JP4225713B2 - Image display inspection method and liquid crystal display device manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention has a common capacitance line for the storage capacitor forming, the liquid crystal display device manufacturing method for manufacturing a liquid crystal display device that have a configuration that implements a flexible printed circuit and / or IC on a glass substrate and, those related to the image display inspection how to perform image display inspection of a liquid crystal display device.
[0002]
[Prior art]
In a conventional liquid crystal display device, a common line for forming a storage capacitor and a counter electrode are electrically connected in a TFT array substrate in a panel state before mounting a flexible printed circuit or a driving IC. It was.
[0003]
FIG. 3 shows an in-panel circuit diagram of a conventional liquid crystal display device. The gate line 1 is collectively connected to the inspection gate signal terminal 3 via the inspection resistor 5 at the gate termination, and the source line 2 is collectively connected to the inspection source signal terminal 4 via the inspection resistor 6 at the source termination. Connected. The common capacitance line 7 and the counter electrode 8 on the TFT 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.
[0004]
Next, the operation of such a conventional liquid crystal display device will be described.
[0005]
When a liquid crystal display device is manufactured at a factory, an image display inspection is performed in a panel state before the flexible printed circuit 18 and the driving IC are mounted on the liquid crystal display device. A flexible printed circuit 18, a driving IC, and the like are mounted on the liquid crystal display device in the panel state that is determined to be normal as a result of the image display inspection.
[0006]
The inspection of such an image display device is performed as follows. That is, an image is displayed by applying an inspection gate signal, an inspection source signal, and an inspection reference voltage to the inspection gate signal terminal 3, the inspection source signal terminal 4, and the common terminal 17, respectively. Inspect whether each pixel is normal.
[0007]
In addition, when the liquid crystal display device is shipped as a product, the circuit used for the above-mentioned 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 portion is removed from the liquid crystal display device by cutting with a laser or the like.
[0008]
[Problems to be solved by the invention]
However, in the above-described configuration of the conventional example, when the image is inspected by inputting signals 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. In addition, at the portion 9 where the short circuit between the source line 2 and the common capacitance line 7 on the TFT array substrate occurs, the line defect position in the source line direction is easy to see on the display, but the line defect position in the gate line direction is on the display. It can not be identified. Therefore, even if the image display inspection is performed, it is impossible to specify the address of the shorted portion 9 and repair cannot be performed.
[0009]
Usually, a voltage of about 3 V is applied between the source line 2 and the common terminal, the source signal is input through the inspection resistor 6 of about 10 k to 100 kΩ, and the common signal in the gate direction is the common capacitor line 7. It is input via a wiring resistance of 1 kΩ or less. When the shorted 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.
[0010]
That is, in a conventional liquid crystal display device, even if an image display inspection is performed before mounting a flexible printed circuit board or a driving IC, a line defect in the gate direction cannot be seen on the display. There is a problem that it is not possible to specify the location where a short circuit has occurred.
[0011]
In consideration of the above-described conventional problems, the present invention devise wiring on the TFT array substrate, and can specify the address of the shorted portion 9 in the image display inspection before mounting the flexible printed circuit board or the driving IC, and can be repaired. manufacturing method of a liquid crystal display device according to the, and an object of the present invention to provide an image display test how.
[0012]
[Means for Solving the Problems ]
[0015]
To solve the above problems, the first of the onset Akira,
A common capacitor line for forming a storage capacitor formed in a gate line direction on the TFT array substrate; and a counter electrode. The common capacitor line and the counter electrode are electrically on the TFT array substrate. An image display inspection method for performing an image display inspection of a liquid crystal display device that is separated and electrically short-circuited by a flexible printed circuit, a source IC, or a gate IC before mounting the flexible printed circuit, the source IC, or the gate IC. And
Applying a predetermined liquid crystal driving voltage to the source line of the liquid crystal display device with respect to the potential of the counter electrode,
Applying a voltage higher than the predetermined liquid crystal driving voltage with respect to the potential of the source line to the common capacitance line,
By identifying the line defect position in the gate direction and the line defect position in the source direction of the liquid crystal display device, the location where the source line and the common capacitance line of the liquid crystal display device are short-circuited,
In the image display inspection method, the voltage higher than the predetermined liquid crystal driving voltage is a voltage at which a line defect position in the gate direction can be confirmed when the source line and the common capacitor line are short-circuited.
