CN116030768A - Light-emitting substrate, driving method thereof and display device - Google Patents
Light-emitting substrate, driving method thereof and display device Download PDFInfo
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Abstract
The application discloses a light-emitting substrate, a driving method thereof and a display device, which are used for solving the problem of flickering of the light-emitting substrate. The embodiment of the application provides a luminescent substrate, luminescent substrate includes: a plurality of light emitting areas arranged in an array; each light-emitting area comprises a driving chip and at least one light-emitting unit electrically connected with the driving chip; the driving chip includes: the brightness data determining module is used for determining brightness data of the current frame luminous area; the logic control module is electrically connected with the brightness data determining module and is used for: generating a pulse width modulation signal and a driving signal of a light emitting unit corresponding to the pulse width modulation signal according to the brightness data of the current frame, and outputting the driving signal at a preset moment; the pulse width modulated signal comprises a plurality of first sub-pulses; the driving signal comprises a plurality of second sub-pulses, and the second sub-pulses correspond to the first sub-pulses; the preset time is the starting time of the first sub-pulse.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a light emitting substrate, a driving method thereof, and a display device.
Background
Currently, display devices are evolving toward high contrast, high color gamut, high frame rate, and low power consumption. Especially, a display device using a mini light emitting diode (mini-LED) as a light source has great advantages in both high contrast and high color gamut directions.
However, in the prior art, a pulse modulation method (PulseWidthModulation, PWM) is generally used to control the light emission of the mini-LED, that is, the display brightness is controlled by adjusting the ratio of the time when the constant period digital signal is output to the high level and the low level, but the control method is prone to the technical problem of backlight flicker.
Disclosure of Invention
The embodiment of the application provides a light-emitting substrate, a driving method thereof and a display device, which are used for solving the problem of flickering of the light-emitting substrate.
The embodiment of the application provides a luminescent substrate, luminescent substrate includes: a plurality of light emitting areas arranged in an array; each light-emitting area comprises a driving chip and at least one light-emitting unit electrically connected with the driving chip; the driving chip includes:
the brightness data determining module is used for determining brightness data of the current frame luminous area;
the logic control module is electrically connected with the brightness data determining module and is used for: generating a pulse width modulation signal and a driving signal of a light emitting unit corresponding to the pulse width modulation signal according to the brightness data of the current frame, and outputting the driving signal at a preset moment; the pulse width modulation signal comprises a plurality of first sub-pulses, the driving signal comprises a plurality of second sub-pulses, and the second sub-pulses correspond to the first sub-pulses; the preset time is the starting time of the first sub-pulse.
In some embodiments, the logic control module comprises:
the data processing control unit is electrically connected with the brightness data determining module and is used for generating a pulse width control signal according to the brightness data;
a clock signal receiving unit for receiving a clock signal;
the pulse width modulation unit is electrically connected with the data processing control unit and is used for generating a pulse width modulation signal according to the pulse control signal;
the driving signal generating unit is electrically connected with the pulse width modulation unit and the brightness data determining module and is used for generating a driving signal according to the brightness data and the pulse width modulation signal;
and the driving signal updating unit is electrically connected with the clock signal receiving unit and the driving signal generating unit and is used for responding to the clock signal and outputting a driving signal at a preset moment.
In some embodiments, the driving signal generating unit specifically includes: a first operational amplifier, and a first switching transistor;
the first input end of the first operational amplifier is used for inputting brightness data, the second input end of the first operational amplifier is electrically connected with the source electrode of the first switching transistor, the output end of the first operational amplifier is electrically connected with the grid electrode of the first switching transistor, the first power end of the first operational amplifier is electrically connected with the pulse width modulation unit, and the second power end of the first operational amplifier is electrically connected with the first constant voltage power end;
the source electrode of the first switch transistor is grounded, and the drain electrode of the first switch transistor is electrically connected with the drive signal updating unit.
In some embodiments, the pulse width control signal update module comprises: an inverter and an N-type transistor;
the input end of the inverter is electrically connected with the clock signal receiving unit, the first power end of the inverter is electrically connected with the low-level signal end, the second power end of the inverter is electrically connected with the high-level signal end, and the output end of the inverter is electrically connected with the grid electrode of the N-type transistor;
the source electrode of the N-type transistor is electrically connected with the drain electrode of the first transistor, and the drain electrode of the N-type transistor is used for outputting a driving signal.
In some embodiments, the pulse width modulated signal includes each first sub-pulse having an equal duration and the drive signal includes each second sub-pulse having an equal duration.
In some embodiments, the preset time is the start time of the first sub-pulse after the generation of the drive signal.
