LED display screen

Abstract

According to the LED display screen provided by the utility model, the constant current driving module is controlled by the control module so as to drive the LED module. According to the utility model, the first constant-current driving module and the second constant-current driving module are adopted, and the control chips are respectively placed in different arrangement sequences, so that the problem of non-uniform temperature caused by voltage difference in the traditional design is avoided. The red control chip, the green control chip and the blue control chip are arranged in different ways to ensure that the chips with higher temperature and the chips with lower temperature are arranged in a staggered manner, so that the temperature difference on the display screen is effectively reduced, and the occurrence of color drift is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to display screen technical field especially relates to a LED display screen. BACKGROUND

[0002] With the continuous development of LED display technology, the brightness, color performance and stability of LED display screen become the key problem in design and application. The common color drift (color drift) phenomenon of LED display screen is usually caused by the working voltage difference of different color LEDs, uneven heat distribution and other reasons. Especially in high brightness, high temperature environment, red, green and blue LEDs will produce different heat due to the difference of power supply voltage, leading to uneven temperature, and further affecting the stability and consistency of color.

[0003] The traditional LED display screen design usually adopts parallel driving mode, in this mode, the temperature distribution of each LED may be uneven due to voltage difference, especially the red LED and blue, green LED have large difference in driving voltage, leading to the temperature of part area being too high, thereby causing color drift phenomenon. In addition, in the working process of LED display screen, with the passage of time, the light decay problem of LED lamp beads will also affect the display effect, especially the light decay speed of red LED lamp beads is faster, which further aggravates the occurrence of color drift problem.

[0004] In summary, the defects existing in the prior art need to be solved. CONTENT OF THE UTILITY MODEL

[0005] The utility model provides a kind of LED display screen, to solve the defects in prior art, realize effectively reduce the temperature difference on display screen, reduce the occurrence of color drift.

[0006] The utility model provides a kind of LED display screen, comprising:

[0007] Control module, a plurality of LED modules and a plurality of constant current driving modules, an LED module is connected with a constant current driving module;

[0008] The control module is used to control the working current of the constant current driving module to drive the LED module;

[0009] The LED module includes red lamp bead, blue lamp bead and green lamp bead;

[0010] The constant current driving module comprises a first constant current driving module and a second constant current driving module, the first constant current driving module and the second constant current driving module are each provided with a first control chip, a second control chip and a third control chip, the first control chip is used for controlling the working state of the red lamp bead, the second control chip is used for controlling the working state of the blue lamp bead, and the third control chip is used for controlling the working state of the green lamp bead.

[0011] The first control chip, the second control chip and the third control chip in the first constant current driving module are arranged in a first preset order, and the first control chip, the second control chip and the third control chip in the second constant current driving module are arranged in a second preset order.

[0012] The first preset order is that the first control chip, the second control chip and the third control chip are sequentially arranged from top to bottom, and the second preset order is that the third control chip, the second control chip and the first control chip are sequentially arranged from top to bottom.

[0013] According to the LED display screen provided by the utility model, the LED module adopts common cathode packaging.

[0014] According to the LED display screen provided by the utility model, the first control chip, the second control chip and the third control chip are common cathode driving.

[0015] According to the LED display screen provided by the utility model, the LED display screen further comprises a double-voltage power supply module, the double-voltage power supply module corresponds to the constant current driving module one by one, and the double-voltage power supply module is used for providing a first voltage for the red lamp bead and a second voltage for the blue lamp bead and the green lamp bead.

[0016] According to the LED display screen provided by the utility model, the first control chip, the second control chip and the third control chip are triangularly arranged.

[0017] According to the LED display screen provided by the utility model, the LED display screen further comprises a temperature sensor, the temperature sensor is used for monitoring the working temperature of the LED display screen, and the control module is used for adjusting the working current of the constant current driving module according to the working temperature.

