Display driving circuit, display module and control method of display driving circuit

Abstract

The invention discloses a display driving circuit, a display module and a control method of the display driving circuit. The display driving circuit is characterized in that the input end of a driving module is electrically connected with a first power line; a first electrode of the light-emitting module is electrically connected with the output end of the driving module, and a second electrode of the light-emitting module is electrically connected with the second power line; the input end of the data writing module is electrically connected with a data line, the output end of the data writing module is electrically connected with the driving module, and the control end of the data writing module is electrically connected with a first control signal line; the input end of the detection module is electrically connected with the control end of the data writing module; the input end of the processing module is electrically connected with the output end of the detection module; the input end of the compensation module is electrically connected with the output end of the processing module, the output end of the compensation module is electrically connected with the data line, and the compensation module is used for compensating the second voltage on the data line by using the voltage compensation value. According to the design, the display uniformity of the display panel can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display driving circuit, a display module and a control method of the display driving circuit. BACKGROUND

[0002] In the prior art, when the signal line in the display panel is transmitted, there is a voltage drop from the proximal end to the distal end due to the resistance of the line itself, and the voltage value in the signal line is different in different areas of the display panel, thereby affecting the display uniformity of the display panel. SUMMARY

[0003] The present application provides a display driving circuit, a display module and a control method of the display driving circuit, which can improve the display uniformity of the display panel.

[0004] The first aspect of the present application provides a display driving circuit, comprising: a driving module, an input end of the driving module being electrically connected to a first power line; a light-emitting module, a first electrode of the light-emitting module being electrically connected to an output end of the driving module, and a second electrode of the light-emitting module being electrically connected to a second power line; wherein the driving module is used to drive the light-emitting module to emit light in a light-emitting stage; a data writing module, an input end of the data writing module being used to be electrically connected to a data line, an output end of the data writing module being electrically connected to the driving module, and a control end of the data writing module being electrically connected to a first control signal line; wherein the data writing module is used to turn on in a data writing stage to write a data voltage in the data line to the control end of the driving module; a detection module, an input end of the detection module being electrically connected to the control end of the data writing module, and being used to obtain a first voltage of the control end of the data writing module; a processing module, an input end of the processing module being electrically connected to an output end of the detection module, and being used to generate a matched voltage compensation value according to at least the first voltage obtained by the detection module; and a compensation module, an input end of the compensation module being electrically connected to an output end of the processing module, and an output end of the compensation module being electrically connected to the data line, the compensation module being used to compensate a second voltage on the data line by using the voltage compensation value.

[0005] In an embodiment, the compensation module is specifically used to compensate the second voltage by using the voltage compensation value in the data writing stage; wherein the processing module is specifically used to generate the matched voltage compensation value according to at least the first voltage obtained by the detection module in the data writing stage; or the processing module is specifically used to generate the matched voltage compensation value according to at least the first voltage obtained by the detection module before the data writing stage.

[0006] Preferably, the processing module is specifically configured to generate the matched voltage compensation value according to the first voltage and a target data voltage obtained by the detecting module; wherein the target data voltage is a target input voltage of a control terminal of the driving module.

[0007] In an embodiment, the display driving circuit comprises a data storage module electrically connected with the processing module, wherein the data storage module at least stores a compensation table comprising a correspondence between the first voltage and the voltage compensation value, and the processing module determines the voltage compensation value matched with the first voltage according to the compensation table.

[0008] Preferably, the driving module, the light-emitting module, the data writing module, the detecting module and the compensation module are arranged in a display panel, and the processing module and the data storage module are arranged in a display driving chip.

[0009] In an embodiment, the processing module is specifically configured to generate the matched voltage compensation value in response to a difference between the first voltage and a matched voltage threshold being greater than a difference threshold.

[0010] In an embodiment, an output terminal of the data writing module is electrically connected with an input terminal of the driving module; the display driving circuit further comprises a threshold compensation module, wherein an input terminal of the threshold compensation module is electrically connected with an output terminal of the driving module, an output terminal of the threshold compensation module is electrically connected with a control terminal of the driving module, and a control terminal of the threshold compensation module is electrically connected with a control terminal of the data writing module; and the display driving circuit further comprises a voltage storage module, wherein a first terminal of the voltage storage module is electrically connected with the first power line, and a second terminal of the voltage storage module is electrically connected with the control terminal of the driving module.

[0011] Preferably, the display driving circuit further comprises a first initialization module electrically connected with the control terminal of the driving module, wherein the first initialization module is configured to input an initialization voltage to the control terminal of the driving module; a second initialization module electrically connected with the first electrode of the light-emitting module, wherein the second initialization module is configured to input the initialization voltage to the first electrode of the light-emitting module; a first light-emitting control module electrically connected between the first power line and the input terminal of the driving module, wherein the first light-emitting control module is configured to control conduction between the driving module and the first power line; and a second light-emitting control module electrically connected between the first electrode of the light-emitting module and the output terminal of the driving module, wherein the second light-emitting control module is configured to control conduction between the driving module and the light-emitting module.

