CN116631335A - Display driving circuit, driving method, display panel and readable storage medium - Google Patents

Display driving circuit, driving method, display panel and readable storage medium Download PDF

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Publication number
CN116631335A
CN116631335A CN202310596864.3A CN202310596864A CN116631335A CN 116631335 A CN116631335 A CN 116631335A CN 202310596864 A CN202310596864 A CN 202310596864A CN 116631335 A CN116631335 A CN 116631335A
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China
Prior art keywords
pixel unit
data frame
stage
light
voltage
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CN202310596864.3A
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CN116631335B (en
Inventor
邱彬
谢俊烽
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HKC Co Ltd
Chongqing HKC Optoelectronics Technology Co Ltd
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HKC Co Ltd
Chongqing HKC Optoelectronics Technology Co Ltd
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Priority to CN202310596864.3A priority Critical patent/CN116631335B/en
Priority claimed from CN202310596864.3A external-priority patent/CN116631335B/en
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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]
    • G09G3/3216—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 a passive matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention discloses a display driving circuit, a driving method, a display panel and a readable storage medium, which relate to the technical field of display, and divide a pixel unit into a charge-discharge circuit and a light-emitting circuit, and when the pixel unit is currently in a discharge stage or a charge stage, the charge-discharge circuit is turned on, and the light-emitting circuit is turned off, so that unnecessary consumption of driving current and loss of components in the light-emitting circuit caused by the driving current caused by the fact that the driving current flowing at the moment passes through the components in the light-emitting circuit are avoided; when the light emitting device is in the light emitting stage, the light emitting circuit is turned on to normally drive the pixel units to emit light, so that the power consumption of the PMOLED is reduced and the loss of components associated with the light emitting stage is reduced on the premise that the pixel modules in the PMOLED can normally emit light, and the application field of the PMOLED is widened.

Description

Display driving circuit, driving method, display panel and readable storage medium
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display driving circuit, a driving method, a display panel, and a readable storage medium.
Background
Compared with LCD, PMOLED (Passive matrix OLED) has the advantages of no backlight source, high contrast ratio, self-luminescence, quick response, wide visual angle, simple structure, and the like, and is considered as the next generation display technology.
However, when the existing pixel unit corresponding to the PMOLED is driven, the current in the corresponding charging stage of the driving phase charges the capacitor to provide the driving current for the OLED (Organic Light-Emitting Diode), and the current also flows through other paths, such as an equivalent resistor and the OLED, so that the power consumption of the PMOLED is increased, the loss of the OLED is accelerated, and the PMOLED can only produce products with small size and low resolution, so that the application field of the PMOLED is limited.
Disclosure of Invention
The main purpose of the invention is to provide a display driving circuit, a driving method, a display panel and a readable storage medium, which aim to solve the technical problems that the existing PMOLED can only be used for manufacturing products with small size and low resolution, and the application field of the PMOLED is limited.
In order to achieve the above object, the present invention provides a display driving circuit including: the device comprises a data driving module, a scanning driving module and a pixel module which is respectively connected with the data driving module and the scanning driving module, wherein the pixel module comprises a plurality of pixel units, and the device is characterized in that the pixel units comprise:
The charging and discharging circuit is used for discharging the data voltage of the previous data frame in the pixel unit and charging the data voltage of the pixel unit to the preset data voltage of the current data frame;
the light-emitting circuit is connected with the charge-discharge circuit, the driving end of the light-emitting circuit is connected to the scanning line of the scanning driving module, and the light-emitting circuit is used for driving light emission according to the data voltage of the accessed current data frame.
Optionally, the charge-discharge circuit includes: the first thin film transistor, the first capacitor and the first resistor;
the input end of the first thin film transistor is connected with the first end of the first capacitor, the output end of the first thin film transistor is grounded, and the control end of the first thin film transistor is used for receiving a first control signal;
the first end of the first resistor is connected with the power end, and the second end of the first resistor is connected with the second end of the first capacitor.
Optionally, the light emitting circuit includes: a second thin film transistor, a third thin film transistor, an organic light emitting diode, and a second resistor;
The input end of the second thin film transistor is connected to the first end of the first capacitor, the output end of the second thin film transistor is connected with the positive electrode of the organic light emitting diode, and the control end of the second thin film transistor is used for receiving a second control signal;
the input end of the third thin film transistor is connected with the first end of the second resistor, the output end of the third thin film transistor is connected with the second end of the first capacitor, and the control end of the third thin film transistor is used for receiving the second control signal;
the negative electrode of the organic light-emitting diode is connected to the connection point of the second resistor and the third thin film transistor;
the second end of the second resistor is used for accessing the gating pulse of the scanning line.
The invention also provides a driving method of the display driving circuit, which comprises the following steps:
responding to a first control signal to control a pixel unit to enter a discharging stage and/or a charging stage, wherein the discharging stage and the charging stage are that a charging and discharging circuit in the pixel unit is in an on state, and a light emitting circuit in the pixel unit is in an off state;
and responding to a second control signal to control the pixel unit to enter a light-emitting stage, wherein the light-emitting stage is that the charge-discharge circuit is in a cut-off state, and the light-emitting circuit is in a conduction state.
Optionally, in a case that the refresh rate of the current data frame is detected to be higher than a preset refresh rate and the jump voltage between the current data frame and the previous data frame is detected to be higher than a preset jump voltage, the step of responding to the first control signal to control the pixel unit to enter the discharging phase and/or the charging phase includes:
controlling the pixel unit to enter a discharge phase in response to the first control signal so as to discharge the data voltage of the previous data frame in the discharge phase;
and when the data voltage of the previous data frame is completely discharged, responding to the first control signal, and controlling the pixel unit to enter a charging stage so as to charge the pixel unit in the charging stage.
