JP2953869B2 - LCD display - Google Patents

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, and more particularly to a liquid crystal display which is hardly affected by an ambient temperature.

[0002]

2. Description of the Related Art A well-known liquid crystal display device accommodates a liquid crystal in an empty space formed by two glass plates and a sealing material for separating the two glass plates by a certain distance, A common electrode is formed on one of the two glass plates in the room, a segment electrode is formed on the inner surface of the other glass plate, and a voltage is applied between the segment electrode and the common electrode selected according to the display contents. Thus, the display action is performed by changing the characteristics of the liquid crystal in the selected segment portion and changing the color with other portions. In some cases, the electrodes are arranged in a grid pattern.

[0003]

A liquid crystal display is often used by itself, or together with a built-in electronic device, by being moved and carried. For this reason, the operating temperature varies depending on the location, and particularly when used in severe cold, display responsiveness deteriorates or dew condensation occurs, and the temperature is easily affected. In particular, liquid crystals have intermediate characteristics between liquid and solid, so the display characteristics change significantly with temperature,
In addition, there is a problem that the operating temperature range is strongly restricted.

The present invention has been made in view of the above problems, and has as its object to provide a liquid crystal display capable of obtaining predetermined display characteristics without being affected by ambient temperature.

[0005]

The liquid crystal display of the present invention comprises a liquid crystal contained in an empty space formed by two glass plates and a sealing material, wherein at least one of the glass plates is provided. A transparent conductor that is formed on the surface and generates heat when energized also serves as a display electrode of the liquid crystal display. In this liquid crystal display, for example, even when the ambient temperature is low, by energizing the transparent conductor pattern, the temperature of the liquid crystal can be raised by the generated Joule heat and an appropriate temperature can be obtained, so that constant display characteristics are always obtained. be able to.

[0006]

The present invention will be described in more detail with reference to the following examples. FIG. 1 is a plan view showing an example of the arrangement of a transparent conductor pattern on a glass plate on one side of a liquid crystal display showing one embodiment of the present invention. FIG. 2 is a sectional view of the liquid crystal display of the embodiment. In the liquid crystal display 10 of this embodiment, a transparent segment electrode 2 for display is formed on the inner surface of an upper glass plate 1. In FIG. 1, reference numeral 4 denotes a sealing material.

In the liquid crystal display of this embodiment, as shown in FIG. 2, a liquid crystal 5a is housed in an empty space formed by two glass plates 1, 5 and a sealing material 4. A segment electrode 2 covered with polyimide 7 is formed on the back surface of the glass plate 1, and a common electrode 6 covered with polyimide 8 is provided on the upper surface of the glass plate 5, that is, on the inner surface. The common electrode 6 is also used as a transparent conductor pattern for temperature adjustment. Further, polarizing plates 9 and 11 are arranged outside the glass plates 1 and 5, respectively. However, the liquid crystal display having the above configuration is already well-known except that the common electrode and the transparent conductor pattern for temperature adjustment are also used.

FIG. 3 is a plan view of the lower surface of the liquid crystal display according to the embodiment of the present invention. The feature of the embodiment of the present invention is that, as shown in FIG. 3, the common electrode 6 is also used as a transparent conductor pattern for energization for temperature adjustment. In this liquid crystal display, the applied voltage for energization is applied so as to overlap the common voltage waveform. However, the applied voltage has a frequency that does not affect the liquid crystal display function.

A feature of the liquid crystal display 10 of this embodiment resides in that the common electrode 6 is also used as the transparent conductor pattern 3 for temperature adjustment. The AC signal source 1
According to 2, when electricity is supplied, Joule heat is generated, and this heat can keep the temperature of the liquid crystal display 10 constant. In particular, even when the liquid crystal display is used in a low-temperature environment, the temperature can be maintained at a predetermined temperature. Therefore, the use effect is large, the response speed at low temperatures is prevented from lowering, and the operating temperature range can be expanded. Also, if the temperature of the liquid crystal display is kept constant at the maximum value of the operating temperature, it is possible to make the characteristics constant within the entire operating environment temperature range.

In the above-described embodiment, the case where the transparent conductive pattern for energization is provided on the inner surface of the glass plates 1 and 5, that is, in the liquid crystal gap, but the transparent conductive pattern for energization is provided on the outer surface of the glass plate. May be formed. In this case, the power supply for energization may be either AC or DC.
Further, in the above embodiment, the case where the display unit is a character segment of the day has been described as an example, but it is needless to say that the present invention can be applied to other display formats such as a dot type.

[0011]

According to the present invention, since the transparent conductor pattern formed on at least one surface of the glass plate and generating heat when energized also serves as a display electrode of the liquid crystal display, there is no problem. By applying electricity to this transparent conductor pattern, the generated heat can maintain the liquid crystal display at a constant temperature without the need to add or increase the electrode pattern shape, even if the ambient temperature becomes extremely low. Therefore, constant display characteristics can be obtained without being affected by the ambient temperature.

[Brief description of the drawings]

FIG. 1 is a plan view showing a display segment pattern of a liquid crystal display according to an embodiment of the present invention and a transparent conductor pattern for energization.

FIG. 2 is a cross-sectional view of an example liquid crystal display.

FIG. 3 is a plan view showing a common electrode and a current-carrying transparent conductor pattern of the liquid crystal display of the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Glass plate 2 Display segment electrode 6 Transparent conductor pattern for both temperature adjustment and common use 12 AC signal source

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G02F 1/133 580

Claims (1)

(57) [Claims] 1. A liquid crystal display in which a liquid crystal is stored in an empty space formed by two glass plates and a sealing material, wherein the liquid crystal display is formed on at least one surface of the glass plate.
A liquid crystal display, wherein a transparent conductor pattern that generates heat when energized also serves as a display electrode of the liquid crystal display.