JP2011257336A - Optical position detection device, electronic apparatus and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical position detection device, an electronic apparatus and a display device that are capable of efficiently detecting the position of an object in accordance with the location thereof.SOLUTION: The optical position detection device includes: a light emission part EU for emitting irradiation light LT to a detection area RDET that is set along the X-Y plane; a light reception part RU for receiving reflection light LR that derives from the irradiation light LT being reflected on an object OB in the detection area RDET; and a detection part 50 for detecting position information of the object OB on the basis of the reception result of the light reception part RU. The light emission part EU emits irradiation light LT with a first intensity distribution pattern PID1 and irradiation light LT with a second intensity distribution pattern PID2 when determining that the distance of the object OB from an object surface 20 on which the detection area RDET is set is short, and emits irradiation light LT with a third intensity distribution pattern PID3 when determining that the distance of the object OB from the object surface 20 is long.

Description

  The present invention relates to an optical position detection device, an electronic apparatus, a display device, and the like.

  In recent years, electronic devices such as mobile phones, personal computers, car navigation devices, ticket vending machines, and bank terminals have used display devices with a position detection function in which a touch panel is arranged on the front surface of a display unit. According to this display device, the user can point to an icon of a display image or input information while referring to an image displayed on the display unit. As a position detection method using such a touch panel, for example, a resistance film method or a capacitance method is known.

  On the other hand, projection display devices (projectors) and display devices for digital signage have a larger display area than display devices for mobile phones and personal computers. Therefore, in these display devices, it is difficult to realize position detection using the above-described resistive film type or capacitive type touch panel.

  As a conventional technique of a position detection device for a projection display apparatus, for example, a technique disclosed in Patent Document 1 is known. However, this position detection device has a problem that the power consumption increases when the detection area is wide.

  As a technique for reducing the power consumption of the position detection device, for example, a technique disclosed in Patent Document 2 is known. However, this method is intended to reduce the power consumption by increasing the detection pause time when the object is not detected, and it is difficult to perform efficient position detection according to the position of the object.

JP 2001-142463 A JP 2001-82923 A

  According to some aspects of the present invention, it is possible to provide an optical position detection device, an electronic device, a display device, and the like that can efficiently detect a position according to the position of an object.

  In one embodiment of the present invention, a light emitting unit that emits irradiation light to a detection area that is set along an XY plane, and light reflected by the irradiation light reflected on an object in the detection area are received. A light receiving unit; and a detection unit that detects position information of the object based on a light reception result of the light receiving unit, wherein the light emitting unit is a distance of the object from a target surface that sets the detection area Is determined to be short, the irradiation light of the first intensity distribution pattern and the irradiation light of the second intensity distribution pattern are emitted, and it is determined that the distance of the object from the target surface is long. If so, the present invention relates to an optical position detection device that emits the irradiation light of the third intensity distribution pattern.

  According to one aspect of the present invention, the intensity distribution pattern of the irradiation light can be switched according to the distance from the target surface of the target object. For example, when the target object is close to the target surface, It is possible to ensure high detection accuracy using the irradiation light, while reducing the power consumption using the irradiation light of one intensity distribution pattern when the object is far from the target surface. As a result, an efficient optical position detection device can be realized according to the position of the object.

  In the aspect of the invention, the light emitting unit may emit the irradiation light of the first intensity distribution pattern in the first period when it is determined that the distance of the object from the target surface is short. In the second period, the irradiation light of the second intensity distribution pattern may be emitted.

  In this way, when the object is close to the target surface, the irradiation light of the first intensity distribution pattern and the irradiation light of the second intensity distribution pattern can be emitted alternately, so that the object has high accuracy. It becomes possible to detect the position of the object.

  In the aspect of the invention, the third intensity distribution pattern may be one of the first intensity distribution pattern and the second intensity distribution pattern.

  In this way, when it is determined that the distance of the target object from the target surface is long, by lighting one of the two light sources for forming the first and second intensity distribution patterns, A third intensity distribution pattern can be formed. As a result, it becomes possible to reduce power consumption.

  In the aspect of the invention, the first intensity distribution pattern and the second intensity distribution pattern may be intensity distribution patterns having different intensities according to positions in the detection area.

  In this way, two intensity distribution patterns having different intensities depending on the position of the object in the detection area can be formed, so that the position detection accuracy of the object can be increased.

  In the aspect of the invention, the light receiving unit includes a first light receiving unit and a second light receiving unit, and the first light receiving unit and the second light receiving unit are disposed along the Z direction. May be.

  In this way, the detection area corresponding to each of the first and second light receiving units can be set along the Z direction.

  In the aspect of the invention, the distance from the target surface of the first light receiving unit is arranged to be shorter than the distance from the target surface of the second light receiving unit, The detection area may be set narrower than the detection area of the second light receiving unit.

  In this way, since the detection area of the light receiving unit arranged near the target surface can be set narrow, for example, it is possible to increase the position detection accuracy for an object near the target surface. Become.

  In the aspect of the invention, the detection unit includes a first amplification unit and a second amplification unit that amplify a light reception detection signal from the first light reception unit and the second light reception unit, and The amplification unit 1 may be set to have a lower amplification factor.

  In this way, the light reception detection signal from the detection area close to the target surface can be amplified with a low amplification factor, and the light reception detection signal from the detection area far from the target surface can be amplified with a high amplification factor. Efficient position detection can be performed according to the position.

  In the aspect of the invention, the first light receiving unit and the second light receiving unit may include an incident light restricting unit that restricts incident light in a direction intersecting the XY plane. The incident light restriction unit of the light receiving unit may be set with a higher degree of restriction of the incident light.

  In this way, as the distance from the target surface is shorter, the degree of restriction of incident light is set stronger by the incident light restriction unit, so that the detection area can be set narrower.

  In one aspect of the present invention, the incident light limiting unit may be a slit, and the incident light limiting unit of the first light receiving unit may have a narrower width.

  In this way, as the distance from the target surface is shorter, the degree of restriction of incident light is set stronger by the slit, so that the detection area can be set narrower.

  In the aspect of the invention, the light emitting unit may weaken the intensity of the irradiation light as the distance from the target surface of the target object is longer.

  In this way, the position detection accuracy can be lowered and the power consumption can be reduced by decreasing the intensity of the irradiation light as the distance from the target surface of the target increases. As a result, position detection with good detection efficiency and power efficiency can be performed according to the position of the object.

  Another aspect of the present invention relates to an electronic apparatus and a display device including any one of the optical position detection devices described above.

