JP2001084108A - Device for inputting and detecting and displaying coordinate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for inputting and detecting and displaying coordinates for reducing any erroneous input by allowing an operator to know the start and end timing of an input and an input state. SOLUTION: This device is provided with a panel 20 using an LCD(liquid crystal device) display to which coordinates are inputted by a pen 22. This panel 20 is provided with a light emitting diode 11 for emitting lights in parallel with the panel 20 with prescribed width to a vertical direction, a phototransistor 12 for receiving lights emitted by the light emitting diode 11, a display 16 for displaying display elements including coordinate instructing elements on the display device, and a display control circuit 14 for controlling the display device 16 according to the light receiving state of the phototransistor 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a display device, and more particularly to a coordinate input / detection / display device for detecting and displaying coordinates input from a coordinate input surface.

[0002]

2. Description of the Related Art At present, a coordinate input surface is provided, on which a coordinate input by a finger or a pen is detected.
There is a detection and display device. Such a coordinate input / detection / display device is called a touch panel type. In combination with a display device such as a personal computer (personal computer) or a display, a touch panel type coordinate input / detection / display device is used.
Some constitute a detection / display device.

[0003] A touch panel type coordinate input / detection / display device includes electrostatic or electromagnetic induction when a pen touches a coordinate input surface or when the pen approaches a coordinate input surface more than a predetermined distance. Some of them detect coordinates specified by a pen based on a change caused by the change and display the coordinates.

[0004] For example, see Japanese Patent Application Laid-Open No. 61-239322.
As described in Japanese Patent Application Laid-Open Publication No. Hei 9 (1994), surface acoustic waves are transmitted to the coordinate input surface, and the coordinates specified by the finger or pen are detected by the attenuation of the surface acoustic waves caused by the finger or pen touching the coordinate input surface. Some are displayed. Such a touch panel-type coordinate input / detection / display device has been intensively studied as a simple information input tool with the spread of personal computers.

[0005]

However, the touch panel type coordinate input / detection / display apparatus described above still has the following problems for full-scale practical use. That is, in the configuration that detects the coordinates input electrostatically or by electromagnetic induction, when the coordinate input surface and the pen approach each other to a predetermined distance or less, an electrical change occurs in both, and the coordinates of the coordinates are changed. Input starts. Further, when the coordinate input surface and the pen are separated from each other by a predetermined distance or more, there is no electrical change between the two and the input of the coordinates is completed.

Therefore, the operator cannot know the exact timing of starting and ending the coordinate input to the coordinate input / detection / display device. If there is a difference between this timing and the timing of starting and ending the coordinate input intended by the operator, the coordinate that the operator tried to input and the actually input coordinate are different, and an erroneous input occurs. Sometimes.

[0007] Further, the configuration for detecting the input coordinates by utilizing the attenuation of the surface acoustic wave is configured on the assumption that the input is mainly performed by a finger. In such a coordinate input / detection / display device, the operator inputs a straight line with a pen (which is more elastic than a finger) made of a member whose impact of pressing is absorbed on the coordinate input surface more than a finger. In the case of pressing, at the time of pressing, although sufficient attenuation of the surface acoustic wave for detection is obtained,
When the pen is moved thereafter, the input straight line may be broken due to weak attenuation.

When the operator presses the pen against the coordinate input surface with a stronger force in order to prevent such a phenomenon, the pen undergoes a stress receiving distortion due to its own elasticity, and attempts to restore the distortion. Force is generated. As a result, the force by which the operator presses the pen against the coordinate input surface becomes unstable, and the surface acoustic wave may not be able to be stably attenuated.

Even in such a case, the operator cannot know that the attenuation of the surface acoustic wave is unstable, so that the operator keeps inputting as it is. For this reason, depending on the state, coordinate input /
The detection / display device may mistakenly determine that the input has been completed or interrupted.

A coordinate input / detection / display device for solving such a problem is disclosed in Japanese Patent Application Laid-Open No. Hei 5-17369.
9 and Japanese Patent Application Laid-Open No. 9-319501.
Japanese Patent Application Nos. 127035 and 10-230960 have proposed optical coordinate input / detection / display devices.

Such an optical coordinate input / detection / display device has the advantage that the above-mentioned problems can be solved and the configuration of the coordinate input / detection / display device can be simplified. However, even in such an optical type coordinate input / detection / display device, there is room for further improvement in that the operator accurately recognizes the timing of inputting the coordinate input and inputs the desired coordinate accurately. Have left.

The present invention has been made in view of the above points, and allows an operator to know the start and end timings of an input and the input state, thereby reducing the possibility of erroneous input. It is an object to provide a detection / display device.

[0013]

The above-mentioned problems can be solved by the following means. That is, the invention according to claim 1 includes a coordinate input / detection device that has a coordinate input surface on which coordinates are input by the instruction means, and detects the input coordinates, and a coordinate input / detection device that inputs the coordinates. A display device for displaying information based on coordinates;
A display device, comprising: a light emitting unit that emits light having a predetermined width in a direction parallel to the coordinate input surface and perpendicular to the coordinate input surface; and receiving light emitted by the light emitting unit. Light receiving means, display means for displaying a display element including a coordinate indicating element on the display device, and display control means for controlling the display means according to a light receiving state of the light receiving means. It is.

With this configuration, when the light emitted from the light emitting means is blocked by the instruction means, the light receiving state of the light receiving means changes. Since the display of the display element including the coordinate indicating element is controlled according to the change in the light receiving state, the display element including the coordinate indicating element can be displayed on the display device according to the state of the indicating means. Become.

According to a second aspect of the present invention, the coordinate input / output
The detecting device has a plurality of coordinate detecting light emitting means and a plurality of coordinate detecting light receiving means, and detects coordinates of the pointing means for interrupting an optical path between the coordinate detecting light emitting means and the coordinate detecting light receiving means. It is characterized by the following.

With this configuration, it is possible to use the coordinate input / detection device of the optical system according to the present invention.
A display device can be configured.

According to a third aspect of the present invention, the coordinate input / input
The detection device has image input means for inputting an image on the coordinate input surface, and detects coordinates of the pointing means from an image of the pointing means input by the image input means. is there.

With this configuration, it is possible to use the coordinate input / detection / detection device of the optical system according to the present invention.
A display device can be configured.

According to a fourth aspect of the present invention, light having a predetermined width in a direction perpendicular to the coordinate input surface emitted by the light emitting means contacts an optical path of the light with the coordinate input surface. Things.

With this configuration, the light receiving state of the light receiving means changes when the pointing means is relatively close to the coordinate input surface. Since the display of the display element including the coordinate indicating element is controlled in accordance with the change of the light receiving state, the display element including the coordinate indicating element is displayed on the display device immediately before the input operation by the indicating means is performed. Will be able to

According to a fifth aspect of the present invention, light having a predetermined width in a direction perpendicular to the coordinate input surface emitted by the light emitting means is provided at a predetermined distance between an optical path thereof and the coordinate input surface. It is characterized by having.

With this configuration, the light receiving state of the light receiving means changes when the pointing means is relatively far from the coordinate input surface. Since the display of the display element including the coordinate indicating element is controlled according to the change in the light receiving state, the display element including the coordinate indicating element can be displayed on the display device at an early stage of the input operation by the indicating means. Become like

According to a sixth aspect of the present invention, the display control means changes the display state of the coordinate pointing element according to the size and shape of the pointing means.

With this configuration, it is easy to recognize the range of coordinates indicated by the indicating means.

The invention according to claim 7 is characterized in that a plurality of the light receiving means are provided in a direction perpendicular to the coordinate input surface.

With this configuration, the light receiving state of each light receiving unit changes with the coordinate input operation of the instruction unit. Since the display of the display element including the coordinate indicating element is controlled according to the change in the light receiving state, a plurality of types of control can be performed based on the input operation by the indicating means.

According to an eighth aspect of the present invention, at least one of the plurality of light receiving means is provided so as to contact an adjacent light receiving means.

With this configuration, the total length of the light receiving means in the direction perpendicular to the coordinate input surface can be reduced. Therefore, even when the width of the light emitted from the light emitting unit is narrow, a plurality of types of control can be performed based on the input operation by the instruction unit.

According to a ninth aspect of the present invention, at least one of the plurality of light receiving means is provided at a predetermined distance from an adjacent light receiving means.

With such a configuration, the light receiving state of the plurality of light receiving means provided at predetermined intervals changes with the coordinate input operation of the instruction means. Since the display of the display element including the coordinate indicating element is controlled according to the change, a plurality of types of control can be performed immediately before the input by the indicating means and at a relatively early stage of the input.

According to a tenth aspect of the present invention, the display control means controls the display means in accordance with a light receiving state of at least two of the plurality of light receiving means. is there.

With this configuration, the state (inclination, etc.) of the pointing means can be detected in more detail, and display control of display elements including the coordinate pointing element can be performed based on the detection result.

According to an eleventh aspect of the present invention, the light receiving means includes a disturbance light eliminating means for eliminating disturbance light other than the light emitted from the light emitting means.

With this configuration, it is possible to prevent disturbance light from entering the light receiving means, and to stably reflect the light shielding state of the light emitted by the light emitting means in the light receiving state of the light receiving means.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, coordinate input / output according to the present invention is described.
A preferred embodiment of the detection / display device will be described in detail with reference to the drawings.

Prior to describing the first, second, third and fourth embodiments of the present invention, the configuration and coordinates of a coordinate input / detection / display device to which the present invention is applied. The detection principle will be described with four examples.

