Display device and display module thereof

Abstract

The present disclosure relates to a display device and a display module thereof, and belongs to the technical field of display. The module comprises a display panel, a light-emitting unit, a light-emitting control circuit and a control circuit, the display panel has a temperature sensing trace; the temperature sensing voltage is greater than a first threshold value in a t period, a first duty cycle of the first dimming signal is less than a second duty cycle; the temperature sensing voltage is less than a second threshold value in the t period, the first duty cycle is greater than the second duty cycle; the first duty cycle is a duty cycle of the first dimming signal in a t+1 period, and the second duty cycle is a duty cycle of the first dimming signal in the t period.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and more specifically, to a display device and its display module. Background Technology

[0002] Display devices are widely used in electronic devices such as televisions and mobile phones. During use, changes in ambient temperature can affect the display effect of the display device. In particular, under high temperature environments, display devices are prone to display abnormalities such as uneven brightness, flickering, and black screen.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] This disclosure provides a display device and display module that can reduce the risk of display malfunctions.

[0005] According to one aspect of this disclosure, a display module is provided, comprising:

[0006] The display panel has temperature sensing traces, which have a temperature sensing input terminal and a temperature sensing output terminal.

[0007] The light-emitting unit has a light-emitting input terminal;

[0008] The light-emitting control circuit includes:

[0009] The first dimming input terminal is used to receive a first dimming signal that controls the brightness of the light-emitting unit;

[0010] The second dimming input terminal is used to receive a second dimming signal that adjusts the brightness of the light-emitting unit;

[0011] The dimming output terminal is electrically connected to the light-emitting input terminal and is used to output a light-emitting driving signal generated based on the first dimming signal and the second dimming signal;

[0012] Control circuit, including:

[0013] The first sampling input terminal is electrically connected to the temperature sensing output terminal and is used to receive the temperature sensing voltage of the display panel;

[0014] The first dimming control output terminal is electrically connected to the first dimming input terminal and is used to output the first dimming signal;

[0015] The second dimming control output terminal is electrically connected to the second dimming input terminal and is used to output the second dimming signal;

[0016] Wherein, the temperature sensing voltage and the first dimming signal satisfy:

[0017] During time period t, the temperature sensing voltage is greater than the first threshold, and the first duty cycle of the first dimming signal is less than the second duty cycle; during time period t, the temperature sensing voltage is less than the second threshold, and the first duty cycle is greater than the second duty cycle; the first duty cycle is the duty cycle of the first dimming signal during time period t+1, and the second duty cycle is the duty cycle of the first dimming signal during time period t.

[0018] And / or, the temperature sensing voltage and the second dimming signal satisfy:

[0019] During time period t, the temperature sensing voltage is greater than the first threshold, and the first voltage value of the second dimming signal is less than the second voltage value; during time period t, the temperature sensing voltage is less than the second threshold, and the first voltage value is greater than the second voltage value; the first voltage value is the voltage of the second dimming signal during time period t+1, and the second voltage value is the voltage of the second dimming signal during time period t.

[0020] In one exemplary embodiment of this disclosure, the first threshold is greater than the second threshold.

[0021] In one exemplary embodiment of this disclosure, the temperature-sensing voltage and the first dimming signal satisfy:

[0022] When the temperature sensing voltage is continuously greater than the first threshold for a specified first temperature sensing duration, the first duty cycle is less than the second duty cycle; when the temperature sensing voltage is continuously not greater than the first threshold for a specified second temperature sensing duration, the first duty cycle is greater than the second duty cycle.

[0023] And / or, the temperature sensing voltage and the second dimming signal satisfy:

[0024] The duration during which the temperature sensing voltage is continuously greater than the first threshold reaches the first temperature sensing duration; the first voltage value is less than the second voltage value; the duration during which the temperature sensing voltage is continuously not greater than the first threshold reaches the second temperature sensing duration, and the first voltage value is greater than the second voltage value.

[0025] The first temperature sensing duration is not greater than the second temperature sensing duration, and the durations of the t time period and the t+1 time period are not less than the temperature sensing duration.

[0026] In one exemplary embodiment of this disclosure, the display panel includes an array substrate, an opposing substrate, and a liquid crystal layer disposed between the array substrate and the opposing substrate; the light-emitting unit is disposed on the side of the array substrate away from the opposing substrate.

[0027] In one exemplary embodiment of this disclosure, the control circuit further includes a backlight switch terminal, which is electrically connected to the light-emitting unit and is used to transmit a backlight off signal and a backlight on signal to the light-emitting unit.

[0028] The temperature sensing voltage and the first dimming signal satisfy the following:

[0029] During time period t, the temperature sensing voltage is greater than the first threshold, and the second duty cycle is greater than the first adjustment value. The difference between the first duty cycle and the second duty cycle is the first adjustment value.

[0030] If the temperature sensing voltage is greater than the first threshold during time period t, and the second duty cycle is not greater than the first adjustment value, the control circuit outputs the backlight off signal during time period t+1.

[0031] In one exemplary embodiment of this disclosure, the temperature-sensing voltage and the second dimming signal satisfy:

[0032] During time period t, the temperature sensing voltage is less than the second threshold, and the second duty cycle is less than the difference between 100% and the second adjustment value. The difference between the first duty cycle and the second duty cycle is the second adjustment value.

[0033] During time period t, the temperature sensing voltage is less than the second threshold, and the second duty cycle is greater than the difference between 100% and the second adjustment value, wherein the first duty cycle is 100%.

[0034] In one exemplary embodiment of this disclosure, the display module further includes a power management circuit, which is electrically connected to an external power supply and is used to control the display panel to start and stop.

[0035] When the temperature sensing voltage is greater than the first threshold during time period t and the second duty cycle is not greater than the first adjustment value, the control circuit outputs the backlight off signal to the power management circuit during time period t+1, and the power management circuit turns off the display panel.

[0036] In one exemplary embodiment of this disclosure, the temperature sensing voltage satisfies a preset temperature-voltage conversion relationship, and in the temperature-voltage conversion relationship, a voltage corresponds to a temperature;

[0037] If the temperature sensing voltage is greater than the first threshold during time period t, the difference between the first duty cycle and the second duty cycle is the first adjustment value;

[0038] If the temperature sensing voltage is less than the second threshold during time period t, then the difference between the first duty cycle and the second duty cycle is the second adjustment value during time period t+1.

[0039] The first adjustment value satisfies the following relationship:

[0040] Y1 = [(TH-X) / CA] × 100%;

[0041] The second adjustment value satisfies the following relationship:

[0042] Y2 = [(TL-X) / C+B]×100%;

[0043] Y1 is the first adjustment value, TH is the first threshold, X is the temperature sensing voltage, TL is the second threshold, C is the voltage corresponding to the temperature rise of the display panel surface caused by light emission in the temperature-voltage conversion relationship, A is the minimum magnitude of decreasing the duty cycle, B is the minimum magnitude of increasing the duty cycle, and C, A and B are all preset constants.

[0044] In one exemplary embodiment of this disclosure, the temperature-sensing voltage and the first dimming signal satisfy:

[0045] During time period t, the duration for which the sensing voltage is greater than the first threshold and less than the third threshold reaches the first sensing duration, wherein the third threshold is greater than the first threshold; the difference between the first duty cycle and the second duty cycle is the first duty cycle difference;

[0046] The duration for which the temperature sensing voltage remains not less than the third threshold during time period t reaches the third temperature sensing duration, the first duty cycle is less than the second duty cycle; and the difference between the first duty cycle and the second duty cycle is the second duty cycle difference;

[0047] The third temperature sensing duration is not greater than the first temperature sensing duration, and the absolute value of the second duty cycle difference is greater than the absolute value of the first duty cycle difference.

[0048] In one exemplary embodiment of this disclosure, the duration during time period t when the temperature sensing voltage is greater than a first threshold and less than a third threshold reaches the first temperature sensing duration, wherein the third threshold is greater than the first threshold; the difference between the first voltage value and the second voltage value is the first voltage difference;

[0049] The duration during time period t when the temperature sensing voltage is not less than the third threshold reaches the third temperature sensing duration, the first voltage value is less than the second voltage value, and the difference between the first voltage value and the second voltage value is the second voltage difference;

[0050] The third temperature sensing duration is not greater than the first temperature sensing duration, and the absolute value of the second pressure difference is greater than the absolute value of the first pressure difference.

[0051] In one exemplary embodiment of this disclosure, the temperature sensing voltage satisfies a preset temperature-voltage conversion relationship, and in the temperature-voltage conversion relationship, a voltage corresponds to a temperature;

[0052] The duration during time period t when the temperature sensing voltage is greater than the first threshold and less than the third threshold reaches the first temperature sensing duration, and the difference between the first duty cycle and the second duty cycle is the third adjustment value;

[0053] The duration for which the temperature sensing voltage remains not less than the third threshold reaches the third temperature sensing duration, and the difference between the first duty cycle and the second duty cycle is the fourth adjustment value;

[0054] The third adjustment value satisfies the following relationship:

[0055] Y3 = [(TH-X) / CE] × 100%;

[0056] The fourth adjustment value satisfies the following relationship:

[0057] Y4=[(TM-X)×K / CF]×100%;

[0058] Y3 is the third adjustment value, Y4 is the fourth adjustment value, TH is the first threshold, TM is the third threshold, X is the temperature sensing voltage, C is the voltage corresponding to the temperature rise of the display panel surface caused by light emission based on the temperature-voltage conversion relationship, K, E and F are all constants, and F is greater than E, 1 < K < 4.

[0059] In one exemplary embodiment of this disclosure, the temperature sensing voltage satisfies a preset temperature-voltage conversion relationship, and in the temperature-voltage conversion relationship, a voltage corresponds to a temperature;

[0060] Based on the aforementioned temperature-voltage conversion relationship:

[0061] The temperature corresponding to the first threshold is less than 80°C and not less than 78°C;

[0062] The temperature corresponding to the second threshold is no greater than 75℃;

[0063] The temperature corresponding to the third threshold is not less than 80℃ and not greater than 85℃.

[0064] In one exemplary embodiment of this disclosure, the display module further includes a first voltage divider resistor;

[0065] The temperature sensing voltage satisfies a preset temperature-voltage conversion relationship, and in the temperature-voltage conversion relationship, one voltage corresponds to one temperature; the control circuit is further used for:

[0066] If the temperature corresponding to the temperature sensing voltage is different from the specified ambient temperature under a specified ambient temperature, the temperature corresponding to the temperature sensing voltage is corrected to the specified ambient temperature, and the temperature-voltage conversion relationship is updated accordingly.

[0067] In one exemplary embodiment of this disclosure, the control circuit further includes a second sampling input terminal and a power control terminal, wherein the power control terminal is electrically connected to the second sampling input terminal; one end of the first voltage divider resistor is electrically connected to the first sampling input terminal, and the other end is electrically connected to a constant potential.

[0068] In one exemplary embodiment of this disclosure, the temperature sensing voltage is the average value of the voltages acquired m times within a specified sampling duration, where m is greater than 1; the first temperature sensing duration and the second temperature sensing duration are integer multiples of the sampling duration.

[0069] In one exemplary embodiment of this disclosure, the display module further includes a second voltage divider resistor and a third voltage divider resistor, the second voltage divider resistor and the third voltage divider resistor being connected in series between a constant potential terminal and the temperature sensing input terminal; the second sampling input terminal is electrically connected between the second voltage divider resistor and the third voltage divider resistor;

[0070] The temperature sensing voltage obtained from the first sampling input terminal is used as the first voltage, and the temperature sensing voltage obtained from the second sampling input terminal is used as the second voltage.

[0071] The control circuit is also used for:

[0072] When the first voltage is not greater than k1 times the second voltage and not less than k2 times the second voltage, the temperature corresponding to the first voltage based on the temperature-voltage conversion relationship is corrected to the specified ambient temperature, and the temperature-voltage conversion relationship is updated accordingly; 1 < k1 < 2, 0 < k2 < 1.

[0073] In one exemplary embodiment of this disclosure, the display module further includes a calibration switch, and the control circuit has a calibration switch terminal; the calibration switch is electrically connected to the calibration switch terminal and is used to output a start signal and a stop signal to the control circuit;

[0074] The control circuit is also used for:

[0075] Upon receiving the start signal, the light-emitting unit is turned off, and when the first voltage is not greater than k1 times the second voltage and not less than k2 times the second voltage, the temperature corresponding to the first voltage based on the temperature-voltage conversion relationship is corrected to the specified ambient temperature, and the temperature-voltage conversion relationship is updated accordingly; 1 < k1 < 2, 0 < k2 < 1.

[0076] In one exemplary embodiment of this disclosure, k1 = 1.6 and k2 = 0.4.

[0077] In one exemplary embodiment of this disclosure, the display module further includes a first indicator circuit, the first indicator circuit including a first indicator light of a first color; the control circuit includes a first indicator terminal, and the first indicator circuit is electrically connected to the first indicator terminal;

[0078] The control circuit is also used for:

[0079] During the process of acquiring the first voltage, comparing the first voltage with the second voltage, and updating the temperature-voltage conversion relationship, the first indicator light is controlled to flash;

[0080] After updating the temperature-voltage conversion relationship, the first indicator light is kept on.

[0081] In one exemplary embodiment of this disclosure, the display module further includes a second indicator circuit, the second indicator circuit including a second indicator light of a second color; the control circuit includes a second indicator terminal, the second indicator terminal being electrically connected to the second indicator circuit; the second color is different from the first color;

[0082] The control circuit is also used for:

[0083] When the first voltage is greater than k1 times the second voltage or less than k2 times the second voltage, the second indicator light is kept on.

[0084] In one exemplary embodiment of this disclosure, the control circuit further includes a second sampling input terminal and a power control terminal. The second sampling input terminal is electrically connected to the input terminals of the power management circuit and the temperature sensing trace. The power management circuit is used to supply power to the control circuit and the temperature sensing trace. The power control terminal is electrically connected to the power management circuit. The power control terminal is used to output a power control signal that causes the power management circuit to control the display panel to start and stop.

[0085] In one exemplary embodiment of this disclosure, the control circuit has a power control terminal, which is electrically connected to the power management circuit; the power control terminal is used to output a power control signal that causes the power management circuit to control the display panel to start and stop.

[0086] The display module also includes a first switching element and a power supply circuit;

[0087] The control electrode of the first switching element is electrically connected to the power control terminal, the first electrode is electrically connected to the external power supply, and the second electrode is electrically connected to the power management circuit; the first switching element can be turned on and off under the control of the power control signal output by the power control terminal.

[0088] The power supply circuit is electrically connected to the external power source and the control circuit, and is used to supply power to the control circuit.

[0089] In one exemplary embodiment of this disclosure, the display module further includes a second switching element, the control electrode of the second switching element being electrically connected to the power control terminal, the first electrode being electrically connected to a constant potential, and the second electrode being electrically connected to the control electrode of the second switching element; the first switching element is a P-type MOS transistor, and the second switching element is a transistor.

[0090] According to one aspect of this disclosure, a display device is provided, comprising the display module described in any of the preceding claims.

[0091] The display device and display module disclosed herein have temperature-sensing traces in the display panel. By utilizing the characteristic that resistance changes with temperature, the relationship between temperature and resistance can be determined when the relationship between temperature and resistance is known. Thus, the temperature of the display panel can be determined by the temperature-sensing voltage. Compared with the ambient temperature, the sensing voltage detected by the temperature-sensing traces on the display panel can more accurately reflect the temperature of the display panel.

