Reflective Display Device Having Authentication Function and Control Method Thereof

Abstract

The present invention relates to a reflective display device based on electrophoretic technology, and aims to provide an anti-counterfeiting function by displaying general content under normal conditions and displaying hidden authenticity verification information only under specific conditions. To this end, the display device according to the present invention comprises a lower electrode layer including a 'lower electrode for information display' for displaying information and a 'lower electrode for authenticity verification' for displaying authenticity verification information. As a key feature, the lower electrode for authenticity verification is connected to an external voltage application terminal through separate wiring that is electrically completely isolated from the main driving board. Through this separated drive structure, authenticity verification information is completely hidden visually during normal operation, allowing the product's elegant design to be maintained. By applying a specific electrical signal to an external voltage application terminal via an authorized device only when authenticity verification is required, a hidden pattern (e.g., QR code, logo) can be displayed independently of the main drive system. This effectively provides robust hardware-based security performance that makes duplication through software hacking fundamentally impossible.

Description

Technology Field

[0001] The present invention relates to a reflective display based on electrophoretic technology, and more specifically, to a structure of a display device capable of displaying only general information under normal conditions and displaying hidden authenticity verification information only under specific conditions, and a method for controlling the same. Background Technology

[0002] Electrophoretic Displays (EPDs) are a technology that displays images by moving charged pigment particles within a dispersion medium in response to the application of an electric field. This technology offers visibility similar to paper and enables ultra-low power operation thanks to its bistability, which consumes power only when the screen changes. Due to these advantages, electrophoretic displays are widely used in various fields, including e-books, electronic price tags (ESLs), outdoor advertising, and information displays for various products. Initially, monochrome displays using black and white particles were predominant, but recently, the technology has evolved to enable color implementation by using color filter arrays or mixing particles of various colors.

[0003] Figures 1a, 1b, 1c, and 1d are cross-sectional views schematically illustrating the general color display principle of a reflective display.

[0004] Referring to Figures 1a, 1b, 1c, and 1d, an electrophoretic display using ink in which one or more charged particles are dispersed in a fluid can display various colors and information depending on the composition and structure of the applied display layer, ranging from simply adjusting the black and white contrast ratio to displaying colors through a combination of black and white particles and a color filter located above the display area, displaying colors through a combination of black and white particles and a color fluid, or displaying colors using the threshold voltage or response time deviation of particles of various colors. It also possesses bistable properties that maintain the final realized color or image for a long time even when the voltage is cut off by adjusting the charge amount of the particles and the viscosity of the fluid.

[0005] Electrophoretic displays require at least two electrodes to form an electric field by an externally applied voltage, as they electrically control the movement characteristics of particles according to the direction and strength of the electric field. A method may be used to form a display layer by filling a unit cell or subcell separated by a partition between the two electrodes with ink in which particles are dispersed in a fluid, or by microencapsulating the ink, coating it onto the electrodes, and drying it.

[0006] A reflective display contains a number of particles dispersed in a fluid by sealing them within a capsule or partition structure, and requires at least two electrodes for electrophoresis. The display largely comprises a common electrode (100) formed on a transparent upper substrate (107) and a number of pixel electrodes (101) formed on a lower substrate (108) in pixel units. Color is realized by controlling the movement characteristics of the particles by applying an electric field between the two electrodes.

[0007] Figure 1a is an example of a black-and-white reflective display, schematically illustrating the principle of displaying white.

[0008] Referring to FIG. 1a, the display layer has a structure in which positively (+) charged white particles (102) and negatively (-) charged black particles (103) are dispersed and sealed within a transparent fluid (104). The reflective display includes a plurality of particles sealed within a capsule or partition structure between a common electrode (100) formed on a transparent upper substrate (107) and a plurality of pixel electrodes (101) formed in pixel units on a lower substrate (108). For example, in the case of a black and white display, positively (+) charged white particles (102) and negatively (-) charged black particles (103) are dispersed within a transparent fluid (104).

[0009] When an electric field is applied between a common electrode (100) and a specific pixel electrode (101), white particles (102) and black particles (103) move up and down according to the direction of the electric field. If a positive (+) voltage is applied to the pixel electrode (101), the negatively (-) charged black particles (103) move downward and the positively (+) charged white particles (102) move upward, displaying white from the observer's perspective. Conversely, if a negative (-) voltage is applied to the pixel electrode (101), the black particles (103) move upward and display black.

[0010] FIG. 1b shows a structure in which a color filter (105) is arranged as an example of a reflective display for expressing colors using black and white particles.

[0011] Based on the black and white particle (102, 103) structure of FIG. 1a, a color filter (105) is additionally placed on an upper substrate (107). When the white particle (102) and the black particle (103) are controlled to drive white, light passes through the color filter (105) and is reflected by the white particle (102), and is recognized as the color of the filter, thereby realizing the color.

[0012] Figure 1c schematically illustrates a method of displaying colors by combining black and white particles and color fluids of a reflective display.

[0013] A display layer is formed by using a colored fluid (109) to surround the particles, along with a sealed display layer in which black particles (103) and white particles (102) are dispersed. Color display is possible by changing the arrangement and position of the black particles (103) and white particles (102) by controlling an electric field, thereby selectively exposing the color of the particles (e.g., white or black) or the color of the fluid.

[0014] FIG. 1d illustrates a method of displaying colors using a combination of various color particles (106) and black particles (103). Color particles (106) having various colors (e.g., red, green, blue, etc.) are dispersed within a transparent fluid (104) along with black particles (103). Each of the various color particles (106) may have a different threshold voltage or response time deviation, and by using this to precisely control the electric field, only specific color particles may move to the visible part or only specific color particles may move to the non-visible part, thereby enabling the realization of various colors and information.

[0015] Figures 2a and 2b are cross-sectional views showing examples of the structure of a display layer constituting a reflective display, schematically illustrating two representative structures according to the method of encapsulating ink containing particles and fluids.

[0016] The display layer is disposed between a common electrode (100) formed on a transparent upper substrate (107) and a pixel electrode (101) formed on a lower substrate (108) in pixel units, and includes ink in which a plurality of particles, such as black particles (103), white particles (102), or color particles (106), are dispersed within a transparent fluid (104). A voltage applied from the outside controls the movement characteristics of the particles inside the cell through the electric field formed by the common electrode (100) and the pixel electrode (101).

[0017] FIG. 2a is a cross-sectional view of a reflective display having a display layer with a partition structure.

