JP2820168B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a connecting portion for connecting a liquid crystal display panel to a circuit board on which liquid crystal driving electronic components are mounted in a liquid crystal display device.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view showing a structure of a conventional liquid crystal display device disclosed in, for example, Japanese Patent Application Laid-Open No. 62-238684, and FIG. 5 is a sectional view of the liquid crystal display device in FIG.
In the figure, reference numeral 1 denotes a liquid crystal display panel, two transparent glass plates 2 and 3 having a plurality of transparent electrode films formed on one surface, and a sealing agent 4 for holding and bonding these glass plates 2 and 3 at a predetermined interval. And a liquid crystal 5 sealed between two glass plates 2 and 3.
And a polarizing plate 6 disposed on the two glass plates 2 and 3. At an end of the glass plate 2, a connection terminal 7 for a pixel electrode extracted from each pixel electrode is formed. ing. Reference numeral 8 denotes a liquid crystal driving IC which is an electronic component for supplying a liquid crystal driving signal to a pixel electrode. Reference numeral 9 denotes a film carrier which is a circuit board formed by forming a copper foil pattern on a polyimide film and having the liquid crystal driving IC 8 mounted thereon. , Connected to the output lead of the IC 8 and connected to one terminal 10 protruding from the film carrier 9 and the input lead of the IC 8,

[0003]

Since the conventional liquid crystal display device is composed of the liquid crystal display panel 1, the film carrier 9, and the hard printed circuit board 12 as described above, the outer shape of the device is smaller than the liquid crystal display area. There is a disadvantage that the area becomes large. In addition, a plurality of film carriers 9 must be separately connected to the liquid crystal display panel 1 and the hard printed circuit board 12, resulting in poor productivity. Further, if at least one of the plurality of film carriers 9 is obliquely connected to the liquid crystal panel 1, the connection position between the film carrier 9 and the hard printed circuit board 12 is shifted, and the connection between the two becomes impossible. there were. Furthermore, since the conventional liquid crystal display device has a structure in which the liquid crystal display panel 1 and the hard printed circuit board 12 are bridged by the film carrier 9, at the stage of assembling the device where these are not fixed to a cabinet or the like. Due to vibration during transportation or the like, a force due to the load of the liquid crystal display panel 1 is applied to the connection portion. When the liquid crystal display panel 1 is enlarged, the connection terminals 7 and 10 of the pixel electrodes are connected to each other. , The connection between the connection 14 of the bus line 13 and the connection terminal 11, and the connection between the lead terminal of the IC 8 and the wiring are cut off. The present invention has been made in order to solve such a problem, and it is an object of the present invention to provide a liquid crystal display device that is compact and has high connection reliability with reduced material and production costs.

[0004]

A liquid crystal display device according to the present invention comprises a plurality of connection terminals for supplying a drive voltage to a pixel electrode, a connection portion formed in parallel with these connection terminals , and a bent portion from the connection portion. A plurality of connection portions and a plurality of bus lines formed in parallel with each other . The connection terminal and the connection portion
Disposed adjacent in the direction along the outer periphery of the transparent substrate a liquid crystal display panel, and has an input lead and an output lead connected to the connection portion of the connection terminals and bus lines of the pixel electrodes, for supplying a driving voltage to the pixel electrode electronic components are those having a circuit board mounted.

[0005]

According to the liquid crystal display device of the present invention, the connection portion of the bus line is formed in parallel with the plurality of connection terminals of the pixel electrode, and the lead portion bent from the connection portion is provided. Since the liquid crystal display panel and the film carrier can be connected together without crossing each other, productivity can be improved, and a rigid printed circuit board is not required. Performance can be improved.

[0006]

An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, a plurality of connection terminals 10 and 11 are arranged on a rectangular film carrier 9 in parallel with each other and protruding from the film carrier 9. In addition, a plurality of connection terminals 7 extending from pixel electrodes are formed on the rectangular liquid crystal display panel 1 in parallel with each other. further,
A bus line 13 is provided along the outer periphery of the liquid crystal display panel 1, and the bus line 13 is provided near the connection terminal 7 in a direction perpendicular to the outer periphery toward the center, and then bent in parallel to the outer periphery. Then, it is bent at a right angle toward the outer peripheral portion, and the connection portion 14 is formed in parallel with the connection terminal 7. After that, a lead portion 15 which is bent further from the connection portion 14 and extends again along the outer periphery is provided, and a plurality of these connection portions and lead portions are formed in parallel. Under such a configuration, the connection portion 14 and the connection terminal 11 of the bus line 13 and the connection terminal 7 and the connection terminal 10 of the pixel electrode are opposed to each other via an anisotropic conductive film or solder, and are heated. The two are connected by thermocompression by pressing.