Optionally, the step of controlling the pixel unit to enter the light emitting stage in response to the second control signal includes:
when the data voltage of the pixel unit is charged to the preset data voltage of the current data frame, the pixel unit is controlled to enter a light-emitting stage in response to a second control signal, so that the pixel unit is driven to emit light in the light-emitting stage.
Optionally, in a case that the refresh rate of the current data frame is detected to be lower than a preset refresh rate and the jump voltage between the current data frame and the previous data frame is detected to be lower than a preset jump voltage, the step of responding to the first control signal to control the pixel unit to enter the discharging phase and/or the charging phase includes:
When the data voltage of the current data frame is detected to be higher than the data voltage of the previous data frame, the pixel unit is controlled to enter a charging stage in response to the first control signal, so that the data voltage of the pixel unit is charged to the preset data voltage of the current data frame in the charging stage.
Optionally, in a case that the refresh rate of the current data frame is detected to be lower than a preset refresh rate and the jump voltage between the current data frame and the previous data frame is detected to be lower than a preset jump voltage, the step of responding to the first control signal to control the pixel unit to enter the discharging phase and/or the charging phase includes:
when the data voltage of the current data frame is lower than the data voltage of the previous data frame, the pixel unit is controlled to enter a discharge stage in response to the first control signal so as to discharge the data voltage of the previous data frame in the discharge stage;
when the data voltage of the previous data frame is discharged to a preset voltage level, the pixel unit is controlled to enter a charging stage in response to the first control signal, so that the data voltage of the pixel unit is charged to the preset data voltage of the current data frame in the charging stage.
In addition, in order to achieve the above object, the present invention also provides a display panel, including a memory, a processor, and a computer processing program stored in the memory and capable of running on the processor, wherein the processor implements the steps of the driving method of the display driving circuit when executing the computer processing program.
In addition, in order to achieve the above object, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which when executed by a processor, implements the steps of the driving method of the display driving circuit.
According to the invention, the pixel unit is controlled to enter a discharging stage and/or a charging stage in response to a first control signal, wherein the discharging stage and the charging stage are that a first thin film transistor in the pixel unit is in an on state, a second thin film transistor and a third thin film transistor in the pixel unit are in an off state, and the pixel unit is controlled to enter a light emitting stage in response to a second control signal, wherein the light emitting stage is that the first thin film transistor is in an off state, the second thin film transistor and the third thin film transistor are in an on state, and the control signal is used for controlling the thin film transistor to divide a current flowing circuit in the discharging stage, the charging stage and the light emitting stage, so that the current does not flow through an OLED and an equivalent resistor in the charging stage, the power consumption of the PMOLED is reduced, and the loss of the OLED is reduced, so that the PMOLED is suitable for products with large size and high resolution, and the application field of the PMOLED is widened.
Drawings
FIG. 1 is a schematic diagram of a terminal structure of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a driving circuit according to the present invention;
FIG. 3 is a schematic diagram showing functional blocks of the driving circuit;
FIG. 4 is a schematic diagram of a conventional pixel unit;
FIG. 5 is a schematic diagram of gating in a frame image period corresponding to a conventional pixel unit;
FIG. 6 is a schematic diagram showing a structure of any pixel unit in the driving circuit according to the present invention;
FIG. 7 is a flow chart of a driving method of the driving circuit according to the first embodiment of the invention;
FIG. 8 is a schematic diagram showing voltage comparison between a pixel cell of the present invention and a conventional pixel cell during the same frame period;
FIG. 9 is a flow chart of a driving method of the driving circuit according to the second embodiment of the invention;
FIG. 10 is a schematic diagram illustrating the voltage increase of a pixel cell according to the present invention;
FIG. 11 is a flow chart of a driving method of a driving circuit according to a third embodiment of the invention;
fig. 12 is a schematic diagram showing the voltage increase of the pixel unit according to the present invention.
Reference numerals illustrate:
the implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, fig. 1 is a schematic diagram of a terminal structure of a hardware running environment according to an embodiment of the present invention.
In the driving method of the display driving circuit according to the embodiment of the present invention, the application carrier is a display panel, as shown in fig. 1, the display panel may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display area (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
Optionally, the display panel may further include a camera, an RF (Radio Frequency) circuit, a sensor, an audio circuit, a WiFi module, and the like. Among other sensors, such as light sensors, motion sensors, and other sensors. Specifically, the light sensor may include an ambient light sensor that may adjust the brightness of the display screen according to the brightness of ambient light, and a proximity sensor that may turn off the display screen and/or the backlight when the mobile terminal moves to the ear. As one of the motion sensors, the gravity acceleration sensor can detect the acceleration in all directions (generally three axes), and can detect the gravity and the direction when the mobile terminal is stationary, and the mobile terminal can be used for recognizing the gesture of the mobile terminal (such as horizontal and vertical screen switching, related games, magnetometer gesture calibration), vibration recognition related functions (such as pedometer and knocking), and the like; of course, the mobile terminal may also be configured with other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, and the like, which are not described herein.
It will be appreciated by those skilled in the art that the display panel structure shown in fig. 1 is not limiting of the display panel and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, a user interface module, and a computer processing program may be included in the memory 1005, which is a type of computer storage medium.