[0018] FIG. 2a shows the structure of a display layer in which ink is partitioned using partitions (113).

[0019] The display layer has a structure in which ink containing a plurality of particles (e.g., black particles (103), white particles (102)) and a transparent fluid (104) is directly injected into a plurality of cells partitioned by a partition wall (113). The lower part of the cell can be attached to a lower substrate (108) through an adhesive layer (112). Within each cell partitioned by the partition wall (113), the particles move according to the direction and strength of the electric field formed between the upper common electrode (100) and the lower pixel electrode (101) to realize the color.

[0020] FIG. 2b is a cross-sectional view of a reflective display having a display layer with a microcapsule structure.

[0021] FIG. 2b shows the structure of a display layer in which ink is prepared and arranged in the form of microcapsules (110).

[0022] Ink containing a plurality of particles (e.g., black particles (103), white particles (102)) and a transparent fluid (104) can be manufactured in the form of microcapsules (110) and placed between an upper substrate (107) and a lower substrate (108). The microcapsules (110) are fixed by a binder (111) and can be attached to each substrate through an adhesive layer (112).

[0023] Inside each microcapsule (110), particles move and color is realized by an electric field formed between an upper common electrode (100) and a lower pixel electrode (101). FIG. 2 is a cross-sectional view showing an example of the structure of a display layer constituting such an electrophoretic display. Ink containing multiple particles and fluid can be manufactured in the form of microcapsules (110) and placed between an upper substrate and a lower substrate. These microcapsules (110) are fixed by a binder (111) and attached to each substrate through an adhesive layer (112). Alternatively, a method of directly injecting ink into a cell partitioned by a partition wall (113) may be used. In this structure, a voltage applied from the outside controls the movement characteristics of particles inside the cell through an electric field formed by the upper common electrode and the lower pixel electrode, and at least two electrodes are required for this purpose.

[0024] As the application of electrophoretic displays to high-value-added products, such as limited edition goods, packaging for premium products, and brand logo displays, increases, the importance of anti-counterfeiting technology to verify the authenticity of such products and protect intellectual property rights is emerging. Conventionally, methods such as attaching security labels, including QR codes, barcodes, and hologram stickers, to product packaging boxes or separate printed materials were mainly used.

[0025] However, these external attachment methods have the following drawbacks. First, QR codes or serial numbers can be easily replicated using high-resolution scanners or cameras and printed identically on counterfeit products, posing a fundamental limitation to their anti-counterfeiting capabilities. Second, holographic stickers detract from the product's aesthetic design and may deteriorate or peel off over time. Third, once the packaging is removed, the means of verifying authenticity disappears, making it difficult to prove the product's genuineness in second-hand transactions. Consequently, there has been a continuous demand for technical features that are difficult to duplicate and are embedded within the product itself.

[0026] To address these issues, methods for verifying authenticity using the display technology itself have been proposed.

[0027] Accordingly, research is actively underway to embed anti-counterfeiting functions into the display technology itself. In particular, electrophoretic displays are advantageous for application to anti-counterfeiting technology due to their characteristic of changing color or pattern in response to external stimuli.

[0028] For example, Korean Published Patent No. 2007 / 0112073 (Title: Electrophoretic display medium, device, and image display method using such device, link) discloses an electrophoretic display technology comprising colored particles of various colors, wherein particles of different colors selectively move according to the strength or shape of an applied electric field to realize various colors. This document demonstrates that complex images can be displayed through multi-color implementation (paragraph <183> , <195> (Reference), this pertains to general display driving methods and does not specifically teach about anti-counterfeiting functions that implement 'hidden information' that is not visible under normal conditions but appears only under specific conditions. In other words, since all displayed information is controlled by the same driving principle, there are limitations in independently controlling hidden security patterns.

[0029] Additionally, U.S. Patent No. 9188829 (Title: Electrophoretic Display for Anti-Counterfeiting Applications, Link) is a technology that focuses more on the anti-counterfeiting function itself. This patent is designed so that if a portion of the display film (barrier layer) is removed, the internal solvent evaporates, causing the display function to be permanently damaged after a certain period of time (see Claim 1). This provides a 'tamper-evident' function in which the display is deactivated when the product packaging is opened or the seal is broken. However, this technology is a one-time, irreversible method, and once the function is damaged, it cannot be restored. Therefore, it has an obvious limitation in that it fails to provide a dynamic authentication function that allows the user to repeatedly verify authenticity and hide it whenever necessary.

[0030] Meanwhile, Korean Published Patent No. 10-2016-0067057 (Title: Anti-counterfeiting and tampering device, link) discloses an anti-counterfeiting device using a magnetovariable material (e.g., photonic crystal) whose color changes according to a change in a magnetic field. This technology utilizes a principle in which a 'spacer' is interposed between a magnetic field generating unit and a magnetovariable material containing unit, and when the thickness or position of the spacer changes due to an external stimulus (pressure, rotation, etc.), the magnetic field applied to the magnetovariable material changes, thereby changing the color (see Claims 1, 10, and 16). While this is original in that it controls color through mechanical changes without electrical signals, it has the limitation that a magnetic field generating unit, such as a magnet, must always be carried or embedded in the device to induce color change. Furthermore, the implemented pattern is dependent on the shape of the magnetic field generating unit, and there are clear structural limitations to electrically displaying complex and precise information (e.g., QR codes) freely, such as in electrophoretic displays.

[0031] Finally, Korean Published Patent No. 10-2017-0124763 (Title: Anti-counterfeiting printed material containing optically variable material and method for manufacturing the same, link) discloses a technology for printing multilayer security patterns by combining various functional inks such as magnetic color-changing ink (MTX), optically variable ink (OVP), and UV ink (see Claims 1 and 9). This technology makes forgery difficult by responding in combination to various external stimuli such as magnetic fields, viewing angles (view-varying angles), and ultraviolet rays. However, since this technology is based on 'printing' technology, the pattern is fixed once printed. In other words, it cannot dynamically change or update information displayed via electrical signals, as in an electrophoretic display. Therefore, while this technology is useful for static anti-counterfeiting, it has limitations in implementing dynamic security functions, such as changing authentication information as needed or linking with communication functions.

[0032] In short, conventional technologies had the following problems: ① they dealt only with general display driving principles and lacked the concept of selective hiding and independent control of information; ② they relied on one-time and irreversible destruction methods; ③ mechanical operation or separate external equipment was essential; and ④ they were static printing methods that could not dynamically change information.

