JP2001356706A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in conventional technique that a liquid crystal unit is connected to a circuit board of a instrument, and other circuit board is separately formed in this liquid crystal unit, for attaining the miniaturization of display devices for a portable telephone or the like. SOLUTION: The display device has a display element which a substrate, the display element is the display device connected to the circuit board, and the substrate is connected directly to the circuit board. Besides, the substrate is made from plastics. Besides, an electrode takeoff connection is formed in the substrate and the substrate is pinched from front and back surfaces by the electrode takeoff connection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display element used for a portable telephone or the like.

[0002]

2. Description of the Related Art Representative examples of display elements include a liquid crystal display element and an EL display element. These display elements perform display by applying a voltage to a display layer sandwiched between substrates. Here, a liquid crystal display element will be described as a typical example. In a liquid crystal display device, liquid crystal is sandwiched between two substrates, on which a transparent electrode and a reflective electrode for applying a voltage are formed. In order to apply an electric signal to the electrodes of this substrate, as shown in FIGS.
First, a flexible substrate 202 is thermocompression-bonded to 201, and a printed circuit board 203 of a liquid crystal module is connected to the other of the flexible substrate 202 by thermocompression. On this printed circuit board, there is provided a connector 205 for taking out a tape electric wire.
6 was connected. That is, a liquid crystal module is formed up to a printed circuit board connected to a liquid crystal panel and a flexible board, and this is connected to a mobile phone by a parallel tape wire.

[0003]

The connection at multiple stages as described above increases the capacity of the device and has a problem that the device cannot be miniaturized.

[0004] It is an object of the present invention to provide a display device which can be mounted in a small size and can reduce the size of equipment.

[0005]

In order to solve the above problems, a display device of the present invention has a display element having a substrate,
The display element is a display device connected to a circuit board,
The substrate is directly connected to the circuit board, and an electrode lead-out portion is formed on the substrate, and the electrode lead-out portion sandwiches the substrate from both sides.

Further, the present invention is characterized in that the electrode take-out part is soldered to the circuit board.

Further, the present invention is characterized in that the electrode take-out portion is inserted into a socket formed on the circuit board.

Further, the present invention is characterized in that the display element is a liquid crystal display element.

Further, the present invention is characterized in that the display element is an EL display element.

Further, the display element has two substrates, and an electrode extraction portion is formed only on one of the substrates.

Further, a voltage applying means is formed on the two substrates, and a means for electrically connecting the voltage applying means of the other substrate to the voltage applying means of the substrate connected to the circuit board is provided.

According to another aspect of the present invention, there is provided a display device having a substrate, wherein the display device is a display device connected to a circuit board, and the display element has an adhering means for adhering to the circuit board. This is a display device.

Further, the present invention is characterized in that the substrate has flexibility.

Further, the present invention is characterized in that the substrate is made of plastic.

Further, according to the present invention, the thickness of the substrate is 0.5 m
m or less.

Further, the present invention is characterized in that the bonding means is an adhesive.

Further, the present invention is characterized in that the bonding means is a double-sided tape.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a display device according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1) When a liquid crystal display element is connected to a mobile phone, a liquid crystal module is connected to a circuit board of the mobile phone. This liquid crystal module also has a printed circuit board on which a liquid crystal drive circuit is formed, and is connected to a substrate of a liquid crystal display element via a printed circuit board on which metal wiring is formed on a plastic film called a flexible board. Was.

In the present embodiment, a metal electrode lead-out portion is formed at the end of the substrate, and the substrate is sandwiched and fixed by this, thereby connecting to the electrode on the substrate of the liquid crystal panel. It is possible to connect directly to a printed circuit board on which a circuit such as a mobile phone is formed. As a result, a compact mounting was realized.

A plurality of electrode patterns are formed on the substrate constituting the liquid crystal panel, and these are extended to the end surface of the substrate. According to this electrode pattern, a metal electrode lead-out portion was attached to the end face of the substrate as shown in FIG. 1, and this was sandwiched and fixed from above and below. As a result, a metal terminal could be formed on each of the plurality of electrodes formed on the substrate of the liquid crystal panel. The present invention is characterized in that electrode terminals are formed on a substrate, and when connecting a metal terminal to a printed circuit board, it may be soldered to the printed circuit board, or may be sandwiched between sockets arranged on the printed circuit board. Good.

A plastic substrate is suitable for the substrate of the liquid crystal panel. Although the electrode mounting portion is sandwiched and fixed from above and below, if the substrate is a glass substrate, the glass may be broken. Since the plastic substrate was relatively flexible and hard to break, this problem was hardly observed.

Although a flexible film substrate is effective in the present invention, a glass substrate is not impossible. The glass substrate has features such as high transparency and high performance of the conventional device.

In the present invention, a conductive transparent electrode is formed on the lower plastic substrate, and an electrode terminal is formed thereon. A similar conductive electrode is also provided on the upper substrate, and an electrode terminal may be formed thereon. At this time, the electrodes are taken out from at least two sides.

