KR20060027768A - Display device - Google Patents

Abstract

Disclosed is a display device in which display quality is improved by reducing heat transfer to a display panel. The display panel includes a liquid crystal between two glass substrates and receives light from the backlight assembly to display an image. The backlight assembly includes a lamp for providing light to the display panel. The storage container includes a plurality of sidewalls disposed along an edge of the display panel and a panel support part protruding from an inner side surface of the sidewalls and extending along the inner side surface. The lamp is disposed on the lower surface of the panel support, and the display panel is seated on the upper surface of the panel support opposite to the lower surface. The heat shield is formed on the upper surface of the panel support corresponding to the lamp to suppress the heat generated from the lamp from being transferred to the display panel. The first storage container receives the backlight assembly and the display panel in sequence, and is stored in the second storage container. Accordingly, transmission of heat generated from the lamp to the display panel may be reduced, thereby improving display characteristics.

Display, Liquid Crystal Degradation, Panel Support, Thermal Block, Recess

Description

Display {DISPLAY DEVICE}

1 is a perspective view of a display device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II ′ of FIG. 1.

3 is a cross-sectional view taken along the line II-II 'of FIG. 1.

4 is a plan view of a display device according to a first exemplary embodiment of the present invention as viewed from the front.

5 is a perspective view of a display device according to a second exemplary embodiment of the present invention.

FIG. 6 is a cross-sectional view taken along the line III-III ′ of FIG. 5.

FIG. 7 is a cross-sectional view taken along line IV-IV ′ of FIG. 5.

<Description of Symbols for Main Parts of Drawings>

100: display panel 200: backlight assembly

210: lamp unit 211: lamp

212: lamp reflector 220: light guide plate

300: first storage container 310: side wall

320: panel support 330: heat shield

400: second storage container

The present invention relates to a display device, and more particularly, to a liquid crystal display device in which a thermal conductivity from a lamp to a display panel is reduced to improve display quality of an image.

In general, the liquid crystal changes the transmittance of light according to the intensity of the electric field, and the liquid crystal display device (LCD) displays an image by using a liquid crystal (LC). In general, since liquid crystals are passive devices that cannot generate light by themselves, the liquid crystal display includes a backlight assembly to display an image in a dark place.

In general, the backlight assembly employed in the display device is classified into a direct downward type back light assembly and an edge type back light assembly according to the arrangement of the light sources.

The direct type backlight assembly is a structure mainly developed as the size of a liquid crystal display is increased, and one or more lamps are arranged in parallel under the display panel to provide light to the display panel. The direct type backlight assembly has an advantage of ensuring high luminance because multiple light sources can be used as compared to the edge type backlight assembly.

On the other hand, the edge type backlight assembly is a structure in which the lamp is disposed on the side of the light guide plate, mainly applied to the market value of a relatively small display size, such as laptop and desktop computer. Such an edge type backlight assembly is advantageous in that the display device can be thinned.

In order to obtain a desired image from a display device including the edge type backlight assembly, a display panel, a backlight assembly, and a storage container are generally required.

The display panel includes two glass substrates facing each other and a liquid crystal disposed between the two glass substrates.

The backlight assembly includes a lamp to provide light to the display panel. In general, a cold cathode fluorescent lamp (CCFL) is widely used as a lamp.

The display panel protrudes from an inner surface of the side wall of the storage container and is disposed on an upper surface of the panel support part formed along the side wall of the storage container. The lamp is placed on the bottom of the panel support.

While the lamp generates light, a large amount of heat is generated from the lamp. In particular, the electrode portion of the lamp generates more heat than the rest of the lamp portion. Heat generated from the electrode of the lamp is transferred to the display panel through the panel support of the storage container. Therefore, more heat is applied to the temperature of the display panel corresponding to the electrode portion of the lamp than the remaining area of the display panel.

Therefore, the liquid crystal of the display panel portion corresponding to the electrode portion of the lamp among the liquid crystals stored in the display panel increases in temperature due to heat generated from the electrode portion of the lamp, and as a result, the liquid crystal phase is changed and is generated from the display device. The display characteristics of the captured image are degraded.

