Display module, compensation method thereof and display device

Abstract

The invention provides a display module, a compensation method thereof and a display device, and belongs to the technical field of display. The display driver in the display module can sense the migration rate of the transistor in the pixel and can compensate the driving current output by the driving transistor in the pixel based on the sensed migration rate and the compensation parameter, so that the uniformity of the driving current output by the driving transistors in different pixels can be better, and the display effect of the display module is improved. Therefore, the uniformity of the luminance of the light-emitting elements in different pixels is good, and the problem that the display effect of the display module is poor due to the fact that migration rates of transistors in different pixels are not uniform due to the influence of the technology is solved. In other words, the display effect of the display module provided by the invention can be better.

Description

Technical Field

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

[0002] The display module generally includes a plurality of pixels, each pixel generally includes a plurality of transistors and a light-emitting element, and the plurality of transistors are used to cooperate with each other to drive the light-emitting element to emit light, so that the display module displays a picture.

[0003] However, in the process of manufacturing the display module, due to the influence of the process, it is difficult for the transistors in different pixels to achieve uniform performance (e.g., threshold voltage Vth / mobility K), that is, the performance of the transistors in different pixels may be non-uniform. As a result, the uniformity of the luminous brightness of the light-emitting elements in different pixels is poor, which in turn leads to poor display effects of the display module. Summary of the invention

[0004] Provided are a display module and a compensation method thereof, and a display device, which can solve the problem in the related art that the display effect of the display module is poor due to the uneven performance of transistors in different pixels.

[0005] The technical solution is as follows:

[0006] In one aspect, a display module is provided, the display module comprising:

[0007] A display substrate, including adjacent display areas and fan-out areas;

[0008] A plurality of pixels are located in the display area, the pixels comprising a driving transistor and a light-emitting element, the driving transistor is connected to the light-emitting element and is used to output a driving current to the light-emitting element to drive the light-emitting element to emit light;

[0009] A plurality of sensing lines are located in the display area and the fan-out area;

[0010] a display driver connected to the plurality of pixels through the plurality of sensing lines and configured to sense the mobility of a driving transistor in each of the pixels through the plurality of sensing lines, determine a compensation value based on the sensed mobility and a compensation parameter, and compensate a driving current output by the driving transistor in each of the pixels based on the compensation value to achieve mobility compensation;

[0011] The compensation parameter is a parameter determined based on a geometric parameter of each sensing line among the plurality of sensing lines, and the geometric parameter includes: a line length related to an equivalent capacitance of the sensing line.

[0012] Optionally, the compensation parameter is a compensation gain value designed and determined based on a difference in line lengths of the sensing lines, and for each of the sensing lines, the compensation gain value is negatively correlated with an equivalent capacitance of the sensing line;

[0013] The display driver is used for: for each of the sensing lines, applying a corresponding compensation gain value to the mobility sensed by the sensing line to obtain a target mobility, and determining the compensation value based on the target mobility.

[0014] Optionally, the display driver is used for: for each of the sensing lines, multiplying the mobility sensed by the sensing line by a corresponding compensation gain value to obtain the target mobility.

[0015] Optionally, the geometric parameter further includes: a line width related to an equivalent capacitance of the sensing line; the compensation parameter is an equivalent capacitance of each sensing line determined based on a simulation of a line length and a line width of each sensing line;

[0016] The display driver is used for: for each of the sensing lines, applying the capacitance difference between the equivalent capacitance of the sensing line and the equivalent capacitance of other sensing lines, and the mobility sensed by the sensing line to a mobility compensation algorithm to obtain the compensation value.

[0017] Optionally, the display driver is further configured to: sense a threshold voltage of a driving transistor in each of the pixels through the plurality of sensing lines, and determine the compensation value based on the sensed threshold voltage, the sensed mobility and the compensation parameter.

[0018] Optionally, the display driver is used to: for each of the sensing lines, determine a compensated threshold voltage value based on a threshold voltage sensed by the sensing line, determine a compensated mobility value based on the mobility sensed by the sensing line and the compensation parameter, and determine the compensation value based on the compensated threshold voltage value and the compensated mobility value.

[0019] Optionally, the display driver is configured to: sense a sensing voltage output by a driving transistor in each of the pixels through the plurality of sensing lines, and determine a mobility and a threshold voltage of the driving transistor in each of the pixels based on the sensing voltage.

[0020] Optionally, the second electrode of the driving transistor is connected to the first electrode of the light emitting element, the first electrode of the driving transistor is connected to the pull-up power supply terminal, and the second electrode of the light emitting element is connected to the pull-down power supply terminal; the pixel further includes: a sensing transistor;

[0021] The sensing transistor is respectively connected to the second electrode of the driving transistor and the sensing line, and is also connected to a sensing scanning end, and is used to control the on-off of the second electrode of the driving transistor and the sensing line in response to a sensing scanning signal provided by the sensing scanning end, so that the display driver can sense the sensing voltage output by the driving transistor in the pixel through the sensing line.

[0022] Optionally, the display module further includes:

[0023] A plurality of data lines are located in the display area and the fan-out area;

[0024] The display driver is also connected to the plurality of pixels through the plurality of data lines, and is used to provide a data signal to the driving transistor in each of the pixels through the plurality of data lines based on the compensation value, so as to compensate the driving current output by the driving transistor in each of the pixels.

[0025] Optionally, the pixel further comprises: a data writing transistor;

[0026] The data writing transistor is respectively connected to the gate of the driving transistor and the data line, and is also connected to the display scanning end, and is used to control the on and off of the gate of the driving transistor and the data line in response to the display scanning signal provided by the display scanning end, so that the display driver can provide the data signal to the driving transistor in the pixel through the data line.

[0027] Optionally, the display driver comprises: a sensing compensation unit and a driving control unit;

[0028] The sensing compensation part is connected to the plurality of pixels through the plurality of sensing lines, and the sensing compensation part is also connected to the driving control part;

[0029] The sensing compensation part is used to: sense the mobility of the driving transistor in each of the pixels through the plurality of sensing lines;

[0030] The drive control unit is used to: determine a compensation value based on the mobility sensed by the plurality of sensing lines and the compensation parameter;

[0031] The sensing compensation unit is further configured to compensate a driving current output by a driving transistor in each of the pixels based on the compensation value.

