JPH0584525B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a touch entry panel of a liquid crystal display device that can be used as an input device for a computer or the like.

Prior Art Conventionally, a touch entry panel for this type of liquid crystal display device has been used in which input is performed through contact between conductive plates.
In this configuration, since the contact area is relatively large, precise input cannot be performed when performing X-Y matrix input, and there are also drawbacks such as increased contact resistance at the contact portion and poor contact. Since the input is performed by mechanical operation, there was a problem in terms of durability.

Purpose In view of the above points, the present invention enables reliable and precise touch input by making it contactless, and displays the input contents as they are on the input area using a liquid crystal display. The present invention aims to provide a touch entry panel for a liquid crystal display device with good durability.

Overview This purpose is to use transparent conductive films, which are arranged in parallel and have a conductive film with an electrode pattern such as an or an opaque plastic or glass substrate and a surfactant (monobasic carboxylic acid polynuclear chromium complex, organic silane compound,
This solution is solved by the Tatsuchi entry panel, which is characterized by being composed of a liquid crystal mixed with acicular magnetic substances (various methyl, various ferrite) treated with dimethyl octadecylaminopropyl trimethoxyl chloride, etc. .

In this touch entry panel, input is performed at a predetermined position by bringing a probe, preferably made of a permanent magnet, close to a predetermined position on the substrate.

More preferably, the probe is a glove with permanent magnets in one or more fingertips.

Embodiment The present invention will be described below based on an embodiment shown in the drawings. In FIG. 3 is a conductive film having an electrode pattern such as an X-Y matrix provided on the inner surface facing each other of the substrate 2, and 4 is a conductive film processed from above the conductive film 3 on the inner surface to control the orientation. alignment treatment agent for, 5
is a liquid crystal sealed between the substrates 2 and mixed with acicular magnetic material whose surface is treated with a surfactant; for example, it is a nematic liquid crystal mixed with acicular particles of Fe ₂ O ₃ . . In this case, the alignment agent is a wet alignment agent that chemically adsorbs onto the substrate surface and has excellent reliability and durability, such as an alignment agent such as a chromium carboxylate complex or an organic silane compound. be.

Since the embodiment of the present invention is constructed as described above, for example, as shown in FIG.
When the permanent magnet 6a is brought close to a desired position on the surface of the touch entry panel 1 as shown by the arrow A as shown in FIG. Due to the action of the permanent magnet 6a of the probe 6, the liquid crystal molecules of the liquid crystal 5 and the needle-like magnetic material change their alignment, and thus the capacitance between the conductive films 2 increases by 20 to 30% or more in this region. When this increase in capacitance is detected, a specific signal is output from the output terminals 10a and 10b in response to a command or code instruction, and this signal is processed by an electronic circuit (not shown), and the dot matrix display section displays as instructed. It is done. That is, the conductive film 3
is a transparent body whose inner surface is coated with a transparent electrode and coated with an alignment agent so that the liquid crystal molecules 9 are aligned perpendicularly to each other. Light can be transmitted between the substrates when no electric field is applied, but cannot be transmitted when a voltage is applied, and these relationships are similar to those of conventional liquid crystal display devices.

As shown in Figure 5, the magnetic particles δ (length approximately 0.5 μm) are liquid crystal molecules 9 that are twisted and oriented in the absence of an electric field.
(length approximately 50 Å) and are aligned approximately perpendicularly to the planes of the electrodes 7 and 7', but when the voltage shown in FIG. 6 is applied, the vertically aligned liquid crystal molecules 9 align them almost parallel do. When the probe 6 is brought close to the touch entry panel 1 while this voltage is applied, a part of the magnetic particles 9 becomes vertical due to the magnetic force, and the capacitance of that part between the electrodes 7 and 7' changes. It can be an input information signal. As a result,
When the conductive film 2 of the touch entry panel 1 has an X-Y matrix electrode pattern,
A desired X-Y position according to the X-Y matrix can be detected, and this touch entry panel 1 can be connected to the CPU 11 and the CRT as shown in FIG.
If the touch entry panel 1 is connected to a computer 10 or the like consisting of a computer 10, the display can be displayed at a position on the display surface of the CRT 12 corresponding to the desired X-Y position of the touch entry panel 1. The input figures can be displayed on the display screen of the CRT 12, and the CPU 11 of the computer 10 recognizes the characters etc. input by hand on the touch entry panel 1 with the probe 6 and stores the characters etc. in a dot pattern in advance. in the shape of
It can also be displayed on the display screen of the CRT 12.
Furthermore, if the touch entry panel is made of a transparent material, it can be arranged on the display surface of the CRT 12 so that touch input can be performed while looking at the display surface. Further, as a probe, as shown in FIG. 4, it is also possible to use a glove-shaped probe 16 having one or more (all in the case of FIG. 4) fingertips equipped with permanent magnets 16a; in this case, There is no need to hold the probe in your hand when you want to use it, making input operations easier.

Effects of the Invention As described above, according to the present invention, two conductive films are arranged in parallel and have an electrode pattern such as an X-Y matrix on their mutually opposing inner surfaces, and furthermore, A transparent or opaque plastic or glass substrate whose inner surface has been subjected to alignment treatment, and a liquid crystal sealed between the substrates and mixed with a needle-shaped magnetic substance treated with a surfactant. Since the entry panel is constructed, each touch input section is formed by an electrode pattern of a conductive film, so it can be constructed relatively small, and therefore, precise input can be performed especially in the X-Y matrix. Furthermore, since the input operation is performed by using a permanent magnet to change the capacitance between the conductive films that sandwich the liquid crystal, the input section is made contactless, resulting in problems such as increased contact resistance and poor contact. is completely eliminated and is highly desirable in terms of durability and extremely effective.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of an embodiment of the touch entry panel according to the present invention, FIG. 2 is a side view showing an example of a probe used for inputting data to the touch entry panel of FIG. 1, and FIG. X-Y by invention
A schematic diagram showing an example of the use of a matrix type touch entry panel, Fig. 4 is a side view showing another example of the probe, Fig. 5 is a sectional view of the touch entry panel showing a state in which the probe is brought closer, Fig. 6 7 is a cross-sectional view of the touch entry panel showing a voltage applied state, and FIG. 7 is a cross-sectional view illustrating the operation of the touch entry panel of the present invention. 1... Touch entry panel, 2... Board, 3
... Conductive film, 4 ... Alignment treatment agent, 5 ... Liquid crystal,
6, 16...Probe, 6a, 16a...Permanent magnet, 10...Computer, 11...CPU, 1
2...CRT.

Claims (1)

[Claims] 1. Two conductive films arranged in parallel and having an electrode pattern such as an X-Y matrix on their mutually opposing inner surfaces, and furthermore, the inner surfaces are subjected to an orientation treatment. It is characterized by being composed of a transparent or opaque plastic or glass substrate and a liquid crystal sealed between the substrates and mixed with a needle-shaped magnetic substance treated with a surfactant. Touch entry panel of liquid crystal display device. 2. The touch entry panel of a liquid crystal display device according to claim 1, wherein input is performed at a predetermined position by bringing a probe made of a permanent magnet close to a predetermined position on the substrate. 3. The touch entry panel for a liquid crystal display device according to claim 2, wherein the probe is a glove having a permanent magnet at one or more fingertips.