Display device

Abstract

To provide a display device for achieving an excellent sound output.SOLUTION: A display device comprises: a display section including a flat panel for displaying a video; a plurality of vibrators arranged on a rear surface of the flat panel so as to vibrate the flat panel; and output sections for outputting sound by driving with two right and left cone type speakers. The vibrators include: one vibration element arranged close to the center of the flat panel; a first piezo-element arranged on the left side when facing the display device; and a second piezo-element arranged on the right side when facing the display device. The vibration element, the first piezo-element, and the second piezo-element are arranged to allow a difference between a distance from the vibration element to the left cone type speaker and a distance from the first piezo-element to the left cone type speaker to be within a predetermined range, and also to allow a difference between a distance from the vibration element to the right cone type speaker and a distance from the second piezo-element to the right cone type speaker to be within a predetermined range.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a display device equipped with a flat panel speaker. [Background technology]

[0002] A flat panel speaker has been proposed for a display device such as a television, which is configured with a flat panel and a plurality of vibrators that vibrate the flat panel. The flat panel speaker outputs sound by generating vibrations in the flat panel using the vibrators. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2018 / 123310 Summary of the Invention [Problem to be solved by the invention]

[0004] Flat panel speakers that use an exciter as a vibrator tend to have a low ability to reproduce high-frequency sounds. For small display devices such as smartphones, flat panel speakers using piezoelectric elements have been proposed to compensate for the high-frequency sounds. However, in order to adopt flat panel speakers using piezoelectric elements in large display devices such as televisions, it is necessary to determine where on the flat panel the piezoelectric elements should be placed and in what direction to install them in order to achieve excellent sound output.

[0005] Furthermore, when a flat panel speaker includes a plurality of vibrators, it is necessary to adjust the sounds output from the respective vibrators so that they do not interfere with each other.

[0006] The present disclosure proposes a display device that can solve these problems and achieve excellent audio output. [Means for solving the problem]

[0007] In order to solve the above problems, a display device according to an embodiment of the present disclosure includes a display unit including a flat panel that displays an image, a plurality of vibrators arranged on the rear surface of the flat panel to vibrate the flat panel, and an output unit that outputs sound by driving two left and right cone-type speakers. The vibrators include one vibration element arranged near the center of the flat panel, a first piezoelectric element arranged on the left when facing the display device, and a second piezoelectric element arranged on the right when facing the display device. The vibration element, the first piezoelectric element, and the second piezoelectric element are arranged such that the difference between the distance from the vibration element to the left cone-type speaker and the distance from the first piezoelectric element to the left cone-type speaker is within a predetermined range, and the difference between the distance from the vibration element to the right cone-type speaker and the distance from the second piezoelectric element to the right cone-type speaker is within a predetermined range. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram showing a display device according to an embodiment; [Diagram 2] FIG. 2 is a diagram showing an example of an arrangement of piezoelectric elements. [Diagram 3] 1 is a diagram showing an example of the relationship between the number of inches of a flat panel and the position at which a piezoelectric element is arranged. [Figure 4] FIG. 13 is a diagram showing an example of the orientation in which a piezoelectric element is installed. [Diagram 5] FIG. 13 illustrates an example of an arrangement of additional enclosure tapes. [Figure 6] FIG. 2 is a diagram showing an example of an arrangement of a vibrator and a woofer. [Figure 7] FIG. 4 is a diagram showing an example of the distance between each vibrator and a woofer. [Figure 8] FIG. 1 is a diagram showing a schematic diagram of a situation in which three-channel audio is output. [Figure 9] FIG. 4 is a diagram showing a flow of an audio signal distribution process. [Figure 10]FIG. 2 is a hardware configuration diagram illustrating an example of a computer that realizes the functions of the display device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments will be described in detail with reference to the drawings. In the following embodiments, the same components are designated by the same reference numerals, and duplicated descriptions will be omitted.

[0010] The present disclosure will be described in the following order. 1. Embodiment 1-1. Configuration of the display device according to the embodiment 1-2.Piezo element arrangement 1-3. Layout of each output section 1-4. Output control process according to the embodiment 2. Other embodiments 3. Effects of the Display Device According to the Present Disclosure 4. Hardware Configuration

[0011] (1. EMBODIMENT) (1-1. Configuration of the Display Device According to the Embodiment) 1 shows the configuration of a display device 100 according to an embodiment. The display device 100 includes a display unit including a flat panel that displays images. The display device 100 also includes an output unit that is disposed on the rear surface of the flat panel 150 and drives a plurality of vibrators that vibrate the flat panel 150 and two cone-type speakers to output sound.

