Passive-driven multi-unit multi-color display label and printing preparation method thereof
By printing electrochromic materials and common electrodes with different potentials on a substrate, multi-unit multicolor display labels solve the problems of complex structure and monochrome display in the prior art, realize passive-driven multicolor display and simplified manufacturing, and are suitable for smart packaging products.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-29
- Publication Date
- 2026-03-24
AI Technical Summary
Existing electronic display labels require complex thin-film transistor backplanes and continuous external power supply, resulting in complex structures, high costs, and difficulty in achieving flexibility and large-area printing manufacturing. At the same time, the display status of simple visual indicator labels passively depends on environmental changes, cannot actively and controllably switch multi-color information, and has limited interactivity and functionality.
The passively driven multi-unit multi-color display label utilizes electrochromic materials and common electrodes with different potentials to fabricate independent color display units and conductive layers on a substrate through a printing process, achieving multi-color display without the need for an external power supply.
It achieves self-powered multi-color display, simplifies the manufacturing process, reduces costs, and enhances information capacity and interactive potential, making it suitable for smart packaging products.
Smart Images
Figure CN121725699A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the field of printed electronics, and relates to passive display technology, in particular to a multi-unit multi-color display label driven by a passive method and a printing preparation method thereof. BACKGROUND
[0002] In the current field of intelligent packaging, Internet of Things and human-computer interaction, electronic display labels as the key carriers of information visualization and dynamic interaction have attracted extensive attention.
[0003] However, common electronic display labels, such as products based on liquid crystal or electronic paper technology, usually require complex thin-film transistor backplanes and continuous external power supply, resulting in complex structure, high manufacturing cost and difficulty in realizing true flexibility and large-area printing manufacturing. Another type of simple visual indication label (such as thermochromic and photochromic labels) has a simple structure, but its display state is usually passively dependent on environmental changes, and most of them can only realize single-color switching, and cannot realize active and controllable multi-color information switching, with limited interactivity and functionality. Therefore, it is of important application value to develop a display technology with simple manufacturing process, low cost, self-powered driving and multi-color and reconfigurable display. SUMMARY
[0004] The present application aims to overcome the problems existing in the prior art, and provides a multi-unit multi-color display label driven by a passive method and a printing preparation method thereof. The prepared label does not rely on external power supply and can realize multi-color display, and the preparation method has a simple process.
[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions: A multi-unit multi-color display label driven by a passive method comprises a substrate layer, a plurality of independent color display units printed on the substrate layer, a plurality of independent conductive layers printed on the substrate layer at the gaps between the color display units, the conductive layers being arranged separately from the color display units, a first common electrode and a second common electrode printed on different conductive layers, and a transparent transmission layer and a protective layer covering the color display units, the first common electrode and the second common electrode in turn from bottom to top. The color display unit printing ink is an electrochromic material, the first common electrode and the second common electrode have a potential difference with the color display unit material, and the transparent transmission layer is used to provide the electrolyte required for the electrochromic reaction of the color display unit. The potential of the first common electrode is lower than that of the color display unit material, and the potential of the second common electrode is higher than that of the color display unit material. Different color display units are connected to the first common electrode 4 or the second common electrode 5 through wires, so as to drive the color display units to change color.
[0006] Preferably, the printing ink preparation method of the color display unit is as follows: a polymer mixture is prepared by mixing a 1.3% by mass poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate aqueous dispersion and a 1.3% by mass polyaniline-polystyrene sulfonate aqueous dispersion at a mass ratio of (3~9):(1~7), and then mixing and stirring the polymer mixture with diethylene glycol monomethyl ether and 3-pentanol at a mass ratio of (80~90):(3~8):(5~15).
[0007] Preferably, the first common electrode is printed using a mixture of zinc powder and conductive carbon paste in a mass ratio of (5~12):(8~15).
[0008] Preferably, the second common electrode is printed using a mixture of manganese dioxide powder and conductive carbon paste in a mass ratio of (5~12):(8~15).
[0009] Preferably, the transparent transmission layer is formed by coating the color display unit, the first common electrode, and the second common electrode with a gel precursor solution prepared by zinc perchlorate, polyvinyl alcohol, deionized water, and dimethyl sulfoxide in a mass ratio of (1~3):1:4:4.
[0010] Preferably, the protective layer material is one of polyethylene naphthalate, polyethylene terephthalate, polyethylene, and polypropylene.
