JPH0564827U - Liquid crystal display - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to provide a liquid crystal display device that can display secret documents and the like even in the public place and is useful for learning the properties of light. The configuration is such that no polarizing plate is arranged on the surface of the liquid crystal portion in which the display content can be visually recognized only by irradiating light rays or looking through an external polarizing plate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid crystal display device used in a display unit of an electric product.

[0002]

[Prior Art]

 A liquid crystal display device with low power consumption is used for a display unit of a desktop computer, a word processor, a wrist watch, a notebook electronic storage device, or the like. Recently, liquid crystal has been used even for TV screens.

[0003]

[Problems to be solved by the device]

 By the way, there are many matters that must be kept secret in the contents displayed on a display device such as an electronic computer or a word processor. Therefore, if these are used in places where outsiders often come and go, secrets may leak to the outside. The present invention has been made in view of such circumstances, and an object thereof is to provide a novel liquid crystal display device capable of solving the above problems.

[0004]

[Means for Solving the Problems]

 In order to achieve such an object, the liquid crystal display device according to the present invention has a polarizing plate on the surface of the liquid crystal part in which the displayed contents can be visually recognized only by irradiating a polarized light beam or through an external polarizing plate. The configuration is not arranged.

[0005]

[Action]

 According to the above configuration, for example, when the liquid crystal display device is mounted on a word processor and the user wears glasses using a polarizing plate when using the word processor, only the user can display the liquid crystal part on the liquid crystal part. The displayed contents can be read.

Further, for example, when the device is attached to a notebook type electronic storage device and the polarizing plate is placed on the liquid crystal part to read the display contents when it is used, the polarizing plate can be removed when not in use. You can prevent people who do not have the content from reading it.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings showing an embodiment thereof. For comparison, FIG. 1 shows a cross section of the configuration of the conventional liquid crystal display device 1. This shows that a polarizing plate c is arranged on the front surface of the liquid crystal part 2 and a polarizing plate d is arranged on the rear surface thereof, and the displacement of the liquid crystal part 2 is changed. Is visually recognizable, and the visibility is further enhanced together with the reflector 4.

On the other hand, FIG. 2 shows a cross section of a liquid crystal display device according to an embodiment of the present invention when viewed from the side. As shown in FIG. No polarizing plate is provided on the front surface of the sheet, and the polarizing plate d and the reflecting plate 4 are provided on the back surface thereof. As a result, the liquid crystal part 2 cannot be visually recognized unless the liquid crystal part 2 is viewed from the front side through the external polarizing plate or the surface is irradiated with polarized light.

That is, in a normal state, as shown in FIG. 3, even if an electric field is applied to the first part (the part surrounded by the broken line) 22 of the liquid crystal part 2 so that the liquid crystals are aligned in one direction, the first part Both the portion 22 and the second portion (the portion other than the portion surrounded by the broken line) 23 are in a state where the reflector 4 can be seen through the liquid crystal portion 2 and the polarizing plate d on the back surface, and are displayed on the liquid crystal portion 2. I don't understand what it says.

On the other hand, for example, when a person wearing polarized glasses (glasses in which the external polarizing plate 5 is attached to the spectacles part) looks at the liquid crystal part 2, the first part 22 looks black as shown in FIG. The other second portion 23 is seen through the reflection plate 3 and appears white. That is, a desired character or picture can be seen in the liquid crystal part as if it were a normal liquid crystal display device. If the polarizing plate is rotated 90 degrees or the front and back sides are reversed, the black and white characters and pictures are reversed.

The liquid crystal display device 1 is configured as described above. For example, if the liquid crystal display device 1 is used as a display for a word processor, a personal computer, etc., and only the operator puts the eyeglass with the polarizing plate on, the operator can hit it. The letters etc. do not look like anything other than the operator. Therefore, it is possible to create texts that you do not want outsiders to see, regardless of the location.

Of course, if the external polarizing plate 5 is provided so as to be separable and the polarizing plate 5 is placed on the liquid crystal part 2 at the time of use, it can be used similarly to a conventional liquid crystal display device. When not in use, it may be removed and stored in another place. Further, as shown in FIG. 5, the polarizing plate 5 may be inserted between the light source 6 and the liquid crystal unit 2 so that only the polarized light beam is applied to the liquid crystal unit 2. Even in this case, the display content of the liquid crystal section 2 can be visually recognized as if it were viewed through the polarizing plate.

Moreover, for example, while drawing a design on the surface of the reflection plate 4 and displaying another design on the liquid crystal part 2, the polarizing plate 5 may be inserted between the light source 6 and the liquid crystal part 2. Otherwise, the pattern on the surface of the reflection plate 4 and the pattern on the liquid crystal part 2 will appear alternately, producing a magic mirror effect, which can be used as a new advertising means. The liquid crystal display device according to the present invention is not limited to the above-mentioned embodiment, but can be applied to a transmissive type in which no reflector is arranged.

[0014]

[Effect of the device]

 As described above, the liquid crystal display device according to the present invention has no polarizing plate on the surface of the liquid crystal part so that the display content can be visually recognized only by irradiating the polarized light or looking through the external polarizing plate. A person who does not have a polarizing plate or polarizing glasses cannot read the display content displayed on the liquid crystal part.

Therefore, the secret document or the like can be displayed even in a place where an outsider frequently enters and leaves. Also, by attaching or removing the deflector plate, the contents displayed on the liquid crystal can be read or not read, so children can be interested in the effect of the polarizing plate and educate the nature of light. It can also be applied as an educational toy.

[0016] Furthermore, a pattern is drawn on the reflection plate, and the liquid crystal part is irradiated or not irradiated with light through the polarizing plate, so that the pattern drawn on the reflection plate and the liquid crystal part are displayed. It will be displayed alternately with the design, and can be used as a new display means for advertising effects.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a conventional liquid crystal display device.

FIG. 2 is a cross-sectional view showing an embodiment of a liquid crystal display device according to the present invention.

FIG. 3 is an explanatory diagram showing a state of the liquid crystal portion when viewed without being polarized.

FIG. 4 is an explanatory diagram showing a state of a liquid crystal portion viewed through an external polarizing plate.

FIG. 5 is an explanatory diagram showing a state where the liquid crystal portion is viewed when a polarizing plate is inserted between the light source and the liquid crystal portion.

[Explanation of symbols]

 1 Liquid crystal display device 2 Liquid crystal part 5 External polarization plate 6 Light source

Claims (1)

[Scope of utility model registration request] 1. A liquid crystal display device characterized in that a polarizing plate is not disposed on the surface of a liquid crystal portion whose display contents can be visually recognized by irradiating a polarized light beam or by looking through an external polarizing plate.