Display panel and display device

Abstract

The embodiment of the invention provides a display panel and a display device. The display panel comprises a first light-emitting device and a second light-emitting device which are different in light emitting color, the first pixel circuit is connected with the first light-emitting device, and the second pixel circuit is connected with the second light-emitting device; one frame of the display panel comprises N subframes, N is an integer, and N is greater than or equal to 2; the N sub-frames corresponding to the pixel circuit comprise the first sub-frame to the Nth sub-frame which are ranked from short to long according to the duration of the light emitting stage; the light-emitting device displays the gray scale level according to a subframe instantaneous brightness distribution rule; the duration of the light-emitting stage of the first pixel circuit in the corresponding first sub-frame is t11, the duration of the light-emitting stage of the first pixel circuit in the corresponding second sub-frame is t12, the duration of the light-emitting stage of the second pixel circuit in the corresponding first sub-frame is t21, and the duration of the light-emitting stage of the second pixel circuit in the corresponding second sub-frame is t22; t < 11 > / t < 12 > gt; t21 / t22. When the display panel works in a relatively high brightness mode, the first light-emitting device has high light-emitting efficiency, and the power consumption of the display panel can be reduced.

Description

Technical Field

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

[0002] Light-emitting diodes (LEDs) are widely used in the display field. Micro-LEDs and Mini-LEDs, for example, are used as display pixels. They offer high luminous efficiency, high brightness, a wide color gamut, and low power consumption. Color displays require red, green, and blue LEDs. Due to differences in luminous efficiency between devices of different colors, improving the efficiency of these devices and reducing power consumption in these applications has become a key research topic. Summary of the Invention

[0003] Embodiments of the present invention provide a display panel and a display device to solve the technical problems of improving the luminous efficiency of a light-emitting device and reducing the power consumption of a display panel.

[0004] In a first aspect, an embodiment of the present invention provides a display panel, comprising a light-emitting device and a pixel circuit, wherein the light-emitting device comprises a first light-emitting device and a second light-emitting device having different luminous colors, and the pixel circuit comprises a first pixel circuit and a second pixel circuit, wherein the first pixel circuit is connected to the first light-emitting device and the second pixel circuit is connected to the second light-emitting device; One frame of the display panel includes N subframes, where N is an integer and N≥2; the operation of the pixel circuit in the subframe includes a light-emitting phase, and the N subframes corresponding to the pixel circuit include subframes 1 to N, which are sorted from shortest to longest in terms of the duration of the light-emitting phase; the light-emitting device displays grayscale levels according to a subframe instantaneous brightness allocation rule, and the subframe instantaneous brightness allocation rule includes: the grayscale displayed by the light-emitting device increases as its instantaneous brightness in the subframe increases, and after the light-emitting device reaches maximum instantaneous brightness in the current subframe, it is allocated to emit light in the next subframe, and the duration of the light-emitting phase in the next subframe is not less than the duration of the light-emitting phase in the current subframe; The duration of the light emitting phase of the first pixel circuit in its corresponding first subframe is t 11 , the duration of the light-emitting phase in the corresponding second subframe is t 12 The duration of the light emitting phase of the second pixel circuit in its corresponding first subframe is t 21 , the duration of the light-emitting phase in the corresponding second subframe is t 22 ; t 11 / t 12 >t 21 / t 22 .

[0005] In a second aspect, based on the same inventive concept, an embodiment of the present invention further provides a display device, comprising the display panel provided by any embodiment of the present invention.

[0006] The display panel and display device provided by the embodiment of the present invention have the following beneficial effects: the embodiment of the present invention sets a first light-emitting device and a second light-emitting device with different luminous colors to be connected to a first pixel circuit and a second pixel circuit respectively, and one frame of the display panel includes N subframes, and the light-emitting phase durations of the first pixel circuit and the second pixel circuit in the subframe can be controlled independently of each other. The first pixel circuit and the second pixel circuit respectively correspond to the 1st subframe to the Nth subframe sorted from short to long in terms of the light-emitting phase duration, and the first light-emitting device and the second light-emitting device respectively display grayscale levels according to the subframe instantaneous brightness distribution rule. And set t 11 / t 12 >t 21 / t 22 , the light emitting phase duration t of the first subframe corresponding to the first pixel circuit 11 The setting is relatively longer. When the first light-emitting device allocates grayscale levels according to the sub-frame instantaneous brightness allocation rule, more grayscales can be allocated in the first sub-frame where the first pixel circuit is working, so that the starting grayscale of the second sub-frame is higher. When the first light-emitting device emits light in both the first sub-frame and the second sub-frame, it has reached the maximum instantaneous brightness in the first sub-frame, which can compensate for the low efficiency and non-uniformity caused by the low current in the initial stage of the second sub-frame to a certain extent, and the current density in the second sub-frame will also increase quickly to ensure the luminous efficiency of the first light-emitting device. When the display panel operates in a relatively high brightness mode, it can ensure that the first light-emitting device has high luminous efficiency, reduce the power consumption of the display panel, and improve display uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0008] Figure 1 A schematic diagram of a pixel circuit provided by an embodiment of the present invention; Figure 2 A schematic diagram of another pixel circuit provided by an embodiment of the present invention; Figure 3 Schematic diagram of the distribution of instantaneous brightness and grayscale levels of subframes; Figure 4A A schematic diagram of a display panel provided by an embodiment of the present invention; Figure 4B A schematic diagram of another display panel provided by an embodiment of the present invention; Figure 5 A schematic diagram of a pixel circuit in a subframe during a light-emitting phase according to an embodiment of the present invention; Figure 6 is a current efficiency curve of a light emitting device; Figure 7 Schematic diagram of the grayscale distribution principle of the first light-emitting device in an embodiment of the present invention; Figure 8 A schematic diagram of another pixel circuit in a light-emitting stage in a subframe provided by an embodiment of the present invention; Figure 9 A schematic diagram of another pixel circuit in a light-emitting stage in a subframe provided by an embodiment of the present invention; Figure 10 A schematic diagram of another pixel circuit in a light-emitting stage in a subframe provided by an embodiment of the present invention; Figure 11 A schematic diagram of another pixel circuit in a light-emitting stage in a subframe provided by an embodiment of the present invention; Figure 12 A schematic diagram of another pixel circuit in a light-emitting stage in a subframe provided by an embodiment of the present invention; Figure 13 A timing diagram of a light-emitting control signal provided by an embodiment of the present invention; Figure 14 Another timing diagram of light-emitting control signals provided by an embodiment of the present invention; Figure 15 A schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0009] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0010] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "an", "the" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0011] An embodiment of the present invention provides a display panel, in which a first light-emitting device and a second light-emitting device with different luminous colors are connected to different pixel circuits. The luminous durations of the two light-emitting devices can be set differently during operation, thereby compensating for the difference in luminous efficiency of the two light-emitting devices. One frame of the display panel includes N subframes, and both light-emitting devices are set to display grayscale levels according to the subframe instantaneous brightness distribution rules, so that the light-emitting devices have higher efficiency and uniformity and avoid the shift of the emission wavelength. In addition, the ratio of the luminous phase duration of the first subframe and the luminous phase duration of the second subframe corresponding to the two pixel circuits is set differently, so that the light-emitting devices work at a high current density as much as possible, thereby improving the luminous efficiency and reducing the power consumption of the display panel. The above is the main technical idea of the present invention, and the present invention is explained in the following in the form of specific embodiments.

[0012] The display panel provided by the embodiment of the present invention includes a light-emitting device and a pixel circuit. The light-emitting device may be a Micro-LED or Mini-LED. The pixel circuit is electrically connected to the light-emitting device and is used to drive the light-emitting device to emit light.

[0013] Figure 1 Schematic diagram of a pixel circuit provided by an embodiment of the present invention. Figure 1 As shown, the pixel circuit includes at least a driving transistor Tm, a data writing transistor M1, a light-emission control transistor M2, and a storage capacitor Cst. The pixel circuit operates in a writing phase and a light-emission phase. During the writing phase, the data writing transistor M1 turns on under the control of a scan signal Scan to write the data voltage Data to the gate of the driving transistor Tm. During the light-emission phase, when the light-emission control transistor M2 turns on under the control of a light-emission control signal Emit, the driving transistor Tm generates a driving current under the control of its gate voltage and supplies the driving current to the light-emitting device PD. Driving the light-emitting device PD to emit light also requires setting a first power supply voltage Pvdd and a second power supply voltage Pvee. Optionally, the first power supply voltage Pvdd is a positive power supply voltage, and the second power supply voltage Pvee is a negative power supply voltage. The effective pulse width of the light-emission control signal Emit affects the duration of the light-emission phase, which in turn affects the actual light-emission time of the light-emitting device PD. By adjusting the effective pulse width of the light-emission control signal Emit, the duration of the light-emission phase can be controlled.

