A display module and its driving method, and a display device.

Abstract

This invention discloses a display module and its driving method and display device. The display module includes a driving chip, multiple first signal lines, and multiple sub-pixels. The first signal lines are electrically connected to the driving chip, and the multiple first signal lines are mutually insulated. Each sub-pixel includes a pixel circuit and a light-emitting element. The pixel circuit includes a first switching unit, with a first end electrically connected to a first end of the light-emitting element and a second end electrically connected to the first signal lines. The operation 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 resets the first end of the light-emitting element through the first signal lines and the first switching unit. In the detection stage, the driving chip detects the voltage signal at the first end of the light-emitting element through the first signal lines and the first switching unit. The technical solution of this invention can accurately detect the temperature of the light-emitting element and has a simple structure and low cost.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display module and its driving method, and a display device. Background Technology

[0002] In LED display panels, the characteristics of the light-emitting elements are significantly affected by temperature changes. Especially when the display panel displays images for extended periods, the light-emitting elements dissipate a large amount of heat, resulting in high temperatures and significant shifts in their characteristics. This can lead to deviations in the brightness or color performance of the display panel.

[0003] In response, related technologies require temperature detection of the light-emitting elements to adjust the brightness of the display panel accordingly based on temperature changes. However, current detection methods, such as setting up detection circuit modules or temperature detection metal traces, often suffer from problems such as complex structures, high costs, and / or poor detection accuracy. Summary of the Invention

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

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

[0006] Driver chip;

[0007] Multiple first signal lines are electrically connected to the driver chip, and the multiple first signal lines are insulated from each other;

[0008] Multiple sub-pixels, each sub-pixel includes a pixel circuit and a light-emitting element. The pixel circuit includes a first switching unit, a first end of which is electrically connected to a first end of the light-emitting element, and a second end of which is electrically connected to a first signal line.

[0009] The operation 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 switching 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 switching unit.

[0010] According to another aspect of the present invention, a driving method for a display module is provided, applied to a display module provided in any embodiment of the present invention. The display module has multiple sub-pixels, including at least one target sub-pixel. The light-emitting element of the target sub-pixel is a target light-emitting element, and the pixel circuit of the target sub-pixel is a target pixel circuit. The operation of the target pixel circuit includes a detection stage and a display driving stage. The driving method includes:

[0011] During the detection phase, the driver chip controls the first switching unit to turn on and detects the voltage signal at the first end of the target light-emitting element through the first signal line. Based on the voltage signal, the current temperature of the target light-emitting element is determined, and the data voltage of the target sub-pixel is compensated according to the current temperature.

[0012] During the display driving stage, the driver chip controls the first switching unit to be turned on, and writes a reset signal to 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 in any embodiment of the present invention.

[0014] The technical solution of this invention provides that 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 switching 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 switching unit during 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 switching unit during 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 wiring in the display panel. The structure is simple and the cost is low. In addition, since no other structures are added to the display panel, this solution will not restrict the improvement of the pixel density of the display panel, and for transparent display panels, it will not affect the light transmittance of the display panel.

[0015] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a display module provided in an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A schematic diagram of the specific structure of region Q in the middle;

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

[0020] Figure 4 Is with Figure 2 The corresponding timing diagram for another pixel circuit;

[0021] Figure 5 Is with Figure 2 The corresponding timing diagram for another pixel circuit;

[0022] Figure 6 Is with Figure 2 The corresponding timing diagram for another pixel circuit;

[0023] Figure 7 Is with Figure 2 The corresponding timing diagram for another pixel circuit;

[0024] Figure 8 Is with Figure 2 The corresponding timing diagram for another pixel circuit;

[0025] Figure 9 This is a flowchart illustrating a driving method for a display module provided in an embodiment of the present invention;

[0026] Figure 10 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0028] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in this application can be combined with each other without contradiction.

[0029] First, it should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "comprising" and similar terms mean that the element or object preceding the word encompasses the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes. Furthermore, the shapes and sizes of the components in the accompanying drawings do not reflect actual proportions and are only intended to illustrate the content of this invention.

