Braille reader

Abstract

The invention provides a braille reader. The braille reader comprises a shell, a control module, at least one microfluidic flow channel system and at least one row of liquid bag structures. The at least one row of liquid bag structure comprises a plurality of liquid bags arranged on the shell at intervals in the length direction of the shell. The microfluidic flow channel system is arranged in the shell and provided with a plurality of liquid injection flow channels communicating with the liquid bags in a one-to-one correspondence mode, and the control module is electrically connected with the microfluidic flow channel system and used for controlling the corresponding liquid injection flow channels to be opened according to received braille alphabet information so as to supply liquid to the corresponding liquid bags; the corresponding liquid bags are made to protrude under the pressure effect of the liquid and form Braille display content corresponding to the Braille information, the liquid bags can reset after pressure relief, and therefore the Braille display function is achieved. The whole braille reader is not provided with a mechanical motion component, so that noise can be avoided to a great extent, the use experience of a user is improved, and the service life of the whole braille reader can be prolonged to a great extent without the mechanical motion component.

Description

Technical Field

[0001] This application relates to the field of Braille reader technology, and more particularly to a Braille reader. Background Technology

[0002] Braille readers are assistive electronic devices that "translate" electronic text or paper Braille into tactile raised dots for visually impaired people to read.

[0003] Currently, mainstream Braille readers primarily use electromagnetic or piezoelectric ceramic actuators to raise and lower the Braille dots, thereby enabling the display of electronic text in Braille. For example, electromagnetically driven Braille readers mainly employ electromagnetic coils to drive magnets to move up and down, which in turn raises and lowers the Braille dots.

[0004] However, current Braille readers generate noise during operation due to the presence of mechanical moving parts such as magnets, which affects the user experience. Summary of the Invention

[0005] The purpose of this application is to provide a Braille reader that addresses the problem of how to reduce the noise generated during the use of a Braille reader.

[0006] This application provides a Braille reader, including a housing, a control module, at least one microfluidic channel system, and at least one row of liquid bladder structure; The at least one row of liquid bladder structures includes a plurality of liquid bladders spaced apart on the outer shell along the length direction of the outer shell; The microfluidic channel system is disposed within the housing and has multiple injection channels that correspond one-to-one with each of the liquid bladders. The control module is electrically connected to the microfluidic channel system and is used to control the corresponding injection channel to open according to the received Braille information to supply liquid to the corresponding liquid bladder, so that the corresponding liquid bladder bulges under the pressure of the liquid and forms Braille display content corresponding to the Braille information. The liquid bladder can be reset after depressurization. In some embodiments, the microfluidic channel system includes at least two control paths intersecting with each of the injection channels, and a pneumatic microvalve for controlling the opening and closing of the injection channels is provided at a portion of all intersection points formed by the control paths and each of the injection channels.

[0007] In some embodiments, the pneumatic microvalve includes a substrate, a cover plate located above the substrate, and a thin film disposed between the substrate and the cover plate. A first flow path communicating with the liquid injection channel is provided on the side of the cover plate facing the substrate, and a second flow path communicating with the control passage is provided on the side of the substrate facing the cover plate. The thin film can deform under external air pressure to close the first flow path.

[0008] In some embodiments, the microfluidic channel system further includes a pneumatic system disposed within the housing and connected to the microfluidic channel system. The pneumatic system is electrically connected to the control module and is used to supply air to the corresponding control path under the control of the control module to deform the membrane to close the first flow path, or to reset the membrane after depressurization to open the first flow path.

[0009] In some embodiments, of all the pneumatic microvalves in each of the control paths, at least one of the pneumatic microvalves is a high-pressure valve, and at least another of the pneumatic microvalves is a low-pressure valve; the high-pressure valve operates in a pressure range of 200 mbar to 400 mbar, and / or the low-pressure valve operates in a pressure range of 0 mbar to 100 mbar.

[0010] In some embodiments, the Braille reader further includes a liquid pump structure disposed within the housing and connected to the microfluidic channel system. The liquid pump structure is electrically connected to the control module and is used to pump liquid into the liquid bladder through the injection channel under the control of the control module.

[0011] In some embodiments, the outer surface of the liquid bladder is provided with a polymer coating layer; And / or, the liquid includes water, oil, or a complex liquid of water and additives; And / or, the liquid bladder is made of a flexible polymer material; And / or, the number of liquid sacs in each of the liquid sac structures ranges from 12 to 40; And / or, the liquid bladder structure is configured in multiple rows, with the multiple rows of liquid bladder structures spaced apart along the width direction of the outer shell, and the number of rows of the liquid bladder structure is no more than 6.

