Display module, control method thereof, and display device

Abstract

In a display module, a control method thereof, and a display device provided by the present application, the display module includes a lamp board, a plurality of temperature detection modules, a temperature acquisition module, and a control module. Among them, the lamp board is provided with a plurality of lamp beads, and the lamp board is divided into a plurality of lamp areas. The plurality of temperature detection modules are arranged in one-to-one correspondence with the plurality of lamp areas. The temperature acquisition module is connected to the plurality of temperature detection modules and is used to acquire the temperature parameters of the corresponding lamp areas detected by each temperature detection module. If the temperature parameter of any lamp area acquired by the control module is greater than a preset threshold, at least the current corresponding to the first range of gray levels of the lamp beads in the lamp area where the temperature parameter is greater than the preset threshold is reduced, so as to reduce the heat generation of the lamp beads in the high-temperature lamp area, and further avoid the problem that the lamp beads in this lamp area affect the optoelectronic characteristics and lifespan of the lamp beads due to excessive temperature.

Description

Technical Field

[0001] The present application relates to the field of displays, and in particular, to a display module, a control method thereof, and a display device. Background Art

[0002] In related technologies, more and more display products use a Mini-LED light board as a light-emitting module or a backlight module. Taking the Mini-LED light board as a backlight module as an example, the Mini-LED adopts a direct-lit and small-pitch lamp bead design, and realizes area dimming within a smaller range through a large number of dense arrangements. Compared with the traditional side-backlight design, it can have better brightness uniformity and higher color contrast within a smaller light mixing distance, can realize the ultra-thin design of terminal products, and save electric energy.

[0003] However, the LED lamp beads in the Mini-LED backlight are greatly affected by temperature, and temperature plays a crucial role in the photoelectric characteristics and lifespan of the LED lamp beads. Therefore, how to avoid the Mini-LED backlight from affecting the photoelectric characteristics and lifespan of the LED lamp beads due to too high temperature is an urgent problem to be solved. Summary of the Invention

[0004] To solve the above problems, the present application provides a display module, a control method thereof, and a display device, which can avoid the problem that the Mini-LED affects the photoelectric characteristics and lifespan of the LED lamp beads due to too high temperature.

[0005] To solve the above problems, the first technical solution provided by the present application is: to provide a display module, including:

[0006] A light board, on which there are a plurality of lamp beads, and the light board is divided into a plurality of lamp areas;

[0007] A plurality of temperature detection modules, which are arranged in one-to-one correspondence with the plurality of lamp areas;

[0008] A temperature acquisition module, connected to the plurality of temperature detection modules, and used to acquire the temperature parameters of the corresponding lamp areas detected by each of the temperature detection modules;

[0009] A control module, connected to the plurality of lamp beads, the plurality of temperature detection modules, and the temperature acquisition module, the control module is used to control the plurality of lamp beads, the plurality of temperature detection modules, and the temperature acquisition module to work, and if the control module determines that the temperature parameter of any one of the lamp areas acquired by the temperature acquisition module is greater than a preset threshold, at least reduce the current corresponding to the first range of gray levels of the lamp beads in the lamp area where the temperature parameter is greater than the preset threshold.

[0010] In one embodiment, the first range of gray levels is 160 gray levels - 255 gray levels.

[0011] In one embodiment, each of the temperature detection modules includes a first transistor and a grounding resistor. The control terminal of the first transistor is connected to the control module. The first path terminal of the first transistor is connected to a voltage source. The second path terminal of the first transistor, the first terminal of the grounding resistor, and the temperature detection module are connected at a first node, and the second terminal of the grounding resistor is grounded;

[0012] When the control module controls the first transistor to be in a conducting state, the temperature detection module detects the voltage at the first node.

[0013] In one embodiment, each of the light zones includes multiple groups of lamp strings. Each group of lamp strings includes multiple serially connected lamp beads, and each group of lamp strings is also connected to the voltage source;

[0014] In each of the light zones, the temperature detection module is connected in parallel with each group of lamp strings. Among them, the control module is used to control the first transistor corresponding to the light zone to be in a conducting state when the light zone is in a non-operating state.

[0015] In one embodiment, the temperature acquisition module includes: a logic control unit, a shift register, and multiple second transistors; the first path terminal of each second transistor is connected to one of the first nodes, the control terminal of each second transistor is connected to the shift register, and the second path terminal of each second transistor is connected to the logic control unit;

[0016] Among them, when the shift register controls the second transistor to be in a conducting state, the voltage at the first node connected to the conducting second transistor is fed back to the logic control unit through the second transistor, and the logic control unit further converts the voltage at the first node into the temperature parameter of the corresponding light zone.

[0017] In one embodiment, the shift register includes multiple D flip-flops, and the multiple D flip-flops are connected to the multiple second transistors in a one-to-one correspondence;

[0018] Among them, the data input terminal of each D flip-flop is connected to the control module to receive the acquisition signal sent by the control module, the clock input terminal of each D flip-flop is connected to the control module to receive the clock signal sent by the control module, and the in-phase output terminal of each D flip-flop is connected to the data input terminal of the next adjacent D flip-flop and the control terminal of the corresponding second transistor.