The second aspect of the present invention
A common capacitor line for forming a storage capacitor formed in the gate line direction on the TFT array substrate, a common capacitor line mounting terminal electrically connected to the common capacitor line, a counter electrode, and an electric power to the counter electrode The common capacitor line and the counter electrode are electrically separated on the TFT array substrate, and the common capacitor line mount terminal and the counter electrode mounting are connected to each other. The terminal is formed separately on the TFT array substrate, and the common capacitor line mounting terminal and the counter electrode mounting terminal are connected by an internal wiring of a flexible printed circuit or a source IC or a gate IC. For the internal wiring, the flexible printed circuit or the source IC or the gate is used for the image display inspection of the liquid crystal display device connected to the common terminal for connecting to the outside. An image display inspection method performed before C implementation,
Applying a predetermined liquid crystal driving voltage to the source line of the liquid crystal display device with respect to the potential of the counter electrode,
Applying a voltage higher than the predetermined liquid crystal driving voltage with respect to the potential of the source line to the common capacitance line,
By identifying the line defect position in the gate direction and the line defect position in the source direction of the liquid crystal display device, the location where the source line and the common capacitance line of the liquid crystal display device are short-circuited,
In the image display inspection method, the voltage higher than the predetermined liquid crystal driving voltage is a voltage at which a line defect position in the gate direction can be confirmed when the source line and the common capacitor line are short-circuited.
The third aspect of the present invention
Forming the common capacitance line on the TFT array substrate so as to be electrically separated from the counter electrode;
Before mounting the flexible printed circuit or source IC or gate IC, perform image display inspection using the image display inspection method of the first or second aspect of the present invention,
In the method of manufacturing a liquid crystal display device, 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 the flexible printed circuit, the source IC, or the gate IC is mounted.
[0019]
For example, in order to achieve the above object, the image display inspection method of the liquid crystal display device of the present invention is, for example, 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. electrically separating, by input test signals of different potential in the image display inspection, line defect position of the gate line direction displayed on visible and easier, and enables the address specified location 9 shorted .
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
(Embodiment 1)
FIG. 1 shows an in-panel circuit diagram of the liquid crystal display device according to Embodiment 1 of the present invention. The liquid crystal display device of this embodiment includes a gate line 1, a source line 2, a gate batch inspection line 3, a source batch inspection line 4, a batch inspection gate line input resistor 5, a batch inspection source line input resistor 6, and a common capacitance line 7. , Counter electrode 8, shorted portion 9 of source line 2 and common capacitor line 7, pixel TFT 10, holding capacitor 11, liquid crystal capacitor 12, gate mounting terminal 13, source mounting terminal 14, common capacitor line mounting terminal 15, counter electrode mounting terminal 16, a common capacitance line and a common electrode 17 of the counter electrode, a flexible printed circuit board 18, and a flexible printed circuit wiring 19.
[0022]
The gate line 1 is driven by a gate IC (not shown) and applies a gate signal for turning on / off the pixel TFT 10 to each pixel TFT 10.
[0023]
The source line 2 is a line that is driven by a source IC (not shown) and applies a source signal to the liquid crystal capacitor 12 and the storage capacitor 11 of the pixel in which the selected TFT 10 is turned on.
[0024]
The gate collective inspection line 3 and the source collective inspection line 4 collectively apply gate signals for inspection to the gate lines 1 when performing an image display inspection before mounting the flexible printed circuit board 18. These lines are used to collectively apply source signals for inspection, and are removed by burning with a laser or the like before shipping as a product.
[0025]
The counter electrode 8 is an electrode for applying a signal voltage to the liquid crystal layer with a pixel electrode (not shown) formed in each pixel.
[0026]
Pixel TFT10 is Ri Contact is formed for each pixel, a switching element for turning on / off between the source line 2 and the pixel electrode by a gate signal applied from the gate line 1.
