CN115050313A - Sub-pixel circuit - Google Patents
Sub-pixel circuit Download PDFInfo
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- CN115050313A CN115050313A CN202210715530.9A CN202210715530A CN115050313A CN 115050313 A CN115050313 A CN 115050313A CN 202210715530 A CN202210715530 A CN 202210715530A CN 115050313 A CN115050313 A CN 115050313A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
Abstract
The embodiment of the application discloses a sub-pixel circuit, which comprises a passive driving circuit, an internal compensation circuit and a light emitting diode; the internal compensatory circuitry comprises a first data write interface; the passive driving circuit comprises a second data writing interface and a sweep frequency signal input interface; the second data writing interface is used for writing a second data voltage, and the sweep frequency signal input interface is used for receiving a sweep frequency signal; the passive driving circuit is used for changing the voltage of a connection point of the passive driving circuit and the internal compensation type circuit according to the second data voltage and the sweep frequency signal; the internal compensation type circuit is used for switching on or cutting off a path between the first data writing interface and the light emitting diode according to the voltage of the connection point; when the path is conducted, the light emitting diode emits light under the driving of the first data voltage; when the path is cut off, the light emitting diode is extinguished. By implementing the embodiment of the application, the problems of gray scale loss and poor display of the display when the display displays low gray scale can be solved.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a sub-pixel circuit.
Background
The micron light emitting diode (Micro LED) technology is a technology for miniaturizing and matrixing Light Emitting Diodes (LEDs), and a Micro LED display has the advantages of high display brightness, short response time, low power consumption and the like, has the characteristics of self-luminescence and no need of a backlight source, is the mainstream trend of the future display technology, and has good development prospect. The Micro LED display mainly adopts an active driving design, but the situation of uneven brightness occurs when displaying low gray scales. The prior art mainly solves the problem of uneven brightness by reducing the driving voltage when displaying low gray scales, but the method can lose some gray scales, thereby causing poor display.
Disclosure of Invention
The embodiment of the application discloses a sub-pixel circuit, which can solve the problems of gray scale loss and poor display when a display displays a low gray scale.
The embodiment of the application discloses a sub-pixel circuit, which is characterized by comprising a passive driving circuit, an internal compensation circuit and a light emitting diode; the passive driving circuit is connected with the internal compensation type circuit, and the light emitting diode is connected with the internal compensation type circuit;
the internal compensatory circuitry comprises a first data write interface; the first data writing interface is used for writing a first data voltage; the passive driving circuit comprises a second data writing interface and a sweep frequency signal input interface; the second data writing interface is used for writing a second data voltage, and the sweep frequency signal input interface is used for receiving a sweep frequency signal;
the passive driving circuit is used for changing the voltage of a connection point of the passive driving circuit and the internal compensation type circuit according to the second data voltage and the frequency sweep signal;
the internal compensation circuit is used for switching on or switching off a path between the first data writing interface and the light emitting diode according to the voltage of the connection point; when the path is conducted, the light emitting diode emits light under the driving of the first data voltage; when the path is cut off, the light emitting diode is turned off.
As an optional implementation, the passive driving circuit further includes a ninth thin film transistor; a first electrode of the ninth thin film transistor is connected with the connection point, and a second electrode of the ninth thin film transistor is used for receiving the input of a power supply voltage; the grid electrode of the ninth thin film transistor is respectively connected with the second data writing interface and the sweep frequency signal input interface; the grid voltage of the ninth thin film transistor is changed under the coupling of the second data voltage and the frequency sweep signal;
the ninth thin film transistor is used for being turned off when the gate voltage is higher than the turn-on voltage of the ninth thin film transistor; when the ninth thin film transistor is turned off, the voltage of the connection point is a first voltage;
the internal compensation circuit is used for conducting a path between the first data writing interface and the light emitting diode when the voltage of the connection point is the first voltage;
the ninth thin film transistor is used for being turned on when the grid voltage is lower than the turn-on voltage of the ninth thin film transistor; when the ninth thin film transistor is turned on, the voltage of the connection point is the power supply voltage; the supply voltage is higher than the first voltage;
the internal compensation circuit is used for cutting off a path between the first data writing interface and the light emitting diode when the voltage of the connecting point is the power supply voltage.
As an optional implementation, the passive driving circuit further includes a tenth thin film transistor and a second capacitor; the second data writing interface comprises a first electrode of the tenth thin film transistor, and a second electrode of the tenth thin film transistor is connected with a grid electrode of the ninth thin film transistor; one end of the second capacitor is respectively connected with the second electrode of the tenth thin film transistor and the grid electrode of the ninth thin film transistor; the sweep signal input interface comprises the other end of the second capacitor.
As an optional implementation, the passive driving circuit further includes an eleventh thin film transistor; the internal compensation circuit further comprises a sixth thin film transistor; a first electrode of the eleventh thin film transistor is respectively connected with one end of the second capacitor and a second electrode of the tenth thin film transistor, the second electrode of the eleventh thin film transistor is connected with the first electrode of the sixth thin film transistor, and a grid electrode of the eleventh thin film transistor is connected with the grid electrode of the sixth thin film transistor; and the second electrode of the sixth thin film transistor is connected with the connection point of the passive driving circuit and the internal compensation type circuit.
As an alternative embodiment, the sub-pixel circuit is connected with a controller;
the controller is configured to input the first data voltage, the second data voltage, and the sweep signal to the subpixel circuit.
As an alternative embodiment, the controller is respectively connected with a plurality of the sub-pixel circuits;
and the controller is used for writing different second data voltages into the second data writing interfaces of the sub-pixel circuits respectively.
As an alternative embodiment, the first data writing interfaces of the respective sub-pixel circuits are connected to each other;
the controller is configured to write the first data voltage to the first data writing interface of each of the sub-pixel circuits at the same time.
As an optional implementation, the passive driving circuit further includes a twelfth thin film transistor; the first electrode of the ninth thin film transistor is also connected with the first electrode of the twelfth thin film transistor; a second electrode and a grid electrode of the twelfth thin film transistor are respectively connected with the controller;
the controller is used for cutting off a path between the passive driving circuit and the internal compensation circuit and maintaining the sweep frequency signal at a fixed level;
the controller is further configured to detect, when the light emitting diode is turned off, currents flowing through the ninth thin film transistor and the twelfth thin film transistor through the second electrode of the twelfth thin film transistor, and adjust a second data voltage written to the second data writing interface according to the currents.
As an optional implementation manner, the controller is configured to increase the second data voltage written into the second data writing interface to a voltage preset value when the current flowing through the ninth thin film transistor and the twelfth thin film transistor is smaller than a current preset value.
