CN108877675B - Pixel circuit, display panel, driving method of display panel and display device - Google Patents
Pixel circuit, display panel, driving method of display panel and display device Download PDFInfo
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- CN108877675B CN108877675B CN201810858684.7A CN201810858684A CN108877675B CN 108877675 B CN108877675 B CN 108877675B CN 201810858684 A CN201810858684 A CN 201810858684A CN 108877675 B CN108877675 B CN 108877675B
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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]
- G09G3/3275—Details of drivers for data electrodes
Abstract
The invention discloses a pixel circuit, a display panel, a driving method thereof and a display device, wherein the pixel circuit comprises: the constant current control module, the switch module, the first light emitting device and the second light emitting device; the constant current control module is used for generating a first constant current signal according to a first signal of the data signal line and controlling the first light-emitting device to emit light under the driving of the first constant current signal through the conducted switch module; and the second light-emitting device is controlled by the switched-on switch module to emit light under the driving of the second constant current signal, wherein the polarity of the second signal of the data signal line is opposite to that of the first signal. The pixel circuit provided by the invention drives the light-emitting device at constant current, so that the working current of the light-emitting device is not influenced by the line impedance any more, and the display quality is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel circuit, a display panel, a driving method of the display panel and a display device.
Background
With the development of the display industry, the organic electroluminescent display (OLED) technology has been gaining popularity and attention due to its advantages of self-luminescence, wide viewing angle, high contrast, low power consumption, fast response speed, etc., and the possibility of highly portable and foldable display technology.
Currently, the OLED technology can be divided into Passive Matrix (PMOLED) and Active Matrix (AMOLED) according to the driving method. However, in both driving modes, the operating current flowing through the light emitting device is affected by the line impedance, resulting in poor display quality.
Disclosure of Invention
Embodiments of the present invention provide a pixel circuit, a display panel, a driving method thereof, a display device, and a display device, so as to solve the problem in the prior art that a working current flowing through a light emitting device is affected by a line impedance.
Therefore, an embodiment of the present invention provides a pixel circuit, including: the constant current control module, the switch module, the first light emitting device and the second light emitting device;
the constant current control module is respectively connected with a data signal line, a first power supply end, a second power supply end, a first pole of the first light-emitting device and a second pole of the second light-emitting device, and the switch module is respectively connected with a scanning signal line, the second pole of the first light-emitting device and the first pole of the second light-emitting device;
the constant current control module is used for generating a first constant current signal according to a first signal of the data signal line and controlling the first light-emitting device to emit light under the driving of the first constant current signal through the switched-on switch module; the second light emitting device is used for generating a second constant current signal according to a second signal of the data signal line and controlling the second light emitting device to emit light under the driving of the second constant current signal through the switched-on switch module; wherein the second signal of the data signal line has a polarity opposite to that of the first signal.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the constant current control module includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and an operational amplifier;
one end of the first resistor is connected with the inverting input end of the operational amplifier, and the other end of the first resistor is grounded;
one end of the second resistor is connected with the inverting input end of the operational amplifier, and the other end of the second resistor is connected with the output end of the operational amplifier;
one end of the third resistor is connected with the data signal line, and the other end of the third resistor is connected with the non-inverting input end of the operational amplifier;
one end of the fourth resistor is connected with the non-inverting input end of the operational amplifier, and the other end of the fourth resistor is respectively connected with the first pole of the first light-emitting device and the second pole of the second light-emitting device;
one end of the fifth resistor is connected with the output end of the operational amplifier, and the other end of the fifth resistor is respectively connected with the first pole of the first light-emitting device and the second pole of the second light-emitting device;
and the first control end of the operational amplifier is connected with the first power supply end, and the second control end of the operational amplifier is connected with the second power supply end.
In a possible implementation manner, in the pixel circuit provided in the embodiment of the present invention, under the condition that the resistance value of the first resistor is equal to the resistance value of the third resistor, and the resistance value of the second resistor is equal to the sum of the resistance value of the fourth resistor and the resistance value of the fifth resistor, the relationship between the first constant current signal and the resistance value of the third resistor, the resistance value of the fourth resistor, the resistance value of the fifth resistor, and the first signal of the data signal line is as follows:
wherein, I1Is the first constant current signal, r3Is the resistance value of the third resistor, r4Is the resistance value of the fourth resistor, r5Is the resistance value of the fifth resistor, VDataIs a first signal of the data signal line.
