CN111508430A - Frequency conversion refreshing method, pixel driving method, device and electronic equipment - Google Patents
Frequency conversion refreshing method, pixel driving method, device and electronic equipment Download PDFInfo
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- CN111508430A CN111508430A CN202010350766.8A CN202010350766A CN111508430A CN 111508430 A CN111508430 A CN 111508430A CN 202010350766 A CN202010350766 A CN 202010350766A CN 111508430 A CN111508430 A CN 111508430A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
Abstract
The invention provides a variable frequency refreshing method, a pixel driving device and electronic equipment. The method comprises the following steps: when the picture refreshing frequency is changed from a first frequency to a second frequency, switching a control signal input into a pixel driving circuit from a first control signal corresponding to the first frequency to a second control signal corresponding to the second frequency so that the pixel driving circuit controls a light-emitting element to emit light according to the second control signal; the first frequency is greater than the second frequency, the cut-off time of the light-emitting signal in the second control signal is greater than the cut-off time of the light-emitting signal in the first control signal, and the storage capacitor in the input pixel driving circuit is matched with the first frequency. Because the cut-off time of the light-emitting signal in the second control signal is longer than that of the light-emitting signal in the first control signal, the light-emitting time of the pixel driving circuit at low frequency is shortened, and the problem of screen flashing during frequency switching in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of O L ED display, in particular to a frequency conversion refreshing method, a pixel driving device and electronic equipment.
Background
The organic light Emitting Diode (O L ED L lighting Emitting Diode, O L ED) display device has many advantages of self-luminescence, low driving voltage, high luminous efficiency, short response time, and wide temperature range, etc. O L ED is widely recognized as a display device having a development potential, and is classified into a Passive organic electroluminescent Diode (PMO L ED, abbreviated as AMO L ED) and an Active Matrix organic light Emitting Diode (AMO L ED, abbreviated as AMO L ED) according to a driving method, a plurality of pixels arranged in an array are provided in the AMO L ED display device, each pixel drives light emission through a pixel driving circuit, for a dynamic picture, the display power consumption of the display device can be improved by improving the refresh frequency of the picture, for some relatively static pictures, the display power consumption of the display device can be saved by reducing the refresh frequency of the picture, and for enabling the display device to be compatible with the high frequency and the low power consumption characteristic, the display device 829 4 needs to support the dynamic display frequency.
In the prior art, when a picture needs to be refreshed at a high frequency, a high-frequency control signal is input into a pixel driving circuit, so that the pixel driving circuit works at the high frequency; when a picture needs to be refreshed at a low frequency, a low-frequency control signal is input into the pixel driving circuit, so that the pixel driving circuit prolongs the light-emitting time according to the low-frequency control signal, and further the low-frequency refreshing is realized.
However, the low frequency light emission time is long, and the charge retention rate of the storage capacitor in the driving circuit is insufficient, so that the display brightness at the low frequency is different from that at the high frequency, and the problem of screen flashing is easily caused.
Disclosure of Invention
The invention provides a frequency conversion refreshing method and a frequency conversion refreshing device, which are used for solving the screen flashing phenomenon in the prior art when the refreshing frequency is switched.
In a first aspect, the present invention provides a frequency conversion refreshing method, including: when the picture refreshing frequency is changed from a first frequency to a second frequency, switching a control signal input into a pixel driving circuit from a first control signal corresponding to the first frequency to a second control signal corresponding to the second frequency so that the pixel driving circuit controls a light-emitting element to emit light according to the second control signal; the first frequency is greater than the second frequency, the cut-off time of the light-emitting signal in the second control signal is greater than the cut-off time of the light-emitting signal in the first control signal, and the storage capacitor in the input pixel driving circuit is matched with the first frequency.
Because the cut-off time of the light-emitting signal in the second control signal is longer than that of the light-emitting signal in the first control signal, the light-emitting time of the pixel driving circuit at low frequency is shortened, and the problem of screen flashing during frequency switching in the prior art is solved.
Optionally, before switching the control signal input to the pixel driving circuit from the first control signal corresponding to the first frequency to the second control signal corresponding to the second frequency, the method further includes: and generating the second control signal according to the proportional relation between the first frequency and the second frequency and the first control signal.