[0014] Figure 2 FIG. 1 is another schematic diagram of a pixel circuit provided by an embodiment of the present invention. Figure 2As shown, the pixel circuit includes a driving transistor Tm, a data writing transistor M1, a gate reset transistor M3, a threshold compensation transistor M4, an electrode reset transistor M7, a first emission control transistor M5, a second emission control transistor M6, and a storage capacitor Cst. The operation process of the pixel circuit includes at least a reset phase, a write phase, and a light-emitting phase. During the reset phase, the gate reset transistor M3 is turned on under the control of the second scan signal S2 to write the reset signal Vref to the gate of the driving transistor Tm, and the electrode reset transistor M7 is turned on under the control of the second scan signal S2 to write the reset signal Vref to the electrode of the light-emitting device PD. During the write phase, the data writing transistor M1 and the threshold compensation transistor M4 are turned on under the control of the first scan signal S1 to write the data voltage Data to the gate of the driving transistor Tm and perform self-test and compensation on the threshold voltage of the driving transistor Tm. During the light-emitting phase, the first emission control transistor M5 and the second emission control transistor M6 are turned on under the control of the emission control signal Emit. The driving transistor Tm generates a drive current under the control of its gate voltage and supplies the drive current to the light-emitting device PD. The effective pulse width of the light emitting control signal Emit affects the duration of the light emitting phase, which in turn affects the actual light emitting time of the light emitting device PD. By adjusting the effective pulse width of the light emitting control signal Emit, the duration of the light emitting phase can be controlled.

[0015] Figure 1 and Figure 2 The pixel circuit is only for schematic representation and is not intended to limit the present invention. The pixel circuit in the display panel provided by the present invention can be any circuit that can adjust the duration of the light-emitting phase during the operation of the pixel circuit. Figure 2 For example, the light-emission control transistors (including the first light-emission control transistor M5 and the second light-emission control transistor M6) are connected in series with the driving transistor Tm. During the light-emission phase, the duration of the light-emission phase can be regulated by controlling the on-time of the light-emission control transistors. In other words, by controlling the active level duration of the light-emission control signal Emit, the duration of the light-emission phase can be controlled, thereby controlling the light-emission duration of the light-emitting device PD.

[0016] In an embodiment of the present invention, a frame of a display panel includes N subframes, where N is an integer and N≥2. A frame is a frame in which a display panel displays a picture, and a frame includes subframes. A pixel circuit includes at least a writing phase and a light-emitting phase in a subframe. The display panel includes multiple scan lines (providing scan signals) and multiple light-emitting control lines (providing light-emitting control signals). A scan line connects multiple pixel circuits, and a light-emitting control line connects multiple pixel circuits. The scan line and the light-emitting control line drive the pixel circuit simultaneously, with the scan line controlling the writing phase and the light-emitting control line controlling the light-emitting phase. In a subframe, the multiple scan lines of the display panel sequentially output enable signals from top to bottom, and the multiple light-emitting control lines sequentially output enable signals from top to bottom. When a frame includes two or more subframes, in each subframe, the multiple scan lines of the display panel sequentially output enable signals from top to bottom, and the multiple light-emitting control lines sequentially output enable signals from top to bottom. For example, when two subframes are included, for a light-emitting device PD, the brightness in the two subframes is superimposed to form the grayscale required to be displayed in one picture, and the images displayed by the display panel in the two subframes are superimposed to form a complete picture required to be displayed.

[0017] The operation of the pixel circuit in a subframe includes a light-emitting phase. The N subframes corresponding to the pixel circuit include subframes 1 to N, sorted from shortest to longest in terms of light-emitting phase duration. The light-emitting device PD displays grayscale levels according to a subframe instantaneous brightness allocation rule. The subframe instantaneous brightness allocation rule includes: the grayscale displayed by the light-emitting device PD increases as its instantaneous brightness increases in the subframe. After the light-emitting device PD reaches maximum instantaneous brightness in the current subframe, it is allocated to emit light in the next subframe. The duration of the light-emitting phase in the next subframe is not less than the duration of the light-emitting phase in the current subframe. The instantaneous brightness of the light-emitting device PD in the subframe is related to the data voltage Data written during the write phase. The data voltage Data affects the drive current generated by the driver transistor during the light-emitting phase, and the drive current affects the instantaneous brightness. The brightness of the light-emitting device PD in the subframe is related to the instantaneous brightness and the light-emitting duration. When the instantaneous brightness is fixed, the longer the light-emitting duration, the greater the brightness of the light-emitting device PD in the subframe. When one frame includes two or more sub-frames, the superposition of the light emitting brightness of the light emitting device PD in the two or more sub-frames is the grayscale level displayed in one frame.

[0018] Taking a frame including three subframes as an example, the instantaneous brightness distribution rule of the subframes is explained. Figure 3 Schematic diagram of the distribution of instantaneous brightness and grayscale levels of subframes. Figure 3 The horizontal axis represents time and the vertical axis represents brightness. Figure 3 As shown, the display process of a picture Frame, that is, a frame includes three sub-frames, namely sub-frame Z1, sub-frame Z2 and sub-frame Z3. Figure 3The filling width of the middle graphic indicates the light emitting duration of the light emitting device PD in the subframe, and also indicates the duration of the light emitting phase in the subframe. Figure 3 The duration of the lighting phases of subframe Z1, subframe Z2 and subframe Z3 gradually increases. Figure 3 The grayscale levels displayed by the light-emitting devices PD gradually increase from left to right in the image. When displaying a low grayscale, the light-emitting devices PD initially emit light only in subframe Z1. The duration of the light-emitting phase in subframe Z1 is fixed. As the instantaneous brightness of the light-emitting devices PD in subframe Z1 increases, the displayed grayscale level increases. This change in instantaneous brightness is controlled by the data voltage Data written into subframe Z1. When the light-emitting devices PD reach their maximum instantaneous brightness in subframe Z1, the grayscale display within a single subframe reaches its limit. To display a higher grayscale level, the light-emitting devices PD are allocated to continue emitting light in subframe Z2. That is, when displaying a medium grayscale, the light-emitting devices PD emit light in both subframes Z1 and Z2, and in subframe Z1, the light-emitting devices PD reach their maximum instantaneous brightness within that subframe. When the light-emitting device PD reaches its maximum instantaneous brightness in subframe Z1 and also reaches its maximum instantaneous brightness in subframe Z2, the grayscale display using the two subframes reaches its limit. The light-emitting device PD is then assigned to continue emitting light in subframe Z3 to increase the displayable grayscale level. For example, when displaying a high grayscale level, the light-emitting device PD emits light in subframes Z1, Z2, and Z3. In subframe Z1, the light-emitting device PD reaches its maximum instantaneous brightness within that subframe, and in subframe Z2, the light-emitting device PD reaches its maximum instantaneous brightness within that subframe. When the light-emitting device PD reaches its maximum instantaneous brightness within all three subframes, the light-emitting device PD can display the maximum grayscale level.

[0019] The above allocation rules, combined with the data voltage range and the number of grayscale levels to be displayed, are used to allocate the data voltages required to be written to the light-emitting device PD in each subframe when displaying each grayscale level. For example, it is determined that controlling the light-emitting device PD to emit in subframe Z1 can display grayscales from 0 to 70, controlling the light-emitting device PD to emit in subframes Z1 and Z2 can display grayscales from 71 to 200, and controlling the light-emitting device PD to emit in all three subframes can display grayscales from 201 to 255. When displaying low grayscale levels, light is preferentially emitted in subframes with shorter light-emitting phases. As the displayed grayscale level increases, light is emitted in subframes with longer light-emitting phases only when the subframes with shorter light-emitting phases reach maximum instantaneous brightness. When the grayscale level is low, the light-emitting device PD is illuminated only during the subframes with the shortest light-emitting phase. The shorter the light-emitting duration of the light-emitting device PD, the greater the current density, and the better the performance of the light-emitting device PD. Adopting the sub-frame instantaneous brightness distribution rule to distribute the light-emitting devices to display different grayscale levels can improve the luminous efficiency of the light-emitting devices, avoid the deviation of the emission wavelength, and improve the uniformity.

[0020] It should be noted that the instantaneous brightness of a light-emitting device generally refers to its brightness measured within microseconds. The instantaneous brightness of a light-emitting device corresponds to the data voltage. The data voltage range that the display driver chip in a finished electronic device can provide is fixed; that is, the data voltage written to the pixel circuit has a maximum and minimum value. The maximum instantaneous brightness of a light-emitting device within a subframe generally refers to the data voltage's extreme value that maximizes the brightness of the light-emitting device in that subframe. The instantaneous brightness of a light-emitting device PD in each subframe needs to be allocated based on the grayscale level, and this brightness is related to the data voltage. However, since grayscale levels are discontinuous, this allocation may result in differences in the data voltage at which the light-emitting device PD achieves its maximum instantaneous brightness in different subframes, resulting in some variation in the maximum instantaneous brightness. It is understood that to effectively utilize the available data voltage range, the data voltage's extreme value is written in each subframe to maximize the brightness of the light-emitting device PD. Although the maximum instantaneous brightness of the light-emitting device PD may vary in different subframes, their brightness should be relatively close, and the data voltage corresponding to the maximum instantaneous brightness in each subframe should not vary significantly. For example, the data voltage difference corresponding to the maximum instantaneous brightness in different subframes is no more than 0.2ΔV, where ΔV is the voltage difference between the maximum value and the minimum value of the data voltage provided by the display panel.

