Angle measurement method, control chip, and display device

Abstract

An angle measurement method, which is applied to a foldable display device (1). The display device (1) comprises a first display section (10) and a second display section (20) which are symmetrical after folding, wherein two first sensing regions (11, 21) and two second sensing regions (12, 22) are respectively located in the first display section (10) and the second display section (20). The display device (1) further comprises a plurality of electrodes, wherein the plurality of electrodes are respectively located in the two first sensing regions (11, 21) and the two second sensing regions (12, 22). The angle measurement method comprises: outputting a first driving signal to one of the first sensing regions (11, 21), grounding the other first sensing region (11, 21), and acquiring first sensing capacitance values of at least some of the electrodes in the first sensing regions (11, 21); outputting a second driving signal to one of the second sensing regions (12, 22), outputting a third driving signal to the other second sensing region (12, 22), and acquiring second sensing capacitance values of at least some of the electrodes in one of the second sensing regions (12, 22); and on the basis of the first sensing capacitance values and the second sensing capacitance values, determining an included angle between the first display section (10) and the second display section (20). The present method solves the problem of one capacitance value corresponding to a plurality of angle values. Further provided are a control chip (60) and a display device (1).

Description

Angle detection method, control chip and display device Technical Field

[0001] The present application relates to the field of display technology, and in particular to an angle detection method, a control chip, and a display device applied to a foldable display device. Background Art

[0002] The current mainstream method for display devices to detect the open and closed status is magnetic induction, that is, using magnets and Hall elements for detection. When the display device is close to the closed state, the Hall element and the magnet will produce a magnetic induction effect, which can output the detection results to the host. The host then performs corresponding processing according to the system settings. However, the angle detection method using magnetic induction is relatively expensive. Summary of the Invention

[0003] According to a first aspect of the present application, there is provided an angle detection method for a foldable display device, wherein the display device includes a first display portion and a second display portion that are symmetrical after folding. The display device is defined with two first sensing areas and two second sensing areas, wherein the two first sensing areas are located in the first display portion and the second display portion, respectively, and the two second sensing areas are located in the first display portion and the second display portion, respectively. The first sensing area is located in a center area of ​​the first display portion and the second display portion, and the second sensing area is located between a folding area of ​​the display device and the first sensing area. The display device further includes a plurality of electrodes, wherein the plurality of electrodes are located in the two first sensing areas and the two second sensing areas, respectively, and the plurality of electrodes are parallel to the folding area of ​​the display device. The angle detection method includes: outputting a first driving signal to one of the first sensing areas, grounding another first sensing area, and obtaining a first sensing capacitance value of at least a portion of the electrodes in the first sensing area; outputting a second driving signal to one of the second sensing areas, and outputting a third driving signal to another second sensing area, and obtaining a second sensing capacitance value of at least a portion of the electrodes in one of the second sensing areas; and determining an angle between the first display portion and the second display portion based on the first sensing capacitance value and the second sensing capacitance value.

[0004] A second aspect of the present application provides a control chip, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to enable the control chip to implement the steps of the above-mentioned angle detection method when executing the computer program.

[0005] According to a third aspect of the present application, a display device is provided. The display device is foldable and includes a first display portion and a second display portion that are symmetrical after folding, a plurality of electrodes, and a control chip. The control chip is electrically connected to each of the electrodes. The display device is defined with two first sensing areas and two second sensing areas. The two first sensing areas are located in the first display portion and the second display portion, respectively. The two second sensing areas are located in the first display portion and the second display portion, respectively. The first sensing area is located in a center area of ​​the first display portion and the second display portion, and the second sensing area is located between a folding area of ​​the display device and the first sensing area. The plurality of electrodes are located in the two first sensing areas and the two second sensing areas, respectively, and the plurality of electrodes are parallel to the folding area of ​​the display device. The control chip is configured to output a first driving signal to one of the first sensing areas to obtain a first sensing capacitance value of at least some of the electrodes in another first sensing area, output a second driving signal to one of the second sensing areas, and output a third driving signal to another second sensing area to obtain a second sensing capacitance value of at least some of the electrodes in one of the second sensing areas, and determine an angle between the first display portion and the second display portion based on the first sensing capacitance value and the second sensing capacitance value.

[0006] The above-mentioned angle detection method, control chip, storage medium and foldable display device, the first display part and the second display part in the display device are respectively defined with a first sensing area and a second sensing area, and the first sensing area is driven by the ground self-capacitance mode (only sending the first drive signal to one of the first sensing areas) to obtain a first sensing capacitance value, and the second sensing area is driven by the full-drive self-capacitance mode (sending the second drive signal and the third drive signal to the two second sensing areas respectively) to obtain a second sensing capacitance value, and the angle between the first display part and the second display part is obtained according to the first sensing capacitance value and the second sensing capacitance value, which is conducive to avoiding the defects of using the ground self-capacitance mode alone or the full-drive self-capacitance mode alone, and can improve the angle detection accuracy on the basis of reducing the amount of calculation. And it can completely replace the high-cost magnetic induction angle detection method. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG1 is a three-dimensional structural diagram of a display device according to an embodiment of the present application in a folded state.

