JP4693958B2 - Liquid crystal display - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device in which a plurality of lead terminals formed on electrode terminal portions of a liquid crystal display element are connected to a power supply side circuit via a flexible wiring board, and more particularly, to the flexible wiring board. Regarding improvements.
[0002]
[Prior art]
First, an example of a general liquid crystal display element in this type of liquid crystal display device will be described with reference to FIG.
[0003]
FIG. 3 shows a color filter type color liquid crystal display element, which has two transparent substrates 1A and 1B made of a glass-like material and arranged in parallel with a distance therebetween. The outer periphery between the transparent substrates 1A and 1B is sealed with a sealing material 2. Among these, the transparent common electrode 3A is disposed so as to be in close contact with the lower surface of one transparent substrate 1A located above, and the non-display area is covered below the transparent common electrode 3A. A light-shielding film 4 is disposed in
[0004]
An alignment film 6A that controls the alignment of liquid crystal molecules according to the voltage applied between the electrodes is disposed below the light shielding film 4 so as to be in close contact therewith. Further, a polarizing plate 7A is disposed on the upper surface of the glass substrate 1A.
[0005]
On the other hand, a transparent segment electrode 3B is disposed on the upper surface of the transparent substrate 1B located below, and a color filter film 5 is disposed above the transparent segment electrode 3B. Various methods such as a printing method, an electrodeposition method, a dyeing method, and a pigment dispersion method are conventionally known as methods for forming the color filter film 5. Further, an alignment film 6B is disposed on the color filter film 5 so as to be in close contact therewith. Further, a polarizing plate 7B is disposed on the lower surface of the transparent substrate 1B.
[0006]
The liquid crystal 8 is enclosed in a sealed space surrounded by the transparent substrates 1A and 1B and the sealing material 2, and further, the distance between the transparent substrates 1A and 1B is kept accurately and constant. A plurality of spherical or columnar spacers 9 are interposed between the alignment films 6A and 6B.
[0007]
The transparent segment electrode 3B on the upper surface of the transparent substrate 1B is led out on the lower surface of the transparent substrate 1A via a conductive member (not shown) contained in the sealing material 2 and the like. Each lead terminal 3C of each electrode 3A, 3B is formed in the right end part in FIG. 3 of the lower surface of this transparent substrate 1A.
[0008]
On the other hand, an electric circuit 13 is formed on the base film 12 of the flexible wiring board 11 shown in FIG. 5, and the electrodes 3A, 3B are connected to lead terminals 13A formed at the ends of the electric circuit 13. Each lead terminal 3C is connected. Further, an LSI 14 for controlling the liquid crystal display element is mounted on the electric circuit 13 of the flexible wiring board 11. The flexible wiring board 11 is formed with a curved portion 15 to reduce the plane area of the liquid crystal display device, and then extends below the liquid crystal display element 10 as shown in FIG. And connected to the circuit board 16 having rigidity as a power supply side circuit located below the liquid crystal display element 10 via the lead terminals 13B.
[0009]
Further, in the flexible wiring board 11, two portions of the base film 12 that extend in the width direction that is the left-right direction in FIG. Slits 17 and 17 having substantially the same shape are formed. In these slits 17, an electric circuit 13 is arranged so as to communicate with the electric circuit 13 on the base film 12 although not explicitly shown.
[0010]
The electrical circuit 13 on the flexible wiring board 11 is covered with a protective film (not shown).
[0011]
[Problems to be solved by the invention]
By the way, when the flexible wiring board 11 is bent, substantially triangular projections 18 are formed at both side edges in the width direction of the flexible wiring board 11 in the bent portion 15 as shown in FIG. There is. When the projections 18 are formed, the projections 18 may be caught by the casing when the liquid crystal display device is housed in a casing (not shown). If the liquid crystal display device having a liquid crystal display is forcibly stored in the housing, the flexible wiring board 11 may be distorted or the conductor may be peeled off, resulting in poor electrical connection, which may cause a liquid crystal display failure. It was.
[0012]
The present invention overcomes such problems in the conventional device, and can stably store in the housing so that no protrusion is formed on the bent portion of the flexible wiring board, and the liquid crystal An object of the present invention is to provide a liquid crystal display device capable of maintaining a stable display.
[0013]
[Means for Solving the Problems]
In order to achieve the above-described object, the liquid crystal display device according to the first aspect of the present invention is characterized by a pair of small curved portions in which the bent portions are formed at intervals in the longitudinal direction of the flexible wiring board and are bent slightly. a curved portion, the pair of which consists of a flat portion formed between the small curved portion, but-out each notch is formed on both side edges of the curved portion of the base film of the flexible wiring board, wherein the notch is The width is from one small fold part to the other small fold part . And by adopting such a configuration, the portion where the projection is formed by bending is cut off by the notch, so there is no possibility that the projection will be formed, and the housing is stable. Can be done automatically.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of a flexible wiring board of a liquid crystal display device according to the present invention. Note that the same or corresponding components as those of the conventional one described above will be described with the same reference numerals in the drawings.
[0015]
