JP2587930B2 - Liquid crystal display device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a negative display liquid crystal display (LCD) mounted on a camera or the like and imprinting a date or the like on a photographic film.

`` Conventional technology '' Conventionally, as a transmissive negative display liquid crystal display element for mounting the date and time of shooting on a photographic film, which is mounted on a camera or the like, a portion except for a display pattern is covered with a mask layer,
It is known that the transmission of light in the background portion is more reliably blocked. In such a liquid crystal display element, the display pattern is inevitably fine because the external dimensions of the camera are small, so that it is difficult to apply black mask ink by offset printing or the like. Is used, and a mask layer made of chromium sputtered with chromium is formed.

As a liquid crystal display element having such a chromium mask layer formed thereon, for example, there is a liquid crystal display element having a display pattern shown in FIG. 2 and a structure shown in FIG. In these figures, reference numeral 1 denotes a negative liquid crystal display element,
The liquid crystal display element 1 is mounted on a camera and is for imprinting a date (photographing date) on a photographic film.
This liquid crystal display element 1 is composed of a liquid crystal cell 2 as shown in FIG.
And an upper polarizing plate 3 and a lower polarizing plate 4 whose polarizing axes are respectively attached to the upper and lower surfaces of the liquid crystal cell 2 in the same direction. The liquid crystal cell 2 has a liquid crystal layer 7 formed between an upper glass substrate 5 and a lower glass substrate 6 and a sealing material 8.
Thus, the liquid crystal layer 7 is hermetically sealed. On the inner surface of the upper glass substrate 5, there are formed segment electrodes 9, 9... For forming a display pattern, and an alignment film 10 is laminated so as to cover the segment electrodes 9, 9,. A common electrode 11 is formed on the inner surface of the lower glass substrate 6, and a silver-gray chromium (Cr) layer 1 is further formed thereon as a mask layer.
2, 12 ... are formed. Here, the chrome layers 12, 12 ...
Are not formed on the segment electrodes 9, 9,... In order to prevent a short circuit because they are conductors themselves.
Further, on the common electrode 11, an alignment film 13 is formed so as to cover the chromium layers 12, 12,. And between the alignment film 10 of the upper glass substrate 5 and the alignment film 13 of the lower glass substrate 6,
Liquid crystal is filled.

In order to imprint a date or the like on a photographic film by the liquid crystal display element 1 having such a structure, as shown in FIG. The lower glass substrate 6 side is arranged on the light source 21 side, and then the light source 21 built in the camera emits light. Then, the light enters the prism 22 as shown by the solid line in FIG. 4, is refracted by the prism 22, and enters the lower glass substrate 6 side of the liquid crystal display element 1. The light transmitted through the liquid crystal display element 1 and emitted from the upper glass substrate 5 reaches the back surface of the photographic film 20, whereby the photographic film 20 exposes a display pattern on the back surface.

“Problems to be Solved by the Invention” In the above-described liquid crystal display device 1, when the display pattern is exposed on the photographic film 20, the light transmitted through the liquid crystal display device 1 and reaching the photographic film 20 is reduced. 4 are reflected again from the upper glass substrate 5 side of the liquid crystal display element 1 as shown by the broken line in FIG. 4, and further reflected on the silver gray chrome layers 12, 12. When the light enters the photographic film 20, the outer shape of the liquid crystal display element 1 is exposed to the photographic film 20.

"Means for solving the problems" Therefore, in the liquid crystal display device of the present invention, a lower glass substrate disposed on the light source side and having a common electrode formed on the entire surface, and a segment electrode disposed on the photographic film side and comprising a display pattern An upper glass substrate formed with a liquid crystal layer interposed between the upper and lower glass substrates, a chromium layer is laminated on a portion of the common electrode not facing the segment electrode, and a chromium oxide layer is laminated on the chromium layer. Solved the problem.

[Operation] The liquid crystal display element of the present invention is provided with a light-blocking chromium layer and a chromium oxide layer on the common electrode of the lower glass substrate disposed on the light source side, so that light transmitted through the liquid crystal display element is transmitted. Even if the light is reflected and re-enters the photographic film, the chromium oxide layer absorbs most of the light, so that the reflection by the chromium layer is controlled and the manufacturing process of the lower glass substrate is simplified.

Embodiment FIG. 1 is a diagram showing an embodiment of the liquid crystal display device of the present invention. In this figure, the same elements as those shown in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.

