TW201500985A - Optical sensor array apparatus - Google Patents

Abstract

Disclosure is related to an optical sensor array apparatus. According to one embodiment of the invention, multiple sensor pixels are arranged as an array and forming a sensor array. Every comparator circuit is connected to one sensor pixel so as to calculate its energy state. A light source such as laser is installed in the apparatus. A control circuit is provided to recognize the sensor pixels' energy states for determining the spatial interference difference made by the reflected ray. The sensor array apparatus may be adapted to various surfaces since the light intensity and exposure time is able to be modulated as a compensation mechanism.

Description

Photosensor array device

The present invention relates to a photosensor array device, and more particularly to a sensor array device comprising a plurality of sensing elements arranged in an array.

The light sensor converts the received light into an electrical signal through a sensing element such as a CMOS (Complementary Metal Oxygen Half Field Effect Transistor) or a CCD (Charge Coupled Device), and the general technique can obtain the intensity of a specific light source through such a component. (Energy), from which the distance (as a distance sensor), the change in energy over time, and even the components captured by the image can be judged.

The optical pointing device, such as a computer mouse, can use the light sensor as a judgment of the trajectory movement. When the generated light is directed to a working plane, a moving vector can be judged by the energy change and image processing received before and after. As shown in FIG. 1 , the optical mouse 10 moves on a surface 11 , and the main components of the internal circuit of the mouse case 12 are provided with a circuit board 14 except for some optical components. The circuit board 14 is provided with a controller 18 for controlling and operating the emitted and sensed light, and a light source 16 and a sensor 19.

The outer casing 12 of the optical mouse 10 has a slot 17 facing the outer surface 11. The circuit board 14 is disposed near the aperture 17, and the circuit board 14 is provided with a laser or a light emitting diode. Light source 16 of the body (LED). When the optical mouse 10 is in operation, the light source 16 continuously generates emitted light and is directed toward the surface 11 at a specific angle, as indicated by a broken line in the figure, and the reflected light is obtained by the sensor 19, or the reflected light intensity is obtained. The image distribution of the degree (such as the sensor 19 can be a CMOS or CCD image sensor), the controller 18 analyzes the moving direction of the optical mouse 10.

In the aforementioned technique for determining the trajectory of the optical mouse 10, the signal of the reflected light obtained by the surface 11 is quite relied upon, and therefore the performance of the optical mouse 10 will generally be different depending on the form of the surface 11.

In the purpose of ray tracing, the general technique will cause a problem of failure of judgment due to a material having a transparent surface structure or a non-reflective material, resulting in failure to trace, which may make the related device (such as an optical mouse) unable to operate smoothly.

In the prior art, if the device for ray tracing still maintains certain tracing performance on different planes, additional external positioning sensing or some complicated operations are often used in the manner of obtaining the light moving path, but these positioning Sensing or operation is only applicable to finite planar states due to sensitivity limitations, high energy consumption, and complex algorithms. These conventional light sensors are not suitable for use on all highly reflective or very low reflectivity planes.

In view of the fact that conventional light sensors (such as optical mice) are not suitable for all high reflection or low reflectivity planes, the present disclosure proposes a light sensor array device through which It includes a plurality of sensing elements arranged in an array and corresponding tracking algorithms to achieve effective tracing. The embodiment can be matched with a light source with good spatial coherence such as laser light, thereby providing good tracking ability of a light tracing device such as an optical mouse. This method applies an image of light constructive and destructive interference between the surface reflected light and the original emitted light as a basis for tracking identification.

According to one embodiment, the main components of the photosensor array device have a plurality of sensing elements arranged in an array form to form a sensor array, and a plurality of sensing elements arranged in an array form are packaged in an integrated circuit. The sensor array is configured to receive light reflected from a surface, in particular, a plurality of germanium sensing elements are disposed therein. The device includes multiple comparisons Each of the comparators is connected to a sensor element, and the main purpose is to compare the two energy signals input, one of which is an energy signal generated by each sensor element, and the other is an energy signal outputted by all or part of the sensor elements. average value. The device further includes a light source device such as a laser that produces light that strikes a surface.

The device includes a control circuit for controlling the light source device to generate light, and obtaining energy signals of the plurality of sensing elements, and determining energy differences of spatial interference formed by surface reflection.