[0018] The LED display screen provided by the utility model, through the control module control constant current drive module, to drive the LED module. The utility model discloses by adopting first constant current drive module and second constant current drive module, places control chip respectively with different arrangement order, avoids the problem of uneven temperature caused by voltage difference in traditional design. Red, green and blue control chip adopts different arrangement mode, to ensure that the chip with higher temperature and the chip with lower temperature are staggered arrangement, thereby effectively reduce the temperature difference on the display screen, reduce the occurrence of color drift. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will be a simple introduction to the drawings needed to be used in the embodiment or the prior art description, obviously, the following description in the drawings is some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, other drawings can also be obtained according to these drawings.

[0020] Figure 1 It is the module schematic view of the LED display screen provided by the utility model;

[0021] Figure 2 It is the circuit connection diagram of the LED display screen provided by the utility model. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantage of the utility model more clear, the following will be combined with the drawings in the utility model, and the technical scheme in the utility model is clearly and completely described, obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0023] In order to solve the problem in the prior art, the utility model provides a kind of LED display screen, to realize effectively reduced the temperature difference on the display screen, reduce the occurrence of color drift. The following will be described as the LED display screen, as shown in Figure 1 Including but not limited to the following modules:

[0024] Control module, a plurality of LED modules and a plurality of constant current drive modules, the LED module and the constant current drive module one-to-one correspondence;

[0025] The control module is used to control the constant current drive module, to drive the LED module;

[0026] The LED module includes red lamp bead, blue lamp bead and green lamp bead;

[0027] The constant current drive module includes a first constant current drive module and a second constant current drive module, and the first constant current drive module and the second constant current drive module are each provided with a first control chip, a second control chip and a third control chip, the first control chip is used for controlling the red lamp bead, the second control chip is used for controlling the blue lamp bead, and the third control chip is used for controlling the green lamp bead.

[0028] The first control chip, the second control chip and the third control chip in the first constant current drive module are arranged in a first preset order, and the first control chip, the second control chip and the third control chip in the second constant current drive module are arranged in a second preset order.

[0029] Specifically:

[0030] The main function of the control module is to ensure that the LED module can run in the best state by real-time monitoring and controlling the working state of each constant current drive module. The control module usually includes a microprocessor, a storage module, an input / output interface, a temperature sensor and other auxiliary components. The control module interacts with the constant current drive module through signal transmission, adjusts the driving current to maintain the stability of the display effect.

[0031] Each LED module includes red, green and blue lamp beads. Each lamp bead is provided with current by the constant current drive module when working to ensure stable light emission and obtain high brightness output. The LED module adopts common cathode packaging, and the cathodes of each LED lamp bead are connected together, facilitating control and unified management of current.

[0032] The application uses two constant current drive modules: a first constant current drive module and a second constant current drive module. Each constant current drive module includes three control chips:

[0033] The first control chip is used for controlling the current of the red lamp bead.

[0034] The second control chip is used for controlling the current of the blue lamp bead.

[0035] The third control chip is used for controlling the current of the green lamp bead.

[0036] The function of these chips is to provide precise current control to ensure the stability of the light intensity of each lamp bead and prevent excessive brightness or insufficient brightness, thereby ensuring the accuracy of the display effect.

[0037] In the implementation process, the chip arrangement order in the constant current drive module is crucial, which directly affects the thermal management and color stability of the LED display screen. The three control chips in the first constant current drive module are arranged in a first preset order. The order is: the first control chip, the second control chip, and the third control chip are arranged from top to bottom in turn. The design of this order helps to effectively manage and balance the heat distribution of each area of the LED display screen, avoiding uneven display caused by temperature difference when the chip is working. The three control chips in the second constant current drive module are arranged in a second preset order. The order is: the third control chip, the second control chip, and the first control chip are arranged from top to bottom in turn. By interleaving the red, green, and blue control chips, the heat distribution inside the display screen is further balanced, avoiding color drift phenomenon in some areas due to high temperature.

[0038] The specific working principle is as follows:

[0039] The control module controls the working state of the constant current drive module according to the preset display content and temperature monitoring information. The control module adjusts the current in the constant current drive module through the output signal to ensure the luminous intensity and color accuracy of each LED module.