In the terminal shown in fig. 1, the network interface 1004 is mainly used for connecting to a background server and performing data communication with the background server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to call a computer processing program stored in the memory 1005 and perform the following operations:
responding to a first control signal to control a pixel unit to enter a discharging stage and/or a charging stage, wherein the discharging stage and the charging stage are that a charging and discharging circuit in the pixel unit is in an on state, and a light emitting circuit in the pixel unit is in an off state;
and responding to a second control signal to control the pixel unit to enter a light-emitting stage, wherein the light-emitting stage is that the charge-discharge circuit is in a cut-off state, and the light-emitting circuit is in a conduction state.
Further, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:
in the case that the refresh rate of the current data frame is detected to be higher than the preset refresh rate and the jump voltage between the current data frame and the previous data frame is detected to be higher than the preset jump voltage, the step of responding to the first control signal to control the pixel unit to enter the discharging stage and/or the charging stage comprises the following steps: controlling the pixel unit to enter a discharge phase in response to the first control signal so as to discharge the data voltage of the previous data frame in the discharge phase;
and when the data voltage of the previous data frame is completely discharged, responding to the first control signal, and controlling the pixel unit to enter a charging stage so as to charge the pixel unit in the charging stage.
Further, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:
a step of controlling the pixel unit to enter a light emitting stage in response to a second control signal, comprising: when the data voltage of the pixel unit is charged to the preset data voltage of the current data frame, the pixel unit is controlled to enter a light-emitting stage in response to a second control signal, so that the pixel unit is driven to emit light in the light-emitting stage.
Further, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:
in the case that the refresh rate of the current data frame is detected to be lower than the preset refresh rate and the jump voltage between the current data frame and the previous data frame is detected to be lower than the preset jump voltage, the step of responding to the first control signal to control the pixel unit to enter the discharging stage and/or the charging stage comprises the following steps: when the data voltage of the current data frame is detected to be higher than the data voltage of the previous data frame, the pixel unit is controlled to enter a charging stage in response to the first control signal, so that the data voltage of the pixel unit is charged to the preset data voltage of the current data frame in the charging stage.
Further, the processor 1001 may call a computer program stored in the memory 1005, and further perform the following operations:
in the case that the refresh rate of the current data frame is detected to be lower than the preset refresh rate and the jump voltage between the current data frame and the previous data frame is detected to be lower than the preset jump voltage, the step of responding to the first control signal to control the pixel unit to enter the discharging stage and/or the charging stage comprises the following steps: when the data voltage of the current data frame is lower than the data voltage of the previous data frame, the pixel unit is controlled to enter a discharge stage in response to the first control signal so as to discharge the data voltage of the previous data frame in the discharge stage;
When the data voltage of the previous data frame is discharged to a preset voltage level, the pixel unit is controlled to enter a charging stage in response to the first control signal, so that the data voltage of the pixel unit is charged to the preset data voltage of the current data frame in the charging stage.
Referring to fig. 2, fig. 2 is a schematic diagram of a driving circuit according to the present invention, including: the device comprises a data driving module, a scanning driving module and a pixel module which is respectively connected with the data driving module and the scanning driving module, wherein the pixel module comprises a plurality of pixel units, each pixel unit is connected with a data line of the data driving module and a scanning line of the scanning driving module, and the pixel unit comprises:
the charging and discharging circuit is connected to the data line of the data driving module, is conducted in a discharging stage and a charging stage, and is used for discharging the data voltage of the previous data frame in the pixel unit and charging the data voltage of the pixel unit to a preset data voltage of the current data frame.
The light-emitting circuit is connected with the charge-discharge circuit, the driving end of the light-emitting circuit is connected to the scanning line of the scanning driving module, and the light-emitting circuit is conducted in a light-emitting stage and used for driving light emission according to the data voltage of the accessed current data frame.
In fig. 2, 10 is a data driving module, 20 is a scan driving module, 30 is a pixel module, 40 is a pixel unit, 50 is a charge-discharge circuit, and 60 is a light-emitting circuit.
Referring to fig. 3, the display driving circuit of the present embodiment is a driving circuit of a PMOLED, in which a data driving module outputting driving Current to pixel units in an accessed pixel module through a data line, a scan driving module outputting strobe signals or non-strobe signals to pixel units in an accessed pixel module through a scan line, and a pixel module are mainly included, and further includes an MPU (Microprocessor Unit, microprocessor) interface module 70 transmitting image display data and control commands between a system controller and the driving circuit, an instruction register module 80 receiving and registering the control commands, an image storage module 90 connected to the instruction register module and buffering the image display data to be displayed, a timing control module 110 providing control signals to the scan starting module for each control command in time sequence, an oscillator 100 issuing stable pulse strobe signals and pulse non-strobe signals to the timing controller, and a DC-DC (Direct Current) converter 120 providing supply voltage VDDH to the data driving module and the scan driving module.
It should be noted that, the MPU interface module in fig. 3 may generally support an MPU parallel bus interface 130 of 8080/6800 series and an SPI (Serial Peripheral Interfac, serial peripheral interface), where the SPI includes RESB, CPU, PS, RS, RDB, WRB and DB interfaces, and the driving circuit further includes a power supply terminal VDDL and a ground terminal GND for providing a power supply to the DC-DC converter, the data driving module and the scan driving module.
As shown in fig. 4, any pixel unit corresponding to a conventional PMOLED is shown, wherein a data driver is connected to an anode of the OLED, and a scan driver is connected to a cathode of the OLED. The data driver includes driving current sources (i.e., ISEG in fig. 4) equal to pixel column data of the PMOLED panel (wherein the driving current sources are provided by Vcc), and the current magnitude of each driving current source can be adjusted from zero to a maximum value in steps according to the data signal, and the current value of each step determines the gray scale of the image, i.e., the light emitting brightness of the OLED; the scan driver generates a progressive scan voltage and sequentially gates the rows of the PMOLED.
