KR100837700B1 - Led back-light for lcd test device - Google Patents

Abstract

An LED backlight for an LCD test device is provided to use an LED as a light source and cool the LED effectively by using a peltier device, thereby lengthening a lifetime of the LED. An LED(Light Emitting Diode) backlight for an LCD(Liquid Crystal Display) test device comprises a frame(210), a frame(220) for attaching a fan, an LED panel(260), a heat emitting plate(240), plural cooling fans(230), a peltier device(250), a fixed frame(320) and a power controller. The LED panel comprises the following parts. A plate is made from aluminum. A first insulating layer is made from ceramic material and coated in the front of the plate. A metal pattern is patterned in an upper surface of the first insulating layer. A second insulating layer is made from transparent material and coated in the front of the metal pattern. A mount part of the second insulating layer is etched. Plural LEDs are mounted to be electrically connected with the metal pattern. The plural cooling fans are attached to the rear of the heat emitting plate so as to correspond to fan holes(211) of the frame for attaching a fan. The peltier device is formed in a square plate shape and has a cooling surface and a heat emitting surface in both sides. The cooling surface is attached to the LED panel through thermal conductive grease to be fixed. The heat emitting surface is attached to a heat emitting plate through the thermal conductive grease to be fixed. Therefore, the LED panel is cooled.

Description

LED backlight for LCD test device {LED BACK-LIGHT FOR LCD TEST DEVICE}

1 and 2 are views showing a general LCD test apparatus,

Figure 3 is an exploded perspective view showing the configuration of the LED backlight for the LCD test apparatus according to the present invention,

Figure 4 is a perspective view showing the configuration of the LED backlight for the LCD test apparatus according to the present invention,

5 is a perspective view showing a state in which the Peltier device is attached to the back of the LED panel of the LED backlight for the test device according to the present invention;

Figure 6 is a cross-sectional view showing the configuration of the LED panel attached to the Peltier element and the heat sink of the LED backlight for the LCD test apparatus according to the present invention,

Figure 7 is a block diagram showing the configuration of the power control unit of the LED backlight for the LCD test apparatus according to the present invention.

<Explanation of symbols on main parts of the drawings>

210: frame 220: fan attachment frame

230: cooling fan 240: heat sink

250: Peltier element 260: LED panel

270: reflector 280: first transparent glass

290: prism sheet 300: protective sheet

310: second transparent glass 320: fixed frame

330: power control unit

The present invention relates to an LED backlight for an LCD test apparatus, and more particularly, to an LED backlight for an LCD test apparatus for using a high-brightness LED having a semi-permanent lifetime as a light source.

In general, the LCD test apparatus automatically transfers the LCD panel to the point where the operator is located to easily visually check whether the LCD panel is defective or good, and when the inspection is completed, the LCD according to the inspection result It refers to a device that classifies panels into good, repair, and reject and places them in a cassette.

As shown in FIGS. 1 and 2, in the general LCD test apparatus, an inspection unit 2 for inspecting the LCD panel 100 is disposed at one side of the main body 1, and an LCD is disposed at one side of the inspection unit 2. The loading / unloading unit 7 for supplying and recovering the panel 100 is disposed.

In addition, the LCD test apparatus includes a carrier 9 which conveys the LCD panel 100 from the loading / unloading unit 7 to the inspection unit 2 and the inspection unit 2 from the loading / unloading unit 7. It is installed to move left / right.

The inspection unit 2 comprises a probe unit 11 and a work stage 4 which contacts the LCD panel 100 to the probe unit 3 and provides a light source. The work stage 4 is composed of a polarizing plate 4a and a backlight 4b, and at the rear of the work stage 4, the work stage 4 is aligned with the probe unit 3, and the probe unit 3 ) Is provided with an XYZθ stage (5).

The loading / unloading unit 7 is provided with a subtable 8 for tilting the LCD panel conveyed from the loader (not shown) at a predetermined angle (for example, 60 degrees).

In addition, in the front of the inspection unit 2, when an abnormality is found during visual inspection of the LCD panel 100, the microscope 6 for allowing the operator to check this more precisely is installed to be able to move vertically and horizontally.

Referring to the inspection process made in the conventional LCD inspection apparatus as described above is as follows.