[0021] In the embodiment of the present invention, the light emitting device includes a first light emitting device and a second light emitting device with different luminous colors. The pixel circuit includes a first pixel circuit and a second pixel circuit. The first pixel circuit is connected to the first light emitting device, and the second pixel circuit is connected to the second light emitting device. Figure 4A Schematic diagram of a display panel provided by an embodiment of the present invention. Figure 4A As shown, the first pixel circuit 11 is connected to the first light-emitting device PD1, and the second pixel circuit 12 is connected to the second light-emitting device PD2. The first pixel circuit 11 and the second pixel circuit 12 both include a driving transistor Tm and a light-emitting control transistor T0, and the driving transistor Tm and the light-emitting control transistor T0 are connected in series. The control end of the light-emitting control transistor T0 in the first pixel circuit 11 receives a first light-emitting control signal Emit1, and the control end of the light-emitting control transistor T0 in the second pixel circuit 12 receives a second light-emitting control signal Emit2. The first light-emitting control signal Emit1 and the second light-emitting control signal Emit2 respectively control the duration of the light-emitting phase of the first pixel circuit 11 and the second pixel circuit 12. It can be understood that when Figure 4A The pixel circuit is as follows Figure 1 In the schematic structure, the light emitting control transistor T0 is the light emitting control transistor M2.

[0022] In other embodiments, Figure 4B Schematic diagram of another display panel provided by an embodiment of the present invention. Figure 4B As shown, the first pixel circuit 11 is connected to the first light emitting device PD1, and the second pixel circuit 12 is connected to the second light emitting device PD2. The first pixel circuit 11 and the second pixel circuit 12 each include a driving transistor Tm and two light emitting control transistors T0, and the driving transistor Tm is connected in series between the two light emitting control transistors T0. The control terminal of the light emitting control transistor T0 in the first pixel circuit 11 receives the first light emitting control signal Emit1, and the control terminal of the light emitting control transistor T0 in the second pixel circuit 12 receives the second light emitting control signal Emit2. It can be understood that when Figure 4B The pixel circuit is Figure 2 In the schematic structure, the two light emitting control transistors T0 are respectively the first light emitting control transistor M5 and the second light emitting control transistor M6, and the driving transistor Tm is connected in series between the first light emitting control transistor M5 and the second light emitting control transistor M6.

[0023] One frame of the display panel includes N subframes, where N is an integer and N ≥ 2. The N subframes corresponding to the first pixel circuit 11 include subframes 1 to N, which are sorted from shortest to longest in terms of light-emitting phase duration. The N subframes corresponding to the second pixel circuit 12 include subframes 1 to N, which are sorted from shortest to longest in terms of light-emitting phase duration. The first light-emitting device PD1 and the second light-emitting device PD2 each display grayscale levels according to the subframe instantaneous brightness distribution rule.

[0024] It should be noted here that a frame includes N subframes, and there are two ways to sort the N subframes of a frame. One sorting method is to sort the N subframes according to the duration of the light-emitting phase in the subframe, and the other sorting method is to sort the N subframes according to the time order of display. The N subframes included in a frame are sorted from short to long according to the duration of the light-emitting phase. The N subframes corresponding to the first pixel circuit 11 include the 1st subframe to the Nth subframe, and the N subframes corresponding to the second pixel circuit 12 include the 1st subframe to the Nth subframe. The 1st subframe corresponding to the first pixel circuit 11 and the 1st subframe corresponding to the second pixel circuit 12 can be the same subframe displayed in time sequence, or they can be different subframes displayed in time sequence. In the following embodiments, the 1st subframe, the 2nd subframe, the i-th subframe, etc., unless otherwise specified, refer to the subframe sorted from short to long according to the duration of the light-emitting phase.

[0025] Figure 5 A schematic diagram of a pixel circuit in a light-emitting stage in a subframe provided by an embodiment of the present invention. Figure 5 The figure shows two subframes Z in one frame display, and indicates that the first pixel circuit 11 corresponds to the first subframe Z11 and the second subframe Z12, and the second pixel circuit 12 corresponds to the first subframe Z21 and the second subframe Z22. Figure 5 The order of the first subframe and the second subframe in time display is not limited. The position of the light-emitting phase in the subframe Z is indicated by pattern filling. Among them, the light-emitting phase of the first pixel circuit 11 in its corresponding first subframe Z11 is t 11 , the duration of the light-emitting phase in the corresponding second subframe Z12 is t 12 The duration of the light emitting phase of the second pixel circuit 12 in its corresponding first subframe Z21 is t 21 , the duration of the light-emitting phase in the corresponding second subframe Z22 is t 22 ;t 11 / t 12 >t 21 / t 22 .

[0026] In the related art, when a frame of a display panel includes N subframes and the light-emitting device PD displays grayscale levels according to the instantaneous brightness distribution rule of the subframe, the pixel circuits electrically connected to the light-emitting devices PD of different light-emitting colors are controlled by the same light-emitting control signal Emit. That is, in the basic multi-subframe driving scheme, the pixel circuits connected to light-emitting devices of different colors have the same light-emitting phase duration in the same subframe. That is, the first subframe corresponding to the pixel circuit connected to the first light-emitting device PD1 and the pixel circuit connected to the second light-emitting device PD2 is the same subframe displayed in time sequence, and the light-emitting phase duration of the first subframe corresponding to the two pixel circuits is the same. The second subframe corresponding to the pixel circuit connected to the first light-emitting device PD1 and the pixel circuit connected to the second light-emitting device PD2 is the same subframe displayed in time sequence, and the light-emitting phase duration of the second subframe corresponding to the two pixel circuits is the same. There is a relationship in the related art: t 11 =t 21 , t 12 =t 22 , t 11 / t 12 =t 21 / t 22 In the embodiment of the present invention, t 11 / t 12 >t 21 / t 22 , which is equivalent to increasing t 11 The obtained value is the light emitting phase duration t of the first subframe Z11 corresponding to the first pixel circuit 11. 11 The setting is relatively longer.

[0027] In the display panel provided by the embodiment of the present invention, a first light-emitting device PD1 and a second light-emitting device PD2 having different luminous colors are respectively connected to a first pixel circuit 11 and a second pixel circuit 12. One frame of the display panel includes N subframes, and the duration of the luminous phase of the first pixel circuit 11 and the second pixel circuit 12 in the subframe can be controlled independently of each other. The first pixel circuit 11 and the second pixel circuit 12 respectively correspond to the 1st to Nth subframes sorted from short to long in terms of the duration of the luminous phase, and the first light-emitting device PD1 and the second light-emitting device PD2 respectively display grayscale levels according to the subframe instantaneous brightness distribution rule. And set t 11 / t 12 >t 21 / t 22 , the light emitting phase duration t of the first subframe Z11 corresponding to the first pixel circuit 11 11The setting is relatively longer. When the first light-emitting device PD1 allocates grayscale levels according to the sub-frame instantaneous brightness allocation rule, more grayscales can be allocated in the first sub-frame Z11 in which the first pixel circuit 11 is operating, so that the starting grayscale of the second sub-frame Z12 is higher. When the first light-emitting device PD1 emits light in both the first sub-frame Z11 and the second sub-frame Z12, the first light-emitting device PD1 has reached the maximum instantaneous brightness in the first sub-frame Z11, which can compensate to a certain extent for the low efficiency and unevenness caused by the low current in the initial stage of the second sub-frame Z12, and the current density in the second sub-frame Z12 will also increase quickly, ensuring the luminous efficiency of the first light-emitting device PD1. When the display panel operates in a relatively high brightness mode, it can ensure that the first light-emitting device PD1 has high luminous efficiency, reduce the power consumption of the display panel, and improve display uniformity.

[0028] In the embodiment of the present invention, the first subframe Z11 corresponding to the first pixel circuit 11 is the subframe with the shortest light-emitting phase duration among the N subframes corresponding to it, and the first subframe Z21 corresponding to the second pixel circuit 12 is the subframe with the shortest light-emitting phase duration among the N subframes corresponding to it. The light-emitting phase duration of the first subframe Z11 corresponding to the first pixel circuit 11 is t 11 The duration of the light emitting phase of the first subframe Z21 corresponding to the second pixel circuit 12 is t 21 , t 11 >t 21 . Compared to a solution in which the two pixel circuits driving the first light-emitting device PD1 and the second light-emitting device PD2 have the same light-emitting phase duration in the subframe with the shortest light-emitting phase duration, the embodiment of the present invention increases the light-emitting phase duration of the pixel circuit connected to the first light-emitting device PD1 in the subframe with the shortest light-emitting phase duration. As a result, the first light-emitting device PD1 can be allocated more grayscales in the first subframe Z11 in which the first pixel circuit 11 is operating, so that the starting grayscale of the second subframe Z12 is higher. When the display panel operates in a relatively high brightness mode, it can ensure that the first light-emitting device PD1 has high luminous efficiency and high brightness uniformity.