Optionally, the first control signal includes a first scanning signal and a first light emitting signal; the generating the second control signal according to the proportional relationship between the first frequency and the second frequency and the first control signal includes: according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first scanning signal to obtain a second scanning signal, wherein the conduction time of the second scanning signal is the same as the conduction time of the first scanning signal; and determining the second control signal according to the first light-emitting signal and the second scanning signal.
By the control signal generated by the method, when the refreshing frequency is switched from high frequency to low frequency, the light emitting time of the pixel driving circuit in one light emitting period is shortened, the brightness at the low frequency is adjusted, and the problem of screen flashing during frequency switching in the prior art is solved.
Optionally, the first control signal includes a first scanning signal and a first light emitting signal; the generating the second control signal according to the proportional relationship between the first frequency and the second frequency and the first control signal includes: according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first scanning signal to obtain a second scanning signal, wherein the conduction time of the second scanning signal is the same as the conduction time of the first scanning signal; according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first light-emitting signal to obtain a second light-emitting signal, wherein the cut-off time of the second light-emitting signal is longer than that of the first light-emitting signal; and determining the second control signal according to the second scanning signal and the second light-emitting signal.
By the control signal generated by the method, when the refreshing frequency is switched from high frequency to low frequency, the light emitting time of the pixel driving circuit in one light emitting period is shortened, the brightness at the low frequency is adjusted, and the problem of screen flashing during frequency switching in the prior art is solved.
Optionally, the first scanning signal includes: a first reset signal and a first compensation signal; the extending the period of the first scanning signal according to the proportional relationship between the first frequency and the second frequency to obtain a second scanning signal includes: according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first reset signal to obtain a second reset signal, wherein the conduction time of the second reset signal is the same as the conduction time of the first reset signal; according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first compensation signal to obtain a second compensation signal, wherein the conduction time of the second compensation signal is the same as that of the first compensation signal; and determining the second scanning signal according to the second reset signal and the second compensation signal.
Optionally, the second reset signal corresponds to an on state of the second reset signal when the second reset signal is at a low level, and corresponds to an off state of the second reset signal when the second reset signal is at a high level; the second compensation signal corresponds to an on state of the second compensation signal when the second compensation signal is at a low level, and corresponds to an off state of the second compensation signal when the second compensation signal is at a high level.
In a second aspect, the present invention provides a pixel driving method applied to a pixel driving circuit including a storage capacitor and a light emitting element, the storage capacitor being matched to a first frequency, the method comprising: when the control signal received by the pixel driving circuit is switched from a first control signal corresponding to the first frequency to a second control signal corresponding to a second frequency, the pixel driving circuit controls the light-emitting element to emit light according to the second control signal, wherein the first frequency is greater than the second frequency, and the cut-off time of the light-emitting signal in the second control signal is greater than the cut-off time of the light-emitting signal in the first control signal.
Optionally, the pixel driving circuit further includes a reset module, a compensation module, a light-emitting control module, and a driving transistor, and the second control signal includes: a second scan signal and a second light emission signal; the pixel driving circuit controls the light emitting element to emit light according to the second control signal, and comprises: in a reset stage, the reset module resets the grid voltage of the driving transistor according to the second scanning signal; in the compensation stage, the compensation module rewrites the grid voltage of the driving transistor according to the second scanning signal; in the light-emitting stage, the light-emitting control module controls the light-emitting element to emit light according to the second light-emitting signal, and the cut-off time of the second light-emitting signal is longer than the cut-off time of the light-emitting signal in the first control signal.
In a third aspect, the present invention provides a variable frequency refresh apparatus, including: the acquisition module is used for acquiring the refreshing frequency; and the input module is used for switching the control signal input into the pixel driving circuit from a first control signal corresponding to the first frequency to a second control signal corresponding to the second frequency when the picture refreshing frequency is changed from the first frequency to the second frequency, so that the pixel driving circuit controls the light-emitting element to emit light according to the second control signal.
Optionally, the variable frequency refresh apparatus further includes: and the generating module is used for generating the second control signal according to the proportional relation between the first frequency and the second frequency and the first control signal.
Optionally, the first control signal includes a first scanning signal and a first light emitting signal; the generation module is specifically configured to: according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first scanning signal to obtain a second scanning signal, wherein the conduction time of the second scanning signal is the same as the conduction time of the first scanning signal; and determining the second control signal according to the first light-emitting signal and the second scanning signal.
