Driving method of display panel, display device

Abstract

Embodiments of the present application provide a display panel driving method and display device, and relate to the technical field of display, which are used for avoiding the influence on display signal when the display panel is heated. The driving process of the display panel comprises a display period and a blank period. The display panel driving method comprises: judging whether the panel temperature of the display panel is less than a temperature threshold value, if yes, applying a heating signal to the heating wire in the display panel in the blank period; continuing to judge whether the panel temperature after heating is less than the temperature threshold value, if yes, continuing to heat the heating wire, if not, stopping applying the heating signal to the heating wire in the blank period.

Description

[0001] The present application relates to the technical field of display, in particular to a display panel driving method and display device.

[0002] The liquid crystal display panel uses liquid crystal molecules to realize picture display, but the characteristics of the liquid crystal molecules are easily affected by temperature, at low temperature, the viscosity of the liquid crystal molecules increases, the response time increases, and problems such as picture quality degradation of the liquid crystal display panel and tailing of dynamic images are easily caused. When the temperature is too low, the liquid crystal molecules even lose the characteristics of the liquid crystal state, resulting in failure to normally display pictures.

[0003] Therefore, the embodiments of the present application provide a display panel driving method and display device for avoiding the influence on the display signal when the display panel is heated.

[0004] In one aspect, the embodiments of the present application provide a display panel driving method, and the driving process of the display panel includes a display period and a blank period.

[0005] The display panel driving method includes:

[0006] determining whether the panel temperature of the display panel is less than a temperature threshold, and if so, applying a heating signal to the heating wire in the display panel in the blank period;

[0007] continuously determining whether the panel temperature after heating is less than the temperature threshold, and if so, continuously heating the heating wire, and if not, stopping applying the heating signal to the heating wire in the blank period.

[0008] In another aspect, the embodiments of the present application provide a display device, which includes:

[0009] a display panel including a heating wire;

[0010] a driving module configured to determine whether the panel temperature of the display panel is less than a temperature threshold, and if so, apply a heating signal to the heating wire in the display panel in the blank period, and continuously determine whether the panel temperature of the display panel after heating is less than the temperature threshold, and if so, continuously heat the heating wire, and if not, stop applying the heating signal to the heating wire in the blank period.

[0011] One of the above technical solutions has the following beneficial effects:

[0012] ​​​In the embodiment of the present application, when the panel temperature of the display panel is lower than the temperature threshold, by selecting to perform the operations of turning on the heating and turning off the heating in the blank period without display, the time of voltage jump on the heating wire can be staggered with the display period, so that the voltage jump on the heating wire can be prevented from interfering with the control signal in the normal display period, and the working stability of the gate driving module in the display period is improved. The embodiment of the present application meets the normal use requirement of the display panel in the low temperature state, and overcomes some adverse effects of the display panel heating on the display, so that the performance of the display panel can be effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0014] Figure 1 A structural schematic diagram of the display panel provided by the embodiment of the present application;

[0015] Figure 2 A flowchart of the driving method provided by the embodiment of the present application;

[0016] Figure 3 A schematic diagram of the display period and the blank period provided by the embodiment of the present application;

[0017] Figure 4 Another flowchart of the driving method provided by the embodiment of the present application;

[0018] Figure 5 A timing diagram corresponding to the driving process of the display panel provided by the embodiment of the present application;

[0019] Figure 6 Another timing diagram corresponding to the driving process of the display panel provided by the embodiment of the present application;

[0020] Figure 7 Still another timing diagram corresponding to the driving process of the display panel provided by the embodiment of the present application;

[0021] Figure 8 Still another timing diagram corresponding to the driving process of the display panel provided by the embodiment of the present application;

[0022] Figure 9 Still another flowchart of the driving method provided by the embodiment of the present application;

[0023] Figure 10A schematic diagram showing the relationship between the resistance of the temperature-sensing resistor and the panel temperature provided by an embodiment of the present invention;

[0024] Figure 11 A schematic structural diagram of a display device provided by an embodiment of the present invention in an unfolded state;

[0025] Figure 12 Another structural schematic diagram of the display device provided by an embodiment of the present invention in an unfolded state. [Specific implementation method]

[0026] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] It should be understood that the embodiments described are only a portion of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0028] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "an", "the" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0029] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0030] In order to meet the normal use requirements of the display panel in a low temperature state, in an embodiment of the present invention, a heating line may be provided in the display panel. When the display panel is in a low temperature state, the heating line is used to heat the display panel.

