CN114333704A - Pixel driving circuit, driving method thereof and display panel - Google Patents
Pixel driving circuit, driving method thereof and display panel Download PDFInfo
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Abstract
The invention discloses a pixel driving circuit, a driving method thereof and a display panel, wherein the pixel driving circuit comprises: the device comprises a data writing module, a comparison module and a driving module; the comparison module responds to the reference voltage and the data voltage of the corresponding data line and outputs driving signals with different duty ratios according to the comparison result of the reference voltage and the data voltage; the first end of the data writing module is connected with the comparison module; the data writing module is used for responding to the scanning signal provided by the corresponding scanning line, outputting the data signal of the corresponding data line to the comparison module or outputting the driving signal output by the comparison module to the driving module; a control end of the driving module acquires a driving signal; the first end of the driving module is connected with the first power supply output end; the second end of the driving module is connected with the second power output end through the light-emitting unit so as to drive the light-emitting unit. The technical scheme provided by the invention can effectively solve the problem of uneven light emission under a low gray scale picture.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel driving circuit, a driving method thereof and a display panel.
Background
With the development of display technology, Organic Light Emitting Diodes (OLEDs), which are current type light emitting devices, are increasingly used in high performance display panels due to their characteristics of self-luminescence, fast response, and wide viewing angle. In an OLED display panel, each pixel unit generally includes an OLED device and a pixel driving circuit for driving the OLED device.
However, the OLED display panel has low luminous efficiency at low current, and in the low gray scale image, Vdata determines that the current on the LED loop is small (i.e. the luminous efficiency is low), so that the problem of uneven light emission exists when the whole image has different gray scales.
Disclosure of Invention
The embodiment of the invention provides a pixel driving circuit, a driving method thereof and a display panel, which are used for effectively solving the problem of uneven light emission under a low-gray-scale picture.
In a first aspect, an embodiment of the present invention provides a pixel driving circuit, including: the device comprises a data writing module, a comparison module and a driving module;
the comparison module responds to a reference voltage output by a reference voltage output end and a data voltage corresponding to a data line and outputs driving signals with different duty ratios according to a comparison result of the reference voltage and the data voltage;
the control end of the data writing module is connected with the corresponding scanning line; the first end of the data writing module is connected with the comparison module; the data writing module is used for responding to a scanning signal provided by a corresponding scanning line, outputting a data signal of the corresponding data line to the comparison module or outputting a driving signal output by the comparison module to the driving module;
the control end of the driving module acquires the driving signal; the first end of the driving module is connected with the first power supply output end; and the second end of the driving module is connected with the second power output end through the light-emitting unit so as to drive the light-emitting unit.
In a second aspect, an embodiment of the present invention further provides a driving method for a pixel driving circuit, which is applicable to the pixel driving circuit provided in any embodiment of the present invention, and the driving method for the pixel driving circuit includes:
the reference voltage output end outputs reference voltage to the comparison module; inputting a scanning signal to the data writing module by a corresponding scanning line, wherein the potential of the scanning signal is an effective potential; the potential of the data signal output corresponding to the data line is an effective potential;
the comparison module compares the reference voltage with the data signal and outputs driving signals with different duty ratios according to a comparison structure;
the data writing module responds to a scanning line provided by a corresponding scanning line, and outputs a data signal of the corresponding data line to the comparison module or outputs a driving signal output by the comparison module to the driving module;
and the control end of the driving module acquires the driving signal and drives the light-emitting unit under the control of the driving signal.
In a third aspect, an embodiment of the present invention further provides a display panel, including the pixel driving circuit according to any one of the embodiments of the present invention; further comprising:
a light emitting unit provided corresponding to the pixel driving circuit; the pixel driving circuit is used for driving the corresponding light-emitting unit to emit light.
The pixel driving circuit comprises a data writing module, a comparison module and a driving module, wherein the comparison module can compare a reference voltage output by a reference voltage output end with a data signal of a data line and output driving signals with different duty ratios according to a comparison result, the data writing module is used for writing the data signal into an input end of the comparison module or sending the driving signals with different duty ratios output by the comparison module to a control end of the driving module, and the driving module provides current for a light-emitting unit under the control of the driving signals so as to enable the light-emitting unit to emit light. The driving module drives the light-emitting unit with constant driving current, the brightness of the light-emitting unit is adjusted only by adjusting the duty ratio of the driving signal, the problem of uneven light emission of the light-emitting unit under different gray scales of a picture cannot be caused due to constant driving current, and the uniformity of display brightness is ensured. In addition, the reference voltage output end is an internal terminal of the display device, the reference voltage and the data signal come from the same driving chip, and the driving chip can be self-synchronized without coordination, so that the brightness adjustment structure of the light-emitting unit is simple and high in feasibility.
