difficult assembly operation of inserting the upper frame 9 into a narrow gap between the liquid crystal display panel 2 and the protective plate 1. There are disadvantages. Furthermore, since the liquid crystal display panel 2 is directly held by the upper frame 9 and resists the above external force, the liquid crystal display panel 2 is stressed, resulting in display unevenness. It is feared that it will cause.

Patent Document 1 discloses a configuration in which a liquid crystal display panel is prevented from falling off by sandwiching a liquid crystal display panel and a lower frame using a plate-like member.
However, the configuration described in Patent Document 1 also has the same problem as the example shown in FIG.

JP 2007-298622 A

The problem to be solved by the present invention is to provide a liquid crystal display device that can prevent the display panel and the protective plate from falling off without causing the above problems.
That is, an object of the present invention is to provide a liquid crystal display device that can prevent the liquid crystal display panel and the protective plate from falling off without adding new parts and without causing display unevenness.

In order to solve the above problems, the liquid crystal display device of the present invention has the following technical features.
(1) It has a liquid crystal display panel, a protective plate disposed on the front surface of the liquid crystal display panel, and a backlight unit disposed on the back surface of the liquid crystal display panel, and the backlight unit holds a light source. In the liquid crystal display device having the backlight frame to be provided, the backlight frame is provided with a holding portion extending to the side edge portion of the protection plate, and the holding portion and the side edge of the protection plate are engaged. It is characterized by.

(2) In the display device according to (1), the protection plate has a rectangular shape, and the protection plate is engaged with the holding portion at the opposite side edge.

(3) In the liquid crystal display device according to (1) or (2), when the protrusion provided on the side edge of the protective plate is engaged with the protrusion provided on the holding portion, the holding portion and the protective plate It is characterized by engaging with the side edge of the.

(4) In the liquid crystal display device according to (3), the backlight frame is formed of a resin mold together with the holding portion, and when the holding portion is elastically deformed, the protrusion provided on the holding portion and the It is characterized by engaging with a protrusion provided on the side edge of the protective plate.

  According to the present invention, it is possible to provide a liquid crystal display device that can prevent the liquid crystal display panel and the protective plate from falling off without adding new parts and without causing display unevenness.

It is a schematic sectional drawing which shows an example of the conventional liquid crystal display device. It is a schematic sectional drawing which shows another example of the conventional liquid crystal display device. It is a schematic sectional drawing which shows another example of the conventional liquid crystal display device. It is a schematic sectional drawing which shows the liquid crystal display device based on one Example of this invention. It is a schematic sectional drawing which shows the liquid crystal display device based on another Example of this invention. It is a schematic sectional drawing which shows the liquid crystal display device which concerns on another one Example of this invention. It is a schematic sectional drawing which shows the liquid crystal display device which concerns on another one Example of this invention.

Hereinafter, the present invention will be described in detail using preferred embodiments.
A liquid crystal display device according to an embodiment of the present invention shown in FIG. 4 is disposed on a liquid crystal display panel 2, a protective plate 1 disposed on the front surface of the liquid crystal display panel 2, and a back surface of the liquid crystal display panel 2. In the liquid crystal display device having the backlight frame 6 that holds the light source, the backlight unit extends to the side edge of the protective plate 1 in the backlight frame 6. A holding unit 10 is provided, and the holding unit 10 is engaged with a side edge of the protection plate 1.

The liquid crystal display devices of the embodiments shown in FIGS. 4 to 7 are the same as those of the conventional liquid crystal display device shown in FIG. A duplicate description of parts and functions is omitted.
Also, in the liquid crystal display devices of the respective embodiments, the same reference numerals are given to the same parts, and duplicate descriptions of the parts and functions already described are omitted.
As described in detail below, the liquid crystal display device of each embodiment has a main characteristic point in the configuration in which the side edge of the protective plate 1 is engaged with the backlight frame 6.