[0019] In one embodiment, each of the temperature detection modules includes a temperature sensor.

[0020] In one embodiment, when the temperature parameter of any one of the lamp areas collected by the temperature acquisition module is greater than a preset threshold, the control module further reduces at least the duty ratio of the light-emitting time of the lamp beads in the lamp area where the temperature parameter is greater than the preset threshold.

[0021] To solve the above problems, the second technical solution provided by this application is: to provide a display device, and the display device includes the display module described in any one of the above.

[0022] To solve the above problems, the third technical solution provided by this application is: to provide a control method for a display module, including a lamp board, where the lamp board has a plurality of lamp beads, and the lamp board is divided into a plurality of lamp areas, including:

[0023] When the lamp area is in a non-working state, control the temperature detection module corresponding to the lamp area to work, and collect the temperature parameter of the corresponding lamp area detected by each temperature detection module through the temperature acquisition module;

[0024] Based on the fact that the temperature parameter of any one of the lamp areas collected by the temperature acquisition module is greater than a preset threshold, at least reduce the current corresponding to the first range of gray levels of the lamp beads in the lamp area where the temperature parameter is greater than the preset threshold.

[0025] The beneficial effect of this application is that, different from the prior art, in the display module, its control method, and the display device provided by this application, the display module includes a lamp board, a plurality of temperature detection modules, a temperature acquisition module, and a control module. Among them, the lamp board has a plurality of lamp beads, and the lamp board is divided into a plurality of lamp areas. The plurality of temperature detection modules are arranged in one-to-one correspondence with the plurality of lamp areas. The temperature acquisition module is connected to the plurality of temperature detection modules and is used to collect the temperature parameters of the corresponding lamp areas detected by each temperature detection module. When the temperature parameter of any one of the lamp areas collected by the control module is greater than a preset threshold, at least reduce the current corresponding to the first range of gray levels of the lamp beads in the lamp area where the temperature parameter is greater than the preset threshold, thereby reducing the heat generation of the lamp beads in the high-temperature lamp area, and further avoiding the problem that the lamp beads are affected by the photoelectric characteristics and lifespan due to too high temperature. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where:

[0027] Figure 1 It is a schematic diagram of the temperature and lifespan of LED lamp beads;

[0028] Figure 2 It is a module schematic diagram of the display module provided by the embodiment of the present application;

[0029] Figure 3 It is a circuit structure diagram of the temperature detection module and the temperature acquisition module provided by the embodiment of the present application;

[0030] Figure 4 It is a circuit structure diagram and a timing diagram of the shift register provided by the embodiment of the present application;

[0031] Figure 5 It is a waveform comparison diagram of the initial PWM dimming and the adjusted PWM dimming provided by the embodiment of the present application;

[0032] Figure 6 It is a structure schematic diagram of the lamp board, the source driver unit and the gate driver unit provided by the embodiment of the present application;

[0033] Figure 7 It is a curve graph of the first transistor changing with temperature provided by the embodiment of the present application;

[0034] Figure 8 It is a relationship diagram between the voltage of the first node and temperature provided by the embodiment of the present application;

[0035] Figure 9 It is a flow schematic diagram of the control method of the display module provided by an embodiment of the present application;

[0036] Figure 10 It is a flow schematic diagram of the control method of the display module provided by another embodiment of the present application;

[0037] Figure 11 It is a structure schematic diagram of the display device provided by an embodiment of the present application.

[0038] Label description:

[0039] Display module 100; Lamp board 10; Lamp string 11; Temperature detection module 20; First transistor T1; Grounding resistor R; Temperature acquisition module 30; Logic control module 31; Shift register 32; D flip-flop 321; Second transistor T2; Control module 40; Source driver unit 41; Gate driver unit 42

[0040] Lamp area A; First lamp area A1; Second lamp area A2; Third lamp area A3; Voltage source VIN; First node n1. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0042] The terms "first", "second", "third", etc. in the present application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include at least one of such features.

[0043] Referring to "embodiment" herein means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0044] Taking the Mini-LED light board as the backlight module as an example, the LED lamp beads in the Mini-LED light board are greatly affected by temperature. Temperature plays a crucial role in the optoelectronic characteristics and lifespan of the LED lamp beads. Refer to Figure 1 , Figure 1 which is a schematic diagram of the temperature and lifespan of the LED lamp beads. The abscissa is the number of hours the LED lamp beads emit light, and the ordinate is the luminous flux of the lamp beads (representing the brightness value). Different temperatures correspond to different curves. This figure can reflect the direct relationship between temperature, brightness, and lifespan. It can be seen that the higher the temperature, the shorter the lifespan of the LED lamp beads and the faster the attenuation. Too high a temperature will seriously affect the lifespan and luminous brightness of the LED.