Drawings
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a specific structure of the pixel driving circuit shown in FIG. 1;
FIG. 4 is a schematic diagram of another embodiment of the pixel driving circuit shown in FIG. 1;
FIG. 5 is a schematic diagram of another embodiment of the pixel driving circuit shown in FIG. 1;
FIG. 6 is a schematic diagram of a specific structure of the pixel driving circuit shown in FIG. 2;
FIG. 7 is a schematic diagram of a specific structure of the pixel driving circuit shown in FIG. 2;
FIG. 8 is a schematic diagram of a specific structure of the pixel driving circuit shown in FIG. 2;
FIG. 9 is a waveform diagram of a reference voltage according to an embodiment of the present invention;
FIG. 10 is a waveform diagram of another reference voltage provided by an embodiment of the present invention;
FIG. 11 is a schematic diagram of driving signals with different duty ratios according to an embodiment of the present invention;
fig. 12 is a waveform diagram of a pixel driving circuit in a frame scanning period according to an embodiment of the present invention;
FIG. 13 is a waveform diagram of a reference voltage according to an embodiment of the present invention;
FIG. 14 is a waveform diagram of another reference voltage provided by an embodiment of the present invention;
FIG. 15 is a waveform diagram of a pixel driving circuit in a frame period according to an embodiment of the present invention;
fig. 16 is a flowchart illustrating a driving method of a pixel driving circuit according to an embodiment of the invention;
fig. 17 is a schematic structural diagram of a display panel according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the prior art, the brightness of the light-emitting unit is adjusted by adjusting the magnitude of the driving current value output to the light-emitting unit through a data signal, so that poor brightness uniformity and poor brightness adjusting effect exist easily under different gray scale pictures. The embodiment of the invention controls the light-emitting unit to drive the light-emitting unit at a constant current, adjusts the brightness of the light-emitting unit by adjusting the duty ratio of the driving current, realizes the display of pictures with different gray scales, and effectively ensures the brightness uniformity of the display device by the light-emitting unit of the current type device because the constant current drive of the light-emitting unit is always kept.
Specifically, an embodiment of the present invention provides a pixel driving circuit, including: the device comprises a data writing module, a comparison module and a driving module;
the comparison module responds to a reference voltage output by the reference voltage output end and a data voltage corresponding to the data line and outputs driving signals with different duty ratios according to a comparison result of the reference voltage and the data voltage;
the control end of the data writing module is connected with the corresponding scanning line; the first end of the data writing module is connected with the comparison module; the data writing module is used for responding to the scanning signal provided by the corresponding scanning line, outputting the data signal of the corresponding data line to the comparison module or outputting the driving signal output by the comparison module to the driving module;
a control end of the driving module acquires a driving signal; the first end of the driving module is connected with the first power supply output end; the second end of the driving module is connected with the second power output end through the light-emitting unit so as to drive the light-emitting unit.
In the embodiment of the invention, the pixel driving circuit comprises a data writing module, a comparison module and a driving module, wherein the comparison module can compare a reference voltage output by a reference voltage output end with a data signal of a data line and output driving signals with different duty ratios according to a comparison result, the data writing module is used for writing the data signal into an input end of the comparison module or sending the driving signals with different duty ratios output by the comparison module to a control end of the driving module, and the driving module provides current for the light emitting unit under the control of the driving signals so as to enable the light emitting unit to emit light. The driving module drives the light-emitting unit with constant driving current, the brightness of the light-emitting unit is adjusted only by adjusting the duty ratio of the driving signal, the problem of uneven light emission of the light-emitting unit under different gray scales of a picture cannot be caused due to constant driving current, and the uniformity of display brightness is ensured. In addition, the reference voltage output end is an internal terminal of the display device, the reference voltage and the data signal come from the same driving chip, and the driving chip can be self-synchronized without coordination, so that the brightness adjustment structure of the light-emitting unit is simple and high in feasibility.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present invention, as shown in fig. 1 and fig. 2, the pixel driving circuit includes a data writing module 11, a comparing module 12, and a driving module 13. The input end of the comparison module 12 is connected to the reference voltage output end 2, and is capable of obtaining a reference voltage sweet from the reference voltage output end, the input end of the comparison module 12 is also capable of obtaining a DATA signal VDATA output by a corresponding DATA line, and the comparison module 12 is configured to compare the reference voltage sweet and the DATA signal VDATA, specifically, compare values of the reference voltage sweet and the DATA signal VDATA, and output a driving signal PWM _ DATA with different duty ratios according to a comparison result. The duty ratio is a proportion of a duration in which the potential of the driving signal PWM _ DATA is the effective potential to the entire pulse period within one pulse period. For example, if the time required for scanning one line is one pulse period in the scanning process of the display panel, the duty ratio of the duration during which the potential of the driving signal PWM _ DATA is the active potential to the time required for scanning one line is the duty ratio.
The driving signal is used for inputting to the control terminal of the driving module 13. A first end of the driving module 13 is connected to the first power output terminal PVDD, and a second end of the driving module is connected to the second power output terminal PVEE through the light emitting unit 14. The driving module 13 provides a driving current to the light emitting unit 14 under the control of the driving signal. In this embodiment, since the driving signal PWM _ DATA is a signal with a constant value and a variable duty ratio, the driving current provided by the driving module 13 to the light emitting unit 14 is also a signal with a constant value and a variable duty ratio. Even if the image with different gray scales needs to be displayed, the driving current flowing through the light emitting unit 14 is still a constant value, so that the problems that the light emitting unit 14 has low light emitting efficiency at a low gray scale and has high light emitting efficiency at a high gray scale are effectively solved, the light emitting unit 14 has the same light emitting efficiency at any gray scale, and the uniformity of image display is improved. In addition, when the brightness of the light emitting unit 14 is adjusted, it is only necessary to adjust the duty ratio of the driving current without changing the driving current flowing through the light emitting unit 14. In addition, the constant driving signal can keep the current value passing through the light emitting unit 14 at a larger value, so that the light emitting unit 14 works in a high-efficiency state, the overall power consumption is effectively reduced, the situation that the luminance is lower when the light emitting unit 14 works in a low efficiency mode, and the driving power is increased to achieve the target luminance, thereby increasing the energy consumption is avoided.
