JPS6184729A - Through-vision finger touch input device - Google Patents

Abstract

PURPOSE:To maintain high reliability and to minimize the error of a detected coordinates position by making the finger tip approach to the crossover of respective electrodes and detecting a coordinates position with the change of static capacity. CONSTITUTION:On a display surface 1 of CRT, etc., a film-shaped straight line-shaped transparent conductive electrode Xn is installed mutually in parallel and at constant pitch PX as the first electrode, and the second electrode Yn is installed in the same manner intersecting orthogonally with the first electrode Xn. A transparent film-shaped conductive material 2 lies between both electrodes X and Y intersecting positions, and both these electrode surfaces and a conductive material are covered with a transparent film-shaped insulating material 3, and installed tightly on the display 1. Thus, when the finger tip through the insulating material 3 touches the intersecting position, a capacity increases in accordance with a human body effect and a voltage of detecting output terminals becomes unbalanced. The result is applied to the data processing device, etc., and the coordinates position can be detected by means of the finger touch.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention (1) Inputting information by touching a predetermined coordinate position with a fingertip on the display screen of a cathode ray tube (hereinafter referred to as CRT) display device, etc. It's about input devices.

[Conventional technology]

It is used as input devices such as CRT displays attached to various data processing devices such as electronic computers and control devices.
Published by McGraw-Hill Publishing Co., Ltd. on June 80, 2015, pp. 122 to 137. ``Perspective type finger-touch human-powered device with 7 coordinate detection planes superimposed on a display screen''! 7. As disclosed in the disclosure, is the electrode group made of transparent conductive material orthogonal to each other on the display surface of the CRT? At the same time, a gap 7i'' is provided on these opposing surfaces.
A means for detecting conduction due to stiff contact by bringing the L and M intersecting electrodes into contact with each other with the touch of a finger;
CEcTG-) A plurality of source beams are projected onto the surface from the sides that are directly opposite to each other, and a valley beam is received at the opposite side, and the light is blocked by the fingertips. ? A means of detecting and determining the coordinate position is generally used.

[Problem that the invention seeks to solve]

However, in the former method, the transparent conductive material film constituting the electrode group has poor restoring force, and there is a risk that the cows will be in permanent contact with each other, while in the latter method,
Although the surface of the CRT is curved, the light beam travels in a straight line, so the distance between the CRT surface and the light beam becomes large in the peripheral area of the CRT surface. The difference from the coordinate detection position due to beam shading becomes large, resulting in disadvantages such as errors in detecting the information input position.

The present invention has the purpose of fundamentally solving the drawbacks of the conventional art, and is highly reliable and free from detection errors. The present invention provides an extremely effective see-through type finger touch input device that does not cause noise.

[Means to solve the problem]

Therefore, the present invention is constructed by the following means.

That is, a plurality of parallel first electrodes made of a linear transparent conductive material, a plurality of similar second electrodes intersecting these, and a plurality of parallel electrodes interposed at least at each intersection of these electrodes. A transparent dielectric material that completely forms a predetermined capacitance between opposing surfaces is provided on the display surface, and the entire surface of each electrode is covered with a transparent insulating material, and the capacitance changes at each intersection. The detection circuit that detects the coordinate position is made of gold film.

[For production]

Once, when a fingertip approaches the intersection of each electrode, the capacitance of the intersection changes due to the human body effect, and this is detected as a coordinate position, and information is input by finger touch accordingly.

[Smile example]

Examples below? Figure 76 provides a detailed explanation of the invention.

FIG. 1 is a perspective view showing that electrodes Xn' and Xn+ 1 made of a transparent conductive material in the form of a film and in a straight line are placed parallel to each other as the first electrodes on the display surface 1 of a CRT or the like. , are provided at a constant pitch/'Px, and similar electrodes 'fn, Yn+1 are provided orthogonally to these.
are provided as second electrodes at a constant pitch Py 9, and a transparent film-like dielectric material 2 is interposed at least at each of their intersections. , Xn+l and Yn, Yn
A predetermined capacitance is completely formed between +x and +x.

In addition, a transparent film-like insulating material 3 is provided on the surface 1ttll of each group %Xn, Xn+t, Yn, Yn+1, so that each group ff1Xn, Xn+t
, Yn, Yn+t, and the dielectric material 2, and are integrated and laminated with these and placed in close contact with the display surface 1. , electrode X.

~X1 is connected to one side of the differential amplifier DA, +5, and the other input 2 through the switch group SWxk, or is disconnected,
Denden Y. -Y, the switch group SWy is connected to the common power supply or high frequency power supply (hereinafter referred to as power supply) HFG, while the switch fl: SW7, SWx
ij, control unit such as microprocessor C0NTK
Engineering! 11 control, and each switch SVn''Sys of the switch group 5vly is driven sequentially and repeatedly from a state in which all common potentials are selected to a state in which the power supply HF"G' is selected.

In addition, each switch Sxo to SX4 of the switch group SWx
However, the switch S7o is always in a state of petition.
87s (') In each period of the driving cycle, those that are in momentary contact with each other are moved as a pair, and the one in the preceding rank is selected by human power L, and the one in the next rank is selected by human power I! This is of course done sequentially and repeatedly for each pair.