The flexible wiring board 11A of the present embodiment is configured substantially the same as the conventional flexible wiring board 11 described above with reference to FIG. 5, and only differences from the conventional flexible wiring board 11 will be described.
[0016]
Strictly speaking, the bent portions 15 of the flexible wiring board 11 described in FIG. 4 are formed at intervals in the longitudinal direction of the flexible wiring board 11 and are actually bent at two locations 15A. , 15B and a flat portion 15C formed between the two bent portions 15A, 15B.
[0017]
The base film 12 of each of the bent portions 15A and 15B of the flexible wiring board 11A is formed with the slits 17 described in the related art, and the entire width of the base film 12 in each of the bent portions 15A and 15B is formed. Since the length is only about 30% of other portions, the base film 12 of each of the bent portions 15A and 15B is easily bent.
[0018]
Further, notches 20 and 20 each having a substantially semicircular shape are formed on both side edges 19 and 19 of the bent portion 15 of the base film 12 between the slits 17 and 17, respectively. The notches 20 are formed by punching with a mold or a Thomson blade. The shape of each notch 20 may be other shapes such as a substantially U shape or a rectangular shape. Further, the notch 20 is appropriately determined if it does not reach the electric circuit 13, but it is preferable to form the notch 20 at a distance of 1 mm or more from the electric circuit 13 in order to maintain the strength of the flexible wiring board 11A. Furthermore, it is preferable that the width of the cutout 20 which is the longitudinal direction of the flexible wiring board 11 </ b> A straddles the bent portion 15. That is, it should be formed with a width from the bent portion 15A to the bent portion 15B.
[0019]
The flexible wiring board 11A has a curved portion 15 and extends below the liquid crystal display element 10 (FIG. 4) in order to reduce the plane area of the liquid crystal display device. It is connected to a circuit board (not shown) having rigidity as a power supply side circuit located below the display element. Further, the electric circuit 13 on the flexible wiring substrate 11A is covered with a protective film (not shown) including the inside of each slit 17.
[0020]
According to the liquid crystal display device of the present embodiment having the above-described configuration, the flexible wiring substrate 11A is formed with the bent portions 15 including the bent portions 15A and 15B and the flat surface portion 15C. The flexible circuit board 11A is connected to a rigid circuit board located below the liquid crystal display element.
[0021]
As shown in FIG. 2, notches 20 are formed in both side edges 19 and 19 of the bent portion 15, respectively, so that even if the flexible wiring board 11A is bent, protrusions are formed by bending. 6 is formed on both side edges 19 and 19 in the width direction of the flexible wiring board 11A in the bent portion 15 because the portion to be cut off is cut off by the notch 20. As shown in FIG. There is no fear. Therefore, when the liquid crystal display device is used while being housed in a housing (not shown), there is no possibility that the projections may be caught on the housing, so that the liquid crystal display device can be stably housed in the housing. it can.
[0022]
Further, since the slits 17 are formed in the base film 12 of each of the bent portions 15A and 15B, the flexible wiring substrate 11A can be easily bent when forming the bent portions 15A and 15B on the flexible wiring substrate 11A. Can do.
[0023]
In addition, this invention is not limited to embodiment mentioned above, A various change is possible as needed.
[0024]
【The invention's effect】
As described above, according to the liquid crystal display device of the present invention, it is possible to stably store the housing in the casing without forming the protrusion on the bent portion of the flexible wiring board, and to display a good liquid crystal display. Can be maintained.
[0025]
That is, the bent portion is formed from a pair of small bent portions that are formed at a distance in the longitudinal direction of the flexible wiring board and bent slightly, and a plane portion formed between the pair of small bent portions. configured, but-out each notch is formed on both side edges of the curved portion of the base film of the flexible wiring board, since the notch is the width leading to the other of the small curved portion from one of the small curved portion, There is no possibility that the protrusions are formed, and the housing can be stably stored.
[Brief description of the drawings]
FIG. 1 is a plan view of a flexible wiring substrate showing an embodiment of a liquid crystal display device according to the present invention. FIG. 2 is a plan view showing an embodiment of a liquid crystal display device according to the present invention using the flexible wiring substrate of FIG. FIG. 3 is a longitudinal sectional view showing an example of a general liquid crystal display element. FIG. 4 is a front view schematically showing a conventional liquid crystal display device. FIG. 5 is a plan view showing a flexible wiring board in FIG. 6] Plan view of the main part showing the liquid crystal display device of FIG. 4 using the flexible wiring board of FIG.
1A, 1B Transparent substrate 2 Sealing material 3A Transparent common electrode 3B Transparent segment electrode 3C Lead terminal 8 Liquid crystal 9 Spacer 10 Liquid crystal display element 11, 11A Flexible wiring substrate 12 Base film 13 Electric circuit 15, 15A, 15B Curved portion 15C Plane portion 16 Circuit board 17 Slit 19 Side edge 20 Notch

Claims (1)

In a liquid crystal display device in which a plurality of lead terminals of a liquid crystal display element and corresponding lead terminals of a flexible wiring board are connected, a bent portion is formed in the flexible wiring board, and connected to a power supply circuit.
The bent portion is formed from a pair of small bent portions that are formed at a distance in the longitudinal direction of the flexible wiring board and are bent slightly, and a flat portion formed between the pair of small bent portions. Configured,
Although-out each notch is formed on both side edges of the curved portion of the base film of the flexible wiring board,
2. The liquid crystal display device according to claim 1, wherein the notch has a width extending from one small bend portion to the other small bend portion .

Images