[0029] Figure 6 This is a current efficiency curve of the light-emitting device. Figure 6 (A) is the current efficiency curve of the first light emitting device PD1, Figure 6 (B) shows the current efficiency curve for the second light-emitting device PD2. The abscissa represents current, and the ordinate represents luminous efficiency. The luminous efficiency of the first light-emitting device PD1 changes slowly with current, meaning it reaches maximum luminous efficiency only at higher currents. In contrast, the luminous efficiency of the second light-emitting device PD2 increases rapidly with increasing current, reaching saturation. Therefore, the second light-emitting device PD2 can achieve maximum luminous efficiency even at relatively lower currents.

[0030] In the embodiment of the present invention, by increasing t 11 , so that t 11 / t 12 >t 21 / t 22 . Increasing the light-emitting duration of the first pixel circuit 11 connected to the first light-emitting device PD1 in the subframe with the shortest light-emitting duration allows the first light-emitting device PD1 to cover more grayscales when emitting light in the first subframe Z11, and improves the starting grayscale of the first light-emitting device PD1 in the second subframe Z12. When the first light-emitting device PD1 emits light in both the first subframe Z11 and the second subframe Z12, the first light-emitting device PD1 has reached the maximum instantaneous brightness in the first subframe Z11, which can compensate to a certain extent for the low efficiency and unevenness caused by the low current in the initial stage of the second subframe Z12, and the current density in the second subframe Z12 will also increase rapidly, which can improve the light-emitting efficiency of the first light-emitting device PD1. For the second light-emitting device PD2, since its light-emitting efficiency increases rapidly to saturation as the current increases, even if it is set to have a shorter light-emitting stage duration in the first subframe Z21, it can ensure that the second light-emitting device PD2 emits light at high efficiency.

[0031] In some embodiments, the wavelength of light emitted by the first light-emitting device PD1 is greater than the wavelength of light emitted by the second light-emitting device PD2. For example, the first light-emitting device PD1 is a red light-emitting device, and the second light-emitting device PD2 is a green light-emitting device or a blue light-emitting device. In the display panel, the red light-emitting device is electrically connected to the first pixel circuit 11, and the green light-emitting device or the blue light-emitting device is electrically connected to the second pixel circuit 12.

[0032] In some embodiments, the display panel includes a first light-emitting device PD1, a second light-emitting device PD2, and a third light-emitting device. The first light-emitting device PD1 emits light at a wavelength greater than that of the second light-emitting device PD2, and the first light-emitting device PD1 emits light at a wavelength greater than that of the third light-emitting device. The first light-emitting device PD1 is a red light-emitting device, electrically connected to the first pixel circuit 11. One of the second light-emitting device PD2 and the third light-emitting device is a green light-emitting device, and the other is a blue light-emitting device. The green light-emitting device and the blue light-emitting device are each electrically connected to the second pixel circuit 12.

[0033] In the embodiment of the present invention, the first light-emitting device PD1 emits light in the first subframe Z11 corresponding to the first pixel circuit 11 and reaches maximum instantaneous brightness, and the grayscale displayed by the first light-emitting device PD1 is Gm1. The second light-emitting device PD2 emits light in the first subframe Z21 corresponding to the second pixel circuit 12 and reaches maximum instantaneous brightness, and the grayscale displayed by the second light-emitting device PD2 is Gm2. Here, Gm1>Gm2. That is, when the first light-emitting device PD1 and the second light-emitting device PD2 each display grayscale levels according to the subframe instantaneous brightness distribution rule, the first light-emitting device PD1 emits light in the subframe with the shortest duration and allocates a greater number of grayscales compared to the second light-emitting device PD2. Therefore, the first light-emitting device PD1 has a wider grayscale adjustment range in its corresponding first subframe Z11, and the first light-emitting device PD1 has a higher starting grayscale in its corresponding second subframe Z12.

[0034] Figure 7 Schematic diagram of grayscale distribution principle of the first light emitting device in the embodiment of the present invention. Taking N=3 as an example, Figure 7 (A) is the improved solution before. The three subframes corresponding to the pixel circuit are sorted from short to long according to the duration of the light-emitting phase as the first subframe Z1, the second subframe Z2 and the third subframe Z3. Figure 7 (B) is an improved solution of the embodiment of the present invention, in which the three subframes corresponding to the first pixel circuit are sorted from short to long according to the duration of the light-emitting phase as the first subframe Z11, the second subframe Z12 and the third subframe Z13. Figure 7 (B) Compared to Figure 7 For example, in the example (A), the duration of the luminous phase of the first subframe Z11 is increased, making it longer than that of the first subframe Z1. However, the total duration of the luminous phase of the three subframes remains unchanged. The abscissa represents time t, and the ordinate represents luminance. The instantaneous brightness of the light-emitting device is related to the data voltage Data. In a display panel, the adjustable range of the data voltage Data is fixed, so the instantaneous brightness variation range of the light-emitting device PD is the same in each subframe.

[0035] According to the sub-frame instantaneous brightness distribution rule, Figure 7 In the (A) scheme, when the light-emitting device PD emits light in the first subframe Z1, the grayscale that can be displayed is 0 to 50 grayscale. When the first subframe Z1 reaches the maximum instantaneous brightness and emits light in the second subframe Z2, the grayscale that can be displayed is 51 to 140 grayscale. When both the first subframe Z1 and the second subframe Z2 reach the maximum instantaneous brightness and emit light in the third subframe Z3, the grayscale that can be displayed is 141 to 255 grayscale.

[0036] exist Figure 7(B) The improvement scheme increases the duration of the light-emitting phase of the first subframe Z11, but the instantaneous brightness variation range of the first light-emitting device PD1 in each subframe remains unchanged. The grayscale displayed by the first light-emitting device PD1 is related to the instantaneous brightness and the duration of the light-emitting phase. When the duration of the light-emitting phase is fixed and the instantaneous brightness is greater, the grayscale is larger. When the instantaneous brightness is fixed and the light-emitting phase is longer, the grayscale is larger. The duration of the light-emitting phase of the first light-emitting device PD1 in the first subframe Z11 is fixed. As the instantaneous brightness increases, the grayscale displayed by the first light-emitting device PD1 in the first subframe Z11 increases. Compared to Figure 7 (A) For example, the first light emitting device PD1 is Figure 7 In (B), the duration of the luminous phase of the first subframe Z11 is greater, then Figure 7 In (B), the first light-emitting device PD1 can display a wider range of grayscales in the first subframe Z11. When the first light-emitting device PD1 reaches maximum instantaneous brightness in the first subframe Z11, the grayscale value displayed is greater than the grayscale value displayed when the first light-emitting device PD1 reaches maximum instantaneous brightness in the first subframe Z12. This increases the starting grayscale at which the first light-emitting device PD1 emits light in the second subframe Z12. For example, when the first light-emitting device PD1 emits light in the first subframe Z11, the grayscale range it can display is 0 to 60. When the first light-emitting device PD1 reaches maximum instantaneous brightness in the first subframe Z11 and emits light in the second subframe Z12, the grayscale range it can display is 61 to 150. When the first and second subframes Z11 and Z12 both reach maximum instantaneous brightness and emit light in the third subframe Z13, the grayscale range it can display is 151 to 255.

[0037] Through the above principle description, it can be understood that the light emitting phase duration of the first subframe Z11 corresponding to the first pixel circuit 11 is increased so that t 11 / t 12 >t 21 / t 22 , which can increase the grayscale range that can be adjusted when the first light-emitting device PD1 emits light in the first subframe Z11, so that the grayscale displayed by the first light-emitting device PD1 when it reaches the maximum instantaneous brightness in the first subframe Z11 corresponding to the first pixel circuit 11 is greater than the grayscale displayed by the second light-emitting device PD2 when it reaches the maximum instantaneous brightness in the first subframe Z21 corresponding to the second pixel circuit 12.

[0038] In some embodiments, N≥3. The first light-emitting device PD1 emits light in n consecutive sub-frames sorted from short to long in the light-emitting stage corresponding to the first pixel circuit 11, and reaches the maximum instantaneous brightness in the n sub-frames. The gray scale displayed by the first light-emitting device PD1 is Gm3, where 2≤n<N. Here, the consecutive n sub-frames refer to n sub-frames within one frame. The second light-emitting device PD2 emits light in n consecutive sub-frames sorted from short to long in the light-emitting stage corresponding to the second pixel circuit 12, and reaches the maximum instantaneous brightness in the n sub-frames. The gray scale displayed by the second light-emitting device PD2 is Gm4; where Gm3>Gm4.

