CN112967679B - Display compensation device and method and display device - Google Patents
Display compensation device and method and display device Download PDFInfo
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- CN112967679B CN112967679B CN202110293013.2A CN202110293013A CN112967679B CN 112967679 B CN112967679 B CN 112967679B CN 202110293013 A CN202110293013 A CN 202110293013A CN 112967679 B CN112967679 B CN 112967679B
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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]
Abstract
The present disclosure relates to the field of display technologies, and in particular, to a display compensation apparatus and method, and a display apparatus, wherein the display compensation apparatus includes: the pixel circuit is connected with the light-emitting unit and used for driving the light-emitting unit to emit light; the sensing circuit is connected with the pixel circuit and used for sensing the driving current line by line; the gate driving circuit is connected with the sensing circuit and used for providing gate driving signals to the sensing circuit row by row; when the display compensation device works in a display compensation mode, the grid drive circuit outputs a grid drive signal at a first frequency, and when the display compensation device works in a transition mode, the grid drive circuit outputs a grid drive signal at a second frequency, wherein the second frequency is higher than the first frequency. The compensation accuracy of the display compensation device can be improved.
Description
Technical Field
The disclosure relates to the technical field of display, in particular to a display compensation device and method and a display device.
Background
In an OLED (Organic Light Emitting Diode) display device, a Light Emitting element is driven by a current to emit Light, and in an OLED display panel, mobility and threshold voltage of a plurality of driving transistors may be non-uniform due to a manufacturing process or the like. In order to make the display luminance uniform on the display surface, the threshold voltage and mobility of the driving transistor are usually compensated. The compensation includes internal compensation and external compensation, and the threshold voltage and mobility of the driving transistor are sensed by the sensing circuit when the external compensation is performed. The external compensation usually includes a display compensation mode and a shutdown compensation mode, the display compensation apparatus switches from the display compensation mode to the shutdown compensation mode, and if the display compensation mode scans the last line but not the last line, the two lines of sensing circuits may be simultaneously turned on in the shutdown compensation mode, so that an error may exist in a shutdown mode sensing signal.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The present disclosure provides a display compensation apparatus and method, and a display apparatus, so as to improve the accuracy of a sensing signal at least to a certain extent.
According to a first aspect of the present disclosure, there is provided a display compensation apparatus comprising:
the pixel circuits of the N rows are connected with the light-emitting units and used for driving the light-emitting units to emit light;
the sensing circuit is connected with the pixel circuit and used for sensing the driving current line by line;
the grid driving circuit is connected with the sensing circuit and is used for providing grid driving signals to the sensing circuit row by row;
the display compensation device is provided with a display compensation mode, a transition mode and a shutdown compensation mode, wherein the transition mode is arranged between the display compensation mode and the shutdown compensation mode, when the display compensation device works in the display compensation mode, the grid drive circuit outputs a grid drive signal at a first frequency, when the display compensation device works in the transition mode, the grid drive circuit outputs a grid drive signal at a second frequency so that N rows of the sensing circuits scan to the last row, the second frequency is greater than the first frequency, and N is a positive integer greater than or equal to 2.
According to an embodiment of the present disclosure, the number of active levels in the transition mode gate driving signal is greater than N.
According to an embodiment of the present disclosure, in the transition mode, after the gate driving signal of the second frequency is scanned to the sensing circuit of the nth row, the gate driving circuit and the sensing circuit are disconnected.
According to an embodiment of the present disclosure, the gate driving circuit includes:
a first drive sub-circuit connected to the sense circuit for providing a gate signal to the sense circuit in the display compensation mode and the transition mode;
a second drive sub-circuit connected to the sense circuit for providing a gate signal to the sense circuit in the shutdown compensation mode.
According to an embodiment of the present disclosure, in the transition mode, after the gate driving signal of the second frequency is scanned to the sensing circuit of the nth row, the first driving sub-circuit and the sensing circuit are turned off.
According to a second aspect of the present disclosure, there is provided a display compensation method for the above display compensation apparatus, the display compensation method comprising:
receiving a shutdown compensation signal in a display compensation mode, wherein a sensing circuit receives a grid signal of a first frequency in the display compensation mode;
responding to the shutdown compensation signal to switch from a display compensation mode to a transition mode, wherein the sensing circuit receives a grid signal of a second frequency in the transition mode, and the second frequency is greater than the first frequency;
and switching the transition mode to a shutdown compensation mode to perform shutdown compensation.
