JP2748654B2 - Liquid crystal display substrate and liquid crystal display device using the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a substrate configuration of a liquid crystal display device.

2. Description of the Related Art In recent years, liquid crystal display technology has greatly advanced, and the beauty of images has become comparable to that of conventional cathode ray tubes. Further, the display device has become the most promising display device in combination with features such as thinness and lightness.

2. Description of the Related Art A panel of a conventional liquid crystal display device has two glass substrates provided with transparent electrodes opposed to each other with a liquid crystal interposed therebetween, and their peripheries are bonded to each other. Transparent electrodes formed in stripes and crossed by opposite electrodes are called simple matrix panels, and TFTs (Thin Film Transistor) panels are provided by adding thin film transistors for each pixel. The simple matrix panel has a simple structure and is inexpensive with a small number of drivers. However, in image quality, TFT
It is far from the panel. TFT panels have good image quality,
A thin film transistor must be added to each pixel using a thin film manufacturing apparatus, and the yield of the thin film transistors is low, and the TFT panel is very expensive.

Problems to be Solved by the Invention A liquid crystal panel having such a conventional configuration cannot be said to be superior in image quality or price as compared with a cathode ray tube due to its structure. Also, it is impossible to manufacture a thin, large-screen (for example, 50-inch) display device utilizing the flatness characteristic of a liquid crystal panel by using a conventional panel structure because of a low yield of constituent elements.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a large-screen liquid crystal display panel with image quality superior to that of a cathode ray tube at low cost.

Means for Solving the Problems To solve this problem, the present invention provides a liquid crystal display substrate having a structure in which a light-transmitting wiring substrate provided with a plurality of conductive wirings on a side surface is laminated, The tips of a plurality of conductive wires penetrating the substrate are arranged at a coarse density on the first surface, the tips of the conductive wire are densely arranged on the second surface, and picture elements corresponding to each conductive wire are arranged on the first surface. And the second surface is provided with an IC connection pad.

Operation With this configuration, a driver for driving the liquid crystal can be provided on the rear surface of the panel, so that a single crystal IC having higher reliability and higher performance than a TFT can be used for the driver. By using a single-crystal IC externally,
Throughput and low yield, which were problems in manufacturing TFT liquid crystal panels, have been improved, and liquid crystal panels with high productivity can be realized.

In addition, a capacitance element and a color filter for holding signals can be arranged outside the liquid crystal panel, and a storage device can be built in the external driving IC, so that a liquid crystal display device with excellent image quality can be obtained. Become.

EXAMPLES Hereinafter, the structure of the liquid crystal display substrate of the present invention will be described with reference to the drawings.

Embodiment 1 FIG. 1 shows a configuration of a liquid crystal display device using a liquid crystal display substrate 1 according to one embodiment of the present invention. As shown in the figure, the light-transmitting wiring board 2 has the conductive wiring 5 provided on a side surface thereof. The liquid crystal display substrate 1 is formed by laminating many wiring substrates 2. Here, the tip of the conductive wiring 5 is on the upper surface (first
Surface) and the lower surface (second surface). Conductive wiring 5
Is rough on the first side and densely exposed on the second side. On the first surface, a transparent electrode 9 for a picture element is formed so as to be connected to the tip of the conductive wiring 5. An IC connection pad (not shown) is provided so as to be connected to the end of the conductive wiring 5 on the second surface. In some cases, an alignment film (not shown) may be provided on the transparent electrode 9 for picture elements.

When a liquid crystal display panel is constructed using such a liquid crystal display substrate 1, the liquid crystal display panel includes a transparent substrate 7, a transparent electrode 8 and a polarizing plate 10, which are provided between the liquid crystal display substrate 1 and the counter substrate 7. Liquid crystal is sandwiched.

The backlight 6 (for example, a fluorescent lamp), which is a light source, is fitted into a light source installation space (recess) 11 to effectively use light rays. The polarizing plate 4 is provided in the light source installation space 11.

