JPH0667195A - Element for display - Google Patents

Abstract

PURPOSE:To obtain an element for display which is capable of easily miniaturizing display picture pitches and does not cause the difference in display due to the difference in the resistance of wiring for the external input. CONSTITUTION:Two circuits 1a and 1b (2a and 2b) for mounting an IC for driving exist in juxtaposition with one side 3a (other side 3b) of a display part 3 and extendingly in parallel with each other. Wiring 4(5) for display are connected to the circuit 1a (2a) for mounting the IC for driving and the circuit 1b (2b) for mounting the IC for driving alternately and sequentially from the one side. The circuits 1a and 2b (2a and 2b) for mounting the IC for driving and a bus-line 6 (8) for the external input are the same shape and are connected with wirings 7a and 7b (9a and 9b) for the external input arranged in juxtaposition. In the above-mentioned manner, the array pitch of the wiring 4 (5) for display is reduced, thereby reducing the pitch of the display picture. Further, the resistances of the wirings 7a and 7b (9a and 9b) for the external input are made to be the same, thereby eliminating the difference in display between respective display pictures.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display element in which a driving integrated circuit (hereinafter, integrated circuit is abbreviated as IC) mounting circuit is formed on the periphery of a display portion.

[0002]

2. Description of the Related Art Recently, as a mounting structure of a liquid crystal display element,
The driving IC is mounted on the driving IC mounting circuit provided on the periphery of the display section.
A COG (chip on glass) method for directly mounting a driver has been put into practical use.

In the COG method, as shown in FIG. 5, for example, two lines are formed along one side 33a of the display unit 33.
The drive IC mounting circuits 31a and 31b are arranged in series in the scanning direction. Further, the end of the display wiring 32 in the display unit 33 is connected to the connection terminal 36 of each of the driving IC mounting circuits 31a and 31b. Then, the individual driving IC drivers (not shown) mounted on the driving IC mounting circuits 31a and 31b carry out scanning by dividing the driving IC mounting circuits 31a and 31b into blocks. It is common to perform display operations in the order in which they are arranged.

Further, in the COG method as shown in FIG. 5, it is necessary to externally supply an external signal such as a power source or a control signal to the driving IC driver. Therefore, this external signal is transmitted from the external input bus line 35 controlled by using a through hole or the like to the driving IC by the external input wiring 34a.
The driving IC mounting circuit 3 provided to the mounting circuit 31a and further arranged in series from the driving IC mounting circuit 31a
1b by an external input wiring 34b.

[0005]

With the widespread use of liquid crystal display devices in recent years, liquid crystal display devices are required to have higher-definition display, and the arrangement pitch of display pixels, that is, the wiring pitch of the display wirings, is increased. Miniaturization is in progress. Along with this, it is necessary to further reduce the arrangement pitch of the connection terminals of the drive IC mounting circuit and further increase the drive frequency of the drive IC driver.

For example, in FIG. 5, the pitch of the display pixels is "a", the pitch of the connection terminals 36 is "b", and the driving frequency of the driving IC driver is "f". here,
If the display pixel pitch is set to "a / 2" with the same area of the display section 33, the number of connection terminals provided in the drive IC mounting circuits 31a and 31b is doubled as shown in FIG. It is necessary to set the pitch to "b / 2".

Thus, in order to miniaturize the display pixel pitch, it is necessary to miniaturize the connection terminal pitch. However, there is a limit to the miniaturization of the connection terminal pitch, and there is a problem that the display pixel pitch cannot be miniaturized.

Further, in the case of the mounting structure of the liquid crystal display element by the COG method and the bus line method in which the external input wiring is controlled for each side of the display portion, FIGS.
As shown in FIG. 2, the two driving IC mounting circuits 31a and 31b arranged in series along one side 33a of the display unit 33 and the bus line 35 are connected in series by the external input wirings 34a and 34b. . Therefore, a difference in wiring resistance for external input occurs between the driving IC drivers arranged in series along the scanning direction. Therefore, there is a problem that a display difference (contrast shift or the like) occurs in the display pixel in the scanning direction.