According to an embodiment of the present disclosure, after receiving the shutdown compensation signal, the display compensation method further includes:
and responding to the control signal to drive the display device to display at least one frame of black picture.
According to an embodiment of the present disclosure, the number of active levels in the transition mode gate driving signal is greater than N.
According to an embodiment of the present disclosure, in the transition mode, after the gate driving signal of the second frequency is scanned to the sensing circuit of the nth row, the gate driving circuit and the sensing circuit are disconnected.
According to a third aspect of the present disclosure, there is provided a display device comprising the above display compensation device.
The display compensation device provided by the embodiment of the disclosure sets the transition mode when the display compensation mode and the shutdown compensation mode are switched, and rapidly moves the scanning sensing circuit of the display compensation mode to the last line through the gate driving signal of the second frequency greater than the first frequency in the transition mode, so as to avoid simultaneously opening two lines of sensing units in the shutdown compensation mode, and further improve the compensation precision of the shutdown compensation mode.
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 disclosure.
Drawings
The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a schematic block diagram of a display compensation apparatus provided in an exemplary embodiment of the present disclosure;
FIG. 2 is a diagram illustrating a display compensation apparatus according to an exemplary embodiment of the present disclosure;
fig. 3 is a circuit diagram of a display compensation apparatus according to an exemplary embodiment of the present disclosure;
FIG. 4 is a timing diagram illustrating a compensation mode provided by an exemplary embodiment of the present disclosure;
FIG. 5 is a timing diagram illustrating a shutdown compensation mode according to an exemplary embodiment of the disclosure;
FIG. 6 is a flowchart of a display compensation method provided by an exemplary embodiment of the present disclosure;
FIG. 7 is a flow chart of another display compensation method provided by exemplary embodiments of the present disclosure;
fig. 8 is a schematic diagram of a display device according to an exemplary embodiment of 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 embodiments 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 denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other methods, components, materials, devices, steps, and so forth. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in the form of software, or in one or more software-hardened modules, or in different networks and/or processor devices and/or microcontroller devices.
The OLED display device comprises a light emitting element connected with a driving circuit, wherein the driving circuit supplies a driving current to the light emitting element, and the driving circuit comprises a driving transistor. There is a problem that threshold voltages and mobilities of the plurality of driving transistors are not uniform due to a manufacturing process or the like. The non-uniformity of the transistors may cause different luminance levels of different pixel units when displaying the same gray-scale image, thereby affecting the display effect of the display device.
To solve this problem, the driving transistor is usually compensated. The compensation includes internal compensation and external compensation, and the external compensation senses the threshold voltage and mobility of the driving transistor through the display compensation device and compensates the driving current according to the mobility and threshold voltage of the driving transistor.
The display device can comprise N rows of light-emitting elements, each light-emitting element is correspondingly connected with one pixel circuit, and the N rows of pixel circuits can drive the light-emitting elements to emit light in a row-by-row scanning mode. When the display device displays, the time of one frame of picture may include a scanning period in which the display panel is scanned line by line and a blank (blank) period in which the light emitting elements emit light. The blank period is a time when the display panel scan is switched from the last row (last row of the previous frame) to the first row (first row of the next frame), and can be used for sensing the mobility and threshold voltage of the driving transistor. And sensing the mobility and the threshold voltage of the driving transistor during display, and compensating the mobility and the threshold voltage of the driving transistor, wherein the compensation is a display compensation mode. When the display device does not emit light, for example, an electronic apparatus provided with the display device is in a standby state or a shutdown state, the shutdown compensation mode is to compensate for the threshold voltage and the mobility of the driving transistor.
First, an exemplary embodiment of the present disclosure is directed to a display compensation apparatus, as shown in fig. 1 and 2, including: the pixel circuit 110, the sensing circuit 120 and the gate driving circuit 130 in N rows, the pixel circuit 110 is connected with a light emitting unit (OLED) for driving the light emitting unit to emit light; the sensing circuit 120 is connected to the pixel circuit 110 for sensing the driving current row by row; the gate driving circuit 130 is connected to the sensing circuit 120, and is configured to provide gate driving signals to the sensing circuit 120 row by row;
the display compensation device has a display compensation mode, a transition mode and a shutdown compensation mode, the transition mode is set between the display compensation mode and the shutdown compensation mode, when the display compensation device works in the display compensation mode, the gate driving circuit 130 outputs the gate driving signal at a first frequency, and when the display compensation device works in the transition mode, the gate driving circuit 130 outputs the gate driving signal at a second frequency, so that the N rows of sensing circuits 120 scan to a last row, the second frequency is greater than the first frequency, and N is a positive integer greater than or equal to 2.
