Visual piano teaching aid and control system thereof

Abstract

The invention discloses a visual piano teaching aid and a control system thereof, and belongs to the technical field of pianos. The visual piano teaching aid comprises a piano body, the piano body comprises a transparent soundboard cover plate, a transparent soundboard, a transparent keyboard cover plate and a transparent music stand plate; the transparent soundboard cover plate, the transparent soundboard, the transparent keyboard cover plate and the transparent music stand plate are all made of optical-grade materials with the light transmittance larger than or equal to 60% and used for replacing non-transparent parts corresponding to the piano, and therefore the internal mechanical structure of the piano is visualized. According to the system, the complete visualization of the internal mechanical structure of the piano is realized through the high-transparency component with the light transmittance being greater than or equal to 60%, and unprecedented visual experience is brought to piano teaching. A learner can clearly observe a hammer string striking process corresponding to each key, a precise linkage mechanism of a string striking machine and a vibration transmission path of a soundboard, and the visual teaching mode can help the learner to deeply understand a sounding principle and key touch skills of a piano.

Description

Technical Field

[0001] This invention belongs to the field of piano technology, specifically relating to a visual piano teaching aid and its control system. Background Technology

[0002] Piano teaching aids are a collective term for various tools and equipment used to assist in piano teaching and learning. Their core purpose is to make abstract music theory, playing techniques, and musical perception more intuitive and operable, thereby improving teaching efficiency and learning interest. They go beyond traditional sheet music and metronomes, encompassing everything from basic fingering trainers and interactive apps to professional digital pianos, mute systems, pitch meters, and even advanced AI-powered intelligent error correction and visual feedback systems. These tools together form a multi-dimensional learning support environment that helps learners more scientifically establish correct muscle memory, pitch concepts, and musical expression abilities.

[0003] Existing piano teaching aids typically only allow for simple performances and lack sufficient interactivity and visualization. These traditional teaching aids often only display basic notes and rhythms, failing to effectively attract students' attention and stimulate their learning interest. Meanwhile, the transparent soundboard cover, keyboard cover, and music stand are all non-transparent parts, hindering users from observing the operation of core mechanical structures such as the action and hammers, which is not conducive to teaching demonstrations and mechanical maintenance. Furthermore, the color and texture of traditional piano shells are fixed and cannot be dynamically adjusted according to usage scenarios or personal preferences, lacking personalized expression. They only provide acoustic performance functions and do not integrate visual interactive elements (such as dynamic lighting and projection), making it difficult to meet the diverse needs of modern stage performances and immersive music education. Another example is a Chinese patent with publication number CN209641330U, which, although designed with partially transparent windows, cannot fully observe the internal mechanical structure, the components are not fully covered, and it is not compatible with electronic display and light and shadow linkage systems.

[0004] Therefore, a visual piano teaching aid and its control system are proposed to solve the above problems. Summary of the Invention

[0005] In view of one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a visual piano teaching aid and its control system, which has the advantages of improving learning effect, enhancing interactive experience, and flexible maintenance.

[0006] To achieve the above objectives, the present invention provides a visual piano teaching aid, including a piano body; The piano body includes a transparent soundboard cover, a transparent soundboard, a transparent keyboard cover, and a transparent music stand. The transparent soundboard cover, transparent soundboard, transparent keyboard cover, and transparent music stand are all made of transparent optical grade materials and are used to replace the corresponding non-transparent parts of the piano, making the internal mechanical structure of the piano visible. The transparent soundboard cover is 11mm thick, the transparent keyboard cover is 30mm thick, and the shape, outline, installation interface, and fixing point position of all transparent components are completely matched with the corresponding components of the original piano. The piano body has a sound cavity, a triangular support is installed inside the sound cavity, and a projector is installed on the upper end of the triangular support and the projector is tilted.

[0007] As a further improvement of the present invention, the light transmittance of the transparent component material is measured at a wavelength of 550 nm according to the ASTM D1003 standard, and the light transmittance is ≥60%. The test environment conditions are a temperature of 23±2℃ and a relative humidity of 50±5%. An integrating sphere light transmittance meter is used for precise measurement, and the measurement accuracy reaches ±0.1%.