The control end of the data writing module 11 is connected to the corresponding scan line for receiving the scan signal GOUT. The first end of the data writing module 11 is connected with the comparing module 12. As shown in fig. 2, the data writing module 11 is configured to input a data signal VDATA of a data line to the comparing module 12 under the control of the scan signal GOUT, so that the comparing module 12 compares the reference voltage sweet with the data signal VDATA. Alternatively, as shown in fig. 1, the DATA writing module 11 is configured to output the driving signal PWM _ DATA output by the comparing module 12 to the driving module 13 under the control of the scanning signal GOUT.
It should be noted that the reference voltage output terminal may be an output terminal of a driving chip in the display device. The driving chip is used for outputting internal signals such as a control signal of the gate driving circuit, a data signal and the like to the display panel for image display, in the embodiment, the reference voltage sweet and the internal signals are both output by the driving chip, and then the driving chip outputs synchronous reference voltage and internal signals by itself. The pixel driving circuit of the embodiment has the advantages of simple structure, easy realization and high feasibility. An external generator is not required to be arranged to generate the reference voltage, so that the condition that the external generator is debugged to be synchronous with the internal signal is avoided.
Fig. 1 and 2 each show a structure of a pixel driving circuit, and the structure of the pixel driving circuit shown in fig. 1 will be described first. Referring to fig. 1, optionally, a first input terminal of the comparing module 12 is connected to the reference voltage output terminal, and a second input terminal of the comparing module 12 is connected to the corresponding data line; the output end of the comparison module 12 is connected with the first end of the data writing module 11; the second end of the DATA writing module 11 is electrically connected to the control end of the driving module 13, and is configured to transmit the driving signal PWM _ DATA to the driving module 13.
The comparison module 12 comprises a first input and a second input. The first input terminal is connected to the reference voltage output terminal for receiving the reference voltage sweet, the second input terminal is connected to the corresponding DATA line for receiving the DATA signal VDATA, the output terminal of the comparing module 12 is connected to the first terminal of the DATA writing module 11 for transmitting the driving signal PWM _ DATA to the DATA writing module 11, and the DATA writing module 11 transmits the driving signal PWM _ DATA from the second terminal to the control terminal of the driving module 13 under the control of the scanning signal GOUT. In this embodiment, the driving current generated by the driving module 13 is only related to the driving signal PWM _ DATA, and the driving current is constant when the value of the driving signal PWM _ DATA is constant, and the duty ratio of the driving current is the same as the driving signal, so as to keep the light emitting efficiency of the light emitting unit 14 the same at any gray level, thereby improving the uniformity of the image display.
Fig. 3 is a schematic diagram of a specific structure of the pixel driving circuit in fig. 1, and optionally, the data writing module 11 may include a switching transistor T1; the driving module 13 includes a driving transistor T2; the control end of the switching transistor T1 is connected with the corresponding scan line; a first terminal of the switching transistor T1 is connected to the output terminal of the comparison module 12; a second terminal of the switching transistor T1 is electrically connected to the control terminal of the driving transistor T2; a first terminal of the driving transistor T2 is connected to the first power supply output terminal PVDD; the second terminal of the driving transistor T2 is connected to the second power output terminal PVEE through the light emitting cell 14.
The data writing block 11 includes a switching transistor T1, and the driving block 13 includes a driving transistor T2. The control end of the switch transistor T1 is connected to the scan line for receiving the scan signal GOUT; the first terminal is connected to the output terminal of the comparing module 12, and the second terminal is connected to the driving transistor T2, for outputting the driving signal PWM _ DATA of the comparing module 12 to the control terminal of the driving transistor T2 when the scan signal is scanned to the pixel driving circuit in the current row. The first terminal of the driving transistor T2 is connected to the first power output terminal PVDD, and the second terminal of the driving transistor T2 is connected to the second power output terminal PVEE through the light emitting cell 14, so that the voltage across the light emitting cell 14 is the difference between the first power output terminal PVDD and the second power output terminal PVEE. Optionally, the comparison module 12 may comprise a comparator. According to the embodiment, the PWM signal with the data signal is acquired by building a hardware circuit, so that the light-emitting unit is kept in a high-efficiency state, and the power consumption of the panel is saved. Compared with the mode of adjusting the display brightness by adopting the algorithm to debug the power supply PWM signal, the problem that the power supply PWM signal increases power consumption for improving the brightness under low efficiency is avoided, meanwhile, the problem that the light emitting units emit light unevenly under different gray scale pictures cannot be generated, the mode of adjusting the display brightness by adopting the algorithm to debug the power supply PWM signal cannot ensure the brightness uniformity of the display device, and the adjusting effect is poor.
Optionally, in this embodiment, the light emitting unit 14 may be a current type device such as a micro-LED chip, a Mini-LED chip, or an OLED device, and the OLED device is illustrated as an example in fig. 3. Preferably, the light emitting unit 14 can be a micro-LED chip or a Mini-LED chip, and the embodiment adjusts the brightness of the micro-LED chip or the Mini-LED chip by the driving current with the variable duty ratio and the constant amplitude, and combines the constant current driving mode with the micro-LED technology, so as to ensure the uniformity of the display brightness of the micro-LED, avoid the problem of uneven light emission of the micro-LED chip or the Mini-LED chip under different gray scales, and improve the display quality of the micro-LED panel.
Fig. 4 is a schematic diagram of another specific structure of the pixel driving circuit in fig. 1, and optionally, the pixel driving circuit may further include: an inverter module 15; the inverter module 15 includes one or more inverters 151 connected in sequence; the second end of the data writing module 11 is connected to the control end of the driving module 13 through the inverter module 15.