FIG. 1A and FIG. 1B are basic configuration examples of the optical position detection device and the like of this embodiment. The detailed structural example of a light-projection part. 3A and 3B are diagrams illustrating a position detection method. The modification of a light-projection part. 2 shows a configuration example of a light receiving unit and a setting example of a detection area. 6A and 6B are configuration examples of a light receiving unit having an incident light limiting unit. A specific configuration example of a detection unit, a drive circuit, and the like. An example of a timing chart of a position detection operation. An example of the flow of position detection control.

  Hereinafter, preferred embodiments of the present invention will be described in detail. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are indispensable as means for solving the present invention. Not necessarily.

1. Basic Configuration Example of Optical Position Detection Device, etc. FIG. 1A and FIG. 1B show a basic configuration example of an optical position detection device of this embodiment and an electronic apparatus and a display device using the same. Indicates. FIG. 1A and FIG. 1B are examples in which the optical position detection device of this embodiment is applied to a projection display device (projector) called a liquid crystal projector or a digital micromirror device. . In FIG. 1 (A) and FIG. 1 (B), the intersecting axes are the X axis, Y axis, and Z axis (first, second, and third coordinate axes in a broad sense). Specifically, the X-axis direction is the horizontal direction, the Y-axis direction is the vertical direction, and the Z-axis direction is the depth direction.

  The optical position detection device according to the present embodiment includes a light emitting unit EU, a light receiving unit RU, and a detecting unit 50. Further, the control unit 60 may be included. The display device (electronic device) of the present embodiment includes an optical position detection device and a screen 20 (a target surface for setting a detection area in a broad sense). Furthermore, the display device (electronic device) can include an image projection device 10 (an image generation device in a broad sense). Note that the optical position detection device, the electronic apparatus, and the display device of this embodiment are not limited to the configurations in FIGS. 1A and 1B, and some of the components may be omitted or other configurations may be used. Various modifications such as replacement with elements or addition of other components are possible.

  The image projection apparatus 10 enlarges and projects image display light toward a screen 20 from a projection lens provided on the front side of the housing. Specifically, the image projection apparatus 10 generates display light of a color image and emits the light toward the screen 20 through the projection lens. As a result, a color image is displayed in the display area ARD of the screen 20.

  As shown in FIG. 1B, the optical position detection apparatus according to the present embodiment detects an object such as a user's finger or a touch pen in a detection area RDET set on the front side (Z-axis direction side) of the screen 20. Detect optically. For this purpose, the light emitting unit EU of the optical position detection device emits irradiation light LT for detecting an object in the detection area RDET. Specifically, the light emitting unit EU emits irradiation light LT having a different intensity distribution depending on the position in the detection area RDET. The detection area RDET is an area set along the XY plane on the Z direction side (user side) of the screen 20 (target surface for setting the detection area).

  The light emitting unit EU includes two light source units LS1 and LS2 (not shown) configured by light emitting elements such as LEDs (light emitting diodes). This light source unit emits, for example, infrared light (near infrared light close to the visible light region). That is, the light source light emitted from the light source unit LS1 is light in a wavelength band that is efficiently reflected by an object such as a user's finger or a touch pen, or light in a wavelength band that is not included in the ambient light that becomes disturbance light. It is desirable to be. Specifically, infrared light with a wavelength near 850 nm, which is light in a wavelength band with high reflectance on the surface of the human body, infrared light near 950 nm, which is light in a wavelength band that is not so much included in environmental light, etc. It is. A specific configuration of the light emitting unit EU will be described later.

  The light emitting unit EU of the present embodiment emits irradiation light LT of three intensity distribution patterns according to the distance from the target surface (screen) 20 of the object OB. Specifically, if the light emitting unit EU determines that the distance of the object OB from the target surface 20 where the detection area RDET is set is short, the light emitting unit EU and the irradiation light LT of the first intensity distribution pattern PID1 The irradiation light LT of the second intensity distribution pattern PID2 is emitted. More specifically, when it is determined that the distance of the object OB from the target surface 20 is short, the irradiation light LT of the first intensity distribution pattern PID1 is emitted in the first period, and the second period Then, the irradiation light LT of the second intensity distribution pattern PID2 is emitted. That is, the irradiation light LT of the first and second intensity distribution patterns PID1, PID2 is alternately emitted. Further, when it is determined that the distance of the object OB from the target surface 20 is long, the irradiation light LT of the third intensity distribution pattern PID3 is emitted. More specifically, when it is determined that the distance of the object OB from the target surface 20 is long, the irradiation light LT of the third intensity distribution pattern PID3 is emitted in the first period, and the second period Then, the irradiation light LT is not emitted.

  The first intensity distribution pattern PID1 and the second intensity distribution pattern PID2 are intensity distribution patterns having different intensities depending on the position in the detection area RDET. Further, the third intensity distribution pattern PID3 may be either one of the first intensity distribution pattern PID1 and the second intensity distribution pattern PID2. The means for forming the intensity distribution pattern will be described later.

  By doing this, when the distance of the object OB from the target surface 20 is short, that is, when the object OB is close to the target surface 20, the position detection accuracy is improved by using irradiation light of two different intensity distribution patterns. Can be high. On the other hand, when the object OB is far from the object surface 20, by using the irradiation light of one intensity distribution pattern, the position detection accuracy is lowered, but the power consumption can be reduced.

  Moreover, the light emission part EU of this embodiment can make the intensity | strength of irradiation light LT weak, so that the distance from the target surface 20 is long. By doing so, the intensity of irradiation light can be weakened for an object far from the target surface (screen), so that the position detection accuracy is reduced, but the power consumption can be reduced. .

  For example, in a detection area close to the screen (target surface) 20, an operation such as pointing to a certain place such as an image displayed on the screen or inputting information to a display device (electronic device) by handwritten characters or the like is performed. In order to accurately detect such a quick hand or finger movement, high position detection accuracy is required in the detection area close to the screen. On the other hand, in the detection area away from the screen, it is only necessary to detect the outline of the position of the object (for example, the human body), so the position detection accuracy may be lowered.

  The light receiving unit RU receives the reflected light LR reflected from the object OB in the detection area RDET. Specifically, the light receiving unit RU receives the reflected light LR resulting from the irradiation light LT from the light emitting unit EU being reflected by the object OB. The light receiving unit RU can be realized by a light receiving element such as a photodiode or a phototransistor. For example, a detection unit 50 is electrically connected to the light receiving unit RU.