[0033] Therefore, there is an urgent need to develop reflective display technology with a more fundamental and enhanced security structure that can fully display product information or design under normal conditions, while repeatedly displaying or concealing hidden authenticity verification information controlled through a path completely independent of the product's main drive system, only under specific electrical conditions without separate external equipment. Prior art literature

[0034] 1. Republic of Korea Published Patent No. 2007 / 0112073 2. U.S. Registered Patent No. 9188829 3. Republic of Korea Published Patent No. 10-2016-0067057 4. Republic of Korea Published Patent No. 10-2017-0124763 The problem to be solved

[0035] The present invention was invented to solve the problems of the aforementioned prior art.

[0036] The first task is to overcome the limitations of conventional authentication methods, such as QR codes or security labels, which are exposed externally and can be easily duplicated or counterfeited. It is necessary to resolve the problem where authenticity information is always visible on the product's exterior, compromising its unique design and providing counterfeiters with an opportunity to replicate it.

[0037] The second challenge is to integrate the authenticity verification function without compromising the product's design completeness. As with existing methods, attaching separate stickers or constantly dedicating a portion of the display area to showing authenticity information detracted from the product's aesthetics.

[0038] The third task is to ensure that the genuine product verification function is not visible in normal usage environments so as not to interfere with the user's visual experience, and to make the hidden information appear only under specific conditions or methods where authentication is required. Through this, it is necessary to maximize security and make it difficult for counterfeit products to mimic the genuine product verification function.

[0039] The fourth task is to provide a non-destructive authentication method that can verify authenticity without physical destruction or disassembly. Some security technologies required damaging the product to access internal patterns, which had the problem of degrading the product's value.

[0040] Therefore, the objective of the present invention is to provide a reflective display device of a new structure that displays general information or content normally, but displays a hidden genuine product verification pattern or information only when specific electrical conditions are applied.

[0041] In addition, another objective of the present invention is to provide a control method that controls the display device to activate a genuine product verification function only through a separate, independent signal application method, which cannot be accessed by a general driving method.

[0042] Furthermore, another objective of the present invention is to prevent product counterfeiting through this authenticity verification function, and to protect brand value and secure consumer trust by clearly proving whether intellectual property rights have been infringed. means of solving the problem

[0043] A reflective display device according to one embodiment of the present invention comprises: a common electrode formed on an upper substrate; a lower electrode layer formed on a lower substrate, comprising at least one lower electrode for displaying information and at least one lower electrode for verifying authenticity for displaying authenticity information; and an electrophoretic display layer disposed between the common electrode and the lower electrode layer, wherein the lower electrode for displaying information is connected to a main driving board through a first wire, and the lower electrode for verifying authenticity can be connected to an external voltage application terminal through a second wire that is electrically insulated from the first wire.

[0044] The above-mentioned lower electrode for authenticity verification can be patterned in the shape of at least one of a QR code, a barcode, a logo, or a string.

[0045] The device is divided into an information display area in which the lower electrode for information display is placed and a genuine product verification display area in which the lower electrode for genuine product verification is placed, and the genuine product verification display area may not be visually perceived by maintaining a deactivated state or a background color state under normal circumstances.

[0046] The above external voltage application terminal may be formed at a location separate from the debugging port or general power input terminal of the main driving board.

[0047] A reflective display device according to one embodiment of the present invention comprises: an upper substrate; a lower substrate; and an electrophoretic display layer disposed between the upper substrate and the lower substrate. In the reflective display device, the lower substrate may further include, in addition to a lower electrode for displaying information, a printed pattern for authenticating a genuine product that is visually identifiable when the electrophoretic display layer is physically removed.

[0048] The electrophoretic display layer may further include a cut line formed to separate and remove an area corresponding to the genuine product verification print pattern.

[0049] A reflective display device according to one embodiment of the present invention comprises: a common electrode formed on an upper substrate; a plurality of lower electrodes formed on a lower substrate; an electrophoretic display layer disposed between the common electrode and the plurality of lower electrodes; and a main driving board that applies a driving signal to the lower electrodes. The main driving board includes a voltage sensing circuit that detects the level of an input voltage supplied to the main driving board, and the voltage sensing circuit may apply an electrical signal for authenticity verification, which is different from a driving waveform for information display, to at least a portion of the lower electrodes only when the input voltage exceeds a preset reference voltage.

[0050] The above reference voltage can be set to a value within the range of 5.5V to 8.0V.

[0051] A control method for a reflective display device according to an embodiment of the present invention comprises: (a) a step of applying a first electrical signal to a lower electrode for information display through the main driving board to display information; and (b) a step of applying a second electrical signal to a lower electrode for authenticity verification through an external voltage application terminal to display authenticity verification information when authenticity verification is required, wherein in step (a), no voltage is applied to the lower electrode for authenticity verification, and in step (b), the operation of the main driving board may be performed independently of the operation of the main driving board.

[0052] A control method for a reflective display device according to an embodiment of the present invention may include the step of supplying a first input voltage that is less than or equal to the reference voltage to the main driving board to display information; and the step of supplying a second input voltage that exceeds the reference voltage to the main driving board so that the voltage detection circuit detects it and displays genuine product verification information.

[0053] A product for verifying authenticity according to one embodiment of the present invention includes a reflective display device, wherein a color printing layer is disposed on the upper portion of the reflective display device, and the color printing layer may include a transparent color printing area corresponding to the information display area and a physically removable opaque color printing area corresponding to the authenticity verification display area.

[0054] At the time when the power of the main driving board is turned on or off, the method may further include a step of temporarily applying the electrical signal for authenticity verification to display authenticity verification information and then making it disappear. Effects of the invention

[0055] The reflective display device and the control method according to the present invention provide the following significant effects.

[0056] First, it provides significantly enhanced security. This invention physically and completely separates the drive path displaying general content from the drive path displaying authenticity verification information. Since the authenticity verification electrode is activated only through separate, independent wiring and external contacts without passing through the main drive board, it is fundamentally impossible to identify or mimic the signal driving the hidden pattern, even if the product's software or firmware is reverse engineered. This provides a powerful hardware-based anti-counterfeiting solution that goes beyond simple encryption or software-based security techniques.

[0057] Second, it preserves the design value and marketability of the product. Under normal circumstances, no markings for authenticity verification are exposed externally, allowing the entire display area to be fully utilized to express the product's unique information or design. This fundamentally resolves the issues of existing methods that detract from the product's aesthetics, such as holographic stickers or constantly exposed QR codes, thereby providing consumers with high aesthetic satisfaction and maintaining the product's premium value.