The LCD panel 100 is transferred from the loader (not shown) of the loading / unloading unit 7 to the subtable 8, and the subtable 8 is inclined at a predetermined angle to the carrier 9 with the LCD panel 100. ). Subsequently, the carrier 9 conveys the LCD panel 100 to the inspection unit 2. When the LCD panel 100 to be tested is positioned in the inspection unit 2, the XYZθ stage 5 is advanced from the rear to vacuum suction the LCD panel 100 of the carrier 9, and the fixed LCD panel 100 is fixed. Pads (not shown) are connected to lead pins (not shown) of the probe unit 3.

When the electrical connection is made between the LCD panel 100 and the probe unit 3 as described above, a predetermined image signal is applied through the probe unit 3 and the illumination of the backlight 4b is an external image signal input device. The pattern generator is changed into various patterns by the pattern generator, and the operator determines the defect of the panel by the pattern implemented at this time.

On the other hand, the backlight for providing light is equipped with a plurality of ballasts and a slot for supplying power to the ballast inside the box-shaped case in which only the upper part is opened, and covers the inside of the case so as to be located above the ballast and the slot Is coupled, a plurality of lamps (cold cathode tube) is coupled to the lamp holder is connected to the upper portion of the cover, and the fan is provided on both sides of the case to have an air flow in one direction to cool the lamp.

However, the backlight as described above uses a lamp with a limited lifetime, such as a cold cathode tube, as a light source, and thus requires frequent lamp replacement, low brightness, and high power consumption.

The present invention is to solve the above problems, by using a high-brightness LED having a semi-permanent life as a light source, by cooling the LED using a Peltier element and a cooling fan to increase the brightness, easy maintenance, power consumption It is an object of the present invention to provide an LED backlight for an LCD test apparatus that can lower the relatively.

Features of the present invention for achieving the above object,

A frame formed in a rectangular shape and having a front and rear surface open; A fan attachment frame formed in a plate shape and having a plurality of fan holes formed on the inner rear surface of the frame; An LED panel having a plurality of LEDs mounted on a front surface thereof; A heat sink attached to a rear surface of the LED panel; A plurality of cooling fans attached to the rear surface of the heat sink to correspond to the fan holes of the fan attachment frame; A Peltier element attached between the LED panel and the heat sink to cool the LED panel; It is characterized in that it comprises a fixing frame which is formed in the shape of a square ring to fix the LED panel and the heat sink to the frame fixed to the front of the frame.

Here, the LED backlight for the LCD test apparatus further includes a power control unit for controlling the power supply to the LED panel, the cooling fan and the Peltier device.

Here, the frame is further formed with a plurality of fan holes on the side, each fan hole is attached to the auxiliary cooling fan, the handle is formed on both left and right sides.

The LED panel may further include an aluminum plate; A first insulating film coated on the entire surface of the plate with a ceramic material; A metal pattern patterned on an upper surface of the first insulating layer; A second insulating layer coated on the entire surface of the metal pattern with a transparent material and having a mounting portion etched thereon; And the plurality of LEDs mounted to be electrically connected to the metal pattern.

Here, the LED panel is further attached to the front reflector reflecting the light of the LED.

Here, the first transparent glass between the reflecting plate of the LED panel and the fixing frame; A prism sheet positioned on the front surface of the first transparent glass to improve the straightness of the light of the LED; A protective sheet positioned on the front surface of the prism sheet; And a second transparent glass for pressing and fixing the protective sheet and the prism sheet to the first transparent glass.

Here, the Peltier device is formed in a rectangular plate shape and has cooling surfaces and a heating surface on both sides thereof, the cooling surface is attached to the LED panel, and the heating surface is attached to the heat sink.

Here, the Peltier element is fixed to the LED panel and the heat sink by heat conductive grease.

Here, the power control unit includes a power supply means for receiving the commercial power to supply the necessary power to each component; A temperature sensor installed at one side of the LED panel to detect a temperature of the LED panel; An A / D converter for converting a sensing signal sensed by the temperature sensor into a digital signal; A keypad for adjusting the brightness of the LED panel according to a user's button setting; A display for numerically displaying the brightness of the LED panel according to external control; Cooling the LED panel by controlling the cooling fan and the Peltier element according to pre-stored logic using the temperature signal input from the A / D converter, and the LED panel is above the preset temperature even when cooling is performed. A central processing unit for outputting a power cutoff signal when the heat is generated and controlling brightness of the LED panel according to an input of the keypad; A relay installed on a line of the power supply means to cut off input power to which a power cutoff signal is input from the central processing unit; And a driver installed between the central processing unit and the Peltier element, the central processing unit and the cooling fan, and the central processing unit and the LED panel, respectively, and outputting a driving signal under the control of the central processing unit.