[0032] Optionally, the sensing compensation unit includes: a source driver; and the driving control unit includes: a timing controller.

[0033] Optionally, an equivalent capacitance of a portion of each sensing line in the display area among the plurality of sensing lines is greater than a capacitance threshold, so that an influence of a capacitance difference of the equivalent capacitances of the sensing lines on compensation is less than an influence threshold.

[0034] In another aspect, a compensation method for a display module is provided, which is applied to the display module as described in the above aspect, and the method comprises:

[0035] sensing the mobility of the driving transistor in each pixel through a plurality of sensing lines;

[0036] determining a compensation value based on the sensed mobility and a compensation parameter;

[0037] Compensating a driving current output by a driving transistor in each of the pixels based on the compensation value to achieve mobility compensation;

[0038] The compensation parameter is a parameter determined based on a geometric parameter of each sensing line among the plurality of sensing lines, and the geometric parameter includes: a line length related to an equivalent capacitance of the sensing line.

[0039] In another aspect, a display device is provided, the display device comprising: a power supply component, and the display module as described in the above aspect;

[0040] The power supply component is connected to the display module and is used to supply power to the display module.

[0041] In summary, the beneficial effects brought about by the technical solution provided by this application may at least include:

[0042] A display module and a compensation method and a display device thereof are provided. Since the display driver in the display module can sense the mobility of the transistor in the pixel, and can compensate the driving current output by the driving transistor in the pixel based on the sensed mobility and compensation parameters, the driving current output by the driving transistor in different pixels can be made more uniform, and then the luminous brightness of the light-emitting elements in different pixels can be made more uniform, solving the problem of poor display effect of the display module caused by uneven mobility of transistors in different pixels due to process influence. That is, the display effect of the display module provided by the present application can be better. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 is a structural schematic diagram of a display module provided in an embodiment of the present application;

[0045] Figure 2 is a schematic diagram of a circuit structure of a pixel provided in an embodiment of the present application;

[0046] Figure 3 is a timing diagram of driving a pixel provided in an embodiment of the present application;

[0047] Figure 4 It is a schematic diagram of a layout of a local structure of a display module provided in an embodiment of the present application;

[0048] Figure 5 This is a method provided by the embodiment of the present application. Figure 4 A magnified view of the middle area of ​​the COF region is shown;

[0049] Figure 6 This is a method provided by the embodiment of the present application. Figure 4 A magnified view of the edge area of ​​the COF region shown;

[0050] Figure 7 This is a schematic diagram of a display module with poor display effect provided by an embodiment of the present application;

[0051] Figure 8 is a curve diagram of a compensation gain value based on line length design provided in an embodiment of the present application;

[0052] Fig. 9 is a schematic diagram of the structure of another display module provided in an embodiment of the present application;

[0053] Fig.10 is a flow chart of a compensation method for a display module provided in an embodiment of the present application;

[0054] Fig.11 is a flow chart of another compensation method for a display module provided in an embodiment of the present application;

[0055] Fig.12 is a flow chart of another compensation method for a display module provided in an embodiment of the present application;

[0056] Fig.13 It is a structural schematic diagram of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0057] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0058] It should be noted that the transistors used in all embodiments of the present application can be thin film transistors (TFT) or field effect transistors or other devices with the same characteristics. According to the role in the circuit, the transistors used in the embodiments of the present application are mainly switching transistors. Since the source and drain of the switching transistor are symmetrical, the source and drain are interchangeable, and the source is referred to as the first pole and the drain is referred to as the second pole, or the drain is referred to as the first pole and the source is referred to as the second pole. According to the form in the accompanying drawings, the middle end of the transistor is defined as the gate, the signal input end is the source, and the signal output end is the drain. In addition, the switching transistors used in the embodiments of the present application may include any one of a P-type transistor and an N-type transistor or a combination thereof. Among them, the P-type transistor is turned on when the gate is a low voltage and is turned off when the gate is a high voltage, and the N-type transistor is turned on when the gate is a high voltage and is turned off when the gate is a low voltage.

[0059] The present application embodiment provides a display module. Figure 1 As shown, the display module includes: a display substrate 01 , a plurality of pixels 02 , a plurality of sense lines (SL) and a display driver 03 .

[0060] The display substrate 01 includes adjacent display areas AA and fan-out areas. Figure 1 , the Fanout area shown is located below the display area AA and adjacent to the display area AA. Of course, the display area AA and the Fanout area are not limited to Figure 1 The position relationship shown.

[0061] It is understandable that the COF area refers to the application area of ​​the chip on film technology, which can fix the integrated circuit on a circuit board (such as a flexible circuit board).

[0062] Continue to refer Figure 1 , the plurality of pixels 02 are located in the display area AA. Figure 1 Based on Figure 2 It can be seen that each pixel 02 includes a driving transistor T1 and a light emitting element L1. The driving transistor T1 is connected to the light emitting element L1 and is used to output a driving current to the light emitting element L1 to drive the light emitting element L1 to emit light.

[0063] For example, the second electrode of the driving transistor T1 can be connected to the first electrode of the light emitting element L1, the first electrode of the driving transistor T1 can be connected to the pull-up power supply terminal ELVDD, the gate of the driving transistor T1 can be used to receive the data signal provided by the data line Data, and the second electrode of the light emitting element L1 can be connected to the pull-down power supply terminal ELVSS. On this basis, the driving transistor T1 can transmit a light emitting drive signal (e.g., a drive current) to the light emitting element L1 based on the data signal received by the gate and the pull-up power supply signal provided by the pull-up power supply terminal ELVDD, thereby driving the light emitting element L1 to emit light under the voltage difference between the light emitting drive signal and the pull-down power supply signal provided by the pull-down power supply terminal ELVSS.

[0064] Optionally, the light-emitting element L1 may be, for example, an organic light-emitting diode (OLED), or an active-matrix organic light-emitting diode (AMOLED). The embodiment of the present application does not limit the type of the light-emitting element L1. The first electrode of the light-emitting element L1 may be an anode, and the second electrode may be a cathode. Of course, the first electrode and the second electrode may also be interchangeable.