[0030] Figure 1 This is a schematic diagram of the structure of a display module provided in an embodiment of the present invention. Figure 2 yes Figure 1 A detailed structural diagram of region Q in the middle region is shown below. Figure 1 and Figure 2 As shown, the display module 100 provided in this embodiment of the invention includes a driver chip 10, a plurality of sub-pixels 20, and a plurality of first signal lines 30; the first signal lines 30 are electrically connected to the driver chip 10, and the plurality of first signal lines 10 are mutually insulated; the sub-pixels 20 include a pixel circuit 21 and a light-emitting element 22, the pixel circuit 21 includes a first switching unit 211, the first end of the first switching unit 211 is electrically connected to the first end of the light-emitting element 22, and the second end of the first switching unit 211 is electrically connected to the first signal line 30; the operation process of at least a portion of the pixel circuit includes a display driving stage and a detection stage; in the display driving stage, the driver chip 10 is used to reset the first end of the light-emitting element 22 through the first signal line 30 and the first switching unit 211; in the detection stage, the driver 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 switching 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] During their research, the inventors discovered that when a light-emitting diode (LED) emits light under the influence of a driving current, its forward voltage drop—that is, the voltage difference between the anode and cathode—changes with temperature. Specifically, the forward voltage drop of the LED decreases as the temperature increases. Since the second terminal (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 at the first terminal (anode). Furthermore, the current temperature of the light-emitting element can be determined based on the mapping relationship between temperature and forward voltage drop. Subsequently, brightness compensation can be performed on the corresponding sub-pixels based on the current temperature of the light-emitting element, adjusting the brightness of the sub-pixels to the standard brightness.

[0033] Furthermore, in this embodiment of the invention, the voltage signal at the first end of the light-emitting element is acquired by multiplexing the first signal line 30 and the first switching unit 211 used to reset the first end of the light-emitting element 22 during the display driving stage, and using the first signal line 30 and the first switching unit to detect the voltage signal at the first end of the light-emitting element 22 during the detection stage. This configuration allows the voltage at the first end of the light-emitting element to be detected using the existing circuit structure (i.e., the first switching unit) and existing signal lines (i.e., the first signal line) within the display panel. Combined with a driver chip that has temperature data processing capabilities, temperature detection can be achieved. This ensures detection accuracy without adding additional circuit components and wiring within the display panel, resulting in a simple structure and low cost. Furthermore, since no additional structures are added to the display panel, this solution does not restrict the improvement of the pixel density of the display panel, nor does it affect the light transmittance of transparent display panels.

[0034] The display driving stage is the stage where the pixel circuit drives the light-emitting element to emit light, realizing the display function. It can be understood that each pixel circuit drives its corresponding light-emitting element to emit light during its display driving stage, enabling the display of one frame of an image. During the display driving stage, the driving chip resets the first end of the light-emitting element through the first signal line and the first switching unit, preventing residual charge from the previous frame from remaining on the first end of the light-emitting element and ensuring display quality. The specific process of the pixel circuit in the display driving stage will be described in detail later, and will not be elaborated upon here.

[0035] The detection stage involves detecting the voltage at the first terminal of the light-emitting element to achieve temperature detection. The operation of at least some of the pixel circuits includes both a display driving stage and a detection stage. Specifically, for multiple light-emitting elements in a display module, only the voltage at the first terminal of some of the light-emitting elements needs to be detected. In this case, the operation of the pixel circuit corresponding to these light-emitting elements only needs to include both the display driving stage and the detection stage. The pixel circuits corresponding to the remaining light-emitting elements only include the display driving stage; that is, the operation of some pixel circuits includes both the display driving stage and the detection stage. Alternatively, the voltage at the first terminal of all light-emitting elements can be detected, in which case all pixel circuits include both the display driving stage and the detection stage.

[0036] In summary, in the display module provided by the embodiments of the present invention, the operation process of at least some pixel circuits includes a display driving stage and a detection stage. By reusing the first signal line and the first switching 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 switching 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 switching 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 wiring in the display panel. 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 transparent display panels, it will not affect the light transmittance of the display panel.

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

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

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

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

[0041] It should be noted that the first and second terminals of the aforementioned transistors (such as M0 to M6) refer to the source and drain of the transistor, respectively. For example, the first terminal of the transistor may be the source and the second terminal the drain, or vice versa. It should also be noted that each transistor can be a P-type transistor or an N-type transistor. Figure 2 The illustration is based on the example where all transistors are P-type. In other embodiments, some transistors may be N-type and some may be P-type.