Therefore, an object of the present invention is to easily miniaturize the arrangement pitch of the display pixels without reducing the connection terminal pitch of the drive IC mounting circuit, and display difference due to the difference in wiring resistance for external input. It is to provide a display element that does not cause

[0010]

In order to achieve the above object, the display element according to the first aspect of the present invention has a driving I on the periphery of the display portion.
In a display element formed by forming a C mounting circuit, a plurality of driving IC mounting circuits are formed along at least one side of the display section, and a plurality of display wirings in the display section are provided. Is connected to each of the plurality of drive IC mounting circuits in order in a predetermined order from the display wiring located on one side of the display section.

The display element of the second invention is the display element of the first invention, wherein each of the plurality of drive IC mounting circuits is formed along at least one side of the display section. Are arranged in parallel with each other, the driving IC mounting circuits extending in parallel with each other in parallel with the sides of the display section and having the same shape. It is characterized in that each of the plurality of external input wirings is connected to the external input bus line.

[0012]

According to the first aspect of the invention, there are a plurality of drive IC mounting circuits formed along at least one side of the display portion, and each of the plurality of drive IC mounting circuits has the above display. The ends of the plurality of display wirings in the section are repeatedly connected in a predetermined order through the connection terminals in order from the display wirings located on one side of the display section. Therefore, by driving each of the driving IC drivers mounted on the plurality of driving IC mounting circuits formed along the side of the display section in the predetermined order with the phases thereof shifted, the matrix type electrode is driven. Are sequentially driven from the electrodes located on the one side.

At this time, assuming that the arrangement pitch of the connection terminals of each of the driving IC mounting circuits is "b" and the driving frequency of the driving IC driver mounted on the driving IC mounting circuit is "f", The arrangement pitch of the display wirings connected to the connection terminals is "b / (number of driving IC mounting circuits)" and the driving frequency is "f × (number of driving IC mounting circuits)".
Becomes Therefore, the matrix-type electrode having a miniaturized array pitch can operate at a high frequency without reducing the connection terminal pitch of the individual drive IC mounting circuits or increasing the drive frequency of the individual drive IC drivers. Driven.

Further, in the second invention, a plurality of driving ICs are formed along at least one side of the display section.
Each of the mounting circuits extends in parallel with each other on the side of the display unit. And a plurality of driving ICs
Each of the mounting circuits is connected to the external input bus line by each of a plurality of external input wirings formed in the same shape and arranged in parallel. Therefore, there is no resistance difference between the external input wirings for supplying an external signal to each driving IC mounting circuit, and each display driven by each driving IC driver mounted on each driving IC mounting circuit. There is no display difference between the picture elements, and they are displayed stably.

[0015]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. In this embodiment, a liquid crystal display element will be described as an example of the display element. FIG. 1 is a schematic view of a liquid crystal display device of this embodiment. This liquid crystal display element has two driving ICs arranged in parallel on one side 3a of the display unit 3.
The mounting circuits 1a and 1b extend parallel to each other. Further, two driving IC mounting circuits 2a and 2b extend in parallel with each other on the other side 3b of the display unit 3.

The ends of the display wirings 4, 4, ... Arranged in parallel with the other side 3b of the display unit 3 are connected to the connection terminals of the two driving IC mounting circuits 1a, 1b in order from one side. They are connected alternately. On the other hand, the ends of the display wirings 5, 5, ...
The driving IC mounting circuits 2a and 2b are alternately connected to the connection terminals.

From the external input bus line 6 for supplying an external signal to the drive IC mounting circuit 1a, the drive IC is connected.
The external signal input wiring 7a is drawn out and connected to the center of the mounting circuit 1a. Similarly, the external signal input wiring 7b is drawn out and connected to the center of the driving IC mounting circuit 1b. Then, each external signal input wiring 7a, 7
b have the same shape and are arranged in parallel. On the other hand, from the external input bus line 8 that supplies external signals to the driving IC mounting circuits 2a and 2b, two external signal input wirings 9a and 9b having the same shape and arranged in parallel are formed. Each of them is pulled out and connected to the center of the driving IC mounting circuit 2a or the driving IC mounting circuit 2b.

FIG. 2 is a partial view of the vicinity of the drive IC mounting circuits arranged in parallel on the side 3a of the display portion 3 in the liquid crystal display element of FIG. Now, in the driving IC mounting circuit 1a, the connection terminals 10a, 10a, ... Have pitch "b" (see FIG. 5).
The same as the pitch of the conventional IC connection terminals shown in FIG. Similarly, connection terminals 10b, 10b, ... Are arranged at a pitch "b" in the drive IC mounting circuit 1b. Then, as described above, the display wirings 4, 4, ... Are provided between the connection terminals 10a, 10a, ... Of the drive IC mounting circuit 1a and the connection terminals 10b, 10b, ... Of the drive IC mounting circuit 1b. They are connected alternately from one side.

