Display Devices

Abstract

A display device is disclosed, the display device comprising: a display panel; a first sound generator located on a first surface of the display panel, the first sound generator configured to vibrate the display panel to output a first sound; and a second sound generator configured to output a second sound. A third sound is a sum of the first sound and the second sound, and a sound pressure level of at least one of the harmonic tones of the third sound is less than a sound pressure level of at least one of the harmonic tones of the first sound.

Description

Technical Field

[0001] Exemplary embodiments / embodiments of the present invention generally relate to a display device and a sound providing method. Background Art

[0002] With the development of the information society, the demand for display devices for displaying images has increased in various forms. For example, display devices are applied to various electronic devices such as smart phones, digital cameras, notebook computers, navigators, and smart TVs. The display device may include a display panel for displaying images and a sound generator for providing sound.

[0003] The sound output by the sound generator includes a fundamental tone and a harmonic tone. The harmonic tone refers to an overtone tone having an integer multiple frequency of the fundamental tone. The harmonic tone having an even multiple frequency of the fundamental tone may have the same pitch as the fundamental tone, while the harmonic tone having an odd multiple frequency of the fundamental tone may have a different pitch from the fundamental tone. Since the harmonic tone has a different pitch from the fundamental tone, the sound quality may be degraded.

[0004] The above information disclosed in this Background section is only for understanding the background of the inventive concept and therefore, this Background section may contain information that does not constitute prior art. Summary of the invention

[0005] An aspect of an apparatus constructed according to an exemplary embodiment of the present invention relates to a display apparatus that can prevent or reduce degradation in sound quality due to a harmonic tone having a different pitch from a fundamental tone.

[0006] An aspect of a method constructed according to an exemplary embodiment of the present invention relates to a sound providing method of a display device, which can prevent or reduce degradation in sound quality due to a harmonic tone having a different pitch from a basic tone.

[0007] Additional features of the inventive concept will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the inventive concept.

[0008] According to one or more embodiments of the present invention, a display device includes: a display panel; a first sound generator located on a first surface of the display panel, the first sound generator configured to vibrate the display panel to output a first sound; and a second sound generator configured to output a second sound. A third sound is a sum of the first sound and the second sound, and a sound pressure level of at least one of the harmonic tones of the third sound is less than a sound pressure level of at least one of the harmonic tones of the first sound.

[0009] A difference between a phase of at least one of the harmonic tones of the first sound and a phase of at least one of the harmonic tones of the second sound may be less than -90° and greater than 90°.

[0010] The sound pressure level of at least one harmonic tone of the first sound may be different from the sound pressure level of at least one harmonic tone of the second sound.

[0011] The sound pressure level of the fundamental tone of the third sound may be greater than the sound pressure level of the fundamental tone of the first sound.

[0012] A difference between a phase of the fundamental pitch of the first sound and a phase of the fundamental pitch of the second sound may be in a range from -90° to 90°.

[0013] The sound pressure level of the fundamental tone of the first sound may be different from the sound pressure level of the fundamental tone of the second sound.

[0014] The sound pressure level of the first harmonic tone of the third sound may be smaller than that of the first sound, and the sound pressure level of the second harmonic tone of the third sound may be smaller than that of the first sound.

[0015] The difference between the phase of the first harmonic tone of the first sound and the phase of the first harmonic tone of the second sound can be less than -90° and greater than 90°, and the difference between the phase of the second harmonic tone of the first sound and the phase of the second harmonic tone of the second sound can be less than -90° and greater than 90°.

[0016] The sound pressure level of the first harmonic tone of the first sound may be different from the sound pressure level of the first harmonic tone of the second sound, and the sound pressure level of the second harmonic tone of the first sound may be different from the sound pressure level of the second harmonic tone of the second sound.

[0017] The sound pressure level of the first harmonic tone of the third sound may be greater than the sound pressure level of the first harmonic tone of the first sound.

[0018] A difference between a phase of the first harmonic tone of the first sound and a phase of the first harmonic tone of the second sound may be in a range from -90° to 90°.

[0019] The sound pressure level of the second harmonic tone of the third sound may be smaller than the sound pressure level of the second harmonic tone of the first sound.

[0020] A difference between a phase of the second harmonic tone of the first sound and a phase of the second harmonic tone of the second sound may be less than -90° and greater than 90°.

[0021] Each of the first sound generator and the second sound generator may be a piezoelectric element or a piezoelectric actuator including a piezoelectric material configured to contract and expand according to an applied voltage.

[0022] The second sound generator may be located on the first surface of the display panel and configured to vibrate the display panel to output the second sound.

[0023] The display device may further include a bracket located on the first surface of the display panel. The second sound generator may be located on a second surface of the bracket facing the first surface of the display panel and configured to vibrate the display panel to output the second sound.

[0024] The first sound generator may be a piezoelectric element or a piezoelectric actuator including a piezoelectric material configured to contract and expand according to an applied voltage, and the second sound generator may be a linear resonant actuator configured to vibrate the bracket by generating a magnetic force according to an applied voltage using a voice coil.

[0025] The display device may also include: a first sound driver, which can be configured to convert the first sound data into a first sound signal and output the first sound signal to the first sound generator; a second sound driver, configured to convert the second sound data into a second sound signal and output the second sound signal to the second sound generator; and a phase shifter, configured to modulate the second sound data and output the second sound data to the second sound driver to shift the phase of the fundamental tone of the second sound and the phase of at least one harmonic tone of the second sound.

[0026] The display device may further include: a main processor configured to output the first sound data to the first sound driver and output the second sound data to the phase shifter; and a main circuit board having the main processor, the second sound driver, and the phase shifter.

[0027] The display device may further include: a display circuit board located on the first surface of the display panel, and the first sound driver is located on the display circuit board.

[0028] The phase shifter and the first sound driver may be formed as one integrated circuit.

[0029] The display device may also include: a first sound driver configured to convert first sound data into a first sound signal and output the first sound signal to the first sound generator; a second sound driver configured to convert second sound data into a second sound signal and output the second sound signal to the second sound generator; and a lookup table configured to store information about the fundamental tone and at least one harmonic tone of the second sound based on the frequencies of the fundamental tone and at least one harmonic tone of the first sound.

[0030] The display device may further include: a main processor configured to output the first sound data to the first sound driver and output the second sound data to the second sound driver; and a main circuit board having the main processor, the second sound driver, and a lookup table.

[0031] According to one or more embodiments of the present invention, a sound providing method of a display device includes: shifting the phase of a basic tone of a first sound in a first sound mode to generate a basic tone of a second sound; shifting the phase of at least one harmonic tone of the first sound in the first sound mode to generate at least one harmonic tone of the second sound; outputting first sound data including information about the basic tone of the first sound and at least one harmonic tone of the first sound in the first sound mode, and outputting second sound data including information about the basic tone of the second sound and at least one harmonic tone of the second sound in the first sound mode; generating a first sound signal according to the first sound data, and outputting the first sound signal to a first sound generator; and generating a second sound signal according to the second sound data, and outputting the second sound signal to a second sound generator.

[0032] The method may also include: shifting the phase of any one harmonic tone of the second sound having the same frequency as the basic tone of the first sound in the second sound mode; and outputting second sound data including information about the basic tone of the second sound and any one phase-shifted harmonic tone of the second sound in the second sound mode.

[0033] The method may also include: shifting the phase of any one harmonic tone of the second sound having the same frequency as the basic tone of the first sound in the second sound mode; shifting the phase of another harmonic tone of the second sound having the same frequency as any one harmonic tone of the first sound in the second sound mode; and outputting second sound data including information about the basic tone of the second sound, any one phase-shifted harmonic tone of the second sound, and another harmonic tone of the second sound in the second sound mode.

[0034] The third sound may be a sum of the first sound and the second sound, and a sound pressure level of at least one of the harmonic tones of the third sound may be smaller than a sound pressure level of at least one of the harmonic tones of the first sound.

[0035] According to aspects of the foregoing and other exemplary embodiments of the present disclosure, an amplification effect of making the sound pressure level of the fundamental tone of the third sound, which is the sum of the first sound and the second sound, higher than the sound pressure level of the fundamental tone of the first sound can be obtained, and concurrently (e.g., simultaneously) a cancellation effect of making the sound pressure level of at least one of the harmonic tones of the third sound lower (or smaller) than the sound pressure level of at least one of the harmonic tones of the first sound can be obtained. Therefore, a decrease in the sound quality provided to the user due to the harmonic tones of the first sound can be prevented or reduced, and high-quality sound can be provided by increasing the sound pressure level of the fundamental tone of the first sound.

[0036] In addition, a canceling effect of lowering the sound pressure level of the harmonic tones of the first sound each having a pitch different from the basic pitch of the first sound can be obtained, and concurrently (for example, simultaneously) an amplifying effect of raising the sound pressure level of the harmonic tones of the first sound each having the same pitch as the basic pitch of the first sound can be obtained. Therefore, a decrease in the sound quality provided to the user due to the harmonic tones of the first sound each having a pitch different from the basic pitch of the first sound can be prevented or reduced, and high-quality sound can be provided by increasing the sound pressure level of the harmonic tones of the first sound each having the same pitch as the basic pitch of the first sound.

[0037] Other features and exemplary embodiments will become apparent from the following detailed description, drawings, and claims.

[0038] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the inventive concept.

[0040] Figure 1 is a perspective view of a display device according to an exemplary embodiment.

[0041] Figure 2 is an exploded perspective view of a display apparatus according to an exemplary embodiment.

[0042] Figure 3 is a diagram showing an example of an embodiment of the invention being attached to Figure 2 A bottom view of the display panel of the cover window.

[0043] Figure 4 is a diagram showing an example of an embodiment of the invention being attached to Figure 3A bottom view of a bracket on the lower surface of a display panel and a main circuit board arranged on the bracket.

[0044] Figure 5 According to an exemplary embodiment, Figure 3 A cross-sectional view taken along line II'.

[0045] Figure 6 The exemplary embodiment is specifically shown Figure 5 A cross-sectional view of a display area of ​​a display panel.

[0046] Figure 7 The exemplary embodiment is specifically shown Figure 5 A cross-sectional view of a first sound generator.

[0047] Figure 8 is a diagram showing the configuration of the Figure 7 A view of a method of vibrating a vibration layer between a first branch electrode and a second branch electrode of a first sound generator.

[0048] Fig. 9 The exemplary embodiment is specifically shown Figure 5 A stereoscopic view of a second sound generator.

[0049] Fig.10 is a flowchart illustrating a sound providing method of a display apparatus according to an exemplary embodiment.

[0050] Figures 11 to 13 is a graph showing the sound pressure level of a first sound depending on a fundamental tone and harmonic tones according to an exemplary embodiment, a graph showing the sound pressure level of a second sound depending on a fundamental tone and harmonic tones according to an exemplary embodiment, and a graph showing the sound pressure level of a third sound depending on a fundamental tone and harmonic tones according to an exemplary embodiment, wherein the third sound is the sum of the first sound and the second sound.

[0051] Fig.14 is a waveform diagram showing that the amplitude of the fundamental pitch of the first sound and the amplitude of the fundamental pitch of the second sound depend on time according to an exemplary embodiment.

[0052] Fig.15 : is a view showing the phase and amplitude of a first sound, the phase and amplitude of a second sound, and the phase and amplitude of a third sound according to an exemplary embodiment.

[0053] Fig.16 is a waveform diagram showing the amplitude of the first harmonic tone of the first sound and the amplitude of the first harmonic tone of the second sound depending on time according to an exemplary embodiment.

[0054] Fig.17: is a view showing the phase and amplitude of a first sound, the phase and amplitude of a second sound, and the phase and amplitude of a third sound according to an exemplary embodiment.

[0055] Fig.18 is a view illustrating a first frequency band of a first sound, a second frequency band of a second sound, and a third frequency band which is a frequency band overlapping the first and second frequency bands according to an exemplary embodiment.

[0056] Fig.19 is a flowchart illustrating a sound providing method of a display device according to another embodiment.

[0057] Figure 20 to Figure 22 is a graph showing a frequency-dependent sound pressure level of a first sound according to an exemplary embodiment, a frequency-dependent sound pressure level of a second sound according to an exemplary embodiment, and a frequency-dependent sound pressure level of a third sound according to an exemplary embodiment, wherein the third sound is the sum of the first sound and the second sound.

[0058] Fig.23 is a diagram showing an example of an embodiment of the invention being attached to Figure 3 A bottom view of a bracket on the lower surface of a display panel and a main circuit board arranged on the bracket.

[0059] Fig.24 is a diagram showing an example of an embodiment of the invention being attached to Figure 2 A bottom view of the display panel of the cover window.

