JP2002328628A - Display driving device, display device and inspecting method of display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display driving device, a display device and an inspection method of the display device in which defects in electrical connections of the display driving device and electrodes formed on a transparent substrate can be easily inspected. SOLUTION: A liquid crystal driving semiconductor chip 15 is provided with resistors 16a and 16b which are not connected to a display driving circuit and resistor electrodes 20a, 20b, 22a and 22b which are respectively connected to both ends of the resistors 16a and 16b. During a mounting connection, the both ends of the resistors 16a and 16b are connected to power supply wiring 12a and 12b having different potentials through electrodes 9a, 9b, 10a and 10b on a transparent substrate 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display panel,
The present invention relates to a display driving device, a display device, and a method of inspecting a display device that can easily detect a poor electrical connection between a display panel such as an EL (electroluminescence) display panel and an electrochromic display panel, and a display driving device. .

[0002]

2. Description of the Related Art Conventionally, in a manufacturing process of a liquid crystal display device, after a semiconductor chip for driving a liquid crystal (display driving device) is mounted on an electrode formed on one transparent glass substrate constituting a liquid crystal display panel. Inspection has been conducted to check whether or not the liquid crystal driving semiconductor chip is properly connected to the electrodes.

In a conventional method for mounting a semiconductor chip for driving a liquid crystal, a semiconductor chip for driving a liquid crystal is mounted on a transparent glass surface by using an anisotropic conductive film (hereinafter referred to as ACF (Anistropic Conductive Fibre)).
lm)), a thermocompression bonding apparatus is used as a mounting method.

[0004] This thermocompression bonding apparatus, as shown in FIG.
The thermocompression head 132 and the panel support 130 connected to the shaft 133 are both in contact with the liquid crystal driving semiconductor chip 115 of the thermocompression head 132 based on the drive control of the parallelism adjustment unit (not shown) ( Hereinafter, it is referred to as a pressing surface.
2a is adjusted so as to always maintain a parallel relationship with the contact surface of the panel support 130 with the liquid crystal display device 131.

However, not all of the liquid crystal driving semiconductor chips 115 to be mounted are mounted in a completely parallel manner, and are mounted with a certain inclination θ, so that the liquid crystal driving semiconductor chips 115 are mounted on the electrodes of the transparent glass substrate. After mounting, an inspection is performed to check whether or not the liquid crystal driving semiconductor chip 115 is connected normally.

Japanese Patent Laid-Open No. 6-82802 discloses a liquid crystal display device capable of easily confirming the electrical connection between an electrode on a transparent glass substrate and a semiconductor chip for driving a liquid crystal.
No. 6,086,045.

In the liquid crystal display device disclosed in the above publication, as shown in FIG. 13, the liquid crystal driving semiconductor chip 104 is made of a transparent glass to inspect the electrical connection between the electrodes of the transparent glass substrate and the liquid crystal driving semiconductor chip. When mounted on the substrate 103, a plurality of connection resistance measurement patterns 101 and 102 connected to each other are provided on the transparent glass substrate 103.

Immediately after mounting the liquid crystal driving semiconductor chip 104, the connection resistance of the connection resistance measuring patterns 101 and 102 is measured, and based on the magnitude of the connection resistance as a result of the measurement, the electrodes 109 of the liquid crystal driving semiconductor chip 104 are measured. When,
The state of electrical connection between the transparent glass substrate 103 and the electrodes 107b and 108a can be determined.

For example, when the measurement result is higher than a predetermined connection resistance value, it is determined that the connection between the liquid crystal driving semiconductor chip 104 and the electrodes 107b and 108a on the transparent glass substrate 103 is not normal, and a connection failure is determined. The determined liquid crystal driving semiconductor chip 104 is removed, and a new liquid crystal driving semiconductor chip is mounted again.

In this manner, by confirming the electrical connection state between the liquid crystal driving semiconductor chip 104 and the electrodes 107b and 108a one by one, the connection reliability in which all the liquid crystal driving semiconductor chips 104 are normally connected is confirmed. A liquid crystal display device with high performance can be provided.

In addition to the above, as another method for confirming the electrical connection state between the liquid crystal driving semiconductor chip and the electrode provided on the transparent glass substrate, a liquid crystal display device is assembled until a display screen is displayed. There is also a method of confirming from the display state of the display screen whether there is any problem in the electrical connection state between the liquid crystal driving semiconductor chip and the electrode provided on the transparent glass substrate.

[0012]

However, the above-mentioned conventional liquid crystal display device has the following problems.

That is, in the method of inspecting the electrical connection between the electrodes of the liquid crystal driving semiconductor chip and the electrodes of the transparent glass substrate after mounting the liquid crystal driving semiconductor chip, the liquid crystal driving semiconductor chip is placed on the transparent glass. It is necessary to provide an inspection pad for measuring the connection resistance between the electrode and the electrode of the transparent glass substrate.

[0014] This requires an extra space for forming a pattern on the transparent glass substrate, which increases the area of the transparent glass substrate. That is, the proportion of the frame portion other than the display portion in the surface area on the display portion side of the liquid crystal display device increases. For this reason,
There is a problem that the design using the liquid crystal display device is restricted.

In order to inspect the electrical connection,
In addition to the necessity of an inspection jig, it is necessary to inspect all the liquid crystal driving semiconductor chips even when the proportion of the liquid crystal driving semiconductor chips with incomplete electrical connection is small. Therefore, the time required for the inspection becomes very long. For this reason, the production efficiency of the liquid crystal display device is reduced, which causes a cost increase.

On the other hand, the method for determining the connection state between the liquid crystal driving semiconductor chip and the electrode provided on the transparent glass substrate based on the display state of the display screen has the following problems.

That is, in the connection state inspection, when the flowing current is small, since the voltage drop is small, it is difficult to determine from the display screen that the connection resistance is high.

Therefore, when the liquid crystal display device is shipped as it is and used for a long period of time, the connection resistance gradually increases, and finally the connection is incomplete and the display screen becomes abnormal. There is a high possibility that problems will occur in terms of product reliability.

When the control electrode of the display driving device is arranged on the outer periphery side of the power supply electrode, the control electrode shown in FIG.
As shown in the figure, when the liquid crystal driving semiconductor chip 115 is mounted on the transparent glass substrate surface via an ACF by a thermocompression bonding device, the degree of parallelism of the pressing surface 132a of the thermocompression bonding head 132 to the surface of the liquid crystal display device 131 is very small. Lost at different levels. Further, when the pressure is not applied to the side B of the display driving device more than the other side D, the pressure applied to the bump 134 of the liquid crystal driving semiconductor chip 115 is 151a> 1.
52a>151b>151c>151d>152b> 1
51e.

When the bump 151e having the lowest pressure is the control terminal of the semiconductor chip 115 for driving the liquid crystal,
The input / output impedance is larger than that of the power supply terminal, and even if a connection resistance between the bump 151e and the electrode on the transparent substrate is generated, the current that originally flows is small, so that the voltage drop at that location is small. Therefore, the device may operate normally without any electrical problems in the initial stage after connection, and when used for a long time as a liquid crystal display device, the connection resistance at that location gradually increases, causing a problem in display. There is.

Such a problem also occurs in other display devices such as an EL display device and an electrochromic display device.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a display driving device and a transparent glass substrate without restricting the design of the display device or increasing the cost. It is an object of the present invention to provide a display driving device, a display device, and a method for inspecting a display device, which can easily detect the quality of the electrical connection with the formed electrodes.

[0023]

According to a first aspect of the present invention, there is provided a display driving device including a first electrode for mounting connection, wherein the first electrode is mounted and connected on a substrate of the display device. The first electrode is connected to a power supply wiring via a second electrode formed on the substrate, and in a display driving device to which power is supplied, a resistance not connected to the display driving circuit;
A resistor electrode connected to both ends of the resistor, and at the time of mounting connection, both ends of the resistor have different potentials via a second electrode provided at a position corresponding to the resistor electrode. It is characterized by being connected to a power supply wiring.

