CN110136648B - Pixel circuit and OLED display panel - Google Patents
Pixel circuit and OLED display panel Download PDFInfo
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- CN110136648B CN110136648B CN201910397169.8A CN201910397169A CN110136648B CN 110136648 B CN110136648 B CN 110136648B CN 201910397169 A CN201910397169 A CN 201910397169A CN 110136648 B CN110136648 B CN 110136648B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention provides a pixel circuit and an OLED display panel, wherein the pixel circuit comprises: a driving circuit, a light emitting circuit, a switching circuit, a first storage circuit, and a second storage circuit; the second storage circuit is used for charging in a light-emitting stage of a first display frame under the control of the switch circuit and providing working voltage for the driving circuit in a second display frame so as to trigger the driving circuit to drive the light-emitting circuit to emit light. According to the invention, by arranging at least two storage circuits, one storage circuit is charged in the light-emitting stage of the first display frame, and then the working voltage is provided for the driving circuit in the second display frame to trigger the driving circuit to drive the light-emitting circuit to emit light, so that the storage circuit charging and the panel light-emitting are simultaneously carried out, and the charging time can be greatly increased.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel circuit and an OLED display panel.
Background
An existing AMOLED (Active Matrix Organic Light Emitting Diode) display panel is thinner and lighter than a liquid crystal display panel, and thus has a wide application.
At present, a 3T1C pixel circuit architecture as shown in fig. 1 is usually adopted for the development of a large-size AMOLED panel, as shown in fig. 2, in a data signal writing stage of a display frame, a high voltage is firstly input to a scanning line Gate, a switching transistor T1 is turned on to complete the charging of a storage capacitor Cst, at this time, a light emitting switch tube T2 is turned off, and in a light emitting stage of a display frame, a low voltage is input to the scanning line Gate, a switching transistor T1 is turned off, a light emitting switch tube T2 is turned on, and the display panel emits light.
However, as the resolution and the frame frequency are increased, the charging time of the storage capacitor Cst is compressed to be shorter and shorter, which causes the problem that the storage capacitor Cst is not charged enough.
That is, the existing OLED panel has the technical problem that the storage capacitor Cst is not charged enough, and needs to be improved.
Disclosure of Invention
The invention provides a pixel circuit and an OLED display panel, which aim to solve the technical problem that a storage capacitor Cst is insufficiently charged in the conventional OLED panel.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
an embodiment of the present invention provides a pixel circuit, including:
a drive circuit;
a light emitting circuit for emitting light under the drive of the drive circuit;
a switching circuit;
a first storage circuit; and
a second storage circuit;
the first storage circuit is used for charging in a data signal writing stage of a first display frame under the control of the switch circuit and providing working voltage for the driving circuit in a light-emitting stage of the first display frame so as to trigger the driving circuit to drive the light-emitting circuit to emit light; the second storage circuit is used for charging in a light-emitting stage of a first display frame under the control of the switch circuit and providing working voltage for the driving circuit when in a second display frame so as to trigger the driving circuit to drive the light-emitting circuit to emit light.
In the pixel circuit of the present invention, the driving circuit includes a driving transistor, a source of the driving transistor is electrically connected to a power supply voltage, a drain of the driving transistor is electrically connected to the light emitting circuit, and a gate of the driving transistor is electrically connected to the first storage circuit and the second storage circuit.
In the pixel circuit of the present invention, the light emitting circuit includes a light emitting switching tube and a light emitting device.
In the pixel circuit of the present invention, the first storage circuit includes a first capacitor, and the second storage circuit includes a second capacitor.
In the pixel circuit of the present invention, the capacitance values of the first capacitor and the second capacitor are the same.
In the pixel circuit of the invention, the first electrode of the first capacitor and the first electrode of the second capacitor are arranged in the same layer; the second electrode of the first capacitor and the second electrode of the second capacitor are arranged in the same layer.
In the pixel circuit of the present invention, the switch circuit includes a first switch transistor, a first switch, and a first switch, a drain of the first switch transistor is electrically connected to a first pin of the first switch, a second pin of the first switch is electrically connected to the first storage circuit, a third pin of the first switch is electrically connected to the second storage circuit, and the second storage circuit is electrically connected to the driving circuit through the first switch.
