Detection device

Abstract

To provide a detection device that can increase detection accuracy of color.SOLUTION: A detection device comprises: a sensor panel having a detection region in which a plurality of photosensors is two-dimensionally arranged; a light source part in which multiple kinds of light sources which severally emit light having different colors are provided; a member which is provided such that a body to be detected can be installed so as to interpose the body to be detected between the detection region and the light source part; and a detection circuit which obtains output of the photosensors. The photosensor includes a photodiode, an output corresponding to a photocurrent generated correspondingly to light detected by the photodiode is obtained, the light sources which emit light having different colors are not turned on simultaneously but turned on in different periods, exposure time when the photosensor detects light is different for each of the light sources which emit light having different colors, and an output of the photosensor under a condition that the body to be detected is not installed is within an output range corresponding to a predetermined target value regardless of a color of light emitted from the light source turned on.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present disclosure relates to a detection device.

Background Art

[0002] There is known a detection device that enables an optical sensor to detect the state of a culture environment of biological tissue or microorganisms (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described detection device, by providing light sources of a plurality of colors and performing detection for each color of light, color information can be taken into account in the detection result. However, there may be variations in the luminance of the light sources. Therefore, if detection is performed without considering such variations in luminance, the tint caused by the variations in luminance will be reflected in the detection result, reducing the detection accuracy of the color of the culture environment of the biological tissue or microorganisms that are the detection target.

[0005] The present disclosure has been made in view of the above problems, and an object thereof is to provide a detection device capable of further improving the detection accuracy of color.

Means for Solving the Problems

[0006] A detection device according to one aspect of the present disclosure includes a sensor panel having a detection region in which a plurality of optical sensors are two-dimensionally arranged, a light source unit provided with a plurality of types of light sources that emit light of different colors, a member provided so that a detection object can be installed so that the detection object is interposed between the detection region and the light source unit, and a detection circuit that obtains outputs of the plurality of optical sensors. The optical sensor includes a photodiode, and an output corresponding to a photocurrent generated in response to the light detected by the photodiode is obtained. The light sources that emit light of different colors do not light up simultaneously but light up in different periods. The exposure time during which the optical sensor detects light is different for each of the light sources that emit light of different colors. The output of the optical sensor under the condition that the detection object is not installed is within an output range corresponding to a predetermined target value regardless of the color of the light emitted by the lit light source.

Brief Description of the Drawings

[0007]

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DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, each embodiment of the present disclosure will be described with reference to the drawings. Note that the disclosure is merely an example, and for those that can be easily conceived by those skilled in the art with appropriate modifications while maintaining the gist of the invention, they are naturally included in the scope of the present disclosure. Also, for the purpose of making the description clearer, the drawings may schematically represent the width, thickness, shape, etc. of each part compared to the actual aspect, but this is merely an example and does not limit the interpretation of the present disclosure. Further, in this specification and each figure, elements that are the same as those described above with respect to the previously shown figures may be given the same reference numerals, and detailed descriptions may be omitted as appropriate.

[0009] (Embodiment) FIG. 1 is a diagram showing the main configuration of the detection device 1. The detection device 1 includes a sensor panel 10, a light source panel 20, and a control circuit 30. The sensor panel 10 and the light source panel 20 of the detection device 1 are connected to the control circuit 30.

[0010] The sensor panel 10 has a detection region SA (see FIG. 2) provided on the substrate 11. Also, a reset circuit 13, a scanning circuit 14, and a wiring region VA are mounted on the substrate 11. The configuration on the detection region SA, the reset circuit 13, and the scanning circuit 14 are connected to the detection circuit 15 via the wiring region VA.

[0011] The light source panel 20 has a light emitting region LA that irradiates the detection region SA with light. The light source panel 20 has a light source unit 22 provided on the substrate 21. The light source unit 22 has a light emitting element such as an LED (Light Emitting Diode), for example, and is arranged within the light emitting region LA. In the example shown in FIG. 1, a plurality of light source units 22 are arranged in a matrix on the substrate 21.

[0012] The light source panel 20 is provided with a light source drive circuit 23. The light source drive circuit 23 performs control of the lighting and non - lighting of each of the plurality of light source units 22 and the luminance control during lighting under the control of the control circuit 30. The plurality of light source units 22 may be provided so as to be individually light - emission controllable, or may be provided so as to emit light collectively.

[0013] The control circuit 30 performs various controls related to the operation of the detection device 1. Specifically, the control circuit 30 is a circuit capable of implementing a plurality of functions, such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit), for example. The control circuit 30 is connected to the detection circuit 15 via the wiring section 19 and obtains the output from the detection circuit 15. Further, the control circuit 30 is connected to the light source drive circuit 23 via the wiring section 29, and performs processing related to the lighting of the light source section 22, such as individual lighting control of light sources (for example, the first light source 22R, the second light source 22G, and the third light source 22B) that emit lights of different colors included in the light source section 22.

[0014] FIG. 2 is a diagram showing a configuration example of the detection region SA and the wiring region VA. A plurality of optical sensors WA (see FIG. 3) are provided in the detection region SA. In the embodiment, as shown in FIG. 2, a plurality of optical sensors WA are arranged in a matrix along the first direction Dx and the second direction Dy. The first direction Dx and the second direction Dy are orthogonal to each other. Further, when described as the third direction Dz in the following description, it refers to a direction orthogonal to the first direction Dx and the second direction Dy.

[0015] The reset circuit 13 is connected to the reset signal transmission lines 51, 52, ···, 5n. Hereinafter, when described as the reset signal transmission line 5, it refers to any one of the reset signal transmission lines 51, 52, ···, 5n. The reset signal transmission line 5 is a wiring along the first direction Dx. In the example shown in FIG. 2, n reset signal transmission lines 5 are arranged in the second direction Dy. n is a natural number of 2 or more. Such n reset signal transmission lines 5 are connected to the reset circuit 13 on one end side in the first direction Dx.

[0016] The scanning circuit 14 is connected to the scanning lines 61, 62, ···, 6n. Hereinafter, when described as the scanning line 6, it refers to any one of the scanning lines 61, 62, ···, 6n. The scanning line 6 is a wiring along the first direction Dx. In the example shown in FIG. 2, n scanning lines 6 are arranged in the second direction Dy. Such n reset signal transmission lines 5 are connected to the scanning circuit 14 on the other end side in the first direction Dx.

[0017] As shown in FIG. 2, the reset signal transmission line 5 and the scanning line 6 are alternately arranged in the second direction Dy within the detection region SA. Note that although the reset circuit 13 and the scanning circuit 14 illustrated in FIGS. 1 and 2 are arranged at positions facing each other with the detection region SA therebetween, the layouts of the reset circuit 13 and the scanning circuit 14 are not limited thereto and can be changed as appropriate.

[0018] Also, within the detection region SA, signal lines 71, 72, ···, 7m are provided. Hereinafter, when referring to the signal line 7, it refers to any one of the signal lines 71, 72, ···, 7m. The signal line 7 is a wiring along the second direction Dy.

[0019] In the example shown in FIG. 2, m signal lines 7 are arranged in the first direction Dx. m is a natural number of 2 or more. Each of the m signal lines 7 is connected to any one of a plurality of switches (for example, switch SW1, switch SW2, switch SW3, or switch SW4) that the multiplexer 40 has at one end side in the second direction Dy.

[0020] The multiplexer 40 is provided within the wiring region VA. The multiplexer 40 has a plurality of switches. In the example shown in FIG. 2, switches SW1, SW2, SW3, and SW4 are shown as the plurality of switches. The plurality of switches that one multiplexer 40 has become ON (conducting state) at different timings. During the period when one of the plurality of switches that one multiplexer 40 has is ON (conducting state), the other switches are OFF (non-conducting state). The number of multiplexers 40 corresponds to the number (m) of signal lines 7. If the number of switches is p, the number of multiplexers 40 is sufficient if it is m / p. When there are a plurality of multiplexers 40, the plurality of multiplexers 40 are each connected to the detection circuit 15 via individual wirings 401, 402, ···, 40p.

[0021] Note that the connection between the signal line 7 and the detection circuit 15 via the multiplexer 40 is merely an example and is not limited thereto. The signal line 7 may be directly connected to the detection circuit 15 individually within the wiring area VA. Within the wiring area VA, the reset circuit 13 is connected to the detection circuit 15 via the wiring 131. Within the wiring area VA, the scanning circuit 14 is connected to the detection circuit 15 via the wiring 141.

[0022] The detection circuit 15 is related to the detection of light by the PD82 (see FIG. 3) provided in the optical sensor WA, and controls the operation timings of the reset circuit 13 and the scanning circuit 14. Also, the output from the optical sensor WA is input to the detection circuit 15. The output of the optical sensor WA corresponds to the output of the PD82 provided in the optical sensor WA. The detection circuit 15 converts the signal input from the optical sensor WA into data interpretable by the control circuit 30 and outputs it to the control circuit 30. Note that the detection circuit 15 in the embodiment is an MCU (Micro Controller Unit).

[0023] FIG. 3 is a circuit diagram showing the circuit configuration of the optical sensor WA. Note that the first direction Dx and the second direction Dy in FIG. 3 merely correspond to the directions of the reset signal transmission line 5, the scanning line 6, and the signal line 7, and do not strictly show the relative positional relationship of the circuit configuration within the optical sensor WA.

[0024] As shown in FIG. 3, a switching element 81, a PD82, a transistor element 83, and a switching element 85 are provided in the optical sensor WA. The PD82 is a photodiode (PD: PhotoDiode). The switching elements 81, 85, and the transistor element are MOSFETs (Metal Oxide Semiconductor Field Effect Transistors).

[0025] The gate of the switching element 81 is connected to the reset signal transmission line 5. A reset potential VReset is applied to one of the source or drain of the switching element 81. To the other of the source or drain of the switching element 81, the cathode of the PD82 and the gate of the transistor element 83 are connected. Hereinafter, when referred to as the connection part CP, it refers to the location where the other, the cathode of the PD82 and the gate of the transistor element 83 are connected. Also, a reference potential VCOM is applied from the anode side of the PD82. The potential difference between the reset potential VReset and the reference potential VCOM is predetermined, but the potentials of the reset potential VReset and the reference potential VCOM may be variable. Note that the reset potential VReset is a potential higher than the reference potential VCOM.