As an alternative embodiment, the sub-pixel circuit further includes an eighth thin film transistor; the passive driving circuit is connected with a first electrode of the eighth thin film transistor, and the internal compensation circuit is connected with a second electrode of the eighth thin film transistor; the connection point of the passive driving circuit and the internal compensation circuit comprises a connection point of the second electrode of the eighth thin film transistor and the internal compensation circuit; the grid electrode of the eighth thin film transistor is used for receiving a control signal; the eighth thin film transistor switches different switch states according to the control signal;
when the switch state of the eighth thin film transistor is an on state, a path between the passive driving circuit and the internal compensation type circuit is in a conducting state;
when the switching state of the eighth thin film transistor is an off state, a path between the passive driving circuit and the internal compensation circuit is in an off state.
Compared with the related art, the embodiment of the application has the following beneficial effects:
the embodiment of the application discloses a sub-pixel circuit, wherein a passive driving circuit of the sub-pixel circuit can change the voltage of a connection point of the passive driving circuit and an internal compensation type circuit according to a written second data voltage and an input sweep frequency signal, and the internal compensation type circuit of the sub-pixel circuit can conduct or cut off a path between a first data writing interface and a light emitting diode according to the voltage of the connection point so as to control the light emitting or the light out of the light emitting diode.
Therefore, the sub-pixel circuit provided by the embodiment of the application can switch the light emitting state of the light emitting diode according to the second data voltage and the sweep frequency signal input to the passive driving circuit by introducing the passive driving circuit, so that the sub-pixel circuit can control the light emitting duration of the light emitting diode according to different gray scale display requirements, the brightness uniformity of the display when displaying low gray scales is improved, and the problems of gray scale loss and poor display when displaying the low gray scales are solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a related art sub-pixel circuit;
FIG. 2 is a schematic structural diagram of a sub-pixel circuit according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of another sub-pixel circuit disclosed in an embodiment of the present application;
FIG. 4 is a schematic diagram of another sub-pixel circuit disclosed in the embodiments of the present application;
FIG. 5 is a schematic diagram of another sub-pixel circuit disclosed in an embodiment of the present application;
FIG. 6 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a process of changing the emission duration of a sub-pixel by a passive driving circuit according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of driving signals within a frame of a display panel according to an embodiment of the present disclosure;
FIG. 9 is a schematic diagram of driving signals within a frame of another display panel according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is to be noted that the terms "comprises" and "comprising" and any variations thereof in the examples and figures of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Referring to fig. 1, fig. 1 is a schematic diagram of a related art sub-pixel circuit. As shown in fig. 1, the sub-pixel circuit has a 7T1C structure and is an internal compensation circuit. The 7T1C structure is composed of 7 Thin Film Transistors (TFTs) and 1 storage capacitor. The sub-pixel circuit comprises a first thin film transistor 101, a second thin film transistor 102, a third thin film transistor 103, a fourth thin film transistor 104, a fifth thin film transistor 105, a sixth thin film transistor 106, a seventh thin film transistor 107, a light emitting diode 203 and a first capacitor 109.
Among them, a Thin Film Transistor (TFT) is a device of a voltage type switch. The thin film transistor comprises 3 electrodes which are respectively a source electrode, a drain electrode and a grid electrode. When the grid voltage of the thin film transistor is greater than the starting voltage of the thin film transistor, the source electrode and the drain electrode are conducted; when the gate voltage of the thin film transistor is less than the turn-on voltage of the thin film transistor, the source and the drain are cut off.
Each sub-pixel circuit comprises one light emitting diode 203, i.e. Micro LED.
Because Micro LED displays generally adopt an active driving design, colors displaying 0-255 gray scales can meet the gamma2.2 standard. The formula of gamma2.2 is:
L＝L255*(L/L255)^gamma；
wherein, L is the luminance of the sub-pixel, L255 is the gray scale value of the sub-pixel at 255-level gray scale (i.e. maximum gray scale), L is the gray scale value at i gray scale, i can be an integer in the range of 0-255; the gamma was 2.2. Gamma2.2 is the optimum value for the human eye to perceive brightness. Therefore, the color of the Micro LED displaying 255 levels of gray scales meets the light-current (LI) curve of gamma2.2, i.e. the LED chip driving current vs. luminance curve.
The main reason why the Micro LED adopting the active driving design has uneven brightness when displaying low gray scale (for example, 0-32 gray scale) is that the LI curve of the Micro LED is too steep, resulting in uneven brightness when displaying low gray scale due to uneven electrical properties of the first data voltage and the TFT device.
In the related art, in order to solve the problem of non-uniform display brightness, the data line voltage for driving the display panel to emit light is usually lowered when displaying low gray scales, and the current flowing through the TFT device is influenced to limit the passing current of the Micro LED. When the current flowing through the Micro LED becomes small, the Micro LED emits light with lower brightness, and this method of controlling the light emitting brightness by the active device may be referred to as display driving of the active device. However, since the Micro LED display is a light emitting display unit of current mode driving, unlike liquid crystal voltage mode driving, current mode control requires controlling a passing current of a TFT to control a passing current of the Micro LED. Therefore, in the case of a low gray scale, the voltage of the data line driving the display panel to emit light is relatively small and varies within a minimum unit voltage range, and thus, in this case, the brightness difference of the Micro LEDs due to the current difference is not obvious, so that some gray scales cannot be displayed and are lost.
The embodiment of the application discloses a sub-pixel circuit, which can solve the problems of gray scale loss and poor display of a Micro LED display when displaying low gray scale. The following are detailed below.
The sub-pixel circuit disclosed in the embodiment of the present application can be applied to a Micro LED display of an electronic device, wherein the electronic device may include a mobile phone, a computer, a television, and the like, but is not limited thereto. The Micro LED can be an LED chip with the size of less than 50 micrometers (mum) by 50μm, the thickness is about 7-10μm, and the Micro LED is not provided with a sapphire substrate.
Each pixel is composed of three primary colors, red, blue, green (RGB), each color on each pixel is called a sub-pixel, and illustratively, the number of sub-pixels on a Micro LED display panel with a resolution of 480 × 270 is 270 (480 × 3) ═ 388800. Each sub-pixel on the Micro LED display panel corresponds to one sub-pixel circuit.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a sub-pixel circuit according to an embodiment of the present disclosure. The sub-pixel circuit comprises a passive driving circuit 201, an internal compensation circuit 202 and a light emitting diode 203; the passive driving circuit 201 is connected with the internal compensation type circuit 202, and the light emitting diode 203 is connected with the internal compensation type circuit 202;
the internal compensatory circuitry 202 includes a first data write interface 204; the first data writing interface 204 is used for writing a first data voltage; the passive driving circuit 201 includes a second data writing interface 206 and a sweep signal input interface 205; the second data writing interface 206 is configured to write a second data voltage, and the sweep signal input interface 205 is configured to receive a sweep signal;
the passive driving circuit 201 is used for changing the voltage of a connection point 207 between the passive driving circuit 201 and the internal compensation type circuit 202 according to the second data voltage and the frequency sweep signal;
an internal compensation circuit 202 for turning on or off a path 208 between the first data write interface 204 and the light emitting diode 203 according to a voltage at a connection point 207; when the path 208 is turned on, the light emitting diode 203 emits light under the driving of the first data voltage; when the path 208 is interrupted, the light emitting diode 203 is extinguished.