In recent years, as the display area of the display device increases, the tube current applied to the lamp for high brightness increases. Accordingly, the amount of heat generated from the electrode of the lamp also increases. In addition, the thickness of the storage container decreases in accordance with the light weight and light thickness of the display device. Accordingly, the problem of blocking heat transfer from the lamp to the display panel is further highlighted.

Accordingly, the technical problem of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a display device having improved display characteristics by reducing thermal conductivity from an electrode portion of a lamp to a display panel.

According to an aspect of the present invention, a display device includes a display panel for displaying an image, a backlight assembly including a lamp for providing light to the display panel, and a plurality of display panels disposed along edges of the display panel. The side walls and the inner side of the side walls and protrude from the inner side, and the lamp is disposed on the lower surface and the support portion on which the display panel is seated on the upper surface opposite to the lower surface and the heat generated from the lamp are suppressed from being transmitted to the display panel. To this end, there is provided a display device including a first storage container including a heat shield formed on an upper surface of a support portion corresponding to a lamp, and a second storage container housing the first storage container.                     

According to such a display device, it is possible to reduce the transfer of heat generated from the lamp to the display panel, thereby improving display characteristics.

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

Display

Example 1

1 is a perspective view of a display device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II ′ of FIG. 1. 3 is a cross-sectional view taken along the line II-II 'of FIG. 1.

1 to 3, the display device 500 includes a display panel 100, a backlight assembly 200, a first storage container 300, and a second storage container 400.

The display panel 100 includes a thin film transistor substrate 110 on which a thin film transistor is formed, a color filter substrate 120 that opposes and couples the thin film transistor substrate, and a liquid crystal layer (not shown) interposed therebetween. The display panel 100 is accommodated in the first accommodating container 300 in which the backlight assembly 200 is accommodated and receives light from the backlight assembly 200 to display an image.

Liquid crystal refers to a material in between a liquid and a solid state, and is a material having liquid properties such as liquid and optical properties such as crystal. In other words, the intermediate state of the material is a liquid that is fluid in appearance and optically anisotropic in nature. In addition, the size of the liquid crystal molecules is approximately 10 × 10 (Å), the normal operating temperature range of the liquid crystal is approximately 25 ~ 35 (℃). That is, if the temperature of the liquid crystal is higher than the normal operating temperature, the property of the crystal having anisotropy is lost, and the light emitted from the backlight assembly 200 cannot be controlled and the display characteristics of the display device 500 are degraded.

2 and 3, the backlight assembly 200 includes a lamp unit 210, a light guide plate 220, and optical sheets (not shown).

 The lamp unit 210 includes a lamp 211 and a lamp reflector 212.

The lamp 211 includes a lamp body 211a and electrode portions 211b for discharging provided at both ends of the lamp body 211a. The lamps 211 are provided at both side surfaces of the light guide plate 220 facing each other to provide light to the light guide plate 220. Here, the lamp 211 may be provided only on one side of the light guide plate 220.

A large amount of heat is generated while the lamp 211 generates light. In particular, the temperature of the electrode portion 211b where the discharge occurs is higher than that of the other portions except for the electrode portion 211b of the lamp 211.

On the other hand, the lamp reflector 212 is made of a metal material with excellent reflectance, and houses the lamp 211. One side of the lamp reflector 212 is opened so that the received lamp 211 and the light guide plate 220 face each other.

Accordingly, a part of the light generated from the lamp 211 is directly incident to the light guide plate 220, and the other part is reflected by the lamp reflector 212 and is incident to the light guide plate 220.                     

The light guide plate 220 has a rectangular plate shape, receives light through a side surface adjacent to the lamp 211, emits light to an upper surface of the plate, and guides the light to the display panel 100.

The display device 500 according to the present exemplary embodiment may further include a reflecting plate or a reflecting sheet disposed on a lower surface of the light guide plate 220 and reflecting light leaked to the lower surface of the light guide plate 220 back to the light guide plate 220.

Optical sheets (not shown) are optical films for improving the front luminance characteristic of light disposed on the light guide plate 220 upper surface. The optical sheets make the luminance of the light emitted from the light guide plate 220 uniform and improve the front luminance by changing the path of the light.

1 to 3, the first accommodating container 300 includes a plurality of sidewalls 310 and a panel support 320.

The plurality of sidewalls 310 are disposed along the edge of the display panel 100 to support the display panel 100.

