A hand gesture recognition method based on a projected capacitive touch screen

Abstract

The present invention discloses a method for recognizing hand movements based on a projective capacitive touch screen, belonging to the field of hand movement recognition of projective capacitive touch screens. A method for recognizing hand movements based on a projective capacitive touch screen forms a three-dimensional coordinate magnetic field by superimposing existing X-pole electrode plates and Y-pole electrode plates, and captures position information by changing the magnetic field with a finger. In addition, a conductive film is superimposed on the X-pole electrode plates and Y-pole electrode plates, and a current path is formed by the conductive contacts on the conductive film coming into contact with the finger, so as to perform directional ionization on the ions in water, enabling the ions in water to move at the finger contact point, avoiding the inability to capture finger information when there is water on the screen, and since the ions in water move directionally after ionization, they can directly move at the finger contact part, avoiding inaccurate position induction of the conductive contacts on the conductive film due to the random movement of the ions in water.

Description

Technical Field

[0001] The present invention relates to the field of hand gesture recognition for projected capacitive touch screens, and more specifically, to a hand gesture recognition method based on a projected capacitive touch screen. Background Art

[0002] A projected capacitive touch screen, also known as a projected capacitive panel, is a screen that uses projected capacitive touch technology. The touch screen panel can detect changes in position capacitance when touched by a finger, thereby calculating the location of the finger and enabling multi-touch operations. Common applications of projected capacitive screens in daily life include mobile phones, MP4 players, digital cameras, etc.

[0003] The basic principle of a projected capacitive touch screen is that an X-pole electrode plate and a Y-pole electrode plate are superimposed and energized to form countless intersection magnetic fields. When a finger passes through the intersection magnetic field, it interferes with the intersection magnetic field, thereby changing the potential changes on the X-pole electrode plate and the Y-pole electrode plate at the intersection, and thus obtaining position information. However, during the actual use by the inventor, it was found that when there are water droplets on the screen, the screen sometimes cannot capture the touch point position of the finger accurately or the captured position is inaccurate. Therefore, we propose a hand gesture recognition method based on a projected capacitive touch screen to solve the above problems. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a hand gesture recognition method based on a projected capacitive touch screen. It forms a three-dimensional coordinate magnetic field by superimposing the existing X-pole electrode plate and Y-pole electrode plate, and captures position information by the finger changing the magnetic field. In addition, a conductive film is superimposed on the X-pole electrode plate and the Y-pole electrode plate. The conductive contacts on the conductive film are in contact with the finger to form a current path, which directionally ionizes the ions in the water, so that the ions in the water move at the finger contact point, avoiding the inability to capture finger information when there is water on the screen. And because the ions in the water move directionally after ionization, they can directly move at the finger contact part, avoiding inaccurate induction of the position of the conductive contacts on the conductive film due to the random movement of the ions in the water.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A hand gesture recognition method based on a projected capacitive touch screen includes the following steps:

[0007] Step 1: Generation of an induced magnetic field. The control chip supplies power to the X-pole electrode plate and the Y-pole electrode plate respectively, so that a three-dimensional coordinate magnetic field is formed after the X-pole electrode plate and the Y-pole electrode plate are superimposed.

[0008] Step 2: Perception of coordinate positions. By sliding a finger on the touch panel formed by the superposition of the X - pole electrode plate and the Y - pole electrode plate, the magnetic field at the position corresponding to the finger's sliding is transmitted towards the finger. At this time, a magnetic field difference appears at this position, and the electric field difference at the coordinate position of this position is changed.

[0009] Step 3: Capture of the initial coordinate positions. Through the electric field difference at the coordinates in Step 2, it can be transmitted to the control chip that supplies power to the X - pole electrode plate and the Y - pole electrode plate. Then, the control chip calculates and captures the position information of the finger.

[0010] Step 4: Ionization of surface medium ions. When the finger slides on the touch panel in Step 2, it can contact the conductive contacts at different positions on the conductive film. Then, the conductive contacts at the corresponding positions contact the finger to form a conductive path. The control chip supplies power to the conductive film again, causing the ions in the surface medium to ionize.

[0011] Step 5: Directional movement of surface medium ions. Since the ions in the surface medium are separated by ionization in Step 4, and the conductive contacts on the conductive film can form a path with the finger, the ions in the surface medium move along the current path formed between the conductive contacts and the finger, realizing the directional movement of the ions in the surface medium.