[0012] The second aspect of the present application provides a display module, wherein the display module comprises the display driving circuit according to any one of the above embodiments.

[0013] The third aspect of the present application provides a control method of a display driving circuit, wherein the display driving circuit comprises a driving module, a light-emitting module and a data writing module, an input end and an output end of the driving module are electrically connected with a first power line and a first electrode of the light-emitting module respectively, a second electrode of the light-emitting module is electrically connected with a second power line, an input end, an output end and a control end of the data writing module are electrically connected with a data line, the driving module and a first control signal line respectively; the driving module is used for driving the light-emitting module to emit light in a light-emitting stage, and the data writing module is used for conducting to write a data voltage in the data line to the control end of the driving module in a data writing stage; the method comprises the following steps: obtaining a first voltage of the control end of the data writing module; generating a voltage compensation value matched with the first voltage according to at least the first voltage of the control end of the data writing module; and compensating a second voltage on the data line by using the voltage compensation value.

[0014] In an embodiment, the method comprises: obtaining the first voltage of the control end of the data writing module in a first stage of the data writing stage; generating the voltage compensation value matched with the first voltage according to at least the first voltage of the control end of the data writing module in a second stage of the data writing stage; and compensating the second voltage on the data line by using the voltage compensation value in a third stage of the data writing stage; or the method comprises: obtaining the first voltage of the control end of the data writing module before the data writing stage; generating the voltage compensation value matched with the first voltage according to at least the first voltage of the control end of the data writing module before the data writing stage; and compensating the second voltage on the data line by using the voltage compensation value in the data writing stage.

[0015] In an embodiment, the step of generating the voltage compensation value matched with the first voltage according to at least the first voltage of the control end of the data writing module comprises: generating the matched voltage compensation value in response to a difference between the first voltage and a matched voltage threshold being greater than a difference threshold.

[0016] In an embodiment, the step of generating the voltage compensation value matched with the first voltage according to at least the first voltage of the control end of the data writing module comprises: generating the voltage compensation value matched with the first voltage according to the first voltage of the control end of the data writing module and a target data voltage; wherein the target data voltage is a target input voltage of the control end of the driving module.

[0017] Unlike existing technologies, the beneficial effects of this application are as follows: This application obtains the first voltage by detecting the control terminal of the data writing module through the detection module, then the processing module generates a matching voltage compensation value based on the first voltage, and finally the compensation module compensates the second voltage of the data line with the voltage compensation value. This achieves the problem of insufficient data voltage writing caused by insufficient conduction of the data writing module by increasing data voltage compensation, thereby improving the voltage drop problem of the display panel and thus improving the display uniformity of the display panel. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of one embodiment of the display driving circuit of this application; Figure 2 This is a schematic diagram of one embodiment of the display panel of this application; Figure 3 This is a schematic diagram of another embodiment of the display driving circuit of this application; Figure 4 This is a schematic diagram of yet another embodiment of the display driving circuit of this application; Figure 5 This is a flowchart illustrating one embodiment of the control method for the display driving circuit of this application; Figure 6 This is a flowchart illustrating another embodiment of the control method for the display driving circuit of this application; Figure 7 This is a flowchart illustrating another embodiment of the control method for the display driving circuit of this application; Figure 8 yes Figure 3 A diagram illustrating a corresponding application scenario; Figure 9 yes Figure 8 Timing diagram of one embodiment corresponding to the middle part of the signal lines; Figure 10 yes Figure 4 A diagram illustrating a corresponding application scenario; Figure 11 yes Figure 10 Timing diagram of one embodiment corresponding to the middle part of the signal lines. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] In response to the problems mentioned in the background technology, the inventors have found that in existing pixel driving circuits, due to voltage drop, some data writing transistors cannot operate fully in the saturation region when used as switching transistors. This results in insufficient voltage written by these data writing transistors, leading to decreased brightness and poor display uniformity of the display panel.

[0021] For the above issues, please refer to Figure 1 , Figure 1 This is a schematic diagram of one embodiment of the display driving circuit of this application. Figure 2 This is a schematic diagram of one embodiment of the display panel of this application. The first aspect of this application provides a display driving circuit, which includes a driving module 110, a light-emitting module 120, a data writing module 130, a detection module 140, a processing module 150, and a compensation module 160. The input terminal of the driving module 110 is electrically connected to a first power line ELV1; the first electrode of the light-emitting module 120 is electrically connected to the output terminal of the driving module 110, and the second electrode of the light-emitting module 120 is electrically connected to a second power line ELV2; wherein, the driving module 110 is used to drive the light-emitting module 120 to emit light during the light-emitting phase; the input terminal of the data writing module 130 is electrically connected to a data line Vdata, the output terminal of the data writing module 130 is electrically connected to the driving module 110, and the control terminal of the data writing module 130 is electrically connected to a first control signal line S1; wherein, the data writing module 130 is used to conduct during the data writing phase to connect the data line Vdata. The data voltage in module a is written to the control terminal of the driving module 110; the input terminal of the detection module 140 is electrically connected to the control terminal of the data writing module 130, and is used to obtain the first voltage of the control terminal of the data writing module 130; the input terminal of the processing module 150 is electrically connected to the output terminal of the detection module 140, and is used to generate a matching voltage compensation value based at least on the first voltage obtained by the detection module 140; the input terminal of the compensation module 160 is electrically connected to the output terminal of the processing module 150, and the output terminal of the compensation module 160 is electrically connected to the data line Vdata, and the compensation module 160 is used to compensate the second voltage on the data line Vdata using the voltage compensation value.