In some embodiments, the first sub-pulse includes a first level signal and a second level signal applied sequentially;
the driving signal comprises a plurality of second sub-pulses, the second sub-pulses correspond to the first sub-pulses, and the second sub-pulses comprise a third level signal and a fourth level signal which are sequentially applied;
the first level signal and the third level signal are high level signals, and the second level signal and the fourth level signal are low level signals.
In some embodiments, the light emitting unit includes at least one micro-sized inorganic light emitting diode device.
According to the driving method of the light-emitting substrate, the light-emitting substrate comprises a plurality of light-emitting areas which are arranged in an array; the light emitting region includes at least one light emitting unit, and the driving method includes:
determining brightness data of a light-emitting area of a current frame;
generating a pulse width modulation signal and a driving signal of a light emitting unit corresponding to the pulse width modulation signal according to brightness data of a current frame; the pulse width modulation signal comprises a plurality of first sub-pulses, the driving signal comprises a plurality of second sub-pulses, and the second sub-pulses correspond to the first sub-pulses;
updating the driving signal at a preset time; the preset time is the starting time of the first sub-pulse.
The display device provided in the embodiment of the application includes: the embodiment of the application provides a light-emitting substrate and a display panel positioned on the light-emitting side of the light-emitting substrate.
According to the light-emitting substrate, the driving method of the light-emitting substrate and the display device, the pulse width modulation signal determined by the driving chip comprises a plurality of first sub-pulses, the driving signal of the light-emitting unit corresponds to the pulse width modulation signal, and the driving signal corresponding to one frame of brightness data consists of a plurality of second sub-pulses. Under the condition that the total duration of a frame of pulse width modulation signal and a driving signal is not changed, the refreshing frequency of the first sub-pulse is larger than the refreshing frequency of one pulse of the pulse width modulation signal in the related art, and correspondingly, the refreshing frequency of the driving signal can be provided, so that a visible Flicker can be avoided. In addition, as the brightness data is not refreshed in a subframe mode, the design difficulty and cost of the control module of the light-emitting substrate can be prevented from being increased. In addition, after the logic control module included in the driving chip obtains the current frame brightness data to generate the driving signal, the driving signal is updated at the starting time of the first sub-pulse, so that the periodicity of the driving signal output by the driving chip DIMMER can be ensured, invisible Flicker caused by the periodicity of the driving signal being damaged is avoided, and the influence on the eyesight and nerve health of a user is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a light-emitting substrate according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a driving chip according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a driving signal according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a cause of generating invisible Flicker according to an embodiment of the present application;
FIG. 5 is a schematic diagram of another cause of invisible Flicker provided by embodiments of the present application;
fig. 6 is a schematic diagram of a driving signal update time in a driving method of a light emitting substrate according to an embodiment of the present application;
fig. 7 is a schematic diagram of a driving signal update timing in a driving method of a light emitting substrate according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of another driving chip according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of another driving chip according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a logic control module in a driving chip according to an embodiment of the present application;
fig. 11 is a flow chart of a driving method of a light emitting substrate according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present application. And embodiments and features of embodiments in this application may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art without the benefit of the present disclosure, are intended to be within the scope of the present application based on the described embodiments.
Unless otherwise defined, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
It should be noted that the dimensions and shapes of the various figures in the drawings do not reflect true proportions, and are intended to illustrate the present application only. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
In the related art, one of the ways to control the light emitting device of the light emitting substrate is pulse width modulation (Pulse Width Modulation, PWM) which indicates luminance data by repeating high level/low level and using the length of the high level section, but each frame corresponds to only one pulse of the PWM signal. Thus, when the light emitting substrate is applied to a display product, flicker (referred to as visual Flicker) observable by human eyes occurs when the refresh frequency of the unit frame is slow. One of the solutions for the visual Flicker in the related art is to use dc current control when controlling the display brightness under a specific constant system with low gray scale, but this method needs to ensure the accuracy of dc current control, which is not easy to be implemented. Another way to solve the visual Flicker is to increase the refresh rate by dividing the unit frame into subframes for transmission, but this way requires the refresh rate of the clock signal to be designed very fast, so the complexity of the hardware becomes large and the size increases, resulting in an increase in cost. Also, when the light emitting substrate is applied to a display product, there may be invisible flickers in addition to the visible flickers. Invisible flickers may be defined as flickers that, although not visible to the naked eye, are viewable through the lens of a display product camera. The presence of invisible flickers has an impact on the vision and neurological health of the user.
