JPH01161220A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To obtain display appropriate for the property of the display of each display part by constituting either of 1st and 2nd layers as a simple dot matrix liquid crystal display element (LQDE) and constituting the other as a static LQDE. CONSTITUTION:The 1st and 2nd layers 11, 11' are respectively constituted as a simple dot matrix LQDE and a static LQDE and the display of the 1st layer 11 and that of the 2nd layer 11' are respectively independently executed. In a part such as a speed meter requiring a rapid response, display is executed by an electrode pattern of the static LQDE in the 2nd layer 11', and in case of a display part such as a fuel meter or an alarm display for water temperature, hydraulic pressure, etc., having a comparatively small change, display is executed by an electrode pattern of the simple dot matrix LQDE in the 1st layer 11. Thus, optimum display corresponding to the property of each display can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display device suitable for an information display for automobiles.

[Conventional technology and problems]

In recent years, computers have come to be used to control and adjust automobiles, and along with this, speedometers.

Liquid crystal display devices are increasingly being used to display various information such as tachometers, fuel gauges, and various warning displays such as water temperature and oil pressure. As such displays, simple dot matrix liquid crystal display devices have conventionally been widely used to perform all of the above-mentioned displays.

By the way, when displaying the above various information, the speedometer 1
Displays such as tachometers require fast response and high visibility, while fuel gauges and water temperature display.

Displays that do not change relatively often, such as warning displays for oil pressure, etc., are displayed on the same liquid crystal display device, so if the entire display is displayed using a simple matrix liquid crystal display element, changes in the speedometer, 2-tachometer, etc. Visibility is not very high when the display is intense, and when displaying with a static liquid crystal display element, it is difficult to display a variety of warning displays to call attention. It could not be said that it was suitable for information displays.

[Purpose of the invention]

In view of the above points, the present invention provides high-speed response and high visibility in parts that require high-speed response, such as speedometers, and compares warning displays such as fuel gauge and water temperature and oil pressure. It is an object of the present invention to provide a liquid crystal display device which is suitable for an information display for automobiles and is capable of displaying a wide variety of displays in a display area where there is little change in appearance.

[Means and actions for solving the problem] The above purpose is:
According to the present invention, in a two-layer liquid crystal display device, either the first layer or the second layer is configured as a simple dot matrix liquid crystal display element, and the other layer is configured as a static liquid crystal display element. This is achieved by being present.

According to this invention, the liquid crystal display device has a two-layer structure, one layer is composed of a simple dot matrix liquid crystal display element, and the other layer is composed of a static liquid crystal display element, thereby achieving high-speed response in speedometers and the like. Static liquid crystal display elements can be used to display parts that require high performance, and simple dot matrix liquid crystal display elements can be used to display parts that require relatively little change, such as fuel gauge, water temperature, oil pressure, and other warning displays. This allows each display area to have a display suitable for its display characteristics, that is, a display with high-speed response and high visibility, as well as a variety of displays that call for attention. Since this element is used, a liquid crystal display device that can be manufactured at relatively low cost and is ideal for information displays for automobiles and the like can be obtained.

〔Example〕

The present invention will be described in detail below based on one embodiment shown in one drawing.

FIG. 1 is a schematic cross-sectional view of one embodiment of a liquid crystal display device according to the present invention, and the liquid crystal display device 10 is a two-layer liquid crystal display device consisting of a first layer 11 and a second layer 11 degrees, Glass substrates 12, 12' and 13 arranged parallel to each other
．． Transparent electrodes are provided on mutually opposing surfaces of each of the electrodes 13'. That is, on the lower surfaces of the first glass substrate 12 and the third glass substrate 13, transparent electrodes having a predetermined pattern (not shown) are disposed over the entire surface, and the second glass substrate 12 Transparent electrodes having a predetermined pattern (not shown) are provided on the upper surfaces of the glass substrates 13 and 13, respectively.

Furthermore, the opposing surfaces of each of the glass substrates 12.12'' and 13.degree. The upper surface and the lower surface of the glass substrate 13 are oriented in the direction perpendicular to the drawing.The space between the first glass substrate 12 and the second glass substrate 12' and the space between the third glass substrate 13 and the fourth glass substrate Substrate 13'
A liquid crystal 14 is injected into each space between them, and the space is sealed by a sealing material (not shown) applied around the space, thus forming a first layer 11 and a second layer 11'.

In this case, the first layer 11 is configured as a simple dot matrix liquid crystal display element, and the second layer 11'' is configured as a static liquid crystal display element. Upper, second glass substrate 1
Polarizing plates 15, 16, and 17 are provided below the glass substrate 2'' and the fourth glass substrate 13'', respectively, and the polarizing plates 15 and 17 have polarized light absorption characteristics in the direction perpendicular to the drawing, and also absorb polarized light. The plate 16 has polarized light absorption characteristics in the horizontal direction in the drawing.

Furthermore, a light source 18 for back illumination is provided below the polarizing plate 17.

The liquid crystal display device 10 according to the present invention is constructed as described above, and when the current is not applied, the molecules of the liquid crystal 14 in the first layer 11 and the second layer 11'' are arranged as shown in FIG. They are aligned along the orientation direction on the opposing surfaces of the glass substrates 12, 12' and 13° 13'', and the light from the light source 18 becomes polarized light with a polarization direction in the horizontal direction in the drawing by the polarizing plate 17. After passing through the second layer 11' and further passing through the polarizing plate 16, while the polarization direction is rotated by 90 degrees according to the liquid crystals 14 which are twisted and aligned within 11 degrees of the two layers,
The light enters the first layer 11 and similarly passes through the first layer 11, but is absorbed by the polarizing plate 15. As a result, an off display is performed.