[0012] In some embodiments, the control module is used to connect wirelessly or wiredly to an external device, and the control module is configured to receive text information input by the external device and convert the text information into Braille information; And / or, the control module includes a processor, a memory, and a control circuit, wherein the processor and the memory, as well as the processor and the microfluidic channel system, are electrically connected through the control circuit.

[0013] In some embodiments, the Braille reader further includes control buttons disposed on the housing, the control buttons being communicatively connected to the control module; And / or, the Braille reader further includes a power supply element electrically connected to the control module to supply power to the control module.

[0014] The beneficial effects of this invention are: This application provides a Braille reader, including a housing, a control module, at least one microfluidic channel system, and at least one row of liquid bladder structures. The at least one row of liquid bladder structures includes multiple liquid bladders spaced apart along the length of the housing. The microfluidic channel system is disposed within the housing and has multiple injection channels corresponding to and communicating with each liquid bladder. The control module is electrically connected to the microfluidic channel system and is used to control the opening of the corresponding injection channels according to received Braille information to supply liquid to the corresponding liquid bladders. This causes the corresponding liquid bladders to bulge under liquid pressure, forming Braille display content corresponding to the Braille information. The liquid bladders can reset after depressurization, thereby realizing the Braille display function. Compared to using the movement of mechanical moving parts to raise and lower the Braille dots for display, the Braille reader of this application controls the bulging of the liquid bladders through liquid supply, thus achieving Braille display. The entire Braille reader has no mechanical moving parts, therefore, noise can be largely avoided, improving the user experience. Furthermore, the absence of mechanical moving parts also significantly extends the overall lifespan of the Braille reader. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the Braille reader shown in the embodiments of this application; Figure 2 This is a schematic diagram showing the distribution of the flow channels and pneumatic micro-valve in the Braille reader shown in the embodiments of this application; Figure 3 This is a schematic diagram of the pneumatic microvalve of the Braille reader shown in the embodiments of this application; Figure 4 This is a schematic diagram of the circuit structure of the Braille reader shown in the embodiment of this application.

[0017] Figure label: 100. Outer shell; 200. Control module; 210. Processor; 220. Memory; 300. Microfluidic channel system; 310. Injection channel; 320. Control path; 321. First control path; 322. Second control path; 323. Third control path; 324. Fourth control path; 400. Liquid bladder structure; 410. Liquid bladder; 500. Pneumatic microvalve; 510. Substrate; 520. Cover plate; 521. First flow path; 522. Second flow path; 540. High-pressure valve; 550. Low-pressure valve; 600. Pneumatic system; 700. Liquid pump structure; 800. Control buttons; 900. Power supply components. Detailed Implementation

[0018] In the embodiments of this application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of that feature.

[0019] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0020] Reference Figures 1 to 4 As shown, this embodiment provides a Braille reader, including a housing 100, a control module 200, at least one microfluidic channel system 300, and at least one row of liquid bladder structures 400.

[0021] The at least one row of liquid bladder structure 400 includes a plurality of liquid bladders 410 spaced apart along the length of the housing 100 on the housing 100.

[0022] The microfluidic channel system 300 is disposed inside the housing 100 and has multiple injection channels 310 that correspond one-to-one with each liquid sac 410. The control module 200 is electrically connected to the microfluidic channel system 300 and is used to control the corresponding injection channel 310 to open according to the received Braille information to supply liquid to the corresponding liquid sac 410, so that the corresponding liquid sac 410 bulges under the pressure of the liquid and forms Braille display content corresponding to the Braille information. The liquid sac 410 can be reset after depressurization. In practical implementation, the Braille reader can be equipped with a single-line liquid sac structure 400 or other features such as... Figure 1 The multi-row liquid bladder structure 400 shown facilitates the display of rich Braille content.

[0023] Each row of liquid sac structure 400 includes multiple liquid sacs 410, the multiple liquid sacs 410 along... Figure 1 The x-axis spacing is shown. For example, a row of 400 fluid-filled bladder structures can be used as an example. Figure 2 The 19 liquid sacs 410 shown can also be set to 30 or other numbers.

[0024] In this embodiment, in order to realize the Braille display, the protrusion or reset of the liquid bladder 410 needs to be set to be independently controlled. For this purpose, this embodiment sets the microfluidic channel system 300 to be electrically connected to the control module 200, so that any one of the injection channels 310 can be opened individually according to the received Braille information to supply liquid to the liquid bladder 410 corresponding to the injection channel 310, so that the liquid bladder 410 protrudes under the action of liquid pressure. When the liquid supply is finished, the liquid bladder 410 can be reset after depressurization to return to the non-protruding state.