[0031] However, further research by the inventors revealed that in order for the heating traces to receive the heating signal, they must at least extend into the non-display area to connect to the pins providing the heating signal. However, due to the large number of traces provided in the non-display area, it is inevitable that some of the heating traces will be close together or overlap.

[0032] In one setup, such as Figure 1 As shown, Figure 1A structure schematic diagram of the display panel 1 provided by the embodiment of the present application is shown in the figure. The heating wires 2 in the display panel 1 can include first heating wires 3, second heating wires 4 and third heating wires 5. The first heating wires 3 are arranged in the same direction and located at least in the display area AA. The second heating wires 4 are located in the non-display area AA and surround the display area AA. The second heating wires 4 are electrically connected with the first ends of the first heating wires 3 and a first pin 6 for providing a first heating signal respectively. The third heating wires 5 are located in the lower frame of the non-display area AA. The third heating wires 5 are electrically connected with the second ends of the first heating wires 3 and a second pin 7 for providing a second heating signal respectively.

[0033] When the display panel 1 is heated, the second heating wires 4 receive the first heating signal, the third heating wires 5 receive the second heating signal, and the first heating wires 3 are heated under the action of the current.

[0034] It can be understood that, in order to realize normal display of the display panel 1, the display panel 1 further includes a data driving module 8 and a gate driving module 9 located in the non-display area AA. The data driving module 8 is electrically connected with the gate driving module 9 through a control signal line 10. The data driving module 8 provides control signals such as shift control signals and clock control signals to the gate driving module 9 through the control signal line 10, so as to drive the gate driving module 9 to scan the display panel 1.

[0035] When part of the heating wires 2 extends in the non-display area AA, the part of the heating wires 2 is close to or overlaps the control signal line 10. For example, the heating wires 2 are arranged in different layers from the control signal line 10, but the second heating wires 4 and the third heating wires 5 are close to the control signal line 10, and especially the third heating wires 5 overlap the control signal line 10. In this way, when the display panel 1 is turned on or turned off, the transient voltage jump generated on the heating wires 2 will obviously interfere with the control signals transmitted on the control signal line 10, affect the working stability of the gate driving module 9, and further affect the display.

[0036] To this end, the embodiment of the present application provides a driving method of the display panel 1, which can be used to drive the display panel 1 as shown in the figure. Figure 1

[0037] The driving process of the display panel 1 includes a display period and a blank period. In the display period, the gate driving module 9 responds to the control signals to perform line scanning on the display panel 1, and drive the current row of sub-pixels to emit light for picture display. In the blank period, the sub-pixels do not emit light, and the display panel 1 does not display.

[0038] As shown in the figure, Figure 2 Figure 2 ​​A flow chart of the driving method provided by the embodiment of the present application can include:

[0039] Step S1: judging whether the panel temperature of the display panel 1 is less than the temperature threshold value, if yes, applying the heating signal to the heating wire 2 in the display panel 1 in the blank period.

[0040] Step S2: continuously judging whether the panel temperature after heating is less than the temperature threshold value, if yes, continuously heating the heating wire 2, if no, stopping applying the heating signal to the heating wire 2 in the blank period.

[0041] It should be noted that the heating signal can include the first heating signal and the second heating signal, when the first heating signal and the second heating signal are applied, the heating wire 2 is heated under the action of the current, and the heat of the heating wire 2 acts on the liquid crystal molecules, avoiding the characteristic failure of the liquid crystal molecules at low temperature.

[0042] It can be understood that the moment of applying the heating signal to the heating wire 2 in the display panel 1 is that the display panel 1 has performed the operation of starting heating, at this moment, the transient voltage jump will occur on the heating wire 2; the moment of stopping applying the heating signal to the heating wire 2 in the display panel 1 is that the display panel 1 has performed the operation of stopping heating, at this moment, the transient voltage jump will also occur on the heating wire 2.