Here, the power control unit is installed on one side of the LED panel, and is installed on the line of the power supply means to mechanically turn on the power of the power supply means when the heat generation amount of the LED panel exceeds a predetermined heat generation amount It is further provided with a thermostat for blocking.

Hereinafter, the configuration of the LED backlight for an LCD test apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

Figure 3 is an exploded perspective view showing the configuration of the LED backlight for the LCD test apparatus according to the present invention, Figure 4 is a perspective view showing the configuration of the LED backlight for the LCD test apparatus according to the present invention, Figure 5 is an LCD test according to the present invention Peltier device attached to the back of the LED panel of the LED backlight for the device is a perspective view, Figure 6 shows the configuration of the LED panel of the Peltier device and the heat sink is attached to the rear of the LED backlight for testing device according to the present invention 7 is a block diagram illustrating a configuration of a power control unit of an LED backlight for an LCD test apparatus according to the present invention.

3 to 7, the LED backlight 200 for an LCD test apparatus according to the present invention includes a frame 210, a frame for attaching a fan 220, a cooling fan 230, a heat sink 240, , Peltier element 250, LED panel 260, reflecting plate 270, first transparent glass 280, prism sheet 290, protective sheet 300, second transparent glass 310 ), A fixed frame 320, and a power control unit 330.

First, the frame 210 is formed in a rectangular shape of a metal material, and the front and rear surfaces are formed to be open, and a plurality of fan holes 211 are further formed on the side surfaces, so that the auxiliary cooling fan 213 is attached to each fan hole 211. The handles 215 are formed on both side surfaces.

In addition, the fan mounting frame 220 is formed in a rectangular plate shape of a metal material, a plurality of fan holes 221 are formed and attached to the inner rear of the frame 210 by bolts.

In addition, the cooling fans 230 correspond to the fan holes 221 formed in the fan mounting frame 220, respectively, and are coupled to the fan mounting frame 220 by bolts.

In addition, the heat sink 240 is formed of a material such as aluminum in the form of a conventional heat sink is located on the front of the cooling fan 230 to transfer heat to the cooling fan 230.

On the other hand, the Peltier element 250 is formed in a rectangular plate form having a cooling surface 251 and a heat generating surface 253 on both sides, the heat generating surface 253 is attached to the front surface of the heat sink 240 and will be described below. A cooling surface 251 is attached to the rear surface of the LED panel 260 to cool the LED panel 260. Here, the Peltier element 250 is also referred to as a thermo-electric cooler (TEC), which is a cooling method that finds that one side becomes high temperature and the other side becomes low temperature when a direct current flows by joining two different metals as a semiconductor element. Here, the Peltier element 250 is attached to the LED panel 260 and the heat sink 240 by the thermal conductive grease 255 to increase the thermal conductivity because the LED panel 260 and the heat sink 240 are not flat. It is preferable to be fixed. Here, the Peltier element 250 may be fixed between the LED panel 260 and the heat sink 240 in accordance with the size, each fixed position is attached to a position that can perform the heat radiation most efficiently It is preferable.

The LED panel 260 may include a plate 261 made of aluminum, a first insulating layer 263 coated on the front surface of the plate 261 with a ceramic material, and a metal pattern patterned on the upper surface of the first insulating layer 263. 265, a second insulating film 267 coated on the entire surface of the metal pattern 265 with a transparent insulating material such as epoxy, and a plurality of LEDs 269 mounted to be electrically connected to the metal pattern 265. Here, the metal pattern 265 forms a metal layer by depositing a metal material selected from aluminum (Al) or aluminum alloy (AlNd) or chromium (Cr), molybdenum (Mo), copper (Cu), and copper alloy on the entire surface. And then applying a photoresist, exposing using a mask (not shown) having a light transmitting region and a blocking region, developing the exposed photoresist, etching the exposed metal layer, and the like. It forms by performing the mask process to pattern the said metal layer.

In addition, the reflector plate 270 includes a plurality of LED holes 271 to penetrate each LED 269 of the LED panel 260, and is further attached to the front surface of the LED panel 260 to light the LED 269. Reflects.