The internal compensation circuit 202 may be a sub-pixel circuit as shown in fig. 1, and the circuit structure is 7T1C, which is not limited in particular.
The first data voltage and the second data voltage are data line voltages for driving the display panel to emit light, and different data line voltages correspond to different brightness of the display panel.
The first data writing interface 204 may be a circuit interface for resetting, compensating, and writing in the internal compensation circuit 202, and may be used for writing the first data voltage. Optionally, the first data writing interface 204 may also be a port of an electronic device such as a switch or a transistor, which can control when the first data voltage is written.
The first data voltage can adjust the brightness of the light emitting diode 203; the first data voltage may be 2 volts (V) to 6V, and is not particularly limited.
The light emitting diodes 203 may be Micro LEDs with dimensions of about 50 micrometers (μm) by 50 μm.
The path 208 between the first data writing interface 204 and the light emitting diode 203 may include a voltage-driven device, such as a field effect transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), and the like, without limitation, so that the on state of the path 208 may be determined according to the voltage of the connection point 207 of the passive driving circuit and the internal compensation circuit. The on state of the path 208 determines the light emitting state of the led 203.
The second data voltage may be a data line voltage for driving the display panel to emit light, and when the light emitting diode 203 emits light, the second data voltage may affect the light emitting brightness of the light emitting diode 203; the second data voltage may be 2 volts (V) to 6V, and is not particularly limited.
The frequency sweep signal may be a signal whose frequency varies linearly within a limited range, and the frequency sweep signal may be coupled with the second data voltage to obtain a variable voltage, so that the voltage output by the passive driving circuit 201 to the internal compensation circuit 202 according to the second data voltage and the frequency sweep signal is variable, and the passive driving circuit 201 may change the voltage of the connection point 207, so that the internal compensation circuit 202 controls the light emitting state of the light emitting diode 203 according to the voltage of the connection point 207. That is, the passive driving circuit 201 can indirectly control when the light emitting diode 203 emits light and when the light emitting diode 203 is turned off by changing the voltage of the connection point 207, so that the light emitting time period of the light emitting diode can be controlled.
Therefore, the sub-pixel circuit provided by the embodiment of the application can switch the light emitting state of the light emitting diode according to the second data voltage and the sweep frequency signal input to the passive driving circuit by introducing the passive driving circuit, so that the sub-pixel circuit can control the light emitting duration of the light emitting diode according to different gray scale display requirements, the brightness uniformity of the display when displaying low gray scales is improved, and the problems of gray scale loss and poor display when displaying the low gray scales are solved.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another sub-pixel circuit disclosed in the present embodiment.
The passive driving circuit 201 further includes a ninth thin film transistor 301; a first electrode of the ninth thin film transistor 301 is connected to the connection point 207, and a second electrode of the ninth thin film transistor 301 is used for receiving an input of a power supply voltage; the gate of the ninth thin film transistor 301 is connected to the second data writing interface 206 and the sweep signal input interface 205, respectively; the gate voltage of the ninth thin film transistor 301 changes under the coupling of the second data voltage and the sweep signal.
A Thin Film Transistor (TFT) is an insulated gate field effect transistor and can be classified into an n-type TFT and a p-type TFT. Each thin film transistor adopted in the embodiment of the application is a p-type TFT, and the working principle of the p-type TFT is as follows: when the grid voltage of the thin film transistor is smaller than the starting voltage of the thin film transistor, the thin film transistor is conducted; when the gate voltage of the thin film transistor is greater than the turn-on voltage of the thin film transistor, the thin film transistor is turned off. The turn-on voltage of the thin film transistor is a device parameter of the thin film transistor and is a gate voltage when the source electrode and the drain electrode of the thin film transistor are just conducted.
The first electrode and the second electrode of the ninth thin film transistor 301 may respectively represent a source electrode and a drain electrode of the ninth thin film transistor 301. In the embodiments of the present application, the first electrode and the second electrode of each thin film transistor may respectively represent a source electrode and a drain electrode of the thin film transistor. Which of the first electrode and the second electrode is a source electrode and which is a drain electrode is not particularly limited.
The second electrode of the ninth thin film transistor 301 is used for receiving an input of a power supply voltage, wherein the power supply voltage may be 3.3 volts or 5 volts, and is not limited in particular.
A ninth thin film transistor 301 for turning off when a gate voltage is higher than an on voltage of the ninth thin film transistor 301; when the ninth thin film transistor 301 is turned off, the voltage of the connection point 207 is the first voltage.
The internal compensation circuit 202 is used for conducting a path 208 between the first data writing interface 204 and the light emitting diode 203 when the voltage at the connection point 207 is the first voltage.
A ninth thin film transistor 301 for being turned on when a gate voltage is lower than a turn-on voltage of the ninth thin film transistor 301; when the ninth thin film transistor 301 is turned on, the voltage of the connection point 207 is a power supply voltage; the supply voltage is higher than the first voltage.
The gate voltage of the ninth thin film transistor 301 may be a voltage at which the second data voltage and the sweep signal are coupled, the coupled voltage may be variable, and the voltage value may gradually decrease from the second data voltage. Illustratively, the second data voltage is 4V, the voltage at which the second data voltage and the sweep signal are coupled gradually decreases from 4V, that is, the gate voltage of the ninth thin film transistor 301 gradually decreases from 4V, assuming that the turn-on voltage of the ninth thin film transistor 301 is 0.8V, when the gate voltage of the ninth thin film transistor 301 has not decreased to below the turn-on voltage, the ninth thin film transistor 301 turns off, and the voltage at the connection point 207 between the passive driving circuit 201 and the internal compensation circuit 202 is the first voltage.
The first voltage may be a low level lower than 0.5V, which is not limited in particular.
When the gate voltage of the ninth thin film transistor 301 decreases to below the turn-on voltage, the ninth thin film transistor 301 is turned on, the second electrode of the ninth thin film transistor 301 can receive the input of the power voltage, and the voltage at the connection point 207 is pulled to the same voltage as the power voltage, i.e., the voltage at the connection point 207 is the power voltage.
