CN114613332B - Display panel, driving method thereof and display device - Google Patents
Display panel, driving method thereof and display device Download PDFInfo
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- CN114613332B CN114613332B CN202210194514.XA CN202210194514A CN114613332B CN 114613332 B CN114613332 B CN 114613332B CN 202210194514 A CN202210194514 A CN 202210194514A CN 114613332 B CN114613332 B CN 114613332B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
Abstract
The invention discloses a display panel, a driving method thereof and a display device, wherein the display panel comprises: a display area and a non-display area disposed around the display area; the display area comprises a plurality of scanning lines extending along a first direction and a plurality of data lines extending along a second direction; the scanning lines and the data lines are crossed to define pixel areas; the pixel region includes a pixel driving tube; a sensing switching tube; the control end of the sensing switch tube is electrically connected with the first end; the first end of the sensing switch tube is connected with a corresponding scanning line; the second end of the sensing switch tube is connected to the driving chip through a feedback line and is used for outputting voltage feedback information to the driving chip; the driving chip is used for adjusting the scanning signals of the scanning lines according to the voltage feedback information. The technical scheme provided by the invention is used for improving the compensation accuracy of the grid driving circuit.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel, a driving method thereof, and a display device.
Background
When the display panel is operated under certain conditions, there is a problem that the gate driving circuit (for example, ASG) is not driven enough; in the actual operation process, there are some conditions that there is no driving compensation for the gate driving circuit, such as after RA experiment (not limited to this condition); there are some conditions in which there is drive compensation, such as low temperature operation (not limited to this condition).
Conditions of driving compensation, such as low-temperature operation, and under-driving of the ASG circuit due to the driving characteristics of the TFT device; the existing driving compensation method is as follows: the IC internal program sets a driving compensation temperature starting value, calculates a current environment temperature value through an IC internal temperature sensing circuit and an algorithm, and improves the Vgh voltage and the CLK duty ratio to carry out driving compensation when the current environment temperature value reaches the set temperature starting value.
But the selection of the driving compensation temperature value and the selection of the VGh voltage and the CLK duty cycle compensation value in the program also need to be determined by repeated experiments, and the adjustment accuracy is low.
Disclosure of Invention
The embodiment of the invention provides a display panel, a driving method thereof and a display device, which are used for providing the accuracy of compensation of a grid driving circuit.
In a first aspect, an embodiment of the present invention provides a display panel, including: a display area and a non-display area disposed around the display area; the display area comprises a plurality of scanning lines extending along a first direction and a plurality of data lines extending along a second direction; the scanning lines and the data lines are crossed to define pixel areas; the pixel region includes a pixel driving tube;
a sensing switching tube; the control end of the sensing switch tube is electrically connected with the first end; the first end of the sensing switch tube is connected with a corresponding scanning line; the second end of the sensing switch tube is connected to the driving chip through a feedback line and is used for outputting voltage feedback information to the driving chip;
the driving chip is used for adjusting the scanning signals of the scanning lines according to the voltage feedback information.
In a second aspect, an embodiment of the present invention provides a driving method of a display panel, which is applicable to the display panel provided in any embodiment of the present invention, where the driving method includes:
in the process of scanning the scanning lines of the display panel row by row, voltage feedback information output by the sensing switch tube is obtained through a feedback line;
acquiring a feedback voltage value according to the voltage feedback information, and comparing the feedback voltage value with the voltage value of the current first power supply signal; obtaining the combination of the voltage value of the first power supply signal and the duty ratio of the first clock signal according to the comparison result;
and adjusting the scanning signal of the scanning line according to the combination of the voltage value of the first power supply signal and the duty ratio of the first clock signal.
In a third aspect, an embodiment of the present invention further provides a display apparatus, including a display panel provided by any embodiment of the present invention.