In addition, the first transparent glass 280 is formed in the shape of a rectangular plate made of a transparent glass material and is located on the front surface of the reflecting plate 270, and the prism sheet 290 is formed in the shape of a rectangular plate made of a transparent material to provide light of the LED 269. Located on the front of the first transparent glass 280 to improve the straightness, the protective sheet 300 is formed in a rectangular plate shape of a transparent material to be located on the front of the prism sheet 290 to protect the prism sheet 290 The second transparent glass 310 may be formed in a rectangular plate shape with a transparent glass material to compress and fix the protective sheet 300 and the prism sheet 290 to the first transparent glass 280. It is located in the front.

On the other hand, the fixing frame 320 is formed in a rectangular ring shape of a metal material to fix the LED panel 260 and the heat sink 240 to the frame 210 is fixed by a bolt on the front of the frame 210.

In addition, the power control unit 330 is installed on one side of the LED panel 260 to sense the temperature of the power supply means 331 and the LED panel 260 to receive the commercial power to supply the necessary power to each component. A temperature sensor 332, an A / D converter 333 for converting a sensing signal detected from the temperature sensor 332 into a digital signal, and an LED 269 of the LED panel 260 according to a user's button setting. A keypad 334 for adjusting the brightness, a display 335 for numerically displaying the brightness of the LEDs 269 of the LED panel 260 under the control of the central processing unit to be described below, and an A / D converter 333. Cooling the LED panel 260 by controlling the cooling fan 230 and the Peltier element 250 according to the pre-stored logic using the temperature signal input from the LED panel 260 is a state in which cooling is being performed. If it generates over the set temperature, the power off signal is output. An input power source installed on a line of the central processing unit 336 that controls the brightness of the LED panel 260 according to the input of the pad, and a power cutoff signal from the central processing unit 336. Relays 337, the central processing unit 336 and the Peltier element 250, the central processing unit 336 and the cooling fan 230, the central processing unit 336 and the LED of the LED panel 260 ( And drivers 338 respectively installed between the 269 and outputting driving signals under the control of the central processing unit 336. Here, the power control unit 320 is installed on one side of the LED panel 260, and is installed on the line of the power supply means 331, the shape when the heat generation amount of the LED panel 260 exceeds a predetermined heat generation amount The deformation further includes a thermostat 339 that mechanically cuts off the power supply of the power supply means 331. Here, the keypad 334 and the display 335 may be installed to be exposed to one side of the frame 210 to allow user manipulation and visual confirmation, or may be installed to be exposed to the LCD test apparatus.

Hereinafter, an assembly process and operation of an LED backlight for an LCD test apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

First, the cooling surface 251 of the Peltier element 250 is attached to the rear surface of the LED panel 260 through the heat conduction grease 255, and the heat generating surface 253 of the Peltier element 250 is attached to the heat sink 240. Attach it to the front via thermal grease (255).

Then, the reflective plate 270 is fixed to the front of the LED panel 260 by an adhesive or bolt.

As described above, the Peltier element 250 and the heat sink 240 are attached to the rear surface of the LED panel 260, and the auxiliary cooling fan 213 is attached to the frame 210 while the reflective plate 270 is attached to the front surface of the LED panel 260. After inserting the fan mounting frame 220 in the interior of the frame 210 is coupled to the bolt.

Then, the cooling fan 230 is bolted to each fan hole 221 of the frame for attaching the fan 220, and then, the Peltier element 250 and the heat sink 240 are framed with the LED panel 260 attached to the rear. Bolt to 210. At this time, the LED 269 and the reflector 270 of the LED panel 260 is located in the front.

Thereafter, the first transparent glass 280, the prism sheet 290, the protective sheet 300, and the second transparent glass 310 are positioned on the front surface of the reflecting plate 270, and then the fixing frame 320 is placed. Fix the bolt to the front of the frame 210.

When the installation is completed as described above and the user selects the brightness of the LED 269 of the LED panel 260 by operating a button of the keypad 334, the central processing unit 336 is connected to the preset logic. Accordingly, the brightness is adjusted by varying the amount of voltage applied to the LED 269, and the brightness is numerically displayed and displayed on the display 335.

