CN109817159B - Pixel driving circuit and display device - Google Patents
Pixel driving circuit and display device Download PDFInfo
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- CN109817159B CN109817159B CN201910253242.4A CN201910253242A CN109817159B CN 109817159 B CN109817159 B CN 109817159B CN 201910253242 A CN201910253242 A CN 201910253242A CN 109817159 B CN109817159 B CN 109817159B
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Abstract
The embodiment of the invention provides a pixel driving circuit and a display device, and solves the technical problem that in the prior art, a display screen with high resolution and a large screen has low contrast. The pixel driving circuit provided by the embodiment of the invention comprises a voltage storage module, a light-emitting device and a light-emitting driving module, wherein in the stage of driving the light-emitting module to drive the light-emitting device to emit light, the voltage storage module shunts driving current generated by driving the light-emitting module, namely, the driving current charges the voltage storage module, when charging is started, the anode voltage of the light-emitting device does not reach the starting voltage of the light-emitting device, the light-emitting device does not emit light, and when the voltage storage module is charged with certain electric quantity, the light-emitting device emits light; the driving circuit of the embodiment of the invention actually prolongs the non-light-emitting time of the light-emitting device, and further reduces the average current of zero gray scale, thereby reducing the brightness of the display screen in a black picture and increasing the contrast of the display screen.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel driving circuit and a display device.
Background
At present, the resolution of the electronic product to the display screen is higher and higher, but with the increase of the size of the display screen, the charging time is reduced and the load is increased, thereby reducing the contrast of the display screen of the electronic product.
Disclosure of Invention
In view of this, embodiments of the present invention provide a pixel driving circuit and a display device, which solve the technical problem of low contrast of a display screen with high resolution and a large screen in the prior art.
For the purpose of making the objects, technical means and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, 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 application.
According to an aspect of the present invention, an embodiment of the present invention provides a pixel driving circuit, including: the driving light-emitting module, one end of the said driving light-emitting module receives the mains voltage; the light emitting device is electrically connected with the driving light emitting module and emits light under the driving of the driving light emitting module; and the voltage storage module is used for shunting the driving current generated when the driving light-emitting module drives the light-emitting device to emit light.
In one embodiment, one end of the voltage storage module is electrically connected to the anode of the light emitting device, and the other end of the voltage storage module is electrically connected to the power output terminal.
In one embodiment, the pixel driving circuit further includes: the initialization module receives a first scanning signal and controls whether the anode of the light-emitting device is connected with the output end of an initialization power supply or not according to the first scanning signal; one end of the voltage storage module is electrically connected with the anode of the light-emitting device, and the other end of the voltage storage module is electrically connected with the output end of the initialization power supply.
In one embodiment, the power supply voltage is a dc voltage.
In one embodiment, the voltage storage module includes a first capacitor.
In one embodiment, the pixel driving circuit further includes: the data storage module is used for storing data signal voltage; and the data storage control module is used for receiving a second scanning signal and controlling whether the voltage of the data signal is stored in the data storage module or not according to the second scanning signal.
In one embodiment, the data storage control module includes at least one thin film transistor.
In one embodiment, the pixel driving circuit further includes: the light-emitting control module is connected between the power output end and the anode of the light-emitting device in series, receives a light-emitting control signal, and controls whether the power output end is connected with the anode of the light-emitting device or not according to the light-emitting control signal.