According to the above configuration, by measuring the current flowing through the power supply wiring to which the resistor provided in the display driving device is connected, the first electrode formed on the display driving device and the substrate are formed. It can be easily determined whether or not the connection with the second electrode made is defective. Thus, when the connection is defective, the display drive having the poor connection is removed, and the display drive is mounted again, whereby a display drive with high connection reliability can be obtained.

That is, when the first electrode formed on the display driving device and the second electrode formed on the substrate of the display device have a poor connection, the overall resistance value is determined by the resistance of the poor connection portion. Becomes larger. Further, since the resistance value provided in the display driving device is a known value provided as a predetermined value, the current flowing through the power supply wiring when the connection between the first electrode and the second electrode is normal. Can be the specified value. Therefore, when there is a connection failure, the current value flowing through the power supply wiring is smaller than the current value when there is no connection failure, and it is only necessary to compare the current value with the specified value to determine whether the connection is defective. Can be determined.

In the display driving circuit in the display driving device,
When the power supply voltage fluctuates, the input impedance to the power supply changes. For example, in the case of a source driver that drives a source signal line which is a data signal line of a display panel, even if the input power supply voltage is reduced due to the characteristics of the source driver, the same voltage level is maintained with respect to the input video signal. Since the current is going to flow to the output load, the value of the current flowing to the load is
Hardly change. As described above, since the display driving circuit provided in the display driving device of the present invention does not include only a normal resistor, even if the input power supply voltage changes, the internal transistor characteristics may change. In some cases, the input impedance to the power supply may not be constant due to an attempt to supply a constant current to the load. Therefore, by measuring the sum of the currents flowing through the resistors, which are directly affected by the connection resistance in the current value, it is possible to reliably detect the resistance value due to poor contact.

Further, since it is not necessary to form a connection failure inspection wiring pattern on the substrate to perform the connection resistance inspection, the area of the frame portion of the substrate does not increase. Therefore, for example, even when the display device according to the present invention is applied to a product such as a liquid crystal television, it is possible to avoid giving a design constraint to the product.

Further, according to the above configuration, the resistor is provided inside the display driving device, and a change in the value of the current flowing through the power supply wiring formed on the substrate causes the connection failure of the display driving device. Is determined, the connection failure can be inspected at the same time in the current inspection step. Therefore, it is possible to omit the conventional inspection process for examining only the connection failure,
The manufacturing efficiency can be improved, and the cost of the product can be reduced.

The power supply wiring is connected to ground (0 V).
Power supply wiring connected to the power supply.

In order to solve the above-mentioned problems, the display driving device of the present invention includes a first electrode for mounting connection, and when mounted on a substrate of the display device, the first electrode is connected to the first electrode. ,
In a display driving device which is connected to power supply wiring via a second electrode formed on the substrate and is supplied with power,
The display drive circuit includes a resistor having only one end electrically connected to the display drive circuit, and a resistor electrode connected to the other end of the resistor. And a power supply line having a potential different from a power supply line of a display drive circuit to which one end of the resistor is connected via the second electrode.

According to the above arrangement, by measuring the current flowing through the power supply wiring connected to the resistor provided in the display driving device, the first electrode formed on the display driving device and the substrate are measured. It can be easily determined whether or not the connection with the second electrode made is defective. Thus, when the connection is defective, the display drive having the poor connection is removed, and the display drive is mounted again, whereby a display drive with high connection reliability can be obtained.

That is, when the first electrode formed on the display driving device and the second electrode formed on the substrate of the display device have a poor connection, the overall resistance value is determined by the resistance of the poor connection portion. Becomes larger. Further, since the resistance value provided in the display driving device is a known value provided as a predetermined value, the current flowing through the power supply wiring when the connection between the first electrode and the second electrode is normal. Can be the specified value. Therefore, when there is a connection failure, the current value flowing through the power supply wiring is smaller than the current value when there is no connection failure, and it is only necessary to compare the current value with the specified value to determine whether the connection is defective. Can be determined.

Further, according to the present invention, in the display driving device, one end of the resistor is connected to the power supply wiring of the display driving circuit, and the other end of the resistance electrode is electrically open. This is effective for a connection failure inspection when the width of the display driving device is small. For example, when only the connection failure inspection on one of the resistance electrodes to which the other end of the resistance is connected is sufficient,
Even if the resistance electrode at one end of the resistor formed on the display driving device cannot be formed, and furthermore, even if the wiring pattern formed on the substrate cannot be formed up to both ends of the display driving device, the first driving device of the display driving device can be formed. A connection failure between the first electrode and the second electrode on the substrate can be detected.

The power supply wiring is grounded (0 V).
Power supply wiring connected to the power supply.

Further, it is more preferable that the resistance electrode is arranged on the outer peripheral side of the line on which the first electrode is arranged.

Accordingly, when the display driving device is mounted on the display device by using a mounting device such as a thermocompression bonding head, a uniform regular electrode is uniformly applied to each electrode of the display driving device due to the slight inclination of the thermocompression head or the like. When no pressure is applied, a poor connection between the first electrode of the display driving device and the second electrode on the substrate of the display device caused by long-term use can be more reliably detected, and the cost can be reduced. Therefore, it is possible to obtain a display driving device which is advantageous and highly reliable.

That is, when the display drive device is mounted and connected obliquely with a slight inclination to the surface of the substrate, the resistive electrodes are first and last among the electrodes formed on the display drive device. The resistance electrode is formed so that the pressure is applied at the timing of (1). Accordingly, when the display driving device is mounted and connected on the substrate with a slight inclination, the resistance electrodes provided on the outermost peripheral side are provided at the highest and lowest pressure positions. The lower resistance electrode is most likely to cause connection failure. That is, if the resistance electrode is poorly connected, it can be recognized that the display driving device is mounted obliquely.

On the other hand, the resistive electrode is formed on the line on which the other electrode is formed, that is, when the resistive electrode and the other electrode are inclined and mounted and connected, pressure is applied to the resistive electrode and the other electrode at the same timing. In this case, the connection between the resistance electrode and the other electrode becomes defective at the same time, so that the connection is obliquely mounted and connected, and the connection gradually becomes poor during continuous use of the display device. Connection failure cannot be found.

Therefore, according to the display driving device of the present invention, it is possible to find a preliminary connection failure point where a connection failure point occurs during continuous use of the display device after commercialization. Claims can be reduced.

In order to solve the above-described problems, the display device of the present invention is connected to a display driving device having a first electrode for mounting connection and a plurality of power supply wires having different potentials. A display device comprising a substrate on which a second electrode connected to the first electrode is formed when the display drive device is mounted and connected, wherein the display drive device includes a display drive circuit, an unconnected resistor, A resistor electrode connected to both ends of the resistor, and at the time of mounting connection, via a second electrode provided at a position corresponding to the resistor electrode,
The invention is characterized in that both ends of the resistor are connected to the power supply wiring having different potentials.

According to the above arrangement, by measuring the current flowing through the power supply wiring connected to the resistor provided in the display driving device, the first electrode formed on the display driving device and the substrate are formed. It can be easily determined whether or not the connection with the second electrode made is defective. Thus, when the connection is defective, the display driving device having the defective connection is removed, and the display driving device is mounted again, whereby a display device with high connection reliability can be obtained.

That is, when the first electrode formed on the display driving device and the second electrode formed on the substrate of the display device have a poor connection, the overall resistance value is determined by the resistance of the poor connection portion. Becomes larger. Further, since the resistance value provided in the display driving device is a known value provided as a predetermined value, the current flowing through the power supply wiring when the connection between the first electrode and the second electrode is normal. Can be the specified value. Therefore, when there is a connection failure, the current value flowing through the power supply wiring is smaller than the current value when there is no connection failure, and it is only necessary to compare the current value with the specified value to determine whether the connection is defective. Can be determined.