According to an embodiment, the main operation of the control circuit includes dynamically adjusting the exposure time of the light source device, and controlling the operation period of the pulse width modulation control signal to control the illumination period of the light source device, and dynamically adjusting the plurality of sensing element outputs. The gain of the energy signal may further include adjusting the light intensity generated by the light source device.

In order to further understand the technology, method and effect of the present invention in order to achieve the intended purpose, reference should be made to the detailed description and drawings of the present invention. The drawings and the annexed drawings are intended to be illustrative and not to limit the invention.

10‧‧‧ optical mouse

11‧‧‧ surface

12‧‧‧ Mouse shell

14‧‧‧ boards

18‧‧‧ Controller

16‧‧‧Light source

19‧‧‧ Sensor

17‧‧‧ slotting

201‧‧‧ incident light

205‧‧‧ surface structure

203‧‧‧ reflected light

30‧‧‧ boards

32‧‧‧Sensor array

301‧‧‧Feeling element

34‧‧‧Light source device

303‧‧‧Scope of illumination

36‧‧‧Control circuit

401, 402, 403, 404, 405 ‧ ‧ sensor elements

421,422,423,424,425‧‧‧ comparator

501‧‧‧Adder

502‧‧‧Gain Amplifier

503‧‧‧Calculator

Vout‧‧‧ output voltage

511,512,513,514,515,516‧‧‧傀儡

521,522,523,524‧‧‧ Sensing elements

Vsupply‧‧‧voltage source

601‧‧‧Light source device

602‧‧‧ Current Limiter

603‧‧‧ Current controller

604‧‧‧First Gain Controller

607‧‧‧Microprocessor

605‧‧‧ Analog Digital Converter

608‧‧‧second gain controller

606‧‧‧ parameters

609‧‧‧Comparative unit

60‧‧‧Light intensity signal

611,612,613,614‧‧‧ signal line

701, 702, 703, 704, 705, 706 ‧ ‧ sensor combination

Vavg‧‧‧Average voltage signal

X, Y‧‧ direction

T0‧‧‧ first time

T1‧‧‧ second time

801,802‧‧‧ sensor combination

1 shows a schematic diagram of an internal circuit of a conventional optical mouse; FIG. 2 shows a schematic diagram of a reflected light path of an incident plane and reflected light; and FIG. 3 shows a sense of being packaged in an integrated circuit in the photosensor array device of the present invention. FIG. 4 is a schematic diagram showing an embodiment of a sensor array used in the apparatus of the present invention; FIG. 5 is a schematic diagram showing a layout of a sensor element of the photosensor array device of the present invention; A block diagram of a gain control and a noise reduction circuit of a light source in an array device; FIG. 7 is a view showing an exemplary example of performing a light tracing method for each sensor element of the photosensor array device of the present invention; FIG. 8 shows a second exemplary example of performing a ray tracing method for each of the sensing elements in the photosensor array device of the present invention.

The present disclosure describes a light sensor array device, that is, a sensor array having sensor elements arranged in an array, one of the embodiments for receiving light reflected from a surface, and then according to a plurality of sensing elements The received reflected light energy determines a constructive or destructive interference image in the reflected light, and determines a moving vector by judging the energy change before and after the time. If applied to the light indicating device, the moving direction of the opposite surface can be determined. .

For example, if an optical mouse is used as an example, if the light source uses a coherent light or a spatial coherence light as a light source, the direction of movement can be detected and combined with sensitivity compensation. The method of sensitivity compensation utilizes a movement recognition algorithm and is capable of noise reduction, so that the device using this technique can be applied to various states of the plane.

It is worth mentioning that the photosensor array device proposed in the disclosure may adopt a coherent light source package integration, and devices using such technologies, such as optical indicating devices, do not need to install additional An optical lens or a specific image sensor, such as a complementary CMOS image sensor (CIS).

In view of the fact that conventional light sensors (such as optical mice) are not suitable for all high reflection or low reflectivity planes, the present disclosure proposes a light sensor array device through which A plurality of sensing wafers arranged in an array and corresponding tracking algorithms are included to achieve effective tracking. The embodiment can be matched with a light source with good spatial coherence such as laser light, thereby providing a good tracking ability for devices such as an optical mouse. The invention applies an image of constructive and destructive interference to the light reflected by the surface as a basis for tracking recognition.