The power supply voltage may be a high level higher than 3V, and is not limited.
The internal compensation circuit 202 is used for cutting off a path 208 between the first data writing interface 204 and the light emitting diode 203 when the voltage of the connection point 207 is a power supply voltage.
When the voltage at the connection point 207 is the first voltage, the internal compensation circuit 202 can turn on the path 208 between the first data writing interface 204 and the led 203. Alternatively, the internal compensation circuit 202 may control the switching device on path 208 by inputting a control signal to control the conduction or cutoff of path 208, or the internal compensation circuit 202 may drive the device on path 208 by a voltage on path 208 to control the conduction or cutoff of path 208. Alternatively, the voltage driven device may be closed when the voltage at the connection point 207 is the first voltage and open when the voltage at the connection point 207 is the supply voltage.
Therefore, in the embodiment of the application, the working state of the ninth thin film transistor is switched by the passive driving circuit through the second data voltage and the sweep frequency signal, so that the internal compensation type circuit can directly and flexibly control the light emitting state of the light emitting diode according to the working state of the ninth thin film transistor, the sub-pixel circuit can control the light emitting duration of the light emitting diode according to different gray scale display requirements, the brightness uniformity of the Micro LED display is improved when displaying low gray scales, and the problems of gray scale loss and poor display when displaying the low gray scales are solved.
In some embodiments, the sub-pixel circuits are connected to the controller 303; the controller 303 is configured to input the first data voltage, the second data voltage, and the sweep signal to the sub-pixel circuit.
The controller 303 may be a Central Processing Unit (CPU) of an electronic device such as a mobile phone, a computer, a television, and the like, and is not particularly limited. The controller 303 may input the first data voltage, the second data voltage and the sweep signal to the sub-pixel circuits in the display panel of the electronic device to switch the light emitting states of the light emitting diodes in the sub-pixel circuits, so as to adjust the parameters of the display panel, such as brightness and color.
The passive driving circuit 201 further includes a twelfth thin film transistor 302; the first electrode of the ninth thin film transistor 301 is further connected to the first electrode of the twelfth thin film transistor 302; a second electrode and a gate of the twelfth thin film transistor 302 are connected to the controller 303, respectively.
The controller 303 is used for cutting off the path between the passive driving circuit 201 and the internal compensation circuit 202, and maintaining the sweep frequency signal at a fixed level.
It should be noted that the controller 303 cuts off the path between the passive driving circuit 201 and the internal compensation circuit 202, at this time, the light emitting diode 203 is turned off, and the sweep signal is maintained at the fixed level, i.e., the sweep signal does not generate the coupling effect on the second data voltage.
And the controller 303 is further configured to detect currents flowing through the ninth thin film transistor 301 and the twelfth thin film transistor 302 through the second electrode of the twelfth thin film transistor 302 when the light emitting diode 203 is turned off, and adjust the second data voltage written into the second data writing interface 206 according to the currents.
A second electrode and a gate of the twelfth thin film transistor 302 may be used to receive a control signal sent by the controller 303 to switch the switch state.
And a controller 303 for increasing the second data voltage written into the second data writing interface 206 to a voltage preset value when the current flowing through the ninth thin film transistor 301 and the twelfth thin film transistor 302 is less than a current preset value.
When the light emitting diode 203 is turned off, the controller 303 inputs a control signal to the second electrode and the gate of the twelfth thin film transistor 302, and after the twelfth thin film transistor 302 is turned on according to the control signal, the controller 303 detects currents flowing through the ninth thin film transistor 301 and the twelfth thin film transistor 302 to detect the current driving capability of the ninth thin film transistor 301. The current preset value may be a current value for ensuring that the ninth thin film transistor 301 is at an optimum current driving capability, and thus, if the current flowing through the ninth thin film transistor 301 and the twelfth thin film transistor 302 is less than the current preset value, it is indicated that the second data voltage for driving the ninth thin film transistor 301 is less than the voltage preset value, and in order to improve the driving capability of the ninth thin film transistor, the second data voltage may be increased to the voltage preset value.
Therefore, in the embodiment of the present application, in the light emitting and extinguishing processes of the light emitting diode 203, the ninth thin film transistor 301 may generate voltage losses such as driving loss and conduction loss due to switching of the operating state and current change, so that by introducing the twelfth thin film transistor 302, the current driving capability of the ninth thin film transistor 301 is detected each time the light emitting diode 203 is extinguished, and the second data voltage written into the second data writing interface 206 is fed back and compensated, so that the stability of the sub-pixel circuit can be effectively improved.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another sub-pixel circuit disclosed in the present embodiment.
The sub-pixel circuit further includes an eighth thin film transistor 401; the passive driving circuit 201 is connected with a first electrode of the eighth thin film transistor 401, and the internal compensation circuit 202 is connected with a second electrode of the eighth thin film transistor 401; the connection point of the passive driving circuit 201 and the internal compensation circuit 202 includes the connection point of the second electrode of the eighth thin film transistor 401 and the internal compensation circuit 202; a gate of the eighth thin film transistor 401 is configured to receive a control signal; the eighth thin film transistor 401 switches different switching states according to a control signal;
when the switching state of the eighth thin film transistor 401 is an on state, a path between the passive driving circuit 201 and the internal compensation circuit 202 is in a conducting state, and the light emitting diode 203 emits light;
when the switching state of the eighth thin film transistor 401 is in an off state, the path between the passive driving circuit 201 and the internal compensation circuit 202 is in an off state, and the light emitting diode 203 is turned off.
The gate of the eighth thin film transistor 401 may be configured to receive a control signal sent by the controller to control the switching state of the eighth thin film transistor, the eighth thin film transistor 401 may be switched between an on state and an off state according to the control signal, and the light emitting diode 203 may be switched between emitting light and turning off according to the switching state of the eighth thin film transistor 401.
It should be noted that, the eighth thin film transistor 401 is in an on state, which means that a current between the first electrode and the second electrode of the eighth thin film transistor 401 can be conducted; the eighth thin film transistor 401 is in an off state, which means that no current flows between the first electrode and the second electrode of the eighth thin film transistor 401.
The eighth thin film transistor 401 and the ninth thin film transistor 301 may control light emission or light extinction of the light emitting diode in common. When the eighth thin film transistor 401 is in an on state and the ninth thin film transistor 301 is in an off state, the light emitting diode 203 emits light; when the eighth thin film transistor 401 is in an on state and the ninth thin film transistor 301 is also in an on state, the light emitting diode 203 is turned off.
