CN110111713B - Residual image distinguishing method and device of display panel and display equipment - Google Patents
Residual image distinguishing method and device of display panel and display equipment Download PDFInfo
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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Abstract
The invention discloses a method and a device for judging an afterimage of a display panel and display equipment, relates to the technical field of display, and aims to determine the reason for generating the afterimage of the display panel. The method for judging the residual image of the display panel comprises the following steps: performing characteristic parameter compensation on driving transistors in each pixel circuit included in the display panel, and acquiring driving signals generated by each compensated driving transistor; acquiring display brightness information of the compensated display panel; and judging the reason of generating the afterimage of the display panel according to the driving signals generated by the driving transistors after compensation and the display brightness information. The method for judging the residual image of the display panel is used for judging the reason of the residual image generated by the display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a method and a device for judging residual images of a display panel and display equipment.
Background
With the continuous development of display technology, people have higher and higher requirements on the display quality of display products. Taking an Organic Light-Emitting Diode (OLED) display panel as an example, the OLED display panel includes a plurality of pixel circuits and a plurality of Light-Emitting units corresponding to the pixel circuits one by one, and in actual application, the pixel circuits drive the corresponding Light-Emitting units to emit Light, so that the OLED display panel realizes a display function. When the OLED display panel realizes the display function, afterimages can be generated, and the generation reasons of the afterimages are various, so that the specific reasons of the afterimages are determined, the afterimage problem is effectively solved based on the reasons, and the OLED display panel is very important for improving the display quality of display products.
Disclosure of Invention
The invention aims to provide a method, a device and a display device for judging afterimage of a display panel, which are used for determining the reason of afterimage generation of the display panel.
In order to achieve the above purpose, the invention provides the following technical scheme:
a first aspect of the present invention provides a method for determining an afterimage of a display panel, including:
performing characteristic parameter compensation on driving transistors in each pixel circuit included in the display panel, and acquiring driving signals generated by each compensated driving transistor;
acquiring display brightness information of the compensated display panel;
and judging the reason of generating the afterimage of the display panel according to the driving signals generated by the driving transistors after compensation and the display brightness information.
Optionally, the step of determining the reason for generating the afterimage by the display panel according to the driving signal generated by each compensated driving transistor and the display luminance information specifically includes:
when the compensated driving signals generated by the driving transistors are the same and the display brightness of the light-emitting units of the display brightness information display panel is the same, the reason that the display panel generates the residual image is judged to be that the characteristic parameters of the driving transistors in the pixel circuits are different, and the light-emitting units correspond to the pixel circuits one to one.
Optionally, the step of determining the reason for generating the afterimage by the display panel according to the driving signal generated by each compensated driving transistor and the display luminance information specifically includes:
when the compensated driving signals generated by the driving transistors are the same and the display brightness of the light emitting units of the display brightness information display panel is different, the reason that the display panel generates the residual image is judged to be that the light emitting efficiency of the light emitting units of the display panel is different, and the light emitting units correspond to the pixel circuits one to one.
Optionally, the step of determining the reason for generating the afterimage by the display panel according to the driving signal generated by each compensated driving transistor and the display luminance information specifically includes:
when the compensated driving signals generated by the driving transistors are different and the display brightness of each light-emitting unit of the display brightness information display panel is different, judging that the reason why the display panel generates the residual image is that the characteristic parameters of the driving transistors in each pixel circuit are different; and/or judging the reason why the display panel generates the residual image is that the luminous efficiency of each luminous unit of the display panel is different, and the luminous units are in one-to-one correspondence with the pixel circuits.
Optionally, when it is determined that the reason for generating the afterimage on the display panel is that the light emitting efficiency of each light emitting unit of the display panel is different, the afterimage determining method further includes:
and optically compensating each light-emitting unit included in the display panel so that the light-emitting efficiency of each light-emitting unit included in the display panel is the same.
Optionally, the pixel circuit includes: the driving circuit comprises an input transistor, a driving transistor, a sensing transistor, a first storage capacitor and a second storage capacitor; wherein a gate of the input transistor is coupled to a first control signal line, a first pole of the input transistor is coupled to a data signal line, a second pole of the input transistor is coupled to a gate of a driving transistor, a first pole of the driving transistor is coupled to a power signal line, a second pole of the driving transistor is coupled to a corresponding light emitting cell, a first end of the first storage capacitor is coupled to the gate of the driving transistor, a second end of the first storage capacitor is coupled to the second pole of the driving transistor, a gate of the sensing transistor is coupled to a second control signal line, a first pole of the sensing transistor is coupled to the second pole of the driving transistor, and a second pole of the sensing transistor is coupled to a sensing signal line; a first end of the second storage capacitor is coupled with a sensing signal line, and a second end of the second storage capacitor is coupled with a ground signal line;
the step of obtaining the driving signal generated by each compensated driving transistor specifically includes:
the input transistor is turned on under the control of a first control signal inputted from the first control signal line; the sensing transistor is turned on under the control of a second control signal inputted from the second control signal line;
inputting a compensation data signal through the data signal line, controlling the drive transistor to be conducted to generate a drive current, and charging the second storage capacitor by using the drive current;
and after the charging is finished, sensing the voltage value stored by the second storage capacitor through the sensing signal line.