[0040] Due to the reasonable arrangement order of the chips in the LED modules and the constant current drive modules in the LED display screen, the heat can be evenly distributed, avoiding the color drift phenomenon caused by local high temperature. At the same time, the voltage difference between the red LED lamp beads and the blue and green LED lamp beads is optimized, reducing the temperature difference between the LED lamp beads, further improving the stability of the display effect.

[0041] The temperature sensor monitors the working temperature of the LED display screen in real time. When the temperature of the display screen changes, the control module adjusts the current output of the constant current drive module according to the monitored temperature data to avoid the negative impact of high temperature on the display effect.

[0042] Through the above design, the LED display screen can maintain low temperature rise and stable color output in the environment of high brightness and long time work. The control chips of red, green, and blue lamp beads are reasonably arranged to avoid the problem of uneven display caused by large temperature difference. In addition, the addition of double voltage power supply and temperature monitoring system makes the LED display screen more energy-saving and has better color consistency and stability.

[0043] As a further optional embodiment, the first preset order is the first control chip, the second control chip, and the third control chip from top to bottom in turn, and the second preset order is the third control chip, the second control chip, and the first control chip from top to bottom in turn.

[0044] Reference Figure 2In this embodiment, the control chip arrangement order in the first constant current drive module and the second constant current drive module can be adjusted according to different requirements to optimize heat management and display effect. Specifically:

[0045] The control chip arrangement order of the first constant current drive module: the three control chips in the first constant current drive module are arranged in a first preset order. The order is arranged from top to bottom as follows:

[0046] The first control chip (controls the current of the red light bead),

[0047] The second control chip (controls the current of the blue light bead),

[0048] The third control chip (controls the current of the green light bead).

[0049] This arrangement can ensure that the working temperatures of the red, blue and green light bead control chips are evenly distributed, thereby effectively avoiding color drift phenomenon caused by temperature difference and ensuring stable display effect of the display screen.

[0050] The control chip arrangement order of the second constant current drive module: the three control chips in the second constant current drive module are arranged in a second preset order. The order is arranged from top to bottom as follows:

[0051] The third control chip (controls the current of the green light bead),

[0052] The second control chip (controls the current of the blue light bead),

[0053] The first control chip (controls the current of the red light bead).

[0054] By alternately arranging the red, green and blue control chips, balanced heat distribution can be achieved on the LED display screen in different areas, reducing the temperature difference caused by local high temperature rise, thereby further stabilizing the color and improving the consistency of the display effect.

[0055] The design of this alternative embodiment provides a flexible chip arrangement method, which can be adjusted according to specific engineering requirements or working environment to optimize the performance of the LED display screen.

[0056] As a further optional embodiment, the LED module adopts common cathode packaging.

[0057] In this embodiment, the packaging method of the LED module adopts common cathode packaging, which is as follows:

[0058] Common Cathode Package: The red, blue, and green LED beads in the LED module all adopt a common cathode package structure, that is, the cathode terminals of each LED bead are connected together to the power supply ground (negative pole), while the anode terminals of each LED bead are respectively connected to the control chips in the constant current driving module. By controlling the anode terminal current of each LED bead, its brightness and display effect can be controlled.

[0059] The common cathode package has the following advantages:

[0060] Reduced circuit complexity: The common cathode package simplifies the circuit design, as it does not require separate negative pole control for each LED bead, thus reducing the number of wires and connection points in the circuit, thereby reducing the complexity of PCB design.

[0061] Improved heat management: Since the cathode terminals of all LED beads are connected together, the current can return through a single power supply ground, making the current distribution in the system more uniform, which is beneficial for improving heat distribution, reducing local overheating, and reducing the temperature difference and color drift phenomenon of the display screen.

[0062] Improved stability and reliability: The common cathode package makes the LED module more stable during long-term operation, effectively reducing the problem of LED bead color deviation and brightness unevenness caused by voltage and current fluctuations.

[0063] Higher compatibility: The common cathode package has higher compatibility in practical applications, especially suitable for display screens that need to be uniformly powered and controlled among multiple LED modules, simplifying design and maintenance.