[0026] An output source potential VPP2 is applied to the drain of the transistor element 83 that functions as a source follower. To the source of the transistor element 83, one of the source or drain of the switching element 85 is connected. The other of the source or drain of the switching element 85 is connected to the signal line 7. The gate of the switching element 85 is connected to the scanning line 6.

[0027] The reset potential VReset, the reference potential VCOM, and the output source potential VPP2 are supplied, for example, based on the power supplied through a power supply circuit (not shown) connected to the detection circuit 15, by the detection circuit 15 to the optical sensor WA, but are not limited thereto and can be changed as appropriate.

[0028] The output source potential VPP2 is predetermined. Also, the potential on the source side of the transistor element 83 becomes a potential that is lower than the output potential of the PD82 by the voltage (Vth) between the gate and source of the transistor element 83. In this case, the potential on the source side of the transistor element 83 corresponds to the potentials of the reset potential VReset and the reference potential VCOM. The potential of the output of the PD82 corresponds to the photovoltaic power generated by the PD82 in response to the light detected by the PD82 during the exposure time (for example, the first exposure time TR, the second exposure time TG, and the third exposure time TB shown in FIG. 10) described later.

[0029]

[0029] As described above, in the embodiment, the optical sensor WA includes the PD82, and a photocurrent generated in response to the light detected by the PD82 is accumulated as a capacitance in the optical sensor WA (for example, the connection portion CP), and the detection circuit 15 acquires an output generated by the charge corresponding to the capacitance. A configuration is adopted.

[0030]

[0030] When the gate of the switching element 85 is turned on by a signal supplied from the scanning circuit 14 via the scanning line 6, the source-drain of the switching element 85 becomes conductive. As a result, the signal (potential) transmitted to the switching element 85 via the transistor element 83 is transmitted to the signal line 7 through the switching element 85. In this way, an output from the optical sensor WA is generated. Hereinafter, when referred to as a read signal, it refers to a signal (potential) supplied from the scanning circuit 14 via the scanning line 6. The scanning circuit 14 is a circuit that outputs a read signal.

[0031]

[0031] The output of one PD82 provided in one optical sensor WA corresponds to the intensity of the light detected by the PD82 during the exposure time. The output of the PD82 is reset in response to a signal (reset signal) supplied from the reset circuit 13 via the reset signal transmission line 5. When the gate of the switching element 81 is turned on by the signal, the source-drain of the switching element 81 becomes conductive. As a result, the potential of the connection portion CP is reset to the reset potential VReset.

[0032] Next, an operation mode of the detection device 1 will be described with reference to FIG. 4. FIG. 4 is a schematic diagram showing an operation mode of the detection device 1. The detection device 1 is provided such that the light source panel 20 and the sensor panel 10 face each other in the third direction Dz with the object to be detected SUB interposed therebetween. The object to be detected SUB is, for example, a Petri dish in which a culture medium is formed.

[0033] In the embodiment shown in FIG. 4, a radiation limiting member 50 is interposed between the object to be detected SUB and the sensor panel 10. The radiation limiting member 50 is a member that limits the path of the light LV irradiated from the light source panel 20 toward the sensor panel 10 and reaching the sensor panel 10. Specifically, the radiation limiting member 50 is, for example, a plate-like member having a plurality of through-holes in the third direction Dz. The light that can pass through the radiation limiting member 50 is limited to the light passing through the through-holes. The through-holes correspond to the arrangement of the light source portions 22 provided in the sensor panel 10. The through-holes are provided so that each PD82 does not simultaneously detect light from two or more light source portions 22. That is, in the embodiment, the light detected by one PD82 is the light from one light source portion 22. Note that the through-holes are not provided individually for each PD82 but are shared by a plurality of PD82. Therefore, the light from one light source portion 22 is shared by a plurality of PD82. The light LV is the light R1, light G1, or light B1 described later.

[0034] The object to be detected SUB is placed on the radiation limiting member 50 and within the detection region SA. The light source panel 20 irradiates light from above the object to be detected SUB toward the sensor panel 10 when the light source portions 22 are lit. Among the light emitted from the light source portions 22 and traveling toward the object to be detected SUB, the light that has passed through the object to be detected SUB and the radiation limiting member 50 is detected by the PD82 (see FIGS. 3 and 4) within the detection region SA. Hereinafter, when referred to as sensor scanning, it refers to the process in which the sensor panel 10 detects the light from the light source panel 20 in a state where the positional relationship among the light source panel 20, the object to be detected (for example, the object to be detected SUB), the radiation limiting member 50, and the sensor panel 10 as shown in FIG. 4 is established.

[0035] In the embodiment, when the object to be detected SUB is interposed between the sensor panel 10 and the light source panel 20, further, a radiation limiting member 50 is interposed between the object to be detected SUB and the sensor panel 10. However, the radiation limiting member 50 is not an essential component, and other optical members having the same function as the radiation limiting member 50 may be employed, or the radiation limiting member 50 may be omitted.

[0036] Under the setting conditions described with reference to FIG. 4, sensor scanning is performed by detecting the light from the light source unit 22 with the PD 82. Hereinafter, when referred to as sensor scanning, it refers to the process of detecting the light irradiated from the light source panel 20 with the sensor panel 10.

[0037] FIG. 5 is a schematic diagram showing a configuration example of the light source unit 22. The light source unit 22 is provided with a plurality of types of light sources that emit light of different colors. Specifically, as shown in FIG. 5, the light source unit 22 of the embodiment includes a first light source 22R, a second light source 22G, and a third light source 22B. The first light source 22R, the second light source 22G, and the third light source 22B are light emitting elements (for example, LEDs) that emit light of different colors. In the embodiment, the first light source 22R emits red (R) light. The second light source 22G emits green (G) light. The third light source 22B emits blue (B) light.

[0038] Note that in the light source unit 22 shown in FIG. 5, the longitudinal directions of the first light source 22R, the second light source 22G, and the third light source 22B are along the second direction Dy, and the first light source 22R, the second light source 22G, and the third light source 22B are arranged in this order from one side to the other side in the first direction Dx. However, this is an example of the form of the light source unit 22 and is not limited thereto. The shapes of the first light source 22R, the second light source 22G, and the third light source 22B in the plan view of the light source unit 22 and the positional relationship between the first light source 22R, the second light source 22G, and the third light source 22B can be changed as appropriate.

[0039] FIG. 6 is a schematic diagram showing the lighting pattern of the light source unit 22 in sensor scanning. As described with reference to FIG. 4, when the object to be detected SUB is located between the sensor panel 10 and the light source panel 20, among the lights from each of the first light source 22R, the second light source 22G, and the third light source 22B, the light that reaches the sensor panel 10 depends on the color of the object to be detected SUB.

[0040] For example, assume that the object SUB to be detected is a medium that has turned purple by culturing microorganisms. In this case, as shown in the "First Lighting Pattern" of FIG. 6, part of the light R1 irradiated from the first light source 22R toward the object SUB is reflected by the object SUB and scattered as light R2. Also, part of the light R1 travels as light R3 to the opposite side of the first light source 22R across the object SUB and reaches the sensor panel 10. Also, in this case, as shown in the "Third Lighting Pattern", part of the light B1 irradiated from the third light source 22B toward the object SUB is reflected by the object SUB and scattered as light B2. Also, part of the light B1 travels as light B3 to the opposite side of the third light source 22B across the object SUB and reaches the sensor panel 10. On the other hand, in this case, as shown in the "Second Lighting Pattern", most of the light G1 irradiated from the second light source 22G toward the object SUB is absorbed by the object SUB because the object SUB is purple and substantially does not reach the sensor panel 10. Thus, among the lights from each of the first light source 22R, the second light source 22G, and the third light source 22B, the light that reaches the sensor panel 10 depends on the color of the object SUB.

[0041] In the embodiment, the PD82 of the optical sensor WA detects the intensity of light and does not distinguish the color of light. Therefore, in the embodiment, for example, a period of turning on the first light source 22R as in the "First Lighting Pattern" shown in FIG. 6, a period of turning on the second light source 22G as in the "Second Lighting Pattern", and a period of turning on the third light source 22B as in the "Third Lighting Pattern" are provided individually to obtain a detection result of light corresponding to the color of the object SUB. That is, in the embodiment, sensor scanning is performed in each of the "First Lighting Pattern", the "Second Lighting Pattern", and the "Third Lighting Pattern". Then, by integrating the results of these sensor scans, an output of the sensor scan including color information corresponding to the color of the object SUB is obtained. Hereinafter, when data integration is described, it refers to the integration of the results of sensor scans for obtaining such an output of the sensor scan including color information corresponding to the color of the object SUB. In data integration, the correction coefficient of the signal intensity described later is reflected.

[0042] Note that, in the example shown in FIG. 6, the fact that light reaching the sensor panel 10 is generated in the "first lighting pattern" and the "third lighting pattern", and no light reaching the sensor panel 10 is generated in the "second lighting pattern" is merely an example, and does not necessarily mean that this is always the case for the "first lighting pattern", "second lighting pattern", and "third lighting pattern".

[0043] Here, assuming that the first output is the output of the photosensor WA corresponding to the period during which light of the first color (e.g., red (R)) is emitted, the "first lighting pattern" shown in FIG. 6 indicates the lighting pattern of the light source unit 22 from which the first output can be obtained. Also, assuming that the second output is the output of the photosensor WA corresponding to the period during which light of the second color (e.g., green (G)) is emitted, the "second lighting pattern" shown in FIG. 6 indicates the lighting pattern of the light source unit 22 from which the second output can be obtained. Further, assuming that the third output is the output of the photosensor WA corresponding to the period during which light of the third color (e.g., blue (B)) is emitted, the "third lighting pattern" shown in FIG. 6 indicates the lighting pattern of the light source unit 22 from which the third output can be obtained.

[0044] Incidentally, as described with reference to FIG. 1, a plurality of light source units 22 are arranged in the light emitting region LA. Also, as described with reference to FIG. 5, the light source unit 22 includes a first light source 22R, a second light source 22G, and a third light source 22B. Therefore, in the embodiment, a plurality of first light sources 22R, second light sources 22G, and third light sources 22B are provided.

[0045] Here, the luminances of the first light source 22R, the second light source 22G, and the third light source 22B of each light source unit 22 can be different from each other. For example, generally, when light sources provided equivalently except for the difference in the color of the emitted light are lit under the same power supply conditions, the light from the green (G) light source tends to be brighter than the light from the red (R) light source and the light from the blue (B) light source. Also, the light reception sensitivity by the photosensor WA may reflect such a tendency.

