JPH04120517A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To easily measure the packaging resistance of a flexible PCB and to simplify the control of a production process by providing a bus line which electrically short-circuits at least two packaging terminals at the end of a signal supply wiring. CONSTITUTION:The packaging terminal 8 on a TFT array substrate 1 is constituted of the flexible PCB 4 in order to supply a signal to a driver IC 3 for driving. The signal is supplied from the outside by packaging and connecting one terminal per one kind of signal line through the packaging terminal. The signal supplied from the outside is transmitted to the respective drivers IC 3 for driving through the bus line 6 on the TFT array substrate 1. Furthermore, the bus line 10 for electrically short-circuiting between the packaging terminals at the end of the bus line 6 is provided on the TFT substrate 1. Therefore, the packaging and connecting resistance of the flexible PCB 4 is measured just by connecting an ohmmeter to the connector of the flexible PCB 4 immediately after the flexible PCB 4 is packaged. Thus, the accurate control of the process is easily accomplished.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the structure of a TPT array substrate of a so-called active matrix type liquid crystal display device that drives a liquid crystal using a nonlinear element.

Conventional technology Liquid crystal display devices (LCDs) have traditionally been used mainly in watches and calculators, but in recent years new application fields include video display fields such as televisions, video monitors, video projection systems, and viewfinders, as well as for computers. In the graphic display field, such as display devices for computer terminals and laptop computers, there is an increasing demand for large-capacity displays such as larger screens and higher density. In response to these demands, full-color, high-definition, high-quality liquid crystal display panels have been realized using a so-called active matrix method in which a nonlinear element is provided for each pixel as a liquid crystal driving method.

In this trend, active matrix type nonlinear elements are formed using semiconductor microfabrication technology, but in order to achieve higher-definition image display and more compact products: LCD panels were developed and put into practical use. Especially the LCD viewfinder.
For LCD panels for high-definition liquid video projects, etc.
Therefore, we are pursuing thorough miniaturization, and currently the method t is thick (there are two methods).

-] is a method using polysilicons as switching elements.

Since the polysilicon method is formed using a high-temperature process, the electron mobility is high and a driver for driving the TPT can be built in, which is advantageous for downsizing the liquid crystal panel. Further, since semiconductor LSI technology and equipment can be shared, miniaturization is also easy.

The other method uses amorphous silicon as a switching element, and since the electron mobility is about an order of magnitude lower than that of polysilicon, it is difficult to incorporate a driving driver. Therefore, in order to achieve miniaturization, the drive driver I
The COG (chip-on-glass) method, which directly mounts C on liquid crystal panels, has been developed and put into practical use.

An example of the structure of the amorphous silicon active matrix substrate of the above-mentioned conventional liquid crystal display device will be explained below with reference to the drawings.

FIG. 2 shows the structure of a conventional liquid crystal display device.

In FIG. 2, I is a TPT array substrate, 2 is a counter substrate,
3 is a driving driver 1c chip, and 4 is a flexible PC for supplying signals from the outside to the driving driver IC.
It is B. 5 indicates an image display section, and 6 indicates a flexible P.
This is a signal supply wiring (hereinafter referred to as a pass line) that supplies a signal from the CB 4 to the driving driver IC 4.

FIG. 3 schematically shows an electrical wiring diagram of a conventional liquid crystal display device.

A TFT array is formed in the image display section 5 in a Madrisk shape.

Signals are supplied to the TPT array by a driving driver IC3.

This driving driver IC3 is directly attached to the TFT array base Fi1 using the COG (chip-on-glass) method.
They are electrically connected and mounted by mounting terminals 7 on the array toe board. Signals are supplied to this drive driver T C3 by the flexible PCB 4 from a, b, c, d, e, which constitutes the mounting terminal group 8 on the TFT array board 1.
One terminal per type of signal line is connected via mounting terminals f, g, and h, and is supplied from the outside. This externally supplied signal is transmitted to each driving driver Ic3 by a pass line 6 on the TFT array substrate 1.

Reference numeral 9 is arranged at the end of the flexible PCB 4, and is a group of connector connection terminals for connecting to an external power source and a control section, and the surface is generally treated with solder plating.

The input impedance to this driving driver IC is required to be extremely small, and in particular, the resistance component of the mounting must be controlled to between several ohms and tens of ohms, otherwise reliability problems will occur.

