KR20210016116A - Back light unit and display apparatus having the same - Google Patents

Abstract

According to an embodiment of the present invention, a backlight unit includes: an optical module including a light source part in which a plurality of light sources are disposed, a diffuser plate disposed on one side of the light source part to diffuse light from the light sources, and at least one optical sheet disposed on one side of the diffuser plate to collect and spread the light having passed through the diffuser plate, in one direction; and a cover bottom including a bottom part in which the optical module is placed, and a side wall part erected from the outer circumference of the bottom part to surround a side part of at least one part of the optical module. A plate screw thread is formed on the outer surface of the diffuser plate, and an inner screw thread is formed on the inner surface of the side wall part so as to enable the diffuser plate to be screw-joined to the cover bottom. Therefore, the present invention is capable of obtaining durability due to simple and substantial screw-coupling.

Description

A backlight unit and a display device having the same {BACK LIGHT UNIT AND DISPLAY APPARATUS HAVING THE SAME}

The present invention relates to a backlight unit and a display device having the same, and more particularly, the coupling of the cover bottom and the diffuser plate, and the coupling of the cover bottom and the guide panel by a simple and robust method of screw joint (screw joint). The present invention relates to a backlight unit and a display device including the same, which can obtain durability while being combined and improve assembly efficiency.

A display device, which is a type of device for displaying an image, is a device that displays an image using a display panel, and is used in various devices such as a television, a computer monitor, a smart phone, and various smart pads.

However, since a general display device cannot emit light by itself, a separate light source such as a backlight unit is required, and such a backlight unit is generally disposed behind the display panel.

The backlight unit can be classified into an edge type method that requires a light guide panel (LGP) that uniformly guides light irradiated from a light source to a display panel, and a direct type type that does not require a light guide plate. The direct type backlight unit in which the light source is disposed directly under the display panel may not use a light guide plate.

Meanwhile, in recent years, not only a rectangular display device but also a circular display device has been developed and applied to a small edge model such as a smart watch or a smart thermometer.

However, in such a circular display device, since the light source has a structure in which the light source is located on the side of the light guide plate, a straight section to place the light source is required. There is a difficult problem.

In addition, in the case of the direct type backlight unit, the guide panel and the cover bottom are generally fastened by a hook method. However, when such a backlight unit is mounted on a vehicle, there may be a problem in that the coupling is released or noise is generated due to vibration generated when the vehicle is driven. In other words, a solid fixation could not be made.

Therefore, the guide panel and the cover bottom are fastened by a simple method, but while maintaining the rigidity between the couplings, a separate straight section for arranging the light source is not required. Development of a display device is required.

As related prior art, there is Korean Patent Application No. 10-2015-0169188 (name of invention: display, filing date: November 30, 2015).

In an embodiment of the present invention, the combination of the cover bottom and the diffuser plate, and the combination of the cover bottom and the guide panel are coupled by a simple yet sturdy method of screwing, so that durability can be obtained and the efficiency of assembly can be improved. A backlight unit capable of having a circular yet thin bezel because a separate section for arranging a light source is not required, and a display device having the same are provided.

A backlight unit according to an embodiment of the present invention includes a light source unit in which a plurality of light sources are disposed, a diffuser plate disposed on one side of the light source unit to disperse light from the light source, and a diffuser plate disposed on one side of the diffuser plate. An optical module including at least one optical sheet for condensing and diffusing light that has passed through the diffuser plate in one direction, and a bottom portion on which the optical module is seated, and is erected from an outer edge of the bottom portion of the optical module. It includes a cover bottom including a sidewall portion surrounding at least a portion of the sidewall, and a plate thread is formed on the outer surface of the diffuser plate, and an inner thread is formed on the inner surface of the sidewall portion, so that the cover bottom is The diffuser plate can be screw jointed.

In addition, the backlight unit according to an embodiment of the present invention may further include a guide panel screwed to the cover bottom on which the optical module is mounted.