[0042] In addition, such as Figure 2 As shown, optionally, the pixel circuit 21 further includes a storage capacitor Cst, the first end of which is electrically connected to the first power supply signal terminal PVDD, and the second end of which 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 for a pixel circuit, combined with Figures 1-3As shown, the display driving stage T1 of the pixel circuit includes an initialization stage t1, a data writing stage t2, and a light emission 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 scan control signal sent by the second scan control signal terminal Scan2. The initialization signal Vref is written to the gate of the driving transistor T1, initializing the gate of the driving transistor M0. In the data writing stage t2, the fifth transistor M5 is turned on under the control of the first scan control signal sent by the first scan control signal terminal Scan1, and the sixth transistor M6 is turned on under the control of the first scan control signal sent by the first scan control signal terminal Scan1. At the same time, 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 from the data signal terminal Vdata to the gate of the driving transistor M0. Simultaneously, the sixth transistor M6 compensates the threshold voltage of the driving transistor M0 to the gate of the driving transistor M0. Furthermore, during the data writing phase t2, the driver chip applies a reset signal to the first signal terminal X (this reset signal can be the same as the initialization signal Vref mentioned above). The first transistor M1 is turned on under the control of the first scan control signal sent by the first scan control signal terminal Scan1, writing the reset signal to the first terminal (anode) of the light-emitting element 22, thus resetting the first terminal of the light-emitting element 22. During 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 at the light-emitting control signal terminal Emit. Since the storage capacitor Cst stores the gate potential of the driver transistor M0, the driver transistor M0 generates a driving current based on the gate potential and the potential of the first power supply signal terminal PVDD, driving the light-emitting element 22 to emit light.

[0044] In addition, combined Figure 2 and Figure 3 As shown, optionally, the operation of the pixel circuit also includes a detection stage T0. In the detection stage T0, the first scan signal of the first scan signal terminal Scan1 includes an enable stage (such as from time b to time c). In the enable stage, the first switch unit 211 is turned on. In the detection stage T0, the driver 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 of the first terminal 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 based on the voltage signal Vts.

[0045] The enable phase of the first scan signal is the phase in which the first scan signal turns on the first switching unit. For example, Figure 2 In the first switching unit 211, the first switching unit is composed of the first transistor M1. When the first scan signal is low, the first transistor M1 is turned on. At this time, the period when the first scan signal is low is the enable phase of the first scan signal.

[0046] The excitation signal Sts powers the light-emitting element 22, driving it to emit light. (See reference...) Figure 2 and Figure 3 During the detection phase T0, the driver chip applies an excitation signal Sts to the first signal terminal X. When the first switching unit 211 is turned on, this excitation signal can be input to the light-emitting element 22 through the first signal line 30 and the first switching unit 211, driving the light-emitting element 22 to emit light. At the same time, the driver chip can detect the voltage signal Vts at the first terminal of the light-emitting element 22 through the first signal line 30 when the first switching unit 211 is turned on, and determine the temperature of the light-emitting element based on the voltage signal Vts. Specifically, during the light-emitting period of the light-emitting element, if the temperature changes, the voltage at the first terminal of the light-emitting element 22 will change slightly, causing a slight change in the voltage on the first signal line 30. 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 its internal detection unit, determine the amount of voltage change, and thus determine the amount of voltage change at the first terminal of the light-emitting element 22, i.e., determine the forward voltage drop. Furthermore, the current temperature of the light-emitting element can be determined based on the mapping relationship between temperature and forward voltage drop.

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

[0048] Reference Figure 2 Optionally, the aspect ratio of the first transistor M1 is smaller than that of the driving transistor M0. This setting can reduce the leakage current of the first transistor, ensure that the signal is not distorted, and improve the accuracy of the detection results.

[0049] Furthermore, combined Figure 2 and Figure 3 As shown, optionally, during the detection phase T0, the first scan signal at the first scan signal terminal Scan1 is used to control the first switching unit 211 to turn on, and the second scan signal at the second scan signal terminal Scan2 is used to control the second switching unit 212 to turn off. For example, combined with... Figure 2 and Figure 3During the detection phase T0, the first scan signal at the first scan signal terminal Scan1 is at a low level, turning on the first transistor M1, while the second scan signal at the second scan signal terminal Scan2 is at a high level, turning off the second transistor M1. This ensures that the path between the first signal line 30 and the first switching unit 211 is open, while the path between the first signal line 30 and the second switching unit 212 is closed. This guarantees that during the detection phase, apart from the multiplexed first switching unit, the other components in the pixel circuit do not operate, avoiding any impact on the detection results.