[0092] Since there is a one-to-one correspondence between temperature and voltage, the range formed by the first and second thresholds corresponds to a temperature range. The control circuit compares the temperature-sensing voltage with the first and second thresholds. If the temperature-sensing voltage is greater than the first threshold, it indicates that the display panel temperature is too high. In this case, the brightness of the light-emitting unit can be reduced to lower the temperature, thus protecting the display panel and reducing the risk of display abnormalities such as uneven brightness, flickering, and black screen caused by high temperature. If the temperature-sensing voltage is within the range of the first and second thresholds, the display panel can operate normally, and the brightness does not need to be adjusted. If the temperature-sensing voltage is less than the second threshold, the brightness of the light-emitting unit can be increased to improve the display effect.

[0093] The brightness of the light-emitting unit can be adjusted at least by the first dimming signal and the second dimming signal output by the control circuit. The first dimming signal can be used to control the duty cycle, and the second dimming signal can control the voltage. Therefore, when adjusting the brightness of the light-emitting unit, the duty cycle of the first dimming signal can be increased or decreased, or the voltage of the second dimming signal can be increased or decreased. Of course, both methods can also be used.

[0094] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0095] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0096] Figure 1 This is a schematic diagram of one embodiment of the display device disclosed herein.

[0097] Figure 2 This is a schematic diagram of another embodiment of the display device disclosed herein.

[0098] Figure 3 This is a partial schematic diagram of a first type of embodiment of the display device disclosed herein.

[0099] Figure 4 for Figure 3 Timing diagram of the display device.

[0100] Figure 5 This is a partial schematic diagram of a second type of embodiment of the display device disclosed herein.

[0101] Figure 6 for Figure 5 Timing diagram of the display device.

[0102] Figure 7 This is a partial schematic diagram of a third embodiment of the display device disclosed herein.

[0103] Figure 8 for Figure 7 Timing diagram of the display device.

[0104] Figure 9 This is a partial schematic diagram of a fourth type of embodiment of the display device disclosed herein.

[0105] Figure 10 for Figure 9 Timing diagram of the display device.

[0106] Figure 11 This is a partial schematic diagram of a fifth type of embodiment of the display device disclosed herein.

[0107] Figure 12 for Figure 11 Timing diagram of the display device.

[0108] Figure 13 This is a schematic diagram of a first indicator circuit and a second indicator circuit in one embodiment of the display device of this disclosure.

[0109] Figure 14 This is a schematic diagram of the control circuit in one embodiment of the display device of this disclosure.

[0110] Figure 15 This is a schematic diagram of a memory in one embodiment of the display device of this disclosure.

[0111] Figure 16 This is a schematic diagram of a protection circuit in one embodiment of the display device of this disclosure.

[0112] Figure 17 This is a schematic diagram of a breakdown protection circuit in one embodiment of the display device of this disclosure.

[0113] Figure 18 This is a schematic diagram of a reset circuit in one embodiment of the display device of this disclosure.

[0114] Figure 19 This is a schematic diagram of a calibration switch in one embodiment of the display device of this disclosure.

[0115] Figure 20 This is a flowchart of one embodiment of the driving method disclosed herein.

[0116] Figure 21 This is a flowchart of another embodiment of the driving method disclosed herein. Detailed Implementation

[0117] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0118] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0119] This disclosure provides a display device, which may be a television, mobile phone, tablet computer, electronic whiteboard, electronic drawing screen, computer monitor, etc., and will not be listed in detail here. Figure 1 and Figure 2As shown, the display device includes a display module and a driving circuit. The display module may include a display panel, light-emitting units (LEDs), and a light-emitting control circuit BC. The driving circuit is electrically connected to the display panel and the light-emitting control circuit BC. The light-emitting units (LEDs) are also electrically connected to the light-emitting control circuit BC. The driving circuit can display images by driving the display panel and the light-emitting units (LEDs).

[0120] The display panel may include a display area AA and an outer peripheral area WA located outside the display area AA. The outer peripheral area WA may be a continuous ring-shaped area surrounding the display area AA, or it may be a discontinuous area surrounding the display area AA.

[0121] In some embodiments of this disclosure, the light-emitting unit (LED) is disposed on the display panel and can emit light to display images. For example, the display panel can be an OLED (Organic Light Emitting Diode) display panel, a Micro LED (Micron Light Emitting Diode) panel, or a Mini LED (Submillimeter Light Emitting Diode) panel; it can also be a QLED (Quantum Dot Diode) display panel, etc. The light-emitting unit may include multiple light-emitting elements arranged in an array. The light-emitting elements can be the aforementioned OLED, Micro LED, and Mini LED, or QLED, etc.

[0122] like Figure 1 and Figure 2 As shown, in some embodiments of this disclosure, the display module may also be a liquid crystal display module, and its display panel may include an array substrate and a counter substrate disposed opposite each other, and may also include a liquid crystal layer disposed between the array substrate and the counter substrate. The array substrate has multiple pixel electrodes, and the array substrate or the counter substrate is substantially provided with a common electrode.

[0123] The light-emitting unit (LED) can be located on the side of the array substrate facing away from the opposing substrate, and the LED is a backlight comprising multiple light-emitting elements. The LED acts as a light source, emitting light onto the array substrate. The array substrate can control the deflection state of liquid crystal molecules by controlling the electric field between the pixel electrode and the common electrode, thereby controlling the grayscale and achieving image display. The opposing substrate can be a color filter substrate, which may have multiple color resists, achieving color display through the filtering effect of different colors of color resists.

[0124] Of course, in some implementations, the display panel may not have color resist, but instead the light-emitting unit emits light of different colors, and color display is achieved through field sequence display.

[0125] The light-emitting control circuit BC has a dimming output terminal, which can be electrically connected to the light-emitting input terminal of the light-emitting unit LED, and can output a light-emitting drive signal to the light-emitting unit to make the light-emitting unit LED emit light. For example, the dimming output terminal may have a first port LED+ and a second port LED-, both of which are connected to the light-emitting unit LED.

[0126] When displaying images, a liquid crystal display module needs to acquire signals from the circuitry driving the array substrate and signals driving the light-emitting units to emit light. For example, the display panel may also include pixel circuitry, a gate drive array (GOA) circuit, a timing control circuit (TCON), a source drive circuit (SIC), and a power management circuit (PMIC), wherein:

[0127] Pixel circuits are located in the display area AA, and there are multiple pixel circuits arranged in multiple rows and columns within the display area AA. Each pixel circuit may include at least one transistor electrically connected to a pixel electrode. The gate drive circuit GOA is located in the peripheral area WA and can scan each row of pixel circuits through the output scan signal, that is, control the turn-on and turn-off of the transistors through the scan signal so that the pixel circuits can receive data signals.

[0128] The source drive circuit SIC can input the aforementioned data signals to each column of pixel circuits, thereby controlling the voltage of each pixel electrode through the pixel circuits to achieve grayscale control.

[0129] The timing control circuit TCON can be a chip that is electrically connected to the source driver circuit SiC and the gate driver circuit GOA. The timing control circuit TCON can output clock signals and other source drive signals to the source driver circuit SiC, enabling SiC to output data signals to the pixel circuit. The timing control circuit TCON can also output clock signals and other gate drive signals to the gate driver circuit GOA, enabling GOA to output scan signals to the pixel circuit.

[0130] The power management circuit PMIC can be electrically connected to an external power supply, which can supply power to the power management circuit PMIC. The power management circuit PMIC can output power signals to the timing control circuit TCON, the gate drive circuit GOA, and the source drive circuit SIC to achieve power supply.

[0131] For example, the power management circuit (PMIC) can provide multiple constant-voltage power signals to each of the timing control circuit (TCON), the source drive circuit (SIC), and the gate drive circuit (GOA) to operate the timing control circuit (TCON), the gate drive circuit (GOA), and the source drive circuit (SIC); wherein the voltages of the different constant-voltage signals can be different. For example, the power signals output by the PMIC to the timing control circuit (TCON) include at least four types (DVDD, 3V3, 1V8, and 1V2), the power signals output by the PMIC to the gate drive circuit (GOA) include at least three types (VGH, VGL, and LVGL), and the power signals output by the PMIC to the gate drive circuit (GOA) include at least two types (AVDD and HAVDD).

[0132] like Figure 1 and Figure 2 As shown, the timing control circuit TCON and power management circuit PMIC mentioned above can be included in a driving circuit for driving the display panel. This driving circuit can be integrated into a timing control circuit board TC. The timing control circuit board TC can be electrically connected to the display panel through a flexible circuit board FPC; or, the timing control circuit board TC can be electrically connected to the flexible circuit board FPC through an electrical connection circuit board, and the flexible circuit board FPC is electrically connected to the display panel, thereby electrically connecting the display panel and the timing control circuit board TC through the connection circuit board and the flexible circuit board FPC.

[0133] The source drive circuit SiC can be mounted on a flexible printed circuit board (FPC) or a display panel. The light emission control circuit BC can be integrated into a light emission control circuit board, which can also be electrically connected to the light emission unit LED via the FPC.

[0134] like Figure 1 and Figure 2 As shown, the display device may also include a main control circuit SO, which can be electrically connected to the drive circuit and act as a host computer to control the drive circuit to drive the display module to display images. The main control circuit SO may include a central processing unit, memory, and graphics processor, etc., and may be a SOC (system-on-a-chip), etc.

[0135] The aforementioned driving circuit may include a control circuit MC, which can be an MCU (microcontroller unit), i.e., a single-chip microcomputer, or other circuits with data processing functions. The control circuit MC has a control power supply terminal VCC, which can be electrically connected to a power management circuit PMIC. The power management circuit PMIC can supply power to the control circuit MC through the control power supply terminal VCC. Of course, the control power supply terminal VCC can also be electrically connected to an external power supply, as long as it can provide power to the control circuit MC.

[0136] like Figure 1 and Figure 2 As shown, the control circuit MC can be electrically connected to the light-emitting control circuit BC, and can control the start-up, shutdown, and brightness of the light-emitting unit LED. The light-emitting control circuit BC can be electrically connected to the backlight switch input BL, the first dimming input PW, and the second dimming input AJ of the light-emitting control circuit BC via at least the backlight switch terminal GPIO2, the first dimming control output terminal GPIO3, and the second dimming control output terminal GPIO4, respectively. It outputs a backlight switch signal BL_ON / OFF via the backlight switch terminal GPIO2, a first dimming signal PWM via the first dimming control output terminal GPIO3, and a second dimming signal ADJ via the second dimming control output terminal GPIO4. The light-emitting drive signal output by the dimming output terminal of the light-emitting control circuit BC is generated based on at least one of the first dimming signal PWM and the second dimming signal ADJ, and can control the brightness of the light-emitting unit LED by duty cycle and voltage.

[0137] When the backlight switch signal BL_ON / OFF is high, the light-emitting control circuit BC can control the LED unit to power on; when the backlight switch signal BL_ON / OFF is low, it can stop supplying power to the LED unit and stop it from emitting light.

[0138] The first dimming signal PWM can be a pulse signal. By adjusting the duty cycle of the first dimming signal PWM, the flicker frequency of the LED unit can be adjusted, thereby visually achieving the purpose of adjusting the brightness. The larger the duty cycle of the first dimming signal PWM, the higher the brightness of the LED unit.

[0139] The second dimming signal ADJ can adjust the power of the backlight module through its own voltage, thereby achieving brightness adjustment.

[0140] The inventors discovered that the display effect of display devices is easily affected by temperature. When the temperature is too high, problems such as black screen, flickering, and uneven brightness can easily occur. To solve this problem, the ambient temperature of the environment in which the display device is located or the internal temperature of the display device's casing can be detected. When the temperature is too high, external cooling devices such as fans can be used to cool it down, and the cooling effect can be adjusted by adjusting the fan speed. However, this method has a limited range of temperature adjustment, and since it detects the internal or external ambient temperature of the display device rather than the temperature of the display panel itself, there may be a certain difference between the two, making the timing of temperature adjustment untimely and not conducive to improving the display effect.

[0141] Therefore, the inventor further proposed, such as Figure 1 and Figure 2As shown, a temperature-sensing trace PTC can be set in the display panel panel. It can be made of metal and can be set in the outer area WA of the display panel panel and distributed around the display area AA; or, the display panel panel has spaced sub-pixels and light-shielding areas that separate the sub-pixels, and the temperature-sensing trace PTA can also be set in the display area AA and located in the light-shielding areas between the sub-pixels.

[0142] like Figure 1 and Figure 2 As shown, in some embodiments of this disclosure, the temperature sensing trace PTC can be disposed in the array substrate. The temperature sensing trace PTC is partially disconnected, forming two ends, namely the temperature sensing input terminal TI and the temperature sensing output terminal TO. The temperature sensing input terminal TI can be electrically connected to the power management circuit PMIC. The power management circuit PMIC can input a constant voltage signal to the temperature sensing trace PTC. This voltage can be 3.3V, and the specific value is not specifically limited here. The temperature sensing output terminal TO can be electrically connected to the first sampling input terminal ADC1 of the control circuit MC. The temperature sensing voltage can be obtained through the first sampling input terminal ADC1. Meanwhile, the driving circuit may also include a first voltage divider resistor R1, one end of which can be electrically connected to the temperature sensing output terminal TO of the aforementioned temperature sensing trace PTC, and the other end can be grounded or connected to other constant potentials; the temperature sensing trace PTC can be regarded as a resistor, so the first voltage divider resistor R1 and the temperature sensing trace PTC can be regarded as a voltage divider circuit connected in series with the power management circuit PMIC; if the temperature of the display panel changes, it will cause the resistivity of the temperature sensing trace PTC to change, which in turn will cause the temperature sensing voltage output by its temperature sensing output terminal TO to change. The temperature sensing voltage obtained by the control circuit MC satisfies the following relationship:

[0143] Vout = U × R1 / (RP + R1);

[0144] Vout is the temperature sensing voltage, U is the voltage at the temperature sensing input terminal TI of the temperature sensing trace PTC, R1 is the first voltage divider resistor, and RP is the resistance of the temperature sensing trace PTC.

[0145] Furthermore, such as Figure 1 As shown, the driving circuit may also include a capacitor C1 connected in parallel with the first voltage divider resistor R1, which can serve as a filter and voltage regulator.

[0146] With the voltage at the input terminal of the temperature sensing trace PTC fixed, the temperature sensing voltage at the temperature sensing output terminal TO of the temperature sensing trace PTC can reflect the temperature of the display panel. The current temperature can be determined by the currently measured temperature sensing voltage and the preset temperature-voltage conversion relationship.

[0147] Based on empirical data, prior experiments, and the correlation between resistivity and temperature, a temperature-voltage conversion relationship reflecting voltage and temperature can be established. Since this relationship is pre-defined, a single temperature-sensing voltage corresponds to a unique temperature, and vice versa. For the driving circuit, temperature can be reflected through voltage. In this paper, when making judgments based on temperature, the judgment can actually be based on the temperature-sensing voltage. For example, when comparing a temperature with a temperature threshold, the temperature-sensing voltage corresponding to that temperature can be compared with the voltage value corresponding to the temperature threshold. Correspondingly, comparing the temperature-sensing voltage with the voltage threshold is essentially comparing the corresponding temperature with the temperature threshold.