[0058] Third, it provides diverse and flexible authentication methods. In addition to the method of applying a direct electrical signal through an external contact, the present invention can activate the authenticity verification function through various triggers, such as detecting a specific voltage level, power on / off sequences, and physical separation. Through this, manufacturers can selectively apply the optimal authentication method depending on the type of product, security level, and usage environment. For example, it is possible to implement a multi-layered approach, ranging from functions that consumers can easily verify to high-level security functions that require specialized authentication equipment.

[0059] Fourth, it provides highly reliable and clear evidence. It clearly distinguishes from counterfeit products through an authenticity verification function inherent in the display itself that is extremely difficult to duplicate. This can be utilized as clear and powerful evidence in legal disputes in the event of intellectual property infringement, and effectively prevents damage to brand image and economic losses caused by the distribution of counterfeit goods.

[0060] Fifth, it possesses high compatibility with existing electrophoretic display manufacturing processes. The core of this invention lies in the design modification of the electrode and wiring patterns, which can be implemented through existing photolithography processes without significant additional costs. Since no special modifications are required for the electrophoretic particles or the display layer itself, high process compatibility with existing production facilities enables economical mass production. Brief explanation of the drawing

[0061] Figure 1 is a cross-sectional view schematically illustrating the general color display principle of a conventional reflective display. FIG. 2 is a cross-sectional view showing an example of the structure of a display layer constituting a conventional reflective display. FIG. 3a is a cross-sectional view schematically showing the structure of a reflective display device having a genuine product verification function according to one embodiment of the present invention. FIG. 3b is a front view schematically showing the structure of a reflective display device having a genuine product verification function according to one embodiment of the present invention. FIG. 4 is a schematic diagram showing examples of the general state and the state when verifying authenticity of a reflective display device according to one embodiment of the present invention. FIG. 5a is a schematic diagram showing a wiring structure for implementing independent control according to one embodiment of the present invention. FIG. 5b is a schematic diagram showing a driving method of a wiring structure for implementing independent control according to an embodiment of the present invention. FIG. 6a is a cross-sectional view of a reflective display device to which a color printed material according to one embodiment of the present invention is applied. FIG. 6b is a schematic diagram showing a procedure for verifying authenticity of a reflective display device to which a color printed material is applied according to one embodiment of the present invention. FIG. 6c is a schematic diagram showing the steps for implementing a genuine product verification mark of a reflective display device to which a color printed material is applied according to one embodiment of the present invention. FIG. 7a is a schematic diagram illustrating a method for verifying authenticity through the removal of a display layer according to an embodiment of the present invention. FIG. 7b is a schematic diagram illustrating a method for verifying authenticity by cutting off a portion of a reflective display panel according to one embodiment of the present invention. Specific details for implementing the invention

[0062] The present invention provides a novel structure and a control method thereof for incorporating a genuine product verification function into a reflective display device based on electrophoretic technology, which remains hidden under normal conditions but is activated only under specific conditions. The core of the present invention lies in designing a separate driving path for genuine product verification that is physically completely separated from the main driving system for information display, thereby implementing a multi-layered security system that is extremely difficult to duplicate or counterfeit.

[0063] A display device according to one embodiment of the present invention has a structure in which a display layer containing electrophoretic particles is disposed between an upper common electrode and a plurality of pixel electrodes formed on a lower substrate. At this time, according to the core features of the present invention, the electrodes of the lower substrate are functionally formed into two types.

[0064] The first is the 'lower electrode for information display,' which is arranged in the main display area for displaying typical text or images. These electrodes are controlled via wiring connected to the output terminals of the driving board, just like in a standard display.

[0065] The second is the 'sub-electrode for authenticity verification'. These electrodes are patterned in the shape of a pre-set authenticity verification pattern, such as a QR code, logo, or serial number, in a specific area that overlaps with or is completely separated from the main display area. As a most important feature, these sub-electrodes for authenticity verification are connected to an independent contact pad or connector that is connected to the outside through separate wiring that is electrically completely isolated from the output terminal of the main drive board.

[0066] Through this separated structure, under normal conditions, only the main drive board operates to apply a signal only to the lower electrode for information display, while no voltage is applied to the lower electrode for authenticity verification. Consequently, the authenticity verification pattern remains identical to the background color, remaining in a 'stealth' state that is completely undetectable from the outside. Only when authenticity verification is required does an authenticated user or device activate the hidden pattern by directly applying a specific drive voltage to the lower electrode for authenticity verification through an independent external contact. Because the drive path is physically completely separated in this way, it is fundamentally impossible to arbitrarily activate or duplicate the authenticity verification function even if the product's software or firmware is hacked, thereby ensuring a very high level of security.

[0067] In addition, the activation conditions for the authenticity verification function can be controlled in a more diverse manner. For example, by adding a separate control circuit, a 'one-time display' function can be implemented, which temporarily applies voltage to the lower electrode for authenticity verification only at the moment the product is first turned on (during initial boot-up) to briefly display a logo or authentication code before it disappears. This provides an intuitive experience that allows users to immediately verify the authenticity of the product when they first unbox and turn on the power.

[0068] In another embodiment, the present invention provides a method for verifying authenticity through physical modification. One method is to allow verification of authenticity only when the display layer is removed. In this case, in addition to the lower electrode for information display, a separate pattern or character for authenticity verification, manufactured using the same material and process, is printed or formed on the lower substrate. Normally, the pattern is completely obscured by the upper display layer and remains invisible, but the hidden pattern on the lower substrate can be visually confirmed only when the display layer is physically destroyed or separated.

[0069] Furthermore, to facilitate such physical verification, a perforation line can be pre-formed along the boundary of the display layer area where the authenticity verification pattern is located through partial die-cutting or laser cutting. By easily separating or removing only a portion of the display layer along this perforation line to check the pattern hidden underneath, the user can perform authenticity verification without damaging the entire product.

[0070] In another embodiment, the present invention provides a method for displaying authenticity verification information by using a specific state change of the main driving system as a trigger. For example, the design may be such that a specific electrical signal (e.g., a signal that flashes the entire screen at a specific frequency), which is different from a general image display driving waveform, is temporarily applied only at the moment when the power of the driving board controlling the main electrode layer that displays information and content is turned on or off. By making a hidden pattern appear in a specific area of ​​the display only when this special signal is applied, authenticity verification is made possible with only a simple operation of turning the power on or off.