[0043] In the embodiment of the present application, when the panel temperature of the display panel 1 is lower than the temperature threshold value, by selecting to perform the operations of starting heating and stopping heating in the blank period without display, the moment of voltage jump on the heating wire 2 can be staggered with the display period, so that the voltage jump on the heating wire 2 can be prevented from interfering with the control signal during normal display, and the working stability of the gate drive module 9 in the display period can be improved. The embodiment of the present application meets the normal use requirement of the display panel 1 at low temperature, and also overcomes some adverse effects of heating of the display panel 1 on display, so that the performance of the display panel 1 can be effectively improved.

[0044] It should be noted that, Figure 1 The structure of the display panel shown is only for illustrative description, and the driving method provided by the embodiment of the present application is not limited to be applied in Figure 1 the display panel structure shown, but also can be applied in other display panels with heating function. In other display panels with heating function, the arrangement mode of the heating wire 2 is not limited to Figure 1 the arrangement mode shown, as long as the heating wire 2 is close to or overlaps with the control signal line 10, the driving method provided by the embodiment of the present application can be used to improve the display effect.

[0045] In a feasible implementation manner, asFigure 3 As shown in the figure, Figure 3 A schematic diagram of the display period and the blank period provided by the embodiment of the present application, the driving process of the display panel 1 includes multiple frames F, a frame F includes multiple row driving periods H, the row driving period H includes a display period D and at least two row blank periods B1, the display period D is located between the two row blank periods B1, and the adjacent two frames include a frame blank period B2.

[0046] The blank period includes the row blank period B1 and / or the frame blank period B2.

[0047] In the display period D in the row driving period H, the gate driving module 11 performs row scanning on the display panel 1 in response to the control signal, and meanwhile the row of sub-pixels completes the writing of the data voltage, so that the row of sub-pixels displays the required display content. In the row blank period B1 in the row driving period H and the frame blank period B2 between the two frames, the sub-pixels do not emit light, and the display panel 1 does not display.

[0048] The embodiment of the present application can avoid the influence of the voltage jump on the heating wire 2 on the control signal transmitted in the display period D by performing the operation of turning on the heating or turning off the heating on the display panel 1 in the row blank period B1 and / or the frame blank period B2, thereby ensuring the stability of the control signal in the display period D, and enabling the gate driving module 11 to perform row scanning more stably.

[0049] In a feasible implementation manner, as Figure 4 As shown in the figure, Figure 4 Another flowchart of the driving method provided by the embodiment of the present application, in step S1, when the panel temperature is less than the temperature threshold, the process of applying the heating signal to the heating wire 2 in the blank period includes: when the panel temperature is less than the temperature threshold, determining whether the current time is in the blank period, if yes, applying the heating signal to the heating wire 2 in the blank period, and if no, entering the blank period and then applying the heating signal to the heating wire 2.

[0050] In step S2, when the panel temperature is greater than or equal to the temperature threshold, the process of stopping applying the heating signal to the heating wire 2 in the blank period includes: when the panel temperature is greater than or equal to the temperature threshold, determining whether the current time is in the blank period, if yes, stopping applying the heating signal to the heating wire 2 in the blank period, and if no, entering the blank period and then stopping applying the heating signal to the heating wire 2.

[0051] When the panel temperature is less than the temperature threshold, if it is judged that the current time is in the blank period, heating is directly started in the blank period in which the display panel 1 is currently located, so as to quickly heat the display panel 1 and avoid affecting the characteristics of the liquid crystal molecules due to long time in low temperature state. If it is judged that the current time is in the display period, heating is started after entering the blank period, so as to prevent voltage jump on the heating wire 2 in the display stage and avoid affecting the stability of the control signal in the display stage.

[0052] After the display panel 1 is heated for a period of time, if it is judged that the current time is in the blank period, heating is directly turned off in the blank period in which the display panel 1 is currently located, so as to avoid heating the display panel 1 to a temperature that is too high on the premise that the temperature of the display panel 1 has returned to normal, and also save power consumption. If it is judged that the current time is in the display period, heating is turned off after entering the blank period, so as to prevent voltage jump on the heating wire 2 in the display stage and avoid affecting the stability of the control signal in the display stage.

[0053] Further, when the panel temperature is less than the temperature threshold, if the current time is in the display period, a heating signal is applied to the heating wire 2 after entering the blank period adjacent to the display period in which the display panel 1 is currently located, so as to quickly heat the display panel 1 and reduce the time of the liquid crystal molecules in a low temperature environment.

