JPH06242457A - Reflection type liquid crystal display - Google Patents

Abstract

PURPOSE:To prevent a situation that the numerical aperture of a screen is lowered as high definition is attained in order to make resolution higher by providing the piercing and connecting part of an electrode, and to prevent the visual easiness of the screen from being impaired because a non-picture element part where wiring is performed becomes a joint when a large screen is obtained by adjoining liquid crystal panels. CONSTITUTION:A liquid crystal layer 8 is sandwiched between a driving substrate 1 having transparent driving electrode picture element 2 and a common substrate 6 having a common electrode 7. The driving electrode piercing and connecting part is provided in the driving electrode picture element 2 on the driving substrate 1, and a driving electrode lead-in wire is provided on a back surface, then the wiring is three-dimensionally performed. A common electrode lead-in wire is also arranged on the back surface by providing a common electrode piercing and connecting part connected to the electrode 7 with conductive adhesive. Thus, the non-picture element part does not exist on the outer periphery of the substrate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflective liquid crystal display with high resolution and inconspicuous seams, and particularly to obtain a large screen.

[0002]

2. Description of the Related Art Conventionally, among drive electrodes provided on a glass substrate of a liquid crystal display, those having independent pixels and lead lines have lead lines provided between pixels. As the number of pixels increases, the ratio of the area required to provide the leader line increases with respect to the pixel area. The aperture ratio as a pixel decreases. That is, since the resolution is increased, the higher the resolution, the lower the aperture ratio.

As a conventional example, Japanese Patent Laid-Open No. 59-21618.
There is one described in Japanese Patent No. 4 publication. This is an arrangement in which the leader lines are arranged between pixels in consideration of the leader line extraction direction and position, but it is an in-plane wiring and requires a width for providing the leader lines between the pixels.

Incidentally, the lead line of a glass substrate of a liquid crystal display that is driven by a matrix drive having stripe-shaped pixels has a similar problem.

Next, when a large screen is constructed, a problem of joints occurs between the liquid crystal panels.

In the transmissive and reflective liquid crystal displays, in order to obtain a large screen, the liquid crystal panels need to be adjacent to each other so that the joint between the liquid crystal panels is not conspicuous. Various methods have been considered in this regard. For example, a liquid crystal panel is adjacent to a flat surface, and a prism with the light source side as the apex is arranged behind the wiring section of the liquid crystal section that is a non-pixel section (joint), and light is transmitted through the entire panel to form a joint. There is a method of making it inconspicuous, for example, the method described in JP-A-61-118789. In this method, the transmitted light from the picture element at the outer edge of the liquid crystal part is bent by a prism so that the transmitted light comes to the joint, and it is necessary to let the transmitted light once out on the entire panel for viewing. There is. According to this, the front panel is always required.

As still another conventional example, a liquid crystal panel is disposed adjacent to a flat surface, and a prism or a liquid crystal panel is provided so as to correspond to one pixel of the liquid crystal panel adjacent to the wiring portion of the liquid crystal portion which is a non-pixel portion (joint). An optical path guide unit is provided that can move incident light and emitted light in parallel by mirrors having optical reflection surfaces on both sides, and the image is moved in parallel on the wiring part of the liquid crystal part (by bringing the image together) so that the joints are not conspicuous. Method, for example, the method described in JP-A-61-188580.

Since this method is a method of moving the image in parallel on the joint, only two adjacent liquid crystal panels can be used as the unit liquid crystal panel and the joint cannot be made inconspicuous. Therefore, all joints of a large number of liquid crystal panels are formed. It is not suitable for large screens where it is desired to make the image inconspicuous.

[0009]

In the transmissive and reflective liquid crystal displays described above, the liquid crystal panels must be adjacent to each other in order to obtain a large screen, but a non-pixel portion in which wiring is provided. However, there was a problem that the screen was not visible and the visibility of the screen was impaired.

It is an object of the present invention to provide a large-screen reflective liquid crystal display in which the joints which are non-pixel portions are inconspicuous, and the aperture ratio of the screen is reduced as the resolution is increased to a higher resolution. At the same time, we try to solve the problems that occur.

[0011]

In order to achieve the above-mentioned object, wirings are provided to lead lines on the back surface and electrodes through the through holes provided in the drive substrate from the independent drive electrode pixels provided on the drive substrate. A drive electrode through-connection portion for connection was provided.

