KR101120486B1 - Bottom chassis for lcd led-monitor using aluminium alloy and lcd led-monitor applicated the bottom chassis - Google Patents

Abstract

Disclosed are a rear chassis that covers various parts including a backlight unit in a rear surface of an LCD LED monitor using LEDs as a light source, and an LCD LED monitor that can contribute to weight reduction, slimness, and optical characteristics as a whole.

The rear chassis for LCD LED monitors according to the present invention is an aluminum alloy containing aluminum (Al) as a main component, with respect to the total weight of the alloy, Mn: 0.80 to 1.25% by weight, Mg: 0.80 to 1.30% by weight, Cu: 0.05 to 0.20% by weight, Si: 0.15 to 0.35% by weight, Fe: 0.35 to 0.75% by weight, Zn: 0.20% by weight or less, Cr: 0.01 to 0.06% by weight, Ti: 0.10% by weight or less, Ni: 0.005% by weight or less Characterized in that the formed material.

Description

BOTTOM CHASSIS FOR LCD LED-MONITOR USING ALUMINIUM ALLOY AND LCD LED-MONITOR APPLICATED THE BOTTOM CHASSIS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LCD LED monitor using a light emitting diode (LED) as a light source, and more particularly to a back chassis for covering various units including a back light unit in an LCD LED monitor. ) And an LCD LED monitor using the same.

An LCD (Liquid Crystal Display) monitor is a type of flat panel display, and is a device for displaying image information output from a computer by controlling the change of liquid crystal and the amount of light passing through the polarizer.

LCD monitors typically include a liquid crystal panel unit, a light guide plate, a back light unit, a top chassis, a bottom chassis and a pedestal.

The liquid crystal panel unit includes a liquid crystal, and adjusts surface light emitted from the backlight unit to display image information output from a computer.

The backlight unit is a portion including a light source to irradiate surface light to the liquid crystal panel unit. The backlight unit is essentially included in the LCD monitor because the liquid crystal panel unit does not have a self-light emitting function.

The light source of the backlight unit is mainly used a Cold Cathode Fluorescent Lamp (CCFL) and a Light Emitting Diode (LED). In the case of the dual LED, it has been attracting much attention because it can realize a clear image with excellent life characteristics, low power consumption, and can minimize the portion of the light source in the size or monitor, thereby making the LCD monitor slimmer. .

The front chassis serves to cover the liquid crystal panel unit from the front side in order to prevent the liquid crystal panel unit from being separated.

The pedestal is coupled to the rear chassis to support the LCD monitor and to adjust the height and angle of the LCD monitor.

The rear chassis serves to cover or receive the backlight unit, and also to release heat generated from the light source. Such a rear chassis is required to be excellent in strength and formability. In addition, as the LCD monitor becomes thinner and lighter, the rear chassis also needs to be slimmer.

Conventional rear chassis is mainly used for steel (Steel), when the thickness of the chassis is thin, the strength is not good, mainly complemented the strength by using a relatively thick thing of more than 1.2mm. However, this acted as an obstacle to the slimming of the rear chassis described above.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rear chassis for an LCD LED monitor using an aluminum alloy that can improve weight, slimness, optical properties, etc., in designing a rear chassis for an LCD LED monitor.

Another object of the present invention is to provide a LCD LED monitor that can apply the rear chassis using the aluminum alloy, the overall thickness reduction and light weight can be pursued.

In order to achieve the above object, a rear chassis for an LCD LED monitor according to an embodiment of the present invention is an aluminum alloy containing aluminum (Al) as a main component, and Mn: 0.80 to 1.25% by weight, and Mg: based on the total weight of the alloy. 0.80 to 1.30% by weight and Cu: characterized in that formed from a material containing 0.05 to 0.20% by weight.

At this time, the aluminum alloy is Si: 0.15 to 0.35% by weight, Fe: 0.35 to 0.75% by weight, Zn: 0.20% by weight or less, Cr: 0.01 to 0.06 with respect to the total weight of the alloy in order to improve the strength and formability, etc. Weight% and Ti: 0.10% by weight or less may be further included, and in order to improve the high temperature mechanical strength, Ni: 0.005% by weight or less may be further included with respect to the total weight of the alloy.

The aluminum alloy may have a tensile strength in the range of 200 to 230 MPa, a yield strength in the range of 135 to 165 MPa, and an elongation of 12% or more.