[0054] When the panel temperature is greater than or equal to the temperature threshold, if the current time is in the display period, the heating signal applied to the heating wire 2 is turned off after entering the blank period adjacent to the display period in which the display panel 1 is currently located, so as to quickly turn off the heating of the display panel 1 and save power consumption to a greater extent.

[0055] In a feasible implementation manner, in combination with Figures 5-7 , the process of judging whether the current time is in the blank period includes: identifying whether the current time is in the blank period according to the synchronization reference signal, the pixel clock signal DCLK and the flag signal SYNC'. The synchronization reference signal can include a row synchronization signal HS, a field synchronization signal VS and / or an effective display data selection signal DE and the like. The above-mentioned synchronization reference signal, the pixel clock signal DCLK and the flag signal SYNC' can be provided by the data driving module 8.

[0056] The aforementioned row blank period B1 can be defined by the synchronization signal HS, and the frame blank period B2 can be defined by the field synchronization signal VS. As shown in Figure 5 , the current time is in the blank period, the heating signal applied to the heating wire 2 is turned off after entering the blank period adjacent to the display period in which the display panel 1 is currently located, so as to quickly turn off the heating of the display panel 1 and save power consumption to a greater extent. Figure 5A timing diagram corresponding to the driving process of the display panel 1 provided by the embodiment of the present application is shown in FIG. 1. In the row driving period H, the time period between the starting time of the enable level of the row synchronization signal HS corresponding to the current row and the display period D of the current row is a row blank period B1, and the time period between the display period D of the current row and the starting time of the enable level of the row synchronization signal HS corresponding to the next row is another row blank period B1. The time period between the ending time of the last row driving period H in the current frame F and the starting time of the enable level of the field synchronization signal VS corresponding to the next frame F is a frame blank period B2.

[0057] For example, in the case of the row blank period B1, when it is determined that the panel temperature of the display panel 1 is less than the temperature threshold, or when it is determined that the panel temperature of the display panel 1 is greater than or equal to the temperature threshold after heating for a period of time, the heating signal V1 is applied as shown in FIG. 2. Figure 6 Figure 6 Another timing diagram corresponding to the driving process of the display panel 1 provided by the embodiment of the present application is shown in FIG. 3. The current time can be identified as being in the display period D or in the row blank period B1 according to the row synchronization signal HS, the pixel clock signal DCLK and the flag signal SYNC'. For example, as shown in FIG. 3, the flag signal SYNC' is high in the row blank period B1 and low in the display period D. Figure 7 Figure 7 Still another timing diagram corresponding to the driving process of the display panel 1 provided by the embodiment of the present application is shown in FIG. 4. The current time can be identified as being in the display period D or in the row blank period B1 according to the row synchronization signal HS, the valid display data selection signal DE, the pixel clock signal DCLK and the flag signal SYNC'. For example, as shown in FIG. 4, the flag signal SYNC' is high in the row blank period B1 and low in the display period D. Figure 6 Figure 7 Data_R, Data_G and Data_B shown in FIGS. 2, 3 and 4 respectively represent the data voltage written to the red sub-pixel, the green sub-pixel and the blue sub-pixel, T represents the panel temperature, and V1 represents the heating signal.

[0058] It should be noted that the flag signal SYNC' shown in FIGS. 2, 3 and 4 is only illustrative. In other alternative embodiments of the present application, the flag signal SYNC' can also be high in the blank period and low in the display period. Figure 6 Figure 7 The above-described manner can accurately identify whether the time t01 at which the panel temperature T of the display panel 1 is less than the temperature threshold, or the time t02 at which the panel temperature of the display panel 1 is greater than or equal to the temperature threshold after heating for a period of time, is in the blank period, and thus can accurately select the time t11 at which the heating signal V1 is applied and the time t12 at which the heating signal V1 is stopped, and accurately control the time point at which the heating is turned on or off.

[0059] In a feasible embodiment, as shown in FIG. 5, the flag signal SYNC' is high in the row blank period B1 and low in the display period D.

