JP7767480B2 - Display device and information processing device - Google Patents

Description

The present invention relates to a display device and an information processing device.

Patent Document 1 discloses a display device that includes a display panel and an acoustic generator supported on the back surface of the display panel. The display device in Patent Document 1 is able to emit sound from the front surface of the display panel by driving the acoustic generator to vibrate the display panel. Patent Document 1 also discloses a structure in which a partition is arranged to surround the acoustic generator in order to improve sound quality.

Korean Patent Publication No. 10-2018-0131248

There is a demand for improving sound quality using methods other than the method of installing a physical structure as described in Patent Document 1.

The present invention was made in consideration of the above-mentioned problems, and aims to improve the sound quality of display devices that emit sound from the display panel.

One aspect of the present invention provides a display device comprising: a plurality of electroacoustic conversion elements including a first electroacoustic conversion element and a second electroacoustic conversion element; a display panel to which the plurality of electroacoustic conversion elements are connected; a memory unit that stores correction information calculated based on a first signal and a second signal obtained by receiving, with the second electroacoustic conversion element, sound emitted from the first electroacoustic conversion element based on the first signal; and a correction unit that, when sound is emitted from the plurality of electroacoustic conversion elements, corrects the sound emitted from the second electroacoustic conversion element based on the correction information.

According to another aspect of the present invention, there is provided an information processing device comprising: a control unit that controls a plurality of electroacoustic conversion elements, each including a first electroacoustic conversion element and a second electroacoustic conversion element, provided on a display panel, the control unit controlling the plurality of electroacoustic conversion elements so that the first electroacoustic conversion element emits a sound based on a first signal and the second electroacoustic conversion element receives the sound to obtain a second signal; and a calculation unit that calculates correction information for correcting the sound emitted from the second electroacoustic conversion element based on the first signal and the second signal.

The present invention aims to improve the sound quality of a display device that emits sound from a display panel.

1 is a block diagram showing a schematic configuration of a display device according to a first embodiment. FIG. 2 is a plan view showing the arrangement of piezoelectric elements according to the first embodiment. FIG. 2 is a block diagram showing a hardware configuration of a first control device according to the first embodiment. FIG. 2 is a functional block diagram of a first control device according to the first embodiment. 5 is a flowchart showing a process for generating a lookup table for resonance correction according to the first embodiment. 10 is a table showing a specific example of the relationship between a critical band and a transfer function. 10 is a table showing specific examples of correction functions calculated for each critical band. 4 is a flowchart illustrating a resonance correction process according to the first embodiment. FIG. 10 is a displacement distribution diagram showing an example of vibration distribution of a display panel. FIG. 10 is a displacement distribution diagram schematically illustrating the principle of resonance correction. FIG. 10 is a plan view showing the arrangement of piezoelectric elements according to a second embodiment.

Embodiments of the present invention will be described in detail below with reference to the drawings. Elements with common functions throughout the drawings will be given the same reference numerals, and duplicate descriptions may be omitted or simplified.

[First embodiment]
1 is a schematic diagram of a display device 1 according to a first embodiment. The display device 1 of this embodiment can be used, for example, as an image output device for a computer, a television receiver, a smartphone, a game console, etc., but is not particularly limited thereto.

As shown in FIG. 1, the display device 1 includes a piezoelectric element array 10, a display panel 20, a connection member 30, a first control device 40, a second control device 50, a data drive circuit 60, and a gate drive circuit 70. The display device 1 displays an image on the display panel 20 based on input RGB data, etc., and produces sound based on input audio signals, etc.

The display panel 20 includes a plurality of pixels P arranged in a plurality of rows and a plurality of columns. The display device 1 may be, for example, an OLED display that uses organic light-emitting diodes (OLEDs) as the light-emitting elements of the pixels P. If the display device 1 is capable of displaying color images, the pixels P may be sub-pixels that display one of a plurality of colors (e.g., RGB) that make up the color image.

