KR20110054799A - Printed circuit board for inspecting liquid crystal panel and method of inspecting the same - Google Patents

Printed circuit board for inspecting liquid crystal panel and method of inspecting the same Download PDF

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Publication number
KR20110054799A
KR20110054799A KR1020090111578A KR20090111578A KR20110054799A KR 20110054799 A KR20110054799 A KR 20110054799A KR 1020090111578 A KR1020090111578 A KR 1020090111578A KR 20090111578 A KR20090111578 A KR 20090111578A KR 20110054799 A KR20110054799 A KR 20110054799A
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KR
South Korea
Prior art keywords
liquid crystal
crystal panel
temperature sensing
sensing means
inspection
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Application number
KR1020090111578A
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Korean (ko)
Inventor
여인호
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020090111578A priority Critical patent/KR20110054799A/en
Publication of KR20110054799A publication Critical patent/KR20110054799A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1306—Details
    • G02F1/1309—Repairing; Testing
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1313—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells specially adapted for a particular application
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13452—Conductors connecting driver circuitry and terminals of panels

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

PURPOSE: A printed circuit board for liquid crystal panel inspection and inspecting method thereof are provided to increase the reliability of an inspection process and to reduce inspection time of a temperature sensing unit by confirming normal operation of a temperature sensing unit. CONSTITUTION: A temperature sensing unit(126) senses the temperature of a printed circuit board for inspection about a liquid crystal panel. A power supply unit(152) supplies power to the temperature sensing unit. A measuring unit(154) measures the output of the temperature sensing unit by the approval of the power source by using a light emitting diode.

Description

Printed circuit board for inspection of liquid crystal panel and its inspection method {PRINTED CIRCUIT BOARD FOR INSPECTING LIQUID CRYSTAL PANEL AND METHOD OF INSPECTING THE SAME}

The present invention relates to a printed circuit board for inspecting a liquid crystal panel, and in particular, by visually inspecting the operation of the liquid crystal panel using a printed circuit board (PCB) including a light emitting diode (LED). The present invention relates to a printed circuit board for inspecting a liquid crystal panel and a method for inspecting the same, wherein the inspection process for the liquid crystal panel is simplified.

In general, a liquid crystal display (LCD) device forms a liquid crystal layer between electrodes of two opposing substrates and rearranges the liquid crystal molecules of the liquid crystal layer by an electric field generated by applying a voltage to the electrodes. The display device displays an image by changing the transmittance of the liquid crystal layer.

1 is a view showing a conventional liquid crystal display device.

As shown in FIG. 1, the conventional liquid crystal display device 10 includes a liquid crystal panel 20 for displaying an image and a driving unit for supplying various signals and power to the liquid crystal panel 20.

The liquid crystal panel 20 includes first and second substrates 22 and 24 facing each other and spaced apart from each other, and a liquid crystal layer (not shown) formed between the first and second substrates 22 and 24.

Although not illustrated, the first substrate 22 may include a gate wiring and a data wiring crossing each other to define a pixel region, a thin film transistor connected to the gate wiring and a data wiring to serve as a switching element, and a pixel electrode connected to the thin film transistor. The common electrode is formed on the second substrate 24, and the liquid crystal layer is formed between the pixel electrode and the common electrode.

A backlight unit for supplying light to the liquid crystal panel 20 is disposed below the liquid crystal panel 20.

The driving unit includes a gate TCP (tape carrier package) 32 connected to the gate wiring, a gate PCB 30 connected to the gate TCP 32, a data TCP 42 connected to the data wiring, and a data TCP ( A data PCB 44 connected to 42).

The gate TCP 32 and the data TCP 42 are each equipped with a gate driving integrated circuit (IC) 34 and a data driving IC 44.

In order to connect with the driver, the first substrate 22 of the liquid crystal panel 20 is formed to have a larger size than the second substrate 24 and is exposed to the outside of the second substrate 24.

The driver generates a gate signal and a data signal and supplies the gate signal and the data signal to the gate line and the data line, respectively, and the thin film transistor is turned on according to the gate signal to transfer the data signal to the pixel electrode to display an image.