In addition, the guide panel according to an embodiment of the present invention may extend in a horizontal direction from an upper end of the panel sidewall portion and the panel sidewall portion having panel threads corresponding to the outer threads formed on the outer surface of the sidewall portion of the cover bottom. It may include a panel horizontal portion for fixing the optical sheet of the optical module.

In addition, the plate thread, the inner thread, the outer thread, and the panel thread according to the embodiment of the present invention may be a triangular thread, a semicircular thread, a trapezoidal thread, or a serrated thread.

In addition, the diffuser plate according to an embodiment of the present invention includes a plate member having a diameter corresponding to an inner diameter of the cover bottom so as to be positioned inside the cover bottom and extending in a transverse direction from an outer edge of the plate member to be positioned inside the cover bottom. It may include a plate sidewall portion to be formed.

In addition, the diffuser plate according to the embodiment of the present invention may be manufactured by injection molding using polycarbonate (PC), polymethyl methacrylate (PMMA), polystyrene (PS), and styrene methacrylic acid (MS).

In addition, the cover bottom according to an embodiment of the present invention may be manufactured by using aluminum or magnesium in a die-casting method.

In addition, the at least one optical sheet according to an embodiment of the present invention is two optical sheets having a laminated structure, and each of the two optical sheets includes a protruding chamfer seated on a seating portion formed at an upper end of the cover bottom. And, when the two optical sheets are stacked, the protruding chamfer of the lower optical sheet may be provided with an exposed portion exposed from the protruding chamfer of the upper optical sheet so that the protruding chamfer of the lower optical sheet is visible. .

In addition, the light source unit according to an embodiment of the present invention may be a direct type LED array in which a light emitting diode (LED) is provided as the light source.

Meanwhile, a display device according to an embodiment of the present invention includes a backlight unit and a circular display panel coupled to the backlight unit, wherein the backlight unit includes a light source unit on which a plurality of light sources are disposed, and is disposed on one side of the light source unit. An optical module and the optical module including a diffuser plate for dispersing light from the light source, and at least one optical sheet disposed on one side of the diffuser plate to condense and diffuse the light passing through the diffuser plate in one direction And a cover bottom including a bottom portion to be seated and a sidewall portion that is erected from an outer edge of the bottom portion and surrounds at least a portion of the side of the optical module, and a plate thread is formed on the outer surface of the diffuser plate, and the An inner thread is formed on the inner surface of the sidewall portion so that the diffuser plate may be screwed with respect to the cover bottom.

In addition, the backlight unit according to an embodiment of the present invention may further include a guide panel screwed to the cover bottom on which the optical module is mounted.

In addition, the guide panel according to an embodiment of the present invention may extend in a horizontal direction from an upper end of the panel sidewall portion and the panel sidewall portion having panel threads corresponding to the outer threads formed on the outer surface of the sidewall portion of the cover bottom. It may include a panel horizontal portion for fixing the optical sheet of the optical module.

In addition, the plate thread, the inner thread, the outer thread, and the panel thread according to the embodiment of the present invention may be a triangular thread, a semicircular thread, a trapezoidal thread, or a serrated thread.

According to an embodiment of the present invention, the combination of the cover bottom and the diffuser plate, and the combination of the cover bottom and the guide panel are coupled by a simple and robust method of screwing, thereby obtaining durability and improving the efficiency of assembly, In addition, since a separate section for arranging the light source is not required, it may have a circular yet thin bezel.

