Display device and signal processing method

Abstract

The display device includes: a display unit including a liquid crystal panel; a vibrator attached to a reverse side of a front surface of the liquid crystal panel and driven to vibrate the liquid crystal panel; and an output control unit performing control so as to output sound from the liquid crystal panel by driving the vibrator within a range exceeding a predetermined frequency based on the information related to the liquid crystal panel.

Description

Technical Field

[0001] The present disclosure relates to a display device used as a flat panel speaker and a signal processing method. Background Art

[0002] In display devices such as televisions, flat panel speakers including a flat panel and an exciter for vibrating the flat panel have been proposed. The flat panel speakers generate vibrations in the flat panel by the exciter, thereby outputting sound from the panel.

[0003] For example, a technique is known in which a glass structure that can be used as a light guide plate of a liquid crystal display is vibrated so that the glass structure functions as a diaphragm of a speaker or a microphone.

[0004] Reference List

[0005] Patent Literature

[0006] Patent Document 1: WO 2018 / 181622 A Summary of the invention

[0007] Technical issues

[0008] According to the prior art, the light guide plate can be used as a loudspeaker with good acoustic performance.

[0009] However, the prior art only vibrates the light guide plate, and does not vibrate the liquid crystal cell at a spatially separated position. That is, in the prior art, since the air layer is inserted in the sound transmission portion, the sound output to the liquid crystal panel side is attenuated, and there is a risk that sufficient sound cannot be output to the viewer / listener on the liquid crystal cell side.

[0010] However, when the liquid crystal panel itself attempts to vibrate by excitation, the liquid crystal may swing due to the excitation force, which may affect the screen display. Therefore, with regard to the excitation of the liquid crystal panel, it is necessary to excite the liquid crystal panel to a degree that can ensure sufficient sound pressure and to control it so as not to affect the screen display.

[0011] The present disclosure solves these problems and proposes a display device and a signal processing method capable of achieving sound output without causing image blur while eliminating insufficient sound pressure.

[0012] Solution to the problem

[0013] In order to solve the above-mentioned problems, a display device according to one embodiment of the present disclosure includes: a display unit, including a liquid crystal panel; an exciter, which is bonded to the opposite side of the surface of the liquid crystal panel and is driven to vibrate the liquid crystal panel; and an output control unit, which is configured to control the driving of the exciter within a range exceeding a predetermined frequency based on information about the liquid crystal panel to output sound from the liquid crystal panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a diagram showing an example of a display device according to an embodiment.

[0015] Figure 2 is a cross-sectional view of a display unit according to an embodiment.

[0016] Figure 3 is a diagram showing an example of a moire display when a liquid crystal panel is excited.

[0017] Figure 4 A diagram for explaining the moire phenomenon of a liquid crystal panel.

[0018] Figure 5 2 is a diagram for explaining a control process of an excitation frequency according to an embodiment.

[0019] Figure 6 is a view showing a speaker arrangement example of a display device according to an embodiment.

[0020] Figure 7 is a diagram showing a configuration example of a display device according to an embodiment.

[0021] Figure 8 is a block diagram showing an example of sound output according to an embodiment.

[0022] Fig. 9 is a block diagram showing another example of sound output according to an embodiment.

[0023] Fig.10 is a diagram ( 1 ) showing a configuration of a display device according to a modification example.

[0024] Fig.11 2 is a diagram showing a configuration of a display device according to a modification example.

[0025] Fig.12 3 is a diagram showing a configuration of a display device according to a modification example.

[0026] Fig.13 is a diagram ( 4 ) showing a configuration of a display device according to a modification example.

[0027] Fig.14 is a diagram ( 5 ) showing a configuration of a display device according to a modification example.

[0028] Fig.15 is a diagram ( 6 ) showing the configuration of a display device according to a modification example.

[0029] Fig.16 is a hardware configuration diagram showing an embodiment of a computer that realizes the function of a display device. DETAILED DESCRIPTION

[0030] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. In addition, in each of the following embodiments, the same reference numerals are given to the same parts and repeated descriptions are omitted.

[0031] The present disclosure will be described according to the following item order.

[0032] 1. Implementation Method

[0033] 1-1. Overview of Display Device According to Embodiment

[0034] 1-2. LCD panel excitation problem

[0035] 1-3. Example of control process according to embodiment

[0036] 1-4. Overview of Control Processing According to Embodiment

[0037] 1-5. Configuration of Display Device According to Embodiment

[0038] 1-6. Variation of display device configuration

[0039] 2. Other implementation methods

[0040] 3. Effects of the display device according to the present disclosure

[0041] 4. Hardware Configuration

[0042] (1-1. Overview of Display Device According to Embodiment)

[0043] Figure 1 2 is a diagram showing an example of a display device 100 according to an embodiment. The display device 100 includes a display unit 200 that displays an image. The display unit 200 is, for example, a display including a liquid crystal panel.

[0044] The display device 100 according to the embodiment is a so-called stereoscopic display, and is a display device capable of stereoscopically displaying virtual content in real space. That is, the display device 100 is a so-called naked-eye stereoscopic display that can be viewed in stereo without the user wearing special glasses or the like. In an embodiment, the display unit 200 is an inclined screen tilted at a predetermined angle relative to the horizontal plane. For example, the display unit 200 displays the virtual content perceived by the user as a stereoscopic image by fusing the viewpoint images that appear in the left and right eyes of the user. Specifically, the stereoscopic display detects the user's line of sight and displays the image in stereoscopic form based on the detected line of sight. Therefore, the user can perceive the virtual object as a realistic display, as if the virtual object existed at that point.

[0045] In the case of performing such a stereoscopic display process, the distance between the display device 100 and the user is shorter than that in a normal video display such as a television. Therefore, the user can more easily specify the position of the sound output unit (i.e., speaker) of the display device 100 than in a normal viewing / listening state. At this time, as a provider of content reproduced by the display device 100, it is desirable to make the user perceive as if the sound is actually emitted from the position corresponding to the stereoscopic display object.