A second aspect of the present invention provides an afterimage determination device for a display panel, including:
the compensation acquisition module is used for compensating the characteristic parameters of the driving transistors in each pixel circuit included in the display panel and acquiring driving signals generated by each compensated driving transistor;
the compensation acquisition module is also used for acquiring display brightness information of the compensated display panel;
and the judging module is used for judging the reason of generating the residual image of the display panel according to the driving signals generated by the compensated driving transistors and the display brightness information.
Optionally, the determining module is specifically configured to:
when the compensated driving signals generated by the driving transistors are the same and the display brightness of the light-emitting units of the display brightness information display panel is the same, the reason that the display panel generates the residual image is judged to be that the characteristic parameters of the driving transistors in the pixel circuits are different, and the light-emitting units correspond to the pixel circuits one to one.
Optionally, the determining module is specifically configured to:
when the compensated driving signals generated by the driving transistors are the same and the display brightness of the light emitting units of the display brightness information display panel is different, the reason that the display panel generates the residual image is judged to be that the light emitting efficiency of the light emitting units of the display panel is different, and the light emitting units correspond to the pixel circuits one to one.
Optionally, the determining module is specifically configured to:
when the compensated driving signals generated by the driving transistors are different and the display brightness of each light-emitting unit of the display brightness information display panel is different, judging that the reason why the display panel generates the residual image is that the characteristic parameters of the driving transistors in each pixel circuit are different; and/or judging the reason of generating the residual image on the display panel is that the luminous efficiency of each luminous unit of the display panel is different, and the luminous units are in one-to-one correspondence with the pixel circuits.
Based on the technical solution of the afterimage determination device of the display panel, a third aspect of the present invention provides a display apparatus, including the afterimage determination device of the display panel.
In the technical scheme provided by the invention, characteristic parameters of each driving transistor in a pixel circuit included in a display panel are compensated, driving signals generated by each compensated driving transistor are obtained, and the compensation condition of each driving transistor can be determined according to the driving signals generated by each driving transistor, namely when the driving signals generated by each driving transistor after compensation are the same, no driving difference exists after compensation of each driving transistor, and when the driving signals generated by each driving transistor after compensation are different, the driving difference also exists after compensation of each driving transistor; meanwhile, the display brightness information of the display panel can be continuously acquired after compensation, and the display brightness condition of the display panel after compensation can be determined according to the display brightness information; therefore, the driving signals generated after compensation of the driving transistors and the display brightness information of the display panel after compensation can be combined to judge whether the residual image is generated by the display panel due to the difference of the characteristic parameters of the driving transistors or the difference of the efficiency of the light-emitting unit.
Therefore, the technical scheme provided by the invention can accurately judge the reason of the display panel generating the residual image, and can more effectively solve the problem of the residual image of the display panel based on the reason.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic flow chart illustrating a method for determining an afterimage of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pixel circuit according to an embodiment of the invention;
fig. 3 is a basic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to further explain the method, the apparatus and the display device for determining an afterimage of a display panel according to the embodiments of the present invention, the following description is made in detail with reference to the accompanying drawings.
Taking the OLED display panel as an example, when the OLED display panel works, the pixel circuit in the display panel drives the light emitting unit in the display panel to emit light, thereby implementing a display function. In more detail, the pixel circuit generally includes a driving transistor, and a driving current is generated by the driving transistor, and the driving current drives the light emitting unit to emit light, but since the display panel is limited by the manufacturing process during the manufacturing process, the characteristic parameters of the driving transistor included in each pixel circuit in the display panel are different, and the difference easily affects the display brightness uniformity of the display panel, so that the display panel generates an afterimage. In addition, when fabricating a light emitting unit in a display panel, an anode layer, an organic light emitting material layer, and a cathode layer are generally fabricated to be stacked, wherein the anode layer is coupled to an output electrode of a driving transistor for receiving a driving current provided by the driving transistor. Also, due to the process and the luminescent material layer, there may be a difference in the luminous efficiency of each light emitting unit included in the display panel, and such a difference also easily affects the display luminance uniformity of the display panel, resulting in the display panel generating an afterimage.
In addition, in the long-term use of the OLED display panel, the display panel is prone to generate image retention due to factors such as the stability of the driving transistor in the pixel circuit and the lifetime of the light emitting unit.
Through the analysis, the display panel has various reasons for generating the afterimage, and when the afterimage problem is actually solved, the specific reason for causing the afterimage can be determined first, and then the afterimage problem can be effectively solved based on the specific reason.