The liquid crystal display device 10 forms an array element such as a gate wiring, a data wiring, a thin film transistor, a pixel electrode, and a common electrode on the first and second substrates 22 and 24, and the first and second substrates ( 22 and 24 are bonded to each other, cut into units of the liquid crystal panel 20, and a liquid crystal layer is formed therebetween, and then the driving unit is connected.

However, since various array elements formed in the liquid crystal panel 20 may not be normally operated due to defects during the process, the liquid crystal panel 20 may be inspected for normal operation before connecting the driving unit after completion of the liquid crystal panel 20. To choose.

In particular, the liquid crystal layer of the liquid crystal panel 20 is sensitive to temperature, so the response speed is slow at a low temperature lower than the reference temperature, and a temperature sensing means for compensating for this may be additionally formed in the liquid crystal panel 20. After the completion of the liquid crystal panel 20 as in the array element, the temperature sensing means is inspected for normal operation.

2 is a view illustrating a conventional liquid crystal panel and an inspection PCB.

As shown in FIG. 2, after the gate TCP and the data TCPs 32 and 42 are connected to the completed liquid crystal panel 20, the test PCB 50 contacts the gate TCP and the data TCPs 32 and 42. By doing so, the liquid crystal panel 20 is inspected for normal operation.

The liquid crystal panel 20 includes first and second substrates 22 and 24 and a liquid crystal layer (not shown) formed therebetween, and a temperature sensing means 26 is formed on the first substrate 22. .

The temperature sensing unit 26 measures the temperature in real time during operation of the liquid crystal display device 10 of FIG. 1 and transmits the temperature to the driving unit, thereby supplying a signal compensated according to the transferred temperature to the liquid crystal panel 20. Play a role.

The inspection PCB 50 contacts the gate TCP and the data TCPs 32 and 42 to check whether the liquid crystal panel 20 is in normal operation, and performs a subsequent process on the liquid crystal panel 20 which is normally operated as a result of the inspection. The liquid crystal display (10 in FIG. 1) is completed by connecting the gate PCB and the data PCB (30 and 40 in FIG. 1) to the gate TCP and data TCPs 32 and 42, respectively.

Here, since the inspection PCB 50 is to be removed again after the inspection, it is temporarily contacted to the gate TCP and data TCP (32, 42) using a probe (probe), and then the gate PCB and data PCB ( 30 and 40 in FIG. 1 are permanently connected to gate TCP and data TCP 32 and 42 using solder or the like.

Therefore, the inspection PCB 50 supplies various inspection signals and inspection power to the liquid crystal panel 20 through the gate TCP and the data TCPs 32 and 42, and measures the output of the liquid crystal panel 20 to provide liquid crystal. The panel is inspected for normal operation. For this purpose, the power supply unit 52 and the measurement unit 54 are formed in the inspection PCB 50.

In particular, a method of inspecting whether the temperature sensing means 26 of the liquid crystal panel 20 operates normally will be described in detail with reference to the accompanying drawings.

3 is a circuit diagram of a temperature sensing means and an inspection PCB of a conventional liquid crystal panel.

As shown in FIG. 3, the temperature sensing means 26 formed on the liquid crystal panel 20 of FIG. 2 is composed of a diode-connected thin film transistor, and the power supply unit and the measurement unit 52 of the inspection PCB (50 of FIG. 2). And 54) each consist of a DC voltage source and a resistor.

That is, when the direct current voltage is supplied from the power supply unit 52, the temperature sensing means 26 is turned on and the current I flows, and a voltage drop occurs in the measurement unit 54 by this current. .

Here, the magnitude of the voltage drop can be measured by contacting a voltmeter 56 such as a multimeter at both ends of the measuring unit 54.

If the temperature sensing means 26 operates normally, the temperature sensing means 26 serves as a resistor having a different value depending on the temperature, and the measuring unit 54 measures a voltage drop having a different value depending on the temperature.

And, if the temperature sensing means 26 does not operate normally, the temperature sensing means 26 has the same effect as the open (open), so that no current flows to the temperature sensing means 26 measuring unit 54 At no voltage drop is measured.

Therefore, it is possible to inspect whether the temperature sensing means 26 of the liquid crystal panel 20 is normally operated by using the inspection PCB 50 including the power supply 52 and the measurement unit 54.

