Display device

Abstract

This application belongs to the field of display technology, and particularly relates to a display device, including: a liquid crystal display panel and a sound generating structure. The sound generating structure is disposed on the display side of the liquid crystal display panel. The sound generating structure includes a sound generating layer, and a first electrode and a second electrode disposed on opposite sides of the sound generating layer. The first electrode and the second electrode are configured to form a driving electric field between the first electrode and the second electrode according to the voltages applied to the two electrodes. A plurality of grooves with an opening direction perpendicular to the electric field direction of the driving electric field are provided on the sound generating layer, and adjacent grooves are spaced apart; wherein, the sound generating layer can generate a force perpendicular to the electric field direction under the action of the driving electric field, and the force drives the sound generating layer in the groove to move perpendicular to the electric field direction, so as to drive the air in the groove to vibrate and generate sound. This application can achieve sound generation under the screen and ensure the display effect of the liquid crystal display panel.

Description

Technical Field

[0001] This application belongs to the field of display technology, and particularly relates to a display device. Background Art

[0002] With the development of display technology, consumers not only require high picture quality and clarity for display devices, but also gradually pay attention to the sound output effect.

[0003] In the prior art, an exciter is mainly used to implement the sound generation technology. The exciter is integrated into the whole machine system, and the sound is emitted through the vibration module of the exciter. However, this vibration method easily causes abnormal deflection of liquid crystals in the liquid crystal display panel, thereby affecting the display picture of the liquid crystal display panel. Moreover, there are also problems such as large vibration amplitude and high noise in the way of generating sound through the vibration of the exciter. Summary of the Invention

[0004] The purpose of this application is to solve the problems in the prior art, such as abnormal deflection of liquid crystal molecules caused by vibration, large vibration amplitude, and high noise.

[0005] This application provides a display device, including: a liquid crystal display panel; a sound generating structure disposed on the display side of the liquid crystal display panel. The sound generating structure includes a sound generating layer, and a first electrode and a second electrode disposed on opposite sides of the sound generating layer. The first electrode and the second electrode are used to form a driving electric field between the first electrode and the second electrode according to the voltage applied to both of them. A plurality of grooves with an opening direction perpendicular to the electric field direction of the driving electric field are provided on the sound generating layer, and adjacent grooves are spaced apart; wherein, the sound generating layer can generate a force perpendicular to the electric field direction under the action of the driving electric field, and the force drives the sound generating layer in the groove to move perpendicular to the electric field direction, so as to drive the air in the groove to vibrate and generate sound.

[0006] In an exemplary embodiment of this application, in the direction from the liquid crystal display panel to the sound generating structure, the caliber of the groove gradually increases.

[0007] In an exemplary embodiment of this application, the groove includes a first arc segment and a second arc segment connected to each other. The first arc segment is disposed on the side of the second arc segment close to the liquid crystal display panel, and the first arc segment is bent away from the liquid crystal display panel, and the second arc segment is bent toward the liquid crystal display panel.

[0008] In an exemplary embodiment of this application, a sealed cavity is formed between the surface of the sound generating layer and the display side of the liquid crystal display panel, and the surface of the sound generating layer can move perpendicular to the electric field direction under the action of the force.

[0009] In an exemplary embodiment of the present application, the display device further includes an adhesive layer; one side of the sound - generating layer facing the liquid - crystal display panel is bonded to the liquid - crystal display panel through the adhesive layer.

[0010] In an exemplary embodiment of the present application, the display device further includes a first protective layer and a polarizing layer which are stacked in sequence. The polarizing layer is disposed on a side of the first protective layer away from the liquid - crystal display panel. The polarizing layer and the sound - generating layer form the sealed cavity, and at least two bottom edges of the polarizing layer are bonded to the sound - generating layer through the adhesive layer.

[0011] In an exemplary embodiment of the present application, the display device further includes a second protective layer, and the second protective layer covers a side of the sound - generating layer away from the liquid - crystal display panel.

[0012] In an exemplary embodiment of the present application, the display device further includes: a control board, which is arranged at an interval from the liquid - crystal display panel, and a control chip is provided on the control board; a flexible circuit board, one end of the flexible circuit board is connected to the control board, and the other end is connected to the liquid - crystal display panel. The control chip is electrically connected to the first electrode and the second electrode through the flexible circuit board so as to apply different voltages to the first electrode and the second electrode.