[0008] FIG2 is a planar structural diagram of the driving electrodes, sensing electrodes, and control chip in the display device of FIG1 .

[0009] FIG3 is another structural diagram of the display device in FIG1 in a folded state.

[0010] FIG4 is a schematic diagram of an ideal folding structure of a display device when the folding angle is 0°.

[0011] FIG5 is a schematic diagram of the actual folding structure of the display device when the folding angle is 0°.

[0012] FIG6 is a graph showing how the sensing signals on the electrodes in the display device vary with the folding angle in the comparative example.

[0013] FIG. 7 is a graph showing how the differential value of the sensing signal of the display device in the comparative example changes with the folding angle.

[0014] FIG8 is a schematic flow chart of the steps of the angle detection method according to an embodiment of the present application.

[0015] FIG. 9 is a schematic diagram showing a division method of sensing areas of the display device shown in FIG. 1 .

[0016] FIG. 10 is another schematic diagram showing a method for dividing the sensing areas of the display device shown in FIG. 1 .

[0017] FIG. 11 is a schematic diagram of a driving signal output method of the display device in FIG. 1 .

[0018] FIG. 12 is a graph showing how the induced capacitance of the display device shown in FIG. 1 changes with the folding angle.

[0019] FIG13 is a graph showing how the N value, W value, and F value vary with the folding angle of the display device.

[0020] FIG14 is a schematic diagram showing a detection capacitance value generated in a self-capacitance-to-ground mode.

[0021] FIG15 is an equivalent circuit diagram of generating a detection capacitance value in the mode of FIG14 .

[0022] FIG16 is a schematic diagram of the detection capacitance value generated in the full drive self-capacitance mode.

[0023] FIG17 is an equivalent circuit diagram for generating detection capacitance values ​​in the mode of FIG16 .

[0024] Description of Main Component Symbols: Display device: 1; First display unit: 10; First display area: 101; Second display unit: 20; Second display area: 201; Third display unit: 30; Third display area: 301; First sensing areas: 11, 21, 31; Second sensing areas: 12, 22, 32; Third sensing areas: 13, 23, 33; Driving electrode: 40; Sensing electrodes: 50, X1, X2, X3...X31, X32, X33, X34; Control chip: 60; First direction: X; Second direction: Y; Touch node: M; Hollow space: S; Steps: S1, S2, S3, S4.

[0025] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0026] The present application provides a foldable display device. The display device can be a computer, mobile phone, monitor, or other foldable device with an image display function. The present application also provides an angle detection method, which is applied to the above-mentioned display device, and is used to detect the folding angle of the display device, so that the display device can activate the corresponding function according to the folding angle. For example, the screen is turned on when the detected folding angle is greater than a certain threshold, and the screen is turned off when the folding angle is less than a certain threshold. In at least one embodiment of the present application, in addition to controlling the display device to turn on or off the screen according to the detected folding angle, it is also possible to turn on or off functions such as human-computer interaction and game development according to the detected folding angle, and to implement desktop switching according to the detected folding angle.

[0027] Referring to FIG. 1 , the display device 1 of this embodiment includes a first display unit 10, a second display unit 20, and a third display unit 30. The first display unit 10 has a first display area 101, the second display unit 20 has a second display area 201, and the third display unit 30 has a third display area 301. The third display unit 30 is connected between the first display unit 10 and the second display unit 20, such that the third display area 301 is connected between the first display area 101 and the second display area 201. In this embodiment, the first display area 101, the second display area 201, and the third display area 301 each have a rectangular planar structure. When the first display area 101, the third display area 301, and the second display area 201 are joined together to form a rectangular display surface of the display device 1 in a fully unfolded state. The first display area 101, the second display area 201, and the third display area 301 are used to collectively display images. In other embodiments of the present application, the display surfaces of the first display area 101 , the second display area 201 , and the third display area 301 may also be in other shapes, such as a rectangular or circular shape.

[0028] In this embodiment, the first display unit 10, the second display unit 20, and the third display unit 30 are flexible, foldable structures. By bending the third display unit 30, the angle (hereinafter referred to as the folding angle θ) between the first display area 101 of the first display unit 10 and the second display area 201 of the second display unit 20 can be adjusted, thereby achieving folding of the display device 1. In this embodiment, the folding angle θ is variable between 0° and 180° (inclusive). When the folding angle θ is 180°, the display device 1 is in a fully unfolded state, at which point the first display area 101, the second display area 201, and the third display area 301 are in the same plane. As the degree of bending of the third display unit 30 gradually increases, the first display unit 10 and the second display unit 20 (i.e., the first display area 101 and the second display area 201) gradually approach each other, i.e., the folding angle θ gradually decreases. When the first display unit 10 and the second display unit 20 (i.e., the first display area 101 and the second display area 201) are in contact with each other, the folding angle θ is 0.

