JP2003057678A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which the short-circuit address of a common capacitance line can not be identified and repaired during a collective image inspection prior to packaging FPCs and ICs when a short-circuit is generated between a source line and the common capacitance line caused by abnormality in the production processes of a liquid crystal display device having the common capacitance lines and opposing electrodes that are in a same potential. SOLUTION: In a panel condition in which FPCs and ICs do not have been packaged, the short-circuited part address of the source line and the common capacitance line is identified by driving the common capacitance line and the opposing electrode as different potential. Having packaged the FPCs and ICs, the common capacitance line and the opposing electrode are connected and driven by a single signal. Thus, the driving circuit cost is not increased and a superior liquid crystal display device is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a liquid layer display device having a common capacitance line for forming a storage capacitance and having a structure in which a flexible printed circuit and / or an IC is mounted on a glass substrate. The present invention relates to a liquid crystal display device manufacturing method, an image display inspection method for performing an image display inspection of a liquid crystal display device, an information processing device, a television receiving device, and a wireless communication device.

[0002]

2. Description of the Related Art In a conventional liquid crystal display device, a common line for forming a storage capacitor and a counter electrode are TFTs in a panel state before mounting a flexible printed circuit or a driving IC.
The structure is such that they are electrically connected within the array substrate.

FIG. 3 shows a circuit diagram in a panel of a conventional liquid crystal display device. The gate line 1 is collectively connected to the inspection gate signal terminal 3 through the inspection resistor 5 at the gate end, and the source line 1 is collectively connected to the inspection source signal terminal 4 through the inspection resistor 6 at the source end. Connected. TF
The common capacitance line 7 and the counter electrode 8 on the T array substrate are electrically connected on the array substrate and have the same potential. The common capacitance line 7 and the counter electrode 8 connected on the array substrate are taken out from the flexible printed circuit board 18 to the external circuit via the common terminal 17.

Next, the operation of such a conventional liquid crystal display device will be described.

When manufacturing a liquid crystal display device in a factory, an image display inspection is performed in a panel state before the flexible printed circuit 18 and the drive IC are mounted on the liquid crystal display device. The flexible printed circuit 1 is attached to the liquid crystal display device in the panel state which is determined to be normal as a result of the image display inspection.
8 and a driving IC are mounted.

Such an image display device operates as follows. That is, image display is performed by applying a gate signal for inspection, a source signal for inspection, and a reference voltage for inspection to the inspection gate signal terminal 3, the inspection source signal terminal 4, and the common terminal 17, respectively. , Check if each pixel is normal.

Further, when the liquid crystal display device is shipped as a product, it is used for the above image display inspection such as the inspection gate signal terminal 3, the inspection resistor 5, the inspection source signal terminal 4 and the inspection resistor 6. The cut circuit portion is removed from the liquid crystal display device by cutting with a laser or the like.

[0008]

However, in the above-mentioned conventional configuration, signals are input from the inspection gate signal terminal 3, the inspection source signal terminal 4, and the common terminal 17 before mounting the flexible printed circuit board or the driving IC. Then, when the image display inspection was performed, the source line 2 on the TFT array substrate
The line defect position in the source line direction is easily visible on the display at the location 9 where the short circuit between the common capacitance line 7 and the common capacitance line 7 occurs.
The line defect position in the gate line direction cannot be specified on the display. Therefore, even if the image display inspection is performed, it is impossible to identify the address of the short-circuited portion 9, and there is a problem that the repair cannot be performed.

Normally, a voltage of about 3 V is applied between the source line 2 and the common terminal, and the source signal is about 10 k-1.
The common signal in the gate direction is input via the inspection resistance 6 of 00 kΩ, and is input via the wiring resistance of the common capacitance line 7 of 1 kΩ or less. When the short-circuited portion 9 occurs, the source signal and the common signal in the gate direction are divided by the resistance ratio in the source direction and the gate direction, and a voltage drop occurs, which appears as a display line defect, but the resistance ratio is several tens of times or more. Then, the line defect in the gate direction having a small resistance value cannot be seen on the display, and the address cannot be specified.

That is, in the conventional liquid crystal display device, even if an image display inspection is performed before mounting the flexible printed circuit board or the driving IC, the line defect in the gate direction cannot be seen on the display, and therefore it is common to the source line. There is a problem that it is not possible to identify the location where a short circuit has occurred with the capacitance line.