[0045] Moreover, the inventor also found that an increase in temperature may not only bring problems such as a shortened lifespan of the LED lamp beads, but also may cause the temperature of the Mini-LED light board to rise rapidly. Since the heat generated by the light board cannot be dissipated in time, the light board is in a high-temperature state, resulting in the thermal expansion of the light board. Due to the thermal expansion rate of the protective glue being greater than that of the light board substrate material, a slight displacement will occur between the light board substrate and the protective glue, causing the chip to be subjected to the extrusion thrust of the protective glue. When the thrust on the chip reaches a certain intensity, the solder between the chip and the light board substrate will crack, resulting in the electrical connection failure between the light-emitting chip and the pad and the phenomenon of the lamp going out.

[0046] In addition, the influence of too high a temperature on the LED is as follows:

[0047] 1. Accelerate the aging of the light-emitting channel material;

[0048] 2. Reduce the light transmittance of the channel material;

[0049] 3. Change the refractive index of the light-emitting channel material, affecting the spatial distribution of light;

[0050] 4. Seriously change the structure of the light-emitting channel.

[0051] See Figures 2 - 4 , Figure 2 which is a schematic diagram of the modules of the display module provided in the embodiment of the present application; Figure 3 which is a circuit structure diagram of the temperature detection module and the temperature acquisition module provided in the embodiment of the present application; Figure 4 which is a circuit structure diagram and a timing diagram of the shift register provided in the embodiment of the present application.

[0052] To solve the above problems, the present application provides a display module 100, which includes a lamp board 10, a plurality of temperature detection modules 20, a temperature acquisition module 30, and a control module 40.

[0053] Among them, the lamp board 10 has a plurality of lamp beads (not labeled in the figure), and the lamp board 10 is divided into a plurality of lamp areas A. Among them, the present application takes the lamp board 10 as a Mini-LED lamp board and the lamp beads as LED lamp beads as an example for illustration.

[0054] Specifically, the Mini-LED lamp board 10 can accommodate more LED lamp beads per unit area, thus greatly increasing the number of backlight sources. Therefore, a design for regional brightness adjustment can be carried out, so that the LEDs can be turned off in individual areas to achieve complete black, which not only reduces power consumption, but also due to the increase in the number of LEDs per unit area, realizes ultra-high contrast and fine dynamic distribution, making the bright field brighter and the dark field darker, thus making the display effect more delicate. In addition, the Mini-LED backlight can be combined with the Local Dimming technology to control the on / off and brightness adjustment of the corresponding backlight area in real time according to the bright and dark fields of each part of the picture in the signal, making the black in the picture blacker, the white whiter, the colors more natural and vivid, and bringing the best immersive experience with a realistic sense of vision.

[0055] Among them, the plurality of temperature detection modules 20 are arranged in one-to-one correspondence with the plurality of lamp areas A. Specifically, compared with the prior art in which only one temperature detection module is provided on the entire lamp board, or a plurality of lamp areas share one temperature detection module, the present application can improve the fineness and control degree of the temperature detection of the entire lamp board 10 by arranging a temperature detection module 20 corresponding to each lamp area A, and can accurately locate the overheated lamp area A for subsequent processing.

[0056] Among them, the temperature acquisition module 30 is connected to multiple temperature detection modules 20, and is used to acquire the temperature parameters of the corresponding lamp area A detected by each temperature detection module 20.

[0057] Among them, the control module 40 is connected to multiple lamp beads, multiple temperature detection modules 20, and the temperature acquisition module 30. The control module 40 is used to control the operation of the multiple lamp beads, multiple temperature detection modules 20, and the temperature acquisition module 30. In this application, when the temperature parameter of any lamp area A collected by the temperature acquisition module 30 is greater than the preset threshold, the control module 40 at least reduces the current corresponding to the first range of gray levels of the lamp beads in the lamp area A where the temperature parameter is greater than the preset threshold.

[0058] Among them, the preset threshold can be determined through experiments. For example, the temperature that affects the optoelectronic characteristics and lifespan of the lamp beads is determined as the reference value through experiments. For example, the preset threshold can be 65°C, 75°C, etc., and is not limited here.

[0059] Specifically, since the lamp beads on the lamp board 10 change with the display screen, the average temperature of each lamp area A within a period of time is collected (the temperature will not change suddenly). When the temperature of a certain lamp area A is too high, it indicates that this lamp area A has been working at a high load, with a large current and high brightness. Moreover, temperature affects the luminous efficiency of the lamp beads (the luminous efficiency becomes lower at high temperatures), and the change in luminous efficiency will affect the luminous uniformity of the entire backlight. Then, different temperatures in each lamp area A will cause uneven light output of the entire display module 100. And long-term high temperature will affect the luminous lifespan of the lamp beads. At this time, measures need to be taken for these high-temperature lamp areas A.

[0060] It can be understood that in the first embodiment of this application, reducing the current corresponding to each gray level within the first range can correspondingly reduce the heat generated by each gray level within the first range per unit time, thereby avoiding the problem that the optoelectronic characteristics and lifespan of the lamp beads are affected due to excessive temperature.

[0061] Among them, the first range of gray levels can be 0-255 gray levels. In this scenario, the overall brightness of the entire display module 100 will decrease to some extent, but the problem that the optoelectronic characteristics and lifespan of the lamp beads are affected by high temperature can be avoided.

