Approach detection device

Abstract

This invention provides a proximity detection device capable of more accurately estimating a horizontal position. The proximity detection device (100) of this invention includes a plurality of light-emitting elements (110) and a plurality of light-receiving elements (120) disposed at the lower part of a touch panel type display. The light-receiving elements (120) receive reflected light from an object when illumination light from the light-emitting elements (110) is reflected by the object, thereby detecting the approach of the object. The proximity detection device (100) includes: a driving circuit (130) that sequentially drives the plurality of light-emitting elements (100); a measurement circuit (140) that measures the detection level of the light-receiving elements (120) when the plurality of light-emitting elements emit light sequentially; and a control unit (150) that has the function of estimating a horizontal position based on the plurality of measurement results and correcting the estimated position.

Description

Technical Field

[0001] This invention relates to a proximity detection device for detecting the presence or absence of an object, and more particularly to a proximity detection device installed in electronic devices such as touch panel displays. Background Technology

[0002] In recent years, with the practical application of input methods such as touch panel displays and gesture input, proximity detection devices have been increasingly incorporated into vehicle displays. Proximity detection devices, for example, use light-receiving elements such as infrared LEDs and photodiodes that emit infrared light to illuminate an object and receive its reflected light to detect the object's proximity (e.g., Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-74465 Summary of the Invention

[0006] In recent years, proximity detection devices have been increasingly integrated into vehicle-mounted displays. An example of this proximity detection device is shown below. Figure 1 A touch panel display 1 is installed in the center console 2 located between the driver's seat and the front passenger seat. The display 1 includes a proximity detection device for detecting hand gestures and other gestures by the driver or passenger. The proximity detection device includes... Figure 1 As shown in (B), the display includes: four light-emitting elements LED1, LED2, LED3, and LED4 disposed in the lower part 3 of the display 1; and two light-receiving elements PD1 and PD2 (collectively referred to as light-emitting elements LED and light-receiving elements PD). The light-emitting elements LED and light-receiving elements PD are arranged in a generally linear manner in the lower part 3 of the display 1. The light-receiving element PD1 is disposed between the light-emitting elements LED1 and LED2, and the light-receiving element PD2 is disposed between LED3 and LED4. The light-emitting elements LED are light-emitting diodes that emit infrared light, and the light-receiving elements PD are photodiodes or phototransistors that receive reflected infrared light.

[0007] The light-emitting element LED illuminates infrared light onto the front surface of the display 1. When the user's object (hand, finger, etc.) 4 approaches the front surface of the display 1, the illumination light 5 from the light-emitting element LED is reflected by the object 4. The reflected light is received by the light-receiving element PD, which detects the approach of the object 4.

[0008] Figure 2The operating timing of the light-emitting elements (LEDs) and the light-receiving element (PD) is shown. LEDs 1, 2, 3, and 4 are driven sequentially at times t1, t2, t3, and t4, each emitting light in a non-repeating manner. The light-receiving element PD1 is controlled to receive light at a timing synchronized with the emission periods of LEDs 1 and 2, and the light-receiving element PD2 is controlled to receive light at a timing synchronized with the emission periods of LEDs 3 and 4. Specifically, the reflected light from LED 1 is measured via PD1 (LED1→PD1), the reflected light from LED 2 is measured via PD1 (LED2→PD1), the reflected light from LED 3 is measured via PD2 (LED3→PD2), and the reflected light from LED 4 is measured via PD2 (LED4→PD2). These four measurements constitute one cycle.

[0009] With the spacing between the light-emitting elements and the light-receiving elements configured to be approximately equal, the detection levels of the light-receiving elements PD1 and PD2 in one cycle when the object 4 is moved horizontally in front of the screen are as follows: Figure 3 The results are roughly the same. In a display with such proximity detection, the horizontal position of the object 4 can be estimated based on the distribution of reflected light detected when the individual LEDs are illuminated.

[0010] Figure 4 Example (A) shows operand 4 located in P1 and P2. Figure 4 (B) indicates the detection level of the light-receiving element PD when the object 4 is close to position P1 on the left side of the screen. Figure 4 (C) indicates the detection level of the light-receiving element PD when the object being operated on is close to position P2 on the right side of the screen. Figure 4 (D) represents the estimated horizontal position G of the object 4.