[0065] Continue to refer Figure 1 The plurality of sensing lines SL are located in the display area AA and the Fanout area. Furthermore, the display driver 03 is connected to the plurality of pixels 02 through the plurality of sensing lines SL and is used to sense the mobility K of the driving transistor T1 in each pixel 02 through the plurality of sensing lines SL.

[0066] For example, combined with Figure 1 and Figure 2 , the multiple pixels 02 included in the display module can be arranged in an array, that is, the display module can include multiple rows and columns of pixels 02. And, the display module can include multiple sensing lines SL connected to the multiple columns of pixels 02 in a one-to-one correspondence. That is, the display driver 03 can be connected to a column of pixels 02 through each sensing line SL, and can be connected to different columns of pixels 02 through different sensing lines SL. In addition, the display driver 03 can be connected to the second electrode of the driving transistor T1 through each sensing line SL to sense the mobility K of the driving transistor T1 through the sensing line SL. Of course, it is not limited to the one-to-one connection here. Optionally, the display driver 03 can be set independently of the display substrate 01.

[0067] Generally, one or more chip on film (COF) areas arranged at intervals along the pixel row direction X1 may be provided in the Fanout area to fix the integrated circuit on a circuit board (e.g., a flexible circuit board). Accordingly, the Fanout area is also called a COF Fanout area. Multiple sensing lines SL may extend to one side of the display driver 03 through the display area AA and the COF area provided in the Fanout area to establish a connection between the display driver 03 and the multiple pixels 02 in the display area AA. In addition, multiple sensing lines SL are generally provided in each COF area.

[0068] In some embodiments, the display driver 03 can compensate the driving current output by the driving transistor T1 in each pixel 02 based on the sensed mobility K to improve the problem of poor display uniformity. Figure 3 It can be seen that when the mobility K is compensated, the sensing line SL is charged, that is, the equivalent capacitance on the sensing line SL is charged, so that the voltage on the sensing line SL increases.

[0069] However, combined with Figure 2 and Figure 4 It can be seen that a single COF area in the Fanout area generally presents a fan-shaped structure that is wide at the top and short at the bottom. Here, the top may refer to the side of the Fanout area close to the display area AA, and the bottom may refer to the side of the Fanout area away from the display area AA. Correspondingly, in the COF area, the line lengths of multiple sensing lines SL are usually long at the edges and short in the middle, that is, the lengths of the sensing lines SL located at the left and right edges of the COF area are greater than the lengths of the sensing lines SL located in the middle of the COF area. Among them, the line length may refer to the length of the sensing line SL, and the length direction may be parallel to the pixel column direction Y1. Since the longer the line length is, the greater the resistance value of its equivalent resistance is, it can be seen that in the COF area, there are resistance differences in the equivalent resistance values ​​of multiple sensing lines SL, and they are usually larger at the edges and smaller in the middle. Affected by the resistance difference, the voltage drop (IRDrop) on the multiple sensing lines SL in the COF area is inconsistent, which leads to poor compensation effect.

[0070] In the face of this technical problem, further combined Figure 5 ( Figure 4 A magnified view of the middle region of a single COF region is shown) and Figure 6 ( Figure 4 As can be seen from the enlarged view of the right edge area of ​​a single COF shown in the figure, in some embodiments, a winding design with matching resistance values ​​can be performed for the portions of the multiple sensing lines SL located in the COF area, so that in the COF area, the equivalent resistance values ​​of the multiple sensing lines SL are as similar as possible, thereby making the IR Drop on the multiple sensing lines SL in the COF area consistent, thereby solving the problem of poor compensation effect caused by resistance value differences.

[0071] For example, compared Figure 5 and Figure 6 It can be seen that because the length of the multiple sensing lines SL located in the middle of the COF area is short and the equivalent resistance is small, more winding designs can be performed on them to increase the equivalent resistance. Since the sensing lines SL closer to the edge of the COF area have longer lengths and larger equivalent resistances, the winding designs for them can also be shorter and shorter until no winding is required. At the same time, the line width of the sensing lines SL located at the edge of the COF area is wider than the line width of the sensing lines SL located in the middle of the COF area. In this way, the purpose of matching the equivalent resistance of each sensing line SL located in the COF area can be achieved, that is, the equivalent resistance of the parts of the multiple sensing lines SL located in the COF area can be made as similar as possible.

[0072] However, this will further lead to inconsistent equivalent capacitance values ​​of the multiple sensing lines SL located in the COF area. Affected by the winding design, the equivalent capacitance of the sensing line SL located in the middle of the COF area is smaller than the equivalent capacitance of the sensing line SL located at the edge of the COF area. According to the charging formula of the equivalent capacitance V = (I / C) * t (V refers to the charging voltage, I refers to the charging current, C refers to the equivalent capacitance, and t refers to the charging time), it can be seen that when the equivalent capacitance C itself is large, the slight difference in the equivalent capacitance C will have little effect on V; and when the equivalent capacitance C itself is small, the difference in the equivalent capacitance C will have a greater impact on V, making the difference in V also larger. It can be seen that when the sensing line SL is shorter, its equivalent capacitance C will also be smaller, which will have a greater impact on the compensation, resulting in the display module appearing like this. Figure 7 The obvious vertical stripes show poor display effects. It is understandable that, as mentioned above, the display module may include multiple COF areas. Figure 7 Each two adjacent vertical stripe-type bright lines shown may refer to bright lines formed at the edge of a single COF region.