[0071] Similarly, a circuit may be added to detect when the level of the input voltage supplied to the driving board changes above or below a specific value, so that an electrical signal different from the driving waveform for information display is applied only when such a voltage change occurs. For example, security can be further enhanced by displaying a hidden pattern only when a specific voltage supplied by the authentication device (e.g., 7V) is detected, rather than the standard USB voltage (5V).

[0072] Evaluation of genuine product verification pattern display characteristics based on input voltage level detection

[0073] The purpose of this test is to verify the reliability and operational accuracy of a function that detects level changes in the input voltage (V_in) supplied to the main driver board of a display device and displays a hidden genuine product verification pattern only within a preset specific voltage range.

[0074] To this end, a display device of the present invention (Example) with a built-in voltage detection circuit that generates an electrical signal for authenticity verification only when the input voltage exceeds 6.0V, and a general display device without such a circuit (Comparative Example) were manufactured. After applying various input voltages from 4.0V to 8.0V using a variable DC power supply, whether or not an authenticity verification pattern was displayed was observed.

[0075] As a result, the sample of the comparative example did not display an authenticity verification pattern under any voltage conditions. On the other hand, the sample of the example did not display an authenticity verification pattern at all when the input voltage was 6.0V or lower, but when a voltage of 6.1V or higher was applied, it clearly displayed an authenticity verification pattern with a 100% success rate. This demonstrates that the voltage detection circuit of the present invention operates accurately based on a clear threshold of 6.0V, that the hiding function is perfectly maintained in general usage environments such as standard USB voltage (5.0V), and that it functions reliably only under specific voltage conditions for authentication.

[0076] Security performance evaluation of genuine product verification patterns based on drive path separation

[0077] The purpose of this test is to verify whether the structure of the present invention, in which the driving wiring of the lower electrode for genuine product verification is physically and completely separated from the main driving board, can completely prevent unauthorized activation of the genuine product verification pattern in response to hacking attempts via the software or firmware of the main driving board.

[0078] To this end, a display device of the present invention (Example) in which the wiring for authenticity verification is physically separated from the main driving board, and a conventional display device (Comparative Example) in which all electrodes are connected to the same main driving board were fabricated. Subsequently, a hacking simulation was performed in which a driving signal was forcibly applied to all output channels through a debugging port connected to the main driving board of each sample.

[0079] As a result, the comparative example sample exhibited a security vulnerability in which a hidden genuine product verification pattern was unintentionally displayed through a hacking simulation. In contrast, the embodiment sample according to the present invention demonstrated perfect security performance, as no changes occurred in the genuine product verification area despite the same hacking simulation. This clearly demonstrates that the physically separated drive path structure of the present invention fundamentally neutralizes software hacking attempts, thereby providing significantly improved security performance compared to existing technologies.

[0080] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The following description is intended to illustrate the present invention and is not intended to limit the scope of protection of the present invention.

[0081] 1. Example 1: Independent authenticity verification electrode structure

[0082] Drawings 3a and 3b are a side view and a front view schematically illustrating the structure of a reflective display device having a genuine product verification function according to a first embodiment of the present invention.

[0083] The core of the present invention is to provide a display structure including a separate lower electrode with a separated function for authenticity verification.

[0084] FIG. 3a shows the cross-sectional structure of the display layer of a reflective display device having a genuine product verification function according to the present invention.

[0085] The display device comprises an upper substrate (310) (located above the common electrode) and a lower substrate (300) (located below the lower electrode) made of a transparent material arranged at a predetermined distance apart, and a display layer (e.g., black particles and white particles within a partition structure) in which electrophoretic particles are dispersed is formed in the space between them.

[0086] A transparent common electrode (Vcom) (301) for applying a common voltage from the observer side is formed on the inner surface of the upper substrate (310) over the entire active area.

[0087] On the inner surface of the lower substrate (300), a plurality of lower electrodes are formed, functionally divided into two groups. Lower electrode (302) for displaying content or information: Arranged in a matrix form within a content or information display area (320) that displays general content or information.

[0088] Lower electrode (303) for authenticity verification mark: is placed in an authenticity verification mark area (321) that is partitioned separately from the information display area (320).

[0089] The content or information display area (320) and the genuine product verification display area (321) share the same common electrode (301), but each electrode (302, 303) placed at the bottom is physically separated so that independent driving and control are possible.

[0090] FIG. 3b is a front view of the display layer of a reflective display device having a genuine product verification function according to the present invention. The lower electrode arrangement of the structure in FIG. 3a is shown together with a front view of the display layer attached to an upper substrate (panel).

[0091] On the lower substrate (300), lower electrodes (302) for displaying content or information, which are patterned in pixel units, are arranged, and separately, lower electrodes (303) for displaying genuine product verification are partitioned and arranged. On the lower substrate, a Vcom electrode connection area (322) of a Vcom electrode (304) for supplying potential to a common electrode (Vcom) may be provided. The lower electrodes (303) for displaying genuine product verification may be patterned in the shape of a pre-set genuine product verification pattern, such as a QR code, a logo, or a serial number. An area (323) to which an electrophoretic display layer is attached is shown on the upper substrate, and this area covers both the area of ​​the lower electrodes (302) for displaying content or information and the area of ​​the lower electrodes (303) for displaying genuine product verification on the lower substrate.

[0092] By separating the lower electrode in this way, it is possible to control the display so that only general information is displayed during normal operation, and a voltage is applied separately to the lower electrode (303) for genuine product verification only in specific environments or conditions to display a hidden genuine product verification pattern.

[0093] FIG. 4 shows examples of the normal state and the state of authenticity verification of a reflective display device according to the present invention. In normal state (left side of FIG. 4), the main driving circuit applies a driving signal only to the lower electrode (302) corresponding to the 'content or information display section' (400) to display general information. At this time, since no voltage is applied to the lower electrode (303) corresponding to the 'authenticity verification display section' (401), this area maintains a background color (e.g., white) state and is not visually perceived. On the other hand, if a separate driving voltage is applied only to the lower electrode (303) of the authenticity verification display section (401) through a specific authentication procedure, the hidden authenticity verification pattern is displayed as shown on the right side of FIG. 4.

[0094] FIGS. 5A, 5B, and 5C illustrate in detail examples of a wiring structure and a driving method for independently controlling a content or information display function and a genuine product verification display function in a reflective display device having a genuine product verification function according to the present invention.

[0095] Figure 5a shows an independent wiring structure of the lower electrode for the genuine product verification function.