[0011] Position P1 is near the light-emitting element L1. Therefore, the detection level of the light-receiving element PD1 is the highest when the light-emitting element LED1 emits light, and the detection level gradually decreases when the light-emitting elements LED2, LED3, and LED4 emit light. Similarly, position P2 is near the light-emitting element L4. Therefore, the detection level is the highest when the light-emitting element LED4 emits light, and the detection level gradually decreases when the light-emitting elements LED3, LED2, and LED1 emit light.

[0012] As a method for quantifying the horizontal position of the object under test based on the distribution of such detection levels, the centroid calculation method is generally effective. This calculation method will be explained. For example, if the coordinates of the horizontal position detected by the light-emitting elements LED1, LED2, LED3, and LED4 are set to x1, x2, x3, and x4, and the light emission of each light-emitting element LED is set to be the same, then the horizontal position of the object under test can be estimated according to equation (1). A1, A2, A3, and A4 are the detection levels when the light-emitting elements LED1, LED2, LED3, and LED4 emit light.

[0013] [Formula 1]

[0014]

[0015] Here, if we set x1 to x4 as approximately equal intervals of x1 = 1, x2 = 2, x3 = 3, x4 = 4, then equation (1) is expressed as equation (2).

[0016] [Formula 2]

[0017]

[0018] According to equation (2), the estimated position G can be calculated within the range of 1 ≤ G ≤ 4. Assuming that when the object 4 approaches position P1, if the detection levels are A1 = 2000, A2 = 700, A3 = 100, and A4 = 10, then according to equation (2), the estimated position G = 1.3. Furthermore, when approaching position P2, if the detection levels are A1 = 10, A2 = 100, A3 = 700, and A4 = 2000, then the estimated position G = 3.7.

[0019] By estimating the horizontal position of the object being operated on in this way, it can be determined that a sliding operation has been performed if, for example, the horizontal position changes by a specified value or more within a specified time (e.g., 1 second). This can be applied to gesture operations.

[0020] Figure 5The flowchart illustrates the aforementioned process for estimating the horizontal position. First, measurements A1, A2, A3, and A4 are obtained for the light-receiving elements PD1 and PD2 when the light-emitting elements LED1, LED2, LED3, and LED4 are irradiated sequentially (S100). Based on these measurements, an index value V is calculated. This index value V is used to evaluate whether there is a sufficient detectable object for position determination (S110). The index value V can be calculated, for example, by taking the maximum value of the detection level measurements A1, A2, A3, and A4. If the index value V exceeds a predetermined threshold (S120), it is determined that a meaningful detectable object exists, and the horizontal position of the detectable object is estimated (S130). The position estimation is performed, for example, using the above-mentioned formulas (1) and (2) for calculating the center of gravity, to calculate the estimated horizontal position G of the detectable object. If the index value V is less than the threshold, position estimation is not performed, and the process returns to the next measurement.

[0021] In recent years, there has been a trend towards larger in-vehicle displays, with examples of displays exceeding 10 inches, and even 15 inches or more, being installed in the center console. With such large displays, depending on the user's position, the horizontal position estimation based on proximity detection sometimes fails to function properly.

[0022] Figure 6 This illustrates an example of a driver operating a large-screen display. For example... Figure 6 As shown in (A), when the driver is operating the screen of display 1 at a position closer to the driver, the reflected light detected by the light receiving element PD is as described above. The detection level of the reflected light when the light emitting elements LED4 and LED3 are emitting light is high, while the detection level of the reflected light when the light emitting elements LED2 and LED1 are emitting light is continuously decreasing.

[0023] On the other hand, such as Figure 6 As shown in (B), when operating from the passenger side of the screen on display 1, which is relatively far from the driver, the driver's arm 4A is close to the screen due to the larger screen size. Therefore, the reflected light from the LEDs 2, 3, and 4 increases, resulting in a higher detection level than in (B). Figure 4 (B) is larger. This situation is shown in... Figure 6 (C).

[0024] In the formula for calculating the estimated horizontal position, changes in the values ​​of detection levels A2, A3, and A4 will significantly impact the estimated position G. For example, in... Figure 4As explained in (B), the estimated position G = 1.33 is calculated based on the detection levels A1 = 2000, A2 = 700, A3 = 100, and A4 = 10. However, due to the influence of reflection from the arm part 4A, for example, if the detection levels change to A2 = 500 and A3 = 400, the estimated position G = 1.81, resulting in a large error in the estimated position G.

