CN114038390A - Pixel circuit and display device - Google Patents
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- CN114038390A CN114038390A CN202110580262.XA CN202110580262A CN114038390A CN 114038390 A CN114038390 A CN 114038390A CN 202110580262 A CN202110580262 A CN 202110580262A CN 114038390 A CN114038390 A CN 114038390A
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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]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The present application relates to a pixel circuit, comprising: the driving circuit comprises a first light-emitting control sub-circuit, a first resetting sub-circuit, an energy storage element, a driving transistor, a control data writing sub-circuit, a second light-emitting control sub-circuit, a second resetting sub-circuit, a data writing sub-circuit and a light-emitting diode. The first light-emitting control sub-circuit writes a reference voltage into the energy storage element; the first reset sub-circuit writes a reference voltage into the energy storage element; the energy storage element is used for changing the voltage of the grid electrode of the driving transistor; the driving transistor is used for driving the light emitting diode to emit light; controlling the data writing sub-circuit to write the first power supply voltage into the energy storage element; the second light-emitting control sub-circuit transmits the driving current to the light-emitting diode; the second reset sub-circuit discharges the energy storage element through the initialization voltage signal; the data writing sub-circuit writes a data voltage into the energy storage element. The application also relates to a display device with the pixel circuit.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a pixel circuit and a display device having the same.
Background
Micro Light Emitting diodes (Micro LEDs) have the advantages of small size, power saving, wide color gamut, long service life, and the like, and with the maturity of manufacturing processes and the reduction of price, related products (such as Micro LED displays) of Micro LEDs are increasing in recent years. At present, problems of threshold voltage, power supply drift and the like of a Micro LED pixel driving circuit are often caused along with increase of service time of a Micro LED display, and therefore phenomena of unstable display, uneven brightness display and the like of a display screen of the Micro LED display are caused.
Therefore, it is an urgent need to solve the problems of uneven display brightness and unstable display of the display screen caused by the threshold voltage and power supply drift of the Micro LED pixel driving circuit.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present application aims to provide a pixel circuit and a display device having the same, which aims to solve the problems of unstable display and non-uniform brightness display caused by threshold voltage and power supply drift of Micro LED pixel driving circuits in the prior art.
A pixel circuit, comprising: the light-emitting diode comprises a first light-emitting control sub-circuit, a first resetting sub-circuit, an energy storage element, a driving transistor, a control data writing sub-circuit, a second light-emitting control sub-circuit, a second resetting sub-circuit, a data writing sub-circuit and a light-emitting diode, wherein: the first light-emitting control sub-circuit is electrically connected with a reference voltage end, the first reset sub-circuit, the energy storage element and the data writing sub-circuit and is used for responding to a light-emitting control signal and writing the reference voltage written by the reference voltage end into the energy storage element; the first reset sub-circuit is electrically connected with the reference voltage end, the energy storage element and the data writing sub-circuit, and is used for responding to a reset signal and writing the reference voltage into the energy storage element as the reference voltage of the energy storage element; the energy storage element is electrically connected with the grid electrode of the driving transistor, the control data writing sub-circuit, the second resetting sub-circuit and the data writing sub-circuit and is used for changing the grid electrode voltage of the driving transistor; the grid electrode of the driving transistor is electrically connected with the control data writing sub-circuit and the second resetting sub-circuit, the drain electrode of the driving transistor is electrically connected with a first power supply voltage end, and the source electrode of the driving transistor is electrically connected with the control data writing sub-circuit and the second light-emitting control sub-circuit and is used for driving the light-emitting diode to emit light; the control data writing sub-circuit is electrically connected with the second light-emitting control sub-circuit and used for responding to a control data writing signal and writing a first power supply voltage into the energy storage element; the second light-emitting control sub-circuit is electrically connected with the light-emitting diode and is used for responding to the light-emitting control signal and transmitting a driving current to the light-emitting diode so as to drive the light-emitting diode to emit light; the second reset sub-circuit is electrically connected with the energy storage element and the control data writing sub-circuit, and is used for responding to the reset signal and discharging the energy storage element through an initialization voltage signal; the data writing sub-circuit is electrically connected with the energy storage element and used for responding to the control data writing signal and writing data voltage into the energy storage element as reference voltage of the energy storage element; the anode of the light emitting diode is electrically connected with the second light emitting control sub-circuit, and the cathode of the light emitting diode is electrically connected with a second power supply voltage end.