Referring to FIG. 2, a specific light source device (not shown) generates a schematic diagram of incident light (201) incident on a plane and then reflected (203) to form a plurality of reflected light paths. Coherent light, as described herein, "coherent light" refers to a light with good spatial homology.

The plurality of optical paths shown in this figure include incident light 201 directed toward a plane having a surface structure 205, which is then reflected to form reflected light 203. Since the microscopic upper surface structure 205 is an irregular structure, the reflected light 203 forms light rays as shown schematically in different directions.

The light source device continuously generates incident light 201 to a plane, and reflects to form reflected light 203. In the process, the reflected light 203 is received through a sensor (not shown in the figure), and light constructive and destructive interference occurs in various optical paths. The pattern, where incident light from a coherent light source is used in particular, can enhance this interference effect.

When the device carrying the relevant circuit for performing the tracking method moves relative to the sensing plane (XY plane), the photo sensor receives the message of the reflected light 203 and collects according to the time slot (time slot) ( Sampling) The message data, as well as the average energy value (reflected light), and the energy difference at different times and positions. The photosensor array device disclosed in the present disclosure uses a sensor array to obtain energy at different positions, and a difference from an average energy value, that is, a movement trajectory can be determined. The average value can be calculated by using the statistical average of the energy obtained by all the sensing elements, or the average value of the energy obtained by the partial sensing elements, such as the average value or column of the row (as shown in the X direction of FIG. 5). The Y-direction) average is the calculation reference for the average; it is also possible to take the energy average of the peripheral or intermediate portion as the reference average.

According to one of the embodiments using the above-described sensor array, if the same dimming is used as the light source, the interference effect of the reflected light can be enhanced. The same dimming is a kind of light source with a very small phase delay in a wave envelope, wherein the laser light is a kind of dimming light, which is different from the dimming light such as sunlight or LED light.

In the photosensor array device disclosed in the present disclosure, the same dimming can improve the sensitivity of the optical sensor that senses the reflected light interference. Because the same dimming has a small phase difference characteristic, compared with the spatial interference caused by the non-coherent reflected light, the same dimming will have a small phase delay phenomenon. Therefore, the use of the same dimming can enhance the spatial interference of the reflected light, and the aforementioned sensor array (for the light) can obtain the spatial interference difference of the reflected light through one plane.

The sensor array can be referred to one of the embodiments of the sensor array packaged in an integrated circuit (IC) in the photosensor array device of the present invention shown in FIG. According to one embodiment of the invention, the sensor array and the associated controller circuit can be integrated in a semiconductor circuit, and the light source device of the light tracing device, the integrated sensor array and the controller can be packaged in the tracing device On a circuit board, therefore, the present invention does not require special optical acquisition devices, such as specific lenses and special semiconductor processes (such as CIS) to improve sensitivity.

The figure shows a sensor array 32 on a circuit board 30 within a light sensor array device, the light sensor array device device being applicable to an optical mouse or a particular pointing device, the sensor array 32 comprising an array The plurality of sensing elements 301 arranged in the package can be integrated into the integrated optical sensor array on the IC by the integrated package technology, including in one embodiment, simultaneously forming the sensor array 32 and the circuit integrated Controller 36. A plurality of sensing elements 301 (especially non-傀儡 sensing elements, as shown in FIG. 5) on the sensor array 32 have a fixed pitch and a uniform relative position to receive light reflected through a particular surface/plane on average. The illumination range 303 emitted by a light source device 34 to a plane is illustrated in the figure, and then the light is reflected by the plane and then directed to the sensor array 32, wherein each of the sensing elements 301 respectively receives reflected light in different directions. After the photoelectric signal conversion, the control circuit 36 and the related circuit in the device obtain the signal, and then calculate the average value of the energy received by each of the sensing elements 301, and then calculate the difference between each sensing element 301 and the average value, and the relevant control circuit. Spatial interference that is judged to be reflected by a surface or plane The spatial interference difference is determined by the control circuit 36 based on the energy difference accumulated before and after each time slot.

The photosensor array device disclosed in the above embodiments has a so-called spatial interference factor, and when light rays (especially the same dimming, but the invention is not limited to the same dimming), the surface is reflected on the surface having the irregular surface structure, and the reflection is generated in different directions. The interference caused by the reflected light, which is reflected to produce a constructive or destructive interference pattern, after which the space of the plane reflection due to the relative motion (relative motion of the device and the plane) is obtained by the sensor array. After the information, the mobile data is created on the XY plane.

