WO2019000422A1

WO2019000422A1 - Distance measurement device and method, and flexible display device

Info

Publication number: WO2019000422A1
Application number: PCT/CN2017/091239
Authority: WO
Inventors: 夏新元; 杨金辉
Original assignee: 深圳市柔宇科技有限公司
Priority date: 2017-06-30
Filing date: 2017-06-30
Publication date: 2019-01-03
Also published as: CN108700399B; CN108700399A

Abstract

A distance measurement device (30), a distance measurement method, and a flexible display device. The distance measurement device (30) is used for measuring a distance between a first stretch structure (10) and a second stretch structure (20). The first stretch structure (10) comprises a magnetic guide rail (101). The distance measurement device (30) comprises N coils (311, 312, ... , 31N). A first coil (311) is fixedly wound around the second stretch structure (20). The first coil (311) can be any one of the N coils (311, 312, ... , 31N), wherein N is a positive integer greater than or equal to 2. The distance measurement device (30) is used for detecting an electromotive force at two ends of the first coil (311). When an absolute value of the electromotive force at the two ends of the first coil (311) is the highest value among the N coils (311, 312, ..., 31N), the distance between the first stretch structure (10) and the second stretch structure (20) is determined according to the position in which the first coil (311) is fixed on the second stretch structure (20). The distance measurement device (30) reduces power consumption during measurement of a stretch or contraction distance of a flexible display device and improves measurement accuracy.

Description

Distance measuring device, distance measuring method and flexible display device

Technical field

The present invention relates to the field of display technologies, and in particular, to a distance measuring device, a distance measuring method, and a flexible display device.

Background technique

The flexible display device (for example, a flexible display screen) can be stretched and shrunk according to user requirements, which is convenient for the user. The display area of the flexible display device also changes during the stretching and contraction of the flexible display device. Therefore, it is necessary to obtain the distance of stretching and contraction of the flexible display device to display a display screen that is adapted to the display area size of the display device.

At present, the distance between the stretching and contraction of the flexible display device is often measured by optical measurement (for example, infrared measurement). For example, infrared measurement requires additional infrared light source for active measurement, high power consumption, and When the flexible display device is rapidly stretched and shrunk, the measurement accuracy is difficult to ensure.

Summary of the invention

Embodiments of the present invention provide a distance measuring device, a distance measuring method, and a flexible display device, which can save power consumption when measuring the distance of stretching and contraction of the flexible display device, and can improve measurement accuracy.

A first aspect of an embodiment of the present invention discloses a distance measuring device for measuring a distance between a first tensile structure and a second tensile structure, the first tensile structure including a magnetic guide rail. The distance measuring device includes N coils, the first coil is fixedly wound on the second tensile structure, the first coil is any one of the N coils, and N is a positive integer greater than or equal to 2. ;

The distance measuring device is configured to detect an electromotive force at both ends of the first coil, and when the absolute value of the electromotive force at the two ends of the first coil is a maximum value of the N coils, according to the first coil A position on the second tensioning structure determines a distance between the first tensile structure and the second tensile structure.

A second aspect of the embodiments of the present invention discloses a distance measurement method, which is applied to the first embodiment of the present invention. The distance measuring device of the aspect, the distance measuring device is configured to measure a distance between the first tensile structure and the second tensile structure, the distance measuring device comprises N coils, and the first coil is fixedly wound around In the second tensile structure, the first coil is any one of the N coils, and N is a positive integer greater than or equal to 2;

The method includes:

The distance ranging device detects an electromotive force at both ends of the N coils;

When detecting that the absolute value of the electromotive force at both ends of the first coil is the maximum value among the N coils, the distance ranging device is fixed according to the position of the first coil fixed on the second pulling structure A distance between the first tensile structure and the second tensile structure is determined.

A third aspect of the present invention discloses a flexible display device comprising a flexible display screen, a first tensile structure, a second tensile structure, and a distance measuring device according to the first aspect of the present invention.

