KR20020083719A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: A liquid crystal display device is provided to emit heat generated in a heat assembly in a minimum time by the heat emission and the heat conductance, thereby preventing the deterioration of the electrical-optical properties of liquid crystal. CONSTITUTION: A liquid crystal display device includes an LCD assembly(200) for controlling liquid crystal to display images, a backlight assembly(345) having a lamp assembly(330) composed of a lamp(334) and a lamp cover(332) for supplying light to the LCD assembly, and a light uniformity improving unit(342) coupled with the lamp assembly for improving the optical uniformity of the light supplied from the lamp assembly, and a heatproof container(350) formed with heatproof element for fixing the backlight assembly and emitting the heat generated in the lamp assembly via heat emitting apertures(355).

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of liquid crystal displays, and more particularly, due to heat generated with light in a lamp assembly that generates light necessary for performing a display using liquid crystals, deterioration of characteristics and display performance of liquid crystals is reduced. The present invention relates to a liquid crystal display device which is prevented from being generated.

In general, a “liquid crystal display device” may be defined as a display device that implements an image by using an electro-optical characteristic of a liquid crystal whose light transmittance changes as an electric field is applied.

In order to implement such a liquid crystal display, a panel for applying an electric field to the liquid crystal in units of minute areas, a driving device for controlling the liquid crystal to display a desired screen, and a light supply device for generating light passing through the liquid crystal are required.

In this case, as the light supply device, a cold cathode ray tube lamp having a low power consumption and high brightness is mainly used.

Such a cold cathode ray tube lamp has the advantage of generating high brightness with low power consumption, but heat is generated by the operating characteristics of the cold cathode ray tube lamp at both ends of the cold cathode ray tube lamp.

As described above, heat generated in the cold cathode ray tube type lamp generates dark parts 5 and 6 that are not displayed around the cold cathode ray tube type lamp 4, thereby realizing accurate display. It acts as a cause of difficulty. Reference numeral 1 denotes a conventional liquid crystal display device, and reference numeral 2 denotes a liquid crystal display panel assembly.

This problem is due to the physical properties of the liquid crystal.

Specifically, the liquid crystal physically has an intermediate characteristic between the solid and the liquid, and as the temperature increases, the liquid crystal gradually has the characteristics of the liquid, and thus the characteristics of the liquid crystal are greatly reduced.

For this reason, in order to perform a display using the electro-optical characteristics of the liquid crystal, the liquid crystal must always be able to maintain a constant temperature.

However, in recent years, as the display area of the liquid crystal display device continues to increase, the length of the cold cathode ray tube lamp increases in proportion to the increase of the display area of the liquid crystal display device, and the amount of heat generated increases as the driving voltage of the cold cathode ray tube lamp increases in proportion to the increasing length. to be.

After all, this means that as the display area of the liquid crystal display device increases, the display performance of the liquid crystal display device may deteriorate. In order to achieve the enlargement of the liquid crystal display device, there is a need for a rapid overcoming method.

Therefore, the present invention meets such a demand, and an object of the present invention is to provide heat required for a display to increase the length of the lamp, so that even if the amount of heat generated in the lamp is rapidly dissipated heat generated, the operating characteristics of the liquid crystal This is to minimize the degradation by the heat.

FIG. 1 is a plan view illustrating that display performance is deteriorated locally by a lamp heat in a conventional liquid crystal display.

FIG. 2 is an exploded perspective view of a liquid crystal display device having a structure for rapidly dissipating heat generated from a lamp according to one embodiment of the present invention.

3 is a plan view of a storage container for explaining the relationship between the heat dissipation opening and the lamp assembly to quickly dissipate heat generated by the lamp according to an embodiment of the present invention.

4 is an enlarged partial cutaway view of FIG. 3.

FIG. 5 is a partial cross-sectional perspective view for explaining the relationship between the heat dissipation opening and the lamp assembly in the assembled state of FIG. 2. FIG.

Figure 6 is a plan view of the storage container for explaining the maximizing the heat dissipation performance by maximizing the heat conduction by changing the lamp cover to a brass material and at the same time forming the opening for the heat dissipation in the storage container according to an embodiment of the present invention.