[0062] It should be noted that due to the Gamma effect of the human eye, the human eye is less sensitive to high light intensity. Therefore, in some embodiments, the first range of gray levels is high gray levels, such as 160 gray levels - 255 gray levels. Specifically, when the gray level is above 160, the human eye is less sensitive to the change in brightness. Therefore, even if the brightness corresponding to the first range of gray levels decreases due to the reduction of the current corresponding to the first range of gray levels, the human eye will not observe a large difference in brightness sensually, so it will not affect the user's viewing experience. When the gray level is below 160, since the corresponding current is generally small, the heat generated by the lamp beads is not large itself, so current adjustment is not required.

[0063] In addition, when the display module 100 is applied as a backlight module, since the backlight module mainly emits white light, the control module 40 reduces at least the current corresponding to the first range of gray levels of the lamp beads in the lamp area A where the temperature parameter is greater than the preset threshold. Compared with reducing the gray level current when the display module 100 is applied as a light-emitting module, there will be no problem of color drift of the display device applying the display module 100.

[0064] In one embodiment, when the temperature parameter of any lamp area A collected by the temperature acquisition module 30 is greater than the preset threshold, the control module 40 reduces the current corresponding to the first range of gray levels of the lamp beads in the lamp area A where the temperature parameter is greater than the preset threshold, thereby avoiding the problem that the high-temperature lamp area A is in a high-temperature environment for a long time and affects the optoelectronic characteristics and lifespan of the lamp beads in the lamp area A.

[0065] In another embodiment, when the temperature parameter of any lamp area A collected by the temperature acquisition module 30 is greater than the preset threshold, the control module 40 reduces the current corresponding to the first range of gray levels of the lamp beads in each lamp area A, thereby avoiding the problem that the high-temperature lamp area A is in a high-temperature environment for a long time and affects the optoelectronic characteristics and lifespan of the lamp beads in the lamp area A. It can be understood that compared with only reducing the current corresponding to the first range of gray levels of the lamp beads in the high-temperature lamp area A, the current corresponding to the first range of gray levels of all the lamp beads on the entire lamp board 10 is uniformly reduced, so that the light output of any light-emitting area of the entire display module 100 is the same, further reducing the brightness difference sensually perceived by the human eye at high gray levels.

[0066] Taking the current corresponding to the initial setting of 255 gray levels as 20 mA as an example, if the temperature parameter of any lamp area A collected by the temperature acquisition module 30 is greater than the preset threshold, the control module 40 reduces the current corresponding to all the lamp beads on the entire lamp board 10 at 255 gray levels to 15 mA, or even 10 mA, thereby reducing the heat generated by the lamp beads per unit time at 255 gray levels.

[0067] In the second embodiment of the present application, the control module 40 controls the multiple lamp beads in a PWM (Pulse Width Modulation) dimming manner. And when the temperature parameter of any lamp area A collected by the temperature acquisition module 30 is greater than a preset threshold, the control module 40 further reduces at least the duty ratio of the light-emitting time of the lamp beads in the lamp area A where the temperature parameter is greater than the preset threshold.

[0068] Specifically, since the lamp beads adopt PWM dimming, that is, the light-emitting time is not continuous but on for a period of time and off for a period of time, which can also save electricity and power. Combining Figure 3 and Figure 5 , Figure 5 is a waveform comparison diagram of the initial PWM dimming and the adjusted PWM dimming provided by the embodiment of the present application. The lamp beads in the first lamp area A1, the second lamp area A2, and the third lamp area A3 (taking LED1, LED2, and LED3 as examples respectively) have the same on time under normal circumstances, and the different brightness is only determined by the different currents. As long as the frequency is not within the human eye flicker frequency range, the off time is invisible. However, the on current light-emitting time will directly determine the heat amount of the lamp beads.

[0069] See Formulas (1) and (2):

[0070]

[0071] P(t) = I2(t)R dson ; Formula (2)

[0072] Where Q is the heat generated by the lamp beads within the unit time from 0 to t1, P(t) is the heating power of the lamp beads, I is the current flowing through the lamp beads, and R dson is the on-resistance of the lamp beads. This part of the power will be completely converted into heat Q. Then it can be understood that to control the temperature of the lamp beads, either the current flowing through the lamp beads or the light-emitting time of the lamp beads can be controlled. However, the current flowing through the lamp beads will directly determine the brightness of the lamp beads. Therefore, the light-emitting time of the lamp beads can be controlled.

[0073] Taking the third lamp area A3 as an example of a high-temperature lamp area, as Figure 5 , for the lamp area A with high temperature, change the PWM dimming method. First, through the collected thermometer, detect the lamp area A with abnormal temperature (high temperature). After selecting the abnormal lamp area A, change the light-emitting time of the abnormal lamp area A to make the off time longer. In this way, less heat can be dissipated, and the longer off time means the longer heat dissipation time, thereby reducing the temperature of the lamp area A with abnormal temperature.

