TFT-LCD display module with a-Si panel and RGB driver IC

Abstract

The application discloses a TFT-LCD display module of a-Si panel matched with an RGB Driver IC, which comprises an outer frame, a protection mounting frame is assembled in the outer frame, and a TFT-LCD display module is embedded in the protection mounting frame; a heat conduction plate is fixedly mounted at the bottom of the mounting upper frame, and a plurality of radiating fins are fixedly arranged on the lower surface of the heat conduction plate; the radiating fins extend into a radiating channel and are sleeved with a cooling liquid pipe, so as to form a heat exchange structure combining air cooling and liquid cooling; a master control single-chip microcomputer divides low-temperature standby, medium-temperature normal and high-temperature high-brightness three types of working conditions according to two-stage temperature threshold values, and matches gradient radiating modes; through a built-in PID flow closed-loop control module, the viscosity state is determined in combination with the cooling liquid temperature, the power of a variable frequency pump is dynamically adjusted, the flow deviation caused by the viscosity fluctuation is compensated, and the pipeline flow stability is ensured; the application solves the problems of single radiating mode, easy flow interference of medium physical properties and unreasonable energy consumption control of a traditional module, has high radiating efficiency and good temperature control stability, and is suitable for multi-scene long-time display operation.

Description

Technical Field

[0001] This invention relates to the field of liquid crystal display module technology, and more particularly to a TFT-LCD display module with an a-Si panel and an RGB driver IC. Background Technology

[0002] During operation, the backlight assembly and driving circuit of the a-Si material TFT-LCD display module continuously generate heat. If the heat cannot be dissipated in time, it is easy to cause the panel temperature to rise too high, which can lead to problems such as color shift, abnormal operation of the driver IC, and screen flickering. This seriously affects the display effect and product lifespan. Therefore, heat dissipation structure has become the core point in the design of this type of display module.

[0003] Currently, most conventional TFT-LCD display modules rely solely on simple heat sinks on the back for natural air cooling. This single cooling method results in low efficiency and can only meet the needs of low-load, normal-temperature applications. When the module is under high-load conditions such as high-brightness full-screen display or prolonged full-load operation, internal heat accumulates rapidly, and simple air cooling is insufficient to dissipate heat quickly, demonstrating a significant limitation in heat dissipation capacity. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problems existing in the prior art and to provide a TFT-LCD display module with an a-Si panel and an RGB driver IC.

[0005] To achieve the above objectives, the technical solution provided by the present invention is: a TFT-LCD display module with an a-Si panel and an RGB driver IC, comprising an outer frame, the outer frame including a detachable and mating upper mounting frame and a heat dissipation bottom frame; a coolant tank and a control box are fixedly provided on the outer side wall of the heat dissipation bottom frame; a protective mounting frame is detachably assembled inside the upper mounting frame, and the TFT-LCD display module is embedded inside the protective mounting frame; a heat-conducting plate is fixedly installed at the bottom of the upper mounting frame, the upper surface of the heat-conducting plate abuts against the bottom of the TFT-LCD display module, and a plurality of heat sinks are fixedly arranged in an array on the lower surface of the heat-conducting plate; The heat dissipation base frame has a hollow heat dissipation channel inside. Heat dissipation holes are opened on the periphery of the heat dissipation base frame. Coolant pipes are arranged horizontally inside the heat dissipation channel. The coolant pipes are fixed to the inner wall of the heat dissipation channel by mounting sleeves. Several heat dissipation fins extend downward and into the heat dissipation channel at their lower ends. All heat dissipation fins are sleeved on the coolant pipes. The bottom ends of the heat dissipation fins are fixedly connected to the bottom surface of the inner wall of the heat dissipation channel. A variable frequency speed control pump is installed inside the coolant tank. The variable frequency speed control pump is connected to the coolant pipe to form a closed coolant circulation loop. A temperature sensor is installed on the inner wall of the heat dissipation channel. A liquid temperature probe and a flow sensor are installed on the coolant pipe. The temperature sensor, liquid temperature probe, flow sensor and variable frequency speed control pump are all electrically connected to the control box. The control box has a built-in microcontroller. Based on the temperature signal collected by the temperature sensor, the microcontroller divides the operating status of the TFT-LCD display module into low-temperature conditions for start-stop standby, medium-temperature conditions for normal display, and high-temperature conditions for high-load and high-brightness display, and matches the corresponding gradient heat dissipation mode. In low-temperature conditions, the variable frequency speed control pump body is shut down, and natural air cooling is achieved by relying on heat sinks and heat dissipation holes. Under both medium and high temperature conditions, the natural air-cooling structure remains unchanged. The main control microcontroller increases the output power of the variable frequency speed-regulating pump body based on the collected temperature signal, increases the flow rate of the coolant inside the coolant pipe, thereby increasing the flow rate per unit time in the coolant pipe. Through liquid cooling heat exchange, the heat exchange efficiency is enhanced, achieving a match between heat dissipation energy consumption and heat dissipation efficiency.