[0025] When determining a sliding operation based on the presumed position G, if there is a movement of a certain position or more within 1 second (e.g., 2.1 or more), then if a sliding operation is determined to exist, and the operation object 4 is moved from... Figure 6 The position of (A) towards Figure 6 The calculated result of the position movement of (B) should have been a movement of "3.8" → "1.33" to be considered a sliding operation. However, due to the error in the estimated position G, it became "3.8" → "1.81", which is insufficient to be considered a sliding operation. As a result, the gesture operation could not be recognized.

[0026] Such problems are considered to arise from setting the amount of movement used to detect the slippage too small, or setting the detected position, for example... Figure 7 The mapping transformation shown in (A) allows for easy handling. However, this modified method has limitations in situations such as... Figure 7 As shown in (B), when the object is operated on a higher position on the screen of display 1, it is effective because the arm part 4A reflects the irradiated light, but as shown in (B), Figure 7 When operating from a relatively low position on the display 1 screen, as shown in (C), the arm 4A will not affect the operation even when operating from the passenger side, so such correction is unnecessary. Instead, such correction could lead to false detections of sliding operations, such as those performed on the air conditioning controls typically located at the bottom of the display. To prevent this, the processing could be adjusted based on the arm's height position, but this would require sensors with additional light-emitting / receiving elements to detect the height position, increasing hardware complexity.

[0027] The purpose of this invention is to solve such conventional problems and provide a proximity detection device that can more accurately estimate the position in the horizontal direction.

[0028] The proximity detection device of the present invention uses a plurality of light-emitting elements and a light-receiving element to detect the approach of an object by receiving reflected light from the plurality of light-emitting elements after it has been reflected by an object. The device includes: a driving unit that sequentially drives a plurality of light-emitting elements arranged in a straight line in a horizontal direction; a measuring unit that measures the detection level of the light-receiving element when the plurality of light-emitting elements emit light sequentially; an estimation unit that estimates the horizontal position of the object based on the multiple measurement results of the measuring unit; and a correction unit that corrects the estimated position estimated by the estimation unit, wherein the correction unit corrects the estimated position by a larger amount closer to the horizontal direction and a smaller amount closer to the opposite side.

[0029] In one embodiment, the correction unit calculates the peak position of the detection level based on the measurement results of the measurement unit, and corrects the estimated position based on the calculated peak position. In one embodiment, the correction unit determines the weighting coefficient in such a way that the correction amount based on the peak position is larger the closer to one side, and smaller the correction amount based on the peak position is the closer to the other side. In one embodiment, the estimation unit calculates the estimated position by calculating the centroid of the horizontal coordinates detected by the respective detection levels of the plurality of light-emitting elements and the plurality of measurement results of the measurement unit. In one embodiment, the correction unit corrects the estimated position using (1-w)×G+w×P (where w is the weighting coefficient, G is the estimated position, and P is the peak position). In one embodiment, the plurality of light-emitting elements and the light-receiving element are disposed at the lower part of a touch panel type display. The light-receiving element includes: a first light-receiving element disposed between a first light-emitting element and a second light-emitting element, and a second light-receiving element disposed between a third light-emitting element and a fourth light-emitting element. The measurement measures the detection level of the first light-receiving element when the first light-emitting element and the second light-emitting element emit light, and measures the detection level of the second light-receiving element when the third light-emitting element and the fourth light-emitting element emit light, respectively. In one embodiment, the display is disposed between the driver's seat and the passenger seat, with one side being the passenger seat side and the other side being the driver's seat side.

[0030] Invention Effects

[0031] According to the present invention, the estimated position estimated based on the measurement results of the measuring unit is corrected in such a way that the correction is greater as it is closer to the horizontal direction and smaller as it is closer to the opposite side. Therefore, it is possible to suppress false detection of objects approaching from one side to the other and to accurately estimate the horizontal position. Attached Figure Description

[0032] Figure 1 This represents an example of an existing proximity detection device. Figure 1(A) represents a configuration example of a display equipped with a proximity detection device. Figure 1 (B) is a diagram showing a detection example of an object being operated on near the detection device.

[0033] Figure 2 This diagram illustrates the timing of the driving of the light-emitting element and the light-receiving element in a conventional proximity detection device.

[0034] Figure 3 It is a diagram showing the detection level of the light-receiving element when the object being manipulated is moved horizontally.

[0035] Figure 4 It is a graph showing the detection level of the light-receiving element in one cycle when the object is close to position P1 and P2, and the estimated position calculated based on the distribution of the detection level.

[0036] Figure 5 This is a flowchart representing the estimated action of the horizontal position in an existing proximity detection device.