[0039] For example, when N = 3 and n = 2, the first light-emitting device PD1 emits light in two consecutive sub-frames sorted from short to long in the light-emitting stage corresponding to the first pixel circuit 11, and reaches the maximum instantaneous brightness in the two sub-frames. The gray scale displayed by the first light-emitting device PD1 is Gm3; the second light-emitting device PD2 emits light in two consecutive sub-frames sorted from short to long in the light-emitting stage corresponding to the second pixel circuit 12, and reaches the maximum instantaneous brightness in the two sub-frames. The gray scale displayed by the second light-emitting device PD2 is Gm4; Gm3>Gm4. That is, the adjustable range of the gray scale achieved by the first light-emitting device PD1 emitting light in the first sub-frame and the second sub-frame corresponding to the first pixel circuit 11 is greater than the adjustable range of the gray scale achieved by the second light-emitting device PD2 emitting light in the first sub-frame and the second sub-frame corresponding to the second pixel circuit 12. In other words, the maximum gray scale that the first light-emitting device PD1 can display by emitting light in the first sub-frame and the second sub-frame corresponding to the first pixel circuit 11 is greater than the maximum gray scale that the second light-emitting device PD2 can display by emitting light in the first sub-frame and the second sub-frame corresponding to the second pixel circuit 12.

[0040] In some embodiments of the present invention, Figure 8 FIG. is a schematic diagram of the light-emitting stage of another pixel circuit provided by an embodiment of the present invention in a sub-frame. Figure 8 It is shown that the first sub-frame Z11, the second sub-frame Z12, to the Nth sub-frame Z1N sorted from left to right are N sub-frames with the light-emitting stage duration of the first pixel circuit 11 sorted from short to long, and the first sub-frame Z21, the second sub-frame Z22, to the Nth sub-frame Z2N sorted from left to right are N sub-frames with the light-emitting stage duration of the second pixel circuit 12 sorted from short to long. The light-emitting stage duration of the first pixel circuit 11 in its corresponding first sub-frame Z11 is t 11 and the light-emitting stage duration in the second sub-frame Z12 is t 12 and the light-emitting stage duration in the Nth sub-frame Z1N is t 1N . The light-emitting stage duration of the second pixel circuit 12 in its corresponding first sub-frame Z21 is t 21 and the light-emitting stage duration in the second sub-frame Z22 is t 22, the duration of the light-emitting stage in the Nth sub-frame Z2N is t 2N .

[0041] Among them, the duration of the light-emitting stage of the first pixel circuit 11 in its corresponding ith sub-frame Z1i is t 1i , and the duration of the light-emitting stage of the second pixel circuit 12 in its corresponding ith sub-frame Z2i is t 2i , where i is an integer, 1 ≤ i ≤ N; t 1i >t 2i . That is, among the N sub-frames in one frame corresponding to the first pixel circuit 11 and the N sub-frames in one frame corresponding to the second pixel circuit 12, they are respectively sorted in ascending order of the duration of the light-emitting stage. In the two sub-frames corresponding to the same sequential position, the duration of the light-emitting stage of the first pixel circuit 11 is greater than that of the second pixel circuit 12. For example, the first light-emitting device PD1 is a red light-emitting device, and the second light-emitting device PD2 is a green light-emitting device or a blue light-emitting device. The setting of the embodiment of the present invention can make the light-emitting duration of the first light-emitting device PD1 greater than that of the second light-emitting device PD2, compensate for the difference in the light-emitting efficiency of different color light-emitting devices, and improve the display effect of the display panel.

[0042] In some embodiments, i is an integer, 1 < i ≤ N; the duration of the light-emitting stage of the first pixel circuit 11 in its corresponding ith sub-frame Z1i is t 1i , and the duration of the light-emitting stage of the second pixel circuit 12 in its corresponding ith sub-frame Z2i is t 2i , t 1i >t 2i .

[0043] In the embodiment of the present invention, the total duration of the light-emitting stage of the first pixel circuit 11 in the N sub-frames included in one frame is t1, and the total duration of the light-emitting stage of the second pixel circuit 12 in the N sub-frames included in one frame is t2, and t1 > t2. t1 = ; t2 = .

[0044] Among them, t 11 [[ID=#2019010410360001]] is the duration of the light-emitting stage in the first sub-frame sorted by the duration of the light-emitting stage corresponding to the first pixel circuit 11, t 12 is the duration of the light-emitting stage in the second sub-frame sorted by the duration of the light-emitting stage corresponding to the first pixel circuit 11, t 1N is the duration of the light-emitting stage in the Nth sub-frame sorted by the duration of the light-emitting stage corresponding to the first pixel circuit 11. T 21 is the duration of the light-emitting stage in the first sub-frame sorted by the duration of the light-emitting stage corresponding to the second pixel circuit 12, t 22 is the duration of the light-emitting stage in the second sub-frame sorted by the duration of the light-emitting stage corresponding to the second pixel circuit 12, t2N is the duration of the light emitting phase in the Nth subframe sorted by the duration of the light emitting phase corresponding to the second pixel circuit 12. The above formula is illustrated with N≥3. When N=2, it can be understood that t1= t 11 + t 12 , t2 = t 21 + t 22 .

[0045] For example, if the first light-emitting device PD1 is a red light-emitting device and the second light-emitting device PD2 is a green or blue light-emitting device, when displaying the same grayscale, the first light-emitting device PD1 emits light for a longer duration than the second light-emitting device PD2. This compensates for differences in luminous efficiency between light-emitting devices of different colors and improves the display quality of the display panel.

[0046] In some embodiments, the duration of the light emitting phase of the first pixel circuit 11 in its corresponding i-th subframe Z1i is t 1i The duration of the light emitting phase of the second pixel circuit 12 in its corresponding i-th subframe Z2i is t 2i The duration of the light emitting phase of the first pixel circuit 11 in its corresponding i-1 sub-frame Z1(i-1) is t 1(i-1) The duration of the light emitting phase of the second pixel circuit 12 in its corresponding i-1 subframe Z2(i-1) is t 2(i-1) , i is an integer, 1≤i-1≤N-1; where, t 1i -t 1(i-1) ≥t 2i -t 2(i-1) If N=3, i=2, t 12 -t 11 ≥t 22 -t 21 ; For example, when N=3, i=3, t 13 -t 12 ≥t 23 -t 22 Understandably, t 13 represents the duration of the light emitting phase of the first pixel circuit 11 in its corresponding third subframe Z13, t 23 Indicates the duration of the light-emitting phase of the second pixel circuit 12 in its corresponding third subframe Z23. In the embodiment of the present invention, the N subframes in a frame corresponding to the first pixel circuit 11 and the N subframes in a frame corresponding to the second pixel circuit 12 are arranged in ascending order according to the duration of the light-emitting phase, and the difference between the light-emitting phase durations of two subframes at adjacent sequence positions is calculated (the longer light-emitting phase duration minus the shorter light-emitting phase duration). For the difference between the first pixel circuit 11 and the second pixel circuit 12 at the same sequence position, the difference corresponding to the first pixel circuit 11 is greater than the difference corresponding to the second pixel circuit 12, that is, t 1i -t1(i-1) >t 2i -t 2(i-1) , or the difference corresponding to the first pixel circuit 11 is equal to the difference corresponding to the second pixel circuit 12, that is, t 1i -t 1(i-1) =t 2i -t 2(i-1) .

[0047] When t 1i -t 1(i-1) >t 2i -t 2(i-1) When combined with t 11 / t 12 >t 21 / t 22 and t 1i >t 2i , which is equivalent to the gradually increasing magnitude of the light-emitting phase duration of the N subframes corresponding to the first pixel circuit 11, which are arranged in ascending order according to the light-emitting phase duration, being greater than the gradually increasing magnitude of the light-emitting phase duration of the N subframes corresponding to the second pixel circuit 12, and the sum of the light-emitting phase durations of the N subframes corresponding to the first pixel circuit 11 being greater than the sum of the light-emitting phase durations of the N subframes corresponding to the second pixel circuit 12. This can compensate for the differences in luminous efficiency of light-emitting devices of different colors and improve the display effect of the display panel.

[0048] When t 1i -t 1(i-1) =t 2i -t 2(i-1) At least in the first subframe with the shortest light-emitting phase, the light-emitting phase duration of the first pixel circuit 11 corresponding to the first subframe is greater than the light-emitting phase duration of the second pixel circuit 12 corresponding to the first subframe, that is, t 11 >t 21 , which can satisfy t 11 / t 12 >t 21 / t 22 . Combined with t 1i -t 1(i-1) =t 2i -t 2(i-1) , and it is also possible to achieve that the total duration of the light-emitting phase of the N subframes corresponding to the first pixel circuit 11 is greater than the total duration of the light-emitting phase of the N subframes corresponding to the second pixel circuit 12, thereby compensating for the difference in light-emitting efficiency of light-emitting devices of different colors and improving the display effect of the display panel.