The distance measuring device in the embodiment of the invention can be used to measure the distance between the first tensile structure and the second tensile structure according to the principle of electromagnetic induction. When a stretching and contracting motion occurs between the first tensile structure and the second tensile structure, the coil in the distance measuring device generates an induced electromotive force, and the distance measuring device obtains the current first pulling by measuring the magnitude of the induced electromotive force in the coil. The distance between the stretched structure and the second stretched structure. Since the coil can sensitively sense the induced electromotive force, the induced electromotive force is generated at a high speed, and the measurement accuracy can be improved; and the embodiment of the invention does not need to use the power consuming device, and the first tensile structure and the second tensile force are automatically detected by the induced electromotive force generated by the coil. The distance between the structures can save power.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic structural diagram of a distance measuring device according to an embodiment of the present invention;

2 is a schematic structural diagram of another distance measuring device according to an embodiment of the present invention;

3 is a schematic structural diagram of a detection circuit disclosed in an embodiment of the present invention;

4 is a schematic structural view of a relative movement between a magnetic guide rail and a detection circuit according to an embodiment of the present invention;

FIG. 5 is a schematic structural view showing another relative movement between a magnetic guide rail and a detection circuit according to an embodiment of the present invention; FIG.

6 is a schematic structural view showing another relative movement between a magnetic guide rail and a detection circuit according to an embodiment of the present invention;

7 is a schematic structural view of a magnetic guide rail according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of another distance measuring device according to an embodiment of the present invention; FIG.

9 is a schematic flow chart of a distance measurement method according to an embodiment of the present invention;

FIG. 10 is a schematic flow chart of another distance measuring method disclosed in an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Embodiments of the present invention provide a distance measuring device, a distance measuring method, and a flexible display device, which can save power consumption when measuring the distance of stretching and contraction of the flexible display device, and can improve measurement accuracy. The details are described below separately.

Referring to FIG. 1 , FIG. 1 is a schematic structural diagram of a distance measuring device according to an embodiment of the present invention. As shown in FIG. 1 , the distance measuring device 30 is configured to measure a first tensile structure 10 and a second tensile structure 20 . The distance between the first tensile structure 10 includes a magnetic guide rail 101, and the distance measuring device 30 includes N coils (311, 312, ..., 31N as shown in Fig. 1), and the first coil 311 is fixedly wound around In the second tensile structure 20, the first coil is any one of N coils, and N is a positive integer greater than or equal to 2;

The distance measuring device 30 is configured to detect the electromotive force at both ends of the first coil 311. When the absolute value of the electromotive force at the two ends of the first coil 311 is the maximum value among the N coils, the first coil 311 is fixed to the second pulling structure according to the first coil 311. The position on 20 determines the distance between the first tensile structure 10 and the second tensile structure 20.

It should be noted that the N coils (311, 312, ..., 31N) in Fig. 1 are not closed coils, and each coil includes two ends. When the magnetic flux passing through a coil changes, the coil has An induced electromotive force is generated at both ends.

The distance measuring device shown in FIG. 1 is for measuring the first tensile knot according to the electromagnetic induction principle of the coil The distance between the structure and the second tensile structure, since the coil can sensitively induce the induced electromotive force, the induced electromotive force is fast, and the measurement accuracy can be improved; and the embodiment of the present invention does not need to use the power consuming device, and the induced electromotive force generated by the coil Automatically detecting the distance between the first tensile structure and the second tensile structure can save power.

Referring to FIG. 2, FIG. 2 is a schematic structural diagram of another distance measuring device according to an embodiment of the present invention. As shown in FIG. 2, the distance measuring device 30 is configured to measure a first tensile structure 10 and a second tensile structure. 20, the first tensile structure 10 includes a magnetic rail 101, FIG. 2, and the second tensile structure includes M non-magnetic rails (201, 202, ..., 20M as shown in FIG. 2). A sliding slot 2011 is formed between the non-magnetic rail 201 and the second non-magnetic rail 202. The magnetic rail 101 is slidably connected to the sliding slot. The first non-magnetic rail 201 and the second non-magnetic rail 202 are any two of the M non-magnetic rails. An adjacent non-magnetic rail; M is a positive integer greater than or equal to 2.