[0046] FIG. 7 is a schematic graph showing a case where the correspondence between the type of light-emitting light source and the light reception sensitivity by the photosensor WA is relatively compared in terms of the level of the light reception sensitivity. PD82 of the photosensor WA indicates the light reception sensitivity corresponding to the wavelength of the irradiated light. Hereinafter, the light reception sensitivity of PD82 with respect to the wavelength of the light from the first light source 22R is defined as the first sensitivity SenR. Also, the light reception sensitivity of PD82 with respect to the wavelength of the light from the second light source 22G is defined as the second sensitivity SenG. Further, the light reception sensitivity of PD82 with respect to the wavelength of the light from the third light source 22B is defined as the third sensitivity SenB. As shown in FIG. 7, the second sensitivity SenG is higher than the first sensitivity SenR and the third sensitivity SenB. Also, the first sensitivity SenR is higher than the third sensitivity SenB. Thus, the light reception sensitivity of PD82 with respect to the light emitted from each of the first light source 22R, the second light source 22G, and the third light source 22B is different.

[0047] FIG. 8 is a diagram schematically showing the relationship between the exposure time and the detection intensity of light indicated by the signal output by PD82. Hereinafter, when referring to the first detection intensity, it refers to the detection intensity of light indicated by the signal output by PD82 in response to PD82 detecting the light from the first light source 22R. Also, when referring to the second detection intensity, it refers to the detection intensity of light indicated by the signal output by PD82 in response to PD82 detecting the light from the second light source 22G. Further, when referring to the third detection intensity, it refers to the detection intensity of light indicated by the signal output by PD82 in response to PD82 detecting the light from the third light source 22B. Also, when simply referring to the detection intensity, it refers to the detection intensity of light indicated by the signal output by PD82. In FIG. 8 and FIG. 9 described later, the level of the detection intensity is indicated by the level of Rawdata. In the following description, the time during which PD82 can detect the light from the first light source 22R is defined as the first exposure time. Also, the time during which PD82 can detect the light from the second light source 22G is defined as the second exposure time. Further, the time during which PD82 can detect the light from the third light source 22B is defined as the third exposure time. In the comparative example shown in FIG. 8, the first exposure time, the second exposure time, and the third exposure time are unified by the common exposure time TC. On the other hand, in the embodiment shown in FIG. 8, the first exposure time TR, the second exposure time TG, and the third exposure time TB are individually set.

[0048] As shown in the "Exposure Time Setting" column of the "Comparative Example" in FIG. 8, when the first exposure time, the second exposure time, and the third exposure time are unified by the common exposure time TC, a difference in detection intensity occurs according to the difference between the first sensitivity SenR, the second sensitivity SenG, and the third sensitivity SenB. Specifically, as shown in the "Detection Intensity" column of the "Comparative Example" in FIG. 8, the second detection intensity GRG1 is higher than the first detection intensity GRR1 and the third detection intensity GRB1. Also, the first detection intensity GRR1 is higher than the third detection intensity GRB1.

[0049] On the other hand, in the embodiment, a mechanism is provided to make the detection intensity substantially constant regardless of which light source emits light. Specifically, as shown in the "Exposure Time Setting" of the "Embodiment" in FIG. 8, the first exposure time TR, the second exposure time TG, and the third exposure time TB are different from each other. The second exposure time TG is a shorter time compared to the first exposure time TR and the third exposure time TB. The first exposure time TR is a shorter time compared to the third exposure time TB.

[0050] In this way, in the embodiment, for light with a higher light reception sensitivity, the exposure time as the time during which PD82 can detect light is set shorter. As a result, as shown in the "Detection Intensity" column of the "Embodiment", the first detection intensity GRR, the second detection intensity GRG, and the third detection intensity GRB fall within the range Uni. That is, in the embodiment, the detection intensity becomes substantially constant regardless of which light source emits light. In other words, in the embodiment, the first exposure time TR, the second exposure time TG, and the third exposure time TB are determined so that the detection intensity becomes substantially constant regardless of which light source emits light. In the example shown in FIG. 8, the first detection intensity GRR overlaps with the target value Th described later, but this is not a requirement and is merely an example.

[0051] Next, a mechanism for determining each of the first exposure time TR, the second exposure time TG, and the third exposure time TB will be described with reference to FIG. 9.

[0052] FIG. 9 is a schematic diagram showing a mechanism for determining a first exposure time TR, a second exposure time TG, and a third exposure time TB, which are exposure times at which the detection intensity becomes a target value Th. When determining each of the first exposure time TR, the second exposure time TG, and the third exposure time TB, based on the mechanism described with reference to FIGS. 4 to 6, light is irradiated from the light source panel 20 to the sensor panel 10, the light is detected by the PD82 of the sensor panel 10, and a state is prepared in which a detection signal is output from the photosensor WA including the PD82. However, unlike FIGS. 4 and 6, the object to be detected SUB is not located between the sensor panel 10 and the light source panel 20. That is, when determining each of the first exposure time TR, the second exposure time TG, and the third exposure time TB, a state is prepared in which the light from the light source panel 20 can reach the sensor panel 10 without being affected by the object to be detected SUB. Therefore, while the process of determining the exposure time for each light source, such as the first exposure time TR, the second exposure time TG, and the third exposure time TB, is being carried out, the light from the light source panel 20 is directly irradiated onto the sensor panel 10. The implementation steps of the processes described with reference to FIGS. 11 and 12 and the processes described with reference to FIGS. 16 and 17, which will be described later, correspond to the process of determining the exposure time for each such light source.

[0053] With the above-described preparation completed, the first exposure time TR, the second exposure time TG, and the third exposure time TB are individually determined. First, the determination of the first exposure time TR will be described with reference to the "R" column in FIG. 9.

[0054] When determining the first exposure time TR, with the output of PD82 reset, the first light source 22R is turned on. As the first process, the output from the optical sensor WA is obtained when the first time PT1 has elapsed since the start of lighting of the first light source 22R. In the "R" column of FIG. 9, the detection intensity indicated by the first output is the first intensity RawAR. After the output of PD82 is obtained by the first process, the first light source 22R is turned off and the output of PD82 is reset. After the output of PD82 is reset, the first light source 22R is turned on again. As the second process, the output from the optical sensor WA is obtained when the second time PT2 has elapsed since the start of lighting of the first light source 22R. The second time PT2 is a time longer than the first time PT1. In the "R" column of FIG. 9, the detection intensity indicated by the second output is the second intensity RawBR.

[0055] Based on the first time PT1, the second time PT2, the first intensity RawAR, and the second intensity RawBR, the first exposure time TR can be determined. Specifically, as shown in the "R" column of FIG. 9, based on the relationship between the time length of the first time PT1 and the time length of the second time PT2, and the relationship between the first intensity RawAR and the second intensity RawBR, the degree of increase in the detection intensity according to the exposure time can be calculated. In the "R" column of FIG. 9, a graph with the exposure time on the horizontal axis and the detection intensity on the vertical axis shows the degree of increase in the detection intensity according to the exposure time as graph GRR2. The time indicated by the coordinate in the horizontal axis direction corresponding to the intersection of such graph GRR2 and the target value Th on the vertical axis is the first exposure time TR.

[0056] The second exposure time TG and the third exposure time TB can also be determined by the same mechanism as the first exposure time TR.

[0057] When determining the second exposure time TG, with the output of PD82 reset, the second light source 22G is turned on. As the first process, the output from the optical sensor WA is obtained when the first time PT1 has elapsed since the start of lighting of the second light source 22G. In the "G" column of FIG. 9, the detection intensity indicated by the first output is the first intensity RawAG. After the output of PD82 is obtained by the first process, the second light source 22G is turned off and the output of PD82 is reset. After the output of PD82 is reset, the second light source 22G is turned on again. As the second process, the output from the optical sensor WA is obtained when the second time PT2 has elapsed since the start of lighting of the second light source 22G. In the "G" column of FIG. 9, the detection intensity indicated by the second output is the second intensity RawBG.

[0058] Based on the first time PT1, the second time PT2, the first intensity RawAG, and the second intensity RawBG, the second exposure time TG can be determined. Specifically, as shown in the "G" column of FIG. 9, based on the relationship between the time length of the first time PT1 and the time length of the second time PT2, and the relationship between the first intensity RawAG and the second intensity RawBG, the degree of increase in the detection intensity corresponding to the exposure time can be calculated. In the "G" column of FIG. 9, it is a graph with the exposure time on the horizontal axis and the detection intensity on the vertical axis, and the degree of increase in the detection intensity corresponding to the exposure time is shown as graph GRG2. The time indicated by the coordinate in the horizontal axis direction corresponding to the intersection of such graph GRG2 and the target value Th on the vertical axis is the second exposure time TG.

[0059] When determining the third exposure time TB, with the output of PD82 reset, the third light source 22B is turned on. As the first process, the output from the optical sensor WA is obtained when the first time PT1 has elapsed since the start of lighting of the third light source 22B. In the "B" column of FIG. 9, the detection intensity indicated by the first output is the first intensity RawAB. After the output of PD82 is obtained by the first process, the third light source 22B is turned off and the output of PD82 is reset. After the output of PD82 is reset, the third light source 22B is turned on again. As the second process, the output from the optical sensor WA is obtained when the second time PT2 has elapsed since the start of lighting of the third light source 22B. In the "B" column of FIG. 9, the detection intensity indicated by the second output is the second intensity RawBB.

[0060] Based on the first time PT1, the second time PT2, the first intensity RawAB, and the second intensity RawBB, the third exposure time TB can be determined. Specifically, as shown in the "B" column of FIG. 9, based on the relationship between the time length of the first time PT1 and the time length of the second time PT2, and the relationship between the first intensity RawAB and the second intensity RawBB, the degree of increase in the detection intensity corresponding to the exposure time can be calculated. In the "B" column of FIG. 9, a graph with the exposure time on the horizontal axis and the detection intensity on the vertical axis shows the degree of increase in the detection intensity corresponding to the exposure time as graph GRB2. The time indicated by the coordinate in the horizontal axis direction corresponding to the intersection of such graph GRB2 and the target value Th on the vertical axis is the third exposure time TB.