[0074] It should be noted that for the adjustment of the duty cycle, it cannot exceed the range of flicker visible to the human eye, otherwise the flicker phenomenon of the backlight will be seen. Taking the lowest flicker frequency as the boundary, the maximum flicker time T within a period is obtained, and the adjustment range can only be within this time T. For example, if the time T is divided into 50 equal parts (if the refresh rate is higher, it can be divided more roughly), if the temperature is only slightly higher than the temperature of the surrounding other lamp area A, then it can be reduced one gear at a time until it is close to the temperature of the surrounding lamp area A; if the temperature difference from the surrounding lamp area A is large, it can be reduced by 10 gears, 20 gears, etc. first, and then fine-tuned one gear at a time. The adjustment procedure is as follows: after the temperature acquisition module 30 reads the temperatures of each lamp area A, the control module 40 determines the area with abnormal temperature, and then adjusts the PWM waveform output by the LED driver of the corresponding lamp area A, and then detects the temperature through the temperature acquisition module 30 until the optimal solution is adjusted. This is a process of gradual adjustment and matching, and also a process of dynamically maintaining balance.

[0075] In some embodiments, multiple lamp beads in each lamp area A can be independently set (not shown in the figure), or refer to Figure 2 , each lamp area A includes multiple groups of lamp strings 11, and each group of lamp strings 11 includes multiple serially connected lamp beads, which is not limited herein. For ease of description, this application takes each lamp area A including multiple groups of lamp strings 11 as an example for illustration.

[0076] Among them, the control module 40 further includes multiple constant current control chips (not shown in the figure). Each constant current control chip is set corresponding to a lamp area A, and each constant current driving chip has multiple control channels for controlling the current magnitude of each lamp string 11. Since each lamp string 11 is composed of multiple LED lamp beads connected in series, their currents are the same and the brightness is the same. The magnitude of the current determines the gray scale (brightness) value of the lamp string 11.

[0077] Among them, refer to Figure 6 , Figure 6 is a schematic structural diagram of the lamp board, source driver unit and gate driver unit provided by the embodiment of the present application. The control module 40 further includes a source driver unit 41, a gate driver unit 42 and a driving circuit (not shown in the figure). The source driver unit 41 and the gate driver unit 42 drive each lamp string 11 to work through the driving circuit connected to each lamp string 11. Specifically, the structures and functions of the source driver unit 41, the gate driver unit 42 and the driving circuit are prior arts and will not be elaborated herein.

[0078] In one embodiment, the temperature detection module 20 includes a temperature sensor, such as a digital sensor, a thermosensor, a resistance temperature detector, a platinum resistance thermometer, etc.

[0079] In another embodiment, please refer to Figure 3, each temperature detection module 20 includes a first transistor T1 and a grounding resistor R. The control terminal of the first transistor T1 is connected to the control module 40. The first path terminal of the first transistor T1 is connected to the voltage source VIN. The second path terminal of the first transistor T1, the first terminal of the grounding resistor R, and the temperature detection module 20 are connected at the first node n1, and the second terminal of the grounding resistor R is grounded. Among them, when the control module 40 controls the first transistor T1 to be in the conducting state, the temperature detection module 20 detects the voltage at the first node n1.

[0080] Specifically, this application uses the change in the temperature perception of the first transistor T1 to collect the ambient temperature of the lamp area A. As Figure 7 shown, Figure 7 is the curve graph of the first transistor provided by this application changing with temperature. In the figure, the abscissa is the VGS voltage of the first transistor T1, the ordinate is the IDS current, the gray line is the result of the I / V curve of the first transistor T1 drifting after the temperature rises, and the black line is the I / V curve of the first transistor T1 at room temperature.

[0081] It can be seen that when the abscissa VGS is the voltage Voff1, the first transistor T1 at room temperature can be completely turned off, and the leakage current is almost zero. However, for the first transistor T1 at high temperature, because the curve drifts to the left, its turn-off voltage also drifts. At the same turn-off voltage, a leakage current IDS1 will be generated at this time. Therefore, the change in temperature can be judged according to the change in the leakage current of IDS due to different temperatures, and the temperature of the lamp area A where the first transistor T1 is located can be obtained.

[0082] Combined with Figure 7 and Figure 8 , Figure 8 is the relationship graph between the voltage and temperature of the first node provided by the embodiment of this application. Specifically, under the condition of the Voff voltage, the temperature acquisition module 30 acquires different IDS currents corresponding to different temperatures at the first node n1, and converts them into different voltages through the grounding resistor R. When the temperature rises, the corresponding leakage current is IDS1. After being converted by the grounding resistor R, the acquisition voltage of V1 is obtained and fed back to the temperature acquisition module 30, and the corresponding temperature parameter is obtained as 40°C.

[0083] Among them, each temperature detection module 20 can be connected to a group of lamp strings 11 in the corresponding lamp area A; or, each temperature detection module 20 can be connected to multiple groups of lamp strings 11 in the corresponding lamp area A; or, each temperature detection module 20 is not connected to any group of lamp strings 11 in the corresponding lamp area A. This is not limited here, as long as the temperature detection module 20 can detect the temperature of the corresponding lamp area A.

[0084] See Figure 3, in this application, taking multiple lamp areas A including a first lamp area A1, a second lamp area A2, and a third lamp area A3 as an example, in an embodiment, each lamp string 11 is also connected to a voltage source VIN, and in each lamp area A, the temperature detection module 20 is connected in parallel with each lamp string 11. Among them, to avoid the conducting first transistor T1 affecting the light emission of the lamp string 11, the control module 40 is configured to control the first transistor T1 of the corresponding lamp area A to be in a conducting state when the lamp area A is in a non-operating state.