[0050] In addition, combined Figure 2 and Figure 3 As shown, optionally, during the detection phase T0, the light emission control signal at the Emit terminal is used to control the light emission control unit 213 to turn off. For example, in conjunction with... Figure 2 and Figure 3 During the detection phase T0, the light emission control signal at the Emit terminal is at a high level, which turns off the third transistors M3 and M4. This ensures that during the detection phase, apart from the multiplexed first switching unit, the other components of the pixel circuit do not work, thus avoiding any impact on the detection results.

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

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

[0053] In this embodiment, by setting the off-time H1 of the light-emitting control unit 213 in the detection phase T0 to be less than the off-time H2 of the light-emitting control unit 213 in the pre-stage t12, the impact of the detection phase on the display driving phase can be reduced, such as reducing the impact on the refresh rate, thus ensuring the display effect.

[0054] In one specific embodiment, H1 may optionally be less than 0.1H2.

[0055] It should be noted that, Figure 3 The example given is that the duration of the pre-stage t12 is greater than the total duration of the initialization stage t1 and the data writing stage t2. 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. This embodiment of the invention does not limit this.

[0056] Figure 4 Is with Figure 2 The corresponding driving timing diagram for another pixel circuit is as follows: Figure 4 As shown, optionally, during the detection phase T0, the start time a of the driver chip input excitation signal Sts is located before the start time b of the enable phase of the first scan signal (Scan1).

[0057] Combination Figure 2 and Figure 4 During the enable phase of the first scan 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 start time a of the driver chip inputting the excitation signal Sts to be before the start time b of the enable phase of the first scan signal (Scan1), the excitation signal Sts can be pre-written onto the first signal line 30 before the first switch unit 211 is turned on. In this way, when the first switch 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 switch unit 211, driving the light-emitting element to emit light more quickly and improving detection efficiency.

[0058] like Figure 4 As shown, optionally, in the detection phase T0, the duration of the excitation signal Sts input by the driver chip is H3, and the duration of the enable phase of the first scan signal (Scan1) is H4; where H3 > H4.

[0059] Combination Figure 2 and Figure 4During the enable phase of the first scan signal (Scan1), the first switching unit 211 is turned on, and the excitation signal Sts can be input to the first terminal of the light-emitting element 22 to drive the light-emitting element 22 to emit light. It is understood that the voltage during the rising edge and falling edge time periods of the excitation signal Sts is not stable. In this embodiment, by setting the duration H3 of the excitation signal Sts input by the driver chip to be greater than the duration H4 of the enable phase of the first scan signal (Scan1), it is beneficial to make the time period during which the first switching unit 211 is turned on (i.e., H4) correspond to the time period during which the voltage of the excitation signal Sts is in a stable state (the time period between the rising edge and the falling edge), so as to provide a stable driving current for the light-emitting element 22 and improve the detection accuracy.

[0060] Figure 5 Is with Figure 2 The corresponding driving timing diagram of another pixel circuit, combined with Figure 2 and Figure 5 As shown, optionally, during the detection phase T0, the light emission control signal of the light emission control signal terminal Emit includes a non-enabling phase (such as from time d to time e). During the non-enabling phase, the light emission control unit 213 is turned off. During the detection phase T0, the start time d of the non-enabling phase of the light emission control signal is located before the start time b of the enabling phase of the first scan signal (such as from time b to time c).

[0061] Combination Figure 2 and Figure 5 During the detection phase T0, when the light emission control signal of the Emit terminal is in the disabled phase, the light emission control unit 213 is turned off. During the enabled phase of the first scan signal (Scan1), the first switch unit 211 is turned on, and the excitation signal Sts can be input to the first terminal of the light emission element 22 to drive the light emission element 22 to emit light. In this embodiment, by setting the start time d of the disabled phase of the light emission control signal to be before the start time b of the enabled phase of the first scan signal, the path between the light emission unit 213 and the light emission element 22 can be blocked in advance to avoid the generation of signals that affect the detection results in the pixel circuit.