[0025] For example, Braille information can be existing Braille, Chinese double-pinyin Braille, and English Braille, etc.

[0026] The Braille reader in this embodiment controls the protrusion of the liquid bladder 410 by supplying liquid to it, thereby enabling Braille display. The entire Braille reader has no mechanical moving parts, which can largely avoid noise generation, thus improving the user experience. The absence of mechanical moving parts can also greatly extend the service life of the entire Braille reader. Reference Figure 1 and Figure 2 As shown, in some embodiments, the microfluidic channel system 300 includes at least two control paths 320 that intersect with each injection channel 310, and a pneumatic microvalve 500 for controlling the opening and closing of the injection channel 310 is provided at some of the intersections formed by the control paths 320 and each injection channel 310.

[0027] In practice, in order to display rich Braille information, a large number of liquid bladders 410 are set. If each liquid bladder 410 is equipped with a control path to control the opening and closing of the liquid injection channel 310, it will result in thousands of channels in the entire Braille reader, making the structure of the entire liquid injection channel 310 extremely complex.

[0028] Therefore, in this embodiment, a liquid injection channel 310 and at least two control paths 320 intersecting with the liquid injection channel 310 are provided. At some of the intersection points of the control paths 320 and each liquid injection channel 310, a pneumatic micro-valve 500 for controlling the opening and closing of the liquid injection channel 310 is provided, thereby forming a multiplexer, that is, forming a valve array that uses a small number of control paths 320 to switch a large number of liquid injection channels 310. This enables the control of multiple liquid bladders 410 with fewer control paths 320, thereby achieving a simplified design of the entire internal channel. At the same time, it can reduce costs and achieve a miniaturized design of the entire Braille reader, so that the Braille reader is small and easy to carry.

[0029] For example, refer to Figure 2 As shown, taking a row of 19 liquid bladder structures 400 as an example, four control paths 320 can be set up, specifically the first control path 321, the second control path 322, the third control path 323, and the fourth control path 324. Each control path 320 can be equipped with 13 pneumatic microvalves 500. By controlling the working state of the pneumatic microvalves 500 in different control paths 320, individual control of each injection channel 310 can be achieved.

[0030] By reasonably setting the number of control channels 320, multiple injection channels 310 can be switched on and off with fewer control channels 320, thereby simplifying the design of the entire internal channel. For details, please refer to the principle introduction of multiplexers in related technologies.

[0031] For example, refer to Figure 2 As shown, a row of liquid bladder structures 400 can be set to 19, and at this time, the control channels 320 can be set to 4.

[0032] Reference Figures 1 to 4 As shown, in some embodiments, the pneumatic microvalve 500 includes a substrate 510, a cover plate 520 located above the substrate 510, and a thin film disposed between the substrate 510 and the cover plate 520. A first flow path 521 communicating with the liquid injection channel 310 is provided on the side of the cover plate 520 facing the substrate 510, and a second flow path 522 communicating with the control passage 320 is provided on the side of the substrate 510 facing the cover plate 520.

[0033] In a specific implementation, the substrate 510 and the cover plate 520 are attached together. The side of the cover plate 520 facing the substrate 510 is provided with a first flow path 521 that connects to the liquid injection channel 310, while the side of the substrate 510 facing the cover plate 520 is provided with a second flow path 522 that connects to the control passage 320. A thin film is provided between the two to form a pneumatic micro valve 500. When the thin film is deformed under the action of external air pressure or other pressure, it can be pressed into the first flow path 521 to close the liquid injection channel 310, and can be reset and reopened after the external pressure is released.

[0034] For example, the materials of the substrate 510 and the cover plate 520 include, but are not limited to, PMMA (polymethyl methacrylate), PC (polycarbonate), PDMS (polydimethylsiloxane), and PP (polypropylene), and the material of the shell 100 is not limited to PC and PP. The material of the film can be PDMS.

[0035] Reference Figures 1 to 4 As shown, in some embodiments, the microfluidic channel system 300 further includes a pneumatic system 600, which is disposed inside the housing 100 and communicates with the microfluidic channel system 300. The pneumatic system 600 is electrically connected to the control module 200 and is used to supply air to the corresponding control path 320 under the control of the control module 200 to deform the film to close the injection channel 310, or to reset the film after depressurization to open the injection channel 310.

