A cafe-based door store promotion and sale management system and method

Abstract

The application relates to the technical field of store propaganda and sales management, and particularly discloses a store propaganda and sales management system and method based on a coffee shop, wherein controllable refractive index liquid crystal glass curtain walls are installed on the outer facades of the coffee shop; the curtain walls can dynamically adjust the refractive indexes according to preset instructions, and the curtain walls are combined with real-time illumination information, so that the display brightness of the corresponding advertisement content of the curtain walls is dynamically adjusted; the monitoring instruments are used to identify the gaze focus areas of each pedestrian in real time, the change rates of the pupil focal lengths of each pedestrian are analyzed, and the moving speeds of each pedestrian in a unit time are combined, so that the playing modes of the corresponding advertisement content of the curtain walls are dynamically adjusted, the brightness and the playing mode of the advertisement content are dynamically adjusted, the observability, the user experience and the interactivity of the advertisement are improved, the effect and the conversion rate of the advertisement are effectively improved, and more market advantages are brought to commercial propaganda and brand promotion.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of store promotion and sales management, and relates to a store promotion and sales management system and method based on a coffee shop. BACKGROUND

[0002] In the operation of a coffee shop, the importance of store promotion and sales management is self-evident. Promotion is an important means of conveying brand image and product characteristics to consumers, which can attract the attention of customers, increase brand exposure, and improve brand recognition and reputation. Through clever promotion strategies, a coffee shop can attract more potential customers, increase customer flow, and promote sales growth. Sales management ensures the realization of sales targets, improves sales efficiency and customer satisfaction, and promotes sustained growth in performance through effective management of the sales process. Reasonable sales management can improve customer loyalty, increase repeat purchase rates, and achieve long-term stable operation.

[0003] However, current coffee shop promotion is mainly in the form of static display, which has some technical defects and drawbacks. First, static promotion lacks sufficient appeal and interactivity, making it difficult to capture the interest and attention of customers. In an era of information explosion, consumers are more demanding and critical of advertising content, and static promotion often fails to resonate with them. Second, static promotion cannot be dynamically adjusted according to real-time environmental and customer needs, lacks personalization and targeting, and is difficult to effectively attract target customer groups and enhance brand value. In addition, the cost of updating and maintaining static promotion is high, requiring frequent changes in promotional content and materials, increasing operating costs and management burdens.

[0004] In view of these technical defects and drawbacks, the current technology is limited in terms of innovation and personalized display of promotional forms. Existing technology fails to fully utilize digital and intelligent technology, making it impossible to achieve dynamic and personalized display of promotional content. Without the support of real-time data analysis and intelligent recommendation systems, promotional content cannot be adjusted according to real-time customer needs and environmental changes, affecting the promotion effect and sales performance. In addition, static promotion also limits interaction and communication with customers, making it impossible to achieve precision marketing and customer relationship management, affecting the sustained development of the brand and the improvement of competitiveness. SUMMARY

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

[0006] To achieve the above and other objects, the technical solutions adopted by the present application are as follows:

[0007] The application provides a coffee shop-based store promotion and sales management method, which comprises the following steps.

[0008] The controllable refractive index liquid crystal glass curtain wall is installed on the outer facade of the coffee shop, and the curtain wall can dynamically adjust its refractive index according to preset instructions, and the curtain wall is combined with real-time illumination information, so that the display brightness of the corresponding advertisement content of the curtain wall is dynamically adjusted.

[0009] The monitoring instrument is used to identify the gaze focal point area of each pedestrian in real time, the change rate of the pupil focal length of each pedestrian is analyzed, and the moving speed of each pedestrian in a unit of time is combined, so that the playing mode of the corresponding advertisement content of the curtain wall is dynamically adjusted.

[0010] The application also provides a coffee shop-based store promotion and sales management system, which comprises a display brightness adjusting module and a playing mode determining module.

[0011] The display brightness adjusting module comprises the controllable refractive index liquid crystal glass curtain wall installed on the outer facade of the coffee shop, and the curtain wall can dynamically adjust its refractive index according to preset instructions, and the curtain wall is combined with real-time illumination information, so that the display brightness of the corresponding advertisement content of the curtain wall is dynamically adjusted.

