Display apparatus with backlight and reflective sheet holder with concave parts

A display apparatus that includes a display panel, a plurality of light sources disposed in upper and lower side directions and in left and right side directions at a rear side of the display panel while spaced apart from one another, a reflective sheet to reflect light generated from the plurality of light sources to the display panel, and a middle holder to support a periphery of the reflective sheet, wherein the middle holder includes a plurality of concave parts each provided at a position corresponding to each of the light sources that is positioned at an outer side among the plurality of the light sources. Most of the light incident from the light sources positioned at the outer side toward the middle holder is reflected while diffused by an inner surface of the concave part, and thus occurrence of a light portion and a dark portion at a periphery of a display panel can be reduced.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of the Korean Patent Application No. 2015-0058788, filed on Apr. 27, 2015, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.

BACKGROUND

Apparatuses and methods consistent with exemplary embodiments relate to a display apparatus having a plurality of light sources provided at a rear side of a display panel, and a reflective sheet to reflect light generated from the plurality of light sources to the display panel.

Apparatuses and methods consistent with exemplary embodiments also relate to a display apparatus including a plurality of light sources provided behind a display panel and a reflective sheet to reflect light generated from the plurality of light sources to the display panel.

2. Description of the Related Art

In general, a display apparatus includes a display panel, on which images are displayed, and a backlight to supply light to the display panel.

One type of such a display apparatus is a direct-type display apparatus, which is provided with a plurality of light sources disposed in upper and lower side directions and left and right side directions at a rear of a display panel, and has a reflective sheet to reflect light generated from the plurality light sources to the display panel.

With such a display apparatus, light generated from the light sources that are positioned at outer edges of the display apparatus from among the plurality of light sources is reflected toward a front of the display panel by a sheet side portion inclinedly provided at a peripheral side of the reflective sheet. In this case, a large amount of light reaches a portion adjacent to the light source and then is reflected toward the front, and a small amount of light reaches a portion distant from the light source and then is reflected toward the front.

Therefore, at a periphery of the display panel, a light portion and a dark potion are generated. The light portion is illuminated by relatively more amount of light then the dark portion.

SUMMARY

Aspects of one or more exemplary embodiments may overcome the above disadvantages and other disadvantages not described above. Also, the exemplary embodiments are not required to overcome the disadvantages described above, and an exemplary embodiment may not overcome any of the problems described above.

According to an aspect of an exemplary embodiment, there is provided a display apparatus including a display panel, a backlight disposed at a rear side of the display panel, a reflective sheet configured to reflect light generated from the backlight toward the display panel, a bottom chassis configured to accommodate the backlight, and a middle holder configured to support a peripheral side of the reflective sheet while coupled to the bottom chassis. The backlight includes a substrate and a plurality of light-emitting diodes disposed on the substrate. The middle holder includes a plurality of concave parts each concavely provided at a position corresponding to each light-emitting diode among the plurality of light-emitting diodes that are positioned at outer portions of the substrate.

In some exemplary embodiments, the display apparatus may further include wherein the reflective sheet include a sheet rear portion forming a rear surface of the reflective sheet, and a sheet side portion extending inclinedly outwardly toward a front of the display apparatus from an outer side end of the sheet rear portion, the middle holder comprises a bottom coupling part coupled to the bottom chassis, and a sheet holder part configured to support the reflective sheet while extending inclinedly toward an inner side of a rear from the bottom coupling part, wherein the plurality of concave parts are provided in the sheet holder part.

In some exemplary embodiments, each of the plurality of concave parts is formed in a shape of an arc.

Some exemplary embodiments of the display apparatus include wherein the plurality of concave parts is formed in a shape of an arc having a curvature centered with respect to each corresponding light-emitting diode.

In exemplary embodiments of the display apparatus, the middle holder is white.

Some exemplary embodiments of the display apparatus include wherein the bottom chassis includes a bottom rear part having a shape of a rectangular panel, four bottom inclination parts extending inclinedly outwardly towards a front of the display apparatus from four outer side ends of the bottom rear part, and a holder coupling part to which the middle holder is coupled while provided at a front side of the four bottom inclination parts, and the middle holder comprises four middle holders, each formed in a shape of a bar and coupled to another of the four holder coupling parts.

One or more exemplary embodiments include a display apparatus having a display panel, a pattern of a plurality of light sources configured to irradiate light around a periphery of a rear side of the display panel, a reflective sheet configured to reflect light generated from the plurality of light sources to the display panel, and a middle holder configured to support the reflective sheet. The middle holder comprises a plurality of concave parts, each of the plurality of concave parts provided at a position corresponding to light sources among the plurality of light sources that are positioned at outer portions of the pattern.