[0036] In practice, when liquid needs to be supplied to a specific liquid bladder 410, the control module 200 controls the pneumatic system 600 to supply air to the control passage 320 corresponding to other liquid bladders 410, causing the membrane in the injection channel 310 to deform and close the injection channel 310. The membrane in the injection channel 310 corresponding to the specific liquid bladder 410 is not subject to gas pressure, thereby opening the injection channel 310, allowing external liquid to flow into the specific liquid bladder 410 through the injection channel 310.

[0037] For example, the pneumatic system 600 can be an air pump or an air tank. In this embodiment, the pneumatic system 600 is set as an air pump, and the pressure of the air pump is constant at 200 mba.

[0038] In some embodiments, of all the pneumatic microvalves 500 in each control passage 320, at least one pneumatic microvalves 500 is a high-pressure valve 540, and at least another pneumatic microvalves 500 is a low-pressure valve 550; the operating pressure range of the high-pressure valve 540 is 200 mbar-400 mbar, and / or the operating pressure range of the low-pressure valve 550 is 0 mbar-100 mbar.

[0039] By setting high-pressure valve 540 and low-pressure valve 550, the control passage 320 can have two states: high pressure and low pressure, so as to independently control the individual on / off state of all injection channels 310.

[0040] For example, refer to Figure 2 As shown, taking 19 liquid bladders 410 and four control channels 320 as an example, the setting position and number of high-pressure valves and low-pressure valves on each control channel 320 are explained.

[0041] The following diagram illustrates the working state of the high-pressure valve and low-pressure valve on each control path 320 when each liquid bladder 410 is in the convex state, taking 19 liquid bladders 410 and four control paths 320 as an example.

[0042]

[0043] For example, for the liquid bladder 410 (serial number 2), its protrusion condition is: the operating states of the pneumatic microvalves 500 in the four control paths are high-low-low-0, respectively. At the node where the first control path 321 intersects with the liquid bladder 410 (serial number 2), there is no pneumatic microvalves 500, and the high pressure has no effect; therefore, this intersection is open. (Refer to...) Figure 2 As shown, a high-pressure valve 540 is installed at the intersection of the second control path 322 and the third control path 323 from the top. Since both are in low-pressure working states, this has no effect, and therefore this intersection is also open. The fourth control path 324 at the bottom has zero pressure, so this intersection is also open. Therefore, the liquid bladder 410 with serial number 2 is inflated or bulging. The bulging conditions for the other liquid bladders 410 are understood similarly and will not be explained in detail here. Additionally, it should be noted that under the high-low-low-0 control signal, only the liquid bladder 410 with serial number 2 is open; all other liquid bladders 410 are closed, thus achieving individual control of the liquid bladder 410.

[0044] Specifically, the number of control channels 320 is equal to log2n, where n is the number of injection channels 310.

[0045] Taking an example where there are 19 fluid-filled sacs 410 and four control pathways 320, the explanation from the perspective of permutation and combination is as follows: Case 1) All four control paths are set to low-pressure (50 kPa for example) operation. The number of control pressure combinations is: C(4,4) = 1 The only combination is: (C1:50 kPa, C2:50 kPa, C3:50 kPa, C4:50 kPa).

[0046] Case 2) One control path operates at high pressure (100 kPa is used as an example for explanation), and the other two control paths operate at 50 kPa.

[0047] First, select 2 out of the 4 as the control pathways for 50 kPa: C(4,2) = 6.

[0048] Then select one control path from the remaining two control paths as the 100 kPa control path: C(2,1) = 2. Therefore, the total number of combinations is: C(4,2) × C(2,1) = 6 × 2 = 12.

[0049] Case 3) The operating state of the two control paths is 100 kPa.

[0050] At this point, two control paths need to be selected as 100 kPa, and each 100 kPa control path must simultaneously provide 50 kPa. The number of combinations is: C(4,2) = 6 In total: 1 (case 1) + 12 (case 2) + 6 (case 3) = 19 controllable pressure combinations, thus enabling independent control of 19 fluid bladders.

[0051] In this embodiment, refer to Figure 2 As shown, there are a total of 13 pneumatic microvalves on each control path 320. Among them, 7 are high-pressure valves and 6 are low-pressure valves. The specific number of high-pressure valves and low-pressure valves, as well as the total number, are determined based on the number of liquid bladders and control paths, combined with the setting principle of the multiplexer.