[0012] The playing mode determining module comprises the monitoring instrument, which is used to identify the gaze focal point area of each pedestrian in real time, analyze the change rate of the pupil focal length of each pedestrian, and combine the moving speed of each pedestrian in a unit of time, so that the playing mode of the corresponding advertisement content of the curtain wall is dynamically adjusted.

[0013] Compared with the prior art, the application has the following advantages:

[0014] The controllable refractive index liquid crystal glass curtain wall is installed on the outer facade of the coffee shop, real-time illumination information and visual behavior data of pedestrians are combined, the brightness and playing mode of the advertisement content are dynamically adjusted, the refractive index of the curtain wall is adjusted in real time, the brightness of the advertisement content is dynamically adjusted according to preset instructions, the system can automatically adjust the display effect according to external illumination conditions, the advertisement content is always clear and visible, and the ornamental value and attractiveness of the advertisement are improved. The intelligent adjustment not only improves the user experience, but also increases the exposure and effect of the advertisement content.

[0015] Secondly, the monitoring instrument is used to identify the gaze focal point area and the change rate of the pupil focal length of the pedestrian in real time, the moving speed is combined, the playing mode of the corresponding advertisement content of the curtain wall is dynamically adjusted, the advertisement content is more targeted and interactive, personalized advertisement presentation is realized, the interactivity between the advertisement and the audience is increased, and the effective communication of the advertisement and the user participation are improved.

[0016] In addition, the implementation of the system enables the advertising content to be more intelligently adapted to the gaze behavior and movement rate of different crowds, thereby improving the targeting and appeal of the advertising and effectively improving the conversion rate and effect of the advertising. By combining the illumination information and the visual behavior data of the pedestrians, dynamic adjustment of the advertising content is realized, making the advertising more personalized and interactive, and further improving the influence and market competitiveness of the advertising;

[0017] In summary, by integrating the controllable refractive index liquid crystal glass curtain wall, real-time illumination information, and pedestrian visual behavior data, the brightness and playing mode of the advertising content are dynamically adjusted, which not only improves the observability, user experience, and interactivity of the advertising, but also effectively improves the effect and conversion rate of the advertising, bringing more technical advantages and market advantages for business promotion and brand promotion. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 The schematic diagram for connecting each step of the method of the present application.

[0020] Figure 2 The schematic diagram for connecting each module of the system of the present application. DETAILED DESCRIPTION

[0021] The above content of the present application will be described below in combination with the present application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or adopt similar ways to replace them, as long as they do not deviate from the concept of the present application or exceed the scope defined by the present claims, and all of them shall fall within the protection scope of the present application.

[0022] Embodiment 1

[0023] Please refer to Figure 1 As shown in the figure, a coffee shop-based store promotion and sales management method, the method comprising the following steps:

[0024] A controllable refractive index liquid crystal glass curtain wall is installed on the facade of the coffee shop, the curtain wall can dynamically adjust its refractive index according to the preset instructions, and at the same time, the curtain wall is combined with real-time illumination information, thereby dynamically adjusting the display brightness of the corresponding advertising content of the curtain wall;

[0025] The display brightness of the curtain wall corresponding to the advertisement content is dynamically adjusted by calculating the actual refractive index of each liquid crystal pixel point in the curtain wall, then obtaining the actual driving voltage of each liquid crystal pixel point in the curtain wall, and sending the actual driving voltage of each liquid crystal pixel point to the curtain wall control terminal, and finally controlling the operation of the curtain wall control terminal to realize the adjustment of the display brightness of the advertisement content.