(Configuration of Coordinate Input / Detection / Display Apparatus to Which the Present Invention is Applied and Principle of Coordinate Detection) First Example FIG. 1 shows coordinates for explaining the coordinate input / detection / display apparatus of the first example. It is a top view of an input / detection / display device. The angle detecting means having the configuration shown in the figure is provided at a position where the panel 43 serving as a coordinate input surface on which coordinates are input by the pointing means 15 such as a finger or a pointing rod, and a light emitting means and a position at which reflected light of light emitted by the light emitting means can be received. Light-receiving and light-emitting units 42a and 42b, which are provided light-receiving units, and a retroreflective member 4 that is a reflecting unit that reflects light emitted by the light-receiving and light-emitting units 42a and 42b recursively.
4 and the light reflected and reflected by the retroreflective member 44 in accordance with the angle of incidence on the light emitting and receiving units 42a and 42b.
a and a condenser lens 50 (FIGS. 3 to 5) as optical means for receiving light at different positions of 42b.

In the coordinate input / detection / display device of the first example, the light receiving / emitting units 42a and 42b are light emitting means for coordinate detection and light receiving means for coordinate detection, respectively. Further, the coordinate input / detection device of the coordinate input / detection / display device of the first example is composed of light emitting / receiving units 42a and 42b and a panel 43. -Construct a display device. A CRT (Cathoe-Ray Tube) for electronically displaying an image as the panel 43
A display device such as a display, an LCD (Liquid crystal Device) display, or a plasma display may be used to constitute a coordinate input / detection / display device.

The light emitted from the light source 41 incorporated in the light receiving / emitting section 42a spreads in a fan shape over the entire coordinate input surface as a light beam having L1, L2,... For example, when attention is paid to the optical axis L3 of such light beams, the optical axis L3
(Optical axis L3 ') is reflected by the recursive retroreflective member 44 and travels through the same optical axis as the optical axis L3 toward the light emitting / receiving section 42a. The light receiving / emitting section 42a is provided with a light receiving means described later, and receives the reflected light. Such a light receiving means is configured to be able to receive the reflected light of all the light fluxes represented by the optical axes L1, L2,... Ln.

When the operator places the pointing means 15 such as a finger or a pen at one point in the panel 43 and inputs coordinates, a part of the light beam including the optical axes L1, L2,... Ln is blocked by the pointing means 15, It does not reach the retroreflective member 44. For this reason, the reflected light of the light beam blocked by the indicating means 15 is not received by the light receiving means 12a, and the point where the indicating means 15 is placed, that is, the optical axis of the light passing through the input coordinates is identified from the light beam not received. it can.

Similarly, the reflected light of the light beam emitted from the light source 41 of the light emitting / receiving section 42b can be received, and the optical axis passing through the coordinates input by the instruction means 15 can be identified. In FIG. 1, the optical axis Ln emitted from the light emitting / receiving unit 42a,
An optical axis Rn emitted from 12b is an optical axis passing through the coordinates input by the instruction means 15. The coordinates of the pointing means 15 can be calculated as such an intersection of the optical axis Ln and the optical axis Rn.

At this time, in the coordinate input / detection / display device of the first example, as shown in FIG. 2, the designated point (the inputted coordinates) designated by the pointing means 15 and the reference point (the light source 4) on the panel 43.
(Center point of the light source 41) and an angle θ _L and an angle θ _R between the straight line and a reference line on the panel 43 (a straight line connecting the reference points of the light source 41). The optical axis Ln and the optical axis Rn passing through the set coordinates are detected.
Then, as will be described later, the coordinates of the pointing means 15 are detected using the angles θ _L and θ _R and the length W of the reference line on the panel 43 (the distance between the light emitting / receiving portions 42a and 42b). are doing.

Next, in order to explain a specific calculation for obtaining the angles θ _L and θ _R , the light emitting / receiving section 4
2a, the configuration of the light receiving / emitting unit 42b and a mechanism for finding the optical axis of the shielded light will be described. In addition, the light emitting and receiving unit 42a,
42b is similarly configured. For this reason, here, only the configuration relating to the light emitting / receiving unit 42a is illustrated, and the description relating to the light emitting / receiving unit 42b is omitted.

FIG. 3 is a diagram schematically showing the configuration of the light emitting / receiving section 42a, and is a view of the light emitting / receiving section 42a viewed from a direction perpendicular to the panel 43. The light receiving / emitting section 42a is roughly composed of a light source 41, a condenser lens 50, and a light receiving element 51. Light source 4
Numeral 1 illuminates a fan-shaped light on the side opposite to the light receiving element 51, and the fan-shaped light is a set of light beams emitted or reflected in the directions of arrows 53, 54, 58, and 59. Think. The light emitted in the direction of the arrow 53 is reflected by the reflecting member in the direction of the arrow 54. Then, the light advances through the condenser lens 50 and is received at the position of the point 51 b on the light receiving element 51. Light emitted in the direction of arrow 58 is reflected by the reflecting member in the direction of arrow 59 and received at the position of point 51 a on light receiving element 51.

As described above, the optical axis of the light emitted from the light source 41 and reflected by the retroreflecting member has a one-to-one relationship with the light receiving position. From this, the light receiving element 51
By examining the above received light intensity distribution, it is possible to know through which optical axis the shielded light has been irradiated or reflected.
Then, such an optical axis is connected to the light receiving / emitting unit 42a, the light receiving / emitting unit 4
By obtaining both of 2b, two straight lines intersecting at the point input by the instruction means 15 can be obtained.

In the coordinate input / detection / display device of the second example, the light receiving element 51 is provided with a CCD (Charged Cupped Device).
ce) A signal representing the light intensity distribution on the light receiving element 51 is output to the outside using a line sensor. In this specification, a signal representing the received light intensity distribution on the light receiving element 51 output from the light receiving element 51 is hereinafter referred to as a light intensity distribution signal.

FIG. 4 is a view for explaining the relationship between the light receiving intensity on the light receiving element 51 and the optical axis of the shielded light. In FIG. 4, the condenser lens 50 is arranged so that the center of the condenser lens 50 coincides with the light source 41. The light emitted from the light source 41 is recursively reflected by the retroreflective member 44, and is received on the light receiving element 51 through the center of the condenser lens 50. At this time, the intensity distribution on the light receiving element 51 becomes almost uniform unless there is a light shielding element on the coordinate input surface. But,
When the light is blocked by the indicating means 15 shown in the figure, the light receiving intensity of the light receiving position of the light passing through the indicating means 15 on the light receiving element 51 is weakened. Note that such a point on the light receiving element 51 having a low light receiving intensity is hereinafter referred to as a dark point.

FIG. 4 shows a dark point position D _n (hereinafter also referred to as a dip position) with reference to the center point of the light receiving element 51. This Dn, the corresponding relationship represented by an angle theta _n with the following equation, which forms a straight line passing through the center point of the straight line and the light receiving element 51 through the dark point (1). θ _n = arctan (D _n / f) Expression (1) _where f in Expression (1) is a distance between the center of the condenser lens 50 and the surface of the light receiving element 51 as shown in FIG.

Here, the angle θ _L shown in FIG. 2 is defined by a straight line L having an angle θ _L and a straight line passing through the center of the light receiving element 51 and the center of the condenser lens 50 as shown in the following equation (2). Is represented by a function of the angle θ _nL . θ _L = g (θ _nL ) Expression (2) where θ _nL = arctan (D _nL / f) Expression (3) The relationship between Expressions (2) and (3) is the same for the light emitting and receiving unit 42b. Holds. Therefore, θ _n on the light emitting / receiving section side is set to θ
and _nR, expressed a theta _R Figure _{2, θ R = h (θ} nR) ... Equation (4) _{where, θ nR = arctan (D nL} / f) ... Equation (5) is obtained.

Here, the coordinates P (x, y) of the point P with the origin at o in FIG. 2 are: x = W · tan θ _R / (tan θ _L + tan θ _R ) Equation (6) y = W · tan θ _L · tan θ _R / (tan θ _L + tan θ _R ) ... Expression (7) As described above, the light emitting and receiving unit 42a,
By detecting a dark spot on the light receiving element 51 provided at 42b and obtaining the distance from the dark spot to the center of the light receiving element 51, the coordinates input by the indicating means 15 can be detected.

FIG. 5 is a diagram for explaining in more detail the optical system of the light emitting / receiving section 42a shown in FIG.
Is a schematic diagram for explaining the configuration of light emission and light reception of the light emitting and receiving unit 42a, (b) is a diagram showing the configuration related to light emission of the schematic diagram of (a), and (c) is a light reception diagram of (a). FIG. The light emitting / receiving unit 42a is provided in FIGS.
The configuration of light reception and light emission shown in (c) is integrally incorporated. Note that FIGS. 5A to 5C are all viewed from the directions along the coordinate axes shown in the respective drawings.

The light source 41 of the light emitting / receiving section 42a includes a laser diode or a pinpoint LED (Light Emitting Diode).
A light source that can generate spot light with a reduced diameter to some extent, such as e), is used. Light emitted perpendicularly to the panel 43 from the light source 41 is collimated by the cylindrical lens 84 only in the x direction. The light is further condensed by the cylindrical lens 85 and the cylindrical lens 86 in the y direction in the drawing. The curvature distribution of the cylindrical lens 84, the cylindrical lens 85, and the cylindrical lens 86 is orthogonal to each other. The light that has passed through the three cylindrical lenses is
Is focused linearly. Since this light condensing portion c corresponds to the light source based on the coordinate detection principle described above, it will be referred to as a secondary light source hereinafter.