In the display driving circuit in the display driving device,
When the power supply voltage fluctuates, the input impedance changes. For example, due to the characteristics of the source driver, even if the input power supply voltage drops,
Since the current flows to the output load until the voltage level becomes the same, the current value flowing through the load hardly changes even if the input voltage slightly changes. However, since the display drive circuit provided in the display drive device of the present invention does not include only a normal resistor, even if the input voltage fluctuates, the internal transistor characteristics may change or the constant current may not change. , The input impedance may not be constant. Therefore, by measuring the sum of the current flowing through the resistor, the effect of the connection resistance appears directly on the current value,
It is possible to reliably detect a resistance value due to poor contact.

Further, since it is not necessary to form a wiring pattern for the connection failure inspection on the substrate to perform the connection failure inspection, the area of the frame portion of the substrate does not increase. Therefore, for example, even when the display device according to the present invention is applied to a product such as a liquid crystal television, it is possible to avoid giving a design constraint to the product.

Further, according to the above configuration, the resistor is provided inside the display driving device, and the resistance value is determined based on the change in the value of the current flowing through the power supply wiring connecting the second electrodes formed on the substrate. Since the connection failure of the display driving device is determined, the connection failure can be inspected simultaneously in the current inspection step. Therefore, the conventional inspection process for examining only the connection failure can be omitted, the manufacturing efficiency can be improved, and the cost of the product can be reduced.

The power supply line is connected to ground (0 V).
Power supply wiring connected to the power supply.

In order to solve the above-mentioned problems, a display device of the present invention includes a display driving device having a first electrode for mounting connection, and a substrate on which the display driving device is mounted and connected.
A display device comprising: a plurality of power supply lines having different potentials; and a second electrode connected to the first electrode when the display drive device is mounted and connected. And a resistor having only one end electrically connected to the driving circuit, and a resistor electrode connected to the other end of the resistor, and at the time of mounting connection, the resistor electrode connected to the other end of the resistor, One end of the resistor is connected to a power supply line having a different potential from the power supply line of the display drive circuit to which one end of the resistor is connected via the second electrode.

According to the above configuration, by measuring the current flowing through the power supply wiring connected to the resistor provided in the display driving device, the first electrode formed on the display driving device and the substrate are formed. It can be easily determined whether or not the connection with the second electrode made is defective. Thus, when the connection is defective, the display driving device having the defective connection is removed, and the display driving device is mounted again, whereby a display device with high connection reliability can be obtained.

That is, when the first electrode formed on the display driving device and the second electrode formed on the substrate of the display device have a poor connection, the overall resistance value is determined by the resistance of the poor connection portion. Becomes larger. Further, since the resistance value provided in the display driving device is a known value provided as a predetermined value, the current flowing through the power supply wiring when the connection between the first electrode and the second electrode is normal. Can be the specified value. Therefore, when there is a connection failure, the current value flowing through the power supply wiring is smaller than the current value when there is no connection failure, and it is only necessary to compare the current value with the specified value to determine whether the connection is defective. Can be determined.

Further, according to the present invention, in the display driving device, the resistance electrode to which one end of the resistor is connected is connected to the power supply wiring of the display driving circuit, and the resistance electrode to which the other end is connected is electrically connected. This is effective for a connection failure inspection when the width of the display driving device is narrow. For example,
When only the connection failure test on one of the resistance electrodes to which the other end of the resistance is connected is sufficient, or when the resistance electrode at one end of the resistance formed on the display driving device cannot be formed, furthermore, the wiring formed on the substrate Even when the pattern cannot be formed up to both ends of the display driving device, a connection failure between the first electrode of the display driving device and the second electrode on the substrate can be detected.

The power supply wiring is connected to ground (0 V).
Power supply wiring connected to the power supply.

Further, it is more preferable that the resistance electrode is arranged on the outer peripheral side of the display driving device with respect to the line on which the first electrode is arranged.

Accordingly, when the display driving device is mounted on the display device using a mounting device such as a thermocompression bonding head, a uniform and regular electrode is uniformly applied to each electrode of the display driving device due to a slight inclination of the thermocompression bonding head or the like. When no pressure is applied, a poor connection between the first electrode of the display driving device and the second electrode on the substrate caused by long-term use can be more reliably detected, and the cost is also advantageous. And a highly reliable display device can be obtained.

That is, when the display driving device of the display device is mounted and connected obliquely with a slight inclination to the surface of the substrate, the resistance electrode among the electrodes formed on the display driving device becomes The resistance electrode is formed such that pressure is applied at the first and last timings. Accordingly, when the display driving device is mounted and connected on the substrate with a slight inclination, the resistance electrodes provided on the outermost peripheral side are formed at the highest pressure position and the lowest pressure position. The lower resistance electrode is most likely to cause connection failure. That is, if the resistance electrode is poorly connected, it can be recognized that the display driving device is mounted obliquely.

On the other hand, the resistive electrode is formed on the line on which the other electrode is formed. That is, when the resistive electrode and the other electrode are inclinedly mounted and connected, pressure is applied to the resistive electrode and the other electrode at the same timing. In this case, the connection between the resistance electrode and the other electrode becomes defective at the same time, so that the connection is obliquely mounted and connected, and the connection gradually becomes poor during continuous use of the display device. Connection failure cannot be found.

Therefore, according to the display device of the present invention, it is possible to find a preliminary connection failure portion in which a connection failure portion occurs during continuous use after commercialization of the display device. Occurrence can be reduced.

According to the method for inspecting a display device of the present invention, when power is supplied to the display device from the power supply wiring to the display driving device, a current flowing through the power supply wiring is measured, and the first result is determined from the measurement result. It is characterized in that a connection failure between the first electrode and the second electrode is detected.

According to the above-described inspection method, the first electrode formed on the display driving device and the second electrode formed on the substrate are simply measured by measuring the current flowing through the power supply wiring formed on the substrate. Connection failure with the electrode can be easily detected.

In the conventional inspection method of a display device, it is necessary to provide an inspection pad for a connection failure inspection on a substrate, and the area of the substrate is enlarged, which imposes restrictions on design at the time of commercialization, or a specific inspection. A jig is required, and there is a problem that an inspection process for examining only a connection failure must be performed and a 100% inspection must be performed.

According to the display device inspection method of the present invention, the connection failure can be easily determined only by measuring the current flowing through the power supply wiring formed on the substrate. Therefore, the connection failure inspection can be performed simultaneously with the current inspection. become. Therefore, one of the inspection steps can be omitted, the manufacturing efficiency can be improved, and the cost of the product can be reduced.

Further, in a display device in which one resistance electrode to which the other end of the resistor is connected is connected to the power supply wiring of the display drive circuit, the width of the display drive device is small, and the connection failure is inspected. Even if it is difficult to perform the inspection, it is possible to perform a connection failure inspection.

[0062]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] One embodiment of a display driving device, a display device, and a method for inspecting a display device of the present invention will be described with reference to FIG.
The following is a description based on FIG.

First, as a liquid crystal display panel provided in the liquid crystal display device of the present embodiment and a display driving device for driving the liquid crystal display device mounted on the liquid crystal display panel, a liquid crystal driving semiconductor chip (display device) is used. The configuration of the driving device will be described with reference to FIGS.

The liquid crystal display panel 1 provided in the liquid crystal display device according to the present embodiment has a pair of transparent substrates (substrates) 2.3 as shown in FIG. An electrode (a second electrode) is provided on one end of the transparent substrate 3 other than the display portion.
5, 6, 7a, 7b, 8a, 8b, 9a, 9b, 10a
10b, signal wiring 11 and wiring 12 are formed.

