JPS6014354B2 - liquid crystal display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device using nematic liquid crystal, in particular,
The present invention relates to a liquid crystal display device in which a plurality of display sections are arranged in series (for example, in a ring shape or in a straight line).

As is well known, there are two types of nematic liquid crystals: dynamic scattering type liquid crystals whose color tone becomes cloudy depending on voltage, and field effect type liquid crystals which can produce color displays. When this field-effect nematic liquid crystal is hermetically packed between a pair of electrode plates to make a liquid crystal display cell, it exhibits negative dielectric anisotropy in which all long molecular axes of the liquid crystal are aligned perpendicular to the electrodes. It is known that the liquid crystal molecules are aligned parallel to the electrodes and have a gradually twisted nematic structure with positive dielectric anisotropy. Field-effect nematic liquid crystals, which have completely different dielectric behavior, can be used for color display by using polarizing plates, and a dramatic improvement in contrast is desired. It has the advantage of being highly practical as a device. The present invention provides a liquid crystal display that uses this nematic liquid crystal and is capable of improving the decorative effect of the display surface and improving the identification of display patterns in a liquid crystal display device in which a plurality of display sections are arranged in series. The purpose is to provide a display device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal display panel for displaying time using a nematic liquid crystal exhibiting positive dielectric anisotropy as an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a perspective view of a time display body 1 applied to a reflective type, FIG. 2 is an exploded perspective view showing its laminated state, and FIG. 3 is a central vertical sectional view of the time display body 1. As shown in FIG. 2, on both sides of the opposing surfaces of a pair of transparent electrode plates 3 and 5, electrode sections each having a shape consisting of a large number of hour display sections and minute display sections are coated with a transparent conductive film. It has been formed. There is a flat surface between the pair of transparent electrode plates.
A field-effect nematic liquid crystal exhibiting positive dielectric anisotropy is hermetically filled through the sensor 4 to form a liquid crystal layer 8. This nematic liquid crystal layer is provided oppositely in contact with the liquid crystal layer.
By wiping or polishing the facing surfaces of the pair of transparent electrode plates in a single direction with a cotton cloth or the like, the surfaces are treated in such a way that the rubbing directions are perpendicular to each other.
The long molecular axes of the liquid crystal align in a single direction along the wiped or polished electrode surface, thus exhibiting a so-called twisted nematic structure. The effect of this liquid crystal display cell is that the light beam incident from the front surface of the display surface is polarized in parallel along the rubbing direction 9 of the opposing surface of the electrode plate 3, and when the light beam passes through the liquid crystal layer, the plane of polarization of the light is rotated. The reason is that the light beam is polarized in parallel along the rubbing direction 101 of the opposing surface of the electrode plate 5 and is transmitted. A pair of polarizing plates 2 and 6, which are disposed opposite to each other on both sides of the liquid crystal display cell, have their polarization planes crossing each other, and their respective polarization axes 11,
12 is the rubbing direction 9 of each of the adjacent electrode plates 3 and 5
, 10 and are arranged parallel to each other in the same direction. Further, on one back side of the polarizing plate, a reflecting plate 7 made of white paper or the like is installed, on which a display pattern corresponding to each of the hour display section and minute display section is drawn. The reflector 7 is preferably white so as to completely reflect light, and the reflector 7 is printed with black display corners on a white background as a display pattern for the time display, or a white background with various colors corresponding to the time display. Configure the display by printing the display classification. The display pattern printed on this reflective plate is made up of a pair of electrode plates 3
, 5, which corresponds to the electrode pattern formed on the opposing surfaces of the display electrodes formed on the opposing surfaces of the display electrodes, which are overlapped and seen through.
A time display output from a separate time setting mechanism is applied to the terminal wire 13 led out from between the electrode plates to generate an electric field between the electrodes, and a display scale is used to identify the position of the display section where the time is displayed. play a role. Next, the functions of the present invention configured as described above will be described.

The respective components shown in Fig. 2 are laminated, and a field-effect nematic liquid crystal is hermetically filled between the electrode plates to form the time display body 1 as shown in Fig. 1. It affects the output. When no voltage is applied between the electrodes, natural light that enters from the front of the display screen becomes linearly polarized light on the polarization plane of the polarizing plate 2, and when it passes through the liquid crystal cell, the polarization plane of the light is rotated by 90 degrees and The light passes through the polarizing plate 6 and reaches the reflecting plate 7. Therefore, the display pattern drawn on the reflective plate 7 appears and the time display surface can be recognized. Next, a time display output from a separate clock mechanism is applied to a terminal wire 13 led out from between the electrode plates 3 and 5, and a required voltage is applied between the electrodes to generate an electric field.
The portion to which this voltage is applied, that is, the layer of the liquid crystal portion that contacts only the electrode section corresponding to the time as time passes, undergoes internal changes and the effect of rotating the plane of polarization disappears. Therefore, the light beam that has become linearly polarized by the polarizing plate 2 travels straight through the liquid crystal layer and hits the polarizing plate 6, but since the polarization plane of the polarizing plate 6 intersects with the light that has advanced, the light does not pass through. By utilizing such an effect, on the display surface on the front of the time display body, only the display section corresponding to the time does not reflect light, making it possible to display the time in a way that shows a difference in contrast from other parts. . As shown in Figure 4, this time display system consists of a large number of display sections, including hour display sections and minute display sections.As the time progresses, the minute display section sequentially integrates and displays the minutes; The time is displayed by sequentially transitioning the corresponding display section. The display screen shown in FIG. 4 is displaying 1:15. According to such a display method, it is possible to provide a time display with a progressively innovative effect, unlike a time display using a hand or a digital numeric display, and moreover, it is easy to discuss the time. has advantages. Next, as another embodiment, a transmission type time display body 1 will be illustrated and explained in FIGS. 5 to 8.

