KR101629828B1 - Display apparatus - Google Patents

Abstract

In one embodiment of the present invention, a front cover, a display module for displaying an image, a back plate for covering the display module in combination with the front cover, a driving unit attached to a rear surface of the back plate, And a case coupled to the back plate while surrounding the case.

Liquid crystal, display, light emitting diode, side, thickness

Description

DISPLAY APPARATUS

The present invention relates to an apparatus for displaying an image.

(PDP), an electro luminescent display (ELD), a vacuum fluorescent display (VFD), a liquid crystal display (PDP), and the like have been recently developed in response to the demand for display devices. Fluorescent Display) and other types of display devices are in full swing.

Of these, a liquid crystal display (LCD) is one of the most widely used flat panel displays. The liquid crystal display is composed of a front panel and a rear panel on which electrodes are formed, and a liquid crystal layer interposed therebetween And a voltage is applied to the electrodes to rearrange the liquid crystal molecules in the liquid crystal layer to adjust the amount of light transmitted.

This liquid crystal display is advantageous in that it can be made light and thin because it consumes very little power compared to other displays, and is currently the most widely used in the market.

The present invention has been made in view of such background, and it is intended to provide a display device with reduced thickness.

In order to solve such a problem, in an embodiment of the present invention, a front cover, a display module for displaying an image, a back plate for covering the display module in combination with the front cover, A driving unit for operating the module, and a case coupled to the back plate while surrounding the driving unit.

Here, the display module may be in contact with the back plate, and in this case, an adhesive layer may be provided to contact the display module and the back plate.

The driving unit and the display module may be connected to each other through wirings connected through the holes formed in the back plate.

The display module may be formed of a liquid crystal display device. In this case, a driving unit for operating the liquid crystal panel and the backlight unit is located on the back surface of the back plate.

The backlight unit may include a first layer, a light emitting diode formed on the first layer, the light emitting surface facing the side surface, and a second layer formed on the first layer while embedding the light emitting diode have.

According to an embodiment of the present invention, the thickness of the apparatus can be reduced to a minimum by constituting the back cover constituting the former backlight unit and the back cover forming the outer tube by one back plate.

And, the display module is configured to directly contact the back plate, so that the heat generated in the display module can be directly cooled through the back plate.

In addition, the thickness of the apparatus can be drastically reduced by locating the driving unit, which was previously located inside the cover, outside the back plate.

Further, by configuring the backlight unit using the light emitting diode whose side faces the light emitting surface, the thickness of the device can be reduced by reducing the thickness of the backlight unit and bringing the backlight unit into close contact with the panel.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

FIG. 1 is a view showing a schematic configuration of a display device, and FIG. 2 is an assembled cross-sectional view taken along line A-A of FIG.

1 and 2, the display device 10 includes a front cover 15, a display module 11, a back plate 13, a driving portion 17, and a case 19. As shown in Fig.

The front cover 15 covers the sides of the display module 11 to protect the display module 11 from external impact. The front cover 15 forms a window 15a so that an image displayed by the display module 11 is displayed.

Further, the front cover 15 can be made of a flat plate without the window 15a. In this case, the front cover 15 is made of a transparent material that transmits light, for example, an injection-molded plastic. Accordingly, the front cover 15 is positioned in front of the display module 11 to protect the display module 11 from an external impact, and allows the display module 20 to see the image displayed by the light. As such, if the front cover 15 is formed as a flat plate, the frame can be removed from the front cover 15. [

The display module 11 is configured to display an image. The display module 11 may include a panel 101 and a backlight unit 103. In one example, the panel 101 is composed of an LCD (Liquid Crystal Display).

As illustrated in FIG. 3, the panel 101 includes an upper substrate 110 and a lower substrate 120 bonded together to maintain a uniform cell gap while facing each other, and between the two substrates 110 and 120 And a liquid crystal layer 130 formed thereon. Here, the upper substrate 110 includes sub-pixels such as a red cell, a green cell, and a blue cell, and displays colors according to light emitted from the liquid crystal. The lower substrate 120 includes a switching element such as a TFT (Thin Film Transistor) to control the molecular arrangement of the liquid crystal layer for each pixel. Polarizing plates 140 and 150 may be disposed on the top and bottom of the panel 101, respectively. The polarizing plates polarize light incident on the panel 101.

Then, the backlight unit 103 is positioned below the panel 101 and supplies light to the panel 100. The backlight unit 103 may be variously configured according to the light emitting element. In one example, a cold cathode fluorescent lamp (CCFL) or a light emitting diode may be used as the light emitting element.

Such a backlight unit 103 is installed as an optical system component that allows light to be transmitted from the light source to the panel 101, such as a light guide plate and a diffusion plate.

When the backlight unit 103 uses a light emitting diode as a light source, the backlight unit 103 can be fixed tightly to the panel 101 via an adhesive layer (not shown). In this case, by reducing the space between the backlight unit 103 and the panel 101, the thickness of the entire device can be reduced. The configuration of the backlight unit 103 will be described in detail below.