[0011] Preferably, the base layer is one of coated paper and digital proofing paper.
[0012] A method for printing and preparing a passively driven multi-unit multi-color display label includes the following steps: Step 1: Gravure print the color display unit printing ink onto the substrate layer, and dry it at 80~110℃ for 30~60 minutes to form multiple independent color display units; Step 2: Add trifluoroacetic acid to the surface of the color display unit described in Step 1, and then allow it to air dry at room temperature for 30-60 minutes. This is the final processing step. Step 3: Screen print conductive silver paste onto the substrate layer, ensuring that the printing area does not overlap with the printing area of the color display unit. After drying at 100~120℃ for 30~60 min, a conductive layer is formed. Step 4: Screen print the first common electrode paste in the predetermined area of the conductive layer and dry it at 100~120℃ for 1~2 h to form the first common electrode; screen print the second common electrode paste in the predetermined area of the conductive layer and dry it at 100~120℃ for 1~2 h to form the second common electrode. Step 5: Cover the color display unit and the first common electrode and the second common electrode with transparent transport layer material to form a transparent transport layer; Step 6: Cover the transparent transmission layer with the protective layer material and seal the surrounding area with hot melt adhesive to obtain the passively driven multi-unit multi-color display label. Preferably, in step 1, the anilox roller used for gravure printing has a screen ruling of 100-200 l / in and a printing pressure of 400-700 N.
[0013] Preferably, the screen printing plate used in steps 3 and 4 has a mesh size of 200 to 400, and the squeegee used has a Shore hardness of 70 to 90.
[0014] Compared with the prior art, the present invention has the following beneficial technical effects: The multiple independent color display units of this invention are made of electrochromic materials. By connecting each color display unit to a conductive layer beneath different common electrodes, each color display unit can be actively and reversibly driven to switch between different colors. This overcomes the limitations of traditional display labels, which rely on external power supplies and have limited color representation. By integrating multiple color display units onto a single substrate, rich visual color information can be easily combined through different connection methods, greatly increasing the information capacity and interactive potential per unit area. It can be widely applied to intelligent packaging products requiring dynamic anti-counterfeiting, status indication, or information interaction, thereby enhancing product added value.
[0015] The color display unit uses a mixture of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate and polyaniline-polystyrene sulfonate, which can display green, blue, purple and other contrasting colors under different oxidation-reduction states.
[0016] This invention employs two different common electrodes as the driving source for color changes in the color display unit. The first common electrode has a lower potential than the display unit. Under the condition of ion transport in the transparent transport layer, when the two form a conductive path, the display unit undergoes a reduction reaction, accompanied by a corresponding color change. The second common electrode has a higher potential than the color display unit. When the two form a conductive path, the color display unit undergoes an oxidation reaction, producing a corresponding color change. By connecting each color display unit to the conductive layer beneath the different common electrodes through conductive connectors such as wires, each unit can be actively and reversibly driven to switch between different color states, overcoming the limitations of traditional labels that rely on external power supplies and have the limitation of single-color changes.
[0017] All functional layers of this invention are prepared on a paper substrate by printing process, which does not require complex preparation conditions and equipment. The process is simple, low-cost, and low-energy-consumption. In addition, the substrate is biodegradable, which is in line with the development trend of green manufacturing. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of a passively driven multi-unit multi-color display label; Figure 2 This is a usage example diagram of a passively driven multi-unit multi-color display label; The structure consists of: 1. a base layer, 2. a color display unit, 3. a conductive layer, 4. a first common electrode, 5. a second common electrode, 6. a transparent transmission layer, and 7. a protective layer. Detailed Implementation
[0019] The present invention will be further described in detail below with reference to specific embodiments, but this is not intended to limit the present invention.
[0020] like Figure 1 As shown, the passively driven multi-unit multi-color display tag of this embodiment includes a base layer 1, a plurality of independent color display units 2 printed on the base layer 1, a plurality of independent conductive layers 3 printed on the base layer 1 in the gaps between the color display units 2, each conductive layer 3 being separately arranged from each color display unit 2, a first common electrode 4 and a second common electrode 5 respectively printed on the conductive layer 3, a transparent transmission layer 6 covering the color display units 2, the first common electrode 4 and the second common electrode 5, and a protective layer 7.