In the invention, a sensing switch tube is arranged on a display panel, specifically, a display area of the display panel comprises a scanning line extending along a first direction and a data line extending along a second direction, and each pixel area is defined by the intersection of the scanning line and the data line; the pixel region includes a pixel driving tube capable of driving the light emitting unit. The control end of the sensing switch tube is electrically connected with the first end and is connected to one scanning line of the display area, and the second end of the sensing switch tube is connected with the driving chip through the feedback line and can output voltage feedback information to the driving chip so that the driving chip can adjust scanning signals output by the scanning line. According to the embodiment, the sensing switch tube and the pixel driving tube are arranged to have the same driving environment (scanning signals), so that the signal output to the driving chip by the sensing switch tube can directly reflect the driven state of the pixel driving tube, the specific degree of the insufficient driving of the gate driving circuit is accurately obtained, the closed-loop compensation adjustment of the gate driving circuit on the pixel driving tube is realized according to the voltage feedback information, the scanning signals after compensation are obtained, and the compensation accuracy of the gate driving circuit is improved. In addition, the closed-loop compensation adjustment process does not need human intervention or repeated experiments, and effectively shortens the period of driving compensation.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a driving chip according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 8 is a schematic flow chart of a driving method of a display panel according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the prior art, the compensation threshold is set as a starting value for starting the driving compensation process. For example, if the driving compensation condition is low temperature operation, a temperature compensation threshold is set due to a phenomenon that the TFT is not sufficiently driven by the gate driving circuit because of a characteristic shift of the TFT at a low temperature, and when the ambient temperature is lower than the temperature compensation threshold, a compensation program in the IC is started to adjust a control signal input to the gate driving circuit, specifically, to increase a voltage value of the first power signal Vgh and a duty ratio of the first clock signal CLK to perform driving compensation.
In the driving compensation process, for the condition without driving compensation (for example, after RA test), after the driving compensation is added, the normal operation of the display module can be effectively ensured, for the condition with driving compensation (for example, low-temperature driving compensation), the problem of long driving compensation period and low accuracy can exist, specifically, because the selection value of the driving compensation temperature starting value in the driving chip program can be determined through repeated tests, the test period is long and the accuracy is low, and similarly, the voltage value of Vgh and the duty ratio of CLK can be determined through repeated tests, and the problem of long test period and low accuracy also exists. In addition, the mode of setting the compensation threshold value, the voltage value of Vgh and the duty ratio of CLK (CLK) by the test is low in applicability, and when the display panels of different substrate boards are matched, the driving chip needs to be subjected to test again for obtaining, so that the driving compensation efficiency is low.
To solve the above problems, an embodiment of the present invention provides a display panel including: a display area and a non-display area disposed around the display area; the display area comprises a plurality of scanning lines extending along a first direction and a plurality of data lines extending along a second direction; the scanning lines and the data lines are crossed to define each pixel area; the pixel region includes a pixel driving tube;
a sensing switching tube; the control end of the sensing switch tube is electrically connected with the first end; the first end of the sensing switch tube is connected with a corresponding scanning line; the second end of the sensing switch tube is connected to the driving chip through a feedback line and is used for outputting voltage feedback information to the driving chip;
the driving chip is used for adjusting the scanning signals of the scanning lines according to the voltage feedback information.
In the embodiment of the invention, a sensing switch tube is arranged on a display panel, specifically, a display area of the display panel comprises a scanning line extending along a first direction and a data line extending along a second direction, and each pixel area is defined by the intersection of the scanning line and the data line; the pixel region includes a pixel driving tube capable of driving the light emitting unit. The control end of the sensing switch tube is electrically connected with the first end and is connected to one scanning line of the display area, and the second end of the sensing switch tube is connected with the driving chip through the feedback line and can output voltage feedback information to the driving chip so that the driving chip can adjust scanning signals output by the scanning line. According to the embodiment, the sensing switch tube and the pixel driving tube are arranged to have the same driving environment (scanning signals), so that the signal output to the driving chip by the sensing switch tube can directly reflect the driven state of the pixel driving tube, the specific degree of the insufficient driving of the gate driving circuit is accurately obtained, the closed-loop compensation adjustment of the gate driving circuit on the pixel driving tube is realized according to the voltage feedback information, the scanning signals after compensation are obtained, and the compensation accuracy of the gate driving circuit is improved. In addition, the closed-loop compensation adjustment process does not need human intervention or repeated experiments, and effectively shortens the period of driving compensation.