[0006] Preferably, the main control microcontroller presets a first temperature threshold and a second temperature threshold, wherein the first temperature threshold is less than the second temperature threshold; Determination of start-stop standby working mode: The temperature sensor collects the temperature T in the heat dissipation channel in real time. When T < the first temperature threshold, it is determined that the TFT-LCD display module (1) is in a low temperature working condition. Determination of normal operating mode: The temperature sensor collects the temperature T in the heat dissipation channel in real time. When the first temperature threshold ≤ T < the second temperature threshold, the TFT-LCD display module is determined to be in medium temperature condition. Determination of high-load, high-brightness display mode: The temperature sensor collects the temperature T in the heat dissipation channel in real time. When T ≥ the second temperature threshold, the TFT-LCD display module is determined to be in a high-temperature operating condition.

[0007] Furthermore, the main control microcontroller has a built-in PID flow closed-loop control module, which includes a PID calculation module and a PID controller. Under low-temperature conditions, the TFT-LCD display module: the variable frequency speed control pump body stops and goes into hibernation, and the flow sensor goes into standby mode; Under medium-temperature conditions, the TFT-LCD display module operates as follows: The main control microcontroller presets a constant flow rate value for the coolant at medium temperature; a flow sensor collects the actual flow rate of the coolant in the coolant pipe in real time and feeds it back to the PID calculation module; the PID calculation module compares the deviation between the actual flow rate and the preset constant flow rate value at medium temperature; a liquid temperature probe simultaneously collects the coolant temperature and sends it back to the PID calculation module; the PID calculation module combines the real-time coolant temperature to determine its actual viscosity; combining the deviation and the coolant viscosity, the PID controller adjusts the power of the variable frequency speed-regulating pump to compensate for the flow loss caused by changes in coolant viscosity, thus maintaining a constant actual flow rate in the coolant pipe. Under high-temperature conditions, the TFT-LCD display module operates as follows: A preset constant flow rate value for the coolant is established within the main control microcontroller; the actual flow rate of the coolant in the pipe is collected in real time by a flow sensor and fed back to the PID calculation module. The PID calculation module compares the deviation between the actual flow rate and the preset constant flow rate value; a liquid temperature probe simultaneously collects the real-time temperature of the coolant and sends it back to the PID calculation module. The PID calculation module predicts the dynamic change trend of the coolant viscosity based on the real-time temperature; combining the flow deviation and the dynamic change trend of the coolant viscosity, the PID calculation module uses proportional-integral-derivative calculations to dynamically correct the output power of the variable frequency speed control pump, offsetting the flow deviation caused by coolant viscosity fluctuations under high-temperature conditions and maintaining a constant actual flow rate in the coolant pipe.

[0008] Furthermore, the PID calculation module for determining coolant viscosity and compensating for flow rate under medium-temperature conditions includes the following methods: When the coolant is cold, its viscosity increases and the flow resistance increases. When the actual flow rate is lower than the set constant flow rate value at medium temperature, the PID controller automatically increases the output power of the variable frequency speed control pump to compensate for the flow resistance loss caused by the viscosity. When the coolant temperature rises, the viscosity decreases, and the flow resistance decreases, and the actual flow rate is higher than the set constant flow rate value at medium temperature, the PID controller automatically reduces the output power of the variable frequency speed control pump to suppress excessive flow.

[0009] Furthermore, the TFT-LCD display module includes an a-Si liquid crystal panel, a backlight module, and a driving PCB. The a-Si liquid crystal panel consists of, from top to bottom, an upper polarizer, a glass substrate containing RGB color filters, a liquid crystal layer, an a-Si TFT array glass substrate, and a lower polarizer. The RGB driving IC is integrated on the driving PCB, and the color image display is completed through the RGB color filters in conjunction with the RGB driving IC.

[0010] Furthermore, the backlight module consists of a diffuser plate, a backlight source, and a backplate from top to bottom; a diffuser sheet is attached to the base surface above the diffuser plate; the upper polarizer, the glass substrate containing RGB color filters, the liquid crystal layer, the a-Si TFT array glass substrate, the lower polarizer, the diffuser plate, the backlight source, and the backplate are all connected by adhesive; the driving PCB is fixedly mounted on the back side of the backplate.

[0011] Furthermore, a slot is provided on the inner side of the protective mounting frame, a telescopic rod is installed in the slot, a flexible pad is installed on the telescopic rod, and a spring is provided on the outer ring of the telescopic rod. The two ends of the spring are connected to the flexible pad and the slot wall respectively, so as to realize the elastic limiting protection of the TFT-LCD display module.

[0012] Beneficial effects of this invention: This invention adopts a composite heat dissipation structure that combines air cooling and natural heat dissipation with liquid cooling through coolant pipes. The heat sink is directly sleeved and fixed to the outside of the coolant pipes, resulting in a large heat conduction and heat exchange area and high heat transfer efficiency. It meets the dual requirements of low-temperature, low-energy-consumption heat dissipation and high-temperature, high-power heat dissipation, and completely solves the problem of insufficient heat dissipation capacity of traditional single heat dissipation structures.

[0013] This invention features a three-level automatic heat dissipation mode identification system. Based on the actual workload of the display module and the ambient temperature, it can automatically switch between three heat dissipation modes: standby air cooling, medium-temperature uniform liquid cooling, and high-temperature accelerated liquid cooling. This precisely matches the heat dissipation requirements, ensuring heat dissipation performance while significantly reducing unnecessary heat dissipation energy consumption, thus achieving the optimal balance between heat dissipation efficiency and energy consumption.