Optionally, the first control signal includes a first scanning signal and a first light emitting signal; the generation module is specifically configured to: according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first scanning signal to obtain a second scanning signal, wherein the conduction time of the second scanning signal is the same as the conduction time of the first scanning signal; according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first light-emitting signal to obtain a second light-emitting signal, wherein the cut-off time of the second light-emitting signal is longer than that of the first light-emitting signal; and determining the second control signal according to the second scanning signal and the second light-emitting signal.
Optionally, the generating module is specifically configured to: according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first reset signal to obtain a second reset signal, wherein the conduction time of the second reset signal is the same as the conduction time of the first reset signal; according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first compensation signal to obtain a second compensation signal, wherein the conduction time of the second compensation signal is the same as that of the first compensation signal; and determining the second scanning signal according to the second reset signal and the second compensation signal.
Optionally, the second reset signal corresponds to an on state of the second reset signal when the second reset signal is at a low level, and corresponds to an off state of the second reset signal when the second reset signal is at a high level; the second compensation signal corresponds to an on state of the second compensation signal when the second compensation signal is at a low level, and corresponds to an off state of the second compensation signal when the second compensation signal is at a high level.
In a fourth aspect, the present invention provides an electronic device comprising: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to implement the variable frequency refresh method described in the above first aspect via execution of the executable instructions.
According to the variable-frequency refreshing method and device, when the picture refreshing frequency is changed from the first frequency to the second frequency, the control signal input to the pixel driving circuit is switched from the first control signal corresponding to the first frequency to the second control signal corresponding to the second frequency, and as the cut-off time of the light-emitting signal in the second control signal is longer than the cut-off time of the light-emitting signal in the first control signal, the light-emitting time of the pixel driving circuit at low frequency is shortened, and the problem of screen flashing during frequency switching in the prior art is solved.
Drawings
Fig. 1 is a schematic structural diagram of a pixel driving circuit provided in the prior art;
FIG. 2 is a diagram illustrating waveforms of signals S1, S2, S3 and EM in FIG. 1 according to the prior art;
FIG. 3 is a system framework provided by the present invention;
fig. 4 is a schematic flowchart of a frequency conversion refresh method according to a first embodiment of the present invention;
fig. 5 is a schematic flowchart of a second embodiment of the variable frequency refresh method according to the present invention;
FIG. 6 is a first schematic diagram illustrating a waveform of a control signal according to the present invention;
fig. 7 is a schematic flowchart of a third embodiment of a variable frequency refresh method according to the present invention;
FIG. 8 is a second schematic diagram of a waveform of a control signal provided by the present invention;
FIG. 9 is a schematic structural diagram of a frequency conversion refresh apparatus according to the present invention;
fig. 10 is a schematic diagram of a hardware structure of the electronic device provided in the present invention.
Detailed Description
To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a alone, b alone, c alone, a and b combination, a and c combination, b and c combination, or a, b and c combination, wherein a, b and c can be single or multiple.
In order to enable the AMO L ED display device to be compatible with high-frequency refresh and low-power consumption characteristics, the AMO L ED display device needs to support dynamic frequency refresh, and the frame refresh of the AMO L ED display device is realized by a pixel driving circuit, fig. 1 is a structural schematic diagram of a pixel driving circuit provided in the prior art, and transistors in fig. 1 are all P-type transistors.
Referring to fig. 2, taking the frequency of the variable frequency refresh including 120Hz and 60Hz as an example, assuming that the storage capacitors in the pixel driving circuit shown in fig. 1 and 120Hz are matched, when the picture refresh frequency is changed from 120Hz to 60Hz, in the prior art, the control signal input to the pixel driving circuit is switched from the signal corresponding to 120Hz in fig. 2 to the signal corresponding to 60Hz in fig. 2. However, in fig. 2, the time during which EM is at a low level is significantly prolonged in one lighting period in comparison with the signal corresponding to 60Hz and 120 Hz. When the EM is at a low level, M5 and M6 are turned on, and the light-emitting element emits light. It can be seen that when the control signal input to the pixel driving circuit is changed to a signal corresponding to 60Hz, the light emitting time in one light emitting period is obviously prolonged, and the storage capacitor in fig. 1 is matched with 120Hz, for 60Hz, the charge retention rate of the storage capacitor is low, and if the leakage currents of M4-1 and M4-2 are large, the G-point potential will leak through M4-1 and M4-2, which further causes low gray level lighting, and causes the luminance of 60Hz to be higher than the luminance of 120Hz, resulting in the occurrence of the phenomenon of screen flashing during frequency switching.