The foregoing is the core idea of the present invention, and the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without making any inventive effort are intended to fall within the scope of the present invention.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention, as shown in fig. 1, the display panel includes a display area AA and a non-display area NA surrounding the display area AA, the display area AA includes a pixel area 11 arranged in an array, the display area includes a plurality of scan lines 12 extending along a first direction X and a plurality of data lines 13 extending along a second direction Y, the scan lines 12 and the data lines 13 intersect to define the pixel area 11 arranged in the array, and the pixel area 11 includes a pixel driving tube T1. Optionally, the pixel area 11 may further include an energy storage device such as a pixel electrode and a capacitor plate, so that the pixel area 11 can emit a display beam, which is not limited in this embodiment. Alternatively, in this embodiment, the display panel may be a liquid crystal display panel or an organic light emitting display panel, and the specific type of the display panel is not limited in this embodiment. The pixel driving tube T1 includes a control end, a first end and a second end, the scan line 12 adjacent thereto is connected to the control end of the pixel driving tube T1 for outputting a scan signal, the data line 13 adjacent thereto is connected to the first end of the pixel driving tube T1 for outputting a data signal, and the second end of the pixel driving tube T1 is electrically connected to the pixel electrode, thereby controlling the display of the pixel region 11.
It should be noted that the present embodiment further includes a sensing switch tube T0, and similarly, the sensing switch tube T0 includes a control end, a first end and a second end. In this embodiment, the control end of the sensing switch tube T0 is connected to the first end and connected to the corresponding scan line 11, so that the scan line 11 connected to the control end of the sensing switch tube T0 may be marked as a scan line S1 in this embodiment, and the scan line S1 drives a plurality of pixel driving tubes T1 as well, that is, the control ends of the plurality of pixel driving tubes T1 are connected to the scan line S1, that is, the scan line S1 can drive the pixel driving tubes T1 and the sensing switch tube T0 at the same time, that is, the driving pixel driving tubes T1 and the sensing switch tube T0 acquire the same scan signal, and have the same driving environment. The second end of the sensing switch tube T0 outputs voltage feedback information to the driving chip 14 through the feedback line D0, and then the control end of the sensing switch tube T0 is connected with the same scanning line S1 as the control end of the pixel driving tube T1, so that the same scanning signal can be obtained, and the driving environment where the pixel driving tube T1 is located can be directly obtained according to the voltage feedback information output to the driving chip 14 from the second end of the sensing switch tube T0, and even the capability of the display panel for driving the pixel driving tube T1 can be presumed. The voltage feedback information fed back by the sensing switch tube T0 is direct and accurate, so that the driving capability of the gate driving circuit 15 can be reflected in real time, and the driving chip 14 can regulate the scanning signal output by the gate driving circuit 15 to the scanning line 12 according to the voltage feedback information.
In the invention, only the self-adaptive driving compensation function of the driving chip 14 is required to be started, manual intervention is not required, no matter what condition the driving is insufficient, the driving is accurately obtained through the sensing switch tube T0, the grid driving circuit 15 is automatically closed-loop regulated through a program algorithm, the efficiency is higher, the starting value of a compensation program is not required to be obtained through trial and error, the voltage value of Vgh and the duty ratio of CLK are also not required to be obtained through trial and error, and the compensation process is more accurate.
Alternatively, the width-to-length ratio of the channel of the sensing switching tube may be smaller than the width-to-length ratio of the channel of the pixel driving tube. In this embodiment, the sensing switch tube T0 and the pixel driving tube T1 are in the same driving environment, and specifically, the gate of the sensing switch tube T0 and the gate of the pixel driving tube T1 are connected to the same scanning line S1, and if the performance of the sensing switch tube T0 and the performance of the pixel driving tube T1 are identical, the conduction states of the sensing switch tube T0 and the pixel driving tube T1 are identical. If the feedback information of the voltage output from the sensing switch tube T0 to the driving chip 14 is weak, it indicates that the driving force of the sensing switch tube T0 is insufficient, and at this time, the driving force of the pixel driving tube T1 is insufficient, and the scanning signal output from the gate driving circuit needs to be adjusted. For example, if the scanning signal is at a high level, the pixel driving tube T1 and the sensing switch tube T0 are turned on, the feedback line may detect that the voltage feedback signal is at a high level, and if the scanning signal has insufficient driving force, the sensing switch tube T0 may not be completely turned on, and if the feedback line does not detect the high level, it is indicated that the scanning signal may not turn on the pixel driving tube T1 or the sensing switch tube T0.
