CN113299244A - Voltage control module, driving method and display device - Google Patents
Voltage control module, driving method and display device Download PDFInfo
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- CN113299244A CN113299244A CN202110564674.4A CN202110564674A CN113299244A CN 113299244 A CN113299244 A CN 113299244A CN 202110564674 A CN202110564674 A CN 202110564674A CN 113299244 A CN113299244 A CN 113299244A
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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
- G09G3/3258—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 with pixel circuitry controlling the voltage across the light-emitting element
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a voltage control module, a driving method and a display device. The voltage control module comprises a control circuit; the light emission control signal generation circuit includes M light emission control start signal generation sub-circuits; m is an integer greater than 1; m is a positive integer less than or equal to M; the grid driving circuit comprises M grid driving starting signal generating sub-circuits; the control circuit is used for controlling the electric potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage according to the mth light-emitting control starting signal and the mth gate drive starting signal when the mth display screen stops displaying, and then controlling and maintaining the electric potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage. The invention can save power consumption.
Description
Technical Field
The invention relates to the technical field of display, in particular to a voltage control module, a driving method and a display device.
Background
When an existing display device comprising at least two display screens works, when at least one display screen stops working, a corresponding grid driving starting signal and a corresponding light emitting control starting signal need to be provided for the display screen which stops working, and the potential of the grid driving starting signal and the potential of the light emitting control starting signal are high voltage, so that the problem of high power consumption is caused.
Disclosure of Invention
The invention mainly aims to provide a voltage control module, a driving method and a display device, and solves the problem that when the existing display device comprising at least two display screens works, and when at least one display screen stops working, a corresponding grid driving starting signal and a corresponding light emitting control starting signal (the potential of the grid driving starting signal and the potential of the light emitting control starting signal are high voltage) need to be provided for the display screen which stops working, so that the power consumption is high.
The embodiment of the invention provides a voltage control module which is applied to a display device, wherein the display device comprises M display screens, and M is an integer greater than 1; the display device also comprises a light-emitting control signal generation circuit and a grid drive circuit; the voltage control module comprises a control circuit;
the light-emitting control signal generating circuit comprises M light-emitting control starting signal generating sub-circuits, and the mth light-emitting control starting signal generating sub-circuit is used for generating and outputting the mth light-emitting control starting signal through the mth first starting signal end; m is a positive integer less than or equal to M;
the gate driving circuit comprises M gate driving starting signal generating sub-circuits, and the mth gate driving starting signal generating sub-circuit is used for generating and outputting the mth gate driving starting signal through the mth second starting signal end;
the control circuit is used for controlling the electric potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage according to the mth light-emitting control starting signal and the mth gate drive starting signal when the mth display screen stops displaying, and then controlling and maintaining the electric potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage.
Optionally, the control circuit comprises an RS latch;
the reset end of the RS latch is electrically connected with the mth first starting signal end, the set end of the RS latch is electrically connected with the mth second starting signal end, and the normal phase output end of the RS latch is electrically connected with the light-emitting control starting signal input end of the mth display screen.
Optionally, the control circuit includes M control sub-circuits; the control sub-circuit corresponds to the display screen; the display screen corresponds to the corresponding first starting signal end and the corresponding second starting signal end respectively;
the control sub-circuit is used for controlling the electric potential of the light-emitting control starting signal provided to the corresponding display screen to be invalid voltage according to the light-emitting control starting signal provided by the corresponding first starting signal end and the gate drive starting signal provided by the corresponding second starting signal end when the corresponding display screen stops displaying, and then controlling and maintaining the electric potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage.
Optionally, the mth control sub-circuit includes an mth RS latch;
the reset end of the mth RS latch is electrically connected with the mth first initial signal end, the set end of the mth RS latch is electrically connected with the mth second initial signal end, and the positive phase output end of the mth RS latch is electrically connected with the light emitting control initial signal input end of the mth display screen.
The invention also provides a driving module, which comprises a light-emitting control signal generating circuit, a grid driving circuit and the voltage control module;
the light-emitting control signal generating circuit comprises M light-emitting control starting signal generating sub-circuits, and the mth light-emitting control starting signal generating sub-circuit is used for generating and outputting the mth light-emitting control starting signal through the mth first starting signal end; m is a positive integer less than or equal to M;
the gate driving circuit comprises M gate driving starting signal generating sub-circuits, and the mth gate driving starting signal generating sub-circuit is used for generating and outputting the mth gate driving starting signal through the mth second starting signal end;
m is an integer greater than 1; m is a positive integer less than or equal to M.
The invention also provides a driving method applied to the driving module, and the driving method comprises the following steps: when the display of the m-th display screen is stopped,
the control circuit controls the potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage according to the mth light-emitting control starting signal and the mth grid drive starting signal; then, the control circuit controls and maintains the electric potential of the light-emitting control starting signal provided to the mth display screen as an invalid voltage;
m is an integer greater than 1; m is a positive integer less than or equal to M.