[0014] This invention is equipped with a PID flow closed-loop control module, which accurately determines the viscosity state by combining the real-time temperature of the coolant. It can effectively compensate for the flow deviation caused by changes in viscosity and flow resistance due to changes in coolant temperature. It can accurately stabilize the flow at medium temperature and predict and correct flow fluctuations at high temperature, completely solving the defects of unstable flow and poor heat dissipation uniformity in traditional constant flow liquid cooling systems, and greatly improving heat dissipation stability. Attached Figure Description

[0015] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the TFT-LCD display module of the present invention; Figure 4 This is a schematic diagram of the outer frame structure of the present invention viewed from the front. Figure 5 This is a top view of the heat dissipation base frame of the present invention; Figure 6 This is a schematic diagram of a partial structure of the protective mounting frame of the present invention; Figure 7 This is a schematic diagram showing the connection between the TFT-LCD display module and the protective mounting frame of the present invention; Figure 8 This is a system diagram of the workflow of the present invention.

[0017] Attached image captions: 1-TFT-LCD display module, 2-protective mounting frame, 3-outer frame, 4-mounting upper frame, 5-heat dissipation bottom frame, 6-heat dissipation holes, 7-coolant tank, 8-control box, 9-heat conduction plate, 10-heat dissipation channel, 11-heat sink, 12-coolant pipe, 13-variable frequency speed control pump body, 14-liquid temperature probe, 15-temperature sensor, 16-flow sensor, 17-mounting sleeve, 18-upper polarizer, 19-glass substrate with RGB color filter, 20-liquid crystal layer, 21-a-Si TFT array glass substrate, 22-lower polarizer, 23-diffuser plate, 24-backlight, 25-back plate, 26-drive PCB, 27-flexible pad, 28-telescopic rod, 29-spring. Detailed Implementation

[0018] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not 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 limiting this invention.

[0020] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] Reference Figures 1-7 According to a preferred embodiment of the present invention, a TFT-LCD display module with an a-Si panel and an RGB driver IC includes an outer frame 3. The outer frame 3 includes a detachable and mating upper mounting frame 4 and a heat dissipation bottom frame 5. A coolant tank 7 and a control box 8 are fixedly provided on the outer side wall of the heat dissipation bottom frame 5. A protective mounting frame 2 is detachably assembled inside the upper mounting frame 4, and a TFT-LCD display module 1 is embedded inside the protective mounting frame 2. A heat conduction plate 9 is fixedly installed at the bottom of the upper mounting frame 4. The upper surface of the heat conduction plate 9 abuts against the bottom of the TFT-LCD display module 1, and a plurality of heat sinks 11 are fixedly arranged in an array on the lower surface of the heat conduction plate 9. The heat dissipation base frame 5 has a hollow heat dissipation channel 10 inside. Heat dissipation holes 6 are opened on the periphery of the heat dissipation base frame 5 (preferably, the heat dissipation holes 6 are circular through holes with a diameter of 3mm, arranged in a matrix, with an opening rate of ≥25%, and dustproof mesh is attached to the inside of the heat dissipation holes 6 to meet both ventilation and dust prevention requirements). Coolant pipes 12 are arranged horizontally inside the heat dissipation channel 10, and the coolant pipes 12 are fixed to the inner wall of the heat dissipation channel 10 by mounting sleeves 17. Several heat dissipation fins 11 extend downward and into the heat dissipation channel 10, and the heat dissipation fins 11 are all sleeved on the coolant pipes 12 (preferably, the heat dissipation fins 11 and the coolant pipes 12 are welded and fixed), and the bottom end of the heat dissipation fins 11 is fixedly connected to the bottom surface of the inner wall of the heat dissipation channel 10.

[0023] Preferably, the heat-conducting plate 9 is made of aluminum alloy 6063 with a thickness of 3mm and an anodized surface; the heat sink 11 is made of pure aluminum with a single sheet thickness of 0.3mm, a height of 15mm, an adjacent spacing of 2.5mm, and an array of 40 sheets; the heat dissipation channel 10 has an inner cavity height of 18mm and a width consistent with the outer frame 3; the coolant pipe 12 is made of copper with an inner diameter of 3mm, an outer diameter of 5mm, a wall thickness of 1mm, and is fixed to the heat sink by soldering.

[0024] The coolant in the coolant tank 7 of this invention is a commonly used industrial low-temperature antifreeze and thermally conductive coolant; preferably, the coolant in this invention is an ethylene glycol-water type low-temperature antifreeze and thermally conductive coolant with a concentration of 45%, an applicable temperature of -30℃ to 110℃, a specific heat of 3.6 kJ / (kg·℃), a thermal conductivity of 0.42 W / (m·K), and a viscosity that decreases exponentially with increasing temperature.

