KR20080052216A - Tactile and visual display device - Google Patents

Abstract

A tactile and visual display device is provided to enable a user to sense tactile sense information as well as to transfer visual information easily by installing a tactile sense inducing unit on an upper part of a conventional flat type display unit. A tactile and visual display device includes a display unit(100), a tactile sense inducing unit(200) and a sensing unit(300). The display unit includes plural projection lines, plural data lines and plural pixels. The tactile sense inducing unit, installed at an upper part of the display unit, permeates light emitted by the pixels, and induces a static electric force or a static magnetic force by including plural corresponding pixels(201) formed at positions matched with the pixels and transistors electrically connecting adjacent corresponding pixels to one another. The sensing unit senses the static electric force or the static magnetic force induced by the tactile sense inducing unit by being in contact with the corresponding pixels.

Description

Tactile and Visual Display Device

1 is a schematic perspective view of a tactile display device according to the present invention.

FIG. 2A is a schematic internal configuration diagram of a tactile induction unit constituting the tactile display device according to the present invention, and FIG. 2B is a circuit configuration diagram of a corresponding pixel disclosed in FIG. 2A.

3 is a diagram illustrating an embodiment of a detector according to the present invention.

4 is another embodiment of the sensing unit according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: display unit 200: touch induction unit

201: corresponding pixel 211: transparent electrode

214, 215, 216: transistor 217: capacitor

220: transistor 302: detector

310: pad portion 311: detection pixel

312: connecting insulated wire 320: pad connection

The present invention relates to an active-driven tactile display device, and more particularly, to a tactile display device in which a part for inducing touch and a part for inducing vision are integrated.

The human senses consists of sight, hearing, smell, taste, and tactile sense, but the current display device is a device that transmits virtual information by digitally converting the sound and image of a phenomenon or object, and focuses almost on transmitting visual information. Doing. Recently, the necessity of transmitting and exchanging information on the senses other than the five senses of humans has been raised. In particular, with the development of information and communication, Internet shopping malls and TV shopping malls are being activated, and the market size is increasing day by day. If the internet shopping mall provides not only visual information of the product but also tactile information such as roughness and friction, the market size and commerciality will increase.

Nevertheless, among the five senses of humans, information on tactile information or a method of quantifying it is the most backward. Currently, various methods for exchanging information between the information medium and human beings using the five senses of human beings are being studied. However, the tactile sense is sensitive to force, vibration, and temperature, and thus technology and integration are not easy.

Conventionally, a mechanical stimulator array has been used as a method of realizing the surface texture of an object. In the case of the use of mechanical stimulants, direct current (DC) motors, piezoelectric elements, shape memory alloy actuators, and ultrasonic vibration devices to stimulate the mechanoreceptors of mechanical stimuli in the skin. ultrasonic vibrator, air jet injection, pneumatic actuator, Peltier device, surface acoustic wave device, device using radial radiation pressure, A pressure valve element, an ionic conducting polymer gel film, and the like were used.

In addition, studies using electromagnetic force, in addition to the use of mechanical stimulants, have been conducted in the past. Instead of applying mechanical pressure directly, an electrostatic force (“A microfabricaed electrostatic haptic display for persons with visual impairments” H. Tang, DJ Beebe, IEEE Transactions on rehabilitation engineering, Vol. 6 (3) (1998), pp 241-248) or by using an electromagnetic micro-coil (“VITAL: A new low-cost VIbro-TActiLe display system”). MB Khoudja, M. Hafez, J.-M. Alexandre, A. Kheddar, V. Moreau, Proceeding of the 2004 International Conference on Robotics & Automation (2004), pp 721-726), electrostimulation (“ SmartTouch: skin to touch the untouchable ”H. Kajimoto, N. Kawakami, S. Tachi, IEEE Computer Graphics and Application, Vol. 24 January / Fabuary (2004), pp 36-43), DC current (“ Pattern identification on a fingertip-scanned electrotactiel dis play ”from KA Kaczmarek, ME Tayler, P. Bach-y-Rita, Proc. of the 11th Symposium on Haptic Interfaces for Visual Environment and Teleoperator Systems, Haptic Symposium 2003 (2003), pp 40-46), Friction was induced to induce skin irritation. Among these, the idea of making artificial texture by using electrostatic force to feel the texture is simple structure that can induce the touch and there is no direct influence on the human body like electric current, so Mallinckrodt et al. (“Perception by the skin of electrically induced vibration ”E. Mallinckrodt, AL Hughes, JW Sleator, Science, Vol. 118 (1953), pp 277-278) and Strong et al. (“ An electrotactile display ”RM Strong, DE Troxel, IEEE Trans.Man- Machine Systems, Vol. 11 (1) (1970), pp 72-79).