In a possible implementation manner, in the pixel circuit provided in the embodiment of the present invention, under the condition that the resistance value of the first resistor is equal to the resistance value of the third resistor, and the resistance value of the second resistor is equal to the sum of the resistance value of the fourth resistor and the resistance value of the fifth resistor, the relationship between the second constant current signal and the resistance value of the third resistor, the resistance value of the fourth resistor, the resistance value of the fifth resistor, and the second signal of the data signal line is as follows:
wherein, I2Is the second constant current signal, r3Is the resistance value of the third resistor, r4Is the resistance value of the fourth resistor, r5Is the resistance value of the fifth resistor, -VDataIs a second signal of the data signal line.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the switch module includes: and the grid electrode of the switch transistor is connected with the scanning signal line, the first pole of the switch transistor is grounded, and the second pole of the switch transistor is respectively connected with the second pole of the first light-emitting device and the first pole of the second light-emitting device.
Based on the same inventive concept, an embodiment of the present invention further provides a display panel, including a plurality of pixel circuits arranged in an array, where the pixel circuit is any one of the pixel circuits described above.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the first light emitting device and the second light emitting device in the pixel circuit in the same column share the same constant current control module; each constant current control module is connected with the data signal lines in a one-to-one correspondence manner; and the first light-emitting device and the second light-emitting device in each row of the pixel circuits are correspondingly connected with the scanning signal lines one by one through the corresponding switch modules.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the constant current control module is located in a non-display area of the display panel or is integrated in the data driving circuit.
Correspondingly, an embodiment of the present invention further provides a driving method of the display panel, including:
in the first stage, the constant current control module generates a first constant current signal according to a first signal of a data signal line, and controls a corresponding first light-emitting device to emit light under the driving of the first constant current signal through a switch module conducted in a row of pixel circuits;
in the second stage, the constant current control module generates a second constant current signal according to a second signal of the data signal line, and controls the corresponding second light-emitting device to emit light under the driving of the second constant current signal through the switch modules conducted in the pixel circuits in one row; wherein the second signal of the data signal line has a polarity opposite to that of the first signal.
Based on the same inventive concept, the embodiment of the invention also provides a display device, which comprises the display panel.
The invention has the following beneficial effects:
the embodiment of the invention provides a pixel circuit, a display panel, a driving method thereof and a display device, wherein the pixel circuit comprises: the constant current control module, the switch module, the first light emitting device and the second light emitting device; the constant current control module is respectively connected with the data signal line, the first power supply end, the second power supply end, the first pole of the first light-emitting device and the second pole of the second light-emitting device, and the switch module is respectively connected with the scanning signal line, the second pole of the first light-emitting device and the first pole of the second light-emitting device; the constant current control module is used for generating a first constant current signal according to a first signal of the data signal line and controlling the first light-emitting device to emit light under the driving of the first constant current signal through the conducted switch module; the second constant current signal is generated according to a second signal of the data signal line, and the second light-emitting device is controlled to emit light under the driving of the second constant current signal through the conducted switch module; the polarity of the second signal of the data signal line is opposite to that of the first signal. The pixel circuit provided by the invention can drive the light-emitting device at constant current, so that the working current of the light-emitting device is not influenced by the line impedance any more, and the display quality is improved.
Drawings
Fig. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a specific structure of the pixel circuit shown in FIG. 1;
fig. 3 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 4 is a timing diagram illustrating operation of the display panel shown in FIG. 3;
fig. 5 is a flowchart of a driving method of the display panel shown in fig. 3.
Detailed Description
The following describes in detail specific embodiments of a pixel circuit, a display panel, a driving method thereof, and a display device according to embodiments of the present invention with reference to the accompanying drawings. It should be noted that the embodiments described in this specification are only a part of the embodiments of the present invention, and not all embodiments; and in case of conflict, the embodiments and features of the embodiments in the present application may be combined with each other; moreover, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the present invention.
A pixel circuit provided in an embodiment of the present invention, as shown in fig. 1, includes: a constant current control module 101, a switch module 102, a first light emitting device OLED (n,2m-1) and a second light emitting device OLED (n,2 m);
the constant current control module 101 is connected to the data signal line data (n), the first power terminal VCC +, the second power terminal VCC-, a first pole of the first light emitting device OLED (n,2m-1), and a second pole of the second light emitting device OLED (n,2m), respectively, and the switch module 102 is connected to the scanning signal line gate (m), a second pole of the first light emitting device OLED (n,2m-1), and a first pole of the second light emitting device OLED (n,2m), respectively;
the constant current control module 101 is configured to generate a first constant current signal according to a first signal of the data signal line data (n), and control the first light emitting device OLED (n,2m-1) to emit light under the driving of the first constant current signal through the turned-on switch module 102; the second constant current signal is generated according to a second signal of the data signal line data (n), and the turned-on switch module 102 controls the second light emitting device OLED (n,2m) to emit light under the driving of the second constant current signal; the polarity of the second signal of the data signal line data (n) is opposite to that of the first signal.