[0022] Specifically, the input terminal of the data writing module 130 is electrically connected to the data line Vdata, the output terminal of the data writing module 130 is electrically connected to the driver module 110, and the control terminal of the data writing module 130 is electrically connected to the first control signal line S1. The first control signal line S1 provides a first control signal to control the data writing module 130 to be turned on or off. When the first control signal controls the data writing module 130 to be turned on, the data voltage on the data line Vdata is written to the driver module 110 through the data writing module 130. When the first control signal controls the data writing module 130 to be turned off, the data voltage on the data line Vdata cannot be written to the driver module 110. Ideally, when the data writing module 130 is turned on, the first control signal line S1 provides a first control signal that can control the data writing module 130 to be fully turned on, that is, the data writing module 130 is working. The interval is in its saturation region, but in reality, because the first control signal line S1 provides the first control signal to the data writing module 130 at different positions, there will be a voltage drop in the signal line during transmission. This results in a higher voltage value at the near end of transmission and a lower voltage value at the far end of transmission, and the voltage value shows a gradient decrease from near to far. The voltage value at the near end meets the working conditions of the data writing module 130, but the voltage value at the far end cannot meet the working conditions of the data writing module 130. As a result, the data writing module 130 at the far end cannot be fully turned on by the first control signal when it is turned on, that is, the degree of conduction is not 100%. The data voltage is not written sufficiently, and the voltage written by the control terminal of the driving module 110 is insufficient, which causes the brightness of the light-emitting module 120 at the far end to decrease. The display panel as a whole will have a problem of poor brightness uniformity. This application designs an input terminal of the detection module 140 that is electrically connected to the control terminal of the data writing module 130. This means the detection module 140 can acquire the first voltage at the control terminal of the data writing module 130 in real time. The first voltage at the control terminal of the data writing module 130 may differ at different locations. The detection module 140 then provides the first voltage to the processing module 150, which provides a corresponding voltage compensation value based on the first voltage. The processing module 150 further provides the voltage compensation value to the compensation module 160, which compensates the second voltage in the data line Vdata using the voltage compensation value. The second voltage is used for compensation. The voltage in the data line Vdata is compensated before writing to the driver module 110. In short, when a voltage drop is detected at the control terminal of the data writing module 130, a corresponding voltage compensation value is added to the data line Vdata. This increases the data voltage on the data line Vdata during writing to the driver module 110, compensating for insufficient conduction of the data writing module 130. As a result, after the data writing is completed, the voltage at the control terminal of the driver module 110 reaches the target value, meets the target brightness, and improves the brightness uniformity of the display panel.

[0023] In one embodiment, the processing module 150 is specifically used to: generate a matching voltage compensation value based at least on the first voltage obtained by the detection module 140 during the data writing phase; the compensation module 160 is specifically used to: compensate the second voltage using the voltage compensation value during the data writing phase.

[0024] Specifically, during the data writing phase, when the first control signal on the first control signal line S1 is the on-state voltage, the detection module 140 detects the first voltage as the on-state voltage. Then, the processing module 150 obtains a matching voltage compensation value based on the first voltage during the data writing phase. Finally, the compensation module 160 compensates the second voltage with the voltage compensation value during the data writing phase. This implementation puts the entire detection, processing, and compensation process into one phase, making the design relatively simple. However, the data voltage on the data line Vdata will exist in two phases: one is the second voltage detected by the detection module 140 and processed by the processing module 150, and the other is the second voltage plus the voltage compensation value after compensation by the compensation module 160. In other words, the data voltage on the data line Vdata will change throughout the data writing phase.

[0025] In another embodiment, the processing module 150 is specifically used to: generate a matching voltage compensation value based at least on the first voltage obtained by the detection module 140 before the data writing stage; the compensation module 160 is specifically used to: compensate the second voltage using the voltage compensation value during the data writing stage.