[0046] However, in the display mode according to the embodiment, since the positions of the user and the display device 100 are close, a slight movement of the user's face causes a large angle change, and the phantom positioning by the arranged speakers is easily collapsed. That is, when the speakers are arranged outside the screen of the display device 100, the output sound is hardly concentrated in the screen.

[0047] Therefore, the display device 100 includes an exciter 300 on a metal plate part 250 on the back side of the display unit 200 (i.e., on the back side of the liquid crystal panel), and outputs sound by exciting the display unit 200. The exciter 300 is a vibration element capable of converting power changes into an exciting force. For example, the exciter 300 is a piezoelectric element or a dynamic vibration exciter. When high-frequency output is mainly used as in the present embodiment, for example, a piezoelectric element suitable for high-frequency sound output can be used as the exciter 300.

[0048] That is, the display device 100 includes the exciter 300 on the back side of the display unit 200, and excites the display unit 200 itself to make the display unit 200 function as a speaker. As a result, the display device 100 realizes audio output with a sense of reality located in the object to be displayed.

[0049] Will see Figure 2 The arrangement of the vibration exciter 300 is described. Figure 2 2 is a cross-sectional view of a display unit 200 according to an embodiment. In this embodiment, the display unit 200 is an edge-type liquid crystal display. In an edge-type liquid crystal display, the entire thickness can be reduced by providing a light source 260 such as a light emitting diode (LED) on the peripheral portion of the screen.

[0050] The display unit 200 is configured by stacking a liquid crystal display (LCD) unit 210, a diffuser 220, a light guide plate 230, a reflective sheet 240, and a metal plate member 250 in order from the user side (i.e., the screen side) as a viewer / listener. Then, the exciter 300 is arranged on the metal plate member 250 as the back side of the screen. The light source 260 illuminates the light guide plate 230 from the peripheral portion of the screen. It should be noted that in the case where the display device 100 is a stereoscopic display, the display unit 200 may include a lens array such as a double convex lens or a parallax barrier layer. For example, the lens array and the parallax barrier layer are provided on the LCD unit 210, and control the light beam emitted from the LCD unit 210 to enter the user's eyes.

[0051] according to Figure 2 With the configuration shown, the excitation force of the exciter 300 is transmitted to the LCD unit 210 without passing through an air layer, etc. Therefore, the display device 100 can drive the display unit 200 as a speaker capable of outputting sufficient sound pressure.

[0052] (1-2. LCD panel excitation problem)

[0053] However, when Figure 2 There are problems to be solved when the configuration shown excites the liquid crystal panel. That is, when the liquid crystal panel itself attempts to vibrate by the exciter 300, the liquid crystal may swing by the excitation force, which may affect the screen display.

[0054] Figure 3 Shows a state where the screen is wavy due to excitation. Figure 3 is a diagram showing an example of a ripple display when the liquid crystal panel 400 is excited. As described above, when the liquid crystal panel 400 is simply excited, a display such as ripples is generated at a certain distance around the exciter due to the influence of the resonance frequency.

[0055] Reference Figure 4 Describe this. Figure 4 A diagram for explaining the moire phenomenon of a liquid crystal panel. Figure 4 Corrugations of the front surface 410 and the rear surface 420 in the liquid crystal panel 400 are shown.

[0056] When the liquid crystal panel 400 is excited, the excitation force is transmitted from the excitation point to the liquid crystal panel, so that the front surface 410 and the rear surface 420 are wavy. Figure 4 The thickness d shown in φ varies depending on the position of the liquid crystal panel 400. Here, as an example, the amount of transmitted light I of the liquid crystal panel (LCD) is expressed by the following formula (1).

[0057]

[0058] As shown in the above formula (1), the light amount I of the transmitted light depends on the thickness d. That is, when the amount of change in the thickness d increases, the amount of transmitted light differs for each position of the liquid crystal panel, and as in Figure 3 The phenomenon shown in FIG. 1 is that the image appears wavy.

[0059] However, when an air layer or the like is provided so that the liquid crystal panel is not directly excited, there is a possibility that sound output with sufficient sound pressure cannot be achieved as described above.

[0060] (1-3. Example of control process according to embodiment)

[0061] Therefore, the display device 100 according to the present embodiment enables the display unit 200 to be directly excited while suppressing the ripples of the screen by some methods disclosed in this specification. As an example, the display device 100 controls the frequency of the excitation shaker 300 to suppress the ripples of the screen.

[0062] Reference Figure 5 Describe this. Figure 5 2 is a diagram for explaining a control process of an excitation frequency according to an embodiment.

[0063] Figure 5 A graph 500 illustrating the relationship between the display influence (eg, the change in the amount of transmitted light) and the frequency when the display unit 200 is actually excited by the exciter 300 is shown. Figure 5 "f" shown in φ represents a frequency. It should be noted that the resonance frequency varies based on the area, weight, material, etc. of the display unit 200.

[0064] For example, the display device 100 detects the frequency that affects the display of the display unit 200 by actually exciting the display unit 200 to be excited. At the time of detection, in order to match the actual use state of the display device 100, it is desirable to set the excitation point to the actual attachment position, and the method of attaching the exciter 300 is also the same as the actual use state. In addition, at the time of detection, it is desirable that the excitation force applied to the exciter 300 matches the actual use. However, since the excitation force varies in actual use, the excitation force is set in consideration of this uncertain factor. In addition, it is desirable to perform detection in multiple environments using multiple different display units 200.

[0065] Using this detection, the display device 100 detects the maximum value of the resonance frequency having a large display influence. Figure 5 In the embodiment of FIG. 1 , it is assumed that the display device 100 detects “f7” as the maximum value of the resonance frequency having a large display influence. In this embodiment, it is assumed that the maximum value of the resonance frequency “f7” is “1000 Hz”.