[0060] In a feasible embodiment, as shown in FIG. 5, the flag signal SYNC' is high in the row blank period B1 and low in the display period D.​​​​Figure 8 As shown, Figure 8 Another timing diagram corresponding to the driving process of the display panel 1 provided in an embodiment of the present invention, wherein the process of applying the heating signal V1 to the heating trace 2 during the blank period includes: applying a heating voltage to the heating trace 2 in succession during at least two blank periods, and the applied heating voltage increases gradually. Figure 8 The heating voltages applied each time are represented by v1, v2, ..., vn, respectively, with the values ​​of v1, v2, ..., vn increasing in sequence. The heating voltages may be the voltages of the first heating signal. In one configuration, the voltage of the second heating signal is fixed, and the voltage of the first heating signal is applied sequentially.

[0061] In an embodiment of the present invention, a step-by-step voltage increase method can be used to heat the display panel 1. Especially when the required heating voltage is high, this method is gentler than instantaneously increasing the voltage of the heating trace 2 to a higher voltage, thereby reducing the risk of the trace being damaged by the instantaneous high voltage. Furthermore, by selecting each step-by-step voltage increase during the blank period, voltage jumps on the heating trace 2 during the display period can be avoided, thereby preventing interference with the control signal.

[0062] It should be noted that, in the embodiment of the present invention, the voltage of the heating trace 2 can be successively increased in a plurality of adjacent blank periods, or in a plurality of intervening blank periods. Moreover, the voltage difference between two adjacent heating voltage applications can be the same, thereby avoiding a large difference in the span of the heating voltages applied successively and achieving uniform pressure application.

[0063] In the embodiment of the present invention, the maximum voltage value of the heating signal is V max To achieve rapid temperature rise, V max Satisfy: 30V≤V max ≤35 V. At this time, the heating voltage is relatively large, which can achieve rapid temperature rise, further reducing the risk of liquid crystal molecule failure.

[0064] It should be noted that if the Figure 8 The maximum voltage value of the heating signal V max It can be understood as the value set for vn.

[0065] In one possible embodiment, combining Figure 12 ,like Figure 9 As shown, Figure 9 In another flow chart of the driving method provided by an embodiment of the present invention, the process of determining whether the panel temperature is less than the temperature threshold includes:

[0066] Step K1 : the Wheatstone bridge circuit 14 outputs a first voltage according to the resistance of the temperature-sensitive resistor Rx.

[0067] Step K2: obtaining the panel temperature corresponding to the first voltage according to the voltage-panel temperature mapping relationship, and determining whether the panel temperature is less than a temperature threshold.

[0068] like Figure 10 As shown, Figure 10 This is a schematic diagram of the relationship between the resistance of the temperature-sensing resistor Rx and the panel temperature provided in an embodiment of the present invention. When the panel temperature of the display panel 1 changes, the resistance of the temperature-sensing resistor Rx in the Wheatstone bridge circuit 14 also changes accordingly, causing the balance of the Wheatstone bridge circuit 14 to be destroyed. At this time, the Wheatstone bridge circuit 14 will output a first voltage, which can reflect the resistance of the temperature-sensing resistor Rx and, in turn, the panel temperature. After obtaining the first voltage, the panel temperature corresponding to the first voltage can be obtained by searching in a pre-stored voltage-panel temperature mapping relationship. The obtained panel temperature is the current temperature of the display panel 1.

[0069] In a feasible implementation, when the panel temperature is less than a temperature threshold, the driving method further includes: generating a heating signal according to the panel temperature, wherein a duty cycle of the heating signal is negatively correlated with the panel temperature.

[0070] In the above-mentioned driving method, when the display panel 1 is in a low-temperature state, the generated heating signal can be adjusted accordingly according to the panel temperature. The lower the panel temperature, the greater the duty cycle of the generated heating signal. Then, after the heating signal is applied to the heating trace 2, the heating electrode heats up faster, thereby reducing the risk of characteristic failure of the liquid crystal molecules at low temperatures to a greater extent, and achieving a better heating effect on the display panel 1.

[0071] Based on the same inventive concept, an embodiment of the present invention further provides a display device, Figure 1 and Figure 2 ,like Figure 11 As shown, Figure 11 This is a schematic diagram of the structure of a display device provided by an embodiment of the present invention in an unfolded state. The display device includes a display panel 1 and a driving module 11. The display panel 1 includes a heating trace 2. The driving module 11 can be located on an FPC or a PCB. The driving module 11 is configured to determine whether the panel temperature of the display panel 1 is less than a temperature threshold. If so, a heating signal is applied to the heating trace 2 in the display panel 1 during a blank period. The driving module 11 is configured to further determine whether the heated panel temperature of the display panel 1 is less than the temperature threshold. If so, heating of the heating trace 2 is continued. If not, application of the heating signal to the heating trace 2 is stopped during the blank period.