[0026] Specifically, before the data writing stage, when the first control signal on the first control signal line S1 is at the cutoff voltage, the detection module 140 detects the first voltage as the cutoff voltage. Then, the processing module 150 obtains a matching voltage compensation value based on the first voltage before the data writing stage. Finally, the compensation module 160 compensates the second voltage with the voltage compensation value during the data writing stage. This implementation places the detection and processing processes before the data writing stage and the compensation process during the data writing stage. That is, when the first control signal on the first control signal line S1 is at the conduction voltage and the data writing module 130 is turned on, the data voltage on the data line Vdata is already the second voltage plus the voltage compensation value. During the entire data writing stage, the data voltage on the data line Vdata is constant. Compared with the previous implementation, the average value of the data voltage during the entire data writing stage is larger, the charging speed is faster, and the detection and processing processes do not occupy the data writing stage time, which can significantly reduce the data writing stage time and help improve the refresh rate of the display panel. Preferably, the detection process and processing process in this embodiment can be performed simultaneously with the initialization stage, which is located before the data writing stage. The initialization stage is mainly used to initialize at least one of the control terminal of the driving module 110 and the first electrode of the light-emitting module 120.

[0027] Furthermore, the processing module 150 is specifically used to: generate a matching voltage compensation value based on the first voltage obtained by the detection module 140 and the target data voltage; wherein, the target data voltage is the target input voltage of the control terminal of the drive module 110.

[0028] Specifically, for the data writing module 130 at the same position on the display panel, its first voltage usually changes little. However, if the corresponding light-emitting module 120 is at different brightness levels, considering the influence of brightness, a larger data voltage is usually required at high brightness, that is, a larger target input voltage is required at the control terminal of the driving module 110. At low brightness, a smaller data voltage is usually required, that is, a smaller target input voltage is required at the control terminal of the driving module 110. Therefore, the voltage compensation value corresponding to different brightness levels needs to consider the influence of the target data voltage in addition to the first voltage. When the target data voltage is higher, the corresponding voltage compensation value should be higher. This implementation can achieve different voltage values ​​at different brightness levels, thereby ensuring good brightness uniformity at different brightness levels.

[0029] In one embodiment, the display driving circuit includes a data storage module 170, which is electrically connected to the processing module 150. The data storage module 170 stores at least a compensation table that includes the correspondence between a first voltage and a voltage compensation value. The processing module 150 determines a voltage compensation value that matches the first voltage based on the compensation table.

[0030] Specifically, the data storage module 170 stores at least a compensation table showing the correspondence between the first voltage and the voltage compensation value. The processing module 150 finds the voltage compensation value that matches the first voltage from the compensation table based on the first voltage. This compensation method has a fast compensation response speed, and the compensation process is imperceptible to the human eye.

[0031] Furthermore, the driving module 110, the light-emitting module 120, the data writing module 130, the detection module 140, and the compensation module 160 are disposed in the display panel, while the processing module 150 and the data storage module 170 are disposed in the display driver chip.

[0032] Specifically, the detection module 140, compensation module 160, driving module 110, light-emitting module 120, and data writing module 130 are arranged together in the display panel. This allows the positions of the detection module 140, compensation module 160, driving module 110, light-emitting module 120, and data writing module 130 to correspond, facilitating targeted detection and compensation, and helping to improve the brightness compensation effect of the display panel. The processing module 150 and data storage module 170 are placed in the display driver chip, that is, integrated into the existing display driver chip, without occupying additional space, which can reduce the size of the display product.

[0033] In some other implementations, there is a negative correlation between the first voltage and the voltage compensation value. Specifically, the larger the voltage drop of the first voltage, i.e., the smaller the value of the first voltage, the lower the conduction level of the data writing module 130, and the larger the voltage compensation value needs to be to compensate. Furthermore, there is a positive correlation between the target data voltage and the voltage compensation value. Specifically, the higher the brightness, the higher the target data voltage, and the larger the voltage compensation value required.

[0034] In one embodiment, the processing module 150 is specifically configured to: generate a matched voltage compensation value in response to the difference between the first voltage and the matched voltage threshold being greater than the difference threshold.

[0035] Specifically, in this implementation, compensation for the data line Vdata is only performed when the difference between the first voltage and the voltage threshold is large. If the difference between the first voltage and the voltage threshold is small, although there may be a situation where the data voltage is written too little, the human eye cannot perceive this, so no compensation is required. This helps to save power consumption of the display panel.