[0066] In this case, the display device 100 sets a frequency band having a frequency higher than twice the highest frequency affecting the panel as an excitable region. In this embodiment, the display device 100 sets a frequency band of "f8 = 2000 Hz" exceeding twice the maximum value "f7" of the resonant frequency as an excitable region. Note that such numerical values ​​are merely embodiments, and the resonant frequencies of the panels do not have to be multiplied, and there is a possibility of mixing various frequencies.

[0067] As described above, the display device 100 drives the exciter 300 within a range exceeding a predetermined frequency (in this embodiment, a frequency corresponding to "f8") determined in advance based on information on the display unit 200, thereby performing control to output sound from the display unit 200. Therefore, the display device 100 can directly excite the display unit 200 (liquid crystal panel) without affecting the screen display, so that sound output that does not cause image blur can be achieved while eliminating insufficient sound pressure.

[0068] (1-4. Overview of Control Processing According to Embodiment)

[0069] Here, we will refer to Figure 6 2 and subsequent drawings describe configuration examples in the case where the display device 100 actually outputs sound. Figure 6 is a view showing a speaker arrangement example of the display device 100 according to an embodiment.

[0070] like Figure 6 As shown, the display device 100 may include, for example, a side speaker 310 in addition to the exciter 300 in order to achieve a wide reproduction frequency while enhancing the localization sense of the sound image. For example, the side speaker 310 is a slit-type speaker incorporated in a housing at the left and right (LR) ends of the display device 100. Note that the side speaker 310 is not limited to a slit-type speaker and may have any form, such as a general cone speaker including a tweeter and a woofer unit.

[0071] In the display device 100, as described above, the output unit ( Figure 6 The display device 100 includes a left speaker 310 and a right speaker 310, and outputs a sound including a low frequency range that is not reproduced from the exciter 300. That is, the display device 100 localizes the sound in the screen by directly exciting the screen and outputting the sound at a high frequency for localization. In addition, the display device 100 can perform broadband sound reproduction by outputting a low frequency from the left speaker 310 and the right speaker 310.

[0072] Please note that when setting Figure 6In the case of the configuration shown in , the display device 100 can also adjust the output (excitation) of the exciter 300 by controlling the separation of the reproduction signal into channels. The details of the channel separation control process will be described later.

[0073] (1-5. Configuration of Display Device According to Embodiment)

[0074] Next, the configuration of the display device 100 will be described. Figure 7 is a diagram showing a configuration example of a display device 100 according to an embodiment.

[0075] like Figure 7 As shown, the display device 100 includes a communication unit 110, a storage unit 120, and a control unit 130. Note that the display device 100 may include an input unit (keyboard, touch panel, etc.) that receives various operations from an administrator or the like who manages the display device 100.

[0076] The communication unit 110 is implemented by, for example, a network interface card (NIC), a network interface controller, etc. The communication unit 110 is connected to the network N in a wired or wireless manner, and transmits and receives information to and from an external device or the like that provides content to be reproduced by the display apparatus 100 via the network N. The network N is implemented by, for example, a wireless communication standard or system such as Bluetooth (registered trademark), the Internet, Wi-Fi (registered trademark), ultra-wideband (UWB), or low-power wide area (LPWA).

[0077] The storage unit 120 is realized by, for example, a semiconductor storage element such as a random access memory (RAM) or a flash memory, or a storage device such as a hard disk or an optical disk.

[0078] For example, the storage unit 120 stores image content and sound content reproduced by the display device 100. In addition, the storage unit 120 may store information such as the area, weight, material, etc. of the display unit 200, or information such as the frequency domain when the vibration exciter 300 is excited in the display unit 200.

[0079] The control unit 130 is implemented by, for example, a central processing unit (CPU), a microprocessing unit (MPU), a GPU, etc., so that a program (for example, a display control program according to the present disclosure) stored in the display device 100 is executed on a RAM, etc., which is a work area. In addition, the control unit 130 is a controller and can be implemented by, for example, an integrated circuit such as an application-specific integrated circuit (ASIC) or a field programmable gate array (FPGA).

[0080] like Figure 7 As shown, the control unit 130 includes an acquisition unit 131 and an output control unit 132 .

[0081] The acquisition unit 131 acquires various types of information. For example, the acquisition unit 131 acquires data of content to be reproduced by the display device 100 via the network N. In addition, the acquisition unit 131 may acquire information such as the area, weight, material, etc. of the display unit 200, or information such as the frequency domain when the vibration exciter 300 is excited in the display unit 200.

[0082] The output control unit 132 drives the vibration exciter 300 within a range exceeding a predetermined frequency based on information about the display unit 200, thereby performing control to output sound from the display unit 200. For example, the predetermined frequency may be determined in the information processing process according to the information on the display unit 200, or the predetermined frequency may be predetermined at the time of shipment or manufacturing. The sound controlled by the output control unit 132 is sent to the sound output part 350 and is actually output to the outside. It should be noted that the sound output unit 350 includes, for example, a member having a sound output function, such as the vibration exciter 300 or the side speaker 310.

[0083] For example, the output control unit 132 drives the exciter 300 based on a predetermined frequency determined according to the resonant frequency of the display unit 200. Specifically, the output control unit 132 sets a frequency exceeding twice the maximum value of the resonant frequency affecting the display as the predetermined frequency, and drives the exciter 300 in a frequency domain exceeding the predetermined frequency. Therefore, the output control unit 132 can drive the display unit 200 as a speaker while suppressing the screen moiré phenomenon.

