Flexible color gradient module and preparation process thereof

Abstract

The invention discloses a flexible color gradient module and a preparation process thereof, and relates to the technical field of flexible light guide, the flexible color gradient module comprises a flexible printed circuit board, the flexible printed circuit board is bonded with a light transmitting film through liquid silica gel resin, and the liquid silica gel resin is used as a light guide plate to guide light emitted by a light source. The liquid silica gel resin has good light guide performance and flexibility, the liquid silica gel resin is used as a bonding material, the dual effects of light guide and bonding are achieved, the stability of the whole module in a high-temperature or high-intensity light environment is improved, meanwhile, the arrangement of the light guide layer is reduced, the integration degree of the whole module is higher, and the light guide layer is more compact. The light source is arranged on the side, close to the liquid silica gel resin, of the flexible printed circuit board, light rays emitted by the light source are guided through the liquid silica gel resin, and therefore the light rays penetrating through the light-transmitting film have the dynamic change effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flexible light guide, in particular to a flexible color gradient module and a preparation process thereof. BACKGROUND

[0002] Traditional light guide materials cannot adapt to complex shapes and dynamic changes; and usually a large number of LEDs are needed to achieve complex color effects, resulting in high energy consumption and high cost, and moreover, the traditional light guide system has poor stability under high temperature or high intensity light environment, and cannot achieve efficient dynamic changing effect. The prior art discloses a "flexible light guide film" (CN212379603U), which specifically discloses: a flexible reflection layer, a flexible light guide layer arranged on one side of the flexible reflection layer, a flexible light shielding layer arranged on the other side of the flexible light guide layer, a glue layer arranged on the other side of the flexible light shielding layer, and an FPC circuit board and an LED light source arranged on one side of the flexible reflection layer, the flexible light guide layer and the flexible light shielding layer; the FPC circuit board is electrically connected with the LED light source; an optical ink layer is arranged between the flexible light guide layer and the light shielding layer. The prior art also discloses a "light guide film capable of changing light output color" (CN212379604), which specifically discloses: a TP glass, a light shielding layer, a light filtering layer, a glue layer, a light guide layer, a reflection layer and an FPC lamp plate arranged in turn from top to bottom; the surface of the light guide layer is provided with a light guide microstructure for causing light to be diffusely reflected; a light source is arranged on one side of the light filtering layer, the glue layer, the light guide layer and the reflection layer; the upper and lower ends of the light source are connected to the light shielding layer and the FPC lamp plate, respectively. In the above prior art, although the light guide layer and the reflection layer are used, the reflection and light guide of light are realized under the condition of ensuring flexibility, but the light guide layer and the reflection layer need to be attached by means of glue between the light guide layer and the reflection layer and between the light guide layer and the light shielding layer or the light filtering layer. Due to the difference in reflection performance and light guide performance between the glue and the light guide layer and the reflection layer, the reflection and light guide of light will be inevitably affected, the reflection and light guide effect of light will be affected, and finally the visual effect will be affected. SUMMARY

[0003] The present application aims to provide a flexible color gradient module and a preparation process thereof, to solve the problem of how to improve the light reflection or light guide performance of the module in the prior art.

[0004] To achieve the above object, the present application provides the following technical solution: A flexible color gradient module, comprising a flexible printed circuit board provided with a power supply and a control circuit, the flexible printed circuit board is bonded with a light transmission film through liquid silicone resin, and the flexible printed circuit board is provided with a light source near the side of the liquid silicone resin; the liquid silicone resin is used to bond the flexible printed circuit board and the light transmission film, which realizes the functions of light guiding and bonding at the same time, and the liquid silicone resin has flexibility and stability, thereby improving the stability of the entire module in high-temperature or high-intensity light environment.

[0005] According to the above technical solution, the liquid silicone resin serves as a light guide plate to process the light emitted by the light source, thereby reducing the setting of the light guide layer and making the entire module more portable and simple.

[0006] According to the above technical solution, the light source is a three-color light-emitting diode installed on the flexible printed circuit board and electrically connected with the power supply and the control circuit; the three-color light-emitting diode adjusts the brightness of red, green and blue colors, cooperates with the light transmission film composed of different color inks, and further enhances the smoothness and softness of color transition, so that a variety of color combinations and dynamic visual effects can be realized.