[0061] As shown in FIGS. 8 and 9, the second exposure time TG is shorter than the first exposure time TR and the third exposure time TB. The first exposure time TR is shorter than the third exposure time TB. This is because the second sensitivity SenG is higher than the first sensitivity SenR and the third sensitivity SenB, and the first sensitivity SenR is higher than the third sensitivity SenB. That is, when attempting to equalize the detection intensities corresponding to the outputs of the PD82 irradiated with light from each of a plurality of light sources that emit light of different wavelengths, the exposure time is set shorter for light of a wavelength with a higher light reception sensitivity by the PD82.

[0062] Note that when each of the first exposure time TR, the second exposure time TG, and the third exposure time TB is determined, the object to be detected SUB does not intervene between the sensor panel 10 and the light source panel 20.

[0063] The target value Th is a target value in the process of determining the exposure time for each light source, that is, it is preset as the target value of the output of the optical sensor WA under the condition that no detected object such as the detected object SUB is installed between the sensor panel 10 and the light source panel 20. In the embodiment, the target value Th is 95% of the range (from 0% to 100%) that the output of the optical sensor WA can take, but it is not limited to this and can be changed as appropriate. Note that the target value Th is preferably within the relatively high output portion range in the range of the output generated by the optical sensor WA. In the embodiment, the range of the output generated by the optical sensor WA is such that the state where PD82 is reset and no light is detected at all is 0%, and the state where the output of PD82 is saturated is 100%. The relatively high output portion range refers to, for example, the portion from 90% to 100% in the range of the output generated by such an optical sensor WA.

[0064] By setting the target value Th in this way, the first detection intensity, the second detection intensity, and the third detection intensity will fall within the range Uni described with reference to FIG. 8. That is, the output of the optical sensor WA under the condition that no detected object such as the detected object SUB is installed becomes the output corresponding to the target value Th regardless of the color of the light emitted by the lit light source. Note that in the operation of an actual detection device, due to various error factors, even if the exposure time of each of a plurality of light sources (for example, the first exposure time TR, the second exposure time TG, and the third exposure time TB) is set based on the target value Th, the detection intensity for each light source such as the first detection intensity, the second detection intensity, and the third detection intensity does not always perfectly become the detection intensity corresponding to the target value Th. However, by setting the exposure time of each of a plurality of light sources (for example, the first exposure time TR, the second exposure time TG, and the third exposure time TB) based on the target value Th as described with reference to FIG. 9, the detection intensity for each light source can be made to fall within a range of detection intensities that can be regarded as substantially equivalent, such as the range Uni. The range Uni is, for example, within a high and low error of 5% of the detection intensity based on the target value Th, but the error is not limited to 5% and may be changed as appropriate according to the required accuracy.

[0065] Next, the operation of the detection device 1 in which the first exposure time TR, the second exposure time TG, and the third exposure time TB are respectively reflected will be described with reference to FIG. 10.

[0066] FIG. 10 is a time chart schematically showing the operation of the detection device 1 in which the first exposure time TR, the second exposure time TG, and the third exposure time TB are respectively reflected. In the description with reference to FIG. 10, the period during which any one of the first light source 22R, the second light source 22G, or the third light source 22B is lit, and the reset of PD82 in the optical sensor WA and the output from the optical sensor WA after the reset are performed is defined as the frame period FR. The "R" column in FIG. 10 shows the time chart of the period during which the first light source 22R is lit and the second light source 22G and the third light source 22B are turned off. The "G" column shows the time chart of the period during which the second light source 22G is lit and the first light source 22R and the third light source 22B are turned off. The "B" column shows the time chart of the period during which the third light source 22B is lit and the first light source 22R and the second light source 22G are turned off. The frame period FR includes a sub-frame period SF1 and a sub-frame period SF2. The sub-frame period SF1 is the period during which the reset of PD82 is performed. The sub-frame period SF2 is the period during which the output from the optical sensor WA is performed.

[0067] The reset of PD82 in the sub-frame period SF1 and the output from the optical sensor WA in the sub-frame period SF2 are performed for each sensor row. A sensor row refers to a plurality of optical sensors WA that share one reset signal transmission line 5 and one scanning line 6. For example, in FIG. 2, the plurality of optical sensors WA that share the reset signal transmission line 51 and the scanning line 61 constitute one sensor row. Also, in FIG. 2, the plurality of optical sensors WA that share the reset signal transmission line 52 and the scanning line 62 constitute one sensor row. Thus, in the embodiment, the optical sensors WA constituting the sensor row are arranged in the first direction Dx.

[0068] In FIG. 10, for the purpose of distinguishing the control timings for each sensor row, signal waveforms PL1, PL2, PL3, ···, PLn and signal waveforms QL1, QL2, QL3, ···, QLn are shown. Signal waveforms PL1 and QL1 show the waveforms of signals for a sensor row (the first sensor row) composed of a plurality of optical sensors WA sharing a reset signal transmission line 51 and a scanning line 61. Signal waveforms PL2 and QL2 show the waveforms of signals for a sensor row (the second sensor row) composed of a plurality of optical sensors WA sharing a reset signal transmission line 52 and a scanning line 62. Signal waveforms PL3 and QL3 show the waveforms of signals for a sensor row (the third sensor row) located on the opposite side of the reset signal transmission line 51 with respect to the reset signal transmission line 52 in FIG. 2. Signal waveforms PLn and QLn show the waveforms of signals for a sensor row (the nth sensor row) composed of a plurality of optical sensors WA sharing a reset signal transmission line 5n and a scanning line 6n. Although not shown, between the signal waveform PL3 and the signal waveform PLn, signal outputs for controlling each sensor row are generated according to the number of sensor rows.

[0069] Also, in FIG. 10, the reset signal during the sub-frame period SF1 and the read signal during the sub-frame period SF2 are described separately. The reset signal is applied to the reset signal transmission line 5. The read signal is applied to the scanning line 6. For example, a signal corresponding to the signal waveform PL1 indicating the reset signal is applied to the reset signal transmission line 51. Also, a signal corresponding to the signal waveform QL1 indicating the read signal is applied to the scanning line 61.

[0070] From the time of the start pulse ST1 shown in FIG. 10, a frame period FR accompanied by the lighting of the first light source 22R is started. At the timing Ra1 when the signal waveform PL1 changes from low (OFF) to high (ON) and then back to low (OFF) after the start pulse ST1, each PD82 of the plurality of optical sensors WA constituting the first sensor row is reset. Also, after the first exposure time TR has elapsed from the timing Ra1, the outputs from the plurality of optical sensors WA constituting the first sensor row are transmitted to the detection circuit 15 via the multiplexer 40 at the timing Rb1 when the signal waveform QL1 changes from low (OFF) to high (ON) and then back to low (OFF).

[0071] Also, at the timing Ra2 when the signal waveform PL2 changes from low (OFF) to high (ON) and then back to low (OFF) after the timing Ra1, each PD82 of the plurality of optical sensors WA constituting the second sensor row is reset. Also, after the first exposure time TR has elapsed from the timing Ra2, the outputs from the plurality of optical sensors WA constituting the second sensor row are transmitted to the detection circuit 15 via the multiplexer 40 at the timing Rb2 when the signal waveform QL2 changes from low (OFF) to high (ON) and then back to low (OFF).

[0072] Thereafter, similarly, at the timing Rb3 when the signal waveform QL3 changes from low (OFF) to high (ON) and then back to low (OFF) after the first exposure time TR has elapsed from the timing Ra3 when the signal waveform PL3 changes from low (OFF) to high (ON) and then back to low (OFF) after the timing Ra2. Also, at the timing Rbn when the signal waveform QLn changes from low (OFF) to high (ON) and then back to low (OFF) after the first exposure time TR has elapsed from the timing Ran when the signal waveform PLn changes from low (OFF) to high (ON) and then back to low (OFF). The timing Ran is the last signal among the reset signals that occur during the sub-frame period SF1 of the frame period FR accompanied by the lighting of the first light source 22R. The timing Rbn is the last signal among the readout signals that occur during the sub-frame period SF2 of the frame period FR accompanied by the lighting of the first light source 22R.

[0073] Timings Ra1, Ra2, Ra3, ···, Ran occur during the sub-frame period SF1. Timings Rb1, Rb2, Rb3, ···, Rbn occur during the sub-frame period SF2. The time between timing Ra1 and timing Ran is significantly shorter than the first exposure time TR. Therefore, timing Rb1 does not occur before timing Ran.

[0074] Thus, the optical sensors WA constituting each sensor row are each reset at different timings during the sub-frame period SF1, and a readout signal is given after the exposure time corresponding to the type of light source has elapsed since the reset. The exposure times of each row are unified if the types of light sources are the same. Therefore, the time differences between the reset signals sequentially given like timings Ra1, Ra2, Ra3, ···, Ran and the time differences between the readout signals sequentially given like timings Rb1, Rb2, Rb3, ···, Rbn correspond. The exposure time corresponding to the type of light source is, for example, the first exposure time TR when the first light source 22R is lit. Note that the exposure time when the second light source 22G is lit is the second exposure time TG. Also, the exposure time when the third light source 22B is lit is the third exposure time TB.

[0075] As described above, taking the frame period FR accompanied by the lighting of the first light source 22R as an example, the signal control related to the reset performed in units of sensor rows and the output from the optical sensor WA has been described. However, the basic concept is the same even for a frame period FR accompanied by the lighting of other types of light sources, except that the "exposure time corresponding to the type of light source" changes.

[0076] Specifically, from the time of the start pulse ST2 shown in FIG. 10, a frame period FR accompanied by the lighting of the second light source 22G is started. At a timing Ga1 when the signal waveform PL1 changes from low (OFF) to high (ON) and then back to low (OFF) after the start pulse ST2, each PD82 of the plurality of optical sensors WA constituting the first sensor row is reset. Further, after the second exposure time TG has elapsed from the timing Ga1, at a timing Gb1 when the signal waveform QL1 changes from low (OFF) to high (ON) and then back to low (OFF), the outputs from the plurality of optical sensors WA constituting the first sensor row are transmitted to the detection circuit 15 via the multiplexer 40. Also, at a timing Ga2 after the timing Ga1, the signal waveform PL2 changes from low (OFF) to high (ON), and each PD82 of the plurality of optical sensors WA constituting the second sensor row is reset. Further, after the second exposure time TG has elapsed from the timing Ga2, at a timing Gb2 when the signal waveform QL2 changes from low (OFF) to high (ON) and then back to low (OFF), the outputs from the plurality of optical sensors WA constituting the second sensor row are transmitted to the detection circuit 15 via the multiplexer 40. Thereafter, similarly, at a timing Gb3 when the signal waveform QL3 changes from low (OFF) to high (ON) and then back to low (OFF) after the second exposure time TG has elapsed from a timing Ga3 when the signal waveform PL3 changes from low (OFF) to high (ON) and then back to low (OFF) after the timing Ga2. Also, at a timing Gbn when the signal waveform QLn changes from low (OFF) to high (ON) and then back to low (OFF) after the second exposure time TG has elapsed from a timing Gan when the signal waveform PLn changes from low (OFF) to high (ON) and then back to low (OFF). The timing Gan is the last signal among the reset signals that occur during the sub-frame period SF1 of the frame period FR accompanied by the lighting of the second light source 22G. The timing Gbn is the last signal among the readout signals that occur during the sub-frame period SF2 of the frame period FR accompanied by the lighting of the second light source 22G.