The embodiment of the application provides a light-emitting substrate, as shown in fig. 1, the light-emitting substrate includes: a plurality of light emitting areas 1 arranged in an array; each light emitting region 1 includes a driving chip diode and at least one light emitting unit 4 electrically connected to the driving chip diode;
as shown in fig. 2, the driver chip diode includes:
a brightness data determining module 01, configured to determine brightness data of a light emitting area of a current frame;
the logic control module 02 is electrically connected with the brightness data determining module and is used for: generating a pulse width modulation signal and a driving signal of a light emitting unit corresponding to the pulse width modulation signal according to the brightness data of the current frame, and outputting the driving signal at a preset moment; as shown in fig. 3, the pulse width modulation signal P1 includes a plurality of first sub-pulses P', and the driving signal includes a plurality of second sub-pulses, where the second sub-pulses correspond to the first sub-pulses; the preset time is the starting time of the first sub-pulse.
The light-emitting substrate provided by the embodiment of the application, the pulse width modulation signal determined by the driving chip comprises a plurality of first sub-pulses, the driving signal of the light-emitting unit corresponds to the pulse width modulation signal, and the driving signal corresponding to one frame of brightness data consists of a plurality of second sub-pulses. Under the condition that the total duration of a frame of pulse width modulation signal and a driving signal is not changed, the refreshing frequency of the first sub-pulse is larger than the refreshing frequency of one pulse of the pulse width modulation signal in the related art, and correspondingly, the refreshing frequency of the driving signal can be provided, so that a visible Flicker can be avoided. In addition, as the brightness data is not refreshed in a subframe mode, the design difficulty and cost of the control module of the light-emitting substrate can be prevented from being increased. In addition, after the logic control module included in the driving chip obtains the current frame brightness data to generate the driving signal, the driving signal is updated at the starting time of the first sub-pulse, so that the periodicity of the driving signal output by the driving chip DIMMER can be ensured, invisible Flicker caused by the periodicity of the driving signal being damaged is avoided, and the influence on the eyesight and nerve health of a user is avoided.
In some embodiments, as shown in fig. 1, the light emitting substrate further includes a first control module DCON; the first control module DCON is electrically connected with a driving chip DIMMER which is included in the plurality of light emitting areas;
the first control module DCON is configured to: and sending a communication signal corresponding to the brightness data of the current frame light emitting area to a driving chip DIMMER.
Correspondingly, the brightness data determining module is used for determining brightness data of the current frame light-emitting area, and specifically comprises the following steps: and processing the communication signal to obtain the brightness data of the light-emitting area of the current frame. In a specific implementation, for example, the luminance data determining module demodulates the communication signal to obtain communication data, and processes the communication data to obtain a data frame (for example, frame frequency data), that is, luminance data. Wherein, the communication data may be data reflecting a light emitting duration of the light emitting unit. The light emitting time length required by the light emitting unit connected with the driving chip DIMMER can be known according to the data frame, so that the logic control module generates a corresponding pulse width control signal based on the light emitting time length.
In some embodiments, as shown in fig. 3, the first sub-pulse P' includes a first level signal H1 for a first period t2 and a second level signal L1 for a second period t3, which are sequentially applied, the first level signal H1 being a high level signal and the second level signal L1 being a low level signal.
Correspondingly, the second sub-pulse comprises a third level signal and a fourth level signal which are sequentially applied, wherein the third level signal is a high level signal, and the fourth level signal is a low level signal.
In particular, the luminance data is data reflecting a light emission period of the light emitting unit, and thus, a pulse width control signal is generated according to the luminance data, and a pulse width modulation signal generated according to the pulse width control signal corresponds to the light emission period required by the light emitting unit. The driving signal is matched with the pulse width modulation signal, and a plurality of second sub-pulses included in the driving signal correspond to a plurality of first sub-pulses included in the pulse width modulation signal. Therefore, the driving signal generated under the control of the pulse width modulation signal may reflect the light emission duration required for the light emitting unit. Under the condition of ensuring the periodicity of the driving signals, the number of the first sub-pulses is the same as the number of the second sub-pulses in the driving signals and the pulse width modulation signals corresponding to the luminance data of the current frame, the duration of the third level signal is the same as the duration of the first level signal, and the duration of the fourth level signal is the same as the duration of the second level signal.
