Display device with heat dissipation plate

A backlight module and a display panel. The backlight module comprises a light guide plate, a heat dissipation plate and a light source. The display panel comprises a liquid crystal screen and a circuit board connected with the liquid crystal screen, the liquid crystal screen and the circuit board are arranged parallel to an arrangement direction of the heat dissipation plate main body and are respectively arranged at two sides of the heat dissipation plate. By means of the display device, the heat conducted to the back plate in the region of the heat dissipating plate corresponding to the circuit board can be reduced, and the temperature of the region where the circuit board locates can be reduced, thereby preventing aging of the electronic component and prolonging the lifetime of the circuit board.

RELATED APPLICATIONS

The present application is the U.S. national phase entry of PCT/CN2015/088974, with an international filling date of Sep. 6, 2015, which claims the benefit of Chinese Patent Application No. 201520258482.0, filed on Apr. 24, 2015, the entire disclosure of which are incorporated herein by reference.

FIELD OF THE INVENTION

The present invention belongs to the field of display technology, particularly to a display device.

BACKGROUND OF THE INVENTION

Since the liquid crystal itself does not emit light, a back light module (BLM) is generally used in the liquid crystal display (LCD) for providing uniform light source for the liquid crystal screen, so as to realize image display. Based on different arrangement positions of the light source in the back light module, the back light module is classified into side type back light module and direct type back light module, wherein the light source in the side type back light module is located at the side of the display panel, the light source in the direct type back light module is located at the bottom of the display panel.

The existing back light module generally uses a light emitting diode (LED) as the light source, the LED is a low heat luminous body, however, a large amount of LEDs that are lit up for a long time will also generate a lot of heat; meanwhile, for the convenience of power supply connection, a printed circuit board (PCB) for supplying power and signal source driving for the liquid crystal screen in the display panel is connected with the liquid crystal screen and is arranged on the back plate, during operation of the display device, the PCB will also generate certain heat. In order to ensure normal operation of the display device, heat dissipation holes are generally provided on the shell at the back of the display device, and the light source and the PCT are arranged in a heat dissipation chamber formed between the back plate and the shell.

In order to enable the structure of the display device to be thin, in the existing side type back light module, the heat generated by the light source and the heat generated by the PCB are collected simultaneously and conducted through a same heat dissipation plate, and the back plate under the light bar supports the PCB directly. Since the heat dissipation plate does not distinguish the heat emanated by the light bar and the PCB, and generally the heat emanated by the light bar is greater than the heat emanated by the PCB, the heat that is directly conducted to the back plate will cause the PCB located at the back plate to have a relatively large heat dissipation pressure, which accelerates aging of the PCB and the electronic components thereon, and reduces the use lifetime of the display device.

It shows that designing a back light module that can increase the heat dissipating effect and prevent aging of the PCB and the electronic components thereon on the basis of ensuring a compact structure has become a technical problem that needs to be solved urgently at present.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a display device with respect to the above defects existing in the prior art, wherein, by arranging an arch structure on the heat dissipation plate, the heat conducted to the back plate in the region of the heat dissipating plate corresponding to the circuit board can be reduced, the temperature of the region where the circuit board locates can be reduced, thereby preventing aging of the electronic component and prolonging the lifetime of the circuit board.

According to an aspect of the present invention, a display device is provided, comprising a backlight module and a display panel, the backlight module comprises a light guide plate, a heat dissipation plate and a light source, the heat dissipation plate comprises a heat dissipation plate main body and a heat dissipation plate side body, the heat dissipation plate side body is perpendicular to the heat dissipation plate main body and is connected with the heat dissipation plate main body at at least one side of the heat dissipation plate main body; the display panel comprises a liquid crystal screen and a circuit board connected with the liquid crystal screen, the liquid crystal screen and the circuit board are arranged parallel to an arrangement direction of the heat dissipation plate main body and are respectively arranged at two sides of the heat dissipation plate; a distance between at least one portion of a region of the heat dissipation plate main body corresponding to the circuit board and the liquid crystal screen is less than a distance between other regions of the heat dissipation plate main body and the liquid crystal screen.

In some embodiments, in the region of the heat dissipation plate main body corresponding to the circuit board, an arch structure facing towards the liquid crystal screen is formed relative to a plane where the circuit board locates.

