JPS62283320A - Electronic connecting device - Google Patents

Abstract

PURPOSE:To make excellent connections by connecting output electrodes to corresponding substrate electrodes formed on a substrate and forming a series of pattern wires on the reverse side of output electrodes of a drive substrate for supplying signals for driving in parallel to the output electrodes. CONSTITUTION:The series of pattern wires 51 and 52 are formed on the reverse side of the output electrodes Fn of the drive substrate 32 for supplying the driving signals in parallel to the output electrodes Fn. Similar wires 53-58 are formed on other drive substrates 33-35. The pattern wires 51-58, therefore, reinforce the output electrode parts of the flexible drive substrates in their pitch directions. Namely, even when the drive substrates expand or shrink owing to variations in temperature, humidity, etc., that is suppressed by the pattern wires 51-58. Consequently, the output electrodes Fn of the drive substrate 32 are connected excellently and accurately to substrate electrodes An of an array substrate 31.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Object of the Invention] (Field of Industrial Application) The present invention relates to an electrical connection device that improves a drive board.

(Prior Art) Recently, display devices using liquid crystals or electroluminescence (EL) have been used for television displays, graphic displays, etc., and have a large capacity.

High-density active matrix liquid crystal display devices are being actively developed and put into practical use. This type of display device provides high-contrast display without crosstalk.
A semiconductor switch is used as a means for driving and controlling each pixel. As a semiconductor switch, single crystal S
There are MO3 type FETs formed on i-substrates, TPTs formed on transparent substrates, which are capable of transmissive display, and can easily be made large in area.

FIG. 4 shows an equivalent circuit of an active matrix liquid crystal display device. In the figure, (Xi), (i=1.
2, 3. -m) are multiple data lines, (Yi),
(j■1,2,3°...n) are multiple gate lines perpendicular to this, and TPT (thin film transistor) is installed at each intersection of these data lines (Xi) and gate lines (Yi).
10 are configured. The drain electrodes of TPTIO are connected to data lines (Xi) for each column, and the gate electrodes of TPTIO are connected to gate lines (Yj) for each row. Reference numeral 11 denotes transparent pixel electrodes, each connected to the source electrode of the TPT, and a liquid crystal 13 is sandwiched between the transparent pixel electrode 11 and the transparent counter electrode 12. The gate line (Yj) corresponds to a scanning line,
It is connected to the scanning circuit 15. In addition, the data line (Xi) is
Hold circuit 1 that supplies display signals in -horizontal line units
Connected to 6. Hereinafter, these scanning circuits 15, hold circuits 16, etc. will be collectively referred to as drive circuits. Figure 5 shows
The structure of a liquid crystal display device is schematically shown. TFT is
On the array substrate 21, a transparent substrate 22 is arranged in a matrix shape using semiconductor technology and has a transparent counter electrode 12 facing thereon. A liquid crystal 13 is sealed between the side substrates. Further, color filters are also formed on the transparent substrate 22 corresponding to each pixel electrode. Note that 23 is a spacer, and 24 is a polarizing plate.

Assume that in the above liquid crystal display device, voltage is now supplied to the gate line (Yl) and high level data is supplied to the data line (Xl). Then, the TPT at the intersection of the gate line (Yl) and the data line (Xl) is turned on, voltage is accumulated between the pixel electrode and the transparent counter electrode in this area, the liquid crystal is aligned, and light passes through this area. I can do it. In this way, light passing pixels are selected according to the signal from the data line (Xi), and screen display is possible. Since the gate line (Yj) is scanned at a constant frequency, the voltage accumulated in the pixel electrode section is rewritten at this frequency.

(Problems to be Solved by the Invention) In order to drive the above liquid crystal display device, drive circuits such as a scanning circuit 15 and a hold circuit 16 as shown in FIG. 4 are required. The circuit is formed on a printed wiring board. Therefore, a plurality of substrate electrodes for circuit connection are formed on the periphery of the array substrate 21, and
In response to this, a method is adopted in which a plurality of output electrodes are also formed on the printed wiring board and the two are connected.