In the pixel circuit, when the driving transistor drives the light emitting diode to emit light, the driving current is written into the light emitting diode, and the magnitude of the driving current is related to the data voltage and the reference voltage written into the energy storage element and is unrelated to the threshold voltage of the driving transistor, so that the influence of the threshold voltage on the driving current is eliminated, and the overall brightness uniformity of the display device is effectively improved.
Optionally, the first light-emitting control sub-circuit includes a first light-emitting control transistor, a gate of the first light-emitting control transistor receives the light-emitting control signal, a drain of the first light-emitting control transistor is electrically connected to the reference voltage terminal and receives a reference voltage written by the reference voltage terminal, and a source of the first light-emitting control transistor is electrically connected to the first reset sub-circuit, the energy storage element, and the data writing sub-circuit.
Optionally, the first reset sub-circuit includes a first reset transistor, a gate of the first reset transistor receives the reset signal, a drain of the first reset transistor is electrically connected to the reference voltage terminal and receives the reference voltage written by the reference voltage terminal, and a source of the first reset transistor is electrically connected to the source of the first light-emitting control transistor, the energy storage element, and the data writing sub-circuit.
Optionally, the energy storage element includes a storage capacitor, a first end of the storage capacitor is electrically connected to the source of the first light emitting control transistor, the source of the first reset transistor, and the data writing sub-circuit, and a second end of the storage capacitor is electrically connected to the gate of the driving transistor, the control data writing sub-circuit, and the second reset sub-circuit, and is configured to change a gate voltage of the driving transistor.
Optionally, the control data writing sub-circuit includes a data control transistor, a gate of the data control transistor receives the control data writing signal, a drain of the data control transistor is electrically connected to the second end of the energy storage element, the gate of the driving transistor and the second reset sub-circuit, and a source of the data control transistor is electrically connected to the source of the driving transistor and the second light emitting control sub-circuit.
Optionally, the second light-emitting control sub-circuit includes a second light-emitting control transistor, a gate of the second light-emitting control transistor receives the light-emitting control signal, a drain of the second light-emitting control transistor is electrically connected to the source of the driving transistor and the source of the data control transistor, and a source of the second light-emitting control transistor is electrically connected to the light-emitting diode.
Optionally, the second reset sub-circuit includes a second reset transistor, a gate of the second reset transistor receives the reset signal, a drain of the second reset transistor is electrically connected to a drain of the data control transistor, the second end of the energy storage element, and a gate of the driving transistor, and a source of the second reset transistor is electrically connected to an initialization voltage signal end, and writes the initialization voltage into the energy storage element.
Optionally, the data writing sub-circuit includes a switching transistor, a gate of the switching transistor receives the control data writing signal, a source of the switching transistor receives the data voltage, and a drain of the switching transistor is electrically connected to the source of the first light emitting control transistor, the source of the first reset transistor, and the first end of the energy storage element.
Optionally, the driving transistor is a P-type transistor.
In the pixel circuit, since the threshold voltage of the driving transistor has no influence on the light emitting current of the light emitting diode, the pixel circuit can compensate the influence on the display uniformity of the display due to unstable light emitting current caused by uneven threshold voltage of the driving transistor.
Based on the same inventive concept, the application also provides a display device which comprises the pixel circuit.
In the display device, when the driving transistor drives the light emitting diode to emit light, the driving current is written into the light emitting diode, and the magnitude of the driving current is related to the data voltage and the reference voltage written into the energy storage element and is unrelated to the threshold voltage of the driving transistor, so that the influence of the threshold voltage on the driving current is eliminated, and the overall brightness uniformity of the display device is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display panel disclosed in an embodiment of the present application;
FIG. 2 is a circuit diagram of the pixel circuit shown in FIG. 1;
FIG. 3 is a circuit diagram of the pixel circuit shown in FIG. 2;
fig. 4 is a timing diagram corresponding to the pixel circuit shown in fig. 3.