[0008] As a further improvement of the present invention, the transparent component is made of optical grade polycarbonate PMMA acrylic or tempered glass, wherein the optical grade polycarbonate has an impact strength of 60% J / m and a temperature resistance range of -40℃ to +120℃.

[0009] As a further improvement of the present invention, an optional display screen assembly is also included. The display screen assembly removes the backlight of the traditional LCD display screen, retains the liquid crystal panel module, adopts the MIPI-DSI4 channel interface standard, and has dual working states of display mode and transparent mode. In display mode, the light transmittance is maintained at more than 60%, and in transparent mode, the overall light transmittance is ≥30%. The display screen is attached to the rear surface of the transparent component.

[0010] As a further improvement of the present invention, a lighting system is also included. The lighting system adopts a programmable full-color LED light strip with WS2812B protocol, which is installed on the inner side of the soundboard support beam inside the piano and connected through a JSTSM 3pin connector. It supports PWM pulse width modulation stepless dimming, with a brightness adjustment range of 0-100% and color adjustment supporting 15.77 million colors of the full spectrum. The lighting and music are synchronized by collecting audio signals through a sound sensor.

[0011] As a further improvement of the present invention, a color-changing electronic film 3 is also included. The color-changing electronic film 3 adopts electrophoretic display technology, with a film thickness of 0.3-0.5mm. It adopts a segmented design and is attached to the piano soundboard shell. The size of each segment is controlled within 200mm×300mm. It is connected to the main control board through a standardized SPI interface, supports 15-bit color value data transmission, has a driving voltage range of 0-15V, and a response time of <200ms. It can achieve autonomous color-changing effects according to ambient light, touch signals, or music beats.

[0012] Based on this, the present invention also provides a control system, which includes a main control chip, and an electronic film driver, a transparent display screen, an LED light strip, a projector, a sound sensor and an infrared sensor, which are electrically connected to the main control chip respectively.

[0013] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include: The present invention relates to a visual piano teaching aid and its control system. 1. This system achieves complete visualization of the piano's internal mechanical structure through high-transparency components with a light transmittance of ≥60%, bringing an unprecedented intuitive experience to piano teaching. Learners can clearly observe the hammer striking process corresponding to each key, the precise linkage mechanism of the action, and the vibration transmission path of the soundboard. This visual teaching method helps learners gain a deeper understanding of the piano's sound production principles and touch techniques. Music teachers can observe the response of the internal mechanisms during a learner's performance to accurately diagnose technical problems such as touch force, finger independence, and pedal use, enabling more precise technical guidance.

[0014] 2. The optional display screen component can intelligently switch between transparent mode and display mode, maintaining the integrity and visibility of the internal structure while displaying teaching aids such as sheet music, fingering prompts, and performance analysis in real time, greatly improving teaching and learning efficiency. The optional design enhances the user experience: users can choose the most suitable configuration mode according to the actual usage scenario, such as home practice, stage performance, or teaching explanation, gaining unprecedented flexibility.

[0015] 3. The transparent design greatly facilitates the maintenance of the piano. Technicians can directly observe the internal mechanical status through the transparent parts and quickly diagnose key parameters such as action adjustment, string tension, and soundboard condition. Most repair work can be completed without disassembling the outer casing, significantly reducing maintenance costs and time costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall installation structure of the present invention; Figure 2 This is a schematic diagram of the installation structure of the projector of the present invention on the piano body; Figure 3 This is a structural schematic diagram of a transparent component that replaces an upright piano according to one embodiment of the present invention; Figure 4 This is a schematic diagram of the overall installation framework of the control system circuit of the present invention; Figure 5 This is a schematic diagram of the overall installation framework of the control system circuit of the present invention.