The distance measuring device 30 includes N coils (311, 312, ..., 31N as shown in FIG. 2) and N sampling resistors (321, 322, ... connected to the N coils in one-to-one correspondence). 32N) and N detectors (331, 332, ..., 33N) connected in one-to-one correspondence with the N sampling resistors, the first coil 311 and the first sampling resistor 321 are connected in series to form a first detection circuit 301, first The coil 311 is any one of the N coils. The first sampling resistor 321 corresponds to the first coil 311. The first coil 311 surrounds the first non-magnetic rail 201, the second non-magnetic rail 202 and the chute 2011, and the first voltage. The detecting 331 is for detecting the voltage across the first sampling resistor 321 , and the first detector 331 corresponds to the first sampling resistor 321 .

Wherein, any two of the N coils have the same number of turns, and any two of the N sampling resistors have the same resistance, and N is a positive integer greater than or equal to 2.

The distance measuring device 30 is configured to detect, when the first detector 331 detects that the absolute value of the voltage difference between the first sampling resistor 321 is the maximum value of the absolute values of the voltage differences detected by the N detectors, according to the detection Corresponding relationship between the loop and the distance acquires a target distance corresponding to the first detection loop 301.

The number of detectors in Figure 2 is the same as the number of coils and the number of sampling resistors, all N. In some possible implementations, the number of detectors may be less than N, for example, P (P < N) That is, one detector can have multiple detection ends, and one detector can be used to simultaneously detect multiple coils. It is possible to reduce the number of detectors used and save the cost of the distance measuring device.

In the embodiment of the present invention, the distance measuring device 30 includes a plurality of detecting circuits and a plurality of detectors, each Each detection loop is composed of a coil and a sampling resistor connected in series, wherein the coil and the sampling resistor are connected in series to form a loop, and two ends of the detector are respectively connected to both ends of the sampling resistor. The detector can be a voltage detector for detecting the voltage across the sampling resistor. The two ends of the detector can also be respectively connected to two ends of a coil for detecting the induced electromotive force at both ends of the coil. The detector can also be a current detector for detecting the current in the detection loop. Preferably, the plurality of detection circuits included in the distance measuring device 30 are disposed exactly the same to ensure the accuracy of the test results. For each coil in the detection circuit, the same number of turns and the same material are required (for example, both are copper). The quality coil), the same diameter, set the same resistance for the sampling resistor in each detection loop. At the same time, all the detectors in the distance measuring device 30 need to be set to the same measurement accuracy to ensure the accuracy of the measurement results.

The N coils included in the distance measuring device 30 are generally wound around the adjacent two non-magnetic rails 202 of the second tensile structure 20 such that the size (area) of each coil is the same to ensure the accuracy of the distance measurement results. Further, the magnetic rail 101 in the practice of the present invention is perpendicular to the plane in which the N coils included in the distance measuring device 30 are located. Preferably, if the N coils are all center, the center of the N coils is located on the extension line of the magnetic rail 101; if the N coils are square, the centers of the N coils are located on the extension of the magnetic rail 101. Preferably, in order to ensure the reliability of the magnetic rail 101, the magnetic rail 101 may be composed of a permanent magnet material, that is, the magnetic rail 101 may be a permanent magnet rail.

Optionally, the plurality of coils included in the distance measuring device 30 can be equally spaced to further ensure the accuracy of the distance measurement result. For example, if the distance between two adjacent coils is set to 1 mm (mm), the measurement error is 1 mm, if the distance between adjacent two coils is set to 1-5 mm (mm) Between, the measurement error is 5mm. Of course, after the coils are equidistantly disposed, it is also convenient to measure the relative speed between the first tensile structure 10 and the second tensile structure 20 during the movement.

The distance measuring device 30 is provided with a plurality of detecting circuits for accurately measuring the distance between the first tensile structure 10 and the second tensile structure 20. Generally, the number of detecting circuits provided by the distance measuring device 30 is larger, the distance The more accurate the measurement results. For example, if the distance between two adjacent detection circuits is set to 1 mm (mm), the measurement error is 1 mm, and if the distance between two adjacent detection circuits is set to 2 mm (mm), Then the measurement error is 2mm.

Optionally, the first tensile structure 10 further includes a plurality of non-magnetic rails (such as 102, 103, etc. shown in FIG. 2). The plurality of non-magnetic rails included in the first tensile structure 10 can support the flexible display device At the same time, since the plurality of non-magnetic guide rails are not magnetic, electromagnetic interference is not caused to the magnetic rails 101, and the accuracy of the measurement results of the distance measuring device 30 can be further ensured.