[0013] In an exemplary embodiment of the present application, the liquid - crystal display panel includes array substrates arranged opposite to each other. First conductive lines and second conductive lines which are spaced apart from each other are provided on the array substrates. One end of the first conductive line is connected to the control chip through the flexible circuit board, and the other end is connected to the first electrode. One end of the second conductive line is connected to the control chip through the flexible circuit board, and the other end is connected to the second electrode.

[0014] In an exemplary embodiment of the present application, the display device further includes a heat - dissipating layer, and the heat - dissipating layer is attached to the control board.

[0015] The display device of the solution of the present application has at least the following beneficial effects:

[0016] The display device in the solution of this application includes a liquid crystal display panel and a sound - generating structure. The sound - generating structure is disposed on the display side of the liquid crystal display panel. The sound - generating structure includes a sound - generating layer, and a first electrode and a second electrode disposed on opposite sides of the sound - generating layer. According to the voltage applied to them, a driving electric field is formed between the first electrode and the second electrode. The sound - generating layer can generate a force perpendicular to the direction of the electric field under the action of the driving electric field. This force can drive the sound - generating layer in the groove to move in a direction perpendicular to the electric field direction, so as to drive the air in the groove to vibrate and generate sound. By disposing the sound - generating structure on the display side of the liquid crystal display panel, a screen - sound - generating technology with low noise and fast response speed can be realized. It can not only save the space of traditional exciters, but also avoid directly vibrating the display module and affecting the deflection angle of liquid crystal molecules in the liquid crystal display panel, ensuring the display effect of the liquid crystal display panel.

[0017] Other features and advantages of this application will become apparent from the following detailed description, or will be learned in part from the practice of this application.

[0018] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. Brief Description of the Drawings

[0019] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It shows a schematic cross - sectional structure diagram of the display device provided in the first embodiment of this application.

[0021] Figure 2 It shows a schematic diagram of the principle of the sound - generating structure provided in the first embodiment of this application.

[0022] Figure 3 It shows a schematic structural diagram of the sound - generating layer provided in the first embodiment of this application, on which there are a plurality of grooves.

[0023] Figure 4 It shows Figure 1 an enlarged structural diagram of the groove at position A in

[0024] Figure 5 It shows Figure 1 a schematic structural diagram of the bonding of the sound - generating layer at position B to the polarizing layer through an adhesive layer in

[0025] Figure 6The structural schematic diagram shows the first electrode and the second electrode provided in the second embodiment of the present application, which are disposed on the upper and lower sides of the sound - generating layer.

[0026] Figure 7 The principle schematic diagram shows the sound - generating structure provided in the second embodiment of the present application.

[0027] Explanation of reference numerals:

[0028] 100, display device; 110, liquid crystal display panel; 111, array substrate; 112, counter substrate; 120, sound - generating structure; 121, sound - generating layer; 1210, groove; 1211, first arc segment; 1212, second arc segment; 1220, sealed cavity; 122, first electrode; 123, second electrode; 130, backlight module; 140, lower polarizer; 150, adhesive layer; 160, first protective layer; 170, polarizing layer; 180, second protective layer; 190, light spacer array; 1100, control board; 1110, control chip; 1200, flexible circuit board; 1300, conductive silver paste. Detailed implementation manners

[0029] Now, the exemplary embodiments will be described more comprehensively with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more complete and comprehensive, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art.

[0030] In the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0031] In the present application, unless otherwise clearly defined and limited, terms such as "assembly" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms in the present application can be understood according to specific circumstances.

[0032] In addition, the described features, structures, or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present application. However, those skilled in the art will realize that the technical solutions of the present application can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the present application.

[0033] Embodiment 1

[0034] Embodiment 1 of the present application provides a display device 100 that can achieve screen sound emission, save the design space of traditional exciters, and has advantages such as low noise and fast response speed.

[0035] It should be noted that the display device 100 may be an Organic Light-Emitting Diode (OLED) display device 100, a Liquid Crystal Display (LCD) device 100, or an LED (Light Emitting Diode) display, etc.

[0036] Figure 1 The cross-sectional structural schematic diagram of the display device is shown.

