CN110689849B - Display panel, driving method thereof and display device - Google Patents
Display panel, driving method thereof and display device Download PDFInfo
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- CN110689849B CN110689849B CN201911088851.5A CN201911088851A CN110689849B CN 110689849 B CN110689849 B CN 110689849B CN 201911088851 A CN201911088851 A CN 201911088851A CN 110689849 B CN110689849 B CN 110689849B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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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
- 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
Abstract
The invention relates to the technical field of display, and provides a display panel driving method, which comprises the following steps: acquiring a brightness control value of a display panel; acquiring an ambient temperature; obtaining critical cathode driving voltage corresponding to the brightness control value and the ambient temperature according to a preset mapping relation by utilizing the brightness control value and the ambient temperature; and driving the cathode of the light emitting unit in the display panel by using the critical cathode driving voltage. The method can adjust the cathode voltage of the light emitting unit in the display panel according to the brightness control value and the ambient temperature, so that the display panel can realize minimum power consumption while ensuring the display quality under different brightness control values and ambient temperatures.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a driving method thereof and a display device.
Background
In the OLED pixel driving circuit, the driving transistor can accurately control the output current of the driving transistor through a data signal only by working in a saturation region, so that the display quality is ensured. Meanwhile, the cathode voltage of the light emitting diode in the pixel driving circuit can affect the working area of the driving transistor. The driving transistor enters a linear region due to the fact that the cathode voltage of the light emitting diode is too large, color cast of screen display is caused, and power consumption of the display panel is increased due to the fact that the cathode voltage of the light emitting diode is too small.
In the related art, after the design of the driving transistor is determined, the output characteristic of the driving transistor is obtained through a simulation or detection method, so as to determine the cathode voltage of the light emitting diode according to the output characteristic of the driving transistor, wherein the cathode voltage of the light emitting diode enables the driving transistor to work in a saturation region.
However, the ambient temperature of the driving transistor and the driving brightness of the display panel both affect the output characteristics of the driving transistor, which results in abnormal display of the actual product under different ambient temperatures and driving brightness.
It is to be noted that the information invented in the above background section is only for enhancing the understanding of the background of the present invention, and therefore, may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a display panel, a driving method thereof and a display device. The display panel driving method can solve the technical problem that display abnormality occurs to the display panel at different temperatures in the related art.
Additional features and advantages of the invention will be set forth in the detailed description which follows, or may be learned by practice of the invention.
According to an aspect of the present invention, there is provided a display panel driving method including:
acquiring a brightness control value of a display panel;
acquiring an ambient temperature;
obtaining critical cathode driving voltage corresponding to the brightness control value and the ambient temperature according to a preset mapping relation by utilizing the brightness control value and the ambient temperature;
and driving the cathode of the light emitting unit in the display panel by using the critical cathode driving voltage.
In an exemplary embodiment of the present invention, the driving method further includes: establishing the preset mapping relationship, wherein the establishing of the preset mapping relationship comprises:
obtaining a critical cathode driving voltage under a preset brightness control value and a preset environment temperature, wherein the critical cathode driving voltage can enable a driving transistor in the display panel to be located at a boundary point of a saturation region and a linear region;
and establishing a mapping relation between the preset brightness control value, the preset environment temperature and the critical cathode driving voltage.
In an exemplary embodiment of the present invention, obtaining a threshold cathode driving voltage at a predetermined ambient temperature at a predetermined brightness control value comprises:
under the preset environment temperature, the display panel is controlled to emit light by utilizing the preset brightness control value;
gradually changing the cathode driving voltage according to a preset voltage interval, and detecting the actual brightness of the display panel under each cathode driving voltage;
calculating the actual brightness difference of the display panel under the adjacent cathode driving voltage;
and when the actual brightness difference is larger than a preset brightness difference, acquiring a smaller cathode driving voltage in the adjacent cathode driving voltages as the critical cathode driving voltage, or when the actual brightness difference is smaller than a preset brightness difference, acquiring a smaller cathode driving voltage in the adjacent cathode driving voltages as the critical cathode driving voltage.
In an exemplary embodiment of the present invention, detecting the actual brightness of the display panel at each of the cathode driving voltages includes:
and detecting the brightness of the middle position of the cathode driving voltage wiring in the display panel as the actual brightness.
In one exemplary embodiment of the present invention, gradually changing the cathode driving voltage at preset voltage intervals includes:
the cathode driving voltage is gradually increased or decreased at preset voltage intervals.
In an exemplary embodiment of the present invention, the preset voltage interval is 0.1V.