Optionally, the work cycle of the mth display screen includes a display stage and a display stop stage; the display phase comprises a data writing time period and a light emitting time period; the driving method includes:
in the data writing stage, the control circuit controls the potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage according to the mth light-emitting control starting signal and the mth gate drive starting signal;
in the light-emitting time period, the control circuit controls the potential of the light-emitting control starting signal provided to the mth display screen to be effective voltage according to the mth light-emitting control starting signal and the mth gate drive starting signal;
in the display stopping stage, the control circuit controls the potential of the light emitting control starting signal provided to the mth display screen to be an invalid voltage according to the mth light emitting control starting signal and the mth gate driving starting signal, and then controls the potential of the light emitting control starting signal provided to the mth display screen to be maintained to be the invalid voltage.
Optionally, the control circuit comprises an RS latch; the reset end of the RS latch is electrically connected with the mth first starting signal end, the setting end of the RS latch is electrically connected with the mth second starting signal end, and the positive phase output end of the RS latch is electrically connected with the light-emitting control starting signal input end of the mth display screen; the display stopping stage comprises a latch setting time period, a latch holding time period and a maintaining time period which are sequentially arranged; the driving method includes:
in the latch setting time period, setting the mth gate drive starting signal as a low-voltage signal, setting the mth light-emitting control starting signal as a high-voltage signal, and outputting the high-voltage signal to the light-emitting control starting signal input end of the mth display screen through the normal-phase output end of the RS latch;
in the latch holding time period, setting the mth gate drive starting signal as a high voltage signal, wherein the mth light emission control starting signal is a high voltage signal, and the RS latch outputs the high voltage signal to a light emission control starting signal input end of the mth display screen through a positive phase output end of the RS latch;
in the maintaining time period, stopping providing the mth light-emitting control starting signal, and maintaining the RS latch to provide a high-voltage signal to the light-emitting control starting signal input end of the mth display screen through the normal-phase output end of the RS latch;
the effective voltage signal is a low voltage signal and the ineffective voltage signal is a high voltage signal.
Optionally, the control circuit includes M control sub-circuits; the mth control sub-circuit comprises an mth RS latch; the reset end of the mth RS latch is electrically connected with the mth first initial signal end, the set end of the mth RS latch is electrically connected with the mth second initial signal end, and the positive phase output end of the mth RS latch is electrically connected with the light emitting control initial signal input end of the mth display screen; the display stopping stage comprises a latch setting time period, a latch holding time period and a maintaining time period which are sequentially arranged; the driving method includes:
in the latch setting time period, setting the mth gate drive starting signal as a low-voltage signal, setting the mth light-emitting control starting signal as a high-voltage signal, and outputting the high-voltage signal to the light-emitting control starting signal input end of the mth display screen through the normal-phase output end of the RS latch;
in the latch holding time period, setting the mth gate drive starting signal as a high voltage signal, wherein the mth light emission control starting signal is a high voltage signal, and the RS latch outputs the high voltage signal to a light emission control starting signal input end of the mth display screen through a positive phase output end of the RS latch;
in the maintaining time period, stopping providing the mth light-emitting control starting signal, and maintaining the RS latch to provide a high-voltage signal to the light-emitting control starting signal input end of the mth display screen through the normal-phase output end of the RS latch;
the effective voltage signal is a low voltage signal and the ineffective voltage signal is a high voltage signal.
The invention also provides a display device, which comprises M display screens and the driving module; m is an integer greater than 1.
When the voltage control module, the driving method, and the display device described in the embodiments of the present invention are in operation, when the mth display screen just stops displaying, the control circuit controls the potential of the light emission control start signal provided to the mth display screen to be an invalid voltage (the invalid voltage may be a high voltage, but not limited to the high voltage) according to the mth light emission control start signal and the mth gate driving start signal, and then the mth light emission control start signal generation sub-circuit may stop providing the mth light emission control start signal.
Drawings
Fig. 1 is a block diagram of a voltage control module according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a voltage control module according to at least one embodiment of the invention;
FIG. 3 is a circuit diagram of an RS latch;
FIG. 4 is a block diagram of a display device according to at least one embodiment of the invention;
FIG. 5 is a circuit diagram of at least one embodiment of a pixel circuit employed by a display device according to an embodiment of the invention;
fig. 6 is a circuit diagram of at least one embodiment of a second emission control start signal generation sub-circuit in the emission control signal generation circuit of the display device according to the embodiment of the present invention, and a connection diagram between the second emission control start signal generation sub-circuit and the RS latch;
FIG. 7 is a timing diagram illustrating operation of at least one embodiment of the display module shown in FIG. 4;
FIG. 8 is a timing diagram of ESTV1 and GSTV1 when the full screen display is performed in at least one embodiment of the display apparatus shown in FIG. 4;
FIG. 9 is a timing diagram of the ESTV2 and the GSTV2 shown in FIG. 9 when the full screen display is performed in at least one embodiment of the display apparatus shown in FIG. 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
The transistors used in all embodiments of the present invention may be transistors, thin film transistors, or field effect transistors or other devices with the same characteristics. In the embodiment of the present invention, in order to distinguish two poles of the transistor except the control pole, one pole is called a first pole, and the other pole is called a second pole.