In some exemplary embodiments, the reflective sheet includes a sheet rear portion forming a rear surface of the reflective sheet, and a sheet side portion extending inclinedly outwardly towards a front of the display apparatus from the sheet rear portion, and the middle holder is further configured to support the sheet side portion.

Some exemplary embodiments of the display apparatus include wherein each of the plurality of concave parts is formed in a shape of an arc having a curvature centered with respect to each corresponding light source.

In some exemplary embodiments, the plurality of light sources comprise a light-emitting diode.

One or more exemplary embodiments include a displaying apparatus having a display panel, a backlight disposed to irradiate light towards a rear side of the display panel, the backlight comprising a plurality of light sources, a reflective sheet configured to reflect light emitted from the backlight towards the display panel, a bottom chassis configured to mount the backlight, and a middle holder configured to engage with the bottom chassis, the middle holder comprising a plurality of concave parts outside of outer portions of the plurality of light sources, each of the plurality of concave parts being respectively aligned with a corresponding light source of the plurality of light sources.

In some exemplary embodiments, the plurality of light sources are arranged in rows and columns.

Some exemplary embodiments of the display apparatus include wherein the middle holder and the bottom chassis further are configured to hold outer portions of the reflective sheet at an inclined angle relative to a central portion of the reflective sheet.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

The following description refers to one or more exemplary embodiments and methods of accomplishing the same, examples of which are illustrated in the accompanying drawings to assist in a comprehensive understanding, wherein like reference numerals refer to like elements throughout. The detailed description includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

As illustrated onFIG. 1, a display apparatus1according to an exemplary embodiment of the present disclosure includes a display unit10on which images are displayed, and a stand20configured to position or elevate the display unit10in a standing position on a horizontal surface.

As illustrated onFIG. 2andFIG. 3, the display unit10includes a display panel11forming a screen, a backlight12to supply light to the display panel11disposed at a rear of the display panel11and spaced apart. A middle mold13supports the display panel11. A top chassis14is provided such that the display panel11may maintain a state of being supported at a front side of the middle mold13, and a bottom chassis15is provided such that the backlight12is disposed at a rear side of the middle mold13while the bottom chassis15is coupled to the middle mold13.

The display panel11is structured by use of a liquid crystal panel being formed when liquid crystal is sealed in between two glass panels each provided with an electrode.

The backlight12includes substrates121, and a plurality of light-emitting diodes122each installed on the substrates121and each provided to function as a light source. The substrates121in the present embodiment include a plurality of substrates121formed in the shape of a rectangular bar and vertically disposed while being spaced apart from one another, and the light-emitting diodes122are installed in a plurality of units thereof at the each of the plurality of substrates121while being spaced apart from one another. Therefore, the light-emitting diodes122are provided in a state in which the light-emitting diodes122are patterned upwardly and downwardly as well as towards left and right sides at the rear side of the display panel11while being spaced apart from one another. In exemplary embodiments, the light-emitting diodes are arranged in a pattern of rows and columns. The light-emitting diodes may be arranged in a rectangular pattern.

The middle mold13includes a panel settling part131provided at a front side of the middle mold13and on which the display panel11is settled and supported, and sheet supporting parts132protruded toward a rear side of the display apparatus from the panel settling part131as to support outer sides of optical sheets17A,17B, and17C, which are described later.

The top chassis14includes a top front surface part141to support a periphery of the display panel11, and a top side part142coupled to a middle holder19, which is to be described later. In the present embodiment, the top chassis14is provided to function as a case forming an exterior appearance of the display part10.

The bottom chassis15includes a bottom rear part151to support a rear surface of the backlight12, the bottom rear part151being formed substantially in the shape of a rectangular panel. Four bottom side parts152extend inclinedly and outwardly from the four outer side edges of the bottom rear part151toward the front of the display apparatus. A holder coupling part153is provided at a front side of each of the four bottom side units152, the holder coupling part153being configured to couple to the middle holder19, which is described later. A diffusion member16, configured to diffuse the light supplied from the backlight12, and the optical sheets17A,17B, and17C, configured to improve optical characteristics of the light delivered by the diffusion member16, are included between the display panel11and the backlight12. The outer edges of the diffusion member16and the optical sheets17A,17B, and17C in the present embodiment are supported when positioned in between the middle mold13and the middle holder19.

