CN108769556B - Large-size liquid crystal display television and heat dissipation structure thereof - Google Patents
Large-size liquid crystal display television and heat dissipation structure thereof Download PDFInfo
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- CN108769556B CN108769556B CN201810410001.1A CN201810410001A CN108769556B CN 108769556 B CN108769556 B CN 108769556B CN 201810410001 A CN201810410001 A CN 201810410001A CN 108769556 B CN108769556 B CN 108769556B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20954—Modifications to facilitate cooling, ventilating, or heating for display panels
- H05K7/20972—Forced ventilation, e.g. on heat dissipaters coupled to components
Abstract
The invention provides a large-size liquid crystal display television and a heat dissipation structure thereof, wherein the heat dissipation structure comprises: the cavity is formed between the back panel and the display panel and comprises a first sub-cavity corresponding to a first heating area on the display panel and a second sub-cavity corresponding to a second heating area on the display panel according to the heating temperature distribution of the display panel, and the average temperature of the first heating area is higher than that of the second heating area; a plurality of heat dissipation devices installed in the cavity, for dissipating heat from the display panel, wherein the distribution of the plurality of heat dissipation devices in the cavity satisfies: the heat dissipation capacity in the first sub-cavity is larger than that in the second sub-cavity. The invention ensures that the temperature rise caused by long-time use of a large-size liquid crystal television is in a reliable range by reasonably arranging the heat dissipation device in a targeted manner, and reduces the heat dissipation cost while reducing the temperature of the display panel.
Description
Technical Field
The invention relates to the technical field of screen display, in particular to a large-size liquid crystal television and a heat dissipation structure thereof.
Background
With the rapid growth of the panel industry, the development and research of large-sized liquid crystal panels have been increased, wherein the large-sized liquid crystal panels, due to the increased number of LEDs used, pose new challenges to the heat dissipation method under the requirements of ultra-thinness and cost reduction. The traditional heat dissipation methods such as aluminum extrusion and heat dissipation fins cannot meet the requirements of high power consumption large-size liquid crystal panels such as HDR and the like, so forced air cooling heat dissipation is gradually applied to models with large-size and high-power LED requirements.
For 85 cun curved surface direct type liquid crystal display television, the power of the LED is high in the backlight design, so that the actual temperature measurement of the 85 cun curved surface backlight module is close to the upper limit of the design specification, the quality of a display picture is guaranteed, the service life of the LED is prolonged, the cost is reduced, the output is reduced, a reasonable and simple heat dissipation mode is found, and the heat dissipation cost benefit maximization is a problem to be solved urgently.
In a traditional heat dissipation mode, fans are uniformly arranged on a back plate, and air convection is formed by air draft of the fans to dissipate heat. However, this method does not consider the non-uniformity of the heat distribution of the panel, resulting in insufficient heat dissipation in the area with higher heat generation temperature, and thus the temperature of the backlight module cannot be effectively reduced.
Disclosure of Invention
The invention provides a large-size liquid crystal television and a heat dissipation structure thereof, so as to effectively reduce the temperature of a display panel and improve the reliability of a product.
In order to solve the above technical problem, the present invention provides a heat dissipation structure of a large-sized liquid crystal television, including:
the cavity is formed between the back panel and the display panel and comprises a first sub-cavity corresponding to a first heating area on the display panel and a second sub-cavity corresponding to a second heating area on the display panel according to the heating temperature distribution of the display panel, and the average temperature of the first heating area is higher than that of the second heating area;
a plurality of heat dissipation devices installed in the cavity, for dissipating heat from the display panel, wherein the distribution of the plurality of heat dissipation devices in the cavity satisfies: the heat dissipation capacity in the first sub-cavity is larger than that in the second sub-cavity.
Wherein, be equipped with two vertical strengthening ribs that are parallel to each other and interval distribution on the backplate, two vertical strengthening ribs will the cavity divide into middle sub-cavity, is located the left side sub-cavity of middle sub-cavity and being located the right side sub-cavity on middle sub-cavity right side, first sub-cavity does middle sub-cavity, the second sub-cavity includes left side sub-cavity with right side sub-cavity.
And one part of the plurality of heat dissipation devices is positioned in the upper area of the middle sub-cavity, and the other part of the plurality of heat dissipation devices is respectively positioned in the area of the left side sub-cavity close to the middle sub-cavity and the area of the right side sub-cavity close to the middle sub-cavity.