1 is an exploded perspective view of a display device according to an embodiment of the present invention.
2 is a partial cross-sectional view for explaining a coupling structure as a coupling diagram of FIG. 1.
3 is an exploded perspective view of a cover bottom, a diffuser plate and a guide panel shown in FIG. 2.
FIG. 4 is a perspective view illustrating threads of the cover bottom, the diffuser plate, and the guide panel illustrated in FIG. 3 from different angles for convenience of explanation.
5 is a perspective view and a partially enlarged view of the cover bottom shown in FIG. 1.
6 is a perspective view and a partially enlarged view of the diffuser plate shown in FIG. 1.
7 is a view showing the front and rear surfaces of the LED array shown in FIG.
8 is a perspective view and a partially enlarged view of the guide panel shown in FIG. 1 viewed from the rear.
FIG. 9 is a diagram for explaining a bonding structure of two optical sheets shown in FIG. 1.
10 is a view and a partially enlarged view for explaining a structure in which the optical sheets shown in FIG. 9 are seated on a seating portion of a cover bottom.

Advantages and/or features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described later in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same elements throughout the specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view of a display device according to an exemplary embodiment of the present invention, FIG. 2 is a partial cross-sectional view illustrating a coupling structure as a coupling diagram of FIG. 1, and FIG. 3 is a cover bottom and a diffuser plate shown in FIG. And an exploded perspective view of the guide panel, and FIG. 4 is a perspective view showing the threads of the cover bottom, the diffuser plate, and the guide panel shown in FIG. 3 from different angles for convenience of explanation, and FIG. 5 is a cover bottom shown in FIG. Is a perspective view and a partially enlarged view of, FIG. 6 is a perspective and partially enlarged view of the diffuser plate shown in FIG. 1, FIG. 7 is a view showing the front and rear surfaces of the LED array shown in FIG. 1, and FIG. 8 is It is a perspective view and a partially enlarged view of the guide panel shown in FIG. 1 as viewed from the rear, FIG. 9 is a view for explaining a coupling structure of the two optical sheets shown in FIG. 1, and FIG. 10 is a diagram of the optical sheets shown in FIG. It is a drawing and a partial enlarged view for explaining a structure that is seated on a seating portion of a cover bottom.

As shown in these drawings, the display device 100 according to an embodiment of the present invention is a circular display device 100, and may include a circular display panel 170 and a backlight unit 101. .

1 and 2, the backlight unit 101 of the present embodiment includes an optical module including a light source unit 120, a cover bottom 110 on which the optical module is mounted, and a cover bottom. It may include a guide panel 150 (Guide Panel) coupled to 110).

The backlight unit 101 of this embodiment, which will be described later, has a structure that is coupled to each other by screwing, so that simple assembly is possible, and the optical module is firmly fixed by the cover bottom 110 and the guide panel 150. I can. In addition, since the light source of the backlight unit 101 is configured as a direct type, a thin bezel may be implemented.

When describing each configuration, first, the light source unit 120 of this embodiment is an LED array 120 (LED Array) provided with a light emitting diode (LED) as a light source, as shown in FIGS. 2 and 7. As described above, a plurality of light emitting diodes 121, a printed circuit board 123 on which they are regularly arranged, and a flexible circuit board 125 electrically connected to the light emitting diodes 121 may be included.

The LED array 120 may be mounted on the bottom portion of the cover bottom 110 to provide light toward the diffuser plate. Due to this light source structure, the backlight unit 101 of the present embodiment may be implemented as a direct type backlight unit 101.

As described above, in the case of the circular display device 100, when the edge-type method rather than the direct-type method is applied, a straight section for installing the edge-type light source is required, thus implementing the circular display device 100 There was a limit.

By the way, in the case of the present embodiment, as shown in FIG. 7, the printed circuit board 123 of the LED array 120 is provided in a circular shape corresponding to the display panel 170, and also covers all areas of the printed circuit board 123. Since the light emitting diodes 121 are regularly arranged, uniform light can be provided, and thus a circular display device 100 can be implemented.

The LED array 120 may be seated on the inside of the cover bottom 110 as shown in FIG. 2 to maintain a stable coupling state.

Meanwhile, as shown in FIG. 2, the optical module of this embodiment may include the aforementioned LED array 120, a diffuser plate 130, and a plurality of optical sheets 140; 141, 145. With this configuration, light generated from the LED array 120 may pass through the diffuser plate 130 and the optical sheets 141 and 145 to be provided to the display panel 170.