[0073] In addition, it can be known that in some embodiments, the threshold voltage Vth of the driving transistor is also compensated. When compensating for the threshold voltage Vth, the charging time is generally longer, and when compensating for the mobility K, the charging time is generally shorter, and the charging is linear. On this basis, combined with the above charging formula, it can be known that the linear slope of charging is related to the equivalent capacitance C. The larger the equivalent capacitance C, the smaller the charging slope; conversely, the smaller the equivalent capacitance C, the larger the charging slope. It can be seen that when compensating for the mobility K, at the same charging time, different equivalent capacitances C will cause differences in the charging voltage V. And this difference is not caused by the difference in mobility K, but by the difference in equivalent capacitance C. As a result, incorrect compensation will be caused. To this end, the embodiment of the present application provides a compensation scheme, through which the poor compensation caused by the difference in equivalent capacitance C can be significantly improved:

[0074] The display driver 03 may determine a compensation value based on the sensed mobility and the compensation parameter, and compensate the driving current output by the driving transistor T1 in each pixel 02 based on the compensation value to achieve mobility compensation.

[0075] The compensation parameter is a parameter determined based on a geometric parameter of each sensing line SL among the plurality of sensing lines SL, and the geometric parameter includes: a line length related to an equivalent capacitance C of the sensing line SL.

[0076] That is, in the embodiment of the present application, when the display driver 03 compensates for the mobility K, it not only refers to the mobility K sensed by the sensing line SL, but also refers to the geometric parameters (such as line length) related to the equivalent capacitance C to determine the compensation value. Since the equivalent capacitance C is also taken into consideration, the poor compensation caused by the capacitance difference of the equivalent capacitance C can be improved.

[0077] Optionally, the compensation parameter can be predetermined by an external device (such as a computer) independent of the display module when designing the panel and then given to the display driver 03, so that the display driver 03 can reliably and quickly determine the compensation value directly based on the compensation parameter and the sensed mobility.

[0078] In summary, the embodiment of the present application provides a display module. Since the display driver in the display module can sense the mobility of the transistor in the pixel, and can compensate the driving current output by the driving transistor in the pixel based on the sensed mobility and compensation parameters, the driving current output by the driving transistor in different pixels can be made more uniform, and then the luminous brightness of the light-emitting elements in different pixels can be made more uniform, solving the problem of poor display effect of the display module caused by uneven mobility of transistors in different pixels due to process influence. That is, the display effect of the display module provided by the present application can be better.

[0079] In addition, since the display driver not only refers to the mobility sensed by the sensing line, but also refers to the compensation parameters determined based on the geometric parameters related to the equivalent capacitance of the sensing line when compensating the mobility, it can also improve the poor compensation caused by the capacitance difference of the equivalent capacitance. That is, it can further ensure that the compensation accuracy is better, thereby better improving the display effect of the display module.

[0080] Optionally, in one embodiment, the geometric parameters may further include: a line width related to an equivalent capacitance C of the sensing line SL. The line width may refer to the width of the sensing line SL, and the width direction may be parallel to the pixel row direction X1. And, on this basis, the compensation parameter may be an equivalent capacitance C of each sensing line SL determined based on the line length and line width simulation of each sensing line SL.

[0081] Optionally, when designing the panel, the external device described above can obtain the equivalent capacitance C of each sensing line SL through simulation based on the line length and line width of each sensing line SL. Figure 5 and Figure 6 The winding design when matching the resistors shown determines the line length and line width of each sensing line SL.

[0082] Based on this embodiment, the display driver can be used to: for each sensing line SL, apply the capacitance difference between the equivalent capacitance C of the sensing line SL and the equivalent capacitance C of other sensing lines SL, and the mobility K sensed by the sensing line SL to the mobility compensation algorithm to obtain a compensation value.

[0083] It can be understood that the difference in capacitance between each sensing line SL and other sensing lines SL can be determined based on the equivalent capacitance C of one of the sensing lines SL. Figure 5 It can be seen that the lengths of the sensing lines SL located in the middle of the COF region are generally the same, and accordingly, their equivalent capacitances C are also the same. Therefore, the capacitance difference between the equivalent capacitance C of each sensing line SL and the same equivalent capacitance C can be determined based on the same equivalent capacitance C.

[0084] It can also be understood that when the mobility K is compensated, the compensation value can generally be output by the compensation waveform in conjunction with the compensation algorithm to achieve compensation. Therefore, in the embodiment of the present application, the mobility K sensed by the sensing line SL and the determined capacitance difference can be added to the compensation algorithm to accurately output the compensation value according to the capacitance difference and the mobility K. In this way, the problem of poor compensation caused by the capacitance difference of the equivalent capacitance C can be solved, and the compensation accuracy can be improved.

[0085] It is understandable that the simulation time to determine the equivalent capacitance is long and the required software resources are huge, which makes it difficult to implement. Therefore, another embodiment is considered to improve the compensation accuracy:

[0086] Optionally, based on the above charging formula and the above records, it can be known that when the equivalent capacitance C is a large value, the capacitance difference has a smaller effect on the charging voltage V; and when the equivalent capacitance C is a small value, the capacitance difference has a greater effect on the charging voltage V. For example, after calculation, assuming that among the multiple sensing lines SL, the equivalent capacitance C of the portion of each sensing line SL located in the display area AA is 200 pF, and the capacitance difference of each sensing line SL located in the COF area is between 0 and 5 pF, the effect on the charging voltage V is less than 2.5%; assuming that among the multiple sensing lines SL, the equivalent capacitance C of the portion of each sensing line SL located in the display area AA is 80 pF, and the capacitance difference of each sensing line SL located in the COF area is between 0 and 5 pF, the effect on the charging voltage V is less than 6.25%.

[0087] Based on this principle, in another embodiment, the equivalent capacitance C of the portion of each sensing line SL in the display area AA among the multiple sensing lines SL can be set to be greater than the capacitance threshold, so that the influence of the capacitance difference of the equivalent capacitance C on each sensing line SL on the compensation is less than the influence threshold. That is, when designing the panel, the equivalent capacitance C of the portion of each sensing line SL in the display area AA can be increased to reduce the compensation difference of the K value of the TFT caused by the capacitance difference of the portion of each sensing line SL in the COF area.

[0088] Optionally, in some embodiments, the equivalent capacitance C can be increased by increasing the line length and line width of each sensing line SL located in the display area AA. It is understandable that since the lengths of the portions of the sensing lines SL located in the display area AA are generally the same, the equivalent capacitance C is also the same.