A slit (not shown) is provided at an outlet for taking out light from a beam shaping lens group consisting of a cylindrical lens 84, a cylindrical lens 85, and a cylindrical lens 86.
Is emitted toward the coordinate input surface. This irradiation light
It is folded back by the half mirror 87 and spreads like a fan when viewed from the front side of the panel 43 (FIG. 5B). At this time, since the irradiation light is collimated by the cylindrical lens 84, it does not spread in the vertical direction of the coordinate input surface, but becomes light parallel to the coordinate input surface.

The light spread on the panel 43 is reflected by the retroreflective member 44, and travels through the same optical axis as when emitted, toward the beam shaping lens group (in the direction of arrow C). Then, after passing through the half mirror 87, the light passes through the condenser lens 50 and the light receiving element 5 which is a CCD line sensor.
1 is received. At this time, the indicating means 1 is displayed on the panel 43.
If there is 5, the indicating means 15 will act as a light shield and generate a dark spot on any one of the CCD image pickup elements of the light receiving element 51. From the position on the light receiving element 51 of the CCD image pickup element which has become the dark point, D _{n of the} above-mentioned equation (2) is obtained,
Coordinate instruction unit 15 is input on the basis of the D _n can be calculated (FIG. 5 (c)).

Second Example Next, the principle of coordinate detection for a second example of a coordinate input / detection / display device to which the present invention is applied will be described.

FIG. 6 is a diagram showing a coordinate input / detection / display device of the second example. The coordinate input / detection / display device shown in FIG. 6 includes a coordinate detection light emitting unit 62a composed of Xm light emitting diodes (LEDs) arranged in the horizontal direction, and a one-to-one correspondence with each LED of the coordinate detection light emitting unit 62a. , A coordinate detection light emitting portion 62b composed of Xm phototransistors disposed opposite to each other, a coordinate detection light emitting portion 62b composed of Yn vertically arranged LEDs, and a coordinate detection light emitting portion 62b
A coordinate detection area 6 serving as a coordinate input surface is formed by the coordinate detection light-receiving unit 61b composed of Yn phototransistors arranged to face each LED in a one-to-one correspondence.

When a touch input is made to, for example, a touch portion t in the coordinate detection area 6, an optical path passing through the touch portion t is blocked, so that the amount of light received by the phototransistors 61a and 61b on the optical path decreases. Therefore, the positions of the phototransistors 61a and 61b in which the amount of received light is reduced are averaged to calculate the position P of the touch coordinates. In the coordinate input / detection / display device of the second example, the above configuration is a coordinate input / detection device, and a coordinate input / detection / display device is provided by combining the coordinate input / detection device with a display device such as a liquid crystal display. Is configured.

Third Example Next, the principle of detection of a third example of an optical coordinate input / detection / display device to which the present invention is applied will be described.
FIG. 7 is a configuration diagram of a third example of an optical coordinate input / detection / display device. The coordinate input / detection / display device of the third example shown in FIG. 7 includes a coordinate input surface 7 and light emission detection devices 70a and 70b fixed on the coordinate input surface 7 with a distance A therebetween. The light emission detecting devices 70a and 70b include light emitting units 72a and 72b as light emitting means for coordinate detection, and light receiving angle detecting units 71a and 71 as light receiving means for coordinate detection, respectively.
b.

In the third example shown in FIG.
In the display device, the coordinate input surface 7 is a square flat plate, and vertices k1 and k2 of two adjacent corners of the coordinate input surface 7 are displayed.
The light emission detection devices 70a and 70b are fixedly installed. The configuration described above is the coordinate input / detection / display device in the coordinate input / detection / display device of the third example, and the coordinate input / detection / display device is combined with a display device such as a liquid crystal display. Constitute.

In the coordinate input / detection / display device of the third example, light is emitted onto the coordinate input surface 7 from the two light emission detection devices 70a and 70b. The operator of the coordinate input / detection / display device operates the coordinate input surface 7 with the position pointing stick or the pen 15.
Indicates any position above. At this time, the light emission detection device 7
0a and 70b are reflected by the pen 15 of the light emitted by the light emission detecting devices 70a and 70b,
The light returning to 70b is detected, and the position coordinates of the pen 15 are calculated.

Here, the light emission detection devices 70a and 70b
Both the optical axis of the light emitted from the light emitting units 72a and 72b (light emitting optical axis) and the optical axis of the light received by the light receiving angle detection units 71a and 71b (light receiving optical axis) are reference points on the coordinate input surface. P
It is assumed that it is installed on the coordinate input surface 1 so as to face the direction of 0.

In FIG. 7, a line segment a1 connecting the angle k1 of the coordinate input surface 7 and the reference point P0 and a line segment a2 connecting the angle k2 (origin (0, 0)) of the coordinate input surface and the reference point P0 are shown. Direction
The light-emitting optical axis and the light-receiving optical axis of the light-emission detection devices 70a and 70b are defined as the light-emission optical axis and the light-receiving optical axis. In the illustrated example, the line segments a1 and a2 divide the angle of the coordinate input surface 7 into two equal parts at 45 °. Further, the coordinate input surface 7 is defined as X with the origin k (0, 0) at the angle k2.
-Y coordinate system is used.

FIG. 8 is a diagram showing a conceptual diagram of the configuration of the light emission detection devices 70a and 70b. Here, the light-emitting units 72 b and 72 a of the light-emission detecting device include a light source (LED) 81 and an optical lens 80. As the optical lens 80, a cylindrical lens that can change only the magnification in one direction of the image, or a toroidal lens that can change only the magnification in one direction of the image without changing the magnification depending on the incident angle is used. . Also, the light emission detection device 70
a, 70b, the light receiving angle detection units 71a, 71b
It comprises a PSD 833 and a cylindrical lens 82.

The light emission detecting device 70 configured as described above
In FIGS. 9A and 9B, as shown in FIG. 9, the light emitted from the LED 81 is condensed by an optical lens 80 disposed immediately before it so as to be parallel to the coordinate input surface 7 and become a fan-shaped beam. . At this time, the optical lens 80
The LED 81 is arranged such that the light emitting point of the LED 81 comes to the focal position. Such a configuration has an advantage that light can be more effectively used.

Here, as the LED 81, one that emits visible light or L2656 (manufactured by Hamamatsu Photonics) that emits infrared light (wavelength 890 nm) is used. The optical lens 80 has a length of 10 mm in a direction perpendicular to the coordinate input surface 7 and a length of 10 mm in a direction parallel to the coordinate input surface 1 and perpendicular to the light emitting optical axes of the light emitting units 72a and 72b. The size is about 6 mm and the focal length is about 6 mm.

The cylindrical lens 82 is arranged so as to converge the reflected light from the pen 15 in a direction parallel to the coordinate input surface 7 as shown. The collected spot light is received by the PSD 83. PSD8
Numeral 3 is elongated in a direction parallel to the coordinate input surface 7, and its light receiving surface is a PN junction surface for converting incident light into an electric signal.

Further, the PSD 83 is provided with output terminals S1 and S2 for extracting current at both ends of the light receiving surface. The currents I1 and I2, which are inversely proportional to the distance between the light receiving point S0 and the output terminal, are output from the output terminal. The position of the light receiving point S0 can be specified by A / D converting and calculating the currents I1 and I2, and furthermore, the light receiving angle of the reflected light from the pen 15 can be calculated. A control circuit for performing this arithmetic processing will be described later. Such a PSD
As the 83, a light receiving surface having a length of 13 mm in a direction parallel to the coordinate input surface 1 and a length of approximately 1 mm in a direction perpendicular to the coordinate input surface 1 may be used, for example, manufactured by Hamamatsu Photonics. S3270 can be used.

FIG. 10 is a view showing a specific arrangement example of the cylindrical lens 82 and the PSD 83 described above.
Here, the length of the cylindrical lens 82 in the direction parallel to the coordinate input surface 7 and the light receiving surface of the PSD 83 is set to one.
0 mm, the length in the direction perpendicular to the coordinate input surface 7 is 10
mm and a cylindrical lens 82
5. The distance between the optical center position and the light receiving surface of the PSD 83 is 6.
It is arranged to be 5 mm. Also, to prevent the reflected light from the pen 15 from directly entering the light receiving surface of the PSD 83,
A mask 100 made of a material such as black ABS is arranged around the cylindrical lens 82.

Further, the focal length of the cylindrical lens 82 changes because the distance between the lens and the PSD changes due to the difference in the incident angle of the light reflected by the pen 15.
Any distance between the maximum value and the minimum value of the distance between the center of the lens 9 and the light receiving surface of the PSD 83 may be used. For example,
In the case of FIG. 10, the maximum value is 9.2 mm and the minimum value is 6.
Since it is 5 mm, a cylindrical lens 82 having a focal length of about 9 mm may be used. The length of the mask 10 in the direction parallel to the coordinate input surface 7 is PS
It is sufficient that the length is larger than the length of the light receiving surface of D83 (= 13 mm), and in the case of the configuration shown in FIG.

Further, the coordinate input / output of the third example described above
The detection / display device is not limited to the configuration shown in FIG. FIG. 11 is a diagram for explaining another configuration example of the coordinate input / detection / display device of the third example. The configuration shown in FIG. 11 is different from the configuration shown in FIG. 8 in that the cylindrical lens 8
Instead of using the aperture 2, an aperture 91 having one minute transmission hole 92 is used. With this configuration, of the reflected light from the pen 15, only the light that has passed through the transmission hole 92 is received at the light receiving point S0 of the PSD 83 as spot light. Note that, as the aperture 91, a thin plate made of a material such as black ABS can be used.