The electrode 5 is a control terminal connection electrode of the liquid crystal driving semiconductor chip 15 shown in FIG.
c.

The electrode 6 is an electrode (pad) for connecting an output terminal of the liquid crystal driving semiconductor chip 15 shown in FIG. 1, and is connected to a signal wiring 11 connected to a liquid crystal display element (not shown).

The electrodes 7a and 7b are power supply terminal connection electrodes (pads) of one power supply, and are electrically connected to the electrodes 9a and 9b, which are resistance terminal connection electrodes, by a power supply wiring 12b.

The electrodes 8a and 8b are power supply terminal connection electrodes (pads) of the other power supply having a potential different from that of the one power supply (electrodes 7a and 7b), and are electrodes serving as resistance terminal connection electrodes. Along with 10a and 10b, they are electrically connected by a power supply wiring 12a.

Next, the liquid crystal driving semiconductor chip 15 mounted on one transparent substrate 3 of the liquid crystal display panel 1 will be described below.

As shown in FIG. 1, the liquid crystal driving semiconductor chip 15 has electrodes (first electrodes) 17 and 18, resistance electrodes 20a, 20b, 22a and 22b, and power supply electrodes (first electrodes) 19a and 19a. 19b and power supply electrode (first electrode) 21
a.21b are also formed. The resistance electrodes 20a
The resistor 16a is provided between the resistor electrodes 22b and 22b, and the resistor 16b is provided between the resistor electrodes 20b and 22b.

The electrodes 17 and 18 and the power supply electrode 19a
The 19b and the power supply electrodes 21a and 21b are connected to a display drive circuit (not shown).

The electrodes 17 are liquid crystal drive semiconductor control electrodes (bumps). When the liquid crystal drive semiconductor chip 15 is mounted on the transparent substrate 3, the electrodes 17 are electrically connected to the electrodes 5 provided at corresponding positions. Is done.

The electrode 18 is an electrode (bump) for driving the liquid crystal display device, and is electrically connected to the electrode 6 when the semiconductor chip 15 for driving liquid crystal is mounted.

Power supply electrodes 19a and 19b and power supply electrode 2
1a and 21b are connected to the electrodes 7a and 7b and the electrodes 8a and 8b when the liquid crystal driving semiconductor chip 15 is mounted.

Resistive electrodes 20a and 20b and resistive electrode 2
Reference numerals 2a and 22b denote resistive electrodes (bumps) provided with the resistors 16a and 16b. When the liquid crystal driving semiconductor chip 15 is mounted, the electrodes 9a and 9b and the electrodes 10a
-It is electrically connected to 10b.

The electrode 18 serving as a liquid crystal display element driving electrode and the electrode 6 corresponding to the electrode 18 on the transparent substrate 3 are shown in FIG. 2 as three electrodes. Is simplified. Since the electrodes 6 and 18 are usually 100 to 300 and have a pitch width of several tens of μm, the resistance electrodes 20a connected to the resistors 16a and 16b
Even if the 20b and the resistance electrodes 22a and 22b are provided, the shape of the semiconductor chip 15 for driving the liquid crystal does not become large and does not cause a cost increase.

The same applies to the electrode 17 which is a semiconductor control electrode for driving a liquid crystal and the electrode 5 corresponding thereto.

When the liquid crystal driving semiconductor chip 15 shown in FIG. 1 is mounted on the transparent substrate 3 shown in FIG. 2, the electrodes at the corresponding positions are connected as shown in FIG.

Here, according to the sectional view taken along the line AA ′ in FIG. 3 showing the liquid crystal display device of the present embodiment, as shown in FIG. 4, the liquid crystal display device is provided on the liquid crystal driving semiconductor chip 15. Each electrode is electrically connected to the corresponding electrode provided on the transparent substrate 3 by the anisotropic conductive adhesive 30.

The electrode 18, which is the output electrode of the semiconductor chip 15 for driving a liquid crystal, is electrically connected to the electrode 6 on the transparent substrate 3 by an anisotropic conductive adhesive 30. The electrode 6
Are connected to a liquid crystal display element (not shown) of the liquid crystal display panel 1 by a signal wiring 11.

The liquid crystal 32 is sealed between the transparent substrate 3 and the opposing transparent substrate 2 by a sealing material 31. The sealing material 31 is provided around the edges of the upper transparent substrate 2 and the lower transparent substrate 3.
3 are bonded together while maintaining a constant gap.

In the liquid crystal display device of this embodiment, the connection state between the liquid crystal driving semiconductor chip 15 and each electrode formed on the transparent substrate 3 can be accurately inspected by the above configuration.

That is, the connection state between the resistance electrodes 20a and 22a and the resistance electrodes 20b and 22b at both ends to which the resistors 16a and 16b are connected, and the signal wiring 11 and the wiring 12 of the transparent substrate 3 are normal. In some cases, a power supply voltage Va (V) applied to the power supply wiring 12a connected to the power supply (potential of the power supply electrodes 21a and 21b) and a voltage applied to the power supply wiring 12b (power supply electrodes 19a and 19)
b) (potential b) is ground (0 V), and the resistances of the resistors 16a and 16b are Ra and Rb, respectively.
The current Ia flowing through a is represented by the following equation (1).

Ia = Va × (Ra + Rb) / (Ra × Rb) + Ic (1) The above Ic flows through the circuits (excluding the resistors 16a and 16b) in the liquid crystal driving semiconductor chip 15. It is a current value.

On the other hand, for example, the liquid crystal driving semiconductor chip 1
5, the connection between the resistance electrode 22a at one end of the resistor 16a and the corresponding electrode 10a of the transparent substrate 3 is incomplete,
It is assumed that the connection resistance value is Rx. in this case,
The current Ic is Ic ′ due to the influence of the resistance value Rx (Ic> Ic ′).

In this case, the current I flowing through the power supply line 12a is
a ′ is represented by the following equation (2).

Ia ′ = {Va × (Ra + Rx + Rb) / ((Ra + Rx) × Rb)} + Ic ′ (2) From the above equations (1) and (2), Ia−Ia ′ = Va
× Rx / {Ra (Ra + Rx)} + (Ic−Ic ′)>
It becomes 0.

Therefore, since Ia> Ia ′, Ia
a ′ is the power supply wiring 1 when the resistance electrode 22 a at one end of the resistor 16 a of the liquid crystal driving semiconductor chip 15 and the corresponding electrode 10 a of the transparent substrate 3 are normally connected.
It is smaller than the current Ia flowing through 2a. This makes it possible to determine that the connection between the liquid crystal driving semiconductor chip 15 and the transparent substrate 3 is incomplete, and removes the defectively connected liquid crystal driving semiconductor chip 15 and re-mounts it, thereby achieving high connection reliability. A liquid crystal display device can be obtained.

In the above configuration, it is not necessary to form a pattern such as an inspection pad on the transparent substrate 3.
The connection failure of the liquid crystal driving semiconductor chip 15 can be determined without increasing the area of the frame portion. So, for example,
There is no design restriction on products using a liquid crystal display device such as a liquid crystal television.

In the liquid crystal display device of the present embodiment, a resistor is provided inside the liquid crystal driving semiconductor chip 15, and the wiring 12 connecting the electrodes formed on the transparent substrate 3 is formed.
Of the liquid crystal driving semiconductor chip 1
5 is determined to be defective. For this reason, the step of inspecting only the connection failure, which has been conventionally performed, is unnecessary, and the connection failure can be inspected at the same time in the current inspection step. Therefore, in the inspection process after the production of the liquid crystal display device, the step of determining the connection failure can be omitted, so that the production efficiency can be improved and the cost of the product can be reduced.