[0077] Timings Ga1, Ga2, Ga3, ···, Gan occur during subframe period SF1. Timings Gb1, Gb2, Gb3, ···, Gbn occur during subframe period SF2. The time between timing Ga1 and timing Gan is significantly shorter than the second exposure time TG. Therefore, timing Gb1 does not occur before timing Gan.

[0078] Also, from the time of the start pulse ST3 shown in FIG. 10, a frame period FR accompanied by the lighting of the third light source 22B is started. At the timing Ba1 when the signal waveform PL1 changes from low (OFF) to high (ON) and then back to low (OFF) after the start pulse ST3, each PD82 of the plurality of optical sensors WA constituting the first sensor row is reset. Also, after the third exposure time TB has elapsed from the timing Ba1, at the timing Rb1 when the signal waveform QL1 changes from low (OFF) to high (ON) and then back to low (OFF), the outputs from the plurality of optical sensors WA constituting the first sensor row are transmitted to the detection circuit 15 via the multiplexer 40. Also, at the timing Ba2 when the signal waveform PL2 changes from low (OFF) to high (ON) and then back to low (OFF) after the timing Ba1, each PD82 of the plurality of optical sensors WA constituting the second sensor row is reset. Also, after the third exposure time TB has elapsed from the timing Ba2, at the timing Rb1 when the signal waveform QL2 changes from low (OFF) to high (ON) and then back to low (OFF), the outputs from the plurality of optical sensors WA constituting the second sensor row are transmitted to the detection circuit 15 via the multiplexer 40. Thereafter, similarly, at the timing Bb3 when the signal waveform QL3 changes from low (OFF) to high (ON) and then back to low (OFF) after the third exposure time TB has elapsed from the timing Ba3 when the signal waveform PL3 changes from low (OFF) to high (ON) and then back to low (OFF) after the timing Ba2. Also, at the timing Bbn when the signal waveform QLn changes from low (OFF) to high (ON) and then back to low (OFF) after the third exposure time TB has elapsed from the timing Ban when the signal waveform PLn changes from low (OFF) to high (ON) and then back to low (OFF). The timing Ban is the last signal among the reset signals generated during the sub-frame period SF1 of the frame period FR accompanied by the lighting of the third light source 22B. The timing Bbn is the last signal among the readout signals generated during the sub-frame period SF2 of the frame period FR accompanied by the lighting of the third light source 22B.

[0079] Timings Ba1, Ba2, Ba3, ···, Ban occur during the sub-frame period SF1. Timings Bb1, Bb2, Bb3, ···, Bbn occur during the sub-frame period SF2. The time between timing Ba1 and timing Ban is significantly shorter than the third exposure time TB. Therefore, timing Bb1 does not occur before timing Ban.

[0080] As described above with reference to FIG. 10, the signal control during the frame period FR is substantially equivalent regardless of the type of light source, except that the "exposure time corresponding to the type of light source" (the first exposure time TR, the second exposure time TG, or the third exposure time TB) corresponds to the type of light source that lights up during the frame period FR.

[0081] Note that the start pulses ST1, ST2, and ST3 shown in FIG. 10 are not at the same timing. In fact, start pulse ST2 is at the timing after the sub-frame period SF2 of the frame period FR starting from start pulse ST1. Also, start pulse ST3 is at the timing after the sub-frame period SF2 of the frame period FR starting from start pulse ST2. That is, in FIG. 10, the "R" column, "G" column, and "B" column are merely listed vertically for the purpose of clarifying the differences between the first exposure time TR, the second exposure time TG, and the third exposure time TB.

[0082] In the embodiment, the operations described with reference to FIG. 10 are realized by the detection circuit 15 controlling the reset circuit 13 and the scanning circuit 14. Specifically, the detection circuit 15 controls the reset circuit 13 and the scanning circuit 14 so that the time length between the output timing of the reset signal from the reset circuit 13 and the output timing of the read signal from the scanning circuit 14 becomes the "exposure time corresponding to the type of light source" (the first exposure time TR, the second exposure time TG, or the third exposure time TB). More specifically, the reset circuit 13 and the scanning circuit 14 are configured such that a shift of the output target occurs by a so-called shift register.

[0083] The detection circuit 15 applies control to make the time interval between the timing (first timing) corresponding to the supply timing of the reset signal to the reset signal transmission line 5 to which the reset signal is first applied and the timing (second timing) corresponding to the supply timing of the read signal to the scanning line 6 to which the read signal is first applied correspond to the exposure time of each light source. For example, in the frame period FR accompanied by the lighting of the first light source 22R, the detection circuit 15 sets the time between the first timing and the second timing to the first exposure time TR. Also, in the frame period FR accompanied by the lighting of the second light source 22G, the detection circuit 15 sets the time between the first timing and the second timing to the second exposure time TG. Further, in the frame period FR accompanied by the lighting of the third light source 22B, the detection circuit 15 sets the time between the first timing and the second timing to the third exposure time TB. To give a more specific example, the frame period FR is periodic, the first timing after the start of the frame period FR is constant, and by changing the second timing according to the type of the lit light source, a mechanism is realized to obtain the output of the photosensor WA corresponding to the exposure time according to the type of the light source. In the embodiment, by the control exemplified in this way, different controls are realized for each of the light sources that emit light of different colors in the time when the photosensor detects light. Also, the "timing corresponding to the supply timing" refers to, for example, in a signal waveform such as a rectangular wave, the timing when it changes from low (OFF) to high (ON) and then becomes low (OFF) again.

[0084] Data indicating the "exposure time corresponding to the type of light source" such as the first exposure time TR, the second exposure time TG, and the third exposure time TB is generated in advance based on the description with reference to FIG. 8 and held by the detection device 1.

[0085] Specifically, in the embodiment, a memory (register) capable of writing parameters indicating the lengths of the first exposure time TR, the second exposure time TG, and the third exposure time TB is provided in the detection circuit 15. The parameters indicating the lengths of the first exposure time TR, the second exposure time TG, and the third exposure time TB are calculated by information processing by the control circuit 30 based on the mechanism described with reference to FIG. 8. By writing the value calculated as such a parameter (for example, the value corresponding to Extime described later) by the control circuit 30 into the memory of the detection circuit 15, the parameters indicating the lengths of the first exposure time TR, the second exposure time TG, and the third exposure time TB are reflected in the operation of the detection device 1. Note that the calculated value may already be reflected in the memory of the detection circuit 15 at the time of shipment of the detection device 1. That is, the exposure time of each of a plurality of types of light sources that emit light of different colors may be set in advance. Also, in that case, the value of the memory may be non-rewritable or may be rewritable. In the embodiment, the value of the memory is rewritable. In the embodiment, a mechanism is adopted in which the exposure time of each of a plurality of types of light sources that emit light of different colors is determined after the power of the detection device 1 is turned on, that is, after the start of energization due to power-on. Specifically, the processes described with reference to FIGS. 11 and 12 (or the processes described with reference to FIGS. 16 and 17) described later are executed as the initial operation after the power of the detection device 1 is turned on.

[0086] FIG. 11 is a flowchart showing the flow of the process related to the determination of the exposure time of each light source. First, a counter for managing values corresponding to the types of light sources is set to an initial value of 1 (step S1). In the example shown in FIG. 11, j is set to an initial value of 1 as a variable for the counter.

[0087] After the process of step S1, the (j)th light source is set as the lighting target (step S2). The (j)th light source refers to, for example, the first light source 22R when j = 1, the second light source 22G when j = 2, and the third light source 22B when j = 3. After the process of step S2, an exposure time determination process is performed (step S3).

[0088] Figure 12 is a flowchart showing the flow of the exposure time determination process. First, the light source targeted for lighting in the process of step S2 lights up (step S11). After the process of step S11, the optical sensor WA is reset (step S12). That is, PD82 is reset by the reset signal.

[0089] After the process of step S12, a process of obtaining the detection intensity at the time point when the first time PT1 has elapsed since the latest reset as the start time as the detection intensity RawA is performed (step S13). The latest reset referred to as the start time at the time of step S13 refers to the reset by the process of step S12 performed immediately before.

[0090] After the process of step S13, the optical sensor WA is reset (step S14). That is, PD82 is reset by the reset signal. After the process of step S14, a process of obtaining the detection intensity at the time point when the second time PT2 has elapsed since the latest reset as the start time as the detection intensity RawB is performed (step S15). The latest reset referred to as the start time at the time of step S15 refers to the reset by the process of step S14 performed immediately before.

[0091] For example, when j = 1, by lighting the first light source 22R, the detection intensity RawA obtained in the process of step S13 is treated as the first intensity RawAR (see FIG. 9), and the detection intensity RawB obtained in the process of step S15 is treated as the second intensity RawBR (see FIG. 9). By the same concept, when j = 2, by lighting the second light source 22G, the detection intensity RawA obtained in the process of step S13 is treated as the first intensity RawAG (see FIG. 9), and the detection intensity RawB obtained in the process of step S15 is treated as the second intensity RawBG (see FIG. 9). Also, when j = 3, by lighting the third light source 22B, the detection intensity RawA obtained in the process of step S13 is treated as the first intensity RawAB (see FIG. 9), and the detection intensity RawB obtained in the process of step S15 is treated as the second intensity RawBB (see FIG. 9).

[0092] Note that the processes of step S12 and step S13, and the processes of step S14 and step S15 are performed in units of sensor rows, similar to the description with reference to FIG. 10. In the embodiment, the obtained data is integrated over all of the plurality of optical sensors WA provided in the detection region SA for each type of light source, that is, for each color of light emitted by the light source. That is, the output of the optical sensor WA in the process related to the determination of the exposure time of each light source performed under the condition where the object to be detected is not installed is the average of the outputs of the plurality of optical sensors WA provided in the detection region SA.