When a row is not gated by the scan driver (i.e., near high level V on the scan driver COMH The control tube is turned on), all the OLEDs of the row are connected to a high level V at their cathodes by the scan driver COMH Reverse bias cut-off; when a row is strobed by the scan driver (i.e., near low level V on the scan driver LSS The control tube is turned on), the cathodes of all the OLEDs of the row are connected to low level V by the scan driver LSS The on-off state of the row OLED at this time depends on the data driving current outputted from the data driver to each OLED, if the data driving current is zero (i.e. the control tube in the data driver close to the driving current source ISEG is turned off), the OLED is turned off and does not emit light, if the data driving current is ISEG (i.e. the control tube in the data driver close to the driving current source ISEG is turned on), the OLED is turned onAnd emits light of corresponding brightness, wherein the reset MOS tube in the data driver is used for discharging the data driving voltage stored in the OLED parallel capacitor in the previous image period to V LSS (i.e. the control tube in the data driver remote from the drive current source ISEG is turned on).
Referring specifically to fig. 5, in one frame image period 2001, the scan driver outputs the gate pulse line by line when the output is high level V COMH The row is not strobed (non-select column 2002) when the output is low V LSS The row is then strobed (select column 2003). Each row strobe time may be divided into four periods, and when the fourth period is finished, the first period is returned to start displaying the next frame of image data, each row of pixels is sequentially and continuously lighted by taking the four periods as image periods to form an OLED image, the four periods include a reset period T1, a first precharge period T2, a second precharge period T3 and a light emitting period T4, wherein in the first precharge period and the second precharge period, although the data driver supplies driving current to the pixel unit, according to fig. 3, isolation is not set among the OLED, the equivalent resistors RD, RS and the capacitor C', so that the driving current in the two periods is consumed by charging the capacitor, and is unnecessarily consumed by the equivalent resistor and the OLED, so that the power consumption of the PMOLED is increased. Wherein the horizontal axis is time and the vertical axis is segment voltage
Based on the above-mentioned situation, the present embodiment proposes to limit the circulation path of the driving current flowing in the charging stage and the light-emitting stage of the pixel unit, specifically, divide the pixel unit into a charging and discharging circuit and a light-emitting circuit according to the driving stage (i.e. the discharging stage, the charging stage and the light-emitting stage) corresponding to the period of one frame of data frame of the pixel unit, when the pixel unit is currently in the discharging stage or the charging stage, the charging and discharging circuit is turned on, and the light-emitting circuit is turned off, so as to avoid the situation that the driving current flowing at this time passes through the components in the light-emitting circuit, thereby causing unnecessary consumption of the driving current and loss of the components in the light-emitting circuit caused by the driving current; when the pixel unit is in the light-emitting stage, the light-emitting circuit is turned on, and the pixel unit is driven to emit light normally. By isolating the components used for charging from the components used for emitting light in the pixel units, the power consumption of the PMOLED is reduced and the loss of the components associated with the light emitting stage is reduced on the premise that the pixel modules in the PMOLED can emit light normally.
Specifically, referring to fig. 6, the charge and discharge circuit includes: the first thin film transistor, the first capacitor and the first resistor;
The input end of the first thin film transistor is connected with the first end of the first capacitor, the output end of the first thin film transistor is grounded, the control end of the first thin film transistor is used for receiving a first control signal, the first end of the first resistor is connected with the power end, and the second end of the first resistor is connected with the second end of the first capacitor.
In this embodiment, as shown in fig. 6, the charge-discharge circuit includes a first thin film transistor, a first capacitor and a first resistor, where the first resistor is an equivalent resistor of a data line connected to a pixel unit corresponding to the charge-discharge circuit, and is used to reduce an electrical effect and provide a stable charge-discharge environment for a later circuit.
The control end of the first thin film transistor is conducted when receiving a first control signal, and when the power end connected with the first end of the first resistor does not output a driving power supply, the first capacitor enters a discharging state, namely the first capacitor discharges the data voltage stored in the period of the previous data frame, so that the load when the current data frame is output is reduced; when the power end connected to the first end of the first resistor starts to output the driving power, the first capacitor at the moment can enter a charging state, namely the first capacitor at the moment can store data voltage required by outputting the current data frame, and in the stage, because only the first thin film transistor is conducted, the current flows only on the paths corresponding to the first resistor, the first capacitor and the first thin film transistor, and does not flow through components on the light-emitting circuit, so that the effects of reducing power consumption and loss of the PMOLED are achieved.
Wherein, R1 is a first resistor, C1 is a first capacitor, M1 is a first thin film transistor, VIN is a power supply terminal, VLSS is a ground terminal, and S1 is a first control signal.
Further, the light emitting circuit includes: a second thin film transistor, a third thin film transistor, an organic light emitting diode, and a second resistor;
the input end of the second thin film transistor is connected to the first end of the first capacitor, the output end of the second thin film transistor is connected to the positive electrode of the organic light emitting diode, the control end of the second thin film transistor is used for receiving a second control signal, the input end of the third thin film transistor is connected to the first end of the second resistor, the output end of the third thin film transistor is connected to the second end of the first capacitor, the control end of the third thin film transistor is used for receiving the second control signal, the negative electrode of the organic light emitting diode is connected to the connection point of the second resistor and the third thin film transistor, and the second end of the second resistor is used for being connected to the gating pulse of the scanning line.