In this embodiment, an inverter module 15 is disposed between the data writing module 11 and the driving module 13, and the inverter unit 15 includes at least one inverter 151 connected in sequence. At this time, the at least one inverter 151 connected in sequence can adjust the waveform of the driving signal PWM _ DATA output by the DATA writing module 11, so that the driving signal PWM _ DATA is more neatly arranged, the on/off of the driving module 13 is more accurately controlled, the light emitting of the light emitting unit 14 and the accurate control of the light emitting time are ensured, and the brightness adjustment accuracy of the light emitting unit 14 is improved. As shown in fig. 4, two inverters 151 may be provided in the inverter unit 15, and at this time, the output signal level state of the data writing block 11 coincides with the output signal level state of the inverter block 15.
Fig. 5 is a schematic diagram of another specific structure of the pixel driving circuit in fig. 1, and optionally, the pixel driving circuit may further include: a storage module 16; the storage module 16 includes a storage capacitor C; the first polar plate of the storage capacitor C is connected with the second input end of the comparison module 12; the second plate of the storage capacitor C is connected to the ground terminal.
The storage capacitor C is disposed at the second input terminal of the comparing module 12, so that when the data signal VDATA is inputted to the second input terminal of the comparing module 12, the storage capacitor C can store and hold the data signal VDATA, in a frame period of the display panel, the second input terminals of the comparing modules 12 are all inputted with the data signal VDATA, the reference voltage sweet is also a signal which is continuously inputted in a frame period, the comparing module 12 can compare the DATA signal VDATA with the reference voltage sweet during one frame period, continuously output the driving signal PWM _ DATA, the final brightness of the light emitting unit 14 is displayed by inputting the driving currents with different duty ratios to the light emitting unit 14 in one frame scanning period, so that the problem that the comparison module 12 does not output the driving signal PWM _ DATA in the latter half of one frame scanning period is avoided, and the display effect of the display panel is enhanced.
Next, describing the structure of the pixel driving circuit shown in fig. 2, as shown in fig. 2, optionally, a first input terminal of the comparing module 12 is connected to the reference voltage output terminal, and a second input terminal of the comparing module 12 is connected to the first terminal of the data writing module 11; the output end of the comparison module 12 is electrically connected with the control end of the driving module 13; the second end of the data writing module 11 is connected to the corresponding data line, and is configured to output the data signal of the corresponding data line to the comparing module 12.
The second end of the data writing module 11 is connected to the corresponding data line for obtaining the data signal VDATA, and the first end of the data writing module 11 is connected to the second input end of the comparing module 12. The DATA writing module 11 transmits the DATA signal VDATA to the second input terminal of the comparing module 12 under the control of the scanning signal GOUT, the first input terminal of the comparing module 12 is configured to receive the reference voltage SWEEP, and the comparing module 12 is capable of transmitting the driving signal PWM _ DATA to the control terminal of the driving module 13. In this embodiment, the driving current generated by the driving module 13 is only related to the driving signal PWM _ DATA, and the driving current is constant when the value of the driving signal PWM _ DATA is constant, and the duty ratio of the driving current is the same as the driving signal, so as to keep the light emitting efficiency of the light emitting unit 14 the same at any gray level, thereby improving the uniformity of the image display.
Fig. 6 is a schematic diagram showing a specific structure of the pixel driving circuit in fig. 2, and as shown in fig. 6, the data writing module 11 may optionally include a switching transistor T1; the driving module 13 includes a driving transistor T2; the control end of the switching transistor T1 is connected with the corresponding scan line; a first terminal of the switching transistor T1 is connected to a second input terminal of the comparison module 12; a second terminal of the switching transistor T1 is connected to the corresponding data line; the control terminal of the driving transistor T2 is electrically connected with the output terminal of the comparison module 12; a first terminal of the driving transistor T2 is connected to the first power supply output terminal PVDD; the second terminal of the driving transistor T2 is connected to the second power output terminal PVEE through the light emitting cell 14.
The data writing block 11 includes a switching transistor T1, and the driving block 13 includes a driving transistor T2. The control end of the switch transistor T1 is connected to the scan line for receiving the scan signal GOUT; the first end is connected to the second input end of the comparing module 12, the second end is connected to the corresponding DATA line, and is used for transmitting the DATA signal to the second input end of the comparing module 12 when the scan signal is scanned to the pixel driving circuit in the current row, and the driving signal PWM _ DATA of the comparing module 12 is output to the control end of the driving transistor T2. The first terminal of the driving transistor T2 is connected to the first power output terminal PVDD, and the second terminal of the driving transistor T2 is connected to the second power output terminal PVEE through the light emitting cell 14, so that the voltage across the light emitting cell 14 is the difference between the first power output terminal PVDD and the second power output terminal PVEE. Optionally, the comparison module 12 may comprise a comparator. According to the embodiment, the PWM signal with the data signal is acquired by building a hardware circuit, so that the light-emitting unit is kept in a high-efficiency state, and the power consumption of the panel is saved. Compared with the mode of adjusting the display brightness by adopting the algorithm to debug the power supply PWM signal, the problem that the power supply PWM signal increases power consumption for improving the brightness under low efficiency is avoided, meanwhile, the problem that the light emitting units emit light unevenly under different gray scale pictures cannot be generated, the mode of adjusting the display brightness by adopting the algorithm to debug the power supply PWM signal cannot ensure the brightness uniformity of the display device, and the adjusting effect is poor.