[0012] Step 6: Capture of the position of the directional movement of ions on the conductive film. Through the position where the ionized ions in the surface medium move directionally at the finger - contact part, the control chip can sense the current difference at this position on the conductive film, and then the control chip captures the secondary coordinate positions.

[0013] Step 7: Comparison of coordinate positions. The control chip compares the initial coordinate positions in Step 3 with the secondary coordinate positions in Step 6 to reduce the interference of the presence of the surface medium on the accuracy of the finger - touch position.

[0014] Furthermore, in addition to being composed of the superposition of the X - pole electrode plate and the Y - pole electrode plate, a conductive film is also superimposed on the surface of the touch panel in Step 1, and the X - pole electrode plate, the Y - pole electrode plate, and the conductive film are insulated from each other by an insulating film.

[0015] Furthermore, the conductive film is integrally formed by casting a metal conductive mesh and a resin layer, and the conductive contacts are arranged at the intersections of the metal wires of the metal conductive mesh, which is convenient for contacting the finger to form a current path.

[0016] Furthermore, the surface medium in Step 4 is water droplets attached to the touch panel, and the ions after the ionization of the water droplets move between the formation of the conductive path by the contact of the conductive contacts and the finger.

[0017] Further, the capture of the secondary coordinate position in step six and the capture of the primary coordinate position in step three are carried out separately to avoid affecting the accuracy of coordinate position recognition when carried out simultaneously.

[0018] Further, in step seven, the primary coordinate position and the secondary coordinate position are compared, and the coordinate position information between the primary coordinate position and the secondary coordinate position that is closer is taken.

[0019] In this solution, after the existing X - pole electrode plate and Y - pole electrode plate are stacked to form a three - dimensional coordinate magnetic field, and the magnetic field is changed by a finger to capture position information. In addition, a conductive film is further stacked on the X - pole electrode plate and the Y - pole electrode plate. The conductive contacts on the conductive film are in contact with the finger to form a current path, so as to directionally ionize the ions in water, enabling the ions in water to move at the finger contact point, and avoiding the inability to capture finger information when there is water on the screen; since the ions in water are directionally mobile after ionization, they can directly move at the finger contact part, avoiding the inaccurate induction of the positions of the conductive contacts on the conductive film due to the random movement of the ions in water, and improving the accuracy of this recognition method. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the step - by - step process of the present invention;

[0021] Figure 2 is a schematic diagram of the composition structure of the touch panel of the present invention;

[0022] Figure 3 is a schematic diagram of the magnetic field induction structure of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment:

[0025] A hand motion recognition method based on a projected capacitive touch screen includes the following steps:

[0026] Step 1: Generation of the induced magnetic field. The control chip supplies power to the X - pole electrode plate 1 and the Y - pole electrode plate 2 respectively, so that a three - dimensional coordinate magnetic field is formed after the superposition of the X - pole electrode plate 1 and the Y - pole electrode plate 2. In addition to being composed of the superposition of the X - pole electrode plate 1 and the Y - pole electrode plate 2, a conductive film 3 is also superimposed on the surface of the touch panel. The X - pole electrode plate 1, the Y - pole electrode plate 2 and the conductive film 3 are insulated from each other through an insulating film 4. The conductive film 3 is made by integrally casting a metal conductive wire grid and a resin layer, and conductive contacts 5 are arranged at the intersections of the metal wires of the metal conductive wire grid, which is convenient for contacting with the finger to form a current path;

[0027] Step 2: Sensing of the coordinate position. By sliding the finger on the touch panel formed by the superposition of the X - pole electrode plate 1 and the Y - pole electrode plate 2, the magnetic field at the position corresponding to the finger sliding is transmitted towards the finger. At this time, a magnetic field difference appears at this position, and the electric field difference at the coordinate position of this position is changed;

[0028] Step 3: Capture of the initial coordinate position. Through the electric field difference at the coordinate in Step 2, it can be transmitted to the control chip that controls the power supply of the X - pole electrode plate 1 and the Y - pole electrode plate 2. Then, the control chip calculates and captures the position information of the finger;