In this embodiment, as shown in fig. 6, the light-emitting circuit is provided with a second thin film transistor, a third thin film transistor, an organic light-emitting diode and a second resistor, where the second resistor is an equivalent resistor of a scan line to which a pixel unit corresponding to the light-emitting circuit is connected, and is used to reduce electrical influence and provide a stable light-emitting environment for a subsequent circuit.
The second thin film transistor and the third thin film transistor are conducted when receiving a second control signal, at the moment, the first end of the first resistor is connected with a driving power supply and the first capacitor to drive the organic light emitting diode to emit light, driving current corresponding to the driving power supply is input from the input end of the second thin film transistor, is output to the positive electrode of the organic light emitting diode from the output end of the second thin film transistor, and is output to the first end of the first capacitor from the negative electrode of the organic light emitting diode through the input end and the output end of the third thin film transistor; the driving current in the first capacitor flows out from the second end of the first capacitor to the input end of the second thin film transistor, is output from the output end of the second thin film transistor to the positive electrode of the organic light emitting diode, and is output from the negative electrode of the organic light emitting diode to the first end of the first capacitor through the input end and the output end of the third thin film transistor, so that the normal driving of the pixel unit is realized.
In fig. 6, one end of the first resistor extended is used for being connected to another pixel unit, M2 is a second thin film transistor, M3 is a third thin film transistor, D1 is an organic light emitting diode, R2 is a second resistor, and S2 is a second control signal.
Referring to fig. 7, fig. 7 is a flow chart of a first embodiment of a driving method of a display driving circuit according to the present invention, the driving method includes the following steps:
and step A10, responding to a first control signal to control the pixel unit to enter a discharging stage and/or a charging stage, wherein the discharging stage and the charging stage are that a charging and discharging circuit in the pixel unit is in an on state, and a light-emitting circuit in the pixel unit is in an off state.
In the first embodiment, the pixel unit in response to the first control signal enters the discharging stage and/or the charging stage, and specifically, the first control signal is used to turn on the first thin film transistor, so that the first thin film transistor is turned on in response to the first control signal, and the second thin film transistor and the third thin film transistor on the pixel unit are turned off, so that the circuit path on the pixel unit for the normal flow of the driving current has only the first resistor→the first capacitor→the first thin film transistor→the ground terminal VLSS, and the turned-off second thin film transistor and third thin film transistor prevent the driving current from flowing through the organic light emitting diode and the second resistor, thereby avoiding the loss of the components and the increase of the power consumption of the display driving circuit under the condition that the driving current input by the power supply terminal does not need to drive light in the charging stage.
Wherein the discharging phase and the charging phase are dynamically triggerable based on different driving situations, in particular with reference to steps a101, a102 and a201 of the first embodiment, step B10 of the second embodiment and steps C10 and C20 of the third embodiment.
And step A20, responding to a second control signal to control the pixel unit to enter a light-emitting stage, wherein the light-emitting stage is that the charge-discharge circuit is in a cut-off state, and the light-emitting circuit is in a conduction state.
In this embodiment, when the pixel unit responds to the second control signal, the light emitting stage will be entered, specifically, the second control signal is used to turn on the second thin film transistor and the third thin film transistor, so when the second control signal is responded, the first thin film transistor will be turned off, and the second thin film transistor and the third thin film transistor will be turned on, so that the circuit path on the pixel unit for the normal circulation of the driving current is the first resistor→the second thin film transistor→the organic light emitting diode→the third thin film transistor→the first end of the first capacitor, and the second end of the first capacitor→the second thin film transistor→the organic light emitting diode→the third thin film transistor→the first end of the first capacitor, and when the organic light emitting diode needs to be normally driven, the second thin film transistor and the third thin film transistor which are turned on can be connected with the driving current to drive the organic light emitting diode to emit light, so as to realize the normal driving of the pixel unit.
Optionally, the step of controlling the pixel unit to enter the discharging phase and/or the charging phase in response to the first control signal in step a10 includes:
step a101, in response to the first control signal, controlling the pixel unit to enter a discharge phase, so as to discharge the data voltage of the previous data frame in the discharge phase.
Specifically, when the SoC (System on Chip) detects that the refresh rate of the current data frame is higher than the preset refresh rate and the jump voltage between the current data frame and the previous data frame is higher than the preset jump voltage, it indicates that the conversion from the previous data frame to the current data frame is larger, the influence of the previous data frame on the current data frame is larger, the pixel unit at this time responds to the first control signal, and controls the pixel unit to enter the discharge stage based on the first control signal, and when responding to the first control signal, the first thin film transistor is turned on, and when the power end at this time does not have the condition of inputting the driving current, the charge stored in the first capacitor flows from the second end to the first end, so as to discharge the data voltage of the previous data frame.
The preset refresh rate and the preset jump voltage are both judgment standards for controlling the pixel units to enter corresponding control flows based on actual application conditions.
And step A102, when the data voltage of the previous data frame is completely discharged, responding to the first control signal, and controlling the pixel unit to enter a charging stage so as to charge the pixel unit in the charging stage.
When the data voltage of the previous data frame stored in the first capacitor is reduced to zero, the data voltage of the previous data frame is completely released, so that the power end still responds to the first control signal, the driving current is input to enable the charge to be accumulated on the first end and the second end of the first capacitor, namely the first capacitor is charged, and the driving current input by the power end does not flow through components in the light-emitting circuit, namely the organic light-emitting diode and the second resistor, because the second thin film transistor and the third thin film transistor are cut off at the moment, the driving current does not flow through the components in the light-emitting circuit, namely the organic light-emitting diode and the second resistor, the driving current does not consume the organic light-emitting diode and the second resistor, and relatively, the driving current does not cause the loss of the organic light-emitting diode and the second resistor, so that the situations of large power consumption and high loss of the PMOLED are avoided, and the application field of the PMOLED is improved.