[0089] However, when performing some compensation (e.g., compensating for the threshold voltage Vth), the equivalent capacitance of the sensing line SL needs to be charged to saturation, so on the basis of increasing the equivalent capacitance C of the portion of each sensing line SL located in the display area AA, it takes a longer charging time. Therefore, another embodiment is considered to improve the compensation accuracy:

[0090] Optionally, in another embodiment, the compensation parameter may be a compensation gain value designed and determined based on the line length difference of each sensing line SL. Moreover, for each sensing line SL, the compensation gain value may be negatively correlated with the equivalent capacitance of the sensing line SL.

[0091] That is, for each sensing line SL, a compensation gain Gain value can be designed accordingly. Figure 8It can be seen from the curve graph that the longer the sensing line SL is, that is, the larger the equivalent capacitance is, the smaller the corresponding compensation gain Gain is; conversely, the shorter the sensing line SL is, that is, the smaller the equivalent capacitance is, the larger the corresponding compensation gain Gain is. It can be understood that Figure 8 The line length shown may refer to the line length of a plurality of sensing lines SL located in the COF region, and what is shown is a schematic diagram of the distribution of the line length from the edge to the middle of the fan-shaped COF region.

[0092] Optionally, when designing the panel, the compensation gain Gain value may be designed by the external device described above based on the line length difference of each sensing line SL. Figure 8 The display driver 03 may be stored in the form of a curve graph as shown, or may be based on Figure 8 The specific numerical value determined by the curve diagram shown is stored in the display driver 03. This embodiment of the present application does not limit this.

[0093] Based on this further embodiment, the display driver 03 can be used to: for each sensing line SL, apply the corresponding compensation gain Gain value to the mobility K sensed by the sensing line SL to obtain the target mobility, and determine the compensation value based on the target mobility. That is, the sensed mobility K can be output after passing through the compensation gain Gain value. Of course, in some embodiments, the compensation value for the mobility K determined based on the sensed mobility K can also be output after passing through the compensation gain Gain value.

[0094] For example, the display driver 03 may be configured to: for each sensing line SL, multiply the mobility K sensed by the sensing line SL by the corresponding compensation gain Gain value to obtain a target mobility.

[0095] Since the longer the length of the sensing line SL is, the larger the equivalent capacitance C of the sensing line SL is, the equivalent capacitance C of the sensing line SL can be reduced accordingly by designing a compensation gain Gain value that is negatively correlated with the length of the sensing line SL and multiplying the mobility K by the corresponding compensation gain Gain value, thereby offsetting the poor compensation problem caused by the difference in the equivalent capacitance C and improving the compensation accuracy.

[0096] It can be understood that, compared with the above-mentioned another embodiment, the above-mentioned one embodiment realizes compensation by directly referring to the capacitance difference, so the compensation accuracy is higher, and it belongs to fine compensation. Correspondingly, the above-mentioned compensation based on the compensation gain Gain value belongs to coarse compensation. Therefore, in another embodiment, the above-mentioned two embodiments can also be combined to perform double compensation of coarse compensation and fine compensation to better improve the compensation accuracy. For example, the compensation value can be determined by referring to the capacitance difference first, and then the determined compensation value can be multiplied by the compensation gain Gain value to obtain the final required compensation value to achieve compensation. In addition, while performing double compensation, it can also be combined with the above-mentioned another embodiment, by increasing the equivalent capacitance C of the part of each sensing line SL located in the display area AA, so as to reduce the compensation difference of the K value of the TFT caused by the capacitance difference of each sensing line SL located in the COF area. The compensation accuracy is better. That is, the above-mentioned embodiments can be combined with each other.

[0097] Optionally, the display driver 03 can also be used to: sense the threshold voltage Vth of the driving transistor T1 in each pixel 02 through a plurality of sensing lines SL, and determine the compensation value based on the sensed threshold voltage Vth, the sensed mobility K and the compensation parameter. That is, in the embodiment of the present application, the display driver 03 can also compensate for the threshold voltage Vth of the driving transistor T1, thereby further improving the display effect of the display module.

[0098] Furthermore, the display driver 03 may be used to: for each sensing line SL, determine a compensated threshold voltage value based on a threshold voltage Vth sensed by the sensing line SL, determine a compensated mobility value based on a mobility K sensed by the sensing line SL and a compensation parameter, and determine a compensation value based on the compensated threshold voltage value and the compensated mobility value. That is, when compensating the threshold voltage Vth, it is not necessary to refer to the compensation parameter described above.

[0099] Optionally, in an embodiment of the present application, the display driver 03 can be used to: sense a sensing voltage output by the driving transistor T1 in each pixel 02 through a plurality of sensing lines SL, and determine the mobility K and threshold voltage Vth of the driving transistor T1 in each pixel 02 based on the sensing voltage.

[0100] On this basis, continue to refer to the above Figure 2 It can be seen that the second electrode of the driving transistor T1 can be connected to the first electrode (e.g., anode) of the light emitting element L1, the first electrode of the driving transistor T1 can be connected to the pull-up power supply terminal ELVDD, and the second electrode of the light emitting element L1 can be connected to the pull-down power supply terminal ELVSS. In addition, the pixel 02 can also include: a sensing transistor T2.

[0101] The sensing transistor T2 can be connected to the second electrode of the driving transistor T1 and the sensing line SL respectively, and is also connected to the sensing scanning terminal G1, and is used to control the on and off of the second electrode of the driving transistor T1 and the sensing line SL in response to the sensing scanning signal provided by the sensing scanning terminal G1, so that the display driver 03 can sense the sensing voltage output by the driving transistor T1 in the pixel 02 through the sensing line SL.

[0102] For example, Figure 2 As shown, the gate of the sensing transistor T2 can be connected to the sensing scanning terminal G1, the first electrode of the sensing transistor T2 can be connected to the second electrode of the driving transistor T1, and the second electrode of the sensing transistor T2 can be connected to the sensing line SL. In addition, Figure 2 The parasitic capacitance Csense of the sense line SL is also schematically shown.