Description of reference numerals:
10-a display panel;
100-a non-display area;
200-a display area;
110-pixel circuits;
111-a first light emitting control sub-circuit;
112-a first reset sub-circuit;
113-an energy storage element;
114-a drive transistor;
115-control data write subcircuit;
116-a second emission control sub-circuit;
117-second reset sub-circuit;
118-a data write subcircuit;
119-a light emitting diode;
t1 — first light emission control transistor;
t2 — first reset transistor;
t3 — data control transistor;
cst — storage capacitance;
t4 — second emission control transistor;
t5 — second reset transistor;
t6-switching transistor;
119-a light emitting diode;
VDD-a first supply voltage terminal;
Vref-a reference voltage terminal;
Vss-a second supply voltage terminal.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
At present, problems of threshold voltage, power supply drift and the like of a Micro LED pixel driving circuit are often caused along with increase of service time of a Micro LED display, and therefore phenomena of unstable display, uneven brightness display and the like of a display screen of the Micro LED display are caused. Based on this, the present application intends to provide a solution to the problems of uneven display brightness and unstable display of the display screen caused by the threshold voltage and power source drift of the Micro LED pixel driving circuit, and the details of which will be described in the following embodiments.
The detailed description of the scheme of the application provides a specific circuit structure of a pixel circuit and a display device with the pixel circuit.
Please refer to fig. 1, which is a schematic structural diagram of a display panel according to an embodiment of the present disclosure. As shown in fig. 1, the present application provides a display panel 10, which includes a display area 100 and a non-display area 200. The display area 100 is used for displaying images, and the non-display area 200 is disposed around the display area 100 and is not used for displaying images. The display panel 10 further includes a pixel circuit 110, and the pixel circuit 110 is disposed in the display area 100 and is used for displaying an image. It is understood that in some embodiments, the display panel 10 may use a liquid crystal material as a display medium, but the application is not limited thereto.
It is understood that the display panel 100 can be used for electronic devices including functions such as a Personal Digital Assistant (PDA) and/or a music player, such as a mobile phone, a tablet computer, a wearable electronic device with wireless communication function (e.g., a smart watch, a smart band), and the like. The electronic device may also be other electronic devices such as a Laptop computer (Laptop) with a touch sensitive surface (e.g., a touch panel), etc. In some embodiments, the electronic device may have a communication function, that is, may establish communication with a network through a 2G (second generation mobile phone communication specification), a 3G (third generation mobile phone communication specification), a 4G (fourth generation mobile phone communication specification), a 5G (fifth generation mobile phone communication specification), or a W-LAN (wireless local area network) or a communication method that may appear in the future. For the sake of brevity, no further limitations are imposed on this embodiment of the present application.
Please refer to fig. 2, which is a circuit diagram of the pixel circuit shown in fig. 1. As shown in fig. 2, the pixel circuit 110 provided herein may include at least a first light-emitting control sub-circuit 111, a first reset sub-circuit 112, an energy storage element 113, a driving transistor 114, a control data writing sub-circuit 115, a second light-emitting control sub-circuit 116, a second reset sub-circuit 117, a data writing sub-circuit 118, and a light-emitting diode 119.
Wherein the first light-emitting control sub-circuit 111 and the reference voltage terminal VrefThe first reset sub-circuit 112, the energy storage element 113 and the data write sub-circuit 118 are electrically connected, and are configured to respond to the emission control signal Emit and to output the reference voltage terminal VrefThe written reference voltage is written to the energy storage element 113.
The first reset sub-circuit 112 and the reference voltage terminal VrefThe first light-emitting control sub-circuit 111, the energy storage element 113 and the data writing sub-circuit 118 are electrically connected, and are configured to respond to a Reset signal Reset and write the reference voltage into the energy storage element 113 as a reference voltage of the energy storage element 113.
