JP2015012300A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device which prevents light leakage from the rear surface side while maintaining heat radiation performance.SOLUTION: A liquid crystal display device according to the invention includes: a front cabinet 30; a back cabinet 50 which covers a rear surface of the front cabinet; a liquid crystal panel which is placed so that a front periphery contacts with the front cabinet; and one or multiple light emitting diodes 62 which radiate light to the liquid crystal panel from the rear surface. The back cabinet includes an inclined surface 52 where an upper surface inclines toward the rear surface side. One or multiple heat radiation holes 53 are opened on the inclined surface so as to penetrate through the inclined surface. A first light shielding plate 54 extending downward on the inner surface side of the back cabinet and a second light shielding plate 55 extending in a rear surface direction on the rear surface side of the back cabinet are provided in each heat radiation hole so as to protrude therefrom.

Description

  The present invention relates to a liquid crystal display device using an LED as a backlight, and more specifically to a liquid crystal display device capable of preventing light leakage from the back side while maintaining heat dissipation. .

  In a liquid crystal display device, an optical sheet such as a diffusion plate, an optical film, or a polarizing plate is laminated on the back surface of a liquid crystal panel, and images and the like are displayed by irradiating a backlight from the back side (for example, Patent Document 1). reference).

  The use of light emitting diodes (LEDs) as the backlight is the mainstream. Since the LED generates heat during light emission, in Patent Document 1, the rear cabinet is made of metal, and the LED and the metal cabinet are connected to each other by a heat radiating member so that heat can be transferred.

JP 2013-84492 A

  However, since it is difficult for a metal cabinet to adopt a complicated structure, the degree of freedom in design is greatly restricted.

  Therefore, it is also assumed that the cabinet on the back side is made of resin and the heat radiation holes are formed only on the back side of the LED substrate. However, this cannot provide a sufficient heat dissipation effect.

  The objective of this invention is providing the liquid crystal display device which can prevent the light leakage from the back side, maintaining heat dissipation.

The liquid crystal display device according to the present invention is
Front cabinet,
A back cabinet covering the back of the front cabinet;
A liquid crystal panel placed so that the front peripheral edge comes into contact with the front cabinet;
One or more light emitting diodes for illuminating the liquid crystal panel from the back;
With
The back cabinet has an inclined surface whose upper surface is inclined toward the back side,
In the inclined surface, one or a plurality of heat radiating holes are opened and opened,
In the heat dissipation hole,
A first light shielding plate extending downward on the inner surface side of the back cabinet;
A second light shielding plate extending in the back direction on the back side of the back cabinet;
Is protruding.

According to the liquid crystal display device of the present invention, the heat radiation hole can block light passing through the heat radiation hole from the inside of the cabinet by the first light shielding plate on the inner surface side of the back cabinet and the second light shielding plate on the rear surface side. Light leakage can be prevented.
Moreover, since the heat radiating hole is provided above the back cabinet, the heat generated inside can be efficiently released.

FIG. 1 is an exploded perspective view of a liquid crystal display device according to the present invention as viewed from the front side. FIG. 2 is an exploded perspective view seen from the back side of the front cabinet and the back cabinet. FIG. 3 is a longitudinal sectional view of the liquid crystal display device according to the present invention. FIG. 4 is a perspective sectional view of the back cabinet of the liquid crystal display device according to the present invention. FIG. 5 is an enlarged perspective sectional view showing the vicinity of the heat radiating hole. FIG. 6 is an enlarged cross-sectional view in the vicinity of the heat dissipation hole.

  Hereinafter, a liquid crystal display device (10) according to an embodiment of the present invention will be described with reference to the drawings.

  As a whole configuration, as shown in FIG. 1, the liquid crystal display device (10) according to the present invention includes a front cabinet (30) on the front side of the panel module (20), a reflective panel (40) and a back cabinet (40) on the back side. 50).

  An opening (56) is formed on the back surface of the back cabinet (50) as shown in FIG. 2, and the liquid crystal display device (10) is controlled in the opening (56) as shown in FIG. A substrate (16) is placed. In FIG. 2, the substrate (16) is not shown in the back cabinet (50).

  A reinforcement plate (51) is attached to the lower part of the liquid crystal display device (10), and the stand (12) can be screwed to make the liquid crystal display device (10) self-supporting.