The density of the conductive wiring 5 is increased to secure a space for the light source installation space 11 and to connect a small IC 3. Although the light source installation space 11 is not always necessary, the provision of this space increases the light utilization rate. In some cases, it is possible to make a hole in the wiring board 2 and insert a fluorescent lamp therein.

The translucent wiring board 2 can have wavelength selectivity. That is, the wiring substrate 2 can be a color filter. In this case, the combination of red, green, and blue wiring boards must be repeated as a unit.
Needless to say. By doing so, a color liquid crystal display panel can be obtained.

In the embodiment shown in FIG. 1, the connection between the driving IC 3 and the tip of the conductive wiring 5 is made by flip-chip connection, but is not limited to this. However, flip-chip connection is preferred over other commonly known methods, such as wire bonding. The input wiring is provided on the second surface of the liquid crystal display substrate 1.

A transparent plastic or glass can be used for the light-transmitting wiring board 2, but high temperature (about 200
° C), and those having good heat resistance are preferred.
A conductive metal formed by a method such as plating, vapor deposition, or sputtering is effective for the wiring, but the wiring material does not need to have a low resistance because of the characteristics of the high-resistance liquid crystal, and a printed wiring can be used. The transparent electrode 9 for picture elements is generally made of indium oxide. The connection between the IC 3 and the conductive wire 5 is facilitated by providing a connection pad of gold deposition or gold plating on the conductive wire 5 side. There are many liquid crystal modes that can be used, such as dynamic scattering, TN, and STN. In the case of the TN or STN mode, an alignment control film is provided on the picture element transparent electrode to perform alignment processing.

Example 2 In FIG. 1 and its description, a transparent electrode and a driver are provided for each picture element. However, this is not essential, and as shown in FIG. 2, a plurality of picture elements can be combined into one electrode, and the counter electrode can be divided so that a so-called partial matrix drive can be performed. . As shown in FIG. 2, a plurality of light-transmitting wiring substrates 22 are stacked to form a liquid crystal display substrate 21. The liquid crystal display substrate 21 is provided with a space 23 in which a light source is installed (in the first embodiment, a recess processed into a semicircular shape). A plurality of picture elements 1 on the first surface
There is a single row transparent electrode 25. Conductive wiring 24 is a row transparent electrode
Reference numeral 25 denotes a conductive wiring extending to the second surface. The divided column transparent electrodes 26 are held by a counter substrate 27. The row transparent electrodes 25 and the column transparent electrodes 26 face each other so as to be orthogonal to each other, sandwich the liquid crystal between them, and perform matrix driving. Although there are many methods for this driving method, they are well known and will not be described.

Example 3 When laminating a light-transmitting wiring substrate having wavelength selectivity, light reflecting plates (for example, a film on which aluminum is deposited) are alternately laminated. With this configuration, it is possible to form a liquid crystal display substrate for color display with good characteristics without mixing light from the respective light-transmitting wiring substrates.

The light reflecting plate does not need to be a plate, but may have its function, and a reflecting layer may be provided directly on the wiring of the light-transmitting wiring board or on the side surface on the opposite side. However, the configuration must be such that the insulation between the wirings is not hindered.

As is clear from the above description of the embodiments, according to the present invention, a driver for driving a liquid crystal can be arranged at the rear of the panel, so that a single crystal IC with high reliability and high performance is provided. Can be used. Therefore, a large-sized substrate can be manufactured with high productivity without worrying about a throughput or a decrease in the yield unlike the manufacturing of the conventional TFT liquid crystal panel. Further, unlike the conventional TFT liquid crystal panel, there is no need to separately provide an electric capacitance for holding a signal, and there is no signal leakage due to wiring intersection. The driving IC can include a storage device, and excellent display characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a liquid crystal panel using a liquid crystal display substrate of one embodiment of the present invention, and FIG. 2 is an exploded perspective view of a liquid crystal panel using a liquid crystal display substrate of another embodiment of the present invention. It is. 1,21 ... LCD substrate, 2,22 ... Transparent wiring board,
3 ... Drive IC, 4 ... Polarizing plate, 5,24 ... Conducting wiring, 6
...... Backlight, 7,27 ... Transparent substrate, 8 ... Transparent electrode, 9 ... Transparent electrode for picture element, 10 ... Polarizer, 11,23
…… Light source installation space, 25 …… Transparent electrodes in rows, 26 …… Transparent electrodes in columns.