[0029] In this embodiment, the display device 1 implements touch functionality based on the principle of mutual capacitance. Referring to Figure 2 , the display device 1 includes a plurality of drive electrodes 40 and a plurality of sensing electrodes 50. Each drive electrode 40 and each sensing electrode 50 is a long, strip-shaped electrode. The drive electrodes 40 are arranged parallel to each other along a first direction X, and the sensing electrodes 50 are arranged parallel to each other along a second direction Y. The first direction X and the second direction Y are perpendicular to each other and insulated from each other. The drive electrodes 40 and the sensing electrodes 50 are stacked and interleaved to form a plurality of touch nodes M.

[0030] The display device 1 also includes a control chip 60, which is electrically connected to each drive electrode 40 and each sensing electrode 50. When the display surface is touched (e.g., by a finger or a capacitive stylus), the coupling capacitance value at each touch node M within the area where the touch occurs changes. The control chip 60 is configured to send a drive signal to each drive electrode 40, receive a sensing signal generated by each sensing electrode 50, and determine, based on the sensing signal, which touch nodes M have changed coupling capacitance values, thereby determining the location of the touch.

[0031] In this embodiment, the plurality of driving electrodes 40 and the plurality of sensing electrodes 50 are distributed in the first display area 101, the second display area 201 and the third display area 301. The sensing electrodes 50 are used to detect the folding angle θ of the display device 1.

[0032] Please refer to Figure 3. When the third display portion 30 is bent so that the first display portion 10 and the second display portion 20 form an angle (not 0° or 180°), the first display portion 10 and the second display portion 20 have a facing area, and both the first display portion 10 and the second display portion 20 have driving electrodes 40 and sensing electrodes 50. At this time, if the control chip 60 sends a driving signal to the sensing electrode 50 of one of the first display portion 10 and the second display portion 20, the sensing electrode 50 of the other is grounded. In the preferred embodiment, the driving electrode 40 is grounded. The sensing electrodes 50 between the first display portion 10 and the second display portion 20 have a facing area to form a coupling capacitor. The control chip 60 detects the change in the coupling capacitance between the first display portion 10 and the second display portion 20, so that the sensing signal from each sensing electrode 60 detected by the control chip 60 changes. The sensing signal detected by the control chip 60 is hereinafter referred to as C s express.

[0033] According to the capacitance calculation formula It can be seen that the capacitance changes with the distance d between the two conductors with opposite areas. When the display device 1 is folded, the folding angle θ changes, and the distance d between the first display part 10 and the second display part 20 changes with the folding angle θ. The induced signal C sTherefore, theoretically, by calculating the induced signal C s The difference between the first display unit 10 and the second display unit 20 can ultimately determine the value of the folding angle θ. That is, when there is no touch operation on the display device 1, the value of the folding angle θ of the display device 1 can be obtained by using the value of the coupling capacitance formed between the first display unit 10 and the second display unit 20.

[0034] However, the above method for determining the folding angle θ requires that the display device 1 be folded into the position shown in FIG. 4 when the folding angle θ is 0°. That is, when the folding angle θ is 0°, the first display area 101 of the first display portion 10 and the second display area 201 of the second display portion 20 are completely aligned. However, the third display portion 30 of the display device 1 has a certain thickness and cannot be folded into a completely aligned position like a piece of paper. As a result, the first display area 101 extending from the third display portion 30 and the second display area 201 cannot completely align with each other.

[0035] Referring to Figure 5 , in an actual product, when the display device 1 is folded to a minimum folding angle θ, the first display portion 10 and the second display portion 20 contact each other at their ends away from the third display portion 30. The bent third display portion 30 creates a teardrop-shaped hollow space S within the folded area of ​​the display device 1. In other words, at this point, the first display area 101 of the first display portion 10 and the second display area 201 of the second display portion 20 do not fully align; instead, they form a negative angle, and the folding angle θ of the display device 1 is not within a range of 0°-180°.

[0036] It can be seen from this that when the display device 1 is folded from the state shown in Figure 1 to the state shown in Figure 5, the folding angle θ gradually decreases to 0° (the folding angle θ is 0° when the first display part 10 is parallel to the second display part 20), and continues to increase in a negative direction until the first display part 10 contacts the second display part 20, at which time the folding angle is negative.

[0037] In this embodiment, the location of the third display portion 30 is defined as the center of the display device 1, and the ends of the first display portion 10 and the second display portion 20 away from the third display portion 30 are defined as the ends of the display device 1. During the folding process of the display device 1, the value of the spacing d near the ends of the display device 1 changes rapidly, while the value of the spacing d near the center changes slowly. In particular, after the folding angle θ decreases to a small angle range (e.g., within 7°), the spacing d in the center almost stops decreasing. In other words, during the folding process of the display device 1, the rate of decrease of the spacing d gradually decreases. Correspondingly, during this period, the value of the sensing signal Cs gradually increases as the spacing d decreases, but the rate of increase gradually slows. However, the spacing d at the ends maintains a relatively fast rate of decrease, and the corresponding rate of increase of the sensing signal Cs at the ends accelerates, catching up with the sensing signal Cs in the center when the folding angle θ is 0° (i.e., the first display portion 10 and the second display portion 20 are parallel but not aligned). As the display device 1 continues to be folded, the distance d at the ends continues to decrease, while the distance d in the middle hardly decreases any further, and the increasing speed of the sensing signal Cs at the ends exceeds the increasing speed of the sensing signal Cs in the middle.