The present invention has been made in consideration of the above-mentioned problems of the prior art.
A liquid crystal display device and a liquid crystal display device manufacturing method capable of repairing, by devising the wiring on the T array substrate and enabling the address specification of the short-circuited portion 9 in the image display inspection before mounting the flexible printed circuit board or the driving IC, An object is to provide an image display inspection method, an information processing device, a television receiving device, and a wireless communication device.

[0012]

In order to solve the above-mentioned problems, the first invention (corresponding to claim 1) is for forming a storage capacitor formed in the gate line direction on a TFT array substrate. Common capacitance line and a counter electrode formed on the TFT array substrate, and the common capacitance line and the counter electrode are electrically separated on the TFT array substrate, and a flexible printed circuit is provided. Or source IC
Alternatively, the liquid crystal display device is electrically short-circuited by the gate IC.

A second aspect of the present invention (corresponding to claim 2)
Comprises a common capacitance line mounting terminal electrically connected to the common capacitance line, and a counter electrode mounting terminal electrically connected to the counter electrode, wherein the common capacitor mounting terminal and the counter electrode are: Separately formed on the TFT array substrate, the common capacitor mounting terminal and the counter electrode mounting terminal are the flexible printed circuit or the source IC.
Alternatively, the liquid crystal display device according to the first aspect of the present invention is connected by the internal wiring of the gate IC, and the internal wiring is connected to a common terminal for connecting to the outside.

A third aspect of the present invention (corresponding to claim 3)
Is a liquid crystal display device manufacturing method for manufacturing the liquid crystal display device according to the first or second aspect of the present invention, wherein the T capacitor is electrically isolated from the common capacitance line and the counter electrode.
A liquid crystal display device which is formed on an FT array substrate, and after the flexible printed circuit, the source IC or the gate IC is mounted, the common capacitance line and the counter electrode are electrically short-circuited by the flexible printed circuit, the source IC or the gate IC. Is a manufacturing method.

A fourth invention (corresponding to claim 4)
Is an image display inspection method for performing an image display inspection of the liquid crystal display device according to the first or second aspect of the present invention before mounting the flexible printed circuit or the source IC or the gate IC. A predetermined liquid crystal drive voltage is applied to the potential of the counter electrode, a voltage higher than the predetermined liquid crystal drive voltage to the potential of the source line is applied to the common capacitance line, and the liquid crystal display device is operated in the gate direction. By specifying the line defect position and the line defect position in the source direction, the location where the source line and the common capacitance line of the liquid crystal display device are short-circuited is specified, and the voltage higher than the predetermined liquid crystal drive voltage is: In the image display inspection method, the voltage is such that the line defect position in the gate direction can be confirmed when the source line and the common capacitance line are short-circuited.

The fifth invention (corresponding to claim 5)
Includes information processing means for processing information and display means for displaying the processed information or the processed information, and the display means is the liquid crystal display device according to the first or second aspect of the present invention. This is an information processing device used.

A sixth aspect of the present invention (corresponding to claim 6)
Comprises a receiving means for receiving a broadcast wave and outputting a demodulated signal, and a display means for displaying the demodulated signal,
The display means is a television receiver using the liquid crystal display device according to the first or second aspect of the present invention.

A seventh aspect of the present invention (corresponding to claim 7)
Includes a communication unit for performing wireless communication and a display unit for displaying a GUI for controlling the wireless communication unit, and the liquid crystal display device according to the first or second aspect of the present invention is used as the display unit. Wireless communication device.

For example, in order to achieve the above-mentioned object, the liquid crystal display device of the present invention, as an example, electrically connects the common capacitance line 7 and the counter electrode 8 on the TFT array substrate before mounting the flexible printed circuit board or the driving IC. By inputting inspection signals of different potentials in the image display inspection, it is possible to identify the address of the short-circuited portion 9 by using the drive in which the line defect position in the gate line direction is easily visible on the display. Become.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a circuit diagram in a panel of a liquid crystal display device according to Embodiment 1 of the present invention. The liquid crystal display device of the present embodiment includes a gate line 1, a source line 2, a gate collective inspection line 3, a source collective inspection line 4, a collective inspection gate line input resistor 5, a collective inspection source line input resistor 6, and a common capacitance line 7. , A counter electrode 8, a short circuit between the source line 2 and the common capacitance line 7, a pixel TFT 10, a storage capacitor 11,
Liquid crystal capacitor 12, gate mounting terminal 13, source mounting terminal 1
4, common capacitance line mounting terminal 15, counter electrode mounting terminal 16,
It is composed of a common capacitance line and a common line 17 of a counter electrode, a flexible printed circuit board 18, and a flexible printed circuit wiring 19.