  The detection unit 50 detects the position information of the object OB based on the light reception result at the light receiving unit RU. The function of the detection unit 50 can be realized by an integrated circuit device having an analog circuit or the like, or software (program) operating on a microcomputer. For example, the detection unit 50 converts the detection current generated when the light receiving element of the light receiving unit RU receives the reflected light LR from the object OB into a detection voltage, and based on the detection voltage that is the light reception result, The direction in which the OB is located is detected. Specifically, the detection unit 50 detects the distance to the object OB (the distance from the arrangement position of the light emitting unit EU) based on the light reception result (light reception signal) at the light receiving unit RU. Based on the detected distance and the detected direction (existing direction) of the object OB, the position of the object is detected. More specifically, the X and Y coordinates on the XY plane of the detection area RDET are detected.

  The control unit 60 performs various control processes of the optical position detection device. Specifically, light emission control of the light source unit included in the light emitting unit EU is performed. The control unit 60 is electrically connected to the light emitting unit EU and the detection unit 50. The function of the control unit 60 can be realized by software operating on an integrated circuit device or a microcomputer. For example, the control unit 60 performs control for switching the intensity distribution pattern of the irradiation light and control for changing the intensity of the irradiation light according to the distance of the object OB from the target surface 20. Further, for example, when the light emitting unit EU includes the first and second light source units, the control unit 60 performs control to alternately emit light from the first and second light source units.

  As described above, according to the optical position detection device of the present embodiment, the intensity distribution pattern of the irradiation light can be switched according to the distance of the target object from the screen or the like (target surface). That is, when the object is close to a screen or the like, the position detection accuracy is increased by using irradiation light of two different intensity distribution patterns (first and second intensity distribution patterns), and conversely, the object is removed from the screen or the like. In the case of being far away, by using irradiation light of one intensity distribution pattern (third intensity distribution pattern), the position detection accuracy is lowered, but the power consumption can be reduced. As a result, it is possible to realize an optical position detection device with low power consumption while maintaining the required position detection accuracy.

  The optical position detection device of the present embodiment is not limited to the projection display device shown in FIGS. 1A and 1B, and can be applied to various display devices mounted on various electronic devices. . In addition, as an electronic device to which the optical position detection device of this embodiment can be applied, various devices such as a mobile phone, a personal computer, a car navigation device, a ticket vending machine, or a bank terminal can be assumed. The electronic device can include, for example, a display unit (display device) that displays an image, an input unit for inputting information, a processing unit that performs various processes based on input information and the like.

2. Light Emitting Unit FIG. 2 shows a detailed configuration example of the light emitting unit EU included in the optical position detection device of the present embodiment. The light emitting unit EU in the configuration example of FIG. 2 includes light source units LS1 and LS2, a light guide LG, and an irradiation direction setting unit LE. Moreover, the reflective sheet RS is included. The irradiation direction setting unit LE includes the optical sheet PS and the louver film LF. Note that the light emitting unit EU of the present embodiment is not limited to the configuration of FIG. 2, and various components such as omitting some of the components, replacing them with other components, and adding other components. Can be implemented.

  The light source units LS1 and LS2 emit light source light and have light emitting elements such as LEDs (light emitting diodes). The light source units LS1 and LS2 emit, for example, infrared light (near infrared light close to the visible light region). That is, the light source light emitted by the light source units LS1 and LS2 has a wavelength band that is not so much included in light in a wavelength band that is efficiently reflected by an object such as a user's finger or a touch pen or ambient light that becomes disturbance light. It is desirable to be light. Specifically, infrared light with a wavelength near 850 nm, which is light in a wavelength band with high reflectance on the surface of the human body, infrared light near 950 nm, which is light in a wavelength band that is not so much included in environmental light, etc. It is.

  The light source unit LS1 is provided on one end side of the light guide LG as indicated by F1 in FIG. The second light source unit LS2 is provided on the other end side of the light guide LG as indicated by F2. The light source unit LS1 emits the light source light to the light incident surface on one end side (F1) of the light guide LG, thereby emitting the irradiation light LT1, and the irradiation light of the first intensity distribution pattern PID1 as the object. Formed (set) in the detection area. On the other hand, the light source section LS2 emits the second light source light to the light incident surface on the other end side (F2) of the light guide LG, thereby emitting the second irradiation light LT2, and the first intensity distribution. Irradiation light of a second intensity distribution pattern PID2 having an intensity distribution different from that of the pattern PID1 is formed in the detection area. As described above, the light emitting unit EU can emit irradiation light having different intensity distribution patterns depending on the position in the detection area RDET.

  The light guide LG (light guide member) guides the light source light emitted from the light source units LS1 and LS2. For example, the light guide LG guides the light source light from the light source units LS1 and LS2 along a curved light guide path, and the shape thereof is a curved shape. Specifically, in FIG. 2, the lie guide LG has an arc shape. In FIG. 2, the light guide LG has an arc shape with a center angle of 180 degrees, but may have an arc shape with a center angle smaller than 180 degrees. The light guide LG is formed of, for example, a transparent resin member such as acrylic resin or polycarbonate.

  At least one of the outer peripheral side and the inner peripheral side of the light guide LG is processed to adjust the light output efficiency of the light source light from the light guide LG. As a processing method, for example, various methods such as a silk printing method for printing reflective dots, a molding method for forming irregularities with a stamper or injection, and a groove processing method can be adopted.

  The irradiation direction setting unit LE (irradiation light emitting unit) realized by the prism sheet PS and the louver film LF is provided on the outer peripheral side of the light guide LG, and is emitted from the outer peripheral side (outer peripheral surface) of the light guide LG. Receive. And the irradiation light LT1 and LT2 by which the irradiation direction was set to the direction which goes to an outer peripheral side from the inner peripheral side of the light guide LG of curved shape (arc shape) are radiate | emitted. That is, the direction of the light source light emitted from the outer peripheral side of the light guide LG is set (restricted) to an irradiation direction along, for example, the normal direction (radial direction) of the light guide LG. Thereby, irradiation light LT1 and LT2 come to radiate | emit radially in the direction which goes to the outer peripheral side from the inner peripheral side of the light guide LG.

  Such setting of the irradiation direction of the irradiation light LT1, LT2 is realized by the prism sheet PS, the louver film LF, or the like of the irradiation direction setting unit LE. For example, the prism sheet PS sets the direction of the light source light emitted at a low viewing angle from the outer peripheral side of the light guide LG to the normal direction side so that the peak of the light emission characteristic is in the normal direction. The louver film LF blocks (cuts) light in a direction other than the normal direction (low viewing angle light).