[0026] The actual refractive index of each liquid crystal pixel point in the curtain wall is calculated, and the specific calculation process is as follows:

[0027] The real-time solar irradiance Fz, incident zenith angle θ1, incident azimuth angle θ2, incident light wavelength λ and curtain wall surface temperature T are extracted from the real-time illumination information;

[0028] A right-handed Cartesian coordinate system is established with the plane of the curtain wall as the reference to determine the two-dimensional coordinates of each liquid crystal pixel point in the curtain wall , c is the number of each liquid crystal pixel point; thus, the components of the wave vector corresponding to each liquid crystal pixel point in the X and Y axes are calculated respectively by the calculation formula ;

[0029] Based on the solar irradiance Fz and the curtain wall temperature T, the target brightness field of each liquid crystal pixel point is comprehensively calculated , is the average value of the gray value matrix of the advertisement content corresponding to all frame images after time domain smoothing processing, is the optical efficiency of the curtain wall, e is the natural constant, T0 is the set reference temperature, which is usually set to 25 degrees Celsius, and a is the predefined temperature attenuation coefficient; τ is the Gamma correction coefficient, which is 2.2, used to adjust the brightness perception;

[0030] Based on , the propagation constant of the light wave in the thickness direction of the liquid crystal layer is calculated , n is the basic refractive index of the glass curtain wall without applying voltage;

[0031] and the Jacobian matrix is generated , j is the jth pixel point affected by the light intensity of the cth liquid crystal pixel point, which is simply denoted as each affected pixel point, CD and GD represent the length and width of each liquid crystal pixel point respectively, and △z is the thickness of the liquid crystal layer, is the incident light field complex amplitude of the jth affected pixel point, , is the sensitivity of the jth affected pixel point to the output light intensity of the cth liquid crystal pixel point, and sinc is the sinc function;

[0032] ε is the vacuum permittivity, Gs is the speed of light, is the area of a single liquid crystal pixel point of the curtain wall, and i represents the imaginary unit, ​respectively denote the horizontal and vertical coordinates of the cth liquid crystal pixel point in the curtain wall;

[0033] By establishing the Jacobian matrix and discretizing the Helmholtz equation, and simultaneously solving the least squares problem of the Helmholtz equation using the ADMM algorithm, the refractive index correction matrix of the liquid crystal pixel points is obtained; based on the refractive index correction matrix of the liquid crystal pixel points, the refractive index correction of each liquid crystal pixel point is extracted;

[0034] The curtain wall plane is divided into N x M liquid crystal pixel points (such as 5mm x 5mm), the finite difference method is used to discretize the Helmholtz equation in space, a linear equation set describing the propagation of light field is generated, a mathematical relationship between the complex amplitude of light field and the refractive index distribution is established, the difference between the target advertising brightness and the current light intensity is taken as the optimization objective, an L1 regularization term (to suppress refractive index jumps) is added, and a constrained least squares optimization problem is constructed, the objective is to minimize the brightness error while satisfying the hardware physical constraints; 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 the globally optimized refractive index correction matrix is output, and the refractive index correction of each liquid crystal pixel point is extracted from the correction matrix according to the liquid crystal pixel point position index.

[0035] The first estimated refractive index of each liquid crystal pixel point is obtained by adding the base refractive index of the glass curtain wall without applying voltage and the refractive index correction of each liquid crystal pixel point ; the second estimated refractive index of each liquid crystal pixel point is obtained by using the analysis formula .

[0036] The refractive index upper limit value and the refractive index lower limit value of the corresponding liquid crystal material of the glass curtain wall are obtained, and the actual refractive index of each liquid crystal pixel point is finally determined .

[0037] Through the three steps of base refractive index superposition, temperature compensation and physical constraint verification, it can be ensured that the actual refractive index of the liquid crystal pixel point can not only accurately reflect the required light field regulation effect, but also adapt to the change of environmental temperature, and always remain within the physical limit range of the liquid crystal material, so as to prevent display distortion or equipment damage caused by too high or too 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.

[0038] The logic for obtaining the actual driving voltage of each liquid crystal pixel point in the curtain wall is as follows:

[0039] ​Collect real-time ambient temperature T1, and based on the liquid crystal electro-optic response characteristics, the actual refractive index of each liquid crystal pixel point is deduced from the actual refractive index of each liquid crystal pixel point ;

[0040] In the above formula The liquid crystal threshold voltage is defined as the critical voltage at which the refractive index begins to change. The refractive index of the liquid crystal molecule is perpendicular to the arrangement and parallel to the arrangement, respectively. The refractive index drift caused by temperature is ;

[0041] The driving voltage of each liquid crystal pixel point is added to the temperature compensation term to obtain the driving compensation voltage value of each liquid crystal pixel point , The predefined voltage temperature coefficient describes the sensitivity of voltage change with temperature, and the typical value is taken as ;

[0042] Smooth the driving compensation voltage value of each liquid crystal pixel point to obtain the actual driving voltage of each liquid crystal pixel point :

[0043] , The minimum safe driving voltage and the maximum tolerance voltage are represented, respectively.