The transition mode is set between the display compensation mode and the power-off compensation mode, which means that the transition mode is set between the display compensation mode and the power-off compensation mode in terms of time sequence. That is, the display apparatus needs to go through the transition mode when switching from the display compensation mode to the shutdown compensation mode. In the transition mode, no sensing signal is acquired, or the sensing signal acquired in the transition mode is subjected to invalidation processing.
The display compensation device provided by the embodiment of the present disclosure sets the transition mode when the display compensation mode and the shutdown compensation mode are switched, and rapidly moves the scanning sensing circuit 120 in the display compensation mode to the last line through the gate driving signal with the second frequency greater than the first frequency in the transition mode, so as to avoid simultaneously turning on two lines of sensing units in the shutdown compensation mode, and further improve the compensation accuracy in the shutdown compensation mode.
The following will explain the components of the display compensation device provided in the embodiments of the present disclosure in detail:
as shown in fig. 3, the pixel circuit 110 may include a driving transistor DT, a scanning switching transistor TK, and an energy storage capacitor C, a first terminal of the driving transistor DT being connected to a first power source terminal, a second terminal of the driving transistor DT being connected to a light emitting element, and a second terminal of the light emitting element being connected to a second power source terminal. The first end of the TK is connected with the data signal end, the second end of the TK is connected with the control end of the DT, and the control end of the TK is connected with the first scanning signal end. The first end of the energy storage capacitor C is connected with the control end of the driving transistor DT, and the second end of the energy storage capacitor C is connected with the second end of the driving transistor DT.
The data signal terminal outputs a data signal, the first scan signal terminal outputs a first scan signal, the first power terminal outputs a first power signal (a high level signal VDD), and the second signal terminal may be a ground terminal. In the data writing stage, the scanning switch transistor TK is conducted in response to a first scanning signal to write a data signal into the energy storage capacitor C; the driving transistor DT is turned on in response to the data signal in the energy storage capacitor C during the light emitting period, thereby forming a driving current to drive the light emitting element to emit light.
Of course, in practical applications, the pixel circuit 110 may further include an internal compensation sub-circuit for compensating the threshold voltage of the driving transistor DT. For example, the compensation sub-circuit may be connected to the control terminal and the second terminal of the driving transistor DT, respectively. The compensation sub-circuit may comprise a compensation transistor, a first terminal of the compensation transistor is connected to the control terminal of the driving transistor DT, a second terminal of the compensation transistor is connected to the second terminal of the driving transistor DT, and the control terminal of the compensation transistor is connected to the energy storage capacitor C. It should be noted that the compensation sub-circuit may also have other structures, and the embodiment of the present disclosure is not particularly limited thereto.
The pixel circuit 110 may further include a first light-emitting control transistor and a second light-emitting control transistor, wherein a first end of the first light-emitting control transistor is connected to the first power terminal, a second end of the first light-emitting control transistor is connected to the first end of the driving transistor DT, and a control end of the first light-emitting control transistor is connected to the light-emitting control terminal. The first end of the second light-emitting control transistor is connected with the second end of the driving transistor DT, the second end of the second light-emitting control transistor is connected with the light-emitting element, and the control end of the second light-emitting control transistor is connected with the light-emitting control end. The light emitting control end outputs a light emitting control signal, and the first light emitting control transistor and the second light emitting control transistor are conducted in response to the light emitting control signal in a light emitting stage.
The display device may have N rows of light emitting cells and M columns of light emitting cells in each row. That is, M × N light emitting units may be provided in the display device. Accordingly, the display compensation apparatus may include M × N pixel circuit 110 units. The M × N pixel circuit 110 units scan line by line to realize line-by-line charging.
The sensing circuit 120 may include a sensing transistor TS having a first terminal connected to the second terminal of the driving transistor DT, a control terminal connected to the second scan signal terminal, and a second terminal connected to the sensing signal line. The second scanning signal terminal outputs a second scanning signal, and the sensing transistor TS is turned on in response to the second scanning signal to transmit a second terminal signal of the driving transistor DT to the sensing line SL.
As shown in FIG. 4, in the display compensation mode, G1 turns on the scanning switch transistor TK, the data signal Vdata is written into the energy storage capacitor, and the sensing transistor TS responds to the turning on of G2 to sense the signal at the second terminal of the driving transistor. The sensing signal may be output through the sensing line SL.