FIG. 12 is a diagram showing a specific arrangement example of the aperture 91 and the PSD 83. Here, similarly to FIG. 10, when the length of the light receiving surface of the PSD 83 is 13 mm,
The aperture 91 is arranged at a position that is half the distance from the light receiving surface of the PSD 83 by 6.5 mm so that the light receiving surface of the PSD 83 and the surface thereof are parallel to each other.

The size of the aperture 91 is
5 is preferably larger than the light receiving surface of PSD 83 so that the reflected light from 5 does not directly enter the light receiving surface of PSD 83. For example, the size of the light receiving surface of the PSD is 13 mm × 1 mm
In contrast, the size of the aperture 91 is 15 mm × 3 mm
Degree.

The transmission hole 92 is shorter than the length of the light receiving surface of the PSD 83 (13 mm) in the direction parallel to the coordinate input surface 1, and the length of the light receiving surface of the PSD 83 (1 mm) in the direction perpendicular to the coordinate input surface 1. Longer than In the example of FIG.
× 2 mm in size.

8 and 11 described above (LED 81, optical lens 80, PSD 83,
The cylindrical lens 82 or the aperture 91)
The above-described arrangement may be maintained and the housing may be integrally molded. However, the light emitting units 72a and 72b (LED 81 and optical lens 80) and the light receiving angle detecting units 71a and 71b (PS
D83, cylindrical lens 82 or aperture 9
In 1), it is necessary to arrange them as close as possible so as not to hinder emission and reception of light. Further, it is necessary that the emission optical axis of the infrared light emitted from the LED 81 and the light reception optical axis of the infrared light received by the cylindrical lens 82 or the aperture 91 be arranged in the same direction.

As described above, by integrally forming the light emitting units 72a and 72b and the light receiving angle detecting units 71a and 71b, the light emitting detecting devices 70a and 70b can be reduced to 20 mm × 15 m.
The size can be about mx 10 mm. Therefore, in the coordinate input / detection / display device of the third example, it is possible to reduce the size of the configuration for coordinate detection as compared with the configuration of performing position detection by scanning a light beam using a rotary motor. .

FIG. 13 is a block diagram for explaining a configuration of a control circuit for controlling LED 81 and PSD 83. The illustrated control circuit controls the light emission timing of the LED 81 and calculates the currents I1 and I2 output from the PSD 83. The control circuit shown in FIG.
A ROM (Read Only Memory) 134 for storing programs and data, and a RAM (Ra
ndom Access Memory) 138, a timer 136 for controlling the light emission time interval, the interface driver 13
7, A / D converter 133 and LED driver 13
8 are connected by a bus.

An amplifier 1 is connected to the output terminals S1 and S2 of the PSD.
31, the analog operation circuit 132 is connected, and the PSD 83
And a circuit for calculating the currents I1 and I2 output from. The currents I1 and I2 output from the PSD 83 are input to the amplifier 131 and amplified to become current signals. This current signal is supplied to the analog operation circuit 132 by I2 /
The operation of (I1 + I2) is performed, and is further converted to a digital signal by the A / D converter 133, and the MPU 1
Passed to 35. Thereafter, the MPU 135 calculates the light receiving angle and the position coordinates of the pen.

The control circuit shown in FIG. 13 may be incorporated in the same housing as one of the light emission detecting devices 70a and 70b, or may be incorporated in a part of the coordinate input surface 1 as a separate housing. Also, the interface driver 137
It is preferable to provide an output terminal for outputting the calculated coordinate data to a personal computer or the like via the PC.

Next, the tip shape of the pen 145 which is the pointing means of the coordinate input / detection / display device of the third example will be described with reference to FIG. The pen 145 has a shape similar to a so-called writing instrument, and includes a retroreflective portion 140 that is a “light reflecting structure” at a tip B where light emitted by the light emission detection devices 70a and 70b passes. ing. The retroreflective member 445 is a member having a retroreflective structure that reflects the light emitted from the light emission detection devices 70a and 70b in the same direction as the incident direction. In the example shown in FIG. 14, a mirror member having a shape composed of many corner cubes is used as the retroreflective member.

The corner cube of the retroreflective member 445 is formed by combining three plane mirrors so as to be perpendicular to each other, as shown in FIG. In general, a portion surrounded by a thick line in a figure obtained by cutting one corner from a glass cube is used as a corner cube. In the corner cube configured as described above, the incident light is 1 on three surfaces.
After each reflection, the reflected light returns exactly in the direction of the incident light.

For example, a corner cube having a side length c of 2 mm is radially arranged at the tip of a pen 145 having a diameter of 10 mm. Further, as shown in FIG. 14, when the corner cubes adjacent to each other are arranged in the opposite direction, it is possible to form 62 corner cubes per stage.
In the case of a three-stage configuration as in the above, a total of 186 corner cubes can be configured. Although a structure using a corner cube as a structure in which reflected light returns in the direction of incident light has been described, other structures may be used as long as the structure has a recursive property in which reflected light returns in the direction of incident light. Good.

Next, the principle of detecting the position indicated by the pen 145 in the coordinate input / detection / display device of the present invention will be described. Here, a description will be given of a case where two light emission detection devices 70a and 70b are used as shown in FIG. 7, but the coordinates specified by the pen may be detected in the same manner even when a larger number of light emission detection devices are used. Is possible.

First, it is assumed that the operator has designated an appropriate position (X, Y) on the coordinate input surface 7 using the pen 145.
At this time, L of the light emitting unit 72b in the light emission detecting device 70b
It is assumed that, of the infrared light emitted from the ED 81, light emitted in the direction of the line segment p1 hits the pen 145. At this time,
The reflected light travels in the reverse direction along the line segment p1 to form the light-receiving angle detection unit 7
The light is received by the PSD 83 of 1b. Similarly, out of the infrared light emitted from the LED 81 of the light emitting section 72a of the light emission detecting device 70a, the light emitted in the direction of the line segment p2 hits the pen 145, and the reflected light travels in the same line segment p2 in the opposite direction. The light is received by the PSD 83 of the angle detector 71a.

The light received by the PSD 83 is
Spot light is formed at different positions on the light receiving surface of the PSD 83 depending on the incident angle with respect to the light. Here, the line segment p2 is
A line segment a2 that bisects the angle k2 of the coordinate input surface 1 forms an angle of θ2, and a line segment p1 forms an angle of θ1 from a line segment a1 that bisects the angle k1 of the coordinate input surface 1. I do.

FIGS. 16A and 16B are diagrams showing specific examples of the positional relationship between the coordinate input surface 1 and the cylindrical lens 82 and the PSD 83 forming the light receiving angle detecting means 71b. Here, the light receiving surface of the PSD 83 is the coordinate input surface 7.
Is perpendicular to a line segment a1 which forms an angle of 45 ° with the two sides of. That is, the center of the cylindrical lens 82 and the PSD 83
A line segment a1 connecting the center of the light receiving surface of the light receiving optical axis coincides with the light receiving optical axis and the light emitting optical axis. The distance between the center of the cylindrical lens 82 and the center of the light receiving surface of the PSD 83 is L, and P
The length of the light receiving surface of SD83 is 2L.

Now, it is assumed that the reflected light from the pen 145 passes through the line segment p1 and is received at a position D1 away from the central position of the PSD 83. The current values obtained from the two output terminals provided on the light receiving surface of the PSD 83 are I1,
Let it be I2. At this time, the following relationship is established between the currents I1 and I2 and the light receiving position of the PSD 83. I1 = I0 × (L−D1) / 2L Expression (8) I2 = I0 × (L + D1) / 2L Expression (9) where I0 = I1 + I2, therefore, L + D1 = 2L × I2 / (I1 + I2) Expression (10) )

That is, the light receiving position D1 of the reflected light is PS
It is obtained from the current values I1 and I2 obtained in D83. The above-described calculation is performed by the amplifier 131 and the analog calculation circuit 132 of the control circuit shown in FIG.

By the way, according to FIG. 16 (b), the following relationship is established: D1 / L = tan θ1 Expression (11) Therefore, the incident angle θ1 of the reflected light is
It is obtained from the following equation. θ1 = tan ⁻¹ (D1 / L) Equation (12) Similarly, the light-receiving angle detection unit 71 of the light emission detection device 70a
As for a, if the distance from the center of the PSD to the light receiving position is D2, the incident angle θ2 of the reflected light is given by the following equation.
Is required. θ2 = tan ⁻¹ (D2 / L) Equation (13)

Further, the pointing position (X, Y) of the pen 145
Is a line segment a formed by the incident angles θ1 and θ2 of the two reflected lights.
Since it is the intersection of 1, a2, the indicated position (X, Y) is obtained from θ1, θ2 from the following equation. Y = Xtan (45 ° −θ2) Expression (14) Y = (A−X) tan (45 ° −θ1) Expression (15) Here, as shown in FIG.
a, 70b (the horizontal length of the coordinate input surface 7).