However, there are some disadvantages in the inspection system and inspection method for the temperature sensing means 26 of the liquid crystal panel 20.

First, since the voltmeter 56 is to be contacted with respect to each of the completed liquid crystal panels 20 to check whether it is in a normal operation, there is a disadvantage in that the inspection time becomes long.

In order to solve this problem, the temperature sensing means 26 may be inspected for only a part of the liquid crystal panel 20, but in this case, the temperature sensing means 26 of the liquid crystal panel 20 which has not been inspected may not operate normally. In addition, there is a possibility of a defect, which may reduce the reliability of the completed liquid crystal display.

In addition, when the value of the voltage drop measured by the voltmeter 56 is within a certain range, it may be determined as a normal operation. Since the reference range of the voltage drop may be different depending on the liquid crystal panel 20, the temperature of the liquid crystal panel An error may occur in determining the normal operation of the sensing means 26.

The present invention has been made to solve the above problems, in the inspection printed circuit board and inspection method for the normal operation of the liquid crystal panel, the inspection PCB including the LED is in contact with the liquid crystal panel and the LED blinks By immediately checking whether the temperature sensing means of the liquid crystal panel is normally operated according to whether or not, the inspection time for the temperature sensing means is shortened and the workability of the inspection process is improved. It aims to do it.

In order to achieve the above object, the present invention provides a test printed circuit board for a liquid crystal panel including a temperature sensing means, the power supply unit for supplying power to the temperature sensing means; It provides a liquid crystal panel inspection printed circuit board including a measuring unit for measuring the output of the temperature sensing means by the application of the power using a light emitting diode.

Here, the light emitting diode may be turned on when the temperature sensing means operates normally, and may be turned off when the temperature sensing means operates abnormally.

The measurement unit may include a transistor connected to the light emitting diode to switch a current flowing in the light emitting diode.

In addition, the power supplied by the power supply unit is a first voltage, the output of the temperature sensing means is a second voltage lower than the first voltage, the transistor is on / off controlled according to the second voltage to the LED Can control light emission.

The power supply unit includes a first resistor and a capacitor connected in series between a first power supply voltage and a ground electrode, and one end connected to a node between the first resistor and the capacitor and outputting the first voltage to the other end. And a second resistor, wherein the measuring unit includes third and fourth resistors connected in series between the second voltage and the ground electrode, fifth resistors connected between the fourth resistor and the transistor, and And a sixth resistor, the light emitting diode, the transistor, and a seventh resistor connected in series between the second power supply voltage and the ground electrode.

In addition, the test printed circuit board may be connected to the liquid crystal panel by contacting the gate TCP and the data TCP connected to the liquid crystal panel.

On the other hand, the present invention comprises the steps of contacting the test printed circuit board with the gate TCP and data TCP connected to the liquid crystal panel comprising a temperature sensing means; Supplying power to the temperature sensing means by a power supply unit of the test printed circuit board; It provides a method for inspecting a liquid crystal panel comprising the step of determining whether the temperature sensing means is normal operation on the basis of the blinking of the light emitting diode of the measuring unit of the test printed circuit board.

Here, the light emitting diode may be turned on when the temperature sensing means operates normally, and may be turned off when the temperature sensing means operates abnormally.

The determining of the normal operation of the temperature sensing means may be performed simultaneously with the image inspection step of the liquid crystal panel.

In the printed circuit board and inspection method for inspecting the liquid crystal panel according to the present invention, by contacting the inspection PCB including the LED to the liquid crystal panel and immediately confirms whether or not the temperature sensing means of the liquid crystal panel normal operation according to whether the LED blinks, The inspection time for the temperature sensing means is shortened.

In addition, by performing the inspection on the temperature sensing means at the same time as the image inspection of the liquid crystal panel, the inspection time of the liquid crystal panel is further shortened, and by visually confirming whether the LED blinks, the workability of the inspection process on the temperature sensing means and The reliability of the test results is improved.

In addition, since it is possible to easily determine whether the temperature sensing means operates normally by visually checking whether the LED is blinking, the defect rate of the liquid crystal display device is reduced by performing the inspection of the temperature sensing means for all liquid crystal panels.

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

4 is a block diagram showing a display device showing a liquid crystal panel and a liquid crystal panel inspection PCB according to an embodiment of the present invention.