The sensing circuit 120 may sense a signal of the second terminal of the driving transistor DT in the display compensation mode and the shutdown compensation mode. In the display compensation mode, when a frame is displayed, an effective scanning level is output from the second scanning signal terminal in the blank period, and the sensing transistor TS is turned on in response to the effective scanning level to collect the sensing signal in the blank period. Of course, in practical applications, the second scan signal terminal may also output a plurality of effective scan levels in the blank period of one frame display, and the embodiment of the disclosure is not limited thereto.
In the shutdown compensation mode, the display device does not display a frame, and the sensing transistor TS may be controlled by the first scan signal. That is, the control terminal of the sensing transistor TS receives the first scan signal, and the sensing transistor TS senses the signal of the second terminal of the driving transistor DT row by row in response to the first scan signal.
The gate driving circuit 130 may include a shift register 131, and the shift register 131 outputs a gate signal, for example, the shift register 131 may output a first scan signal and a second scan signal. For example, the shift register 131 may include N shift register 131 units, the shift register 131 units may be connected in sequence, and each shift register 131 unit is connected to a row of pixel circuits 110 and a corresponding sensing circuit 120.
The shift register 131 unit may have a first scan signal terminal and a second scan signal terminal. The first scan signal terminal of the shift register 131 unit may be connected with a first switching circuit, and the first switching circuit is connected with the control terminal of the scan switch transistor TK and the control terminal of the sensing transistor TS. The first switching circuit conducts a first scanning signal end and a control end of a scanning switch transistor TK when the compensation mode is displayed; the first switching circuit conducts the first scanning signal terminal and the control terminal of the sensing transistor TS in the shutdown compensation mode. The second scanning signal end is connected with the second switching circuit, the second switching circuit is connected with the control end of the sensing transistor TS, the second switching circuit conducts the second scanning signal end and the control end of the sensing transistor TS when the compensation mode is displayed, and the second switching circuit shuts off the second scanning signal end and the control end of the sensing transistor TS when the compensation mode is shut down.
The first switching circuit may include a first switch and a second switch, the first switch being connected to the first scan signal terminal and the control terminal of the scan switching transistor TK, respectively, and the second switch being connected to the first scan signal terminal and the control terminal of the sensing transistor TS, respectively. When the compensation mode is displayed, the first switch is switched on, and the second switch is switched off; and the first switch is switched off and the second switch is switched on in the shutdown compensation mode.
The second switching circuit may include a third switch, the third switch is respectively connected to the second scanning signal terminal and the control terminal of the sensing transistor TS, the third switch is turned on when the compensation mode is displayed, and the third switch is turned off when the compensation mode is turned off.
When the display compensation device is switched from the display compensation mode to the shutdown compensation mode, the display compensation device has a transition mode, when the display compensation device works in the display compensation mode, the gate driving circuit 130 outputs the gate driving signal at a first frequency, and when the display compensation device works in the transition mode, the gate driving circuit 130 outputs the gate driving signal at a second frequency, so that the N rows of sensing circuits 120 scan to the last row, wherein the second frequency is greater than the first frequency.
The gate driving signal of the transition mode sensing circuit 120 has a second frequency, and the second frequency is greater than the first frequency. The second frequency may be a multiple of the first frequency. For example, the second frequency may be 10 times, 15 times, 20 times, etc. of the first frequency, which is not particularly limited in the embodiments of the present disclosure.
As shown in fig. 5, the gate driving circuit may output a pulse signal (YDIO), a shift signal clock (yclk), and an output signal (YOE). The shift signal YCLK may be provided to the sensing circuit to drive the sensing circuit to scan line by line. The time period t0 in the figure is the transition mode, and t0 is preceded by the display compensation phase. It can be seen from the figure that the frequency of the gate signal (second frequency) in the transition mode is greater than the frequency (first frequency) of the display compensation mode.
In the transition mode, the gate driving signal of the second frequency can rapidly drive the multi-row sensing circuit 120 to scan, so that the scanning row of the sensing cells is rapidly moved to the last row, and the scanning signal is removed when the scanning row of the sensing cells is moved to the sensing cells of the last row.