Optionally, the step of controlling the pixel unit to enter the light emitting stage in response to the second control signal in step a20 includes:
Step a201, when the data voltage of the pixel unit is charged to the preset data voltage of the current data frame, the pixel unit is controlled to enter a light-emitting stage in response to a second control signal, so as to drive the pixel unit to emit light in the light-emitting stage.
When the data voltage stored in the first capacitor reaches the voltage of the power supply terminal, the data voltage of the pixel unit is considered to be charged to the preset data voltage of the current data frame (that is, the preset data voltage is the voltage that the power supply terminal dynamically changes based on the data voltage required by the current data frame), at this time, the controller outputs the second control signal and stops outputting the first control signal, the pixel unit enters the light-emitting stage based on the second control signal, and when the second control signal is responded, the first thin film transistor is turned off, the second thin film transistor and the third thin film transistor are turned on, and at this time, the driving current input by the power supply terminal and the data current stored in the first capacitor flow to the organic light-emitting diode to drive the organic light-emitting diode to emit light.
The first control signal and the second control signal are output by any module or unit capable of outputting control signals in the display driving circuit.
Referring to fig. 8, in the discharging stage, the storage capacitor (corresponding to the first capacitor in fig. 6) directly discharges the data voltage of the previous data frame stored in the storage capacitor to the ground, so that not only can the influence of the data voltage of the previous data frame on outputting the current data frame be avoided, but also the reset speed of the storage capacitor can be increased; when the organic light emitting diode is in a charging stage, the data voltage stored in the storage capacitor is gradually increased until the preset data voltage, and compared with the organic light emitting diode and the existing OLED in the embodiment, the organic light emitting diode in the embodiment has no voltage in the charging stage, and the voltage of the existing OLED in the charging stage is increased along with the increase of the data voltage stored in the storage capacitor, but because the existing OLED does not need to emit light at this time, the organic light emitting diode in the embodiment has the advantages of low power consumption and low loss compared with the existing OLED; when the organic light emitting diode is in the light emitting stage, although the storage capacitor drives the light emitting circuit, the data voltage in the storage capacitor is kept stable because the power supply end always inputs the driving current, and compared with the organic light emitting diode and the existing OLED in the embodiment, the organic light emitting diode in the embodiment has the voltage to drive and emit light in the light emitting stage, and the existing OLED drives and emits light based on the voltage existing in the charging stage, so that the organic light emitting diode in the embodiment can avoid the current consumption in the charging stage and the loss caused by the current flowing through the charging current, thereby realizing the reduction of the power consumption of the PMOLED and the reduction of the loss of components related to the light emitting stage.
In fig. 8, t1 is a discharging phase, t2 is a charging phase, t3 is a light-emitting phase, C is a storage capacitor, D1 is an organic light-emitting diode, the horizontal axis is time, and the vertical axis is a voltage value, it should be noted that the OLED and the organic light-emitting diode are substantially the same, the names are different only for convenience of distinction, and the voltage of the organic light-emitting diode increases rapidly at a moment when the light-emitting circuit is turned on, and a target driving voltage (preset data voltage) is reached to enter the light-emitting phase, and the increasing moment is negligible.
In this embodiment, the first control signal is responded to control the pixel unit to enter a discharging stage and/or a charging stage, where the discharging stage and the charging stage are in an on state by a charge-discharge circuit in the pixel unit, and the light-emitting circuit in the pixel unit is in an off state, and the second control signal is responded to control the pixel unit to enter a light-emitting stage, where the light-emitting stage is in an off state by the charge-discharge circuit, and the light-emitting circuit is in an on state, so that on the premise of ensuring that a pixel module in the PMOLED can normally emit light, power consumption of the PMOLED is reduced and loss of components associated with the light-emitting stage is reduced.
Referring to fig. 9, fig. 9 is a flowchart of a driving method of a driving circuit according to a second embodiment of the present invention, in step a10, the step of controlling a pixel unit to enter a discharging phase and/or a charging phase in response to a first control signal includes:
and B10, when the data voltage of the current data frame is detected to be higher than the data voltage of the previous data frame, controlling the pixel unit to enter a charging stage in response to the first control signal so as to charge the data voltage of the pixel unit to the preset data voltage of the current data frame in the charging stage.
In the second embodiment, when the refresh rate of the current data frame is detected to be lower than the preset refresh rate and the jump voltage between the current data frame and the previous data frame is detected to be lower than the preset jump voltage by the SoC, the change between the previous data frame and the current data frame is smaller, and the influence of the previous data frame on the current data frame is negligible.
Therefore, when the data voltage of the current data frame is detected to be higher than the data voltage of the previous data frame, the pixel unit can be directly controlled to enter the charging stage in response to the first control signal, that is, the pixel unit at the moment does not enter the discharging stage, because when the data voltage of the previous data frame is higher than the data voltage of the previous data frame under the condition that the influence of the previous data frame on the current data frame is negligible, the data voltage of the previous data frame can meet the data voltage of the current data frame part, and the data voltage required by the current data frame (namely, the preset data voltage) can be directly reached only by charging on the basis of the data voltage of the previous data frame.
