Display module, driving method thereof and display device

Abstract

The invention discloses a display module, a driving method thereof and a display device, the display module comprises a driving chip, a plurality of first signal lines and a plurality of sub-pixels, the first signal lines are electrically connected with the driving chip, and the plurality of first signal lines are mutually insulated; the sub-pixel comprises a pixel circuit and a light-emitting element, the pixel circuit comprises a first switch unit, the first end of the first switch unit is electrically connected with the first end of the light-emitting element, and the second end of the first switch unit is electrically connected with the first signal line; the working process of at least part of the pixel circuits comprises a display driving stage and a detection stage; in a display driving stage, the driving chip is used for resetting the first end of the light-emitting element through the first signal line and the first switch unit; in the detection stage, the driving chip is used for detecting a voltage signal of the first end of the light-emitting element through the first signal line and the first switch unit. According to the technical scheme, the temperature of the light-emitting element can be accurately detected, the structure is simple, and the cost is low.

Description

Technical Field

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

[0002] In an LED display panel, the device characteristics of its light-emitting elements are greatly affected by temperature changes. Especially when the display panel displays images for a long time, the light-emitting elements emit a lot of heat, resulting in high temperatures, and their device characteristics will shift significantly, which will cause deviations in the brightness or color performance of the display panel.

[0003] In this regard, in the related art, it is necessary to detect the temperature of the light-emitting element, and then perform corresponding brightness compensation on the display panel according to the temperature change of the light-emitting element. However, the current detection methods, such as setting a detection circuit module or setting a temperature detection metal wiring, often have problems such as complex structure, high cost and / or poor detection accuracy. Summary of the invention

[0004] The present invention provides a display module and a driving method thereof, and a display device, which can realize accurate detection of the temperature of a light-emitting element and provide accurate data support for brightness compensation, while simplifying the structural design required for temperature detection and reducing costs.

[0005] According to one aspect of the present invention, there is provided a display module, comprising:

[0006] Driver chip;

[0007] A plurality of first signal lines, the first signal lines are electrically connected to the driving chip, and the plurality of first signal lines are insulated from each other;

[0008] A plurality of sub-pixels, each of which includes a pixel circuit and a light-emitting element, wherein the pixel circuit includes a first switch unit, wherein a first end of the first switch unit is electrically connected to a first end of the light-emitting element, and a second end of the first switch unit is electrically connected to a first signal line;

[0009] The working process of at least part of the pixel circuit includes a display driving stage and a detection stage; in the display driving stage, the driver chip is used to reset the first end of the light-emitting element through the first signal line and the first switch unit; in the detection stage, the driver chip is used to detect the voltage signal of the first end of the light-emitting element through the first signal line and the first switch unit.

[0010] According to another aspect of the present invention, a method for driving a display module is provided, which is applied to the display module provided by any embodiment of the present invention, wherein the plurality of sub-pixels of the display module include at least one target sub-pixel, the light-emitting element of the target sub-pixel is the target light-emitting element, the pixel circuit of the target sub-pixel is the target pixel circuit, and the working process of the target pixel circuit includes a detection stage and a display driving stage, and the driving method includes:

[0011] In the detection stage, the driver chip controls the first switch unit to be turned on, and detects the voltage signal of the first end of the target light-emitting element through the first signal line, determines the current temperature of the target light-emitting element according to the voltage signal, and compensates the data voltage of the target sub-pixel according to the current temperature;

[0012] In the display driving stage, the driving chip controls the first switch unit to be turned on, and writes a reset signal into the first end of the target light emitting element through the first signal line to reset the first end of the target light emitting element.

[0013] According to another aspect of the present invention, a display device is provided, comprising the display module provided by any embodiment of the present invention.

[0014] The technical solution of the embodiment of the present invention is to set the working process of at least part of the pixel circuit to include a display driving stage and a detection stage. By multiplexing the first signal line and the first switch unit in the pixel circuit, the driver chip resets the first end of the light-emitting element through the first signal line and the first switch unit in the display driving stage of the pixel circuit, and the driver chip detects the voltage signal of the first end of the light-emitting element through the first signal line and the first switch unit in the detection stage of the pixel circuit. In this way, the temperature of the light-emitting element can be accurately detected without adding other circuit devices and wirings in the display panel, and the structure is simple and the cost is low. In addition, since no other structures are added in the display panel, this solution will not restrict the improvement of the pixel density of the display panel, and for a transparent display panel, it will not affect the transmittance of the display panel.

[0015] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 is a structural schematic diagram of a display module provided by an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Schematic diagram of the specific structure of the middle area Q;

[0019] Figure 3 is with Figure 2 A corresponding driving timing diagram of a pixel circuit;

[0020] Figure 4 is with Figure 2 A corresponding driving timing diagram of another pixel circuit;

[0021] Figure 5 is with Figure 2 A corresponding driving timing diagram of another pixel circuit;

[0022] Figure 6 is with Figure 2 A corresponding driving timing diagram of another pixel circuit;

[0023] Figure 7 is with Figure 2 A corresponding driving timing diagram of another pixel circuit;

[0024] Figure 8 is with Figure 2 A corresponding driving timing diagram of another pixel circuit;

[0025] Fig. 9 is a flow chart of a method for driving a display module provided by an embodiment of the present invention;

[0026] Fig.10 It is a structural schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0028] It is obvious to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit or scope of the present application. Therefore, the present application is intended to cover modifications and changes of the present application that fall within the scope of the corresponding claims (technical solutions for protection) and their equivalents. It should be noted that the implementation methods provided in the embodiments of the present application can be combined with each other without contradiction.

