JPS5837554B2 - liquid crystal display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display device, and particularly to an electrode pattern and a drive circuit for dynamic driving.

When displaying multi-digit numbers, such as on a calculator, dynamic driving is generally considered to simplify the driving circuit.

When a liquid crystal display is applied to a display panel for a calculator, dynamic driving is naturally required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device having a multi-digit dynamic drive drive circuit that can be driven with a simple circuit by improving the method of dividing an electrode pattern.

Figure 1 shows an example of the upper and lower electrode patterns of a liquid crystal display for dynamic drive that has been generally considered in the past.
are the upper and lower electrode patterns, respectively.

In general dynamic driving, it is necessary to wire segments corresponding to each digit, so as is clear from the figure, mutual wiring must be sewn between the gaps between each segment pattern.

For example (part 2 in Figure 1).

Therefore, the gap between the segments (for example, the portion a in FIG. 1) must be wide to avoid contact with the mutual wiring pattern.

Therefore, the segments are spaced apart from each other, and the number pattern looks like the segment blocks are separated, as shown in FIG. 2, resulting in a number pattern that is very difficult to read.

Further, since the number of segment interconnections is large and frequent, and there are many thin line portions and thin gap portions, the electrode pattern manufacturing yield is reduced accordingly.

Figure 3 shows the improved two-digit dynamic wiring, in which the upper electrode is divided into four blocks with two segments each.

The lower electrode is divided into two blocks each having four segments, and the segment portions corresponding to each digit are interconnected with two lines.

According to FIG. 3, there is no need to run mutual wiring between each segment, the segment gap can be made very narrow, and each number can be grouped together as shown in FIG. 4.

In addition, complex interactions can be eliminated, and the number of small gaps and fine line parts can be reduced, leading to fewer electrode breakage defects and short-circuit defects between adjacent electrodes, which further improves the manufacturing system of electrode patterns.

Figure 5 shows another improved division pattern for 3-digit dynamic, and Figure 6 shows the division pattern for 4-digit dynamic.
In both cases, compared to the general pattern described above, the gap between the segments can be narrowed, making it possible to create easy-to-read numbers with good design, and since there is no need for a complicated pattern of mutual wiring, the manufacturing process for electrodes can be further improved.

The division for 3-digit dynamic drive in Fig. 5 is to divide the upper electrode into 3 parts.
The lower electrode is also divided into three parts, and the corresponding divided parts of each digit are interconnected in the lower electrode.

In the division for the four-digit dynamic drive shown in FIG. 6, the upper electrode is divided into four parts, the divided parts corresponding to each digit are interconnected, and the lower electrode part is divided into two parts.

FIG. 7 shows a specific example of a dynamic drive circuit for driving a divided pattern according to the present invention, in which binary data is once converted into segment blocks, and the converted block segment signals are read into a serial-in/parallel-out shift register. Further, it is stored in a parallel-in-parallel-out shift register, and a driver is controlled by the storage signal to generate a drive signal for one electrode.

One digit timing signal is also used to generate a digit drive signal with a duty of 1/4 using an AC driver, and is used as a drive waveform for the other electrode.

According to the above-described circuit configuration, it is possible to design the circuit without any disadvantages in terms of the number of circuit elements or the configuration, compared to the general type dynamic drive circuit described above.

As described above, according to the present invention, when performing multi-digit dynamic drive such as in a calculator, wiring between segments that stitches the gaps, which is a problem in liquid crystal displays, is prevented, and the dynamic drive is easy to see in terms of design and further improves manufacturability. In addition, it is possible to provide a liquid crystal display panel that is inexpensive and highly reliable without placing any burden on the circuit structure.

[Brief explanation of drawings]

Figure 1 shows the electrode pattern for multi-digit dynamic driving of a conventional general liquid crystal display. FIG. 2 shows an example of numbers displayed on a liquid crystal display made according to the electrode pattern shown in FIG. Figure 3 shows the improved division pattern for two-digit dynamic. FIG. 4 shows an example of displayed numbers when the improved electrode pattern shown in FIG. 3 is used. Figure 5 shows the improved division pattern for 3-digit dynamic. Figure 6 shows the improved division pattern for 4-digit dynamic. FIG. T shows an example of a driving circuit for a divided pattern type liquid crystal display according to the present invention.

Claims (1)

[Claims] 1. In a liquid crystal display device comprising at least a liquid crystal display element and a drive circuit for driving the liquid crystal driver element, the upper and lower electrode patterns for the liquid crystal display element to display one number are each divided into two or four parts. One of the upper or lower electrode patterns has divided portions corresponding to each digit connected to each other, and the driving circuit has a decoder for converting binary data into segment blocks, and a decoder for converting binary data into segment blocks; a serial-in/parallel-out first shift register that reads the block segment signal output from the decoder; a parallel-in/parallel-out second register that stores the output of the first shift register; A driver for driving the electrodes on the non-interconnected side according to a storage signal of a register, a ring counter receiving a digit timing signal as input, and driving the interconnected electrodes controlled by the output of the ring counter. A liquid crystal display island characterized by having an AC driver of