CN111524485B - External drive circuit and drive method of OLED module and display device - Google Patents
External drive circuit and drive method of OLED module and display device Download PDFInfo
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- CN111524485B CN111524485B CN202010476008.0A CN202010476008A CN111524485B CN 111524485 B CN111524485 B CN 111524485B CN 202010476008 A CN202010476008 A CN 202010476008A CN 111524485 B CN111524485 B CN 111524485B
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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]
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Abstract
The application discloses an external drive circuit of an OLED module, a drive method and a display device, which comprise a power management module and a voltage comparison discharge module, wherein the power management module is used for outputting a light-emitting high level and a light-emitting low level to a display panel; the light-emitting high-level output circuit is provided with a voltage comparison discharge module which is used for detecting the voltage value of the light-emitting high level in the display panel and discharging the light-emitting high level in the display panel when the light-emitting high level is greater than the reference voltage. According to the technical scheme provided by the embodiment of the application, the voltage comparison discharging module is added in the external driving circuit, when low-brightness display is carried out, the module is used for detecting the light-emitting high-level voltage in the pixel circuit, and when the light-emitting high-level voltage exceeds the reference voltage, the voltage comparison discharging module is used for discharging the voltage of the light-emitting high-level port, so that normal display under the low-brightness condition is ensured.
Description
Technical Field
The invention relates to the technical field of display, in particular to an external drive circuit and a drive method of an OLED module and a display device.
Background
The OLED is also called an organic light emitting diode, and has a different light emitting principle from an LCD (liquid crystal display), and the OLED display technology has the advantages of self-luminescence, wide viewing angle, almost infinite contrast, low power consumption, extremely high response speed, and the like, and is widely used in mobile display terminal devices.
At present, due to certain fluctuation of related equipment and processes in a BP (back propagation) process of an OLED (organic light emitting diode) panel, Vth characteristics of related switch TFTs (thin film transistors) in a pixel driving circuit are abnormal probabilistically, and the Vth characteristics directly influence the working state of the TFTs, so that the pixel circuit is further abnormal in working.
Fig. 1 shows a 7T1C pixel circuit design in a current OLED panel, where T2 is SourceData write Switch TFT and T6 is Emission control Switch TFT. During low-brightness display, in a Data writing stage, T6 is closed, T2 is opened, the Source Data voltage charges Cst through T4, the Data voltage corresponding to low brightness is higher, and at the moment, the leakage of the T6 is increased, so that the ELVDD voltage at the Cst end is increased; in the light emitting stage, T2 is turned off, because of the existence of parasitic capacitance, the leakage of T2 can enable the Data voltage to charge the N2 point, at this time, T6 is turned on, the N2 point is at the same potential as the ELVDD, if the voltage of the N2 point is greater than the actual ELVDD provided by the external power management module, the external ELVDD is disconnected from supplying due to the protection circuit mechanism of the power management module, at this time, the voltage of the OLED anode in the light emitting loop is N2, the voltage is greater than the actual ELVDD, and therefore the display Gamma curve of the module deviates from the normal curve, and abnormal display occurs.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide an external driving circuit and a driving method for an OLED module, and a display device.
In a first aspect, an external driving circuit for an OLED module is provided, which includes a power management module and a voltage comparison discharge module,
the power management module is used for outputting a light emitting high level (ELVDD) and a light emitting low level (ELVSS) to the display panel;
the voltage comparison discharge module is arranged in the light-emitting high-level output circuit and used for detecting a voltage value of a light-emitting high level (ELVDD) in the display panel and discharging the light-emitting high level in the display panel when the light-emitting high level is greater than a reference voltage.
In a second aspect, a display device is provided, which includes the OLED module external driving circuit.
In a third aspect, there is provided a driving method for driving the external driving circuit of the OLED module, the voltage comparison discharging module includes a voltage comparator and a P-MOSFET switch circuit, the inverting input terminal of the voltage comparator is connected to a light emitting high level output line of the display panel,
if the input voltage of the reverse input end of the voltage comparator is greater than the reference voltage of the in-phase output end, the output end of the voltage comparator outputs a low level, the P-MOSFET switch circuit is conducted, discharging is carried out through the resistor, and the luminous high level in the display panel is restored to the reference voltage value.