  As described above, according to the light emitting unit EU of the present embodiment, the light source portions LS1 and LS2 are provided at both ends of the light guide LG, and these light source portions LS1 and LS2 are alternately turned on to thereby generate two irradiation light intensity distributions. Can be formed. That is, the first intensity distribution pattern PID1 in which the intensity on one end side of the light guide LG is increased and the second intensity distribution pattern PID2 in which the intensity on the other end side of the light guide LG is increased can be alternately formed.

  By forming such first and second intensity distribution patterns PID1 and PID2 and receiving the reflected light of the object by the irradiation light of these intensity distributions, the influence of disturbance light such as ambient light is minimized. It is possible to detect a suppressed object with higher accuracy. That is, it is possible to cancel out the infrared component included in the disturbance light, and it is possible to minimize the adverse effect of the infrared component on the detection of the object.

  Further, instead of alternately forming the irradiation light of the first and second intensity distribution patterns PID1, PID2, the position detection can be performed by forming the irradiation light of the third intensity distribution pattern PID3. The third intensity distribution pattern PID3 may be one of the first intensity distribution pattern PID1 and the second intensity distribution pattern PID2. When the irradiation light of the third intensity distribution pattern PID3 is used, the position detection accuracy is lowered, but one of the two light source units LS1 and LS2 only needs to emit light (light on), thereby reducing power consumption. be able to.

3. Position Detection Method FIGS. 3A and 3B are diagrams illustrating a position detection method by the optical position detection device of the present embodiment.

  E1 in FIG. 3A is a diagram showing the relationship between the angle of the irradiation direction of the irradiation light LT1 and the intensity of the irradiation light LT1 at that angle in the first intensity distribution pattern PID1 of FIG. At E1 in FIG. 3A, the intensity is highest when the irradiation direction is the direction DD1 in FIG. 3B (left direction). On the other hand, the intensity is lowest when the direction is DD3 (right direction), and the intensity is intermediate in the direction DD2. Specifically, the intensity of the irradiation light monotonously decreases with respect to the angle change from the direction DD1 to the direction DD3, for example, changes linearly (linearly). In FIG. 3B, the arc-shaped center position of the light guide LG is the arrangement position PE of the light emitting unit EU.

  Further, E2 in FIG. 3A is a diagram showing the relationship between the angle of the irradiation direction of the irradiation light LT2 and the intensity of the irradiation light LT2 at that angle in the second intensity distribution pattern PID2 of FIG. At E2 in FIG. 3A, the intensity is highest when the irradiation direction is the direction of DD3 in FIG. On the other hand, the intensity is the lowest in the direction of DD1, and the intermediate intensity in the direction of DD2. Specifically, the intensity of irradiation light monotonously decreases with respect to an angle change from the direction DD3 to the direction DD1, and changes linearly, for example. In FIG. 3A, the relationship between the angle in the irradiation direction and the intensity is linear, but the present embodiment is not limited to this, and may be a hyperbolic relationship, for example.

  Then, as shown in FIG. 3B, it is assumed that the object OB exists in the direction DDB of the angle θ. Then, when the first intensity distribution pattern PID1 is formed by light emission from the light source unit LS1 (in the case of E1), as shown in FIG. 3A, the target existing in the direction of DDB (angle θ) The intensity at the position of the object OB is INTa. On the other hand, when the second intensity distribution pattern PID2 is formed by light emission from the light source unit LS2 (in the case of E2), the intensity at the position of the object OB existing in the direction of DDB is INTb.

  Therefore, the direction DDB (angle θ) in which the object OB is located can be specified by obtaining the relationship between the intensities INTa and INTb. Further, for example, as shown in FIG. 4 to be described later, two irradiation units EU1 and EU2 are provided as the light emitting unit EU, and the directions DDB1 (θ1) and DDB2 (θ2) of the object OB with respect to the irradiation units of EU1 and EU2 are set. If it calculates | requires, the position of target object OB can be pinpointed by these directions DDB1 and DDB2 and distance DS between irradiation units EU1 and EU2.

  In order to obtain such a relationship between the intensity INTa and INTb, in the present embodiment, the light receiving unit RU uses the reflected light (first reflected light) of the object OB when the first intensity distribution pattern PID1 is formed. Receive light. If the detected light reception amount of the reflected light at this time is Ga, this Ga corresponds to the intensity INTa. The light receiving unit RU receives the reflected light (second reflected light) of the object OB when the second intensity distribution pattern PID2 is formed. When the detected light reception amount of the reflected light at this time is Gb, this Gb corresponds to the intensity INTb. Therefore, if the relationship between the detected light reception amounts Ga and Gb is obtained, the relationship between the intensity INTa and INTb can be obtained, and the direction DDB in which the object OB is located can be obtained.

  For example, the control amount (for example, current amount), the conversion coefficient, and the emitted light amount of the light source unit LS1 are Ia, k, and Ea, respectively. In addition, the control amount (current amount), the conversion coefficient, and the amount of emitted light of the light source unit LS2 are Ib, k, and Eb, respectively. Then, the following expressions (1) and (2) are established.

Ea = k · Ia (1)
Eb = k · Ib (2)
Further, let fa be the attenuation coefficient of the light source light (first light source light) from the light source unit LS1, and let Ga be the detected received light amount of the reflected light (first reflected light) corresponding to this light source light. Further, the attenuation coefficient of the light source light (second light source light) from the light source unit LS2 is fb, and the detected light reception amount of the reflected light (second reflected light) corresponding to the light source light is Gb. Then, the following expressions (3) and (4) are established.

Ga = fa · Ea = fa · k · Ia (3)
Gb = fb · Eb = fb · k · Ib (4)
Therefore, the ratio of the detected light reception amounts Ga and Gb can be expressed as the following equation (5).

Ga / Gb = (fa / fb). (Ia / Ib) (5)
Here, Ga / Gb can be specified from the light reception result in the light receiving unit RU, and Ia / Ib can be specified from the control amount of the light emitting unit EU by the control unit 60. Intensities INTa and INTb and attenuation coefficients fa and fb in FIG. 3A are in a unique relationship. For example, when the attenuation coefficients fa and fb are small values and the attenuation is large, it means that the strengths INTa and INTb are small. On the other hand, when the attenuation coefficients fa and fb are large and the attenuation is small, it means that the strengths INTa and INTb are large. Therefore, the direction, position, etc. of the object can be obtained by obtaining the attenuation factor ratio fa / fb from the above equation (5).

  More specifically, one control amount Ia is fixed to Im, and the other control amount Ib is controlled so that the detected light reception amount ratio Ga / Gb becomes 1. For example, the light source units LS1 and LS2 are controlled to turn on alternately in reverse phase, the detected received light amount waveform is analyzed, and the other control is performed so that the detected waveform is not observed (Ga / Gb = 1). The amount Ib is controlled. Then, from the other control amount Ib = Im · (fa / fb) at this time, the ratio fa / fb of the attenuation coefficient is obtained, and the direction, position, etc. of the object are obtained.