The above-described current inspection step is one of inspection steps for determining a connection failure in the liquid crystal display device.
This is an inspection for checking a defect of the liquid crystal display device by determining a change in a current flowing in the liquid crystal display device in a display state.

In the conventional current inspection process, when a current increases in a circuit in a semiconductor chip due to a leak or the like, the liquid crystal display may operate normally. Was connected to an ammeter, the data was analyzed by computer, and the inspector was notified on a computer screen or by a buzzer.

In the current inspection step in the liquid crystal display device of this embodiment, the conventional current inspection step is performed by managing the maximum value of the current due to the leak current inside the semiconductor chip and the minimum value of the current value for detecting the resistance failure. Thus, both inspections can be performed at the same time.

However, if a current value of a specified value is measured when both failures occur simultaneously, the failure cannot be found, but the probability that both failures occur simultaneously is very low. . For example, assuming that the probability of occurrence of a defect due to leakage inside the semiconductor chip is 1 / X and the probability of connection failure of the semiconductor chip for driving a liquid crystal is 1 / Y, the probability of occurrence of both defects is 1 / (X × Y). And the probability becomes very small. Therefore, the case where both of these failures occur simultaneously can be ignored, and the failure occurrence rate of the product due to the failure to detect the connection resistance failure can be further reduced.

In the liquid crystal display of this embodiment, the voltage applied to the power supply wiring 12a (the power supply electrodes 21a
b) is set to Va (V), and the voltage (power supply electrodes 19a and 19b) applied to the power supply wiring 12b is set to the ground (0V). However, the present invention is not limited to this. If the voltages applied to the power supply wiring 12a and the power supply wiring 12b are different, that is, if the power supply electrodes 19a and 19b and the power supply electrodes 21a and 21b are configured to have different potentials, the same as in the present embodiment. The effect can be obtained.

[Embodiment 2] Another embodiment of the liquid crystal display device and the inspection method of the liquid crystal display device of the present invention will be described below with reference to FIG.

[0097] For convenience of explanation, members having the same functions as those in the drawings described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the liquid crystal display device of this embodiment, as shown in FIG. 5, one ends of resistors 16a and 16b provided at both ends of a semiconductor chip 25 for driving a liquid crystal are connected to power supply electrodes 19a and 19b connected to the ground. Are connected via a wiring 35 formed on the liquid crystal driving semiconductor chip 25, which is different from the liquid crystal display device described in the first embodiment. The resistance electrodes 20a and 20b may be omitted from the liquid crystal driving semiconductor chip 25. The electrodes and wirings formed on the transparent substrate 3 are described in the first embodiment.
However, the electrodes 9a and 9b may be omitted in the same manner as the resistance electrodes 20a and 20b.

In the liquid crystal display device of this embodiment, the resistance electrodes 22a and 22b respectively connected to the other ends of the resistors 16a and 16b are electrically open, and one end of one of the resistors is connected to the other end. , Liquid crystal driving semiconductor chip 25
Are connected to the power supply electrodes 19a and 19b connected to the ground.

Further, the liquid crystal driving semiconductor chip 25
Are mounted on the transparent substrate 3 as in the first embodiment.

With the above configuration, for example, the resistance electrode 22a at one end of the resistance 16a of the liquid crystal driving semiconductor chip 15
And the corresponding electrode 10 formed on the transparent substrate 3
When the connection with a is incomplete, as in the first embodiment, the current flowing through the liquid crystal driving semiconductor chip 25 is smaller than the current when the connection is normally made. Therefore, it can be determined that the connection between the liquid crystal driving semiconductor chip 25 and the electrode formed on the transparent substrate 3 is incomplete.

The liquid crystal driving semiconductor chip 25 used in this embodiment is more preferably applied to the following cases.

For example, when the width of the liquid crystal driving semiconductor chip 25 is narrow and only the inspection of one electrode side to which the resistors 16a and 16b are connected is sufficient,
In this case, the electrodes at one end of the resistors 16a and 16b incorporated in the semiconductor substrate 25 cannot be formed, and the wiring pattern formed on the transparent substrate 3 cannot be formed up to both ends of the semiconductor chip 25 for driving liquid crystal. Even in the case described above, according to the liquid crystal driving semiconductor chip 25, it is possible to determine a poor connection between the liquid crystal driving semiconductor chip 25 and each electrode formed on the transparent substrate 3.

In the liquid crystal display devices according to the first and second embodiments, an example is described in which two resistors are provided on the liquid crystal driving semiconductor chip. However, the present invention is not limited to this. Embodiment 1
2 can be obtained similarly.

Further, the liquid crystal display devices of Embodiments 1 and 2
It can be widely applied to liquid crystal display devices regardless of a display method such as a simple matrix type or an active matrix type.

Further, in the liquid crystal display device of the present invention, one or more resistors are built in the semiconductor chip for driving liquid crystal, and both terminals of the resistors are electrically open. When connected to the substrate of the liquid crystal display element,
Both terminals of the resistor may be connected to a power supply (including a ground) having a potential difference for driving the liquid crystal by wiring on the substrate.

Further, in the liquid crystal display device of the present invention, one or more resistors are built in the semiconductor chip for driving the liquid crystal, and one terminal of the resistors is electrically open, and the other of the resistors is the other terminal. Are connected to power terminals (including grounds) of the liquid crystal driving semiconductor chip in the liquid crystal driving semiconductor chip, and when the liquid crystal driving semiconductor chip is connected to the substrate of the liquid crystal display element. The one terminal of the resistor is connected to the liquid crystal driving semiconductor chip having a potential different from the power supply (including ground) of the liquid crystal driving semiconductor chip to which the other terminal of the resistor is connected by the wiring of the substrate. It may be connected to a power supply (including ground).

[Embodiment 3] FIGS. 6 to 11 show still another embodiment relating to the display driving device of the present invention.
The following is a description based on (a) and (b).

[0109] For convenience of explanation, the first and second embodiments are described.
For members having the same functions as the drawings described in
The same reference numerals are added, and the description is omitted.

The liquid crystal driving semiconductor chip (display driving device) 15 ′ according to the present embodiment has electrodes 17, as shown in FIG.
d · 17e are provided outside the line where the power supply electrodes 19a / 21a and the power supply electrodes 19b / 21b are located, and the resistance electrodes 20a / 20b and the resistance electrode 2
2a and 22b are on the outer peripheral side of the liquid crystal driving semiconductor chip 15 'with respect to the other power supply electrodes 19a to 19b and the power supply electrodes 21a to 21b, and the line on which the power supply electrodes 19a to 21a and the power supply electrodes 19b to 21b are arranged. Is different from the liquid crystal driving semiconductor chip 15 described in the first and second embodiments in the point that it is provided, but the other configuration is the same.

In other words, the resistance electrodes 20a and 20b and the resistance electrodes 22a and 22b are
It is provided on each corner side of the liquid crystal driving semiconductor chip 15 'with respect to the other electrodes formed on 5'.

On the other hand, the liquid crystal driving semiconductor chip 15 '
Is mounted and connected, as shown in FIG.
The electrode 5 provided at the outermost end corresponds to the electrode position of the liquid crystal driving semiconductor chip 15 'in FIG.
The electrodes 9a and 9b and the electrodes 9a and 10b are provided outside the lines where the electrodes 8a and 7b and 8b are located.
b is higher than the line on which the other electrodes 7a to 7b and 8a to 8b and the electrode 5 provided at the outermost end are arranged.
Embodiment 1 in that it is provided on the outer peripheral side of a transparent substrate 3 ′
2 is different from the liquid crystal driving semiconductor chip 15 described in 2, but the other configuration is the same.

When the liquid crystal driving semiconductor chip 15 'shown in FIG. 7 is mounted on the transparent substrate 3' of FIG. 6, the resistance 16a of the resistance Ra in the liquid crystal driving semiconductor chip 15 '
.Bump-shaped resistance electrodes 20a and 20 connected to 16b
b is connected to the electrodes 9a and 9b via the power supply wiring 12b.