Referring to fig. 1-3, a method for determining an image sticking of a display panel according to an embodiment of the present invention includes:
step S101, performing characteristic parameter compensation on driving transistors in each pixel circuit included in a display panel, and acquiring driving signals generated by each compensated driving transistor;
step S102, obtaining display brightness information of the compensated display panel;
and step S103, judging the reason of the afterimage generated by the display panel according to the driving signals generated by the driving transistors after compensation and the display brightness information.
Specifically, an external compensation technology can be adopted, the characteristic parameters of the driving transistors in each pixel circuit are detected, corrected compensation data signals are generated, and then the compensation data signals are input into the driving transistors, so that the characteristic parameters of the driving transistors are compensated, and the problem that the display brightness of the display panel is inconsistent due to the fact that the characteristic parameters of the driving transistors in the pixel circuits are different is solved. After characteristic parameter compensation is carried out on the driving transistors in each pixel circuit included in the display panel, driving signals generated by each driving transistor after compensation are obtained.
After characteristic parameter compensation is carried out on a driving transistor included in each pixel circuit in the display panel, the display panel is controlled to be in a display state, and display brightness information of the display panel is obtained, wherein the display brightness information reflects the brightness uniformity of the display panel.
After the driving signals generated by the driving transistors after compensation and the display brightness information of the display panel are obtained, the reason for generating the afterimage of the display panel can be judged according to whether the driving signals generated by the driving transistors are consistent and the display brightness uniformity of the display panel reflected by the display brightness information.
In the method for determining an afterimage of a display panel provided by the embodiment of the invention, characteristic parameters of each driving transistor in a pixel circuit included in the display panel are compensated, a driving signal generated by each compensated driving transistor is obtained, and a compensation condition of each driving transistor can be determined according to the driving signal generated by each driving transistor, namely when the driving signals generated by each driving transistor after compensation are the same, no driving difference exists after compensation of each driving transistor, and when the driving signals generated by each driving transistor after compensation are different, driving difference also exists after compensation of each driving transistor; meanwhile, the display brightness information of the display panel can be continuously acquired after compensation, and the display brightness condition of the display panel after compensation can be determined according to the display brightness information; therefore, the driving signals generated after compensation of the driving transistors and the display brightness information of the display panel after compensation can be combined to judge whether the residual image is generated by the display panel due to the difference of the characteristic parameters of the driving transistors or the difference of the efficiency of the light-emitting unit.
Therefore, the method for judging the residual image of the display panel provided by the embodiment of the invention can accurately judge the reason of the residual image generated by the display panel, and can effectively solve the problem of the residual image of the display panel based on the reason.
In some embodiments, in the step S103, the step of determining the reason for generating the afterimage by the display panel according to the driving signal and the display luminance information generated by each of the compensated driving transistors may specifically include:
when the compensated driving signals generated by the driving transistors are the same and the display brightness of the light-emitting units of the display panel displaying the brightness information is the same, the reason that the display panel generates the residual image is judged to be that the characteristic parameters of the driving transistors in the pixel circuits are different, and the light-emitting units correspond to the pixel circuits one by one.
Specifically, when the driving signals generated by the compensated driving transistors are the same, it is indicated that the characteristic parameters corresponding to the compensated driving transistors are the same, and the driving transistors are accurately compensated, in this case, the display panel is in a display state, and when the obtained display brightness information shows that the display brightness of the light emitting units of the display panel is the same, that is, there is no residual image on the display panel, it is determined that the reason that the residual image is generated on the display panel before compensation is that the characteristic parameters of the driving transistors in the pixel circuits are different, that is, the reason that the residual image is generated on the display panel before compensation is caused by the characteristic parameter drift of the driving transistors in the backplane included in the display panel.
In some other embodiments, in the step S103, the step of determining the reason for generating the afterimage by the display panel according to the driving signal generated by each driving transistor after the compensation and the display brightness information may specifically include:
when the compensated driving signals generated by the driving transistors are the same and the display brightness information indicates that the display brightness of the light-emitting units of the display panel is different, the reason that the display panel generates the residual image is judged to be that the light-emitting efficiency of the light-emitting units of the display panel is different, and the light-emitting units correspond to the pixel circuits one to one.
Specifically, when the driving signals generated by the compensated driving transistors are the same, it is described that the characteristic parameters corresponding to the compensated driving transistors are the same, the driving transistors are accurately compensated, and the driving transistors can generate the same driving current to flow through the light emitting units.
In some other embodiments, in the step S103, the step of determining the reason for generating the afterimage by the display panel according to the driving signal and the display luminance information generated by each of the compensated driving transistors may specifically include:
when the compensated driving signals generated by the driving transistors are different and the display brightness of each light-emitting unit of the display panel for displaying brightness information is different, judging that the reason why the display panel generates the residual image is that the characteristic parameters of the driving transistors in each pixel circuit are different; and/or judging the reason of generating the residual image on the display panel is that the luminous efficiency of each luminous unit of the display panel is different, and the luminous units are in one-to-one correspondence with the pixel circuits.
