JPS6315894Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Technical Field] The present invention relates to a reflective guest-host liquid crystal display device in which a polarizing means for incident light is placed isolated from a liquid crystal display panel. [Prior art] The present invention is a liquid crystal television (hereinafter referred to as GH panel) that uses a guest host liquid crystal image display panel (hereinafter referred to as GH panel).
Since it is extremely effective for the practical application and high quality of LC-TV (abbreviated as LC-TV), the LC-TV of the GH panel will be described below, both as a conventional example and an embodiment of the present invention. A conventional LC-TV uses a light shielding hood 1 as shown in FIG. The reason for using light-shielding hood 1 is
This is to prevent the image display from becoming difficult to see when used outdoors under strong direct light. Furthermore, the GH panel shown in FIG. 2 is used in conventional LC-TVs due to its good responsiveness. In Figure 2, 2 is a polarizing plate, 3 is a glass plate, 4 is a sealing material,
5 is a silicon substrate, and 6 is a guest host liquid crystal. The GH panel can be used with or without the polarizing plate 2. However, there are advantages and disadvantages depending on whether the polarizing plate 2 is present or not. Table 1 shows the comparison. Here, brightness is defined as brightness=luminance of the brightest area+luminance of the darkest area/2 (1), and the contrast will be described later.

〔the purpose〕

The present invention eliminates these drawbacks, and its purpose is to provide a bright and high-contrast image display on an LC-TV. In other words, it is an object of the present invention to provide a means for solving in a well-balanced manner both the poor contrast caused by the lack of a polarizing plate and the weak bright display caused by the presence of a polarizing plate. [Example] The present invention will be described in detail below based on Examples. FIG. 3 shows the casing structure of the LC-TV according to the present invention, and FIG. 4 shows the GH panel used in the present invention. In FIG. 3, 7 is a polarizing plate, 8 is a polarizing plate support, and 9 is a GH panel. As shown in FIG. 4, the GH panel 9 is a general one using a silicon substrate 5 without a polarizing plate. Further, the polarizing plate 7 and the polarizing plate support 8 constitute a polarizing hood. The polarizing hood is configured to also serve as a lid for the GH panel 9. When using a polarizing hood, place the LC so that the light source (such as sunlight) is on the opposite side of the GH panel 9 across the polarizing hood.
- Place the TV and position the polarizing hood and GH panel 9 so that the shadow of the polarizing plate 7 falls on the GH panel 9. The light from the light source passes through the polarization hood and is polarized in the direction in which the on-off ratio of the light of the GH liquid crystal 6 is highest. That is, the polarization direction may be parallel to the long axis direction of the oriented liquid crystal. At this time
The contrast of GH panel 9 is the best. As can be seen from the conventional example, the number of times the light passes through the polarizing plate is half that of a GH panel with a conventional polarizing plate, so the brightness is sufficient. By attaching the polarizing hood in this way, the contrast and brightness of the GH panel 9 can be improved compared to conventional GH panels that simply do not have polarizing plates or GH panels that simply have polarizing plates placed closely together. Recognize. As an application of this polarizing hood, there is a method of suppressing unnecessary reflection of light on the surface of the glass plate 3 of the GH panel 9. As is well known, light reflected from a surface such as a glass plate is polarized. Conversely, light polarized in a certain direction is extremely difficult to reflect on surfaces such as glass plates. That is, the polarization direction of the polarization hood is shown in FIG.
The direction should be parallel to the plane made up of the three points. By the above method, the light from the light source 10 is
The reflection from the surface of the GH panel 9 prevents the image from entering the eyes of the receiver, resulting in an extremely high quality image display. For example, if the luminance when the incident light is totally reflected is 1, and the transmission efficiency of the polarizing plate used is A,
If the darkest part polarized in the alignment direction of the liquid crystal is B, then
It will look like Table 2.

〔effect〕

As in the present configuration, the polarization direction is
If the direction is parallel to the long axis direction of the liquid crystal, the light absorption efficiency will be the best, and the contrast of the GH panel will be the best. Furthermore, with this configuration, only the incident light is polarized, and the reflected light is allowed to directly enter the eye, so it has the effect of providing sufficient lighting and providing a bright display. In addition, because this invention has a polarizing plate attached to the lid that can be opened and closed, the following conditions can be observed: a state without a polarizing plate, a state with a polarizing plate in close contact with the panel, and a state in which the light that has passed through the polarizing plate hits the panel and the directly reflected light is seen. You can choose. This means that the optimum state can be selected depending on the surrounding environment, and it can be used not only in the state which is the most characteristic of the present invention, but also in the state . I was able to make it happen.

[Brief explanation of the drawing]

Fig. 1 is a diagram of a conventional television, Fig. 2 is a cross-sectional view of a conventional guest-host liquid crystal image display panel, Fig. 3 is a diagram of a liquid crystal television in the present invention, Fig. 4 is a cross-sectional view of a guest-host liquid crystal image display panel used in the present invention, and Fig. 5 is an explanatory diagram of a liquid crystal television in which the present invention is applied. 1: light shielding hood, 2: polarizing plate, 3: glass plate, 4: sealing material, 5: silicon substrate, 6
. . guest-host liquid crystal, 7 . . polarizing plate, 8 . . polarizing plate support, 9 . . guest-host image display panel, 10 . . light source, 11 . . reflection point, 12 . . image receiver's eye.

Claims (1)

[Scope of utility model registration request] A guest host liquid crystal image panel is housed in a case, the case has a lid that can be opened and closed, and the lid is provided with a polarizing plate, and when the lid is opened, the polarizing plate passes through the polarizing plate. The polarizing plate is arranged such that the polarization direction of the incident light is parallel to the long axis direction of the oriented guest-host liquid crystal in the guest-host liquid crystal image display panel, and the reflected light from the guest-host liquid crystal image display panel is directed to a polarizing plate. A guest-host liquid crystal display device, characterized in that the case is not transparent and has no outside light shielding material other than the lid.