  Further, as in the following formulas (6) and (7), control may be performed so that Ga / Gb = 1 and the sum of the control amounts Ia and Ib is constant.

Ga / Gb = 1 (6)
Im = Ia + Ib (7)
Substituting the above equations (6) and (7) into the above equation (5), the following equation (8) is established.

Ga / Gb = 1 = (fa / fb) · (Ia / Ib)
= (Fa / fb) · {(Im−Ib) / Ib} (8)
From the above equation (8), Ib is expressed as the following equation (9).

Ib = {fa / (fa + fb)} · Im (9)
Here, if α = fa / (fa + fb), the above equation (9) is expressed as the following equation (10), and the attenuation coefficient ratio fa / fb is expressed by the following equation (11) using α. It is expressed in

Ib = α · Im (10)
fa / fb = α / (1-α) (11)
Therefore, if Ga / Gb = 1 and control is performed so that the sum of Ia and Ib becomes a constant value Im, α is obtained from Ib and Im at that time by the following equation (10), and the obtained α is increased. By substituting into Equation (11), the ratio fa / fb of the attenuation coefficient can be obtained. This makes it possible to obtain the direction, position, etc. of the object. Further, by controlling so that Ga / Gb = 1 and the sum of Ia and Ib becomes constant, it becomes possible to cancel the influence of disturbance light and the like, and the detection accuracy can be improved.

  FIG. 4 shows a modification of the light emitting unit EU of the present embodiment. In FIG. 4, first and second irradiation units EU <b> 1 and EU <b> 2 are provided as the light emitting unit EU. These first and second irradiation units EU1 and EU2 are arranged apart by a given distance DS in the direction along the surface of the detection area RDET of the object OB. That is, they are arranged apart from each other by a distance DS along the X-axis direction of FIGS. 1 (A) and 1 (B).

  The first irradiation unit EU1 emits first irradiation light having different intensities according to the irradiation direction radially. The second irradiation unit EU2 emits second irradiation light having different intensities according to the irradiation direction radially. The light receiving unit RU targets the first reflected light by reflecting the first irradiation light from the first irradiation unit EU1 on the object OB and the second irradiation light from the second irradiation unit EU2. Second reflected light is received by being reflected by the object OB. And the detection part 50 detects the position POB of the target object OB based on the light reception result in the light-receiving part RU.

  Specifically, the detection unit 50 detects the direction of the object OB relative to the first irradiation unit EU1 as the first direction DDB1 (angle θ1) based on the reception result of the first reflected light. Further, based on the reception result of the second reflected light, the direction of the object OB relative to the second irradiation unit EU2 is detected as the second direction DDB2 (angle θ2). Then, based on the detected first direction DDB1 (θ1) and second direction DDB2 (θ2) and the distance DS between the first and second irradiation units EU1 and EU2, the position POB of the object OB. Ask for.

4). Light Receiving Unit and Detection Area FIG. 5 shows a configuration example of the light receiving unit RU and a setting example of the detection area RDET of the optical position detection device of the present embodiment. The light receiving unit RU of the optical position detection device of the present embodiment includes first and second light receiving units PD1 and PD2. Note that the light receiving unit RU of the present embodiment is not limited to the configuration of FIG. 5, and various components such as omitting some of the components, replacing them with other components, and adding other components. Variations are possible. For example, although the first and second light receiving units PD1 and PD2 are shown in the configuration of FIG. 5, the configuration may include three or more light receiving units.

  The first and second light receiving units PD1 and PD2 are arranged along the Z direction, and can be realized by a light receiving element such as a photodiode or a phototransistor, for example. For example, as shown in FIG. 5, the distance from the target surface 20 of the first light receiving unit PD1 is arranged to be shorter than the distance from the target surface 20 of the second light receiving unit PD2. Then, first and second detection areas RDET1 and RDET2 are set corresponding to the first and second light receiving units PD1 and PD2.

  Specifically, for example, as shown in A1 of FIG. 5, when the object OB exists in the first detection area RDET1, the irradiation light LT from the light emitting unit EU is reflected by the object OB, The first light receiving unit PD1 receives the reflected light LR. As shown in A2 of FIG. 5, when the object OB exists in the second detection area RDET2, the second light receiving unit PD2 receives the reflected light LR from the object OB.

  By doing so, it is possible to determine in which of the detection areas RDET1 and RDET2 the object OB is present. Specifically, when the first light receiving unit PD1 receives the reflected light LR, it is determined that the object OB exists in the first detection area RDET1, and the second light receiving unit PD2 receives the reflected light LR. In this case, it can be determined that the object OB exists in the second detection area RDET2. If it is determined that the object OB exists in RDET1, the light emitting unit EU emits the irradiation light of the first intensity distribution pattern PID1 and the irradiation light of the second intensity distribution pattern PID2. When it is determined that the object OB exists in RDET2, the light emitting unit EU emits irradiation light of the third intensity distribution pattern PID3.

  The detection area RDET1 of the first light receiving unit PD1 is set narrower than the detection area RDET2 of the second light receiving unit PD2. Specifically, for example, as shown in FIG. 5, the spread of each detection area (spread in the Z direction) can be defined from a certain point PA on the target surface (screen) 20 along the Z direction. That is, the first detection area RDET1 is a region having a depth (expansion) of length ZA in the Z direction, and the second detection area RDET2 is a region having a depth (expansion) of length ZB in the Z direction. is there. When defined in this way, the detection areas RDET1 and RDET2 are set so that ZA <ZB.

  The first and second light receiving units PD1 and PD2 have an incident light limiting unit LMT that limits incident light in a direction intersecting the XY plane, and the incident light limiting unit of the first light receiving unit PD1 is more The degree of restriction of incident light is set strongly. As a result, as described above, the detection area RDET1 of the first light receiving unit PD1 having a short distance from the target surface (for example, the screen) 20 is set to be narrower.

  FIGS. 6A and 6B show a configuration example of a light receiving unit having an incident light limiting unit LMT. As shown in FIG. 6A, an incident light limiting unit LMT is provided in front of the light receiving element PHD to limit incident incident light. Specifically, the incident light limiting unit LMT is a slit SLT, and the width of the slit SLT is narrower as the distance from the target surface (screen) 20 is shorter. Specifically, for example, in PD1 and PD2 of FIG. 5, when the slit width of PD1 is WA and the slit width of PD2 is WB, WA <WB. By doing so, the shorter the distance from the target surface (screen) 20, the narrower the range of angles in the Z direction of the incident light incident on the light receiving unit. As a result, as described above, the detection area RDET1 of PD1 close to the target surface (for example, the screen) 20 is set to be narrower.