[0036] In one embodiment, see Figure 3 , Figure 3This is a schematic diagram of another embodiment of the display driving circuit of this application. The output terminal of the data writing module 130 is electrically connected to the input terminal of the driving module 110. The display driving circuit also includes a threshold compensation module 180, a voltage storage module 190, a first initialization module 210, a second initialization module 220, a first light emission control module 230, and a second light emission control module 240. The input terminal of the threshold compensation module 180 is electrically connected to the output terminal of the drive module 110, and the output terminal of the threshold compensation module 180 is electrically connected to the control terminal of the drive module 110. The control terminal of the threshold compensation module 180 is also electrically connected to the control terminal of the data writing module 130. The first terminal of the voltage storage module 190 is electrically connected to the first power line ELV1, and the second terminal of the voltage storage module 190 is electrically connected to the control terminal of the drive module 110. The first initialization module 210 is electrically connected to the control terminal of the drive module 110 and is used to input the initialization voltage Vref into the control terminal of the drive module 110. The second initialization module 220 is electrically connected to the first electrode of the light-emitting module 120 and is used to input the initialization voltage Vref into the first electrode of the light-emitting module 120. The control terminals of the first initialization module 210 and the second initialization module 220 are electrically connected to the second control terminal. Signal line S2, the second control signal in the second control signal line S2 is used to simultaneously control the first initialization module 210 and the second initialization module 220 to be turned on or off; the first light-emitting control module 230 is electrically connected between the first power supply line ELV1 and the input terminal of the drive module 110, wherein the first light-emitting control module 230 is used to control the conduction of the drive module 110 and the first power supply line ELV1; the second light-emitting control module 240 is electrically connected between the first electrode of the light-emitting module 120 and the output terminal of the drive module 110, wherein the second light-emitting control module 240 is used to control the conduction of the drive module 110 and the light-emitting module 120; the control terminals of the first light-emitting control module 230 and the second light-emitting control module 240 are electrically connected to the light-emitting control signal line EM, and the light-emitting control signal in the light-emitting control signal line EM is used to simultaneously control the first light-emitting control module 230 and the second light-emitting control module 240 to be turned on or off. The control terminals of the detection module 140 and the compensation module 160 are both electrically connected to the first control signal line S1, so that detection and compensation can be performed synchronously during the data writing stage. This implementation helps to reduce the number of control signal lines while ensuring the synchronization of the detection, compensation and data writing stages.

[0037] In one embodiment, see Figure 4 , Figure 4This is a schematic diagram of another embodiment of the display driving circuit of this application. The output terminal of the data writing module 130 is electrically connected to the input terminal of the driving module 110. The display driving circuit also includes a threshold compensation module 180, a voltage storage module 190, a first initialization module 210, a second initialization module 220, a first light emission control module 230, and a second light emission control module 240. The input terminal of the threshold compensation module 180 is electrically connected to the output terminal of the drive module 110, and the output terminal of the threshold compensation module 180 is electrically connected to the control terminal of the drive module 110. The control terminal of the threshold compensation module 180 is also electrically connected to the control terminal of the data writing module 130. The first terminal of the voltage storage module 190 is electrically connected to the first power line ELV1, and the second terminal of the voltage storage module 190 is electrically connected to the control terminal of the drive module 110. The first initialization module 210 is electrically connected to the control terminal of the drive module 110 and is used to input the initialization voltage Vref into the control terminal of the drive module 110. The second initialization module 220 is electrically connected to the first electrode of the light-emitting module 120 and is used to input the initialization voltage Vref into the first electrode of the light-emitting module 120. The control terminals of the first initialization module 210 and the second initialization module 220 are electrically connected to the second control terminal. Signal line S2, the second control signal in the second control signal line S2 is used to simultaneously control the first initialization module 210 and the second initialization module 220 to be turned on or off; the first light-emitting control module 230 is electrically connected between the first power supply line ELV1 and the input terminal of the drive module 110, wherein the first light-emitting control module 230 is used to control the conduction of the drive module 110 and the first power supply line ELV1; the second light-emitting control module 240 is electrically connected between the first electrode of the light-emitting module 120 and the output terminal of the drive module 110, wherein the second light-emitting control module 240 is used to control the conduction of the drive module 110 and the light-emitting module 120; the control terminals of the first light-emitting control module 230 and the second light-emitting control module 240 are electrically connected to the light-emitting control signal line EM, and the light-emitting control signal in the light-emitting control signal line EM is used to simultaneously control the first light-emitting control module 230 and the second light-emitting control module 240 to be turned on or off. The control terminal of the detection module 140 is connected to the second control signal line S2, and the control terminal of the compensation module 160 is connected to the first control signal line S1. That is to say, the detection and initialization phases are synchronized, and the compensation and data writing phases are synchronized. This implementation method helps to reduce the number of control signal lines while reducing the time of the data writing phase.

[0038] Of course, in some other implementations, the control terminals of the detection module 140 and the compensation module 160 can also be controlled separately using signal lines.

[0039] In one embodiment, the driving module 110, data writing module 130, detection module 140, compensation module 160, threshold compensation module 180, first initialization module 210, second initialization module 220, first light emission control module 230, and second light emission control module 240 all include thin-film transistors; the voltage storage module 190 includes a storage capacitor; the data storage module 170 includes a register; the processing module 150 includes a programmable array logic device; and the light emission module 120 includes a light-emitting diode. Of course, the above modules can also be other devices with similar functions.

[0040] In one embodiment, the first power line ELV1 is a positive power line ELVDD, the second power line ELV2 is a negative power line ELVSS, the first electrode of the light-emitting module 120 is an anode, and the second electrode of the light-emitting module 120 is a cathode.

[0041] In another embodiment, the first power line ELV1 is a negative power line ELVSS, the second power line ELV2 is a positive power line ELVDD, the first electrode of the light-emitting module 120 is a cathode, and the second electrode of the light-emitting module 120 is an anode.