[0060] Fig.25 is a diagram showing an example of an embodiment of the invention being attached to Figure 3 A bottom view of a bracket on the lower surface of a display panel and a main circuit board arranged on the bracket. DETAILED DESCRIPTION

[0061] In the following description, for the purpose of explanation, many specific details are set forth in order to provide a thorough understanding of various exemplary embodiments or embodiments of the present invention. As used herein, "embodiment" and "embodiment" are interchangeable words, which are non-limiting examples of one or more devices or methods using the inventive concept disclosed herein. However, it is apparent that various exemplary embodiments can be practiced without these specific details or with one or more equivalent arrangements. In other examples, known structures and devices are shown in block diagram form to avoid unnecessary confusion of various exemplary embodiments. In addition, various exemplary embodiments may be different, but need not be exclusive. For example, without departing from the inventive concept, the specific shape, configuration and characteristics of the exemplary embodiment may be used or implemented in another exemplary embodiment. In addition, the term "exemplary" is intended to represent an example or illustration.

[0062] Unless otherwise specified, the exemplary embodiments shown should be understood as providing exemplary features of varying details of some ways in which the inventive concept can be implemented in practice. Therefore, unless otherwise specified, the features, components, modules, layers, films, panels, regions and / or aspects of the various embodiments, etc. (hereinafter, individually or collectively referred to as "elements") may be combined, separated, interchanged and / or rearranged in various ways without departing from the inventive concept.

[0063] The use of cross hatching and / or shading in the drawings is generally provided to clarify the boundaries between adjacent elements. Therefore, the presence or absence of cross hatching or shading does not convey or indicate any preference or requirement for a specific material, material property, size, ratio, commonality between the elements shown and / or any other characteristics, attributes, properties, etc. of the elements, unless otherwise stated. In addition, in the drawings, the size and relative size of the elements may be exaggerated for the purpose of clarity and / or description. When the exemplary embodiments can be implemented differently, the specific process sequence can be performed differently from the described sequence. For example, two processes described in succession can be performed substantially simultaneously or in an order opposite to the described sequence. In addition, the same reference numerals represent the same elements.

[0064] When an element or layer is referred to as being "on", "connected to" or "coupled to" another element or layer, it may be directly on, directly connected to or directly coupled to the other element or layer, or there may be an intervening element or layer. However, when an element or layer is referred to as being "directly" "on", "directly connected to" or "directly coupled to" another element or layer, there is no intervening element or layer. For this reason, the term "connection" may refer to physical, electrical and / or fluid connections with or without intermediate elements. As used herein, the terms "use", "using" and "used" may be considered to be synonymous with the terms "utilize", "utilize" and "utilize" respectively. In addition, the X-axis, Y-axis and Z-axis are not limited to the three axes (such as x-axis, y-axis and z-axis) of a rectangular coordinate system, and may be interpreted in a broader sense. For example, the X-axis, Y-axis and Z-axis may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purpose of this disclosure, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" may be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z, such as, for example, XYZ, XYY, YZ, and ZZ. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0065] Although the terms "first", "second", etc. may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another element. Therefore, without departing from the teachings of the present disclosure, the first element described below may be referred to as the second element.

[0066] For descriptive purposes, spatially relative terms such as "below," "beneath," "under," "lower," "above," "upper," "above," "above," "side" (e.g., as in "sidewall"), etc. may be used herein and thereby describe the relationship of one element(s) to another element(s) as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is flipped, elements described as being "below" or "below" other elements or features will then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both above and below orientations. In addition, the device may have additional orientations (e.g., rotated 90 degrees or in other orientations), and therefore, the spatially relative descriptors used herein should be interpreted accordingly.

[0067] The terms used herein are for the purpose of describing specific embodiments, rather than being intended to be limiting. As used herein, the singular forms "one", "an" and "the" are intended to also include plural forms, unless the context clearly states otherwise. In addition, when used in this specification, the terms "comprises", "comprising", "includes" and / or "including" specify the existence of the features, integral bodies, steps, actions, operations, elements, parts and / or groups thereof described, but do not exclude the existence or addition of one or more other features, integral bodies, steps, actions, operations, elements, parts and / or groups thereof. It should also be noted that, as used herein, the terms "substantially", "about" and other similar terms are used as approximate terms rather than as degree terms, and are therefore used to explain the inherent deviations of the values ​​measured, calculated and / or provided that will be recognized by those of ordinary skill in the art.

[0068] Various exemplary embodiments are described herein with reference to cross-sectional views and / or exploded views as schematic diagrams of idealized exemplary embodiments and / or intermediate structures. As such, variations in the shapes of the diagrams resulting from, for example, manufacturing techniques and / or tolerances should be expected. Therefore, the exemplary embodiments disclosed herein should not necessarily be interpreted as being limited to the specific illustrated shapes of the regions, but rather include deviations in shapes resulting from, for example, manufacturing. In this way, the regions shown in the drawings may be schematic in nature, and the shapes of these regions may not reflect the actual shapes of the regions of the device, and therefore, are not necessarily intended to be limiting.

[0069] As is customary in the art, some exemplary embodiments are described and shown in the accompanying drawings according to functional blocks, units and / or modules. It will be understood by those skilled in the art that these blocks, units and / or modules are physically implemented by electrical circuits (or optical circuits) such as logic circuits, discrete components, microprocessors, hard-wired circuits, memory elements, wiring connectors, etc. that can be formed using semiconductor-based manufacturing techniques or other manufacturing techniques. In the case where blocks, units and / or modules are implemented by microprocessors or other similar hardware, they can be programmed and controlled by software (e.g., microcode) to perform the various functions discussed herein, and they can be selectively driven by firmware and / or software. It is also conceivable that each block, unit and / or module can be implemented by dedicated hardware, or can be implemented as a combination of dedicated hardware for performing some functions and processors (e.g., one or more programmed microprocessors and associated circuits) for performing other functions. In addition, without departing from the scope of the inventive concept, each block, unit and / or module of some exemplary embodiments can be physically separated into two or more interactive and discrete blocks, units and / or modules. Furthermore, the blocks, units and / or modules of some exemplary embodiments may be physically combined into more complex blocks, units and / or modules without departing from the scope of the inventive concept.

[0070] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present disclosure belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless explicitly defined as such in this article.

[0071] Figure 1 is a perspective view of a display device according to an exemplary embodiment, and Figure 2 is an exploded perspective view of a display apparatus according to an exemplary embodiment.

[0072] refer to Figure 1 and Figure 2 , the display device 10 according to the exemplary embodiment includes a cover window 100, a display panel 300, a display circuit board 310, a display driving circuit 320, a flexible film 390, a first sound generator 510, a second sound generator 520, a bracket 600, a main circuit board 700 and a lower cover 900.

[0073] The terms "upper", "above", "top", "upper side" or "upper surface" refer to the direction in which the cover window 100 is arranged relative to the display panel 300 (i.e., the Z-axis direction), and the terms "below", "below", "bottom" or "lower surface" refer to the direction in which the bracket 600 is arranged relative to the display panel 300 (i.e., the direction opposite to the Z-axis direction). In addition, the terms "left", "right", "upper" and "lower" refer to the directions when viewed from a plan view (e.g., in a direction parallel to the Z-axis direction). Figure 1 and Figure 2 For example, the term "left" refers to a direction opposite to the X-axis direction, the term "right" refers to the X-axis direction, the term "up" refers to the Y-axis direction, and the term "down" refers to a direction opposite to the Y-axis direction.

[0074] The display device 10 may have a rectangular shape in plan view. Figure 1 and Figure 2 As shown in , the display device 10 may have a rectangular planar shape having a short side in a first direction (X-axis direction) and a long side in a second direction (Y-axis direction). The edge where the short side in the first direction (X-axis direction) intersects the long side in the second direction (Y-axis direction) may be formed into a rounded shape having a predetermined curvature or a set curvature or having a right angle shape. The planar shape of the display device 10 is not limited to a rectangular shape, and may be formed into another polygonal shape, a circular shape, or an elliptical shape.

[0075] The display device 10 may include a first region DR1 formed to be flat and a second region DR2 extending from the right and left sides of the first region DR1. The second region DR2 may be formed to be flat or curved. When the second region DR2 is flat, an angle formed by the first region DR1 and the second region DR2 may be an obtuse angle. In other words, a boundary of the first region DR1 and the second region DR2 may form an obtuse angle. When the second region DR2 is curved, the second region DR2 may have a constant curvature or a variable curvature.

[0076] Despite Figure 1, the second region DR2 is shown to extend from the left and right sides of the first region DR1, but the present invention is not limited thereto. For example, the second region DR2 may extend from only one of the left and right sides of the first region DR1. In addition, the second region DR2 may extend from only one of the upper and lower sides of the first region DR1 and only one of the left and right sides of the first region DR1. Hereinafter, it is assumed that the second region DR2 is disposed along the left and right edges of the display device 10.

[0077] The cover window 100 may be disposed on the display panel 300 so as to cover the upper surface of the display panel 300. Therefore, the cover window 100 may play a role in protecting the upper surface of the display panel 300.

[0078] The cover window 100 may include a light-transmitting area DA100 corresponding to the display panel 300 and a light-blocking area NDA100 corresponding to an area other than the display panel 300. The cover window 100 may be disposed in the first area DR1 and the second area DR2, and the light-transmitting area DA100 may be disposed in a portion of the first area DR1 and a portion of the second area DR2. The light-blocking area NDA100 may be formed to be opaque. In some embodiments, the light-blocking area NDA100 may be formed as a decorative layer having a pattern that can be displayed to a user when an image is not displayed.

[0079] The display panel 300 may be disposed under the cover window 100. The display panel 300 may be disposed to overlap the light transmission area DA100 of the cover window 100. The display panel 300 may be disposed in the first region DR1 and the second region DR2. Therefore, an image of the display panel 300 may be viewed not only in the first region DR1 but also in the second region DR2.

[0080] The display panel 300 may be a light-emitting display panel including a light-emitting element. Examples of the display panel 300 may include an organic light-emitting display panel using an organic light-emitting diode including an organic light-emitting layer, an ultra-micro light-emitting diode display panel using an ultra-micro light-emitting diode (ultra-micro LED), a quantum dot light-emitting diode display panel using a quantum dot light-emitting diode including a quantum dot light-emitting layer, and an inorganic light-emitting display panel using an inorganic light-emitting diode including an inorganic semiconductor. Hereinafter, it is assumed that the display panel 300 is an organic light-emitting display panel.

[0081] The display circuit board 310 and the display driving circuit 320 may be attached to one side of the display panel 300. An anisotropic conductive film may be used to attach one end of the display circuit board 310 to a pad provided at (or on) one side of the display panel 300. The display circuit board 310 may be a flexible printed circuit board, a rigid printed circuit board that is not easily bent, or a composite printed circuit board including both a flexible printed circuit board and a rigid printed circuit board.

[0082] The display driver circuit 320 receives a control signal and a power supply voltage through the display circuit board 310. In some embodiments, the display driver circuit 320 generates and outputs a signal and a voltage for driving the display panel 300. The display driver circuit 320 may be formed as an integrated circuit and may be attached to the display panel 300 using a chip on glass (COG) method, a chip on plastic (COP) method, or an ultrasonic method, but the present invention is not limited thereto. For example, the display driver circuit 320 may be attached to the display circuit board 310. The touch driver circuit 330 and the first sound driver 340 may be disposed on the display circuit board 310.

[0083] The touch drive circuit 330 may be formed as an integrated circuit and may be attached to the upper surface of the display circuit board 310. The touch drive circuit 330 may be connected to the touch electrodes of the touch sensor layer of the display panel 300 through the display circuit board 310. The touch drive circuit 330 may apply a touch drive signal to a drive electrode among the touch electrodes, and may sense a charge change of a capacitance between the drive electrode and the sensing electrode through a sensing electrode among the touch electrodes, thereby outputting touch data including the touch coordinates of the user.

[0084] The first sound driver 340 receives the first sound data from the main circuit board 700. The first sound driver 340 generates a first sound signal according to the first sound data and outputs the first sound signal to the first sound generator 510. The first sound driver 340 may be formed as an integrated circuit.

[0085] A power supply unit for supplying a display driving voltage for driving the display driving circuit 320 may be provided on the display circuit board 310. When the display driving voltage and the first sound signal are generated from one circuit, they may affect each other. However, the display driving voltage for driving the display panel 300 and the first sound signal for driving the first sound generator 510 may be generated from circuits different from each other. Therefore, the display driving voltage and the first sound signal may be prevented or substantially prevented from affecting each other.

[0086] One side of the flexible film 390 may be attached to the upper surface of the display panel 300 at the lower side of the display panel 300 through an anisotropic conductive film. The other side of the flexible film 390 may be attached to the upper surface of the display circuit board 310 at the upper side of the display circuit board 310 through an anisotropic conductive film. The flexible film 390 may be a bendable film.

[0087] Meanwhile, the flexible film 390 may be omitted, and the display circuit board 310 may be directly attached to one side of the display panel 300. In this case, one side of the display circuit board 310 may be bent toward the lower surface of the display panel 300.