Referring to fig. 10 specifically, in the discharging stage, the data voltage in the storage capacitor is kept unchanged, i.e. the discharging stage is skipped to directly enter the charging stage, after the data voltage in the storage capacitor is charged to the preset data voltage, the pixel unit is controlled to enter the light emitting stage, as can be seen from fig. 10, the organic light emitting diode in the embodiment drives and emits light based on the driving current when the pixel unit enters the light emitting stage, the aging speed of the organic light emitting diode in the charging stage when the organic light emitting diode starts to be connected to the driving current is fast, the service cycle of the light emitting component in the PMOLED is prolonged, and the display reaction speed of the pixel unit is accelerated.
In fig. 10, t1 is a discharging phase, t2 is a charging phase, t3 is a light emitting phase, C is a storage capacitor, D1 is an organic light emitting diode, the horizontal axis is time, the vertical axis is a voltage value, and the voltage of the organic light emitting diode increases rapidly at an instant when the light emitting circuit is turned on, and the target driving voltage (preset data voltage) is reached and enters the light emitting phase, and the increasing instant is negligible.
In this embodiment, when it is detected that the data voltage of the current data frame is higher than the data voltage of the previous data frame, the pixel unit is controlled to enter the charging stage in response to the first control signal, so that the data voltage of the pixel unit is quickly charged to the preset data voltage of the current data frame in the charging stage, the aging speed of the organic light emitting diode when the organic light emitting diode starts to be connected to the driving current in the charging stage is fast, the service period of the light emitting component in the PMOLED is prolonged, and the display reflection speed of the pixel unit is also accelerated.
Referring to fig. 11, fig. 11 is a flowchart illustrating a driving method of a driving circuit according to a third embodiment of the present invention, in step a10, the step of controlling a pixel unit to enter a discharging phase and/or a charging phase in response to a first control signal includes:
and step C10, when the data voltage of the current data frame is lower than the data voltage of the previous data frame, responding to the first control signal, and controlling the pixel unit to enter a discharge stage so as to discharge the data voltage of the previous data frame in the discharge stage.
And step C20, when the data voltage of the previous data frame is discharged to a preset voltage level, responding to the first control signal, and controlling the pixel unit to enter a charging stage so as to charge the data voltage of the pixel unit to the preset data voltage of the current data frame in the charging stage.
In the third embodiment, when the refresh rate of the current data frame is detected to be lower than the preset refresh rate and the jump voltage between the current data frame and the previous data frame is detected to be lower than the preset jump voltage by the SoC, the change between the previous data frame and the current data frame is smaller, and the influence of the previous data frame on the current data frame is negligible.
When the data voltage of the current data frame is detected to be lower than the data voltage of the previous data frame, the capacitor storing the data voltage of the previous data frame is controlled to be partially reset in response to the first control signal, namely, the pixel unit in the embodiment can enter the discharging stage, but the data voltage of the previous data frame is not completely discharged like the pixel unit in the first embodiment, because the data voltage of the previous data frame can be directly applied to the current data frame under the condition that the influence of the previous data frame on the current data frame is negligible, and the output of the current data frame is not influenced.
Therefore, in this embodiment, in order to avoid the influence of a part of the data voltages greater than the data voltage of the current data frame in the data voltage of the previous data frame on the current data, the pixel unit is controlled to enter a discharging stage, so that after the data voltage of the previous data frame stored in the storage capacitor is discharged to a voltage level, the data voltage in the storage capacitor is subjected to supplementary charging, and then the data voltage in the storage capacitor is quickly pulled up to a preset data voltage, so that the charging precision of the storage capacitor is improved while the display response speed of the pixel unit is improved.
That is, referring to fig. 12, when the discharging stage is entered, the data voltage of the previous data frame stored in the storage capacitor is controlled to be discharged to the voltage level, then the charging stage is controlled to carry out the supplementary charging of the data voltage in the storage capacitor, the potential of the data voltage is pulled up, the data voltage in the storage capacitor is charged to the preset data voltage, so as to improve the charging precision of the storage capacitor, and the pixel unit is driven to carry out the driving light emission when the storage capacitor is controlled to enter the light emission stage, while the organic light emitting diode is still driven to carry out the driving light emission when the organic light emitting diode enters the light emission stage, so that the aging speed of the organic light emitting diode when the organic light emitting diode starts to be connected to the driving current in the charging stage is fast, and the service period of the light emitting element in the PMOLED is prolonged.
The voltage level is a bleed-off potential which is set based on practical conditions and can improve the charging accuracy of the storage capacitor to the greatest extent, t1 in fig. 12 is a discharge phase, t2 is a charge phase, t3 is a light-emitting phase, C is a storage capacitor, D1 is an organic light-emitting diode, the horizontal axis is time, the vertical axis is a voltage value, and the organic light-emitting diode is rapidly increased in voltage at an instant when the light-emitting circuit is turned on, and a target driving voltage (preset data voltage) is reached to enter the light-emitting phase, and the increase instant is negligible.
In this embodiment, when it is detected that the data voltage of the current data frame is lower than the data voltage of the previous data frame, the pixel unit is controlled to enter a discharging stage in response to the first control signal, so as to discharge the data voltage of the previous data frame in the discharging stage, and when the data voltage of the previous data frame is discharged to a preset voltage level, the pixel unit is controlled to enter a charging stage in response to the first control signal, so as to charge the data voltage of the pixel unit to the preset data voltage of the current data frame in the charging stage, thereby realizing the purpose of avoiding the aging speed of the organic light emitting diode when the organic light emitting diode starts to be connected to the driving current in the charging stage, prolonging the service period of the light emitting element in the PMOLED, and improving the accuracy of the stored data voltage.