[0042] A second aspect of this application provides a display module, which includes the display driving circuit described in any of the above embodiments. The details of the display driving circuit in the display module are not repeated here; please refer to the descriptions of the various embodiments above.

[0043] See Figure 1 and Figure 5 , Figure 5 This is a flowchart illustrating one embodiment of the control method for the display driving circuit of this application. A third aspect of this application provides a control method for a display driving circuit. The display driving circuit includes a driving module 110, a light-emitting module 120, and a data writing module 130. The input and output terminals of the driving module 110 are electrically connected to a first power line ELV1 and a first electrode of the light-emitting module 120, respectively. The second electrode of the light-emitting module 120 is electrically connected to a second power line ELV2. The input, output, and control terminals of the data writing module 130 are electrically connected to a data line Vdata, the driving module 110, and a first control signal line S1, respectively. The driving module 110 is used to drive the light-emitting module 120 to emit light during the light-emitting phase. The data writing module 130 is used to conduct during the data writing phase to write the data voltage in the data line Vdata into the control terminal of the driving module 110. The method of this application includes: S100: Obtain the first voltage at the control terminal of the data writing module 130.

[0044] Specifically, the control terminal of the data writing module 130 is detected to obtain a first voltage. For the display panel, the first voltage of the control terminal of the data writing module 130 at different positions is different. The reason is that there is a voltage drop in the first control signal line S1 that is electrically connected due to the transmission resistance. By obtaining the first voltage, the actual working state of the data writing module 130 can be clearly understood.

[0045] S200: Generate a voltage compensation value that matches the first voltage, at least based on the first voltage at the control terminal of the data writing module 130.

[0046] Specifically, a matching voltage compensation value is determined based on the first voltage. The voltage compensation value can be obtained by directly looking up the corresponding compensation table of the first voltage and the voltage compensation value, or it can be calculated by the functional relationship between the first voltage and the voltage compensation value. The functional relationship between the first voltage and the voltage compensation value can be determined by function fitting based on multiple test data.

[0047] S300: Compensates the second voltage on the data line Vdata using a voltage compensation value.

[0048] Specifically, a voltage compensation value is applied to the data line Vdata, resulting in a final data voltage that is the sum of the second voltage and the voltage compensation value. By using this method, the problem of insufficient voltage at the control terminal of the data writing module 130 is offset by compensating the data voltage, thereby improving the display uniformity of the display panel.

[0049] In one embodiment, see Figure 3 and Figure 6 , Figure 6 This is a flowchart illustrating another embodiment of the control method for the display driving circuit of this application. The display driving circuit includes an initialization stage, a data writing stage, and a light emission stage arranged sequentially. The method of this application includes: S110: In the first stage of the data writing phase, obtain the first voltage of the control terminal of the data writing module 130.

[0050] S210: In the second stage of the data writing phase, at least based on the first voltage of the control terminal of the data writing module 130, a voltage compensation value matching the first voltage is generated.

[0051] S310: In the third stage of the data writing phase, the second voltage on the data line Vdata is compensated using the voltage compensation value.

[0052] Specifically, all three steps are executed during the data writing phase: the first phase detects and acquires the first voltage, the second phase generates the voltage compensation value, and the third phase compensates the data line Vdata with the voltage compensation value. The entire control process is set during the data writing phase, which is convenient to control and has high synchronization.

[0053] In another embodiment, see Figure 4 and Figure 7 , Figure 7 This is a flowchart illustrating another embodiment of the control method for the display driving circuit of this application. The driving timing of the display driving circuit includes an initialization stage, a data writing stage, and a light emission stage set sequentially. The method of this application includes: S120: Before the data writing stage, obtain the first voltage at the control terminal of the data writing module.

[0054] S220: Before the data writing stage, at least based on the first voltage at the control terminal of the data writing module, a voltage compensation value matching the first voltage is generated.

[0055] S320: During the data writing phase, the voltage compensation value is used to compensate the second voltage on the data line.

[0056] Specifically, steps S120 and S220 are both set between the data writing phases. The detection and processing processes do not occupy the time of the data writing phase, which helps the display panel achieve a higher refresh rate. Preferably, steps S120 and S220 are executed during the initialization phase, which can share the time period with the existing initialization phase.

[0057] In one embodiment, step S200 includes: In response to the difference between the first voltage and the matched voltage threshold being greater than the difference threshold, a matched voltage compensation value is generated.

[0058] Specifically, if the difference between the first voltage and the matched voltage threshold is large, the data voltage is written less and affects the display uniformity, so a matched voltage compensation value needs to be generated for compensation. If the difference between the first voltage and the matched voltage threshold is small, the data voltage is written less and does not affect the display uniformity, so there is no need to generate a matched voltage compensation value for compensation. This can avoid compensation in all cases and reduce the power consumption of the display panel.

