阅读说明：本技术 接近检测电路及终端设备 (Proximity detection circuit and terminal device ) 是由 陈朝喜 于 2019-11-29 设计创作，主要内容包括：本公开是关于一种接近检测电路及终端设备,属于接近检测技术领域。该接近检测电路与折叠屏配合,折叠屏包括可相对折叠的第一部和第二部。接近检测电路包括：检测模组、至少两个接近传感器、以及控制模组；检测模组用于检测第一部和第二部的相对位置。至少两个接近传感器分别对应第一部和第二部设置,用于检测外部目标是否接近折叠屏。控制模组与检测模组和至少两个接近传感器相连,用于根据相对位置使能对应第一部和/或第二部的接近传感器。(The disclosure relates to a proximity detection circuit and terminal equipment, and belongs to the technical field of proximity detection. The proximity detection circuit cooperates with a foldable screen that includes a first portion and a second portion that are foldable relative to each other. The proximity detection circuit includes: the device comprises a detection module, at least two proximity sensors and a control module; the detection module is used for detecting the relative position of the first part and the second part. At least two proximity sensors are respectively arranged corresponding to the first part and the second part and used for detecting whether an external target is close to the folding screen. The control module is connected with the detection module and the at least two proximity sensors and is used for enabling the proximity sensors corresponding to the first portion and/or the second portion according to the relative positions.)

1. A proximity detection circuit, wherein said circuit cooperates with a foldable screen, said foldable screen comprising a first portion and a second portion that are foldable relative to each other; the circuit comprises:

a detection module for detecting the relative position of the first part and the second part;

at least two proximity sensors respectively corresponding to the first part and the second part and used for detecting whether an external target approaches the folding screen; and

and the control module is connected with the detection module and the at least two proximity sensors and is used for enabling the proximity sensors corresponding to the first part and/or the second part according to the relative positions.

2. The circuit of claim 1, wherein the relative position comprises the first and second portions being disposed upwardly and coplanar;

the control module enables proximity sensors corresponding to the first and second portions in response to the first and second portions being disposed upwardly and coplanar.

3. The circuit of claim 1, wherein the relative position comprises the first portion being located over the second portion;

the control module enables the proximity sensor corresponding to the first portion to disable the proximity sensor corresponding to the second portion in response to the first portion being located over the second portion.

4. The circuit of claim 1, wherein the relative position comprises the second portion being located over the first portion;

the control module enables the proximity sensor corresponding to the second portion to disable the proximity sensor corresponding to the first portion in response to the second portion being located over the first portion.

5. The circuit of claim 1, wherein the proximity sensor comprises:

the emitting component is driven by the control module to emit detection light; and

and the receiving component is used for receiving the detection light reflected by the external target, converting the received detection light into a digital signal and sending the digital signal to the control module.

6. The circuit of claim 5, wherein the transmit component comprises:

the power supply device is connected with the control module and is driven by the control module to output current;

a light emitting member for receiving the current and emitting the detection light; and

and the switch part is connected with the power supply device and the luminous part and is controlled by the control module to be communicated with the power supply device and the luminous part.

7. The circuit of claim 5, wherein the receiving component comprises:

the photoelectric detector is used for receiving the detection light reflected back by the external target and converting the detection light into an initial electric signal; and

and the proximity sensor is connected with the photoelectric detector, converts the initial electric signal into the digital signal and sends the digital signal to the control module.

8. The circuit of claim 7, wherein the proximity sensor comprises:

the signal amplification circuit is connected with the photoelectric detector and converts the initial electric signal into an amplified electric signal;

the sampling hold circuit is connected with the signal amplification circuit and converts the amplified electric signal into an electric signal to be sampled; and

and the analog-to-digital conversion circuit is connected with the sampling holding circuit and is used for converting the electric signal to be sampled into the digital signal.