In the pixel circuit of the present invention, the switch circuit includes a second switch transistor, a third switch transistor, a second switch, and a third switch, a drain of the second switch transistor is electrically connected to the first memory circuit through the second switch, a drain of the third switch transistor is electrically connected to the second memory circuit, and the second memory circuit is electrically connected to a drain of the second switch transistor through the third switch.
In the pixel circuit of the present invention, the switch circuit includes a fourth switch transistor, a fifth switch transistor, and a second switch, a drain of the fourth switch transistor is electrically connected to the first storage circuit, a drain of the fifth switch transistor is electrically connected to a first pin of the second switch, a second pin of the second switch is electrically connected to the second storage circuit, and a third pin of the second switch is electrically connected to the driving circuit.
The embodiment of the invention also provides an OLED display panel which comprises a pixel array, wherein the pixel array comprises at least one pixel circuit provided by the invention.
The invention has the beneficial effects that:
the invention provides a pixel circuit and an OLED display panel, wherein the pixel circuit comprises: a driving circuit, a light emitting circuit, a switching circuit, a first storage circuit, and a second storage circuit; the first storage circuit is used for charging in a data signal writing stage of a first display frame under the control of the switch circuit and providing working voltage for the driving circuit in a light-emitting stage of the first display frame so as to trigger the driving circuit to drive the light-emitting circuit to emit light; the second storage circuit is used for charging in a light-emitting stage of a first display frame under the control of the switch circuit and providing working voltage for the driving circuit when in a second display frame so as to trigger the driving circuit to drive the light-emitting circuit to emit light. According to the invention, by arranging at least two storage circuits, one storage circuit is charged in the light-emitting stage of the first display frame, and then working voltage is provided for the driving circuit in the second display frame to trigger the driving circuit to drive the light-emitting circuit to emit light, so that the storage circuit charging and the panel light-emitting are simultaneously carried out, the charging time can be greatly increased on the basis, and the technical problem of insufficient charging of the storage capacitor Cst in the existing OLED panel is solved.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a circuit diagram of a conventional pixel circuit;
FIG. 2 is a timing diagram of a conventional pixel circuit;
FIG. 3 is a first circuit diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 4 is a timing diagram illustrating the operation of the pixel circuit shown in FIG. 3;
FIG. 5 is a second circuit diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 6 is a timing diagram illustrating the operation of the pixel circuit shown in FIG. 5;
FIG. 7 is a third circuit diagram of a pixel circuit according to an embodiment of the invention;
fig. 8 is an operation timing diagram of the pixel circuit shown in fig. 7.
Detailed Description
While the embodiments and/or examples of the present invention will be described in detail and fully with reference to the specific embodiments thereof, it should be understood that the embodiments and/or examples described below are only a part of the embodiments and/or examples of the present invention and are not intended to limit the scope of the invention. All other embodiments and/or examples, which can be obtained by a person skilled in the art without making any inventive step, based on the embodiments and/or examples of the present invention, belong to the scope of protection of the present invention.
Directional terms used in the present invention, such as [ upper ], [ lower ], [ left ], [ right ], [ front ], [ rear ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terminology is used for the purpose of describing and understanding the invention and is in no way limiting. The terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature.
Referring to fig. 1 and 2, in the conventional OLED pixel circuit, during a display frame period, during a data signal writing period T2 of a display frame, a high voltage is input to the scan line Gate first, the switching transistor T1 is turned on to complete charging of the storage capacitor Cst, at which time the light emitting switch transistor T2 is turned off, and during a light emitting period T3 of a display frame, a low voltage is input to the scan line Gate, the switching transistor T1 is turned off, the light emitting switch transistor T2 is turned on, and the display panel emits light. However, as the resolution and the frame frequency are increased, the charging time of the storage capacitor Cst is compressed to be shorter and shorter, which causes the problem that the storage capacitor Cst is not charged enough.
Aiming at the technical problem that the storage capacitor Cst of the existing OLED panel is not charged enough, the invention provides a pixel circuit which can solve the problem.
In one embodiment, as shown in fig. 3, the present invention provides a pixel circuit comprising:
a drive circuit 31;
a light emitting circuit 32 for emitting light under the drive of the drive circuit;
a switching circuit 33;
a first memory circuit 34; and
a second storage circuit 35;
the first storage circuit 34 is configured to be charged in a data signal writing stage of a first display frame under the control of the switch circuit, and provide a working voltage to the driving circuit in a light-emitting stage of the first display frame to trigger the driving circuit to drive the light-emitting circuit to emit light; the second storage circuit 35 is configured to be charged in a light-emitting stage of a first display frame under the control of the switch circuit, and provide a working voltage to the driving circuit in a second display frame, so as to trigger the driving circuit to drive the light-emitting circuit to emit light.