Fig. 3 is a system framework diagram provided by the present invention, and the system framework shown in fig. 3 includes a signal input device and a pixel driving circuit, wherein the pixel driving circuit may be the pixel driving circuit shown in fig. 1, the signal input device may generate a corresponding control signal according to a refresh frequency, the control signal may include S1, S2, S3 and EM shown in fig. 2, and the signal input device may input the generated control signal into the pixel driving circuit to make the pixel driving circuit emit light according to the corresponding refresh frequency.
In view of the above technical problems in the prior art, the present invention provides a variable frequency refresh method, in which when the refresh frequency is decreased from 120Hz to 60Hz, the extension of the light emitting time of the pixel driving circuit shown in fig. 1 causes G-point leakage, which further increases the brightness to an entry point, and the waveform of the control signal is adjusted to shorten the light emitting time of the pixel driving circuit in the light emitting stage, thereby reducing the display brightness when the refresh frequency is 60Hz, so as to solve the problem of screen flicker during frequency switching in the prior art.
The following describes the frequency conversion refresh method provided by the present invention in detail through specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 4 is a schematic flowchart of a frequency conversion refresh method according to a first embodiment of the present invention. The frequency conversion refresh method provided by this embodiment can be applied to the signal input device shown in fig. 3, and as shown in fig. 4, the frequency conversion refresh method provided by this embodiment includes:
s401, acquiring the picture refreshing frequency.
Specifically, the signal input device may obtain a picture refresh frequency from the identification unit, where the identification unit is configured to identify a state of the picture, send a higher refresh frequency to the signal input device when the picture is identified as a dynamic picture, and send a lower refresh frequency to the signal input device when the identified picture is a relatively static picture.
Such as: the picture refresh frequency transmitted to the signal input device when the recognition unit recognizes that the picture is a dynamic picture may be 120Hz, and the picture refresh frequency transmitted to the signal input device when the recognition unit recognizes that the picture is a relatively static picture may be 60 Hz.
And S402, when the picture refreshing frequency is changed from the first frequency to the second frequency, switching the control signal input into the pixel driving circuit from the first control signal corresponding to the first frequency to the second control signal corresponding to the second frequency so as to enable the pixel driving circuit to control the light-emitting element to emit light according to the second control signal.
The first frequency is larger than the second frequency, the cut-off time of the light-emitting signal in the second control signal is larger than the cut-off time of the light-emitting signal in the first control signal, and the light-emitting signal is input into a storage capacitor in the pixel driving circuit and is matched with the first frequency.
In one possible implementation, before switching the control signal input to the pixel driving circuit from the first control signal corresponding to the first frequency to the second control signal corresponding to the second frequency, the method of the embodiment may further include: and generating the second control signal according to the proportional relation between the first frequency and the second frequency and the first control signal.
Take the first frequency as 120Hz and the second frequency as 60Hz for example:
when the refresh frequency sent to the signal input device by the identification unit is changed from 120Hz to 60Hz, the signal input device firstly generates a second control signal corresponding to 60Hz according to the proportional relation between 120Hz and 60Hz, and then inputs the second control signal to the pixel driving circuit, so that the pixel driving circuit controls the light-emitting element to emit light according to the second control signal. It should be noted that: when the corresponding second control signal is generated according to the proportional relation between 120Hz and 60Hz, the cut-off time of the light-emitting signal in the second control signal is ensured to be larger than the cut-off time of the light-emitting signal in the first control signal corresponding to 120 Hz.
It should be noted that: the difference between the off-time of the light-emitting signal in the second control signal and the off-time of the light-emitting signal in the first control signal may be designed in combination with the leakage current.
In the variable frequency refresh method provided by this embodiment, when the frame refresh frequency is changed from the first frequency to the second frequency, the control signal input to the pixel driving circuit is switched from the first control signal corresponding to the first frequency to the second control signal corresponding to the second frequency, and since the cut-off time of the light-emitting signal in the second control signal is longer than the cut-off time of the light-emitting signal in the first control signal, the light-emitting time of the pixel driving circuit at the low frequency is shortened, and the problem of screen flashing during frequency switching in the prior art is solved.