Therefore, the electrode Yo = Ys is one plate then the power supply HFG
During the period when the electrode X0 is connected to the input Il, the electrode X1 is connected to the input Il.In the next similar period, the electrode X1 is connected to the input crab 1, and the electrode X2 is connected to the input crab 2. From then on, 1! Extremely X! and Xs, X, s and X4, X4
and Xo % Once again, Xo and X+ are connected to input crab 1 and Iz, respectively, and the same state Wk is repeated.

On the other hand, the capacitance (hereinafter referred to as capacitance) Co formed at each intersection of valley N, 'Ff-Xn = X4 and Yo -Ys
o~C4S have the same value as y, and p, ta
Yo is connected to the t source HFG and the electrode X.

If we take example 7 when the electrode The currents flowing through the resistors R+ and Ra are equal, and the voltages at these terminals are also equal, and the two input voltages cancel each other out at the differential increase Ii @ device DA 4C, and the detection force D
OK, do not send.

On the other hand, when the fingertip comes into contact with the intersection of the electrodes Xo and Yo through the insulating material 37, the capacitance Coo increases to C0° + dC according to the human body effect caused by the approach of the fingertip, and the detection state is shown in FIG. As shown, electrode Xo.

A current of lx+>ixa flows from tQHFG to Xl, and accordingly, the terminal voltages of resistors R+ and Rz become unbalanced, and the difference between both input voltages is sent out as a detection force Do.

Then, this is converted to direct current by the detection circuit DET,
Since it is given to the control unit C0NT, the control unit C0NT 1
':C, switch group SWx, 5Wyk Controlling signal status 7! i: Determine the order of the paddle, input IIk, selected switch, and power supply HFGk, and send out coordinate signals DSx and DSyk indicating the detected sitting position t', which is shown in the figure. In order to provide the information to the data processing device omitted above, it is possible to detect the coordinate position ti'i given by the manual instruction of information by a finger touch.

Therefore, the detection accuracy of the coordinate position indicated by each electrode x6~X, , yo - Y, the extent of the human body effect, '! !
Depending on the same wave number of the source HFG and the dielectric constant of the dielectric material,
Each of the poles Xo ~
It is possible to detect the finger touch coordinate position 1t by using the metal material.

In addition, since the valley electrodes are integrated, they are highly reliable and can be bent, and even if the display surface 1 is curved, each electrode is in the form of a film, so it can be attached to the display surface 1, such as a CRT, etc. Is there an error between the display and the finger touch detection position? Does not occur.

In addition, each electrode Xo "Xs, Yo -Ys IC/
ri, I T.

(Indum Tin Oxide) or the like may be used, and as the dielectric material 2, various transparent insulating films may be used.

By the way, U as display surface 1, not only CRT but also various display surfaces? It may be used, and the electrodes X0 to X4 and Y o =
The same thing can be done by intersecting Y s at a predetermined angle.9
, the electrodes X0-Xl, yo4, y5 are directly applied to the display surface 1 without forming the dielectric material 2? It may be prepared as a separate film and attached. In FIG. 3, the electrodes Xu = Xl and YO to Y5 are connected to J? The opposite may be used, and the control section C0NT and the differential amplifier DA may be replaced with other equivalent components.

In addition, the number of electrodes Xo = Xl, Yo - Ys,
The dielectric material 2 may be added depending on the conditions, and the dielectric material 2 may be interposed not only at each intersection but also over the entire surface between the electrodes, allowing for various modifications.

〔Effect of the invention〕

Damn it! As is clear from the above description, according to the present invention,
Since all capacitance changes caused by the fingertip are detected without using mechanical displacement, it is highly reliable and does not produce any error sound at the detected coordinate position, making it extremely effective as a finger touch input means that uses various display device sounds. .

[Brief explanation of drawings]

Embodiments of the present invention are shown in the figures; FIG. 1 is an exploded perspective view, and FIG.
The figure is a circuit diagram of the detection circuit, and FIG. 3 is a circuit diagram showing the detection state. 1... Display surface, 2... Dielectric material, 3... Insulating material, Xn, Xn+1, Xo・-Xl
・ ・ ・ ・ N pole (first electrode), Yn, Y
n+x, Y6 = Y5 @ @...' electrode (second electrode), Px, Py... pitch, W...
Width, HFG...Power supply (high frequency control), SWx,
SW7...Switch group, coo-045...
・Capacitance (electrostatic capacitance), DA ・・・Differential amplifier, DE
T...detection circuit, C0NT...-control unit.

Claims (1)

[Claims] A plurality of mutually parallel first electrodes made of linear transparent conductive material provided on the display surface, and a linear transparent conductive material provided on the display surface intersecting each of the first electrodes. a plurality of mutually parallel second electrodes, and a transparent dielectric material that forms a predetermined capacitance between the opposing electrodes interposed at least at each intersection between the second electrodes and the first electrodes; A transparent insulating material that covers each of the electrodes from the surface side, and a detection circuit that detects a change in capacitance at each of the intersections as a coordinate position of the intersection. .