[0007] According to the above technical solution, the light transmission film is composed of several colors of inks and is used to selectively transmit light of specific wavelengths, which can realize different color effect changes in cooperation with the three-color light-emitting diode, and can reduce the demand for the number of light sources, thereby effectively reducing energy consumption and cost.

[0008] According to the above technical solution, the light transmission film is bonded with leather away from the liquid silicone resin, and holes are formed in the leather, so that light with different color effect changes can pass through the leather holes to achieve a colorful effect.

[0009] A preparation process of a flexible color gradient module, comprising the following steps, Step 1, preparation: preparing an injection molding mold and liquid silicone resin, and setting parameters of an injection molding machine; Step 2, injection treatment: starting the injection molding machine, injecting the prepared liquid silicone resin into the injection molding mold at a set injection flow rate, and maintaining the injection pressure; Step 3, pressure holding and curing: after the liquid silicone resin fills the cavity of the injection molding mold, pressure holding treatment is performed, and the heating system of the injection molding mold is used to maintain the molding temperature within the curing temperature range of the liquid silicone resin; Step 4, demolding treatment: after the liquid silicone resin is completely cured, the injection molding mold is opened, and the molded product is demolded by a demolding device.

[0010] According to the above technical scheme, the injection molding mold is designed and manufactured according to the product shape and size of the light transmission film and the flexible printed circuit board, the surface of the injection molding mold cavity is smooth, the roughness reaches the corresponding standard, and the surface quality of the molded product is guaranteed; the injection molding mold is comprehensively checked, including the installation accuracy of each part, the smoothness of the cooling waterway and the heating system, etc., to prepare for injection, the light transmission film is placed in the cavity of the injection molding mold, and the light transmission film is positioned by the positioning device, and the light transmission film must ensure its color stability and compatibility with the liquid silicone resin. If the liquid silicone resin has at least two components, the liquid silicone resin is mixed and stirred uniformly according to the requirements. The parameters of the injection molding machine are set, including but not limited to injection flow rate and molding temperature.

[0011] According to the above technical scheme, the liquid silicone resin is injected into the injection molding mold at an injection flow rate of 5-50 cm 3 / s, too slow flow rate may cause the liquid silicone resin to start curing before completely filling the cavity of the injection molding mold, affecting the product molding integrity; too fast flow rate may cause turbulent flow, air entrainment and bubble formation, affecting product quality. During the injection molding process, the injection pressure is continuously monitored and maintained at 100-1000 bar to ensure that the liquid silicone resin can quickly and uniformly fill the cavity of the injection molding mold, while avoiding damage to the injection molding mold or defects such as flash due to excessive pressure. The holding pressure needs to be adjusted according to the complexity of the injection molding mold cavity, the size of the product and the flowability of the liquid silicone resin, etc. to ensure that the liquid silicone resin can smoothly fill every corner of the injection molding mold and form a complete and qualified product.

[0012] According to the above technical scheme, during the holding process, the holding pressure and time are adjusted according to the product thickness and quality requirements, the holding pressure is generally slightly lower than the injection pressure, and the holding time is 5-10 s. During the holding process, the heating system is used to maintain the curing temperature of the liquid silicone resin at 50-70℃, which promotes the full curing of the liquid silicone resin and realizes the firm combination with the light transmission film, while ensuring that the properties of the light transmission film are not affected, such as color change, film structure damage, etc. This temperature range can ensure that the liquid silicone resin does not cure too early during the flow process, and can ensure good curing effect after filling the cavity through the holding stage. The curing time is 30-120 s, which depends on the product thickness and molding temperature, etc. Suitable holding can compensate for the volume shrinkage of the liquid silicone resin during the curing process, ensuring the dimensional accuracy and internal structure density of the product.

[0013] According to the above technical scheme, after the demolding treatment, the molded product is subjected to secondary treatment, including but not limited to removing burrs, overflow and the like that may exist, and the entire in-mold low-temperature injection molding process is completed.