[0052] Reference Figure 1 and Figure 4 As shown, in some embodiments, the Braille reader also includes a liquid pump structure 700, which is disposed inside the housing 100 and connected to the microfluidic channel system 300. The liquid pump structure 700 is electrically connected to the control module 200 and is used to pump liquid into the liquid bladder 410 through the injection channel 310 under the control of the control module 200.

[0053] In practice, when liquid needs to be supplied to a specific liquid bladder 410, the control module 200 controls the flow channel to be unobstructed, and then controls the liquid pump structure 700 to pump the external liquid into the liquid bladder 410 through the flow channel, thereby realizing the protrusion of the specific liquid bladder 410 and thus realizing the Braille display function.

[0054] For example, the liquid pump structure 700 may specifically include a liquid storage container for storing liquid and a liquid pump disposed within the liquid storage container. The liquid pump is electrically connected to the control module 200 to pump the liquid in the liquid storage container into the corresponding flow channel under the pressure of the liquid pump. The pressure of the liquid pump can be adjusted between 0-400 mbar.

[0055] In some embodiments, the outer surface of the liquid bladder 410 is provided with a polymer coating layer, so that the liquid bladder 410 can make comfortable contact with the human finger without affecting the touch efficiency.

[0056] For example, the materials of the polymer coating layer include, but are not limited to, polymer materials such as PET (polyethylene terephthalate), TPU (thermoplastic polyurethane), and PP.

[0057] For example, the liquid includes water, oil, or a composite liquid of water and additives, as long as it can achieve the purpose of protruding the liquid bladder 410 when injected into it. Additives may be antibacterial agents or surfactants. Surfactants include, but are not limited to, surfactant materials such as SPAN80 and Tween60. SPAN80 is an abbreviation for Sorbitan Monooleate, a nonionic surfactant commonly used for emulsifying, dispersing, and stabilizing water-oil systems. Tween 60 is an abbreviation for Polyoxyethylene-20-sorbitan monostearate, a nonionic surfactant belonging to the polysorbate class. Antibacterial agents include, but are not limited to, biological enzyme preparations and anionic antibacterial agents.

[0058] For example, the liquid can be prepared by adding SPAN80 and anionic antibacterial agent to 1 ml of pure water to form an aqueous solution.

[0059] For example, the liquid bladder 410 is made of a flexible polymer material, which makes it easy to bulge under liquid pressure and easy to return to its original position after pressure relief. For example, the flexible polymer material includes, but is not limited to, silicone and thermoplastic plastics.

[0060] For example, the number of liquid sacs 410 in each liquid sac structure 400 ranges from 12 to 40. By reasonably setting the number of liquid sacs 410, it is possible to display rich Braille information. For example, a row of liquid sac structures 400 can be provided with 19 liquid sacs 410, or 30 or 40 liquid sacs 410.

[0061] For example, the liquid bladder structure 400 is configured in multiple rows, with the multiple rows of liquid bladder structures 400 spaced apart along the width direction of the outer shell 100. The number of rows of liquid bladder structures 400 is no more than 6, so as to realize the display function of rich Braille information while ensuring that the overall size or volume of the Braille reader is within a preset range, so as to facilitate use and carrying.

[0062] For example, the total number of liquid sacs 410 in a Braille reader can be between 72 and 1440.

[0063] Reference Figure 1 and Figure 4 As shown, in some embodiments, the control module 200 is used to connect wirelessly or wiredly to an external device, and the control module 200 is configured to receive text information input by the external device and convert the text information into Braille information, so that the text information can be finally displayed in Braille through the liquid bladder 410, so that visually impaired users can obtain the text information on the external device.

[0064] For example, an external device could be a mobile phone or a computer.

[0065] Specifically, the control module 200 includes a processor 210, a memory 220, and a control circuit. The processor 210 and the memory 220, as well as the processor 210 and the microfluidic channel system 300, are electrically connected through the control circuit, thereby realizing functions such as text information processing, conversion, and storage.

[0066] Reference Figure 1 and Figure 4 As shown, in some embodiments, the Braille reader also includes control buttons 800 disposed on the housing 100. The control buttons 800 are communicatively connected to the control module 200, thereby enabling the control operation functions of the entire Braille reader.

[0067] For example, control button 800 can be a power button, allowing the Braille reader to be switched on and off. Alternatively, control button 800 can function as a battery level indicator, providing voice prompts to indicate the battery level. The specific function of control button 800 can be configured according to actual needs.

[0068] Specifically, the Braille reader also includes a power supply element 900, which is electrically connected to the control module 200 to supply power to the control module 200.