By solving the above equations (14) and (15) as simultaneous equations, the position coordinates X and Y on the coordinate input surface 1 specified by the pen 145 are obtained. Note that (θ
Since (1, θ2) and (X, Y) are formulated, if these mathematical formulas are programmed and incorporated in the ROM 134, they can be easily obtained by the calculation of the MPU 135. The (X, Y) coordinate values, which are the calculation results, are transferred to a personal computer or the like via the interface driver 137, and can be used for processing such as displaying the position indicated by the pen and inputting a command corresponding to the indicated position.

In the example described above, the coordinate input / detection / display device of the third example has two light emission detection devices 70a, 70a.
The configuration having b is shown. However, the light emission detection device 70
If the LEDs 81 a and 70 b emit light at the same time, there is a possibility that infrared light from each other will be detected by the PSD 83 in the partner device.
The light emission control may be alternately performed in a time-division manner, and the current of the PSD 83 may be detected in synchronization with this.

For example, while one LED 81 emits light and the other LED 81 is turned off, the current of the PSD 83 corresponding to the one LED 81 is detected, and after 10 msec, the one LED 81 is turned off and the other LED 81 is turned off.
Is emitted, and the PS corresponding to the other LED 81 is
D83 current detection can be performed.

That is, one of the two LEDs 81 may be caused to emit light alternately every 10 msec. Such control is performed by the MPU 135 using the timer 1
36. By performing the time division control of the light emission of the LED 81 in this manner, erroneous detection of infrared light is also eliminated, and
The position can be detected by sufficiently following the movement of.

The coordinate input surface 7 only needs to be a flat shape whose position can be indicated by the pen 145, and is not particularly limited to the square shape as shown in the embodiment of FIG. 7, but may be another shape. Absent. Further, in the above-described example, it is assumed that a plane plate is used as the coordinate input surface 7, but the present invention is not limited to this, and a display device, for example, a display screen of a CRT display or an LCD display may be used.

When a CRT display or an LCD display is used, the infrared light L is used to eliminate the influence of display light being incident on the PSD 83 and being erroneously detected.
It is preferable to use an ED, and it is preferable to use an PSD that can detect the peak emission wavelength of the infrared light emitting LED as the PSD 83. Further, in order to prevent infrared rays generated from the CRT display or the LCD display from adversely affecting the coordinate detection, it is preferable to arrange an infrared cut filter made of a PVC resin or the like on the display screen.

Fourth Example FIG. 17 is a diagram for explaining a coordinate detection device according to a fourth example. The illustrated configuration includes an infrared position detecting unit 61 as an image input unit, a control unit 76, and a pen 64 as an instruction unit. Such a configuration is the coordinate input / detection / display device in the coordinate input / detection / display device of the fourth example, and configures the coordinate input / detection / display device by combining with the display device.

The infrared position detecting section 61 can take in substantially the entire area of the coordinate input range (coordinate input surface) 8 and has two infrared CCD cameras 62a and 62b arranged at an interval L. ing. An infrared LED 63 is provided at the tip of the pen 64. The fourth
In the example of the coordinate input / detection / display device, the coordinate input range 8
And a display device such as an LCD display or a CRT display. Alternatively, a signal representing coordinates may be output from the control unit 76 and displayed on a larger display device.

The control section 76 includes a reset signal circuit 60 for generating a reset signal a for resetting the infrared CCD cameras 62a and 62b,
a, a vertical clock circuit 65 for generating a vertical clock signal b for vertical scanning of 62b, an infrared CCD camera 6
2a, horizontal clock signal c for horizontal scanning of 62b
Is generated. In addition,
The reset signal a, the vertical clock signal b, and the horizontal clock signal c are input to the infrared CCD cameras 62a and 62b,
This signal causes the infrared CCD cameras 62a and 62b to start scanning in the X and Y directions.

The control unit 76 is provided with an infrared CC
Video signals d1, d2 output by the D cameras 62a, 62b
, Peak detecting circuits 67a and 67b for outputting peak detection signals e1 and e2, an arithmetic circuit 68 for calculating coordinates inputted by the pen 64, and outputting the coordinates calculated by the arithmetic circuit to an external device. And an display circuit 75 for displaying. Further, the illustrated coordinate detection device includes an audio circuit unit (not shown) that generates a warning sound or the like when the pen 64 inputs coordinates outside the image capturing range of the infrared detection unit 61 to further improve operability. Can be.

Further, the coordinate detecting device shown in the figure is provided with a lens magnification adjusting circuit or a focal length adjusting circuit in the infrared CCD cameras 62a and 62b, so that the coordinate input surface 8 can be adjusted.
Infrared CC according to the size of the
The resolution and detection range of the D cameras 62a and 62b can be set. In the configuration shown in FIG.
Although the infrared ray detector 6 and the infrared ray detector 61 are provided separately, it is also possible to integrate the two by reducing the size of each circuit incorporated in the controller 76.

FIG. 18 is a timing chart for explaining the processing of each signal performed by the coordinate input device shown in FIG. The reset signal a, the vertical clock signal b, and the horizontal clock signal c are simultaneously input to the infrared CCD cameras 62a and 62b at the illustrated timings.
By receiving the reset signal a, the vertical clock signal b, and the horizontal clock signal c, the infrared position detecting unit 61
Video signal d output from CD cameras 62a and 62b
1 and d2 are input to the control unit 76.

The image signals d1 and d2 are signals representing images obtained by photographing the pen 64 with the infrared CCD cameras 62a and 62b. At this time, the infrared CCD cameras 62a, 62b
, The infrared CCD cameras 62a and 62b show only the infrared LED 63, and the other portions capture black images. Therefore, strong peak signals p1 and p2 corresponding to the position of the infrared LED 63 appear in the video signals d1 and d2 output from the infrared CCD cameras 62a and 62b.

The peak detection circuits 67a and 67b detect the peak signals p1 and p2 and output the peak detection signals e1 and e2 having the peak signals q1 and q2. The peak detection signals e1 and e2 are sent to the arithmetic circuit 68. The arithmetic circuit 68 has a built-in ROM (not shown). The ROM converts the peak signals q1 and q2 appearing in the peak detection signals e1 and e2 into angle data representing the position of the infrared LED 63 as an angle. A table is stored.

Note that this angle data is stored in the infrared LED 6
For the position of No. 3, a straight line connecting the position of the infrared LED 63 and the reference point (for example, the origin of the infrared CCD cameras 62a and 62b) on the coordinate input surface 8 is specified.
The upper reference line (for example, infrared CCD cameras 62a, 62b
Infrared LED6 at an angle between the line and the line connecting the origins
3 represents the position.

The arithmetic circuit 68 converts the peak detection signals e1 and e2 into angles as described above, and specifies two angles. And further, the infrared CCD camera 62
Using the distance L between a and 62b, the position where the infrared LED 63 is placed, that is, the coordinates input by the pen 64 is calculated. The coordinates thus obtained are output to an external display device via the interface circuit 69 or output to the display circuit 75 for display.

Next, a method for detecting coordinates input from angle data will be described in detail with reference to FIG. In addition,
FIG. 19 shows the coordinates (x, y) input by the pen 64 in two-dimensional coordinates with one origin (lower left corner of the photographing range in the drawing) of the infrared CCD cameras 62a and 62b as the origin (0, 0). Things.

The arithmetic circuit 68 calculates the peak detection signals e1 and e
2 is detected, and from the relationship between the peak signals q1 and q2 appearing here and the vertical clock signal b and the horizontal clock signal c based on the reset signal a, the infrared CCD camera 62a
Coordinates of the pen 64 using coordinates with the origin of the
1, y1) and the coordinates (x2, y2) of the pen 64 using the coordinates with the origin of the infrared CCD camera 62b as the origin. Then, the coordinates (x1, y1) and the coordinates (x
Using the coordinates shown in FIG. 19 and the positions of the pen 64 as viewed from the infrared CCD cameras 62a and 62b by the angles θ _L and θ _R using (2, y2), the following results are obtained. θ _L = tan ⁻¹ (y1 / x1) Equation (16) θ _R = tan ⁻¹ (y2 / x2) Equation (17)

Next, the angles θ _L and θ _R are obtained from the above equations (16) and (17).
Using the distance L between a and 62b, the coordinates (x, y) input by the pen 64 represented by the coordinates shown in FIG. 8 can be obtained by the following equation. y = xtan θ _L Expression (18) y = (xl) tan (π-θ _R ) Expression (19)

If x and y are obtained by using the above equations (18) and (19) as simultaneous linear equations, the coordinates (x, y) inputted by the pen 64 can be calculated. The arithmetic circuit 68 described above
The conversion table of (x1, y1), (x2, y)
This is stored in association with 2). Further, the coordinate detection device of the second example does not require a tablet board or the like to be placed on a workbench, and can effectively use a work space.

Further, even when a document or the like is overlaid on the coordinate input surface 8, it is possible to input coordinates to the coordinate input device. Furthermore, since the image capturing range of the infrared CCD cameras 62a and 62b can be variably set by the lens magnification modulation circuit section and the resolution can be set at the same time, the operability and convenience of the coordinate input device can be improved.

Next, Embodiments 1 to 4 of the present invention will be described. In addition, Embodiment 1 of this invention described below.
4 may be configured as any of the coordinate input / detection / display device of the first example described above or the coordinate input / detection / display device of the fourth example. In the description of the first to fourth embodiments of the present invention, for the sake of simplicity, the configuration of input coordinates is omitted from the drawings and description.

(Embodiment 1) FIG. 20 shows Embodiment 1 of the present invention.
FIG. 2 is a top view for explaining the appearance of the coordinate input / detection / display device. FIG. 21 is a block diagram for explaining processing performed by the coordinate input / detection / display device according to the first embodiment.