[0014] Compared with the prior art, the present application has the following advantages: 1. The liquid silicone resin has good light guiding performance and flexibility. Using the liquid silicone resin as the bonding material, the dual functions of light guiding and bonding are achieved, the stability of the entire module in a high-temperature or high-intensity light environment is improved, and at the same time, the setting of the light guiding layer is reduced, so that the integration degree of the entire module is higher and more simple.

[0015] 2. The three-color light emitting diode can realize the combination of multiple colors and the dynamic change of the visual effect by adjusting the brightness of red, green and blue. Especially under the control of the control circuit program, the color gradient function with time dimension is realized, providing richer visual expression and dynamic light effect scene, further improving the user experience and product aesthetics. In combination with the selective transmission of the light transmission film, different color effect changes can be realized, and at the same time, the demand for the number of light sources can be reduced, effectively reducing energy consumption and cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A schematic diagram of the hierarchical structure of the flexible color gradient module.

[0017] Reference signs: 1, flexible printed circuit board; 2, three-color light emitting diode; 3, liquid silicone resin; 4, light transmission film; 5, leather; 6, hole. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0019] Embodiment 1: as Figure 1As shown, the present application provides a flexible color gradient module, the flexible color gradient module comprises a flexible printed circuit board 1, the flexible printed circuit board 1 is bonded with a light transmission film 4 through liquid silicone resin 3, the liquid silicone resin 3 is used as a light guide plate to guide the light emitted by the light source, ensuring uniform distribution of light, the liquid silicone resin 3 has good light guiding performance and flexibility, using the liquid silicone resin 3 as an adhesive material plays a dual role of light guiding and bonding, improving the stability of the entire module in high temperature or high intensity light environment, at the same time, reducing the setting of the light guide layer makes the entire module more integrated and more simple, the light source is arranged on the side of the flexible printed circuit board 1 close to the liquid silicone resin 3, the light emitted by the light source is guided by the liquid silicone resin 3, the light transmission film 4 is bonded with a leather 5 on the side away from the liquid silicone resin 3, and the leather 5 is provided with a hole 6, so that the color with dynamic change effect passing through the light transmission film 4 can be displayed through the hole 6 of the leather 5.

[0020] In this embodiment, as preferred, the light source is a three-color light-emitting diode 2 mounted on the flexible printed circuit board 1 and electrically connected to the power supply and control circuit on the flexible printed circuit board 1 by welding or other means, the flexible printed circuit board 1 provides flexible electrical connection, so that the light source array can be arranged flexibly and is convenient to install and maintain, the three-color light-emitting diode 2 can realize the combination of multiple colors and the dynamic change of visual effect by adjusting the brightness of red, green and blue, and the control mode adopts PWM or other dimming protocol, and the time program can realize continuous color gradient such as red→orange→yellow; In addition, the area of the light transmission film 4 is designed by gradient printing of different color inks, which enhances the overall gradient visual experience after superimposing with the dynamic light source output.

[0021] In this embodiment, as preferred, the light transmission film 4 is composed of several colors of ink for selectively transmitting light of a specific wavelength, which can realize different color effect changes in cooperation with the three-color light-emitting diode 2, and at the same time, can reduce the demand for the number of light sources, effectively reducing energy consumption and cost.

[0022] Embodiment 2: A preparation process of a flexible color gradient module, comprising the following steps, Step 1, preparation: preparing the injection molding mold and the liquid silicone resin 3, and setting the parameters of the injection molding machine; Specifically, the injection molding mold is designed and manufactured according to the product shape and size of the light-transmitting film 4 and the flexible printed circuit board 1, the surface of the injection molding mold cavity is smooth, and the roughness reaches the corresponding standard, so as to ensure the surface quality of the molded product; the injection molding mold is comprehensively checked, including the installation accuracy of each part, the smoothness of the cooling waterway and the heating system, etc., to prepare for injection, the light-transmitting film 4 is placed in the cavity of the injection molding mold, and the light-transmitting film 4 is positioned by the positioning device, and the light-transmitting film 4 ensures the color stability and the compatibility with the liquid silicone resin 3; at the same time, the flexible printed circuit board 1 is also placed in the injection molding mold, and is bonded with the liquid silicone resin and the light-transmitting film by embedding and injecting, to form the flexible color gradient module.