In an implementation, the plurality of driving chips dim receive luminance data from the first control module DCON on a unit frame basis. At this time, the first control module DCON and the plurality of driving chips DIMMER operate in independent asynchronous states, and thus it is difficult to ensure the periodicity of the driving signals. For example, as shown in fig. 4, the frame data update time, that is, the luminance data update time is t '1, and t'1 is earlier than the start time t '2 of the second sub-pulse of the driving signal in the normal period, if the driving signal is updated at the time t'1, the duration t3 'of the b-section of the driving signal before the time t'1 is smaller than the complete duration t3 of the low-level signal in the second sub-pulse in the normal period; as shown in fig. 5, t '1 is later than the start time t '2 of the second sub-pulse of the driving signal, if the driving signal is updated at time t '1, the duration t3' of the b interval of the driving signal before time t '1 is longer than the complete duration t3 of the low-level signal in the second sub-pulse of the normal period; both the cases shown in fig. 4 and 5 destroy the periodicity of the drive signal, resulting in invisible Flicker. Since the first control module DCON and the plurality of driving chips DIMMER operate in independent asynchronous states, it is difficult to ensure that the timing of updating the driving signal after receiving the frame data is the start timing of the first sub-pulse. In addition, when the brightness of the light emitting area is low gray scale, the time of the low level signal is relatively longer than that of the high gray scale, so that the invisible Flicker caused by the non-periodicity of the driving signal corresponding to the low gray scale is more obvious.
It should be noted that, as shown in fig. 6 and 7, the current frame brightness data is updated at time t '1 and a driving signal is generated, and the driving signal is updated at time t'2, and even if t '1 and t'2 are different times, each driving chip dim updates the driving signal including a plurality of second sub-pulses according to the operation clock matched with the duration of the first sub-pulse, so that the output of the invisible Flicker caused by the aperiodic driving signal can be avoided.
In a specific implementation, if the refresh frequency of the unit frame is 60 hertz (Hz), that is, the refresh frequency of the pwm signal is 60Hz, the number of the first sub-pulses included in the pwm signal and the refresh frequency of the first sub-pulses are as shown in table one. An improvement in refresh frequency can be achieved as long as a plurality of subframes are included, compared to a pulse width modulation signal including only one pulse and having a refresh frequency of 60Hz in the related art.
Table one:
in implementation, according to table one, the greater the number of first sub-pulses, the higher the refresh frequency of the first sub-pulses, and accordingly the more advantageous to avoid visual Flicker. The number of first sub-pulses may be set according to actual needs. The number of first sub-pulses may be set, for example, according to the refresh frequency that the driver chip can achieve.
In some embodiments, as shown in fig. 3, the duration t1 of each first sub-pulse P' included in the pulse width modulated signal P1 is equal.
It should be noted that, as shown in fig. 3, the duration of the first level signal H1 is t2 and the duration of the second level signal L1 is t3, different brightnesses may be achieved by adjusting the duty ratios of t2 and t3, for example, in fig. 2, t2=t3, that is, the duration of the first level signal H1 is t2 and the duration of the second level signal L1 is t3 each accounting for 50% of the duration t1 of the first sub-pulse P', and the gray scale of the light emitting area corresponding to the pulse width modulated signal is 50%. If the gray level of the light emitting area is greater than 50%, t2 is greater than t3, and if the gray level of the light emitting area is less than 50%, t2 is less than t3.
It should be noted that, in the plurality of first sub-pulses P' included in the pwm signal P1, the duration t2 of the first level signal H1 is equal, and the duration t3 of the second level signal L1 is equal. If the pwm signal includes N first sub-pulses, the total duration of the first level signal H1 of the pwm signal is n×t2, the total duration of the second level signal L1 is n×t3, the duration t4=nxt1 of the pwm signal, the total duty ratio n×t2/t4 of the first level signal H1 is still t2/t1, and the total duty ratio n×t3/t4 of the second level signal L1 is still t3/t1, that is, the light emitting substrate provided in this embodiment of the present application divides the pwm signal into a plurality of first sub-pulses, so that the refresh frequency of the first sub-pulses can be improved without changing the total duty ratio of the high level signal and the low level signal, that is, while maintaining the brightness of the light emitting area.
In some embodiments, the preset time is the start time of the first sub-pulse after the generation of the drive signal.
So that the drive signal can be updated fastest while ensuring the periodicity of the drive signal.
In fig. 6 and 7, the example is illustrated in which the time t '1 at which the current frame luminance data is updated and the driving signal is generated is not equal to the first sub-pulse start time t '2, and the time t '2 in fig. 6 and 7 is the start time of the first sub-pulse after the driving signal is generated. If the time t '1 of updating the current frame brightness data and generating the driving signal is equal to the first sub-pulse start time t '2, the time t '1 is the start time of the first sub-pulse after generating the driving signal.
In some embodiments, as shown in fig. 1, the light emitting substrate further includes a second control module TCON for providing a first control signal to the first control module DCON, where the first control module DCON determines a communication signal of each light emitting area of the current frame according to the first control signal.