[0096] Wiring for displaying content or information: Lower electrodes for displaying information (302, see Drawing 3a) are connected to lower electrode connection wiring (502) for displaying content or information, which is connected to the output terminal of a main drive board (not shown) through a drive board connection area (500) located at the bottom of the panel. This wiring (502) is continuously controlled while the user is using it for general content display.

[0097] Wiring for authenticity verification: Physically completely separated from the wiring (502) for displaying content or information, the lower electrodes (303, see Drawing 3a) for authenticity verification are connected to an independent contact or connector (not shown) that can be connected to an external authentication device (not shown) through a separate lower electrode connection wiring (501) for authenticity verification.

[0098] Through this separated wiring structure, the lower electrode (303) for authenticity verification can be driven independently by receiving voltage directly from the outside without going through the control path of the main drive system.

[0099] FIG. 5b is an example of a driving method indicating a state in which the lower electrode (303) for genuine product verification is not driven.

[0100] In normal or general usage environments, voltage is applied from the main drive board through the lower electrode connection wiring (502) for displaying content or information, so only the content or information display unit is driven. At this time, no voltage is applied to the lower electrode connection wiring (501) for authenticity verification (0V), or a voltage is applied that moves the particles to an inactive position, so that the authenticity verification display area (321, see Fig. 3a) remains hidden so that it is not displayed externally. Fig. 5b shows a state in which no voltage is applied to the lower electrode (303) for authenticity verification, so that particles are distributed at random locations and the content is not displayed externally, maintaining the panel's background color (e.g., gray), or the black particles move upward and black is displayed.

[0101] FIG. 5c is an example of a driving method that displays a hidden pattern by applying a specific voltage to a lower electrode (303) for authenticity verification when authenticity verification is required.

[0102] When authenticity verification is required, the external authentication device directly applies a specific voltage (e.g., +V, -V) to the lower electrode connection wiring (501) for authenticity verification. This voltage may be applied while the upper common electrode (100) is applied, or a voltage of different polarity (+V, -V) may be supplied between two or more separated lower electrodes (303) for authenticity verification without supplying voltage to the common electrode (100) to form a horizontal electric field, thereby displaying a specific color or information (e.g., QR code) (504).

[0103] Through this independent operation, a pre-set genuine product verification pattern (e.g., QR code image) is displayed in the genuine product verification display area (321) without passing through the main drive system at all. This is not affected by the firmware and software of the main drive system, and thus has the effect of increasing security against counterfeiting.

[0104] 2. Example 2: Anti-counterfeiting technology using an upper substrate structure

[0105] FIGS. 6a, b, and c illustrate an application technology of a reflective display device according to a second embodiment of the present invention. This embodiment is a method of further enhancing genuine product verification security by introducing a color printing layer on an upper substrate.

[0106] FIG. 6a shows the cross-sectional structure of a reflective display device to which a color print is applied. A color print layer is formed on the outer or inner surface of an upper substrate (310). This print layer consists of two regions with different characteristics. The first is a 'transmissive color print area' (600), which is formed at a location corresponding to the lower 'content or information display area' (320). This region is printed transparently or translucently so that light passes through and the color reflected from the display layer can be observed. The second is an 'opaque color print area' (601), which is formed at a location corresponding to the lower 'authenticity verification display area' (321). This region is printed opaquely so that no light passes through it at all, and normally physically completely covers the lower authenticity verification display area.

[0107] Authenticity verification using a color printout is performed through the procedure illustrated in FIG. 6b. First, the user prepares a panel (610) in which a lower substrate (300) and an upper substrate (310) are combined. A color printout (611) is attached to the upper part of this panel to form a reflective display device (612).

[0108] Fig. 6c shows the implementation step of a mark for authenticity verification.

[0109] Referring to FIG. 6c, the authenticity verification mark area is not visible under normal circumstances due to the 'opaque color printing area' (601). To verify authenticity, the 'opaque color printing area' (601) must be removed by a physical method (e.g., sticker removal, scratching, etc.). Only then can the hidden pattern (613) be verified by applying a separate voltage, as described in the steps for implementing the authenticity verification mark. This dual authentication process of 'physical removal' and 'electrical activation' makes forgery very difficult.

[0110] 3. Example 3: Verification of authenticity through physical separation

[0111] FIGS. 7a and 7b illustrate a method of verifying authenticity by physically separating a part of a reflective display device as a third embodiment of the present invention.

[0112] FIG. 7a illustrates a method for verifying authenticity by removing the display layer of a reflective display device (712). In this case, in addition to the lower electrodes for displaying information, a 'printed pattern for authenticity verification' (700) is directly formed on the lower substrate (300) using the same material and process. This pattern may not be an electrode, but is a simple pattern printed with a metal layer identical to that of the electrode. Normally, it is hidden and not visible by the upper substrate (720) which includes the display layer. To verify authenticity, the upper substrate (720) must be physically destroyed or separated and removed so that the printed pattern (700) hidden on the lower substrate (300) can be visually inspected. This is an irreversible method and can be usefully employed to prove ownership of a product or to verify that it is the original genuine product during a second-hand transaction.

[0113] FIG. 7b describes a method for verifying authenticity by cutting off a portion of the panel of a reflective display device (712). In this case, a 'cut line' (701) is formed along the boundary of a specific area where authenticity verification information is displayed. This cut line can be pre-processed using laser cutting or fine perforation. When authenticity verification is required, the user can check for authenticity by tearing off a portion of the panel along this cut line (701). At this time, the authenticity information printing pattern (700) may be displayed on the torn piece itself, or the information may be revealed on the remaining part after tearing. This can serve as a certificate of authenticity proving that a specific part of the product is authentic.

[0114] 4. Test Example 1: Evaluation of Authenticity Verification Pattern Display Characteristics Based on Input Voltage Level Detection

[0115] 1. Purpose of the Exam

[0116] The purpose of this test is to verify the reliability and operational accuracy of a function that detects changes in the level of the input voltage (V_in) supplied to the main driver board of a display device, thereby displaying a hidden authenticity verification pattern only within a preset specific voltage range. In particular, it aims to demonstrate the validity of a threshold voltage where the authenticity verification pattern is never displayed at normal operating voltages (e.g., standard USB voltage 5V) and is clearly displayed only when a specific voltage for authentication (e.g., 7V) is applied. Through this, hardware-based enhanced security performance that cannot be accessed via software or general driver signals is verified.