In particular, in one embodiment, the carrier for applying the photosensor array device disclosed in the disclosure may be an optical indicating device that uses laser light as a light source, such as an optical mouse, wherein the main circuit components are disposed on a circuit board (30). a light source device (34) for generating light incident on the surface, comprising a sensor array (32) having a plurality of sensing elements (301) arranged in an array, and including the foregoing control circuit (36) The control circuit (36) is coupled to the light source device (34) and the sensor array (32) for acquiring optical signals received by the plurality of sensing pixels in the plurality of sensing elements (301), and calculating energy State, and the change in energy state before and after the acquisition time.

4 is a schematic diagram showing an embodiment of a sensor array operation calculation energy distribution employed by the photosensor array device.

Figure 4 shows the layout of the sensor array. A plurality of sensing elements are distributed on the XY plane to form an NxM sensor array. The sensor array is in the form of a symmetrical rectangular, square, circular, elliptical, etc. Geometric shape, which can be determined according to the actual application. The sensor array includes a plurality of sensing elements 401, 402, 403, 404, 405 arranged in an array, respectively disposed along the directions X, Y, and the actual number is not limited to this schematic. The main components on the circuit board on which these sensing elements 401, 402, 403, 404, 405 are laid are also a plurality of comparators 421, 422, 423, 424, 425. Each comparator is connected to a sensing element, and the input value is the average voltage signal Vavg of the energy generated by each sensing element for comparing the sensing element sensing. The voltage signal obtained after reaching the light can be compared high. Low voltage signal value. Finally, the control circuit obtains the comparison result of the adjacent two sensor values and makes a judgment of the moving direction.

For example, the comparator 421 is coupled to the sensing element 401. One of the input signals, that is, the energy signal generated by the sensing element 401, can be represented by a voltage signal, and the other input terminal is an average voltage signal Vavg, so the comparator 421 is compared. The two input signals can output a comparison result. The present invention preferably expresses the comparison result by a binary characteristic value, such as the high and low voltage signals respectively indicated by H or L in FIG.

According to the photosensor array device disclosed in the disclosure, the manner of tracking by the sensor array is characterized by the display in the constructive and destructive interference pattern formed by the light reflection (preferably the same dimming) through the plane reflection. The energy pattern determines the motion vector through changes in energy distribution at different times. The implementation method uses, for example, a non-relative view points to do movement judgment, that is, introducing energy information of the surrounding sensing elements, and comparing the average inductive energy to determine the moving direction. It is worth mentioning that this is different from the general method of judging the motion vector by using pixel information. The present invention determines the movement trajectory by using time and calculation energy changes, and the energy change can adopt a binary eigenvalue. (eg, H and L), this binary eigenvalue is a comparison of the readings of the sensing elements with the statistical average.

In the photosensor array device itself, according to one of the embodiments, in the sensing wafer layout of the photosensor array device of the present invention, the sensing chip includes sensing elements arranged in an array, and the sensing elements may include a surrounding effect. The sensing element (called the 傀儡 sensing element) and the working sensing element located in the central part responsible for receiving the light, so that the control circuit or the related computing circuit in the front beam device obtains the energy signal of all the sensing elements, and only captures The energy signal of the non-傀儡 sensing element continues to be used. See Figure 5 for a schematic diagram of the sensor layout.

This figure shows a sensor chip with a plurality of sensor elements arranged in an array. This example shows a sensor (dummy) on the periphery of the sensor element in the center. The purpose of the sensor is to make the entire inductive wafer process more uniform, and thus to make the sensor energy more uniform. The embodiment shows that the surrounding sensing elements 511, 512, 513, 514, 515, 516 are set as inactive sensing elements, and the sensing elements 521, 522, 523, 524 disposed near the intermediate portion are sensing elements that primarily sense light energy.

When an array of array elements is simultaneously exposed to a reflected light, the sensing element capable of uniformly sensing the light is a sensing element that is more biased toward the central portion, and the surrounding sensing elements may have the possibility of receiving uneven energy. Therefore, when the total energy received by the entire sensing chip is added, the energy values of the signal instability may be excluded by setting the sensing elements (511, 512, 513, 514, 515, 516), and a reference energy value having a reference value can be obtained.