Fig. 5 is a schematic flow chart of a second embodiment of the variable frequency refresh method provided in the present invention. The frequency conversion refresh method provided in this embodiment may still be applied to the signal input device shown in fig. 3, and this embodiment describes in detail a possible implementation manner of generating the second control signal in the foregoing embodiment, as shown in fig. 5, the frequency conversion refresh method provided in this embodiment includes:
s501, acquiring the picture refreshing frequency.
The implementation manner of S501 may refer to S401 in the above embodiment, which is not described again in the present invention. The process of generating the second control signal from the first control signal in the present embodiment is described below by S502 to S503.
Referring to fig. 6, taking the first frequency as 120Hz and the second frequency as 60Hz as an example, the first control signal corresponding to 120Hz may include a scan signal and a light emitting signal, and to distinguish from the second control signal, the scan signal included in the first control signal is referred to as a first scan signal, and the light emitting signal included in the first control signal is referred to as a first light emitting signal. In fig. 6, S1, S2, and S3 for 120Hz are first scan signals, and EM for 120Hz is a first light emitting signal. S502-S503 may specifically be:
s502, when the picture refreshing frequency is changed from the first frequency to the second frequency, the period of the first scanning signal is prolonged according to the proportional relation between the first frequency and the second frequency, and a second scanning signal is obtained.
Referring to fig. 6, taking the first frequency as 120Hz and the second frequency as 60Hz as an example, since the first frequency is 2 times of the second frequency, the period of the first scanning signal can be extended to 2 times of the original period. The extended scan signal may be referred to as a second scan signal, but it should be noted that: in one scanning period, the extension processing only extends the off time of the first scanning signal, and the on time is kept unchanged.
Specifically, according to the difference of the phases corresponding to the signals included in the scan signals, the signals included in the scan signals can be divided into the reset signal and the compensation signal, and the reset signal included in the first scan signal is referred to as the first reset signal, and the compensation signal included in the first scan signal is referred to as the first compensation signal. The S1 signal corresponding to 120Hz in fig. 6 may be the first reset signal, and both the S2 signal and the S3 signal may be the first compensation signal. The step S502 of performing the extension process on the period of the first scanning signal may specifically include:
on one hand, according to the proportional relation between the first frequency and the second frequency, the period of the first reset signal is prolonged to obtain a second reset signal, and the conducting time of the second reset signal is the same as the conducting time of the first reset signal. On the other hand, the period of the first compensation signal is extended according to the proportional relation between the first frequency and the second frequency to obtain a second compensation signal, and the conduction time of the second compensation signal is the same as the conduction time of the first compensation signal. The second reset signal and the second compensation signal can form a second scanning signal corresponding to a second frequency.
The second reset signal corresponds to the on state of the second reset signal when being at a low level, and corresponds to the off state of the second reset signal when being at a high level; the second compensation signal corresponds to an on state of the second compensation signal when the second compensation signal is at a low level, and corresponds to an off state of the second compensation signal when the second compensation signal is at a high level.
Continuing with the example of FIG. 6, the cycle of S1 for 120Hz was extended by 2 times to obtain S1 for 60Hz, and the cycles of S2 and S3 for 120Hz were extended by 2 times to obtain S2 and S3 for 60 Hz. It should be noted that the extension processing of the scan signal merely extends the off time of the scan signal, and does not extend the on time of the scan signal, as shown in fig. 6, the low level time of S1, S2 and S3 is the same compared with 120Hz and 60Hz, and since the applied transistors in the waveform diagram shown in fig. 6 are P-type transistors, the low level corresponds to the on of the signal, and the high level corresponds to the off of the signal.
S503, determining a second control signal according to the first light-emitting signal and the second scanning signal.
Specifically, the first light-emitting signal corresponding to the first frequency may be directly used as the second light-emitting signal corresponding to the second frequency, and then after the second scan signal is obtained in S502, the second scan signal and the first light-emitting signal may be directly determined as the control signal corresponding to the second frequency. Referring to fig. 6, after S1, S2 and S3 corresponding to 120Hz is subjected to elongation processing through S502, S1, S2 and S3 after elongation processing and EM without elongation processing are directly used as control signals corresponding to 60 Hz. Because when the picture refreshing frequency is reduced from 120Hz to 60Hz, although the storage capacitor in the pixel driving circuit is not matched with 60Hz, the luminous signal corresponding to 60Hz is not changed compared with the luminous signal corresponding to 120Hz, so that the luminous time of the pixel driving circuit is shortened when the refreshing frequency is 60Hz, the brightness at low frequency is adjusted, and the problem of screen flicker during frequency switching in the prior art is solved.
