JPH04138423A - Liquid crystal display panel and liquid crystal display method - Google Patents

Abstract

PURPOSE:To enable only the user of the liquid crystal panel to view display contents by providing a polarizing plate on a front side freely attachably and detachably to and from the panel body so that the polarizing plate covers the entire surface or a part of the surface of the liquid crystal cell. CONSTITUTION:The polarizing plate 7 is formed freely attachable and detachable and is positioned between the liquid crystal display panel A and the user 11. The polarizing plate 8 on the rear side faces a panel light source 9 while the front side polarizing plate 7 detached from the front side of cell glass 4 enclosing a liquid crystal 1 exists in front of the user 11 who views the display screen. The incident polarized light on the inside of the liquid crystal 1 changes as the plane of the polarization thereof mates the light distribution direction of the liquid crystal unless a voltage is impressed between transparent electrodes 2 and 3. The polarized light, thereupon, transmits only the panel part impressed with the voltage and does not transmit the other parts if the polarization directions of the light shielding plates 7 and 8 are held the same. Only the user is able to recognize the display images in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to improvements in liquid crystal display panels used in electrical appliances such as calculators, word processors, personal computers, and televisions, and methods of using the same.

(Prior Art) As shown in FIG. 6(a), a generally known liquid crystal display panel has a cell glass 4.5 in which liquid crystal 1 is oriented at a predetermined angle and transparent electrodes 2.3 are provided on the inner surface. It consists of a liquid crystal cell 6 sandwiched between them, a polarizing plate 7.8 provided integrally on both the front and back surfaces according to the orientation angle of the liquid crystal, and a planar light source 9 provided on the back surface, or (b). As shown, a reflector plate]0 is provided on the back surface of the liquid crystal display cell shown in (a) in order to use incident light from the front side as a light source.

(Problem to be Solved by the Invention) However, such a liquid crystal display panel is difficult to use when you do not want outsiders to see the contents of the display screen, for example, when you are creating data during business negotiations or confidential documents. The problem is that all the displayed contents can be seen by outsiders, and furthermore, it is difficult to limit the display to five screens because the display screen is produced only by the liquid crystal drive unit.

In view of the above-mentioned problems, does the present invention allow only the user of the liquid crystal display panel to view the displayed content?

Or, we would like to provide a liquid crystal display panel that can adjust the presentation means so that only a part of the display screen is displayed, or so that some people can see the entire display screen and others can only see a part of it, and how to use the same. It is something to do.

(Means for Solving the Problem) The above problem is to provide a liquid crystal display panel having a liquid crystal cell and a polarizing plate, in which the front polarizing plate is detachably attached to the panel body, and the polarizing plate or a separate polarizing plate is provided. A liquid crystal display panel that covers the entire surface or a part of a liquid crystal cell, a liquid crystal display method thereof, a liquid crystal cell, a polarizing plate and a reflecting plate sequentially attached to one side of the liquid crystal cell, and a polarized light source that illuminates the other side. The problem is solved by the invention of a liquid crystal display panel and a liquid crystal display method thereof, which are characterized by comprising the following.

This will be explained below.1 In the present invention, the polarizing plate on the front side can be separated from the panel main body, and it is normally used with the polarizing plate attached, but when it is desired to distinguish between the display contents shown to the user and outsiders. The front polarizing plate is removed and the polarizing plate is placed only between the front side of the LCD panel and the panel user, and the displayed image is completely invisible to outsiders who are in the direction away from the polarizing plate. So do it.

Therefore, the polarizing plate on the front side can be easily attached to and removed from the display panel body.1 When it becomes necessary to prevent outsiders from seeing the displayed image, the polarizing plate can be removed from the main body and placed only in front of the user. let

As a method for removably attaching the polarizing plate to the display panel, any conventional means such as a hinge, an insertion/removal frame with a guide, a magnet, an adhesive tape, an adhesive tape, etc. can be used.

Instead of using the polarizing plate that has been removed from the display panel as it is, if polarized glasses in which the polarizing plate is shaped like glasses are used, only the user can easily and conveniently recognize the displayed content.

In this case, the liquid crystal display panel may be of any type, such as a transmissive type or a reflective type.

In addition, if polarized light is irradiated from a polarized light source onto the liquid crystal cell from the front side with the polarizing plate removed, the displayed image can be recognized only when irradiated, and if only a part of the liquid crystal cell is irradiated with polarized light, only that part is recognized, and the displayed image can be displayed while freely controlling both temporally and partially.

Furthermore, by changing the polarization direction of the polarizing plate, positive images and negative images can be easily obtained.

The driving method of the liquid crystal display panel of the present invention is simple matrix, active matrix, type of liquid crystal, 'I'N, S'rN in terms of orientation angle, ferroelectric liquid crystal, color mode, monochrome mode, yellow mode in terms of color tone. Any of various liquid crystal display panels may be used.

Examples of the types of polarizing plates include those made from processed natural porphyrite, tourmaline, etc., those made from herbatite, and those made by dipping iodine into a -axially stretched polyvinyl alcohol film. Reflected light from water, glass, etc. may be used as a polarized light source.

The present invention will be explained below with reference to Examples.