[0012] The vibrator includes two piezo elements for high-frequency output and one vibration element (e.g., an exciter) for mid-frequency output. As shown in Fig. 1, the two piezo elements are arranged on the rear surface of the flat panel 150, one on each side of the exciter 200, which is a vibration element, and are arranged above the exciter 200 in the height direction.

[0013] Specifically, the display device 100 has, as multiple vibrators, an exciter 200 which is a vibration element arranged near the center of the flat panel 150, a first piezoelectric element 210 arranged on the left when facing the display device directly, and a second piezoelectric element 220 arranged on the right when facing the display device directly.

[0014] In the display device 100, the two piezoelectric elements mainly output high-frequency sounds. The vibration element mainly outputs mid-frequency sounds. The left woofer 230 and the right woofer 240, which are two cone-type speakers arranged on the left and right, mainly output mid-frequency sounds and low-frequency sounds.

[0015] 1, the left woofer 230 and the right woofer 240 are disposed on the left and right sides of the exciter 200 in the center, and disposed below the flat panel 150. For example, the left woofer 230 is disposed to the left of the center when facing the display device 100, and below the center of the flat panel 150. The right woofer 240 is disposed to the right of the center when facing the display device 100, and below the center of the flat panel 150.

[0016] The flat panel 150 is divided into a first section 300 in which the exciter 200 is arranged, a second section 310 in which the first piezoelectric element 210 is arranged, a third section 320 in which the second piezoelectric element 220 is arranged, and a fourth section 330 in which the left woofer 230 and the right woofer 240 are arranged. The flat panel 150 is divided into sections by, for example, a vibration-damping member called an enclosure tape, which is fixed to the rear surface of the flat panel 150. As an example, the first section 300, the second section 310, and the third section 320 are divided into regions that divide the flat panel 150 in the horizontal direction into approximately one-third each, as shown in FIG. 1.

[0017] As shown in FIG. 1, the display device 100 has vibrators arranged in separate sections, thereby limiting the range in which the flat panel 150 vibrates and preventing unnecessary vibrations from occurring.

[0018] (1-2. Placement of Piezoelectric Elements) Incidentally, in the display device 100, the piezoelectric element, which is mainly responsible for the high-pitched range, is likely to affect the output sound depending on the installation position and the installation direction. This is because, in terms of human hearing, the higher the frequency, the more sensitive the sound localization is, or the higher the frequency is, the more easily it is affected by the rigidity of the vibrating body (flat panel 150 in this disclosure) on which the element is installed. Therefore, in the display device 100, it is desirable to place the piezoelectric element in an optimal position for sound output.

[0019] Specifically, it is desirable that the first piezoelectric element 210 and the second piezoelectric element 220 are arranged in the vibrating section so as to avoid the center in both the horizontal and vertical directions, so as not to generate standing waves. That is, the first piezoelectric element 210 is arranged in the second section 310 so as to avoid the center in both the horizontal and vertical directions. Also, the second piezoelectric element 220 is arranged in the third section 320 so as to avoid the center in both the horizontal and vertical directions.

[0020] FIG. 2 shows an example of the arrangement of the piezoelectric elements. For example, the first piezoelectric element 210 can be installed in the second section 310 at positions (1) to (6) shown in FIG. 2. Of these, the first piezoelectric element 210 is preferably installed at position (2) shown in FIG. 2, for example, based on the vertical spread of sound, the horizontal spread of sound, the difficulty of generating standing waves, and the like. Specifically, the first piezoelectric element 210 is arranged at a horizontal distance from the center of the flat panel 150 of about 68% to 80% of the horizontal distance from the center to the end in the horizontal direction. Also, the first piezoelectric element 210 is arranged at a height of about 70% to 81% of the height from the lower end to the upper end of the flat panel 150 of 100%. In addition, in any of the positions (1) to (6) shown in FIG. 2, the first piezoelectric element 210 and the second piezoelectric element 220 are installed at a position higher than the exciter 200 in the height direction.

[0021] 3 shows an example of the relationship between the number of inches of the flat panel 150 and the positions at which the piezoelectric elements are disposed. Specifically, FIG. 3 shows the relationship between the number of inches of the flat panel 150 and the positions at which the first piezoelectric element 210 and the second piezoelectric element 220 are desirably disposed (position (2) shown in FIG. 2). As shown in FIG. 3, for example, when the flat panel 150 is 55 inches in size, the first piezoelectric element 210 and the second piezoelectric element 220 are desirably disposed at a horizontal distance of about 80% from the center of the flat panel 150 toward the outside. Also, the first piezoelectric element 210 and the second piezoelectric element 220 are desirably disposed at a height direction of about 81% from the bottom end of the flat panel 150.