In addition, the embodiment of the invention also provides a display panel, which comprises a memory, a processor and a computer processing program stored on the memory and capable of running on the processor, wherein the processor realizes the steps of the driving method of the display driving circuit when executing the computer processing program.
The present invention also proposes a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the driving method of the display driving circuit described above.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as above, comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method of the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (10)

1. A display driving circuit, comprising: the device comprises a data driving module, a scanning driving module and a pixel module which is respectively connected with the data driving module and the scanning driving module, wherein the pixel module comprises a plurality of pixel units, and the device is characterized in that the pixel units comprise:
the charging and discharging circuit is connected to the data line of the data driving module, is conducted in a discharging stage and a charging stage, and is used for discharging the data voltage of the previous data frame in the pixel unit and charging the data voltage of the pixel unit to a preset data voltage of the current data frame;
the light-emitting circuit is connected with the charge-discharge circuit, the driving end of the light-emitting circuit is connected to the scanning line of the scanning driving module, and the light-emitting circuit is conducted in a light-emitting stage and used for driving light emission according to the data voltage of the accessed current data frame.
2. The display drive circuit according to claim 1, wherein the charge-discharge circuit includes: the first thin film transistor, the first capacitor and the first resistor;
the input end of the first thin film transistor is connected with the first end of the first capacitor, the output end of the first thin film transistor is grounded, and the control end of the first thin film transistor is used for receiving a first control signal;
the first end of the first resistor is connected with the power end, and the second end of the first resistor is connected with the second end of the first capacitor.
3. The display driver circuit according to claim 2, wherein the light-emitting circuit includes: a second thin film transistor, a third thin film transistor, an organic light emitting diode, and a second resistor;
the input end of the second thin film transistor is connected to the first end of the first capacitor, the output end of the second thin film transistor is connected with the positive electrode of the organic light emitting diode, and the control end of the second thin film transistor is used for receiving a second control signal;
the input end of the third thin film transistor is connected with the first end of the second resistor, the output end of the third thin film transistor is connected with the second end of the first capacitor, and the control end of the third thin film transistor is used for receiving the second control signal;
The negative electrode of the organic light-emitting diode is connected to the connection point of the second resistor and the third thin film transistor;
the second end of the second resistor is used for accessing the gating pulse of the scanning line.
4. A driving method of a display driving circuit, characterized in that the driving method is applied to the display driving circuit according to any one of claims 1 to 3, the driving method comprising the steps of:
responding to a first control signal to control a pixel unit to enter a discharging stage and/or a charging stage, wherein the discharging stage and the charging stage are that a charging and discharging circuit in the pixel unit is in an on state, and a light emitting circuit in the pixel unit is in an off state;
and responding to a second control signal to control the pixel unit to enter a light-emitting stage, wherein the light-emitting stage is that the charge-discharge circuit is in a cut-off state, and the light-emitting circuit is in a conduction state.
5. The driving method of a display driving circuit according to claim 4, wherein the step of controlling the pixel unit to enter the discharging stage and/or the charging stage in response to the first control signal in a case that the refresh rate of the current data frame is detected to be higher than the preset refresh rate and the transition voltage between the current data frame and the previous data frame is detected to be higher than the preset transition voltage, comprises:
Controlling the pixel unit to enter a discharge phase in response to the first control signal so as to discharge the data voltage of the previous data frame in the discharge phase;
and when the data voltage of the previous data frame is completely discharged, responding to the first control signal, and controlling the pixel unit to enter a charging stage so as to charge the pixel unit in the charging stage.
6. The driving method of a display driving circuit according to claim 5, wherein the step of controlling the pixel unit to enter a light emitting stage in response to a second control signal comprises:
when the data voltage of the pixel unit is charged to the preset data voltage of the current data frame, the pixel unit is controlled to enter a light-emitting stage in response to a second control signal, so that the pixel unit is driven to emit light in the light-emitting stage.
7. The driving method of a display driving circuit according to claim 4, wherein the step of controlling the pixel unit to enter the discharging phase and/or the charging phase in response to the first control signal in case that the refresh rate of the current data frame is detected to be lower than the preset refresh rate and the transition voltage between the current data frame and the previous data frame is detected to be lower than the preset transition voltage comprises:
When the data voltage of the current data frame is detected to be higher than the data voltage of the previous data frame, the pixel unit is controlled to enter a charging stage in response to the first control signal, so that the data voltage of the pixel unit is charged to the preset data voltage of the current data frame in the charging stage.
8. The driving method of a display driving circuit according to claim 4, wherein the step of controlling the pixel unit to enter the discharging phase and/or the charging phase in response to the first control signal in case that the refresh rate of the current data frame is detected to be lower than the preset refresh rate and the transition voltage between the current data frame and the previous data frame is detected to be lower than the preset transition voltage comprises:
when the data voltage of the current data frame is lower than the data voltage of the previous data frame, the pixel unit is controlled to enter a discharge stage in response to the first control signal so as to discharge the data voltage of the previous data frame in the discharge stage;
when the data voltage of the previous data frame is discharged to a preset voltage level, the pixel unit is controlled to enter a charging stage in response to the first control signal, so that the data voltage of the pixel unit is charged to the preset data voltage of the current data frame in the charging stage.
9. A display panel, the display panel comprising: a memory, a processor and a computer processing program stored on the memory and executable on the processor, the processor implementing the steps of the driving method of the display driving circuit of any one of claims 4 to 8 when the computer processing program is executed.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the driving method of the display driving circuit of any one of claims 4 to 8.
CN202310596864.3A 2023-05-24 Display driving circuit, driving method, display panel and readable storage medium Active CN116631335B (en)

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