(Example) Example 1 The transmissive liquid crystal display panel shown in FIG.
is detached from the front side of the cell glass 4 surrounding the liquid crystal 1 and is located in front of the user 11 viewing the display screen,
The polarizing plate 8 on the back side faces the planar light source 9. The plane of polarization of the polarized light incident on the liquid crystal 1 changes according to the alignment direction of the liquid crystal unless a voltage is applied between the transparent electrodes 2 and 3, but does not change when a voltage is applied. Therefore, if the polarization directions of the polarizing plates 7 and 8 are set in the same direction, the polarized light is transmitted only to the part of the panel to which the voltage is applied, and the other parts are not transmitted, so that only the user can recognize the displayed image.

Therefore, as shown in FIG. 6, when the polarizing plate 7 is attached, the displayed contents can be recognized by anyone.

When the polarizing plate 7 is removed as shown in FIG.
Only people looking through it could see the display screen; to other outsiders, the panel only appeared to glow.

Embodiment 2 In the reflective liquid crystal display panel B shown in FIG. 2, the polarizing plate 7 is separated from the front side of the cell glass 4 surrounding the liquid crystal 1 and is positioned in front of the user 11 viewing the display screen. A reflecting plate 10 is provided on the polarizing plate 8 on the back side to reflect light to the front side. In this case as well, anyone could recognize the displayed content when the polarizing plate 7 was attached, but in the detached state as shown in the figure, only the user 11 looking through the polarizing plate 7 could recognize the content, and outsiders could turn off the power. It looked the same as if it had been cut.

Embodiment 3 In the reflective liquid crystal display panel C shown in FIG. 3, when the polarizing plate 7 on the front side is removed and polarized light is emitted from the polarized light source 12, only the irradiated area 13 is displayed, and the rest is displayed even if a voltage is applied to the transparent electrode. The displayed image cannot be recognized even if it is displayed. However, when the user 11 wore the polarized glasses 14, he was able to recognize all displayed images.

Embodiment 4 In the liquid crystal display type calculator shown in FIG. 4, a polarizing plate 7 is attached to the calculator by a hinge 15 and is provided so as to cover a screen display section 16. In this case, the user 11 views the screen display section 16 through the polarizing plate 7 and can therefore recognize the displayed content, but the outsider 17 cannot.

Embodiment 5 As shown in FIG. 5, when the liquid crystal display panel of the present application is used in a liquid crystal television E, a polarizing plate 7 is attached to the front side of the television body using a fixing frame 18, and when it reaches the end of life, it is attached to the back side. Fit it into the storage part 19. If a polarizing plate is placed between the user and the panel or if the user wears polarized glasses, only the user can recognize the displayed content; outsiders cannot recognize it at all.

Furthermore, by wearing polarized glasses (not shown) with a polarizing plate that could be rotated by a knob, the participants were able to freely select and view positive and negative images by rotating the polarizing plate 90 degrees.

(Effect of the invention) As described above, by making the polarizing plate removable and positioning it between the liquid crystal display panel and the user, it is possible to operate the panel without letting outsiders know the displayed content. In addition, if you irradiate polarized light from the front side of a reflective type LCD panel or the back side of a transmissive type LCD panel with the polarizing plate removed or not, you can easily illuminate only the desired area of the panel. Furthermore, when using a reflective liquid crystal panel, it is easy to create a display in which only a portion of the screen is visible to people other than those viewing the panel through a polarizing plate, and the polarizing plate can be rotated by 9Q degrees. It is also possible to select and view positive images and negative images, making the present invention extremely useful industrially.

[Brief explanation of drawings]

Figures 1 and 2 are longitudinal sectional views of a transmissive type and a reflective type liquid crystal display panel of the present invention, Figure 3 is a perspective view showing another embodiment of a liquid crystal display panel of the present invention, and Figure 4 is a liquid crystal display type. Figure 6 is a side view showing an example of a calculator, Figure 6 is a perspective view showing an example of a liquid crystal display television, Figure 6 (a) is a conventional transmissive liquid crystal display panel, and Figure 6 (b) is a reflective liquid crystal display panel. FIG. 1. 2, 3゜4, 5゜6, . 9, +. 11. 13. 15. 16. 18. LCD 1 0. Transparent electrode 1 0. Cell glass, liquid crystal cell, 7.8° planar light source, 10. . , user, 12. . , irradiated part, 14°, hinge 1, screen display part, 17. ,,outsider 1, fixed frame,
19. ,, storage section. , polarizing plate, reflector, polarized light source 1, polarized glasses,

Claims (1)

[Claims] 1. In a liquid crystal display panel having a liquid crystal cell and a polarizing plate, a front polarizing plate is provided to be detachably attached to the panel body, and the polarizing plate or a separate polarizing plate covers the entire surface of the liquid crystal cell or A liquid crystal display panel characterized by partially covering the panel. 2. One polarizing plate of a liquid crystal display panel having a liquid crystal cell and a polarizing plate is detachably attached to the panel body, so that only the user can recognize the displayed image through the detached polarizing plate or a separate polarizing plate. Characteristic LCD display method. 3. A liquid crystal display panel comprising a liquid crystal cell, a polarizing plate and a reflecting plate sequentially attached to one side of the cell, and a polarized light source that illuminates the other side. 4. A liquid crystal display method, characterized in that a polarizing plate and a reflecting plate are sequentially provided on one side of a liquid crystal cell, and the other side is irradiated with polarized light from a polarized light source in a temporally or partially controlled manner.