Display device and display method thereof

Abstract

The invention provides a display device and a display method thereof, the display device comprises a plurality of pixels, a sub-pixel in the pixels comprises a light emitting element and a pixel circuit which are electrically connected, when the gray-scale value of the sub-pixel is smaller than or equal to a preset gray-scale value, digital signals corresponding to different gray-scale values are different, analog signals corresponding to different gray-scale values are all preset analog signals, and when the gray-scale value of the sub-pixel is smaller than or equal to the preset gray-scale value, the digital signals are different. The pixel circuit is used for driving a corresponding light-emitting element to emit light according to a preset analog signal and a digital signal of a gray-scale value, and the preset gray-scale value is the gray-scale value corresponding to the current density when the light-emitting efficiency of the light-emitting element is maximum; the current density of the light-emitting element is the current density when the light-emitting efficiency of the light-emitting element is maximum, the overall power consumption of the display device during image display is reduced, and application of the display device to scenes such as virtual reality is facilitated.

Description

Technical Field

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

[0002] Silicon-based Micro LED (Micro Light Emitting Diode) display panels currently use a digital sub-field scanning method for display driving. That is, a frame can be divided into multiple sub-frames with different weights. Different weights indicate that the corresponding luminous durations of sub-pixels are different. The sub-pixels emit or do not emit light accordingly based on the value of each sub-frame. The luminous durations of multiple sub-frames are superimposed to present the brightness of the grayscale corresponding to the frame.

[0003] However, due to the small size of silicon-based Micro LED display panels, their current density is particularly high when displaying higher grayscale brightness. According to the curve relationship between Micro LED's luminous efficiency and current density, the corresponding luminous efficiency of Micro LED is reduced when the current density is higher, resulting in the silicon-based Micro LED panel requiring higher power consumption to ensure that the panel can display higher grayscale brightness. As a result, the overall power consumption of the silicon-based Micro LED display panel is higher when displaying images, which is not conducive to the application of silicon-based Micro LED display panels in scenarios such as virtual reality. Summary of the Invention

[0004] Embodiments of the present invention provide a display device and a display method thereof to optimize the power consumption of a silicon-based Micro LED panel to facilitate its application in scenarios such as virtual reality.

[0005] An embodiment of the present invention provides a display device including a plurality of pixels, each pixel including at least one sub-pixel, each sub-pixel including a light-emitting element and a pixel circuit electrically connected;

[0006] When the grayscale value of the sub-pixel is less than or equal to a preset grayscale value, different grayscale values ​​correspond to different digital signals, and the analog signals corresponding to different grayscale values ​​are all preset analog signals, and the pixel circuit is used to drive the corresponding light-emitting element to emit light according to the preset analog signal and the digital signal of the grayscale value;

[0007] Among them, the preset grayscale value is the grayscale value corresponding to the current density of the light-emitting element when the luminous efficiency is maximum. When the preset analog signal acts on the pixel circuit, the current density of the light-emitting element is the current density of the light-emitting element when the luminous efficiency is maximum.

[0008] In some embodiments, when the grayscale value of the sub-pixel is greater than the preset grayscale value, the analog signals corresponding to different grayscale values ​​are different, and the digital signals corresponding to different grayscale values ​​are all preset digital signals, and the pixel circuit is used to drive the corresponding light-emitting element to emit light according to the preset digital signal and the analog signal of the grayscale value;

[0009] Wherein, when the digital signal is the preset digital signal, the light-emitting duration of the light-emitting element in one frame is greater than the light-emitting duration of the light-emitting element in one frame when the digital signal is not the preset digital signal.

[0010] In some embodiments, the pixel circuit comprises:

[0011] A first module, configured to control the current density of the light emitting element according to the analog signal;

[0012] The second module is electrically connected to the first module and is used to control the duration of the current flowing through the light-emitting element according to the digital signal.

[0013] In some embodiments, the first module includes:

[0014] an analog signal writing module, wherein an input end of the analog signal writing module is electrically connected to an analog signal line, and the analog signal line is used to transmit the analog signal;

[0015] an analog signal driving module, electrically connected to the output end of the analog signal writing module;

[0016] The second module includes:

[0017] a digital signal writing module, wherein an input end of the digital signal writing module is electrically connected to a digital signal line, and the digital signal line is used to transmit the digital signal;

[0018] The digital signal driving module is electrically connected to the output end of the digital signal writing module, the output end of the analog signal driving module and the light emitting element.

[0019] In some embodiments, the analog signal writing module includes an analog signal writing transistor, wherein a gate of the analog signal writing transistor is electrically connected to an analog gate line, one of a source and a drain of the analog signal writing transistor is electrically connected to the analog signal line, and the other of the source and the drain of the analog signal writing transistor is electrically connected to the analog signal driving module;

[0020] The digital signal writing module includes a digital signal writing transistor, the gate of the digital signal writing transistor is electrically connected to the digital gate line, one of the source and the drain of the digital signal writing transistor is electrically connected to the digital signal line, and the other of the source and the drain of the digital signal writing transistor is electrically connected to the digital signal driving module.

[0021] In some embodiments, a frame includes a plurality of subframes;

[0022] The analog gate signal transmitted by the analog gate line is used to control the analog signal writing transistor to be turned on in the first sub-frame within a frame;

[0023] The digital gate signal transmitted by the digital gate line is used to control the digital signal writing transistor to be turned on in each sub-frame within a frame.

[0024] In some embodiments, the digital signal includes a plurality of sub-digital signals corresponding to a plurality of the sub-frames within a frame;

[0025] When the digital signal writing transistor is turned on in each sub-frame within a frame, the digital signal writing transistor transmits the corresponding sub-digital signal to the digital signal driving module, and the digital signal driving module is used to control whether to generate a current flowing through the light-emitting element according to the sub-digital signal, and to control the duration of the current flowing through the light-emitting element.

[0026] In some embodiments, the analog signal driving module includes an analog driving transistor, wherein a gate of the analog driving transistor is electrically connected to the other of a source and a drain of the analog signal writing transistor, and one of the source and the drain of the analog driving transistor is electrically connected to a first voltage line;

[0027] The digital signal driving module includes a digital driving transistor, wherein the gate of the digital driving transistor is electrically connected to the other of the source and the drain of the digital signal writing transistor, one of the source and the drain of the digital driving transistor is electrically connected to the other of the source and the drain of the analog driving transistor, and the other of the source and the drain of the digital driving transistor is electrically connected to the light-emitting element.