[0064] As a further optional embodiment, the first control chip, the second control chip, and the third control chip are all common cathode driven.

[0065] In this embodiment, the first control chip, the second control chip, and the third control chip all adopt common cathode driving, specifically as follows:

[0066] Common Cathode Driving: Common cathode driving means that the cathode terminal of each control chip is connected to the ground (negative pole), while its anode terminal drives the corresponding LED beads (red, blue, and green) through constant current control. Each control chip individually controls the current of the corresponding LED bead, adjusting the brightness and display effect of the LED bead by adjusting the current size.

[0067] By adopting common cathode driving, this embodiment not only optimizes current control and circuit design, but also improves the stability and heat management effect of the LED display screen, thereby ensuring excellent performance and longer service life of the display screen during long-term use.

[0068] As a further optional embodiment, the LED display screen further comprises a dual-voltage power supply module, which corresponds to the constant current driving module one-to-one, and is used to provide a first voltage for the red light beads and a second voltage for the blue and green light beads.

[0069] In this embodiment, the LED display screen includes a dual-voltage power supply module corresponding to each constant current driving module, which is configured as follows:

[0070] This module provides the required power supply for LED light beads of different colors through two different voltages. Specifically:

[0071] The first voltage (e.g. 2.8V) is provided for red light beads to meet the working requirements of red LED light beads.

[0072] The second voltage (e.g. 3.8V) is provided for blue and green light beads to meet the working requirements of blue and green LED light beads.

[0073] Working principle of dual-voltage power supply module

[0074] Red light beads: Since the working voltage of red LED light beads is relatively low, generally around 2.8V, the dual-voltage power supply module provides a first voltage for them to avoid waste of electrical energy and accumulation of heat caused by excessive voltage.

[0075] Blue and green light beads: Blue and green LED light beads usually require a higher working voltage, approximately 3.8V, so the dual-voltage power supply module provides a second voltage for these two types of light beads to ensure they operate in an optimal state.

[0076] Advantages of dual-voltage power supply module

[0077] The dual-voltage power supply module provides precise voltage according to the actual needs of different color light beads, avoiding the voltage waste and energy loss that may occur in traditional solutions using a single voltage supply. By precisely controlling the voltage, the energy utilization efficiency of the entire display screen can be improved, reducing unnecessary heat generation.

[0078] By providing matching voltages for light beads of different colors, it can ensure that each color of light bead works under the best voltage condition, thereby improving the stability of the display effect and avoiding problems such as uneven brightness and color deviation caused by mismatched voltage.

[0079] Since each color of LED light bead can obtain precise working voltage, unnecessary energy loss and heat accumulation are reduced. Especially in high-brightness display screens, reasonable voltage supply can effectively reduce local overheating, reduce thermal damage, and prolong the service life of the LED display screen.

[0080] The design of the dual-voltage power supply module can ensure more uniform voltage distribution of the entire LED display screen, avoid system instability caused by voltage mismatch, and improve the reliability and stability of the LED display screen in different working environments.

[0081] Through the integrated design of the dual-voltage power supply module, additional power management modules can be reduced, and the circuit layout can be simplified. Compared with the traditional voltage division power supply scheme, the dual-voltage power supply module provides a more concise and efficient solution.

[0082] As a further optional embodiment, the first control chip, the second control chip, and the third control chip are arranged in a triangular layout.

[0083] Reference Figure 2 In this embodiment, the first control chip, the second control chip, and the third control chip are arranged in a triangular layout. The specific configuration is as follows:

[0084] The control chips (including the first control chip, the second control chip, and the third control chip) are arranged in a triangular manner on the PCB (printed circuit board) of the LED display screen. This layout makes the three control chips present an equilateral triangle shape in physical space, respectively used to control LED beads of different colors (red, blue, and green).

[0085] Due to the characteristics of the triangular layout, the spacing between the chips is relatively uniform, avoiding heat concentration in a certain area. The position of each chip relative to other chips is relatively symmetrical, ensuring that heat can be evenly dispersed, which helps to improve the heat dissipation performance of the entire LED display screen and reduce temperature differences and color drift caused by overheating of the chips.

