JPH0279024A - Liquid crystal display panel - Google Patents

Abstract

PURPOSE:To display an image of high quality corresponding to large area and large capacity with simple constitution by providing striped transparent conductive films corresponding to scanning lines on the outside surface of one insulating substrate and connecting both ends of each transparent conductive film to both ends of each scanning line. CONSTITUTION:A TFT matrix substrate 2, a liquid crystal layer 3, and a common electrode substrate 1 are laminated on a polarizing plate 7 and a polarizing plate 6 which has a transparent conductive film 5 formed on the surface is further provided on a common electrode substrate 1. Namely, the striped transparent conductive films 5 corresponding to scanning-side transparent electrodes 4 are provided on the outside surface of the transparent insulating substrate 1 and both ends of each transparent conductive film 5 are connected electrically to both ends of each scanning-side transparent electrode 4. Consequently, the liquid crystal display panel of high quality which can be increased in area and capacity is obtained.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a liquid crystal display panel formed by sandwiching a liquid crystal between two transparent insulating substrates having transparent electrodes. Aiming to provide a high-quality LCD panel, the LCD panel consists of a plurality of pixels arranged in a matrix with a liquid crystal layer sandwiched between two insulating substrates, each of which has a transparent electrode, at least one of which is transparent. A liquid crystal display panel in which a driving signal is supplied to one end of the one transparent electrode, wherein a plurality of transparent stripes corresponding to the scanning side transparent electrode are provided on the outer surface of the one transparent insulating substrate. A conductive film is provided, and both ends of each transparent conductive film are electrically connected to both ends of each scanning side transparent electrode.

[Industrial application field]

The present invention relates to a liquid crystal display panel, and particularly to a liquid crystal display panel formed by sandwiching liquid crystal between two transparent insulating substrates having transparent electrodes.

2. Description of the Related Art In recent years, flat display devices such as liquid crystal display panels that are thin, lightweight, and consume little power have attracted attention as display devices connected to word processors, microcomputers, various terminal devices, and the like. This liquid crystal display panel is required to have a larger area, larger capacity, and lower cost.

[Prior Art] FIG. 4 is a diagram showing an example of a conventional transmissive liquid crystal display panel, with FIG. 4(a) showing a cross-sectional view and FIG. 4(b) showing a plan view.

As shown in FIG. 4(a), in the conventional transmissive liquid crystal display panel, between two polarizing plates 106 and 107,
TFT matrix substrate 102. Liquid crystal layer 103. A common electrode substrate 101 is provided. The liquid crystal layer 103 is sealed between the TFT matrix substrate 102 and the common electrode substrate 1010 by a sealant 108.

As shown in FIG. 4(b), the TFT matrix substrate 102 has a plurality of signal lines (data bus lines).
121 and scanning lines (scanvas lines) 122 are formed in a matrix, and a switching element made of a TFT and a pixel electrode made of a transparent conductive film are provided at the intersections of each signal line 121 and scanning line 122, respectively. Further, the common electrode substrate 101 is provided with a common electrode made of a solid transparent conductive film so as to cover the entire surface. A predetermined image is displayed by voltage signals corresponding to display data applied between these pixel electrodes and the common electrode. Specifically, one end of the plurality of scanning lines 122 (the left end in FIG. 4(b)) is connected to a scanning circuit, and the drive signal from the scanning circuit is connected to one end.
While manually scanning each scanning line 122, display data is selectively input to a plurality of signal lines 121, and the corresponding T
The FT is turned on by a drive signal and display data is applied to the pixel electrode. Note that the manual form of the signal is the same for the reflective liquid crystal display panel.

[Problem to be solved by the invention]

As described above, in a conventional liquid crystal display panel, for example, a plurality of scanning lines are controlled by a drive signal from a scanning circuit connected to one end.

By the way, as we try to increase the area and capacity of display panels, the width-to-length ratio of the scan canvas lines becomes smaller, and the resistance of the pass lines becomes a problem. When the number of pixels is increased to increase the area and capacity, the number of TFTs connected to one scan canvas line increases, and the parasitic capacitance also increases.As a result, the input drive waveform becomes dull. In addition to the high resistance of the scan canvas line due to its shape, the large capacitance of the display panel has made it difficult to drive the l line. Shorter time also leads to deterioration in display quality.

