JPS58139174A - Matrix type liquid crystal panel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to an IJ type liquid crystal display panel that is equipped with a thermotropic liquid crystal and has a memory function.

[Prior art and its problems]

As shown in FIG. 1 (II), Φ)K, a conventional matrix type liquid crystal display panel using a thermotropic liquid crystal has two transparent substrates 2 facing each other with a spacer l interposed therebetween to generate heat. The heater electrodes 4, which are made up of a plurality of pieces, and the signal electrodes 4, which are made up of a plurality of rounded pieces that apply display signals, are arranged so as to be perpendicular to each other, and the thermotropic liquid crystal 5 has a structure that is durable. Each intersection between the electrode 3 and the signal electrode 4 becomes a display pixel.

The thermotropic liquid crystal 5 used for this has a positive (p-type) dielectric anisotropy of the liquid crystal molecules, and changes into a smectic state, a nematic state, and a liquid state depending on the temperature, and may be in a smectic state. @f (hereinafter referred to as T8N) that changes to the nematic state is, for example, s3℃
The temperature at which the nematic state changes from the nematic state to the liquid state (
The temperature (hereinafter referred to as TNI) is adjusted to be around 56° C. to prevent the liquid crystal state from changing due to the operating environment temperature fK.

2nd ii! The operation basics of a nine-matrix type liquid crystal display panel using the above liquid crystal! This will be explained using ll and i. In the initial state at room temperature, the liquid crystal 5 in the matrix type liquid crystal display panel is in a smectic state as shown in FIG. The layers face in a certain direction and are parallel to each other, but each layer faces in a different direction and scatters light, so it appears cloudy. Display to perform display operation from this state −
A voltage is applied to the heater electrode 3 corresponding to the temperature T.
The liquid crystal is heated with a tube having a temperature of NI or higher to turn it into a liquid state that no longer exhibits the properties of liquid crystal, and when it becomes this liquid crystal state 11, the application of voltage to the heater 111E & 3 is stopped at the 9th point, and at the same time, the display pixel is made to perform a display operation. Signal electric switch 4 corresponding to
Apply a signal voltage to. The liquid crystal is cooled from the moment when the voltage application to the heater electrode 3 is stopped, and the liquid crystal is
When the signal voltage is applied, the long axis of the liquid crystal molecules becomes nematic foreshadowing, and the long axis of the liquid crystal molecules is aligned in one direction. The direction is perpendicular to the transparent substrate, and in the display pixel portion to which the signal voltage is not applied, the liquid crystal molecules are oriented in an appropriate direction as shown in FIG. 2(C). Further, when the temperature falls below the temperature T8N, the liquid crystal enters a smectic state, and the arrangement of liquid crystal molecules at this time is related to the arrangement of liquid crystal molecules in a nematic state. In other words, when a signal voltage is applied during the nematic state, the long axes of the liquid crystal molecules are perpendicular to the transparent substrate. They overlap in the same direction as the long axis and become transparent, and the other parts appear cloudy as shown in Figure 112(a), similar to the initial state. In addition, in the smectic state, the viscosity of the liquid crystal becomes high and it no longer responds to the signal voltage, and it has a memory effect that maintains a cloudy or transparent state, and the heater electrode 3 and signal voltage @4 are connected to each other except when updating the display contents. No voltage needs to be applied.

The problem with the operation of a matrix type liquid crystal display panel having such a configuration is that it takes a long time to update the display contents using means of heating and cooling when performing a writing operation, and that it takes a long time to update the displayed contents. The point is that a signal must be applied anew to display pixels other than the display pixels in which the display contents need to be updated.

[Purpose of the invention]

It is an object of the present invention to improve the above-mentioned problems, and particularly to make it possible to update display contents on a display-element basis.

[Summary of the invention]

The ff)' J-shaped liquid crystal display panel according to the present invention consists of two transparent substrates facing each other with a spacer interposed therebetween, two sets of heating electrodes each consisting of several exposed heater electrodes arranged perpendicularly to each other, and facing oppositely to each other. A thermotropic liquid crystal is provided between two sets of signal electrodes and a weighing signal electrode, which are arranged such that each intersection of the two sets of heater electrodes becomes a display pixel.

【Effect of the invention〕

Since the matrix type liquid crystal display panel according to the present invention has the two sets of heater electrodes, by selecting one electrode from each of the two sets of heater electrodes and applying a voltage, the intersection point between the two electrodes can be detected. It became possible to set the temperature to TNI, and to set the other selected heater electrodes to the temperature TaN or lower.

As a result, when it becomes necessary to update the display content for each display pixel, there is no need to apply a signal voltage for a portion of the entire display on the selected heater electrode as in the past. It is sufficient to apply only the signal voltage of the display pixel to be displayed.

Nine display pixel unit Kl! Since the displayed contents can be updated, it is also possible to drive using a point-by-point scanning method.

[Embodiments of the invention]

An embodiment of the matrix type liquid crystal display panel of the present invention will be described below with reference to the drawings.

