KR20200110572A - Middle frame and display apparatus having the same - Google Patents

Abstract

The present invention relates to a middle frame of a display device and a display device including the same, wherein the middle frame for a display device of the present invention has a rectangular frame shape and an upper surface thereof is a horizontal portion providing a sheet seating surface on which an optical sheet is mounted, the A light guide portion extending downwardly inclined at an inner end of the horizontal portion, and an end portion forming an optical mixing space between the light guide plate and the optical sheet, and a vertical direction from the outer end of the horizontal portion of the light incident portion region It is characterized in that it includes a vertical portion that is extended and coupled to the cover bottom.

Description

Middle frame and display apparatus including the same

The present invention relates to a middle frame of a display device and a display device including the same.

In general, a display device is a device that receives and displays an image signal, and includes a TV or a monitor, and is a liquid crystal display device (LCD) and an organic light emitting device (OLED) as a means for displaying an image. Emitting Display), plasma display device (PDP: Plasma Display Panel), etc. are used.

Unlike other display devices, LCDs do not emit light on their own, and therefore require a separate external light source in order to realize high-quality images. Accordingly, the LCD further includes a backlight unit of a surface light source in addition to the liquid crystal panel, and the backlight unit uniformly supplies a high-intensity light source to the liquid crystal panel, thereby realizing an image. As described above, the backlight unit refers to a surface lighting device for realizing an image of a display device such as an LCD, and is classified into a direct lighting type or an edge lighting type according to a position where a light source is disposed. As a light source of the backlight unit, a light emitting diode (hereinafter referred to as'LED') having advantages such as small size, low power consumption, and high reliability is mainly used.

1 is a combined cross-sectional view showing the main configuration of a display device according to the prior art.

As shown, in the display device, a reflective sheet 12, a light guide plate 13 and an optical sheet 14 are sequentially stacked inside the cover bottom 11, and an LED module 15 is disposed on the side of the light guide plate 13 do. In addition, the guide panel 16 is coupled along the four sides of the cover bottom 11 while fixing the optical sheet 14. In addition, after the liquid crystal panel 17 is disposed on the front surface of the optical sheet 14, the case top 18 is coupled to the guide panel 16 to fix the liquid crystal panel 17. The cover bottom 11, the reflective sheet 12, the light guide plate 13, the optical sheet 14, and the LED module 15 constitute a backlight unit that provides light from a surface light source to the liquid crystal panel 17.

In such a display device, the light emitted from the LED 15b is converted to a surface light source while repeating total reflection inside the light guide plate 13 to be emitted to the top surface, and the brightness and uniformity are improved while passing through the optical sheet 14 to improve high-quality light. Is provided to the liquid crystal panel 17. In this case, the conventional display device has a structure in which the optical sheet 14 is directly mounted on the upper surface of the light guide plate 13.

Accordingly, in a conventional display device, the pattern on the upper surface of the light guide plate 13 may be easily damaged due to friction between the light guide plate 13 and the optical sheet 14, or foreign matter may be generated due to friction. Damage to the pattern and foreign matter appear as hot spots or dark areas between the light guide plate 13 and the optical sheet 14, causing changes and deterioration of the optical characteristics of the surface light source, and consequently, is a factor deteriorating the image quality of the display device. . In recent years, as display devices are required to be made larger, slimmer, and lighter, and higher quality and higher definition of image quality are required, the problem of deteriorating optical characteristics is becoming more serious.

In addition, in the conventional display device, since light leaking from the side of the light guide plate 13 in the area of the light guide plate 13 does not contribute to the luminance and disappears, there is a problem in that light use is not efficiently performed.

The present invention has been proposed to solve the above problems, and an object of the present invention is to provide a display device capable of preventing deterioration of optical characteristics due to friction between a light guide plate and an optical sheet.

Another object of the present invention is to provide a display device capable of improving light utilization efficiency by inducing light leaking to the side of the light guide plate to be emitted to the front.