The diffuser plate 130 of the present embodiment, as shown in FIGS. 1 and 2, is disposed above the LED array 120 and has a circular shape corresponding to the printed circuit board 123 of the LED array 120. . The diffuser plate 130 may convert light in the form of a point provided from the plurality of light emitting diodes 121 of the LED array 120 into light in the form of a plane.

Incidentally, the diffuser plate 130 of this embodiment is a plate having a diameter corresponding to the inner diameter of the cover bottom 110 so as to be located inside the cover bottom 110 as shown in FIGS. 2, 4 and 6 A member 131 and a plate sidewall portion 135 extending in a horizontal direction from an outer edge of the plate member 131 may be included.

A plate thread 136 is formed on the plate sidewall portion 135 so that the diffuser plate 130 may be screwed to the cover bottom 110, which will be described in detail when describing the cover bottom 110.

The diffuser plate 130 may be manufactured by injection molding using polycarbonate (PC), polymethyl methacrylate (PMMA), polystyrene (PS), and styrene methacrylic acid (MS), but is not limited thereto. , It is natural that it can be manufactured by a different material or a different manufacturing method.

The plurality of optical sheets 140, for example, the two optical sheets 141 and 145 of the present embodiment, are disposed in a stacked structure on the upper surface of the diffuser plate 130, and are diffused provided from the diffuser plate 130. Light may be condensed and diffused in one direction, that is, in the direction of the display panel 170.

As such, the optical module of the present embodiment has a structure that is seated on the cover bottom 110 by having a shape corresponding to the inner structure of the cover bottom 110, but the binding of the optical module to the cover bottom 110 if only seated Since this can be released, the diffuser plate 130 of the optical module may have a structure that is screwed to the cover bottom 110.

Accordingly, the coupling of the cover bottom 110 to the diffuser plate 130 and the LED array 120 placed under the diffuser plate 130 can be firmly maintained.

The cover bottom 110 of the present embodiment is a frame on which the optical module is mounted as described above, and as shown in FIG. 5, the bottom part 111 on which the optical module is mounted and the bottom part 111 stand up from the outer edge It may include a sidewall portion 115 formed to support a side portion of the optical module.

2 and 4, the LED array 120 is seated on the bottom portion 111 of the cover bottom 110, and the diffuser plate 130 is screwed to the sidewall portion 115 of the cover bottom 110 Can be.

To this end, an inner thread 117 is formed along the helical direction on the inner surface of the side wall portion 115, and a plate thread 136 is formed on the outside of the diffuser plate 130 to form a diffuser plate on the cover bottom 110. 130) can be combined.

That is, by engaging the plate thread 136 formed on the plate side wall portion 135 of the diffuser plate 130 with the inner thread 117 formed on the side wall portion of the cover bottom 110, and then rotating the diffuser plate 130, the cover The diffuser plate 130 to the bottom 110 can be screwed.

Here, the inner threads 117 and the plate threads 136 are formed as threads corresponding to shapes so as to be mutually fastened, and for example, may be formed as threads having a triangular cross section or a semicircular thread. However, the present invention is not limited thereto, and it is natural that it may be formed in a shape such as a trapezoidal thread or a serrated thread.

2 and 4, a stepped portion 116 is formed at the lower end of the sidewall portion 115 on which the inner thread 117 is formed, so that the lower end of the plate sidewall portion 135 of the diffuser plate 130 is stepped. It can be bound up to the portion 116 (see FIG. 2 ), and thus the coupling of the diffuser plate 130 to the cover bottom 110 can be kept firmly.

The above-described cover bottom 110 may be manufactured by a die-casting method of aluminum or magnesium, but is not limited thereto, and it is natural that the cover bottom 110 may be manufactured by a different material or a different manufacturing method.

Meanwhile, referring to FIGS. 9 and 10, two optical sheets 141 and 145 may be mounted on the cover bottom 110 in a state in which the diffuser plate 130 is coupled to the cover bottom 110.

