JPH01152425A - Structure of external fetching terminal - Google Patents

Abstract

PURPOSE:To utilize an emptier space on a substrate while holding a minimum gap between an external fetching terminal and its adjacent drawing line by connecting plural drawing lines between the terminal of a 1st row arranged inside close to a liquid crystal display element and connecting the terminals of a 2nd row to the end parts of the drawing lines. CONSTITUTION:The external fetching terminal is constituted of two rows, the 1st row close to the display side consists of external fetching terminals 13A-13C... and the 2nd row is constituted of external fetching terminals 15A-15D.... Two drawing lines 14A, 14B for externally fetching the 2nd row are connected between the external fetching terminals 13A, 13B of the 1st row and respective drawing lines 14A, 14B are respectively connected to the external fetching terminals 15A, 15B. Namely, the external fetching terminals 15A, 15B of the 2nd row are arranged in a wide space part of a lower glass 11. Consequently, the empty space on the substrate can be effectively utilized and mounting density can be improved.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an external lead-out terminal structure, and in particular, to a large dot matrix liquid crystal display element having a very large number of external lead-out terminals and a small external lead-out terminal pinch. The present invention relates to an external lead-out terminal structure suitable for such applications.

(Prior Art) In general, a liquid crystal display element is constructed by sealing a liquid crystal material between two electrode substrates on which transparent electrodes are formed, and is configured to be driven by applying a voltage to the transparent electrodes. It is.

In this case, the method of connecting the liquid crystal display element and the external drive circuit is to place a conductive rubber called zebra rubber between the wiring between the external terminal of the liquid crystal display element and the printed circuit board, and to connect the liquid crystal display element and the printed circuit board. Conductivity is established by crimping zebra rubber, or by thermocompression bonding a heat seal on the external terminal of the liquid crystal display element.

However, in liquid crystal display elements such as large dot matrix liquid crystal display elements and liquid crystal televisions, which have a small display area and a large number of display pixels, the number of external output terminals is large (and the pitch of the external output terminals is small). Therefore, there is a very high possibility that a contact failure will occur between adjacent external output terminals.

Therefore, as a method of reducing the terminal pitch, the following terminal arrangement is used.

FIG. 2 is a configuration diagram of such a conventional external extraction terminal, and FIG. 2(a) is a plan view of the external extraction terminal.
FIG. 2(b) is a sectional view taken along the line BB in FIG. 2(a).

As shown in these figures, external extraction terminals 5A, 5B, . . . , 6A are led out from the liquid crystal display element.

There is a method of arranging 6B... in two columns. That is, the terminals of the lead wires are alternately distributed between the external lead-out terminals in the first row and the external lead-out terminals in the second row, which are close to the liquid crystal display section. For example, odd numbered lines are arranged in the first column, and even numbered lines are arranged in the second column.

(Problems to be Solved by the Invention) However, in the method of arranging the external extraction terminals shown in FIG.
, 6B... Lead wires 4A, 4B...
...and the first row of external take-out terminals 5A, 5B...
The gap between terminals 5A and 4A becomes very narrow,
I was envious of the problem that there is a high possibility of poor contact between 4A and 5B, 5B and 4B, etc.

The present invention eliminates the above problems and maintains the minimum gap between the external center terminal and the adjacent lead wire.
It is an object of the present invention to provide an external lead terminal structure that makes more use of the vacant space on the board.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides two rows of external extraction terminals that are connected to a lead line at the terminal end of a board and have a width wider than the width of the lead line. In the external lead-out terminal structure comprising:
A plurality of lead wires are provided between the rows of terminals, and the second row of terminals are arranged at the ends of the lead wires.

(Function) According to the present invention, since it is configured as described above, it is possible to effectively utilize the empty space on the board while maintaining the minimum gap between the external lead terminal and the adjacent lead wire, and the mounting density can be increased.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

The first is a configuration diagram of an external extraction terminal showing an embodiment of the present invention, FIG. 1(a) is a plan view of the external extraction terminal, and FIG. 1(b) is an A of FIG. -A sectional view.

In the figure, 11 is a lower glass constituting a liquid crystal display element;
Reference numeral 12 indicates the upper glass, and one end surface of the glass is shown. The external output terminals are composed of two rows, and the first row near the display side has external output terminals 13A, 13B, 13C, . . . , and the second row has external output terminals 15A, 15B, 15C.

Consists of 15D...

As shown in the figure, two narrow lead wires are led out between the first row of external lead-out terminals, and the second row of wide external lead-out terminals are arranged at the tips of the lead wires. It has become so.

That is, two lead wires 14A and 14B are provided between the first row external lead terminal 13A and the next external lead terminal 13B, and the lead wire 14A is used for the second row external lead. The terminal 15A and the external lead wire 14B are respectively connected to the external lead terminal 15B. In other words, the second row external extraction terminal 15A,
15B is provided in a wide open area of the lower glass 11.

Here, the terminal arrangement of the present invention and the conventional terminal arrangement will be compared and studied.

External extraction terminal 13A in FIG. 1 of the present invention.

Terminal width W+ of 13B = 0.1 ur, gap Cz between external output terminal 13A and lead wire 14A = 0.1
tm, width Wt of lead lines 14A and 14B =0.0
5in+, the gap between the lead wires, for example, the gap Gt between the lead wires 14A and 14B = 0.05 m, and when taking out 720 terminals, approximately (W, +G, +w, +G, +Wt +Q , )x (72
0/3) = (0,1+ 0.1+0.05+0.0
5+0.05+0.1) X240 =0.45X2
40 = 108 (m).