In the above-mentioned document, Tang et al. Fabricated an electrostatic tactile display in the form of a 7 X 7 electrode array using photolithography on a 4 inch Si wafer to implement a braille display for applying voltage and measuring tactile touch in a simple form. However, the above configuration has a disadvantage in that the wiring for each electrode is not easy and the resolution is limited so that it is not sufficient to express the texture of the material. In addition, there is a disadvantage that it is not easy to express various kinds of information felt by a single physical quantity by using the above-described structures.

The present invention has been devised to solve the above-mentioned problems, and an object of the present invention is to manufacture a display device capable of sensing a touch in an active driving form, and to tactilely display information about a visual signal and texture representing a display image. It is to provide a tactile display device that implements a tactile signal.

In addition, an object of the present invention is to provide a tactile display device that is equipped with a tactile induction portion formed by using a transparent electrode on the top of the existing flat panel display, to easily convey visual information as well as to sense tactile information. will be.

According to an aspect of the present invention for achieving the above object, the present invention includes a display unit including a plurality of scanning lines, a plurality of data lines and a plurality of pixels; A transistor mounted on an upper portion of the display unit to transmit light emitted from the pixel, and including a plurality of corresponding pixels formed at positions corresponding to the pixels, and a transistor electrically connecting the adjacent corresponding pixels to each other to cause an electrostatic force or a static magnetic force; Tactile induction; And a sensing unit which contacts the corresponding pixel and senses electrostatic force or sperm magnetic force induced by the tactile induction unit.

Preferably, the corresponding pixel of the tactile induction part includes a transparent electrode for transmitting light emitted from the display part, a plurality of address lines and scan lines electrically connected to the transparent electrode, and a scan signal applied to the scan line. A plurality of transistors for transmitting a signal applied to the address line, and a capacitor for storing a voltage corresponding to the transmitted signal.

Preferably, the sensing part includes a pad part including a sensing pixel corresponding to the corresponding pixel, and one end part is connected to the pad part, and the other end part includes a pad connection part electrically connected to the tactile induction part.

The sensing pixel uses one of a metallic material and a conductive material having transparency to sense an electrostatic force. The sensing pixel uses one of gold, aluminum, iron, silver, platinum, ITO and IZO. The sensing pixel uses a permanent magnet to sense static magnetic force. The sensing pixel uses a metallic permanent magnet to sense electric and magnetic forces. The pad part uses a material having elasticity and ductility. Such elastic and ductile materials include rubber, polymers, paper, natural fibers and synthetic fibers. The tactile display device exhibits elasticity and viscosity by inducing a magnetic field by driving the transistors connecting the corresponding pixels to form a rotational current.

Hereinafter, with reference to the accompanying drawings, the configuration of the present invention will be described in detail.

1 is a schematic diagram illustrating a tactile display device according to the present invention, and FIG. 2A is a schematic internal configuration diagram of a tactile induction part forming the tactile display device according to the present invention, and FIG. 2B is a view of the corresponding pixel of FIG. 2A. It is a circuit block diagram.