[0028] In some embodiments, the pixel circuit further comprises:

[0029] The switch module is electrically connected between the second module and the light emitting element, and is used to control whether a current path is formed between the second module and the light emitting element.

[0030] In some embodiments, the digital signal includes a plurality of sub-digital signals arranged in sequence, each of the sub-digital signals has a value of the first value or the second value, and each of the sub-digital signals has a different weight;

[0031] The value of the sub-digital signal is used to control the light-emitting element to emit light or extinguish, and the weight of the sub-digital signal is used to control the duration of the light-emitting element to emit light or extinguish;

[0032] When the grayscale value of the sub-pixel is less than or equal to the preset grayscale value, the value of at least one of the sub-digital signals in the two digital signals corresponding to the two different grayscale values ​​is different;

[0033] When the grayscale value of the sub-pixel is greater than the preset grayscale value, the values ​​of each of the sub-digital signals corresponding to the two digital signals corresponding to the two different grayscale values ​​are the same.

[0034] In some embodiments, the display device includes:

[0035] A data processor is used to obtain a grayscale signal of the grayscale value of the sub-pixel, and to process the grayscale signal according to the grayscale value to generate the corresponding digital signal and the corresponding analog signal.

[0036] In some embodiments, each of the pixel circuits is configured to drive the corresponding light-emitting element to emit light according to the analog signal corresponding to the grayscale value of the sub-pixel and the corresponding digital signal;

[0037] When the grayscale value of the sub-pixel is less than or equal to the preset grayscale value, the wavelength shift of the light emitted by the corresponding light-emitting element is less than or equal to 0.5 nm.

[0038] An embodiment of the present invention further provides a display method for a display device, wherein the display device includes a plurality of pixels, each pixel includes at least one sub-pixel, and the sub-pixel includes an electrically connected light-emitting element and a pixel circuit. The display method for the display device includes:

[0039] Determining whether the grayscale value of the sub-pixel is less than or equal to a preset grayscale value, where the preset grayscale value is the grayscale value corresponding to the current density of the light-emitting element when the light-emitting efficiency is maximum;

[0040] When the grayscale value of the sub-pixel is less than or equal to the preset grayscale value, executing:

[0041] Obtaining a preset analog signal and a digital signal corresponding to the grayscale value, wherein when the preset analog signal acts on the pixel circuit, the current density of the light-emitting element is the current density of the light-emitting element when the light-emitting efficiency is maximum;

[0042] The preset analog signal and the digital signal of the grayscale value are transmitted to the pixel circuit, so that the pixel circuit drives the corresponding light-emitting element to emit light.

[0043] In some embodiments, after the step of determining whether the grayscale value of the sub-pixel is less than or equal to a preset grayscale value, the method further includes:

[0044] When the grayscale value of the sub-pixel is greater than the preset grayscale value, executing:

[0045] Acquire a preset digital signal and an analog signal corresponding to the grayscale value, and when the digital signal is the preset digital signal, the light-emitting element has the longest light-emitting duration in one frame;

[0046] The preset digital signal and the analog signal of the grayscale value are transmitted to the pixel circuit, so that the pixel circuit drives the corresponding light-emitting element to emit light.

[0047] The present invention provides a display device and a display method thereof. The pixel of the display device includes at least one sub-pixel. A preset grayscale value is defined as the grayscale value corresponding to the current density of the light-emitting element when the luminous efficiency is maximum. When a preset analog signal acts on the pixel circuit, the current density of the light-emitting element is the current density of the light-emitting element when the luminous efficiency is maximum. For grayscale values ​​less than or equal to the preset grayscale value, the digital signals corresponding to different grayscale values ​​are set to different values, and the analog signals corresponding to different grayscale values ​​are all set to the preset analog signal, so that the pixel circuit is used to drive the corresponding light-emitting element to emit light according to the preset analog signal and the digital signal of the grayscale value. By achieving the maximum luminous efficiency of the light-emitting element when the grayscale value is small to reduce the power consumption of the display device, the overall power consumption of the display device when displaying a picture is reduced, which is beneficial to its application in scenarios such as virtual reality. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a diagram illustrating the architecture of a display device provided by an embodiment of the present invention.

[0049] Figure 2 and Figure 3 A circuit diagram of a pixel circuit provided by an embodiment of the present invention.

[0050] Figure 4 This is a graph showing the luminous efficiency of a light-emitting element provided by an embodiment of the present invention at different current densities.

[0051] Figure 5 A schematic diagram of multiple subframes within a frame provided by an embodiment of the present invention.

[0052] Figure 6 and Figure 7A further circuit diagram of a pixel circuit provided by an embodiment of the present invention.

[0053] Figure 8 This is a timing diagram of some signals in a pixel circuit provided by an embodiment of the present invention.

[0054] Figure 9 and Figure 10 This is a flow chart of a display method for a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0055] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0056] The terms "first" and "second" in the present invention are used to distinguish between different objects, not to describe a specific order. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or modules is not limited to the listed steps or modules, but may optionally include steps or modules not listed, or may optionally include other steps or modules inherent to the process, method, product, or apparatus.

[0057] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0058] Embodiments of the present invention provide a display device, including but not limited to the following embodiments and combinations of the following embodiments.

[0059] In some embodiments, combined Figures 1 to 3As shown, the display device 100 includes a plurality of pixels, each pixel including at least one sub-pixel Pi, and the sub-pixel Pi includes a light-emitting element 10 and a pixel circuit 20 that are electrically connected; when the grayscale value of the sub-pixel Pi is less than or equal to a preset grayscale value Ln, different digital signals Ddata corresponding to different grayscale values ​​are different, and analog signals Adata corresponding to different grayscale values ​​are all preset analog signals A0, and the pixel circuit 20 is used to drive the corresponding light-emitting element 10 to emit light according to the preset analog signal A0 and the digital signal Ddata of the grayscale value; wherein, as Figure 4 As shown, the preset grayscale value Ln is the grayscale value corresponding to the current density of the light-emitting element 10 when the luminous efficiency is maximum, and the current density of the light-emitting element 10 when the preset analog signal A0 acts on the pixel circuit 20 is the current density of the light-emitting element 10 when the luminous efficiency is maximum.