In practical operation, when the transistor is a triode, the control electrode may be a base electrode, the first electrode may be a collector electrode, and the second electrode may be an emitter electrode; alternatively, the control electrode may be a base electrode, the first electrode may be an emitter electrode, and the second electrode may be a collector electrode.
In practical operation, when the transistor is a thin film transistor or a field effect transistor, the control electrode may be a gate electrode, the first electrode may be a drain electrode, and the second electrode may be a source electrode; alternatively, the control electrode may be a gate electrode, the first electrode may be a source electrode, and the second electrode may be a drain electrode.
The voltage control module is applied to a display device, wherein the display device comprises M display screens, and M is an integer greater than 1; the display device also comprises a light-emitting control signal generation circuit and a grid drive circuit; the voltage control module comprises a control circuit;
the light-emitting control signal generating circuit comprises M light-emitting control starting signal generating sub-circuits, and the mth light-emitting control starting signal generating sub-circuit is used for generating and outputting the mth light-emitting control starting signal through the mth first starting signal end; m is a positive integer less than or equal to M;
the gate driving circuit comprises M gate driving starting signal generating sub-circuits, and the mth gate driving starting signal generating sub-circuit is used for generating and outputting the mth gate driving starting signal through the mth second starting signal end;
the control circuit is used for controlling the electric potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage according to the mth light-emitting control starting signal and the mth gate drive starting signal when the mth display screen stops displaying, and then controlling and maintaining the electric potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage.
When the voltage control module according to the embodiment of the present invention is in operation, when the mth display screen just stops displaying, the control circuit controls the potential of the light emission control start signal provided to the mth display screen to be an invalid voltage (the invalid voltage may be a high voltage, but not limited thereto) according to the mth light emission control start signal and the mth gate driving start signal, and then the mth light emission control start signal generation sub-circuit may stop providing the mth light emission control start signal.
In at least one embodiment of the present invention, when the mth display screen included in the display device stops displaying, the mth gate driving start signal generation sub-circuit needs to provide the mth gate driving start signal to the mth display screen because the gate driving start signal has a large influence on the operation of the display screen.
As shown in fig. 1, when the mth display screen included in the display apparatus may be in a display state or a display stop state, the voltage control module includes a control circuit 10;
the mth light emission control start signal generating sub-circuit 1m is for generating and outputting the mth light emission control start signal estwm through the mth first start signal terminal; m is a positive integer less than or equal to M;
the mth gate driving start signal generating sub-circuit 2m is configured to generate and output the mth gate driving start signal GSTVm through an mth second start signal terminal;
the control circuit 10 is electrically connected to the mth first start signal terminal, the mth second start signal terminal, and the light emission control start signal input terminal EIm of the mth display screen, and is configured to control the potential of the light emission control start signal supplied to EIm to be an invalid voltage according to the mth light emission control start signal estwm and the mth gate drive start signal GSTVm when the mth display screen stops displaying, and then control the potential of the light emission control start signal supplied to EIm to be the invalid voltage.
According to a specific implementation manner, when the voltage control module according to the embodiment of the present invention works, the display device includes a plurality of display screens, wherein not all of the display screens may stop displaying; for example, when the display device includes a first display screen and a second display screen, the second display screen may be selected to be in a display state or a stop display state while the display device is operating, and the first display screen may be in the display state all the time.
According to another specific implementation manner, when the voltage control module according to the embodiment of the invention operates, the display device includes a plurality of display screens, and each display screen in the display device may be in a display state or a display stop state when the display device operates.
Optionally, the control circuit comprises an RS latch;
the reset end of the RS latch is electrically connected with the mth first starting signal end, the set end of the RS latch is electrically connected with the mth second starting signal end, and the normal phase output end of the RS latch is electrically connected with the light-emitting control starting signal input end of the mth display screen.
In a specific implementation, when the mth display screen in the display device can be selected to be in the display state or the display stop state, the control circuit may include an RS latch (the RS latch is a latch formed by cross-coupling two nand gates and is capable of holding a signal), and the RS latch may provide a light emission control start signal for the mth display screen through a non-inverting output terminal thereof according to the mth light emission control start signal and the mth gate driving start signal.
In at least one embodiment of the present invention, the RS latch needs to input a high level signal at an interval when the RS latch is actually used, so as to ensure that the RS latch can maintain outputting the high level signal.
As shown in fig. 2, on the basis of the embodiment of the voltage control module shown in fig. 1, the control circuit may include an RS latch 20;
a reset terminal R of the RS latch 20 is electrically connected to the mth first start signal terminal, and is configured to receive the mth light emission control start signal estwm;
the set end S of the RS latch 20 is electrically connected to the mth second start signal end, and is configured to receive the mth gate drive start signal GSTVm;
the non-inverting output terminal Q of the RS latch 20 is electrically connected to the light emission control start signal input terminal EIm of the mth display screen.
