Heating and demisting module for touch screen

Abstract

The utility model relates to the technical field of touch screens, and discloses a touch screen heating defogging module which comprises a lower iron frame, a rubber frame arranged at the top of the lower iron frame, a backlight assembly arranged at the top of the rubber frame, a lower polaroid arranged at the top of the backlight assembly, a liquid crystal display screen arranged at the top of the lower polaroid, and a liquid crystal display screen arranged at the top of the liquid crystal display screen. An upper polaroid is arranged at the top of the liquid crystal display screen, an upper iron frame is arranged at the top of the upper polaroid, ITO heating resistance glass is arranged at the top of the upper iron frame, and a glass cover plate is arranged at the top of the ITO heating resistance glass; wherein a driving IC is arranged at one end of the top of the liquid crystal display screen. The heating demisting module for the touch screen can be rapidly heated to 55-75 DEG C within 20-50 seconds, and the surface of a product is uniformly heated, so that a thin ice layer on the surface of the product or rapid diffusion of water mist can be effectively removed, and the problems that a display screen cannot be clearly seen and the touch screen is automatically touched due to water are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of touch screens, and more specifically, to a touch screen heating and defogging module. Background Art

[0002] With the continuous improvement of people's living standards, consumers' demand for imported cold chain products is increasing day by day. Especially in special fields such as fresh food and pharmaceuticals that require low-temperature transportation and storage, the demand for cold chain logistics is particularly urgent. However, with the increase in the transportation and use frequency of these products, in some special fields and climatic conditions, the use of cold chain equipment also faces some new challenges. Especially in some extremely cold regions or environments that require long-term low-temperature preservation, thin ice layers or water mist often appear on the surface of display modules of electronic devices such as touch screens due to the influence of external temperature differences or high humidity. This situation will cause the screen display to be unclear, making it difficult for users to accurately read or operate the device, thus affecting the normal work process and efficiency. Such problems are particularly prominent in scenarios that require accurate data such as cold storage management and cold chain transportation monitoring. There is an urgent need for improvement and innovation in related technologies to improve the adaptability and stability of equipment in low-temperature environments and ensure the safety of products and the convenient experience of users.

[0003] Regarding the problems in the related art, no effective solution has been proposed yet. Summary of the Invention

[0004] Regarding the problems in the related art, the utility model proposes a touch screen heating and defogging module to overcome the above-mentioned technical problems existing in the existing related art.

[0005] Therefore, the specific technical solution adopted by the utility model is as follows:

[0006] A touch screen heating and defogging module includes a lower iron frame. A rubber frame is arranged on the top of the lower iron frame. A backlight assembly is arranged on the top of the rubber frame. A lower polarizer is arranged on the top of the backlight assembly. A liquid crystal display screen is arranged on the top of the lower polarizer. An upper polarizer is arranged on the top of the liquid crystal display screen. An upper iron frame is arranged on the top of the upper polarizer. An ITO heating resistance glass is arranged on the top of the upper iron frame. A glass cover plate is arranged on the top of the ITO heating resistance glass. Among them, a driving IC is arranged at one end of the top of the liquid crystal display screen. Flexible circuit boards are arranged on one side of the driving IC and one side of the top of the ITO heating resistance glass.

[0007] Further, the backlight assembly includes a backlight FPC disposed at one end of the top of the rubber frame, and a plurality of LEDs are evenly disposed on the top of the backlight FPC. The backlight assembly further includes a reflective film disposed on the top of the rubber frame, a light guide plate disposed on the top of the reflective film, a diffusion film disposed on the top of the light guide plate, a brightness enhancement film group disposed on the top of the diffusion film, and a light-shielding adhesive disposed on the top of the brightness enhancement film group. The brightness enhancement film group includes a lower brightness enhancement film disposed on the top of the diffusion film, an upper brightness enhancement film disposed on the top of the lower brightness enhancement film, and the top of the upper brightness enhancement film is connected to the bottom of the light-shielding adhesive.