The middle frame for a display device of the present invention for achieving the above object has a horizontal portion that forms a square frame shape and provides a sheet seating surface on which an optical sheet is seated, and the end thereof extends from an inner end of the horizontal portion. And a light guide part forming a light mixing space between the light guide plate and the optical sheet while pressing the light guide, and a vertical part extending in a vertical direction from an outer end of the horizontal part of the light incident part region and coupled to the cover bottom, and the light The guide part is characterized in that a plurality of light-transmitting holes are formed to communicate the lower space of the horizontal part with the light mixing space.

In addition, the light guide part is characterized in that it extends in a downward slope from an inner end of the horizontal part.

In addition, the light guide portion is characterized in that it forms a curved shape protruding convexly inward.

In addition, the light guide portion is divided into multiple stages and is characterized in that it forms a multi-stage curved surface that is convex inwardly.

In addition, the display device of the present invention for achieving the above object includes a cover bottom forming a storage space therein, a light guide plate disposed inside the cover bottom, and a light source disposed on at least one side of the light guide plate inside the cover bottom. A middle frame that fixes the light guide plate while being fastened to the cover bottom along the edge of the cover bottom in the shape of a module and a square frame, and provides a sheet seating surface at a position spaced apart from the light guide plate on the upper surface, and light mixing between the light guide plate An optical sheet whose edge is seated on the sheet seating surface while forming a space, a guide panel that is fastened to the cover bottom along the edge of the cover bottom of the carrying-in light portion area and provides a panel seating surface on the upper surface, and the panel seating surface It characterized in that it comprises a liquid crystal panel coupled to the guide panel while seated on.

Here, the middle frame is formed in a rectangular frame shape while the upper surface is a horizontal portion providing a sheet seating surface on which the optical sheet is seated, and extending from an inner end portion of the horizontal portion to press the light guide plate and between the light guide plate and the optical sheet. And a light guide part forming an optical mixing space in the light-incident part, and a vertical part extending in a vertical direction from an outer end of the horizontal part of the light incident part region and coupled to the cover bottom, and the light guide part comprises a lower space of the horizontal part. It is characterized in that a plurality of light transmitting holes communicating with the light mixing space are formed.

In the present invention, a light mixing space is formed between the light guide plate and the optical sheet to perform light mixing, thereby providing a more uniform surface light source.

In addition, according to the present invention, since the light guide plate and the optical sheet are spaced apart from each other, it is possible to prevent damage to the light guide plate due to friction or deterioration of optical characteristics due to foreign substances intervening between the light guide plate and the optical sheet.

In addition, the present invention has an effect of improving light utilization efficiency by inducing light leaking to the side of the light guide plate back into the light mixing space while preventing the light characteristic from deteriorating by the light guide part of the middle frame forming the light mixing space.

1 is a combined cross-sectional view showing the main configuration of a display device according to the prior art;
2 is a combined cross-sectional view showing a main configuration of a display device according to the present invention;
3 is an enlarged cross-sectional view showing modified examples of a light guide part of a middle frame, which is a main part of FIG. 2;
4 is an enlarged cross-sectional view showing another modified example of the light guide part of the middle frame, which is a main part of FIG. 2.

The present invention and the technical problems achieved by the implementation of the present invention will be made clear by the preferred embodiments described below. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

It should be understood that the differences between the present embodiments described below are not mutually exclusive. That is, without departing from the spirit and scope of the present invention, specific shapes, structures, and characteristics described may be implemented in other embodiments in relation to one embodiment, and the location of individual components within each disclosed embodiment. Alternatively, it should be understood that the arrangement may be changed, and similar reference numerals in the drawings refer to the same or similar functions over various aspects, and the length, area, thickness, and the like may be exaggerated for convenience. In the description of the present embodiment, expressions such as inner, outer, upper, lower, etc. represent positions or directions relative to each other, and the technical meaning is not necessarily limited to the dictionary meaning.

2 is a combined cross-sectional view showing a main configuration of a display device according to the present invention, and FIGS. 3 and 4 are enlarged cross-sectional views showing various modified examples of the light guide part of the middle frame, which is the main part of FIG. .