The liquid crystal display device for realizing the object of the present invention is a liquid crystal display panel assembly for controlling the liquid crystal to display an image, a lamp assembly consisting of a lamp and a lamp cover to supply light to the liquid crystal display panel assembly, in the lamp assembly The backlight assembly includes a light uniformity improving unit coupled to the lamp assembly to improve the optical uniformity of the supplied light, and a heat dissipation container including heat dissipation means for fixing the backlight assembly and dissipating heat generated from the lamp assembly.

Hereinafter, a more specific configuration, operations and effects of the configuration of the liquid crystal display according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

2 is an exploded perspective view showing the overall structure of the liquid crystal display device 800 according to an embodiment of the present invention.

Referring to FIG. 2, the liquid crystal display device 800 includes a liquid crystal display module and a case (not shown) coupled to the liquid crystal display module, and the liquid crystal display module is again a chassis 100 and a liquid crystal display panel assembly 200. ), A backlight assembly 345, a liquid crystal display panel assembly 200, and a heat dissipation container 350 for accommodating and fixing the backlight assembly 345.

In detail, the liquid crystal display panel assembly 200 includes the liquid crystal display panel 230 and the driving units 240, 250, 260, and 270.

The liquid crystal display panel 230 is composed of a TFT substrate 220, a liquid crystal (not shown), and a color filter substrate 210.

In this case, the TFT substrate 220 and the color filter substrate 210 have a structure suitable for applying the same or all different powers to the area divided very finely in a matrix form in the assembled state.

When the liquid crystal is injected between the TFT substrate 220 and the color filter substrate 210 which play such a role, the liquid crystal has an arrangement angle depending on the electric field formed between the TFT substrate 220 and the color filter substrate 210. All will be different so that images, text and images can be displayed.

The TFT substrate 220 for implementing this is composed of a transparent substrate, for example, a glass substrate, a thin film transistor, a signal transmission line, and a pixel electrode.

Specifically, a thin film transistor is formed on one side of the glass substrate in a matrix form corresponding to a desired resolution by a semiconductor thin film process.

More specifically, in the thin film transistor, thin film transistors corresponding to three times the horizontal resolution and three times the vertical resolution are formed in a matrix form.

As such, a signal transmission line is formed in the process of forming the thin film transistor by the semiconductor thin film process. The signal transmission line includes a gate line commonly connected to the gate electrodes of the thin film transistors for implementing horizontal resolution, and a data line commonly connected to the source electrode of the thin film transistors for implementing vertical resolution.

On the other hand, the drain electrodes of all the thin film transistors formed on the glass substrate are formed with a pixel electrode made of indium tin oxide material, which is transparent and has low electrical resistance, acting as a conductive metal.

The color filter substrate 210 is coupled to the top surface of the TFT substrate 220 having such a configuration.

The color filter substrate 210 is composed of a glass substrate, an RGB pixel, and a common electrode.

An RGB pixel is formed on one side of the glass substrate so as to face the pixel electrode described above by a semiconductor thin film process, and transparent indium tin oxide is coated over the entire area with a predetermined thickness over the entire surface of the glass substrate while the RGB pixel is formed.

Thereafter, the TFT substrate 220 and the color filter substrate 210 are sealed by a sealant in an aligned state, and then liquid crystal is injected to manufacture the liquid crystal display panel 230.

Thereafter, an input terminal of the gate flexible printed circuit 270 and the data flexible printed circuit 250 is coupled to the gate line and the data line through an anisotropic conductive film, respectively, and the gate flexible printed circuit 270 is provided. The gate printed circuit board 260 or the source printed circuit board 240 are coupled to an output terminal of the data flexible printed circuit 250 through an anisotropic conductive film.

In this case, the gate flexible printed circuit 270 and the data flexible printed circuit 250, the gate printed circuit board 260, and the source printed circuit board 240 constitute a driving unit.