The energy storage element 113 is electrically connected to the first light-emitting control sub-circuit 111, the first reset sub-circuit 112, the gate of the driving transistor 114, the control data writing sub-circuit 115, the second reset sub-circuit 117, and the data writing sub-circuit 118, and is configured to change a gate voltage of the driving transistor 114.
A gate of the driving transistor 114 is electrically connected to the energy storage element 113, the control data writing sub-circuit 115 and the second resetting sub-circuit 117, and a drain of the driving transistor 114 is electrically connected to a first power voltage terminal VDDAnd the source of the driving transistor 114 is electrically connected to the control data writing sub-circuit 115 and the second light-emitting control sub-circuit 116, and is configured to drive the light-emitting diode 119 to emit light. It is composed ofIn the first power voltage terminal VDDA first supply voltage is received.
The control data writing sub-circuit 115 is electrically connected to the energy storage element 113, the source and the Gate of the driving transistor 114, and the second light emitting control sub-circuit 116, and is configured to write the first power voltage into the energy storage element 113 in response to a control data writing signal Gate.
The second light-emitting control sub-circuit 116 is electrically connected to the source of the driving transistor 114, the control data writing sub-circuit 115, and the light-emitting diode 119, and is configured to transmit a driving current to the light-emitting diode 119 in response to the light-emitting control signal Emit, so as to drive the light-emitting diode 119 to Emit light.
The second Reset sub-circuit 117 is electrically connected to the energy storage element 113, the gate of the driving transistor 114 and the control data writing sub-circuit 115, and is configured to respond to the Reset signal Reset and generate an initialization voltage signal VintDischarging the energy storage element 113.
The data writing sub-circuit 118 is electrically connected to the first light-emitting control sub-circuit 111, the first reset sub-circuit 112 and the energy storage element 113, and is configured to respond to the control data writing signal Gate and write a data voltage VdataAnd writing the energy storage element 113 as a reference voltage of the energy storage element 113. That is, the reference voltage of the energy storage element 113 may include the reference voltage terminal VrefReference voltage and data voltage V for writingdata. It is to be understood that, for convenience of description, the reference voltage written by the first Reset sub-circuit 112 to the energy storage element 113 in response to the Reset signal Reset may be defined as a first reference voltage, and the reference voltage written by the data write sub-circuit 118 to the energy storage element 113 in response to the control data write signal Gate may be defined as a second reference voltage. It is to be understood that the above definitions are only for the purpose of better understanding and describing the embodiments of the present application and are therefore not to be construed as limiting the present application.
The anode of the light emitting diode 119 is electrically connected to the second light emitting control sub-circuit 116, and the cathode of the light emitting diode 119 is electrically connected to a second power voltage Vss.
Therefore, in the pixel circuit 110 of the present application, when the driving transistor 114 drives the light emitting diode 119 to emit light, the driving current is written into the light emitting diode 119, and the magnitude of the driving current and the reference voltage (i.e., the reference voltage terminal V) written into the energy storage element 113 are written into the light emitting diode 119refReference voltage and data voltage V for writingdata) The threshold voltage of the driving transistor 114 is irrelevant, so that the influence of the threshold voltage on the driving current is eliminated, the problems of uneven display brightness and unstable display caused by the threshold voltage and power supply drift of a pixel driving circuit are solved, and the overall brightness uniformity and stability of the display device are effectively improved.
Please refer to fig. 3, which is a circuit diagram of the pixel circuit shown in fig. 2. As shown in fig. 3, the first light-emitting control sub-circuit 111 in the pixel circuit 110 provided by the present application includes a first light-emitting control transistor T1, a gate of the first light-emitting control transistor T1 receives the light-emitting control signal Emit, a drain of the first light-emitting control transistor T1 and the reference voltage terminal VrefElectrically connected to and receiving the reference voltage terminal VrefThe source of the first light-emitting control transistor T1 is electrically connected to the first reset sub-circuit 112, the energy storage element 113 and the data write sub-circuit 118. When the emission control signal Emit is a low level signal, the first emission control transistor T1 is turned on in response to the emission control signal Emit, and the reference voltage is written in the energy storage element 113.