The control terminal of the sensing transistor TS is connected to the gate driving circuit 130, and the gate driving circuit 130 outputs a gate signal of a second frequency in the transition mode, where the gate signal of the second frequency may be referred to as a third scan signal. The gate driving circuit 130 may have a third scan signal terminal provided therein, and the third scan signal terminal outputs a third scan signal. Of course, in practical applications, the third scan signal may be shared with the first scan signal, that is, the first scan signal terminal and the control terminal of the sensing transistor TS may be connected in the transition mode.
The number of active levels in the transition mode gate drive signal is greater than N. For example, the active level of the gate driving signal is high, that is, the sensing transistor TS is turned on in response to the high level signal. When the compensation mode is displayed, the grid driving signal is the second scanning signal, and when the compensation mode is displayed, the grid driving signal is the third scanning signal. The number of active levels in a transition mode in the third scan signal is greater than N to ensure that the scan line can be shifted out by the third scan signal when the display compensation mode stops at any line.
In a possible embodiment of the present disclosure, after the gate driving signal of the second frequency is scanned to the nth row sensing circuit 120 in the transition mode, the gate driving circuit 130 and the sensing circuit 120 are turned off. That is, the shifting out of the scan line is achieved by turning off the gate driving circuit 130 and the sensing circuit 120. A trigger circuit may be connected to the sensing circuit 120 of the last row, and the trigger circuit is triggered and outputs a trigger signal in response to which the gate driving circuit 130 is disconnected from the sensing circuit 120 when the sensing circuit 120 of the last row is scanned in the transition mode. When the display device enters the shutdown compensation mode, the gate driving circuit 130 and the sensing circuit 120 may be turned on again.
Here, a display compensation switch may be disposed between the control terminal of the sensing transistor TS and the gate driving circuit 130, and the display compensation switch is turned off when the trigger circuit is triggered.
In another possible embodiment of the present disclosure, the gate driving circuit 130 includes a first driving sub-circuit and a second driving sub-circuit, the first driving sub-circuit is connected to the sensing circuit 120 for providing the gate signal to the sensing circuit 120 in the display compensation mode and the transition mode; the second driving sub-circuit is connected to the sensing circuit 120 for providing a gate signal to the sensing circuit 120 during the shutdown compensation mode.
Wherein the first driving sub-circuit transmits a gate signal, which may include the second scan signal and the third scan signal, to the control terminal of the sensing transistor TS in the display compensation mode and the transition mode. The first driving sub-circuit outputs a second scan signal in the display compensation mode and outputs a third scan signal in the transition mode.
In the transition mode, after the gate driving signal (third scanning signal) with the second frequency is scanned to the nth row sensing circuit 120, the first driving sub-circuit and the sensing circuit 120 are disconnected. For example, a trigger circuit may be connected to the sensing circuit 120 of the last row, and when the sensing circuit 120 of the last row is scanned in the transition mode, the trigger circuit is triggered and outputs a trigger signal, and the first driving sub-circuit is disconnected from the sensing circuit 120 in response to the trigger signal.
The second driving sub-circuit transmits a gate signal to the control terminal of the sensing transistor TS in the shutdown compensation mode, the gate signal being used to scan the sensing unit in the shutdown mode, so that the sensing circuit 120 can acquire the mobility and the threshold voltage of the driving transistor DT. For example, the gate driving signal may include a first scan signal.
When the display device enters the transition mode from the display mode, the display device can be controlled to display the black picture of at least two frames so as to avoid the display device from displaying the afterimage. The display of the black screen may set the data signal to a voltage corresponding to the black data signal.
It should be noted that, in the embodiment of the present disclosure, each transistor has a control terminal, a first terminal, and a second terminal. Specifically, the control terminal of each transistor may be a gate, the first terminal may be a source, and the second terminal may be a drain; alternatively, the control terminal of each transistor may be a gate, the first terminal may be a drain, and the second terminal may be a source. In addition, each transistor may be an N-type transistor or a P-type transistor, or each transistor may be an enhancement-type transistor or a depletion-type transistor, which is not particularly limited in this example embodiment.
The display compensation device provided by the embodiment of the present disclosure sets the transition mode when the display compensation mode and the shutdown compensation mode are switched, and rapidly moves the scanning sensing circuit 120 in the display compensation mode to the last line through the gate driving signal with the second frequency greater than the first frequency in the transition mode, so as to avoid simultaneously turning on two lines of sensing units in the shutdown compensation mode, and further improve the compensation accuracy in the shutdown compensation mode.