  FIG. 6B is a plan view seen from above of the light receiving unit having the slit SLT. For example, a wiring board PWB is provided in a housing (case) 100 made of aluminum or the like, and a light receiving element PHD is mounted on the wiring board PWB.

  As described above, according to the optical position detection device of the present embodiment, by providing a plurality of light receiving units arranged along the Z direction and further limiting incident light incident on each light receiving unit, A plurality of detection areas arranged along the Z direction can be set corresponding to each light receiving unit. By doing so, it is possible to determine whether the object is near or far from the screen or the like (target surface), and based on this determination, the intensity distribution pattern of the irradiation light can be switched. Furthermore, since the detection area can be set narrower as the distance from the screen or the like is shorter, for example, it is possible to increase the position detection accuracy only for an object near the screen or the like.

5). FIG. 7 shows a specific configuration example of the detection unit 50, the drive circuit 70, and the like according to this embodiment. The detection unit 50 includes signal detection circuits 52a and 52b (first and second amplification units in a broad sense), signal separation circuits 54a and 54b, and a determination unit 56. The light receiving unit RU includes first and second light receiving units PD1 and PD2. The first and second light receiving units PD1 and PD2 are arranged along the Z direction, for example, as shown in FIG. Note that the detection unit 50, the drive circuit 70, and the like of the present embodiment are not limited to the configuration in FIG. 7, and some of the components are omitted, replaced with other components, or other components are added. Various modifications can be made such as.

  The drive circuit 70 drives the light emitting element LEDA of the light source unit LS1 and the light emitting element LEDB of the light source unit LS2. The drive circuit 70 includes variable resistors RA and RB. A rectangular waveform drive signal SDE1 is input from the control unit 60 to one end of the variable resistor RA. The variable resistor RA is provided between the input node N1 of the signal SDE1 and the node N2 on the anode side of the light emitting element LEDA. The variable resistor RB is provided between the input node N3 of the drive signal SDE2 and the node N4 on the anode side of the light emitting element LEDB. The light emitting element LEDA is provided between the node N2 and GND (VSS), and the light emitting element LEDB is provided between the node N4 and GND.

  During the period in which the drive signal SDE1 is at the H level, a current flows through the light emitting element LEDA via the variable resistor RA, and the light emitting element LEDA emits light. Further, during the period in which the drive signal SDE2 is at the H level, a current flows to the light emitting element LEDB via the variable resistor RB, and the light emitting element LEDB emits light. Thus, the light sources LS1 and LS2 can be made to emit light alternately by the drive signals SDE1, SDE2.

  As described above, in the optical position detection device according to the present embodiment, the light receiving unit (detects the reflected light) on which the reflected light is incident, depending on which detection area of the detection areas RDET1 and RDET2 the object OB exists. The light receiving unit is different. For example, as described with reference to FIG. 5, when the object OB exists in the detection area RDET1, the first light receiving unit PD1 detects the reflected light, and when the object OB exists in the detection area RDET2, the second light is detected. The light receiving unit PD2 detects the reflected light.

  The light receiving unit PD1 includes a light receiving element PHD realized by a photodiode or the like, and a current / voltage converting resistor R1. In the period (first period) in which the light source unit LS1 emits light, the reflected light of the object OB by the light from the light emitting element LEDA is incident on the light receiving element PHD of the light receiving unit PD1, for example, and the resistor R1 and the light receiving element PHD Current flows, and a voltage signal is generated at the node N5. On the other hand, in the period (second period) in which the light source unit LS2 emits light, the reflected light of the object OB by the light from the light emitting element LEDB is incident on the light receiving element PHD of the light receiving unit PD1, for example, and the resistor R1 and the light receiving element A current flows through the PHD, and a voltage signal is generated at the node N5. The second light receiving unit PD2 can also have the same configuration.

  The signal detection circuit (amplification unit) 52a includes a capacitor CF, an operational amplifier OP1, and a resistor R2, and amplifies the light reception detection signal from the first light reception unit PD1. Capacitor CF functions as a high-pass filter that cuts the DC component (DC component) of the voltage signal at node N5. By providing such a capacitor CF, it is possible to cut low frequency components and direct current components caused by ambient light and improve detection accuracy. The DC bias setting circuit including the operational amplifier OP1 and the resistor R2 is a circuit for setting a DC bias voltage (VB / 2) for the AC signal after the DC component cut. The second signal detection circuit (amplifying unit) 52b can have the same configuration, and amplifies the light reception detection signal from the second light reception unit PD2.

  The signal separation circuit 54a includes a selection circuit SEL, capacitors CA and CB, and an operational amplifier OP2. The selection circuit SEL selects one of the two input nodes of the operational amplifier OP2 and inputs the output from the signal detection circuit 52a based on the detection control signal SDR1. Specifically, in the first period, the output node N7 of the signal detection circuit 52a is connected to the node N8 on the inverting input side (−) of the operational amplifier OP2. On the other hand, in the second period, the output node N7 of the signal detection circuit 52a is connected to the non-inverting input (+) node N8 of the operational amplifier OP2. The operational amplifier OP2 compares the voltage signal at the node N8 held by the capacitor CA with the voltage signal at the node N9 held by the capacitor CB. The second signal separation circuit 54b can also have the same configuration and is controlled based on the detection control signal SDR2.

  The control unit 60 controls the resistance values of the variable resistors RA and RB of the drive circuit 70 based on the control signals SCA and SCB based on the comparison result of the voltage signals of the nodes N8 and N9 in the signal separation circuits 54a and 54b. The determination unit 56 performs determination processing of the position of the object based on the control result of the resistance values of the variable resistors RA and RB in the control unit 60. Further, the control unit 60 determines which detection area of the detection areas RDET1 and RDET2 the object OB exists based on the position detection result of the object, and performs control to switch the intensity distribution pattern of the irradiation light. .

  In the optical position detection device of the present embodiment, when the detected light reception amount of the light receiving element PHD in the first period is Ga and the detected light reception amount of the light receiving element PHD in the second period is Gb, this detected light reception amount The control unit 60 controls the resistance values of the variable resistors RA and RB based on the comparison result in the signal separation circuits 54a and 54b so that the ratio Ga / Gb of the signal becomes 1. That is, the light emission control of the light source units LS1 and LS2 is performed so that the ratio Ga / Gb of the detected light reception amount becomes 1. In this way, the process of determining the position of the object is performed by controlling Ga / Gb = 1.