The first Reset sub-circuit 112 includes a first Reset transistor T2, a gate of the first Reset transistor T2 receiving the Reset signal Reset, a drain of the first Reset transistor T2 and the reference voltage terminal VrefElectrically connected to and receiving the reference voltage terminal VrefA written reference voltage, a source of the first reset transistor T2, a source of the first light emitting control transistor T1, the energy storage element 113 and the data writing sub-circuitThe vias 118 are electrically connected. When the Reset signal Reset is a low-level signal, the first Reset transistor T2 is turned on in response to the Reset signal Reset, and the reference voltage is written into the energy storage element 113 through the first Reset transistor T2 as the reference voltage of the energy storage element 113.
The energy storage element 113 includes a storage capacitor Cst, a first end of the storage capacitor Cst is electrically connected to the source of the first light emitting control transistor T1, the source of the first reset transistor T2, and the data writing sub-circuit 118, and a second end of the storage capacitor Cst is electrically connected to the gate of the driving transistor 114, the control data writing sub-circuit 115, and the second reset sub-circuit 117, for changing the gate voltage of the driving transistor 114.
A gate of the driving transistor 114 is electrically connected to the second terminal of the energy storage element 113, the control data writing sub-circuit 115, and the second resetting sub-circuit 117, and a drain of the driving transistor 114 is electrically connected to the first power voltage terminal VDDAnd the source of the driving transistor 114 is electrically connected to the control data writing sub-circuit 115 and the second light-emitting control sub-circuit 116, and is configured to drive the light-emitting diode 119 to emit light. Wherein the first power voltage terminal VDDA first supply voltage is received.
The control data writing sub-circuit 115 includes a data control transistor T3, the Gate of the data control transistor T3 receives the control data writing signal Gate, the drain of the data control transistor T3 is electrically connected to the second terminal of the energy storage element 113, the Gate of the driving transistor 114 and the second reset sub-circuit 117, and the source of the data control transistor T3 is electrically connected to the source of the driving transistor 114 and the second light emitting control sub-circuit 116. When the control data write signal Gate is a low level signal, the data control transistor T3 is turned on in response to the control data write signal Gate, and the first power voltage is written into the energy storage element 113 through the first data control transistor T3.
The second light-emitting control sub-circuit 116 includes a second light-emitting control transistor T4, a gate of the second light-emitting control transistor T4 receives the light-emitting control signal Emit, a drain of the second light-emitting control transistor T4 is electrically connected to the source of the driving transistor 114 and the source of the data control transistor T3, and a source of the second light-emitting control transistor T4 is electrically connected to the light-emitting diode 119. When the emission control signal Emit is a low level signal, the second emission control transistor T4 is turned on in response to the emission control signal Emit, and the second emission control transistor T4 transmits the driving current to the light emitting diode 119 to drive the light emitting diode 119 to Emit light.
The second Reset sub-circuit 117 includes a second Reset transistor T5, a gate of the second Reset transistor T5 receives the Reset signal Reset, a drain of the second Reset transistor T5 is electrically connected to the drain of the data control transistor T3, the second terminal of the energy storage element 113 and the gate of the driving transistor 114, a source of the second Reset transistor T5 and an initialization voltage signal terminal VintElectrically connected and writes the initialization voltage into the energy storage element 113. When the Reset signal Reset is a low level signal, the second Reset transistor T5 is turned on in response to the Reset signal Reset and passes through an initialization voltage signal VintDischarging the energy storage element 113.