LCD LED monitor according to an embodiment of the present invention for achieving the above another object is a liquid crystal panel unit for displaying a planar image; A backlight unit including an LED as a light source and emitting surface light to the liquid crystal panel unit; A front chassis for fixing the liquid crystal panel unit from the front; A rear chassis for covering the backlight unit from the rear; And a pedestal coupled to the rear chassis to support the monitor, wherein the rear chassis is formed of an aluminum alloy, and Mn: 0.80 to 1.25% by weight, Mg: 0.80 to 1.30% by weight, and Cu : Characterized in that formed from a material containing 0.05 to 0.20% by weight.

In this case, the LED may be disposed at an edge of the backlight unit to have an edge type backlight structure.

The rear chassis for LCD LED monitors according to the present invention is aluminum having a tensile strength in the range of 200-230 MPa, yield strength in the range of 135-165 MPa and elongation rate of 12% or more. It is formed of an alloy and has excellent strength and formability even with a thickness of 1.0 mm or less.

In addition, the rear chassis manufactured using the aluminum alloy according to the present invention has excellent heat transfer efficiency, and can reduce the thickness and weight of the rear chassis, thereby making the overall LCD LED-monitor slim.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and those skilled in the art to which the present invention pertains. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, a back chassis for an LCD LED monitor using an aluminum alloy and an LCD LED monitor using the same will be described in detail with reference to the accompanying drawings.

FIG. 1 schematically shows an example of an LCD LED monitor applicable to the present invention, and FIG. 2 schematically shows an exploded perspective view of portions other than the pedestal portion of the LCD LED monitor shown in FIG. will be.

1 and 2, the LCD LED monitor includes a liquid crystal panel unit 101 including liquid crystal, a backlight unit 102 including an LED light source, a rear chassis 110, a front chassis 120, and a pedestal ( 130).

Here, the LCD LED monitor means an LCD monitor using LED as a light source.

The liquid crystal panel unit 101 displays a planar image by using light emitted from the backlight unit 102.

The backlight unit 102 irradiates uniform surface light from the rear surface of the liquid crystal panel unit 101. To this end, the backlight unit may include various optical sheets such as a light guide plate and a diffusion plate.

The backlight unit 102 is divided into a direct type and an edge type according to the position of the light source. In the case of the direct type, a light source and a reflecting plate are disposed under the backlight unit to irradiate surface light to the liquid crystal panel unit. On the other hand, in the case of the edge type, the light source is placed at the edge of the backlight unit and the surface light is irradiated to the liquid crystal panel unit using the light guide plate.

Considering the overall shape of the LCD LED monitor, the direct type has a light source on the back side of the LCD LED monitor, and the edge type has a light source on the side of the LCD LED monitor. Therefore, it is more preferable to use an edge type in the case of an ultra-thin LCD LED monitor.

The front chassis 120 fixes the liquid crystal panel unit 110 from the front side to protect the liquid crystal panel unit 101 from external shocks and prevent the liquid crystal panel unit 101 from being separated.

Pedestal 130 is coupled to the rear chassis 110 to support the LCD LED monitor, and serves to adjust the height and angle of the LCD LED monitor. To this end, the pedestal 130 includes a connecting portion 131 coupled to the rear chassis 110 and a support plate 132 fixed to the bottom.

The rear chassis 110 covers the backlight unit 102 from the rear side. In addition, the rear chassis 110 serves to transfer heat generated from the LED light source of the backlight unit 102 to the outside, and is electrically connected to the light source of the backlight unit 102 and other internal circuits, so that it is grounded. Plays a role.

The rear chassis 110 may be manufactured in various forms according to its use state, such as when directly storing the backlight unit, serving as a simple cover.

The rear chassis 110 greatly influences the overall thickness reduction and light weight of the LCD LED monitor. In the present invention, in order to improve the characteristics of the rear chassis 110, one formed of an aluminum alloy material is used.

The aluminum (Al) alloy applied to the rear chassis for the LCD LED monitor according to the present invention includes manganese (Mn), magnesium (Mg) and copper (Cu) as the main component aluminum (Al).