[0044] At the same time, a 3D binocular passenger flow counter is deployed at the entrance of the coffee shop to count the number of people outside the coffee shop per unit time, and the display brightness of the corresponding advertising content of the curtain wall is dynamically adjusted.

[0045] Using the monitoring instrument, the gaze focus area of each pedestrian is identified in real time, and by analyzing the change rate of the pupil focal length of each pedestrian and combining the moving speed of each pedestrian per unit time, the playing mode of the corresponding advertising content of the curtain wall is dynamically adjusted.

[0046] The change rate of the pupil focal length of each pedestrian is analyzed as follows:

[0047] Get the physiological Ives-Stark relationship law of pupil diameter and focal length , The pupil diameter under the reference focal length f0 is The pupil adjustment sensitivity coefficient f0 is the reference focal length, and f is the unknown focal length. The pupil diameter corresponding to the unknown focal length is represented as Take the derivative of it to get the change rate of the pupil diameter And the change rate of the pupil focal length The relationship is:

[0048] ;

[0049] It should be noted that the specific derivation process of the pupil diameter change rate is as follows:

[0050] Based on the physiological Ives-Stark relationship law of pupil diameter and focal length , the derivative of is obtained: ;

[0051] After conversion by chain rule:

[0052] ;

[0053] The central difference method is used to calculate the pupil diameter change rate , where △t is the sampling interval of the monitoring instrument, is the pupil diameter at t measurement time points, is the pupil diameter at t measurement time points plus sampling interval and t measurement time points minus sampling interval, respectively;

[0054] The pupil focal length change rate is obtained, and the calculation method of the pupil focal length change rate is the same.

[0055] The playing mode of the curtain wall corresponding to the advertisement content is divided into three-level abstract playing mode, two-level standard playing mode and one-level enhanced playing mode.

[0056] Focus the gaze focus area of each pedestrian, and focus the gaze focus area of each pedestrian on the liquid crystal glass curtain wall of the cafe on each target pedestrian. The total number H of target pedestrians is obtained;

[0057] If H = 0, the playing mode of the curtain wall corresponding to the advertisement content is enabled three-level abstract playing mode, and the playing logic of three-level abstract playing mode is to compress the playing time length of the advertisement content, and the key information is strengthened by stroboscopic;

[0058] If H 1, the moving speed of each pedestrian in unit time is obtained, and if at least one pedestrian has a moving speed in unit time less than the preset moving speed threshold, the playing mode of the curtain wall corresponding to the advertisement content is enabled one-level enhanced playing mode, and the playing logic of one-level enhanced playing mode is to use spatial projection technology to dynamically display the three-dimensional model of the coffee shop product. If the moving speed of each pedestrian in unit time is greater than the preset moving speed threshold, the playing mode of the curtain wall corresponding to the advertisement content is enabled two-level standard playing mode, and the playing logic of two-level standard playing mode is to dynamically adjust the playing frame rate of the curtain wall corresponding to the advertisement content based on the mean value of the pupil focal length change rate of all pedestrians.

[0059] If the play mode of the advertisement content corresponding to the curtain wall is enabled to be the three-level abstract play mode, the play time of the compressed advertisement content corresponding to the curtain wall is dynamically adjusted based on the original play time Sc of the advertisement content corresponding to the curtain wall , tanh(·) represents the hyperbolic tangent function, is the mean value of the pupil focal length change rate of all pedestrians;

[0060] In this mode, when the total number of target pedestrians H=0, the play 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 the case of rapid movement, the advertisement can still convey key information without being too long, and too long play time may cause the audience to lose interest;