The data write sub-circuit 118 includes a switching transistor T6, a Gate of the switching transistor T6 receives the control data write signal Gate, and a source of the switching transistor T6 receives the data voltage VdataThe drain of the switch transistor T6 is electrically connected to the source of the first light-emitting control transistor T1, the source of the first reset transistor T2 and the first end of the energy storage element 113. When the control data write signal Gate is a low level signal, the switching transistor T6 is turned on in response to the control data write signal Gate, and the data voltage V is applied through the switching transistor T6dataAnd writing the reference voltage into the energy storage element 113 as a reference voltage of the energy storage element 113. That is, the reference voltage of the energy storage element 113 may includeThe reference voltage terminal VrefReference voltage and data voltage V for writingdata。
The transistors shown in the embodiment of fig. 3 are all P-type transistors, and it is conceivable that the implementation using N-type transistors is easily conceivable by those skilled in the art without inventive labor, and therefore, is within the scope of the embodiments of the present application. It should be noted that the transistors used in the embodiments of the present application may be thin film transistors or field effect transistors or other devices with the same characteristics, and since the source and the drain of the transistors used are symmetrical, there is no difference between the source and the drain.
A timing chart corresponding to the pixel circuit 110 shown in fig. 3 is shown in fig. 4, and specifically, three stages of t1, t2, and t3 in the timing chart shown in fig. 4 are selected. Details of the timing diagram of the pixel circuit 110 shown in fig. 4 will be described in the following embodiments.
Specifically, 1 represents a high potential, and 0 represents a low potential. It should be noted that 1 and 0 are logic potentials only for better explaining the specific operation of the embodiment of the present application, and are not potentials applied to the gates of the transistors during the specific implementation process. In this embodiment, since all the transistors are P-type transistors, the active signal is a low level signal.
In a period t1 (i.e., a Reset period), the Reset signal Reset is 0, the control data write signal Gate is 1, and the emission control signal Emit is 1.
Specifically, when the Reset signal Reset is a low level signal, the control data write signal Gate is a high level signal, and the Reset signal Reset is a low level signal, the first Reset transistor T2 and the second Reset transistor T5 are both turned on, and the first light emission control transistor T1, the data control transistor T3, the second light emission control transistor T4, and the switch transistor T6 are all turned off. Accordingly, the first reset transistor T2 is turned on, and the reference voltage terminal V is connected through the first reset transistor T2refThe written reference voltage is transmitted to the first terminal of the storage capacitor Cst; the secondThe reset transistor T5 is turned on to apply the initialization voltage signal VintTo the second terminal of the storage capacitor Cst; the reference voltage signal and the initialization voltage signal VintAnd are respectively transmitted to the first terminal and the second terminal of the storage capacitor Cst, thereby clearing the display state of the previous frame and providing an initial on state.
In the period t2 (i.e., the data writing and threshold value compensation periods), the Reset signal Reset is 1, the control data writing signal Gate is 0, and the emission control signal Emit is 1.
Specifically, when the control data write signal Gate is a low level signal and the Reset signal Reset and the emission control signal Emit are high level signals, the data control transistor T3 and the switching transistor T6 are all turned on, and the first emission control transistor T1, the first Reset transistor T2, the second emission control transistor T4 and the second Reset transistor T5 are all turned off. Accordingly, the data control transistor T3 and the switching transistor T6 are turned on, and the data voltage VdataThe first terminal of the storage capacitor Cst is written through the switching transistor T6, and the voltage of the first terminal of the storage capacitor Cst is at most Vdata(ii) a The data control transistor T3 is turned on to transmit the first power voltage to the second terminal of the storage capacitor Cst via the data control transistor T3 and the driving transistor 114, and the second terminal of the storage capacitor Cst has a voltage up to Vdata+Vth(ii) a Wherein, VthIn order to complete the threshold voltage compensation of the driving transistor 114 to the gate of the driving transistor 114, the gate of the driving transistor 114 is turned off after the natural discharge is completed, and then the voltage difference between the gate and the source of the driving transistor 114 is the threshold voltage of the driving transistor 114, thereby completing the threshold compensation state.
In a period t3 (i.e., a light-emitting period), the Reset signal Reset is 1, the control data write signal Gate is 1, and the light-emitting control signal Emit is 0.