The back plate is provided with a left sub-cavity, the left sub-cavity is divided into an upper left sub-cavity and a lower left sub-cavity, the middle sub-cavity is divided into an upper middle sub-cavity and a lower middle sub-cavity, the right sub-cavity is divided into an upper right sub-cavity and a lower right sub-cavity, the first sub-cavity comprises the upper middle sub-cavity and the lower middle sub-cavity, and the second sub-cavity comprises the upper left sub-cavity, the lower left sub-cavity, the upper right sub-cavity and the lower right sub-cavity.
And one part of the plurality of heat dissipation devices is positioned in the upper area of the middle upper sub-cavity and the upper area of the middle lower sub-cavity, and the other part of the plurality of heat dissipation devices is respectively positioned in the area of the left upper sub-cavity and the left lower sub-cavity close to the middle sub-cavity and the area of the right upper sub-cavity and the right lower sub-cavity close to the middle sub-cavity.
The heat dissipation device is a fan, the fan is used for dissipating heat of the display panel through air draft, and the air draft of the first sub-cavity is larger than that of the second sub-cavity.
The first longitudinal reinforcing rib is provided with a through hole for communicating the middle sub-cavity with the left sub-cavity, and the second longitudinal reinforcing rib is provided with a through hole for communicating the middle sub-cavity with the right sub-cavity.
Wherein the air volume of the single fan positioned in the left side sub-cavity and the right side sub-cavity is smaller than the air volume of the single fan positioned in the middle sub-cavity.
The present invention also provides a large-sized liquid crystal television, including:
a back panel and a display panel;
the cavity is formed between the back plate and the display panel and comprises a first sub-cavity corresponding to a first heating area on the display panel and a second sub-cavity corresponding to a second heating area on the display panel according to the heating temperature distribution of the display panel, and the average temperature of the first heating area is higher than that of the second heating area;
a plurality of heat dissipation devices installed in the cavity, for dissipating heat from the display panel, wherein the distribution of the plurality of heat dissipation devices in the cavity satisfies: the heat dissipation capacity in the first sub-cavity is larger than that in the second sub-cavity.
The back plate is provided with two longitudinal reinforcing ribs and one transverse reinforcing rib which are parallel to each other and distributed at intervals, the cavity is divided into six sub-cavities distributed in two rows and three columns by the two longitudinal reinforcing ribs and the transverse reinforcing ribs, the first sub-cavity comprises a middle upper sub-cavity and a middle lower sub-cavity, and the second sub-cavity comprises a left upper sub-cavity, a left lower sub-cavity, a right upper sub-cavity and a right lower sub-cavity;
and one part of the plurality of heat dissipation devices is arranged in the upper areas of the middle upper sub-cavity and the middle lower sub-cavity, and the other part of the plurality of heat dissipation devices is respectively arranged in the areas of the left upper sub-cavity and the left lower sub-cavity close to the middle sub-cavity and the areas of the right upper sub-cavity and the right lower sub-cavity close to the middle sub-cavity.
The embodiment of the invention has the beneficial effects that: by reasonably arranging the heat dissipation device in a targeted manner, the temperature rise caused by long-time use of a large-size liquid crystal television is ensured to be within a reliable range, and the heat dissipation cost is reduced while the temperature of the display panel is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a cloud diagram of the display panel heating temperature distribution obtained by analog simulation in the embodiment of the present invention.
Fig. 2 is a schematic front view of a heat dissipation structure of a large-sized lcd tv according to an embodiment of the present invention.
Fig. 3 is another schematic front view of a heat dissipation structure of a large-sized lcd tv according to an embodiment of the present invention.
Fig. 4 is another schematic front view of a heat dissipation structure of a large-sized lcd tv according to an embodiment of the present invention.
Fig. 5 is a schematic flow chart illustrating a heat dissipation method of a large-sized lcd tv according to another embodiment of the present invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced.
Aiming at the large-size liquid crystal display television, the invention firstly obtains the heating temperature distribution of the whole display panel through analog simulation, and then purposefully arranges the heat dissipation device at the position with higher temperature, thereby ensuring that the temperature rise caused by long-time use of the large-size liquid crystal display television is in a reliable range. Therefore, an embodiment of the present invention provides a heat dissipation structure for a large-sized lcd tv, including:
the cavity is formed between the back panel and the display panel and comprises a first sub-cavity corresponding to a first heating area on the display panel and a second sub-cavity corresponding to a second heating area on the display panel according to the heating temperature distribution of the display panel, and the average temperature of the first heating area is higher than that of the second heating area;
a plurality of heat dissipation devices installed in the cavity, for dissipating heat from the display panel, wherein the distribution of the plurality of heat dissipation devices in the cavity satisfies: the heat dissipation capacity in the first sub-cavity is larger than that in the second sub-cavity.