[0008] Further, between the driving IC and the liquid crystal display screen, and between the flexible circuit board and the ITO heating resistance glass and the liquid crystal display screen, they are all connected through anisotropic conductive films. The ITO heating resistance is etched on the ITO heating resistance glass, and the ITO heating resistance is led out as positive and negative electrodes to the flexible circuit board through the screen-printed silver paste lines on both sides of the ITO heating resistance glass and is connected thereto.

[0009] The beneficial effects of the present utility model are as follows: The touch screen heating and defogging module of the present utility model can rapidly heat up to 55°C - 75°C within 20s to 50s, and the surface of the product is heated evenly, so that the thin ice layer or water mist on the surface of the product can be effectively removed and rapidly diffused, thereby effectively solving the problems that the display screen is not clear and the touch screen is automatically touched due to water. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0011] Figure 1 is a schematic structural diagram of a touch screen heating and defogging module according to an embodiment of the present utility model;

[0012] Figure 2 is an installation schematic diagram of an ITO heating resistance in a touch screen heating and defogging module according to an embodiment of the present utility model.

[0013] In the figure:

[0014] 1, lower iron frame; 2, rubber frame; 3, backlight FPC; 4, LED; 5, reflective film; 6, light guide plate; 7, diffusion film; 8, lower brightness enhancement film; 9, upper brightness enhancement film; 10, light-shielding adhesive; 11, lower polarizer; 12, liquid crystal display screen; 13, upper polarizer; 14, upper iron frame; 15, ITO heating resistance glass; 16, glass cover plate; 17, driving IC; 18, flexible circuit board; 19, anisotropic conductive film; 20, ITO heating resistance. Detailed Implementation Modes

[0015] To further illustrate each embodiment, the present utility model provides attached drawings. These attached drawings are a part of the disclosure of the present utility model, mainly used to illustrate the embodiments, and can cooperate with the relevant descriptions in the specification to explain the operating principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation modes and the advantages of the present utility model. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0016] According to an embodiment of the present utility model, a touch screen heating and defogging module is provided.

[0017] Now, the present utility model will be further described in combination with the attached drawings and specific implementation modes. As Figure 1 - Figure 2 shown, the touch screen heating and defogging module according to an embodiment of the present utility model includes a lower iron frame 1. A glue frame 2 is arranged on the top of the lower iron frame 1. A backlight assembly is arranged on the top of the glue frame 2. A lower polarizer 11 is arranged on the top of the backlight assembly. A liquid crystal display screen 12 is arranged on the top of the lower polarizer 11. An upper polarizer 13 is arranged on the top of the liquid crystal display screen 12. An upper iron frame 14 is arranged on the top of the upper polarizer 13. An ITO heating resistance glass 15 is arranged on the top of the upper iron frame 14. A glass cover plate 16 is arranged on the top of the ITO heating resistance glass 15. Among them, a driving IC 17 is arranged at one end of the top of the liquid crystal display screen 12. Flexible circuit boards 18 are arranged on one side of the driving IC 17 and on one side of the top of the ITO heating resistance glass 15.

[0018] In one embodiment, the backlight assembly includes a backlight FPC 3 arranged at one end of the top of the glue frame 2. A plurality of LEDs 4 are evenly arranged on the top of the backlight FPC 3. The backlight assembly further includes a reflective film 5 arranged on the top of the glue frame 2. A light guide plate 6 is arranged on the top of the reflective film 5. A diffusion film 7 is arranged on the top of the light guide plate 6. An optical enhancement film group is arranged on the top of the diffusion film 7. A light-shielding glue 10 is arranged on the top of the optical enhancement film group. The optical enhancement film group includes a lower optical enhancement film 8 arranged on the top of the diffusion film 7. An upper optical enhancement film 9 is arranged on the top of the lower optical enhancement film 8, and the top of the upper optical enhancement film 9 is connected to the bottom of the light-shielding glue 10.

