Anti-static dust removal mechanism for liquid crystal display screen production

Abstract

The application discloses a kind of anti-static dust removal mechanisms for liquid crystal display screen production, belong to display panel manufacturing field.The mechanism is sequentially arranged pre-charging suspension zone, standing wave excitation stripping zone and zero potential negative pressure recovery zone along the direction of conveyance.Pre-charging suspension zone utilizes detection probe to identify electrostatic polarity, and makes microdust into electrostatic suspension state by same polarity charging component emitting transient high-voltage pulse charge, and is equipped with the flexible edge grounding component of synchronous linkage to provide charge discharge loop;Standing wave excitation stripping zone utilizes high-frequency alternating air valve drive to set micro-gap air knife of face-to-face, forms spatial oscillation pressure field with preset phase difference above panel, and directly acts on suspended microdust by generated vertical acoustic streaming excitation force and strips it;Finally, by negative pressure recovery zone, microdust is recycled and potential is zeroed.The application is coupled by electrostatic body force repulsion and aerodynamic vertical excitation force in time sequence rigidity, significantly improves the removal rate of submicron microdust, effectively prevents TFT array from being punctured.

Description

Technical Field

[0001] This invention relates to the field of display panel manufacturing and fine particle removal technology, specifically to an antistatic dust removal mechanism and method for liquid crystal display production. Background Technology

[0002] In the production process of liquid crystal display panels, submicron-sized dust adhering to the substrate surface is a major cause of product defects.

[0003] Existing dust removal technologies (such as those disclosed in Chinese patent publications CN106040668A and CN114345836A) typically employ a working logic that combines "static electricity elimination" with "mechanical force." Specifically, CN106040668A discloses a method that uses nozzles to spray air onto the display screen and provides an airflow containing both positive and negative charges through a positive and negative charge generating device to remove static electricity; CN114345836A discloses a rolling dust removal device that uses a cleaning roller to remove dust and utilizes triboelectric charging to generate opposite charges to absorb and neutralize the charge on the panel surface. The core of these solutions lies in neutralizing the panel surface potential to near 0V to eliminate electrostatic mirror forces, and then using the shearing force of a high-speed airflow or the friction of the cleaning roller to remove the dust.

[0004] However, the above solutions have the following shortcomings in practical applications: First, neutralizing static electricity only eliminates the electrostatic image force, but at the microscopic scale, the van der Waals forces between dust particles and the panel are still enormous, and simply eliminating static electricity cannot remove submicron-sized dust particles from the surface. Second, for jet dust removal, according to the fluid dynamics boundary layer theory, there is a viscous layer on the panel surface with a flow velocity close to zero, making it difficult for dust particles settled in this layer to be effectively swept away by horizontal airflow; and for rolling contact dust removal, the frequent friction between the cleaning roller and the insulating glass substrate can easily generate secondary electrification, causing the substrate surface to quickly re-adhere to dust particles after dust removal, and contact operations pose a risk of scratching the delicate panel surface. Summary of the Invention

[0005] This invention provides an antistatic dust removal mechanism and method for liquid crystal display production, aiming to solve the problems of difficult micro-dust removal and limitations of sticky underlying layers in the above-mentioned background art.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an anti-static dust removal mechanism for liquid crystal display production, wherein, along the conveying direction of the liquid crystal panel, the dust removal mechanism comprises, in sequence: The pre-charge suspension area is equipped with an electrostatic detection probe, a same-polarity charging component, and a flexible edge grounding component that is synchronously linked with the same-polarity charging component. The electrostatic detection probe is used to detect the electrostatic polarity of the liquid crystal panel surface. The same-polarity charging component is used to emit transient high-voltage pulse charges of the same polarity to the liquid crystal panel surface according to the detected polarity, so as to make the attached dust particles on the panel surface in an electrostatic suspension state through the same-polarity Coulomb repulsion force. The flexible edge grounding component is used to provide a transient charge discharge circuit for the liquid crystal panel. The standing wave excitation stripping zone is equipped with a high-frequency alternating air valve and at least two sets of counter-arranged micro-slit air knives. The high-frequency alternating air valve is used to drive the counter-arranged micro-slit air knives to form a periodic spatial oscillation pressure field with a preset phase difference above the liquid crystal panel. The oscillation pressure field is configured to act directly on the micro-dust when the micro-dust is in an electrostatic suspension state, so as to strip the micro-dust through the vertical acoustic-flow excitation force. The zero-potential negative pressure recovery zone is equipped with a low-pressure laminar flow dust collection hood and a bipolar ion neutralization rod, which are used to recover the stripped micro-dust and neutralize the potential of the dust-removed panel to 0V, respectively.