[0022] Next, the direction in which the piezoelectric element is installed will be described with reference to FIG. 4. FIG. 4 is a diagram showing an example of the direction in which the piezoelectric element is installed. The piezoelectric element according to the present disclosure has a substantially rectangular shape including a base portion and a vibration portion. For example, as shown in FIG. 4, the first piezoelectric element 210 has a vibration portion 212 that vibrates in response to a voltage, and a base portion 214 that controls the voltage. The vibration portion 212 and the base portion 214 are connected by a connector.

[0023] When a piezoelectric element is installed in the display device 100 according to the present disclosure, it is desirable that the piezoelectric element is arranged so that its longitudinal direction is horizontal so as to be parallel to the longitudinal direction of the flat panel 150, and that the vibration unit is arranged close to the outside of the flat panel 150. This orientation is determined in consideration of the vertical and horizontal spread of the sound output based on the vibration of the piezoelectric element.

[0024] Furthermore, the display device 100 may include an additional enclosure tape 216 to narrow the section in which the piezoelectric elements are arranged. FIG. 5 shows an example of the arrangement of the additional enclosure tape 216. For example, the display device 100 includes an additional enclosure tape 216 (second vibration-damping member) at a lower portion a predetermined distance away from the positions of the two piezoelectric elements, for further narrowing each of the second section 310 and the third section 320. For example, the display device 100 includes the additional enclosure tape 216 at a location about 80 to 100 mm away from the positions of the two piezoelectric elements, parallel to the longitudinal direction of the flat panel 150. In this way, the display device 100 can suppress the generation of unnecessary standing waves by limiting the area of ​​the flat panel 150 that is vibrated by the piezoelectric elements, and can output sound suitable for the rigidity of the flat panel 150.

[0025] (1-3. Layout of each output unit) Furthermore, the display device 100 may optimize not only the grounding position and orientation of the piezoelectric element, but also the relative positions of the piezoelectric element, the exciter 200, and the left and right woofers. In other words, by optimizing the positions of the elements that configure the output section, the display device 100 can improve the composite frequency characteristics of the output sound, thereby improving the sense of positioning and sound quality.

[0026] In the present disclosure, display device 100 has a three-channel audio output structure, with center channel audio output by exciter 200 and left and right channel audio output by piezoelectric elements. In this case, the center channel audio is output by a combination of exciter 200 and left and right woofers. The left channel audio is output by a combination of first piezoelectric element 210 and left woofer 230. The right channel audio is output by a combination of second piezoelectric element 220 and right woofer 240.

[0027] That is, the left and right woofers output both the center channel and either the left or right channel. The center channel and the left and right channel sounds are subjected to processing such as delay to correct the difference at the listening point, but since there is only one woofer output, if the difference becomes too large, problems with hearing may occur, such as the sound sounding out of sync at the listening point. For this reason, the display device 100 according to the present disclosure reduces discomfort for the person listening to the sound by devising the positional relationship of each output unit, namely the exciter 200, the piezoelectric element, and the woofer. The positional relationship of each output unit will be described below with reference to FIG. 6.

[0028] An example of the arrangement of the vibration exciters and woofers is shown in Fig. 6. As shown in Fig. 6, the exciter 200 and the first piezoelectric element 210 are arranged so that the difference between the distance 260 from the exciter 200 to the left woofer 230 (line (a) shown in Fig. 6) and the distance 262 from the first piezoelectric element 210 to the left woofer 230 (line (b) shown in Fig. 6) is within a predetermined range.

[0029] Similarly, exciter 200 and second piezoelectric element 220 are arranged so that the difference between the distance from exciter 200 to right woofer 240 and the distance from second piezoelectric element 220 to right woofer 240 falls within a predetermined range.

[0030] Specifically, it is desirable to position the first piezoelectric element 210 at a position such that the difference between the distance 260 from the exciter 200 to the left woofer 230 and the distance 262 from the first piezoelectric element 210 to the left woofer 230 is within 10% of the length of the distance 260 (or the length of the distance 262).

[0031] Similarly, it is desirable to position the second piezoelectric element 220 at a position such that the difference between the distance from the exciter 200 to the right woofer 240 and the distance from the second piezoelectric element 220 to the right woofer 240 is within 10% of the distance from the second piezoelectric element 220 to the right woofer 240.

