Coffee-based store propaganda and sales management system and method

Abstract

The invention relates to the technical field of store propaganda and sales management, and particularly discloses a restaurant-based store propaganda and sales management system and method.A liquid crystal glass curtain wall with the controllable refractive index is installed on the outer vertical face of a coffee restaurant, and the refractive index of the curtain wall can be dynamically adjusted according to a preset instruction; meanwhile, the curtain wall is combined with real-time illumination information, so that the display brightness of the advertisement content corresponding to the curtain wall is dynamically adjusted; the method comprises the following steps of: identifying a focus area watched by each pedestrian in real time by utilizing a distributed monitoring instrument, analyzing a pupil focal length change rate of each pedestrian, and combining a moving speed of each pedestrian in unit time, thereby dynamically adjusting a playing mode of advertisement content corresponding to a curtain wall, dynamically adjusting the brightness and the playing mode of the advertisement content, and improving the advertisement playing effect. The ornamental value, the user experience and the interactivity of the advertisement are improved, the effect and the conversion rate of the advertisement are more effectively improved, and more market advantages are brought to commercial propaganda and brand promotion.

Description

Technical Field

[0001] The invention belongs to the technical field of store publicity and sales management, and relates to a store publicity and sales management system and method based on a coffee shop. Background Art

[0002] In the operation of a coffee shop, the importance of store publicity and sales management is self-evident. Publicity is an important means of conveying brand image and product features to consumers, which can attract customers' attention, increase brand exposure, and enhance brand awareness and reputation. Through clever publicity strategies, coffee shops can attract more potential customers, increase customer flow, and promote sales growth. Sales management is to ensure the achievement of sales targets, improve sales efficiency and customer satisfaction through effective management of the sales process, and promote sustained growth in performance. Reasonable sales management can enhance customer loyalty, increase repurchase rate, and achieve long-term and stable operation.

[0003] However, current coffee shop promotions are mainly displayed in static form, which has some technical defects and disadvantages. First, static promotion forms lack sufficient appeal and interactivity, and it is difficult to arouse the interest and attention of customers. In the era of information explosion, consumers are more picky and demanding in their acceptance and response to advertising content, and static promotion forms often fail to resonate with them. Secondly, static promotions cannot be dynamically adjusted according to the real-time environment and customer needs, lack personalization and targeting, and are difficult to effectively attract target customer groups and enhance brand value. In addition, the update and maintenance costs of static promotion forms are high, and promotional content and materials need to be changed frequently, which increases operating costs and management burdens.

[0004] In view of these technical defects and drawbacks, the limitations of current technology are mainly reflected in the innovation of promotional forms and personalized display. Existing technologies fail to fully utilize digital and intelligent technologies and cannot achieve dynamic and personalized promotional content display. The lack of support for real-time data analysis and intelligent recommendation systems makes it impossible to adjust promotional content according to customers' real-time needs and environmental changes, affecting the promotion effect and sales performance. In addition, static promotional forms also limit interaction and communication with customers, making it impossible to achieve precision marketing and customer relationship management, affecting the sustainable development of the brand and the improvement of competitiveness. Summary of the invention

[0005] In view of the above problems existing in the prior art, the present invention provides a store promotion and sales management system and method based on a coffee shop, which are used to solve the above technical problems.

[0006] In order to achieve the above purpose and other purposes, the technical solution adopted by the present invention is as follows: On one hand, the present invention provides a store promotion and sales management method based on a coffee shop, the method comprising the following steps: Install a controllable refractive index liquid crystal glass curtain wall on the facade of the cafe, which can dynamically adjust its refractive index according to preset instructions, and combine the curtain wall with real-time lighting information to dynamically adjust the display brightness of the curtain wall corresponding to the advertising content; By using the deployed monitoring instruments, the focus area of ​​each pedestrian's attention can be identified in real time. By analyzing the change rate of each pedestrian's pupil focal length and combining the movement rate of each pedestrian in a unit time, the playback mode of the corresponding advertising content on the curtain wall can be dynamically adjusted.