  The front cabinet (30) is a frame in which a rectangular window (32) is formed. As shown in FIGS. 1 and 3, a panel module (20) is mounted on the front cabinet (30). The panel module (20) is placed on the front cabinet (30) so that the front peripheral edge comes into contact therewith.

  The panel module (20) includes a liquid crystal panel and one or more optical sheets stacked on the back side of the liquid crystal panel. In addition to these, a protective sheet or the like may be attached or laminated. In the illustrated embodiment, the peripheral edge of the panel module (20) is covered with a plurality of frames (22).

  As shown in FIGS. 1 to 3, the back cabinet 50 can be formed in a concave shape on the back side.

  The back cabinet (50) has an inclined surface (52) whose upper surface is inclined toward the back side. As will be described later, a heat radiating hole (53) is formed through the inclined surface (52).

  A plurality of ribs (57) project from the back surface to the front surface side of the back cabinet (50). These ribs (57) are fitted with a bridge (68) for attaching a backlight (60) described later. By forming the ribs (57) more densely than necessary, it is possible to widen the selection range of the mounting position and the number of installed bridges (68) according to the backlight (60).

  The bottom surface of the back cabinet (50) has a shape in which the left and right sides swell toward the back surface, and the speaker (14) is disposed therein as shown in FIG. The back cabinet (50) is provided with a plurality of audio output holes (58) on the lower surface facing the speaker (14).

  As shown in FIG. 1, a backlight (60) is arranged on the front side of the back cabinet (50). An LED (light emitting diode) (62) can be employed as the backlight (60). The LEDs (62) can be arranged at predetermined intervals on a plurality of bridges (68) suspended in the left-right direction of the back cabinet (50). The LED (62) is mounted on the LED substrate (64), and is electrically connected to the above-described substrate (16) to control light emission.

  The LEDs (62) can be arranged at predetermined intervals via a plurality of bridges (68) suspended in the left-right direction of the back cabinet (50) via LED substrates (64). The bridge (68) is fixed to the aforementioned rib (57) by screwing or the like. The bridge (68) is made of metal and is bent with the side portion along the longitudinal direction facing rearward. By making the U-shaped cross section toward the back, the heat dissipation of the LED (62) and the strength of the bridge (68) itself can be enhanced as much as possible.

  As shown in FIGS. 1 to 3, the front side of the back cabinet (50) is covered with a reflective panel (40) so that the light emitted from the LED (62) is efficiently applied to the panel module (20). . The reflection panel (40) is white on the front side to increase the light reflection efficiency, and a plurality of LED holes (42) through which the LEDs (62) project are opened. The reflective panel (40) has a horizontal length that is substantially the same as that of the back cabinet (50), and the vertical length is equivalent to the amount of the speaker (14) disposed in the back cabinet (50). Shorter than the back cabinet (50).

  The reflection panel (40) having the above configuration can be attached to the back cabinet (50) such that the LED (62) is exposed from the LED hole (42).

  As shown in FIGS. 4 to 6, a heat radiating hole (53) is formed through the inclined surface (52) of the back cabinet (50). The heat radiation hole (53) is a hole for releasing heat generated inside the back cabinet (50), for example, heat generated from the LED (62) to the outside. The heat radiating hole (53) can be exemplified by a hole having a rectangular cross section as shown in an enlarged view in FIGS. 5 and 6, but may be a circular cross section, an elliptical shape or the like.

  As shown in FIG. 5, a plurality of heat radiation holes (53) can be formed in a row in the left-right direction on the upper surface of the back cabinet (50). The heat radiation effect can be further enhanced by forming a plurality of rows of the heat radiation holes (53).

  When the LED (62) is caused to emit light, the light of the LED (62) illuminates the back cabinet (50) side through the LED hole (42) and the like of the reflection panel (40). These lights may leak out through the heat radiating holes (53). In a bright room, etc., the leaked light does not affect much, but in a dark room, especially when the back cabinet (50) is close to the wall, the leaked light may illuminate the wall. .

  Therefore, in the present invention, the first light shielding plate (54) protrudes from the inner surface side of the back cabinet (50) and the second light shielding plate (55) protrudes from the rear surface side of the back cabinet (50). Has been established.