Therefore, the light emitting process of the led 203 is as follows: the eighth tft 401 is turned on, the gate voltage of the ninth tft 301 is higher than the turn-on voltage by the second data voltage, so that the ninth tft 301 is turned off, the voltage at the connection point 207 between the passive driving circuit 201 and the internal compensation circuit 202 is the first voltage, the path 208 is turned on, and the led 203 starts emitting light; the second data voltage is coupled with the sweep signal, so that the gate voltage of the ninth thin film transistor 301 continuously decreases, when the gate voltage of the ninth thin film transistor 301 is lower than the turn-on voltage, the ninth thin film transistor 301 is turned on, the voltage of the connection point 207 between the passive driving circuit 201 and the internal compensation circuit 202 is pulled to the same voltage as the power supply voltage, that is, the voltage of the connection point 207 is the power supply voltage, the path 208 is cut off, and the light emitting diode 203 is turned off.
Therefore, the eighth tft 401 acts as a master switch, determines the conduction state between the passive driving circuit 201 and the internal compensation circuit 202, and determines whether the led 203 can emit light; on the premise that the eighth tft 401 is in an on state, the ninth tft 301 is used to control the light emitting duration of the led 203, and determine when the led 203 is turned off.
The passive driving circuit 201 further includes a tenth thin film transistor 402 and a second capacitor 403; the second data writing interface 206 includes a first electrode of the tenth thin film transistor 402, and a second electrode of the tenth thin film transistor 402 is connected to the gate of the ninth thin film transistor 301; one end of the second capacitor 403 is connected to the second electrode of the tenth thin film transistor 402 and the gate of the ninth thin film transistor 301, respectively; the swept frequency signal input interface 205 comprises the other end of the second capacitance 403.
In the embodiment of the present application, the second data writing interface 206 includes a first electrode of the tenth thin film transistor 402, and the first electrode of the tenth thin film transistor 402 may be used for receiving the written second data voltage. The gate of the tenth tft 402 may be used for receiving a control signal input by the controller, and the tenth tft 402 switches the switch state according to the control signal. The tenth thin film transistor 402 may control when to receive the written second data voltage based on a different switching state.
The other end of the second capacitor 403 may be used for receiving the input frequency sweep signal, and the second capacitor 403 may be used for storing the frequency sweep signal.
The passive driving circuit 201 further includes an eleventh thin film transistor 404; the internal compensation circuit 202 further includes a sixth thin film transistor 106; a first electrode of the eleventh thin film transistor 404 is connected to one end of the second capacitor 403 and a second electrode of the tenth thin film transistor 402, respectively, a second electrode of the eleventh thin film transistor 404 is connected to a first electrode of the sixth thin film transistor 106, and a gate electrode of the eleventh thin film transistor 404 is connected to a gate electrode of the sixth thin film transistor 106; the second electrode of the sixth thin film transistor 106 is connected to the connection point of the passive driving circuit 201 and the internal compensation circuit 202.
The path connected between the eleventh tft 404 and the sixth tft 106 allows a current path to be added between the passive driving circuit 201 and the internal compensation circuit 202, when the eighth tft 401 is turned on and the ninth tft 201 is turned off, the internal compensation circuit 202 can receive the current from the passive driving circuit 201, and the brightness of the led 203 is not only affected by the first data voltage but also affected by the second data voltage.
Therefore, the embodiment of the application can drive the light emitting diode to emit light through the internal compensation type circuit and the passive driving circuit when the display panel displays the low gray scale, change the light emitting brightness of the light emitting diode through the internal compensation type circuit and change the light emitting duration of the light emitting diode through the passive driving circuit, thereby improving the brightness uniformity of the Micro LED display when the low gray scale is displayed and simultaneously solving the problems of gray scale loss and poor display when the low gray scale is displayed.
Referring to fig. 5, fig. 5 is a schematic structural diagram of another sub-pixel circuit according to an embodiment of the present disclosure. The sub-pixel circuit is of a 12T2C structure and comprises 12 thin film transistors and 2 capacitors. Each thin film transistor in fig. 5 is a p-type TFT. As can be seen, the path 208 between the first data writing interface 204 and the light emitting diode 203 may include the third thin film transistor 103 and the fifth thin film transistor 105.
When the eighth thin film transistor 401 and the fifth thin film transistor 105 are both in an on state and the ninth thin film transistor 301 is turned off, the light emitting diode 203 starts emitting light. The gate of the fifth thin film transistor 105 receives the enable signal sent by the controller, the fifth thin film transistor switches the switch state according to the enable signal, and when the enable signal enables the gate voltage of the fifth thin film transistor to be lower than the turn-on voltage, the fifth thin film transistor is turned on.
When the gate voltage of the ninth thin film transistor 301 changes to be lower than the turn-on voltage of the ninth thin film transistor 301 under the coupling effect of the second data voltage and the sweep signal, the ninth thin film transistor 301 is turned on, and at this time, the connection point 207 between the passive driving circuit 201 and the internal compensation circuit 202 is pulled to be the same as the power supply voltage, that is, the voltage at the connection point 207 is the power supply voltage, and the connection point 207 is connected to the gate of the third thin film transistor 103, so that the gate voltage of the third thin film transistor 103 is also the power supply voltage, the third thin film transistor 103 is in a turn-off state, no current passes through, and the light emitting diode 203 does not emit light.
The first electrode of the first thin film transistor 101 is connected to the first data writing interface, and the first thin film transistor 101 can control when the first data voltage is written to the first data writing interface.
The gates of the first thin film transistor 101, the second thin film transistor 102, the fourth thin film transistor 104, the fifth thin film transistor 105, the sixth thin film transistor 106, the seventh thin film transistor 107, the eighth thin film transistor 401, the tenth thin film transistor 402, the eleventh thin film transistor 404, and the twelfth thin film transistor 302 may be connected to the controller 303, and the switching states of the thin film transistors may be determined according to control signals sent by the controller 303 to the respective thin film transistors. For example, the control signal may include, but is not limited to, a first enable signal, a second enable signal, an enable signal, a first detection control signal, a second detection control signal, and the like.
As an alternative embodiment, the gates of the first thin film transistor 101, the fourth thin film transistor 104 and the tenth thin film transistor 402 may be used to receive the same first turn-on signal sent by the controller 303; the gates of the sixth thin film transistor 106, the seventh thin film transistor 107 and the eleventh thin film transistor 404 may be configured to receive the same second turn-on signal sent by the controller 303; the gates of the second thin film transistor 102 and the fifth thin film transistor 105 may be used to receive the same enable signal sent by the controller 303; a gate of the eighth thin film transistor 401 may be used to receive a control signal; a second electrode of the twelfth tft 302 may be configured to receive the first detection control signal sent by the controller 303, and a gate of the twelfth tft 302 may be configured to receive the second detection control signal sent by the controller 303.