Further, the electrodes 8a and 8b are similarly connected via the power supply wiring 12a. When the liquid crystal driving semiconductor chip 15 'shown in FIG. 7 is mounted on the transparent substrate 3', the liquid crystal driving The bump-shaped resistance electrodes 22a and 22b connected to the resistances 16a and 16b having the resistance value Ra in the semiconductor chip 15 'for use are connected to the electrodes 10a and 10b via the power supply wiring 12a.

The electrode 5 of FIG. 6 is connected to the liquid crystal display device of FIG. 7 when the semiconductor chip 15 ′ for driving the liquid crystal is mounted on the transparent substrate 3 ′. 17 (17a to 17e) which are terminal electrode bumps for use
Are connected via the control wiring 12c.

On the other hand, the electrode 6 shown in FIG. 6 corresponds to the electrode 18 which is a liquid crystal driving electrode bump of the semiconductor electrode connected when the liquid crystal driving semiconductor chip 15 'is mounted on the transparent substrate 3'. And is connected to a signal wiring 11 connected to a liquid crystal display element (not shown).

When the liquid crystal driving semiconductor chip 15 ′ of FIG. 7 is mounted on the transparent substrate 3 ′ of FIG. 6, as shown in FIG.
The liquid crystal display device 1 'is connected to the respective electrodes formed at the corresponding positions.

Further, in the sectional view taken along the line GG ′ of the liquid crystal display device 1 ′ shown in FIG. 8, as shown in FIG. 9, the liquid crystal driving semiconductor chip 15 ′ is formed of a transparent liquid crystal display device 1 ′. The electrodes are electrically connected to each other by the substrate 3 ′ and the anisotropic conductive adhesive 30. For example, the electrode 18, which is the output electrode of the liquid crystal driving semiconductor chip 15 ', is electrically connected to the electrode 6 on the transparent substrate 3' via an anisotropic conductive adhesive 30.

The electrode 6 is connected to the liquid crystal display element of the liquid crystal display 1 'via the signal wiring 11.

Further, the sealing material 31 is provided on the upper transparent substrate 2.
Are provided around the edge of the lower transparent substrate 3 ′. The transparent substrates 2, 3 ′ are bonded together, and a liquid crystal 32 is sealed between the transparent substrates 2, 3 ′.

As described above, when the liquid crystal driving semiconductor chip 15 'of FIG. 7 is mounted on the transparent substrate 3', the resistors 16a and 16b in the liquid crystal driving semiconductor chip 15 '
Electrodes 20a, 20b, 22a, 22b connected to
Are arranged on the outer peripheral side of the liquid crystal driving semiconductor chip 15 ′ with respect to the electrodes formed on the other liquid crystal driving semiconductor chips 15.

Thus, the liquid crystal driving semiconductor chip 1
When 5 ′ is mounted on the transparent substrate 3 ′ by the thermocompression bonding head 40, when pressure is not applied more to the side B where the resistance electrodes 22a and 22b are located than the other side, that is, the liquid crystal driving semiconductor chip 15 ′ And the pressing surface 40a of the thermocompression bonding head 40 have an angle θ, and the liquid crystal driving semiconductor chip 1
When 5 ′ is mounted on the transparent substrate 3 ′ fixed to the panel support 41, as shown in FIG.
0a>19a>17d>21a> 22a, FIG. 10 (b)
20b>19b>17e>21b> 22
The pressure applied to each electrode decreases in the order of b, and the electrodes 10a
The connection resistance between the resistance electrodes 22a and between the electrode 10b and the resistance electrode 22b further increases.

Here, the connection resistance between the electrode 10a and the resistance electrode 22a is Rx1, the connection resistance between the electrode 10b and the resistance electrode 22b is Rx2, and the current flowing through the power supply wiring 12a is Ix.
a ', the power supply voltage applied to the power supply wiring 12a is Va, the voltage applied to the power supply wiring 12b is ground (0 V), the display drive circuit in the liquid crystal drive semiconductor chip 15' (excluding the resistors Ra and Rb). Is assumed to be Ic ′.

The current Ia 'flowing through the power supply wiring 12a when the connection between the liquid crystal driving semiconductor chip 15' and the transparent substrate 3 'is defective is represented by the following equation.

Ia '= Va / (Ra + Rx1) + Va /
(Rb + Rx2) + Ic ′ On the other hand, when the electrode 10a is normally connected to the resistance electrode 22a, the current Ia is represented by the following equation.

Ia = Va / Ra + Va / Rb + Ic Thus, it is understood that Ia-Ia '> 0.

That is, the liquid crystal driving semiconductor chip 15 ′
Is mounted at an angle θ with respect to the transparent substrate 3 ′, the electrode side where the pressure is low tends to have poor connection.

Semiconductor chip 1 for driving liquid crystal of the present embodiment
In 5 ', since the resistive electrodes 20a, 20b, 22a, and 22b connected to the resistors 16a and 16b are arranged on the outermost peripheral portion, the liquid crystal driving semiconductor chip 1 is tilted to one side.
When 5 ′ is mounted, poor contact is likely to occur between the electrodes on the low pressure side. If there is a poor contact portion, a resistance is generated at that portion, so that the resistance increases and the current flowing through the resistor 16a or 16b decreases.

As described above, the current Ia 'is smaller than the current Ia when a normal connection is made. Furthermore, the resistance electrodes 22a and 22 described in the first and second embodiments are used.
b is disposed on the same line as the electrode 18 and the power supply electrodes 21a and 21b, or
The current Ia ′ in the present embodiment is smaller than the current Ia ′ at the time of poor connection when 0b is disposed on the same line as the electrode 17 and the power supply electrodes 19a and 19b,
Incomplete connection between the liquid crystal driving semiconductor chip 15 'and each electrode formed on the transparent substrate 3' can be more reliably detected.

Similarly, when the pressure applied to the side A of the semiconductor chip 15 ′ for driving the liquid crystal by the thermocompression bonding head 40 on the side A where the resistance electrodes 20 b and 22 b mounted on the transparent substrate 3 ′ is low, Driving semiconductor chip 1
5 ′ and the pressing surface 40a of the thermocompression bonding head 40 have an angle θ.
When the semiconductor chip 15 ′ for driving the liquid crystal is mounted on the transparent substrate 3 ′ fixed to the panel support 41, as shown in FIG. 11A, 20 a> 17 d> 1
9a>17a>17b>17c>19b>17e> 20
b, as shown in FIG. 11B, 22a>17d> 21
a>18a>18b>18c>21b>17a> 22b
In this order, the pressure applied to each electrode decreases.

Therefore, between the electrode 10b and the resistance electrode 22b,
The connection resistance between the electrode 9b and the resistance electrode 20b is Ry1 · Ry
Assuming that the current is 2, the current Ia ′ flowing through the power supply wiring 12a is expressed by the following equation.

Ia '= Va / Ra + Va / (Rb + Ry
1 + Ry2) + Ic '. Thus, the current Ia (= Va / Ra + Va / R) when the electrode 10a and the resistance electrode 22a are normally connected.
The current amount is smaller than (b + Ic). Further, the resistance electrodes 20a and 22a are arranged on an EE 'line (a line parallel to the side C) where the electrode 17d is located, and the resistance electrodes 20b and 22b are located on the FF' where the electrode 17e is located.
Since the current value is smaller than the case where they are arranged on a line (a line parallel to the side A), by measuring the current Ia ', the connection between the liquid crystal driving semiconductor chip 15' and the transparent substrate 3 'is made. Defects can be more reliably detected.