[0019] In one embodiment, the driving IC 17 and the liquid crystal display screen 12, and the flexible circuit boards 18 and the ITO heating resistance glass 15 and the liquid crystal display screen 12 are all connected through anisotropic conductive films 19. An ITO heating resistance 20 is etched on the ITO heating resistance glass 15, and the ITO heating resistance 20 is led out as positive and negative electrodes to the flexible circuit board 18 through screen-printed silver paste lines located on both sides of the ITO heating resistance glass 15 and connected thereto.

[0020] In this embodiment, the characteristics of the laminated materials of the touch screen heating and defogging module are as follows:

[0021] Glass cover plate: The glass cover plate is the protective glass. As an important component of the touch control device, its main tasks are: protecting the LCD, having good light transmittance, and decorating the appearance of the touch control device. Its main properties are: 1. Excellent surface finish; 2. Extremely high surface hardness and strong scratch resistance; 3. Good surface strength; 4. Precise dimensional control; 5. Having excellent metallic visual effects. 6. High surface hardness, Mohs hardness reaching 7H, scratch-resistant, and good light transmittance.

[0022] ITO heating resistance glass: A transparent ITO heating resistance is formed on glass with different thicknesses. By applying voltage and current, it can be heated, and the heat is transferred to the liquid crystal module resistance, which can cooperate with the A.A area of the liquid crystal module and the V.A area of the silk-screen visible area.

[0023] Upper iron frame: Strengthen the intensity of the backlight, protect the LCD IC, prevent the separation of the backlight and the LCD. For small and medium-sized color screens, the main materials used are SUS304, SUS201, SUS430, tinplate SPTE, galvanized aluminum AL-Zn, etc.

[0024] Upper polarizer: The polarizer makes the natural light without polarization properties become polarized, turning it into polarized light. Coupled with the twisting characteristics of liquid crystal molecules, it can control whether light passes through, thereby improving the light transmittance and viewing angle range, and forming functions such as anti-glare. The polarizer is a sheet-shaped optical material that generates and detects polarized light, and it is also an essential key component of the liquid crystal display screen.

[0025] COG ACF: ACF (Anisotropic Conductive Film, that is, anisotropic conductive film), its characteristic is that the resistance characteristics in the Z-axis electrical conduction direction and the XY insulating plane have obvious differences. When the difference between the Z-axis conduction resistance value and the XY plane insulation resistance value exceeds a certain ratio, it can be called good conductive anisotropy. At the same time, COG ACF can play a role in bonding and fixing the driving IC and the glass.

[0026] Driving IC: The IC is an integrated circuit module that controls the flipping change of liquid crystal molecules.

[0027] FOG ACF: ACF is the anisotropic conductive film. Its characteristic is that the resistance characteristics in the Z-axis electrical conduction direction and the XY insulating plane have obvious differences. When the difference between the Z-axis conduction resistance value and the XY plane insulation resistance value exceeds a certain ratio, it can be called good conductive anisotropy. At the same time, FOG ACF can play a role in bonding and fixing the FPC and the glass.

[0028] LCD FPC: The FPC flexible printed circuit board uses a flexible insulating substrate (commonly PI polyimide), and etches the required circuits on the copper foil. It can be bent, curled, and folded according to the design requirements. Using the surface mount technology SMT, components are assembled on the FPC to form a circuit board with components, which plays the role of power supply and telecommunications.

[0029] In-cell LCD (Liquid Crystal Display): The structure of the LCD is to place a liquid crystal cell between two parallel glass substrates. TFT (Thin Film Transistor) is set on the lower substrate glass, and a color filter is set on the upper substrate glass. By changing the signals and voltages on the TFT, the rotation direction of the liquid crystal molecules is controlled, so as to control whether the polarized light of each pixel point is emitted or not to achieve the display purpose. The Incell LCD screen is a screen lamination technology, which represents the integrated lamination treatment of the touch panel and the LCD liquid crystal panel; that is, the touch panel is embedded in the liquid crystal pixels.