[0032] An example of the distance between each vibrator and the woofer is shown in Fig. 7. As shown in Fig. 7, for example, when flat panel 150 is 55 inches in size, it is desirable that the distance from first piezo element 210 to left woofer 230 is 570 mm, and the distance from exciter 200 to left woofer 230 is 530 mm. As shown in this example, the difference between the respective distances is within 10% of the distance from first piezo element 210 to left woofer 230 or the distance from exciter 200 to left woofer 230.

[0033] In other words, by making the distance between the woofer and the exciter 200 and the distance between the woofer and the piezoelectric element approximately the same, the display device 100 can reduce the lag in the output sound and achieve sound output that does not sound strange to the ear.

[0034] (1-4. Output control process according to the embodiment) Next, a description will be given of the process in which the display device 100 adjusts the sound output from the flat panel 150. As shown in Fig. 1, the display device 100 has a control unit 130, and adjusts the sound output from the output unit by signal processing or the like executed by the control unit 130.

[0035] The control unit 130 is realized by, for example, a central processing unit (CPU), a micro processing unit (MPU), a graphics processing unit (GPU), or the like executing a program (for example, a signal processing program according to the present disclosure) stored inside the display device 100 using a random access memory (RAM) or the like as a working area. The control unit 130 is a controller, and may be realized by, for example, an integrated circuit such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA).

[0036] The control unit 130 has an output control unit 131 that controls output units such as a vibrator and a woofer to output sound. The output control unit 131 controls the sound signal output by the center channel (exciter 200) and the sound signals output by the left and right channels (first piezo element 210 and second piezo element 220). In other words, the display device 100 is an audio output device having three audio output channels. In the display device 100, the center channel signal of the three-channel output is output by the exciter 200 and the left and right woofers. In the display device 100, the LR (left and right) channel signals of the three-channel output are output by the left and right piezo elements and the left and right woofers.

[0037] In such a three-channel audio output mechanism, it is required to adjust the output value and frequency band of the output signal using signal processing. This is because, compared with conventional two-channel playback, in three-channel playback, the output of the center channel needs to be higher than that of the left and right channels. That is, in conventional two-channel playback, the sounds of the left and right channels are mixed at the viewing point (for example, in front of the display device 100). As a result, the viewer hears a sound that is louder than the sound output from a single channel. However, in a three-channel audio output mechanism, since the center channel is responsible for the sound that should be localized in the center of the screen, the center channel needs to output a sound that is louder than the signals output by the left and right channels in the past. For example, when the viewing point is at the same distance from each of the left and right channels, the sound at the viewing point sounds about 3 decibels louder than the sound emitted from each channel, so the center channel needs to output a sound that is 3 decibels louder than the sound output by the left and right channels.

[0038] Here, since the vibration elements such as the exciter 200 have a limit to the high-frequency range that they can output, the high-frequency range is usually electrically amplified when output. However, as the output value of the vibration element increases, the output limit gradually increases from the high-frequency range, resulting in a frequency characteristic in which the high-frequency range is attenuated. For this reason, if an attempt is made to output a sound louder than before from the center channel, there is a risk that a sound that does not have accurate frequency characteristics, especially in the high-frequency range, will be output.

[0039] Therefore, the output control unit 131 distributes the signal output from the center channel to the left and right channels in accordance with the frequency characteristics of the center channel, in which the output gradually attenuates as the output value of the center channel increases. This allows the output control unit 131 to flatten the frequency characteristics of the center channel even at high output values.

[0040] This point will be described with reference to Fig. 8. Fig. 8 is a diagram showing a schematic diagram of a situation in which three-channel audio is output. As shown in Fig. 8, when the output volume is low, that is, within the volume range in which the center channel can comfortably output high-pitched sounds, display device 100 outputs a signal that should be output from the center channel only from the center channel.

[0041] On the other hand, when the output volume gradually increases, i.e., when the center channel reaches its output limit in the treble range, the display device 100 distributes the signal to be output from the center channel to the left and right channels, and outputs a center channel signal from the left and right channels as well.

[0042] As a result, the output control section 131 can flatten the frequency characteristics of the center channel even at a high output value, and can perform appropriate output.

[0043] This point will be described with reference to Fig. 9. Fig. 9 is a diagram showing the flow of audio signal distribution processing.

[0044] 9, when the display device 100 acquires an audio signal to be reproduced, the display device 100 first distributes the audio signal so that it can be output on three channels. Specifically, the display device 100 separates the center channel signal and the left and right channel signals into separate paths.

[0045] Furthermore, as shown in FIG. 9, the display device 100 separates the path of the center channel signal into a signal to be output from the center speaker and an audio signal to be distributed to the left and right channels (corresponding to "Distribute Cch signal" shown in FIG. 9).