The working principle of the embodiment of the present invention will be described below with reference to FIG. 3. Specifically, FIG. 3 is a schematic structural diagram of a detection loop disclosed in an embodiment of the present invention. As shown in FIG. 3, FIG. 3 is described by taking a first detection loop as an example. The first detection circuit 301 in FIG. 3 includes a first coil 311 and a first sampling resistor 32. The first coil 311 is connected in series with the first sampling resistor 321 , and the first detector 331 is connected in parallel with the first sampling resistor 321 , the first detector The two ends of the first sampling resistor 321 are respectively connected to the two ends of the first sampling resistor 321 , and the first detector 331 is configured to detect the voltage difference between the first sampling resistors 321 . It can be understood that the voltage difference between the first sampling resistor 321 is the induced electromotive force generated by the first coil 311. As shown in FIG. 3, if the voltage difference between the first sampling resistor 321 is defined as the voltage difference between the right end 3212 and the left end 3211 of the first sampling resistor 321, the induced electromotive force generated by the first coil 311 is defined as the first coil 311. The voltage difference between the right end 3112 and the left end 3111. Taking FIG. 3 as an example, the direction of the magnetic flux passing through the first coil 311 is the vertical paper facing outward, and when the magnetic flux passing through the first coil 311 is increased, the voltage of the right end 3112 of the first coil 311 is higher than the voltage of the left end 3111, The induced electromotive force generated by a coil 311 is a positive value; the voltage of the right end 3212 of the first sampling resistor 321 is higher than the voltage of the left end 3211, and the voltage difference between the right end 3212 and the left end 3211 of the first sampling resistor 321 is a positive value. When the magnetic flux passing through the first coil 311 is decreased, the voltage of the right end 3112 of the first coil 311 is lower than the voltage of the left end 3111, and the induced electromotive force generated by the first coil 311 is a negative value; the voltage of the right end 3212 of the first sampling resistor 321 Above the voltage of the left end 3211, the voltage difference between the right end 3212 and the left end 3211 of the first sampling resistor 321 is a negative value.

When the first tensile structure 10 and the second tensile structure 20 are relatively moved, according to Faraday's law of electromagnetic induction E=-nΔΦ/Δt, it can be seen that the induced electromotive force generated by the first coil 311 is proportional to the number of turns of the first coil 311. It is proportional to the rate of change of the magnetic flux in the first coil 311. If the first detector 331 detects that the absolute value of the voltage difference across the first sampling resistor 321 is the maximum value of the absolute values of the voltage differences detected by the N detectors, all the coils in the embodiment of the present invention The number of turns is the same, and it is determined that the rate of change of the magnetic flux in the first detection circuit 301 is the largest. When the first tensile structure 10 and the second tensile structure 20 are relatively moved, the rate of change of the magnetic flux in each detection circuit is not all the same. When the relative velocity of the first tensile structure 10 and the second tensile structure 20 is constant, the amount of change in the magnetic flux within the detection circuit is closely related to the current position of the detection circuit. As shown in Figure 4, in (a) of Figure 4. When the distance between the magnetic rail 101 and the first detecting circuit 301 is long, the amount of change in the magnetic flux in the first detecting circuit 301 is small; in (b) of FIG. 4, the magnetic rail 101 and the first detecting circuit 301 When the distance is relatively close, the amount of change of the magnetic flux in the first detection circuit 301 is large; in (c) of FIG. 4, when the magnetic guide 101 completely passes through the first detection circuit 301, the first detection circuit 301 The amount of change in the magnetic flux is small, and when the distance between the magnetic rail 101 and the second detection circuit 302 is relatively small, the amount of change in the magnetic flux in the second detection circuit 302 is large. It can be seen that the distance between the magnetic rail 101 and the detection loop can be determined by detecting the magnitude of the voltage difference across the sampling resistor. Since each detection loop is fixedly set, the distance between any two detection loops is determined. The distance between the first tensile structure and the second tensile structure can be determined.

When the first tensile structure 10 and the second tensile structure 20 are relatively stationary, the voltage difference across all of the sampling resistors in the distance measuring device 30 is zero. At this time, the distance measuring device 30 takes the distance measured last time as the distance between the current first tensile structure 10 and the second tensile structure 20.