As shown in the figure, the circuit is provided with an adder 501 electrically connected to each of the sensing elements in the sensing chip to obtain photocurrent signals of the respective sensing elements, and can be converted into voltage values by analog digital conversion, but due to the sensing chip The photocurrent of each of the sensing elements receiving the optical signal is extremely small, and it is necessary to pass the stage of gain amplification to obtain an effective reference value, and then to calculate the energy change obtained before and after the acquisition time. According to an embodiment, the photocurrent signals are processed by the gain amplifier 502 to form an output signal, such as a signal represented by the output voltage Vout. In addition, a calculator 503 calculates an average output according to the effectively obtained energy signal, and outputs an average value. Voltage signal Vavg.

Thereafter, the output signal (such as the output voltage Vout) and the average value (such as the average voltage signal Vavg) are output to the comparator as disclosed in FIG. 4, so that the comparator can compare the energy signal of the sensing element with a reference value (eg, The energy average of all or part of the sensing elements, thereby obtaining the energy state of the sensing element. In fact, each sensing element can represent the energy state in a digital manner with high (H) and low (L).

The main components in the photosensor array device are integrated with the gain amplifying circuit (such as the gain amplifier 502) for amplifying the signal and may be required in addition to the aforementioned sensing elements, light sources and control circuits arranged in an array form. For the noise reduction circuit and the like, the embodiment can refer to the gain control of the light source in the photosensor array device of the present invention shown in FIG. System and noise reduction circuit block diagram.

The circuit shown in the figure is one of the embodiments for implementing the control circuit (such as the control circuit 36 of FIG. 3) in the light sensing array device of the present invention. The control circuit is provided with a voltage source Vsupply for supplying the light source device in the light sensor array device. The power required for the operation of the 601 is powered by the light source device 601 to drive the illumination, and is not limited to a laser or a light-emitting diode (LED). Among them, the laser is a preferred light source because of its good spatial coherence, which can enhance the interference effect.

A current limiter 602 can be disposed on the circuit, and the related electrical signal can control the power supplied to the light source device 601 through a certain process, or can feed back related electrical signals (such as filtering a specific voltage or current signal) to the current controller 603. The current controller 603 functions as a voltage and current for the light source device 601, and includes a current limit driven by the light source device 601.

When light is emitted from the light source device 601 to a surface, the light reflected from the surface is received by the sensor array disclosed in the present disclosure, and is received by the sensing element in the photosensor array device disclosed in FIG. 4 or FIG. For energy signals.

Referring to the sensor array shown in FIG. 5 above, there are some 傀儡 sensing elements, which do not provide the energy signal as the motion vector, including the energy state and the change signal, but can be used as a pure judgment. The function of the optical signal. In such an embodiment, the light intensity signal 60 generated by the receiving element receiving the reflected light is adjusted by the first gain controller 604 in the circuit for reference by the internal microprocessor 607. When the output voltage Vout is obtained by the light intensity signal 60 generated by the sensing element, the signal can be processed by an appropriate analog-to-digital converter 605 to convert the electrical signal into a digital signal, which is fed back to the microprocessor 607 for the purpose of including the light source. The exposure time of the device 601, the signal gain adjustment of the energy signals output by the plurality of sensing elements, and noise cancellation.

The above-mentioned signal strength is fed back to the microprocessor 607, one of the purposes of which is to automatically adjust the exposure time adjustment of the light source device 601 in the photosensor array device. For example, the microprocessor 607 sends a pulse width modulation (PWM) control signal. To the current controller 602, for example, the control signal is transmitted via the signal line 611, and the lighting cycle of the light source device 601 is controlled by controlling the duty cycle of the pulse width modulation control signal to control the device through the exposure time adjustment. Generate an optical signal of appropriate length of time.

In another embodiment, the microprocessor 604 in the control circuit can make a measure for optimizing the light source device 601 according to the light intensity signal obtained by the device, for example, transmitting the current control signal to the current controller 603 via the signal line 612, thereby adjusting By driving the current, the light intensity generated by the light source device 601 can be adjusted. Accordingly, by adjusting the intensity/brightness of the light source and the compensation mechanism established by the adjustment of the aforementioned exposure time, the sensor array device can adapt to more surface conditions, such as different surface structures, distances from the surface, and the like.