According to an aspect of the present invention, there is provided a display panel including: temperature sensor, treater, drive circuit. The temperature sensor is used for detecting the ambient temperature; the processor is used for acquiring a brightness control value of the display panel and acquiring critical cathode driving voltage corresponding to the brightness control value and the ambient temperature according to a preset mapping relation by using the brightness control value and the ambient temperature; the driving circuit is used for driving the cathode of the light-emitting unit in the display panel by using the critical cathode driving voltage.
In an exemplary embodiment of the present invention, the preset mapping relationship includes: and the mapping relation of the brightness control value, the environment temperature and the critical cathode driving voltage, wherein the critical cathode driving voltage can enable the driving transistor in the display panel to be positioned at the boundary point of a saturation region and a linear region.
In an exemplary embodiment of the present invention, the processor is a single chip microcomputer.
According to an aspect of the present invention, there is provided a display device including the display panel described above.
The present disclosure provides a display panel driving method, including: acquiring a brightness control value of a display panel; acquiring an ambient temperature; obtaining critical cathode driving voltage corresponding to the brightness control value and the ambient temperature according to a preset mapping relation by utilizing the brightness control value and the ambient temperature; and driving the cathode of the light emitting unit in the display panel by using the critical cathode driving voltage. The method can adjust the cathode voltage of the light-emitting unit in the display panel according to the brightness control value and the ambient temperature, so that the display panel can ensure the display quality and realize the minimum power consumption at different brightness control values and ambient temperatures.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of a pixel driving circuit in a display panel according to the related art;
FIG. 2 is a graph showing the output characteristics of a driving transistor under different brightness driving conditions;
FIG. 3 is a graph showing the output characteristics of a driving transistor driven at different temperatures;
FIG. 4 is a flow chart of an exemplary embodiment of a display panel driving method of the present disclosure;
FIG. 5 is a diagram illustrating a mapping relationship in an exemplary embodiment of a display panel driving method according to the present disclosure;
FIG. 6 is a graph of the variation of the display panel luminance and the cathode driving voltage in an exemplary embodiment of the display panel driving method of the present disclosure;
FIG. 7 is a graph of variation of a luminance variation rate of a display panel and a cathode driving voltage according to an exemplary embodiment of a driving method of a display panel according to the present disclosure;
FIG. 8 is a graph of variation of a luminance variation rate of a display panel and a cathode driving voltage in another exemplary embodiment of a display panel driving method according to the present disclosure;
fig. 9 is a schematic structural diagram of an exemplary embodiment of a display panel according to the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". Other relative terms, such as "high," "low," "top," "bottom," "left," "right," and the like are also intended to have similar meanings. When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.
The terms "a," "an," "the," and the like are used to denote the presence of one or more elements/components/parts; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.
Fig. 1 is a schematic structural diagram of a pixel driving circuit in a display panel according to the related art. The pixel driving circuit comprises a switching transistor T1, a driving transistor T2 and a capacitor C, wherein a first end of the first transistor is connected with a source driving signal end Data, a control end of the first transistor is connected with a Gate driving signal end Gate, and a second end of the first transistor is connected with a Gate G of the driving transistor T2; the drain D of the driving transistor T2 is connected to the first power signal terminal VDD, the anode of the light emitting unit LED is connected to the source S of the driving transistor T2, the cathode of the light emitting unit LED receives the cathode driving voltage VSS, and the capacitor is connected between the second terminal of the first transistor and the second terminal of the second transistor. In the pixel driving circuit, the driving transistor needs to work in a saturation region, and the source driving signal end Data can control the output current of the source of the driving transistor T2 by controlling the gate voltage of the driving transistor T2, so that the light emitting unit LED is accurately controlled to emit light. According to the characteristics of the transistor, when VDS is large, the region of the transistor in the saturation region can be increased, so that the transistor is ensured to be in the saturation region. Referring to fig. 1, VDS can be changed by changing the cathode driving voltage VSS, and VDS is decreased when the cathode driving voltage VSS is decreased; VDS increases as the cathode drive voltage VSS increases. Therefore, the cathode driving voltage VSS can be reduced to ensure that the driving transistors are in the saturation region, however, reducing the cathode driving voltage VSS also causes an increase in power consumption of the display panel. In the related art, the power consumption for driving the display panel is usually reduced as much as possible while the driving transistor is kept in the saturation region by setting the cathode driving voltage VSS appropriately.