In one embodiment, the pixel driving circuit further comprises: initialization module, data storage control module and light control module, wherein: the driving light-emitting module comprises a driving transistor, and the source electrode of the driving transistor is connected with the output end of the power supply; the data storage module comprises a second capacitor, one end of the second capacitor is connected with the output end of the power supply, and the other end of the second capacitor is connected with the grid electrode of the driving transistor; the data storage control module comprises a first thin film transistor and a second thin film transistor, wherein the grid electrode of the first thin film transistor and the grid electrode of the second thin film transistor receive the second scanning signal, the source electrode of the first thin film transistor receives data signal voltage, and the drain electrode of the first thin film transistor is connected with the source electrode of the driving transistor; the initialization module comprises a third thin film transistor and a fourth thin film transistor, wherein a gate of the third thin film transistor and a gate of the fourth thin film transistor both receive the first scanning signal, a source of the third thin film transistor is connected with one end of the second capacitor, a drain of the third thin film transistor receives an initialization voltage, a source of the fourth thin film transistor receives the initialization voltage, and a drain of the fourth thin film transistor is connected with an anode of the light emitting device; the light-emitting control module comprises a fifth thin film transistor and a sixth thin film transistor, wherein the grid electrode of the fifth thin film transistor and the grid electrode of the sixth thin film transistor both receive light-emitting control signals, the source electrode of the fifth thin film transistor receives power supply voltage, the drain electrode of the fifth thin film transistor is connected with the source electrode of the driving transistor, the drain electrode of the sixth thin film transistor is connected with the drain electrode of the driving transistor, and the source electrode of the sixth thin film transistor is connected with the anode of the light-emitting device; one end of the first capacitor is connected with the anode of the light-emitting device, and one end of the first capacitor is connected with the power supply output end or the initialization power supply output end.
In one embodiment, at least one of the thin film transistors is a P-type thin film transistor.
As a second aspect of the present invention, an embodiment of the present invention provides a display device, including a plurality of pixels and a plurality of pixel driving circuits as described above, wherein each of the pixel driving circuits drives each of the pixels to operate.
The pixel driving circuit provided by the embodiment of the invention comprises a voltage storage module, a light emitting device and a light emitting driving module, wherein in the stage of driving the light emitting module to drive the light emitting device to emit light, the voltage storage module shunts a driving current generated by driving the light emitting module, namely, the driving current charges the voltage storage module, when charging is started, the anode voltage of the light emitting device does not reach the starting voltage of the light emitting device, the light emitting device does not emit light, and when the voltage storage module is charged with certain electric quantity, the light emitting device emits light, therefore, compared with a circuit which does not have the voltage storage module and drives the light emitting module to directly drive the light emitting device, the driving circuit of the embodiment of the invention actually prolongs the non-light emitting time of the light emitting device, further reduces the average current of zero gray scale, thereby reducing the brightness of a display screen in a black picture, the contrast of the display screen is increased.
Drawings
Fig. 1 is a circuit diagram of a pixel driving circuit according to an embodiment of the invention;
fig. 2 is a circuit diagram of a pixel driving circuit according to another embodiment of the invention;
fig. 3 is a circuit diagram of a pixel driving circuit according to another embodiment of the invention;
fig. 4 is a circuit diagram of a pixel driving circuit according to another embodiment of the invention;
fig. 5 is a circuit diagram of a pixel driving circuit according to another embodiment of the invention;
fig. 6 is a timing control diagram of a pixel driving circuit according to an embodiment of the invention.
Detailed Description
As described in the background art, the contrast ratio of a display screen with high resolution and a large screen in the prior art is low, thereby affecting the display effect of the display screen, and the inventors have studied and found that the reason for this problem is that the resolution of the display screen is higher and higher, which leads to the reduction of the time for charging the pixels, thereby increasing the average current of the display screen during the light emitting process, and further reducing the contrast ratio of the display screen.
Therefore, the invention provides a pixel driving circuit which is applied to driving a display screen with high resolution and a large screen to emit light, and the average current of zero gray scale is reduced by prolonging the non-light emitting time of a light emitting device in the display screen (namely the time of displaying a black picture on the display screen), so that the brightness of the display screen is reduced when the display screen is in the black picture, and the contrast of the display screen is increased.
Specifically, the pixel driving circuit provided by the invention comprises: the driving light-emitting module, one end of the said driving light-emitting module receives the mains voltage; the light emitting device is electrically connected with the driving light emitting module and emits light under the driving of the driving light emitting module; and the voltage storage module is used for shunting the driving current generated when the driving light-emitting module drives the light-emitting device to emit light.
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.