1, 2A and 2B, the tactile display device 1 according to the present invention is installed on the display unit 100, the display unit 100 formed on the substrate in the display unit 100 According to the provided signal includes a tactile trigger 200 for inducing electrostatic force or static magnetic force, and a sensing unit 300 to sense the tactile information or electrostatic force provided by the tactile trigger 200 to feel the touch information. In other words, the tactile induction part 200 is mounted on the upper part of the display part 100 to transmit light emitted from the display to provide visual information to the user and at the same time detect the electrostatic and static magnetic force on the surface. This is the part that makes the user feel the tactile information. The sensing unit 300 is a part mounted on the user's finger to convert the tactile information generated by the tactile induction unit 200 into a physical displacement to print using the human sense of touch.

Each component will be explained in more detail as follows. First, the display unit 100 includes a plurality of scan lines 101, a plurality of data lines 102, and a plurality of pixels 103. The tactile trigger 200 includes a plurality of field effect transistors 220 and Tr ₁ to electrically connect the plurality of corresponding pixels 201 formed at positions corresponding to each pixel 103 and the adjacent corresponding pixels 201. Tr ₂₀ ) (see FIG. 2A). The tactile induction unit 200 connects the corresponding pixel 201 to the field effect transistor 220, and generates an electric field and a magnetic field by applying a gate voltage to a field effect transistor desired by a user so as to flow a current having a desired shape. . The field effect transistor 220 is a component formed separately from the transistor constituting the corresponding pixel 201. Each corresponding pixel 201 of the tactile induction unit 200 is preferably configured to have the same size as that of the pixel 103 of the display unit 100, which means that the light generated by the display unit 100 is not scattered. It is intended to be delivered to.

Each corresponding pixel 201 of the tactile induction part 200 is connected using an active element like a driving circuit used in an active driving element LCD. Specifically, referring to FIG. 2, the corresponding pixel 201 of the tactile induction unit 200 is mounted on the display unit 100 to transmit the light emitted from the pixel 102 and the transparent electrode 211 and the transparent electrode. A plurality of address lines 212 and scan lines 213 electrically connected to 211, and transistors 214 and 215 transferring a signal applied to the address lines according to scan signals applied to the scan lines 213, and A capacitor 217 stores a voltage corresponding to the transmitted signal, and a transistor 216 supplies a current corresponding to the voltage stored in the capacitor 217 to the transparent electrode 211. When the driving circuit for driving the corresponding pixel 201 of the tactile induction unit 200 is configured as described above, electric charge can be supplied to each corresponding pixel 201 by an active driving circuit included in each corresponding pixel 201. The force may be generated by the potential difference with the sensing unit 300.

3 is an enlarged view of the pad unit 310 according to an embodiment of the sensing unit according to the present invention, and FIG. 4 is another exemplary view of the sensing unit according to the present invention.

3 and 4, the sensing unit 300 includes a pad unit 310 including a plurality of sensing pixels 311 corresponding to the corresponding pixels 201 of the tactile induction unit 200, and one end of the sensing unit 300. The other end of the part 310 includes a pad connection part 320 electrically connected to the tactile induction part 200. Referring to FIG. 3, the pad part 310 includes an insulating connection line 312 interconnecting the plurality of sensing pixels 311 and adjacent sensing pixels 311. The insulated connecting line 312 is a component that prevents current from flowing and connects each sensing pixel 311. The insulating connecting line 312 includes cotton, silk, rubber, synthetic fiber, and the like. do. In particular, the insulated connecting line 312 is intended to keep each sensing pixel 311 freely moving so that its relative position does not deviate significantly (within 2 mm-the human sensing ability is about 1 mm).

The sensing pixel 311 of the pad 310 is made of a conductive material for sensing an electric force or a magnetic material (including a permanent magnet) for sensing a magnetic force. Connecting the sensing pixels 311 with the insulated connection line 312 is for isolation of the sensing pixels 311 adjacent to each other. Meanwhile, referring to FIG. 4, the plurality of sensing pixels 311 disclosed in FIG. 4 are provided on the insulating portion 313 that is mutually flexible and insulated. The insulating part 313 may include rubber, polymer, paper, natural and synthetic fibers, and for example, a plurality of sensing pixels 311 may be attached to latex rubber. Since the sensing pixel 311 moves independently of the electric force or magnetic force of the lower part, the sensing pixel 311 may provide a more precise sense to the user. The sensing pixel 311 may use a metal including gold, aluminum, iron, silver, platinum, and the like, and a transparent electrode material including ITO, IZO, or the like to provide electrostatic force, or a permanent magnet to provide magnetic force. In addition, the sensing pixel 311 may use a metallic permanent magnet to provide both electric and magnetic forces, or may stack a double layer of a material for providing an electrostatic force and a material for providing a magnetic force.