[0007] Furthermore, the same polarity charging component is configured to output a transient high-voltage pulse charge with an absolute voltage value of 1kV to 8kV and a pulse width of 1μs to 15μs; wherein, the lower limit threshold of the absolute voltage value is configured such that the same polarity Coulomb repulsion force generated on the dust particles is strictly greater than the van der Waals force between the dust particles and the panel surface.

[0008] Furthermore, the flexible edge grounding component includes conductive carbon fiber flexible bristles configured to make light contact with the non-display area of ​​the edge of the liquid crystal panel.

[0009] Furthermore, in the standing wave excitation stripping zone, the jet airflow between the two sets of counter-current micro-slit air knives has a 180° phase difference, so as to form an aerodynamic standing wave above the liquid crystal panel.

[0010] Furthermore, the nozzle of the counter-punching micro-slit air knife is 0.5mm to 2.0mm above the surface of the liquid crystal panel, and the pulsation frequency of the high-frequency alternating air valve is 10kHz to 25kHz.

[0011] The present invention also proposes an antistatic dust removal method for liquid crystal display production using the above-mentioned mechanism, comprising the following steps: S1: The electrostatic polarity of the surface of the liquid crystal panel is detected in real time by an electrostatic detection probe; S2-S3: Based on the detected polarity, apply a transient high voltage pulse of the same polarity through the charging component of the same polarity, and simultaneously open the discharge circuit through the flexible edge grounding component; S4: Using the Coulomb repulsion force of the same polarity, the dust particles overcome the van der Waals force and are in a suspended state; S5-S6: Start the high-frequency alternating gas valve to drive the counter-impact micro-slit air knife to generate spatial standing waves and vertical excitation force. S7: Use the vertical excitation force to peel off micro-dust particles that are in a critical state of suspension; S8-S9: Micro-dust is recovered through a low-pressure laminar flow dust collection hood, and bipolar ion neutralization rods are used to release bipolar ions to neutralize the potential to 0V.

[0012] Furthermore, steps S5-S6 are introduced during the period when the micro-dust is in a suspended state in step S4, so as to achieve a time-sequential rigid coupling between electrostatic repulsion and aerodynamic excitation force.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention emits transient pulse charges of the same polarity as the dust particles onto the panel surface through a same polarity charging component, thereby generating a Coulomb repulsion force of the same polarity between the dust particles and the panel surface. This Coulomb repulsion force is used to overcome the van der Waals force between the dust particles and the panel, putting the dust particles in an electrostatic suspension state, thus providing a physical prerequisite for subsequent peeling.

[0014] 2. This invention generates a spatial oscillating pressure field by driving a micro-slit air knife with a high-frequency alternating air valve to counteract the pressure. This results in the generation of a high-frequency oscillating acoustic stream perpendicular to the panel direction at the pressure counterpoint. This acoustic stream penetrates the fluid viscous layer close to the panel surface, achieving vertical upward vibration and stripping of suspended micro-dust settled in the viscous layer.

[0015] 3. This invention achieves the synergy of two physical forces by rigidly coupling the "electrostatic suspension state" brought about by the repulsive force of like-polarity charges with the "vertical excitation force" brought about by the spatial oscillation pressure field in a time sequence, thereby improving the removal efficiency of submicron-level stubborn dust.

[0016] 4. By setting up a flexible edge grounding component that is synchronously linked with the same polarity charging component, the present invention provides a transient discharge circuit for the bottom of the panel when a high voltage pulse charge is applied, effectively reducing the risk of electric field penetration damage to the thin film transistor (TFT) array inside the panel caused by the high voltage charge.

[0017] 5. This invention utilizes Coulomb repulsion and vertical excitation force as the main dust removal power, reducing the system's dependence on macroscopic high-velocity purging airflow, and enabling dust removal operations to be completed at lower macroscopic airflow velocities, thereby reducing the generation of secondary static electricity caused by airflow friction. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an antistatic dust removal mechanism for liquid crystal display production according to an embodiment of the present invention; Figure 2 This is a partially enlarged schematic diagram of the second-stage standing wave excitation stripping mechanism in an embodiment of the present invention; Figure 3 This is a flowchart illustrating the process of an antistatic dust removal mechanism for liquid crystal display production according to an embodiment of the present invention.