[0072] In combination with the above description of the driving method of the display panel 1, when the panel temperature of the display panel 1 is lower than the temperature threshold, the display device provided by the embodiment of the present application can avoid the voltage jump on the heating wire 2 from interfering with the control signal during normal display by selecting to perform the operation of turning on the heating and turning off the heating during the blank period, which can effectively improve the display performance while meeting the normal use requirements of the display panel 1 under low temperature.

[0073] In an available embodiment, in combination with Figure 4 Referring again to Figure 11 , the driving module 11 includes a processing unit 12 and a heating control unit 13 electrically connected.

[0074] The processing unit 12 is configured to: detect the panel temperature and determine whether the panel temperature is less than the temperature threshold; when it is determined that the panel temperature is less than the temperature threshold, generate a heating signal and determine whether the current time is in a blank period, if yes, issue an opening trigger instruction containing the heating signal information, and if no, issue the opening trigger signal after entering the blank period, and after heating the display panel 1, determine whether the current time is in a blank period when it is determined that the panel temperature is greater than or equal to the temperature threshold, if yes, issue a closing trigger signal, and if no, issue the closing trigger signal after entering the blank period.

[0075] The method of determining whether the current time is in a blank period has been described in the above embodiment, which will not be repeated here.

[0076] The heating control unit 13 is configured to apply a heating signal to the heating wire 2 in response to the opening trigger signal, and stop applying the heating signal to the heating wire 2 in response to the closing trigger signal.

[0077] When the panel temperature is less than the temperature threshold, if the processing unit 12 determines that the current time is in a blank period, it directly issues the opening trigger signal in the blank period it is currently in to control the heating control unit 13 to heat the display panel 1 as soon as possible to avoid affecting the characteristics of the liquid crystal molecules due to being in a low temperature state for a long time, and if it determines that the current time is in a display period, the processing unit 12 issues the opening trigger signal after entering the blank period, thereby mutually staggering the voltage jump on the heating wire 2 and the display period.

[0078] After the display panel 1 is heated for a period of time, when the panel temperature is greater than or equal to the temperature threshold, the processing unit 12 directly issues a closing trigger signal in the blank period currently in if it is judged that the current time is in the blank period, so as to control the heating control unit 13 to close the heating as soon as possible, thereby avoiding the display panel 1 from being heated to a temperature that is too high on the premise that the temperature of the display panel 1 has returned to normal, and saving power consumption at the same time, and the processing unit 12 issues the closing trigger signal again after entering the blank period if it is judged that the current time is in the display period, so as to stagger the voltage jump on the heating wire 2 and the display period.

[0079] Further, as shown in Figure 12 , Figure 12 Another structure schematic diagram of the display device provided by the embodiment of the present application in the unfolded state, the processing unit 12 can include a Wheatstone bridge circuit 14, a temperature acquisition sub-unit 15 and a trigger sub-unit 16.

[0080] The Wheatstone bridge circuit 14 includes a temperature sensing resistor Rx located at the display panel 1, and the Wheatstone bridge circuit 14 is used to output a first voltage according to the resistance value of the temperature sensing resistor Rx. In addition, the Wheatstone bridge circuit 14 can also include a first fixed resistor R1, a second fixed resistor R2 and a third fixed resistor R3, and the working principle of the Wheatstone bridge circuit 14 is the same as that of the prior art, which will not be described here.

[0081] The temperature acquisition sub-unit 15 is electrically connected with the Wheatstone bridge circuit 14, and is used to acquire the panel temperature corresponding to the first voltage according to the voltage-panel temperature mapping relationship, and judge whether the panel temperature is less than the temperature threshold.