In some embodiments, as shown in fig. 1, the driving chips DIMMER are electrically connected to the first control module DCON through the first signal line 5, and in the extending direction of the first signal line 5, the driving chips DIMMER of a column of light emitting regions are electrically connected to the same first signal line 5.
In some embodiments, as shown in fig. 8, the logic control module 02 includes:
a data processing control unit 021 electrically connected to the brightness data determining module (not shown) for generating a pulse width control signal according to the brightness data;
a clock signal receiving unit 022 for receiving a clock signal;
the pulse width modulation unit 023 is electrically connected with the data processing control unit 021 and is used for generating a pulse width modulation signal according to a pulse control signal;
a driving signal generating unit 024 electrically connected to the pulse width modulation unit 023 and a brightness data determining module (not shown) for generating a driving signal according to the brightness data and according to the pulse width modulation signal;
the driving signal updating unit 025 is electrically connected to the clock signal receiving unit 022 and the driving signal generating unit 024, and is used for outputting a driving signal at a preset time in response to the clock signal.
In implementations, the clock signal matches the pulse width modulated signal. It is thereby achieved that the drive signal is updated at the start of the first sub-pulse under control of the clock signal.
In some embodiments, as shown in fig. 9, the luminance data determination module 01 includes: a reference voltage/reference current generation unit BGR, and a constant voltage unit LDO. The reference voltage/reference current generation unit BGR generates luminance data and transmits the luminance data to the logic control module through the constant voltage unit LDO.
In some embodiments, as shown in fig. 9, the driver chip dim further includes: the power supply PORT VDD, the ground PORT GND, the output PORTs OUT0, OUT1, OUT2 and OUT3, the address PORTs DI and DO, the clock generator FOSC, the input/output module IO PORT, the low-voltage locking module UVLO, the constant-current output module CR and the high-temperature/energy-saving module TSD/OPF. The brightness data determining module 01 is electrically connected with the power supply PORT VDD, the constant voltage unit LDO is also electrically connected with the low voltage locking module UVLO and the constant current output module CR, the clock generator FOSC is electrically connected with the logic control module 02, the input output module IO PORT is electrically connected with the logic control module 02, the address PORTs DI and DO, the high temperature/energy saving preventing module TSD/OPF is electrically connected with the logic control module 02 and the constant current output module CR, the low voltage locking module UVLO is also electrically connected with the constant current output module CR, and the constant current output module CR is also electrically connected with the output PORTs OUT0, OUT1, OUT2 and OUT 3.
It should be noted that, in fig. 9, the driving chip DIMMER includes 4 output ports OUT0, OUT1, OUT2, OUT3, and the output ports OUT0, OUT1, OUT2, OUT3 are electrically connected to the 4 light emitting units, respectively.
In particular implementations, the communication signal is transmitted to the luminance data determination module through the power supply port VDD. The output ports OUT0, OUT1, OUT2, OUT3 are electrically connected to the light emitting unit. The driving signals updated by the logic control module are transmitted to the light emitting units through the constant current output module CR and the output ports OUT0, OUT1, OUT2 and OUT 3. The address port DI is used for receiving address signals, the address signals are used for gating the driving chip DIMMER of the corresponding address, the address port DO outputs relay signals, when the address signal is implemented, a row of driving chips DIMMER are cascaded, the address port DO is electrically connected with the address port DI of the next driving chip DIMMER, and the address signals are provided for the next address port DI. The input-output module IO PORT transmits the address signal input from the address PORT DI to the logic control module 02, or transmits the relay signal output from the logic control module 02 to the address PORT DO. In practical implementation, the address signal input by the address port DI needs to be encoded by the logic control module 02 by using a pulse width modulation signal to generate a corresponding relay signal. The ground port GND is for receiving a common voltage signal, i.e., a ground level signal. The clock signal receiving unit is electrically connected with the clock generator to receive the clock signal.
In some embodiments, as shown in fig. 10, the driving signal generating unit 024 specifically includes: a first operational amplifier 0241, and a first switching transistor 0242;
the first input terminal of the first operational amplifier 0241 is used for inputting brightness data, the second input terminal of the first operational amplifier 0241 is electrically connected with the source electrode of the first switching transistor 0242, the output terminal of the first operational amplifier 0241 is electrically connected with the grid electrode of the first switching transistor 0242, the first power terminal of the first operational amplifier 0241 is electrically connected with the pulse width modulation unit, and the second power terminal of the first operational amplifier 0241 is electrically connected with the first constant voltage power terminal V1;
the source of the first switching transistor 0242 is grounded, and the drain of the first switching transistor 0242 is electrically connected to the driving signal updating unit 025.