As shown in fig. 6, fig. 6 is a schematic structural diagram of a display panel disclosed in the embodiment of the present application. The display panel is a 480 × 270 resolution micro led panel, and the number of sub-pixels 60 is 388800, wherein the sub-pixels 60 have 270 rows and 1440 columns in total. Each sub-pixel 60 corresponds to a sub-pixel circuit. The sub-pixel circuit may be any one of the sub-pixel circuits shown in fig. 2 to 5. D1, D2, D3 … … D1438, D1439 and D1440 respectively represent each column of sub-pixel circuits, the first data writing interfaces 204 in the sub-pixel circuits of each row may share a trace, the second data writing interfaces 206 in the sub-pixel circuits of each row may share a trace, and the gates of the first thin film transistor 101, the fourth thin film transistor 104 and the tenth thin film transistor 402 for receiving the first turn-on signal in the sub-pixel circuits of each row may share a trace. G (1), G (2), G (3) … … G (268), G (269), G (270) respectively represent the first turn-on signals respectively received by each row of sub-pixel circuits in the display panel, and the gates of the first thin film transistor 101, the fourth thin film transistor 104, and the tenth thin film transistor 402 in each row of sub-pixel circuits can be used to commonly receive the same first turn-on signal due to the common routing. That is, in each row of sub-pixel circuits, the first thin film transistor 101 and the tenth thin film transistor 402 are switched to the on state by the same first turn-on signal, so that the controller 303 can write the first data voltage to the first thin film transistor 101 and write the second data voltage to the tenth thin film transistor 402 at the same timing.
As shown in fig. 7, fig. 7 is a schematic diagram of a process of changing the emitting time of the sub-pixel by the passive driving circuit according to the embodiment of the present application.
In some embodiments, the controller 303 is connected to a plurality of sub-pixel circuits, respectively; a controller 303 for writing different second data voltages to the second data writing interfaces 206 of the respective sub-pixel circuits, respectively. The sub-pixel circuit may be any one of the sub-pixel circuits shown in fig. 2 to 5.
The passive driving circuit 201 starts to operate when the eighth tft 401 is turned on, and when the controller 303 writes different second data voltages, such as 4 volts, 5 volts, and 6 volts, to the second data writing interface 206 of each sub-pixel circuit, respectively, since the turn-on voltages of the ninth tft 301 in each sub-pixel circuit are the same, the time points at which the gate voltage of the ninth tft 301 in each sub-pixel circuit falls from the second data voltage to the turn-on voltage or below under the coupling action of the sweep signal are different, that is, the time points at which the ninth tft 301 is turned off are different, and thus the time points at which the current through the light emitting diode 203 is cut off are different, that is, the time points at which the light emitting diode 203 is turned off are different. Therefore, the light emitting duration of each sub-pixel circuit can be controlled, the light emitting duration of the light emitting diode can be controlled by the sub-pixel circuits according to different gray scale display requirements, the brightness uniformity of the display when displaying low gray scales is improved, and the problems of gray scale loss and poor display when displaying the low gray scales are solved.
Referring to fig. 8, fig. 8 is a schematic diagram of driving signals within a frame of a display panel according to an embodiment of the present disclosure.
For example, the time for the display panel to display one frame may be 1/60 seconds. In one frame, each sub-pixel circuit can include three stages, which are respectively a "reset + compensation + data write" stage, a "light-emitting" stage, and an "outer detection" stage. As shown in fig. 8, G (1) to G (270) may represent the first turn-on signals respectively received by each row of sub-pixel circuits in the display panel.
In the "reset + compensation + data write" phase, G (1) -G (270) are the first voltage (low level) according to the sequence, for each row of sub-pixel circuits in the display panel, if the first turn-on signal is the first voltage, the first thin film transistor 101 and the tenth thin film transistor 402 in the sub-pixel circuit of the row are turned on, and the controller can write the first data voltage into the first data write interface 204 and write the second data voltage into the second data write interface 206.
During the whole "reset + compensation + data writing" phase, the enable signal EM and the Control signal Control input by the controller to each sub-pixel circuit are at a high level, which means that the second thin film transistor 102, the fifth thin film transistor 105, and the eighth thin film transistor 401 are turned off.
Data1_ 1-Data 1_270 represent first Data voltages for input to the first Data write interface 204. Data2_1 to Data2_270 represent second Data voltages for input to the second Data write interface 206. During the "light-emitting" phase, the sweep signal sweep is gradually decreased and coupled to the second data voltage to affect the on-off state of the ninth thin film transistor 301 in each sub-pixel circuit.
G _ det (1-270) is a first detection control signal sent by the controller 303 to the second electrode of the twelfth TFT 302, and V _ det (1-270) is a second detection control signal sent by the controller 303 to the gate of the twelfth TFT 302. The twelfth TFT 302 is required for each sub-pixel circuit to detect the current driving capability of the ninth TFT 301. As shown in fig. 8, in the "outer detection" stage before the end of one frame, the enable signal EM and the Control signal Control are the power voltages (high level), that is, the fifth tft 105 and the eighth tft 401 are both in the off state, the Sweep signal Sweep maintains the fixed level, the first detection Control signal G _ det and the second detection Control signal V _ det are at the first voltage (low level), and the twelfth tft 302 is turned on. The Sweep signal Sweep is maintained at a constant level as shown in the Sweep signal Sweep during the "outer detection" stage of fig. 8.
During one frame time, when the twelfth tft 302 is turned on, the controller 303 may select one row of sub-pixel circuits from the 270 rows of sub-pixel circuits for detecting the current driving capability of the ninth tft 301. The controller 303 selects different rows of sub-pixel circuits per frame and may traverse each row of sub-pixel circuits after 270 frames. The controller 303 may randomly select a row of sub-pixel circuits at a time, but the selected sub-pixel circuits are different for each frame within 270 frames, or the controller 303 may select them sequentially.
That is, the controller 303 randomly selects a set of the second Data voltage and the first turn-on voltage from the Data2 (1-270) and G (1-270), for example, the second Data voltage corresponding to the sub-pixel circuit to be detected is Data2_1, the first turn-on voltage is G (1), after the twelfth tft 302 is turned on, the first turn-on voltage G (1) is low, the tenth tft 402 is in a turn-on state, the controller inputs the second Data voltage Data2_1 to the second Data writing interface 206, and at this time, the detection current flows to the external controller 303 through the ninth tft 301 and the twelfth tft 302 to detect the current driving capability, and the corresponding current is changed and fed back to the voltage value of the second Data voltage Data2_ 351. For example, if the detection current is smaller than the predetermined current value, i.e., the driving capability of the ninth tft 301 is insufficient, the voltage value of the second Data voltage Data2_1 needs to be increased to the predetermined voltage value.