[0148] like Figure 1 and Figure 2 As shown, the temperature-sensing voltage output from the temperature-sensing trace PTC can be obtained by the control circuit MC. The temperature-sensing voltage reflects the temperature of the display panel. The circuit then determines whether the voltage meets the first and second conditions based on preset thresholds, and adjusts the brightness of the LED light-emitting unit based on the determination result. These thresholds include a first threshold and a second threshold, with the first threshold being greater than the second threshold.

[0149] like Figure 1 and Figure 2 As shown, in some embodiments of this disclosure, based on the above-described temperature-voltage conversion relationship, the temperature corresponding to the first threshold is not less than 78°C and less than 80°C, for example, the temperature corresponding to the first threshold is 78°C; the temperature corresponding to the second threshold is not greater than 75°C, for example, the temperature corresponding to the second threshold is 74°C. The first condition includes a sensing voltage greater than the first threshold; the second condition includes a sensing voltage less than the second threshold.

[0150] If the control circuit MC determines that the temperature sensing voltage meets the first condition, it updates the first dimming signal PWM, making the duty cycle of the updated first dimming signal PWM smaller than the duty cycle of the original first dimming signal PWM, thereby reducing the brightness of the display panel. In other words, if the temperature sensing voltage received by the control circuit MC meets the first condition during time period t, then during time period t+1 (the next time period after t), the duty cycle of the first dimming signal in time period t+1 is smaller than the duty cycle of the first dimming signal in time period t. If the duty cycle of the first dimming signal in time period t+1 is defined as the first duty cycle, and the duty cycle in time period t is defined as the second duty cycle, then the first duty cycle is smaller than the second duty cycle. Alternatively, the second dimming signal ADJ can be updated so that the voltage of the updated second dimming signal ADJ is lower than the voltage of the original second dimming signal ADJ, thereby reducing the brightness of the display panel. In other words, during time period t, if the temperature-sensing voltage received by the control circuit MC meets the first condition, then during time period t+1, the voltage of the second dimming signal in time period t+1 is lower than the voltage of the second dimming signal in time period t. If the voltage of the second dimming signal in time period t+1 is defined as the first voltage value, and the duty cycle in time period t is defined as the second voltage value, then the first voltage value is lower than the second voltage value.

[0151] Of course, the first dimming signal PWM and the second dimming signal ADJ can also be updated simultaneously to reduce the brightness of the display panel. For LCD panels, reducing the duty cycle of the first dimming signal PWM and reducing the voltage of the second dimming signal ADJ can both reduce the brightness of the LED light-emitting unit.

[0152] If the control circuit MC determines that the temperature sensing voltage meets the second condition, it updates the first dimming signal PWM, making the duty cycle of the updated first dimming signal PWM greater than the duty cycle of the original first dimming signal PWM, thus increasing the duty cycle and thereby improving the brightness of the display panel. In other words, during time period t, if the temperature sensing voltage received by the control circuit MC meets the second condition, then during time period t+1, the duty cycle of the first dimming signal PWM in time period t+1 is greater than the duty cycle of the first dimming signal PWM in time period t; that is, the first duty cycle is greater than the second duty cycle. Alternatively, the second dimming signal ADJ can be updated, making the voltage of the updated second dimming signal ADJ greater than the voltage of the original second dimming signal ADJ, thereby improving the brightness of the display panel. In other words, during time period t, if the temperature sensing voltage received by the control circuit MC meets the second condition, the voltage of the second dimming signal ADJ in time period t+1 is greater than the voltage of the second dimming signal ADJ in time period t; that is, the first voltage value is greater than the second voltage value.

[0153] Of course, the first dimming signal PWM and the second dimming signal ADJ can also be updated simultaneously to increase the brightness of the display panel. For LCD panels, increasing the duty cycle of the first dimming signal PWM and increasing the voltage of the second dimming signal ADJ can both increase the brightness of the LED light-emitting unit.

[0154] It should be noted that the durations of the aforementioned time periods t and t+1 are not fixed values, but rather refer to the durations of images with different brightness levels. When the control circuit MC determines that the temperature sensing voltage meets either the first or second condition, time period t ends and time period t+1 begins. During time period t+1, the temperature sensing voltage continues to be monitored, and when it is determined again that the first or second condition is met, time period t+1 ends. In other words, the durations of time periods t and t+1 depend on the timing of determining that the temperature sensing voltage meets the first or second condition; while during the determination process, the current brightness is maintained.

[0155] The following is a detailed explanation of the above-mentioned scheme for adjusting the brightness of the display module based on temperature-sensing voltage:

[0156] In some embodiments of this disclosure, such as Figure 1 and Figure 2 As shown, the sensing voltage can be the average value of the voltages collected through the first sampling input terminal ADC1 within a specified sampling period. This sampling period can be 1 second, 3 seconds, 5 seconds, etc., and within the sampling period, the voltage of the sensing trace PTC can be collected m times, with the time interval between two adjacent collections not less than i milliseconds; m and i are both integers and greater than 1. The average value of all voltages collected within the sampling period can be considered as a single sensing voltage. For example, the sampling period can be 1 second, 2 seconds, 3 seconds, 4 seconds, etc., where m is not less than 1000 and i is greater than 1.

[0157] In some embodiments of this disclosure, based on the aforementioned temperature-sensing voltage, the first and second conditions not only include determining the magnitudes of the temperature-sensing voltage and the first and second thresholds, but also include determining the duration of the relationship between the temperature-sensing voltage and the first and second thresholds. Specifically:

[0158] The first condition includes: the temperature sensing voltage is continuously greater than the first threshold for a specified first temperature sensing duration; that is, within the first temperature sensing duration, the temperature sensing voltage is always greater than the first threshold, and there is no temperature sensing voltage less than or equal to the first threshold.

[0159] The second condition includes: the duration for which the sensing voltage is consistently less than the second threshold reaches the second sensing duration; that is, within the second sensing duration, the sensing voltage is always less than the second threshold, and there has never been a sensing voltage greater than or equal to the second threshold.

[0160] The first sensing duration is less than or equal to the second sensing duration. Since the first threshold is greater than the second threshold, if the sensing voltage is greater than the first threshold, it indicates a high temperature requiring timely cooling; therefore, the first sensing duration should not be too long. Conversely, if the sensing voltage is less than the second sensing duration, it indicates a low temperature with no risk of overheating; therefore, the second sensing duration can be greater than or equal to the first sensing duration. The first and second sensing durations can be 3 minutes, 5 minutes, 10 minutes, etc., which helps prevent excessively frequent changes in the brightness of the display panel, causing flickering that affects visual effects. For example, the second sensing duration is 10 minutes, and the first sensing duration is 5 minutes. Of course, in some implementations, the first and second sensing durations can be equal, for example, both being 5 minutes.

[0161] The duration for which the sensing voltage remains above the first threshold can be determined based on the aforementioned sampling duration. Specifically, if a sensing voltage greater than the first threshold is obtained n times consecutively, the duration is increased by n sampling durations. The cumulative value of these n sampling durations is the duration for which the sensing voltage remains above the first threshold. If this cumulative value reaches the preset first sensing duration, the first condition is considered satisfied. Conversely, if a sensing voltage less than the first threshold occurs during this period, the duration for which the sensing voltage remains above the first threshold is reset to zero, and the timing restarts from the next occurrence of a sensing voltage greater than the first threshold. For example, if the sampling duration is 3 seconds and the first sensing duration is 10 minutes, then for each sensing voltage greater than the first threshold obtained, the duration for which the sensing voltage is greater than the first threshold increases by 3 seconds. Without any instance of a sensing voltage less than or equal to the first threshold, the first sensing duration reaches 10 minutes when a sensing voltage greater than the first threshold is obtained for the 200th consecutive time. At this point, the sensing voltage satisfies the first condition. If the temperature sensing voltage obtained in the third measurement is less than the temperature sensing voltage of the first threshold, the duration of the temperature sensing voltage being greater than the first threshold is reset to zero, and the timing restarts from the temperature sensing voltage obtained in the fourth measurement.

[0162] Based on the above judgment method, since the duration of the temperature sensing voltage being continuously greater than the first threshold may be reset to zero, the duration of time period t and time period t+1 may be greater than the first temperature sensing duration. That is, since the duration of the temperature sensing voltage being continuously greater than the first threshold has never reached the first temperature sensing duration, the brightness of the display module is not adjusted, and time period t or time period t+1 continues.

[0163] When determining whether the temperature sensing voltage meets the second condition, it is determined whether the duration for which the temperature sensing voltage is continuously less than the second threshold reaches the second temperature sensing duration. If there is a case where the voltage is greater than or equal to the second threshold, the duration is also reset to zero, and the accumulation starts again from the next time the voltage is less than the second threshold. The specific principle of the second temperature sensing is the same as the determination of the first condition mentioned above, and will not be described in detail here.

[0164] The duration for which the sensing voltage remains above a first threshold or below a second threshold can be determined using timers. For example, timer 1 can be used to time and reset the duration for which the sensing voltage remains above the first threshold; timer 2 can be used to time and reset the duration for which the sensing voltage remains below the second threshold. Both timers 1 and 2 can be integrated into the control circuit MC. However, since the first and second conditions cannot be satisfied simultaneously, as the duration for which the sensing voltage remains above the first threshold increases, the duration for which the sensing voltage remains below the second threshold must be reset to zero. Therefore, a single timer can be used to implement the functions of both timers 1 and 2.

[0165] In other embodiments of this disclosure, the sensing voltage may also be the average value of voltage values ​​obtained within a specified sensing duration; correspondingly, the first condition is that the average value of the sensing voltage obtained within the first sensing duration is greater than a first threshold; the second condition may be that the average value of the sensing voltage obtained within the second sensing duration is less than a second threshold. The durations of the time periods t and t+1 mentioned above may be this sensing duration.

[0166] It should be noted that the voltage obtained by the control circuit MC from the temperature sensing line PTC is an analog signal. In order to facilitate logical judgment, it can be converted into a digital signal, but the converted value can still be regarded as the temperature sensing voltage.

[0167] The following is an example illustrating how to adjust the brightness of the LED light-emitting unit:

[0168] The first adjustment method

[0169] When adjusting the duty cycle of the first dimming signal, a fixed amplitude can be increased or decreased. For example, each time the first adjustment value is increased or the second adjustment value is decreased, the first and second adjustment values ​​can be equal, for example, both can be 10%. Of course, the first and second adjustment values ​​can also be unequal. Alternatively, the amplitude of the duty cycle adjustment can be determined based on the relationship between the temperature sensing voltage and the first and second thresholds, achieving continuous adjustment or adjustment at different amplitudes in intervals. An example is provided below:

[0170] In some embodiments of this disclosure, the control circuit MC increases or decreases the duty cycle of the first dimming signal by a fixed amount, i.e., each time the first adjustment value is increased or the second adjustment value is decreased.

[0171] If the control circuit MC determines that the temperature sensing voltage meets the first condition and the duty cycle of the first dimming signal is greater than the first adjustment value, it reduces the duty cycle of the first dimming signal PWM by the first adjustment value to obtain an updated first dimming signal PWM. That is, in time period t, if the temperature sensing voltage meets the first condition and the duty cycle of the first dimming signal PWM is greater than the first adjustment value, then in stage t+1, the difference between the duty cycle of the first dimming signal PWM and the duty cycle in time period t is the first adjustment value; in other words, if the adjustable range is not less than the first adjustment value, it is further reduced by the first adjustment value.

[0172] If the temperature meets the first condition and the duty cycle of the first dimming signal PWM is not greater than the first adjustment value, a backlight off signal is output to turn off the LEDs, stopping them from emitting light. In other words, during time period t, if the temperature sensing voltage meets the first condition and the duty cycle of the first dimming signal PWM is not greater than the first adjustment value, then during time period t+1, the control circuit MC outputs a backlight off signal to turn off the LEDs. Simultaneously, since the LEDs are already off, there is no need to turn on the display panel. Therefore, the power management circuit PMIC can be controlled by outputting the power control signal PMIC_EN through the power control terminal GPIO1 to stop supplying power to the gate drive circuit GOA, the timing control circuit TCON, and the source drive circuit SIC, thereby turning off the display panel.

[0173] If the control circuit MC determines that the temperature sensing voltage meets the second condition and the duty cycle of the first dimming signal PWM is less than the difference between 100% and the second adjustment value, it increases the duty cycle of the first dimming signal PWM by the second adjustment value to obtain the updated first dimming signal PWM. That is, in time period t, if the temperature sensing voltage meets the second condition and the duty cycle of the first dimming signal PWM is less than the difference between 100% and the second adjustment value, then in time period t+1, the difference between the duty cycle of the first dimming signal PWM and the duty cycle in time period t is the second adjustment value. In other words, if the adjustable range is not less than the second adjustment value, it is then increased by the second adjustment value.

[0174] If the temperature sensing voltage meets the second condition, and the duty cycle of the first dimming signal PWM is greater than the difference between 100% and the second adjustment value, then the duty cycle of the first dimming signal PWM is increased to 100%, resulting in an updated first dimming signal PWM, which can adjust the brightness of the LED to its maximum. That is, in time period t, if the temperature sensing voltage meets the second condition, and the duty cycle of the first dimming signal is greater than the difference between 100% and the second adjustment value, then in time period t+1, the duty cycle of the first dimming signal is 100%. The aforementioned 100% is the maximum value of the duty cycle.

[0175] In some embodiments of this disclosure, if the voltage of the second dimming signal ADJ is adjusted, the adjustment range can also be a fixed range. The specific adjustment method can be referred to the duty cycle adjustment method of the first dimming signal PWM in the first embodiment above, which will not be described in detail here.

[0176] If the temperature sensing voltage is not greater than the first threshold and not less than the second threshold, it means that there is no need to reduce the brightness in order to cool down. Therefore, the brightness of the LED light-emitting unit remains unchanged, that is, the control circuit MC does not adjust its brightness to avoid excessively frequent flickering.

[0177] The second adjustment method

[0178] The duty cycle adjustment of the first dimming signal can vary linearly, rather than being a fixed amplitude. For example:

[0179] In some embodiments of this disclosure, if the control circuit determines that the temperature sensing voltage meets the first condition, it reduces the duty cycle of the first dimming signal PWM by a first adjustment value to obtain an updated first dimming signal; that is, if the temperature sensing voltage meets the first condition during time period t, then the difference between the duty cycle of the first dimming signal PWM and the duty cycle during time period t+1 is the first adjustment value.

[0180] When the temperature sensing voltage meets the second condition, the duty cycle of the first dimming signal is increased by the second adjustment value to obtain the updated first dimming signal; that is, if the temperature sensing voltage meets the second condition during time period t, then the difference between the duty cycle of the first dimming signal and the duty cycle of time period t+1 is the second adjustment value.

[0181] The first adjustment value satisfies the following relationship:

[0182] Y1 = [(TH-X) / CA] × 100%;

[0183] The second adjustment value satisfies the following relationship:

[0184] Y2 = [(TL-X) / C+B]×100%;

[0185] Y1 is the first adjustment value, TH is the first threshold, X is the temperature sensing voltage, TL is the second threshold, C is the temperature corresponding to the temperature rise of the display panel surface caused by light emission in the temperature-voltage conversion relationship, A is the minimum amount of decreasing the duty cycle, B is the minimum amount of increasing the duty cycle, and C, A, and B are constants that can be preset based on empirical data and experimental data.