[0046] Then, the output control unit 131 of the display device 100 executes a predetermined signal processing on the signal distributed to the left and right channels. Specifically, the display device 100 varies the amount of the center channel signal to be distributed and the frequency band of the sound output to the left and right channels according to the volume (gain). That is, the distribution amount (output value) and frequency bandwidth of the center channel signal output to the left and right channels change in conjunction with the output value (volume, etc.).

[0047] For example, the output control unit 131 distributes the center channel signal to the left and right channels using a high-pass filter that changes the frequency band that it passes depending on the output value.

[0048] That is, output control section 131 controls the signal output from the piezoelectric element and the signal output from exciter 200. Furthermore, output control section 131 distributes a portion of the signal output from exciter 200 to the output to the piezoelectric element according to the output value of the signal output from exciter 200.

[0049] Specifically, output control section 131 changes the frequency band of the signal output from exciter 200 that is to be distributed to the output to the piezoelectric element, according to the output value of the signal output from exciter 200. For example, as the output value of the signal output from exciter 200 becomes higher, output control section 131 widens the frequency band of the signal output from exciter 200 that is to be distributed to the output to the piezoelectric element.

[0050] Such control is explained by a graph showing the behavior of a dynamic high-pass filter ("Dynamic HPF" in FIG. 9) shown in FIG. 9. That is, the dynamic high-pass filter adjusts the gain ("Gain setting" in FIG. 9), which is the output value of the center channel signal, and gradually widens the frequency band of the sound that is transmitted as the output value increases. This indicates that as the output value increases, the frequency at which the output limit of the exciter 200 gradually reaches spreads from the high band to the low band. In this way, the output control unit 131 can realize an audio output that is free of distortion and has a well-balanced frequency overall by passing the sound through a dynamic high-pass filter that changes the frequency band and distribution amount of the sound that is transmitted according to the output value.

[0051] That is, the display device 100 reproduces a balanced signal by fusing the center channel with the left and right channels by mixing the center channel signal with the left and right channels while changing the distribution amount and frequency band according to the output value. In this way, the display device 100 realizes optimal audio output by compensating for frequency bands and signals that cannot be fully output by the center channel alone with the left and right channels.

[0052] (2. Other embodiments) The processing according to each of the above-described embodiments may be implemented in various different forms other than the above-described embodiments.

[0053] Furthermore, among the processes described in the above embodiments, all or part of the processes described as being performed automatically can be performed manually, or all or part of the processes described as being performed manually can be performed automatically by a known method. In addition, the information including the processing procedures, specific names, various data and parameters shown in the above documents and drawings can be changed arbitrarily unless otherwise specified. For example, the various information shown in each drawing is not limited to the illustrated information.

[0054] In addition, each component of each device shown in the figure is a functional concept, and does not necessarily have to be physically configured as shown in the figure. In other words, the specific form of distribution and integration of each device is not limited to that shown in the figure, and all or part of them can be functionally or physically distributed and integrated in any unit according to various loads, usage conditions, etc.

[0055] Furthermore, the above-described embodiments and modifications can be appropriately combined as long as the processing contents are not contradictory.

[0056] Furthermore, the effects described in this specification are merely examples and are not limiting, and other effects may also be obtained.

[0057] (3. Effects of the Display Device According to the Present Disclosure) As described above, the display device according to the present disclosure (display device 100 in the embodiment) includes a display unit including a flat panel that displays an image, an output unit that is disposed on the rear surface of the flat panel and outputs sound by driving a plurality of vibrators that vibrate the flat panel, and an output control unit (output control unit 131 in the embodiment) that controls the output unit to output sound. The vibrators include two piezoelectric elements (first piezoelectric element 210 and second piezoelectric element 220 in the embodiment) for high-frequency output, and one vibration element (exciter 200 in the embodiment) for mid-frequency output. The output control unit controls the signal output from the piezoelectric element and the signal output from the vibration element, respectively, and distributes a part of the signal output from the vibration element to the output to the piezoelectric element according to the output value of the signal output from the vibration element.

[0058] Furthermore, the output control section changes the frequency band of the signal that is distributed to the output of the piezoelectric element out of the signal output from the vibration element, according to the output value of the signal output from the vibration element.

[0059] Furthermore, the output control section widens the frequency band of the signal that is distributed to the piezoelectric element from the signal output from the vibration element as the output value of the signal output from the vibration element becomes higher.