[0017] In all the accompanying drawings, the same reference numerals indicate the same technical features, specifically: 1. Piano body; 11. Transparent soundboard cover; 12. Transparent soundboard; 13. Transparent keyboard cover; 14. Transparent music stand; 15. Triangular support; 2. Projector; 3. Color-changing electronic film. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] First embodiment; Reference Figure 1-2 As shown, a visual piano teaching aid and its control system are provided in a preferred embodiment of the present invention, including a piano body 1; The piano body 1 includes a transparent soundboard cover 11, a transparent soundboard 12, a transparent keyboard cover 13, and a transparent music stand 14; The transparent soundboard cover 11, transparent soundboard 12, transparent keyboard cover 13 and transparent music stand 14 are all made of transparent optical grade material and are used to replace the corresponding non-transparent parts of the piano, making the internal mechanical structure of the piano visible. Among them, the transparent soundboard cover 11 is 11mm thick, the transparent keyboard cover 13 is 30mm thick, and the shape, outline, installation interface, and fixing point position of all transparent parts are completely matched with the corresponding parts of the original piano. The piano body 1 has a sound cavity, and a triangular support 15 is installed inside the sound cavity. A projector 2 is installed on the upper end of the triangular support 15 and the projector 2 is tilted.

[0020] In this embodiment, transparent soundboard cover 11, transparent soundboard 12, transparent keyboard cover 13, and transparent music stand 14 are made of optical-grade materials with a light transmittance equal to or greater than 60%, achieving a precise one-to-one replacement of traditional piano's non-transparent parts. These transparent parts are made of optical-grade carbonated PC, PMMA acrylic, or tempered glass, and their light transmittance performance is strictly tested at a wavelength of 550nm according to the ASTM D1003 standard to ensure that they meet the light transmittance requirement of over 60%. The transparent soundboard cover 11 is designed to be 11mm thick, and the transparent keyboard cover 13 is 30mm thick, ensuring sufficient structural strength to withstand a 50J impact without cracking, meeting the ISO 179 standard, while maintaining excellent optical performance. The shape, outline, mounting interface, and fixing point position of all transparent parts are completely matched with the corresponding parts of the original piano, ensuring that they can be perfectly integrated into the overall structure of the piano after installation, without affecting the piano's acoustic transmission characteristics and mechanical stability.

[0021] Furthermore, after installation, users can directly observe the operation of the core mechanical structures inside the piano, such as the action, hammers, strings, and soundboard, through the transparent components. This provides an unprecedented visual experience for piano teaching, mechanical maintenance, and artistic display. At the same time, all transparent components are coated with a UV protective layer, with an anti-yellowing rating of ΔY < 51,000 hours of UV aging testing, ensuring that they maintain excellent transparency and appearance quality even after long-term use.

[0022] It should be noted that the piano body 1 of this application is included in the appendix of the embodiments. Figure 1 and attached Figure 2 Examples of transparent, replaceable parts are shown, including those for grand pianos and upright pianos. The transparent parts can be replaced accordingly, depending on the piano's construction.

[0023] Based on this, the present invention also provides a control system, which includes a main control chip, and an electronic film driver, a transparent display screen, an LED light strip, a projector, a sound sensor, and an infrared sensor, all electrically connected to the main control chip. See the attached specific embodiments. Figure 4-5 The application provides a control system circuit installation framework, in which the ESP32-S3 chip is preferably used as the main control chip of the invention. In use, the specific chip models such as ESP32-S3 mentioned in this invention are only illustrative examples, and any equivalent controller that achieves the same function is within the scope of protection of this patent.

[0024] Furthermore, in a specific embodiment, this application provides an electronic control system interface specification, as shown in the appendix to the embodiment. Figure 4 As shown, wherein, according to the appendix Figure 4 As shown, the connection interface parameters in this application are as follows:

[0025] Second embodiment; Reference Figure 1-3 As shown, the light transmittance of the transparent component material was measured at a wavelength of 550 nm according to the ASTM D1003 standard. The light transmittance was ≥60%. The test environment conditions were a temperature of 23±2℃ and a relative humidity of 50±5%. An integrating sphere light transmittance meter was used for precise measurement, and the measurement accuracy reached ±0.1%.