[0186] In some implementations, based on the temperature-voltage conversion relationship, temperature and voltage have a one-to-one correspondence and a linear relationship. Therefore, calculating the first adjustment value using temperature and the voltage corresponding to that temperature is the same, and calculating the second adjustment value using temperature and the voltage corresponding to that temperature is the same. For ease of understanding, the following example uses temperature to represent its corresponding voltage:

[0187] The first threshold TH is 78℃; the second threshold TL is 74℃; the temperature corresponding to C is 25℃, A = 0.05, B = 0.1, and the temperature sensing time is 5 minutes.

[0188] For example, if the temperature of the display panel remains at 76°C for 5 minutes (i.e., X = 76°C, TH ≥ X ≥ TL), then the first dimming signal PWM does not need to be updated. The brightness of the light-emitting unit remains unchanged.

[0189] When the display panel temperature remains above 78℃ for 5 minutes, and reaches 83℃ in the 5th minute; X = 83℃, X > TH, Y1 = (78-83) / 25 - 0.05 = -25%. The first adjustment value is -25%, meaning the duty cycle of the first dimming signal PWM is reduced by 25%. If the duty cycle of the first dimming signal PWM is 100% at this time, it can be reduced to 75%.

[0190] When the display panel temperature remains below 74℃ for 5 minutes, and reaches 68℃ in the 5th minute, X = 68℃, X < TL, Y2 = (74-68) / 25 + 0.1 = 34%, the adjustment range of the first dimming signal is increased by 34%. The increase in the duty cycle of the first dimming signal PWM, i.e., the second adjustment value, is 34%. If the duty cycle of the first dimming signal PWM is 40% at this time, it can be increased to 75%. If the duty cycle of the first dimming signal PWM is 75%, it can be increased to 100%, and will not change after reaching the upper limit of 100%.

[0191] In some embodiments of this disclosure, if the voltage of the second dimming signal ADJ is adjusted, the adjustment range may also change linearly rather than being a fixed range. The specific adjustment method can be referred to the duty cycle adjustment method of the first dimming signal PWM in the second embodiment described above, which will not be described in detail here.

[0192] If the temperature sensing voltage is not greater than the first threshold and not less than the second threshold, it means that there is no need to reduce the brightness in order to cool down. Therefore, the brightness of the LED light-emitting unit remains unchanged, that is, the control circuit does not adjust its brightness to avoid excessively frequent flickering.

[0193] The third adjustment method

[0194] The duty cycle and voltage of the first dimming signal PWM can be adjusted in segments, meaning that the adjustment range of the duty cycle and voltage varies when the temperature sensing voltage is in different ranges; for example:

[0195] In some embodiments of this disclosure, the first condition includes a temperature-sensing voltage that is continuously greater than a first threshold and less than a third threshold for a duration equal to the temperature-sensing duration, and less than the third threshold; the third threshold is greater than the first threshold. The principle for determining whether this duration has reached the temperature-sensing duration is the same as the principle for determining whether the duration of the temperature-sensing voltage continuously greater than the first threshold has reached the temperature-sensing duration, i.e., if the temperature-sensing voltage is greater than the first threshold and less than the third threshold, the duration is increased by one sampling duration; if it is less than the first threshold or not less than the third threshold, the duration is reset to zero, and the first condition is considered to be satisfied when the duration reaches the temperature-sensing duration, which will not be described in detail here.

[0196] If the temperature sensing voltage meets the first condition, the difference between the duty cycle of the updated first dimming signal and the duty cycle of the original first dimming signal is the first duty cycle difference. That is, in time period t, if the temperature sensing voltage meets the first condition, the difference between the duty cycle of the first dimming signal in time period t+1 and the duty cycle in time period t is the first duty cycle difference.

[0197] The control circuit can update the first dimming signal when the temperature sensing voltage meets the third condition. The duty cycle of the updated first dimming signal is less than the duty cycle of the original first dimming signal. In other words, if the temperature sensing voltage meets the third condition during time period t, then the duty cycle of the first dimming signal is less than the duty cycle of the first dimming signal during time period t+1. The third condition may include the duration for which the temperature sensing voltage is continuously not less than a third threshold, which is the temperature sensing duration.

[0198] When the temperature sensing voltage meets the third condition, the difference between the duty cycle of the updated first dimming signal and the duty cycle of the original first dimming signal is the second duty cycle difference, that is, the difference between the duty cycle of the first dimming signal in time period t+1 and the duty cycle in time period t is the second duty cycle difference.

[0199] The second duty cycle difference can be greater than the first duty cycle difference. That is, when the third condition is met, the reduction in the duty cycle of the first dimming signal is greater than the reduction in the duty cycle when the first condition is met. In other words, when the temperature sensing voltage is greater than or equal to the third threshold, the reduction in brightness of the display panel is greater than the reduction in brightness when the temperature is between the first and third thresholds.

[0200] In some embodiments, the first threshold corresponds to a temperature less than 80°C and not less than 78°C in the above temperature-voltage conversion relationship; the second threshold corresponds to a temperature not greater than 75°C in the above temperature-voltage conversion relationship; and the third threshold corresponds to a temperature not less than 80°C and not greater than 85°C in the above temperature-voltage conversion relationship. For example, the first threshold corresponds to a temperature of 78°C in the above temperature-voltage conversion relationship; the second threshold corresponds to a temperature of 75°C in the above temperature-voltage conversion relationship; and the third threshold corresponds to a temperature of 84°C in the above temperature-voltage conversion relationship. That is to say, if the temperature of the display panel exceeds 84°C, the brightness can be significantly reduced; if the temperature is greater than 78°C and less than 84°C, the brightness can be reduced slightly; and if the temperature is less than 75°C, the brightness can be increased. The reason why the temperature corresponding to the third threshold in the above temperature-voltage conversion relationship is 84°C is that the inventors found that the polarizer of the display device ages much faster and its lifespan is significantly shortened after the temperature exceeds 85°C, so it is necessary to reduce the temperature as soon as possible. 84°C is slightly lower than 85°C, which can leave a margin for detection error and response time.

[0201] Furthermore, in some embodiments of this disclosure, the control circuit can reduce the duty cycle of the first dimming signal by a third adjustment value when the temperature sensing voltage meets the first condition described above, thereby obtaining an updated first dimming signal; that is, if the temperature sensing voltage meets the first condition during time period t, then the difference between the duty cycle of the first dimming signal and the duty cycle during time period t+1 is the third adjustment value; the third adjustment value satisfies the following relationship:

[0202] Y3 = [(TH-X) / CE] × 100%;

[0203] When the temperature sensing voltage meets the third condition, the duty cycle of the first dimming signal is reduced by the fourth adjustment value to obtain the updated first dimming signal. During time period t, if the temperature sensing voltage meets the fourth condition, then during time period t+1, the difference between the duty cycle of the first dimming signal and the duty cycle during time period t is the fourth adjustment value. The fourth adjustment value satisfies the following relationship:

[0204] Y4=[(TM-X)×K / CF]×100%;

[0205] Y3 is the third adjustment value, Y4 is the fourth adjustment value, TH is the first threshold, TM is the third threshold, X is the temperature sensing voltage, C is the temperature sensing voltage corresponding to the temperature rise of the display panel surface caused by light emission in the above temperature-voltage conversion relationship, E is the preset minimum reduction of duty cycle, F is the magnitude greater than E, and K, E and F are all constants, and 1 < K < 4; for example, 2 < K < 3, further, K = 2.54.

[0206] In some implementations, for ease of calculation, the corresponding voltage can be expressed in terms of temperature. Therefore, TH = 78°C, TM = 84°C, C = 25°C, E = 0.05, and F = 0.29.

[0207] When the temperature of the display panel rises and remains above 78℃ for 5 minutes, reaching 82℃ at the 5-minute mark, X = 82℃, 84 > X > TH, Y3 = (78-82) / 25 - 0.05 = -21%, meaning the duty cycle adjustment of the first dimming signal is reduced by 21%. If the duty cycle of the first dimming signal is 100% at this point, it needs to be reduced to 79%.

[0208] When the display panel temperature rises and remains above 78℃ for 5 minutes, reaching 86℃ in the 5th minute, when X = 88℃, and X ≥ 84, Y4 = (84-86) × 2.54 / 25 - 0.29 = -34.82%. The duty cycle adjustment of the first dimming signal is a reduction of 34.82%. If the duty cycle of the first dimming signal is 100% at this point, it needs to be reduced to 65.18%. If the duty cycle of the first dimming signal is 79% at this point, it needs to be reduced to 44.18%. If the duty cycle of the first dimming signal is 40% at this point, the duty cycle is reduced to 10%, reaching the lower limit of 10% for the duty cycle of the first dimming signal, and then no longer reduced.

[0209] In some embodiments of this disclosure, the control circuit MC can update the second dimming signal ADJ when the temperature sensing voltage meets the third condition, and the voltage of the updated second dimming signal ADJ is less than the voltage of the original second dimming signal. The first voltage difference is defined as the difference between the voltage of the updated second dimming signal and the voltage of the original second dimming signal when the temperature sensing voltage meets the first condition; that is, in time period t, if the temperature sensing voltage meets the first condition, the voltage difference of the second dimming signal in time period t+1 and the voltage in time period t is the first voltage difference. The second voltage difference is defined as the difference between the voltage of the updated second dimming signal and the voltage of the original second dimming signal when the temperature meets the third condition; that is, in time period t, if the temperature sensing voltage meets the third condition, the voltage difference of the second dimming signal in time period t+1 and the voltage in time period t is the second voltage difference.

[0210] The second voltage difference can be greater than the first voltage difference. That is, when the third condition is met, the voltage reduction of the second dimming signal is greater than the voltage reduction when the first condition is met. In other words, when the temperature sensing voltage is greater than the third threshold, the brightness reduction of the display panel is greater than the brightness reduction when the temperature is between the first and third thresholds. The selection of the third threshold can be referred to the above, and will not be repeated here.

[0211] In the embodiments of this disclosure, the above-mentioned methods for adjusting the duty cycle of the first dimming signal and the voltage of the second dimming signal can be used selectively or simultaneously.

[0212] If the temperature sensing voltage is not greater than the first threshold and not less than the second threshold, it means that there is no need to reduce the brightness in order to cool down. Therefore, the brightness of the light-emitting unit remains unchanged, that is, the control circuit does not adjust its brightness to avoid excessively frequent flickering.

[0213] The aforementioned function of adjusting the brightness of the light-emitting unit based on the temperature-sensing voltage can be defined as a self-protection mechanism. The control circuit MC may include a power supply terminal GPIO0, which can receive a constant voltage signal or a pulse control signal CTRL_EN. When the power supply terminal GPIO0 is at a high level, the self-protection mechanism can be activated. At this time, the brightness of the light-emitting unit is adjustable and the temperature-sensing voltage can be processed. If the power supply terminal GPIO0 is at a low level, the control circuit MC will no longer process the temperature-sensing voltage, and the brightness of the light-emitting unit will not change.

[0214] The inventors also discovered that different display panels detected different temperatures under the same ambient temperature, meaning the obtained temperature-sensing voltages varied. This led to inconsistent brightness adjustments across different display devices, resulting in differences in temperature control. Analysis revealed that this was due to limitations such as manufacturing process errors, causing discrepancies between the dimensions of the temperature-sensing traces in some display panels and the standard dimensions. During pre-shipment testing, all display panels were subjected to the same ambient temperature. However, the temperature-sensing voltage obtained by the control circuit through the first sampling input terminal ADC1 was not the standard temperature-sensing voltage. The preset temperature-voltage conversion relationship in the display panel was based on the standard temperature-sensing voltage and the ambient temperature. If the temperature was determined based on this conversion relationship and the measured temperature-sensing voltage, there would be a significant difference between this temperature and the ambient temperature (during testing, the temperature should be equal to the ambient temperature within a certain error range). For example, if the ambient temperature was 25°C, the temperature corresponding to the measured temperature-sensing voltage of the display panel would be 23°C, affecting the accuracy of temperature control.

[0215] To address this, the inventors propose that the temperature-voltage conversion relationship stored in each display device can be calibrated before it leaves the factory. Based on the dimensions of the temperature-sensing traces on each display panel, the temperature-voltage conversion relationship can be determined. This will be explained in detail below:

[0216] Under a specified ambient temperature, the control circuit acquires the temperature-sensing voltage through the first sampling input terminal. Correspondingly, based on a preset temperature-voltage conversion relationship, the corresponding temperature can be determined as the detection temperature. If the detection temperature differs from the specified ambient temperature, the detection temperature corresponding to the temperature-sensing voltage in the original temperature-voltage conversion relationship can be modified to the specified ambient temperature. Since temperature and voltage have a linear relationship in the temperature-voltage conversion relationship, after the temperature corresponding to the current temperature-sensing voltage is redefined, the temperature-voltage conversion relationship can be updated accordingly as the new temperature-voltage conversion relationship for the display panel and stored in the memory FL or other circuits with storage functions for the control circuit MC to retrieve. Of course, the control circuit MC can also have a storage function. For example, in a temperature-voltage conversion relationship, the temperature difference between two voltages is fixed. If one of the two temperatures is updated, the other can also be updated, but the temperature difference remains unchanged. For instance, in the original temperature-voltage conversion relationship, a voltage of 3.2V corresponds to 74℃ and a voltage of 3.3V corresponds to 76℃. During correction, the temperature corresponding to a voltage of 3.2V is adjusted to 75℃, so in the new temperature-voltage conversion relationship, a voltage of 3.3V corresponds to 77℃.

[0217] If the temperature sensing voltage can be determined to be equal to the specified ambient temperature based on the preset temperature-voltage conversion relationship (within a specified range of error), then the aforementioned correction and update actions will not be performed.

[0218] The inventors also discovered that the voltage supplied by the power management circuit PMIC to the temperature sensing input terminal TI of the temperature sensing trace PTC is not absolutely stable but fluctuates. Even with a constant ambient temperature, this fluctuation can cause changes in the sensing voltage. If the fluctuation is large, it can lead to incorrect temperature detection. Therefore, the inventors proposed that the voltage fluctuation can be judged by comparing the difference between the voltage at the temperature sensing input terminal TI and the temperature sensing output terminal TO of the temperature sensing trace. If the fluctuation is too large, the display panel is considered defective; if the fluctuation is small, it is considered a good product. Specifically:

[0219] The control circuit may also include a second sampling input terminal ADC2. The power control terminal GPIO1 and the second sampling input terminal ADC2 are used to receive power and can be electrically connected to the temperature sensing input terminal TI of the temperature sensing trace PTC. The drive circuit also includes a second voltage divider resistor R3 and a third voltage divider resistor R4, which are connected in series between a constant potential terminal and the input terminal of the temperature sensing trace PTC to achieve voltage division. The second sampling input terminal ADC2 is electrically connected between the second voltage divider resistor R3 and the third voltage divider resistor R4, thereby obtaining the voltage obtained after voltage division of the input voltage of the temperature sensing trace PTC. This voltage can be provided by the power management circuit PMIC. The resistance values ​​of the second voltage divider resistor R3 and the third voltage divider resistor R4 can be the same, so that the voltage obtained by the second sampling input terminal ADC2 should be half of the power supply voltage of the power management circuit PMIC.

[0220] The temperature-sensing voltage obtained from the first sampling input terminal ADC1 can be used as the first voltage, and the temperature corresponding to the voltage obtained from the second sampling input terminal can be used as the second voltage. Of course, based on the above temperature-voltage conversion relationship, the first voltage can correspond to a first temperature, and the second voltage can correspond to a second temperature.