9. The circuit of claim 1, wherein the detection module comprises: an angle sensor and/or an acceleration sensor.

10. A terminal device, characterized in that the terminal device comprises: a folding screen, and the proximity detection circuit of any one of claims 1-9;

the folding screen comprises a first part and a second part which can be folded oppositely;

at least two proximity sensors in the proximity detection circuit are provided corresponding to the first portion and the second portion, respectively.

11. The terminal device according to claim 10, wherein a light hole is provided on the folding screen, and the proximity sensor is provided corresponding to the light hole; alternatively, the first and second electrodes may be,

a gap is formed in the folding screen, and the proximity sensor is arranged corresponding to the gap; alternatively, the first and second electrodes may be,

the folding screen is provided with a light transmission area, and the proximity sensor is attached to the back of the folding screen corresponding to the light transmission area.

Technical Field

The present disclosure relates to proximity detection technologies, and in particular, to a proximity detection circuit and a terminal device.

Background

With the development of hardware technology, the folding screen becomes a hot trend of the terminal device. The folding screen can be folded along a set axis, so that the terminal equipment with the folding screen has multiple working states.

The approach detection circuit is widely applied to the terminal equipment and used for detecting whether an external target approaches to a display screen of the terminal equipment or not and further controlling the on-off of the display screen according to a detection result. However, the related art does not provide a proximity detection circuit capable of cooperating with the folding screen.

Disclosure of Invention

The present disclosure provides a proximity detection circuit and a terminal device to solve the drawbacks of the related art.

A proximity detection circuit according to a first aspect of the present disclosure, the circuit cooperating with a foldable screen, the foldable screen comprising a first portion and a second portion that are relatively foldable; the circuit comprises:

a detection module for detecting the relative position of the first part and the second part;

at least two proximity sensors respectively corresponding to the first part and the second part and used for detecting whether an external target approaches the folding screen; and

and the control module is connected with the detection module and the at least two proximity sensors and is used for enabling the proximity sensors corresponding to the first part and/or the second part according to the relative positions.

In one embodiment, the relative position includes the first and second portions being upwardly and co-planarly disposed; the control module enables proximity sensors corresponding to the first and second portions in response to the first and second portions being disposed upwardly and coplanar.

In one embodiment, the relative position includes the first portion being located above the second portion;

the control module enables the proximity sensor corresponding to the first portion to disable the proximity sensor corresponding to the second portion in response to the first portion being located over the second portion.

In one embodiment, the relative position includes the second portion being located above the first portion; the control module enables the proximity sensor corresponding to the second portion to disable the proximity sensor corresponding to the first portion in response to the second portion being located over the first portion.

In one embodiment, the proximity sensor includes: the emitting component is driven by the control module to emit detection light; and the receiving assembly is used for receiving the detection light reflected by the external target, converting the received detection light into a digital signal and sending the digital signal to the control module.

In one embodiment, the transmission assembly comprises: the power supply device is connected with the control module and is driven by the control module to output current; a light emitting member for receiving the current and emitting the detection light; and the switch part is connected with the power supply device and the luminous part and is controlled by the control module to be communicated with the power supply device and the luminous part.

In one embodiment, the receiving component comprises: the photoelectric detector is used for receiving the detection light reflected back by the external target and converting the detection light into an initial electric signal; and the proximity sensor is connected with the photoelectric detector, converts the initial electric signal into the digital signal and sends the digital signal to the control module.

In one embodiment, the proximity sensor includes: the signal amplification circuit is connected with the photoelectric detector and converts the initial electric signal into an amplified electric signal;

the sampling hold circuit is connected with the signal amplification circuit and converts the amplified electric signal into an electric signal to be sampled; and

and the analog-to-digital conversion circuit is connected with the sampling holding circuit and is used for converting the electric signal to be sampled into the digital signal.

In one embodiment, the detection module comprises: an angle sensor and/or an acceleration sensor.

According to a second aspect of the present disclosure, there is provided a terminal device comprising: a folding screen, and the proximity detection circuit provided in the first aspect;

the folding screen comprises a first part and a second part which can be folded oppositely;

at least two proximity sensors in the proximity detection circuit are provided corresponding to the first portion and the second portion, respectively.