In the pixel circuit provided by the embodiment of the invention, the constant current control module 101 and the switch module 102 can drive the light emitting device at a constant current, so that the working current of the light emitting device is not affected by the line impedance any more, and the display quality is improved.
In order to better understand the structure of the pixel circuit provided by the embodiment of the present invention, a specific embodiment is described in detail below.
Specifically, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 2, the constant current control module 101 includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and an operational amplifier A;
one end of the first resistor R1 is connected with the inverting input end of the operational amplifier A, and the other end is grounded;
one end of the second resistor R2 is connected with the inverting input end of the operational amplifier A, and the other end of the second resistor R2 is connected with the output end of the operational amplifier A;
one end of the third resistor R3 is connected to the data signal line data (n), and the other end is connected to the non-inverting input terminal of the operational amplifier a;
one end of the fourth resistor R4 is connected with the non-inverting input end of the operational amplifier A, and the other end is respectively connected with the first pole of the first light-emitting device OLED (n,2m-1) and the second pole of the second light-emitting device OLED (n,2 m);
one end of the fifth resistor R5 is connected with the output end of the operational amplifier A, and the other end is respectively connected with the first pole of the first light-emitting device OLED (n,2m-1) and the second pole of the second light-emitting device OLED (n,2 m);
the first control end of the operational amplifier A is connected with a first power supply end VCC +, and the second control end is connected with a second power supply end VCC-, namely, a positive power supply and a negative power supply are adopted to supply power to the operational amplifier A.
Further, in the pixel circuit provided in the embodiment of the invention, under the condition that the resistance value of the first resistor R1 is equal to the resistance value of the third resistor R3, and the resistance value of the second resistor R2 is equal to the sum of the resistance value of the fourth resistor R4 and the resistance value of the fifth resistor R5, the relationship between the first constant current signal and the first signal of the third resistor R3, the resistance value of the fourth resistor R4, the resistance value of the fifth resistor R5, and the first signal of the data signal line data (n) is as follows:
wherein, I1Is a first constant current signal, r3Is the resistance value, R, of the third resistor R34Is the resistance value, R, of the fourth resistor R45Is the resistance value, V, of the fifth resistor R5DataIs the first signal of the data signal line data (n).
In the pixel circuit provided in the embodiment of the invention, under the condition that the resistance value of the first resistor R1 is equal to the resistance value of the third resistor R3, and the resistance value of the second resistor R2 is equal to the sum of the resistance value of the fourth resistor R4 and the resistance value of the fifth resistor R5, the relationship between the second constant current signal and the second signal of the third resistor R3, the resistance value of the fourth resistor R4, the resistance value of the fifth resistor R5, and the second signal of the data signal line data (n) is as follows:
wherein, I2Is a second constant current signal, r3Is the resistance value, R, of the third resistor R34Is the resistance value, R, of the fourth resistor R45Is the resistance value, -V of the fifth resistor R5DataA second signal of the data signal line data (n).
It should be understood that, in the pixel circuit provided by the present invention, the resistance of the first resistor R1 is set to be equal to the resistance of the third resistor R3, and the resistance of the second resistor R2 is set to be equal to the sum of the resistance of the fourth resistor R4 and the resistance of the fifth resistor R5, which is only one possible value of each resistor, but the resistance of each resistor may be specifically selected according to practical applications, and is not limited herein.
In addition, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 2, the switch module 102 includes: and a switching transistor VT, a gate of which is connected to the scanning signal line gate (m), a first pole of which is grounded, and a second pole of which is connected to the second pole of the first light emitting device OLED (n,2m-1) and the first pole of the second light emitting device OLED (n,2m), respectively.
It should be noted that the above is only an example of the specific structure of each block in the pixel circuit, and actually, the specific structure of each block is not limited to the above structure provided by the embodiment of the present invention, and may be other structures known to those skilled in the art.