The back plate 13 is positioned to face the front cover 15 with the display module 11 therebetween. The back plate 13 and the front cover 15 may be coupled to each other through a fixing member (not shown), or may be screwed to the display module 11 described above. The front cover 17 and the back plate 17 are coupled to each other to protect the display module 11 and to provide an appearance of the product.

Meanwhile, the display module 11 can be fixed while being in contact with the back plate 13 via the adhesive layer 111. Since the display module 11 is in surface contact with the back plate 13, the heat generated in the panel 101 of the display module 11 and the backlight unit 103 can be easily transmitted to the outside through the back plate 13 Can be released. Therefore, the back plate 13 is formed of a material such as aluminum or steel having good rigidity so as to support the display module 11 while having good thermal conductivity.

A driving unit 17 for operating the display module 11 is disposed below the back plate 13 on the back surface of the back plate 13. [ The driving unit 17 includes a first driving unit 17a for operating the panel 101 and a second driving unit 17b for blinking the backlight unit 103. [

The first driving part 17a is electrically connected to a switching element provided on the lower substrate 120 of the panel 101 through a flexible wiring 500 such as a flexible printed circuit, And displays an image by controlling the operation of the device and adjusting the amount of light transmitted through the panel 101.

Likewise, the second driver 17b is also electrically connected to the backlight unit 103 through the wiring line 500.

The connection of the driving unit 17 and the display module 11 will be described with reference to FIGS. 4 and 5. FIG. FIG. 4 is a partial cross-sectional view showing the connection relationship, and FIG. 5 is a perspective view of the device shown in FIG. 1, showing an internal view in which the wiring is connected to the driving part.

In Figs. 4 and 5, one side of the wiring 500 is electrically connected to the switching element provided on the lower substrate 120 of the panel 101. Fig. And the other extends toward the back plate 13 from the side of the display module 11.

On the other hand, the back plate 13 is provided with a hole 13a. The wiring 500 extends out of the device 10 through the hole 13a.

The first driving portion 17a is screwed to the back surface of the back plate 13 adjacent to the hole 13a. The wire 500 having passed through the hole 13a is connected to the connector c provided at the first driving portion 17a at that position so that the first driving portion 17a is connected to the lower substrate 120 of the panel 101 .

1, the driving unit 17 is fixed to the back surface of the back plate 13 in a state where the driving unit 17 is connected to the display module 11 through the wiring 500 as described above. The driving portion 17 can be fixed to the back plate 13 with screws.

Then, the case 19 is fixed to the back plate 13 while covering the driving portion 17. The case 19 protects the driving unit 17 from an external impact. On the other hand, the case 19 can be made of aluminum or steel, like the back plate 13, and effectively emits heat transmitted from the display module 11 together with the back plate 13. [

Hereinafter, with reference to FIG. 6, the backlight unit 103 in the case where the light source is a light emitting diode will be described. 6 is a cross-sectional view schematically showing the configuration of a backlight unit in which the light source is an LED.

In FIG. 6, the backlight unit 103 includes a first layer 210, a light source 220, and a second layer 230.

A plurality of light sources 220 are formed on the first layer 210 and a second layer 230 is formed on the first layer 210 to cover the light sources 220.

The first layer 210 may be a substrate on which the light sources 220 are mounted, and an electrode pattern (not shown) connecting the light sources 220 is formed on the first layer 210. The substrate 220 may be a metal PCB formed of a metal such as aluminum that does not conduct electricity.

The light source 220 may be one of a light emitting diode (LED) chip or a light emitting diode package having at least one light emitting diode chip. It is preferable that the light emitting die 220 is a side view type light emitting diode in which the light emitting surface faces the side.

Also, the light source 220 emits at least one of the three primary colors of red, blue, and green, or white.

A second layer 230 is formed on the first layer 210 so as to embed the light sources 220. The second layer 230 transmits light emitted from the light source 220 So that the light emitted from the light source 220 is uniformly provided to the panel 101.

A reflection layer 240 may be further formed between the first layer 210 and the second layer 230, that is, on the upper surface of the first layer 210 to reflect light emitted from the light source 220. The reflective layer 240 reflects the light totally reflected from the interface of the second layer 230 so that the light emitted from the light source 220 is spread in a widened state.

The reflection layer 240 may be formed by dispersing a white pigment such as titanium oxide in a synthetic resin sheet, having a metal vapor deposition film on the surface thereof, dispersing bubbles in a synthetic resin sheet to scatter light, and the like And silver may be coated on the surface to increase the reflectance. The reflective layer 240 may also be formed as a coating on the first layer 210.

The second layer 230 may be made of a light-transmissive material, for example, silicone or an acrylic resin. However, the second layer 230 is not limited to such a bite.

The second layer 230 may be formed of a resin having a refractive index of about 1.4 to 1.6 so that light emitted from the light source 220 is diffused and the backlight unit 103 has a uniform brightness.

The second layer 230 may be formed by applying a resin in a liquid state or a gel state to the upper side of the plurality of light sources 220 and the first layer 210 and curing the resin, The first layer 210 may be adhered to the upper side.