[0060] When a pixel includes one sub-pixel Pi, that is, the display device 100 includes sub-pixels Pi of the same color, only monochrome display is possible. When a pixel includes multiple sub-pixels Pi, that is, the pixel includes at least two sub-pixels Pi of different colors, multi-color display is possible. Furthermore, when a pixel includes a red sub-pixel Pi, a green sub-pixel Pi, and a blue sub-pixel Pi, a color display is possible. The light-emitting element 10 may include at least one of self-luminous devices such as an inorganic light-emitting diode and an organic light-emitting diode.

[0061] Here is for the convenience of description, Figure 1 As shown, the arrangement of multiple sub-pixels Pi along the row and column directions is used as an example for description, but the arrangement is not limited to this. The display device 100 may further include a source driver 30, a gate driver 40, a plurality of gate lines 50, and a plurality of data lines 60. Each gate line 50 is electrically connected between a corresponding output terminal of the gate driver 40 and a corresponding row of sub-pixels Pi to transmit a corresponding gate signal to the row of sub-pixels Pi. Each data line 60 is electrically connected between the source driver 30 and a corresponding column of sub-pixels Pi to transmit a corresponding data signal to the column of sub-pixels Pi.

[0062] Furthermore, the display device 100 may also include a timing controller 70 and a data processor 80. The timing controller 70 may obtain a control signal and multiple image signals corresponding to multiple frames from the front end. The timing controller 70 may generate a clock signal acting on the gate driver 40 based on the control signal. The gate driver 40 may generate the multiple gate signals based on the clock signal. The data processor 80 may obtain the image signal of each frame. Each image signal may include multiple grayscale signals corresponding to multiple sub-pixels Pi. The grayscale signal may represent the grayscale value of the sub-pixel Pi. The data processor 80 is further configured to process the grayscale signal according to the grayscale value to generate the corresponding digital signal Ddata and the corresponding analog signal Adata. The source driver 30 is configured to integrate the multiple digital signals Ddata and the corresponding multiple analog signals Adata so as to output one of the digital signal Ddata and the analog signal Adata corresponding to the sub-pixels Pi in a certain row when the sub-pixels Pi in the row are turned on, so that each of the pixel circuits 20 in the row drives the corresponding light-emitting element 10 to emit light according to the corresponding digital signal Ddata and the corresponding analog signal.

[0063] like Figure 4 As shown in FIG, the luminous efficiency curve of the light emitting element 10 at different current densities is shown. It can be observed that the luminous efficiency reaches the maximum luminous efficiency CEmax when the current density is J0. However, for display devices including small-sized display panels such as silicon-based Micro LED panels, the current density requirement of the light emitting element 10 is high when displaying higher grayscale brightness. Figure 4 As can be seen from the curve, the corresponding luminous efficiency of Micro LED decreases when the current density is higher (higher than J0). Therefore, if a higher current density is combined with different duty cycles to achieve the brightness of different gray levels of the light-emitting element 10, it is not conducive to achieving low power consumption of the overall silicon-based Micro LED panel.

[0064] Among them, the current density J0 is the current per unit area of ​​the light-emitting element 10. For each light-emitting element 10, since the size is unique, the current density of the light-emitting element 10 can be considered to be positively correlated with the current flowing through the light-emitting element 10, and the magnitude of the current is determined by the amplitude of the analog signal Adata acting on the pixel circuit 20. Combined with the above discussion, it can be seen that when the digital signal Ddata is fixed, the amplitude of the analog signal Adata is related to the grayscale value of the sub-pixel Pi, that is, the amplitude of the corresponding analog signal Adata is set according to the brightness requirement of the grayscale value.

[0065] Combined with the above analysis, we can see that due to Figure 4There is a current density J0 of the light-emitting element 10 when the luminous efficiency is maximum, that is, there is an analog signal Adata that acts on the pixel circuit 20 so that the current density of the light-emitting element 10 is the current density when the luminous efficiency is maximum. The analog signal Adata is defined as the preset analog signal A0, and the grayscale value corresponding to the preset analog signal A0 is defined as the preset grayscale value Ln.

[0066] It can be understood that this embodiment takes into account that when the preset analog signal A0 acts on the pixel circuit 20, the current density of the light-emitting element 10 can reach the current density when its luminous efficiency is maximum. Therefore, for grayscale values ​​less than or equal to the preset grayscale value Ln, since the demand for high brightness is relatively small, the analog signals Adata corresponding to different grayscale values ​​within the range are all preset analog signals A0, thereby ensuring that the light-emitting element 10 can operate at its maximum luminous efficiency CEmax, and the digital signals Ddata corresponding to different grayscale values ​​are set to different, that is, different grayscale values ​​within the range are achieved through differentiated setting of the duty cycle to achieve different luminous durations, thereby displaying different brightness corresponding to different grayscale values.

[0067] Therefore, the display device 100 of this embodiment reduces the power consumption of the display device 100 by achieving the maximum luminous efficiency of the light-emitting element 10 when displaying low grayscale, thereby reducing the overall power consumption of the display device 100 when displaying images, which is beneficial to its application in scenarios such as virtual reality.

[0068] Specifically, compared with conventional display devices, the display device 100 of this embodiment can reduce the power consumption of display driving by at least 50 mW.

[0069] In some embodiments, combined Figures 1 to 3 As shown, when the grayscale value of the sub-pixel Pi is greater than the preset grayscale value Ln, the analog signal Adata corresponding to different grayscale values ​​is different, and the digital signal Ddata corresponding to different grayscale values ​​is all the preset digital signal D0, and the pixel circuit 20 is used to drive the corresponding light-emitting element 10 to emit light according to the preset digital signal D0 and the analog signal Adata of the grayscale value; wherein, when the digital signal Ddata is the preset digital signal D0, the light-emitting duration of the light-emitting element 10 within one frame is greater than the light-emitting duration of the light-emitting element 10 within one frame when the digital signal Ddata is not the preset digital signal D0.