[0021] The base layer 1 is made of coated paper or digital proofing paper. The printing ink for the color display unit 2 is an electrochromic material. The first common electrode 4 and the second common electrode 5 have a potential difference with the material of the color display unit 2. The transparent transport layer 6 provides the electrolyte required for the electrochromic reaction of the color display unit 2 and provides the electrolyte for the redox reaction. The protective layer 7 is made of one of polyethylene naphthalate, polyethylene terephthalate, polyethylene, and polypropylene. The potential of the first common electrode 4 is lower than that of the material of the color display unit 2, and the potential of the second common electrode 5 is higher than that of the material of the color display unit 2. By connecting different color display units 2 to the first common electrode 4 or the second common electrode 5 through wires, the color of the color display unit 2 can be driven to change.
[0022] The following is a detailed implementation of the printing and preparation method of the passively driven multi-unit multi-color display label of the present invention: Example 1: A passively driven multi-unit multi-color display label and its printing preparation method are implemented according to the following steps: Step 1: A polymer mixture is prepared by mixing 1.3% (w / w) of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate aqueous dispersion and 1.3% (w / w) of polyaniline-polystyrene sulfonate aqueous dispersion at a mass ratio of 9:1. The polymer mixture is then mixed with diethylene glycol monomethyl ether and 3-pentanol at a mass ratio of 80:3:5 and stirred for 7 h to obtain color display unit ink. The color display unit ink is then gravure printed on substrate 1 using an anilox roller with a screen ruling of 100 l / in and a printing pressure of 400 N. After drying at 80°C for 60 min, multiple independent color display units 2 are formed. Step 2: Add trifluoroacetic acid to the surface of the color display unit 2 described in Step 1, and then allow it to air dry at room temperature for 30 minutes. This completes the final processing. Step 3: Conductive silver paste is screen-printed onto the substrate 1. The printing area does not overlap with the printing area of the color display unit 2. The screen printing plate used has a mesh size of 300, and the squeegee used has a Shore hardness of 80. After drying at 100°C for 60 min, a conductive layer 3 is formed. Step 4: Mix zinc powder and conductive carbon paste at a mass ratio of 11:8 to prepare the first common electrode paste; screen print the first common electrode paste in a predetermined area of the conductive layer 3 using a 200-mesh screen printing plate and a squeegee with a Shore hardness of 70; then dry at 100°C for 2 hours to form the first common electrode 4. Step 5: Mix manganese dioxide powder and conductive carbon paste at a mass ratio of 11:8 to prepare a second electrode paste; screen print the second electrode paste in a predetermined area of the conductive layer 3 using a 300-mesh screen and a squeegee with a Shore hardness of 70; then dry at 100°C for 2 hours to form the second common electrode 5. Step 6: Prepare a gel precursor solution by mixing zinc perchlorate, polyvinyl alcohol, deionized water and dimethyl sulfoxide in a mass ratio of 1:1:4:4 and dissolving them at 80°C; cover the color display unit 2, the first common electrode 4 and the second common electrode 5 with the gel precursor solution to form a transparent transport layer 6. Step 7: Cover the transparent transmission layer 6 with the protective layer 7, and seal the surrounding area with hot melt adhesive to complete the assembly of the passively driven multi-unit multi-color display label; This ultimately results in a passively driven, multi-unit, multi-color display label, with the structure as follows: Figure 1 As shown in the example diagram. Figure 2As shown, the color display unit 2 is initially green. In the first method, the color display unit 2 is connected to the conductive layer 3 below the first common electrode 4 via a wire, which drives the color of the area of the color display unit 2 covered by the transparent transmission layer 6 to change to blue. In the second method, the color display unit 2 is connected to the conductive layer 3 below the second common electrode 5 via a wire, which drives the color of the area of the color display unit 2 covered by the transparent transmission layer 6 to change to purple. This can achieve the effect of dynamic anti-counterfeiting verification and enhance the interactive experience of consumers.