The gate line 1 is a gate IC (not shown).
Is a line which is driven by and applies a gate signal for turning on / off the pixel TFT 10 to each pixel TFT 10.

The source line 2 is a source IC (not shown).
A line for applying a source signal to the liquid crystal capacitor 12 and the storage capacitor 11 of a pixel driven by the selected TFT 10 and being in an ON state.

The gate collective inspection line 3 and the source collective inspection line 4 collectively apply an inspection gate signal to the gate line 1 when an image display inspection is performed before mounting the flexible printed circuit board 18, This is a line for collectively applying a source signal for inspection to the source line 2, and is removed by burning off with a laser or the like before shipping as a product.

The counter electrode 8 is an electrode for applying a signal voltage to the liquid crystal layer together with a pixel electrode (not shown) formed in each pixel.

The pixel TFT 10 is a switching element which is formed for each pixel and turns on / off between the source line 2 and the pixel electrode by a gate signal applied from the gate line 1.

The storage capacitor 11 is a capacitor that assists the liquid crystal capacitor 12 so that a signal voltage can be continuously applied to the liquid crystal layer until the next scanning period.

The liquid crystal capacitor 12 is a capacitor formed between the pixel electrode and the counter electrode 8.

The gate mounting terminal 13 is a terminal which is connected to the gate IC and supplies a gate signal from the gate IC.

The source mounting terminal 14 is a terminal which is connected to the source IC and supplies a source signal from the source IC.

The gate line 1 is collectively connected to the inspection gate signal terminal 3 via the inspection resistor 5 at the gate end, and the source line 1 is connected to the inspection source signal terminal 4 via the inspection resistor 6 at the source end. Are connected to all at once.

The common capacitance line 7 and the counter electrode 8 on the TFT array substrate are electrically separated on the array substrate and have different potentials. Common capacitance line mounting terminal 15, counter electrode mounting terminal 1
6 is provided on the array substrate in a separated state. The internal wiring 19 of the flexible printed circuit board 18 connects the common capacitance line mounting terminal 15 and the counter electrode mounting terminal 16 and is taken out to the external circuit by one common terminal 17.

Therefore, the common capacitance line 7 and the counter electrode 8 are
A structure in which the flexible printed circuit board 18 is electrically separated before being mounted, and the common capacitance line 7 and the counter electrode 8 are electrically short-circuited after the flexible printed circuit board 18 is mounted. Have.

Next, the operation of this embodiment will be described.

The liquid crystal display device of this embodiment is based on the results of experiments conducted by the inventor. Therefore, first,
The experiment conducted by the inventor will be described, and then the liquid crystal display device of the present embodiment will be described.

First, the inventor manufactured a part of the liquid crystal display device of FIG. 1 other than the flexible printed circuit board 18. That is, as shown in FIG. 1, the counter electrode 8 and the common capacitance line 7 are formed separately. Further, by irradiating a laser, the source line 2 and the common capacitance line 7 were short-circuited to form a short-circuited portion 9.

Next, such a liquid crystal display device was made to perform a display operation. That is, 0V voltage is applied to the counter electrode mounting terminal 16, and 2V voltage is applied to the source mounting terminal 2.
A voltage of 20V was applied to the common capacitor mounting terminal 16, and a voltage of 15V was applied to the gate mounting terminal 13.

Then, the liquid crystal display device is brought into a display state, a line defect passing through the short-circuited portion 9 and parallel to the source line direction is displayed, and a line defect passing through the short-circuited portion 9 and parallel to the gate line direction. Was displayed.

In this way, when the above voltage is applied to each terminal of the liquid crystal display device, if there is a short-circuited portion 9, a horizontal line defect passing through the short-circuited portion 9 and a vertical line defect. A line defect was displayed.

It can be confirmed by the conventional liquid crystal display device that the line defect in the source line direction is displayed through the shorted part 9, but the line defect in the gate line direction is displayed through the shorted part 9. This has not been confirmed in the conventional liquid crystal display device.

The reason why such a line defect in the gate direction is displayed can be estimated as follows. That is, since each common capacitance line 7 has a resistance of about 1 KΩ, the voltage drop of the common capacitance line 7 connected to the short-circuited portion 9 is the same as that of the other common capacitance line 7. Get bigger. From this, it can be inferred that line defects in the gate line direction are displayed.

