JPS63128394A - Display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a display device used for various displays.

(Prior Art) In general, a display device using liquid crystal, for example, as shown in FIG. It has a printed circuit board 12 on which electrical parts are attached, an elastic connecting body 13 made of conductive rubber or the like is interposed between them, and the elastic connecting body 13 is compressed appropriately by a fixture 14 and is integrally assembled. Assembling.

The display cell 11 has an upper glass plate 16 and a lower glass plate 17, as shown in FIG.
On the lower glass plate 17, a plurality of X-side display electrodes 19 are formed in parallel by vapor deposition, and on the lower glass plate 17, a plurality of Y-side display electrodes 20 are formed in parallel by vapor deposition. These two upper and lower glass plates 16°11 are the display terminal Fi1 on the X side.
9 and the display electrode 20 on the Y side are combined in parallel with each other at a distance so that they are perpendicular to each other. Furthermore, as shown in FIG. 7, a liquid crystal material 22 is sealed in a space between them, whose entire circumference is sealed by a sealing material 21.

As shown in FIG. 8, the display cell 11 configured in this manner has a display cell I! on the X side. i19 and the display electrode 20 on the Y side constitute a matrix having an intersection 23,
When a certain X-side display electrode 19a and Y-side display electrode 20a are selected and an electric signal is applied to them, their intersection point 2
3a, the liquid crystal material 12 at the intersection 23a is
2 reacts and displays.

Moreover, electrode terminals for external connection are led out from each of the display electrodes 19.20 to the side edges of the corresponding glass plates 16.17. FIG. 9 shows an electrode terminal 19A of the display electrode 19.

Further, the printed circuit board 12 is configured with an electric circuit for controlling the display of the display cell 11 as described above. , as shown in FIG. 9, each type m O
An output terminal 12A is provided corresponding to the N-type terminal 198.

As shown in FIG. 9, the elastic connector 13 has a large number of conductive parts 13b arranged in parallel at the center sandwiched by a pair of side insulating parts 13a through insulating parts 13c. The conductive portion 13b is the electrode terminal 19 of the display cell 11.
^ and the terminals 12A of the printed circuit board 12, which correspond to each other, are conductively connected to each other separately.

The display cell 11 and printed circuit board 12 described above are
As shown in FIG.
are assembled together using a fixture 14 under pressure such that the elastic connecting body 13 is slightly compressed.

When assembling such a display device, it is important to align the electrode terminals 19A on the display cell 11 side and the terminals 128 on the printed circuit board 12 with each other. In order to facilitate such alignment, the width of the electrode terminal 19A on the display cell 11 side is made larger than the width of one display electrode. However, in recent display cells 11, there is a tendency to reduce the display dot pitch, and the spacing between display electrodes 19 must be set small. Therefore, when the width of the electrode terminal 19A is set large as described above, a difference occurs in the length of the electric path 19B from the display electrode 19 to the corresponding electrode terminal 19A, as shown in FIG. That is, the electric path 19 from the outer display electrode 19 to the corresponding electrode terminal 19^
B is drawn out and becomes longer than that at the center.

If the lengths of the electric paths 19B differ in this way, the resistance values thereof will also change significantly, causing a difference in the voltages applied to the intersections 23 shown in FIG. 8, resulting in display unevenness.

(Problems to be Solved by the Invention) As described above, in the conventional device, there is a problem in that display unevenness occurs due to different resistance values of each display electrode.

SUMMARY OF THE INVENTION An object of the present invention is to provide a display device in which display unevenness due to differences in resistance does not occur even if the electrode terminals are made wider than the display electrodes in order to facilitate assembly.

[Structure of the invention]

(Means for Solving the Problems) A display device according to the present invention includes a display cell having a plurality of display electrodes and an electrode terminal provided for each display electrode,
A printed circuit board having terminals for outputting electrical signals to each of the display electrodes in order to display control the display cell, and conductive connection between each terminal of the printed circuit board and the corresponding electrode terminal of the display cell. and an elastic connecting body having a conductive portion, and the resistance values from each terminal of the printed circuit board to the corresponding display electrode are adjusted to be set substantially equal to each other.

(Function) The present invention prevents changes in applied voltage due to differences in resistance values and eliminates display unevenness by setting the resistance values up to each display electrode to be substantially equal.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. The apparatus of the present invention basically has the same configuration as that shown in FIGS. 5 to 11, and corresponding parts will be described with the same reference numerals.

In FIG. 1, an electrode terminal 19A of a liquid crystal display cell 11
An elastic connector 13 is provided between the terminal 12A of the printed circuit board 12 and the corresponding terminal 12A of the printed circuit board 12.