[0088] The first sound generator 510 may be disposed on one side of the display panel 300. Figure 5 As shown in , the first sound generator 510 may be attached to one side of the display panel 300 using a first adhesive member 610 such as a pressure sensitive adhesive. Figure 3 and Figure 5 As shown in , when the panel lower member 400 is disposed on one surface of the display panel 300, the first sound generator 510 may be attached to the panel lower member 400 by the first adhesive member 610. The first sound generator 510 may be a piezoelectric element or a piezoelectric actuator that uses a piezoelectric material that contracts and expands according to an applied voltage to vibrate the display panel 300. Although Figure 2 2 and 3. It is shown that the first sound generator 510 has a rectangular parallelepiped shape, but the shape of the first sound generator 510 is not limited thereto.

[0089] The bracket 600 may be disposed under the display panel 300. The bracket 600 may include plastic, metal, or both plastic and metal. The bracket 600 may be provided with a first camera hole CMH1 into which the camera device 720 is inserted, a battery hole BH, and a cable hole CAH through which the cable 314 connected to the display circuit board 310 passes.

[0090] The second sound generator 520 may be disposed on one surface of the bracket 600. The second sound generator 520 may be a linear resonance actuator (LRA) that vibrates the bracket 600 by generating a magnetic force based on an applied voltage using a voice coil. Figure 2 2 and 3. It is shown that the second sound generator 520 has a cylindrical shape, but the shape of the second sound generator 520 is not limited thereto.

[0091] When the first sound generator 510 is a piezoelectric element or a piezoelectric actuator and the second sound generator 520 is a linear resonant actuator (LRA), the first sound generator 510 is suitable for outputting sound of a relatively higher frequency band than the second sound generator 520, and the second sound generator 520 is suitable for outputting sound of a relatively lower frequency band than the first sound generator 510.

[0092] The main circuit board 700 and the battery 790 may be disposed under the bracket 600. The main circuit board 700 may be a printed circuit board or a flexible printed circuit board.

[0093] The main circuit board 700 may include a main processor 710, a camera device 720, a main connector 730, a memory 740, a phase shifter 750, and a second sound driver 760. Each of the main processor 710, the phase shifter 750, and the second sound driver 760 may be formed as an integrated circuit.

[0094] The camera device 720 may be provided on both the upper surface and the lower surface of the main circuit board 700. The main processor 710, the memory 740, the phase shifter 750, and the second sound driver 760 may be provided on the upper surface of the main circuit board 700, and the main connector 730 may be provided on the lower surface of the main circuit board 700. The phase shifter 750 may be provided in the first sound driver 340 instead of being provided on the upper surface of the main circuit board 700. That is, the first sound driver 340 and the phase shifter 750 may be constituted by one integrated circuit.

[0095] The main processor 710 can control all functions of the display device 10. For example, the main processor 710 can output digital video data to the display drive unit (e.g., display drive circuit 320) through the display circuit board 310, so that the display panel 300 displays an image. In addition, the main processor 710 can receive touch data from the touch drive unit (e.g., touch drive circuit 330), determine the user's touch position, and then execute the application indicated by the icon displayed at the user's touch position. In addition, the main processor 710 can receive touch data from the touch drive unit, and can execute the application indicated by the icon displayed at the user's touch coordinates according to the touch data.

[0096] The main processor 710 receives sound source data from the outside and outputs the sound source data to the memory 740. Since the memory 740 stores the sound data according to the frequency of the sound source data, the memory 740 can output the sound data by using the frequency of the sound source data as an input address.

[0097] The main processor 710 may control the display device 10 in the first sound mode and the second sound mode. In order to prevent the degradation of the sound quality due to the harmonic tone of the first sound, the main processor 710 may control the display device 10 to eliminate or partially eliminate at least one harmonic tone of the first sound output by the first sound generator 510 using at least one harmonic tone of the second sound output by the second sound generator 520, and to amplify the basic tone of the first sound using the basic tone of the second sound. The main processor 710 may generate the first sound data according to the sound data input from the memory 740 in the first sound mode. The main processor 710 may output the first sound data to the phase shifter 750 in the first sound mode.

[0098] In order to provide a sound having both a low frequency band and a high frequency band in the second sound mode, the main processor 710 may control the display device 10 so that the first sound generator 510 outputs a first sound of a high frequency band and the second sound generator 520 outputs a second sound of a low frequency band. The main processor 710 may generate the first sound data and the second sound data according to the sound data input from the memory 740 in the second sound mode. The main processor 710 may output the first sound data and the second sound data to the phase shifter 750 in the second sound mode.

[0099] The first sound data includes information about the frequency of the fundamental tone of the first sound and the frequency of the harmonic tone of the first sound, and information about the sound pressure level or amplitude of the fundamental tone of the first sound and the sound pressure level or amplitude of the harmonic tone of the first sound. The second sound data includes information about the frequency of the fundamental tone of the second sound and the frequency of the harmonic tone of the second sound, and information about the sound pressure level or amplitude of the fundamental tone of the second sound and the sound pressure level or amplitude of the harmonic tone of the second sound.

[0100] The phase shifter 750 receives the first sound data in the first sound mode. The phase shifter 750 modulates the first sound data in the first sound mode and outputs the second sound data. The phase shifter 750 may shift the phase of the fundamental tone of the first sound and the phase of the harmonic tones of the first sound to generate the fundamental tone and the harmonic tones of the second sound. The sound pressure level of the fundamental tone and the harmonic tones of the third sound which is the sum of the first sound and the second sound may be higher or lower (i.e., different) than the sound pressure level of the fundamental tone and the harmonic tones of the first sound.

[0101] The phase shifter 750 receives the first sound data and the second sound data in the second sound mode. The phase shifter 750 may modulate the first sound data and the second sound data in the second sound mode, or may modulate any one of the first sound data and the second sound data in the second sound mode. The phase shifter 750 may output the first sound data to the first sound driver 340, and may output the second sound data to the second sound driver 760.

[0102] The phase shifter 750 can shift the phase of the harmonic tone of the second sound, which has the same frequency as the fundamental tone of the first sound or any one of the harmonic tones of the first sound. Therefore, the sound pressure level of the fundamental tone of the third sound or any one of the harmonic tones of the third sound can be lower (or smaller) than the sound pressure level of the fundamental tone of the first sound or any one of the harmonic tones of the first sound, and the third sound is the sum of the first sound and the second sound.

[0103] As described above, due to the phase shifter 750, an amplification effect may occur, causing the sound pressure level of the fundamental tone of the third sound, which is the sum of the first sound and the second sound, to become higher (or larger) than the sound pressure level of the fundamental tone of the first sound, and concurrently (e.g., simultaneously) a cancellation effect may occur, causing the sound pressure level of any one of the harmonic tones of the third sound to become lower (or smaller) than the sound pressure level of any one of the harmonic tones of the first sound. Therefore, it is possible to prevent or reduce the degradation of the sound quality provided to the user due to the harmonic tones of the first sound.

[0104] The main processor 710 may be an application processor, a central processing unit, or a system chip including an integrated circuit.

[0105] The camera device 720 processes an image frame such as a still image or a moving image obtained by an image sensor in a camera mode and outputs the processed image frame to the main processor 710 .

[0106] The cable 314 having passed through the cable hole CAH of the bracket 600 may be connected to the main connector 730. Thus, the main circuit board 700 may be electrically connected to the display circuit board 310.

[0107] The second sound driver 760 receives the second sound data from the phase shifter 750. The second sound driver 760 generates a second sound signal according to the second sound data and outputs the second sound signal to the second sound generator 520.

[0108] In addition, the main circuit board 700 may also be provided with a mobile communication module capable of transmitting and receiving radio signals to and from at least one of a base station, an external terminal, and a server. The radio signal may include various suitable types of data according to transmission / reception of a voice signal, a video call signal, or a text / multimedia message.

[0109] The battery 790 may be disposed so as not to overlap with the main circuit board 700 in the third direction (Z-axis direction). The battery 790 may overlap with the battery hole BH of the bracket 600.

[0110] The lower cover 900 may be disposed below the main circuit board 700 and the battery 790. The lower cover 900 may be coupled and fixed to the bracket 600. The lower cover 900 may form a lower surface appearance of the display device 10. The lower cover 900 may include plastic and / or metal.

[0111] The lower cover 900 may be provided with a second camera hole CMH2, through which the camera device 720 (for example, the camera device 720 provided on the lower surface of the main circuit board 700) is exposed. The position of the camera device 720 and the positions of the first camera hole CMH1 and the second camera hole CMH2 corresponding to the camera device 720 are not limited to Figure 2 The embodiment shown in .

[0112] Figure 3 is a diagram showing an example of an embodiment of the invention being attached to Figure 2 A bottom view of the display panel of the cover window, and Figure 4 is a diagram showing an example of an embodiment of the invention being attached to Figure 3 A bottom view of a bracket on the lower surface of a display panel and a main circuit board arranged on the bracket.

[0113] refer to Figure 3 and Figure 4 , a panel lower member 400 (eg, a panel lower cover) may be disposed below the display panel 300. The panel lower member 400 (eg, a panel lower cover) may be attached to the lower surface of the display panel 300 by an adhesive member. The adhesive member may be a pressure sensitive adhesive (PSA).

[0114] The panel lower member 400 (eg, panel lower cover) may include at least one of a light absorbing member for absorbing light incident from the outside, a buffer member for absorbing external impact, and a heat dissipating member for effectively radiating heat of the display panel 300 .

[0115] The light absorbing member may be disposed below the display panel 300. The light absorbing member suppresses transmission of light to prevent or substantially prevent components disposed below the light absorbing member (e.g., the display circuit board 310, the first sound generator 510, etc.) from being observed or visible from above the display panel 300. The light absorbing member may include a light absorbing material such as a black pigment or dye.

[0116] The buffer member may be disposed below the light absorbing member. The buffer member absorbs external impact to prevent or substantially prevent the display panel 300 from being damaged. The buffer member may be formed as a single layer or multiple layers. For example, the buffer member may be formed of a polymer resin such as polyurethane, polycarbonate, polypropylene and / or polyethylene, or may be formed of an elastic material such as rubber, polyurethane material and / or a sponge formed by foaming an acrylic material. The buffer member may be a cushion layer.

[0117] The heat dissipation member may be disposed below the buffer member. The heat dissipation member may include a first heat dissipation layer including graphite or carbon nanotubes and a second heat dissipation layer capable of blocking electromagnetic waves and formed of a metal thin film of copper, nickel, ferrite and / or silver having good thermal conductivity.

[0118] Meanwhile, the panel lower member 400 may be omitted. In this case, components disposed on the lower surface of the panel lower member 400 (e.g., the display circuit board 310, the first sound generator 510, etc.) may be disposed on the lower surface of the display panel 300 instead of the lower surface of the panel lower member 400.

[0119] The flexible film 390 attached to one side of the display panel 300 may be bent ( Figure 3 The flexible film 390 that has been bent according to an exemplary embodiment is shown) and may be disposed under the panel lower member 400. Therefore, the display circuit board 310 attached to one side of the flexible film 390 may be disposed under the panel lower member 400. The display circuit board 310 may be fixed or attached to the lower surface of the panel lower member 400 under the panel lower member 400 by a fixing member such as a screw or an adhesive member such as a pressure-sensitive adhesive.

[0120] The display circuit board 310 may include a first circuit board 311 and a second circuit board 312. Each of the first circuit board 311 and the second circuit board 312 may be a rigid printed circuit board or a flexible printed circuit board. When any one of the first circuit board 311 and the second circuit board 312 is a rigid printed circuit board and the other of the first circuit board 311 and the second circuit board 312 is a flexible printed circuit board, the display circuit board 310 may be a composite printed circuit board.

[0121] exist Figure 32 shows that the second circuit board 312 extends from one side of the first circuit board 311 in the second direction (Y-axis direction). The width of the second circuit board 312 in the first direction (X-axis direction) may be smaller than the width of the first circuit board 311 in the first direction (X-axis direction).

[0122] The touch drive circuit 330 and the first sound driver 340 may be disposed on one surface of the second circuit board 312, and the first connector 313 and the second connector 316 may be disposed on another surface (e.g., opposite surfaces) of the second circuit board 312. The first connector 313 may include an insertion portion connected to a first connection terminal disposed at one end of the cable 314. The second connector 316 may include an insertion portion connected to a connection terminal disposed at one end of the first flexible circuit board 570.

[0123] The first connection terminal provided at one end of the cable 314 may be inserted into the insertion portion of the first connector 313. The second connection terminal provided at the other end of the cable 314 may be bent toward the lower portion of the main circuit board 700 through the cable hole CAH penetrating the bracket 600 and inserted into the insertion portion of the main connector 730.