Fig. 1 to 5 are circuit diagrams illustrating a pixel driving circuit according to an embodiment of the present invention. As shown in fig. 1 to 5, the pixel driving circuit provided in the embodiment of the present invention includes: the driving light-emitting module, one end of which receives power voltage; the light emitting device OLED is electrically connected with the driving light emitting module and emits light under the driving of the driving light emitting module; and the voltage storage module is used for shunting current generated when the light-emitting module is driven to drive the light-emitting device OLED to emit light. At the stage of driving the light emitting module to drive the light emitting device OLED to emit light, the voltage storage module shunts the driving current generated by driving the light emitting module, because each light emitting device OLED has a voltage across (i.e. a voltage difference between an anode voltage and a cathode voltage) required for turning on, so when the driving current generated by the driving transistor is shunted by the voltage storage module (i.e. the driving current charges the voltage storage module), the anode voltage of the light emitting device OLED has not yet reached the turn-on voltage of the light emitting device OLED (e.g. the OLED voltage across is less than 2V), so that the light emitting device OLED does not emit light, when the driving current charges the voltage storage module for a certain amount of electricity, i.e. the voltage at N1 of the voltage storage module is equal to the turn-on voltage of the light emitting device OLED (e.g. the voltage storage module is charged to 2V, i.e. the voltage at N1 of the voltage storage module is 2V), the anode voltage of the light emitting device OLED is equal to the voltage at N1 of the voltage storage module, the light emitting device starts to emit light just when the turn-on voltage of the light emitting device OLED is reached. Therefore, compared with a circuit which does not have a voltage storage module and drives a light emitting module to directly drive a light emitting device, the driving circuit of the embodiment of the invention actually prolongs the non-light emitting time of the light emitting device, and further reduces the average current of zero gray scale, so that the brightness of a display screen is reduced when the display screen is in a black picture, and the contrast of the display screen is increased.
It should be understood that the light emitting device refers to a device capable of emitting visible light outwards, and may be an organic light emitting diode (abbreviated as OLED) as described above, or may also be a light emitting diode (abbreviated as LED), and the embodiment of the present invention does not limit the specific kind of the light emitting device.
As for the shunting manner of the voltage storage module for shunting the driving current generated when the light emitting module drives the light emitting device to emit light, as shown in fig. 1, that is, one end of the voltage storage module is electrically connected to the output end of the power voltage Vdd, and the other end is electrically connected to the anode of the light emitting device OLED, as shown in fig. 1, the pixel driving circuit includes: the device comprises a driving light-emitting module, a light-emitting device OLED, a data storage module and a data storage control module. The driving light-emitting module is respectively and electrically connected with the power supply voltage output end, the data storage module and the light-emitting device, the data storage module is respectively and electrically connected with the data storage control module, the data signal line and the driving light-emitting module, and the data storage control module is electrically connected with the data storage module and receives a second scanning signal Scan 2; the data storage control module controls whether the data signal voltage Vdata from the data signal line is transmitted to the data storage module under the action of the second scanning signal; one end of the voltage storage module is connected with the output end of the power voltage Vdd, and the other end of the voltage storage module is connected with the anode of the light-emitting device OLED. The driving light emitting module receives a power voltage Vdd and a data signal voltage Vdata, converts a voltage difference between the power voltage Vdd and the data signal voltage Vdata into a driving current, and transmits the driving current to the light emitting device OLED and the voltage storage module, respectively. In the pixel driving circuit provided in the embodiment of the invention, when the driving light emitting module converts the voltage difference between the power voltage Vdd and the data signal voltage Vdata into the driving current, the driving current is shunted by the voltage storage module, and when the voltage storage module shunts the driving current generated by the driving transistor, and the anode voltage of the light emitting device OLED does not reach the turn-on voltage of the light emitting device OLED, the light emitting device OLED does not emit light, and when the driving current charges the voltage storage module for a certain amount of electricity, that is, the voltage at the N1 end of the voltage storage module is equal to the turn-on voltage of the light emitting device OLED (for example, the voltage storage module is charged to 2V, that is, the voltage at the N1 end of the voltage storage module is 2V), the light emitting device starts to emit light. Therefore, compared with a circuit which does not have a voltage storage module and drives a light emitting module to directly drive a light emitting device, the driving circuit of the embodiment of the invention actually prolongs the non-light emitting time of the light emitting device, and further reduces the average current of zero gray scale, so that the brightness of a display screen is reduced when the display screen is in a black picture, and the contrast of the display screen is increased.
In a preferred embodiment of the invention, the data storage module comprises at least one second capacitor C2.