Here, as explained in FIG. 11, the resistance value from the electrode terminal 19A to the display electrode (not shown) is larger on the outside (left side in FIG. 1) than in the center (on the right side in FIG. 1). Therefore, as shown in FIG. 2, the elastic connector 13 makes the pitch of the conductive part 13b sandwiched between the side insulating parts 13a and the insulating part 13c smaller (Pa) on the outside (left side in the figure) and smaller (Pa) on the inside. Now set it thick (Pb).

With this configuration, as shown in FIG.
The number b is greater than the number of conductive parts 13b that are in contact with the electrode terminal 19A at the center (on the right side in the figure).

That is, the conductive portion 13 that contacts the outer electrode terminal 19A
The conductive part 1 has a cross-sectional area b that contacts the central electrode terminal 198.
3b, and the resistance is lower on the outside than in the center. As a result, the total resistance value from the terminal 12A of the printed circuit board 12 to the display electrode becomes a substantially constant value regardless of the center or outer position. Therefore, the voltage applied to the intersection points 23 of the matrix by the display electrodes 19 and 20 shown in FIG. 8 is also constant, and display unevenness does not occur.

In the above embodiment, in order to change the cross-sectional area of the conductive portion 13b,
The pitch of the conductive parts 13b was changed to change the number of conductive parts 13b in contact with the electrode terminal 19A, but as shown in FIG. 3, the pitch (Pa) (Pb) was kept constant, and instead , the width direction of the outer (left side in the figure) conductive part 13b is,
The width may be larger than the width tub of the conductive portion 13b at the center (on the right side in the figure). In this way, the outer electrode terminal 19A
The cross-sectional area of the conductive portion 13b in contact with the conductive portion 13b is larger than that at the center, and the resistance value is lowered. Therefore, the total resistance values up to the display electrodes are approximately equal to each other, and display unevenness does not occur.

In all of the above embodiments, the conductive portion 13b of the elastic connection body 13
The resistance value is adjusted by changing the cross-sectional area of the conductor 19B, but as shown in FIG. Good too. That is, the short electric path 19B in the center (on the right side in the figure) with less routing has a small cross-sectional area. In contrast,
The long electric path 19B on the outside (on the left side in the drawing), which is often routed, has a large cross-sectional area depending on its length. In this way, the resistance values of the electric circuit 19B portions become almost equal to each other, and the corresponding display electrode 19 is connected to the terminal 12A of the printed circuit board 12.
The total resistance values up to this point are almost equal to each other, and display unevenness does not occur.

〔Effect of the invention〕

As described above, according to the present invention, the resistance values from each terminal of the printer 1 to the substrate to the corresponding display electrode of the display cell are set to approximately equal values, thereby preventing display unevenness due to differences in resistance values. It is possible to perform high-quality display.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the display device according to the present invention, FIG. 2 is a perspective view showing the elastic connector used in FIG. 1, and FIG. 3 is another embodiment of the present invention. 4 is a plan view showing an electrode pattern of a display cell used in still another embodiment of the present invention; FIG. 5 is an exploded perspective view showing the configuration of a general display device; 6 is an exploded perspective view of the display cell shown in FIG. 5, FIG. 7 is a sectional view showing the assembled body, FIG. 8 is a plan view showing a matrix of the same display electrodes, and FIG. FIG. 10 is an exploded perspective view showing the relationship among the display cell, printed circuit board, and elastic connector shown in the figure; FIG. 10 is a sectional view showing the assembled state of FIG. 9; FIG. 1 is a plan view showing an electrode pattern of a conventional display cell. 11...Display cell, 12...Printed circuit board, 12A...
Terminal, 13... Elastic connection body, 13b... Conductive part, 19
... Display electrode, 19A ... Electrode terminal.

Claims (3)

[Claims] (1) A display cell having a plurality of display electrodes and an electrode terminal provided for each display electrode, and a printed circuit board having a terminal for outputting an electric signal to each of the display electrodes to control the display of the display cell; an elastic connecting body having a conductive part that conductively connects each terminal of the printed circuit board and the corresponding electrode terminal of the display cell, and each resistor from each terminal of the printed circuit board to the corresponding display electrode. A display device characterized in that the values are adjusted to be approximately equal to each other. (2) Display cells with different resistance values from each display electrode to the corresponding electrode terminal are used, and the resistance value is adjusted by mutually changing the cross-sectional area of the conductive part for each display electrode of the elastic connector. A display device according to claim 1. (3) The display device according to claim 1, wherein the resistance value is adjusted by mutually changing the cross-sectional area of the electric path from each display electrode of the display cell to the corresponding electrode terminal.