Specifically, when the emission control signal Emit is a low level signal, the Reset signal Reset is a high level signal, and the control data write signal Gate is a high level signalWhen the signal is flat, the first and second light-emitting control transistors T1 and T4 are all turned on, and the first reset transistor T2, the data control transistor T3, the second reset transistor T5, and the switching transistor T6 are all turned off. The voltage at the first terminal of the storage capacitor Cst is redistributed, and the voltage at the first terminal of the storage capacitor Cst is the reference voltage VrefThe voltage at the second terminal of the storage capacitor Cst is VDD+Vth-(Vdata-Vref) The voltage difference between the gate and the source of the driving transistor 114 is the voltage of the second terminal of the storage capacitor Cst minus VDDAccording to the formula
It is known that the current is driven
Wherein
Thus, the driving current and the threshold voltage V of the driving transistor 114thIrrespective of VthHas no influence on the driving current of the light emitting diode 119, and the current is in a stable light emitting state until the next data voltage VdataWriting changes its light emitting state.
In summary, in the pixel circuit 110, the threshold voltage V of the driving transistor 114 is setthThe influence of the threshold voltage on the driving current can be eliminated without affecting the driving current of the light emitting diode 119, and the pixel circuit 110 can compensate the threshold voltage V of the driving transistor 114thUneven and then cause drive current unstable to the influence that the demonstration homogeneity of display caused has solved because pixel drive circuit takes place threshold voltage and power drift and leads to showing luminance uneven and show unstable problem, and then effectual promotion display device's whole luminance homogeneity and stability.
The embodiment of the present application further provides a display device, which includes the display panel 10 shown in fig. 1 and the pixel circuits of the display area 100 disposed in the display panel 10 shown in fig. 2 to 3. The display device may be a liquid crystal display device or an electroluminescent display device, for example, any electronic device or component having a display function, such as an OLED panel, a Micro LED panel, a Mini LED panel, a mobile phone, a tablet computer, a navigator, a display, and the like, which is not particularly limited in this application.
It should be understood that the application of the present application is not limited to the above examples, and that modifications or changes may be made by those skilled in the art based on the above description, and all such modifications and changes are intended to fall within the scope of the appended claims.
Claims (10)
1. A pixel circuit, comprising: the light-emitting diode comprises a first light-emitting control sub-circuit, a first resetting sub-circuit, an energy storage element, a driving transistor, a control data writing sub-circuit, a second light-emitting control sub-circuit, a second resetting sub-circuit, a data writing sub-circuit and a light-emitting diode, wherein:
the first light-emitting control sub-circuit is electrically connected with a reference voltage end, the first reset sub-circuit, the energy storage element and the data writing sub-circuit and is used for responding to a light-emitting control signal and writing the reference voltage written by the reference voltage end into the energy storage element;
the first reset sub-circuit is electrically connected with the reference voltage end, the energy storage element and the data writing sub-circuit, and is used for responding to a reset signal and writing the reference voltage into the energy storage element as the reference voltage of the energy storage element;
the energy storage element is electrically connected with the grid electrode of the driving transistor, the control data writing sub-circuit, the second resetting sub-circuit and the data writing sub-circuit and is used for changing the grid electrode voltage of the driving transistor;
the grid electrode of the driving transistor is electrically connected with the control data writing sub-circuit and the second resetting sub-circuit, the drain electrode of the driving transistor is electrically connected with a first power supply voltage end, and the source electrode of the driving transistor is electrically connected with the control data writing sub-circuit and the second light-emitting control sub-circuit and is used for driving the light-emitting diode to emit light;
the control data writing sub-circuit is electrically connected with the second light-emitting control sub-circuit and used for responding to a control data writing signal and writing a first power supply voltage into the energy storage element;
the second light-emitting control sub-circuit is electrically connected with the light-emitting diode and is used for responding to the light-emitting control signal and transmitting a driving current to the light-emitting diode so as to drive the light-emitting diode to emit light;
the second reset sub-circuit is electrically connected with the energy storage element and the control data writing sub-circuit, and is used for responding to the reset signal and discharging the energy storage element through an initialization voltage signal;
the data writing sub-circuit is electrically connected with the energy storage element and used for responding to the control data writing signal and writing data voltage into the energy storage element as reference voltage of the energy storage element;
the anode of the light emitting diode is electrically connected with the second light emitting control sub-circuit, and the cathode of the light emitting diode is electrically connected with a second power supply voltage end.