[0037] Figure 6 (A) represents an example of an operation performed near the driver. Figure 6 (B) represents an example of operation performed on the side furthest from the driver. Figure 6 (C) is a graph representing the detection level in one cycle when operating at a position far from the driver.

[0038] Figure 7 (A) represents a method for correcting the estimated position through mapping transformation. Figure 7 (B) represents an example of operating on the upper part of the screen. Figure 7 (C) is a diagram showing an example of an operation performed on the lower part of the screen.

[0039] Figure 8 (A) is a block diagram showing the electrical structure of a proximity detection device according to an embodiment of the present invention. Figure 8 (B) is a diagram showing the structure of the gesture determination function included in the control unit.

[0040] Figure 9 This is a flowchart illustrating the method for correcting the estimated position according to an embodiment of the present invention.

[0041] Figure 10 This is a graph illustrating the effect of the correction method in the embodiments of the present invention. Detailed Implementation

[0042] Next, embodiments of the present invention will be described. In one embodiment, the proximity detection device of the present invention includes a light-emitting element and a light-receiving element that receives reflected light from an object illuminated by light from the light-emitting element, optically detecting the presence or absence of an object's proximity. The light-emitting element is, for example, a directional light-emitting diode or a laser diode, and the light-receiving element is, for example, a photodiode or a phototransistor. One or more light-emitting elements and one or more light-receiving elements are integrally mounted around an electronic device or the like, detecting the proximity of a user's object to the electronic device. The electronic device equipped with the proximity detection device is not particularly limited, but the electronic device is, for example, a touch panel display. When the electronic device detects the proximity of a user's object, it detects, for example, a swipe gesture.

[0043] [Example]

[0044] Next, the proximity detection device according to an embodiment of the present invention will be described. Figure 8 This is a block diagram illustrating the electrical structure of a proximity detection device according to an embodiment of the present invention. The proximity detection device 100 of this embodiment includes a plurality of light-emitting elements 110, a plurality of light-receiving elements 120, a driving circuit 130 for driving the light-emitting elements 110, a measuring circuit 140 for measuring the light received by the light-receiving elements 120 of the reflected light, and a control unit 150 for controlling the entire proximity detection device 100.

[0045] Proximity detection device 100, for example, Figure 1 As shown in (B), the vehicle-mounted display 1 is equipped with a sensor that detects the proximity of the user's object to the display 1. The light-emitting element 110 includes LEDs 1 to 4 disposed at the lower part 3 of the display 1. The light-receiving element 120 includes a light-receiving element PD1 disposed between LEDs 1 and 2, and a light-receiving element PD2 disposed between LEDs 3 and 4. The driving circuit 130 is as follows... Figure 2 As shown, during the cycle, the light-emitting elements LED1 to LED4 are driven sequentially in a non-repeating manner. During the cycle, the measuring circuit 140 measures the detection level when the reflected light from LED1 is received by the light-receiving element PD1 (LED1→PD1), the detection level when the reflected light from LED2 is received by the light-receiving element PD1 (LED2→PD1), the detection level when the reflected light from LED3 is received by the light-receiving element PD2 (LED3→PD2), and the detection level when the reflected light from LED4 is received by the light-receiving element PD2 (LED4→PD2).

[0046] The control unit 150 determines whether an object is approaching the display 1 based on the measurement results of the measurement circuit 140, or estimates the horizontal position of the object based on the distribution of detection levels of the light-receiving elements PD1 and PD2 measured in a cycle, and determines a gesture operation such as sliding based on the estimation result. The control unit 150 may be part of a display controller that controls the display of the display 1, or it may be set independently of the display controller and operate in cooperation with the display controller. For example, when a sliding operation is detected by the control unit 150, the display controller can perform display control corresponding to the detection (e.g., display of a menu screen, display of a next page screen, etc.). The control unit 150 is implemented using hardware and software. The control unit 140 includes, for example, a microcontroller, microprocessor, memory, etc. containing ROM / RAM, and executes a program stored in ROM or memory.

[0047] The proximity detection device 100 in this embodiment is as follows: Figure 7 As illustrated in (C), it provides a way to reduce false detections when operating on the lower part of the screen of display 1 without increasing false detections. Figure 7 The means of assuming position error caused by reflected light from arm 4A when the driver operates on the passenger side of the upper part of the screen of display 1, as illustrated in (B).