The piezoelectric element array 10 includes a plurality of piezoelectric elements 11. The plurality of piezoelectric elements 11 are arranged in a matrix on the surface facing the image display surface of the display panel 20 (the back surface of the display panel 20).

The piezoelectric element 11 is an electroacoustic transducer that converts electricity and sound mutually using the piezoelectric effect (normal piezoelectric effect) and the inverse piezoelectric effect. The piezoelectric element 11 can be, for example, a bimorph, unimorph, or other element that undergoes bending displacement in response to voltage. When a voltage based on an input audio signal is applied, the piezoelectric element 11 undergoes displacement due to the inverse piezoelectric effect. Because the input audio signal is typically an AC voltage, the piezoelectric element 11 vibrates in response to the input audio signal, converting the voltage into sound. Furthermore, when the piezoelectric element 11 vibrates in response to external sound, the voltage of the electrodes of the piezoelectric element 11 changes in accordance with the vibration frequency due to the piezoelectric effect, converting the sound into AC voltage. In this way, the piezoelectric element 11 functions as both a speaker and a microphone. The state in which it functions as a speaker and the state in which it functions as a microphone can be switched under control of the first control device 40.

The connecting member 30 is a member that connects each of the multiple piezoelectric elements 11 to the display panel 20. The connecting member 30 is made of an elastic material. Typically, the connecting member 30 is made of a material such as rubber that has a lower elastic modulus than the piezoelectric elements 11 and the display panel 20. A portion of the piezoelectric elements 11 and a portion of the display panel 20 are connected by the connecting member 30. This transmits vibrations of the piezoelectric elements 11 to the display panel 20, causing the display panel 20 to emit sound based on the input audio signal.

The host system 2 is a device or a system including multiple devices that controls the display device 1 by supplying image signals (e.g., RGB data), audio signals, and timing signals (vertical synchronization signal, horizontal synchronization signal, data enable signal, etc.). The host system 2 may be, for example, a television system, a set-top box, a navigation system, an optical disc player, a computer, a home theater system, a video telephone system, etc. The display device 1 and the host system 2 may be integrated into one device or may be separate devices.

The first control device 40 supplies voltage to each of the multiple piezoelectric elements 11 based on the audio signal and timing signal input from the host system 2. The first control device 40 also performs the process of supplying a voltage based on a reference signal to the piezoelectric elements 11 and the process of measuring the voltage of the electrodes of the piezoelectric elements 11 to obtain a signal based on the sound received by the piezoelectric elements 11.

The second control device 50 controls the data drive circuit 60 and gate drive circuit 70 based on image data and timing signals input from the host system 2. The data drive circuit 60 supplies data voltages and the like to the pixels P via drive lines 61 arranged for each column of the pixels P. The gate drive circuit 70 supplies control signals to the pixels P via drive lines 71 arranged for each row of the pixels P. Note that each of the drive lines 61 and 71 may be composed of multiple wirings.

Each of the first control device 40, second control device 50, data drive circuit 60, and gate drive circuit 70 may be configured as one or more semiconductor integrated circuits. Furthermore, some or all of the first control device 40, second control device 50, data drive circuit 60, and gate drive circuit 70 may be integrated into a single semiconductor integrated circuit.

Figure 2 is a plan view showing the arrangement of piezoelectric elements 11 according to the first embodiment. Figure 2 is a plan view of the display panel 20 as seen from the back side. The rectangular outer frame of the display panel 20 in Figure 2 schematically shows the external shape of the display panel 20. The piezoelectric element array 10 is connected near the center of the display panel 20. In Figure 2, 36 piezoelectric elements 11 arranged in 6 rows and 6 columns are shown in the piezoelectric element array 10, but this is an example and the number of piezoelectric elements 11 can be adjusted as appropriate.