[0029] Step 4: Ionization of surface medium ions. When the finger slides on the touch panel in Step 2, it can contact the conductive contacts 5 at different positions on the conductive film 3. Then, the conductive contacts 5 at the corresponding positions contact with the finger to form a conductive path. The control chip supplies power to the conductive film 3 again, causing the ions in the surface medium to ionize. The surface medium is the water droplet 6 attached to the touch panel, and the ions after the ionization of the water droplet 6 move between the conductive contacts 5 and the finger to form a conductive path;

[0030] Step 5: Directional movement of surface medium ions. Since the ions in the surface medium in Step 4 are ionized and separated, and the conductive contacts 5 on the conductive film 3 can form a path with the finger, the ions in the surface medium move along the current path formed between the conductive contacts 5 and the finger, realizing the directional movement of the ions in the surface medium;

[0031] Step 6: Capture of the position of the directional movement of ions on the conductive film 3. Through the position of the ionized ions in the surface medium moving directionally at the finger - contact part, the control chip can sense the current difference at this position on the conductive film 3. Then, the control chip captures the secondary coordinate position. The capture of the secondary coordinate position and the capture of the initial coordinate position in Step 3 are carried out separately to avoid affecting the accuracy of coordinate position recognition when carried out simultaneously;

[0032] Step Seven: Comparison of coordinate positions. The control chip compares the initial coordinate position in Step Three with the secondary coordinate position in Step Six, and obtains the coordinate position information close to the initial coordinate position and between the two secondary coordinates to reduce the interference of the presence of the surface medium on the accuracy of the finger touch position.

[0033] The above is only a preferred specific embodiment of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A method for hand gesture recognition based on a projective capacitive touch screen, characterized in that: It includes the following steps: Step 1: Generation of an induced magnetic field. The control chip supplies power to the X - pole electrode plate and the Y - pole electrode plate respectively, so that a three - dimensional coordinate magnetic field is formed after the superposition of the X - pole electrode plate and the Y - pole electrode plate; In the touch panel in Step 1, in addition to being composed of the superposition of the X - pole electrode plate and the Y - pole electrode plate, a conductive film is also superimposed on the surface, and the X - pole electrode plate, the Y - pole electrode plate, and the conductive film are insulated from each other through an insulating film; The conductive film is made by integrally casting a metal conductive mesh and a resin layer, and conductive contacts are arranged at the intersections of the metal wires of the metal conductive mesh to facilitate contact with the finger to form a current path; Step 2: Perception of coordinate positions. By sliding a finger on the touch panel formed by the superposition of the X - pole electrode plate and the Y - pole electrode plate, the magnetic field at the position corresponding to the finger's sliding is transmitted to the finger. At this time, a magnetic field difference appears at this position, and the electric field difference at the coordinate position of this position is changed; Step 3: Capture of the initial coordinate position. Through the electric field difference at the coordinate in Step 2, it can be transmitted to the control chip that controls the power supply of the X - pole electrode plate and the Y - pole electrode plate. Then, the control chip calculates and captures the position information of the finger; Step 4: Ionization of surface medium ions. When the finger slides on the touch panel in Step 2, it can contact the conductive contacts at different positions on the conductive film. Then, the conductive contacts at the corresponding positions contact the finger to form a conductive path. The control chip supplies power to the conductive film again to ionize the ions in the surface medium; In Step 4, the surface medium is water droplets attached to the touch panel, and the ions after the ionization of the water droplets move between the conductive contacts and the finger to form a conductive path; Step 5: Directional movement of surface medium ions. Since the ions in the surface medium in Step 4 are separated by ionization, and the conductive contacts on the conductive film can form a path with the finger, the ions in the surface medium move along the current path formed between the conductive contacts and the finger to achieve the directional movement of the ions in the surface medium; Step 6: Capture of the position of the directional movement of ions on the conductive film. Through the position of the directional movement of the ionized ions in the surface medium at the finger - contact part, the control chip can sense the current difference at this position on the conductive film, and then the control chip captures the secondary coordinate position; The capture of the secondary coordinate position in Step 6 and the capture of the initial coordinate position in Step 3 are carried out separately to avoid affecting the accuracy of coordinate position recognition when carried out simultaneously; Step 7: Comparison of coordinate positions. The control chip compares the initial coordinate position in Step 3 with the secondary coordinate position in Step 6 to reduce the interference of the presence of the surface medium on the accuracy of the finger - touch position; In Step 7, the initial coordinate position and the secondary coordinate position are compared, and the coordinate position information close to the middle between the initial coordinate position and the secondary coordinate is taken.

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