[0030] Lower polarizer: The polarizer makes the non-polarized natural light polarized and transformed into polarized light. Coupled with the twisting characteristics of the liquid crystal molecules, it controls whether the light passes through or not, thereby improving the light transmittance and viewing angle range, and forming functions such as anti-glare. The polarizer is a sheet-shaped optical material that generates and detects polarized light, and is also an essential key component of the liquid crystal display.

[0031] Light-shielding adhesive: Usually divided into black-and-white adhesive and black-and-black adhesive. It uses PET as the tape substrate and acrylic as the adhesive, and is coated with an adhesive with excellent transparency on the surface. The white surface plays a role in reflecting light and fixing the rubber frame, and the light coming out of the light guide plate can also be reflected back for utilization. The black surface plays a role in light shielding and fixing the LCD. The thickness is generally 0.065 - 0.085mm.

[0032] Upper and lower brightness enhancement film (BEF): On a PET polyester film substrate, a prism layer is precisely formed with acrylate. When light has accurate spacing, angle, thickness, and reflectivity, it is recycled and the light source emission angle is reduced, improving the light source utilization rate to achieve the effect of increasing brightness. Two pieces are used orthogonally. The 3M BEF-RP series products are a combination of a polarizing film and T-BEF, enabling light to be recycled through polarization technology within the LCM system, and the brightness enhancement coefficient can reach 1.2 - 1.3. The thickness is generally 0.062 - 0.20m; common models: 3M-THIN-BEF90 / 24, 3M-BEFII, 3M-BEFIII, 3M-BEFRP2, 3M-DBEF-5, 3M-DBEF280, 3M-DBEF380, Kangde Xin KBBP-65 / 100 / 125, Kangde Xin KBBO-65 / 100 / 125, Guangcan GC577, V-S402, GP-62, GP25-67, ETCL-DP100, ETCL-62SH, CH-120F, KS77AK-60, KS27A-70, etc.

[0033] Diffusion film: Light scatters on its surface, and the surface is foggy and semi-transparent. It is mainly used to reduce bright spots, dot patterns, bright lines, unevenness, etc. on the light guide plate. Diffusion films have front and back sides, and the attachment method is with the foggy side up and the bright side down (towards the light guide plate). TFT backlights usually only have a lower diffusion film. The quality of the diffusion film depends on its light transmittance and haze. The higher the values of both, the better the diffusion effect. The thickness is generally 0.04 - 0.15m; common models: 50LSE, TPRA90#, HF75, CH-27, Lucky CDX211, Lucky CDX351, Lucky CDX342TG, B38VH, B100S-2, etc.

[0034] Light guide plate: On a PC substrate plate, dots are designed to be distributed regularly, converting the point light source emitted by the LED into a surface light source. The dot forming methods generally include laser, printing, laser engraving, and bumping. V-CUT is to make straight stripes on the light guide plate, and the uniformity of light emission is controlled by controlling the spacing and height of the stripes. The backlight module designed and manufactured in this way has the highest brightness, but due to factors such as mold processing accuracy and injection molding accuracy, its application is not extensive. Common material models: PMMA, transparent PC, transparent PS material, etc.

[0035] 1) PMMA has good light transmittance but is brittle. The optimal temperature resistance range is -20°C to +70°C. It is commonly used in handmade samples (flat structures with relatively thick materials) and products at room temperature. PMMA is also called acrylic or acryl, which are Chinese translations of the English word "acrylic". Translated, it is actually plexiglass, and its chemical name is Polymethyl Methacrylate;

[0036] 2) Transparent PC material has high strength and good bendability. It can withstand high and low temperatures from -40°C to +100°C. It is generally applicable to products with more complex structures, retaining walls, and wide temperature ranges. The general specifications of transparent PC materials are: PC1250Y, LC1500 (Idemitsu), LC1700. The chemical name of PC is Polycarbonate;

[0037] 3) Transparent PS material is relatively inexpensive and is generally used in low-level consumer products (such as UK, electricity meters, low-level toys, etc.). The optimal temperature resistance range is relatively narrow, from 0°C to +50°C;

[0038] 4) A simple method to distinguish between PMMA and PC: Use a small knife to cut. If it is easily cut into a long strip without breaking, it is PC material; otherwise, it is PMMA.