[0019] In the diagram: 1. LCD panel; 2. Conveyor roller; 3. Flexible edge grounding component; 4. Electrostatic detection probe; 5. Same polarity charging component; 6. High-frequency alternating air valve; 7. Counter-current micro-slit air knife; 8. Low-pressure laminar flow dust collection hood; 9. Bipolar ion neutralization rod; 100. Pre-charge suspension zone; 200. Standing wave excitation stripping zone; 300. Zero potential negative pressure recovery zone. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are all based on the actual direction of travel when the device lays the geomembrane. They are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Reference Figures 1 to 3An anti-static dust removal mechanism for LCD screen production is disclosed. During operation, the LCD panel 1 to be cleaned is horizontally placed on a conveyor roller 2 and driven by the conveyor roller 2 to move forward at a constant speed along a predetermined conveying direction. The mechanism is spatially divided into three continuous operating areas according to the process flow: a pre-charging suspension zone 100, a standing wave excitation stripping zone 200, and a zero-potential negative pressure recovery zone 300. The pre-charging suspension zone 100 is located at the front end of the entire mechanism and contains an electrostatic detection probe 4 and a same-polarity charging component 5. The electrostatic detection probe 4 is a non-contact high-precision potentiometer with a response time controlled within 50ms, used to capture the dominant electrostatic polarity and potential distribution on the surface of the LCD panel 1 in real time. The same-polarity charging component 5 typically employs a high-frequency pulsed ion emission array, which is logically locked to the electrostatic detection probe 4 via a control unit. When the electrostatic detection probe 4 detects a negative charge on the surface of the LCD panel 1, the control unit drives the same-polarity charging component 5 to generate a high-concentration negative ion pulse through tip discharge, rather than the positive and negative ion neutralization method used in traditional technologies.

[0023] In the pre-charge suspension region 100, the absolute value of the pulse voltage emitted by the same-polarity charging component 5 is set between 1kV and 8kV. The logic for selecting this voltage value is as follows: its lower limit must ensure that sufficient same-polarity charge is induced on the dust particles on the surface of the liquid crystal panel 1, thereby generating a Coulomb repulsion force sufficient to overcome the van der Waals force between the dust particles and the panel surface; its upper limit is limited by the dielectric breakdown voltage of the glass substrate of the liquid crystal panel 1 to prevent arc discharge. At the same time, the pulse width is strictly controlled between 1μs and 15μs. This extremely short pulse width design utilizes the skin effect of high-frequency charge and matches the RC time constant of the internal circuit of the liquid crystal panel 1, so that the injected high-voltage charge is mainly constrained to the outermost layer of the glass substrate, preventing current from penetrating to the underlying thin-film transistor array. At this time, under the action of strong Coulomb repulsion, the dust particles actively break free from the constraints of the van der Waals force and exhibit an unstable electrostatic suspension state on the panel surface, eliminating mechanical obstacles for subsequent physical peeling.

[0024] like Figure 1 As shown, to further protect the delicate circuitry inside the LCD panel 1, a follow-up flexible edge grounding component 3 is provided below the pre-charge floating area 100. This component uses flexible conductive carbon fiber bristles, with the upper ends of the bristles lightly touching the non-display area at the edge of the LCD panel 1. The flexible edge grounding component 3 is synchronously linked with the same-polarity charging component 5, meaning that the grounding loop is activated the instant a pulse charge of the same polarity is applied. This structure provides a transient charge discharge path for the panel, effectively guiding the release of induced charges that may accumulate between layers to the ground, preventing device damage caused by excessive interlayer potential differences.

[0025] The LCD panel 1 then enters the standing wave excitation stripping zone 200. This zone is equipped with a high-frequency alternating air valve 6 and two sets of micro-slit air knives 7 arranged 180° opposite each other. The nozzle of the micro-slit air knife 7 is positioned at a height of 0.5 mm to 2.0 mm above the surface of the LCD panel 1 to ensure concentrated airflow force. The pulsation frequency of the high-frequency alternating air valve 6 is controlled between 10 kHz and 25 kHz. There is a preset phase difference between the airflows emitted by the two sets of opposing micro-slit air knives 7. This periodic alternating flow field does not form a macroscopic large-volume advection above the LCD panel 1, but rather forms alternating pressure nodes and anti-nodes in space through fluid interference, thus generating aerodynamic standing waves. At the pressure anti-node positions, air particles undergo high-frequency vertical oscillations, and this upward vertical energy directly penetrates the adhesive sublayer tightly adhering to the panel surface. For microparticles that were previously in a critical suspended state, this vertical excitation force provides the final stripping kinetic energy, allowing them to completely detach from the potential energy trap on the panel surface and enter the controlled airflow layer above.

[0026] Finally, the LCD panel 1 passes through the zero-potential negative pressure recovery zone 300. This zone is equipped with a large-diameter low-pressure laminar flow dust collection hood 8, whose internal negative pressure is maintained at a low level to ensure that the recovered airflow is in a laminar flow state, avoiding secondary frictional charging caused by turbulence. The detached and ionized micro-dust enters the dust collection hood 8 with the laminar flow and is filtered and collected. Downstream of or inside the dust collection hood 8, there is also a bipolar ion neutralization rod 9. The bipolar ion neutralization rod 9 generates equal amounts of positive and negative ion clouds through alternating current discharge, performing the final neutralization treatment on the residual charge on the surface of the LCD panel 1. Finally, the electrostatic potential on the surface of the LCD panel 1 is reduced to about 0V, achieving a clean and electrostatically balanced output state.