[0084] In addition, the output control unit 132 may drive the exciter 300 based on a predetermined frequency determined according to the excitation force used to drive the exciter 300. Generally, as the excitation force increases, the display effect of the screen increases, and therefore, the excitation force may be a parameter that affects the display. Therefore, the output control unit 132 may determine the predetermined frequency in consideration of the excitation force at the time of detection, and drive the exciter 300 based on the determined predetermined frequency.

[0085] In addition, the output control unit 132 may drive the vibrator 300 based on a predetermined frequency determined according to the weight of the display unit 200. This is because it is assumed that the resonant frequency in the display unit 200 changes or the value of the frequency affecting the display changes according to the weight. In other words, the output control unit 132 may determine the predetermined frequency in advance considering the weight of the display unit 200 in the detection, and drive the vibrator 300 based on the determined predetermined frequency. For example, when the weight of the display unit 200 decreases, the sound pressure of the sound output by the vibration of the vibrator 300 increases. In this case, the output control unit 132 may vibrate the vibrator 300 in a lower frequency band. On the other hand, when the weight of the display unit 200 increases, the sound pressure of the sound output by the vibration of the vibrator 300 decreases. At this time, since the output control unit 132 needs to increase the excitation force of the vibrator 300 to maintain the sound pressure, the excitation frequency of the vibrator 300 may be further increased in order to suppress the ripple phenomenon.

[0086] In addition, the output control unit 132 may drive the exciter 300 based on a predetermined frequency determined according to the area of ​​the display unit 200. This is because it is assumed that the resonance frequency in the display unit 200 changes or the value of the frequency affecting the display changes according to the area of ​​the display unit 200 (ie, the display area of ​​the liquid crystal panel).

[0087] Note that the weight and area of ​​the display unit 200 described above and the excitation force applied to the exciter 300 may affect each other. Therefore, for example, the output control unit 132 detects the optimal predetermined frequency with respect to the actual display unit 200 through preprocessing, and then determines the frequency domain in which the exciter 300 is excited.

[0088] Note that Figure 6 As shown, in addition to the flat panel speaker through the vibrator 300, the display device 100 may further include a sound output unit (such as a side speaker 310) that does not depend on the vibrator 300. In this case, the output control unit 132 controls the driving of the sound output unit other than the vibrator together with the vibrator 300.

[0089] That is, in the case where the sound output unit 350 includes a plurality of components, the output control unit 132 can control how to output the sound from each channel. For example, the output control unit 132 controls the sound output from the exciter 300 (high frequency output) or another sound output unit (mid-frequency to low frequency output) by using a circuit that separates the sound.

[0090] Reference Figure 8 and Fig. 9 Describe this. Figure 8 is a block diagram showing an example of sound output according to the present embodiment. Figure 8An example is shown in which the output control unit 132 outputs sound from the vibration exciter 300 for high-frequency output and outputs sound from the woofer 320 for middle-low frequency output.

[0091] In this case, for high-frequency output, the output control unit 132 cuts off the intermediate to low-frequency parts of the sound by passing the input sound through the high-pass filter (HPF) 503 via the gain adjustment unit 501 and the equalizer 502. Thereafter, the sound signal is input to the exciter 300 via the delay unit 504 and the amplifier 505, and is output as sound through the vibration of the exciter 300.

[0092] On the other hand, the output control unit 132 cuts off the high frequency portion of the sound by passing the input sound through a low pass filter (LPF) 513 via a gain adjustment unit 511 and an equalizer 512 for mid-low frequency output. Thereafter, the sound signal is input to the woofer 320 via a delay unit 514 and an amplifier 515, and is output as sound from the woofer 320.

[0093] As described above, when receiving an input of a sound signal, the output control unit 132 may separate the sound signal based on a predetermined frequency, drive the vibration exciter 300 using the separated high-frequency (i.e., frequency domain exceeding the predetermined frequency) sound signal, and drive the sound output unit other than the vibration exciter 300 using the separated medium-low frequency (i.e., frequency domain equal to or lower than the predetermined frequency) sound signal. In this case, the output control unit 132 may perform control to drive the sound output unit other than the vibration exciter 300 only with the separated sound signal corresponding to the frequency domain equal to or lower than the predetermined frequency.

[0094] Next, we will refer to Fig. 9 An embodiment in which the sound output unit 350 includes a C channel (exciter 300 ) and LR channels (L-ch speaker 321 and R-ch speaker 322 ) is described. Fig. 9 is a block diagram showing another example of sound output according to an embodiment. Fig. 9 In the Figure 8 An illustration of the same configuration as .

[0095] exist Fig. 9 In the embodiment of the present invention, for high frequency output, the output control unit 132 cuts off the intermediate to low frequency parts of the sound by passing the input sound through the HPF 520. Thereafter, the sound signal is input to the exciter 300 and is output as the sound of the C channel through the vibration of the exciter 300.

[0096] On the other hand, for the low-mid frequency output of the C channel, the output control unit 132 cuts the high frequency portion of the sound by passing the input sound through the LPF 521. Thereafter, the sound signal is separated into the L channel and the R channel, respectively, and synthesized into an original L channel sound signal and an original R channel sound signal. Then, the sound signal is input to the L-ch speaker 321 or the R-ch speaker 322, and is output as the sound of the L-R channels from each speaker.

[0097] As described above, the output control unit 132 may control the sound output unit 350, wherein the exciter 300 is set to the center channel output, and the sound output unit other than the exciter is set to the left channel output and the right channel output. In this case, the output control unit 132 separates the mid-low frequency part of the sound signal input to the center channel output, and synthesizes the separated sound signal components into the sound signals input to the left channel output and the right channel output.

[0098] Note that in such a multi-channel sound output mechanism, the output control unit 132 can adjust the output value and frequency band of the output signal by using signal processing. For example, in the case where the sound output value of the exciter 300 is less than expected, the output control unit 132 can supplement the output with the output of the LR channel. In this case, the output control unit 132 can appropriately adjust the frequency of the set LPF or HPF so that the sound is reproduced at the optimal frequency in the entire multi-channel. These adjustments can be achieved by known sound signal separation processing, etc.