The present embodiment provides a pixel circuit, including: a driving circuit, a light emitting circuit, a switching circuit, a first storage circuit, and a second storage circuit; the first storage circuit is used for charging in a data signal writing stage of a first display frame under the control of the switch circuit and providing working voltage for the driving circuit in a light-emitting stage of the first display frame so as to trigger the driving circuit to drive the light-emitting circuit to emit light; the second storage circuit is used for charging in a light-emitting stage of a first display frame under the control of the switch circuit and providing working voltage for the driving circuit when in a second display frame so as to trigger the driving circuit to drive the light-emitting circuit to emit light. According to the invention, by arranging at least two storage circuits, one storage circuit is charged in the light-emitting stage of the first display frame, and then working voltage is provided for the driving circuit in the second display frame to trigger the driving circuit to drive the light-emitting circuit to emit light, so that the storage circuit charging and the panel light-emitting are simultaneously carried out, the charging time can be greatly increased on the basis, and the technical problem of insufficient charging of the storage capacitor Cst in the existing OLED panel is solved.
In one embodiment, as shown in fig. 3, in the pixel circuit of the present invention, the driving circuit 31 includes a driving transistor G, a source of the driving transistor G is electrically connected to the power voltage PW, a drain of the driving transistor G is electrically connected to the light emitting circuit, and a gate of the driving transistor G is electrically connected to the first storage circuit 34 and the second storage circuit 35.
In one embodiment, as shown in fig. 3, in the pixel circuit of the present invention, the light emitting circuit 32 includes a light emitting switching tube EM and a light emitting device EL. The light-emitting switching tube EM is turned on or off under the control of the control signal EM, and then controls the light-emitting device EL to emit light.
In one embodiment, as shown in fig. 3, the light emitting switching tube EM is disposed between the driving transistor G and the light emitting device EL, and the other end of the light emitting device EL is grounded to GND.
In one embodiment, the light-emitting switching tube EM is arranged between the light-emitting device EL and ground GND.
In one embodiment, as shown in fig. 3, in the pixel circuit of the present invention, the first storage circuit 34 includes a first capacitor C1, and the second storage circuit 35 includes a second capacitor C1.
In one embodiment, in the pixel circuit of the present invention, the first storage circuit 34 includes a first inductor, and the second storage circuit 35 includes a second inductor.
In one embodiment, in the pixel circuit of the present invention, the capacitance values of the first capacitor and the second capacitor are the same. Therefore, the same mask plate is convenient to prepare the capacitor, and the calculation of a subsequent algorithm is convenient.
In one embodiment, in the pixel circuit of the present invention, the first electrode of the first capacitor and the first electrode of the second capacitor are disposed in the same layer; the second electrode of the first capacitor and the second electrode of the second capacitor are arranged in the same layer.
A first implementation of the switching circuit 33 will now be described in connection with fig. 3 and 4.
In one embodiment, as shown in fig. 3, in the pixel circuit of the present invention, the switching circuit 33 includes a first switching transistor ST1, a first switching switch SW1, and a first switch K1, the source of the first switching transistor ST1 is electrically connected to a source driver, the storage capacitor is charged according to the Vdata1 voltage, the gate of the first switching transistor ST1 is electrically connected with the gate driving circuit, the on and off control is realized according to a Gate1 signal, the drain of the first switch transistor ST1 is electrically connected with the first pin SW1-1 of the first switch SW1, the second pin SW1-2 of the first switch SW1 is electrically connected to the capacitor C1 of the first storage circuit, the third pin SW1-3 of the first switch SW1 is electrically connected to the capacitor C2 of the second storage circuit, the second memory circuit C2 is electrically connected to the gate of the driving transistor G of the driving circuit through the first switch K1; the first switch SW1 operates under the control of a signal SW 1.
One display frame includes a start phase t1, a data signal writing phase t2, a light emitting phase t3, and a switching phase t 4.