The exemplary embodiment of the present disclosure also provides a display compensation method, which is used in the above display compensation apparatus, as shown in fig. 6, the display compensation method may include the following steps:
step S610, receiving the shutdown compensation signal in the display compensation mode, and receiving the gate signal of the first frequency by the sensing circuit 120 in the display compensation mode;
step S620, switching from the display compensation mode to the transition mode in response to the shutdown compensation signal, wherein the sensing circuit 120 receives a gate signal of a second frequency in the transition mode, and the second frequency is greater than the first frequency;
in step S630, the transition mode is switched to the shutdown compensation mode for shutdown compensation.
According to the display compensation method provided by the embodiment of the disclosure, the transition mode is set when the display compensation mode and the shutdown compensation mode are switched, and the scanning sensing circuit 120 in the display compensation mode is rapidly moved to the last row in the transition mode through the gate driving signal with the second frequency greater than the first frequency, so that two rows of sensing units are prevented from being simultaneously turned on in the shutdown compensation mode, and the compensation precision of the shutdown compensation mode can be improved.
Further, as shown in fig. 7, the display compensation method provided by the embodiment of the present disclosure may further include the following steps:
step S640, driving the display device to display at least one frame of black image in response to the control signal.
Wherein step S640 may be performed between step S610 and step S620.
The following will describe each part of the display compensation method provided by the embodiment of the present disclosure in detail:
in step S610, the shutdown compensation signal may be received in the display compensation mode, and the sensing circuit 120 receives the gate signal of the first frequency in the display compensation mode.
The shutdown compensation signal is used for controlling the display compensation device to switch from the display compensation mode to the shutdown compensation mode. The shutdown compensation signal may be sent from the SOC (system on chip) to the TCON (timing controller) terminal. The shutdown compensation signal may be triggered by a user screen locking operation or may be triggered by a user shutdown of the electronic device.
In step S620, the display compensation mode may be switched to a transition mode in response to the shutdown compensation signal, in which the sensing circuit 120 receives a gate signal of a second frequency, the second frequency being greater than the first frequency.
When the display compensation device is switched from the display compensation mode to the shutdown compensation mode, the gate driving circuit 130 outputs the gate driving signal at a first frequency, and when the display compensation device is in the display compensation mode, the gate driving circuit 130 outputs the gate driving signal at a second frequency, so that the N rows of sensing circuits 120 scan to the last row, where the second frequency is greater than the first frequency.
The gate driving signal of the transition mode sensing circuit 120 has a second frequency, and the second frequency is greater than the first frequency. The second frequency may be a multiple of the first frequency. For example, the second frequency may be 10 times, 15 times, 20 times, etc. of the first frequency, which is not particularly limited in the embodiments of the present disclosure.
In the transition mode, the gate driving signal of the second frequency can rapidly drive the multi-row sensing circuit 120 to scan, so that the scanning row of the sensing cells is rapidly moved to the last row, and the scanning signal is removed when the scanning row of the sensing cells is moved to the sensing cells of the last row.
The control terminal of the sensing transistor TS is connected to the gate driving circuit 130, and the gate driving circuit 130 outputs a gate signal of a second frequency in the transition mode, where the gate signal of the second frequency may be referred to as a third scan signal. The gate driving circuit 130 may have a third scan signal terminal provided therein, and the third scan signal terminal outputs a third scan signal. Of course, in practical applications, the third scan signal may be shared with the first scan signal, that is, the first scan signal terminal and the control terminal of the sensing transistor TS may be connected in the transition mode.
The number of active levels in the transition mode gate drive signal is greater than N. For example, the active level of the gate driving signal is high, that is, the sensing transistor TS is turned on in response to the high level signal. When the compensation mode is displayed, the grid driving signal is the second scanning signal, and when the compensation mode is displayed, the grid driving signal is the third scanning signal. The number of active levels in a transition mode in the third scan signal is greater than N to ensure that the scan line can be shifted out by the third scan signal when the display compensation mode stops at any line.
In a possible embodiment of the present disclosure, after the gate driving signal of the second frequency is scanned to the nth row sensing circuit 120 in the transition mode, the gate driving circuit 130 and the sensing circuit 120 are turned off. That is, the shifting out of the scan line is achieved by turning off the gate driving circuit 130 and the sensing circuit 120. A trigger circuit may be connected to the sensing circuit 120 of the last row, and the trigger circuit is triggered and outputs a trigger signal in response to which the gate driving circuit 130 is disconnected from the sensing circuit 120 when the sensing circuit 120 of the last row is scanned in the transition mode. When the display device enters the shutdown compensation mode, the gate driving circuit 130 and the sensing circuit 120 may be turned on again.