[0029] First of all, it should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Including" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left" and "right" and similar words are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. In addition, the shapes and sizes of the components in the accompanying drawings do not reflect the true proportions, and the purpose is only to illustrate the content of the present invention.

[0030] Figure 1 is a structural schematic diagram of a display module provided by an embodiment of the present invention, Figure 2 yes Figure 1 The specific structural diagram of the middle area Q is as follows: Figure 1 and Figure 2 As shown, the display module 100 provided by the embodiment of the present invention includes a driving chip 10, a plurality of sub-pixels 20 and a plurality of first signal lines 30; the first signal line 30 is electrically connected to the driving chip 10, and the plurality of first signal lines 10 are insulated from each other; the sub-pixel 20 includes a pixel circuit 21 and a light-emitting element 22, the pixel circuit 21 includes a first switch unit 211, a first end of the first switch unit 211 is electrically connected to a first end of the light-emitting element 22, and a second end of the first switch unit 211 is electrically connected to the first signal line 30; the working process of at least part of the pixel circuit includes a display driving stage and a detection stage; in the display driving stage, the driving chip 10 is used to reset the first end of the light-emitting element 22 through the first signal line 30 and the first switch unit 211; in the detection stage, the driving chip 10 is used to detect the voltage signal of the first end of the light-emitting element 22 through the first signal line 30 and the first switch unit 211.

[0031] like Figure 2As shown, the optional light emitting element 22 is a light emitting diode, and the first end of the light emitting element 22 specifically refers to the anode of the light emitting diode.

[0032] The inventor discovered during the research that when a light-emitting diode emits light under the action of a driving current, its forward voltage drop, that is, the voltage difference between the anode and the cathode, will change with the change of temperature. Specifically, as the temperature rises, the forward voltage drop of the light-emitting diode shows a downward trend. Since the second end (cathode) of the light-emitting element 22 receives the same negative power supply voltage, the current forward voltage drop of the light-emitting element can be determined by collecting the voltage of the first end (anode) of the light-emitting element, and then the current temperature of the light-emitting element can be determined according to the mapping relationship between temperature and forward voltage drop. Subsequently, the brightness of the corresponding sub-pixel can be compensated according to the current temperature of the light-emitting element, and the brightness of the sub-pixel can be adjusted to the standard brightness.

[0033] Furthermore, the embodiment of the present invention collects the voltage signal of the first end of the light emitting element by multiplexing the first signal line 30 and the first switch unit 211 used for resetting the first end of the light emitting element 22 in the display driving stage, and using the first signal line 30 and the first switch unit to detect the voltage signal of the first end of the light emitting element 22 in the detection stage. With such a configuration, the voltage of the first end of the light emitting element can be detected by using the original circuit structure (i.e., the first switch unit) and the original signal line (i.e., the first signal line) in the display panel, and the temperature detection can be realized by using a driving chip with a temperature data processing function, so that the detection accuracy can be ensured without adding other circuit components and wiring in the display panel, and the structure is simple and the cost is low; in addition, since no other structures are added in the display panel, the present solution will not restrict the improvement of the pixel density of the display panel, and for a transparent display panel, the light transmittance of the display panel will not be affected.

[0034] Among them, the display driving stage is the stage in which the pixel circuit drives the light-emitting element to emit light to realize the display function. It can be understood that each pixel circuit drives the corresponding light-emitting element to emit light in its display driving stage, so as to realize the display of a frame of picture. In the display driving stage, the driver chip resets the first end of the light-emitting element through the first signal line and the first switch unit, which can avoid the presence of residual charge of the previous frame of picture on the first end of the light-emitting element, thereby ensuring the display effect. The specific process of the pixel circuit in the display driving stage will be described in detail later, and will not be elaborated on here.

[0035] Among them, the detection stage is the stage of detecting the voltage at the first end of the light-emitting element to realize temperature detection. The working process of at least part of the pixel circuits mentioned above includes a display drive stage and a detection stage. Specifically, it can be understood that for multiple light-emitting elements in the display module, only the voltage at the first end of some of the light-emitting elements can be detected. At this time, it is only necessary that the working process of the pixel circuits corresponding to these light-emitting elements includes both the display drive stage and the detection stage, and the pixel circuits corresponding to the remaining light-emitting elements only include the display drive stage, that is, the working process of some pixel circuits includes the display drive stage and the detection stage; or, the voltage at the first end of all light-emitting elements can be detected. At this time, all pixel circuits include the display drive stage and the detection stage.

[0036] In summary, in the display module provided by the embodiment of the present invention, the working process of at least part of the pixel circuit includes a display driving stage and a detection stage. By reusing the first signal line and the first switch unit in the pixel circuit, the driving chip resets the first end of the light-emitting element through the first signal line and the first switch unit in the display driving stage of the pixel circuit, and the driving chip detects the voltage signal of the first end of the light-emitting element through the first signal line and the first switch unit in the detection stage of the pixel circuit. In this way, the temperature of the light-emitting element can be accurately detected without adding other circuit devices and wirings in the display panel, and the structure is simple and the cost is low. In addition, since no other structures are added in the display panel, this solution will not restrict the improvement of the pixel density of the display panel, and will not affect the transmittance of the display panel for a transparent display panel.

