JPS58200384A - coordinate reading device - 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 The present invention relates to a two-dimensional coordinate input device that can read the coordinates of an input board simply by pressing it with a stylus pen.

Converting handwritten coordinates into electrical signals and inputting them into a calculator 2
The field of use of dimensional coordinate input devices is expanding from the industrial field to the consumer field as a peripheral device in 0muD, an input device in pattern recognition, and a character designation input device for word processors. Furthermore, in the future, it is expected that it will be developed not only as an input device for man-machine systems, but also as a character and graphic input device for social systems.

Conventionally, in the case of an electromagnetic induction type two-dimensional coordinate system that detects a position by generating electromagnetism from the tip of a stylus pen, the following method has been used to confirm the input figure.

(1) If the stylus pen has a writing instrument function such as a ballpoint pen, place a piece of paper 11 on the input board 1 and draw a trajectory with the stylus pen 2 as shown in Figure 1.
If your computer does not have a cursor function, or if it does have one and you want to check the input, you can check by displaying the trajectory of the stylus pen 20' on the TV screen.

However, this method has drawbacks such as requiring an external display device such as a television to confirm the input, and the need for auxiliary writing instruments such as paper), and as social systems develop in the future. It lacks the portability, convenience, etc. required for character and graphic input devices.

The present invention has been made to eliminate the above-mentioned drawbacks.
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The object of the present invention is to provide a two-dimensional coordinate input device which allows characters and figures being input to be input while being displayed on a display device on the same surface, and which is easy to confirm and excellent in simplicity.

The present invention will be explained in detail below with reference to embodiments shown in the drawings.

In FIG. 2, 4 is a stylus pen, and an electromagnetic field is generated from the tip 5 of p1. 6 is a transparent glass, 9 is an X-coordinate detection electrode, and 8 is a Y-coordinate detection electrode. Further, 7 is a transparent glass plate which serves both as insulation and support for the X and Y coordinate detection electrodes. When the tip 5 of the stylus pen 4 is brought into contact with the transparent glass plate 6 and electromagnetism is generated from the tip 5, the X and Y coordinate detection electrodes will have a certain number of rotations according to Fleming's law! A flow occurs.

This current signal is processed by the X coordinate detection circuit 19 and the X coordinate detection circuit 18 shown in FIG. Further explaining with reference to FIG. 3, the X-coordinate detection electrode 17 and the Y-coordinate detection electrode 16 are sufficiently thin so that the liquid crystal display element 15 obtains sufficient reflection contrast for light, and 16', 1
7', each constitutes a scanning line loop. Glass is used for the support plate 6.7 of the electrode with a seat-to-electrode ratio in order to make the liquid crystal display element below clearly visible.Thin electrodes of 1μ or less are formed using thin film forming techniques such as vaporization and sputtering. .

Chromium, which has good adhesion to glass, is used as this metal. Furthermore, since it is a thin metal film, the electromagnetic wave sensing ability is sufficient.

Now, returning to FIG. 2 and continuing the explanation, the processed coordinate position data is transferred to the electrode 12 on the liquid crystal upper glass 10 side and the electrodes 13, 13 on the liquid crystal lower glass 11 side by the liquid crystal drive circuit.
Then, a voltage is applied to the liquid crystal 12, and the liquid crystal display elements 15 in the locus of movement of the stylus pen are sequentially turned on. 13' is a common electrode □ on the lower glass side of the liquid crystal, and in the case of a liquid crystal display device for displaying figures, the number of elements is several hundred or more, which means that the force is not so high as to be more than triple IJ Lux movement.

The present invention will be explained in detail with reference to FIG. When the stylus pen 5 begins to draw the character 5 on the coordinate reading display device from that point in the direction of the arrow, (6) the character 5 is displayed in dots one after another as shown in the figure.

FIG. 5 shows another embodiment. Additionally, there is a coordinate reading/displaying device, and when a character is drawn within the dashed line 31 with the stylus pen 5-32, the character is reduced above the device and is output as a dot-constituting character. Naturally, by switching the mode, it is also possible to directly input figures. Even if the X and Y coordinate detection electrodes are metal electrodes, if they are in the middle of 0.1 can, they will not be noticeable at all during liquid crystal display, but if they are made of transparent electrodes made of metal oxide such as indium nesa film, they will not be noticed at all. I do not mind. However, since the resistance of the electrode itself increases, it is necessary to devise a circuit.

As described above, the present invention has a structure in which narrow electrodes for coordinate detection are formed on a transparent glass substrate and integrated with the liquid crystal display device, so that the characters or figures being input are Displayed on the same plane in real time, it is easy to check (No external display device such as a TV or auxiliary writing tools such as paper or ballpoint pens are required, making it easy to use. facility(
It is useful as a character input device for social systems such as city halls, shops, and medical institutions.

6-(3) Since the reading device and the display device are stacked, the device becomes compact and a portable input device can be easily realized. For example, a wide range of applications is expected, such as portable electronic memos, small portable input terminals for computers (using telephone lines, etc.).

There are various remarkable effects such as.

[Brief explanation of drawings]

Fig. 1 is an external view of a conventional coordinate reading device, Fig. 2.3 is a sectional view and a plan view of a coordinate reading device according to the present invention, and Fig. 4 (b) e (6) Fig. 5 is FIG. 7 is an explanatory diagram showing another embodiment according to the present invention. 1, 24, 30, , coordinate reading device 2.4,
25, 32°, stylus pen 8.16. ,,． Unidirectional coordinate detection electrode 9.17. , , Y-direction coordinate detection electrode 6.7. ,. , transparent glass plates 10, 11, , , liquid crystal display glass °12
, 13', 13, , liquid crystal display element/pole 15
,. . 06. Liquid crystal display device Applicant: Seiko Paiha Kogyo Co., Ltd. Agent Patent attorney Mogami

Claims (1)

[Scope of Claims] α) A transparent plate, electrodes for detecting coordinates in the Y direction located along the lower surface of the transparent plate and insulated from each other by a transparent member, and a display located further below. Equipment and equipment,
A coordinate reading device characterized by being capable of detecting and reading the locus coordinates of a stylus pen with the coordinate detection electrode and displaying them on the display device through a transparent member. (2) The coordinate reading device according to claim 1, characterized in that the electrodes for detecting coordinates in the Y direction and the Y direction are formed on a glass plate. (3) The coordinate reading device according to claim 1, wherein the Y-direction and Y-direction coordinate detection electrodes are metal electrodes with a thickness of 3 μm or less. (4) The coordinate reading V device according to claim 1, wherein the coordinate detection electrodes in the Y direction and the Y direction are transparent electrodes made of metal oxide. (The coordinate reading device according to claim 1, characterized in that the ω display device is a liquid crystal panel. A coordinate reading device according to claim 1.