Here, a display compensation switch may be disposed between the control terminal of the sensing transistor TS and the gate driving circuit 130, and the display compensation switch is turned off when the trigger circuit is triggered.
In another possible embodiment of the present disclosure, the gate driving circuit 130 includes a first driving sub-circuit and a second driving sub-circuit, the first driving sub-circuit is connected to the sensing circuit 120 for providing the gate signal to the sensing circuit 120 in the display compensation mode and the transition mode; the second driving sub-circuit is connected to the sensing circuit 120 for providing a gate signal to the sensing circuit 120 during the shutdown compensation mode.
Wherein the first driving sub-circuit transmits a gate signal, which may include the second scan signal and the third scan signal, to the control terminal of the sensing transistor TS in the display compensation mode and the transition mode. The first driving sub-circuit outputs a second scan signal in the display compensation mode and outputs a third scan signal in the transition mode.
In the transition mode, after the gate driving signal (third scanning signal) with the second frequency is scanned to the nth row sensing circuit 120, the first driving sub-circuit and the sensing circuit 120 are disconnected. For example, a trigger circuit may be connected to the sensing circuit 120 of the last row, and when the sensing circuit 120 of the last row is scanned in the transition mode, the trigger circuit is triggered and outputs a trigger signal, and the first driving sub-circuit is disconnected from the sensing circuit 120 in response to the trigger signal.
The second driving sub-circuit transmits a gate signal to the control terminal of the sensing transistor TS in the shutdown compensation mode, the gate signal being used to scan the sensing unit in the shutdown mode, so that the sensing circuit 120 can acquire the mobility and the threshold voltage of the driving transistor DT. For example, the gate driving signal may include a first scan signal.
In step S630, the transition mode may be switched to the shutdown compensation mode for shutdown compensation.
When the transition mode scans to the sensing circuit 120 in the last row, the transition mode is ended, and the display compensation apparatus is switched to the shutdown compensation mode. In the shutdown compensation mode, the sensing circuit 120 senses a signal at the second terminal of the driving transistor DT, thereby determining the mobility and the threshold voltage of the driving transistor DT.
In step S640, the display device may be driven to display at least one frame of black picture in response to the control signal.
When the display device enters the transition mode from the display mode, the display device can be controlled to display a black picture of at least one frame so as to avoid the display device from displaying afterimages. The display of the black screen may set the data signal to a voltage corresponding to the black data signal.
According to the display compensation method provided by the embodiment of the disclosure, the transition mode is set when the display compensation mode and the shutdown compensation mode are switched, and the scanning sensing circuit 120 in the display compensation mode is rapidly moved to the last row in the transition mode through the gate driving signal with the second frequency greater than the first frequency, so that two rows of sensing units are prevented from being simultaneously turned on in the shutdown compensation mode, and the compensation precision of the shutdown compensation mode can be improved.
It should be noted that although the various steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that these steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
The present exemplary embodiment also provides a display apparatus 10, as shown in fig. 8, the display apparatus 10 includes the above-described display compensation apparatus 100.
The display compensation device 100 comprises an N-row pixel circuit 110, an N-row sensing circuit 120 and a gate driving circuit 130, wherein the pixel circuit 110 is connected with a light emitting unit and is used for driving the light emitting unit to emit light; the sensing circuit 120 is connected to the pixel circuit 110 for sensing the driving current row by row; the gate driving circuit 130 is connected to the sensing circuit 120, and is configured to provide gate driving signals to the sensing circuit 120 row by row;
the display compensation apparatus 100 has a display compensation mode and a shutdown compensation mode, the display compensation apparatus 100 has a transition mode when the display compensation apparatus 100 switches from the display compensation mode to the shutdown compensation mode, when the display compensation apparatus 100 operates in the display compensation mode, the gate driving circuit 130 outputs the gate driving signal at a first frequency, and when the display compensation apparatus 100 operates in the transition mode, the gate driving circuit 130 outputs the gate driving signal at a second frequency, so that the N rows of the sensing circuits 120 scan to a last row, the second frequency is greater than the first frequency, and N is a positive integer greater than or equal to 2.
The display device provided by the embodiment of the disclosure sets the transition mode when the display compensation mode and the shutdown compensation mode are switched, and rapidly moves the scanning sensing circuit 120 in the display compensation mode to the last line through the gate driving signal with the second frequency greater than the first frequency in the transition mode, so as to avoid simultaneously turning on two lines of sensing units in the shutdown compensation mode, and further improve the compensation precision of the shutdown compensation mode.