[0007] Another aspect of the present invention provides a store promotion and sales management system based on a cafe, comprising: a display brightness adjustment module and a playback mode determination module, wherein the above modules are connected by wired and / or wireless connection to achieve data transmission between the modules; Display brightness adjustment module: Install a controllable refractive index liquid crystal glass curtain wall on the facade of the cafe. The curtain wall can dynamically adjust its refractive index according to preset instructions. At the same time, the curtain wall is combined with real-time lighting information to dynamically adjust the display brightness of the curtain wall corresponding to the advertising content; Playback mode determination module: Utilize the deployed monitoring instruments to identify the focus area of ​​each pedestrian in real time, analyze the change rate of each pedestrian's pupil focal length, and combine the movement rate of each pedestrian in unit time to dynamically adjust the playback mode of the curtain wall corresponding to the advertising content.

[0008] Compared with the prior art, the present invention has the following beneficial effects: The embodiment of the present invention installs a controllable refractive index liquid crystal glass curtain wall on the facade of a cafe, combines real-time lighting information and pedestrian visual behavior data to dynamically adjust the brightness and playback mode of advertising content. By adjusting the refractive index of the curtain wall in real time and dynamically adjusting the brightness of the advertising content according to preset instructions, the system can automatically adjust the display effect according to external lighting conditions to ensure that the advertising content is always clearly visible, thereby improving the viewing and attractiveness of the advertisement. This intelligent adjustment not only improves the user experience, but also increases the exposure and effect of the advertising content; Secondly, monitoring instruments are used to identify pedestrians’ gaze focus areas and pupil focal length change rates in real time, and combined with the movement rate, the playback mode of the corresponding advertising content on the curtain wall is dynamically adjusted, making the advertising content more targeted and interactive. Through personalized advertising presentation, the interactivity between advertising and audiences is increased, and the effective communication of advertising and user participation are improved; In addition, the implementation of this system enables advertising content to more intelligently adapt to the gaze behavior and movement speed of different groups of people, thereby improving the pertinence and attractiveness of advertising, and effectively improving the conversion rate and effect of advertising. By combining lighting information and pedestrian visual behavior data, dynamic adjustment of advertising content is achieved, making advertising more personalized and interactive, further improving the influence and market competitiveness of advertising; In summary, by integrating controllable refractive index liquid crystal glass curtain walls, real-time lighting information, and pedestrian visual behavior data, the brightness and playback mode of advertising content can be dynamically adjusted, which not only improves the viewing experience, user experience, and interactivity of the advertisements, but also more effectively improves the effectiveness and conversion rate of the advertisements, bringing more technical and market advantages to commercial publicity and brand promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0010] Figure 1 It is a schematic diagram of the connection of each step of the method of the present invention.

[0011] Figure 2 It is a schematic diagram of the connection of various modules of the system of the present invention. DETAILED DESCRIPTION

[0012] The above contents in combination with the implementation of the present invention are merely examples and explanations of the concept of the present invention. The technical personnel in the relevant technical field may make various modifications or supplements to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

[0013] Example 1 See also Figure 1 As shown, a store promotion and sales management method based on a coffee shop comprises the following steps: Install a controllable refractive index liquid crystal glass curtain wall on the facade of the cafe, which can dynamically adjust its refractive index according to preset instructions, and combine the curtain wall with real-time lighting information to dynamically adjust the display brightness of the curtain wall corresponding to the advertising content; The display brightness of the corresponding advertising content of the curtain wall is dynamically adjusted by calculating the actual refractive index of each liquid crystal pixel in the curtain wall, thereby obtaining the actual driving voltage of each liquid crystal pixel in the curtain wall, and sending the actual driving voltage of each liquid crystal pixel to the curtain wall control terminal, which finally controls the operation by the curtain wall control terminal to adjust the display brightness of the advertising content.