An active driving type of the tactile display device having the above-described configuration will now be described. The process of inducing texture and measuring the touch using the above configuration can be divided into three types. First, a potential difference is generated by applying a voltage across the capacitor 217 using the transistors 214, 215, and 216. A writing process, a second process of maintaining a stored state of the capacitor 215 until the next writing process, and a third process of approaching the sensing unit 300 on the transparent electrode 211. It includes a process of detecting electrostatic forces between both electrodes.

First of all, the scan pulse voltage V₃Is applied to the transistors 215 and 216 by V to make the on state, and at the same time, the primary address voltage V_OneAnd secondary address voltage V₂Is applied to transistors 215 and 216, respectively, and | V across both capacitors 217._One -V₂Potential difference of | occurs. The potential difference generated in the capacitor 217 may be used as a driving voltage for operating the tactile trigger 200. After the write process as described above, the scan pulse voltage V₃Is a ground state with a potential difference of zero, and the transistors 215 and 216 are turned off.

Inverse scan pulse voltage V ₄ denotes the reverse signal of the scan pulse voltage V _3, that is, V ₃ that in case that the enough voltage V is V ₄ are grounded, when the V ₃ of the ground state V ₄ The voltage is applied by V.

Then, in the writing process, the transistors 215 and 216 are turned on while the transistor 214 is turned off and in the sustaining process, the transistors 215 and 216 are turned off. ) Is turned off, and the transistor 214 is turned on. In this process, since the transistor 214 is turned on and V ₃ is grounded, if the sensing unit 300 approaches the transparent electrode 211, the capacitor 217, the transparent electrode 211, And a closed circuit is formed between the sensing unit 300 to cause an electrostatic force between the transparent electrode 211 and the sensing unit 300. This is a process of inducing electrostatic force between both electrodes, and the potential difference between the transparent electrode 211 and the sensing unit 300 is the potential difference | V ₁ generated in the capacitor 217. -V ₂ | In addition, when the sensing unit 300 moves in the tactile induction unit 200, shear force generated by multiplying the electrostatic force and the surface friction coefficient is generated, and the magnitude and polarity of the voltage is changed for each corresponding pixel 201 over time. By adjusting, different shear forces can be varied and textured.

Referring to FIG. 2, in the tactile induction unit 200 of the tactile display device having the above-described configuration, a magnetic force may be induced by inducing a coil-type current, and the force may be generated using magnetization in the detection unit 300. Can be generated. For example, the field effect transistors 5, 7, 8, 9, 11, 12, 13, 14, 16, 18, 21, 22, 23, which connect adjacent pixels 201 of the tactile trigger 200. When a voltage is applied to the gate electrode of 24, a transistor corresponding to each number is turned on to form a current that rotates twice. Referring to FIG. 2A, a transistor in which a voltage is applied becomes a conductor through which current flows, and an transistor in which no voltage is applied becomes an insulator in which current does not flow, and the current flows by rotating twice when viewed based on the middle of the figure. As a result, it can be seen that the current flows in a vortex form from (+) to (-). The driving method of the tactile display device as described above may generate a coil-type current capable of adjusting the rotation speed.

The tactile induction part 200 may use an electric field and a magnetic field simultaneously by making a part inducing an electric field and a part inducing a magnetic field in a two-layer structure. When the sensing pixel 311 of the pad part 310 is made of a conductive material to detect an electric force, a portion of the tactile induction part 200 that generates an electric field may provide height information. The sensor 300 maintains a '+' voltage, and a '+' voltage is applied to the projected portion of the image displayed on the tactile trigger 200 to display the projected portion and the portion of the image displayed on the display 100. When a negative voltage is applied to a portion of the image, the sensing unit 300 receives a force toward the outside of the display at the protruding portion of the image, and a portion of the image receives a force inside the display. Feel the irregularities by touch.

