JPS59121533A - Coordinate detector - Google Patents

Abstract

PURPOSE:To find a malfunction in the initial stage, by monitoring always the detection panel surface to display a corresponding message if the surface of a protection film is polluted with sticking of water, sweat or the like and coordinate detection is abnormal. CONSTITUTION:A monitor part 8 provided for monitoring the surface state of a detection panel PN is constituted with the first memory 9 where the coordinate signal transmitted from a recognizing part 7 is stored, the second memory 10 where the coordinate signal detected in the preceding cycle is stored, and a comparator 11 for these memories. If the same coordinate signal is detected prescribed-number of times by the monitor part 8, a message transmitting circuit 14 is started by the output, and a message, for example, ''stop operation'' is displayed on a display part 15. If the same coordinate signal is detected continuously in spite of the operator stops the operation, a message, for example, ''sweep panel surface'' is displayed, and thus, the malfunction is found in the initial stage.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a coordinate detection device, and more particularly to a coordinate detection device adapted to monitor contamination on the surface of a detection bar (1). Background of the Technology The device ζt, which detects a specified position using changes in capacitance, requires only an electrode to be used as the contact point indicated by the human body. Since no mechanical contact is required, it is easy to make the detection pile transparent.Therefore, it has recently attracted attention as an information input means in combination with a display device, etc.In other words, it is possible to make the detection pile transparent in front of the display surface of the display device. A bar A/L is installed to detect the position of the information 4J/J, and the desired information is input by pointing the contact part on the bar A/B corresponding to the display position of the information 4J/J.
(C) Prior art and problems Various coordinate detection devices having such a detection panel have been proposed. In RJ, for example, touch detection electrodes X and Y1 to Y4 are arranged on a thin plate-like force base, and a protective film of an absolute H film is formed on these touch detection electrodes.

Then, a contact portion TCH is formed in a region corresponding to each intersection of the touch detection electrodes on the protective film. Further, l shown surrounded by a dashed line is a touch detection section, and the touch detection section ] is for detecting a change in capacitance due to a touch operation on each of the touch detection electrodes, and the following jl.! Take success. That is, a capacitor Ca and an inductor La are connected in parallel to form a resonant circuit 2, and an impedance element R is connected to the resonant circuit 2. Then, one input of the comparator 3, ff, is connected to the connection point between the impedance element R and the resonant circuit.
i't is connected, and the output side of the comparator 3 is further connected to the input side of the smoothing circuit 4. Further, an oscillator O5C is connected to the impedance element R, and this oscillator O8C supplies an AC signal having a frequency that resonates with the resonant circuit 2 to the resonant circuit 2 via the impedance element R. Reference numeral 5 denotes a touch detection electrode switching switch □17 constructed of, for example, an analog multiplexer, and the touch detection electrodes X1 to X4, Y, -Y4 are sequentially selected one by one by the changeover switch 5, and the inductance element Lb is selected one by one. It is connected to the resonant circuit 2 via the resonant circuit 2. In addition, each touch detection ilt
In order to reduce the adjacent capacitance between ti, a switch 6 is connected between each touch detection electrode All non-selected touch detection electrodes except one selected touch detection electrode (d) are clamped to the ground level.

The recognition unit 7 is composed of, for example, a microglosser unit, and its function is to control the electrode changeover switch 5 and the clamp changeover switch f], and when the detection signal from the touch detection unit 1 is input, it performs the specified detection. It has a function of sending out coordinate signals X1-Yj corresponding to the electrodes.

In such a +f+ configuration, assuming that the operator gives an instruction by touching the contact portion TCH at the intersection of touch detection electrodes X and Y, for example, the touch detection electrodes and its value will be different. When there is a change in the capacitance of the touch detection electrodes sequentially and selectively connected to the touch detection section 1, the output becomes '+L'/level. In this example, when the touch detection electrodes X and Yl are selectively connected to the touch detection section 1, the touch detection section 1
The output of the touch detection section 1 becomes the "L" level, and at the timing when the other touch detection electrodes are switched and connected to the touch detection section 1, the output of the touch detection section 1 becomes the "H" level. In this way, when the entire type (4.j) is scanned once, the detection signal - from the detection unit 1i1
(Then, when the detection signal from the 1ζ pole Y1 comes, the coordinates 47 from 1.ig ii5 and 7 at the same time? -"j
j X(・Yl is sent, by the way, such 44
If the surface of the protective film of the detection panel PH in the nine precepts coordinate detection device h/'c becomes contaminated with water, sweat, etc., the shape will change due to the contamination! There has been a problem in that due to the impedance passed between the touch detection electrodes, the \f and M portions corresponding to one touch detection section, which were not originally instructed, are detected as if they had been instructed. These problems have the disadvantage that if the operator of this device is a novice, he or she will not be able to figure out the cause of the problem, and it will take a considerable amount of time to take appropriate measures such as cleaning the surface of the detection panel (i). .