Problems to be Solved by the Invention However, in the above configuration, in order to carry out process control of the connection resistance of the mounted terminal part, it is necessary to use analysis equipment such as a blower and control it on a panel other than the manufactured product. In addition, there is a problem in that the panels that are produced require a large number of production man-hours and incidental work, such as visually checking the connection status using a microscope or the like.

The present invention solves the above-mentioned problems and aims to provide an active matrix type liquid crystal display device.

Means for Solving the Problems In order to achieve the above object, the present invention forms a pass line on a TPT array substrate that electrically shorts at least two terminals of a group of mounting terminals at the end of a signal supply line. It is what it is.

According to the present invention, with the above-described configuration, the mounting connection resistance of a flexible PCB can be measured by simply connecting a resistance meter to the connector of the flexible PCB immediately after the flexible PCB is mounted, and accurate process control can be easily realized based on the measured value. This is how it was done.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 schematically shows an electrical wiring diagram of a liquid crystal display device of the present invention.

In Fig. 1, 1 is the TPT array substrate, 2 is the pair 1iil
Board 3 shows the driver IC for driving. The image display section 5 has a TFT array formed in a matrix.

The signal is supplied to this TPT array by a driving driver IC.
It is done by 3. This driving driver IC3 is C
It is electrically connected to and mounted directly on the TPT array substrate 1 through mounting terminals 7 on the TPT array substrate by the OG (chip-on-glass) method. Signals are supplied to this driving driver TC3 by means of a flexible PCB 4, which constitutes a mounting terminal 8 on the TFT array board l.
One terminal per type of signal line is connected via mounting terminals bc, d, e, f, g, and h, and is supplied from the outside. This signal supplied from the outside is transmitted to each driving driver IC 3 by a lotus line 6 on the TFT array substrate 1. Furthermore, a loop line 10 is used to electrically short-circuit between the mounting terminals e and f on the TPT substrate 1 at the end of the pass line 6.

In this case, the same signal is supplied to mounting terminals e and f. 9
is placed at the end of the flexible PCB 4, and is connected to an external power source,
A group of connector connection terminals for connecting to a control unit, whose surface is generally treated with solder plating. Immediately after this flexible PCB 4 is mounted, mounting resistance can be easily measured by connecting a resistance meter between terminals e and f of the connector connection terminal group 9 at the end of the flexible PCB 4.

As described above, by providing a buff line that electrically shorts between at least two mounting terminals on the TPT board, the mounting resistance can be easily measured by directly connecting the liquid crystal display device that is currently in production to the connector after the actual flexible PCB device is installed. .

Effects of the Invention As described above, according to the present invention, there are provided a TPT array substrate, a driver IC mounted on one of the substrates, a signal supply wiring on the substrate for supplying a signal to the driver IC, and the signal. In a liquid crystal display device having a plurality of mounting terminals connected to the outside at an end of a supply wiring, at least two of the mounting terminals can be made into a flexible PCB by providing a path line that is electrically short-circuited at the end of the signal supply wiring. The mounted resistance can be easily measured, and the production process can be managed extremely easily.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an electrical wiring diagram of a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a schematic perspective view, and FIG. 3 is a schematic diagram of an electrical wiring diagram of a conventional example. 1...TFT array substrate, 2...Counter substrate, 3...Driver IC14...
...Flexible PCB, 5...TFT array matrix section, 6...Pass line, 7...
...Driver IC mounting terminal, 8...
Fluxipru PCB mounting terminal group, 9...Flexible PCB connector connection terminal group, 10...Mount terminal short-circuiting lot line. Name of agent: Patent attorney Akira Okaji et al. 22nd l[
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Claims (1)

[Claims] Thin film transistors arranged in a matrix on one of the substrates in which a liquid crystal is sealed between a pair of substrates, a signal wiring connected to the source electrode of the thin film transistor, and a gate electrode of the thin film transistor. a driver IC mounted on one of the substrates; a thin film transistor array including a gate wiring, a pixel electrode connected to the drain electrode of the thin film transistor; and a driver IC mounted on one of the substrates.
and a plurality of mounting terminals connected to the outside at an end of the signal supply wiring, wherein at least two of the mounting terminals are connected to the outside. A liquid crystal display device characterized in that an end of the signal supply wiring is electrically short-circuited.