[0117] 2. Test Design and Method

[0118] A. Preparation of test samples

[0119] According to the present invention, a sample of a reflective display panel with an embedded input voltage sensing circuit is fabricated. The circuit is designed as follows.

[0120] Voltage sensing circuit: Includes a comparator circuit that monitors the input voltage (V_in). The reference voltage (V_ref) of the comparator is set to 6.0V.

[0121] Pattern driving logic: When the input voltage (V_in) is higher than the reference voltage (V_ref) (V_in > 6.0V), the logic circuit is activated and applies a preset driving waveform (e.g., alternating +15V / -15V) to the lower electrode for authenticity verification. When V_in ≤ 6.0V, the logic remains deactivated and does not apply any voltage to the lower electrode for authenticity verification.

[0122] Comparative Example: The comparative example sample is fabricated as a standard electrophoretic display panel without such voltage sensing circuits and pattern driving logic.

[0123] B. Test Procedure

[0124] Prepare display samples corresponding to each test group and comparison group.

[0125] Using a variable DC power supply, apply the input voltage (V_in) specified in Table 1 to the main drive board input terminal of each sample.

[0126] After applying voltage, observe with the naked eye and an optical microscope whether the 'information display area' is operating normally and whether the 'genuine product verification area' displays a pattern for 5 seconds.

[0127] If the 'information display area' operates normally, it is recorded as 'normal operation'; otherwise, it is recorded as 'malfunction'.

[0128] If the preset QR code pattern in the 'Authenticity Verification Area' is clearly and completely displayed, it is recorded as 'Display Success (O)'; if only part of it is displayed or it is faintly displayed, it is recorded as 'Incomplete Display (△)'; and if it is not displayed at all, it is recorded as 'Display Failure (X)'.

[0129] Repeat the test on 10 samples for each condition and record the success rate.

[0130] 3. Test Results

[0131] Result of Authenticity Verification Pattern Display According to Input Voltage Level

[0133]

[0134] 4. Analysis of Results and Critical Significance

[0135] A. Result Analysis

[0136] The test results are as shown in Table 1.

[0137] From Comparative Example 1 to Example 2, that is, when the input voltage (V_in) ranged from 4.0V to 6.0V, the information display area operated normally in all cases, but the genuine product verification pattern was never displayed. This clearly demonstrates that within the general usage voltage range, including the standard USB voltage of 5.0V, the genuine product verification function of the present invention remains completely hidden.

[0138] On the other hand, starting from Example 3, where the input voltage was applied at 6.1V, which exceeds the reference voltage (6.0V), the genuine product verification pattern was clearly displayed with a 100% success rate along with normal operation of the information display area. This was observed identically at voltages of 7.0V and 8.0V. This result demonstrates that the voltage sensing circuit according to the present invention operates accurately based on a clear threshold of 6.0V.

[0139] Meanwhile, the sample of Comparative Example 5, which lacks the voltage sensing circuit of the present invention, did not display any genuine product verification pattern even when the target authentication voltage of 7.0V was applied. This demonstrates that a specific circuit configuration according to the present invention is essential to display a hidden pattern.

[0140] B. Critical Significance of Numerical Limitation

[0141] This test example clearly demonstrates the critical significance of the numerical limitation of 'input voltage exceeding a specific reference voltage (V_ref)' in the technical features of the present invention.

[0142] The key point of the present invention is to set the reference voltage to a specific value (6.0V in this test example) that is higher than the upper limit of the general operating voltage range (e.g., 3.3V to 5.5V) and within the allowable voltage range of the driving circuit.

[0143] V_in ≤ 6.0V range: In this range, the genuine verification pattern does not manifest at all. This means that it is impossible for a general user or a potential counterfeiter to access the hidden function using the power typically used (PC USB port, standard adapter, etc.). This achieves the technical effect of perfect implementation of the 'Stealth' function.

[0144] V_in > 6.0V range: In this range, the authenticity verification pattern is executed with 100% confidence. This means that authenticity verification is possible only through dedicated authentication equipment capable of supplying a specific voltage (e.g., 7.0V). Since authentication is performed via a specific voltage level acting as a hardware 'key' rather than a software approach, it provides significantly enhanced security performance compared to existing technologies.

[0145] In conclusion, the threshold voltage of 6.0V acts as a boundary that clearly distinguishes between 'normal usage mode' and 'authentication mode'. Since the display of the genuine product verification pattern differs significantly at this threshold point, this numerical limitation is an essential component for achieving the technical effects of the present invention and plays a decisive role in simultaneously implementing significant effects that cannot be predicted by simple numerical changes, namely 'perfect hiding function' and 'enhanced hardware security function'.

[0146] 5. Test Example 2: Evaluation of Security Performance of Authenticity Verification Patterns Based on Separation of Execution Paths

[0147] 1. Purpose of the Exam

[0148] The purpose of this test is to verify whether the structure of the present invention, in which the driving wiring of the lower electrode for genuine product verification is physically and completely separated from the main driving board, can completely prevent the unauthorized activation of the genuine product verification pattern in response to hacking attempts via the software or firmware of the main driving board. Through this, we aim to demonstrate the superiority of the fundamental security performance provided by the separation of the driving path.

[0149] 2. Test Design and Method

[0150] A. Preparation of test samples

[0151] Example Sample (Invention): As described in Claim 1, the 'information display lower electrode' is connected to the main driving board, and the 'genuine product verification lower electrode' is manufactured by separating the wiring to a separate external connection terminal (pad) that is not connected to the main driving board.

[0152] Comparative example sample: As with the prior art, the 'information display lower electrode' and the 'genuine product verification lower electrode' are both manufactured by connecting them to the output channel of the same main driving board. However, the firmware controls the system software so that a driving signal is not sent to the channel corresponding to the genuine product verification electrode under normal circumstances.

[0153] B. Test Procedure

[0154] Ten samples each of the example and comparative example are prepared.

[0155] A hacking simulation program is executed to forcibly apply driving signals to all output channels driving the display through the debugging port connected to the main driving board of each sample.

[0156] Hacking simulation: Attempt to forcibly drive all connected electrodes by sequentially applying an active (ON) signal to all pixel driving lines (data lines and gate lines) of the driving board.

[0157] During program execution, pattern changes in the 'information display area' and 'genuine product verification area' are observed in real time.

[0158] If the QR code pattern hidden in the 'Authenticity Verification Area' is unintentionally displayed, it is recorded as 'Security Failure (X)', and if it is not displayed at all, it is recorded as 'Security Success (O)'.