The lead-out line on the back surface and the pattern of the electrodes may be positioned so as to overlap the drive electrode pixels on the front surface (liquid crystal side). That is, the conventional in-plane wiring is changed to three-dimensional wiring.

Further, an integrated circuit for driving liquid crystal is mounted on the back surface of the drive substrate.

[0014]

In the past, lead lines had to be provided between pixels on the front surface (liquid crystal side) of the drive substrate. However, by providing drive electrode through connection parts and common electrode through connection parts, it is possible to connect to the back surface of the drive substrate. A leader can be provided,
Regardless of the position of the leader line, regardless of the pattern on the surface side of the drive board, it is not necessary to put it in a narrow area of the pixel, a wide wiring pitch can be obtained, the surface side of the drive board becomes fine, and the pixel pitch becomes small. However, since the back side of the drive board can be used effectively, it is possible to connect to the leader line from the outside without difficulty.

In other words, there is no pixel-free portion on the surface of the drive electrode pixel, and it is possible to obtain a liquid crystal panel having a high definition and a high aperture ratio, which can be constituted by only the drive electrode pixel. Further, since the liquid crystal panel has pixels all the way to the outer periphery, the liquid crystal panels are adjacent to each other to form a large screen, and the joints are not noticeable.

Further, by mounting an integrated circuit for driving a liquid crystal on the back surface of the drive substrate, the number of lines connecting from the liquid crystal panel to the outside is reduced, and the entire screen can be miniaturized, thinned and weighed.

[0017]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a reflective liquid crystal panel adopting the present invention.

A liquid crystal layer 8 is sandwiched between a drive substrate 1 having a transparent drive electrode pixel 2 and a common substrate 6 having a common electrode 7.

A voltage is applied between the drive electrode pixel 2 and the common electrode 7 to drive the liquid crystal layer 8. As a method of applying a voltage to the drive electrode pixel 2, a wiring for applying a voltage is shown in FIG.

In FIG. 2, the drive electrode pixels 2 are arranged on the plane of the drive substrate 1, and each drive electrode pixel 2 is connected to the back surface of the drive substrate 1 via the drive electrode penetrating connection portion 4.

FIG. 3 shows a rear view of the drive board. The drive electrode lead-out wire 3 is connected to the drive electrode penetrating connection portion 4 penetrating to the back surface of the drive substrate 1, and the connection terminal 1
It is connected to 0. The liquid crystal layer 8 can be driven by applying a voltage to the connection terminal 10.
Further, mounting the integrated circuit on the back surface of the drive substrate 1 is also included in the present invention.

FIG. 4 shows a plan view of the common substrate. The common substrate 6 has a transparent common electrode 7. The shape of the common electrode 7 is not limited to the shape shown in FIG. The material of the common substrate 6 is mainly transparent plastic or glass.

FIG. 5 shows a cross-sectional view of the common electrode through-connection portion. The common electrode through connection portion 9 and the common electrode 7 are bonded to each other with a conductive adhesive or the like so as to be electrically connected.

FIG. 6 is a sectional view of the drive electrode penetrating adhesive portion. Drive electrode pixel 2 provided on the drive substrate 1
The drive substrate 1 is provided with a drive electrode penetrating connection portion 4 for connecting to the drive electrode lead wire 3 on the back surface through the through hole of the drive substrate 2.

FIG. 7 is a sectional view of the drive board 1.

In FIG. 7- (a), a color material 11 is provided on a drive substrate 1 by printing or the like, and a transparent drive electrode pixel 2 is provided thereon.

According to this method, the color material 11 can be visually recognized from the surface by applying a voltage to the drive electrode pixel 2 in the portion to be displayed.

The colors of the color material 11 can be red, blue, and green for full-color display of moving images. Further, the drive electrode pixel 2 and the color material 11 may be shaped like a grid as shown in FIG. 1, or the pattern may be displayed in a fixed pattern of some kind. The color and shape of the color material are not limited to those shown in this figure.

FIG. 7- (b) shows only the drive substrate of FIG.

In this case, the color of the drive board 1 is displayed.