The piezoelectric element array 10 is divided into region R1, which includes 16 piezoelectric elements 11 (first electroacoustic conversion elements) arranged in 4 rows and 4 columns near the center, and region R2, which includes 20 piezoelectric elements 11 (second electroacoustic conversion elements) arranged in one row around the periphery of region R1. The differences in the uses of the piezoelectric elements 11 in region R1 and the piezoelectric elements 11 in region R2 will be described later.

Figure 3 is a block diagram showing the hardware configuration of the first control device 40 according to the first embodiment. The first control device 40 has a processor 401, memory 402, an interface 403, and a piezoelectric element drive circuit 404. The first control device 40 functions as an information processing device that processes information necessary to control the piezoelectric element array 10. The various components within the first control device 40 are interconnected via buses, wiring, drive devices, etc. (not shown).

Memory 402 is a storage medium including ROM (Read Only Memory), RAM (Random Access Memory), flash memory, etc. Memory 402 stores programs and data for implementing information processing by processor 401, and stores data input from the outside. Processor 401 is an integrated circuit that performs information processing and control based on programs stored in memory 402. Interface 403 is a circuit that inputs and outputs signals between first control device 40 and external devices, and may include an amplifier circuit, an analog-to-digital conversion circuit, a digital-to-analog conversion circuit, etc.

The piezoelectric element drive circuit 404 includes a circuit that supplies voltage to drive each of the multiple piezoelectric elements 11 based on the input audio signal. The piezoelectric element drive circuit 404 also includes a circuit that has the function of acquiring an audio signal from the voltage generated by the vibration of the multiple piezoelectric elements 11. These two circuits can be switched using a switch or the like.

In Figure 3, the various components that make up the first control device 40 are shown as an integrated device, but some of these functions may be provided by external devices. For example, the piezoelectric element drive circuit 404 may be an external device separate from the components that make up the computer functions, including the processor 401, etc.

Figure 4 is a functional block diagram of the first control device 40 according to the first embodiment. The first control device 40 has a control unit 411, a calculation unit 412, a correction unit 413, a storage unit 414, and a drive unit 415. The processor 401 performs predetermined processing based on a program stored in the memory 402, thereby realizing the functions of the control unit 411, calculation unit 412, and correction unit 413. The processor 401 controls the memory 402 to store and read data, thereby realizing the function of the storage unit 414. The processor 401 controls the interface 403 and the piezoelectric element drive circuit 404 to input and output voltages to and from the multiple piezoelectric elements 11, thereby realizing the function of the drive unit 415. The specific processing performed by each functional block will be described later.

When the vibrations of the piezoelectric element array 10 are transmitted to the display panel 20, causing the display panel 20 to vibrate, resonance can cause the vibrations within the surface of the display panel 20 to become uneven, resulting in a deterioration in sound quality. In this embodiment, the first control device 40 has the function of correcting the deterioration in sound quality caused by resonance.

Figure 5 is a flowchart showing the process of generating a lookup table for resonance correction according to the first embodiment. The process in Figure 5 is performed in advance before a user uses the display device 1 to view content. Typically, the process in Figure 5 is performed before shipping the display device 1, or during calibration when changing the settings of the display device 1, etc.

In step S11, the control unit 411 applies a voltage based on the test signal to the piezoelectric elements 11 in region R1. This causes the piezoelectric elements 11 in region R1 to emit a test sound. The characteristics of the test signal used to generate this test sound (signal waveform, intensity, frequency spectrum, etc.) are prepared in advance and stored in the memory unit 414.

The display panel 20 emits sound within the audible range. Therefore, it is desirable that the test sound contain frequency components within the audible range so that the transfer characteristics within the audible range can be calculated. Furthermore, it is desirable that the test sound be white noise at frequencies within the audible range (e.g., 20 Hz to 20 kHz). In this case, the test sound uniformly contains frequency components within the audible range emitted by the display device 1. Therefore, a white noise test sound is suitable for calculating the frequency dependence of the transfer function described below with high accuracy.