[0049] In some embodiments, Figure 9 A schematic diagram of another pixel circuit in a light-emitting stage in a subframe provided by an embodiment of the present invention. Figure 9It is shown that the (j - 1)-th sub-frame Z1(j - 1), the j-th sub-frame Z1j, and the (j + 1)-th sub-frame Z1(j + 1) sorted from left to right are three sub-frames with the emission stage durations corresponding to the first pixel circuit 11 sorted from short to long. Figure 9 It is shown that the (j - 1)-th sub-frame Z2(j - 1), the j-th sub-frame Z2j, and the (j + 1)-th sub-frame Z2(j + 1) sorted from left to right are three sub-frames with the emission stage durations corresponding to the second pixel circuit 12 sorted from short to long. Here, j is an integer, and 2 < j + 1 ≤ N. The emission stage duration of the first pixel circuit 11 in its corresponding j-th sub-frame Z1j is t 1j and the emission stage duration in its corresponding (j + 1)-th sub-frame Z1(j + 1) is t 1(j+1) ; the emission stage duration of the second pixel circuit 12 in its corresponding j-th sub-frame Z2j is t 2j and the emission stage duration in its corresponding (j + 1)-th sub-frame Z2(j + 1) is t 2(j+1) , t 1j / t 1(j+1) >t 2j / t 2(j+1) . In the embodiment of the present invention, first, t 11 / t 12 >t 21 / t 22 is set, and the emission stage duration t 11 of the first sub-frame Z11 corresponding to the first pixel circuit 11 is set to be relatively longer. When the first light-emitting device PD1 allocates gray-scale levels according to the sub-frame instantaneous brightness allocation rule, more gray-scale levels can be allocated in the first sub-frame Z11 when the first pixel circuit 11 is working, making the starting gray-scale level of the first light-emitting device PD1 in the second sub-frame Z12 higher. Further, t 1j / t 1(j+1) >t 2j / t 2(j+1) , t 1j / t 1(j+1) is larger. Then, when allocating gray-scale levels using the sub-frame instantaneous brightness allocation rule, the gray-scale levels displayed when the first light-emitting device PD1 emits light and reaches the maximum instantaneous brightness in the first sub-frame to the j-th sub-frame will be greater than the gray-scale levels displayed when the second light-emitting device PD2 emits light and reaches the maximum instantaneous brightness in the first sub-frame to the j-th sub-frame. Considering the efficiency-current curve differences between the first light-emitting device PD1 and the second light-emitting device PD2, the setting of the embodiment of the present invention can enable the first light-emitting device PD1 to display more gray-scale levels at high efficiency and reduce the power consumption of the display panel.

[0050] In some embodiments, N ≥ 3, j is an integer, and 2 < j + 1 ≤ N. For example Figure 9As shown, the light-emitting stage duration of the first pixel circuit 11 is t in its corresponding (j - 1)-th sub-frame Z1(j - 1). 1(j-1) and is t in its corresponding j-th sub-frame Z1j 1j and is t in its corresponding (j + 1)-th sub-frame Z1(j + 1). 1(j+1) For t 1(j-1) / t 1j ≤t 1j / t 1(j+1) In this embodiment, for the N sub-frames of the first pixel circuit 11 in one frame, they are sorted in ascending order of the light-emitting stage duration. The ratio of the light-emitting stage durations of two adjacent sub-frames in the sorting gradually increases. That is, the light-emitting durations corresponding to the N sub-frames sorted in ascending order of the light-emitting stage duration gradually increase, and the increasing amplitude gradually becomes larger. Thus, it can cooperate with the sub-frame instantaneous brightness allocation rule and the light-emitting characteristics of the LED, enabling the first light-emitting device PD1 to emit light more at high efficiency, and can avoid the shift of the emission wavelength and improve the display effect.

[0051] In some embodiments, N≥3, j is an integer, and 2 < j + 1 ≤ N. For example Figure 9 As shown, the light-emitting stage duration of the second pixel circuit 12 is t in its corresponding (j - 1)-th sub-frame Z2(j - 1). 2(j-1) and is t in its corresponding j-th sub-frame Z2j 2j and is t in its corresponding (j + 1)-th sub-frame Z2(j + )1 2(j+1) For t 2(j-1) / t 2j ≤t 2j / t 2(j+1) In this embodiment, for the N sub-frames of the second pixel circuit 12 in one frame, they are sorted in ascending order of the light-emitting stage duration. The ratio of the light-emitting stage durations of two adjacent sub-frames in the sorting gradually increases. That is, the light-emitting durations corresponding to the N sub-frames sorted in ascending order of the light-emitting stage duration gradually increase, and the increasing amplitude gradually becomes larger. Thus, it can cooperate with the sub-frame instantaneous brightness allocation rule and the light-emitting characteristics of the LED, enabling the second light-emitting device PD2 to emit light more at high efficiency, and can avoid the shift of the emission wavelength and improve the display effect.

[0052] In some embodiments, N≥3, j is an integer, and 2 < j + 1 ≤ N. For example Figure 9 As shown, the light-emitting stage duration of the first pixel circuit 11 is t in its corresponding (j - 1)-th sub-frame Z1(j - 1). 1(j-1) and is t in its corresponding j-th sub-frame Z1j 1j and is t in its corresponding (j + 1)-th sub-frame Z1(j + 1). 1(j+1) For t 1j-t 1(j-1) ≤t 1(j+1) -t 1j In this embodiment, the N sub-frames of the first pixel circuit 11 in one frame are sorted in ascending order of the light-emitting stage duration. The difference in the light-emitting stage duration between two adjacent sub-frames in the sorting (the longer light-emitting stage duration minus the shorter light-emitting stage duration) gradually increases. That is, the light-emitting durations corresponding to the N sub-frames sorted in ascending order of the light-emitting stage duration gradually increase, and the increase amplitude gradually becomes larger. Alternatively, it can also be that the N sub-frames of the first pixel circuit 11 in one frame are sorted in ascending order of the light-emitting stage duration, and the difference in the light-emitting stage duration between two adjacent sub-frames in the sorting is a fixed value. That is, the light-emitting durations corresponding to the N sub-frames sorted in ascending order of the light-emitting stage duration gradually increase, and the increase amplitude is a fixed value. Thereby, it can cooperate with the sub-frame instantaneous brightness distribution rule and the light-emitting characteristics of the LED, enabling the first light-emitting device PD1 to emit light more efficiently, and avoiding the shift of the emission wavelength and improving the display effect.

[0053] In some embodiments, N≥3, j is an integer, and 2 < j + 1 ≤ N. As Figure 9 shown, the light-emitting stage duration of the second pixel circuit 12 in its corresponding (j - 1)-th sub-frame Z2(j - 1) is t 2(j-1) , the light-emitting stage duration of its corresponding j-th sub-frame Z2j is t 2j , and the light-emitting stage duration of its corresponding (j + 1)-th sub-frame Z2(j + 1) is t 2(j+1) , t 2j -t 2(j-1) ≤t 2(j+1) -t 2j In this embodiment, the N sub-frames of the second pixel circuit 12 in one frame are sorted in ascending order of the light-emitting stage duration. The difference in the light-emitting stage duration between two adjacent sub-frames in the sorting (the longer light-emitting stage duration minus the shorter light-emitting stage duration) gradually increases, which is equivalent to that the light-emitting durations corresponding to the N sub-frames sorted in ascending order of the light-emitting stage duration gradually increase, and the increase amplitude gradually becomes larger. Alternatively, it can also be that the N sub-frames of the second pixel circuit 12 in one frame are sorted in ascending order of the light-emitting stage duration, and the difference in the light-emitting stage duration between two adjacent sub-frames in the sorting is a fixed value. That is, the light-emitting durations corresponding to the N sub-frames sorted in ascending order of the light-emitting stage duration gradually increase, and the increase amplitude is a fixed value. Thereby, it can cooperate with the sub-frame instantaneous brightness distribution rule and the light-emitting characteristics of the LED, enabling the second light-emitting device PD2 to emit light more efficiently, and avoiding the shift of the emission wavelength and improving the display effect.

[0054] In some embodiments, Figure 10 is another schematic diagram of the light-emitting stage of the pixel circuit provided by the embodiment of the present invention in a sub-frame. Figure 10The first subframe Z-1, the second subframe Z-2, and the Nth subframe ZN are displayed in time sequence in a frame, with N≥3 as an example. Figure 10 It can be seen that the first subframe Z-1 displayed in chronological order is the first subframe Z11 corresponding to the first pixel circuit 11, sorted from short to long by the duration of the light-emitting phase, and is also the first subframe Z21 corresponding to the second pixel circuit 12, sorted from short to long by the duration of the light-emitting phase; the second subframe Z-2 displayed in chronological order is the second subframe Z12 corresponding to the first pixel circuit 11, sorted from short to long by the duration of the light-emitting phase, and is also the second subframe Z22 corresponding to the second pixel circuit 12, sorted from short to long by the duration of the light-emitting phase; the Nth subframe ZN displayed in chronological order is the Nth subframe Z1N corresponding to the first pixel circuit 11, sorted from short to long by the duration of the light-emitting phase, and is also the Nth subframe Z2N corresponding to the second pixel circuit 12, sorted from short to long by the duration of the light-emitting phase. That is, in one frame of the display panel, the pth subframe Z1p corresponding to the first pixel circuit 11 and the pth subframe Z2p corresponding to the second pixel circuit 12 are the same subframe displayed in chronological order, where p is an integer, 1≤p≤N. This arrangement allows subframes with long light-emitting phases for the first pixel circuit 11 and subframes with long light-emitting phases for the second pixel circuit 12 to be displayed within the same subframe time, and subframes with short light-emitting phases for the first pixel circuit 11 and subframes with short light-emitting phases for the second pixel circuit 12 to be displayed within the same subframe time. In each subframe sorted by display time, the light-emitting durations of the first light-emitting device PD1 and the second light-emitting device PD2 do not differ significantly, thereby improving visual color shift and enhancing display quality.