[0069] For example, the power supply element 900 can be a battery or a charging interface that can be connected to an external power source.

[0070] In summary, the working process of the Braille reader in this embodiment is as follows: First, the control module 200 converts the text content to be displayed into Braille content. Then, it is laid out according to the size of the reader. After the layout is completed, the air pump controls the opening and closing of the pneumatic micro-valve corresponding to each liquid bladder. The flow pump pumps fluid into the liquid bladder with the flow channel open, and specific liquid bladders bulge to form Braille display.

[0071] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0072] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A Braille reader, characterized in that, It includes a housing (100), a control module (200), at least one microfluidic channel system (300), and at least one row of liquid bladder structures (400). The at least one row of liquid bladder structures (400) includes a plurality of liquid bladders (410) spaced apart on the housing (100) along the length direction of the housing (100). The microfluidic channel system (300) is disposed within the housing (100) and has a plurality of injection channels (310) that correspond one-to-one with each of the liquid sacs (410). The control module (200) is electrically connected to the microfluidic channel system (300) and is used to control the corresponding injection channel (310) to open according to the received Braille information to supply liquid to the corresponding liquid sac (410), so that the corresponding liquid sac (410) bulges under the pressure of the liquid and forms Braille display content corresponding to the Braille information, and the liquid sac (410) can be reset after depressurization.

2. The Braille reader according to claim 1, characterized in that, The microfluidic channel system (300) includes at least two control paths (320) that intersect with each of the injection channels (310), and a pneumatic microvalve (500) for controlling the opening and closing of the injection channels (310) is provided at some of the intersections formed by the control paths (320) and each of the injection channels (310).

3. The Braille reader according to claim 2, characterized in that, The pneumatic microvalve (500) includes a substrate (510), a cover plate (520) located above the substrate (510), and a thin film disposed between the substrate (510) and the cover plate (520); The cover plate (520) has a first flow path (521) connected to the liquid injection channel (310) on the side facing the substrate (510), and the substrate (510) has a second flow path (522) connected to the control passage (320) on the side facing the cover plate (520). The film can be deformed under external air pressure to close the first flow path (521).

4. The Braille reader according to claim 3, characterized in that, The microfluidic channel system (300) further includes a pneumatic system (600), which is located inside the housing (100) and communicates with the microfluidic channel system (300); The pneumatic system (600) is electrically connected to the control module (200) and is used to supply air to the corresponding control passage (320) under the control of the control module (200) to deform the film and close the first flow path (521).

5. The Braille reader according to claim 2, characterized in that, Each of the pneumatic microvalves (500) in each of the control paths (320) includes at least one high-pressure valve (540) and at least one low-pressure valve (550). The high-pressure valve (540) has an operating pressure range of 200 mbar to 400 mbar, and / or the low-pressure valve (550) has an operating pressure range of 0 mbar to 100 mbar.

6. The Braille reader according to claim 1, characterized in that, The Braille reader also includes a liquid pump structure (700), which is located inside the housing (100) and connected to the microfluidic channel system (300). The liquid pump structure (700) is electrically connected to the control module (200) and is used to pump liquid into the liquid bladder (410) through the injection channel (310) under the control of the control module (200).

7. The Braille reader according to claim 1, characterized in that, The outer surface of the liquid bladder (410) is provided with a polymer coating layer; And / or, the liquid includes water, oil, or a complex liquid of water and additives; And / or, the liquid bladder (410) is made of a flexible polymer material.

8. The Braille reader according to claim 1, characterized in that, The number of liquid sacs (410) in each of the liquid sac structures (400) ranges from 12 to 40; And / or, the liquid bladder structure (400) is configured in multiple rows, the multiple rows of liquid bladder structures (400) are spaced apart along the width direction of the outer shell (100), and the number of rows of liquid bladder structures (400) is no more than 6.

9. The Braille reader according to claim 1, characterized in that, The control module (200) is used to connect wirelessly or wiredly to an external device, and the control module (200) is configured to receive text information input by the external device and convert the text information into Braille information; And / or, the control module (200) includes a processor (210), a memory (220) and a control circuit, wherein the processor (210) and the memory (220) and the processor (210) and the microfluidic channel system (300) are electrically connected through the control circuit.

10. The Braille reader according to claim 1, characterized in that, The Braille reader also includes control buttons (800) disposed on the housing (100), and the control buttons (800) are communicatively connected to the control module (200); And / or, the Braille reader further includes a power supply element (900) electrically connected to the control module (200) to supply power to the control module (200).

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