In one embodiment, as shown in fig. 4, the pixel circuit shown in fig. 3 operates according to the following principle:
in t1 of the first display frame, the first switching transistor ST1, the light emitting switching tube EM, and the switch K1 are all turned off, and the first pin SW1-1 and the second pin SW1-2 of the first switching switch SW1 are turned on;
in t2 of the first display frame, Gate1 is at a high potential, the first switching transistor ST1 is turned on, the light emitting switching tube EM and the switch K1 are both turned off, the capacitor C1 is charged, and the charging voltage is the gray scale voltage corresponding to the first display frame;
in t3 of a first display frame, the first pin SW1-1 and the third pin SW1-3 of the first switch SW1 are connected, the Gate1 keeps high potential, the first switch transistor ST1 is turned on to charge the capacitor C2 until the electric quantity of the capacitor C2 is the sum of the electric quantity required by the electric quantity of the capacitor C1 and the electric quantity of the capacitor C2 to reach the potential, the charging time is t5 (may be equal to t3 or less than t3), the charging voltage is a gray scale voltage corresponding to a second display frame, and the switch K1 is turned off; the capacitor C1 provides working voltage for the grid electrode of the driving transistor G, the EM is high potential, the light-emitting switch tube EM is conducted, and the light-emitting device EL emits light;
in t4 of the first display frame, the first switching transistor ST1, the light emitting switching tube EM and the switch K1 are all turned off, the first pin SW1-1 and the second pin SW1-2 of the first switching switch SW1 are turned on, and the light emitting device EL finishes emitting light;
in t1 of the second display frame, the first switching transistor ST1 is turned off, the light emitting switching tube EM and the switch K1 are both turned on, and the first pin SW1-1 and the second pin SW1-2 of the first switching switch SW1 are connected; the capacitor C2 provides working voltage for the grid electrode of the driving transistor G, the EM is high potential, the light-emitting switch tube EM is conducted, and the light-emitting device EL emits light;
the subsequent cycles of t2 to t4 in the second display frame are the same as t2 to t4 in the first display frame, so that the charging and the displaying can be performed in parallel, and the description is omitted.
A second implementation of the switching circuit 33 will now be described in connection with fig. 5 and 6.
In one embodiment, as shown in fig. 5, in the pixel circuit of the present invention, the switch circuit 33 includes a second switch transistor ST2, a third switch transistor ST3, a second switch K2, and a third switch K3, a source of the second switch transistor ST2 is electrically connected to a source driver, the storage capacitor is charged according to a Vdata2 voltage, a Gate of the second switch transistor ST2 is electrically connected to a Gate driving circuit, the on and off control is performed according to a Gate2 signal, a drain of the second switch transistor ST2 is electrically connected to the capacitor C1 of the first storage circuit through the second switch K2, a source of the third switch transistor ST3 is electrically connected to the source driver, the storage capacitor is charged according to the Vdata3 voltage, a Gate of the third switch transistor ST3 is electrically connected to the Gate driving circuit, the on and off control is performed according to a Gate3 signal, a drain of the third switch transistor ST3 is electrically connected to the capacitor C2 of the second storage circuit, the capacitor C2 of the second storage circuit is electrically connected to the drain of the second switching transistor ST2 through the third switch K3.
In one embodiment, as shown in fig. 6, the pixel circuit shown in fig. 5 operates according to the following principle:
in t1 of the first display frame, the second switching transistor ST2, the third switching transistor ST3, the switch K2, the switch K3, and the light emitting switching tube EM are all turned off;
in t2 of the first display frame, Gate2 is at a high potential, the second switching transistor ST2 is turned on, the light emitting switching tube EM is turned off to charge the capacitor C1, and the charging voltage is a gray scale voltage corresponding to the first display frame;
in t3 of the first display frame, Gate3 is at a high potential, the third switching transistor ST3 is turned on to charge the capacitor C2 until the electric quantity of the capacitor C2 is the sum of the electric quantity of the capacitor C1 and the electric quantity of the capacitor C2 required to reach the potential, the charging time is t5 (may be equal to t3 or less than t3), and the charging voltage is a gray scale voltage corresponding to the second display frame; the Gate2 becomes a low potential, the second switching transistor ST2 is turned off, the capacitor C1 supplies a working voltage to the Gate of the driving transistor G, the EM is a high potential, the light emitting switching tube EM is turned on, and the light emitting device EL emits light;
in t4 of the first display frame, the second switching transistor ST2, the third switching transistor ST3, the switch K2, the switch K3, and the light emitting switching tube EM are all turned off, and the light emitting device EL finishes emitting light;
in t1 of the second display frame, the second switching transistor ST2 and the third switching transistor ST3 are kept off, the switch K2 is closed, the switch K3 is closed, the light-emitting switching tube EM is turned on, the capacitor C2 supplies the operating voltage to the gate of the driving transistor G, the EM is at a high potential, the light-emitting switching tube EM is turned on, and the light-emitting device EL emits light;
the subsequent cycles of t2 to t4 in the second display frame are the same as t2 to t4 in the first display frame, so that the charging and the displaying can be performed in parallel, and the description is omitted.