S504, the control signal input to the pixel driving circuit is switched from a first control signal corresponding to the first frequency to a second control signal corresponding to the second frequency, so that the pixel driving circuit controls the light emitting element to emit light according to the second control signal.
Specifically, after the second control signal is obtained through S502-S503, the second control signal is input to the pixel driving circuit, and when the pixel driving circuit receives the control signal and switches from the first control signal corresponding to the first frequency to the second control signal, the light emitting element is controlled to emit light according to the second control signal.
The variable-frequency refresh method provided by this embodiment describes in detail a possible implementation manner of generating the second control signal, and the control signal generated by the method makes the light emitting time of the pixel driving circuit in one light emitting period shortened when the refresh frequency is switched from the high frequency to the low frequency, so as to adjust the brightness at the low frequency, thereby solving the problem of screen flashing during frequency switching in the prior art.
Fig. 7 is a schematic flow chart of a third embodiment of the variable frequency refresh method provided in the present invention. The frequency conversion refresh method provided in this embodiment may still be applied to the signal input device shown in fig. 3, and this embodiment describes in detail another possible implementation manner of generating the second control signal in the foregoing embodiment, as shown in fig. 5, the frequency conversion refresh method provided in this embodiment includes:
s701, acquiring the frame refreshing frequency.
The implementation of S701 may refer to S501 in the above embodiment, which is not described again in the present invention. The process of generating the second control signal from the first control signal in the present embodiment is described below by S702 to S704.
S702, when the picture refreshing frequency is changed from the first frequency to the second frequency, the period of the first scanning signal is prolonged according to the proportional relation between the first frequency and the second frequency, and a second scanning signal is obtained.
The specific implementation manner of S702 is referred to S502 in the above embodiment, and the details of the present invention are not repeated herein.
S703, according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first light-emitting signal to obtain a second light-emitting signal, wherein the cut-off time of the second light-emitting signal is longer than the cut-off time of the first light-emitting signal.
In one possible implementation, since the light emission signal is in an off state in the reset phase and the compensation phase, i.e., the phase in which the scan signal is at the low level, the off time of the light emission signal can be increased by lengthening the time of the off state. Referring to fig. 8, the cut-off time of the light-emitting signal can be increased by prolonging the time of the high level in the EM signal corresponding to 120Hz, so that the brightness at low frequency is adjusted, and the problem of screen flicker during frequency switching in the prior art is solved.
S704, determining the second control signal according to the second scan signal and the second light emitting signal.
Specifically, the second scan signal is obtained in S702, and after the second light-emitting signal is obtained in S703, the second scan signal and the second light-emitting signal may be determined as the control signal corresponding to the second frequency. Referring to fig. 6, after S1, S2 and S3 corresponding to 120Hz are elongated by S702 to obtain elongated S1, S2 and S3, and EM corresponding to 120Hz is elongated to obtain elongated EM, the elongated S1, S2, S3 and EM may be used as control signals corresponding to 60 Hz. When the picture refreshing frequency is reduced from 120Hz to 60Hz, although the storage capacitor in the pixel driving circuit is not matched with 60Hz, the on-time of the light-emitting signal is shortened, so that the light-emitting time of the pixel driving circuit is shortened, the brightness at low frequency is adjusted, and the problem of screen flashing during frequency switching in the prior art is solved.
S705, switching a control signal input to the pixel driving circuit from a first control signal corresponding to a first frequency to a second control signal corresponding to a second frequency, so that the pixel driving circuit controls the light emitting element to emit light according to the second control signal.