[0093] After the process of step S15, the light source targeted for lighting in the process of step S2 is turned off (step S16). That is, the light source lit in the process of the immediately preceding step S11 is turned off in the process of step S16.

[0094] Also, Extime is calculated as in the following formula (1) (step S17). Th in formula (1) is the target value Th. RawA in formula (1) is the detection intensity RawA obtained in the process of the latest step S13. RawB in formula (1) is the detection intensity RawB obtained in the process of the latest step S15. PT1 in formula (1) is the first time PT1 (see FIG. 9). PT2 in formula (1) is the second time PT2 (see FIG. 9). Note that the processes of step S16 and step S17 may be performed in any order. Extime={(Th-RawB)(PT1-PT2) / (RawA-RawB)}+PT2···(1)

[0095] With reference to FIG. 12, after the exposure time determination process described, that is, after the process of step S3 in FIG. 11, the latest Extime is determined as the exposure time of the (j)th light source (step S4). For example, when j = 1, Extime is determined as the first exposure time TR. When j = 2, Extime is determined as the second exposure time TG. When j = 3, Extime is determined as the third exposure time TB.

[0096] After the process of step S4, it is determined whether the value of j is a value corresponding to the number of colors of light from the light source unit 22 (step S5). Here, the number of colors of light means the same as the number of types of light sources. For example, in an embodiment where the light source panel 20 has a first light source 22R, a second light source 22G, and a third light source 22B, the number of colors of light is 3. Therefore, the case where it is determined that "the value of j is a value corresponding to the number of colors of light from the light source unit 22" is the case where j = 3.

[0097] If it is determined in the process of step S5 that the value of j is not a value corresponding to the number of colors of light from the light source unit 22 (step S5; No), 1 is added to j (step S6). After the process of step S6, the process proceeds to the process of step S2.

[0098] Therefore, the first exposure time TR is set in the processes from step S2 to step S4 performed in the state where j = 1. Also, the second exposure time TG is set in the processes from step S2 to step S4 performed in the state where j = 2. Also, the third exposure time TB is set in the processes from step S2 to step S4 performed in the state where j = 3.

[0099] If it is determined in the process of step S5 that the value of j is a value corresponding to the number of colors of light from the light source unit 22 (step S5; Yes), the process described with reference to FIGS. 11 and 12 ends. By reflecting the exposure time corresponding to Extime (for example, the first exposure time TR, the second exposure time TG, the third exposure time TB) determined in this way in the detection circuit 15, an appropriate exposure time is applied in the sensor scan.

[0100] FIG. 13 is a flowchart showing the flow of sensor scan. First, a counter for managing a value corresponding to the type of light source is set to an initial value of 1 (step S21). In the example shown in FIG. 11, k is set to an initial value of 1 as a variable for the counter.

[0101] After the process of step S21, the (k)th light source is turned on (step S22). What the description of the (k)th light source indicates is the same as the description of the above-mentioned (j)th light source. After the process of step S22, the optical sensor WA is reset (step S23). That is, PD82 is reset by a reset signal.

[0102] After the process of step S23, a process is performed to acquire, as data on the color of the light of the (k)th light source, the detection intensity at the time when the exposure time of the (k)th light source from the latest reset as the start time has elapsed (step S24). The latest reset referred to as the start time at the time of step S24 refers to the reset by the process of step S23 performed immediately before.

[0103] Note that the flow of the process of step S23 and the process of step S24 is performed in units of sensor rows, similar to the description with reference to FIG. 10. In the embodiment, the obtained data is integrated over all of the plurality of optical sensors WA provided in the detection region SA.

[0104] After the process of step S24, the light source turned on in the process of step S22 is turned off (step S25). After the process of step S25, it is determined whether the value of k is a value corresponding to the number of colors of light from the light source unit 22 (step S26). The concept of the number of colors of light here is the same as that in the process of step S5 described above.

[0105] If it is determined in the process of step S26 that the value of k is not a value corresponding to the number of colors of light from the light source unit 22 (step S26; No), 1 is added to k (step S27). After the process of step S27, the process proceeds to step S22.

[0106] Therefore, data (R data) of the color of the light of the first light source 22R is obtained from the process of step S22 to the process of step S24 performed in the state where k = 1. Also, data (G data) of the color of the light of the second light source 22G is obtained from the process of step S22 to the process of step S24 performed in the state where k = 2. Further, data (B data) of the color of the light of the third light source 22B is obtained from the process of step S22 to the process of step S24 performed in the state where k = 3.

[0107] When it is determined in the process of step S26 that the value of k is a value corresponding to the number of colors of the light from the light source unit 22 (step S26; Yes), the generation process of the image data by the synthesis of the data of all the colors is performed (step S28). In the embodiment, generation of RGB data by the synthesis of the above-described R data, G data, and B data is performed. When the process of step S28 is completed, the process described with reference to FIG. 13 ends.

[0108] The processes of FIGS. 11 and 12 are realized, for example, by the control circuit 30 controlling the operations of the sensor panel 10 and the light source panel 20. Also, the control for the process of step S24 in FIG. 13 is performed by the detection circuit 15 based on, for example, the exposure times (for example, the first exposure time TR, the second exposure time TG, and the third exposure time TB) already reflected in the detection circuit 15. The control other than the control for the process of step S24 in FIG. 13 is realized, for example, by the control circuit 30 controlling the operations of the sensor panel 10 and the light source panel 20.

[0109] As described above, according to the embodiment, the detection device 1 includes a sensor panel (for example, sensor panel 10) having a detection area (for example, detection area SA) in which a plurality of optical sensors (for example, optical sensor WA) are two-dimensionally arranged, a light source unit (for example, light source unit 22) provided with a plurality of types of light sources (for example, first light source 22R, second light source 22G, third light source 22B) that emit light of different colors, a member (for example, radiation limiting member 50 or installation member 60) provided so that a detection object (for example, detection object SUB) can be installed so as to be interposed between the detection area and the light source unit, and a detection circuit (for example, detection circuit 15) that obtains outputs of the plurality of optical sensors. The optical sensor includes a photodiode (for example, PD82), and an output corresponding to the photocurrent generated in response to the light detected by the photodiode is obtained. The light sources that emit light of different colors do not light up simultaneously but light up in different periods. The exposure time during which the optical sensor detects light is different for each of the light sources that emit light of different colors (for example, first exposure time TR, second exposure time TG, third exposure time TB). The output of the optical sensor under the condition that the detection object is not installed is within an output range (for example, range Uni) corresponding to a predetermined target value (for example, target value Th) regardless of the color of the light emitted by the lit light source. In this way, by making the time during which the optical sensor detects light different for each of the light sources that emit light of different colors, color calibration that brings the output within the output range corresponding to the target value is realized. Therefore, a more accurate color reproduction by such color calibration is reflected in the output of the optical sensor when the detection object is installed. Therefore, according to the embodiment, the color detection accuracy can be further improved.

[0110] Further, by being within 5% of the output error based on the output of the optical sensor (for example, optical sensor WA) corresponding to the output range (for example, range Uni) and the target value (for example, target value Th), the color detection accuracy can be more reliably improved.

[0111] Further, by setting the target value (e.g., target value Th) within the range of 90% to 100% of the output range generated by the optical sensor (e.g., optical sensor WA), a brighter sensor scan result can be obtained.

[0112] Also, by making the output of the optical sensor (e.g., optical sensor WA) under the condition that the object to be detected (e.g., object to be detected SUB) is not installed be the average of the outputs of a plurality of such optical sensors provided in the detection region (e.g., detection region SA), the overall color detection accuracy of the plurality of such optical sensors can be further enhanced.

[0113] Moreover, by including a plurality of types of light sources including a first light source (e.g., first light source 22R) that emits light of a first color, a second light source (e.g., second light source 22G) that emits light of a second color, and a third light source (e.g., third light source 22B) that emits light of a third color, the color detection accuracy in a configuration where a color scan result based on a combination of the first color, the second color, and the third color can be obtained is further enhanced.

[0114] Also, by presetting the exposure time of each of the plurality of types of light sources that emit light of different colors (e.g., first exposure time TR, second exposure time TG, third exposure time TB), the relevant exposure time can be more reliably applied, and the color detection accuracy can be more reliably enhanced.

[0115] Furthermore, by providing a control circuit (e.g., control circuit 30) that determines the exposure time of each of the plurality of types of light sources that emit light of different colors after the start of energization due to power-on, more accurate color reproduction by color calibration based on the latest state of the detection device 1 is reflected, and the color detection accuracy is further enhanced.

[0116] (Modification example) Next, a modification example that is partially different from the embodiment described with reference to FIGS. 1 to 10 will be described with reference to FIGS. 14 to 18. Regarding the description of the modification example, the same reference numerals may be given to the same matters as those in the embodiment, and the description may be omitted.

[0117] FIG. 14 is a schematic diagram showing an example regarding the number of blocks in the detection area SA and the number of inputs of the multiplexer. In the first modification, the detection area SA is divided into a plurality of divided areas (blocks). In the example shown in FIG. 14, the detection area SA is divided into a total of four blocks, namely Block1, Block2, Block3, and Block4. As shown in the order of Block1, Block2, Block3, and Block4, the plurality of blocks that divide the detection area SA in the first modification are arranged in the second direction Dy. In the first modification, the plurality of optical sensors WA provided in the detection area SA are equally or almost equally divided by the number of blocks. The number of optical sensors WA included in such a plurality of blocks is the same or almost the same.

[0118] In the modification, it is desirable that n be a multiple of the number of blocks. When n is a multiple of the number of blocks, the number of reset signal transmission lines 5 and the number of scanning lines 6 included in each of the plurality of blocks is the number obtained by dividing n by the number of blocks. However, it is not essential that each block has exactly the same number of optical sensors WA. Some blocks may have more optical sensors WA than other blocks. Note that the number of blocks is not limited to 4 and may be any natural number of 2 or more.

[0119] In addition, in the modification example, classification according to the number of inputs of the multiplexer is further applied. The number of inputs of the multiplexer referred to here is the number of a plurality of switches (for example, switches SW1, SW2, SW3, SW4) that the multiplexer 40 described with reference to FIG. 2 has. In FIG. 14, the classification according to the number of inputs of the multiplexer is indicated by the values of "1", "2", "3", and "4" enclosed as the multiplexer input MUX. "1" of the multiplexer input MUX indicates the signal line 7 connected to the switch SW1. "2" of the multiplexer input MUX indicates the signal line 7 connected to the switch SW2. "3" of the multiplexer input MUX indicates the signal line 7 connected to the switch SW3. "4" of the multiplexer input MUX indicates the signal line 7 connected to the switch SW4. Note that in the embodiments and various modification examples including the modification example 1, the number of inputs of the multiplexer is not limited to 4, and may be any natural number of 2 or more.