Referring to fig. 9, fig. 9 is a schematic diagram of driving signals in a frame of another display panel according to an embodiment of the present disclosure.
In some embodiments, the first data write interfaces 204 of the respective sub-pixel circuits are connected to each other; a controller 303 for simultaneously writing the first data voltages to the first data writing interfaces 204 of the respective sub-pixel circuits. The sub-pixel circuit may be any one of the sub-pixel circuits shown in fig. 2 to 5.
G1_ 1-G1 _270 are first turn-on signals received by the gate of the first thin film transistor 101 of the internal compensation circuit 202 in each row of sub-pixel circuits, and G2_ 1-G2 _270 are first turn-on signals received by the gate of the tenth thin film transistor 402 and the gate of the fourth thin film transistor 104 of the passive driving circuit 201 in each row of sub-pixel circuits.
In some alternative embodiments, the G1_ 1-G1 _270 traces are all merged, and the Data1_ 1-Data 1_270 traces are all merged, i.e., the first Data writing interfaces 204 of the internal compensation type circuits 202 in the respective sub-pixel circuits are connected to each other, and the gates of the first thin film transistors 101 in the respective internal compensation type circuits 202 are connected to each other. Therefore, the internal compensation circuit 202 can achieve global light emission, at the beginning of a frame, the controller 303 performs global reset, compensation, and data write on the internal compensation circuit 202, that is, the controller 303 writes the same first data voltage to each first data write interface 204 at the same time, and then independently controls the light emitting duration of each sub-pixel in each row of sub-pixel circuits of the display panel, that is, the light emitting duration of each light emitting diode through the passive driving circuit 201, so as to achieve the effects of simplifying the circuit layout and the driving design.
As shown in fig. 9, the G1_1 to G1_270 traces are all merged, the Data1_1 to Data1_270 traces are all merged, in the "reset + compensation + Data write" phase, the first thin film transistors 101 of the internal compensation circuit 202 are simultaneously turned on, and the controller 303 simultaneously writes the same first Data voltage to each of the first Data write interfaces 204, thereby adjusting the overall brightness of the display panel. The G2_1 to G2_270 are independent in routing, and the Data2_1 to Data2_270 are independent in routing, that is, the controller still writes different second Data voltages into the second Data writing interfaces 206 of the passive driving circuit 201 in each row of the sub-pixel circuits according to the sequential time sequence, so that the light emitting duration of each row of the sub-pixels can be controlled to be different.
In the conventional general design, timing differences exist between G1_1 to G1_270 and between Data1_1 to Data1_270, so the driving design is complicated; therefore, global light emission can be realized through the internal compensation type circuit 202 by integrating the G1_ 1-G1 _270 routing and integrating the Data1_ 1-Data 1_270 routing, the driving design can be simplified, and the efficiency of global internal compensation can be improved at the beginning of a frame, so the layout design space can be increased through routing combination and driving simplification, the flexibility of circuit layout design and driving design is improved, the chip design can be simplified, and the cost is reduced. On the basis of ensuring that the internal compensation circuit 202 drives each sub-pixel circuit to realize global light emitting, the passive driving circuit 201 is utilized to adjust the light emitting duration of each sub-pixel circuit, so that the problem of uneven brightness is solved, and the problems of gray scale loss and poor display of a Micro LED display when displaying low gray scale are solved.
In other optional embodiments, the controller may use different first data voltages for different gray-scale values, for example, divide the gray-scale values into three gray-scale value intervals, where the three gray-scale value intervals are 0 to 32, 32 to 128, and 128 to 255, and use different first data voltages for different gray-scale value intervals, so that global light emission with different luminances may be achieved. For example, a higher first data voltage is used in a low gray scale, a lower first data voltage is used in a high gray scale, different light emitting durations of the sub-pixel circuits are adjusted by coupling of the sweep signal and the second data voltage in the passive driving circuit 201, and the method that the sub-pixel circuits correspond to different second data voltages is designed and matched by corresponding to different first data voltages in different gray scale value intervals, so that different light emitting luminances of the sub-pixels in different gray scale value intervals and different light emitting durations of the sub-pixels can be realized, and the problem of uniformity of luminescence of the micro led can be combined and improved.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Those skilled in the art should also appreciate that the embodiments described in this specification are all alternative embodiments and that the acts and modules involved are not necessarily required for this application.
In various embodiments of the present application, it should be understood that the size of the serial number of each process described above does not mean that the execution sequence is necessarily sequential, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated units, if implemented as software functional units and sold or used as a stand-alone product, may be stored in a computer accessible memory. Based on such understanding, the technical solution of the present application, which is a part of or contributes to the prior art in essence, or all or part of the technical solution, may be embodied in the form of a software product, stored in a memory, including several requests for causing a computer device (which may be a personal computer, a server, a network device, or the like, and may specifically be a processor in the computer device) to execute part or all of the steps of the above-described method of the embodiments of the present application.
It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by hardware instructions of a program, and the program may be stored in a computer-readable storage medium, where the storage medium includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM), or other Memory, such as a magnetic disk, or a combination thereof, A tape memory, or any other medium readable by a computer that can be used to carry or store data.
The sub-pixel circuit disclosed in the embodiments of the present application is described in detail above, and the principles and embodiments of the present application are explained herein using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present application. Meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. The sub-pixel circuit is characterized by comprising a passive driving circuit, an internal compensation circuit and a light emitting diode; the passive driving circuit is connected with the internal compensation type circuit, and the light emitting diode is connected with the internal compensation type circuit;
the internal compensatory circuitry comprises a first data write interface; the first data writing interface is used for writing a first data voltage; the passive driving circuit comprises a second data writing interface and a sweep frequency signal input interface; the second data writing interface is used for writing a second data voltage, and the sweep frequency signal input interface is used for receiving a sweep frequency signal;
the passive driving circuit is used for changing the voltage of a connection point of the passive driving circuit and the internal compensation type circuit according to the second data voltage and the frequency sweep signal;
the internal compensation circuit is used for switching on or switching off a path between the first data writing interface and the light emitting diode according to the voltage of the connection point; when the path is conducted, the light emitting diode emits light under the driving of the first data voltage; when the path is cut off, the light emitting diode is turned off.