Conventionally, a rigid printed wiring board has been used as a board having a drive circuit, but recently there has been a demand for the use of a flexible board in order to downsize the device. However, flexible substrates expand and contract under the influence of temperature, humidity, and the like. Therefore, as shown in FIG.
side substrate electrode (An), (n-1, 2, 3, -=),
Output electrode (Fn) on the flexible substrate 25 side, (n-1
゜2.3. ...) There is a problem in that a pitch shift occurs between the two. If the pitch is misaligned during the manufacturing stage, the two electrodes (An) and (Fn) will not correspond one-to-one, resulting in poor connection or incorrect connection. Figure 6 shows electrodes (An), (Fn)
) shows an example where there is a gap between the two.

Therefore, in this invention, for example, when connecting a drive circuit to a liquid crystal cell part, even if a flexible substrate is used, there is no pitch deviation between the substrate electrode of the array substrate and the output electrode of the flexible substrate, resulting in high precision and reliability in manufacturing. The purpose of this invention is to provide a highly flexible electrical connection device.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a drive board for supplying drive signals by connecting corresponding output electrodes to a plurality of board electrodes formed on the board. A pattern wiring is formed on the back side of the output electrode in a series along the direction in which the output electrodes are arranged in parallel.

(Function) By forming the pattern wiring as described above, the flexible board is reinforced, especially at its output electrode portion, eliminating pitch deviation between the output electrode and the board electrode, resulting in a good connection. It is something that can contribute to the

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, and numeral 31 is an array substrate as explained in FIG. Drive boards 32.33, 34.35
is installed. In this case, the drive boards 32, 3
3, 34.degree. 35 precisely connects each output electrode to a substrate electrode extending from the liquid crystal cell section 40 to the periphery of the array substrate 31.

FIG. 2 shows an enlarged view of the connection between the output electrode (Fn) of the drive board 32 and the substrate electrode (An) of the array board 31. As can be seen from this figure, in this invention,
The back side of the output electrode (Fn) of the drive board 32 for supplying drive signals,
pattern wiring 51 in a series along the parallel direction of n)
．． 52 is formed. Although two pattern wirings are shown in this drawing, the number is not limited to this.

Similar wiring 53 for other drive boards 33, 34, 35
, 54.55, 56, 57.58 are formed.

Therefore, the above-mentioned pattern wirings 51 to 58 reinforce the output electrode portion of the flexible drive board in the pitch direction. In other words, even if the drive board tries to expand or contract due to changes in temperature, humidity, etc., the pattern wirings 51 to 58 will suppress this. As a result, when connecting the output electrode (F n) of the drive board 32 and the substrate electrode (An) of the array board 31 in correspondence, a good connection and accurate connection can be achieved without any pitch deviation between the two. Obtainable. There are various methods for connecting the electrodes, such as thermocompression bonding, sandwiching solder and applying heat, and bonding, and the present invention can exhibit its effects no matter which method is adopted.

Furthermore, when connecting pattern wiring of adjacent drive boards, for example, as shown in FIG.
Connection patterns 61 and 62 are formed in advance on 1, and the connections are made by soldering. In this way, for example, the pattern wiring 52
, 54, 56, and 58, it can be used as a repair line when a line inside the liquid crystal cell 40 is broken.

For example, if there is a disconnection part 70 in the data line (Xl) as shown in FIG. 3, connect the electrode (Fl) or (A1) to the pattern wiring 52 and connect this part to the is connected to the electrode through this pattern wiring. In this way, even if there is a disconnection 70, data is supplied to some elements by bypassing the pattern wiring, so all the elements to which data should be supplied by this data line (Xl) It will work normally.

[Effects of the Invention] As explained above, the present invention can improve precision by eliminating pitch deviation between the substrate electrode and the output electrode of the flexible substrate even when a flexible substrate is used, for example, when connecting a drive circuit to a liquid crystal cell section. It is possible to provide an electrical connection device that is highly reliable in manufacturing.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a plan view showing main parts of the device of the invention, and Fig. 3 is a plan view showing an example of use of the device of the invention. 4 is a diagram showing an equivalent circuit of a matrix type liquid crystal display device, FIG. 5 is an assembled sectional view of a conventional liquid crystal display device, and FIG. 6 is an explanatory diagram of a drive board connection part of a conventional liquid crystal display device. . 31...Array board, 32-35...Drive board, 51-59...Pattern wiring, (An>...: Substrate electrode, (Fn)... Output electrode.

Claims (1)

[Claims] A drive board for connecting corresponding output electrodes to a plurality of board electrodes formed on the board to supply drive signals, and a back side of the output electrodes of the drive board, comprising: , and pattern wiring formed in series along the direction in which the output electrodes are arranged in parallel.