The display device may include any product or component with a display function, such as a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, and a navigator. The specific details of each circuit in the display device have been described in detail in the corresponding pixel driving circuit, and therefore are not described herein again.
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 (10)
1. A display compensation apparatus, comprising:
the pixel circuits of the N rows are connected with the light-emitting units and used for driving the light-emitting units to emit light;
the sensing circuit is connected with the pixel circuit and used for sensing the driving current line by line;
the grid driving circuit is connected with the sensing circuit and is used for providing grid driving signals to the sensing circuit row by row;
the display compensation device is provided with a display compensation mode, a transition mode and a shutdown compensation mode, wherein the transition mode is arranged between the display compensation mode and the shutdown compensation mode in a time sequence, when the display compensation device works in the display compensation mode, the grid drive circuit outputs a grid drive signal at a first frequency, when the display compensation device works in the transition mode, the grid drive circuit outputs a grid drive signal at a second frequency so that N rows of the sensing circuits scan to the last row, the second frequency is greater than the first frequency, and N is a positive integer greater than or equal to 2.
2. The display compensation apparatus of claim 1, wherein the number of active levels in the gate drive signal is greater than N in the transition mode.
3. The display compensation apparatus of claim 2, wherein the gate driving circuit and the sensing circuit are turned off after the gate driving signal of the second frequency is swept to the nth row of the sensing circuit in the transition mode.
4. The display compensation apparatus of claim 2, wherein the gate drive circuit comprises:
a first drive sub-circuit connected to the sense circuit for providing a gate signal to the sense circuit in the display compensation mode and the transition mode;
a second drive sub-circuit connected to the sense circuit for providing a gate signal to the sense circuit in the shutdown compensation mode.
5. The display compensation apparatus of claim 4, wherein in the transition mode, the first driving sub-circuit and the sensing circuit are turned off after the gate driving signal of the second frequency is scanned to the sensing circuit of the Nth row.
6. A display compensation method for use in the display compensation apparatus of any one of claims 1 to 5, the display compensation method comprising:
receiving a shutdown compensation signal in a display compensation mode, wherein a sensing circuit receives a grid signal of a first frequency in the display compensation mode;
responding to the shutdown compensation signal to switch from a display compensation mode to a transition mode, wherein the sensing circuit receives a grid signal of a second frequency in the transition mode, and the second frequency is greater than the first frequency;
and switching the transition mode to a shutdown compensation mode to perform shutdown compensation.
7. The display compensation method of claim 6, wherein after receiving a shutdown compensation signal, the display compensation method further comprises:
and responding to the control signal to drive the display device to display at least one frame of black picture.
8. The display compensation method of claim 6, wherein the number of active levels in the gate driving signal is greater than N in the transition mode.
9. The display compensation method of claim 8, wherein in the transition mode, after the gate driving signal of the second frequency is scanned to the sensing circuit of the nth row, the gate driving circuit and the sensing circuit are disconnected.
10. A display device, characterized in that the display device comprises the display compensation device according to any one of claims 1 to 5.
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| CN108877686B (en) * | 2017-05-12 | 2020-12-08 | 京东方科技集团股份有限公司 | Data compensation method and device, display driving method and device and display device |
| CN107749280A (en) * | 2017-12-06 | 2018-03-02 | 京东方科技集团股份有限公司 | The driving method and display device of display device |
| KR102401355B1 (en) * | 2017-12-12 | 2022-05-24 | 엘지디스플레이 주식회사 | Electroluminescence display and driving method thereof |
| TWI684973B (en) * | 2019-03-04 | 2020-02-11 | 友達光電股份有限公司 | Display device |
| CN110264949B (en) * | 2019-06-26 | 2023-01-10 | 京东方科技集团股份有限公司 | Pixel unit, compensation method thereof and display device |
| KR20210012093A (en) * | 2019-07-23 | 2021-02-03 | 삼성디스플레이 주식회사 | Method for compensating degradation of display device |
| CN110428779B (en) * | 2019-08-15 | 2021-01-22 | 京东方科技集团股份有限公司 | Pixel circuit, display panel and display device |
| CN110444168A (en) * | 2019-08-15 | 2019-11-12 | 京东方科技集团股份有限公司 | Pixel circuit, display panel and display equipment |
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