As described above, the plurality of optical sheets 141 and 145 of the present exemplary embodiment are two optical sheets 141 and 145 having a laminated structure, and may have substantially corresponding shapes as shown in FIG. 9.

Incidentally, the two optical sheets 141 and 145 may be provided with protruding chamfers 141a and 145a respectively mounted on the seating portion 119 formed on the upper end of the cover bottom 110. Here, when the two optical sheets 141 and 145 are stacked, the protruding chamfer 145a of the optical sheet 145 placed at the lower part is visible so that the protruding chamfer 145a of the optical sheet 145 placed at the lower portion is at the upper portion. An exposed portion 145b that is exposed from the protruding chamfer 141a of the optical sheet 141 placed on it is provided.

Therefore, when the two optical sheets 141 and 145 are overlapped, as shown in FIG. 9, the exposed portion 145b formed in the protruding chamfer 145a of the optical sheet 145 placed on the lower side is the optical sheet ( It can be seen that the two optical sheets 141 and 145 are disposed on the cover bottom 110 by being exposed to the protruding chamfer 141a of the 141.

On the other hand, after mounting the two optical sheets 141 and 145 on the mounting portion 119 of the cover bottom 110, as schematically shown in FIGS. 1, 2 and 4, the cover bottom 110 The guide panel 150 may be screwed.

In the side wall portion 115 of the cover bottom 110 described above, an inner thread 117 is formed on the inside, and an outer thread 118 is formed on the outside. In addition, the guide panel 150 may have a thread structure corresponding to the outer thread 118 of the cover bottom 110.

Incidentally, the guide panel 150 of this embodiment has a ring shape as a whole, as shown in FIGS. 4 and 8, and a panel thread 153 corresponding to the outer thread 118 of the cover bottom 110 is formed. A panel sidewall portion 151 and a panel horizontal portion 155 extending from an upper end of the panel sidewall portion 151 in a horizontal direction, that is, in a center direction of a circle, to fix the optical sheet 140 may be included.

By the configuration of the guide panel 150, after disposing the guide panel 150 on the cover bottom 110 of the backlight unit having a partially coupled structure in the state of FIG. 10, the guide panel 150 is guided to the cover bottom 110. By rotating the panel 150, the guide panel 150 can be easily and firmly coupled to the cover bottom 110.

Here, the outer threads 118 and the panel threads 153 are formed as threads corresponding to shapes so as to be mutually fastened, and for example, may be formed as threads having a triangular cross section or a semicircular thread. However, it is not limited thereto.

As illustrated in FIG. 2, the panel horizontal portion 155 may be placed on the outer edge of the optical sheet 140 to prevent the optical sheet 140 from flowing or detaching. In addition, the display panel 170 may be mounted on the horizontal panel portion 155.

As described above, according to an embodiment of the present invention, the coupling of the cover bottom 110 and the diffuser plate 130 and the coupling of the cover bottom 110 and the guide panel 150 is performed by a simple yet robust method of screwing. By combining, durability can be obtained, and the efficiency of assembly can be improved.

In addition, since a separate section for arranging the light source is not required, the display device 100 having a circular and thin bezel can be implemented.

Although the specific embodiments according to the present invention have been described so far, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by being limited to the described embodiments, and should be defined not only by the claims to be described later, but also by the claims and their equivalents.

As described above, although the present invention has been described by the limited embodiments and drawings, the present invention is not limited to the above embodiments, which is various modifications and variations from these descriptions to those of ordinary skill in the field to which the present invention belongs. Transformation is possible. Accordingly, the idea of the present invention should be grasped only by the scope of the claims set forth below, and all equivalent or equivalent modifications thereof will be said to belong to the scope of the idea of the present invention.