[0025] A variable frequency speed-regulating pump body 13 is installed inside the coolant tank 7. The variable frequency speed-regulating pump body 13 is connected end-to-end with the coolant pipe 12 to form a closed coolant circulation loop (the closed coolant circulation loop is as follows: coolant tank 7 → variable frequency speed-regulating pump body 13 → inlet end of coolant pipe 12 → outlet end of coolant pipe 12 → coolant tank 7, forming a closed loop with no coolant leakage and no external discharge). A temperature sensor 15 is installed on the inner wall of the heat dissipation channel 10, and a liquid temperature probe 14 and a flow sensor 16 are installed on the coolant pipe 12 respectively. The temperature sensor 15, liquid temperature probe 14, flow sensor 16, and variable frequency speed-regulating pump body 13 are all electrically connected to the control box 8. The temperature sensor 15 is used to detect the temperature inside the heat dissipation channel 10; the liquid temperature probe 14 is used to detect the temperature of the coolant inside the coolant pipe 12; and the flow sensor 16 is used to detect the actual flow rate of the coolant inside the coolant pipe 12. Preferably, the temperature sensor 15 is an NTC thermistor with an accuracy of ±0.5℃ and a response time of ≤100ms, and is installed at the center of the inner wall of the front side of the heat dissipation channel 10; the liquid temperature probe 14 is a contact platinum resistance sensor with an accuracy of ±0.3℃, and is installed close to the outer wall of the inlet end of the coolant pipe 12; the flow sensor 16 is a miniature turbine flow sensor with a range of 0~2L / min and an accuracy of ±2%, and is installed in series at the outlet end of the coolant pipe 12.

[0026] The control box 8 has a built-in main control microcontroller. Based on the temperature signal collected by the temperature sensor 15, the main control microcontroller divides the operating status of the TFT-LCD display module 1 into low temperature conditions for start-stop standby, medium temperature conditions for normal display, and high temperature conditions for high load and high brightness display, and matches the gradient heat dissipation mode accordingly. Preferably, the TFT-LCD display module 1 has a rated power consumption of 18W and a normal display brightness of 300cd / m². 2 Suitable for medium-temperature operating conditions; high-brightness display with a brightness ≥800cd / m² 2 Power consumption ≥25W, corresponding to high temperature conditions; standby power consumption ≤1W, corresponding to low temperature conditions.

[0027] Preferably, the main control microcontroller is an STM32F103C8T6 with a main frequency of 72MHz. It has a built-in 12-bit AD sampling module with a sampling accuracy of ≥1%. It is electrically connected to the temperature sensor 15, the liquid temperature probe 14, the flow sensor 16, and the variable frequency speed control pump body 13 through the GPIO port to realize signal acquisition and power output control.

[0028] In the case of low temperature operation, the variable frequency speed control pump body 13 is shut down, and natural air cooling is achieved by relying on the heat sink 11 and heat dissipation holes 6. Under both medium and high temperature conditions, the natural air cooling structure remains unchanged. The main control microcontroller adjusts the output power of the variable frequency speed pump body 13 based on the collected temperature signal, increases the flow rate of the coolant inside the coolant pipe 12, thereby increasing the flow rate per unit time in the coolant pipe 12. Through liquid cooling heat exchange, the heat exchange efficiency is enhanced, and the matching of heat dissipation energy consumption and heat dissipation efficiency is achieved.

[0029] Preferably, the variable frequency speed control pump body 13 in this invention is a miniature brushless DC variable frequency pump with a rated voltage of 12V, a rated power of 5W to 25W, a flow rate adjustment range of 0.2 L / min to 1.5 L / min, a speed range of 1000r / min to 6000r / min, and a response time of ≤200ms, which meets the requirements for rapid flow rate adjustment under medium and high temperature conditions. Specifically, in actual assembly and use, the TFT-LCD display module 1 is first fixedly embedded inside the protective mounting frame 2. Then, the assembled protective mounting frame 2 is detachably installed into the mounting upper frame 4, completing the rapid assembly of the display body. The heat-conducting plate 9 at the bottom of the mounting upper frame 4 is tightly attached to the bottom of the TFT-LCD display module 1, enabling rapid and even conduction of the heat generated by the TFT-LCD display module 1 to the arrayed heat sinks 11 below. The lower end of the heat sinks 11 extends into the heat dissipation channel 10 of the heat dissipation base frame 5 and is sleeved and fixed to the outside of the coolant pipe 12. This invention utilizes the arrayed heat sinks 11... The system utilizes natural air cooling through the heat dissipation holes 6, while simultaneously achieving heat transfer through the coolant pipes 12 within the heat dissipation channel 10. This constructs an integrated composite heat exchange structure combining air cooling and liquid cooling, breaking away from the traditional independent layout of heat dissipation structures. This significantly shortens the heat transfer path, improves heat exchange efficiency, and solves the problem of insufficient heat dissipation capacity of traditional single heat dissipation structures. Furthermore, the system can flexibly switch heat dissipation modes according to the actual heating state of the TFT-LCD display module 1, and rationally control the operating power consumption of the variable frequency speed control pump body 13 while meeting heat dissipation requirements. This balances the dual needs of low-temperature, low-energy-consumption heat dissipation and high-temperature, high-power heat dissipation, avoiding energy waste caused by long-term full-load operation.

[0030] In this embodiment, the main control microcontroller presets a first temperature threshold and a second temperature threshold, with the first temperature threshold being lower than the second temperature threshold; preferably, the first temperature threshold is 40°C and the second temperature threshold is 55°C. These thresholds are set based on the normal operating temperature of the TFT-LCD display module 1, the backlight heating power, and the temperature rise characteristics of prolonged high-brightness display, ensuring that the module can operate stably under different loads.