[0023] Figure 2 The specific operation is described as follows: In the first figure, after the color display unit 2 in the lower left corner is connected to the conductive layer 3 below the second common electrode 5, the color display unit 2 undergoes an oxidation reaction and its color changes from green to purple. In the second figure, after the lower left color display unit 2 is connected to the conductive layer 3 below the first common electrode 4, the color display unit 2 undergoes a reduction reaction and its color changes from purple to blue. After the upper right color display unit 2 is connected to the conductive layer 3 below the second common electrode 5, the color display unit 2 undergoes an oxidation reaction and its color changes from green to purple. In the third figure, after the color display unit 2 in the lower right corner is connected to the conductive layer 3 below the first common electrode 4, the color display unit 2 undergoes a reduction reaction and the color changes from green to blue. In the fourth figure, after the color display unit 2 in the upper left corner is connected to the conductive layer 3 below the first common electrode 4, the color display unit 2 undergoes a reduction reaction and its color changes from green to blue. After the color display unit 2 in the lower left corner is connected to the conductive layer 3 below the second common electrode 5, the color display unit 2 undergoes an oxidation reaction and its color changes from blue to purple. In the fifth figure, after the color display unit 2 in the upper left and lower right corners is connected to the conductive layer 3 below the second common electrode 5, the color display unit 2 undergoes an oxidation reaction and its color changes from blue to purple. After the color display unit 2 in the upper right and lower left corners is connected to the conductive layer 3 below the second common electrode 5, the color display unit 2 undergoes a reduction reaction and its color changes from purple to blue.
[0024] Example 2: A passively driven multi-unit multi-color display label and its printing preparation method are implemented according to the following steps: Step 1: A polymer mixture is prepared by mixing 1.3% (w / w) of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate aqueous dispersion and 1.3% (w / w) of polyaniline-polystyrene sulfonate aqueous dispersion at a mass ratio of 6:4. The polymer mixture is then mixed with diethylene glycol monomethyl ether and 3-pentanol at a mass ratio of 90:8:15 and stirred for 7 h to obtain color display unit ink. The color display unit ink is then gravure printed on substrate 1 using an anilox roller with a screen ruling of 150 l / in and a printing pressure of 600 N. After drying at 100°C for 50 min, multiple independent color display units 2 are formed. Step 2: Add trifluoroacetic acid to the surface of the color display unit 2 described in Step 1, and then allow it to air dry at room temperature for 40 minutes. This completes the final processing. Step 3: Conductive silver paste is screen-printed onto the substrate layer 1. The printing area does not overlap with the printing area of the color display unit 2. The screen printing plate used has a mesh size of 200, and the squeegee used has a Shore hardness of 90. After drying at 110°C for 50 min, a conductive layer 3 is formed. Step 4: Mix zinc powder and conductive carbon paste at a mass ratio of 11:8 to prepare the first common electrode paste; screen print the first common electrode paste in a predetermined area of the conductive layer 3 using a screen printing plate with a mesh count of 400 and a squeegee with a Shore hardness of 80; then dry at 110°C for 2 h to form the first common electrode 4. Step 5: Mix manganese dioxide powder and conductive carbon paste at a mass ratio of 11:8 to prepare a second electrode paste; screen print the second electrode paste in a predetermined area of the conductive layer 3 using a screen printing plate with a mesh size of 400 and a squeegee with a Shore hardness of 80; then dry at 110°C for 2 h to form the second common electrode 5. Step 6: Prepare a gel precursor solution by mixing zinc perchlorate, polyvinyl alcohol, deionized water and dimethyl sulfoxide in a mass ratio of 2:1:4:4 and dissolving them at 85°C; cover the color display unit 2, the first common electrode 4 and the second common electrode 5 with the gel precursor solution to form a transparent transport layer 6. Step 7: Cover the transparent transmission layer 6 with the protective layer 7, and seal the edges with hot melt adhesive to complete the assembly of the passive-driven multi-unit multi-color display tag, ultimately forming a passive-driven multi-unit multi-color display tag, with the structure as follows. Figure 1 As shown.