[0103] Furthermore, when the potential of the sensing scan signal provided by the sensing scan terminal G1 is a valid potential, the sensing transistor T2 can be turned on, so that the sensing line SL can transmit a sensing signal (e.g., a signal for resetting) to the second electrode of the driving transistor T1, and the sensing line SL can collect the sensing signal of the second electrode of the driving transistor T1, where the collected sensing signal can refer to the sensing voltage output by the driving transistor T1. When the potential of the sensing scan signal provided by the sensing scan terminal G1 is an invalid potential, the sensing transistor T2 can be turned off.

[0104] Optionally, for an N-type transistor, the effective potential may be a high potential relative to the invalid potential; for a P-type transistor, the effective potential may be a low potential relative to the invalid potential. Furthermore, the potential of the pull-up power signal provided by the pull-up power terminal ELVDD may be a high potential relative to the potential of the pull-down power signal provided by the pull-down power terminal ELVSS.

[0105] Optionally, in the embodiment of the present application, the display module may further include: a plurality of data lines Data, and the plurality of data lines Data may be located in the display area AA and the Fanout area.

[0106] For example, combined with Figure 2 , the display driver 03 may also be connected to the plurality of pixels 02 through the plurality of data lines Data, and may be used to provide a data signal to the driving transistor T1 in each pixel 02 through the plurality of data lines Data based on the compensation value determined above, so as to compensate the driving current output by the driving transistor T1 in each pixel 02. That is, in the embodiment of the present application, as described above, the mobility compensation and the threshold voltage compensation may be realized by compensating the data signal.

[0107] Optionally, together with the plurality of sensing lines SL, the display module may also include a plurality of data lines Data ( Figure 1 (not shown). That is, the display driver 03 can be connected to a column of pixels 02 through each data line Data, and can be connected to different columns of pixels through different data lines Data. Of course, it is not limited to the one-to-one correspondence connection here.

[0108] On this basis, continue to refer to the above Figure 2 It can be seen that the pixel 02 may further include: a data writing transistor T3.

[0109] The data writing transistor T3 can be connected to the gate of the driving transistor T1 and the data line Data respectively, and can also be connected to the display scanning terminal G2, and can be used to control the on and off of the gate of the driving transistor T1 and the data line Data in response to the display scanning signal provided by the display scanning terminal G2, so that the display driver 03 can provide the data signal to the driving transistor T1 in the pixel 02 through the data line Data.

[0110] For example, Figure 2 As shown, the gate of the data writing transistor T3 can be connected to the display scanning terminal G2, the first electrode of the data writing transistor T3 can be connected to the data line Data, and the second electrode of the data writing transistor T3 can be connected to the gate of the driving transistor T1.

[0111] Furthermore, when the potential of the display scanning signal provided by the display scanning terminal G2 is a valid potential, the data writing transistor T3 can be turned on, so that the data line Data can transmit the data signal to the gate of the driving transistor T1. When the potential of the display scanning signal provided by the display scanning terminal G2 is an invalid potential, the data writing transistor T3 can be turned off.

[0112] Optionally, in some embodiments, continue to refer to Figure 2 It can be seen that pixel 02 may also include a storage capacitor Cst connected between the gate and the second electrode of the driving transistor T1. The storage capacitor Cst may be used to adjust the potential between the gate and the second electrode of the driving transistor T1 to ensure that the potential is relatively stable, thereby ensuring that the driving transistor T1 can reliably output a driving current to the light-emitting element L1 to drive the light-emitting element L1 to reliably emit light.

[0113] That is, for Figure 2 For example, the pixel shown may include a pixel circuit of a 3T1C (ie, 3 transistors and 1 capacitor) structure. In addition, Figure 2In the pixel 02 shown, each transistor may be an N-type transistor, and accordingly, the effective potential may be a high potential, and the invalid potential may be a low potential. Of course, in some other embodiments, the pixel 02 may also include a pixel circuit of other structures. For example, a 6T1C pixel circuit may be included. In addition, a P-type transistor may also be included in the pixel circuit.

[0114] Alternatively, if Fig. 9 As shown, the display driver 03 described in the embodiment of the present application may include: a sensing compensation unit 031 and a driving control unit 032 .

[0115] The sensing compensation part 031 may be connected to the plurality of pixels 02 through the plurality of sensing lines SL, and the sensing compensation part 031 may also be connected to the driving control part 032 .

[0116] The sensing compensation part 031 may be used to sense the mobility K of the driving transistor T1 in each pixel 02 through the plurality of sensing lines SL.

[0117] The driving control unit 032 may be configured to determine a compensation value based on the mobility K sensed through the plurality of sensing lines SL and the compensation parameter.

[0118] The sensing compensation unit 031 may also be used to compensate the driving current output by the driving transistor T1 in each pixel 02 based on the compensation value.

[0119] Of course, in the scenario where the display driver 03 also compensates for the threshold voltage Vth, the sensing compensation unit 031 can also be used to sense the threshold voltage Vth of the driving transistor T1 in each pixel 02 through multiple sensing lines SL, so that the driving control unit 032 also determines the compensation value based on the threshold voltage Vth.

[0120] That is, in the embodiment of the present application, the sensing compensation unit 031 can sense the sensing voltage output by the driving transistor T1 to determine performance parameters such as mobility K and threshold voltage Vth, and the driving control unit 032 can determine the compensation value based on the sensing result to instruct the sensing compensation unit 031 to adjust the data signal to achieve compensation for the driving current output by the driving transistor T1 in each pixel 02.

[0121] Optionally, the sensing compensation unit 031 may include: a source driver (source IC). The driving control unit 032 may include: a timing controller (timing controller, TCON).

[0122] In summary, the embodiment of the present application provides a display module. Since the display driver in the display module can sense the mobility of the transistor in the pixel, and can compensate the driving current output by the driving transistor in the pixel based on the sensed mobility and compensation parameters, the driving current output by the driving transistor in different pixels can be made more uniform, and then the luminous brightness of the light-emitting elements in different pixels can be made more uniform, solving the problem of poor display effect of the display module caused by uneven mobility of transistors in different pixels due to process influence. That is, the display effect of the display module provided by the present application can be better.