In a preferred embodiment of the present invention, the light emitting driving module includes at least one driving transistor, and in a more preferred embodiment, the light emitting driving module includes one driving transistor M7, as shown in fig. 4 and 5.
In an embodiment, the voltage storage module includes a first capacitor C1, as shown in fig. 4 and 5, when the light emitting module is driven to generate a driving current and the light emitting device OLED is driven to emit light, the driving current is also transmitted to the first capacitor C1, and when the first capacitor C1 is charged with a certain amount, i.e., the voltage at the N1 terminal of the first capacitor C1 is equal to the turn-on voltage of the light emitting device OLED, since the anode voltage of the light emitting device OLED is equal to the voltage at the N1 terminal of the first capacitor C1, the light emitting device starts to emit light.
In a preferred embodiment of the present invention, the data storage control module includes at least one thin film transistor, in a more preferred embodiment, the data storage control module includes a first thin film transistor M1 and a second thin film transistor M2, as shown in fig. 4 and 5, the gate of the first thin film transistor M1 and the gate of the second thin film transistor M2 both receive the second Scan signal Scan2, the source of the first thin film transistor M1 is electrically connected to the data signal line, the drain of the first thin film transistor M1 is connected to the source of the second thin film transistor M2 and to one end of the second capacitor C2, the drain of the second thin film transistor M2 is connected to one end of the driving light emitting module, and the first thin film transistor M1 and the second thin film transistor M2 are used to transmit the data signal voltage Vdata from the data signal line to one end of the second capacitor C2 under the control of the second Scan signal Scan 2.
In another embodiment of the present invention, the pixel driving circuit further includes an initialization module, wherein the initialization module is electrically connected to the first Scan signal control line, the initialization voltage Vref output terminal, and the light emitting device OLED, respectively, and the initialization module controls whether the initialization voltage Vref is transmitted to the anode of the light emitting device OLED under the action of the first Scan signal Scan1 from the first Scan signal control line to reset, i.e., initialize, the anode voltage of the light emitting device OLED. In the pixel driving circuit, the shunting mode of the current generated when the voltage storage module shunts and drives the light emitting module to drive the light emitting device to emit light can be realized by the following modes: the voltage storage module is electrically connected to the initialization voltage Vref output terminal and the anode of the light emitting device OLED, respectively, as shown in fig. 2.
In a further embodiment, the initialization module is further connected to the data storage module for initializing the data storage module, as shown in fig. 5, the initialization module includes a third thin film transistor M3 and a fourth thin film transistor M4, wherein a gate of the third thin film transistor M3 and a gate of the fourth thin film transistor M4 both receive the first Scan signal Scan1, a source of the third thin film transistor M3 is connected to the data storage module, a drain of the third thin film transistor M3 is connected to a source of the fourth thin film transistor M4, a drain of the fourth thin film transistor M4 is connected to an anode of the light emitting device OLED, and a drain of the third thin film transistor M3 and a source of the fourth thin film transistor M4 are both connected to the output terminal of the initialization voltage Vref for receiving the initialization voltage Vref. When the third thin film transistor M3 and the fourth thin film transistor M4 are turned on by the first Scan signal Scan1, the turn-on of the third thin film transistor M3 causes the initialization voltage Vref to be transmitted to one end of the data storage module, so as to reset the voltage of the data storage module, that is, initialize the data storage module; the turn-on of the fourth thin film transistor M4 causes the initialization voltage Vref to be transmitted to the anode of the light emitting device OLED to effect the reset of the anode voltage of the light emitting device OLED, i.e., the initialization of the anode of the light emitting device OLED.
It should be understood that, the voltage storage module shunts the current generated when the light emitting module drives the light emitting device to emit light, and the connection manner of the voltage storage module and the other modules in the pixel driving circuit may be as described above, but this is not limited in the embodiment of the present invention, and the shunting of the current generated when the light emitting module drives the light emitting device can be achieved as long as one end of the voltage storage module is connected to the anode of the light emitting device and the other end is connected to the output end capable of providing voltage, and therefore, the connection manner of the voltage storage module and the other modules in the pixel driving circuit is not limited in the embodiment of the present invention.