Specifically, when the driving signals generated by the compensated driving transistors are different, it is described that the characteristic parameters corresponding to the compensated driving transistors are different, and the driving transistors are not accurately compensated, in this case, the display panel is in a display state, when the obtained display luminance information indicates that the display luminances of the light emitting units of the display panel are different, that is, the display panel generates an afterimage, and it can be determined that the reason why the display panel generates the afterimage is that the characteristic parameters of the driving transistors in the pixel circuits are different; and/or judging that the reason of the display panel generating the afterimage is that the luminous efficiency of each luminous unit of the display panel is different.
It should be noted that theoretically, after compensation is performed on each driving transistor, driving signals generated by each driving transistor should be the same, if the driving signals are not equal, it is indicated that each driving transistor is not accurately compensated, and at this time, elimination of an afterimage and determination of a reason also need to improve external compensation capability; in addition, when the driving transistors are not accurately compensated, the reason for generating the image retention of the display panel depends on the variation of the characteristic parameters of the driving transistors, and whether the image retention depends on the light emitting efficiency of the light emitting unit cannot be excluded.
In some embodiments, when it is determined that the reason for the display panel generating the afterimage is that the light emitting efficiency of each light emitting unit of the display panel is different, the afterimage determining method further includes:
the light emitting units included in the display panel are optically compensated so that the light emitting efficiency of the light emitting units included in the display panel is the same.
Specifically, the light emission luminance J of the light emitting unit satisfies the following formula:
J＝E×I oled formula (1)
Wherein E represents the luminous efficiency of the light-emitting unit, I oled Representing the drive current generated by the drive transistor.
When it is determined that the reason for generating the afterimage in the display panel is that the light emitting efficiencies of the light emitting units are different, a picture displayed by the display panel may be photographed by a CCD camera (charge coupled device camera) to acquire current luminance information of the display panel, and then, according to the luminance information, luminance domain optical compensation may be performed on each light emitting unit included in the display panel through a corresponding luminance compensation algorithm to compensate the light emitting efficiencies of each light emitting unit in the display panel to be uniform, so that the light emitting luminance of each light emitting unit in the display panel is uniform.
In the above-mentioned brightness compensation algorithm, a certain brightness is generally preset as a target brightness, and the brightness of all the light-emitting units is corrected to the target brightness, so that all the light-emitting units in the display panel have the target brightness when emitting light.
As shown in fig. 2, in some embodiments, the pixel circuit provided in the above embodiments may include: an input transistor T1, a driving transistor DTFT, a sensing transistor T2, a first storage capacitor C1, a second storage capacitor C2; wherein a gate of the input transistor T1 is coupled to the first control signal line Scan, a first pole of the input transistor T1 is coupled to the data signal line DL, a second pole of the input transistor T1 is coupled to a gate of the driving transistor DTFT, a first pole of the driving transistor DTFT is coupled to the power signal line ELVDD, a second pole of the driving transistor DTFT is coupled to the corresponding light emitting cell, a first end of the first storage capacitor C1 is coupled to the gate of the driving transistor DTFT, a second end of the first storage capacitor C1 is coupled to the second pole of the driving transistor DTFT, a gate of the sensing transistor T2 is coupled to the second control signal line Sense, a first pole of the sensing transistor T2 is coupled to the second pole of the driving transistor DTFT, and a second pole of the sensing transistor T2 is coupled to the sensing signal line SL; a first terminal of the second storage capacitor C2 is coupled to the sensing signal line SL, and a second terminal of the second storage capacitor C2 is coupled to the ground signal line.
The pixel circuit provided by the above embodiment may further include: a digital sampler ADC, a sampling switch SW for controlling whether the digital sampler ADC is electrically connected with the sensing signal line SL.
When the pixel circuit adopts the above structure, the step of performing characteristic parameter compensation on the driving transistor DTFT in each pixel circuit included in the display panel specifically includes:
the data signal line DL writes a test data signal by controlling the input transistor T1 to be turned on by a first control signal inputted through a first control signal line Scan, the test data signal is transmitted to the gate G of the driving transistor DTFT through the input transistor T1, the voltage of the gate G of the driving transistor DTFT is changed to Vg, and the output electrode (i.e., the source S) of the driving transistor DTFT has an initialization voltage V 0 (ii) a The sensing transistor T2 is controlled to be turned on by a second control signal inputted through a second control signal line Sense, and when a voltage difference Vgs between the gate and source electrodes of the driving transistor DTFT is greater than a threshold voltage of the driving transistor DTFT, the driving transistor DTFT is turned on to generate a driving current I oled The driving current charges the second storage capacitor C2 through the sensing transistor T2, and the source potential of the driving transistor DTFT continuously increases with the increase of the charging time until the driving transistor DTFT is in an off state, and the source potential of the driving transistor DTFT does not increase any more, and the charging of the second storage capacitor C2 is stopped; at this time, the voltage Vs (i.e., the sensing voltage) of the source of the driving transistor DTFT is sensed through the sensing signal line SL, and the threshold voltage Vth of the driving transistor DTFT is Vg-Vs.