The illustrated coordinate input / detection / display device has a panel 20 which is a coordinate input surface on which coordinates (point P) are input by a pen 22 which is an instruction means, and a coordinate input for detecting the input coordinates. A coordinate input / detection / display device having a detection device and a display device for displaying information based on the coordinates input to the coordinate input / detection device. In the first to fourth embodiments of the present invention, for example, an LCD display is used as the panel 20, and a coordinate input / detection / display device is configured in combination with the coordinate input / detection device described above.

Further, the configuration shown in FIG.
A light emitting diode 11 that emits light having a predetermined width in a direction parallel to the panel 20 and perpendicular to the panel 20; and a light receiving unit that receives light emitted by the light emitting diode 11. Phototransistor 12
A display device 16 for displaying a display element (pointing to all elements that can be displayed on the panel 20) including a coordinate indicating element (a cursor, a pointer, and the like) on the panel 20; And a display control circuit 14 which is a display control means for controlling the display control circuit 16.

The light emitting diode 11 of the first embodiment includes a plurality of light emitting diodes 110 provided in the length direction of two sides around the panel 20. In addition, the phototransistor 12 includes a plurality of phototransistors 120 provided in the length direction of two sides of the periphery of the panel 20 facing the side on which the light emitting diodes 11 are provided. The light emitting diode 11 emits light substantially parallel to the panel 20, and this light is
Is received at. In the embodiment of the present invention, light emitted from the light emitting diode 11 is a visible light.

Further, in the first embodiment, the display control circuit 14 and the display device 16 are not integrally formed with the panel 20 as shown in FIG. 20, but may be formed separately. good. The display control circuit 14 according to the first embodiment includes a logic circuit (not shown) for processing a light receiving signal output from the phototransistor 12, and a storage device such as a ROM for storing an operation program of the logic circuit. Shall be performed.

As shown in FIG. 21, the light emitting diode 1
The light emitted by 1 is received by the phototransistor 12. The phototransistor 12 converts the received light into an electric signal (light reception signal) in accordance with the amount of light, and outputs the electric signal to the display control circuit 14. The display control circuit 14 outputs a control signal to the display device 16 based on the light receiving signal input from the phototransistor 12.

The display device 16 is a device that displays, deletes, and moves a display element including a coordinate indicating element such as a cursor and a pointer displayed on a panel 20 which is an LCD display. The display device 16 can display, delete, and move the coordinate indicating element and the like according to the light receiving state of the phototransistor 12 by displaying the coordinate indicating element based on the control signal.

At this time, according to the first embodiment of the present invention, the display control circuit 14 is configured such that the phototransistors 120 that have not output the light receiving signal are arranged in the horizontal direction.
Specify each of those arranged in the vertical direction. Then, the coordinates of the point P input by the pen 22 are obtained as the intersection of two straight lines perpendicular to the light receiving surface of the phototransistor 120 specified in each arrangement direction, and this information is added to the control signal. I do. The display device 16 may recognize the input coordinates (point P) from the information included in the control signal and perform processing to display a coordinate pointing element at this point P.

Next, the light receiving signal generated by the phototransistor 12 and the display control circuit 14 will be described with reference to FIG.
The relationship between the control signal generated by the display device 16 and the processing by the display device 16 will be described. FIG. 22 is a cross-sectional view of panel 20 along the broken line AA ′ shown in FIG.

As shown, the light L emitted from the light emitting diode 11 has an optical axis substantially parallel to the surface of the panel 20 and has a predetermined width (hereinafter simply referred to as a width) in a direction perpendicular to the panel 20. ) Toward the phototransistor 12 and is received by the phototransistor 12. The phototransistor 12 is turned on and off according to the amount of received light, and generates a received light signal.

At this time, when the pen 22 approaches the panel 20 to specify a point P on the panel 20, the pen 2
A part or all of the light L is blocked by 2. When all of the light L is blocked by the pen 22, the light L is not received by the phototransistor 12 as a matter of course, and the light receiving signal output to the display control circuit 14 becomes zero. Also,
When a part of the light L is blocked by the pen 22, a light receiving signal 1 or 0 is generated according to the light amount (intensity) of the light L reaching the phototransistor 12, and the display control circuit 14
Is output to

The display control circuit 14 processes the input light receiving signal 1 or 0 by a logic circuit according to a program stored in the ROM, determines whether or not to display the coordinate pointing element, and generates a control signal. . The display device 16 displays, deletes, or displays the coordinate pointing element based on the control signal.
Moving. Therefore, in the coordinate input / detection / display device of the present invention, the design of the threshold value at which the phototransistor 12 outputs the light receiving signal 1, the operation circuit of the display control circuit 14, and the RO
By setting the program stored in M, a pointer or the like can be displayed or erased at a desired intensity of the light L, that is, a desired position (height) of the pen 22 in the vertical direction with respect to the panel 20.

Further, in the configuration shown in FIG. 22, the optical path of the light L is designed to have a predetermined distance from the surface of the panel 20. According to such a configuration, the light emitting diode 1
1. Even when the light emitting and receiving areas of the phototransistor 12 are relatively small, the pen 22 is relatively far from the panel 20, that is, the coordinate indicating element can be displayed from an early stage of the input operation.

In the coordinate input / detection / display device of the first embodiment, the operator can clearly recognize that the coordinate input operation has started relatively early, and furthermore, the input by the pen 22 is performed. Since the coordinates of the
It is possible to reduce the difference between the coordinates to be input and the coordinates actually input (erroneous input).

Further, in the first embodiment, it can be determined that the coordinate input is normally performed while the coordinate indicating element is displayed. For this reason, the input situation of coordinates becomes easy to recognize, and erroneous input can be reduced more effectively. Then, the operator can easily recognize the coordinates actually input even during the input, so that the erroneous input can be more effectively reduced.

Further, Embodiment 1 is not limited to the configuration shown in FIG. Next, another configuration example of the coordinate input / detection / display device according to the first embodiment will be described.

FIG. 23 is a diagram exemplifying another configuration of the coordinate input / detection / display device according to the first embodiment. Similar to FIG. 22 described above, a broken line AA ′ in FIG. FIG. The coordinate input / detection / display device shown in FIG. 23 is configured such that the optical path of light represented by the optical axis L emitted from the light emitting diode 11 is in contact with the surface of the panel 20.

According to such a configuration, even when the light emitting and receiving areas of the light emitting diode 11 and the phototransistor 12 are relatively small, the pen 22 and the panel 20 are relatively close to each other. At the stage of execution, a coordinate indicating element can be displayed. Therefore, the difference between the timing at which the coordinate indicating element appears and the timing at which the coordinate input is executed is reduced, and the timing of the coordinate input can be recognized with higher accuracy. And erroneous input can be reduced.

Next, Embodiment 1 having the above-described configuration will be described.
An example of the processing performed by the coordinate input / detection device of FIG. Note that in the flowchart shown in FIG.
When the phototransistor 12 is set to output a light receiving signal (switch the signal output from 1 to 0 or from 0 to 1) when the phototransistor 12 is at the position shown in FIG. Is what is done.

In the flowchart shown in FIG. 24, after the processing is started, when the pen 22 approaches the panel 20 and blocks an optical path in a predetermined area, a setting is made so that a light receiving signal is output. The display control circuit 14 determines whether or not a light receiving signal is input (S1). When the light receiving signal is input (Yes at Step S1), the display controlling circuit 14 counts the light receiving signal (Step S2).
If no light receiving signal is input, the process waits until a light receiving signal is input (No at step S1).

At this time, in the first embodiment, step S
If the count value of the light receiving signal counted in 2 is 1 (first light receiving signal), it is determined that the signal is an input start signal (Yes at step S3). Then, a control signal is output to the coordinate display device, and the coordinate display element is processed so as to be displayed (step S4).
Return to 1. If it is determined in step S3 that the input signal is not the first input signal, that is, it is not the input start signal, the process proceeds to step S5 without displaying the coordinate pointing element (step S3 negative).

In step S5, when the count value of the light receiving signal is 2 (the second input signal), it is determined that the signal is an input end signal (Yes in step S5).
Then, a control signal is output to the display device 16 to delete the coordinate pointing element (step S6). Then, the count of the light receiving signal is reset (step S7). Also,
If it is determined in step S5 that the input signal is not the second input signal, it is determined that there is an error, and the process returns to step S1 (No in step S5).

With the above arrangement, both the start and the end of the input operation are detected by the phototransistor 12 and the display control circuit 14, and the coordinate indicating element is displayed on the panel 20, or the displayed coordinate indicating element is displayed. Elements can be erased.

The display control circuit 14 includes a display device 16
Is configured to control only the processing for displaying or deleting the coordinate pointing element according to the position of the pen 22. Therefore, the processing described with reference to FIG.
Reference numeral 6 describes only a process for displaying or deleting the coordinate indicating element according to the position of the pen 22. The process of moving the displayed coordinate indicating element with the movement of the pen 22 is performed by another configuration based on another flowchart.

In such a process, for example, the coordinates detected from the coordinate input / detection configuration of the first to fourth examples described above are input to the display device 16 and the display device 1
6 can also be realized by processing to move the display position of the coordinate pointing element based on the coordinates. When the display of the coordinate indicating element is started, as described above, the coordinates input by the pen 22 are obtained from the position of the phototransistor 120 where the light to be received by the pen 22 is blocked. Elements may be displayed.