At this time, the addition amount of each substance is preferably Mn: 0.80 to 1.25% by weight, Mg: 0.80 to 1.30% by weight and Cu: 0.05 to 0.20% by weight based on the total weight of the alloy.

manganese( Mn )

Manganese (Mn) combines with aluminum to form a dispersed phase such as Al ₆ Mn, Al ₁₂ Mn, and also combines with Al, Fe, and Si to form a quaternary compound of Al-Fe-Mn-Si. These dispersed phases are uniformly dispersed in the fine phase of 0.05 ~ 0.5㎛ size in the alloy before aging treatment to exhibit the mechanical properties required for the molded article.

In addition, when the aging treatment is performed, the Mn-based dispersed phases precipitate and disperse fine and uniform Mg ₂ Si in the position of the stable α-Al (Fe, Mn) Si compound in the alloy structure. It inhibits (breakage of molding materials) and promotes the transformation of the unstable βAl-Fe-Si phase to the stable α phase to relieve stress concentrated on the crack tip.

Mn playing such a role is preferably included in the content ratio of 0.8 ~ 1.25% by weight of the total weight of the alloy, more preferably 0.883% by weight can be presented. When Mn is included in less than 0.8% by weight, the effect of improving the strength of the alloy structure is low because the alloy structure is low. In addition, when Mn is added in excess of 1.25% by weight, there is a problem that the strength is rather lowered.

magnesium( Mg )

Magnesium (Mg) is an element necessary for imparting sufficient strength to Al, and combines with Si during aging treatment to form Mg ₂ Si (magnesium silicate) intermetallic compound, which is a precipitated phase, thereby improving strength.

The Mg is preferably included in 0.8 ~ 1.30% by weight of the total weight of the alloy, more preferably 1.218% by weight can be presented. When Mg is included in the above range, the strength and elongation of the alloy may be improved. When the content of Mg is less than 0.80% by weight, the strength-improving effect is low because Mg _{2 and} Si do not sufficiently form Mg ₂ Si effective for strength improvement. In addition, when Mg is added in excess of 1.30% by weight, there is a problem that the moldability is sharply lowered.

Copper( Cu )

Copper (Cu) is added to increase the solid solution strengthening and toughness in the aluminum alloy.

The Cu is preferably added in a content ratio of 0.05 to 0.20% by weight of the total weight of the aluminum alloy, more preferably 0.165% by weight can be presented. If Cu is added at less than 0.05% by weight, the solid solution strengthening and toughness cannot be expected as above, and when it is used in excess of 0.20% by weight, the effect of the solid solution strengthening can be obtained. The problem occurs that deformation occurs.

In addition to the Mn, Mg, and Cu described above, silicon (Si), iron (Fe), zinc (Zn), chromium (Cr), titanium (Ti), and nickel (Ni) to improve mechanical strength and formability. ) May be further included.

At this time, the addition amount of each material, based on the total weight of the alloy, Si: 0.15 to 0.35% by weight, Fe: 0.35 to 0.75% by weight, Zn: 0.20% by weight or less, Cr: 0.01 to 0.06% by weight, Ti: 0.10% by weight or less And Ni: preferably 0.005% by weight or less.

silicon( Si )

Silicon (Si) is a basic element constituting an aluminum alloy system with the magnesium (Mg), and combines with Mg during aging treatment to form Mg ₂ Si to improve the strength.

The Si is preferably included in 0.15 ~ 0.35% by weight of the total weight of the alloy, more preferably 0.199% by weight can be presented. When Si is added at less than 0.15% by weight, Mg ₂ Si may not be sufficiently formed and strength improvement cannot be expected and the surface quality of the alloy is lowered. In addition, when Si is added in excess of 0.35% by weight, there is a problem in that the moldability is sharply lowered.

iron( Fe )

Iron (Fe) is contained as an impurity in aluminum alloys.

Fe combines with Al, Mn, and Si to form a quaternary compound to play a role of improving strength.

The Fe is preferably included in the content ratio of 0.35 ~ 0.75% by weight of the total weight of the aluminum alloy, more preferably 0.511% by weight can be presented. If the Fe content exceeds 0.75% by weight, there is a problem in reducing the formability and ductility, and if Fe is added in less than 0.35% by weight, the formation of Al-Fe-Mn-Si quaternary compounds is insignificant and does not contribute to the strength improvement. can not do it.

chrome( Cr )

Chromium (Cr) is an effective material for miniaturizing recrystallized grains, making uniform structures, and improving strength in aluminum alloys.