Threshold voltage Vth, mobility K, and drive current I of drive transistor DTFT oled The following formula is satisfied:
wherein Cox is a gate oxide layer capacitance, W/L is a width-to-length ratio of a channel region of the driving transistor DTFT, and Vgs is a gate-source voltage of the driving transistor DTFT. From equation (2), it can be seen that K and Vth are given to I oled Has a certain influence.
Based on the above equation (2), after the threshold voltage Vth compensation is performed on the driving transistor DTFT, the second storage capacitor C2 is charged for a fixed time using the voltage after the Vth compensation, and the obtained voltage value stored in the second storage capacitor C2 (that is, the source potential of the driving transistor DTFT) is in a proportional relationship with the mobility K, so that the mobility K is inversely deduced from the source potential.
After obtaining the threshold voltage Vth and the mobility K of the driving transistor DTFT, a compensated compensation data signal Vdata is obtained, Vdata is F (Vth, K, GL), GL is input video source information, and the compensation data signal Vdata is written into the gate of the driving transistor DTFT to realize characteristic parameter compensation of the driving transistor DTFT.
In some embodiments, the step of obtaining the compensated driving signal generated by each driving transistor DTFT specifically includes:
the input transistor T1 is turned on under the control of the first control signal inputted from the first control signal line Scan; the sensing transistor T2 is turned on under the control of a second control signal inputted from a second control signal line Sense;
inputting a compensation data signal through a data signal line DL, controlling the conduction of a driving transistor DTFT to generate a driving current, and charging a second storage capacitor C2 with the driving current;
after the charging is completed, the voltage value stored in the second storage capacitor C2 is sensed through the sensing signal line SL.
Specifically, the input transistor T1 is turned on under the control of a first control signal inputted through the first control signal line Scan, and the sensing transistor T2 is turned on under the control of a second control signal inputted through the second control signal line Sense; inputting a compensation data signal through a data signal line DL, transmitting the compensation data signal to the gate of the driving transistor DTFT through the input transistor T1, controlling the driving transistor DTFT to be turned on to generate a driving current, and charging the second storage capacitor C2 with the driving current; after the charging of the second storage capacitor C2 is completed, the second control signal controls the sensing transistor T2 to be turned off, the sampling switch SW is closed, and the digital sampler ADC senses the voltage value stored in the second storage capacitor C2 through the sensing signal line SL sensing transistor T2.
It should be noted that, when the driving transistor DTFT corresponds to the driving current I oled Meanwhile, the voltage value stored in the second storage capacitor C2 is the same during the same charging time, and therefore, the driving signal generated by each driving transistor DTFT mentioned in the above embodiments can be specifically the driving current I oled Or the value of the voltage stored by the second storage capacitor C2.
The embodiment of the present invention further provides an image sticking judgment device for a display panel, including:
the compensation acquisition module is used for compensating the characteristic parameters of the driving transistors in each pixel circuit included in the display panel and acquiring driving signals generated by each compensated driving transistor;
the compensation acquisition module is also used for acquiring display brightness information of the display panel after compensation;
and the judging module is used for judging the reason of generating the residual image on the display panel according to the driving signals and the display brightness information generated by the compensated driving transistors. Specifically, the compensation acquisition module generates a corrected compensation data signal by detecting the characteristic parameters of the driving transistor in each pixel circuit, and then inputs the compensation data signal to the driving transistor to realize compensation of the characteristic parameters of the driving transistor, so that the problem of inconsistent display brightness of the display panel caused by different characteristic parameters of the driving transistor in each pixel circuit is solved. After characteristic parameter compensation is carried out on the driving transistors in each pixel circuit included in the display panel, the compensation acquisition module acquires driving signals generated by each driving transistor after compensation. The compensation acquisition module is also used for acquiring display brightness information of the display panel, and the display brightness information reflects the brightness uniformity of the display panel.
After the driving signals generated by the driving transistors after compensation and the display brightness information of the display panel are obtained, the judging module can judge the reason of the afterimage generation of the display panel according to whether the driving signals generated by the driving transistors are consistent or not and the display brightness uniformity of the display panel reflected by the display brightness information.
In the residual image determining device for a display panel provided by the embodiment of the present invention, a compensation obtaining module first compensates characteristic parameters of each driving transistor in a pixel circuit included in the display panel, obtains driving signals generated by each compensated driving transistor, and can determine a compensation condition for each driving transistor according to the driving signals generated by each driving transistor, that is, when the driving signals generated by each driving transistor after compensation are the same, it indicates that there is no driving difference after compensation for each driving transistor, and when the driving signals generated by each driving transistor after compensation are different, it indicates that there is driving difference after compensation for each driving transistor; meanwhile, the compensation acquisition module can continuously acquire the display brightness information of the display panel after compensation, and the display brightness condition of the display panel after compensation can be determined according to the display brightness information; therefore, by combining the driving signal generated after compensation of each driving transistor and the display brightness information of the display panel after compensation, the reason that the display panel generates the afterimage is the difference of the characteristic parameters of each driving transistor or the difference of the efficiency of the light emitting unit.