[0060] In this way, the display device according to the present disclosure outputs three-channel sound by distributing the signal output from the vibration element to the piezo element. At this time, the display device dynamically distributes the signal output from the vibration element to the piezo element according to the output value, thereby outputting sound that compensates for the high frequency band that the vibration element has difficulty outputting. In addition, the display device dynamically compensates for the output characteristic of the vibration element, in which the high frequency band gradually reaches its limit as the output value increases, by expanding the frequency band in conjunction with the output value, thereby making it possible to maintain an appropriate frequency band of the sound reproduced across the three channels.

[0061] The two piezoelectric elements of the display device are disposed on the rear surface of the flat panel, one on each side of the vibration element, and located above the vibration element in the height direction.

[0062] The display device also includes a vibration-damping member fixed to the rear surface of the flat panel, which divides the display device into a first section in which the vibration element is arranged, a second section in which the first of the two piezoelectric elements that is arranged on the left when facing the display device is arranged, and a third section in which the second of the two piezoelectric elements that is arranged on the right when facing the display device is arranged.

[0063] The first piezoelectric element is disposed in the second section so as to avoid the center in both the horizontal and vertical directions, and the second piezoelectric element is disposed in the third section so as to avoid the center in both the horizontal and vertical directions.

[0064] In addition, the two piezoelectric elements have a roughly rectangular shape including a base portion and a vibration portion, and are arranged with their longitudinal direction oriented horizontally so as to be parallel to the longitudinal direction of the flat panel, and the vibration portion is arranged close to the outside of the flat panel.

[0065] The display device further includes a second vibration-damping member, located below and at a predetermined distance from the positions of the two piezoelectric elements, for further narrowing each of the second and third sections.

[0066] In this way, the display device according to the present disclosure is placed in a position where the sound output from the piezoelectric element is most spread out. In addition, the display device adds a second vibration-damping member to narrow the section in which the piezoelectric element is installed, thereby increasing the rigidity of the vibrating flat panel and adjusting it so that clearer sound is output. This allows the display device to further improve the quality of the sound output.

[0067] The vibrator for the display device includes one vibration element disposed near the center of the flat panel, a first piezoelectric element disposed on the left when facing the display device, and a second piezoelectric element disposed on the right when facing the display device. The vibration element, the first piezoelectric element, and the second piezoelectric element are disposed so that the difference between the distance from the vibration element to the left cone-type speaker (left woofer 230 in the embodiment) and the distance from the first piezoelectric element to the left cone-type speaker is within a predetermined range, and the difference between the distance from the vibration element to the right cone-type speaker (right woofer 240 in the embodiment) and the distance from the second piezoelectric element to the right cone-type speaker is within a predetermined range.

[0068] The first piezoelectric element is disposed at a position where the difference between the distance from the vibration element to the left cone-type speaker and the distance from the first piezoelectric element to the left cone-type speaker is within 10% of the distance from the first piezoelectric element to the left cone-type speaker. The second piezoelectric element is disposed at a position where the difference between the distance from the vibration element to the right cone-type speaker and the distance from the second piezoelectric element to the right cone-type speaker is within 10% of the distance from the second piezoelectric element to the right cone-type speaker.

[0069] Moreover, the first piezoelectric element and the second piezoelectric element are disposed on the rear surface of the flat panel, above the vibration element.

[0070] The left cone speaker is positioned to the left of the center when facing the display device and below the center of the flat panel, and the right cone speaker is positioned to the right of the center when facing the display device and below the center of the flat panel.

[0071] In this way, the display device according to the present disclosure can reduce the deviation of the output sound and realize a natural sound output by making the distance between the woofer and the exciter and the distance between the woofer and the piezoelectric element substantially the same. In other words, the display device can improve the composite frequency characteristics of the sounds from the piezoelectric element, exciter, and woofer speakers, thereby improving the sense of positioning and sound quality.

[0072] (4. Hardware Configuration) The information device such as the display device 100 according to the embodiment described above is realized by a computer 1000 having a configuration as shown in Fig. 10, for example. The display device 100 according to the embodiment will be described below as an example. Fig. 10 is a hardware configuration diagram showing an example of a computer 1000 that realizes the functions of the display device 100. The computer 1000 has a CPU 1100, a RAM 1200, a ROM (Read Only Memory) 1300, a HDD (Hard Disk Drive) 1400, a communication interface 1500, and an input / output interface 1600. Each unit of the computer 1000 is connected by a bus 1050.

[0073] The CPU 1100 operates and controls each unit based on programs stored in the ROM 1300 or the HDD 1400. For example, the CPU 1100 loads the programs stored in the ROM 1300 or the HDD 1400 into the RAM 1200 and executes processes corresponding to the various programs.

[0074] The ROM 1300 stores boot programs such as a basic input output system (BIOS) executed by the CPU 1100 when the computer 1000 is started, and programs that depend on the hardware of the computer 1000.