[0027]
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.
[0028]
The liquid crystal capacitor 12 is a capacitor formed between the pixel electrode and the counter electrode 8.
[0029]
The gate mounting terminal 13 is a terminal that is connected to the gate IC and supplies a gate signal from the gate IC.
[0030]
The source mounting terminal 14 is a terminal that is connected to the source IC and supplies a source signal from the source IC.
[0031]
The gate line 1 is collectively connected to the inspection gate signal terminal 3 via the inspection resistor 5 at the gate termination, and the source line 2 is collectively connected to the inspection source signal terminal 4 via the inspection resistor 6 at the source termination. is doing.
[0032]
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. The common capacitor line mounting terminal 15 and the counter electrode mounting terminal 16 are separated from each other on the array substrate. The common capacitance line mounting terminal 15 and the counter electrode mounting terminal 16 are connected by the internal wiring 19 of the flexible printed circuit board 18 and are taken out by the single common terminal 17 to the external circuit.
[0033]
Therefore, the common capacitor line 7 and the counter electrode 8 are electrically separated before the flexible printed circuit board 18 is mounted, and is opposed to the common capacitor line 7 after the flexible printed circuit board 18 is mounted. The electrode 8 has a structure that is electrically short-circuited.
[0034]
Next, the operation of this embodiment will be described.
[0035]
Note that the liquid crystal display device of this embodiment is based on the results of experiments conducted by the inventors. Therefore, first, an experiment conducted by the inventor will be described, and then the liquid crystal display device of the present embodiment will be described.
[0036]
First, the inventor manufactured parts other than the flexible printed circuit board 18 in the liquid crystal display device of FIG. That is, as shown in FIG. 1, the counter electrode 8 and the common capacitance line 7 are formed separately. Further, by irradiating the laser, the source line 2 and the common capacitor line 7 were short-circuited, and a shorted portion 9 was formed.
[0037]
Next, a display operation was performed on such a liquid crystal display device. That is, a 0 V voltage is applied to the counter electrode mounting terminal 16, a voltage of 2 V is applied to the source mounting terminal 14 , a voltage of 20 V is applied to the common capacitor line mounting terminal 15, and a voltage of 15 V is applied to the gate mounting terminal 13. I tried to apply.
[0038]
Then, the liquid crystal display device is in a display state, and a line defect that passes through the shorted portion 9 and is parallel to the source line direction is displayed, and a line defect that passes through the shorted portion 9 and is parallel to the gate line direction is displayed. It was.
[0039]
As described above, when the voltage as described above is applied to each terminal of the liquid crystal display device, when the shorted portion 9 exists, a horizontal line defect and a vertical line defect passing through the shorted portion 9 are detected. Is displayed.
[0040]
Although it has been confirmed in the conventional liquid crystal display device that the line defect in the source line direction is displayed through the shorted portion 9, the line defect in the gate line direction is displayed in the conventional liquid crystal display device. The liquid crystal display device cannot be confirmed.
[0041]
The reason why such a line defect in the gate direction is displayed can be estimated as follows. That is, since each common capacitor line 7 has a resistance of about 1 KΩ, the voltage drop of the common capacitor line 7 connected to the shorted portion 9 is the voltage drop of the other common capacitor line 7. Become bigger. From this, it can be assumed that a line defect in the gate line direction is displayed.
[0042]
However, when attention is paid to pixels other than the pixel corresponding to the shorted portion 9 among the pixels connected to the common capacitive line 7 connected to the shorted portion 9, the common capacitive line 7 is insulated from the counter electrode 8. In this state, the voltage between the pixel electrode and the counter electrode does not change even if a voltage drop occurs in the common capacitor line 7 because the pixel electrode is not electrically connected to the pixel electrode. It seems unlikely that line defects will be displayed.
[0043]
However, in actuality, the timing of applying a voltage to the counter electrode mounting terminal 16, the source mounting terminal 14 , the common capacitor line mounting terminal 15 , and the gate mounting terminal 13, and the structure of the pixel electrode, the counter electrode 8, the common capacitor line 7, and the like. It can be presumed that such a phenomenon occurs due to complicated factors such as the movement of electric charges due to the positional relationship.