[0062] In summary, the above embodiments use a pixel circuit whose working process simultaneously includes a display driving stage and a detection stage as an example to provide a detailed description of its structure and driving timing. It should be emphasized that the structure of the pixel circuit is not limited to this. Figure 2 As shown, all pixel circuit structures that reuse the original circuit used to reset the first end of the light-emitting element as a temperature detection circuit are included within the protection scope of this invention. The corresponding driving timing can be adapted, and this embodiment of the invention will not illustrate them one by one.

[0063] The following section provides further explanation of how the first signal line is configured.

[0064] like Figure 1 As shown, the display module 100 includes a display area AA. Optionally, a plurality of sub-pixels 20 arranged along the direction of the driving chip 10 pointing 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 data signal Vdata), with the same column of sub-pixels 20 electrically connected to the same first signal line 30. By arranging multiple sub-pixels 20 along the direction from the driver chip 10 to the display area AA and electrically connecting them to the same first signal line 30, temperature detection can be performed on some or all of the light-emitting elements as needed, improving the flexibility of temperature detection.

[0066] Specifically, such as Figure 1 As shown, the display module 100 also includes multiple first scan lines G1, which are used to transmit the aforementioned first scan signal (Scan1). Optionally, 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 on all light-emitting elements, the first switching unit in the pixel circuit of each row can be turned on row by row through each first scan line, and the excitation signal and the voltage of the first terminal of the light-emitting element can be transmitted to the light-emitting element in each selected sub-pixel through each first signal line, so as to perform temperature detection of the light-emitting elements row by row. When temperature detection is performed on 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 switching unit in the pixel circuit to turn on, and the excitation signal and the voltage signal of the first terminal of the light-emitting element can be 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 for another pixel circuit is as follows: Figure 5 As shown, optionally, the detection phase T0 and the display driving phase T1 do not overlap. This setting can distinguish the detection phase from the display driving phase, allowing them to be performed independently. This reduces design complexity and avoids interference between the two phases.

[0068] See also Figure 6 As a possible implementation, the detection phase T0 and the display driving phase T1 can be performed alternately. Figure 6Only two display driving stages of the pixel circuit (such as T11 and T12) are shown. As explained above, display driving stages T11 and T12 represent the stages in which the pixel circuit drives the corresponding light-emitting elements to emit light during the display driving process of two adjacent frames. This embodiment, by setting the detection stage T0 to alternate with the display driving stage T1, allows temperature detection to occur at the same frequency as the screen display, capturing the temperature changes of the light-emitting elements in real time for timely brightness compensation.

[0069] For example, such as 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. This embodiment of the invention does not limit this.

[0070] Figure 7 Is with Figure 2 The corresponding driving timing diagram for 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 configuration can reduce the frequency of temperature detection, thus reducing the impact on the display while still achieving the temperature detection function.

[0071] It should be noted that, Figure 7 The illustration only takes the example of two adjacent detection stages T0 including two display driving stages T1. In other embodiments, two adjacent detection stages T0 may include more display driving stages T1, and the embodiments of the present invention do not limit this.

[0072] Figure 8 Is with Figure 2 The corresponding driving timing diagram for 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 enable stage of the first scan signal (Scan1) is not equal. As explained above, during the enable stage of the first scan signal (Scan1), the first switching unit is turned on, and temperature detection can be performed. In this embodiment, the enable stage of the first scan signal corresponding to different detection stages is set to have different durations, which can adjust the detection duration according to needs and improve the flexibility of temperature detection.

[0073] In one specific embodiment, see further. Figure 8 Optionally, the detection phase T0 includes a first detection phase T01 and a second detection phase T02, wherein the first detection phase T01 is related to the nth display driving phase T1. n Adjacent to each other, 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 enable phase of the first scan signal (Scan1) is H5; in the second detection stage T02, the duration of the enable phase of the first scan signal (Scan1) is H6; where H5 < H6; n and i are both positive integers, i ≥ 1. Specifically, the nth display driving stage T1 n This indicates the (n+i)th display driving stage T1 in the previous frame's display driving phase. n+i This indicates that during the display driving stage of the subsequent frame, it is understandable that 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, in this embodiment, by setting the duration H5 of the enable phase of the first scan signal in the first detection stage T01 to be shorter than the duration H6 of the enable phase of the first scan signal in the second detection stage T02, the duration of temperature detection can be adaptively adjusted according to the temperature change of the light-emitting element, which is beneficial to ensuring the accuracy of the detection results.