[0099] In addition, in the case where the output from the exciter 300 is greater than expected (i.e., in the case where the excitation force increases), the output control unit 132 may adjust the predetermined frequency according to the output value so as not to affect the screen. As a result, the output control unit 132 may perform control so as not to cause the screen ripple phenomenon even in the case where the output value of the sound increases.

[0100] The display unit 200 is a functional unit for displaying images, etc., that is, a display. In this embodiment, the display unit 200 is a Figure 2 An LCD panel having the configuration shown in FIG.

[0101] For example, the display unit 200 is configured as an edge-type liquid crystal panel. More specifically, the display unit 200 has a structure in which no air layer is provided between the exciter 300, the light guide plate in the edge-light type liquid crystal panel, and the liquid crystal unit. As a result, the display device 100 can transmit the excitation force of the exciter 300 to the surface (screen side) of the liquid crystal panel without passing through the air layer, so that the display unit 200 can be used as a flat speaker with sufficient output.

[0102] As an embodiment, the display unit 200 may adopt Figure 1 However, the display unit 200 is not limited to the stereoscopic display, and may be any mode as long as it is a liquid crystal panel.

[0103] (1-6. Modification of Configuration of Display Device)

[0104] Although it has been described above that the display device 100 may include the multi-channel sound output unit 350, the configuration of the sound output unit 350 may be variously modified. Figures 10 to 15 Describe this.

[0105] Fig.10 FIG. 1 is a diagram showing a configuration of a display device 100 according to a modification example. Fig.10 In the embodiment, the display device 100 includes: an output unit that causes the display unit 200 to function as a flat speaker unit by vibration of the exciter 300; and a speaker 330 that outputs mid-frequency to low-frequency sounds at the lower center of the screen. In this configuration, the display device 100 outputs the sound by, for example, Figure 8 The signal path shown in FIG. 1 outputs sound.

[0106] Fig.11 FIG. 2 is a diagram showing a configuration of a display device 100 according to a modification example. Fig.11 In the embodiment, the display device 100 includes an output unit that enables the display unit 200 to function as a flat speaker unit by vibration of the exciter 300, and LR speakers (speakers 331 and 332) that output mid-range to low-range sounds at the left and right ends of the screen. In this configuration, the display device 100 outputs the sound by, for example, Fig. 9 The signal path shown in FIG. 1 outputs sound.

[0107] Fig.12 FIG. 3 is a diagram showing a configuration of a display device 100 according to a modification example. Fig.12 , the display device 100 includes three output units that enable the display unit 200 to function as a flat panel speaker unit through the vibration of the exciter 300, and LR speakers that output mid-frequency to low-frequency sounds at the left and right ends of the screen. As described above, the display device 100 may have a configuration including a plurality of exciters. In this case, the output control unit 132 controls the outputs of the exciters 300, 301, and 302. Note that a component for separating vibration areas (such as a belt for vibration suppression) may be provided between the exciter 300, the exciter 301, and the exciter 302 constituting the flat panel speaker unit.

[0108] Fig.13 FIG. 4 is a diagram showing a configuration of a display device 100 according to a modification example. Fig.13In the embodiment, the display device 100 includes three output units that enable the display unit 200 to function as a flat speaker unit through the vibration of the exciter 300, a speaker 330 that outputs mid-frequency to low-frequency sounds at the lower center of the screen, and LR speakers that output mid-frequency to low-frequency sounds at the left and right ends of the screen.

[0109] Fig.14 FIG. 5 is a diagram showing a configuration of a display device 100 according to a modified example. Fig.14 , the display device 100 includes six output units that make the display unit 200 function as a flat speaker unit through the vibration of the exciter 300, and LR speakers that output mid-frequency to low-frequency sounds at the left and right ends of the screen. Also in this case, a component for separating vibration areas may be provided between the exciter 300, the exciter 301, the exciter 302, the exciter 303, the exciter 304, and the exciter 305 constituting the flat speaker unit.

[0110] Fig.15 FIG. 6 is a diagram showing a configuration of a display device 100 according to a modification example. Fig.15 In the embodiment, the display device 100 includes: six output units, which enable the display unit 200 to be used as a flat speaker unit through the vibration of the exciter 300; speakers 330 and speakers 333, which output mid-frequency to low-frequency sounds at the upper and lower centers of the screen; LR speakers, which output mid-frequency to low-frequency sounds at the left and right ends of the screen.

[0111] As described above, in the display device 100, the sound output unit 350 can be configured by combining the exciter 300 and the speaker in various modes. Therefore, the display device 100 can implement various modes of sound output according to a request for content to be reproduced or a user's request. Note that Figures 10 to 15 The speakers shown in do not have to be arranged near the screen, but can be connected by wire or wirelessly and installed at a location away from the screen.

[0112] (2. Other implementation methods)

[0113] In addition to the above-described embodiments, the processing according to the above-described embodiments may be implemented in various different ways.

[0114] Furthermore, in the processes described in the above embodiments, all or part of the processes described as automatic processes may be performed manually, or all or part of the processes described as manual processes may be performed automatically by known methods. In addition, unless otherwise specified, the processing procedures, specific names, and information including various data and parameters indicated in the above documents and drawings may be arbitrarily changed. For example, the various types of information shown in the drawings are not limited to the information shown.

[0115] In addition, the constituent elements of each device shown in the drawings are conceptual in function and are not necessarily physically configured as shown in the drawings. Specifically, the specific form of distribution and integration of the device is not limited to the form shown in the drawings, and all or part of it can be configured by functionally or physically distributing and integrating in any unit according to various loads, usage conditions, etc.