[0037] In some embodiments of the present application, referring to Figure 1 as shown, this display device 100 is a liquid crystal display device 100. It includes a liquid crystal display panel 110 and a sound generating structure 120. The liquid crystal display panel 110 includes an incident light side (not marked in the figure) and a display side (not marked in the figure) that are oppositely arranged in its thickness direction. The sound generating structure 120 is provided on the display side of the liquid crystal display panel 110. The sound generating structure 120 has characteristics such as high-frequency vibration and small vibration amplitude. By designing the sound generating structure 120 inside the display device 100, not only can the design positions of external sound generating devices such as exciters be reduced, and the structure of the display device 100 be optimized, but also the situation where the vibration amplitude of the sound generating structure 120 is too large and affects the deflection angle of the liquid crystal molecules in the liquid crystal display panel 110 can be avoided, ensuring the display effect.

[0038] In some embodiments of the present application, please continue to refer to Figure 1 as shown, this display device 100 is a direct-lit backlight. This display device 100 further includes a backlight module 130. The backlight module 130 is disposed below the liquid crystal display panel 110, and the backlight module 130 can release light to the incident light side of the liquid crystal display panel 110 so that the display side of the liquid crystal display panel 110 displays an image.

[0039] It is understandable that in some other embodiments, the display device 100 may also be a side - entry backlight.

[0040] In some embodiments of the present application, please continue to refer to Figure 1 As shown, the display device 100 may further include a lower polarizer 140. The lower polarizer 140 is disposed on the light - incident side of the liquid - crystal display panel 110, and it can perform polarization filtering and protection on the light released by the backlight module 130 to ensure that the liquid - crystal layer can efficiently modulate light and achieve a display effect with high contrast and high color fidelity.

[0041] In some embodiments of the present application, please continue to refer to Figure 1 As shown, the liquid - crystal display panel 110 includes an array substrate 111 and a counter substrate 112 which are oppositely disposed, and a liquid - crystal layer (not shown in the figure) disposed between the array substrate 111 and the counter substrate 112. The liquid - crystal layer includes a plurality of liquid - crystal molecules arranged at intervals (not shown in the figure). These liquid - crystal molecules can be deflected according to the voltages applied to the array substrate 111 and the counter substrate 112 to modulate the polarization state of light and achieve grayscale display.

[0042] Figure 2 The schematic diagram of the principle structure of the sound - generating structure is shown. Figure 3 The schematic diagram of the structure with a plurality of grooves provided on the sound - generating layer is shown.

[0043] In some embodiments of the present application, please refer to Figure 1 and Figure 2 As shown, the sound - generating structure 120 includes a sound - generating layer 121, and a first electrode 122 and a second electrode 123 disposed on the left and right sides of the sound - generating layer 121 respectively. Different - polarity voltages can be applied to the first electrode 122 and the second electrode 123 respectively, so that a driving electric field is generated between the first electrode 122 and the second electrode 123. The sound - generating layer 121 can generate a force perpendicular to the direction of the electric field under the action of the driving electric field, and this force can drive the sound - generating layer 121 to perform periodic high - frequency vibration in the direction perpendicular to the electric field.

[0044] Among them, the sound - generating layer 121 can be made of a transparent dielectric elastomer material, such as silicone rubber, acrylic elastomer or polyurethane elastomer, or can also be made of a piezoelectric material, an ionic electroactive polymer or an electrostrictive material, etc. Using a transparent dielectric elastomer material for the sound - generating layer 121 can not only ensure sound generation but also ensure that the light of the liquid - crystal display panel 110 can pass through the sound - generating layer 121 and be emitted.

[0045] In some embodiments of the present application, refer to Figure 1 and Figure 3As shown, a plurality of grooves 1210 are provided on the sound-emitting layer 121, and the opening direction of the grooves 1210 is toward the side away from the display side, that is, the opening direction of the grooves 1210 is perpendicular to the electric field direction of the driving electric field. Adjacent grooves 1210 are arranged at intervals, and when the sound-emitting layer 121 is vibrated by the force, the sound-emitting layer 121 in the grooves 1210 will be driven to vibrate back and forth in a direction perpendicular to the electric field, that is, vibrate up and down, so as to drive the air in the grooves 1210 to vibrate and generate sound, so that the entire surface of the display device 100 generates sound.

[0046] In some embodiments of the present application, the thickness of the sound-emitting layer 121 may be 20 micrometers, so as to ensure that the overall thickness of the display device 100 is relatively thin while being able to emit sound.

[0047] In some other embodiments of the present application, the thickness of the sound-emitting layer 121 may also be 18 microns.

[0048] In some embodiments of the present application, the thickness of the sound-emitting layer 121 may also be 22 microns.