In the liquid crystal display panel assembly 200 having the above configuration, the image signal generated by the information processing apparatus is applied to the driving units 240, 250, 260, and 270 to be processed into a driving signal suitable for driving the liquid crystal display, and then the gate line and the data line. The alignment angle of the liquid crystal is precisely controlled by being applied by the correct timing.

However, even though the liquid crystal is precisely controlled by the liquid crystal display panel assembly 200, the desired image, text, and video are never displayed.

This is because the liquid crystal does not emit light by itself and only controls the transmittance of the terminal light.

This means that light is required in some form to perform the display in the liquid crystal display.

As such, the light required for the display may be obtained from the outside of the liquid crystal display, or may be obtained from the liquid crystal display itself.

When the light required for the display is obtained from the outside of the liquid crystal display device, power consumption of the liquid crystal display device can be minimized, but it has a fatal disadvantage that the display cannot be performed in a dark place where external light is insufficient or lacking.

Recently, a method of generating light in the liquid crystal display itself is somewhat disadvantageous in terms of power consumption, but the display can be performed anywhere.

To implement this, a backlight assembly 345 is required.

The backlight assembly 345 is again composed of a lamp assembly 330, a light uniformity improving unit 342.

The lamp assembly 330 is composed of a lamp 334 and a lamp cover 332 which supplies the light generated by the lamp 334 to the light uniformity improving unit 342, which will be described later, after switching.

The lamp 334 has advantages of high brightness and long life, and a cold cathode ray tube lamp having a small heat generation amount is mainly used.

In this case, the cold cathode ray tube type lamp 334 has an optical distribution in the form of a line light source mainly manufactured in a long rod form, and the liquid crystal display panel assembly 200 requires a linear distribution in the form of a plane so that the linear light source is used as it is. When applied to the panel assembly 200, serious luminance unevenness is inevitable.

For this reason, the optical distribution in the form of a line light source should be changed to the optical distribution in the form of a surface light source.

To implement this, the light uniformity improving unit 342 is required.

The light uniformity improving unit 342 converts the line light source optical distribution to the surface light source optical distribution and simultaneously changes the light guide panel 320 and the upper surface of the light guide plate 320. Installed in the optical sheet 310 to further improve the uniformity of the light emitted from the light guide plate 320, and a reflector plate 340 installed at the bottom of the light guide plate 320 to recycle the light leaked from the light guide plate 320. It is composed of

The light uniformity improving unit 342 and the lamp assembly 330 are positioned below the liquid crystal display panel assembly 200 to supply light having uniform luminance to the liquid crystal display panel assembly 200. do.

In this case, the lamp assembly 330 is inevitably installed to be close to a part of the liquid crystal display panel assembly 200. As such, the lamp assembly 330 and the liquid crystal display panel assembly 200 are in close proximity to each other. The electro-optical characteristics of the liquid crystal of the liquid crystal display panel assembly 200 are inevitably affected by the heat generated from the cold cathode ray tube type lamp 334 of 330.

In an embodiment of the present invention, such a problem is overcome by using a heat dissipation storage container 350 for fixing the light uniformity improving unit 342 and the lamp assembly 330.

Specifically, the heat dissipation storage container 350 has an hexahedral shape as a whole and has an open top surface.

In this case, the lamp assembly 330 and the light uniformity improving unit 342 described above are inserted into the opened upper surface of the heat dissipation storage container 350 and the total weight of the heat dissipation storage container 350 is reduced on the bottom surface. In order to do so, a weight reduction opening (not shown) may be formed in the bottom portion.

3 to 5, in addition to the weight reducing opening, a heat dissipation opening 355 is further provided at a portion of the bottom surface of the heat dissipation storage container 350 that faces the lamp assembly 330.

The heat dissipation opening 355 serves to quickly dissipate heat generated from the lamp assembly 330.

At least one heat dissipation opening 355 having such a function may be formed along the lamp assembly 330 or may be formed only on the electrode portions 372 and 374 of the cold cathode ray tube lamp assembly 334 having a large amount of heat generation.