Fig. 7 is a schematic diagram of a specific structure of the pixel driving circuit in fig. 2, as shown in fig. 7, optionally, the pixel driving circuit may further include: an inverter module 15; the inverter module 15 includes one or more inverters 151 connected in sequence; the output end of the comparison module 12 is connected with the control end of the driving module 13 through an inverter module 15. Similarly, in this embodiment, an inverter module 15 is disposed between the data writing module 11 and the driving module 13, and the inverter unit 15 includes at least one inverter 151 connected in sequence. The at least one inverter 151 connected in sequence can adjust the waveform of the driving signal PWM _ DATA output by the DATA writing module 11, so that the driving signal PWM _ DATA is more neatly arranged, the on/off of the driving module 13 is more accurately controlled, and the light emitting unit 14 is ensured to emit light and the light emitting time is accurately controlled. As shown in fig. 7, two inverters 151 may be provided in the inverter unit 15, and at this time, the output signal level state of the data writing block 11 coincides with the output signal level state of the inverter block 15.
Fig. 8 is a schematic diagram of a specific structure of the pixel driving circuit in fig. 2, and as shown in fig. 8, the pixel driving circuit may further include: a storage module 16; the storage module 16 includes a storage capacitor C; the first polar plate of the storage capacitor C is connected with the second input end of the comparison module 12; the second plate of the storage capacitor C is connected to the ground terminal. The comparison module 12 can compare the DATA signal VDATA with the reference voltage sweet in one frame scanning period, and continuously output the driving signal PWM _ DATA, so as to input driving currents with different duty ratios to the light emitting unit 14 in one frame scanning period, display the final brightness of the light emitting unit 14, avoid the problem that the comparison module 12 does not output the driving signal PWM _ DATA in the latter half of one frame scanning period, and enhance the display effect of the display panel.
Fig. 9 is a waveform diagram of a reference voltage according to an embodiment of the present invention, and fig. 10 is a waveform diagram of another reference voltage according to an embodiment of the present invention. Optionally, in a line period of the frame scanning period, the image of the reference voltage sweet is an inclined line with a slope of a first fixed slope; the first fixed slope is positive or negative. In this embodiment, the reference voltage sweet is a ramp voltage in one row period, and the voltage-time curve is an inclined line with a fixed slope. The slope may be a first fixed slope, as shown in fig. 9, which is a positive number, or as shown in fig. 10, which is a negative number, which is not limited in this embodiment. When the comparison module 12 compares the reference voltage sweet and the data signal VDATA, there is a time t1 at which the reference voltage sweet and the data signal VDATA of the current pixel driving circuit are equal, and the duty ratio of the driving signal can be adjusted when the values of the data signal VDATA are different as the time of PWM transition. The white state voltage shown in fig. 9 and 10 is the maximum value achievable for the data signal VDATA. Illustratively, as shown in fig. 11, fig. 11 is a schematic diagram of driving signals with different duty ratios provided by an embodiment of the present invention. When the reference voltage sweet is greater than the DATA signal VDATA, the driving signal PWM _ DATA is at a high level, and when the DATA signal VDATA suddenly becomes smaller, the active pulse Th2 of the driving signal PWM _ DATA is wider than the initial active pulse Th1 of the driving signal PWM _ DATA, and the variation of the duty ratio causes the light emitting luminance of the light emitting cells 14 to be different.
Optionally, the comparing module 12 is specifically configured to: when the data signal VDATA is higher than the reference voltage SWEEP, outputting a driving signal PWM _ VDATA with a first fixed amplitude; when the data signal VDATA is lower than the reference voltage SWEEP, outputting a driving signal PWM _ VDATA with a second fixed amplitude; or, when the data signal VDATA is higher than the reference voltage sweet, outputting a driving signal PWM _ VDATA of a second fixed amplitude; when the data signal VDATA is lower than the reference voltage SWEEP, outputting a driving signal PWM _ VDATA with a first fixed amplitude; the first fixed amplitude is greater than the second fixed amplitude.
In this embodiment, for the reference voltage sweet in fig. 9 and 10, it may be set that when the data signal VDATA is higher than the reference voltage sweet, the driving signal PWM _ VDATA with the first fixed amplitude is output, and when the data signal VDATA is lower than the reference voltage sweet, the driving signal PWM _ VDATA with the second fixed amplitude is output. The first fixed amplitude may be greater than the second fixed amplitude, that is, the first fixed amplitude may be a fixed low-level signal, and the second fixed amplitude may be a fixed high-level signal.
Alternatively, for the reference voltage sweet in fig. 9 and 10, it may be set that when the data signal VDATA is higher than the reference voltage sweet, the second fixed-amplitude driving signal PWM _ VDATA is output; when the data signal VDATA is lower than the reference voltage sweet, the driving signal PWM _ VDATA of the first fixed amplitude is output. In this example, the first fixed amplitude is also greater than the second fixed amplitude.
In this embodiment, the magnitude relationship between the data signal VDATA and the reference voltage sweet can be arbitrarily combined with the case that the comparing module 12 outputs the high level signal or the low level signal, for example, when the data signal VDATA is greater than the reference voltage sweet, the comparing module 12 can output the high level signal or output the low level signal. In this embodiment, the amplitude of the driving signal PWM _ VDATA input to the driving module by the comparing module 12 is constant, and only the duty ratio is different, so that the light emitting efficiency is the same under different gray scales of the image, the problem of uneven brightness of the image is not generated, and the problem of excessive power consumption caused by increasing the amplitude of the driving signal to improve the light emitting efficiency is also avoided.