[0085] For example, when the lamp string 11 does not emit light, the constant current control chip, the drive circuit, etc. do not work, and the voltage source VIN supplies voltage normally. At this time, the lamp string 11 has no drive current and does not emit light. The control module 40 outputs a VG voltage to control the first transistor T1 to conduct, so that the temperature acquisition module 30 acquires the voltage of the first node n1, and then obtains the temperature parameter of the lamp area A.

[0086] Please continue to refer to Figure 3 , in an embodiment, the temperature acquisition module 30 includes: a logic control module 31, a shift register 32, and multiple second transistors T2; the first path end of each second transistor T2 is connected to a first node n1, the control end of each second transistor T2 is connected to the shift register 32, and the second path end of each second transistor T2 is connected to the logic control module 31.

[0087] Specifically, when the shift register 32 controls the second transistor T2 to be in a conducting state, the voltage of the first node n1 connected to the conducting second transistor T2 is fed back to the logic control module 31 through the second transistor T2, and the logic control module 31 further converts the voltage of the first node n1 into the corresponding temperature parameter of the lamp area A.

[0088] Please combine Figure 3 and Figure 4 , in an embodiment, the shift register 32 includes multiple D flip-flops 321, and the multiple D flip-flops 321 are connected to the multiple second transistors T2 in a one-to-one correspondence.

[0089] Among them, the data input terminal of each D flip-flop 321 is connected to the control module 40 to receive the acquisition signal sent by the control module 40, the clock input terminal of each D flip-flop 321 is connected to the control module 40 to receive the clock signal sent by the control module 40, and the in-phase output terminal of each D flip-flop 321 is connected to the data input terminal of the next adjacent D flip-flop 321 and the control end of the corresponding second transistor T2.

[0090] Please continue to refer to Figure 4, STV is the start acquisition signal, and CPV is the pulse signal. When the rising edge arrives, Q0 outputs a positive voltage until the next pulse of CPV arrives, and Q1 outputs a positive voltage. In this way, a positive turn-on voltage is generated in sequence and given to the second transistor T2 (MA, MB, MC) to sequentially acquire the voltages of VDD(1.1), VDD(1.2)… to VDD(1.n), etc., so that the voltage of the first node n1 corresponding to each light-emitting area A can be obtained, and then the temperature of each light-emitting area A can be obtained.

[0091] Specifically, for the display module 100 provided in this application, the control module 40 acquires the temperature parameters of each light-emitting area A based on multiple temperature detection modules 20 and temperature acquisition modules 30. If the temperature parameter of any light-emitting area A acquired by the temperature acquisition module 30 is greater than the preset threshold, at least the current corresponding to the first range of gray levels of the light beads in the light-emitting area A with the temperature parameter greater than the preset threshold is reduced, which can correspondingly reduce the heat generated by each gray level in the first range per unit time, thereby avoiding the problem that the light beads are affected by too high temperature and their optoelectronic characteristics and lifespan are affected. Further, when the temperature parameter of any light-emitting area A acquired by the temperature acquisition module 30 is greater than the preset threshold, the control module 40 can also at least reduce the duty cycle of the light-emitting time of the light beads in the light-emitting area A with the temperature parameter greater than the preset threshold, change the light-emitting time of the abnormal light-emitting area A, and make the off time longer. In this way, less heat is dissipated, and the longer the off time, the longer the heat dissipation time, so as to reduce the temperature of the light-emitting area A.

[0092] In addition, the display module 100 provided in this application can also protect the heat generated by the short circuit of the light beads. For example, when the temperature of any light-emitting area A acquired by the temperature acquisition module 30 changes suddenly in a short time, the control unit stops the power output of the light beads in this light-emitting area A, thereby protecting the entire light board 10.

[0093] It should be noted that the display module 100 provided in this application can be used not only as a backlight module but also as a light-emitting module. When the display module 100 is used as a light-emitting module, the Mini-LED light board 10 in the display module 100 can be divided into multiple pixel units so that the display module 100 can display corresponding images.

[0094] See Figure 9 , Figure 9 which is a schematic flow chart of the control method of the display module provided in an embodiment of this application.

[0095] This application also provides a control method for a display module. The display module may include the display module 100 provided in any of the above embodiments. The control method includes:

[0096] Step S1: When the lamp area is in a non-operating state, control the temperature detection module corresponding to the lamp area to work, and collect the temperature parameters of the corresponding lamp area detected by each temperature detection module through the temperature acquisition module.

[0097] Specifically, controlling the temperature acquisition module to collect the temperature parameters of the corresponding lamp area detected by each temperature detection module when the lamp area is in a non-operating state can avoid the influence on the light emission of the lamp string when the temperature acquisition module is turned on.

[0098] Step S2: If the temperature parameter of any lamp area collected by the temperature acquisition module is greater than the preset threshold, at least reduce the current corresponding to the first range of gray levels of the lamp beads in the lamp area where the temperature parameter is greater than the preset threshold.