Therefore, the residual image judging device of the display panel provided by the embodiment of the invention can accurately judge the reason of the residual image generated by the display panel, and can effectively solve the problem of the residual image of the display panel based on the reason.
In more detail, as shown in fig. 2 and 3, the compensation acquisition module may specifically include a timing controller 21, a memory 22, a sensor 20, a source driver 24, a gate driver 23, and the like. The determining module may specifically include a processor. The pixel circuit in the display panel may include: an input transistor T1, a driving transistor DTFT, a sensing transistor T2, a first storage capacitor C1, a second storage capacitor C2; wherein a gate electrode of the input transistor T1 is coupled to the first control signal line Scan, a first electrode of the input transistor T1 is coupled to the data signal line DL, a second electrode of the input transistor T1 is coupled to a gate electrode of the driving transistor DTFT, a first electrode of the driving transistor DTFT is coupled to the power signal line ELVDD, a second electrode of the driving transistor DTFT is coupled to an anode electrode of the corresponding light emitting cell OLED, a cathode electrode of the light emitting cell OLED is coupled to the power negative electrode ELVSS, a first end of the first storage capacitor C1 is coupled to the gate electrode of the driving transistor DTFT, a second end of the first storage capacitor C1 is coupled to the second electrode of the driving transistor DTFT, a gate electrode of the sensing transistor T2 is coupled to the second control signal line Sense, a first electrode of the sensing transistor T2 is coupled to the second electrode of the driving transistor DTFT, and a second electrode of the sensing transistor T2 is coupled to the sensing signal line SL; a first terminal of the second storage capacitor C2 is coupled to the sensing signal line SL, and a second terminal of the second storage capacitor C2 is coupled to the ground signal line. The pixel circuit provided by the above embodiment may further include: a digital sampler ADC, a sampling switch SW for controlling whether the digital sampler ADC is electrically connected with the sensing signal line SL.
In the Blanking stage of the display panel 25 (i.e. the period outside the display frame of the display panel 25, including the VFP (front shoulder of the frame synchronization signal), VW (pulse width of the frame synchronization signal), VBP (back shoulder of the frame synchronization signal) in one frame), from the time of sending the power-on signal to the time of outputting the normal frame, the display panel 25 performs the sensing operation in this period) or the period of displaying the black frame when the power-on is on, the timing controller 21 generates the sensing Data and the source control signal SCS to output to the source driver 24; the timing controller 21 generates a gate control signal GCS to output to the gate driver 23, and obtains sensing data Sdata under cooperation of the gate driver 23 and the source driver 24; compensation data is obtained by data conversion and calculation based on the sensing data Sdata, and is stored in the memory 22, so that the compensation data can be retrieved directly from the memory 22 when used.
In the normal display stage of the display panel, the Timing controller 21 receives RGB Data and Timing Control signal Timing input from the outside, and reads ROM Data (i.e., compensation Data) stored in the memory 22, and the Timing controller 21 generates a compensation Data signal Data and a source Control signal scs (source Control signal) and outputs the compensation Data signal Data and the source Control signal scs (source Control signal) to the source driver 24; the timing controller 21 generates a gate Control signal gcs (gate Control signal) to be output to the gate driver 23, and finally controls the normal output of the screen.
It is worth noting thatThe memory 22 is used for storing characteristic parameters (threshold voltage Vth, mobility K, and the like) of each driving transistor DTFT included in the display panel, and also for storing optical compensation data (a, b) of each light emitting cell in the display panel and a characteristic value (threshold voltage V) of each light emitting cell oled ) And the like; wherein the optical compensation data (a, b) is used for brightness compensation of the display panel.
The sensor 20 can sense information of an ambient temperature, a temperature of the display panel, etc., and the sensor 20 transmits temperature information data based on a temperature change to the timing controller 21.
The source driver 24 is used for receiving the compensation Data signal Data and the source control signal SCS, generating a corresponding Data voltage, and outputting the Data voltage to the display panel through the Data signal line DL; by controlling the source driver 24 and the gate driver 23, in a Blanking stage of display or a black frame display period at power-on, the source driver 24 senses an electrical characteristic value of the driving transistor DTFT through the sensing signal line SL, and generates corresponding sensing data Sdata through the source driver 24 to output to the timing controller 21.
The gate driver 23 receives the gate control signal GCS, generates a corresponding first control signal and a corresponding second control signal, and transmits the corresponding first control signal and the corresponding second control signal to the corresponding first control signal input terminal and the corresponding second control signal input terminal of the display panel through the corresponding first control signal line Scan and the corresponding second control signal line Sense.