According to the coordinate input / detection / display device of the first embodiment described above, when the operator inputs coordinates to the panel 20, the pointer or the cursor such as a pointer or a cursor is displayed on the panel 20 in accordance with the height of the pen 22. A coordinate pointing element can be displayed. Therefore, the operator can clearly grasp the operation timing such as the start and end of the coordinate input.

If the display position of the coordinate indicating element is determined according to the position of the pen 22 at the start of input,
The position on the panel 20 where the pen 22 is lowered can also be adjusted, so that characters and commands can be more appropriately input to the panel 20.
Therefore, the coordinate input / detection / display device according to the first embodiment can provide a coordinate input / detection / display device with less erroneous input by an operator, and can use a coordinate input / detection / display device such as an office to display characters and graphics. In meetings, presentations, and the like in which the user inputs and displays the information, the work can be smoothly performed to facilitate the proceedings of the proceedings.

Further, the first embodiment described above mainly describes displaying coordinate pointing elements such as a pointer and a cursor. However, the present invention is not limited to such an example, and display control may be performed according to the height of the pen 22 including display elements other than the coordinate indicating element.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described. FIG. 25 is a cross-sectional view for explaining Embodiment 2 of the present invention. The top surface of the coordinate input / detection / display device according to the second embodiment is not shown because it has the same appearance as that of FIG. 20 described above. The cross-sectional view of FIG. 25 is a cross-sectional view along the arrow line AA ′ shown in FIG. 20, as in FIGS.

The coordinate input / detection / display device according to the second embodiment changes the display state of the coordinate pointing element according to the size and shape of the pen 22, as shown in FIG. Such a change is recognized by, for example, the size and shape of the pen 22 from the number and arrangement of the phototransistors 120 that do not output a light receiving signal among the phototransistors 12. Then, this information is added to a control signal output from the display control circuit 14 and input to the display device 16. Further, it can be realized by setting the display device 16 so as to change the dimensional shape and properties of the coordinate pointing element according to the information added to the control device.

In the second embodiment, for example, if the size of the tip of the pen 22 is large, a large pointer is displayed, and if it is small, a small pointer is displayed. Is relatively small, it is possible to reduce erroneous operations such as erroneously inputting coordinates to a nearby input basin. Therefore, the coordinate input / detection / display device according to the second embodiment can smoothly carry out its work even in a conference or a presentation where the characters and graphics are input and displayed using the coordinate input / detection / display device in an office or the like. Can facilitate the proceedings.

(Third Embodiment) Next, a third embodiment of the present invention will be described. FIG. 26 is a top view for explaining the appearance of the coordinate input / detection / display device according to the third embodiment. FIG. 27 is a cross-sectional view of the configuration shown in FIG. 26, taken along the line AA '. FIG. 28 is a block diagram for explaining processing performed by the coordinate input / detection / display device according to the third embodiment. In addition, among the configurations shown in such drawings, the same components as those shown in FIGS. 20 to 23 described above are denoted by the same reference numerals, and the description thereof will be partially omitted.

The coordinate input / detection / display device according to the third embodiment includes a panel 20 using an LCD display, a light emitting diode 11, a phototransistor 33, and a panel 2.
Display device 1 that displays a display element including a coordinate indicating element at 0
6 and a display control circuit 1 serving as display control means for controlling the display device 16 in accordance with the light receiving state of the phototransistor 12.
And 4. As shown in FIG. 27, the coordinate input / detection / display device according to the third embodiment includes the phototransistors 33a,
33b is provided in plurality.

That is, the light emitting diode 11 of the third embodiment is similar to the first and second embodiments in that the
The light emitting diode 110 is provided with a plurality of light emitting diodes 110 in the length direction of two sides in the vicinity of 0. However, the phototransistor 33 includes a phototransistor 33a provided on a side of the periphery of the panel 20 opposite to the side on which the light emitting diode 11 is provided, and a phototransistor 33a.
Closer to the panel 20 and the phototransistor 33
a and a phototransistor 33b provided in parallel. Note that the phototransistors 33a and 33b
Also includes a plurality of phototransistors 330 provided in the length direction of the side.

In the coordinate input / detection / display device of the third embodiment configured as described above, as shown in FIG. 28, the phototransistors 33a and 33b
Respectively generate light receiving signals independently and display control circuit 1
4 is output. For this reason, the display control circuit 14 can independently process the light reception signal generated by the phototransistor 33a and the light reception signal generated by the phototransistor 33b.

Therefore, in the coordinate input / detection / display device according to the third embodiment, for example, the phototransistor 33a
Can be used to control the display of separate display elements (for example, a coordinate indicating element and a coordinate indicating element other than the coordinate indicating element).

According to such a configuration, for example, when the display control circuit 14 receives no light receiving signal from any of the phototransistors 33a and 33b, the panel 2
Nothing is displayed at 0. When a light receiving signal is input from the phototransistor 33a, a display element other than the coordinate indicating element is displayed, and when a light receiving signal is also input from the phototransistor 33b, the coordinate indicating element is displayed.

Further, the third embodiment is not limited to the configuration shown in FIGS. Next, another configuration example of the coordinate input / detection / display device according to the third embodiment will be described.

FIG. 29 is a diagram illustrating another configuration of the coordinate input / detection / display device according to the third embodiment. Similar to FIG. 27 described above, a broken line AA ′ in FIG. FIG. The coordinate input / detection / display device shown in FIG. 29 is provided such that at least one of the plurality of phototransistors 34a and 34b is in contact with an adjacent phototransistor.

The coordinate input / detection / display device shown in FIG. 29 has the effect obtained by the coordinate input / detection / display device shown in FIG. In addition, there is an effect that the light reception signal generated by the phototransistor 34a and the light reception signal generated by the phototransistor 34b can be used for controlling display of separate display elements.

FIG. 30 is a diagram illustrating still another configuration of the coordinate input / detection / display device according to the third embodiment. As in FIG. 29 described above, a broken line A- in FIG.
It is sectional drawing which follows A '. The coordinate input / detection / display device shown in FIG.
5b, at least one phototransistor is
It is provided at a predetermined distance from an adjacent phototransistor.

The coordinate input / detection / display device shown in FIG. 30 has the same effect as the coordinate input / detection / display device shown in FIG.
Operation and the pen 2 which is relatively far from the panel 20
There is an effect that the display element can be displayed or erased in accordance with both of the operations (2) and (3).

FIG. 31 is a diagram exemplifying still another configuration of the coordinate input / detection / display device according to the third embodiment. Similar to FIGS. 29 and 30 described above, broken lines in FIG. It is sectional drawing which follows AA '. The coordinate input / detection / display device shown in FIG.
The display control circuit 14 controls the display device 16 based on a light receiving signal generated by at least two phototransistors (for example, the phototransistor 36a and the phototransistor 36c) among 6a, 36b, and 36c.

In the configuration of the third embodiment, for example, the pen 22 is set to (x
1, x2) (phototransistor 3
6a), the pen 22 is determined by the phototransistor 36b to be at the coordinates (y1, y2) (the position of the phototransistor forming the phototransistor 36b). Judgment is made from the position of the phototransistor that has not received light), and (x1, x2),
The points indicated by (y1, y2) are a
1, a2 (phototransistors 36a, 36
If b is on or off, the position indicated by the pen 22 is represented by coordinates (-a2.x2 / (a1-a2) + a1).
X2 / (a1-a2), -a2 / y2 / (a1-a2) + a1
• It is detected as y2 / (a1-a2)).

Therefore, the coordinate input / detection / display device shown in FIG. 31 has the effect obtained by the coordinate input / detection / display device shown in FIG. Also in this case, there is an effect that the input coordinates are detected in consideration of this inclination, and a pointer or a cursor can be displayed at this position.

According to the coordinate input / detection / display device of the third embodiment described above, the position and state of the pen 22 with respect to the panel 20 are detected in more detail, and a finer display element is displayed in accordance with the detected information. Control becomes possible. In addition, pen 2
The coordinates input by the pen 22 can also be detected in consideration of the inclination of 2. The coordinate input / detection / display device according to the third embodiment is used for inputting / coordinates of an office or the like.
Even in meetings and presentations in which characters and graphics are input and displayed using the detection / display device, the work can be performed smoothly and the proceedings can be performed smoothly.

(Embodiment 4) Next, Embodiment 3 of the present invention will be described. FIG. 32 is a top view of the coordinate input / detection / display device according to the fourth embodiment. FIG.
FIG. 33 is a cross-sectional view of the configuration shown in FIG. 32, taken along the line AA ′. In addition, among the configurations shown in such drawings, the same components as those shown in FIGS. 20 to 23 described above are denoted by the same reference numerals, and the description thereof will be partially omitted.

The coordinate input / detection / display device according to the fourth embodiment includes a panel 20 using an LCD display, a light emitting diode 11, a phototransistor 12, and a panel 2.
Display device 1 that displays a display element including a coordinate indicating element at 0
6 and a display control circuit 1 serving as display control means for controlling the display device 16 in accordance with the light receiving state of the phototransistor 12.
And 4. Then, the phototransistor 12
Has a light shielding plate 45 which is disturbance light eliminating means for eliminating disturbance light other than the light emitted from the light emitting diode 11.

That is, the phototransistor 12 of the fourth embodiment is provided with a light shielding plate 45 parallel to the panel 20 at the upper end and the lower end. In the coordinate input / detection / display device according to the fourth embodiment configured as described above, light other than light parallel to the light receiving surface of the phototransistor 12 is not received. Therefore, it is possible to prevent light (disturbance light) other than light parallel to the panel 20 emitted from the light emitting diode 11 from entering the phototransistor 12. As the disturbance light eliminating means, a polarizing plate may be used in addition to the shielding plate 45.