Therefore, the arrangement pitch of the display wirings 4, 4, ... Is b / 2. That is, by using the driving IC mounting circuits 1a and 1b in which the connection terminals are arranged at the same connection terminal pitch "b" as the conventional liquid crystal display element shown in FIG. 5, the arrangement pitch of the display wirings 4, 4, ... Can be halved to "b / 2". In other words, it is possible to easily miniaturize the arrangement pitch of the display wirings and thus the display pixel pitch without reducing the connection terminal pitch of the drive IC mounting circuit.

At this time, the external signal input wirings 7a and 7b drawn from the external input bus line 6 to the centers of the driving IC mounting circuits 1a and 1b have the same shape and are parallel to each other. It is arranged. Therefore, the driving IC mounting circuit 1 connected to each external signal input wiring 7a, 7b
The display difference due to the resistance difference of the external input wirings 7a and 7b does not occur between the display pixels driven by the individual driving IC drivers mounted on a and 1b.

Further, when driving the liquid crystal display device having the above-mentioned structure, as described above, the driving IC mounting circuits 1a, 1b,
Since the connection terminal pitch of 2a, 2b is the same as the connection terminal pitch "b" of the conventional liquid crystal display element shown in FIG. 5, the driving I mounted on each of the driving IC mounting circuits 1a, 1b, 2a, 2b.
The drive frequency of the C driver may be the same drive frequency "f" as in the case of the conventional liquid crystal display element shown in FIG. However, FIG.
As shown in, the connection terminal 1 of the driving IC mounting circuit 1a
The display wiring 4 connected to 0a and the display wiring 4 connected to the connection terminal 10b of the driving IC mounting circuit 1b are arranged with a phase difference of "b / 2". Therefore, the driving IC mounted on the driving IC mounting circuit 1a
Driver drive timing and drive IC mounting circuit 1b
It is necessary to deviate from the drive timing of the drive IC driver mounted in the above by the time "1 / 2f".

As described above, in the above embodiment, the two driving IC mounting circuits 1a and 1b formed along one side 3a of the display portion 3 of the liquid crystal display element are parallel to each other and parallel to the side 3a. While extending to the other side 3 of the display section
two driving IC mounting circuits 2a formed along b,
2b are arranged in parallel with the other side 3b and extend parallel to each other. Then, at the connection terminals of the drive IC mounting circuits 1a, 1b or the drive IC mounting circuits 2a, 2b, the display wirings 4, 4, ... Or the display wirings 5, 5 ,.
Are sequentially and alternately connected from one side of the display unit.

Thus, the drive IC mounting circuit 1a,
The display wiring pitch can be halved by doubling the number of the display wirings 4 and the number of the display wirings 5 without reducing the arrangement pitch of the connection terminals 1b, 2a, 2b. Therefore, it is possible to easily deal with the miniaturization of the display pixel pitch accompanying the higher definition of the display.

Further, as described above, the two driving IC mounting circuits 1a, 1 formed along the respective sides of the display section 3 are provided.
b or two drive IC mounting circuits 2a and 2b extend in parallel to each other along the scanning direction. As a result, for example, the external signal input wirings 7a and 7b for supplying external signals to the driving IC mounting circuits 1a and 1b can be formed in the same shape and arranged in parallel. Therefore, the driving I
The external signal input wiring resistances for the C mounting circuits 1a and 1b are the same, and the display pixels driven by the driving IC driver mounted in the driving IC mounting circuit 1a and the driving IC mounting circuit 1b are mounted. A display difference does not occur between the display pixels driven by the driving IC driver.

FIG. 3 shows the driving IC mounting circuit 1a, 1b of FIG. 2 by integrating the driving IC driver mounted on the driving IC mounting circuit 1a, 1b shown in FIG.
An embodiment in which 1b is integrated will be shown. In this case, if there is a margin around the display unit 3, the drive IC mounting circuit 1a ′,
If 1b 'is further extended to increase the number of connection terminals, the liquid crystal display element can be made even higher definition.