Specifically, in this embodiment, the heat dissipation device may be any device capable of dissipating heat of the display panel by forming an air cooling mode through air draft, such as a common fan; the heat sink may also be a heat pipe with water or other cooling medium filled inside. For the convenience of description, the heat dissipation structure of the present embodiment is described below by taking a fan as an example. Referring to fig. 1, a cloud graph of a display panel heating temperature distribution obtained by simulation in an embodiment of the present invention is shown, generally, the display panel has a large amount of heat generation and a high temperature due to a large number of modules and circuit boards in the middle thereof, which is higher than temperatures on both sides, that is, the display panel has relatively high heating temperatures in the a1 area and the a2 area in the middle thereof shown in fig. 1, and relatively low heating temperatures in the B1 area, the B2 area, the C1 area, and the C2 area on both sides thereof shown in fig. 1, so that the a1 area and the a2 area in the middle thereof can be used as first heating areas, and the B1 area, the B2 area, the C1 area, and the C2 area on both sides thereof.
Correspondingly, as shown in fig. 2, two longitudinal reinforcing ribs (a first reinforcing rib 31 and a second reinforcing rib 32) are disposed on the back plate 1 in parallel and spaced apart from each other, and divide the cavity into a middle sub-cavity 10, a left sub-cavity 11 located on the left side of the middle sub-cavity 10, and a right sub-cavity 12 located on the right side of the middle sub-cavity 10. The middle sub-cavity 10 corresponds to a first heat generation region (region a1 and region a 2) as a first sub-cavity; the left sub-cavity 11 corresponds to the second heat generation region (B1 region and B2 region), and the right sub-cavity 12 also corresponds to the second heat generation region (C1 region and C2 region), i.e., the left sub-cavity 11 and the right sub-cavity 12 serve as the second sub-cavity.
In this embodiment, a plurality of fans 2 are arranged in a plurality of ways, one of which is to arrange in the middle sub-cavity 10, and the fans 2 are not arranged in the left sub-cavity 11 and the right sub-cavity 12, so that heat can be directly dissipated to a first heating area with high heating temperature, and meanwhile, the cost can be saved. The first longitudinal reinforcing rib 31 is provided with a first through hole 310 communicating the middle sub-cavity 10 with the left sub-cavity 11, the second longitudinal reinforcing rib 32 is provided with a second through hole 320 communicating the middle sub-cavity 10 with the right sub-cavity 12, when the fan 2 in the middle sub-cavity 10 is used for exhausting air, the air in the left sub-cavity 11 can be circulated to the middle sub-cavity 10 through the first through hole 310, and the air in the right sub-cavity 12 can be circulated to the middle sub-cavity 10 through the second through hole 320, so that the air in the whole cavity can be circulated, and the heat dissipation effect is achieved. In this way, since the fan 2 is only disposed in the middle sub-cavity 10, the air draft in the middle sub-cavity 10 is obviously greater than the air draft in the left sub-cavity 11 and the right sub-cavity 12.
Another arrangement of the fan 2 is to install it in the left and right sub-cavities 11 and 12, respectively, in addition to the middle sub-cavity 10. According to fig. 1, the a1 region generates heat at a higher temperature than the a2 region, and the B1 region and the B2 region are respectively adjacent to the a1 region and the a2 region, and the C1 region and the C2 region are respectively adjacent to the a1 region and the a2 region. Therefore, referring to fig. 3, when the fan 2 is installed, a portion of the fan 2 is disposed in an upper region of the middle sub-cavity 10, and the other portion is disposed in a region of the left sub-cavity 11 adjacent to the middle sub-cavity 10 and a region of the right sub-cavity 12 adjacent to the middle sub-cavity 10. This makes it possible to provide a fan for heat dissipation in accordance with a specific temperature distribution. In this way, the air draft in the middle sub-cavity 10 is still required to be larger than the air draft in the left sub-cavity 11 and the right sub-cavity 12: in the case that the air volume of the single fan 2 is the same, this can be achieved by different numbers of fans 2, for example, 2 fans 20 are installed in the middle sub-cavity 10, and 1 fan 21, 22 is installed in the left sub-cavity 11 and the right sub-cavity 12; under the condition that the number of the installed fans 2 is the same, the installation can be realized by installing the fans 2 with different air volumes, for example, 1 fan with large air volume is installed in the middle sub-cavity 10, and 1 fan with small air volume is respectively installed in the left sub-cavity 11 and the right sub-cavity 12, and compared with the above, the installation of the fan with small air volume is more cost-effective.