As shown in FIG. 4, after the gate TCP and data TCPs 132 and 142 are connected to the completed liquid crystal panel 120, the test PCB 150 contacts the gate TCP and data TCPs 132 and 142. The inspection process of the liquid crystal panel 120 is performed.

Subsequently, a gate PCB and a data PCB (not shown) are connected to the gate TCP and the data TCP 132 and 142 of the liquid crystal panel 120 which have passed the inspection process, thereby completing the liquid crystal display device.

The liquid crystal panel 120 includes first and second substrates 122 and 124 and a liquid crystal layer (not shown) formed therebetween, and a temperature sensing means 26 is formed on the first substrate 122. .

Although not shown, the first substrate 122 has a gate wiring and a data wiring crossing each other to define a pixel region, a thin film transistor connected to the gate wiring and a data wiring and serving as a switching element, and a pixel electrode connected to the thin film transistor. The common electrode is formed on the second substrate 124, and the liquid crystal layer is formed between the pixel electrode and the common electrode.

The temperature sensing means 126 is formed at an edge of the first substrate 122 to measure the temperature of the liquid crystal panel 120 in real time during the operation of the liquid crystal display device, thereby providing a timing controller of the gate PCB and the data PCB. By transmitting to (not shown), the timing controller plays a role of supplying a signal compensated according to the transmitted temperature to the liquid crystal panel 120.

The inspection PCB 150 contacts the gate TCP and the data TCPs 132 and 142 to check whether the liquid crystal panel 120 operates normally. After the inspection, the inspection PCB 150 is separated from the gate TCP and the data TCPs 132 and 142.

Therefore, the inspection PCB 150 temporarily contacts the gate TCP and the data TCPs 132 and 142 using a probe and the like, and then the gate PCB and the data PCB are soldered and the like to the gate TCP and data TCP. 132, 142 is permanently connected.

The inspection PCB 150 supplies various inspection signals and inspection power to the liquid crystal panel 120 through the gate TCP and the data TCPs 132 and 142, and measures the output of the liquid crystal panel 120 to measure the output of the liquid crystal panel. In order to check the normal operation, for example, a short or open of the gate wiring and the data wiring of the liquid crystal panel 120 using a black image or a white image displayed by the liquid crystal panel 120 may be used. The defect and the defect of the thin film transistor of the pixel region may be inspected, and a light source may be disposed under the liquid crystal panel 120 for this purpose.

In particular, the inspection PCB 150 uses a power supply unit 152 for supplying power to the liquid crystal panel 120 and an LED in order to inspect whether the temperature sensing means 126 of the liquid crystal panel 120 operates normally. It includes a measuring unit 154 for measuring the output of the temperature sensing means 126 by applying power, which will be described in detail with reference to the drawings.

5 is a circuit diagram of the temperature sensing means and the inspection PCB of the liquid crystal panel according to the embodiment of the present invention.

As shown in FIG. 5, the temperature sensing stage 126 formed in the liquid crystal panel 120 (in FIG. 4) is composed of a diode-connected thin film transistor.

In the drawing, the temperature sensing means 126 including one thin film transistor is illustrated, but in another embodiment, the temperature sensing means 126 may be configured by a plurality of thin film transistors connected in series.

Here, the thin film transistor constituting the temperature sensing means 126 may be formed through the same process as the thin film transistor in the pixel region.

The power supply unit 152 of the inspection PCB (150 of FIG. 4) is configured of a DC voltage source, and the measurement unit 154 of the inspection PCB (150 of FIG. 4) is composed of a transistor (T) and an LED (D).

The power supply unit 152 supplies power to the temperature sensing means 126, and the transistor T is controlled on / off by the output of the temperature sensing means 126 to supply a current flowing in the LED D. Switching, thereby controlling the light emission of the LED (D).

When the first voltage V1 is supplied from the power supply unit (that is, the power supply unit 52), the thin film transistor constituting the temperature sensing unit 126 is turned on so that the current I flows, and the temperature normally operates. The sensing unit 126 acts as a resistor having a different resistance value Rth according to the temperature to generate a voltage drop proportional to the product of the current and the resistance IX Rth, and the measuring unit 154 has a first voltage V1. The second voltage V2 lower than) is supplied.