In one embodiment, the pixel driving circuit further includes: the light-emitting device comprises a light-emitting device and a light-emitting control module which is connected between a power output end and an anode of the light-emitting device in series, wherein the anode of the light-emitting device is connected with a light-emitting driving module. As shown in fig. 3, the light-emitting control module receives the light-emitting control signal EM, and controls whether the power output terminal is connected to the anode of the light-emitting device according to the light-emitting control signal EM.
In one embodiment, the light emitting control module includes at least one thin film transistor. In a preferred embodiment, the light emitting control module includes a fifth thin film transistor M5 and a sixth thin film transistor M6, as shown in fig. 4 and 5, a gate of the fifth thin film transistor M5 and a gate of the sixth thin film transistor M6 both receive the light emitting control signal EM, and the fifth thin film transistor M5 and the sixth thin film transistor M6 are turned on or off under the control of the light emitting control signal EM; the drain of the fifth thin film transistor M5 is connected to the data storage module, and the source of the fifth thin film transistor M5 is connected to the source of the driving transistor M7; a source of the sixth thin film transistor M6 is connected to the anode of the light emitting device OLED, and a drain of the sixth thin film transistor M6 is connected to the drain of the driving transistor M7. When the fifth thin film transistor M5 and the sixth thin film transistor M6 are turned on, the turning on of the fifth thin film transistor M5 enables the power voltage Vdd to be supplied to the source of the driving transistor M7 so that a voltage difference Vdata-Vdd is formed between the gate and the source of the driving transistor M7. The turn-on of the sixth thin film transistor M6 enables the drain of the driving transistor M7 to be connected to the anode of the light emitting device, so that the current formed by the driving transistor M7 can be transmitted to the light emitting device OLED, and the light emitting device emits light.
It should be understood that the shunting manner of the driving current generated when the voltage storage module shunts and drives the light emitting module to drive the light emitting device to emit light may be selected according to a specific circuit structure, for example, as described above, one end of the voltage storage module is connected to the anode of the light emitting device OLED, and the other end of the voltage storage module is connected to the power supply voltage output terminal or the initialization voltage output terminal, and may also be connected to the first scan signal output terminal, the second scan signal output terminal, and the light emission control signal output terminal.
However, since the first scan signal, the second scan signal, and the light emission control signal are ac signals, a mura risk occurs when the light emitting device emits light at a low gray level. Therefore, one end of the voltage storage module is connected with the anode of the light-emitting device, and the other end of the voltage storage module is connected with the power supply voltage output end (outputting direct current signals) or the initialization voltage output end (outputting direct current signals), so that when the light-emitting device emits light, errors can not be generated, and the mura risk in low gray scale can not be reduced.
In order to better understand the pixel driving circuit, the operation of the pixel driving circuit will be described in detail with reference to a more specific embodiment.
Fig. 4 is a circuit diagram of a pixel driving circuit according to an embodiment of the present invention, fig. 6 is a timing diagram of driving signals of the pixel driving circuit according to the embodiment of the present invention, and as shown in fig. 4, the pixel driving circuit includes: the device comprises a data storage module, a data storage control module, an initialization module, a light emitting control module, a light emitting driving module, a voltage storage module and a light emitting device OLED; the light emitting driving module comprises a driving transistor M7, the data storage module comprises a second capacitor C2, the voltage storage module comprises a first capacitor C1, the data storage control module comprises a first thin film transistor M1 and a second thin film transistor M2, the initialization module comprises a third thin film transistor M3 and a fourth thin film transistor M4, and the light emitting control module comprises a fifth thin film transistor M5 and a sixth thin film transistor M6; wherein the gate of the first thin film transistor M1 and the gate of the second thin film transistor M2 are connected to a second Scan signal line for providing a Scan signal Scan2, the source of the first thin film transistor M1 is connected to a data signal voltage Vdata output terminal, the drain of the first thin film transistor M1 is connected to the source of the driving transistor M7, the source of the second thin film transistor M2 is connected to one end of the second capacitor C2 and the gate of the driving transistor M7, respectively, the drain of the second thin film transistor M2 is connected to the drain of the driving transistor M7, the other end of the second capacitor C2 is connected to a power supply voltage Vdd output terminal, the gate of the fifth thin film transistor M5 and the gate of the sixth thin film transistor M6 are connected to a light emission control signal line for providing a light emission control signal EM, the drain of the fifth thin film transistor M5 is connected to a power supply voltage output terminal, the source of the fifth thin film transistor M5 is connected to the source of the driving transistor M7, a drain of the sixth thin film transistor M6 is connected to a drain of the driving transistor M7, a source of the sixth driving transistor M6 is connected to an anode of the light emitting device OLED, a gate of the third thin film transistor M3 and a gate of the fourth thin film transistor M4 are both connected to a first Scan signal line for supplying a first Scan signal Scan1, a source of the third thin film transistor M3 is connected to one end of the second capacitor C2, a drain of the third thin film transistor M3 is connected to a source of the fourth thin film transistor M4, a drain of the fourth thin film transistor M4 is connected to the anode of the light emitting device OLED, one end of the first capacitor C1 is connected to the power supply voltage Vdd output terminal, and the other end of the first capacitor C1 is connected to the anode of the light emitting device OLED.