In addition, in the case of the conventional terminal arrangement shown in FIG. 2, the terminal width w of the external extraction terminals 5A, 5B...6A, 6B...=o, i is the width of the lead line wz=0.05. Dragon,
Gap G+ between lead wire and external lead terminal
=0.1 Ilm, for example, to extract 720 signals, approximately (Wl +G, +w, +G+) X720 /2
= (0,1+ 0.1+0.05+0.1) X3
60 = 126mm, that is, 720 with the conventional terminal arrangement
It takes about 126 dragon lengths to extract the book signal,
The terminal arrangement method of the present invention requires only about 108 dragon lengths. That is, the terminal arranging method of the present invention is more advantageous than the conventional terminal arranging method. In FIGS. 1 and 2, the width W1 of the external take-out terminal is, for example, when the connection medium is
In the case of a seal, it is determined by taking into consideration the reliability of the minimum connection pitch of the heat seal and errors in alignment of the terminal portion and the heat seal. The gap G1 is determined in consideration of errors such as resolution of the minimum connection pinch of the connection medium and alignment of heat seals, etc. The width W2 of the lead line is determined by taking into consideration the resolution of the lead line pattern and the impedance of the lead line, but normally WA is smaller than the width W of the external lead terminal (it is possible to do so. Although determined by the minimum pitch resolution of the medium etc., it can be made smaller than the gap G.Gap G
, is larger than the gap G2 because it is necessary to take into account alignment error distribution of the connection medium, etc. more fully than the gap G2. In Figure 2, terminal 6A
.

If the terminal width of 6B is Wl and the gap between terminals 6A and 6B is 03, then G, =G, +W.

It becomes ten GI, and G3 is larger than G1. That is, in FIG. 2, the gap G in the first column is where the possibility of poor contact between adjacent devices is greatest. 1st
In the figure, the width of the output terminal in the second row is Wl, 1
If the gap between 5A and 15B is 04. The gap between 15B and 15C is G, then Wl +G4 +WI +G
5 =W, +Q, +W, +Q, +w, +G, From this, G4 +GS =2G+ + (2Wz +Gz)
V/+= 2 X O, 1+ 2 Xo, 05+
0.05-0.1=0.25G4=GS, then a
, =cs =0.125, which is larger than Gl.

FIG. 3 is a configuration diagram of an external extraction terminal showing another embodiment of the present invention, FIG. 3(a) is a plan view of the external extraction terminal, and FIG. 3(b) is a plan view of the external extraction terminal. C-C! lj!
There is a cross-sectional view.

In this embodiment, the number of external lead-out terminals in the first row is 1, and the number of external lead-out terminals in the second row is 3.

That is, the width of the external extraction terminal 23A on the lower glass 21 is W8, the width of the extraction line 24A is WZ, the gap between the external extraction terminal 23A and the extraction line 24A is GI, the external extraction terminals 25A and 25B, 25B and 25C, and 25C and 2.
Assuming the gap of 5D... to be 01, Wl = Q, l Tsuru.

When c, = 0.1 Seal, W, = 0.05 Yoshin, in order to take out 720 signal lines, approximately (Wl +C+ +W, +C+ +W+ +G,)X
(720/4)=0.6X180=108 cranes, which is more advantageous than the conventional 126 cranes shown in FIG. The width W2 of the lead line is set to 1/2 of the width W of the lead terminal in FIGS. 1 and 3, but the width W2 of the lead line is set to be smaller than 1/2 of the width WI of the lead terminal. In this case, the embodiment shown in FIG. 1 has a slight advantage over the embodiment of FIG. In any case, the width W2 of the lead line is the width W of the lead terminal,
The method of the present invention shown in FIGS. 1 and 3 is more advantageous than the conventional method shown in FIG.

In addition, in the above embodiment, the external lead terminal structure of the liquid crystal display board was explained, but - the external lead terminal structure of the board on which fishing electronic components are mounted, IC (integrated circuit),
It can also be applied to the external lead terminal structure of an LED head.

Furthermore, the present invention is not limited to the above embodiments,
Various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) As described above in detail, according to the present invention, there are provided two rows of external lead-out terminal groups that are connected to the lead line at the terminal end of the board and whose width is wider than the width of the lead line. In the external lead terminal structure, a plurality of lead lines are provided between the terminals in the first row on the inner side near the liquid crystal display element, and the terminals in the second row are arranged at the ends of the lead lines. By effectively utilizing the empty space on the board while maintaining the minimum gap between the external lead terminal and the adjacent lead wire, it is possible to further increase the packaging density.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an external extraction terminal showing an embodiment of the present invention, FIG. 2 is a configuration diagram of a conventional external extraction terminal, and FIG. 3 is a configuration diagram of a conventional external extraction terminal.
The figure is a configuration diagram of an external extraction terminal showing another embodiment of the present invention. 11, 21... Lower glass, 12.22... Upper glass, 13A, 13B, 13c, 15A, 15
B, 15G, , 15D, 23A. 25A, 25B, 25C, 25D...External extraction terminal, 14A, 14B, 14C, 14D, 24A, 2.4
B, 24C...Leader line. Patent applicant Oki Electric Industry Co., Ltd.

Claims (1)

[Claims] In an external lead-out terminal structure comprising two rows of external lead-out terminals that are connected to a lead line at the terminal end of a substrate and are wider than the width of the lead line, An external lead terminal structure in which a plurality of lead wires are provided between the first row of terminals, and a second row of terminals are arranged at the ends of the lead wires.