In some embodiments, the first constant voltage power supply terminal is a constant voltage unit.
In some embodiments, as shown in fig. 10, the first input terminal of the first operational amplifier 0241 is electrically connected to the constant voltage unit LDO through the constant voltage source 0243; the first input end of the first operational amplifier 0241 is also electrically connected with one end of a first resistor R1, and the other end of the first resistor R1 is grounded; the source of the first switching transistor 0242 is also electrically connected to one end of the second resistor R2, and the other end of the second resistor R2 is grounded.
In some embodiments, as shown in fig. 10, the pulse width control signal update module 025 includes: an inverter 0251 and an N-type transistor 0252;
an input terminal of the inverter 0251 is electrically connected to the clock signal receiving unit, a first power terminal of the inverter 0251 is electrically connected to the low-level signal terminal Vss, a second power terminal of the inverter 0251 is electrically connected to the high-level signal terminal Vdd, and an output terminal of the inverter 0251 is electrically connected to a gate of the N-type transistor 0252;
the source of the N-type transistor 0252 is electrically connected to the drain of the first transistor 0242, and the drain of the N-type transistor 0252 is used for outputting a driving signal.
It should be noted that, since the inverter can invert the phase of the input signal by 180 degrees, that is, the inverter outputs a low level when inputting a high level, and the inverter outputs a low level when inputting a high level; the N-type transistor is turned on under the control of low level, namely, the N-type transistor is turned on when the inverter inputs high level, and the N-type transistor is turned off when the inverter inputs low level. Because the pulse width modulation signal is matched with the clock signal, the moment when the inverter inputs the high level is the starting moment of the first level signal in the first sub-pulse of the pulse width modulation signal, namely the starting moment of the first level signal in the first sub-pulse, the N-type transistor is started, and therefore the driving signal can be updated at the starting moment of the first sub-pulse under the control of the clock signal.
In specific implementation, the drain of the N-type transistor is electrically connected to the constant current output module CR.
In an implementation, the first switching transistor and the N-type transistor are thin film transistors or metal-oxide semiconductor field effect transistors.
In the embodiment, one light emitting region may include one light emitting unit, or may include a plurality of light emitting units 4 as shown in fig. 1. When one light emitting region includes a plurality of light emitting units, the driving chip DIMMER outputs a driving signal to each light emitting unit 4.
In some embodiments, the light emitting unit includes at least one light emitting device. I.e. the light emitting unit may comprise only one light emitting device or may comprise a plurality of light emitting devices. When the light emitting unit includes a plurality of light emitting devices, the plurality of light emitting devices may be connected in series or in parallel.
In some embodiments, the light emitting device is a micro-sized inorganic light emitting diode device.
In particular embodiments, the Micro-sized inorganic light emitting diode is, for example, a Mini light emitting diode (Mini Light Emitting Diode, mini-LED) or a Micro light emitting diode (Micro Light Emitting Diode, micro-LED). Mini-LEDs and Micro-LEDs are small in size and high in brightness, and can be widely applied to display devices or backlight modules thereof. For example, typical dimensions (e.g., length) of Micro-LEDs are less than 100 microns, such as 10 microns to 80 microns; typical dimensions (e.g., length) of Mini-LEDs are 80 microns to 350 microns, such as 80 microns to 120 microns. The electronic component may be at least one of a Micro-LED or a Mini-LED.
Based on the same inventive concept, the embodiment of the present application further provides a driving method of a light emitting substrate, as shown in fig. 1, where the light emitting substrate includes a plurality of light emitting areas 1 arranged in an array; the light emitting area 1 comprises at least one light emitting unit 4; as shown in fig. 11, the driving method includes:
s101, determining brightness data of a light-emitting area of a current frame;
s102, generating a pulse width modulation signal and a driving signal of a light emitting unit corresponding to the pulse width modulation signal according to brightness data of a current frame; the pulse width modulation signal comprises a plurality of first sub-pulses, the driving signal comprises a plurality of second sub-pulses, and the second sub-pulses correspond to the first sub-pulses;
s103, updating the driving signal at a preset time; the preset time is the starting time of the first sub-pulse.