[0014] Calculate the actual refractive index of each liquid crystal pixel in the curtain wall. The specific calculation process is as follows: Extract the real-time solar irradiance Fz, incident zenith angle θ1, incident azimuth angle θ2, incident light wavelength λ and curtain wall surface temperature T from the real-time lighting information; A right-handed Cartesian coordinate system is established based on the plane where the curtain wall is located to determine the two-dimensional coordinates of each LCD pixel in the curtain wall. , c is the number of each liquid crystal pixel; thus, the calculation formula , respectively calculate the components of the wave vector corresponding to each liquid crystal pixel on the X-axis and Y-axis ; Based on the solar irradiance Fz and the curtain wall temperature T, the target brightness field of each LCD pixel is comprehensively calculated. , is the mean value of the gray value matrix of all frame images corresponding to the advertisement content after time domain smoothing, is the optical efficiency of the curtain wall, e is a natural constant, T0 is the set reference temperature, usually set to 25 degrees Celsius, α is the predefined temperature attenuation coefficient; τ is the Gamma correction coefficient, which is set to 2.2 and is used to adjust the brightness perception; based on , calculate the propagation constant of light waves in the thickness direction of the liquid crystal layer , n is the basic refractive index of the glass curtain wall when no voltage is applied; And generate the Jacobian matrix , j is the jth pixel point affected by the light intensity of the cth liquid crystal pixel point, which is simply referred to as each affected pixel point, CD and GD represent the length and width of each liquid crystal pixel point respectively, △z is the thickness of the liquid crystal layer, is the complex amplitude of the incident light field affecting the jth pixel, , It is characterized by the sensitivity of the jth influencing pixel to the output light intensity of the cth liquid crystal pixel, and sinc is the Sinker function; ε is the dielectric constant of vacuum, Gs is the speed of light, is the area of ​​a single LCD pixel on the curtain wall, i represents an imaginary unit, are the horizontal and vertical coordinates of the cth liquid crystal pixel in the curtain wall respectively; By establishing the Jacobian matrix and discretizing the Helmholtz equation, and using the ADMM algorithm to solve the least squares problem of the Helmholtz equation, the refractive index correction matrix of the liquid crystal pixel points is obtained; at the same time, based on the refractive index correction matrix of the liquid crystal pixel points, the refractive index correction value of each liquid crystal pixel point is extracted from it; The curtain wall plane is divided into N×M liquid crystal pixels (such as 5mm×5mm), and the finite difference method is used to spatially discretize the Helmholtz equation to generate a set of linear equations describing the propagation of the light field. The mathematical relationship between the complex amplitude of the light field and the refractive index distribution is established, and the difference between the target advertising brightness and the current light intensity is used as the optimization target. The L1 regularization term (suppressing the refractive index mutation) is superimposed to construct a constrained least squares optimization problem. The goal is to minimize the brightness error while meeting the hardware physical limitations; the alternating direction multiplier method (ADMM) is used to decompose the optimization problem into three sub-problems: refractive index correction update, auxiliary variable update, and Lagrange multiplier update. Efficient solution is achieved through alternating iteration, and finally a globally optimized refractive index correction matrix is ​​output. The refractive index correction of each liquid crystal pixel is extracted from the correction matrix according to the liquid crystal pixel position index.

[0015] The first estimated refractive index of each liquid crystal pixel is obtained by adding the basic refractive index of the glass curtain wall when no voltage is applied to the refractive index correction value of each liquid crystal pixel. ; Using analytical formula , and obtain the second estimated refractive index of each liquid crystal pixel ; Get the upper limit of the refractive index of the liquid crystal material corresponding to the glass curtain wall And the lower limit value , and finally determine the actual refractive index of each liquid crystal pixel .

[0016] Through the three steps of substrate refractive index superposition, temperature compensation and physical constraint verification, it can be ensured that the actual refractive index of the liquid crystal pixel can accurately reflect the required light field regulation effect, adapt to ambient temperature changes, and always remain within the physical limit of the liquid crystal material, thereby preventing display distortion or equipment damage caused by excessively high or low refractive index. This method not only improves the stability and reliability of the display effect, but also ensures the safety and controllability of the system under various operating conditions.