In addition, the switching transistor mentioned in the above embodiments of the present invention may be a Thin Film Transistor (TFT) or a Metal Oxide Semiconductor field effect transistor (MOS), and is not limited herein. Also, the switching transistor may be a P-type transistor or an N-type transistor. In practical application, the functions of the first pole and the second pole can be exchanged according to the type of the switching transistor and the difference of input signals without specific distinction.
Based on the same inventive concept, an embodiment of the present invention provides a display panel, including a plurality of pixel circuits arranged in an array. Because the principle of solving the problem of the display panel is similar to that of solving the problem of the pixel circuit, the implementation of the display panel provided by the embodiment of the present invention can refer to the implementation of the pixel circuit provided by the embodiment of the present invention, and repeated details are not repeated.
Moreover, in order to simplify the overall structure of the pixel circuit on the display panel, in the display panel provided in the embodiment of the present invention, as shown in fig. 3, the first light emitting device OLED (n,2m-1) and the second light emitting device OLED (n,2m) in the same column of pixel circuits share the same constant current control module 101; each constant current control module 101 is connected with data signal lines data (n) in a one-to-one correspondence manner; the first light emitting device OLED (n,2m-1) and the second light emitting device OLED (n,2m) in each row of pixel circuits are connected to the scanning signal lines gate (m) in a one-to-one correspondence through the corresponding switch modules 102.
Further, in order to increase the aperture ratio of the display panel, as shown in fig. 3, in the display panel provided in the embodiment of the present invention, the constant current control module 101 is located in a non-display area of the display panel or integrated in the data driving circuit, that is, only the switch module 102, the first light emitting device OLED (n,2m-1), and the second light emitting device OLED (n,2m) in the pixel circuit are located in the display area AA.
In order to better understand the technical solution of the present invention, the following is a detailed description of the specific working principle of the display panel shown in fig. 3. The switching transistor VT is an N-type transistor, and is switched on under the action of a high level and switched off under the action of a low level; the first signal of the data signal line data (n) is a positive voltage, and the second signal is a negative voltage; the resistance of the first resistor R1 is equal to the resistance of the third resistor R3, the resistance of the second resistor R2 is equal to the sum of the resistance of the fourth resistor R4 and the resistance of the fifth resistor R5, and the resistance of the first resistor R1, the resistance of the second resistor R2, the resistance of the third resistor R3 and the resistance of the fourth resistor R4 are much larger than the resistance of the fifth resistor R5. Fig. 3 is a corresponding operation timing diagram shown in fig. 4, where TP in fig. 4 is a frame on signal.
In the first stage, each first light-emitting device OLED (n,2m-1) in the pixel circuit of the mth row is driven to emit light, wherein m and n are positive integers. Specifically, the scanning signal line gate (m) connected to the m-th row of pixel circuits outputs a high level, each switching transistor VT included in the row of pixel circuits is turned on by the high level of the scanning signal line gate (m), and at this stage, the data signal line data (n) connected to the row of pixel circuits outputs a positive voltage (i.e., the first signal VData) The first constant current signal passes throughThe first light-emitting device OLED (n,2m-1) and the switching transistor VT are connected to the ground, so that the first light-emitting device OLED (n,2m-1) emits light under the driving of a first constant current signal to realize display; although the switching transistor VT is turned on, the second light emitting devices OLED (n,2m) in the pixel circuits in the row are turned off by receiving the reverse voltage, that is, the second light emitting devices OLED (n,2m) do not emit light. And the first constant current signal driving the first light emitting device OLED (n,2m-1) may be calculated by the following formula:
wherein, I1Is the first constant current signal, r3Is the resistance value, R, of the third resistor R34Is the resistance value, R, of the fourth resistor R45Is the resistance value, V, of the fifth resistor R5DataIs a first signal of the data signal line.
As can be seen from the above formula, the resistance R of the third resistor R33A resistance R of the fourth resistor R44And the resistance R of the fifth resistor R55Therefore, the working current of the first light-emitting device OLED (n,2m-1) is only related to the voltage of the data signal line data (n), so that the working current of the first light-emitting device OLED (n,2m-1) can be adjusted by adjusting the voltage of the data signal line data (n), constant current driving is realized, and the influence of line resistance is avoided.