The panel support part 320 protrudes from the inner side surfaces of the sidewalls 310 and extends along the inner side surface. Accordingly, the panel support part 320 faces the lower surface 321 and the lower surface 321 where the lamp unit 210 is disposed, and the upper surface 322 and the lower surface 321 and the upper surface 322 on which the display panel 100 is seated. ) Is connected to the side.

The panel support part 320 and the sidewalls 310 are provided with a heat shield 330 for suppressing transfer of heat generated from the lamp 211 to the display panel 100.

Since more heat is generated and the temperature is higher in the electrode portion 211b of the lamp 211 than in other portions of the lamp 211, the heat shield 330 corresponds to the electrode portion 211b of the lamp 211. The upper surface 322 of the panel support 320 is preferably formed. Therefore, since the electrode part 211b of the lamp 211 is disposed near the corner where one sidewall and the other sidewall of the first storage container 300 meet, the heat shield 330 is also preferably formed near the corner.

Hereinafter, the shape of the heat shield 330 will be described in detail.

The heat blocking part 330 is a recess formed in the inner side surfaces 311 and 312 near the corner where one side wall and the other side wall of the first storage container 300 meet, and the upper surface 322 of the panel support part 320 corresponding thereto. (Recess) has a shape.

Therefore, the panel support part 320 formed on one side wall of the first storage container 300 extends along the inner side surface 311 of one side wall, and has a stepped downward from a predetermined position to an edge where one side wall and another side wall meet. do.

Likewise, the panel support part 320 formed on the other sidewall of the first storage container 300 extends along the inner side surface 312 of the other sidewall, and has a stepped downward from a predetermined position to an edge where the sidewall and the other sidewall meet. Thus, it is connected to the step formed in the panel support part 320 of one side wall.

In addition, one sidewall of the first storage container 300 is stepped from the inner side to the outer side near the corner.

Similarly, the other side wall of the first storage container 300 is stepped from the inner side to the outside near the corner, and is connected to the stepped formed on one side wall.

The second storage container 400 has a bottom portion and sidewalls to accommodate the first storage container 300. The second accommodating container 400 is preferably made of a metal material in order to protect the internal parts of the display device 500 and to facilitate heat dissipation to the outside. The second accommodating container 400 contacts the lamp reflector 212 and emits heat generated from the lamp 211 to the outside.

The display apparatus 500 according to the present exemplary embodiment covers the edge of the display panel 100 to prevent the display panel 100 from being separated from the first storage container 300 and to protect the display panel 100. The second storage container 400 may further include a third storage container 450 which is fastened.

4 is a plan view of a display device 500 according to a first embodiment of the present invention as viewed from the front.

2 to 4, the corner region where one edge and the other edge of the display panel 100 meet is positioned where the heat blocking part 330 is formed, and the inner side surface 311 of the panel support 320 and the side wall. 312), an air layer is formed therebetween.

Convection rarely occurs in the air layer. Here, the first storage container 300 is made of a plastic (heat-dissipating plastic) material having a thermal conductivity of approximately 0.2 (W / m · k). On the other hand, the thermal conductivity of the air layer is approximately 0.02 (W / m · k), and the air layer itself serves as a heat insulating layer.

In the unit of thermal conductivity, 'W' represents Watt, which is a unit of heat quantity, 'm' represents Meter, m, which is a unit of distance, and 'k' represents Kelvin, which is a unit of temperature. (K) is shown.                     

Therefore, the thermal conductivity from the electrode portion 211b of the lamp 211 to the display panel 100 is reduced, and the display areas A and B of the display panel 100 corresponding to the electrode portion 211b of the lamp 211 are reduced. In C, D), phase shift of the liquid crystal due to the temperature rise of the liquid crystal is blocked, thereby improving display quality.

Example 2

5 is a partial perspective view of a storage container included in the display device according to the second exemplary embodiment of the present invention. FIG. 6 is a cross-sectional view taken along the line III-III ′ of FIG. 5. FIG. 7 is a cross-sectional view taken along line IV-IV ′ of FIG. 5.

The display device 1000 according to the present exemplary embodiment is the display device illustrated in FIG. 1 except for the shape of the heat shield 830 formed on the side wall 810 and the panel support 820 of the first storage container 800. Since it is the same as 500, the corresponding reference numeral is given and overlapping description is omitted.