In one embodiment, a light hole is arranged on the folding screen, and the proximity sensor is arranged corresponding to the light hole; alternatively, the first and second electrodes may be,

a gap is formed in the folding screen, and the proximity sensor is arranged corresponding to the gap; alternatively, the first and second electrodes may be,

the folding screen is provided with a light transmission area, and the proximity sensor is attached to the back of the folding screen corresponding to the light transmission area.

The proximity detection circuit and the terminal equipment provided by the disclosure have at least the following beneficial effects:

confirm the use form of folding screen through detecting the module, control the proximity sensor through the control module according to the use form control of folding screen and enable. Accordingly, the enabled proximity sensor corresponds to the current usage form of the folding screen, so that the proximity sensor can accurately judge whether an external target is close to the folding screen. The proximity detection circuit provided by the embodiment of the disclosure is matched with the folding screen, the detection effect is accurate, and the user experience is good.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a schematic diagram illustrating the construction of a folding screen according to one exemplary embodiment;

FIGS. 2-4 are schematic views illustrating use of a folding screen according to various exemplary embodiments;

FIG. 5 is a schematic diagram of an ambient light detection circuit provided in accordance with an exemplary embodiment;

FIG. 6 is a schematic diagram of an ambient light detection circuit provided in accordance with another exemplary embodiment;

FIG. 7 is a schematic diagram of an ambient light detection circuit provided in accordance with another exemplary embodiment;

FIG. 8 is a schematic circuit diagram illustrating a receiving component in a proximity sensor in accordance with an exemplary embodiment;

FIG. 9 is a schematic diagram illustrating the use of a proximity sensor in accordance with an exemplary embodiment;

fig. 10 to 12 are schematic structural diagrams of terminal devices provided according to different exemplary embodiments.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of the terms "a" or "an" and the like in the description and in the claims of this disclosure do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, the word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprises" or "comprising" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

As used in this disclosure and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

The embodiment of the disclosure provides a proximity detection circuit and a terminal device which can be matched with a folding screen to make up for the blank in the related art. Before describing the structure of the proximity detection circuit, the features of the folded screen that cooperates with the proximity detection circuit will be described.

Fig. 1 is a perspective view of a folding screen shown according to an exemplary embodiment, and fig. 2 to 4 are use configurations of the folding screen shown according to different exemplary embodiments. As shown in fig. 1, the folding screen 100 includes a first portion 110 and a second portion 120 that are foldable relative to each other. The foldable screen 100 is an outer foldable screen, that is, the display surface of the screen is always folded toward the outside. In this way, the user can view the display content of the screen regardless of how the user folds. Based on the above, the folding screen 100 has the following three use forms:

as shown in fig. 2, the first portion 110 and the second portion 120 are unfolded upward and are coplanar, and the foldable screen 100 is in an unfolded state. When the foldable screen 100 is in use, the display surfaces of the first and second portions 110, 120 are both facing the user.

As shown in fig. 3, the first portion 110 and the second portion 120 are folded such that the first portion 110 is located above the second portion 120. In this case, the first portion 110 is a main display portion. Taking the foldable screen 100 as an example, the user holds the second portion 120 and views the display content of the first portion 110.

As shown in fig. 4, the second portion 110 and the second portion 120 are folded such that the second portion 120 is located above the first portion 110. In this case, the second portion 120 is a main display portion. Taking the foldable screen 100 as an example, the user holds the first portion 110 and views the display content of the second portion 120.

Fig. 5 and 6 are schematic diagrams of proximity detection circuits provided according to various exemplary embodiments. The proximity detection circuit provided by the embodiment of the disclosure is used in cooperation with the folding screen shown in fig. 1 to 4. As shown in fig. 5, the proximity detection circuit includes: a detection module 200, at least two proximity sensors 300, and a control module 400.