[0070] It can be understood that this embodiment takes into account that for grayscale values ​​greater than the preset grayscale value Ln, due to the greater demand for high brightness, the brightness corresponding to the maximum luminous efficiency CEmax cannot meet its brightness demand, and because the preset digital signal D0 is compared with other digital signals Ddata, when it acts on the pixel circuit 20, the light-emitting element 10 has the longest light-emitting time within one frame, so the digital signals Ddata corresponding to different grayscale values ​​within the range are all set to the preset digital signal D0, thereby ensuring that the light-emitting element 10 can have the longest light-emitting time within one frame, avoiding a short light-emitting time that is not conducive to achieving high brightness, and the analog signals Adata corresponding to different grayscale values ​​are set to different, that is, different grayscale values ​​within the range are achieved through differentiated settings of the analog signal Adata to achieve different current densities, thereby displaying different brightness corresponding to different grayscale values.

[0071] Therefore, when displaying high grayscale, the display device 100 of this embodiment reduces the power consumption of the display device 100 by achieving the maximum light-emitting duration of the light-emitting element 10 within one frame (that is, the above-mentioned duty cycle reaches the maximum value), thereby reducing the overall power consumption of the display device 100 when displaying the picture, which is beneficial to its application in scenarios such as virtual reality.

[0072] In some embodiments, combined Figure 2 、 Figure 3 and Figure 5 As shown, the digital signal Ddata includes a plurality of sub-digital signals arranged in sequence (for example, including 8 sub-digital signals Ddata1 to Ddata8), each of the sub-digital signals has a value of a first value or a second value (for example, 1 or 0), and each of the sub-digital signals has a different weight; wherein, the value of the sub-digital signal is used to control the light-emitting element 10 to emit light or turn off, and the weight of the sub-digital signal is used to control the duration of the light-emitting element 10 to emit light or the duration of the light-emitting element 10 to turn off.

[0073] Specifically, such as Figure 5 As shown, a frame may include multiple sub-frames corresponding to multiple sub-digital signals (for example, including 8 sub-frames F1 to F8), and each sub-frame may include a sub-blanking period t1 and a sub-light-emitting period t2 arranged in sequence. The length of the sub-light-emitting period t2 is proportional to the corresponding weight. The larger the weight, the longer the length of the sub-light-emitting period t2, and vice versa.

[0074] For example, when the value of the sub-digital signal is the first value (i.e., "1"), the light-emitting element 10 can be controlled to emit light. The greater the weight of the sub-digital signal, the longer the duration of the light-emitting element 10 will be on, and the smaller the weight of the sub-digital signal, the shorter the duration of the light-emitting element 10 will be on; when the value of the digital signal is the second value (i.e., "0"), the light-emitting element 10 can be controlled to be turned off. The greater the weight of the sub-digital signal, the longer the duration of the light-emitting element 10 will be off, and the smaller the weight of the sub-digital signal, the shorter the duration of the light-emitting element 10 will be off.

[0075] Therefore, when the analog signal Adata is fixed, the duration of the light-emitting element 10 emitting light and the duration of the light-emitting element 10 being extinguished in multiple sub-frames can be determined based on the multiple values ​​and multiple weights corresponding to the multiple sub-digital signals arranged in sequence in the digital signal Ddata, and then the total duration of the light-emitting element 10 emitting light and the total duration of the light-emitting element 10 being extinguished in the frame can be determined, so that the light-emitting element 10 presents the corresponding brightness in the frame to represent the corresponding grayscale value.

[0076] Furthermore, when the grayscale value of the sub-pixel Pi is less than or equal to the preset grayscale value Ln, the value of at least one of the sub-digital signals in the digital signal Ddata for different grayscale values ​​is different. In combination with the above discussion, it can be seen that for grayscale values ​​less than or equal to the preset grayscale value Ln, different luminous durations are achieved by differentially setting the duty cycle. Specifically, by setting the value of at least one sub-digital signal in the digital signal (e.g., at least one of the eight sub-digital signals Ddata1 to Ddata8) to be different, two different grayscale values ​​within the range are respectively in a light-emitting state and an off state within a sub-luminous period t2 of at least one sub-frame. Of course, the two grayscale values ​​can also be in different states within the sub-luminous periods t2 of more sub-frames, thereby achieving different total luminous durations within the frame (e.g., the weight ratio of the eight sub-frames F1 to F8 (i.e., the ratio of the duration of the corresponding sub-luminous periods t2) is 1:2:4:8:16:32:64:128) to represent the corresponding two grayscale values.

[0077] As can be seen from the above discussion, when the grayscale value of the sub-pixel Pi is greater than the preset grayscale value Ln, the values ​​of each of the sub-digital signals corresponding to the two digital signals Ddata corresponding to the two different grayscale values ​​are the same. That is, for grayscale values ​​greater than the preset grayscale value Ln, different luminous durations are not achieved by differentially setting the duty cycle to achieve different brightnesses for the sub-pixel Pi. Instead, the analog signal Adata is differentially set to achieve different brightnesses for the sub-pixel Pi.

[0078] In some embodiments, as Figure 2 and Figure 3As shown, the pixel circuit 20 includes: a first module 201 for controlling the current density of the light-emitting element 10 according to the analog signal Adata; and a second module 202, electrically connected to the first module 201, for controlling the duration of the current flowing through the light-emitting element 10 according to the digital signal Ddata. That is, the analog signal Adata acts on the first module 201 to generate a current flowing through the light-emitting element 10, so that the amplitude of the analog signal Adata affects the current density of the light-emitting element 10; the digital signal Ddata acts on the second module 202 to control the duration of the current flowing through the light-emitting element 10. The current density and the duration of the current flowing through the light-emitting element 10 jointly determine the duration of the light-emitting element 10.

[0079] Specifically, such as Figure 2 and Figure 3 As shown, the first module 201 includes: an analog signal writing module 2011, the input end of the analog signal writing module 2011 is electrically connected to the analog signal line, and the analog signal line is used to transmit the analog signal Adata; an analog signal driving module 2012 is electrically connected to the output end of the analog signal writing module 2011; the second module 202 includes: a digital signal writing module 2021, the input end of the digital signal writing module 2021 is electrically connected to the digital signal line, and the digital signal line is used to transmit the digital signal Ddata; a digital signal driving module 2022 is electrically connected to the output end of the digital signal writing module 2021, the output end of the analog signal driving module 2012 and the light-emitting element 10.