[0074] Based on the same inventive concept, embodiments of the present invention also provide a driving method for a display module. Figure 9 This is a flowchart illustrating a driving method for a display module provided in an embodiment of the present invention, as shown below. Figure 9 As shown, the driving method includes the following steps:

[0075] S110. During the detection phase, the driver chip controls the first switching unit to turn on and detects the voltage signal at the first end of the target light-emitting element through the first signal line. Based on the voltage signal, the current temperature of the target light-emitting element is determined, and the data voltage of the target sub-pixel is compensated based on the current temperature.

[0076] S120. In the display driving stage, the driver chip controls the first switching unit to be turned on, and writes a reset signal to 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] Here, the target sub-pixel refers to the sub-pixel that requires temperature detection. The light-emitting element of the target sub-pixel is called the target light-emitting element, and the pixel circuit of the target sub-pixel is called the target pixel circuit. As mentioned earlier, the operation of the target pixel circuit includes a detection stage and a display driving stage. Optionally, the multiple sub-pixels of the display module include at least one target sub-pixel.

[0078] Specifically, during the detection phase, the driver chip transmits a first scan signal through the first scan line, enabling the first switching unit to conduct during the enable phase of the first scan signal. Simultaneously, the driver chip also inputs an excitation signal to the light-emitting element through the first signal line to detect the voltage signal at the first terminal of the light-emitting element when the first switching unit is turned on, and determines the current temperature of the light-emitting element based on the voltage signal. Then, the driver chip compensates the data voltage of the target sub-pixel based on this current temperature to achieve brightness compensation. As described above, since the second terminal (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 acquiring the voltage at the first terminal (anode). Furthermore, the current temperature of the light-emitting element can be determined based on the mapping relationship between temperature and forward voltage drop. After determining the current temperature, as a feasible implementation, the compensation data for the data voltage corresponding to the current temperature can be determined based on the mapping relationship between temperature and compensation data, and brightness compensation can be performed on the corresponding sub-pixel 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 the above text. Figure 2 and Figure 3 The relevant descriptions will not be repeated here.

[0080] The driving method for the display module provided in this embodiment of the invention reuses a first signal line and a first switching unit in the pixel circuit. This allows the driving chip to reset the first end of the light-emitting element through the first signal line and the first switching unit during the display driving stage of the pixel circuit, and also allows the driving chip to detect the voltage signal of the first end of the light-emitting element through the first signal line and the first switching unit during the detection stage of the pixel circuit. In this way, the temperature of the light-emitting element can be accurately detected without adding any other circuit devices and wiring in the display panel. The structure is simple and the cost is low. Furthermore, since no other structures are added to the display panel, this solution will not restrict the improvement of the pixel density of the display panel, and it will not affect the light transmittance of the display panel for transparent display panels.

[0081] Referring to the description above, optionally, a detection phase T0 is performed before each display driving phase T1 (e.g., Figure 6 Alternatively, a detection phase can be performed after each display driving phase; or, a detection phase can be performed every N display driving phases (e.g., ...). Figure 7 ); N≥2.

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

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

[0084] Currently, display modules have high resolution, and the temperatures of the light-emitting elements in several neighboring sub-pixels are basically the same. In this embodiment, temperature detection is performed on only a portion of the sub-pixels in the display module, and data voltage compensation is performed on at least one adjacent sub-pixel based on the current temperature of the detected light-emitting element. This can reduce the time occupied by the detection stage and reduce the impact of temperature detection on the display while achieving brightness compensation.

[0085] For example, refer to Figure 1 Optional Figure 1 Sub-pixel 20-1 is the target sub-pixel. The working process of the pixel circuit in this sub-pixel includes a detection stage and a display driving stage. After determining the current temperature of the sub-pixel in the detection stage, this current temperature can be determined as the current temperature of the sub-pixels adjacent to 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, embodiments of the present invention also provide a display device. For example, Figure 10 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention, such as... Figure 10 As shown, the display device 200 includes the display module 100 provided in any of the above embodiments, and therefore has the same beneficial effects as the above display module. The similarities can be found in the descriptions of the above embodiments, and will not be repeated here. The display device 200 can be any type of LED display. Furthermore, the display device 200 provided in the embodiments of the present invention can be... Figure 10 The mobile phone shown can also be any electronic product with display function, including but not limited to the following categories: television, laptop, desktop monitor, tablet computer, digital camera, smart bracelet, smart glasses, in-vehicle display, medical equipment, industrial control equipment, touch interactive terminal, etc. The embodiments of the present invention do not make any special limitations on this.