In some embodiments, the display device further comprises a back plate, the circuit board is arranged at a side of the back plate away from the heat dissipation plate, and corresponds to the arch structure of the heat dissipation plate.

In some embodiments, the arch structure is a single arch structure; or the arch structure can also be a multi-arch structure comprising at least two connected holes.

In some embodiments, a bottom of a connecting portion of adjacent holes of the multi-arch structure is in contact with the back plate when the arch structure is a multi-arch structure comprising at least two connected holes.

In some embodiments, the light guide plate is arranged between the heat dissipation plate and the liquid crystal screen, an arrangement direction of a top of the arch structure is parallel to an arrangement direction of the light guide plate, the top of the arch structure is provided with contact components distributed at intervals and configured in concave and convex, and the top of the arch structure is in contact with a bottom of the light guide plate through the contact components.

In some embodiments, the backlight module further comprises a bottom reflective sheet, the bottom reflective sheet is arranged in parallel with the light guide plate and is located between the light guide plate and the heat dissipation plate, an arrangement region of the bottom reflective sheet at least corresponds to a center region of the light guide plate.

In some embodiments, the arrangement direction of the top of the arch structure is parallel to the arrangement direction of the bottom reflective sheet, the top of the arch structure is provided with groove structures or protrusion structures distributed at intervals, and the top of the arch structure is in contact with a bottom of the bottom reflective sheet.

In some embodiments, the light source is arranged on the heat dissipation plate side body, and is located at at least one side of the light guide plate.

In some embodiments, the heat dissipation plate main body and the back plate are connected through a screw or are connected by riveting directly.

The beneficial effect of the present invention is: in the display device, by forming an arch structure in a region of the heat dissipation plate of the backlight module corresponding to the circuit board, conducting partly the heat generated by the light source e.g. light bar to the inner space of the back plate close to the display device. On the one hand, a better heat dissipating effect can be achieved; on the other hand, the region of the back plate corresponding to the circuit board is made not to be in contact with the heat dissipation plate, thereby solving the problem that the heat is concentrated when the light entrance side of the side type backlight module is same as the data line lead-out side of the circuit board of the display panel, releasing the heat dissipation pressure of the circuit board region, and increasing the use lifetime of the display device.

DETAILED DESCRIPTION OF THE INVENTION

In order to enable the skilled person in the art to understand the technical solution of the present invention better, next, the display device of the present invention will be described in more details with reference to the drawings and the specific implementing modes. The following reference signs will be used throughout the specification and accompanying figures:

A first embodiment provides a display device which solves the problem of concentrated heat dissipation when the data line lead-out side of the circuit board of the display panel and the light source of the side type back light module are at the same side, and increases the use lifetime of the display device.

As shown inFIG. 1, the display device comprises a backlight module and a display panel, wherein the backlight module comprises a light guide plate13, a heat dissipation plate11and a light source (e.g., a light bar12inFIG. 1), the heat dissipation plate11comprises a heat dissipation plate main body111and a heat dissipation plate side body112, the heat dissipation plate side body112is perpendicular to the heat dissipation plate main body111and is connected with the heat dissipation plate main body111at at least one side of the heat dissipation plate main body111; the display panel comprises a liquid crystal screen21and a circuit board22(the circuit board22for example may be PCB or FPC) connected with the liquid crystal screen21, the liquid crystal screen21and the circuit board22are arranged parallel to an arrangement direction of the heat dissipation plate main body111and are respectively arranged at two sides of the heat dissipation plate11; wherein a distance between at least one portion of a region of the heat dissipation plate main body111corresponding to the circuit board22and the liquid crystal screen21is less than a distance between other regions of the heat dissipation plate main body111and the liquid crystal screen21.

For example, the heat dissipation plate11in this embodiment can be an L-shaped structure (forming the heat dissipation plate side body112at one side of the heat dissipation plate main body111) which forms an opening at a side facing towards the liquid crystal screen21or a concave structure (forming the heat dissipation plate side body112at both of the two opposite sides of the heat dissipation plate main body111). Moreover, the L-shaped structure or the concave structure is further provided with an arch facing towards the liquid crystal screen21at a side opposite to the opening.

InFIG. 1, in the region of the heat dissipation plate main body111corresponding to the circuit board22, an arch structure113facing towards the liquid crystal screen21is formed relative to a plane where the circuit board22locates. In this embodiment, the arch structure113is a single arch structure.