In operation of the RS latch 20,
when the reset end R is connected with a low-voltage signal and the set end S is connected with a high-voltage signal, the normal phase output end Q outputs the low-voltage signal;
when the reset end R is connected with a high-voltage signal and the set end S is connected with a low-voltage signal, the normal phase output end Q outputs the high-voltage signal;
when the reset end R is connected with a high-voltage signal and the set end S is connected with the high-voltage signal, the signal output by the positive phase output end Q is kept in the original state;
when the reset terminal is connected with a low-voltage signal and the set terminal S is connected with the low-voltage signal, the state of the signal output by the positive phase output terminal Q is uncertain.
Fig. 3 is a circuit diagram of an RS latch.
The truth table for the RS latch is as follows:
as shown in fig. 4, the display device may include a control circuit 10, a first display screen B, and a second display screen a;
the display device further includes a light emission control signal generation circuit 31 and a gate drive circuit 32;
a first light emission control start signal generating sub-circuit in the light emission control signal generating circuit 31 for providing a first light emission control start signal escv 1 for the first display panel B, and a first gate driving start signal generating sub-circuit in the gate driving circuit 32 for providing a first gate driving start signal GSTV1 for the first display panel B;
a second gate driving start signal generating sub-circuit in the gate driving circuit 32 is configured to provide a second gate driving start signal GSTV2 for the second display screen a;
the control circuit 10 is electrically connected to the second emission control start signal generation sub-circuit in the emission control signal generation circuit 31, the second gate drive start signal generation sub-circuit in the gate drive circuit 32, and the emission control start signal input terminal EI2 of the second display panel a, respectively, for controlling the potential of the emission control start signal of the EI2 supplied to the second display panel a to be an inactive voltage first according to the second emission control start signal escv 2 and the second gate drive start signal GSTV2 when the second display panel a stops displaying, and then controlling the potential of the emission control start signal of the EI2 supplied to the second display panel a to be an inactive voltage.
In operation of at least one embodiment of the display apparatus shown in fig. 4, in normal full-screen operation, the ESTV1 and GSTV1 can independently control the lighting and data loading of the first display B, and the second lighting control start signal provided by EI2 and GSTV2 can independently control the lighting and data loading of the second display a.
In at least one embodiment of the present invention, the inactive voltage may be a voltage that turns off the corresponding row gate line and the corresponding row light emission control line; for example, when the light emission control transistor (the control electrode of the light emission control transistor is connected to the light emission control signal) and the data writing transistor (the control electrode of the data writing transistor is connected to the gate driving signal) are p-type transistors, the inactive voltage may be a high voltage; when the light emission control transistor and the data writing transistor are n-type transistors, the inactive voltage may be a low voltage.
Fig. 5 is a circuit diagram of at least one embodiment of a pixel circuit employed by the display device.
In fig. 5, a data writing transistor is denoted by reference numeral T4, a first light emission controlling transistor is denoted by reference numeral T5, and a second light emission controlling transistor is denoted by reference numeral T6;
a storage capacitor denoted by reference numeral C, a first initialization transistor denoted by reference numeral T1, a second initialization transistor denoted by reference numeral T2, a control electrode of T1 electrically connected to the first Reset line Reset (N), and a control electrode of T7 electrically connected to the second Reset line Reset (N + 1); the label Init is an initial voltage end;
a compensation control transistor denoted by a reference numeral T2, and a driving transistor denoted by a reference numeral T3;
the mark number is Gate line, the mark number is EM is luminous control line; a high voltage is denoted by VDD, a low voltage is denoted by VSS, a data voltage supplied to the data line is denoted by Vdata, and an organic light emitting diode is denoted by O1.
In at least one embodiment of the pixel circuit shown in fig. 5, all of the transistors may be p-type transistors.
While in at least one embodiment of the display device shown in fig. 4, the pixel circuits employed in the first display panel B and the second display panel a are structured as shown in fig. 5,
when the display apparatus shown in fig. 4 is driven in half-screen mode, the first display panel B is turned on, the second display panel a is turned off, and the second light-emission control start signals provided by GSTV2 and EI2 are continuously pulled high; as shown in fig. 5, T5, T6, T4 and T2 are all turned off, data cannot be loaded, and the first and second light emission control transistors are normally closed. The control circuit in the voltage control module according to the embodiment of the present invention may control the potential of the light emission control start signal of EI2 provided to the second display screen a to be an invalid voltage according to the second light emission control start signal ESTV2 and the second gate driving start signal GSTV2 when the second display screen a stops displaying, and then the control circuit may control the potential of the light emission control start signal of EI2 provided to the second display screen a to be an invalid voltage even if the ESTV2 disappears (i.e., the second light emission control start signal generation sub-circuit does not provide the ESTV2), so as to save power consumption.