The Cr is preferably included in the content ratio of 0.01 to 0.06% by weight of the total weight of the aluminum alloy, more preferably 0.025% by weight can be presented. If Cr is added in an amount less than 0.01% by weight, the above effects cannot be expected. If Cr is added in an amount of more than 0.06% by weight, coarse intermetallic compounds are formed, and thus, elongation is lowered.

titanium( Ti )

Titanium (Ti) serves to increase the formability by making the crystal grains fine in the aluminum alloy.

The Ti is preferably added at 0.10% by weight or less, and more preferably 0.015% by weight of the total weight of the aluminum alloy. When the Ti is added in excess of 0.10% by weight, coarse intermetallic compounds are formed to lower moldability.

zinc( Zn )

Zinc (Zn) is added to impart the corrosion resistance of the aluminum alloy, and also serves to enhance the strength of the alloy in work hardening heat treatment.

The Zn is preferably added at 0.20% by weight or less, more preferably 0.039% by weight. If Zn is added in excess of 0.20% by weight, casting or rolling of the aluminum alloy may be difficult.

nickel( Ni )

Nickel (Ni) is added to the aluminum alloy to form Ni-containing precipitates and serves to improve the high temperature mechanical strength.

Ni is preferably added at 0.005% by weight or less of the total weight of the aluminum alloy, and more preferably 0.003% by weight. When Ni is added in excess of 0.005% by weight, high temperature fatigue strength and elongation are lowered by forming coarse precipitates.

Aluminum alloy for the back chassis applied to the present invention is the manganese (Mn), magnesium (Mg), copper (Cu), silicon (Si), iron (Fe), zinc (Zn), chromium (Cr), titanium ( In addition to Ti) and nickel (Ni), other materials may be included in a range that does not change the physical properties of the alloy, and the balance becomes aluminum (Al). Aluminum may be approximately 95.55 to 97.95% by weight based on the total weight of the alloy.

As described above, Mn: 0.80 to 1.25% by weight, Mg: 0.80 to 1.30% by weight, Cu: 0.05 to 0.20% by weight, Si: 0.15 to 0.35% by weight, Fe: 0.35 to 0.75% by weight, Zn: 0.20% by weight or less Among the aluminum alloys having a composition containing Cr: 0.01 to 0.06% by weight, Ti: 0.10% by weight or less, and Ni: 0.005% by weight or less, the alloy applied to the LCD LED monitor as in the present invention is called SN230 or SG230. Shall be.

The aluminum alloy according to the present invention including the Mn, Mg, Cu and the like may have a thickness of 0.3 ~ 1.5mm when used as a rear chassis. If the thickness is less than 0.3 mm, it is difficult to secure sufficient strength when used as a rear chassis for LCD LED monitors. If the thickness is more than 1.5 mm, an excessive amount of raw materials for forming an alloy is required, thereby increasing the manufacturing cost of the rear chassis. As the weight increases, the weight of the rear chassis of the present invention cannot be reduced.

Meanwhile, SG230 (SN230), which is an aluminum alloy applied to the present invention, may exhibit tensile strength in the range of 200 to 230 MPa, yield strength in the range of 135 to 165 MPa, and elongation of at least 12%. have.

In addition, SG230 (SN230) may represent a heat transfer constant k of 170 W / m · K or more. Given that the typical aluminum alloy is about 130 W / m-K, this is a very improved value.

In LCD LED monitors, LEDs are used as a light source, so a lot of heat is generated during driving, and when the rear chassis fails to effectively discharge them to the outside, the sheets remaining as the optical sheets included in the backlight unit are bent due to the remaining heat. The phenomenon may occur, and bad phenomena such as light leakage may occur at each edge portion. However, in the case of the aluminum alloy according to the present invention, due to the excellent heat conduction characteristics, such a phenomenon such as the sheetum phenomenon, light leakage can be prevented.

Figure 3 shows a strain-stress graph of the aluminum alloy (SG230) applied to the rear chassis for LCD LED-monitor according to the present invention.

For example, 0.199% Si, 0.511% Fe, 0.165% Cu, 0.883% Mn, 1.218% Mg, 0.039% Zn, 0.015% Ti, 0.025% Cr, 0.0025% Ni and 0.003% Ni and the rest. An aluminum alloy (SG230) composed of aluminum and having a thickness of 1 mm was used.

As a comparative example, AA5052-O having a thickness of 1.2 mm, which is widely used as a conventional aluminum alloy, was used.