The light guide plate13is arranged between the heat dissipation plate11and the liquid crystal screen21, a light source is arranged on the heat dissipation plate side body112and is located at at least one side of the light guide plate13. For example, a heat dissipation plate11in a concave structure with two heat dissipation plate side bodies112can be used to arrange two light sources respectively on the heat dissipation plate side bodies112at two sides of the concave structure; or, two heat dissipation plates11of L-shaped structure can be used, each heat dissipation plate11of L-shaped structure only has one heat dissipation plate side body112, one light source is arranged on the heat dissipation plate side body112of each heat dissipation plate11.

Further, in this embodiment, an arrangement direction of a top of the arch structure113is parallel to an arrangement direction of the light guide plate13, the top of the arch structure113is provided with contact components distributed at intervals and configured in concave and convex, and the top of the arch structure113is in contact with a bottom of the light guide plate13through the contact components.

The contact components include protrusion structures and groove structures.FIG. 2is a local amplification view ofFIG. 1. FromFIG. 2, it can be seen clearly that the top region is provided with protrusion structures115and groove structures116distributed at intervals. The protrusion structures15and the groove structures116, for example, can be parallel to the side surface of the light bar respectively. As shown inFIG. 3, the protrusion structures15and the groove structures116can also be arranged at intervals and perpendicular to the side surface of the light bar respectively.

It should be apparent that the contact components in the top region can also be as shown inFIG. 4, only protrusion structures115are arranged on the upper surface thereof. Here, by arranging the arch structure113facing towards the liquid crystal screen21in the region of the heat dissipation plate11corresponding to the circuit board22, and arranging contact components in the region of the top of the arch structure113in contact with the bottom of the light guide plate13so as to reduce the contact area of the heat dissipation plate11and the light guide plate13, the influence of conducting heat by the heat dissipation plate11to the light guide plate13is reduced.

In addition, it can be seen fromFIG. 1that the backlight module in this embodiment can further comprise an optical film material15, the optical film material15can make the backlight module to obtain more uniform backlight with appropriate brightness.

InFIG. 1, the display device further comprises a back plate31. Optionally, the heat dissipation plate main body111and the back plate31are connected through a screw or are connected by riveting directly, whereas the circuit board22is arranged at a side of the back plate31away from the heat dissipation plate11, and the region of the back plate31in which the circuit board22is arranged is separated from the heat dissipation plate11. The heat generated by the light bar12is conducted to the back plate31through the heat dissipation plate11. On the one hand, since the actual effective heat dissipation volume of the heat dissipation plate11is increased, a better heat dissipating effect can be achieved. On the other hand, in general cases, since the thermal conductivity of air is far less than the thermal conductivity of metal, it can be effectively ensured that the region where the circuit board22locates is not influenced by large amount of heat, thereby preventing aging of the electronic component and ensuring lifetime of the circuit board.

Certainly, in order to fix the liquid crystal screen21and keep an appropriate distance between the liquid crystal screen21and the backlight module, the display device further comprises a module frame32.

It is easy to understand that in the display device of this embodiment, the backlight module can be a unilateral light entrance or a bilateral light entrance based on the brightness requirement of the liquid crystal screen21. For example, an LED light bar12can be assembled on one heat dissipation plate side body of one heat dissipation plate11, or LED light bars12can be assembled on two opposite heat dissipation plate side bodies of one heat dissipation plate11, or the LED light bars12can be assembled on side bodies of two heat dissipation plates11respectively, which will not be defined here.

In the display device of this embodiment, by arranging an arch structure on the heat dissipation plate, not only can better heat dissipating effect be achieved, but also the heat conducted to the back plate in a region of the heat dissipation plate corresponding to the circuit board can be reduced, and the temperature of the region where the circuit board locates can be reduced, thereby preventing aging of the electronic component and prolonging the lifetime of the circuit board.

In a second embodiment, a display device is provided. The difference between this embodiment and the first embodiment lies in that the arch structure in the heat dissipation plate main body is different.

In this embodiment, in the region of the heat dissipation plate main body111corresponding to the circuit board22, a multi-arch structure113comprising at least two connected holes facing towards the liquid crystal screen21is formed relative to a plane where the circuit board22locates. In this embodiment, the arch structure113is a single arch structure. For example, as shown inFIG. 5, the arch structure113of the heat dissipation plate11in this embodiment can be a double-arch structure. Certainly, the arch structure113can also be a multi-arch structure, this can be designed flexibly based on the size of the circuit board region or the heat dissipation requirement, which will not be defined here.