Optionally, the distance measuring device 30 is further configured to: when the first detector 331 detects that the voltage difference between the first sampling resistor 321 is not zero, determining that the first tensile structure 10 and the second tensile structure 20 are Relative motion state.

Optionally, as shown in FIG. 5, one end of the magnetic rail 101 near the chute 2011 is a north pole (N), and one end of the magnetic rail 101 away from the chute 2011 is a south pole (S). At this time, as shown in (a) of FIG. 5, when the first detector 331 detects that the voltage difference across the first sampling resistor 321 is a negative value, the distance measuring device 30 determines the first tensile structure 10 and the first The two tensile structures 20 are in a state of back movement, and the first tensile structure 10 and the second tensile structure 20 are stretched away from each other.

As shown in (b) of FIG. 5, when the first detector 331 detects that the absolute value of the voltage difference across the first sampling resistor 321 is a positive value, the distance measuring device 30 determines the first tensile structure 10 and the first The two tensile structures 20 are in a state of relative motion, and at this time, the first tensile structure 10 and the second tensile structure 20 perform a contracting action close to each other.

Optionally, as shown in FIG. 6 , one end of the magnetic rail 101 adjacent to the chute 2011 is a south pole (S) north pole (N), and one end of the magnetic rail 101 away from the chute 2011 is a north pole (N). At this time, as shown in (a) of FIG. 6, when the first detector 331 detects that the absolute value of the voltage difference across the first sampling resistor 321 is a negative value, the distance measuring device 30 determines the first tensile structure. 10 and the second tensile structure 20 are in a state of relative motion, and at this time, the first tensile structure 10 and the second tensile structure 20 perform a contracting motion away from each other.

As shown in (b) of FIG. 6, when the first detector 331 detects that the absolute value of the voltage difference across the first sampling resistor 321 is a positive value, the distance measuring device 30 determines the first tensile structure 10 and the first The two tensile structures 20 are in a state of backward movement, in which case the first tensile structure 10 and the second tensile structure 20 are subjected to a stretching action close to each other.

Both ends of the first sampling resistor 321 in FIGS. 5 and 6 correspond to both ends of the first sampling resistor 321 in FIG.

The correspondence between the detection loop and the distance may be stored in advance in a memory (eg, a non-volatile memory) of the distance measuring device 30. Please refer to Table 1. Table 1 is a correspondence table between the detection loop and the distance disclosed in the embodiment of the present invention.

Table 1

As can be seen from FIG. 1 and Table 1, when the absolute value of the voltage difference of the first sampling resistor 321 in the first detection circuit 301 (the first detection circuit 301 includes the first sampling resistor 321 of the first coil 311) is detected, When the value is maximum, it can be determined that the distance between the first tensile structure 10 and the second tensile structure 20 is 7 cm (cm); when the second detection circuit 302 is detected (the second detection circuit 302 includes the second coil 312 and When the absolute value of the voltage difference of the second sampling resistor 322 in the second sampling resistor 322) is maximum, the distance between the first tensile structure 10 and the second tensile structure 20 can be determined to be 6 cm (cm); Wait.

Optionally, as shown in FIG. 3, the first detector 331 is further configured to detect an induced electromotive force generated by the first coil 311.

The distance measuring device 30 is further configured to determine that the first tensile structure 10 and the second tensile structure 20 are in relative motion when the first detector 331 detects that the absolute value of the induced electromotive force generated by the first coil 311 is not zero. .

If one end of the magnetic rail near the chute is north pole (N), one end of the magnetic rail away from the chute is a south pole (S); the distance measuring device 30 determines that the first tensile structure 10 and the second tensile structure 20 are in relative motion, Specifically:

When the first detector 311 detects that the absolute value of the induced electromotive force generated by the first coil 311 is a negative value, the distance measuring device 30 determines that the first tensile structure 10 and the second tensile structure 20 are in a back motion state;

When the first detector 311 detects that the absolute value of the induced electromotive force generated by the first coil 311 is a positive value, the distance measuring device 30 determines that the first tensile structure 10 and the second tensile structure 20 are in a relative motion state.