Here, if only the second layer 11' is turned on, the second layer 1
The molecules of the 1" liquid crystal 14 are aligned perpendicularly from the third glass substrate 13 to the fourth glass substrate 13', so that the light #
The light from 18 is turned into polarized light by the polarizing plate 17 with a polarization direction in the left and right direction of the mouth surface, and is transmitted through the second layer 11'.
The light is absorbed by the polarizing plate 16, and thus an off display is performed in this case as well.

Next, when only the first layer 11 is turned on, the liquid crystals 14 of the first layer 11 are aligned vertically, and the light from the light source 18 passes through the second layer 11' and the polarizing plate 16 as described above, and then passes through the second layer 11' and the polarizing plate 16. One layer 11
Then, the light is transmitted through the polarizing plate 15, and the dot matrix electrode pattern of the first layer 11 is turned on. Furthermore, when the first layer 11 and the second layer 11'' are turned on at the same time, a display is obtained in which the ON display of the electrode pattern of the first layer 11 is superimposed with the OFF display of the static electrode pattern of the second layer 11°.

Thus, the liquid crystal display device 10 can display the first layer 11 and
The display on the second layer 11" will be performed independently. Therefore, for parts such as speedometers that require high-speed response, the display will be performed using the electrode pattern of the static liquid crystal display element on the second layer 11". If this is done, and the parts of the display that do not change comparatively, such as warning displays for the fuel gauge, water temperature, oil pressure, etc., are displayed using the electrode pattern of the simple dot matrix liquid crystal display element of the first layer 11.
An optimal display can be obtained depending on the nature of each display.

FIG. 2 shows another embodiment of the present invention, in which the liquid crystal display device 10'' is different from the embodiment of FIG.
1 is configured as a static liquid crystal display element, the second layer 11' is configured as a simple dot matrix liquid crystal display element, and the polarization directions of the polarizing plates 15 and 17 are rotated by 90 degrees. As in the case of the embodiment shown in FIG. 1, when the second layer 11'' is turned on, the dot matrix electrode pattern of the second layer 11'' is turned on; 11' turns on, a display is made in which an on display of the dot matrix electrode pattern of the second layer 11' is superimposed with an off display of the static electrode pattern of the first layer 11.

Further, FIG. 3 shows an embodiment in which the polarizing plate 16 disposed between the second glass substrate 12'' and the third glass substrate 13 is omitted in the embodiment of FIG. The operation is similar to that of the embodiment shown in FIG. Accordingly, the first layer 11 is turned on and the second layer 11'' is turned off.

FIG. 4 shows the second glass substrate 1 in the embodiment shown in FIG.
This shows an embodiment in which the polarizing plate 16 disposed between the second layer 11'' and the third glass substrate 13 is omitted, and in this case as well, when the second layer 11'' is turned on, the second layer 11'' is turned on. However, by turning on the first layer 11 and the second layer 11', the first layer 11
The off display of the second layer 11'' and the off display of the second layer 11'' are performed.

〔Effect of the invention〕

As described above, according to the present invention, in a two-layer liquid crystal display device, either the first layer or the second layer is configured as a simple dot matrix liquid crystal display element, and the other layer is configured as a static liquid crystal display element. Since the liquid crystal display device has a two-layer structure, parts that require high-speed response such as the speedometer are displayed using a static liquid crystal display element, and warnings such as the fuel gauge, water temperature, and oil pressure are displayed. In the display portion where the display changes relatively little, the display can be performed using a simple dot matrix liquid crystal display element.

Therefore, each display part can have a display with high-speed response and high visibility that is suitable for its display characteristics, and a variety of displays that call for attention.Moreover, it uses a simple dot matrix liquid crystal display element. This means that it can be manufactured at relatively low cost.

Thus, according to the present invention, high-speed responsiveness and high visibility can be obtained in parts that require high-speed responsiveness, such as the speedometer, and also in parts that require high-speed responsiveness, such as the speedometer.

An extremely excellent liquid crystal display device can be provided which is suitable for automatic military information displays and the like, and is capable of displaying a wide variety of displays in areas where warning displays such as oil pressure display have relatively little change.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of one embodiment of the liquid crystal display device according to the present invention, and FIGS. 2, 3, and 4 are schematic sectional views showing other embodiments of the liquid crystal display device according to the present invention. be. 10.10'...Liquid crystal display device; 11...First layer;
11"...Second layer; 12, 12°, 13.13' ・
...Glass substrate; 14...Liquid crystal; 15, 16.17.
...Polarizing plate; 18...Light source. Patent applicant: Stanley Electric Co., Ltd. Representative: Patent attorney Hirayama - Muroma: Patent attorney Kaizu Tamotsu 3F+1
- See 1- (to) (N (Y') -(-QP+
, , =

Claims (1)

[Claims] A liquid crystal display device with a two-layer structure, characterized in that either the first layer or the second layer is configured as a simple dot matrix liquid crystal display element, and the other layer is configured as a static liquid crystal display element. , liquid crystal display device.