The above is particularly true in TFT active matrix type liquid crystal display panels, although scanning lines generally require more current driving ability than signal lines.
A staggered TFT with a bottom gate structure is used,
Another reason is that low resistance materials cannot be used for the scan canvas lines that connect the gates.

SUMMARY OF THE INVENTION In view of the above-mentioned problems with conventional liquid crystal display panels, it is an object of the present invention to provide a high-quality liquid crystal display panel that has a simple configuration and is compatible with a large area and large capacity.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of a liquid crystal display panel according to the present invention.

According to the present invention, a plurality of (
A liquid crystal layer 3 is sandwiched between two insulating substrates 1 and 2, one of which is transparent, forming a plurality of pixels arranged in a matrix, and a drive signal is supplied to one end of the one transparent electrode 4 on the scanning side. In this liquid crystal display panel, a plurality of striped transparent conductive films 5 corresponding to the scanning side transparent electrodes 4 are provided on the outer surface of the one transparent insulating substrate 1, and each of the transparent conductive films 5 is There is provided a liquid crystal display panel characterized in that both ends are electrically connected to both ends of each scanning side transparent electrode 40, respectively.

[For production]

According to the liquid crystal display panel of the present invention having the above-described configuration, a plurality of striped transparent conductive films 5 corresponding to the scanning side transparent electrodes 4 are provided on the outer surface of the transparent insulating substrate 1,
Both ends of each of these transparent conductive films 5 are electrically connected to both ends of each scanning-side transparent electrode 4, respectively. As a result, it is possible to provide a high-quality liquid crystal display panel that is compatible with a large area and large capacity with a simple configuration.

〔Example〕

Hereinafter, one embodiment of a liquid crystal display panel according to the present invention will be described with reference to the drawings.

FIG. 2 is a diagram showing an embodiment of the liquid crystal display panel of the present invention, and shows a TFT active matrix type liquid crystal display panel. Figure (a) shows a cross-sectional view, and figure (b)
shows a plan view.

As shown in FIG. 2(a), the liquid crystal display panel of this embodiment has a TFT matrix (IJ Fuchs plate 2) on a polarizing plate 7.
．． Liquid crystal layer 3. A common electrode substrate 1 is laminated, and a polarizing plate 6 having a plurality of striped transparent conductive films 5 formed on its surface is further provided on the common electrode substrate 1. Here, the liquid crystal layer 3 is sealed between the TFT matrix substrate 2 and the common electrode substrate 1 by a sealing material 8. Further, although the striped transparent conductive film 5 is formed on the surface of the polarizing plate 6 on the common electrode substrate 1 side, it can also be formed on the opposite surface of the polarizing plate 6. Furthermore, the striped transparent conductive film 5 is, for example,
It can also be formed on the surface of an antireflection film provided on the polarizing plate 6.

As shown in FIG. 2(b) and FIG.
are formed in a matrix shape, and a switching element 23 made of a TFT and a pixel electrode 24 made of a transparent conductive film are provided at the intersections of each signal line 21 and scanning line 22, respectively. A common electrode 11 made of a solid transparent conductive film is provided so as to cover the entire surface.

Furthermore, a signal supply circuit 31 is connected to one end of the signal line 21, and a scanning circuit 32 is connected to one end of the scanning line 22, and display data from the signal supply circuit 31 and the scanning circuit 32 are supplied. Depending on the drive signal, the corresponding T
A predetermined image is displayed by turning on the FT and applying a voltage corresponding to display data between the pixel electrode 24 and the common electrode 11.

The plurality of striped transparent conductive films 5 on the polarizing plate 6 are formed to correspond to each scan canvas line 4, respectively. Then, both ends of the corresponding striped transparent conductive films 5 are electrically bonded to both ends of each scan canvas line 4 taken out on both sides of the area where the liquid crystal layer 3 is sealed with a conductive paste. Here, the striped transparent conductive film 5 made of a transparent conductive film such as ITO is formed to be thick in order to reduce the resistance value of the striped transparent conductive film 5.