[0080] Furthermore, the analog signal driving module 2012, the digital signal driving module 2022 and the light-emitting element 10 can be arranged in series between a first voltage line (for loading a first voltage signal VDD) and a second voltage line (for loading a second voltage signal VSS), and the analog signal Adata is transmitted to the analog signal driving module 2012 through the analog signal writing module 2011 to control the magnitude of the current in the above-mentioned series path, and the digital signal Ddata is transmitted to the digital signal driving module 2022 through the digital signal writing module 2021 to control whether the above-mentioned series path forms a current path.

[0081] Specific, combined Figure 2 、 Figure 3 、 Figure 6 and Figure 7As shown, the analog signal writing module 2011 includes an analog signal writing transistor T8, the gate of the analog signal writing transistor T8 is electrically connected to the analog gate line (for transmitting the analog gate signal Scan'), one of the source and the drain of the analog signal writing transistor T8 is electrically connected to the analog signal line, and the other of the source and the drain of the analog signal writing transistor T8 is electrically connected to the analog signal driving module 2012; the digital signal writing module 2021 includes a digital signal writing transistor (for example, including a first digital signal writing transistor T2 and a second digital signal writing transistor T2'), the gate of the digital signal writing transistor is electrically connected to the digital gate line (for transmitting the digital gate signal Scan), one of the source and the drain of the digital signal writing transistor is electrically connected to the digital signal line, and the other of the source and the drain of the digital signal writing transistor is electrically connected to the digital signal driving module 2022.

[0082] That is, the analog gate signal Scan' controls whether the analog signal write transistor T8 is turned on to control whether the analog signal Adata is transmitted to the analog signal driving module 2012, and the digital gate signal Scan controls whether the digital signal write transistor is turned on to control whether the digital signal Ddata is transmitted to the digital signal driving module 2022.

[0083] Each of the gate lines 50 may include an analog gate line and a digital gate line.

[0084] In some embodiments, combined Figures 2 to 8 As shown, a frame includes multiple sub-frames (for example, including 8 sub-frames F1 to F8); the analog gate signal Scan' transmitted by the analog gate line (for example, multiple analog gate lines corresponding to multiple rows of sub-pixels Pi (including but not limited to the first row of sub-pixels Line1, the second row of sub-pixels Line2, the third row of sub-pixels Line3, the fourth row of sub-pixels Line4 to the Nth row of sub-pixels LineN, where N is a positive integer greater than 4) respectively output multiple analog gate signals Scan1', Scan2'...) is used to control the analog signal write transistor T8 to be turned on in the first sub-frame (i.e., F1) within a frame; the digital gate signal Scan transmitted by the digital gate line (for example, multiple digital gate signal lines corresponding to multiple rows of sub-pixels Pi respectively output multiple digital gate signals Scan1, Scan2...) is used to control the digital signal write transistor (for example, including the first digital signal write transistor T2 and the second digital signal write transistor T2') to be turned on in each of the sub-frames (F1, F2...) within a frame.

[0085] As discussed above, the digital signal Ddata includes multiple sub-digital signals (for example, including 8 sub-digital signals Ddata1 to Ddata8) corresponding to multiple sub-frames (for example, including F1 to F8) within a frame; wherein, when the digital signal write transistor is turned on in each of the sub-frames (each of F1 to F8) within a frame, the digital signal write transistor transmits the corresponding sub-digital signal (one of the 8 sub-digital signals Ddata1 to Ddata8) to the digital signal driving module 2022, and the digital signal driving module 2022 is used to control whether to generate a current flowing through the light-emitting element 10 according to the sub-digital signal, and to control the duration of the current flowing through the light-emitting element 10.

[0086] Specifically, if Figure 8 As shown, in the sub-write period Write in the first sub-frame (i.e., F1) within a frame, multiple analog gate signals Scan1', Scan2'... and multiple digital gate signals Scan1, Scan2... all include corresponding gate pulses, which control the analog signal write transistors T8 and digital signal write transistors in multiple rows of sub-pixels Pi to be turned on, thereby writing the analog signal Adata to the analog signal driving module 2012, and writing the first sub-digital signal Ddata1 in the digital signal Ddata to the digital signal driving module 2022, so that the corresponding light-emitting element 10 emits light for a corresponding length of time and to a corresponding degree, or is turned off for a corresponding length of time according to the analog signal Adata and the first sub-digital signal Ddata1.

[0087] Among them, the two sub-write periods Write corresponding to two adjacent rows of sub-pixels Pi in a frame are separated by a "Delay", the two digital gate signals corresponding to two adjacent rows of sub-pixels Pi in a frame are separated by a first sub-blanking period Off1, and the light-emitting period Emitting of the current sub-frame and the sub-write period Write of the next sub-frame of the same row of sub-pixels Pi are separated by a second sub-blanking period Off2.

[0088] Furthermore, in the sub-write period Write in multiple sub-frames starting from the second sub-frame (i.e., F2) within a frame, multiple analog gate signals Scan1', Scan2'... are all corresponding invalid potentials, and the analog signal write transistor T8 is no longer turned off but remains turned on. The analog signal driving module 2012 is continuously acted upon by the unique analog signal Adata corresponding to the frame, and multiple digital gate signals Scan1, Scan2... all include corresponding gate pulses to control the digital signal write transistors in multiple rows of sub-pixels Pi to be turned on in each subsequent sub-frame, so that each digital signal driving module 2022 is acted upon by the corresponding sub-digital signal in each subsequent sub-frame, and thus each light-emitting element 10 emits light for a corresponding duration and to a corresponding degree or turns off for a corresponding duration in each sub-frame according to the same analog signal Adata and the sub-digital signal corresponding to each sub-frame.

[0089] Furthermore, in the next frame, the same driving method as above is also adopted.