Referring to FIG. 3, in the case of Example SG230, yield strength is about 150 MPa, whereas in Comparative Example AA5052-O, the yield strength is about 80 MPa, and in case of Example SG230. In spite of the thinner thickness, yield strength improved by about 2 times.

In addition, in the case of Example (SG230), the tensile strength (Tension Strength) is about 230MPa, whereas in Comparative Example (AA5052-O), the tensile strength is 175MPa, the tensile strength of the Example (SG230) is also 30% A degree improved value was shown.

On the other hand, in the case of the elongation rate (Elongation Rate), the comparative example (AA5052-O) was about 23%, in the example (SG230) it was 24% or more.

Although not shown in the drawing, in the case of Comparative Example (AA5052-O), the heat transfer constant (k) was only about 130 W / m? K, whereas in the case of Example (SG230), the heat transfer constant (k) was 170 W / m? K or more. The heat transfer constant of Example (SG230) was superior to that of Comparative Example (AA5052-O) by 30% or more, showing excellent thermal conductivity.

Although not shown in the graph, in the case of the example (SG230), the electrical conductivity was 26 MS / m or more, which is a value indicating the electrical conductivity of 44% or more of the electrical conductivity (58 MS / m) of copper (Cu).

Although the above has been described with reference to one embodiment of the present invention, various changes and modifications can be made at the level of those skilled in the art. Such changes and modifications may belong to the present invention without departing from the scope of the present invention. Therefore, the scope of the present invention will be determined by the claims described below.

1 schematically illustrates an example of an LCD LED monitor applicable to the present invention.

FIG. 2 schematically illustrates an exploded perspective view of portions other than the pedestal portion of the LCD LED monitor shown in FIG.

Figure 3 shows a strain-stress graph of the aluminum alloy (SG230) applied to the rear chassis for LCD LED-monitor according to the present invention.

Claims (10)

As a back chassis which covers the backlight unit of the LCD LED monitor which uses LED as a light source from the back, The rear chassis is an aluminum alloy having the highest weight ratio of aluminum (Al) among the alloying components, and Mn: 0.80 to 1.25% by weight, Mg: 0.80 to 1.30% by weight and Cu: 0.05 to 0.20% by weight based on the total weight of the alloy. It is formed of a material that contains, the rear chassis for LCD LED monitors, characterized in that it has a tensile strength (Tension Strength) range of 200 ~ 230MPa and yield strength (Yield Strength) of 135 ~ 165MPa range. The method of claim 1, The aluminum alloy is Si: 0.15 to 0.35% by weight, Fe: 0.35 to 0.75% by weight, Zn: 0.20% by weight or less, Cr: 0.01 to 0.06% by weight, Ti: 0.10% by weight or less, and Ni: 0.005% by weight or less The rear chassis for the LCD LED monitor, characterized in that it is further included. The method according to claim 1 or 2, The rear chassis Back chassis for LCD LED monitors, characterized by a thickness in the range of 0.3-1.5 mm. delete delete The method according to claim 1 or 2, The rear chassis Back chassis for LCD LED monitors, characterized by an elongation rate of at least 12%. A liquid crystal panel unit displaying a planar image; A backlight unit including an LED as a light source and emitting surface light to the liquid crystal panel unit; A front chassis for fixing the liquid crystal panel unit from the front; A rear chassis for covering the backlight unit from the rear; And And a pedestal coupled to the rear chassis to support the monitor. The rear chassis is an aluminum alloy having the highest weight ratio of aluminum (Al) among the alloying components, and Mn: 0.80 to 1.25% by weight, Mg: 0.80 to 1.30% by weight and Cu: 0.05 to 0.20% by weight based on the total weight of the alloy. Is formed of a material containing, LCD LED-monitor characterized in that it has a tensile strength (Tension Strength) of 200 ~ 230MPa range and Yield Strength of 135 ~ 165MPa range (Yield Strength). The method of claim 7, wherein The aluminum alloy is Si: 0.15 to 0.35% by weight, Fe: 0.35 to 0.75% by weight, Zn: 0.20% by weight or less, Cr: 0.01 to 0.06% by weight, Ti: 0.10% by weight or less, and Ni: 0.005% by weight or less LCD LED monitor further comprises. 9. The method according to claim 7 or 8, The LEDs And an LCD LED monitor disposed at an edge of said backlight unit. 9. The method according to claim 7 or 8, The rear chassis LCD LED monitor, characterized in that having a thickness in the range of 0.5 ~ 1.5mm.

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