[0075] HDD 1400 is a computer-readable recording medium that non-temporarily records programs executed by CPU 1100 and data used by such programs. Specifically, HDD 1400 is a recording medium that records an information processing program according to the present disclosure, which is an example of program data 1450.

[0076] The communication interface 1500 is an interface for connecting the computer 1000 to an external network 1550 (e.g., the Internet). For example, the CPU 1100 receives data from other devices and transmits data generated by the CPU 1100 to other devices via the communication interface 1500.

[0077] The input / output interface 1600 is an interface for connecting the input / output device 1650 and the computer 1000. For example, the CPU 1100 receives data from an input device such as a keyboard or a mouse via the input / output interface 1600. The CPU 1100 also transmits data to an output device such as a display, a speaker, or a printer via the input / output interface 1600. The input / output interface 1600 may also function as a media interface for reading a program or the like recorded on a predetermined recording medium. The medium may be, for example, an optical recording medium such as a DVD (Digital Versatile Disc) or a PD (Phase change rewritable Disk), a magneto-optical recording medium such as an MO (Magneto-Optical disk), a tape medium, a magnetic recording medium, or a semiconductor memory.

[0078] For example, when the computer 1000 functions as the display device 100 according to the embodiment, the CPU 1100 of the computer 1000 executes a signal processing program loaded on the RAM 1200 to realize functions of the control unit 130, etc. Also, data such as the signal processing program according to the present disclosure is stored in the HDD 1400. Note that the CPU 1100 reads and executes the program data 1450 from the HDD 1400, but as another example, the CPU 1100 may obtain these programs from other devices via an external network 1550.

[0079] The present technology can also be configured as follows. (1) a display unit including a flat panel for displaying images; an output unit that is disposed on a rear surface of the flat panel and outputs sound by driving a plurality of vibrators that vibrate the flat panel; an output control unit that controls the output unit to output audio; Equipped with The vibrator is It includes two piezo elements for high-frequency output and one vibration element for mid-frequency output, The output control unit is A signal output from the piezoelectric element and a signal output from the vibration element are respectively controlled, and a part of the signal output from the vibration element is distributed to the piezoelectric element according to an output value of the signal output from the vibration element. Display device. (2) The output control unit is changing a frequency band of a signal to be distributed to the piezoelectric element among the signals output from the vibration element according to an output value of the signal output from the vibration element; The display device according to (1) above. (3) The output control unit is As the output value of the signal output from the vibration element becomes higher, the frequency band of the signal output from the vibration element to be distributed to the output of the piezoelectric element is widened. The display device according to (2) above. (4) a display unit including a flat panel for displaying images; an output section disposed on the rear surface of the flat panel and configured to output sound by driving a plurality of vibrators that vibrate the flat panel, the output section including, as the plurality of vibrators, two piezoelectric elements for high-frequency output and one vibration element for mid-frequency output; A computer having Controlling the output unit to output a sound; A signal output from the piezoelectric element and a signal output from the vibration element are respectively controlled, and a part of the signal output from the vibration element is distributed to the piezoelectric element according to an output value of the signal output from the vibration element; A signal processing method comprising: (5) a display unit including a flat panel for displaying images; an output section disposed on the rear surface of the flat panel and configured to output sound by driving a plurality of vibrators that vibrate the flat panel, the output section including, as the plurality of vibrators, two piezoelectric elements for high-frequency output and one vibration element for mid-frequency output; A computer having an output control unit that controls the output unit to output sound; A signal processing program for causing the device to function as The output control unit is A signal output from the piezoelectric element and a signal output from the vibration element are respectively controlled, and a part of the signal output from the vibration element is distributed to the piezoelectric element according to an output value of the signal output from the vibration element. Signal processing program. (6) a display unit including a flat panel for displaying images; an output unit that is disposed on a rear surface of the flat panel and that outputs sound by driving a plurality of vibrators that vibrate the flat panel and two cone-type speakers; The vibrator is It includes two piezo elements for high-frequency output and one vibration element for mid-frequency output, The two piezoelectric elements are: On the rear surface of the flat panel, one each is disposed on the left and right sides of the vibration element as a center, and is disposed above the vibration element in a height direction. Display device. (7) a first section in which the vibration element is disposed, a second section in which the first piezoelectric element of the two piezoelectric elements disposed on the left when facing the display device, and a third section in which the second piezoelectric element of the two piezoelectric elements disposed on the right when facing the display device, the member including a vibration damping member fixed to the rear surface of the flat panel; The display device according to (6) above. (8) The first piezoelectric element is In the second section, the second section is arranged so as to avoid the center in both the horizontal and vertical directions, The second piezoelectric element is In the third section, the center is avoided in both the horizontal and vertical directions. The display device according to (7) above. (9) The two piezoelectric elements are: A substantially rectangular shape including a base portion and a vibration portion, the longitudinal direction of which is arranged horizontally so as to be parallel to the longitudinal direction of the flat panel, and the vibration portion is arranged so as to be close to the outer side of the flat panel. The display device according to any one of (6) to (8) above. (10) A second vibration damping member is provided at a lower portion located a predetermined distance away from the positions of the two piezoelectric elements, which further narrows each of the second section and the third section. The display device according to (7) or (8). (11) a display unit including a flat panel for displaying images; A display device including: a plurality of vibrators disposed on a rear surface of the flat panel for vibrating the flat panel; and an output unit for outputting sound by driving two cone-type speakers on the left and right; The vibrator is The display device includes one vibration element disposed near the center of the flat panel, a first piezoelectric element disposed on the left when facing the display device, and a second piezoelectric element disposed on the right when facing the display device, The vibration element, the first piezoelectric element, and the second piezoelectric element are The piezoelectric element is disposed so that a difference between a distance from the vibration element to the left cone-type speaker and a distance from the first piezoelectric element to the left cone-type speaker is within a predetermined range, and a difference between a distance from the vibration element to the right cone-type speaker and a distance from the second piezoelectric element to the right cone-type speaker is within a predetermined range. Display device. (12) The first piezoelectric element is the vibration element is disposed at a position where a difference between a distance from the vibration element to the left cone-type speaker and a distance from the first piezoelectric element to the left cone-type speaker is within 10% of a distance from the first piezoelectric element to the left cone-type speaker, The second piezoelectric element is The vibration element is disposed at a position where a difference between a distance from the vibration element to the right cone-type speaker and a distance from the second piezoelectric element to the right cone-type speaker is within 10% of a distance from the second piezoelectric element to the right cone-type speaker. The display device according to (11) above. (13) The first piezoelectric element and the second piezoelectric element are On the rear surface of the flat panel, the vibration element is disposed above the vibration element. The display device according to (11) or (12). (14) The cone-type speaker on the left is The display device is disposed to the left of the center when facing the display device and below the center of the flat panel, The cone-type speaker on the right is When facing the display device, the display device is disposed to the right of the center and below the center of the flat panel. The display device according to any one of (11) to (13) above. [Explanation of symbols]