[0048] Figure 8 Figure (B) shows the structure of the horizontal position estimation function 200 included in the control unit 150. The horizontal position estimation function 200 includes: a detection level determination unit 210, which determines whether a potential detection object exists on the front surface of the display 1 based on a measured detection level; a horizontal position estimation unit 220, which estimates the horizontal position of the detection object when the detection level determination unit 210 determines that a potential detection object exists; and an estimation position correction unit 230, which corrects the estimated position estimated by the horizontal position estimation unit 220. The estimation position correction unit 230 reduces... Figure 7 The error in the estimated position when the driver operates the screen at a position far away from the passenger side, as shown in (B) and (C).

[0049] Reference Figure 9 The flowchart shown illustrates the algorithm of the estimated position estimation function 200 in this embodiment. Figure 9 The flowchart steps S200~S230 and Figure 5 The steps S100~S130 of the flowchart are the same, and this embodiment also includes steps S240~S260.

[0050] The light-emitting elements LED1, LED2, LED3, and LED4 are driven sequentially by the driving circuit 130. Meanwhile, the detection levels of the light received by the light-receiving elements PD1 and PD2 are measured as measurement values ​​A1, A2, A3, and A4 by the measurement circuit 140 (S200). The detection level determination unit 210 calculates an index value V based on these measurement values ​​A1 to A4. This index value V is used to evaluate whether there is a detectable object sufficient for position determination (S210). The calculation of the index value V can, for example, be the maximum value of the measurement values ​​A1, A2, A3, and A4.

[0051] If the index value V exceeds the threshold (S220), the horizontal position estimation unit 220 determines that there is a meaningful detectable substance and calculates the estimated position G of the detectable substance using the above formulas (1) and (2) (S230). If the index value V is less than the threshold, no position estimation is performed, and the process returns to the next measurement.

[0052] If the index value V exceeds the threshold, the estimated position correction unit 230 further estimates the peak position P based on the measured values ​​A1 to A4 (S240). The peak position P determines the correction amount of the estimated position G, which, as described later, is variable through a weighting coefficient, increasing on the passenger side and decreasing on the driver side. The method for estimating the peak position P can also be simply set as the position of the largest measured value among the measured values ​​A1 to A4 (the position of the highest detection level). For example, if the measured value A1 is the largest, then the peak position P = 1; if the measured value A2 is the largest, then the peak position P = 2; if the measured value A3 is the largest, then the peak position P = 3; and if the measured value A4 is the largest, then the peak position P = 4. Alternatively, the second largest measured value adjacent to the largest measured value can be calculated, and a weighted average with the largest value can be obtained. For example, when the measured value A1 = 2000 is the largest and the measured value A2 = 700 is the second largest, the formula is obtained by weighting the horizontal coordinates x1 = 1 of the measured value A1 and x2 = 2 of the measured value A2.

[0053] P=(A1×[x1]+A2×[x2]) / (A1+A2),

[0054] We can calculate (2000×1+700×2) / (2000+700) = 1.26.

[0055] Next, the estimated position correction unit 230 determines the weighting coefficient w for correcting the estimated position G based on the peak position P obtained as described above (S250). Regarding weighting, if the light-emitting element closest to the driver's seat is set as LED4, the correction amount is weighted in such a way that the closer the estimated position G is to coordinate x1, the greater the correction. For example, if the weighting coefficient w for peak position P = 1 is set to 0.8 (w = 0.8), and the weighting coefficient w for peak position P = 4 is set to 0.2 (w = 0.2), and the intermediate weighting coefficients are obtained by linear interpolation, then in the example above (peak position P = 1.26), the weighting coefficient w is 0.75 (w = 0.75).

[0056] The estimated position correction unit 230 corrects the estimated position G based on the weighted peak position P and calculates the corrected position G' (S260). The corrected position G' is calculated by the following formula.

[0057] G' = (1-w)×G + w×P

[0058] In the first term [(1-w)×G] of the above formula, the closer to the driver's side, the larger the correction amount used to reduce the estimated position G. In the second term [w×P], the closer to the driver's side, the larger the correction amount used to increase the peak position P.

[0059] The estimated position G = 1.81 was obtained by calculating the center of gravity. The above calculation formula was then corrected to G' = (1-w) × G + w × P = 0.25 × 1.81 + 0.75 × 1.26 = 1.40. The corrected estimated position G' = 1.40 is close to the original estimated position of 1.33.