Still further, as shown in fig. 4, a transverse reinforcing rib 33 is further disposed on the back plate 1, further dividing the left sub-cavity 11 into a left upper sub-cavity 101 and a left lower sub-cavity 104, dividing the middle sub-cavity 10 into a middle upper sub-cavity 102 and a middle lower sub-cavity 105, and dividing the right sub-cavity 12 into a right upper sub-cavity 103 and a right lower sub-cavity 106, that is, six sub-cavities distributed in two rows and three columns. The six sub-cavities correspond to six temperature distribution regions in fig. 1, respectively, wherein the middle-upper sub-cavity 102 corresponds to a region a1, and the middle-lower sub-cavity 105 corresponds to a region a 2; the upper left sub-cavity 101 corresponds to the B1 region, and the lower left sub-cavity 104 corresponds to the B2 region; the upper right sub-cavity 103 corresponds to the region C1, the lower right sub-cavity 106 corresponds to the region C2, the first sub-cavity comprises the upper sub-cavity 102 and the lower middle sub-cavity 105, and the second sub-cavity comprises the upper left sub-cavity 101, the lower left sub-cavity 104, the upper right sub-cavity 103 and the lower right sub-cavity 106. In the above six sub-cavities, the fans 2 are respectively installed, and according to fig. 1, the heat generation temperature of the a1 region is higher than that of the a2 region, and the B1 region and the B2 region are respectively close to the a1 region and the a2 region, and the C1 region and the C2 region are respectively close to the a1 region and the a2 region. Thus, the fan 202 is located in the upper region of the upper middle sub-cavity 102, the fan 205 is located in the upper region of the lower middle sub-cavity 105, the fan 201 is located in the region of the upper left sub-cavity 101 near the middle sub-cavity 10 (further near the upper middle sub-cavity 102), the fan 204 is located in the region of the lower left sub-cavity 104 near the middle sub-cavity 10 (further near the lower middle sub-cavity 105), the fan 203 is located in the region of the upper right sub-cavity 103 near the middle sub-cavity 10 (further near the upper middle sub-cavity 102), and the fan 206 is located in the region of the lower right sub-cavity 106 near the middle sub-cavity 10 (further near the lower middle sub-cavity 105). Likewise, in this manner, it still needs to be satisfied that the draft volume (sum of draft volumes of the middle upper sub-cavity 102 and the middle lower sub-cavity 105) of the middle sub-cavity 10 is greater than the draft volume (sum of draft volumes of the left upper sub-cavity 101 and the left lower sub-cavity 104) of the left sub-cavity 11 and the draft volume (sum of draft volumes of the right upper sub-cavity 103 and the right lower sub-cavity 106) of the right sub-cavity 12: under the condition that the air volume of the single fan 2 is the same, the air volume can be realized by different numbers of fans 2, for example, 2 fans are respectively installed in the middle upper sub-cavity 102 and the middle lower sub-cavity 105, and 1 fan is respectively installed in the left upper sub-cavity 101 and the left lower sub-cavity 104, and the right upper sub-cavity 103 and the right lower sub-cavity 106; under the condition that the number of the installed fans 2 is the same, the installation can be realized by installing fans 2 with different air volumes, for example, 1 large air volume fan is respectively installed in the middle upper sub-cavity 102 and the middle lower sub-cavity 105, and 1 small air volume fan is respectively installed in the left upper sub-cavity 101 and the left lower sub-cavity 104, the right upper sub-cavity 103 and the right lower sub-cavity 106, and the installation of the small air volume fan is more cost-effective in comparison.
It should be noted that the fan 2 dissipates heat through air draft, so the air draft opening faces the display panel, and the air outlet can face to both sides or back to the display panel according to design. In addition, if the heat pipe is used as a heat dissipation device, the heat pipe can be attached to the back plate of each sub-cavity.