The diffusion member16is formed in the shape of a rectangular panel to correspond to the display panel11. The diffusion member16is formed with white, semi-transparent material and is configured such that the light supplied from the backlight12may be diffusively penetrated.

The optical sheets17A,17B, and17C include a diffusing sheet17A to diffuse the light delivered by the diffusion member16, a prism sheet17B to collect the light delivered from the diffusing sheet17A through refraction, and a protective sheet17C to protect the prism sheet17B.

An inside of the bottom chassis15is provided with a reflective sheet18disposed thereto such that the light generated from the light-emitting diodes122may be reflected to the display panel11at a front, and the bottom chassis15is provided with the middle holder19coupled thereto as the middle holder19is provided to maintain the reflective sheet18in a state of being installed at an inside of the bottom chassis15.

The reflective sheet18includes a sheet rear part181to form a rear side of the reflective sheet18while formed in the shape of a rectangle, and four sheet side parts182extending inclinedly outwardly from the four outer side edges of the sheet rear part181toward a front of the display apparatus. The sheet rear part181is provided with a penetration hole183at a position corresponding to the each of the light-emitting diodes122so that the light-emitting diodes122may penetrate the reflective sheet18and protrude towards a front side.

The middle holder19is white, so to reflect light while diffusing the light. Four middle holders19are each coupled to each of the four holder coupling parts153of the bottom chassis15while formed substantially in the shape of a rectangular bar when seen from a front side. Each middle holder19includes a bottom coupling part191coupled to the holder coupling part153, and a sheet holder part192to support a front side end portion of the sheet side part182while extending inclinedly toward the rear of the display panel. In addition, the bottom coupling part191of the middle holder is provided with a first coupling hook193protruded toward a rear side, and a second coupling hook194protruding towards a side of the display apparatus. The holder coupling part153is provided with a coupling hole154at which the first coupling hook193is penetratively hooked, and the top chassis14includes a hooking bump143with which the second coupling hook194is hooked while protruded from an inner surface of the top side part142.

In exemplary embodiments, the middle holder19and the middle mold13support a periphery of the diffusion member16.

Therefore, after the reflective sheet18is disposed inside of the display apparatus between the display panel11and the bottom chassis15, the middle holder19is coupled to the holder coupling part153by the first coupling hook193and the coupling hole154. The front side end portion of the sheet side part182is inserted between the bottom side part152and the sheet holder part192, and thus the installation of the reflective sheet18is completed.

In addition, as illustrated onFIG. 4, the middle holders19include concave parts195each concavely provided at a position corresponding to each of the light-emitting diodes122that are positioned at outer positions of the pattern of light-emitting diodes122. As illustrated onFIG. 5, the each concave part195is formed in the shape of an arc having the corresponding light-emitting diode122aligned as a center of the curvature R.

With the structure above, most of the light radiated toward the middle holder19from the light-emitting diode122corresponding to the each concave part195is incident at an inner surface of the concave part195at a substantially identical distance. As the amount of the light is provided to be inversely proportional to the square of the distance, a uniform amount of light is incident at the inner surface of the concave part195and then is reflected after being diffused. Therefore, the occurrence of the light portion and the dark portion at a periphery of the display panel11is reduced by use of the concave parts195.

The concave part195in an exemplary embodiment is provided such that uniform light is incident at the inner surface of the concave part195while formed in the shape of an arc, but is not limited hereto, and the concave part may be formed in a variety of arc shapes, such as the shape of an elliptical arc, or the concave part may be formed in the shape of a polygon.

The four middle holders19formed in the shape of a rectangular bar are provided in the present embodiment, but are not limited hereto, and the middle holder may be formed in the shape of a rectangular frame.

In addition, the middle holder19in the present embodiment includes the bottom coupling part191and the sheet holder part192, and the concave part195is provided at the sheet holder part192, but are not limited hereto, and in a case that the middle holder is provided with a structure corresponding to only the bottom coupling part191, the concave part may be provided in the bottom coupling part191.

In addition, the light-emitting diode122is used as a light source to generate light in the exemplary embodiment, but is not limited hereto, and other various light sources, such as a cold cathode fluorescent (CCFL), quantum dot, or light-emitting transistor , may be used.

As described above, a concave part is provided at a middle holder19to correspond to each of light-emitting diodes that is at an outer side among the light-emitting diodes, and thus most of the light incident from the light-emitting diodes at the outer side toward the middle holder is reflected and diffused by an inner surface of the concave part, and the occurrence of a light portion and a dark portion at a periphery of a display panel can be reduced.