[0061] Synchronously calculate the stroboscopic frequency of the key information in the three-level abstract play mode , v is the mean value of the moving speed of all pedestrians per unit time; the stroboscopic frequency of the advertisement content, used to attract the attention of pedestrians. The stroboscopic frequency will be adjusted according to the pupil focal length change rate and the moving speed of the pedestrians, in order to enhance the effectiveness of information transmission;

[0062] In this formula, the stroboscopic frequency is set between 8 to 10 Hz. The use of the Sigmoid function ensures smooth transition of the stroboscopic frequency, avoiding abrupt changes that may cause discomfort to the audience. By combining the pupil focal length change rate with the speed, we can dynamically adjust the stroboscopic frequency to adapt to changes in audience attention, ensuring that within this range, visual fatigue will not be caused;

[0063] If the play mode of the advertisement content corresponding to the curtain wall is enabled to be the two-level standard play mode, calculate the play frame rate of the advertisement content corresponding to the curtain wall ; the play frame rate of the advertisement content, which is dynamically adjusted with the change of the speed of the pedestrians and the pupil adjustment, the increase of the frame rate can make the picture more smooth, thereby improving the user's viewing experience;

[0064] Within this speed range, the frame rate of the advertisement is dynamically adjusted according to the pupil focal length change rate. 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 of the frame rate can make the advertisement content more attractive, especially when the pedestrians slow down, it can better capture their attention. The number 30 fps is the standard frame rate of video playback, and the increase of 36 fps is based on the need for smoothness of dynamic content, to ensure that the audience has a better experience when watching;

[0065] If the play mode of the advertisement content corresponding to the curtain wall is enabled to be the one-level enhanced play mode, calculate the scaling ratio of the three-dimensional model of the displayed product of the coffee shop In the augmented reality (AR) mode, the size of the three-dimensional model is adjusted according to the pupil focus change rate to ensure proper display and interaction effect of the model in the user's field of view, and the maximum zoom ratio can reach 1.5 times;

[0066] When the speed of the pedestrians is lower than the preset moving speed threshold, the three-dimensional model of the advertising content is scaled according to the focus change rate. The design of this mode aims to enhance the immersion of the AR experience, so that the model can be more vivid when the audience is looking at it. The selection of the number 0.5 is based on physiological research on focus adjustment, which shows that within a certain range, the pupil focus change is positively correlated with the model size change. The maximum zoom ratio is 1.5 times, which ensures that the audience can still effectively attract their attention when observing at close range.

[0067] Embodiment 2

[0068] As Figure 2 shown, a coffee shop-based store promotion and sales management system includes a display brightness adjustment module and a playback mode determination module, each of the above modules is connected through wired and / or wireless connection to realize data transmission between modules;

[0069] Display brightness adjustment module: install controllable refractive index liquid crystal glass curtain wall on the facade of the coffee shop, the curtain wall can dynamically adjust its refractive index according to the preset instructions, and at the same time combine the curtain wall with the real-time lighting information, thereby dynamically adjusting the display brightness of the curtain wall corresponding to the advertising content;

[0070] Playback mode determination module: use the monitoring instrument laid out to identify the gaze focus area of each pedestrian in real time, dynamically adjust the playback mode of the curtain wall corresponding to the advertising content by analyzing the pupil focus change rate of each pedestrian and combining the moving speed of each pedestrian in unit time.

[0071] It should be understood that in various embodiments of the present application, the size of the sequence number of the above processes does not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0072] It should be understood that determining B according to A does not mean that B is determined only according to A, but B can also be determined according to A and / or other information.

[0073] 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 can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0074] Finally: the above only for the preferred embodiments of the present application, and not for limiting the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included in the scope of protection of the present application.