According to the coordinate input / detection / display device of the fourth embodiment, the phototransistor 12 becomes resistant to disturbance light, and the position of the pen 22 is reliably detected to enable the coordinate input / detection / display device. Reliability can be improved. The coordinate input / detection / display device according to the fourth embodiment facilitates the work in a conference, a presentation, and the like in which characters and graphics are input and displayed using the coordinate input / detection / display device in an office or the like. To facilitate the proceedings.

The present invention is not limited to the embodiment described above. That is, when the present invention is applied to the coordinate input / detection / display device of the second example, the light-emitting means and light-receiving means for coordinate detection and the light-emitting means and light-receiving means for display control are shared. May be.

[0163]

The present invention described above has the following effects. In other words, according to the first aspect of the present invention, a display element including a coordinate indicating element can be displayed on the display device in accordance with the state of the indicating means, and characters and commands can be displayed. It is possible to provide a coordinate input / detection / display device that can perform coordinate input appropriately and has few erroneous inputs.

According to the second aspect of the present invention, the coordinate input / detection / display device of the present invention can be constituted by using the coordinate input / detection device of the optical system.
Further, it is possible to provide a coordinate input / detection / display device with less erroneous input.

According to the third aspect of the present invention, the coordinate input / detection / display device of the present invention can be constituted by using the coordinate input / detection device of the optical system.
Further, it is possible to provide a coordinate input / detection / display device with less erroneous input.

According to the fourth aspect of the present invention, a display element including a coordinate indicating element can be displayed on the display device immediately before the input operation by the indicating means is executed, and the coordinate input / detection / display with less erroneous input. An apparatus can be provided.

According to a fifth aspect of the present invention, there is provided a coordinate input / detection / display device capable of displaying a display element including a coordinate instruction element on a display device at an early stage of an input operation by an instruction means, and having less erroneous input. Can be provided. Become so.

According to the sixth aspect of the present invention, it is possible to provide a coordinate input / detection / display device in which the range of coordinates indicated by the indicating means can be easily recognized and erroneous inputs are reduced. You.

According to the seventh aspect of the present invention, since a plurality of types of control can be performed based on an input operation by the instruction means, more detailed processing can be performed in accordance with the operation state of the instruction means. Coordinate input with less erroneous input
A detection / display device can be provided.

According to the eighth aspect of the present invention, since a plurality of types of control can be performed based on the input operation by the instruction means, more detailed processing can be performed in accordance with the operation state of the instruction means. A coordinate input / detection / display device with less erroneous input even when the width of light emitted from the light emitting means is narrow can be provided.

According to the ninth aspect of the present invention, a plurality of types of control can be performed immediately before input by the instruction means and at a relatively early stage of the input. Thus, a coordinate input / detection / display device with less erroneous input can be provided.

According to the tenth aspect of the present invention, the state (inclination, etc.) of the pointing means can be detected in more detail, finer processing can be performed according to the operating state of the pointing means, and erroneous input is further reduced. A coordinate input / detection / display device can be provided.

According to the eleventh aspect, the shielding state of the light emitted from the light emitting means can be stably reflected by the light receiving state of the light receiving means, and the reliability of the light receiving means can be further improved.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a coordinate input / detection / display device of a first example applied to the present invention.

FIG. 2 is another diagram for explaining the coordinate input / detection / display device of the first example applied to the present invention.

FIG. 3 is another diagram for explaining the coordinate input / detection / display device of the first example applied to the present invention.

FIG. 4 is another diagram for explaining the coordinate input / detection / display device of the first example applied to the present invention.

FIG. 5 is another diagram for explaining the coordinate input / detection / display device of the first example applied to the present invention.

FIG. 6 is a diagram for explaining a coordinate input / detection / display device of a second example applied to the present invention.

FIG. 7 is a diagram for explaining a coordinate input / detection / display device of a third example applied to the present invention.

FIG. 8 is another diagram for explaining a coordinate input / detection / display device of a third example applied to the present invention.

FIG. 9 is another diagram for explaining a coordinate input / detection / display device of a third example applied to the present invention.

FIG. 10 is another diagram for explaining a coordinate input / detection / display device of a third example applied to the present invention.

FIG. 11 is another diagram for explaining a coordinate input / detection / display device of a third example applied to the present invention.

FIG. 12 is another diagram for explaining a coordinate input / detection / display device of a third example applied to the present invention.

FIG. 13 is another diagram for explaining a coordinate input / detection / display device of a third example applied to the present invention.

FIG. 14 is another diagram for explaining a coordinate input / detection / display device of a third example applied to the present invention.

FIG. 15 is another diagram for explaining a coordinate input / detection / display device of a third example applied to the present invention.

FIG. 16 is another diagram for explaining a coordinate input / detection / display device of a third example applied to the present invention.

FIG. 17 is a view for explaining a coordinate input / detection / display device of a fourth example applied to the present invention.

FIG. 18 is another diagram for explaining the coordinate input / detection / display device of the fourth example applied to the present invention.

FIG. 19 is another diagram for explaining a coordinate input / detection / display device of a fourth example applied to the present invention.

FIG. 20 is a top view illustrating the configuration of the first embodiment of the present invention.

FIG. 21 is a block diagram for describing a configuration according to the first embodiment of the present invention.

FIG. 22 is a cross-sectional view for describing the configuration of the first embodiment of the present invention.

FIG. 23 is another sectional view for describing the configuration of the first embodiment of the present invention.

FIG. 24 is a flowchart illustrating a configuration of the first embodiment of the present invention.

FIG. 25 is a cross-sectional view for describing a configuration according to the second embodiment of the present invention.

FIG. 26 is a top view for describing the configuration of the third embodiment of the present invention.

FIG. 27 is a sectional view for illustrating the configuration of the third embodiment of the present invention.

FIG. 28 is a block diagram illustrating a configuration according to a third embodiment of the present invention.

FIG. 29 is another sectional view for illustrating the configuration of the third embodiment of the present invention.

FIG. 30 is another cross-sectional view for describing the configuration of the third embodiment of the present invention.

FIG. 31 is another sectional view for describing the configuration of the third embodiment of the present invention.

FIG. 32 is a top view illustrating the configuration of the fourth embodiment of the present invention.

FIG. 33 is a sectional view for illustrating the configuration of the fourth embodiment of the present invention.

[Explanation of symbols]

6, 7, 8, 43 Coordinate input surface 11, Light emitting diode 12, 33a, 33b, 34a, 34b, 35a, 35
b, 36a, 36b, 36c Phototransistor 14 Display control circuit 16 Display device 20 Panel 22 Pen 42a, 42b Light receiving / emitting section 44 Retroreflective member 45, Light shielding plate 70a, 70b Light emission detecting device

Claims (11)

[Claims] 1. A coordinate input / detection device that has a coordinate input surface on which coordinates are input by an instruction means and detects the input coordinates, and displays information based on the coordinates input to the coordinate input / detection device. A light emitting unit that emits light having a predetermined width in a direction parallel to the coordinate input surface and perpendicular to the coordinate input surface. Light receiving means for receiving light emitted by the light emitting means; display means for displaying a display element including a coordinate indicating element on the display device; and display for controlling the display means according to a light receiving state of the light receiving means. Coordinate input, characterized by having control means
Detection and display device. 2. The coordinate input / detection device has a plurality of coordinate detecting light emitting units and a plurality of coordinate detecting light receiving units.
2. The coordinate input / detection / display device according to claim 1, wherein the coordinates of said pointing means for blocking an optical path between said coordinate detecting light emitting means and said coordinate detecting light receiving means are detected. 3. The coordinate input / detection device has image input means for inputting an image on the coordinate input surface, and calculates coordinates of the pointing means from an image of the pointing means input by the image input means. 2. The method according to claim 1, wherein the detecting is performed.
The described coordinate input, detection and display device. 4. The light source according to claim 1, wherein light emitted from said light emitting means and having a predetermined width in a direction perpendicular to said coordinate input surface has an optical path in contact with said coordinate input surface. A coordinate input / detection / display device according to any one of the above. 5. The light emitted from the light emitting means and having a predetermined width in a direction perpendicular to the coordinate input surface has an optical path having a predetermined distance from the coordinate input surface. The coordinate input / detection / display device according to claim 1. 6. The coordinate input device according to claim 1, wherein said display control means changes a display state of said coordinate indicating element according to a size and a shape of said indicating means.・ Detection / display device. 7. The coordinate input / detection / display device according to claim 1, wherein a plurality of said light receiving means are provided in a direction perpendicular to said coordinate input surface. 8. The coordinate input / detection / display device according to claim 7, wherein at least one of the plurality of light receiving means is provided so as to contact an adjacent light receiving means. . 9. The light receiving device according to claim 7, wherein at least one of the plurality of light receiving devices is provided at a predetermined distance from an adjacent light receiving device.
The coordinate input / detection / display device described in 1. 10. The display control unit according to claim 7, wherein the display control unit controls the display unit according to a light receiving state of at least two of the plurality of light receiving units.
10. The coordinate input / detection / display device according to any one of items 9 to 9. 11. The coordinate input device according to claim 1, wherein said light receiving means has disturbance light eliminating means for eliminating disturbance light other than light emitted by said light emitting means.・ Detection and display device.