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An electronic shelf label (ESL) system is used by retailers for displaying, typically on the front edge of retail shelving, product pricing on shelves that can automatically be updated or changed under the control of a central server.[1]
A shelf label with electronic paper displayESL tag modules use electronic paper (E-paper) or liquid-crystal display (LCD) to show the current product price to the customer. E-paper is widely used on ESLs as it provides crisp display and supports full graphic imaging while needing only power during updates, but no power to retain an image. A communication network from the central server allows the price display to be automatically updated whenever a product price is changed, in contrast to static placards. Wireless communication must support application range, speed, battery life, and reliability. The means of wireless communication can be based on radio, infrared or even visible light communication.[2] Currently, the ESL market leans heavily towards radio frequency communication.[citation needed]
History
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Early product
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An early System first offered for sale by NCR in 1997 used Modulated Backscatter of radio waves to provide two way wireless communications between the labels and the store’s radio network. By using modulated backscatter, the labels confirmed receipt of price changes (along with battery and display status) without the need for an active radio transmitter, thus saving cost and increasing battery life to over 5 years.[3]
First generation: LCD and infrared communication
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7-segment LCD ESL tags use a display similar to how a calculator displays the numerical values. The numerical value to display on the tags itself are then shown based on activating different combinations of these seven bars and segments. A disadvantage of using a liquid crystal displayated tag is the difficulties in displaying certain letters.[4] The communication technology used for the transmitter to connect to the label is through diffused infrared communication. The values on the LCD tags are established by infrared bouncing off of surfaces. However, the speed of transmission is heavily compromised due to the data compression of each data packets from the transmitter.[5] Another disadvantage is that LCDs need power to retain an image.
Second generation: e-paper and infrared or radio communication
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Electronic paper (E-paper, electronic ink, or e-ink) describes a technology that mimics the appearance of ordinary ink on paper. An e-paper display is made up of multiple capsules in a thin film with Electrodes placed above and below the capsule film and when a charge is applied to an individual electrode, the color particle moves to either the top or bottom of the capsule, allowing the ESL to display a certain intensities of color within the capsule.[6] E-paper generally uses an infrared or radio communication network to communicate from the central server transmitter to the tags. Typically, low frequency radio solutions are used for tags, but with the draw backs of low data rate that makes it difficult to show complex segmented images.[5]Building information modeling
Third generation: geo-location and product finder
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The current generation of ESL units utilize e-paper display technology along with wireless radio communications, are integrated with existing retail technologies such as electronic article surveillance, digital signage, and people counters. Therefore, retailers are able to upload a floor plan of the sales area into the label-management software. Once this has been done and all the hardware and other software pieces are in place, consumers can be automatically tracked (in real time) through the network of people-counting devices, or via their personal Bluetooth devices, in order to determine their positioning within the store at all times; allowing the individual customer to be subjected to targeted, customized marketing initiatives: discounts, individual pricing, etc.[7]
General principles
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Concept display of the connection between the label management software, communication station, and terminal display in a mock-up retail environmentA typical ESL utilizes ultra-low-power CPU and wireless communication solutions to meet low power of low cost constraints in order to displace the high number of static shelf labels required in an average retail store.
ESL consists of three components:
Hardware design
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ESL hardware design generally includes the circuit design of the communication station and the terminal display label. The typical chipset used to perform the basic functional requirement of ESL's is the TI MSP432 or a solution from Silicon Labs. Typical communication between the communication station and the terminal display label is controlled by a RF module, the general protocol for RF module uses CC2500 with a communication distance of upwards to 30 meters.[9] For terminal display, it can be displayed via electronic ink, electronic paper or liquid crystal display.
Software design
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An ESL software API is included in the bluetooth 5.4 specification permits a 7-bit group identifier of 8-bit unique ESL ID's allowing for a total of 32,640 ESL's to be allocated for one bluetooth ESL network.[11] Multiple bluetooth ESL networks would be necessary in the same location to cover typical grocery store ESL applications.[12]
Usage
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Electronic shelf labels are primarily used by retailers who sell their products in stores and are usually attached to the front edge of the retail shelves and display the price of the product.[1] Additional information such as stock levels, expiration dates, or product information may also be displayed as well, depending on the type of ESL.[13]
Benefits
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Automated ESL systems reduce pricing management labor costs, improves pricing accuracy and allows dynamic pricing. Dynamic pricing is the concept in which retailers can fluctuate pricing to match demand, online competition, inventory levels, shelf-life of items, and create promotions.[14] Some advantages of using electronic shelf labels are
Disadvantages
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While there are benefits to ESL, it is not without its flaws. Some disadvantages of using electronic shelf labels are:
Market trends
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The global ESL market throughout 2027 is forecast to grow more than 16% CAGR.[22][23] The wide range of users ranges from grocery stores, hardware stores, sports equipment, furniture, consumer appliances, and electronic and gadgets. Forecast growth is primarily due to reduction in pricing over time.[24][25]
With the rapid increase in the inclusion of Internet of things technology in the retail industry, over 79% of retailers in the North America alone expect to invest in ESL and people counters. 72% of these retailers in North America have plans to reinvent the supply chain management through adoption of ESL in their stores, thereby accelerating the market growth of ESL. Further studies show that Europe currently dominates the ESL market in terms of size, with over one-third of the total market share in 2017, due to the strong presence of domestic and multinational retailers in the region, Diebold Nixdorf AG, and Displaydata.[26] However the market in APAC is expected to grow at the highest CAGR within the forecast period. The ESL market in the APAC region is segmented into territories with significant market potential, China, Japan, Australia, Singapore, South Korea, and the rest of the region.[27] Additionally, growth focuses on the expansion of large scale retailers in the region.[28] A study led by ABI Research states the global ESL market could reach US$2 billion by 2019(actual achieved marketshare in 2019 of $631 million), but a further study led by Fortune Business Isights expect the ESL market to reach $2.85 billion by 2027.[29][30]
References
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