As shown in fig. 12, fig. 12 is a waveform diagram of the pixel driving circuit provided in the embodiment of the invention in one frame scanning period. In one line period in each frame scanning period, the reference voltage SWEEP in this embodiment is a ramp signal. In each frame period, each pixel driving circuit receives a data signal VDATA as a fixed value. However, the reference voltage SWEEP is a ramp in one line period, and the reference voltage SWEEP forms a triangular wave-like form in one frame period. Referring to fig. 5 and 8, since the data signal VDATA is always maintained at the second input terminal of the comparing module 12 of the pixel driving circuit after being scanned by the current row scanning signal GOUT, the pixel driving circuit drives the light emitting unit 14 in each row period of the frame scanning period after the row period. The light emitting unit 14 is continuously lighted by the dispersed pulses in the whole frame scanning period, and the driving current is constant, the light emitting efficiency is the same, and the problem of uneven brightness of the picture is not generated.
Fig. 13 is a waveform diagram of a reference voltage according to an embodiment of the present invention, and fig. 14 is a waveform diagram of another reference voltage according to an embodiment of the present invention. Optionally, in a frame scanning period, the image of the reference voltage sweet is an inclined line with a slope of a second fixed slope; the second fixed slope is positive or negative.
In this embodiment, the reference voltage sweet is a ramp voltage in one frame of the scan period, and the voltage-time curve is an inclined line with a fixed slope. The slope may be set to be a second fixed slope, as shown in fig. 13, which is a positive number, or as shown in fig. 14, which is a negative number, which is not limited in this embodiment. When the comparison module 12 compares the reference voltage sweet and the data signal VDATA, there is a time t1 at which the reference voltage sweet and the data signal VDATA of the current pixel driving circuit are equal, and the duty ratio of the driving signal can be adjusted when the values of the data signal VDATA are different as the time of PWM transition. Unlike the reference voltages in fig. 9 and 10, in this embodiment, in one frame scanning period, there is not an active pulse in each line period, but in the frame period, the front period is an active pulse, or the rear period is an active pulse. However, the luminance uniformity can be maintained while the corresponding luminance is displayed according to the data signal VDATA with the drive current kept constant.
Optionally, the comparing module 12 is specifically configured to: when the data signal VDATA is higher than the reference voltage SWEEP, outputting a driving signal PWM _ VDATA with a third fixed amplitude; when the data signal VDATA is lower than the reference voltage SWEEP, outputting a driving signal PWM _ VDATA with a fourth fixed amplitude; or, when the data signal VDATA is higher than the reference voltage sweet, outputting a fourth driving signal PWM _ VDATA of fixed amplitude; when the data signal VDATA is lower than the reference voltage SWEEP, outputting a driving signal PWM _ VDATA with a third fixed amplitude; the third fixed amplitude is greater than the fourth fixed amplitude.
In this embodiment, for the reference voltage sweet in fig. 13 and 14, it may be set that when the data signal VDATA is higher than the reference voltage sweet, the third fixed-amplitude driving signal PWM _ VDATA is output, and when the data signal VDATA is lower than the reference voltage sweet, the fourth fixed-amplitude driving signal PWM _ VDATA is output. The third fixed amplitude may be a fixed low-level signal, and the fourth fixed amplitude may be a fixed high-level signal.
Alternatively, for the reference voltage sweet in fig. 13 and 14, it may be set that when the data signal VDATA is higher than the reference voltage sweet, the fourth fixed-amplitude driving signal PWM _ VDATA is output; when the data signal VDATA is lower than the reference voltage sweet, the driving signal PWM _ VDATA of the third fixed amplitude is output. In this example, the third fixed amplitude is also greater than the fourth fixed amplitude.
In this embodiment, the magnitude relationship between the data signal VDATA and the reference voltage sweet can be arbitrarily combined with the case that the comparing module 12 outputs the high level signal or the low level signal, for example, when the data signal VDATA is greater than the reference voltage sweet, the comparing module 12 can output the high level signal or output the low level signal. In this embodiment, the amplitude of the driving signal PWM _ VDATA input to the driving module by the comparing module 12 is constant, and only the duty ratio is different, so that the light emitting efficiency is the same under different gray scales of the image, the problem of uneven brightness of the image is not generated, and the problem of excessive power consumption caused by increasing the amplitude of the driving signal to improve the light emitting efficiency is also avoided.
As shown in fig. 15, fig. 15 is a waveform diagram of the pixel driving circuit provided in the embodiment of the invention in one frame scanning period. In each frame scanning period, the reference voltage SWEEP in this embodiment is a ramp signal. In each frame period, each pixel driving circuit receives a data signal VDATA as a fixed value. Referring to fig. 5 and 8, since the data signal VDATA is always maintained at the second input terminal of the comparison module 12 of the pixel driving circuit after being scanned by the current row scanning signal GOUT, there may be some row periods before the pixel driving circuit does not light the light emitting unit 14, but then the reference voltage sweet is decreased to be the same as the data signal VDATA, the driving signal PWM _ VDATA makes a transition from low level to high level, and then the pixel driving circuit keeps lighting the light emitting unit 14 every row period after the row in the frame scanning period, forming a wider effective pulse. The driving current of the light emitting unit 14 is the same in the whole frame scanning period, the light emitting efficiency is the same, and the problem of uneven brightness of the picture is not generated.