As shown in fig. 6, the operation of the pixel driving circuit shown in fig. 4 is as follows:
(1) initialization phase T1:
applying a first Scan signal Scan1 having a first voltage amplitude to the gate of the third thin film transistor M3 and the gate of the fourth thin film transistor M4, the first Scan signal Scan1 having the first voltage amplitude causing the third thin film transistor M3 and the fourth thin film transistor M4 to be turned on; applying a second Scan signal Scan2 having a second voltage amplitude to the gate of the first thin film transistor M1 and the gate of the second thin film transistor M2, the second Scan signal Scan2 having the second voltage amplitude turning off the first thin film transistor M1 and the second thin film transistor M2; the light emission control signal EM having the second voltage amplitude is applied to the gate of the fifth thin film transistor M5 and the gate of the sixth thin film transistor M6, and turns off the fifth thin film transistor M5 and the sixth thin film transistor M6.
As the fourth thin film transistor M4 is switched on, the anode voltage of the light emitting device OLED is Vref, the anode potential of the light emitting device is initialized, and the OLED is ensured to be inverted to form a black state; the third thin film transistor M3 is turned on to make the voltage at the Q1 terminal of the second capacitor C2 be Vref, and the voltage stored at the Q1 terminal of the second capacitor C2 is cleared; the gate voltage of the driving transistor M7 is Vref.
(2) Data write phase T2:
applying a second Scan signal Scan2 having a first voltage amplitude to the gate of the first thin film transistor M1 and the gate of the second thin film transistor M2, the second Scan signal Scan2 having the first voltage amplitude making the first thin film transistor M1 and the second thin film transistor M2 conductive; applying a first Scan signal Scan1 having a second voltage amplitude to the gate of the third thin film transistor M3 and the gate of the fourth thin film transistor M4, the first Scan signal Scan1 having the second voltage amplitude turning off the third thin film transistor M3 and the fourth thin film transistor M4; the light emission control signal EM having the second voltage amplitude is applied to the gate of the fifth thin film transistor M5 and the gate of the sixth thin film transistor M6, and turns off the fifth thin film transistor M5 and the sixth thin film transistor M6.
The voltage of the connection point 1 in the pixel circuit is equal to Vdata due to the conduction of the first thin film transistor M1; since the gate voltage of the driving transistor M7 is the first voltage amplitude, i.e. the driving transistor M7 is also turned on, the voltage at the connection point 3 in the pixel circuit is also equal to Vdata; since the second thin film transistor M2 is turned on and the voltage at the node 3 in the pixel circuit is equal to Vdata, the voltage at the Q1 terminal of the second capacitor C2 is also equal to Vdata.