[0159] Separately, the 'normal operation' is verified by checking whether the genuine product verification pattern is displayed correctly when a normal authentication procedure is performed through the independent external connection terminal (Example) or main driving board (Comparative Example, firmware command) of each sample.

[0160] 3. Test Results

[0161] Security Performance Evaluation Results of Genuine Product Verification Patterns for Hacking Simulations

[0162]

[0163] 4. Analysis of Results and Critical Significance

[0164] A. Result Analysis

[0165] The test results showed a clear difference as shown in Table 2.

[0166] In the case of the comparative example samples, although the firmware was normally configured not to operate the genuine product verification area, when a hacking simulation was executed in which a forced driving signal was applied to all output channels, part or all of the hidden genuine product verification pattern was unintentionally displayed in all 10 samples. This clearly demonstrates that as long as the genuine product verification electrode is physically connected to the main driving board, software defenses can be bypassed and a fundamental vulnerability exists in security.

[0167] On the other hand, in the case of the sample of the embodiment according to the present invention, even though the same hacking simulation was performed, the 'information display area' displayed an abnormal screen due to the forced driving signal, while the 'genuine product verification area' remained perfectly hidden without any change in all 10 samples. This proves that since the lower electrode for genuine product verification is not physically connected to the main driving board, no electrical influence can be exerted on the genuine product verification area no matter how much the main driving board is controlled. At the same time, it was confirmed that there is no problem with the function itself, as the pattern is perfectly displayed during a normal authentication procedure through a separate external connection terminal.

[0168] B. Critical Significance of the 'Physical Separation of Drive Paths' Configuration

[0169] This test example clearly demonstrates the critical significance of the 'physical separation of the driving path,' which is a core component of the present invention.

[0170] Overcoming the limitations of software security: Conventional methods that control access solely through software within the same hardware (driver board) can be bypassed by various methods such as firmware analysis, debugging port access, and forced signal application. However, the 'physical separation' of the present invention fundamentally neutralizes all such software hacking attempts. This is a significant effect that creates a difference between 'possibility and impossibility'.

[0171] Fundamental Change in the Definition of Security: This invention shifts the security level of a genuine product verification function from the issue of "how difficult it is to decipher" to the issue of "whether it is physically inaccessible." In other words, even if a counterfeiter knows both the shape and the driving waveform of the genuine product verification pattern, it is impossible to duplicate and display the pattern because there is no physical path to apply the signal. This provides a level of security that is on a completely different dimension from existing technologies.

[0172] In conclusion, the configuration of 'physical separation of the drive path' is not an optional improvement, but an indispensable core component for overcoming the fundamental vulnerabilities of software-based control methods and achieving the objective of the present invention, which is to prevent unauthorized copying.

Claims

Claim 1 A reflective display device comprising: a common electrode formed on an upper substrate; a lower electrode layer formed on a lower substrate, comprising at least one information display lower electrode for displaying information and at least one genuine product verification lower electrode for displaying genuine product verification information; and an electrophoretic display layer disposed between the common electrode and the lower electrode layer, wherein the lower electrode is divided into an information display area in which the information display lower electrode is disposed and a genuine product verification display area in which the genuine product verification lower electrode is disposed, wherein the information display lower electrode is connected to a main driving board through a first wiring, and the genuine product verification lower electrode is connected to an external voltage application terminal through a second wiring that is electrically insulated from the first wiring. Claim 2 A reflective display device according to claim 1, wherein the lower electrode for authenticity verification is patterned in at least one shape among a QR code, a barcode, a logo, or a string. Claim 3 A reflective display device according to claim 1, characterized in that the genuine product verification indicator area normally remains in a deactivated state or background color state so as not to be visually perceived. Claim 4 A reflective display device according to claim 1, characterized in that the external voltage application terminal is formed at a location separated from the debugging port or general power input terminal of the main driving board. Claim 5 A reflective display device comprising: an upper substrate; a lower substrate; and an electrophoretic display layer disposed between the upper substrate and the lower substrate, wherein at least one lower electrode for displaying information is formed on the lower substrate, and the lower substrate further comprises, in addition to the lower electrode for displaying information, a printed pattern for authenticity verification that is visually identifiable when the electrophoretic display layer is physically removed, and is divided into an information display area in which the lower electrode for displaying information is disposed and an authenticity verification area in which the printed pattern for authenticity verification is disposed. Claim 6 A reflective display device according to claim 5, wherein the electrophoretic display layer further comprises a cut line formed to separate and remove an area corresponding to the printed pattern for authenticity verification. Claim 7 A reflective display device comprising: a common electrode formed on an upper substrate; a plurality of lower electrodes formed on a lower substrate; an electrophoretic display layer disposed between the common electrode and the plurality of lower electrodes; and a main driving board that applies a driving signal to the lower electrodes, wherein the main driving board includes a voltage sensing circuit that detects the level of an input voltage supplied to the main driving board, and the voltage sensing circuit applies an electrical signal for authenticity verification, which is different from a driving waveform for information display, to at least a portion of the lower electrodes only when the input voltage exceeds a preset reference voltage. Claim 8 A reflective display device according to claim 7, characterized in that the reference voltage is set to a value of 0.5V or more relative to the input voltage for information display. Claim 9 A method for controlling a reflective display device according to claim 1, comprising: (a) a step of applying a first electrical signal to a lower electrode for information display through the main driving board to display information; and (b) a step of applying a second electrical signal to a lower electrode for authenticity verification through an external voltage application terminal to display authenticity verification information when authenticity verification is required, wherein in step (a), no voltage is applied to the lower electrode for authenticity verification, and in step (b), the method is performed independently of the operation of the main driving board. Claim 10 A method for controlling a reflective display device according to claim 7, comprising: a step of supplying a first input voltage that is less than or equal to the reference voltage to the main driving board to display information; and a step of supplying a second input voltage that exceeds the reference voltage to the main driving board so that the voltage detection circuit detects it and displays genuine product verification information. Claim 11 A product for verifying authenticity, comprising a reflective display device according to any one of claims 1 to 6, wherein a color printing layer is disposed on the upper portion of the reflective display device, and the color printing layer comprises a transparent color printing area corresponding to the information display area and a physically removable opaque color printing area corresponding to the authenticity verification display area. Claim 12 A control method for a reflective display device according to claim 9 or 10, characterized by further including the step of temporarily applying the genuine product verification electrical signal at the time when the power of the main driving board is turned on or off to display genuine product verification information and then making it disappear.

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