In at least one embodiment of the present invention, the control circuit may include M control sub-circuits; the control sub-circuit corresponds to the display screen; the display screen corresponds to the corresponding first starting signal end and the corresponding second starting signal end respectively;
the control sub-circuit is used for controlling the electric potential of the light-emitting control starting signal provided to the corresponding display screen to be invalid voltage according to the light-emitting control starting signal provided by the corresponding first starting signal end and the gate drive starting signal provided by the corresponding second starting signal end when the corresponding display screen stops displaying, and then controlling and maintaining the electric potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage.
In a specific implementation, the display device includes M display panels, and the control circuit may include M control sub-circuits, that is, when the display device is in operation, each display panel included in the display device may select to display or stop displaying, and each display panel may correspond to one control sub-circuit, a corresponding light-emitting control start signal provided by a first start signal terminal, and a corresponding gate driving start signal provided by a second start signal terminal.
Optionally, the mth control sub-circuit includes an mth RS latch;
the reset end of the mth RS latch is electrically connected with the mth first initial signal end, the set end of the mth RS latch is electrically connected with the mth second initial signal end, and the positive phase output end of the mth RS latch is electrically connected with the light emitting control initial signal input end of the mth display screen.
As shown in fig. 6, in at least one embodiment of the display device shown in fig. 4, the control circuit includes an RS latch 20;
the second light emission control start signal generation sub-circuit in the light emission control signal generation circuit may include a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a fifth transistor M5, a sixth transistor M6, a seventh transistor M7, an eighth transistor M8, a ninth transistor M9, a tenth transistor M10, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4.
In fig. 6, reference numeral VGL is low, reference numeral VGH is high, reference numeral ECK is a first clock signal, reference numeral ECB is a second clock signal, reference numeral GND is a ground terminal, and reference numeral Input is an Input terminal.
The drain of M9 is electrically connected with the source of M10, and the drain of M9 is used for outputting ESTV 2;
the reset end R of the RS latch 20 is accessed to the ESTV2, and the set end S of the RS latch 20 is accessed to the GSTV 2;
the non-inverting output Q of the RS latch 20 is electrically connected to EI 2.
When the display module shown in fig. 4 is in operation, the working cycle of the second display screen a includes a display phase and a display stop phase; as shown in fig. 7, the display phase includes a data writing period S11 and a light emitting period S12; the stop display phase includes a latch set period S21, a latch hold period S22, and a sustain period S23 that are sequentially set;
in the data writing phase S11, the espv 2 is a high voltage signal, the GSTV2 is a low voltage signal, and the RS latch 20 outputs the high voltage signal to the light emission control start signal input terminal EI2 of the second display panel a through the non-inverting output terminal Q according to the espv 2 and GSTV 2;
in the lighting period S12, the espv 2 is a low voltage signal, the GSTV2 is a high voltage signal, and the RS latch 20 outputs the low voltage signal to the lighting control start signal input terminal EI2 of the second display a through the non-inverting output terminal Q according to the espv 2 and GSTV 2;
in the latch set time period S21, setting GSTV2 as a low voltage signal, espv 2 as a high voltage signal, and the RS latch 20 outputs the high voltage signal to the light emission control start signal input terminal EI2 of the second display screen a through the non-inverting output terminal Q according to the espv 2 and GSTV 2;
in the latch hold period S22, the GSTV2 is set to a high voltage signal, the ESTV2 is a high voltage signal, and the RS latch 20 outputs the high voltage signal through its non-inverting output terminal Q to the emission control start signal input terminal EI2 of the second display screen a;
in the sustain period S23, the second light emission control start signal generating sub-circuit stops supplying the m-th light emission control start signal, and the RS latch 20 maintains supplying the high voltage signal to the light emission control start signal input terminal E2 of the second display panel a through the non-inverting output terminal Q thereof, so that power consumption can be saved.
In a specific implementation, in the latch set time period S21, the RS latch may be controlled independently by an IC (integrated circuit) to output a set of signals alone, instead of setting via the GSTV2, so that the set latch effect is also achieved.
After the at least one embodiment of the display apparatus shown in fig. 4 is folded, the second display screen a stops displaying, and the RS latch 20 can output a high voltage signal to the EI2 through the non-inverting output terminal Q according to the escv 2 and the GSTV 2; thereafter, even if the escv 2 disappears, the RS latch 20 can output a high voltage signal through its non-inverting output terminal Q, and thus power consumption can be reduced to some extent.
As shown in fig. 7, the latch set period S21 is added in timing. If the latch set period S21 is not increased, the RS latch latches the potential of the light emission control start signal supplied to the light emission control start signal input terminal EI2 of the second display panel a at a low level at the time of half-panel drive switching. The latch set time period S21 is short in duration, and does not cause data inflow, if data flows in, the screen is not displayed due to the closing of T5 in fig. 5, and when the screen is switched to the full screen, the screen is reset by the reset signal, and the display is not affected.