Optionally, if one end of the magnetic rail adjacent to the chute is a south pole (S), one end of the magnetic rail away from the chute is a north pole (N); the distance measuring device 30 determines that the first tensile structure 10 and the second tensile structure 20 are Relative motion state, specifically:

When the first detector 311 detects that the absolute value of the induced electromotive force generated by the first coil 311 is a negative value, the distance measuring device 30 determines that the first tensile structure 10 and the second tensile structure 20 are in a relative motion state;

When the first detector 311 detects that the absolute value of the induced electromotive force generated by the first coil 311 is a positive value, the distance measuring device 30 determines that the first tensile structure 10 and the second tensile structure 20 are in a back motion state.

Optionally, please refer to FIG. 7. FIG. 7 is a schematic structural diagram of a magnetic guide rail according to an embodiment of the present invention. As shown in FIG. 7, N coils are equidistantly disposed on the first non-magnetic rail 201 and the second non-magnetic. On the guide rail 202. N annular grooves are equally spaced from the first non-magnetic guide 201 and the second non-magnetic guide 202, and N annular grooves are used for winding N coils. As shown in FIG. 7, N annular grooves 2011 are provided in the first non-magnetic guide rail 201, and N annular grooves 2021 are provided on the second non-magnetic guide rail 202.

Alternatively, the annular groove can be replaced by other grooves that can be fixed to the wound coil.

N annular grooves are equally spaced on the first non-magnetic rail 201 and the second non-magnetic rail 202, and the position of the coil can be fixed by the annular groove to prevent the first non-magnetic rail 201 and the second non-magnetic rail 202 from moving during the movement. The position of the coil changes, which in turn affects the accuracy of the measurement results.

Optionally, as shown in FIG. 8, FIG. 8 is a schematic structural diagram of another distance measuring apparatus according to an embodiment of the present invention. As shown in FIG. 8, the distance measuring device 30 includes N detection circuits (as shown in FIG. 8). 301, 302, ..., 30N), N detectors (331, 332, ..., 33N as shown in Fig. 8), the distance measuring device 30 further includes a processor 34 and a memory 35, the memory 35 For storing the correspondence between the detection loop and the distance, the processor 34 is configured to acquire the target distance corresponding to the first detection loop according to the correspondence between the detection loop and the distance.

The distance measuring device in the practice of the present invention is not only used to measure the distance between the first tensile structure and the second tensile structure, but also can be applied to any structure having a rail fit, any result having a sliding connection fit. The embodiment of the invention is not limited.

Please refer to FIG. 9. FIG. 9 is a schematic flowchart diagram of a distance measurement method according to an embodiment of the present invention. The method shown in FIG. 9 is applied to the apparatus shown in FIG. 1. As shown in FIG. 9, the method includes the following steps.

901. The distance measuring device detects the electromotive force at both ends of the N coils.

902. When detecting that the absolute value of the electromotive force at the two ends of the first coil is the maximum value among the N coils, the distance ranging device determines the first tensile structure and the position according to the position where the first coil is fixed on the second pulling structure. The distance between the two tensile structures.

Optionally, the method further includes the following steps:

Optionally, the method can also estimate the relative velocity between the first stretching result and the second stretching result by multiple measurements.

In the embodiment of the present invention, the distance between the first tensile structure and the second tensile structure is measured according to the electromagnetic induction principle of the coil. Since the coil can sensitively induce the induced electromotive force, the induced electromotive force is generated at a high speed, and the measurement can be improved. Accuracy; and the embodiment of the present invention does not require the use of a power consuming device, and the induced electromotive force generated by the coil automatically detects the distance between the first tensile structure and the second tensile structure, thereby saving power consumption.

Please refer to FIG. 10. FIG. 10 is a schematic flowchart diagram of another distance measurement method according to an embodiment of the present invention. The method shown in FIG. 10 is applied to the apparatus shown in FIG. 2, as shown in FIG. .

1001. The distance measuring device detects a voltage difference between the two sampling resistors.

1002. When the first detector detects that the absolute value of the voltage difference between the first sampling resistor is the maximum value of the absolute values of the voltage differences across the N sampling resistors, the distance measuring device is configured according to the detection loop and the distance. The corresponding relationship acquires the target distance corresponding to the first detection loop.