[0037] Based on the above embodiments, the structure and operation process of the pixel circuit are described in detail below.

[0038] like Figure 2 As shown, optionally, the pixel circuit 21 further includes a second switch unit 212 and a driving transistor M0, a first end of the second switch unit 212 is electrically connected to the gate of the driving transistor M0, and a second end of the second switch unit 212 is electrically connected to the first signal line 30; a control end of the first switch unit 211 is electrically connected to the first scan signal end Scan1, and a control end of the second switch unit 212 is electrically connected to the second scan signal end Scan2. Optionally, the first switch unit 211 includes a first transistor M1, and the second switch unit 212 includes a second transistor M2.

[0039] In addition, if Figure 2As shown, optionally, the pixel circuit 21 further includes a light emitting control unit 213, the light emitting control unit 213 is electrically connected to the first end of the light emitting element 22, and the control end of the light emitting control unit 213 is electrically connected to the light emitting control signal end Emit. Optionally, the light emitting control unit 213 includes a third transistor M3 and a fourth transistor M4, the gates of the third transistor M3 and the fourth transistor M4 are both electrically connected to the light emitting control signal end Emit, the third transistor M3 is connected between the first end of the driving transistor M0 and the first power signal end PVDD, the fourth transistor M4 is connected between the second end of the driving transistor M0 and the light emitting element 22, the second end of the light emitting element 22 is electrically connected to the second power signal end PVEE, and the voltage of the first power signal end PVDD is greater than the voltage of the second power signal end PVEE.

[0040] In addition, if Figure 2 As shown, optionally, the pixel circuit 21 also includes a fifth transistor M5 and a sixth transistor M6, the gate of the fifth transistor M5 and the gate of the sixth transistor M6 are both electrically connected to the first scan signal terminal Scan1, the first end of the fifth transistor M5 is electrically connected to the data signal terminal Vdata, the second end of the fifth transistor M5 is electrically connected to the first end of the driving transistor M0, the first end of the sixth transistor M6 is electrically connected to the second end of the driving transistor M0, and the second end of the sixth transistor M6 is electrically connected to the gate of the driving transistor M0.

[0041] It should be noted that the first terminal and the second terminal of the above transistors (such as M0 to M6) refer to the source and drain of the transistors, respectively. Exemplarily, the first terminal of the transistor is the source and the second terminal is the drain, or the first terminal of the transistor is the drain and the second terminal is the source. It should also be noted that each transistor can be a P-type transistor or an N-type transistor. Figure 2 The example in which all transistors are P-type is used for illustration only. In other embodiments, some transistors may be N-type and some transistors may be P-type.

[0042] In addition, if Figure 2 As shown, optionally, the pixel circuit 21 further includes a storage capacitor Cst, a first end of the storage capacitor Cst is electrically connected to the first power signal terminal PVDD, and a second end of the storage capacitor Cst is electrically connected to the gate of the driving transistor M0.

[0043] For example, Figure 3 is with Figure 2 A corresponding driving timing diagram of a pixel circuit, combined with Figure 1-Figure 3As shown, the display driving stage T1 of the pixel circuit includes an initialization stage t1, a data writing stage t2 and a light emitting stage t3. Specifically, in the initialization stage t1, the driving chip applies an initialization signal Vref to the first signal terminal X, the second transistor M2 is turned on under the control of the second scanning control signal sent by the second scanning control signal terminal Scan2, and the initialization signal Vref is written into the gate of the driving transistor T1 to initialize the gate of the driving crystal transistor M0. In the data writing stage t2, the fifth transistor M5 is turned on under the control of the first scanning control signal sent by the first scanning control signal terminal Scan1, the sixth transistor M6 is turned on under the control of the first scanning control signal sent by the first scanning control signal terminal Scan1, and the driving transistor M0 is turned on because the gate-source voltage meets the turn-on condition, so that the fifth transistor M5 writes the data signal of the data signal terminal Vdata into the gate of the driving transistor M0, and at the same time, the sixth transistor M6 compensates the threshold voltage of the driving transistor M0 to the gate of the driving transistor M0. In addition, in the data writing phase t2, the driver chip applies a reset signal to the first signal terminal X (the reset signal may be the same as the above-mentioned initialization signal Vref), and the first transistor M1 is turned on under the control of the first scanning control signal sent by the first scanning control signal terminal Scan1, and the reset signal is written to the first end (anode) of the light emitting element 22, so as to reset the first end of the light emitting element 22. In the light emitting phase t3, the third transistor M3 and the fourth transistor M4 are turned on under the control of the light emitting control signal of the light emitting control signal terminal Emit, and since the storage capacitor Cst stores the gate potential of the driving transistor M0, the driving transistor M0 generates a driving current based on the gate potential and the potential of the first power signal terminal PVDD, so as to drive the light emitting element 22 to emit light.