[0116] For example, in the embodiment, the display device 100 has been exemplified as a display-integrated information device including the display unit 200. However, the display unit 200 may be an external display connected to an information device such as a PC via an interface. In this case, the information processing of the present disclosure may be used as a signal control method for driving an external display as a speaker.

[0117] Furthermore, the above-described embodiment and modified examples can be appropriately combined within a range in which the processing contents do not conflict with each other.

[0118] Furthermore, the effects described in this specification are merely embodiments and are not limited, and other effects may be provided.

[0119] (3. Effects of the display device according to the present disclosure)

[0120] As described above, the display device according to the present disclosure (display device 100 in the embodiment) includes: a display unit including a liquid crystal panel (display unit 200 in the embodiment); and an exciter (exciter 300 in the embodiment) attached to the opposite side of the surface of the liquid crystal panel and driving the liquid crystal panel to vibrate. In addition, the display device includes an output control unit (in the embodiment, output control unit 132) that drives the exciter in a range exceeding a predetermined frequency based on information about the liquid crystal panel to control the output of sound from the liquid crystal panel.

[0121] As described above, the display device determines a predetermined frequency used as a reference based on the liquid crystal panel, and controls the exciter to vibrate in a frequency band exceeding the predetermined frequency. Therefore, the display device can drive the liquid crystal panel as a flat speaker while suppressing frequencies in the mid-frequency to low-frequency range that may affect the display. That is, the display device can achieve sound output that does not cause image blur while eliminating insufficient sound pressure.

[0122] The output control unit drives the exciter according to a predetermined frequency based on the resonant frequency of the liquid crystal panel. In addition, the output control unit may drive the exciter according to a predetermined frequency based on an excitation force used to drive the exciter. In addition, the output control unit may drive the exciter according to a predetermined frequency based on the weight of the liquid crystal panel. In addition, the output control unit may drive the exciter according to a predetermined frequency based on the area of ​​the liquid crystal panel.

[0123] As described above, the display device determines a different predetermined frequency for each liquid crystal panel according to the weight of the liquid crystal panel, etc., and then drives the exciter, so that sound can be output without causing image blur in various liquid crystal panels.

[0124] Furthermore, the display device further includes a sound output unit that performs sound output by a method different from that of the vibrator. The output control unit controls driving of the sound output unit except for the vibrator together with the vibrator.

[0125] As described above, the display device includes another speaker driven together with the exciter, so that rich sound reproduction including middle frequencies to low frequencies that are not output from the exciter can be achieved.

[0126] Furthermore, when receiving an input of a sound signal, the output control unit may separate the sound signal based on a predetermined frequency, drive the exciter using the separated high-frequency sound signal, and drive the sound output unit other than the exciter using the separated medium-frequency to low-frequency sound signal. Furthermore, in the case where the output control unit includes a sound output unit including an exciter as a center channel output and a sound output unit other than the exciter as a left channel output and a right channel output, the output control unit may separate the medium- and low-frequency parts of the sound signal input to the center channel output, and synthesize the separated sound signal components with the sound signals input to the left channel output and the right channel output.

[0127] As described above, in the display device, the sound signal is separated between the exciter and the normal speaker, so that control can be performed so that medium to low frequency sounds are not output from the exciter, and therefore, the occurrence of image blur of the liquid crystal panel can be suppressed.

[0128] In addition, the liquid crystal panel may be an edge-lit liquid crystal panel. In addition, the liquid crystal panel may have a structure in which no air layer is provided between the light guide plate and the liquid crystal cell in the exciter and edge-lit liquid crystal panel.

[0129] As described above, the display device according to the configuration of the present disclosure can realize a function as a flat speaker while suppressing image blur even in a liquid crystal panel that is prone to image blurring compared to an organic light emitting diode (OLED) panel or the like.

[0130] Furthermore, a plurality of exciters may be attached to opposite sides of the surface of the liquid crystal panel. The output control unit controls outputs of the plurality of exciters.

[0131] As described above, the display device can ensure greater sound pressure and achieve sound reproduction with a more excellent sense of localization by controlling a plurality of exciters.

[0132] In addition, a vibrator is installed on the opposite side of the upright image display side in the stereoscopic display and is driven to vibrate the stereoscopic display. The output control unit drives the vibrator within a range not exceeding a predetermined frequency based on information about the stereoscopic display, thereby performing control to output sound from the stereoscopic display.

[0133] As described above, the display device enables sound reproduction with a sense of reality being on the screen even when watching / listening on a stereoscopic display where the user is located at a short distance, compared to watching / listening on a normal TV or the like.

[0134] In addition, the display device includes a display unit including an edge-light type liquid crystal panel and an exciter bonded to opposite sides of a surface of the edge-light type liquid crystal panel and driving the edge-light type liquid crystal panel to vibrate. The exciter includes at least one vibration element for frequency domain output exceeding a predetermined frequency.

[0135] As described above, the display device includes a vibration element (piezoelectric element) that outputs high-frequency sound, so that a flat panel speaker in which image blur is suppressed can function.

[0136] (4. Hardware configuration)

[0137] For example, by having Fig.16 The computer 1000 of the configuration shown in embodies an information device such as the display apparatus 100 according to the above-described embodiment. Hereinafter, the display apparatus 100 according to the embodiment will be described as an example. Fig.16 1 is a hardware configuration diagram showing an embodiment of a computer 1000 that realizes the functions of the display device 100. The computer 1000 includes a CPU 1100, a RAM 1200, a read-only memory (ROM) 1300, a hard disk drive (HDD) 1400, a communication interface 1500, and an input / output interface 1600. Each unit of the computer 1000 is connected by a bus 1050.

[0138] The CPU 1100 operates based on the program stored in the ROM 1300 or the HDD 1400, and controls each unit. For example, the CPU 1100 decompresses the program stored in the ROM 1300 or the HDD 1400 in the RAM 1200, and executes processing corresponding to various programs.