According to the technical scheme provided by the embodiment of the application, the voltage comparison discharging module is added in the external driving circuit, when low-brightness display is performed, the module is used for detecting the light-emitting high-level voltage in the pixel circuit, when the light-emitting high-level voltage exceeds the reference voltage, the voltage of the light-emitting high-level port is discharged through the voltage comparison discharging module, and the voltage in the pixel circuit is restored to the actually output voltage, namely the reference voltage, through the light-emitting high-level voltage port of the power management module, so that the output stability of the light-emitting high-level port in the power management module and normal display under the low brightness are ensured.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a pixel circuit in the prior art;
FIG. 2 is a schematic diagram of a driving circuit structure in the present embodiment;
fig. 3 is a circuit diagram of the voltage comparison discharging module in the present embodiment.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 2, the present embodiment provides an external driving circuit of an OLED module, which includes a power management module and a voltage comparison discharge module,
the power supply management module is used for outputting a light-emitting high level and a light-emitting low level to the display panel;
the voltage comparison discharge module is arranged in the light-emitting high-level output circuit and used for detecting the voltage value of the light-emitting high level in the display panel and discharging the light-emitting high level in the display panel when the light-emitting high level is larger than a reference voltage.
The external driving circuit provided by this embodiment is additionally provided with a voltage comparison discharge module, when the display panel performs low-brightness display, the voltage comparison discharge module is used to perform voltage detection on the light-emitting high level ELVDD in the pixel circuit of the display panel, when the light-emitting high level ELVDD voltage exceeds a reference voltage, the voltage comparison discharge module is used to discharge the light-emitting high level voltage, and the light-emitting high level voltage port of the power management module is used to restore the voltage in the pixel circuit to an actually output voltage, i.e., the reference voltage, so as to ensure the output stability of the light-emitting high level port in the power management module and normal display at the low brightness.
Further, the display device further comprises a display driving module, wherein the display driving module is used for providing a voltage output enable signal and an S-Wire signal for the power management module.
The display driving module is used for providing a voltage output enabling signal, namely an AVDD-En signal, for the power management module, controlling the power management module to output voltage to the display driving module, outputting an S-Wire signal, namely a Single Wire enabling control signal, for the power management module through the display driving module, and controlling the power module to output a high level or a low level to the display panel.
Further, the power management module is further configured to output an AVDD level to the display driving module after receiving the voltage output enable signal,
and outputting a light emitting high level and a light emitting low level to the display panel after receiving the S-Wire signal.
In this embodiment, it is described in detail that the power management module outputs levels to the display driving module and the display panel, wherein a light-emitting high level ELVDD and a light-emitting low level ELVSS are output to the display panel after receiving the S-Wire signal, and a voltage comparison discharge module for detecting and discharging the ELVDD voltage is added to a voltage output link of the ELVDD.
Further, the voltage comparison discharging module comprises a voltage comparator and a MOSFET switch circuit, the voltage comparison discharging module is used for being connected to the light-emitting high-level output line and a reference voltage and outputting a low level when the light-emitting high level is greater than the reference voltage,
the MOSFET switch circuit is used for conducting when receiving low level.
The embodiment adopts the voltage comparator and the MOSFET switch circuit to compare and discharge the voltage, when the voltage comparator detects that the light-emitting high level ELVDD is greater than the reference voltage, the voltage output end outputs the low level, the MOSFET switch circuit is conducted after receiving the low level to discharge,
furthermore, the MOSFET switch single circuit comprises a P-MOSFET, the output end of the voltage comparator is connected to the grid electrode of the P-MOSFET, the reverse input end of the voltage comparator is connected to the light-emitting high-level output line, and the same-direction output end of the voltage comparator is connected with a reference voltage;
and the negative power end of the voltage comparator is grounded, and the positive power end of the voltage comparator is connected to the light-emitting high level.
Further, the source electrode of the P-MOSFET is connected to the light-emitting high level, a resistor is connected between the negative power supply end of the voltage comparator and the source electrode of the P-MOSFET, and a capacitor is connected between the source electrode and the drain electrode of the P-MOSFET.
As shown in fig. 3, this embodiment provides a schematic diagram of the voltage comparison discharge module, wherein the module includes a voltage comparator and a P-MOSFET switch circuit connected to each other, specifically, the inverting input terminal of the voltage comparator is connected to the light-emitting high-level ELVDD output line, the inverting output terminal is connected to a reference voltage, the ELVDD voltage of the OLED display panel is monitored by the voltage comparator, and the voltage at the output terminal of the voltage comparator is used to control the gate potential of the P-MOSFET. When the OLED display panel displays at low brightness, if the ELVDD voltage inside the display panel is larger than the reference voltage due to leakage in the phase circuit, the output end of the voltage comparator outputs a low level, namely the Ground 0 potential, at the moment, the P-MOSFET switch circuit is turned on, the ELVDD link between the power management module and the display panel discharges through the resistor R in the P-MOSFET, because the ELVDD voltage port of the power management module has strong driving capability, the ELVDD potential in the display panel is pulled to the potential actually output by the power management module, namely the reference voltage value, so that the output stability of the ELVDD port of the power management module is ensured, and normal display of the display panel is realized at low brightness.