[0017] The logic for obtaining the actual driving voltage of each LCD pixel in the curtain wall is: Collect the real-time ambient temperature T1, and based on the electro-optical response characteristics of the liquid crystal, infer the driving voltage value of each liquid crystal pixel from the actual refractive index of each liquid crystal pixel ; In the above formula is the liquid crystal threshold voltage, defined as the critical voltage at which the refractive index begins to change; are the refractive indices of the liquid crystal molecules when aligned vertically and parallelly, respectively; is the refractive index drift caused by temperature, ; The driving voltage of each liquid crystal pixel is superimposed on the temperature compensation term to obtain the driving compensation voltage value of each liquid crystal pixel. , is the predefined voltage temperature coefficient, which describes the sensitivity of voltage to temperature changes. The typical value is ; The driving compensation voltage value of each liquid crystal pixel is smoothed to finally obtain the actual driving voltage of each liquid crystal pixel. : , They represent the minimum safe driving voltage and the maximum withstand voltage respectively.

[0018] At the same time, a 3D binocular customer flow counter is deployed at the entrance of the coffee shop to count the number of people outside the coffee shop per unit time in real time, and deeply and dynamically adjust the display brightness of the curtain wall corresponding to the advertising content; By using the deployed monitoring instruments, the focus area of ​​each pedestrian's attention can be identified in real time. By analyzing the change rate of each pedestrian's pupil focal length and combining the movement rate of each pedestrian in a unit time, the playback mode of the corresponding advertising content on the curtain wall can be dynamically adjusted.

[0019] Analyze the pupil focal length change rate of each pedestrian. The analysis process is as follows: Obtain the physiological Ives-Stark relationship between pupil diameter and focal length , is the pupil diameter at the reference focal length f0, is the pupil adjustment sensitivity coefficient, f0 is the reference focal length, and f represents the unknown focal length. It is represented as the pupil diameter corresponding to the unknown focal length; and the derivative is taken to obtain the pupil diameter change rate The change rate of pupil focal length Relationship: ; It should be added that the pupil diameter change rate is obtained The specific derivation process is: Based on the physiological Ives-Stark relationship between pupil diameter and focal length , and pair it with Derivative: ; In conversion via the chain rule: ; Calculate the pupil diameter change rate using the central difference method , where △t is the sampling interval of the monitoring instrument, is the pupil diameter at t measurement time points, The pupil diameters are t measurement time points plus the sampling interval and t measurement time points minus the sampling interval, respectively; The pupil focal length change rate is obtained from this , the pupil focal length change rate of each pedestrian is calculated in the same way according to the calculation method of the pupil focal length change rate.

[0020] The playback modes of the curtain wall corresponding advertising content are divided into three-level summary playback mode, two-level standard playback mode and one-level enhanced playback mode.

[0021] Focus the gaze focus area of ​​each pedestrian, record the pedestrians whose gaze focus area is focused on the LCD glass curtain wall of the cafe as target pedestrians, and obtain the total number of target pedestrians H; If H=0, the playback mode of the curtain wall corresponding to the advertising content uses the three-level summary playback mode. The playback logic of the three-level summary playback mode is to compress the playback time of the advertising content, and at the same time, the key information is enhanced by stroboscopic. If H 1, then the movement speed of each pedestrian in the unit time is obtained. If there is at least one pedestrian whose movement speed in the unit time is less than the preset movement speed threshold, the playback mode of the advertising content corresponding to the curtain wall starts the first-level enhanced playback mode. The playback logic of the first-level enhanced playback mode is to use spatial projection technology to dynamically display the three-dimensional model of the coffee shop products; if the movement speed of each pedestrian in the unit time is greater than the preset movement speed threshold, then the playback mode of the advertising content corresponding to the curtain wall starts the second-level standard playback mode. The playback logic of the second-level standard playback mode is to dynamically adjust the playback frame rate of the advertising content corresponding to the curtain wall based on the average pupil focal length change rate of all pedestrians.