(3) Display device light emission period T3:
applying the emission control signal EM having the first voltage amplitude to the gate of the fifth thin film transistor M5 and the gate of the sixth thin film transistor M6, the emission control signal EM having the first voltage amplitude turning on the fifth thin film transistor M5 and the sixth thin film transistor M6; applying a second Scan signal Scan2 having a second voltage amplitude to the gate of the first thin film transistor M1 and the gate of the second thin film transistor M2, the second Scan signal Scan2 having the second voltage amplitude turning off the first thin film transistor M1 and the second thin film transistor M2; applying a first Scan signal Scan1 having a second voltage amplitude to the gate of the third thin film transistor M3 and the gate of the fourth thin film transistor M4, the first Scan signal Scan1 having the second voltage amplitude turning off the third thin film transistor M3 and the fourth thin film transistor M4;
due to the conduction of the fifth thin film transistor M5, the source voltage of the driving transistor M7 is equal to the power supply voltage Vdd, and the difference between the gate voltage and the source voltage of the driving transistor M7 is equal to Vdd-vdata, so as to generate a driving current; due to the conduction of the sixth thin film transistor M6, the current generated by the driving transistor M7 can be transmitted to the first capacitor C1 and the anode of the light emitting device OLED.
When the sixth thin film transistor M6 is turned on, the driving current generated by the driving transistor M7 is transmitted to the first capacitor C1 and the anode of the OLED, and when the anode voltage of the OLED has not reached the turn-on voltage of the OLED, the OLED does not emit light, and when the driving current charges the first capacitor C1 for a certain amount of electricity, that is, the voltage at the N1 end of the first capacitor C1 is equal to the turn-on voltage of the OLED, the anode voltage of the OLED just reaches the turn-on voltage of the OLED, and the OLED starts to emit light. Therefore, compared with a circuit without the first capacitor C1, in which the driving transistor directly drives the light emitting device, the driving circuit of the embodiment of the invention actually prolongs the non-light emitting time of the light emitting device, and further reduces the average current of zero gray scale, so that the brightness of the display screen is reduced in the case of a black screen, and the contrast of the display screen is increased.
It should be understood that the second capacitor C1 may also be disposed between the anode of the light emitting device OLED and the initialization voltage output terminal, i.e., both ends of the first capacitor C1 are connected to the anode of the light emitting device OLED and the initialization voltage output terminal, respectively, as shown in fig. 5.
It should be understood that the thin film transistors provided in the above embodiments of the present invention, for example, the driving transistor M7, the first thin film transistor M1, the second thin film transistor M2, the third thin film transistor M3, the fourth thin film transistor M4, the fifth thin film transistor M5, and the sixth thin film transistor M6 are PMOS transistors, and the first voltage amplitude is a low-level voltage value and the second voltage amplitude is a high-level voltage value. Similarly, those skilled in the art may also divide the transistors in the pixel circuit into PMOS transistors and NMOS transistors, and the amplitude of the voltage applied to the corresponding transistor changes with the type of the crystal light, for example, in the same pixel circuit, if the first thin film transistor M1 and the second thin film transistor M2 are both PMOS transistors, the first voltage amplitude of the second Scan signal Scan2 applied to the gate of the first thin film transistor M1 and the gate of the second thin film transistor M2 is a low-level voltage value; if the third thin film transistor M3 and the fourth thin film transistor M4 are both NMOS transistors, the first voltage amplitude of the first Scan signal Scan1 applied to the gate of the third thin film transistor M3 and the gate of the fourth thin film transistor M4 is a high level voltage value. Therefore, the present invention does not limit the kinds of transistors in the pixel driving circuit and the amplitudes of the signal voltages applied to the corresponding transistors.
An embodiment of the present invention further provides a display device, including the pixel driving circuit as described above.