[0025] Example 3: A passively driven multi-unit multi-color display label and its printing preparation method are implemented according to the following steps: Step 1: A polymer mixture is prepared by mixing 1.3% (w / w) of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate aqueous dispersion and 1.3% (w / w) of polyaniline-polystyrene sulfonate aqueous dispersion at a mass ratio of 3:7. The polymer mixture is then mixed with diethylene glycol monomethyl ether and 3-pentanol at a mass ratio of 85:4:7 and stirred for 7 h to obtain color display unit ink. The color display unit ink is then gravure printed on substrate 1 using an anilox roller with a screen ruling of 200 l / in and a printing pressure of 700 N. After drying at 110°C for 30 min, multiple independent color display units 2 are formed. Step 2: Add trifluoroacetic acid to the surface of the color display unit 2 described in Step 1, and then allow it to air dry at room temperature for 60 minutes. This completes the final processing. Step 3: Conductive silver paste is screen-printed onto the substrate 1. The printing area does not overlap with the printing area of the color display unit 2. The screen printing plate used has a mesh size of 400, and the squeegee used has a Shore hardness of 70. After drying at 120°C for 30 min, a conductive layer 3 is formed. Step 4: Mix zinc powder and conductive carbon paste at a mass ratio of 5:15 to prepare the first common electrode paste; screen print the first common electrode paste in a predetermined area of the conductive layer 3 using a 300-mesh screen printing plate and a squeegee with a Shore hardness of 80; then dry at 120°C for 1 h to form the first common electrode 4. Step 5: Mix manganese dioxide powder and conductive carbon paste at a mass ratio of 5:15 to prepare a second electrode paste; screen print the second electrode paste in a predetermined area of the conductive layer 3 using a 300-mesh screen printing plate and a squeegee with a Shore hardness of 80; then dry at 120°C for 1 h to form the second common electrode 5. Step 6: Prepare a gel precursor solution by mixing zinc perchlorate, polyvinyl alcohol, deionized water and dimethyl sulfoxide in a mass ratio of 3:1:4:4 and dissolving them at 90°C; cover the color display unit 2 and the first common electrode 4 and the second common electrode 5 with the gel precursor solution to form a transparent transport layer 6. Step 7: Cover the transparent transmission layer 6 with the protective layer 7, and seal the edges with hot melt adhesive to complete the assembly of the passive-driven multi-unit multi-color display tag, ultimately forming a passive-driven multi-unit multi-color display tag, with the structure as follows. Figure 1 As shown.
[0026] Example 4: A passively driven multi-unit multi-color display label and its printing preparation method are implemented according to the following steps: Step 1: A polymer mixture is prepared by mixing 1.3% (w / w) of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate aqueous dispersion and 1.3% (w / w) of polyaniline-polystyrene sulfonate aqueous dispersion at a mass ratio of 6:4. The polymer mixture is then mixed with diethylene glycol monomethyl ether and 3-pentanol at a mass ratio of 87:5:10 and stirred for 7 h to obtain color display unit ink. The color display unit ink is then gravure printed on substrate 1 using an anilox roller with a screen ruling of 200 l / in and a printing pressure of 700 N. After drying at 110°C for 30 min, multiple independent color display units 2 are formed. Step 2: Add trifluoroacetic acid to the surface of the color display unit 2 described in Step 1, and then allow it to air dry at room temperature for 60 minutes. This completes the final processing. Step 3: Conductive silver paste is screen-printed onto the substrate 1. The printing area does not overlap with the printing area of the color display unit 2. The screen printing plate used has a mesh size of 400, and the squeegee used has a Shore hardness of 70. After drying at 120°C for 30 min, a conductive layer 3 is formed. Step 4: Mix zinc powder and conductive carbon paste at a mass ratio of 12:11 to prepare the first common electrode paste; screen print the first common electrode paste in a predetermined area of the conductive layer 3 using a 300-mesh screen printing plate and a squeegee with a Shore hardness of 80; then dry at 120°C for 1 h to form the first common electrode 4. Step 5: Mix manganese dioxide powder and conductive carbon paste at a mass ratio of 12:11 to prepare a second electrode paste; screen print the second electrode paste in a predetermined area of the conductive layer 3 using a 300-mesh screen printing plate and a squeegee with a Shore hardness of 80; then dry at 120°C for 1 h to form the second common electrode 5. Step 6: Prepare a gel precursor solution by mixing zinc perchlorate, polyvinyl alcohol, deionized water and dimethyl sulfoxide in a mass ratio of 3:1:4:4 and dissolving them at 90°C; cover the color display unit 2 and the first common electrode 4 and the second common electrode 5 with the gel precursor solution to form a transparent transport layer 6. Step 7: Cover the transparent transmission layer 6 with the protective layer 7, and seal the edges with hot melt adhesive to complete the assembly of the passive-driven multi-unit multi-color display tag, ultimately forming a passive-driven multi-unit multi-color display tag, with the structure as follows. Figure 1 As shown.
[0027] The content of this invention is not limited to the embodiments listed. Any equivalent modifications made by those skilled in the art to the technical solutions of this invention by reading this specification are covered by the claims of this invention.