[0044]
Next, an image display inspection based on the above facts will be described.
[0045]
That is, when an image display inspection is performed before mounting the flexible printed circuit board or the driving IC with the above-described configuration, the source signal applies a liquid crystal driving voltage of about 2 V with respect to the counter potential, and the common capacitance line is the source Is applied with a voltage of several tens of volts. By doing so, it becomes possible to display by applying a voltage 10 times as large as the counter-source voltage between the source line and the common capacitor line, and the source line 2 and the common capacitor line on the TFT array substrate. The voltage drop with respect to the other line where the defect occurs in the portion 9 where 7 is short-circuited is ten times as large as 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 display. Repair is possible.
[0046]
In addition, the common capacitance line mounting terminal 15 and the counter electrode mounting terminal 16 are connected after being mounted on the flexible printed circuit board and output as one common terminal 17 to the external circuit, so that the cost burden on the external circuit does not increase.
[0047]
As described above, in the present invention, without causing cost burden to an external circuit, a flexible printed circuit board and a driving IC mounting source in front of the image display inspection - common capacitor line short position detection can Ru superior liquid crystal An image display inspection method for a display device can be realized.
[0048]
The liquid crystal display device of the present invention may be a liquid crystal display device before the flexible printed circuit board of the present embodiment is mounted, or a liquid crystal display device after the flexible printed circuit board is mounted. May be.
[0049]
Furthermore, the flexible printed circuit board of the present embodiment is an example of the flexible printed circuit of the present invention.
[0050]
(Embodiment 2)
FIG. 2 shows an in-panel circuit diagram of the liquid crystal display device according to the second embodiment of the present invention. In the first embodiment, the internal wiring 19 of the flexible printed circuit board 18 faces the common capacitor line mounting terminal 15. The electrode mounting terminal 16 is connected to the external circuit and taken out by one common terminal 17. Instead of this, the common capacitor line mounting terminal 15 and the counter electrode are mounted after the source IC is mounted by the internal wiring 21 of the source IC 20. By connecting the mounting terminal 16 and outputting it as the common terminal 17 to the outside, the same effect as in the first embodiment of the invention can be obtained.
[0051]
Further, instead of the source IC, it is also possible to connect the common capacitor line mounting terminal 15 and the counter electrode mounting terminal 16 after mounting the gate IC by using the internal wiring of the gate IC.
[0052]
In addition, in the liquid crystal display device manufacturing method for manufacturing the liquid crystal display device of the present invention, the common capacitor line and the counter electrode are electrically separated from each other before the flexible printed circuit, the source IC, or the gate IC is mounted. A method of manufacturing a liquid crystal display device in which the common capacitor line and the counter electrode are electrically short-circuited after the flexible printed circuit, the source IC, or the gate IC is mounted also belongs to the present invention.
[0053]
The information processing apparatus further includes an information processing means for processing information and a display means for displaying the processed information or the processed information, and the display means uses the liquid crystal display device of the present invention. Is an invention related to the present invention. The information processing apparatus related to the present invention includes a personal computer, a PDA, and the like. In short, the information processing apparatus of the invention related to the present invention is an apparatus for displaying information on a display, as long as the liquid crystal display device of the present invention is used for the display.
[0054]
The television receiver further includes receiving means for receiving a broadcast wave and outputting a demodulated signal, and display means for displaying the demodulated signal, wherein the display means uses the liquid crystal display device of the present invention. The apparatus is also an invention related to the present invention.
[0055]
The wireless communication apparatus further includes a communication unit that performs wireless communication and a display unit that displays a GUI for controlling the wireless communication unit. The wireless communication device in which the liquid crystal display device of the present invention is used as the display unit. It is an invention related to the invention . Note that the wireless communication device of the invention related to the present invention includes devices such as mobile phone terminals, PHS terminals, and automobile phone terminals that communicate wirelessly.
