JPS63287827A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To enable use of a liquid crystal display device without replenishing and exchanging a power supply and to contrive miniaturization of the device by incorporating a solar battery into the liquid crystal display device and using said battery as an electric power source for displaying of liquid crystal display electrode. CONSTITUTION:The solar battery 8 is superposedly fitted between a liquid crystal display plate 1 and a reflecting plate 3 in a photodetecting direction. The liquid crystal 7 which is of a positive type allows the transmission of light through the entire surface thereof including a display pattern 2 part while a switch 4 is not pushed. This full-surface light arrives at the solar battery 8 by which the solar battery 8 is charged. An electric circuit is connected and a voltage is impressed on the liquid crystal 7 to shield the light when the switch 4 is pushed. The light in the display pattern 2b part is then shut off and the light is allowed to pass the periphery 2c of the display pattern 2b. The solar battery 8 is thereby charged at all times and the need for a power source such as battery is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display device, and particularly to a liquid crystal display device that uses liquid crystal in a display section of an air conditioner or the like.

(Prior art) Figure 3 shows, for example, Electronics December 1960 issue 5.
FIG. 6 is an explanatory diagram of an electric circuit of a conventional liquid crystal display device shown in "Application of Liquid Crystal to Watches" on page 6.

In the figure, l is a liquid crystal display plate including a liquid crystal display electrode 2, 1a is a liquid crystal display consisting of a liquid crystal 7, a liquid crystal display electrode 2, and a reflection plate 3;
2 is a liquid crystal display electrode that also serves as an electrode pattern of the liquid crystal, 3 is a reflector plate that also serves as an electrode pattern, and 4 is connected in series with the liquid crystal display electrode 2 and the liquid crystal driver 5 to display the display pattern of the liquid crystal 7. 5 is a liquid crystal driving device for driving the liquid crystal, and 6 is a power source such as a battery for the liquid crystal driving device 5.

Next, the operation of this conventional example will be explained using FIG. 3.

When the button-on switch 4 in FIG. 3 is pressed, the circuits of the liquid crystal 7, switch 4, and liquid crystal driving device 5 are connected. In this case, DC power is supplied to the liquid crystal 7 by the liquid crystal driving device 5 from a power source 6 such as a battery disposed outside the liquid crystal display panel 1 as a power source for the liquid crystal display.

In the case of negative liquid crystal 7, light passes through liquid crystal 7, and the display pattern of liquid crystal display electrode 2 is displayed. When the button-on switch 4 is not pressed, the circuit is not connected, so no voltage is applied, light is cut off, and the display pattern is turned off.

On the other hand, in the case of a positive liquid crystal 7, when the button-on switch 4 is pressed, no light passes through, and the display pattern on the liquid crystal display electrode 2 disappears, and when the switch 4 is not pressed, the display pattern is displayed. .

As described above, in order to drive the liquid crystal of this conventional example, it is necessary to incorporate a power source 6 such as a battery outside the liquid crystal display 1a as a power source for the liquid crystal display, and it is also necessary to supplement or replace the power source. Met.

(Problems to be Solved by the Invention) As described above, in the conventional example, when displaying a liquid crystal display pattern, it is necessary to incorporate a power supply for the liquid crystal drive device separately from the liquid crystal display, and There were problems that required replenishment and replacement.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to allow the liquid crystal display device to be used without replenishing or replacing the power supply of the liquid crystal drive device, and to downsize the liquid crystal display device.

[Means for solving problems]

Therefore, the present invention provides a liquid crystal display device having a liquid crystal display including a liquid crystal, a liquid crystal display electrode, and a reflection plate, and a liquid crystal drive device for driving the liquid crystal, in which a solar cell is incorporated into the liquid crystal display device, and the liquid crystal display By using the electrode as a power source for display, the above-mentioned problems are solved and the object is achieved.

[Effect]

The solar cell, which is the display power source for the liquid crystal display electrode in this invention, is stacked in the light receiving direction between the liquid crystal display electrode and the reflective plate of a positive type liquid crystal, for example, and when the power is turned on, there are characters or the like that block light. The solar cells are constantly charged by irradiating the solar cells with light that has passed through areas other than the display pattern area, or when the power is off, with light that has passed through the entire area.
DC power is supplied to the liquid crystal through the liquid crystal driver.

〔Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is an explanatory diagram of an electric circuit of a liquid crystal driving device according to an embodiment of the present invention, and FIG. 2 is a perspective and front explanatory diagram showing a solar cell charging method for the liquid crystal display device of FIG. Figure (a) is a perspective explanatory diagram showing the state of light passage when the power is turned off;
Figure 2 (a') is a front explanatory view of Figure 2 (a);
b) is a perspective explanatory view showing the passage of light other than the display pattern portion when the power is turned on, and FIG. 2(b') is a front explanatory view of FIG. 2(b).