In one embodiment, the capacitor C1 and the capacitor C2 are charged synchronously, that is, in t2 of the first display frame, the Gate2 is at a high potential, the second switching transistor ST2 is turned on, the light emitting switching tube EM is turned off to charge the capacitor C1, and the charging voltage is the gray scale voltage corresponding to the first display frame; the Gate3 is at a high potential, the third switching transistor ST3 is turned on to charge the capacitor C2 until the electric quantity of the capacitor C2 is the sum of the electric quantities of the capacitor C1 and the capacitor C2 required to reach the potentials, the charging time is t5 (which may be equal to t3 or less than t3), the charging voltage is a gray scale voltage corresponding to the second display frame, after the capacitor C2 is charged, the Gate3 is at a low potential, and the third switching transistor ST3 is turned off.
A third implementation of the switching circuit 33 is now described in connection with fig. 7 and 8.
In one embodiment, as shown in fig. 7, in the pixel circuit of the present invention, the switching circuit 33 includes a fourth switching transistor ST4, a fifth switching transistor ST5, a second switching switch SW2, a source of the fourth switching transistor ST4 is electrically connected to a source driver, a storage capacitor is charged according to a Vdata4 voltage, a Gate of the fourth switching transistor ST4 is electrically connected to a Gate driving circuit, on and off control is performed according to a Gate4 signal, a drain of the fourth switching transistor ST4 is electrically connected to a capacitor C1 of the first storage circuit, a source of the fifth switching transistor ST5 is electrically connected to the source driver, a storage capacitor is charged according to a Vdata5 voltage, a Gate of the fifth switching transistor ST5 is electrically connected to the Gate driving circuit, on and off control is performed according to a Gate5 signal, a drain of the fifth switching transistor ST5 is electrically connected to a first switching pin SW2-1 of the second switching transistor SW2, the second pin SW2-2 of the second switch SW2 is electrically connected to the capacitor C2 of the second storage circuit, and the third pin SW2-3 of the second switch SW2 is electrically connected to the gate of the driving transistor G of the driving circuit; the second switch SW2 operates under the control of signal SW 2.
In one embodiment, as shown in fig. 8, the pixel circuit shown in fig. 7 operates on the following principle:
in t1 of the first display frame, the fourth switching transistor ST4, the fifth switching transistor ST5 and the light emitting switching tube EM are all turned off, and the first pin SW2-1 and the second pin SW2-2 of the second switching switch SW2 are turned on;
in t2 of the first display frame, Gate4 is at a high potential, the fourth switching transistor ST4 is turned on, the light emitting switching tube EM is turned off to charge the capacitor C1, and the charging voltage is a gray scale voltage corresponding to the first display frame;
in t3 of the first display frame, Gate5 is at a high potential, the fifth switching transistor ST5 is turned on to charge the capacitor C2 until the electric quantity of the capacitor C2 is the sum of the electric quantities of the capacitor C1 and the capacitor C2 required to reach the potentials, the charging time is t5 (may be equal to t3 or less than t3), and the charging voltage is a gray scale voltage corresponding to the second display frame; when the Gate4 becomes a low potential, the fourth switching transistor ST4 is turned off, the capacitor C1 supplies a working voltage to the Gate of the driving transistor G, the EM is a high potential, the light emitting switching tube EM is turned on, and the light emitting device EL emits light;
in t4 of the first display frame, the fourth switching transistor ST4, the fifth switching transistor ST5 and the light emitting switching tube EM are all turned off, the first pin SW2-1 and the second pin SW2-2 of the second switching switch SW2 are turned on, and the light emitting device EL finishes emitting light;
in t1 of a second display frame, the fourth switching transistor ST4 and the fifth switching transistor ST5 are turned off, the third pin SW2-3 and the second pin SW2-2 of the second switch SW2 are connected, the light emitting switching tube EM is turned on, the capacitor C2 supplies an operating voltage to the gate of the driving transistor G, the EM is at a high potential, the light emitting switching tube EM is turned on, and the light emitting device EL emits light;
the subsequent cycles of t2 to t4 in the second display frame are the same as t2 to t4 in the first display frame, so that the charging and the displaying can be performed in parallel, and the description is omitted.