According to the driving method of the light-emitting substrate, the pulse width modulation signal comprises a plurality of first sub-pulses, the driving signal of the light-emitting unit corresponds to the pulse width modulation signal, and the driving signal corresponding to one frame of brightness data consists of a plurality of second sub-pulses. The refresh frequency of the first sub-pulse is greater than that of one pulse of the driving signal in the related art, and correspondingly, the driving signal comprises a plurality of second sub-pulses, so that the effect of improving the refresh frequency can be achieved, and further, the visible Flicker can be avoided. In addition, as the brightness data is not refreshed in a subframe mode, the design difficulty and cost of the control module of the light-emitting substrate can be prevented from being increased. In addition, according to the driving method of the light-emitting substrate, the driving signal is updated at the starting time of the first sub-pulse, so that the periodicity of the driving signal can be guaranteed, invisible Flicker caused by the fact that the periodicity of the driving signal is damaged is avoided, and the influence on eyesight and nerve health of a user is avoided.
In some embodiments, the first sub-pulse includes a first level signal and a second level signal applied sequentially;
the driving signal comprises a plurality of second sub-pulses, the second sub-pulses correspond to the first sub-pulses, and the second sub-pulses comprise a third level signal and a fourth level signal which are sequentially applied;
the first level signal and the third level signal are high level signals, and the second level signal and the fourth level signal are low level signals.
In some embodiments, the pulse width modulated signal includes each first sub-pulse having an equal duration and the drive signal includes each second sub-pulse having an equal duration.
In some embodiments, the pulse width modulated signal includes a plurality of first sub-pulses, each of the first level signals having an equal duration, and each of the second level signals having an equal duration. And in a plurality of second sub-pulses included in the driving signal, the duration of the third level signal is equal, and the duration of the fourth level signal is equal.
In some embodiments, generating a pulse width modulation signal and a driving signal of a light emitting unit corresponding to the pulse width modulation signal according to luminance data of a current frame specifically includes:
generating a pulse width control signal according to the brightness data of the current frame;
generating a pulse width modulation signal according to the pulse control signal;
generating a driving signal according to the brightness data and according to the pulse width modulation signal;
updating the driving signal at a preset time, specifically including:
the driving signal is output at a preset time in response to the clock signal.
The display device provided in the embodiment of the application includes: the embodiment of the application provides a light-emitting substrate and a display panel positioned on the light-emitting side of the light-emitting substrate.
I.e. the light emitting substrate serves as a backlight for the display device.
In some embodiments, the display panel is a liquid crystal display panel, comprising: an array substrate and an opposite substrate disposed opposite to each other, and a liquid crystal layer disposed between the array substrate and the opposite substrate. For example, the array substrate includes a plurality of sub-pixel units, each of which includes a thin film transistor and a pixel electrode; the opposite substrate comprises color resistors which are in one-to-one correspondence with the sub-pixel units; the array substrate or the opposite substrate further includes a common electrode.
In a specific implementation, the display panel and the light-emitting substrate may share a second driving module, i.e. the second driving module is further configured to provide a display control signal to the display panel.
The display device provided by the embodiment of the application is as follows: any product or component with display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are those of ordinary skill in the art, and will not be described in detail herein, nor should they be considered as limiting the application. The implementation of the display device can be referred to the embodiment of the light-emitting substrate, and the repetition is not repeated.
In summary, according to the light emitting substrate, the driving method of the light emitting substrate and the display device provided in the embodiments of the present application, the pulse width modulation signal determined by the driving chip includes a plurality of first sub-pulses, the driving signal of the light emitting unit corresponds to the pulse width modulation signal, and the driving signal corresponding to one frame of luminance data is composed of a plurality of second sub-pulses. Under the condition that the total duration of a frame of pulse width modulation signal and a driving signal is not changed, the refreshing frequency of the first sub-pulse is larger than the refreshing frequency of one pulse of the pulse width modulation signal in the related art, and correspondingly, the refreshing frequency of the driving signal can be provided, so that a visible Flicker can be avoided. In addition, as the brightness data is not refreshed in a subframe mode, the design difficulty and cost of the control module of the light-emitting substrate can be prevented from being increased. In addition, after the logic control module included in the driving chip obtains the current frame brightness data to generate the driving signal, the driving signal is updated at the starting time of the first sub-pulse, so that the periodicity of the driving signal output by the driving chip DIMMER can be ensured, invisible Flicker caused by the periodicity of the driving signal being damaged is avoided, and the influence on the eyesight and nerve health of a user is avoided.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (10)
1. A light-emitting substrate, characterized in that the light-emitting substrate comprises: a plurality of light emitting areas arranged in an array; each light-emitting area comprises a driving chip and at least one light-emitting unit electrically connected with the driving chip; the driving chip includes:
the brightness data determining module is used for determining brightness data of the light-emitting area of the current frame;
the logic control module is electrically connected with the brightness data determining module and is used for: generating a pulse width modulation signal and a driving signal of the light emitting unit corresponding to the pulse width modulation signal according to the brightness data of the current frame, and outputting the driving signal at a preset time; wherein the pulse width modulated signal comprises a plurality of first sub-pulses and the drive signal comprises a plurality of second sub-pulses, the second sub-pulses corresponding to the first sub-pulses; the preset time is the starting time of the first sub-pulse.