In FIG. 1, 1 is a positive type liquid crystal display panel including a liquid crystal display electrode 2, 1a is a liquid crystal 7, a liquid crystal display electrode 2, and a reflecting plate 3.
2 is a liquid crystal display electrode that also serves as an electrode pattern for the liquid crystal, 3 is a reflective plate, 4 is connected in series with the liquid crystal display electrode 2 and a liquid crystal driver 5,
5 is a liquid crystal drive device for driving the liquid crystal, 7 is a positive type liquid crystal, and 8 is mounted between the liquid crystal display panel 1 and the reflection plate 3 in the direction of light reception. In Fig. 2, 2a is the display pattern displayed on the liquid crystal display board 1 when the switch 4 is OFF, 2b is the display pattern that is disappeared on the liquid crystal display board 1 when the switch 4 is ON, and 2C is the display pattern 2b. This is the area around which the light passes.

In the figure, the same or equivalent components as those in the conventional example are represented by the same reference numerals.

Next, the operation of this embodiment will be explained using FIGS. 1 and 2.

In Figures 1, 2 (a), and 2 (a'), when the switch 4 is not pressed, the electric circuit is not connected and no voltage is applied to the liquid crystal 7, so the liquid crystal is a positive type. 7 allows light to pass through the entire surface as shown in FIG. 2(a), including the display pattern 2a portion in FIG. 2(a'). This entire surface light reaches the solar cell 8, and the solar cell 8 is charged.

Further, in FIGS. 1, 2(b), and 2(b'), when the switch 4 is pressed, the electric circuit is connected, voltage is applied to the liquid crystal 7, and light is cut off. in this case,
By applying a voltage to a portion of the display pattern 2b, such as characters or figures in FIG. The periphery 2C of 2b allows light to pass through.

In this way, as shown in FIG. 2(b), even when the switch 4 is pressed, light reaches the solar cell, so that the solar cell is charged.

As described above, the solar cell 8 is always charged even if the switch 4 is not pressed, and the liquid crystal display device using the solar cell 8 as a DC power source can operate without difficulty.

Incidentally, in the above embodiment, the solar cells were stacked between the liquid crystal display panel and the reflector, but it is also possible to use the cell panel of the solar cell 8 as the reflector 3, which also serves as a reflector.

In this case, solar cells generally require a space or an insulation pattern to insulate between each cell, and the liquid crystal display pattern looks sharp, but the space between the cells can be ignored when visually inspected from above. This problem can be addressed by making it narrower.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a liquid crystal display device including a liquid crystal display including a liquid crystal, a liquid crystal display electrode, and a reflective plate, and a liquid crystal drive device for driving the liquid crystal, the liquid crystal display device having a solar battery. By incorporating the liquid crystal display electrode and using it as a display power source for the liquid crystal display electrode, a power source such as a battery, which has heretofore been required separately from the liquid crystal display, becomes unnecessary, and there is an effect that there is no need to replenish or replace the power source.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an electric circuit of a liquid crystal display device according to an embodiment of the present invention, and FIG. Figure (a) is a perspective explanatory diagram showing the state of light passage when the power is turned off;
Figure 2 (a') is a front explanatory view of Figure 2 (a);
b) is a perspective explanatory view showing the passage of light other than the display pattern when the power is turned on, Fig. 2(b') (d) is a front explanatory view of Fig. 2(b), and Fig. 3 is a conventional liquid crystal display. It is an explanatory diagram of the electric circuit of the device. 1-----1 liquid crystal display plate 1a-----1 liquid crystal display 2-----1 liquid crystal display electrode 3.--1 reflection plate 4-----Switch 5 -1 liquid crystal drive device 7---1 liquid crystal 8---solar cell

Claims (3)

[Claims] (1) A liquid crystal display device comprising a liquid crystal display consisting of a liquid crystal, a liquid crystal display electrode, and a reflective plate, and a liquid crystal drive device for driving the liquid crystal, wherein a solar cell is incorporated in the liquid crystal display device, and a solar cell is incorporated in the liquid crystal display device. A liquid crystal display device characterized in that it is used as a power source for display. (2) The liquid crystal display device according to claim 1, wherein the solar cell is stacked in the light receiving direction between the liquid crystal display plate and the reflection plate. (3) Claim 1, characterized in that the reflecting plate is composed of a solar battery cell panel and also serves as a reflecting plate.
The liquid crystal display device described in Section 1.