The test sound may also be pink noise (1/f noise) at frequencies within the audible range. In this case, the energy of each octave of the test sound is uniform. Therefore, pink noise test sounds are suitable when calculating transfer functions at uneven intervals, such as logarithmic intervals, taking into account auditory characteristics, etc.

In step S12, the control unit 411 acquires a voltage from the piezoelectric element 11 in region R2, thereby acquiring a signal based on the test sound received by the piezoelectric element 11 in region R2. Hereinafter, the test signal used to generate the test sound emitted from the piezoelectric element 11 in region R1 may be referred to as the "first signal," and the signal based on the test sound received by the piezoelectric element 11 in region R2 may be referred to as the "second signal." The second signal differs from the first signal due to changes in waveform caused by the transfer characteristics when the test sound is transferred from region R1 to region R2. The second signal is stored in the memory unit 414.

In step S13, the calculation unit 412 calculates a transfer function based on the first signal prepared in advance and the second signal acquired in step S12. In step S14, the calculation unit 412 calculates the inverse function of the transfer function for each critical band as a correction function. In step S15, the storage unit 414 stores the correction functions obtained for each critical band as a lookup table.

The processing from step S13 to step S15 will be explained in more detail with reference to Figures 6 and 7. Figure 6 is a table showing specific examples of the relationship between critical bands and transfer functions. Figure 7 is a table showing specific examples of correction functions calculated for each critical band.

The human inner ear is structured so that different areas detect vibrations for each frequency band. For this reason, it is believed that the human hearing system has the ability to perceive sounds collectively for each frequency band. For example, when two sounds of similar frequencies reach the ear, it is known that a phenomenon called masking occurs, in which one sound becomes difficult to perceive. The frequency band that is perceived collectively is called the critical band of hearing.

Considering the characteristics of human hearing, the resolution between two sounds within a critical band is low, so performing correction in a frequency band finer than the critical band does not contribute much to improving accuracy. Therefore, it is more efficient to perform the correction process in this embodiment for each critical band.

As shown in Fig. 6, in this embodiment, transfer functions are defined separately for each critical band (1 to N) (G ₁ to G _N ) for the calculation process of the correction function. The frequencies (100 Hz, 200 Hz, 300 Hz, ...) written in parentheses as arguments of the transfer functions in Fig. 6 indicate the center frequencies of the corresponding critical bands. The scale used to divide these critical bands is called the Bark scale. However, scales other than those shown in Fig. 6, such as the Mel scale or the ERB scale (Equivalent Rectangular Bandwidth scale), may also be used.

As shown in FIG. 7 , the correction functions (F ₁ to F _N ) are calculated as separate data associated with each critical band (1 to N). That is, the same correction function is used within the same critical band. This reduces the amount of data to be prepared for correction. Furthermore, reducing the amount of data for correction may result in a deterioration in correction accuracy. However, in this embodiment, the frequency intervals for which the same correction function is used are determined taking into account the critical bands based on auditory characteristics, thereby reducing the deterioration in correction accuracy. Furthermore, since the correction functions are stored in advance in the storage unit 414 as a lookup table, there is no need to calculate the inverse function during correction, which reduces the amount of calculation required for correction and speeds up processing.

Figure 8 is a flowchart showing the resonance correction process according to the first embodiment. The process in Figure 8 is performed when an audio signal is input to the display device 1 and sound is emitted from the display device 1, i.e., when a user watches or listens to content using the display device 1.

In step S21, the correction unit 413 reads the lookup table stored in the memory unit 414 in step S15.

In step S22, the correction unit 413 decomposes the input audio signal into multiple audio signals in the same frequency range as the critical band of the lookup table. This processing can be achieved, for example, by digital signal processing, such as applying a band-pass filter to the audio signal, with one critical band as its passband.