Based on the same concept, the embodiment of the invention also provides a driving method of the pixel driving circuit. Fig. 16 is a flowchart illustrating a driving method of a pixel driving circuit according to an embodiment of the present invention, and as shown in fig. 16, the method of the present embodiment includes the following steps:
s101, outputting a reference voltage to a comparison module by a reference voltage output end; inputting a scanning signal to the data writing module by a corresponding scanning line, wherein the potential of the scanning signal is an effective potential; the potential of the corresponding data line output data signal is the effective potential.
And S102, comparing the reference voltage with the data signal by the comparison module, and outputting driving signals with different duty ratios according to the comparison structure.
Step S103, the data writing module outputs the data signal of the corresponding data line to the comparison module or outputs the driving signal output by the comparison module to the driving module in response to the scan line provided by the corresponding scan line.
And step S104, the control end of the driving module acquires a driving signal and drives the light-emitting unit under the control of the driving signal.
In the embodiment of the invention, the pixel driving circuit comprises a data writing module, a comparison module and a driving module, wherein the comparison module can compare a reference voltage output by a reference voltage output end with a data signal of a data line and output driving signals with different duty ratios according to a comparison result, the data writing module is used for writing the data signal into an input end of the comparison module or sending the driving signals with different duty ratios output by the comparison module to a control end of the driving module, and the driving module provides current for the light emitting unit under the control of the driving signals so as to enable the light emitting unit to emit light. The driving module drives the light-emitting unit with constant driving current, the brightness of the light-emitting unit is adjusted only by adjusting the duty ratio of the driving signal, the problem of uneven light emission of the light-emitting unit under different gray scales of a picture cannot be caused due to constant driving current, and the uniformity of display brightness is ensured. In addition, the reference voltage output end is an internal terminal of the display device, the reference voltage and the data signal come from the same driving chip, and the driving chip can be self-synchronized without coordination, so that the brightness adjustment structure of the light-emitting unit is simple and high in feasibility.
On the basis of the above embodiment, the comparing module compares the reference voltage with the data signal, and outputs the driving signals with different duty ratios according to the comparing structure, including: when the data signal is higher than the reference voltage, outputting a driving signal with a fifth fixed amplitude; when the data signal is lower than the reference voltage, outputting a driving signal with a sixth fixed amplitude; or when the data signal is higher than the reference voltage, outputting a driving signal with a sixth fixed amplitude; when the data signal is lower than the reference voltage, outputting a driving signal with a fifth fixed amplitude; the fifth fixed amplitude is greater than the sixth fixed amplitude. In this embodiment, the amplitude of the driving signal PWM _ VDATA input to the driving module by the comparing module is constant, and only the duty ratio is different, so that the light emitting efficiency is the same under different gray scales of the picture, the problem of uneven brightness of the picture is not generated, and the problem of excessive power consumption caused by increasing the amplitude of the driving signal to improve the light emitting efficiency is also avoided.
The embodiment of the invention also provides a display panel. Fig. 17 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and as shown in fig. 17, the display panel according to the embodiment of the present invention includes a pixel driving circuit (not shown in fig. 17) according to any embodiment of the present invention;
further comprising: a light emitting unit 14 provided corresponding to the pixel driving circuit; the pixel driving circuit is used for driving the corresponding light emitting unit to emit light 14.
The display panel in the embodiment of the present invention includes the technical features of the pixel driving circuit provided in any embodiment of the present invention, and has the beneficial effects of the corresponding technical features, which are not described herein again. The display panel of the embodiment can be applied to a mobile phone, a computer, a television, an intelligent wearable device, and the like, and the embodiment is not particularly limited thereto.
Optionally, the light emitting unit is a micro-LED chip or a Mini-LED chip, the embodiment adjusts the brightness of the micro-LED chip or the Mini-LED chip by the driving current with the variable duty ratio and the constant amplitude, and combines the constant current driving mode with the micro-LED technology, so as to ensure the uniformity of the display brightness of the micro-LED, avoid the problem of uneven light emission of the micro-LED chip or the Mini-LED chip under different gray scales, and improve the display quality of the micro-LED panel.
Optionally, the display panel may further include: a driver chip 17; the driving chip 17 is used for outputting a reference voltage, a data signal and a scan signal to the pixel driving circuit. The reference voltage is an internal output signal of the display device and comes from the same driving chip as display signals such as a data signal and a scanning signal, so that the output reference voltage can be automatically synchronous with the data signal and the scanning signal without coordination, and the brightness adjustment structure of the light-emitting unit is simple and has high feasibility.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (17)
1. A pixel driving circuit, comprising: the device comprises a data writing module, a comparison module and a driving module;
the comparison module responds to a reference voltage output by a reference voltage output end and a data voltage corresponding to a data line and outputs driving signals with different duty ratios according to a comparison result of the reference voltage and the data voltage;
the control end of the data writing module is connected with the corresponding scanning line; the first end of the data writing module is connected with the comparison module; the data writing module is used for responding to a scanning signal provided by a corresponding scanning line, outputting a data signal of the corresponding data line to the comparison module or outputting a driving signal output by the comparison module to the driving module;
the control end of the driving module acquires the driving signal; the first end of the driving module is connected with the first power supply output end; and the second end of the driving module is connected with the second power output end through the light-emitting unit so as to drive the light-emitting unit.
2. The pixel driving circuit according to claim 1, wherein a first input terminal of the comparing module is connected to the reference voltage output terminal, and a second input terminal of the comparing module is connected to a corresponding data line; the output end of the comparison module is connected with the first end of the data writing module;
and the second end of the data writing module is electrically connected with the control end of the driving module and is used for transmitting the driving signal to the driving module.