[0038] FIG6 shows a curve showing the change of the sensing signal value generated by each electrode (electrode number SXi, SXi+1...SXi+6) in the display device in a pair of proportions at different folding angles. FIG7 shows a curve showing the change of the differential value of the sensing signal with the folding angle. When the folding angle is a large angle state (for example, the folding angle is greater than 7°), the differential value of the sensing signal increases steadily as the folding angle decreases. When the folding angle reaches 7°, the differential value of the sensing signal gradually decreases, and continues to increase negatively after decreasing to 0. According to the curve in FIG7 , there is a case where two different folding angles a and b correspond to the same differential value c. That is, for a certain sensing signal detected, the folding angle calculated based on the differential value of the sensing signal is not unique. This makes it difficult to accurately determine the folding angle of the display device based on the sensing signal, and thus it is difficult to accurately control the function of the display device.

[0039] An embodiment of the present application provides an angle detection method, which is applied to the control chip 60 in the display device 1. By partitioning the display device 1 into different driving modes, it is helpful to improve the above-mentioned technical problem that it is difficult to accurately determine the folding angle of the display device based on the sensing signal Cs.

[0040] Referring to FIG8 , in this embodiment, the angle detection method includes:

[0041] Step S1: outputting a first driving signal to one of the first sensing regions, grounding the other first sensing region, and obtaining first sensing capacitance values ​​of at least some electrodes in the first sensing region;

[0042] Step S2, outputting a second driving signal to one of the second sensing regions, outputting a third driving signal to another of the second sensing regions, and acquiring a second sensing capacitance value of at least part of the electrodes in one of the second sensing regions;

[0043] Step S3, outputting the second driving signal to one of the third sensing regions, outputting the third driving signal to another of the third sensing regions, and acquiring a third sensing capacitance value of at least part of the electrodes in one of the third sensing regions; and

[0044] Step S4 , determining an angle between the first display portion and the second display portion according to the first sensing capacitance value, the second sensing capacitance value, and the third sensing capacitance value.

[0045] Steps S1-S3 may be performed simultaneously or in any order.

[0046] Referring to Figures 9 and 10 , in this embodiment, the first display unit 10 and the second display unit 20 are symmetrically arranged on either side of the third display unit 30. The first display unit 10 defines a first sensing area 11, a second sensing area 12, and a third sensing area 13. The first sensing area 11 is connected between the second sensing area 12 and the third sensing area 13. The second display unit 20 also defines a first sensing area 21, a second sensing area 22, and a third sensing area 23 corresponding to the first display unit 10. The first sensing area 21 is connected between the second sensing area 22 and the third sensing area 23. The first sensing area 11 and the first sensing area 21 are symmetrically arranged on either side of the third display unit 30, the second sensing area 12 and the second sensing area 22 are symmetrically arranged on either side of the third display unit 30, and the third sensing area 13 and the third sensing area 23 are symmetrically arranged on either side of the third display unit 30. The first sensing area 11 is located in the center of the first display unit 10, the second sensing area 12 is located in the middle of the display device 1, and the third sensing area 13 is located at the end of the display device 1. The first sensing area 21 is located in the center of the second display portion 20, the second sensing area 22 is located in the middle of the display device 1, and the third sensing area 23 is located at an end of the display device 1. A plurality of driving electrodes 40 and a plurality of sensing electrodes 50 are respectively disposed in the first sensing area 21, the second sensing area 22, and the third sensing area 23.

[0047] In this embodiment, the display device 1 includes 33 sensing electrodes 50. The 33 sensing electrodes 50 of the display device 1 are sequentially represented as Y1, Y2, Y3, ..., Y31, Y32, and Y33 along the second direction Y. The sensing capacitance generated by each sensing electrode 50 is sequentially represented as C1, C2, C3, ..., C31, C32, and C33. Sensing electrodes Y1-Y3 are located in the third sensing region 13, sensing electrodes Y4-Y8 are located in the first sensing region 11, sensing electrodes Y9-Y14 are located in the second sensing region 12, sensing electrodes Y15-Y18 are located in the third display portion 30, sensing electrodes Y19-Y24 are located in the second sensing region 22, sensing electrodes Y25-Y29 are located in the first sensing region 21, and sensing electrodes Y30-Y33 are located in the third sensing region 23.

[0048] In step S1, the control chip 60 drives the electrodes within the two first sensing regions 11 and 21 in a self-capacitance-to-ground mode. Specifically, the control chip 60 outputs a first drive signal to at least a portion of the drive electrodes within one of the first sensing regions 11 and 21, causing the sensing electrodes within the other sensing region to generate a first sensed capacitance value. For example, the control chip 60 outputs the first drive signal to at least a portion of the drive electrodes within the first sensing region 11, causing the sensing electrodes within the first sensing region 21 to generate a first sensed capacitance value. The first drive signal is a voltage drive signal.