In step S23, the correction unit 413 applies the correction function for the corresponding critical band to the audio signal decomposed into each critical band to generate a corrected signal for each critical band. In step S24, the correction unit 413 combines the corrected signals for each critical band to generate a corrected signal for the entire band.

In step S25, the drive unit 415 applies a voltage to the piezoelectric elements 11 in the piezoelectric element array 10, controlling them to emit sound. Here, the drive unit 415 applies a voltage based on the original audio signal to the piezoelectric elements 11 in region R1, and a voltage based on the corrected signal to the piezoelectric elements 11 in region R2. As a result, the piezoelectric elements 11 in region R1 emit sound based on the original audio signal, and the piezoelectric elements 11 in region R2 emit sound based on the corrected signal. As a result, the display panel 20 emits a sound that is a mixture of sound based on the original audio signal and sound based on the corrected signal.

The effects obtained by performing the above-described correction will be explained with reference to Figures 9 and 10. Figure 9 is a displacement distribution diagram showing an example of vibration distribution on the display panel 20. Figure 9 shows, using gray shading and grid line deformation, the two-dimensional distribution of displacement on the display panel 20 that occurs when a sound of a certain frequency is emitted from the piezoelectric elements 11 in the piezoelectric element array 10. A vibration distribution such as that shown in Figure 9 can be obtained, for example, by simulation using the finite element method or a vibration distribution meter such as a scanning laser vibrometer.

As shown in Figure 9, the vibrations on the surface of the display panel 20 are not uniform, with numerous peaks and dips occurring locally. This is thought to be due to the interference between the sound emitted by the piezoelectric element array 10 and the sound reflected from the edges of the display panel 20, causing resonance at specific locations on the surface of the display panel 20. This uneven vibration distribution can be a factor in degrading sound quality.

Figures 10(a), 10(b), and 10(c) are displacement distribution diagrams that schematically illustrate the principle of resonance correction. The vertical axis of Figures 10(a), 10(b), and 10(c) represents displacement, and the horizontal axis represents position in one direction (e.g., the horizontal direction) on the surface of the display panel 20. R1 and R2 in the diagrams indicate positions corresponding to regions R1 and R2.

Figure 10(a) shows an example of the displacement distribution when sound based on the original audio signal is emitted from the piezoelectric element 11 in region R1. As described in the explanation of Figure 9, undulating displacement occurs not only within region R1 where the piezoelectric element 11 emitting the sound is located, but also outside region R1 where the piezoelectric element 11 is located, and peaks and dips indicating resonance are present.

Figure 10(b) shows an example of the displacement distribution when sound based on the corrected signal is emitted from the piezoelectric element 11 in region R2. It can be seen that the vibration spreads from region R2, which is the vibration source, at its center.

Figure 10(c) is an example of the displacement distribution when sound based on the original audio signal is emitted from the piezoelectric element 11 in region R1 and sound based on the corrected signal is emitted from the piezoelectric element 11 in region R2. In other words, it is a displacement distribution that is a superposition of Figure 10(a) and Figure 10(b). It can be seen that the peaks and dips indicating resonance outside region R1 are canceled out.

The correction signal is calculated from the inverse function of the transfer function when sound is transmitted from region R1 to region R2. Therefore, when sound based on this correction signal is emitted from region R2, the sound component transmitted from region R1 to region R2 is canceled in region R2. This results in the cancellation of resonance as shown in Figure 10(c) above.

As described above, in this embodiment, the test sound emitted from the piezoelectric elements 11 in region R1 is received by the piezoelectric elements 11 in region R2 and is acquired, and correction information is generated using this. Then, when sound is emitted from the piezoelectric element array 10, the sound emitted from the piezoelectric elements 11 in region R2 is corrected based on the correction information. This makes it possible to correct at least part of the effects of resonance in the display panel 20, thereby improving sound quality.