Specifically, after the second control signal is obtained through S702 to S704, the second control signal is input to the pixel driving circuit. The pixel driving circuit can comprise a reset module, a compensation module, a light-emitting control module and a driving transistor, wherein in the reset stage, the reset module resets the grid voltage of the driving transistor according to the second scanning signal; in the compensation stage, the compensation module rewrites the grid voltage of the driving transistor according to the second scanning signal; in the light-emitting stage, the light-emitting control module controls the light-emitting element to emit light according to a second light-emitting signal, and the cut-off time of the second light-emitting signal is longer than the cut-off time of the light-emitting signal in the first control signal. Optionally, the driving transistor may be a P-type thin film transistor, and the specific designs of the reset module, the compensation module, the light-emitting control module, and the driving transistor may participate in the prior art, for example, the design shown in fig. 1 may be adopted, and details of the present invention are not repeated.
Another possible implementation manner of generating the second control signal is described in detail in the variable frequency refresh method provided by this embodiment, and by the control signal generated by the above method, when the refresh frequency is switched from the high frequency to the low frequency, the light emitting time of the pixel driving circuit in one light emitting period is shortened, and brightness at the low frequency is adjusted, thereby solving the problem of screen flashing during frequency switching in the prior art.
Fig. 9 is a schematic structural diagram of the variable frequency refresh apparatus provided in the present invention. The frequency conversion refreshing device can be applied to the signal input equipment in fig. 3, and comprises:
an obtaining module 901, configured to obtain a refresh frequency;
the input module 902 is configured to switch a control signal input to the pixel driving circuit from a first control signal corresponding to a first frequency to a second control signal corresponding to a second frequency when the frame refresh frequency is changed from the first frequency to the second frequency, so that the pixel driving circuit controls the light emitting element to emit light according to the second control signal.
Optionally, the variable frequency refresh apparatus further includes:
a generating module 903, configured to generate the second control signal according to a proportional relationship between the first frequency and the second frequency and the first control signal.
Optionally, the first control signal includes a first scanning signal and a first light emitting signal; the generating module 903 is specifically configured to:
according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first scanning signal to obtain a second scanning signal, wherein the conduction time of the second scanning signal is the same as the conduction time of the first scanning signal;
and determining the second control signal according to the first light-emitting signal and the second scanning signal.
Optionally, the first control signal includes a first scanning signal and a first light emitting signal; the generating module 903 is specifically configured to:
according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first scanning signal to obtain a second scanning signal, wherein the conduction time of the second scanning signal is the same as the conduction time of the first scanning signal;
according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first light-emitting signal to obtain a second light-emitting signal, wherein the cut-off time of the second light-emitting signal is longer than that of the first light-emitting signal;
and determining the second control signal according to the second scanning signal and the second light-emitting signal.
Optionally, the generating module 903 is specifically configured to:
according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first reset signal to obtain a second reset signal, wherein the conduction time of the second reset signal is the same as the conduction time of the first reset signal;
according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first compensation signal to obtain a second compensation signal, wherein the conduction time of the second compensation signal is the same as that of the first compensation signal;
and determining the second scanning signal according to the second reset signal and the second compensation signal.
Optionally, the second reset signal corresponds to an on state of the second reset signal when the second reset signal is at a low level, and corresponds to an off state of the second reset signal when the second reset signal is at a high level; the second compensation signal corresponds to an on state of the second compensation signal when the second compensation signal is at a low level, and corresponds to an off state of the second compensation signal when the second compensation signal is at a high level.
The variable frequency refresh apparatus provided in this embodiment may be configured to perform the steps in any of the above method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 10 is a schematic diagram of a hardware structure of the electronic device provided in the present invention. As shown in fig. 10, the electronic device of the present embodiment may include:
memory 1001 for storing program instructions.
The processor 1002 is configured to implement the frequency conversion refresh method described in any of the above embodiments when the program instruction is executed, and specific implementation principles may refer to the above embodiments, which are not described herein again.
The present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the variable frequency refresh method described in any of the above embodiments.
The present invention also provides a program product comprising a computer program stored in a readable storage medium, from which the computer program can be read by at least one processor, the execution of which by the at least one processor causes an electronic device to implement the variable frequency refresh method described in any of the above embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A variable frequency refresh method, comprising:
acquiring a picture refreshing frequency;
when the picture refreshing frequency is changed from a first frequency to a second frequency, switching a control signal input into a pixel driving circuit from a first control signal corresponding to the first frequency to a second control signal corresponding to the second frequency so that the pixel driving circuit controls a light-emitting element to emit light according to the second control signal;
the first frequency is greater than the second frequency, the cut-off time of the light-emitting signal in the second control signal is greater than the cut-off time of the light-emitting signal in the first control signal, and the storage capacitor in the input pixel driving circuit is matched with the first frequency.