The detecting module 200 is used for detecting the phase positions of the first portion 110 and the second portion 120 in the foldable screen 100. The relative positions of the first portion 110 and the second portion 120 include an upward coplanar arrangement as shown in FIG. 1, with the first portion 110 being positioned above the second portion 120 as shown in FIG. 2, and the second portion 120 being positioned above the first portion 110 as shown in FIG. 3.

As an example, the detection module 200 includes: an angle sensor (e.g., a gyroscope sensor) and/or an acceleration sensor (e.g., a gravity sensor). The detection module 200 is used for determining the phase positions of the first portion 110 and the second portion 120 by detecting the spatial state parameters (e.g., spatial rotation angle, acceleration, etc.) of the first portion 110 and the second portion 120.

Alternatively, as shown in fig. 6, the at least two detection modules 200 include a first detection module 210 disposed corresponding to the first portion 110 of the foldable screen 100, and a second detection module 220 disposed corresponding to the second portion 120 of the foldable screen 100. In this way, the first detection module 210 is configured to obtain the spatial state parameter of the first portion 110 to determine the spatial state of the first portion 110; the second detecting module 220 is used for obtaining the spatial state parameter of the second portion 120 to determine the spatial state of the second portion 120.

For example, the orientation parameters of the detecting module 200 include values of three coordinate axes, i.e., x-axis, y-axis and z-axis. Wherein, x-axis and y-axis set up and mutually perpendicular along the horizontal direction, and the z-axis points to ground along vertical direction.

When the first detecting module 210 detects that the z-axis parameter in the orientation parameter of the first portion 110 is negative, and the second detecting module 220 detects that the z-axis parameter in the orientation parameter of the second portion 120 is negative, it indicates that the first portion 110 and the second portion 120 are disposed upward and coplanar (as shown in fig. 2).

When the first detecting module 210 detects that the z-axis parameter in the orientation parameters of the first portion 110 is positive, and the second detecting module 220 detects that the z-axis parameter in the orientation parameters of the second portion 120 is negative, it indicates that the first portion 110 is located on the second portion 120 (as shown in fig. 3).

When the first detecting module 210 detects that the z-axis parameter in the orientation parameters of the first portion 110 is negative and the second detecting module 220 detects that the z-axis parameter in the orientation parameters of the second portion 120 is positive, it indicates that the second portion 120 is located on the first portion 110 (as shown in fig. 4).

The proximity sensor 300 is used to detect whether an external object is in proximity to the folding screen 100. In one embodiment, the proximity sensor 300 is a light-sensitive proximity sensor that detects the detection light reflected by an external object to determine whether the external object is close to the folding screen 100.

At least two proximity sensors 300 are disposed corresponding to the first and second portions 110 and 120, respectively. In this way, the proximity sensor 300 provided corresponding to the first portion 110 is used to detect whether an external target approaches the first portion 110; the proximity sensor 300 provided corresponding to the second portion 120 is used to detect whether an external target approaches the second portion 120. At least one proximity sensor 300 is disposed corresponding to the second portion 120 of the folding screen 100 for detecting whether an external object is in proximity to the second portion 120.

The control module 400 is connected to the detection module 200 and the proximity sensor 300, and is configured to enable the proximity sensor 300 corresponding to the first portion 110 and/or the second portion 120 according to the relative position of the first portion 110 and the second portion 120 detected by the detection module 200.

Specifically, the control module 400 enables the proximity sensors 300 corresponding to the first and second portions 110, 120 in response to the detection module 200 detecting that the first and second portions 110, 120 are disposed upwardly and co-planarly (as shown in fig. 2). In this way, the proximity sensor 300 can detect whether an external target approaches the first and second portions 110 and 120.

The control module 400 enables the proximity sensor 300 corresponding to the first portion 110 to disable the proximity sensor 300 corresponding to the second portion 120 in response to the detection module 200 detecting that the first portion 110 is on the second portion 120 (as shown in fig. 3). In this case, the first portion 110 is a main display portion. In this way, it is avoided that the approach of an external object to the second portion 120 affects the display effect of the first portion 110.

