JPS6271930A - Display device - Google Patents

Abstract

PURPOSE:To control electrically the switching display of respective transmission and reflection modes by arranging a liquid crystal cell using dynamic scattering type liquid crystal on the lowest cell. CONSTITUTION:A liquid crystal 11 indicating an dynamic scattering effect is sealed between two substrates. When a voltage is applied between 10 and a transparent electrode 12, the array of liquid crystal molecules loses its regularity, and when the applied voltage is increased furthermore, the liquid crystal molecules become irregular turbulent state, incident light is scattered, the area 14 is acted as a background plate and the device becomes a reflection type. In an area 15 to which no voltage is applied, the array of the liquid crystal molecules is regulated in the orientating direction of an orientation film, so that the incident light is transmitted as it is. In this case, the device becomes a transmission type.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a display device with a multilayer cell structure, and in particular, to a display device having a multilayer cell structure,
The present invention relates to a display device that can switch between reflection display modes.

[Summary of the Disclosure] This specification and drawings describe a display device with a multilayer cell structure in which transmission and reflection modes can be switched by arranging a liquid crystal cell using a dynamic scattering liquid crystal in at least the bottom cell. This invention discloses a technology for electrically controlling display.

[Prior Art] As an example of a conventional display device of this type, FIG. 2 shows a perspective view of a reflective liquid crystal display device. In FIG. 2, what is on the surface of the glass substrate 2? Day formed by segments
A transparent electrode 3 having a letter-shaped pattern is formed, and a transparent electrode 5 which is uniform over the entire surface is formed on the surface of the opposing glass substrate 6. An alignment film (not shown) for aligning the liquid crystal is formed on the electrode of each substrate and subjected to a predetermined alignment treatment. Further, a liquid crystal 4 is sealed between two opposing substrates. 1 and 7 are deflection plates, and the upper and lower deflection axes are arranged to be perpendicular to each other in a plane. 8 is a reflective plate such as an aluminum plate.

In the jade structure, for example, when a voltage is applied to a predetermined electrode, the orientation of the liquid crystal between the electrodes changes, and the incident light is transmitted with a 90° twist. That is, the transmission or non-transmission of incident light is controlled depending on the presence or absence of voltage, and two images, ``bright'' and ``dark,'' are displayed on the surface.

[Problems to be Solved by the Invention] In such a display device, the reflective plate 8 is attached to the back surface of the polarizing plate 7 with an adhesive or the like and is integrated, so when used as a transmissive display device, had the disadvantage that it required the use of a liquid crystal cell without a separate reflector.

An object of the present invention is to provide a display device capable of controlling transmission/reflection switching.

[Means for Solving the Problems] The technical means of the present invention will be explained using FIG. 1 corresponding to an embodiment. FIG. 1 is a diagram showing an example of a transmissive/reflective switching liquid crystal cell used in the present invention. In FIG. 1, a transparent electrode 10 divided into two regions 14 and 15 is formed on the surface of a glass substrate 9, and a transparent electrode 12, which is uniform throughout, is formed on the surface of a glass substrate 13. There is an alignment film (not shown) on the electrode surface of each substrate to align the liquid crystal.
is formed and subjected to a predetermined orientation treatment. Further, a liquid crystal 11 exhibiting a dynamic scattering effect is sealed between these two substrates. The display device according to the present invention has this liquid crystal cell stacked with other transmissive display cells to form a multilayer cell.

[Function 1] In the above configuration, when a voltage is applied between the electrode corresponding to the region 14 of the transparent electrode IO and the transparent electrode 12, the arrangement of liquid crystal molecules loses its regularity, and the applied voltage is further increased. Then, the liquid crystal molecules become irregular and turbulent, and the incident light is scattered. That is, the area 14 acts as a background plate,
The device will be reflective.

On the other hand, in the region 15 to which no voltage is applied, the arrangement of liquid crystal molecules is regulated in the alignment direction of the alignment film, so that the incident light is transmitted as is. In this case, the device is of a transmission type.

Embodiment 1 FIG. 3 is a perspective view of a display device showing an embodiment of the present invention. This display device consists of a normal transmissive liquid crystal cell and the liquid crystal cell shown in Figure 1, which are laminated and bonded together in two stages, and each reference numeral in the figure corresponds to each of Figures 1 and 2. do,
Ru. In FIG. 3, when a voltage is applied between the portion of the transparent electrode 8 corresponding to the region 14 and the transparent electrode 12, the two 7-segment display patterns on the right side are displayed by reflective cells, and the two 7-segment display patterns on the left side are displayed by reflective cells. The two 7-segment display patterns will be displayed by transparent cells.

That is, it is possible to simultaneously configure different display formats such as a transmissive type and a reflective type in one cell. In this case, if a voltage is also applied to the portion corresponding to region 15, the cell becomes a fully reflective cell, and if no voltage is applied to any part, the cell becomes a fully transmissive cell.

Furthermore, in the liquid crystal cell shown in FIG. 3, the background color can be made colored by mixing a dichroic dye into the liquid crystal.

Furthermore, by changing the structure of the cell from two to three layers, it becomes possible to selectively perform display switching between transmission and reflection for a plurality of display cells.

In the above embodiments, a case has been described in which a liquid crystal cell is used as a cell having a segment display pattern, but an electroluminescent (EL) element or the like may be used as the display cell to be stacked. Further, the area shown in FIG. 3 may be further divided into a plurality of patterns depending on one display mode, or may be made uniform over the entire surface.

[Effect] As explained above, in the present invention, a plurality of ordinary transmissive display cells and liquid crystal cells having a dynamic scattering effect are stacked to form an integrated structure, and the transmission/reflection mode can be switched by the liquid crystal cell section. As a result, it is possible to electrically control switching display between transmission and reflection display modes even though it is a single display device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a transmissive/reflective switching liquid crystal cell, FIG. 2 is a perspective view of a conventional display device, and FIG. 3 is a perspective view of a display device according to the present invention. 2.8,9.13...Glass substrate, 3,5,10.1
2...Transparent electrode. 4.11...Liquid crystal.

Claims (1)

[Claims] (1) A display device formed by stacking a plurality of transmissive cells to form a multilayer cell, characterized in that a liquid crystal cell using dynamic scattering liquid crystal is disposed in at least the lowest cell.