When the second voltage V2 is applied to the base of the transistor T of the measuring unit 154, the transistor T is turned on and the LED D connected to the transistor T. A current flows through the LED D to emit light.

If the temperature sensing means 126 does not operate normally and is defective, even if the first voltage V1 is applied, the temperature sensing means 126 does not flow a current and has an effect such as disconnection.

As a result, the second voltage V2 is not supplied to the measurement unit 154, and the transistor T of the measurement unit 154 maintains a turn-off state and is connected to the transistor T. No current flows through the LED D, and the LED D does not emit light.

Therefore, the inspector can easily and reliably visually check whether the temperature sensing means 126 of the liquid crystal panel 120 operates normally according to whether the LED D of the measuring unit 154 of the inspection PCB 150 emits light. Since it can be determined, the inspection time for the temperature sensing means 126 can be shortened and the workability of the inspection process and the reliability of the inspection results can be improved.

In addition, since the LED (D) light emission can be easily determined within a short time, the temperature during the image inspection to determine whether the normal operation from the various images displayed on the liquid crystal panel 120 using the inspection PCB 150 Inspection of the sensing means 126 may be performed at the same time.

That is, by mounting the power supply unit 152 and the measurement unit 154 for the inspection of the temperature sensing means on the inspection PCB for image inspection, reducing the PCB manufacturing cost for inspection and shortening the total inspection time of the liquid crystal panel 120 can do.

In addition, since the inspection process is simple, the inspection time is short, and the inspection can be performed simultaneously with the image inspection, the entire inspection can be performed on all the liquid crystal panels 120, thereby improving the defective rate of the final LCD.

An example of the power supply unit and the measurement unit of the liquid crystal panel inspection PCB will be described with reference to the drawings.

6 and 7 are views illustrating a power supply unit and a measurement unit of the liquid crystal panel inspection PCB according to the embodiment of the present invention, respectively.

As shown in FIG. 6, the power supply unit 152 of the liquid crystal panel inspection PCB includes a first power supply voltage VDD1, first and second resistors R1 and R2, and a capacitor C. As shown in FIG.

That is, the first resistor R1 and the capacitor C are connected in series between the first power voltage VDD1 and the ground electrode, and the second resistor V2 is connected between the first resistor R1 and the capacitor C. It is connected to the node of.

Since the first power supply voltage VDD1 supplies a DC voltage, a current flows through the first and second resistors R1 and R2 and a voltage drop is generated by the first and second resistors R1 and R2.

As a result, the first voltage V1 smaller than the first power supply voltage VDD1 is output to one end of the second resistor R2.

As illustrated in FIG. 7, the measurement unit 154 of the liquid crystal panel inspection PCB includes third to seventh resistors R3 to R7, a transistor T, and an LED D.

That is, the third and fourth resistors R3 and R4 are connected in series between the second voltage V3 and the ground electrode, and the sixth resistor R6 and the LED are connected between the second power voltage VDD2 and the ground electrode. (D), the transistor T and the seventh resistor R7 are connected in series.

One end of the fifth resistor R5 is connected to the node between the third and fourth resistors R3 and R4, and the other end of the fifth resistor R5 is connected to the base of the transistor T. The collector and emitter of the transistor T are connected to the LED D and the seventh resistor R7, respectively.

The first voltage V1 output from the power supply unit 152 of FIG. 6 passes through the temperature sensing means (126 of FIG. 4) of the liquid crystal panel 120 of FIG. 4 and is lower than the first voltage V2. V2) to be input to the measuring unit 154.

The current flows through the third and fourth resistors R3 and R4 by the second voltage V2, and a voltage drop occurs according to the voltage division law of the third and fourth resistors R3 and R4.

The voltage dropped by the ratio of the third resistor R3 to the sum of the third and fourth resistors R3 and R4 in the second voltage V2 is applied to the base of the transistor T to turn the transistor on. Turn on.

By the turn-on of the transistor T, a current from the second power source VDD2 flows to the sixth resistor R6, the LED D, the transistor T, and the seventh resistor R7, and the LED ( D) emits light.