[0044] In addition, combined Figure 2 and Figure 3 As shown, optionally, the working process of the pixel circuit also includes a detection stage T0. In the detection stage T0, the first scanning signal of the first scanning signal terminal Scan1 includes an enabling stage (such as from moment b to moment c). In the enabling stage, the first switch unit 211 is turned on; in the detection stage T0, the driving chip is used to input an excitation signal Sts to the light-emitting element 22 through the first signal line 30, so as to detect the voltage signal Vts at the first end of the light-emitting element 22 when the first switch unit 211 is turned on, and determine the temperature of the light-emitting element 22 according to the voltage signal Vts.

[0045] The enabling phase of the first scanning signal is the phase in which the first scanning signal turns on the first switch unit. Figure 2 In the embodiment, the first switch unit 211 is composed of a first transistor M1. When the first scan signal is at a low level, the first transistor M1 is turned on. At this time, the time period when the first scan signal is at a low level is the enabling stage of the first scan signal.

[0046] The excitation signal Sts is used to supply power to the light emitting element 22 to drive it to emit light. Figure 2 and Figure 3 In the detection phase T0, the driver chip applies an excitation signal Sts to the first signal terminal X. When the first switch unit 211 is turned on, the excitation signal can be input to the light-emitting element 22 through the first signal line 30 and the first switch unit 211 to drive the light-emitting element 22 to emit light. At the same time, the driver chip can detect the voltage signal Vts at the first end of the light-emitting element 22 through the first signal line 30 when the first switch unit 211 is turned on, and determine the temperature of the light-emitting element according to the voltage signal Vts. Specifically, during the light-emitting period of the light-emitting element, if the temperature changes, the voltage at the first end of the light-emitting element 22 will change slightly, so that the voltage on the first signal line 30 will change slightly. While providing the excitation signal Sts to drive the light-emitting element to emit light, the driver chip can detect the voltage on the first signal line 30 through the internal detection unit to determine the voltage change, so as to determine the voltage change at the first end of the light-emitting element 22, that is, to determine the forward voltage drop, and then determine the current temperature of the light-emitting element according to the mapping relationship between the temperature and the forward voltage drop.

[0047] It should be noted that Figure 3 The waveform of the voltage signal Vts shown is for illustration only, and is only for illustrating that the detected voltage signal Vts is almost synchronized with the excitation signal Sts, and does not constitute a limitation on the actual waveform.

[0048] Reference Figure 2 Optionally, the width-to-length ratio of the first transistor M1 is smaller than the width-to-length ratio of the driving transistor M0. This arrangement can reduce the leakage current of the first transistor, ensure that the signal is not distorted, and improve the accuracy of the detection result.

[0049] Furthermore, combined with Figure 2 and Figure 3 As shown, optionally, in the detection stage T0, the first scan signal of the first scan signal terminal Scan1 is used to control the first switch unit 211 to be turned on, and the second scan signal of the second scan signal terminal Scan2 is used to control the second switch unit 212 to be turned off. Figure 2 and Figure 3In the detection stage T0, the first scanning signal of the first scanning signal terminal Scan1 is at a low level, so that the first transistor M1 is turned on, and the second scanning signal of the second scanning signal terminal Scan2 is at a high level, so that the second transistor M1 is turned off. In this way, it can be ensured that the path between the first signal line 30 and the first switch unit 211 is turned on, while the path between the first signal line 30 and the second switch unit 212 is turned off, ensuring that in the detection stage, except for the reused first switch unit, the remaining components in the pixel circuit do not work, avoiding affecting the detection result.

[0050] In addition, combined Figure 2 and Figure 3 As shown, optionally, in the detection phase T0, the light control signal of the light control signal terminal Emit is used to control the light control unit 213 to turn off. Figure 2 and Figure 3 In the detection stage T0, the light control signal of the light control signal terminal Emit is at a high level, so that the third transistors M3 and M4 are turned off. In this way, it can be ensured that in the detection stage, except for the reused first switch unit, the remaining components of the pixel circuit do not work, avoiding affecting the detection result.

[0051] Combination Figure 2 and Figure 3 As shown, optionally, the display driving stage T1 includes a pre-stage t12 and a light-emitting stage t3. In the pre-stage t12, the light-emitting control signal of the light-emitting control signal terminal Emit is used to control the light-emitting control unit 213 to be turned off; the turn-off duration of the light-emitting control unit 213 in the detection stage T0 is H1, and the turn-off duration of the light-emitting control unit 213 in the pre-stage t12 is H2; wherein, H1<H2.

[0052] According to the above description, the pre-stage t12 may specifically include an initialization stage t1 and a data writing stage t2, during which the light emitting control unit 213 is turned off under the control of the light emitting control signal. Figure 2 and Figure 3 As shown, in the pre-stage t12, when the light control signal of the light control signal terminal Emit is at a high level, the third transistor M3 and the fourth transistor M4 (i.e., the light control unit 213) are turned off. Similarly, in the detection stage T0, when the light control signal of the light control signal terminal Emit is at a high level, the third transistor M3 and the fourth transistor M4 (i.e., the light control unit 213) are turned off.

[0053] In this embodiment, by setting the off time H1 of the light control unit 213 in the detection stage T0 to be shorter than the off time H2 of the light control unit 213 in the pre-stage t12, the influence of the detection stage on the display driving stage can be reduced, for example, the influence on the refresh frequency can be reduced to ensure the display effect.