In particular, the size of the heat dissipation opening 355 and the heat generation amount may be larger than the place where the heat generation amount is relatively small, as well as the shape of the heat dissipation opening 355 may be formed in any shape such as circular, rectangular, square, etc. It is okay.

Meanwhile, in order to more quickly radiate heat generated by the lamp assembly 334 through the heat dissipation opening 355, the material of the lamp cover 332 which is a component of the lamp assembly 330 together with the heat dissipation opening 355 may be used. By changing, the heat radiation efficiency can be greatly improved.

Specifically, referring to FIG. 6, a part of the heat generated in the cold cathode ray tube type lamp 334 of the lamp assembly 330 is radiated through the heat dissipation opening 335, and the rest is transferred along the lamp cover 332.

At this time, the thermal conductivity of the lamp cover 332 has a great influence on the heat dissipation of heat generated in the cold cathode ray tube lamp 334.

That is, a part of the heat intensively generated at both ends of the cold cathode ray tube lamp 334 is heat-conducted along the lamp cover 332 having a high thermal conductivity to the center portion of the lamp cover 332 and the center portion of the lamp cover 332. When it is to be discharged to the opposing heat dissipation opening 335, the heat generated from the cold cathode ray tube type lamp 334 can be discharged more quickly.

The specific example is described as follows.

In an embodiment of the present invention, a heat dissipation property will be described using a lamp cover made of stainless steel and a lamp cover made of brass.

However, the heat dissipation characteristics when using the lamp cover made of brass is much better than that when using the lamp cover made of stainless steel.

This is because the brass lamp cover has about 7 times better thermal conductivity than that of the stainless steel lamp cover. Therefore, the heat generated at both ends of the brass lamp cover is much faster than that of the stainless steel lamp cover. This is because heat is conducted to the portion and heat is conducted quickly to the heat dissipation opening 355.

This means that the heat dissipation opening 355 may be formed in the heat dissipation storage container 350 and the lamp cover 332 may be made of a material having excellent thermal conductivity.

As a result, the liquid crystal display device is enlarged by preventing the dark portions 5 and 6 (shown in FIG. 1) frequently occurring in the liquid crystal display panel assembly 200 opposite to both ends of the conventional cold cathode ray tube lamp 334. It is possible to minimize the deterioration of the characteristics of the liquid crystal caused by the heat that can not but occur.

As described in detail above, the heat generated due to the characteristics of the lamp assembly is radiated in the shortest time by heat dissipation and heat conduction, thereby preventing the deterioration of electro-optical properties of the liquid crystal.

In addition, the heat dissipation of the lamp assembly increases as the size of the liquid crystal display increases, thereby preventing display characteristics of the liquid crystal display from deteriorating, thereby realizing a high performance large liquid crystal display.

In the present invention has been described a preferred embodiment, one of ordinary skill in the art to which the present invention belongs, the present invention within the scope without departing from the spirit and scope of the present invention described in the claims It will be understood that various modifications and changes can be made.

Claims (6)

A liquid crystal display panel assembly for controlling the liquid crystal to display an image; A lamp assembly including a lamp and a lamp cover to supply light to the liquid crystal display panel assembly, and a backlight assembly including a light uniformity improving unit coupled to the lamp assembly to improve optical uniformity of light supplied from the lamp assembly. ; And And a heat dissipation storage container having heat dissipation means for fixing the backlight assembly and dissipating heat generated from the lamp assembly. The liquid crystal display device according to claim 1, wherein the heat dissipation means is formed to face the lamp cover of the lamp assembly in the heat dissipation storage container. 2. The liquid crystal display device according to claim 1, wherein the heat dissipation means is a heat dissipation opening formed in at least one heat dissipation container facing the lamp cover with a predetermined distance from each other. 4. The liquid crystal display device according to claim 3, wherein the formation density of the heat dissipation means is higher at the electrode portion of the lamp than at the center portion of the lamp. The liquid crystal display device according to claim 1, wherein the heat dissipation means is a heat dissipation opening in which at least one heat dissipation container is formed opposite to both ends of the lamp cover. The liquid crystal display of claim 1, wherein the lamp cover is made of brass.