[0090] In some embodiments, combined Figures 2 to 7 As shown, the analog signal driving module 2012 includes an analog driving transistor T7, the gate of the analog driving transistor T7 is electrically connected to the other of the source and the drain of the analog signal writing transistor T8, and one of the source and the drain of the analog driving transistor T7 is electrically connected to the above-mentioned first voltage line (transmitting the first voltage signal VDD); the digital signal driving module 2022 includes a digital driving transistor T1, the gate of the digital driving transistor T1 is electrically connected to the other of the source and the drain of the digital signal writing transistor (for example, including the first digital signal writing transistor T2 and the second digital signal writing transistor T2'), one of the source and the drain of the digital driving transistor T1 is electrically connected to the other of the source and the drain of the analog driving transistor T7, and the other of the source and the drain of the digital driving transistor T1 is electrically connected to the light-emitting element 10.

[0091] In which, within a subframe, the analog signal Adata is written to the gate of the analog driving transistor T7 through the analog signal writing transistor T8, thereby controlling the analog driving transistor T7 to be turned on, and the digital signal Ddata is written to the digital driving transistor T1 through the digital signal writing transistor, thereby controlling the digital driving transistor T1 to be turned on or off. When the digital driving transistor T1 is turned on, a current path is formed between the first voltage line and the second voltage line. The analog signal Adata and the first voltage signal VDD control the voltage between the gate and one of the source and drain of the analog driving transistor T7, thereby controlling the magnitude of the current flowing through the light-emitting element 10, and further controlling the brightness of the light-emitting element 10.

[0092] Of course, in this subframe, when the digital driving transistor T1 is turned off, no current path is formed between the first voltage line and the second voltage line, and the light emitting element 10 is turned off.

[0093] It can be understood that when the grayscale value of the sub-pixel Pi is less than or equal to the preset grayscale value Ln, since the analog signals Adata corresponding to different grayscale values ​​are all preset analog signals A0, that is, the magnitude of the current flowing through the current path formed between the first voltage line and the second voltage line is relatively stable, it can be considered that the wavelength offset of the light emitted by the light-emitting element 10 under the action of multiple grayscale values ​​within this range (less than or equal to the preset grayscale value Ln) is small (less than or equal to less than 0.5nm).

[0094] Further, combined Figure 2 、 Figure 3 、 Figure 6 and Figure 7 As shown, the digital signal write transistor includes a first digital signal write transistor T2 and a second digital signal write transistor T2', the digital signal driving module 2022 also includes a first storage transistor T3 and a second storage transistor T5 electrically connected to the first digital signal write transistor T2, and a third storage transistor T4 and a fourth storage transistor T6 electrically connected to the second digital signal write transistor T2', and the analog signal writing module 2011 also includes a storage capacitor Cst connected between the first voltage line and the gate of the analog driving transistor T7.

[0095] The specific connection relationship of the above devices refers to Figure 6 and Figure 7 One of the source and the drain of the first storage transistor T3 and the third storage transistor T4 may also be electrically connected to the second voltage line.

[0096] Among them, the digital driving transistor T1, the second storage transistor T5, the fourth storage transistor T6, and the analog driving transistor T7 can be P-type transistors, and the first digital signal writing transistor T2, the second digital signal writing transistor T2', the first storage transistor T3, the third storage transistor T4, and the analog signal writing transistor T8 can be N-type transistors.

[0097] Each data line 60 may include a first data line for transmitting a digital signal Ddata and a second data line for transmitting an inverted digital signal Ddata′. The digital signal Ddata and the inverted digital signal Ddata′ have opposite phases.

[0098] for Figure 7 and Figure 8 The following analysis can be made:

[0099] In a sub-frame, for example, the value of the sub-digital signal corresponding to the digital signal Ddata is a first value (i.e., "1"), which is transmitted to the gates of the first storage transistor T3 and the second storage transistor T5 through the first digital signal writing transistor T2, so that the first storage transistor T3 is turned on and the second storage transistor T5 is turned off, so that the second voltage signal VSS is transmitted to the gate of the digital driving transistor T1 to control the digital driving transistor T1 to be turned on;

[0100] At the same time, the sub-digital signal corresponding to the inverted digital signal Ddata' takes the second value (i.e., "0") and is transmitted to the gates of the third storage transistor T4 and the fourth storage transistor T6 via the second digital signal writing transistor T2', thereby turning on the fourth storage transistor T6 and turning off the third storage transistor T4, so that the first voltage signal VDD is transmitted to the gate of the first storage transistor T3 to control the first storage transistor T3 to turn on.

[0101] For another example, when the value of the sub-digital signal corresponding to the digital signal Ddata is the second value (ie, “0”), it can be seen from the same analysis that the digital driving transistor T1 is turned off.

[0102] In some embodiments, combined Figure 3 and Figure 7 As shown, the pixel circuit 20 further includes: a switch module 203, electrically connected between the second module 202 and the light-emitting element 10, for controlling whether a current path is formed between the second module 202 and the light-emitting element 10. Specifically, the switch module 203 includes a switch transistor T9, the gate of which is loaded with a switch signal PWM. The gates of the switch transistors T9 of different pixel circuits 20 are all loaded with the same switch signal PWM. The switch transistors T9 of the pixel circuits 20 controlled by the switch signal PWM are simultaneously turned on or off to control whether a current path is formed between the first voltage line and the second voltage line in multiple sub-pixels Pi. That is, the switch signal PWM can control the entire display area to display or turn off the image.

[0103] Embodiments of the present invention provide a display method for a display device, including but not limited to the following embodiments and combinations of the following embodiments.

[0104] In some embodiments, as Figure 9 As shown, the display method of the display device includes but is not limited to the following steps and combinations of the following steps:

[0105] S1, determining whether the grayscale value of the sub-pixel is less than or equal to a preset grayscale value, where the preset grayscale value is the grayscale value corresponding to the current density of the light-emitting element when the light-emitting efficiency is maximum;

[0106] When the grayscale value of the sub-pixel is less than or equal to the preset grayscale value, executing:

[0107] S2, obtaining a preset analog signal and a digital signal corresponding to the grayscale value, wherein when the preset analog signal acts on the pixel circuit, the current density of the light-emitting element is the current density when the light-emitting element has the maximum luminous efficiency;

[0108] S3, transmitting the preset analog signal and the digital signal of the grayscale value to the pixel circuit, so that the pixel circuit drives the corresponding light-emitting element to emit light.