The control module 400 enables the proximity sensor 300 corresponding to the second portion 120 to disable the proximity sensor 300 corresponding to the first portion 110 in response to the detection module 200 detecting that the second portion 120 is located on the first portion 110 (as shown in fig. 4). In this case, the second portion 120 is a main display portion. In this way, it is avoided that the approach of an external object to the first portion 110 affects the display effect of the second portion 120.

With the proximity detection circuit provided by the embodiment of the present disclosure, the relative positions of the first portion 110 and the second portion 120 in the foldable screen 100 are determined by the detection module 200, and the control module 400 enables the proximity sensor 300 according to the detection result of the monitoring module 200. In this way, the enabled proximity sensor 300 corresponds to the current usage pattern of the folding screen 100, so that the proximity sensor 300 can accurately determine whether an external target is close to the folding screen 100, and optimize user experience.

Fig. 7 is a schematic diagram of an ambient light detection circuit provided in accordance with another exemplary embodiment. As shown in fig. 7, the proximity sensor 300 includes a transmitting component 310 and a receiving component 320. The emitting element 310 is driven by the control module 400 to emit the detecting light L1. The receiving module 320 receives the detecting light L2 reflected by the external object, and converts the received detecting light L2 into a digital signal D to be sent to the control module 400.

The transmitting assembly 310 includes: a power supply member 311, a light emitting member 312, and a switching member 313.

The power supply device 311 is connected to the control module 400, and is used for driving the output current I by the control module 400. Optionally, the power supply device 311 is a linear regulator to ensure a stable output current I.

The light emitting element 312 emits the detection light L1 under the action of the current I. The detecting Light L1 is infrared Light, and optionally, the Light Emitting element 312 is a Light Emitting Diode (LED) or a vertical cavity surface Emitting Laser (vcsel).

The switch 313 is connected to the output terminal of the power supply 311 and the input terminal of the light emitting element 312, and is controlled by the control module 400 to connect the power supply 311 and the light emitting element 312, so that the light emitting element 312 receives the current I output by the power supply 311.

As an example, the switch 313 is an NPN type transistor, and in this case, the switch 313 includes a base B, a collector C, and an emitter E. The base B of the switching element 313 is connected to the output of the supply means 311 for receiving the current I. The collector C of the switch 313 is connected to the control module 400 for receiving the control signal output by the control module 400 to turn on the base B and the emitter E. The control module 400 is used for driving the power supply device 311 and controlling the base B and the emitter E of the switch 313 to be conducted. Accordingly, the switching member 313 allows the power supply unit 311 to communicate with the light emitting member 312, and the light emitting member 312 receives the current I and emits the detection light L1.

Optionally, the control signal provided by the control module 400 to the switch 313 is a Pulse Width Modulation (PWM) signal composed of high and low levels. When the switching element 313 receives a high level signal, the base B and the emitter E are turned on; when the switching member 313 receives a low level signal, the base B and the emitter E are disconnected. In this way, the light emitting member 312 periodically emits light. And, the light emitting member 312 emits light at a high frequency by adjusting the frequency of the PWM signal. Accordingly, when an external target approaches the folding screen 100, the detection light L1 can be reflected, and the detection accuracy is guaranteed; and reduces the power consumption of the light emitting member 312 by periodic light emission.

Fig. 8 is a circuit schematic diagram illustrating the receiving component 320 in the proximity sensor 300 according to an exemplary embodiment. As shown in fig. 8, the receiving component 320 includes: a photodetector 321 and a proximity sensor 322.

The photodetector 321 is used to receive the detection light L2 reflected back by the external object and convert the received detection light L2 into an initial electrical signal a 1. Alternatively, the photodetector 321 is a single photodiode, or an array of photodiodes.

The proximity sensor 322 is connected to the photodetector 321, converts the initial electrical signal a1 into a digital signal D, and transmits the digital signal D to the control module 400.

In one example, the proximity sensor 322 includes signal amplification circuitry 3221, sample and hold circuitry 3222, and analog-to-digital conversion circuitry 3223.