[0049] Figure 4 Shows Figure 1 Schematic diagram of the enlarged structure of the groove at position A in the middle.

[0050] In some embodiments of the present application, see Figure 3 and Figure 4 As shown, the sound-emitting layer 121 may be provided with a plurality of trumpet-shaped grooves 1210 arranged in an array, that is, in the direction from the liquid crystal display panel 110 to the sound-emitting structure 120, the diameter of the grooves 1210 gradually increases, so that the sound waves generated by the air vibration can be propagated in a more concentrated and directional manner, and by gradually increasing the diameter of the grooves 1210, the low-frequency sound can also be effectively enhanced.

[0051] In some embodiments of the present application, see Figure 3 As shown, the groove 1210 includes a first arc segment 1211 and a second arc segment 1212 connected to each other. The first arc segment 1211 is arranged on the side of the second arc segment 1212 close to the liquid crystal display panel 110, and is bent away from the side of the liquid crystal display panel 110, and the second arc segment 1212 is bent toward the liquid crystal display panel 110, that is, the bending directions of the first arc segment 1211 and the second arc segment 1212 are opposite, and the first arc segment 1211 and the second arc segment 1212 are tangent at the junction. When the light passes through the groove 1210, the light can be refracted at the first arc segment 1211 / the second arc segment 1212, and the refracted light enters the groove 1210 and is scattered at the first arc segment 1211 or the second arc segment 1212. The light is further scattered by the groove 1210 of the sound-emitting layer 121, so that the picture display is more uniform.

[0052] In some other embodiments, both the first arc segment 1211 and the second arc segment 1212 can be bent away from the side of the liquid crystal display panel 110. While ensuring the up-and-down vibration of the groove 1210, it can ensure that light is further scattered in the groove 1210, ensuring more uniform display of the picture.

[0053] It is worth mentioning that the depth of the groove 1210 can be 5-8 micrometers to ensure that the sound-generating layer 121 can effectively generate sound during vibration.

[0054] In some embodiments of the present application, as shown in Figure 3 a closed cavity 1220 can also be formed between the surface of the sound-generating layer 121 close to the liquid crystal display panel 110 and the display side of the liquid crystal display panel 110. Under the action of the driving electric field, the surface of the sound-generating layer 121 can move in a direction perpendicular to the electric field direction, so that the surface of the sound-generating layer 121 can vibrate back and forth in the closed cavity 1220, driving the air in the closed cavity 1220 to vibrate and generate sound, so as to further improve the sound-generating effect under the screen.

[0055] It can be understood that the electric field force of the driving electric field drives the sound-generating layer 121 to vibrate up and down in a direction perpendicular to the electric field direction. It can not only drive the groove 1210 to vibrate up and down in a direction perpendicular to the electric field direction, but also drive the sound-generating layer 121 to vibrate up and down in the closed cavity 1220. Through the vibration at these two positions, the sound generated by the display device 100 can be effectively obtained. By vibrating and generating sound through this sound-generating layer 121, not only can the design positions of sound-generating devices such as external exciters be reduced, optimizing the space of the display device 100, but also the excessive vibration amplitude of the sound-generating structure 120 can be avoided from affecting the deflection angle of liquid crystal molecules in the liquid crystal display panel 110, ensuring the display effect.

[0056] In addition, the force used to drive the vibration of the sound-generating layer 121 can be proportional to the square of the dielectric constant and the electric field strength, that is: , where ε is the dielectric constant and E is the electric field strength. That is, by controlling the voltages of both the first electrode 122 and the second electrode 123 and controlling the dielectric constant of the sound-generating layer 121, the force driving the vibration of the sound-generating layer 121 can be increased, and then the vibration frequency can be controlled.

[0057] In some embodiments of the present application, the sound - generating layer 121 includes a sound - generating body (not marked in the figure) and a dielectric member filled in the sound - generating body (not shown in the figure). The dielectric member can adopt high - dielectric - constant fillers, such as barium titanate, barium strontium titanate, strontium titanate, etc. The sound - generating body includes a plurality of single - layer films. The plurality of single - layer films are sequentially stacked in the thickness direction of the liquid - crystal display panel 110 to form the sound - generating body. Each single - layer film is filled with the above - mentioned dielectric member to increase the force driving the vibration of the sound - generating layer 121.