[0054] In a specific embodiment, optionally, H1<0.1H2.

[0055] It should be noted that Figure 3 The example in which the duration of the pre-stage t12 is longer than the total duration of the initialization stage t1 and the data writing stage t2 is used for illustration. In other embodiments, the duration of the pre-stage t12 may also be equal to the total duration of the initialization stage t1 and the data writing stage t2, and the embodiment of the present invention is not limited to this.

[0056] Figure 4 is with Figure 2 The corresponding driving timing diagram of another pixel circuit is as follows: Figure 4 As shown, optionally, in the detection phase T0, the starting time a of the driver chip inputting the excitation signal Sts is located before the starting time b of the enabling phase of the first scanning signal (Scan1).

[0057] Combination Figure 2 and Figure 4 In the enabling phase of the first scanning signal (Scan1), the first switching unit 211 is turned on, and the excitation signal Sts can be input to the first end of the light-emitting element 22 to drive the light-emitting element 22 to emit light. In this embodiment, by setting the starting moment a of the driver chip inputting the excitation signal Sts to be before the starting moment b of the enabling phase of the first scanning signal (Scan1), the excitation signal Sts can be pre-written to the first signal line 30 before the first switching unit 211 is turned on. In this way, when the first switching unit 211 is turned on, the excitation signal Sts can be input to the first end of the light-emitting element 22 through the first switching unit 211, so as to drive the light-emitting element to emit light more quickly and improve the detection efficiency.

[0058] like Figure 4 As shown, optionally, in the detection phase T0, the duration of the driving chip inputting the excitation signal Sts is H3, and the duration of the enabling phase of the first scanning signal (Scan1) is H4; wherein H3>H4.

[0059] Combination Figure 2 and Figure 4In the enabling stage of the first scanning signal (Scan1), the first switching unit 211 is turned on, and the excitation signal Sts can be input to the first end of the light-emitting element 22 to drive the light-emitting element 22 to emit light. It can be understood that the voltage in the rising edge time period and the falling edge time period of the excitation signal Sts is not stable. In this embodiment, by setting the duration H3 of the driver chip inputting the excitation signal Sts to be greater than the duration H4 of the enabling stage of the first scanning signal (Scan1), it is beneficial to make the time period (i.e., H4) when the first switching unit 211 is turned on correspond to the time period (the time period between the rising edge and the falling edge) when the voltage of the excitation signal Sts is in a stable state, thereby providing a stable driving current for the light-emitting element 22 and improving the detection accuracy.

[0060] Figure 5 is with Figure 2 The corresponding driving timing diagram of another pixel circuit is combined with Figure 2 and Figure 5 As shown, optionally, in the detection stage T0, the light control signal of the light control signal terminal Emit includes a non-enabling stage (such as from moment d to moment e), and in the non-enabling stage, the light control unit 213 is turned off; in the detection stage T0, the starting moment d of the non-enabling stage of the light control signal is before the starting moment b of the enabling stage (such as from moment b to moment c) of the first scanning signal.

[0061] Combination Figure 2 and Figure 5 In the detection stage T0, when the light control signal of the light control signal terminal Emit is in the non-enable stage, the light control unit 213 is turned off, and in the enable stage of the first scanning signal (Scan1), the first switch unit 211 is turned on, and the excitation signal Sts can be input to the first end of the light emitting element 22 to drive the light emitting element 22 to emit light. In this embodiment, by setting the starting time d of the non-enable stage of the light control signal to be before the starting time b of the enable stage of the first scanning signal, the path between the light emitting unit 213 and the light emitting element 22 can be blocked in advance to avoid the generation of a signal that affects the detection result in the pixel circuit.

[0062] In summary, the above embodiment takes a pixel circuit whose working process includes both a display driving stage and a detection stage as an example, and explains its structure and driving timing in detail. It should be emphasized that the structure of the pixel circuit is not limited to Figure 2 As shown, any pixel circuit structure that multiplexes the circuit originally used to reset the first end of the light-emitting element into a temperature detection circuit is included in the protection scope of the present invention, and the corresponding driving timing can be adaptively designed, which is not illustrated one by one in the embodiments of the present invention.

[0063] Next, the configuration of the first signal line is further described.

[0064] like Figure 1 As shown, the display module 100 includes a display area AA. Optionally, a plurality of sub-pixels 20 arranged along a direction from the driving chip 10 to the display area AA are electrically connected to the same first signal line 30 .

[0065] In this embodiment, the design of the first signal line 30 is similar to that of the data line (transmitting the data signal Vdata), and the sub-pixels 20 in the same column are electrically connected to the same first signal line 30. In this embodiment, by arranging a plurality of sub-pixels 20 arranged in a direction from the driving chip 10 to the display area AA to be electrically connected to the same first signal line 30, the temperature of part or all of the light-emitting elements can be detected as required, thereby improving the flexibility of temperature detection.