On the basis, when the sensing switch tube T0 is arranged, the width-to-length ratio of the channel of the sensing switch tube T0 is controlled to be smaller than that of the channel of the pixel driving tube T1. The sense switching tube T0 is more difficult to drive than the pixel driving tube T1, and under the same driving environment, the sense switching tube T0 recognizes the problem of insufficient driving earlier than the pixel driving tube T1. The pixel driving tube T1 is in charging deficiency (the scanning signal is weaker), the sensing switch tube T0 cannot be turned on earlier, so that the voltage feedback information fed back by the feedback line D0 shows voltage deficiency earlier, the driving chip 14 program is convenient to quickly and timely adjust the gate driving circuit, the pixel driving tube T1 is compensated by the scanning signal, the compensation accuracy of the gate driving circuit is improved, and preferably, the driving compensation process can be completed according to the voltage feedback information output by the sensing switch tube T0 under the condition that the pixel driving tube T1 does not have charging deficiency, so that the display panel can maintain a better display effect in a driving compensation stage in time, and the display stability of the display panel is improved.
Alternatively, the line width of the scan line S1 connected to the sensing switch transistor T0 may be larger than that of the other scan lines 12. With continued reference to fig. 1, since the scan line S1 provides scan signals for the sensing switch tube T0 and the pixel driving tube T1 at the same time, compared with other scan lines 12, the line load of the scan line S1 is larger, and the signal may be delayed more than that of the other scan lines 12, in this embodiment, the line width of the scan line S1 is larger than that of the other scan lines 12, and the delay problem of the scan line S1 can be compensated to a certain extent, so that the charging time of the sensing switch tube T0 is the same as the charging time of the pixel driving tube T1 connected with the other scan lines 12, and the accuracy of the voltage feedback information output from the sensing switch tube T0 to the driving chip 14 is further improved, thereby further improving the accuracy of the driving compensation of the pixel driving circuit.
As shown in fig. 2, fig. 2 is a schematic structural diagram of a driving chip according to an embodiment of the present invention, and optionally, the driving chip 14 may include: a sampling circuit 141 and an algorithm circuit 142; the sampling circuit 141 is configured to obtain a feedback voltage value according to the voltage feedback information; the algorithm circuit 142 is configured to compare the feedback voltage value with the current voltage value of the first power signal Vgh, and obtain a combination of the voltage value of the first power signal Vgh and the duty cycle of the first clock signal CLK according to the comparison result.
The present embodiment exemplifies a specific compensation process of the pixel driving circuit by the driving chip. In a specific example, the driving chip 14 may include a sampling circuit 141 and an algorithm circuit 142, where the sampling circuit 141 can collect voltage feedback information output by the sensing switch tube T0, and calculate a corresponding feedback voltage value according to the voltage information, and the algorithm circuit 142 compares the feedback voltage value with a data voltage output by the first data line D1, for example, if the sensing switch tube T0 is completely turned on under the control of the scan line S1, the scan signal (typically, the voltage value of the first power signal Vgh) output by the scan line S1 to the first end of the sensing switch tube T0 is output from the second end of the sensing switch tube T0 without any voltage drop, and at this time, the feedback voltage value is identical to the scan signal. Conversely, if the difference between the scan signal output by the scan line S1 and the feedback voltage value output by the sense switching tube T0 is larger, the problem of insufficient driving of the sense switching tube T0 can be more described. If the signal output to the sensing switch tube T0 through the scan line S1 is set to be a high level signal, the sensing switch tube T0 is turned on, when the sensing switch tube T0 is fully turned on, the feedback voltage value is a high level signal (the voltage value of the first power supply signal Vgh), when the sensing switch tube T0 cannot be fully turned on due to insufficient driving, the feedback voltage value cannot reach the high level signal, accordingly, the algorithm circuit 142 obtains the combination of the voltage value of the first power supply signal Vgh and the duty ratio of the first clock signal CLK according to the comparison result, so as to reduce the power consumption as much as possible under the condition of increasing the driving force, because the adjustment of the Vgh voltage value and the duty ratio of CLK has direct influence on the power consumption, the embodiment automatically selects the optimal Vgh voltage value and the CLK duty ratio through the automatic closed-loop adjustment in the driving chip 14, effectively reduces the power consumption, and avoids that the optimal Vgh voltage value and CLK duty ratio cannot be determined by manually setting the compensation threshold. In the embodiment, only the self-adaptive driving compensation function is started, no human intervention is needed, no matter what condition (such as low-temperature running condition) is not enough to be driven, the program algorithm can automatically perform closed-loop adjustment, and the efficiency is higher and more accurate.