[0022] If the playback mode of the advertising content corresponding to the curtain wall enables the three-level summary playback mode, the playback time of the compressed advertising content corresponding to the curtain wall is dynamically adjusted based on the original playback time Sc of the advertising content corresponding to the curtain wall. , tanh(·) represents the hyperbolic tangent function, is the mean pupil focal length change rate of all pedestrians; In this mode, when the total number of target pedestrians H = 0, the playing time of the advertisement content is compressed. By using the hyperbolic tangent function (tanh), we can effectively limit the compression ratio to the range of 0.3 to 0.4. The benefit of this design is that it ensures that even in fast-moving situations, the advertisement can still convey key information without being too lengthy, which may cause the audience to lose interest. Synchronous calculation of the flash frequency of key information in the three-level summary playback mode , v is the average moving speed of all pedestrians per unit time; the strobe frequency of the advertising content is used to attract the attention of pedestrians. The strobe frequency will be adjusted according to the change rate of the pupil focal length and the moving speed of the pedestrians to enhance the effectiveness of information transmission; In this formula, the strobe frequency is set between 8 and 10 Hz. The use of the Sigmoid function ensures a smooth transition of the strobe frequency, avoiding discomfort caused by abrupt changes to the audience. By combining the pupil focus change rate with the speed, we can dynamically adjust the strobe frequency to adapt to the changes in the audience's attention, ensuring that it does not cause visual fatigue within this range; If the playback mode of the curtain wall corresponding to the advertising content enables the secondary standard playback mode, calculate the playback frame rate of the curtain wall corresponding to the advertising content The frame rate of the advertising content is adjusted according to the speed of pedestrians and the changes in pupil adjustment. The increase in frame rate can make the picture smoother, thus improving the user's viewing experience. In this speed range, the frame rate of the advertisement is dynamically adjusted according to the change rate of pupil focal length. When the focal length change rate exceeds 0.2 m / s, the frame rate can be increased to 36 fps, thereby enhancing the smoothness of the picture. The increase in frame rate can make the advertising content more attractive, especially when pedestrians slow down, so as to better capture their attention. The number 30 fps is the standard frame rate for video playback, and the increase to 36 fps is based on the demand for the smoothness of dynamic content, ensuring that viewers have a better viewing experience; If the playback mode of the curtain wall corresponding to the advertising content is enabled in the first-level enhanced playback mode, then the scaling ratio of the 3D model of the product displayed in the coffee shop is calculated. ; In augmented reality (AR) mode, the size of the 3D model will be adjusted according to the pupil focal length change rate to ensure the proper display and interaction of the model in the user's field of view, with a maximum zoom ratio of 1.5 times; When the pedestrian speed is lower than the preset movement rate threshold, the 3D model of the advertising content is scaled according to the focal length change rate. This mode is designed to enhance the immersion of the AR experience, making the model more vivid when the viewer is looking at it. The number 0.5 was selected based on physiological research on focal length adjustment, which shows that within a certain range, the change in pupil focal length is positively correlated with the change in model size. The maximum zoom ratio is 1.5 times, which ensures that the AR content can still effectively attract the audience's attention when observing at close range.

[0023] Example 2 like Figure 2As shown, a store promotion and sales management system based on a coffee shop includes: a display brightness adjustment module and a playback mode determination module, wherein the above modules are connected by wired and / or wireless connection to realize data transmission between the modules; Display brightness adjustment module: Install a controllable refractive index liquid crystal glass curtain wall on the facade of the cafe. The curtain wall can dynamically adjust its refractive index according to preset instructions. At the same time, the curtain wall is combined with real-time lighting information to dynamically adjust the display brightness of the curtain wall corresponding to the advertising content; Playback mode determination module: Utilize the deployed monitoring instruments to identify the focus area of ​​each pedestrian in real time, analyze the change rate of each pedestrian's pupil focal length, and combine the movement rate of each pedestrian in unit time to dynamically adjust the playback mode of the curtain wall corresponding to the advertising content.

[0024] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0025] It should be understood that determining B based on A does not mean determining B only based on A. B can also be determined based on A and / or other information.

[0026] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0027] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A store promotion and sales management method based on a coffee shop, characterized in that: include: Install a controllable refractive index liquid crystal glass curtain wall on the facade of the cafe, which can dynamically adjust its refractive index according to preset instructions, and combine the curtain wall with real-time lighting information to dynamically adjust the display brightness of the curtain wall corresponding to the advertising content; By using the deployed monitoring instruments, the focus area of ​​each pedestrian's attention can be identified in real time. By analyzing the change rate of each pedestrian's pupil focal length and combining the movement rate of each pedestrian in a unit time, the playback mode of the corresponding advertising content on the curtain wall can be dynamically adjusted.