[0023] If the liquid silicone resin 3 has at least two components, the liquid silicone resin 3 is mixed and stirred according to the requirements; In this embodiment, the liquid silicone resin 3 has two components, including component A (main agent) and component B (curing agent), and the component A and the component B are mixed at a ratio of 1:1, wherein the main component of the component A is a basic silicone resin (containing a siloxane main chain), and reinforcing fillers (such as white carbon black), pigments, plasticizers, etc. can be added, which is the core part of determining the performance (such as hardness, elasticity, temperature resistance) of the final product, and the main component of the component B is an initiator or crosslinking agent (such as hydrogen-containing silicone oil, organic tin catalyst, etc.) for curing reaction, which itself does not have film-forming or molding ability, but can react with active groups (such as hydroxyl, vinyl) in the component A to promote the system to change from liquid to solid.

[0024] The parameters of the injection molding machine are set, including but not limited to injection flow rate and molding temperature.

[0025] Step 2, injection molding treatment: start the injection molding machine, inject the mixed liquid silicone resin 3 into the injection molding mold at a set injection flow rate, and keep the injection pressure; Specifically, the liquid silicone resin 3 is injected at a flow rate of 40 cm 3The injection molding flow rate of / s is injected into the injection molding mold, and the injection molding flow rate will have certain differences according to different materials. If the flow rate is too slow, the liquid silicone resin 3 may start to solidify before completely filling the cavity of the injection molding mold, affecting the integrity of the product molding. If the flow rate is too fast, it may cause turbulent flow, air entrainment and bubble formation, affecting product quality. During the injection molding process, the injection molding pressure is continuously monitored and maintained at 140 bar. According to different materials, the injection molding pressure will have certain differences. Ensure that the liquid silicone resin 3 can quickly and uniformly fill the cavity of the injection molding mold, while avoiding damage to the injection molding mold or defects such as flash due to excessive pressure. The holding pressure needs to be adjusted according to the complexity of the injection molding mold cavity, product size, and fluidity of the liquid silicone resin 3, etc. to ensure that the liquid silicone resin 3 can smoothly fill every corner of the injection molding mold and form a complete and qualified product.

[0026] Step 3, pressure holding and curing: After the liquid silicone resin 3 fills the injection molding mold cavity, pressure holding is performed, and the heating system of the injection molding mold is used to maintain the molding temperature within the curing temperature range of the liquid silicone resin 3. Specifically, during the pressure holding process, the pressure holding pressure and time are adjusted according to the product thickness and quality requirements. Generally, the pressure holding pressure is slightly lower than the injection pressure. In this embodiment, the product thickness is 0.5 mm, and the pressure holding time is 5 s. During the pressure holding process, the heating system is used to maintain the curing temperature of the liquid silicone resin 3 at 65°C. This temperature range can ensure that the liquid silicone resin 3 does not solidify prematurely during the flow process, and can ensure good curing effect after filling the cavity through the pressure holding stage. The curing time is 30 s, which depends on product thickness and molding temperature, etc. It should be noted that the curing time is different for different materials and product sizes. Curing temperature and time are related. The longer the curing time, the lower the curing temperature. The shorter the curing time, the higher the curing temperature. Suitable pressure holding can compensate for the volume shrinkage of the liquid silicone resin 3 during the curing process, ensuring product size accuracy and internal structure density.

[0027] Step 4, demolding treatment: After the liquid silicone resin 3 is completely cured, the injection molding mold is opened, and the molded product is demolded by the demolding device.

[0028] Specifically, after demolding, the molded product is subjected to secondary processing, including but not limited to removing possible flash, overflow, etc., completing the entire in-mold low-temperature injection molding process.