First, referring to FIG. 2, the display device according to the present embodiment includes a cover bottom 100, a reflective sheet 200 disposed inside the cover bottom 100, a light guide plate 300, and a light guide plate 300 inside the cover bottom 100. A light source module 400 disposed on one side of the), a middle frame 500 that fixes the light guide plate 300 while being coupled to the cover bottom 100 along the edge of the cover bottom 100, and the middle frame 500 The optical sheet 600 to be stacked, the guide panel 700, the middle frame 500, and the guide panel, which are coupled to the middle frame 500 and the cover bottom 100 to fix the optical sheet 600 in the area of the light-in-carrying portion, are mounted And a case top 900 that is coupled to the middle frame 500 and fixes the liquid crystal panel 800 in the formed liquid crystal panel 800 and the light incident part region.

Specifically, the cover bottom 100 is a rear cover of a display device, stably fastening each component, reinforcing the strength of the display device and performing a heat dissipation function. The cover bottom 100 forms a rectangular plate shape, with an edge forming a vertical sidewall that is bent upward, and provides a space in which each component is accommodated. The cover bottom 100 is preferably made of a material exhibiting excellent rigidity and heat dissipation properties, and for example, may be formed by press molding aluminum or an aluminum alloy material.

The reflective sheet 200 is disposed between the bottom surface of the cover bottom 100 and the light guide plate 300 to reflect light leaking downward from the light guide plate 300 to the top to improve the luminance of light. The reflective sheet 200 may be formed of a sheet or film having excellent light reflectivity, and may be formed by coating a material mixed with a light reflecting material on the bottom surface of the cover bottom 100.

The light guide plate 300 (LGP: Light Guide Plate) converts the light emitted from the light source module 400 into a surface light source and guides the light to proceed to the liquid crystal panel 800. Light incident from one side of the light guide plate 300 repeats refraction and total reflection while proceeding inside the light guide plate 300, and in this process, some light is emitted to the upper surface to form a surface light source in the entire area of the light guide plate 300 . The light guide plate 300 is made of a transparent acrylic resin having a predetermined refractive index, for example, a resin such as polymethylmethacrylate (PMMA), poly styrene (PS), meta styrene (MS), or polycarbonate (PC).

The light source module 400 is a backlight light source of a display device and may be configured as an LED module in which an LED element 420 is mounted on a substrate 410.

The substrate 410 may be composed of a printed circuit board and, if necessary, may be composed of a flexible circuit board having excellent bending.

The LED device 420 may be a plurality of R, G, B light emitting diodes emitting red, green, and blue monochromatic light, or may be a light emitting diode emitting white light. When the LED device 420 is configured as a device emitting blue light, it may be combined with a separate quantum dot sheet to implement white light. In addition, the LED element 420 may be a top view type or a side view type element.

In this embodiment, a configuration in which the light source module 400 is disposed on one side of the light guide plate 300 is illustrated, but it may be disposed on both sides of the light guide plate 300 opposite to each other or all four sides, if necessary. . In the description of the present embodiment, a side portion of the light guide plate 300 on which the light source module 400 is disposed is referred to as a light incident portion, and the remaining side portion of the light guide plate 300 on which the light source module 400 is not disposed is referred to as a carry-in light portion.

The middle frame 500 fixes the reflective sheet 200, the light guide plate 300, and the light source module 400 accommodated in the cover bottom 100. In addition, the middle frame 500 forms an optical mixing space S in which light is mixed between the light guide plate 300 and the optical sheet 600 while seating the optical sheet 600 and the liquid crystal panel 800 on the upper surface. do. For this, the middle frame 500 has a rectangular frame shape with an open center, and is coupled along the edge of the cover bottom 100 while pressing the light guide plate 300. The middle frame 500 may be formed by injection molding a plastic material.

The middle frame 500 is a rectangular frame having a horizontal portion 510 and a light guide portion 520 extending downward at an inner end thereof is formed. This middle frame 500 provides a sheet seating surface 511 on which the optical sheet 600 is mounted on the upper surface of the horizontal portion 510, and the lower end of the light guide portion 520 presses the light guide plate 300 to be fixed. . Therefore, between the light guide plate 300 and the optical sheet 600, a light mixing space S corresponding to the height of the light guide part 520 is formed, and the light emitted from the light guide plate 300 is the light mixing space S After being mixed in, the luminance and uniformity are improved while passing through the optical sheet 600. In addition, the light guide unit 520 separates the light guide plate 300 and the optical sheet 600 to prevent damage to the light guide plate 300 due to friction, and between the light guide plate 300 and the optical sheet 600 during assembly. It minimizes deterioration of optical properties due to generated foreign matter.