[0221] Under a specified ambient temperature, the control circuit MC compares a first voltage and a second voltage. If the first voltage is not greater than k1 times the second voltage and not less than k2 times the second voltage, the display panel is considered good and can undergo normal calibration, i.e., the first voltage is calibrated to the specified ambient temperature, and the temperature-voltage conversion relationship is updated accordingly. If the first voltage is greater than k1 times the second voltage or less than k2 times the second voltage, the display panel is considered defective, and no calibration is performed. Here, 1 < k1 < 2, 0 < k2 < 1, for example, k1 = 1.6, k2 = 0.4; the specific values ​​of k1 and k2 can be obtained based on tests of the display panel combined with empirical data. It can be seen that as long as the first voltage does not exceed 1.6 times the second voltage and is not less than 0.4 times the second temperature, the display panel can be considered good.

[0222] In addition, such as Figure 1 As shown, in some embodiments of this disclosure, the display module further includes a calibration switch S, and the control circuit MC may also include a calibration switch terminal ADJUST, which can be electrically connected to the calibration switch S. The calibration switch S can be a toggle switch, push-button switch, etc., and its specific type is not limited herein. By opening and closing the calibration switch S, the voltage of the calibration switch terminal ADJUST of the control circuit can change (e.g., switching between high and low levels); and when the calibration switch S is closed, the control circuit MC begins the aforementioned temperature calibration operation, and when the calibration switch S is open, the aforementioned calibration operation is not performed.

[0223] To facilitate indication of the working status, in some embodiments of this disclosure, the driving circuit may further include a first indicator circuit. The first indicator circuit includes a first indicator light LEDG of a first color. The first indicator light LEDG may be a light-emitting diode or other light-emitting element, and it may be electrically connected to the first indicator terminal of the control circuit MC. The first indicator light LEDG may be disposed on the same circuit board as the control circuit MC, or it may be disposed in other places such as the housing of the display device.

[0224] The control circuit MC can control the first indicator LEDG to flash during the process of acquiring the first voltage, comparing the first voltage with the second voltage, and updating the temperature-voltage conversion relationship. The flashing frequency is not specifically limited here, to remind the user that the current state is in detection and calibration.

[0225] After the temperature-voltage conversion relationship is updated, the control circuit MC can keep the first indicator LEDG lit instead of flashing, indicating to the user that the calibration is complete and the device can work normally.

[0226] Furthermore, the driving circuit may also include a second indicator circuit, which includes a second indicator LEDR of a second color, different from the first color; for example, the first color is green and the second color is red. The second indicator LEDR may be a light-emitting diode or other light-emitting element, and it may be electrically connected to the second indicator terminal of the control circuit MC. The first indicator LEDG may be located on the same circuit board as the control circuit MC, and the second indicator LEDR may be located in other places such as the casing of the display device.

[0227] The control circuit MC can keep the second indicator LEDR lit when the first voltage is greater than k1 times the second voltage or less than k2 times the second voltage. In other words, the second indicator LEDR can be used to indicate to the user that the display panel is defective.

[0228] like Figure 1 , Figure 2 and Figure 15 As shown, in some embodiments of this disclosure, the first indicator circuit may include a first indicator light LEDG, a switching element Q3, a resistor R6, and a resistor R7, wherein:

[0229] The first indicator LEDG can be a light-emitting diode. Its first terminal can be electrically connected to the control circuit MC, the power management circuit PMIC, or other power-supplying circuits. Its second terminal can be electrically connected to the first terminal of the switching element Q3 through resistor R6. The control terminal of the switching element Q3 can be electrically connected to the first indicator terminal LG of the control circuit MC through resistor R7. The second terminal of the switching element Q3 can be grounded or at another constant potential. The switching element Q3 can be a transistor. The control circuit MC outputs a first indicator signal LED_G, which turns on the switching element Q3 and illuminates the first indicator LEDG. By adjusting the first indicator signal LED_G, the first indicator LEDG can be switched to flashing or constant-on states.

[0230] The second indicator circuit includes a second indicator light LEDR, a switching element Q4, resistors R9 and R10, wherein:

[0231] The second indicator LEDR can be a light-emitting diode. Its first terminal can be electrically connected to the control circuit MC, the power management circuit PMIC, or other power-supplying circuits. Its second terminal can be electrically connected to the first terminal of the switching element Q4 through resistor R8. The control terminal of the switching element Q4 can be electrically connected to the control circuit MC through resistor R9. The second terminal of the switching element Q4 can be grounded or at another constant potential. The switching element Q4 can be a transistor. The second indicator signal LED_R can be output through the second indicator terminal LR of the control circuit MC to turn on the switching element Q4 and light up the second indicator LEDR. By adjusting the second indicator signal LED_R, the second indicator LEDR can be made to flash or remain constantly lit.

[0232] An external power supply can power the control circuit MC through the power management circuit PMIC; alternatively, it can power the control circuit MC without the power management circuit PMIC, so that the control circuit MC can still perform the aforementioned temperature detection and calibration functions even when the power management circuit PMIC is powered off. An example is provided below:

[0233] In some embodiments of this disclosure, such as Figure 1 and Figure 2 As shown, the power management circuit PMIC is electrically connected to the control circuit MC and the temperature sensing output terminal TO of the temperature sensing trace PTC. The PMIC powers the control circuit MC and the temperature sensing trace PTC, and can be powered by an external power supply. The control circuit MC has a power control terminal GPIO1, which can be electrically connected to the control terminal EN of the power management circuit PMIC. GPIO1 outputs a power control signal PMIC_EN to enable the power management circuit PMIC to control the display panel to start and stop.

[0234] For example, such as Figure 3 and Figure 5 As shown, the external power supply can provide a 12V voltage VIN, which the power management circuit PMIC can convert into a 0-3.3V power supply voltage VCC to power the input terminals of the control circuit MC and the temperature sensing trace PTC. Simultaneously, it can also be converted into DVDD_3V3 / 1V8 / 1V2 voltages and supplied to the timing control circuit TCON; converted into VGH, VGL, and LVGL voltages and supplied to the gate drive circuit GOA; and converted into AVDD and HAVDD voltages and supplied to the source drive circuit SIC. If the power control signal PMIC_EN is high, the power management circuit PMIC normally supplies power to the display panel, enabling the display panel to start; if the power control signal PMIC_EN is low, the power management circuit PMIC does not output the aforementioned DVDD_3V3 / 1V8 / 1V2, VGH, VGL, LVGL, AVDD, and HAVDD voltages, causing the display panel to turn off.

[0235] like Figure 7 and Figure 11 As shown, in some embodiments of this disclosure, the power control terminal GPIO1 of the control circuit MC is electrically connected to the control terminal EN of the power management circuit PMIC; the power control terminal GPIO1 outputs a power control signal PMIC_EN that causes the power management circuit PMIC to control the display panel to start and stop. Simultaneously, the drive circuit also includes a first switching element Q1 and a power supply circuit BU; the first switching element Q1 has a control electrode, a first electrode, and a second electrode, and the first and second electrodes can be turned on by controlling the signal of the control electrode. The control electrode of the first switching element Q1 is electrically connected to the power control terminal GPIO1, the first electrode is electrically connected to an external power supply, and the second electrode is electrically connected to the power management circuit PMIC. The first switching element Q1 can be turned on and off under the control of the power control signal output by the power control terminal GPIO1, thereby turning the external power supply on or off the power terminal VIN of the power management circuit PMIC; thus, the control circuit MC can control the power supply and power-off of the power management circuit PMIC through the first switching element Q1, thereby controlling the start and stop of the display panel.

[0236] The power supply circuit SU can be electrically connected to an external power source and the control circuit MC. The external power source can supply power to the control circuit MC through the power supply circuit BU, instead of the power management circuit PMIC. Even if the power management circuit PMIC is powered off, the control circuit MC can still operate normally. The power supply circuit BU can use a BUCK circuit (step-down converter circuit).

[0237] Furthermore, such as Figure 7 and Figure 11As shown, the driving circuit may further include a second switching element Q2. The second switching element Q2 has a control electrode, a first electrode, and a second electrode. The first and second electrodes can be turned on by controlling the signal at the control electrode. The control electrode of the second switching element Q2 is electrically connected to the power control terminal GPIO1, the first electrode is grounded or electrically connected to another constant potential signal, and the second electrode is electrically connected to the control electrode of the first switching element Q1. The second switching element Q2 can be turned on first by the power control signal, causing the control electrode of the first switching element Q1 to be short-circuited to a constant potential and thus turned on.

[0238] For example, the first switching element Q1 can be a P-type MOSFET, and the second switching element Q2 can be an NPN transistor. The external power supply is supplied through the VIN terminal, and the supply voltage can be 12V. The power control signal PMIC_EN output from the power control terminal GPIO1 of the control circuit has a voltage range of 0-3.3V. While the voltage of GPIO1 is insufficient to directly control the first switching element Q1 to conduct, it can control the conduction and cutoff of the second switching element Q2. Specifically, when the power control terminal GPIO1 is high (3.3V), the second switching element Q2 conducts, the control electrode of the first switching element Q1 is short-circuited to ground, and the voltage is 0V, causing the first switching element Q1 to conduct. The power supply terminal VIN of the power management circuit PMIC is then connected to the external power supply. Conversely, when the power control terminal GPIO1 is low (0V), the second switching element Q2 is off, the control electrode and the first electrode of the first switching element Q1 have the same voltage (12V), and the power supply terminal VIN is disconnected from the external power supply. Therefore, the power management circuit PMIC can be powered on and off, i.e., started and shut down, by means of the power control signal PMIC_EN.

[0239] like Figure 1As shown, in some embodiments of this disclosure, the power control terminal GPIO1 of the power management circuit PMIC can exist in two states: high impedance and low impedance (ground), thus failing to output a high-level signal. In this case, an auxiliary resistor Rs can be provided, one end of which is electrically connected to the input terminal of the temperature sensing trace and an output terminal of the power management circuit PMIC, thereby introducing a voltage VCC (e.g., 3.3V). The other end is electrically connected to the control terminal EN of the power management circuit PMIC. To enable the power management circuit PMIC to supply power to the display panel normally, the power control terminal GPIO1 can be set to high impedance. In the high-impedance state, the impedance of the control terminal EN is greater than that of the auxiliary resistor Rs (e.g., 10KΩ). After voltage division through the auxiliary resistor Rs, the voltage of the control terminal EN is close to that of VCC and remains at a high level. If the power control terminal GPIO1 is in a low-impedance state, such as grounded, there is a voltage drop across the auxiliary resistor Rs, causing the control terminal EN to be at a low level. Thus, by switching the voltage VCC in conjunction with the impedance of the power control terminal GPIO1, the high / low level of the control terminal EN is switched, controlling the power management circuit PMIC to supply power to or de-energize the display panel, thereby controlling the start and stop of the display panel. If the control circuit is one in which the power control terminal GPIO1 can output a high-level signal, the high-impedance state mentioned above does not exist. If the power control signal PMIC_EN is high and its voltage is equal to that of VCC, the control terminal EN is high and there is no current in the auxiliary resistor Rs. If the power control signal PMIC_EN is low or grounded, the control terminal EN is low. Thus, the control terminal EN can also be used to start and stop the display panel. In other words, if the auxiliary resistor Rs is set as described above, the power control terminal GPIO1 will not affect the start or stop of the display panel through the power management circuit PMIC, regardless of which of the above situations applies.

[0240] Of course, such as Figure 2 As shown, in some other embodiments of this disclosure, if the power control terminal GPIO1 can output a power control signal PMIC_EN that switches between high and low levels, the aforementioned auxiliary resistor Rs may not be required.

[0241] The following is an exemplary description of the control circuit scheme for controlling the backlight and power management circuit described above:

[0242] For ease of understanding, the accompanying drawings for the first to fifth types of embodiments below are compared with those for... Figure 1 The attached diagram of the display device omits some components or terminals.

[0243] In some implementations of the first category:

[0244] like Figure 3As shown, the control circuit MC has a power control terminal GPIO1, a backlight switch terminal GPIO2, a first dimming control output terminal GPIO3, a power supply terminal GPIO0, and a first sampling input terminal ADC1, wherein:

[0245] The power control terminal GPIO1 is electrically connected to the control terminal EN of the power management circuit PMIC, and can transmit the power control signal PMIC_EN. The backlight switch terminal GPIO2 is electrically connected to the backlight switch input terminal BL of the light emission control circuit BC, and is used to transmit the backlight switch signal BL_ON / OFF. The backlight off signal and backlight on signal mentioned above can be represented by the high and low levels of the backlight switch signal BL_ON / OFF. The first dimming control output terminal GPIO3 is connected to the terminal PW of the light emission control circuit BC, and is used to transmit the first dimming signal PWM.

[0246] The power supply terminal GPIO0 can be connected to a constant power supply voltage VCC through resistor R5. This voltage can be provided by the power management circuit PMIC or the power supply circuit BU. H represents a high level, and L represents a low level. When the power supply terminal GPIO0 = H (high level), the self-protection mechanism is activated. The control circuit detects the temperature sensing voltage and controls the backlight brightness, turns off the backlight, and turns off the display panel. When the power supply terminal GPIO0 = L (low level), the self-protection mechanism is deactivated. The control circuit MC only detects and records the temperature sensing voltage and does not control the LED light-emitting units or the display panel.

[0247] like Figure 4 As shown, in stage T1: the control circuit MC controls PMIC_EN=H, BL_ON / OFF=H, and PWM=H; the power management circuit PM outputs voltages AVDD, VGH, HAVDD, VGL, LVGL, and DVDD_3V3 / 1V8 / 1V2; the light-emitting unit emits light; and the first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel.

[0248] T2 stage: If the temperature corresponding to the sensing voltage remains higher than the temperature corresponding to the first threshold (78℃) for 5 minutes (first sensing time and second sensing time), such as 80℃, then enter the T3 stage.

[0249] T3 stage: The control circuit MC controls the duty cycle of the first dimming signal PWM to decrease by 10%, adjusting it from 100% to 90%; the light emission control circuit BC controls the backlight brightness to decrease by 10%, adjusting it from 100% to 90%. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage is higher than the temperature corresponding to the first threshold (78℃), such as 80℃, for 5 minutes, it enters the T4 stage.

[0250] T4 stage: The control circuit MC controls the duty cycle of the first dimming signal PWM to decrease by 10%, adjusting it from 90% to 80%; the light emission control circuit BC controls the backlight brightness to decrease by 10%, adjusting it from 90% to 80%. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage remains between the temperature corresponding to the first threshold (78℃) and the temperature corresponding to the second threshold (75℃) for 5 minutes, such as 76℃, then enters the T5 stage.

[0251] T5 stage: The control circuit MC keeps the states of GPIO1~3 unchanged. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage is higher than the temperature corresponding to the first threshold (78℃) for 5 minutes, such as 80℃, then enter the T6 stage.

[0252] In stage T6: The control circuit MC reduces the duty cycle of the first dimming signal PWM by 10%, and the light-emitting control circuit BC reduces the backlight brightness by 10%. If the temperature corresponding to the temperature sensing voltage remains higher than the temperature corresponding to the first threshold (78℃) for 5 minutes, such as 80℃, the control circuit MC continues to reduce the duty cycle of the first dimming signal PWM by 10% until it equals 10%; the light-emitting control circuit BC reduces the backlight brightness by 10% until it reaches 10%.