[0055] In other embodiments, Figure 11 A schematic diagram of another pixel circuit in a light-emitting stage in a subframe provided by an embodiment of the present invention. Figure 11 The first subframe Z-1, the second subframe Z-2, and the Nth subframe ZN are displayed in time sequence in a frame, with N≥3 as an example. Figure 11 It can be seen that the first subframe Z-1 displayed in chronological order is the second subframe Z12 corresponding to the first pixel circuit 11, sorted from short to long by the duration of the light-emitting phase, and is also the first subframe Z21 corresponding to the second pixel circuit 12, sorted from short to long by the duration of the light-emitting phase; the second subframe Z-2 displayed in chronological order is the first subframe Z11 corresponding to the first pixel circuit 11, sorted from short to long by the duration of the light-emitting phase, and is also the second subframe Z22 corresponding to the second pixel circuit 12, sorted from short to long by the duration of the light-emitting phase. Among the N subframes displayed in chronological order, at least two subframes correspond to subframes at different sequential positions of the first pixel circuit 11 and the second pixel circuit 12, respectively, sorted by the duration of the light-emitting phase.

[0056] In some embodiments, in one frame of the display panel: the duration of the light-emitting phase of the first pixel circuit 11 in the N subframes displayed in time sequence gradually increases or gradually decreases, and / or the duration of the light-emitting phase of the second pixel circuit 12 in the N subframes displayed in time sequence gradually increases or gradually decreases. For example, in one frame, the duration of the light-emitting phase of the first pixel circuit 11 in the N subframes displayed in time sequence gradually increases, and the duration of the light-emitting phase of the second pixel circuit 12 in the N subframes displayed in time sequence gradually increases. Alternatively, in one frame, the duration of the light-emitting phase of the first pixel circuit 11 in the N subframes displayed in time sequence gradually decreases, and the duration of the light-emitting phase of the second pixel circuit 12 in the N subframes displayed in time sequence gradually decreases. Alternatively, in one frame, the duration of the light-emitting phase of the first pixel circuit 11 in the N subframes displayed in time sequence gradually increases, and the duration of the light-emitting phase of the second pixel circuit 12 in the N subframes displayed in time sequence gradually decreases. In this embodiment, within the N subframes displayed in chronological order within a frame, the duration of the light-emitting phase corresponding to the first pixel circuit 11 gradually changes, and / or the duration of the light-emitting phase corresponding to the second pixel circuit 12 gradually changes. The difference in the light-emitting duration of the first light-emitting device PD1 and / or the second light-emitting device PD2 between adjacent frames is relatively small, which can improve the display effect. Furthermore, the light-emitting control signals for the first pixel circuit 11 and / or the second pixel circuit 12 are provided in a more regular manner, making the control of the display panel relatively simple.

[0057] In some embodiments, in at least one of the N subframes included in a frame, the light emitting phase of the first pixel circuit 11 overlaps the light emitting phase of the second pixel circuit 12. Figure 10 In the illustrated frame, the first subframe Z-1, the second subframe Z-2, and the Nth subframe ZN are displayed in chronological order, with N ≥ 3 as an example. It can be seen that in the first subframe Z-1, the light-emitting phase of the first pixel circuit 11 overlaps the light-emitting phase of the second pixel circuit 12. In other words, the light-emitting phase of the second pixel circuit 12 is completed within the period of the light-emitting phase of the first pixel circuit 11. This configuration allows for the rational use of the time within the subframe, preventing excessive subframe time from affecting the refresh rate of the display panel.

[0058] In some embodiments, Figure 12 A schematic diagram of another pixel circuit in a light-emitting stage in a subframe provided by an embodiment of the present invention. Figure 12 The first subframe Z-1, the second subframe Z-2, and the Nth subframe ZN are displayed in time sequence in a frame, with N≥3 as an example. Figure 11It can be seen that in the first subframe Z-1 displayed in chronological order, the center moment of the light-emitting phase of the first pixel circuit 11 and the center moment of the light-emitting phase of the second pixel circuit 12 coincide, that is, the centers of the light-emitting phase lengths of the two are at the same moment; in the second subframe Z-1 displayed in chronological order, the center moment of the light-emitting phase of the first pixel circuit 11 and the center moment of the light-emitting phase of the second pixel circuit 12 coincide. Since the time when the human eye captures the three colors of red, green and blue is not necessarily the same, the three color devices of red, green and blue emit light in different time periods, which may cause color deviation problems. The embodiment of the present invention is arranged that in at least one of the N subframes included in a frame, the center moment of the light-emitting phase of the first pixel circuit 11 and the center moment of the light-emitting phase of the second pixel circuit 12 coincide, which can help improve visual color deviation and enhance the display effect.

[0059] In an embodiment of the present invention, the display panel includes a first light emitting control line Emit1 and a second light emitting control line Emit2. The first light emitting control line Emit1 provides a first light emitting control signal Emit1, and the second light emitting control line Emit2 provides a first light emitting control signal Emit2. Figure 4B As shown in FIG. 1 , the pixel circuit includes a driving transistor Tm and a light-emitting control transistor T0. The driving transistor Tm and the light-emitting control transistor T0 are connected in series. The first pixel circuit 11 is electrically connected to the first light-emitting control line Emit1, and the second pixel circuit 12 is electrically connected to the second light-emitting control line Emit2. Specifically, the control end of the light-emitting control transistor T0 in the first pixel circuit 11 is connected to the first light-emitting control line Emit1, and the control end of the light-emitting control transistor T0 in the second pixel circuit 12 is connected to the second light-emitting control line Emit2. Figure 1 In the embodiment, the pixel circuit includes a light emitting control tube M2, Figure 2 The pixel circuit in the embodiment includes a first light emitting control tube M5 and a second light emitting control tube M6.

[0060] Figure 13 A timing diagram of a light-emitting control signal provided by an embodiment of the present invention. Figure 13 Take two consecutive subframes Z in a frame displayed by the display panel as an example. Figure 13 The positions of the first pixel circuit 11 and the second pixel circuit 12 in the light emitting phase of the subframe Z are indicated by pattern filling. Figure 2 and Figure 13From the above, in subframe Z: the first light-emitting control line Emit1 provides an effective level (taking a low level as an effective level as an example) to control the first pixel circuit 11 to operate in the light-emitting stage, and the light-emitting stage duration of the first pixel circuit 11 is equal to the duration during which the first light-emitting control line Emit1 provides the effective level; the second light-emitting control line Emit2 provides an effective level (taking a low level as an example) to control the second pixel circuit 12 to operate in the light-emitting stage, and the light-emitting stage duration of the second pixel circuit 12 is equal to the duration during which the second light-emitting control line Emit2 provides the effective level.

[0061] In the embodiment of the present invention, corresponding light-emission control lines are provided for the first pixel circuit 11 and the second pixel circuit 12, respectively. This allows for independent control of the light-emission durations of the first pixel circuit 11 and the second pixel circuit 12 within a subframe. This ensures that the first pixel circuit 11 has N subframes sorted from shortest to longest light-emission duration, and the second pixel circuit 12 has N subframes sorted from shortest to longest light-emission duration.

[0062] In some embodiments, a pixel circuit row includes a first pixel circuit 11 and a second pixel circuit 12, and multiple pixel circuit rows in a display panel are driven row by row to realize the display of a subframe. The first pixel circuit 11 in a pixel circuit row is electrically connected to the first light-emitting control line Emit1, and the second pixel circuit 12 is electrically connected to the second light-emitting control line Emit2. During the process of the pixel circuits in a pixel circuit row completing the writing phase and the light-emitting phase, the signals provided by the first light-emitting control line Emit1 and the second light-emitting control line Emit2 respectively include valid levels. Figure 13 As shown, in at least one of the N subframes included in a frame: the first light-emitting control line Emit1 starts providing an effective level no later than the second light-emitting control line Emit2 starts providing an effective level, and / or the first light-emitting control line Emit1 ends providing an effective level no earlier than the second light-emitting control line Emit2 ends providing an effective level. When driving pixel circuits located in the same pixel circuit row to perform a light-emitting phase, this embodiment of the present invention allows the period during which the first light-emitting control line Emit1 provides an effective level to overlap as much as possible with the period during which the second light-emitting control line Emit2 provides an effective level. This allows the light-emitting phase of the first pixel circuit 11 to overlap the light-emitting phase of the second pixel circuit 12. This configuration allows for the rational use of time within a subframe, preventing excessive subframe time from affecting the refresh rate of the display panel.

[0063] In some embodiments, Figure 14 Another timing diagram of light-emitting control signals provided by an embodiment of the present invention. Figure 14Taking two consecutive subframes Z within a frame displayed by a display panel as an example, in at least one of the N subframes, when driving pixel circuits in the same pixel circuit row to perform a light-emission phase, the center moment at which the first light-emission control line Emit1 provides an active level coincides with the center moment at which the second light-emission control line Emit2 provides an active level. This arrangement ensures that, in at least one of the N subframes, the center moment at which the light-emission phase of the first pixel circuit 11 coincides with the center moment at which the light-emission phase of the second pixel circuit 12 coincides, which can help improve visual color shift and enhance display quality.

