JPH0519242A - Liquid crystal panel - Google Patents

Abstract

PURPOSE:To decrease the number of pieces of ICs to be used, and to reduce the cost of the liquid crystal panel by forming integrally three pieces of liquid crystal panels and using a scanning line driving IC in common. CONSTITUTION:By integrating three pieces of liquid crystal panels onto one piece of lower side substrate 1, a scanning line 5 is used in common and driven by two pieces of scanning line driving ICs 4. As for a data line 6, different signals are inputted to three pieces of liquid crystal panels, respectively, but as for the scanning line 5, a scan in the vertical direction is its purpose, therefore, three pieces of liquid crystal panels can all be used in common by the same signal. In this case, possibility that the manufacturing yield is deteriorated against a defect of the liquid crystal panel is also high, therefore, it is also considered that three pieces of liquid crystal panels having no defect manufactured as a conventional method are connected to one piece of panel by using a connection FPC. According to this method, it does not occur to become disadvantageous in respect of yield.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal panel.

[0002]

2. Description of the Related Art In recent years, a projection type video projector using a liquid crystal panel instead of a CRT projection tube has been put into practical use (Nikkei Electronics, March 5, 1990, "Projection type display plays a leading role").

In such a liquid crystal projector, since the ratio of the liquid crystal panel to the product cost is high, there is a strong demand for cost reduction. For that purpose, it is necessary to increase the manufacturing yield of the liquid crystal panel and to make the liquid crystal driving IC somehow inexpensive.

In a liquid crystal panel used for a liquid crystal projector, a liquid crystal panel is provided with a scanning line driving IC chip for driving liquid crystal driving so-called scanning lines in the horizontal direction of the screen and a data line driving IC chip for driving vertical data lines. Implemented in.

At present, in the liquid crystal projector, a three-plate type in which three liquid crystal panels are used and liquid crystal shutters of three primary colors of red, green, and blue are used respectively, is the mainstream.

A conventional liquid crystal panel will be described below with reference to the drawings. FIG. 4 is a plan view showing a conventional liquid crystal panel. A data line driving IC 3 and a scanning line driving IC 4 are mounted on the lower substrate 1. Liquid crystal is sealed between the counter substrate 2 and the lower substrate 1, and the scanning lines 5 and the data lines 6 are included.
Driven by. In the liquid crystal panel produced by the inventor, about one-third of the material cost is the price of the IC. It is difficult to manufacture a low-cost liquid crystal panel unless the IC price is reduced by reducing the chip area of one IC to reduce the unit price or reducing the number of IC chips used.

FIG. 5 is a perspective view showing a conventional liquid crystal projector. Light emitted from a light source 12 is separated into three primary colors by a dichroic mirror 9 and is incident on three liquid crystal panels 8 and is forwarded via a reflecting mirror 10 and a projection lens 11. Projected on the screen. A video signal is decomposed into three primary colors and input to the liquid crystal panel 8, and an image corresponding to the video signal can be projected.

[0008]

However, in the above-mentioned conventional method, six ICs are used for one liquid crystal panel, and eighteen driving ICs are required for three liquid crystal panels. As described above, the driving IC is expensive, which is one of the factors that hinder the cost reduction of the liquid crystal panel.

The present invention solves such problems and provides an inexpensive liquid crystal panel by reducing the number of driving ICs used.

[0010]

In order to achieve the above object, the liquid crystal panel of the present invention has a common scanning line driving IC by integrating three liquid crystal panels.

[0011]

Therefore, according to the present invention, three conventional liquid crystal panels can be driven by one scanning line driving IC.

[0012]

Embodiments of the present invention having the same function are denoted by the same reference numerals, detailed description thereof will be omitted, and different points will be described.

(Embodiment 1) FIG. 1 is a plan view showing a liquid crystal panel of a first embodiment of the present invention. By forming the three liquid crystal panels shown in the conventional example on one lower substrate 1, the scanning lines 5 are made common and can be driven by the two scanning line driving ICs 4. Different signals are input to the data lines 6 on the three liquid crystal panels, but the scanning lines 5 are for the purpose of vertical scanning, and therefore the same signals can be applied to the three liquid crystal panels and can be shared.

(Embodiment 2) FIG. 2 is a plan view showing a liquid crystal panel according to a second embodiment of the present invention. 1 as in Example 1
If three liquid crystal panels are formed on the lower substrate of one sheet, there is a high possibility that the manufacturing yield will decrease due to defects in the liquid crystal panel. Therefore, in this embodiment, three liquid crystal panels are manufactured as in the conventional case, and three defect-free liquid crystal panels are used for connection F.
It is one panel that is connected using the PC 7. With this method, there is no disadvantage in yield from the conventional liquid crystal panel.

FIG. 3 is a perspective view showing a liquid crystal projector using the liquid crystal panel of the embodiment of the present invention. The integrated liquid crystal panel 8 is arranged at the same position as the conventional example.

As described above, according to the above-mentioned embodiment, three liquid crystal panels can be driven by the two scanning line driving ICs 4.

Further, in this embodiment, the so-called COG method of mounting the scanning line driving IC 4 and the data line driving IC chip 3 on the lower substrate 1 is used, but the TAB method which is usually used as a mounting method of a liquid crystal panel. The present invention is effective even if the above is used.

[0018]

As is apparent from the above-described embodiment, the present invention can reduce the number of scanning line driving ICs to one-third of that of the prior art by integrating three liquid crystal panels in the past. It is possible to reduce the cost of the line driving IC and manufacture a low-cost liquid crystal panel.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of a first embodiment of a liquid crystal panel of the present invention.

FIG. 2 is a plan view showing the configuration of a second embodiment of the present invention.

FIG. 3 is a perspective view of a liquid crystal projector using the liquid crystal panel of the present invention.

FIG. 4 is a plan view of a conventional liquid crystal panel.

FIG. 5 is a perspective view of a conventional liquid crystal projector.

[Explanation of symbols]

1 Lower substrate 2 Counter substrate 3 Data line driving IC 4 Scan line driving IC 5 scan lines 6 data lines 7 FPC for connection 8 LCD panel 9 dichroic mirror 10 Reflector 11 Projection lens 12 light sources

Claims (6)

[Claims] 1. A data line driving IC chip, a set of scanning line driving ICs, and a display section divided into three blocks, wherein each of the display sections is divided by the three sets of data line driving ICs. A liquid crystal panel characterized in that each of the data lines of the block is driven, and the scanning lines of the three blocks are commonly driven by the set of scanning line driving ICs. 2. The liquid crystal panel according to claim 1, wherein the driving IC chip is mounted on the liquid crystal panel. 3. The liquid crystal panel according to claim 1, wherein the driving IC chip is mounted on the liquid crystal panel by using TAB. 4. A liquid crystal panel on which two data line driving IC chips are mounted, a liquid crystal panel on which one data line driving IC chip and a scanning line driving IC are mounted, and the three liquid crystal panels A set of scanning line driving ICs by connecting scanning lines
A liquid crystal panel characterized by driving three liquid crystal panels. 5. The liquid crystal panel according to claim 4, wherein the driving IC chip is mounted on the liquid crystal panel. 6. The liquid crystal panel according to claim 4, wherein the driving IC chip is mounted on the liquid crystal panel by using TAB.