(d) Purpose of the Invention In view of the above-mentioned drawbacks of the conventional art, the present invention provides a coordinate detection device that constantly monitors the detection pie/layer surface and displays a message to that effect when there is an abnormality in coordinate detection. It is intended for the purpose of providing.

(e) Structure and object of the invention According to the present invention, a detection pile having a plurality of touch detection electrodes arranged regularly in accordance with coordinate positions to be detected; a touch detection section that detects a change in the electrical characteristics of the detection electrode based on an instruction operation to the detection pile; and a seat 4 that temporarily stores the detection signal from the touch detection section and corresponds to the instructed detection electrode. 〕;
In the configuration mainly consisting of a recognition section that sends out 9 signals, a monitoring section that compares whether or not the coordinate signals sequentially sent out from the recognition section are the same; The present invention is constructed by providing a coordinate detection device whose signature is a display device that displays a message indicating that an abnormality has been detected when an abnormality is detected.

(Embodiments of the invention Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. .

21'', 21 is a block diagram for explaining the i!> configuration of the coordinate detection device i'7. according to the present invention, and the same parts as in FIG. 1 are given the same reference numerals. A monitoring unit 8 for monitoring the surface condition of the recognition unit 11 has a first memory 9 that stores the coordinate signals sent from the hough, and a first memory 9 that stores the position () and ¥ signal detected on the previous circumferential groove j. A comparator 11 that compares the contents of the second memory 10 with the contents of the second memory 10 and Z, and a counter 12 that counts the number of times when the comparator 11 is -5. In addition, the front blade machining device 13 is connected to the monitoring section 8.
By the predetermined count output of the counter 12, the predetermined lil
P/'Jt which detected the same number of touches (when all the signals were tIJ, i.e., pσ's touch difference '7j';
% It consists of a message sending circuit 14 for sending a message to that effect and a message display section 15.

The operation of the coordinate (1↑) output device as described above will be explained using the flowchart in FIG.

When the monitoring unit 8 outputs the same coordinate signal Qx a predetermined number of times (a value set in the counter 12 in advance), the message sending circuit 14 is activated by the output, and first, the display unit 15 displays, for example, “1 Message that says "Please do it"■
Display. Even though the operator carried out the operation in the Middle East,
If the same signal is detected, a message such as ``Please wipe the surface of the pipe'' will follow.

Display sage (2). On the other hand, if the operator stops the operation and coordinate No. 46 is not detected, a message such as ``It was an erroneous operation'' will be displayed, indicating that the same coordinate point has been pointed for a long time.

Although the case where the same coordinate point is detected consecutively a predetermined number of times has been described above, it is also assumed that the IM number gauge is detected in different numbers due to contamination on the surface of the detection panel PN.

In such a case, first display a message such as ``Please take your hands off the panel surface'' on the display unit 15, and if the ρ signal is detected and accepted, ``Please wipe the panel surface''. etc. will be displayed.

On the other hand, if the coordinate signal is not detected by canceling the instruction operation, it is also possible to display r 2 j;.

Possible display methods include a method of displaying coordinate points that are considered to be contaminated, and a method of linking or highlighting (to make the display more noticeable).

(g) Effects of the invention As explained in detail above, the unexploded +9J coordinate detection device constantly monitors the surface of the detection pile, so it can quickly prevent malfunctions caused by contaminated Sl. This has a great practical effect: (1) by discovering this, (2) the time needed to deal with it can be shortened.

[Brief explanation of the drawing]

Figure 1 shows the basic principles of coordinate detection.
, FIG. 2 is a block diagram showing the 114 configuration of the coordinate detecting device according to the present invention, and No. 3121 is a flow chart for explaining the operation of the J14p detection device of Kinoe IyJ. In the figure, 1 is the touch cane output, and 7 is the recognition unit. 8 is monitoring? 'i (i, 9 and lO are coordinate memories, 11
is a comparator, 12 is a counter, 13 is a display device, 14
is the message sending circuit, 15 is the display tjll r PN
indicate detection bars 1-1, respectively. Figure 2 Figure 3

Claims (1)

[Claims] A detection panel that has a plurality of touch detection electrodes that have a regular contact resistance of 1δ corresponding to the coordinate position to be detected, and a touch detection that detects changes in the electrical characteristics of the detection electrodes based on instruction operations to the detection panel. and a recognition section that temporarily stores detection signals from the touch detection section and sends out coordinate signals corresponding to designated detection electrodes, wherein the coordinate signals sequentially sent out from the recognition section are It is characterized by the addition of a monitoring section that compares whether or not they are the same, and a display device that displays a message indicating that an abnormality has been detected when the monitoring section detects a predetermined same-ship coordinate signal. coordinate detection device.