[0027] Through the sequential collaboration of the three functional zones mentioned above, this mechanism transforms static electricity from a cleaning resistance into a stripping aid. First, it utilizes repulsive forces of the same polarity to disrupt the microscopic force balance. Then, it leverages the acoustic flow effect of spatial standing waves to break down the fluid boundary layer. Finally, it completes recovery and neutralization in a low-speed environment. This non-contact operation mode ensures a submicron-level dust removal rate while avoiding the risk of secondary electrification caused by high-speed purging and the potential scratches from mechanical contact.

[0028] The above description of the embodiments is intended to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. An antistatic dust removal mechanism for liquid crystal display production, characterized in that, The following are included sequentially along the conveying direction of the liquid crystal panel (1): The pre-charged suspension area (100) is equipped with an electrostatic detection probe (4), a same-polarity charging component (5), and a flexible edge grounding component (3) that is synchronously linked with it; the same-polarity charging component (5) emits a same-polarity transient high-voltage pulse charge according to the electrostatic polarity of the panel surface detected by the electrostatic detection probe (4), so that the dust particles are in an electrostatic suspension state; the flexible edge grounding component (3) is used to provide a transient charge discharge circuit; The standing wave excitation stripping zone (200) is provided with a high-frequency alternating air valve (6) and at least two sets of micro-slit air knives (7) arranged in opposition; the high-frequency alternating air valve (6) drives the opposing micro-slit air knives (7) to form a periodic spatial oscillation pressure field with a preset phase difference above the panel. The oscillation pressure field is configured to act directly on the micro-dust when the micro-dust is in an electrostatic suspension state, so as to strip the micro-dust through the vertical acoustic flow excitation force. The zero-potential negative pressure recovery zone (300) is equipped with a low-pressure laminar flow dust collection hood (8) and a bipolar ion neutralization rod (9), which are used to recover micro-dust and neutralize the panel potential to 0V, respectively.

2. The antistatic dust removal mechanism according to claim 1, characterized in that, The same polarity charging component (5) is configured to output a transient high voltage pulse charge with an absolute voltage value of 1kV to 8kV and a pulse width of 1μs to 15μs; wherein, the lower limit threshold of the absolute voltage value is configured such that the same polarity Coulomb repulsion force generated on the dust is strictly greater than the van der Waals force between the dust and the panel surface.

3. The antistatic dust removal mechanism according to claim 1, characterized in that, The flexible edge grounding component (3) includes conductive carbon fiber flexible bristles configured to make light contact with the non-display area of ​​the edge of the liquid crystal panel (1).

4. The antistatic dust removal mechanism according to claim 1, characterized in that, In the standing wave excitation stripping zone (200), there is a 180° phase difference between the jet airflows of the two sets of counter-current micro-slit air knives (7) to form an aerodynamic standing wave above the liquid crystal panel (1).

5. The antistatic dust removal mechanism according to claim 1, characterized in that, The nozzle of the counter-punching micro-slit air knife (7) is 0.5 mm to 2.0 mm above the surface of the liquid crystal panel (1), and the pulsation frequency of the high-frequency alternating air valve (6) is 10 kHz to 25 kHz.

6. A method for antistatic dust removal in the production of liquid crystal displays using the mechanism described in any one of claims 1-5, characterized in that, Includes the following steps: S1: The electrostatic polarity of the surface of the liquid crystal panel (1) is detected in real time by the electrostatic detection probe (4); S2-S3: Based on the detected polarity, apply a transient high voltage pulse of the same polarity through the same polarity charging component (5), and simultaneously open the discharge circuit through the flexible edge grounding component (3); S4: Using the Coulomb repulsion force of the same polarity, the dust particles overcome the van der Waals force and are in a suspended state; S5-S6: Start the high-frequency alternating gas valve (6) to drive the counter-impact micro-slit air knife (7) to generate spatial standing waves and vertical excitation force; S7: Use the vertical excitation force to peel off micro-dust particles that are in a critical state of suspension; S8-S9: Micro-dust is recovered by a low-pressure laminar flow dust collection hood (8), and bipolar ions are released by a bipolar ion neutralization rod (9) to neutralize the potential to 0V.

7. The antistatic dust removal method according to claim 6, characterized in that, Steps S5-S6 are introduced during the period when the micro-dust is in a suspended state in step S4, so as to achieve a time-sequential rigid coupling between electrostatic repulsion and aerodynamic excitation force.

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