[0124] The first sound generator 510 may be disposed on the lower surface of the panel lower member 400. The first sound generator 510 may be attached to the lower surface of the panel lower member 400 by a first adhesive member 610 such as a pressure-sensitive adhesive. Therefore, the display panel 300 may be vibrated in the thickness direction (Z-axis direction) by the first sound generator 510.

[0125] A connection terminal provided at one end of the first flexible circuit board 570 may be inserted into an insertion portion of the second connector 316. The other end of the first flexible circuit board 570 may be connected to the first sound generator 510. The first flexible circuit board 570 may be a flexible printed circuit (FPC).

[0126] The bracket 600 may include a battery hole BH, a cable hole CAH, and a first camera hole CMH1. The battery hole BH, the cable hole CAH, and the first camera hole CMH1 may be holes penetrating the bracket 600.

[0127] Since the battery hole BH is a hole for accommodating the battery 790, the battery 790 can be Figure 5 As shown in FIG. , the battery hole BH overlaps with the battery hole BH along the third direction (Z-axis direction). Figure 5 As shown in , the size of the battery hole BH may be larger than the size of the battery 790 .

[0128] Since the first camera hole CMH1 of the bracket 600 is a hole for accommodating the camera device 720 of the main circuit board 700 , the camera device 720 may overlap with the first camera hole CMH1 in the third direction (Z-axis direction).

[0129] according to Figures 3 to 5 In the embodiment shown in FIG. 5 , the first sound generator 510 may be electrically connected to the display circuit board 310 through the first flexible circuit board 570. The main circuit board 700 and the display circuit board 310 may be electrically connected to each other through the cable 314.

[0130] Figure 5 According to an exemplary embodiment, Figure 3 A cross-sectional view taken along line II'.

[0131] refer to Figure 5 , the display panel 300 may include a substrate SUB1, a pixel array layer PAL, and a polarizing film PF.

[0132] The substrate SUB1 may be a rigid substrate or a flexible substrate capable of bending, folding, curling, etc. The substrate SUB1 may be made of an insulating material such as glass, quartz, or a polymer resin. Examples of polymer resins may include polyethersulfone (PES), polyacrylate (PA), polyarylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide (PI), polycarbonate (PC), cellulose triacetate (CAT), cellulose acetate propionate (CAP), and combinations thereof. The substrate SUB1 may include a metal material.

[0133] The pixel array layer PAL may be disposed on the substrate SUB1. The pixel array layer PAL may be a layer including pixels PX to display an image. Figure 6 As shown in , the pixel array layer PAL may include a thin film transistor layer 303 , a light emitting element layer 304 and a thin film encapsulation layer 305 .

[0134] In order to prevent or reduce the decrease in visibility due to external light reflection, a polarizing film PF may be disposed on the pixel array layer PAL. The polarizing film PF may include a linear polarizer and a phase delay film such as a quarter wave plate. For example, the phase delay film may be disposed on the pixel array layer PAL, and the linear polarizer may be disposed between the phase delay film and the cover window 100.

[0135] The panel lower member 400 may be disposed on a first surface of the display panel 300, and the cover window 100 may be disposed on a second surface of the display panel 300, the second surface of the display panel 300 being opposite to the first surface of the display panel 300. That is, the panel lower member 400 may be disposed on a lower surface of the substrate SUB1 of the display panel 300, and the cover window 100 may be disposed on an upper surface of the polarizing film PF.

[0136] One side of the flexible film 390 may be attached to one side of the substrate SUB1, and the other side of the flexible film 390 may be attached to one side of the display circuit board 310. One side of the flexible film 390 may be attached to one surface of the substrate SUB1 using an anisotropic conductive film. The other side of the flexible film 390 may be attached to one surface of the display circuit board 310 using an anisotropic conductive film. The other surface of the display circuit board 310 opposite to the one surface of the display circuit board 310 may face the panel lower member 400.

[0137] Despite Figure 5 3 shows that the display driving circuit 320 is disposed on one surface of the flexible film 390 , but the present invention is not limited thereto. The display driving circuit 320 may be disposed on another surface of the flexible film 390 opposite to the one surface of the flexible film 390 .

[0138] The display circuit board 310 may be disposed on the lower surface of the panel lower member 400. The display circuit board 310 may be fixed to the lower surface of the panel lower member 400 by a fixing member such as a screw or an adhesive member.

[0139] The touch driving circuit 330 and the first sound driver 340 may be disposed on one surface of the display circuit board 310. The first connector 313 and the second connector 316 may be disposed on the other surface of the display circuit board 310.

[0140] The first sound generator 510 may be disposed between the panel lower member 400 and the bracket 600. The first surface of the first sound generator 510 may be attached to the panel lower member 400 by the first adhesive member 610. Since the first sound generator 510 may be fixed to the panel lower member 400, the display panel 300 may vibrate by the vibration of the first sound generator 510. That is, the first sound generator 510 may output the first sound by vibrating the display panel 300. The first adhesive member 610 may be a pressure-sensitive adhesive. The first flexible circuit board 570 may be attached to the second surface of the first sound generator 510.

[0141] When the first sound generator 510 is disposed on the heat dissipation member of the panel lower member 400, the first heat dissipation layer of the heat dissipation member may be damaged due to the vibration of the first sound generator 510. Therefore, in the area where the first sound generator 510 is disposed, the heat dissipation member may be removed, and the first sound generator 510 may be attached to the lower surface of the buffer member. Alternatively, in the area where the first sound generator 510 is disposed, the buffer member and the heat dissipation member may be removed, and the first sound generator 510 may be attached to the lower surface of the light absorbing member.

[0142] The first flexible circuit board 570 (e.g., a first flexible printed circuit board) may be attached to the second surface of the first sound generator 510 using an anisotropic conductive film. Leads of the first flexible circuit board 570 may be connected to the first electrode and the second electrode of the first sound generator 510, respectively. A connection terminal provided at one end of the first flexible circuit board 570 may be connected to the lead. The connection terminal of the first flexible circuit board 570 may be inserted into the insertion portion of the second connector 316. The first flexible circuit board 570 may be a flexible printed circuit (FPC) or a flexible film.

[0143] Figure 6 The exemplary embodiment is specifically shown Figure 5 A cross-sectional view of a display area of ​​a display panel.

[0144] refer to Figure 6 , the display panel 300 may include a substrate SUB1 and a pixel array layer PAL. Figure 6 As shown in , the pixel array layer PAL may include a thin film transistor layer 303 , a light emitting element layer 304 and a thin film encapsulation layer 305 .

[0145] The buffer film 302 may be formed on the substrate SUB1. The buffer film 302 may be formed on the substrate SUB1 to protect the thin film transistor 335 and the light emitting element from moisture that penetrates through the substrate SUB1 (which is easily affected by moisture). The buffer film 302 may be formed of a plurality of alternately stacked inorganic films. For example, the buffer film 302 may be formed as a multilayer film in which silicon oxide (SiO x ), silicon nitride (SiN x ) and one or more inorganic layers of one or more of SiON are alternately stacked. In some embodiments, the buffer film 302 may be omitted.

[0146] The thin film transistor layer 303 is provided on the buffer film 302. The thin film transistor layer 303 includes a thin film transistor 335, a gate insulating film 336, an interlayer insulating film 337, a protective film 338, and a planarizing film 339.

[0147] Each of the thin film transistors 335 includes an active layer 331, a gate electrode 332, a source electrode 333, and a drain electrode 334. Figure 6 3 shows a thin film transistor 335 formed by a top gate method, wherein the gate electrode 332 is located on the active layer 331, but it should be noted that the present invention is not limited thereto. That is, the thin film transistor 335 may be formed by a bottom gate method, wherein the gate electrode 332 is located below the active layer 331, or may be formed by a dual gate method, wherein the gate electrode 332 is located both above and below the active layer 331.

[0148] The active layer 331 is formed on the buffer film 302. The active layer 331 may be formed of a silicon-based semiconductor material or an oxide-based semiconductor material. A light blocking layer for blocking external light from being incident on the active layer 331 may be formed between the buffer film 302 and the active layer 331.

[0149] The gate insulating film 336 may be formed on the active layer 331. The gate insulating film 336 may be formed of an inorganic film (eg, silicon oxide (SiO x ) film, silicon nitride (SiN x ) film or its multilayer film) is formed.

[0150] The gate electrode 332 and the gate line may be formed on the gate insulating film 336. The gate electrode 332 and the gate line may be formed of a single layer or multiple layers including at least one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and alloys thereof.

[0151] The interlayer insulating film 337 may be formed on the gate electrode 332 and the gate line. The interlayer insulating film 337 may be made of an inorganic film (eg, silicon oxide (SiO x ) film, silicon nitride (SiN x ) film or its multilayer film) is formed.

[0152] The source electrode 333, the drain electrode 334, and the data line may be formed on the interlayer insulating film 337. Each of the source electrode 333 and the drain electrode 334 may be connected to the active layer 331 through a contact hole penetrating the gate insulating film 336 and the interlayer insulating film 337. The source electrode 333, the drain electrode 334, and the data line may be formed of a single layer or a multilayer including at least one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), and / or an alloy thereof.

[0153] A protective film 338 for isolating the thin film transistor 335 may be formed on the source electrode 333, the drain electrode 334, and the data line. The protective film 338 may be made of an inorganic film (e.g., silicon oxide (SiO x) film, silicon nitride (SiN x ) film or its multilayer film) is formed.

[0154] A planarization film 339 for leveling a step due to the thin film transistor 335 may be formed on the protective film 338. The planarization film 339 may be formed of an organic film including acrylic resin, epoxy resin, phenol resin, polyamide resin, and / or polyimide resin.

[0155] The light emitting element layer 304 is formed on the thin film transistor layer 303. The light emitting element layer 304 includes a light emitting element and a pixel definition film 344.

[0156] A light emitting element and a pixel defining film 344 are formed on the planarization film 339. The light emitting element may be an organic light emitting element including an anode electrode 341, a light emitting layer 342, and a cathode electrode 343.

[0157] The anode electrode 341 may be formed on the planarization film 339. The anode electrode 341 may be connected to the drain electrode 334 of the thin film transistor 335 through a contact hole penetrating the protection film 338 and the planarization film 339.

[0158] A pixel defining film 344 may be formed on the planarization film 339 to cover the edge of the anode electrode 341, thereby defining the pixel PX. That is, the pixel defining film 344 is used to define the pixel PX. Each of the pixels PX refers to a region where the anode electrode 341, the light emitting layer 342, and the cathode electrode 343 are sequentially stacked, and holes from the anode electrode 341 and electrons from the cathode electrode 343 are combined with each other in the light emitting layer 342 to emit light.

[0159] The light emitting layer 342 is formed on the anode electrode 341 and the pixel defining film 344. The light emitting layer 342 is an organic light emitting layer. The light emitting layer 342 may emit one of red light, green light, and blue light. The light emitting layer 342 may be a white light emitting layer that emits white light. In this case, the light emitting layer 342 may have a stacked structure of a red light emitting layer, a green light emitting layer, and a blue light emitting layer, and may be a common layer formed in common in the pixel PX. In this case, the display panel 300 may further include separate color filters for displaying red, green, and blue.

[0160] The light emitting layer 342 may include a hole transport layer, a light emitting layer, and an electron transport layer. In addition, the light emitting layer 342 may be formed in a tandem structure having two or more stacks, and in this case, a charge generation layer may be formed between the stacks.

[0161] The cathode electrode 343 is formed on the light emitting layer 342. The cathode electrode 343 may be formed to cover the light emitting layer 342. The cathode electrode 343 may be a common layer commonly formed in the pixels PX.

[0162] When the light emitting element layer 304 is formed according to the top emission mode of emitting light upward, the anode electrode 341 can be formed by a high reflectivity metal material such as a laminated structure of aluminum and titanium (Ti / Al / Ti), a laminated structure of aluminum and ITO (ITO / Al / ITO), an APC alloy, or a laminated structure of an APC alloy and ITO (ITO / APC / ITO). The APC alloy can be an alloy of silver (Ag), palladium (Pd) and copper (Cu). The cathode electrode 343 can be formed by a transparent conductive material (TCO) such as ITO or IZO that transmits light, or a semi-transmissive conductive material such as magnesium (Mg), silver (Ag) or an alloy of magnesium (Mg) and silver (Ag). When the cathode electrode 343 is formed by a semi-transmissive conductive material, the luminous efficiency can be improved by a microcavity.

[0163] When the light emitting element layer 304 is formed by a bottom emission method that emits light downward, the anode electrode 341 can be formed of a transparent conductive material (TCO) such as ITO or IZO or a semi-transmissive conductive material such as magnesium (Mg), silver (Ag) or an alloy of magnesium (Mg) and silver (Ag). The cathode electrode 343 can be formed of a high reflectivity metal material such as a laminated structure of aluminum and titanium (Ti / Al / Ti), a laminated structure of aluminum and ITO (ITO / Al / ITO), an APC alloy or a laminated structure of an APC alloy and ITO (ITO / APC / ITO). When the anode electrode 341 is formed of a semi-transmissive conductive material, the luminous efficiency can be improved by a microcavity.