Correspondingly to the first embodiment of the present invention, the second embodiment of the present invention provides a heat dissipation method for a large-size liquid crystal television, including:
step S1, providing a cavity formed between a back plate and a display panel, wherein the cavity comprises a first sub-cavity corresponding to a first heating area on the display panel and a second sub-cavity corresponding to a second heating area on the display panel according to the heating temperature distribution of the display panel, and the average temperature of the first heating area is higher than that of the second heating area;
step S2, installing a plurality of heat dissipation devices in the cavity, where the distribution of the plurality of heat dissipation devices in the cavity satisfies: the heat dissipation capacity of the first sub-cavity is larger than that of the second sub-cavity;
step S3, dissipating heat from the display panel through the plurality of heat dissipation devices.
The heat dissipation method of the large-size liquid crystal display television further comprises the following steps:
the back plate is provided with two longitudinal reinforcing ribs and one transverse reinforcing rib which are parallel to each other and distributed at intervals, the cavity is divided into six sub-cavities which are distributed in two rows and three columns by the two longitudinal reinforcing ribs and the transverse reinforcing ribs, the first sub-cavity comprises a middle upper sub-cavity and a middle lower sub-cavity, and the second sub-cavity comprises a left upper sub-cavity, a left lower sub-cavity, a right upper sub-cavity and a right lower sub-cavity;
and installing part of heat dissipation devices in the upper areas of the middle upper sub-cavity and the middle lower sub-cavity, and installing the other part of heat dissipation devices in the areas of the left upper sub-cavity and the left lower sub-cavity close to the middle sub-cavity and the areas of the right upper sub-cavity and the right lower sub-cavity close to the middle sub-cavity respectively.
Correspondingly to the first embodiment of the present invention, a third embodiment of the present invention further provides a large-size liquid crystal television, including:
a back panel and a display panel;
the cavity is formed between the back plate and the display panel and comprises a first sub-cavity corresponding to a first heating area on the display panel and a second sub-cavity corresponding to a second heating area on the display panel according to the heating temperature distribution of the display panel, and the average temperature of the first heating area is higher than that of the second heating area;
a plurality of heat dissipation devices installed in the cavity, for dissipating heat from the display panel, wherein the distribution of the plurality of heat dissipation devices in the cavity satisfies: the heat dissipation capacity in the first sub-cavity is larger than that in the second sub-cavity.
The back plate is provided with two longitudinal reinforcing ribs and one transverse reinforcing rib which are parallel to each other and distributed at intervals, the cavity is divided into six sub-cavities distributed in two rows and three columns by the two longitudinal reinforcing ribs and the transverse reinforcing ribs, the first sub-cavity comprises a middle upper sub-cavity and a middle lower sub-cavity, and the second sub-cavity comprises a left upper sub-cavity, a left lower sub-cavity, a right upper sub-cavity and a right lower sub-cavity;
and one part of the plurality of heat dissipation devices is arranged in the upper areas of the middle upper sub-cavity and the middle lower sub-cavity, and the other part of the plurality of heat dissipation devices is respectively arranged in the areas of the left upper sub-cavity and the left lower sub-cavity close to the middle sub-cavity and the areas of the right upper sub-cavity and the right lower sub-cavity close to the middle sub-cavity.
As can be seen from the above description, the embodiments of the present invention have the following beneficial effects: by reasonably arranging the heat dissipation device in a targeted manner, the temperature rise caused by long-time use of a large-size liquid crystal television is ensured to be within a reliable range, and the heat dissipation cost is reduced while the temperature of the display panel is reduced.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (7)
1. A heat radiation structure of a large-size liquid crystal display television is characterized by comprising:
the cavity is formed between the back panel and the display panel and comprises a first sub-cavity corresponding to a first heating area on the display panel and a second sub-cavity corresponding to a second heating area on the display panel according to the heating temperature distribution of the display panel, and the average temperature of the first heating area is higher than that of the second heating area;
a plurality of heat dissipation devices installed in the cavity, for dissipating heat from the display panel, wherein the distribution of the plurality of heat dissipation devices in the cavity satisfies: the heat dissipation capacity of the first sub-cavity is larger than that of the second sub-cavity;
the back plate is provided with two longitudinal reinforcing ribs which are parallel to each other and distributed at intervals, the cavity is divided into a middle sub-cavity, a left side sub-cavity positioned on the left side of the middle sub-cavity and a right side sub-cavity positioned on the right side of the middle sub-cavity by the two longitudinal reinforcing ribs, the first sub-cavity is the middle sub-cavity, and the second sub-cavity comprises the left side sub-cavity and the right side sub-cavity;
the heat dissipation device is a fan, the fan is used for dissipating heat of the display panel through air draft, and the air draft amount of the fan in the first sub-cavity is larger than that in the second sub-cavity; the air volume of the single fan positioned in the left side sub-cavity and the right side sub-cavity is smaller than that of the single fan positioned in the middle sub-cavity;
the first longitudinal reinforcing rib is provided with a through hole for communicating the middle sub-cavity with the left sub-cavity, and the second longitudinal reinforcing rib is provided with a through hole for communicating the middle sub-cavity with the right sub-cavity.