In fig. 7, reference sign ECK is a first clock signal, reference sign ECB is a second clock signal,
at least one embodiment of the display apparatus shown in fig. 4 can optimize the circuit to support driving other GOA signals and increase the pushing force during the folding of the second display screen a by the escv 2 and GSTV 2.
In at least one embodiment of the display apparatus shown in fig. 4, when a full screen display is performed, the timing diagrams of the ESTV1 and the GSTV1 are shown in fig. 8, and the timing diagrams of the ESTV2 and the GSTV2 are shown in fig. 9.
The driving module comprises a light-emitting control signal generating circuit, a grid driving circuit and the voltage control module;
the light-emitting control signal generating circuit comprises M light-emitting control starting signal generating sub-circuits, and the mth light-emitting control starting signal generating sub-circuit is used for generating and outputting the mth light-emitting control starting signal through the mth first starting signal end; m is a positive integer less than or equal to M;
the gate driving circuit comprises M gate driving starting signal generating sub-circuits, and the mth gate driving starting signal generating sub-circuit is used for generating and outputting the mth gate driving starting signal through the mth second starting signal end;
m is an integer greater than 1; m is a positive integer less than or equal to M.
When the driving module described in the embodiment of the present invention is in operation, when the mth display screen just stops displaying, the control circuit in the voltage control module controls the potential of the light emission control start signal provided to the mth display screen to be an invalid voltage (the invalid voltage may be a high voltage, but not limited to the high voltage) according to the mth light emission control start signal and the mth gate driving start signal, and then the mth light emission control start signal generation sub-circuit may stop providing the mth light emission control start signal.
The driving method provided by the embodiment of the invention is applied to the driving module, and comprises the following steps: when the display of the m-th display screen is stopped,
the control circuit controls the potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage according to the mth light-emitting control starting signal and the mth grid drive starting signal; then, the control circuit controls and maintains the electric potential of the light-emitting control starting signal provided to the mth display screen as an invalid voltage;
m is an integer greater than 1; m is a positive integer less than or equal to M.
In the voltage control method according to the embodiment of the present invention, when the mth display screen is just stopped displaying, the control circuit controls the potential of the light emission control start signal provided to the mth display screen to be an invalid voltage (the invalid voltage may be a high voltage, but not limited thereto) according to the mth light emission control start signal and the mth gate driving start signal, and then the mth light emission control start signal generation sub-circuit may stop providing the mth light emission control start signal.
In specific implementation, the work cycle of the mth display screen may include a display phase and a display stop phase; the display phase comprises a data writing time period and a light emitting time period; the driving method includes:
in the data writing stage, the control circuit controls the potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage according to the mth light-emitting control starting signal and the mth gate drive starting signal;
in the light-emitting time period, the control circuit controls the potential of the light-emitting control starting signal provided to the mth display screen to be effective voltage according to the mth light-emitting control starting signal and the mth gate drive starting signal;
in the display stopping stage, the control circuit controls the potential of the light emitting control starting signal provided to the mth display screen to be an invalid voltage according to the mth light emitting control starting signal and the mth gate driving starting signal, and then controls the potential of the light emitting control starting signal provided to the mth display screen to be maintained to be the invalid voltage.
When the mth display screen works, in a data writing stage, the control circuit controls the potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage, and in a light-emitting control time period, the control circuit controls the potential of the light-emitting control starting signal provided to the mth display screen to be valid voltage; in the display stopping stage, the control circuit maintains the potential of the light-emitting control starting signal as the invalid voltage after controlling the potential of the light-emitting control starting signal provided to the mth display screen as the invalid voltage.
According to a specific embodiment, the control circuit comprises an RS latch; the reset end of the RS latch is electrically connected with the mth first starting signal end, the setting end of the RS latch is electrically connected with the mth second starting signal end, and the positive phase output end of the RS latch is electrically connected with the light-emitting control starting signal input end of the mth display screen; the display stopping stage comprises a latch setting time period, a latch holding time period and a maintaining time period which are sequentially arranged; the driving method includes:
in the latch setting time period, setting the mth gate drive starting signal as a low-voltage signal, setting the mth light-emitting control starting signal as a high-voltage signal, and outputting the high-voltage signal to the light-emitting control starting signal input end of the mth display screen through the normal-phase output end of the RS latch;
in the latch holding time period, setting the mth gate drive starting signal as a high voltage signal, wherein the mth light emission control starting signal is a high voltage signal, and the RS latch outputs the high voltage signal to a light emission control starting signal input end of the mth display screen through a positive phase output end of the RS latch;
in the maintaining time period, stopping providing the mth light-emitting control starting signal, and maintaining the RS latch to provide a high-voltage signal to the light-emitting control starting signal input end of the mth display screen through the normal-phase output end of the RS latch;
the effective voltage signal is a low voltage signal and the ineffective voltage signal is a high voltage signal.