In addition, the microprocessor 607 in the control circuit can further control the signal gain output by each sensing element according to the energy signal fed back by the sensor array, such as transmitting the control signal via the signal line 613, and controlling the sensing elements through the gain controller 608. The signal gains and the comparison unit 609 electrically connected to each of the sensing elements compares the energy signals received by the sensing elements with a reference average.

After the microcontroller 607 obtains the light intensity signal obtained by the sensing element, the noise cancellation threshold set in the comparing unit 609 can be adjusted (the control signal is transmitted via the signal line 614) to dynamically reduce the noise of the sensing element. .

The photo sensor array device applies different time energy change judgment devices and the relative movement direction of the surface, and the device first obtains the energy received by each sensor element in the front and rear time (t0, t1), and then calculates all or part of the sensor elements of the time energy before and after. The average value of the received energy, the energy value obtained by each sensor element at different times (represented by the voltage signal) is compared with the average value, and the energy change of the time before and after can be calculated. Then, referring to the energy change of the adjacent sensing elements at different times (t0, t1), the direction of the energy change before and after can be judged. Finally, the overall motion vector can be judged by the direction of energy change of the majority of the sensing elements.

The judgment of performing the motion vector using the foregoing two-bit acquisition imaging can be referred to FIG. 7 Exemplary examples of ray tracing are performed by a plurality of sensing elements in the apparatus of the present invention.

This example shows a plurality of arrays of sensing element combinations 701, 702, 703, 704, 705, 706. This example only illustrates the identification of the moving vector by the energy changes sensed by the adjacent sensing elements at different times (eg, the first time t0, the second time t1). example.

Where t0 and t1 are the two sampling times before and after, and H and L respectively represent the high and low voltage signals output by the aforementioned comparator, that is, can be regarded as the energy state (the energy state can be binary characteristic compared to the average energy being an energy state) The value indicates), mainly by determining the overall motion vector through the voltage signal transition of the time before and after. Figure 7 shows the energy changes in the individual sensing elements at two different times before and after.

For example, the sensing element combination 701 schematically displays several (at least two) sensing elements, wherein the left side is displayed at the first time t0, the two sensing elements respectively sense two energy states of L and H; when entering the second time t1 At the same time, the energy changes of the two sensing elements are converted into H and H. When L and H(t0) are converted to H and H(t1), the energy state of the sensing element is changed from L to H, indicating that the right side H is substituted to the left position, so the initial collection time can be determined. The direction of effective sensing in the middle is leftward.

The other group of sensing elements of the sensing element combination 701 has an energy state of H and L at the first time t0; and an energy state of L and L at the second time t1, wherein the energy state of the sensing element is H The transition to L also indicates that the L substitute on the right is at the left position, so it can be judged that there is a leftward moving direction.

For example, if the two sensing elements on the left side of the sensing element combination 702 have L and H energy values at the first time t0, and the second time t1 changes to L and L, it can be seen that the H direction of the left side is L. The right substitute becomes L, so it is initially determined that there is a rightward moving vector.

Similarly, the right side of the sensing element combination 702 has two sensing elements whose energy states are H and L at the first time t0, and then changes to H and H at the second time t1, wherein the right L passes to the left. The H substitute is converted to H, so it can be judged that there is a rightward moving vector.

In the figure, the sensor combination 705 and 706 have no arrow indicating the direction, and it is judged as In this example, the plurality of sensing elements have no energy change during the acquisition time of the first time t0 and the second time t1, or the moving direction cannot be determined through the change of the energy therein, for example, the energy state of the sensing element combination 706 at the first time t0 is L and H, at the second time t1, the energy state is changed to H and L, which is impossible to determine the moving direction through the change of the energy state. Therefore, these two aspects have no valid output signal.

When all the sensing elements of the last two times judge the direction of the respective energy changes, an overall motion vector can be determined as a whole.

Another way of judging the direction of movement is as shown in FIG. 8 , which is a schematic diagram of performing ray tracing on the sensing wafer in the device disclosed in the present invention. In this example, a schematic diagram of a method for recognizing a motion vector by changing the direction of the inductive meta-energy state at different times, where X is an unintentional value, @ is an alignment of the signals sensed by t0 and t1, thereby judging the motion vector.