As shown in Figure 2, it is desirable that region R2 be located further outward than region R1. This is because when sound spreads outward from region R1, the sound emitted in region R2 is superimposed, improving the effectiveness of resonance compensation. Furthermore, to further enhance this effect, it is more desirable that region R2 be located so as to surround region R1, as shown in Figure 2.

Second Embodiment
In this embodiment, a modified example of the arrangement of the piezoelectric elements 11 according to the first embodiment will be described. The basic configuration of the display device 1, the structure of the piezoelectric elements 11, the algorithm for resonance correction, etc. are the same as those in the first embodiment, and therefore will not be described again.

Figure 11 is a plan view showing the arrangement of piezoelectric elements 11 according to the first embodiment. In this embodiment, two piezoelectric element arrays 10 are provided on the display panel 20. The structure of each of the two piezoelectric element arrays 10 is the same as in the first embodiment. The two piezoelectric element arrays 10 are arranged side by side in the long side direction of the display panel 20. Two-channel audio signals of a stereophonic sound source are input to each of the two piezoelectric element arrays 10. This allows the display device 1 to function as a stereo speaker capable of reproducing stereophonic sound sources.

The number of piezoelectric element arrays 10 provided on the display panel 20 may be three or more. By providing three or more piezoelectric element arrays 10, it becomes possible to reproduce a sound source with three or more channels, i.e., a so-called surround sound source.

In this embodiment, as in the first embodiment, sound quality can be improved, and by providing multiple piezoelectric element arrays 10 (electroacoustic conversion element arrays), it is possible to accommodate multiple channel sound sources.

[Other embodiments]
The above-described embodiments merely exemplify some aspects to which the present invention can be applied, and the technical scope of the present invention should not be interpreted as being limited by the above-described embodiments. Furthermore, the present invention can be implemented in various aspects by making appropriate modifications and variations without departing from the spirit of the present invention. For example, it should be understood that embodiments in which part of the configuration of any embodiment is added to or replaced with part of the configuration of another embodiment are also embodiments to which the present invention can be applied.

In the above-described embodiment, the device configuration of the display device 1 and the like is merely an example and is not limited to that shown in the drawings. For example, the display device 1 may be a liquid crystal display, a CRT display, or the like, rather than an OLED display. However, since it is desirable for the display device 1 to be able to efficiently transmit vibrations from the piezoelectric element 11 to the display panel 20, it is particularly desirable for it to be an OLED display with few cavities.

Furthermore, while the above-described embodiment uses a piezoelectric element 11 as an example of an electroacoustic conversion element, this is not limiting. For example, the piezoelectric element 11 may be replaced with a magnet-type electroacoustic conversion element using a magnet and coil. However, in a configuration in which an electroacoustic conversion element is provided on the display panel 20, as in this embodiment, it is often necessary to achieve both a low profile and high sound pressure, so a configuration using a piezoelectric element 11 that can achieve both is particularly desirable.

Each embodiment also includes a processing method in which a program that operates the device of the above-described embodiments to realize the functions described in the above-described embodiments is recorded on a storage medium, and the program recorded on the storage medium is read as code and executed on a computer. In other words, each embodiment also includes a non-transitory computer-readable storage medium. Furthermore, each embodiment also includes not only the storage medium on which the above-described program is recorded, but also the program itself. Furthermore, one or more components included in the above-described embodiments may be circuits such as an ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array) configured to realize the functions of each component.

Furthermore, the scope of each embodiment is not limited to programs recorded on a storage medium that execute processing by themselves, but also includes programs that execute processing by operating on an OS (Operating System) in cooperation with other software and expansion board functions.