[0058] It can be understood that by adding a dielectric member to the sound - generating body, the dielectric performance of the sound - generating layer 121 can be improved, and the force driving the vibration of the sound - generating layer 121 can be increased. While ensuring that the sound - generating layer 121 can be driven to vibrate, due to the increase in the dielectric constant, the driving voltage can be reduced, and the sound - generating cost can be reduced; moreover, adding a dielectric member can also reduce the amount of deformation.

[0059] In addition, adopting the structure of stacking single - layer films can reduce the driving voltage of the single - layer film and improve the overall breakdown voltage and reliability.

[0060] It should be noted that the manufacturing process of the sound - generating layer 121 can be as follows: First, prepare the single - layer film; mix the polyurethane material and the dielectric member evenly, and use the casting coating method to evenly coat the mixed material into a mold (not shown in the figure), and dry it at 60 °C to remove the solvent, and then demold. Second, multi - layer stacking; stack multiple single - layer films using the dry - stacking method, and place the stacked film in a vacuum. At a pressure of 2 - 6 Mpa and a cross - linking temperature of 170 °C, keep it for 10 minutes to 1 hour. Third, post - treatment; clean the film with a solvent (sodium hypochlorite solution).

[0061] Among them, the mold can be selected from metal or high - temperature - resistant plastics, and is made by computer numerical control machining or 3D printing technology. It can have a plurality of slotted grooves arranged in an array thereon to form the groove 1210 of the sound - generating layer 121. An incompletely polymerized precursor solution can be added between the single - layer films to enhance adhesion. The thickness of the single - layer film can be 2 microns, so that the film thickness of the stacked sound - generating layer 121 is relatively uniform, and it can also ensure that the sound - generating layer 121 can be driven to vibrate and generate sound with a relatively low driving voltage.

[0062] Figure 5 Shows Figure 1 The schematic structural diagram of the bonding of the sound - generating layer at B to the polarizing layer through the adhesive layer.

[0063] In some embodiments of the present application, refer to Figure 5As shown, the display device 100 further includes an adhesive layer 150 disposed between the sound - generating layer 121 and the liquid - crystal display panel 110. One side of the sound - generating layer 121 facing the liquid - crystal display panel 110 is bonded to the liquid - crystal display panel 110 through the adhesive layer 150 to firmly bond the sound - generating layer 121 and the liquid - crystal display panel 110 and prevent them from falling off due to vibration.

[0064] In some embodiments of the present application, as shown in Figure 1 As shown, the thickness of the outer edges on the opposite sides of the first electrode 122 and the second electrode 123 provided on the sound - generating layer 121 is greater than the thickness of the inner side of the sound - generating layer 121, so that the sound - generating layer 121 can be adhesively connected to the liquid - crystal display panel 110 through the outer edges on the opposite sides, which can prevent the inner side of the sound - generating layer 121 from being adhesively connected to the liquid - crystal display panel 110 and affecting the vibration effect of the sound - generating layer 121, and ensure the effective sound generation of the sound - generating layer 121.

[0065] In some other embodiments of the present application, the thickness of the outer edges around the sound - generating layer 121 is greater than the thickness of the inner side of the sound - generating layer 121 to improve the adhesion strength between the sound - generating layer 121 and the liquid - crystal display panel 110 and prevent the sound - generating layer 121 from falling off the liquid - crystal display panel 110 during vibration.

[0066] In some embodiments of the present application, the adhesive layer 150 can be made of acrylate material, which has high viscosity and durability. And since the thickness of the sound - generating layer 121 is 20 microns, the sound - generating layer 121 is relatively thin and has a small vibration amplitude, and the adhesive layer 150 between the sound - generating layer 121 and the liquid - crystal display panel 110 will not fall off due to vibration.

[0067] In some embodiments of the present application, as shown in Figure 1 As shown, the display device 100 further includes a first protective layer 160 and a polarizing layer 170 stacked in sequence. The polarizing layer 170 is disposed on the side of the first protective layer 160 away from the liquid - crystal display panel 110. The above - mentioned sound - generating layer 121 is disposed on the side of the polarizing layer 170 away from the liquid - crystal display panel 110. A closed space is formed between the side of the polarizing layer 170 away from the first protective layer 160 and the sound - generating layer 121, and the polarizing layer 170 is adhesively bonded to the opposite bottom edges of the sound - generating layer 121 through the adhesive layer 150. By forming a closed space between the polarizing layer 170 and the sound - generating layer 121, the water vapor erosion effect can be reduced.