The signal amplifying circuit 3221 is connected to the photodetector 321, and converts the initial electrical signal a1 into an amplified electrical signal a 2. Alternatively, as shown in fig. 7, the signal amplifying circuit 3221 includes a first-stage amplifying circuit 3221a and a second-stage amplifying circuit 3221 b. The primary amplifying circuit 3221a converts the initial electrical signal a1 into an intermediate electrical signal A3. This process removes the bias voltage caused by the dark current and parasitic resistance generated by the photodetector 321. The two-stage amplifying circuit 3221b amplifies the intermediate electrical signal A3 to obtain an amplified electrical signal a 2.

The sample-and-hold circuit 3222 is connected to the signal amplification circuit 3221, and converts the amplified electrical signal a2 into an electrical signal a4 to be sampled. The analog-to-digital conversion circuit 3223 is connected to the sample-and-hold circuit 3222, and converts the electrical signal a4 to be sampled into a digital signal D. A certain conversion time is required when the analog-to-digital conversion circuit 3223 performs analog-to-digital conversion on the electrical signal a4 to be sampled. During the conversion time, the electrical signal a4 to be sampled is kept substantially unchanged by the sample-and-hold circuit 3223 to ensure the conversion accuracy.

Fig. 9 is a usage scenario diagram of a proximity sensor 300 provided in accordance with an exemplary embodiment. As shown in fig. 9, the proximity sensor 300 is used in the following principle:

the emitting member 310 emits the detection light L1, and the detection light L1 is distributed in the region Z1. The receiving unit 320 can receive the detection light L2 entering the region Z2. The region Z1 and the region Z2 have an overlapping region Z3, and when an external object (for example, a finger shown in fig. 9) is located in the overlapping region Z3, the detection light L1 is incident on the external object and reflected by the external object to form the detection light L2. Further, the receiving module 320 converts the detection light L2 into a digital signal.

Moreover, the digital signal of the receiving module 320 is positively correlated with the intensity of the detection light L2, and the distance between the external object and the folding screen within the overlapping region Z3 is negatively correlated with the intensity of the detection light L2. Therefore, the digital signal acquired by the proximity sensor 300 can reflect the distance of the external object to the folding screen.

Optionally, the proximity sensor 300 further includes a retaining wall 330 disposed between the receiving assembly 310 and the transmitting assembly 320. The blocking wall 330 prevents the detection light L1 emitted by the emitting element 310 from being directly received by the receiving element 320 without being reflected, thereby reducing the noise floor of the detection result of the proximity sensor 300. Furthermore, the wall 330 also positions the overlapping region Z3 close to the back side of the folding screen 100 (the side of the folding screen 100 where no image is displayed), in this way, the quality of the signal received by the receiving component 320 is optimized, and the detection result of the proximity sensor 300 is further optimized.

In a second aspect, an embodiment of the present disclosure provides a terminal device. Fig. 10, 11, 12 are schematic structural diagrams of terminal devices shown according to different exemplary embodiments.

As shown in fig. 10 to 12, the terminal device includes: a folding screen 100, and a proximity detection circuit as provided in the first aspect above.

The folding screen 100 includes a first portion 110 and a second portion 120 that are foldable relative to each other. At least one proximity sensor 300 of the proximity detection circuit is disposed corresponding to the first portion 110, and at least one proximity sensor 300 is disposed corresponding to the second portion 120.

There are various ways to cooperate the folding screen 100 with the proximity sensor 300.

As an example, as shown in fig. 10, a light-transmitting hole 130 is provided on the folding screen, and a proximity sensor 300 is provided corresponding to the light-transmitting hole 130.

As one example, as shown in fig. 11, a slit 140 is provided on the folding screen (for example, the slit 140 is provided in a black border area between the folding screen 100 and the middle frame of the terminal device), and the proximity sensor 300 is provided corresponding to the slit 140.

As an example, as shown in fig. 12, a light-transmitting region 150 is provided on the folding screen, and a proximity sensor 300 is attached to the back of the folding screen 100 corresponding to the light-transmitting region 150.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.