1 Display device 11 Piezoelectric element 20 Display panel 40 First control device 411 Control unit 412 Calculation unit 413 Correction unit 414 Storage unit 415 Driving unit

Claims (23)

a display panel including a first region and a second region surrounding the first region;
a first electroacoustic transducer configured to vibrate the first region;
a second electroacoustic transducer configured to vibrate the second region;
a driver for controlling the first electroacoustic transducer and the second electroacoustic transducer,
the first electroacoustic transducer and the second electroacoustic transducer generate different sounds from each other by the driving unit;
The second electroacoustic transducer element acquires the sound emitted by the first electroacoustic transducer element. each of the first electroacoustic transducer and the second electroacoustic transducer includes a plurality of piezoelectric elements;
The sound generating device according to claim 1 , wherein the number of the piezoelectric elements included in the second electroacoustic conversion element is different from the number of the piezoelectric elements included in the first electroacoustic conversion element. The sound generating device of claim 2, wherein the first electroacoustic transducer element includes more piezoelectric elements than the second electroacoustic transducer element. The sound generating device described in claim 2, wherein the plurality of piezoelectric elements included in the first electroacoustic conversion element and the second electroacoustic conversion element are arranged in a matrix on the display panel. The sound generating device described in any one of claims 2 to 4, further comprising a connecting member between each of the plurality of piezoelectric elements and the display panel. The sound generating device of claim 5, wherein a portion of each of the plurality of piezoelectric elements and a portion of the display panel are connected by the connecting member. The sound generating device of claim 5, wherein the connecting member is made of an elastic material. The sound generating device of claim 5, wherein the connecting member has a modulus of elasticity smaller than that of the plurality of piezoelectric elements and the display panel. The sound generating device of claim 5, wherein the connecting member includes a rubber material. The sound generating device described in any one of claims 2 to 9, wherein the plurality of piezoelectric elements are configured to undergo bending displacement in response to a bimorph or unimorph voltage. The sound generating device described in any one of claims 1 to 10, wherein the driving unit applies a first signal to the first electroacoustic conversion element and applies a second signal different from the first signal to the second electroacoustic conversion element. The sound generating device of claim 11, wherein the driver generates the first signal based on an original audio signal and generates the second signal based on the first signal. The drive unit is
a storage unit that stores correction information calculated based on a predetermined signal and a third signal obtained by acquiring, with the second electroacoustic conversion element, a sound emitted from the first electroacoustic conversion element based on the predetermined signal;
The sound generating device according to claim 11 , further comprising: a correction unit that corrects the sound emitted from the second electroacoustic conversion element based on the correction information. The sound generating device of claim 13, wherein the correction information includes data associated with the frequency of the sound emitted from the second electroacoustic conversion element. The sound generating device of claim 14, wherein the correction information is stored in the memory unit as a lookup table consisting of multiple frequency bands and multiple pieces of data associated with the multiple frequency bands. the correction information includes data based on an inverse function of a transfer function when the predetermined signal is used as an input and the third signal is used as an output.
16. The sound generating device according to any one of claims 13 to 15. The sound generating device according to claim 13 , wherein when sounds are generated from the first and second electroacoustic conversion elements, the first signal is not corrected based on the correction information. The sound generating device described in any one of claims 1 to 17, wherein the second electroacoustic conversion element is switchable between a state in which it functions as a speaker and a state in which it functions as a microphone in response to external control. 18. The sound generating device according to claim 13 , wherein the predetermined signal is a signal containing frequency components within an audible range. 18. The sound generating device according to any one of claims 13 to 17 , wherein the predetermined signal is white noise or pink noise at a frequency within the audible range. An acoustic generating device as described in any one of claims 11, 12, and 17, further comprising a control unit that controls the first electroacoustic conversion element and the second electroacoustic conversion element so that sound based on the first signal is emitted from the first electroacoustic conversion element and sound based on the first signal is received by the second electroacoustic conversion element. The sound generating device described in any one of claims 1 to 21, wherein the display panel includes organic light-emitting diodes (OLEDs). a plurality of electroacoustic transducer arrays connected to the display panel;
The sound generating device according to claim 1 , wherein each of the plurality of electroacoustic transducers includes the first electroacoustic transducer and the second electroacoustic transducer.