Fig. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and optionally, the display panel may further include: a gate driving circuit 15 disposed in the non-display area NA; the gate driving circuit 15 includes a shift register 151 of a multistage cascade connection; the shift registers 151 are arranged in one-to-one correspondence with the scanning lines; the driving chip 14 is electrically connected with the shift register 151; the shift register 151 is configured to output the adjusted scan signal to the corresponding scan line according to a combination of the voltage value of the first power signal Vgh and the duty ratio of the first clock signal CLK.
The driving chip 14 sends a control signal to the gate driving circuit 15 through the gate driving circuit common wiring, so that each stage of the shift register 151 outputs a corresponding scanning signal to the corresponding scanning line 12 to drive each pixel driving tube. As shown in fig. 3, optionally, the driving chip 14 is electrically connected to the shift register 151 through a common wiring of the gate driving circuit; the common wiring of the grid driving circuit at least comprises a start Signal (STV) line, a first power signal line, a second power signal line, a first clock signal line and a second clock signal line; the voltage value of the first power supply signal Vgh output by the first power supply signal line is larger than that of the second power supply signal output by the second power supply signal line. In general, the first power signal Vgh is a high level with a fixed amplitude, and the second power signal Vgl is a low level with a fixed amplitude, so that the amplitude of the scanning signal can be controlled; the first clock signal CLK and the second clock signal XCLK have the same timing and opposite phases, and can control the duty ratio of the scan signal, and the driving chip 14 outputs the combination of the voltage value of the first power signal Vgh and the duty ratio of the first clock signal CLK to the gate driving circuit 15, so that the gate driving circuit 15 outputs the scan signal adjusted according to the first power signal Vgh and the first clock signal CLK to the corresponding scan line 12. Optionally, with continued reference to fig. 3, the feedback line D0 is disposed in the non-display area NA. Thereby avoiding the feedback line D0 from influencing the opening ratio and the display brightness of the display area AA and improving the display effect of the display panel. Alternatively, the feedback line D0 occupies a width of 2 μm to 3 μm in the non-display area NA. The feedback line D0 occupies only 2um to 3um in width in the non-display area NA, and does not affect the narrow frame arrangement of the display panel.
Optionally, the sensing switch tube T0 and the feedback line D0 are both disposed in the non-display area NA. Further, the influence of the sensing switch tube T0 and the feedback line D0 on the opening ratio and the display brightness of the display area AA is avoided, and the display effect of the display panel is improved.
Optionally, the display panel may further include: a gate drive circuit 15; the gate driving circuit 15 is located in the non-display area NA and is disposed near the first side L1 of the display area; the sensing switch tube T0 is arranged close to the second side L2 of the display area; the first side L1 and the second side L2 of the display area are disposed opposite to each other.
In an example of the present invention, if the sensing switch tube T0 is disposed in the non-display area NA, the sensing switch source T0 may be disposed on a side of the display area AA away from the audit driving circuit 15, and in this embodiment, the display area AA may include two opposite sides: a first side L1 and a second side L2; the gate driving circuit 15 is disposed near the first side L1 of the display area AA and is located in the non-display area NA, and the sensing switch tube T0 is disposed near the second side L2 of the display area AA. The gate driving circuit 15 and the sensing switch T0 are not disposed on the same side of the display area AA, so that the width of the non-display area NA on the same side is effectively reduced, and the sensing switch T0 is located at the tail end of the scan line 12. It should be noted that, because the head end of the scan line 12 receives the scan signal output by the gate driving circuit 15, the head end of the scan line 12 is not easy to have a problem of insufficient driving, or the head end of the scan line 12 has a stronger capability of driving the pixel driving tube T1 than the tail end of the scan line 12. A row of pixel driving tubes T1 is connected between the head and tail ends of the scan line 12, so that voltage drop is easy to occur, and the tail end of the scan line 12 is first under-driven. In this embodiment, the sensing switch tube T0 is disposed on the second side L2 of the display area AA, so that the sensing switch tube T0 can be connected to a portion near the tail end of the scan line 12, which is convenient for the sensing switch tube T0 to find out the driving deficiency in time, and is convenient for starting the driving compensation process in time, thereby improving the compensation efficiency and the compensation speed, and making the display panel have a better display effect.