[0099] Specifically, reducing the current corresponding to each gray level within the first range can correspondingly reduce the heat generated by each gray level within the first range per unit time, thereby avoiding the problem that the lamp beads are affected by high temperature and their optoelectronic characteristics and lifespan are affected.

[0100] Among them, the first range of gray levels can be 0 - 255 gray levels. In this scenario, the overall brightness of the entire display module 100 will decrease to some extent, but the problem that high temperature affects the optoelectronic characteristics and lifespan of the lamp beads can be avoided.

[0101] It should be noted that due to the Gamma effect of the human eye, the human eye is less sensitive to high light intensity. Therefore, in some embodiments, the first range of gray levels is high gray levels, such as 160 gray levels - 255 gray levels. Specifically, above 160 gray levels, the human eye is less sensitive to changes in brightness. Therefore, even if the brightness of the first range of gray levels decreases due to the reduction of the current corresponding to the first range of gray levels, the human eye will not observe a large brightness difference in terms of perception, so it will not affect the user's viewing experience. When it is below 160 gray levels, since the corresponding current is generally small, the heat generated by the lamp beads is not large itself, so current adjustment is not required.

[0102] In addition, when the display module is applied as a backlight module, since the backlight module mainly emits white light, controlling the module to at least reduce the current corresponding to the first range of gray levels of the lamp beads in the lamp area where the temperature parameter is greater than the preset threshold will not cause the problem of color drift of the display device using this display module compared to reducing the gray level current when the display module is applied as a light-emitting module.

[0103] In one embodiment, if the temperature parameter of any lamp area collected by the control module is greater than the preset threshold, the control module reduces the current corresponding to the first range of gray levels of the lamp beads in the lamp area where the temperature parameter is greater than the preset threshold, thereby avoiding the problem that the lamp beads in the high-temperature lamp area are in a high-temperature environment for a long time and their optoelectronic characteristics and lifespan are affected.

[0104] In another embodiment, when the temperature parameter of any light-emitting area collected by the temperature acquisition module is greater than a preset threshold, the control module reduces the current corresponding to the first range of gray levels of the lamp beads in each light-emitting area, thereby avoiding the problem that the lamp beads in the high-temperature light-emitting area are in a high-temperature environment for a long time, which affects the optoelectronic characteristics and lifespan of the lamp beads in the light-emitting area. It can be understood that, compared with only reducing the current corresponding to the first range of gray levels of the lamp beads in the high-temperature light-emitting area, the currents corresponding to the first range of gray levels of all the lamp beads on the entire lamp board are uniformly reduced, so that the light output of any light-emitting area of the entire display module is the same, further reducing the brightness difference perceived by the human eye at high gray levels.

[0105] See Figure 10 , Figure 10 which is a schematic flow chart of the control method of the display module provided in another embodiment of the present application.

[0106] In one embodiment, the control module drives the lamp beads to work by means of PWM dimming. This control method further includes:

[0107] Step S3: When the temperature parameter of any light-emitting area collected by the temperature acquisition module is greater than a preset threshold, the control module at least reduces the duty cycle of the light-emitting time of the lamp beads in the light-emitting area where the temperature parameter is greater than the preset threshold.

[0108] Specifically, since the lamp beads adopt PWM dimming, that is, the light-emitting time is not continuous, but on for a period of time and off for a period of time. In this way, power can also be saved. As long as the frequency is not within the range of human eye flicker frequency, the off time is invisible.

[0109] In the present application, for the light-emitting area with high temperature, the PWM dimming method is changed. First, through the collected temperature table, the light-emitting area with abnormal temperature (high temperature) is detected. After selecting the abnormal light-emitting area, the light-emitting time of the abnormal light-emitting area is changed to make the off time longer. In this way, less heat can be dissipated, and the longer off time means longer heat dissipation time, thereby reducing the temperature of the light-emitting area with abnormal temperature.

[0110] It should be noted that for the adjustment of the duty cycle, it cannot exceed the range of flicker visible to the human eye, otherwise the flicker phenomenon of the backlight will be seen.

[0111] Specifically, for the control method provided in this application, temperature parameters of each lamp area are collected based on multiple temperature detection modules and a temperature acquisition module. If the temperature parameter of any lamp area collected by the temperature acquisition module is greater than a preset threshold, at least the current corresponding to the first range of gray levels of the lamp beads in the lamp area where the temperature parameter is greater than the preset threshold is reduced. This can correspondingly reduce the heat generated by each gray level within the first range per unit time, thereby avoiding problems that the optoelectronic characteristics and lifespan of the lamp beads are affected due to excessive temperature. Further, if the temperature parameter of any lamp area collected by the temperature acquisition module is greater than the preset threshold, the duty cycle of the light-emitting time of the lamp beads in the lamp area where the temperature parameter is greater than the preset threshold is also at least reduced, changing the light-emitting time of the abnormal lamp area to make the off time longer. In this way, less heat is dissipated, and since the off time is long, the heat dissipation time is extended, thereby reducing the temperature of the lamp area.