[0066] Specifically, Figure 1 As shown, the display module 100 also includes a plurality of first scan lines G1, and the first scan lines G1 are used to transmit the above-mentioned first scan signal (Scan1). Optionally, the sub-pixels 20 in the same row are electrically connected to the same first scan line G1. Similar to the display driving principle, when temperature detection is performed for all light-emitting elements, the first switch units in the pixel circuits of each row can be opened row by row through each first scan line, and the excitation signal is transmitted to the light-emitting elements in each sub-pixel in the gated state through each first signal line, and the voltage of the first end of the light-emitting element is detected, so as to perform temperature detection of the light-emitting elements row by row. When temperature detection is performed for some light-emitting elements, for any light-emitting element, the first scan signal can be transmitted through the first scan line corresponding to the pixel circuit of the light-emitting element to control the first switch unit in the pixel circuit to open, and the excitation signal and the voltage signal of the first end of the light-emitting element are transmitted through the first signal line corresponding to the pixel circuit of the light-emitting element to realize temperature detection.

[0067] Figure 6 is with Figure 2 The corresponding driving timing diagram of another pixel circuit is as follows: Figure 5 As shown, optionally, the detection stage T0 and the display driving stage T1 do not overlap. This arrangement can distinguish the detection stage from the display driving stage, and the detection stage and the display driving stage can be performed independently, which can reduce the design difficulty on the one hand, and avoid mutual interference between the detection stage and the display driving stage on the other hand.

[0068] Continue to see Figure 6 As a feasible implementation, optionally, the detection stage T0 and the display driving stage T1 are performed alternately. Figure 6Only two display driving stages (such as T11 and T12) of the pixel circuit are shown. According to the above explanation, it can be understood that the display driving stage T11 and the display driving stage T12 respectively represent the stages in which the pixel circuit is used to drive the corresponding light-emitting element to emit light during the display driving process of two adjacent frames. In this embodiment, by setting the detection stage T0 and the display driving stage T1 to be performed alternately, the temperature detection and the picture display can be made at the same frequency, and the temperature change of the light-emitting element can be captured in real time, so as to perform the corresponding brightness compensation in time.

[0069] For example, Figure 6 As shown, for a pixel circuit, a detection stage T0 can be added before each display driving stage T1 to perform temperature detection. Of course, in other embodiments, a detection stage T0 can also be added after each display driving stage T1 of the pixel circuit, and the embodiments of the present invention are not limited to this.

[0070] Figure 7 is with Figure 2 The corresponding driving timing diagram of another pixel circuit is as follows: Figure 7 As shown, in other embodiments, optionally, at least two display driving stages T1 are included between any two detection stages T0. This arrangement can reduce the frequency of temperature detection, and reduce the impact on display while achieving the temperature detection function.

[0071] It should be noted that Figure 7 The example of including two display driving stages T1 between two adjacent detection stages T0 is used for illustration. In other embodiments, more display driving stages T1 may be included between two adjacent detection stages T0, which is not limited in the embodiment of the present invention.

[0072] Figure 8 is with Figure 2 The corresponding driving timing diagram of another pixel circuit is as follows: Figure 8 As shown, optionally, there are at least two different detection stages T0, and the duration of the enabling stage of the first scanning signal (Scan1) is not equal. According to the above explanation, in the enabling stage of the first scanning signal (Scan1), the first switch unit is turned on, and temperature detection can be performed. In this embodiment, the duration of the enabling stage of the first scanning signal corresponding to the detection stages of different time is different, and the detection duration can be adjusted according to demand to improve the flexibility of temperature detection.

[0073] In a specific embodiment, see Figure 8 Optionally, the detection stage T0 includes a first detection stage T01 and a second detection stage T02, and the first detection stage T01 is connected to the nth display driving stage T1. n Adjacent, the second detection stage T02 and the (n+i)th display driving stage T1n+i adjacent; in the first detection stage T01, the duration of the enabling stage of the first scanning signal (Scan1) is H5; in the second detection stage T02, the duration of the enabling stage of the first scanning signal (Scan1) is H6; wherein H5<H6; n and i are both positive integers, i≥1. Specifically, the nth display driving stage T1 n Indicates the display driving stage in the previous frame, the (n+i)th display driving stage T1 n+i Indicates the display driving stage of the later frame. It can be understood that in the display process, the earlier the frame number, the shorter the cumulative working time of the light-emitting element, and the later the frame number, the longer the cumulative working time of the light-emitting element. The longer the working time, the greater the temperature change of the light-emitting element. Therefore, this embodiment sets the duration H5 of the enable phase of the first scanning signal in the first detection stage T01 to be shorter than the duration H6 of the enable phase of the first scanning signal in the second detection stage T02. It is possible to adaptively adjust the duration of temperature detection according to the temperature change of the light-emitting element, which is beneficial to ensure the accuracy of the detection result.

[0074] Based on the same inventive concept, an embodiment of the present invention further provides a method for driving a display module. Fig. 9 is a flow chart of a method for driving a display module provided by an embodiment of the present invention, such as Fig. 9 As shown, the driving method includes the following steps:

[0075] S110, in the detection stage, the driving chip controls the first switch unit to be turned on, and detects the voltage signal of the first end of the target light-emitting element through the first signal line, determines the current temperature of the target light-emitting element according to the voltage signal, and compensates the data voltage of the target sub-pixel according to the current temperature;

[0076] S120 , in the display driving stage, the driving chip controls the first switch unit to be turned on, and writes a reset signal into the first end of the target light emitting element through the first signal line to reset the first end of the target light emitting element.