[0039] Reflective film: The main function of the reflective film is to reflect the light emitted from the back of the light guide plate back into the light guide plate, so that the light is emitted from the front, that is, the window area of the backlight module. The thickness is generally 0.05 - 0.22 mm; Common models: Nitto Denko 75W05, HW075, 3M - ESR60, 3M - ESR80, Dongxu Cheng 100 - RHD, DuPont RW50, DuPont RW100, UXQ1 - 150, UXE - 188, EXK2 - 225D, etc.

[0040] LED: As a lighting source, it enables the display screen to have sufficient brightness to meet normal visual effects. Mainly white LEDs are used. The mechanism of white light is that the lamp core emits blue light, and a part of the blue light excites the yellow phosphor on the surface. The blue light is converted into yellow light and the remaining blue light form white light through the color mixing principle. Common brands: Jufei, Suijing, Lingtao, Zhengdongming, Everlight, Dongbu, Nichia, Kaiding, Hongqi, Hongbai, Aolund, Zhaochi, Maike, etc. For those with patent requirements, you can choose: Jufei, Seoul, Dongbu, Nichia, etc.

[0041] Backlight FPC: The carrier of the LED, conducting current to supply power for the LED to work, a flexible printed circuit board.

[0042] Plastic Frame: The plastic frame is the skeleton of the backlight, which plays a supporting and reflecting role. It mainly supports each backlight component and the LCD, making them a whole. It can position the screen in the module and the module in the terminal product. In addition, it also plays a role in sealing light on the sides. Because its structure is generally complex and thin, the raw materials used for forming it are required to have good fluidity, strength and toughness. In addition, there are also certain requirements for reflectivity. For example, polycarbonate containing 4% TiO2 has a high reflection coefficient. Commonly used material models: URZ2500, URZ2501 (high reflection grade), PC_EHR3100 (good flexibility), PC white, PC white + glass fiber, etc.

[0043] 1) URZ2501 is a light-emitting material with good reflection and light-shielding properties, and is commonly used in TFT color screen backlights;

[0044] 2) PC white is commonly used in side backlight products;

[0045] 3) PC white + glass fiber is commonly used in bottom backlight products;

[0046] Lower Iron Frame: It strengthens the intensity of the backlight and fixes the LCD module. For small and medium-sized color screens, the main materials used are SUS304, SUS201, SUS430, tinplate SPTE, galvanized aluminum AL-Zn, etc.

[0047] To facilitate the understanding of the above technical solutions of the present invention, the working principle or operation method of the present invention in the actual process will be described in detail below.

[0048] In specific applications, the present invention selects ITO glass with a sheet resistance of 7Ω / square. After etching, a transparent ITO heating resistor is formed on the transparent glass (i.e., a transparent ITO heating resistor glass is formed). Then, silver paste lines are screen-printed on both sides of the ITO to make positive and negative electrodes and lead them out. After the glass edge is bonded by FPC, it is connected to the main board single-chip microcomputer. A thermistor sensor is designed on the FPC (such as Figure 2 shown).

[0049] When the external environment changes, it can automatically control the heating of the transparent ITO heating resistor glass without manual control, and has strong environmental adaptability. When the environmental temperature is less than 0°C, a thin ice layer or water mist is likely to form on the display screen. At this time, the thermistor changes to a certain resistance value, and the main board controls the transparent ITO heating resistor glass to start heating. When the surface temperature of the LCD liquid crystal display screen is greater than 55°C, the thin ice layer or water mist disappears. At this time, the resistance value change information of the thermistor is transmitted to the main board, and the main board controls the transparent ITO heating resistor glass to stop heating.