[0068] It can be understood that the polarizing layer 170 can selectively transmit light, and the first protective layer 160 provides physical and chemical protection for the polarizing layer 170.

[0069] In some embodiments of the present application, as shown in Figure 5As shown, the display device 100 further includes a second protective layer 180, which covers the side of the sound - emitting layer 121 away from the liquid - crystal display panel 110. It can cover the groove 1210. By covering the second protective layer 180, the sound - emitting layer 121 and the polarizing layer 170 can be prevented from being eroded by water vapor, providing physical and chemical protection for the sound - emitting layer 121 and the polarizing layer 170.

[0070] It can be understood that the first protective layer 160, the polarizing layer 170, and the second protective layer 180 form an upper polarizer, that is, the sound - emitting layer 121 is disposed inside the upper polarizer. By disposing the sound - emitting layer 121 on the side of the polarizing layer 170 away from the liquid - crystal display panel 110, the sound - emitting layer 121 is closer to the outside of the screen, which can effectively dissipate the heat generated by the vibration of the sound - emitting layer 121 into the air in time, reducing the heat of the sound - emitting layer 121.

[0071] In addition, the second protective layer 180 only covers the surface of the sound - emitting layer 121 without blocking the groove 1210, which can ensure the sound - emitting effect of the sound - emitting layer 121.

[0072] In some embodiments of the present application, the thickness of the second protective layer 180 is 10 microns, which can protect the sound - emitting layer 121 while not affecting the sound effect.

[0073] In other embodiments of the present application, the thickness of the second protective layer 180 can be 9 microns.

[0074] In still other embodiments of the present application, the thickness of the second protective layer 180 can be 11 microns.

[0075] In some embodiments of the present application, both the first protective layer 160 and the second protective layer 180 can be made of triacetyl cellulose (TAC), and the polarizing layer 170 can be made of polyvinyl alcohol (PVA).

[0076] In some embodiments of the present application, referring to Figure 1 and Figure 5 As shown, a photo - spacer array 190 (PSA) is further provided between the first protective layer 160 and the counter substrate 112 to ensure the stability and functional cooperation between the first protective layer 160 and the counter substrate 112, and further ensure the optical alignment between the upper polarizer and the counter substrate 112, reducing light loss.

[0077] In some embodiments of the present application, referring to Figure 1As shown, the display device 100 further includes a control board 1100 and a flexible circuit board 1200. The control board 1100 is disposed at an interval from the liquid crystal display panel 110, and a control chip 1110 for controlling the driving voltages of the first electrode 122 and the second electrode 123 is provided thereon. One end of the flexible circuit board 1200 is connected to the control board 1100, and the other end is connected to the liquid crystal display panel 110. The control chip 1110 is electrically connected to the first electrode 122 and the second electrode 123 through the flexible circuit board 1200 and connection lines respectively, so that different electric voltages are applied to the first electrode 122 and the second electrode 123, and then a driving electric field is formed between the first electrode 122 and the second electrode 123 to drive the sound generating layer 121 to vibrate and generate sound.

[0078] In some embodiments of the present application, the first electrode 122 and the second electrode 123 may be made of transparent indium tin oxide (ITO). It is connected to the circuit on the array substrate 111 through conductive silver paste 1300, and the circuit on the array substrate 111 is electrically connected to the control chip 1110 through the flexible circuit board 1200 to control the first electrode 122 and the second electrode 123 to carry different voltages.

[0079] It should be noted that the array substrate 111 is provided with data lines (not shown in the figure), scan lines (not shown in the figure), and common electrode lines (not shown in the figure). The first electrode 122 and the second electrode 123 may be connected to the data lines, scan lines, or common electrode lines on the array substrate 111, or may be connected by separate connection lines provided on the array substrate 111. As long as the first electrode 122 and the second electrode 123 are applied with opposite electricities, a horizontal driving electric field can be formed between the first electrode 122 and the second electrode 123.

[0080] In some embodiments of the present application, a first conductive line (not shown in the figure) and a second conductive line (not shown in the figure) are arranged at intervals on the array substrate 111, and the first conductive line and the second conductive line are spaced from the data lines, scan lines, and common electrode lines on the array substrate 111 to ensure that the signal transmission on the array substrate 111 will not be interfered. One end of the first conductive line is electrically connected to the first electrode 122 through the conductive silver paste 1300, and the other end is connected to the control chip 1110 on the control board 1100 through the flexible circuit board 1200. One end of the second conductive line is electrically connected to the second electrode 123 through the conductive silver paste 1300, and the other end is connected to the control chip 1110 on the flexible circuit board 1200 to control the first electrode 122 and the second electrode 123 to carry opposite electricities, and a driving electric field is formed between the first electrode 122 and the second electrode 123 to drive the sound generating layer 121 to vibrate.