Further, when the arch structure113is a multi-arch structure comprising at least two connected holes, a bottom of a connecting portion of adjacent holes of the arch structure113is in contact with the back plate31so as to achieve a better supporting effect.

In the display device of this embodiment, other structures in the display panel and the backlight module are same as the corresponding structure of the display device in Embodiment 1, which will not be elaborated here. Similarly, in order to reduce the influence of the heat dissipation plate11to the light guide plate13, the top of the arch structure113can be provided with contact components distributed at intervals and configured in concave and convex, and the top of the arch structure113is in contact with the bottom of the light guide plate13through the contact components, which also will not be further elaborated.

In the display device of this embodiment, by arranging an arch structure on the heat dissipation plate, not only a better heat dissipating effect can be achieved, but also the heat conducted to the back plate in a region of the heat dissipation plate corresponding to the circuit board can be reduced, the temperature of the region where the circuit board locates can be reduced, thereby preventing aging of the electronic component and prolonging the lifetime of the circuit board.

In a third embodiment, a display device is provided. The difference between this embodiment and the first two embodiments lies in that the backlight module in this embodiment further comprises a bottom reflective sheet. By arranging the bottom reflective sheet, the light source can be utilized better so as to improve utilization rate of light.

As shown inFIG. 6, the backlight module further comprises a bottom reflective sheet14. The bottom reflective sheet14is arranged in parallel with the light guide plate13and is located between the light guide plate13and the heat dissipation plate11. An arrangement region of the bottom reflective sheet14at least corresponds to a center region of the light guide plate13. That is, the bottom reflective sheet14is mounted between the light guide plate13and the heat dissipation plate11, the area thereof can be equal to or slightly smaller than the area of the light guild plate13(as shown inFIG. 6).

In this embodiment, the arrangement direction of the top of the arch structure113is parallel to the arrangement direction of the bottom reflective sheet14, the top of the arch structure113is provided with groove structures or protrusion structures distributed at intervals, and the top of the arch structure113is in contact with a bottom of the bottom reflective sheet14.

FIG. 6takes the heat dissipation plate of a single arch structure in Embodiment 1 as an example,FIG. 7is a local amplification view ofFIG. 6. The region of the heat dissipation plate11corresponding to the circuit board22arches towards the liquid crystal screen21; meanwhile, the contact region of the top of the arch structure and the bottom of the bottom reflective sheet14is further provided with protrusion structures115, so as to reduce the contact area of the heat dissipation plate11and the bottom reflective sheet14, and reduce conduction of heat on the heat dissipation plate11to the bottom reflective sheet14, thereby reducing the heat conducted by the dissipation plate11to the light guide plate13and reduce the risk of deformation of the light guide plate13at the light entrance side (i.e., the side close to the light bar) due to being heated.

In the display device of this embodiment, other structures in the display panel and the backlight module are same as the corresponding structure of the display device in Embodiment 1 or Embodiment 2, which will not be elaborated here.

Just as in the first and second embodiments, in the display device of this embodiment, by arranging an arch structure on the heat dissipation plate, not only a better heat dissipating effect can be achieved, but also the heat conducted to the back plate in a region of the heat dissipation plate corresponding to the circuit board can be reduced, the temperature of the region where the circuit board locates can be reduced, thereby preventing aging of the electronic component and prolonging the lifetime of the circuit board.

In the display device of the three embodiments, by forming an arch structure in a region of the heat dissipation plate of the backlight module corresponding to the circuit board, conducting partly the heat generated by the light source e.g. light bar to the inner space of the back plate close to the display device. On the one hand, a better heat dissipating effect can be achieved; on the other hand, the region of the back plate corresponding to the circuit board is made not to be in contact with the heat dissipation plate, thereby solving the problem that the heat is concentrated when the light entrance side of the side type backlight module is same as the data line lead-out side of the circuit board of the display panel, releasing the heat dissipation pressure of the circuit board region, and increasing the use lifetime of the display device.

It can be understood that the above implementing modes are only exemplary implementing modes used for explaining the principle of the present invention, however, the present invention is not limited to this. For the ordinary skilled person in the art, in the case of not departing from spirit and essence of the present invention, various modifications and improvements can be made, these modifications and improvements should also be regarded as the protection scopes of the present invention.