[0059] In one embodiment, step S200 includes: Based on the first voltage and the target data voltage at the control terminal of the data writing module 130, a voltage compensation value matching the first voltage is generated; wherein, the target data voltage is the target input voltage at the control terminal of the drive module 110.

[0060] Specifically, in addition to considering the compensation of the second voltage based on the first voltage, the required target input voltage may be different under different brightness levels, even if the first voltage remains unchanged. High brightness requires a higher voltage compensation value than low brightness. Therefore, considering the compensation based on the target data voltage can further refine the compensation effect on the uniformity of the display panel.

[0061] In one application scenario, combined Figure 3 , Figure 8 and Figure 9 , Figure 8 yes Figure 3 A diagram illustrating a corresponding application scenario. Figure 9 yes Figure 8 The timing diagram for one embodiment of the signal lines in the middle section is as follows: the driving module 110 is the first transistor T1, the data writing module 130 is the second transistor T2, the detection module 140 is the third transistor T3, the compensation module 160 is the fourth transistor T4, the threshold compensation module 180 is the fifth transistor T5, the first initialization module 210 is the sixth transistor T6, the second initialization module 220 is the seventh transistor T7, the first light-emitting control module 230 is the eighth transistor T8, the second light-emitting control module is the ninth transistor T9, the voltage storage module 190 is the storage capacitor C1, the light-emitting module 120 is the light-emitting diode (LED), the first power line ELV1 is the positive power line ELVDD, the second power line ELV2 is the negative power line ELVSS, and the upper... Each transistor is a P-type transistor, which is turned on at low level and turned off at high level. The entire timing sequence consists of an initialization phase t1, a data writing phase t2, and a light emission phase t3. The data writing phase t2 is further divided into a first phase t21, a second phase t22, and a third phase t23. In the first phase t21, the third transistor T3 is turned on and detects the first voltage at the control terminal of the second transistor T2. In the second phase t22, the processing module 150 generates a voltage compensation value based at least on the first voltage. In the third phase t23, the fourth transistor T4 uses the voltage compensation value to compensate for the second voltage on the data line Vdata. The dashed line representing the voltage value on the data line Vdata represents the solution in the prior art, while the solution implemented in this application is the solution. The entire process is completed in the data writing phase t2.

[0062] In another application scenario, combined with Figure 4 , Figure 10 and Figure 11 , Figure 10 yes Figure 4 A diagram illustrating a corresponding application scenario. Figure 11 yes Figure 10The timing diagram for one embodiment corresponding to the signal lines in the middle section shows that the driving module 110 is the first transistor T1, the data writing module 130 is the second transistor T2, the detection module 140 is the third transistor T3, the compensation module 160 is the fourth transistor T4, the threshold compensation module 180 is the fifth transistor T5, the first initialization module 210 is the sixth transistor T6, the second initialization module 220 is the seventh transistor T7, the first light-emitting control module 230 is the eighth transistor T8, the second light-emitting control module is the ninth transistor T9, the voltage storage module 190 is the storage capacitor C1, the light-emitting module 120 is the light-emitting diode (LED), the first power line ELV1 is the positive power line ELVDD, the second power line ELV2 is the negative power line ELVSS, and so on. Each transistor is a P-type transistor, which is turned on at low level and turned off at high level. The entire timing sequence consists of an initialization phase t1, a data writing phase t2, and a light emission phase t3. The initialization phase t1 is further divided into a first phase t11 and a second phase t12. In the first phase t11, the third transistor T3 is turned on and detects the first voltage at the control terminal of the second transistor T2. In the second phase t12, the processing module 150 generates a voltage compensation value based at least on the first voltage. In the data writing phase t2, the fourth transistor T4 uses the voltage compensation value to compensate for the second voltage on the data line Vdata. The dashed line representing the voltage value on the data line Vdata represents the solution in the prior art. The implementation in this application is the solution in which the detection and processing process is designed to occur in the initialization phase outside of the data writing phase.

[0063] Of course, in other applications, transistors can also be N-type transistors.

[0064] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A display drive circuit, characterized by comprising: The display driving circuit comprises: a driving module, an input end of the driving module being electrically connected to a first power line; a light-emitting module, a first electrode of the light-emitting module being electrically connected to an output end of the driving module, and a second electrode of the light-emitting module being electrically connected to a second power line; wherein the driving module is configured to drive the light-emitting module to emit light in a light-emitting stage; a data writing module, an input end of the data writing module being configured to be electrically connected to a data line, an output end of the data writing module being electrically connected to the driving module, and a control end of the data writing module being electrically connected to a first control signal line; wherein the data writing module is configured to be turned on to write a data voltage in the data line to the control end of the driving module in a data writing stage; a detection module, an input end of the detection module being electrically connected to the control end of the data writing module, and the detection module being configured to acquire a first voltage of the control end of the data writing module; a processing module, an input end of the processing module being electrically connected to an output end of the detection module, and the processing module being configured to generate a matched voltage compensation value according to at least the first voltage acquired by the detection module; a compensation module, an input end of the compensation module being electrically connected to an output end of the processing module, and an output end of the compensation module being electrically connected to the data line, and the compensation module being configured to compensate a second voltage on the data line by using the voltage compensation value.