The liquid crystal display device shown in FIG. 4 is provided with a holding portion 10 that extends to the side edge of the protective plate 1 on the backlight frame 6, and further, a protrusion 11 directed toward the side edge is provided at the tip of the holding portion 10. is there. On the other hand, a flange 12 is provided on the side edge of the protective plate 1 facing the holding portion 10, and the flange 12 is a protrusion that engages with the protrusion 11.
Therefore, in a state where the liquid crystal display panel 2 fixed integrally with the protective plate 1 is attached to the backlight frame 6 with the adhesive layer 5, the protrusion 11 is engaged with the flange 12 from the surface side (upper side in the drawing) of the protective plate 1. In addition, the protection plate 1 is held with a drag force in a direction of protruding from the housing 4 by the engagement between the holding portion 10 and the side edge of the protection plate 1.

As an example, the length of the flange 12 protruding from the protective plate 1 is about 1 to 2 mm, and the thickness of the flange 12 is 0. When the thickness of the protective plate 1 is about 1.5 mm to 2 mm. It is about 5 mm to 1 mm.
The protective plate 1 is formed of glass, hard transparent resin, or the like, and the flange 12 is integrally formed when the protective plate 1 is formed, or the side edge of the formed protective plate 1 is cut, or What is necessary is just to provide by a well-known various method, such as adhere | attaching parts to the side edge of the formed protective plate 1. FIG.

The backlight frame 6 can be formed of various materials. However, the holding portion 10 and the protrusion 11 are integrally formed when the backlight frame 6 is formed, or the formed backlight frame 6 is cut. Alternatively, it may be provided by various known methods such as bonding parts to the formed backlight frame 6.
The backlight frame 6 is preferably molded by a resin material having elasticity. When such a resin mold is used, the light source can be easily attached by being molded integrally, and at the time of assembly work. The protrusion 11 and the flange 12 can be easily engaged by the elastic deformation of the holding portion 10 and the protrusion 11.

The liquid crystal display device of the present embodiment is mounted on an actual device as a module in a state where the holding unit 10 and the protective plate 1 are engaged as described above. In other words, the liquid crystal display device is fixed to the actual machine by placing the liquid crystal display device in the mounting portion provided in the actual machine housing 4 and fixing the lower frame 7 to the holder 8.
In this mounting structure, the edge of the protective plate 1 can be supported from below by the backlight frame 6, so that a great load is applied to the liquid crystal display panel 2 even if an external force is applied to the protective plate 1. Can be prevented.

Moreover, even if the planar size of the protective plate 1 is larger than the planar size of the liquid crystal display panel 2 as shown in FIG. 2, the holding unit 10 and the protective plate 1 are engaged, so that the actual machine falls. Even if an external force is applied due to the above, a situation in which the protective plate 1 and the liquid crystal display panel 2 jump out of the housing 4 is prevented.
Furthermore, unlike the countermeasure example shown in FIG. 3, the upper frame, which is a separate part, is not newly used, so that there is no inconvenience caused by using the separate part.

  The liquid crystal display device shown in FIG. 5 is an embodiment in which the liquid crystal display device shown in FIG. 4 is modified. The size of the opening of the mounting portion of the housing 4 is slightly larger than that of the protective plate 1, From the gap, the tip of the holding unit 10 and the protrusion 11 may constitute the appearance of the actual machine.

The liquid crystal display device shown in FIG. 6 has a bowl-like shape in which the protrusion 11 provided at the tip of the holding portion 10 has a slope whose upper surface is inclined downward. Further, a groove is formed in the side edge portion of the protective plate 1 facing the holding portion 10, and the protrusion 11 is engaged with the side wall of the groove. That is, the side wall of the groove is a protrusion 12 that engages with the protrusion 11.
Here, as described above, the backlight frame 6 is preferably a resin mold. In particular, in the aspect in which the protrusion 11 is provided with the inclined surface, the protective plate 1 is attached to the backlight frame 6 in the assembly operation of the liquid crystal display device. By pushing in, the holding portion 10 of the backlight frame 6 can be elastically deformed, and the protrusion 11 and the protrusion 12 can be easily engaged.

The liquid crystal display device according to the present embodiment is mounted on an actual device as a module in a state in which the holding portion 10 and the protective plate 1 are engaged with each other when the protrusions 11 and 12 are engaged. .
Even in the mounting structure of the present embodiment, the edge of the protective plate 1 can be supported from below by the backlight frame 6, so that a large load is applied to the liquid crystal display panel 2 even if an external force acts on the protective plate 1. The situation where it takes can be prevented.