[0050] Working principle diagram: The liquid crystal display module consists of an upper iron frame, an upper polarizer, an LCD, a driving IC, a lower polarizer, an FPC, a backlight assembly (internal components such as an upper brightness enhancement film, etc.). The working principle of the liquid crystal display module is that when the customer's main board supplies power and data signals to the module FPC, the FPC supplies power and signals to the driving IC, and then through the driving IC to the LCD for driving. After the liquid crystal in the LCD is applied with an electric field, the liquid crystal flips. After polarization by the upper and lower polarizers, and with the backlight power supply emitting light, the LCD display can be seen. Since the liquid crystal in the LCD is between liquid and solid states, when working below -20 degrees Celsius, the response of the liquid crystal in the LCD becomes slower and problems occur. To solve this problem, a glass with a transparent ITO heating resistor is fully attached to the upper iron frame of the liquid crystal display module. When the customer's main board detects that the product surface temperature is lower than the set temperature (such as 0 degrees Celsius), the customer's main board powers on the glass with the transparent ITO heating resistor, and the glass with the transparent ITO heating resistor starts to heat. When the customer's main board detects that the product surface temperature reaches the set temperature (such as 55 degrees Celsius), the customer's main board stops power supply, and the glass with the transparent ITO heating resistor stops heating.

[0051] In summary, by means of the above technical solutions of the present invention, the touch screen heating and defogging module of the present invention can quickly heat up to 55°C - 75°C within 20s - 50s, and the product surface is heated evenly, so that the thin ice layer or water mist on the product surface can be effectively removed and quickly diffused, thereby effectively solving the problems of unclear display screen and automatic touch of the touch screen due to water.

[0052] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "setting", "connection", "fixation", "rotation connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A touch screen heating and defogging module, characterized in that, It includes a lower iron frame (1), a rubber frame (2) is arranged at the top of the lower iron frame (1), a backlight assembly is arranged at the top of the rubber frame (2), a lower polarizer (11) is arranged at the top of the backlight assembly, a liquid crystal display screen (12) is arranged at the top of the lower polarizer (11), an upper polarizer (13) is arranged at the top of the liquid crystal display screen (12), an upper iron frame (14) is arranged at the top of the upper polarizer (13), an ITO heating resistance glass (15) is arranged at the top of the upper iron frame (14), and a glass cover plate (16) is arranged at the top of the ITO heating resistance glass (15); Among them, a driving IC (17) is arranged at one end of the top of the liquid crystal display screen (12), and flexible circuit boards (18) are arranged on one side of the driving IC (17) and on one side of the top of the ITO heating resistance glass (15).

2. The touch screen heating and defogging module according to claim 1, wherein The backlight assembly includes a backlight FPC (3) arranged at one end of the top of the rubber frame (2), and a plurality of LEDs (4) are evenly arranged at the top of the backlight FPC (3).

3. The touch screen heating and defogging module according to claim 2, characterized in that, The backlight assembly further includes a reflection film (5) arranged on the top of the rubber frame (2), a light guide plate (6) is arranged on the top of the reflection film (5), a diffusion film (7) is arranged on the top of the light guide plate (6), a light enhancement film group is arranged on the top of the diffusion film (7), and a light-shielding adhesive (10) is arranged on the top of the light enhancement film group.

4. The touch screen heating and defogging module according to claim 3, wherein The light enhancement film group includes a lower light enhancement film (8) arranged on the top of the diffusion film (7), an upper light enhancement film (9) is arranged on the top of the lower light enhancement film (8), and the top of the upper light enhancement film (9) is connected to the bottom of the light-shielding adhesive (10).

5. The touch screen heating and defogging module according to claim 1, wherein The driving IC (17) and the liquid crystal display screen (12), and the flexible circuit boards (18) and the ITO heating resistance glass (15) and the liquid crystal display screen (12) are all connected through anisotropic conductive films (19).

6. The touch screen heating and defogging module according to claim 1, characterized in that, An ITO heating resistance (20) is etched on the ITO heating resistance glass (15), and the ITO heating resistance (20) is led out as positive and negative electrodes to the flexible circuit board (18) through screen-printed silver paste lines on both sides of the ITO heating resistance glass (15) and is connected to it.

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