In addition, even if the connection is normal during mounting and connection, if the liquid crystal driving semiconductor chip 15 ′ is mounted and connected diagonally, the connection gradually becomes defective during long-term use after commercialization. There is a problem. However, according to the liquid crystal driving semiconductor chip 15 'of the present embodiment, the resistance electrode 20a
Since 20b, 22a, and 22b are provided at the outermost peripheral side of the liquid crystal driving semiconductor chip 15 ', that is, at the position where connection failure is most likely to occur, the liquid crystal driving semiconductor chip is intentionally liable to cause connection failure. 15 'can be detected to be mounted diagonally, and even a preliminary connection failure that will occur in the future can be found.

As described above, the occurrence of connection failure is more reliably suppressed, and the liquid crystal driving semiconductor chip 15 'having high connection reliability is obtained.
Can be obtained.

As described above, in the first, second, and third embodiments, the case where the display driving device is mounted on the glass substrate via the anisotropic conductive film has been described. However, the present invention is not limited to this. Instead, for example, the present invention can be applied to a case where a display driving device is mounted on a glass substrate using a conductive adhesive. Further, as the substrate, in addition to the glass substrate and the quartz substrate, if an anisotropic conductive film or an adhesive is used, for example, if an adhesive that cures at a low temperature such as a resin that cures by light irradiation is used, a plastic may be used. It is also possible to apply to a substrate.

In the first, second and third embodiments, a liquid crystal display device has been described as a display device. However, the present invention is not limited to this. For example, an EL display device, an electrochromic display device, etc. It is also possible to apply the present invention when the COG method is implemented.

[0137]

As described above, the display driving device according to the present invention includes the resistor not connected to the display driving circuit and the resistance electrodes respectively connected to both ends of the resistor. In some cases, both ends of the resistor are connected to power supply wires having different potentials via a second electrode provided at a position corresponding to the resistor electrode.

Therefore, by measuring the current flowing through the power supply wiring connected to the resistor provided in the display driving device, the first electrode formed on the display driving device and the second electrode formed on the substrate are measured. This is advantageous in that it can be easily determined whether or not the connection with the electrode is defective. Thus, when the connection is defective, the display drive having the poor connection is removed, and the display drive is mounted again, whereby a display drive with high connection reliability can be obtained.

That is, when the first electrode formed on the display driving device and the second electrode formed on the substrate of the display device have a poor connection, the overall resistance value is determined by the resistance of the poor connection portion. Becomes larger. Further, since the resistance value provided in the display driving device is a known value provided as a predetermined value, the current flowing through the power supply wiring when the connection between the first electrode and the second electrode is normal. Can be the specified value. Therefore, when there is a connection failure, the current value flowing through the power supply wiring is smaller than the current value when there is no connection failure, and it is only necessary to compare the current value with the specified value to determine whether the connection is defective. Can be determined.

Further, since it is not necessary to form a wiring pattern for a connection failure test on the substrate to perform the connection resistance test, the area of the frame portion of the substrate does not increase. Therefore, for example, even when the display device according to the present invention is applied to a product such as a liquid crystal television, it is possible to avoid giving a design constraint to the product.

Further, according to the above configuration, the resistance is provided inside the display driving device, and the connection of the display driving device is determined by the change in the value of the current flowing through the power supply wiring formed on the substrate. Is determined, the connection failure can be inspected at the same time in the current inspection step. Therefore, it is possible to omit the conventional inspection process for examining only the connection failure,
The manufacturing efficiency can be improved, and the cost of the product can be reduced.

As described above, the display driving device of the present invention is provided with the resistor having only one end electrically connected to the display driving circuit and the resistance electrode connected to the other end of the resistor. At the time of mounting connection, the resistance electrode to which the other end of the resistor is connected is connected to the power supply having a potential different from the power supply wiring of the display drive circuit to which the one end of the resistor is connected via the second electrode. This is a configuration that is connected to wiring.

Therefore, by measuring the current flowing through the power supply wiring connected to the resistor provided in the display driving device, the first electrode formed on the display driving device and the second electrode formed on the substrate are measured. This is advantageous in that it can be easily determined whether or not the connection with the electrode is defective. Thus, when the connection is defective, the display drive having the poor connection is removed, and the display drive is mounted again, whereby a display drive with high connection reliability can be obtained.

Further, according to the present invention, in the display driving device, the resistance electrode to which one end of the resistor is connected is connected to the power supply wiring of the display driving circuit, and the resistance electrode to which the other end is connected is electrically connected. This is effective for a connection failure inspection when the width of the display driving device is narrow. For example,
When only the connection failure test on one of the resistance electrodes to which the other end of the resistance is connected is sufficient, or when the resistance electrode at one end of the resistance formed on the display driving device cannot be formed, furthermore, the wiring formed on the substrate Even when the pattern cannot be formed up to both ends of the display driving device, a connection failure between the first electrode of the display driving device and the second electrode on the substrate can be detected.

Further, it is more preferable that the resistance electrode is arranged on the outer peripheral side of the line on which the first electrode is arranged.

Therefore, when the display driving device is mounted on the display device using a mounting device such as a thermocompression bonding head, a uniform regular electrode is uniformly applied to each electrode of the display driving device due to the small inclination of the thermocompression head or the like. If no pressure is applied, a poor connection between the first electrode of the display driving device and the second electrode on the substrate of the display device caused by long-term use can also be detected, which is advantageous in cost. Therefore, it is possible to obtain a highly reliable display driving device.

As described above, in the display device of the present invention, the display drive device is provided with the resistor not connected to the display drive circuit and the resistance electrodes respectively connected to both ends of the resistor. At the time of connection, both ends of the resistor are connected to the power supply line having different potentials via a second electrode provided at a position corresponding to the resistor electrode.

Therefore, by measuring the current flowing through the power supply wiring connected to the resistor provided in the display driving device, the first electrode formed on the display driving device and the second electrode formed on the substrate are measured. This is advantageous in that it can be easily determined whether or not the connection with the electrode is defective. Thus, when the connection is defective, the display driving device having the defective connection is removed, and the display driving device is mounted again, whereby a display device with high connection reliability can be obtained.

Further, since it is not necessary to form a wiring pattern for the connection failure inspection on the substrate to perform the connection failure inspection, the area of the frame portion of the substrate does not increase. Therefore, for example, even when the display device according to the present invention is applied to a product such as a liquid crystal television, it is possible to avoid giving a design constraint to the product.

Further, according to the above configuration, the resistance is provided inside the display driving device, and the resistance is provided from the change in the value of the current flowing through the power supply wiring connecting the second electrodes formed on the substrate. Since the connection failure of the display driving device is determined, the connection failure can be inspected simultaneously in the current inspection step. Therefore, the conventional inspection process for examining only the connection failure can be omitted, the manufacturing efficiency can be improved, and the cost of the product can be reduced.

As described above, in the display device of the present invention, the display driving device includes a resistor having only one end electrically connected to the display driving circuit, and a resistor connected to the other end of the resistor. In the mounting connection, the resistance electrode to which the other end of the resistor is connected is connected to the power supply wiring of the display drive circuit to which one end of the resistor is connected via the second electrode. This is a configuration in which power supply lines having different potentials are connected.

Therefore, by measuring the current flowing through the power supply wiring connected to the resistor provided in the display driving device, the first electrode formed on the display driving device and the second electrode formed on the substrate are measured. This is advantageous in that it can be easily determined whether or not the connection with the electrode is defective. Thus, when the connection is defective, the display driving device having the defective connection is removed, and the display driving device is mounted again, whereby a display device with high connection reliability can be obtained.