However, as shown in fig. 2, it IS an output characteristic curve of the driving transistor under different luminance driving, where IS a source output current of the driving transistor, and VDS IS a source-drain voltage difference of the driving transistor. As can be seen from fig. 2, in the high-luminance driving state, the saturation region of the driving transistor is located behind the point B, and in the low-luminance driving state, the saturation region of the driving transistor is located behind the point a, so the driving luminance of the display panel affects the transistor output characteristics of the driving transistor. As shown in fig. 3, it IS an output characteristic curve of the driving transistor under different temperature driving, where IS a source output current of the driving transistor, and VDS IS a source-drain voltage difference of the driving transistor. As can be seen from fig. 3, in the high temperature environment, the saturation region of the driving transistor is located behind the point B, in the low temperature environment, the saturation region of the driving transistor is located behind the point a, and in the normal temperature environment, the saturation region of the driving transistor is located behind the point C. Therefore, the ambient temperature of the display panel also affects the output characteristics of the driving transistors. When the ambient temperature and the driving brightness of the display panel change, abnormal display of the display panel may be caused.
Based on this, the present disclosure provides a display panel driving method, as shown in fig. 4, which is a flowchart of an exemplary embodiment of the display panel driving method of the present disclosure, the display panel driving method including:
step S1: acquiring a brightness control value of a display panel;
step S2: acquiring an ambient temperature;
step S3: obtaining critical cathode driving voltage corresponding to the brightness control value and the ambient temperature according to a preset mapping relation by utilizing the brightness control value and the ambient temperature;
step S4: and driving the cathode of the light emitting unit in the display panel by using the critical cathode driving voltage.
The method can adjust the cathode voltage of the light-emitting unit in the display panel according to the brightness control value and the ambient temperature, so that the display panel can ensure the display quality and realize the minimum power consumption at different brightness control values and ambient temperatures.
The above steps are explained in detail below:
in the present exemplary embodiment, the driving method may further include: establishing the preset mapping relationship, wherein establishing the preset mapping relationship may include: obtaining a critical cathode driving voltage under a preset brightness control value and a preset environment temperature, wherein the critical cathode driving voltage can enable a driving transistor in the display panel to be located at a boundary point of a saturation region and a linear region; and establishing a mapping relation between the preset brightness control value, the preset environment temperature and the critical cathode driving voltage. The mapping relationship may be represented by a chart, a database, or the like. Fig. 5 is a diagram showing a mapping relationship in an exemplary embodiment of a display panel driving method according to the present disclosure. In the graph, different environment temperatures and different brightness control values correspond to different critical cathode driving voltages, and the critical cathode driving voltages corresponding to the brightness control values and the environment temperatures can be obtained through the graph according to the brightness control values and the environment temperatures.
Fig. 6 is a graph showing the variation of the luminance of the display panel and the driving voltage of the cathode in an exemplary embodiment of the driving method of the display panel according to the present disclosure. Fig. 7 is a graph showing the variation rate of the luminance of the display panel and the variation of the cathode driving voltage in an exemplary embodiment of the driving method of the display panel according to the present disclosure. Fig. 6 and 7 can be obtained by detecting the brightness of the display panel at different cathode driving voltages. When the cathode driving voltage VSS makes the driving transistor in the saturation region, the actual display brightness L of the display panel is substantially unchanged. When the cathode driving voltage VSS makes the driving transistor transition from a saturation region to a linear region, the luminance L of the display panel changes, and the luminance change amount Δ L gradually increases. In fig. 7, the wavy line jitter represented by the luminance variation Δ L is caused by an error in the detection process. Fig. 8 is a graph showing a variation ratio of a luminance of a display panel and a cathode driving voltage in another exemplary embodiment of a method for driving a display panel according to the present disclosure. The luminance difference in fig. 8 can be obtained by averaging the adjacent three luminance differences in fig. 7. It is clear that the process of brightness difference variation is much smoother as presented in fig. 8.
In the present exemplary embodiment, obtaining a critical cathode driving voltage at the preset brightness control value and the preset ambient temperature may include: under the preset environment temperature, the display panel is controlled to emit light by utilizing the preset brightness control value; gradually changing the cathode driving voltage according to a preset voltage interval, and detecting the actual brightness of the display panel under each cathode driving voltage; calculating the actual brightness difference of the display panel under the adjacent cathode driving voltage; and when the actual brightness difference is larger than a preset brightness difference, acquiring a smaller cathode driving voltage in the adjacent cathode driving voltages as the critical cathode driving voltage, or when the actual brightness difference is smaller than a preset brightness difference, acquiring a smaller cathode driving voltage in the adjacent cathode driving voltages as the critical cathode driving voltage. Wherein gradually changing the cathode driving voltage according to a preset voltage interval may include: the cathode driving voltage is gradually increased or decreased at preset voltage intervals. For example, the initial cathode driving voltage may be-5V, when the driving transistor is in a saturation region, the cathode driving voltage is gradually increased at voltage intervals of 0.1V, so that when the actual luminance difference is greater than the preset luminance difference, a smaller cathode driving voltage of the adjacent cathode driving voltages is a critical cathode driving voltage. For another example, the initial cathode driving voltage may be-1V, and the driving transistor is in a linear region at this time, and the cathode driving voltage is gradually decreased at voltage intervals of 0.1V, so that when the actual luminance difference is smaller than the preset luminance difference, a smaller cathode driving voltage among the adjacent cathode driving voltages is obtained as the critical cathode driving voltage. The preset brightness difference can be set according to requirements, and when the preset brightness difference is larger, the power consumption of the display panel is larger; when the preset luminance difference is smaller, the power consumption of the display panel is smaller.