[0060] Figure 10 The diagrams illustrate examples of how the estimated position was corrected using the horizontal position estimation function 200 of this embodiment. Diagram (A) shows the estimated position obtained when sliding from the passenger side to the driver side at the top of the screen of display 1, and diagram (B) shows the estimated position obtained when sliding from the passenger side to the driver side at the bottom of the screen of display 1. The line indicated by ● represents the estimated position G calculated based on conventional center of gravity, and the line indicated by □ represents the estimated position G' corrected by this embodiment.

[0061] Figure 10 In the estimated position G based on center of gravity calculation in (A), when operating on the upper part of the screen, if the operation is towards the passenger side, the estimated position becomes higher due to the reflection from the arm (causing an error on the driver's side). In contrast, as can be seen from the corrected estimated position G' of this embodiment, the estimated position is suppressed to a lower level and corrected to be smooth.

[0062] Furthermore, it can be seen that in Figure 10In the operation at the bottom of the screen shown in (B), the original reflection of the arm has a small impact, so the correct position can be estimated even in the conventional calculation method. However, even with the correction in this embodiment, the corrected estimated position G' will not be excessively disturbed and will be close to the estimated position G, so the smooth estimated position is maintained.

[0063] Thus, according to the estimation position correction method of this embodiment, when operating on a screen at a position far from the driver's seat, when operating on the upper part of the screen, errors caused by reflections from the driver's arm are suppressed, and the estimation position after extreme correction is not distorted and the continuity is maintained smoothly. On the other hand, when operating on the lower part of the screen where the arm has less influence, the correction is not excessive, so false detections caused by air conditioning operation or other operations located at the lower part of the display are not caused, and sliding operations such as those that detect the user's intentions are detected.

[0064] Furthermore, according to the correction method of this embodiment, since it is not necessary to add hardware for operations to determine the upper or lower part of the screen, the cost increase of the proximity detection device can be substantially suppressed.

[0065] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to specific embodiments. Various modifications and alterations can be made within the scope of the spirit of the invention as described in the claims.

[0066] Explanation of reference numerals in the attached figures

[0067] 1: Monitor

[0068] 2: Center console

[0069] 3: Lower part

[0070] 4: Operation Object

[0071] 5: Illuminating light

[0072] 100: Proximity detection device

[0073] 110: Light-emitting element

[0074] 120: Light receiving element

[0075] 130 drive circuit

[0076] 140: Measurement Circuit

[0077] 150: Control Department.

Claims

1. A proximity detection device that uses a plurality of light-emitting elements and a light-receiving element to detect the approach of an object, wherein the light-receiving element receives reflected light from the plurality of light-emitting elements after it has been reflected by the object. The proximity detection device includes: The driving unit sequentially drives multiple light-emitting elements arranged in a straight line in the horizontal direction; The measuring unit measures the detection level of the light-receiving element when the plurality of light-emitting elements emit light sequentially; The estimation unit estimates the horizontal position of the object based on multiple measurement results from the measuring unit. as well as The correction unit corrects the estimated position determined by the estimation unit. The correction unit calculates the peak position of the detection level based on the measurement results of the measurement unit, and corrects the estimated position based on the calculated peak position in a manner that the closer the peak position is to the horizontal side, the greater the correction, and the closer the peak position is to the opposite side, the smaller the correction. The correction unit determines the weighting coefficient, which is a weighting coefficient that increases the correction amount based on the peak position the closer it is to one side, and decreases the correction amount based on the peak position the closer it is to the other side.

2. The proximity detection device according to claim 1, wherein, The estimation unit calculates the estimated position by calculating the centroid of the horizontal coordinates detected by the detection levels of the plurality of light-emitting elements and the multiple measurement results of the measurement unit.

3. The proximity detection device according to claim 2, wherein, The correction unit uses (1-w)×G+w×P to correct the estimated position, where w is the weighting coefficient, G is the estimated position, and P is the peak position.

4. The proximity detection device according to claim 1, wherein, The plurality of light-emitting elements and the light-receiving elements are disposed at the lower part of the touch panel type display. The light-receiving element includes: a first light-receiving element disposed between the first light-emitting element and the second light-emitting element; and a second light-receiving element disposed between the third light-emitting element and the fourth light-emitting element. The measuring section measures the detection level of the first light-receiving element when the first light-emitting element and the second light-emitting element emit light, and measures the detection level of the second light-receiving element when the third light-emitting element and the fourth light-emitting element emit light.

5. The proximity detection device according to claim 4, wherein, The display is positioned between the driver's seat and the front passenger seat, with one side being the front passenger side and the other side being the driver's side.

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