[0087] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A display module, characterized in that, include: Driver chip; Multiple first signal lines are electrically connected to the driver chip, and the multiple first signal lines are mutually insulated. Multiple sub-pixels, each sub-pixel including a pixel circuit and a light-emitting element, the pixel circuit including a first switching unit, a first end of the first switching unit being electrically connected to a first end of the light-emitting element, and a second end of the first switching unit being electrically connected to the first signal line; The operation 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 switching unit; During the detection phase, the driver chip is used to detect the voltage signal at the first end of the light-emitting element through the first signal line and the first switching 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 the direction of the driving chip pointing 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 and the display driving phase do not overlap.

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 of the 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 switching unit and a driving transistor. The first end of the second switching unit is electrically connected to the gate of the driving transistor, and the second end of the second switching unit is electrically connected to the first signal line. The control terminal of the first switching unit is electrically connected to the first scanning signal terminal, and the control terminal of the second switching unit is electrically connected to the second scanning signal terminal; During the detection phase, the first scan signal at the first scan signal terminal is used to control the first switch unit to turn on, and the second scan signal at the second scan signal terminal is used to control the second switch unit to turn off.

6. The display module according to claim 1, characterized in that, The pixel circuit also includes a light-emitting control unit, which 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; During the detection phase, the light emission control signal at the light emission control signal terminal is used to control the light emission control unit to turn off.

7. The display module according to claim 6, characterized in that, The display driving stage includes a pre-stage and an emissive stage. In the pre-stage, the emissive control signal at the emissive control signal terminal is used to control the emissive control unit to turn off. The off-time of the light-emitting control unit during the detection phase is H1, and the off-time of the light-emitting control unit during the pre-processing 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 terminal of the first switching unit is electrically connected to the first scanning signal terminal. During the detection phase, the first scanning signal of the first scanning signal terminal includes an enable phase, during which the first switching unit is turned on. During the detection phase, the driving chip is used to input an excitation signal to the light-emitting element through the first signal line, so as to detect the voltage signal at the first end of the light-emitting element when the first switching unit is turned on, and determine the temperature of the light-emitting element based on the voltage signal.

10. The display module according to claim 9, characterized in that, During the detection phase, the start time of the excitation signal input by the driver chip is earlier than the start time of the enable phase of the first scan signal.

11. The display module according to claim 9, characterized in that, During the detection phase, the duration of the excitation signal input to the driver chip is H3, and the duration of the enable phase of the first scan signal is H4; wherein, H3 > H4.

12. The display module according to claim 9, characterized in that, The pixel circuit also includes a light-emitting control unit, which 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. During the detection phase, the light-emitting control signal of the light-emitting control signal end includes a de-enabled phase. During the de-enabled phase, the light-emitting control unit is turned off. During the detection phase, the start time of the de-enabling phase of the light emission control signal is earlier than the start time of the enabling phase of the first scan signal.

13. The display module according to claim 9, characterized in that, There are at least two distinct detection phases, with the duration of the enable phase of the first scan signal being unequal.

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 enable phase of the first scan signal is H5; in the second detection phase, the duration of the enable phase of the first scan signal is H6. 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, and the first switching unit includes a first transistor, the aspect ratio of which is smaller than that of the driving transistor.

16. A driving method for a display module, applied to the display module according to any one of claims 1-15, characterized in that, The display module includes at least one target sub-pixel among its multiple sub-pixels. The light-emitting element of the target sub-pixel is a target light-emitting element, and the pixel circuit of the target sub-pixel is a target pixel circuit. The operation of the target pixel circuit includes a detection stage and a display driving stage. The driving method includes: During the detection phase, the driver chip controls the first switching unit to turn on and detects the voltage signal at the first end of the target light-emitting element through the first signal line. Based on the voltage signal, the current temperature of the target light-emitting element is determined, and the data voltage of the target sub-pixel is compensated based on the current temperature. During the display driving phase, the driving chip controls the first switching unit to be turned on, and writes a reset signal to 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, The detection phase is performed after each of the aforementioned display driving phases; or, The detection phase is executed once every N display driving phases; N≥2.

18. The driving method according to claim 16, characterized in that, The number of 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 based on the current temperature.

19. A display device, characterized in that, Includes the display module as described in any one of claims 1-15.

Images