And in the second stage, driving each second light-emitting device OLED (n,2m) in the pixel circuit of the mth row to emit light, wherein m and n are positive integers. Specifically, the scanning signal line gate (m) connected to the m-th row of pixel circuits outputs a high level, each switching transistor VT included in the row of pixel circuits is turned on by the high level of the scanning signal line gate (m), and at this stage, the data signal line data (n) connected to the row of pixel circuits outputs a negative voltage (i.e., the second signal-V)Data) The second constant current signal sequentially passes through the ground and the switching transistor VT to the second light emitting device OLED (n,2m), so that the second light emitting device OLED (n,2m) emits light under the driving of the second constant current signal to realize display; while the switching transistor VT is turned on, the pixel circuits in the row are connectedEach of the first light emitting devices OLED (n,2m-1) is turned off by receiving a back pressure, i.e., the first light emitting device OLED (n,2m-1) does not emit light. And the second constant current signal driving the second light emitting device OLED (n,2m) may be calculated by the following formula:
wherein, I2Is the second constant current signal, r3Is the resistance value, R, of the third resistor R34Is the resistance value, R, of the fourth resistor R45Is the resistance value, V, of the fifth resistor R5DataIs a first signal of the data signal line.
As can be seen from the above formula, the resistance R of the third resistor R33A resistance R of the fourth resistor R44And the resistance R of the fifth resistor R55Therefore, the operating current of the second light emitting device OLED (n,2m) is only related to the voltage of the data signal line data (n), and the operating current of the second light emitting device OLED (n,2m) can be adjusted by adjusting the voltage of the data signal line data (n), so that constant current driving is realized, and the influence of line resistance is avoided.
As can be seen from the above description and fig. 4, the time for the scanning signal line gate (m) connected to the m-th row of pixel circuits to output a high level corresponds to the sum of the display times of the first light emitting device (n,2m-1) and the second light emitting device OLED (n,2m) in the m-th row of pixel circuits; and when the other row (for example, the m +1 th row) is scanned, the scanning signal line Gate (m) connected to the m-th row of pixel circuits is pulled down to a low level, and the scanning signal line (for example, Gate (m +1)) connected to the other row of pixel circuits (for example, the m +1 th row) outputs a high level.
In summary, in the display panel provided in the embodiment of the present invention, not only the structure of the pixel circuit is relatively simple and the Mask design is facilitated, but also the voltage of the data signal line data (n) is adjusted, so that the magnitude of the driving current for emitting light by the light emitting device can be accurately controlled, the gray scale can be accurately adjusted, and high brightness and high resolution can be more easily achieved. Further, since the switching transistor VT independently controls each light emitting device to emit light is provided, not only 100% load driving but also the driving can be performed without being limited by the number of scanning electrodes, so that each light emitting device can be selectively adjusted independently. In addition, the first light emitting device OLED (n,2m-1) and the second light emitting device OLED (n,2m) included in each row of the pixel circuit share one scanning signal line gate (m), which is equivalent to the fact that two rows of the light emitting devices share one scanning signal line, so that the present invention can reduce the number of the wirings of the scanning signal lines and further increase the aperture ratio of the pixels, compared with the prior art that each row of the light emitting devices is correspondingly connected with one scanning signal line.
Correspondingly, an embodiment of the present invention further provides a driving method of a display panel, as shown in fig. 5, specifically including the following steps:
s501, in the first stage, a constant current control module generates a first constant current signal according to a first signal of a data signal line, and controls a corresponding first light-emitting device to emit light under the driving of the first constant current signal through a switch module conducted in a row of pixel circuits;
s502, in the second stage, the constant current control module generates a second constant current signal according to a second signal of the data signal line, and controls the corresponding second light-emitting device to emit light under the driving of the second constant current signal through the switch modules conducted in the pixel circuits in one row; the polarity of the second signal of the data signal line is opposite to that of the first signal.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, including the display panel provided in the embodiment of the present invention, where the display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital camera, a navigator, an intelligent watch, a fitness wristband, a personal digital assistant, a self-service deposit/withdrawal machine, and the like. Other essential components of the display device should be understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present invention. The display device can be implemented by referring to the above embodiments of the display panel, and repeated descriptions are omitted.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A pixel circuit, comprising: the constant current control module, the switch module, the first light emitting device and the second light emitting device;
the constant current control module is respectively connected with a data signal line, a first power supply end, a second power supply end, a first pole of the first light-emitting device and a second pole of the second light-emitting device, and the switch module is respectively connected with a scanning signal line, the second pole of the first light-emitting device and the first pole of the second light-emitting device;
the constant current control module is used for generating a first constant current signal according to a first signal of the data signal line and controlling the first light-emitting device to emit light under the driving of the first constant current signal through the switched-on switch module; the second light emitting device is used for generating a second constant current signal according to a second signal of the data signal line and controlling the second light emitting device to emit light under the driving of the second constant current signal through the switched-on switch module; wherein the second signal of the data signal line is opposite in polarity to the first signal.