Because the cathode driving voltage wiring on the display panel has impedance, the cathode driving voltage at the far end of the power supply chip is higher than the near-end voltage. In this exemplary embodiment, detecting the actual brightness of the display panel at each of the cathode driving voltages may include: and detecting the brightness of the middle position of the cathode driving voltage wiring in the display panel as the actual brightness. The method can obtain the critical cathode driving voltage of the driving transistor in the saturation region at the middle position of the cathode driving voltage routing in the display panel. The critical cathode driving voltage error at the two ends of the cathode driving voltage wire can be reduced to the minimum by driving the display panel by the critical cathode driving voltage.
The present exemplary embodiment further provides a display panel, as shown in fig. 9, which is a schematic structural diagram of an exemplary embodiment of the display panel of the present disclosure. The display panel includes: temperature sensor 1, processor 2, drive circuit 3. The temperature sensor 1 is used for detecting the ambient temperature; the processor 2 is configured to obtain a brightness control value of the display panel, and obtain a critical cathode driving voltage corresponding to the brightness control value and an ambient temperature according to a preset mapping relationship by using the brightness control value and the ambient temperature; the driving circuit 3 is used for driving the cathodes of the light emitting units in the display panel by using the critical cathode driving voltage.
The display panel may include the pixel driving circuit shown in fig. 1, and may also include pixel driving circuits with other structures, such as 7T1C, 3T1C, and the like. The processor can be a single chip microcomputer. The driving circuit 3 may be a power driving chip.
In this exemplary embodiment, the preset mapping relationship includes: and the mapping relation of the brightness control value, the environment temperature and the critical cathode driving voltage, wherein the critical cathode driving voltage can enable the driving transistor in the display panel to be positioned at the boundary point of a saturation region and a linear region.
The display panel can adjust the cathode voltage of the light-emitting unit in the display panel according to the brightness control value and the ambient temperature, so that the display panel can guarantee the display quality and realize the minimum power consumption at different brightness control values and ambient temperatures.
The present exemplary embodiment also provides a display device including the display panel described above. The display device can be a television, a mobile phone, a tablet computer and other display devices.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the terms of the appended claims.
Claims (4)
1. A display panel driving method, comprising:
acquiring a brightness control value of a display panel;
acquiring an ambient temperature;
obtaining critical cathode driving voltage corresponding to the brightness control value and the ambient temperature according to a preset mapping relation by utilizing the brightness control value and the ambient temperature;
driving cathodes of light emitting units in the display panel by using the critical cathode driving voltage;
the driving method further includes: establishing the preset mapping relationship, wherein the establishing of the preset mapping relationship comprises:
obtaining a critical cathode driving voltage under a preset brightness control value and a preset environment temperature, wherein the critical cathode driving voltage can enable a driving transistor in the display panel to be located at a boundary point of a saturation region and a linear region;
establishing a mapping relation between the preset brightness control value, the preset environment temperature and the critical cathode driving voltage;
obtaining a critical cathode driving voltage under a preset brightness control value and a preset ambient temperature, comprising:
under the preset environment temperature, the display panel is controlled to emit light by utilizing the preset brightness control value;
gradually changing the cathode driving voltage according to a preset voltage interval, and detecting the actual brightness of the display panel under each cathode driving voltage;
calculating the actual brightness difference of the display panel under the adjacent cathode driving voltage;
and when the actual brightness difference is larger than a preset brightness difference, acquiring a smaller cathode driving voltage in the adjacent cathode driving voltages as the critical cathode driving voltage, or when the actual brightness difference is smaller than a preset brightness difference, acquiring a smaller cathode driving voltage in the adjacent cathode driving voltages as the critical cathode driving voltage.
2. The method according to claim 1, wherein detecting the actual brightness of the display panel at each of the cathode driving voltages comprises:
and detecting the brightness of the middle position of the cathode driving voltage wiring in the display panel as the actual brightness.
3. The display panel driving method according to claim 1, wherein gradually changing the cathode driving voltage at preset voltage intervals comprises:
the cathode driving voltage is gradually increased or decreased at preset voltage intervals.
4. The method according to claim 1, wherein the predetermined voltage interval is 0.1V.
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| CN112951156B (en) * | 2021-01-28 | 2023-02-03 | 北京京东方光电科技有限公司 | Display compensation method, display compensation device and display device |
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