5 to 7, the first receiving container 800 includes a plurality of sidewalls 810 and a panel support 820.

The plurality of sidewalls 810 are disposed along the edge of the display panel 600 to support the display panel 600.

The panel support 820 is formed to protrude from the inner surfaces 811 and 812 of the side walls 810 and extend along the inner surfaces 811 and 812. Accordingly, the panel support 820 faces the lower surface 821 and the lower surface 821 where the lamp unit 710 is disposed, and the upper surface 822 and the lower surface 821 and the upper surface 822 on which the display panel 600 is seated. ) Is connected to the side.

The panel support 820 and the sidewalls 810 include a heat shield 830 for suppressing transfer of heat generated from the lamp 711 to the display panel 600.

The shape of the heat shield 830 will be described in detail as follows.

The heat shield 830 may include grooves formed on inner surfaces 811 and 812 of corner portions where one side wall and the other side wall of the first storage container 800 meet, and an upper surface 822 of the panel support 820 corresponding thereto. Groove) shape.

Accordingly, the panel support part 820 formed on one side wall of the first storage container 800 extends along the inner side surface 811 of the one side wall, and the one side wall from the predetermined position on the upper surface 822 of the panel support part 820. An elongated groove having a constant depth is formed up to an edge where the sidewalls meet the other sidewalls.

Likewise, the panel support part 820 formed on the other side wall of the first storage container 800 extends along the inner side surface 812 of the other side wall, and the upper surface 822 of the panel support part 820 has one side wall from a predetermined position. An elongated groove having a constant depth is formed to an edge where the other side wall meets, and meets a groove formed in the panel support 820 of one side wall near the edge.

 In addition, a groove having a constant depth is formed in the inner side surface 811 of one side wall of the first storage container 800 from a predetermined position to the vicinity of the corner.

Similarly, a groove having a constant depth from a predetermined position to the vicinity of the corner is formed on the inner side surface of the other side wall of the first storage container 800.                     

 The display panel is not in contact with the inner surfaces 811 and 812 of the sidewalls and the upper surface 822 of the panel supporter 820 in the heat shield 830, thereby forming an air layer therebetween.

Convection rarely occurs in the air layer. The thermal conductivity of the heat-dissipating plastic, which is the material of the first storage container 800, is about 0.2 (W / m · k), while the thermal conductivity of the air layer is about 0.02 (W / m · k), and the air layer itself serves as a heat insulating layer. do.

Therefore, the thermal conductivity from the electrode portion 711b of the lamp 711 to the display panel 600 is reduced, and the temperature of the liquid crystal in the display area of the display panel 600 corresponding to the electrode portion 711b of the lamp 711. The phase shift of the liquid crystal due to the rise is blocked to improve the display quality.

Although described above with reference to the embodiments, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below. I can understand.

As described above, according to the present invention, the heat shield formed in the panel support of the first storage container is an air layer that blocks direct contact between the display panel and the panel support, and reduces the thermal conductivity from the electrode portion of the lamp to the display panel. . Accordingly, in the display area of the display panel corresponding to the electrode part of the lamp, phase shift of the liquid crystal due to temperature rise of the liquid crystal is blocked, thereby improving display quality.

Claims (5)

A display panel for displaying an image; A backlight assembly including a lamp for providing light to the display panel; A plurality of sidewalls disposed along an edge of the display panel, protruding from the inner side surfaces of the sidewalls and extending along the inner side surface, wherein the lamp is disposed on a lower surface and the display panel is seated on an upper surface opposite to the lower surface; A first accommodating container including a support part and a heat shield formed on the upper surface of the support part corresponding to the lamp to suppress the heat generated from the lamp from being transferred to the display panel; And And a second storage container accommodating the first storage container. The display device of claim 1, wherein the lamp includes an electrode for discharging, and the heat shield is formed on an upper surface of the support part corresponding to the electrode and an inner surface of the sidewalls. The display device of claim 1, wherein the heat shield has a recess shape. The display device of claim 1, wherein the heat shield is grooved. The display device of claim 1, further comprising a light guide plate configured to receive the light from the backlight assembly and guide the light toward the display panel.

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