Claims (12)

(57) [Claims] 1. A substrate obtained by laminating a light-transmitting wiring substrate provided with a plurality of conductive wirings on a side surface and cutting the conductive wiring so that end faces of the conductive wirings are exposed, wherein the plurality of conductive wirings penetrate the substrate. For liquid crystal display, the tips have a coarse density on the first face, the tips of the conductive wires are densely arranged on the second face, and transparent electrodes for picture elements are provided on the first face corresponding to each conductive wire. substrate. 2. The liquid crystal display substrate according to claim 1, wherein, on the second surface, the tips of the conductive wires are arranged so as to avoid the portion where the light source is installed. 3. The liquid crystal display substrate according to claim 2, wherein a concave portion is provided so as to surround the light source at a portion where the light source is installed, so that light incident efficiency of the light source is increased. 4. A space for inserting a light source is provided in a substrate,
The liquid crystal display substrate according to claim 1, wherein conductive wiring is provided so as to avoid this space. 5. The liquid crystal display substrate according to claim 1, wherein the translucent substrates to be laminated are color filters. 6. A substrate obtained by laminating a light-transmitting wiring substrate provided with a plurality of conductive wirings on a side surface and cutting the conductive wiring so that an end surface of the conductive wiring is exposed, wherein the plurality of conductive wirings penetrate the substrate. For liquid crystal display, the tips have a coarse density on the first face, the tips of the conductive wires are densely arranged on the second face, and transparent electrodes for picture elements are provided on the first face corresponding to each conductive wire. A liquid crystal display device comprising a liquid crystal panel sandwiching liquid crystal between a substrate and an opposing substrate holding a transparent electrode, a polarizing plate sandwiching the liquid crystal, a light source, and a driver for driving the liquid crystal panel. 7. A substrate obtained by alternately laminating a light-transmitting wiring substrate having a plurality of conductive wirings provided on side surfaces thereof and a light reflecting plate, and cutting the conductive wiring so that an end face of the conductive wiring is exposed. The tips of the plurality of conductive wires penetrating through the first surface have a coarse density on the first surface,
A liquid crystal display substrate having, on a second surface, leading ends of conductive wires arranged densely, and a first surface provided with transparent electrodes for picture elements corresponding to the respective conductive wires. 8. The liquid crystal display substrate according to claim 7, wherein, on the second surface, the tips of the conductive wires are arranged so as to avoid the portion where the light source is installed. 9. The liquid crystal display substrate according to claim 8, wherein a concave portion is provided so as to surround the light source at a portion where the light source is installed, and the light incident efficiency of the light source is increased. 10. The liquid crystal display substrate according to claim 7, wherein a space in which a light source can be inserted is provided in the substrate, and conductive wiring is arranged so as to avoid this space. 11. The liquid crystal display substrate according to claim 7, wherein the translucent substrates to be laminated are color filters. 12. A substrate obtained by alternately laminating a light-transmitting wiring substrate provided with a plurality of conductive wirings on a side surface and a light reflecting plate, and cutting the substrate in a direction perpendicular to the laminating direction, and penetrating the substrate. The tips of the plurality of conductive wires are arranged at a coarse density on the first surface, the tips of the conductive wire are densely arranged on the second surface, and the transparent electrodes for picture elements are arranged on the first surface corresponding to each conductive wire. A liquid crystal display device comprising: a liquid crystal display substrate provided; a panel in which liquid crystal is sandwiched between opposing substrates holding transparent electrodes; a polarizing plate and a light source sandwiching the liquid crystal display; and a driver for driving the liquid crystal panel.