2. A coffee shop store promotion and sales management method according to claim 1, characterized in that: The display brightness of the corresponding advertising content of the curtain wall is dynamically adjusted by calculating the actual refractive index of each liquid crystal pixel in the curtain wall, thereby obtaining the actual driving voltage of each liquid crystal pixel in the curtain wall, and sending the actual driving voltage of each liquid crystal pixel to the curtain wall control terminal, which finally controls the operation by the curtain wall control terminal to adjust the display brightness of the advertising content.

3. A coffee shop store promotion and sales management method according to claim 2, characterized in that: Calculate the actual refractive index of each liquid crystal pixel in the curtain wall. The specific calculation process is as follows: Extract the real-time solar irradiance Fz, incident zenith angle θ1, incident azimuth angle θ2, incident light wavelength λ and curtain wall surface temperature T from the real-time lighting information; A right-handed Cartesian coordinate system is established based on the plane where the curtain wall is located to determine the two-dimensional coordinates of each LCD pixel in the curtain wall. , c is the number of each liquid crystal pixel; Therefore, by calculating the formula , respectively calculate the components of the wave vector corresponding to each liquid crystal pixel on the X-axis and Y-axis ; Based on the solar irradiance Fz and the curtain wall temperature T, the target brightness field of each LCD pixel is comprehensively calculated. , is the mean value of the gray value matrix of all frame images corresponding to the advertisement content after time domain smoothing, is the optical efficiency of the curtain wall, e is a natural constant, T0 is the set reference temperature, α is the predefined temperature attenuation coefficient; τ is the Gamma correction coefficient, which is 2.2 and is used to adjust the brightness perception; based on , calculate the propagation constant of light waves in the thickness direction of the liquid crystal layer , n is the basic refractive index of the glass curtain wall when no voltage is applied; And generate the Jacobian matrix , j is the jth pixel point affected by the light intensity of the cth liquid crystal pixel point, which is simply referred to as each affected pixel point, CD and GD represent the length and width of each liquid crystal pixel point respectively, △z is the thickness of the liquid crystal layer, is the complex amplitude of the incident light field affecting the jth pixel, It is characterized by the sensitivity of the jth influencing pixel to the output light intensity of the cth liquid crystal pixel, and sinc is the Sinker function; By establishing the Jacobian matrix and discretizing the Helmholtz equation, and using the ADMM algorithm to solve the least squares problem of the Helmholtz equation, the refractive index correction matrix of the liquid crystal pixel points is obtained; at the same time, based on the refractive index correction matrix of the liquid crystal pixel points, the refractive index correction value of each liquid crystal pixel point is extracted from it; The first estimated refractive index of each liquid crystal pixel is obtained by adding the basic refractive index of the glass curtain wall when no voltage is applied to the refractive index correction value of each liquid crystal pixel. ; Using analytical formula , and obtain the second estimated refractive index of each liquid crystal pixel ; Get the upper limit of the refractive index of the liquid crystal material corresponding to the glass curtain wall And the lower limit value , and finally determine the actual refractive index of each liquid crystal pixel .

4. A coffee shop store promotion and sales management method according to claim 3, characterized in that: The logic for obtaining the actual driving voltage of each LCD pixel in the curtain wall is: Collect the real-time ambient temperature T1, and based on the electro-optical response characteristics of the liquid crystal, infer the driving voltage value of each liquid crystal pixel from the actual refractive index of each liquid crystal pixel ; In the above formula is the liquid crystal threshold voltage, defined as the critical voltage at which the refractive index begins to change; are the refractive indices of the liquid crystal molecules when aligned vertically and parallelly, respectively; is the refractive index drift caused by temperature, ; The driving voltage of each liquid crystal pixel is superimposed on the temperature compensation term to obtain the driving compensation voltage value of each liquid crystal pixel. , is a predefined voltage temperature coefficient, describing the sensitivity of voltage to temperature changes; The driving compensation voltage value of each liquid crystal pixel is smoothed to finally obtain the actual driving voltage of each liquid crystal pixel. : , They represent the minimum safe driving voltage and the maximum withstand voltage respectively.