[0109] In some embodiments, as Figure 10 As shown, step S1 further includes but is not limited to the following steps and combinations of the following steps:

[0110] When the grayscale value of the sub-pixel is greater than the preset grayscale value, executing:

[0111] S4, obtaining a preset digital signal and an analog signal corresponding to the grayscale value, wherein when the digital signal is the preset digital signal, the light emitting element has the longest light emitting duration in one frame;

[0112] S5, transmitting the preset digital signal and the analog signal of the grayscale value to the pixel circuit, so that the pixel circuit drives the corresponding light-emitting element to emit light.

[0113] The definitions of the grayscale value of the sub-pixel Pi, the preset grayscale value, the current density, the current density of the light-emitting element 10 when the light-emitting efficiency is maximum, etc. can refer to the relevant discussion above.

[0114] Table 1

[0115] Grayscale value Ddata Adata L0 00000000 A0 …… …… A0 Ln 11111111 A0 …… 11111111 …… L255 11111111 Am

[0116] As shown in Table 1, the minimum grayscale value is L0 (value 0) and the maximum grayscale value is L255 (value 255) as an example, that is, the grayscale value includes 256 levels.

[0117] The following methods can be used to formulate Table 1:

[0118] according to Figure 4 The graph of the luminous efficiency of the light-emitting element 10 at different current densities is shown, and the luminous efficiency of the light-emitting element 10 is determined to be the current density J0 at the maximum luminous efficiency CEmax (the eight sub-digital signals Ddata1 to Ddata8 in the digital signal Ddata corresponding to this process are all first values, that is, the digital signal Ddata is 11111111, and the corresponding luminous time proportion N% can be close to 100%);

[0119] Calculate the grayscale value (i.e., the preset grayscale value Ln) and the brightness L1 of the light-emitting element 10 at the above current density J0, where L1 = CEmax × J0 × N% × A2 / A1, where A2 is the effective light-emitting area of ​​the light-emitting element 10, and A1 is the area of ​​the corresponding sub-pixel Pi. The brightness of the sub-pixel Pi at the maximum grayscale value L255 is obtained as L2. The requirement is Gamma 2.2. According to (Ln / 255) 2.2 = L1 / L2, the grayscale value Ln corresponding to the brightness L1 of the light emitting element 10 can be calculated;

[0120] Determine the analog signal Adata (i.e., the preset analog signal A0) corresponding to the current (J0×A2) flowing through the light emitting element 10 according to the output characteristic curve of the analog driving transistor T7;

[0121] For grayscale values ​​less than or equal to the preset grayscale value, the corresponding multiple digital signals Ddata are all preset analog signals A0 corresponding to the maximum luminous efficiency CEmax. The light-emitting time ratio is adjusted (i.e., the digital signal Ddata is set differently) to correspond to different grayscale values. That is, the digital signals Ddata for grayscale values ​​L0 to Ln can be 00000000, 00000001, and finally 111111111, that is, gradually increasing from decimal "0" to decimal "255". The number of decimal divisions in the middle should be equal to the number of integers between the grayscale value L0 and the grayscale value Ln.

[0122] For grayscale values ​​greater than the preset grayscale value, the corresponding multiple digital signals Ddata are all their maximum value "11111111", and the magnitude of the current flowing through the light-emitting element 10 is adjusted (that is, the analog signal Adata is set differentially) to correspond to different grayscale values, that is, the analog signal Adata of the grayscale value Ln to the grayscale value L255 can be A0 to Am in sequence, which gradually increases.

[0123] According to steps S2 to S3, for grayscale values ​​less than or equal to the preset grayscale value Ln, since the demand for high brightness is relatively small, the analog signal Adata corresponding to different grayscale values ​​within the range is the preset analog signal A0, thereby ensuring that the light-emitting element 10 can operate at its maximum luminous efficiency CEmax, and the digital signal Ddata corresponding to different grayscale values ​​is set to be different, that is, different grayscale values ​​within the range are achieved by different duty cycle settings to achieve different luminous durations, thereby displaying different brightness corresponding to different grayscale values.

[0124] According to steps S4 to S5, for grayscale values ​​greater than the preset grayscale value Ln, due to the greater demand for high brightness, the brightness corresponding to the maximum luminous efficiency CEmax cannot meet its brightness demand, and because the preset digital signal D0 has the longest luminous duration of the light-emitting element 10 within one frame when acting on the pixel circuit 20 compared with other digital signals Ddata, the digital signals Ddata corresponding to different grayscale values ​​within the range are all set to the preset digital signal D0, thereby ensuring that the light-emitting element 10 can have the longest luminous duration within one frame, avoiding a short luminous duration that is not conducive to achieving high brightness, and the analog signals Adata corresponding to different grayscale values ​​are set to different, that is, different grayscale values ​​within the range are achieved through differentiated settings of the analog signal Adata to achieve different current densities, thereby displaying different brightness corresponding to different grayscale values.

[0125] The display device and display method provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present invention. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display device, characterized in that: comprising a plurality of pixels, each pixel comprising at least one sub-pixel, each sub-pixel comprising a light-emitting element and a pixel circuit electrically connected; When the grayscale value of the sub-pixel is less than or equal to a preset grayscale value, different grayscale values ​​correspond to different digital signals, and the analog signals corresponding to different grayscale values ​​are all preset analog signals, and the pixel circuit is used to drive the corresponding light-emitting element to emit light according to the preset analog signal and the digital signal of the grayscale value; Among them, the preset grayscale value is the grayscale value corresponding to the current density of the light-emitting element when the luminous efficiency is maximum. When the preset analog signal acts on the pixel circuit, the current density of the light-emitting element is the current density of the light-emitting element when the luminous efficiency is maximum.

2. The display device according to claim 1, wherein When the grayscale value of the sub-pixel is greater than the preset grayscale value, the analog signals corresponding to different grayscale values ​​are different, and the digital signals corresponding to different grayscale values ​​are all preset digital signals, and the pixel circuit is used to drive the corresponding light-emitting element to emit light according to the preset digital signal and the analog signal of the grayscale value; Wherein, when the digital signal is the preset digital signal, the light-emitting duration of the light-emitting element in one frame is greater than the light-emitting duration of the light-emitting element in one frame when the digital signal is not the preset digital signal.