In one embodiment, the capacitor C1 and the capacitor C2 are charged synchronously, that is, in t2 of the first display frame, the Gate4 is at a high potential, the fourth switching transistor ST4 is turned on, the light emitting switching tube EM is turned off to charge the capacitor C1, and the charging voltage is the gray scale voltage corresponding to the first display frame; the Gate5 is at a high potential, the fifth switching transistor ST5 is turned on to charge the capacitor C2 until the electric quantity of the capacitor C2 is the sum of the electric quantities of the capacitor C1 and the capacitor C2 required by the potentials, the charging time is t5 (which may be equal to t3 or less than t3), the charging voltage is a gray scale voltage corresponding to the second display frame, after the capacitor C2 is charged, the Gate5 is at a low potential, and the fifth switching transistor ST5 is turned off.
Meanwhile, the present invention also provides an OLED display panel, which includes a pixel array including at least one pixel circuit provided by the present invention, as shown in fig. 3, the pixel circuit includes:
the pixel circuit includes:
a drive circuit 31;
a light emitting circuit 32 for emitting light under the drive of the drive circuit;
a switching circuit 33;
a first memory circuit 34; and
a second storage circuit 35;
the first storage circuit 34 is configured to be charged in a data signal writing stage of a first display frame under the control of the switch circuit, and provide a working voltage to the driving circuit in a light-emitting stage of the first display frame to trigger the driving circuit to drive the light-emitting circuit to emit light; the second storage circuit 35 is configured to be charged in a light-emitting stage of a first display frame under the control of the switch circuit, and provide a working voltage to the driving circuit in a second display frame, so as to trigger the driving circuit to drive the light-emitting circuit to emit light.
The present embodiment provides an OLED display panel, a pixel circuit of which includes: a driving circuit, a light emitting circuit, a switching circuit, a first storage circuit, and a second storage circuit; the first storage circuit is used for charging in a data signal writing stage of a first display frame under the control of the switch circuit and providing working voltage for the driving circuit in a light-emitting stage of the first display frame so as to trigger the driving circuit to drive the light-emitting circuit to emit light; the second storage circuit is used for charging in a light-emitting stage of a first display frame under the control of the switch circuit and providing working voltage for the driving circuit when in a second display frame so as to trigger the driving circuit to drive the light-emitting circuit to emit light. According to the invention, by arranging at least two storage circuits, one storage circuit is charged in the light-emitting stage of the first display frame, and then working voltage is provided for the driving circuit in the second display frame to trigger the driving circuit to drive the light-emitting circuit to emit light, so that the storage circuit charging and the panel light-emitting are simultaneously carried out, the charging time can be greatly increased on the basis, and the technical problem of insufficient charging of the storage capacitor Cst in the existing OLED panel is solved.
In one embodiment, in the OLED display panel of the present invention, the driving circuit 31 includes a driving transistor G, a source of the driving transistor G is electrically connected to the power voltage PW, a drain of the driving transistor G is electrically connected to the light emitting circuit, and a gate of the driving transistor G is electrically connected to the first storage circuit 34 and the second storage circuit 35.
In one embodiment, in the OLED display panel of the present invention, the light emitting circuit 32 includes a light emitting switching tube EM and a light emitting device EL. The light-emitting switching tube EM is turned on or off under the control of the control signal EM, and then controls the light-emitting device EL to emit light.
In one embodiment, in the OLED display panel of the present invention, the light emitting switching tube EM is disposed between the driving transistor G and the light emitting device EL, and the other end of the light emitting device EL is grounded to GND.
In one embodiment, in the OLED display panel of the present invention, the light emitting switching tube EM is disposed between the light emitting device EL and the ground GND.
In one embodiment, in the OLED display panel of the present invention, the first storage circuit 34 includes a first capacitor C1, and the second storage circuit 35 includes a second capacitor C1.
In one embodiment, in the OLED display panel of the present invention, the first storage circuit 34 includes a first inductor, and the second storage circuit 35 includes a second inductor.