The liquid crystal display element shown in FIG. 1 differs from the liquid crystal display element 1 shown in FIG. 3 in that a chromium oxide layer is laminated on the chromium layers 12, 12,. In FIG. 1, the segment electrodes 9, 9,... Laminated on the upper glass substrate 5 of the liquid crystal cell 2 constitute the display pattern A shown in FIG. , Etc.). On the lower glass substrate 6, a common electrode 11 is laminated on the entire inner surface except for the portion where the sealing material 8 is disposed. On the common electrode 11, hatching other than the display pattern A shown in FIG. The chromium layers 12, 12,... Are formed at positions corresponding to the indicated portion B. These chrome layers 12, 12
… Has a green chromium oxide (Cr ₂ O ₃ ) layer 14, 1 on its surface
4 ... are formed. Here, the thickness of the chromium layers 12, 12,... Is about 120 nm, and the thickness of the chromium oxide layers 14, 14,.

In order to manufacture the liquid crystal display element 1 having such a structure, chromium layers 12, 12... Are formed on the common electrode 11 of the lower glass substrate 6 by sputtering, and the chrome layers 12, 12,.
The chromium oxide layers 14, 14... Are formed on the... 12 by sputtering, and then assembled to the liquid crystal display element 1 in the same manner as the conventional one.

In order to imprint a date on a photographic film by using such a liquid crystal display device 1, as in the case of the conventional liquid crystal display device 1 shown in FIG. 3, the date was first built into the camera as shown in FIG. The light source 21 emits light. Then, the light enters the prism 22 as shown by the solid line in FIG. 4, is refracted by the prism 22, and enters the lower glass substrate 6 side of the liquid crystal display element 1. Then, the light passes through the liquid crystal display element 1 and passes through the upper glass substrate 5.
The light emitted from the side reaches the back surface of the photographic film 20, whereby the photographic film 20 exposes a display pattern on the back surface. Here, since the liquid crystal display element 1 is mounted on the camera with the sealing material 8 covered with the window frame, light leakage is reliably prevented. In this case, a part of the light reaching the photographic film 20 is reflected and reenters the liquid crystal display element 1 from the upper glass substrate 5 side as shown by a broken line in FIG. Since most of the light is absorbed by the chromium oxide layers 14, 14, the reflection by the chromium layer 12 can be suppressed.

In this embodiment, the chromium layer 12 is formed on the inner surface of the lower glass substrate 6 and the chromium oxide layer 14 is formed on the chromium layer 12. However, the chromium layer 12 is formed on the outer surface of the lower glass substrate 6. In this case, the chromium layer 12 is formed on the chromium oxide layer 14. That is, if the chromium oxide layer 14 is disposed on the front side of the chromium layer 12 with respect to the photographic film 20, the reflected light from the photographic film 20 can be absorbed by the chromium oxide layer 14.

"Effects of the Invention" As described above, the liquid crystal display element of the present invention has a chromium layer laminated on a portion not facing the segment electrode on the common electrode of the lower glass substrate disposed on the light source side,
Since the chromium oxide layer is laminated on the chromium layer, the chromium oxide layer can suppress the reflection of the light incident from the upper glass substrate side on the chromium layer. By absorbing most of the reflected light from the film with the chromium oxide layer, it is possible to prevent the reflected light from being reflected by the chromium layer and being incident on the film again to capture the outer shape of the liquid crystal display element.
Also, the light reflected from the photographic film is absorbed by the chromium oxide layer of the lower glass substrate disposed on the opposite side of the film, and the light from the light source is blocked by the black chrome layer of the lower glass substrate. Therefore, there is no need to consider the internal reflection of the upper and lower glass substrates, only one surface of the chromium oxide layer absorbs the reflected light, and the common electrode, chrome layer, and chromium oxide layer of the lower glass substrate are on the same side. Thus, a series of forming steps, for example, a series of sputtering formations can be performed, so that the manufacturing process of the glass substrate can be simplified and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part showing one embodiment of a liquid crystal display device of the present invention, FIG. 2 is an enlarged front view showing a display pattern of the liquid crystal display device according to the present invention, and FIG. FIG. 4 is an explanatory view for explaining a mechanism in which the liquid crystal display element according to the present invention is mounted on a camera and imprints a film date. DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display element, 2 ... Liquid crystal cell, 5 ... Upper glass substrate, 6 ... Lower glass substrate, 9 ... Segment electrode, 11
…… Common electrode, 12… Chromium layer, 14… Chromium oxide layer.

Claims (1)

(57) [Claims] 1. A lower glass substrate disposed on a light source side and having an entire surface common electrode formed thereon, an upper glass substrate disposed on a photographic film side and having a segment electrode formed of a display pattern formed thereon, and between the upper and lower glass substrates. And a liquid crystal layer interposed between the common electrode and the chromium layer on the common electrode, and a chromium oxide layer on the chromium layer.