Further, the reference voltage value is 4.6V. The homodromous output end is connected to the display driving module, the display driving module provides reference voltage for the voltage comparator, the reference voltage value is set to be 4.6V according to the condition of the current OLED display panel, and correction can be performed according to the condition of the actual display panel.
The embodiment also provides a display device comprising the OLED module external driving circuit.
In this embodiment, a voltage comparing and discharging module is provided to compare the actual voltage of ELVDD, and when the actual voltage exceeds the reference voltage value, the voltage comparing and discharging module discharges through the resistor R.
The present embodiment further provides a driving method for driving the external driving circuit of the OLED module, wherein the voltage comparison discharging module comprises a voltage comparator and a P-MOSFET switch circuit, an inverting input terminal of the voltage comparator is connected to a light emitting high level output line of the display panel,
if the input voltage of the reverse input end of the voltage comparator is greater than the reference voltage of the in-phase output end, the output end of the voltage comparator outputs a low level, the P-MOSFET switch circuit is conducted, discharging is carried out through the resistor, and the luminous high level in the display panel is restored to the reference voltage value.
In the embodiment, a voltage comparison discharging module is added in the external driving circuit, so that during low-brightness display, the module detects the light-emitting high-level voltage in the pixel circuit, when the light-emitting high-level voltage exceeds a reference voltage, the voltage of the light-emitting high-level port is discharged through the voltage comparison discharging module, and the voltage in the pixel circuit is restored to the actually output voltage, namely the reference voltage, through the light-emitting high-level voltage port of the power management module, so that the output stability of the light-emitting high-level port in the power management module and normal display under the low brightness are ensured.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (7)
1. An external driving circuit of OLED module is characterized in that it includes a power management module and a voltage comparison discharge module,
the power supply management module is used for outputting a light-emitting high level and a light-emitting low level to the display panel;
the voltage comparison discharge module is arranged in the light-emitting high-level output circuit and used for detecting the voltage value of the light-emitting high level in the display panel and discharging the light-emitting high level in the display panel when the light-emitting high level is greater than a reference voltage;
the voltage comparison discharging module comprises a voltage comparator and a MOSFET switch circuit, the voltage comparison discharging module is used for being connected to the light-emitting high-level output line and a reference voltage and outputting a low level when the light-emitting high level is greater than the reference voltage,
the MOSFET switch circuit is used for conducting when receiving low level;
the MOSFET switch circuit comprises a P-MOSFET, the source electrode of the P-MOSFET is connected to the luminous high level, a resistor is connected between the negative power supply end of the voltage comparator and the source electrode of the P-MOSFET, and a capacitor is connected between the source electrode and the drain electrode of the P-MOSFET.
2. The OLED module external driving circuit of claim 1, further comprising a display driving module for providing a voltage output enable signal and an S-Wire signal to the power management module.
3. The OLED module external driving circuit of claim 2, wherein the power management module is further configured to output an AVDD level to the display driving module after receiving the voltage output enable signal,
and outputting a light emitting high level and a light emitting low level to the display panel after receiving the S-Wire signal.
4. The OLED module external driving circuit of claim 1, wherein the MOSFET switch circuit comprises a P-MOSFET, the output terminal of the voltage comparator is connected to the gate of the P-MOSFET, the inverting input terminal of the voltage comparator is connected to the light emitting high level output line, the non-inverting input terminal of the voltage comparator is connected to a reference voltage,
the negative power end of the voltage comparator is grounded, and the positive power end of the voltage comparator is connected to the light-emitting high level.
5. The OLED module external driving circuit of claim 1, wherein the reference voltage value is 4.6V.
6. A display device comprising the OLED module external driving circuit of any one of claims 1-5.
7. A driving method for driving the external driving circuit of the OLED module as claimed in any one of claims 1-5, wherein the voltage comparison discharging module comprises a voltage comparator and a P-MOSFET switch circuit, the inverting input terminal of the voltage comparator is connected to the light emission high level output line of the display panel,
if the input voltage of the inverting input end of the voltage comparator is greater than the reference voltage of the non-inverting input end, the output end of the voltage comparator outputs a low level, the P-MOSFET switch circuit is conducted, discharging is carried out through the resistor, and the luminous high level in the display panel is restored to the reference voltage value.
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| CN202010476008.0A CN111524485B (en) | 2020-05-29 | 2020-05-29 | External drive circuit and drive method of OLED module and display device |
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| CN112269465B (en) * | 2020-10-27 | 2023-03-14 | 维沃移动通信有限公司 | Method and device for preventing screen flashing and electronic equipment |
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