3. The display device according to claim 2, wherein: The pixel circuit comprises: A first module, configured to control the current density of the light emitting element according to the analog signal; The second module is electrically connected to the first module and is used to control the duration of the current flowing through the light-emitting element according to the digital signal.

4. The display device according to claim 3, wherein: The first module includes: an analog signal writing module, wherein an input end of the analog signal writing module is electrically connected to an analog signal line, and the analog signal line is used to transmit the analog signal; an analog signal driving module, electrically connected to the output end of the analog signal writing module; The second module includes: a digital signal writing module, wherein an input end of the digital signal writing module is electrically connected to a digital signal line, and the digital signal line is used to transmit the digital signal; The digital signal driving module is electrically connected to the output end of the digital signal writing module, the output end of the analog signal driving module and the light emitting element.

5. The display device according to claim 4, wherein: The analog signal writing module includes an analog signal writing transistor, wherein the gate of the analog signal writing transistor is electrically connected to the analog gate line, one of the source and the drain of the analog signal writing transistor is electrically connected to the analog signal line, and the other of the source and the drain of the analog signal writing transistor is electrically connected to the analog signal driving module; The digital signal writing module includes a digital signal writing transistor, the gate of the digital signal writing transistor is electrically connected to the digital gate line, one of the source and the drain of the digital signal writing transistor is electrically connected to the digital signal line, and the other of the source and the drain of the digital signal writing transistor is electrically connected to the digital signal driving module.

6. The display device according to claim 5, wherein: A frame includes multiple subframes; The analog gate signal transmitted by the analog gate line is used to control the analog signal writing transistor to be turned on in the first sub-frame within a frame; The digital gate signal transmitted by the digital gate line is used to control the digital signal writing transistor to be turned on in each sub-frame within a frame.

7. The display device according to claim 6, wherein: The digital signal includes a plurality of sub-digital signals corresponding to a plurality of the sub-frames within a frame; When the digital signal writing transistor is turned on in each sub-frame within a frame, the digital signal writing transistor transmits the corresponding sub-digital signal to the digital signal driving module, and the digital signal driving module is used to control whether to generate a current flowing through the light-emitting element according to the sub-digital signal, and to control the duration of the current flowing through the light-emitting element.

8. The display device according to any one of claims 5 to 7, characterized in that The analog signal driving module includes an analog driving transistor, wherein a gate of the analog driving transistor is electrically connected to the other of a source and a drain of the analog signal writing transistor, and one of the source and the drain of the analog driving transistor is electrically connected to a first voltage line; The digital signal driving module includes a digital driving transistor, wherein the gate of the digital driving transistor is electrically connected to the other of the source and the drain of the digital signal writing transistor, one of the source and the drain of the digital driving transistor is electrically connected to the other of the source and the drain of the analog driving transistor, and the other of the source and the drain of the digital driving transistor is electrically connected to the light-emitting element.

9. The display device according to claim 3, wherein: The pixel circuit further includes: The switch module is electrically connected between the second module and the light emitting element, and is used to control whether a current path is formed between the second module and the light emitting element.

10. The display device according to any one of claims 2 to 7 and 9, characterized in that: The digital signal includes a plurality of sub-digital signals arranged in sequence, each of the sub-digital signals has a value of the first value or the second value, and each of the sub-digital signals has a different weight; The value of the sub-digital signal is used to control the light-emitting element to emit light or extinguish, and the weight of the sub-digital signal is used to control the duration of the light-emitting element to emit light or extinguish; When the grayscale value of the sub-pixel is less than or equal to the preset grayscale value, the value of at least one of the sub-digital signals in the two digital signals corresponding to the two different grayscale values ​​is different; When the grayscale value of the sub-pixel is greater than the preset grayscale value, the values ​​of each of the sub-digital signals corresponding to the two digital signals corresponding to the two different grayscale values ​​are the same.

11. The display device according to any one of claims 1 to 7 and 9, characterized in that: include: A data processor is used to obtain a grayscale signal of the grayscale value of the sub-pixel, and to process the grayscale signal according to the grayscale value to generate the corresponding digital signal and the corresponding analog signal.

12. The display device according to claim 11 , wherein each pixel circuit is configured to drive the corresponding light-emitting element to emit light according to the analog signal corresponding to the grayscale value of the sub-pixel and the corresponding digital signal; in, When the grayscale value of the sub-pixel is less than or equal to the preset grayscale value, the wavelength shift of the light emitted by the corresponding light-emitting element is less than or equal to 0.5 nm.

13. A display method of a display device, characterized in that: The display device includes a plurality of pixels, each pixel includes at least one sub-pixel, and each sub-pixel includes a light-emitting element and a pixel circuit that are electrically connected. The display method of the display device includes: Determining whether the grayscale value of the sub-pixel is less than or equal to a preset grayscale value, where the preset grayscale value is the grayscale value corresponding to the current density of the light-emitting element when the light-emitting efficiency is maximum; When the grayscale value of the sub-pixel is less than or equal to the preset grayscale value, executing: Obtaining a preset analog signal and a digital signal corresponding to the grayscale value, wherein when the preset analog signal acts on the pixel circuit, the current density of the light-emitting element is the current density of the light-emitting element when the light-emitting efficiency is maximum; The preset analog signal and the digital signal of the grayscale value are transmitted to the pixel circuit, so that the pixel circuit drives the corresponding light-emitting element to emit light.

14. The display method of the display device according to claim 13, wherein: After the step of determining whether the grayscale value of the sub-pixel is less than or equal to the preset grayscale value, the method further includes: When the grayscale value of the sub-pixel is greater than the preset grayscale value, executing: Acquire a preset digital signal and an analog signal corresponding to the grayscale value, and when the digital signal is the preset digital signal, the light-emitting element has the longest light-emitting duration in one frame; The preset digital signal and the analog signal of the grayscale value are transmitted to the pixel circuit, so that the pixel circuit drives the corresponding light-emitting element to emit light.

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