[0082] The trigger sub-unit 16 is electrically connected with the temperature acquisition sub-unit 15 and the heating control unit 13 respectively, generates a heating signal when the panel temperature is less than the temperature threshold, and judges whether the current time is in the blank period, if yes, issues an opening trigger instruction, if no, enters the blank period and then issues the opening trigger signal again after the display panel 1 is heated, judges whether the current time is in the blank period when it is judged that the panel temperature is greater than or equal to the temperature threshold, if yes, issues the closing trigger signal, if no, enters the blank period and then issues the closing trigger signal again.

[0083] When the panel temperature of the display panel 1 changes, the resistance of the temperature sensing resistor Rx in the Wheatstone bridge circuit 14 also changes, the Wheatstone bridge circuit 14 is unbalanced, and the Wheatstone bridge circuit 14 outputs a first voltage, which can reflect the resistance of the temperature sensing resistor Rx and the size of the panel temperature. After obtaining the first voltage, the panel temperature corresponding to the first voltage can be obtained by searching in the pre-stored voltage-panel temperature mapping relationship, and the obtained panel temperature is the temperature of the current display panel 1.

[0084] It should be noted that in the embodiment of the present application, only one Wheatstone bridge circuit 14 can be provided, and the temperature sensing resistor Rx in the Wheatstone bridge circuit 14 can be arranged in the display area AA or the non-display area AA, and the panel temperature of the display panel 1 can be obtained by using the one Wheatstone bridge circuit 14.

[0085] Alternatively, the display area AA can also be divided into multiple partitions, and the temperature judgment unit 12 can be provided with multiple Wheatstone bridge circuits 14, and the temperature sensing resistors Rx in the multiple Wheatstone bridge circuits 14 can be arranged in different partitions of the display area AA. Based on this structure, the panel temperature of multiple partitions can be obtained by using the temperature sensing resistors Rx in the multiple Wheatstone bridge circuits 14. In one setting mode, the average value of the first voltages output by the multiple Wheatstone bridge circuits 14 can be calculated, and then the panel temperature can be obtained according to the average value, or multiple temperature values can be obtained according to the multiple first voltages output by the multiple Wheatstone bridge circuits 14, and then the maximum value of the multiple temperature values can be set as the current panel temperature of the display panel 1. This setting mode can separately sample the temperatures of different partitions, and can more accurately evaluate the panel temperature of the entire display panel 1.

[0086] In addition, it should be noted that the temperature acquisition sub-unit 15 and the triggering sub-unit 16 can be processing sub-units in a single-chip microcomputer, and the heating control unit 13 can be a power supply chip. When the heating control unit 13 receives the opening triggering instruction, the heating control unit 13 applies a corresponding heating signal to the heating wire 2 of the display panel 1 according to the information of the heating signal contained in the opening triggering instruction.

[0087] In one possible implementation, the processing unit 12 is further configured to generate a heating signal according to the panel temperature, wherein the duty cycle of the heating signal is negatively correlated with the panel temperature. The heating signal information contained in the opening triggering instruction includes the duty cycle information of the heating signal.

[0088] When the display panel 1 is in a low temperature state, the heating control unit 13 generates a heating signal corresponding to the panel temperature according to the panel temperature, the lower the panel temperature, the greater the duty cycle of the generated heating signal, and then the faster the heating electrode is heated after the heating signal is applied to the heating wire 2, which reduces the risk of characteristic failure of liquid crystal molecules at low temperature to a greater extent, and the heating effect on the display panel 1 is better.

[0089] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0090] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for driving a display panel, characterized in that: The driving process of the display panel includes a display period and a blank period; The display panel driving method includes: determining whether the panel temperature of the display panel is less than a temperature threshold, and if so, applying a heating signal to the heating traces in the display panel during the blank period; Continue to determine whether the temperature of the heated panel is less than the temperature threshold; if so, continue to heat the heating trace; if not, stop applying the heating signal to the heating trace during the blank period; When the panel temperature is lower than the temperature threshold, the process of applying the heating signal to the heating trace during the blank period includes: when the panel temperature is lower than the temperature threshold, determining whether the current moment is in the blank period; if so, applying the heating signal to the heating trace during the blank period; if not, applying the heating signal to the heating trace after entering the blank period; When the panel temperature is greater than or equal to the temperature threshold, the process of stopping applying the heating signal to the heating trace during the blank period includes: when the panel temperature is greater than or equal to the temperature threshold, determining whether the current moment is in the blank period; if so, stopping applying the heating signal to the heating trace during the blank period; if not, stopping applying the heating signal to the heating trace after entering the blank period.