However, among the pixels connected to the common capacitance line 7 connected to the short-circuited portion 9, except for the pixels corresponding to the short-circuited portion 9, the common capacitance line 7 is connected to the counter electrode 8. Are in an insulating state and are not electrically connected to the pixel electrode, therefore, even if a voltage drop occurs in the common capacitance line 7, the voltage between the pixel electrode and the counter electrode does not change, and It seems unlikely that line defects in the gate line direction will be displayed.

However, actually, the timing of applying a voltage to the counter electrode mounting terminal 16, the source mounting terminal 2, the common capacitance mounting terminal 16, and the gate mounting terminal 13, the pixel electrode, the counter electrode 8, the common capacitance line 7, and the like. It can be presumed that such a phenomenon occurs due to complicated factors such as movement of charges due to the structural positional relationship.

Next, the image display inspection based on the above facts will be described.

That is, when the image display inspection is performed before mounting the flexible printed circuit board or the driving IC with the above-described configuration, the source signal is applied with a liquid crystal driving voltage of about 2 V with respect to the opposite potential, and the common capacitance line is applied. Is the number 1 for the source
A voltage of 0V is applied. By doing so, it becomes possible to apply and display a voltage which is ten times the counter-source voltage between the source line and the common capacitance line, and the source line 2 and the common capacitance line on the TFT array substrate can be displayed. In the location 9 where 7 is short-circuited, the voltage drop with respect to the other line of the defect generation line is more than ten times that of the conventional liquid crystal display device in both the gate line direction and the source line direction, and the defect address can be specified by the display. Repair is possible.

Further, by mounting the common capacitance line mounting terminal 15 and the counter electrode mounting terminal 16 after mounting on the flexible printed circuit board and outputting them to the external circuit as one common terminal 17, the cost burden on the external circuit does not increase. .

As described above, according to the present invention, the source-common capacitance line short-circuited portion can be detected by the image display inspection before mounting the flexible printed circuit board or the driving IC without giving a cost burden to the external circuit. A liquid crystal display device can be realized.

The liquid crystal display device of the present invention may be the liquid crystal display device before the flexible printed circuit board of this embodiment is mounted, or the liquid crystal display after the flexible printed circuit board is mounted. It may be a device.

Further, the flexible printed circuit board of this embodiment is an example of the flexible printed circuit of the present invention.

(Second Embodiment) FIG. 2 is a circuit diagram in a panel of a liquid crystal display device according to a second embodiment of the present invention.
In the first embodiment, the flexible printed circuit board 18
The common capacitance line mounting terminal 15 and the counter electrode mounting terminal 16 are connected to each other by the internal wiring 19 of the common wiring 1
However, instead of mounting the source IC by the internal wiring 21 of the source IC 20, the common capacitance line mounting terminal 15 and the counter electrode mounting terminal 16 are connected and output to the outside as the common terminal 17. The same effect as the first embodiment of the invention can be obtained.

Further, instead of the source IC, the internal wiring of the gate IC is used.
It is also possible to connect 5 and the counter electrode mounting terminal 16.

In the method of manufacturing a liquid crystal display device according to the present invention, the common capacitance line and the counter electrode are electrically connected to each other before mounting the flexible printed circuit or the source IC or the gate IC. The present invention also relates to a method of manufacturing a liquid crystal display device in which the common capacitance line and the counter electrode are electrically short-circuited after the flexible printed circuit or the source IC or the gate IC is mounted.

Further, an information processing means for processing information,
An information processing apparatus, which comprises a display unit for displaying the processed information or the processed information, and in which the liquid crystal display device of the present invention is used for the display unit, also belongs to the present invention. The information processing device of the present invention includes a personal computer, PDA, and the like. In short, the information processing device of the present invention is a device for displaying information on the display, and it is sufficient that the liquid crystal display device of the present invention is used for the display.

Further, the liquid crystal display device of the present invention is provided with receiving means for receiving a broadcast wave and outputting a demodulated signal, and display means for displaying the demodulated signal. A television receiver that is also included in the present invention.

Further, it is provided with a communication means for performing wireless communication and a display means for displaying a GUI for controlling the wireless communication means, and the display means is a wireless communication using the liquid crystal display device of the present invention. The device also belongs to the present invention. In addition,
The wireless communication device of the present invention includes a device that wirelessly communicates, such as a mobile phone terminal, a PHS terminal, and a car phone terminal.