[0031] Determination of start-stop standby working mode: Temperature sensor 15 collects the temperature T in the heat dissipation channel 10 in real time. When T < the first temperature threshold, it is determined that the TFT-LCD display module 1 is in a low temperature working condition. Determination of normal operating mode: Temperature sensor 15 collects the temperature T in the heat dissipation channel 10 in real time. When the first temperature threshold ≤ T < the second temperature threshold, the TFT-LCD display module 1 is determined to be in medium temperature condition. Determination of high-load, high-brightness display mode: Temperature sensor 15 collects the temperature T in the heat dissipation channel 10 in real time. When T ≥ the second temperature threshold, the TFT-LCD display module 1 is determined to be in a high-temperature condition.

[0032] In this embodiment, the industrially commonly used low-temperature antifreeze and heat-conducting coolant selected by the present invention has the physical characteristics that its viscosity decreases and its fluidity increases with higher temperatures, while its viscosity increases and its flow resistance increases with lower temperatures. If the pump's power supply voltage / power is adjusted solely for speed control, the following will occur: the flow rate will be smaller at low temperatures and larger at high temperatures under the same voltage, resulting in large fluctuations in the actual coolant delivery flow rate and unstable heat dissipation. The present invention introduces a flow sensor 16 to collect the actual flow rate of the coolant pipe 12 in real time, and combines it with PID closed-loop adjustment of the output power of the variable frequency speed-regulating pump 13. This abandons the simple voltage-controlled speed mode and uses the target constant flow rate as the control benchmark to offset the flow deviation caused by changes in coolant temperature and viscosity; specifically as follows: The main control microcontroller has a built-in PID flow closed-loop control module, which includes a PID calculation module and a PID controller. Under low temperature conditions, the TFT-LCD display module 1: the variable frequency speed control pump body 13 stops and goes into hibernation, and the flow sensor 16 is in standby mode; at this time, the heat sink 11 and the heat dissipation holes 6 on the side wall of the heat dissipation channel 10 form natural convection air cooling, without the need to start liquid cooling circulation, thus minimizing the power consumption in standby mode. Under medium-temperature conditions, the TFT-LCD display module 1 operates as follows: a constant flow rate of coolant at medium temperature is preset in the main control microcontroller; the flow sensor 16 collects the actual flow rate of coolant in the coolant pipe 12 in real time and feeds it back to the PID calculation module, which compares the deviation between the actual flow rate and the preset constant flow rate at medium temperature; the liquid temperature probe 14 simultaneously collects the coolant temperature and sends it back to the PID calculation module; the PID calculation module combines the real-time temperature of the coolant to determine its actual viscosity; combining the deviation and the viscosity of the coolant, the PID controller adjusts the power of the variable frequency speed pump 13 to compensate for the flow loss caused by the change in coolant viscosity and maintain a constant actual flow rate in the coolant pipe 12. Under medium-temperature conditions, for two situations where the low-temperature coolant has high viscosity and high flow resistance, resulting in insufficient flow, or where the temperature rises and the viscosity decreases, resulting in excessive flow, the variable frequency speed control pump body 13 power is adjusted in real time to accurately compensate for flow deviation, ensuring stable coolant flow under medium-temperature conditions and achieving smooth and uniform liquid cooling heat dissipation. Under high-temperature conditions, the TFT-LCD display module 1 operates as follows: A constant high-temperature flow rate for the coolant is preset within the main control microcontroller; the actual flow rate of the coolant in the coolant pipe 12 is collected in real-time by the flow sensor 16 and fed back to the PID calculation module. The PID calculation module compares the deviation between the actual flow rate and the preset constant high-temperature flow rate; the liquid temperature probe 14 simultaneously collects the real-time temperature of the coolant and sends it back to the PID calculation module. The PID calculation module predicts the dynamic change trend of the coolant viscosity based on the real-time temperature of the coolant; combining the flow deviation and the dynamic change trend of the coolant viscosity, the PID calculation module uses proportional-integral-derivative calculations to dynamically correct the output power of the variable frequency speed pump 13, offsetting the flow deviation caused by the viscosity fluctuation of the coolant under high-temperature conditions, and maintaining a constant actual flow rate in the coolant pipe 12; significantly increasing the coolant circulation speed, enhancing the liquid cooling heat exchange efficiency, and quickly removing the large amount of heat generated by the high-load operation of the TFT-LCD display module 1, thus avoiding high-temperature failures.

[0033] Preferably, the constant flow rate of the coolant at medium temperature is 0.6 L / min; the constant flow rate of the coolant at high temperature is 1.2 L / min; the above values ​​are determined based on the size of the heat dissipation channel 10, the number of heat sinks 11, and the heat exchange requirements.

[0034] Preferably, the parameters of the PID flow closed-loop control module are set as follows: proportional coefficient P=3.0, integral coefficient I=0.15, derivative coefficient D=0.08; sampling period is 100ms, adjustment period is 200ms; allowable flow deviation range is ±3%, and adjustment is started immediately if the deviation range is exceeded; the output power limit of the variable frequency speed control pump body 13 is 10%~100%.