2. The sub-pixel circuit of claim 1, wherein the passive driving circuit further comprises a ninth thin film transistor; a first electrode of the ninth thin film transistor is connected with the connection point, and a second electrode of the ninth thin film transistor is used for receiving the input of a power supply voltage; the grid electrode of the ninth thin film transistor is respectively connected with the second data writing interface and the sweep frequency signal input interface; the grid voltage of the ninth thin film transistor is changed under the coupling of the second data voltage and the frequency sweep signal;
the ninth thin film transistor is used for being turned off when the gate voltage is higher than the turn-on voltage of the ninth thin film transistor; when the ninth thin film transistor is turned off, the voltage of the connection point is a first voltage;
the internal compensation circuit is used for conducting a path between the first data writing interface and the light emitting diode when the voltage of the connection point is the first voltage;
the ninth thin film transistor is used for being turned on when the grid voltage is lower than the turn-on voltage of the ninth thin film transistor; when the ninth thin film transistor is turned on, the voltage of the connection point is the power supply voltage; the supply voltage is higher than the first voltage;
the internal compensation circuit is used for cutting off a path between the first data writing interface and the light emitting diode when the voltage of the connecting point is the power supply voltage.
3. The sub-pixel circuit of claim 2, wherein the passive driving circuit further comprises a tenth thin film transistor and a second capacitor; the second data writing interface comprises a first electrode of the tenth thin film transistor, and a second electrode of the tenth thin film transistor is connected with a grid electrode of the ninth thin film transistor; one end of the second capacitor is respectively connected with the second electrode of the tenth thin film transistor and the grid electrode of the ninth thin film transistor; the sweep signal input interface comprises the other end of the second capacitor.
4. The sub-pixel circuit of claim 3, wherein the passive drive circuit further comprises an eleventh thin film transistor; the internal compensation circuit further comprises a sixth thin film transistor; a first electrode of the eleventh thin film transistor is respectively connected with one end of the second capacitor and a second electrode of the tenth thin film transistor, the second electrode of the eleventh thin film transistor is connected with the first electrode of the sixth thin film transistor, and a grid electrode of the eleventh thin film transistor is connected with the grid electrode of the sixth thin film transistor; and the second electrode of the sixth thin film transistor is connected with the connection point of the passive driving circuit and the internal compensation type circuit.
5. The sub-pixel circuit of claim 1, wherein the sub-pixel circuit is connected to a controller;
the controller is configured to input the first data voltage, the second data voltage, and the sweep signal to the subpixel circuit.
6. The sub-pixel circuit according to claim 5, wherein the controller is connected to a plurality of the sub-pixel circuits, respectively;
and the controller is used for writing different second data voltages into the second data writing interfaces of the sub-pixel circuits respectively.
7. The sub-pixel circuit according to claim 5, wherein the first data writing interfaces of the respective sub-pixel circuits are connected to each other;
the controller is configured to write the first data voltage to the first data writing interface of each of the sub-pixel circuits at the same time.
8. The sub-pixel circuit of claim 5, wherein the passive driving circuit further comprises a twelfth thin film transistor; the first electrode of the ninth thin film transistor is also connected with the first electrode of the twelfth thin film transistor; a second electrode and a grid electrode of the twelfth thin film transistor are respectively connected with the controller;
the controller is used for cutting off a path between the passive driving circuit and the internal compensation circuit and maintaining the sweep frequency signal at a fixed level;
the controller is further configured to detect, when the light emitting diode is turned off, currents flowing through the ninth thin film transistor and the twelfth thin film transistor through the second electrode of the twelfth thin film transistor, and adjust a second data voltage written to the second data writing interface according to the currents.
9. The sub-pixel circuit of claim 8, wherein:
the controller is configured to increase a second data voltage written to the second data writing interface to a voltage preset value when a current flowing through the ninth thin film transistor and the twelfth thin film transistor is less than a current preset value.
10. The sub-pixel circuit of claim 1, further comprising an eighth thin film transistor; the passive driving circuit is connected with a first electrode of the eighth thin film transistor, and the internal compensation circuit is connected with a second electrode of the eighth thin film transistor; the connection point of the passive driving circuit and the internal compensation type circuit comprises a connection point of the second electrode of the eighth thin film transistor and the internal compensation type circuit; the grid electrode of the eighth thin film transistor is used for receiving a control signal; the eighth thin film transistor switches different switch states according to the control signal;
when the switch state of the eighth thin film transistor is an on state, a path between the passive driving circuit and the internal compensation type circuit is in a conducting state;
when the switching state of the eighth thin film transistor is an off state, a path between the passive driving circuit and the internal compensation circuit is in an off state.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210715530.9A CN115050313A (en) | 2022-06-22 | 2022-06-22 | Sub-pixel circuit |
| PCT/CN2022/140930 WO2023246039A1 (en) | 2022-06-22 | 2022-12-22 | Sub-pixel circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210715530.9A CN115050313A (en) | 2022-06-22 | 2022-06-22 | Sub-pixel circuit |
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| CN115050313A true CN115050313A (en) | 2022-09-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210715530.9A Pending CN115050313A (en) | 2022-06-22 | 2022-06-22 | Sub-pixel circuit |
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| CN (1) | CN115050313A (en) |
| WO (1) | WO2023246039A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116543691A (en) * | 2023-05-19 | 2023-08-04 | 华南理工大学 | Gate driving circuit, active electroluminescent display and driving method |
| WO2023246039A1 (en) * | 2022-06-22 | 2023-12-28 | 上海闻泰电子科技有限公司 | Sub-pixel circuit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110634433A (en) * | 2018-06-01 | 2019-12-31 | 三星电子株式会社 | Display panel |
| KR102538488B1 (en) * | 2018-10-04 | 2023-06-01 | 삼성전자주식회사 | Display panel and driving method of the display panel |
| EP3754639B1 (en) * | 2019-06-17 | 2023-09-27 | Samsung Electronics Co., Ltd. | Display module and driving method thereof |
| CN114566115A (en) * | 2022-02-21 | 2022-05-31 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit and display panel |
| CN115050313A (en) * | 2022-06-22 | 2022-09-13 | 上海闻泰信息技术有限公司 | Sub-pixel circuit |
-
2022
- 2022-06-22 CN CN202210715530.9A patent/CN115050313A/en active Pending
- 2022-12-22 WO PCT/CN2022/140930 patent/WO2023246039A1/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023246039A1 (en) * | 2022-06-22 | 2023-12-28 | 上海闻泰电子科技有限公司 | Sub-pixel circuit |
| CN116543691A (en) * | 2023-05-19 | 2023-08-04 | 华南理工大学 | Gate driving circuit, active electroluminescent display and driving method |
| CN116543691B (en) * | 2023-05-19 | 2024-04-02 | 华南理工大学 | Gate driving circuit, active electroluminescent display and driving method |
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| WO2023246039A1 (en) | 2023-12-28 |
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