In the embodiment of the present invention, the distance measuring device can separately detect N sampling powers by using N detectors. The voltage difference between the two ends of the resistor. When the first detector detects that the absolute value of the voltage difference across the first sampling resistor is the maximum value of the absolute values of the voltage differences across the N sampling resistors, according to the principle of electromagnetic induction, it indicates that the first time passes through the first The detection circuit (including the first coil and the first sampling resistor) has the largest rate of change of the magnetic flux, and the position of the first detection circuit having the largest rate of change of the magnetic flux is fixed, and can be estimated by the position of the maximum change rate of the magnetic flux of the first detection circuit. (ie, according to the correspondence between the detection loop and the distance) the distance between the first tensile structure and the second tensile structure.

Optionally, the method further includes the following steps:

When the distance measuring device detects that the voltage difference across the at least one sampling resistor in the N sampling resistors is not zero, it is determined that the first tensile structure and the second tensile structure are reversely moved. Among them, the reverse motion includes relative motion and back motion.

Embodiments of the present invention also disclose a flexible display device including a flexible display screen, a first tensile structure, a second tensile structure, and a distance measuring device. The first tensile structure and the second tensile structure are used to carry the flexible display screen to support stretching and contraction of the flexible display screen. When the first tensile structure and the second tensile structure undergo an stretching motion, the flexible display screen is correspondingly unfolded, and the pull between the first tensile structure and the second tensile structure can be displayed on the flexible display screen. Stretching distance. When the first tensile structure and the second tensile structure undergo a contraction motion, the flexible display screen is correspondingly stowed, and the contraction between the first tensile structure and the second tensile structure can be displayed on the flexible display screen. distance. In the flexible display device of the embodiment of the invention, the user can stretch and contract the first tensile structure and the second tensile structure to realize the enlargement and reduction of the flexible display screen, and can accurately detect the first pull in real time. The stretching distance or contraction distance between the stretched structure and the second stretched structure improves the user experience of the user using the flexible display device.

The foregoing provides a detailed description of the solution provided by the embodiments of the present invention. The principles and embodiments of the present invention are described in the specific examples. The description of the above embodiments is only for helping to understand the method and the core idea of the present invention. At the same time, the description of the present invention is not limited to the scope of the present invention.

Claims

A distance measuring device, wherein the distance measuring device is configured to measure a distance between a first tensile structure and a second tensile structure, the first tensile structure comprising a magnetic guide, the distance measuring The device includes N coils, the first coil is fixedly wound on the second tensile structure, the first coil is any one of the N coils, and N is a positive integer greater than or equal to 2;

The distance measuring device is configured to detect an electromotive force at both ends of the first coil, and when the absolute value of the electromotive force at the two ends of the first coil is a maximum value of the N coils, according to the first coil A position on the second tensioning structure determines a distance between the first tensile structure and the second tensile structure.
The distance measuring device according to claim 1, wherein the second tensile structure comprises M non-magnetic rails, and a sliding groove is formed between the first non-magnetic rail and the second non-magnetic rail, the magnetic rail Slidably connected to the sliding slot, the first non-magnetic rail and the second non-magnetic rail are non-magnetic rails adjacent to any two of the M non-magnetic rails; M is greater than or equal to 2 Integer.
The distance measuring device according to claim 2, wherein the distance measuring device further comprises N sampling resistors correspondingly connected to the N coils and P detectors correspondingly connected to the N sampling resistors The first coil and the first sampling resistor are connected in series to form a first detecting circuit, the first sampling resistor corresponds to the first coil, and the first coil surrounds the first non-magnetic rail, the second coil a non-magnetic rail and the chute, a first detector for detecting a voltage across the first sampling resistor, the first detector corresponding to the first sampling resistor, P being a positive integer;

The distance measuring device is further configured to: when the first detector detects that an absolute value of a voltage difference between the first sampling resistor is in an absolute value of a voltage difference detected by the N detectors At the maximum value, the target distance corresponding to the first detection loop is obtained according to the correspondence between the detection loop and the distance.
The distance measuring device according to claim 3, wherein the distance measuring device is further configured to: when the first detector detects an absolute value of a voltage difference between the first sampling resistor When it is not zero, it is determined that the first tensile structure and the second tensile structure are in a relative motion state.
The distance measuring device according to claim 4, wherein if one end of the magnetic rail adjacent to the chute is north pole, one end of the magnetic rail away from the chute is a south pole; the distance measuring device determines The first tensile structure and the second tensile structure are in relative motion state, specifically:

