JPH06149184A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To provide a small-sized and low cost liquid crystal display device with low power consumption. CONSTITUTION:This device is provided with a high duty driver 3 and a low duty driver 4, and is constituted so that a part displaying by high duty drive and a part displaying by low duty drive are provided in the same liquid crystal display element 5, and the display is performed by switching the high duty driving part and the low duty driving part. At the time of inoperation, a voltage applied to the liquid crystal element 5 is lowered by driving only a necessary part with the low duty. Thus, the power consumption in the liquid crystal device is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device which serves as a display unit for small information equipment such as pagers and handy terminals.

[0002]

2. Description of the Related Art In a conventional liquid crystal display device, when necessary information (battery level, date, time, etc.) is displayed even when not operated, as shown in FIG. It is divided into a liquid crystal display element 7 and a liquid crystal display element 8 which is turned on during operation. In this way, the remaining battery level, the time display, etc. are displayed on the liquid crystal display element 7 that is constantly lit, and the liquid crystal display element 8 that is lit during operation is displayed during operation. The liquid crystal display element 7 that is always lit and the liquid crystal display element 8 that is lit during operation are formed independently.
(A liquid crystal display element refers to a cell formed by sandwiching a liquid crystal between a pair of electrode substrates, and a liquid crystal display device refers to the whole including a driver portion), or
As shown in FIG. 4, the power consumption was not reduced and the operating time was sacrificed, and the liquid crystal display element 8 was always used for driving.

Further, Japanese Patent Application Laid-Open No. 3-25492 discloses a technique of switching between dynamic and static drive by switching the power supply voltage.

[0004]

The above-mentioned prior art requires a plurality of liquid crystal display elements 7 and 8 as shown in FIG.
It is difficult to reduce the size and requires a plurality of liquid crystal display elements, resulting in high cost. Further, as shown in FIG. 4, when one liquid crystal display element 8 is always driven, a voltage is applied to a display unnecessary portion even if a technique in which a dynamic driving waveform is a static driving waveform is used, and therefore, a non-operation Even at that time, the power consumption was so great that it could not be used for a long time with a battery.

Further, the technique disclosed in the above-mentioned Japanese Patent Laid-Open No. 3-25492 aims to simply correct the effective value, and the voltage is always applied to the display pattern of the liquid crystal display element. . Therefore, it has the same problems as described above.

Therefore, the present invention solves such a problem, and its purpose is to display necessary information (remaining battery level, date, time, etc.) even when not operated and to reduce consumption. An object of the present invention is to provide a small-sized, low-cost liquid crystal display device with electric power.

[0007]

A liquid crystal display device according to the present invention comprises a liquid crystal display element having a constant lighting region and an operating lighting region in the same plane, and a first driver for driving the liquid crystal display device. A second driver for driving the liquid crystal display element at a duty lower than that of the first driver, and the always-on region is connected to the first driver and the second driver by wiring, and lights up during the operation. The area is hard-wired to the first driver, and only the first driver is driven when operated, and only the constantly-lit area is displayed by driving the second driver when not operated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. As shown in FIG. 1, the operating lighting region 1 is connected to the high duty driver 3. The high duty driver 3 is combined with a high voltage liquid crystal power supply circuit. Further, the constantly lit area 2 is connected to the low duty driver 4. The low duty driver 4 is combined with a low voltage liquid crystal power supply circuit. The constantly lit area 2 is doubly wired to both drivers. Next, the operation and non-operation will be described respectively. Low duty driver 4 during operation
Does not operate, and the operating lighting region 1 including the constant lighting region 2 is driven by the high duty driver 3. On the other hand, when not operated, the high duty driver 3 does not operate,
The low-duty driver 4 drives the lighting region 2 at all times. When not operated, only the necessary portion is displayed with the minimum necessary power consumption consumed by the low duty driver 4.

Next, another embodiment will be described with reference to FIG. As shown in FIG. 2, the operating lighting region 1 is connected to the high duty driver 3. Further, the constantly lit area 2 is connected to the low duty driver 4. The high duty driver 3 is combined with a high voltage liquid crystal power supply circuit, and the low duty driver 4 is combined with a low voltage liquid crystal power supply circuit. In this embodiment, unlike the case of FIG.
And the constantly lit area 2 are independently wired. Next, the operation and non-operation will be described respectively. During operation, the low duty driver 4 drives the lighting region 2 at all times, and the high duty driver 3 drives the lighting region 1 during operation. On the other hand, when not operated, the high duty driver 3 does not operate, and the low duty driver 4 constantly drives the lighting region 2. When not operated, only the necessary portion is displayed with the minimum necessary power consumption consumed by the low duty driver 4.

Another embodiment will be described with reference to FIG. As shown in FIG. 3, the operating lighting region 1 is connected to the high / low duty combined driver 6. In addition, the always-lit area 2
Is also connected to the high / low duty driver 6. The high / low duty driver 6 is combined with both the high-voltage liquid crystal power supply circuit and the low-voltage liquid crystal power supply circuit so as to switch between the operating state and the non-operating state. The operation and non-operation will be described respectively. During operation, the high / low duty driver 6 is switched to the high voltage liquid crystal power supply circuit to drive the operating lighting area 1 including the constant lighting area 2. When not operated, the high / low duty driver 6 switches to the low voltage liquid crystal power supply circuit to drive the constant lighting area 2. The power consumed by displaying only the necessary portion when not operated can be suppressed to a low level.

Besides the embodiments described here, various combinations can be applied to individual products.

[0012]

As described above, a portion for displaying with high duty driving and a portion for displaying with low duty driving are provided in the same liquid crystal display element, and by switching between high duty driving and low duty driving, small size and low cost are achieved. A liquid crystal display device can be provided. It is possible to provide a highly reliable device that is extremely small in the field of small information devices that are always carried and moved without worrying about running out of battery.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the liquid crystal display device of the present invention, in which a constantly lit area 2 is doubly wired to both drivers.

FIG. 2 is an explanatory diagram of an embodiment in which the operating lighting region 1 and the constant lighting region 2 are independently wired in the liquid crystal display device of the present invention.

FIG. 3 is an explanatory diagram of an embodiment in which a high / low duty combined driver 6 is wired in the liquid crystal display device of the present invention.

FIG. 4 is an explanatory diagram of a conventional liquid crystal display device that continues high-duty driving even when not operated.

FIG. 5 is an explanatory diagram of a conventional liquid crystal display device which is divided into a liquid crystal display element 7 that is always lit when not operated and a liquid crystal display element 8 that is lit when operated.

[Explanation of symbols]

 1. Lighting area during operation 2. Constant lighting area 3. High duty driver 4. Low duty driver 5. Liquid crystal display device 6. High / low duty driver 7. Liquid crystal display device 8. Liquid crystal display element

Claims (1)

[Claims] 1. A liquid crystal display device having a constant lighting region and an operating lighting region in the same plane, a first driver for driving the liquid crystal display device, and the liquid crystal display with a duty lower than that of the first driver. A second driver for driving an element, the always-lit region is wire-connected to the first driver and the second driver, and the operation-time illuminated region is wire-connected to the first driver, A liquid crystal display device, wherein only the first driver is driven during operation, and only the always-lit region is displayed by driving the second driver during non-operation.