[0035] It should be further explained that: Under normal medium-temperature display conditions, the heat generation of TFT-LCD display module 1 is stable, the coolant temperature remains within a stable range, and the viscosity does not continuously shift dynamically. Only the real-time coolant temperature needs to be collected to determine the current static viscosity state, and the static flow compensation adjustment can be completed. Under high-load and high-brightness conditions, the high heat output of TFT-LCD display module 1 causes the coolant to continuously absorb heat and rise in temperature. The viscosity shows a continuous decreasing trend as the temperature rises. The determination of the single instantaneous viscosity state has an adjustment lag. Therefore, it is necessary to combine the temperature change rate to predict the dynamic change trend of viscosity. Based on the trend prediction, PID advanced flow control can be realized to quickly offset the flow fluctuation caused by the continuous decrease in viscosity at high temperature and ensure the heat dissipation stability under high-load conditions.

[0036] Specifically, the PID flow closed-loop control module overcomes the shortcomings of traditional pumps that cannot adapt to changes in coolant properties, achieving stable and controllable coolant delivery flow under all operating conditions, keeping the liquid cooling heat exchange intensity uniform and stable, ensuring balanced overall heat dissipation from the flow control level, and adapting to the stable heat dissipation requirements of the TFT-LCD display module 1 across the entire load range.

[0037] Furthermore, the PID calculation module for determining coolant viscosity and compensating for flow rate under medium-temperature conditions includes the following methods: When the coolant is cold, its viscosity increases and the flow resistance increases. When the actual flow rate is lower than the set constant flow rate value at medium temperature, the PID controller automatically increases the output power of the variable frequency speed control pump 13 to compensate for the flow resistance loss caused by the viscosity. When the coolant temperature rises, the viscosity decreases, and the flow resistance decreases, and the actual flow rate is higher than the set constant flow rate value at medium temperature, the PID controller automatically reduces the output power of the variable frequency speed control pump body 13 to suppress excessive flow.

[0038] It should be noted that the coolant used in this embodiment is a commonly used industrial low-temperature antifreeze and thermally conductive coolant. The dynamic viscosity of this type of coolant has a stable correlation with its own temperature. Therefore, the method for determining the viscosity of the coolant is as follows: The first method is a lookup table determination: a temperature-viscosity parameter comparison table provided by the coolant manufacturer is pre-stored in the main control microcontroller. After the liquid temperature probe 14 collects the real-time temperature of the coolant, the main control microcontroller retrieves the built-in comparison table and directly matches and obtains the actual viscosity value and flow resistance coefficient of the coolant at the current temperature, thus completing the quantitative determination of the viscosity state. Preferably, the main control microcontroller has a built-in temperature-viscosity comparison table with some key data as follows: 0℃→6.5 mPa·s; 10℃→4.2 mPa·s; 25℃→2.1 mPa·s; 40℃→1.4 mPa·s; 55℃→0.9 mPa·s; 70℃→0.6 mPa·s.

[0039] The second method is a formula fitting calculation: based on the physicochemical properties of the coolant, a formula for calculating the relationship between temperature and dynamic viscosity is obtained. The real-time collected coolant temperature is substituted into the calculation formula to calculate the current precise viscosity value of the coolant, thus completing the quantitative determination of the viscosity state; preferably, the formula fitting calculation method specifically adopts an exponential fitting formula: in t is the dynamic viscosity (mPa·s), t is the real-time temperature of the coolant (°C), and the calculation error is ≤±3%.

[0040] In summary, the complete PID closed-loop constant flow control logic of this invention is as follows: The control box 8 pre-enters the corresponding standard target flow rate according to the working scenario of the display module; the flow sensor 16 collects the actual flow rate of the pipeline in real time and sends it back to the PID calculation module; the PID calculation module compares the actual flow rate with the set target flow rate and calculates the flow deviation value; combined with the real-time temperature of the coolant, it predicts the viscosity change trend and optimizes the output; the output adjustment signal is sent to the variable frequency speed control pump 13 to dynamically correct the output power of the variable frequency speed control pump 13; a complete closed-loop cycle of flow acquisition → deviation calculation → viscosity compensation → pump adjustment → flow re-acquisition is formed to always ensure that the actual flow rate of the coolant in the pipeline is accurate and constant.

[0041] In this embodiment, the TFT-LCD display module 1 includes an a-Si liquid crystal panel, a backlight module, and a driving PCB 26. The a-Si liquid crystal panel consists of an upper polarizer 18, a glass substrate 19 containing RGB color filters, a liquid crystal layer 20, an a-Si TFT array glass substrate 21, and a lower polarizer 22 from top to bottom. The RGB driving IC is integrated on the driving PCB 26, and the color image display is completed by the RGB color filters in conjunction with the RGB driving IC.

[0042] Furthermore, the backlight module consists of a diffuser plate 23, a backlight source 24, and a backplate 25 from top to bottom; a diffuser sheet is attached to the base surface above the diffuser plate 23; the upper polarizer 18, the glass substrate 19 containing RGB color filters, the liquid crystal layer 20, the a-Si TFT array glass substrate 21, the lower polarizer 22, the diffuser plate 23, the backlight source 24, and the backplate 25 are all connected by adhesive; the driving PCB 26 is fixedly mounted on the back side of the backplate 25.