[0049] In step S2, the control chip 60 drives the two second sensing areas 12 and 22 in a full-drive self-capacitance mode. Specifically, the control chip 60 outputs a second drive signal to at least some of the drive electrodes in one of the second sensing areas 12 and 22, outputs a third drive signal to at least some of the drive electrodes in the other, and detects a second sensing capacitance value on at least some of the sensing electrodes in one of the second sensing areas 12 and 22.

[0050] For example, the control chip 60 outputs a second driving signal to at least some of the driving electrodes in the second sensing area 12 , outputs a third driving signal to at least some of the driving electrodes in the second sensing area 22 , and detects a second sensing capacitance value on at least some of the sensing electrodes in the second sensing area 12 .

[0051] The second driving signal and the third driving signal are voltage driving signals with different voltage values. The electrodes in the second sensing area 12 and the second sensing area 22 that receive the second driving signal and the third driving signal are symmetrically distributed.

[0052] In step S3, the control chip 60 drives the electrodes in the two third sensing areas 13 and 23 in a full-drive self-capacitance mode. Specifically, the control chip 60 outputs a second drive signal to at least some of the drive electrodes in one of the third sensing areas 13 and 23, outputs a third drive signal to at least some of the drive electrodes in the other, and detects a third sensing capacitance value on at least some of the sensing electrodes in one of the third sensing areas 13 and 23.

[0053] For example, the control chip 60 outputs the second driving signal to at least some of the driving electrodes in the third sensing region 13, outputs the third driving signal to at least some of the driving electrodes in the third sensing region 23, and detects the third sensing capacitance value on at least some of the sensing electrodes in the third sensing region 13. The electrodes in the third sensing region 13 and the third sensing region 23 that receive the second driving signal and the third driving signal are symmetrically distributed.

[0054] FIG11 intuitively shows the output method of the driving signal in this embodiment. The filled area in FIG11 is the area where the driving electrodes that receive the driving signals are located, and the blank area is the area where the driving electrodes that do not receive the driving signals are located.

[0055] In step S4 , the control chip 60 calculates the current folding angle θ of the display device 1 according to the first sensing capacitance value, the second sensing capacitance value, and the third sensing capacitance value.

[0056] These include:

[0057] Calculation for the first sensing area 11 / 21:

[0058] Select the first sensing capacitances C5-C7 corresponding to the sensing electrodes X5-X7 located in the center of the first sensing region 11, and calculate a first average C57: C57 = (C5+C6+C7) / 3. Select the second sensing capacitances C3 and C9 corresponding to the sensing electrodes X3 and X9 closest to the first sensing region 11 in the second sensing region 12 and the third sensing region 13, respectively, and calculate a second average C39: C39 = (C3+C9) / 2. Subtract the first average C57 from the second average C39 to obtain the value N: N = C57-C39.

[0059] In other embodiments of the present application, the first sensing capacitance values ​​C4 to C8 corresponding to all sensing electrodes X4 to X8 in the first sensing region 11 may be selected to calculate a first average value C48, where C48 = (C4+C5+C6+C7+C8) / 5. C48 is used as the N value.

[0060] Calculation for the second sensing area 12 / 22 and the third sensing area 13 / 33:

[0061] Select the second sensing capacitances C10-C13 and C20-C23 corresponding to the sensing electrodes X10-X13 located in the center of the second sensing region 12 and the sensing electrodes X20-X23 located in the center of the second sensing region 22, and calculate the differential values ​​A1, A2, A3, B1, B2, and B3, respectively. The differential calculations should be symmetrical, from the center of the display device toward the ends. A1 = C11 - C10; A2 = C12 - C11; A3 = C13 - C12; B1 = C20 - C21; B2 = C21 - C22; and B3 = C22 - C23.

[0062] The above difference values ​​are averaged to obtain the mean difference value, which is recorded as W value = (A1+A2+A3+B1+B2+B3) / 6.

[0063] In the first embodiment of the present application, a first angle value is obtained based on the aforementioned N value, and a second angle value is obtained based on the aforementioned W value. When the folding angle of the display device 1 is within a small angle range, the first angle value is used as the currently detected folding angle θ of the display device 1. When the folding angle of the display device 1 is within a large angle range, the second angle value is used as the currently detected folding angle θ of the display device 1. Specifically, the specific value ranges of "large angle" and "small angle" are tested based on different display device structural parameters and recorded in the control chip 60.

[0064] In the second embodiment of the present application, the aforementioned N and W values ​​are normalized to obtain an F value. F value = m × N value + n × W value, where weighting coefficients m and n are determined based on the structural parameters of the display device and recorded in the control chip 60. Based on the aforementioned F value, the current folding angle θ of the display device 1 can be determined.

[0065] In an alternative embodiment of the present application, the sensing area division method may not be used as shown in Figure 10. In this alternative embodiment, the display device 1 does not include the third sensing areas 13 and 23. The display device 1 only includes two first display areas 11 / 21 and two second display areas 12 / 22. The angle detection method applied to this display device 1 does not include step S3.