When the voltage difference between the two sampling resistors is a negative value, the distance measuring device determines that the first tensile structure and the second tensile structure are in a back motion state;

The distance measuring device determines that the first tensile structure and the second tensile structure are in a relative motion state when a voltage difference across the first sampling resistor is a positive value.
The distance measuring device according to claim 4, wherein if one end of the magnetic rail adjacent to the chute is a south pole, an end of the magnetic rail away from the chute is a north pole; the distance measuring device determines The first tensile structure and the second tensile structure are in relative motion state, specifically:

When the voltage difference between the first sampling resistor is a negative value, the distance measuring device determines that the first tensile structure and the second tensile structure are in a relative motion state;

The distance measuring device determines that the first tensile structure and the second tensile structure are in a back motion state when a voltage difference across the first sampling resistor is a positive value.
The distance measuring device according to claim 3, characterized in that

The first detector is further configured to detect an induced electromotive force generated by the first coil;

The distance measuring device is further configured to determine the first tensile structure and the second tensile when the first detector detects that an absolute value of an induced electromotive force generated by the first coil is not zero The structure is a relative motion state.
The distance measuring device according to claim 7, wherein if one end of the magnetic rail adjacent to the chute is north pole, one end of the magnetic rail away from the chute is a south pole; the distance measuring device determines The first tensile structure and the second tensile structure are in relative motion state, The body is:

When the induced electromotive force generated by the first coil is a negative value, the distance measuring device determines that the first tensile structure and the second tensile structure are in a back motion state;

The distance measuring device determines that the first tensile structure and the second tensile structure are in a relative motion state when the induced electromotive force generated by the first coil is a positive value.
The distance measuring device according to claim 7, wherein if one end of the magnetic rail adjacent to the chute is a south pole, one end of the magnetic rail away from the chute is a north pole; the distance measuring device determines The first tensile structure and the second tensile structure are in relative motion state, specifically:

When the induced electromotive force generated by the first coil is a negative value, the distance measuring device determines that the first tensile structure and the second tensile structure are in a relative motion state;

The distance measuring device determines that the first tensile structure and the second tensile structure are in a back motion state when the induced electromotive force generated by the first coil is a positive value.
The distance measuring device according to any one of claims 1 to 9, characterized in that the number of turns of any two of the N coils is the same, and the resistance of any two of the N sampling resistors is the same .
The distance measuring device according to any one of claims 3 to 10, wherein the N coils are equidistantly disposed on the first non-magnetic rail and the second non-magnetic rail.
The distance measuring device according to claim 11, wherein the first non-magnetic rail and the second non-magnetic rail are equidistantly disposed with N annular grooves, and the N annular grooves are used for winding the N coils.
The distance measuring device according to any one of claims 3 to 12, wherein the distance measuring device further comprises a processor and a memory, wherein the memory is configured to store a correspondence between the detection loop and the distance, The processor is configured to acquire according to the correspondence between the detection loop and the distance The target distance corresponding to the first detection loop.
A distance measuring method for use in a distance measuring device according to any one of claims 1 to 13, characterized in that the distance measuring device is for measuring a distance between the first tensile structure and the second tensile structure The first tensile structure includes a magnetic guide, the distance measuring device includes N coils, and the first coil is fixedly wound on the second tensile structure, and the first coil is in the N coils Any one of them, N is a positive integer greater than or equal to 2;

The method includes:

The distance ranging device detects an electromotive force at both ends of the N coils;

When detecting that the absolute value of the electromotive force at both ends of the first coil is the maximum value among the N coils, the distance ranging device is fixed according to the position of the first coil fixed on the second pulling structure A distance between the first tensile structure and the second tensile structure is determined.
The method according to claim 14, wherein when said distance measuring means detects that the electromotive force at both ends of said at least one of said N coils is not zero, determining said first tensile structure and said The second tensile structure undergoes relative motion.
A flexible display device comprising a flexible display screen, a first tensile structure, a second tensile structure, and the distance measuring device according to any one of claims 1-13.