[0029] Example 3: In the present embodiment, Step 1, Step 2 and Step 4 are exactly the same as Embodiment 2; Step 3, pressure holding and curing: after the liquid silicone resin 3 fills the cavity of the injection molding mold, pressure holding is performed, and the molding temperature is maintained within the curing temperature range of the liquid silicone resin 3 by using the heating system of the injection molding mold; Specifically, during the pressure holding, the pressure and time are adjusted according to the product thickness and quality requirements. Generally, the pressure holding pressure is slightly lower than the injection pressure. In the present embodiment, the product thickness is 5 mm, and the pressure holding time is 10 s. During the pressure holding, the curing temperature of the liquid silicone resin 3 is maintained at 65°C by using the heating system, so as to promote the full curing of the liquid silicone resin 3 and realize the firm combination with the light-transmitting film 4, while ensuring that the characteristics of the light-transmitting film 4 are not affected, such as color change, film structure damage, etc. This temperature range can ensure that the liquid silicone resin 3 does not cure too early during the flowing process, and can also ensure good curing effect after filling the cavity through the pressure holding stage. The curing time is 120 s, which depends on the product thickness and molding temperature and other factors; Suitable pressure holding can compensate for the volume shrinkage of the liquid silicone resin 3 during the curing process, and ensure the dimensional accuracy and internal structure density of the product.

[0030] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the present application should be defined by the appended claims rather than the above description, and it is intended to include all changes falling within the meaning and scope of equivalents of the claims. Any reference signs in the claims should not be considered as limiting the claims involved.

Claims

1. A flexible color gradient module, comprising a flexible printed circuit board with power supply and control circuitry, wherein the flexible printed circuit board is provided with tri-color light-emitting diodes, characterized in that: The flexible printed circuit board is bonded with a light-transmitting film by liquid silicone resin, and the tri-color light-emitting diode is located on the side of the flexible printed circuit board closer to the liquid silicone resin.

2. The flexible color gradient module according to claim 1, characterized in that: The liquid silicone resin acts as a light guide plate to guide the light emitted from the light source.

3. The flexible color gradient module according to claim 1, characterized in that: The tri-color LED is electrically connected to the power supply and control circuit, and the control circuit controls the tri-color LED to adjust its color and brightness.

4. A flexible color gradient module according to claim 1, characterized in that: The light-transmitting film is composed of inks of several colors.

5. A flexible color gradient module according to any one of claims 1-4, characterized in that: The translucent film is bonded to leather on the side away from the liquid silicone resin, and the leather has holes.

6. The manufacturing process of a flexible color gradient module according to any one of claims 1-5, characterized in that: Includes the following steps, Step 1, Preparation: Prepare the injection molding mold and liquid silicone resin, and set the injection molding machine parameters; Step 2, Injection Molding: Start the injection molding machine and inject the prepared liquid silicone resin into the injection mold at the set injection flow rate, maintaining the injection pressure; Step 3, Pressure Holding and Curing: After the liquid silicone resin fills the injection molding mold cavity, pressure holding is performed, and the molding temperature is maintained within the curing temperature range of the liquid silicone resin using the heating system of the injection molding mold. Step 4, Demolding: After the liquid silicone resin has completely cured, open the injection molding mold and demold the molded product using a demolding device.

7. The manufacturing process of a flexible color gradient module according to claim 6, characterized in that: Based on the product shape and size of the light-transmitting film and flexible printed circuit board, an injection molding mold is designed and manufactured. The light-transmitting film is placed inside the cavity of the injection molding mold, and the light-transmitting film is positioned by a positioning device. Prepare the liquid silicone resin according to the requirements and stir it evenly; Set various parameters for the injection molding machine, including but not limited to injection flow rate and molding temperature.

8. The manufacturing process of a flexible color gradient module according to claim 6, characterized in that: Liquid silicone resin was poured at a depth of 5-50 cm. 3 The injection flow rate is injected into the injection mold at a rate of / s. During the injection process, the injection pressure is continuously monitored and maintained at 100-1000 bar.

9. The manufacturing process of a flexible color gradient module according to claim 6, characterized in that: During the pressure holding process, the holding time is 5-10 seconds. During the pressure holding process, the curing temperature of the liquid silicone resin is maintained at 50-70℃ using a heating system, and the curing time is 30-120 seconds.

10. The manufacturing process of a flexible color gradient module according to claim 6, characterized in that: After demolding, the molded product undergoes secondary processing to complete the entire in-mold low-temperature injection molding process.

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