Further, in the display driving device of the present invention, the resistance electrode to which one end of the resistor is connected is connected to the power supply wiring of the display driving circuit, and the resistance electrode to which the other end is connected is electrically connected. Since it is in the open state, it is effective for a connection failure inspection when the width of the display driving device is small. For example, when only a connection failure test on one resistor electrode side to which the other end of the resistor is connected is required, or when a resistor electrode at one end of the resistor formed on the display driving device cannot be formed, furthermore, the resistor is formed on the substrate. Even if a wiring pattern cannot be formed up to both ends of the display driving device, a connection failure between the first electrode of the display driving device and the second electrode on the substrate can be detected.

In addition, it is more preferable that the resistance electrode is arranged on the outer peripheral side of the display driving device with respect to the line on which the first electrode is arranged.

Therefore, when the display driving device is mounted on the display device by using a mounting device such as a thermocompression bonding head, a small regular inclination of the thermocompression head or the like causes uniform uniform and regular electrodes on the electrodes of the display driving device. When no pressure is applied, a poor connection between the first electrode of the display driving device and the second electrode on the substrate caused by long-term use can be detected, which is advantageous in terms of cost and reliability. The effect that a display device with high display quality can be obtained is obtained.

The method for inspecting a display device according to the present invention is characterized in that, when power is supplied to the display drive device from the power supply wiring to the display device, a current flowing through the power supply wiring is measured, and the first result is determined from the measurement result. This is a method for detecting a connection failure between the first electrode and the second electrode.

Therefore, the connection between the first electrode formed on the display driving device and the second electrode formed on the substrate is performed only by measuring the current flowing through the power supply wiring formed on the substrate. There is an effect that defects can be easily detected.

Further, the connection failure can be easily determined only by measuring the current flowing through the power supply wiring formed on the substrate, so that the connection failure can be inspected simultaneously with the current inspection. Therefore, one of the inspection steps can be omitted, the manufacturing efficiency can be improved, and the cost of the product can be reduced. Further, in a display device in which one resistance electrode to which the other end of the resistor is connected is connected to the power supply wiring of the display driving circuit, the width of the display driving device is narrow, and the connection failure can be inspected. Even in a difficult case, a connection failure inspection can be performed.

[Brief description of the drawings]

FIG. 1 is a plan view of a transparent substrate of a liquid crystal display panel provided in a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a liquid crystal driving semiconductor chip connected to a transparent substrate of the liquid crystal display device of FIG. 1;

3 is a plan view showing a state where the semiconductor chip for driving a liquid crystal of FIG. 2 is mounted on the transparent substrate of FIG. 1;

FIG. 4 is a sectional view taken along line A-A ′ of FIG. 3;

FIG. 5 is a perspective view of a liquid crystal driving semiconductor chip according to another embodiment of the present invention.

FIG. 6 is a plan view of a transparent substrate of a liquid crystal display panel provided in a liquid crystal display device according to still another embodiment of the present invention.

FIG. 7 is a perspective view of a liquid crystal driving semiconductor chip connected to a transparent substrate of the liquid crystal display device of FIG. 6;

8 is a plan view showing a state where the liquid crystal driving semiconductor chip of FIG. 7 is mounted on the transparent substrate of FIG. 6;

9 is a sectional view taken along the line G-G 'of FIG.

FIGS. 10A and 10B are side views showing a process of mounting the liquid crystal driving semiconductor chip of FIG. 7 on a transparent substrate of the liquid crystal display device of FIG. 6 using a thermocompression bonding apparatus.

FIGS. 11A and 11B are side views showing a process of mounting the liquid crystal driving semiconductor chip of FIG. 7 on a transparent substrate of the liquid crystal display device of FIG. 6 using a thermocompression bonding device.

FIG. 12 is a side view showing a step of mounting a conventional liquid crystal driving semiconductor chip on a transparent substrate of a liquid crystal display device using a thermocompression bonding apparatus.

FIG. 13 is a plan view of a transparent substrate of a conventional liquid crystal display device.

[Explanation of symbols]

1 ・ 1 ′ Liquid crystal display panel 2 Transparent substrate (substrate) 3 ・ 3 ′ Transparent substrate (substrate) 5 Electrode (second electrode) 6 Electrode (second electrode) 7a ・ 7b Electrode (second electrode) 8a ・8b electrode (second electrode) 9a / 9b electrode (second electrode) 10a / 10b electrode (second electrode) 11 signal wiring 12 wiring 15/15 'liquid crystal driving semiconductor chip (display driving device) 16a resistance Resistance of value Ra 16b Resistance of resistance Rb 17 Electrode (first electrode) 18 Electrode (first electrode) 19a / 19b Power supply electrode (first electrode) 20a / 20b Resistance electrode 20a (NC) / 20b (NC ) Resistive electrode (not connected) 21a / 21b Power supply electrode (first electrode) 22a / 22b Resistive electrode 30 Anisotropic conductive adhesive 31 Sealant 32 Liquid crystal 35 Wiring 40 Thermocompression head 40a Pressurizing surface 41 Panel support

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09F 9/35 G09F 9/35 F-term (Reference) 2G014 AA01 AB21 AC09 2H088 FA11 HA01 HA02 HA06 MA20 2H092 GA40 GA45 GA49 GA60 NA30 PA01 PA06 5C094 AA41 AA43 BA01 BA43 CA19 EA03 EA04 EA07 5G435 AA17 AA19 BB12 CC09 KK05 KK09 KK10

Claims (7)

[Claims] A first electrode for mounting connection; when the first electrode is mounted and connected on a substrate of a display device, the first electrode is connected to a power source via a second electrode formed on the substrate; In a display drive device connected to wiring and supplied with power, the display drive circuit includes a resistor not connected to the display drive circuit, and resistance electrodes respectively connected to both ends of the resistor. A display driving device, wherein both ends of the resistor are connected to power supply wires having different potentials via a second electrode provided at a position corresponding to the resistor electrode. 2. A display device comprising: a first electrode for mounting connection; when mounted on a substrate of a display device, the first electrode is connected to a power supply via a second electrode formed on the substrate. A display driving device connected to a wiring and supplied with power, comprising: a resistor having only one end electrically connected to the display driving circuit; and a resistance electrode connected to the other end of the resistor. At the time of mounting connection, the resistance electrode to which the other end of the resistor is connected is connected via the second electrode to a power supply line having a potential different from that of the display drive circuit to which one end of the resistor is connected. A display driving device, which is connected to a display device. 3. The display driving device according to claim 1, wherein the resistance electrode is arranged on an outer peripheral side of a line on which the first electrode is arranged. 4. A display driving device having a first electrode for mounting connection, connected to a plurality of power supply wires having different potentials, and connected to the first electrode when mounting the display driving device. A display device including a substrate on which a second electrode is formed, wherein the display driving device includes a resistor that is not connected to the display driving circuit and resistance electrodes respectively connected to both ends of the resistor. A display, wherein at the time of mounting connection, both ends of the resistor are connected to the power supply wiring having different potentials via a second electrode provided at a position corresponding to the resistor electrode. apparatus. 5. A display driving device provided with a first electrode for mounting connection, and a plurality of power supply wirings having different potentials are connected on a substrate on which the display driving device is mounted and connected. A display device comprising: a second electrode connected to the first electrode when the drive device is mounted and connected; wherein the display drive device includes a resistor having only one end electrically connected to the display drive circuit. And a resistor electrode connected to the other end of the resistor. When mounted and connected, the resistor electrode connected to the other end of the resistor has one end connected to the resistor via the second electrode. A display device which is connected to a power supply wiring having a potential different from a power supply wiring of a connected display driver circuit. 6. The display device according to claim 4, wherein the resistance electrode is disposed on the outer peripheral side of the display driving device with respect to a line on which the first electrode is disposed. . 7. A method according to claim 4, further comprising: measuring a current flowing through said power supply wiring when power is supplied to said display drive device from said power supply wiring to said display device.
A method for inspecting a display device, comprising detecting a connection failure between a first electrode and a second electrode from a measurement result.