[0043] Specifically, the TFT-LCD display module 1 of the present invention has a reasonable overall layered structure design, the a-Si panel with RGB driver IC has a stable imaging effect, the backlight components are arranged in a regular manner, the layers are firmly bonded, the display quality is clear, the color reproduction is high, and it is suitable for long-term continuous working scenarios.

[0044] In this embodiment, a slot is provided on the inner side of the protective mounting frame 2, and a telescopic rod 28 is provided in the slot. A flexible plate pad 27 is provided on the telescopic rod 28, and a spring 29 is provided on the outer ring of the telescopic rod 28. The two ends of the spring 29 are respectively connected to the flexible plate pad 27 and the slot wall to realize elastic limiting protection for the TFT-LCD display module 1. Preferably, the travel of the telescopic rod 28 is 5mm, the stiffness of the spring 29 is 1.2N / mm, and the flexible plate pad 27 is made of silicone material with a hardness of Shore 30A and a thickness of 2mm.

[0045] Specifically, during assembly and use, the TFT-LCD display module 1 is first fixedly embedded inside the protective mounting frame 2. The elastic limiting structure composed of the telescopic rod 28, spring 29 and flexible pad 27 on the inner side of the protective mounting frame 2 is used to flexibly clamp and fix the TFT-LCD display module 1, thereby forming an all-round shock absorption and buffer protection for the built-in TFT-LCD display module 1, effectively resisting vibration, squeezing and impact during transportation, installation and use, preventing problems such as cracking, misalignment and delamination damage of the LCD panel, and extending the overall service life of the TFT-LCD display module 1. At the same time, the elastic structure is adapted to small dimensional tolerances, making the assembly adaptability stronger.

[0046] The invention features a compact and simple overall structure, convenient assembly of the outer frame, and a well-organized layout of internal sensors and circulation pipelines. It has moderate production costs, is suitable for mass production and processing, and can be widely applied to various LCD display devices, with broad market application prospects.

[0047] Without causing conflict, those skilled in the art can freely combine and use the above-mentioned additional technical features.

[0048] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by essentially the same means is within the protection scope of the present invention.

Claims

1. A TFT-LCD display module with an a-Si panel and an RGB driver IC, characterized in that: The outer frame (3) includes a detachable mounting upper frame (4) and a heat dissipation bottom frame (5); the heat dissipation bottom frame (5) is fixedly provided with a coolant tank (7) and a control box (8) on its outer side wall; the mounting upper frame (4) is detachably equipped with a protective mounting frame (2), and the protective mounting frame (2) is embedded with a TFT-LCD display module (1); a heat conduction plate (9) is fixedly installed at the bottom of the mounting upper frame (4), the upper surface of the heat conduction plate (9) abuts against the bottom of the TFT-LCD display module (1), and a number of heat sinks (11) are fixedly arranged in an array on the lower surface of the heat conduction plate (9); The heat dissipation base frame (5) has a hollow heat dissipation channel (10) inside. Heat dissipation holes (6) are provided on the periphery of the heat dissipation base frame (5). Coolant pipes (12) are arranged horizontally inside the heat dissipation channel (10). The coolant pipes (12) are fixed to the inner wall of the heat dissipation channel (10) by mounting sleeves (17). Several heat dissipation fins (11) extend downward and into the heat dissipation channel (10) at their lower ends. All heat dissipation fins (11) are sleeved on the coolant pipes (12). The bottom end of the heat dissipation fins (11) is fixedly connected to the bottom surface of the inner wall of the heat dissipation channel (10). A variable frequency speed control pump body (13) is installed inside the coolant tank (7). The variable frequency speed control pump body (13) and the coolant pipe (12) are connected end to end to form a closed coolant circulation loop. A temperature sensor (15) is installed on the inner wall of the heat dissipation channel (10). A liquid temperature probe (14) and a flow sensor (16) are installed on the coolant pipe (12). The temperature sensor (15), liquid temperature probe (14), flow sensor (16) and variable frequency speed control pump body (13) are all electrically connected to the control box (8). The control box (8) has a built-in microcontroller. The microcontroller divides the operating status of the TFT-LCD display module (1) into low-temperature working conditions for start-stop standby, medium-temperature working conditions for normal display, and high-temperature working conditions for high-load high-brightness display based on the temperature signal collected by the temperature sensor (15), and matches the gradient heat dissipation mode accordingly. In the case of low temperature, the variable frequency speed control pump body (13) is shut down, and natural air cooling is achieved by relying on the heat sink (11) and heat dissipation holes (6); Under medium and high temperature conditions, the natural air cooling structure remains unchanged. The main control microcontroller increases the output power of the variable frequency speed pump body (13) based on the collected temperature signal, increases the flow rate of the coolant inside the coolant pipe (12), thereby increasing the flow rate per unit time in the coolant pipe (12). Through liquid cooling heat exchange, the heat exchange efficiency is enhanced, and the heat dissipation energy consumption and heat dissipation efficiency are matched.