2. The display driving circuit according to claim 1, wherein the compensation module is specifically configured to compensate the second voltage by using the voltage compensation value in the data writing stage; and the processing module is specifically configured to generate the matched voltage compensation value according to at least the first voltage acquired by the detection module in the data writing stage, or the processing module is specifically configured to generate the matched voltage compensation value according to at least the first voltage acquired by the detection module before the data writing stage; and preferably, the processing module is specifically configured to generate the matched voltage compensation value according to the first voltage acquired by the detection module and a target data voltage, and the target data voltage is a target input voltage of the control end of the driving module.

3. The display driving circuit according to claim 1, wherein The display driving circuit comprises: a data storage module, the data storage module being electrically connected to the processing module, and the data storage module storing at least a compensation table comprising a correspondence between the first voltage and the voltage compensation value, and the processing module determining the voltage compensation value matched with the first voltage according to the compensation table; preferably, the driving module, the light-emitting module, the data writing module, the detection module and the compensation module are arranged in a display panel, and the processing module and the data storage module are arranged in a display driving chip.

4. The display driving circuit according to claim 1, wherein the processing module is specifically configured to generate the matched voltage compensation value in response to a difference between the first voltage and a matched voltage threshold being greater than a difference threshold.

5. The display driving circuit according to claim 1, wherein An output terminal of the data writing module is electrically connected with an input terminal of the driving module; The display driving circuit further comprises: a threshold compensation module, an input terminal of the threshold compensation module is electrically connected with an output terminal of the driving module, an output terminal of the threshold compensation module is electrically connected with a control terminal of the driving module, and a control terminal of the threshold compensation module is electrically connected with a control terminal of the data writing module; a voltage storage module, a first terminal of the voltage storage module is electrically connected with the first power line, and a second terminal of the voltage storage module is electrically connected with the control terminal of the driving module; Preferably, the display driving circuit further comprises: a first initialization module, the first initialization module is electrically connected with the control terminal of the driving module, and the first initialization module is used for inputting an initialization voltage to the control terminal of the driving module; a second initialization module, the second initialization module is electrically connected with the first electrode of the light-emitting module, and the second initialization module is used for inputting the initialization voltage to the first electrode of the light-emitting module; a first light-emitting control module, the first light-emitting control module is electrically connected between the first power line and the input terminal of the driving module, and the first light-emitting control module is used for controlling the driving module and the first power line to be turned on; a second light-emitting control module, the second light-emitting control module is electrically connected between the first electrode of the light-emitting module and the output terminal of the driving module, and the second light-emitting control module is used for controlling the driving module and the light-emitting module to be turned on.

6. A display module, characterized by The display module comprises the display driving circuit according to any one of claims 1-5.

7. A control method of a display drive circuit, characterized by, The display driving circuit comprises a driving module, a light-emitting module, and a data writing module, an input terminal and an output terminal of the driving module are electrically connected with a first power line and a first electrode of the light-emitting module respectively, a second electrode of the light-emitting module is electrically connected with a second power line, and an input terminal, an output terminal, and a control terminal of the data writing module are electrically connected with a data line, the driving module, and a first control signal line respectively; the driving module is used for driving the light-emitting module to emit light in a light-emitting stage, and the data writing module is used for being turned on to write a data voltage in the data line to the control terminal of the driving module in a data writing stage; and the method comprises: acquiring a first voltage of the control terminal of the data writing module; generating a voltage compensation value matched with the first voltage according to at least the first voltage of the control terminal of the data writing module; compensating a second voltage on the data line by using the voltage compensation value.

8. The method according to claim 7, wherein the method comprises: in a first stage of the data writing stage, acquiring the first voltage of the control terminal of the data writing module; in a second stage of the data writing stage, generating the voltage compensation value matched with the first voltage according to at least the first voltage of the control terminal of the data writing module; in a third stage of the data writing stage, compensating the second voltage on the data line by using the voltage compensation value; or the method comprises: ​ Before the data writing stage, the first voltage of the control end of the data writing module is obtained; Before the data writing stage, a voltage compensation value matched with the first voltage is generated according to at least the first voltage of the control end of the data writing module; In the data writing stage, the second voltage on the data line is compensated by using the voltage compensation value.

9. The method of claim 7, wherein, The step of generating the voltage compensation value matched with the first voltage according to at least the first voltage of the control end of the data writing module comprises: In response to the difference between the first voltage and the matched voltage threshold being greater than a difference threshold, the matched voltage compensation value is generated.

10. The method of claim 7, wherein, The step of generating the voltage compensation value matched with the first voltage according to at least the first voltage of the control end of the data writing module comprises: The voltage compensation value matched with the first voltage is generated according to the first voltage of the control end of the data writing module and a target data voltage; wherein the target data voltage is a target input voltage of the control end of the driving module.

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