[0081] It can be understood that the first conductive line and the second conductive line on the array substrate 111 are spaced evenly from the scan line, the data line, and the common electrode line, which can ensure that the lines between the sound - generating part and the liquid - crystal display part are separated from each other, and the sound - generating part and the liquid - crystal display part are independently controlled without interference.

[0082] In some embodiments of the present application, the display device 100 further includes a heat - dissipation layer (not shown in the figure), and the heat - dissipation layer is attached to the control board 1100 to take away the heat generated by the control chip 1110 and reduce the heat of the control board 1100.

[0083] According to Maxwell stress formula, the relationship between the driving voltage of the sound - generating layer 121, thickness, dielectric constant, and elastic modulus is , where V is the driving voltage, d is the initial thickness of the film, Y is the elastic modulus, is the strain ( ), 0 is the vacuum permittivity (8.85x10 - 12F / m), r is the relative dielectric constant of the sound - generating layer 121. Exemplarily, the relative dielectric constant ε r = 50, the elastic modulus Y = 100kPa, the film thickness d = 20 microns. Substituting these values into the formula, we get: V≈100V.

[0084] In some embodiments of the present application, three 30V control chips 1110 (for example, TT30120) can be provided on the control board 1100. The three control chips 1110 are connected in series and are dispersedly designed on the control board 1100 to further reduce the heat generated by the control chip 1110, and thus effectively reduce the heat of the control board 1100.

[0085] In some other embodiments of the present application, a high - voltage chip (for example, EG2104) can be used on the control board 1100. This chip has a small volume, does not occupy much space, and also meets the above - mentioned driving voltage to ensure the sound - generating effect of the sound - generating layer 121.

[0086] It is worth mentioning that according to the dielectric constant r = 50, thickness d = 20μm = 20x10 -6 m, elastic modulus Y≈0.1Mpa = 10 5 pa, strain ε = 5% = 0.05, and the formula = 0 r d 2 , we can obtain V peak≈67V. Therefore, in order to make the sound - generating layer 121 vibrate with a vibration amplitude of 5% and in a sine - wave pattern, an alternating voltage of 0 - 67V with a peak value of ±67 is required to be input, so that the sound - generating layer 121 generates a corresponding vibration frequency and can generate a sine - wave signal with a frequency range of 250Hz - 4000Hz according to a signal generator, enabling the user to hear the sound generated by the vibration of the sound - generating layer 121.

[0087] In this application, the sound - generating structure 120 is directly designed on the liquid - crystal display panel 110, enabling the display device 100 to generate sound without relying on external devices. The display device 100 can achieve a screen - sound - generating technology with low noise and fast response speed. Moreover, the sound - generating structure 120 will not cause the display device 100 to be too thick, ensuring the thin and light nature of the display device 100. In addition, the small - amplitude vibration of the sound - generating layer 121 will not cause the sound - generating layer 121 to fall off and will not affect the deflection of liquid - crystal molecules in the liquid - crystal display panel 110. That is, while ensuring the sound - generating effect, the display effect of the liquid - crystal display panel 110 can also be guaranteed.

[0088] Embodiment Two

[0089] Figure 6 A schematic structural diagram showing the first electrode and the second electrode disposed on the upper and lower sides of the sound - generating layer is shown. Figure 7 A schematic diagram showing the principle of the sound - generating structure is shown.

[0090] The difference between the second embodiment and the first embodiment of this application is that, as shown in Figure 6 and Figure 7 A plurality of longitudinally arranged sound - generating layers 121 are provided between the polarizing layer 170 and the second protective layer 180, and adjacent sound - generating layers 121 are spaced apart from each other. Each sound - generating layer 121 is provided with the above - mentioned groove 1210. The first electrode 122 and the second electrode 123 are respectively disposed on the upper and lower sides of the sound - generating layer 121. When different - polarity voltages are applied to the first electrode 122 and the second electrode 123, a driving electric field with an electric - field direction in the vertical direction is generated between the first electrode 122 and the second electrode 123. Each sound - generating layer 121 can generate a force perpendicular to the electric - field direction under the action of the driving electric field, so as to drive the sound - generating layer 121 in the groove 1210 to vibrate in a direction perpendicular to the electric - field direction, causing the sound - generating layer 121 in the groove 1210 to squeeze the air between adjacent sound - generating layers 121, thereby generating sound waves and then generating sound.