[0056]

As described above, according to the present invention, a short portion due to a defect during the process of the intersection of the source line and the common capacitance line for forming the storage capacitance is flexible without increasing the manufacturing cost of the liquid crystal display device. Printed circuit board and drive I
C It is possible to realize an excellent liquid crystal display device, a liquid crystal display device manufacturing method, an image display inspection method, an information processing device, a television receiving device, and a wireless communication device, which can address and repair in an image display inspection before mounting.

[Brief description of drawings]

FIG. 1 is a circuit diagram in a panel of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram in a panel of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 3 is a circuit diagram in a panel of a liquid crystal display device in a conventional liquid crystal display device.

[Explanation of symbols]

1 gate line 2 source line 3 gate batch inspection line 4 Source batch inspection line 5 Collective inspection gate line input resistance 6 Batch inspection source line input resistance 7 Common capacitance line 8 Counter electrode 9 Source line and common capacitance line short 10 pixel TFT 11 Storage capacity 12 Liquid crystal capacity 13 Gate mounting terminal 14 Source mounting terminal 15 Common capacitance line mounting terminal 16 Counter electrode mounting terminal 17 Common line of common capacitance line and counter electrode 18 Flexible printed circuit board 19 Flexible printed circuit wiring 20 Source IC 21 Source IC wiring

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09F 9/00 352 G09F 9/00 352 9/30 338 9/30 338 9/35 9/35 F term ( Reference) 2H092 GA50 JA24 JB22 JB31 JB69 JB77 JB79 MA47 NA14 NA15 NA16 NA29 PA06 5C094 AA42 AA43 BA03 BA43 CA19 DA09 DA12 DA13 DB02 DB05 DB10 EA03 EA07 EA10 FA01 GB10 HA08 EE10 KK EEEE BB37EE10 BB12EE37 BB12 CC37 CC094

Claims (7)

[Claims] 1. A common capacitance line for forming a storage capacitance, which is formed on the TFT array substrate in the gate line direction, and a counter electrode formed on the TFT array substrate, wherein the common capacitance line and the common capacitance line are provided. A liquid crystal display device which is electrically separated from the counter electrode on the TFT array substrate and electrically short-circuited by a flexible printed circuit, a source IC or a gate IC. 2. A common capacitance line mounting terminal electrically connected to the common capacitance line, and a counter electrode mounting terminal electrically connected to the counter electrode, wherein the common capacitor mounting terminal and the counter electrode are provided. Is the TFT
Separately formed on the array substrate, the common capacitance mounting terminal and the counter electrode mounting terminal are connected by an internal wiring of the flexible printed circuit or the source IC or the gate IC, and the internal wiring is connected to the outside. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is connected to a common terminal for connection. 3. A method of manufacturing a liquid crystal display device according to claim 1, wherein the common capacitance line and the counter electrode are electrically separated from each other on the TFT array substrate. A method for manufacturing a liquid crystal display device, wherein the common capacitance line and the counter electrode are electrically short-circuited by the flexible printed circuit, the source IC or the gate IC after being mounted on the flexible printed circuit, the source IC or the gate IC. 4. An image display inspection method for performing an image display inspection of the liquid crystal display device according to claim 1 before mounting the flexible printed circuit, the source IC or the gate IC, wherein the source line of the liquid crystal display device is inspected. A predetermined liquid crystal drive voltage is applied to the potential of the counter electrode, a voltage higher than the predetermined liquid crystal drive voltage to the potential of the source line is applied to the common capacitance line, and a voltage in the gate direction of the liquid crystal display device is applied. By specifying the line defect position and the line defect position in the source direction, the location where the source line and the common capacitance line of the liquid crystal display device are short-circuited is specified, and the voltage higher than the predetermined liquid crystal drive voltage is An image display inspection method in which the voltage is such that a line defect position in the gate direction can be confirmed when the source line and the common capacitance line are short-circuited. 5. The liquid crystal display device according to claim 1, further comprising: information processing means for processing information, and display means for displaying the processed information or the processed information. An information processing device in which is used. 6. The liquid crystal display according to claim 1, further comprising: a receiving unit that receives a broadcast wave and outputs a demodulated signal, and a display unit that displays the demodulated signal. The television receiver for which the device is used. 7. The liquid crystal display device according to claim 1, further comprising a communication unit for performing wireless communication and a display unit for displaying a GUI for controlling the wireless communication unit. Wireless communication device.