In one embodiment, in the OLED display panel of the present invention, the capacitance values of the first capacitor and the second capacitor are the same. Therefore, the same mask plate is convenient to prepare the capacitor, and the calculation of a subsequent algorithm is convenient.
In one embodiment, in the OLED display panel of the present invention, the first electrode of the first capacitor and the first electrode of the second capacitor are disposed in the same layer; the second electrode of the first capacitor and the second electrode of the second capacitor are arranged in the same layer.
In one embodiment, in the OLED display panel of the present invention, the switch circuit 33 includes a first switch transistor ST1, a first switch SW1, and a first switch K1, the source of the first switch transistor ST1 is electrically connected to a source driver, the storage capacitor is charged according to the Vdata1 voltage, the gate of the first switching transistor ST1 is electrically connected with the gate driving circuit, the on and off control is realized according to a Gate1 signal, the drain of the first switch transistor ST1 is electrically connected with the first pin SW1-1 of the first switch SW1, the second pin SW1-2 of the first switch SW1 is electrically connected to the capacitor C1 of the first storage circuit, the third pin SW1-3 of the first switch SW1 is electrically connected to the capacitor C2 of the second storage circuit, the second memory circuit C2 is electrically connected to the gate of the driving transistor G of the driving circuit through the first switch K1; the first switch SW1 operates under the control of a signal SW 1.
In one embodiment, in the OLED display panel of the present invention, the switching circuit 33 includes a second switching transistor ST2, a third switching transistor ST3, a second switch K2, and a third switch K3, a source of the second switching transistor ST2 is electrically connected to a source driver, the storage capacitor is charged according to a Vdata2 voltage, a Gate of the second switching transistor ST2 is electrically connected to a Gate driving circuit, on and off control is performed according to a Gate2 signal, a drain of the second switching transistor ST2 is electrically connected to the capacitor C1 of the first storage circuit through the second switch K2, a source of the third switching transistor ST3 is electrically connected to the source driver, the storage capacitor is charged according to a Vdata3 voltage, a Gate of the third switching transistor ST3 is electrically connected to the Gate driving circuit, on and off control is performed according to a Gate3 signal, a drain of the third switching transistor ST3 is electrically connected to the capacitor C2 of the second storage circuit, the capacitor C2 of the second storage circuit is electrically connected to the drain of the second switching transistor ST2 through the third switch K3.
In one embodiment, in the OLED display panel of the present invention, the switching circuit 33 includes a fourth switching transistor ST4, a fifth switching transistor ST5, and a second switching switch SW2, a source of the fourth switching transistor ST4 is electrically connected to a source driver, a storage capacitor is charged according to a Vdata4 voltage, a Gate of the fourth switching transistor ST4 is electrically connected to a Gate driving circuit, on and off control is performed according to a Gate4 signal, a drain of the fourth switching transistor ST4 is electrically connected to the capacitor C1 of the first storage circuit, a source of the fifth switching transistor ST5 is electrically connected to the source driver, a storage capacitor is charged according to a Vdata5 voltage, a Gate of the fifth switching transistor ST5 is electrically connected to the Gate driving circuit, on and off control is performed according to a Gate5 signal, a drain of the fifth switching transistor ST5 is electrically connected to a first pin SW2-1 of the second switching switch SW2, the second pin SW2-2 of the second switch SW2 is electrically connected to the capacitor C2 of the second storage circuit, and the third pin SW2-3 of the second switch SW2 is electrically connected to the gate of the driving transistor G of the driving circuit; the second switch SW2 operates under the control of signal SW 2.
According to the above embodiments:
the invention provides a pixel circuit and an OLED display panel, wherein the pixel circuit comprises: a driving circuit, a light emitting circuit, a switching circuit, a first storage circuit, and a second storage circuit; the first storage circuit is used for charging in a data signal writing stage of a first display frame under the control of the switch circuit and providing working voltage for the driving circuit in a light-emitting stage of the first display frame so as to trigger the driving circuit to drive the light-emitting circuit to emit light; the second storage circuit is used for charging in a light-emitting stage of a first display frame under the control of the switch circuit and providing working voltage for the driving circuit when in a second display frame so as to trigger the driving circuit to drive the light-emitting circuit to emit light. According to the invention, by arranging at least two storage circuits, one storage circuit is charged in the light-emitting stage of the first display frame, and then working voltage is provided for the driving circuit in the second display frame to trigger the driving circuit to drive the light-emitting circuit to emit light, so that the storage circuit charging and the panel light-emitting are simultaneously carried out, the charging time can be greatly increased on the basis, and the technical problem of insufficient charging of the storage capacitor Cst in the existing OLED panel is solved.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.