2. The driving method according to claim 1, wherein: The driving process of the display panel includes multiple frames, one frame includes multiple row driving periods, the row driving period includes the display period and at least two row blank periods, the display period is located between two row blank periods, and a frame blank period is included between two adjacent frames; The blank period includes the line blank period and / or the frame blank period.

3. The driving method according to claim 1, wherein: When the panel temperature is lower than the temperature threshold, if the current moment is in the display period, then after entering the blank period adjacent to the display period, the heating signal is applied to the heating trace; When the panel temperature is greater than or equal to the temperature threshold, if the current moment is in the display period, the heating line stops applying the heating signal after entering the blank period adjacent to the display period.

4. The driving method according to claim 1, wherein: The process of judging whether the current moment is in the blank period includes: identifying whether the current moment is in the blank period according to the synchronization reference signal, the pixel clock signal and the flag signal.

5. The driving method according to claim 1, wherein: The process of applying the heating signal to the heating trace in the blank period includes: applying a heating voltage to the heating trace in succession in at least two blank periods, and the applied heating voltage increases gradually.

6. The driving method according to claim 1, wherein: The maximum voltage value of the heating signal is V max , 30V≤V max ≤35V.

7. The driving method of claim 1, wherein the determining whether the panel temperature is less than the temperature threshold comprises: outputting, by a Wheatstone bridge circuit, a first voltage according to a resistance value of a temperature sensing resistor; obtaining, according to a voltage-panel temperature mapping relationship, the panel temperature corresponding to the first voltage, and determining whether the panel temperature is less than the temperature threshold.

8. The driving method of claim 1, wherein when the panel temperature is less than the temperature threshold, the driving method further comprises: generating the heating signal according to the panel temperature, wherein a duty cycle of the heating signal is negatively correlated with the panel temperature. comprises: a display panel comprising a heating trace; 9. A display device, characterized by comprising: a driving module configured to determine whether a panel temperature of the display panel is less than a temperature threshold, and if so, apply a heating signal to the heating trace in a blank period, and continue to determine whether the panel temperature of the display panel after heating is less than the temperature threshold, and if so, continue to heat the heating trace, and if not, stop applying the heating signal to the heating trace in the blank period; the driving module comprises: a processing unit configured to: detect the panel temperature, and determine whether the panel temperature is less than the temperature threshold; when it is determined that the panel temperature is less than the temperature threshold, generate the heating signal, and determine whether the current time is in the blank period, and if so, issue an opening trigger signal containing heating signal information, and if not, enter the blank period and then issue the opening trigger signal; after heating the display panel, when it is determined that the panel temperature is greater than or equal to the temperature threshold, determine whether the current time is in the blank period, and if so, issue a closing trigger signal, and if not, enter the blank period and then issue the closing trigger signal; a heating control unit electrically connected to the processing unit, configured to apply the heating signal to the heating trace in response to the opening trigger signal, and stop applying the heating signal to the heating trace in response to the closing trigger signal.

10. The display device of claim 9, wherein the processing unit comprises: a Wheatstone bridge circuit comprising a temperature sensing resistor on the display panel, the Wheatstone bridge circuit configured to output a first voltage according to a resistance value of the temperature sensing resistor; a temperature obtaining subunit electrically connected to the Wheatstone bridge circuit, configured to obtain the panel temperature corresponding to the first voltage according to a voltage-panel temperature mapping relationship, and determine whether the panel temperature is less than the temperature threshold. ​ ​ ​ The triggering subunit is electrically connected with the temperature acquisition subunit and the heating control unit respectively, generates the heating signal when the panel temperature is less than the temperature threshold, and judges whether the current time is in the blank period. If yes, the opening triggering signal is issued, and if not, the opening triggering signal is issued after entering the blank period. After heating the display panel, it is judged that the panel temperature is greater than or equal to the temperature threshold, and whether the current time is in the blank period is judged. If yes, the closing triggering signal is issued, and if not, the closing triggering signal is issued after entering the blank period.

11. The display device of claim 9, wherein, The processing unit is further configured to generate the heating signal according to the panel temperature, and a duty cycle of the heating signal is negatively correlated with the panel temperature.

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