Therefore, the present invention has realized a method of collecting electrode lead-out portions on one substrate and forming an electrode lead-out portion on one side. Although electrode patterns are formed on the upper substrate and the lower substrate, a method of connecting the electrodes of the upper substrate to the electrodes of the lower substrate has been formed inside the liquid crystal panel. As a result, the electrodes of the upper substrate were once connected to the lower substrate, and the electrode pattern of the lower substrate was taken out at the end surface of the lower substrate. As a result, only the lower substrate can be connected to the printed circuit board. As a result, the number of steps for forming a connection can be reduced.

TN system, OCB system, VA system, ST
In the N type or the like, since a voltage is applied between the upper and lower substrates, it is necessary to apply a voltage to both substrates. For this reason, in order to reduce the number of connection points, it is necessary to collect electrode leads on one substrate. However, if the voltage applying means is formed only on one side substrate as in the case of the IPS type liquid crystal display element, it is not necessary to treat the electrode wiring on the lower substrate.

The present invention is not limited to a liquid crystal display device. The display device may be an EL display device, a reflection display device or a transmission display device.

(Embodiment 2) As in Embodiment 1,
In a system in which a liquid crystal display element is directly connected to a circuit board without using a liquid crystal module, it is desirable to simplify the method of fixing the liquid crystal display element. This is to reduce the size and weight of the device and to reduce the number of parts.

Therefore, in the present invention, a system in which a liquid crystal panel is adhered directly to a circuit board, and a system in which a liquid crystal substrate is bonded is realized.

Here, even when glass having a thickness of 1.1 mm is used as in the prior art, it is possible to bond the glass. However, in practice, it was necessary to finely adjust the arrangement of the liquid crystal, and this had to be removed in the process. Also, when it is found by inspection of the product that this is a defect, it is necessary to peel off the liquid crystal display element. In this case,
In the case of using the conventional glass liquid crystal display element, there was a problem that the substrate was broken and broken. This is because the glass does not have flexibility and is easily broken.

Therefore, in the embodiment of the present invention, a plastic substrate having flexibility is used as the substrate of the liquid crystal display element, and this is adhered to the circuit board. The bonding is performed by bonding means 102
This can be an adhesive or a double-sided tape.

In the present invention, it is preferable that the substrate is flexible.
This was more effective as the thickness of the substrate was smaller. When the thickness of the substrate was 0.5 mm or less, almost no problem of cracking occurred, and when the thickness was 0.2 mm or less, workability was extremely good.

[0033]

As described above, according to the present invention, it is possible to provide a display device in which the size of the device is reduced.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram illustrating a configuration of a liquid crystal display device according to Embodiment 1 of the present invention.

FIG. 2 is a conceptual diagram showing a configuration of a conventional liquid crystal display device.

FIG. 3 is a conceptual diagram showing a configuration of a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Electrode extraction part 102 Adhesion means 201 Substrate 202 Flexible substrate 203 Liquid crystal unit circuit board 204 Tape wire 205 Connector 206 Equipment circuit board

Continued on the front page F term (reference) 2H092 GA45 GA50 GA54 GA55 MA31 MA34 NA27 5E344 AA28 BB02 BB04 CD18 CD29 DD08 DD16 EE12 5G435 AA18 BB05 BB12 EE37 EE38 EE42 EE43 LL07

Claims (15)

[Claims] A display device connected to a circuit board, wherein the substrate is directly connected to the circuit board, wherein the display element is connected to the circuit board. A display device, wherein an electrode take-out portion is formed. 2. The display device according to claim 1, wherein said electrode take-out portion sandwiches the substrate from both sides. 3. The display device according to claim 1, wherein said substrate is made of plastic. 4. The display device according to claim 1, wherein said electrode take-out portion is soldered to said circuit board. 5. The display device according to claim 1, wherein said electrode take-out portion is inserted into a socket formed on said circuit board. 6. The display device according to claim 1, wherein said display element is a liquid crystal display element. 7. The display device according to claim 1, wherein said display element is an EL display element. 8. The display device according to claim 1, wherein the display element has two substrates, and only one of the substrates has an electrode extraction portion. 9. A voltage applying means is formed on the two substrates, and the voltage applying means of the substrate connected to the circuit board has means for conducting the voltage applying means of the other substrate. Item 10. The display device according to Item 8. 10. A display having a display element having a substrate, wherein the display element is a display device connected to a circuit board, and wherein the display element has an adhesive means for adhering to the circuit board. apparatus. 11. The display device according to claim 10, wherein said substrate has flexibility. 12. The display device according to claim 10, wherein said substrate is made of plastic. 13. The display device according to claim 10, wherein said substrate has a thickness of 0.5 mm or less. 14. The display device according to claim 10, wherein the bonding means is an adhesive. 15. The display device according to claim 10, wherein the bonding means is a double-sided tape.