Claims (10)
1. A pixel circuit, comprising:
a drive circuit;
a light emitting circuit for emitting light under the drive of the drive circuit;
a switching circuit;
a first storage circuit; and
a second storage circuit;
the first storage circuit is used for charging in a data signal writing stage of a first display frame under the control of the switch circuit and providing working voltage for the driving circuit in a light-emitting stage of the first display frame so as to trigger the driving circuit to drive the light-emitting circuit to emit light; the second storage circuit is used for charging in a light-emitting stage of a first display frame under the control of the switch circuit and providing working voltage for the driving circuit when in a second display frame so as to trigger the driving circuit to drive the light-emitting circuit to emit light.
2. The pixel circuit according to claim 1, wherein the driving circuit comprises a driving transistor, a source of the driving transistor is electrically connected to a power supply voltage, a drain of the driving transistor is electrically connected to the light emitting circuit, and a gate of the driving transistor is electrically connected to the first storage circuit and the second storage circuit.
3. The pixel circuit according to claim 1, wherein the light emitting circuit comprises a light emitting switching tube and a light emitting device.
4. The pixel circuit according to claim 1, wherein the first storage circuit comprises a first capacitance and the second storage circuit comprises a second capacitance.
5. The pixel circuit according to claim 4, wherein the capacitance values of the first capacitor and the second capacitor are the same.
6. The pixel circuit according to claim 4, wherein the first electrode of the first capacitor and the first electrode of the second capacitor are disposed in a same layer; the second electrode of the first capacitor and the second electrode of the second capacitor are arranged in the same layer.
7. The pixel circuit according to claim 1, wherein the switch circuit comprises a first switch transistor, a first switch, and a first switch, a drain of the first switch transistor is electrically connected to a first pin of the first switch, a second pin of the first switch is electrically connected to the first storage circuit, a third pin of the first switch is electrically connected to the second storage circuit, and the second storage circuit is electrically connected to the driving circuit through the first switch.
8. The pixel circuit according to claim 1, wherein the switch circuit includes a second switch transistor, a third switch transistor, a second switch, and a third switch, a drain of the second switch transistor is electrically connected to the first memory circuit through the second switch, a drain of the third switch transistor is electrically connected to the second memory circuit, and the second memory circuit is electrically connected to a drain of the second switch transistor through the third switch.
9. The pixel circuit according to claim 1, wherein the switch circuit comprises a fourth switch transistor, a fifth switch transistor and a second switch, a drain of the fourth switch transistor is electrically connected to the first storage circuit, a drain of the fifth switch transistor is electrically connected to a first pin of the second switch, a second pin of the second switch is electrically connected to the second storage circuit, and a third pin of the second switch is electrically connected to the driving circuit.
10. An OLED display panel comprising a pixel array including at least one pixel circuit as claimed in any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910397169.8A CN110136648B (en) | 2019-05-14 | 2019-05-14 | Pixel circuit and OLED display panel |
| PCT/CN2019/104373 WO2020228190A1 (en) | 2019-05-14 | 2019-09-04 | Pixel circuit and oled display panel |
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| CN201910397169.8A CN110136648B (en) | 2019-05-14 | 2019-05-14 | Pixel circuit and OLED display panel |
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| CN110136648B true CN110136648B (en) | 2020-10-16 |
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| CN110136648B (en) * | 2019-05-14 | 2020-10-16 | 深圳市华星光电半导体显示技术有限公司 | Pixel circuit and OLED display panel |
| TWI715303B (en) * | 2019-11-21 | 2021-01-01 | 友達光電股份有限公司 | Light emitting diode driving circuit and light emitting diode display panel including the same |
| CN110930949A (en) * | 2019-12-17 | 2020-03-27 | 昆山国显光电有限公司 | Pixel circuit and display panel |
| CN110992886B (en) * | 2019-12-25 | 2022-07-29 | 昆山国显光电有限公司 | Pixel driving circuit and driving method thereof |
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| Publication number | Publication date |
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| WO2020228190A1 (en) | 2020-11-19 |
| CN110136648A (en) | 2019-08-16 |
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