[0139] The ROM 1300 stores a startup program such as a basic input output system (BIOS) executed by the CPU 1100 when the computer 1000 is started, a program depending on the hardware of the computer 1000 , and the like.

[0140] The HDD 1400 is a computer-readable recording medium that non-transiently records a program executed by the CPU 1100 , data used by the program, etc. Specifically, the HDD 1400 is a recording medium that records an information processing program according to the present disclosure as an embodiment of the program data 1450 .

[0141] The communication interface 1500 is an interface for connecting the computer 1000 to an external network 1550 (eg, the Internet). For example, the CPU 1100 receives data from another device via the communication interface 1500 or transmits data generated by the CPU 1100 to another device.

[0142] 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 input devices such as a keyboard and a mouse via the input / output interface 1600. In addition, the CPU 1100 transmits data to an output device such as a display, a speaker, or a printer via the input / output interface 1600. In addition, the input / output interface 1600 can be used as a medium interface for reading a program recorded in a predetermined recording medium (medium). For example, the medium is an optical recording medium such as a digital versatile disk (DVD) or a phase change rewritable disk (PD), a magneto-optical recording medium such as a magneto-optical disk (MO), a magnetic tape medium, a magnetic recording medium, a semiconductor memory, etc.

[0143] For example, in the case where the computer 1000 is used as the display device 100 according to the embodiment, the CPU 1100 of the computer 1000 implements the functions of the control unit 130 and the like by executing the signal processing program loaded on the RAM 1200. In addition, the HDD 1400 stores data such as the signal processing program and the like. Note that the CPU 1100 reads the program data 1450 from the HDD 1400 and executes the program data, but as another embodiment, these programs may be acquired from another device via the external network 1550.

[0144] It should be noted that the present technology can also have the following configurations.

[0145] (1) A display device comprising:

[0146] A display unit including a liquid crystal panel;

[0147] an exciter bonded to the opposite side of the surface of the liquid crystal panel and driven to vibrate the liquid crystal panel; and

[0148] The output control unit is configured to control the driving exciter within a range exceeding a predetermined frequency based on the information on the liquid crystal panel to output sound from the liquid crystal panel.

[0149] (2) The display device according to (1), wherein:

[0150] Output control unit

[0151] The exciter is driven at a predetermined frequency based on the resonance frequency of the liquid crystal panel.

[0152] (3) The display device according to (2), wherein:

[0153] Output control unit

[0154] The exciter is driven according to a predetermined frequency based on an excitation force for driving the exciter.

[0155] (4) The display device according to (2) or (3), wherein:

[0156] Output control unit

[0157] The vibrator is driven according to a predetermined frequency based on the weight of the liquid crystal panel.

[0158] (5) The display device according to any one of (2) to (4), wherein:

[0159] Output control unit

[0160] The exciter is driven according to a predetermined frequency based on the area of ​​the liquid crystal panel.

[0161] (6) The display device according to any one of (1) to (5), further comprising:

[0162] A sound output unit is configured to perform sound output by a method different from that of the vibration exciter, wherein

[0163] Output control unit

[0164] The driving of the audio output unit other than the exciter is controlled together with the exciter.

[0165] (7) The display device according to (6), wherein:

[0166] When receiving an input of a sound signal, the output control unit separates the sound signal based on a predetermined frequency, drives the exciter using the separated sound signal corresponding to a frequency domain exceeding the predetermined frequency, and drives a sound output unit other than the exciter using the separated sound signal including a frequency domain equal to or lower than the predetermined frequency.

[0167] (8) The display device according to (7), wherein:

[0168] Output control unit

[0169] The sound output unit other than the exciter is driven by the separated sound signal of the frequency domain corresponding to a frequency equal to or less than a predetermined frequency.

[0170] (9) The display device according to (7) or (8), wherein:

[0171] In a case where the output control unit includes a sound output unit having an exciter as a center channel output and a sound output unit other than the exciter as left channel output and right channel output, the output control unit separates a frequency domain equal to or lower than a predetermined frequency of a sound signal input to the center channel output, and synthesizes the separated sound signal components with the sound signals input to the left channel output and the right channel output.

[0172] (10) The display device according to any one of (1) to (9), wherein:

[0173] LCD Panel

[0174] It is an edge-type LCD panel.

[0175] (11) The display device according to (10), wherein:

[0176] LCD Panel

[0177] The invention has a structure in which no air layer is provided between an exciter, a light guide plate and a liquid crystal cell in an edge light type liquid crystal panel.

[0178] (12) The display device according to (11), wherein:

[0179] Multiple shakers;

[0180] bonded to the opposite side of the surface of the liquid crystal panel, and

[0181] Output control unit

[0182] Controls the output of multiple shakers.

[0183] (13) The display device according to any one of (1) to (12), wherein:

[0184] Vibrator

[0185] is installed on the opposite side of the upright image display side in the stereoscopic display and is driven to vibrate the stereoscopic display, and

[0186] Output control unit

[0187] The exciter is controlled to be driven within a range not exceeding a predetermined frequency based on the information on the stereoscopic display to output sound from the stereoscopic display.

[0188] (14) A signal processing method performed by a display device serving as a computer, comprising:

[0189] A display unit including a liquid crystal panel; and

[0190] an exciter, which is bonded to the opposite side of the surface of the liquid crystal panel and driven to vibrate the liquid crystal panel, the method comprising:

[0191] The exciter is controlled to be driven within a range exceeding a predetermined frequency based on information about the liquid crystal panel to output sound from the liquid crystal panel.

[0192] (15) The signal processing method according to (14), wherein:

[0193] The exciter is driven according to a predetermined frequency based on the resonance frequency of the liquid crystal panel.

[0194] (16) The signal processing method according to (15), wherein:

[0195] The vibration exciter is driven according to a predetermined frequency based on an excitation force for driving the vibration exciter.