[0253] T7 stage: The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage is higher than the temperature corresponding to the first threshold (78℃) for 5 minutes, such as 80℃, then enter the T8 stage.

[0254] T8: The control circuit MC controls the power supply control signal PMIC_EN = L and the backlight switch signal BL_ON / OFF = L. The power management circuit shuts down the power outputs of AVDD, VGH, HAVDD, VGL, and LVGL, and the light-emitting control circuit BC shuts down the light-emitting unit. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage remains below the temperature corresponding to the second threshold (75℃) for 5 minutes, such as 74℃, then proceed to stage T9.

[0255] T9 stage: The control circuit MC controls the power control signal PMIC_EN = H and the backlight switch signal BL_ON / OFF = H. The power management circuit starts the power output of AVDD, VGH, HAVDD, VGL, and LVGL. The light emission control circuit BC starts the light emission unit, and the backlight brightness is 10%. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage is lower than the temperature corresponding to the first threshold (75℃) for 5 minutes, such as 74℃, then enter the T10 stage.

[0256] During stages T10-T12: The control circuit MC increases the duty cycle of the first dimming signal PWM by 10%, and the light-emitting control circuit BC increases the backlight brightness by 10%. The first sampling input terminal ADC1 detects the temperature-sensing voltage of the display panel. If this temperature remains below the temperature corresponding to the second threshold (74℃) for 5 minutes, for example, if the temperature is 74℃, the control circuit MC increases the duty cycle of the first dimming signal PWM by 10% until it equals 100%; the light-emitting control circuit BC increases the backlight brightness by 10% until it reaches 100%.

[0257] In some implementations of the second category:

[0258] like Figure 5 As shown, the power supply terminal GPIO0 of the control circuit is grounded through resistor R6. The other structures are the same as in the first embodiment and will not be described in detail here. When the power supply terminal GPIO0 = L, the self-protection mechanism is turned off, and the control circuit only detects and records the temperature sensing voltage, without controlling the light-emitting unit and the display panel.

[0259] like Figure 6 As shown, in stage T1: GPIO0 = L, the control circuit MC controls the power control signal PMIC_EN = H, the backlight switch signal BL_ON / OFF = H, the first dimming signal PWM = H, the power management circuit PMIC outputs voltages AVDD, VGH, HAVDD, VGL, LVGL, DVDD_3V3 / 1V8 / 1V2, the light emission control circuit BC controls the light emission unit to light up the backlight, and the first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel.

[0260] During the T2 to T4 phase: The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. Regardless of whether the temperature changes, the control of the control circuit MC remains unchanged, i.e., the power control signal PMIC_EN = H, the backlight switch signal BL_ON / OFF = H, the first dimming signal PWM = H, and the power management circuit PMIC output voltages AVDD, VGH, HAVDD, VGL, LVGL, DVDD_3V3 / 1V8 / 1V2.

[0261] In some implementations of the third category:

[0262] like Figure 7 As shown, the driving circuit includes the first switching element Q1 and the second switching element Q2 mentioned above. Other details can be found in the above-described implementation of the first switching element Q1 and the second switching element Q2, as well as the second implementation described above. These details will not be repeated here.

[0263] like Figure 8As shown, in stage T1: the control circuit MC controls PMIC_EN=H, BL_ON / OFF=H, and PWM=H; the power management circuit PM outputs voltages AVDD, VGH, HAVDD, VGL, LVGL, and DVDD_3V3 / 1V8 / 1V2; the light-emitting unit emits light (LED lights up); the first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. The first switching element Q1 and the second switching element Q2 are turned on.

[0264] T2 stage: If the temperature corresponding to the sensing voltage remains higher than the temperature corresponding to the first threshold (78℃) for 5 minutes, such as 80℃, then enter the T3 stage.

[0265] T3 stage: The control circuit MC controls the duty cycle of the first dimming signal PWM to decrease by 10%, adjusting it from 100% to 90%; the light emission control circuit BC controls the backlight brightness to decrease by 10%, adjusting it from 100% to 90%. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage is higher than the temperature corresponding to the first threshold (78℃), such as 80℃, for 5 minutes, it enters the T4 stage.

[0266] T4 stage: The control circuit MC controls the duty cycle of the first dimming signal PWM to decrease by 10%, adjusting it from 90% to 80%; the light emission control circuit BC controls the backlight brightness to decrease by 10%, adjusting it from 90% to 80%. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage remains between the temperature corresponding to the first threshold (78℃) and the temperature corresponding to the second threshold (75℃) for 5 minutes, such as 76℃, then enters the T5 stage.

[0267] T5 stage: The control circuit MC keeps the states of GPIO1~3 unchanged. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage is higher than the temperature corresponding to the first threshold (78℃) for 5 minutes, such as 80℃, then enter the T6 stage.

[0268] In stage T6: The control circuit MC reduces the duty cycle of the first dimming signal PWM by 10%, and the light-emitting control circuit BC reduces the backlight brightness by 10%. If the temperature corresponding to the temperature sensing voltage remains higher than the temperature corresponding to the first threshold (78℃) for 5 minutes, such as 80℃, the control circuit MC continues to reduce the duty cycle of the first dimming signal PWM by 10% until it equals 10%; the light-emitting control circuit BC reduces the backlight brightness by 10% until it reaches 10%.

[0269] T7 stage: The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage is higher than the temperature corresponding to the first threshold (78℃) for 5 minutes, such as 80℃, then enter the T8 stage.

[0270] T8: The control circuit MC controls the power supply control signal PMIC_EN = L and the backlight switch signal BL_ON / OFF = L. The first switching element Q1 and the second switching element Q2 are turned off. The power management circuit turns off the power output of AVDD, VGH, HAVDD, VGL, and LVGL, and the light-emitting control circuit BC turns off the light-emitting unit. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage remains below the temperature corresponding to the second threshold (75℃) for 5 minutes, such as 74℃, the process enters stage T9.

[0271] T9 stage: The control circuit MC controls the power control signal PMIC_EN = H and the backlight switch signal BL_ON / OFF = H. The first switching element Q1 and the second switching element Q2 are turned on. The power management circuit starts the power output of AVDD, VGH, HAVDD, VGL, and LVGL. The light emission control circuit BC starts the light emission unit, and the backlight brightness is 10%. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage is lower than the temperature corresponding to the first threshold (75℃) for 5 minutes, such as 74℃, then enter the T10 stage.

[0272] During stages T10-T12: The control circuit MC increases the duty cycle of the first dimming signal PWM by 10%, and the light-emitting control circuit BC increases the backlight brightness by 10%. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to this temperature sensing voltage remains below the temperature corresponding to the second threshold (74℃) for 5 minutes, for example, if 74℃ is reached, the control circuit MC increases the duty cycle of the first dimming signal PWM by 10% until it equals 100%; the light-emitting control circuit BC increases the backlight brightness by 10% until it reaches 100%.

[0273] In some implementations of the fourth category:

[0274] like Figure 9 As shown, the power supply terminal GPIO0 of the control circuit MC can be electrically connected to a signal with a variable level, and remains at a high level during the T1 to T9 stages. During the high level period, the self-protection mechanism is activated, and during the low level period, the self-protection mechanism is deactivated; other circuit structures can be the same as in the first embodiment.

[0275] like Figure 10 As shown, in stage T1: the control circuit MC controls PMIC_EN=H, BL_ON / OFF=H, PWM=H, and the power management circuit PM outputs voltages AVDD, VGH, HAVDD, VGL, LVGL, and DVDD_3V3 / 1V8 / 1V2; the light-emitting unit emits light (LED lights up); the first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel.

[0276] T2 stage: If the temperature corresponding to the sensing voltage remains higher than the temperature corresponding to the first threshold (78℃) for 5 minutes, such as 80℃, then enter the T3 stage.

[0277] T3 stage: The control circuit MC controls the duty cycle of the first dimming signal PWM to decrease by 10%, adjusting it from 100% to 90%; the light emission control circuit BC controls the backlight brightness to decrease by 10%, adjusting it from 100% to 90%. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage is higher than the temperature corresponding to the first threshold (78℃), such as 80℃, for 5 minutes, it enters the T4 stage.

[0278] T4 stage: The control circuit MC controls the duty cycle of the first dimming signal PWM to decrease by 10%, adjusting it from 90% to 80%; the light emission control circuit BC controls the backlight brightness to decrease by 10%, adjusting it from 90% to 80%. The first sampling input terminal ADC1 detects the temperature of the display panel. If the temperature corresponding to the temperature sensing voltage remains between the temperature corresponding to the first threshold (78℃) and the temperature corresponding to the second threshold (75℃) for 5 minutes, such as 76℃, then enters the T5 stage.

[0279] T5 stage: The control circuit MC keeps the states of GPIO1~3 unchanged. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage is higher than the temperature corresponding to the first threshold (78℃) for 5 minutes, such as 80℃, then enter the T6 stage.

[0280] In stage T6: The control circuit MC reduces the duty cycle of the first dimming signal PWM by 10%, and the light-emitting control circuit BC reduces the backlight brightness by 10%. If the temperature corresponding to the temperature sensing voltage remains higher than the temperature corresponding to the first threshold (78℃) for 5 minutes, such as 80℃, the control circuit MC continues to reduce the duty cycle of the first dimming signal PWM by 10% until it equals 10%; the light-emitting control circuit BC reduces the backlight brightness by 10% until it reaches 10%.

[0281] T7 stage: The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage is higher than the temperature corresponding to the first threshold (78℃) for 5 minutes, such as 80℃, then enter the T8 stage.

[0282] T8: The control circuit MC controls the power supply control signal PMIC_EN = L and the backlight switch signal BL_ON / OFF = L. The power management circuit shuts down the power output of AVDD, VGH, HAVDD, VGL, and LVGL, and the light-emitting control circuit BC shuts down the light-emitting unit.

[0283] T9 stage: Power supply terminal GPIO0 = L, control circuit MC controls power control signal PMIC_EN = H, backlight switch signal BL_ON / OFF = H. Power management circuit starts power output of AVDD, VGH, HAVDD, VGL, LVGL, light emission control circuit BC turns off light emission unit, backlight brightness is 100%.

[0284] In some implementations of the fifth category:

[0285] like Figure 11 As shown, the third and fourth implementation methods are combined. The specific structure can be referred to in the third and fourth implementation methods, and will not be repeated here.

[0286] like Figure 12 As shown, in stage T1: the control circuit MC controls PMIC_EN=H, BL_ON / OFF=H, and PWM=H; the power management circuit PM outputs voltages AVDD, VGH, HAVDD, VGL, LVGL, and DVDD_3V3 / 1V8 / 1V2; the light-emitting unit emits light (LED lights up); the first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. The first switching element Q1 and the second switching element Q2 are turned on.

[0287] T2 stage: If the temperature corresponding to the sensing voltage remains higher than the temperature corresponding to the first threshold (78℃) for 5 minutes, such as 80℃, then enter the T3 stage.

[0288] T3 stage: The control circuit MC controls the duty cycle of the first dimming signal PWM to decrease by 10%, adjusting it from 100% to 90%; the light emission control circuit BC controls the backlight brightness to decrease by 10%, adjusting it from 100% to 90%. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage is higher than the temperature corresponding to the first threshold (78℃), such as 80℃, for 5 minutes, it enters the T4 stage.

[0289] T4 stage: The control circuit MC controls the duty cycle of the first dimming signal PWM to decrease by 10%, adjusting it from 90% to 80%; the light emission control circuit BC controls the backlight brightness to decrease by 10%, adjusting it from 90% to 80%. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage remains between the temperature corresponding to the first threshold (78℃) and the temperature corresponding to the second threshold (75℃) for 5 minutes, such as 76℃, then enters the T5 stage.

[0290] T5 stage: The control circuit MC keeps the states of GPIO1~3 unchanged. The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage is higher than the temperature corresponding to the first threshold (78℃) for 5 minutes, such as 80℃, then enter the T6 stage.

[0291] In stage T6: The control circuit MC reduces the duty cycle of the first dimming signal PWM by 10%, and the light-emitting control circuit BC reduces the backlight brightness by 10%. If the temperature corresponding to the temperature sensing voltage remains higher than the temperature corresponding to the first threshold (78℃) for 5 minutes, such as 80℃, the control circuit MC continues to reduce the duty cycle of the first dimming signal PWM by 10% until it equals 10%; the light-emitting control circuit BC reduces the backlight brightness by 10% until it reaches 10%.

[0292] T7 stage: The first sampling input terminal ADC1 detects the temperature sensing voltage of the display panel. If the temperature corresponding to the temperature sensing voltage is higher than the temperature corresponding to the first threshold (78℃) for 5 minutes, such as 80℃, then enter the T8 stage.

[0293] T8: The control circuit MC controls the power supply control signal PMIC_EN = L and the backlight switch signal BL_ON / OFF = L. The first switching element Q1 and the second switching element Q2 are turned off. The power management circuit turns off the power output of AVDD, VGH, HAVDD, VGL, and LVGL, and the light-emitting control circuit BC turns off the light-emitting unit.

[0294] T9 stage: Power supply terminal GPIO0 = L, control circuit MC controls power supply control signal PMIC_EN = H, backlight switch signal BL_ON / OFF = H. First switching element Q1 and second switching element Q2 conduct power management circuit to start power output of AVDD, VGH, HAVDD, VGL, LVGL, light emission control circuit BC turns off light emission unit, backlight brightness is 100%.

[0295] In some embodiments of this disclosure, when the ambient temperature exceeds the threshold of the display panel's temperature-sensing voltage, the control circuit can send an interrupt signal IRQ, which is then reported to the main control circuit via the IR terminal on the control circuit. If the ambient temperature does not exceed the threshold, the interrupt signal IRQ is low; if the ambient temperature exceeds the threshold, the interrupt signal IRQ is high. After the main control circuit detects that the interrupt signal IRQ is high, it can read the display panel's temperature-sensing voltage in real time via the IIC terminal and take measures to reduce brightness based on the temperature-sensing voltage. Specific methods can be found in the embodiments described above and will not be detailed here.

[0296] The following example uses a control circuit to illustrate some details of a drive circuit:

[0297] like Figure 13As shown, the control circuit MC is a microcontroller, which may include the following terminals: NRST, OSCIN / PA1, OSCOUT / PA2, VSS, VCAP, VDD, LVDIN / PA3, PC3 / AIN1, PC4 / AIN2, PC5 / LVD_IN, PC6 / AIN0, PAD6 / AIN6, PAD5 / AIN5, PAD4, PAD4 / AIN4, and PAD3 / AIN3.

[0298] The NRST terminal is used to receive a reset signal to perform a reset.

[0299] The OSCIN / PA1, OSCOUT / PA2, AD6 / AIN6, and PAD5 / AIN5 terminals are all electrically connected to the memory FL and are used to transmit SPI_SCK, SPI_CSN, SPI_MOSI, and SPI_MISO data to realize the reading / writing of temperature sensing voltage and other data.

[0300] The VSS terminal is grounded; the VDD terminal is electrically connected to the power supply, which can be 3.3V, to provide power.

[0301] The PAD4 / AIN4 terminal can function as the first indicator terminal LG, and the PAD4 terminal can function as the second indicator terminal LR.

[0302] The PAD3 / AIN3 terminal can serve as the calibration switch ADJUST.