5. The method for store promotion and sales management based on a coffee shop according to claim 1, characterized in that: Analyze the pupil focal length change rate of each pedestrian. The analysis process is as follows: Obtain the physiological Ives-Stark relationship between pupil diameter and focal length , is the pupil diameter at the reference focal length f0, is the pupil adjustment sensitivity coefficient, f0 is the reference focal length, and f represents the unknown focal length. It is represented as the pupil diameter corresponding to the unknown focal length; and the derivative is taken to obtain the pupil diameter change rate The change rate of pupil focal length Relationship: ； Calculate the pupil diameter change rate using the central difference method , where △t is the sampling interval of the monitoring instrument, is the pupil diameter at t measurement time points, The pupil diameters are t measurement time points plus the sampling interval and t measurement time points minus the sampling interval, respectively; The pupil focal length change rate is obtained from this , the pupil focal length change rate of each pedestrian is calculated in the same way according to the calculation method of the pupil focal length change rate.

6. A coffee shop store promotion and sales management method according to claim 1, characterized in that: The playback modes of the curtain wall corresponding advertising content are divided into three-level summary playback mode, two-level standard playback mode and one-level enhanced playback mode.

7. A coffee shop store promotion and sales management method according to claim 6, characterized in that: Focus the gaze focus area of ​​each pedestrian, record the pedestrians whose gaze focus area is focused on the LCD glass curtain wall of the cafe as target pedestrians, and obtain the total number of target pedestrians H; If H=0, the playback mode of the curtain wall corresponding to the advertising content uses the three-level summary playback mode. The playback logic of the three-level summary playback mode is to compress the playback time of the advertising content, and at the same time, the key information is enhanced by stroboscopic. If H 1, then the movement speed of each pedestrian in the unit time is obtained. If there is at least one pedestrian whose movement speed in the unit time is less than the preset movement speed threshold, the playback mode of the advertising content corresponding to the curtain wall starts the first-level enhanced playback mode. The playback logic of the first-level enhanced playback mode is to use spatial projection technology to dynamically display the three-dimensional model of the coffee shop products; if the movement speed of each pedestrian in the unit time is greater than the preset movement speed threshold, then the playback mode of the advertising content corresponding to the curtain wall starts the second-level standard playback mode. The playback logic of the second-level standard playback mode is to dynamically adjust the playback frame rate of the advertising content corresponding to the curtain wall based on the average pupil focal length change rate of all pedestrians.

8. The coffee shop store promotion and sales management method according to claim 7, characterized in that: If the playback mode of the advertising content corresponding to the curtain wall enables the three-level summary playback mode, the playback time of the compressed advertising content corresponding to the curtain wall is dynamically adjusted based on the original playback time Sc of the advertising content corresponding to the curtain wall. , tanh(·) represents the hyperbolic tangent function, is the mean pupil focal length change rate of all pedestrians; Synchronous calculation of the flash frequency of key information in the three-level summary playback mode , v is the average moving speed of all pedestrians in unit time; If the playback mode of the curtain wall corresponding to the advertising content enables the secondary standard playback mode, calculate the playback frame rate of the curtain wall corresponding to the advertising content ; If the playback mode of the curtain wall corresponding to the advertising content is enabled in the first-level enhanced playback mode, then the scaling ratio of the 3D model of the product displayed in the coffee shop is calculated. .

9. A store promotion and sales management system based on a coffee shop, characterized in that: The method is implemented based on a cafe-based store promotion and sales management method according to any one of claims 1 to 8, and includes: a display brightness adjustment module and a playback mode determination module, wherein the above modules are connected by wired and / or wireless connection to realize data transmission between the modules; Display brightness adjustment module: Install a controllable refractive index liquid crystal glass curtain wall on the facade of the cafe. The curtain wall can dynamically adjust its refractive index according to preset instructions. At the same time, the curtain wall is combined with real-time lighting information to dynamically adjust the display brightness of the curtain wall corresponding to the advertising content; Playback mode determination module: Utilize the deployed monitoring instruments to identify the focus area of ​​each pedestrian in real time, analyze the change rate of each pedestrian's pupil focal length, and combine the movement rate of each pedestrian in unit time to dynamically adjust the playback mode of the curtain wall corresponding to the advertising content.

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