In some embodiments, the determining module provided in the foregoing embodiments is specifically configured to:
when the compensated driving signals generated by the driving transistors DTFT are the same and the display luminances of the light emitting units of the display panel displaying luminance information are the same, it is determined that the reason why the display panel generates the afterimage is that the characteristic parameters of the driving transistors DTFT in the pixel circuits are different, and the light emitting units correspond to the pixel circuits one to one.
Specifically, when the driving signals generated by the compensated driving transistors DTFT are the same, it is indicated that the characteristic parameters corresponding to the compensated driving transistors DTFT are the same, and the driving transistors DTFT are accurately compensated, in this case, the display panel is in a display state, and when the obtained display luminance information shows that the display luminances of the light emitting units of the display panel are the same, that is, there is no afterimage on the display panel, it is determined that the reason that the afterimage is generated by the display panel before compensation is that the characteristic parameters of the driving transistors DTFT in each pixel circuit are different, that is, the reason that the afterimage is generated by the display panel before compensation is that the characteristic parameters of the driving transistors DTFT in the backplane included in the display panel drift.
In some embodiments, the determining module provided in the foregoing embodiments is specifically configured to:
when the compensated driving signals generated by the driving transistors DTFT are the same and the display brightness of the light emitting units of the display panel displaying the brightness information is different, it is determined that the reason why the residual image is generated by the display panel is that the light emitting efficiency of the light emitting units of the display panel is different, and the light emitting units correspond to the pixel circuits one to one.
Specifically, when the driving signals generated by the compensated driving transistors DTFT are the same, it is described that the characteristic parameters corresponding to the compensated driving transistors DTFT are the same, the driving transistors DTFT are accurately compensated, and the driving transistors DTFT can generate the same driving current to flow through the light emitting units.
In some embodiments, the determining module provided in the foregoing embodiments is specifically configured to:
when the compensated driving signals generated by the driving transistors DTFT are different and the display brightness of each light-emitting unit of the display panel is different, judging that the reason why the display panel generates the residual image is that the characteristic parameters of the driving transistors DTFT in each pixel circuit are different; and/or judging the reason of generating the residual image on the display panel is that the luminous efficiency of each luminous unit of the display panel is different, and the luminous units are in one-to-one correspondence with the pixel circuits.
Specifically, when the driving signals generated by the compensated driving transistors DTFT are different, it is described that the characteristic parameters corresponding to the compensated driving transistors DTFT are different, and the driving transistors DTFT are not accurately compensated, in this case, the display panel is in a display state, and when the obtained display luminance information indicates that the display luminances of the light emitting units of the display panel are different, that is, the display panel generates an afterimage, it can be determined that the reason why the display panel generates the afterimage is that the characteristic parameters of the driving transistors DTFT in each pixel circuit are different; and/or judging that the reason for generating the afterimage on the display panel is that the luminous efficiency of each luminous unit of the display panel is different.
It should be noted that theoretically, after compensation is performed on each driving transistor DTFT, driving signals generated by each driving transistor DTFT should be the same, and if they are not equal, it indicates that each driving transistor DTFT is not accurately compensated, and at this time, elimination of afterimages and reason determination also require improvement of external compensation capability; in addition, when the driving transistors DTFT are not accurately compensated for, the reason why the display panel generates the afterimage depends on the change of the characteristic parameters of the driving transistors DTFT, and whether the afterimage depends on the light emitting efficiency of the light emitting unit cannot be excluded.
In some embodiments, the compensation acquiring module provided in the above embodiments is further configured to optically compensate each light emitting unit included in the display panel, so that the light emitting efficiency of each light emitting unit included in the display panel is the same.
The embodiment of the invention also provides display equipment which comprises the residual image judging device of the display panel provided by the embodiment.
The display device provided by the embodiment of the invention has the same effect when the afterimage distinguishing device of the display panel is included, because the afterimage distinguishing device of the display panel can accurately distinguish the reason of the afterimage generated by the display panel and can more effectively solve the afterimage problem of the display panel based on the reason.
It should be noted that the display device may be: any product or component with a display function, such as a television, a display, a digital photo frame, a mobile phone, a tablet computer and the like.
It should be noted that, in the present specification, all the embodiments are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the product embodiments, since they are substantially similar to the method embodiments, they are described simply, and reference may be made to some descriptions of the product embodiments for relevant points.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A method for determining an afterimage of a display panel includes:
performing characteristic parameter compensation on driving transistors in each pixel circuit included in the display panel, and acquiring driving signals generated by each compensated driving transistor;
acquiring display brightness information of the compensated display panel;
judging the reason of generating the residual image of the display panel according to the driving signals generated by the driving transistors after compensation and the display brightness information;
the step of determining the reason for the display panel to generate the afterimage according to the driving signal generated by each compensated driving transistor and the display brightness information specifically includes:
when the compensated driving signals generated by the driving transistors are the same and the display brightness of the light-emitting units of the display brightness information display panel is the same, the reason that the display panel generates the residual image is judged to be that the characteristic parameters of the driving transistors in the pixel circuits are different, and the light-emitting units correspond to the pixel circuits one to one.