Claims

1. A cafe-based door store promotion and sales management method, characterized by, The application relates to a coffee shop-based store promotion and sales management method. The application comprises the following steps: installing a controllable refractive index liquid crystal glass curtain wall on the outer facade of a coffee shop, dynamically adjusting the refractive index of the curtain wall according to preset instructions, combining the curtain wall with real-time illumination information, and dynamically adjusting the display brightness of the corresponding advertisement content of the curtain wall; Real-time monitoring instruments are used to identify the gaze focus areas of each pedestrian, the change rate of the pupil focal length of each pedestrian is analyzed, and the moving speed of each pedestrian in a unit time is combined to dynamically adjust the playing mode of the corresponding advertisement content of the curtain wall; The change rate of the pupil focal length of each pedestrian is analyzed as follows: Acquisition of the physiological Ives-Stark relationship law of pupil diameter and focal length , is the pupil diameter under the reference focal length f0, is the pupil accommodation sensitivity coefficient, f0 is the reference focal length, and f is the unknown focal length, is characterized as the pupil diameter corresponding to the unknown focal length; and the derivation is carried out, and the relationships of the pupil diameter change rate and the pupil focal length change rate are obtained respectively: ； Calculating the rate of change of pupil diameter using central difference method where Δt is the sampling interval of the monitoring instrument, P(t) is the pupil diameter at the tth measurement time point, P(t + Δt) and P(t - Δt) are the pupil diameters at the tth measurement time point plus and minus the sampling interval, respectively. Thus, the pupil focal length change rate According to the calculation method of the pupil focal length change rate, the pupil focal length change rates of each pedestrian are calculated.

2. The café-based store promotion and sales management method according to claim 1, characterized by, The display brightness of the corresponding advertisement content of the curtain wall is dynamically adjusted by calculating the actual refractive index of each liquid crystal pixel point in the curtain wall, then obtaining the actual driving voltage of each liquid crystal pixel point in the curtain wall, sending the actual driving voltage of each liquid crystal pixel point to a curtain wall control terminal, and finally controlling the curtain wall control terminal to adjust the display brightness of the advertisement content.

3. The café-based point-of-purchase promotion and sales management method according to claim 2, wherein The actual refractive index of each liquid crystal pixel point in the curtain wall is calculated as follows: The real-time solar irradiance Fz, incident zenith angle theta1, incident azimuth angle theta2, incident light wavelength lambda and curtain wall surface temperature T are extracted from real-time illumination information; A right-hand Cartesian coordinate system is established with the plane of the curtain wall as a reference to determine the two-dimensional coordinates of each liquid crystal pixel point in the curtain wall , c is the number of each liquid crystal pixel point; Thus, the components of the wave vector corresponding to each liquid crystal pixel point in the X-axis and Y-axis are calculated respectively by the following formula ;​ Based on the solar irradiance Fz and the curtain temperature T, the target brightness field of each liquid crystal pixel point is comprehensively calculated , The average value of the gray value matrix of the advertisement content corresponding to all frame images after time domain smoothing processing, The optical efficiency of the curtain, e is the natural constant, T0 is the set reference temperature, and a is the predefined temperature attenuation coefficient; τ is the Gamma correction coefficient, which is 2.2, used to adjust the brightness perception; Based on , the propagation constant of the light wave in the thickness direction of the liquid crystal layer , n is the base refractive index when no voltage is applied to the glass curtain wall; and generate a Jacobian matrix , j is the jth pixel point affected by the light intensity of the cth liquid crystal pixel point, which is simply denoted as each affected pixel point, CD and GD represent the length and width of each liquid crystal pixel point respectively, and △z is the thickness of the liquid crystal layer, is the incident light field complex amplitude of the jth affected pixel point, is the sensitivity of the jth affected pixel point to the output light intensity of the cth liquid crystal pixel point, and sinc is the sinc function; The refractive index correction matrix of the liquid crystal pixel point is obtained by establishing a Jacobian matrix and discretizing the Helmholtz equation, and using the ADMM algorithm to solve the least square problem of the Helmholtz equation; meanwhile, the refractive index correction of each liquid crystal pixel point is extracted from the refractive index correction matrix of the liquid crystal pixel point; The base refractive index of the glass curtain wall when no voltage is applied is added to the refractive index correction of each liquid crystal pixel to obtain the first predicted refractive index of each liquid crystal pixel. Using analytical formulas The second predicted refractive index of each liquid crystal pixel is obtained. ; Obtaining the upper limit value of the refractive index of the liquid crystal material corresponding to the glass curtain wall and the lower limit value , and finally determining the actual refractive index of each liquid crystal pixel point .