[0026] In this embodiment, the transmittance technical specification of the transparent component material is further refined to a stringent requirement of ≥60%, and precise measurement is explicitly performed at a wavelength of 550nm using the ASTM D1003 standard. This wavelength selection is based on the peak range of the human eye's visual sensitivity curve, ensuring that the test results accurately reflect the human eye's observation effect. During the transmittance test, the sample must be placed under standard environmental conditions (temperature 23±2℃, relative humidity 50±5%) for 24 hours before measurement. An integrating sphere transmittance meter is used, with a standard D65 light source and a silicon photodiode detector, achieving a measurement accuracy of ±0.1%. For transparent components of different thicknesses, the transmittance requirement remains consistent: ≥60% transmittance for the 11mm thick component in the soundboard area, ≥60% transmittance for the 30mm thick component in the keyboard cover area, and ≥60% transmittance for the music stand area. Optical-grade polycarbonate (PC) is the preferred material choice, with a refractive index of 1.586 and an Abbe number of 30, exhibiting excellent optical uniformity and mechanical strength. PMMA acrylic, an alternative material, has a refractive index of 1.491 and an Abbe number of 57, with a light transmittance of over 92%. Tempered glass is a high-end option, with a light transmittance of over 91%, but it is relatively heavy and difficult to process.

[0027] Third embodiment; Reference Figure 1-2 As shown, the transparent components are made of optical-grade polycarbonate PMMA acrylic or tempered glass. The optical-grade polycarbonate has an impact strength of 60% J / m and a temperature range of -40℃ to +120℃.

[0028] In this embodiment, the material selection covers three main categories: optical-grade polycarbonate (PC), PMMA acrylic, and tempered glass. Each material has specific application advantages and technical parameters. Optical-grade PC has excellent impact resistance, with an impact strength of up to 60% J / m, and good temperature resistance from -40℃ to +120℃, making it particularly suitable for the temperature and humidity variations inside a piano. Its processing performance is excellent, allowing for the precise manufacture of complex curved shapes through injection molding, thermoforming, and other processes. PMMA acrylic has a light transmittance of up to 92%, high surface hardness, good scratch resistance, and excellent chemical stability, making it less likely to react chemically with the metal components inside the piano. It is also relatively inexpensive, making it suitable for large-scale applications. Tempered glass, as a high-end choice, has a light transmittance of over 91%, the highest surface hardness, and the best chemical corrosion resistance, but it is heavy and requires a special installation and fixing solution.

[0029] Fourth embodiment; Reference Figure 1-2As shown, it also includes an optional display assembly. The display assembly removes the backlight of the traditional LCD display, retains the liquid crystal panel module, adopts the MIPI-DSI4 channel interface standard, and has dual working states of display mode and transparent mode. In display mode, the light transmittance is maintained at more than 60%, and in transparent mode, the overall light transmittance is ≥30%. The display is attached to the back surface of the transparent component.

[0030] In this embodiment, by removing the backlight of a traditional LCD display, the core components of the liquid crystal panel module are retained, including the liquid crystal panel, upper and lower polarizers, COG / TAB packaged row and column driver chips, FPC flexible circuit, T-Con timing control board, and support frame, forming a transparent display solution. The display adopts the MIPI-DSI 4-channel interface standard, conforms to the VESA MIPI-DSI v1.3 protocol specification, and is connected to the main control board via a 30cm long 4-channel shielded cable. The connector adopts the FFC 0.5mm pitch 30pin specification to ensure the stability and reliability of signal transmission. The key technological innovation of the display lies in its dual-mode operation: in display mode, image display is achieved by precisely controlling the deflection angle of liquid crystal molecules, at which time the light transmittance is maintained above 60%; in transparent mode, the liquid crystal molecules maintain a parallel alignment, and the overall light transmittance is ≥30%, consistent with the performance of the basic transparent components. The display is bonded to the back surface of the transparent soundboard cover 11, transparent keyboard cover 13, or transparent music stand 14, using optical adhesive for bubble-free bonding, with the bonding thickness controlled within 0.1mm to ensure that the overall optical effect is not affected. The modular design allows the display screen to be installed as an option or upgraded later according to user needs. When the display screen is missing, the transparent component can still fully perform the basic see-through function, providing users with flexible configuration options and cost control space.