[0056]
【The invention's effect】
As described above, the present invention eliminates a short-circuited portion caused by a defect during a process at the intersection of a source line and a common capacitor line for forming a storage capacitor without increasing the manufacturing cost of a liquid crystal display device. excellent liquid crystal display equipment manufacturing method which addresses can be identified and repaired by the image display inspection before use IC implementation, and the image display inspection how it is possible to realize.
[Brief description of the drawings]
FIG. 1 is a circuit diagram within a panel of a liquid crystal display device according to a first embodiment of the present invention. FIG. 2 is a circuit diagram within a panel of a liquid crystal display device according to a second embodiment of the present invention. Circuit diagram in the panel of the liquid crystal display device [Description of symbols]
DESCRIPTION OF SYMBOLS 1 Gate line 2 Source line 3 Gate collective inspection line 4 Source collective inspection line 5 Collective inspection gate line input resistance 6 Collective inspection source line input resistance 7 Common capacity line 8 Opposite electrode 9 Short part of a source line and a common capacity line 10 Pixel TFT
11 Holding Capacitor 12 Liquid Crystal Capacitor 13 Gate Mounting Terminal 14 Source Mounting Terminal 15 Common Capacitor Line Mounting Terminal 16 Counter Electrode Mounting Terminal 17 Common Capacitor Line and Counter Electrode Common Line 18 Flexible Printed Circuit Board 19 Flexible Printed Circuit Wiring 20 Source IC
21 Wiring in source IC

Claims (3)

A common capacitor line for forming a storage capacitor formed in a gate line direction on the TFT array substrate; and a counter electrode. The common capacitor line and the counter electrode are electrically on the TFT array substrate. An image display inspection method for performing an image display inspection of a liquid crystal display device that is separated and electrically short-circuited by a flexible printed circuit, a source IC, or a gate IC before mounting the flexible printed circuit, the source IC, or the gate IC. And
Applying a predetermined liquid crystal driving voltage to the source line of the liquid crystal display device with respect to the potential of the counter electrode,
Applying a voltage higher than the predetermined liquid crystal driving voltage with respect to the potential of the source line to the common capacitance line,
By identifying the line defect position in the gate direction and the line defect position in the source direction of the liquid crystal display device, the location where the source line and the common capacitance line of the liquid crystal display device are short-circuited,
The image display inspection method, wherein the voltage higher than the predetermined liquid crystal driving voltage is a voltage at which a line defect position in the gate direction can be confirmed when the source line and the common capacitance line are short-circuited.   A common capacitor line for forming a storage capacitor formed in the gate line direction on the TFT array substrate, a common capacitor line mounting terminal electrically connected to the common capacitor line, a counter electrode, and an electric power to the counter electrode The common capacitor line and the counter electrode are electrically separated on the TFT array substrate, and the common capacitor line mount terminal and the counter electrode mounting are connected to each other. The terminal is formed separately on the TFT array substrate, and the common capacitor
The quantity line mounting terminal and the counter electrode mounting terminal are connected by an internal wiring of a flexible printed circuit or a source IC or a gate IC, and the internal wiring is connected to a common terminal for connection to the outside. An image display inspection method in which the image display inspection is performed before mounting the flexible printed circuit or the source IC or the gate IC,
  Applying a predetermined liquid crystal driving voltage to the source line of the liquid crystal display device with respect to the potential of the counter electrode,
  Applying a voltage higher than the predetermined liquid crystal driving voltage with respect to the potential of the source line to the common capacitance line,
  By identifying the line defect position in the gate direction and the line defect position in the source direction of the liquid crystal display device, the location where the source line and the common capacitance line of the liquid crystal display device are short-circuited,
  The image display inspection method, wherein the voltage higher than the predetermined liquid crystal driving voltage is a voltage at which a line defect position in the gate direction can be confirmed when the source line and the common capacitor line are short-circuited. Wherein the common capacitor lines formed on the TFT array substrate so as to electrically isolate the counter electrode and each other physician,
Before the flexible printed circuit or the source IC or the gate IC is mounted, an image display inspection is performed using the image display inspection method according to claim 1 or 2,
A method of 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 the flexible printed circuit, the source IC, or the gate IC is mounted.

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