[0077] The target sub-pixel refers to a sub-pixel that needs to be temperature detected. The light-emitting element of the target sub-pixel is the target light-emitting element, and the pixel circuit of the target sub-pixel is the target pixel circuit. According to the foregoing, the working process of the target pixel circuit includes a detection phase and a display driving phase. Optionally, the multiple sub-pixels of the display module include at least one target sub-pixel.

[0078] Specifically, in the detection phase, the driver chip transmits the first scan signal through the first scan line, so that the first switch unit is turned on in the enable phase of the first scan signal. At the same time, the driver chip also inputs an excitation signal to the light-emitting element through the first signal line to detect the voltage signal of the first end of the light-emitting element when the first switch unit is turned on, and determines the current temperature of the light-emitting element according to the voltage signal; then, the driver chip compensates the data voltage of the target sub-pixel according to the current temperature to achieve brightness compensation. According to the above description, since the second end (cathode) of the light-emitting element receives the same negative power supply voltage, the current forward voltage drop of the light-emitting element can be determined by collecting the voltage of the first end (anode) of the light-emitting element, and then the current temperature of the light-emitting element can be determined according to the mapping relationship between temperature and forward voltage drop. After determining the current temperature, as a feasible implementation method, the compensation data of the data voltage corresponding to the current temperature can be determined according to the mapping relationship between temperature and compensation data, and the brightness compensation of the corresponding sub-pixel is performed to adjust the brightness of the sub-pixel to the standard brightness.

[0079] The working process of the pixel circuit in the display driving stage can be referred to above Figure 2 and Figure 3 The relevant description will not be repeated here.

[0080] The driving method of the display module provided by the embodiment of the present invention multiplexes the first signal line and the first switch unit in the pixel circuit, so that the driving chip resets the first end of the light-emitting element through the first signal line and the first switch unit in the display driving stage of the pixel circuit, and detects the voltage signal of the first end of the light-emitting element through the first signal line and the first switch unit in the detection stage of the pixel circuit. In this way, the temperature of the light-emitting element can be accurately detected without adding other circuit devices and wirings in the display panel, and the structure is simple and the cost is low. In addition, since no other structures are added in the display panel, this solution will not restrict the improvement of the pixel density of the display panel, and will not affect the transmittance of the display panel for a transparent display panel.

[0081] Referring to the above description, optionally, a detection phase T0 (such as Figure 6 ); or, performing a detection phase after each display driving phase; or, performing a detection phase every N display driving phases (such as Figure 7 ); N ≥ 2.

[0082] In addition, the timing design of the above-mentioned display module can be applied to the driving method of the display module provided in the embodiment of the present invention, and has corresponding technical effects, which will not be elaborated herein.

[0083] On the basis of the above embodiment, when the number of target sub-pixels is less than the total number of sub-pixels in the display module, optionally, the driving method further includes: performing data voltage compensation on at least one sub-pixel adjacent to the target sub-pixel according to the current temperature.

[0084] Currently, the resolution of display modules is very high, and the temperatures of light-emitting elements in several adjacent sub-pixels are basically the same. This embodiment only performs temperature detection on a part of the sub-pixels in the display module, and performs data voltage compensation on at least one sub-pixel adjacent to the detected light-emitting element according to the current temperature of the detected light-emitting element. This can achieve brightness compensation while reducing the time occupied by the detection stage and reducing the impact of temperature detection on the display.

[0085] For example, refer to Figure 1 , optional Figure 1 The sub-pixel 20-1 is the target sub-pixel. The working process of designing the pixel circuit in the sub-pixel includes a detection stage and a display driving stage. After the current temperature of the sub-pixel is determined in the detection stage, the current temperature can be determined as the current temperature of the sub-pixels adjacent to the sub-pixel 20-1 (such as 20-1, 20-2, 20-3, 20-4, 20-5, 20-6, 20-7, 20-8 and 20-9), and data voltage compensation is performed on each sub-pixel according to the current temperature.

[0086] Based on the same inventive concept, an embodiment of the present invention further provides a display device. Fig.10 is a schematic diagram of the structure of a display device provided by an embodiment of the present invention, such as Fig.10 As shown, the display device 200 includes the display module 100 provided in any of the above embodiments, and thus has the same beneficial effects as the above display module. The same points can be found in the description of the above embodiments, which will not be repeated here. The display device 200 can be any type of LED display. In addition, the display device 200 provided in the embodiment of the present invention can be Fig.10 The mobile phone shown can also be any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, medical equipment, industrial control equipment, touch interactive terminals, etc. The embodiments of the present invention do not specifically limit this.

[0087] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display module, characterized in that: include: Driver chip; a plurality of first signal lines, wherein the first signal lines are electrically connected to the driving chip and the plurality of first signal lines are insulated from each other; A plurality of sub-pixels, each of which includes a pixel circuit and a light-emitting element, wherein the pixel circuit includes a first switch unit, a first end of the first switch unit is electrically connected to a first end of the light-emitting element, and a second end of the first switch unit is electrically connected to the first signal line; The operation process of at least part of the pixel circuit includes a display driving stage and a detection stage; in the display driving stage, the driving chip is used to reset the first end of the light emitting element through the first signal line and the first switch unit; In the detection stage, the driving chip is used to detect the voltage signal of the first end of the light emitting element through the first signal line and the first switch unit.