[0031] Furthermore, the optional display system of this application includes two configuration states in actual use: In the first configuration state, the transparent soundboard cover 11, the transparent keyboard cover 13 and the transparent music stand 14 do not integrate the display screen. The light transmittance of their materials is ≥60%, and the operation of the internal mechanical structure of the piano can be directly observed after installation. In the second configuration state, a display screen is integrated behind at least one of the transparent soundboard cover 11, the transparent keyboard cover 13, and the transparent music stand 14, and the overall light transmittance of the transparent replacement component with the integrated display screen is ≥30%.

[0032] Furthermore, this invention provides two configuration states for the usage scenarios of the piano body 1: First state; High-transparency viewing mode: When the user's core need is to observe and display the exquisite internal mechanical structure of the piano, a non-integrated display screen with a high light transmittance of ≥60% is adopted, and preferably ≥85% transparent components can be used to provide an unobstructed view.

[0033] Second state: Intelligent interaction mode: When users need to integrate the display screen for sheet music display, teaching interaction, or multimedia playback, a configuration with an overall light transmittance of ≥30% is allowed. In this state, the light-transmitting components and the backlit display screen work together, primarily pursuing not extreme transparency, but a perfect integration of the displayed content and the semi-transparent background. The content is clear when displayed, and when not displaying anything, the screen appears as a uniformly bright panel, harmonizing with the overall lighting system of the piano.

[0034] Fifth embodiment; Reference Figure 1-2 As shown, it also includes a lighting system, which uses a programmable full-color LED light strip with the WS2812B protocol. It is installed inside the soundboard support beam of the piano and connected via a JSTSM 3pin connector. It supports PWM pulse width modulation stepless dimming, with a brightness adjustment range of 0-100% and color adjustment supporting 15.77 million colors of the full spectrum. It uses a sound sensor to collect audio signals to achieve synchronized changes between the lights and music.

[0035] In this embodiment, the LED strip uses a programmable full-color LED with the WS2812B protocol, powered and transmitting data via 18AWG silicone cable. The connector adopts the JSTSM 3-pin specification, ensuring reliable connection in the high-temperature environment inside the piano. The installation position of the LED strip is carefully designed, mainly distributed inside the soundboard support beam of the piano's internal resonance cavity. The L-shaped structure of the support beam forms a natural mounting groove, and a special adhesive is used for inlay fixation, ensuring a tight fit between the strip and the support beam without affecting the soundboard's vibration characteristics. Special light-guiding grooves, 2-3mm deep and 8-10mm wide, are designed below and behind the transparent components, where the LED strip is embedded, achieving uniform background lighting through diffuse reflection. Cable routing is carried out through the natural gaps next to the piano's internal action assembly, avoiding interference with moving mechanical parts. All cables are made of flame-retardant V-0 material with a temperature resistance of up to 150℃, ensuring long-term safe use in the piano's internal environment. The control system uses PWM pulse width modulation technology to achieve stepless dimming, with a brightness adjustment range of 0-100%. Color adjustment supports 15.77 million colors across the full spectrum. The system collects the audio signal of the piano performance in real time through a sound sensor, and extracts characteristic parameters such as pitch, volume, and tempo through FFT fast Fourier transform and spectrum analysis. This drives the LED lights to produce dynamic changes that are synchronized with the music, adding rich visual layers to the piano performance.

[0036] Sixth embodiment; Reference Figure 1-2As shown, it also includes a color-changing electronic film 3. The color-changing electronic film 3 adopts electrophoretic display technology, with a film thickness of 0.3-0.5mm. It adopts a segmented design and is attached to the piano soundboard shell. The size of each segment is controlled within 200mm×300mm. It is connected to the main control board through a standardized SPI interface, supports 15-bit color value data transmission, has a driving voltage range of 0-15V, and a response time of <200ms. It can achieve autonomous color-changing effects according to ambient light, touch signals, or music beats.