In a specific implementation, when the mth display screen in the display device can be selected to be in the display state or the display stop state, the control circuit may include an RS latch (the RS latch is a latch formed by cross-coupling two nand gates and is capable of holding a signal), and the RS latch may provide a light emission control start signal for the mth display screen through a non-inverting output terminal thereof according to the mth light emission control start signal and the mth gate driving start signal. In the latch setting time period, the mth gate drive starting circuit is set to be a low-voltage signal, so that the RS latch can output a high-voltage signal to a light-emitting control starting signal input end of the mth display screen; in the latch holding time period, the RS latch keeps outputting a high-voltage signal to the light-emitting control starting signal input end; in the sustain period, the RS latch can sustain the supply of the high voltage signal to the light emission control start signal input terminal under the condition that the supply of the mth light emission control start signal is stopped.
According to another specific embodiment, the control circuit includes M control sub-circuits; the mth control sub-circuit comprises an mth RS latch; the reset end of the mth RS latch is electrically connected with the mth first initial signal end, the set end of the mth RS latch is electrically connected with the mth second initial signal end, and the positive phase output end of the mth RS latch is electrically connected with the light emitting control initial signal input end of the mth display screen; the display stopping stage comprises a latch setting time period, a latch holding time period and a maintaining time period which are sequentially arranged; the driving method includes:
in the latch setting time period, setting the mth gate drive starting signal as a low-voltage signal, setting the mth light-emitting control starting signal as a high-voltage signal, and outputting the high-voltage signal to the light-emitting control starting signal input end of the mth display screen through the normal-phase output end of the RS latch;
in the latch holding time period, setting the mth gate drive starting signal as a high voltage signal, wherein the mth light emission control starting signal is a high voltage signal, and the RS latch outputs the high voltage signal to a light emission control starting signal input end of the mth display screen through a positive phase output end of the RS latch;
in the maintaining time period, stopping providing the mth light-emitting control starting signal, and maintaining the RS latch to provide a high-voltage signal to the light-emitting control starting signal input end of the mth display screen through the normal-phase output end of the RS latch;
the effective voltage signal is a low voltage signal and the ineffective voltage signal is a high voltage signal.
In a specific implementation, the display device includes M display panels, and the control circuit may include M control sub-circuits, that is, when the display device is in operation, each display panel included in the display device may select to display or stop displaying, and each display panel may correspond to one control sub-circuit, a corresponding light-emitting control start signal provided by a first start signal terminal, and a corresponding gate driving start signal provided by a second start signal terminal. The mth control sub-circuit includes an mth RS latch, and the mth RS latch may provide a light emission control start signal for the mth display screen through a non-inverting output terminal thereof according to the mth light emission control start signal and the mth gate driving start signal. In the latch setting time period, the mth gate drive starting circuit is set to be a low-voltage signal, so that the RS latch can output a high-voltage signal to a light-emitting control starting signal input end of the mth display screen; in the latch holding time period, the RS latch keeps outputting a high-voltage signal to the light-emitting control starting signal input end; in the sustain period, the RS latch can sustain the supply of the high voltage signal to the light emission control start signal input terminal under the condition that the supply of the mth light emission control start signal is stopped.
The display device comprises M display screens and the driving module;
m is an integer greater than 1.
The display device provided by the embodiment of the invention can be any product or component with a display function, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A voltage control module is applied to a display device, wherein the display device comprises M display screens, and M is an integer greater than 1; the display device also comprises a light-emitting control signal generation circuit and a grid drive circuit; the voltage control module is characterized by comprising a control circuit;
the light-emitting control signal generating circuit comprises M light-emitting control starting signal generating sub-circuits, and the mth light-emitting control starting signal generating sub-circuit is used for generating and outputting the mth light-emitting control starting signal through the mth first starting signal end; m is a positive integer less than or equal to M;
the gate driving circuit comprises M gate driving starting signal generating sub-circuits, and the mth gate driving starting signal generating sub-circuit is used for generating and outputting the mth gate driving starting signal through the mth second starting signal end;
the control circuit is used for controlling the electric potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage according to the mth light-emitting control starting signal and the mth gate drive starting signal when the mth display screen stops displaying, and then controlling and maintaining the electric potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage.
2. The voltage control module of claim 1, wherein the control circuit comprises an RS latch;
the reset end of the RS latch is electrically connected with the mth first starting signal end, the set end of the RS latch is electrically connected with the mth second starting signal end, and the normal phase output end of the RS latch is electrically connected with the light-emitting control starting signal input end of the mth display screen.
3. The voltage control module of claim 1, wherein the control circuit comprises M control sub-circuits; the control sub-circuit corresponds to the display screen; the display screen corresponds to the corresponding first starting signal end and the corresponding second starting signal end respectively;
the control sub-circuit is used for controlling the electric potential of the light-emitting control starting signal provided to the corresponding display screen to be invalid voltage according to the light-emitting control starting signal provided by the corresponding first starting signal end and the gate drive starting signal provided by the corresponding second starting signal end when the corresponding display screen stops displaying, and then controlling and maintaining the electric potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage.