In addition, as shown in fig. 4, fig. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention, where the gate driving circuit 15 and the sensing switch tube T0 may also be disposed on the same side of the display area AA, and fig. 4 shows a case where the gate driving circuit 15 and the sensing switch tube T0 are simultaneously disposed on the second side L2 of the display area AA. Of course, the gate driving circuit 15 and the sensing switch tube T0 may also be disposed on the first side L1 of the display area AA at the same time, which is not particularly limited in this embodiment. The present embodiment includes, but is not limited to, a scheme in which the gate driving circuit 15 and the sensing switching transistor T0 are disposed at opposite sides. Optionally, the feedback line D0 is disposed between the common lines of the gate driving circuit; the feedback line D0 and the grid driving circuit are arranged in the non-display area NA in a sharing way, only the space of 2-3 um is increased, the glass frame is not influenced, and the influence on the aperture opening ratio of the display area AA is avoided.
Fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and fig. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention, where the display panel may include at least one sensing switch tube T0; each of the sensing switching transistors T0 is connected to a corresponding scan line S1. As shown in fig. 1, only one sensing switch tube T0 may be provided in the present embodiment, so that under-driving conditions can be detected by the sensing switch tube T0 on the premise of ensuring a simple circuit. In addition, as shown in fig. 5 and 6, the display panel of the present embodiment may be provided with a plurality of sensing switching tubes T0 to further improve the detection accuracy of the under-driving condition of the pixel driving tube T1.
With continued reference to fig. 5 and 6, the driver chip 14 is optionally bound to the non-display area NA of the display panel; alternatively, the driving chip 14 is electrically connected to the display panel through the flexible wiring board 141. In this embodiment, the driving Chip 14 may be bonded to a substrate of the display panel to form a Chip On Glass (COG) package structure, or the driving Chip 14 may be fixed On the flexible circuit board 141 through a Chip On Flex (COF) package process, and the driving Chip 14 sends a control signal or a data signal to the display panel through the flexible circuit board 141 to drive and control the display panel.
Alternatively, the presence sensing switching transistor T0 is electrically connected to the row of scan lines 12 farthest from the driving chip 14. As shown in fig. 5 and 6, the driving chip 14 sends control signals (Vgh, vgl, CLK and XCLK) to the gate driving circuit 15 through the common wiring of the gate driving circuit, and the control signals are transmitted on the common wiring of the gate driving circuit to have a certain delay and signal reduction, so that the scanning signals output by the shift register 151 farthest from the driving chip 14 may have problems such as delay, and the corresponding scanning lines 12, that is, the scanning line 12 farthest from the driving chip 14 is most likely to show a problem of insufficient driving, and in this embodiment, the scanning line 12 farthest from the driving chip 14 is provided with the corresponding sensing switch tube T0, so that the problem of insufficient driving is conveniently and rapidly found, thereby facilitating driving compensation and improving the display effect of the display panel.
Fig. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention, where in the embodiment of the present invention, when a plurality of sensing switch tubes T0 are provided, the display panel includes a plurality of sensing switch tubes T0; the sensing switch tubes T0 are connected with the scanning lines in a one-to-one correspondence. That is, each sensing switch tube T0 is responsible for the driving deficiency detection of the pixel driving tube T1 on the corresponding scanning line 12, so that the driving state detection can be performed on the pixel driving tubes T1 connected to the plurality of rows of scanning lines 12 at the same time, so that the driving deficiency condition can be found in time, and the driving compensation can be performed. In this embodiment, as shown in fig. 5, the corresponding sensing switch tubes T0 may be disposed on each of the adjacent rows of scanning lines 12, so as to detect the pixel driving tubes T1 that are easy to be driven insufficiently, or, as shown in fig. 7, the sensing switch tubes T0 may be disposed on each of the at least one row of scanning lines 12, so that the sensing switch tubes T0 are uniformly disposed in a certain area, thereby facilitating detection of the driving state of the area and even the whole display panel, and improving detection accuracy, so as to improve the driving compensation effect.