FIGS. 3(1) and 3(b) show a 01-pole structure on a transparent substrate of a matrix type liquid crystal display panel according to the present invention. On one of the transparent substrates 10, first heater electrodes 11 of a constant width are arranged at equal intervals in the vertical direction, and second heater electrodes 13 are arranged on the first heater electrodes 11 with an insulating film 12 interposed therebetween. The first heater electrode 11 is arranged perpendicularly to the first heater electrode 11 . Further, a first signal electrode 15 is provided with an insulating film 14 interposed therebetween. On the other transparent substrate 16, a second signal electrode 17 having the same width and the same spacing as the first heater electrode 11 is provided at a position r11 opposite to the first heater electrode 11. As shown in FIGS. 4(b) and 4(b)K, the two sets of transparent substrates 10.
16 are faced to each other, their peripheries are sealed with a sealing material 18, and a thermotropic liquid crystal 19 is sealed. Note that (a) in the same figure shows a plan view, and (a) shows a side view.

Next, an example of the manufacturing method of the 'electrode in the above example is 1s.
This will be explained using Figure 5. A glass substrate is used as the transparent substrate 10, and as shown in FIG.
Further, after applying the photoresist 22, an exposure phenomenon is performed to remove the photoresist 22 other than the portion that will become the first heater electrode, and the exposed nickel-chromium alloy 21 is removed by etching, resulting in the result shown in FIG. 5). After removing the remaining photoresist 22, an insulating layer 0223 is attached, and a nickel-chromium alloy 24 for the second heater electrode is attached thereon, resulting in the result as shown in FIG. 45(d). After that, a second heater electrode is formed by the same method as the first heater hidden electrode, and then, as shown in FIG. In for communication electrode
20126 is deposited over a distance that includes all the intersections of the four poles of the 41 heater and the second heater electrode. The electrode on the other transparent substrate 16 can also be formed by using a glass substrate as the transparent substrate, depositing In2O3 for the second signal electrode thereon, and etching away the In20B other than the portion that will become the electrode.

The matrix type liquid crystal display panel according to the above embodiment has a first heater electrode 11 and a second heater electrode 13, and each - electrode is selected and the first signal electrode @15 is connected to the selected first heater electrode 11. By selecting the second signal electrode 17 corresponding to the intersection with the iris 2 heater electrode 13 and applying % pressure to each, it is possible to perform display in units of display pixels. Previously, display could only be done using the point-by-point scanning method, but now it is now possible to display using the point-by-point scanning method. Of course, the signal electrode 17 is perpendicular to the heater electrode 13 as in the conventional case.
1iIl sequential scanning method is also possible. Furthermore, after the display operation using the dot sequential or ttm* next scanning method is completed, only the display contents of an arbitrary display i&search can be updated.

[Other examples of Komei]

Another embodiment of the present invention will be described with reference to FIGS. 6 and 7. Since FIGS. 6(a) and 6(b) show the electrode structure on a transparent substrate, the first heater electrode 31 and the second heater electrode 32 are arranged separately on two plates. It is something. One of the transparent substrates 33 is a glass substrate, on which the first heater electrode 31 is provided, and the first signal electrode 36 is provided with an insulating film 35 interposed therebetween.
4, a glass substrate is used, and a second heater electrode 32 is provided so as to be perpendicular to the first heater electrode 31, and a second signal electrode 38 is provided with an insulating film 37 interposed therebetween. These two sets of transparent substrates 33
．． 34 are opposed to each other, and the sealing material 39 is placed in the same manner as in the previous embodiment.
When the thermotropic liquid crystal 40 is sealed and the seventh
It becomes as shown in Figure (1), Φ). The same figure (all) is a plan view, and (b) is a side view.

The effects of this embodiment are similar to those of the previous embodiment.

[Brief explanation of drawings]

Fig. 1 is a structural diagram of a nine-matrix type liquid crystal display panel using a conventional thermotropic abic liquid crystal, Fig. 2 is a diagram showing the arrangement of thermotropic liquid crystal molecules depending on temperature, and an embodiment of the present invention FIG. 4 is a structural diagram of a matrix type liquid crystal display panel according to an embodiment of the present invention, FIG. 5 is a diagram showing one step in the manufacture of electrodes, and FIGS. FIG. 7 is a structural diagram of an electrode and a matrix type liquid crystal display panel according to another embodiment. 10.16, 33.34...transparent substrate, 11.13,
31.32... Heater electrode, 15.17, 36.38
...Transparent signal electrode, 19.40...Thermotropic liquid crystal. Agent: Patent Attorney Noriyuki Chika (and 1 other person) 1st Sono? Figure 2 Figure 4 ta) (&) Figure 5 Figure 6 Figure 1 (Figure 7

Claims (1)

[Claims] 92 transparent substrates facing each other with a gap in parallel, and 9 two thin heater electrodes arranged on the inner surfaces of these substrates to be electrically insulated from each other and orthogonal to each other,
# electrically with these heater electrodes! ! A matrix-type liquid crystal comprising knee transparent signal electrodes arranged so as to face each other, and a thermotropic liquid crystal interposed between these transparent signal electrodes and the heater electrode. display panel.