[0066] In this modified embodiment, step S4 selects the second sensing capacitance values ​​of one or more sensing electrodes in the second display area 12 or 22 closest to the first display area 11 or 21 to calculate the average value as the second average value. Furthermore, step S4 selects the second sensing capacitance values ​​of one or more sensing electrodes in the central area of ​​the second display area 12 or 22 to perform a differential operation to calculate the average value of the differential values.

[0067] Compared with the modified embodiment, this embodiment further includes two third sensing areas 13 / 23, so that when calculating the folding angle in step S4, the sensing capacitances on the sensing electrodes near the middle portion 12 and the sensing electrodes near the end portions can be considered simultaneously, which is beneficial to improving the detection accuracy of the folding angle θ.

[0068] Please refer to Figure 12, which shows the curves of the induced capacitance values ​​corresponding to the N value, W value, and F value as a function of the folding angle θ. As can be seen from Figure 12, when calculating the folding angle using the angle detection method of the embodiment of the present application, the situation where one capacitance value corresponds to multiple angle values ​​no longer occurs. In other words, when calculating the folding angle using the angle detection method of the embodiment of the present application, a unique folding angle can be determined based on the detected induced capacitance value.

[0069] Repeat eight groups of opening and closing detections on the display device 1 and calculate the N value, W value and F value respectively. The trend of the three changing with time (the folding angle is different at different times, so it can also be regarded as a change with the folding angle) is shown in Figure 13. The four groups of data on the left are generated in the process of the display device from unfolding -> closing to a small angle range (such as 7°, the first and second display parts are parallel) -> unfolding, and the four groups of data on the right are generated in the process of the display device from unfolding -> fully closed (the first and second display parts are in contact at the ends) -> unfolding. It can be seen from Figure 13 that the W value has good linearity within a large angle range (7°-180°), the N value has significant linearity within a small angle range (0°-7°), and the F value has good linearity within the full angle range (0°-180°). The data levels of the four groups of data on the left and right for different opening and closing processes are relatively close, which shows that the angle detection method of the embodiment of the present application has good stability and reproducibility.

[0070] In other embodiments of the present application, the display device 1 can implement touch functionality based on the self-capacitive principle. When implementing touch functionality based on the self-capacitive principle, the display device 1 includes a plurality of touch electrodes arranged in an array. Each touch electrode is electrically connected to the control chip 60. Each touch electrode receives a drive signal from the control chip 60 during a first period and a sensing signal from the control chip 60 during a second period.

[0071] When the display device 1 is folded, the touch electrodes located on the first display portion 10 and the touch electrodes located on the second display portion 20 have a facing area, thereby generating coupling capacitance. Through the aforementioned angle detection method, the folding angle θ of the display device 1 can be detected based on the coupling capacitance.

[0072] Refer to Figure 14. When driving a display device in self-capacitance mode, a drive signal is output to screen 2. Screen 3 does not receive the drive signal and is considered grounded. At this time, the measured capacitance Csxi generated on the sensing electrode equals C01 / / C02. In other words, the value of Csxi is equivalent to C01 and C02 in parallel. The equivalent circuit is shown in Figure 15. C01 is the capacitance between the sensing electrode and system ground, and C02 is the coupling capacitance between screens 2 and 3, which is related to the angle between screens 2 and 3.

[0073] Refer to Figure 16. When driving the display device in full-drive self-capacitive mode, drive signals of varying amplitudes are output to screens 2 and 3. The measured capacitance generated on the sensing electrode is Csxi = C1i / / (C02 + C1j). This means that the value of Csxi is equivalent to C02 and C1j connected in parallel, then in series with C1i. The equivalent circuit is shown in Figure 17. C1i and C1j are the capacitances between the sensing electrodes and system ground, while C02 is the coupling capacitance between screens 2 and 3, which is related to the angle between them.

[0074] According to the above, in the full-drive self-capacitance driving mode, the detection capacitance value Csxi has good anti-noise ability.

[0075] Referring again to Figure 10 , when the folding angle θ of the display device 1 is within a large range, the second sensing area 12 / 22 near the center of the display device 1 generates a stronger capacitance signal than the first sensing area 11 / 21 near the end, resulting in higher accuracy in detecting the folding angle θ. However, after the folding angle θ drops to a small range, the second sensing area 12 / 22 near the center of the display device 1 forms a teardrop-shaped hollow area, and the angle tends to stabilize. This ensures that even if the overall folding angle θ of the display device 1 continues to decrease, the capacitance generated by the second sensing area 12 / 22 will not change significantly. In contrast, the capacitance of the first sensing area 11 / 21 continues to change significantly as the folding angle θ decreases after the folding angle θ drops to a small range.

[0076] Based on the variation rules of the sensing capacitance in each sensing area, in this embodiment, the value of the folding angle θ in a large angle range is obtained based on the second sensing capacitance value generated by the second sensing area 12 / 22 with stronger noise resistance.

[0077] When the folding angle θ decreases to a small angle range, the first sensing capacitance value in the first sensing area 11 / 21 near the end of the display device 1 is used to compensate for the second sensing capacitance value generated by the second sensing area 12 / 22. Specifically, the second sensing capacitance value is used as a reference value, and the reference value is subtracted from the first sensing capacitance value. The resulting sensing capacitance value is the sensing capacitance value after eliminating temperature and noise interference. In addition, for the first sensing area 11 / 21, the first sensing capacitance value is processed using the average method instead of the differential method, which can avoid the problem of the same sensing capacitance corresponding to two folding angle values.