Since the light emitted from the light source diffuses more widely as the thickness a of the second layer 230 increases, light of a uniform brightness from the backlight unit 103 can be provided to the panel 101 . On the other hand, as the thickness of the second layer 230 increases, the amount of light absorbed in the second layer 230 increases, so that the brightness of the light can be reduced.

Therefore, the thickness a of the second layer 230 is 0.1 to 4.5 (mm) in order to obtain light of a uniform brightness without reducing the brightness of the light provided from the backlight unit 103 to the panel 101 desirable.

An optical sheet 250 may be further disposed on the second layer 230 like this. The optical sheet 250 may include a prism sheet 251 and a diffusion sheet 252.

In this case, since the prism sheet 251 and the diffusion sheet 252 are in close contact with each other without being separated from each other, the thickness of the backlight unit 103 can be minimized.

 According to the configuration of the backlight unit 103 as described above, the light emitted to the side surface of the light source 220 is provided to the upper diffusion sheet 252 which is reflected by the reflection plate 240. Thus, the diffusion sheet 252 diffuses the incident light to prevent the light from being partially concentrated, thereby uniformizing the brightness of the light. Further, the prism sheet 251 condenses the light emitted from the diffusing sheet and causes the light to be incident on the panel 101 vertically.

Such a backlight unit 103 can be fixed to the lower surface of the panel 101 via an adhesive layer ad.

7 is a view for explaining a mode in which the side view type light emitting diodes 220 are arranged.

In Fig. 7, the above-described light emitting diodes 220 emit light in the lateral direction. Thus, in order for the backlight unit 103 to exhibit uniformly uniform brightness, the light emitting diodes 220 are arranged to form two or more rows. Here, the light emitting diodes 220 disposed in the same row emit light in one direction.

For example, the light sources adjacent to the first light source 220 in the left and right direction also emit light in the same direction as the first light source 220, that is, in the negative X-axis direction in the figure, The light sources emit light in a direction opposite to that of the first light source 220, that is, a positive X-axis direction.

As described above, since the light emitting diodes 220 emit light in opposite directions along a row, it is possible to reduce the phenomenon that the brightness of light is concentrated or weakened in a specific region of the backlight unit 103.

The backlight unit 103 formed in this manner can be driven by the entire driving method or a partial driving method such as local dimming, impulse, or the like.

That is, the backlight unit 103 can be divided into a plurality of divided driving regions, and by driving the luminance of the divided driving region in accordance with the luminance of the video signal, the display quality of the image such as the contrast ratio and the sharpness can be improved.

Accordingly, a plurality of backlight units 103 may be combined. For example, a plurality of optical assemblies 10 shown in Fig. 8 may be combined to constitute one backlight unit 103. Fig. In this case, only a portion of the optical assemblies 10 may be independently driven to emit light, so that the light sources 220 included in each of the optical assemblies 10 can be independently controlled.

On the other hand, the area of the panel 101 corresponding to one optical assembly 10 can be divided into two or more blocks, and the panel 101 and the backlight unit 103 can be dividedly driven in a block unit.

As described above, when the backlight unit 103 is composed of a plurality of optical assemblies 10, the manufacturing process of the backlight unit 103 can be simplified, and the loss that may occur in the manufacturing process can be minimized. Further, the backlight unit 103 can be applied to backlight units of various sizes by mass-producing the optical assembly 10 in a standardized standard.

In addition, when a failure occurs in the light emitting diode provided in the backlight unit 103, only the optical assembly 10 is selectively replaced without replacing the entire backlight unit 103, It is possible to reduce the replacement cost of the parts.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

1 is an exploded perspective view showing a schematic configuration of a display device.

2 is an assembled cross-sectional view taken along the line A-A in Fig.

3 is a schematic cross-sectional view showing the configuration of the display module.

4 is a schematic cross-sectional view showing a state in which the display module and the driving unit are connected through wiring.

Fig. 5 is a perspective view of the apparatus shown in Fig. 1, partially showing an internal view in which the wiring is connected to the driving unit.

6 is a cross-sectional view schematically showing a configuration of a backlight unit in which a light source is a light emitting diode.

7 is a view for explaining a mode in which a side view type light emitting diode is arranged.

8 is a view showing that a backlight unit is composed of a plurality of optical assemblies.

Claims (7)

Front cover; A display module for displaying an image; A back plate coupled to the front cover to surround the display module; A driving unit attached to a back surface of the back plate and operating the display module; A case coupled to the back plate while surrounding the driving unit; A hole located on one side of the driving unit and formed in the back plate; And And a wiring connecting the display module and the driving unit through the hole. The method according to claim 1, Wherein the display module is in contact with the back plate. 3. The method of claim 2, And an adhesive layer contacting the display module and the back plate. delete The method according to claim 1, The display module includes a panel for displaying an image, And a backlight unit for supplying light to the panel. 6. The method of claim 5, The driving unit includes: A first driver for operating the display module, And a second driver for blinking the backlight unit. 6. The method of claim 5, The backlight unit includes: A first layer, A light emitting diode formed on the first layer and having a light emitting surface facing a side surface, And a second layer formed on the first layer while embedding the light emitting diode.

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