  The first light shielding plate (54) extends downward from the inner surface side of the inclined surface (52) of the back cabinet (50), and is preferably formed so that the tip is vertically downward. As shown in FIG. 4, the first light shielding plate (54) is preferably formed continuously across a plurality of heat radiation holes (53) adjacent to the left and right. Thereby, compared with the case where the first light shielding plate (54) is formed for each heat radiating hole (53), the light shielding efficiency from the left and right directions can be increased, and the strength of the first light shielding plate (54) is also increased. be able to.

  The second light shielding plate (55) extends from the back surface side of the inclined surface (52) of the back cabinet (50) toward the back surface, and is preferably formed so that the tip is horizontal. As shown in FIG. 4, the second light shielding plate (55) is also preferably formed continuously over a plurality of heat radiation holes (53) adjacent to the left and right. Thereby, compared with the case where the 2nd light-shielding plate (55) is formed for every heat radiating hole (53), the shielding efficiency of the light which passed the heat radiating hole (53) can be improved.

  In the illustrated embodiment, the first light shielding plate (54) and the second light shielding plate (55) are formed by resin molding integrally with the back cabinet (50). The first light shielding plate (54) and / or the second light shielding plate (55) may be formed separately from the back cabinet (50) and attached to the back cabinet (50) by screwing or bonding.

  The first shading plate (54) and the second shading plate (55) are provided as shown in FIG. 6 in order to prevent light leaking from the back cabinet (50) through the heat radiation hole (53). When the tips of the first light shielding plate (54) and the second light shielding plate (55) are connected with a virtual line A, the inner lower end (53a) of the back cabinet (50) of the heat radiation hole (53) is It is very preferable to form it so as to be positioned on the upper side of the inner surface with respect to A or the virtual line A.

  However, by providing the first light shielding plate (54) and the second light shielding plate (55) in the heat radiation hole (53), even if the light of the LED (62) leaks from the reflection panel (40), the heat radiation hole ( Light from the front or obliquely upward toward 53) hits the first light shielding plate (54) and is blocked. Further, a part of the light from obliquely below reaches the heat radiating hole (53), but most of the light hits the inner surface of the heat radiating hole (53) and is shielded. It is shielded by the plate (55). Therefore, it is possible to prevent the internal light from leaking from the back cabinet (50) to the back side.

  Since the first light shielding plate (54) is formed so as to protrude downward, the heat generated in the back cabinet (50) can be guided to the heat radiating hole (53), and the heat radiating efficiency is improved. be able to.

  The above description is for explaining the present invention, and should not be construed as limiting the invention described in the claims or limiting the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope described in the claims.

  For example, in FIG. 6 and the like, the first light shielding plate (54) and the second light shielding plate (55) have substantially the same length, but these lengths may be changed. In this case, it is preferable that the second light shielding plate (55) exposed to the outside is shortened and the first light shielding plate (54) in the back cabinet (50) is formed long.

  In addition, the configuration and structure of the liquid crystal display device (10) are merely examples, and of course are not limited to the above-described embodiment.

(10) Liquid crystal display device
(20) Panel module
(30) Front cabinet
(40) Reflector panel
(50) Back cabinet
(52) Inclined surface
(53) Heat dissipation hole
(54) First shading plate
(55) Second shading plate
(62) LED

Claims (4)

Front cabinet,
A back cabinet covering the back of the front cabinet;
A liquid crystal panel placed so that the front peripheral edge comes into contact with the front cabinet;
One or more light emitting diodes for illuminating the liquid crystal panel from the back;
With
The back cabinet has an inclined surface whose upper surface is inclined toward the back side,
In the inclined surface, one or a plurality of heat radiating holes are opened and opened,
In the heat dissipation hole,
A first light shielding plate extending downward on the inner surface side of the back cabinet;
A second light shielding plate extending in the back direction on the back side of the back cabinet;
Is protruding,
A liquid crystal display device characterized by the above. The heat radiating hole is located on the imaginary line connecting the tips of the first light-shielding plate and the second light-shielding plate at the inner lower end of the back cabinet or on the inner surface upper side than the virtual line.
The liquid crystal display device according to claim 1. A plurality of the heat dissipation holes are opened in a row in the left-right direction of the upper surface of the back cabinet,
The first light-shielding plate and / or the second light-shielding plate are continuously formed across a plurality of the heat radiation holes adjacent to the left and right.
The liquid crystal display device according to claim 1. The back cabinet is made of resin.
The liquid crystal display device according to claim 1.

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