[0123] In addition, since the display driver not only refers to the mobility sensed by the sensing line, but also refers to the compensation parameters determined based on the geometric parameters related to the equivalent capacitance of the sensing line when compensating the mobility, it can also improve the poor compensation caused by the capacitance difference of the equivalent capacitance. That is, it can further ensure that the compensation accuracy is better, thereby better improving the display effect of the display module.

[0124] The present application also provides a compensation method for a display module, which is applied to the display module as described above. Fig.10 As shown, the method includes:

[0125] Step 1001 : sensing the mobility of the driving transistor in each pixel through a plurality of sensing lines.

[0126] Step 1002: Determine a compensation value based on the sensed mobility and compensation parameters.

[0127] Step 1003 : Compensate the driving current output by the driving transistor in each pixel based on the compensation value to achieve mobility compensation.

[0128] The compensation parameter is a parameter determined based on the geometric parameters of each of the plurality of sensing lines, and the geometric parameters include: a line length related to the equivalent capacitance of the sensing line. It can be understood that, in combination with the foregoing description, the compensation method can be executed by a display driver in a display module.

[0129] Optionally, in combination with the above description, in one embodiment, the geometric parameters may further include: a line width related to the equivalent capacitance of the sensing line; the compensation parameter may be the equivalent capacitance of each sensing line determined based on the line length and line width simulation of each sensing line. Accordingly, the above step 1002 may include: for each sensing line, applying the capacitance difference between the equivalent capacitance of the sensing line and the equivalent capacitance of other sensing lines, and the mobility sensed by the sensing line to the mobility compensation algorithm to obtain a compensation value.

[0130] For example, taking this embodiment as an example, Fig.11A schematic diagram of a compensation method is shown schematically. Fig.11 It can be seen that in this embodiment, first, the equivalent capacitance C of each (also referred to as each) sensing line Sense line can be simulated, and this step can be determined by the external device described above. Then, after the compensation starts, the threshold voltage Vth of the transistor TFT (here it can refer to the driving transistor) can be sensed and compensated first, that is, the step of performing the Vth Sense of the TFT can be performed. Then, the C of each sensing line Sense line and the sensed mobility K can be added to the compensation algorithm to perform the sensing compensation of the mobility of the TFT, that is, the step of performing the K Sense of the TFT after adding the C of each Sense line. Finally, the compensation value can be output based on the compensation of the threshold voltage Vth and the mobility K to adjust the data signal provided by the data line Data, thereby realizing compensation for the driving current output by the driving transistor.

[0131] Optionally, in combination with the foregoing description, in another embodiment, the compensation parameter may be a compensation gain value designed and determined based on the difference in line lengths of each sensing line, and, for each sensing line, the line length of the sensing line is negatively correlated with the compensation gain value. Accordingly, the above step 1002 may include: for each sensing line, applying the corresponding compensation gain value to the mobility sensed by the sensing line to obtain a target mobility, and determining the compensation value based on the target mobility. For example, for each sensing line, the display driver may multiply the mobility sensed by the sensing line by the corresponding compensation gain value to obtain the target mobility.

[0132] For example, taking this another embodiment as an example, Fig.12 A schematic diagram of a compensation method is shown schematically. Fig.12 It can be seen that in this embodiment, after the compensation starts, the threshold voltage Vth of the transistor TFT (here it can refer to the driving transistor) can be sensed and compensated first, that is, the step of performing Vth Sense of TFT can be performed. Then, the mobility K of the transistor TFT can be sensed and compensated, that is, the step of performing K Sense of TFT can be performed. Then, the value of the compensation for the mobility K can be * the designed compensation gain Gain value, that is, the step of adding K*Gain can be performed. Finally, the compensation value can be output based on the compensation for the threshold voltage Vth and the mobility K to adjust the data signal provided by the data line Data, thereby realizing compensation for the driving current output by the driving transistor.

[0133] Optionally, in some embodiments, the compensation method may further include: sensing a threshold voltage of a driving transistor in each pixel through a plurality of sensing lines, and determining a compensation value based on the sensed threshold voltage, the sensed mobility and the compensation parameter.

[0134] For example, for each sensing line, the display driver may determine a compensated threshold voltage value based on a threshold voltage sensed by the sensing line, determine a compensated mobility value based on the mobility sensed by the sensing line and a compensation parameter, and determine a compensation value based on the compensated threshold voltage value and the compensated mobility value.

[0135] Optionally, in some embodiments, the above step 1001 and the above sensing threshold voltage may include: sensing a sensing voltage output by a driving transistor in each pixel through a plurality of sensing lines, and determining a mobility and a threshold voltage of the driving transistor in each pixel based on the sensing voltage.

[0136] Optionally, in some embodiments, the step 1003 may include: providing a data signal to a driving transistor in each pixel through a plurality of data lines based on the compensation value, so as to compensate for a driving current output by the driving transistor in each pixel.

[0137] It is understandable that, since the compensation method of the display module has substantially the same technical effect as the aforementioned display module, the technical effect of the compensation method will not be repeatedly described herein for the purpose of brevity.

[0138] The present application also provides a display device. Fig.13 As shown, the display device includes: a power supply component 10, and a display module 00 as described above.

[0139] The power supply component 10 is connected to the display module 00 and is used to supply power to the display module 00 .

[0140] Optionally, the display device may be an OLED display device, an AMOLED display device, etc. Furthermore, the display device may also be any product or component having a display function, such as a mobile phone, a tablet computer, a flexible display device, a television, and a monitor.

[0141] It is understandable that, since the display device has substantially the same technical effects as the aforementioned display module, the technical effects of the display device will not be described repeatedly here for the purpose of brevity.

[0142] It should be understood that the terms used in the embodiments of the present application are used to explain the embodiments of the present application, and are not intended to limit the present application. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the common meanings understood by people with ordinary skills in the field to which the present application belongs.

[0143] For example, in the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The term "plurality" refers to two or more, unless otherwise clearly defined.

[0144] Likewise, the words “a” or “an” and the like do not denote a limitation of quantity, but rather denote the presence of at least one.

[0145] Words such as “include” or “comprising” and the like mean that the elements or objects preceding “include” or “comprising” include the elements or objects listed after “include” or “comprising” and their equivalents, and do not exclude other elements or objects.