[0037] In this embodiment, the color-changing electronic film 3 employs electrophoretic display technology, achieving color changes through the electric field driving charged pigment particles within the microcapsules. The film thickness is controlled within the range of 0.3-0.5mm, exhibiting good flexibility, low power consumption, and stable display. The electronic film lamination adopts a segmented design, dividing the entire film into multiple regular or irregular geometric blocks according to the curved shape of the piano soundboard shell. Each block's size is controlled within 200mm × 300mm, ensuring no bubbles or wrinkles are generated during lamination. The lamination process uses a dedicated optical-grade pressure-sensitive adhesive with a 25-micron thick layer, exhibiting excellent initial and long-lasting adhesion while maintaining good optical transparency and weather resistance. The electronic film connects to the main control board via a standardized SPI interface. The interface includes a clock line SCKGPIO36, a data line MOSIGPIO35, a chip select line CSGPIO37, and a ground shielding layer. The cable uses 22AWG twisted-pair shielded wire, with an outer 0.1mm copper foil shielding layer to effectively suppress electromagnetic interference. The connector adopts the JSTSH 4-pin standard, ensuring excellent contact reliability and environmental adaptability. The electronic diaphragm is fixed and routed through internal gaps in the underside and rear soundboard brackets of the piano, avoiding any impact on the piano's appearance and acoustic performance. The control system supports 15-bit color value data transmission in RGB565 format, with a drive voltage range of 0-15V and a response time of <200ms. It can autonomously change colors and achieve gradient color adjustments based on ambient light, touch signals, or musical rhythm, providing endless possibilities for personalized expression of the piano's appearance.

[0038] Furthermore, the color-changing electronic film 3 of this application achieves color-changing control through its electronic film driving unit via the following steps: ① The main control chip sends 16-bit color value data via the SPI bus; format: RGB565; ② The driver parses the data and applies a 0-15V voltage to the electrode grid; ③ Adjust the pigment distribution within the microcapsules according to the voltage value; Furthermore, it connects to the main control chip via an SPI interface, wherein: 1. SCK clock signal: Output from GPIO36 pin of ESP32-S3; 2. Data writing: RGB color value data is transmitted via GPIO35 pin; 3. Chip select control: The GPIO37 pin emits a low-level activation signal.