2. The light-emitting substrate of claim 1, wherein the logic control module comprises:
the data processing control unit is electrically connected with the brightness data determining module and is used for generating a pulse width control signal according to the brightness data;
a clock signal receiving unit for receiving a clock signal;
the pulse width modulation unit is electrically connected with the data processing control unit and is used for generating a pulse width modulation signal according to the pulse control signal;
a driving signal generating unit electrically connected with the pulse width modulation unit and the brightness data determining module and used for generating the driving signal according to the brightness data and the pulse width modulation signal;
and the driving signal updating unit is electrically connected with the clock signal receiving unit and the driving signal generating unit and is used for responding to the clock signal and outputting the driving signal at a preset moment.
3. The light-emitting substrate according to claim 2, wherein the driving signal generation unit specifically includes: a first operational amplifier, and a first switching transistor;
the first input end of the first operational amplifier is used for inputting the brightness data, the second input end of the first operational amplifier is electrically connected with the source electrode of the first switching transistor, the output end of the first operational amplifier is electrically connected with the grid electrode of the first switching transistor, the first power end of the first operational amplifier is electrically connected with the pulse width modulation unit, and the second power end of the first operational amplifier is electrically connected with the first constant voltage power end;
the source electrode of the first switching transistor is grounded, and the drain electrode of the first switching transistor is electrically connected with the driving signal updating unit.
4. A light-emitting substrate according to claim 3, wherein the pulse width control signal update module comprises: an inverter and an N-type transistor;
the input end of the inverter is electrically connected with the clock signal generation unit, the first power end of the inverter is electrically connected with the low-level signal end, the second power end of the inverter is electrically connected with the high-level signal end, and the output end of the inverter is electrically connected with the grid electrode of the N-type transistor;
the source electrode of the N-type transistor is electrically connected with the drain electrode of the first transistor, and the drain electrode of the N-type transistor is used for outputting the driving signal.
5. The method of any of claims 1-4, wherein the pulse width modulated signal comprises each of the first sub-pulses having an equal duration and the drive signal comprises each of the second sub-pulses having an equal duration.
6. The method of claim 5, wherein the preset time is a start time of a first one of the first sub-pulses after the driving signal is generated.
7. The method of any one of claims 1-4, wherein the first sub-pulse comprises a first level signal and a second level signal applied sequentially;
the driving signal comprises a plurality of second sub-pulses, the second sub-pulses correspond to the first sub-pulses, and the second sub-pulses comprise a third level signal and a fourth level signal which are applied in sequence;
the first level signal and the third level signal are high level signals, and the second level signal and the fourth level signal are low level signals.
8. The light-emitting substrate according to any one of claims 1 to 4, wherein the light-emitting unit comprises at least one micro-sized inorganic light-emitting diode device.
9. A driving method of a light-emitting substrate comprises a plurality of light-emitting areas arranged in an array; the light emitting region comprises at least one light emitting unit, characterized in that the method comprises:
determining brightness data of the light-emitting area of the current frame;
generating a pulse width modulation signal and a driving signal of the light emitting unit corresponding to the pulse width modulation signal according to the brightness data of the current frame; wherein the pulse width modulated signal comprises a plurality of first sub-pulses and the drive signal comprises a plurality of second sub-pulses, the second sub-pulses corresponding to the first sub-pulses;
updating the driving signal at a preset time; the preset time is the starting time of the first sub-pulse.
10. A display device, comprising: the light-emitting substrate according to any one of claims 1 to 8, and a display panel on a light-emitting side of the light-emitting substrate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116743705A (en) * | 2023-06-15 | 2023-09-12 | 北京显芯科技有限公司 | Address configuration method, backlight control device and display device |
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| CN113873719A (en) * | 2021-11-30 | 2021-12-31 | 深圳赫飞物联科技有限公司 | Dimming control circuit |
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| CN102105005A (en) * | 2009-12-16 | 2011-06-22 | 三星电机株式会社 | Apparatus for driving light emitting divice using pulse-width modulatoin |
| CN113873719A (en) * | 2021-11-30 | 2021-12-31 | 深圳赫飞物联科技有限公司 | Dimming control circuit |
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| CN116743705A (en) * | 2023-06-15 | 2023-09-12 | 北京显芯科技有限公司 | Address configuration method, backlight control device and display device |
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