[0091] It is worth mentioning that the first electrode 122 or the second electrode 123 is bonded to the side of the polarizing layer 170 away from the first protective layer 160, that is, a sealed cavity 1220 is not formed with the polarizing layer 170, and only the groove 1210 vibrates to generate sound. The first electrode 122 and the second electrode 123 can also be connected to the first conductive wire and the second conductive wire on the array substrate 111 through the conductive silver glue 1300, so that different electric voltages are applied to the first electrode 122 and the second electrode 123, thereby driving the sounding layer 121 located between the first electrode 122 and the second electrode 123 to vibrate and generate sound.

[0092] In addition, in order to ensure the stability of the sounding layer 121, support columns (not marked in the figure) are provided on the periphery of the sounding layer 121, and the support columns are supported between the first electrode 122 and the second protective layer 180 to ensure the sounding effect of the sounding layer 121.

[0093] In the description of this specification, the descriptions referring to terms such as "some embodiments", "exemplarily", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0094] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and the description of the present application shall fall within the scope covered by the patent of the present application.

Claims

1. A display device, characterized in that, Comprising: A liquid crystal display panel; A sound generating structure disposed on the display side of the liquid crystal display panel. The sound generating structure includes a sound generating layer, and a first electrode and a second electrode disposed on opposite sides of the sound generating layer. The first electrode and the second electrode are used to form a driving electric field between the first electrode and the second electrode according to the voltages applied to both of them. A plurality of grooves are provided on the sound generating layer, and the opening directions of the grooves are perpendicular to the electric field direction of the driving electric field. The adjacent grooves are spaced apart. Each groove includes a first arc segment and a second arc segment connected to each other. The first arc segment is disposed on the side of the second arc segment close to the liquid crystal display panel. The first arc segment is bent away from the liquid crystal display panel, and the second arc segment is bent toward the liquid crystal display panel. And the first arc segment and the second arc segment are tangent to each other at the junction. Wherein, the sound generating layer can generate a force perpendicular to the electric field direction under the action of the driving electric field. The force drives the sound generating layer in the groove to move perpendicular to the electric field direction, so as to drive the air in the groove to vibrate and generate sound.

2. The display device according to claim 1, characterized in that In the direction from the liquid crystal display panel to the sound generating structure, the aperture of the groove gradually increases.

3. The display device according to claim 1, characterized in that, A sealed cavity is formed between the surface of the sound generating layer and the display side of the liquid crystal display panel. The surface of the sound generating layer can move perpendicular to the electric field direction under the action of the force.

4. The display device according to claim 3, wherein The display device further includes an adhesive layer; One side of the sound generating layer facing the liquid crystal display panel is bonded to the liquid crystal display panel through the adhesive layer.

5. The display device according to claim 4, wherein The display device further includes a first protective layer and a polarizing layer stacked in sequence. The polarizing layer is disposed on the side of the first protective layer away from the liquid crystal display panel. The polarizing layer and the sound generating layer form the sealed cavity, and the polarizing layer is bonded to at least two bottom edges of the sound generating layer through the adhesive layer.

6. The display device according to claim 5, wherein The display device further includes a second protective layer, and the second protective layer covers the side of the sound generating layer away from the liquid crystal display panel.

7. The display device according to claim 1, wherein The display device further includes: A control board, which is arranged at an interval from the liquid crystal display panel, and a control chip is provided on the control board; A flexible circuit board. One end of the flexible circuit board is connected to the control board, and the other end is connected to the liquid crystal display panel. The control chip is electrically connected to the first electrode and the second electrode through the flexible circuit board, so that different voltages are applied to the first electrode and the second electrode.

8. The display device according to claim 7, wherein The liquid crystal display panel includes an array substrate arranged oppositely. First conductive wires and second conductive wires are provided on the array substrate at intervals. One end of the first conductive wire is connected to the control chip through the flexible circuit board, and the other end is connected to the first electrode. One end of the second conductive wire is connected to the control chip through the flexible circuit board, and the other end is connected to the second electrode.

9. The display device according to claim 7, wherein The display device further includes a heat dissipation layer, and the heat dissipation layer is attached to the control board.

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