4. The café-based point-of-purchase promotion and sales management method according to claim 3, wherein The logic for obtaining the actual driving voltage of each liquid crystal pixel point in the curtain wall is as follows: Collect real-time ambient temperature T1, and based on liquid crystal electro-optic response characteristics, deduce the driving voltage value of each liquid crystal pixel point from the actual refractive index of each liquid crystal pixel point ; 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 in the perpendicular and parallel arrangements, respectively; is the temperature-induced refractive index drift, ; The driving voltage of each liquid crystal pixel point is superimposed with a temperature compensation term to obtain a driving compensation voltage value of each liquid crystal pixel point , is a predefined voltage temperature coefficient, describing the sensitivity of the voltage change with temperature; Smooth the drive compensation voltage value of each liquid crystal pixel point, and finally obtain the actual drive voltage of each liquid crystal pixel point : , respectively denote the minimum safe operating voltage and the maximum withstand voltage.

5. The café-based store promotion and sales management method according to claim 1, characterized by, The playing mode of the corresponding advertisement content of the curtain wall is divided into three levels of abstract playing mode, two levels of standard playing mode and one level of enhanced playing mode.

6. The coffee shop-based store promotion and sales management method according to claim 5, characterized in that: The gaze focus areas of each pedestrian are focused, and the pedestrians in the gaze focus areas of the liquid crystal glass curtain wall of the coffee shop are recorded as target pedestrians, and the total number H of the target pedestrians is obtained; If H=0, the playing mode of the corresponding advertisement content of the curtain wall is enabled to adopt the three-level abstract playing mode, and the playing logic of the three-level abstract playing mode is to compress the playing time length of the advertisement content, and to use frequency flash to strengthen the key information; If H 1, the moving speed of each pedestrian in a unit time is obtained, and if the moving speed of at least one pedestrian in a unit time is less than a preset moving speed threshold, a first-level enhanced playing mode is enabled for the playing mode of the advertisement content corresponding to the curtain wall, and the playing logic of the first-level enhanced playing mode is to dynamically display a three-dimensional model of the coffee shop product by using a spatial projection technology; if the moving speed of each pedestrian in a unit time is greater than the preset moving speed threshold, a second-level standard playing mode is enabled for the playing mode of the advertisement content corresponding to the curtain wall, and the playing logic of the second-level standard playing mode is to dynamically adjust the playing frame rate of the advertisement content corresponding to the curtain wall based on the mean value of the pupil focus change rates of all pedestrians.

7. The coffee shop-based store promotion and sales management method according to claim 6, characterized in that: If the three-level abstract playing mode is enabled for the playing mode of the curtain corresponding advertisement content, based on an original playing time Sc of the curtain corresponding advertisement content, a playing time of the compressed curtain corresponding advertisement content is dynamically adjusted tanh(·) represents a hyperbolic tangent function, is the mean value of the pupil focus change rate of all pedestrians; Synchronizing the strobe frequency of critical information in a three-level digest play mode v is the average speed of all pedestrians in a unit of time; If the curtain wall corresponds to the playing mode of the advertisement content, the secondary standard playing mode is enabled, the playing frame rate of the curtain wall corresponding to the advertisement content is calculated ; If the curtain corresponds to the playing mode of the advertisement content to enable the first level enhanced playing mode, the scaling ratio of the three-dimensional model of the display product corresponding to the coffee shop is calculated .

8. A cafe-based door store promotion and sales management system, characterized by, The coffee shop-based store promotion and sales management method is realized based on any one of claims 1-7, and comprises a display brightness adjustment module and a playing mode determination module, wherein the modules are connected through wired and / or wireless connection to realize data transmission between the modules; The display brightness adjustment module: installing a controllable refractive index liquid crystal glass curtain wall on the outer facade of a coffee shop, dynamically adjusting the refractive index of the curtain wall according to preset instructions, combining the curtain wall with real-time illumination information, and dynamically adjusting the display brightness of the corresponding advertisement content of the curtain wall; The play mode determining module uses the monitoring instrument to identify the focus area of each person in real time, analyzes the change rate of the pupil focal length of each person, and combines the moving speed of each person in a unit time to dynamically adjust the play mode of the corresponding advertisement content of the curtain wall.

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