  Furthermore, according to the optical position detection apparatus of the present embodiment, the light emitting unit EU can reduce the intensity of the irradiation light as the distance of the object OB from the target surface (for example, the screen) is longer. Specifically, for example, when the object OB is present (detected) in the detection area RDET2 far from the target surface (screen or the like), the control unit 60 uses the variable resistances RA, RB based on the control signals SCA, SCB. Is controlled to reduce both the light emission intensities of the light source portions LS1 and LS2 and weaken the intensity of the irradiation light. By doing so, it is possible to reduce the position detection accuracy and reduce power consumption for an object far from the screen or the like.

  Furthermore, in the optical position detection device of the present embodiment, the amplification factors of the first and second amplification units are set according to the Z coordinate position. Specifically, for example, the amplification factor of the first amplification unit (signal detection circuit) 52a that amplifies the light reception detection signal from the light reception unit PD1 is G1, and the second amplification that amplifies the light reception detection signal from the light reception unit PD2. When the amplification factor of the unit (signal detection circuit) 52b is G2, G1 <G2. By doing so, it is possible to amplify a light reception detection signal from an object close to a screen or the like with a low amplification factor, and amplify a light reception detection signal from an object far from the screen or the like with a high amplification factor. Efficient position detection can be performed according to the position of the object.

6). Position Detection Operation FIG. 8 is an example of a timing chart of the position detection operation in the configuration example (FIGS. 5 and 7) of the optical position detection device of the present embodiment. The timing chart of FIG. 8 shows drive signals SDE1 and SDE2 for driving the light source units (for example, LEDs) LS1 and LS2 of the light emitting unit EU. In addition, detection control signals SDR1 and SDR2 for controlling reception of light reception detection signals from the light receiving units PD1 and PD2 are shown. Further, light reception detection signals SPD1 and SPD2 of the light receiving units PD1 and PD2 are shown. The drive signals SDE1 and SDE2 and the detection control signals SDR1 and SDR2 are generated by the control unit 60.

  As described above, in the optical position detection device of the present embodiment, the light emitting unit EU emits the irradiation light LT of three intensity distribution patterns according to the distance from the target surface (screen) 20 of the target object OB. . That is, when it is determined that the distance of the object OB from the target surface 20 is short (for example, when the object is detected in the detection area RDET1), the light emitting unit EU irradiates the first intensity distribution pattern PID1. The light LT and the irradiation light LT of the second intensity distribution pattern PID2 are emitted. When it is determined that the distance of the object OB from the target surface 20 is long (for example, when the object is detected in the detection area RDET2), the irradiation light LT of the third intensity distribution pattern PID3 is emitted.

  Specifically, for example, as shown in A1 of FIG. 8, when it is determined that the distance of the object OB from the target surface 20 is short, the drive signal SDE1 becomes H level in the first period TA1, The light source unit LS1 emits light and emits the irradiation light LT of the first intensity distribution pattern PID1. In the second period TA2, the drive signal SDE2 becomes H level, the light source unit LS2 emits light, and emits the irradiation light LT of the second intensity distribution pattern PID2. That is, the irradiation light LT of the first and second intensity distribution patterns PID1, PID2 is alternately emitted.

  For example, as illustrated in A2 of FIG. 8, when it is determined that the distance of the object OB from the target surface 20 is long, the light source unit LS1 emits the third intensity distribution pattern PID3 in the first period TB1. The light LT is emitted, and the irradiation light LT is not emitted in the second period TB2. In FIG. 8, the third intensity distribution pattern PID3 is the same intensity distribution pattern as the first intensity distribution pattern PID1, but PID3 may be the same as the second intensity distribution pattern PID2.

  The light reception detection signals SPD1 and SPD2 from the light reception units PD1 and PD2 are taken into the detection unit 50 in synchronization with the detection control signals SDR1 and SDR2. If it is determined that the distance of the object OB from the target surface 20 is short, the light reception detection signals SPD1 and SPD2 have signal waveforms as shown in A3 of FIG. This light reception detection signal includes a noise component VA due to ambient light (external light) or the like. By detecting a difference V1 between the signal level of the first period TA1 and the signal level of the second period TA2, The influence of ambient light and the like can be removed.

  On the other hand, when it is determined that the distance of the object OB from the target surface 20 is long, the light reception detection signals SPD1 and SPD2 have signal waveforms as shown by A4 in FIG. 8, for example. This received light detection signal also includes a noise component VA due to ambient light (external light) or the like, but by detecting a difference V2 between the signal level of the first period TB1 and the signal level of the second period TB2, The influence of ambient light and the like can be removed. In this case, since the irradiation light of one intensity distribution pattern is used, the position detection accuracy is lowered, but it is only necessary to emit one light source unit, so that it is possible to reduce power consumption.

  FIG. 9 shows an example of a flow of position detection control by the control unit 60. The flow (steps S1 to S6) shown in FIG. 9 corresponds to the position detection operation of FIG. 8 described above. For example, steps S1 and S2 correspond to the operations of A1 and A3 in FIG. 8, and steps S4 and S5 correspond to the operations of A2 and A4 in FIG.

  First, driving of the light source parts LS1 and LS2 is started, and irradiation light of the first and second intensity distribution patterns is emitted (step S1). Next, the position of the object is detected from the detection results of the light receiving units PD1 and PD2 (step S2). Then, it is determined whether or not an object exists in the second detection area RDET2 (step S3). If there is an object, the process proceeds to step S4. On the other hand, if the object does not exist, the process of step S2 is repeated.

  In step S4, the driving of the light source unit LS2 is stopped, and only the light source unit LS1 is driven to emit the irradiation light of the third intensity distribution pattern. Next, the position of the object is detected from the detection results of the light receiving units PD1 and PD2 (step S5). Then, it is determined whether or not an object exists in the first detection area RDET1 (step S6). If there is an object, the process returns to step S1 and emits irradiation light of the first and second intensity distribution patterns. On the other hand, if the object does not exist, the process of step S5 is repeated.

  As described above, when the object is present in a detection area (for example, RDET2) away from the screen or the like, the position detection accuracy is reduced but the power consumption is reduced by using the irradiation light of the third intensity distribution pattern. can do. On the other hand, when the object is present in a detection area (for example, RDET1) close to a screen or the like, the position detection accuracy can be increased by using the irradiation light of the first and second intensity distribution patterns. As a result, it is possible to perform position detection with high power efficiency while maintaining the required position detection accuracy according to the distance of the object from the screen or the like.