[0080] 100 display device 130 Control section 131 Output control section 150 Flat Panel 200 Exciter 210 First Piezo Element 212 Vibration section 214 Base Section 216 Enclosure Tape 220 Second Piezo Element 230 Left woofer 240 Right woofer 300 Section 1 310 Section 2 320 Section 3 330 Section 4

Claims

1. a display unit including a flat panel for displaying images; A display device including: a plurality of vibrators disposed on a rear surface of the flat panel for vibrating the flat panel; and an output unit for outputting sound by driving two cone-type speakers on the left and right; The vibrator is The display device includes one vibration element disposed near the center of the flat panel, a first piezoelectric element disposed on the left side when facing the display device, and a second piezoelectric element disposed on the right side when facing the display device, The vibration element, the first piezoelectric element, and the second piezoelectric element are The piezoelectric element is disposed so that a difference between a distance from the vibration element to the left cone-type speaker and a distance from the first piezoelectric element to the left cone-type speaker is within a predetermined range, and a difference between a distance from the vibration element to the right cone-type speaker and a distance from the second piezoelectric element to the right cone-type speaker is within a predetermined range. Display device.

2. The first piezoelectric element is the vibration element is disposed at a position where a difference between a distance from the vibration element to the left cone-type speaker and a distance from the first piezoelectric element to the left cone-type speaker is within 10% of a distance from the first piezoelectric element to the left cone-type speaker, The second piezoelectric element is The vibration element is disposed at a position where a difference between a distance from the vibration element to the right cone-type speaker and a distance from the second piezoelectric element to the right cone-type speaker is within 10% of a distance from the second piezoelectric element to the right cone-type speaker. The display device according to claim 1 .

3. The first piezoelectric element and the second piezoelectric element are On the rear surface of the flat panel, the vibration element is disposed above the vibration element. The display device according to claim 2 .

4. The cone-type speaker on the left is The display device is disposed to the left of the center when facing the display device and below the center of the flat panel, The cone-type speaker on the right is When facing the display device, the display device is disposed to the right of the center and below the center of the flat panel. The display device according to claim 3 .

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