The drive substrate 1 uses ceramic or plastic because it is necessary to process the through hole. The material is not limited to these. FIG. 8 is an example in which four reflective liquid crystal panels are installed adjacent to each other. As shown in the figure, the pixels are filled up to the outer periphery of the panel.
Since 0 is on the back surface of the drive substrate, it is possible to obtain a large screen in which the connecting portion is inconspicuous at all. The number of adjacent panels can be increased as needed.

The above is an example of a drive substrate having independent drive electrode pixels, but the same method can be applied to a drive substrate of a reflection type liquid crystal display that is driven by a matrix drive having stripe pixels.

[0034]

According to the present invention, the lead-out line can be provided on the back surface of the drive substrate by providing the drive electrode through-connection portion and the common electrode through-connection, and the lead-out line can be arranged on the front surface side pattern of the drive substrate. Irrespective of the need to put it in a narrow area between pixels, a wide wiring pitch can be obtained, and even if the front side of the glass substrate becomes high-definition and the pixel pitch becomes small, the back side of the drive substrate can be effectively used You can easily connect to the leader line. In other words, the leader line does not interfere with the high definition of the screen.

Further, when a plurality of liquid crystal panels are installed adjacent to each other, the joints are not noticeable. Further, by mounting an integrated circuit for driving the liquid level on the back surface of the drive substrate, the number of lines connecting from the liquid crystal panel to the outside is reduced, and the entire screen can be made smaller, thinner, and weighed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a reflective liquid crystal panel according to an embodiment of the present invention.

FIG. 2 is a plan view of a drive board according to an embodiment of the present invention.

FIG. 3 is a back view of a drive substrate according to an embodiment of the present invention.

FIG. 4 is a plan view of a common substrate according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view of a common electrode through connection part according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view of a drive electrode through connection part according to an embodiment of the present invention.

FIG. 7 is a sectional view of a drive board according to an embodiment of the present invention.

FIG. 8 is a diagram in which reflective liquid crystal panels according to an embodiment of the present invention are arranged adjacent to each other.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Drive substrate, 2 ... Drive electrode pixel, 3 ... Drive electrode lead-out line, 4 ... Drive electrode penetration connection part, 5 ... Common electrode lead-out line, 6 ... Common substrate, 7 ... Common electrode, 8 ...
Liquid crystal layer, 9 ... Common electrode through connection part, 10 ... Connection terminal,
11 ... Color material.

Claims (7)

[Claims] 1. A drive substrate having drive electrode pixels,
In a liquid crystal display comprising a common substrate having a common electrode which is the counter electrode and a liquid crystal panel having at least three elements of a liquid crystal layer sandwiched between the substrates, a drive electrode pixel provided on the drive substrate is used to drive a pixel. A reflection type liquid crystal display, characterized in that it has an electrode through-connection portion for connecting a lead wire on the back surface and an electrode through a through hole provided in a substrate. 2. A drive substrate having drive electrode pixels,
In a liquid crystal display composed of a common substrate having a common electrode which is its counter electrode and a liquid crystal panel having at least three elements of a liquid crystal layer sandwiched between the substrates, a color material is provided on the drive substrate, and the color material is further provided. Reflection type characterized in that it has an electrode through-connection portion for connecting wiring from the drive electrode pixel provided on the material to the coloring material and the through hole provided in the drive substrate to the lead wire on the back surface of the drive substrate or the electrode. Liquid crystal display. 3. A reflective liquid crystal display, characterized in that the material of the drive substrate according to claim 1 or 2 is ceramics. 4. A reflective liquid crystal display, wherein the material of the common substrate according to claim 1 or 2 is glass. 5. A reflective liquid crystal display in which the drive substrate and the common substrate according to claim 1 and 2 are made of plastic. 6. The outer shape of the liquid crystal panel is cut at a position in contact with the outer periphery of the drive electrode pixel or at a position slightly apart from the drive electrode pixel. When the liquid crystal panels are arranged adjacent to each other, a joint between the liquid crystal panels is conspicuous. The reflective liquid crystal display according to claim 1 or 2, wherein a large screen is formed so as not to exist. 7. A reflection type liquid crystal display, wherein an integrated circuit is mounted on the back surface of the drive substrate according to claim 1 or 2 so that drive electrode pixels on the front surface can be driven.