In addition, the CPU 336 checks the temperature of the LED panel 260 input from the temperature sensor 332 during operation, and stores pre-stored logic (rotational speed of the cooling fan and cooling time of the Peltier device according to the temperature). As a result, the driver 338 is controlled to drive the cooling fan 230 and the Peltier element 250 to cool the LED panel 260.

In the cooling state, the central processing unit 336 continuously checks the temperature of the LED panel 260 input from the temperature sensor 332 and relays when the LED panel 260 generates heat above a predetermined temperature. Operation 337 opens the power supply of the power supply means 331.

On the other hand, the thermostat 339 senses the temperature of the LED panel 260 separately from the control of the central processing unit 336 and the power supply means 331 when the heat generation amount of the LED panel 260 exceeds a predetermined heat generation amount ).

Therefore, by using the LED as a light source and using a Peltier element to cool the LED, the LED can be effectively cooled to extend the life of the LED.

According to the LED backlight for the LCD test apparatus of the present invention configured as described above, by using a high-brightness LED having a semi-permanent life as a light source, and cooling the LED using a Peltier element and a cooling fan to increase the brightness, easy maintenance As a result, the power consumption can be relatively lowered.

As those skilled in the art would realize, the described embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

Claims (10)

A frame having a rectangular shape and having a front and rear surface open and a plurality of fan holes formed at a side thereof to which an auxiliary cooling fan is attached to each fan hole, and handles formed at both left and right sides thereof; A fan attachment frame formed in a plate shape and having a plurality of fan holes formed on the inner rear surface of the frame; An aluminum plate, a first insulating film coated on the entire surface of the plate with a ceramic material, a metal pattern patterned on the upper surface of the first insulating film, and a coating material coated on the entire surface of the metal pattern with a transparent material and the mounting portion is etched. An LED panel comprising an insulating film and the plurality of LEDs mounted to be electrically connected to the metal pattern; A heat sink attached to a rear surface of the LED panel; A plurality of cooling fans attached to the rear surface of the heat sink to correspond to the fan holes of the fan attachment frame; It is formed in the shape of a square plate and has a cooling surface and a heat generating surface on both sides, the cooling surface is fixed to the LED panel by heat conductive grease, and the heat generating surface is attached to the heat sink by heat conductive grease to fix the LED panel Peltier element to cool; A fixing frame formed in a rectangular ring shape to fix the LED panel and the heat sink to the frame, and fixed to the front of the frame; And LED backlight for the LED test device, characterized in that it comprises a power control unit for controlling the power supply to the cooling fan and the Peltier device. delete delete delete The method of claim 1, The LED panel, LED backlight for an LCD test apparatus, characterized in that the reflecting plate for reflecting the light of the LED is further attached to the front. The method according to claim 1 or 5, Between the reflecting plate of the LED panel and the fixing frame, A first transparent glass; A prism sheet positioned on the front surface of the first transparent glass to improve the straightness of the light of the LED; A protective sheet positioned on the front surface of the prism sheet; And LED backlight for an LCD test apparatus, characterized in that the second transparent glass is further provided for pressing and fixing the protective sheet and the prism sheet to the first transparent glass. delete delete The method of claim 1, The power control unit, Power supply means for receiving commercial power to supply necessary power to each component; A temperature sensor installed at one side of the LED panel to detect a temperature of the LED panel; An A / D converter for converting a sensing signal sensed by the temperature sensor into a digital signal; A keypad for adjusting the brightness of the LED panel according to a user's button setting; A display for numerically displaying the brightness of the LED panel according to external control; Cooling the LED panel by controlling the cooling fan and the Peltier element according to pre-stored logic using the temperature signal input from the A / D converter, and the LED panel is above the preset temperature even when cooling is performed. A central processing unit for outputting a power cutoff signal when the heat is generated and controlling brightness of the LED panel according to an input of the keypad; A relay installed on a line of the power supply means to cut off input power to which a power cutoff signal is input from the central processing unit; And And a driver installed between the central processing unit and the Peltier element, the central processing unit and the cooling fan, and the central processing unit and the LED panel, respectively, and outputting a driving signal under the control of the central processing unit. LED backlight for LCD test device. The method of claim 9, The power control unit, It is provided on one side of the LED panel, and is provided on the line of the power supply means further comprises a thermostat for mechanically blocking the power of the power supply means when the heat generation amount of the LED panel exceeds a predetermined heat generation amount LED backlight for an LCD test device, characterized in that.

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