In this embodiment, the light guide part 520 is configured to form an optical mixing space S having a height h of about 3 mm to 10 mm. When the optical mixing space S is formed to be less than 3 mm, dark portions due to foreign substances may be recognized, and when it exceeds 10 mm, there is a disadvantage in the thickness of the display device.

In addition, the light guide portion 520 is inclined at an inner end of the horizontal portion 510. The inclined light guide portion 520 can reduce the width of the horizontal portion 510, thereby minimizing the width of the bezel generated by the horizontal portion 510. In this case, the inclination angle α of the light guide part 520 is preferably formed between about 1° and 60°.

In addition, the middle frame 500 may further include a vertical portion 530 for fastening with the cover bottom 100 at an outer end of the horizontal portion 510 of the light incident portion region. Although not shown in the vertical portion 530, a fastening means having a hook structure for fastening to the cover bottom 100 may be formed. Accordingly, the middle frame 500 may be fastened to the cover bottom 100 in a hook structure in the light incident part, and fastened to the cover bottom 100 in a screw structure in the light entering part.

The optical sheet 600 is disposed on the light guide plate to improve brightness and uniformity of light emitted from the light guide plate 300. The optical sheet 600 may include a diffusion sheet and a prism sheet, and may further include various light control sheets for improving light characteristics.

The guide panel 700 provides a panel mounting surface 701 in the area of the light-in-carrying portion to mount the liquid crystal panel 800 and guide the liquid crystal panel 800 to be stably fixed. The guide panel 700 is composed of a'c'-shaped frame and is fastened to the cover bottom 100 along the carrying-in light portion area. The guide panel 700 may be formed by injection molding a resin made of a plastic material. Meanwhile, the panel seating surface 501 in the light incident area may be provided by the middle frame 500.

The liquid crystal panel 800 is a display device that implements an image using an arrangement of liquid crystal cells according to an electrical signal and light from a surface light source provided from a backlight unit. In the liquid crystal panel 800, the first and second substrates may be bonded to each other with a liquid crystal layer therebetween, and each substrate may be a thin film transistor substrate and a color filter substrate.

The case top 900 fixes the liquid crystal panel 800 while being coupled to the cover bottom 100 or the middle frame 500 in the light incident area. For this, the case top 900 may include a horizontal portion 810 that fixes the liquid crystal panel 800 and a vertical portion 820 that is coupled to the cover bottom 100 or the middle frame 500.

Meanwhile, in this embodiment, the light guide part 520 of the middle frame 500 may have various shapes.

As an example, referring to FIG. 3, as shown in (a), the light guide part 520 may have an inclined surface structure inclined downward at the inner end of the horizontal part 510. The light guide part 520 having an inclined surface structure can reduce the width of the horizontal part 510 to minimize the width of the bezel, and reflects the light mixed in the light mixing space S to the upper surface so that the light guide part 520 Minimize the dark part by

In addition, as shown in (b), the light guide part 520 may form a curved structure that is convex upward or inward while forming a downward slope at the inner end of the horizontal part 510. That is, the light guide part 520 has a curved shape that is convex inward with respect to the width direction of the middle frame 500. The curved light guide part 520 may control the uniformity of light in the light guide part 520 by adjusting the curvature according to the position.

In addition, as shown in (c), the light guide part 520 may form a multi-stage curved structure that is convex upward or inward while forming a downward slope at the inner end of the horizontal part 510. That is, the light guide unit 520 has a convex inner curved shape divided into multiple stages with respect to the width direction of the middle frame. The curved light guide unit 520 having a multi-stage structure may control the uniformity of light with respect to a specific height of the light guide unit 520 by adjusting the curvature according to the height direction position of the light mixing space S.

On the other hand, although not shown, the light guide unit 520 may form a curved shape convex inward along the length direction of the middle frame 500, or may have a configuration in which the curved surface is repeatedly formed in multiple stages.