As described above, in the liquid crystal panel inspection printed circuit board and the inspection method according to the present invention, the temperature detection means can be inspected by contacting the inspection PCB including the LED to the liquid crystal panel and visually confirming whether the LED is emitted. The inspection time for the temperature sensing means is shortened, and the workability of the inspection process for the temperature sensing means and the reliability of the inspection results are improved.

In addition, since the inspection of the temperature sensing means can be carried out at the same time during the image inspection of the liquid crystal panel, the total inspection time for the liquid crystal panel is shortened, and as a result, the entire temperature sensing means can be inspected for all the liquid crystal panels. The defective rate of the final liquid crystal display device is reduced.

4 to 7 illustrate that the measurement unit including the power supply unit and the LED is used for the inspection of the temperature sensing means of the liquid crystal panel. In another embodiment, the array elements of the liquid crystal panel, for example, the gate wiring and the data, are used. It can also be used for inspection of disconnection of wiring.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

1 is a view showing a conventional liquid crystal display device.

2 is a view showing a conventional liquid crystal panel and inspection PCB.

3 is a circuit diagram of a temperature sensing means and inspection PCB of the conventional liquid crystal panel.

Figure 4 is a block diagram showing a display device showing a liquid crystal panel and a liquid crystal panel inspection PCB according to an embodiment of the present invention.

5 is a circuit diagram of the temperature sensing means and inspection PCB of the liquid crystal panel according to an embodiment of the present invention.

6 is a view showing a power supply unit of the liquid crystal panel inspection PCB according to an embodiment of the present invention.

7 is a view showing a measuring unit of the liquid crystal panel inspection PCB according to an embodiment of the present invention.

Claims (10)

In the test printed circuit board for the liquid crystal panel comprising a temperature sensing means, A power supply unit supplying power to the temperature sensing means; Measuring unit for measuring the output of the temperature sensing means by the application of the power using a light emitting diode Liquid crystal panel inspection printed circuit board comprising a. The method of claim 1, The light emitting diode is turned on when the temperature sensing means operates normally, and is turned off when the temperature sensing means operates abnormally. The method of claim 1, And the measuring unit includes a transistor connected to the light emitting diode to switch a current flowing through the light emitting diode. The method of claim 3, wherein The power supplied by the power supply unit is a first voltage, the output of the temperature sensing means is a second voltage lower than the first voltage, and the transistor is controlled on / off according to the second voltage to emit light of the LED. Printed circuit board for controlling the liquid crystal panel. The method of claim 4, wherein The power supply unit includes a first resistor and a capacitor connected in series between a first power supply voltage and a ground electrode, and a second resistor having one end connected to a node between the first resistor and the capacitor and outputting the first voltage to the other end. Liquid crystal panel inspection printed circuit board comprising a. The method of claim 4, wherein The measuring unit includes third and fourth resistors connected in series between the second voltage and the ground electrode, a fifth resistor connected between the fourth resistor and the transistor, and between the second power voltage and the ground electrode. 6. A printed circuit board for inspecting a liquid crystal panel comprising a sixth resistor, the light emitting diode, the transistor, and a seventh resistor connected in series. The method of claim 1, The inspection printed circuit board is a liquid crystal panel inspection printed circuit board connected to the liquid crystal panel in contact with the gate TCP and data TCP connected to the liquid crystal panel. Contacting the test printed circuit board with a gate TCP and data TCP connected to a liquid crystal panel including a temperature sensing means; Supplying power to the temperature sensing means by a power supply unit of the test printed circuit board; Determining whether the temperature sensing means operates normally based on the blinking of the light emitting diode of the measuring unit of the test printed circuit board. Inspection method of the liquid crystal panel comprising a. The method of claim 8, And the light emitting diode is turned on when the temperature sensing means operates normally, and is turned off when the temperature sensing means operates abnormally. The method of claim 9, The determining of the normal operation of the temperature sensing means, the liquid crystal panel inspection method performed at the same time as the image inspection step of the liquid crystal panel.
KR1020090111578A 2009-11-18 2009-11-18 Printed circuit board for inspecting liquid crystal panel and method of inspecting the same KR20110054799A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170064170A (en) * 2015-11-30 2017-06-09 엘지디스플레이 주식회사 Display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170064170A (en) * 2015-11-30 2017-06-09 엘지디스플레이 주식회사 Display device

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