When the reflected light is received by the sensing chip, the plurality of sensing elements in the sensing chip generate different high and low voltage signals according to the received signal energy and the average energy at different times. In this example, the sensing signal "@" is generated. In some cases, it is still possible that some of the sensing elements have no energy change, or that there is no difference in the voltage signal. At this time, the value shown as "X" is not shown.

According to the embodiment of the figure, in the sensing element combination 801, the energy change of the adjacent sensing element is obtained by the comparator at the first time t0, and is expressed as a state "X@@", wherein "X" is an unintentional value. "@" indicates that there is a high and low voltage change; at the second time t1, the energy change of several adjacent sensing elements is obtained, which is expressed as the state "@@X". The energy state of each sensor element at the first time t0 and the second time t1 changes, and in this example, the display state "X@@" is changed to "@@X", and it can be judged that "@@" is shifted to the left (shift), so It can be judged that this sensor element combination 801 has a change to the left movement as indicated by the arrow in the figure.

In the sensing element combination 802, the energy change of the adjacent sensing element at the first time t0 is represented as the state "@@X", and at the second time t1, the energy state is represented as "X@@", which is visible After the time transition (t0 to t1), the state "@@" The trend shows a shift to the right. Therefore, the invention disclosed in the present disclosure can determine the moving direction of the overall device by utilizing the energy change before and after the time.

It is worth mentioning that when the direction of movement is judged, since the invention adopts the sensor array, the slight error does not affect the result of the overall judgment. If the tracing method is applied to a computer optical mouse, the moving frequency of the general user operating the mouse is much lower than the processing speed of the control circuit, and some slowly changing reference values do not affect the overall judgment.

In summary, the present invention relates to a photosensor array device integrated in a semiconductor package, thereby effectively suppressing internal intrinsic noise and suggesting that The compensation mechanism established by dynamically adjusting the intensity or brightness of the light source and adjusting the exposure time allows the sensor array device to adapt to more sensing surfaces.

However, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, equivalent structural changes that are made by using the specification and the contents of the present invention are equally included in the present invention. Within the scope, it is combined with Chen Ming.

401, 402, 403, 404, 405 ‧ ‧ sensor elements

421,422,423,424,425‧‧‧ comparator

Vavg‧‧‧Average voltage signal

X, Y‧‧ direction

Claims (13)

An optical sensor array device includes: a plurality of sensing elements arranged in an array form, forming a sensor array, wherein a plurality of sensing elements are disposed, the sensor array is configured to receive light reflected from a surface; a plurality of comparators, each of the comparators is connected to a sensing element for comparing the two energy signals input, one of which is an energy signal generated by the sensing element, and the other is a statistical average; a light source device is used to generate a light incident on the surface; and a control circuit electrically connected to the plurality of sensing elements, the plurality of comparators and the light source device for controlling the light source device to generate the light, and obtaining energy signals of the plurality of sensing elements And determine the energy difference of the spatial interference formed by the surface reflection. The photosensor array device of claim 1, wherein the plurality of sensing elements have a fixed pitch and an average relative position. The photosensor array device of claim 2, wherein the plurality of sensing elements arranged in the array form are packaged in an integrated circuit. The photosensor array device of claim 1, wherein the control circuit dynamically adjusts an exposure time of the light source device. The photosensor array device of claim 4, wherein the light source device is a light source having good spatial coherence. The photosensor array device of claim 4, wherein the light source device is a laser. The photosensor array device of claim 5, wherein the control circuit controls the illumination period of the light source device by controlling a duty cycle of the pulse width modulation control signal. The optical sensor array device of claim 1, wherein the control circuit dynamically adjusts the gain of the energy signals output by the plurality of sensing elements. The photosensor array device of claim 8, wherein the control circuit controls the signal gain of each of the sensing elements according to an energy signal fed back by the sensor array composed of the plurality of sensing elements. The photosensor array device of claim 8, wherein the control circuit receives only the energy signals of all or part of the non-傀儡 sensing elements after receiving the energy signals of the plurality of sensing elements, Calculate the statistical average. The photosensor array device of claim 1, wherein the control circuit adjusts a light intensity generated by the light source device. The photosensor array device of claim 11, wherein the control circuit adjusts a driving current of the light source device according to a light intensity signal obtained by the plurality of germanium sensing elements to adjust the light source device brightness. The photosensor array device of claim 12, wherein the 傀儡 sensing element is disposed around the sensor array.