2. The heat dissipation structure of large-sized LCD TV as recited in claim 1, wherein one of the heat dissipation devices is located at an upper region of the middle sub-cavity, and the other is located at a region of the left sub-cavity close to the middle sub-cavity and a region of the right sub-cavity close to the middle sub-cavity.
3. The heat dissipation structure of a large-sized lcd tv set according to claim 1, wherein the back plate further has a transverse rib thereon, further dividing the left sub-cavity into a left upper sub-cavity and a left lower sub-cavity, dividing the middle sub-cavity into a middle upper sub-cavity and a middle lower sub-cavity, and dividing the right sub-cavity into a right upper sub-cavity and a right lower sub-cavity, the first sub-cavity includes the middle upper sub-cavity and the middle lower sub-cavity, and the second sub-cavity includes the left upper sub-cavity, the left lower sub-cavity, the right upper sub-cavity and the right lower sub-cavity.
4. The heat dissipation structure of large-sized LCD TV as recited in claim 3, wherein one of the heat dissipation devices is located at an upper region of the middle upper sub-cavity and an upper region of the middle lower sub-cavity, and the other is located at a region of the left upper sub-cavity and the left lower sub-cavity near the middle sub-cavity and a region of the right upper sub-cavity and the right lower sub-cavity near the middle sub-cavity.
5. The heat dissipation structure of large-sized liquid crystal display television according to claim 1, wherein the air volume of the single fan located in the left sub-cavity and the right sub-cavity is smaller than the air volume of the single fan located in the middle sub-cavity.
6. A large-sized liquid crystal television, comprising:
a back panel and a display panel;
the cavity is formed between the back plate and the display panel and comprises a first sub-cavity corresponding to a first heating area on the display panel and a second sub-cavity corresponding to a second heating area on the display panel according to the heating temperature distribution of the display panel, and the average temperature of the first heating area is higher than that of the second heating area;
a plurality of heat dissipation devices installed in the cavity, for dissipating heat from the display panel, wherein the distribution of the plurality of heat dissipation devices in the cavity satisfies: the heat dissipation capacity of the first sub-cavity is larger than that of the second sub-cavity;
the back plate is provided with two longitudinal reinforcing ribs which are parallel to each other and distributed at intervals, the two longitudinal reinforcing ribs divide the cavity into a middle sub-cavity, a left side sub-cavity positioned on the left side of the middle sub-cavity and a right side sub-cavity positioned on the right side of the middle sub-cavity, the first sub-cavity is the middle sub-cavity, and the second sub-cavity comprises the left side sub-cavity and the right side sub-cavity;
the heat dissipation device is a fan, the fan is used for dissipating heat of the display panel through air draft, and the air draft amount of the fan in the first sub-cavity is larger than that in the second sub-cavity; the air volume of the single fan positioned in the left side sub-cavity and the right side sub-cavity is smaller than that of the single fan positioned in the middle sub-cavity;
the first longitudinal reinforcing rib is provided with a through hole for communicating the middle sub-cavity with the left sub-cavity, and the second longitudinal reinforcing rib is provided with a through hole for communicating the middle sub-cavity with the right sub-cavity.
7. The large-size liquid crystal television set according to claim 6, wherein a transverse reinforcing rib is arranged on the back plate, the two longitudinal reinforcing ribs and the transverse reinforcing rib divide the cavity into six sub-cavities distributed in two rows and three columns, the first sub-cavity comprises a middle upper sub-cavity and a middle lower sub-cavity, and the second sub-cavity comprises a left upper sub-cavity, a left lower sub-cavity, a right upper sub-cavity and a right lower sub-cavity;
and one part of the plurality of heat dissipation devices is arranged in the upper areas of the middle upper sub-cavity and the middle lower sub-cavity, and the other part of the plurality of heat dissipation devices is respectively arranged in the areas of the left upper sub-cavity and the left lower sub-cavity close to the middle sub-cavity and the areas of the right upper sub-cavity and the right lower sub-cavity close to the middle sub-cavity.
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