As described above, in the liquid crystal display device according to the present invention, the mounting portion of the liquid crystal display panel 1 includes the connection terminals 7 of the pixel electrodes of the liquid crystal display panel 1 and the connection portions 14 of the bus lines 13. Next to the direction along the outer periphery of the transparent substrate.
Since the connection terminals 10 and 11 of the film carrier 9 are arranged and connected on the connection portions 7 and 14 in parallel , the connection can be made at a time.
As the performance increases, the configuration becomes compact. Also,
There is no need to provide a crossover portion such as a multilayer wiring in the bus line portion of the liquid crystal display panel 1, and simple and highly reliable wiring can be realized. Further, during assembly, the force acting on the connection between the liquid crystal display panel 1 and the film carrier 9 is small due to the load of the film carrier 9, and the connection does not break even if the liquid crystal display panel 1 is enlarged. . When connecting a chip component such as a chip capacitor as a noise filter to the bus line 13, the bus line
When the material 13 is made of a material such as aluminum which is difficult to solder, it is sufficient to solder the material to the film carrier 9 made of copper. I can do it.

FIG. 2 shows the structure of a main part of another embodiment. The wiring connected to the input leads of the IC 8 is divided and routed on the left and right sides of the IC 8 on the film carrier 9 to thereby form the film carrier 9. Are reduced in the vertical direction to enable compact mounting.

FIG. 3 shows a third embodiment, in which a connecting portion 14 and a connecting terminal 11 of a bus line 13 and a connecting portion of a connecting terminal 7 and a connecting terminal 10 of a pixel electrode are connected to the front side of the liquid crystal display panel 1. And the film carrier 9 is bent in a U-shape along the side surface of the liquid crystal display panel 1, and the film carrier 9 is fixed to the liquid crystal display panel 1 so that the IC 8 is located on the back side of the liquid crystal display panel 1. Things. With such an arrangement, the size of the device can be further reduced.

In a liquid crystal display device in which a thin film transistor is formed in a part of the liquid crystal display panel, since the source electrode and the drain electrode are formed of aluminum, the workability is improved if the bus line 13 is also formed of aluminum at the same time. Will be. On the other hand, if the conduction resistance of the bus line 13 increases, the image will be adversely affected. To prevent this, in the case of the 10-inch liquid crystal display panel 1, when the width of the bus line 13 is 300 μm, The line 13 needs to have a thickness of 0.9 μm. With such a thickness, there is no problem in forming the line 13 at the same time as the source electrode and the drain electrode.

[0011]

As described above, in the liquid crystal display device according to the present invention, the plurality of connection terminals for supplying the drive voltage to the pixel electrodes, the connection portions formed in parallel with these connection terminals , and the connection portions It comprises a bent lead portion , and has a bus line in which a plurality of these connection portions and lead portions are formed in parallel , wherein the connection terminal and the connection portion are
Disposed adjacent in the direction along the outer periphery of the transparent substrate LCD <br/> panel, and has an input lead and an output lead connected to the connection portion of the connection terminals and bus lines of the pixel electrodes, drive the pixel electrodes since the electronic component supplying the voltage so as to comprise a circuit board mounted, thereby improving productivity, miniaturization of the apparatus, saving of the material cost, improvement in connection reliability is effective to be implemented.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a plan view showing a main part of a liquid crystal display according to another embodiment of the present invention.

FIG. 3 is a sectional view showing a main part of a liquid crystal display device according to a third embodiment of the present invention.

FIG. 4 is a perspective view showing a configuration of a conventional liquid crystal display device.

FIG. 5 is a sectional view showing a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2, 3 Glass plate 4 Sealant 5 Liquid crystal 6 Polarizer 7 Pixel electrode connection terminal 8 Liquid crystal drive IC 9 Film carrier 10, 11 Wiring connection terminal 13 Bus line 14 Bus line connection 15 Bus line Lead part of

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Kohei Adachi 8-1-1 Tsukaguchi Honcho, Amagasaki City Mitsubishi Materials Corporation Materials Research Laboratory (56) References JP-A-61-250672 (JP, A) JP-A JP-A-61-203485 (JP, A) JP-A-3-83019 (JP, A) Japanese Utility Model Application Sho-62-104285 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G02F 1 / 1345

Claims (1)

(57) [Claims] A plurality of pixel electrodes formed on a transparent substrate using a transparent conductive film, and extended from the pixel electrodes;
A plurality of connection terminals for supplying a driving voltage to each of the pixel electrodes, are formed on the outer peripheral portion of the plurality of connection terminals bent from the connection portion and the connecting portion and which is formed parallel to these connection terminal leads And a bus line in which a plurality of the connection portions and the lead portions are formed in parallel.
And the connection terminal and the connection portion extend along the outer periphery of the transparent substrate.
The liquid crystal display panel disposed adjacent to the direction, and has an upper Kise' <br/> connection terminals and the upper Kise' connected plurality of input leads to the connection part and output leads, supplying a driving voltage to the pixel electrode A liquid crystal display device comprising a circuit board on which electronic components are mounted.