[0303] The VCAP terminal can function as the second sampling input terminal ADC2, and the PC6 / AIN0 terminal can function as the first sampling input terminal ADC1, used to transmit the induced voltage signal Tsensor.

[0304] The LVDIN / PA3 terminal serves as the first dimming control output terminal GPIO3, and the PC3 / AIN1 terminal serves as the backlight switch terminal GPIO2.

[0305] The PC4 / AIN2 pin serves as the power supply GPIO0.

[0306] Capacitors Cf1 and Cf2 connected in parallel can serve as voltage regulators and filters; capacitors Cf3 and Cf4 connected in parallel can also serve as voltage regulators and filters.

[0307] like Figure 14 As shown, Figure 14The diagram shows a first indicating circuit and a second indicating circuit. The control circuit outputs a first indicating signal LED_G and a second indicating signal LED_R to the control terminals of switching elements (transistors) Q3 and Q4, respectively, controlling the on and off states of switching elements Q3 and Q4. When the transistors are on, the first indicator LEDG and the second indicator LEDR light up. By controlling the timing of the on / off state, flashing and constant illumination can be achieved. The first terminals of switching elements Q3 and Q4 are connected to the same power supply voltage LC, and the second terminals are grounded or at another constant potential. Resistors R6 to R9 provide protection.

[0308] like Figure 15 As shown, Figure 15 The memory FL is shown, which includes the chip select terminal CS#, the SO / IO1 terminal, the WP# / IO2 terminal, the VSS terminal, the SI / O0 terminal, the SCLK terminal, the HOLD# / IO3 terminal, and the VCC terminal; wherein:

[0309] The VSS terminal is grounded, and the VCC terminal can be connected to a power supply, such as 3.3V.

[0310] The CS pin is used to receive the chip select signal SPI_CSN.

[0311] The WP# / IO2 side is used for write protection;

[0312] The SO / IO1 pin is used to output the SPI_MISO signal to the control circuit for reading; the SI / O0 pin is used to receive the SPI_MOSI signal for writing data.

[0313] The SCLK pin is used to transmit the clock signal SPI_SCK.

[0314] The HOLD# / IO3 pin is used to transmit the pause signal SPI_HOLD.

[0315] Capacitor CF serves as a voltage regulator. Resistors RF1-RF3 provide protection. The circuit with resistor RF4 is open, but resistor RF4 can be installed for testing purposes.

[0316] In this implementation, the VCC terminal can be electrically connected to the power supply and the HOLD# / IO3, CS, and WP# / IO2 terminals, making all three high-level, so that the memory FL is selected and continuously operating in a state that is not write-protected.

[0317] like Figure 16 As shown, Figure 16 The diagram shows an anti-static circuit consisting of four breakdown diodes, which can be used for electrical connection with external devices to prevent static electricity from external devices from damaging the internal drive circuit. Figure 16The anti-static circuit is also electrically connected to the ADJUST calibration switch terminal and can be used to receive the first indicator signal LED_G and the second indicator signal LED_R. Of course, the anti-static circuit can also be used in other locations.

[0318] like Figure 17 As shown, DVDD is the power supply, and VCC supplies power to the control circuit. However, due to the presence of diode DO, VCC cannot be reversed, thus preventing interference with other electrical components. Resistor RO provides current limiting protection, and capacitors CO1 and CO2 are connected in parallel for filtering and voltage regulation.

[0319] like Figure 18 As shown, the first dimming signal PWM, the backlight switch signal BL_ON / OFF, the power control signal PMIN_EN, and the control signal CTRL_EN can be connected to a constant voltage power signal (e.g., 3.3V, high level) to keep the corresponding ports of these signals high in the control reset or non-operation states. This pulls the signal high, so that even if the control circuit fails or cannot perform the temperature detection and dimming functions mentioned above under control, the display module can still be maintained and will not be completely shut down. Among them, resistors RL2-RL5 can be 10KΩ resistors. When the first dimming signal PWM, the backlight switch signal BL_ON / OFF, the power control signal PMIN_EN, and the control signal CTRL_EN are at a high level (3.3V), they do not interfere with the voltage of the power supply signal. If they are at a low level, the large voltage drop across resistors RL2-RL5 ensures that the high level of the power supply signal will not affect the first dimming signal PWM, the backlight switch signal BL_ON / OFF, the power control signal PMIN_EN, and the control signal CTRL_EN. Similarly, resistor RL1 can pull the temperature sensing voltage signal Tsensor low. Capacitor CL can act as a voltage regulator; through Figure 18 The circuit in the diagram can initialize the relevant signals of the control circuit MC without affecting subsequent changes in the signals.

[0320] like Figure 19 As shown, 3V3 is the power supply voltage, and S is the calibration switch, which can have four terminals: a, b, c, and d. When the calibration switch S is closed, a signal can be output to the ADJUST terminal to enable the calibration function. If the calibration switch S is open, the control circuit MC will not perform the calibration function.

[0321] In some embodiments of this disclosure, the driving circuit may further include a memory FL, which may be a non-volatile storage element such as a Flash memory. The control circuit MC may be electrically connected to the memory FL and may store the average value of the temperature sensing voltage within a specified time interval in the memory FL. The specified time interval may be 3 minutes, 5 minutes, etc. Alternatively, the average value may be converted into a temperature and stored in the memory FL in binary or other formats. Of course, each temperature sensing voltage and / or its corresponding temperature may also be stored in the memory FL for later retrieval.

[0322] The temperature data corresponding to the sensing voltage obtained by the control circuit MC can be stored in the memory FL. Alternatively, it can be stored in the control circuit's own memory unit for the main control circuit to access.

[0323] For example, the format of data read and written at the IIC terminal is as follows:

[0324] S Device ID W A Memory address A DATA A DATA A P

[0325] in:

[0326] S: Start

[0327] Device ID: 0x01 (7 bits)

[0328] Memory address: 0x06 (8 bits)

[0329] W: Write operation is 0; Read operation is 1.

[0330] P: stop

[0331] DATA: Sampled values ​​between 0 and 4096 are converted into 16-bit data and can be stored in two 8-bit data bits.

[0332] For example, a temperature of 21.93℃ has a conversion value of 21.93 × 100 = 2193 (0000 1000 10010001), which can be stored as:

[0333] S 0000001 1 A 00000110 A 10010001 A 00001000 A P

[0334] In some embodiments of this disclosure, the control circuit has an SPI terminal that can be electrically connected to a memory FL, where the temperature can be stored. The stored data can be represented in different data formats. The meaning of the stored data includes, for example, temperature (one temperature represents one temperature sensing duration), whether the duty cycle of the first dimming signal has been adjusted, whether the light-emitting unit is off, whether the display panel is off, the number of times the display module has been turned on, etc. Specific information and events can be marked by adding specific flag bits to the stored data.

[0335] In some implementations, when the display panel temperature remains at 76°C for 30 consecutive minutes, the data stored in the memory FL can be "76 76 76 76 76 76". 76 represents the display panel temperature as 76°C, one "76" represents 5 minutes, and six "76"s represent a continuous 30-minute period at 76°C. In this case, no dimming is needed, and therefore there will be no record of duty cycle adjustment "0x830x7C0xXX". "0x83 0x7C" represents duty cycle adjustment, and "0xXX" is the adjusted duty cycle (hexadecimal).

[0336] When the temperature of the product display panel rises from 76℃ to 83℃ and remains above 78℃ for five minutes, the duty cycle of the first dimming signal decreases from 100% to 75%. The data stored in the memory is: 76 76 76 76 76 76 83 0x83 0x7C 0x63 0x83 0x7C 0x62 0x83 0x7C 0x61……0x83 0x7C 0x4B. This represents a temperature of 76℃ for 30 minutes and 83℃ for 5 minutes, during which the duty cycle decreased from 100% (0x64) to 75% (0x4B).

[0337] When the temperature of the display panel drops from 83℃ to 68℃ and remains below 74℃ for five minutes, the duty cycle of the first dimming signal increases from 75% to 100%. The stored data is: 76 76 76 76 76 83 0x83 0x7C 0x63 0x83 0x7C 0x62 0x83 0x7C 0x61……0x83 0x7C 0x4B 68 0x83 0x7C 0x4C 0x83 0x7C 0x4D……0x83 0x7C 0x64. The temperature range is 76℃ for 30 minutes, 83℃ for 5 minutes, with the duty cycle decreasing from 100% (0x64) to 75% (0x4B), and 68℃ for 5 minutes, with the duty cycle increasing from 75% (0x4B) to 100% (0x64).

[0338] When the display panel temperature rises from 76℃ to 82℃ and remains above 78℃ for five minutes, the duty cycle of the first dimming signal decreases from 100% to 79%; when the temperature rises from 82℃ to 86℃ and remains above 84℃ for five minutes, the duty cycle decreases from 79% to 44% (rounded to the nearest integer). The stored data is: 76 82 0x83 0x7C 0x63 0x83 0x7C 0x62 0x83 0x7C 0x61……0x83 0x7C 0x4F 86 0x83 0x7C 0x4E 0x83 0x7C 0x4D……0x83 0x7C 0x2C. The panel temperature is 76℃ for 5 minutes, 83℃ for 5 minutes, and the duty cycle of the first dimming signal decreases from 100% (0x64) to 79% (0x4F). At 86℃ for 5 minutes, the duty cycle decreases from 79% (0x4F) to 100% (0x2C).

[0339] Data storage instructions are as follows:

[0340]

[0341]

[0342] Furthermore, the lifespan of the panel can be calculated using the stored data, for example:

[0343] When T < T0, Lx = L0;

[0344] When T≥T0, Lx=L0×2^((T0-T) / 10);

[0345] L0 represents the operating time of the display panel, Lx represents the actual lifespan consumed within L0, T0 represents the temperature of the display panel during testing at room temperature (25℃), and T represents the temperature measured during actual use within L0. When the temperature exceeds 25℃, the display panel experiences greater wear and tear, and its lifespan is consumed beyond the actual operating time.

[0346] Read the temperature data from the memory FL. Each temperature value represents 5 minutes of time. Calculate the lifespan consumed at each temperature value. The accumulated value is the lifespan of the display panel.

[0347]

[0348] L1 represents the lifespan of the display panel. When the calculated lifespan exceeds 30,000 hours, the display panel can be considered to have reached its maximum service life.

[0349] During the inspection or testing of the display panel, temperature and voltage data can be obtained from the memory. If the temperature reading exceeds 80℃ or is less than -5℃, it indicates that the display panel is being used beyond specifications. If the temperature reading is between 80℃ and -5℃, it indicates that the customer is using it within specifications. This provides data support for determining lifespan and malfunctions.

[0350] This disclosure also provides a driving method for a display device, which can be any of the display devices described in the above embodiments, and its structure will not be described in detail here. Figure 20 As shown, the driving method includes steps S10-S40, wherein:

[0351] Step S10: Receive the temperature sensing voltage output from the temperature sensing output terminal, and output a light emission driving signal generated based on at least one of the first dimming signal and the second dimming signal;

[0352] Step S20: During time period t, determine the relationship between the temperature sensing voltage and the first threshold and the second threshold.

[0353] Step S30: If the temperature sensing voltage is greater than the first threshold, then during the time period t+1, the duty cycle of the first dimming signal is made less than the duty cycle of the first dimming signal during the time period t; and / or, the voltage of the second dimming signal is less than the voltage of the second dimming signal during the time period t.

[0354] Step S40: If the temperature sensing voltage is less than the second threshold, then during the t+1 time period, the duty cycle of the first dimming signal is made greater than the duty cycle of the first dimming signal during the t time period; and / or, the voltage of the second dimming signal is greater than the voltage of the second dimming signal during the t time period.

[0355] The first threshold is greater than the second threshold.

[0356] By comparing the temperature-sensing voltage output from the temperature-sensing trace with the first and second thresholds, the brightness of the display device can be adjusted, thereby regulating the temperature.

[0357] In some embodiments of this disclosure, determining the relationship between the temperature-sensing voltage and a first threshold and a second threshold includes:

[0358] During time period t, it is determined whether the duration for which the temperature sensing voltage is greater than the first threshold reaches the specified temperature sensing duration; if the duration for which the temperature sensing voltage is greater than the first threshold reaches the first temperature sensing duration, then the first condition is met.

[0359] Determine whether the duration of the temperature sensing voltage being less than the second threshold continues for the temperature sensing duration; if the duration of the temperature sensing voltage being less than the second threshold reaches the second temperature sensing duration, then the second condition is met.

[0360] The duration of the first temperature sensing is no greater than the duration of the second temperature sensing, and the durations of time periods t and t+1 are no less than the duration of the temperature sensing.

[0361] Furthermore, in some embodiments of this disclosure, the duty cycle can be increased or decreased by a fixed adjustment range, thereby increasing or decreasing the brightness by a fixed range. For example, if the temperature sensing voltage meets a first condition, then during time period t+1, the duty cycle of the first dimming signal is made less than the duty cycle of the first dimming signal during time period t; including:

[0362] If the temperature sensing voltage meets the first condition during time period t, and the duty cycle of the first dimming signal is greater than the first adjustment value, then during time period t+1, the duty cycle of the first dimming signal is reduced by the first adjustment value compared to the duty cycle during time period t.

[0363] During time period t, if the temperature sensing voltage meets the first condition and the duty cycle of the first dimming signal is not greater than the first adjustment value, then during time period t+1, the backlight off signal to turn off the light-emitting unit is output.

[0364] If the temperature sensing voltage satisfies the second condition, then during time period t+1, the duty cycle of the first dimming signal is made greater than the duty cycle of the first dimming signal during time period t; including:

[0365] During time period t, if the temperature sensing voltage meets the second condition and the duty cycle of the first dimming signal is less than the difference between 100% and the second adjustment value, then during time period t+1, the duty cycle of the first dimming signal will be increased to the second adjustment value.

[0366] If, during time period t, the temperature sensing voltage meets the second condition and the duty cycle of the first dimming signal is greater than the difference between 100% and the second adjustment value, then during time period t+1, the duty cycle of the first dimming signal is set to 100%.

[0367] The details and principles of the above steps have been explained in detail in the implementation of the driving circuit and display device above, and will not be repeated here.

[0368] like Figure 21 As shown, based on the implementation of the display device described above, taking an example where both the first and second adjustment values ​​are 10% and the temperature sensing time is ten minutes, the above driving method will be explained by way of example:

[0369] Step 110:

[0370] Power-on initialization;

[0371] When the drive circuit is powered on, the control circuit MC can also record the power-on status in the memory FL.

[0372] Step 120:

[0373] The control circuit MC detects the temperature sensing voltage of the temperature sensing trace through the first sampling input terminal ADC1, and accordingly, the corresponding temperature can be obtained;

[0374] The control circuit MC can record the sensing voltage or the converted temperature once every 5 minutes, that is, store a sensing voltage or temperature in the memory every 5 minutes.

[0375] Step 130:

[0376] If the first dimming control output terminal GPIO3 = L, that is, the first dimming control output terminal GPIO3 is at a low level, then return to step 120, disable the self-protection function, that is, lock the first dimming control output terminal GPIO3, only record the temperature sensing voltage or temperature, and do not change the duty cycle of the first dimming signal, that is, do not adjust the brightness of the light-emitting unit.

[0377] If the first dimming control output terminal GPIO3 = H, that is, the first dimming control output terminal GPIO3 is at a high level, proceed to step 140, enable the self-protection function, unlock the first dimming control output terminal GPIO3, and the duty cycle of the first dimming signal is adjustable.