  In addition, as shown in FIG. 2, even if the planar size of the protective plate 1 is larger than the planar size of the liquid crystal display panel 2, even if an external force is applied due to the fall of the actual machine, The situation where the protective plate 1 and the liquid crystal display panel 2 jump out of the housing 4 is prevented, and the upper frame which is a separate part is not newly used as in the countermeasure example shown in FIG. There is no inconvenience caused by using the separate parts.

  The liquid crystal display device shown in FIG. 7 is an embodiment in which the liquid crystal display device shown in FIG. 6 is modified. The size of the opening of the mounting portion of the housing 4 is slightly larger than that of the protective plate 1, From the gap, the tip of the holding unit 10 may constitute the appearance of the actual machine.

Here, in each of the above-described embodiments, the number and position of the protrusions 11 and the protrusions 12 that are engaged with each other can be arbitrarily set. For example, the protrusions 11 and the protrusions 12 are respectively provided at the four corners of the rectangular protection plate 1. Various aspects can be adopted in the present invention, such as being provided over the entire circumference of one side edge or provided on opposite side edges of the rectangular protective plate 1.
In short, in the present invention, the protection plate 1 and the backlight frame 6 are engaged such that the projection 11 and the projection 12 are engaged, and the protection plate 1 and the liquid crystal display panel 2 jump out of the housing 4. It is only necessary to prevent such a situation.

  In addition, it is preferable that the protrusion 11 and the protrusion 12 that are engaged with each other are preferably provided on opposite side edges of the rectangular protective plate 1. According to this aspect, in the assembly work of the liquid crystal display device, The protective plate 1 can be assembled to the backlight frame 6 by sliding the protective plate 1 from one side end thereof while the projection 12 is engaged, and the assembly work can be easily performed. .

In each of the above-described embodiments, as a typical example of engaging the holding portion 10 provided with the backlight frame 6 and the side edge of the protective plate 1, the aspect in which the protrusions are engaged is shown. In the present invention, it is possible to adopt various known modes such as, for example, subjecting the holding portion 10 and the side edges of the protective plate 1 to rough surface processing, and engaging and engaging these rough surfaces. it can.
Further, as shown in the above embodiments, the present invention is suitable for application to a liquid crystal display device in which the planar size of the protective plate 1 is larger than the planar size of the liquid crystal display panel 2. The present invention is not limited to this, and can be applied to various types of liquid crystal display devices such as a liquid crystal display device in which the planar size of the protective plate 1 is smaller than the planar size of the liquid crystal display panel 2.

  The present invention is used in a liquid crystal display device such as a mobile phone, a personal digital assistant (PDA), a digital camera, and a multimedia player. In particular, the liquid crystal of a type in which the planar size of the protective plate 1 is larger than the planar size of the liquid crystal display panel 2. It is suitable for application to a display device.

DESCRIPTION OF SYMBOLS 1 Protective plate 2 Liquid crystal display panel 3 Backlight part 4 Case 5 Adhesive layer 6 Backlight frame 7 Lower frame 8 Holder 9 Upper frame 10 Holding part 11 Protrusion 12 on the protective part 12 Protrusion part on the protective plate side

Claims (4)

A liquid crystal display panel;
A protective plate disposed in front of the liquid crystal display panel;
A backlight unit disposed on the back surface of the liquid crystal display panel,
In the liquid crystal display device having a backlight frame for holding the light source, the backlight unit,
A liquid crystal display device, wherein a holding portion extending to a side edge portion of the protection plate is provided on the backlight frame, and the holding portion is engaged with a side edge of the protection plate. The liquid crystal display device according to claim 1.
2. The liquid crystal display device according to claim 1, wherein the protective plate has a rectangular shape, and the protective plate is engaged with the holding portion at the opposing side edge. The liquid crystal display device according to claim 1 or 2,
A liquid crystal display device, wherein a protrusion provided on a side edge of the protective plate is engaged with a protrusion provided on the holding portion, whereby the holding portion and a side edge of the protective plate are engaged. The liquid crystal display device according to claim 3.
The backlight frame is formed of a resin mold together with the holding portion,
A liquid crystal display device, wherein the holding portion is elastically deformed to engage with a protrusion provided on the holding portion and a protrusion provided on a side edge of the protective plate.

Images