The embodiment of the present invention further provides a display device, which includes a plurality of pixels and a plurality of pixel driving circuits, each pixel driving circuit correspondingly drives one pixel to operate, wherein the structure of the pixel driving circuit is as described above. According to the display device provided by the embodiment of the invention, the voltage storage module which is used for being shunted with the light-emitting device is arranged in the pixel driving circuit, when the driving module in the driving circuit generates the driving current, the driving current charges the voltage storage module, namely, the driving current charges the voltage storage module, when the charging is started, the anode voltage of the light-emitting device does not reach the starting voltage of the light-emitting device, the light-emitting device does not emit light, and when the voltage storage module is charged with certain electric quantity, the light-emitting device emits light.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (4)
1. A pixel driving circuit, comprising:
the driving light-emitting module, one end of the said driving light-emitting module receives the mains voltage;
the light emitting device is electrically connected with the driving light emitting module and emits light under the driving of the driving light emitting module;
the voltage storage module is used for shunting driving current generated when the driving light-emitting module drives the light-emitting device to emit light; and
the initialization module receives a first scanning signal and controls whether the anode of the light-emitting device is connected with the output end of an initialization power supply or not according to the first scanning signal;
the data storage module is used for storing data signal voltage;
the data storage control module is used for receiving a second scanning signal and controlling whether the voltage of the data signal is stored in the data storage module or not according to the second scanning signal;
wherein the voltage storage module includes a first capacitor, one end of the first capacitor is connected to an anode of the light emitting device, the other end of the first capacitor is electrically connected to an output terminal of the initialization power supply, the first capacitor is configured such that the light emitting device is turned on when charged to a voltage of 2V at the end of the first capacitor connected to the anode, an
The pixel driving circuit further comprises a data storage module, a data storage control module and a light emitting control module, wherein,
the driving light-emitting module comprises a driving transistor, and the source electrode of the driving transistor is connected with the output end of the power supply;
the data storage module comprises a second capacitor, one end of the second capacitor is connected with the output end of the power supply, and the other end of the second capacitor is connected with the grid electrode of the driving transistor;
the data storage control module comprises a first thin film transistor and a second thin film transistor, wherein the grid electrode of the first thin film transistor and the grid electrode of the second thin film transistor receive the second scanning signal, the source electrode of the first thin film transistor receives data signal voltage, and the drain electrode of the first thin film transistor is connected with the source electrode of the driving transistor;
the initialization module comprises a third thin film transistor and a fourth thin film transistor, wherein a gate of the third thin film transistor and a gate of the fourth thin film transistor both receive the first scanning signal, a source of the third thin film transistor is connected with one end of the second capacitor, a drain of the third thin film transistor receives an initialization voltage, a source of the fourth thin film transistor receives the initialization voltage, and a drain of the fourth thin film transistor is connected with an anode of the light emitting device;
the light-emitting control module comprises a fifth thin film transistor and a sixth thin film transistor, wherein the grid electrode of the fifth thin film transistor and the grid electrode of the sixth thin film transistor both receive light-emitting control signals, the source electrode of the fifth thin film transistor receives power supply voltage, the drain electrode of the fifth thin film transistor is connected with the source electrode of the driving transistor, the drain electrode of the sixth thin film transistor is connected with the drain electrode of the driving transistor, and the source electrode of the sixth thin film transistor is connected with the anode of the light-emitting device.
2. The pixel driving circuit according to claim 1, wherein the data storage control module comprises at least one thin film transistor.
3. The pixel driving circuit according to claim 1, further comprising:
the light-emitting control module is connected between the power output end and the anode of the light-emitting device in series, receives a light-emitting control signal, and controls whether the power output end is connected with the anode of the light-emitting device or not according to the light-emitting control signal.
4. A display device, comprising:
a plurality of pixels; and the number of the first and second groups,
a plurality of pixel drive circuits according to any one of claims 1 to 3, wherein each of said pixel drive circuits drives each of said pixels into operation.
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| CN110136643B (en) * | 2019-06-12 | 2021-01-08 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof, display substrate and display device |
| CN110264956A (en) * | 2019-06-21 | 2019-09-20 | 京东方科技集团股份有限公司 | Pixel circuit and its control method, display device |
| CN111179840B (en) * | 2020-02-26 | 2022-06-03 | 昆山国显光电有限公司 | Pixel driving circuit and display device |
| CN111243514B (en) * | 2020-03-18 | 2023-07-28 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof and display panel |
| US11501707B2 (en) | 2020-03-31 | 2022-11-15 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Pixel circuit and driving method thereof, display device and driving method thereof |
| CN111462680B (en) * | 2020-04-22 | 2022-02-18 | 昆山国显光电有限公司 | Pixel circuit, driving method thereof, display panel and display device |
| CN113327543B (en) * | 2021-05-28 | 2023-06-20 | 京东方科技集团股份有限公司 | Display substrate, driving method thereof and display device |
| CN113393806B (en) * | 2021-06-30 | 2023-01-03 | 上海天马微电子有限公司 | Display panel and display device |
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