[0164] The thin film encapsulation layer 305 is formed on the light emitting element layer 304. The thin film encapsulation layer 305 is used to prevent or reduce oxygen or moisture from penetrating the light emitting layer 342 and the cathode electrode 343. For this purpose, the thin film encapsulation layer 305 may include at least one inorganic film. The inorganic film may be formed of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide and / or titanium oxide. The thin film encapsulation layer 305 may also include at least one organic film. The organic film may be formed to have a sufficient thickness to prevent or substantially prevent foreign matter (particles) from penetrating the thin film encapsulation layer 305 and entering the light emitting layer 342 and the cathode electrode 343. The organic film may include any one of epoxy resin, acrylate and urethane acrylate.

[0165] The touch sensor layer may be formed on the thin film encapsulation layer 305. When the touch sensor layer is directly formed on the thin film encapsulation layer 305, there is an advantage that the thickness of the display device 10 may be reduced compared to when a separate touch panel is attached to the thin film encapsulation layer 305.

[0166] The touch sensor layer may include a touch electrode for sensing a user's touch in a capacitive manner and a touch line for connecting a pad and the touch electrode. For example, the touch sensor layer may sense a user's touch in a self-capacitive manner or a mutual-capacitive manner.

[0167] Figure 7 The exemplary embodiment is specifically shown Figure 5 A cross-sectional view of a first sound generator, and Figure 8 is a diagram showing the configuration of the Figure 7 A view of a method of vibrating a vibration layer between a first branch electrode and a second branch electrode of a first sound generator.

[0168] refer to Figure 7 and Figure 8 The first sound generator 510 may be a piezoelectric element or a piezoelectric actuator for vibrating the display panel 300 using a piezoelectric material that contracts or expands according to an applied voltage. The first sound generator 510 may include a vibration layer 511, a first electrode 512, and a second electrode 513.

[0169] The first electrode 512 may include a first stem electrode 5121 and a first branch electrode 5122. The first stem electrode 5121 may be disposed on at least one side surface of the vibration layer 511. Figure 7 Alternatively, the first stem electrode 5121 may be disposed to penetrate a portion of the vibration layer 511. The first stem electrode 5121 may be disposed on an upper surface of the vibration layer 511. The first branch electrodes 5122 may branch from the first stem electrode 5121. The first branch electrodes 5122 may be arranged in parallel with each other.

[0170] The second electrode 513 may include a second stem electrode 5131 and a second branch electrode 5132. The second electrode 513 may be spaced apart from the first electrode 512. Therefore, the second electrode 513 may be electrically separated from the first electrode 512. The second stem electrode 5131 may be disposed on at least one side surface of the vibration layer 511. In this case, the first stem electrode 5121 may be disposed on a first side surface of the vibration layer 511, and the second stem electrode 5131 may be disposed on a second side surface of the vibration layer 511. Alternatively, the second stem electrode 5131 may be disposed to penetrate a portion of the vibration layer 511. The second stem electrode 5131 may be disposed on an upper surface of the vibration layer 511. The second branch electrode 5132 may branch from the second stem electrode 5131. The second branch electrodes 5132 may be arranged in parallel with each other.

[0171] The first branch electrode 5122 and the second branch electrode 5132 may be arranged parallel to each other in the horizontal direction (X-axis direction or Y-axis direction). In addition, the first branch electrode 5122 and the second branch electrode 5132 may be alternately arranged in the vertical direction (Z-axis direction). That is, the first branch electrode 5122 and the second branch electrode 5132 may be repeatedly arranged in the vertical direction (Z-axis direction) in the order of the first branch electrode 5122, the second branch electrode 5132, the first branch electrode 5122 and the second branch electrode 5132.

[0172] The first electrode 512 and the second electrode 513 may be connected to the pads of the first flexible circuit board 570. The pads of the first flexible circuit board 570 may be connected to the first electrode 512 and the second electrode 513 exposed on one surface of the first sound generator 510.

[0173] The vibration layer 511 may be a piezoelectric element that is deformed according to a driving voltage applied to the first electrode 512 and a driving voltage applied to the second electrode 513. In this case, the vibration layer 511 may be made of any one of a piezoelectric material such as polyvinylidene fluoride (PVDF) or lead zirconate titanate (PZT) and an electroactive polymer.

[0174] Since the vibration layer 511 is formed at a high temperature, the first electrode 512 and the second electrode 513 may be formed of an alloy of silver (Ag) and palladium (Pd) each having a high melting point or silver (Ag). When the first electrode 512 and the second electrode 513 are formed of an alloy of silver (Ag) and palladium (Pd) to increase the melting point of the first electrode 512 and the second electrode 513, the content of silver (Ag) may be higher than the content of palladium (Pd).

[0175] The vibration layer 511 may be disposed between the first branch electrode 5122 and the second branch electrode 5132. The vibration layer 511 contracts or expands according to a difference between a driving voltage applied to the first branch electrode 5122 and a driving voltage applied to the second branch electrode 5132.

[0176] like Figure 7As shown in , the polarity direction of the vibration layer 511 disposed between the first branch electrode 5122 and the second branch electrode 5132 disposed below the first branch electrode 5122 may be an upward direction (↑), the vibration layer 511 has a positive polarity in an upper region adjacent to the first branch electrode 5122, and has a negative polarity in a lower region adjacent to the second branch electrode 5132. In addition, the polarity direction of the vibration layer 511 disposed between the second branch electrode 5132 and the first branch electrode 5122 disposed below the second branch electrode 5132 may be a downward direction (↓), the vibration layer 511 has a negative polarity in an upper region adjacent to the second branch electrode 5132, and has a positive polarity in a lower region adjacent to the first branch electrode 5122. The polarity direction of the vibration layer 511 may be determined by a polarization process in which an electric field is applied to the vibration layer 511 using the first branch electrode 5122 and the second branch electrode 5132.

[0177] like Figure 8 As shown in , in the case where the polarity direction of the vibration layer 511 disposed between the first branch electrode 5122 and the second branch electrode 5132 disposed below the first branch electrode 5122 is an upward direction (↑), when a driving voltage having a positive polarity is applied to the first branch electrode 5122 and a driving voltage having a negative polarity is applied to the second branch electrode 5132, the vibration layer 511 may be contracted by a first force F1. The first force F1 may be a contraction force. In addition, when a driving voltage having a negative polarity is applied to the first branch electrode 5122 and a driving voltage having a positive polarity is applied to the second branch electrode 5132, the vibration layer 511 may be expanded by a second force F2. The second force F2 may be a tensile force.

[0178] Similar to Figure 8 , in the case where the polarity direction of the vibration layer 511 disposed between the second branch electrode 5132 and the first branch electrode 5122 disposed below the second branch electrode 5132 is in the downward direction (↓), when a driving voltage having a positive polarity is applied to the second branch electrode 5132 and a driving voltage having a negative polarity is applied to the first branch electrode 5122, the vibration layer 511 may be expanded by a tensile force. In addition, when a driving voltage having a negative polarity is applied to the second branch electrode 5132 and a driving voltage having a positive polarity is applied to the first branch electrode 5122, the vibration layer 511 may be contracted by a contraction force.

[0179] When the driving voltage applied to the first electrode 512 and the driving voltage applied to the second electrode 513 are repeated alternately with positive polarity and negative polarity, the vibration layer 511 repeatedly contracts and expands. Therefore, the first sound generator 510 vibrates. Since the first sound generator 510 is provided on one surface of the display panel 300, when the vibration layer 511 of the first sound generator 510 contracts and expands, the display panel 300 vibrates in the third direction (Z-axis direction) by stress, and the third direction (Z-axis direction) is the thickness direction of the display panel 300. Therefore, the display panel 300 can vibrate by the first sound generator 510, thereby outputting the first sound.

[0180] A protective layer 519 may be additionally provided on the second surface and the side surface of the first sound generator 510. The protective layer 519 may be formed of an insulating material, or may be formed of the same material as the vibration layer 511. The protective layer 519 may be disposed on the first electrode 512, the second electrode 513, and the vibration layer 511 exposed by the first electrode 512 and the second electrode 513 but not covered by the first electrode 512 and the second electrode 513. The protective layer 519 may be disposed to surround the first electrode 512, the second electrode 513, and the vibration layer 511 exposed by the first electrode 512 and the second electrode 513 but not covered by the first electrode 512 and the second electrode 513. Therefore, the vibration layer 511, the first electrode 512, and the second electrode 513 of the first sound generator 510 may be protected by the protective layer 519. In some embodiments, the protective layer 519 may be omitted.

[0181] Fig. 9 The exemplary embodiment is specifically shown Figure 5 A stereoscopic view of a second sound generator.

[0182] refer to Fig. 9 The second sound generator 520 may be a linear resonance actuator (LRA) that generates magnetic force by using a voice coil to vibrate the display panel 300. The second sound generator 520 may include a lower chassis 521, a flexible circuit board 522, a voice coil 523, a magnet 524, a spring 525, and an upper chassis 526.

[0183] The lower frame 521 and the upper frame 526 may be formed of a metal material. The flexible circuit board 522 may be provided on one surface of the lower frame 521 facing the upper frame 526, and may be connected to the second flexible circuit board 527. The voice coil 523 may be connected to one surface of the flexible circuit board 522 facing the upper frame 526. Therefore, one end of the voice coil 523 may be electrically connected to one of the leads of the second flexible circuit board 527, and the other end of the voice coil 523 may be electrically connected to another of the leads of the second flexible circuit board 527. The magnet 524 is a permanent magnet, and one surface of the magnet 524 facing the voice coil 523 may be provided with a voice coil groove 524a for accommodating the voice coil 523. The spring 525 as an elastic body is provided between the magnet 524 and the upper frame 526.

[0184] The direction of the current flowing in the voice coil 523 may be controlled by a first driving voltage applied to one end of the voice coil 523 and a second driving voltage applied to the other end of the voice coil 523. An applied magnetic field may be formed around the voice coil 523 according to the current flowing in the voice coil 523. That is, the direction of the current flowing in the voice coil 523 when the first driving voltage is a positive polarity voltage and the second driving voltage is a negative polarity voltage is opposite to the direction of the current flowing in the voice coil 523 when the first driving voltage is a negative polarity voltage and the second driving voltage is a positive polarity voltage. According to the alternating current (AC) driving of the first driving voltage and the second driving voltage, the attractive force and the repulsive force act alternately on the magnet 524 and the voice coil 523. Therefore, the magnet 524 may reciprocate between the voice coil 523 and the upper frame 526 through the spring 525.

[0185] Meanwhile, vibration due to the reciprocating motion of the magnet 524 may be transmitted to both the lower frame 521 and the upper frame 526. Therefore, the lower frame 521 may face the bracket 600, and the upper frame 526 may face the display panel 300. Alternatively, the lower frame 521 may face the display panel 300, and the upper frame 526 may face the bracket 600.

[0186] according to Fig. 9 In the embodiment shown in FIG. 6 , the bracket 600 may vibrate by the reciprocating motion of the magnet 524 of the second sound generator 520 , thereby outputting the second sound or providing a tactile sensation.

[0187] Fig.10 is a flowchart illustrating a sound providing method of a display apparatus according to an exemplary embodiment.

[0188] refer to Fig.10 First, the main processor 710 can select one of the first sound mode and the second sound mode ( Fig.10 S101).

[0189] The first sound mode may be a mode for preventing or reducing degradation in sound quality due to harmonic tones of the first sound, and the second sound mode may be a mode for providing a user with sound having both low and high frequency bands.

[0190] Second, the main processor 710 may generate first sound data in the first sound mode and output the first sound data to the phase shifter 750 ( Fig.10 S102).

[0191] The main processor 710 receives sound source data from the outside. The main processor 710 outputs the sound source data to the memory 740, and receives sound data from the memory 740. Since the memory 740 stores the sound data according to the frequency of the sound source data, the memory 740 can output the sound data to the main processor 710 using the frequency of the sound source data as an input address. The main processor 710 can generate first sound data according to the sound data input from the memory 740. The main processor 710 outputs the first sound data to the phase shifter 750.