2. The method of claim 1, wherein before switching the control signal input to the pixel driving circuit from the first control signal corresponding to the first frequency to the second control signal corresponding to the second frequency, the method further comprises:
and generating the second control signal according to the proportional relation between the first frequency and the second frequency and the first control signal.
3. The method of claim 2, wherein the first control signal comprises a first scan signal and a first light emitting signal;
the generating the second control signal according to the proportional relationship between the first frequency and the second frequency and the first control signal includes:
according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first scanning signal to obtain a second scanning signal, wherein the conduction time of the second scanning signal is the same as the conduction time of the first scanning signal;
and determining the second control signal according to the first light-emitting signal and the second scanning signal.
4. The method of claim 2, wherein the first control signal comprises a first scan signal and a first light emitting signal;
the generating the second control signal according to the proportional relationship between the first frequency and the second frequency and the first control signal includes:
according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first scanning signal to obtain a second scanning signal, wherein the conduction time of the second scanning signal is the same as the conduction time of the first scanning signal;
according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first light-emitting signal to obtain a second light-emitting signal, wherein the cut-off time of the second light-emitting signal is longer than that of the first light-emitting signal;
and determining the second control signal according to the second scanning signal and the second light-emitting signal.
5. The method of claim 3 or 4, wherein the first scanning signal comprises: a first reset signal and a first compensation signal;
the extending the period of the first scanning signal according to the proportional relationship between the first frequency and the second frequency to obtain a second scanning signal includes:
according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first reset signal to obtain a second reset signal, wherein the conduction time of the second reset signal is the same as the conduction time of the first reset signal;
according to the proportional relation between the first frequency and the second frequency, prolonging the period of the first compensation signal to obtain a second compensation signal, wherein the conduction time of the second compensation signal is the same as that of the first compensation signal;
and determining the second scanning signal according to the second reset signal and the second compensation signal.
6. The method according to claim 5, wherein the second reset signal is at a low level corresponding to an on state of the second reset signal, and the second reset signal is at a high level corresponding to an off state of the second reset signal; the second compensation signal corresponds to an on state of the second compensation signal when the second compensation signal is at a low level, and corresponds to an off state of the second compensation signal when the second compensation signal is at a high level.
7. A pixel driving method applied to a pixel driving circuit including a storage capacitor and a light emitting element, the storage capacitor being matched to a first frequency, the method comprising:
when the control signal received by the pixel driving circuit is switched from a first control signal corresponding to the first frequency to a second control signal corresponding to a second frequency, the pixel driving circuit controls the light-emitting element to emit light according to the second control signal, wherein the first frequency is greater than the second frequency, and the cut-off time of the light-emitting signal in the second control signal is greater than the cut-off time of the light-emitting signal in the first control signal.
8. The method of claim 7, wherein the pixel driving circuit further comprises a reset module, a compensation module, a light emitting control module, and a driving transistor, and wherein the second control signal comprises: a second scan signal and a second light emission signal;
the pixel driving circuit controls the light emitting element to emit light according to the second control signal, and comprises:
in a reset stage, the reset module resets the grid voltage of the driving transistor according to the second scanning signal;
in the compensation stage, the compensation module rewrites the grid voltage of the driving transistor according to the second scanning signal;
in the light-emitting stage, the light-emitting control module controls the light-emitting element to emit light according to the second light-emitting signal, and the cut-off time of the second light-emitting signal is longer than the cut-off time of the light-emitting signal in the first control signal.
9. A variable frequency refresh device, comprising:
the acquisition module is used for acquiring the refreshing frequency;
the input module is used for switching a control signal input into the pixel driving circuit from a first control signal corresponding to a first frequency to a second control signal corresponding to a second frequency when the picture refreshing frequency is changed from the first frequency to the second frequency, so that the pixel driving circuit controls the light-emitting element to emit light according to the second control signal;
the first frequency is greater than the second frequency, the cut-off time of the light-emitting signal in the second control signal is greater than the cut-off time of the light-emitting signal in the first control signal, and the storage capacitor in the input pixel driving circuit is matched with the first frequency.
10. An electronic device, comprising:
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to implement the method of any of claims 1-6 via execution of the executable instructions.
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