[0078] The angle detection method, control chip 60, storage medium and foldable display device 1 of the embodiment of the present application are respectively defined with a first sensing area 11 and a second sensing area 21 in the first display part 10 and the second display part 20 in the display device 1. The first sensing area is driven by the ground self-capacitance mode (only the first drive signal is sent to one of the first sensing areas) to obtain a first sensing capacitance value, and the second sensing area is driven by the full-drive self-capacitance mode (the second drive signal and the third drive signal are sent to the two second sensing areas respectively) to obtain a second sensing capacitance value. The angle between the first display part 10 and the second display part 20 (i.e., the folding angle θ) is obtained based on the first sensing capacitance value and the second sensing capacitance value, thereby avoiding the defects of using the ground self-capacitance mode alone or the full-drive self-capacitance mode alone, and improving the angle detection accuracy on the basis of reducing the amount of calculation. It can completely replace the high-cost magnetic induction angle detection method.

[0079] The control chip 60 of the embodiment of the present application includes an electrically connected memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, any step of any of the above-mentioned angle detection methods is implemented.

[0080] An embodiment of the present application further provides a non-volatile computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of any of the above-mentioned angle detection methods when executed by a processor.

[0081] When the above-mentioned angle detection method is implemented in the form of a product and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned implementation method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable storage medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0082] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor. The processor serves as the control center of the sample processing system / sample processing device, connecting various components of the entire sample processing system / sample processing device using various interfaces and circuits.

[0083] The memory is used to store the computer program and / or module, and the processor implements the various functions of the sample processing system / sample processing device by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory. The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, at least one application required for a function (such as a sound playback function, an image playback function, etc.). In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0084] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present application and are not intended to limit the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments are within the scope of protection claimed in the present application.

Claims

1. An angle detection method, applied to a display device, characterized in that: The display device is foldable and includes a first display portion and a second display portion that are symmetrical after being folded. The display device is defined with two first sensing areas and two second sensing areas, the two first sensing areas being located in the first display portion and the second display portion, respectively, and the two second sensing areas being located in the first display portion and the second display portion, respectively. The first sensing area is located in a center area between the first display portion and the second display portion, and the second sensing area is located between a folding area of ​​the display device and the first sensing area. The display device further includes a plurality of electrodes, the plurality of electrodes being located in the two first sensing areas and the two second sensing areas, respectively, and the plurality of electrodes being parallel to the folding area of ​​the display device. The angle detection method comprises: outputting a first driving signal to one of the first sensing regions, grounding the other first sensing region, and acquiring first sensing capacitance values ​​of at least some electrodes in the first sensing region; outputting a second driving signal to one of the second sensing regions, outputting a third driving signal to another of the second sensing regions, and acquiring a second sensing capacitance value of at least part of the electrodes in one of the second sensing regions; and An angle between the first display portion and the second display portion is determined according to the first sensing capacitance value and the second sensing capacitance value.

2. The angle detection method according to claim 1, wherein: The step of determining the angle between the first display portion and the second display portion according to the first sensing capacitance value and the second sensing capacitance value includes: An angle between the first display portion and the second display portion is determined according to a first average value of the first sensing capacitance values ​​of at least some of the electrodes and an average value of differences between the second sensing capacitance values ​​of at least some of the electrodes.

3. The angle detection method according to claim 2, wherein: The step of determining the angle between the first display portion and the second display portion based on a first average value of the first sensing capacitance values ​​of at least some of the electrodes and an average value of differences between the second sensing capacitance values ​​of at least some of the electrodes comprises: An angle between the first display portion and the second display portion is determined based on a first average value of the first sensing capacitance values ​​of at least some of the electrodes, a second average value of the second sensing capacitance values ​​of at least some of the electrodes, and an average value of differences between the second sensing capacitance values ​​of at least some of the electrodes.

4. The angle detection method according to claim 3, wherein: The step of determining the angle between the first display portion and the second display portion based on a first average value of the first sensing capacitance values ​​of at least some of the electrodes, a second average value of the second sensing capacitance values ​​of at least some of the electrodes, and an average value of differences between the second sensing capacitance values ​​of at least some of the electrodes comprises: calculating a first average value of the first sensing capacitance values ​​of at least some of the electrodes, calculating a second average value of the second sensing capacitance values ​​of at least some of the electrodes, subtracting the first average value from the second average value to obtain an N value, and obtaining a first angle value according to the N value; Calculating a differential value of the second sensing capacitance value of at least part of the electrodes, averaging the differential values ​​to obtain a W value, and obtaining a second angle value according to the W value; and The first angle value or the second angle value is used as the included angle between the first display portion and the second display portion.