And, referring to FIG. 4, as shown in (a), the light guide part 520 has a plurality of light-transmitting holes 521 formed therein. The light-transmitting hole 521 allows light leaking to the side of the light guide plate 300 from the area of the light-transmitting part, that is, light distributed under the light guide part 520 to move to the light mixing space S to be emitted. Accordingly, the light leaking from the light guide plate 300 in the area of the light guide plate 300 is not extinguished and is provided as an optical sheet, thereby improving light utilization efficiency.

In addition, as shown in (b), the light guide portion 520 has a light scattering pattern 522 formed on an inner surface (upper surface) or an outer surface (lower surface). The light scattering pattern 522 scatters or diffuses light distributed in the light mixing space S or the light distributed on the rear surface of the light guide unit 520 to be emitted to the optical sheet 600. The light scattering pattern 522 may be formed on one or both surfaces of an inner surface or an outer surface of the light guide unit 520, and may be formed as a dot-shaped fine pattern.

The present invention having the above-described configuration can provide a surface light source having more uniform light characteristics by forming an optical mixing space between the light guide plate and the optical sheet, and at the same time, damage to the light guide plate due to friction or between the light guide plate and the optical sheet It is possible to prevent the deterioration of optical properties due to foreign matters intervening in the. In addition, the present invention can improve light utilization efficiency by preventing deterioration of light characteristics by the light guide portion of the middle frame forming the light mixing space, and inducing light leaking to the side of the light guide plate back into the light mixing space. .

Although the exemplary embodiments of the present invention have been shown and described as described above, various modifications and other embodiments may be made by those skilled in the art. These modifications and other embodiments are all considered and included in the appended claims and will not depart from the true spirit and scope of the present invention.

100: cover bottom
200: reflective sheet
300: light guide plate
400: light source module
410: substrate 420: LED element
500: middle frame 501: panel seating surface
510: horizontal portion 511: seat seating surface
520: light guide part 521: light transmitting hole
522: light scattering pattern 530: vertical portion
600: optical sheet
700: guide panel
800: liquid crystal panel
900: case top

Claims (6)

While forming a square frame shape, the upper surface is a horizontal portion providing a sheet seating surface on which the optical sheet is seated;
A light guide part extending from an inner end of the horizontal part to form an optical mixing space between the light guide plate and the optical sheet while the end presses the light guide plate; And
Including; a vertical portion extending in a vertical direction from an outer end of the horizontal portion of the light incident portion region and coupled to the cover bottom,
The light guide part,
A middle frame for a display device, wherein a plurality of light-transmitting holes are formed to communicate a lower space of the horizontal part with the light mixing space. The method of claim 1, wherein the light guide part,
A middle frame for a display device, characterized in that extending from an inner end of the horizontal portion in a downward slope. The method of claim 2, wherein the light guide unit,
Middle frame for a display device, characterized in that forming a curved surface protruding convexly inward. The method of claim 3, wherein the light guide unit,
A middle frame for a display device, characterized in that it is divided into multiple stages and forms a multi-stage curved surface that is convex inwardly. A cover bottom forming a storage space therein;
A light guide plate disposed inside the cover bottom;
A light source module disposed on at least one side of the light guide plate within the cover bottom;
A middle frame having a rectangular frame shape and fastening to the cover bottom along an edge of the cover bottom to fix the light guide plate, and providing a sheet seating surface at a position spaced apart from the light guide plate on an upper surface;
An optical sheet having an edge seated on the sheet seating surface while forming a light mixing space between the light guide plates;
A guide panel that is fastened to the cover bottom along the edge of the cover bottom of the carrying-in light unit area and provides a panel seating surface on the top surface; And
And a liquid crystal panel mounted on the panel mounting surface and coupled to the guide panel. The method of claim 5, wherein the middle frame,
While forming a square frame shape, the top surface is a horizontal portion providing a sheet seating surface on which the optical sheet is seated;
A light guide part extending from an inner end of the horizontal part to form an optical mixing space between the light guide plate and the optical sheet while the end presses the light guide plate; And
Including; a vertical portion extending in a vertical direction from an outer end of the horizontal portion of the light incident portion region and coupled to the cover bottom,
The light guide part,
A display device, characterized in that a plurality of light-transmitting holes are formed to communicate a lower space of the horizontal part with the light mixing space.

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