As shown in fig. 6, the display panel may optionally include a plurality of sensing switching tubes T0; at least two sensing switch tubes T0 are connected with the same scanning line S1; at least two sensing switching tubes T0 connected with the same scanning line S1 are electrically connected with the driving chip 14 through feedback lines D0 in one-to-one correspondence. In this embodiment, at least two sensing switch tubes T0 may be disposed on one scan line S1, two sensing switch tubes T0 are illustrated in fig. 6 as an example, the sensing switch tube T0 connected to the same scan line S1 is connected to the same data line 13, each sensing switch tube T0 is disposed with a feedback line D0 corresponding to each other, and each sensing switch tube T0 outputs voltage feedback information through its dedicated feedback line D0, so that output signals of the sensing switch tubes T0 do not interfere with each other, improving measurement accuracy, and in addition, when the same pixel driving tube T1 is measured through multiple sensing switch tubes T0, misjudgment of insufficient driving condition when one sensing switch tube T0 fails, for example, when one sensing switch tube T0 fails, the voltage feedback information output by the sensing switch tube T0 is not used as a reference, but the voltage feedback information output by other sensing switch tubes T0 working normally is used for driving compensation adjustment parameters.
Based on the same conception, the embodiment of the invention also provides a driving method of the display panel, which is suitable for the display panel provided by any embodiment of the invention. Fig. 8 is a flow chart of a driving method of a display panel according to an embodiment of the invention, as shown in fig. 8, the method of the embodiment includes the following steps:
step S110, in the process of scanning the scanning lines of the display panel row by row, voltage feedback information output by the sensing switch tube is obtained through the feedback line.
Step S120, a feedback voltage value is obtained according to the voltage feedback information, and the feedback voltage value is compared with the voltage value of the current first power supply signal; and obtaining the combination of the voltage value of the first power supply signal and the duty ratio of the first clock signal according to the comparison result.
Step S130, the scanning signal of the scanning line is adjusted according to the combination of the voltage value of the first power supply signal and the duty ratio of the first clock signal.
In the embodiment of the invention, a sensing switch tube is arranged on a display panel, specifically, a display area of the display panel comprises a scanning line extending along a first direction and a data line extending along a second direction, and each pixel area is defined by the intersection of the scanning line and the data line; the pixel region includes a pixel driving tube capable of driving the light emitting unit. The control end of the sensing switch tube is electrically connected with the first end and is connected to one scanning line of the display area, and the second end of the sensing switch tube is connected with the driving chip through the feedback line and can output voltage feedback information to the driving chip so that the driving chip can adjust scanning signals output by the scanning line. According to the embodiment, the sensing switch tube and the pixel driving tube are arranged to have the same driving environment (scanning signals), so that the signal output to the driving chip by the sensing switch tube can directly reflect the driven state of the pixel driving tube, the specific degree of the insufficient driving of the gate driving circuit is accurately obtained, the closed-loop compensation adjustment of the gate driving circuit on the pixel driving tube is realized according to the voltage feedback information, the scanning signals after compensation are obtained, and the compensation accuracy of the gate driving circuit is improved. In addition, the closed-loop compensation adjustment process does not need human intervention or repeated experiments, and effectively shortens the period of driving compensation.