That is, the resistance value of the scan canvas line 4 is R8,
When the resistance value of the striped transparent conductive film 5 is R, Ro
>R, and the striped transparent conductive film 5 is formed so that the drive signal from the scanning circuit 32 is supplied from both sides of each scan canvas line 4 in a pseudo manner.

That is, the drive signal passing through the striped transparent conductive film 5 is supplied to the other end of the scan canvas line 4 to which the scanning circuit 32 is not connected. Further, both ends of the scan canvas line 4 and the corresponding ends of the striped transparent conductive film 5 can be electrically connected by various methods other than adhesion using conductive paste.

In this way, by electrically connecting both ends of the corresponding striped transparent conductive film 5 to both ends of each scan canvas line 40 and supplying drive signals from the scanning circuit 32 from both sides of the scan canvas line 4, scanning can be performed. It is possible to maintain the display quality of a liquid crystal display panel that has a large area and a large capacity, where the resistance of the bus line 4 is a problem.

Further, according to the liquid crystal display panel of this embodiment, even if the scan canvas line 4 is disconnected midway, normal display can be performed because drive signals are supplied from both sides of the scan canvas line 4. That is, the redundancy of the liquid crystal display panel can be increased, and the yield can be improved.

In the above embodiments, a TFT active matrix type liquid crystal display panel has been described as the liquid crystal display panel, but it goes without saying that the present invention can also be applied to a simple MA) IJ Fuchs liquid crystal display panel. That is, in a liquid crystal display panel with a simple matrix structure, for example, if both sides of the striped transparent conductive film 5 described above are electrically connected to both sides of the transparent electrode on the scanning side, display quality and redundancy can be improved. can be improved.

〔Effect of the invention〕

As described above in detail, the liquid crystal display panel according to the present invention includes a plurality of striped transparent conductive films provided on the outer surface of at least one of the insulating substrates corresponding to the scanning lines, and a plurality of striped transparent conductive films corresponding to the scanning lines. By electrically connecting both ends to both ends of each scanning line, it is possible to display high-quality images with a simple configuration that corresponds to a large area and large capacity.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle of the liquid crystal display panel according to the present invention, Fig. 2 is a diagram showing an embodiment of the liquid crystal display panel according to the invention, and Fig. 3 is a diagram showing the pixel electrodes in the liquid crystal display panel of Fig. 2. A diagram showing the relationship with a transparent conductive film. FIG. 4 is a diagram showing an example of a conventional transmission type liquid crystal display panel. (Explanation of symbols) 1.2... Transparent insulating substrate, 3... Liquid crystal layer, 4... Scan canvas line, 5... Transparent conductive film, 6.7... Polarizing plate, 8... -Sealing material, 11...Common electrode, 21...Signal line, 22...Scanning line, 23...TFT. 24... Pixel electrode.

Claims (1)

[Claims] 1. A plurality of pixels arranged in a matrix are constructed by sandwiching a liquid crystal layer (3) between two insulating substrates (1, 2), at least one of which is transparent, each having a transparent electrode formed thereon. , a liquid crystal display panel in which a driving signal is supplied to one end of the one transparent electrode (4) on the scanning side, wherein the scanning side transparent electrode is provided on the outer surface of the one transparent insulating substrate (1). A liquid crystal display characterized in that a plurality of striped transparent conductive films (5) corresponding to (4) are provided, and both ends of each of the transparent conductive films are electrically connected to both ends of each of the scanning side transparent electrodes. panel. 2. The scanning side transparent electrode (4) is a scan canvas line of a TFT matrix, and both ends of each scan canvas line are electrically connected to both ends of each striped transparent conductive film, respectively. The liquid crystal display panel according to item 1. 3. The striped transparent conductive film (5) is formed on the surface of a polarizing plate (6) disposed on the one insulating substrate. LCD display panel. 4. The liquid crystal display panel according to claim 1, wherein the striped transparent conductive film is formed on the surface of an antireflection film disposed on the one transparent insulating substrate.