[0378] Step 140:

[0379] Determine whether the temperature sensing voltage is higher than the first threshold (corresponding to a temperature of 78℃) or lower than the second threshold (corresponding to a temperature of 75℃);

[0380] If it falls below the second threshold, proceed to step 150;

[0381] If the temperature is between the second threshold and the first threshold, return to step 120;

[0382] If it is higher than the first threshold; then:

[0383] ① If the sensing voltage does not remain above the first threshold for 10 minutes (sensing duration), return to step 120;

[0384] ② If the temperature sensing voltage remains above the first threshold for 10 minutes and the duty cycle of the first dimming signal PWM is greater than 10%, the duty cycle of the first dimming signal PWM is reduced by 10%, and the process returns to step 120.

[0385] ③ If the voltage level remains above the first threshold for 10 minutes and the duty cycle of the first dimming signal PWM is ≤10%, set GPOI1 / 2 = L, that is, GPOI1 and GPOI2 are at a low level, and turn off the power supply to the display panel and the light-emitting unit; return to step 120;

[0386] Step 150:

[0387] If the temperature sensing voltage does not remain below the second threshold for 10 minutes, return to step 120;

[0388] If the sensing voltage remains below the second threshold for 10 minutes, then:

[0389] ① If GPOI1 = L, GPOI is at a low level, turn on the display panel and the light-emitting unit, and set the power control terminal / backlight switch terminal GPOI1 / 2 = H, that is, the power control terminal GPOI1 and the backlight switch terminal GPOI2 are at a high level; return to step 120;

[0390] ②If the power control terminal GPOI1 = H and the duty cycle of the first dimming signal PWM = 100%, return to step 120;

[0391] If the power control terminal GPOI1 = H and the duty cycle of the first dimming signal PWM is <100%, the duty cycle is increased by 10%, and the process returns to step 120.

[0392] In the above driving method, the duration of the temperature sensing voltage being higher than the first threshold can be recorded by timer 1, and the duration of the temperature sensing voltage being lower than the second threshold can be recorded by timer 2. Timer 1 is reset to zero when the voltage is higher than the first threshold, and timer 2 is reset to zero when the voltage is higher than the second threshold. The specific process of the timer recording duration is described in the above implementation of the display device, and will not be detailed here.

[0393] It should be noted that although the steps of the driving method in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or a step may be broken down into multiple steps.

[0394] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A display module, characterized in that, include: The display panel has temperature sensing traces, which have a temperature sensing input terminal and a temperature sensing output terminal. The light-emitting unit has a light-emitting input terminal; The light-emitting control circuit includes: The first dimming input terminal is used to receive a first dimming signal that controls the brightness of the light-emitting unit; The second dimming input terminal is used to receive a second dimming signal that adjusts the brightness of the light-emitting unit; The dimming output terminal is electrically connected to the light-emitting input terminal and is used to output a light-emitting driving signal generated based on the first dimming signal and the second dimming signal; Control circuit, including: The first sampling input terminal is electrically connected to the temperature sensing output terminal and is used to receive the temperature sensing voltage of the display panel; The first dimming control output terminal is electrically connected to the first dimming input terminal and is used to output the first dimming signal; The second dimming control output terminal is electrically connected to the second dimming input terminal and is used to output the second dimming signal; Wherein, the temperature sensing voltage and the first dimming signal satisfy: During time period t, the temperature sensing voltage is greater than the first threshold, and the first duty cycle of the first dimming signal is less than the second duty cycle; during time period t, the temperature sensing voltage is less than the second threshold, and the first duty cycle is greater than the second duty cycle; the first duty cycle is the duty cycle of the first dimming signal during time period t+1, and the second duty cycle is the duty cycle of the first dimming signal during time period t. And / or, the temperature sensing voltage and the second dimming signal satisfy: During time period t, the temperature sensing voltage is greater than the first threshold, and the first voltage value of the second dimming signal is less than the second voltage value; during time period t, the temperature sensing voltage is less than the second threshold, and the first voltage value is greater than the second voltage value; the first voltage value is the voltage of the second dimming signal during time period t+1, and the second voltage value is the voltage of the second dimming signal during time period t.

2. The display module according to claim 1, characterized in that, The first threshold is greater than the second threshold.

3. The display module according to claim 2, characterized in that, The temperature sensing voltage and the first dimming signal satisfy the following: When the temperature sensing voltage is continuously greater than the first threshold for a specified first temperature sensing duration, the first duty cycle is less than the second duty cycle; when the temperature sensing voltage is continuously not greater than the first threshold for a specified second temperature sensing duration, the first duty cycle is greater than the second duty cycle. And / or, the temperature sensing voltage and the second dimming signal satisfy: The duration during which the temperature sensing voltage remains greater than the first threshold reaches the first temperature sensing duration; The first voltage value is less than the second voltage value; the duration for which the temperature sensing voltage is not greater than the first threshold reaches the second temperature sensing duration, and the first voltage value is greater than the second voltage value. The first temperature sensing duration is not greater than the second temperature sensing duration, and the durations of the t time period and the t+1 time period are not less than the temperature sensing duration.

4. The display module according to claim 3, characterized in that, The display panel includes an array substrate, an opposing substrate, and a liquid crystal layer disposed between the array substrate and the opposing substrate; the light-emitting unit is disposed on the side of the array substrate away from the opposing substrate.

5. The display module according to claim 4, characterized in that, The control circuit also includes a backlight switch terminal, which is electrically connected to the light-emitting unit and is used to transmit a backlight off signal and a backlight on signal to the light-emitting unit. The temperature sensing voltage and the first dimming signal satisfy the following: During time period t, the temperature sensing voltage is greater than the first threshold, and the second duty cycle is greater than the first adjustment value. The difference between the first duty cycle and the second duty cycle is the first adjustment value. If the temperature sensing voltage is greater than the first threshold during time period t, and the second duty cycle is not greater than the first adjustment value, the control circuit outputs the backlight off signal during time period t+1.

6. The display module according to claim 4, characterized in that, The temperature sensing voltage and the second dimming signal satisfy the following: During time period t, the temperature sensing voltage is less than the second threshold, and the second duty cycle is less than the difference between 100% and the second adjustment value. The difference between the first duty cycle and the second duty cycle is the second adjustment value. During time period t, the temperature sensing voltage is less than the second threshold, and the second duty cycle is greater than the difference between 100% and the second adjustment value, wherein the first duty cycle is 100%.

7. The display module according to claim 5, characterized in that, The display module also includes a power management circuit, which is electrically connected to an external power supply and is used to control the display panel to start and stop. When the temperature sensing voltage is greater than the first threshold during time period t and the second duty cycle is not greater than the first adjustment value, the control circuit outputs the backlight off signal to the power management circuit during time period t+1, and the power management circuit turns off the display panel.

8. The display module according to claim 4, characterized in that, The temperature sensing voltage satisfies a preset temperature-voltage conversion relationship, and in the temperature-voltage conversion relationship, one voltage corresponds to one temperature; If the temperature sensing voltage is greater than the first threshold during time period t, the difference between the first duty cycle and the second duty cycle is the first adjustment value; If the temperature sensing voltage is less than the second threshold during time period t, then the difference between the first duty cycle and the second duty cycle is the second adjustment value during time period t+1. The first adjustment value satisfies the following relationship: Y1 = [(TH-X) / CA] × 100%; The second adjustment value satisfies the following relationship: Y2 = [(TL-X) / C+B]×100%; Y1 is the first adjustment value, TH is the first threshold, X is the temperature sensing voltage, TL is the second threshold, C is the voltage corresponding to the temperature rise of the display panel surface caused by light emission in the temperature-voltage conversion relationship, A is the minimum magnitude of decreasing the duty cycle, B is the minimum magnitude of increasing the duty cycle, and C, A and B are all preset constants.

9. The display module according to claim 4, characterized in that, The temperature sensing voltage and the first dimming signal satisfy the following: The duration during time period t when the sensing voltage is greater than the first threshold and less than the third threshold reaches the first sensing duration, wherein the third threshold is greater than the first threshold; The difference between the first duty cycle and the second duty cycle is the first duty cycle difference; The duration during time period t when the temperature sensing voltage is not less than the third threshold reaches the third temperature sensing duration, and the first duty cycle is less than the second duty cycle; Furthermore, the difference between the first duty cycle and the second duty cycle is the second duty cycle difference; The third temperature sensing duration is not greater than the first temperature sensing duration, and the absolute value of the second duty cycle difference is greater than the absolute value of the first duty cycle difference.

10. The display module according to claim 4, characterized in that, During time period t, the duration for which the temperature-sensing voltage is greater than a first threshold and less than a third threshold reaches the first temperature-sensing duration, wherein the third threshold is greater than the first threshold; the difference between the first voltage value and the second voltage value is the first voltage difference; The duration during time period t when the temperature sensing voltage is not less than the third threshold reaches the third temperature sensing duration, the first voltage value is less than the second voltage value, and the difference between the first voltage value and the second voltage value is the second voltage difference; The third temperature sensing duration is not greater than the first temperature sensing duration, and the absolute value of the second pressure difference is greater than the absolute value of the first pressure difference.

11. The display module according to claim 9, characterized in that, The temperature sensing voltage satisfies a preset temperature-voltage conversion relationship, and in the temperature-voltage conversion relationship, one voltage corresponds to one temperature; The duration during time period t when the temperature sensing voltage is greater than the first threshold and less than the third threshold reaches the first temperature sensing duration, and the difference between the first duty cycle and the second duty cycle is the third adjustment value; The duration for which the temperature sensing voltage remains not less than the third threshold reaches the third temperature sensing duration, and the difference between the first duty cycle and the second duty cycle is the fourth adjustment value; The third adjustment value satisfies the following relationship: Y3 = [(TH-X) / CE] × 100%; The fourth adjustment value satisfies the following relationship: Y4=[(TM-X)×K / CF]×100%; Y3 is the third adjustment value, Y4 is the fourth adjustment value, TH is the first threshold, TM is the third threshold, X is the temperature sensing voltage, C is the voltage corresponding to the temperature rise of the display panel surface caused by light emission based on the temperature-voltage conversion relationship, K, E and F are all constants, and F is greater than E, 1 < K < 4.

12. The display module according to claim 9, characterized in that, The temperature sensing voltage satisfies a preset temperature-voltage conversion relationship, and in the temperature-voltage conversion relationship, one voltage corresponds to one temperature; Based on the aforementioned temperature-voltage conversion relationship: The temperature corresponding to the first threshold is less than 80°C and not less than 78°C; The temperature corresponding to the second threshold is no greater than 75℃; The temperature corresponding to the third threshold is not less than 80℃ and not greater than 85℃.

13. The display module according to any one of claims 1-12, characterized in that, The display module also includes a first voltage divider resistor; The temperature sensing voltage satisfies a preset temperature-voltage conversion relationship, and in the temperature-voltage conversion relationship, one voltage corresponds to one temperature; the control circuit is further used for: If the temperature corresponding to the temperature sensing voltage is different from the specified ambient temperature under a specified ambient temperature, the temperature corresponding to the temperature sensing voltage is corrected to the specified ambient temperature, and the temperature-voltage conversion relationship is updated accordingly.

14. The display module according to claim 13, characterized in that, The control circuit further includes a second sampling input terminal and a power control terminal, wherein the power control terminal is electrically connected to the second sampling input terminal; one end of the first voltage divider resistor is electrically connected to the first sampling input terminal, and the other end is electrically connected to a constant potential.

15. The display module according to any one of claims 3-12, characterized in that, The temperature sensing voltage is the average value of the voltages obtained m times within a specified sampling time, where m is greater than 1; the first temperature sensing time and the second temperature sensing time are integer multiples of the sampling time.

16. The display module according to claim 14, characterized in that, The display module further includes a second voltage divider resistor and a third voltage divider resistor, which are connected in series between a constant potential terminal and the temperature sensing input terminal; the second sampling input terminal is electrically connected between the second voltage divider resistor and the third voltage divider resistor; The temperature sensing voltage obtained from the first sampling input terminal is used as the first voltage, and the temperature sensing voltage obtained from the second sampling input terminal is used as the second voltage. The control circuit is also used for: When the first voltage is not greater than k1 times the second voltage and not less than k2 times the second voltage, the temperature corresponding to the first voltage based on the temperature-voltage conversion relationship is corrected to the specified ambient temperature, and the temperature-voltage conversion relationship is updated accordingly. 1 < k1 < 2, 0 < k2 < 1.

17. The display module according to claim 16, characterized in that, The display module further includes a calibration switch, and the control circuit has a calibration switch terminal; the calibration switch is electrically connected to the calibration switch terminal and is used to output a start signal and a stop signal to the control circuit; The control circuit is also used for: Upon receiving the start signal, the light-emitting unit is turned off, and when the first voltage is not greater than k1 times the second voltage and not less than k2 times the second voltage, the temperature corresponding to the first voltage based on the temperature-voltage conversion relationship is corrected to the specified ambient temperature, and the temperature-voltage conversion relationship is updated accordingly. 1 < k1 < 2, 0 < k2 < 1.

18. The display module according to claim 17, characterized in that, k1 = 1.6, k2 = 0.

4.

19. The display module according to claim 17, characterized in that, The display module further includes a first indicator circuit, the first indicator circuit including a first indicator light of a first color; the control circuit includes a first indicator terminal, and the first indicator circuit is electrically connected to the first indicator terminal. The control circuit is also used for: During the process of acquiring the first voltage, comparing the first voltage with the second voltage, and updating the temperature-voltage conversion relationship, the first indicator light is controlled to flash; After updating the temperature-voltage conversion relationship, the first indicator light is kept on.

20. The display module according to claim 19, characterized in that, The display module further includes a second indicator circuit, which includes a second indicator light of a second color; the control circuit includes a second indicator terminal, which is electrically connected to the second indicator circuit; the second color is different from the first color. The control circuit is also used for: When the first voltage is greater than k1 times the second voltage or less than k2 times the second voltage, the second indicator light is kept on.

21. The display module according to claim 7, characterized in that, The control circuit further includes a second sampling input terminal and a power control terminal. The second sampling input terminal is electrically connected to the input terminal of the power management circuit and the temperature sensing trace. The power management circuit is used to supply power to the control circuit and the temperature sensing trace. The power control terminal is electrically connected to the power management circuit. The power control terminal is used to output a power control signal that causes the power management circuit to control the display panel to start and stop.

22. The display module according to claim 7, characterized in that, The control circuit has a power control terminal, which is electrically connected to the power management circuit; the power control terminal is used to output a power control signal that causes the power management circuit to control the display panel to start and stop. The display module also includes a first switching element and a power supply circuit; The control electrode of the first switching element is electrically connected to the power control terminal, the first electrode is electrically connected to the external power supply, and the second electrode is electrically connected to the power management circuit; the first switching element can be turned on and off under the control of the power control signal output by the power control terminal. The power supply circuit is electrically connected to the external power source and the control circuit, and is used to supply power to the control circuit.

23. The display module according to claim 22, characterized in that, The display module further includes a second switching element, the control electrode of the second switching element is electrically connected to the power control terminal, the first electrode is electrically connected to a constant potential, and the second electrode is electrically connected to the control electrode of the second switching element; the first switching element is a P-type MOS transistor, and the second switching element is a transistor.

24. A display device, characterized in that, Includes the display module as described in any one of claims 1-23.

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