In the case of this transmission type, a coating is formed on one side of the transparent electrode plate, for example, on the back side of the electrode plate 5, to depict display patterns having the shapes of hour display sections and minute display sections, and to transmit light rays. By arranging the layers,
It has the effect of making the time display surface appear, similar to the case of the reflective type described above. This coating layer forms the display pattern 14 by printing time display corners on the transparent electrode plate or by color printing to transmit colored light. Since this transmissive time display does not use a reflective plate, the display surface appears at the front and back of the time display, making it possible to identify the time when viewed from either direction. The clock mechanism may be attached to the side surface of the time display body or at an appropriate location. Therefore, on the time display surface, the time is displayed by configuring the display surface as shown in FIG. 8, for example, so that the hour display and minute display can be identified from either direction. The display screen shown in FIG. 8 is displaying 1:15. Furthermore, as another example, in both the reflective type and the transmissive type, one polarizing plate is provided with a transparent material such as a plastic film,
By using a dichroic polarizing plate, in which a pair of polarizing plates with polarization planes whose polarization axes cross each other are laminated in a sandwich manner on both sides, a certain color light with a display section corresponding to the time can be reflected or transmitted. The display body that appears on the display screen can be constructed using the following methods.

For example, in the case of a reflective type, when one polarizing plate 6 is a dichroic polarizing plate, the display surface is white, and the display section corresponding to the time is displayed in each color, for example, red, the reflective plate 7 By dyeing the polarizing plane of the polarizing plate facing the clock with a red dye, it is possible to sequentially display the time in red on a display surface having display intervals on a white background. In addition, when the display surface is to be colored in each color, for example, a blue background, by dyeing the polarizing plane of the polarizing plate facing the electrode plate 5 of the polarizing plate 6 with a colored dye, red is sequentially applied to the blue display surface. The time can be displayed. The relationship between the ground color of the display surface and the color of the display section displaying the time is combined as shown in FIG. As described in detail above, the liquid crystal display device of the present invention has a visible pattern portion that depicts the shape of the entire display section in correspondence with a plurality of display sections for performing analog display on the reflector plate, electrode plate, polarizing plate, etc. Since the arrangement shape of the entire plurality of display sections can be visually recognized at all times, the entire analog display section can be viewed even if there are display sections that are not displayed, and the decorative effect is significantly improved. This makes it very easy to read the position of the display section being driven.

Therefore, the liquid crystal display device of the present application is particularly effective for use in display devices that not only require decorativeness but also require instantaneous reading of information, such as a display device for a wristwatch or a display device for a table clock. .

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a reflective time display to which the present invention is applied, Fig. 2 is an exploded perspective view thereof, Fig. 3 is a central vertical sectional view thereof, Fig. 4 is a display pattern diagram of the display surface, 5 is a perspective view of a transmission type time display to which the present invention is applied, FIG. 6 is an exploded perspective view thereof, FIG. 7 is a central vertical sectional view thereof, FIG. 8 is a display pattern diagram of the display surface, and FIG. 9 The figure is a table showing the relationship between color tones on the display surface. 1... Time display body, 2, 6... Polarizing plate, 3, 5...
・Transparent electrode plate, 4... baser, 7... reflective plate,
8...Liquid crystal layer, 9,10...Rubbing direction, 11,1
2... Polarization axis, 13... Terminal line, 14... Display pattern diagram. Figure 1 Figure 3 Figure 2 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Scope of Claims] 1. Electrodes for selectively displaying a plurality of display sections arranged in series are provided on the opposing inner surfaces of a pair of substrates that are arranged opposite to each other with a nematic liquid crystal interposed therebetween, and information is displayed in an analog manner. In the liquid crystal display device, a reflective plate is provided behind one of the pair of substrates, and display segments are formed on the reflective surface of the reflective plate to correspond to each of the plurality of display segments. 1. A liquid crystal display device comprising: a visible pattern portion depicting a shape of the plurality of display sections, the visible pattern portion allowing the arrangement shape of the plurality of display sections to be visually recognized at all times. 2. Electrodes for selectively displaying a plurality of display segments arranged in series are provided on the opposing inner surfaces of a pair of substrates that are placed opposite each other with a nematic liquid crystal interposed therebetween, so that information can be displayed in an analog manner. In the liquid crystal display device, one of the pair of substrates is provided with a visible pattern section that depicts the shape of the display section in correspondence with each of the plurality of display sections, and the visible pattern section depicts the shape of the display section. 1. A liquid crystal display device characterized in that the arrangement shape of is made visible at all times. 3. Electrodes for selectively displaying a plurality of display sections arranged in series are provided on the opposing inner surfaces of a pair of substrates that are arranged opposite to each other with a nematic liquid crystal interposed therebetween, so that information can be displayed in an analog manner. In the liquid crystal display device, a plate-like light transmitting member is provided by overlapping the pair of substrates, and a visible pattern depicting the shape of the display segment corresponding to each of the plurality of display segments is provided on the light passing member. 1. A liquid crystal display device, characterized in that the visible pattern portion allows the arrangement shape of the plurality of display sections to be visually recognized at all times.