[0192] Third, the phase shifter 750 enables Fig.11 The phase of each of the fundamental tone FT1 of the first sound and the first harmonic tone HT11, the second harmonic tone HT12, the third harmonic tone HT13 and the fourth harmonic tone HT14 shown in FIG. 1 is shifted to produce Fig.12The fundamental tone FT2 of the second sound and the first harmonic tone HT21, the second harmonic tone HT22, the third harmonic tone HT23 and the fourth harmonic tone HT24 are shown in FIG. The phase shifter 750 can shift the phase of the fundamental tone FT1 of the first sound to produce the fundamental tone FT2 of the second sound, thereby obtaining an effect of amplifying the fundamental tone FT1 of the first sound by the fundamental tone FT2 of the second sound (for example, due to constructive interference) (i.e., amplifying the fundamental tone FT1 of the first sound by the fundamental tone FT2 of the second sound). In addition, the phase shifter 750 can shift the phase of each of the first harmonic tone HT11, the second harmonic tone HT12, the third harmonic tone HT13 and the fourth harmonic tone HT14 of the first sound to produce the first harmonic tone HT21, the second harmonic tone HT22, the third harmonic tone HT23 and the fourth harmonic tone HT24 of the second sound, thereby obtaining an effect of canceling the first harmonic tone HT11, the second harmonic tone HT12, the third harmonic tone HT13 and the fourth harmonic tone HT14 of the first sound by the first harmonic tone HT21, the second harmonic tone HT22, the third harmonic tone HT23 and the fourth harmonic tone HT24 of the second sound (for example, due to destructive interference) (i.e., canceling the first harmonic tone HT11, the second harmonic tone HT12, the third harmonic tone HT13 and the fourth harmonic tone HT14 of the first sound by the first harmonic tone HT21, the second harmonic tone HT22, the third harmonic tone HT23 and the fourth harmonic tone HT24 of the second sound) ( Fig.10 S103).

[0193] The phase shifter 750 modulates the first sound data and outputs the second sound data. The first sound includes a fundamental tone FT1 and harmonic tones HT11, HT12, HT13, and HT14, and the second sound includes a fundamental tone FT2 and harmonic tones HT21, HT22, HT23, and HT24. The first sound data includes information about the frequency and sound pressure level or amplitude of the fundamental tone of the first sound, and the first sound data includes information about the frequency and sound pressure level or amplitude of the harmonic tones of the first sound. The second sound data includes information about the frequency and sound pressure level or amplitude of the fundamental tone of the second sound, and the second sound data includes information about the frequency and sound pressure level or amplitude of the harmonic tones of the second sound.

[0194] The phase shifter 750 makes the fundamental tone FT1 (eg Fig.11 ) is phase-shifted to produce the fundamental tone FT2 of the second sound (as shown in Fig.12 ), so that the third sound ( Fig.13The sound pressure level of the fundamental tone FT3 of the first sound (shown in FIG. 1 ) is higher (or greater) than the sound pressure level of the fundamental tone FT1 of the first sound. The time period during which the positive amplitude region of the fundamental tone FT1 of the first sound overlaps with the positive amplitude region of the fundamental tone FT2 of the second sound may be T / 2 or greater, as shown in FIG. Fig.14 Therefore, Fig.15 As shown in , the difference between the phase θ1 of the fundamental tone FT1 of the first sound and the phase θ2 of the fundamental tone FT2 of the second sound can be in the range from -90° to 90°. In this case, the amplitude C of the fundamental tone FT3 of the third sound can be greater than (or higher than) the amplitude A of the fundamental tone FT1 of the first sound and the amplitude B of the fundamental tone FT2 of the second sound.

[0195] exist Fig.14 As shown in FIG. 1 , each of the period of the basic tone FT1 of the first sound and the period of the basic tone FT2 of the second sound is 2T. Fig.14 , each of the amplitude of the fundamental tone FT1 of the first sound and the amplitude of the fundamental tone FT2 of the second sound is H. Fig.15 , the amplitude of the basic tone FT1 of the first sound is A and the phase of the basic tone FT1 of the first sound is θ1, the amplitude of the basic tone FT2 of the second sound is B and the phase of the basic tone FT2 of the second sound is θ2, and the amplitude of the basic tone FT3 of the third sound is C and the phase of the basic tone FT3 of the third sound is θ3. Fig.15 , θ1 may be 0°, each of θ2 and θ3 may be less than 90°, and θ3 may have a value between θ1 and θ2.

[0196] The phase shifter 750 shifts the phases of the respective harmonic tones HT11, HT12, HT13, and HT14 of the first sound to generate the harmonic tones HT21, HT22, HT23, and HT24 of the second sound. In order to make the sound pressure level of each of the harmonic tones HT31, HT32, HT33, and HT34 of the third sound lower than (or less than) the sound pressure level of each of the harmonic tones HT11, HT12, HT13, and HT14 of the first sound, the difference between the phase of each of the harmonic tones HT11, HT12, HT13, and HT14 of the first sound and the phase of each of the harmonic tones HT21, HT22, HT23, and HT24 of the second sound may be within a second range.

[0197] For example, to make the first harmonic tone HT31 ( Fig.13 The sound pressure level of the first harmonic tone HT11 (shown in Fig.11), the time period during which the positive amplitude region of the first harmonic tone HT11 of the first sound overlaps the negative amplitude region of the first harmonic tone HT21 of the second sound may be T / 4 or greater, as shown in Fig.16 Therefore, the difference between the phase θ4 of the first harmonic tone HT11 of the first sound and the phase θ5 of the first harmonic tone HT21 of the second sound can be less than -90° and greater than 90°, as shown in FIG. Fig.17 In this case, the amplitude F of the first harmonic tone HT31 of the third sound may be smaller than (or lower than) the amplitude D of the first harmonic tone HT11 of the first sound and the amplitude E of the first harmonic tone HT21 of the second sound.

[0198] exist Fig.16 , each of the period of the first harmonic tone HT11 of the first sound and the period of the first harmonic tone HT21 of the second sound is 1T. Fig.16 As shown in , each of the amplitude of the first harmonic tone HT11 of the first sound and the amplitude of the first harmonic tone HT21 of the second sound is G. In addition, as Fig.17 As shown in , the amplitude of the first harmonic wave tone HT11 of the first sound is D and the phase of the first harmonic wave tone HT11 of the first sound is θ4, the amplitude of the first harmonic wave tone HT21 of the second sound is E and the phase of the first harmonic wave tone HT21 of the second sound is θ5, and the amplitude of the first harmonic wave tone HT31 of the third sound is F and the phase of the first harmonic wave tone HT31 of the third sound is θ6. Fig.17 , θ4 may be 0°, θ5 may be greater than 90°, and θ6 may have a value between θ4 and θ5.

[0199] like Fig.13 As shown in , in order to make the sound pressure level of the second harmonic tone HT32 of the third sound lower than (or less than) the sound pressure level of the second harmonic tone HT12 of the first sound, the time period during which the positive amplitude region of the second harmonic tone HT12 of the first sound overlaps with the negative amplitude region of the second harmonic tone HT22 of the second sound can be T / 4 or greater. In this case, the difference between the phase of the second harmonic tone HT12 of the first sound and the phase of the second harmonic tone HT22 of the second sound can be less than -90° and greater than 90°. In addition, the amplitude of the second harmonic tone HT32 of the third sound can be less than (or lower than) the amplitude of the second harmonic tone HT12 of the first sound and the amplitude of the second harmonic tone HT22 of the second sound.

[0200] like Fig.13As shown in, in order to make the sound pressure level of the third harmonic tone HT33 of the third sound lower than (or less than) the sound pressure level of the third harmonic tone HT13 of the first sound, the time period during which the positive amplitude region of the third harmonic tone HT13 of the first sound overlaps with the negative amplitude region of the third harmonic tone HT23 of the second sound can be T / 4 or greater. Therefore, the difference between the phase of the third harmonic tone HT13 of the first sound and the phase of the third harmonic tone HT23 of the second sound can be less than -90° and greater than 90°. In addition, the amplitude of the third harmonic tone HT33 of the third sound can be less than (or lower than) the amplitude of the third harmonic tone HT13 of the first sound and the amplitude of the third harmonic tone HT23 of the second sound.

[0201] like Fig.13 As shown in, in order to make the sound pressure level of the fourth harmonic wave tone HT34 of the third sound lower than (or less than) the sound pressure level of the fourth harmonic wave tone HT14 of the first sound, the time period during which the positive amplitude region of the fourth harmonic wave tone HT14 of the first sound overlaps with the negative amplitude region of the fourth harmonic wave tone HT24 of the second sound can be T / 4 or greater. To this end, the difference between the phase of the fourth harmonic wave tone HT14 of the first sound and the phase of the fourth harmonic wave tone HT24 of the second sound can be less than -90° and greater than 90°. In addition, the amplitude of the fourth harmonic wave tone HT34 of the third sound can be less than (or lower than) the amplitude of the fourth harmonic wave tone HT14 of the first sound and the amplitude of the fourth harmonic wave tone HT24 of the second sound.

[0202] Since the phase shifter 750 shifts the phase of each of the fundamental tone and the harmonic tones of the first sound to generate the fundamental tone and the harmonic tones of the second sound, the frequency of the fundamental tone FT1 of the first sound may be substantially the same as the frequency of the fundamental tone FT2 of the second sound. In addition, the frequency of each of the harmonic tones HT11, HT12, HT13, and HT14 of the first sound may be substantially the same as the frequency of each of the harmonic tones HT21, HT22, HT23, and HT24 of the second sound. For example, the frequency of the first harmonic tone HT11 of the first sound may be substantially the same as the frequency of the first harmonic tone HT21 of the second sound. The frequency of the second harmonic tone HT12 of the first sound may be substantially the same as the frequency of the second harmonic tone HT22 of the second sound. The frequency of the third harmonic tone HT13 of the first sound may be substantially the same as the frequency of the third harmonic tone HT23 of the second sound. The frequency of the fourth harmonic tone HT14 of the first sound may be substantially the same as the frequency of the fourth harmonic tone HT24 of the second sound.

[0203] The sound pressure level or amplitude of the fundamental tone FT1 of the first sound may be different from the sound pressure level or amplitude of the fundamental tone FT2 of the second sound. When the sound pressure level or amplitude of the first harmonic tone HT11 of the first sound is substantially the same as the sound pressure level or amplitude of the first harmonic tone HT21 of the second sound, the sound pressure level of the first harmonic tone HT31 of the third sound may be reduced or minimized. However, even when the sound pressure level or amplitude of the first harmonic tone HT11 of the first sound is different from the sound pressure level or amplitude of the first harmonic tone HT21 of the second sound, the sound pressure level or amplitude of the first harmonic tone HT31 of the third sound may be lower than (or smaller than) the sound pressure level or amplitude of the first harmonic tone HT11 of the first sound. Therefore, the sound pressure level or amplitude of the first harmonic tone HT11 of the first sound may not be substantially the same as the sound pressure level or amplitude of the first harmonic tone HT21 of the second sound. The sound pressure level or amplitude of the second harmonic tone HT12 of the first sound may also be substantially the same as or different from the sound pressure level or amplitude of the second harmonic tone HT22 of the second sound. The sound pressure level or amplitude of the third harmonic wave tone HT13 of the first sound may also be substantially the same as or different from the sound pressure level or amplitude of the third harmonic wave tone HT23 of the second sound. The sound pressure level or amplitude of the fourth harmonic wave tone HT14 of the first sound may also be substantially the same as or different from the sound pressure level or amplitude of the fourth harmonic wave tone HT24 of the second sound.

[0204] Meanwhile, in order to obtain an amplification effect of making the sound pressure level of the fundamental tone of the third sound, which is the sum of the first sound and the second sound, higher (or larger) than the sound pressure level of the fundamental tone of the first sound, or to obtain a cancellation effect of making the sound pressure level of at least one of the harmonic tones of the third sound lower (or smaller) than the sound pressure level of at least one of the harmonic tones of the first sound, information about the distance between the first sound generator 510 and the second sound generator 520 is desirable. The phase shifter 750 stores information about the distance between the first sound generator 510 and the second sound generator 520. Therefore, in order to obtain a desired amplification effect or a desired cancellation effect, the phase shifter 750 can calculate how much the phase of each of the fundamental tone and the harmonic tones of the first sound should be shifted.

[0205] The phase shifter 750 can output second sound data including information about the frequency and sound pressure level or amplitude of the basic tone of the second sound to the second sound driver 760 in the first sound mode, and can output second sound data including information about the frequency and sound pressure level or amplitude of the harmonic tone of the second sound to the second sound driver 760 in the first sound mode.

[0206] At the same time, for the convenience of explanation, Figures 11 to 13, it is shown that the harmonic tones of the second sound having the opposite phase to the harmonic tones of the first sound are arranged in the direction opposite to the Y-axis direction (ie, the harmonic tones having the opposite phase are arranged on the opposite sides of the Y-axis).

[0207] exist Fig.10 In action S103, due to the phase shifter 750, an amplification effect of making the sound pressure level of the fundamental tone of the third sound, which is the sum of the first sound and the second sound, higher (or larger) than the sound pressure level of the fundamental tone of the first sound can be obtained, and concurrently (for example, simultaneously) a cancellation effect of making the sound pressure level of any one of the harmonic tones of the third sound lower (or smaller) than the sound pressure level of any one of the harmonic tones of the first sound can be obtained. Therefore, a decrease in the sound quality provided to the user due to the harmonic tones of the first sound can be prevented or reduced, and high-quality sound can be provided by increasing the sound pressure level of the fundamental tone of the first sound.