The embodiment of the invention also provides a display device. Fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 9, the display device according to an embodiment of the present invention includes a display panel 1 according to any embodiment of the present invention. The display device may be a display screen of a mobile phone as shown in fig. 9, or may be a display screen of an electronic device such as a computer, a television, or an intelligent wearable device, which is not limited in this embodiment.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (15)
1. A display panel, comprising: a display area and a non-display area disposed around the display area; the display area comprises a plurality of scanning lines extending along a first direction and a plurality of data lines extending along a second direction; the scanning lines and the data lines are crossed to define pixel areas; the pixel region includes a pixel driving tube;
a sensing switching tube; the control end of the sensing switch tube is electrically connected with the first end; the first end of the sensing switch tube is connected with a corresponding scanning line; the second end of the sensing switch tube is connected to the driving chip through a feedback line and is used for outputting voltage feedback information to the driving chip;
the driving chip is used for adjusting the scanning signals of the scanning lines according to the voltage feedback information;
the width-to-length ratio of the channel of the sensing switch tube is smaller than that of the channel of the pixel driving tube.
2. The display panel according to claim 1, wherein a line width of a scanning line connected to the sensing switching tube is larger than that of other scanning lines.
3. The display panel of claim 1, wherein the driving chip comprises: a sampling circuit and an algorithm circuit;
the sampling circuit is used for acquiring a feedback voltage value according to the voltage feedback information;
the algorithm circuit is used for comparing the feedback voltage value with the voltage value of the current first power supply signal and obtaining the combination of the voltage value of the first power supply signal and the duty ratio of the first clock signal according to the comparison result.
4. A display panel according to claim 3, further comprising: the grid driving circuit is arranged in the non-display area;
the grid driving circuit comprises a multistage cascade shift register; the shift registers are arranged in one-to-one correspondence with the scanning lines;
the driving chip is electrically connected with the shift register; the shift register is used for outputting an adjusted scanning signal to a corresponding scanning line according to the combination of the voltage value of the first power supply signal and the duty ratio of the first clock signal.
5. The display panel of claim 4, wherein the driving chip is electrically connected to the shift register through a gate driving circuit common trace;
the grid driving circuit common wiring at least comprises a starting signal line, a first power signal line, a second power signal line, a first clock signal line and a second clock signal line; the voltage value of the first power supply signal output by the first power supply signal line is larger than the voltage value of the second power supply signal output by the second power supply signal line;
the feedback line is arranged between the common wirings of the grid driving circuit; the feedback line and the grid driving circuit are arranged in the non-display area in a common way.
6. The display panel according to claim 5, wherein the feedback line occupies a width of 2 μm to 3 μm in the non-display area.
7. The display panel of claim 1, wherein the sense switching tube and the feedback line are both disposed in a non-display region.
8. The display panel of claim 1, further comprising: a gate driving circuit; the grid driving circuit is positioned in the non-display area and is arranged close to the first side of the display area;
the sensing switch tube is arranged close to the second side of the display area; the first side and the second side of the display area are disposed opposite to each other.
9. The display panel of claim 1, wherein the display panel comprises at least one of the sense switching tubes; each sensing switch tube is connected with a corresponding scanning line.
10. The display panel of claim 9, wherein the driver chip is bound to a non-display region of the display panel; or alternatively, the process may be performed,
the driving chip is electrically connected with the display panel through a flexible circuit board.
11. The display panel of claim 10, wherein a presence sensing switching tube is electrically connected to a row of scan lines furthest from the driving chip.
12. The display panel of claim 9, wherein the display panel comprises a plurality of the sense switching tubes; the sensing switch tubes are connected with the scanning lines in a one-to-one correspondence.
13. The display panel of claim 9, wherein the display panel comprises a plurality of the sense switching tubes; at least two sensing switch tubes are connected with the same scanning line;
at least two sensing switch tubes connected with the same scanning line are electrically connected with the driving chip through feedback lines in one-to-one correspondence.
14. A driving method of a display panel, characterized in that it is applied to the display panel according to any one of the preceding claims 1 to 13, the driving method comprising:
in the process of scanning the scanning lines of the display panel row by row, voltage feedback information output by the sensing switch tube is obtained through a feedback line;
acquiring a feedback voltage value according to the voltage feedback information, and comparing the feedback voltage value with the voltage value of the current first power supply signal; obtaining the combination of the voltage value of the first power supply signal and the duty ratio of the first clock signal according to the comparison result;
and adjusting the scanning signal of the scanning line according to the combination of the voltage value of the first power supply signal and the duty ratio of the first clock signal.
15. A display device comprising the display panel of any one of claims 1-13.
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