2. The pixel circuit of claim 1, wherein the constant current control module comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and an operational amplifier;
one end of the first resistor is connected with the inverting input end of the operational amplifier, and the other end of the first resistor is grounded;
one end of the second resistor is connected with the inverting input end of the operational amplifier, and the other end of the second resistor is connected with the output end of the operational amplifier;
one end of the third resistor is connected with the data signal line, and the other end of the third resistor is connected with the non-inverting input end of the operational amplifier;
one end of the fourth resistor is connected with the non-inverting input end of the operational amplifier, and the other end of the fourth resistor is respectively connected with the first pole of the first light-emitting device and the second pole of the second light-emitting device;
one end of the fifth resistor is connected with the output end of the operational amplifier, and the other end of the fifth resistor is respectively connected with the first pole of the first light-emitting device and the second pole of the second light-emitting device;
and the first control end of the operational amplifier is connected with the first power supply end, and the second control end of the operational amplifier is connected with the second power supply end.
3. The pixel circuit according to claim 2, wherein under a condition that the resistance value of the first resistor is equal to the resistance value of the third resistor, and the resistance value of the second resistor is equal to the sum of the resistance value of the fourth resistor and the resistance value of the fifth resistor, the relationship between the first constant current signal and the resistance values of the third resistor, the fourth resistor, the fifth resistor, and the first signal of the data signal line is as follows:
wherein, I1Is the first constant current signal, r3Is the resistance value of the third resistor, r4Is the resistance value of the fourth resistor, r5Is the resistance value of the fifth resistor, VDataIs a first signal of the data signal line.
4. The pixel circuit according to claim 2, wherein under a condition that the resistance value of the first resistor is equal to the resistance value of the third resistor, and the resistance value of the second resistor is equal to the sum of the resistance value of the fourth resistor and the resistance value of the fifth resistor, the relationship between the second constant current signal and the resistance values of the third resistor, the fourth resistor, the fifth resistor, and the second signal of the data signal line is as follows:
wherein, I2Is the second constant current signal, r3Is the resistance value of the third resistor, r4Is the resistance value of the fourth resistor, r5Is the resistance value of the fifth resistor, -VDataIs a second signal of the data signal line.
5. The pixel circuit of claim 1, wherein the switching module comprises: and the grid electrode of the switch transistor is connected with the scanning signal line, the first pole of the switch transistor is grounded, and the second pole of the switch transistor is respectively connected with the second pole of the first light-emitting device and the first pole of the second light-emitting device.
6. A display panel comprising a plurality of pixel circuits arranged in an array, wherein the pixel circuits are according to any one of claims 1 to 5.
7. The display panel according to claim 6, wherein the first light emitting device and the second light emitting device in the same column of the pixel circuits share the same constant current control module; each constant current control module is connected with the data signal lines in a one-to-one correspondence manner; and the first light-emitting device and the second light-emitting device in each row of the pixel circuits are correspondingly connected with the scanning signal lines one by one through the corresponding switch modules.
8. The display panel according to claim 7, wherein the constant current control module is located in a non-display area of the display panel or integrated in a data driving circuit.
9. A driving method of the display panel according to claim 7, comprising:
in the first stage, the constant current control module generates a first constant current signal according to a first signal of a data signal line, and controls a corresponding first light-emitting device to emit light under the driving of the first constant current signal through a switch module conducted in a row of pixel circuits;
in the second stage, the constant current control module generates a second constant current signal according to a second signal of the data signal line, and controls the corresponding second light-emitting device to emit light under the driving of the second constant current signal through the switch modules conducted in the pixel circuits in one row; wherein the second signal of the data signal line is opposite in polarity to the first signal.
10. A display device characterized by comprising the display panel according to any one of claims 6 to 8.
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| CN109671397B (en) * | 2019-02-15 | 2020-08-14 | 京东方科技集团股份有限公司 | Light emitting current control circuit, pixel circuit, display device, and display driving method |
| CN111326105A (en) * | 2020-04-30 | 2020-06-23 | 汕头超声显示器技术有限公司 | LED display device capable of reducing wiring and driving mode thereof |
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