[0112] In addition, for the control method of the display module provided in this application, it can also protect against heat generation caused by lamp bead short circuits. For example, when the temperature of any lamp area collected by the temperature acquisition module suddenly changes within a short period of time, the power output to the lamp beads in this lamp area is stopped, thereby protecting the entire lamp board.

[0113] See Figure 11 , Figure 11 FIG. is a schematic structural diagram of a display device provided in an embodiment of this application. Specifically, this application also provides a display device 1000, which can be applied in fields such as mobile phones, computers, laptops, and smart wearable devices. The display device 1000 includes the display module 100 provided in any of the above embodiments.

[0114] Specifically, the display device 1000 applying the display module 100 can avoid problems that the optoelectronic characteristics and lifespan of Mini-LED lamp beads are affected due to excessive temperature.

[0115] In an embodiment of this application, the display device 1000 further includes a display panel 200. Among them, the display panel 200 can be an LCD display panel. The display panel 200 is disposed on the light-emitting side of the display module 100, and the display module 100 is used as a backlight module for the display panel 200 to provide a backlight source for the display panel 200.

[0116] The above are only the implementation manners of this application, and do not limit the patent scope of this application accordingly. Any equivalent structural or equivalent process transformation made using the content of the specification and drawings of this application, or directly or indirectly applied in other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. A display module, characterized in that: include: A light board, wherein the light board has a plurality of light beads and is divided into a plurality of light areas; A plurality of temperature detection modules are arranged corresponding to the plurality of light zones one by one; A temperature acquisition module, connected to the plurality of temperature detection modules, for acquiring the temperature parameters of the corresponding lamp area detected by each temperature detection module; A control module connected to the plurality of lamp beads, the plurality of temperature detection modules and the temperature acquisition module, the control module being used to control the operation of the plurality of lamp beads, the plurality of temperature detection modules and the temperature acquisition module, and the control module at least reducing the current corresponding to the first range grayscale of the lamp beads in the lamp zone having a temperature parameter greater than the preset threshold value based on the temperature parameter of any of the lamp zones acquired by the temperature acquisition module being greater than a preset threshold value; Each of the temperature detection modules includes a first transistor and a grounding resistor, the control end of the first transistor is connected to the control module, the first path end of the first transistor is connected to a voltage source, the second path end of the first transistor, the first end of the grounding resistor and the temperature detection module are connected to a first node, and the second end of the grounding resistor is grounded; When the control module controls the first transistor to be in an on state, the temperature detection module detects the voltage of the first node.

2. The display module according to claim 1, characterized in that: The first range of grayscales is grayscale 160-grayscale 255.

3. The display module according to claim 1 or 2, characterized in that: Each of the lamp areas includes a plurality of lamp strings, each of the lamp strings includes a plurality of lamp beads connected in series, and each of the lamp strings is also connected to the voltage source; In each of the lamp zones, the temperature detection module is connected in parallel with each group of the lamp strings, wherein the control module is used to control the first transistor corresponding to the lamp zone to be in a conducting state when the lamp zone is in a non-working state.

4. The display module according to claim 1 or 2, characterized in that: The temperature acquisition module comprises: a logic control unit, a shift register and a plurality of second transistors; the first path end of each second transistor is connected to one of the first nodes, the control end of each second transistor is connected to the shift register, and the second path end of each second transistor is connected to the logic control unit; Wherein, when the shift register controls the second transistor to be in the on state, the voltage of the first node connected to the second transistor in the on state is fed back to the logic control unit through the second transistor, and the logic control unit further converts the voltage of the first node into the corresponding temperature parameter of the lamp zone.

5. The display module according to claim 4, characterized in that: The shift register comprises a plurality of D flip-flops, and the plurality of D flip-flops are connected to the plurality of the second transistors in a one-to-one correspondence; Among them, the data input end of each D flip-flop is connected to the control module to receive the acquisition signal sent by the control module, the clock input end of each D flip-flop is connected to the control module to receive the clock signal sent by the control module, and the same-direction output end of each D flip-flop is connected to the data input end of the next adjacent D flip-flop and the corresponding control end of the second transistor.

6. The display module according to claim 1, characterized in that: Based on the fact that the temperature parameter of any of the lamp zones collected by the temperature collection module is greater than a preset threshold, the control module further reduces at least the duty cycle of the light emission time of the lamp beads in the lamp zone whose temperature parameter is greater than the preset threshold.

7. A display device, characterized in that: The display device comprises the display module according to any one of claims 1-6.

8. A control method for a display module, comprising a lamp board, the lamp board having a plurality of lamp beads, and the lamp board being divided into a plurality of lamp areas, characterized in that: The display module is the display module according to any one of claims 1 to 6, and the control method comprises: When the lamp area is in a non-working state, controlling the temperature detection modules corresponding to the lamp area to work, and acquiring the temperature parameters of the corresponding lamp area detected by each temperature detection module through the temperature acquisition module; Based on the fact that the temperature parameter of any of the lamp zones collected by the temperature collection module is greater than a preset threshold, at least the current corresponding to the first range of grayscales of the lamp beads in the lamp zone whose temperature parameter is greater than the preset threshold is reduced.

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