4. The voltage control module of claim 3, wherein the mth control sub-circuit includes an mth RS latch;
the reset end of the mth RS latch is electrically connected with the mth first initial signal end, the set end of the mth RS latch is electrically connected with the mth second initial signal end, and the positive phase output end of the mth RS latch is electrically connected with the light emitting control initial signal input end of the mth display screen.
5. A driving module comprising a light emission control signal generating circuit, a gate driving circuit, and a voltage control module according to any one of claims 1 to 4;
the light-emitting control signal generating circuit comprises M light-emitting control starting signal generating sub-circuits, and the mth light-emitting control starting signal generating sub-circuit is used for generating and outputting the mth light-emitting control starting signal through the mth first starting signal end; m is a positive integer less than or equal to M;
the gate driving circuit comprises M gate driving starting signal generating sub-circuits, and the mth gate driving starting signal generating sub-circuit is used for generating and outputting the mth gate driving starting signal through the mth second starting signal end;
m is an integer greater than 1; m is a positive integer less than or equal to M.
6. A driving method applied to the driving module set according to claim 5, the driving method comprising: when the display of the m-th display screen is stopped,
the control circuit controls the potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage according to the mth light-emitting control starting signal and the mth grid drive starting signal; then, the control circuit controls and maintains the electric potential of the light-emitting control starting signal provided to the mth display screen as an invalid voltage;
m is an integer greater than 1; m is a positive integer less than or equal to M.
7. The driving method according to claim 6, wherein the duty cycle of the mth display panel includes a display phase and a stop display phase; the display phase comprises a data writing time period and a light emitting time period; the driving method includes:
in the data writing stage, the control circuit controls the potential of the light-emitting control starting signal provided to the mth display screen to be invalid voltage according to the mth light-emitting control starting signal and the mth gate drive starting signal;
in the light-emitting time period, the control circuit controls the potential of the light-emitting control starting signal provided to the mth display screen to be effective voltage according to the mth light-emitting control starting signal and the mth gate drive starting signal;
in the display stopping stage, the control circuit controls the potential of the light emitting control starting signal provided to the mth display screen to be an invalid voltage according to the mth light emitting control starting signal and the mth gate driving starting signal, and then controls the potential of the light emitting control starting signal provided to the mth display screen to be maintained to be the invalid voltage.
8. The driving method according to claim 7, wherein the control circuit includes an RS latch; the reset end of the RS latch is electrically connected with the mth first starting signal end, the setting end of the RS latch is electrically connected with the mth second starting signal end, and the positive phase output end of the RS latch is electrically connected with the light-emitting control starting signal input end of the mth display screen; the display stopping stage comprises a latch setting time period, a latch holding time period and a maintaining time period which are sequentially arranged; the driving method includes:
in the latch setting time period, setting the mth gate drive starting signal as a low-voltage signal, setting the mth light-emitting control starting signal as a high-voltage signal, and outputting the high-voltage signal to the light-emitting control starting signal input end of the mth display screen through the normal-phase output end of the RS latch;
in the latch holding time period, setting the mth gate drive starting signal as a high voltage signal, wherein the mth light emission control starting signal is a high voltage signal, and the RS latch outputs the high voltage signal to a light emission control starting signal input end of the mth display screen through a positive phase output end of the RS latch;
in the maintaining time period, stopping providing the mth light-emitting control starting signal, and maintaining the RS latch to provide a high-voltage signal to the light-emitting control starting signal input end of the mth display screen through the normal-phase output end of the RS latch;
the effective voltage signal is a low voltage signal and the ineffective voltage signal is a high voltage signal.
9. The driving method according to claim 7, wherein the control circuit includes M control sub-circuits; the mth control sub-circuit comprises an mth RS latch; the reset end of the mth RS latch is electrically connected with the mth first initial signal end, the set end of the mth RS latch is electrically connected with the mth second initial signal end, and the positive phase output end of the mth RS latch is electrically connected with the light emitting control initial signal input end of the mth display screen; the display stopping stage comprises a latch setting time period, a latch holding time period and a maintaining time period which are sequentially arranged; the driving method includes:
in the latch setting time period, setting the mth gate drive starting signal as a low-voltage signal, setting the mth light-emitting control starting signal as a high-voltage signal, and outputting the high-voltage signal to the light-emitting control starting signal input end of the mth display screen through the normal-phase output end of the RS latch;
in the latch holding time period, setting the mth gate drive starting signal as a high voltage signal, wherein the mth light emission control starting signal is a high voltage signal, and the RS latch outputs the high voltage signal to a light emission control starting signal input end of the mth display screen through a positive phase output end of the RS latch;
in the maintaining time period, stopping providing the mth light-emitting control starting signal, and maintaining the RS latch to provide a high-voltage signal to the light-emitting control starting signal input end of the mth display screen through the normal-phase output end of the RS latch;
the effective voltage signal is a low voltage signal and the ineffective voltage signal is a high voltage signal.
10. A display device, comprising M display panels and the driving module of claim 5; m is an integer greater than 1.
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