2. The method as claimed in claim 1, wherein the step of determining the reason for the display panel generating the afterimage according to the compensated driving signals generated by the driving transistors and the display luminance information specifically comprises:
when the compensated driving signals generated by the driving transistors are the same and the display brightness of the light emitting units of the display brightness information display panel is different, the reason that the display panel generates the residual image is judged to be that the light emitting efficiency of the light emitting units of the display panel is different, and the light emitting units correspond to the pixel circuits one to one.
3. The method as claimed in claim 1, wherein the step of determining the reason for the display panel generating the afterimage according to the compensated driving signals generated by the driving transistors and the display luminance information specifically comprises:
when the compensated driving signals generated by the driving transistors are different and the display brightness of each light-emitting unit of the display brightness information display panel is different, judging that the reason why the display panel generates the residual image is that the characteristic parameters of the driving transistors in each pixel circuit are different; and/or judging the reason why the display panel generates the residual image is that the luminous efficiency of each luminous unit of the display panel is different, and the luminous units are in one-to-one correspondence with the pixel circuits.
4. The method of claim 2 or 3, wherein when it is determined that the reason why the afterimage is generated on the display panel is that the light emission efficiencies of the light emitting units of the display panel are different, the method further comprises:
and optically compensating each light-emitting unit included in the display panel so that the light-emitting efficiency of each light-emitting unit included in the display panel is the same.
5. The method of claim 1, wherein the pixel circuit comprises: the driving circuit comprises an input transistor, a driving transistor, a sensing transistor, a first storage capacitor and a second storage capacitor; wherein a gate of the input transistor is coupled to a first control signal line, a first pole of the input transistor is coupled to a data signal line, a second pole of the input transistor is coupled to a gate of a driving transistor, a first pole of the driving transistor is coupled to a power signal line, a second pole of the driving transistor is coupled to a corresponding light emitting cell, a first end of the first storage capacitor is coupled to the gate of the driving transistor, a second end of the first storage capacitor is coupled to the second pole of the driving transistor, a gate of the sensing transistor is coupled to a second control signal line, a first pole of the sensing transistor is coupled to the second pole of the driving transistor, and a second pole of the sensing transistor is coupled to a sensing signal line; the first end of the second storage capacitor is coupled with a sensing signal line, and the second end of the second storage capacitor is coupled with a ground signal line;
the step of obtaining the driving signal generated by each compensated driving transistor specifically includes:
the input transistor is turned on under the control of a first control signal inputted from the first control signal line; the sensing transistor is turned on under the control of a second control signal inputted from the second control signal line;
inputting a compensation data signal through the data signal line, controlling the drive transistor to be conducted to generate a drive current, and charging the second storage capacitor by using the drive current;
and after the charging is finished, sensing the voltage value stored by the second storage capacitor through the sensing signal line.
6. An afterimage discrimination apparatus for a display panel, comprising:
the compensation acquisition module is used for compensating characteristic parameters of driving transistors in each pixel circuit included in the display panel and acquiring driving signals generated by each compensated driving transistor;
the compensation acquisition module is also used for acquiring display brightness information of the compensated display panel;
the judging module is used for judging the reason of generating the residual image of the display panel according to the driving signals generated by the compensated driving transistors and the display brightness information;
the judging module is specifically configured to:
when the compensated driving signals generated by the driving transistors are the same and the display brightness of the light-emitting units of the display brightness information display panel is the same, the reason that the display panel generates the residual image is judged to be that the characteristic parameters of the driving transistors in the pixel circuits are different, and the light-emitting units correspond to the pixel circuits one to one.
7. The apparatus of claim 6, wherein the determining module is specifically configured to:
when the compensated driving signals generated by the driving transistors are the same and the display brightness of the light-emitting units of the display panel for displaying brightness information is different, the reason that the display panel generates the residual image is judged to be that the light-emitting efficiency of the light-emitting units of the display panel is different, and the light-emitting units correspond to the pixel circuits one to one.
8. The apparatus of claim 6, wherein the determining module is specifically configured to:
when the compensated driving signals generated by the driving transistors are different and the display brightness of each light-emitting unit of the display brightness information display panel is different, judging that the reason why the display panel generates the residual image is that the characteristic parameters of the driving transistors in each pixel circuit are different; and/or judging the reason why the display panel generates the residual image is that the luminous efficiency of each luminous unit of the display panel is different, and the luminous units are in one-to-one correspondence with the pixel circuits.
9. A display device comprising the afterimage discrimination device of the display panel according to any one of claims 6 to 8.
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