[0196] (17) The signal processing method according to (15) or (16), wherein:

[0197] The vibrator is driven according to a predetermined frequency based on the weight of the liquid crystal panel.

[0198] (18) The signal processing method according to any one of (15) to (17), wherein:

[0199] The exciter is driven according to a predetermined frequency based on the area of ​​the liquid crystal panel.

[0200] (19) The signal processing method according to any one of (14) to (18), wherein:

[0201] Display Devices

[0202] A sound output unit is included, the sound output unit is configured to perform sound output by a method different from the exciter, and the method further includes:

[0203] The driving of the sound output unit other than the vibration exciter is controlled together with the vibration exciter.

[0204] (20) A display device comprising:

[0205] A display unit including an edge-lit liquid crystal panel; and

[0206] an exciter coupled to an opposite side of a surface of the edge-lit liquid crystal panel and driven to vibrate the edge-lit liquid crystal panel, wherein

[0207] Vibrator

[0208] At least one vibrating element is included for frequency domain output exceeding a predetermined frequency.

[0209] Reference Numbers List

[0210] 100 Display devices

[0211] 110 Communication unit

[0212] 120 storage units

[0213] 130 Control unit

[0214] 131 Get Unit

[0215] 132 Output control unit

[0216] 200 display units

[0217] 210 LCD units

[0218] 220 Diffuser Plate

[0219] 230 Light guide plate

[0220] 240 reflective sheet

[0221] 250 Sheet Metal Parts

[0222] 260 Light Source

[0223] 300 Vibrator

[0224] 310 Side Speaker

[0225] 350 Sound output unit.

Claims

1. A display device, comprising: A display unit including a liquid crystal panel; an exciter bonded to the opposite side of the surface of the liquid crystal panel and driven to vibrate the liquid crystal panel; as well as An output control unit is configured to control driving of the exciter within a range exceeding a predetermined frequency based on information on the liquid crystal panel to output sound from the liquid crystal panel.

2. The display device according to claim 1, wherein: The output control unit The exciter is driven according to the predetermined frequency based on a resonance frequency of the liquid crystal panel.

3. The display device according to claim 2, wherein: The output control unit The exciter is driven according to the predetermined frequency based on an excitation force for driving the exciter.

4. The display device according to claim 2, wherein: The output control unit The vibrator is driven according to the predetermined frequency based on the weight of the liquid crystal panel.

5. The display device according to claim 2, wherein: The output control unit The exciter is driven at the predetermined frequency based on the area of ​​the liquid crystal panel.

6. The display device according to claim 1, further comprising: A sound output unit is configured to perform sound output by a method different from that of the exciter, wherein The output control unit The driving of the audio output unit other than the exciter is controlled together with the exciter.

7. The display device according to claim 6, wherein: When receiving an input of a sound signal, the output control unit separates the sound signal based on the predetermined frequency, drives the exciter using the separated sound signal corresponding to the frequency domain exceeding the predetermined frequency, and drives the sound output unit other than the exciter using the separated sound signal including the frequency domain equal to or lower than the predetermined frequency.

8. The display device according to claim 7, wherein: The output control unit A sound output unit other than the exciter is driven using the separated sound signal corresponding to a frequency domain equal to or less than the predetermined frequency.

9. The display device according to claim 7, wherein: In a case where the output control unit includes a sound output unit having an exciter as a center channel output and a sound output unit other than the exciter as left channel output and right channel output, the output control unit separates a frequency domain equal to or lower than the predetermined frequency of a sound signal input to the center channel output, and synthesizes the separated sound signal components with the sound signals input to the left channel output and the right channel output.

10. The display device according to claim 1, wherein: The liquid crystal panel It is an edge-type LCD panel.

11. The display device according to claim 10, wherein: The liquid crystal panel The invention has a structure in which no air layer is provided between the exciter, the light guide plate and the liquid crystal unit in the edge light type liquid crystal panel.

12. The display device according to claim 11, wherein: Multiple shakers; bonded to the opposite side of the surface of the liquid crystal panel, and The output control unit The outputs of the plurality of exciters are controlled.

13. The display device according to claim 1, wherein: The exciter is installed on the opposite side of the upright image display side in the stereoscopic display and is driven to vibrate the stereoscopic display, and The output control unit The exciter is controlled to be driven within a range not exceeding a predetermined frequency based on information on the stereoscopic display to output sound from the stereoscopic display.

14. A signal processing method performed by a display device as a computer, the computer comprising: A display unit including a liquid crystal panel; as well as an exciter coupled to an opposite side of a surface of the liquid crystal panel and driven to vibrate the liquid crystal panel, the method comprising: The exciter is controlled to be driven within a range exceeding a predetermined frequency based on information about the liquid crystal panel to output sound from the liquid crystal panel.

15. The signal processing method according to claim 14, wherein: The exciter is driven according to the predetermined frequency based on the resonance frequency of the liquid crystal panel.

16. The signal processing method according to claim 15, wherein: The vibration exciter is driven according to the predetermined frequency based on the excitation force for driving the vibration exciter.

17. The signal processing method according to claim 15, wherein: The vibrator is driven according to the predetermined frequency based on the weight of the liquid crystal panel.

18. The signal processing method according to claim 15, wherein: The exciter is driven according to the predetermined frequency based on the area of ​​the liquid crystal panel.

19. The signal processing method according to claim 14, wherein: Display Devices A sound output unit is included, the sound output unit is configured to perform sound output by a method different from the exciter, the method further comprising: The driving of a sound output unit other than the exciter is controlled together with the exciter.

20. A display device comprising: A display unit including an edge-lit liquid crystal panel; as well as an exciter coupled to an opposite side of a surface of the edge-lit liquid crystal panel and driven to vibrate the edge-lit liquid crystal panel, wherein: The exciter At least one vibrating element is included for frequency domain output exceeding a predetermined frequency.

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