[0120] FIG. 15 is a diagram showing an example of an individual detection flow by a combination of a block and an input of a multiplexer. In the modification example 1, based on the combination of a block and an input of the multiplexer, the output of the optical sensor WA in the scan process is classified. In FIG. 15, the scan process starts (START) from "Block1MUX1" and sequentially proceeds in the order of "Block1MUX2", "Block1MUX3", "Block1MUX4", "Block2MUX1", "Block2MUX2", "Block2MUX3", "Block2MUX4", "Block3MUX1", "Block3MUX2", "Block3MUX3", "Block3MUX4", "Block4MUX1", "Block4MUX2", "Block4MUX3", "Block4MUX4", and ends (END) with the completion of the scan process of "Block4MUX4" as an example.

[0121] "Block1MUX1" refers to the optical sensor WA included in block Block1, which shares the signal line 7 connected to switch SW1. "Block1MUX2" refers to the optical sensor WA included in block Block1, which shares the signal line 7 connected to switch SW2. "Block2MUX1" refers to the optical sensor WA included in block Block2, which shares the signal line 7 connected to switch SW1. Thus, in the description of "Block(q)MUX(r)", (q) is a natural number and takes a value less than or equal to the number of blocks. Also, (r) is a natural number and takes a value less than or equal to the number of inputs of the multiplexer. That is, "Block(q)MUX(r)" refers to the optical sensor WA included in block Block(q), which shares the signal line 7 connected to switch SW(r). In the example shown in Fig. 14, (q) and (r) take any value from 1, 2, 3, 4.

[0122] In the configuration example described with reference to Fig. 14, "Block1MUX1", "Block1MUX2", "Block1MUX3", "Block1MUX4", "Block2MUX1", "Block2MUX2", "Block2MUX3", "Block2MUX4", "Block3MUX1", "Block3MUX2", "Block3MUX3", "Block3MUX4", "Block4MUX1", "Block4MUX2", "Block4MUX3", "Block4MUX4" each cover different sub-regions of the detection region SA. For example, "Block1MUX1" can be understood as a sub-region of the detection region SA consisting of the sensor rows included in block Block1 and the sensor columns connected to switch SW1. Combining the outputs of all these 16 sub-regions is equivalent to the output of the entire detection region SA.

[0123] In the scan process of "Block(q)MUX(r)", a read signal is applied to the scan line 6 of block Block(q), and no read signal is applied to other read signals. Also, in the scan process of "Block(q)MUX(r)", switch SW(r) is turned ON (conductive state), and switches other than switch SW(r) provided in multiplexer 40 are turned OFF (non-conductive state). In this way, an output limited to the output from the optical sensor WA indicated by "Block(q)MUX(r)" can be obtained.

[0124] In the modification example, the exposure time settings, such as the above-described first exposure time TR, second exposure time TG, and third exposure time TB, are individually performed in block units. Hereinafter, the determination of the exposure time in such block units and the sensor scan after the determination will be described with reference to FIGS. 16 to 18.

[0125] FIG. 16 is a flowchart showing the flow of processing related to the determination of the exposure time of each light source in the modification example. First, a counter for managing values corresponding to the type of light source and the number of divided regions (blocks) is set to an initial value of 1 (step S31). In the example shown in FIG. 16, p is set as a variable for managing the type of light source. Also, q is set as a variable for managing the number of divided regions (blocks).

[0126] After the processing of step S31, the (p)th light source is set as the lighting target (step S32). What is indicated by the description of the (p)th light source is the same as the description of the above-described (j)th light source. Also, Block(q) is set as the target block (step S33). For example, when q = 1, what is indicated by the description of Block(q) is block Block1. The processing of step S32 and the processing of step S33 can be in any order. After the processing of step S32 and the processing of step S33, an exposure time determination process is performed (step S34).

[0127] FIG. 17 is a flowchart showing the flow of exposure time determination processing in a modified example. First, the same processing as that of step S11 and step S12 described with reference to FIG. 12 is performed. After that, a process of obtaining, as detection intensity RawA, the detection intensity at the time point when the first time PT1 has elapsed since the latest reset as the start time point, which is the detection intensity in Block(q), is performed (step S41). The latest reset referred to as the start time point at the time of step S41 refers to the reset by the process of step S12 performed immediately before. The process of step S41 and the process of step S13 described with reference to FIG. 12 differ in that the acquisition target of the detection intensity is limited to Block(q) or the entire detection region SA.

[0128] After the process of step S41, the same process as that of step S14 described with reference to FIG. 12 is performed. After that, a process of obtaining, as detection intensity RawB, the detection intensity at the time point when the second time PT2 has elapsed since the latest reset as the start time point, which is the detection intensity in Block(q), is performed (step S42). The latest reset referred to as the start time point at the time of step S42 refers to the reset by the process of step S14 performed immediately before. The process of step S42 and the process of step S15 described with reference to FIG. 12 differ in that the acquisition target of the detection intensity is limited to Block(q) or the entire detection region SA.

[0129] After the process of step S42, the same processes as those of step S16 and step S17 described with reference to FIG. 12 are performed. Note that Extime calculated in the process of step S17 in the modified example is the Extime of Block(q) in the state where the (p)th light source is lit. For example, when q = 1, the Extime of block Block1 is calculated. When q = 2, the Extime of block Block2 is calculated. When q = 3, the Extime of block Block3 is calculated. When q = 4, the Extime of block Block4 is calculated.

[0130] Note that the processes of step S12 and step S41 and the processes of step S14 and step S42 are performed in units of sensor rows, similar to the description with reference to FIG. 10. In a modified example, the obtained data is integrated in units of Block(q).

[0131] The exposure time determination process described with reference to FIG. 17, that is, after the process of step S34 in FIG. 16, the latest Extime is determined as the exposure time of the (p)th light source in Block(q) (step S35). For example, when p = 1 and q = 1, Extime is determined as the first exposure time TR in Block 1.

[0132] After the process of step S35, it is determined whether the value of q is a value corresponding to the number of blocks (step S36). For example, in the case of the example described with reference to FIG. 14, the number of blocks is 4. Therefore, the case where it is determined that "the value of q is a value corresponding to the number of blocks" is the case where q = 4.

[0133] If it is determined in the process of step S36 that the value of q is not a value corresponding to the number of blocks (step S36; No), 1 is added to q (step S37). After the process of step S37, the process proceeds to step S33.

[0134] Therefore, the exposure time of the (p)th light source in Block 1 is set from the process of step S33 to the process of step S35 performed in the state where q = 1. Also, the exposure time of the (p)th light source in Block 2 is set from the process of step S33 to the process of step S35 performed in the state where q = 2. Also, the exposure time of the (p)th light source in Block 3 is set from the process of step S33 to the process of step S35 performed in the state where q = 3. Also, the exposure time of the (p)th light source in Block 4 is set from the process of step S33 to the process of step S35 performed in the state where q = 4.

[0135] If it is determined in the process of step S36 that the value of q corresponds to the number of blocks (step S36; Yes), it is determined whether the value of p corresponds to the number of colors of light from the light source unit 22 (step S38). The concept of the number of colors of light here is the same as that in the process of step S5 described above. If it is determined in the process of step S38 that the value of p does not correspond to the number of colors of light from the light source unit 22 (step S38; No), 1 is added to p, and the value of q is initialized and set to 1 (step S39). After the process of step S39, the process proceeds to the process of step S32.

[0136] Therefore, the first exposure time TR of each block is set in the processes from step S32 to step S35 performed in the state where p = 1. Also, the second exposure time TG of each block is set in the processes from step S32 to step S35 performed in the state where p = 2. Also, the third exposure time TB of each block is set in the processes from step S32 to step S35 performed in the state where p = 3.

[0137] If it is determined in the process of step S38 that the value of p corresponds to the number of colors of light from the light source unit 22 (step S38; Yes), the process described with reference to FIGS. 16 and 17 ends. By reflecting the exposure time corresponding to Extime (for example, the first exposure time TR, the second exposure time TG, the third exposure time TB) determined in this way in the detection circuit 15, an appropriate exposure time is applied in the sensor scan.

[0138] FIG. 18 is a flowchart showing the flow of sensor scan in a modified example. First, a counter for managing values corresponding to the type of light source and the number of divided regions (blocks) is set to an initial value of 1 (step S51). In the example shown in FIG. 18, v is set as a variable for managing the type of light source. Also, w is set as a variable for managing the number of divided regions (blocks).

[0139] After the process of step S51, the (v)th light source is turned on (step S52). What the description of the (v)th light source indicates is the same as the description of the (j)th light source described above. After the process of step S52, the optical sensor WA is reset (step S53). That is, similar to the process of step S23, the PD82 is reset by a reset signal.

[0140] After the process of step S53, when the exposure time of the (k)th light source in Block (w) has elapsed since the latest reset as the start point, a process of acquiring the detection intensity at that time as the data of the color of the light of the (k)th light source in Block (w) is performed (step S54). The latest reset referred to as the start point at the time of step S54 refers to the reset by the process of step S53 performed immediately before. Note that what the description of Block (w) indicates is the same as the description of Block (q) described above.

[0141] Note that the flow of the process of step S53 and the process of step S54 is performed in units of sensor rows, similar to the description with reference to FIG. 10.

[0142] After the process of step S54, it is determined whether the value of w is a value corresponding to the number of blocks (step S55). If it is determined in the process of step S55 that the value of w is not a value corresponding to the number of blocks (step S55; No), 1 is added to w (step S56). After the process of step S56, the process proceeds to step S53.

[0143] Therefore, the color data of the light of the (v)-th light source in Block Block1 is set in the process of step S54 from the process of step S53 performed in the state where w = 1. Also, the color data of the light of the (v)-th light source in Block Block2 is set in the process of step S54 from the process of step S53 performed in the state where w = 2. Also, the color data of the light of the (v)-th light source in Block Block3 is set in the process of step S54 from the process of step S53 performed in the state where w = 3. Also, the color data of the light of the (v)-th light source in Block Block4 is set in the process of step S54 from the process of step S53 performed in the state where w = 4.