2. The pixel circuit according to claim 1, wherein the first light emission control sub-circuit comprises a first light emission control transistor, wherein: the grid electrode of the first light-emitting control transistor receives the light-emitting control signal, the drain electrode of the first light-emitting control transistor is electrically connected with the reference voltage end and receives the reference voltage written by the reference voltage end, and the source electrode of the first light-emitting control transistor is electrically connected with the first reset sub-circuit, the energy storage element and the data writing sub-circuit.
3. The pixel circuit according to claim 2, wherein the first reset sub-circuit comprises a first reset transistor, wherein: the grid electrode of the first reset transistor receives the reset signal, the drain electrode of the first reset transistor is electrically connected with the reference voltage end and receives the reference voltage written by the reference voltage end, and the source electrode of the first reset transistor is electrically connected with the source electrode of the first light-emitting control transistor, the energy storage element and the data writing sub-circuit.
4. The pixel circuit of claim 3, wherein the energy storage element comprises a storage capacitor, wherein: the first end of the storage capacitor is electrically connected with the source electrode of the first light-emitting control transistor, the source electrode of the first reset transistor and the data writing sub-circuit, and the second end of the storage capacitor is electrically connected with the grid electrode of the driving transistor, the control data writing sub-circuit and the second reset sub-circuit and used for changing the grid electrode voltage of the driving transistor.
5. The pixel circuit according to claim 4, wherein the control data writing sub-circuit comprises a data control transistor, wherein: the grid electrode of the data control transistor receives the control data writing signal, the drain electrode of the data control transistor is electrically connected with the second end of the energy storage element, the grid electrode of the driving transistor and the second reset sub-circuit, and the source electrode of the data control transistor is electrically connected with the source electrode of the driving transistor and the second light-emitting control sub-circuit.
6. The pixel circuit according to claim 5, wherein the second emission control sub-circuit comprises a second emission control transistor, wherein: the grid electrode of the second light-emitting control transistor receives the light-emitting control signal, the drain electrode of the second light-emitting control transistor is electrically connected with the source electrode of the driving transistor and the source electrode of the data control transistor, and the source electrode of the second light-emitting control transistor is electrically connected with the light-emitting diode.
7. The pixel circuit of claim 5, wherein the second reset sub-circuit comprises a second reset transistor, wherein: the grid electrode of the second reset transistor receives the reset signal, the drain electrode of the second reset transistor is electrically connected with the drain electrode of the data control transistor, the second end of the energy storage element and the grid electrode of the driving transistor, and the source electrode of the second reset transistor is electrically connected with the initialization voltage signal end and writes the initialization voltage into the energy storage element.
8. The pixel circuit according to claim 4, wherein the data writing sub-circuit comprises a switching transistor, a gate of the switching transistor receives the control data writing signal, a source of the switching transistor receives the data voltage, and a drain of the switching transistor is electrically connected to the source of the first light emitting control transistor, the source of the first reset transistor, and the first end of the energy storage element.
9. The pixel circuit according to any of claims 1-8, wherein the driving transistor is a P-type transistor.
10. A display device comprising a display panel and the pixel circuit according to any one of claims 1 to 9 provided in the display panel.
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| CN202110580262.XA CN114038390A (en) | 2021-05-26 | 2021-05-26 | Pixel circuit and display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115440167A (en) * | 2022-08-30 | 2022-12-06 | 惠科股份有限公司 | Pixel circuit, display panel and display device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105206221A (en) * | 2014-06-13 | 2015-12-30 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method, array substrate and display device |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105206221A (en) * | 2014-06-13 | 2015-12-30 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method, array substrate and display device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115440167A (en) * | 2022-08-30 | 2022-12-06 | 惠科股份有限公司 | Pixel circuit, display panel and display device |
| CN115440167B (en) * | 2022-08-30 | 2023-11-07 | 惠科股份有限公司 | Pixel circuit, display panel and display device |
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Application publication date: 20220211 |