[0064] Based on the same inventive concept, an embodiment of the present invention further provides a display device, Figure 15 Schematic diagram of a display device provided by an embodiment of the present invention. Figure 15 As shown, the display device includes a display panel 100 provided by any embodiment of the present invention. The structure of the display panel 100 has been described in the above embodiments and will not be repeated here. The display device provided by the embodiment of the present invention can be, for example, a mobile phone, tablet, computer, television, smart wearable product, or other electronic device with a display function.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all 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 panel, characterized in that: The display panel includes a light-emitting device and a pixel circuit, wherein the light-emitting device includes a first light-emitting device and a second light-emitting device with different luminous colors, and the pixel circuit includes a first pixel circuit and a second pixel circuit, wherein the first pixel circuit is connected to the first light-emitting device and the second pixel circuit is connected to the second light-emitting device; One frame of the display panel includes N subframes, where N is an integer and N≥2; the operation of the pixel circuit in the subframe includes a light-emitting phase, and the N subframes corresponding to the pixel circuit include a 1st subframe to an Nth subframe sorted from shortest to longest in terms of the duration of the light-emitting phase; the light-emitting device displays grayscale levels according to a subframe instantaneous brightness allocation rule, and the subframe instantaneous brightness allocation rule includes: the grayscale displayed by the light-emitting device increases as its instantaneous brightness in the subframe increases; after the light-emitting device reaches maximum instantaneous brightness in the current subframe, it is allocated to emit light in the next subframe, and the duration of the light-emitting phase in the next subframe is not less than the duration of the light-emitting phase in the current subframe; The duration of the light emitting phase of the first pixel circuit in its corresponding first subframe is t 11 In the corresponding second subframe, the duration of the light-emitting phase is t 12 The duration of the light emitting phase of the second pixel circuit in the first subframe corresponding to the second pixel circuit is t 21 In the corresponding second subframe, the duration of the light-emitting phase is t 22 ; t 11 / t 12 > t 21 / t 22 。 2. The display panel according to claim 1, wherein: t 11 > t 21 。 3. The display panel according to claim 1, wherein: The duration of the light emitting phase of the first pixel circuit in its corresponding i-th subframe is t 1i The duration of the light emitting phase of the second pixel circuit in its corresponding i-th subframe is t 2i , i is an integer, 1 <i≤N; Among them, t 1i >t 2i .

4. The display panel according to claim 1, wherein: The duration of the light emitting phase of the first pixel circuit in its corresponding i-th subframe is t 1i The duration of the light emitting phase of the second pixel circuit in its corresponding i-th subframe is t 2i The duration of the light emitting phase of the first pixel circuit in its corresponding i-1 subframe is t 1(i-1) The duration of the light emitting phase of the second pixel circuit in its corresponding i-1 subframe is t 2(i-1) , i is an integer, 1≤i-1≤N-1; Among them, t 1i -t 1(i-1) ≥t 2i -t 2(i-1) .

5. The display panel according to claim 1, wherein: The duration of the light emitting phase of the first pixel circuit in its corresponding j-th subframe is t 1j , the duration of the light-emitting phase in the corresponding j+1 subframe is t 1(j+1) The duration of the light emitting phase of the second pixel circuit in its corresponding j-th subframe is t 2j , the duration of the light-emitting phase in the corresponding j+1 subframe is t 2(j+1) , j is an integer, 2 <j+1≤N; t 1j / t 1(j+1) > t 2j / t 2(j+1) 。 6. The display panel according to claim 1, wherein: N≥3, j is an integer, 2 <j+1≤N; The duration of the light emitting phase of the first pixel circuit in its corresponding j-1 subframe is t 1(j-1) , the duration of the lighting phase in the corresponding j-th subframe is t 1j , the duration of the light-emitting phase in the corresponding j+1 subframe is t 1(j+1) , t 1(j-1) / t 1j ≤t 1j / t 1(j+1) ; And / or, the duration of the light emitting phase of the second pixel circuit in its corresponding j-1 subframe is t 2(j-1) , the duration of the lighting phase in the corresponding j-th subframe is t 2j , the duration of the light-emitting phase in the corresponding j+1 subframe is t 2(j+1) , t 2(j-1) / t 2j ≤t 2j / t 2(j+1) .

7. The display panel according to claim 1, wherein: N≥3, j is an integer, 2 <j+1≤N; The duration of the light emitting phase of the first pixel circuit in its corresponding j-1 subframe is t 1(j-1) , the duration of the lighting phase in the corresponding j-th subframe is t 1j , the duration of the light-emitting phase in the corresponding j+1 subframe is t 1(j+1) , t 1j -t 1(j-1) ≤t 1(j+1) -t 1j ; And / or, the duration of the light emitting phase of the second pixel circuit in its corresponding j-1 subframe is t 2(j-1) , the duration of the lighting phase in the corresponding j-th subframe is t 2j , the duration of the light-emitting phase in the corresponding j+1 subframe is t 2(j+1) , t 2j -t 2(j-1) ≤t 2(j+1) -t 2j .

8. The display panel according to claim 1, wherein: The total duration of the light emitting phase of the first pixel circuit in the N subframes is t1, the total duration of the light emitting phase of the second pixel circuit in the N subframes is t2, and t1>t2.

9. The display panel according to claim 1, wherein: The first light-emitting device emits light in the first subframe corresponding to the first pixel circuit and reaches a maximum instantaneous brightness, and the grayscale displayed by the first light-emitting device is Gm1; The second light-emitting device emits light in the first subframe corresponding to the second pixel circuit and reaches a maximum instantaneous brightness. The grayscale displayed by the second light-emitting device is Gm2; wherein Gm1>Gm2.

10. The display panel according to claim 9, wherein: N≥3， The first light-emitting device emits light in n consecutive subframes arranged from short to long in the light-emitting phase corresponding to the first pixel circuit, and reaches the maximum instantaneous brightness in n subframes. The grayscale displayed by the first light-emitting device is Gm3, 2≤n <N; The second light-emitting device emits light in n consecutive subframes sorted from short to long in the light-emitting phase corresponding to the second pixel circuit, and reaches the maximum instantaneous brightness in n subframes, and the grayscale displayed by the second light-emitting device is Gm4; wherein Gm3>Gm4.

11. The display panel according to claim 1, wherein In one frame of the display panel, the p-th subframe corresponding to the first pixel circuit and the p-th subframe corresponding to the second pixel circuit are the same subframe displayed in time sequence, where p is an integer, 1≤p≤N.

12. The display panel according to claim 1, wherein In one frame of the display panel: The duration of the light-emitting phase of the first pixel circuit in the N subframes displayed in chronological order gradually increases or gradually decreases, and / or the duration of the light-emitting phase of the second pixel circuit in the N subframes displayed in chronological order gradually increases or gradually decreases.

13. The display panel according to claim 1, wherein In at least one of the N subframes included in a frame, a period during which the light-emitting phase of the first pixel circuit overlaps with a period during which the light-emitting phase of the second pixel circuit occurs.

14. The display panel according to claim 1, wherein In at least one of the N subframes included in a frame, a center time of the light-emitting phase of the first pixel circuit coincides with a center time of the light-emitting phase of the second pixel circuit.

15. The display panel according to claim 1, wherein The display panel includes a first light emitting control line and a second light emitting control line, the first pixel circuit is electrically connected to the first light emitting control line, and the second pixel circuit is electrically connected to the second light emitting control line; In the subframe: the first light-emitting control line provides an effective level to control the first pixel circuit to operate in the light-emitting stage, and the light-emitting stage duration of the first pixel circuit is equal to the duration during which the first light-emitting control line provides the effective level; the second light-emitting control line provides an effective level to control the second pixel circuit to operate in the light-emitting stage, and the light-emitting stage duration of the second pixel circuit is equal to the duration during which the second light-emitting control line provides the effective level.

16. The display panel according to claim 15, wherein: In at least one of the N subframes included in a frame: the starting moment when the first light-emitting control line provides a valid level is not later than the starting moment when the second light-emitting control line provides a valid level, and / or the ending moment when the first light-emitting control line provides a valid level is not earlier than the ending moment when the second light-emitting control line provides a valid level.

17. The display panel according to claim 16, wherein: In at least one of the N subframes included in one frame, a center time when the first light emitting control line provides an effective level coincides with a center time when the second light emitting control line provides an effective level.

18. The display panel according to claim 15, wherein: The pixel circuit includes a driving transistor and a light emitting control transistor, wherein the light emitting control transistor and the driving transistor are connected in series; The control end of the light emitting control transistor in the first pixel circuit is connected to the first light emitting control line, and the control end of the light emitting control transistor in the second pixel circuit is connected to the second light emitting control line.

19. The display panel according to claim 1, wherein The light emission wavelength of the first light emitting device is greater than the light emission wavelength of the second light emitting device.

20. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 19.

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