In each of the above embodiments, each driving IC mounting circuit formed along one side of the display section and each driving IC mounting circuit formed along the other side are formed on the same substrate. ing. However, the present invention is not limited to this. That is, as shown in FIG. 4, a driving IC formed in parallel along one side 13a of the display unit 13.
Mounting circuits 11a, 11b and driving IC mounting circuits 12a, 12b formed in parallel along the other side 13b of the display unit 13
May be formed on different substrates, that is, the substrate 20 and the substrate 21.

In each of the above embodiments, the number of drive IC mounting circuits arranged in parallel along each side of the display portion is two.
However, the number may be three or more. At this time, n driving IC mounting circuits having the same number of connection terminals are arranged in parallel, and the arrangement pitch of the display wirings connected to all the connection terminals is set to "b" and scanning is performed at the frequency "f". In this case, the connection terminal pitch of each drive IC mounting circuit is “b × n”, and the drive frequency of each drive IC driver is “f / n”. That is, as the number of driving IC mounting circuits extending in parallel along each side of the display section increases, the driving frequency in each driving IC driver can be reduced and the connection terminal pitch can be increased.

Further, in each of the above embodiments, the driving I formed along each of the one side and the other side of the display section.
A plurality of C mounting circuits are provided and arranged in parallel on each side and in parallel with each other. However, the present invention is not limited to this, and it does not matter if only the drive IC mounting circuit formed along any one side is formed as described above. Further, although the liquid crystal display element is described as an example in each of the above-described embodiments, the present invention is not limited to this. The point is that any display element can be driven by the matrix electrodes.

[0029]

As is apparent from the above, in the display element of the first invention, the ends of the plurality of display wirings in the display section are arranged in order from the display wirings located on one side of the display section. Since the plurality of drive IC mounting circuits formed along at least one side of the display section are repeatedly connected in a predetermined order via the connection terminals, the connection terminals in each of the drive IC mounting circuits are connected. The arrangement pitch of the display wirings, that is, the arrangement pitch of the display electrodes can be easily made fine without reducing the arrangement pitch of. Therefore, it is possible to easily deal with the miniaturization of the display pixel pitch as the display becomes finer.

In the display element of the second invention, each of the plurality of drive IC mounting circuits formed along at least one side of the display section is arranged in parallel with the side of the display section. The external input bus lines are connected to each of the driving IC mounting circuits by a plurality of external input wirings formed in the same shape and arranged in parallel with each other. The resistance of each external input wiring is the same. Therefore, there is no display difference due to the difference in wiring resistance for external input between the display pixels driven by the driving IC driver mounted in each driving IC mounting circuit.

[Brief description of drawings]

FIG. 1 is a schematic view of a liquid crystal display element in one embodiment of the display element of the present invention.

FIG. 2 is a partial view of the liquid crystal display element shown in FIG.

FIG. 3 is a partial view of an embodiment different from FIGS. 1 and 2.

FIG. 4 is a schematic view of a liquid crystal display element in an example different from FIGS. 1 to 3.

FIG. 5 is a partial view of a conventional liquid crystal display device.

6 is a partial view of a case where the display pixel pitch of the liquid crystal display element of FIG. 5 is doubled by a conventional method.

[Explanation of symbols]

1a, 1b, 1a ', 1b', 2a, 2b, 11a, 11b, 12a, 12b
... Driving IC mounting circuit, 3, 13 ... Display section, 4, 5 ... Display wiring, 6, 8 ... External input bus line, 7a, 7b, 9a, 9b
... External input wiring, 20, 21 ... Substrate.

Claims (2)

[Claims] 1. A display element comprising a drive integrated circuit mounting circuit formed on the periphery of a display unit, wherein a plurality of drive integrated circuit mounting circuits are formed along at least one side of the display unit. The end of the plurality of display wirings in the display section, in order from the display wiring located on one side of the display section, a connection terminal to each of the plurality of driving integrated circuit mounting circuit. A display element, which is repeatedly connected in a predetermined order through a display element. 2. The display element according to claim 1, wherein each of the plurality of drive integrated circuit mounting circuits formed along at least one side of the display section has a corresponding side of the display section. A plurality of driving integrated circuit mounting circuits, which are arranged in parallel with each other and extend in parallel with each other, and which are formed in the same shape and arranged in parallel. A display element characterized in that it is connected to an external input bus line by each of the wiring for wiring.