2. The TFT-LCD display module with an a-Si panel and an RGB driver IC as described in claim 1, characterized in that: The main control microcontroller has a preset first temperature threshold and a second temperature threshold, and the first temperature threshold is less than the second temperature threshold. Determination of start-stop standby working mode: The temperature sensor (15) collects the temperature T in the heat dissipation channel (10) in real time. When T < the first temperature threshold, it is determined that the TFT-LCD display module (1) is in a low temperature working condition. Determination of normal display working mode: The temperature sensor (15) collects the temperature T in the heat dissipation channel (10) in real time. When the first temperature threshold ≤ T < the second temperature threshold, the TFT-LCD display module (1) is determined to be in medium temperature condition. Determination of high load and high brightness display working mode: The temperature sensor (15) collects the temperature T in the heat dissipation channel (10) in real time. When T ≥ the second temperature threshold, the TFT-LCD display module (1) is determined to be in high temperature condition.

3. The TFT-LCD display module with an a-Si panel and an RGB driver IC as described in claim 1, characterized in that: The main control microcontroller has a built-in PID flow closed-loop control module, which includes a PID calculation module and a PID controller. In low-temperature conditions, the TFT-LCD display module (1) is in a standby state: the variable frequency speed control pump body (13) is shut down and in hibernation, and the flow sensor (16) is in standby state. In the medium-temperature working condition of the TFT-LCD display module (1): the main control microcontroller presets a constant flow rate value of the coolant at medium temperature; the flow sensor (16) collects the actual flow rate of the coolant in the coolant pipe (12) in real time and feeds it back to the PID calculation module. The PID calculation module compares the deviation between the actual flow rate and the preset constant flow rate value at medium temperature; the liquid temperature probe (14) collects the coolant temperature and sends it back to the PID calculation module; the PID calculation module judges the actual viscosity state of the coolant in combination with the real-time temperature; combining the deviation and the viscosity state of the coolant, the PID controller adjusts the power of the variable frequency speed pump (13) to compensate for the flow loss caused by the change in the viscosity of the coolant and maintain the constant actual flow rate of the coolant pipe (12); In the case of high temperature operation, the TFT-LCD display module (1) has a preset constant flow rate value for the coolant in the main control microcontroller. The actual flow rate of the coolant in the coolant pipe (12) is collected in real time by the flow sensor (16) and fed back to the PID calculation module. The PID calculation module compares the deviation between the actual flow rate and the preset constant flow rate value. The liquid temperature probe (14) collects the real-time temperature of the coolant and sends it back to the PID calculation module. The PID calculation module predicts the dynamic change trend of the coolant viscosity based on the real-time temperature of the coolant. Combining the flow deviation and the dynamic change trend of the coolant viscosity, the PID calculation module uses proportional-integral-derivative calculation to dynamically correct the output power of the variable frequency speed pump (13), offset the flow deviation caused by the viscosity fluctuation of the coolant under high temperature environment, and maintain the constant actual flow rate of the coolant pipe (12).

4. The TFT-LCD display module with an a-Si panel and an RGB driver IC as described in claim 3, characterized in that: The PID calculation module for determining coolant viscosity and compensating for flow rate under medium-temperature conditions includes the following methods: When the coolant is at a low temperature, the viscosity increases and the flow resistance increases. When the actual flow rate is lower than the set constant flow rate value at medium temperature, the PID controller automatically increases the output power of the variable frequency speed pump (13) to compensate for the flow resistance loss caused by the viscosity. When the coolant temperature rises, the viscosity decreases, and the flow resistance decreases, the actual flow rate is higher than the set constant flow rate value at medium temperature. The PID controller automatically reduces the output power of the variable frequency speed control pump body (13) to suppress the excessive flow.

5. The TFT-LCD display module with an a-Si panel and an RGB driver IC as described in claim 1, characterized in that: The TFT-LCD display module (1) includes an a-Si liquid crystal panel, a backlight module, and a driving PCB (26). The a-Si liquid crystal panel consists of an upper polarizer (18), a glass substrate (19) containing RGB color filters, a liquid crystal layer (20), an a-Si TFT array glass substrate (21), and a lower polarizer (22) from top to bottom. The RGB driving IC is integrated on the driving PCB, and the color image display is completed by the RGB color filters in conjunction with the RGB driving IC.

6. The TFT-LCD display module with an a-Si panel and an RGB driver IC according to claim 5, characterized in that: The backlight module consists of a diffuser plate (23), a backlight source (24), and a backplate (25) from top to bottom. A diffuser sheet is attached to the base surface above the diffuser plate (23). The upper polarizer (18), the glass substrate (19) containing RGB color filters, the liquid crystal layer (20), the a-Si TFT array glass substrate (21), the lower polarizer (22), the diffuser plate (23), the backlight source (24), and the backplate (25) are all connected by adhesive. The driving PCB (26) is fixedly mounted on the back side of the backplate (25).

7. The TFT-LCD display module with an a-Si panel and an RGB driver IC according to claim 1, characterized in that: The inner side of the protective mounting frame (2) is provided with a slot, and a telescopic rod (28) is provided in the slot. A flexible plate pad (27) is provided on the telescopic rod (28), and a spring (29) is provided on the outer ring of the telescopic rod (28). The two ends of the spring (29) are connected to the flexible plate pad (27) and the slot wall respectively, so as to realize the elastic limiting protection of the TFT-LCD display module (1).

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