[0039] Specific implementation process: Step 1: When the piano begins to play, the sound sensor collects audio signals in real time. The system performs spectral analysis on the audio signals using FFT (Fast Fourier Transform) to extract key musical characteristic parameters such as pitch, volume, and tempo. The LED lighting system automatically adjusts color and brightness according to these musical characteristic parameters: warm-toned red-orange lights are triggered in the bass range, and cool-toned blue-purple lights are triggered in the treble range. Volume changes are controlled by PWM (Pulse Width Modulation) technology to achieve stepless dimming from 0-100%. An optional display module can intelligently switch between display mode and transparent mode. In display mode, music-related information such as sheet music and note tracks are displayed through the MIPI-DSI4 channel interface, maintaining a light transmittance of over 60%. In transparent mode, the internal mechanical operation is purely displayed, and the light transmittance is restored to over 60%. The color-changing electronic film 3 system completes color changes within a 200ms response time based on music tempo and ambient light sensor data. The driving voltage range of 0-15V precisely controls the movement of charged pigment particles within the microcapsules in the electrophoretic display technology, achieving dynamic color expression of the piano shell. Step Two: The system enters intelligent adaptive mode, automatically adjusting the overall visual effect according to changes in ambient light. When ambient light is sufficient, the LED lighting system reduces brightness output, highlighting the natural transparency of the transparent components and allowing the internal mechanical structure to be clearly displayed under natural light. When light is insufficient, the system automatically increases LED brightness and optimizes color temperature, creating the best viewing environment through a 15.77 million color full-spectrum adjustment function. Touch signal response is achieved through pressure sensing of the color-changing electronic film 3. When the user lightly touches the piano shell, the corresponding electronic film segments produce a color ripple effect, enhancing the human-computer interaction experience. The UV protection system operates continuously, with a 15-25 micrometer thick UV protection layer ensuring UV transmittance <1% and an anti-yellowing rating ΔY <5, maintaining the optical performance of the transparent components over the long term. The system has a memory learning function, automatically adjusting the lighting mode, color scheme, and display content according to the user's usage habits and playing style, providing a personalized visual experience for each pianist. Simultaneously, the impact resistance of all transparent components withstands 50J of impact energy without cracking, and the surface hardness is ≥2H (pencil hardness) to ensure the system's stability and durability during long-term use.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A visual piano teaching aid, characterized in that: Including the piano body (1); The piano body (1) includes a transparent soundboard cover (11), a transparent soundboard (12), a transparent keyboard cover (13), and a transparent music stand (14); The transparent soundboard cover (11), transparent soundboard (12), transparent keyboard cover (13) and transparent music stand (14) are all made of transparent optical grade material and are used to replace the corresponding non-transparent parts of the piano, making the internal mechanical structure of the piano visible. The transparent soundboard cover (11) is 11mm thick, the transparent keyboard cover (13) is 30mm thick, and the shape, outline, installation interface, and fixing point position of all transparent parts are completely matched with the corresponding parts of the original piano. The piano body (1) has a sound cavity, and a triangular support (15) is installed inside the sound cavity. A projector (2) is installed on the upper end of the triangular support (15) and the projector (2) is tilted.

2. The visual piano teaching aid and its control system according to claim 1, characterized in that, The transmittance of the transparent component material was measured at a wavelength of 550 nm according to ASTM D1003 standard, with a transmittance ≥60%. The test environment conditions were a temperature of 23±2℃ and a relative humidity of 50±5%. An integrating sphere transmittance meter was used for precise measurement, with a measurement accuracy of ±0.1%.

3. The visual piano teaching aid according to claim 1, characterized in that, The transparent component is made of optical-grade polycarbonate (PMMA) acrylic or tempered glass, wherein the optical-grade polycarbonate has an impact strength of 60% 0J / m and a temperature range of -40℃ to +120℃.

4. The visual piano teaching aid according to claim 1, characterized in that, It also includes an optional display assembly, which removes the backlight of a traditional LCD display, retains the liquid crystal panel module, adopts the MIPI-DSI4 channel interface standard, and has dual working states of display mode and transparent mode. In display mode, the light transmittance is maintained at more than 60%, and in transparent mode, the overall light transmittance is ≥30%. The display is attached to the rear surface of the transparent component.

5. The visual piano teaching aid according to claim 1, characterized in that, It also includes a lighting system, which uses a programmable full-color LED light strip with the WS2812B protocol. The light strip is installed inside the soundboard support beam of the piano and connected via a JSTSM 3pin connector. It supports PWM pulse width modulation stepless dimming with a brightness adjustment range of 0-100% and color adjustment supporting 15.77 million colors of the full spectrum. It uses a sound sensor to collect audio signals to achieve synchronized changes between the lights and the music.

6. The visual piano teaching aid according to claim 1, characterized in that, It also includes a color-changing electronic film (3), which adopts electrophoretic display technology, with a film thickness of 0.3-0.5mm. It adopts a segmented design and is attached to the piano soundboard shell. The size of each segment is controlled within 200mm×300mm. It is connected to the main control board through a standardized SPI interface, supports 15-bit color value data transmission, has a driving voltage range of 0-15V, and a response time of <200ms. It can achieve autonomous color-changing effects according to ambient light, touch signals, or music beats.

7. A visual piano teaching aid control system, characterized in that, It includes a main control chip, and an electronic film driver, a transparent display screen, an LED light strip, a projector, a sound sensor, and an infrared sensor, all electrically connected to the main control chip.

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