Claims
1. A passively driven multi-unit multi-color display label, characterized in that: Includes a substrate layer (1), multiple independent color display units (2) printed on the substrate layer (1), multiple independent conductive layers (3) printed on the substrate layer (1) located in the gaps between each color display unit (2), each conductive layer (3) is arranged separately from each color display unit (2), a first common electrode (4) and a second common electrode (5) printed on different conductive layers (3), and a transparent transmission layer (6) and a protective layer (7) sequentially covered from bottom to top on the color display unit (2), the first common electrode (4) and the second common electrode (5); The ink printed on the color display unit (2) is an electrochromic material. The first common electrode (4) and the second common electrode (5) have a potential difference with the material of the color display unit (2). The transparent transport layer (6) is used to provide the electrolyte required for the electrochromic reaction of the color display unit (2). The potential of the first common electrode (4) is lower than the potential of the material of the color display unit (2), and the potential of the second common electrode (5) is higher than the potential of the material of the color display unit (2). By connecting different color display units (2) to the first common electrode 4 or the second common electrode 5 through wires, the color of the color display unit (2) can be driven to change.
2. The passively driven multi-unit multi-color display label according to claim 1, characterized in that: The printing ink preparation method of the color display unit (2) is as follows: a polymer mixture is prepared by mixing a 1.3% mass fraction of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate aqueous dispersion and a 1.3% mass fraction of polyaniline-polystyrene sulfonate aqueous dispersion at a mass ratio of (3~9):(1~7). The polymer mixture is then mixed with diethylene glycol monomethyl ether and 3-pentanol at a mass ratio of (80~90):(3~8):(5~15) and stirred.
3. The passively driven multi-unit multi-color display label according to claim 2, characterized in that: The first common electrode (4) is printed using a mixture of zinc powder and conductive carbon paste with a mass ratio of (5~12):(8~15).
4. A passively driven multi-unit multi-color display label according to claim 2, characterized in that: The second common electrode (5) is printed using a mixture of manganese dioxide powder and conductive carbon paste with a mass ratio of (5~12):(8~15).
5. A passively driven multi-unit multi-color display label according to claim 1, characterized in that: The transparent transmission layer (6) is formed by coating the color display unit (2), the first common electrode (4), and the second common electrode (5) with a gel precursor solution prepared by zinc perchlorate, polyvinyl alcohol, deionized water and dimethyl sulfoxide in a mass ratio of (1~3):1:4:
4.
6. A passively driven multi-unit multi-color display label according to claim 1, characterized in that: The protective layer (7) is made of one of polyethylene naphthalate, polyethylene terephthalate, polyethylene and polypropylene.
7. A passively driven multi-unit multi-color display label according to claim 1, characterized in that: The base layer (1) is one of coated paper and digital proofing paper.
8. A method for printing and preparing a passively driven multi-unit multi-color display label as described in claim 1, characterized in that... Includes the following steps: Step 1: Gravure printing of color display unit printing ink onto the substrate layer (1), and drying at 80~110℃ for 30~60min to form multiple independent color display units (2). Step 2: Add trifluoroacetic acid to the surface of the color display unit (2) described in Step 1, and then allow it to dry naturally at room temperature for 30-60 minutes. After completion, perform the final treatment. Step 3: The conductive silver paste is screen-printed on the substrate layer (1), and the printing area does not overlap with the printing area of the color display unit (2). After drying at 100~120℃ for 30~60 min, a conductive layer (3) is formed. Step 4: First common electrode paste is screen-printed in a predetermined area of the conductive layer (3), and dried at 100~120℃ for 1~2 h to form a first common electrode (4); Second common electrode paste is screen-printed in a predetermined area of the conductive layer (3), and dried at 100~120℃ for 1~2 h to form a second common electrode (5). Step 5: Cover the color display unit (2) and the first common electrode (4) and the second common electrode (5) with the transparent transmission layer (6) material to form the transparent transmission layer (6). Step 6: Cover the transparent transmission layer (6) with the protective layer (7) material and seal the surrounding area with hot melt adhesive to obtain the passively driven multi-unit multi-color display label.
9. A passively driven multi-unit multi-color display label according to claim 8, characterized in that: In step 1, the gravure printing uses an anilox roller with a screen ruling of 100-200 l / in and a printing pressure of 400-700 N.
10. A passively driven multi-unit multi-color display label according to claim 8, characterized in that: In steps 3 and 4, the screen printing plates used for screen printing have a mesh size of 200 to 400, and the squeegee used has a Shore hardness of 70 to 90.