[0208] Fourth, the main processor 710 may generate the first sound data and the second sound data in the second sound mode, and output the first sound data and the second sound data to the phase shifter 750 ( Fig.10 S104).

[0209] The main processor 710 outputs the sound source data to the memory 740, and receives the sound data from the memory 740. Since the memory 740 stores the sound data according to the frequency of the sound source data, the memory 740 can output the sound data to the main processor 710 using the frequency of the sound source data as an input address. The main processor 710 can generate the first sound data and the second sound data according to the sound data input from the memory 740. The main processor 710 outputs the first sound data and the second sound data to the phase shifter 750.

[0210] Fifth, the phase shifter 750 shifts the phase of the harmonic tone of the second sound having the same frequency as any one of the fundamental tone and the harmonic tone of the first sound ( Fig.10 S105).

[0211] When the first sound generator 510 is a piezoelectric element or a piezoelectric actuator and the second sound generator 520 is a linear resonant actuator (LRA), the first sound generator 510 outputs a first sound of a relatively higher frequency band than the second sound generator 520, and the second sound generator 520 outputs a second sound of a relatively lower frequency band than the first sound generator 510. For example, Fig.18As shown in , when the second frequency band F2 indicating the frequency band of the second sound is 0 Hz to 800 Hz (for example, in other embodiments the frequency band may be 100 Hz to 800 Hz) and the first frequency band F1 indicating the frequency band of the first sound is 600 Hz to 2 kHz, the third frequency band F3 in which the first frequency band F1 and the second frequency band F2 overlap each other may be 600 Hz to 800 Hz. The phase shifter 750 may increase the sound pressure level of the fundamental tone of the first sound or reduce the sound pressure level of any one of the harmonic tones of the first sound by using the harmonic tones of the second sound having the same frequency as each of the fundamental tone and the harmonic tones of the first sound in the third frequency band F3.

[0212] The phase shifter 750 can shift the phase of any one harmonic tone of the second sound having the same frequency as the fundamental tone of the first sound. In order to increase the sound pressure level of the fundamental tone of the first sound, the time period during which the positive amplitude region of the fundamental tone of the first sound overlaps with the positive amplitude region of any one harmonic tone of the second sound can be T / 4 or more. In this case, the difference between the phase of the fundamental tone of the first sound and the phase of any one harmonic tone of the second sound can be in the range from -90° to 90°.

[0213] The phase shifter 750 may shift the phase of another harmonic tone of the second sound having the same frequency as any one harmonic tone of the first sound. In order to reduce the sound pressure level of any one harmonic tone of the first sound, a time period during which a positive amplitude region of any one harmonic tone of the first sound overlaps a negative amplitude region of another harmonic tone of the second sound may be T / 4 or greater. In this case, a difference between a phase of any one harmonic tone of the first sound and a phase of another harmonic tone of the second sound may be less than -90° and greater than 90°.

[0214] The phase shifter 750 may output the first sound data to the first sound driver 340 in the second sound mode, and may output the second sound data to the second sound driver 760 in the second sound mode.

[0215] exist Fig.10 In action S105, due to the phase shifter 750, an amplification effect of increasing the sound pressure level of the fundamental tone of the first sound can be obtained, and concurrently (e.g., simultaneously) a cancellation effect of reducing the sound pressure level of any one of the harmonic tones of the first sound can be obtained. Therefore, a decrease in the sound quality provided to the user due to the harmonic tones of the first sound can be prevented or reduced, and high-quality sound can be provided by increasing the sound pressure level of the fundamental tone of the first sound.

[0216] Sixth, the first sound driver 340 may generate a first sound signal according to the first sound data and output the first sound signal to the first sound generator 510, and the second sound driver 760 may generate a second sound signal according to the second sound data and output the second sound signal to the second sound generator 520 ( Fig.10 S106).

[0217] The first sound driver 340 receives the first sound data from the main circuit board 700. The first sound driver 340 may generate a first sound signal including a first sound driving voltage and a second sound driving voltage according to the first sound data. For this purpose, the first sound driver 340 may include a digital signal processor (DSP) for processing the sound data as a digital signal, a digital-to-analog converter (DAC) for converting the sound data output from the digital signal processor into a sound driving voltage as an analog signal, and an amplifier (AMP) for amplifying and outputting the sound driving voltage. The first sound driver 340 may output the first sound signal to the first sound generator 510.

[0218] The second sound driver 760 receives the second sound data from the phase shifter 750. The second sound driver 760 may generate a second sound signal including a third sound driving voltage and a fourth sound driving voltage according to the second sound data. For this purpose, the second sound driver 760 may include a digital signal processor (DSP) for processing the sound data as a digital signal, a digital-to-analog converter (DAC) for converting the sound data output from the digital signal processor into a sound driving voltage as an analog signal, and an amplifier (AMP) for amplifying and outputting the sound driving voltage. The second sound driver 760 may output the second sound signal to the second sound generator 520.

[0219] The first sound generator 510 may vibrate the display panel 300 according to the first sound signal and thus may output the first sound. The second sound generator 520 may vibrate the display panel 300 according to the second sound signal and thus may output the second sound.

[0220] Fig.19 is a flowchart illustrating a sound providing method of a display apparatus according to an exemplary embodiment.

[0221] In addition to actions S203 and S205, Fig.19 In the embodiment shown in FIG. 1 , actions S201, S202, S204, and S206 are similar to Fig.10 Actions S101, S102, S104, and S106 in the illustrated embodiment are substantially the same. Therefore, they may be omitted (e.g., may not be repeated). Fig.19Description of actions S201, S202, S204 and S206 in the embodiment shown in .

[0222] refer to Fig.19 , the phase shifter 750 makes Fig. 20 The phase of each of the fundamental tone FT1 of the first sound and the first harmonic tone HT11, the second harmonic tone HT12, the third harmonic tone HT13 and the fourth harmonic tone HT14 shown in FIG. 1 is shifted to produce Fig.21 , and the first, second, third, and fourth harmonic tones HT21, HT22, HT23, and HT24 of the second sound shown in . The phase shifter 750 can shift the phase of the fundamental tone FT1 of the first sound to produce the fundamental tone FT2 of the second sound, thereby obtaining an effect of amplifying the fundamental tone FT1 of the first sound by the fundamental tone FT2 of the second sound. In addition, the phase shifter 750 can shift the phase of each of the first and third harmonic tones HT11 and HT13 of the first sound to produce the first and third harmonic tones HT21 and HT23 of the second sound, thereby obtaining an effect of amplifying the first and third harmonic tones HT11 and HT13 of the first sound, each having a frequency that is an even multiple of the frequency of the fundamental tone FT1 of the first sound, by the first and third harmonic tones HT21 and HT23 of the second sound. In addition, the phase shifter 750 can shift the phase of each of the second harmonic tone HT12 and the fourth harmonic tone HT14 of the first sound to generate the second harmonic tone HT22 and the fourth harmonic tone HT24 of the second sound, thereby obtaining an effect in which the second harmonic tone HT12 and the fourth harmonic tone HT14 of the first sound, each having an odd multiple of the frequency of the fundamental tone FT1 of the first sound, are offset by the second harmonic tone HT22 and the fourth harmonic tone HT24 of the second sound ( Fig.19 S203).

[0223] For example, when the frequency of the fundamental tone FT1 of the first sound is 300 Hz, the frequency of the first harmonic tone HT11 of the first sound having a frequency twice the frequency of the fundamental tone FT1 of the first sound may be 600 Hz, and the frequency of the second harmonic tone HT12 of the first sound having a frequency three times the frequency of the fundamental tone FT1 of the first sound may be 900 Hz. In addition, the frequency of the third harmonic tone HT13 of the first sound having a frequency four times the frequency of the fundamental tone FT1 of the first sound may be 1200 Hz, and the frequency of the fourth harmonic tone HT14 of the first sound having a frequency five times the frequency of the fundamental tone FT1 of the first sound may be 1500 Hz.

[0224] The phase shifter 750 modulates the first sound data and outputs the second sound data. The first sound includes a fundamental tone FT1 and harmonic tones HT11, HT12, HT13, and HT14, and the second sound includes a fundamental tone FT2 and harmonic tones HT21, HT22, HT23, and HT24. The first sound data includes information about the frequency and sound pressure level or amplitude of the fundamental tone of the first sound, and information about the frequency and sound pressure level or amplitude of the harmonic tones of the first sound. The second sound data includes information about the frequency and sound pressure level or amplitude of the fundamental tone of the second sound, and information about the frequency and sound pressure level or amplitude of the harmonic tones of the second sound.

[0225] Since the phase shifter 750 shifts the phase of the fundamental tone FT1 of the first sound to generate the fundamental tone FT2 of the second sound and shifts the phase of each of the second harmonic tone HT12 and the fourth harmonic tone HT14 of the first sound to generate the second harmonic tone HT22 and the fourth harmonic tone HT24 of the second sound, the description is the same as that already described. Fig.10 Those described in action S103 are substantially the same, so a description thereof may be omitted (eg, may not be repeated).

[0226] In order to make the sound pressure level of the first harmonic tone HT31 of the third sound higher than (or greater than) the sound pressure level of the first harmonic tone HT11 of the first sound, the time period during which the positive amplitude region of the first harmonic tone HT11 of the first sound overlaps with the positive amplitude region of the first harmonic tone HT21 of the second sound can be 1 / 4 of the period of the first harmonic tone HT11 of the first sound or more. To this end, the difference between the phase of the first harmonic tone HT11 of the first sound and the phase of the first harmonic tone HT21 of the second sound can be in the range from -90° to 90°. In this case, the amplitude of the first harmonic tone HT31 of the third sound can be greater than (or higher than) the amplitude of the first harmonic tone HT11 of the first sound and the amplitude of the first harmonic tone HT21 of the second sound.

[0227] In order to make the sound pressure level of the third harmonic tone HT33 of the third sound higher than (or greater than) the sound pressure level of the third harmonic tone HT13 of the first sound, the time period during which the positive amplitude region of the third harmonic tone HT13 of the first sound overlaps with the positive amplitude region of the third harmonic tone HT23 of the second sound can be 1 / 4 of the period of the third harmonic tone HT13 of the first sound or more. To this end, the difference between the phase of the third harmonic tone HT13 of the first sound and the phase of the third harmonic tone HT23 of the second sound can be in the range from -90° to 90°. In this case, the amplitude of the third harmonic tone HT33 of the third sound can be greater than (or higher than) the amplitude of the third harmonic tone HT13 of the first sound and the amplitude of the third harmonic tone HT23 of the second sound.

[0228] Since the phase shifter 750 shifts each of the fundamental tone and the harmonic tones of the first sound to generate the fundamental tone and the harmonic tones of the second sound, the frequency of the fundamental tone FT1 of the first sound may be substantially the same as the frequency of the fundamental tone FT2 of the second sound. In addition, the frequency of each of the harmonic tones HT11, HT12, HT13, and HT14 of the first sound may be substantially the same as the frequency of each of the harmonic tones HT21, HT22, HT23, and HT24 of the second sound. For example, the frequency of the first harmonic tone HT11 of the first sound may be substantially the same as the frequency of the first harmonic tone HT21 of the second sound. The frequency of the second harmonic tone HT12 of the first sound may be substantially the same as the frequency of the second harmonic tone HT22 of the second sound. The frequency of the third harmonic tone HT13 of the first sound may be substantially the same as the frequency of the third harmonic tone HT23 of the second sound.

[0229] The frequency of the fourth harmonic tone HT14 of the first sound may be substantially the same as the frequency of the fourth harmonic tone HT24 of the second sound.

[0230] The sound pressure level or amplitude of the fundamental tone FT1 of the first sound may be different from the sound pressure level or amplitude of the fundamental tone FT2 of the second sound. The sound pressure level or amplitude of the first harmonic tone HT11 of the first sound may be different from the sound pressure level or amplitude of the first harmonic tone HT21 of the second sound. The sound pressure level or amplitude of the third harmonic tone HT13 of the first sound may be different from the sound pressure level or amplitude of the third harmonic tone HT23 of the second sound.

[0231] When the sound pressure level or amplitude of the second harmonic tone HT12 of the first sound is substantially the same as the sound pressure level or amplitude of the second harmonic tone HT22 of the second sound, the sound pressure level of the second harmonic tone HT32 of the third sound can be minimized or reduced. However, even when the sound pressure level or amplitude of the second harmonic tone HT12 of the first sound is different from the sound pressure level or amplitude of the second harmonic tone HT22 of the second sound, the sound pressure level or amplitude of the second harmonic tone HT32 of the third sound can also be lower than (or smaller than) the sound pressure level or amplitude of the second harmonic tone HT12 of the first sound. Therefore, in some embodiments, the sound pressure level or amplitude of the second harmonic tone HT12 of the first sound may not be substantially the same as the sound pressure level or amplitude of the second harmonic tone HT22 of the second sound. The sound pressure level or amplitude of the fourth harmonic tone HT14 of the first sound may also be substantially the same as or different from the sound pressure level or amplitude of the fourth harmonic tone HT24 of the second sound.