2. The display module according to claim 1, characterized in that: The display module includes a display area, and a plurality of sub-pixels arranged along a direction from the driving chip to the display area are electrically connected to the same first signal line.

3. The display module according to claim 1, characterized in that: The detection phase does not overlap with the display driving phase.

4. The display module according to claim 3, characterized in that: The detection phase and the display driving phase are performed alternately; or, At least two display driving stages are included between any two of the detection stages.

5. The display module according to claim 1, characterized in that: The pixel circuit further includes a second switch unit and a driving transistor, wherein a first end of the second switch unit is electrically connected to a gate of the driving transistor, and a second end of the second switch unit is electrically connected to the first signal line; The control end of the first switch unit is electrically connected to the first scan signal end, and the control end of the second switch unit is electrically connected to the second scan signal end; In the detection phase, the first scan signal at the first scan signal end is used to control the first switch unit to be turned on, and the second scan signal at the second scan signal end is used to control the second switch unit to be turned off.

6. The display module according to claim 1, characterized in that: The pixel circuit further includes a light emitting control unit, the light emitting control unit is electrically connected to the first end of the light emitting element, and the control end of the light emitting control unit is electrically connected to the light emitting control signal end; In the detection phase, the light-emitting control signal at the light-emitting control signal terminal is used to control the light-emitting control unit to be turned off.

7. The display module according to claim 6, characterized in that: The display driving stage includes a pre-stage and a light-emitting stage. In the pre-stage, the light-emitting control signal at the light-emitting control signal terminal is used to control the light-emitting control unit to turn off; The off time length of the light emitting control unit in the detection phase is H1, and the off time length of the light emitting control unit in the pre-phase is H2; wherein, H1<H2.

8. The display module according to claim 7, characterized in that: H1<0.1H2.

9. The display module according to claim 1, characterized in that: The control end of the first switch unit is electrically connected to the first scan signal end. In the detection phase, the first scan signal of the first scan signal end includes an enable phase. In the enable phase, the first switch unit is turned on. In the detection stage, the driving chip is used to input an excitation signal to the light-emitting element through the first signal line to detect a voltage signal at the first end of the light-emitting element when the first switch unit is turned on, and determine the temperature of the light-emitting element according to the voltage signal.

10. The display module according to claim 9, characterized in that: In the detection phase, the start time of the driving chip inputting the excitation signal is before the start time of the enabling phase of the first scanning signal.

11. The display module according to claim 9, characterized in that: In the detection phase, the duration of the drive chip inputting the excitation signal is H3, and the duration of the enabling phase of the first scanning signal is H4; wherein, H3>H4.

12. The display module according to claim 9, characterized in that: The pixel circuit further includes a light emitting control unit, the light emitting control unit is electrically connected to the first end of the light emitting element, the control end of the light emitting control unit is electrically connected to the light emitting control signal end, and in the detection phase, the light emitting control signal at the light emitting control signal end includes a non-enabling phase, and in the non-enabling phase, the light emitting control unit is turned off; In the detection phase, a start time of a non-enable phase of the light emitting control signal is located before a start time of an enable phase of the first scanning signal.

13. The display module according to claim 9, characterized in that: There are at least two different detection phases, and the durations of the enabling phases of the first scanning signal are not equal.

14. The display module according to claim 13, characterized in that: The detection phase includes a first detection phase and a second detection phase, the first detection phase is adjacent to the nth display driving phase, and the second detection phase is adjacent to the (n+i)th display driving phase; in the first detection phase, the duration of the enabling phase of the first scanning signal is H5; in the second detection phase, the duration of the enabling phase of the first scanning signal is H6; wherein, H5<H6; n and i are both positive integers, i≥1.

15. The display module according to claim 1, characterized in that: The pixel circuit further includes a driving transistor, the first switching unit includes a first transistor, and a width-to-length ratio of the first transistor is smaller than a width-to-length ratio of the driving transistor.

16. A method for driving a display module, applied to the display module according to any one of claims 1 to 15, characterized in that: The multiple sub-pixels of the display module include at least one target sub-pixel, the light-emitting element of the target sub-pixel is a target light-emitting element, the pixel circuit of the target sub-pixel is a target pixel circuit, the working process of the target pixel circuit includes a detection stage and a display driving stage, and the driving method includes: In the detection stage, the driver chip controls the first switch unit to be turned on, and detects the voltage signal of the first end of the target light-emitting element through the first signal line, determines the current temperature of the target light-emitting element according to the voltage signal, and compensates the data voltage of the target sub-pixel according to the current temperature; In the display driving stage, the driving chip controls the first switch unit to be turned on, and writes a reset signal into the first end of the target light emitting element through the first signal line to reset the first end of the target light emitting element.

17. The driving method according to claim 16, characterized in that: The detection phase is performed before each display driving phase; or, performing the detection phase after each of the display driving phases; or, The detection phase is performed once every N display driving phases; N≥2.

18. The driving method according to claim 16, characterized in that: The number of the target sub-pixels is less than the total number of sub-pixels in the display module, and the driving method further includes: Data voltage compensation is performed on at least one sub-pixel adjacent to the target sub-pixel according to the current temperature.

19. A display device, characterized in that: A display module comprising any one of claims 1-15.

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