[0086] In the traditional layout, the chips are often arranged in a linear manner, resulting in more heat near some chips, which may affect the stability of the surrounding chips. The triangular layout ensures that the chips are relatively independent through reasonable space allocation, reducing the negative impact of temperature on other chips, thereby improving the stability and reliability of the system.

[0087] As a further optional embodiment, the LED display screen further includes a temperature sensor for monitoring the working temperature of the LED display screen, and the control module is configured to adjust the working current of the constant current driving module according to the working temperature.

[0088] In this embodiment, the LED display screen is configured with a temperature sensor, which mainly functions to monitor the working temperature of the LED display screen in real time. The specific implementation is as follows:

[0089] The temperature sensor can be arranged at key positions of the LED display screen, especially in the peripheral area of the LED module, or near the constant current driving module, to ensure accurate sensing of the overall working temperature and local temperature change of the screen body.

[0090] The temperature sensor can collect the working temperature of the LED display screen in real time and feed back the temperature data to the control module. The control module makes corresponding adjustments based on the received temperature data.

[0091] According to the real-time temperature of the display screen, the control module dynamically adjusts the working current of the constant current driving module to ensure that the temperature does not exceed the preset safety range. When the temperature is high, the control module can appropriately reduce the current to reduce the heat generation of the chip; when the temperature is normal, it can return to the standard current value to ensure the display effect and system stability.

[0092] By configuring the dynamic temperature control adjustment system of the temperature sensor and the control module, the embodiment can monitor the working temperature of the LED display screen in real time and adjust the working current of the constant current driving module according to the temperature change, to ensure that the LED display screen can automatically reduce the current when the temperature is too high to prevent overheating. This not only effectively improves the stability, reliability and energy efficiency of the LED display screen, but also helps to prolong the service life of the equipment and ensure that the system can maintain optimal performance under different environmental conditions.

[0093] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An LED display screen, characterized in that, The application relates to an LED display screen. The LED display screen comprises a control module, a plurality of LED modules and a plurality of constant-current driving modules, one LED module is connected with one constant-current driving module; the control module is used for controlling the working current of the constant-current driving module to drive the LED module; the LED module comprises red lamp beads, blue lamp beads and green lamp beads; the constant-current driving module comprises a first constant-current driving module and a second constant-current driving module, the first constant-current driving module and the second constant-current driving module are each provided with a first control chip, a second control chip and a third control chip, the first control chip is used for controlling the working state of the red lamp beads, the second control chip is used for controlling the working state of the blue lamp beads, and the third control chip is used for controlling the working state of the green lamp beads; the first control chip, the second control chip and the third control chip in the first constant-current driving module are arranged in a first preset sequence, and the first control chip, the second control chip and the third control chip in the second constant-current driving module are arranged in a second preset sequence; wherein the first preset sequence is that the first control chip, the second control chip and the third control chip are sequentially arranged from top to bottom, and the second preset sequence is that the third control chip, the second control chip and the first control chip are sequentially arranged from top to bottom.

2. The LED display screen of claim 1, wherein, The LED module adopts common cathode packaging.

3. The LED display screen of claim 1, wherein, The first control chip, the second control chip and the third control chip are all common cathode driving.

4. The LED display screen of claim 1, wherein, The LED display screen further comprises a double-voltage power supply module, the double-voltage power supply module corresponds to the constant-current driving module one by one, and the double-voltage power supply module is used for providing a first voltage for the red lamp beads and a second voltage for the blue lamp beads and the green lamp beads.

5. The LED display screen of claim 1, wherein, The first control chip, the second control chip and the third control chip are arranged in a triangular shape.

6. The LED display screen of claim 1, wherein, The LED display screen further comprises a temperature sensor, the temperature sensor is used for monitoring the working temperature of the LED display screen, and the control module is used for adjusting the working current of the constant-current driving module according to the working temperature.

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