[0232] Meanwhile, in order to obtain an amplification effect of making the sound pressure level of the fundamental tone of the third sound, which is the sum of the first sound and the second sound, higher (or larger) than the sound pressure level of the fundamental tone of the first sound, or to obtain a cancellation effect of making the sound pressure level of at least one of the harmonic tones of the third sound lower (or smaller) than the sound pressure level of at least one of the harmonic tones of the first sound, information about the distance between the first sound generator 510 and the second sound generator 520 is desirable. The phase shifter 750 stores information about the distance between the first sound generator 510 and the second sound generator 520. Therefore, in order to obtain the amplification effect or the cancellation effect, the phase shifter 750 can calculate how much the phase of each of the fundamental tone and the harmonic tones of the first sound should be shifted.

[0233] according to Fig.19 In action S203, due to the phase shifter 750, a cancellation effect of the sound pressure level of the harmonic tones of the first sound each having a different pitch from the basic pitch of the first sound can be obtained, and concurrently (for example, simultaneously) an amplification effect of the sound pressure level of the harmonic tones of the first sound each having the same pitch as the basic pitch of the first sound can be obtained. Therefore, a decrease in the sound quality provided to the user due to the harmonic tones of the first sound each having a different pitch from the basic pitch of the first sound can be prevented or reduced, and high-quality sound can be provided by increasing the sound pressure level of the harmonic tones of the first sound each having the same pitch as the basic pitch of the first sound.

[0234] In addition, the phase shifter 750 shifts the phase of the harmonic tones of the second sound having the same frequency as the fundamental tone of the first sound or at least one harmonic tone. The phase shifter 750 can shift the phase of the harmonic tones of the second sound having the same frequency as the fundamental tone of the first sound, thereby obtaining an effect of amplifying the fundamental tone of the first sound by the harmonic tones of the second sound. In addition, the phase shifter 750 can shift the phase of the harmonic tones of the second sound having an even multiple of the frequency of the fundamental tone of the first sound, thereby obtaining an effect of amplifying the harmonic tones of the first sound having an even multiple of the frequency of the fundamental tone of the first sound by the harmonic tones of the second sound. In addition, the phase shifter 750 can shift the phase of the harmonic tones of the second sound having an odd multiple of the frequency of the fundamental tone of the first sound, thereby obtaining an effect of canceling the harmonic tones of the first sound having an odd multiple of the frequency of the fundamental tone of the first sound by the harmonic tones of the second sound ( Fig.19 S205).

[0235] The phase shifter 750 may shift the phase of the harmonic tone of the second sound having the same frequency as the fundamental tone of the first sound. In order to increase the sound pressure level of the fundamental tone of the first sound, the time period during which the positive amplitude region of the fundamental tone of the first sound overlaps with the positive amplitude region of the harmonic tone of the second sound may be 1 / 4 of the period of the fundamental tone of the first sound or more. In this case, the difference between the phase of the fundamental tone of the first sound and the phase of the harmonic tone of the second sound may be in the range from -90° to 90°.

[0236] The phase shifter 750 may shift the phase of such a harmonic tone of the second sound, the frequency of which is the same as the frequency of the harmonic tone of the first sound having an odd-number multiple frequency of the fundamental tone of the first sound. In order to reduce the sound pressure level of the harmonic tone of the first sound having an odd-number multiple frequency of the fundamental tone of the first sound, the time period during which the positive amplitude region of the harmonic tone of the first sound having an odd-number multiple frequency of the fundamental tone of the first sound overlaps with the negative amplitude region of the harmonic tone of the second sound may be 1 / 4 of the period of the harmonic tone of the first sound having an odd-number multiple frequency of the fundamental tone of the first sound or more. In this case, the difference between the phase of the harmonic tone of the first sound having an odd-number multiple frequency of the fundamental tone of the first sound and the phase of the harmonic tone of the second sound may be less than -90° and greater than 90°.

[0237] The phase shifter 750 may output the first sound data to the first sound driver 340 in the second sound mode, and may output the second sound data to the second sound driver 760 in the second sound mode.

[0238] according to Fig.19 In action S205, due to the phase shifter 750, a canceling effect of the sound pressure level of the harmonic tones of the first sound each having a different pitch from the basic pitch of the first sound can be obtained, and concurrently (for example, simultaneously) an amplifying effect of the sound pressure level of the harmonic tones of the first sound each having the same pitch as the basic pitch of the first sound can be obtained. Therefore, a decrease in the sound quality provided to the user due to the harmonic tones of the first sound each having a different pitch from the basic pitch of the first sound (that is, the harmonic tones have a frequency that is an odd multiple of the frequency of the basic pitch) can be prevented or reduced, and high-quality sound can be provided by increasing the sound pressure level of the harmonic tones of the first sound each having the same pitch as the basic pitch of the first sound (that is, the harmonic tones have a frequency that is an even multiple of the frequency of the basic pitch).

[0239] Fig.23 is a diagram showing an example of an embodiment of the invention being attached to Figure 3 A bottom view of a bracket on the lower surface of a display panel and a main circuit board disposed on the bracket.

[0240] Fig.23 The embodiment shown in Figure 4 The embodiment shown in FIG. 1 differs in that the memory 740 comprises a lookup table instead of the phase shifter 750. Fig.23 In the example, it can be omitted (for example, it can be non-repeated) and Figure 4 The embodiments shown in are basically the same as described above.

[0241] refer to Fig.23 The lookup table receives frequency information of the fundamental tone and harmonic tone of the first sound from the main processor 710 in the first sound mode. The lookup table stores information about the fundamental tone and harmonic tone of the second sound according to the frequency of each of the fundamental tone and harmonic tone of the first sound. The lookup table can output information about the fundamental tone and harmonic tone of the second sound using the frequency of each of the fundamental tone and harmonic tone of the first sound as an input address. The main processor 710 can generate second sound data using the information about the fundamental tone and harmonic tone of the second sound input from the lookup table in the first sound mode, and can output the second sound data to the second sound driver 760.

[0242] according to Fig.23 In the embodiment shown in , due to the lookup table, an amplification effect of making the sound pressure level of the fundamental tone of the third sound, which is the sum of the first sound and the second sound, higher (or larger) than the sound pressure level of the fundamental tone of the first sound can be obtained, and concurrently (for example, simultaneously) a cancellation effect of making the sound pressure level of any one of the harmonic tones of the third sound lower (or smaller) than the sound pressure level of any one of the harmonic tones of the first sound can be obtained. Therefore, a decrease in the sound quality provided to the user due to the harmonic tones of the first sound can be prevented or reduced, and high-quality sound can be provided by increasing the sound pressure level of the fundamental tone of the first sound.

[0243] In addition, according to Fig.23 In the embodiment shown in , when the lookup table is used, the fundamental pitch and the harmonic pitch of the second sound can be determined, and the circuit complexity can be reduced, compared with when the phase shifter 750 is used.

[0244] Fig.24 is a diagram showing an example of an embodiment of the invention being attached to Figure 2 A bottom view of the display panel of the cover window, and Fig.25 is a diagram showing an example of an embodiment of the invention being attached to Figure 3 A bottom view of a bracket on the lower surface of a display panel and a main circuit board arranged on the bracket.

[0245] Fig.24 and Fig.25The embodiment shown in Figure 3 and Figure 4 The embodiment shown in FIG. 6 is different in that the second sound generator 520 is disposed on one surface of the display panel 300 instead of being removed from the bracket 600. Fig.24 and Fig.25 In the example, it can be omitted (for example, it can be non-repeated) and Figure 3 and Figure 4 The embodiments shown in are basically the same as described above.

[0246] refer to Fig.24 and Fig.25 , the second sound generator 520 may be attached to one surface of the display panel 300 using a second adhesive member such as a pressure-sensitive adhesive. Fig.24 As shown in , when the panel lower member 400 is disposed on one surface of the display panel 300 , the second sound generator 520 may be attached to the panel lower member 400 by the second adhesive member.

[0247] The second sound generator 520 may be a piezoelectric element or a piezoelectric actuator that uses a piezoelectric material that contracts and expands according to an applied voltage to vibrate the display panel 300. Fig.24 , the second sound generator 520 is shown to have a rectangular parallelepiped shape, but the shape of the second sound generator 520 is not limited thereto. The first sound generator 510 may be disposed adjacent to the upper side of the display panel 300, and the second sound generator 520 may be disposed adjacent to the lower side of the display panel 300.

[0248] The third connector 317 and the second sound driver 760' may be disposed on one surface of the display circuit board 310. The third connector 317 may include an insertion portion connected to a connection terminal disposed at one end of a second flexible circuit board 580 (eg, a second flexible printed circuit board).

[0249] A connection terminal provided at one end of the second flexible circuit board 580 may be inserted into an insertion portion of the third connector 317. The other end of the second flexible circuit board 580 may be connected to the second sound generator 520. The second flexible circuit board 580 may be a flexible printed circuit board or a flexible printed circuit (FPC).

[0250] When both the first sound generator 510 and the second sound generator 520 are piezoelectric elements or piezoelectric actuators, it is suitable to output the sound of the high frequency band. When the second sound generator 520 is a linear resonance actuator (LRA), the first sound generator 510 outputs the first sound of the high frequency band in the second sound mode, and the second sound generator 520 outputs the second sound of the low frequency band in the second sound mode. On the contrary, when the second sound generator 520 is a piezoelectric element or a piezoelectric actuator, the first sound generator 510 can output the first stereo sound in the second sound mode, and the second sound generator 520 can output the second stereo sound in the second sound mode. That is, the display device 10 can provide stereo sound in the second sound mode.

[0251] Although certain exemplary embodiments and examples have been described herein, other embodiments and modifications will be apparent from this description. Therefore, the inventive concept is not limited to such embodiments, but covers the broader scope of the appended claims and various obvious modifications and equivalent arrangements that will be apparent to those of ordinary skill in the art.

Claims

1. Display equipment, including: Display panel; A first sound generator, located on a first surface of the display panel, the first sound generator being configured to vibrate the display panel to output a first sound; as well as a second sound generator configured to output a second sound, wherein the third sound is the sum of the first sound and the second sound, and the sound pressure level of at least one of the harmonic tones of the third sound is smaller than the sound pressure level of at least one of the harmonic tones of the first sound, wherein the sound pressure level of the fundamental tone of the third sound is greater than the sound pressure level of the fundamental tone of the first sound, The sound pressure level of a first harmonic tone among the harmonic tones of the third sound is smaller than the sound pressure level of the first harmonic tone among the harmonic tones of the first sound.

2. The display device according to claim 1, in, A difference between a phase of the at least one of the harmonic tones of the first sound and a phase of at least one of the harmonic tones of the second sound is less than -90° and greater than 90°.

3. The display device according to claim 2, in, The sound pressure level of the at least one harmonic tone of the first sound is different from the sound pressure level of the at least one harmonic tone of the second sound.

4. The display device according to claim 3, in, A difference between a phase of the fundamental pitch of the first sound and a phase of the fundamental pitch of the second sound is in a range from -90° to 90°.

5. The display device according to claim 4, in, The sound pressure level of the basic tone of the first sound is different from the sound pressure level of the basic tone of the second sound.

6. The display device according to claim 1, The sound pressure level of the second harmonic tone of the third sound is smaller than the sound pressure level of the second harmonic tone of the first sound.

7. The display device according to claim 6, in, a difference between a phase of the first harmonic tone of the first sound and a phase of the first harmonic tone of the second sound is less than -90° and greater than 90°, and A difference between a phase of the second harmonic tone of the first sound and a phase of the second harmonic tone of the second sound is less than -90° and greater than 90°.

8. The display device according to claim 7, in, the sound pressure level of the first harmonic tone of the first sound is different from the sound pressure level of the first harmonic tone of the second sound, and The sound pressure level of the second harmonic tone of the first sound is different from the sound pressure level of the second harmonic tone of the second sound.

9. Display equipment, including: Display panel; A first sound generator, located on a first surface of the display panel, the first sound generator being configured to vibrate the display panel to output a first sound; as well as a second sound generator configured to output a second sound, wherein the third sound is the sum of the first sound and the second sound, and the sound pressure level of at least one of the harmonic tones of the third sound is smaller than the sound pressure level of at least one of the harmonic tones of the first sound, wherein the sound pressure level of the first harmonic tone among the harmonic tones of the third sound is greater than the sound pressure level of the first harmonic tone among the harmonic tones of the first sound, The sound pressure level of the second harmonic tone among the harmonic tones of the third sound is smaller than the sound pressure level of the second harmonic tone among the harmonic tones of the first sound.

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