[0144] If it is determined in the process of step S55 that the value of w is a value corresponding to the number of blocks (step S55; Yes), the light source that was lit in the process of step S32 is turned off (step 57). After the process of step S57, it is determined whether the value of v is a value corresponding to the number of colors of the light from the light source unit 22 (step S58). The concept of the number of colors of light here is the same as that in the process of step S5 described above.

[0145] If it is determined in the process of step S58 that the value of v is not a value corresponding to the number of colors of the light from the light source unit 22 (step S58; No), 1 is added to v, and the value of w is initialized and set to 1 (step S59). After the process of step S59, the process proceeds to the process of step S52.

[0146] Therefore, the color data (R data) of the light of the first light source 22R is obtained in the process of step S54 from the process of step S52 performed in the state where v = 1. Also, the color data (G data) of the light of the second light source 22G is obtained in the process of step S54 from the process of step S52 performed in the state where v = 2. Also, the color data (B data) of the light of the third light source 22B is obtained in the process of step S54 from the process of step S52 performed in the state where v = 3.

[0147] When it is determined in the process of step S58 that the value of v corresponds to the number of colors of light from the light source unit 22 (step S58; Yes), the process of generating image data by synthesizing data of all colors is performed (step S60). In a modified example, the process of step S54 is performed for each combination of the color of light and the block, but in the process of step S60, the data obtained by the process of step S54 performed multiple times are all synthesized. When the process of step S60 is completed, the process described with reference to FIG. 18 ends.

[0148] The processes of FIGS. 16 and 17 are realized, for example, when the control circuit 30 controls the operations of the sensor panel 10 and the light source panel 20. Also, the control for the process of step S54 in FIG. 18 is performed by the detection circuit 15 based on, for example, the exposure times (for example, the first exposure time TR, the second exposure time TG, the third exposure time TB) already reflected in the detection circuit 15. The control other than the control for the process of step S54 in FIG. 18 is realized, for example, when the control circuit 30 controls the operations of the sensor panel 10 and the light source panel 20.

[0149] As described above, according to the modified example, a plurality of optical sensors (for example, the optical sensor WA) are arranged in a matrix, have a plurality of sub-regions (for example, blocks Block1, Block2, Block3, Block4), and the exposure time of each of a plurality of types of light sources that emit lights of different colors is determined for each of the sub-regions, so that a finer color calibration can be realized and the color detection accuracy can be further improved.

[0150] As described above, the modified example has been explained. Matters that are commonly applicable in both the embodiment and the modified example will be described in more detail with reference to FIGS. 19 to 21.

[0151] FIG. 19 is a schematic diagram schematically showing a configuration example of a detection system 100 provided as a configuration including the detection device 1. As shown in FIG. 19, the detection system 100 includes a plurality of detection devices 1, a host IC 70, and a connection circuit 125. The plurality of detection devices 1 are electrically connected to a common host IC 70 via the connection circuit 125.

[0152] As shown in Fig. 19, the incubator 120 is maintained in an environment (temperature, humidity, etc.) suitable for culturing the object to be detected SUB with the door closed. A plurality of detection devices 1 are arranged inside the incubator 120 and perform the above-described sensor scan (see Figs. 13 and 18).

[0153] Fig. 20 is a schematic diagram showing the relationship between one detection device 1 and the external configuration. As shown in Fig. 20, the connection between the detection device 1 and the connection circuit 125 is made by the connection between the control circuit 30 and the connection circuit 125. Also, as shown in Fig. 5, the sensor panel 10 and the light source panel 20 face each other. Further, a gap is provided between the sensor panel 10 and the light source panel 20 where the object to be detected SUB can be placed.

[0154] The object to be detected SUB is made of a translucent member, and a culture medium is formed on the upper surface side. The culture medium is a medium in which colonies can be cultured. Hereinafter, when simply referred to as a colony, it refers to a colony formed by biological tissues or microorganisms cultured in the culture medium formed on the object to be detected SUB. More specifically, the object to be detected SUB is, for example, a glass Petri dish, but is not limited thereto, and other configurations having the same function may be used. Also, the culture medium formed on the object to be detected SUB does not exhibit complete light-shielding properties, but exhibits translucency to such an extent that the degree of light transmission changes according to the presence or absence of colonies and the thickness of the colonies.

[0155] Fig. 21 is a schematic diagram showing the positional relationship between the main configuration of the detection device 1 and the object to be detected SUB. When the object to be detected SUB is placed between the sensor panel 10 and the light source panel 20, as shown in Fig. 21, the object to be detected SUB is placed on the installation member 60. The installation member 60 functions as a member provided so that the object to be detected SUB can be installed so as to interpose the object to be detected SUB between the detection region SA and the light source panel 20. The installation member 60 is configured such that the portion on which the object to be detected SUB is placed is made of a translucent member, and the portion located on the outer peripheral side thereof is made of a light-shielding member. Taking a specific example, the translucent member is made of glass or a colorless resin, and the light-shielding member is made of a black resin.

[0156] Note that in the light source unit 22 shown in FIG. 5, the longitudinal directions of the first light source 22R, the second light source 22G, and the third light source 22B are along the second direction Dy, and the first light source 22R, the second light source 22G, and the third light source 22B are arranged in this order from one side to the other side in the first direction Dx. However, this is an example of the form of the light source unit 22 and is not limited thereto. For example, the shapes of the first light source 22R, the second light source 22G, and the third light source 22B in the light source unit 22 in a plan view and the positional relationship among the first light source 22R, the second light source 22G, and the third light source 22B can be changed as appropriate.

[0157] Further, the configuration of the light source unit 22 is not limited to the first light source 22R, the second light source 22G, and the third light source 22B. For example, one or more other light sources that emit light of a color different from that of the first light source 22R, the second light source 22G, and the third light source 22B may be included in the configuration of the light source unit 22. Further, at least one or more of the other light sources and the first light source 22R, the second light source 22G, and the third light source 22B may be included in the configuration of the light source unit 22.

[0158] Further, the switching element 81 and the switching element 85 shown in FIG. 3 are not limited to a configuration by a single switching element. FIG. 22 is a circuit diagram showing an optical sensor having a partially different configuration from that of FIG. 3. For example, the switching element 81 may have a so-called double gate configuration of the switching element 81a and the switching element 81b as shown in FIG. 22. Further, the switching element 85 may have a so-called double gate configuration of the switching element 85a and the switching element 85b as shown in FIG. 17.

[0159] Further, the object to be detected such as the object to be detected SUB is not limited to a Petri dish on which a culture medium is formed, and may be in other forms. For example, it may be a plate for suspension culture or the like.

[0160] Also, the arrangement of the optical sensors WA is not limited to a matrix along the first direction Dx and the second direction Dy. For example, the optical sensors WA arranged in each of the sensor rows adjacent to each other in the second direction Dy do not necessarily have to be located linearly along the second direction Dy. Specifically, it may be in a so-called staggered pattern. From the perspective of sharing the reset signal transmission line 5 and the scanning line 6, it is desirable that the arrangement along the first direction Dx among the plurality of optical sensors WA is an arrangement located on a straight line along the first direction Dx, but this is not essential either, and it can be appropriately changed within a range that does not impair the functions of the optical sensors WA and the detection region SA. The arrangement of the light source units 22 in the light source panel 20 is not limited to a matrix pattern either, and can be arranged arbitrarily.

[0161] Also, the multiplexer 40 is not essential. That is, the signal line 7 may be connected to the detection circuit 15 without passing through the multiplexer 40. Further, "as a member provided so that a detection object (for example, the detection object SUB) can be installed so as to be interposed between the detection region SA and the light source unit 22, for example, the radiation limiting member 50 or the installation member 60 is illustrated, but it is not limited to any of these, and other forms of members may be used.

[0162] In addition, when any of the members such as the radiation limiting member 50 and the installation member 60 is provided, such a member remains provided even while the process of determining the exposure time for each light source such as the first exposure time TR, the second exposure time TG, and the third exposure time TB is being carried out. The implementation steps of the processes described with reference to FIGS. 11 and 12 and the processes described with reference to FIGS. 16 and 17 correspond to the process of determining the exposure time for each light source.

[0163] Also, other operational effects brought about by the aspects described in the present embodiment that are obvious from the description in this specification or that can be appropriately conceived by those skilled in the art are naturally understood to be brought about by the present disclosure.

Description of Reference Numerals

[0164] 1 Detection device 10 Sensor panel 15 Detection circuit 22 Light source unit 22R First light source 22G Second light source 22B Third light source 30 Control circuit 82 PD SA Detection area WA Optical sensor

Claims

1. A sensor panel having a detection area in which a plurality of optical sensors are two-dimensionally arranged; A light source unit provided with a plurality of types of light sources that emit light of different colors; A member provided so that a detection object can be installed so that the detection object is interposed between the detection area and the light source unit; A detection circuit that obtains outputs of the plurality of optical sensors; and The optical sensor includes a photodiode, and an output corresponding to a photocurrent generated in response to light detected by the photodiode is obtained; Light sources that emit light of different colors do not light up simultaneously but light up in different periods; The exposure time during which the optical sensor detects light is different for each of the light sources that emit light of different colors; The output of the optical sensor under the condition that the detection object is not installed is within an output range corresponding to a predetermined target value regardless of the color of the light emitted by the lit light source; A detection device.

2. The output range is within 5% of the output error based on the output of the optical sensor corresponding to the target value; The detection device according to claim 1.

3. The target value is set within the range of 90% to 100% of the output range generated by the optical sensor; The detection device according to claim 1 or 2.

4. The output of the optical sensor under the condition that the detection object is not installed is the average of the outputs of the plurality of optical sensors provided in the detection area; The detection device according to claim 1 or 2.

5. The plurality of types of light sources include: A first light source that emits light of a first color; A second light source that emits light of a second color; A third light source that emits light of a third color; The detection device according to claim 1 or 2.

6. The exposure time of each of the plurality of types of light sources that emit light of different colors is preset; The detection device according to claim 1 or 2.

7. A control circuit is provided that determines the exposure time of each of the plurality of types of light sources that emit light of different colors after the start of energization by power-on; The detection device according to claim 1 or 2.

8. The detection area: A plurality of the optical sensors are arranged in a matrix; Has a plurality of sub-areas; The exposure time of each of the plurality of types of light sources that emit light of different colors is determined for each of the sub-areas; The detection device according to claim 1 or 2.

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