100: display device
101: backlight unit
110: cover bottom
111: bottom part
115: side wall portion
117: internal thread
118: external thread
120: LED array
121: light-emitting diode
130: diffuser plate
136: plate thread
140: optical sheet
141: optical sheet placed on top
145: optical sheet placed underneath
150: guide panel
153: panel thread
170: display panel

Claims (13)

A light source unit in which a plurality of light sources are disposed, a diffuser plate disposed on one side of the light source to disperse light from the light source, and a diffuser plate disposed on one side of the diffuser plate to direct light passing through the diffuser plate in one direction An optical module including at least one optical sheet for condensing and diffusing light; And
A cover bottom including a bottom portion on which the optical module is seated, and a sidewall portion standing up from an outer edge of the bottom portion and surrounding at least a portion of the optical module;
Including,
A plate thread is formed on an outer surface of the diffuser plate, and an inner thread is formed on an inner surface of the sidewall portion, so that the diffuser plate is screwed with respect to the cover bottom.
The method of claim 1,
A guide panel screwed to the cover bottom on which the optical module is mounted;
It characterized in that it further comprises, the backlight unit.
The method of claim 2,
The guide panel,
A panel sidewall portion having a panel thread corresponding to an outer thread formed on an outer surface of the sidewall portion of the cover bottom; And
And a panel horizontal portion extending in a horizontal direction from an upper end of the panel sidewall portion to fix the optical sheet of the optical module.
The method of claim 3,
The plate thread, the inner thread, the outer thread, and the panel thread are triangular threads, semicircular threads, trapezoidal threads, or serrated threads.
The method of claim 1,
The diffuser plate,
A plate member having a diameter corresponding to an inner diameter of the cover bottom so as to be positioned inside the cover bottom; And
And a plate sidewall portion extending in a horizontal direction from an outer edge of the plate member to form the plate thread.
The method of claim 5,
The diffuser plate is made of polycarbonate (PC), polymethyl methacrylate (PMMA), polystyrene (PS), and styrene methacrylic acid (MS) by injection molding.
The method of claim 1,
The cover bottom is characterized in that the die-casting (Die-Casting) method of aluminum or magnesium, the backlight unit.
The method of claim 1,
The at least one optical sheet is two optical sheets having a laminated structure,
Each of the two optical sheets has a protruding chamfer that is seated on a seating portion formed at an upper end of the cover bottom,
When the two optical sheets are stacked, the protruding chamfer of the lower optical sheet is provided with an exposed portion exposed from the protruding chamfer of the upper optical sheet so that the protruding chamfer of the lower optical sheet is visible. Backlight unit.
The method of claim 1,
The light source unit, characterized in that the direct-type LED array (LED Array) in which a light emitting diode (LED) is provided as the light source, the backlight unit.
Backlight unit; And
A circular display panel coupled to the backlight unit;
Including,
The backlight unit,
A light source unit in which a plurality of light sources are disposed, a diffuser plate disposed at one side of the light source unit to disperse light from the light source, and a diffuser plate disposed at one side of the diffuser plate to condense and diffuse light passing through the diffuser plate in one direction An optical module including at least one optical sheet to allow; And
A cover bottom including a bottom portion on which the optical module is seated, and a sidewall portion that is erected from an outer edge of the bottom portion and surrounds a side portion of at least a portion of the optical module;
Including,
A display device, wherein a plate thread is formed on an outer surface of the diffuser plate, and an inner thread is formed on an inner surface of the sidewall portion, so that the diffuser plate is screwed with respect to the cover bottom.
The method of claim 10,
The backlight unit,
A guide panel screwed to the cover bottom on which the optical module is mounted;
It characterized in that it further comprises, a display device.
The method of claim 11,
The guide panel,
A panel sidewall portion having a panel thread corresponding to an outer thread formed on an outer surface of the sidewall portion of the cover bottom; And
And a panel horizontal portion extending in a horizontal direction from an upper end of the panel sidewall portion to fix the optical sheet of the optical module.
The method of claim 12,
The plate thread, the inner thread, the outer thread, and the panel thread are triangular threads, semicircular threads, trapezoidal threads, or serrated threads.

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