3. The pixel driving circuit according to claim 2, wherein the data writing module comprises a switching transistor; the driving module comprises a driving transistor;
the control end of the switch transistor is connected with the corresponding scanning line; the first end of the switching transistor is connected with the output end of the comparison module; the second end of the switch transistor is electrically connected with the control end of the driving transistor;
the first end of the driving transistor is connected with the first power supply output end; and the second end of the driving transistor is connected with the second power supply output end through the light-emitting unit.
4. The pixel driving circuit according to claim 2, further comprising: an inverter module; the reverser module comprises one or more reversers which are connected in sequence;
and the second end of the data writing module is connected with the control end of the driving module through the reverser module.
5. The pixel driving circuit according to claim 1,
a first input end of the comparison module is connected with the reference voltage output end, and a second input end of the comparison module is connected with a first end of the data writing module; the output end of the comparison module is electrically connected with the control end of the driving module;
and the second end of the data writing module is connected with the corresponding data line and used for outputting the data signal of the corresponding data line to the comparison module.
6. The pixel driving circuit according to claim 5, wherein the data writing module comprises a switching transistor; the driving module comprises a driving transistor;
the control end of the switch transistor is connected with the corresponding scanning line; the first end of the switching transistor is connected with the second input end of the comparison module; the second end of the switch transistor is connected with the corresponding data line;
the control end of the driving transistor is electrically connected with the output end of the comparison module; the first end of the driving transistor is connected with the first power supply output end; and the second end of the driving transistor is connected with the second power supply output end through the light-emitting unit.
7. The pixel driving circuit according to claim 5, further comprising: an inverter module; the reverser module comprises one or more reversers which are connected in sequence;
the output end of the comparison module is connected with the control end of the driving module through the reverser module.
8. The pixel driving circuit according to claim 2 or 5, further comprising: a storage module; the storage module comprises a storage capacitor;
the first polar plate of the storage capacitor is connected with the second input end of the comparison module; and the second plate of the storage capacitor is connected with the ground terminal.
9. The pixel driving circuit according to claim 1, wherein the image of the reference voltage is a slope line with a first fixed slope in one line period of a frame scanning period; the first fixed slope is a positive or negative number.
10. The pixel driving circuit according to claim 9, wherein the comparing module is specifically configured to:
when the data signal is higher than the reference voltage, outputting a driving signal with a first fixed amplitude; when the data signal is lower than the reference voltage, outputting a driving signal with a second fixed amplitude; alternatively, the first and second electrodes may be,
outputting a driving signal of a second fixed amplitude when the data signal is higher than the reference voltage; when the data signal is lower than the reference voltage, outputting a driving signal with a first fixed amplitude;
the first fixed amplitude is greater than the second fixed amplitude.
11. The pixel driving circuit according to claim 1, wherein the image of the reference voltage is a slope line with a second fixed slope in one frame period; the second fixed slope is a positive or negative number.
12. The pixel driving circuit according to claim 11, wherein the comparing module is specifically configured to:
outputting a driving signal of a third fixed amplitude when the data signal is higher than the reference voltage; outputting a driving signal of a fourth fixed amplitude when the data signal is lower than the reference voltage; alternatively, the first and second electrodes may be,
outputting a driving signal of a fourth fixed amplitude when the data signal is higher than the reference voltage; outputting a driving signal of a third fixed amplitude when the data signal is lower than the reference voltage;
the third fixed amplitude is greater than the fourth fixed amplitude.
13. A driving method of a pixel driving circuit, which is applied to the pixel driving circuit according to any one of claims 1 to 12, comprising:
the reference voltage output end outputs reference voltage to the comparison module; inputting a scanning signal to the data writing module by a corresponding scanning line, wherein the potential of the scanning signal is an effective potential; the potential of the data signal output corresponding to the data line is an effective potential;
the comparison module compares the reference voltage with the data signal and outputs driving signals with different duty ratios according to a comparison structure;
the data writing module responds to a scanning line provided by a corresponding scanning line, and outputs a data signal of the corresponding data line to the comparison module or outputs a driving signal output by the comparison module to the driving module;
and the control end of the driving module acquires the driving signal and drives the light-emitting unit under the control of the driving signal.
14. The driving method of the pixel driving circuit according to claim 13, wherein the comparing module compares the reference voltage with the data signal and outputs the driving signals with different duty ratios according to a comparison structure, comprising:
outputting a driving signal with a fifth fixed amplitude when the data signal is higher than the reference voltage; when the data signal is lower than the reference voltage, outputting a driving signal with a sixth fixed amplitude; alternatively, the first and second electrodes may be,
when the data signal is higher than the reference voltage, outputting a driving signal with a sixth fixed amplitude; outputting a driving signal with a fifth fixed amplitude when the data signal is lower than the reference voltage;
the fifth fixed amplitude is greater than the sixth fixed amplitude.
15. A display panel comprising the pixel drive circuit according to any one of claims 1 to 12; further comprising:
a light emitting unit provided corresponding to the pixel driving circuit; the pixel driving circuit is used for driving the corresponding light-emitting unit to emit light.
16. The display panel according to claim 15, wherein the light emitting unit is a micro-LED chip or a Mini-LED chip.
17. The display panel according to claim 15, further comprising: a driving chip; the driving chip is used for outputting a reference voltage, the data signal and the scanning signal to the pixel driving circuit.
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