[0146] “Up”, “down”, “left” or “right” etc. are only used to indicate relative position relationship. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0147] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A display module, characterized in that: The display module comprises: A display substrate, including adjacent display areas and fan-out areas; A plurality of pixels are located in the display area, the pixels comprising a driving transistor and a light-emitting element, the driving transistor is connected to the light-emitting element and is used to output a driving current to the light-emitting element to drive the light-emitting element to emit light; A plurality of sensing lines are located in the display area and the fan-out area; a display driver connected to the plurality of pixels through the plurality of sensing lines and configured to sense the mobility of a driving transistor in each of the pixels through the plurality of sensing lines, determine a compensation value based on the sensed mobility and a compensation parameter, and compensate a driving current output by the driving transistor in each of the pixels based on the compensation value to achieve mobility compensation; The compensation parameter is a parameter determined based on a geometric parameter of each sensing line among the plurality of sensing lines, and the geometric parameter includes: a line length related to an equivalent capacitance of the sensing line.

2. The display module according to claim 1, characterized in that: The compensation parameter is a compensation gain value designed and determined based on the difference in line lengths of the sensing lines, and for each of the sensing lines, the compensation gain value is negatively correlated with an equivalent capacitance value of the sensing line; The display driver is used for: for each of the sensing lines, applying a corresponding compensation gain value to the mobility sensed by the sensing line to obtain a target mobility, and determining the compensation value based on the target mobility.

3. The display module according to claim 2, characterized in that: The display driver is used for: for each of the sensing lines, multiplying the mobility sensed by the sensing line by a corresponding compensation gain value to obtain the target mobility.

4. The display module according to claim 1, characterized in that: The geometric parameters further include: a line width related to an equivalent capacitance of the sensing line; the compensation parameter is an equivalent capacitance of each sensing line determined based on a simulation of the line length and line width of each sensing line; The display driver is used for: for each of the sensing lines, applying the capacitance difference between the equivalent capacitance of the sensing line and the equivalent capacitance of other sensing lines, and the mobility sensed by the sensing line to a mobility compensation algorithm to obtain the compensation value.

5. The display module according to any one of claims 1 to 4, characterized in that: The display driver is further configured to sense a threshold voltage of a driving transistor in each of the pixels through the plurality of sensing lines, and determine the compensation value based on the sensed threshold voltage, the sensed mobility and the compensation parameter.

6. The display module according to claim 5, characterized in that: The display driver is used to: for each of the sensing lines, determine a compensated threshold voltage value based on a threshold voltage sensed by the sensing line, determine a compensated mobility value based on a mobility sensed by the sensing line and the compensation parameter, and determine the compensation value based on the compensated threshold voltage value and the compensated mobility value.

7. The display module according to claim 5, characterized in that: The display driver is configured to sense a sensing voltage output by a driving transistor in each of the pixels through the plurality of sensing lines, and determine a mobility and a threshold voltage of the driving transistor in each of the pixels based on the sensing voltage.

8. The display module according to claim 7, characterized in that: The second electrode of the driving transistor is connected to the first electrode of the light emitting element, the first electrode of the driving transistor is connected to the pull-up power supply terminal, and the second electrode of the light emitting element is connected to the pull-down power supply terminal; the pixel further includes: a sensing transistor; The sensing transistor is respectively connected to the second electrode of the driving transistor and the sensing line, and is also connected to a sensing scanning end, and is used to control the on-off of the second electrode of the driving transistor and the sensing line in response to a sensing scanning signal provided by the sensing scanning end, so that the display driver can sense the sensing voltage output by the driving transistor in the pixel through the sensing line.

9. The display module according to any one of claims 1 to 4, characterized in that: The display module also includes: A plurality of data lines are located in the display area and the fan-out area; The display driver is also connected to the plurality of pixels through the plurality of data lines, and is used to provide a data signal to the driving transistor in each of the pixels through the plurality of data lines based on the compensation value, so as to compensate the driving current output by the driving transistor in each of the pixels.

10. The display module according to claim 9, characterized in that: The pixel further includes: a data writing transistor; The data writing transistor is respectively connected to the gate of the driving transistor and the data line, and is also connected to the display scanning end, and is used to control the on and off of the gate of the driving transistor and the data line in response to the display scanning signal provided by the display scanning end, so that the display driver can provide the data signal to the driving transistor in the pixel through the data line.

11. The display module according to any one of claims 1 to 4, characterized in that: The display driver comprises: a sensing compensation part and a driving control part; The sensing compensation part is connected to the plurality of pixels through the plurality of sensing lines, and the sensing compensation part is also connected to the driving control part; The sensing compensation part is used to: sense the mobility of the driving transistor in each of the pixels through the plurality of sensing lines; The drive control unit is used to: determine a compensation value based on the mobility sensed by the plurality of sensing lines and the compensation parameter; The sensing compensation unit is further configured to compensate a driving current output by a driving transistor in each of the pixels based on the compensation value.

12. The display module according to claim 11, characterized in that: The sensing compensation part includes: a source driver; the driving control part includes: a timing controller.

13. The display module according to any one of claims 1 to 4, characterized in that: The equivalent capacitance of a portion of each sensing line in the display area is greater than a capacitance threshold, so that the influence of the capacitance difference of the equivalent capacitances on the sensing lines on compensation is less than the influence threshold.

14. A compensation method for a display module, characterized in that: Applied to the display module according to any one of claims 1 to 13, the method comprises: sensing the mobility of the driving transistor in each pixel through a plurality of sensing lines; determining a compensation value based on the sensed mobility and a compensation parameter; Compensating a driving current output by a driving transistor in each of the pixels based on the compensation value to achieve mobility compensation; The compensation parameter is a parameter determined based on a geometric parameter of each sensing line among the plurality of sensing lines, and the geometric parameter includes: a line length related to an equivalent capacitance of the sensing line.

15. A display device, characterized in that: The display device comprises: a power supply component, and a display module according to any one of claims 1 to 13; The power supply component is connected to the display module and is used to supply power to the display module.

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