When the sensing pixel 311 of the pad part 310 is made of a magnetic material to detect a magnetic force, the tactile induction part 200 may also use a magnetic field. The tactile induction unit 200 may simultaneously use a static magnetic field and an induction magnetic field among the magnetic fields generated in the circuit. In the case of the static magnetic field, the height may be expressed like the electrostatic field, but in the case of the induction magnetic field, friction or elasticity may be felt. , Viscosity, etc. can be expressed. That is, the tactile induction unit 200 may express the background curvature by the magnetic field, and wide the expression by expressing the small curvature by the electric field.

In the case where the magnetic field is formed by the current flowing through the tactile induction part 200, when the magnet is far away, the current is increased by the law of Lenz, thereby preventing the sensing part 300 from being far away. Using this phenomenon, when the sensing unit 300 made of a magnetic material is moved horizontally to the tactile induction unit 200, the movement is disturbed by an induction magnetic field. To adjust the friction. In addition, when the sensing unit 300 made of a magnetic material is moved vertically to the tactile induction unit 200, as in the case of moving horizontally, a force hinders access when approaching, and the elasticity can be adjusted from this force, You can control how far you are from, and you can express viscosity. The distance between the sensing unit 200 and the tactile induction unit 300 may be calculated by converting the capacitance between the two.

DETAILED DESCRIPTION OF THE INVENTION An exemplary embodiment of the present invention has been disclosed through the detailed description and the drawings. The terms are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Those skilled in the art will appreciate that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, by adding the tactile information in addition to the visual information of the existing display, the visual information as well as the tactile information can be provided. In addition, the present invention is to configure the circuit in the form of a coil as well as the electrostatic force on the haptic generating portion, it is possible to implement a magnetic force through a simple structure at the same time.

In addition, by forming the tactile induction portion in a two-layer structure that can provide electric and magnetic forces, it is possible to express the electrostatic force and the static magnetic force at the same time. In addition, the sensing unit connects a plurality of sensing pixels made of a metallic material with an insulating line, thereby increasing sensing efficiency and providing the user with more accurate information.

Claims (10)

A display unit including a plurality of scan lines, a plurality of data lines, and a plurality of pixels; A transistor mounted on an upper portion of the display unit to transmit light emitted from the pixel, and including a plurality of corresponding pixels formed at positions corresponding to the pixels, and a transistor electrically connecting the adjacent corresponding pixels to each other to cause an electrostatic force or a static magnetic force; Tactile induction; And A sensing unit which contacts the corresponding pixel to sense electrostatic force or sperm magnetic force induced by the tactile induction unit Tactile display device comprising a. The method of claim 1, The corresponding pixel of the tactile induction part includes a transparent electrode for transmitting light emitted from the display part, a plurality of address lines and scan lines electrically connected to the transparent electrode, and the address line according to a scan signal applied to the scan line. And a capacitor configured to store a voltage corresponding to the transmitted signal and a plurality of transistors for transmitting a signal applied to the signal. The method of claim 1, The sensing unit includes a pad unit including a sensing pixel corresponding to the corresponding pixel, and one end is connected to the pad part and the other end is a pad connection part electrically connected to the tactile induction part. The method of claim 3, And the sensing pixel uses one of a metallic material and a transparent conductive material to sense an electrostatic force. The method of claim 4, wherein And the sensing pixel uses one of gold, aluminum, iron, silver, platinum, ITO, and IZO. The method of claim 3, And the sensing pixel uses a permanent magnet to sense static magnetic force. The method of claim 3, And the sensing pixel uses a metallic permanent magnet to sense electric and magnetic forces. The method of claim 3, And a pad part using a material having elasticity and ductility. The method of claim 8, And said elastic and ductile material comprises rubber, polymer, paper, natural fibers and synthetic fibers. The method of claim 1, And a tactile display device that exhibits elasticity and viscosity by inducing a magnetic field by driving the transistors connecting the corresponding pixels to form a rotational current.

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