5. The angle detection method according to claim 3, wherein: The step of determining the angle between the first display portion and the second display portion based on a first average value of the first sensing capacitance values ​​of at least some of the electrodes, a second average value of the second sensing capacitance values ​​of at least some of the electrodes, and an average value of differences between the second sensing capacitance values ​​of at least some of the electrodes comprises: calculating a first average value of the first sensing capacitance values ​​of at least some of the electrodes, calculating a second average value of the second sensing capacitance values ​​of at least some of the electrodes, subtracting the first average value from the second average value to obtain an N value, and obtaining a first angle value according to the N value; Calculating a differential value of the second sensing capacitance value of at least part of the electrodes, averaging the differential values ​​to obtain a W value, and obtaining a second angle value according to the W value; and The N value and the W value are normalized to obtain a detection capacitance value, and the angle between the first display portion and the second display portion is obtained according to the detection capacitance value.

6. The angle detection method according to any one of claims 3 to 5, characterized in that: The second mean value is the second sensing capacitance value of at least one electrode in the second sensing region closest to the first sensing region, or the second mean value is the average value of the second sensing capacitance values ​​of several electrodes in the second sensing region close to the first sensing region.

7. The angle detection method according to claim 1, wherein: The display device further includes two third sensing areas respectively located in the first display portion and the second display portion, and each first sensing area is connected between a second sensing area and a third sensing area; The angle detection method further includes, before the step of determining the angle between the first display portion and the second display portion according to the first sensing capacitance value and the second sensing capacitance value: outputting the second driving signal to one of the third sensing regions, outputting the third driving signal to another of the third sensing regions, and acquiring a third sensing capacitance value of at least part of the electrodes in one of the third sensing regions; The step of determining the angle between the first display portion and the second display portion according to the first sensing capacitance value and the second sensing capacitance value includes: An angle between the first display portion and the second display portion is determined according to the first sensing capacitance value, the second sensing capacitance value, and the third sensing capacitance value.

8. The angle detection method according to claim 7, wherein: The step of determining the angle between the first display portion and the second display portion according to the first sensing capacitance value, the second sensing capacitance value, and the third sensing capacitance value includes: An angle between the first display portion and the second display portion is determined based on a first average of the first sensing capacitance values ​​of at least some of the electrodes, a second average of the second sensing capacitance values ​​and the third sensing capacitance values ​​of at least some of the electrodes, and an average of differences between the second sensing capacitance values ​​of at least some of the electrodes.

9. The angle detection method according to claim 8, wherein: The second average value is an average value of a second sensing capacitance value on at least one electrode in one of the second sensing regions closest to the first sensing region and a third sensing capacitance value on at least one electrode in one of the third sensing regions closest to the first sensing region.

10. The angle detection method according to claim 7, wherein: The electrodes receiving the second driving signal in the two second sensing areas are symmetrically distributed; the electrodes receiving the third driving signal in the two third sensing areas are symmetrically distributed.

11. The angle detection method according to any one of claims 2-5 and 7-10, characterized in that: The first average value is an average value of first sensing capacitance values ​​of at least part of electrodes in a central area of ​​the first sensing area.

12. The angle detection method according to any one of claims 2 or 7, characterized in that: The direction of the difference calculation is from the folding area of ​​the display area to the end.

13. A control chip, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to enable the control chip to implement the steps of the angle detection method according to any one of claims 1 to 12 when executing the computer program.

14. A display device, characterized in that: The display device is foldable and includes a first display portion and a second display portion that are symmetrical when folded, a plurality of electrodes, and a control chip, the control chip being electrically connected to each of the electrodes. The display device is defined with two first sensing areas and two second sensing areas, the two first sensing areas being located in the first display portion and the second display portion, respectively, the two second sensing areas being located in the first display portion and the second display portion, respectively, the first sensing area being located in a center area between the first display portion and the second display portion, the second sensing area being located between a folding area of ​​the display device and the first sensing area, the plurality of electrodes being located in the two first sensing areas and the two second sensing areas, and the plurality of electrodes being parallel to the folding area of ​​the display device; The control chip is configured to output a first drive signal to one of the first sensing areas to obtain a first sensing capacitance value of at least a portion of electrodes in another first sensing area, output a second drive signal to one of the second sensing areas, output a third drive signal to another second sensing area to obtain a second sensing capacitance value of at least a portion of electrodes in one of the second sensing areas, and determine an angle between the first display portion and the second display portion based on the first sensing capacitance value and the second sensing capacitance value.

15. The display device according to claim 14, wherein The invention also includes a third display portion connected between the first display portion and the second display portion, wherein the angle between the first display portion and the second display portion can be changed by folding the third display portion; The first display portion and the second display portion are symmetrically arranged on both sides of the third display portion, the two first sensing areas are symmetrically arranged on both sides of the third display portion, and the two second sensing areas are symmetrically arranged on both sides of the third display portion. The two second sensing areas are closer to the third display portion than the two first display areas.

16. The display device according to claim 14, wherein The step of determining the angle between the first display portion and the second display portion according to the first sensing capacitance value and the second sensing capacitance value includes: An angle between the first display portion and the second display portion is determined according to a first average value of the first sensing capacitance values ​​of at least some of the electrodes and an average value of differences between the second sensing capacitance values ​​of at least some of the electrodes.

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