  In addition, the light emission control method of this embodiment is not limited to the method demonstrated in FIGS. 7-9, A various deformation | transformation implementation is possible. For example, a method of using the light emitting element LEDB of FIG. 7 as the light emitting element of the reference light source unit may be adopted. For example, the reference light source unit is disposed at a distance closer to the light receiving unit RU than the other light source units (LS1 and LS2 in FIG. 2), or is disposed in the same housing as the light receiving unit RU, so that the ambient light The light source unit is arranged and set so that the incidence of disturbance light, reflected light from an object, and the like is restricted. Then, the control unit 60 causes the light source unit LS1 and the reference light source unit to emit light alternately in the first period so that the detected light received by the light receiving unit RU is equal. Perform light emission control. Further, in the second period, the second light source unit LS2 and the reference light source unit emit light alternately, and the second light source unit LS2 and the reference light source unit emit light so that the detected light reception amounts in the light receiving unit RU are equal. Take control. In this way, the detected light reception amount in the first light emission period in which the light source unit LS1 emits light and the detected light reception amount in the second light emission period in which the second light source unit LS2 emits light are the reference light source unit. The light emission control is performed so as to be substantially equal to each other.

  Moreover, you may use the light source part for a reference with the light source parts LS11-LS22 of FIG. For example, the reference light source unit is disposed closer to the light receiving unit RU than the other light source units (LS11 to LS22) or is disposed in the same housing as the light receiving unit RU, so that ambient light (disturbance light) The light source unit is arranged and set so that the incidence of the reflected light from the object is regulated. Then, the control unit 60 causes the first light source unit LS11 of FIG. 4 and the reference light source unit (not shown) to emit light alternately in the first period, and the detected light reception amount in the light receiving unit RU is equal. Light emission control of the light source unit LS11 and the reference light source unit is performed. Further, in the second period, the second light source unit LS12 and the reference light source unit emit light alternately, and the second light source unit LS12 and the reference light source unit emit light so that the detected light reception amounts in the light receiving unit RU are equal. Take control. Further, in the third period, the third light source unit LS21 and the reference light source unit emit light alternately, and the third light source unit LS21 and the reference light source unit emit light so that the detected light reception amount in the light receiving unit RU becomes equal. Take control. Further, the fourth light source unit LS22 and the reference light source unit emit light alternately in the fourth period, and the fourth light source unit LS22 and the reference light source unit emit light so that the detected light reception amounts at the light receiving unit RU are equal. Take control. In this way, the detected light reception amount in the first light emission period in which the first light source unit LS11 emits light and the detected light reception amount in the second light emission period in which the second light source unit LS12 emits light are referred. The light emission control is performed so as to be substantially equal via the light source unit. Further, the detected light reception amount in the third light emission period in which the third light source unit LS21 emits light and the detected light reception amount in the fourth light emission period in which the fourth light source unit LS22 emits light are transmitted via the reference light source unit. Thus, the light emission control is performed so as to be substantially equal.

  Although the present embodiment has been described in detail as described above, it will be easily understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. Accordingly, all such modifications are intended to be included in the scope of the present invention. For example, a term described with a different term having a broader meaning or the same meaning at least once in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. Further, the configurations and operations of the optical position detection device, the electronic device, and the display device are not limited to those described in this embodiment, and various modifications can be made.

EU light emitting part, RU light receiving part, ARD display area, LT irradiation light,
LR reflected light, PD1, PD2 light receiving unit,
RDET, RDET1, RDET2 detection area, LMT incident light limiting unit,
SLT slit, LG, LG1, LG2 light guide, LS1, LS2 light source part,
RS reflective sheet, PS prism sheet, LF louver film,
LE irradiation direction setting unit, PID1 to PID3 first to third intensity distribution patterns,
10 image projector, 20 screen (target surface), 50 detector,
52 signal detection circuit (amplification unit), 54 signal separation circuit, 56 determination unit, 60 control unit,
70 drive circuit, 100 housing

Claims (12)

A light emitting unit that emits irradiation light to a detection area set along the XY plane;
A light receiving unit that receives reflected light caused by the irradiation light reflected on an object in the detection area;
A detection unit that detects position information of the object based on a light reception result of the light receiving unit;
The light emitting part is
When it is determined that the distance of the object from the target surface for setting the detection area is short, the irradiation light of the first intensity distribution pattern and the irradiation light of the second intensity distribution pattern are emitted. ,
An optical position detection device that emits the irradiation light of a third intensity distribution pattern when it is determined that the distance of the object from the object surface is long. In claim 1,
The light emitting unit emits the irradiation light of the first intensity distribution pattern in the first period when it is determined that the distance of the object from the target surface is short, and in the second period An optical position detection apparatus that emits the irradiation light of the second intensity distribution pattern. In claim 1 or 2,
The optical position detection device, wherein the third intensity distribution pattern is any one of the first intensity distribution pattern and the second intensity distribution pattern. In any one of Claims 1 thru | or 3,
The optical position detection apparatus according to claim 1, wherein the first intensity distribution pattern and the second intensity distribution pattern are intensity distribution patterns having different intensities according to positions in the detection area. In any one of Claims 1 thru | or 4,
The light receiving unit includes a first light receiving unit and a second light receiving unit,
The optical position detection device, wherein the first light receiving unit and the second light receiving unit are arranged along a Z direction. In claim 5,
The distance from the target surface of the first light receiving unit is arranged to be shorter than the distance from the target surface of the second light receiving unit,
The optical position detection device according to claim 1, wherein the detection area of the first light receiving unit is set narrower than the detection area of the second light receiving unit. In claim 5 or 6,
The detection unit includes a first amplification unit and a second amplification unit that amplify a light reception detection signal from the first light reception unit and the second light reception unit,
The optical position detection device is characterized in that the first amplification unit has a lower amplification factor. In any of claims 5 to 7,
The first light receiving unit and the second light receiving unit have an incident light limiting unit that limits incident light in a direction intersecting the XY plane,
The optical position detection device according to claim 1, wherein the incident light restriction unit of the first light receiving unit is set to have a higher degree of restriction of the incident light. In claim 8,
The incident light limiting unit is a slit,
The optical position detection device according to claim 1, wherein the slit of the incident light restricting portion of the first light receiving unit is narrower. In any one of Claims 1 thru | or 9,
The optical position detecting device, wherein the light emitting unit weakens the intensity of the irradiation light as the distance from the target surface of the target object increases.   An electronic apparatus comprising the optical position detection device according to claim 1.   A display device comprising the optical position detection device according to claim 1.

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